diff options
Diffstat (limited to 'drivers/tty/serial')
72 files changed, 2275 insertions, 1574 deletions
diff --git a/drivers/tty/serial/8250/8250.h b/drivers/tty/serial/8250/8250.h index 1aa3e55c8b..6a7b286f6f 100644 --- a/drivers/tty/serial/8250/8250.h +++ b/drivers/tty/serial/8250/8250.h @@ -293,9 +293,6 @@ static inline int serial8250_in_MCR(struct uart_8250_port *up) return mctrl; } -bool alpha_jensen(void); -void alpha_jensen_set_mctrl(struct uart_port *port, unsigned int mctrl); - #ifdef CONFIG_SERIAL_8250_PNP int serial8250_pnp_init(void); void serial8250_pnp_exit(void); diff --git a/drivers/tty/serial/8250/8250_alpha.c b/drivers/tty/serial/8250/8250_alpha.c deleted file mode 100644 index 58e70328aa..0000000000 --- a/drivers/tty/serial/8250/8250_alpha.c +++ /dev/null @@ -1,21 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0+ - -#include <asm/machvec.h> -#include "8250.h" - -bool alpha_jensen(void) -{ - return !strcmp(alpha_mv.vector_name, "Jensen"); -} - -void alpha_jensen_set_mctrl(struct uart_port *port, unsigned int mctrl) -{ - /* - * Digital did something really horribly wrong with the OUT1 and OUT2 - * lines on Alpha Jensen. The failure mode is that if either is - * cleared, the machine locks up with endless interrupts. - */ - mctrl |= TIOCM_OUT1 | TIOCM_OUT2; - - serial8250_do_set_mctrl(port, mctrl); -} diff --git a/drivers/tty/serial/8250/8250_bcm7271.c b/drivers/tty/serial/8250/8250_bcm7271.c index 61d81b11f6..2569ca6922 100644 --- a/drivers/tty/serial/8250/8250_bcm7271.c +++ b/drivers/tty/serial/8250/8250_bcm7271.c @@ -413,20 +413,18 @@ static int stop_tx_dma(struct uart_8250_port *p) static int brcmuart_tx_dma(struct uart_8250_port *p) { struct brcmuart_priv *priv = p->port.private_data; - struct circ_buf *xmit = &p->port.state->xmit; + struct tty_port *tport = &p->port.state->port; u32 tx_size; if (uart_tx_stopped(&p->port) || priv->tx_running || - uart_circ_empty(xmit)) { + kfifo_is_empty(&tport->xmit_fifo)) { return 0; } - tx_size = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); priv->dma.tx_err = 0; - memcpy(priv->tx_buf, &xmit->buf[xmit->tail], tx_size); - uart_xmit_advance(&p->port, tx_size); + tx_size = uart_fifo_out(&p->port, priv->tx_buf, UART_XMIT_SIZE); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(&p->port); udma_writel(priv, REGS_DMA_TX, UDMA_TX_TRANSFER_LEN, tx_size); @@ -540,7 +538,7 @@ static void brcmuart_tx_isr(struct uart_port *up, u32 isr) struct brcmuart_priv *priv = up->private_data; struct device *dev = up->dev; struct uart_8250_port *port_8250 = up_to_u8250p(up); - struct circ_buf *xmit = &port_8250->port.state->xmit; + struct tty_port *tport = &port_8250->port.state->port; if (isr & UDMA_INTR_TX_ABORT) { if (priv->tx_running) @@ -548,7 +546,7 @@ static void brcmuart_tx_isr(struct uart_port *up, u32 isr) return; } priv->tx_running = false; - if (!uart_circ_empty(xmit) && !uart_tx_stopped(up)) + if (!kfifo_is_empty(&tport->xmit_fifo) && !uart_tx_stopped(up)) brcmuart_tx_dma(port_8250); } diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index b62ad90067..b0adafc447 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -280,7 +280,8 @@ static void serial8250_backup_timeout(struct timer_list *t) */ lsr = serial_lsr_in(up); if ((iir & UART_IIR_NO_INT) && (up->ier & UART_IER_THRI) && - (!uart_circ_empty(&up->port.state->xmit) || up->port.x_char) && + (!kfifo_is_empty(&up->port.state->port.xmit_fifo) || + up->port.x_char) && (lsr & UART_LSR_THRE)) { iir &= ~(UART_IIR_ID | UART_IIR_NO_INT); iir |= UART_IIR_THRI; @@ -508,10 +509,6 @@ static struct uart_8250_port *serial8250_setup_port(int index) up->ops = &univ8250_driver_ops; - if (IS_ENABLED(CONFIG_ALPHA_JENSEN) || - (IS_ENABLED(CONFIG_ALPHA_GENERIC) && alpha_jensen())) - up->port.set_mctrl = alpha_jensen_set_mctrl; - serial8250_set_defaults(up); return up; diff --git a/drivers/tty/serial/8250/8250_dma.c b/drivers/tty/serial/8250/8250_dma.c index 8b30ca8fdd..8a353e3cc3 100644 --- a/drivers/tty/serial/8250/8250_dma.c +++ b/drivers/tty/serial/8250/8250_dma.c @@ -15,7 +15,7 @@ static void __dma_tx_complete(void *param) { struct uart_8250_port *p = param; struct uart_8250_dma *dma = p->dma; - struct circ_buf *xmit = &p->port.state->xmit; + struct tty_port *tport = &p->port.state->port; unsigned long flags; int ret; @@ -28,7 +28,7 @@ static void __dma_tx_complete(void *param) uart_xmit_advance(&p->port, dma->tx_size); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(&p->port); ret = serial8250_tx_dma(p); @@ -86,9 +86,10 @@ static void dma_rx_complete(void *param) int serial8250_tx_dma(struct uart_8250_port *p) { struct uart_8250_dma *dma = p->dma; - struct circ_buf *xmit = &p->port.state->xmit; + struct tty_port *tport = &p->port.state->port; struct dma_async_tx_descriptor *desc; struct uart_port *up = &p->port; + struct scatterlist sg; int ret; if (dma->tx_running) { @@ -102,19 +103,27 @@ int serial8250_tx_dma(struct uart_8250_port *p) uart_xchar_out(up, UART_TX); } - if (uart_tx_stopped(&p->port) || uart_circ_empty(xmit)) { + if (uart_tx_stopped(&p->port) || kfifo_is_empty(&tport->xmit_fifo)) { /* We have been called from __dma_tx_complete() */ return 0; } - dma->tx_size = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); - serial8250_do_prepare_tx_dma(p); - desc = dmaengine_prep_slave_single(dma->txchan, - dma->tx_addr + xmit->tail, - dma->tx_size, DMA_MEM_TO_DEV, - DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + sg_init_table(&sg, 1); + /* kfifo can do more than one sg, we don't (quite yet) */ + ret = kfifo_dma_out_prepare_mapped(&tport->xmit_fifo, &sg, 1, + UART_XMIT_SIZE, dma->tx_addr); + + /* we already checked empty fifo above, so there should be something */ + if (WARN_ON_ONCE(ret != 1)) + return 0; + + dma->tx_size = sg_dma_len(&sg); + + desc = dmaengine_prep_slave_sg(dma->txchan, &sg, 1, + DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!desc) { ret = -EBUSY; goto err; @@ -253,7 +262,7 @@ int serial8250_request_dma(struct uart_8250_port *p) /* TX buffer */ dma->tx_addr = dma_map_single(dma->txchan->device->dev, - p->port.state->xmit.buf, + p->port.state->port.xmit_buf, UART_XMIT_SIZE, DMA_TO_DEVICE); if (dma_mapping_error(dma->txchan->device->dev, dma->tx_addr)) { diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index a58890fd53..fb809e32c6 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -128,14 +128,18 @@ static void dw8250_force_idle(struct uart_port *p) (void)p->serial_in(p, UART_RX); } -static void dw8250_check_lcr(struct uart_port *p, int value) +static void dw8250_check_lcr(struct uart_port *p, int offset, int value) { - void __iomem *offset = p->membase + (UART_LCR << p->regshift); + struct dw8250_data *d = to_dw8250_data(p->private_data); + void __iomem *addr = p->membase + (offset << p->regshift); int tries = 1000; + if (offset != UART_LCR || d->uart_16550_compatible) + return; + /* Make sure LCR write wasn't ignored */ while (tries--) { - unsigned int lcr = p->serial_in(p, UART_LCR); + unsigned int lcr = p->serial_in(p, offset); if ((value & ~UART_LCR_SPAR) == (lcr & ~UART_LCR_SPAR)) return; @@ -144,15 +148,15 @@ static void dw8250_check_lcr(struct uart_port *p, int value) #ifdef CONFIG_64BIT if (p->type == PORT_OCTEON) - __raw_writeq(value & 0xff, offset); + __raw_writeq(value & 0xff, addr); else #endif if (p->iotype == UPIO_MEM32) - writel(value, offset); + writel(value, addr); else if (p->iotype == UPIO_MEM32BE) - iowrite32be(value, offset); + iowrite32be(value, addr); else - writeb(value, offset); + writeb(value, addr); } /* * FIXME: this deadlocks if port->lock is already held @@ -186,12 +190,8 @@ static void dw8250_tx_wait_empty(struct uart_port *p) static void dw8250_serial_out(struct uart_port *p, int offset, int value) { - struct dw8250_data *d = to_dw8250_data(p->private_data); - writeb(value, p->membase + (offset << p->regshift)); - - if (offset == UART_LCR && !d->uart_16550_compatible) - dw8250_check_lcr(p, value); + dw8250_check_lcr(p, offset, value); } static void dw8250_serial_out38x(struct uart_port *p, int offset, int value) @@ -213,35 +213,26 @@ static unsigned int dw8250_serial_in(struct uart_port *p, int offset) #ifdef CONFIG_64BIT static unsigned int dw8250_serial_inq(struct uart_port *p, int offset) { - unsigned int value; - - value = (u8)__raw_readq(p->membase + (offset << p->regshift)); + u8 value = __raw_readq(p->membase + (offset << p->regshift)); return dw8250_modify_msr(p, offset, value); } static void dw8250_serial_outq(struct uart_port *p, int offset, int value) { - struct dw8250_data *d = to_dw8250_data(p->private_data); - value &= 0xff; __raw_writeq(value, p->membase + (offset << p->regshift)); /* Read back to ensure register write ordering. */ __raw_readq(p->membase + (UART_LCR << p->regshift)); - if (offset == UART_LCR && !d->uart_16550_compatible) - dw8250_check_lcr(p, value); + dw8250_check_lcr(p, offset, value); } #endif /* CONFIG_64BIT */ static void dw8250_serial_out32(struct uart_port *p, int offset, int value) { - struct dw8250_data *d = to_dw8250_data(p->private_data); - writel(value, p->membase + (offset << p->regshift)); - - if (offset == UART_LCR && !d->uart_16550_compatible) - dw8250_check_lcr(p, value); + dw8250_check_lcr(p, offset, value); } static unsigned int dw8250_serial_in32(struct uart_port *p, int offset) @@ -253,12 +244,8 @@ static unsigned int dw8250_serial_in32(struct uart_port *p, int offset) static void dw8250_serial_out32be(struct uart_port *p, int offset, int value) { - struct dw8250_data *d = to_dw8250_data(p->private_data); - iowrite32be(value, p->membase + (offset << p->regshift)); - - if (offset == UART_LCR && !d->uart_16550_compatible) - dw8250_check_lcr(p, value); + dw8250_check_lcr(p, offset, value); } static unsigned int dw8250_serial_in32be(struct uart_port *p, int offset) diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c index 4d1e07343d..616128254b 100644 --- a/drivers/tty/serial/8250/8250_exar.c +++ b/drivers/tty/serial/8250/8250_exar.c @@ -6,6 +6,7 @@ * * Copyright (C) 2017 Sudip Mukherjee, All Rights Reserved. */ +#include <linux/bitfield.h> #include <linux/bits.h> #include <linux/delay.h> #include <linux/device.h> @@ -128,12 +129,25 @@ #define UART_EXAR_DLD 0x02 /* Divisor Fractional */ #define UART_EXAR_DLD_485_POLARITY 0x80 /* RS-485 Enable Signal Polarity */ +/* EEPROM registers */ +#define UART_EXAR_REGB 0x8e +#define UART_EXAR_REGB_EECK BIT(4) +#define UART_EXAR_REGB_EECS BIT(5) +#define UART_EXAR_REGB_EEDI BIT(6) +#define UART_EXAR_REGB_EEDO BIT(7) +#define UART_EXAR_REGB_EE_ADDR_SIZE 6 +#define UART_EXAR_REGB_EE_DATA_SIZE 16 + +#define UART_EXAR_XR17C15X_PORT_OFFSET 0x200 +#define UART_EXAR_XR17V25X_PORT_OFFSET 0x200 +#define UART_EXAR_XR17V35X_PORT_OFFSET 0x400 + /* * IOT2040 MPIO wiring semantics: * * MPIO Port Function * ---- ---- -------- - * 0 2 Mode bit 0 + * 0 2 Mode bit 0 * 1 2 Mode bit 1 * 2 2 Terminate bus * 3 - <reserved> @@ -163,38 +177,300 @@ #define IOT2040_UARTS_ENABLE 0x03 #define IOT2040_UARTS_GPIO_HI_MODE 0xF8 /* enable & LED as outputs */ +/* CTI EEPROM offsets */ +#define CTI_EE_OFF_XR17C15X_OSC_FREQ 0x04 /* 2 words */ +#define CTI_EE_OFF_XR17V25X_OSC_FREQ 0x08 /* 2 words */ +#define CTI_EE_OFF_XR17C15X_PART_NUM 0x0A /* 4 words */ +#define CTI_EE_OFF_XR17V25X_PART_NUM 0x0E /* 4 words */ +#define CTI_EE_OFF_XR17C15X_SERIAL_NUM 0x0E /* 1 word */ +#define CTI_EE_OFF_XR17V25X_SERIAL_NUM 0x12 /* 1 word */ +#define CTI_EE_OFF_XR17V35X_SERIAL_NUM 0x11 /* 2 word */ +#define CTI_EE_OFF_XR17V35X_BRD_FLAGS 0x13 /* 1 word */ +#define CTI_EE_OFF_XR17V35X_PORT_FLAGS 0x14 /* 1 word */ + +#define CTI_EE_MASK_PORT_FLAGS_TYPE GENMASK(7, 0) +#define CTI_EE_MASK_OSC_FREQ_LOWER GENMASK(15, 0) +#define CTI_EE_MASK_OSC_FREQ_UPPER GENMASK(31, 16) + +#define CTI_FPGA_RS485_IO_REG 0x2008 +#define CTI_FPGA_CFG_INT_EN_REG 0x48 +#define CTI_FPGA_CFG_INT_EN_EXT_BIT BIT(15) /* External int enable bit */ + +#define CTI_DEFAULT_PCI_OSC_FREQ 29491200 +#define CTI_DEFAULT_PCIE_OSC_FREQ 125000000 +#define CTI_DEFAULT_FPGA_OSC_FREQ 33333333 + +/* + * CTI Serial port line types. These match the values stored in the first + * nibble of the CTI EEPROM port_flags word. + */ +enum cti_port_type { + CTI_PORT_TYPE_NONE = 0, + CTI_PORT_TYPE_RS232, // RS232 ONLY + CTI_PORT_TYPE_RS422_485, // RS422/RS485 ONLY + CTI_PORT_TYPE_RS232_422_485_HW, // RS232/422/485 HW ONLY Switchable + CTI_PORT_TYPE_RS232_422_485_SW, // RS232/422/485 SW ONLY Switchable + CTI_PORT_TYPE_RS232_422_485_4B, // RS232/422/485 HW/SW (4bit ex. BCG004) + CTI_PORT_TYPE_RS232_422_485_2B, // RS232/422/485 HW/SW (2bit ex. BBG008) + CTI_PORT_TYPE_MAX, +}; + +#define CTI_PORT_TYPE_VALID(_port_type) \ + (((_port_type) > CTI_PORT_TYPE_NONE) && \ + ((_port_type) < CTI_PORT_TYPE_MAX)) + +#define CTI_PORT_TYPE_RS485(_port_type) \ + (((_port_type) > CTI_PORT_TYPE_RS232) && \ + ((_port_type) < CTI_PORT_TYPE_MAX)) + struct exar8250; struct exar8250_platform { int (*rs485_config)(struct uart_port *port, struct ktermios *termios, struct serial_rs485 *rs485); const struct serial_rs485 *rs485_supported; - int (*register_gpio)(struct pci_dev *, struct uart_8250_port *); - void (*unregister_gpio)(struct uart_8250_port *); + int (*register_gpio)(struct pci_dev *pcidev, struct uart_8250_port *port); + void (*unregister_gpio)(struct uart_8250_port *port); }; /** * struct exar8250_board - board information * @num_ports: number of serial ports * @reg_shift: describes UART register mapping in PCI memory - * @setup: quirk run at ->probe() stage + * @setup: quirk run at ->probe() stage for each port * @exit: quirk run at ->remove() stage */ struct exar8250_board { unsigned int num_ports; unsigned int reg_shift; - int (*setup)(struct exar8250 *, struct pci_dev *, - struct uart_8250_port *, int); + int (*setup)(struct exar8250 *priv, struct pci_dev *pcidev, + struct uart_8250_port *port, int idx); void (*exit)(struct pci_dev *pcidev); }; struct exar8250 { unsigned int nr; + unsigned int osc_freq; struct exar8250_board *board; void __iomem *virt; int line[]; }; +static inline void exar_write_reg(struct exar8250 *priv, + unsigned int reg, u8 value) +{ + writeb(value, priv->virt + reg); +} + +static inline u8 exar_read_reg(struct exar8250 *priv, unsigned int reg) +{ + return readb(priv->virt + reg); +} + +static inline void exar_ee_select(struct exar8250 *priv) +{ + // Set chip select pin high to enable EEPROM reads/writes + exar_write_reg(priv, UART_EXAR_REGB, UART_EXAR_REGB_EECS); + // Min ~500ns delay needed between CS assert and EEPROM access + udelay(1); +} + +static inline void exar_ee_deselect(struct exar8250 *priv) +{ + exar_write_reg(priv, UART_EXAR_REGB, 0x00); +} + +static inline void exar_ee_write_bit(struct exar8250 *priv, u8 bit) +{ + u8 value = UART_EXAR_REGB_EECS; + + if (bit) + value |= UART_EXAR_REGB_EEDI; + + // Clock out the bit on the EEPROM interface + exar_write_reg(priv, UART_EXAR_REGB, value); + // 2us delay = ~500khz clock speed + udelay(2); + + value |= UART_EXAR_REGB_EECK; + + exar_write_reg(priv, UART_EXAR_REGB, value); + udelay(2); +} + +static inline u8 exar_ee_read_bit(struct exar8250 *priv) +{ + u8 regb; + u8 value = UART_EXAR_REGB_EECS; + + // Clock in the bit on the EEPROM interface + exar_write_reg(priv, UART_EXAR_REGB, value); + // 2us delay = ~500khz clock speed + udelay(2); + + value |= UART_EXAR_REGB_EECK; + + exar_write_reg(priv, UART_EXAR_REGB, value); + udelay(2); + + regb = exar_read_reg(priv, UART_EXAR_REGB); + + return (regb & UART_EXAR_REGB_EEDO ? 1 : 0); +} + +/** + * exar_ee_read() - Read a word from the EEPROM + * @priv: Device's private structure + * @ee_addr: Offset of EEPROM to read word from + * + * Read a single 16bit word from an Exar UART's EEPROM. + * The type of the EEPROM is AT93C46D. + * + * Return: EEPROM word + */ +static u16 exar_ee_read(struct exar8250 *priv, u8 ee_addr) +{ + int i; + u16 data = 0; + + exar_ee_select(priv); + + // Send read command (opcode 110) + exar_ee_write_bit(priv, 1); + exar_ee_write_bit(priv, 1); + exar_ee_write_bit(priv, 0); + + // Send address to read from + for (i = UART_EXAR_REGB_EE_ADDR_SIZE - 1; i >= 0; i--) + exar_ee_write_bit(priv, ee_addr & BIT(i)); + + // Read data 1 bit at a time starting with a dummy bit + for (i = UART_EXAR_REGB_EE_DATA_SIZE; i >= 0; i--) { + if (exar_ee_read_bit(priv)) + data |= BIT(i); + } + + exar_ee_deselect(priv); + + return data; +} + +/** + * exar_mpio_config_output() - Configure an Exar MPIO as an output + * @priv: Device's private structure + * @mpio_num: MPIO number/offset to configure + * + * Configure a single MPIO as an output and disable tristate. It is reccomended + * to set the level with exar_mpio_set_high()/exar_mpio_set_low() prior to + * calling this function to ensure default MPIO pin state. + * + * Return: 0 on success, negative error code on failure + */ +static int exar_mpio_config_output(struct exar8250 *priv, + unsigned int mpio_num) +{ + unsigned int mpio_offset; + u8 sel_reg; // MPIO Select register (input/output) + u8 tri_reg; // MPIO Tristate register + u8 value; + + if (mpio_num < 8) { + sel_reg = UART_EXAR_MPIOSEL_7_0; + tri_reg = UART_EXAR_MPIO3T_7_0; + mpio_offset = mpio_num; + } else if (mpio_num >= 8 && mpio_num < 16) { + sel_reg = UART_EXAR_MPIOSEL_15_8; + tri_reg = UART_EXAR_MPIO3T_15_8; + mpio_offset = mpio_num - 8; + } else { + return -EINVAL; + } + + // Disable MPIO pin tri-state + value = exar_read_reg(priv, tri_reg); + value &= ~BIT(mpio_offset); + exar_write_reg(priv, tri_reg, value); + + value = exar_read_reg(priv, sel_reg); + value &= ~BIT(mpio_offset); + exar_write_reg(priv, sel_reg, value); + + return 0; +} + +/** + * _exar_mpio_set() - Set an Exar MPIO output high or low + * @priv: Device's private structure + * @mpio_num: MPIO number/offset to set + * @high: Set MPIO high if true, low if false + * + * Set a single MPIO high or low. exar_mpio_config_output() must also be called + * to configure the pin as an output. + * + * Return: 0 on success, negative error code on failure + */ +static int _exar_mpio_set(struct exar8250 *priv, + unsigned int mpio_num, bool high) +{ + unsigned int mpio_offset; + u8 lvl_reg; + u8 value; + + if (mpio_num < 8) { + lvl_reg = UART_EXAR_MPIOLVL_7_0; + mpio_offset = mpio_num; + } else if (mpio_num >= 8 && mpio_num < 16) { + lvl_reg = UART_EXAR_MPIOLVL_15_8; + mpio_offset = mpio_num - 8; + } else { + return -EINVAL; + } + + value = exar_read_reg(priv, lvl_reg); + if (high) + value |= BIT(mpio_offset); + else + value &= ~BIT(mpio_offset); + exar_write_reg(priv, lvl_reg, value); + + return 0; +} + +static int exar_mpio_set_low(struct exar8250 *priv, unsigned int mpio_num) +{ + return _exar_mpio_set(priv, mpio_num, false); +} + +static int exar_mpio_set_high(struct exar8250 *priv, unsigned int mpio_num) +{ + return _exar_mpio_set(priv, mpio_num, true); +} + +static int generic_rs485_config(struct uart_port *port, struct ktermios *termios, + struct serial_rs485 *rs485) +{ + bool is_rs485 = !!(rs485->flags & SER_RS485_ENABLED); + u8 __iomem *p = port->membase; + u8 value; + + value = readb(p + UART_EXAR_FCTR); + if (is_rs485) + value |= UART_FCTR_EXAR_485; + else + value &= ~UART_FCTR_EXAR_485; + + writeb(value, p + UART_EXAR_FCTR); + + if (is_rs485) + writeb(UART_EXAR_RS485_DLY(4), p + UART_MSR); + + return 0; +} + +static const struct serial_rs485 generic_rs485_supported = { + .flags = SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND, +}; + static void exar_pm(struct uart_port *port, unsigned int state, unsigned int old) { /* @@ -256,7 +532,7 @@ static void exar_shutdown(struct uart_port *port) { bool tx_complete = false; struct uart_8250_port *up = up_to_u8250p(port); - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; int i = 0; u16 lsr; @@ -267,7 +543,8 @@ static void exar_shutdown(struct uart_port *port) else tx_complete = false; usleep_range(1000, 1100); - } while (!uart_circ_empty(xmit) && !tx_complete && i++ < 1000); + } while (!kfifo_is_empty(&tport->xmit_fifo) && + !tx_complete && i++ < 1000); serial8250_do_shutdown(port); } @@ -331,41 +608,546 @@ pci_fastcom335_setup(struct exar8250 *priv, struct pci_dev *pcidev, writeb(32, p + UART_EXAR_TXTRG); writeb(32, p + UART_EXAR_RXTRG); + /* Skip the initial (per device) setup */ + if (idx) + return 0; + /* * Setup Multipurpose Input/Output pins. */ + switch (pcidev->device) { + case PCI_DEVICE_ID_COMMTECH_4222PCI335: + case PCI_DEVICE_ID_COMMTECH_4224PCI335: + writeb(0x78, p + UART_EXAR_MPIOLVL_7_0); + writeb(0x00, p + UART_EXAR_MPIOINV_7_0); + writeb(0x00, p + UART_EXAR_MPIOSEL_7_0); + break; + case PCI_DEVICE_ID_COMMTECH_2324PCI335: + case PCI_DEVICE_ID_COMMTECH_2328PCI335: + writeb(0x00, p + UART_EXAR_MPIOLVL_7_0); + writeb(0xc0, p + UART_EXAR_MPIOINV_7_0); + writeb(0xc0, p + UART_EXAR_MPIOSEL_7_0); + break; + default: + break; + } + writeb(0x00, p + UART_EXAR_MPIOINT_7_0); + writeb(0x00, p + UART_EXAR_MPIO3T_7_0); + writeb(0x00, p + UART_EXAR_MPIOOD_7_0); + + return 0; +} + +/** + * cti_tristate_disable() - Disable RS485 transciever tristate + * @priv: Device's private structure + * @port_num: Port number to set tristate off + * + * Most RS485 capable cards have a power on tristate jumper/switch that ensures + * the RS422/RS485 transceiver does not drive a multi-drop RS485 bus when it is + * not the master. When this jumper is installed the user must set the RS485 + * mode to Full or Half duplex to disable tristate prior to using the port. + * + * Some Exar UARTs have an auto-tristate feature while others require setting + * an MPIO to disable the tristate. + * + * Return: 0 on success, negative error code on failure + */ +static int cti_tristate_disable(struct exar8250 *priv, unsigned int port_num) +{ + int ret; + + ret = exar_mpio_set_high(priv, port_num); + if (ret) + return ret; + + return exar_mpio_config_output(priv, port_num); +} + +/** + * cti_plx_int_enable() - Enable UART interrupts to PLX bridge + * @priv: Device's private structure + * + * Some older CTI cards require MPIO_0 to be set low to enable the + * interrupts from the UART to the PLX PCI->PCIe bridge. + * + * Return: 0 on success, negative error code on failure + */ +static int cti_plx_int_enable(struct exar8250 *priv) +{ + int ret; + + ret = exar_mpio_set_low(priv, 0); + if (ret) + return ret; + + return exar_mpio_config_output(priv, 0); +} + +/** + * cti_read_osc_freq() - Read the UART oscillator frequency from EEPROM + * @priv: Device's private structure + * @eeprom_offset: Offset where the oscillator frequency is stored + * + * CTI XR17x15X and XR17V25X cards have the serial boards oscillator frequency + * stored in the EEPROM. FPGA and XR17V35X based cards use the PCI/PCIe clock. + * + * Return: frequency on success, negative error code on failure + */ +static int cti_read_osc_freq(struct exar8250 *priv, u8 eeprom_offset) +{ + u16 lower_word; + u16 upper_word; + + lower_word = exar_ee_read(priv, eeprom_offset); + // Check if EEPROM word was blank + if (lower_word == 0xFFFF) + return -EIO; + + upper_word = exar_ee_read(priv, (eeprom_offset + 1)); + if (upper_word == 0xFFFF) + return -EIO; + + return FIELD_PREP(CTI_EE_MASK_OSC_FREQ_LOWER, lower_word) | + FIELD_PREP(CTI_EE_MASK_OSC_FREQ_UPPER, upper_word); +} + +/** + * cti_get_port_type_xr17c15x_xr17v25x() - Get port type of xr17c15x/xr17v25x + * @priv: Device's private structure + * @pcidev: Pointer to the PCI device for this port + * @port_num: Port to get type of + * + * CTI xr17c15x and xr17v25x based cards port types are based on PCI IDs. + * + * Return: port type on success, CTI_PORT_TYPE_NONE on failure + */ +static enum cti_port_type cti_get_port_type_xr17c15x_xr17v25x(struct exar8250 *priv, + struct pci_dev *pcidev, + unsigned int port_num) +{ + switch (pcidev->subsystem_device) { + // RS232 only cards + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_232: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_232: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_232: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP_232: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP_232_NS: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP_232: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP_232_NS: + return CTI_PORT_TYPE_RS232; + // 1x RS232, 1x RS422/RS485 + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_1_1: + return (port_num == 0) ? CTI_PORT_TYPE_RS232 : CTI_PORT_TYPE_RS422_485; + // 2x RS232, 2x RS422/RS485 + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_2: + return (port_num < 2) ? CTI_PORT_TYPE_RS232 : CTI_PORT_TYPE_RS422_485; + // 4x RS232, 4x RS422/RS485 + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4_SP: + return (port_num < 4) ? CTI_PORT_TYPE_RS232 : CTI_PORT_TYPE_RS422_485; + // RS232/RS422/RS485 HW (jumper) selectable + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_SP_OPTO: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_SP_OPTO_A: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_SP_OPTO_B: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XPRS: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_A: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_B: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_16_XPRS_A: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_16_XPRS_B: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XPRS_OPTO: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_OPTO_A: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_OPTO_B: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XP_OPTO_LEFT: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XP_OPTO_RIGHT: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XP_OPTO: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4_XPRS_OPTO: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP: + return CTI_PORT_TYPE_RS232_422_485_HW; + // RS422/RS485 HW (jumper) selectable + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_485: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_485: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_485: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP_485: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP_485: + return CTI_PORT_TYPE_RS422_485; + // 6x RS232, 2x RS422/RS485 + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_6_2_SP: + return (port_num < 6) ? CTI_PORT_TYPE_RS232 : CTI_PORT_TYPE_RS422_485; + // 2x RS232, 6x RS422/RS485 + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_6_SP: + return (port_num < 2) ? CTI_PORT_TYPE_RS232 : CTI_PORT_TYPE_RS422_485; + default: + dev_err(&pcidev->dev, "unknown/unsupported device\n"); + return CTI_PORT_TYPE_NONE; + } +} + +/** + * cti_get_port_type_fpga() - Get the port type of a CTI FPGA card + * @priv: Device's private structure + * @pcidev: Pointer to the PCI device for this port + * @port_num: Port to get type of + * + * FPGA based cards port types are based on PCI IDs. + * + * Return: port type on success, CTI_PORT_TYPE_NONE on failure + */ +static enum cti_port_type cti_get_port_type_fpga(struct exar8250 *priv, + struct pci_dev *pcidev, + unsigned int port_num) +{ + switch (pcidev->device) { + case PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_12_XIG00X: + case PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_12_XIG01X: + case PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_16: + return CTI_PORT_TYPE_RS232_422_485_HW; + default: + dev_err(&pcidev->dev, "unknown/unsupported device\n"); + return CTI_PORT_TYPE_NONE; + } +} + +/** + * cti_get_port_type_xr17v35x() - Read port type from the EEPROM + * @priv: Device's private structure + * @pcidev: Pointer to the PCI device for this port + * @port_num: port offset + * + * CTI XR17V35X based cards have the port types stored in the EEPROM. + * This function reads the port type for a single port. + * + * Return: port type on success, CTI_PORT_TYPE_NONE on failure + */ +static enum cti_port_type cti_get_port_type_xr17v35x(struct exar8250 *priv, + struct pci_dev *pcidev, + unsigned int port_num) +{ + enum cti_port_type port_type; + u16 port_flags; + u8 offset; + + offset = CTI_EE_OFF_XR17V35X_PORT_FLAGS + port_num; + port_flags = exar_ee_read(priv, offset); + + port_type = FIELD_GET(CTI_EE_MASK_PORT_FLAGS_TYPE, port_flags); + if (CTI_PORT_TYPE_VALID(port_type)) + return port_type; + + /* + * If the port type is missing the card assume it is a + * RS232/RS422/RS485 card to be safe. + * + * There is one known board (BEG013) that only has 3 of 4 port types + * written to the EEPROM so this acts as a work around. + */ + dev_warn(&pcidev->dev, "failed to get port %d type from EEPROM\n", port_num); + + return CTI_PORT_TYPE_RS232_422_485_HW; +} + +static int cti_rs485_config_mpio_tristate(struct uart_port *port, + struct ktermios *termios, + struct serial_rs485 *rs485) +{ + struct exar8250 *priv = (struct exar8250 *)port->private_data; + int ret; + + ret = generic_rs485_config(port, termios, rs485); + if (ret) + return ret; + + // Disable power-on RS485 tri-state via MPIO + return cti_tristate_disable(priv, port->port_id); +} + +static void cti_board_init_osc_freq(struct exar8250 *priv, struct pci_dev *pcidev, u8 eeprom_offset) +{ + int osc_freq; + + osc_freq = cti_read_osc_freq(priv, eeprom_offset); + if (osc_freq <= 0) { + dev_warn(&pcidev->dev, "failed to read OSC freq from EEPROM, using default\n"); + osc_freq = CTI_DEFAULT_PCI_OSC_FREQ; + } + + priv->osc_freq = osc_freq; +} + +static int cti_port_setup_common(struct exar8250 *priv, + struct pci_dev *pcidev, + int idx, unsigned int offset, + struct uart_8250_port *port) +{ + int ret; + + port->port.port_id = idx; + port->port.uartclk = priv->osc_freq; + + ret = serial8250_pci_setup_port(pcidev, port, 0, offset, 0); + if (ret) + return ret; + + port->port.private_data = (void *)priv; + port->port.pm = exar_pm; + port->port.shutdown = exar_shutdown; + + return 0; +} + +static int cti_board_init_fpga(struct exar8250 *priv, struct pci_dev *pcidev) +{ + int ret; + u16 cfg_val; + + // FPGA OSC is fixed to the 33MHz PCI clock + priv->osc_freq = CTI_DEFAULT_FPGA_OSC_FREQ; + + // Enable external interrupts in special cfg space register + ret = pci_read_config_word(pcidev, CTI_FPGA_CFG_INT_EN_REG, &cfg_val); + if (ret) + return pcibios_err_to_errno(ret); + + cfg_val |= CTI_FPGA_CFG_INT_EN_EXT_BIT; + ret = pci_write_config_word(pcidev, CTI_FPGA_CFG_INT_EN_REG, cfg_val); + if (ret) + return pcibios_err_to_errno(ret); + + // RS485 gate needs to be enabled; otherwise RTS/CTS will not work + exar_write_reg(priv, CTI_FPGA_RS485_IO_REG, 0x01); + + return 0; +} + +static int cti_port_setup_fpga(struct exar8250 *priv, + struct pci_dev *pcidev, + struct uart_8250_port *port, + int idx) +{ + enum cti_port_type port_type; + unsigned int offset; + int ret; + if (idx == 0) { - switch (pcidev->device) { - case PCI_DEVICE_ID_COMMTECH_4222PCI335: - case PCI_DEVICE_ID_COMMTECH_4224PCI335: - writeb(0x78, p + UART_EXAR_MPIOLVL_7_0); - writeb(0x00, p + UART_EXAR_MPIOINV_7_0); - writeb(0x00, p + UART_EXAR_MPIOSEL_7_0); + ret = cti_board_init_fpga(priv, pcidev); + if (ret) + return ret; + } + + port_type = cti_get_port_type_fpga(priv, pcidev, idx); + + // FPGA shares port offsets with XR17C15X + offset = idx * UART_EXAR_XR17C15X_PORT_OFFSET; + port->port.type = PORT_XR17D15X; + + port->port.get_divisor = xr17v35x_get_divisor; + port->port.set_divisor = xr17v35x_set_divisor; + port->port.startup = xr17v35x_startup; + + if (CTI_PORT_TYPE_RS485(port_type)) { + port->port.rs485_config = generic_rs485_config; + port->port.rs485_supported = generic_rs485_supported; + } + + return cti_port_setup_common(priv, pcidev, idx, offset, port); +} + +static void cti_board_init_xr17v35x(struct exar8250 *priv, struct pci_dev *pcidev) +{ + // XR17V35X uses the PCIe clock rather than an oscillator + priv->osc_freq = CTI_DEFAULT_PCIE_OSC_FREQ; +} + +static int cti_port_setup_xr17v35x(struct exar8250 *priv, + struct pci_dev *pcidev, + struct uart_8250_port *port, + int idx) +{ + enum cti_port_type port_type; + unsigned int offset; + int ret; + + if (idx == 0) + cti_board_init_xr17v35x(priv, pcidev); + + port_type = cti_get_port_type_xr17v35x(priv, pcidev, idx); + + offset = idx * UART_EXAR_XR17V35X_PORT_OFFSET; + port->port.type = PORT_XR17V35X; + + port->port.get_divisor = xr17v35x_get_divisor; + port->port.set_divisor = xr17v35x_set_divisor; + port->port.startup = xr17v35x_startup; + + switch (port_type) { + case CTI_PORT_TYPE_RS422_485: + case CTI_PORT_TYPE_RS232_422_485_HW: + port->port.rs485_config = cti_rs485_config_mpio_tristate; + port->port.rs485_supported = generic_rs485_supported; + break; + case CTI_PORT_TYPE_RS232_422_485_SW: + case CTI_PORT_TYPE_RS232_422_485_4B: + case CTI_PORT_TYPE_RS232_422_485_2B: + port->port.rs485_config = generic_rs485_config; + port->port.rs485_supported = generic_rs485_supported; + break; + default: + break; + } + + ret = cti_port_setup_common(priv, pcidev, idx, offset, port); + if (ret) + return ret; + + exar_write_reg(priv, (offset + UART_EXAR_8XMODE), 0x00); + exar_write_reg(priv, (offset + UART_EXAR_FCTR), UART_FCTR_EXAR_TRGD); + exar_write_reg(priv, (offset + UART_EXAR_TXTRG), 128); + exar_write_reg(priv, (offset + UART_EXAR_RXTRG), 128); + + return 0; +} + +static void cti_board_init_xr17v25x(struct exar8250 *priv, struct pci_dev *pcidev) +{ + cti_board_init_osc_freq(priv, pcidev, CTI_EE_OFF_XR17V25X_OSC_FREQ); + + /* enable interrupts on cards that need the "PLX fix" */ + switch (pcidev->subsystem_device) { + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_16_XPRS_A: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_16_XPRS_B: + cti_plx_int_enable(priv); + break; + default: + break; + } +} + +static int cti_port_setup_xr17v25x(struct exar8250 *priv, + struct pci_dev *pcidev, + struct uart_8250_port *port, + int idx) +{ + enum cti_port_type port_type; + unsigned int offset; + int ret; + + if (idx == 0) + cti_board_init_xr17v25x(priv, pcidev); + + port_type = cti_get_port_type_xr17c15x_xr17v25x(priv, pcidev, idx); + + offset = idx * UART_EXAR_XR17V25X_PORT_OFFSET; + port->port.type = PORT_XR17D15X; + + // XR17V25X supports fractional baudrates + port->port.get_divisor = xr17v35x_get_divisor; + port->port.set_divisor = xr17v35x_set_divisor; + port->port.startup = xr17v35x_startup; + + if (CTI_PORT_TYPE_RS485(port_type)) { + switch (pcidev->subsystem_device) { + // These cards support power on 485 tri-state via MPIO + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP_485: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4_SP: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_6_2_SP: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_6_SP: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XP_OPTO_LEFT: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XP_OPTO_RIGHT: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XP_OPTO: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4_XPRS_OPTO: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP_485: + port->port.rs485_config = cti_rs485_config_mpio_tristate; break; - case PCI_DEVICE_ID_COMMTECH_2324PCI335: - case PCI_DEVICE_ID_COMMTECH_2328PCI335: - writeb(0x00, p + UART_EXAR_MPIOLVL_7_0); - writeb(0xc0, p + UART_EXAR_MPIOINV_7_0); - writeb(0xc0, p + UART_EXAR_MPIOSEL_7_0); + // Otherwise auto or no power on 485 tri-state support + default: + port->port.rs485_config = generic_rs485_config; break; } - writeb(0x00, p + UART_EXAR_MPIOINT_7_0); - writeb(0x00, p + UART_EXAR_MPIO3T_7_0); - writeb(0x00, p + UART_EXAR_MPIOOD_7_0); + + port->port.rs485_supported = generic_rs485_supported; } + ret = cti_port_setup_common(priv, pcidev, idx, offset, port); + if (ret) + return ret; + + exar_write_reg(priv, (offset + UART_EXAR_8XMODE), 0x00); + exar_write_reg(priv, (offset + UART_EXAR_FCTR), UART_FCTR_EXAR_TRGD); + exar_write_reg(priv, (offset + UART_EXAR_TXTRG), 32); + exar_write_reg(priv, (offset + UART_EXAR_RXTRG), 32); + return 0; } -static int -pci_connect_tech_setup(struct exar8250 *priv, struct pci_dev *pcidev, - struct uart_8250_port *port, int idx) +static void cti_board_init_xr17c15x(struct exar8250 *priv, struct pci_dev *pcidev) { - unsigned int offset = idx * 0x200; - unsigned int baud = 1843200; + cti_board_init_osc_freq(priv, pcidev, CTI_EE_OFF_XR17C15X_OSC_FREQ); + + /* enable interrupts on cards that need the "PLX fix" */ + switch (pcidev->subsystem_device) { + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XPRS: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_A: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_B: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XPRS_OPTO: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_OPTO_A: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_OPTO_B: + cti_plx_int_enable(priv); + break; + default: + break; + } +} - port->port.uartclk = baud * 16; - return default_setup(priv, pcidev, idx, offset, port); +static int cti_port_setup_xr17c15x(struct exar8250 *priv, + struct pci_dev *pcidev, + struct uart_8250_port *port, + int idx) +{ + enum cti_port_type port_type; + unsigned int offset; + + if (idx == 0) + cti_board_init_xr17c15x(priv, pcidev); + + port_type = cti_get_port_type_xr17c15x_xr17v25x(priv, pcidev, idx); + + offset = idx * UART_EXAR_XR17C15X_PORT_OFFSET; + port->port.type = PORT_XR17D15X; + + if (CTI_PORT_TYPE_RS485(port_type)) { + switch (pcidev->subsystem_device) { + // These cards support power on 485 tri-state via MPIO + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP_485: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4_SP: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_6_2_SP: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_6_SP: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XP_OPTO_LEFT: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XP_OPTO_RIGHT: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XP_OPTO: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4_XPRS_OPTO: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP: + case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP_485: + port->port.rs485_config = cti_rs485_config_mpio_tristate; + break; + // Otherwise auto or no power on 485 tri-state support + default: + port->port.rs485_config = generic_rs485_config; + break; + } + + port->port.rs485_supported = generic_rs485_supported; + } + + return cti_port_setup_common(priv, pcidev, idx, offset, port); } static int @@ -386,11 +1168,10 @@ static void setup_gpio(struct pci_dev *pcidev, u8 __iomem *p) * devices will export them as GPIOs, so we pre-configure them safely * as inputs. */ - u8 dir = 0x00; if ((pcidev->vendor == PCI_VENDOR_ID_EXAR) && - (pcidev->subsystem_vendor != PCI_VENDOR_ID_SEALEVEL)) { + (pcidev->subsystem_vendor != PCI_VENDOR_ID_SEALEVEL)) { // Configure GPIO as inputs for Commtech adapters dir = 0xff; } else { @@ -467,27 +1248,6 @@ static void xr17v35x_unregister_gpio(struct uart_8250_port *port) port->port.private_data = NULL; } -static int generic_rs485_config(struct uart_port *port, struct ktermios *termios, - struct serial_rs485 *rs485) -{ - bool is_rs485 = !!(rs485->flags & SER_RS485_ENABLED); - u8 __iomem *p = port->membase; - u8 value; - - value = readb(p + UART_EXAR_FCTR); - if (is_rs485) - value |= UART_FCTR_EXAR_485; - else - value &= ~UART_FCTR_EXAR_485; - - writeb(value, p + UART_EXAR_FCTR); - - if (is_rs485) - writeb(UART_EXAR_RS485_DLY(4), p + UART_MSR); - - return 0; -} - static int sealevel_rs485_config(struct uart_port *port, struct ktermios *termios, struct serial_rs485 *rs485) { @@ -501,35 +1261,32 @@ static int sealevel_rs485_config(struct uart_port *port, struct ktermios *termio if (ret) return ret; - if (rs485->flags & SER_RS485_ENABLED) { - old_lcr = readb(p + UART_LCR); + if (!(rs485->flags & SER_RS485_ENABLED)) + return 0; - /* Set EFR[4]=1 to enable enhanced feature registers */ - efr = readb(p + UART_XR_EFR); - efr |= UART_EFR_ECB; - writeb(efr, p + UART_XR_EFR); + old_lcr = readb(p + UART_LCR); - /* Set MCR to use DTR as Auto-RS485 Enable signal */ - writeb(UART_MCR_OUT1, p + UART_MCR); + /* Set EFR[4]=1 to enable enhanced feature registers */ + efr = readb(p + UART_XR_EFR); + efr |= UART_EFR_ECB; + writeb(efr, p + UART_XR_EFR); - /* Set LCR[7]=1 to enable access to DLD register */ - writeb(old_lcr | UART_LCR_DLAB, p + UART_LCR); + /* Set MCR to use DTR as Auto-RS485 Enable signal */ + writeb(UART_MCR_OUT1, p + UART_MCR); - /* Set DLD[7]=1 for inverted RS485 Enable logic */ - dld = readb(p + UART_EXAR_DLD); - dld |= UART_EXAR_DLD_485_POLARITY; - writeb(dld, p + UART_EXAR_DLD); + /* Set LCR[7]=1 to enable access to DLD register */ + writeb(old_lcr | UART_LCR_DLAB, p + UART_LCR); - writeb(old_lcr, p + UART_LCR); - } + /* Set DLD[7]=1 for inverted RS485 Enable logic */ + dld = readb(p + UART_EXAR_DLD); + dld |= UART_EXAR_DLD_485_POLARITY; + writeb(dld, p + UART_EXAR_DLD); + + writeb(old_lcr, p + UART_LCR); return 0; } -static const struct serial_rs485 generic_rs485_supported = { - .flags = SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND, -}; - static const struct exar8250_platform exar8250_default_platform = { .register_gpio = xr17v35x_register_gpio, .unregister_gpio = xr17v35x_unregister_gpio, @@ -714,6 +1471,35 @@ static irqreturn_t exar_misc_handler(int irq, void *data) return IRQ_HANDLED; } +static unsigned int exar_get_nr_ports(struct exar8250_board *board, struct pci_dev *pcidev) +{ + if (pcidev->vendor == PCI_VENDOR_ID_ACCESSIO) + return BIT(((pcidev->device & 0x38) >> 3) - 1); + + // Check if board struct overrides number of ports + if (board->num_ports > 0) + return board->num_ports; + + // Exar encodes # ports in last nibble of PCI Device ID ex. 0358 + if (pcidev->vendor == PCI_VENDOR_ID_EXAR) + return pcidev->device & 0x0f; + + // Handle CTI FPGA cards + if (pcidev->vendor == PCI_VENDOR_ID_CONNECT_TECH) { + switch (pcidev->device) { + case PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_12_XIG00X: + case PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_12_XIG01X: + return 12; + case PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_16: + return 16; + default: + return 0; + } + } + + return 0; +} + static int exar_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *ent) { @@ -733,12 +1519,9 @@ exar_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *ent) maxnr = pci_resource_len(pcidev, bar) >> (board->reg_shift + 3); - if (pcidev->vendor == PCI_VENDOR_ID_ACCESSIO) - nr_ports = BIT(((pcidev->device & 0x38) >> 3) - 1); - else if (board->num_ports) - nr_ports = board->num_ports; - else - nr_ports = pcidev->device & 0x0f; + nr_ports = exar_get_nr_ports(board, pcidev); + if (nr_ports == 0) + return dev_err_probe(&pcidev->dev, -ENODEV, "failed to get number of ports\n"); priv = devm_kzalloc(&pcidev->dev, struct_size(priv, line, nr_ports), GFP_KERNEL); if (!priv) @@ -771,7 +1554,7 @@ exar_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *ent) for (i = 0; i < nr_ports && i < maxnr; i++) { rc = board->setup(priv, pcidev, &uart, i); if (rc) { - dev_err(&pcidev->dev, "Failed to setup port %u\n", i); + dev_err_probe(&pcidev->dev, rc, "Failed to setup port %u\n", i); break; } @@ -780,10 +1563,9 @@ exar_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *ent) priv->line[i] = serial8250_register_8250_port(&uart); if (priv->line[i] < 0) { - dev_err(&pcidev->dev, - "Couldn't register serial port %lx, irq %d, type %d, error %d\n", - uart.port.iobase, uart.port.irq, - uart.port.iotype, priv->line[i]); + dev_err_probe(&pcidev->dev, priv->line[i], + "Couldn't register serial port %lx, type %d, irq %d\n", + uart.port.iobase, uart.port.iotype, uart.port.irq); break; } } @@ -848,8 +1630,20 @@ static const struct exar8250_board pbn_fastcom335_8 = { .setup = pci_fastcom335_setup, }; -static const struct exar8250_board pbn_connect = { - .setup = pci_connect_tech_setup, +static const struct exar8250_board pbn_cti_xr17c15x = { + .setup = cti_port_setup_xr17c15x, +}; + +static const struct exar8250_board pbn_cti_xr17v25x = { + .setup = cti_port_setup_xr17v25x, +}; + +static const struct exar8250_board pbn_cti_xr17v35x = { + .setup = cti_port_setup_xr17v35x, +}; + +static const struct exar8250_board pbn_cti_fpga = { + .setup = cti_port_setup_fpga, }; static const struct exar8250_board pbn_exar_ibm_saturn = { @@ -896,13 +1690,13 @@ static const struct exar8250_board pbn_exar_XR17V8358 = { .exit = pci_xr17v35x_exit, }; -#define CONNECT_DEVICE(devid, sdevid, bd) { \ - PCI_DEVICE_SUB( \ - PCI_VENDOR_ID_EXAR, \ - PCI_DEVICE_ID_EXAR_##devid, \ - PCI_SUBVENDOR_ID_CONNECT_TECH, \ - PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_##sdevid), 0, 0, \ - (kernel_ulong_t)&bd \ +#define CTI_EXAR_DEVICE(devid, bd) { \ + PCI_DEVICE_SUB( \ + PCI_VENDOR_ID_EXAR, \ + PCI_DEVICE_ID_EXAR_##devid, \ + PCI_SUBVENDOR_ID_CONNECT_TECH, \ + PCI_ANY_ID), 0, 0, \ + (kernel_ulong_t)&bd \ } #define EXAR_DEVICE(vend, devid, bd) { PCI_DEVICE_DATA(vend, devid, &bd) } @@ -911,7 +1705,7 @@ static const struct exar8250_board pbn_exar_XR17V8358 = { PCI_DEVICE_SUB( \ PCI_VENDOR_ID_EXAR, \ PCI_DEVICE_ID_EXAR_##devid, \ - PCI_VENDOR_ID_IBM, \ + PCI_SUBVENDOR_ID_IBM, \ PCI_SUBDEVICE_ID_IBM_##sdevid), 0, 0, \ (kernel_ulong_t)&bd \ } @@ -934,18 +1728,23 @@ static const struct pci_device_id exar_pci_tbl[] = { EXAR_DEVICE(ACCESSIO, COM_4SM, pbn_exar_XR17C15x), EXAR_DEVICE(ACCESSIO, COM_8SM, pbn_exar_XR17C15x), - CONNECT_DEVICE(XR17C152, UART_2_232, pbn_connect), - CONNECT_DEVICE(XR17C154, UART_4_232, pbn_connect), - CONNECT_DEVICE(XR17C158, UART_8_232, pbn_connect), - CONNECT_DEVICE(XR17C152, UART_1_1, pbn_connect), - CONNECT_DEVICE(XR17C154, UART_2_2, pbn_connect), - CONNECT_DEVICE(XR17C158, UART_4_4, pbn_connect), - CONNECT_DEVICE(XR17C152, UART_2, pbn_connect), - CONNECT_DEVICE(XR17C154, UART_4, pbn_connect), - CONNECT_DEVICE(XR17C158, UART_8, pbn_connect), - CONNECT_DEVICE(XR17C152, UART_2_485, pbn_connect), - CONNECT_DEVICE(XR17C154, UART_4_485, pbn_connect), - CONNECT_DEVICE(XR17C158, UART_8_485, pbn_connect), + /* Connect Tech cards with Exar vendor/device PCI IDs */ + CTI_EXAR_DEVICE(XR17C152, pbn_cti_xr17c15x), + CTI_EXAR_DEVICE(XR17C154, pbn_cti_xr17c15x), + CTI_EXAR_DEVICE(XR17C158, pbn_cti_xr17c15x), + + CTI_EXAR_DEVICE(XR17V252, pbn_cti_xr17v25x), + CTI_EXAR_DEVICE(XR17V254, pbn_cti_xr17v25x), + CTI_EXAR_DEVICE(XR17V258, pbn_cti_xr17v25x), + + CTI_EXAR_DEVICE(XR17V352, pbn_cti_xr17v35x), + CTI_EXAR_DEVICE(XR17V354, pbn_cti_xr17v35x), + CTI_EXAR_DEVICE(XR17V358, pbn_cti_xr17v35x), + + /* Connect Tech cards with Connect Tech vendor/device PCI IDs (FPGA based) */ + EXAR_DEVICE(CONNECT_TECH, PCI_XR79X_12_XIG00X, pbn_cti_fpga), + EXAR_DEVICE(CONNECT_TECH, PCI_XR79X_12_XIG01X, pbn_cti_fpga), + EXAR_DEVICE(CONNECT_TECH, PCI_XR79X_16, pbn_cti_fpga), IBM_DEVICE(XR17C152, SATURN_SERIAL_ONE_PORT, pbn_exar_ibm_saturn), diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c index d14988d149..b9cca210e1 100644 --- a/drivers/tty/serial/8250/8250_mtk.c +++ b/drivers/tty/serial/8250/8250_mtk.c @@ -199,7 +199,7 @@ static int mtk8250_startup(struct uart_port *port) if (up->dma) { data->rx_status = DMA_RX_START; - uart_circ_clear(&port->state->xmit); + kfifo_reset(&port->state->port.xmit_fifo); } #endif memset(&port->icount, 0, sizeof(port->icount)); diff --git a/drivers/tty/serial/8250/8250_of.c b/drivers/tty/serial/8250/8250_of.c index 5d1dd992d8..e14f47ef11 100644 --- a/drivers/tty/serial/8250/8250_of.c +++ b/drivers/tty/serial/8250/8250_of.c @@ -18,6 +18,7 @@ #include <linux/pm_runtime.h> #include <linux/clk.h> #include <linux/reset.h> +#include <linux/notifier.h> #include "8250.h" @@ -26,6 +27,7 @@ struct of_serial_info { struct reset_control *rst; int type; int line; + struct notifier_block clk_notifier; }; /* Nuvoton NPCM timeout register */ @@ -58,6 +60,26 @@ static int npcm_setup(struct uart_port *port) return 0; } +static inline struct of_serial_info *clk_nb_to_info(struct notifier_block *nb) +{ + return container_of(nb, struct of_serial_info, clk_notifier); +} + +static int of_platform_serial_clk_notifier_cb(struct notifier_block *nb, unsigned long event, + void *data) +{ + struct of_serial_info *info = clk_nb_to_info(nb); + struct uart_8250_port *port8250 = serial8250_get_port(info->line); + struct clk_notifier_data *ndata = data; + + if (event == POST_RATE_CHANGE) { + serial8250_update_uartclk(&port8250->port, ndata->new_rate); + return NOTIFY_OK; + } + + return NOTIFY_DONE; +} + /* * Fill a struct uart_port for a given device node */ @@ -218,7 +240,19 @@ static int of_platform_serial_probe(struct platform_device *ofdev) info->type = port_type; info->line = ret; platform_set_drvdata(ofdev, info); + + if (info->clk) { + info->clk_notifier.notifier_call = of_platform_serial_clk_notifier_cb; + ret = clk_notifier_register(info->clk, &info->clk_notifier); + if (ret) { + dev_err_probe(port8250.port.dev, ret, "Failed to set the clock notifier\n"); + goto err_unregister; + } + } + return 0; +err_unregister: + serial8250_unregister_port(info->line); err_dispose: pm_runtime_put_sync(&ofdev->dev); pm_runtime_disable(&ofdev->dev); @@ -234,6 +268,9 @@ static void of_platform_serial_remove(struct platform_device *ofdev) { struct of_serial_info *info = platform_get_drvdata(ofdev); + if (info->clk) + clk_notifier_unregister(info->clk, &info->clk_notifier); + serial8250_unregister_port(info->line); reset_control_assert(info->rst); diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c index ddf23ccbc9..1af9aed99c 100644 --- a/drivers/tty/serial/8250/8250_omap.c +++ b/drivers/tty/serial/8250/8250_omap.c @@ -19,7 +19,6 @@ #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/of.h> -#include <linux/of_gpio.h> #include <linux/of_irq.h> #include <linux/delay.h> #include <linux/pm_runtime.h> @@ -1110,7 +1109,7 @@ static void omap_8250_dma_tx_complete(void *param) { struct uart_8250_port *p = param; struct uart_8250_dma *dma = p->dma; - struct circ_buf *xmit = &p->port.state->xmit; + struct tty_port *tport = &p->port.state->port; unsigned long flags; bool en_thri = false; struct omap8250_priv *priv = p->port.private_data; @@ -1129,10 +1128,10 @@ static void omap_8250_dma_tx_complete(void *param) omap8250_restore_regs(p); } - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(&p->port); - if (!uart_circ_empty(xmit) && !uart_tx_stopped(&p->port)) { + if (!kfifo_is_empty(&tport->xmit_fifo) && !uart_tx_stopped(&p->port)) { int ret; ret = omap_8250_tx_dma(p); @@ -1154,14 +1153,15 @@ static int omap_8250_tx_dma(struct uart_8250_port *p) { struct uart_8250_dma *dma = p->dma; struct omap8250_priv *priv = p->port.private_data; - struct circ_buf *xmit = &p->port.state->xmit; + struct tty_port *tport = &p->port.state->port; struct dma_async_tx_descriptor *desc; - unsigned int skip_byte = 0; + struct scatterlist sg; + int skip_byte = -1; int ret; if (dma->tx_running) return 0; - if (uart_tx_stopped(&p->port) || uart_circ_empty(xmit)) { + if (uart_tx_stopped(&p->port) || kfifo_is_empty(&tport->xmit_fifo)) { /* * Even if no data, we need to return an error for the two cases @@ -1176,8 +1176,18 @@ static int omap_8250_tx_dma(struct uart_8250_port *p) return 0; } - dma->tx_size = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); + sg_init_table(&sg, 1); + ret = kfifo_dma_out_prepare_mapped(&tport->xmit_fifo, &sg, 1, + UART_XMIT_SIZE, dma->tx_addr); + if (ret != 1) { + serial8250_clear_THRI(p); + return 0; + } + + dma->tx_size = sg_dma_len(&sg); + if (priv->habit & OMAP_DMA_TX_KICK) { + unsigned char c; u8 tx_lvl; /* @@ -1204,12 +1214,17 @@ static int omap_8250_tx_dma(struct uart_8250_port *p) ret = -EINVAL; goto err; } - skip_byte = 1; + if (!kfifo_get(&tport->xmit_fifo, &c)) { + ret = -EINVAL; + goto err; + } + skip_byte = c; + /* now we need to recompute due to kfifo_get */ + kfifo_dma_out_prepare_mapped(&tport->xmit_fifo, &sg, 1, + UART_XMIT_SIZE, dma->tx_addr); } - desc = dmaengine_prep_slave_single(dma->txchan, - dma->tx_addr + xmit->tail + skip_byte, - dma->tx_size - skip_byte, DMA_MEM_TO_DEV, + desc = dmaengine_prep_slave_sg(dma->txchan, &sg, 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!desc) { ret = -EBUSY; @@ -1231,11 +1246,13 @@ static int omap_8250_tx_dma(struct uart_8250_port *p) dma->tx_err = 0; serial8250_clear_THRI(p); - if (skip_byte) - serial_out(p, UART_TX, xmit->buf[xmit->tail]); - return 0; + ret = 0; + goto out_skip; err: dma->tx_err = 1; +out_skip: + if (skip_byte >= 0) + serial_out(p, UART_TX, skip_byte); return ret; } @@ -1324,7 +1341,7 @@ static int omap_8250_dma_handle_irq(struct uart_port *port) serial8250_modem_status(up); if (status & UART_LSR_THRE && up->dma->tx_err) { if (uart_tx_stopped(&up->port) || - uart_circ_empty(&up->port.state->xmit)) { + kfifo_is_empty(&up->port.state->port.xmit_fifo)) { up->dma->tx_err = 0; serial8250_tx_chars(up); } else { diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c index fe0fb2b4e9..e1d7aa2fa3 100644 --- a/drivers/tty/serial/8250/8250_pci.c +++ b/drivers/tty/serial/8250/8250_pci.c @@ -4119,7 +4119,7 @@ pciserial_init_ports(struct pci_dev *dev, const struct pciserial_board *board) rc = pci_alloc_irq_vectors(dev, 1, 1, PCI_IRQ_ALL_TYPES); } else { pci_dbg(dev, "Using legacy interrupts\n"); - rc = pci_alloc_irq_vectors(dev, 1, 1, PCI_IRQ_LEGACY); + rc = pci_alloc_irq_vectors(dev, 1, 1, PCI_IRQ_INTX); } if (rc < 0) { kfree(priv); diff --git a/drivers/tty/serial/8250/8250_pci1xxxx.c b/drivers/tty/serial/8250/8250_pci1xxxx.c index 2fbb5851f7..d3930bf32f 100644 --- a/drivers/tty/serial/8250/8250_pci1xxxx.c +++ b/drivers/tty/serial/8250/8250_pci1xxxx.c @@ -382,10 +382,10 @@ static void pci1xxxx_rx_burst(struct uart_port *port, u32 uart_status) } static void pci1xxxx_process_write_data(struct uart_port *port, - struct circ_buf *xmit, int *data_empty_count, u32 *valid_byte_count) { + struct tty_port *tport = &port->state->port; u32 valid_burst_count = *valid_byte_count / UART_BURST_SIZE; /* @@ -395,41 +395,36 @@ static void pci1xxxx_process_write_data(struct uart_port *port, * one byte at a time. */ while (valid_burst_count) { + u32 c; + if (*data_empty_count - UART_BURST_SIZE < 0) break; - if (xmit->tail > (UART_XMIT_SIZE - UART_BURST_SIZE)) + if (kfifo_len(&tport->xmit_fifo) < UART_BURST_SIZE) + break; + if (WARN_ON(kfifo_out(&tport->xmit_fifo, (u8 *)&c, sizeof(c)) != + sizeof(c))) break; - writel(*(unsigned int *)&xmit->buf[xmit->tail], - port->membase + UART_TX_BURST_FIFO); + writel(c, port->membase + UART_TX_BURST_FIFO); *valid_byte_count -= UART_BURST_SIZE; *data_empty_count -= UART_BURST_SIZE; valid_burst_count -= UART_BYTE_SIZE; - - xmit->tail = (xmit->tail + UART_BURST_SIZE) & - (UART_XMIT_SIZE - 1); } while (*valid_byte_count) { - if (*data_empty_count - UART_BYTE_SIZE < 0) + u8 c; + + if (!kfifo_get(&tport->xmit_fifo, &c)) break; - writeb(xmit->buf[xmit->tail], port->membase + - UART_TX_BYTE_FIFO); + writeb(c, port->membase + UART_TX_BYTE_FIFO); *data_empty_count -= UART_BYTE_SIZE; *valid_byte_count -= UART_BYTE_SIZE; /* - * When the tail of the circular buffer is reached, the next - * byte is transferred to the beginning of the buffer. - */ - xmit->tail = (xmit->tail + UART_BYTE_SIZE) & - (UART_XMIT_SIZE - 1); - - /* * If there are any pending burst count, data is handled by * transmitting DWORDs at a time. */ - if (valid_burst_count && (xmit->tail < - (UART_XMIT_SIZE - UART_BURST_SIZE))) + if (valid_burst_count && + kfifo_len(&tport->xmit_fifo) >= UART_BURST_SIZE) break; } } @@ -437,11 +432,9 @@ static void pci1xxxx_process_write_data(struct uart_port *port, static void pci1xxxx_tx_burst(struct uart_port *port, u32 uart_status) { struct uart_8250_port *up = up_to_u8250p(port); + struct tty_port *tport = &port->state->port; u32 valid_byte_count; int data_empty_count; - struct circ_buf *xmit; - - xmit = &port->state->xmit; if (port->x_char) { writeb(port->x_char, port->membase + UART_TX); @@ -450,25 +443,25 @@ static void pci1xxxx_tx_burst(struct uart_port *port, u32 uart_status) return; } - if ((uart_tx_stopped(port)) || (uart_circ_empty(xmit))) { + if ((uart_tx_stopped(port)) || kfifo_is_empty(&tport->xmit_fifo)) { port->ops->stop_tx(port); } else { data_empty_count = (pci1xxxx_read_burst_status(port) & UART_BST_STAT_TX_COUNT_MASK) >> 8; do { - valid_byte_count = uart_circ_chars_pending(xmit); + valid_byte_count = kfifo_len(&tport->xmit_fifo); - pci1xxxx_process_write_data(port, xmit, + pci1xxxx_process_write_data(port, &data_empty_count, &valid_byte_count); port->icount.tx++; - if (uart_circ_empty(xmit)) + if (kfifo_is_empty(&tport->xmit_fifo)) break; } while (data_empty_count && valid_byte_count); } - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); /* @@ -476,7 +469,8 @@ static void pci1xxxx_tx_burst(struct uart_port *port, u32 uart_status) * the HW can go idle. So we get here once again with empty FIFO and * disable the interrupt and RPM in __stop_tx() */ - if (uart_circ_empty(xmit) && !(up->capabilities & UART_CAP_RPM)) + if (kfifo_is_empty(&tport->xmit_fifo) && + !(up->capabilities & UART_CAP_RPM)) port->ops->stop_tx(port); } diff --git a/drivers/tty/serial/8250/8250_pnp.c b/drivers/tty/serial/8250/8250_pnp.c index 1974bbadc9..7c06ae79d8 100644 --- a/drivers/tty/serial/8250/8250_pnp.c +++ b/drivers/tty/serial/8250/8250_pnp.c @@ -10,6 +10,7 @@ */ #include <linux/module.h> #include <linux/pci.h> +#include <linux/pm.h> #include <linux/pnp.h> #include <linux/string.h> #include <linux/kernel.h> @@ -434,7 +435,9 @@ static int serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id) { struct uart_8250_port uart, *port; - int ret, line, flags = dev_id->driver_data; + int ret, flags = dev_id->driver_data; + unsigned char iotype; + long line; if (flags & UNKNOWN_DEV) { ret = serial_pnp_guess_board(dev); @@ -443,37 +446,46 @@ serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id) } memset(&uart, 0, sizeof(uart)); - if (pnp_irq_valid(dev, 0)) - uart.port.irq = pnp_irq(dev, 0); if ((flags & CIR_PORT) && pnp_port_valid(dev, 2)) { uart.port.iobase = pnp_port_start(dev, 2); - uart.port.iotype = UPIO_PORT; + iotype = UPIO_PORT; } else if (pnp_port_valid(dev, 0)) { uart.port.iobase = pnp_port_start(dev, 0); - uart.port.iotype = UPIO_PORT; + iotype = UPIO_PORT; } else if (pnp_mem_valid(dev, 0)) { uart.port.mapbase = pnp_mem_start(dev, 0); - uart.port.iotype = UPIO_MEM; + uart.port.mapsize = pnp_mem_len(dev, 0); + iotype = UPIO_MEM; uart.port.flags = UPF_IOREMAP; } else return -ENODEV; - dev_dbg(&dev->dev, - "Setup PNP port: port %#lx, mem %#llx, irq %u, type %u\n", - uart.port.iobase, (unsigned long long)uart.port.mapbase, - uart.port.irq, uart.port.iotype); + uart.port.uartclk = 1843200; + uart.port.dev = &dev->dev; + uart.port.flags |= UPF_SKIP_TEST | UPF_BOOT_AUTOCONF; + + ret = uart_read_port_properties(&uart.port); + /* no interrupt -> fall back to polling */ + if (ret == -ENXIO) + ret = 0; + if (ret) + return ret; + + /* + * The previous call may not set iotype correctly when reg-io-width + * property is absent and it doesn't support IO port resource. + */ + uart.port.iotype = iotype; if (flags & CIR_PORT) { uart.port.flags |= UPF_FIXED_PORT | UPF_FIXED_TYPE; uart.port.type = PORT_8250_CIR; } - uart.port.flags |= UPF_SKIP_TEST | UPF_BOOT_AUTOCONF; - if (pnp_irq_flags(dev, 0) & IORESOURCE_IRQ_SHAREABLE) - uart.port.flags |= UPF_SHARE_IRQ; - uart.port.uartclk = 1843200; - device_property_read_u32(&dev->dev, "clock-frequency", &uart.port.uartclk); - uart.port.dev = &dev->dev; + dev_dbg(&dev->dev, + "Setup PNP port: port %#lx, mem %#llx, size %#llx, irq %u, type %u\n", + uart.port.iobase, (unsigned long long)uart.port.mapbase, + (unsigned long long)uart.port.mapsize, uart.port.irq, uart.port.iotype); line = serial8250_register_8250_port(&uart); if (line < 0 || (flags & CIR_PORT)) @@ -483,7 +495,7 @@ serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id) if (uart_console(&port->port)) dev->capabilities |= PNP_CONSOLE; - pnp_set_drvdata(dev, (void *)((long)line + 1)); + pnp_set_drvdata(dev, (void *)line); return 0; } @@ -492,38 +504,33 @@ static void serial_pnp_remove(struct pnp_dev *dev) long line = (long)pnp_get_drvdata(dev); dev->capabilities &= ~PNP_CONSOLE; - if (line) - serial8250_unregister_port(line - 1); + serial8250_unregister_port(line); } -static int __maybe_unused serial_pnp_suspend(struct device *dev) +static int serial_pnp_suspend(struct device *dev) { long line = (long)dev_get_drvdata(dev); - if (!line) - return -ENODEV; - serial8250_suspend_port(line - 1); + serial8250_suspend_port(line); return 0; } -static int __maybe_unused serial_pnp_resume(struct device *dev) +static int serial_pnp_resume(struct device *dev) { long line = (long)dev_get_drvdata(dev); - if (!line) - return -ENODEV; - serial8250_resume_port(line - 1); + serial8250_resume_port(line); return 0; } -static SIMPLE_DEV_PM_OPS(serial_pnp_pm_ops, serial_pnp_suspend, serial_pnp_resume); +static DEFINE_SIMPLE_DEV_PM_OPS(serial_pnp_pm_ops, serial_pnp_suspend, serial_pnp_resume); static struct pnp_driver serial_pnp_driver = { .name = "serial", .probe = serial_pnp_probe, .remove = serial_pnp_remove, .driver = { - .pm = &serial_pnp_pm_ops, + .pm = pm_sleep_ptr(&serial_pnp_pm_ops), }, .id_table = pnp_dev_table, }; diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index fc9dd5d452..893bc493f6 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -612,13 +612,6 @@ int serial8250_em485_config(struct uart_port *port, struct ktermios *termios, { struct uart_8250_port *up = up_to_u8250p(port); - /* pick sane settings if the user hasn't */ - if (!!