AT91: Convert WDT driver to be independent of processor base-address
Andrew Victor
avictor.za at gmail.com
Fri Apr 29 16:48:10 EDT 2011
For supporting multiple AT91 processors in a single kernel image, the
following changes to the WDT driver support:
* pass base addresses via platform resources
* replace calls to at91_sys_read() / at91_sys_write()
* rename AT91_WDT to AT91xxx_WDT to denote they are processor-specific
definitions.
Signed-off-by: Andrew Victor <linux at maxim.org.za>
diff --git a/arch/arm/mach-at91/at572d940hf_devices.c b/arch/arm/mach-at91/at572d940hf_devices.c
index a3534e3..9e7e513 100644
--- a/arch/arm/mach-at91/at572d940hf_devices.c
+++ b/arch/arm/mach-at91/at572d940hf_devices.c
@@ -628,10 +628,20 @@ static void __init at91_add_device_rtt(void)
* -------------------------------------------------------------------- */
#if defined(CONFIG_AT91SAM9X_WATCHDOG) || defined(CONFIG_AT91SAM9X_WATCHDOG_MODULE)
+
+static struct resource wdt_resources[] = {
+ {
+ .start = AT91_VA_BASE_SYS + AT572D940HF_WDT,
+ .end = AT91_VA_BASE_SYS + AT572D940HF_WDT + SZ_16 - 1,
+ .flags = IORESOURCE_MEM,
+ }
+};
+
static struct platform_device at572d940hf_wdt_device = {
.name = "at91_wdt",
.id = -1,
- .num_resources = 0,
+ .resource = wdt_resources,
+ .num_resources = ARRAY_SIZE(wdt_resources),
};
static void __init at91_add_device_watchdog(void)
diff --git a/arch/arm/mach-at91/at91cap9_devices.c b/arch/arm/mach-at91/at91cap9_devices.c
index f20a31d..d7ba0f2 100644
--- a/arch/arm/mach-at91/at91cap9_devices.c
+++ b/arch/arm/mach-at91/at91cap9_devices.c
@@ -698,10 +698,20 @@ static void __init at91_add_device_rtt(void)
* -------------------------------------------------------------------- */
#if defined(CONFIG_AT91SAM9X_WATCHDOG) || defined(CONFIG_AT91SAM9X_WATCHDOG_MODULE)
+
+static struct resource wdt_resources[] = {
+ {
+ .start = AT91_VA_BASE_SYS + AT91CAP9_WDT,
+ .end = AT91_VA_BASE_SYS + AT91CAP9_WDT + SZ_16 - 1,
+ .flags = IORESOURCE_MEM,
+ }
+};
+
static struct platform_device at91cap9_wdt_device = {
.name = "at91_wdt",
.id = -1,
- .num_resources = 0,
+ .resource = wdt_resources,
+ .num_resources = ARRAY_SIZE(wdt_resources),
};
static void __init at91_add_device_watchdog(void)
diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
index fa783c7..652a2f9 100644
--- a/arch/arm/mach-at91/at91sam9260_devices.c
+++ b/arch/arm/mach-at91/at91sam9260_devices.c
@@ -740,10 +740,20 @@ static void __init at91_add_device_rtt(void)
* -------------------------------------------------------------------- */
#if defined(CONFIG_AT91SAM9X_WATCHDOG) || defined(CONFIG_AT91SAM9X_WATCHDOG_MODULE)
+
+static struct resource wdt_resources[] = {
+ {
+ .start = AT91_VA_BASE_SYS + AT91SAM9260_WDT,
+ .end = AT91_VA_BASE_SYS + AT91SAM9260_WDT + SZ_16 - 1,
