diff options
Diffstat (limited to 'arch/arm/plat-s3c/pm.c')
| -rw-r--r-- | arch/arm/plat-s3c/pm.c | 378 |
1 files changed, 0 insertions, 378 deletions
diff --git a/arch/arm/plat-s3c/pm.c b/arch/arm/plat-s3c/pm.c deleted file mode 100644 index 767470601e5..00000000000 --- a/arch/arm/plat-s3c/pm.c +++ /dev/null @@ -1,378 +0,0 @@ -/* linux/arch/arm/plat-s3c/pm.c - * - * Copyright 2008 Openmoko, Inc. - * Copyright 2004-2008 Simtec Electronics - * Ben Dooks <ben@simtec.co.uk> - * http://armlinux.simtec.co.uk/ - * - * S3C common power management (suspend to ram) support. - * - * 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/init.h> -#include <linux/suspend.h> -#include <linux/errno.h> -#include <linux/delay.h> -#include <linux/serial_core.h> -#include <linux/io.h> - -#include <asm/cacheflush.h> -#include <mach/hardware.h> -#include <mach/map.h> - -#include <plat/regs-serial.h> -#include <mach/regs-clock.h> -#include <mach/regs-irq.h> -#include <asm/irq.h> - -#include <plat/pm.h> -#include <plat/pm-core.h> - -/* for external use */ - -unsigned long s3c_pm_flags; - -/* Debug code: - * - * This code supports debug output to the low level UARTs for use on - * resume before the console layer is available. -*/ - -#ifdef CONFIG_S3C2410_PM_DEBUG -extern void printascii(const char *); - -void s3c_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 inline void s3c_pm_debug_init(void) -{ - /* restart uart clocks so we can use them to output */ - s3c_pm_debug_init_uart(); -} - -#else -#define s3c_pm_debug_init() do { } while(0) - -#endif /* CONFIG_S3C2410_PM_DEBUG */ - -/* Save the UART configurations if we are configured for debug. */ - -unsigned char pm_uart_udivslot; - -#ifdef CONFIG_S3C2410_PM_DEBUG - -struct pm_uart_save uart_save[CONFIG_SERIAL_SAMSUNG_UARTS]; - -static void s3c_pm_save_uart(unsigned int uart, struct pm_uart_save *save) -{ - void __iomem *regs = S3C_VA_UARTx(uart); - - save->ulcon = __raw_readl(regs + S3C2410_ULCON); - save->ucon = __raw_readl(regs + S3C2410_UCON); - save->ufcon = __raw_readl(regs + S3C2410_UFCON); - save->umcon = __raw_readl(regs + S3C2410_UMCON); - save->ubrdiv = __raw_readl(regs + S3C2410_UBRDIV); - - if (pm_uart_udivslot) - save->udivslot = __raw_readl(regs + S3C2443_DIVSLOT); - - S3C_PMDBG("UART[%d]: ULCON=%04x, UCON=%04x, UFCON=%04x, UBRDIV=%04x\n", - uart, save->ulcon, save->ucon, save->ufcon, save->ubrdiv); -} - -static void s3c_pm_save_uarts(void) -{ - struct pm_uart_save *save = uart_save; - unsigned int uart; - - for (uart = 0; uart < CONFIG_SERIAL_SAMSUNG_UARTS; uart++, save++) - s3c_pm_save_uart(uart, save); -} - -static void s3c_pm_restore_uart(unsigned int uart, struct pm_uart_save *save) -{ - void __iomem *regs = S3C_VA_UARTx(uart); - - s3c_pm_arch_update_uart(regs, save); - - __raw_writel(save->ulcon, regs + S3C2410_ULCON); - __raw_writel(save->ucon, regs + S3C2410_UCON); - __raw_writel(save->ufcon, regs + S3C2410_UFCON); - __raw_writel(save->umcon, regs + S3C2410_UMCON); - __raw_writel(save->ubrdiv, regs + S3C2410_UBRDIV); - - if (pm_uart_udivslot) - __raw_writel(save->udivslot, regs + S3C2443_DIVSLOT); -} - -static void s3c_pm_restore_uarts(void) -{ - struct pm_uart_save *save = uart_save; - unsigned int uart; - - for (uart = 0; uart < CONFIG_SERIAL_SAMSUNG_UARTS; uart++, save++) - s3c_pm_restore_uart(uart, save); -} -#else -static void s3c_pm_save_uarts(void) { } -static void s3c_pm_restore_uarts(void) { } -#endif - -/* The IRQ ext-int code goes here, it is too small to currently bother - * with its own file. */ - -unsigned long s3c_irqwake_intmask = 0xffffffffL; -unsigned long s3c_irqwake_eintmask = 0xffffffffL; - -int s3c_irqext_wake(unsigned int irqno, unsigned int state) -{ - unsigned long bit = 1L << IRQ_EINT_BIT(irqno); - - if (!