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linux/arch/arm/mach-omap2/serial.c

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/*
* arch/arm/mach-omap2/serial.c
*
* OMAP2 serial support.
*
* Copyright (C) 2005-2008 Nokia Corporation
* Author: Paul Mundt <paul.mundt@nokia.com>
*
* Major rework for PM support by Kevin Hilman
*
* Based off of arch/arm/mach-omap/omap1/serial.c
*
* Copyright (C) 2009 Texas Instruments
* Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/serial_reg.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/serial_8250.h>
#include <linux/pm_runtime.h>
#include <linux/console.h>
#ifdef CONFIG_SERIAL_OMAP
#include <plat/omap-serial.h>
#endif
#include <plat/common.h>
#include <plat/board.h>
#include <plat/clock.h>
#include <plat/dma.h>
#include <plat/omap_hwmod.h>
#include <plat/omap_device.h>
#include "prm.h"
#include "pm.h"
#include "cm.h"
#include "prm-regbits-34xx.h"
#include "control.h"
#define UART_OMAP_NO_EMPTY_FIFO_READ_IP_REV 0x52
#define UART_OMAP_WER 0x17 /* Wake-up enable register */
#define UART_ERRATA_FIFO_FULL_ABORT (0x1 << 0)
#define UART_ERRATA_i202_MDR1_ACCESS (0x1 << 1)
/*
* NOTE: By default the serial timeout is disabled as it causes lost characters
* over the serial ports. This means that the UART clocks will stay on until
* disabled via sysfs. This also causes that any deeper omap sleep states are
* blocked.
*/
#define DEFAULT_TIMEOUT 0
#define MAX_UART_HWMOD_NAME_LEN 16
struct omap_uart_state {
int num;
int can_sleep;
struct timer_list timer;
u32 timeout;
void __iomem *wk_st;
void __iomem *wk_en;
u32 wk_mask;
u32 padconf;
u32 dma_enabled;
struct clk *ick;
struct clk *fck;
int clocked;
int irq;
int regshift;
int irqflags;
void __iomem *membase;
resource_size_t mapbase;
struct list_head node;
struct omap_hwmod *oh;
struct platform_device *pdev;
u32 errata;
#if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_PM)
int context_valid;
/* Registers to be saved/restored for OFF-mode */
u16 dll;
u16 dlh;
u16 ier;
u16 sysc;
u16 scr;
u16 wer;
u16 mcr;
#endif
};
static LIST_HEAD(uart_list);
static u8 num_uarts;
/*
* Since these idle/enable hooks are used in the idle path itself
* which has interrupts disabled, use the non-locking versions of
* the hwmod enable/disable functions.
*/
static int uart_idle_hwmod(struct omap_device *od)
{
_omap_hwmod_idle(od->hwmods[0]);
return 0;
}
static int uart_enable_hwmod(struct omap_device *od)
{
_omap_hwmod_enable(od->hwmods[0]);
return 0;
}
static struct omap_device_pm_latency omap_uart_latency[] = {
{
.deactivate_func = uart_idle_hwmod,
.activate_func = uart_enable_hwmod,
.flags = OMAP_DEVICE_LATENCY_AUTO_ADJUST,
},
};
static inline unsigned int __serial_read_reg(struct uart_port *up,
int offset)
{
offset <<= up->regshift;
return (unsigned int)__raw_readb(up->membase + offset);
}
static inline unsigned int serial_read_reg(struct omap_uart_state *uart,
int offset)
{
offset <<= uart->regshift;
return (unsigned int)__raw_readb(uart->membase + offset);
}
static inline void __serial_write_reg(struct uart_port *up, int offset,
int value)
{
offset <<= up->regshift;
__raw_writeb(value, up->membase + offset);
}
static inline void serial_write_reg(struct omap_uart_state *uart, int offset,
int value)
{
offset <<= uart->regshift;
__raw_writeb(value, uart->membase + offset);
}
/*
* Internal UARTs need to be initialized for the 8250 autoconfig to work
* properly. Note that the TX watermark initialization may not be needed
* once the 8250.c watermark handling code is merged.