(rs485->flags & SER_RS485_RTS_ON_SEND) == - !!(rs485->flags & SER_RS485_RTS_AFTER_SEND)) { - rs485->flags |= SER_RS485_RTS_ON_SEND; - rs485->flags &= ~SER_RS485_RTS_AFTER_SEND; - } - /* * Both serial8250_em485_init() and serial8250_em485_destroy() * are idempotent. @@ -1630,7 +1623,7 @@ static void serial8250_start_tx(struct uart_port *port) /* Port locked to synchronize UART_IER access against the console. */ lockdep_assert_held_once(&port->lock); - if (!port->x_char && uart_circ_empty(&port->state->xmit)) + if (!port->x_char && kfifo_is_empty(&port->state->port.xmit_fifo)) return; serial8250_rpm_get_tx(up); @@ -1778,7 +1771,7 @@ EXPORT_SYMBOL_GPL(serial8250_rx_chars); void serial8250_tx_chars(struct uart_8250_port *up) { struct uart_port *port = &up->port; - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; int count; if (port->x_char) { @@ -1789,14 +1782,19 @@ void serial8250_tx_chars(struct uart_8250_port *up) serial8250_stop_tx(port); return; } - if (uart_circ_empty(xmit)) { + if (kfifo_is_empty(&tport->xmit_fifo)) { __stop_tx(up); return; } count = up->tx_loadsz; do { - serial_out(up, UART_TX, xmit->buf[xmit->tail]); + unsigned char c; + + if (!uart_fifo_get(port, &c)) + break; + + serial_out(up, UART_TX, c); if (up->bugs & UART_BUG_TXRACE) { /* * The Aspeed BMC virtual UARTs have a bug where data @@ -1809,9 +1807,7 @@ void serial8250_tx_chars(struct uart_8250_port *up) */ serial_in(up, UART_SCR); } - uart_xmit_advance(port, 1); - if (uart_circ_empty(xmit)) - break; + if ((up->capabilities & UART_CAP_HFIFO) && !uart_lsr_tx_empty(serial_in(up, UART_LSR))) break; @@ -1821,7 +1817,7 @@ void serial8250_tx_chars(struct uart_8250_port *up) break; } while (--count > 0); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); /* @@ -1829,7 +1825,8 @@ void serial8250_tx_chars(struct uart_8250_port *up) * HW can go idle. So we get here once again with empty FIFO and disable * the interrupt and RPM in __stop_tx() */ - if (uart_circ_empty(xmit) && !(up->capabilities & UART_CAP_RPM)) + if (kfifo_is_empty(&tport->xmit_fifo) && + !(up->capabilities & UART_CAP_RPM)) __stop_tx(up); } EXPORT_SYMBOL_GPL(serial8250_tx_chars); diff --git a/drivers/tty/serial/8250/Makefile b/drivers/tty/serial/8250/Makefile index ea2e81f58e..69ac002705 100644 --- a/drivers/tty/serial/8250/Makefile +++ b/drivers/tty/serial/8250/Makefile @@ -5,8 +5,6 @@ obj-$(CONFIG_SERIAL_8250) += 8250.o 8250_base.o 8250-y := 8250_core.o -8250-$(CONFIG_ALPHA_GENERIC) += 8250_alpha.o -8250-$(CONFIG_ALPHA_JENSEN) += 8250_alpha.o 8250-$(CONFIG_SERIAL_8250_PNP) += 8250_pnp.o 8250_base-y := 8250_port.o 8250_base-$(CONFIG_SERIAL_8250_DMA) += 8250_dma.o diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index ffcf4882b2..28e4beeabf 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -307,11 +307,14 @@ config SERIAL_TEGRA_TCU_CONSOLE If unsure, say Y. config SERIAL_MAX3100 - tristate "MAX3100 support" + tristate "MAX3100/3110/3111/3222 support" depends on SPI select SERIAL_CORE help - MAX3100 chip support + This selects support for an advanced UART from Maxim. + Supported ICs are MAX3100, MAX3110, MAX3111, MAX3222. + + Say Y here if you want to support these ICs. config SERIAL_MAX310X tristate "MAX310X support" @@ -1020,42 +1023,32 @@ config SERIAL_SCCNXP_CONSOLE help Support for console on SCCNXP serial ports. -config SERIAL_SC16IS7XX_CORE - tristate - config SERIAL_SC16IS7XX - tristate "SC16IS7xx serial support" + tristate "NXP SC16IS7xx UART support" + depends on SPI_MASTER || I2C select SERIAL_CORE - depends on (SPI_MASTER && !I2C) || I2C + select SERIAL_SC16IS7XX_SPI if SPI_MASTER + select SERIAL_SC16IS7XX_I2C if I2C help - This selects support for SC16IS7xx serial ports. - Supported ICs are SC16IS740, SC16IS741, SC16IS750, SC16IS752, - SC16IS760 and SC16IS762. Select supported buses using options below. + Core driver for NXP SC16IS7xx UARTs. + Supported ICs are: + + SC16IS740 + SC16IS741 + SC16IS750 + SC16IS752 + SC16IS760 + SC16IS762 + + The driver supports both I2C and SPI interfaces. config SERIAL_SC16IS7XX_I2C - bool "SC16IS7xx for I2C interface" - depends on SERIAL_SC16IS7XX - depends on I2C - select SERIAL_SC16IS7XX_CORE if SERIAL_SC16IS7XX - select REGMAP_I2C if I2C - default y - help - Enable SC16IS7xx driver on I2C bus, - If required say y, and say n to i2c if not required, - Enabled by default to support oldconfig. - You must select at least one bus for the driver to be built. + tristate + select REGMAP_I2C config SERIAL_SC16IS7XX_SPI - bool "SC16IS7xx for spi interface" - depends on SERIAL_SC16IS7XX - depends on SPI_MASTER - select SERIAL_SC16IS7XX_CORE if SERIAL_SC16IS7XX - select REGMAP_SPI if SPI_MASTER - help - Enable SC16IS7xx driver on SPI bus, - If required say y, and say n to spi if not required, - This is additional support to existing driver. - You must select at least one bus for the driver to be built. + tristate + select REGMAP_SPI config SERIAL_TIMBERDALE tristate "Support for timberdale UART" diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile index b25e9b54a6..6ff74f0a95 100644 --- a/drivers/tty/serial/Makefile +++ b/drivers/tty/serial/Makefile @@ -75,7 +75,9 @@ obj-$(CONFIG_SERIAL_SA1100) += sa1100.o obj-$(CONFIG_SERIAL_SAMSUNG) += samsung_tty.o obj-$(CONFIG_SERIAL_SB1250_DUART) += sb1250-duart.o obj-$(CONFIG_SERIAL_SCCNXP) += sccnxp.o -obj-$(CONFIG_SERIAL_SC16IS7XX_CORE) += sc16is7xx.o +obj-$(CONFIG_SERIAL_SC16IS7XX) += sc16is7xx.o +obj-$(CONFIG_SERIAL_SC16IS7XX_SPI) += sc16is7xx_spi.o +obj-$(CONFIG_SERIAL_SC16IS7XX_I2C) += sc16is7xx_i2c.o obj-$(CONFIG_SERIAL_SH_SCI) += sh-sci.o obj-$(CONFIG_SERIAL_SIFIVE) += sifive.o obj-$(CONFIG_SERIAL_SPRD) += sprd_serial.o diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c index 2fa3fb30dc..8b1644f541 100644 --- a/drivers/tty/serial/amba-pl011.c +++ b/drivers/tty/serial/amba-pl011.c @@ -256,7 +256,6 @@ struct uart_amba_port { const u16 *reg_offset; struct clk *clk; const struct vendor_data *vendor; - unsigned int dmacr; /* dma control reg */ unsigned int im; /* interrupt mask */ unsigned int old_status; unsigned int fifosize; /* vendor-specific */ @@ -266,6 +265,7 @@ struct uart_amba_port { unsigned int rs485_tx_drain_interval; /* usecs */ #ifdef CONFIG_DMA_ENGINE /* DMA stuff */ + unsigned int dmacr; /* dma control reg */ bool using_tx_dma; bool using_rx_dma; struct pl011_dmarx_data dmarx; @@ -535,6 +535,7 @@ static void pl011_start_tx_pio(struct uart_amba_port *uap); static void pl011_dma_tx_callback(void *data) { struct uart_amba_port *uap = data; + struct tty_port *tport = &uap->port.state->port; struct pl011_dmatx_data *dmatx = &uap->dmatx; unsigned long flags; u16 dmacr; @@ -558,7 +559,7 @@ static void pl011_dma_tx_callback(void *data) * get further refills (hence we check dmacr). */ if (!(dmacr & UART011_TXDMAE) || uart_tx_stopped(&uap->port) || - uart_circ_empty(&uap->port.state->xmit)) { + kfifo_is_empty(&tport->xmit_fifo)) { uap->dmatx.queued = false; uart_port_unlock_irqrestore(&uap->port, flags); return; @@ -588,7 +589,7 @@ static int pl011_dma_tx_refill(struct uart_amba_port *uap) struct dma_chan *chan = dmatx->chan; struct dma_device *dma_dev = chan->device; struct dma_async_tx_descriptor *desc; - struct circ_buf *xmit = &uap->port.state->xmit; + struct tty_port *tport = &uap->port.state->port; unsigned int count; /* @@ -597,7 +598,7 @@ static int pl011_dma_tx_refill(struct uart_amba_port *uap) * the standard interrupt handling. This ensures that we * issue a uart_write_wakeup() at the appropriate time. */ - count = uart_circ_chars_pending(xmit); + count = kfifo_len(&tport->xmit_fifo); if (count < (uap->fifosize >> 1)) { uap->dmatx.queued = false; return 0; @@ -613,21 +614,7 @@ static int pl011_dma_tx_refill(struct uart_amba_port *uap) if (count > PL011_DMA_BUFFER_SIZE) count = PL011_DMA_BUFFER_SIZE; - if (xmit->tail < xmit->head) { - memcpy(&dmatx->buf[0], &xmit->buf[xmit->tail], count); - } else { - size_t first = UART_XMIT_SIZE - xmit->tail; - size_t second; - - if (first > count) - first = count; - second = count - first; - - memcpy(&dmatx->buf[0], &xmit->buf[xmit->tail], first); - if (second) - memcpy(&dmatx->buf[first], &xmit->buf[0], second); - } - + count = kfifo_out_peek(&tport->xmit_fifo, dmatx->buf, count); dmatx->len = count; dmatx->dma = dma_map_single(dma_dev->dev, dmatx->buf, count, DMA_TO_DEVICE); @@ -670,7 +657,7 @@ static int pl011_dma_tx_refill(struct uart_amba_port *uap) */ uart_xmit_advance(&uap->port, count); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(&uap->port); return 1; @@ -1454,7 +1441,7 @@ static bool pl011_tx_char(struct uart_amba_port *uap, unsigned char c, /* Returns true if tx interrupts have to be (kept) enabled */ static bool pl011_tx_chars(struct uart_amba_port *uap, bool from_irq) { - struct circ_buf *xmit = &uap->port.state->xmit; + struct tty_port *tport = &uap->port.state->port; int count = uap->fifosize >> 1; if (uap->port.x_char) { @@ -1463,7 +1450,7 @@ static bool pl011_tx_chars(struct uart_amba_port *uap, bool from_irq) uap->port.x_char = 0; --count; } - if (uart_circ_empty(xmit) || uart_tx_stopped(&uap->port)) { + if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(&uap->port)) { pl011_stop_tx(&uap->port); return false; } @@ -1472,20 +1459,25 @@ static bool pl011_tx_chars(struct uart_amba_port *uap, bool from_irq) if (pl011_dma_tx_irq(uap)) return true; - do { + while (1) { + unsigned char c; + if (likely(from_irq) && count-- == 0) break; - if (!pl011_tx_char(uap, xmit->buf[xmit->tail], from_irq)) + if (!kfifo_peek(&tport->xmit_fifo, &c)) break; - xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); - } while (!uart_circ_empty(xmit)); + if (!pl011_tx_char(uap, c, from_irq)) + break; + + kfifo_skip(&tport->xmit_fifo); + } - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(&uap->port); - if (uart_circ_empty(xmit)) { + if (kfifo_is_empty(&tport->xmit_fifo)) { pl011_stop_tx(&uap->port); return false; } @@ -2700,18 +2692,6 @@ static int pl011_find_free_port(void) return -EBUSY; } -static int pl011_get_rs485_mode(struct uart_amba_port *uap) -{ - struct uart_port *port = &uap->port; - int ret; - - ret = uart_get_rs485_mode(port); - if (ret) - return ret; - - return 0; -} - static int pl011_setup_port(struct device *dev, struct uart_amba_port *uap, struct resource *mmiobase, int index) { @@ -2732,7 +2712,7 @@ static int pl011_setup_port(struct device *dev, struct uart_amba_port *uap, uap->port.flags = UPF_BOOT_AUTOCONF; uap->port.line = index; - ret = pl011_get_rs485_mode(uap); + ret = uart_get_rs485_mode(&uap->port); if (ret) return ret; diff --git a/drivers/tty/serial/ar933x_uart.c b/drivers/tty/serial/ar933x_uart.c index 7790cbc573..47889a5571 100644 --- a/drivers/tty/serial/ar933x_uart.c +++ b/drivers/tty/serial/ar933x_uart.c @@ -390,7 +390,7 @@ static void ar933x_uart_rx_chars(struct ar933x_uart_port *up) static void ar933x_uart_tx_chars(struct ar933x_uart_port *up) { - struct circ_buf *xmit = &up->port.state->xmit; + struct tty_port *tport = &up->port.state->port; struct serial_rs485 *rs485conf = &up->port.rs485; int count; bool half_duplex_send = false; @@ -399,7 +399,7 @@ static void ar933x_uart_tx_chars(struct ar933x_uart_port *up) return; if ((rs485conf->flags & SER_RS485_ENABLED) && - (up->port.x_char || !uart_circ_empty(xmit))) { + (up->port.x_char || !kfifo_is_empty(&tport->xmit_fifo))) { ar933x_uart_stop_rx_interrupt(up); gpiod_set_value(up->rts_gpiod, !!(rs485conf->flags & SER_RS485_RTS_ON_SEND)); half_duplex_send = true; @@ -408,6 +408,7 @@ static void ar933x_uart_tx_chars(struct ar933x_uart_port *up) count = up->port.fifosize; do { unsigned int rdata; + unsigned char c; rdata = ar933x_uart_read(up, AR933X_UART_DATA_REG); if ((rdata & AR933X_UART_DATA_TX_CSR) == 0) @@ -420,18 +421,16 @@ static void ar933x_uart_tx_chars(struct ar933x_uart_port *up) continue; } - if (uart_circ_empty(xmit)) + if (!uart_fifo_get(&up->port, &c)) break; - ar933x_uart_putc(up, xmit->buf[xmit->tail]); - - uart_xmit_advance(&up->port, 1); + ar933x_uart_putc(up, c); } while (--count > 0); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(&up->port); - if (!uart_circ_empty(xmit)) { + if (!kfifo_is_empty(&tport->xmit_fifo)) { ar933x_uart_start_tx_interrupt(up); } else if (half_duplex_send) { ar933x_uart_wait_tx_complete(up); @@ -693,7 +692,6 @@ static struct uart_driver ar933x_uart_driver = { .cons = NULL, /* filled in runtime */ }; -static const struct serial_rs485 ar933x_no_rs485 = {}; static const struct serial_rs485 ar933x_rs485_supported = { .flags = SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND | SER_RS485_RTS_AFTER_SEND, }; @@ -789,7 +787,7 @@ static int ar933x_uart_probe(struct platform_device *pdev) up->rts_gpiod = mctrl_gpio_to_gpiod(up->gpios, UART_GPIO_RTS); if (!up->rts_gpiod) { - port->rs485_supported = ar933x_no_rs485; + port->rs485_supported.flags &= ~SER_RS485_ENABLED; if (port->rs485.flags & SER_RS485_ENABLED) { dev_err(&pdev->dev, "lacking rts-gpio, disabling RS485\n"); port->rs485.flags &= ~SER_RS485_ENABLED; diff --git a/drivers/tty/serial/arc_uart.c b/drivers/tty/serial/arc_uart.c index 1aa5b2b49c..5c4895d154 100644 --- a/drivers/tty/serial/arc_uart.c +++ b/drivers/tty/serial/arc_uart.c @@ -155,7 +155,7 @@ static unsigned int arc_serial_tx_empty(struct uart_port *port) */ static void arc_serial_tx_chars(struct uart_port *port) { - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; int sent = 0; unsigned char ch; @@ -164,9 +164,7 @@ static void arc_serial_tx_chars(struct uart_port *port) port->icount.tx++; port->x_char = 0; sent = 1; - } else if (!uart_circ_empty(xmit)) { - ch = xmit->buf[xmit->tail]; - uart_xmit_advance(port, 1); + } else if (uart_fifo_get(port, &ch)) { while (!(UART_GET_STATUS(port) & TXEMPTY)) cpu_relax(); UART_SET_DATA(port, ch); @@ -177,7 +175,7 @@ static void arc_serial_tx_chars(struct uart_port *port) * If num chars in xmit buffer are too few, ask tty layer for more. * By Hard ISR to schedule processing in software interrupt part */ - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); if (sent) diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index 85667f7095..0a90964d6d 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -96,7 +96,9 @@ struct atmel_uart_char { * can contain up to 1024 characters in PIO mode and up to 4096 characters in * DMA mode. */ -#define ATMEL_SERIAL_RINGSIZE 1024 +#define ATMEL_SERIAL_RINGSIZE 1024 +#define ATMEL_SERIAL_RX_SIZE array_size(sizeof(struct atmel_uart_char), \ + ATMEL_SERIAL_RINGSIZE) /* * at91: 6 USARTs and one DBGU port (SAM9260) @@ -132,8 +134,8 @@ struct atmel_uart_port { struct dma_async_tx_descriptor *desc_rx; dma_cookie_t cookie_tx; dma_cookie_t cookie_rx; - struct scatterlist sg_tx; - struct scatterlist sg_rx; + dma_addr_t tx_phys; + dma_addr_t rx_phys; struct tasklet_struct tasklet_rx; struct tasklet_struct tasklet_tx; atomic_t tasklet_shutdown; @@ -857,7 +859,7 @@ static void atmel_complete_tx_dma(void *arg) { struct atmel_uart_port *atmel_port = arg; struct uart_port *port = &atmel_port->uart; - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; struct dma_chan *chan = atmel_port->chan_tx; unsigned long flags; @@ -873,15 +875,15 @@ static void atmel_complete_tx_dma(void *arg) atmel_port->desc_tx = NULL; spin_unlock(&atmel_port->lock_tx); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); /* - * xmit is a circular buffer so, if we have just send data from - * xmit->tail to the end of xmit->buf, now we have to transmit the - * remaining data from the beginning of xmit->buf to xmit->head. + * xmit is a circular buffer so, if we have just send data from the + * tail to the end, now we have to transmit the remaining data from the + * beginning to the head. */ - if (!uart_circ_empty(xmit)) + if (!kfifo_is_empty(&tport->xmit_fifo)) atmel_tasklet_schedule(atmel_port, &atmel_port->tasklet_tx); else if (atmel_uart_is_half_duplex(port)) { /* @@ -904,8 +906,8 @@ static void atmel_release_tx_dma(struct uart_port *port) if (chan) { dmaengine_terminate_all(chan); dma_release_channel(chan); - dma_unmap_sg(port->dev, &atmel_port->sg_tx, 1, - DMA_TO_DEVICE); + dma_unmap_single(port->dev, atmel_port->tx_phys, + UART_XMIT_SIZE, DMA_TO_DEVICE); } atmel_port->desc_tx = NULL; @@ -919,18 +921,18 @@ static void atmel_release_tx_dma(struct uart_port *port) static void atmel_tx_dma(struct uart_port *port) { struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; struct dma_chan *chan = atmel_port->chan_tx; struct dma_async_tx_descriptor *desc; - struct scatterlist sgl[2], *sg, *sg_tx = &atmel_port->sg_tx; - unsigned int tx_len, part1_len, part2_len, sg_len; + struct scatterlist sgl[2], *sg; + unsigned int tx_len, tail, part1_len, part2_len, sg_len; dma_addr_t phys_addr; /* Make sure we have an idle channel */ if (atmel_port->desc_tx != NULL) return; - if (!uart_circ_empty(xmit) && !uart_tx_stopped(port)) { + if (!kfifo_is_empty(&tport->xmit_fifo) && !uart_tx_stopped(port)) { /* * DMA is idle now. * Port xmit buffer is already mapped, @@ -940,9 +942,8 @@ static void atmel_tx_dma(struct uart_port *port) * Take the port lock to get a * consistent xmit buffer state. */ - tx_len = CIRC_CNT_TO_END(xmit->head, - xmit->tail, - UART_XMIT_SIZE); + tx_len = kfifo_out_linear(&tport->xmit_fifo, &tail, + UART_XMIT_SIZE); if (atmel_port->fifo_size) { /* multi data mode */ @@ -956,7 +957,7 @@ static void atmel_tx_dma(struct uart_port *port) sg_init_table(sgl, 2); sg_len = 0; - phys_addr = sg_dma_address(sg_tx) + xmit->tail; + phys_addr = atmel_port->tx_phys + tail; if (part1_len) { sg = &sgl[sg_len++]; sg_dma_address(sg) = phys_addr; @@ -973,7 +974,7 @@ static void atmel_tx_dma(struct uart_port *port) /* * save tx_len so atmel_complete_tx_dma() will increase - * xmit->tail correctly + * tail correctly */ atmel_port->tx_len = tx_len; @@ -988,7 +989,8 @@ static void atmel_tx_dma(struct uart_port *port) return; } - dma_sync_sg_for_device(port->dev, sg_tx, 1, DMA_TO_DEVICE); + dma_sync_single_for_device(port->dev, atmel_port->tx_phys, + UART_XMIT_SIZE, DMA_TO_DEVICE); atmel_port->desc_tx = desc; desc->callback = atmel_complete_tx_dma; @@ -1003,18 +1005,19 @@ static void atmel_tx_dma(struct uart_port *port) dma_async_issue_pending(chan); } - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); } static int atmel_prepare_tx_dma(struct uart_port *port) { struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + struct tty_port *tport = &port->state->port; struct device *mfd_dev = port->dev->parent; dma_cap_mask_t mask; struct dma_slave_config config; struct dma_chan *chan; - int ret, nent; + int ret; dma_cap_zero(mask); dma_cap_set(DMA_SLAVE, mask); @@ -1029,26 +1032,18 @@ static int atmel_prepare_tx_dma(struct uart_port *port) dma_chan_name(atmel_port->chan_tx)); spin_lock_init(&atmel_port->lock_tx); - sg_init_table(&atmel_port->sg_tx, 1); /* UART circular tx buffer is an aligned page. */ - BUG_ON(!PAGE_ALIGNED(port->state->xmit.buf)); - sg_set_page(&atmel_port->sg_tx, - virt_to_page(port->state->xmit.buf), - UART_XMIT_SIZE, - offset_in_page(port->state->xmit.buf)); - nent = dma_map_sg(port->dev, - &atmel_port->sg_tx, - 1, - DMA_TO_DEVICE); - - if (!nent) { + BUG_ON(!PAGE_ALIGNED(tport->xmit_buf)); + atmel_port->tx_phys = dma_map_single(port->dev, tport->xmit_buf, + UART_XMIT_SIZE, DMA_TO_DEVICE); + + if (dma_mapping_error(port->dev, atmel_port->tx_phys)) { dev_dbg(port->dev, "need to release resource of dma\n"); goto chan_err; } else { - dev_dbg(port->dev, "%s: mapped %d@%p to %pad\n", __func__, - sg_dma_len(&atmel_port->sg_tx), - port->state->xmit.buf, - &sg_dma_address(&atmel_port->sg_tx)); + dev_dbg(port->dev, "%s: mapped %lu@%p to %pad\n", __func__, + UART_XMIT_SIZE, tport->xmit_buf, + &atmel_port->tx_phys); } /* Configure the slave DMA */ @@ -1093,8 +1088,8 @@ static void atmel_release_rx_dma(struct uart_port *port) if (chan) { dmaengine_terminate_all(chan); dma_release_channel(chan); - dma_unmap_sg(port->dev, &atmel_port->sg_rx, 1, - DMA_FROM_DEVICE); + dma_unmap_single(port->dev, atmel_port->rx_phys, + ATMEL_SERIAL_RX_SIZE, DMA_FROM_DEVICE); } atmel_port->desc_rx = NULL; @@ -1127,10 +1122,8 @@ static void atmel_rx_from_dma(struct uart_port *port) } /* CPU claims ownership of RX DMA buffer */ - dma_sync_sg_for_cpu(port->dev, - &atmel_port->sg_rx, - 1, - DMA_FROM_DEVICE); + dma_sync_single_for_cpu(port->dev, atmel_port->rx_phys, + ATMEL_SERIAL_RX_SIZE, DMA_FROM_DEVICE); /* * ring->head points to the end of data already written by the DMA. @@ -1139,8 +1132,8 @@ static void atmel_rx_from_dma(struct uart_port *port) * The current transfer size should not be larger than the dma buffer * length. */ - ring->head = sg_dma_len(&atmel_port->sg_rx) - state.residue; - BUG_ON(ring->head > sg_dma_len(&atmel_port->sg_rx)); + ring->head = ATMEL_SERIAL_RX_SIZE - state.residue; + BUG_ON(ring->head > ATMEL_SERIAL_RX_SIZE); /* * At this point ring->head may point to the first byte right after the * last byte of the dma buffer: @@ -1154,7 +1147,7 @@ static void atmel_rx_from_dma(struct uart_port *port) * tail to the end of the buffer then reset tail. */ if (ring->head < ring->tail) { - count = sg_dma_len(&atmel_port->sg_rx) - ring->tail; + count = ATMEL_SERIAL_RX_SIZE - ring->tail; tty_insert_flip_string(tport, ring->buf + ring->tail, count); ring->tail = 0; @@ -1167,17 +1160,15 @@ static void atmel_rx_from_dma(struct uart_port *port) tty_insert_flip_string(tport, ring->buf + ring->tail, count); /* Wrap ring->head if needed */ - if (ring->head >= sg_dma_len(&atmel_port->sg_rx)) + if (ring->head >= ATMEL_SERIAL_RX_SIZE) ring->head = 0; ring->tail = ring->head; port->icount.rx += count; } /* USART retreives ownership of RX DMA buffer */ - dma_sync_sg_for_device(port->dev, - &atmel_port->sg_rx, - 1, - DMA_FROM_DEVICE); + dma_sync_single_for_device(port->dev, atmel_port->rx_phys, + ATMEL_SERIAL_RX_SIZE, DMA_FROM_DEVICE); tty_flip_buffer_push(tport); @@ -1193,7 +1184,7 @@ static int atmel_prepare_rx_dma(struct uart_port *port) struct dma_slave_config config; struct circ_buf *ring; struct dma_chan *chan; - int ret, nent; + int ret; ring = &atmel_port->rx_ring; @@ -1210,26 +1201,18 @@ static int atmel_prepare_rx_dma(struct uart_port *port) dma_chan_name(atmel_port->chan_rx)); spin_lock_init(&atmel_port->lock_rx); - sg_init_table(&atmel_port->sg_rx, 1); /* UART circular rx buffer is an aligned page. */ BUG_ON(!PAGE_ALIGNED(ring->buf)); - sg_set_page(&atmel_port->sg_rx, - virt_to_page(ring->buf), - sizeof(struct atmel_uart_char) * ATMEL_SERIAL_RINGSIZE, - offset_in_page(ring->buf)); - nent = dma_map_sg(port->dev, - &atmel_port->sg_rx, - 1, - DMA_FROM_DEVICE); - - if (!nent) { + atmel_port->rx_phys = dma_map_single(port->dev, ring->buf, + ATMEL_SERIAL_RX_SIZE, + DMA_FROM_DEVICE); + + if (dma_mapping_error(port->dev, atmel_port->rx_phys)) { dev_dbg(port->dev, "need to release resource of dma\n"); goto chan_err; } else { - dev_dbg(port->dev, "%s: mapped %d@%p to %pad\n", __func__, - sg_dma_len(&atmel_port->sg_rx), - ring->buf, - &sg_dma_address(&atmel_port->sg_rx)); + dev_dbg(port->dev, "%s: mapped %zu@%p to %pad\n", __func__, + ATMEL_SERIAL_RX_SIZE, ring->buf, &atmel_port->rx_phys); } /* Configure the slave DMA */ @@ -1250,9 +1233,9 @@ static int atmel_prepare_rx_dma(struct uart_port *port) * each one is half ring buffer size */ desc = dmaengine_prep_dma_cyclic(atmel_port->chan_rx, - sg_dma_address(&atmel_port->sg_rx), - sg_dma_len(&atmel_port->sg_rx), - sg_dma_len(&atmel_port->sg_rx)/2, + atmel_port->rx_phys, + ATMEL_SERIAL_RX_SIZE, + ATMEL_SERIAL_RX_SIZE / 2, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT); if (!desc) { @@ -1459,9 +1442,8 @@ static void atmel_release_tx_pdc(struct uart_port *port) static void atmel_tx_pdc(struct uart_port *port) { struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; struct atmel_dma_buffer *pdc = &atmel_port->pdc_tx; - int count; /* nothing left to transmit? */ if (atmel_uart_readl(port, ATMEL_PDC_TCR)) @@ -1474,17 +1456,19 @@ static void atmel_tx_pdc(struct uart_port *port) /* disable PDC transmit */ atmel_uart_writel(port, ATMEL_PDC_PTCR, ATMEL_PDC_TXTDIS); - if (!uart_circ_empty(xmit) && !uart_tx_stopped(port)) { + if (!kfifo_is_empty(&tport->xmit_fifo) && !uart_tx_stopped(port)) { + unsigned int count, tail; + dma_sync_single_for_device(port->dev, pdc->dma_addr, pdc->dma_size, DMA_TO_DEVICE); - count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); + count = kfifo_out_linear(&tport->xmit_fifo, &tail, + UART_XMIT_SIZE); pdc->ofs = count; - atmel_uart_writel(port, ATMEL_PDC_TPR, - pdc->dma_addr + xmit->tail); + atmel_uart_writel(port, ATMEL_PDC_TPR, pdc->dma_addr + tail); atmel_uart_writel(port, ATMEL_PDC_TCR, count); /* re-enable PDC transmit */ atmel_uart_writel(port, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN); @@ -1498,7 +1482,7 @@ static void atmel_tx_pdc(struct uart_port *port) } } - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); } @@ -1506,9 +1490,9 @@ static int atmel_prepare_tx_pdc(struct uart_port *port) { struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); struct atmel_dma_buffer *pdc = &atmel_port->pdc_tx; - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; - pdc->buf = xmit->buf; + pdc->buf = tport->xmit_buf; pdc->dma_addr = dma_map_single(port->dev, pdc->buf, UART_XMIT_SIZE, @@ -2953,9 +2937,7 @@ static int atmel_serial_probe(struct platform_device *pdev) if (!atmel_use_pdc_rx(&atmel_port->uart)) { ret = -ENOMEM; - data = kmalloc_array(ATMEL_SERIAL_RINGSIZE, - sizeof(struct atmel_uart_char), - GFP_KERNEL); + data = kmalloc(ATMEL_SERIAL_RX_SIZE, GFP_KERNEL); if (!data) goto err_clk_disable_unprepare; atmel_port->rx_ring.buf = data; diff --git a/drivers/tty/serial/clps711x.c b/drivers/tty/serial/clps711x.c index 7927725b89..30425a3d19 100644 --- a/drivers/tty/serial/clps711x.c +++ b/drivers/tty/serial/clps711x.c @@ -146,7 +146,8 @@ static irqreturn_t uart_clps711x_int_tx(int irq, void *dev_id) { struct uart_port *port = dev_id; struct clps711x_port *s = dev_get_drvdata(port->dev); - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; + unsigned char c; if (port->x_char) { writew(port->x_char, port->membase + UARTDR_OFFSET); @@ -155,7 +156,7 @@ static irqreturn_t uart_clps711x_int_tx(int irq, void *dev_id) return IRQ_HANDLED; } - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { + if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) { if (s->tx_enabled) { disable_irq_nosync(port->irq); s->tx_enabled = 0; @@ -163,18 +164,17 @@ static irqreturn_t uart_clps711x_int_tx(int irq, void *dev_id) return IRQ_HANDLED; } - while (!uart_circ_empty(xmit)) { + while (uart_fifo_get(port, &c)) { u32 sysflg = 0; - writew(xmit->buf[xmit->tail], port->membase + UARTDR_OFFSET); - uart_xmit_advance(port, 1); + writew(c, port->membase + UARTDR_OFFSET); regmap_read(s->syscon, SYSFLG_OFFSET, &sysflg); if (sysflg & SYSFLG_UTXFF) break; } - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); return IRQ_HANDLED; diff --git a/drivers/tty/serial/cpm_uart.c b/drivers/tty/serial/cpm_uart.c index df56c6c5af..a927478f58 100644 --- a/drivers/tty/serial/cpm_uart.c +++ b/drivers/tty/serial/cpm_uart.c @@ -648,7 +648,7 @@ static int cpm_uart_tx_pump(struct uart_port *port) int count; struct uart_cpm_port *pinfo = container_of(port, struct uart_cpm_port, port); - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; /* Handle xon/xoff */ if (port->x_char) { @@ -673,7 +673,7 @@ static int cpm_uart_tx_pump(struct uart_port *port) return 1; } - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { + if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) { cpm_uart_stop_tx(port); return 0; } @@ -681,16 +681,10 @@ static int cpm_uart_tx_pump(struct uart_port *port) /* Pick next descriptor and fill from buffer */ bdp = pinfo->tx_cur; - while (!