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[WATCHDOG] omap_wdt.c: sync linux-omap changes

Browse Source 
These are changes that have been sitting in linux-omap
and were never sent upstream.

Hopefully, it'll never happen again at least for this
driver.

Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Felipe Balbi 2008-09-20 04:14:01 +03:00 committed by Wim Van Sebroeck
parent e6bb42e3d6
commit 2817142f31
3 changed files with 203 additions and 129 deletions
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21
arch/arm/plat-omap/devices.c
View File

@ -441,16 +441,8 @@ static inline void omap_init_uwire(void) {}
#if defined(CONFIG_OMAP_WATCHDOG) || defined(CONFIG_OMAP_WATCHDOG_MODULE)
#ifdef CONFIG_ARCH_OMAP24XX
#define OMAP_WDT_BASE 0x48022000
#else
#define OMAP_WDT_BASE 0xfffeb000
#endif
static struct resource wdt_resources[] = {
{
.start = OMAP_WDT_BASE,
.end = OMAP_WDT_BASE + 0x4f,
.flags = IORESOURCE_MEM,
},
};
@ -464,6 +456,19 @@ static struct platform_device omap_wdt_device = {
static void omap_init_wdt(void)
{
if (cpu_is_omap16xx())
wdt_resources[0].start = 0xfffeb000;
else if (cpu_is_omap2420())
wdt_resources[0].start = 0x48022000; /* WDT2 */
else if (cpu_is_omap2430())
wdt_resources[0].start = 0x49016000; /* WDT2 */
else if (cpu_is_omap343x())
wdt_resources[0].start = 0x48314000; /* WDT2 */
else
return;
wdt_resources[0].end = wdt_resources[0].start + 0x4f;
(void) platform_device_register(&omap_wdt_device);
}
#else

283
drivers/watchdog/omap_wdt.c
View File

@ -1,7 +1,7 @@
/*
* linux/drivers/char/watchdog/omap_wdt.c
* omap_wdt.c
*
* Watchdog driver for the TI OMAP 16xx & 24xx 32KHz (non-secure) watchdog
* Watchdog driver for the TI OMAP 16xx & 24xx/34xx 32KHz (non-secure) watchdog
*
* Author: MontaVista Software, Inc.
* <gdavis@mvista.com> or <source@mvista.com>
@ -47,50 +47,63 @@
#include "omap_wdt.h"
static struct platform_device *omap_wdt_dev;
static unsigned timer_margin;
module_param(timer_margin, uint, 0);
MODULE_PARM_DESC(timer_margin, "initial watchdog timeout (in seconds)");
static int omap_wdt_users;
static struct clk *armwdt_ck;
static struct clk *mpu_wdt_ick;
static struct clk *mpu_wdt_fck;
static unsigned int wdt_trgr_pattern = 0x1234;
static spinlock_t wdt_lock;
static void omap_wdt_ping(void)
struct omap_wdt_dev {
void __iomem *base; /* physical */
struct device *dev;
int omap_wdt_users;
struct clk *armwdt_ck;
struct clk *mpu_wdt_ick;
struct clk *mpu_wdt_fck;
struct resource *mem;
struct miscdevice omap_wdt_miscdev;
};
static void omap_wdt_ping(struct omap_wdt_dev *wdev)
{
void __iomem *base = wdev->base;
/* wait for posted write to complete */
while ((omap_readl(OMAP_WATCHDOG_WPS)) & 0x08)
while ((omap_readl(base + OMAP_WATCHDOG_WPS)) & 0x08)
cpu_relax();
wdt_trgr_pattern = ~wdt_trgr_pattern;
omap_writel(wdt_trgr_pattern, (OMAP_WATCHDOG_TGR));
omap_writel(wdt_trgr_pattern, (base + OMAP_WATCHDOG_TGR));
/* wait for posted write to complete */
while ((omap_readl(OMAP_WATCHDOG_WPS)) & 0x08)
while ((omap_readl(base + OMAP_WATCHDOG_WPS)) & 0x08)
cpu_relax();
/* reloaded WCRR from WLDR */
}
static void omap_wdt_enable(void)
static void omap_wdt_enable(struct omap_wdt_dev *wdev)
{
void __iomem *base;
base = wdev->base;
/* Sequence to enable the watchdog */
