diff options
Diffstat (limited to 'arch/arm/plat-s3c24xx/pm.c')
| -rw-r--r-- | arch/arm/plat-s3c24xx/pm.c | 503 |
1 files changed, 24 insertions, 479 deletions
diff --git a/arch/arm/plat-s3c24xx/pm.c b/arch/arm/plat-s3c24xx/pm.c index 34ef18e5b2a..062a29339a9 100644 --- a/arch/arm/plat-s3c24xx/pm.c +++ b/arch/arm/plat-s3c24xx/pm.c @@ -31,14 +31,9 @@ #include <linux/errno.h> #include <linux/time.h> #include <linux/interrupt.h> -#include <linux/crc32.h> -#include <linux/ioport.h> #include <linux/serial_core.h> #include <linux/io.h> -#include <asm/cacheflush.h> -#include <mach/hardware.h> - #include <plat/regs-serial.h> #include <mach/regs-clock.h> #include <mach/regs-gpio.h> @@ -49,10 +44,6 @@ #include <plat/pm.h> -/* for external use */ - -unsigned long s3c_pm_flags; - #define PFX "s3c24xx-pm: " static struct sleep_save core_save[] = { @@ -120,328 +111,14 @@ static struct sleep_save misc_save[] = { SAVE_ITEM(S3C2410_DCLKCON), }; -#ifdef CONFIG_S3C2410_PM_DEBUG - -#define SAVE_UART(va) \ - SAVE_ITEM((va) + S3C2410_ULCON), \ - SAVE_ITEM((va) + S3C2410_UCON), \ - SAVE_ITEM((va) + S3C2410_UFCON), \ - SAVE_ITEM((va) + S3C2410_UMCON), \ - SAVE_ITEM((va) + S3C2410_UBRDIV) - -static struct sleep_save uart_save[] = { - SAVE_UART(S3C24XX_VA_UART0), - SAVE_UART(S3C24XX_VA_UART1), -#ifndef CONFIG_CPU_S3C2400 - SAVE_UART(S3C24XX_VA_UART2), -#endif -}; - -/* debug - * - * we send the debug to printascii() to allow it to be seen if the - * system never wakes up from the sleep -*/ - -extern void printascii(const char *); - -void pm_dbg(const char *fmt, ...) -{ - va_list va; - char buff[256]; - - va_start(va, fmt); - vsprintf(buff, fmt, va); - va_end(va); - - printascii(buff); -} - -static void s3c2410_pm_debug_init(void) -{ - unsigned long tmp = __raw_readl(S3C2410_CLKCON); - - /* re-start uart clocks */ - tmp |= S3C2410_CLKCON_UART0; - tmp |= S3C2410_CLKCON_UART1; - tmp |= S3C2410_CLKCON_UART2; - - __raw_writel(tmp, S3C2410_CLKCON); - udelay(10); -} - -#define DBG(fmt...) pm_dbg(fmt) -#else -#define DBG(fmt...) printk(KERN_DEBUG fmt) - -#define s3c2410_pm_debug_init() do { } while(0) - -static struct sleep_save uart_save[] = {}; -#endif - -#if defined(CONFIG_S3C2410_PM_CHECK) && CONFIG_S3C2410_PM_CHECK_CHUNKSIZE != 0 - -/* suspend checking code... - * - * this next area does a set of crc checks over all the installed - * memory, so the system can verify if the resume was ok. - * - * CONFIG_S3C2410_PM_CHECK_CHUNKSIZE defines the block-size for the CRC, - * increasing it will mean that the area corrupted will be less easy to spot, - * and reducing the size will cause the CRC save area to grow -*/ - -#define CHECK_CHUNKSIZE (CONFIG_S3C2410_PM_CHECK_CHUNKSIZE * 1024) - -static u32 crc_size; /* size needed for the crc block */ -static u32 *crcs; /* allocated over suspend/resume */ - -typedef u32 *(run_fn_t)(struct resource *ptr, u32 *arg); - -/* s3c2410_pm_run_res - * - * go thorugh the given resource list, and look for system ram -*/ - -static void s3c2410_pm_run_res(struct resource *ptr, run_fn_t fn, u32 *arg) -{ - while (ptr != NULL) { - if (ptr->child != NULL) - s3c2410_pm_run_res(ptr->child, fn, arg); - - if ((ptr->flags & IORESOURCE_MEM) && - strcmp(ptr->name, "System RAM") == 0) { - DBG("Found system RAM at %08lx..%08lx\n", - ptr->start, ptr->end); - arg = (fn)(ptr, arg); - } - - ptr = ptr->sibling; - } -} - -static void s3c2410_pm_run_sysram(run_fn_t fn, u32 *arg) -{ - s3c2410_pm_run_res(&iomem_resource, fn, arg); -} - -static u32 *s3c2410_pm_countram(struct resource *res, u32 *val) -{ - u32 size = (u32)(res->end - res->start)+1; - - size += CHECK_CHUNKSIZE-1; - size /= CHECK_CHUNKSIZE; - - DBG("Area %08lx..