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Date: Fri, 19 Sep 2008 13:32:39 +0300
From: Felipe Balbi <felipe.balbi@...ia.com>
To: linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Cc: Tony Lindgren <tony@...mide.com>,
Russell King - ARM Linux <linux@....linux.org.uk>,
Wim Van Sebroeck <wim@...ana.be>,
Andrew Morton <akpm@...ux-foundation.org>,
"George G. Davis" <gdavis@...sta.com>,
Felipe Balbi <felipe.balbi@...ia.com>
Subject: [PATCH 5/5] watchdog: introduce platform_data and remove cpu conditional code
Get rid of cpu conditional code.
Signed-off-by: Felipe Balbi <felipe.balbi@...ia.com>
---
arch/arm/plat-omap/devices.c | 65 +++++++++++++++++--
drivers/watchdog/omap_wdt.c | 126 ++++++++++++------------------------
include/linux/watchdog/omap_wdt.h | 29 +++++++++
3 files changed, 131 insertions(+), 89 deletions(-)
diff --git a/arch/arm/plat-omap/devices.c b/arch/arm/plat-omap/devices.c
index f1eaa44..d756743 100644
--- a/arch/arm/plat-omap/devices.c
+++ b/arch/arm/plat-omap/devices.c
@@ -13,6 +13,7 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
+#include <linux/watchdog/omap_wdt.h>
#include <mach/hardware.h>
#include <asm/io.h>
@@ -460,6 +461,51 @@ static struct resource wdt_resources[] = {
},
};
+static int omap_wdt_set_clock(struct omap_wdt_dev *wdev, int status)
+{
+ if (status) {
+ if (cpu_is_omap16xx())
+ clk_disable(wdev->fck);
+
+ if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
+ clk_disable(wdev->ick);
+ clk_disable(wdev->fck);
+ }
+ } else {
+ if (cpu_is_omap16xx())
+ clk_disable(wdev->fck);
+
+ if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
+ clk_disable(wdev->ick);
+ clk_disable(wdev->fck);
+ }
+ }
+
+ return 0;
+}
+
+static int omap_wdt_get_bootstatus(void)
+{
+ if (cpu_is_omap16xx())
+ return __raw_readw(ARM_SYSST);
+
+#if 0
+ /* REVISIT: When the patch introducing the following function
+ * gets merged upstream, uncomment this code to enable omap2
+ * support on omap watchdog driver.
+ */
+ if (cpu_is_omap24xx())
+ return omap_prcm_get_reset_sources();
+#endif
+
+ return 0;
+}
+
+static struct omap_wdt_platform_data omap_wdt_pdata = {
+ .set_clock = omap_wdt_set_clock,
+ .get_bootstatus = omap_wdt_get_bootstatus,
+};
+
static struct platform_device omap_wdt_device = {
.name = "omap_wdt",
.id = -1,
@@ -469,17 +515,26 @@ static struct platform_device omap_wdt_device = {
static void omap_init_wdt(void)
{
- if (cpu_is_omap16xx())
+ if (cpu_is_omap16xx()) {
+ omap_wdt_pdata.fck = "armwdt_ck";
wdt_resources[0].start = 0xfffeb000;
- else if (cpu_is_omap2420())
+ } else if (cpu_is_omap2420()) {
+ omap_wdt_pdata.fck = "mpu_wdt_ick";
+ omap_wdt_pdata.ick = "mpu_wdt_fck";
wdt_resources[0].start = 0x48022000; /* WDT2 */
- else if (cpu_is_omap2430())
+ } else if (cpu_is_omap2430()) {
+ omap_wdt_pdata.fck = "mpu_wdt_ick";
+ omap_wdt_pdata.ick = "mpu_wdt_fck";
wdt_resources[0].start = 0x49016000; /* WDT2 */
- else if (cpu_is_omap343x())
+ } else if (cpu_is_omap343x()) {
+ omap_wdt_pdata.fck = "wdt2_ick";
+ omap_wdt_pdata.ick = "wdt2_fck";
wdt_resources[0].start = 0x48314000; /* WDT2 */
- else
+ } else {
return;
+ }
+ omap_wdt_device.dev.platform_data = &omap_wdt_pdata;
wdt_resources[0].end = wdt_resources[0].start + 0x4f;
(void) platform_device_register(&omap_wdt_device);
diff --git a/drivers/watchdog/omap_wdt.c b/drivers/watchdog/omap_wdt.c
index 8b68bc0..c113953 100644
--- a/drivers/watchdog/omap_wdt.c
+++ b/drivers/watchdog/omap_wdt.c
@@ -47,25 +47,21 @@
#include <mach/hardware.h>
#include <mach/prcm.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 struct platform_device *omap_wdt_dev;
static unsigned int wdt_trgr_pattern = 0x1234;
static spinlock_t wdt_lock;
-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 inline int omap_wdt_set_clock(struct omap_wdt_dev *wdev, int status)
+{
+ if (wdev->set_clock)
+ return wdev->set_clock(wdev, status);
+
+ return 0;
+}
static void omap_wdt_ping(struct omap_wdt_dev *wdev)
{
@@ -146,13 +142,7 @@ static int omap_wdt_open(struct inode *inode, struct file *file)
if (test_and_set_bit(1, (unsigned long *)&(wdev->omap_wdt_users)))
return -EBUSY;
- if (cpu_is_omap16xx())
- clk_enable(wdev->armwdt_ck); /* Enable the 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 */
- }
+ omap_wdt_set_clock(wdev, 1);
/* initialize prescaler */
while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x01)
@@ -178,16 +168,8 @@ static int omap_wdt_release(struct inode *inode, struct file *file)
* Shut off the timer unless NOWAYOUT is defined.
