arch/arm/plat-s3c64xx/pm.c

   1 /* linux/arch/arm/plat-s3c64xx/pm.c
   2  *
   3  * Copyright 2008 Openmoko, Inc.
   4  * Copyright 2008 Simtec Electronics
   5  *      Ben Dooks <ben@simtec.co.uk>
   6  *      http://armlinux.simtec.co.uk/
   7  *
   8  * S3C64XX CPU PM support.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13 */
  14
  15 #include <linux/init.h>
  16 #include <linux/suspend.h>
  17 #include <linux/serial_core.h>
  18 #include <linux/io.h>
  19
  20 #include <mach/map.h>
  21
  22 #include <plat/pm.h>
  23 #include <plat/regs-sys.h>
  24 #include <plat/regs-gpio.h>
  25 #include <plat/regs-clock.h>
  26 #include <plat/regs-syscon-power.h>
  27 #include <plat/regs-gpio-memport.h>
  28
  29 #ifdef CONFIG_S3C_PM_DEBUG_LED_SMDK
  30 #include <plat/gpio-bank-n.h>
  31
  32 void s3c_pm_debug_smdkled(u32 set, u32 clear)
  33 {
  34         unsigned long flags;
  35         u32 reg;
  36
  37         local_irq_save(flags);
  38         reg = __raw_readl(S3C64XX_GPNCON);
  39         reg &= ~(S3C64XX_GPN_CONMASK(12) | S3C64XX_GPN_CONMASK(13) |
  40                  S3C64XX_GPN_CONMASK(14) | S3C64XX_GPN_CONMASK(15));
  41         reg |= S3C64XX_GPN_OUTPUT(12) | S3C64XX_GPN_OUTPUT(13) |
  42                S3C64XX_GPN_OUTPUT(14) | S3C64XX_GPN_OUTPUT(15);
  43         __raw_writel(reg, S3C64XX_GPNCON);
  44
  45         reg = __raw_readl(S3C64XX_GPNDAT);
  46         reg &= ~(clear << 12);
  47         reg |= set << 12;
  48         __raw_writel(reg, S3C64XX_GPNDAT);
  49
  50         local_irq_restore(flags);
  51 }
  52 #endif
  53
  54 static struct sleep_save core_save[] = {
  55         SAVE_ITEM(S3C_APLL_LOCK),
  56         SAVE_ITEM(S3C_MPLL_LOCK),
  57         SAVE_ITEM(S3C_EPLL_LOCK),
  58         SAVE_ITEM(S3C_CLK_SRC),
  59         SAVE_ITEM(S3C_CLK_DIV0),
  60         SAVE_ITEM(S3C_CLK_DIV1),
  61         SAVE_ITEM(S3C_CLK_DIV2),
  62         SAVE_ITEM(S3C_CLK_OUT),
  63         SAVE_ITEM(S3C_HCLK_GATE),
  64         SAVE_ITEM(S3C_PCLK_GATE),
  65         SAVE_ITEM(S3C_SCLK_GATE),
  66         SAVE_ITEM(S3C_MEM0_GATE),
  67
  68         SAVE_ITEM(S3C_EPLL_CON1),
  69         SAVE_ITEM(S3C_EPLL_CON0),
  70
  71         SAVE_ITEM(S3C64XX_MEM0DRVCON),
  72         SAVE_ITEM(S3C64XX_MEM1DRVCON),
  73
  74 #ifndef CONFIG_CPU_FREQ
  75         SAVE_ITEM(S3C_APLL_CON),
  76         SAVE_ITEM(S3C_MPLL_CON),
  77 #endif
  78 };
  79
  80 static struct sleep_save misc_save[] = {
  81         SAVE_ITEM(S3C64XX_AHB_CON0),
  82         SAVE_ITEM(S3C64XX_AHB_CON1),
  83         SAVE_ITEM(S3C64XX_AHB_CON2),
  84
  85         SAVE_ITEM(S3C64XX_SPCON),
  86
  87         SAVE_ITEM(S3C64XX_MEM0CONSTOP),
  88         SAVE_ITEM(S3C64XX_MEM1CONSTOP),
  89         SAVE_ITEM(S3C64XX_MEM0CONSLP0),
  90         SAVE_ITEM(S3C64XX_MEM0CONSLP1),
  91         SAVE_ITEM(S3C64XX_MEM1CONSLP),
  92 };
  93
  94 void s3c_pm_configure_extint(void)
  95 {
  96         __raw_writel(s3c_irqwake_eintmask, S3C64XX_EINT_MASK);
  97 }
  98
  99 void s3c_pm_restore_core(void)
 100 {
 101         __raw_writel(0, S3C64XX_EINT_MASK);
 102
 103         s3c_pm_debug_smdkled(1 << 2, 0);
 104
 105         s3c_pm_do_restore_core(core_save, ARRAY_SIZE(core_save));
 106         s3c_pm_do_restore(misc_save, ARRAY_SIZE(misc_save));
 107 }
 108
 109 void s3c_pm_save_core(void)
 110 {
 111         s3c_pm_do_save(misc_save, ARRAY_SIZE(misc_save));
 112         s3c_pm_do_save(core_save, ARRAY_SIZE(core_save));
 113 }
 114
 115 /* since both s3c6400 and s3c6410 share the same sleep pm calls, we
 116  * put the per-cpu code in here until any new cpu comes along and changes
 117  * this.
 118  */
 119
 120 static void s3c64xx_cpu_suspend(void)
 121 {
 122         unsigned long tmp;
 123
 124         /* set our standby method to sleep */
 125
 126         tmp = __raw_readl(S3C64XX_PWR_CFG);
 127         tmp &= ~S3C64XX_PWRCFG_CFG_WFI_MASK;
 128         tmp |= S3C64XX_PWRCFG_CFG_WFI_SLEEP;
 129         __raw_writel(tmp, S3C64XX_PWR_CFG);
 130
 131         /* clear any old wakeup */
 132
 133         __raw_writel(__raw_readl(S3C64XX_WAKEUP_STAT),
 134                      S3C64XX_WAKEUP_STAT);
 135
 136         /* set the LED state to 0110 over sleep */
 137         s3c_pm_debug_smdkled(3 << 1, 0xf);
 138
 139         /* issue the standby signal into the pm unit. Note, we
 140          * issue a write-buffer drain just in case */
 141
 142         tmp = 0;
 143
 144         asm("b 1f\n\t"
 145             ".align 5\n\t"
 146             "1:\n\t"
 147             "mcr p15, 0, %0, c7, c10, 5\n\t"
 148             "mcr p15, 0, %0, c7, c10, 4\n\t"
 149             "mcr p15, 0, %0, c7, c0, 4" :: "r" (tmp));
 150
 151         /* we should never get past here */
 152
 153         panic("sleep resumed to originator?");
 154 }
 155
 156 static void s3c64xx_pm_prepare(void)
 157 {
 158         /* store address of resume. */
 159         __raw_writel(virt_to_phys(s3c_cpu_resume), S3C64XX_INFORM0);
 160
 161         /* ensure previous wakeup state is cleared before sleeping */
 162         __raw_writel(__raw_readl(S3C64XX_WAKEUP_STAT), S3C64XX_WAKEUP_STAT);
 163 }
 164
 165 static int s3c64xx_pm_init(void)
 166 {
 167         pm_cpu_prep = s3c64xx_pm_prepare;
 168         pm_cpu_sleep = s3c64xx_cpu_suspend;
 169         pm_uart_udivslot = 1;
 170         return 0;
 171 }
 172
 173 arch_initcall(s3c64xx_pm_init);