diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/Kconfig | 3 | ||||
| -rw-r--r-- | arch/arm/mach-exynos/include/mach/uncompress.h | 3 | ||||
| -rw-r--r-- | arch/arm/mach-s3c24xx/Kconfig | 2 | ||||
| -rw-r--r-- | arch/arm/mach-s3c24xx/include/mach/uncompress.h | 3 | ||||
| -rw-r--r-- | arch/arm/mach-s3c24xx/s3c2410.c | 3 | ||||
| -rw-r--r-- | arch/arm/mach-s3c24xx/s3c244x.c | 3 | ||||
| -rw-r--r-- | arch/arm/mach-s3c64xx/common.c | 8 | ||||
| -rw-r--r-- | arch/arm/mach-s3c64xx/include/mach/uncompress.h | 3 | ||||
| -rw-r--r-- | arch/arm/mach-s5p64x0/common.c | 4 | ||||
| -rw-r--r-- | arch/arm/mach-s5p64x0/include/mach/uncompress.h | 162 | ||||
| -rw-r--r-- | arch/arm/mach-s5pc100/common.c | 3 | ||||
| -rw-r--r-- | arch/arm/mach-s5pc100/include/mach/uncompress.h | 2 | ||||
| -rw-r--r-- | arch/arm/mach-s5pv210/include/mach/uncompress.h | 2 | ||||
| -rw-r--r-- | arch/arm/plat-samsung/Kconfig | 6 | ||||
| -rw-r--r-- | arch/arm/plat-samsung/Makefile | 1 | ||||
| -rw-r--r-- | arch/arm/plat-samsung/include/plat/regs-watchdog.h | 41 | ||||
| -rw-r--r-- | arch/arm/plat-samsung/include/plat/uncompress.h | 21 | ||||
| -rw-r--r-- | arch/arm/plat-samsung/include/plat/watchdog-reset.h | 38 | ||||
| -rw-r--r-- | arch/arm/plat-samsung/watchdog-reset.c | 97 |
19 files changed, 161 insertions, 244 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 49d993cee512..40f63f4e9e54 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -729,6 +729,7 @@ config ARCH_S3C64XX select SAMSUNG_CLKSRC select SAMSUNG_GPIOLIB_4BIT select SAMSUNG_IRQ_VIC_TIMER + select SAMSUNG_WDT_RESET select USB_ARCH_HAS_OHCI help Samsung S3C64XX series based systems @@ -744,6 +745,7 @@ config ARCH_S5P64X0 select HAVE_S3C2410_WATCHDOG if WATCHDOG select HAVE_S3C_RTC if RTC_CLASS select NEED_MACH_GPIO_H + select SAMSUNG_WDT_RESET help Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440, SMDK6450. @@ -760,6 +762,7 @@ config ARCH_S5PC100 select HAVE_S3C2410_WATCHDOG if WATCHDOG select HAVE_S3C_RTC if RTC_CLASS select NEED_MACH_GPIO_H + select SAMSUNG_WDT_RESET help Samsung S5PC100 series based systems diff --git a/arch/arm/mach-exynos/include/mach/uncompress.h b/arch/arm/mach-exynos/include/mach/uncompress.h index 2979995d5a6a..d405762be183 100644 --- a/arch/arm/mach-exynos/include/mach/uncompress.h +++ b/arch/arm/mach-exynos/include/mach/uncompress.h @@ -15,9 +15,6 @@ #include <asm/mach-types.h> #include <mach/map.h> - -volatile u8 *uart_base; - #include <plat/uncompress.h> static unsigned int __raw_readl(unsigned int ptr) diff --git a/arch/arm/mach-s3c24xx/Kconfig b/arch/arm/mach-s3c24xx/Kconfig index f2f7088bfd22..f8d1912f103e 100644 --- a/arch/arm/mach-s3c24xx/Kconfig +++ b/arch/arm/mach-s3c24xx/Kconfig @@ -31,6 +31,7 @@ config CPU_S3C2410 select S3C2410_CPUFREQ if CPU_FREQ_S3C24XX select S3C2410_PM if PM select SAMSUNG_HRT + select SAMSUNG_WDT_RESET help Support for S3C2410 and S3C2410A family from the S3C24XX line