omap_writel(0xBBBB, OMAP_WATCHDOG_SPR);
while ((omap_readl(OMAP_WATCHDOG_WPS)) & 0x10)
omap_writel(0xBBBB, base + OMAP_WATCHDOG_SPR);
while ((omap_readl(base + OMAP_WATCHDOG_WPS)) & 0x10)
cpu_relax();
omap_writel(0x4444, OMAP_WATCHDOG_SPR);
while ((omap_readl(OMAP_WATCHDOG_WPS)) & 0x10)
omap_writel(0x4444, base + OMAP_WATCHDOG_SPR);
while ((omap_readl(base + OMAP_WATCHDOG_WPS)) & 0x10)
cpu_relax();
}
static void omap_wdt_disable(void)
static void omap_wdt_disable(struct omap_wdt_dev *wdev)
{
void __iomem *base;
base = wdev->base;
/* sequence required to disable watchdog */
omap_writel(0xAAAA, OMAP_WATCHDOG_SPR); /* TIMER_MODE */
while (omap_readl(OMAP_WATCHDOG_WPS) & 0x10)
omap_writel(0xAAAA, base + OMAP_WATCHDOG_SPR); /* TIMER_MODE */
while (omap_readl(base + OMAP_WATCHDOG_WPS) & 0x10)
cpu_relax();
omap_writel(0x5555, OMAP_WATCHDOG_SPR); /* TIMER_MODE */
while (omap_readl(OMAP_WATCHDOG_WPS) & 0x10)
omap_writel(0x5555, base + OMAP_WATCHDOG_SPR); /* TIMER_MODE */
while (omap_readl(base + OMAP_WATCHDOG_WPS) & 0x10)
cpu_relax();
}
@ -103,15 +116,17 @@ static void omap_wdt_adjust_timeout(unsigned new_timeout)
timer_margin = new_timeout;
}
static void omap_wdt_set_timeout(void)
static void omap_wdt_set_timeout(struct omap_wdt_dev *wdev)
{
u32 pre_margin = GET_WLDR_VAL(timer_margin);
void __iomem *base;
base = wdev->base;
/* just count up at 32 KHz */
while (omap_readl(OMAP_WATCHDOG_WPS) & 0x04)
while (omap_readl(base + OMAP_WATCHDOG_WPS) & 0x04)
cpu_relax();
omap_writel(pre_margin, OMAP_WATCHDOG_LDR);
while (omap_readl(OMAP_WATCHDOG_WPS) & 0x04)
omap_writel(pre_margin, base + OMAP_WATCHDOG_LDR);
while (omap_readl(base + OMAP_WATCHDOG_WPS) & 0x04)
cpu_relax();
}
@ -121,65 +136,69 @@ static void omap_wdt_set_timeout(void)
static int omap_wdt_open(struct inode *inode, struct file *file)
{
if (test_and_set_bit(1, (unsigned long *)&omap_wdt_users))
struct omap_wdt_dev *wdev;
void __iomem *base;
wdev = platform_get_drvdata(omap_wdt_dev);
base = wdev->base;
if (test_and_set_bit(1, (unsigned long *)&(wdev->omap_wdt_users)))
return -EBUSY;
if (cpu_is_omap16xx())
clk_enable(armwdt_ck); /* Enable the clock */
clk_enable(wdev->armwdt_ck); /* Enable the clock */
if (cpu_is_omap24xx()) {
clk_enable(mpu_wdt_ick); /* Enable the interface clock */
clk_enable(mpu_wdt_fck); /* Enable the functional clock */
if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
clk_enable(wdev->mpu_wdt_ick); /* Enable the interface clock */
clk_enable(wdev->mpu_wdt_fck); /* Enable the functional clock */
}
/* initialize prescaler */
while (omap_readl(OMAP_WATCHDOG_WPS) & 0x01)
while (omap_readl(base + OMAP_WATCHDOG_WPS) & 0x01)
cpu_relax();
omap_writel((1 << 5) | (PTV << 2), OMAP_WATCHDOG_CNTRL);
while (omap_readl(OMAP_WATCHDOG_WPS) & 0x01)
omap_writel((1 << 5) | (PTV << 2), base + OMAP_WATCHDOG_CNTRL);
while (omap_readl(base + OMAP_WATCHDOG_WPS) & 0x01)
cpu_relax();
omap_wdt_set_timeout();
omap_wdt_enable();
file->private_data = (void *) wdev;
omap_wdt_set_timeout(wdev);
omap_wdt_enable(wdev);
return nonseekable_open(inode, file);
}
static int omap_wdt_release(struct inode *inode, struct file *file)
{
struct omap_wdt_dev *wdev;
wdev = file->private_data;
/*
* Shut off the timer unless NOWAYOUT is defined.
