arch/arm/mach-s5p64x0/pm.c

   1 /* linux/arch/arm/mach-s5p64x0/pm.c
   2  *
   3  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   4  *              http://www.samsung.com
   5  *
   6  * S5P64X0 Power Management Support
   7  *
   8  * Based on arch/arm/mach-s3c64xx/pm.c by Ben Dooks
   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/suspend.h>
  16 #include <linux/syscore_ops.h>
  17 #include <linux/io.h>
  18
  19 #include <plat/cpu.h>
  20 #include <plat/pm.h>
  21 #include <plat/wakeup-mask.h>
  22
  23 #include <mach/regs-clock.h>
  24 #include <mach/regs-gpio.h>
  25
  26 static struct sleep_save s5p64x0_core_save[] = {
  27         SAVE_ITEM(S5P64X0_APLL_CON),
  28         SAVE_ITEM(S5P64X0_MPLL_CON),
  29         SAVE_ITEM(S5P64X0_EPLL_CON),
  30         SAVE_ITEM(S5P64X0_EPLL_CON_K),
  31         SAVE_ITEM(S5P64X0_CLK_SRC0),
  32         SAVE_ITEM(S5P64X0_CLK_SRC1),
  33         SAVE_ITEM(S5P64X0_CLK_DIV0),
  34         SAVE_ITEM(S5P64X0_CLK_DIV1),
  35         SAVE_ITEM(S5P64X0_CLK_DIV2),
  36         SAVE_ITEM(S5P64X0_CLK_DIV3),
  37         SAVE_ITEM(S5P64X0_CLK_GATE_MEM0),
  38         SAVE_ITEM(S5P64X0_CLK_GATE_HCLK1),
  39         SAVE_ITEM(S5P64X0_CLK_GATE_SCLK1),
  40 };
  41
  42 static struct sleep_save s5p64x0_misc_save[] = {
  43         SAVE_ITEM(S5P64X0_AHB_CON0),
  44         SAVE_ITEM(S5P64X0_SPCON0),
  45         SAVE_ITEM(S5P64X0_SPCON1),
  46         SAVE_ITEM(S5P64X0_MEM0CONSLP0),
  47         SAVE_ITEM(S5P64X0_MEM0CONSLP1),
  48         SAVE_ITEM(S5P64X0_MEM0DRVCON),
  49         SAVE_ITEM(S5P64X0_MEM1DRVCON),
  50 };
  51
  52 /* DPLL is present only in S5P6450 */
  53 static struct sleep_save s5p6450_core_save[] = {
  54         SAVE_ITEM(S5P6450_DPLL_CON),
  55         SAVE_ITEM(S5P6450_DPLL_CON_K),
  56 };
  57
  58 void s3c_pm_configure_extint(void)
  59 {
  60         __raw_writel(s3c_irqwake_eintmask, S5P64X0_EINT_WAKEUP_MASK);
  61 }
  62
  63 void s3c_pm_restore_core(void)
  64 {
  65         __raw_writel(0, S5P64X0_EINT_WAKEUP_MASK);
  66
  67         s3c_pm_do_restore_core(s5p64x0_core_save,
  68                                 ARRAY_SIZE(s5p64x0_core_save));
  69
  70         if (soc_is_s5p6450())
  71                 s3c_pm_do_restore_core(s5p6450_core_save,
  72                                 ARRAY_SIZE(s5p6450_core_save));
  73
  74         s3c_pm_do_restore(s5p64x0_misc_save, ARRAY_SIZE(s5p64x0_misc_save));
  75 }
  76
  77 void s3c_pm_save_core(void)
  78 {
  79         s3c_pm_do_save(s5p64x0_misc_save, ARRAY_SIZE(s5p64x0_misc_save));
  80
  81         if (soc_is_s5p6450())
  82                 s3c_pm_do_save(s5p6450_core_save,
  83                                 ARRAY_SIZE(s5p6450_core_save));
  84
  85         s3c_pm_do_save(s5p64x0_core_save, ARRAY_SIZE(s5p64x0_core_save));
  86 }
  87
  88 static int s5p64x0_cpu_suspend(unsigned long arg)
  89 {
  90         unsigned long tmp = 0;
  91
  92         /*
  93          * Issue the standby signal into the pm unit. Note, we
  94          * issue a write-buffer drain just in case.
