diff options
Diffstat (limited to 'arch/arm/mach-s3c2410/pm.c')
| -rw-r--r-- | arch/arm/mach-s3c2410/pm.c | 72 |
1 files changed, 27 insertions, 45 deletions
diff --git a/arch/arm/mach-s3c2410/pm.c b/arch/arm/mach-s3c2410/pm.c index a589fe76d915..b49a0b3b72b3 100644 --- a/arch/arm/mach-s3c2410/pm.c +++ b/arch/arm/mach-s3c2410/pm.c @@ -1,9 +1,9 @@ /* linux/arch/arm/mach-s3c2410/pm.c * - * Copyright (c) 2004 Simtec Electronics + * Copyright (c) 2004,2006 Simtec Electronics * Ben Dooks <ben@simtec.co.uk> * - * S3C2410 Power Manager (Suspend-To-RAM) support + * S3C24XX Power Manager (Suspend-To-RAM) support * * See Documentation/arm/Samsung-S3C24XX/Suspend.txt for more information * @@ -24,9 +24,6 @@ * Parts based on arch/arm/mach-pxa/pm.c * * Thanks to Dimitry Andric for debugging - * - * Modifications: - * 10-Mar-2005 LCVR Changed S3C2410_VA_UART to S3C24XX_VA_UART */ #include <linux/init.h> @@ -38,6 +35,7 @@ #include <linux/ioport.h> #include <linux/delay.h> +#include <asm/cacheflush.h> #include <asm/hardware.h> #include <asm/io.h> @@ -55,14 +53,6 @@ unsigned long s3c_pm_flags; -/* cache functions from arch/arm/mm/proc-arm920.S */ - -#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH -extern void arm920_flush_kern_cache_all(void); -#else -static void arm920_flush_kern_cache_all(void) { } -#endif - #define PFX "s3c24xx-pm: " static struct sleep_save core_save[] = { @@ -92,19 +82,6 @@ static struct sleep_save core_save[] = { SAVE_ITEM(S3C2410_REFRESH), }; -/* this lot should be really saved by the IRQ code */ -static struct sleep_save irq_save[] = { - SAVE_ITEM(S3C2410_EXTINT0), - SAVE_ITEM(S3C2410_EXTINT1), - SAVE_ITEM(S3C2410_EXTINT2), - SAVE_ITEM(S3C2410_EINFLT0), - SAVE_ITEM(S3C2410_EINFLT1), - SAVE_ITEM(S3C2410_EINFLT2), - SAVE_ITEM(S3C2410_EINFLT3), - SAVE_ITEM(S3C2410_EINTMASK), - SAVE_ITEM(S3C2410_INTMSK) -}; - static struct sleep_save gpio_save[] = { SAVE_ITEM(S3C2410_GPACON), SAVE_ITEM(S3C2410_GPADAT), @@ -165,7 +142,7 @@ static struct sleep_save uart_save[] = { extern void printascii(const char *); -static void pm_dbg(const char *fmt, ...) +void pm_dbg(const char *fmt, ...) { va_list va; char buff[256]; @@ -509,6 +486,9 @@ static void s3c2410_pm_configure_extint(void) } } +void (*pm_cpu_prep)(void); +void (*pm_cpu_sleep)(void); + #define any_allowed(mask, allow) (((mask) & (allow)) != (allow)) /* s3c2410_pm_enter @@ -519,7 +499,6 @@ static void s3c2410_pm_configure_extint(void) static int s3c2410_pm_enter(suspend_state_t state) { unsigned long regs_save[16]; - unsigned long tmp; /* ensure the debug is initialised (if enabled) */ @@ -527,6 +506,11 @@ static int s3c2410_pm_enter(suspend_state_t state) DBG("s3c2410_pm_enter(%d)\n", state); + if (pm_cpu_prep == NULL || pm_cpu_sleep == NULL) { + printk(KERN_ERR PFX "error: no cpu sleep functions set\n"); + return -EINVAL; + } + if (state != PM_SUSPEND_MEM) { printk(KERN_ERR PFX "error: only PM_SUSPEND_MEM supported\n"); return -EINVAL; @@ -554,17 +538,9 @@ static int s3c2410_pm_enter(suspend_state_t state) DBG("s3c2410_sleep_save_phys=0x%08lx\n", s3c2410_sleep_save_phys); - /* ensure at least GESTATUS3 has the resume address */ - - __raw_writel(virt_to_phys(s3c2410_cpu_resume), S3C2410_GSTATUS3); - - DBG("GSTATUS3 0x%08x\n", __raw_readl(S3C2410_GSTATUS3)); - DBG("GSTATUS4 0x%08x\n", __raw_readl(S3C2410_GSTATUS4)); - /* save all necessary core registers not covered by the drivers */ s3c2410_pm_do_save(gpio_save, ARRAY_SIZE(gpio_save)); - s3c2410_pm_do_save(irq_save, ARRAY_SIZE(irq_save)); s3c2410_pm_do_save(core_save, ARRAY_SIZE(core_save)); s3c2410_pm_do_save(uart_save, ARRAY_SIZE(uart_save)); @@ -581,10 +557,16 @@ static int s3c2410_pm_enter(suspend_state_t state) /* ack any outstanding external interrupts before we go to sleep */ __raw_writel(__raw_readl(S3C2410_EINTPEND), S3C2410_EINTPEND); + __raw_writel(__raw_readl(S3C2410_INTPND), S3C2410_INTPND); + __raw_writel(__raw_readl(S3C2410_SRCPND), S3C2410_SRCPND); + + /* call cpu specific preperation */ + + pm_cpu_prep(); /* flush cache back to ram */ - arm920_flush_kern_cache_all(); + flush_cache_all(); s3c2410_pm_check_store(); @@ -592,23 +574,23 @@ static int s3c2410_pm_enter(suspend_state_t state) __raw_writel(0x00, S3C2410_CLKCON); /* turn off clocks over sleep */ - s3c2410_cpu_suspend(regs_save); + /* s3c2410_cpu_save will also act as our return point from when + * we resume as it saves its own register state, so use the return + * code to differentiate return from save and return from sleep */ + + if (s3c2410_cpu_save(regs_save) == 0) { + flush_cache_all(); + pm_cpu_sleep(); + } /* restore the cpu state */ cpu_init(); - /* unset the return-from-sleep flag, to ensure reset */ - - tmp = __raw_readl(S3C2410_GSTATUS2); - tmp &= S3C2410_GSTATUS2_OFFRESET; - __raw_writel(tmp, S3C2410_GSTATUS2); - /* restore the system state */ s3c2410_pm_do_restore_core(core_save, ARRAY_SIZE(core_save)); s3c2410_pm_do_restore(gpio_save, ARRAY_SIZE(gpio_save)); - s3c2410_pm_do_restore(irq_save, ARRAY_SIZE(irq_save)); s3c2410_pm_do_restore(uart_save, ARRAY_SIZE(uart_save)); s3c2410_pm_debug_init(); |