(in_be16(&bdp->cbd_sc) & BD_SC_READY) && !uart_circ_empty(xmit)) { - count = 0; + while (!(in_be16(&bdp->cbd_sc) & BD_SC_READY) && + !kfifo_is_empty(&tport->xmit_fifo)) { p = cpm2cpu_addr(in_be32(&bdp->cbd_bufaddr), pinfo); - while (count < pinfo->tx_fifosize) { - *p++ = xmit->buf[xmit->tail]; - uart_xmit_advance(port, 1); - count++; - if (uart_circ_empty(xmit)) - break; - } + count = uart_fifo_out(port, p, pinfo->tx_fifosize); out_be16(&bdp->cbd_datlen, count); setbits16(&bdp->cbd_sc, BD_SC_READY); /* Get next BD. */ @@ -701,10 +695,10 @@ static int cpm_uart_tx_pump(struct uart_port *port) } pinfo->tx_cur = bdp; - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); - if (uart_circ_empty(xmit)) { + if (kfifo_is_empty(&tport->xmit_fifo)) { cpm_uart_stop_tx(port); return 0; } diff --git a/drivers/tty/serial/digicolor-usart.c b/drivers/tty/serial/digicolor-usart.c index e419c4bde8..2ccd13cc0a 100644 --- a/drivers/tty/serial/digicolor-usart.c +++ b/drivers/tty/serial/digicolor-usart.c @@ -179,8 +179,9 @@ static void digicolor_uart_rx(struct uart_port *port) static void digicolor_uart_tx(struct uart_port *port) { - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; unsigned long flags; + unsigned char c; if (digicolor_uart_tx_full(port)) return; @@ -194,20 +195,19 @@ static void digicolor_uart_tx(struct uart_port *port) goto out; } - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { + if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) { digicolor_uart_stop_tx(port); goto out; } - while (!uart_circ_empty(xmit)) { - writeb(xmit->buf[xmit->tail], port->membase + UA_EMI_REC); - uart_xmit_advance(port, 1); + while (uart_fifo_get(port, &c)) { + writeb(c, port->membase + UA_EMI_REC); if (digicolor_uart_tx_full(port)) break; } - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); out: diff --git a/drivers/tty/serial/dz.c b/drivers/tty/serial/dz.c index 6df7af9edc..eba91daede 100644 --- a/drivers/tty/serial/dz.c +++ b/drivers/tty/serial/dz.c @@ -252,13 +252,13 @@ static inline void dz_receive_chars(struct dz_mux *mux) static inline void dz_transmit_chars(struct dz_mux *mux) { struct dz_port *dport = &mux->dport[0]; - struct circ_buf *xmit; + struct tty_port *tport; unsigned char tmp; u16 status; status = dz_in(dport, DZ_CSR); dport = &mux->dport[LINE(status)]; - xmit = &dport->port.state->xmit; + tport = &dport->port.state->port; if (dport->port.x_char) { /* XON/XOFF chars */ dz_out(dport, DZ_TDR, dport->port.x_char); @@ -267,7 +267,8 @@ static inline void dz_transmit_chars(struct dz_mux *mux) return; } /* If nothing to do or stopped or hardware stopped. */ - if (uart_circ_empty(xmit) || uart_tx_stopped(&dport->port)) { + if (uart_tx_stopped(&dport->port) || + !uart_fifo_get(&dport->port, &tmp)) { uart_port_lock(&dport->port); dz_stop_tx(&dport->port); uart_port_unlock(&dport->port); @@ -278,15 +279,13 @@ static inline void dz_transmit_chars(struct dz_mux *mux) * If something to do... (remember the dz has no output fifo, * so we go one char at a time) :-< */ - tmp = xmit->buf[xmit->tail]; dz_out(dport, DZ_TDR, tmp); - uart_xmit_advance(&dport->port, 1); - if (uart_circ_chars_pending(xmit) < DZ_WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < DZ_WAKEUP_CHARS) uart_write_wakeup(&dport->port); /* Are we are done. */ - if (uart_circ_empty(xmit)) { + if (kfifo_is_empty(&tport->xmit_fifo)) { uart_port_lock(&dport->port); dz_stop_tx(&dport->port); uart_port_unlock(&dport->port); diff --git a/drivers/tty/serial/fsl_linflexuart.c b/drivers/tty/serial/fsl_linflexuart.c index 5426322b5f..e972df4b18 100644 --- a/drivers/tty/serial/fsl_linflexuart.c +++ b/drivers/tty/serial/fsl_linflexuart.c @@ -174,17 +174,18 @@ static void linflex_put_char(struct uart_port *sport, unsigned char c) static inline void linflex_transmit_buffer(struct uart_port *sport) { - struct circ_buf *xmit = &sport->state->xmit; + struct tty_port *tport = &sport->state->port; + unsigned char c; - while (!uart_circ_empty(xmit)) { - linflex_put_char(sport, xmit->buf[xmit->tail]); - uart_xmit_advance(sport, 1); + while (uart_fifo_get(sport, &c)) { + linflex_put_char(sport, c); + sport->icount.tx++; } - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(sport); - if (uart_circ_empty(xmit)) + if (kfifo_is_empty(&tport->xmit_fifo)) linflex_stop_tx(sport); } @@ -200,7 +201,7 @@ static void linflex_start_tx(struct uart_port *port) static irqreturn_t linflex_txint(int irq, void *dev_id) { struct uart_port *sport = dev_id; - struct circ_buf *xmit = &sport->state->xmit; + struct tty_port *tport = &sport->state->port; unsigned long flags; uart_port_lock_irqsave(sport, &flags); @@ -210,7 +211,7 @@ static irqreturn_t linflex_txint(int irq, void *dev_id) goto out; } - if (uart_circ_empty(xmit) || uart_tx_stopped(sport)) { + if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(sport)) { linflex_stop_tx(sport); goto out; } diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index bbcbc91482..615291ea9b 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -7,6 +7,7 @@ #include <linux/bitfield.h> #include <linux/bits.h> +#include <linux/circ_buf.h> #include <linux/clk.h> #include <linux/console.h> #include <linux/delay.h> @@ -473,7 +474,7 @@ static void lpuart32_stop_rx(struct uart_port *port) static void lpuart_dma_tx(struct lpuart_port *sport) { - struct circ_buf *xmit = &sport->port.state->xmit; + struct tty_port *tport = &sport->port.state->port; struct scatterlist *sgl = sport->tx_sgl; struct device *dev = sport->port.dev; struct dma_chan *chan = sport->dma_tx_chan; @@ -482,18 +483,10 @@ static void lpuart_dma_tx(struct lpuart_port *sport) if (sport->dma_tx_in_progress) return; - sport->dma_tx_bytes = uart_circ_chars_pending(xmit); - - if (xmit->tail < xmit->head || xmit->head == 0) { - sport->dma_tx_nents = 1; - sg_init_one(sgl, xmit->buf + xmit->tail, sport->dma_tx_bytes); - } else { - sport->dma_tx_nents = 2; - sg_init_table(sgl, 2); - sg_set_buf(sgl, xmit->buf + xmit->tail, - UART_XMIT_SIZE - xmit->tail); - sg_set_buf(sgl + 1, xmit->buf, xmit->head); - } + sg_init_table(sgl, ARRAY_SIZE(sport->tx_sgl)); + sport->dma_tx_bytes = kfifo_len(&tport->xmit_fifo); + sport->dma_tx_nents = kfifo_dma_out_prepare(&tport->xmit_fifo, sgl, + ARRAY_SIZE(sport->tx_sgl), sport->dma_tx_bytes); ret = dma_map_sg(chan->device->dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE); @@ -521,14 +514,15 @@ static void lpuart_dma_tx(struct lpuart_port *sport) static bool lpuart_stopped_or_empty(struct uart_port *port) { - return uart_circ_empty(&port->state->xmit) || uart_tx_stopped(port); + return kfifo_is_empty(&port->state->port.xmit_fifo) || + uart_tx_stopped(port); } static void lpuart_dma_tx_complete(void *arg) { struct lpuart_port *sport = arg; struct scatterlist *sgl = &sport->tx_sgl[0]; - struct circ_buf *xmit = &sport->port.state->xmit; + struct tty_port *tport = &sport->port.state->port; struct dma_chan *chan = sport->dma_tx_chan; unsigned long flags; @@ -545,7 +539,7 @@ static void lpuart_dma_tx_complete(void *arg) sport->dma_tx_in_progress = false; uart_port_unlock_irqrestore(&sport->port, flags); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(&sport->port); if (waitqueue_active(&sport->dma_wait)) { @@ -756,8 +750,9 @@ static inline void lpuart_transmit_buffer(struct lpuart_port *sport) static inline void lpuart32_transmit_buffer(struct lpuart_port *sport) { - struct circ_buf *xmit = &sport->port.state->xmit; + struct tty_port *tport = &sport->port.state->port; unsigned long txcnt; + unsigned char c; if (sport->port.x_char) { lpuart32_write(&sport->port, sport->port.x_char, UARTDATA); @@ -774,18 +769,18 @@ static inline void lpuart32_transmit_buffer(struct lpuart_port *sport) txcnt = lpuart32_read(&sport->port, UARTWATER); txcnt = txcnt >> UARTWATER_TXCNT_OFF; txcnt &= UARTWATER_COUNT_MASK; - while (!uart_circ_empty(xmit) && (txcnt < sport->txfifo_size)) { - lpuart32_write(&sport->port, xmit->buf[xmit->tail], UARTDATA); - uart_xmit_advance(&sport->port, 1); + while (txcnt < sport->txfifo_size && + uart_fifo_get(&sport->port, &c)) { + lpuart32_write(&sport->port, c, UARTDATA); txcnt = lpuart32_read(&sport->port, UARTWATER); txcnt = txcnt >> UARTWATER_TXCNT_OFF; txcnt &= UARTWATER_COUNT_MASK; } - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(&sport->port); - if (uart_circ_empty(xmit)) + if (kfifo_is_empty(&tport->xmit_fifo)) lpuart32_stop_tx(&sport->port); } @@ -2884,8 +2879,7 @@ static int lpuart_probe(struct platform_device *pdev) sport->ipg_clk = devm_clk_get(&pdev->dev, "ipg"); if (IS_ERR(sport->ipg_clk)) { ret = PTR_ERR(sport->ipg_clk); - dev_err(&pdev->dev, "failed to get uart ipg clk: %d\n", ret); - return ret; + return dev_err_probe(&pdev->dev, ret, "failed to get uart ipg clk\n"); } sport->baud_clk = NULL; @@ -2893,8 +2887,7 @@ static int lpuart_probe(struct platform_device *pdev) sport->baud_clk = devm_clk_get(&pdev->dev, "baud"); if (IS_ERR(sport->baud_clk)) { ret = PTR_ERR(sport->baud_clk); - dev_err(&pdev->dev, "failed to get uart baud clk: %d\n", ret); - return ret; + return dev_err_probe(&pdev->dev, ret, "failed to get uart baud clk\n"); } } diff --git a/drivers/tty/serial/icom.c b/drivers/tty/serial/icom.c index a75eafbcbe..29e42831df 100644 --- a/drivers/tty/serial/icom.c +++ b/drivers/tty/serial/icom.c @@ -877,10 +877,10 @@ unlock: static int icom_write(struct uart_port *port) { struct icom_port *icom_port = to_icom_port(port); + struct tty_port *tport = &port->state->port; unsigned long data_count; unsigned char cmdReg; unsigned long offset; - int temp_tail = port->state->xmit.tail; trace(icom_port, "WRITE", 0); @@ -890,16 +890,8 @@ static int icom_write(struct uart_port *port) return 0; } - data_count = 0; - while ((port->state->xmit.head != temp_tail) && - (data_count <= XMIT_BUFF_SZ)) { - - icom_port->xmit_buf[data_count++] = - port->state->xmit.buf[temp_tail]; - - temp_tail++; - temp_tail &= (UART_XMIT_SIZE - 1); - } + data_count = kfifo_out_peek(&tport->xmit_fifo, icom_port->xmit_buf, + XMIT_BUFF_SZ); if (data_count) { icom_port->statStg->xmit[0].flags = @@ -956,7 +948,8 @@ static inline void check_modem_status(struct icom_port *icom_port) static void xmit_interrupt(u16 port_int_reg, struct icom_port *icom_port) { - u16 count, i; + struct tty_port *tport = &icom_port->uart_port.state->port; + u16 count; if (port_int_reg & (INT_XMIT_COMPLETED)) { trace(icom_port, "XMIT_COMPLETE", 0); @@ -968,13 +961,7 @@ static void xmit_interrupt(u16 port_int_reg, struct icom_port *icom_port) count = le16_to_cpu(icom_port->statStg->xmit[0].leLength); icom_port->uart_port.icount.tx += count; - for (i=0; i<count && - !uart_circ_empty(&icom_port->uart_port.state->xmit); i++) { - - icom_port->uart_port.state->xmit.tail++; - icom_port->uart_port.state->xmit.tail &= - (UART_XMIT_SIZE - 1); - } + kfifo_skip_count(&tport->xmit_fifo, count); if (!icom_write(&icom_port->uart_port)) /* activate write queue */ diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 8fde71138c..ff32cd2d28 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -8,6 +8,7 @@ * Copyright (C) 2004 Pengutronix */ +#include <linux/circ_buf.h> #include <linux/module.h> #include <linux/ioport.h> #include <linux/init.h> @@ -523,7 +524,8 @@ static void imx_uart_dma_tx(struct imx_port *sport); /* called with port.lock taken and irqs off */ static inline void imx_uart_transmit_buffer(struct imx_port *sport) { - struct circ_buf *xmit = &sport->port.state->xmit; + struct tty_port *tport = &sport->port.state->port; + unsigned char c; if (sport->port.x_char) { /* Send next char */ @@ -533,7 +535,8 @@ static inline void imx_uart_transmit_buffer(struct imx_port *sport) return; } - if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) { + if (kfifo_is_empty(&tport->xmit_fifo) || + uart_tx_stopped(&sport->port)) { imx_uart_stop_tx(&sport->port); return; } @@ -557,26 +560,22 @@ static inline void imx_uart_transmit_buffer(struct imx_port *sport) return; } - while (!uart_circ_empty(xmit) && - !(imx_uart_readl(sport, imx_uart_uts_reg(sport)) & UTS_TXFULL)) { - /* send xmit->buf[xmit->tail] - * out the port here */ - imx_uart_writel(sport, xmit->buf[xmit->tail], URTX0); - uart_xmit_advance(&sport->port, 1); - } + while (!(imx_uart_readl(sport, imx_uart_uts_reg(sport)) & UTS_TXFULL) && + uart_fifo_get(&sport->port, &c)) + imx_uart_writel(sport, c, URTX0); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(&sport->port); - if (uart_circ_empty(xmit)) + if (kfifo_is_empty(&tport->xmit_fifo)) imx_uart_stop_tx(&sport->port); } static void imx_uart_dma_tx_callback(void *data) { struct imx_port *sport = data; + struct tty_port *tport = &sport->port.state->port; struct scatterlist *sgl = &sport->tx_sgl[0]; - struct circ_buf *xmit = &sport->port.state->xmit; unsigned long flags; u32 ucr1; @@ -594,10 +593,11 @@ static void imx_uart_dma_tx_callback(void *data) sport->dma_is_txing = 0; - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(&sport->port); - if (!uart_circ_empty(xmit) && !uart_tx_stopped(&sport->port)) + if (!kfifo_is_empty(&tport->xmit_fifo) && + !uart_tx_stopped(&sport->port)) imx_uart_dma_tx(sport); else if (sport->port.rs485.flags & SER_RS485_ENABLED) { u32 ucr4 = imx_uart_readl(sport, UCR4); @@ -611,7 +611,7 @@ static void imx_uart_dma_tx_callback(void *data) /* called with port.lock taken and irqs off */ static void imx_uart_dma_tx(struct imx_port *sport) { - struct circ_buf *xmit = &sport->port.state->xmit; + struct tty_port *tport = &sport->port.state->port; struct scatterlist *sgl = sport->tx_sgl; struct dma_async_tx_descriptor *desc; struct dma_chan *chan = sport->dma_chan_tx; @@ -626,18 +626,10 @@ static void imx_uart_dma_tx(struct imx_port *sport) ucr4 &= ~UCR4_TCEN; imx_uart_writel(sport, ucr4, UCR4); - sport->tx_bytes = uart_circ_chars_pending(xmit); - - if (xmit->tail < xmit->head || xmit->head == 0) { - sport->dma_tx_nents = 1; - sg_init_one(sgl, xmit->buf + xmit->tail, sport->tx_bytes); - } else { - sport->dma_tx_nents = 2; - sg_init_table(sgl, 2); - sg_set_buf(sgl, xmit->buf + xmit->tail, - UART_XMIT_SIZE - xmit->tail); - sg_set_buf(sgl + 1, xmit->buf, xmit->head); - } + sg_init_table(sgl, ARRAY_SIZE(sport->tx_sgl)); + sport->tx_bytes = kfifo_len(&tport->xmit_fifo); + sport->dma_tx_nents = kfifo_dma_out_prepare(&tport->xmit_fifo, sgl, + ARRAY_SIZE(sport->tx_sgl), sport->tx_bytes); ret = dma_map_sg(dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE); if (ret == 0) { @@ -655,8 +647,7 @@ static void imx_uart_dma_tx(struct imx_port *sport) desc->callback = imx_uart_dma_tx_callback; desc->callback_param = sport; - dev_dbg(dev, "TX: prepare to send %lu bytes by DMA.\n", - uart_circ_chars_pending(xmit)); + dev_dbg(dev, "TX: prepare to send %u bytes by DMA.\n", sport->tx_bytes); ucr1 = imx_uart_readl(sport, UCR1); ucr1 |= UCR1_TXDMAEN; @@ -673,9 +664,10 @@ static void imx_uart_dma_tx(struct imx_port *sport) static void imx_uart_start_tx(struct uart_port *port) { struct imx_port *sport = (struct imx_port *)port; + struct tty_port *tport = &sport->port.state->port; u32 ucr1; - if (!sport->port.x_char && uart_circ_empty(&port->state->xmit)) + if (!sport->port.x_char && kfifo_is_empty(&tport->xmit_fifo)) return; /* @@ -751,7 +743,7 @@ static void imx_uart_start_tx(struct uart_port *port) return; } - if (!uart_circ_empty(&port->state->xmit) && + if (!kfifo_is_empty(&tport->xmit_fifo) && !uart_tx_stopped(port)) imx_uart_dma_tx(sport); return; diff --git a/drivers/tty/serial/ip22zilog.c b/drivers/tty/serial/ip22zilog.c index 320b29cd46..c2cae50f06 100644 --- a/drivers/tty/serial/ip22zilog.c +++ b/drivers/tty/serial/ip22zilog.c @@ -355,7 +355,8 @@ static void ip22zilog_status_handle(struct uart_ip22zilog_port *up, static void ip22zilog_transmit_chars(struct uart_ip22zilog_port *up, struct zilog_channel *channel) { - struct circ_buf *xmit; + struct tty_port *tport; + unsigned char c; if (ZS_IS_CONS(up)) { unsigned char status = readb(&channel->control); @@ -398,20 +399,18 @@ static void ip22zilog_transmit_chars(struct uart_ip22zilog_port *up, if (up->port.state == NULL) goto ack_tx_int; - xmit = &up->port.state->xmit; - if (uart_circ_empty(xmit)) - goto ack_tx_int; + tport = &up->port.state->port; if (uart_tx_stopped(&up->port)) goto ack_tx_int; + if (!uart_fifo_get(&up->port, &c)) + goto ack_tx_int; up->flags |= IP22ZILOG_FLAG_TX_ACTIVE; - writeb(xmit->buf[xmit->tail], &channel->data); + writeb(c, &channel->data); ZSDELAY(); ZS_WSYNC(channel); - uart_xmit_advance(&up->port, 1); - - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(&up->port); return; @@ -600,17 +599,16 @@ static void ip22zilog_start_tx(struct uart_port *port) port->icount.tx++; port->x_char = 0; } else { - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; + unsigned char c; - if (uart_circ_empty(xmit)) + if (!uart_fifo_get(port, &c)) return; - writeb(xmit->buf[xmit->tail], &channel->data); + writeb(c, &channel->data); ZSDELAY(); ZS_WSYNC(channel); - uart_xmit_advance(port, 1); - - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(&up->port); } } diff --git a/drivers/tty/serial/jsm/jsm_cls.c b/drivers/tty/serial/jsm/jsm_cls.c index ddbd42c096..6e40792f92 100644 --- a/drivers/tty/serial/jsm/jsm_cls.c +++ b/drivers/tty/serial/jsm/jsm_cls.c @@ -443,20 +443,14 @@ static void cls_copy_data_from_uart_to_queue(struct jsm_channel *ch) static void cls_copy_data_from_queue_to_uart(struct jsm_channel *ch) { - u16 tail; + struct tty_port *tport; int n; - int qlen; u32 len_written = 0; - struct circ_buf *circ; if (!ch) return; - circ = &ch->uart_port.state->xmit; - - /* No data to write to the UART */ - if (uart_circ_empty(circ)) - return; + tport = &ch->uart_port.state->port; /* If port is "stopped", don't send any data to the UART */ if ((ch->ch_flags & CH_STOP) || (ch->ch_flags & CH_BREAK_SENDING)) @@ -467,29 +461,22 @@ static void cls_copy_data_from_queue_to_uart(struct jsm_channel *ch) return; n = 32; + while (n > 0) { + unsigned char c; - /* cache tail of queue */ - tail = circ->tail & (UART_XMIT_SIZE - 1); - qlen = uart_circ_chars_pending(circ); - - /* Find minimum of the FIFO space, versus queue length */ - n = min(n, qlen); + if (!kfifo_get(&tport->xmit_fifo, &c)) + break; - while (n > 0) { - writeb(circ->buf[tail], &ch->ch_cls_uart->txrx); - tail = (tail + 1) & (UART_XMIT_SIZE - 1); + writeb(c, &ch->ch_cls_uart->txrx); n--; ch->ch_txcount++; len_written++; } - /* Update the final tail */ - circ->tail = tail & (UART_XMIT_SIZE - 1); - if (len_written > ch->ch_t_tlevel) ch->ch_flags &= ~(CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM); - if (uart_circ_empty(circ)) + if (kfifo_is_empty(&tport->xmit_fifo)) uart_write_wakeup(&ch->uart_port); } diff --git a/drivers/tty/serial/jsm/jsm_neo.c b/drivers/tty/serial/jsm/jsm_neo.c index 1fa10f1936..e8e13bf056 100644 --- a/drivers/tty/serial/jsm/jsm_neo.c +++ b/drivers/tty/serial/jsm/jsm_neo.c @@ -474,21 +474,21 @@ static void neo_copy_data_from_uart_to_queue(struct jsm_channel *ch) static void neo_copy_data_from_queue_to_uart(struct jsm_channel *ch) { - u16 head; - u16 tail; + struct tty_port *tport; + unsigned char *tail; + unsigned char c; int n; int s; int qlen; u32 len_written = 0; - struct circ_buf *circ; if (!ch) return; - circ = &ch->uart_port.state->xmit; + tport = &ch->uart_port.state->port; /* No data to write to the UART */ - if (uart_circ_empty(circ)) + if (kfifo_is_empty(&tport->xmit_fifo)) return; /* If port is "stopped", don't send any data to the UART */ @@ -504,10 +504,9 @@ static void neo_copy_data_from_queue_to_uart(struct jsm_channel *ch) if (ch->ch_cached_lsr & UART_LSR_THRE) { ch->ch_cached_lsr &= ~(UART_LSR_THRE); - writeb(circ->buf[circ->tail], &ch->ch_neo_uart->txrx); - jsm_dbg(WRITE, &ch->ch_bd->pci_dev, - "Tx data: %x\n", circ->buf[circ->tail]); - circ->tail = (circ->tail + 1) & (UART_XMIT_SIZE - 1); + WARN_ON_ONCE(!kfifo_get(&tport->xmit_fifo, &c)); + writeb(c, &ch->ch_neo_uart->txrx); + jsm_dbg(WRITE, &ch->ch_bd->pci_dev, "Tx data: %x\n", c); ch->ch_txcount++; } return; @@ -520,38 +519,27 @@ static void neo_copy_data_from_queue_to_uart(struct jsm_channel *ch) return; n = UART_17158_TX_FIFOSIZE - ch->ch_t_tlevel; - - /* cache head and tail of queue */ - head = circ->head & (UART_XMIT_SIZE - 1); - tail = circ->tail & (UART_XMIT_SIZE - 1); - qlen = uart_circ_chars_pending(circ); + qlen = kfifo_len(&tport->xmit_fifo); /* Find minimum of the FIFO space, versus queue length */ n = min(n, qlen); while (n > 0) { - - s = ((head >= tail) ? head : UART_XMIT_SIZE) - tail; - s = min(s, n); - + s = kfifo_out_linear_ptr(&tport->xmit_fifo, &tail, n); if (s <= 0) break; - memcpy_toio(&ch->ch_neo_uart->txrxburst, circ->buf + tail, s); - /* Add and flip queue if needed */ - tail = (tail + s) & (UART_XMIT_SIZE - 1); + memcpy_toio(&ch->ch_neo_uart->txrxburst, tail, s); + kfifo_skip_count(&tport->xmit_fifo, s); n -= s; ch->ch_txcount += s; len_written += s; } - /* Update the final tail */ - circ->tail = tail & (UART_XMIT_SIZE - 1); - if (len_written >= ch->ch_t_tlevel) ch->ch_flags &= ~(CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM); - if (uart_circ_empty(circ)) + if (kfifo_is_empty(&tport->xmit_fifo)) uart_write_wakeup(&ch->uart_port); } diff --git a/drivers/tty/serial/max3100.c b/drivers/tty/serial/max3100.c index 3d2b83d6ab..fda63918d1 100644 --- a/drivers/tty/serial/max3100.c +++ b/drivers/tty/serial/max3100.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: GPL-2.0+ /* - * * Copyright (C) 2008 Christian Pellegrin <chripell@evolware.org> * * Notes: the MAX3100 doesn't provide an interrupt on CTS so we have @@ -8,24 +7,6 @@ * writing conf clears FIFO buffer and we cannot have this interrupt * always asking us for attention. * - * Example platform data: - - static struct plat_max3100 max3100_plat_data = { - .loopback = 0, - .crystal = 0, - .poll_time = 100, - }; - - static struct spi_board_info spi_board_info[] = { - { - .modalias = "max3100", - .platform_data = &max3100_plat_data, - .irq = IRQ_EINT12, - .max_speed_hz = 5*1000*1000, - .chip_select = 0, - }, - }; - * The initial minor number is 209 in the low-density serial port: * mknod /dev/ttyMAX0 c 204 209 */ @@ -35,22 +16,24 @@ /* 4 MAX3100s should be enough for everyone */ #define MAX_MAX3100 4 +#include <linux/container_of.h> #include <linux/delay.h> -#include <linux/slab.h> #include <linux/device.h> +#include <linux/freezer.h> +#include <linux/mod_devicetable.h> #include <linux/module.h> +#include <linux/pm.h> +#include <linux/property.h> #include <linux/serial_core.h> #include <linux/serial.h> +#include <linux/slab.h> #include <linux/spi/spi.h> -#include <linux/freezer.h> -#include <linux/tty.h> #include <linux/tty_flip.h> +#include <linux/tty.h> #include <linux/types.h> #include <asm/unaligned.h> -#include <linux/serial_max3100.h> - #define MAX3100_C (1<<14) #define MAX3100_D (0<<14) #define MAX3100_W (1<<15) @@ -113,10 +96,8 @@ struct max3100_port { #define MAX3100_7BIT 4 int rx_enabled; /* if we should rx chars */ - int irq; /* irq assigned to the max3100 */ - int minor; /* minor number */ - int crystal; /* 1 if 3.6864Mhz crystal 0 for 1.8432 */ + int loopback_commit; /* need to change loopback */ int loopback; /* 1 if we are in loopback mode */ /* for handling irqs: need workqueue since we do spi_sync */ @@ -127,15 +108,14 @@ struct max3100_port { /* need to know we are suspending to avoid deadlock on workqueue */ int suspending; - /* hook for suspending MAX3100 via dedicated pin */ - void (*max3100_hw_suspend) (int suspend); - - /* poll time (in ms) for ctrl lines */ - int poll_time; - /* and its timer */ struct timer_list timer; }; +static inline struct max3100_port *to_max3100_port(struct uart_port *port) +{ + return container_of(port, struct max3100_port, port); +} + static struct max3100_port *max3100s[MAX_MAX3100]; /* the chips */ static DEFINE_MUTEX(max3100s_lock); /* race on probe */ @@ -173,24 +153,6 @@ static void max3100_calc_parity(struct max3100_port *s, u16 *c) *c |= max3100_do_parity(s, *c) << 8; } -static void max3100_work(struct work_struct *w); - -static void max3100_dowork(struct max3100_port *s) -{ - if (!s->force_end_work && !freezing(current) && !s->suspending) - queue_work(s->workqueue, &s->work); -} - -static void max3100_timeout(struct timer_list *t) -{ - struct max3100_port *s = from_timer(s, t, timer); - - if (s->port.state) { - max3100_dowork(s); - mod_timer(&s->timer, jiffies + s->poll_time); - } -} - static int max3100_sr(struct max3100_port *s, u16 tx, u16 *rx) { struct spi_message message; @@ -271,10 +233,11 @@ static int max3100_handlerx(struct max3100_port *s, u16 rx) static void max3100_work(struct work_struct *w) { struct max3100_port *s = container_of(w, struct max3100_port, work); + struct tty_port *tport = &s->port.state->port; + unsigned char ch; + int conf, cconf, cloopback, crts; int rxchars; u16 tx, rx; - int conf, cconf, crts; - struct circ_buf *xmit = &s->port.state->xmit; dev_dbg(&s->spi->dev, "%s\n", __func__); @@ -284,11 +247,15 @@ static void max3100_work(struct work_struct *w) conf = s->conf; cconf = s->conf_commit; s->conf_commit = 0; + cloopback = s->loopback_commit; + s->loopback_commit = 0; crts = s->rts_commit; s->rts_commit = 0; spin_unlock(&s->conf_lock); if (cconf) max3100_sr(s, MAX3100_WC | conf, &rx); + if (cloopback) + max3100_sr(s, 0x4001, &rx); if (crts) { max3100_sr(s, MAX3100_WD | MAX3100_TE | (s->rts ? MAX3100_RTS : 0), &rx); @@ -304,10 +271,9 @@ static void max3100_work(struct work_struct *w) tx = s->port.x_char; s->port.icount.tx++; s->port.x_char = 0; - } else if (!uart_circ_empty(xmit) && - !uart_tx_stopped(&s->port)) { - tx = xmit->buf[xmit->tail]; - uart_xmit_advance(&s->port, 1); + } else if (!uart_tx_stopped(&s->port) && + uart_fifo_get(&s->port, &ch)) { + tx = ch; } if (tx != 0xffff) { max3100_calc_parity(s, &tx); @@ -321,19 +287,33 @@ static void max3100_work(struct work_struct *w) tty_flip_buffer_push(&s->port.state->port); rxchars = 0; } - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(&s->port); } while (!s->force_end_work && !freezing(current) && ((rx & MAX3100_R) || - (!uart_circ_empty(xmit) && + (!kfifo_is_empty(&tport->xmit_fifo) && !uart_tx_stopped(&s->port)))); if (rxchars > 0) tty_flip_buffer_push(&s->port.state->port); } +static void max3100_dowork(struct max3100_port *s) +{ + if (!s->force_end_work && !freezing(current) && !s->suspending) + queue_work(s->workqueue, &s->work); +} + +static void max3100_timeout(struct timer_list *t) +{ + struct max3100_port *s = from_timer(s, t, timer); + + max3100_dowork(s); + mod_timer(&s->timer, jiffies + uart_poll_timeout(&s->port)); +} + static irqreturn_t max3100_irq(int irqno, void *dev_id) { struct max3100_port *s = dev_id; @@ -346,20 +326,15 @@ static irqreturn_t max3100_irq(int irqno, void *dev_id) static void max3100_enable_ms(struct uart_port *port) { - struct max3100_port *s = container_of(port, - struct max3100_port, - port); + struct max3100_port *s = to_max3100_port(port); - if (s->poll_time > 0) - mod_timer(&s->timer, jiffies); + mod_timer(&s->timer, jiffies); dev_dbg(&s->spi->dev, "%s\n", __func__); } static void max3100_start_tx(struct uart_port *port) { - struct max3100_port *s = container_of(port, - struct max3100_port, - port); + struct max3100_port *s = to_max3100_port(port); dev_dbg(&s->spi->dev, "%s\n", __func__); @@ -368,9 +343,7 @@ static void max3100_start_tx(struct uart_port *port) static void max3100_stop_rx(struct uart_port *port) { - struct max3100_port *s = container_of(port, - struct max3100_port, - port); + struct max3100_port *s = to_max3100_port(port); dev_dbg(&s->spi->dev, "%s\n", __func__); @@ -384,9 +357,7 @@ static void max3100_stop_rx(struct uart_port *port) static unsigned int max3100_tx_empty(struct uart_port *port) { - struct max3100_port *s = container_of(port, - struct max3100_port, - port); + struct max3100_port *s = to_max3100_port(port); dev_dbg(&s->spi->dev, "%s\n", __func__); @@ -397,9 +368,7 @@ static unsigned int max3100_tx_empty(struct uart_port *port) static unsigned int max3100_get_mctrl(struct uart_port *port) { - struct max3100_port *s = container_of(port, - struct max3100_port, - port); + struct max3100_port *s = to_max3100_port(port); dev_dbg(&s->spi->dev, "%s\n", __func__); @@ -411,21 +380,25 @@ static unsigned int max3100_get_mctrl(struct uart_port *port) static void max3100_set_mctrl(struct uart_port *port, unsigned int mctrl) { - struct max3100_port *s = container_of(port, - struct max3100_port, - port); - int rts; + struct max3100_port *s = to_max3100_port(port); + int loopback, rts; dev_dbg(&s->spi->dev, "%s\n", __func__); + loopback = (mctrl & TIOCM_LOOP) > 0; rts = (mctrl & TIOCM_RTS) > 0; spin_lock(&s->conf_lock); + if (s->loopback != loopback) { + s->loopback = loopback; + s->loopback_commit = 1; + } if (s->rts != rts) { s->rts = rts; s->rts_commit = 1; - max3100_dowork(s); } + if (s->loopback_commit || s->rts_commit) + max3100_dowork(s); spin_unlock(&s->conf_lock); } @@ -433,10 +406,9 @@ static void max3100_set_termios(struct uart_port *port, struct ktermios *termios, const struct ktermios *old) { - struct max3100_port *s = container_of(port, - struct max3100_port, - port); - int baud = 0; + struct max3100_port *s = to_max3100_port(port); + unsigned int baud = port->uartclk / 16; + unsigned int baud230400 = (baud == 230400) ? 