diff options
Diffstat (limited to 'drivers/tty/serial/8250/8250_omap.c')
| -rw-r--r-- | drivers/tty/serial/8250/8250_omap.c | 1748 |
1 files changed, 1748 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c new file mode 100644 index 000000000..25765ebb7 --- /dev/null +++ b/drivers/tty/serial/8250/8250_omap.c @@ -0,0 +1,1748 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 8250-core based driver for the OMAP internal UART + * + * based on omap-serial.c, Copyright (C) 2010 Texas Instruments. + * + * Copyright (C) 2014 Sebastian Andrzej Siewior + * + */ + +#include <linux/clk.h> +#include <linux/device.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/serial_8250.h> +#include <linux/serial_reg.h> +#include <linux/tty_flip.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/of_gpio.h> +#include <linux/of_irq.h> +#include <linux/delay.h> +#include <linux/pm_runtime.h> +#include <linux/console.h> +#include <linux/pm_qos.h> +#include <linux/pm_wakeirq.h> +#include <linux/dma-mapping.h> +#include <linux/sys_soc.h> + +#include "8250.h" + +#define DEFAULT_CLK_SPEED 48000000 +#define OMAP_UART_REGSHIFT 2 + +#define UART_ERRATA_i202_MDR1_ACCESS (1 << 0) +#define OMAP_UART_WER_HAS_TX_WAKEUP (1 << 1) +#define OMAP_DMA_TX_KICK (1 << 2) +/* + * See Advisory 21 in AM437x errata SPRZ408B, updated April 2015. + * The same errata is applicable to AM335x and DRA7x processors too. + */ +#define UART_ERRATA_CLOCK_DISABLE (1 << 3) +#define UART_HAS_EFR2 BIT(4) +#define UART_HAS_RHR_IT_DIS BIT(5) +#define UART_RX_TIMEOUT_QUIRK BIT(6) + +#define OMAP_UART_FCR_RX_TRIG 6 +#define OMAP_UART_FCR_TX_TRIG 4 + +/* SCR register bitmasks */ +#define OMAP_UART_SCR_RX_TRIG_GRANU1_MASK (1 << 7) +#define OMAP_UART_SCR_TX_TRIG_GRANU1_MASK (1 << 6) +#define OMAP_UART_SCR_TX_EMPTY (1 << 3) +#define OMAP_UART_SCR_DMAMODE_MASK (3 << 1) +#define OMAP_UART_SCR_DMAMODE_1 (1 << 1) +#define OMAP_UART_SCR_DMAMODE_CTL (1 << 0) + +/* MVR register bitmasks */ +#define OMAP_UART_MVR_SCHEME_SHIFT 30 +#define OMAP_UART_LEGACY_MVR_MAJ_MASK 0xf0 +#define OMAP_UART_LEGACY_MVR_MAJ_SHIFT 4 +#define OMAP_UART_LEGACY_MVR_MIN_MASK 0x0f +#define OMAP_UART_MVR_MAJ_MASK 0x700 +#define OMAP_UART_MVR_MAJ_SHIFT 8 +#define OMAP_UART_MVR_MIN_MASK 0x3f + +/* SYSC register bitmasks */ +#define OMAP_UART_SYSC_SOFTRESET (1 << 1) + +/* SYSS register bitmasks */ +#define OMAP_UART_SYSS_RESETDONE (1 << 0) + +#define UART_TI752_TLR_TX 0 +#define UART_TI752_TLR_RX 4 + +#define TRIGGER_TLR_MASK(x) ((x & 0x3c) >> 2) +#define TRIGGER_FCR_MASK(x) (x & 3) + +/* Enable XON/XOFF flow control on output */ +#define OMAP_UART_SW_TX 0x08 +/* Enable XON/XOFF flow control on input */ +#define OMAP_UART_SW_RX 0x02 + +#define OMAP_UART_WER_MOD_WKUP 0x7f +#define OMAP_UART_TX_WAKEUP_EN (1 << 7) + +#define TX_TRIGGER 1 +#define RX_TRIGGER 48 + +#define OMAP_UART_TCR_RESTORE(x) ((x / 4) << 4) +#define OMAP_UART_TCR_HALT(x) ((x / 4) << 0) + +#define UART_BUILD_REVISION(x, y) (((x) << 8) | (y)) + +#define OMAP_UART_REV_46 0x0406 +#define OMAP_UART_REV_52 0x0502 +#define OMAP_UART_REV_63 0x0603 + +/* Interrupt Enable Register 2 */ +#define UART_OMAP_IER2 0x1B +#define UART_OMAP_IER2_RHR_IT_DIS BIT(2) + +/* Enhanced features register 2 */ +#define UART_OMAP_EFR2 0x23 +#define UART_OMAP_EFR2_TIMEOUT_BEHAVE BIT(6) + +/* RX FIFO occupancy indicator */ +#define UART_OMAP_RX_LVL 0x19 + +struct omap8250_priv { + void __iomem *membase; + int line; + u8 habit; + u8 mdr1; + u8 efr; + u8 scr; + u8 wer; + u8 xon; + u8 xoff; + u8 delayed_restore; + u16 quot; + + u8 tx_trigger; + u8 rx_trigger; + bool is_suspending; + int wakeirq; + int wakeups_enabled; + u32 latency; + u32 calc_latency; + struct pm_qos_request pm_qos_request; + struct work_struct qos_work; + struct uart_8250_dma omap8250_dma; + spinlock_t rx_dma_lock; + bool rx_dma_broken; + bool throttled; +}; + +struct omap8250_dma_params { + u32 rx_size; + u8 rx_trigger; + u8 tx_trigger; +}; + +struct omap8250_platdata { + struct omap8250_dma_params *dma_params; + u8 habit; +}; + +#ifdef CONFIG_SERIAL_8250_DMA +static void omap_8250_rx_dma_flush(struct uart_8250_port *p); +#else +static inline void omap_8250_rx_dma_flush(struct uart_8250_port *p) { } +#endif + +static u32 uart_read(struct omap8250_priv *priv, u32 reg) +{ + return readl(priv->membase + (reg << OMAP_UART_REGSHIFT)); +} + +static void uart_write(struct omap8250_priv *priv, u32 reg, u32 val) +{ + writel(val, priv->membase + (reg << OMAP_UART_REGSHIFT)); +} + +/* + * Called on runtime PM resume path from omap8250_restore_regs(), and + * omap8250_set_mctrl(). + */ +static void __omap8250_set_mctrl(struct uart_port *port, unsigned int mctrl) +{ + struct uart_8250_port *up = up_to_u8250p(port); + struct omap8250_priv *priv = up->port.private_data; + u8 lcr; + + serial8250_do_set_mctrl(port, mctrl); + + if (!mctrl_gpio_to_gpiod(up->gpios, UART_GPIO_RTS)) { + /* + * Turn off autoRTS if RTS is lowered and restore autoRTS + * setting if RTS is raised + */ + lcr = serial_in(up, UART_LCR); + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); + if ((mctrl & TIOCM_RTS) && (port->status & UPSTAT_AUTORTS)) + priv->efr |= UART_EFR_RTS; + else + priv->efr &= ~UART_EFR_RTS; + serial_out(up, UART_EFR, priv->efr); + serial_out(up, UART_LCR, lcr); + } +} + +static void omap8250_set_mctrl(struct uart_port *port, unsigned int mctrl) +{ + int err; + + err = pm_runtime_resume_and_get(port->dev); + if (err) + return; + + __omap8250_set_mctrl(port, mctrl); + + pm_runtime_mark_last_busy(port->dev); + pm_runtime_put_autosuspend(port->dev); +} + +/* + * Work Around for Errata i202 (2430, 3430, 3630, 4430 and 4460) + * The access to uart register after MDR1 Access + * causes UART to corrupt data. + * + * Need a delay = + * 5 L4 clock cycles + 5 UART functional clock cycle (@48MHz = ~0.2uS) + * give 10 times as much + */ +static void omap_8250_mdr1_errataset(struct