Davinci: watchdog reset separation across socs

The earlier watchdog reset mechanism had a couple of limitations.  First, it
embedded a reference to "davinci_wdt_device" inside common code.  This
forced all derived platforms (da8xx and tnetv107x) to define such a device.
This also would have caused problems in including multiple socs in a single
build due to symbol redefinition.

With this patch, davinci_watchdog_reset() now takes the platform device as an
argument.  The davinci_soc_info struct has been extended to include a reset
function and a watchdog platform_device.  arch_reset() then uses these
elements to reset the system in a SoC specific fashion.

Signed-off-by: Cyril Chemparathy <cyril@ti.com>
Tested-by: Sandeep Paulraj <s-paulraj@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

arch/arm/mach-davinci/clock.h

@@ -120,6 +120,7 @@ int davinci_set_pllrate(struct pll_data *pll, unsigned int prediv,
 				unsigned int mult, unsigned int postdiv);
 
 extern struct platform_device davinci_wdt_device;
+extern void davinci_watchdog_reset(struct platform_device *);
 
 #endif
 

arch/arm/mach-davinci/common.c

@@ -77,6 +77,9 @@ void __init davinci_common_init(struct davinci_soc_info *soc_info)
 	local_flush_tlb_all();
 	flush_cache_all();
 
+	if (!davinci_soc_info.reset)
+		davinci_soc_info.reset = davinci_watchdog_reset;
+
 	/*
 	 * We want to check CPU revision early for cpu_is_xxxx() macros.
 	 * IO space mapping must be initialized before we can do that.

arch/arm/mach-davinci/da830.c

@@ -1206,6 +1206,7 @@ static struct davinci_soc_info davinci_soc_info_da830 = {
 	.gpio_irq		= IRQ_DA8XX_GPIO0,
 	.serial_dev		= &da8xx_serial_device,
 	.emac_pdata		= &da8xx_emac_pdata,
+	.reset_device		= &da8xx_wdt_device,
 };
 
 void __init da830_init(void)

arch/arm/mach-davinci/da850.c

@@ -1093,6 +1093,7 @@ static struct davinci_soc_info davinci_soc_info_da850 = {
 	.emac_pdata		= &da8xx_emac_pdata,
 	.sram_dma		= DA8XX_ARM_RAM_BASE,
 	.sram_len		= SZ_8K,
+	.reset_device		= &da8xx_wdt_device,
 };
 
 void __init da850_init(void)

arch/arm/mach-davinci/devices-da8xx.c

@@ -326,7 +326,7 @@ static struct resource da8xx_watchdog_resources[] = {
 	},
 };
 
-struct platform_device davinci_wdt_device = {
+struct platform_device da8xx_wdt_device = {
 	.name		= "watchdog",
 	.id		= -1,
 	.num_resources	= ARRAY_SIZE(da8xx_watchdog_resources),
@@ -335,7 +335,7 @@ struct platform_device davinci_wdt_device = {
 
 int __init da8xx_register_watchdog(void)
 {
-	return platform_device_register(&davinci_wdt_device);
+	return platform_device_register(&da8xx_wdt_device);
 }
 
 static struct resource da8xx_emac_resources[] = {

arch/arm/mach-davinci/dm355.c

@@ -861,6 +861,7 @@ static struct davinci_soc_info davinci_soc_info_dm355 = {
 	.serial_dev		= &dm355_serial_device,
 	.sram_dma		= 0x00010000,
 	.sram_len		= SZ_32K,
+	.reset_device		= &davinci_wdt_device,
 };
 
 void __init dm355_init_asp1(u32 evt_enable, struct snd_platform_data *pdata)

arch/arm/mach-davinci/dm365.c

@@ -1068,6 +1068,7 @@ static struct davinci_soc_info davinci_soc_info_dm365 = {
 	.emac_pdata		= &dm365_emac_pdata,
 	.sram_dma		= 0x00010000,
 	.sram_len		= SZ_32K,
+	.reset_device		= &davinci_wdt_device,
 };
 
 void __init dm365_init_asp(struct snd_platform_data *pdata)

arch/arm/mach-davinci/dm644x.c

@@ -753,6 +753,7 @@ static struct davinci_soc_info davinci_soc_info_dm644x = {
 	.emac_pdata		= &dm644x_emac_pdata,
 	.sram_dma		= 0x00008000,
 	.sram_len		= SZ_16K,
+	.reset_device		= &davinci_wdt_device,
 };
 
 void __init dm644x_init_asp(struct snd_platform_data *pdata)

arch/arm/mach-davinci/dm646x.c

@@ -837,6 +837,7 @@ static struct davinci_soc_info davinci_soc_info_dm646x = {
 	.emac_pdata		= &dm646x_emac_pdata,
 	.sram_dma		= 0x10010000,
 	.sram_len		= SZ_32K,
+	.reset_device		= &davinci_wdt_device,
 };
 
 void __init dm646x_init_mcasp0(struct snd_platform_data *pdata)

arch/arm/mach-davinci/include/mach/common.h

@@ -70,6 +70,8 @@ struct davinci_soc_info {
 	struct emac_platform_data	*emac_pdata;
 	dma_addr_t			sram_dma;
 	unsigned			sram_len;
+	struct platform_device		*reset_device;
+	void				(*reset)(struct platform_device *);
 };
 
 extern struct davinci_soc_info davinci_soc_info;

arch/arm/mach-davinci/include/mach/da8xx.h

@@ -87,6 +87,8 @@ extern struct emac_platform_data da8xx_emac_pdata;
 extern struct da8xx_lcdc_platform_data sharp_lcd035q3dg01_pdata;
 extern struct da8xx_lcdc_platform_data sharp_lk043t1dg01_pdata;
 
+extern struct platform_device da8xx_wdt_device;
+
 extern const short da830_emif25_pins[];
 extern const short da830_spi0_pins[];
 extern const short da830_spi1_pins[];

arch/arm/mach-davinci/include/mach/system.h

@@ -11,7 +11,7 @@
 #ifndef __ASM_ARCH_SYSTEM_H
 #define __ASM_ARCH_SYSTEM_H
 
-extern void davinci_watchdog_reset(void);
+#include <mach/common.h>
 
 static inline void arch_idle(void)
 {
@@ -20,7 +20,8 @@ static inline void arch_idle(void)
 
 static inline void arch_reset(char mode, const char *cmd)
 {
-	davinci_watchdog_reset();
+	if (davinci_soc_info.reset)
+		davinci_soc_info.reset(davinci_soc_info.reset_device);
 }
 
 #endif /* __ASM_ARCH_SYSTEM_H */

arch/arm/mach-davinci/time.c

@@ -399,13 +399,16 @@ struct sys_timer davinci_timer = {
 
 
 /* reset board using watchdog timer */
-void davinci_watchdog_reset(void)
+void davinci_watchdog_reset(struct platform_device *pdev)
 {
 	u32 tgcr, wdtcr;
-	struct platform_device *pdev = &davinci_wdt_device;
-	void __iomem *base = IO_ADDRESS(pdev->resource[0].start);
+	void __iomem *base;
 	struct clk *wd_clk;
 
+	base = ioremap(pdev->resource[0].start, SZ_4K);
+	if (WARN_ON(!base))
+		return;
+
 	wd_clk = clk_get(&pdev->dev, NULL);
 	if (WARN_ON(IS_ERR(wd_clk)))
 		return;