1 : 0; unsigned cflag; u32 param_new, param_mask, parity = 0; @@ -449,40 +421,40 @@ max3100_set_termios(struct uart_port *port, struct ktermios *termios, param_new = s->conf & MAX3100_BAUD; switch (baud) { case 300: - if (s->crystal) + if (baud230400) baud = s->baud; else param_new = 15; break; case 600: - param_new = 14 + s->crystal; + param_new = 14 + baud230400; break; case 1200: - param_new = 13 + s->crystal; + param_new = 13 + baud230400; break; case 2400: - param_new = 12 + s->crystal; + param_new = 12 + baud230400; break; case 4800: - param_new = 11 + s->crystal; + param_new = 11 + baud230400; break; case 9600: - param_new = 10 + s->crystal; + param_new = 10 + baud230400; break; case 19200: - param_new = 9 + s->crystal; + param_new = 9 + baud230400; break; case 38400: - param_new = 8 + s->crystal; + param_new = 8 + baud230400; break; case 57600: - param_new = 1 + s->crystal; + param_new = 1 + baud230400; break; case 115200: - param_new = 0 + s->crystal; + param_new = 0 + baud230400; break; case 230400: - if (s->crystal) + if (baud230400) param_new = 0; else baud = s->baud; @@ -534,9 +506,7 @@ max3100_set_termios(struct uart_port *port, struct ktermios *termios, MAX3100_STATUS_PE | MAX3100_STATUS_FE | MAX3100_STATUS_OE; - if (s->poll_time > 0) - del_timer_sync(&s->timer); - + del_timer_sync(&s->timer); uart_update_timeout(port, termios->c_cflag, baud); spin_lock(&s->conf_lock); @@ -552,9 +522,8 @@ max3100_set_termios(struct uart_port *port, struct ktermios *termios, static void max3100_shutdown(struct uart_port *port) { - struct max3100_port *s = container_of(port, - struct max3100_port, - port); + struct max3100_port *s = to_max3100_port(port); + u16 rx; dev_dbg(&s->spi->dev, "%s\n", __func__); @@ -563,38 +532,29 @@ static void max3100_shutdown(struct uart_port *port) s->force_end_work = 1; - if (s->poll_time > 0) - del_timer_sync(&s->timer); + del_timer_sync(&s->timer); if (s->workqueue) { destroy_workqueue(s->workqueue); s->workqueue = NULL; } - if (s->irq) - free_irq(s->irq, s); + if (port->irq) + free_irq(port->irq, s); /* set shutdown mode to save power */ - if (s->max3100_hw_suspend) - s->max3100_hw_suspend(1); - else { - u16 tx, rx; - - tx = MAX3100_WC | MAX3100_SHDN; - max3100_sr(s, tx, &rx); - } + max3100_sr(s, MAX3100_WC | MAX3100_SHDN, &rx); } static int max3100_startup(struct uart_port *port) { - struct max3100_port *s = container_of(port, - struct max3100_port, - port); + struct max3100_port *s = to_max3100_port(port); char b[12]; + int ret; dev_dbg(&s->spi->dev, "%s\n", __func__); s->conf = MAX3100_RM; - s->baud = s->crystal ? 230400 : 115200; + s->baud = port->uartclk / 16; s->rx_enabled = 1; if (s->suspending) @@ -612,23 +572,15 @@ static int max3100_startup(struct uart_port *port) } INIT_WORK(&s->work, max3100_work); - if (request_irq(s->irq, max3100_irq, - IRQF_TRIGGER_FALLING, "max3100", s) < 0) { - dev_warn(&s->spi->dev, "cannot allocate irq %d\n", s->irq); - s->irq = 0; + ret = request_irq(port->irq, max3100_irq, IRQF_TRIGGER_FALLING, "max3100", s); + if (ret < 0) { + dev_warn(&s->spi->dev, "cannot allocate irq %d\n", port->irq); + port->irq = 0; destroy_workqueue(s->workqueue); s->workqueue = NULL; return -EBUSY; } - if (s->loopback) { - u16 tx, rx; - tx = 0x4001; - max3100_sr(s, tx, &rx); - } - - if (s->max3100_hw_suspend) - s->max3100_hw_suspend(0); s->conf_commit = 1; max3100_dowork(s); /* wait for clock to settle */ @@ -641,9 +593,7 @@ static int max3100_startup(struct uart_port *port) static const char *max3100_type(struct uart_port *port) { - struct max3100_port *s = container_of(port, - struct max3100_port, - port); + struct max3100_port *s = to_max3100_port(port); dev_dbg(&s->spi->dev, "%s\n", __func__); @@ -652,18 +602,14 @@ static const char *max3100_type(struct uart_port *port) static void max3100_release_port(struct uart_port *port) { - struct max3100_port *s = container_of(port, - struct max3100_port, - port); + struct max3100_port *s = to_max3100_port(port); dev_dbg(&s->spi->dev, "%s\n", __func__); } static void max3100_config_port(struct uart_port *port, int flags) { - struct max3100_port *s = container_of(port, - struct max3100_port, - port); + struct max3100_port *s = to_max3100_port(port); dev_dbg(&s->spi->dev, "%s\n", __func__); @@ -674,9 +620,7 @@ static void max3100_config_port(struct uart_port *port, int flags) static int max3100_verify_port(struct uart_port *port, struct serial_struct *ser) { - struct max3100_port *s = container_of(port, - struct max3100_port, - port); + struct max3100_port *s = to_max3100_port(port); int ret = -EINVAL; dev_dbg(&s->spi->dev, "%s\n", __func__); @@ -688,18 +632,14 @@ static int max3100_verify_port(struct uart_port *port, static void max3100_stop_tx(struct uart_port *port) { - struct max3100_port *s = container_of(port, - struct max3100_port, - port); + struct max3100_port *s = to_max3100_port(port); dev_dbg(&s->spi->dev, "%s\n", __func__); } static int max3100_request_port(struct uart_port *port) { - struct max3100_port *s = container_of(port, - struct max3100_port, - port); + struct max3100_port *s = to_max3100_port(port); dev_dbg(&s->spi->dev, "%s\n", __func__); return 0; @@ -707,9 +647,7 @@ static int max3100_request_port(struct uart_port *port) static void max3100_break_ctl(struct uart_port *port, int break_state) { - struct max3100_port *s = container_of(port, - struct max3100_port, - port); + struct max3100_port *s = to_max3100_port(port); dev_dbg(&s->spi->dev, "%s\n", __func__); } @@ -745,18 +683,17 @@ static int uart_driver_registered; static int max3100_probe(struct spi_device *spi) { + struct device *dev = &spi->dev; int i, retval; - struct plat_max3100 *pdata; - u16 tx, rx; + u16 rx; mutex_lock(&max3100s_lock); if (!uart_driver_registered) { retval = uart_register_driver(&max3100_uart_driver); if (retval) { - printk(KERN_ERR "Couldn't register max3100 uart driver\n"); mutex_unlock(&max3100s_lock); - return retval; + return dev_err_probe(dev, retval, "Couldn't register max3100 uart driver\n"); } uart_driver_registered = 1; @@ -766,54 +703,39 @@ static int max3100_probe(struct spi_device *spi) if (!max3100s[i]) break; if (i == MAX_MAX3100) { - dev_warn(&spi->dev, "too many MAX3100 chips\n"); mutex_unlock(&max3100s_lock); - return -ENOMEM; + return dev_err_probe(dev, -ENOMEM, "too many MAX3100 chips\n"); } max3100s[i] = kzalloc(sizeof(struct max3100_port), GFP_KERNEL); if (!max3100s[i]) { - dev_warn(&spi->dev, - "kmalloc for max3100 structure %d failed!\n", i); mutex_unlock(&max3100s_lock); return -ENOMEM; } max3100s[i]->spi = spi; - max3100s[i]->irq = spi->irq; spin_lock_init(&max3100s[i]->conf_lock); spi_set_drvdata(spi, max3100s[i]); - pdata = dev_get_platdata(&spi->dev); - max3100s[i]->crystal = pdata->crystal; - max3100s[i]->loopback = pdata->loopback; - max3100s[i]->poll_time = msecs_to_jiffies(pdata->poll_time); - if (pdata->poll_time > 0 && max3100s[i]->poll_time == 0) - max3100s[i]->poll_time = 1; - max3100s[i]->max3100_hw_suspend = pdata->max3100_hw_suspend; max3100s[i]->minor = i; timer_setup(&max3100s[i]->timer, max3100_timeout, 0); dev_dbg(&spi->dev, "%s: adding port %d\n", __func__, i); - max3100s[i]->port.irq = max3100s[i]->irq; - max3100s[i]->port.uartclk = max3100s[i]->crystal ? 3686400 : 1843200; + max3100s[i]->port.irq = spi->irq; max3100s[i]->port.fifosize = 16; max3100s[i]->port.ops = &max3100_ops; max3100s[i]->port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF; max3100s[i]->port.line = i; max3100s[i]->port.type = PORT_MAX3100; max3100s[i]->port.dev = &spi->dev; + + /* Read clock frequency from a property, uart_add_one_port() will fail if it's not set */ + device_property_read_u32(dev, "clock-frequency", &max3100s[i]->port.uartclk); + retval = uart_add_one_port(&max3100_uart_driver, &max3100s[i]->port); if (retval < 0) - dev_warn(&spi->dev, - "uart_add_one_port failed for line %d with error %d\n", - i, retval); + dev_err_probe(dev, retval, "uart_add_one_port failed for line %d\n", i); /* set shutdown mode to save power. Will be woken-up on open */ - if (max3100s[i]->max3100_hw_suspend) - max3100s[i]->max3100_hw_suspend(1); - else { - tx = MAX3100_WC | MAX3100_SHDN; - max3100_sr(max3100s[i], tx, &rx); - } + max3100_sr(max3100s[i], MAX3100_WC | MAX3100_SHDN, &rx); mutex_unlock(&max3100s_lock); return 0; } @@ -850,28 +772,20 @@ static void max3100_remove(struct spi_device *spi) mutex_unlock(&max3100s_lock); } -#ifdef CONFIG_PM_SLEEP - static int max3100_suspend(struct device *dev) { struct max3100_port *s = dev_get_drvdata(dev); + u16 rx; dev_dbg(&s->spi->dev, "%s\n", __func__); - disable_irq(s->irq); + disable_irq(s->port.irq); s->suspending = 1; uart_suspend_port(&max3100_uart_driver, &s->port); - if (s->max3100_hw_suspend) - s->max3100_hw_suspend(1); - else { - /* no HW suspend, so do SW one */ - u16 tx, rx; - - tx = MAX3100_WC | MAX3100_SHDN; - max3100_sr(s, tx, &rx); - } + /* no HW suspend, so do SW one */ + max3100_sr(s, MAX3100_WC | MAX3100_SHDN, &rx); return 0; } @@ -881,12 +795,10 @@ static int max3100_resume(struct device *dev) dev_dbg(&s->spi->dev, "%s\n", __func__); - if (s->max3100_hw_suspend) - s->max3100_hw_suspend(0); uart_resume_port(&max3100_uart_driver, &s->port); s->suspending = 0; - enable_irq(s->irq); + enable_irq(s->port.irq); s->conf_commit = 1; if (s->workqueue) @@ -895,20 +807,29 @@ static int max3100_resume(struct device *dev) return 0; } -static SIMPLE_DEV_PM_OPS(max3100_pm_ops, max3100_suspend, max3100_resume); -#define MAX3100_PM_OPS (&max3100_pm_ops) +static DEFINE_SIMPLE_DEV_PM_OPS(max3100_pm_ops, max3100_suspend, max3100_resume); -#else -#define MAX3100_PM_OPS NULL -#endif +static const struct spi_device_id max3100_spi_id[] = { + { "max3100" }, + { } +}; +MODULE_DEVICE_TABLE(spi, max3100_spi_id); + +static const struct of_device_id max3100_of_match[] = { + { .compatible = "maxim,max3100" }, + { } +}; +MODULE_DEVICE_TABLE(of, max3100_of_match); static struct spi_driver max3100_driver = { .driver = { .name = "max3100", - .pm = MAX3100_PM_OPS, + .of_match_table = max3100_of_match, + .pm = pm_sleep_ptr(&max3100_pm_ops), }, .probe = max3100_probe, .remove = max3100_remove, + .id_table = max3100_spi_id, }; module_spi_driver(max3100_driver); @@ -916,4 +837,3 @@ module_spi_driver(max3100_driver); MODULE_DESCRIPTION("MAX3100 driver"); MODULE_AUTHOR("Christian Pellegrin <chripell@evolware.org>"); MODULE_LICENSE("GPL"); -MODULE_ALIAS("spi:max3100"); diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c index 14dd9cfaa9..35369a2f77 100644 --- a/drivers/tty/serial/max310x.c +++ b/drivers/tty/serial/max310x.c @@ -747,8 +747,9 @@ static void max310x_handle_rx(struct uart_port *port, unsigned int rxlen) static void max310x_handle_tx(struct uart_port *port) { - struct circ_buf *xmit = &port->state->xmit; - unsigned int txlen, to_send, until_end; + struct tty_port *tport = &port->state->port; + unsigned int txlen, to_send; + unsigned char *tail; if (unlikely(port->x_char)) { max310x_port_write(port, MAX310X_THR_REG, port->x_char); @@ -757,32 +758,26 @@ static void max310x_handle_tx(struct uart_port *port) return; } - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) + if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) return; - /* Get length of data pending in circular buffer */ - to_send = uart_circ_chars_pending(xmit); - until_end = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); - if (likely(to_send)) { + /* + * It's a circ buffer -- wrap around. + * We could do that in one SPI transaction, but meh. + */ + while (!kfifo_is_empty(&tport->xmit_fifo)) { /* Limit to space available in TX FIFO */ txlen = max310x_port_read(port, MAX310X_TXFIFOLVL_REG); txlen = port->fifosize - txlen; - to_send = (to_send > txlen) ? txlen : to_send; - - if (until_end < to_send) { - /* - * It's a circ buffer -- wrap around. - * We could do that in one SPI transaction, but meh. - */ - max310x_batch_write(port, xmit->buf + xmit->tail, until_end); - max310x_batch_write(port, xmit->buf, to_send - until_end); - } else { - max310x_batch_write(port, xmit->buf + xmit->tail, to_send); - } + if (!txlen) + break; + + to_send = kfifo_out_linear_ptr(&tport->xmit_fifo, &tail, txlen); + max310x_batch_write(port, tail, to_send); uart_xmit_advance(port, to_send); } - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); } @@ -1478,7 +1473,7 @@ static struct regmap_config regcfg = { .reg_bits = 8, .val_bits = 8, .write_flag_mask = MAX310X_WRITE_BIT, - .cache_type = REGCACHE_RBTREE, + .cache_type = REGCACHE_MAPLE, .max_register = MAX310X_REG_1F, .writeable_reg = max310x_reg_writeable, .volatile_reg = max310x_reg_volatile, @@ -1582,7 +1577,7 @@ static int max310x_i2c_extended_reg_enable(struct device *dev, bool enable) static struct regmap_config regcfg_i2c = { .reg_bits = 8, .val_bits = 8, - .cache_type = REGCACHE_RBTREE, + .cache_type = REGCACHE_MAPLE, .writeable_reg = max310x_reg_writeable, .volatile_reg = max310x_reg_volatile, .precious_reg = max310x_reg_precious, diff --git a/drivers/tty/serial/men_z135_uart.c b/drivers/tty/serial/men_z135_uart.c index 8048fa542f..4bff422bb1 100644 --- a/drivers/tty/serial/men_z135_uart.c +++ b/drivers/tty/serial/men_z135_uart.c @@ -293,17 +293,14 @@ static void men_z135_handle_rx(struct men_z135_port *uart) static void men_z135_handle_tx(struct men_z135_port *uart) { struct uart_port *port = &uart->port; - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; + unsigned char *tail; + unsigned int n, txfree; u32 txc; u32 wptr; int qlen; - int n; - int txfree; - int head; - int tail; - int s; - if (uart_circ_empty(xmit)) + if (kfifo_is_empty(&tport->xmit_fifo)) goto out; if (uart_tx_stopped(port)) @@ -313,7 +310,7 @@ static void men_z135_handle_tx(struct men_z135_port *uart) goto out; /* calculate bytes to copy */ - qlen = uart_circ_chars_pending(xmit); + qlen = kfifo_len(&tport->xmit_fifo); if (qlen <= 0) goto out; @@ -345,21 +342,18 @@ static void men_z135_handle_tx(struct men_z135_port *uart) if (n <= 0) goto irq_en; - head = xmit->head & (UART_XMIT_SIZE - 1); - tail = xmit->tail & (UART_XMIT_SIZE - 1); - - s = ((head >= tail) ? head : UART_XMIT_SIZE) - tail; - n = min(n, s); + n = kfifo_out_linear_ptr(&tport->xmit_fifo, &tail, + min_t(unsigned int, UART_XMIT_SIZE, n)); + memcpy_toio(port->membase + MEN_Z135_TX_RAM, tail, n); - memcpy_toio(port->membase + MEN_Z135_TX_RAM, &xmit->buf[xmit->tail], n); iowrite32(n & 0x3ff, port->membase + MEN_Z135_TX_CTRL); uart_xmit_advance(port, n); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); irq_en: - if (!uart_circ_empty(xmit)) + if (!kfifo_is_empty(&tport->xmit_fifo)) men_z135_reg_set(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_TXCIEN); else men_z135_reg_clr(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_TXCIEN); diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c index 6feac459c0..8eb586ac3b 100644 --- a/drivers/tty/serial/meson_uart.c +++ b/drivers/tty/serial/meson_uart.c @@ -141,8 +141,8 @@ static void meson_uart_shutdown(struct uart_port *port) static void meson_uart_start_tx(struct uart_port *port) { - struct circ_buf *xmit = &port->state->xmit; - unsigned int ch; + struct tty_port *tport = &port->state->port; + unsigned char ch; u32 val; if (uart_tx_stopped(port)) { @@ -158,21 +158,19 @@ static void meson_uart_start_tx(struct uart_port *port) continue; } - if (uart_circ_empty(xmit)) + if (!uart_fifo_get(port, &ch)) break; - ch = xmit->buf[xmit->tail]; writel(ch, port->membase + AML_UART_WFIFO); - uart_xmit_advance(port, 1); } - if (!uart_circ_empty(xmit)) { + if (!kfifo_is_empty(&tport->xmit_fifo)) { val = readl(port->membase + AML_UART_CONTROL); val |= AML_UART_TX_INT_EN; writel(val, port->membase + AML_UART_CONTROL); } - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); } diff --git a/drivers/tty/serial/milbeaut_usio.c b/drivers/tty/serial/milbeaut_usio.c index da4c6f7e2a..fb082ee73d 100644 --- a/drivers/tty/serial/milbeaut_usio.c +++ b/drivers/tty/serial/milbeaut_usio.c @@ -72,7 +72,7 @@ static void mlb_usio_stop_tx(struct uart_port *port) static void mlb_usio_tx_chars(struct uart_port *port) { - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; int count; writew(readw(port->membase + MLB_USIO_REG_FCR) & ~MLB_USIO_FCR_FTIE, @@ -87,7 +87,7 @@ static void mlb_usio_tx_chars(struct uart_port *port) port->x_char = 0; return; } - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { + if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) { mlb_usio_stop_tx(port); return; } @@ -96,12 +96,13 @@ static void mlb_usio_tx_chars(struct uart_port *port) (readw(port->membase + MLB_USIO_REG_FBYTE) & 0xff); do { - writew(xmit->buf[xmit->tail], port->membase + MLB_USIO_REG_DR); + unsigned char ch; - uart_xmit_advance(port, 1); - if (uart_circ_empty(xmit)) + if (!uart_fifo_get(port, &ch)) break; + writew(ch, port->membase + MLB_USIO_REG_DR); + port->icount.tx++; } while (--count > 0); writew(readw(port->membase + MLB_USIO_REG_FCR) & ~MLB_USIO_FCR_FDRQ, @@ -110,10 +111,10 @@ static void mlb_usio_tx_chars(struct uart_port *port) writeb(readb(port->membase + MLB_USIO_REG_SCR) | MLB_USIO_SCR_TBIE, port->membase + MLB_USIO_REG_SCR); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); - if (uart_circ_empty(xmit)) + if (kfifo_is_empty(&tport->xmit_fifo)) mlb_usio_stop_tx(port); } diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c index d27c4c8c84..0a9c5219df 100644 --- a/drivers/tty/serial/msm_serial.c +++ b/drivers/tty/serial/msm_serial.c @@ -161,11 +161,16 @@ enum { struct msm_dma { struct dma_chan *chan; enum dma_data_direction dir; - dma_addr_t phys; - unsigned char *virt; + union { + struct { + dma_addr_t phys; + unsigned char *virt; + unsigned int count; + } rx; + struct scatterlist tx_sg; + }; dma_cookie_t cookie; u32 enable_bit; - unsigned int count; struct dma_async_tx_descriptor *desc; }; @@ -249,8 +254,12 @@ static void msm_stop_dma(struct uart_port *port, struct msm_dma *dma) unsigned int mapped; u32 val; - mapped = dma->count; - dma->count = 0; + if (dma->dir == DMA_TO_DEVICE) { + mapped = sg_dma_len(&dma->tx_sg); + } else { + mapped = dma->rx.count; + dma->rx.count = 0; + } dmaengine_terminate_all(dma->chan); @@ -265,8 +274,13 @@ static void msm_stop_dma(struct uart_port *port, struct msm_dma *dma) val &= ~dma->enable_bit; msm_write(port, val, UARTDM_DMEN); - if (mapped) - dma_unmap_single(dev, dma->phys, mapped, dma->dir); + if (mapped) { + if (dma->dir == DMA_TO_DEVICE) { + dma_unmap_sg(dev, &dma->tx_sg, 1, dma->dir); + sg_init_table(&dma->tx_sg, 1); + } else + dma_unmap_single(dev, dma->rx.phys, mapped, dma->dir); + } } static void msm_release_dma(struct msm_port *msm_port) @@ -285,7 +299,7 @@ static void msm_release_dma(struct msm_port *msm_port) if (dma->chan) { msm_stop_dma(&msm_port->uart, dma); dma_release_channel(dma->chan); - kfree(dma->virt); + kfree(dma->rx.virt); } memset(dma, 0, sizeof(*dma)); @@ -357,8 +371,8 @@ static void msm_request_rx_dma(struct msm_port *msm_port, resource_size_t base) of_property_read_u32(dev->of_node, "qcom,rx-crci", &crci); - dma->virt = kzalloc(UARTDM_RX_SIZE, GFP_KERNEL); - if (!dma->virt) + dma->rx.virt = kzalloc(UARTDM_RX_SIZE, GFP_KERNEL); + if (!dma->rx.virt) goto rel_rx; memset(&conf, 0, sizeof(conf)); @@ -385,7 +399,7 @@ static void msm_request_rx_dma(struct msm_port *msm_port, resource_size_t base) return; err: - kfree(dma->virt); + kfree(dma->rx.virt); rel_rx: dma_release_channel(dma->chan); no_rx: @@ -420,7 +434,7 @@ static void msm_start_tx(struct uart_port *port) struct msm_dma *dma = &msm_port->tx_dma; /* Already started in DMA mode */ - if (dma->count) + if (sg_dma_len(&dma->tx_sg)) return; msm_port->imr |= MSM_UART_IMR_TXLEV; @@ -438,7 +452,7 @@ static void msm_complete_tx_dma(void *args) { struct msm_port *msm_port = args; struct uart_port *port = &msm_port->uart; - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; struct msm_dma *dma = &msm_port->tx_dma; struct dma_tx_state state; unsigned long flags; @@ -448,12 +462,12 @@ static void msm_complete_tx_dma(void *args) uart_port_lock_irqsave(port, &flags); /* Already stopped */ - if (!dma->count) + if (!sg_dma_len(&dma->tx_sg)) goto done; dmaengine_tx_status(dma->chan, dma->cookie, &state); - dma_unmap_single(port->dev, dma->phys, dma->count, dma->dir); + dma_unmap_sg(port->dev, &dma->tx_sg, 1, dma->dir); val = msm_read(port, UARTDM_DMEN); val &= ~dma->enable_bit; @@ -464,15 +478,15 @@ static void msm_complete_tx_dma(void *args) msm_write(port, MSM_UART_CR_TX_ENABLE, MSM_UART_CR); } - count = dma->count - state.residue; + count = sg_dma_len(&dma->tx_sg) - state.residue; uart_xmit_advance(port, count); - dma->count = 0; + sg_init_table(&dma->tx_sg, 1); /* Restore "Tx FIFO below watermark" interrupt */ msm_port->imr |= MSM_UART_IMR_TXLEV; msm_write(port, msm_port->imr, MSM_UART_IMR); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); msm_handle_tx(port); @@ -482,22 +496,24 @@ done: static int msm_handle_tx_dma(struct msm_port *msm_port, unsigned int count) { - struct circ_buf *xmit = &msm_port->uart.state->xmit; struct uart_port *port = &msm_port->uart; + struct tty_port *tport = &port->state->port; struct msm_dma *dma = &msm_port->tx_dma; - void *cpu_addr; + unsigned int mapped; int ret; u32 val; - cpu_addr = &xmit->buf[xmit->tail]; + sg_init_table(&dma->tx_sg, 1); + kfifo_dma_out_prepare(&tport->xmit_fifo, &dma->tx_sg, 1, count); - dma->phys = dma_map_single(port->dev, cpu_addr, count, dma->dir); - ret = dma_mapping_error(port->dev, dma->phys); - if (ret) - return ret; + mapped = dma_map_sg(port->dev, &dma->tx_sg, 1, dma->dir); + if (!mapped) { + ret = -EIO; + goto zero_sg; + } - dma->desc = dmaengine_prep_slave_single(dma->chan, dma->phys, - count, DMA_MEM_TO_DEV, + dma->desc = dmaengine_prep_slave_sg(dma->chan, &dma->tx_sg, 1, + DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_PREP_FENCE); if (!dma->desc) { @@ -520,8 +536,6 @@ static int msm_handle_tx_dma(struct msm_port *msm_port, unsigned int count) msm_port->imr &= ~MSM_UART_IMR_TXLEV; msm_write(port, msm_port->imr, MSM_UART_IMR); - dma->count = count; - val = msm_read(port, UARTDM_DMEN); val |= dma->enable_bit; @@ -536,7 +550,9 @@ static int msm_handle_tx_dma(struct msm_port *msm_port, unsigned int count) dma_async_issue_pending(dma->chan); return 0; unmap: - dma_unmap_single(port->dev, dma->phys, count, dma->dir); + dma_unmap_sg(port->dev, &dma->tx_sg, 1, dma->dir); +zero_sg: + sg_init_table(&dma->tx_sg, 1); return ret; } @@ -553,7 +569,7 @@ static void msm_complete_rx_dma(void *args) uart_port_lock_irqsave(port, &flags); /* Already stopped */ - if (!dma->count) + if (!dma->rx.count) goto done; val = msm_read(port, UARTDM_DMEN); @@ -570,14 +586,14 @@ static void msm_complete_rx_dma(void *args) port->icount.rx += count; - dma->count = 0; + dma->rx.count = 0; - dma_unmap_single(port->dev, dma->phys, UARTDM_RX_SIZE, dma->dir); + dma_unmap_single(port->dev, dma->rx.phys, UARTDM_RX_SIZE, dma->dir); for (i = 0; i < count; i++) { char flag = TTY_NORMAL; - if (msm_port->break_detected && dma->virt[i] == 0) { + if (msm_port->break_detected && dma->rx.virt[i] == 0) { port->icount.brk++; flag = TTY_BREAK; msm_port->break_detected = false; @@ -588,9 +604,9 @@ static void msm_complete_rx_dma(void *args) if (!(port->read_status_mask & MSM_UART_SR_RX_BREAK)) flag = TTY_NORMAL; - sysrq = uart_prepare_sysrq_char(port, dma->virt[i]); + sysrq = uart_prepare_sysrq_char(port, dma->rx.virt[i]); if (!sysrq) - tty_insert_flip_char(tport, dma->virt[i], flag); + tty_insert_flip_char(tport, dma->rx.virt[i], flag); } msm_start_rx_dma(msm_port); @@ -614,13 +630,13 @@ static void msm_start_rx_dma(struct msm_port *msm_port) if (!dma->chan) return; - dma->phys = dma_map_single(uart->dev, dma->virt, + dma->rx.phys = dma_map_single(uart->dev, dma->rx.virt, UARTDM_RX_SIZE, dma->dir); - ret = dma_mapping_error(uart->dev, dma->phys); + ret = dma_mapping_error(uart->dev, dma->rx.phys); if (ret) goto sw_mode; - dma->desc = dmaengine_prep_slave_single(dma->chan, dma->phys, + dma->desc = dmaengine_prep_slave_single(dma->chan, dma->rx.phys, UARTDM_RX_SIZE, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT); if (!dma->desc) @@ -648,7 +664,7 @@ static void msm_start_rx_dma(struct msm_port *msm_port) msm_write(uart, msm_port->imr, MSM_UART_IMR); - dma->count = UARTDM_RX_SIZE; + dma->rx.count = UARTDM_RX_SIZE; dma_async_issue_pending(dma->chan); @@ -668,7 +684,7 @@ static void msm_start_rx_dma(struct msm_port *msm_port) return; unmap: - dma_unmap_single(uart->dev, dma->phys, UARTDM_RX_SIZE, dma->dir); + dma_unmap_single(uart->dev, dma->rx.phys, UARTDM_RX_SIZE, dma->dir); sw_mode: /* @@ -831,8 +847,8 @@ static void msm_handle_rx(struct uart_port *port) static void msm_handle_tx_pio(struct uart_port *port, unsigned int tx_count) { - struct circ_buf *xmit = &port->state->xmit; struct msm_port *msm_port = to_msm_port(port); + struct tty_port *tport = &port->state->port; unsigned int num_chars; unsigned int tf_pointer = 0; void __iomem *tf; @@ -846,8 +862,7 @@ static void msm_handle_tx_pio(struct uart_port *port, unsigned int tx_count) msm_reset_dm_count(port, tx_count); while (tf_pointer < tx_count) { - int i; - char buf[4] = { 0 }; + unsigned char buf[4] = { 0 }; if (!(msm_read(port, MSM_UART_SR) & MSM_UART_SR_TX_READY)) break; @@ -858,26 +873,23 @@ static void msm_handle_tx_pio(struct uart_port *port, unsigned int tx_count) else num_chars = 1; - for (i = 0; i < num_chars; i++) - buf[i] = xmit->buf[xmit->tail + i]; - + num_chars = uart_fifo_out(port, buf, num_chars); iowrite32_rep(tf, buf, 1); - uart_xmit_advance(port, num_chars); tf_pointer += num_chars; } /* disable tx interrupts if nothing more to send */ - if (uart_circ_empty(xmit)) + if (kfifo_is_empty(&tport->xmit_fifo)) msm_stop_tx(port); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); } static void msm_handle_tx(struct uart_port *port) { struct msm_port *msm_port = to_msm_port(port); - struct circ_buf *xmit = &msm_port->uart.state->xmit; + struct tty_port *tport = &port->state->port; struct msm_dma *dma = &msm_port->tx_dma; unsigned int pio_count, dma_count, dma_min; char buf[4] = { 0 }; @@ -901,13 +913,13 @@ static void msm_handle_tx(struct uart_port *port) return; } - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { + if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) { msm_stop_tx(port); return; } - pio_count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); - dma_count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); + dma_count = pio_count = kfifo_out_linear(&tport->xmit_fifo, NULL, + UART_XMIT_SIZE); dma_min = 1; /* Always DMA */ if (msm_port->is_uartdm > UARTDM_1P3) { @@ -955,7 +967,7 @@ static irqreturn_t msm_uart_irq(int irq, void *dev_id) } if (misr & (MSM_UART_IMR_RXLEV | MSM_UART_IMR_RXSTALE)) { - if (dma->count) { + if (dma->rx.count) { val = MSM_UART_CR_CMD_STALE_EVENT_DISABLE; msm_write(port, val, MSM_UART_CR); val = MSM_UART_CR_CMD_RESET_STALE_INT; diff --git a/drivers/tty/serial/mvebu-uart.c b/drivers/tty/serial/mvebu-uart.c index 0255646bc1..5de57b77ab 100644 --- a/drivers/tty/serial/mvebu-uart.c +++ b/drivers/tty/serial/mvebu-uart.c @@ -219,12 +219,10 @@ static void mvebu_uart_stop_tx(struct uart_port *port) static void mvebu_uart_start_tx(struct uart_port *port) { unsigned int ctl; - struct circ_buf *xmit = &port->state->xmit; + unsigned char c; - if (IS_EXTENDED(port) && !uart_circ_empty(xmit)) { - writel(xmit->buf[xmit->tail], port->membase + UART_TSH(port)); - uart_xmit_advance(port, 1); - } + if (IS_EXTENDED(port) && uart_fifo_get(port, &c)) + writel(c, port->membase + UART_TSH(port)); ctl = readl(port->membase + UART_INTR(port)); ctl |= CTRL_TX_RDY_INT(port); diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c index 1e8853eae5..a1c76565c3 100644 --- a/drivers/tty/serial/mxs-auart.c +++ b/drivers/tty/serial/mxs-auart.c @@ -517,7 +517,7 @@ static void mxs_auart_tx_chars(struct mxs_auart_port *s); static void dma_tx_callback(void *param) { struct mxs_auart_port *s = param; - struct circ_buf *xmit = &s->port.state->xmit; + struct tty_port *tport = &s->port.state->port; dma_unmap_sg(s->dev, &s->tx_sgl, 1, DMA_TO_DEVICE); @@ -526,7 +526,7 @@ static void dma_tx_callback(void *param) smp_mb__after_atomic(); /* wake up the possible processes. */ - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(&s->port); mxs_auart_tx_chars(s); @@ -568,33 +568,22 @@ static int mxs_auart_dma_tx(struct mxs_auart_port *s, int size) static void mxs_auart_tx_chars(struct mxs_auart_port *s) { - struct circ_buf *xmit = &s->port.state->xmit; + struct tty_port *tport = &s->port.state->port; bool pending; u8 ch; if (auart_dma_enabled(s)) { u32 i = 0; - int size; void *buffer = s->tx_dma_buf; if (test_and_set_bit(MXS_AUART_DMA_TX_SYNC, &s->flags)) return; - while (!uart_circ_empty(xmit) && !uart_tx_stopped(&s->port)) { - size = min_t(u32, UART_XMIT_SIZE - i, - CIRC_CNT_TO_END(xmit->head, - xmit->tail, - UART_XMIT_SIZE)); - memcpy(buffer + i, xmit->buf + xmit->tail, size); - xmit->tail = (xmit->tail + size) & (UART_XMIT_SIZE - 1); - - i += size; - if (i >= UART_XMIT_SIZE) - break; - } - if (uart_tx_stopped(&s->port)) mxs_auart_stop_tx(&s->port); + else + i = kfifo_out(&tport->xmit_fifo, buffer, + UART_XMIT_SIZE); if (i) { mxs_auart_dma_tx(s, i); diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c index 9be1c871cf..d7e172eeaa 100644 --- a/drivers/tty/serial/omap-serial.c +++ b/drivers/tty/serial/omap-serial.c @@ -1093,7 +1093,6 @@ static void __maybe_unused wait_for_xmitr(struct uart_omap_port *up) /* Wait up to 1s for flow control if necessary */ if (up->port.flags & UPF_CONS_FLOW) { - tmout = 1000000; for (tmout = 1000000; tmout; tmout--) { unsigned int msr = serial_in(up, UART_MSR); diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c index 89257cddf5..c7cee5fee6 100644 --- a/drivers/tty/serial/pch_uart.c +++ b/drivers/tty/serial/pch_uart.c @@ -808,7 +808,7 @@ static int dma_handle_rx(struct eg20t_port *priv) static unsigned int handle_tx(struct eg20t_port *priv) { struct uart_port *port = &priv->port; - struct circ_buf *xmit = &port->state->xmit; + unsigned char ch; int fifo_size; int tx_empty; @@ -830,9 +830,9 @@ static unsigned int handle_tx(struct eg20t_port *priv) fifo_size--; } - while (!uart_tx_stopped(port) && !uart_circ_empty(xmit) && fifo_size) { - iowrite8(xmit->buf[xmit->tail], priv->membase + PCH_UART_THR); - uart_xmit_advance(port, 1); + while (!uart_tx_stopped(port) && fifo_size && + uart_fifo_get(port, &ch)) { + iowrite8(ch, priv->membase + PCH_UART_THR); fifo_size--; tx_empty = 0; } @@ -850,14 +850,14 @@ static unsigned int handle_tx(struct eg20t_port *priv) static unsigned int dma_handle_tx(struct eg20t_port *priv) { struct uart_port *port = &priv->port; - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; struct scatterlist *sg; int nent; int fifo_size; struct dma_async_tx_descriptor *desc; + unsigned int bytes, tail; int num; int i; - int bytes; int size; int rem; @@ -886,7 +886,7 @@ static unsigned int dma_handle_tx(struct eg20t_port *priv) fifo_size--; } - bytes = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); + bytes = kfifo_out_linear(&tport->xmit_fifo, &tail, UART_XMIT_SIZE); if (!bytes) { dev_dbg(priv->port.dev, "%s 0 bytes return\n", __func__); pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT); @@ -920,10 +920,10 @@ static unsigned int dma_handle_tx(struct eg20t_port *priv) for (i = 0; i < num; i++, sg++) { if (i == (num - 1)) - sg_set_page(sg, virt_to_page(xmit->buf), + sg_set_page(sg, virt_to_page(tport->xmit_buf), rem, fifo_size * i); else - sg_set_page(sg, virt_to_page(xmit->buf), + sg_set_page(sg, virt_to_page(tport->xmit_buf), size, fifo_size * i); } @@ -937,8 +937,7 @@ static unsigned int dma_handle_tx(struct eg20t_port *priv) priv->nent = nent; for (i = 0; i < nent; i++, sg++) { - sg->offset = (xmit->tail & (UART_XMIT_SIZE - 1)) + - fifo_size * i; + sg->offset = tail + fifo_size * i; sg_dma_address(sg) = (sg_dma_address(sg) & ~(UART_XMIT_SIZE - 1)) + sg->offset; if (i == (nent - 1)) diff --git a/drivers/tty/serial/pic32_uart.c b/drivers/tty/serial/pic32_uart.c index bbb46e6e98..261c8115a7 100644 --- a/drivers/tty/serial/pic32_uart.c +++ b/drivers/tty/serial/pic32_uart.c @@ -8,11 +8,11 @@ * Sorin-Andrei Pistirica <andrei.pistirica@microchip.com> */ +#include <linux/gpio/consumer.h> #include <linux/kernel.h> #include <linux/platform_device.h> #include <linux/of.h> #include <linux/of_irq.h> -#include <linux/of_gpio.h> #include <linux/init.h> #include <linux/module.h> #include <linux/slab.h> @@ -342,7 +342,7 @@ static void pic32_uart_do_rx(struct uart_port *port) static void pic32_uart_do_tx(struct uart_port *port) { struct pic32_sport *sport = to_pic32_sport(port); - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; unsigned int max_count = PIC32_UART_TX_FIFO_DEPTH; if (port->x_char) { @@ -357,7 +357,7 @@ static void pic32_uart_do_tx(struct uart_port *port) return; } - if (uart_circ_empty(xmit)) + if (kfifo_is_empty(&tport->xmit_fifo)) goto txq_empty; /* keep stuffing chars into uart tx buffer @@ -371,21 +371,20 @@ static void pic32_uart_do_tx(struct uart_port *port) */ while (!