uart_8250_port *up, + struct omap8250_priv *priv) +{ + serial_out(up, UART_OMAP_MDR1, priv->mdr1); + udelay(2); + serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_XMIT | + UART_FCR_CLEAR_RCVR); +} + +static void omap_8250_get_divisor(struct uart_port *port, unsigned int baud, + struct omap8250_priv *priv) +{ + unsigned int uartclk = port->uartclk; + unsigned int div_13, div_16; + unsigned int abs_d13, abs_d16; + + /* + * Old custom speed handling. + */ + if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) { + priv->quot = port->custom_divisor & UART_DIV_MAX; + /* + * I assume that nobody is using this. But hey, if somebody + * would like to specify the divisor _and_ the mode then the + * driver is ready and waiting for it. + */ + if (port->custom_divisor & (1 << 16)) + priv->mdr1 = UART_OMAP_MDR1_13X_MODE; + else + priv->mdr1 = UART_OMAP_MDR1_16X_MODE; + return; + } + div_13 = DIV_ROUND_CLOSEST(uartclk, 13 * baud); + div_16 = DIV_ROUND_CLOSEST(uartclk, 16 * baud); + + if (!div_13) + div_13 = 1; + if (!div_16) + div_16 = 1; + + abs_d13 = abs(baud - uartclk / 13 / div_13); + abs_d16 = abs(baud - uartclk / 16 / div_16); + + if (abs_d13 >= abs_d16) { + priv->mdr1 = UART_OMAP_MDR1_16X_MODE; + priv->quot = div_16; + } else { + priv->mdr1 = UART_OMAP_MDR1_13X_MODE; + priv->quot = div_13; + } +} + +static void omap8250_update_scr(struct uart_8250_port *up, + struct omap8250_priv *priv) +{ + u8 old_scr; + + old_scr = serial_in(up, UART_OMAP_SCR); + if (old_scr == priv->scr) + return; + + /* + * The manual recommends not to enable the DMA mode selector in the SCR + * (instead of the FCR) register _and_ selecting the DMA mode as one + * register write because this may lead to malfunction. + */ + if (priv->scr & OMAP_UART_SCR_DMAMODE_MASK) + serial_out(up, UART_OMAP_SCR, + priv->scr & ~OMAP_UART_SCR_DMAMODE_MASK); + serial_out(up, UART_OMAP_SCR, priv->scr); +} + +static void omap8250_update_mdr1(struct uart_8250_port *up, + struct omap8250_priv *priv) +{ + if (priv->habit & UART_ERRATA_i202_MDR1_ACCESS) + omap_8250_mdr1_errataset(up, priv); + else + serial_out(up, UART_OMAP_MDR1, priv->mdr1); +} + +static void omap8250_restore_regs(struct uart_8250_port *up) +{ + struct omap8250_priv *priv = up->port.private_data; + struct uart_8250_dma *dma = up->dma; + u8 mcr = serial8250_in_MCR(up); + + if (dma && dma->tx_running) { + /* + * TCSANOW requests the change to occur immediately however if + * we have a TX-DMA operation in progress then it has been + * observed that it might stall and never complete. Therefore we + * delay DMA completes to prevent this hang from happen. + */ + priv->delayed_restore = 1; + return; + } + + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); + serial_out(up, UART_EFR, UART_EFR_ECB); + + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); + serial8250_out_MCR(up, mcr | UART_MCR_TCRTLR); + serial_out(up, UART_FCR, up->fcr); + + omap8250_update_scr(up, priv); + + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); + + serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_RESTORE(16) | + OMAP_UART_TCR_HALT(52)); + serial_out(up, UART_TI752_TLR, + TRIGGER_TLR_MASK(priv->tx_trigger) << UART_TI752_TLR_TX | + TRIGGER_TLR_MASK(priv->rx_trigger) << UART_TI752_TLR_RX); + + serial_out(up, UART_LCR, 0); + + /* drop TCR + TLR access, we setup XON/XOFF later */ + serial8250_out_MCR(up, mcr); + + serial_out(up, UART_IER, up->ier); + + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); + serial_dl_write(up, priv->quot); + + serial_out(up, UART_EFR, priv->efr); + + /* Configure flow control */ + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); + serial_out(up, UART_XON1, priv->xon); + serial_out(up, UART_XOFF1, priv->xoff); + + serial_out(up, UART_LCR, up->lcr); + + omap8250_update_mdr1(up, priv); + + __omap8250_set_mctrl(&up->port, up->port.mctrl); + + if (up->port.rs485.flags & SER_RS485_ENABLED) + serial8250_em485_stop_tx(up); +} + +/* + * OMAP can use "CLK / (16 or 13) / div" for baud rate. And then we have have + * some differences in how we want to handle flow control. + */ +static void omap_8250_set_termios(struct uart_port *port, + struct ktermios *termios, + struct ktermios *old) +{ + struct uart_8250_port *up = up_to_u8250p(port); + struct omap8250_priv *priv = up->port.private_data; + unsigned char cval = 0; + unsigned int baud; + + switch (termios->c_cflag & CSIZE) { + case CS5: + cval = UART_LCR_WLEN5; + break; + case CS6: + cval = UART_LCR_WLEN6; + break; + case CS7: + cval = UART_LCR_WLEN7; + break; + default: + case CS8: + cval = UART_LCR_WLEN8; + break; + } + + if (termios->c_cflag & CSTOPB) + cval |= UART_LCR_STOP; + if (termios->c_cflag & PARENB) + cval |= UART_LCR_PARITY; + if (!(termios->c_cflag & PARODD)) + cval |= UART_LCR_EPAR; + if (termios->c_cflag & CMSPAR) + cval |= UART_LCR_SPAR; + + /* + * Ask the core to calculate the divisor for us. + */ + baud = uart_get_baud_rate(port, termios, old, + port->uartclk / 16 / UART_DIV_MAX, + port->uartclk / 13); + omap_8250_get_divisor(port, baud, priv); + + /* + * Ok, we're now changing the port state. Do it with + * interrupts disabled. + */ + pm_runtime_get_sync(port->dev); + spin_lock_irq(&port->lock); + + /* + * Update the per-port timeout. + */ + uart_update_timeout(port, termios->c_cflag, baud); + + up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; + if (termios->c_iflag & INPCK) + up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE; + if (termios->c_iflag & (IGNBRK | PARMRK)) + up->port.read_status_mask |= UART_LSR_BI; + + /* + * Characters to ignore + */ + up->port.ignore_status_mask = 0; + if (termios->c_iflag & IGNPAR) + up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; + if (termios->c_iflag & IGNBRK) { + up->port.ignore_status_mask |= UART_LSR_BI; + /* + * If we're ignoring parity and break