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linux-zen-server/drivers/tty/serial/8250/8250_omap.c

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Initial commit
2023-08-30 17:53:23 +02:00
// 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 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 UART_HAS_NATIVE_RS485 BIT(7)
#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)
/* Mode Definition Register 3 */
#define UART_OMAP_MDR3 0x20
#define UART_OMAP_MDR3_DIR_POL BIT(3)
#define UART_OMAP_MDR3_DIR_EN BIT(4)
/* 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 {
int line;
u8 habit;
u8 mdr1;
u8 mdr3;
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 uart_8250_port *up, u32 reg)
{
return readl(up->port.membase + (reg << up->port.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);
serial_out(up, UART_OMAP_MDR3, priv->mdr3);
if (up->port.rs485.flags & SER_RS485_ENABLED &&
up->port.rs485_config == serial8250_em485_config)
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,
const 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;
cval = UART_LCR_WLEN(tty_get_char_size(termios->c_cflag));
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)
{
static 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(up, 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;
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);
}
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);
}
static int omap8250_rs485_config(struct uart_port *port,
struct ktermios *termios,
struct serial_rs485 *rs485)
{
struct omap8250_priv *priv = port->private_data;
struct uart_8250_port *up = up_to_u8250p(port);
u32 fixed_delay_rts_before_send = 0;
u32 fixed_delay_rts_after_send = 0;
unsigned int baud;
/*
* There is a fixed delay of 3 bit clock cycles after the TX shift
* register is going empty to allow time for the stop bit to transition
* through the transceiver before direction is changed to receive.
*
* Additionally there appears to be a 1 bit clock delay between writing
* to the THR register and transmission of the start bit, per page 8783
* of the AM65 TRM: https://www.ti.com/lit/ug/spruid7e/spruid7e.pdf
*/
if (priv->quot) {
if (priv->mdr1 == UART_OMAP_MDR1_16X_MODE)
baud = port->uartclk / (16 * priv->quot);
else
baud = port->uartclk / (13 * priv->quot);
fixed_delay_rts_after_send = 3 * MSEC_PER_SEC / baud;
fixed_delay_rts_before_send = 1 * MSEC_PER_SEC / baud;
}
/*
* Fall back to RS485 software emulation if the UART is missing
* hardware support, if the device tree specifies an mctrl_gpio
* (indicates that RTS is unavailable due to a pinmux conflict)
* or if the requested delays exceed the fixed hardware delays.
*/
if (!(priv->habit & UART_HAS_NATIVE_RS485) ||
mctrl_gpio_to_gpiod(up->gpios, UART_GPIO_RTS) ||
rs485->delay_rts_after_send > fixed_delay_rts_after_send ||
rs485->delay_rts_before_send > fixed_delay_rts_before_send) {
priv->mdr3 &= ~UART_OMAP_MDR3_DIR_EN;
serial_out(up, UART_OMAP_MDR3, priv->mdr3);
port->rs485_config = serial8250_em485_config;
return serial8250_em485_config(port, termios, rs485);
}
rs485->delay_rts_after_send = fixed_delay_rts_after_send;
rs485->delay_rts_before_send = fixed_delay_rts_before_send;
if (rs485->flags & SER_RS485_ENABLED)
priv->mdr3 |= UART_OMAP_MDR3_DIR_EN;
else
priv->mdr3 &= ~UART_OMAP_MDR3_DIR_EN;
/*
* Retain same polarity semantics as RS485 software emulation,
* i.e. SER_RS485_RTS_ON_SEND means driving RTS low on send.
*/
if (rs485->flags & SER_RS485_RTS_ON_SEND)
priv->mdr3 &= ~UART_OMAP_MDR3_DIR_POL;
else
priv->mdr3 |= UART_OMAP_MDR3_DIR_POL;
serial_out(up, UART_OMAP_MDR3, priv->mdr3);
return 0;
}
#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, UART_OMAP_IER2_RHR_IT_DIS);
}
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, UART_OMAP_IER2_RHR_IT_DIS);
}
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;
uart_xmit_advance(&p->port, 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 u16 omap_8250_handle_rx_dma(struct uart_8250_port *up, u8 iir, u16 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,
u16 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;
u16 status;
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(&port->lock);
status = serial_port_in(port, UART_LSR);
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);
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 | UART_HAS_NATIVE_RS485,
};
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 = 2;
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 = omap8250_rs485_config;
/* same rs485_supported for software emulation and native RS485 */
up.port.rs485_supported = serial8250_em485_supported;
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->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);
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;
platform_set_drvdata(pdev, priv);
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);
pm_runtime_disable(&pdev->dev);
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)
return err;
pm_runtime_dont_use_autosuspend(&pdev->dev);
pm_runtime_put_sync(&pdev->dev);
flush_work(&priv->qos_work);
pm_runtime_disable(&pdev->dev);
serial8250_unregister_port(priv->line);
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);
serial8250_suspend_port(priv->line);
pm_runtime_get_sync(dev);
if (!device_may_wakeup(dev))
priv->wer = 0;
serial_out(up, UART_OMAP_WER, priv->wer);
pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
flush_work(&priv->qos_work);
return 0;
}
static int omap8250_resume(struct device *dev)
{
struct omap8250_priv *priv = dev_get_drvdata(dev);
serial8250_resume_port(priv->line);
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);
struct uart_8250_port *up = serial8250_get_port(priv->line);
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().
*/
serial_out(up, UART_OMAP_SCR, OMAP_UART_SCR_DMAMODE_1);
serial_out(up, UART_OMAP_SCR,
OMAP_UART_SCR_DMAMODE_1 | OMAP_UART_SCR_DMAMODE_CTL);
sysc = serial_in(up, UART_OMAP_SYSC);
/* softreset the UART */
sysc |= OMAP_UART_SYSC_SOFTRESET;
serial_out(up, UART_OMAP_SYSC, sysc);
/* By experiments, 1us enough for reset complete on AM335x */
do {
udelay(1);
syss = serial_in(up, 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;
/* In case runtime-pm tries this before we are setup */
if (!priv)
return 0;
up = serial8250_get_port(priv->line);
/*
* When using 'no_console_suspend', the console UART must not be
* suspended. Since driver suspend is managed by runtime suspend,
* preventing runtime suspend (by returning error) will keep device
* active during suspend.
*/
if (priv->is_suspending && !console_suspend_enabled) {
if (uart_console(&up->port))
return -EBUSY;
}
if (priv->habit & UART_ERRATA_CLOCK_DISABLE) {
int ret;
ret = omap8250_soft_reset(dev);
if (ret)
return ret;
/* 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->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;
/* In case runtime-pm tries this before we are setup */
if (!priv)
return 0;
up = serial8250_get_port(priv->line);
if (omap8250_lost_context(up))
omap8250_restore_regs(up);
if (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");