(PIC32_UART_STA_UTXBF & pic32_uart_readl(sport, PIC32_UART_STA))) { - unsigned int c = xmit->buf[xmit->tail]; + unsigned char c; + if (!uart_fifo_get(port, &c)) + break; pic32_uart_writel(sport, PIC32_UART_TX, c); - uart_xmit_advance(port, 1); - if (uart_circ_empty(xmit)) - break; if (--max_count == 0) break; } - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); - if (uart_circ_empty(xmit)) + if (kfifo_is_empty(&tport->xmit_fifo)) goto txq_empty; return; diff --git a/drivers/tty/serial/pmac_zilog.c b/drivers/tty/serial/pmac_zilog.c index 92195f984d..8969b11cc0 100644 --- a/drivers/tty/serial/pmac_zilog.c +++ b/drivers/tty/serial/pmac_zilog.c @@ -333,7 +333,8 @@ static void pmz_status_handle(struct uart_pmac_port *uap) static void pmz_transmit_chars(struct uart_pmac_port *uap) { - struct circ_buf *xmit; + struct tty_port *tport; + unsigned char ch; if (ZS_IS_CONS(uap)) { unsigned char status = read_zsreg(uap, R0); @@ -384,8 +385,8 @@ static void pmz_transmit_chars(struct uart_pmac_port *uap) if (uap->port.state == NULL) goto ack_tx_int; - xmit = &uap->port.state->xmit; - if (uart_circ_empty(xmit)) { + tport = &uap->port.state->port; + if (kfifo_is_empty(&tport->xmit_fifo)) { uart_write_wakeup(&uap->port); goto ack_tx_int; } @@ -393,12 +394,11 @@ static void pmz_transmit_chars(struct uart_pmac_port *uap) goto ack_tx_int; uap->flags |= PMACZILOG_FLAG_TX_ACTIVE; - write_zsdata(uap, xmit->buf[xmit->tail]); + WARN_ON(!uart_fifo_get(&uap->port, &ch)); + write_zsdata(uap, ch); zssync(uap); - uart_xmit_advance(&uap->port, 1); - - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(&uap->port); return; @@ -606,15 +606,15 @@ static void pmz_start_tx(struct uart_port *port) port->icount.tx++; port->x_char = 0; } else { - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; + unsigned char ch; - if (uart_circ_empty(xmit)) + if (!uart_fifo_get(&uap->port, &ch)) return; - write_zsdata(uap, xmit->buf[xmit->tail]); + write_zsdata(uap, ch); zssync(uap); - uart_xmit_advance(port, 1); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(&uap->port); } } @@ -1681,7 +1681,7 @@ static void pmz_dispose_port(struct uart_pmac_port *uap) memset(uap, 0, sizeof(struct uart_pmac_port)); } -static int __init pmz_attach(struct platform_device *pdev) +static int pmz_attach(struct platform_device *pdev) { struct uart_pmac_port *uap; int i; @@ -1700,7 +1700,7 @@ static int __init pmz_attach(struct platform_device *pdev) return uart_add_one_port(&pmz_uart_reg, &uap->port); } -static void __exit pmz_detach(struct platform_device *pdev) +static void pmz_detach(struct platform_device *pdev) { struct uart_pmac_port *uap = platform_get_drvdata(pdev); @@ -1775,7 +1775,8 @@ static struct macio_driver pmz_driver = { #else static struct platform_driver pmz_driver = { - .remove_new = __exit_p(pmz_detach), + .probe = pmz_attach, + .remove_new = pmz_detach, .driver = { .name = "scc", }, @@ -1823,7 +1824,7 @@ static int __init init_pmz(void) #ifdef CONFIG_PPC_PMAC return macio_register_driver(&pmz_driver); #else - return platform_driver_probe(&pmz_driver, pmz_attach); + return platform_driver_register(&pmz_driver); #endif } diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c index f9f7ac1a10..69a632fefc 100644 --- a/drivers/tty/serial/qcom_geni_serial.c +++ b/drivers/tty/serial/qcom_geni_serial.c @@ -505,7 +505,7 @@ static void qcom_geni_serial_console_write(struct console *co, const char *s, */ qcom_geni_serial_poll_tx_done(uport); - if (!uart_circ_empty(&uport->state->xmit)) { + if (!kfifo_is_empty(&uport->state->port.xmit_fifo)) { irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN); writel(irq_en | M_TX_FIFO_WATERMARK_EN, uport->membase + SE_GENI_M_IRQ_EN); @@ -620,22 +620,24 @@ static void qcom_geni_serial_stop_tx_dma(struct uart_port *uport) static void qcom_geni_serial_start_tx_dma(struct uart_port *uport) { struct qcom_geni_serial_port *port = to_dev_port(uport); - struct circ_buf *xmit = &uport->state->xmit; + struct tty_port *tport = &uport->state->port; unsigned int xmit_size; + u8 *tail; int ret; if (port->tx_dma_addr) return; - if (uart_circ_empty(xmit)) + if (kfifo_is_empty(&tport->xmit_fifo)) return; - xmit_size = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); + xmit_size = kfifo_out_linear_ptr(&tport->xmit_fifo, &tail, + UART_XMIT_SIZE); qcom_geni_serial_setup_tx(uport, xmit_size); - ret = geni_se_tx_dma_prep(&port->se, &xmit->buf[xmit->tail], - xmit_size, &port->tx_dma_addr); + ret = geni_se_tx_dma_prep(&port->se, tail, xmit_size, + &port->tx_dma_addr); if (ret) { dev_err(uport->dev, "unable to start TX SE DMA: %d\n", ret); qcom_geni_serial_stop_tx_dma(uport); @@ -647,15 +649,25 @@ static void qcom_geni_serial_start_tx_dma(struct uart_port *uport) static void qcom_geni_serial_start_tx_fifo(struct uart_port *uport) { + unsigned char c; u32 irq_en; - if (qcom_geni_serial_main_active(uport) || - !qcom_geni_serial_tx_empty(uport)) - return; + /* + * Start a new transfer in case the previous command was cancelled and + * left data in the FIFO which may prevent the watermark interrupt + * from triggering. Note that the stale data is discarded. + */ + if (!qcom_geni_serial_main_active(uport) && + !qcom_geni_serial_tx_empty(uport)) { + if (uart_fifo_out(uport, &c, 1) == 1) { + writel(M_CMD_DONE_EN, uport->membase + SE_GENI_M_IRQ_CLEAR); + qcom_geni_serial_setup_tx(uport, 1); + writel(c, uport->membase + SE_GENI_TX_FIFOn); + } + } irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN); irq_en |= M_TX_FIFO_WATERMARK_EN | M_CMD_DONE_EN; - writel(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG); writel(irq_en, uport->membase + SE_GENI_M_IRQ_EN); } @@ -663,13 +675,17 @@ static void qcom_geni_serial_start_tx_fifo(struct uart_port *uport) static void qcom_geni_serial_stop_tx_fifo(struct uart_port *uport) { u32 irq_en; - struct qcom_geni_serial_port *port = to_dev_port(uport); irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN); irq_en &= ~(M_CMD_DONE_EN | M_TX_FIFO_WATERMARK_EN); writel(0, uport->membase + SE_GENI_TX_WATERMARK_REG); writel(irq_en, uport->membase + SE_GENI_M_IRQ_EN); - /* Possible stop tx is called multiple times. */ +} + +static void qcom_geni_serial_cancel_tx_cmd(struct uart_port *uport) +{ + struct qcom_geni_serial_port *port = to_dev_port(uport); + if (!qcom_geni_serial_main_active(uport)) return; @@ -682,6 +698,8 @@ static void qcom_geni_serial_stop_tx_fifo(struct uart_port *uport) writel(M_CMD_ABORT_EN, uport->membase + SE_GENI_M_IRQ_CLEAR); } writel(M_CMD_CANCEL_EN, uport->membase + SE_GENI_M_IRQ_CLEAR); + + port->tx_remaining = 0; } static void qcom_geni_serial_handle_rx_fifo(struct uart_port *uport, bool drop) @@ -853,18 +871,14 @@ static void qcom_geni_serial_send_chunk_fifo(struct uart_port *uport, unsigned int chunk) { struct qcom_geni_serial_port *port = to_dev_port(uport); - struct circ_buf *xmit = &uport->state->xmit; - unsigned int tx_bytes, c, remaining = chunk; + unsigned int tx_bytes, remaining = chunk; u8 buf[BYTES_PER_FIFO_WORD]; while (remaining) { memset(buf, 0, sizeof(buf)); tx_bytes = min(remaining, BYTES_PER_FIFO_WORD); - for (c = 0; c < tx_bytes ; c++) { - buf[c] = xmit->buf[xmit->tail]; - uart_xmit_advance(uport, 1); - } + uart_fifo_out(uport, buf, tx_bytes); iowrite32_rep(uport->membase + SE_GENI_TX_FIFOn, buf, 1); @@ -877,7 +891,7 @@ static void qcom_geni_serial_handle_tx_fifo(struct uart_port *uport, bool done, bool active) { struct qcom_geni_serial_port *port = to_dev_port(uport); - struct circ_buf *xmit = &uport->state->xmit; + struct tty_port *tport = &uport->state->port; size_t avail; size_t pending; u32 status; @@ -890,15 +904,19 @@ static void qcom_geni_serial_handle_tx_fifo(struct uart_port *uport, if (active) pending = port->tx_remaining; else - pending = uart_circ_chars_pending(xmit); + pending = kfifo_len(&tport->xmit_fifo); - /* All data has been transmitted and acknowledged as received */ - if (!pending && !status && done) { + /* All data has been transmitted or command has been cancelled */ + if (!pending && done) { qcom_geni_serial_stop_tx_fifo(uport); goto out_write_wakeup; } - avail = port->tx_fifo_depth - (status & TX_FIFO_WC); + if (active) + avail = port->tx_fifo_depth - (status & TX_FIFO_WC); + else + avail = port->tx_fifo_depth; + avail *= BYTES_PER_FIFO_WORD; chunk = min(avail, pending); @@ -933,24 +951,24 @@ out_write_wakeup: uport->membase + SE_GENI_M_IRQ_EN); } - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(uport); } static void qcom_geni_serial_handle_tx_dma(struct uart_port *uport) { struct qcom_geni_serial_port *port = to_dev_port(uport); - struct circ_buf *xmit = &uport->state->xmit; + struct tty_port *tport = &uport->state->port; uart_xmit_advance(uport, port->tx_remaining); geni_se_tx_dma_unprep(&port->se, port->tx_dma_addr, port->tx_remaining); port->tx_dma_addr = 0; port->tx_remaining = 0; - if (!uart_circ_empty(xmit)) + if (!kfifo_is_empty(&tport->xmit_fifo)) qcom_geni_serial_start_tx_dma(uport); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(uport); } @@ -1071,11 +1089,15 @@ static void qcom_geni_serial_shutdown(struct uart_port *uport) { disable_irq(uport->irq); - if (uart_console(uport)) - return; - qcom_geni_serial_stop_tx(uport); qcom_geni_serial_stop_rx(uport); + + qcom_geni_serial_cancel_tx_cmd(uport); +} + +static void qcom_geni_serial_flush_buffer(struct uart_port *uport) +{ + qcom_geni_serial_cancel_tx_cmd(uport); } static int qcom_geni_serial_port_setup(struct uart_port *uport) @@ -1534,6 +1556,7 @@ static const struct uart_ops qcom_geni_console_pops = { .request_port = qcom_geni_serial_request_port, .config_port = qcom_geni_serial_config_port, .shutdown = qcom_geni_serial_shutdown, + .flush_buffer = qcom_geni_serial_flush_buffer, .type = qcom_geni_serial_get_type, .set_mctrl = qcom_geni_serial_set_mctrl, .get_mctrl = qcom_geni_serial_get_mctrl, diff --git a/drivers/tty/serial/rda-uart.c b/drivers/tty/serial/rda-uart.c index 82def9b863..663e35e424 100644 --- a/drivers/tty/serial/rda-uart.c +++ b/drivers/tty/serial/rda-uart.c @@ -330,8 +330,8 @@ static void rda_uart_set_termios(struct uart_port *port, static void rda_uart_send_chars(struct uart_port *port) { - struct circ_buf *xmit = &port->state->xmit; - unsigned int ch; + struct tty_port *tport = &port->state->port; + unsigned char ch; u32 val; if (uart_tx_stopped(port)) @@ -347,19 +347,14 @@ static void rda_uart_send_chars(struct uart_port *port) port->x_char = 0; } - while (rda_uart_read(port, RDA_UART_STATUS) & RDA_UART_TX_FIFO_MASK) { - if (uart_circ_empty(xmit)) - break; - - ch = xmit->buf[xmit->tail]; + while ((rda_uart_read(port, RDA_UART_STATUS) & RDA_UART_TX_FIFO_MASK) && + uart_fifo_get(port, &ch)) rda_uart_write(port, ch, RDA_UART_RXTX_BUFFER); - uart_xmit_advance(port, 1); - } - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); - if (!uart_circ_empty(xmit)) { + if (!kfifo_is_empty(&tport->xmit_fifo)) { /* Re-enable Tx FIFO interrupt */ val = rda_uart_read(port, RDA_UART_IRQ_MASK); val |= RDA_UART_TX_DATA_NEEDED; diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c index a2d07e05c5..dc35eb77d2 100644 --- a/drivers/tty/serial/samsung_tty.c +++ b/drivers/tty/serial/samsung_tty.c @@ -329,7 +329,7 @@ static void s3c24xx_serial_tx_dma_complete(void *args) { struct s3c24xx_uart_port *ourport = args; struct uart_port *port = &ourport->port; - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; struct s3c24xx_uart_dma *dma = ourport->dma; struct dma_tx_state state; unsigned long flags; @@ -348,7 +348,7 @@ static void s3c24xx_serial_tx_dma_complete(void *args) uart_xmit_advance(port, count); ourport->tx_in_progress = 0; - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); s3c24xx_serial_start_next_tx(ourport); @@ -431,17 +431,15 @@ static void s3c24xx_serial_start_tx_pio(struct s3c24xx_uart_port *ourport) } static int s3c24xx_serial_start_tx_dma(struct s3c24xx_uart_port *ourport, - unsigned int count) + unsigned int count, unsigned int tail) { - struct uart_port *port = &ourport->port; - struct circ_buf *xmit = &port->state->xmit; struct s3c24xx_uart_dma *dma = ourport->dma; if (ourport->tx_mode != S3C24XX_TX_DMA) enable_tx_dma(ourport); dma->tx_size = count & ~(dma_get_cache_alignment() - 1); - dma->tx_transfer_addr = dma->tx_addr + xmit->tail; + dma->tx_transfer_addr = dma->tx_addr + tail; dma_sync_single_for_device(dma->tx_chan->device->dev, dma->tx_transfer_addr, dma->tx_size, @@ -468,11 +466,11 @@ static int s3c24xx_serial_start_tx_dma(struct s3c24xx_uart_port *ourport, static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport) { struct uart_port *port = &ourport->port; - struct circ_buf *xmit = &port->state->xmit; - unsigned long count; + struct tty_port *tport = &port->state->port; + unsigned int count, tail; /* Get data size up to the end of buffer */ - count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); + count = kfifo_out_linear(&tport->xmit_fifo, &tail, UART_XMIT_SIZE); if (!count) { s3c24xx_serial_stop_tx(port); @@ -481,16 +479,16 @@ static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport) if (!ourport->dma || !ourport->dma->tx_chan || count < ourport->min_dma_size || - xmit->tail & (dma_get_cache_alignment() - 1)) + tail & (dma_get_cache_alignment() - 1)) s3c24xx_serial_start_tx_pio(ourport); else - s3c24xx_serial_start_tx_dma(ourport, count); + s3c24xx_serial_start_tx_dma(ourport, count, tail); } static void s3c24xx_serial_start_tx(struct uart_port *port) { struct s3c24xx_uart_port *ourport = to_ourport(port); - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; if (!ourport->tx_enabled) { if (port->flags & UPF_CONS_FLOW) @@ -502,7 +500,8 @@ static void s3c24xx_serial_start_tx(struct uart_port *port) } if (ourport->dma && ourport->dma->tx_chan) { - if (!uart_circ_empty(xmit) && !ourport->tx_in_progress) + if (!kfifo_is_empty(&tport->xmit_fifo) && + !ourport->tx_in_progress) s3c24xx_serial_start_next_tx(ourport); } } @@ -868,18 +867,19 @@ static irqreturn_t s3c24xx_serial_rx_irq(int irq, void *dev_id) static void s3c24xx_serial_tx_chars(struct s3c24xx_uart_port *ourport) { struct uart_port *port = &ourport->port; - struct circ_buf *xmit = &port->state->xmit; - int count, dma_count = 0; + struct tty_port *tport = &port->state->port; + unsigned int count, dma_count = 0, tail; - count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); + count = kfifo_out_linear(&tport->xmit_fifo, &tail, UART_XMIT_SIZE); if (ourport->dma && ourport->dma->tx_chan && count >= ourport->min_dma_size) { int align = dma_get_cache_alignment() - - (xmit->tail & (dma_get_cache_alignment() - 1)); + (tail & (dma_get_cache_alignment() - 1)); if (count - align >= ourport->min_dma_size) { dma_count = count - align; count = align; + tail += align; } } @@ -894,7 +894,7 @@ static void s3c24xx_serial_tx_chars(struct s3c24xx_uart_port *ourport) * stopped, disable the uart and exit */ - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { + if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) { s3c24xx_serial_stop_tx(port); return; } @@ -906,24 +906,25 @@ static void s3c24xx_serial_tx_chars(struct s3c24xx_uart_port *ourport) dma_count = 0; } - while (!uart_circ_empty(xmit) && count > 0) { - if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull) + while (!(rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)) { + unsigned char ch; + + if (!uart_fifo_get(port, &ch)) break; - wr_reg(port, S3C2410_UTXH, xmit->buf[xmit->tail]); - uart_xmit_advance(port, 1); + wr_reg(port, S3C2410_UTXH, ch); count--; } if (!count && dma_count) { - s3c24xx_serial_start_tx_dma(ourport, dma_count); + s3c24xx_serial_start_tx_dma(ourport, dma_count, tail); return; } - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); - if (uart_circ_empty(xmit)) + if (kfifo_is_empty(&tport->xmit_fifo)) s3c24xx_serial_stop_tx(port); } @@ -1118,7 +1119,8 @@ static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p) /* TX buffer */ dma->tx_addr = dma_map_single(dma->tx_chan->device->dev, - p->port.state->xmit.buf, UART_XMIT_SIZE, + p->port.state->port.xmit_buf, + UART_XMIT_SIZE, DMA_TO_DEVICE); if (dma_mapping_error(dma->tx_chan->device->dev, dma->tx_addr)) { reason = "DMA mapping error for TX buffer"; diff --git a/drivers/tty/serial/sb1250-duart.c b/drivers/tty/serial/sb1250-duart.c index dbec29d9a6..b4e1b90e59 100644 --- a/drivers/tty/serial/sb1250-duart.c +++ b/drivers/tty/serial/sb1250-duart.c @@ -382,7 +382,8 @@ static void sbd_receive_chars(struct sbd_port *sport) static void sbd_transmit_chars(struct sbd_port *sport) { struct uart_port *uport = &sport->port; - struct circ_buf *xmit = &sport->port.state->xmit; + struct tty_port *tport = &sport->port.state->port; + unsigned char ch; unsigned int mask; int stop_tx; @@ -395,19 +396,19 @@ static void sbd_transmit_chars(struct sbd_port *sport) } /* If nothing to do or stopped or hardware stopped. */ - stop_tx = (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)); + stop_tx = uart_tx_stopped(&sport->port) || + !uart_fifo_get(&sport->port, &ch); /* Send char. */ if (!stop_tx) { - write_sbdchn(sport, R_DUART_TX_HOLD, xmit->buf[xmit->tail]); - uart_xmit_advance(&sport->port, 1); + write_sbdchn(sport, R_DUART_TX_HOLD, ch); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(&sport->port); } /* Are we are done? */ - if (stop_tx || uart_circ_empty(xmit)) { + if (stop_tx || kfifo_is_empty(&tport->xmit_fifo)) { /* Disable tx interrupts. */ mask = read_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2)); mask &= ~M_DUART_IMR_TX; diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c index ace2c4b333..bf0065d1c8 100644 --- a/drivers/tty/serial/sc16is7xx.c +++ b/drivers/tty/serial/sc16is7xx.c @@ -1,19 +1,22 @@ // SPDX-License-Identifier: GPL-2.0+ /* - * SC16IS7xx tty serial driver - Copyright (C) 2014 GridPoint - * Author: Jon Ringle <jringle@gridpoint.com> + * SC16IS7xx tty serial driver - common code * - * Based on max310x.c, by Alexander Shiyan <shc_work@mail.ru> + * Copyright (C) 2014 GridPoint + * Author: Jon Ringle <jringle@gridpoint.com> + * Based on max310x.c, by Alexander Shiyan <shc_work@mail.ru> */ -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#undef DEFAULT_SYMBOL_NAMESPACE +#define DEFAULT_SYMBOL_NAMESPACE SERIAL_NXP_SC16IS7XX -#include <linux/bitops.h> #include <linux/clk.h> #include <linux/delay.h> #include <linux/device.h> +#include <linux/export.h> #include <linux/gpio/driver.h> -#include <linux/i2c.h> +#include <linux/idr.h> +#include <linux/kthread.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/property.h> @@ -21,15 +24,15 @@ #include <linux/sched.h> #include <linux/serial_core.h> #include <linux/serial.h> +#include <linux/string.h> #include <linux/tty.h> #include <linux/tty_flip.h> -#include <linux/spi/spi.h> #include <linux/uaccess.h> #include <linux/units.h> -#define SC16IS7XX_NAME "sc16is7xx" +#include "sc16is7xx.h" + #define SC16IS7XX_MAX_DEVS 8 -#define SC16IS7XX_MAX_PORTS 2 /* Maximum number of UART ports per IC. */ /* SC16IS7XX register definitions */ #define SC16IS7XX_RHR_REG (0x00) /* RX FIFO */ @@ -302,16 +305,9 @@ /* Misc definitions */ -#define SC16IS7XX_SPI_READ_BIT BIT(7) #define SC16IS7XX_FIFO_SIZE (64) #define SC16IS7XX_GPIOS_PER_BANK 4 -struct sc16is7xx_devtype { - char name[10]; - int nr_gpio; - int nr_uart; -}; - #define SC16IS7XX_RECONF_MD (1 << 0) #define SC16IS7XX_RECONF_IER (1 << 1) #define SC16IS7XX_RECONF_RS485 (1 << 2) @@ -349,7 +345,7 @@ struct sc16is7xx_port { struct sc16is7xx_one p[]; }; -static DECLARE_BITMAP(sc16is7xx_lines, SC16IS7XX_MAX_DEVS); +static DEFINE_IDA(sc16is7xx_lines); static struct uart_driver sc16is7xx_uart = { .owner = THIS_MODULE, @@ -492,35 +488,40 @@ static void sc16is7xx_stop_rx(struct uart_port *port) sc16is7xx_ier_clear(port, SC16IS7XX_IER_RDI_BIT); } -static const struct sc16is7xx_devtype sc16is74x_devtype = { +const struct sc16is7xx_devtype sc16is74x_devtype = { .name = "SC16IS74X", .nr_gpio = 0, .nr_uart = 1, }; +EXPORT_SYMBOL_GPL(sc16is74x_devtype); -static const struct sc16is7xx_devtype sc16is750_devtype = { +const struct sc16is7xx_devtype sc16is750_devtype = { .name = "SC16IS750", .nr_gpio = 8, .nr_uart = 1, }; +EXPORT_SYMBOL_GPL(sc16is750_devtype); -static const struct sc16is7xx_devtype sc16is752_devtype = { +const struct sc16is7xx_devtype sc16is752_devtype = { .name = "SC16IS752", .nr_gpio = 8, .nr_uart = 2, }; +EXPORT_SYMBOL_GPL(sc16is752_devtype); -static const struct sc16is7xx_devtype sc16is760_devtype = { +const struct sc16is7xx_devtype sc16is760_devtype = { .name = "SC16IS760", .nr_gpio = 8, .nr_uart = 1, }; +EXPORT_SYMBOL_GPL(sc16is760_devtype); -static const struct sc16is7xx_devtype sc16is762_devtype = { +const struct sc16is7xx_devtype sc16is762_devtype = { .name = "SC16IS762", .nr_gpio = 8, .nr_uart = 2, }; +EXPORT_SYMBOL_GPL(sc16is762_devtype); static bool sc16is7xx_regmap_volatile(struct device *dev, unsigned int reg) { @@ -689,9 +690,9 @@ static void sc16is7xx_handle_rx(struct uart_port *port, unsigned int rxlen, static void sc16is7xx_handle_tx(struct uart_port *port) { struct sc16is7xx_port *s = dev_get_drvdata(port->dev); - struct circ_buf *xmit = &port->state->xmit; - unsigned int txlen, to_send, i; + struct tty_port *tport = &port->state->port; unsigned long flags; + unsigned int txlen; if (unlikely(port->x_char)) { sc16is7xx_port_write(port, SC16IS7XX_THR_REG, port->x_char); @@ -700,40 +701,30 @@ static void sc16is7xx_handle_tx(struct uart_port *port) return; } - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { + if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) { uart_port_lock_irqsave(port, &flags); sc16is7xx_stop_tx(port); uart_port_unlock_irqrestore(port, flags); return; } - /* Get length of data pending in circular buffer */ - to_send = uart_circ_chars_pending(xmit); - if (likely(to_send)) { - /* Limit to space available in TX FIFO */ - txlen = sc16is7xx_port_read(port, SC16IS7XX_TXLVL_REG); - if (txlen > SC16IS7XX_FIFO_SIZE) { - dev_err_ratelimited(port->dev, - "chip reports %d free bytes in TX fifo, but it only has %d", - txlen, SC16IS7XX_FIFO_SIZE); - txlen = 0; - } - to_send = (to_send > txlen) ? txlen : to_send; - - /* Convert to linear buffer */ - for (i = 0; i < to_send; ++i) { - s->buf[i] = xmit->buf[xmit->tail]; - uart_xmit_advance(port, 1); - } - - sc16is7xx_fifo_write(port, s->buf, to_send); + /* Limit to space available in TX FIFO */ + txlen = sc16is7xx_port_read(port, SC16IS7XX_TXLVL_REG); + if (txlen > SC16IS7XX_FIFO_SIZE) { + dev_err_ratelimited(port->dev, + "chip reports %d free bytes in TX fifo, but it only has %d", + txlen, SC16IS7XX_FIFO_SIZE); + txlen = 0; } + txlen = uart_fifo_out(port, s->buf, txlen); + sc16is7xx_fifo_write(port, s->buf, txlen); + uart_port_lock_irqsave(port, &flags); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); - if (uart_circ_empty(xmit)) + if (kfifo_is_empty(&tport->xmit_fifo)) sc16is7xx_stop_tx(port); else sc16is7xx_ier_set(port, SC16IS7XX_IER_THRI_BIT); @@ -1476,15 +1467,15 @@ static const struct serial_rs485 sc16is7xx_rs485_supported = { .delay_rts_after_send = 1, /* Not supported but keep returning -EINVAL */ }; -static int sc16is7xx_probe(struct device *dev, - const struct sc16is7xx_devtype *devtype, - struct regmap *regmaps[], int irq) +int sc16is7xx_probe(struct device *dev, const struct sc16is7xx_devtype *devtype, + struct regmap *regmaps[], int irq) { unsigned long freq = 0, *pfreq = dev_get_platdata(dev); unsigned int val; u32 uartclk = 0; int i, ret; struct sc16is7xx_port *s; + bool port_registered[SC16IS7XX_MAX_PORTS]; for (i = 0; i < devtype->nr_uart; i++) if (IS_ERR(regmaps[i])) @@ -1549,13 +1540,19 @@ static int sc16is7xx_probe(struct device *dev, regmap_write(regmaps[0], SC16IS7XX_IOCONTROL_REG, SC16IS7XX_IOCONTROL_SRESET_BIT); + /* Mark each port line and status as uninitialised. */ for (i = 0; i < devtype->nr_uart; ++i) { - s->p[i].port.line = find_first_zero_bit(sc16is7xx_lines, - SC16IS7XX_MAX_DEVS); - if (s->p[i].port.line >= SC16IS7XX_MAX_DEVS) { - ret = -ERANGE; + s->p[i].port.line = SC16IS7XX_MAX_DEVS; + port_registered[i] = false; + } + + for (i = 0; i < devtype->nr_uart; ++i) { + ret = ida_alloc_max(&sc16is7xx_lines, + SC16IS7XX_MAX_DEVS - 1, GFP_KERNEL); + if (ret < 0) goto out_ports; - } + + s->p[i].port.line = ret; /* Initialize port data */ s->p[i].port.dev = dev; @@ -1601,7 +1598,7 @@ static int sc16is7xx_probe(struct device *dev, if (ret) goto out_ports; - set_bit(s->p[i].port.line, sc16is7xx_lines); + port_registered[i] = true; /* Enable EFR */ sc16is7xx_port_write(&s->p[i].port, SC16IS7XX_LCR_REG, @@ -1659,9 +1656,12 @@ static int sc16is7xx_probe(struct device *dev, #endif out_ports: - for (i = 0; i < devtype->nr_uart; i++) - if (test_and_clear_bit(s->p[i].port.line, sc16is7xx_lines)) + for (i = 0; i < devtype->nr_uart; i++) { + if (s->p[i].port.line < SC16IS7XX_MAX_DEVS) + ida_free(&sc16is7xx_lines, s->p[i].port.line); + if (port_registered[i]) uart_remove_one_port(&sc16is7xx_uart, &s->p[i].port); + } kthread_stop(s->kworker_task); @@ -1670,8 +1670,9 @@ out_clk: return ret; } +EXPORT_SYMBOL_GPL(sc16is7xx_probe); -static void sc16is7xx_remove(struct device *dev) +void sc16is7xx_remove(struct device *dev) { struct sc16is7xx_port *s = dev_get_drvdata(dev); int i; @@ -1683,8 +1684,8 @@ static void sc16is7xx_remove(struct device *dev) for (i = 0; i < s->devtype->nr_uart; i++) { kthread_cancel_delayed_work_sync(&s->p[i].ms_work); - if (test_and_clear_bit(s->p[i].port.line, sc16is7xx_lines)) - uart_remove_one_port(&sc16is7xx_uart, &s->p[i].port); + ida_free(&sc16is7xx_lines, s->p[i].port.line); + uart_remove_one_port(&sc16is7xx_uart, &s->p[i].port); sc16is7xx_power(&s->p[i].port, 0); } @@ -1693,8 +1694,9 @@ static void sc16is7xx_remove(struct device *dev) clk_disable_unprepare(s->clk); } +EXPORT_SYMBOL_GPL(sc16is7xx_remove); -static const struct of_device_id __maybe_unused sc16is7xx_dt_ids[] = { +const struct of_device_id __maybe_unused