indicators, + * ignore overruns too (for real raw support). + */ + if (termios->c_iflag & IGNPAR) + up->port.ignore_status_mask |= UART_LSR_OE; + } + + /* + * ignore all characters if CREAD is not set + */ + if ((termios->c_cflag & CREAD) == 0) + up->port.ignore_status_mask |= UART_LSR_DR; + + /* + * Modem status interrupts + */ + up->ier &= ~UART_IER_MSI; + if (UART_ENABLE_MS(&up->port, termios->c_cflag)) + up->ier |= UART_IER_MSI; + + up->lcr = cval; + /* Up to here it was mostly serial8250_do_set_termios() */ + + /* + * We enable TRIG_GRANU for RX and TX and additionally we set + * SCR_TX_EMPTY bit. The result is the following: + * - RX_TRIGGER amount of bytes in the FIFO will cause an interrupt. + * - less than RX_TRIGGER number of bytes will also cause an interrupt + * once the UART decides that there no new bytes arriving. + * - Once THRE is enabled, the interrupt will be fired once the FIFO is + * empty - the trigger level is ignored here. + * + * Once DMA is enabled: + * - UART will assert the TX DMA line once there is room for TX_TRIGGER + * bytes in the TX FIFO. On each assert the DMA engine will move + * TX_TRIGGER bytes into the FIFO. + * - UART will assert the RX DMA line once there are RX_TRIGGER bytes in + * the FIFO and move RX_TRIGGER bytes. + * This is because threshold and trigger values are the same. + */ + up->fcr = UART_FCR_ENABLE_FIFO; + up->fcr |= TRIGGER_FCR_MASK(priv->tx_trigger) << OMAP_UART_FCR_TX_TRIG; + up->fcr |= TRIGGER_FCR_MASK(priv->rx_trigger) << OMAP_UART_FCR_RX_TRIG; + + priv->scr = OMAP_UART_SCR_RX_TRIG_GRANU1_MASK | OMAP_UART_SCR_TX_EMPTY | + OMAP_UART_SCR_TX_TRIG_GRANU1_MASK; + + if (up->dma) + priv->scr |= OMAP_UART_SCR_DMAMODE_1 | + OMAP_UART_SCR_DMAMODE_CTL; + + priv->xon = termios->c_cc[VSTART]; + priv->xoff = termios->c_cc[VSTOP]; + + priv->efr = 0; + up->port.status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS | UPSTAT_AUTOXOFF); + + if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW && + !mctrl_gpio_to_gpiod(up->gpios, UART_GPIO_RTS) && + !mctrl_gpio_to_gpiod(up->gpios, UART_GPIO_CTS)) { + /* Enable AUTOCTS (autoRTS is enabled when RTS is raised) */ + up->port.status |= UPSTAT_AUTOCTS | UPSTAT_AUTORTS; + priv->efr |= UART_EFR_CTS; + } else if (up->port.flags & UPF_SOFT_FLOW) { + /* + * OMAP rx s/w flow control is borked; the transmitter remains + * stuck off even if rx flow control is subsequently disabled + */ + + /* + * IXOFF Flag: + * Enable XON/XOFF flow control on output. + * Transmit XON1, XOFF1 + */ + if (termios->c_iflag & IXOFF) { + up->port.status |= UPSTAT_AUTOXOFF; + priv->efr |= OMAP_UART_SW_TX; + } + } + omap8250_restore_regs(up); + + spin_unlock_irq(&up->port.lock); + pm_runtime_mark_last_busy(port->dev); + pm_runtime_put_autosuspend(port->dev); + + /* calculate wakeup latency constraint */ + priv->calc_latency = USEC_PER_SEC * 64 * 8 / baud; + priv->latency = priv->calc_latency; + + schedule_work(&priv->qos_work); + + /* Don't rewrite B0 */ + if (tty_termios_baud_rate(termios)) + tty_termios_encode_baud_rate(termios, baud, baud); +} + +/* same as 8250 except that we may have extra flow bits set in EFR */ +static void omap_8250_pm(struct uart_port *port, unsigned int state, + unsigned int oldstate) +{ + struct uart_8250_port *up = up_to_u8250p(port); + u8 efr; + + pm_runtime_get_sync(port->dev); + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); + efr = serial_in(up, UART_EFR); + serial_out(up, UART_EFR, efr | UART_EFR_ECB); + serial_out(up, UART_LCR, 0); + + serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0); + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); + serial_out(up, UART_EFR, efr); + serial_out(up, UART_LCR, 0); + + pm_runtime_mark_last_busy(port->dev); + pm_runtime_put_autosuspend(port->dev); +} + +static void omap_serial_fill_features_erratas(struct uart_8250_port *up, + struct omap8250_priv *priv) +{ + const struct soc_device_attribute k3_soc_devices[] = { + { .family = "AM65X", }, + { .family = "J721E", .revision = "SR1.0" }, + { /* sentinel */ } + }; + u32 mvr, scheme; + u16 revision, major, minor; + + mvr = uart_read(priv, UART_OMAP_MVER); + + /* Check revision register scheme */ + scheme = mvr >> OMAP_UART_MVR_SCHEME_SHIFT; + + switch (scheme) { + case 0: /* Legacy Scheme: OMAP2/3 */ + /* MINOR_REV[0:4], MAJOR_REV[4:7] */ + major = (mvr & OMAP_UART_LEGACY_MVR_MAJ_MASK) >> + OMAP_UART_LEGACY_MVR_MAJ_SHIFT; + minor = (mvr & OMAP_UART_LEGACY_MVR_MIN_MASK); + break; + case 1: + /* New Scheme: OMAP4+ */ + /* MINOR_REV[0:5], MAJOR_REV[8:10] */ + major = (mvr & OMAP_UART_MVR_MAJ_MASK) >> + OMAP_UART_MVR_MAJ_SHIFT; + minor = (mvr & OMAP_UART_MVR_MIN_MASK); + break; + default: + dev_warn(up->port.dev, + "Unknown revision, defaulting to highest\n"); + /* highest possible revision */ + major = 0xff; + minor = 0xff; + } + /* normalize revision for the driver */ + revision = UART_BUILD_REVISION(major, minor); + + switch (revision) { + case OMAP_UART_REV_46: + priv->habit |= UART_ERRATA_i202_MDR1_ACCESS; + break; + case OMAP_UART_REV_52: + priv->habit |= UART_ERRATA_i202_MDR1_ACCESS | + OMAP_UART_WER_HAS_TX_WAKEUP; + break; + case OMAP_UART_REV_63: + priv->habit |= UART_ERRATA_i202_MDR1_ACCESS | + OMAP_UART_WER_HAS_TX_WAKEUP; + break; + default: + break; + } + + /* + * AM65x SR1.0, AM65x SR2.0 and J721e SR1.0 don't + * don't have RHR_IT_DIS bit in IER2 register. So drop to flag + * to enable errata workaround. + */ + if (soc_device_match(k3_soc_devices)) + priv->habit &= ~UART_HAS_RHR_IT_DIS; +} + +static void omap8250_uart_qos_work(struct work_struct *work) +{ + struct omap8250_priv *priv; + + priv = container_of(work, struct omap8250_priv, qos_work); + cpu_latency_qos_update_request(&priv->pm_qos_request, priv->latency); +} + +#ifdef CONFIG_SERIAL_8250_DMA +static int omap_8250_dma_handle_irq(struct uart_port *port); +#endif + +static irqreturn_t