+ .flags = IORESOURCE_MEM,
+ }
+};
+
static struct platform_device at91sam9260_wdt_device = {
.name = "at91_wdt",
.id = -1,
- .num_resources = 0,
+ .resource = wdt_resources,
+ .num_resources = ARRAY_SIZE(wdt_resources),
};
static void __init at91_add_device_watchdog(void)
diff --git a/arch/arm/mach-at91/at91sam9261_devices.c b/arch/arm/mach-at91/at91sam9261_devices.c
index f8a6bc9..c0bfcb6 100644
--- a/arch/arm/mach-at91/at91sam9261_devices.c
+++ b/arch/arm/mach-at91/at91sam9261_devices.c
@@ -622,10 +622,20 @@ static void __init at91_add_device_rtt(void)
* -------------------------------------------------------------------- */
#if defined(CONFIG_AT91SAM9X_WATCHDOG) || defined(CONFIG_AT91SAM9X_WATCHDOG_MODULE)
+
+static struct resource wdt_resources[] = {
+ {
+ .start = AT91_VA_BASE_SYS + AT91SAM9261_WDT,
+ .end = AT91_VA_BASE_SYS + AT91SAM9261_WDT + SZ_16 - 1,
+ .flags = IORESOURCE_MEM,
+ }
+};
+
static struct platform_device at91sam9261_wdt_device = {
.name = "at91_wdt",
.id = -1,
- .num_resources = 0,
+ .resource = wdt_resources,
+ .num_resources = ARRAY_SIZE(wdt_resources),
};
static void __init at91_add_device_watchdog(void)
diff --git a/arch/arm/mach-at91/at91sam9263_devices.c b/arch/arm/mach-at91/at91sam9263_devices.c
index 5a8fb39..575b843 100644
--- a/arch/arm/mach-at91/at91sam9263_devices.c
+++ b/arch/arm/mach-at91/at91sam9263_devices.c
@@ -996,10 +996,20 @@ static void __init at91_add_device_rtt(void)
* -------------------------------------------------------------------- */
#if defined(CONFIG_AT91SAM9X_WATCHDOG) || defined(CONFIG_AT91SAM9X_WATCHDOG_MODULE)
+
+static struct resource wdt_resources[] = {
+ {
+ .start = AT91_VA_BASE_SYS + AT91SAM9263_WDT,
+ .end = AT91_VA_BASE_SYS + AT91SAM9263_WDT + SZ_16 - 1,
+ .flags = IORESOURCE_MEM,
+ }
+};
+
static struct platform_device at91sam9263_wdt_device = {
.name = "at91_wdt",
.id = -1,
- .num_resources = 0,
+ .resource = wdt_resources,
+ .num_resources = ARRAY_SIZE(wdt_resources),
};
static void __init at91_add_device_watchdog(void)
diff --git a/arch/arm/mach-at91/at91sam9g45_devices.c b/arch/arm/mach-at91/at91sam9g45_devices.c
index 464d7ff..c8d9094 100644
--- a/arch/arm/mach-at91/at91sam9g45_devices.c
+++ b/arch/arm/mach-at91/at91sam9g45_devices.c
@@ -1120,10 +1120,20 @@ static void __init at91_add_device_rtt(void)
* -------------------------------------------------------------------- */
#if defined(CONFIG_AT91SAM9X_WATCHDOG) || defined(CONFIG_AT91SAM9X_WATCHDOG_MODULE)
+
+static struct resource wdt_resources[] = {
+ {
+ .start = AT91_VA_BASE_SYS + AT91SAM9G45_WDT,
+ .end = AT91_VA_BASE_SYS + AT91SAM9G45_WDT + SZ_16 - 1,
+ .flags = IORESOURCE_MEM,
+ }
+};
+
static struct platform_device at91sam9g45_wdt_device = {
.name = "at91_wdt",
.id = -1,