sc16is7xx_dt_ids[] = { { .compatible = "nxp,sc16is740", .data = &sc16is74x_devtype, }, { .compatible = "nxp,sc16is741", .data = &sc16is74x_devtype, }, { .compatible = "nxp,sc16is750", .data = &sc16is750_devtype, }, @@ -1703,13 +1705,14 @@ static const struct of_device_id __maybe_unused sc16is7xx_dt_ids[] = { { .compatible = "nxp,sc16is762", .data = &sc16is762_devtype, }, { } }; +EXPORT_SYMBOL_GPL(sc16is7xx_dt_ids); MODULE_DEVICE_TABLE(of, sc16is7xx_dt_ids); -static struct regmap_config regcfg = { +const struct regmap_config sc16is7xx_regcfg = { .reg_bits = 5, .pad_bits = 3, .val_bits = 8, - .cache_type = REGCACHE_RBTREE, + .cache_type = REGCACHE_MAPLE, .volatile_reg = sc16is7xx_regmap_volatile, .precious_reg = sc16is7xx_regmap_precious, .writeable_noinc_reg = sc16is7xx_regmap_noinc, @@ -1718,8 +1721,9 @@ static struct regmap_config regcfg = { .max_raw_write = SC16IS7XX_FIFO_SIZE, .max_register = SC16IS7XX_EFCR_REG, }; +EXPORT_SYMBOL_GPL(sc16is7xx_regcfg); -static const char *sc16is7xx_regmap_name(u8 port_id) +const char *sc16is7xx_regmap_name(u8 port_id) { switch (port_id) { case 0: return "port0"; @@ -1729,184 +1733,27 @@ static const char *sc16is7xx_regmap_name(u8 port_id) return NULL; } } +EXPORT_SYMBOL_GPL(sc16is7xx_regmap_name); -static unsigned int sc16is7xx_regmap_port_mask(unsigned int port_id) +unsigned int sc16is7xx_regmap_port_mask(unsigned int port_id) { /* CH1,CH0 are at bits 2:1. */ return port_id << 1; } - -#ifdef CONFIG_SERIAL_SC16IS7XX_SPI -static int sc16is7xx_spi_probe(struct spi_device *spi) -{ - const struct sc16is7xx_devtype *devtype; - struct regmap *regmaps[SC16IS7XX_MAX_PORTS]; - unsigned int i; - int ret; - - /* Setup SPI bus */ - spi->bits_per_word = 8; - /* For all variants, only mode 0 is supported */ - if ((spi->mode & SPI_MODE_X_MASK) != SPI_MODE_0) - return dev_err_probe(&spi->dev, -EINVAL, "Unsupported SPI mode\n"); - - spi->mode = spi->mode ? : SPI_MODE_0; - spi->max_speed_hz = spi->max_speed_hz ? : 4 * HZ_PER_MHZ; - ret = spi_setup(spi); - if (ret) - return ret; - - devtype = spi_get_device_match_data(spi); - if (!devtype) - return dev_err_probe(&spi->dev, -ENODEV, "Failed to match device\n"); - - for (i = 0; i < devtype->nr_uart; i++) { - regcfg.name = sc16is7xx_regmap_name(i); - /* - * If read_flag_mask is 0, the regmap code sets it to a default - * of 0x80. Since we specify our own mask, we must add the READ - * bit ourselves: - */ - regcfg.read_flag_mask = sc16is7xx_regmap_port_mask(i) | - SC16IS7XX_SPI_READ_BIT; - regcfg.write_flag_mask = sc16is7xx_regmap_port_mask(i); - regmaps[i] = devm_regmap_init_spi(spi, ®cfg); - } - - return sc16is7xx_probe(&spi->dev, devtype, regmaps, spi->irq); -} - -static void sc16is7xx_spi_remove(struct spi_device *spi) -{ - sc16is7xx_remove(&spi->dev); -} - -static const struct spi_device_id sc16is7xx_spi_id_table[] = { - { "sc16is74x", (kernel_ulong_t)&sc16is74x_devtype, }, - { "sc16is740", (kernel_ulong_t)&sc16is74x_devtype, }, - { "sc16is741", (kernel_ulong_t)&sc16is74x_devtype, }, - { "sc16is750", (kernel_ulong_t)&sc16is750_devtype, }, - { "sc16is752", (kernel_ulong_t)&sc16is752_devtype, }, - { "sc16is760", (kernel_ulong_t)&sc16is760_devtype, }, - { "sc16is762", (kernel_ulong_t)&sc16is762_devtype, }, - { } -}; - -MODULE_DEVICE_TABLE(spi, sc16is7xx_spi_id_table); - -static struct spi_driver sc16is7xx_spi_uart_driver = { - .driver = { - .name = SC16IS7XX_NAME, - .of_match_table = sc16is7xx_dt_ids, - }, - .probe = sc16is7xx_spi_probe, - .remove = sc16is7xx_spi_remove, - .id_table = sc16is7xx_spi_id_table, -}; -#endif - -#ifdef CONFIG_SERIAL_SC16IS7XX_I2C -static int sc16is7xx_i2c_probe(struct i2c_client *i2c) -{ - const struct sc16is7xx_devtype *devtype; - struct regmap *regmaps[SC16IS7XX_MAX_PORTS]; - unsigned int i; - - devtype = i2c_get_match_data(i2c); - if (!devtype) - return dev_err_probe(&i2c->dev, -ENODEV, "Failed to match device\n"); - - for (i = 0; i < devtype->nr_uart; i++) { - regcfg.name = sc16is7xx_regmap_name(i); - regcfg.read_flag_mask = sc16is7xx_regmap_port_mask(i); - regcfg.write_flag_mask = sc16is7xx_regmap_port_mask(i); - regmaps[i] = devm_regmap_init_i2c(i2c, ®cfg); - } - - return sc16is7xx_probe(&i2c->dev, devtype, regmaps, i2c->irq); -} - -static void sc16is7xx_i2c_remove(struct i2c_client *client) -{ - sc16is7xx_remove(&client->dev); -} - -static const struct i2c_device_id sc16is7xx_i2c_id_table[] = { - { "sc16is74x", (kernel_ulong_t)&sc16is74x_devtype, }, - { "sc16is740", (kernel_ulong_t)&sc16is74x_devtype, }, - { "sc16is741", (kernel_ulong_t)&sc16is74x_devtype, }, - { "sc16is750", (kernel_ulong_t)&sc16is750_devtype, }, - { "sc16is752", (kernel_ulong_t)&sc16is752_devtype, }, - { "sc16is760", (kernel_ulong_t)&sc16is760_devtype, }, - { "sc16is762", (kernel_ulong_t)&sc16is762_devtype, }, - { } -}; -MODULE_DEVICE_TABLE(i2c, sc16is7xx_i2c_id_table); - -static struct i2c_driver sc16is7xx_i2c_uart_driver = { - .driver = { - .name = SC16IS7XX_NAME, - .of_match_table = sc16is7xx_dt_ids, - }, - .probe = sc16is7xx_i2c_probe, - .remove = sc16is7xx_i2c_remove, - .id_table = sc16is7xx_i2c_id_table, -}; - -#endif +EXPORT_SYMBOL_GPL(sc16is7xx_regmap_port_mask); static int __init sc16is7xx_init(void) { - int ret; - - ret = uart_register_driver(&sc16is7xx_uart); - if (ret) { - pr_err("Registering UART driver failed\n"); - return ret; - } - -#ifdef CONFIG_SERIAL_SC16IS7XX_I2C - ret = i2c_add_driver(&sc16is7xx_i2c_uart_driver); - if (ret < 0) { - pr_err("failed to init sc16is7xx i2c --> %d\n", ret); - goto err_i2c; - } -#endif - -#ifdef CONFIG_SERIAL_SC16IS7XX_SPI - ret = spi_register_driver(&sc16is7xx_spi_uart_driver); - if (ret < 0) { - pr_err("failed to init sc16is7xx spi --> %d\n", ret); - goto err_spi; - } -#endif - return ret; - -#ifdef CONFIG_SERIAL_SC16IS7XX_SPI -err_spi: -#endif -#ifdef CONFIG_SERIAL_SC16IS7XX_I2C - i2c_del_driver(&sc16is7xx_i2c_uart_driver); -err_i2c: -#endif - uart_unregister_driver(&sc16is7xx_uart); - return ret; + return uart_register_driver(&sc16is7xx_uart); } module_init(sc16is7xx_init); static void __exit sc16is7xx_exit(void) { -#ifdef CONFIG_SERIAL_SC16IS7XX_I2C - i2c_del_driver(&sc16is7xx_i2c_uart_driver); -#endif - -#ifdef CONFIG_SERIAL_SC16IS7XX_SPI - spi_unregister_driver(&sc16is7xx_spi_uart_driver); -#endif uart_unregister_driver(&sc16is7xx_uart); } module_exit(sc16is7xx_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Jon Ringle <jringle@gridpoint.com>"); -MODULE_DESCRIPTION("SC16IS7XX serial driver"); +MODULE_DESCRIPTION("SC16IS7xx tty serial core driver"); diff --git a/drivers/tty/serial/sc16is7xx.h b/drivers/tty/serial/sc16is7xx.h new file mode 100644 index 0000000000..afb784eaee --- /dev/null +++ b/drivers/tty/serial/sc16is7xx.h @@ -0,0 +1,41 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* SC16IS7xx SPI/I2C tty serial driver */ + +#ifndef _SC16IS7XX_H_ +#define _SC16IS7XX_H_ + +#include <linux/mod_devicetable.h> +#include <linux/regmap.h> +#include <linux/types.h> + +#define SC16IS7XX_NAME "sc16is7xx" +#define SC16IS7XX_MAX_PORTS 2 /* Maximum number of UART ports per IC. */ + +struct device; + +struct sc16is7xx_devtype { + char name[10]; + int nr_gpio; + int nr_uart; +}; + +extern const struct regmap_config sc16is7xx_regcfg; + +extern const struct of_device_id sc16is7xx_dt_ids[]; + +extern const struct sc16is7xx_devtype sc16is74x_devtype; +extern const struct sc16is7xx_devtype sc16is750_devtype; +extern const struct sc16is7xx_devtype sc16is752_devtype; +extern const struct sc16is7xx_devtype sc16is760_devtype; +extern const struct sc16is7xx_devtype sc16is762_devtype; + +const char *sc16is7xx_regmap_name(u8 port_id); + +unsigned int sc16is7xx_regmap_port_mask(unsigned int port_id); + +int sc16is7xx_probe(struct device *dev, const struct sc16is7xx_devtype *devtype, + struct regmap *regmaps[], int irq); + +void sc16is7xx_remove(struct device *dev); + +#endif /* _SC16IS7XX_H_ */ diff --git a/drivers/tty/serial/sc16is7xx_i2c.c b/drivers/tty/serial/sc16is7xx_i2c.c new file mode 100644 index 0000000000..3ed47c306d --- /dev/null +++ b/drivers/tty/serial/sc16is7xx_i2c.c @@ -0,0 +1,67 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* SC16IS7xx I2C interface driver */ + +#include <linux/dev_printk.h> +#include <linux/i2c.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/string.h> + +#include "sc16is7xx.h" + +static int sc16is7xx_i2c_probe(struct i2c_client *i2c) +{ + const struct sc16is7xx_devtype *devtype; + struct regmap *regmaps[SC16IS7XX_MAX_PORTS]; + struct regmap_config regcfg; + unsigned int i; + + devtype = i2c_get_match_data(i2c); + if (!devtype) + return dev_err_probe(&i2c->dev, -ENODEV, "Failed to match device\n"); + + memcpy(®cfg, &sc16is7xx_regcfg, sizeof(struct regmap_config)); + + for (i = 0; i < devtype->nr_uart; i++) { + regcfg.name = sc16is7xx_regmap_name(i); + regcfg.read_flag_mask = sc16is7xx_regmap_port_mask(i); + regcfg.write_flag_mask = sc16is7xx_regmap_port_mask(i); + regmaps[i] = devm_regmap_init_i2c(i2c, ®cfg); + } + + return sc16is7xx_probe(&i2c->dev, devtype, regmaps, i2c->irq); +} + +static void sc16is7xx_i2c_remove(struct i2c_client *client) +{ + sc16is7xx_remove(&client->dev); +} + +static const struct i2c_device_id sc16is7xx_i2c_id_table[] = { + { "sc16is74x", (kernel_ulong_t)&sc16is74x_devtype, }, + { "sc16is740", (kernel_ulong_t)&sc16is74x_devtype, }, + { "sc16is741", (kernel_ulong_t)&sc16is74x_devtype, }, + { "sc16is750", (kernel_ulong_t)&sc16is750_devtype, }, + { "sc16is752", (kernel_ulong_t)&sc16is752_devtype, }, + { "sc16is760", (kernel_ulong_t)&sc16is760_devtype, }, + { "sc16is762", (kernel_ulong_t)&sc16is762_devtype, }, + { } +}; +MODULE_DEVICE_TABLE(i2c, sc16is7xx_i2c_id_table); + +static struct i2c_driver sc16is7xx_i2c_driver = { + .driver = { + .name = SC16IS7XX_NAME, + .of_match_table = sc16is7xx_dt_ids, + }, + .probe = sc16is7xx_i2c_probe, + .remove = sc16is7xx_i2c_remove, + .id_table = sc16is7xx_i2c_id_table, +}; + +module_i2c_driver(sc16is7xx_i2c_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("SC16IS7xx I2C interface driver"); +MODULE_IMPORT_NS(SERIAL_NXP_SC16IS7XX); diff --git a/drivers/tty/serial/sc16is7xx_spi.c b/drivers/tty/serial/sc16is7xx_spi.c new file mode 100644 index 0000000000..73df36f8a7 --- /dev/null +++ b/drivers/tty/serial/sc16is7xx_spi.c @@ -0,0 +1,90 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* SC16IS7xx SPI interface driver */ + +#include <linux/dev_printk.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/spi/spi.h> +#include <linux/string.h> +#include <linux/units.h> + +#include "sc16is7xx.h" + +/* SPI definitions */ +#define SC16IS7XX_SPI_READ_BIT BIT(7) + +static int sc16is7xx_spi_probe(struct spi_device *spi) +{ + const struct sc16is7xx_devtype *devtype; + struct regmap *regmaps[SC16IS7XX_MAX_PORTS]; + struct regmap_config regcfg; + unsigned int i; + int ret; + + /* Setup SPI bus */ + spi->bits_per_word = 8; + /* For all variants, only mode 0 is supported */ + if ((spi->mode & SPI_MODE_X_MASK) != SPI_MODE_0) + return dev_err_probe(&spi->dev, -EINVAL, "Unsupported SPI mode\n"); + + spi->mode = spi->mode ? : SPI_MODE_0; + spi->max_speed_hz = spi->max_speed_hz ? : 4 * HZ_PER_MHZ; + ret = spi_setup(spi); + if (ret) + return ret; + + devtype = spi_get_device_match_data(spi); + if (!devtype) + return dev_err_probe(&spi->dev, -ENODEV, "Failed to match device\n"); + + memcpy(®cfg, &sc16is7xx_regcfg, sizeof(struct regmap_config)); + + for (i = 0; i < devtype->nr_uart; i++) { + regcfg.name = sc16is7xx_regmap_name(i); + /* + * If read_flag_mask is 0, the regmap code sets it to a default + * of 0x80. Since we specify our own mask, we must add the READ + * bit ourselves: + */ + regcfg.read_flag_mask = sc16is7xx_regmap_port_mask(i) | + SC16IS7XX_SPI_READ_BIT; + regcfg.write_flag_mask = sc16is7xx_regmap_port_mask(i); + regmaps[i] = devm_regmap_init_spi(spi, ®cfg); + } + + return sc16is7xx_probe(&spi->dev, devtype, regmaps, spi->irq); +} + +static void sc16is7xx_spi_remove(struct spi_device *spi) +{ + sc16is7xx_remove(&spi->dev); +} + +static const struct spi_device_id sc16is7xx_spi_id_table[] = { + { "sc16is74x", (kernel_ulong_t)&sc16is74x_devtype, }, + { "sc16is740", (kernel_ulong_t)&sc16is74x_devtype, }, + { "sc16is741", (kernel_ulong_t)&sc16is74x_devtype, }, + { "sc16is750", (kernel_ulong_t)&sc16is750_devtype, }, + { "sc16is752", (kernel_ulong_t)&sc16is752_devtype, }, + { "sc16is760", (kernel_ulong_t)&sc16is760_devtype, }, + { "sc16is762", (kernel_ulong_t)&sc16is762_devtype, }, + { } +}; +MODULE_DEVICE_TABLE(spi, sc16is7xx_spi_id_table); + +static struct spi_driver sc16is7xx_spi_driver = { + .driver = { + .name = SC16IS7XX_NAME, + .of_match_table = sc16is7xx_dt_ids, + }, + .probe = sc16is7xx_spi_probe, + .remove = sc16is7xx_spi_remove, + .id_table = sc16is7xx_spi_id_table, +}; + +module_spi_driver(sc16is7xx_spi_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("SC16IS7xx SPI interface driver"); +MODULE_IMPORT_NS(SERIAL_NXP_SC16IS7XX); diff --git a/drivers/tty/serial/sccnxp.c b/drivers/tty/serial/sccnxp.c index f24217a560..6d1d142fd2 100644 --- a/drivers/tty/serial/sccnxp.c +++ b/drivers/tty/serial/sccnxp.c @@ -439,7 +439,7 @@ static void sccnxp_handle_rx(struct uart_port *port) static void sccnxp_handle_tx(struct uart_port *port) { u8 sr; - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; struct sccnxp_port *s = dev_get_drvdata(port->dev); if (unlikely(port->x_char)) { @@ -449,7 +449,7 @@ static void sccnxp_handle_tx(struct uart_port *port) return; } - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { + if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) { /* Disable TX if FIFO is empty */ if (sccnxp_port_read(port, SCCNXP_SR_REG) & SR_TXEMT) { sccnxp_disable_irq(port, IMR_TXRDY); @@ -461,16 +461,20 @@ static void sccnxp_handle_tx(struct uart_port *port) return; } - while (!uart_circ_empty(xmit)) { + while (1) { + unsigned char ch; + sr = sccnxp_port_read(port, SCCNXP_SR_REG); if (!(sr & SR_TXRDY)) break; - sccnxp_port_write(port, SCCNXP_THR_REG, xmit->buf[xmit->tail]); - uart_xmit_advance(port, 1); + if (!uart_fifo_get(port, &ch)) + break; + + sccnxp_port_write(port, SCCNXP_THR_REG, ch); } - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); } diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c index 525f3a2f7b..1183ca54ab 100644 --- a/drivers/tty/serial/serial-tegra.c +++ b/drivers/tty/serial/serial-tegra.c @@ -484,18 +484,18 @@ static void tegra_uart_release_port(struct uart_port *u) static void tegra_uart_fill_tx_fifo(struct tegra_uart_port *tup, int max_bytes) { - struct circ_buf *xmit = &tup->uport.state->xmit; + unsigned char ch; int i; for (i = 0; i < max_bytes; i++) { - BUG_ON(uart_circ_empty(xmit)); if (tup->cdata->tx_fifo_full_status) { unsigned long lsr = tegra_uart_read(tup, UART_LSR); if ((lsr & TEGRA_UART_LSR_TXFIFO_FULL)) break; } - tegra_uart_write(tup, xmit->buf[xmit->tail], UART_TX); - uart_xmit_advance(&tup->uport, 1); + if (WARN_ON_ONCE(!uart_fifo_get(&tup->uport, &ch))) + break; + tegra_uart_write(tup, ch, UART_TX); } } @@ -514,7 +514,7 @@ static void tegra_uart_start_pio_tx(struct tegra_uart_port *tup, static void tegra_uart_tx_dma_complete(void *args) { struct tegra_uart_port *tup = args; - struct circ_buf *xmit = &tup->uport.state->xmit; + struct tty_port *tport = &tup->uport.state->port; struct dma_tx_state state; unsigned long flags; unsigned int count; @@ -525,7 +525,7 @@ static void tegra_uart_tx_dma_complete(void *args) uart_port_lock_irqsave(&tup->uport, &flags); uart_xmit_advance(&tup->uport, count); tup->tx_in_progress = 0; - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(&tup->uport); tegra_uart_start_next_tx(tup); uart_port_unlock_irqrestore(&tup->uport, flags); @@ -534,11 +534,14 @@ static void tegra_uart_tx_dma_complete(void *args) static int tegra_uart_start_tx_dma(struct tegra_uart_port *tup, unsigned long count) { - struct circ_buf *xmit = &tup->uport.state->xmit; + struct tty_port *tport = &tup->uport.state->port; dma_addr_t tx_phys_addr; + unsigned int tail; tup->tx_bytes = count & ~(0xF); - tx_phys_addr = tup->tx_dma_buf_phys + xmit->tail; + WARN_ON_ONCE(kfifo_out_linear(&tport->xmit_fifo, &tail, + UART_XMIT_SIZE) < count); + tx_phys_addr = tup->tx_dma_buf_phys + tail; dma_sync_single_for_device(tup->uport.dev, tx_phys_addr, tup->tx_bytes, DMA_TO_DEVICE); @@ -562,18 +565,21 @@ static int tegra_uart_start_tx_dma(struct tegra_uart_port *tup, static void tegra_uart_start_next_tx(struct tegra_uart_port *tup) { + struct tty_port *tport = &tup->uport.state->port; + unsigned char *tail_ptr; unsigned long tail; - unsigned long count; - struct circ_buf *xmit = &tup->uport.state->xmit; + unsigned int count; if (!tup->current_baud) return; - tail = (unsigned long)&xmit->buf[xmit->tail]; - count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); + count = kfifo_out_linear_ptr(&tport->xmit_fifo, &tail_ptr, + UART_XMIT_SIZE); if (!count) return; + tail = (unsigned long)tail_ptr; + if (tup->use_tx_pio || count < TEGRA_UART_MIN_DMA) tegra_uart_start_pio_tx(tup, count); else if (BYTES_TO_ALIGN(tail) > 0) @@ -586,9 +592,9 @@ static void tegra_uart_start_next_tx(struct tegra_uart_port *tup) static void tegra_uart_start_tx(struct uart_port *u) { struct tegra_uart_port *tup = to_tegra_uport(u); - struct circ_buf *xmit = &u->state->xmit; + struct tty_port *tport = &u->state->port; - if (!uart_circ_empty(xmit) && !tup->tx_in_progress) + if (!kfifo_is_empty(&tport->xmit_fifo) && !tup->tx_in_progress) tegra_uart_start_next_tx(tup); } @@ -628,11 +634,11 @@ static void tegra_uart_stop_tx(struct uart_port *u) static void tegra_uart_handle_tx_pio(struct tegra_uart_port *tup) { - struct circ_buf *xmit = &tup->uport.state->xmit; + struct tty_port *tport = &tup->uport.state->port; tegra_uart_fill_tx_fifo(tup, tup->tx_bytes); tup->tx_in_progress = 0; - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(&tup->uport); tegra_uart_start_next_tx(tup); } @@ -1169,15 +1175,14 @@ static int tegra_uart_dma_channel_allocate(struct tegra_uart_port *tup, tup->rx_dma_buf_virt = dma_buf; tup->rx_dma_buf_phys = dma_phys; } else { + dma_buf = tup->uport.state->port.xmit_buf; dma_phys = dma_map_single(tup->uport.dev, - tup->uport.state->xmit.buf, UART_XMIT_SIZE, - DMA_TO_DEVICE); + dma_buf, UART_XMIT_SIZE, DMA_TO_DEVICE); if (dma_mapping_error(tup->uport.dev, dma_phys)) { dev_err(tup->uport.dev, "dma_map_single tx failed\n"); dma_release_channel(dma_chan); return -ENOMEM; } - dma_buf = tup->uport.state->xmit.buf; dma_sconfig.dst_addr = tup->uport.mapbase; dma_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; dma_sconfig.dst_maxburst = 16; diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index c476d88435..2a8006e3d6 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -243,25 +243,12 @@ static void uart_change_line_settings(struct tty_struct *tty, struct uart_state uart_port_unlock_irq(uport); } -/* - * Startup the port. This will be called once per open. All calls - * will be serialised by the per-port mutex. - */ -static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, - bool init_hw) +static int uart_alloc_xmit_buf(struct tty_port *port) { - struct uart_port *uport = uart_port_check(state); + struct uart_state *state = container_of(port, struct uart_state, port); + struct uart_port *uport; unsigned long flags; unsigned long page; - int retval = 0; - - if (uport->type == PORT_UNKNOWN) - return 1; - - /* - * Make sure the device is in D0 state. - */ - uart_change_pm(state, UART_PM_STATE_ON); /* * Initialise and allocate the transmit and temporary @@ -271,20 +258,68 @@ static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, if (!page) return -ENOMEM; - uart_port_lock(state, flags); - if (!state->xmit.buf) { - state->xmit.buf = (unsigned char *) page; - uart_circ_clear(&state->xmit); + uport = uart_port_lock(state, flags); + if (!state->port.xmit_buf) { + state->port.xmit_buf = (unsigned char *)page; + kfifo_init(&state->port.xmit_fifo, state->port.xmit_buf, + PAGE_SIZE); uart_port_unlock(uport, flags); } else { uart_port_unlock(uport, flags); /* * Do not free() the page under the port lock, see - * uart_shutdown(). + * uart_free_xmit_buf(). */ free_page(page); } + return 0; +} + +static void uart_free_xmit_buf(struct tty_port *port) +{ + struct uart_state *state = container_of(port, struct uart_state, port); + struct uart_port *uport; + unsigned long flags; + char *xmit_buf; + + /* + * Do not free() the transmit buffer page under the port lock since + * this can create various circular locking scenarios. For instance, + * console driver may need to allocate/free a debug object, which + * can end up in printk() recursion. + */ + uport = uart_port_lock(state, flags); + xmit_buf = port->xmit_buf; + port->xmit_buf = NULL; + INIT_KFIFO(port->xmit_fifo); + uart_port_unlock(uport, flags); + + free_page((unsigned long)xmit_buf); +} + +/* + * Startup the port. This will be called once per open. All calls + * will be serialised by the per-port mutex. + */ +static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, + bool init_hw) +{ + struct uart_port *uport = uart_port_check(state); + int retval; + + if (uport->type == PORT_UNKNOWN) + return 1; + + /* + * Make sure the device is in D0 state. + */ + uart_change_pm(state, UART_PM_STATE_ON); + + retval = uart_alloc_xmit_buf(&state->port); + if (retval) + return retval; + retval = uport->ops->startup(uport); if (retval == 0) { if (uart_console(uport) && uport->cons->cflag) { @@ -356,8 +391,6 @@ static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) { struct uart_port *uport = uart_port_check(state); struct tty_port *port = &state->port; - unsigned long flags; - char *xmit_buf = NULL; /* * Set the TTY IO error marker @@ -393,18 +426,7 @@ static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) */ tty_port_set_suspended(port, false); - /* - * Do not free() the transmit buffer page under the port lock since - * this can create various circular locking scenarios. For instance, - * console driver may need to allocate/free a debug object, which - * can endup in printk() recursion. - */ - uart_port_lock(state, flags); - xmit_buf = state->xmit.buf; - state->xmit.buf = NULL; - uart_port_unlock(uport, flags); - - free_page((unsigned long)xmit_buf); + uart_free_xmit_buf(port); } /** @@ -565,22 +587,17 @@ static int uart_put_char(struct tty_struct *tty, u8 c) { struct uart_state *state = tty->driver_data; struct uart_port *port; - struct circ_buf *circ; unsigned long flags; int ret = 0; - circ = &state->xmit; port = uart_port_lock(state, flags); - if (!circ->buf) { + if (!state->port.xmit_buf) { uart_port_unlock(port, flags); return 0; } - if (port && uart_circ_chars_free(circ) != 0) { - circ->buf[circ->head] = c; - circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); - ret = 1; - } + if (port) + ret = kfifo_put(&state->port.xmit_fifo, c); uart_port_unlock(port, flags); return ret; } @@ -594,9 +611,8 @@ static ssize_t uart_write(struct tty_struct *tty, const u8 *buf, size_t count) { struct uart_state *state = tty->driver_data; struct uart_port *port; - struct circ_buf *circ; unsigned long flags; - int c, ret = 0; + int ret = 0; /* * This means you called this function _after_ the port was @@ -606,24 +622,13 @@ static ssize_t uart_write(struct tty_struct *tty, const u8 *buf, size_t count) return -EL3HLT; port = uart_port_lock(state, flags); - circ = &state->xmit; - if (!circ->buf) { + if (!state->port.xmit_buf) { uart_port_unlock(port, flags); return 0; } - while (port) { - c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); - if (count < c) - c = count; - if (c <= 0) - break; - memcpy(circ->buf + circ->head, buf, c); - circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); - buf += c; - count -= c; - ret += c; - } + if (port) + ret = kfifo_in(&state->port.xmit_fifo, buf, count); __uart_start(state); uart_port_unlock(port, flags); @@ -638,7 +643,7 @@ static unsigned int uart_write_room(struct tty_struct *tty) unsigned int ret; port = uart_port_lock(state, flags); - ret = uart_circ_chars_free(&state->xmit); + ret = kfifo_avail(&state->port.xmit_fifo); uart_port_unlock(port, flags); return ret; } @@ -651,7 +656,7 @@ static unsigned int uart_chars_in_buffer(struct tty_struct *tty) unsigned int ret; port = uart_port_lock(state, flags); - ret = uart_circ_chars_pending(&state->xmit); + ret = kfifo_len(&state->port.xmit_fifo); uart_port_unlock(port, flags); return ret; } @@ -674,7 +679,7 @@ static void uart_flush_buffer(struct tty_struct *tty) port = uart_port_lock(state, flags); if (!port) return; - uart_circ_clear(&state->xmit); + kfifo_reset(&state->port.xmit_fifo); if (port->ops->flush_buffer) port->ops->flush_buffer(port); uart_port_unlock(port, flags); @@ -1077,7 +1082,7 @@ static int uart_get_lsr_info(struct tty_struct *tty, * interrupt happens). */ if (uport->x_char || - ((uart_circ_chars_pending(&state->xmit) > 0) && + (!kfifo_is_empty(&state->port.xmit_fifo) && !uart_tx_stopped(uport))) result &= ~TIOCSER_TEMT; @@ -1775,7 +1780,6 @@ static void uart_tty_port_shutdown(struct tty_port *port) { struct uart_state *state = container_of(port, struct uart_state, port); struct uart_port *uport = uart_port_check(state); - char *buf; /* * At this point, we stop accepting input. To do this, we @@ -1798,16 +1802,7 @@ static void uart_tty_port_shutdown(struct tty_port *port) */ tty_port_set_suspended(port, false); - /* - * Free the transmit buffer. - */ - uart_port_lock_irq(uport); - uart_circ_clear(&state->xmit); - buf = state->xmit.buf; - state->xmit.buf = NULL; - uart_port_unlock_irq(uport); - - free_page((unsigned long)buf); + uart_free_xmit_buf(port); uart_change_pm(state, UART_PM_STATE_OFF); } @@ -2413,6 +2408,7 @@ int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) uport->ops->stop_rx(uport); uart_port_unlock_irq(uport); } + device_set_awake_path(uport->dev); goto unlock; } @@ -3211,6 +3207,9 @@ static int serial_core_add_one_port(struct uart_driver *drv, struct uart_port *u if (uport->attr_group) uport->tty_groups[1] = uport->attr_group; + /* Ensure serdev drivers can call serdev_device_open() right away */ + uport->flags &= ~UPF_DEAD; + /* * Register the port whether it's detected or not. This allows * setserial to be used to alter this port's parameters. @@ -3221,6 +3220,7 @@ static int serial_core_add_one_port(struct uart_driver *drv, struct uart_port *u if (!IS_ERR(tty_dev)) { device_set_wakeup_capable(tty_dev, 1); } else { + uport->flags |= UPF_DEAD; dev_err(uport->dev, "Cannot register tty device on line %d\n", uport->line); } @@ -3426,8 +3426,6 @@ int serial_core_register_port(struct uart_driver *drv, struct uart_port *port) if (ret) goto err_unregister_port_dev; - port->flags &= ~UPF_DEAD; - mutex_unlock(&port_mutex); return 0; diff --git a/drivers/tty/serial/serial_port.c b/drivers/tty/serial/serial_port.c index 66fd117d8a..d35f1d2415 100644 --- a/drivers/tty/serial/serial_port.c +++ b/drivers/tty/serial/serial_port.c @@ -11,6 +11,7 @@ #include <linux/of.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> +#include <linux/pnp.h> #include <linux/property.h> #include <linux/serial_core.h> #include <linux/spinlock.h> @@ -23,7 +24,7 @@ static int __serial_port_busy(struct uart_port *port) { return !uart_tx_stopped(port) && - uart_circ_chars_pending(&port->state->xmit); + !kfifo_is_empty(&port->state->port.xmit_fifo); } static int serial_port_runtime_resume(struct device *dev) @@ -262,7 +263,11 @@ static int __uart_read_properties(struct uart_port *port, bool use_defaults) if (dev_is_platform(dev)) ret = platform_get_irq(to_platform_device(dev), 0); - else + else if (dev_is_pnp(dev)) { + ret = pnp_irq(to_pnp_dev(dev), 0); + if (ret < 0) + ret = -ENXIO; + } else ret = fwnode_irq_get(dev_fwnode(dev), 0); if (ret == -EPROBE_DEFER) return ret; diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index a6f3517dce..f738980a8b 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -585,7 +585,7 @@ static void sci_start_tx(struct uart_port *port) sci_serial_out(port, SCSCR, new); } - if (s->chan_tx && !uart_circ_empty(&s->port.state->xmit) && + if (s->chan_tx && !kfifo_is_empty(&port->state->port.xmit_fifo) && dma_submit_error(s->cookie_tx)) { if (s->cfg->regtype == SCIx_RZ_SCIFA_REGTYPE) /* Switch irq from SCIF to DMA */ @@ -817,7 +817,7 @@ static int sci_rxfill(struct uart_port *port) static void sci_transmit_chars(struct uart_port *port) { - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; unsigned int stopped = uart_tx_stopped(port); unsigned short status; unsigned short ctrl; @@ -826,7 +826,7 @@ static void sci_transmit_chars(struct uart_port *port) status = sci_serial_in(port, SCxSR); if (!