diff options
Diffstat (limited to 'drivers/tty/serial/atmel_serial.c')
| -rw-r--r-- | drivers/tty/serial/atmel_serial.c | 3054 |
1 files changed, 3054 insertions, 0 deletions
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c new file mode 100644 index 0000000000..88cdafa5ac --- /dev/null +++ b/drivers/tty/serial/atmel_serial.c @@ -0,0 +1,3054 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Driver for Atmel AT91 Serial ports + * Copyright (C) 2003 Rick Bronson + * + * Based on drivers/char/serial_sa1100.c, by Deep Blue Solutions Ltd. + * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. + * + * DMA support added by Chip Coldwell. + */ +#include <linux/circ_buf.h> +#include <linux/tty.h> +#include <linux/ioport.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/serial.h> +#include <linux/clk.h> +#include <linux/clk-provider.h> +#include <linux/console.h> +#include <linux/sysrq.h> +#include <linux/tty_flip.h> +#include <linux/platform_device.h> +#include <linux/of.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/atmel_pdc.h> +#include <linux/uaccess.h> +#include <linux/platform_data/atmel.h> +#include <linux/timer.h> +#include <linux/err.h> +#include <linux/irq.h> +#include <linux/suspend.h> +#include <linux/mm.h> +#include <linux/io.h> + +#include <asm/div64.h> +#include <asm/ioctls.h> + +#define PDC_BUFFER_SIZE 512 +/* Revisit: We should calculate this based on the actual port settings */ +#define PDC_RX_TIMEOUT (3 * 10) /* 3 bytes */ + +/* The minium number of data FIFOs should be able to contain */ +#define ATMEL_MIN_FIFO_SIZE 8 +/* + * These two offsets are substracted from the RX FIFO size to define the RTS + * high and low thresholds + */ +#define ATMEL_RTS_HIGH_OFFSET 16 +#define ATMEL_RTS_LOW_OFFSET 20 + +#include <linux/serial_core.h> + +#include "serial_mctrl_gpio.h" +#include "atmel_serial.h" + +static void atmel_start_rx(struct uart_port *port); +static void atmel_stop_rx(struct uart_port *port); + +#ifdef CONFIG_SERIAL_ATMEL_TTYAT + +/* Use device name ttyAT, major 204 and minor 154-169. This is necessary if we + * should coexist with the 8250 driver, such as if we have an external 16C550 + * UART. */ +#define SERIAL_ATMEL_MAJOR 204 +#define MINOR_START 154 +#define ATMEL_DEVICENAME "ttyAT" + +#else + +/* Use device name ttyS, major 4, minor 64-68. This is the usual serial port + * name, but it is legally reserved for the 8250 driver. */ +#define SERIAL_ATMEL_MAJOR TTY_MAJOR +#define MINOR_START 64 +#define ATMEL_DEVICENAME "ttyS" + +#endif + +#define ATMEL_ISR_PASS_LIMIT 256 + +struct atmel_dma_buffer { + unsigned char *buf; + dma_addr_t dma_addr; + unsigned int dma_size; + unsigned int ofs; +}; + +struct atmel_uart_char { + u16 status; + u16 ch; +}; + +/* + * Be careful, the real size of the ring buffer is + * sizeof(atmel_uart_char) * ATMEL_SERIAL_RINGSIZE. It means that ring buffer + * can contain up to 1024 characters in PIO mode and up to 4096 characters in + * DMA mode. + */ +#define ATMEL_SERIAL_RINGSIZE 1024 + +/* + * at91: 6 USARTs and one DBGU port (SAM9260) + * samx7: 3 USARTs and 5 UARTs + */ +#define ATMEL_MAX_UART 8 + +/* + * We wrap our port structure around the generic uart_port. + */ +struct atmel_uart_port { + struct uart_port uart; /* uart */ + struct clk *clk; /* uart clock */ + struct clk *gclk; /* uart generic clock */ + int may_wakeup; /* cached value of device_may_wakeup for times we need to disable it */ + u32 backup_imr; /* IMR saved during suspend */ + int break_active; /* break being received */ + + bool use_dma_rx; /* enable DMA receiver */ + bool use_pdc_rx; /* enable PDC receiver */ + short pdc_rx_idx; /* current PDC RX buffer */ + struct atmel_dma_buffer pdc_rx[2]; /* PDC receier */ + + bool use_dma_tx; /* enable DMA transmitter */ + bool use_pdc_tx; /* enable PDC transmitter */ + struct atmel_dma_buffer pdc_tx; /* PDC transmitter */ + + spinlock_t lock_tx; /* port lock */ + spinlock_t lock_rx; /* port lock */ + struct dma_chan *chan_tx; + struct dma_chan *chan_rx; + struct dma_async_tx_descriptor *desc_tx; + 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; + struct tasklet_struct tasklet_rx; + struct tasklet_struct tasklet_tx; + atomic_t tasklet_shutdown; + unsigned int irq_status_prev; + unsigned int tx_len; + + struct circ_buf rx_ring; + + struct mctrl_gpios *gpios; + u32 backup_mode; /* MR saved during iso7816 operations */ + u32 backup_brgr; /* BRGR saved during iso7816 operations */ + unsigned int tx_done_mask; + u32 fifo_size; + u32 rts_high; + u32 rts_low; + bool ms_irq_enabled; + u32 rtor; /* address of receiver timeout register if it exists */ + bool is_usart; + bool has_frac_baudrate; + bool has_hw_timer; + struct timer_list uart_timer; + + bool tx_stopped; + bool suspended; + unsigned int pending; + unsigned int pending_status; + spinlock_t lock_suspended; + + bool hd_start_rx; /* can start RX during half-duplex operation */ + + /* ISO7816 */ + unsigned int fidi_min; + unsigned int fidi_max; + + struct { + u32 cr; + u32 mr; + u32 imr; + u32 brgr; + u32 rtor; + u32 ttgr; + u32 fmr; + u32 fimr; + } cache; + + int (*prepare_rx)(struct uart_port *port); + int (*prepare_tx)(struct uart_port *port); + void (*schedule_rx)(struct uart_port *port); + void (*schedule_tx)(struct uart_port *port); + void (*release_rx)(struct uart_port *port); + void (*release_tx)(struct uart_port *port); +}; + +static struct atmel_uart_port atmel_ports[ATMEL_MAX_UART]; +static DECLARE_BITMAP(atmel_ports_in_use, ATMEL_MAX_UART); + +#if defined(CONFIG_OF) +static const struct of_device_id atmel_serial_dt_ids[] = { + { .compatible = "atmel,at91rm9200-usart-serial" }, + { /* sentinel */ } +}; +#endif + +static inline struct atmel_uart_port * +to_atmel_uart_port(struct uart_port *uart) +{ + return container_of(uart, struct atmel_uart_port, uart); +} + +static inline u32 atmel_uart_readl(struct uart_port *port, u32 reg) +{ + return __raw_readl(port->membase + reg); +} + +static inline void atmel_uart_writel(struct uart_port *port, u32 reg, u32 value) +{ + __raw_writel(value, port->membase + reg); +} + +static inline u8 atmel_uart_read_char(struct uart_port *port) +{ + return __raw_readb(port->membase + ATMEL_US_RHR); +} + +static inline void atmel_uart_write_char(struct uart_port *port, u8 value) +{ + __raw_writeb(value, port->membase + ATMEL_US_THR); +} + +static inline int atmel_uart_is_half_duplex(struct uart_port *port) +{ + return ((port->rs485.flags & SER_RS485_ENABLED) && + !(port->rs485.flags & SER_RS485_RX_DURING_TX)) || + (port->iso7816.flags & SER_ISO7816_ENABLED); +} + +static inline int atmel_error_rate(int desired_value, int actual_value) +{ + return 100 - (desired_value * 100) / actual_value; +} + +#ifdef CONFIG_SERIAL_ATMEL_PDC +static bool atmel_use_pdc_rx(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + + return atmel_port->use_pdc_rx; +} + +static bool atmel_use_pdc_tx(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + + return atmel_port->use_pdc_tx; +} +#else +static bool atmel_use_pdc_rx(struct uart_port *port) +{ + return false; +} + +static bool atmel_use_pdc_tx(struct uart_port *port) +{ + return false; +} +#endif + +static bool atmel_use_dma_tx(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + + return atmel_port->use_dma_tx; +} + +static bool atmel_use_dma_rx(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + + return atmel_port->use_dma_rx; +} + +static bool atmel_use_fifo(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + + return atmel_port->fifo_size; +} + +static void atmel_tasklet_schedule(struct atmel_uart_port *atmel_port, + struct tasklet_struct *t) +{ + if (!atomic_read(&atmel_port->tasklet_shutdown)) + tasklet_schedule(t); +} + +/* Enable or disable the rs485 support */ +static int atmel_config_rs485(struct uart_port *port, struct ktermios *termios, + struct serial_rs485 *rs485conf) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + unsigned int mode; + + /* Disable interrupts */ + atmel_uart_writel(port, ATMEL_US_IDR, atmel_port->tx_done_mask); + + mode = atmel_uart_readl(port, ATMEL_US_MR); + + if (rs485conf->flags & SER_RS485_ENABLED) { + dev_dbg(port->dev, "Setting UART to RS485\n"); + if (rs485conf->flags & SER_RS485_RX_DURING_TX) + atmel_port->tx_done_mask = ATMEL_US_TXRDY; + else + atmel_port->tx_done_mask = ATMEL_US_TXEMPTY; + + atmel_uart_writel(port, ATMEL_US_TTGR, + rs485conf->delay_rts_after_send); + mode &= ~ATMEL_US_USMODE; + mode |= ATMEL_US_USMODE_RS485; + } else { + dev_dbg(port->dev, "Setting UART to RS232\n"); + if (atmel_use_pdc_tx(port)) + atmel_port->tx_done_mask = ATMEL_US_ENDTX | + ATMEL_US_TXBUFE; + else + atmel_port->tx_done_mask = ATMEL_US_TXRDY; + } + atmel_uart_writel(port, ATMEL_US_MR, mode); + + /* Enable interrupts */ + atmel_uart_writel(port, ATMEL_US_IER, atmel_port->tx_done_mask); + + return 0; +} + +static unsigned int atmel_calc_cd(struct uart_port *port, + struct serial_iso7816 *iso7816conf) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + unsigned int cd; + u64 mck_rate; + + mck_rate = (u64)clk_get_rate(atmel_port->clk); + do_div(mck_rate, iso7816conf->clk); + cd = mck_rate; + return cd; +} + +static unsigned int atmel_calc_fidi(struct uart_port *port, + struct serial_iso7816 *iso7816conf) +{ + u64 fidi = 0; + + if (iso7816conf->sc_fi && iso7816conf->sc_di) { + fidi = (u64)iso7816conf->sc_fi; + do_div(fidi, iso7816conf->sc_di); + } + return (u32)fidi; +} + +/* Enable or disable the iso7816 support */ +/* Called with interrupts disabled */ +static int atmel_config_iso7816(struct uart_port *port, + struct serial_iso7816 *iso7816conf) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + unsigned int mode; + unsigned int cd, fidi; + int ret = 0; + + /* Disable interrupts */ + atmel_uart_writel(port, ATMEL_US_IDR, atmel_port->tx_done_mask); + + mode = atmel_uart_readl(port, ATMEL_US_MR); + + if (iso7816conf->flags & SER_ISO7816_ENABLED) { + mode &= ~ATMEL_US_USMODE; + + if (iso7816conf->tg > 255) { + dev_err(port->dev, "ISO7816: Timeguard exceeding 255\n"); + memset(iso7816conf, 0, sizeof(struct serial_iso7816)); + ret = -EINVAL; + goto err_out; + } + + if ((iso7816conf->flags & SER_ISO7816_T_PARAM) + == SER_ISO7816_T(0)) { + mode |= ATMEL_US_USMODE_ISO7816_T0 | ATMEL_US_DSNACK; + } else if ((iso7816conf->flags & SER_ISO7816_T_PARAM) + == SER_ISO7816_T(1)) { + mode |= ATMEL_US_USMODE_ISO7816_T1 | ATMEL_US_INACK; + } else { + dev_err(port->dev, "ISO7816: Type not supported\n"); + memset(iso7816conf, 0, sizeof(struct serial_iso7816)); + ret = -EINVAL; + goto err_out; + } + + mode &= ~(ATMEL_US_USCLKS | ATMEL_US_NBSTOP | ATMEL_US_PAR); + + /* select mck clock, and output */ + mode |= ATMEL_US_USCLKS_MCK | ATMEL_US_CLKO; + /* set parity for normal/inverse mode + max iterations */ + mode |= ATMEL_US_PAR_EVEN | ATMEL_US_NBSTOP_1 | ATMEL_US_MAX_ITER(3); + + cd = atmel_calc_cd(port, iso7816conf); + fidi = atmel_calc_fidi(port, iso7816conf); + if (fidi == 0) { + dev_warn(port->dev, "ISO7816 fidi = 0, Generator generates no signal\n"); + } else if (fidi < atmel_port->fidi_min + || fidi > atmel_port->fidi_max) { + dev_err(port->dev, "ISO7816 fidi = %u, value not supported\n", fidi); + memset(iso7816conf, 0, sizeof(struct serial_iso7816)); + ret = -EINVAL; + goto err_out; + } + + if (!