*/
static inline void __init omap_uart_reset(struct omap_uart_state *uart)
{
serial_write_reg(uart, UART_OMAP_MDR1, 0x07);
serial_write_reg(uart, UART_OMAP_SCR, 0x08);
serial_write_reg(uart, UART_OMAP_MDR1, 0x00);
}
#if defined(CONFIG_PM) && defined(CONFIG_ARCH_OMAP3)
/*
* Work Around for Errata i202 (3430 - 1.12, 3630 - 1.6)
* 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_uart_mdr1_errataset(struct omap_uart_state *uart, u8 mdr1_val,
u8 fcr_val)
{
u8 timeout = 255;
serial_write_reg(uart, UART_OMAP_MDR1, mdr1_val);
udelay(2);
serial_write_reg(uart, UART_FCR, fcr_val | UART_FCR_CLEAR_XMIT |
UART_FCR_CLEAR_RCVR);
/*
* Wait for FIFO to empty: when empty, RX_FIFO_E bit is 0 and
* TX_FIFO_E bit is 1.
*/
while (UART_LSR_THRE != (serial_read_reg(uart, UART_LSR) &
(UART_LSR_THRE | UART_LSR_DR))) {
timeout--;
if (!timeout) {
/* Should *never* happen. we warn and carry on */
dev_crit(&uart->pdev->dev, "Errata i202: timedout %x\n",
serial_read_reg(uart, UART_LSR));
break;
}
udelay(1);
}
}
static void omap_uart_save_context(struct omap_uart_state *uart)
{
u16 lcr = 0;
if (!enable_off_mode)
return;
lcr = serial_read_reg(uart, UART_LCR);
serial_write_reg(uart, UART_LCR, 0xBF);
uart->dll = serial_read_reg(uart, UART_DLL);
uart->dlh = serial_read_reg(uart, UART_DLM);
serial_write_reg(uart, UART_LCR, lcr);
uart->ier = serial_read_reg(uart, UART_IER);
uart->sysc = serial_read_reg(uart, UART_OMAP_SYSC);
uart->scr = serial_read_reg(uart, UART_OMAP_SCR);
uart->wer = serial_read_reg(uart, UART_OMAP_WER);
serial_write_reg(uart, UART_LCR, 0x80);
uart->mcr = serial_read_reg(uart, UART_MCR);
serial_write_reg(uart, UART_LCR, lcr);
uart->context_valid = 1;
}
static void omap_uart_restore_context(struct omap_uart_state *uart)
{
u16 efr = 0;
if (!enable_off_mode)
return;
if (!uart->context_valid)
return;
uart->context_valid = 0;
if (uart->errata & UART_ERRATA_i202_MDR1_ACCESS)
omap_uart_mdr1_errataset(uart, 0x07, 0xA0);
else
serial_write_reg(uart, UART_OMAP_MDR1, 0x7);
serial_write_reg(uart, UART_LCR, 0xBF); /* Config B mode */
efr = serial_read_reg(uart, UART_EFR);
serial_write_reg(uart, UART_EFR, UART_EFR_ECB);
serial_write_reg(uart, UART_LCR, 0x0); /* Operational mode */
serial_write_reg(uart, UART_IER, 0x0);
serial_write_reg(uart, UART_LCR, 0xBF); /* Config B mode */
serial_write_reg(uart, UART_DLL, uart->dll);
serial_write_reg(uart, UART_DLM, uart->dlh);
serial_write_reg(uart, UART_LCR, 0x0); /* Operational mode */
serial_write_reg(uart, UART_IER, uart->ier);
serial_write_reg(uart, UART_LCR, 0x80);
serial_write_reg(uart, UART_MCR, uart->mcr);
serial_write_reg(uart, UART_LCR, 0xBF); /* Config B mode */
serial_write_reg(uart, UART_EFR, efr);
serial_write_reg(uart, UART_LCR, UART_LCR_WLEN8);
serial_write_reg(uart, UART_OMAP_SCR, uart->scr);
serial_write_reg(uart, UART_OMAP_WER, uart->wer);
serial_write_reg(uart, UART_OMAP_SYSC, uart->sysc);
if (uart->errata & UART_ERRATA_i202_MDR1_ACCESS)
omap_uart_mdr1_errataset(uart, 0x00, 0xA1);
else
/* UART 16x mode */
serial_write_reg(uart, UART_OMAP_MDR1, 0x00);
}
#else
static inline void omap_uart_save_context(struct omap_uart_state *uart) {}
static inline void omap_uart_restore_context(struct omap_uart_state *uart) {}
#endif /* CONFIG_PM && CONFIG_ARCH_OMAP3 */
static inline void omap_uart_enable_clocks(struct omap_uart_state *uart)
{
if (uart->clocked)
return;
omap_device_enable(uart->pdev);
uart->clocked = 1;
omap_uart_restore_context(uart);
}
#ifdef CONFIG_PM
static inline void omap_uart_disable_clocks(struct omap_uart_state *uart)