(s3c_irqwake_eintallow & bit)) - return -ENOENT; - - printk(KERN_INFO "wake %s for irq %d\n", - state ? "enabled" : "disabled", irqno); - - if (!state) - s3c_irqwake_eintmask |= bit; - else - s3c_irqwake_eintmask &= ~bit; - - return 0; -} - -/* helper functions to save and restore register state */ - -/** - * s3c_pm_do_save() - save a set of registers for restoration on resume. - * @ptr: Pointer to an array of registers. - * @count: Size of the ptr array. - * - * Run through the list of registers given, saving their contents in the - * array for later restoration when we wakeup. - */ -void s3c_pm_do_save(struct sleep_save *ptr, int count) -{ - for (; count > 0; count--, ptr++) { - ptr->val = __raw_readl(ptr->reg); - S3C_PMDBG("saved %p value %08lx\n", ptr->reg, ptr->val); - } -} - -/** - * s3c_pm_do_restore() - restore register values from the save list. - * @ptr: Pointer to an array of registers. - * @count: Size of the ptr array. - * - * Restore the register values saved from s3c_pm_do_save(). - * - * Note, we do not use S3C_PMDBG() in here, as the system may not have - * restore the UARTs state yet -*/ - -void s3c_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); - } -} - -/** - * s3c_pm_do_restore_core() - early restore register values from save list. - * - * This is similar to s3c_pm_do_restore() except we try and minimise the - * side effects of the function in case registers that hardware might need - * to work has been restored. - * - * WARNING: Do not put any debug in here that may effect memory or use - * peripherals, as things may be changing! -*/ - -void s3c_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 s3c_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)) { - S3C_PMDBG("IRQ %d asserted at resume\n", start+i); - } - } -} - - -void (*pm_cpu_prep)(void); -void (*pm_cpu_sleep)(void); - -#define any_allowed(mask, allow) (((mask) & (allow)) != (allow)) - -/* s3c_pm_enter - * - * central control for sleep/resume process -*/ - -static int s3c_pm_enter(suspend_state_t state) -{ - static unsigned long regs_save[16]; - - /* ensure the debug is initialised (if enabled) */ - - s3c_pm_debug_init(); - - S3C_PMDBG("%s(%d)\n", __func__, state); - - if (pm_cpu_prep == NULL || pm_cpu_sleep == NULL) { - printk(KERN_ERR "%s: error: no cpu sleep function\n", __func__); - 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 "%s: No wake-up sources!\n", __func__); - printk(KERN_ERR "%s: Aborting sleep\n", __func__); - return -EINVAL; - } - - /* store the physical address of the register recovery block */ - - s3c_sleep_save_phys = virt_to_phys(regs_save); - - S3C_PMDBG("s3c_sleep_save_phys=0x%08lx\n", s3c_sleep_save_phys); - - /* save all necessary core registers not covered by the drivers */ - - s3c_pm_save_gpios(); - s3c_pm_save_uarts(); - s3c_pm_save_core(); - - /* set the irq configuration for wake */ - - s3c_pm_configure_extint(); - - S3C_PMDBG("sleep: irq wakeup masks: %08lx,%08lx\n", - s3c_irqwake_intmask, s3c_irqwake_eintmask); - - s3c_pm_arch_prepare_irqs(); - - /* call cpu specific preparation */ - - pm_cpu_prep(); - - /* flush cache back to ram */ - - flush_cache_all(); - - s3c_pm_check_store(); - - /* send the cpu to sleep... */ - - s3c_pm_arch_stop_clocks(); - - /* s3c_cpu_save will also act as our return point from when - * we resume as it saves its own register state and restores it - * during the resume. */ - - s3c_cpu_save(regs_save); - - /* restore the cpu state using the kernel's cpu init code. */ - - cpu_init(); - - /* restore the system state */ - - s3c_pm_restore_core(); - s3c_pm_restore_uarts(); - s3c_pm_restore_gpios(); - - s3c_pm_debug_init(); - - /* check what irq (if any) restored the system */ - - s3c_pm_arch_show_resume_irqs(); - - S3C_PMDBG("%s: post sleep, preparing to return\n", __func__); - - /* LEDs should now be 1110 */ - s3c_pm_debug_smdkled(1 << 1, 0); - - s3c_pm_check_restore(); - - /* ok, let's return from sleep */ - - S3C_PMDBG("S3C PM Resume (post-restore)\n"); - return 0; -} - -/* callback from assembly code */ -void s3c_pm_cb_flushcache(void) -{ - flush_cache_all(); -} - -static int s3c_pm_prepare(void) -{ - /* prepare check area if configured */ - - s3c_pm_check_prepare(); - return 0; -} - -static void s3c_pm_finish(void) -{ - s3c_pm_check_cleanup(); -} - -static struct platform_suspend_ops s3c_pm_ops = { - .enter = s3c_pm_enter, - .prepare = s3c_pm_prepare, - .finish = s3c_pm_finish, - .valid = suspend_valid_only_mem, -}; - -/* s3c_pm_init - * - * Attach the power management functions. This should be called - * from the board specific initialisation if the board supports - * it. -*/ - -int __init s3c_pm_init(void) -{ - printk("S3C Power Management, Copyright 2004 Simtec Electronics\n"); - - suspend_set_ops(&s3c_pm_ops); - return 0; -} |