of Samsung Mobile CPUs. @@ -81,6 +82,7 @@ config CPU_S3C2442 config CPU_S3C244X def_bool y depends on CPU_S3C2440 || CPU_S3C2442 + select SAMSUNG_WDT_RESET config CPU_S3C2443 bool "SAMSUNG S3C2443" diff --git a/arch/arm/mach-s3c24xx/include/mach/uncompress.h b/arch/arm/mach-s3c24xx/include/mach/uncompress.h index 8b283f847daa..7d2ce205dce8 100644 --- a/arch/arm/mach-s3c24xx/include/mach/uncompress.h +++ b/arch/arm/mach-s3c24xx/include/mach/uncompress.h @@ -49,6 +49,9 @@ static void arch_detect_cpu(void) fifo_mask = S3C2410_UFSTAT_TXMASK; fifo_max = 15 << S3C2410_UFSTAT_TXSHIFT; } + + uart_base = (volatile u8 *) S3C_PA_UART + + (S3C_UART_OFFSET * CONFIG_S3C_LOWLEVEL_UART_PORT); } #endif /* __ASM_ARCH_UNCOMPRESS_H */ diff --git a/arch/arm/mach-s3c24xx/s3c2410.c b/arch/arm/mach-s3c24xx/s3c2410.c index d850ea5adac2..ff384acc65b2 100644 --- a/arch/arm/mach-s3c24xx/s3c2410.c +++ b/arch/arm/mach-s3c24xx/s3c2410.c @@ -138,6 +138,7 @@ void __init s3c2410_init_clocks(int xtal) s3c2410_baseclk_add(); s3c24xx_register_clock(&s3c2410_armclk); clkdev_add_table(s3c2410_clk_lookup, ARRAY_SIZE(s3c2410_clk_lookup)); + samsung_wdt_reset_init(S3C24XX_VA_WATCHDOG); } struct bus_type s3c2410_subsys = { @@ -201,7 +202,7 @@ void s3c2410_restart(char mode, const char *cmd) soft_restart(0); } - arch_wdt_reset(); + samsung_wdt_reset(); /* we'll take a jump through zero as a poor second */ soft_restart(0); diff --git a/arch/arm/mach-s3c24xx/s3c244x.c b/arch/arm/mach-s3c24xx/s3c244x.c index 2a35edb67354..d0423e2544c1 100644 --- a/arch/arm/mach-s3c24xx/s3c244x.c +++ b/arch/arm/mach-s3c24xx/s3c244x.c @@ -133,6 +133,7 @@ void __init s3c244x_init_clocks(int xtal) s3c24xx_register_baseclocks(xtal); s3c244x_setup_clocks(); s3c2410_baseclk_add(); + samsung_wdt_reset_init(S3C24XX_VA_WATCHDOG); } /* Since the S3C2442 and S3C2440 share items, put both subsystems here */ @@ -202,7 +203,7 @@ void s3c244x_restart(char mode, const char *cmd) if (mode == 's') soft_restart(0); - arch_wdt_reset(); + samsung_wdt_reset(); /* we'll take a jump through zero as a poor second */ soft_restart(0); diff --git a/arch/arm/mach-s3c64xx/common.c b/arch/arm/mach-s3c64xx/common.c index 0b9c0ba44834..1aed6f4be1ce 100644 --- a/arch/arm/mach-s3c64xx/common.c +++ b/arch/arm/mach-s3c64xx/common.c @@ -183,6 +183,12 @@ core_initcall(s3c64xx_dev_init); void __init s3c64xx_init_irq(u32 vic0_valid, u32 vic1_valid) { + /* + * FIXME: there is no better place to put this at the moment + * (samsung_wdt_reset_init needs clocks) + */ + samsung_wdt_reset_init(S3C_VA_WATCHDOG); + printk(KERN_DEBUG "%s: initialising interrupts\n", __func__); /* initialise the pair of VICs */ @@ -378,7 +384,7 @@ arch_initcall(s3c64xx_init_irq_eint); void s3c64xx_restart(char mode, const char *cmd) { if (mode != 's') - arch_wdt_reset(); + samsung_wdt_reset(); /* if all else fails, or mode was for soft, jump to 0 */ soft_restart(0); diff --git a/arch/arm/mach-s3c64xx/include/mach/uncompress.h