{
if (!uart->clocked)
return;
omap_uart_save_context(uart);
uart->clocked = 0;
omap_device_idle(uart->pdev);
}
static void omap_uart_enable_wakeup(struct omap_uart_state *uart)
{
/* Set wake-enable bit */
if (uart->wk_en && uart->wk_mask) {
u32 v = __raw_readl(uart->wk_en);
v |= uart->wk_mask;
__raw_writel(v, uart->wk_en);
}
/* Ensure IOPAD wake-enables are set */
if (cpu_is_omap34xx() && uart->padconf) {
u16 v = omap_ctrl_readw(uart->padconf);
v |= OMAP3_PADCONF_WAKEUPENABLE0;
omap_ctrl_writew(v, uart->padconf);
}
}
static void omap_uart_disable_wakeup(struct omap_uart_state *uart)
{
/* Clear wake-enable bit */
if (uart->wk_en && uart->wk_mask) {
u32 v = __raw_readl(uart->wk_en);
v &= ~uart->wk_mask;
__raw_writel(v, uart->wk_en);
}
/* Ensure IOPAD wake-enables are cleared */
if (cpu_is_omap34xx() && uart->padconf) {
u16 v = omap_ctrl_readw(uart->padconf);
v &= ~OMAP3_PADCONF_WAKEUPENABLE0;
omap_ctrl_writew(v, uart->padconf);
}
}
static void omap_uart_smart_idle_enable(struct omap_uart_state *uart,
int enable)
{
u8 idlemode;
if (enable) {
/**
* Errata 2.15: [UART]:Cannot Acknowledge Idle Requests
* in Smartidle Mode When Configured for DMA Operations.
*/
if (uart->dma_enabled)
idlemode = HWMOD_IDLEMODE_FORCE;
else
idlemode = HWMOD_IDLEMODE_SMART;
} else {
idlemode = HWMOD_IDLEMODE_NO;
}
omap_hwmod_set_slave_idlemode(uart->oh, idlemode);
}
static void omap_uart_block_sleep(struct omap_uart_state *uart)
{
omap_uart_enable_clocks(uart);
omap_uart_smart_idle_enable(uart, 0);
uart->can_sleep = 0;
if (uart->timeout)
mod_timer(&uart->timer, jiffies + uart->timeout);
else
del_timer(&uart->timer);
}
static void omap_uart_allow_sleep(struct omap_uart_state *uart)
{
if (device_may_wakeup(&uart->pdev->dev))
omap_uart_enable_wakeup(uart);
else
omap_uart_disable_wakeup(uart);
if (!uart->clocked)
return;
omap_uart_smart_idle_enable(uart, 1);
uart->can_sleep = 1;
del_timer(&uart->timer);
}
static void omap_uart_idle_timer(unsigned long data)
{
struct omap_uart_state *uart = (struct omap_uart_state *)data;
omap_uart_allow_sleep(uart);
}
void omap_uart_prepare_idle(int num)
{
struct omap_uart_state *uart;
list_for_each_entry(uart, &uart_list, node) {
if (num == uart->num && uart->can_sleep) {
omap_uart_disable_clocks(uart);
return;
}
}
}
void omap_uart_resume_idle(int num)
{
struct omap_uart_state *uart;
list_for_each_entry(uart, &uart_list, node) {
if (num == uart->num && uart->can_sleep) {
omap_uart_enable_clocks(uart);
/* Check for IO pad wakeup */
if (cpu_is_omap34xx() && uart->padconf) {
u16 p = omap_ctrl_readw(uart->padconf);
if (p & OMAP3_PADCONF_WAKEUPEVENT0)
omap_uart_block_sleep(uart);
}
/* Check for normal UART wakeup */
if (__raw_readl(uart->wk_st) & uart->wk_mask)
omap_uart_block_sleep(uart);
return;
}
}
}
void omap_uart_prepare_suspend(void)
{
struct omap_uart_state *uart;
list_for_each_entry(uart, &uart_list, node) {
omap_uart_allow_sleep(uart);
}
}
int omap_uart_can_sleep(void)
{
struct omap_uart_state *uart;
int can_sleep = 1;
list_for_each_entry(uart, &uart_list, node) {
if (!uart->clocked)
continue;
if (!uart->can_sleep) {
can_sleep = 0;
continue;
}
/* This UART can now safely sleep. */
omap_uart_allow_sleep(uart);
}
return can_sleep;
}
/**
* omap_uart_interrupt()
*
* This handler is used only to detect that *any* UART interrupt has
* occurred. It does _nothing_ to handle the interrupt. Rather,
* any UART interrupt will trigger the inactivity timer so the
* UART will not idle or sleep for its timeout period.
