Logo Search packages:      
Sourcecode: linux version File versions  Download package

pm.c

/* linux/arch/arm/mach-s5pv210/pm.c
 *
 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
 *          http://www.samsung.com
 *
 * S5PV210 - Power Management support
 *
 * Based on arch/arm/mach-s3c2410/pm.c
 * Copyright (c) 2006 Simtec Electronics
 *    Ben Dooks <ben@simtec.co.uk>
 *
 * 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/io.h>

#include <plat/cpu.h>
#include <plat/pm.h>
#include <plat/regs-timer.h>

#include <mach/regs-irq.h>
#include <mach/regs-clock.h>

static struct sleep_save s5pv210_core_save[] = {
      /* Clock source */
      SAVE_ITEM(S5P_CLK_SRC0),
      SAVE_ITEM(S5P_CLK_SRC1),
      SAVE_ITEM(S5P_CLK_SRC2),
      SAVE_ITEM(S5P_CLK_SRC3),
      SAVE_ITEM(S5P_CLK_SRC4),
      SAVE_ITEM(S5P_CLK_SRC5),
      SAVE_ITEM(S5P_CLK_SRC6),

      /* Clock source Mask */
      SAVE_ITEM(S5P_CLK_SRC_MASK0),
      SAVE_ITEM(S5P_CLK_SRC_MASK1),

      /* Clock Divider */
      SAVE_ITEM(S5P_CLK_DIV0),
      SAVE_ITEM(S5P_CLK_DIV1),
      SAVE_ITEM(S5P_CLK_DIV2),
      SAVE_ITEM(S5P_CLK_DIV3),
      SAVE_ITEM(S5P_CLK_DIV4),
      SAVE_ITEM(S5P_CLK_DIV5),
      SAVE_ITEM(S5P_CLK_DIV6),
      SAVE_ITEM(S5P_CLK_DIV7),

      /* Clock Main Gate */
      SAVE_ITEM(S5P_CLKGATE_MAIN0),
      SAVE_ITEM(S5P_CLKGATE_MAIN1),
      SAVE_ITEM(S5P_CLKGATE_MAIN2),

      /* Clock source Peri Gate */
      SAVE_ITEM(S5P_CLKGATE_PERI0),
      SAVE_ITEM(S5P_CLKGATE_PERI1),

      /* Clock source SCLK Gate */
      SAVE_ITEM(S5P_CLKGATE_SCLK0),
      SAVE_ITEM(S5P_CLKGATE_SCLK1),

      /* Clock IP Clock gate */
      SAVE_ITEM(S5P_CLKGATE_IP0),
      SAVE_ITEM(S5P_CLKGATE_IP1),
      SAVE_ITEM(S5P_CLKGATE_IP2),
      SAVE_ITEM(S5P_CLKGATE_IP3),
      SAVE_ITEM(S5P_CLKGATE_IP4),

      /* Clock Blcok and Bus gate */
      SAVE_ITEM(S5P_CLKGATE_BLOCK),
      SAVE_ITEM(S5P_CLKGATE_BUS0),

      /* Clock ETC */
      SAVE_ITEM(S5P_CLK_OUT),
      SAVE_ITEM(S5P_MDNIE_SEL),

      /* PWM Register */
      SAVE_ITEM(S3C2410_TCFG0),
      SAVE_ITEM(S3C2410_TCFG1),
      SAVE_ITEM(S3C64XX_TINT_CSTAT),
      SAVE_ITEM(S3C2410_TCON),
      SAVE_ITEM(S3C2410_TCNTB(0)),
      SAVE_ITEM(S3C2410_TCMPB(0)),
      SAVE_ITEM(S3C2410_TCNTO(0)),
};

void s5pv210_cpu_suspend(void)
{
      unsigned long tmp;

      /* 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"
          "wfi" : : "r" (tmp));

      /* we should never get past here */
      panic("sleep resumed to originator?");
}

static void s5pv210_pm_prepare(void)
{
      unsigned int tmp;

      /* ensure at least INFORM0 has the resume address */
      __raw_writel(virt_to_phys(s3c_cpu_resume), S5P_INFORM0);

      tmp = __raw_readl(S5P_SLEEP_CFG);
      tmp &= ~(S5P_SLEEP_CFG_OSC_EN | S5P_SLEEP_CFG_USBOSC_EN);
      __raw_writel(tmp, S5P_SLEEP_CFG);

      /* WFI for SLEEP mode configuration by SYSCON */
      tmp = __raw_readl(S5P_PWR_CFG);
      tmp &= S5P_CFG_WFI_CLEAN;
      tmp |= S5P_CFG_WFI_SLEEP;
      __raw_writel(tmp, S5P_PWR_CFG);

      /* SYSCON interrupt handling disable */
      tmp = __raw_readl(S5P_OTHERS);
      tmp |= S5P_OTHER_SYSC_INTOFF;
      __raw_writel(tmp, S5P_OTHERS);

      s3c_pm_do_save(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save));
}

static int s5pv210_pm_add(struct sys_device *sysdev)
{
      pm_cpu_prep = s5pv210_pm_prepare;
      pm_cpu_sleep = s5pv210_cpu_suspend;

      return 0;
}

static int s5pv210_pm_resume(struct sys_device *dev)
{
      u32 tmp;

      tmp = __raw_readl(S5P_OTHERS);
      tmp |= (S5P_OTHERS_RET_IO | S5P_OTHERS_RET_CF |\
            S5P_OTHERS_RET_MMC | S5P_OTHERS_RET_UART);
      __raw_writel(tmp , S5P_OTHERS);

      s3c_pm_do_restore_core(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save));

      return 0;
}

static struct sysdev_driver s5pv210_pm_driver = {
      .add        = s5pv210_pm_add,
      .resume           = s5pv210_pm_resume,
};

static __init int s5pv210_pm_drvinit(void)
{
      return sysdev_driver_register(&s5pv210_sysclass, &s5pv210_pm_driver);
}
arch_initcall(s5pv210_pm_drvinit);

Generated by  Doxygen 1.6.0   Back to index