b/arch/arm/mach-s3c64xx/include/mach/uncompress.h index c6a82a20bf2a..1c956738b42d 100644 --- a/arch/arm/mach-s3c64xx/include/mach/uncompress.h +++ b/arch/arm/mach-s3c64xx/include/mach/uncompress.h @@ -23,6 +23,9 @@ static void arch_detect_cpu(void) /* we do not need to do any cpu detection here at the moment. */ fifo_mask = S3C2440_UFSTAT_TXMASK; fifo_max = 63 << S3C2440_UFSTAT_TXSHIFT; + + uart_base = (volatile u8 *)S3C_PA_UART + + (S3C_UART_OFFSET * CONFIG_S3C_LOWLEVEL_UART_PORT); } #endif /* __ASM_ARCH_UNCOMPRESS_H */ diff --git a/arch/arm/mach-s5p64x0/common.c b/arch/arm/mach-s5p64x0/common.c index 8ae5800e807f..76d0053bf564 100644 --- a/arch/arm/mach-s5p64x0/common.c +++ b/arch/arm/mach-s5p64x0/common.c @@ -173,6 +173,8 @@ void __init s5p64x0_init_io(struct map_desc *mach_desc, int size) s5p_init_cpu(S5P64X0_SYS_ID); s3c_init_cpu(samsung_cpu_id, cpu_ids, ARRAY_SIZE(cpu_ids)); + samsung_wdt_reset_init(S3C_VA_WATCHDOG); + } void __init s5p6440_map_io(void) @@ -440,7 +442,7 @@ arch_initcall(s5p64x0_init_irq_eint); void s5p64x0_restart(char mode, const char *cmd) { if (mode != 's') - arch_wdt_reset(); + samsung_wdt_reset(); soft_restart(0); } diff --git a/arch/arm/mach-s5p64x0/include/mach/uncompress.h b/arch/arm/mach-s5p64x0/include/mach/uncompress.h index 19e0d64d78c5..bc04bd5d1a29 100644 --- a/arch/arm/mach-s5p64x0/include/mach/uncompress.h +++ b/arch/arm/mach-s5p64x0/include/mach/uncompress.h @@ -14,171 +14,21 @@ #define __ASM_ARCH_UNCOMPRESS_H #include <mach/map.h> +#include <plat/uncompress.h> -/* - * cannot use commonly <plat/uncompress.h> - * because uart base of S5P6440 and S5P6450 is different - */ - -typedef unsigned int upf_t; /* cannot include linux/serial_core.h */ - -/* uart setup */ - -unsigned int fifo_mask; -unsigned int fifo_max; - -/* forward declerations */ - -static void arch_detect_cpu(void); - -/* defines for UART registers */ - -#include <plat/regs-serial.h> -#include <plat/regs-watchdog.h> - -/* working in physical space... */ -#undef S3C2410_WDOGREG -#define S3C2410_WDOGREG(x) ((S3C24XX_PA_WATCHDOG + (x))) - -/* how many bytes we allow into the FIFO at a time in FIFO mode */ -#define FIFO_MAX (14) - -unsigned long uart_base; - -static __inline__ void get_uart_base(void) +static void arch_detect_cpu(void) { unsigned int chipid; chipid = *(const volatile unsigned int __force *) 0xE0100118; - uart_base = S3C_UART_OFFSET * CONFIG_S3C_LOWLEVEL_UART_PORT; - if ((chipid & 0xff000) == 0x50000) - uart_base += 0xEC800000; + uart_base = S5P6450_PA_UART(CONFIG_S3C_LOWLEVEL_UART_PORT); else - uart_base += 0xEC000000; -} - -static __inline__ void uart_wr(unsigned int reg, unsigned int val) -{ - volatile unsigned int *ptr; - - get_uart_base(); - ptr = (volatile unsigned int *)(reg + uart_base); - *ptr = val; -} - -static __inline__ unsigned int uart_rd(unsigned int reg) -{ - volatile unsigned int *ptr; - - get_uart_base(); - ptr = (volatile