(status & SCxSR_TDxE(port))) { ctrl = sci_serial_in(port, SCSCR); - if (uart_circ_empty(xmit)) + if (kfifo_is_empty(&tport->xmit_fifo)) ctrl &= ~SCSCR_TIE; else ctrl |= SCSCR_TIE; @@ -842,15 +842,14 @@ static void sci_transmit_chars(struct uart_port *port) if (port->x_char) { c = port->x_char; port->x_char = 0; - } else if (!uart_circ_empty(xmit) && !stopped) { - c = xmit->buf[xmit->tail]; - xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); - } else if (port->type == PORT_SCI && uart_circ_empty(xmit)) { - ctrl = sci_serial_in(port, SCSCR); - ctrl &= ~SCSCR_TE; - sci_serial_out(port, SCSCR, ctrl); - return; - } else { + } else if (stopped || !kfifo_get(&tport->xmit_fifo, &c)) { + if (port->type == PORT_SCI && + kfifo_is_empty(&tport->xmit_fifo)) { + ctrl = sci_serial_in(port, SCSCR); + ctrl &= ~SCSCR_TE; + sci_serial_out(port, SCSCR, ctrl); + return; + } break; } @@ -861,9 +860,9 @@ static void sci_transmit_chars(struct uart_port *port) sci_clear_SCxSR(port, SCxSR_TDxE_CLEAR(port)); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); - if (uart_circ_empty(xmit)) { + if (kfifo_is_empty(&tport->xmit_fifo)) { if (port->type == PORT_SCI) { ctrl = sci_serial_in(port, SCSCR); ctrl &= ~SCSCR_TIE; @@ -1199,7 +1198,7 @@ static void sci_dma_tx_complete(void *arg) { struct sci_port *s = arg; struct uart_port *port = &s->port; - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; unsigned long flags; dev_dbg(port->dev, "%s(%d)\n", __func__, port->line); @@ -1208,10 +1207,10 @@ static void sci_dma_tx_complete(void *arg) uart_xmit_advance(port, s->tx_dma_len); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); - if (!uart_circ_empty(xmit)) { + if (!kfifo_is_empty(&tport->xmit_fifo)) { s->cookie_tx = 0; schedule_work(&s->work_tx); } else { @@ -1258,6 +1257,7 @@ static int sci_dma_rx_find_active(struct sci_port *s) return -1; } +/* Must only be called with uart_port_lock taken */ static void sci_dma_rx_chan_invalidate(struct sci_port *s) { unsigned int i; @@ -1324,14 +1324,14 @@ static void sci_dma_rx_complete(void *arg) dev_dbg(port->dev, "%s(%d) active cookie %d\n", __func__, port->line, s->active_rx); + hrtimer_cancel(&s->rx_timer); + uart_port_lock_irqsave(port, &flags); active = sci_dma_rx_find_active(s); if (active >= 0) count = sci_dma_rx_push(s, s->rx_buf[active], s->buf_len_rx); - start_hrtimer_us(&s->rx_timer, s->rx_timeout); - if (count) tty_flip_buffer_push(&port->state->port); @@ -1354,17 +1354,18 @@ static void sci_dma_rx_complete(void *arg) uart_port_unlock_irqrestore(port, flags); dev_dbg(port->dev, "%s: cookie %d #%d, new active cookie %d\n", __func__, s->cookie_rx[active], active, s->active_rx); + + start_hrtimer_us(&s->rx_timer, s->rx_timeout); + return; fail: - uart_port_unlock_irqrestore(port, flags); - dev_warn(port->dev, "Failed submitting Rx DMA descriptor\n"); /* Switch to PIO */ - uart_port_lock_irqsave(port, &flags); dmaengine_terminate_async(chan); sci_dma_rx_chan_invalidate(s); sci_dma_rx_reenable_irq(s); uart_port_unlock_irqrestore(port, flags); + dev_warn(port->dev, "Failed submitting Rx DMA descriptor\n"); } static void sci_dma_tx_release(struct sci_port *s) @@ -1429,10 +1430,10 @@ static void sci_dma_tx_work_fn(struct work_struct *work) struct dma_async_tx_descriptor *desc; struct dma_chan *chan = s->chan_tx; struct uart_port *port = &s->port; - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; unsigned long flags; + unsigned int tail; dma_addr_t buf; - int head, tail; /* * DMA is idle now. @@ -1442,10 +1443,9 @@ static void sci_dma_tx_work_fn(struct work_struct *work) * consistent xmit buffer state. */ uart_port_lock_irq(port); - head = xmit->head; - tail = xmit->tail; + s->tx_dma_len = kfifo_out_linear(&tport->xmit_fifo, &tail, + UART_XMIT_SIZE); buf = s->tx_dma_addr + tail; - s->tx_dma_len = CIRC_CNT_TO_END(head, tail, UART_XMIT_SIZE); if (!s->tx_dma_len) { /* Transmit buffer has been flushed */ uart_port_unlock_irq(port); @@ -1474,8 +1474,8 @@ static void sci_dma_tx_work_fn(struct work_struct *work) } uart_port_unlock_irq(port); - dev_dbg(port->dev, "%s: %p: %d...%d, cookie %d\n", - __func__, xmit->buf, tail, head, s->cookie_tx); + dev_dbg(port->dev, "%s: %p: %u, cookie %d\n", + __func__, tport->xmit_buf, tail, s->cookie_tx); dma_async_issue_pending(chan); return; @@ -1590,6 +1590,7 @@ static struct dma_chan *sci_request_dma_chan(struct uart_port *port, static void sci_request_dma(struct uart_port *port) { struct sci_port *s = to_sci_port(port); + struct tty_port *tport = &port->state->port; struct dma_chan *chan; dev_dbg(port->dev, "%s: port %d\n", __func__, port->line); @@ -1618,7 +1619,7 @@ static void sci_request_dma(struct uart_port *port) if (chan) { /* UART circular tx buffer is an aligned page. */ s->tx_dma_addr = dma_map_single(chan->device->dev, - port->state->xmit.buf, + tport->xmit_buf, UART_XMIT_SIZE, DMA_TO_DEVICE); if (dma_mapping_error(chan->device->dev, s->tx_dma_addr)) { @@ -1627,7 +1628,7 @@ static void sci_request_dma(struct uart_port *port) } else { dev_dbg(port->dev, "%s: mapped %lu@%p to %pad\n", __func__, UART_XMIT_SIZE, - port->state->xmit.buf, &s->tx_dma_addr); + tport->xmit_buf, &s->tx_dma_addr); INIT_WORK(&s->work_tx, sci_dma_tx_work_fn); s->chan_tx_saved = s->chan_tx = chan; diff --git a/drivers/tty/serial/sifive.c b/drivers/tty/serial/sifive.c index 0670fd9f84..cbfce65c9d 100644 --- a/drivers/tty/serial/sifive.c +++ b/drivers/tty/serial/sifive.c @@ -761,7 +761,7 @@ static int __init early_sifive_serial_setup(struct earlycon_device *dev, } OF_EARLYCON_DECLARE(sifive, "sifive,uart0", early_sifive_serial_setup); -OF_EARLYCON_DECLARE(sifive, "sifive,fu540-c000-uart0", +OF_EARLYCON_DECLARE(sifive, "sifive,fu540-c000-uart", early_sifive_serial_setup); #endif /* CONFIG_SERIAL_EARLYCON */ @@ -1032,7 +1032,7 @@ static DEFINE_SIMPLE_DEV_PM_OPS(sifive_uart_pm_ops, sifive_serial_suspend, sifive_serial_resume); static const struct of_device_id sifive_serial_of_match[] = { - { .compatible = "sifive,fu540-c000-uart0" }, + { .compatible = "sifive,fu540-c000-uart" }, { .compatible = "sifive,uart0" }, {}, }; diff --git a/drivers/tty/serial/sprd_serial.c b/drivers/tty/serial/sprd_serial.c index 15f14fa593..3fc54cc02a 100644 --- a/drivers/tty/serial/sprd_serial.c +++ b/drivers/tty/serial/sprd_serial.c @@ -227,13 +227,13 @@ static int sprd_tx_buf_remap(struct uart_port *port) { struct sprd_uart_port *sp = container_of(port, struct sprd_uart_port, port); - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; + unsigned char *tail; - sp->tx_dma.trans_len = - CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); + sp->tx_dma.trans_len = kfifo_out_linear_ptr(&tport->xmit_fifo, &tail, + UART_XMIT_SIZE); - sp->tx_dma.phys_addr = dma_map_single(port->dev, - (void *)&(xmit->buf[xmit->tail]), + sp->tx_dma.phys_addr = dma_map_single(port->dev, tail, sp->tx_dma.trans_len, DMA_TO_DEVICE); return dma_mapping_error(port->dev, sp->tx_dma.phys_addr); @@ -244,7 +244,7 @@ static void sprd_complete_tx_dma(void *data) struct uart_port *port = (struct uart_port *)data; struct sprd_uart_port *sp = container_of(port, struct sprd_uart_port, port); - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; unsigned long flags; uart_port_lock_irqsave(port, &flags); @@ -253,10 +253,10 @@ static void sprd_complete_tx_dma(void *data) uart_xmit_advance(port, sp->tx_dma.trans_len); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); - if (uart_circ_empty(xmit) || sprd_tx_buf_remap(port) || + if (kfifo_is_empty(&tport->xmit_fifo) || sprd_tx_buf_remap(port) || sprd_tx_dma_config(port)) sp->tx_dma.trans_len = 0; @@ -319,7 +319,7 @@ static void sprd_start_tx_dma(struct uart_port *port) { struct sprd_uart_port *sp = container_of(port, struct sprd_uart_port, port); - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; if (port->x_char) { serial_out(port, SPRD_TXD, port->x_char); @@ -328,7 +328,7 @@ static void sprd_start_tx_dma(struct uart_port *port) return; } - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { + if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) { sprd_stop_tx_dma(port); return; } diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c index a23e595518..f91753a40a 100644 --- a/drivers/tty/serial/st-asc.c +++ b/drivers/tty/serial/st-asc.c @@ -387,9 +387,9 @@ static unsigned int asc_get_mctrl(struct uart_port *port) /* There are probably characters waiting to be transmitted. */ static void asc_start_tx(struct uart_port *port) { - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; - if (!uart_circ_empty(xmit)) + if (!kfifo_is_empty(&tport->xmit_fifo)) asc_enable_tx_interrupts(port); } diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c index 4fa5a03eba..e1e7bc04c5 100644 --- a/drivers/tty/serial/stm32-usart.c +++ b/drivers/tty/serial/stm32-usart.c @@ -696,18 +696,23 @@ static void stm32_usart_transmit_chars_pio(struct uart_port *port) { struct stm32_port *stm32_port = to_stm32_port(port); const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs; - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; + + while (1) { + unsigned char ch; - while (!uart_circ_empty(xmit)) { /* Check that TDR is empty before filling FIFO */ if (!(readl_relaxed(port->membase + ofs->isr) & USART_SR_TXE)) break; - writel_relaxed(xmit->buf[xmit->tail], port->membase + ofs->tdr); - uart_xmit_advance(port, 1); + + if (!uart_fifo_get(port, &ch)) + break; + + writel_relaxed(ch, port->membase + ofs->tdr); } /* rely on TXE irq (mask or unmask) for sending remaining data */ - if (uart_circ_empty(xmit)) + if (kfifo_is_empty(&tport->xmit_fifo)) stm32_usart_tx_interrupt_disable(port); else stm32_usart_tx_interrupt_enable(port); @@ -716,7 +721,7 @@ static void stm32_usart_transmit_chars_pio(struct uart_port *port) static void stm32_usart_transmit_chars_dma(struct uart_port *port) { struct stm32_port *stm32port = to_stm32_port(port); - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; struct dma_async_tx_descriptor *desc = NULL; unsigned int count; int ret; @@ -728,25 +733,8 @@ static void stm32_usart_transmit_chars_dma(struct uart_port *port) return; } - count = uart_circ_chars_pending(xmit); - - if (count > TX_BUF_L) - count = TX_BUF_L; - - if (xmit->tail < xmit->head) { - memcpy(&stm32port->tx_buf[0], &xmit->buf[xmit->tail], count); - } else { - size_t one = UART_XMIT_SIZE - xmit->tail; - size_t two; - - if (one > count) - one = count; - two = count - one; - - memcpy(&stm32port->tx_buf[0], &xmit->buf[xmit->tail], one); - if (two) - memcpy(&stm32port->tx_buf[one], &xmit->buf[0], two); - } + count = kfifo_out_peek(&tport->xmit_fifo, &stm32port->tx_buf[0], + TX_BUF_L); desc = dmaengine_prep_slave_single(stm32port->tx_ch, stm32port->tx_dma_buf, @@ -792,14 +780,14 @@ static void stm32_usart_transmit_chars(struct uart_port *port) { struct stm32_port *stm32_port = to_stm32_port(port); const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs; - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; u32 isr; int ret; if (!stm32_port->hw_flow_control && port->rs485.flags & SER_RS485_ENABLED && (port->x_char || - !(uart_circ_empty(xmit) || uart_tx_stopped(port)))) { + !(kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)))) { stm32_usart_tc_interrupt_disable(port); stm32_usart_rs485_rts_enable(port); } @@ -826,7 +814,7 @@ static void stm32_usart_transmit_chars(struct uart_port *port) return; } - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { + if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) { stm32_usart_tx_interrupt_disable(port); return; } @@ -841,10 +829,10 @@ static void stm32_usart_transmit_chars(struct uart_port *port) else stm32_usart_transmit_chars_pio(port); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); - if (uart_circ_empty(xmit)) { + if (kfifo_is_empty(&tport->xmit_fifo)) { stm32_usart_tx_interrupt_disable(port); if (!stm32_port->hw_flow_control && port->rs485.flags & SER_RS485_ENABLED) { @@ -975,9 +963,9 @@ static void stm32_usart_stop_tx(struct uart_port *port) /* There are probably characters waiting to be transmitted. */ static void stm32_usart_start_tx(struct uart_port *port) { - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; - if (uart_circ_empty(xmit) && !port->x_char) { + if (kfifo_is_empty(&tport->xmit_fifo) && !port->x_char) { stm32_usart_rs485_rts_disable(port); return; } diff --git a/drivers/tty/serial/sunhv.c b/drivers/tty/serial/sunhv.c index 8d612ab806..7f60679fdd 100644 --- a/drivers/tty/serial/sunhv.c +++ b/drivers/tty/serial/sunhv.c @@ -39,10 +39,13 @@ static char *con_read_page; static int hung_up = 0; -static void transmit_chars_putchar(struct uart_port *port, struct circ_buf *xmit) +static void transmit_chars_putchar(struct uart_port *port, + struct tty_port *tport) { - while (!uart_circ_empty(xmit)) { - long status = sun4v_con_putchar(xmit->buf[xmit->tail]); + unsigned char ch; + + while (kfifo_peek(&tport->xmit_fifo, &ch)) { + long status = sun4v_con_putchar(ch); if (status != HV_EOK) break; @@ -51,14 +54,16 @@ static void transmit_chars_putchar(struct uart_port *port, struct circ_buf *xmit } } -static void transmit_chars_write(struct uart_port *port, struct circ_buf *xmit) +static void transmit_chars_write(struct uart_port *port, struct tty_port *tport) { - while (!uart_circ_empty(xmit)) { - unsigned long ra = __pa(xmit->buf + xmit->tail); - unsigned long len, status, sent; + while (!kfifo_is_empty(&tport->xmit_fifo)) { + unsigned long len, ra, status, sent; + unsigned char *tail; + + len = kfifo_out_linear_ptr(&tport->xmit_fifo, &tail, + UART_XMIT_SIZE); + ra = __pa(tail); - len = CIRC_CNT_TO_END(xmit->head, xmit->tail, - UART_XMIT_SIZE); status = sun4v_con_write(ra, len, &sent); if (status != HV_EOK) break; @@ -165,7 +170,7 @@ static int receive_chars_read(struct uart_port *port) } struct sunhv_ops { - void (*transmit_chars)(struct uart_port *port, struct circ_buf *xmit); + void (*transmit_chars)(struct uart_port *port, struct tty_port *tport); int (*receive_chars)(struct uart_port *port); }; @@ -196,18 +201,18 @@ static struct tty_port *receive_chars(struct uart_port *port) static void transmit_chars(struct uart_port *port) { - struct circ_buf *xmit; + struct tty_port *tport; if (!port->state) return; - xmit = &port->state->xmit; - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) + tport = &port->state->port; + if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) return; - sunhv_ops->transmit_chars(port, xmit); + sunhv_ops->transmit_chars(port, tport); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); } diff --git a/drivers/tty/serial/sunplus-uart.c b/drivers/tty/serial/sunplus-uart.c index f5e29eb4a4..abf7c44930 100644 --- a/drivers/tty/serial/sunplus-uart.c +++ b/drivers/tty/serial/sunplus-uart.c @@ -200,7 +200,7 @@ static void sunplus_break_ctl(struct uart_port *port, int ctl) static void transmit_chars(struct uart_port *port) { - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; if (port->x_char) { sp_uart_put_char(port, port->x_char); @@ -209,22 +209,24 @@ static void transmit_chars(struct uart_port *port) return; } - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { + if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) { sunplus_stop_tx(port); return; } do { - sp_uart_put_char(port, xmit->buf[xmit->tail]); - uart_xmit_advance(port, 1); - if (uart_circ_empty(xmit)) + unsigned char ch; + + if (!uart_fifo_get(port, &ch)) break; + + sp_uart_put_char(port, ch); } while (sunplus_tx_buf_not_full(port)); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); - if (uart_circ_empty(xmit)) + if (kfifo_is_empty(&tport->xmit_fifo)) sunplus_stop_tx(port); } diff --git a/drivers/tty/serial/sunsab.c b/drivers/tty/serial/sunsab.c index 1ea2f33a07..1acbe2fba7 100644 --- a/drivers/tty/serial/sunsab.c +++ b/drivers/tty/serial/sunsab.c @@ -232,7 +232,7 @@ static void sunsab_tx_idle(struct uart_sunsab_port *); static void transmit_chars(struct uart_sunsab_port *up, union sab82532_irq_status *stat) { - struct circ_buf *xmit = &up->port.state->xmit; + struct tty_port *tport = &up->port.state->port; int i; if (stat->sreg.isr1 & SAB82532_ISR1_ALLS) { @@ -252,7 +252,7 @@ static void transmit_chars(struct uart_sunsab_port *up, set_bit(SAB82532_XPR, &up->irqflags); sunsab_tx_idle(up); - if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) { + if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(&up->port)) { up->interrupt_mask1 |= SAB82532_IMR1_XPR; writeb(up->interrupt_mask1, &up->regs->w.imr1); return; @@ -265,21 +265,22 @@ static void transmit_chars(struct uart_sunsab_port *up, /* Stuff 32 bytes into Transmit FIFO. */ clear_bit(SAB82532_XPR, &up->irqflags); for (i = 0; i < up->port.fifosize; i++) { - writeb(xmit->buf[xmit->tail], - &up->regs->w.xfifo[i]); - uart_xmit_advance(&up->port, 1); - if (uart_circ_empty(xmit)) + unsigned char ch; + + if (!uart_fifo_get(&up->port, &ch)) break; + + writeb(ch, &up->regs->w.xfifo[i]); } /* Issue a Transmit Frame command. */ sunsab_cec_wait(up); writeb(SAB82532_CMDR_XF, &up->regs->w.cmdr); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(&up->port); - if (uart_circ_empty(xmit)) + if (kfifo_is_empty(&tport->xmit_fifo)) sunsab_stop_tx(&up->port); } @@ -435,10 +436,10 @@ static void sunsab_start_tx(struct uart_port *port) { struct uart_sunsab_port *up = container_of(port, struct uart_sunsab_port, port); - struct circ_buf *xmit = &up->port.state->xmit; + struct tty_port *tport = &up->port.state->port; int i; - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) + if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) return; up->interrupt_mask1 &= ~(SAB82532_IMR1_ALLS|SAB82532_IMR1_XPR); @@ -451,11 +452,12 @@ static void sunsab_start_tx(struct uart_port *port) clear_bit(SAB82532_XPR, &up->irqflags); for (i = 0; i < up->port.fifosize; i++) { - writeb(xmit->buf[xmit->tail], - &up->regs->w.xfifo[i]); - uart_xmit_advance(&up->port, 1); - if (uart_circ_empty(xmit)) + unsigned char ch; + + if (!uart_fifo_get(&up->port, &ch)) break; + + writeb(ch, &up->regs->w.xfifo[i]); } /* Issue a Transmit Frame command. */ diff --git a/drivers/tty/serial/sunsu.c b/drivers/tty/serial/sunsu.c index c8b65f4b27..67a5fc70bb 100644 --- a/drivers/tty/serial/sunsu.c +++ b/drivers/tty/serial/sunsu.c @@ -396,7 +396,8 @@ receive_chars(struct uart_sunsu_port *up, unsigned char *status) static void transmit_chars(struct uart_sunsu_port *up) { - struct circ_buf *xmit = &up->port.state->xmit; + struct tty_port *tport = &up->port.state->port; + unsigned char ch; int count; if (up->port.x_char) { @@ -409,23 +410,23 @@ static void transmit_chars(struct uart_sunsu_port *up) sunsu_stop_tx(&up->port); return; } - if (uart_circ_empty(xmit)) { + if (kfifo_is_empty(&tport->xmit_fifo)) { __stop_tx(up); return; } count = up->port.fifosize; do { - serial_out(up, UART_TX, xmit->buf[xmit->tail]); - uart_xmit_advance(&up->port, 1); - if (uart_circ_empty(xmit)) + if (!uart_fifo_get(&up->port, &ch)) break; + + serial_out(up, UART_TX, ch); } while (--count > 0); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(&up->port); - if (uart_circ_empty(xmit)) + if (kfifo_is_empty(&tport->xmit_fifo)) __stop_tx(up); } diff --git a/drivers/tty/serial/sunzilog.c b/drivers/tty/serial/sunzilog.c index c99289c6c8..71758ad424 100644 --- a/drivers/tty/serial/sunzilog.c +++ b/drivers/tty/serial/sunzilog.c @@ -453,7 +453,8 @@ static void sunzilog_status_handle(struct uart_sunzilog_port *up, static void sunzilog_transmit_chars(struct uart_sunzilog_port *up, struct zilog_channel __iomem *channel) { - struct circ_buf *xmit; + struct tty_port *tport; + unsigned char ch; if (ZS_IS_CONS(up)) { unsigned char status = readb(&channel->control); @@ -496,21 +497,20 @@ static void sunzilog_transmit_chars(struct uart_sunzilog_port *up, if (up->port.state == NULL) goto ack_tx_int; - xmit = &up->port.state->xmit; - if (uart_circ_empty(xmit)) - goto ack_tx_int; + tport = &up->port.state->port; if (uart_tx_stopped(&up->port)) goto ack_tx_int; + if (!uart_fifo_get(&up->port, &ch)) + goto ack_tx_int; + up->flags |= SUNZILOG_FLAG_TX_ACTIVE; - writeb(xmit->buf[xmit->tail], &channel->data); + writeb(ch, &channel->data); ZSDELAY(); ZS_WSYNC(channel); - uart_xmit_advance(&up->port, 1); - - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(&up->port); return; @@ -700,17 +700,16 @@ static void sunzilog_start_tx(struct uart_port *port) port->icount.tx++; port->x_char = 0; } else { - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; + unsigned char ch; - if (uart_circ_empty(xmit)) + if (!uart_fifo_get(&up->port, &ch)) return; - writeb(xmit->buf[xmit->tail], &channel->data); + writeb(ch, &channel->data); ZSDELAY(); ZS_WSYNC(channel); - uart_xmit_advance(port, 1); - - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(&up->port); } } diff --git a/drivers/tty/serial/tegra-tcu.c b/drivers/tty/serial/tegra-tcu.c index d9c78320eb..21ca5fcadf 100644 --- a/drivers/tty/serial/tegra-tcu.c +++ b/drivers/tty/serial/tegra-tcu.c @@ -91,15 +91,17 @@ static void tegra_tcu_write(struct tegra_tcu *tcu, const char *s, static void tegra_tcu_uart_start_tx(struct uart_port *port) { struct tegra_tcu *tcu = port->private_data; - struct circ_buf *xmit = &port->state->xmit; - unsigned long count; + struct tty_port *tport = &port->state->port; + unsigned char *tail; + unsigned int count; for (;;) { - count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); + count = kfifo_out_linear_ptr(&tport->xmit_fifo, &tail, + UART_XMIT_SIZE); if (!count) break; - tegra_tcu_write(tcu, &xmit->buf[xmit->tail], count); + tegra_tcu_write(tcu, tail, count); uart_xmit_advance(port, count); } diff --git a/drivers/tty/serial/timbuart.c b/drivers/tty/serial/timbuart.c index 4bc89a9b38..43fa0938b5 100644 --- a/drivers/tty/serial/timbuart.c +++ b/drivers/tty/serial/timbuart.c @@ -95,14 +95,11 @@ static void timbuart_rx_chars(struct uart_port *port) static void timbuart_tx_chars(struct uart_port *port) { - struct circ_buf *xmit = &port->state->xmit; + unsigned char ch; while (!(ioread32(port->membase + TIMBUART_ISR) & TXBF) && - !uart_circ_empty(xmit)) { - iowrite8(xmit->buf[xmit->tail], - port->membase + TIMBUART_TXFIFO); - uart_xmit_advance(port, 1); - } + uart_fifo_get(port, &ch)) + iowrite8(ch, port->membase + TIMBUART_TXFIFO); dev_dbg(port->dev, "%s - total written %d bytes, CTL: %x, RTS: %x, baud: %x\n", @@ -117,9 +114,9 @@ static void timbuart_handle_tx_port(struct uart_port *port, u32 isr, u32 *ier) { struct timbuart_port *uart = container_of(port, struct timbuart_port, port); - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) + if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) return; if (port->x_char) @@ -130,7 +127,7 @@ static void timbuart_handle_tx_port(struct uart_port *port, u32 isr, u32 *ier) /* clear all TX interrupts */ iowrite32(TXFLAGS, port->membase + TIMBUART_ISR); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); } else /* Re-enable any tx interrupt */ @@ -141,7 +138,7 @@ static void timbuart_handle_tx_port(struct uart_port *port, u32 isr, u32 *ier) * we wake up the upper layer later when we got the interrupt * to give it some time to go out... */ - if (!uart_circ_empty(xmit)) + if (!kfifo_is_empty(&tport->xmit_fifo)) *ier |= TXBAE; dev_dbg(port->dev, "%s - leaving\n", __func__); diff --git a/drivers/tty/serial/uartlite.c b/drivers/tty/serial/uartlite.c index 10ba41b7be..68357ac8ff 100644 --- a/drivers/tty/serial/uartlite.c +++ b/drivers/tty/serial/uartlite.c @@ -189,7 +189,8 @@ static int ulite_receive(struct uart_port *port, int stat) static int ulite_transmit(struct uart_port *port, int stat) { - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; + unsigned char ch; if (stat & ULITE_STATUS_TXFULL) return 0; @@ -201,14 +202,16 @@ static int ulite_transmit(struct uart_port *port, int stat) return 1; } - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) + if (uart_tx_stopped(port)) + return 0; + + if (!uart_fifo_get(port, &ch)) return 0; - uart_out32(xmit->buf[xmit->tail], ULITE_TX, port); - uart_xmit_advance(port, 1); + uart_out32(ch, ULITE_TX, port); /* wake up */ - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); return 1; diff --git a/drivers/tty/serial/ucc_uart.c b/drivers/tty/serial/ucc_uart.c index 397b95dff7..53bb8c5ef4 100644 --- a/drivers/tty/serial/ucc_uart.c +++ b/drivers/tty/serial/ucc_uart.c @@ -334,7 +334,7 @@ static int qe_uart_tx_pump(struct uart_qe_port *qe_port) unsigned char *p; unsigned int count; struct uart_port *port = &qe_port->port; - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; /* Handle xon/xoff */ if (port->x_char) { @@ -358,7 +358,7 @@ static int qe_uart_tx_pump(struct uart_qe_port *qe_port) return 1; } - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { + if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) { qe_uart_stop_tx(port); return 0; } @@ -366,16 +366,10 @@ static int qe_uart_tx_pump(struct uart_qe_port *qe_port) /* Pick next descriptor and fill from buffer */ bdp = qe_port->tx_cur; - while (!(ioread16be(&bdp->status) & BD_SC_READY) && !uart_circ_empty(xmit)) { - count = 0; + while (!(ioread16be(&bdp->status) & BD_SC_READY) && + !kfifo_is_empty(&tport->xmit_fifo)) { p = qe2cpu_addr(ioread32be(&bdp->buf), qe_port); - while (count < qe_port->tx_fifosize) { - *p++ = xmit->buf[xmit->tail]; - uart_xmit_advance(port, 1); - count++; - if (uart_circ_empty(xmit)) - break; - } + count = uart_fifo_out(port, p, qe_port->tx_fifosize); iowrite16be(count, &bdp->length); qe_setbits_be16(&bdp->status, BD_SC_READY); @@ -388,10 +382,10 @@ static int qe_uart_tx_pump(struct uart_qe_port *qe_port) } qe_port->tx_cur = bdp; - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); - if (uart_circ_empty(xmit)) { + if (kfifo_is_empty(&tport->xmit_fifo)) { /* The kernel buffer is empty, so turn off TX interrupts. We don't need to be told when the QE is finished transmitting the data. */ diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index 5f48ec37cb..2acfcea403 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -25,6 +25,7 @@ #include <linux/gpio.h> #include <linux/gpio/consumer.h> #include <linux/delay.h> +#include <linux/reset.h> #define CDNS_UART_TTY_NAME "ttyPS" #define CDNS_UART_NAME "xuartps" @@ -198,6 +199,7 @@ MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255"); * @gpiod_rts: Pointer to the gpio descriptor * @rs485_tx_started: RS485 tx state * @tx_timer: Timer for tx + * @rstc: Pointer to the reset control */ struct cdns_uart { struct uart_port *port; @@ -211,6 +213,7 @@ struct cdns_uart { struct gpio_desc *gpiod_rts; bool rs485_tx_started; struct hrtimer tx_timer; + struct reset_control *rstc; }; struct cdns_platform_data { u32 quirks; @@ -425,32 +428,32 @@ static void cdns_uart_handle_tx(void *dev_id) { struct uart_port *port = (struct uart_port *)dev_id; struct cdns_uart *cdns_uart = port->private_data; - struct circ_buf *xmit = &port->state->xmit; + struct tty_port *tport = &port->state->port; unsigned int numbytes; + unsigned char ch; - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { + if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) { /* Disable the TX Empty interrupt */ writel(CDNS_UART_IXR_TXEMPTY, port->membase + CDNS_UART_IDR); return; } numbytes = port->fifosize; - while (numbytes && !uart_circ_empty(xmit) && - !(readl(port->membase + CDNS_UART_SR) & CDNS_UART_SR_TXFULL)) { - - writel(xmit->buf[xmit->tail], port->membase + CDNS_UART_FIFO); - uart_xmit_advance(port, 1); + while (numbytes && + !(readl(port->membase + CDNS_UART_SR) & CDNS_UART_SR_TXFULL) && + uart_fifo_get(port, &ch)) { + writel(ch, port->membase + CDNS_UART_FIFO); numbytes--; } - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(port); /* Enable the TX Empty interrupt */ writel(CDNS_UART_IXR_TXEMPTY, cdns_uart->port->membase + CDNS_UART_IER); if (cdns_uart->port->rs485.flags & SER_RS485_ENABLED && - (uart_circ_empty(xmit) || uart_tx_stopped(port))) { + (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port))) { cdns_uart->tx_timer.function = &cdns_rs485_rx_callback; hrtimer_start(&cdns_uart->tx_timer, ns_to_ktime(cdns_calc_after_tx_delay(cdns_uart)), HRTIMER_MODE_REL); @@ -723,7 +726,7 @@ static void cdns_uart_start_tx(struct uart_port *port) status |= CDNS_UART_CR_TX_EN; writel(status, port->membase + CDNS_UART_CR); - if (uart_circ_empty(&port->state->xmit)) + if (kfifo_is_empty(&port->state->port.xmit_fifo)) return; /* Clear the TX Empty interrupt */ @@ -948,6 +951,10 @@ static int cdns_uart_startup(struct uart_port *port) is_brk_support = cdns_uart->quirks & CDNS_UART_RXBS_SUPPORT; + ret = reset_control_deassert(cdns_uart->rstc); + if (ret) + return ret; + uart_port_lock_irqsave(port, &flags); /* Disable the TX and RX */ @@ -1721,6 +1728,13 @@ static int cdns_uart_probe(struct platform_device *pdev) dev_err(&pdev->dev, "clock name 'ref_clk' is deprecated.\n"); } + cdns_uart_data->rstc = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL); + if (IS_ERR(cdns_uart_data->rstc)) { + rc = PTR_ERR(cdns_uart_data->rstc); + dev_err_probe(&pdev->dev, rc, "Cannot get UART reset\n"); + goto err_out_unregister_driver; + } + rc = clk_prepare_enable(cdns_uart_data->pclk); if (rc) { dev_err(&pdev->dev, "Unable to enable pclk clock.\n"); @@ -1881,6 +1895,7 @@ static void cdns_uart_remove(struct platform_device *pdev) if (console_port == port) console_port = NULL; #endif + reset_control_assert(cdns_uart_data->rstc); if (!--instances) uart_unregister_driver(cdns_uart_data->cdns_uart_driver); diff --git a/drivers/tty/serial/zs.c b/drivers/tty/serial/zs.c index 65ca4da6e3..79ea7108a0 100644 --- a/drivers/tty/serial/zs.c +++ b/drivers/tty/serial/zs.c @@ -606,7 +606,8 @@ static void zs_receive_chars(struct zs_port *zport) static void zs_raw_transmit_chars(struct zs_port *zport) { - struct circ_buf *xmit = &zport->port.state->xmit; + struct tty_port *tport = &zport->port.state->port; + unsigned char ch; /* XON/XOFF chars. */ if (zport->port.x_char) { @@ -617,20 +618,20 @@ static void zs_raw_transmit_chars(struct zs_port *zport) } /* If nothing to do or stopped or hardware stopped. */ - if (uart_circ_empty(xmit) || uart_tx_stopped(&zport->port)) { + if (uart_tx_stopped(&zport->port) || + !uart_fifo_get(&zport->port, &ch)) { zs_raw_stop_tx(zport); return; } /* Send char. */ - write_zsdata(zport, xmit->buf[xmit->tail]); - uart_xmit_advance(&zport->port, 1); + write_zsdata(zport, ch); - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS) uart_write_wakeup(&zport->port); /* Are we are done? */ - if (uart_circ_empty(xmit)) + if (kfifo_is_empty(&tport->xmit_fifo)) zs_raw_stop_tx(zport); } |