- .num_resources = 0,
+ .resource = wdt_resources,
+ .num_resources = ARRAY_SIZE(wdt_resources),
};
static void __init at91_add_device_watchdog(void)
diff --git a/arch/arm/mach-at91/at91sam9rl_devices.c b/arch/arm/mach-at91/at91sam9rl_devices.c
index 72effd4..08bc4fa 100644
--- a/arch/arm/mach-at91/at91sam9rl_devices.c
+++ b/arch/arm/mach-at91/at91sam9rl_devices.c
@@ -726,10 +726,20 @@ static void __init at91_add_device_rtt(void)
* -------------------------------------------------------------------- */
#if defined(CONFIG_AT91SAM9X_WATCHDOG) || defined(CONFIG_AT91SAM9X_WATCHDOG_MODULE)
+
+static struct resource wdt_resources[] = {
+ {
+ .start = AT91_VA_BASE_SYS + AT91SAM9RL_WDT,
+ .end = AT91_VA_BASE_SYS + AT91SAM9RL_WDT + SZ_16 - 1,
+ .flags = IORESOURCE_MEM,
+ }
+};
+
static struct platform_device at91sam9rl_wdt_device = {
.name = "at91_wdt",
.id = -1,
- .num_resources = 0,
+ .resource = wdt_resources,
+ .num_resources = ARRAY_SIZE(wdt_resources),
};
static void __init at91_add_device_watchdog(void)
diff --git a/arch/arm/mach-at91/include/mach/at572d940hf.h b/arch/arm/mach-at91/include/mach/at572d940hf.h
index b714a84..e5aba13 100644
--- a/arch/arm/mach-at91/include/mach/at572d940hf.h
+++ b/arch/arm/mach-at91/include/mach/at572d940hf.h
@@ -101,7 +101,7 @@
#define AT91_RSTC (0xfffffd00 - AT91_BASE_SYS)
#define AT572D940HF_RTT (0xfffffd20 - AT91_BASE_SYS)
#define AT91_PIT (0xfffffd30 - AT91_BASE_SYS)
-#define AT91_WDT (0xfffffd40 - AT91_BASE_SYS)
+#define AT572D940HF_WDT (0xfffffd40 - AT91_BASE_SYS)
#define AT91_USART0 AT572D940HF_ID_US0
#define AT91_USART1 AT572D940HF_ID_US1
diff --git a/arch/arm/mach-at91/include/mach/at91_wdt.h b/arch/arm/mach-at91/include/mach/at91_wdt.h
index fecc2e9..d4ec83a 100644
--- a/arch/arm/mach-at91/include/mach/at91_wdt.h
+++ b/arch/arm/mach-at91/include/mach/at91_wdt.h
@@ -16,11 +16,11 @@
#ifndef AT91_WDT_H
#define AT91_WDT_H
-#define AT91_WDT_CR (AT91_WDT + 0x00) /* Watchdog Control Register */
+#define AT91_WDT_CR 0x00 /* Watchdog Control Register */
#define AT91_WDT_WDRSTT (1 << 0) /* Restart */
#define AT91_WDT_KEY (0xa5 << 24) /* KEY Password */
-#define AT91_WDT_MR (AT91_WDT + 0x04) /* Watchdog Mode Register */
+#define AT91_WDT_MR 0x04 /* Watchdog Mode Register */
#define AT91_WDT_WDV (0xfff << 0) /* Counter Value */
#define AT91_WDT_WDFIEN (1 << 12) /* Fault Interrupt Enable */
#define AT91_WDT_WDRSTEN (1 << 13) /* Reset Processor */
@@ -30,7 +30,7 @@
#define AT91_WDT_WDDBGHLT (1 << 28) /* Debug Halt */
#define AT91_WDT_WDIDLEHLT (1 << 29) /* Idle Halt */
-#define AT91_WDT_SR (AT91_WDT + 0x08) /* Watchdog Status Register */
+#define AT91_WDT_SR 0x08 /* Watchdog Status Register */
#define AT91_WDT_WDUNF (1 << 0) /* Watchdog Underflow */
#define AT91_WDT_WDERR (1 << 1) /* Watchdog Error */