unsigned int *)(reg + uart_base); - return *ptr; -} - -/* - * we can deal with the case the UARTs are being run - * in FIFO mode, so that we don't hold up our execution - * waiting for tx to happen... - */ - -static void putc(int ch) -{ - if (uart_rd(S3C2410_UFCON) & S3C2410_UFCON_FIFOMODE) { - int level; - - while (1) { - level = uart_rd(S3C2410_UFSTAT); - level &= fifo_mask; - - if (level < fifo_max) - break; - } - - } else { - /* not using fifos */ - - while ((uart_rd(S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE) != S3C2410_UTRSTAT_TXE) - barrier(); - } + uart_base = S5P6440_PA_UART(CONFIG_S3C_LOWLEVEL_UART_PORT); - /* write byte to transmission register */ - uart_wr(S3C2410_UTXH, ch); -} - -static inline void flush(void) -{ -} - -#define __raw_writel(d, ad) \ - do { \ - *((volatile unsigned int __force *)(ad)) = (d); \ - } while (0) - - -#ifdef CONFIG_S3C_BOOT_ERROR_RESET - -static void arch_decomp_error(const char *x) -{ - putstr("\n\n"); - putstr(x); - putstr("\n\n -- System resetting\n"); - - __raw_writel(0x4000, S3C2410_WTDAT); - __raw_writel(0x4000, S3C2410_WTCNT); - __raw_writel(S3C2410_WTCON_ENABLE | S3C2410_WTCON_DIV128 | S3C2410_WTCON_RSTEN | S3C2410_WTCON_PRESCALE(0x40), S3C2410_WTCON); - - while(1); -} - -#define arch_error arch_decomp_error -#endif - -#ifdef CONFIG_S3C_BOOT_UART_FORCE_FIFO -static inline void arch_enable_uart_fifo(void) -{ - u32 fifocon = uart_rd(S3C2410_UFCON); - - if (!(fifocon & S3C2410_UFCON_FIFOMODE)) { - fifocon |= S3C2410_UFCON_RESETBOTH; - uart_wr(S3C2410_UFCON, fifocon); - - /* wait for fifo reset to complete */ - while (1) { - fifocon = uart_rd(S3C2410_UFCON); - if (!(fifocon & S3C2410_UFCON_RESETBOTH)) - break; - } - } -} -#else -#define arch_enable_uart_fifo() do { } while(0) -#endif - -static void arch_decomp_setup(void) -{ - /* - * we may need to setup the uart(s) here if we are not running - * on an BAST... the BAST will have left the uarts configured - * after calling linux. - */ - - arch_detect_cpu(); - - /* - * Enable the UART FIFOs if they where not enabled and our - * configuration says we should turn them on. - */ - - arch_enable_uart_fifo(); -} - - - -static void arch_detect_cpu(void) -{ - /* we do not need to do any cpu detection here at the moment. */ + fifo_mask = S3C2440_UFSTAT_TXMASK; + fifo_max = 63 << S3C2440_UFSTAT_TXSHIFT; } #endif /* __ASM_ARCH_UNCOMPRESS_H */ diff --git a/arch/arm/mach-s5pc100/common.c b/arch/arm/mach-s5pc100/common.c index cc6e561c9958..511031564d35 100644 --- a/arch/arm/mach-s5pc100/common.c +++ b/arch/arm/mach-s5pc100/common.c @@ -178,6 +178,7 @@ void __init s5pc100_init_clocks(int xtal) s5p_register_clocks(xtal); s5pc100_register_clocks(); s5pc100_setup_clocks(); + samsung_wdt_reset_init(S3C_VA_WATCHDOG); } void __init s5pc100_init_irq(void) @@ -219,7 +220,7 @@ void __init s5pc100_init_uarts(struct s3c2410_uartcfg *cfg, int no) void s5pc100_restart(char mode, const char *cmd) { if (mode != 's') - arch_wdt_reset(); + samsung_wdt_reset(); soft_restart(0); } diff --git a/arch/arm/mach-s5pc100/include/mach/uncompress.h b/arch/arm/mach-s5pc100/include/mach/uncompress.h index 01ccf535e76c..720e1339425c 100644 --- a/arch/arm/mach-s5pc100/include/mach/uncompress.h +++ b/arch/arm/mach-s5pc100/include/mach/uncompress.h @@ -23,6 +23,8 @@ static void arch_detect_cpu(void) /* we do not need to do any cpu detection here at the moment. */ fifo_mask = S3C2440_UFSTAT_TXMASK; fifo_max = 63 << S3C2440_UFSTAT_TXSHIFT; + + uart_base = (volatile u8 *)S5P_PA_UART(CONFIG_S3C_LOWLEVEL_UART_PORT); } #endif /* __ASM_ARCH_UNCOMPRESS_H */ diff --git a/arch/arm/mach-s5pv210/include/mach/uncompress.h b/arch/arm/mach-s5pv210/include/mach/uncompress.h index ef977ea8546d..231cb07de058 100644 --- a/arch/arm/mach-s5pv210/include/mach/uncompress.h +++ b/arch/arm/mach-s5pv210/include/mach/uncompress.h @@ -21,6 +21,8 @@ static void arch_detect_cpu(void) /* we do not need to do any cpu detection here at the moment. */ fifo_mask = S5PV210_UFSTAT_TXMASK; fifo_max = 63 << S5PV210_UFSTAT_TXSHIFT; + + uart_base = (volatile u8 *)S5P_PA_UART(CONFIG_S3C_LOWLEVEL_UART_PORT); } #endif /* __ASM_ARCH_UNCOMPRESS_H */ diff --git a/arch/arm/plat-samsung/Kconfig b/arch/arm/plat-samsung/Kconfig index f8ed2de0a678..ec68155a8bf1 100644 --- a/arch/arm/plat-samsung/Kconfig +++ b/arch/arm/plat-samsung/Kconfig @@ -475,6 +475,12 @@ config SAMSUNG_WAKEMASK and above. This code allows a set of interrupt to wakeup-mask mappings. See <plat/wakeup-mask.h> +config SAMSUNG_WDT_RESET + bool + help + Compile support for system restart by triggering watchdog reset. + Used on SoCs that do not provide dedicated reset control. + config S5P_PM bool help diff --git a/arch/arm/plat-samsung/Makefile b/arch/arm/plat-samsung/Makefile index a23c460299a1..03cea140cfd0 100644 --- a/arch/arm/plat-samsung/Makefile +++ b/arch/arm/plat-samsung/Makefile @@ -56,6 +56,7 @@ obj-$(CONFIG_PM) += pm-gpio.o obj-$(CONFIG_SAMSUNG_PM_CHECK) += pm-check.o obj-$(CONFIG_SAMSUNG_WAKEMASK) += wakeup-mask.o +obj-$(CONFIG_SAMSUNG_WDT_RESET) += watchdog-reset.o obj-$(CONFIG_S5P_PM) += s5p-pm.o s5p-irq-pm.o obj-$(CONFIG_S5P_SLEEP) += s5p-sleep.o diff --git a/arch/arm/plat-samsung/include/plat/regs-watchdog.h b/arch/arm/plat-samsung/include/plat/regs-watchdog.h deleted file mode 100644 index 4938492470f7..000000000000 --- a/arch/arm/plat-samsung/include/plat/regs-watchdog.h +++ /dev/null @@ -1,41 +0,0 @@ -/* arch/arm/mach-s3c2410/include/mach/regs-watchdog.h - * - * Copyright (c) 2003 Simtec Electronics <linux@simtec.co.uk> - * http://www.simtec.co.uk/products/SWLINUX/ - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * S3C2410 Watchdog timer control -*/ - - -#ifndef __ASM_ARCH_REGS_WATCHDOG_H -#define __ASM_ARCH_REGS_WATCHDOG_H - -#define S3C_WDOGREG(x) ((x) + S3C_VA_WATCHDOG) - -#define S3C2410_WTCON S3C_WDOGREG(0x00) -#define S3C2410_WTDAT