omap8250_irq(int irq, void *dev_id) +{ + struct uart_port *port = dev_id; + struct omap8250_priv *priv = port->private_data; + struct uart_8250_port *up = up_to_u8250p(port); + unsigned int iir, lsr; + int ret; + +#ifdef CONFIG_SERIAL_8250_DMA + if (up->dma) { + ret = omap_8250_dma_handle_irq(port); + return IRQ_RETVAL(ret); + } +#endif + + serial8250_rpm_get(up); + lsr = serial_port_in(port, UART_LSR); + iir = serial_port_in(port, UART_IIR); + ret = serial8250_handle_irq(port, iir); + + /* + * On K3 SoCs, it is observed that RX TIMEOUT is signalled after + * FIFO has been drained, in which case a dummy read of RX FIFO + * is required to clear RX TIMEOUT condition. + */ + if (priv->habit & UART_RX_TIMEOUT_QUIRK && + (iir & UART_IIR_RX_TIMEOUT) == UART_IIR_RX_TIMEOUT && + serial_port_in(port, UART_OMAP_RX_LVL) == 0) { + serial_port_in(port, UART_RX); + } + + /* Stop processing interrupts on input overrun */ + if ((lsr & UART_LSR_OE) && up->overrun_backoff_time_ms > 0) { + unsigned long delay; + + /* Synchronize UART_IER access against the console. */ + spin_lock(&port->lock); + up->ier = port->serial_in(port, UART_IER); + if (up->ier & (UART_IER_RLSI | UART_IER_RDI)) { + port->ops->stop_rx(port); + } else { + /* Keep restarting the timer until + * the input overrun subsides. + */ + cancel_delayed_work(&up->overrun_backoff); + } + spin_unlock(&port->lock); + + delay = msecs_to_jiffies(up->overrun_backoff_time_ms); + schedule_delayed_work(&up->overrun_backoff, delay); + } + + serial8250_rpm_put(up); + + return IRQ_RETVAL(ret); +} + +static int omap_8250_startup(struct uart_port *port) +{ + struct uart_8250_port *up = up_to_u8250p(port); + struct omap8250_priv *priv = port->private_data; + int ret; + + if (priv->wakeirq) { + ret = dev_pm_set_dedicated_wake_irq(port->dev, priv->wakeirq); + if (ret) + return ret; + } + + pm_runtime_get_sync(port->dev); + + serial_out(up, UART_FCR, UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); + + serial_out(up, UART_LCR, UART_LCR_WLEN8); + + up->lsr_saved_flags = 0; + up->msr_saved_flags = 0; + + /* Disable DMA for console UART */ + if (uart_console(port)) + up->dma = NULL; + + if (up->dma) { + ret = serial8250_request_dma(up); + if (ret) { + dev_warn_ratelimited(port->dev, + "failed to request DMA\n"); + up->dma = NULL; + } + } + + ret = request_irq(port->irq, omap8250_irq, IRQF_SHARED, + dev_name(port->dev), port); + if (ret < 0) + goto err; + + up->ier = UART_IER_RLSI | UART_IER_RDI; + serial_out(up, UART_IER, up->ier); + +#ifdef CONFIG_PM + up->capabilities |= UART_CAP_RPM; +#endif + + /* Enable module level wake up */ + priv->wer = OMAP_UART_WER_MOD_WKUP; + if (priv->habit & OMAP_UART_WER_HAS_TX_WAKEUP) + priv->wer |= OMAP_UART_TX_WAKEUP_EN; + serial_out(up, UART_OMAP_WER, priv->wer); + + if (up->dma && !(priv->habit & UART_HAS_EFR2)) + up->dma->rx_dma(up); + + pm_runtime_mark_last_busy(port->dev); + pm_runtime_put_autosuspend(port->dev); + return 0; +err: + pm_runtime_mark_last_busy(port->dev); + pm_runtime_put_autosuspend(port->dev); + dev_pm_clear_wake_irq(port->dev); + return ret; +} + +static void omap_8250_shutdown(struct uart_port *port) +{ + struct uart_8250_port *up = up_to_u8250p(port); + struct omap8250_priv *priv = port->private_data; + + flush_work(&priv->qos_work); + if (up->dma) + omap_8250_rx_dma_flush(up); + + pm_runtime_get_sync(port->dev); + + serial_out(up, UART_OMAP_WER, 0); + if (priv->habit & UART_HAS_EFR2) + serial_out(up, UART_OMAP_EFR2, 0x0); + + up->ier = 0; + serial_out(up, UART_IER, 0); + + if (up->dma) + serial8250_release_dma(up); + + /* + * Disable break condition and FIFOs + */ + if (up->lcr & UART_LCR_SBC) + serial_out(up, UART_LCR, up->lcr & ~UART_LCR_SBC); + serial_out(up, UART_FCR, UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); + + pm_runtime_mark_last_busy(port->dev); + pm_runtime_put_autosuspend(port->dev); + free_irq(port->irq, port); + dev_pm_clear_wake_irq(port->dev); +} + +static void omap_8250_throttle(struct uart_port *port) +{ + struct omap8250_priv *priv = port->private_data; + unsigned long flags; + + pm_runtime_get_sync(port->dev); + + spin_lock_irqsave(&port->lock, flags); + port->ops->stop_rx(port); + priv->throttled = true; + spin_unlock_irqrestore(&port->lock, flags); + + pm_runtime_mark_last_busy(port->dev); + pm_runtime_put_autosuspend(port->dev); +} + +static void omap_8250_unthrottle(struct uart_port *port) +{ + struct omap8250_priv *priv = port->private_data; + struct uart_8250_port *up = up_to_u8250p(port); + unsigned long flags; + + pm_runtime_get_sync(port->dev); + + spin_lock_irqsave(&port->lock, flags); + priv->throttled = false; + if (up->dma) + up->dma->rx_dma(up); + up->ier |= UART_IER_RLSI | UART_IER_RDI; + port->read_status_mask |= UART_LSR_DR; + serial_out(up, UART_IER, up->ier); + spin_unlock_irqrestore(&port->lock, flags); + + pm_runtime_mark_last_busy(port->dev); + pm_runtime_put_autosuspend(port->dev); +} + +#ifdef CONFIG_SERIAL_8250_DMA +static int omap_8250_rx_dma(struct uart_8250_port *p); + +/* Must be called while priv->rx_dma_lock is held */ +static void __dma_rx_do_complete(struct uart_8250_port *p) +{ + struct uart_8250_dma *dma = p->dma; + struct tty_port *tty_port = &p->port.state->port; + struct omap8250_priv *priv = p->port.private_data; + struct dma_chan *rxchan = dma->rxchan; + dma_cookie_t cookie; + struct dma_tx_state state; + int count; + int ret; + u32 reg; + + if (!dma->rx_running) + goto out; + + cookie = dma->rx_cookie; + dma->rx_running = 0; + + /* Re-enable RX FIFO interrupt now that transfer is complete */ + if (priv->habit & UART_HAS_RHR_IT_DIS) { + reg = serial_in(p, UART_OMAP_IER2); + reg &= ~UART_OMAP_IER2_RHR_IT_DIS; + serial_out(p, UART_OMAP_IER2, reg); + } + + dmaengine_tx_status(rxchan, cookie, &state); + + count = dma->rx_size - state.residue + state.in_flight_bytes; + if (count < dma->rx_size) { + dmaengine_terminate_async(rxchan); + + /* + * Poll for teardown to complete which guarantees in + * flight data is drained. + */ + if (state.in_flight_bytes) { + int poll_count = 25; + + while (dmaengine_tx_status(rxchan, cookie, NULL) && + poll_count--) + cpu_relax(); + + if (poll_count == -1) + dev_err(p->port.dev, "teardown incomplete\n"); + } + } + if (!count) + goto out; + ret = tty_insert_flip_string(tty_port, dma->rx_buf, count); + + p->port.icount.rx += ret; + p->port.icount.buf_overrun += count - ret; +out: + + tty_flip_buffer_push(tty_port); +} + +static void __dma_rx_complete(void *param) +{ + struct uart_8250_port *p = param; + struct omap8250_priv *priv = p->port.private_data; + struct uart_8250_dma *dma = p->dma; + struct dma_tx_state state; + unsigned long flags; + + spin_lock_irqsave(&p->port.lock, flags); + + /* + * If the tx status is not DMA_COMPLETE, then this is a delayed + * completion callback. A previous RX timeout flush would have + * already pushed the data, so exit. + */ + if (dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state) != + DMA_COMPLETE) { + spin_unlock_irqrestore(&p->port.lock, flags); + return; + } + __dma_rx_do_complete(p); + if (!priv->throttled) { + p->ier |= UART_IER_RLSI | UART_IER_RDI; + serial_out(p, UART_IER, p->ier); + if (!(priv->habit & UART_HAS_EFR2)) + omap_8250_rx_dma(p); + } + + spin_unlock_irqrestore(&p->port.lock, flags); +} + +static void omap_8250_rx_dma_flush(struct uart_8250_port *p) +{ + struct omap8250_priv *priv = p->port.private_data; + struct uart_8250_dma *dma = p->dma; + struct dma_tx_state state; + unsigned long flags; + int ret; + + spin_lock_irqsave(&priv->rx_dma_lock, flags); + + if (!dma->rx_running) { + spin_unlock_irqrestore(&priv->rx_dma_lock, flags); + return; + } + + ret = dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state); + if (ret == DMA_IN_PROGRESS) { + ret = dmaengine_pause(dma->rxchan); + if (WARN_ON_ONCE(ret)) + priv->rx_dma_broken = true; + } + __dma_rx_do_complete(p); + spin_unlock_irqrestore(&priv->rx_dma_lock, flags); +} + +static int omap_8250_rx_dma(struct uart_8250_port *p) +{ + struct omap8250_priv *priv = p->port.private_data; + struct uart_8250_dma *dma = p->dma; + int err = 0; + struct dma_async_tx_descriptor *desc; + unsigned long flags; + u32 reg; + + if (priv->rx_dma_broken) + return -EINVAL; + + spin_lock_irqsave(&priv->rx_dma_lock, flags); + + if (dma->rx_running) { + enum dma_status state; + + state = dmaengine_tx_status(dma->rxchan, dma->rx_cookie, NULL); + if (state == DMA_COMPLETE) { + /* + * Disable RX interrupts to allow RX DMA completion + * callback to run. + */ + p->ier &= ~(UART_IER_RLSI | UART_IER_RDI); + serial_out(p, UART_IER, p->ier); + } + goto out; + } + + desc = dmaengine_prep_slave_single(dma->rxchan, dma->rx_addr, + dma->rx_size, DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!desc) { + err = -EBUSY; + goto out; + } + + dma->rx_running = 1; + desc->callback = __dma_rx_complete; + desc->callback_param = p; + + dma->rx_cookie = dmaengine_submit(desc); + + /* + * Disable RX FIFO interrupt while RX DMA is enabled, else + * spurious interrupt may be raised when data is in the RX FIFO + * but is yet to be drained by DMA. + */ + if (priv->habit & UART_HAS_RHR_IT_DIS) { + reg = serial_in(p, UART_OMAP_IER2); + reg |= UART_OMAP_IER2_RHR_IT_DIS; + serial_out(p, UART_OMAP_IER2, reg); + } + + dma_async_issue_pending(dma->rxchan); +out: + spin_unlock_irqrestore(&priv->rx_dma_lock, flags); + return err; +} + +static int omap_8250_tx_dma(struct uart_8250_port *p); + +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; + unsigned long flags; + bool en_thri = false; + struct omap8250_priv *priv = p->port.private_data; + + dma_sync_single_for_cpu(dma->txchan->device->dev, dma->tx_addr, + UART_XMIT_SIZE, DMA_TO_DEVICE); + + spin_lock_irqsave(&p->port.lock, flags); + + dma->tx_running = 0; + + xmit->tail += dma->tx_size; + xmit->tail &= UART_XMIT_SIZE - 1; + p->port.icount.tx += dma->tx_size; + + if (priv->delayed_restore) { + priv->delayed_restore = 0; + omap8250_restore_regs(p); + } + + if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + uart_write_wakeup(&p->port); + + if (!uart_circ_empty(xmit) && !uart_tx_stopped(&p->port)) { + int ret; + + ret = omap_8250_tx_dma(p); + if (ret) + en_thri = true; + } else if (p->capabilities & UART_CAP_RPM) { + en_thri = true; + } + + if (en_thri) { + dma->tx_err = 1; + serial8250_set_THRI(p); + } + + spin_unlock_irqrestore(&p->port.lock, flags); +} + +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 dma_async_tx_descriptor *desc; + unsigned int skip_byte = 0; + int ret; + + if (dma->tx_running) + return 0; + if (uart_tx_stopped(&p->port) || uart_circ_empty(xmit)) { + + /* + * Even if no data, we need to return an error for the two cases + * below so serial8250_tx_chars() is invoked and properly clears + * THRI and/or runtime suspend. + */ + if (dma->tx_err || p->capabilities & UART_CAP_RPM) { + ret = -EBUSY; + goto err; + } + serial8250_clear_THRI(p); + return 0; + } + + dma->tx_size = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); + if (priv->habit & OMAP_DMA_TX_KICK) { + u8 tx_lvl; + + /* + * We need to put the first byte into the FIFO in order to start + * the DMA transfer. For transfers smaller than four bytes we + * don't bother doing DMA at all. It seem not matter if there + * are still bytes in the FIFO from the last transfer (in case + * we got here directly from omap_8250_dma_tx_complete()). Bytes + * leaving the FIFO seem not to trigger the DMA transfer. It is + * really the byte that we put into the FIFO. + * If the FIFO is already full then we most likely got here from + * omap_8250_dma_tx_complete(). And this means the DMA engine + * just completed its work. We don't have to wait the complete + * 86us at 115200,8n1 but around 60us (not to