diff --git a/arch/arm/mach-at91/include/mach/at91cap9.h b/arch/arm/mach-at91/include/mach/at91cap9.h
index a1776a0..95876d5 100644
--- a/arch/arm/mach-at91/include/mach/at91cap9.h
+++ b/arch/arm/mach-at91/include/mach/at91cap9.h
@@ -100,7 +100,7 @@
#define AT91_SHDWC (0xfffffd10 - AT91_BASE_SYS)
#define AT91CAP9_RTT (0xfffffd20 - AT91_BASE_SYS)
#define AT91_PIT (0xfffffd30 - AT91_BASE_SYS)
-#define AT91_WDT (0xfffffd40 - AT91_BASE_SYS)
+#define AT91CAP9_WDT (0xfffffd40 - AT91_BASE_SYS)
#define AT91_GPBR (cpu_is_at91cap9_revB() ? \
(0xfffffd50 - AT91_BASE_SYS) : \
(0xfffffd60 - AT91_BASE_SYS))
diff --git a/arch/arm/mach-at91/include/mach/at91sam9260.h b/arch/arm/mach-at91/include/mach/at91sam9260.h
index 53e715a..3e35785 100644
--- a/arch/arm/mach-at91/include/mach/at91sam9260.h
+++ b/arch/arm/mach-at91/include/mach/at91sam9260.h
@@ -98,7 +98,7 @@
#define AT91_SHDWC (0xfffffd10 - AT91_BASE_SYS)
#define AT91SAM9260_RTT (0xfffffd20 - AT91_BASE_SYS)
#define AT91_PIT (0xfffffd30 - AT91_BASE_SYS)
-#define AT91_WDT (0xfffffd40 - AT91_BASE_SYS)
+#define AT91SAM9260_WDT (0xfffffd40 - AT91_BASE_SYS)
#define AT91_GPBR (0xfffffd50 - AT91_BASE_SYS)
#define AT91_USART0 AT91SAM9260_BASE_US0
diff --git a/arch/arm/mach-at91/include/mach/at91sam9261.h b/arch/arm/mach-at91/include/mach/at91sam9261.h
index 5e633ae..5ff812f 100644
--- a/arch/arm/mach-at91/include/mach/at91sam9261.h
+++ b/arch/arm/mach-at91/include/mach/at91sam9261.h
@@ -81,7 +81,7 @@
#define AT91_SHDWC (0xfffffd10 - AT91_BASE_SYS)
#define AT91SAM9261_RTT (0xfffffd20 - AT91_BASE_SYS)
#define AT91_PIT (0xfffffd30 - AT91_BASE_SYS)
-#define AT91_WDT (0xfffffd40 - AT91_BASE_SYS)
+#define AT91SAM9261_WDT (0xfffffd40 - AT91_BASE_SYS)
#define AT91_GPBR (0xfffffd50 - AT91_BASE_SYS)
#define AT91_USART0 AT91SAM9261_BASE_US0
diff --git a/arch/arm/mach-at91/include/mach/at91sam9263.h b/arch/arm/mach-at91/include/mach/at91sam9263.h
index c12514f..88994a2 100644
--- a/arch/arm/mach-at91/include/mach/at91sam9263.h
+++ b/arch/arm/mach-at91/include/mach/at91sam9263.h
@@ -97,7 +97,7 @@
#define AT91_SHDWC (0xfffffd10 - AT91_BASE_SYS)
#define AT91SAM9263_RTT0 (0xfffffd20 - AT91_BASE_SYS)
#define AT91_PIT (0xfffffd30 - AT91_BASE_SYS)
-#define AT91_WDT (0xfffffd40 - AT91_BASE_SYS)
+#define AT91SAM9263_WDT (0xfffffd40 - AT91_BASE_SYS)
#define AT91SAM9263_RTT1 (0xfffffd50 - AT91_BASE_SYS)
#define AT91_GPBR (0xfffffd60 - AT91_BASE_SYS)
diff --git a/arch/arm/mach-at91/include/mach/at91sam9g45.h b/arch/arm/mach-at91/include/mach/at91sam9g45.h
index 6c42060..f1bb0a7 100644
--- a/arch/arm/mach-at91/include/mach/at91sam9g45.h
+++ b/arch/arm/mach-at91/include/mach/at91sam9g45.h
@@ -107,7 +107,7 @@
#define AT91_SHDWC (0xfffffd10 - AT91_BASE_SYS)
#define AT91SAM9G45_RTT (0xfffffd20 - AT91_BASE_SYS)