S3C_WDOGREG(0x04) -#define S3C2410_WTCNT S3C_WDOGREG(0x08) - -/* the watchdog can either generate a reset pulse, or an - * interrupt. - */ - -#define S3C2410_WTCON_RSTEN (0x01) -#define S3C2410_WTCON_INTEN (1<<2) -#define S3C2410_WTCON_ENABLE (1<<5) - -#define S3C2410_WTCON_DIV16 (0<<3) -#define S3C2410_WTCON_DIV32 (1<<3) -#define S3C2410_WTCON_DIV64 (2<<3) -#define S3C2410_WTCON_DIV128 (3<<3) - -#define S3C2410_WTCON_PRESCALE(x) ((x) << 8) -#define S3C2410_WTCON_PRESCALE_MASK (0xff00) - -#endif /* __ASM_ARCH_REGS_WATCHDOG_H */ - - diff --git a/arch/arm/plat-samsung/include/plat/uncompress.h b/arch/arm/plat-samsung/include/plat/uncompress.h index 02b66d723d1a..4afc32f90b6d 100644 --- a/arch/arm/plat-samsung/include/plat/uncompress.h +++ b/arch/arm/plat-samsung/include/plat/uncompress.h @@ -21,6 +21,8 @@ typedef unsigned int upf_t; /* cannot include linux/serial_core.h */ unsigned int fifo_mask; unsigned int fifo_max; +volatile u8 *uart_base; + /* forward declerations */ static void arch_detect_cpu(void); @@ -28,19 +30,24 @@ static void arch_detect_cpu(void); /* defines for UART registers */ #include <plat/regs-serial.h> -#include <plat/regs-watchdog.h> /* working in physical space... */ -#undef S3C2410_WDOGREG -#define S3C2410_WDOGREG(x) ((S3C24XX_PA_WATCHDOG + (x))) +#define S3C_WDOGREG(x) ((S3C_PA_WDT + (x))) + +#define S3C2410_WTCON S3C_WDOGREG(0x00) +#define S3C2410_WTDAT S3C_WDOGREG(0x04) +#define S3C2410_WTCNT S3C_WDOGREG(0x08) + +#define S3C2410_WTCON_RSTEN (1 << 0) +#define S3C2410_WTCON_ENABLE (1 << 5) + +#define S3C2410_WTCON_DIV128 (3 << 3) + +#define S3C2410_WTCON_PRESCALE(x) ((x) << 8) /* how many bytes we allow into the FIFO at a time in FIFO mode */ #define FIFO_MAX (14) -#ifdef S3C_PA_UART -#define uart_base S3C_PA_UART + (S3C_UART_OFFSET * CONFIG_S3C_LOWLEVEL_UART_PORT) -#endif - static __inline__ void uart_wr(unsigned int reg, unsigned int val) { diff --git a/arch/arm/plat-samsung/include/plat/watchdog-reset.h b/arch/arm/plat-samsung/include/plat/watchdog-reset.h index bc4db9b04e36..0386b8f76623 100644 --- a/arch/arm/plat-samsung/include/plat/watchdog-reset.h +++ b/arch/arm/plat-samsung/include/plat/watchdog-reset.h @@ -10,37 +10,11 @@ * published by the Free Software Foundation. */ -#include <plat/clock.h> -#include <plat/regs-watchdog.h> -#include <mach/map.h> +#ifndef __PLAT_SAMSUNG_WATCHDOG_RESET_H +#define __PLAT_SAMSUNG_WATCHDOG_RESET_H -#include <linux/clk.h> -#include <linux/err.h> -#include <linux/io.h> -#include <linux/delay.h> +extern void samsung_wdt_reset(void); +extern void samsung_wdt_reset_of_init(void); +extern void samsung_wdt_reset_init(void __iomem *base); -static inline void arch_wdt_reset(void) -{ - printk("arch_reset: attempting watchdog reset\n"); - - __raw_writel(0, S3C2410_WTCON); /* disable watchdog, to be safe */ - - if (!IS_ERR(s3c2410_wdtclk)) - clk_enable(s3c2410_wdtclk); - - /* put initial values into count and data */ - __raw_writel(0x80, S3C2410_WTCNT); - __raw_writel(0x80, S3C2410_WTDAT); - - /* set the watchdog to go and reset... */ - __raw_writel(S3C2410_WTCON_ENABLE|S3C2410_WTCON_DIV16|S3C2410_WTCON_RSTEN | - S3C2410_WTCON_PRESCALE(0x20), S3C2410_WTCON); - - /* wait for reset to assert... */ - mdelay(500); - - printk(KERN_ERR "Watchdog reset failed to assert reset\n"); - - /* delay to allow the serial port to show the message */ - mdelay(50); -} +#endif /* __PLAT_SAMSUNG_WATCHDOG_RESET_H */ diff --git a/arch/arm/plat-samsung/watchdog-reset.c b/arch/arm/plat-samsung/watchdog-reset.c new file mode 100644 index 000000000000..2ecb50bea044 --- /dev/null +++ b/arch/arm/plat-samsung/watchdog-reset.c @@ -0,0 +1,97 @@ +/* arch/arm/plat-samsung/watchdog-reset.c + * + * Copyright (c) 2008 Simtec Electronics + * Ben Dooks <ben@simtec.co.uk> + * + * Coyright (c) 2013 Tomasz Figa <tomasz.figa@gmail.com> + * + * Watchdog reset support for Samsung SoCs. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. +*/ + +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/delay.h> +#include <linux/of.h> +#include <linux/of_address.h> + +#define S3C2410_WTCON 0x00 +#define S3C2410_WTDAT 0x04 +#define S3C2410_WTCNT 0x08 + +#define S3C2410_WTCON_ENABLE (1 << 5) +#define S3C2410_WTCON_DIV16 (0 << 3) +#define S3C2410_WTCON_RSTEN (1 << 0) +#define S3C2410_WTCON_PRESCALE(x) ((x) << 8) + +static void __iomem *wdt_base; +static struct clk *wdt_clock; + +void samsung_wdt_reset(void) +{ + if (!wdt_base) { + pr_err("%s: wdt reset not initialized\n", __func__); + /* delay to allow the serial port to show the message */ + mdelay(50); + return; + } + + if (!IS_ERR(wdt_clock)) + clk_prepare_enable(wdt_clock); + + /* disable watchdog, to be safe */ + __raw_writel(0, wdt_base + S3C2410_WTCON); + + /* put initial values into count and data */ + __raw_writel(0x80, wdt_base + S3C2410_WTCNT); + __raw_writel(0x80, wdt_base + S3C2410_WTDAT); + + /* set the watchdog to go and reset... */ + __raw_writel(S3C2410_WTCON_ENABLE | S3C2410_WTCON_DIV16 | + S3C2410_WTCON_RSTEN | S3C2410_WTCON_PRESCALE(0x20), + wdt_base + S3C2410_WTCON); + + /* wait for reset to assert... */ + mdelay(500); + + pr_err("Watchdog reset failed to assert reset\n"); + + /* delay to allow the serial port to show the message */ + mdelay(50); +} + +#ifdef CONFIG_OF +static const struct of_device_id s3c2410_wdt_match[] = { + { .compatible = "samsung,s3c2410-wdt" }, + {}, +}; + +void __init samsung_wdt_reset_of_init(void) +{ + struct device_node *np; + + np = of_find_matching_node(NULL, s3c2410_wdt_match); + if (!np) { + pr_err("%s: failed to find watchdog node\n", __func__); + return; + } + + wdt_base = of_iomap(np, 0); + if (!wdt_base) { + pr_err("%s: failed to map watchdog registers\n", __func__); + return; + } + + wdt_clock = of_clk_get(np, 0); +} +#endif + +void __init samsung_wdt_reset_init(void __iomem *base) +{ + wdt_base = base; + wdt_clock = clk_get(NULL, "watchdog"); +} |