[PATCH 4/4] ARM: kirkwood: convert orion-wdt to fdt.
Jason Cooper
jason at lakedaemon.net
Thu Mar 1 13:20:55 EST 2012
Converted register address to a variable so that it could be set from
fdt. Also, pull clock frequency from fdt and clean up failure logic a
bit.
Same as rtc-mv, this device is used in all kirkwood boards. So, it is
placed in kirkwood.dtsi.
Signed-off-by: Jason Cooper <jason at lakedaemon.net>
---
arch/arm/boot/dts/kirkwood.dtsi | 6 +++++
arch/arm/mach-kirkwood/board-dt.c | 1 -
arch/arm/mach-kirkwood/common.c | 2 +-
arch/arm/mach-kirkwood/common.h | 1 -
drivers/watchdog/orion_wdt.c | 44 ++++++++++++++++++++++++++----------
5 files changed, 39 insertions(+), 15 deletions(-)
diff --git a/arch/arm/boot/dts/kirkwood.dtsi b/arch/arm/boot/dts/kirkwood.dtsi
index 5fb185c..bf28424 100644
--- a/arch/arm/boot/dts/kirkwood.dtsi
+++ b/arch/arm/boot/dts/kirkwood.dtsi
@@ -8,5 +8,11 @@
reg = <0xf1010300 0x1f>;
interrupts = <53>;
};
+
+ wdt at fed20300 {
+ compatible = "marvell,orion-wdt";
+ reg = <0xfed20300 0x28>;
+ clock-frequency = <200000000>;
+ };
};
diff --git a/arch/arm/mach-kirkwood/board-dt.c b/arch/arm/mach-kirkwood/board-dt.c
index 6fc41ae..7ef5fb7 100644
--- a/arch/arm/mach-kirkwood/board-dt.c
+++ b/arch/arm/mach-kirkwood/board-dt.c
@@ -135,7 +135,6 @@ static void __init kirkwood_dt_init(void)
#endif
/* internal devices that every board has */
- kirkwood_wdt_init();
kirkwood_xor0_init();
kirkwood_xor1_init();
kirkwood_crypto_init();
diff --git a/arch/arm/mach-kirkwood/common.c b/arch/arm/mach-kirkwood/common.c
index 0c0375f..35dc40b 100644
--- a/arch/arm/mach-kirkwood/common.c
+++ b/arch/arm/mach-kirkwood/common.c
@@ -303,7 +303,7 @@ void __init kirkwood_xor1_init(void)
/*****************************************************************************
* Watchdog
****************************************************************************/
-void __init kirkwood_wdt_init(void)
+static void __init kirkwood_wdt_init(void)
{
orion_wdt_init(kirkwood_tclk);
}
diff --git a/arch/arm/mach-kirkwood/common.h b/arch/arm/mach-kirkwood/common.h
index ca08826..ac4b2fb 100644
--- a/arch/arm/mach-kirkwood/common.h
+++ b/arch/arm/mach-kirkwood/common.h
@@ -53,7 +53,6 @@ void kirkwood_restart(char, const char *);
char *kirkwood_id(void);
void kirkwood_l2_init(void);
-void kirkwood_wdt_init(void);
void kirkwood_xor0_init(void);
void kirkwood_xor1_init(void);
void kirkwood_crypto_init(void);
diff --git a/drivers/watchdog/orion_wdt.c b/drivers/watchdog/orion_wdt.c
index 4ad78f8..4be76ca 100644
--- a/drivers/watchdog/orion_wdt.c
+++ b/drivers/watchdog/orion_wdt.c
@@ -17,6 +17,7 @@
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/platform_device.h>
+#include <linux/of.h>
#include <linux/watchdog.h>
#include <linux/init.h>
#include <linux/uaccess.h>
@@ -28,9 +29,9 @@
/*
* Watchdog timer block registers.
