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path: root/drivers/watchdog/omap_wdt.c
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Diffstat (limited to 'drivers/watchdog/omap_wdt.c')
-rw-r--r--drivers/watchdog/omap_wdt.c337
1 files changed, 224 insertions, 113 deletions
diff --git a/drivers/watchdog/omap_wdt.c b/drivers/watchdog/omap_wdt.c
index 3a11dadfd8e..7bcbb7f4745 100644
--- a/drivers/watchdog/omap_wdt.c
+++ b/drivers/watchdog/omap_wdt.c
@@ -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 +47,68 @@
#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 ((__raw_readl(base + OMAP_WATCHDOG_WPS)) & 0x08)
cpu_relax();
+
wdt_trgr_pattern = ~wdt_trgr_pattern;
- omap_writel(wdt_trgr_pattern, (OMAP_WATCHDOG_TGR));
+ __raw_writel(wdt_trgr_pattern, (base + OMAP_WATCHDOG_TGR));
+
/* wait for posted write to complete */
- while ((omap_readl(OMAP_WATCHDOG_WPS)) & 0x08)
+ while ((__raw_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 = wdev->base;
+
/* Sequence to enable the watchdog */
- omap_writel(0xBBBB, OMAP_WATCHDOG_SPR);
- while ((omap_readl(OMAP_WATCHDOG_WPS)) & 0x10)
+ __raw_writel(0xBBBB, base + OMAP_WATCHDOG_SPR);
+ while ((__raw_readl(base + OMAP_WATCHDOG_WPS)) & 0x10)
cpu_relax();
- omap_writel(0x4444, OMAP_WATCHDOG_SPR);
- while ((omap_readl(OMAP_WATCHDOG_WPS)) & 0x10)
+
+ __raw_writel(0x4444, base + OMAP_WATCHDOG_SPR);
+ while ((__raw_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 = wdev->base;
+
/* sequence required to disable watchdog */
- omap_writel(0xAAAA, OMAP_WATCHDOG_SPR); /* TIMER_MODE */
- while (omap_readl(OMAP_WATCHDOG_WPS) & 0x10)
+ __raw_writel(0xAAAA, base + OMAP_WATCHDOG_SPR); /* TIMER_MODE */
+ while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x10)
cpu_relax();
- omap_writel(0x5555, OMAP_WATCHDOG_SPR); /* TIMER_MODE */
- while (omap_readl(OMAP_WATCHDOG_WPS) & 0x10)
+
+ __raw_writel(0x5555, base + OMAP_WATCHDOG_SPR); /* TIMER_MODE */
+ while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x10)
cpu_relax();
}
@@ -103,83 +121,90 @@ 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 = wdev->base;
/* just count up at 32 KHz */
- while (omap_readl(OMAP_WATCHDOG_WPS) & 0x04)
+ while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x04)
cpu_relax();
- omap_writel(pre_margin, OMAP_WATCHDOG_LDR);
- while (omap_readl(OMAP_WATCHDOG_WPS) & 0x04)
+
+ __raw_writel(pre_margin, base + OMAP_WATCHDOG_LDR);
+ while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x04)
cpu_relax();
}
/*
* Allow only one task to hold it open
*/
-
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 = platform_get_drvdata(omap_wdt_dev);
+ void __iomem *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 (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x01)
cpu_relax();
- omap_writel((1 << 5) | (PTV << 2), OMAP_WATCHDOG_CNTRL);
- while (omap_readl(OMAP_WATCHDOG_WPS) & 0x01)
+
+ __raw_writel((1 << 5) | (PTV << 2), base + OMAP_WATCHDOG_CNTRL);
+ while (__raw_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 = 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 = 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;
@@ -188,6 +213,7 @@ 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",
@@ -195,6 +221,8 @@ static long omap_wdt_ioctl(struct file *file, unsigned int cmd,
.firmware_version = 0,
};
+ wdev = file->private_data;
+
switch (cmd) {
case WDIOC_GETSUPPORT:
return copy_to_user((struct watchdog_info __user *)arg, &ident,
@@ -203,14 +231,14 @@ static long omap_wdt_ioctl(struct file *file, unsigned int cmd,
return put_user(0, (int __user *)arg);
case WDIOC_GETBOOTSTATUS:
if (cpu_is_omap16xx())
- return put_user(omap_readw(ARM_SYSST),
+ return put_user(__raw_readw(ARM_SYSST),
(int __user *)arg);
if (cpu_is_omap24xx())
return put_user(omap_prcm_get_reset_sources(),
(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 +247,11 @@ 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 +269,173 @@ 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;
+ struct omap_wdt_dev *wdev;
int ret;
/* reserve static register mappings */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res)
- return -ENOENT;
+ if (!res) {
+ ret = -ENOENT;
+ goto err_get_resource;
+ }
+
+ if (omap_wdt_dev) {
+ ret = -EBUSY;
+ goto err_busy;
+ }
mem = request_mem_region(res->start, res->end - res->start + 1,
pdev->name);
- if (mem == NULL)
- return -EBUSY;
+ if (!mem) {
+ ret = -EBUSY;
+ goto err_busy;
+ }
- platform_set_drvdata(pdev, mem);
+ wdev = kzalloc(sizeof(struct omap_wdt_dev), GFP_KERNEL);
+ if (!wdev) {
+ ret = -ENOMEM;
+ goto err_kzalloc;
+ }
- omap_wdt_users = 0;
+ 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;
- goto fail;
+ 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 err_clk;
}
}
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;
- goto fail;
+ 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 err_clk;
}
- 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;
- goto fail;
+ 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 err_clk;
}
}
- 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 err_clk;
+ }
+ 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 err_clk;
+ }
+ }
+ wdev->base = ioremap(res->start, res->end - res->start + 1);
+ if (!wdev->base) {
+ ret = -ENOMEM;
+ goto err_ioremap;
+ }
+
+ 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;
+ goto err_misc;
- 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",
+ __raw_readl(wdev->base + OMAP_WATCHDOG_REV) & 0xFF,
+ timer_margin);
/* autogate OCP interface clock */
- omap_writel(0x01, OMAP_WATCHDOG_SYS_CONFIG);
+ __raw_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);
+err_misc:
+ platform_set_drvdata(pdev, NULL);
+ iounmap(wdev->base);
+
+err_ioremap:
+ wdev->base = NULL;
+
+err_clk:
+ 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);
+
+err_kzalloc:
+ release_mem_region(res->start, res->end - res->start + 1);
+
+err_busy:
+err_get_resource:
+
return ret;
}
static void omap_wdt_shutdown(struct platform_device *pdev)
{
- omap_wdt_disable();
+ struct omap_wdt_dev *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 = 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;
+ }
+ iounmap(wdev->base);
+
+ kfree(wdev);
+ omap_wdt_dev = NULL;
+
return 0;
}
@@ -344,17 +449,23 @@ 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 = 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 = platform_get_drvdata(pdev);
+
+ if (wdev->omap_wdt_users) {
+ omap_wdt_enable(wdev);
+ omap_wdt_ping(wdev);
}
+
return 0;
}