*/
#ifndef CONFIG_WATCHDOG_NOWAYOUT
omap_wdt_disable();
if (cpu_is_omap16xx()) {
clk_disable(armwdt_ck); /* Disable the clock */
clk_put(armwdt_ck);
armwdt_ck = NULL;
}
omap_wdt_disable(wdev);
if (cpu_is_omap24xx()) {
clk_disable(mpu_wdt_ick); /* Disable the clock */
clk_disable(mpu_wdt_fck); /* Disable the clock */
clk_put(mpu_wdt_ick);
clk_put(mpu_wdt_fck);
mpu_wdt_ick = NULL;
mpu_wdt_fck = NULL;
if (cpu_is_omap16xx())
clk_disable(wdev->armwdt_ck); /* Disable the clock */
if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
clk_disable(wdev->mpu_wdt_ick); /* Disable the clock */
clk_disable(wdev->mpu_wdt_fck); /* Disable the clock */
}
#else
printk(KERN_CRIT "omap_wdt: Unexpected close, not stopping!\n");
#endif
omap_wdt_users = 0;
wdev->omap_wdt_users = 0;
return 0;
}
static ssize_t omap_wdt_write(struct file *file, const char __user *data,
size_t len, loff_t *ppos)
{
struct omap_wdt_dev *wdev;
wdev = file->private_data;
/* Refresh LOAD_TIME. */
if (len) {
spin_lock(&wdt_lock);
omap_wdt_ping();
omap_wdt_ping(wdev);
spin_unlock(&wdt_lock);
}
return len;
@ -188,12 +207,14 @@ static ssize_t omap_wdt_write(struct file *file, const char __user *data,
static long omap_wdt_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct omap_wdt_dev *wdev;
int new_margin;
static const struct watchdog_info ident = {
.identity = "OMAP Watchdog",
.options = WDIOF_SETTIMEOUT,
.firmware_version = 0,
};
wdev = file->private_data;
switch (cmd) {
case WDIOC_GETSUPPORT:
@ -210,7 +231,7 @@ static long omap_wdt_ioctl(struct file *file, unsigned int cmd,
(int __user *)arg);
case WDIOC_KEEPALIVE:
spin_lock(&wdt_lock);
omap_wdt_ping();
omap_wdt_ping(wdev);
spin_unlock(&wdt_lock);
return 0;
case WDIOC_SETTIMEOUT:
@ -219,11 +240,11 @@ static long omap_wdt_ioctl(struct file *file, unsigned int cmd,
omap_wdt_adjust_timeout(new_margin);
spin_lock(&wdt_lock);
omap_wdt_disable();
omap_wdt_set_timeout();
omap_wdt_enable();
omap_wdt_disable(wdev);
omap_wdt_set_timeout(wdev);
omap_wdt_enable(wdev);
omap_wdt_ping();
omap_wdt_ping(wdev);
spin_unlock(&wdt_lock);
/* Fall */
case WDIOC_GETTIMEOUT:
@ -241,96 +262,150 @@ static const struct file_operations omap_wdt_fops = {
.release = omap_wdt_release,
};
static struct miscdevice omap_wdt_miscdev = {
.minor = WATCHDOG_MINOR,
.name = "watchdog",
.fops = &omap_wdt_fops,
};
static int __init omap_wdt_probe(struct platform_device *pdev)
{
struct resource *res, *mem;
int ret;
struct omap_wdt_dev *wdev;
/* reserve static register mappings */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENOENT;
if (omap_wdt_dev)
return -EBUSY;
mem = request_mem_region(res->start, res->end - res->start + 1,
pdev->name);
if (mem == NULL)
return -EBUSY;
platform_set_drvdata(pdev, mem);
omap_wdt_users = 0;
wdev = kzalloc(sizeof(struct omap_wdt_dev), GFP_KERNEL);