(port->iso7816.flags & SER_ISO7816_ENABLED)) { + /* port not yet in iso7816 mode: store configuration */ + atmel_port->backup_mode = atmel_uart_readl(port, ATMEL_US_MR); + atmel_port->backup_brgr = atmel_uart_readl(port, ATMEL_US_BRGR); + } + + atmel_uart_writel(port, ATMEL_US_TTGR, iso7816conf->tg); + atmel_uart_writel(port, ATMEL_US_BRGR, cd); + atmel_uart_writel(port, ATMEL_US_FIDI, fidi); + + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXDIS | ATMEL_US_RXEN); + atmel_port->tx_done_mask = ATMEL_US_TXEMPTY | ATMEL_US_NACK | ATMEL_US_ITERATION; + } else { + dev_dbg(port->dev, "Setting UART back to RS232\n"); + /* back to last RS232 settings */ + mode = atmel_port->backup_mode; + memset(iso7816conf, 0, sizeof(struct serial_iso7816)); + atmel_uart_writel(port, ATMEL_US_TTGR, 0); + atmel_uart_writel(port, ATMEL_US_BRGR, atmel_port->backup_brgr); + atmel_uart_writel(port, ATMEL_US_FIDI, 0x174); + + if (atmel_use_pdc_tx(port)) + atmel_port->tx_done_mask = ATMEL_US_ENDTX | + ATMEL_US_TXBUFE; + else + atmel_port->tx_done_mask = ATMEL_US_TXRDY; + } + + port->iso7816 = *iso7816conf; + + atmel_uart_writel(port, ATMEL_US_MR, mode); + +err_out: + /* Enable interrupts */ + atmel_uart_writel(port, ATMEL_US_IER, atmel_port->tx_done_mask); + + return ret; +} + +/* + * Return TIOCSER_TEMT when transmitter FIFO and Shift register is empty. + */ +static u_int atmel_tx_empty(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + + if (atmel_port->tx_stopped) + return TIOCSER_TEMT; + return (atmel_uart_readl(port, ATMEL_US_CSR) & ATMEL_US_TXEMPTY) ? + TIOCSER_TEMT : + 0; +} + +/* + * Set state of the modem control output lines + */ +static void atmel_set_mctrl(struct uart_port *port, u_int mctrl) +{ + unsigned int control = 0; + unsigned int mode = atmel_uart_readl(port, ATMEL_US_MR); + unsigned int rts_paused, rts_ready; + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + + /* override mode to RS485 if needed, otherwise keep the current mode */ + if (port->rs485.flags & SER_RS485_ENABLED) { + atmel_uart_writel(port, ATMEL_US_TTGR, + port->rs485.delay_rts_after_send); + mode &= ~ATMEL_US_USMODE; + mode |= ATMEL_US_USMODE_RS485; + } + + /* set the RTS line state according to the mode */ + if ((mode & ATMEL_US_USMODE) == ATMEL_US_USMODE_HWHS) { + /* force RTS line to high level */ + rts_paused = ATMEL_US_RTSEN; + + /* give the control of the RTS line back to the hardware */ + rts_ready = ATMEL_US_RTSDIS; + } else { + /* force RTS line to high level */ + rts_paused = ATMEL_US_RTSDIS; + + /* force RTS line to low level */ + rts_ready = ATMEL_US_RTSEN; + } + + if (mctrl & TIOCM_RTS) + control |= rts_ready; + else + control |= rts_paused; + + if (mctrl & TIOCM_DTR) + control |= ATMEL_US_DTREN; + else + control |= ATMEL_US_DTRDIS; + + atmel_uart_writel(port, ATMEL_US_CR, control); + + mctrl_gpio_set(atmel_port->gpios, mctrl); + + /* Local loopback mode? */ + mode &= ~ATMEL_US_CHMODE; + if (mctrl & TIOCM_LOOP) + mode |= ATMEL_US_CHMODE_LOC_LOOP; + else + mode |= ATMEL_US_CHMODE_NORMAL; + + atmel_uart_writel(port, ATMEL_US_MR, mode); +} + +/* + * Get state of the modem control input lines + */ +static u_int atmel_get_mctrl(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + unsigned int ret = 0, status; + + status = atmel_uart_readl(port, ATMEL_US_CSR); + + /* + * The control signals are active low. + */ + if (!(status & ATMEL_US_DCD)) + ret |= TIOCM_CD; + if (!(status & ATMEL_US_CTS)) + ret |= TIOCM_CTS; + if (!(status & ATMEL_US_DSR)) + ret |= TIOCM_DSR; + if (!(status & ATMEL_US_RI)) + ret |= TIOCM_RI; + + return mctrl_gpio_get(atmel_port->gpios, &ret); +} + +/* + * Stop transmitting. + */ +static void atmel_stop_tx(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + bool is_pdc = atmel_use_pdc_tx(port); + bool is_dma = is_pdc || atmel_use_dma_tx(port); + + if (is_pdc) { + /* disable PDC transmit */ + atmel_uart_writel(port, ATMEL_PDC_PTCR, ATMEL_PDC_TXTDIS); + } + + if (is_dma) { + /* + * Disable the transmitter. + * This is mandatory when DMA is used, otherwise the DMA buffer + * is fully transmitted. + */ + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXDIS); + atmel_port->tx_stopped = true; + } + + /* Disable interrupts */ + atmel_uart_writel(port, ATMEL_US_IDR, atmel_port->tx_done_mask); + + if (atmel_uart_is_half_duplex(port)) + if (!atomic_read(&atmel_port->tasklet_shutdown)) + atmel_start_rx(port); +} + +/* + * Start transmitting. + */ +static void atmel_start_tx(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + bool is_pdc = atmel_use_pdc_tx(port); + bool is_dma = is_pdc || atmel_use_dma_tx(port); + + if (is_pdc && (atmel_uart_readl(port, ATMEL_PDC_PTSR) + & ATMEL_PDC_TXTEN)) + /* The transmitter is already running. Yes, we + really need this.*/ + return; + + if (is_dma && atmel_uart_is_half_duplex(port)) + atmel_stop_rx(port); + + if (is_pdc) { + /* re-enable PDC transmit */ + atmel_uart_writel(port, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN); + } + + /* Enable interrupts */ + atmel_uart_writel(port, ATMEL_US_IER, atmel_port->tx_done_mask); + + if (is_dma) { + /* re-enable the transmitter */ + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXEN); + atmel_port->tx_stopped = false; + } +} + +/* + * start receiving - port is in process of being opened. + */ +static void atmel_start_rx(struct uart_port *port) +{ + /* reset status and receiver */ + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_RSTSTA); + + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_RXEN); + + if (atmel_use_pdc_rx(port)) { + /* enable PDC controller */ + atmel_uart_writel(port, ATMEL_US_IER, + ATMEL_US_ENDRX | ATMEL_US_TIMEOUT | + port->read_status_mask); + atmel_uart_writel(port, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN); + } else { + atmel_uart_writel(port, ATMEL_US_IER, ATMEL_US_RXRDY); + } +} + +/* + * Stop receiving - port is in process of being closed. + */ +static void atmel_stop_rx(struct uart_port *port) +{ + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_RXDIS); + + if (atmel_use_pdc_rx(port)) { + /* disable PDC receive */ + atmel_uart_writel(port, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS); + atmel_uart_writel(port, ATMEL_US_IDR, + ATMEL_US_ENDRX | ATMEL_US_TIMEOUT | + port->read_status_mask); + } else { + atmel_uart_writel(port, ATMEL_US_IDR, ATMEL_US_RXRDY); + } +} + +/* + * Enable modem status interrupts + */ +static void atmel_enable_ms(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + uint32_t ier = 0; + + /* + * Interrupt should not be enabled twice + */ + if (atmel_port->ms_irq_enabled) + return; + + atmel_port->ms_irq_enabled = true; + + if (!mctrl_gpio_to_gpiod(atmel_port->gpios, UART_GPIO_CTS)) + ier |= ATMEL_US_CTSIC; + + if (!mctrl_gpio_to_gpiod(atmel_port->gpios, UART_GPIO_DSR)) + ier |= ATMEL_US_DSRIC; + + if (!mctrl_gpio_to_gpiod(atmel_port->gpios, UART_GPIO_RI)) + ier |= ATMEL_US_RIIC; + + if (!mctrl_gpio_to_gpiod(atmel_port->gpios, UART_GPIO_DCD)) + ier |= ATMEL_US_DCDIC; + + atmel_uart_writel(port, ATMEL_US_IER, ier); + + mctrl_gpio_enable_ms(atmel_port->gpios); +} + +/* + * Disable modem status interrupts + */ +static void atmel_disable_ms(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + uint32_t idr = 0; + + /* + * Interrupt should not be disabled twice + */ + if (!atmel_port->ms_irq_enabled) + return; + + atmel_port->ms_irq_enabled = false; + + mctrl_gpio_disable_ms(atmel_port->gpios); + + if (!mctrl_gpio_to_gpiod(atmel_port->gpios, UART_GPIO_CTS)) + idr |= ATMEL_US_CTSIC; + + if (!mctrl_gpio_to_gpiod(atmel_port->gpios, UART_GPIO_DSR)) + idr |= ATMEL_US_DSRIC; + + if (!mctrl_gpio_to_gpiod(atmel_port->gpios, UART_GPIO_RI)) + idr |= ATMEL_US_RIIC; + + if (!mctrl_gpio_to_gpiod(atmel_port->gpios, UART_GPIO_DCD)) + idr |= ATMEL_US_DCDIC; + + atmel_uart_writel(port, ATMEL_US_IDR, idr); +} + +/* + * Control the transmission of a break signal + */ +static void atmel_break_ctl(struct uart_port *port, int break_state) +{ + if (break_state != 0) + /* start break */ + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_STTBRK); + else + /* stop break */ + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_STPBRK); +} + +/* + * Stores the incoming character in the ring buffer + */ +static void +atmel_buffer_rx_char(struct uart_port *port, unsigned int status, + unsigned int ch) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + struct circ_buf *ring = &atmel_port->rx_ring; + struct atmel_uart_char *c; + + if (!CIRC_SPACE(ring->head, ring->tail, ATMEL_SERIAL_RINGSIZE)) + /* Buffer overflow, ignore char */ + return; + + c = &((struct atmel_uart_char *)ring->buf)[ring->head]; + c->status = status; + c->ch = ch; + + /* Make sure the character is stored before we update head. */ + smp_wmb(); + + ring->head = (ring->head + 1) & (ATMEL_SERIAL_RINGSIZE - 1); +} + +/* + * Deal with parity, framing and overrun errors. + */ +static void atmel_pdc_rxerr(struct uart_port *port, unsigned int status) +{ + /* clear error */ + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_RSTSTA); + + if (status & ATMEL_US_RXBRK) { + /* ignore side-effect */ + status &= ~(ATMEL_US_PARE | ATMEL_US_FRAME); + port->icount.brk++; + } + if (status & ATMEL_US_PARE) + port->icount.parity++; + if (status & ATMEL_US_FRAME) + port->icount.frame++; + if (status & ATMEL_US_OVRE) + port->icount.overrun++; +} + +/* + * Characters received (called from interrupt handler) + */ +static void atmel_rx_chars(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + unsigned int status, ch; + + status = atmel_uart_readl(port, ATMEL_US_CSR); + while (status & ATMEL_US_RXRDY) { + ch = atmel_uart_read_char(port); + + /* + * note that the error handling code is + * out of the main execution path + */ + if (unlikely(status & (ATMEL_US_PARE | ATMEL_US_FRAME + | ATMEL_US_OVRE | ATMEL_US_RXBRK) + || atmel_port->break_active)) { + + /* clear error */ + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_RSTSTA); + + if (status & ATMEL_US_RXBRK + && !atmel_port->break_active) { + atmel_port->break_active = 1; + atmel_uart_writel(port, ATMEL_US_IER, + ATMEL_US_RXBRK); + } else { + /* + * This is either the end-of-break + * condition or we've received at + * least one character without RXBRK + * being set. In both cases, the next + * RXBRK will indicate start-of-break. + */ + atmel_uart_writel(port, ATMEL_US_IDR, + ATMEL_US_RXBRK); + status &= ~ATMEL_US_RXBRK; + atmel_port->break_active = 0; + } + } + + atmel_buffer_rx_char(port, status, ch); + status = atmel_uart_readl(port, ATMEL_US_CSR); + } + + atmel_tasklet_schedule(atmel_port, &atmel_port->tasklet_rx); +} + +/* + * Transmit characters (called from tasklet with TXRDY interrupt + * disabled) + */ +static void atmel_tx_chars(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + bool pending; + u8 ch; + + pending = uart_port_tx(port, ch, + atmel_uart_readl(port, ATMEL_US_CSR) & ATMEL_US_TXRDY, + atmel_uart_write_char(port, ch)); + if (pending) { + /* we still have characters to transmit, so we should continue + * transmitting them when TX is ready, regardless of + * mode or duplexity + */ + atmel_port->tx_done_mask |= ATMEL_US_TXRDY; + + /* Enable interrupts */ + atmel_uart_writel(port, ATMEL_US_IER, + atmel_port->tx_done_mask); + } else { + if (atmel_uart_is_half_duplex(port)) + atmel_port->tx_done_mask &= ~ATMEL_US_TXRDY; + } +} + +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 dma_chan *chan = atmel_port->chan_tx; + unsigned long flags; + + spin_lock_irqsave(&port->lock, flags); + + if (chan) + dmaengine_terminate_all(chan); + uart_xmit_advance(port, atmel_port->tx_len); + + spin_lock(&atmel_port->lock_tx); + async_tx_ack(atmel_port->desc_tx); + atmel_port->cookie_tx = -EINVAL; + atmel_port->desc_tx = NULL; + spin_unlock(&atmel_port->lock_tx); + + if (uart_circ_chars_pending(xmit) < 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. + */ + if (!uart_circ_empty(xmit)) + atmel_tasklet_schedule(atmel_port, &atmel_port->tasklet_tx); + else if (atmel_uart_is_half_duplex(port)) { + /* + * DMA done, re-enable TXEMPTY and signal that we can stop + * TX and start RX for RS485 + */ + atmel_port->hd_start_rx = true; + atmel_uart_writel(port, ATMEL_US_IER, + atmel_port->tx_done_mask); + } + + spin_unlock_irqrestore(&port->lock, flags); +} + +static void atmel_release_tx_dma(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + struct dma_chan *chan = atmel_port->chan_tx; + + if (chan) { + dmaengine_terminate_all(chan); + dma_release_channel(chan); + dma_unmap_sg(port->dev, &atmel_port->sg_tx, 1, + DMA_TO_DEVICE); + } + + atmel_port->desc_tx = NULL; + atmel_port->chan_tx = NULL; + atmel_port->cookie_tx = -EINVAL; +} + +/* + * Called from tasklet with TXRDY interrupt is disabled. + */ +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 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; + 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)) { + /* + * DMA is idle now. + * Port xmit buffer is already mapped, + * and it is one page... Just adjust + * offsets and lengths. Since it is a circular buffer, + * we have to transmit till the end, and then the rest. + * Take the port lock to get a + * consistent xmit buffer state. + */ + tx_len = CIRC_CNT_TO_END(xmit->head, + xmit->tail, + UART_XMIT_SIZE); + + if (atmel_port->fifo_size) { + /* multi data mode */ + part1_len = (tx_len & ~0x3); /* DWORD access */ + part2_len = (tx_len & 0x3); /* BYTE access */ + } else { + /* single data (legacy) mode */ + part1_len = 0; + part2_len = tx_len; /* BYTE access only */ + } + + sg_init_table(sgl, 2); + sg_len = 0; + phys_addr = sg_dma_address(sg_tx) + xmit->tail; + if (part1_len) { + sg = &sgl[sg_len++]; + sg_dma_address(sg) = phys_addr; + sg_dma_len(sg) = part1_len; + + phys_addr += part1_len; + } + + if (part2_len) { + sg = &sgl[sg_len++]; + sg_dma_address(sg) = phys_addr; + sg_dma_len(sg) = part2_len; + } + + /* + * save tx_len so atmel_complete_tx_dma() will increase + * xmit->tail correctly + */ + atmel_port->tx_len = tx_len; + + desc = dmaengine_prep_slave_sg(chan, + sgl, + sg_len, + DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | + DMA_CTRL_ACK); + if (!desc) { + dev_err(port->dev, "Failed to send via dma!\n"); + return; + } + + dma_sync_sg_for_device(port->dev, sg_tx, 1, DMA_TO_DEVICE); + + atmel_port->desc_tx = desc; + desc->callback = atmel_complete_tx_dma; + desc->callback_param = atmel_port; + atmel_port->cookie_tx = dmaengine_submit(desc); + if (dma_submit_error(atmel_port->cookie_tx)) { + dev_err(port->dev, "dma_submit_error %d\n", + atmel_port->cookie_tx); + return; + } + + dma_async_issue_pending(chan); + } + + if (uart_circ_chars_pending(xmit) < 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 device *mfd_dev = port->dev->parent; + dma_cap_mask_t mask; + struct dma_slave_config config; + int ret, nent; + + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + + atmel_port->chan_tx = dma_request_slave_channel(mfd_dev, "tx"); + if (atmel_port->chan_tx == NULL) + goto chan_err; + dev_info(port->dev, "using %s for tx DMA transfers\n", + 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) { + 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)); + } + + /* Configure the slave DMA */ + memset(&config, 0, sizeof(config)); + config.direction = DMA_MEM_TO_DEV; + config.dst_addr_width = (atmel_port->fifo_size) ? + DMA_SLAVE_BUSWIDTH_4_BYTES : + DMA_SLAVE_BUSWIDTH_1_BYTE; + config.dst_addr = port->mapbase + ATMEL_US_THR; + config.dst_maxburst = 1; + + ret = dmaengine_slave_config(atmel_port->chan_tx, + &config); + if (ret) { + dev_err(port->dev, "DMA tx slave configuration failed\n"); + goto chan_err; + } + + return 0; + +chan_err: + dev_err(port->dev, "TX channel not available, switch to pio\n"); + atmel_port->use_dma_tx = false; + if (atmel_port->chan_tx) + atmel_release_tx_dma(port); + return -EINVAL; +} + +static void atmel_complete_rx_dma(void *arg) +{ + struct uart_port *port = arg; + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + + atmel_tasklet_schedule(atmel_port, &atmel_port->tasklet_rx); +} + +static void atmel_release_rx_dma(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + struct dma_chan *chan = atmel_port->chan_rx; + + if (chan) { + dmaengine_terminate_all(chan); + dma_release_channel(chan); + dma_unmap_sg(port->dev, &atmel_port->sg_rx, 1, + DMA_FROM_DEVICE); + } + + atmel_port->desc_rx = NULL; + atmel_port->chan_rx = NULL; + atmel_port->cookie_rx = -EINVAL; +} + +static void atmel_rx_from_dma(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + struct tty_port *tport = &port->state->port; + struct circ_buf *ring = &atmel_port->rx_ring; + struct dma_chan *chan = atmel_port->chan_rx; + struct dma_tx_state state; + enum dma_status dmastat; + size_t count; + + + /* Reset the UART timeout early so that we don't miss one */ + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_STTTO); + dmastat = dmaengine_tx_status(chan, + atmel_port->cookie_rx, + &state); + /* Restart a new tasklet if DMA status is error */ + if (dmastat == DMA_ERROR) { + dev_dbg(port->dev, "Get residue error, restart tasklet\n"); + atmel_uart_writel(port, ATMEL_US_IER, ATMEL_US_TIMEOUT); + atmel_tasklet_schedule(atmel_port, &atmel_port->tasklet_rx); + return; + } + + /* CPU claims ownership of RX DMA buffer */ + dma_sync_sg_for_cpu(port->dev, + &atmel_port->sg_rx, + 1, + DMA_FROM_DEVICE); + + /* + * ring->head points to the end of data already written by the DMA. + * ring->tail points to the beginning of data to be read by the + * framework. + * 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)); + /* + * At this point ring->head may point to the first byte right after the + * last byte of the dma buffer: + * 0 <= ring->head <= sg_dma_len(&atmel_port->sg_rx) + * + * However ring->tail must always points inside the dma buffer: + * 0 <= ring->tail <= sg_dma_len(&atmel_port->sg_rx) - 1 + * + * Since we use a ring buffer, we have to handle the case + * where head is lower than tail. In such a case, we first read from + * 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; + + tty_insert_flip_string(tport, ring->buf + ring->tail, count); + ring->tail = 0; + port->icount.rx += count; + } + + /* Finally we read data from tail to head */ + if (ring->tail < ring->head) { + count = ring->head - ring->tail; + + 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)) + 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); + + tty_flip_buffer_push(tport); + + atmel_uart_writel(port, ATMEL_US_IER, ATMEL_US_TIMEOUT); +} + +static int atmel_prepare_rx_dma(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + struct device *mfd_dev = port->dev->parent; + struct