diff options
| -rw-r--r-- | arch/arm/plat-s3c24xx/cpu.c | 27 | ||||
| -rw-r--r-- | include/asm-arm/arch-s3c2410/system-reset.h | 64 | ||||
| -rw-r--r-- | include/asm-arm/arch-s3c2410/system.h | 46 |
3 files changed, 92 insertions, 45 deletions
diff --git a/arch/arm/plat-s3c24xx/cpu.c b/arch/arm/plat-s3c24xx/cpu.c index f513ab083b8f..f5699cadb0c3 100644 --- a/arch/arm/plat-s3c24xx/cpu.c +++ b/arch/arm/plat-s3c24xx/cpu.c @@ -28,15 +28,19 @@ #include <linux/ioport.h> #include <linux/serial_core.h> #include <linux/platform_device.h> +#include <linux/delay.h> #include <asm/hardware.h> #include <asm/irq.h> #include <asm/io.h> #include <asm/delay.h> +#include <asm/cacheflush.h> #include <asm/mach/arch.h> #include <asm/mach/map.h> +#include <asm/arch/system-reset.h> + #include <asm/arch/regs-gpio.h> #include <asm/plat-s3c/regs-serial.h> @@ -203,6 +207,27 @@ static unsigned long s3c24xx_read_idcode_v4(void) #endif } +/* Hook for arm_pm_restart to ensure we execute the reset code + * with the caches enabled. It seems at least the S3C2440 has a problem + * resetting if there is bus activity interrupted by the reset. + */ +static void s3c24xx_pm_restart(char mode) +{ + if (mode != 's') { + unsigned long flags; + + local_irq_save(flags); + __cpuc_flush_kern_all(); + __cpuc_flush_user_all(); + + arch_reset(mode); + local_irq_restore(flags); + } + + /* fallback, or unhandled */ + arm_machine_restart(mode); +} + void __init s3c24xx_init_io(struct map_desc *mach_desc, int size) { unsigned long idcode = 0x0; @@ -230,6 +255,8 @@ void __init s3c24xx_init_io(struct map_desc *mach_desc, int size) panic("Unsupported S3C24XX CPU"); } + arm_pm_restart = s3c24xx_pm_restart; + (cpu->map_io)(mach_desc, size); } diff --git a/include/asm-arm/arch-s3c2410/system-reset.h b/include/asm-arm/arch-s3c2410/system-reset.h new file mode 100644 index 000000000000..1615bce0c026 --- /dev/null +++ b/include/asm-arm/arch-s3c2410/system-reset.h @@ -0,0 +1,64 @@ +/* linux/include/asm-arm/arch-s3c2410/system-reset.h + * + * Copyright (c) 2008 Simtec Electronics + * Ben Dooks <ben@simtec.co.uk> + * + * S3C2410 - System define for arch_reset() function + * + * 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 <asm/hardware.h> +#include <asm/io.h> + +#include <asm/plat-s3c/regs-watchdog.h> +#include <asm/arch/regs-clock.h> + +#include <linux/clk.h> +#include <linux/err.h> + +extern void (*s3c24xx_reset_hook)(void); + +static void +arch_reset(char mode) +{ + struct clk *wdtclk; + + if (mode == 's') { + cpu_reset(0); + } + + if (s3c24xx_reset_hook) + s3c24xx_reset_hook(); + + printk("arch_reset: attempting watchdog reset\n"); + + __raw_writel(0, S3C2410_WTCON); /* disable watchdog, to be safe */ + + wdtclk = clk_get(NULL, "watchdog"); + if (!IS_ERR(wdtclk)) { + clk_enable(wdtclk); + } else + printk(KERN_WARNING "%s: warning: cannot get watchdog clock\n", __func__); + + /* 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); + + /* we'll take a jump through zero as a poor second */ + cpu_reset(0); +} diff --git a/include/asm-arm/arch-s3c2410/system.h b/include/asm-arm/arch-s3c2410/system.h index 14de4e596f87..ad258085e53b 100644 --- a/include/asm-arm/arch-s3c2410/system.h +++ b/include/asm-arm/arch-s3c2410/system.h @@ -17,12 +17,8 @@ #include <asm/arch/idle.h> #include <asm/arch/reset.h> -#include <asm/plat-s3c/regs-watchdog.h> #include <asm/arch/regs-clock.h> -#include <linux/clk.h> -#include <linux/err.h> - void (*s3c24xx_idle)(void); void (*s3c24xx_reset_hook)(void); @@ -59,44 +55,4 @@ static void arch_idle(void) s3c24xx_default_idle(); } -static void -arch_reset(char mode) -{ - struct clk *wdtclk; - - if (mode == 's') { - cpu_reset(0); - } - - if (s3c24xx_reset_hook) - s3c24xx_reset_hook(); - - printk("arch_reset: attempting watchdog reset\n"); - - __raw_writel(0, S3C2410_WTCON); /* disable watchdog, to be safe */ - - wdtclk = clk_get(NULL, "watchdog"); - if (!IS_ERR(wdtclk)) { - clk_enable(wdtclk); - } else - printk(KERN_WARNING "%s: warning: cannot get watchdog clock\n", __func__); - - /* 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); - - /* we'll take a jump through zero as a poor second */ - cpu_reset(0); -} +#include <asm/arch/system-reset.h> |