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pm.c

/* linux/arch/arm/plat-s3c64xx/pm.c
 *
 * Copyright 2008 Openmoko, Inc.
 * Copyright 2008 Simtec Electronics
 *    Ben Dooks <ben@simtec.co.uk>
 *    http://armlinux.simtec.co.uk/
 *
 * S3C64XX CPU PM 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/serial_core.h>
#include <linux/io.h>

#include <mach/map.h>
#include <mach/irqs.h>

#include <plat/pm.h>
#include <plat/wakeup-mask.h>

#include <mach/regs-sys.h>
#include <mach/regs-gpio.h>
#include <mach/regs-clock.h>
#include <mach/regs-syscon-power.h>
#include <mach/regs-gpio-memport.h>

#ifdef CONFIG_S3C_PM_DEBUG_LED_SMDK
#include <mach/gpio-bank-n.h>

void s3c_pm_debug_smdkled(u32 set, u32 clear)
{
      unsigned long flags;
      u32 reg;

      local_irq_save(flags);
      reg = __raw_readl(S3C64XX_GPNCON);
      reg &= ~(S3C64XX_GPN_CONMASK(12) | S3C64XX_GPN_CONMASK(13) |
             S3C64XX_GPN_CONMASK(14) | S3C64XX_GPN_CONMASK(15));
      reg |= S3C64XX_GPN_OUTPUT(12) | S3C64XX_GPN_OUTPUT(13) |
             S3C64XX_GPN_OUTPUT(14) | S3C64XX_GPN_OUTPUT(15);
      __raw_writel(reg, S3C64XX_GPNCON);

      reg = __raw_readl(S3C64XX_GPNDAT);
      reg &= ~(clear << 12);
      reg |= set << 12;
      __raw_writel(reg, S3C64XX_GPNDAT);

      local_irq_restore(flags);
}
#endif

static struct sleep_save core_save[] = {
      SAVE_ITEM(S3C_APLL_LOCK),
      SAVE_ITEM(S3C_MPLL_LOCK),
      SAVE_ITEM(S3C_EPLL_LOCK),
      SAVE_ITEM(S3C_CLK_SRC),
      SAVE_ITEM(S3C_CLK_DIV0),
      SAVE_ITEM(S3C_CLK_DIV1),
      SAVE_ITEM(S3C_CLK_DIV2),
      SAVE_ITEM(S3C_CLK_OUT),
      SAVE_ITEM(S3C_HCLK_GATE),
      SAVE_ITEM(S3C_PCLK_GATE),
      SAVE_ITEM(S3C_SCLK_GATE),
      SAVE_ITEM(S3C_MEM0_GATE),

      SAVE_ITEM(S3C_EPLL_CON1),
      SAVE_ITEM(S3C_EPLL_CON0),

      SAVE_ITEM(S3C64XX_MEM0DRVCON),
      SAVE_ITEM(S3C64XX_MEM1DRVCON),

#ifndef CONFIG_CPU_FREQ
      SAVE_ITEM(S3C_APLL_CON),
      SAVE_ITEM(S3C_MPLL_CON),
#endif
};

static struct sleep_save misc_save[] = {
      SAVE_ITEM(S3C64XX_AHB_CON0),
      SAVE_ITEM(S3C64XX_AHB_CON1),
      SAVE_ITEM(S3C64XX_AHB_CON2),
      
      SAVE_ITEM(S3C64XX_SPCON),

      SAVE_ITEM(S3C64XX_MEM0CONSTOP),
      SAVE_ITEM(S3C64XX_MEM1CONSTOP),
      SAVE_ITEM(S3C64XX_MEM0CONSLP0),
      SAVE_ITEM(S3C64XX_MEM0CONSLP1),
      SAVE_ITEM(S3C64XX_MEM1CONSLP),
};

void s3c_pm_configure_extint(void)
{
      __raw_writel(s3c_irqwake_eintmask, S3C64XX_EINT_MASK);
}

void s3c_pm_restore_core(void)
{
      __raw_writel(0, S3C64XX_EINT_MASK);

      s3c_pm_debug_smdkled(1 << 2, 0);

      s3c_pm_do_restore_core(core_save, ARRAY_SIZE(core_save));
      s3c_pm_do_restore(misc_save, ARRAY_SIZE(misc_save));
}

void s3c_pm_save_core(void)
{
      s3c_pm_do_save(misc_save, ARRAY_SIZE(misc_save));
      s3c_pm_do_save(core_save, ARRAY_SIZE(core_save));
}

