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path: root/drivers/watchdog/ath79_wdt.c
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Diffstat (limited to 'drivers/watchdog/ath79_wdt.c')
-rw-r--r--drivers/watchdog/ath79_wdt.c66
1 files changed, 51 insertions, 15 deletions
diff --git a/drivers/watchdog/ath79_wdt.c b/drivers/watchdog/ath79_wdt.c
index 38a999e60c0..898799074a1 100644
--- a/drivers/watchdog/ath79_wdt.c
+++ b/drivers/watchdog/ath79_wdt.c
@@ -23,6 +23,7 @@
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/init.h>
+#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
@@ -32,14 +33,16 @@
#include <linux/watchdog.h>
#include <linux/clk.h>
#include <linux/err.h>
-
-#include <asm/mach-ath79/ath79.h>
-#include <asm/mach-ath79/ar71xx_regs.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
#define DRIVER_NAME "ath79-wdt"
#define WDT_TIMEOUT 15 /* seconds */
+#define WDOG_REG_CTRL 0x00
+#define WDOG_REG_TIMER 0x04
+
#define WDOG_CTRL_LAST_RESET BIT(31)
#define WDOG_CTRL_ACTION_MASK 3
#define WDOG_CTRL_ACTION_NONE 0 /* no action */
@@ -66,27 +69,38 @@ static struct clk *wdt_clk;
static unsigned long wdt_freq;
static int boot_status;
static int max_timeout;
+static void __iomem *wdt_base;
+
+static inline void ath79_wdt_wr(unsigned reg, u32 val)
+{
+ iowrite32(val, wdt_base + reg);
+}
+
+static inline u32 ath79_wdt_rr(unsigned reg)
+{
+ return ioread32(wdt_base + reg);
+}
static inline void ath79_wdt_keepalive(void)
{
- ath79_reset_wr(AR71XX_RESET_REG_WDOG, wdt_freq * timeout);
+ ath79_wdt_wr(WDOG_REG_TIMER, wdt_freq * timeout);
/* flush write */
- ath79_reset_rr(AR71XX_RESET_REG_WDOG);
+ ath79_wdt_rr(WDOG_REG_TIMER);
}
static inline void ath79_wdt_enable(void)
{
ath79_wdt_keepalive();
- ath79_reset_wr(AR71XX_RESET_REG_WDOG_CTRL, WDOG_CTRL_ACTION_FCR);
+ ath79_wdt_wr(WDOG_REG_CTRL, WDOG_CTRL_ACTION_FCR);
/* flush write */
- ath79_reset_rr(AR71XX_RESET_REG_WDOG_CTRL);
+ ath79_wdt_rr(WDOG_REG_CTRL);
}
static inline void ath79_wdt_disable(void)
{
- ath79_reset_wr(AR71XX_RESET_REG_WDOG_CTRL, WDOG_CTRL_ACTION_NONE);
+ ath79_wdt_wr(WDOG_REG_CTRL, WDOG_CTRL_ACTION_NONE);
/* flush write */
- ath79_reset_rr(AR71XX_RESET_REG_WDOG_CTRL);
+ ath79_wdt_rr(WDOG_REG_CTRL);
}
static int ath79_wdt_set_timeout(int val)
@@ -226,16 +240,32 @@ static struct miscdevice ath79_wdt_miscdev = {
static int ath79_wdt_probe(struct platform_device *pdev)
{
+ struct resource *res;
u32 ctrl;
int err;
- wdt_clk = clk_get(&pdev->dev, "wdt");
+ if (wdt_base)
+ return -EBUSY;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "no memory resource found\n");
+ return -EINVAL;
+ }
+
+ wdt_base = devm_request_and_ioremap(&pdev->dev, res);
+ if (!wdt_base) {
+ dev_err(&pdev->dev, "unable to remap memory region\n");
+ return -ENOMEM;
+ }
+
+ wdt_clk = devm_clk_get(&pdev->dev, "wdt");
if (IS_ERR(wdt_clk))
return PTR_ERR(wdt_clk);
err = clk_enable(wdt_clk);
if (err)
- goto err_clk_put;
+ return err;
wdt_freq = clk_get_rate(wdt_clk);
if (!wdt_freq) {
@@ -251,7 +281,7 @@ static int ath79_wdt_probe(struct platform_device *pdev)
max_timeout, timeout);
}
- ctrl = ath79_reset_rr(AR71XX_RESET_REG_WDOG_CTRL);
+ ctrl = ath79_wdt_rr(WDOG_REG_CTRL);
boot_status = (ctrl & WDOG_CTRL_LAST_RESET) ? WDIOF_CARDRESET : 0;
err = misc_register(&ath79_wdt_miscdev);
@@ -265,8 +295,6 @@ static int ath79_wdt_probe(struct platform_device *pdev)
err_clk_disable:
clk_disable(wdt_clk);
-err_clk_put:
- clk_put(wdt_clk);
return err;
}
@@ -274,7 +302,6 @@ static int ath79_wdt_remove(struct platform_device *pdev)
{
misc_deregister(&ath79_wdt_miscdev);
clk_disable(wdt_clk);
- clk_put(wdt_clk);
return 0;
}
@@ -283,6 +310,14 @@ static void ath97_wdt_shutdown(struct platform_device *pdev)
ath79_wdt_disable();
}
+#ifdef CONFIG_OF
+static const struct of_device_id ath79_wdt_match[] = {
+ { .compatible = "qca,ar7130-wdt" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ath79_wdt_match);
+#endif
+
static struct platform_driver ath79_wdt_driver = {
.probe = ath79_wdt_probe,
.remove = ath79_wdt_remove,
@@ -290,6 +325,7 @@ static struct platform_driver ath79_wdt_driver = {
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(ath79_wdt_match),
},
};