*/
-#define TIMER_CTRL (TIMER_VIRT_BASE + 0x0000)
+#define TIMER_CTRL 0x0000
#define WDT_EN 0x0010
-#define WDT_VAL (TIMER_VIRT_BASE + 0x0024)
+#define WDT_VAL 0x0024
#define WDT_MAX_CYCLE_COUNT 0xffffffff
#define WDT_IN_USE 0
@@ -40,6 +41,7 @@ static int nowayout = WATCHDOG_NOWAYOUT;
static int heartbeat = -1; /* module parameter (seconds) */
static unsigned int wdt_max_duration; /* (seconds) */
static unsigned int wdt_tclk;
+static unsigned int wdt_reg;
static unsigned long wdt_status;
static DEFINE_SPINLOCK(wdt_lock);
@@ -48,7 +50,7 @@ static void orion_wdt_ping(void)
spin_lock(&wdt_lock);
/* Reload watchdog duration */
- writel(wdt_tclk * heartbeat, WDT_VAL);
+ writel(wdt_tclk * heartbeat, wdt_reg + WDT_VAL);
spin_unlock(&wdt_lock);
}
@@ -60,7 +62,7 @@ static void orion_wdt_enable(void)
spin_lock(&wdt_lock);
/* Set watchdog duration */
- writel(wdt_tclk * heartbeat, WDT_VAL);
+ writel(wdt_tclk * heartbeat, wdt_reg + WDT_VAL);
/* Clear watchdog timer interrupt */
reg = readl(BRIDGE_CAUSE);
@@ -68,9 +70,9 @@ static void orion_wdt_enable(void)
writel(reg, BRIDGE_CAUSE);
/* Enable watchdog timer */
- reg = readl(TIMER_CTRL);
+ reg = readl(wdt_reg + TIMER_CTRL);
reg |= WDT_EN;
- writel(reg, TIMER_CTRL);
+ writel(reg, wdt_reg + TIMER_CTRL);
/* Enable reset on watchdog */
reg = readl(RSTOUTn_MASK);
@@ -92,9 +94,9 @@ static void orion_wdt_disable(void)
writel(reg, RSTOUTn_MASK);
/* Disable watchdog timer */
- reg = readl(TIMER_CTRL);
+ reg = readl(wdt_reg + TIMER_CTRL);
reg &= ~WDT_EN;
- writel(reg, TIMER_CTRL);
+ writel(reg, wdt_reg + TIMER_CTRL);
spin_unlock(&wdt_lock);
}
@@ -102,7 +104,7 @@ static void orion_wdt_disable(void)
static int orion_wdt_get_timeleft(int *time_left)
{
spin_lock(&wdt_lock);
- *time_left = readl(WDT_VAL) / wdt_tclk;
+ *time_left = readl(wdt_reg + WDT_VAL) / wdt_tclk;
spin_unlock(&wdt_lock);
return 0;
}
@@ -236,15 +238,23 @@ static struct miscdevice orion_wdt_miscdev = {
static int __devinit orion_wdt_probe(struct platform_device *pdev)
{
struct orion_wdt_platform_data *pdata = pdev->dev.platform_data;
+ struct device_node *np = pdev->dev.of_node;
int ret;
- if (pdata) {
+ if (pdata)
wdt_tclk = pdata->tclk;
- } else {
- printk(KERN_ERR "Orion Watchdog misses platform data\n");
+
+ of_property_read_u32(np, "clock-frequency", &wdt_tclk);
+
+ if (!wdt_tclk) {
+ printk(KERN_ERR "Orion Watchdog can't get clock freq\n");
return -ENODEV;
}
+ wdt_reg = TIMER_VIRT_BASE;
+
+ of_property_read_u32(np, "reg", &wdt_reg);
+
if (orion_wdt_miscdev.parent)
return -EBUSY;
orion_wdt_miscdev.parent = &pdev->dev;
@@ -284,6 +294,15 @@ static void orion_wdt_shutdown(struct platform_device *pdev)
orion_wdt_disable();
}
+#ifdef CONFIG_OF
+static struct of_device_id orion_wdt_of_match_table[] = {
+ { .compatible = "marvell,orion-wdt", },
+ {},
+};
+#else
+#define orion_wdt_of_match_table NULL
+#endif
+
static struct platform_driver orion_wdt_driver = {
.probe = orion_wdt_probe,
.remove = __devexit_p(orion_wdt_remove),
@@ -291,6 +310,7 @@ static struct platform_driver orion_wdt_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "orion_wdt",
+ .of_match_table = orion_wdt_of_match_table,
},
};
--
1.7.3.4
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