if (!wdev) {
ret = -ENOMEM;
goto fail;
}
wdev->omap_wdt_users = 0;
wdev->mem = mem;
if (cpu_is_omap16xx()) {
armwdt_ck = clk_get(&pdev->dev, "armwdt_ck");
if (IS_ERR(armwdt_ck)) {
ret = PTR_ERR(armwdt_ck);
armwdt_ck = NULL;
wdev->armwdt_ck = clk_get(&pdev->dev, "armwdt_ck");
if (IS_ERR(wdev->armwdt_ck)) {
ret = PTR_ERR(wdev->armwdt_ck);
wdev->armwdt_ck = NULL;
goto fail;
}
}
if (cpu_is_omap24xx()) {
mpu_wdt_ick = clk_get(&pdev->dev, "mpu_wdt_ick");
if (IS_ERR(mpu_wdt_ick)) {
ret = PTR_ERR(mpu_wdt_ick);
mpu_wdt_ick = NULL;
wdev->mpu_wdt_ick = clk_get(&pdev->dev, "mpu_wdt_ick");
if (IS_ERR(wdev->mpu_wdt_ick)) {
ret = PTR_ERR(wdev->mpu_wdt_ick);
wdev->mpu_wdt_ick = NULL;
goto fail;
}
mpu_wdt_fck = clk_get(&pdev->dev, "mpu_wdt_fck");
if (IS_ERR(mpu_wdt_fck)) {
ret = PTR_ERR(mpu_wdt_fck);
mpu_wdt_fck = NULL;
wdev->mpu_wdt_fck = clk_get(&pdev->dev, "mpu_wdt_fck");
if (IS_ERR(wdev->mpu_wdt_fck)) {
ret = PTR_ERR(wdev->mpu_wdt_fck);
wdev->mpu_wdt_fck = NULL;
goto fail;
}
}
omap_wdt_disable();
if (cpu_is_omap34xx()) {
wdev->mpu_wdt_ick = clk_get(&pdev->dev, "wdt2_ick");
if (IS_ERR(wdev->mpu_wdt_ick)) {
ret = PTR_ERR(wdev->mpu_wdt_ick);
wdev->mpu_wdt_ick = NULL;
goto fail;
}
wdev->mpu_wdt_fck = clk_get(&pdev->dev, "wdt2_fck");
if (IS_ERR(wdev->mpu_wdt_fck)) {
ret = PTR_ERR(wdev->mpu_wdt_fck);
wdev->mpu_wdt_fck = NULL;
goto fail;
}
}
wdev->base = (void __iomem *) (mem->start);
platform_set_drvdata(pdev, wdev);
omap_wdt_disable(wdev);
omap_wdt_adjust_timeout(timer_margin);
omap_wdt_miscdev.parent = &pdev->dev;
ret = misc_register(&omap_wdt_miscdev);
wdev->omap_wdt_miscdev.parent = &pdev->dev;
wdev->omap_wdt_miscdev.minor = WATCHDOG_MINOR;
wdev->omap_wdt_miscdev.name = "watchdog";
wdev->omap_wdt_miscdev.fops = &omap_wdt_fops;
ret = misc_register(&(wdev->omap_wdt_miscdev));
if (ret)
goto fail;
pr_info("OMAP Watchdog Timer: initial timeout %d sec\n", timer_margin);
pr_info("OMAP Watchdog Timer Rev 0x%02x: initial timeout %d sec\n",
omap_readl(wdev->base + OMAP_WATCHDOG_REV) & 0xFF,
timer_margin);
/* autogate OCP interface clock */
omap_writel(0x01, OMAP_WATCHDOG_SYS_CONFIG);
omap_writel(0x01, wdev->base + OMAP_WATCHDOG_SYS_CONFIG);
omap_wdt_dev = pdev;
return 0;
fail:
if (armwdt_ck)
clk_put(armwdt_ck);
if (mpu_wdt_ick)
clk_put(mpu_wdt_ick);
if (mpu_wdt_fck)
clk_put(mpu_wdt_fck);
release_resource(mem);
if (wdev) {
platform_set_drvdata(pdev, NULL);
if (wdev->armwdt_ck)
clk_put(wdev->armwdt_ck);
if (wdev->mpu_wdt_ick)
clk_put(wdev->mpu_wdt_ick);
if (wdev->mpu_wdt_fck)
clk_put(wdev->mpu_wdt_fck);
kfree(wdev);
}
if (mem) {
release_mem_region(res->start, res->end - res->start + 1);
}
return ret;
}
static void omap_wdt_shutdown(struct platform_device *pdev)
{
omap_wdt_disable();
struct omap_wdt_dev *wdev;
wdev = platform_get_drvdata(pdev);