mention lower + * baudrates). So in that case we take the interrupt and try + * again with an empty FIFO. + */ + tx_lvl = serial_in(p, UART_OMAP_TX_LVL); + if (tx_lvl == p->tx_loadsz) { + ret = -EBUSY; + goto err; + } + if (dma->tx_size < 4) { + ret = -EINVAL; + goto err; + } + skip_byte = 1; + } + + desc = dmaengine_prep_slave_single(dma->txchan, + dma->tx_addr + xmit->tail + skip_byte, + dma->tx_size - skip_byte, DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!desc) { + ret = -EBUSY; + goto err; + } + + dma->tx_running = 1; + + desc->callback = omap_8250_dma_tx_complete; + desc->callback_param = p; + + dma->tx_cookie = dmaengine_submit(desc); + + dma_sync_single_for_device(dma->txchan->device->dev, dma->tx_addr, + UART_XMIT_SIZE, DMA_TO_DEVICE); + + dma_async_issue_pending(dma->txchan); + if (dma->tx_err) + dma->tx_err = 0; + + serial8250_clear_THRI(p); + if (skip_byte) + serial_out(p, UART_TX, xmit->buf[xmit->tail]); + return 0; +err: + dma->tx_err = 1; + return ret; +} + +static bool handle_rx_dma(struct uart_8250_port *up, unsigned int iir) +{ + switch (iir & 0x3f) { + case UART_IIR_RLSI: + case UART_IIR_RX_TIMEOUT: + case UART_IIR_RDI: + omap_8250_rx_dma_flush(up); + return true; + } + return omap_8250_rx_dma(up); +} + +static unsigned char omap_8250_handle_rx_dma(struct uart_8250_port *up, + u8 iir, unsigned char status) +{ + if ((status & (UART_LSR_DR | UART_LSR_BI)) && + (iir & UART_IIR_RDI)) { + if (handle_rx_dma(up, iir)) { + status = serial8250_rx_chars(up, status); + omap_8250_rx_dma(up); + } + } + + return status; +} + +static void am654_8250_handle_rx_dma(struct uart_8250_port *up, u8 iir, + unsigned char status) +{ + /* + * Queue a new transfer if FIFO has data. + */ + if ((status & (UART_LSR_DR | UART_LSR_BI)) && + (up->ier & UART_IER_RDI)) { + omap_8250_rx_dma(up); + serial_out(up, UART_OMAP_EFR2, UART_OMAP_EFR2_TIMEOUT_BEHAVE); + } else if ((iir & 0x3f) == UART_IIR_RX_TIMEOUT) { + /* + * Disable RX timeout, read IIR to clear + * current timeout condition, clear EFR2 to + * periodic timeouts, re-enable interrupts. + */ + up->ier &= ~(UART_IER_RLSI | UART_IER_RDI); + serial_out(up, UART_IER, up->ier); + omap_8250_rx_dma_flush(up); + serial_in(up, UART_IIR); + serial_out(up, UART_OMAP_EFR2, 0x0); + up->ier |= UART_IER_RLSI | UART_IER_RDI; + serial_out(up, UART_IER, up->ier); + } +} + +/* + * This is mostly serial8250_handle_irq(). We have a slightly different DMA + * hoook for RX/TX and need different logic for them in the ISR. Therefore we + * use the default routine in the non-DMA case and this one for with DMA. + */ +static int omap_8250_dma_handle_irq(struct uart_port *port) +{ + struct uart_8250_port *up = up_to_u8250p(port); + struct omap8250_priv *priv = up->port.private_data; + unsigned char status; + unsigned long flags; + u8 iir; + + serial8250_rpm_get(up); + + iir = serial_port_in(port, UART_IIR); + if (iir & UART_IIR_NO_INT) { + serial8250_rpm_put(up); + return IRQ_HANDLED; + } + + spin_lock_irqsave(&port->lock, flags); + + status = serial_port_in(port, UART_LSR); + + if ((iir & 0x3f) != UART_IIR_THRI) { + if (priv->habit & UART_HAS_EFR2) + am654_8250_handle_rx_dma(up, iir, status); + else + status = omap_8250_handle_rx_dma(up, iir, status); + } + + 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)) { + up->dma->tx_err = 0; + serial8250_tx_chars(up); + } else { + /* + * try again due to an earlier failer which + * might have been resolved by now. + */ + if (omap_8250_tx_dma(up)) + serial8250_tx_chars(up); + } + } + + uart_unlock_and_check_sysrq(port, flags); + serial8250_rpm_put(up); + return 1; +} + +static bool the_no_dma_filter_fn(struct dma_chan *chan, void *param) +{ + return false; +} + +#else + +static inline int omap_8250_rx_dma(struct uart_8250_port *p) +{ + return -EINVAL; +} +#endif + +static int omap8250_no_handle_irq(struct uart_port *port) +{ + /* IRQ has not been requested but handling irq? */ + WARN_ONCE(1, "Unexpected irq handling before port startup\n"); + return 0; +} + +static struct omap8250_dma_params am654_dma = { + .rx_size = SZ_2K, + .rx_trigger = 1, + .tx_trigger = TX_TRIGGER, +}; + +static struct omap8250_dma_params am33xx_dma = { + .rx_size = RX_TRIGGER, + .rx_trigger = RX_TRIGGER, + .tx_trigger = TX_TRIGGER, +}; + +static struct omap8250_platdata am654_platdata = { + .dma_params = &am654_dma, + .habit = UART_HAS_EFR2 | UART_HAS_RHR_IT_DIS | + UART_RX_TIMEOUT_QUIRK, +}; + +static struct omap8250_platdata am33xx_platdata = { + .dma_params = &am33xx_dma, + .habit = OMAP_DMA_TX_KICK | UART_ERRATA_CLOCK_DISABLE, +}; + +static struct omap8250_platdata omap4_platdata = { + .dma_params = &am33xx_dma, + .habit = UART_ERRATA_CLOCK_DISABLE, +}; + +static const struct of_device_id omap8250_dt_ids[] = { + { .compatible = "ti,am654-uart", .data = &am654_platdata, }, + { .compatible = "ti,omap2-uart" }, + { .compatible = "ti,omap3-uart" }, + { .compatible = "ti,omap4-uart", .data = &omap4_platdata, }, + { .compatible = "ti,am3352-uart", .data = &am33xx_platdata, }, + { .compatible = "ti,am4372-uart", .data = &am33xx_platdata, }, + { .compatible = "ti,dra742-uart", .data = &omap4_platdata, }, + {}, +}; +MODULE_DEVICE_TABLE(of, omap8250_dt_ids); + +static int omap8250_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct omap8250_priv *priv; + const struct omap8250_platdata *pdata; + struct uart_8250_port up; + struct resource *regs; + void __iomem *membase; + int irq, ret; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!regs) { + dev_err(&pdev->dev, "missing registers\n"); + return -EINVAL; + } + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + membase = devm_ioremap(&pdev->dev, regs->start, + resource_size(regs)); + if (!membase) + return -ENODEV; + + memset(&up, 0, sizeof(up)); + up.port.dev = &pdev->dev; + up.port.mapbase = regs->start; + up.port.membase = membase; + up.port.irq = irq; + /* + * It claims to be 16C750 compatible however it is a little different. + * It has EFR and has no FCR7_64byte bit. The AFE (which it claims to + * have) is enabled via EFR instead of MCR. The type is set here 8250 + * just to get things going. UNKNOWN does not work for a few reasons and + * we don't need our own type since we don't use 8250's set_termios() + * or pm callback. + */ + up.port.type = PORT_8250; + up.port.iotype = UPIO_MEM; + up.port.flags = UPF_FIXED_PORT | UPF_FIXED_TYPE | UPF_SOFT_FLOW | + UPF_HARD_FLOW; + up.port.private_data = priv; + + up.port.regshift = OMAP_UART_REGSHIFT; + up.port.fifosize = 64; + up.tx_loadsz = 64; + up.capabilities = UART_CAP_FIFO; +#ifdef CONFIG_PM + /* + * Runtime PM is mostly transparent. However to do it right we need to a + * TX empty interrupt before we can put the device to auto idle. So if + * PM is not enabled we don't add that flag and can spare that one extra + * interrupt in the TX path. + */ + up.capabilities |= UART_CAP_RPM; +#endif + up.port.set_termios = omap_8250_set_termios; + up.port.set_mctrl = omap8250_set_mctrl; + up.port.pm = omap_8250_pm; + up.port.startup = omap_8250_startup; + up.port.shutdown = omap_8250_shutdown; + up.port.throttle = omap_8250_throttle; + up.port.unthrottle = omap_8250_unthrottle; + up.port.rs485_config = serial8250_em485_config; + up.rs485_start_tx = serial8250_em485_start_tx; + up.rs485_stop_tx = serial8250_em485_stop_tx; + up.port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_8250_CONSOLE); + + ret = of_alias_get_id(np, "serial"); + if (ret < 0) { + dev_err(&pdev->dev, "failed to get alias\n"); + return ret; + } + up.port.line = ret; + + if (of_property_read_u32(np, "clock-frequency", &up.port.uartclk)) { + struct clk *clk; + + clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(clk)) { + if (PTR_ERR(clk) == -EPROBE_DEFER) + return -EPROBE_DEFER; + } else { + up.port.uartclk = clk_get_rate(clk); + } + } + + if (of_property_read_u32(np, "overrun-throttle-ms", + &up.overrun_backoff_time_ms) != 0) + up.overrun_backoff_time_ms = 0; + + priv->wakeirq = irq_of_parse_and_map(np, 1); + + pdata = of_device_get_match_data(&pdev->dev); + if (pdata) + priv->habit |= pdata->habit; + + if (!up.port.uartclk) { + up.port.uartclk = DEFAULT_CLK_SPEED; + dev_warn(&pdev->dev, + "No clock speed specified: using default: %d\n", + DEFAULT_CLK_SPEED); + } + + priv->membase = membase; + priv->line = -ENODEV; + priv->latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE; + priv->calc_latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE; + cpu_latency_qos_add_request(&priv->pm_qos_request, priv->latency); + INIT_WORK(&priv->qos_work, omap8250_uart_qos_work); + + spin_lock_init(&priv->rx_dma_lock); + + platform_set_drvdata(pdev, priv); + + device_init_wakeup(&pdev->dev, true); + pm_runtime_enable(&pdev->dev); + pm_runtime_use_autosuspend(&pdev->dev); + + /* + * Disable runtime PM until autosuspend delay unless specifically + * enabled by the user via sysfs. This is the historic way to + * prevent an unsafe default policy with lossy characters on wake-up. + * For serdev devices this is not needed, the policy can be managed by + * the serdev driver. + */ + if (!of_get_available_child_count(pdev->dev.of_node)) + pm_runtime_set_autosuspend_delay(&pdev->dev, -1); + + pm_runtime_irq_safe(&pdev->dev); + + pm_runtime_get_sync(&pdev->dev); + + omap_serial_fill_features_erratas(&up, priv); + up.port.handle_irq = omap8250_no_handle_irq; + priv->rx_trigger = RX_TRIGGER; + priv->tx_trigger = TX_TRIGGER; +#ifdef CONFIG_SERIAL_8250_DMA + /* + * Oh DMA support. If there are no DMA properties in the DT then + * we will fall back to a generic DMA channel which does not + * really work here. To ensure that we do not get a generic DMA + * channel assigned, we have the the_no_dma_filter_fn() here. + * To avoid "failed to request DMA" messages we check for DMA + * properties in DT. + */ + ret = of_property_count_strings(np, "dma-names"); + if (ret == 2) { + struct omap8250_dma_params *dma_params = NULL; + + up.dma = &priv->omap8250_dma; + up.dma->fn = the_no_dma_filter_fn; + up.dma->tx_dma = omap_8250_tx_dma; + up.dma->rx_dma = omap_8250_rx_dma; + if (pdata) + dma_params = pdata->dma_params; + + if (dma_params) { + up.dma->rx_size = dma_params->rx_size; + up.dma->rxconf.src_maxburst = dma_params->rx_trigger; + up.dma->txconf.dst_maxburst = dma_params->tx_trigger; + priv->rx_trigger = dma_params->rx_trigger; + priv->tx_trigger = dma_params->tx_trigger; + } else { + up.dma->rx_size = RX_TRIGGER; + up.dma->rxconf.src_maxburst = RX_TRIGGER; + up.dma->txconf.dst_maxburst = TX_TRIGGER; + } + } +#endif + ret = serial8250_register_8250_port(&up); + if (ret < 0) { + dev_err(&pdev->dev, "unable to register 8250 port\n"); + goto err; + } + priv->line = ret; + pm_runtime_mark_last_busy(&pdev->dev); + pm_runtime_put_autosuspend(&pdev->dev); + return 0; +err: + pm_runtime_dont_use_autosuspend(&pdev->dev); + pm_runtime_put_sync(&pdev->dev); + flush_work(&priv->qos_work); + pm_runtime_disable(&pdev->dev); + cpu_latency_qos_remove_request(&priv->pm_qos_request); + return ret; +} + +static int omap8250_remove(struct platform_device *pdev) +{ + struct omap8250_priv *priv = platform_get_drvdata(pdev); + int err; + + err = pm_runtime_resume_and_get(&pdev->dev); + if (err) + dev_err(&pdev->dev, "Failed to resume hardware\n"); + + serial8250_unregister_port(priv->line); + priv->line = -ENODEV; + pm_runtime_dont_use_autosuspend(&pdev->dev); + pm_runtime_put_sync(&pdev->dev); + flush_work(&priv->qos_work); + pm_runtime_disable(&pdev->dev); + cpu_latency_qos_remove_request(&priv->pm_qos_request); + device_init_wakeup(&pdev->dev, false); + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int omap8250_prepare(struct device *dev) +{ + struct omap8250_priv *priv = dev_get_drvdata(dev); + + if (!priv) + return 0; + priv->is_suspending = true; + return 0; +} + +static void omap8250_complete(struct device *dev) +{ + struct omap8250_priv *priv = dev_get_drvdata(dev); + + if (!priv) + return; + priv->is_suspending = false; +} + +static int omap8250_suspend(struct device *dev) +{ + struct omap8250_priv *priv = dev_get_drvdata(dev); + struct uart_8250_port *up = serial8250_get_port(priv->line); + int err = 0; + + serial8250_suspend_port(priv->line); + + err = pm_runtime_resume_and_get(dev); + if (err) + return err; + if (!device_may_wakeup(dev)) + priv->wer = 0; + serial_out(up, UART_OMAP_WER, priv->wer); + if (uart_console(&up->port) && console_suspend_enabled) + err = pm_runtime_force_suspend(dev); + flush_work(&priv->qos_work); + + return err; +} + +static int omap8250_resume(struct device *dev) +{ + struct omap8250_priv *priv = dev_get_drvdata(dev); + struct uart_8250_port *up = serial8250_get_port(priv->line); + int err; + + if (uart_console(&up->port) && console_suspend_enabled) { + err = pm_runtime_force_resume(dev); + if (err) + return err; + } + + serial8250_resume_port(priv->line); + /* Paired with pm_runtime_resume_and_get() in omap8250_suspend() */ + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); + + return 0; +} +#else +#define omap8250_prepare NULL +#define omap8250_complete NULL +#endif + +#ifdef CONFIG_PM +static int omap8250_lost_context(struct uart_8250_port *up) +{ + u32 val; + + val = serial_in(up, UART_OMAP_SCR); + /* + * If we lose context, then SCR is set to its reset value of zero. + * After set_termios() we set bit 3 of SCR (TX_EMPTY_CTL_IT) to 1, + * among other bits, to never set the register back to zero again. + */ + if (!val) + return 1; + return 0; +} + +/* TODO: in future, this should happen via API in drivers/reset/ */ +static int omap8250_soft_reset(struct device *dev) +{ + struct omap8250_priv *priv = dev_get_drvdata(dev); + int timeout = 100; + int sysc; + int syss; + + /* + * At least on omap4, unused uarts may not idle after reset without + * a basic scr dma configuration even with no dma in use. The + * module clkctrl status bits will be 1 instead of 3 blocking idle + * for the whole clockdomain. The softreset below will clear scr, + * and we restore it on resume so this is safe to do on all SoCs + * needing omap8250_soft_reset() quirk. Do it in two writes as + * recommended in the comment for omap8250_update_scr(). + */ + uart_write(priv, UART_OMAP_SCR, OMAP_UART_SCR_DMAMODE_1); + uart_write(priv, UART_OMAP_SCR, + OMAP_UART_SCR_DMAMODE_1 | OMAP_UART_SCR_DMAMODE_CTL); + + sysc = uart_read(priv, UART_OMAP_SYSC); + + /* softreset the UART */ + sysc |= OMAP_UART_SYSC_SOFTRESET; + uart_write(priv, UART_OMAP_SYSC, sysc); + + /* By experiments, 1us enough for reset complete on AM335x */ + do { + udelay(1); + syss = uart_read(priv, UART_OMAP_SYSS); + } while (--timeout && !(syss & OMAP_UART_SYSS_RESETDONE)); + + if (!timeout) { + dev_err(dev, "timed out waiting for reset done\n"); + return -ETIMEDOUT; + } + + return 0; +} + +static int omap8250_runtime_suspend(struct device *dev) +{ + struct omap8250_priv *priv = dev_get_drvdata(dev); + struct uart_8250_port *up = NULL; + + if (priv->line >= 0) + up = serial8250_get_port(priv->line); + + if (priv->habit & UART_ERRATA_CLOCK_DISABLE) { + int ret; + + ret = omap8250_soft_reset(dev); + if (ret) + return ret; + + if (up) { + /* Restore to UART mode after reset (for wakeup) */ + omap8250_update_mdr1(up, priv); + /* Restore wakeup enable register */ + serial_out(up, UART_OMAP_WER, priv->wer); + } + } + + if (up && up->dma && up->dma->rxchan) + omap_8250_rx_dma_flush(up); + + priv->latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE; + schedule_work(&priv->qos_work); + + return 0; +} + +static int omap8250_runtime_resume(struct device *dev) +{ + struct omap8250_priv *priv = dev_get_drvdata(dev); + struct uart_8250_port *up = NULL; + + if (priv->line >= 0) + up = serial8250_get_port(priv->line); + + if (up && omap8250_lost_context(up)) + omap8250_restore_regs(up); + + if (up && up->dma && up->dma->rxchan && !(priv->habit & UART_HAS_EFR2)) + omap_8250_rx_dma(up); + + priv->latency = priv->calc_latency; + schedule_work(&priv->qos_work); + return 0; +} +#endif + +#ifdef CONFIG_SERIAL_8250_OMAP_TTYO_FIXUP +static int __init omap8250_console_fixup(void) +{ + char *omap_str; + char *options; + u8 idx; + + if (strstr(boot_command_line, "console=ttyS")) + /* user set a ttyS based name for the console */ + return 0; + + omap_str = strstr(boot_command_line, "console=ttyO"); + if (!omap_str) + /* user did not set ttyO based console, so we don't care */ + return 0; + + omap_str += 12; + if ('0' <= *omap_str && *omap_str <= '9') + idx = *omap_str - '0'; + else + return 0; + + omap_str++; + if (omap_str[0] == ',') { + omap_str++; + options = omap_str; + } else { + options = NULL; + } + + add_preferred_console("ttyS", idx, options); + pr_err("WARNING: Your 'console=ttyO%d' has been replaced by 'ttyS%d'\n", + idx, idx); + pr_err("This ensures that you still see kernel messages. Please\n"); + pr_err("update your kernel commandline.\n"); + return 0; +} +console_initcall(omap8250_console_fixup); +#endif + +static const struct dev_pm_ops omap8250_dev_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(omap8250_suspend, omap8250_resume) + SET_RUNTIME_PM_OPS(omap8250_runtime_suspend, + omap8250_runtime_resume, NULL) + .prepare = omap8250_prepare, + .complete = omap8250_complete, +}; + +static struct platform_driver omap8250_platform_driver = { + .driver = { + .name = "omap8250", + .pm = &omap8250_dev_pm_ops, + .of_match_table = omap8250_dt_ids, + }, + .probe = omap8250_probe, + .remove = omap8250_remove, +}; +module_platform_driver(omap8250_platform_driver); + +MODULE_AUTHOR("Sebastian Andrzej Siewior"); +MODULE_DESCRIPTION("OMAP 8250 Driver"); +MODULE_LICENSE("GPL v2"); |