*
**/
/* static int first_interrupt; */
static irqreturn_t omap_uart_interrupt(int irq, void *dev_id)
{
struct omap_uart_state *uart = dev_id;
omap_uart_block_sleep(uart);
return IRQ_NONE;
}
static void omap_uart_idle_init(struct omap_uart_state *uart)
{
int ret;
uart->can_sleep = 0;
uart->timeout = DEFAULT_TIMEOUT;
setup_timer(&uart->timer, omap_uart_idle_timer,
(unsigned long) uart);
if (uart->timeout)
mod_timer(&uart->timer, jiffies + uart->timeout);
omap_uart_smart_idle_enable(uart, 0);
if (cpu_is_omap34xx()) {
u32 mod = (uart->num > 1) ? OMAP3430_PER_MOD : CORE_MOD;
u32 wk_mask = 0;
u32 padconf = 0;
uart->wk_en = OMAP34XX_PRM_REGADDR(mod, PM_WKEN1);
uart->wk_st = OMAP34XX_PRM_REGADDR(mod, PM_WKST1);
switch (uart->num) {
case 0:
wk_mask = OMAP3430_ST_UART1_MASK;
padconf = 0x182;
break;
case 1:
wk_mask = OMAP3430_ST_UART2_MASK;
padconf = 0x17a;
break;
case 2:
wk_mask = OMAP3430_ST_UART3_MASK;
padconf = 0x19e;
break;
case 3:
wk_mask = OMAP3630_ST_UART4_MASK;
padconf = 0x0d2;
break;
}
uart->wk_mask = wk_mask;
uart->padconf = padconf;
} else if (cpu_is_omap24xx()) {
u32 wk_mask = 0;
u32 wk_en = PM_WKEN1, wk_st = PM_WKST1;
switch (uart->num) {
case 0:
wk_mask = OMAP24XX_ST_UART1_MASK;
break;
case 1:
wk_mask = OMAP24XX_ST_UART2_MASK;
break;
case 2:
wk_en = OMAP24XX_PM_WKEN2;
wk_st = OMAP24XX_PM_WKST2;
wk_mask = OMAP24XX_ST_UART3_MASK;
break;
}
uart->wk_mask = wk_mask;
if (cpu_is_omap2430()) {
uart->wk_en = OMAP2430_PRM_REGADDR(CORE_MOD, wk_en);
uart->wk_st = OMAP2430_PRM_REGADDR(CORE_MOD, wk_st);
} else if (cpu_is_omap2420()) {
uart->wk_en = OMAP2420_PRM_REGADDR(CORE_MOD, wk_en);
uart->wk_st = OMAP2420_PRM_REGADDR(CORE_MOD, wk_st);
}
} else {
uart->wk_en = NULL;
uart->wk_st = NULL;
uart->wk_mask = 0;
uart->padconf = 0;
}
uart->irqflags |= IRQF_SHARED;
ret = request_threaded_irq(uart->irq, NULL, omap_uart_interrupt,
IRQF_SHARED, "serial idle", (void *)uart);
WARN_ON(ret);
}
void omap_uart_enable_irqs(int enable)
{
int ret;
struct omap_uart_state *uart;
list_for_each_entry(uart, &uart_list, node) {
if (enable) {
pm_runtime_put_sync(&uart->pdev->dev);
ret = request_threaded_irq(uart->irq, NULL,
omap_uart_interrupt,
IRQF_SHARED,
"serial idle",
(void *)uart);
} else {
pm_runtime_get_noresume(&uart->pdev->dev);
free_irq(uart->irq, (void *)uart);
}
}
}
static ssize_t sleep_timeout_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct platform_device *pdev = to_platform_device(dev);
struct omap_device *odev = to_omap_device(pdev);
struct omap_uart_state *uart = odev->hwmods[0]->dev_attr;
return sprintf(buf, "%u\n", uart->timeout / HZ);
}
static ssize_t sleep_timeout_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t n)
{
struct platform_device *pdev = to_platform_device(dev);
struct omap_device *odev = to_omap_device(pdev);
struct omap_uart_state *uart = odev->hwmods[0]->dev_attr;
unsigned int value;
if (sscanf(buf, "%u", &value) != 1) {
dev_err(dev, "sleep_timeout_store: Invalid value\n");
return -EINVAL;
}
uart->timeout = value * HZ;
if (uart->timeout)
mod_timer(&uart->timer, jiffies + uart->timeout);
else
/* A zero value means disable timeout feature */
omap_uart_block_sleep(uart);
return n;
}
static DEVICE_ATTR(sleep_timeout, 0644, sleep_timeout_show,