#define AT91_PIT (0xfffffd30 - AT91_BASE_SYS)
-#define AT91_WDT (0xfffffd40 - AT91_BASE_SYS)
+#define AT91SAM9G45_WDT (0xfffffd40 - AT91_BASE_SYS)
#define AT91_GPBR (0xfffffd60 - AT91_BASE_SYS)
#define AT91SAM9G45_RTC (0xfffffdb0 - AT91_BASE_SYS)
diff --git a/arch/arm/mach-at91/include/mach/at91sam9rl.h b/arch/arm/mach-at91/include/mach/at91sam9rl.h
index 003e0b5..f153a77 100644
--- a/arch/arm/mach-at91/include/mach/at91sam9rl.h
+++ b/arch/arm/mach-at91/include/mach/at91sam9rl.h
@@ -89,7 +89,7 @@
#define AT91_SHDWC (0xfffffd10 - AT91_BASE_SYS)
#define AT91SAM9RL_RTT (0xfffffd20 - AT91_BASE_SYS)
#define AT91_PIT (0xfffffd30 - AT91_BASE_SYS)
-#define AT91_WDT (0xfffffd40 - AT91_BASE_SYS)
+#define AT91SAM9RL_WDT (0xfffffd40 - AT91_BASE_SYS)
#define AT91_SCKCR (0xfffffd50 - AT91_BASE_SYS)
#define AT91_GPBR (0xfffffd60 - AT91_BASE_SYS)
#define AT91SAM9RL_RTC (0xfffffe00 - AT91_BASE_SYS)
diff --git a/drivers/watchdog/at91sam9_wdt.c b/drivers/watchdog/at91sam9_wdt.c
index eac2602..a7a63e9 100644
--- a/drivers/watchdog/at91sam9_wdt.c
+++ b/drivers/watchdog/at91sam9_wdt.c
@@ -67,6 +67,7 @@ static struct {
unsigned long open;
char expect_close;
struct timer_list timer; /* The timer that pings the watchdog */
+ void __iomem *regbase; /* base address of WDT */
} at91wdt_private;
/* ......................................................................... */
@@ -77,7 +78,8 @@ static struct {
*/
static inline void at91_wdt_reset(void)
{
- at91_sys_write(AT91_WDT_CR, AT91_WDT_KEY | AT91_WDT_WDRSTT);
+ __raw_writel(AT91_WDT_KEY | AT91_WDT_WDRSTT,
+ at91wdt_private.regbase + AT91_WDT_CR);
}
/*
@@ -132,7 +134,7 @@ static int at91_wdt_settimeout(unsigned int timeout)
unsigned int mr;
/* Check if disabled */
- mr = at91_sys_read(AT91_WDT_MR);
+ mr = __raw_readl(at91wdt_private.regbase + AT91_WDT_MR);
if (mr & AT91_WDT_WDDIS) {
printk(KERN_ERR DRV_NAME": sorry, watchdog is disabled\n");
return -EIO;
@@ -149,7 +151,7 @@ static int at91_wdt_settimeout(unsigned int timeout)
| AT91_WDT_WDDBGHLT /* disabled in debug mode */
| AT91_WDT_WDD /* restart at any time */
| (timeout & AT91_WDT_WDV); /* timer value */
- at91_sys_write(AT91_WDT_MR, reg);
+ __raw_writel(reg, at91wdt_private.regbase + AT91_WDT_MR);
return 0;
}
@@ -248,11 +250,17 @@ static struct miscdevice at91wdt_miscdev = {
static int __init at91wdt_probe(struct platform_device *pdev)
{
+ struct resource *r;
int res;
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!r)
+ return -ENODEV;
+
if (at91wdt_miscdev.parent)
return -EBUSY;
at91wdt_miscdev.parent = &pdev->dev;
+ at91wdt_private.regbase = (void __force __iomem *) r->start;
/* Set watchdog */
res = at91_wdt_settimeout(ms_to_ticks(WDT_HW_TIMEOUT * 1000));
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