dma_async_tx_descriptor *desc; + dma_cap_mask_t mask; + struct dma_slave_config config; + struct circ_buf *ring; + int ret, nent; + + ring = &atmel_port->rx_ring; + + dma_cap_zero(mask); + dma_cap_set(DMA_CYCLIC, mask); + + atmel_port->chan_rx = dma_request_slave_channel(mfd_dev, "rx"); + if (atmel_port->chan_rx == NULL) + goto chan_err; + dev_info(port->dev, "using %s for rx DMA transfers\n", + 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) { + 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)); + } + + /* Configure the slave DMA */ + memset(&config, 0, sizeof(config)); + config.direction = DMA_DEV_TO_MEM; + config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; + config.src_addr = port->mapbase + ATMEL_US_RHR; + config.src_maxburst = 1; + + ret = dmaengine_slave_config(atmel_port->chan_rx, + &config); + if (ret) { + dev_err(port->dev, "DMA rx slave configuration failed\n"); + goto chan_err; + } + /* + * Prepare a cyclic dma transfer, assign 2 descriptors, + * 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, + DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT); + if (!desc) { + dev_err(port->dev, "Preparing DMA cyclic failed\n"); + goto chan_err; + } + desc->callback = atmel_complete_rx_dma; + desc->callback_param = port; + atmel_port->desc_rx = desc; + atmel_port->cookie_rx = dmaengine_submit(desc); + if (dma_submit_error(atmel_port->cookie_rx)) { + dev_err(port->dev, "dma_submit_error %d\n", + atmel_port->cookie_rx); + goto chan_err; + } + + dma_async_issue_pending(atmel_port->chan_rx); + + return 0; + +chan_err: + dev_err(port->dev, "RX channel not available, switch to pio\n"); + atmel_port->use_dma_rx = false; + if (atmel_port->chan_rx) + atmel_release_rx_dma(port); + return -EINVAL; +} + +static void atmel_uart_timer_callback(struct timer_list *t) +{ + struct atmel_uart_port *atmel_port = from_timer(atmel_port, t, + uart_timer); + struct uart_port *port = &atmel_port->uart; + + if (!atomic_read(&atmel_port->tasklet_shutdown)) { + tasklet_schedule(&atmel_port->tasklet_rx); + mod_timer(&atmel_port->uart_timer, + jiffies + uart_poll_timeout(port)); + } +} + +/* + * receive interrupt handler. + */ +static void +atmel_handle_receive(struct uart_port *port, unsigned int pending) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + + if (atmel_use_pdc_rx(port)) { + /* + * PDC receive. Just schedule the tasklet and let it + * figure out the details. + * + * TODO: We're not handling error flags correctly at + * the moment. + */ + if (pending & (ATMEL_US_ENDRX | ATMEL_US_TIMEOUT)) { + atmel_uart_writel(port, ATMEL_US_IDR, + (ATMEL_US_ENDRX | ATMEL_US_TIMEOUT)); + atmel_tasklet_schedule(atmel_port, + &atmel_port->tasklet_rx); + } + + if (pending & (ATMEL_US_RXBRK | ATMEL_US_OVRE | + ATMEL_US_FRAME | ATMEL_US_PARE)) + atmel_pdc_rxerr(port, pending); + } + + if (atmel_use_dma_rx(port)) { + if (pending & ATMEL_US_TIMEOUT) { + atmel_uart_writel(port, ATMEL_US_IDR, + ATMEL_US_TIMEOUT); + atmel_tasklet_schedule(atmel_port, + &atmel_port->tasklet_rx); + } + } + + /* Interrupt receive */ + if (pending & ATMEL_US_RXRDY) + atmel_rx_chars(port); + else if (pending & ATMEL_US_RXBRK) { + /* + * End of break detected. If it came along with a + * character, atmel_rx_chars will handle it. + */ + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_RSTSTA); + atmel_uart_writel(port, ATMEL_US_IDR, ATMEL_US_RXBRK); + atmel_port->break_active = 0; + } +} + +/* + * transmit interrupt handler. (Transmit is IRQF_NODELAY safe) + */ +static void +atmel_handle_transmit(struct uart_port *port, unsigned int pending) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + + if (pending & atmel_port->tx_done_mask) { + atmel_uart_writel(port, ATMEL_US_IDR, + atmel_port->tx_done_mask); + + /* Start RX if flag was set and FIFO is empty */ + if (atmel_port->hd_start_rx) { + if (!(atmel_uart_readl(port, ATMEL_US_CSR) + & ATMEL_US_TXEMPTY)) + dev_warn(port->dev, "Should start RX, but TX fifo is not empty\n"); + + atmel_port->hd_start_rx = false; + atmel_start_rx(port); + } + + atmel_tasklet_schedule(atmel_port, &atmel_port->tasklet_tx); + } +} + +/* + * status flags interrupt handler. + */ +static void +atmel_handle_status(struct uart_port *port, unsigned int pending, + unsigned int status) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + unsigned int status_change; + + if (pending & (ATMEL_US_RIIC | ATMEL_US_DSRIC | ATMEL_US_DCDIC + | ATMEL_US_CTSIC)) { + status_change = status ^ atmel_port->irq_status_prev; + atmel_port->irq_status_prev = status; + + if (status_change & (ATMEL_US_RI | ATMEL_US_DSR + | ATMEL_US_DCD | ATMEL_US_CTS)) { + /* TODO: All reads to CSR will clear these interrupts! */ + if (status_change & ATMEL_US_RI) + port->icount.rng++; + if (status_change & ATMEL_US_DSR) + port->icount.dsr++; + if (status_change & ATMEL_US_DCD) + uart_handle_dcd_change(port, !(status & ATMEL_US_DCD)); + if (status_change & ATMEL_US_CTS) + uart_handle_cts_change(port, !(status & ATMEL_US_CTS)); + + wake_up_interruptible(&port->state->port.delta_msr_wait); + } + } + + if (pending & (ATMEL_US_NACK | ATMEL_US_ITERATION)) + dev_dbg(port->dev, "ISO7816 ERROR (0x%08x)\n", pending); +} + +/* + * Interrupt handler + */ +static irqreturn_t atmel_interrupt(int irq, void *dev_id) +{ + struct uart_port *port = dev_id; + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + unsigned int status, pending, mask, pass_counter = 0; + + spin_lock(&atmel_port->lock_suspended); + + do { + status = atmel_uart_readl(port, ATMEL_US_CSR); + mask = atmel_uart_readl(port, ATMEL_US_IMR); + pending = status & mask; + if (!pending) + break; + + if (atmel_port->suspended) { + atmel_port->pending |= pending; + atmel_port->pending_status = status; + atmel_uart_writel(port, ATMEL_US_IDR, mask); + pm_system_wakeup(); + break; + } + + atmel_handle_receive(port, pending); + atmel_handle_status(port, pending, status); + atmel_handle_transmit(port, pending); + } while (pass_counter++ < ATMEL_ISR_PASS_LIMIT); + + spin_unlock(&atmel_port->lock_suspended); + + return pass_counter ? IRQ_HANDLED : IRQ_NONE; +} + +static void atmel_release_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; + + dma_unmap_single(port->dev, + pdc->dma_addr, + pdc->dma_size, + DMA_TO_DEVICE); +} + +/* + * Called from tasklet with ENDTX and TXBUFE interrupts disabled. + */ +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 atmel_dma_buffer *pdc = &atmel_port->pdc_tx; + int count; + + /* nothing left to transmit? */ + if (atmel_uart_readl(port, ATMEL_PDC_TCR)) + return; + uart_xmit_advance(port, pdc->ofs); + pdc->ofs = 0; + + /* more to transmit - setup next transfer */ + + /* disable PDC transmit */ + atmel_uart_writel(port, ATMEL_PDC_PTCR, ATMEL_PDC_TXTDIS); + + if (!uart_circ_empty(xmit) && !uart_tx_stopped(port)) { + 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); + pdc->ofs = count; + + atmel_uart_writel(port, ATMEL_PDC_TPR, + pdc->dma_addr + xmit->tail); + atmel_uart_writel(port, ATMEL_PDC_TCR, count); + /* re-enable PDC transmit */ + atmel_uart_writel(port, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN); + /* Enable interrupts */ + atmel_uart_writel(port, ATMEL_US_IER, + atmel_port->tx_done_mask); + } else { + if (atmel_uart_is_half_duplex(port)) { + /* DMA done, stop TX, start RX for RS485 */ + atmel_start_rx(port); + } + } + + if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + uart_write_wakeup(port); +} + +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; + + pdc->buf = xmit->buf; + pdc->dma_addr = dma_map_single(port->dev, + pdc->buf, + UART_XMIT_SIZE, + DMA_TO_DEVICE); + pdc->dma_size = UART_XMIT_SIZE; + pdc->ofs = 0; + + return 0; +} + +static void atmel_rx_from_ring(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + struct circ_buf *ring = &atmel_port->rx_ring; + unsigned int status; + u8 flg; + + while (ring->head != ring->tail) { + struct atmel_uart_char c; + + /* Make sure c is loaded after head. */ + smp_rmb(); + + c = ((struct atmel_uart_char *)ring->buf)[ring->tail]; + + ring->tail = (ring->tail + 1) & (ATMEL_SERIAL_RINGSIZE - 1); + + port->icount.rx++; + status = c.status; + flg = TTY_NORMAL; + + /* + * note that the error handling code is + * out of the main execution path + */ + if (unlikely(status & (ATMEL_US_PARE | ATMEL_US_FRAME + | ATMEL_US_OVRE | ATMEL_US_RXBRK))) { + if (status & ATMEL_US_RXBRK) { + /* ignore side-effect */ + status &= ~(ATMEL_US_PARE | ATMEL_US_FRAME); + + port->icount.brk++; + if (uart_handle_break(port)) + continue; + } + if (status & ATMEL_US_PARE) + port->icount.parity++; + if (status & ATMEL_US_FRAME) + port->icount.frame++; + if (status & ATMEL_US_OVRE) + port->icount.overrun++; + + status &= port->read_status_mask; + + if (status & ATMEL_US_RXBRK) + flg = TTY_BREAK; + else if (status & ATMEL_US_PARE) + flg = TTY_PARITY; + else if (status & ATMEL_US_FRAME) + flg = TTY_FRAME; + } + + + if (uart_handle_sysrq_char(port, c.ch)) + continue; + + uart_insert_char(port, status, ATMEL_US_OVRE, c.ch, flg); + } + + tty_flip_buffer_push(&port->state->port); +} + +static void atmel_release_rx_pdc(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + int i; + + for (i = 0; i < 2; i++) { + struct atmel_dma_buffer *pdc = &atmel_port->pdc_rx[i]; + + dma_unmap_single(port->dev, + pdc->dma_addr, + pdc->dma_size, + DMA_FROM_DEVICE); + kfree(pdc->buf); + } +} + +static void atmel_rx_from_pdc(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + struct tty_port *tport = &port->state->port; + struct atmel_dma_buffer *pdc; + int rx_idx = atmel_port->pdc_rx_idx; + unsigned int head; + unsigned int tail; + unsigned int count; + + do { + /* Reset the UART timeout early so that we don't miss one */ + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_STTTO); + + pdc = &atmel_port->pdc_rx[rx_idx]; + head = atmel_uart_readl(port, ATMEL_PDC_RPR) - pdc->dma_addr; + tail = pdc->ofs; + + /* If the PDC has switched buffers, RPR won't contain + * any address