if (wdev->omap_wdt_users)
omap_wdt_disable(wdev);
}
static int omap_wdt_remove(struct platform_device *pdev)
{
struct resource *mem = platform_get_drvdata(pdev);
misc_deregister(&omap_wdt_miscdev);
release_resource(mem);
if (armwdt_ck)
clk_put(armwdt_ck);
if (mpu_wdt_ick)
clk_put(mpu_wdt_ick);
if (mpu_wdt_fck)
clk_put(mpu_wdt_fck);
struct omap_wdt_dev *wdev;
wdev = platform_get_drvdata(pdev);
struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENOENT;
misc_deregister(&(wdev->omap_wdt_miscdev));
release_mem_region(res->start, res->end - res->start + 1);
platform_set_drvdata(pdev, NULL);
if (wdev->armwdt_ck) {
clk_put(wdev->armwdt_ck);
wdev->armwdt_ck = NULL;
}
if (wdev->mpu_wdt_ick) {
clk_put(wdev->mpu_wdt_ick);
wdev->mpu_wdt_ick = NULL;
}
if (wdev->mpu_wdt_fck) {
clk_put(wdev->mpu_wdt_fck);
wdev->mpu_wdt_fck = NULL;
}
kfree(wdev);
omap_wdt_dev = NULL;
return 0;
}
@ -344,16 +419,20 @@ static int omap_wdt_remove(struct platform_device *pdev)
static int omap_wdt_suspend(struct platform_device *pdev, pm_message_t state)
{
if (omap_wdt_users)
omap_wdt_disable();
struct omap_wdt_dev *wdev;
wdev = platform_get_drvdata(pdev);
if (wdev->omap_wdt_users)
omap_wdt_disable(wdev);
return 0;
}
static int omap_wdt_resume(struct platform_device *pdev)
{
if (omap_wdt_users) {
omap_wdt_enable();
omap_wdt_ping();
struct omap_wdt_dev *wdev;
wdev = platform_get_drvdata(pdev);
if (wdev->omap_wdt_users) {
omap_wdt_enable(wdev);
omap_wdt_ping(wdev);
}
return 0;
}

28
drivers/watchdog/omap_wdt.h
View File

@ -30,25 +30,15 @@
#ifndef _OMAP_WATCHDOG_H
#define _OMAP_WATCHDOG_H
#define OMAP1610_WATCHDOG_BASE 0xfffeb000
#define OMAP2420_WATCHDOG_BASE 0x48022000 /*WDT Timer 2 */
#ifdef CONFIG_ARCH_OMAP24XX
#define OMAP_WATCHDOG_BASE OMAP2420_WATCHDOG_BASE
#else
#define OMAP_WATCHDOG_BASE OMAP1610_WATCHDOG_BASE
#define RM_RSTST_WKUP 0
#endif
#define OMAP_WATCHDOG_REV (OMAP_WATCHDOG_BASE + 0x00)
#define OMAP_WATCHDOG_SYS_CONFIG (OMAP_WATCHDOG_BASE + 0x10)
#define OMAP_WATCHDOG_STATUS (OMAP_WATCHDOG_BASE + 0x14)
#define OMAP_WATCHDOG_CNTRL (OMAP_WATCHDOG_BASE + 0x24)
#define OMAP_WATCHDOG_CRR (OMAP_WATCHDOG_BASE + 0x28)
#define OMAP_WATCHDOG_LDR (OMAP_WATCHDOG_BASE + 0x2c)
#define OMAP_WATCHDOG_TGR (OMAP_WATCHDOG_BASE + 0x30)
#define OMAP_WATCHDOG_WPS (OMAP_WATCHDOG_BASE + 0x34)
#define OMAP_WATCHDOG_SPR (OMAP_WATCHDOG_BASE + 0x48)
#define OMAP_WATCHDOG_REV (0x00)
#define OMAP_WATCHDOG_SYS_CONFIG (0x10)
#define OMAP_WATCHDOG_STATUS (0x14)
#define OMAP_WATCHDOG_CNTRL (0x24)
#define OMAP_WATCHDOG_CRR (0x28)
#define OMAP_WATCHDOG_LDR (0x2c)
#define OMAP_WATCHDOG_TGR (0x30)
#define OMAP_WATCHDOG_WPS (0x34)
#define OMAP_WATCHDOG_SPR (0x48)
/* Using the prescaler, the OMAP watchdog could go for many
* months before firing. These limits work without scaling,