/* since both s3c6400 and s3c6410 share the same sleep pm calls, we
 * put the per-cpu code in here until any new cpu comes along and changes
 * this.
 */

static void s3c64xx_cpu_suspend(void)
{
      unsigned long tmp;

      /* set our standby method to sleep */

      tmp = __raw_readl(S3C64XX_PWR_CFG);
      tmp &= ~S3C64XX_PWRCFG_CFG_WFI_MASK;
      tmp |= S3C64XX_PWRCFG_CFG_WFI_SLEEP;
      __raw_writel(tmp, S3C64XX_PWR_CFG);

      /* clear any old wakeup */

      __raw_writel(__raw_readl(S3C64XX_WAKEUP_STAT),
                 S3C64XX_WAKEUP_STAT);

      /* set the LED state to 0110 over sleep */
      s3c_pm_debug_smdkled(3 << 1, 0xf);

      /* issue the standby signal into the pm unit. Note, we
       * issue a write-buffer drain just in case */

      tmp = 0;

      asm("b 1f\n\t"
          ".align 5\n\t"
          "1:\n\t"
          "mcr p15, 0, %0, c7, c10, 5\n\t"
          "mcr p15, 0, %0, c7, c10, 4\n\t"
          "mcr p15, 0, %0, c7, c0, 4" :: "r" (tmp));

      /* we should never get past here */

      panic("sleep resumed to originator?");
}

/* mapping of interrupts to parts of the wakeup mask */
static struct samsung_wakeup_mask wake_irqs[] = {
      { .irq = IRQ_RTC_ALARM, .bit = S3C64XX_PWRCFG_RTC_ALARM_DISABLE, },
      { .irq = IRQ_RTC_TIC,   .bit = S3C64XX_PWRCFG_RTC_TICK_DISABLE, },
      { .irq = IRQ_PENDN,     .bit = S3C64XX_PWRCFG_TS_DISABLE, },
      { .irq = IRQ_HSMMC0,    .bit = S3C64XX_PWRCFG_MMC0_DISABLE, },
      { .irq = IRQ_HSMMC1,    .bit = S3C64XX_PWRCFG_MMC1_DISABLE, },
      { .irq = IRQ_HSMMC2,    .bit = S3C64XX_PWRCFG_MMC2_DISABLE, },
      { .irq = NO_WAKEUP_IRQ, .bit = S3C64XX_PWRCFG_BATF_DISABLE},
      { .irq = NO_WAKEUP_IRQ, .bit = S3C64XX_PWRCFG_MSM_DISABLE },
      { .irq = NO_WAKEUP_IRQ, .bit = S3C64XX_PWRCFG_HSI_DISABLE },
      { .irq = NO_WAKEUP_IRQ, .bit = S3C64XX_PWRCFG_MSM_DISABLE },
};

static void s3c64xx_pm_prepare(void)
{
      samsung_sync_wakemask(S3C64XX_PWR_CFG,
                        wake_irqs, ARRAY_SIZE(wake_irqs));

      /* store address of resume. */
      __raw_writel(virt_to_phys(s3c_cpu_resume), S3C64XX_INFORM0);

      /* ensure previous wakeup state is cleared before sleeping */
      __raw_writel(__raw_readl(S3C64XX_WAKEUP_STAT), S3C64XX_WAKEUP_STAT);
}

static int s3c64xx_pm_init(void)
{
      pm_cpu_prep = s3c64xx_pm_prepare;
      pm_cpu_sleep = s3c64xx_cpu_suspend;
      pm_uart_udivslot = 1;
      return 0;
}

arch_initcall(s3c64xx_pm_init);

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