within the current buffer. Since head + * is unsigned, we just need a one-way comparison to + * find out. + * + * In this case, we just need to consume the entire + * buffer and resubmit it for DMA. This will clear the + * ENDRX bit as well, so that we can safely re-enable + * all interrupts below. + */ + head = min(head, pdc->dma_size); + + if (likely(head != tail)) { + dma_sync_single_for_cpu(port->dev, pdc->dma_addr, + pdc->dma_size, DMA_FROM_DEVICE); + + /* + * head will only wrap around when we recycle + * the DMA buffer, and when that happens, we + * explicitly set tail to 0. So head will + * always be greater than tail. + */ + count = head - tail; + + tty_insert_flip_string(tport, pdc->buf + pdc->ofs, + count); + + dma_sync_single_for_device(port->dev, pdc->dma_addr, + pdc->dma_size, DMA_FROM_DEVICE); + + port->icount.rx += count; + pdc->ofs = head; + } + + /* + * If the current buffer is full, we need to check if + * the next one contains any additional data. + */ + if (head >= pdc->dma_size) { + pdc->ofs = 0; + atmel_uart_writel(port, ATMEL_PDC_RNPR, pdc->dma_addr); + atmel_uart_writel(port, ATMEL_PDC_RNCR, pdc->dma_size); + + rx_idx = !rx_idx; + atmel_port->pdc_rx_idx = rx_idx; + } + } while (head >= pdc->dma_size); + + tty_flip_buffer_push(tport); + + atmel_uart_writel(port, ATMEL_US_IER, + ATMEL_US_ENDRX | ATMEL_US_TIMEOUT); +} + +static int atmel_prepare_rx_pdc(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + int i; + + for (i = 0; i < 2; i++) { + struct atmel_dma_buffer *pdc = &atmel_port->pdc_rx[i]; + + pdc->buf = kmalloc(PDC_BUFFER_SIZE, GFP_KERNEL); + if (pdc->buf == NULL) { + if (i != 0) { + dma_unmap_single(port->dev, + atmel_port->pdc_rx[0].dma_addr, + PDC_BUFFER_SIZE, + DMA_FROM_DEVICE); + kfree(atmel_port->pdc_rx[0].buf); + } + atmel_port->use_pdc_rx = false; + return -ENOMEM; + } + pdc->dma_addr = dma_map_single(port->dev, + pdc->buf, + PDC_BUFFER_SIZE, + DMA_FROM_DEVICE); + pdc->dma_size = PDC_BUFFER_SIZE; + pdc->ofs = 0; + } + + atmel_port->pdc_rx_idx = 0; + + atmel_uart_writel(port, ATMEL_PDC_RPR, atmel_port->pdc_rx[0].dma_addr); + atmel_uart_writel(port, ATMEL_PDC_RCR, PDC_BUFFER_SIZE); + + atmel_uart_writel(port, ATMEL_PDC_RNPR, + atmel_port->pdc_rx[1].dma_addr); + atmel_uart_writel(port, ATMEL_PDC_RNCR, PDC_BUFFER_SIZE); + + return 0; +} + +/* + * tasklet handling tty stuff outside the interrupt handler. + */ +static void atmel_tasklet_rx_func(struct tasklet_struct *t) +{ + struct atmel_uart_port *atmel_port = from_tasklet(atmel_port, t, + tasklet_rx); + struct uart_port *port = &atmel_port->uart; + + /* The interrupt handler does not take the lock */ + spin_lock(&port->lock); + atmel_port->schedule_rx(port); + spin_unlock(&port->lock); +} + +static void atmel_tasklet_tx_func(struct tasklet_struct *t) +{ + struct atmel_uart_port *atmel_port = from_tasklet(atmel_port, t, + tasklet_tx); + struct uart_port *port = &atmel_port->uart; + + /* The interrupt handler does not take the lock */ + spin_lock(&port->lock); + atmel_port->schedule_tx(port); + spin_unlock(&port->lock); +} + +static void atmel_init_property(struct atmel_uart_port *atmel_port, + struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + + /* DMA/PDC usage specification */ + if (of_property_read_bool(np, "atmel,use-dma-rx")) { + if (of_property_read_bool(np, "dmas")) { + atmel_port->use_dma_rx = true; + atmel_port->use_pdc_rx = false; + } else { + atmel_port->use_dma_rx = false; + atmel_port->use_pdc_rx = true; + } + } else { + atmel_port->use_dma_rx = false; + atmel_port->use_pdc_rx = false; + } + + if (of_property_read_bool(np, "atmel,use-dma-tx")) { + if (of_property_read_bool(np, "dmas")) { + atmel_port->use_dma_tx = true; + atmel_port->use_pdc_tx = false; + } else { + atmel_port->use_dma_tx = false; + atmel_port->use_pdc_tx = true; + } + } else { + atmel_port->use_dma_tx = false; + atmel_port->use_pdc_tx = false; + } +} + +static void atmel_set_ops(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + + if (atmel_use_dma_rx(port)) { + atmel_port->prepare_rx = &atmel_prepare_rx_dma; + atmel_port->schedule_rx = &atmel_rx_from_dma; + atmel_port->release_rx = &atmel_release_rx_dma; + } else if (atmel_use_pdc_rx(port)) { + atmel_port->prepare_rx = &atmel_prepare_rx_pdc; + atmel_port->schedule_rx = &atmel_rx_from_pdc; + atmel_port->release_rx = &atmel_release_rx_pdc; + } else { + atmel_port->prepare_rx = NULL; + atmel_port->schedule_rx = &atmel_rx_from_ring; + atmel_port->release_rx = NULL; + } + + if (atmel_use_dma_tx(port)) { + atmel_port->prepare_tx = &atmel_prepare_tx_dma; + atmel_port->schedule_tx = &atmel_tx_dma; + atmel_port->release_tx = &atmel_release_tx_dma; + } else if (atmel_use_pdc_tx(port)) { + atmel_port->prepare_tx = &atmel_prepare_tx_pdc; + atmel_port->schedule_tx = &atmel_tx_pdc; + atmel_port->release_tx = &atmel_release_tx_pdc; + } else { + atmel_port->prepare_tx = NULL; + atmel_port->schedule_tx = &atmel_tx_chars; + atmel_port->release_tx = NULL; + } +} + +/* + * Get ip name usart or uart + */ +static void atmel_get_ip_name(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + int name = atmel_uart_readl(port, ATMEL_US_NAME); + u32 version; + u32 usart, dbgu_uart, new_uart; + /* ASCII decoding for IP version */ + usart = 0x55534152; /* USAR(T) */ + dbgu_uart = 0x44424755; /* DBGU */ + new_uart = 0x55415254; /* UART */ + + /* + * Only USART devices from at91sam9260 SOC implement fractional + * baudrate. It is available for all asynchronous modes, with the + * following restriction: the sampling clock's duty cycle is not + * constant. + */ + atmel_port->has_frac_baudrate = false; + atmel_port->has_hw_timer = false; + atmel_port->is_usart = false; + + if (name == new_uart) { + dev_dbg(port->dev, "Uart with hw timer"); + atmel_port->has_hw_timer = true; + atmel_port->rtor = ATMEL_UA_RTOR; + } else if (name == usart) { + dev_dbg(port->dev, "Usart\n"); + atmel_port->has_frac_baudrate = true; + atmel_port->has_hw_timer = true; + atmel_port->is_usart = true; + atmel_port->rtor = ATMEL_US_RTOR; + version = atmel_uart_readl(port, ATMEL_US_VERSION); + switch (version) { + case 0x814: /* sama5d2 */ + fallthrough; + case 0x701: /* sama5d4 */ + atmel_port->fidi_min = 3; + atmel_port->fidi_max = 65535; + break; + case 0x502: /* sam9x5, sama5d3 */ + atmel_port->fidi_min = 3; + atmel_port->fidi_max = 2047; + break; + default: + atmel_port->fidi_min = 1; + atmel_port->fidi_max = 2047; + } + } else if (name == dbgu_uart) { + dev_dbg(port->dev, "Dbgu or uart without hw timer\n"); + } else { + /* fallback for older SoCs: use version field */ + version = atmel_uart_readl(port, ATMEL_US_VERSION); + switch (version) { + case 0x302: + case 0x10213: + case 0x10302: + dev_dbg(port->dev, "This version is usart\n"); + atmel_port->has_frac_baudrate = true; + atmel_port->has_hw_timer = true; + atmel_port->is_usart = true; + atmel_port->rtor = ATMEL_US_RTOR; + break; + case 0x203: + case 0x10202: + dev_dbg(port->dev, "This version is uart\n"); + break; + default: + dev_err(port->dev, "Not supported ip name nor version, set to uart\n"); + } + } +} + +/* + * Perform initialization and enable port for reception + */ +static int atmel_startup(struct uart_port *port) +{ + struct platform_device *pdev = to_platform_device(port->dev); + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + int retval; + + /* + * Ensure that no interrupts are enabled otherwise when + * request_irq() is called we could get stuck trying to + * handle an unexpected interrupt + */ + atmel_uart_writel(port, ATMEL_US_IDR, -1); + atmel_port->ms_irq_enabled = false; + + /* + * Allocate the IRQ + */ + retval = request_irq(port->irq, atmel_interrupt, + IRQF_SHARED | IRQF_COND_SUSPEND, + dev_name(&pdev->dev), port); + if (retval) { + dev_err(port->dev, "atmel_startup - Can't get irq\n"); + return retval; + } + + atomic_set(&atmel_port->tasklet_shutdown, 0); + tasklet_setup(&atmel_port->tasklet_rx, atmel_tasklet_rx_func); + tasklet_setup(&atmel_port->tasklet_tx, atmel_tasklet_tx_func); + + /* + * Initialize DMA (if necessary) + */ + atmel_init_property(atmel_port, pdev); + atmel_set_ops(port); + + if (atmel_port->prepare_rx) { + retval = atmel_port->prepare_rx(port); + if (retval < 0) + atmel_set_ops(port); + } + + if (atmel_port->prepare_tx) { + retval = atmel_port->prepare_tx(port); + if (retval < 0) + atmel_set_ops(port); + } + + /* + * Enable FIFO when available + */ + if (atmel_port->fifo_size) { + unsigned int txrdym = ATMEL_US_ONE_DATA; + unsigned int rxrdym = ATMEL_US_ONE_DATA; + unsigned int fmr; + + atmel_uart_writel(port, ATMEL_US_CR, + ATMEL_US_FIFOEN | + ATMEL_US_RXFCLR | + ATMEL_US_TXFLCLR); + + if (atmel_use_dma_tx(port)) + txrdym = ATMEL_US_FOUR_DATA; + + fmr = ATMEL_US_TXRDYM(txrdym) | ATMEL_US_RXRDYM(rxrdym); + if (atmel_port->rts_high && + atmel_port->rts_low) + fmr |= ATMEL_US_FRTSC | + ATMEL_US_RXFTHRES(atmel_port->rts_high) | + ATMEL_US_RXFTHRES2(atmel_port->rts_low); + + atmel_uart_writel(port, ATMEL_US_FMR, fmr); + } + + /* Save current CSR for comparison in atmel_tasklet_func() */ + atmel_port->irq_status_prev = atmel_uart_readl(port, ATMEL_US_CSR); + + /* + * Finally, enable the serial port + */ + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_RSTSTA | ATMEL_US_RSTRX); + /* enable xmit & rcvr */ + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXEN | ATMEL_US_RXEN); + atmel_port->tx_stopped = false; + + timer_setup(&atmel_port->uart_timer, atmel_uart_timer_callback, 0); + + if (atmel_use_pdc_rx(port)) { + /* set UART timeout */ + if (!atmel_port->has_hw_timer) { + mod_timer(&atmel_port->uart_timer, + jiffies + uart_poll_timeout(port)); + /* set USART timeout */ + } else { + atmel_uart_writel(port, atmel_port->rtor, + PDC_RX_TIMEOUT); + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_STTTO); + + atmel_uart_writel(port, ATMEL_US_IER, + ATMEL_US_ENDRX | ATMEL_US_TIMEOUT); + } + /* enable PDC controller */ + atmel_uart_writel(port, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN); + } else