sleep_timeout_store);
#define DEV_CREATE_FILE(dev, attr) WARN_ON(device_create_file(dev, attr))
#else
static inline void omap_uart_idle_init(struct omap_uart_state *uart) {}
static void omap_uart_block_sleep(struct omap_uart_state *uart)
{
/* Needed to enable UART clocks when built without CONFIG_PM */
omap_uart_enable_clocks(uart);
}
#define DEV_CREATE_FILE(dev, attr)
#endif /* CONFIG_PM */
#ifndef CONFIG_SERIAL_OMAP
/*
* Override the default 8250 read handler: mem_serial_in()
* Empty RX fifo read causes an abort on omap3630 and omap4
* This function makes sure that an empty rx fifo is not read on these silicons
* (OMAP1/2/3430 are not affected)
*/
static unsigned int serial_in_override(struct uart_port *up, int offset)
{
if (UART_RX == offset) {
unsigned int lsr;
lsr = __serial_read_reg(up, UART_LSR);
if (!(lsr & UART_LSR_DR))
return -EPERM;
}
return __serial_read_reg(up, offset);
}
static void serial_out_override(struct uart_port *up, int offset, int value)
{
unsigned int status, tmout = 10000;
status = __serial_read_reg(up, UART_LSR);
while (!(status & UART_LSR_THRE)) {
/* Wait up to 10ms for the character(s) to be sent. */
if (--tmout == 0)
break;
udelay(1);
status = __serial_read_reg(up, UART_LSR);
}
__serial_write_reg(up, offset, value);
}
#endif
void __init omap_serial_early_init(void)
{
int i = 0;
do {
char oh_name[MAX_UART_HWMOD_NAME_LEN];
struct omap_hwmod *oh;
struct omap_uart_state *uart;
snprintf(oh_name, MAX_UART_HWMOD_NAME_LEN,
"uart%d", i + 1);
oh = omap_hwmod_lookup(oh_name);
if (!oh)
break;
uart = kzalloc(sizeof(struct omap_uart_state), GFP_KERNEL);
if (WARN_ON(!uart))
return;
uart->oh = oh;
uart->num = i++;
list_add_tail(&uart->node, &uart_list);
num_uarts++;
/*
* NOTE: omap_hwmod_init() has not yet been called,
* so no hwmod functions will work yet.
*/
/*
* During UART early init, device need to be probed
* to determine SoC specific init before omap_device
* is ready. Therefore, don't allow idle here
*/
uart->oh->flags |= HWMOD_INIT_NO_IDLE | HWMOD_INIT_NO_RESET;
} while (1);
}
/**
* omap_serial_init_port() - initialize single serial port
* @port: serial port number (0-3)
*
* This function initialies serial driver for given @port only.
* Platforms can call this function instead of omap_serial_init()
* if they don't plan to use all available UARTs as serial ports.
*
* Don't mix calls to omap_serial_init_port() and omap_serial_init(),
* use only one of the two.
*/
void __init omap_serial_init_port(int port)
{
struct omap_uart_state *uart;
struct omap_hwmod *oh;
struct omap_device *od;
void *pdata = NULL;
u32 pdata_size = 0;
char *name;
#ifndef CONFIG_SERIAL_OMAP
struct plat_serial8250_port ports[2] = {
{},
{.flags = 0},
};
struct plat_serial8250_port *p = &ports[0];
#else
struct omap_uart_port_info omap_up;
#endif
if (WARN_ON(port < 0))
return;
if (WARN_ON(port >= num_uarts))
return;
list_for_each_entry(uart, &uart_list, node)
if (port == uart->num)
break;
oh = uart->oh;
uart->dma_enabled = 0;
#ifndef CONFIG_SERIAL_OMAP
name = "serial8250";
/*
* !! 8250 driver does not use standard IORESOURCE* It
* has it's own custom pdata that can be taken from
* the hwmod resource data. But, this needs to be
* done after the build.
