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authorArnd Bergmann <arnd@arndb.de>2019-09-08 22:33:51 +0200
committerArnd Bergmann <arnd@arndb.de>2022-04-19 21:33:57 +0200
commite86bd43bcfc579cf8935c1913e92cb76b4ba81c2 (patch)
treed4973a357656f2ab6af07a4d07c86b6acd389a3c /drivers/watchdog
parentee84cbd5df2beaf14e8af0955f1ab15ad3f81504 (diff)
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watchdog: sa1100: use platform device registration
Rather than relying on machine specific headers to pass down the reboot status and the register locations, use resources and platform_data. Aside from this, keep the changes to a minimum. Cc: Wim Van Sebroeck <wim@linux-watchdog.org> Cc: linux-watchdog@vger.kernel.org Acked-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/sa1100_wdt.c87
1 files changed, 63 insertions, 24 deletions
diff --git a/drivers/watchdog/sa1100_wdt.c b/drivers/watchdog/sa1100_wdt.c
index d33f0375112f..2d0a06a158a8 100644
--- a/drivers/watchdog/sa1100_wdt.c
+++ b/drivers/watchdog/sa1100_wdt.c
@@ -22,6 +22,7 @@
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/fs.h>
+#include <linux/platform_device.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/init.h>
@@ -30,16 +31,42 @@
#include <linux/uaccess.h>
#include <linux/timex.h>
-#ifdef CONFIG_ARCH_PXA
-#include <mach/regs-ost.h>
-#endif
+#define REG_OSMR0 0x0000 /* OS timer Match Reg. 0 */
+#define REG_OSMR1 0x0004 /* OS timer Match Reg. 1 */
+#define REG_OSMR2 0x0008 /* OS timer Match Reg. 2 */
+#define REG_OSMR3 0x000c /* OS timer Match Reg. 3 */
+#define REG_OSCR 0x0010 /* OS timer Counter Reg. */
+#define REG_OSSR 0x0014 /* OS timer Status Reg. */
+#define REG_OWER 0x0018 /* OS timer Watch-dog Enable Reg. */
+#define REG_OIER 0x001C /* OS timer Interrupt Enable Reg. */
-#include <mach/reset.h>
+#define OSSR_M3 (1 << 3) /* Match status channel 3 */
+#define OSSR_M2 (1 << 2) /* Match status channel 2 */
+#define OSSR_M1 (1 << 1) /* Match status channel 1 */
+#define OSSR_M0 (1 << 0) /* Match status channel 0 */
+
+#define OWER_WME (1 << 0) /* Watchdog Match Enable */
+
+#define OIER_E3 (1 << 3) /* Interrupt enable channel 3 */
+#define OIER_E2 (1 << 2) /* Interrupt enable channel 2 */
+#define OIER_E1 (1 << 1) /* Interrupt enable channel 1 */
+#define OIER_E0 (1 << 0) /* Interrupt enable channel 0 */
static unsigned long oscr_freq;
static unsigned long sa1100wdt_users;
static unsigned int pre_margin;
static int boot_status;
+static void __iomem *reg_base;
+
+static inline void sa1100_wr(u32 val, u32 offset)
+{
+ writel_relaxed(val, reg_base + offset);
+}
+
+static inline u32 sa1100_rd(u32 offset)
+{
+ return readl_relaxed(reg_base + offset);
+}
/*
* Allow only one person to hold it open
@@ -50,10 +77,10 @@ static int sa1100dog_open(struct inode *inode, struct file *file)
return -EBUSY;
/* Activate SA1100 Watchdog timer */
- writel_relaxed(readl_relaxed(OSCR) + pre_margin, OSMR3);
- writel_relaxed(OSSR_M3, OSSR);
- writel_relaxed(OWER_WME, OWER);
- writel_relaxed(readl_relaxed(OIER) | OIER_E3, OIER);
+ sa1100_wr(sa1100_rd(REG_OSCR) + pre_margin, REG_OSMR3);
+ sa1100_wr(OSSR_M3, REG_OSSR);
+ sa1100_wr(OWER_WME, REG_OWER);
+ sa1100_wr(sa1100_rd(REG_OIER) | OIER_E3, REG_OIER);
return stream_open(inode, file);
}
@@ -61,7 +88,7 @@ static int sa1100dog_open(struct inode *inode, struct file *file)
* The watchdog cannot be disabled.