if (atmel_use_dma_rx(port)) { + /* set UART timeout */ + if (!atmel_port->has_hw_timer) { + mod_timer(&atmel_port->uart_timer, + jiffies + uart_poll_timeout(port)); + /* set USART timeout */ + } else { + atmel_uart_writel(port, atmel_port->rtor, + PDC_RX_TIMEOUT); + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_STTTO); + + atmel_uart_writel(port, ATMEL_US_IER, + ATMEL_US_TIMEOUT); + } + } else { + /* enable receive only */ + atmel_uart_writel(port, ATMEL_US_IER, ATMEL_US_RXRDY); + } + + return 0; +} + +/* + * Flush any TX data submitted for DMA. Called when the TX circular + * buffer is reset. + */ +static void atmel_flush_buffer(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + + if (atmel_use_pdc_tx(port)) { + atmel_uart_writel(port, ATMEL_PDC_TCR, 0); + atmel_port->pdc_tx.ofs = 0; + } + /* + * in uart_flush_buffer(), the xmit circular buffer has just + * been cleared, so we have to reset tx_len accordingly. + */ + atmel_port->tx_len = 0; +} + +/* + * Disable the port + */ +static void atmel_shutdown(struct uart_port *port) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + + /* Disable modem control lines interrupts */ + atmel_disable_ms(port); + + /* Disable interrupts at device level */ + atmel_uart_writel(port, ATMEL_US_IDR, -1); + + /* Prevent spurious interrupts from scheduling the tasklet */ + atomic_inc(&atmel_port->tasklet_shutdown); + + /* + * Prevent any tasklets being scheduled during + * cleanup + */ + del_timer_sync(&atmel_port->uart_timer); + + /* Make sure that no interrupt is on the fly */ + synchronize_irq(port->irq); + + /* + * Clear out any scheduled tasklets before + * we destroy the buffers + */ + tasklet_kill(&atmel_port->tasklet_rx); + tasklet_kill(&atmel_port->tasklet_tx); + + /* + * Ensure everything is stopped and + * disable port and break condition. + */ + atmel_stop_rx(port); + atmel_stop_tx(port); + + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_RSTSTA); + + /* + * Shut-down the DMA. + */ + if (atmel_port->release_rx) + atmel_port->release_rx(port); + if (atmel_port->release_tx) + atmel_port->release_tx(port); + + /* + * Reset ring buffer pointers + */ + atmel_port->rx_ring.head = 0; + atmel_port->rx_ring.tail = 0; + + /* + * Free the interrupts + */ + free_irq(port->irq, port); + + atmel_flush_buffer(port); +} + +/* + * Power / Clock management. + */ +static void atmel_serial_pm(struct uart_port *port, unsigned int state, + unsigned int oldstate) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + + switch (state) { + case UART_PM_STATE_ON: + /* + * Enable the peripheral clock for this serial port. + * This is called on uart_open() or a resume event. + */ + clk_prepare_enable(atmel_port->clk); + + /* re-enable interrupts if we disabled some on suspend */ + atmel_uart_writel(port, ATMEL_US_IER, atmel_port->backup_imr); + break; + case UART_PM_STATE_OFF: + /* Back up the interrupt mask and disable all interrupts */ + atmel_port->backup_imr = atmel_uart_readl(port, ATMEL_US_IMR); + atmel_uart_writel(port, ATMEL_US_IDR, -1); + + /* + * Disable the peripheral clock for this serial port. + * This is called on uart_close() or a suspend event. + */ + clk_disable_unprepare(atmel_port->clk); + if (__clk_is_enabled(atmel_port->gclk)) + clk_disable_unprepare(atmel_port->gclk); + break; + default: + dev_err(port->dev, "atmel_serial: unknown pm %d\n", state); + } +} + +/* + * Change the port parameters + */ +static void atmel_set_termios(struct uart_port *port, + struct ktermios *termios, + const struct ktermios *old) +{ + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + unsigned long flags; + unsigned int old_mode, mode, imr, quot, div, cd, fp = 0; + unsigned int baud, actual_baud, gclk_rate; + int ret; + + /* save the current mode register */ + mode = old_mode = atmel_uart_readl(port, ATMEL_US_MR); + + /* reset the mode, clock divisor, parity, stop bits and data size */ + if (atmel_port->is_usart) + mode &= ~(ATMEL_US_NBSTOP | ATMEL_US_PAR | ATMEL_US_CHRL | + ATMEL_US_USCLKS | ATMEL_US_USMODE); + else + mode &= ~(ATMEL_UA_BRSRCCK | ATMEL_US_PAR | ATMEL_UA_FILTER); + + baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16); + + /* byte size */ + switch (termios->c_cflag & CSIZE) { + case CS5: + mode |= ATMEL_US_CHRL_5; + break; + case CS6: + mode |= ATMEL_US_CHRL_6; + break; + case CS7: + mode |= ATMEL_US_CHRL_7; + break; + default: + mode |= ATMEL_US_CHRL_8; + break; + } + + /* stop bits */ + if (termios->c_cflag & CSTOPB) + mode |= ATMEL_US_NBSTOP_2; + + /* parity */ + if (termios->c_cflag & PARENB) { + /* Mark or Space parity */ + if (termios->c_cflag & CMSPAR) { + if (termios->c_cflag & PARODD) + mode |= ATMEL_US_PAR_MARK; + else + mode |= ATMEL_US_PAR_SPACE; + } else if (termios->c_cflag & PARODD) + mode |= ATMEL_US_PAR_ODD; + else + mode |= ATMEL_US_PAR_EVEN; + } else + mode |= ATMEL_US_PAR_NONE; + + spin_lock_irqsave(&port->lock, flags); + + port->read_status_mask = ATMEL_US_OVRE; + if (termios->c_iflag & INPCK) + port->read_status_mask |= (ATMEL_US_FRAME | ATMEL_US_PARE); + if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK)) + port->read_status_mask |= ATMEL_US_RXBRK; + + if (atmel_use_pdc_rx(port)) + /* need to enable error interrupts */ + atmel_uart_writel(port, ATMEL_US_IER, port->read_status_mask); + + /* + * Characters to ignore + */ + port->ignore_status_mask = 0; + if (termios->c_iflag & IGNPAR) + port->ignore_status_mask |= (ATMEL_US_FRAME | ATMEL_US_PARE); + if (termios->c_iflag & IGNBRK) { + port->ignore_status_mask |= ATMEL_US_RXBRK; + /* + * If we're ignoring parity and break indicators, + * ignore overruns too (for real raw support). + */ + if (termios->c_iflag & IGNPAR) + port->ignore_status_mask |= ATMEL_US_OVRE; + } + /* TODO: Ignore all characters if CREAD is set.*/ + + /* update the per-port timeout */ + uart_update_timeout(port, termios->c_cflag, baud); + + /* + * save/disable interrupts. The tty layer will ensure that the + * transmitter is empty if requested by the caller, so there's + * no need to wait for it here. + */ + imr = atmel_uart_readl(port, ATMEL_US_IMR); + atmel_uart_writel(port, ATMEL_US_IDR, -1); + + /* disable receiver and transmitter */ + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXDIS | ATMEL_US_RXDIS); + atmel_port->tx_stopped = true; + + /* mode */ + if (port->rs485.flags & SER_RS485_ENABLED) { + atmel_uart_writel(port, ATMEL_US_TTGR, + port->rs485.delay_rts_after_send); + mode |= ATMEL_US_USMODE_RS485; + } else if (port->iso7816.flags & SER_ISO7816_ENABLED) { + atmel_uart_writel(port, ATMEL_US_TTGR, port->iso7816.tg); + /* select mck clock, and output */ + mode |= ATMEL_US_USCLKS_MCK | ATMEL_US_CLKO; + /* set max iterations */ + mode |= ATMEL_US_MAX_ITER(3); + if ((port->iso7816.flags & SER_ISO7816_T_PARAM) + == SER_ISO7816_T(0)) + mode |= ATMEL_US_USMODE_ISO7816_T0; + else + mode |= ATMEL_US_USMODE_ISO7816_T1; + } else if (termios->c_cflag & CRTSCTS) { + /* RS232 with hardware handshake (RTS/CTS) */ + if (atmel_use_fifo(port) && + !mctrl_gpio_to_gpiod(atmel_port->gpios, UART_GPIO_CTS)) { + /* + * with ATMEL_US_USMODE_HWHS set, the controller will + * be able to drive the RTS pin high/low when the RX + * FIFO is above RXFTHRES/below RXFTHRES2. + * It will also disable the transmitter when the CTS + * pin is high. + * This mode is not activated if CTS pin is a GPIO + * because in this case, the transmitter is always + * disabled (there must be an internal pull-up + * responsible for this behaviour). + * If the RTS pin is a GPIO, the controller won't be + * able to drive it according to the FIFO thresholds, + * but it will be handled by the driver. + */ + mode |= ATMEL_US_USMODE_HWHS; + } else { + /* + * For platforms without FIFO, the flow control is + * handled by the driver. + */ + mode |= ATMEL_US_USMODE_NORMAL; + } + } else { + /* RS232 without hadware handshake */ + mode |= ATMEL_US_USMODE_NORMAL; + } + + /* + * Set the baud rate: + * Fractional baudrate allows to setup output frequency more + * accurately. This feature is enabled only when using normal mode. + * baudrate = selected clock / (8 * (2 - OVER) * (CD + FP / 8)) + * Currently, OVER is always set to 0 so we get + * baudrate = selected clock / (16 * (CD + FP / 8)) + * then + * 8 CD + FP = selected clock / (2 * baudrate) + */ + if (atmel_port->has_frac_baudrate) { + div = DIV_ROUND_CLOSEST(port->uartclk, baud * 2); + cd = div >> 3; + fp = div & ATMEL_US_FP_MASK; + } else { + cd = uart_get_divisor(port, baud); + } + + /* + * If the current value of the Clock Divisor surpasses the 16 bit + * ATMEL_US_CD mask and the IP is USART, switch to the Peripheral + * Clock implicitly divided by 8. + * If the IP is UART however, keep the highest possible value for + * the CD and avoid needless division of CD, since UART IP's do not + * support implicit division of the Peripheral Clock. + */ + if (atmel_port->is_usart && cd > ATMEL_US_CD) { + cd /= 8; + mode |= ATMEL_US_USCLKS_MCK_DIV8; + } else { + cd = min_t(unsigned int, cd, ATMEL_US_CD); + } + + /* + * If there is no Fractional Part, there is a high chance that + * we may be able to generate a baudrate closer to the desired one + * if we use the GCLK as the clock source driving the baudrate + * generator. + */ + if (!atmel_port->has_frac_baudrate) { + if (__clk_is_enabled(atmel_port->gclk)) + clk_disable_unprepare(atmel_port->gclk); + gclk_rate = clk_round_rate(atmel_port->gclk, 16 * baud); + actual_baud = clk_get_rate(atmel_port->clk) / (16 * cd); + if (gclk_rate && abs(atmel_error_rate(baud, actual_baud)) > + abs(atmel_error_rate(baud, gclk_rate / 16))) { + clk_set_rate(atmel_port->gclk, 16 * baud); + ret = clk_prepare_enable(atmel_port->gclk); + if (ret) + goto gclk_fail; + + if (atmel_port->is_usart) { + mode &= ~ATMEL_US_USCLKS; + mode |= ATMEL_US_USCLKS_GCLK; + } else { + mode |= ATMEL_UA_BRSRCCK; + } + + /* + * Set the Clock Divisor for GCLK to 1. + * Since we were able to generate the smallest + * multiple of the desired baudrate times 16, + * then we surely can generate a bigger multiple + * with the exact error rate for an equally increased + * CD. Thus no need to take into account + * a higher value for CD. + */ + cd = 1; + } + } + +gclk_fail: + quot = cd | fp << ATMEL_US_FP_OFFSET; + + if (!