*
* ?? does it have to be done before the register ??
* YES, because platform_device_data_add() copies
* pdata, it does not use a pointer.
*/
p->flags = UPF_BOOT_AUTOCONF;
p->iotype = UPIO_MEM;
p->regshift = 2;
p->uartclk = OMAP24XX_BASE_BAUD * 16;
p->irq = oh->mpu_irqs[0].irq;
p->mapbase = oh->slaves[0]->addr->pa_start;
p->membase = omap_hwmod_get_mpu_rt_va(oh);
p->irqflags = IRQF_SHARED;
p->private_data = uart;
/*
* omap44xx: Never read empty UART fifo
* omap3xxx: Never read empty UART fifo on UARTs
* with IP rev >=0x52
*/
uart->regshift = p->regshift;
uart->membase = p->membase;
if (cpu_is_omap44xx())
uart->errata |= UART_ERRATA_FIFO_FULL_ABORT;
else if ((serial_read_reg(uart, UART_OMAP_MVER) & 0xFF)
>= UART_OMAP_NO_EMPTY_FIFO_READ_IP_REV)
uart->errata |= UART_ERRATA_FIFO_FULL_ABORT;
if (uart->errata & UART_ERRATA_FIFO_FULL_ABORT) {
p->serial_in = serial_in_override;
p->serial_out = serial_out_override;
}
pdata = &ports[0];
pdata_size = 2 * sizeof(struct plat_serial8250_port);
#else
name = DRIVER_NAME;
omap_up.dma_enabled = uart->dma_enabled;
omap_up.uartclk = OMAP24XX_BASE_BAUD * 16;
omap_up.mapbase = oh->slaves[0]->addr->pa_start;
omap_up.membase = omap_hwmod_get_mpu_rt_va(oh);
omap_up.irqflags = IRQF_SHARED;
omap_up.flags = UPF_BOOT_AUTOCONF | UPF_SHARE_IRQ;
pdata = &omap_up;
pdata_size = sizeof(struct omap_uart_port_info);
#endif
if (WARN_ON(!oh))
return;
od = omap_device_build(name, uart->num, oh, pdata, pdata_size,
omap_uart_latency,
ARRAY_SIZE(omap_uart_latency), false);
WARN(IS_ERR(od), "Could not build omap_device for %s: %s.\n",
name, oh->name);
uart->irq = oh->mpu_irqs[0].irq;
uart->regshift = 2;
uart->mapbase = oh->slaves[0]->addr->pa_start;
uart->membase = omap_hwmod_get_mpu_rt_va(oh);
uart->pdev = &od->pdev;
oh->dev_attr = uart;
acquire_console_sem(); /* in case the earlycon is on the UART */
/*
* Because of early UART probing, UART did not get idled
* on init. Now that omap_device is ready, ensure full idle
* before doing omap_device_enable().
*/
omap_hwmod_idle(uart->oh);
omap_device_enable(uart->pdev);
omap_uart_idle_init(uart);
omap_uart_reset(uart);
omap_hwmod_enable_wakeup(uart->oh);
omap_device_idle(uart->pdev);
/*
* Need to block sleep long enough for interrupt driven
* driver to start. Console driver is in polling mode
* so device needs to be kept enabled while polling driver
* is in use.
*/
if (uart->timeout)
uart->timeout = (30 * HZ);
omap_uart_block_sleep(uart);
uart->timeout = DEFAULT_TIMEOUT;
release_console_sem();
if ((cpu_is_omap34xx() && uart->padconf) ||
(uart->wk_en && uart->wk_mask)) {
device_init_wakeup(&od->pdev.dev, true);
DEV_CREATE_FILE(&od->pdev.dev, &dev_attr_sleep_timeout);
}
/* Enable the MDR1 errata for OMAP3 */
if (cpu_is_omap34xx())
uart->errata |= UART_ERRATA_i202_MDR1_ACCESS;
}
/**
* omap_serial_init() - intialize all supported serial ports
*
* Initializes all available UARTs as serial ports. Platforms
* can call this function when they want to have default behaviour
* for serial ports (e.g initialize them all as serial ports).
*/
void __init omap_serial_init(void)
{
struct omap_uart_state *uart;
list_for_each_entry(uart, &uart_list, node)
omap_serial_init_port(uart->num);
}
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