%08lx, %d blocks\n", res->start, res->end, size); - - *val += size * sizeof(u32); - return val; -} - -/* s3c2410_pm_prepare_check - * - * prepare the necessary information for creating the CRCs. This - * must be done before the final save, as it will require memory - * allocating, and thus touching bits of the kernel we do not - * know about. -*/ - -static void s3c2410_pm_check_prepare(void) -{ - crc_size = 0; - - s3c2410_pm_run_sysram(s3c2410_pm_countram, &crc_size); - - DBG("s3c2410_pm_prepare_check: %u checks needed\n", crc_size); - - crcs = kmalloc(crc_size+4, GFP_KERNEL); - if (crcs == NULL) - printk(KERN_ERR "Cannot allocated CRC save area\n"); -} - -static u32 *s3c2410_pm_makecheck(struct resource *res, u32 *val) -{ - unsigned long addr, left; - - for (addr = res->start; addr < res->end; - addr += CHECK_CHUNKSIZE) { - left = res->end - addr; - - if (left > CHECK_CHUNKSIZE) - left = CHECK_CHUNKSIZE; - - *val = crc32_le(~0, phys_to_virt(addr), left); - val++; - } - - return val; -} - -/* s3c2410_pm_check_store - * - * compute the CRC values for the memory blocks before the final - * sleep. -*/ - -static void s3c2410_pm_check_store(void) -{ - if (crcs != NULL) - s3c2410_pm_run_sysram(s3c2410_pm_makecheck, crcs); -} - -/* in_region - * - * return TRUE if the area defined by ptr..ptr+size contatins the - * what..what+whatsz -*/ - -static inline int in_region(void *ptr, int size, void *what, size_t whatsz) -{ - if ((what+whatsz) < ptr) - return 0; - - if (what > (ptr+size)) - return 0; - - return 1; -} - -static u32 *s3c2410_pm_runcheck(struct resource *res, u32 *val) -{ - void *save_at = phys_to_virt(s3c2410_sleep_save_phys); - unsigned long addr; - unsigned long left; - void *ptr; - u32 calc; - - for (addr = res->start; addr < res->end; - addr += CHECK_CHUNKSIZE) { - left = res->end - addr; - - if (left > CHECK_CHUNKSIZE) - left = CHECK_CHUNKSIZE; - - ptr = phys_to_virt(addr); - - if (in_region(ptr, left, crcs, crc_size)) { - DBG("skipping %08lx, has crc block in\n", addr); - goto skip_check; - } - - if (in_region(ptr, left, save_at, 32*4 )) { - DBG("skipping %08lx, has save block in\n", addr); - goto skip_check; - } - - /* calculate and check the checksum */ - - calc = crc32_le(~0, ptr, left); - if (calc != *val) { - printk(KERN_ERR PFX "Restore CRC error at " - "%08lx (%08x vs %08x)\n", addr, calc, *val); - - DBG("Restore CRC error at %08lx (%08x vs %08x)\n", - addr, calc, *val); - } - - skip_check: - val++; - } - - return val; -} - -/* s3c2410_pm_check_restore - * - * check the CRCs after the restore event and free the memory used - * to hold them -*/ - -static void s3c2410_pm_check_restore(void) -{ - if (crcs != NULL) { - s3c2410_pm_run_sysram(s3c2410_pm_runcheck, crcs); - kfree(crcs); - crcs = NULL; - } -} - -#else - -#define s3c2410_pm_check_prepare() do { } while(0) -#define s3c2410_pm_check_restore() do { } while(0) -#define s3c2410_pm_check_store() do { } while(0) -#endif - -/* helper functions to save and restore register state */ - -void s3c2410_pm_do_save(struct sleep_save *ptr, int count) -{ - for (; count > 0; count--, ptr++) { - ptr->val = __raw_readl(ptr->reg); - DBG("saved %p value %08lx\n", ptr->reg, ptr->val); - } -} - -/* s3c2410_pm_do_restore - * - * restore the system from the given list of saved registers - * - * Note, we do not use DBG() in here, as the system may not have - * restore the UARTs state yet -*/ - -void s3c2410_pm_do_restore(struct sleep_save *ptr, int count) -{ - for (; count > 0; count--, ptr++) { - printk(KERN_DEBUG "restore %p (restore %08lx, was %08x)\n", - ptr->reg, ptr->val, __raw_readl(ptr->reg)); - - __raw_writel(ptr->val, ptr->reg); - } -} - -/* s3c2410_pm_do_restore_core - * - * similar to s3c2410_pm_do_restore_core - * - * WARNING: Do not put any debug in here that may effect memory or use - * peripherals, as things may be changing! -*/ - -static void s3c2410_pm_do_restore_core(struct sleep_save *ptr, int count) -{ - for (; count > 0; count--, ptr++) { - __raw_writel(ptr->val, ptr->reg); - } -} -/* s3c2410_pm_show_resume_irqs - * - * print any IRQs asserted at resume time (ie, we woke from) -*/ - -static void s3c2410_pm_show_resume_irqs(int start, unsigned long which, - unsigned long mask) -{ - int i; - - which &= ~mask; - - for (i = 0; i <= 31; i++) { - if ((which) & (1L<<i)) { - DBG("IRQ %d asserted at resume\n", start+i); - } - } -} - -/* s3c2410_pm_check_resume_pin +/* s3c_pm_check_resume_pin * * check to see if the pin is configured correctly for sleep mode, and * make any necessary adjustments if it is not */ -static void s3c2410_pm_check_resume_pin(unsigned int pin, unsigned int irqoffs) +static void s3c_pm_check_resume_pin(unsigned int pin, unsigned int irqoffs) { unsigned long irqstate; unsigned long pinstate; @@ -456,21 +133,21 @@ static void s3c2410_pm_check_resume_pin(unsigned int pin, unsigned int irqoffs) if (!irqstate) { if (pinstate == S3C2410_GPIO_IRQ) - DBG("Leaving IRQ %d (pin %d) enabled\n", irq, pin); + S3C_PMDBG("Leaving IRQ %d (pin %d) enabled\n", irq, pin); } else { if (pinstate == S3C2410_GPIO_IRQ) { - DBG("Disabling IRQ %d (pin %d)\n", irq, pin); + S3C_PMDBG("Disabling IRQ %d (pin %d)\n", irq, pin); s3c2410_gpio_cfgpin(pin, S3C2410_GPIO_INPUT); } } } -/* s3c2410_pm_configure_extint +/* s3c_pm_configure_extint * * configure all external interrupt pins */ -static void s3c2410_pm_configure_extint(void) +void s3c_pm_configure_extint(void) { int pin; @@ -480,11 +157,11 @@ static void s3c2410_pm_configure_extint(void) */ for (pin = S3C2410_GPF0; pin <= S3C2410_GPF7; pin++) { - s3c2410_pm_check_resume_pin(pin, pin - S3C2410_GPF0); + s3c_pm_check_resume_pin(pin, pin - S3C2410_GPF0); } for (pin = S3C2410_GPG0; pin <= S3C2410_GPG7; pin++) { - s3c2410_pm_check_resume_pin(pin, (pin - S3C2410_GPG0)+8); + s3c_pm_check_resume_pin(pin, (pin - S3C2410_GPG0)+8); } } @@ -494,12 +171,12 @@ static void s3c2410_pm_configure_extint(void) #define OFFS_DAT (S3C2410_GPADAT - S3C2410_GPACON) #define OFFS_UP (S3C2410_GPBUP - S3C2410_GPBCON) -/* s3c2410_pm_save_gpios() +/* s3c_pm_save_gpios() * * Save the state of the GPIOs */ -static void s3c2410_pm_save_gpios(void) +void s3c_pm_save_gpios(void) { struct gpio_sleep *gps = gpio_save; unsigned int gpio; @@ -538,7 +215,10 @@ static inline int is_out(unsigned long con) return con == 1; } -/* s3c2410_pm_restore_gpio() +/** + * s3c2410_pm_restore_gpio() - restore the given GPIO bank + * @index: The number of the GPIO bank being resumed. + * @gps: The sleep confgiuration for the bank. * * Restore one of the GPIO banks that was saved during suspend. This is * not as simple as once thought, due to the possibility of glitches @@ -646,8 +326,8 @@ static void s3c2410_pm_restore_gpio(int index, struct gpio_sleep *gps) __raw_writel(gps->gpup, base + OFFS_UP); } - DBG("GPIO[%d] CON %08lx => %08lx, DAT %08lx => %08lx\n", - index, old_gpcon, gps_gpcon, old_gpdat, gps_gpdat); + S3C_PMDBG("GPIO[%d] CON %08lx => %08lx, DAT %08lx => %08lx\n", + index, old_gpcon, gps_gpcon, old_gpdat, gps_gpdat); } @@ -656,7 +336,7 @@ static void s3c2410_pm_restore_gpio(int index, struct gpio_sleep *gps) * Restore the state of the GPIOs */ -static void s3c2410_pm_restore_gpios(void) +void s3c_pm_restore_gpios(void) { struct gpio_sleep *gps = gpio_save; int gpio; @@ -666,150 +346,15 @@ static void s3c2410_pm_restore_gpios(void) } } -void (*pm_cpu_prep)(void); -void (*pm_cpu_sleep)(void); - -#define any_allowed(mask, allow) (((mask) & (allow)) != (allow)) - -/* s3c2410_pm_enter - * - * central control for sleep/resume process -*/ - -static int s3c2410_pm_enter(suspend_state_t state) +void s3c_pm_restore_core(void) { - unsigned long regs_save[16]; - - /* ensure the debug is initialised (if enabled) */ - - s3c2410_pm_debug_init(); - - 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; - } - - /* check if we have anything to wake-up with... bad things seem - * to happen if you suspend with no wakeup (system will often - * require a full power-cycle) - */ - - if (!any_allowed(s3c_irqwake_intmask, s3c_irqwake_intallow) && - !any_allowed(s3c_irqwake_eintmask, s3c_irqwake_eintallow)) { - printk(KERN_ERR PFX "No sources enabled for wake-up!\n"); - printk(KERN_ERR PFX "Aborting sleep\n"); - return -EINVAL; - } - - /* prepare check area if configured */ - - s3c2410_pm_check_prepare(); - - /* store the physical address of the register recovery block */ - - s3c2410_sleep_save_phys = virt_to_phys(regs_save); - - DBG("s3c2410_sleep_save_phys=0x%08lx\n", s3c2410_sleep_save_phys); - - /* save all necessary core registers not covered by the drivers */ - - s3c2410_pm_save_gpios(); - s3c2410_pm_do_save(misc_save, ARRAY_SIZE(misc_save)); - s3c2410_pm_do_save(core_save, ARRAY_SIZE(core_save)); - s3c2410_pm_do_save(uart_save, ARRAY_SIZE(uart_save)); - - /* set the irq configuration for wake */ - - s3c2410_pm_configure_extint(); - - DBG("sleep: irq wakeup masks: %08lx,%08lx\n", - s3c_irqwake_intmask, s3c_irqwake_eintmask); - - __raw_writel(s3c_irqwake_intmask, S3C2410_INTMSK); - __raw_writel(s3c_irqwake_eintmask, S3C2410_EINTMASK); - - /* 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 preparation */ - - pm_cpu_prep(); - - /* flush cache back to ram */ - - flush_cache_all(); - - s3c2410_pm_check_store(); - - /* send the cpu to sleep... */ - - __raw_writel(0x00, S3C2410_CLKCON); /* turn off clocks over sleep */ - - /* 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(); - - /* restore the system state */ - - s3c2410_pm_do_restore_core(core_save, ARRAY_SIZE(core_save)); - s3c2410_pm_do_restore(misc_save, ARRAY_SIZE(misc_save)); - s3c2410_pm_do_restore(uart_save, ARRAY_SIZE(uart_save)); - s3c2410_pm_restore_gpios(); - - s3c2410_pm_debug_init(); - - /* check what irq (if any) restored the system */ - - DBG("post sleep: IRQs 0x%08x, 0x%08x\n", - __raw_readl(S3C2410_SRCPND), - __raw_readl(S3C2410_EINTPEND)); - - s3c2410_pm_show_resume_irqs(IRQ_EINT0, __raw_readl(S3C2410_SRCPND), - s3c_irqwake_intmask); - - s3c2410_pm_show_resume_irqs(IRQ_EINT4-4, __raw_readl(S3C2410_EINTPEND), - s3c_irqwake_eintmask); - - DBG("post sleep, preparing to return\n"); - - s3c2410_pm_check_restore(); - - /* ok, let's return from sleep */ - - DBG("S3C2410 PM Resume (post-restore)\n"); - return 0; + s3c_pm_do_restore_core(core_save, ARRAY_SIZE(core_save)); + s3c_pm_do_restore(misc_save, ARRAY_SIZE(misc_save)); } -static struct platform_suspend_ops s3c2410_pm_ops = { - .enter = s3c2410_pm_enter, - .valid = suspend_valid_only_mem, -}; - -/* s3c2410_pm_init - * - * Attach the power management functions. This should be called - * from the board specific initialisation if the board supports - * it. -*/ - -int __init s3c2410_pm_init(void) +void s3c_pm_save_core(void) { - printk("S3C2410 Power Management, (c) 2004 Simtec Electronics\n"); - - suspend_set_ops(&s3c2410_pm_ops); - return 0; + s3c_pm_do_save(misc_save, ARRAY_SIZE(misc_save)); + s3c_pm_do_save(core_save, ARRAY_SIZE(core_save)); } + |