(port->iso7816.flags & SER_ISO7816_ENABLED)) + atmel_uart_writel(port, ATMEL_US_BRGR, quot); + + /* set the mode, clock divisor, parity, stop bits and data size */ + atmel_uart_writel(port, ATMEL_US_MR, mode); + + /* + * when switching the mode, set the RTS line state according to the + * new mode, otherwise keep the former state + */ + if ((old_mode & ATMEL_US_USMODE) != (mode & ATMEL_US_USMODE)) { + unsigned int rts_state; + + if ((mode & ATMEL_US_USMODE) == ATMEL_US_USMODE_HWHS) { + /* let the hardware control the RTS line */ + rts_state = ATMEL_US_RTSDIS; + } else { + /* force RTS line to low level */ + rts_state = ATMEL_US_RTSEN; + } + + atmel_uart_writel(port, ATMEL_US_CR, rts_state); + } + + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_RSTSTA | ATMEL_US_RSTRX); + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXEN | ATMEL_US_RXEN); + atmel_port->tx_stopped = false; + + /* restore interrupts */ + atmel_uart_writel(port, ATMEL_US_IER, imr); + + /* CTS flow-control and modem-status interrupts */ + if (UART_ENABLE_MS(port, termios->c_cflag)) + atmel_enable_ms(port); + else + atmel_disable_ms(port); + + spin_unlock_irqrestore(&port->lock, flags); +} + +static void atmel_set_ldisc(struct uart_port *port, struct ktermios *termios) +{ + if (termios->c_line == N_PPS) { + port->flags |= UPF_HARDPPS_CD; + spin_lock_irq(&port->lock); + atmel_enable_ms(port); + spin_unlock_irq(&port->lock); + } else { + port->flags &= ~UPF_HARDPPS_CD; + if (!UART_ENABLE_MS(port, termios->c_cflag)) { + spin_lock_irq(&port->lock); + atmel_disable_ms(port); + spin_unlock_irq(&port->lock); + } + } +} + +/* + * Return string describing the specified port + */ +static const char *atmel_type(struct uart_port *port) +{ + return (port->type == PORT_ATMEL) ? "ATMEL_SERIAL" : NULL; +} + +/* + * Release the memory region(s) being used by 'port'. + */ +static void atmel_release_port(struct uart_port *port) +{ + struct platform_device *mpdev = to_platform_device(port->dev->parent); + int size = resource_size(mpdev->resource); + + release_mem_region(port->mapbase, size); + + if (port->flags & UPF_IOREMAP) { + iounmap(port->membase); + port->membase = NULL; + } +} + +/* + * Request the memory region(s) being used by 'port'. + */ +static int atmel_request_port(struct uart_port *port) +{ + struct platform_device *mpdev = to_platform_device(port->dev->parent); + int size = resource_size(mpdev->resource); + + if (!request_mem_region(port->mapbase, size, "atmel_serial")) + return -EBUSY; + + if (port->flags & UPF_IOREMAP) { + port->membase = ioremap(port->mapbase, size); + if (port->membase == NULL) { + release_mem_region(port->mapbase, size); + return -ENOMEM; + } + } + + return 0; +} + +/* + * Configure/autoconfigure the port. + */ +static void atmel_config_port(struct uart_port *port, int flags) +{ + if (flags & UART_CONFIG_TYPE) { + port->type = PORT_ATMEL; + atmel_request_port(port); + } +} + +/* + * Verify the new serial_struct (for TIOCSSERIAL). + */ +static int atmel_verify_port(struct uart_port *port, struct serial_struct *ser) +{ + int ret = 0; + if (ser->type != PORT_UNKNOWN && ser->type != PORT_ATMEL) + ret = -EINVAL; + if (port->irq != ser->irq) + ret = -EINVAL; + if (ser->io_type != SERIAL_IO_MEM) + ret = -EINVAL; + if (port->uartclk / 16 != ser->baud_base) + ret = -EINVAL; + if (port->mapbase != (unsigned long)ser->iomem_base) + ret = -EINVAL; + if (port->iobase != ser->port) + ret = -EINVAL; + if (ser->hub6 != 0) + ret = -EINVAL; + return ret; +} + +#ifdef CONFIG_CONSOLE_POLL +static int atmel_poll_get_char(struct uart_port *port) +{ + while (!(atmel_uart_readl(port, ATMEL_US_CSR) & ATMEL_US_RXRDY)) + cpu_relax(); + + return atmel_uart_read_char(port); +} + +static void atmel_poll_put_char(struct uart_port *port, unsigned char ch) +{ + while (!(atmel_uart_readl(port, ATMEL_US_CSR) & ATMEL_US_TXRDY)) + cpu_relax(); + + atmel_uart_write_char(port, ch); +} +#endif + +static const struct uart_ops atmel_pops = { + .tx_empty = atmel_tx_empty, + .set_mctrl = atmel_set_mctrl, + .get_mctrl = atmel_get_mctrl, + .stop_tx = atmel_stop_tx, + .start_tx = atmel_start_tx, + .stop_rx = atmel_stop_rx, + .enable_ms = atmel_enable_ms, + .break_ctl = atmel_break_ctl, + .startup = atmel_startup, + .shutdown = atmel_shutdown, + .flush_buffer = atmel_flush_buffer, + .set_termios = atmel_set_termios, + .set_ldisc = atmel_set_ldisc, + .type = atmel_type, + .release_port = atmel_release_port, + .request_port = atmel_request_port, + .config_port = atmel_config_port, + .verify_port = atmel_verify_port, + .pm = atmel_serial_pm, +#ifdef CONFIG_CONSOLE_POLL + .poll_get_char = atmel_poll_get_char, + .poll_put_char = atmel_poll_put_char, +#endif +}; + +static const struct serial_rs485 atmel_rs485_supported = { + .flags = SER_RS485_ENABLED | SER_RS485_RTS_AFTER_SEND | SER_RS485_RX_DURING_TX, + .delay_rts_before_send = 1, + .delay_rts_after_send = 1, +}; + +/* + * Configure the port from the platform device resource info. + */ +static int atmel_init_port(struct atmel_uart_port *atmel_port, + struct platform_device *pdev) +{ + int ret; + struct uart_port *port = &atmel_port->uart; + struct platform_device *mpdev = to_platform_device(pdev->dev.parent); + + atmel_init_property(atmel_port, pdev); + atmel_set_ops(port); + + port->iotype = UPIO_MEM; + port->flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP; + port->ops = &atmel_pops; + port->fifosize = 1; + port->dev = &pdev->dev; + port->mapbase = mpdev->resource[0].start; + port->irq = platform_get_irq(mpdev, 0); + port->rs485_config = atmel_config_rs485; + port->rs485_supported = atmel_rs485_supported; + port->iso7816_config = atmel_config_iso7816; + port->membase = NULL; + + memset(&atmel_port->rx_ring, 0, sizeof(atmel_port->rx_ring)); + + ret = uart_get_rs485_mode(port); + if (ret) + return ret; + + port->uartclk = clk_get_rate(atmel_port->clk); + + /* + * Use TXEMPTY for interrupt when rs485 or ISO7816 else TXRDY or + * ENDTX|TXBUFE + */ + if (atmel_uart_is_half_duplex(port)) + atmel_port->tx_done_mask = ATMEL_US_TXEMPTY; + else if (atmel_use_pdc_tx(port)) { + port->fifosize = PDC_BUFFER_SIZE; + atmel_port->tx_done_mask = ATMEL_US_ENDTX | ATMEL_US_TXBUFE; + } else { + atmel_port->tx_done_mask = ATMEL_US_TXRDY; + } + + return 0; +} + +#ifdef CONFIG_SERIAL_ATMEL_CONSOLE +static void atmel_console_putchar(struct uart_port *port, unsigned char ch) +{ + while (!(atmel_uart_readl(port, ATMEL_US_CSR) & ATMEL_US_TXRDY)) + cpu_relax(); + atmel_uart_write_char(port, ch); +} + +/* + * Interrupts are disabled on entering + */ +static void atmel_console_write(struct console *co, const char *s, u_int count) +{ + struct uart_port *port = &atmel_ports[co->index].uart; + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + unsigned int status, imr; + unsigned int pdc_tx; + + /* + * First, save IMR and then disable interrupts + */ + imr = atmel_uart_readl(port, ATMEL_US_IMR); + atmel_uart_writel(port, ATMEL_US_IDR, + ATMEL_US_RXRDY | atmel_port->tx_done_mask); + + /* Store PDC transmit status and disable it */ + pdc_tx = atmel_uart_readl(port, ATMEL_PDC_PTSR) & ATMEL_PDC_TXTEN; + atmel_uart_writel(port, ATMEL_PDC_PTCR, ATMEL_PDC_TXTDIS); + + /* Make sure that tx path is actually able to send characters */ + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXEN); + atmel_port->tx_stopped = false; + + uart_console_write(port, s, count, atmel_console_putchar); + + /* + * Finally, wait for transmitter to become empty + * and restore IMR + */ + do { + status = atmel_uart_readl(port, ATMEL_US_CSR); + } while (!(status & ATMEL_US_TXRDY)); + + /* Restore PDC transmit status */ + if (pdc_tx) + atmel_uart_writel(port, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN); + + /* set interrupts back the way they were */ + atmel_uart_writel(port, ATMEL_US_IER, imr); +} + +/* + * If the port was already initialised (eg, by a boot loader), + * try to determine the current setup. + */ +static void __init atmel_console_get_options(struct uart_port *port, int *baud, + int *parity, int *bits) +{ + unsigned int mr, quot; + + /* + * If the baud rate generator isn't running, the port wasn't + * initialized by the boot loader. + */ + quot = atmel_uart_readl(port, ATMEL_US_BRGR) & ATMEL_US_CD; + if (!quot) + return; + + mr = atmel_uart_readl(port, ATMEL_US_MR) & ATMEL_US_CHRL; + if (mr == ATMEL_US_CHRL_8) + *bits = 8; + else + *bits = 7; + + mr = atmel_uart_readl(port, ATMEL_US_MR) & ATMEL_US_PAR; + if (mr == ATMEL_US_PAR_EVEN) + *parity = 'e'; + else if (mr == ATMEL_US_PAR_ODD) + *parity = 'o'; + + *baud = port->uartclk / (16 * quot); +} + +static int __init atmel_console_setup(struct console *co, char *options) +{ + struct uart_port *port = &atmel_ports[co->index].uart; + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + int baud = 115200; + int bits = 8; + int parity = 'n'; + int flow = 'n'; + + if (port->membase == NULL) { + /* Port not initialized yet - delay setup */ + return -ENODEV; + } + + atmel_uart_writel(port, ATMEL_US_IDR, -1); + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_RSTSTA | ATMEL_US_RSTRX); + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXEN | ATMEL_US_RXEN); + atmel_port->tx_stopped = false; + + if (options) + uart_parse_options(options, &baud, &parity, &bits, &flow); + else + atmel_console_get_options(port, &baud, &parity, &bits); + + return uart_set_options(port, co, baud, parity, bits, flow); +} + +static struct uart_driver atmel_uart; + +static struct console atmel_console = { + .name = ATMEL_DEVICENAME, + .write = atmel_console_write, + .device = uart_console_device, + .setup = atmel_console_setup, + .flags = CON_PRINTBUFFER, + .index = -1, + .data = &atmel_uart, +}; + +static void atmel_serial_early_write(struct console *con, const char *s, + unsigned int n) +{ + struct earlycon_device *dev = con->data; + + uart_console_write(&dev->port, s, n, atmel_console_putchar); +} + +static int __init atmel_early_console_setup(struct earlycon_device *device, + const char *options) +{ + if (!device->port.membase) + return -ENODEV; + + device->con->write = atmel_serial_early_write; + + return 0; +} + +OF_EARLYCON_DECLARE(atmel_serial, "atmel,at91rm9200-usart", + atmel_early_console_setup); +OF_EARLYCON_DECLARE(atmel_serial, "atmel,at91sam9260-usart", + atmel_early_console_setup); + +#define ATMEL_CONSOLE_DEVICE (&atmel_console) + +#else +#define ATMEL_CONSOLE_DEVICE NULL +#endif + +static struct uart_driver atmel_uart = { + .owner = THIS_MODULE, + .driver_name = "atmel_serial", + .dev_name = ATMEL_DEVICENAME, + .major = SERIAL_ATMEL_MAJOR, + .minor = MINOR_START, + .nr = ATMEL_MAX_UART, + .cons = ATMEL_CONSOLE_DEVICE, +}; + +static bool atmel_serial_clk_will_stop(void) +{ +#ifdef CONFIG_ARCH_AT91 + return at91_suspend_entering_slow_clock(); +#else + return false; +#endif +} + +static int __maybe_unused atmel_serial_suspend(struct device *dev) +{ + struct uart_port *port = dev_get_drvdata(dev); + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + + if (uart_console(port) && console_suspend_enabled) { + /* Drain the TX shifter */ + while (!