*/
#ifndef CONFIG_WATCHDOG_NOWAYOUT
-
omap_wdt_disable(wdev);
-
- 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 */
- }
+ omap_wdt_set_clock(wdev, 1);
#else
printk(KERN_CRIT "omap_wdt: Unexpected close, not stopping!\n");
#endif
@@ -230,12 +212,8 @@ static long omap_wdt_ioctl(struct file *file, unsigned int cmd,
case WDIOC_GETSTATUS:
return put_user(0, (int __user *)arg);
case WDIOC_GETBOOTSTATUS:
- if (cpu_is_omap16xx())
- 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);
+ return put_user(wdev->get_bootstatus(),
+ (int __user *)arg);
case WDIOC_KEEPALIVE:
spin_lock(&wdt_lock);
omap_wdt_ping(wdev);
@@ -271,6 +249,7 @@ static const struct file_operations omap_wdt_fops = {
static int __init omap_wdt_probe(struct platform_device *pdev)
{
+ struct omap_wdt_platform_data *pdata = pdev->dev.platform_data;
struct resource *res, *mem;
struct omap_wdt_dev *wdev;
int ret;
@@ -283,7 +262,7 @@ static int __init omap_wdt_probe(struct platform_device *pdev)
}
if (omap_wdt_dev) {
- ret - EBUSY;
+ ret = EBUSY;
goto err_busy;
}
@@ -302,45 +281,30 @@ static int __init omap_wdt_probe(struct platform_device *pdev)
wdev->omap_wdt_users = 0;
wdev->mem = mem;
+ wdev->get_bootstatus = pdata->get_bootstatus;
+ wdev->set_clock = pdata->set_clock;
- if (cpu_is_omap16xx()) {
- 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;
- }
+ /* omap1 has only the functional clock so we believe everybody
+ * will pass that pointer correctly. For the interface clock,
+ * we check whether that pointer is true to avoid null pointer
+ * dereferences
+ */
+ wdev->fck = clk_get(&pdev->dev, pdata->fck);
+ if (IS_ERR(wdev->fck)) {
+ ret = PTR_ERR(wdev->fck);
+ wdev->fck = NULL;
+ goto err_clk;
}
- if (cpu_is_omap24xx()) {
- 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;
- }
- 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;
+ if (pdata->ick) {
+ wdev->ick = clk_get(&pdev->dev, pdata->ick);
+ if (IS_ERR(wdev->ick)) {
+ ret = PTR_ERR(wdev->ick);
+ wdev->ick = NULL;
goto err_clk;
}
}
- 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;
@@ -380,12 +344,11 @@ 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);
+ if (wdev->fck)
+ clk_put(wdev->fck);
+ if (wdev->ick)
+ clk_put(wdev->ick);
+
kfree(wdev);
err_kzalloc:
@@ -417,19 +380,14 @@ static int omap_wdt_remove(struct platform_device *pdev)
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->fck) {
+ clk_put(wdev->fck);
+ wdev->fck = NULL;
}
- if (wdev->mpu_wdt_fck) {
- clk_put(wdev->mpu_wdt_fck);
- wdev->mpu_wdt_fck = NULL;
+ if (wdev->ick) {
+ clk_put(wdev->ick);
+ wdev->ick = NULL;
}
iounmap(wdev->base);
diff --git a/include/linux/watchdog/omap_wdt.h b/include/linux/watchdog/omap_wdt.h
index 62e6a74..858d9a4 100644
--- a/include/linux/watchdog/omap_wdt.h
+++ b/include/linux/watchdog/omap_wdt.h
@@ -30,6 +30,9 @@
#ifndef _OMAP_WATCHDOG_H
#define _OMAP_WATCHDOG_H
+#include <linux/clk.h>
+#include <linux/miscdevice.h>
+
#define OMAP_WATCHDOG_REV (0x00)
#define OMAP_WATCHDOG_SYS_CONFIG (0x10)
#define OMAP_WATCHDOG_STATUS (0x14)
@@ -51,4 +54,30 @@
#define PTV 0 /* prescale */
#define GET_WLDR_VAL(secs) (0xffffffff - ((secs) * (32768/(1<<PTV))) + 1)
+struct omap_wdt_dev {
+ void __iomem *base; /* physical */
+ struct device *dev;
+ int omap_wdt_users;
+
+ struct clk *ick;
+ struct clk *fck;
+
+ struct resource *mem;
+ struct miscdevice omap_wdt_miscdev;
+
+ /* clock handling */
+ int (*set_clock)(struct omap_wdt_dev *wdev, int status);
+
+ /* used for put_user() */
+ int (*get_bootstatus)(void);
+};
+
+struct omap_wdt_platform_data {
+ const char *ick;
+ const char *fck;
+
+ int (*set_clock)(struct omap_wdt_dev *wdev, int status);
+ int (*get_bootstatus)(void);
+};
+
#endif /* _OMAP_WATCHDOG_H */
--
1.6.0.1.308.gede4c
--
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