*
* Previous comments suggested that turning off the interrupt by
- * clearing OIER[E3] would prevent the watchdog timing out but this
+ * clearing REG_OIER[E3] would prevent the watchdog timing out but this
* does not appear to be true (at least on the PXA255).
*/
static int sa1100dog_release(struct inode *inode, struct file *file)
@@ -76,7 +103,7 @@ static ssize_t sa1100dog_write(struct file *file, const char __user *data,
{
if (len)
/* Refresh OSMR3 timer. */
- writel_relaxed(readl_relaxed(OSCR) + pre_margin, OSMR3);
+ sa1100_wr(sa1100_rd(REG_OSCR) + pre_margin, REG_OSMR3);
return len;
}
@@ -110,7 +137,7 @@ static long sa1100dog_ioctl(struct file *file, unsigned int cmd,
break;
case WDIOC_KEEPALIVE:
- writel_relaxed(readl_relaxed(OSCR) + pre_margin, OSMR3);
+ sa1100_wr(sa1100_rd(REG_OSCR) + pre_margin, REG_OSMR3);
ret = 0;
break;
@@ -125,7 +152,7 @@ static long sa1100dog_ioctl(struct file *file, unsigned int cmd,
}
pre_margin = oscr_freq * time;
- writel_relaxed(readl_relaxed(OSCR) + pre_margin, OSMR3);
+ sa1100_wr(sa1100_rd(REG_OSCR) + pre_margin, REG_OSMR3);
fallthrough;
case WDIOC_GETTIMEOUT:
@@ -151,12 +178,22 @@ static struct miscdevice sa1100dog_miscdev = {
.fops = &sa1100dog_fops,
};
-static int margin __initdata = 60; /* (secs) Default is 1 minute */
+static int margin = 60; /* (secs) Default is 1 minute */
static struct clk *clk;
-static int __init sa1100dog_init(void)
+static int sa1100dog_probe(struct platform_device *pdev)
{
int ret;
+ int *platform_data;
+ struct resource *res;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENXIO;
+ reg_base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+ ret = PTR_ERR_OR_ZERO(reg_base);
+ if (ret)
+ return ret;
clk = clk_get(NULL, "OSTIMER0");
if (IS_ERR(clk)) {
@@ -174,13 +211,9 @@ static int __init sa1100dog_init(void)
oscr_freq = clk_get_rate(clk);
- /*
- * Read the reset status, and save it for later. If
- * we suspend, RCSR will be cleared, and the watchdog
- * reset reason will be lost.
- */
- boot_status = (reset_status & RESET_STATUS_WATCHDOG) ?
- WDIOF_CARDRESET : 0;
+ platform_data = pdev->dev.platform_data;
+ if (platform_data && *platform_data)
+ boot_status = WDIOF_CARDRESET;
pre_margin = oscr_freq * margin;
ret = misc_register(&sa1100dog_miscdev);
@@ -196,15 +229,21 @@ err:
return ret;
}
-static void __exit sa1100dog_exit(void)
+static int sa1100dog_remove(struct platform_device *pdev)
{
misc_deregister(&sa1100dog_miscdev);
clk_disable_unprepare(clk);
clk_put(clk);
+
+ return 0;
}
-module_init(sa1100dog_init);
-module_exit(sa1100dog_exit);
+struct platform_driver sa1100dog_driver = {
+ .driver.name = "sa1100_wdt",
+ .probe = sa1100dog_probe,
+ .remove = sa1100dog_remove,
+};
+module_platform_driver(sa1100dog_driver);
MODULE_AUTHOR("Oleg Drokin <green@crimea.edu>");
MODULE_DESCRIPTION("SA1100/PXA2xx Watchdog");