(atmel_uart_readl(port, ATMEL_US_CSR) & + ATMEL_US_TXEMPTY)) + cpu_relax(); + } + + if (uart_console(port) && !console_suspend_enabled) { + /* Cache register values as we won't get a full shutdown/startup + * cycle + */ + atmel_port->cache.mr = atmel_uart_readl(port, ATMEL_US_MR); + atmel_port->cache.imr = atmel_uart_readl(port, ATMEL_US_IMR); + atmel_port->cache.brgr = atmel_uart_readl(port, ATMEL_US_BRGR); + atmel_port->cache.rtor = atmel_uart_readl(port, + atmel_port->rtor); + atmel_port->cache.ttgr = atmel_uart_readl(port, ATMEL_US_TTGR); + atmel_port->cache.fmr = atmel_uart_readl(port, ATMEL_US_FMR); + atmel_port->cache.fimr = atmel_uart_readl(port, ATMEL_US_FIMR); + } + + /* we can not wake up if we're running on slow clock */ + atmel_port->may_wakeup = device_may_wakeup(dev); + if (atmel_serial_clk_will_stop()) { + unsigned long flags; + + spin_lock_irqsave(&atmel_port->lock_suspended, flags); + atmel_port->suspended = true; + spin_unlock_irqrestore(&atmel_port->lock_suspended, flags); + device_set_wakeup_enable(dev, 0); + } + + uart_suspend_port(&atmel_uart, port); + + return 0; +} + +static int __maybe_unused atmel_serial_resume(struct device *dev) +{ + struct uart_port *port = dev_get_drvdata(dev); + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + unsigned long flags; + + if (uart_console(port) && !console_suspend_enabled) { + atmel_uart_writel(port, ATMEL_US_MR, atmel_port->cache.mr); + atmel_uart_writel(port, ATMEL_US_IER, atmel_port->cache.imr); + atmel_uart_writel(port, ATMEL_US_BRGR, atmel_port->cache.brgr); + atmel_uart_writel(port, atmel_port->rtor, + atmel_port->cache.rtor); + atmel_uart_writel(port, ATMEL_US_TTGR, atmel_port->cache.ttgr); + + if (atmel_port->fifo_size) { + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_FIFOEN | + ATMEL_US_RXFCLR | ATMEL_US_TXFLCLR); + atmel_uart_writel(port, ATMEL_US_FMR, + atmel_port->cache.fmr); + atmel_uart_writel(port, ATMEL_US_FIER, + atmel_port->cache.fimr); + } + atmel_start_rx(port); + } + + spin_lock_irqsave(&atmel_port->lock_suspended, flags); + if (atmel_port->pending) { + atmel_handle_receive(port, atmel_port->pending); + atmel_handle_status(port, atmel_port->pending, + atmel_port->pending_status); + atmel_handle_transmit(port, atmel_port->pending); + atmel_port->pending = 0; + } + atmel_port->suspended = false; + spin_unlock_irqrestore(&atmel_port->lock_suspended, flags); + + uart_resume_port(&atmel_uart, port); + device_set_wakeup_enable(dev, atmel_port->may_wakeup); + + return 0; +} + +static void atmel_serial_probe_fifos(struct atmel_uart_port *atmel_port, + struct platform_device *pdev) +{ + atmel_port->fifo_size = 0; + atmel_port->rts_low = 0; + atmel_port->rts_high = 0; + + if (of_property_read_u32(pdev->dev.of_node, + "atmel,fifo-size", + &atmel_port->fifo_size)) + return; + + if (!atmel_port->fifo_size) + return; + + if (atmel_port->fifo_size < ATMEL_MIN_FIFO_SIZE) { + atmel_port->fifo_size = 0; + dev_err(&pdev->dev, "Invalid FIFO size\n"); + return; + } + + /* + * 0 <= rts_low <= rts_high <= fifo_size + * Once their CTS line asserted by the remote peer, some x86 UARTs tend + * to flush their internal TX FIFO, commonly up to 16 data, before + * actually stopping to send new data. So we try to set the RTS High + * Threshold to a reasonably high value respecting this 16 data + * empirical rule when possible. + */ + atmel_port->rts_high = max_t(int, atmel_port->fifo_size >> 1, + atmel_port->fifo_size - ATMEL_RTS_HIGH_OFFSET); + atmel_port->rts_low = max_t(int, atmel_port->fifo_size >> 2, + atmel_port->fifo_size - ATMEL_RTS_LOW_OFFSET); + + dev_info(&pdev->dev, "Using FIFO (%u data)\n", + atmel_port->fifo_size); + dev_dbg(&pdev->dev, "RTS High Threshold : %2u data\n", + atmel_port->rts_high); + dev_dbg(&pdev->dev, "RTS Low Threshold : %2u data\n", + atmel_port->rts_low); +} + +static int atmel_serial_probe(struct platform_device *pdev) +{ + struct atmel_uart_port *atmel_port; + struct device_node *np = pdev->dev.parent->of_node; + void *data; + int ret; + bool rs485_enabled; + + BUILD_BUG_ON(ATMEL_SERIAL_RINGSIZE & (ATMEL_SERIAL_RINGSIZE - 1)); + + /* + * In device tree there is no node with "atmel,at91rm9200-usart-serial" + * as compatible string. This driver is probed by at91-usart mfd driver + * which is just a wrapper over the atmel_serial driver and + * spi-at91-usart driver. All attributes needed by this driver are + * found in of_node of parent. + */ + pdev->dev.of_node = np; + + ret = of_alias_get_id(np, "serial"); + if (ret < 0) + /* port id not found in platform data nor device-tree aliases: + * auto-enumerate it */ + ret = find_first_zero_bit(atmel_ports_in_use, ATMEL_MAX_UART); + + if (ret >= ATMEL_MAX_UART) { + ret = -ENODEV; + goto err; + } + + if (test_and_set_bit(ret, atmel_ports_in_use)) { + /* port already in use */ + ret = -EBUSY; + goto err; + } + + atmel_port = &atmel_ports[ret]; + atmel_port->backup_imr = 0; + atmel_port->uart.line = ret; + atmel_port->uart.has_sysrq = IS_ENABLED(CONFIG_SERIAL_ATMEL_CONSOLE); + atmel_serial_probe_fifos(atmel_port, pdev); + + atomic_set(&atmel_port->tasklet_shutdown, 0); + spin_lock_init(&atmel_port->lock_suspended); + + atmel_port->clk = devm_clk_get(&pdev->dev, "usart"); + if (IS_ERR(atmel_port->clk)) { + ret = PTR_ERR(atmel_port->clk); + goto err; + } + ret = clk_prepare_enable(atmel_port->clk); + if (ret) + goto err; + + atmel_port->gclk = devm_clk_get_optional(&pdev->dev, "gclk"); + if (IS_ERR(atmel_port->gclk)) { + ret = PTR_ERR(atmel_port->gclk); + goto err_clk_disable_unprepare; + } + + ret = atmel_init_port(atmel_port, pdev); + if (ret) + goto err_clk_disable_unprepare; + + atmel_port->gpios = mctrl_gpio_init(&atmel_port->uart, 0); + if (IS_ERR(atmel_port->gpios)) { + ret = PTR_ERR(atmel_port->gpios); + goto err_clk_disable_unprepare; + } + + if (!atmel_use_pdc_rx(&atmel_port->uart)) { + ret = -ENOMEM; + data = kmalloc_array(ATMEL_SERIAL_RINGSIZE, + sizeof(struct atmel_uart_char), + GFP_KERNEL); + if (!data) + goto err_clk_disable_unprepare; + atmel_port->rx_ring.buf = data; + } + + rs485_enabled = atmel_port->uart.rs485.flags & SER_RS485_ENABLED; + + ret = uart_add_one_port(&atmel_uart, &atmel_port->uart); + if (ret) + goto err_add_port; + + device_init_wakeup(&pdev->dev, 1); + platform_set_drvdata(pdev, atmel_port); + + if (rs485_enabled) { + atmel_uart_writel(&atmel_port->uart, ATMEL_US_MR, + ATMEL_US_USMODE_NORMAL); + atmel_uart_writel(&atmel_port->uart, ATMEL_US_CR, + ATMEL_US_RTSEN); + } + + /* + * Get port name of usart or uart + */ + atmel_get_ip_name(&atmel_port->uart); + + /* + * The peripheral clock can now safely be disabled till the port + * is used + */ + clk_disable_unprepare(atmel_port->clk); + + return 0; + +err_add_port: + kfree(atmel_port->rx_ring.buf); + atmel_port->rx_ring.buf = NULL; +err_clk_disable_unprepare: + clk_disable_unprepare(atmel_port->clk); + clear_bit(atmel_port->uart.line, atmel_ports_in_use); +err: + return ret; +} + +/* + * Even if the driver is not modular, it makes sense to be able to + * unbind a device: there can be many bound devices, and there are + * situations where dynamic binding and unbinding can be useful. + * + * For example, a connected device can require a specific firmware update + * protocol that needs bitbanging on IO lines, but use the regular serial + * port in the normal case. + */ +static int atmel_serial_remove(struct platform_device *pdev) +{ + struct uart_port *port = platform_get_drvdata(pdev); + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + + tasklet_kill(&atmel_port->tasklet_rx); + tasklet_kill(&atmel_port->tasklet_tx); + + device_init_wakeup(&pdev->dev, 0); + + uart_remove_one_port(&atmel_uart, port); + + kfree(atmel_port->rx_ring.buf); + + /* "port" is allocated statically, so we shouldn't free it */ + + clear_bit(port->line, atmel_ports_in_use); + + pdev->dev.of_node = NULL; + + return 0; +} + +static SIMPLE_DEV_PM_OPS(atmel_serial_pm_ops, atmel_serial_suspend, + atmel_serial_resume); + +static struct platform_driver atmel_serial_driver = { + .probe = atmel_serial_probe, + .remove = atmel_serial_remove, + .driver = { + .name = "atmel_usart_serial", + .of_match_table = of_match_ptr(atmel_serial_dt_ids), + .pm = pm_ptr(&atmel_serial_pm_ops), + }, +}; + +static int __init atmel_serial_init(void) +{ + int ret; + + ret = uart_register_driver(&atmel_uart); + if (ret) + return ret; + + ret = platform_driver_register(&atmel_serial_driver); + if (ret) + uart_unregister_driver(&atmel_uart); + + return ret; +} +device_initcall(atmel_serial_init); |