  95          */
  96         asm("b 1f\n\t"
  97             ".align 5\n\t"
  98             "1:\n\t"
  99             "mcr p15, 0, %0, c7, c10, 5\n\t"
 100             "mcr p15, 0, %0, c7, c10, 4\n\t"
 101             "mcr p15, 0, %0, c7, c0, 4" : : "r" (tmp));
 102
 103         pr_info("Failed to suspend the system\n");
 104         return 1; /* Aborting suspend */
 105 }
 106
 107 /* mapping of interrupts to parts of the wakeup mask */
 108 static struct samsung_wakeup_mask s5p64x0_wake_irqs[] = {
 109         { .irq = IRQ_RTC_ALARM, .bit = S5P64X0_PWR_CFG_RTC_ALRM_DISABLE, },
 110         { .irq = IRQ_RTC_TIC,   .bit = S5P64X0_PWR_CFG_RTC_TICK_DISABLE, },
 111         { .irq = IRQ_HSMMC0,    .bit = S5P64X0_PWR_CFG_MMC0_DISABLE, },
 112         { .irq = IRQ_HSMMC1,    .bit = S5P64X0_PWR_CFG_MMC1_DISABLE, },
 113 };
 114
 115 static void s5p64x0_pm_prepare(void)
 116 {
 117         u32 tmp;
 118
 119         samsung_sync_wakemask(S5P64X0_PWR_CFG,
 120                         s5p64x0_wake_irqs, ARRAY_SIZE(s5p64x0_wake_irqs));
 121
 122         /* store the resume address in INFORM0 register */
 123         __raw_writel(virt_to_phys(s3c_cpu_resume), S5P64X0_INFORM0);
 124
 125         /* setup clock gating for FIMGVG block */
 126         __raw_writel((__raw_readl(S5P64X0_CLK_GATE_HCLK1) | \
 127                 (S5P64X0_CLK_GATE_HCLK1_FIMGVG)), S5P64X0_CLK_GATE_HCLK1);
 128         __raw_writel((__raw_readl(S5P64X0_CLK_GATE_SCLK1) | \
 129                 (S5P64X0_CLK_GATE_SCLK1_FIMGVG)), S5P64X0_CLK_GATE_SCLK1);
 130
 131         /* Configure the stabilization counter with wait time required */
 132         __raw_writel(S5P64X0_PWR_STABLE_PWR_CNT_VAL4, S5P64X0_PWR_STABLE);
 133
 134         /* set WFI to SLEEP mode configuration */
 135         tmp = __raw_readl(S5P64X0_SLEEP_CFG);
 136         tmp &= ~(S5P64X0_SLEEP_CFG_OSC_EN);
 137         __raw_writel(tmp, S5P64X0_SLEEP_CFG);
 138
 139         tmp = __raw_readl(S5P64X0_PWR_CFG);
 140         tmp &= ~(S5P64X0_PWR_CFG_WFI_MASK);
 141         tmp |= S5P64X0_PWR_CFG_WFI_SLEEP;
 142         __raw_writel(tmp, S5P64X0_PWR_CFG);
 143
 144         /*
 145          * set OTHERS register to disable interrupt before going to
 146          * sleep. This bit is present only in S5P6450, it is reserved
 147          * in S5P6440.
 148          */
 149         if (soc_is_s5p6450()) {
 150                 tmp = __raw_readl(S5P64X0_OTHERS);
 151                 tmp |= S5P6450_OTHERS_DISABLE_INT;
 152                 __raw_writel(tmp, S5P64X0_OTHERS);
 153         }
 154
 155         /* ensure previous wakeup state is cleared before sleeping */
 156         __raw_writel(__raw_readl(S5P64X0_WAKEUP_STAT), S5P64X0_WAKEUP_STAT);
 157
 158 }
 159
 160 static int s5p64x0_pm_add(struct device *dev, struct subsys_interface *sif)
 161 {
 162         pm_cpu_prep = s5p64x0_pm_prepare;
 163         pm_cpu_sleep = s5p64x0_cpu_suspend;
 164
 165         return 0;
 166 }
 167
 168 static struct subsys_interface s5p64x0_pm_interface = {
 169         .name           = "s5p64x0_pm",
 170         .subsys         = &s5p64x0_subsys,
 171         .add_dev        = s5p64x0_pm_add,
 172 };
 173
 174 static __init int s5p64x0_pm_drvinit(void)
 175 {
 176         s3c_pm_init();
 177
 178         return subsys_interface_register(&s5p64x0_pm_interface);
 179 }
 180 arch_initcall(s5p64x0_pm_drvinit);
 181
 182 static void s5p64x0_pm_resume(void)
 183 {
 184         u32 tmp;
 185
 186         tmp = __raw_readl(S5P64X0_OTHERS);
 187         tmp |= (S5P64X0_OTHERS_RET_MMC0 | S5P64X0_OTHERS_RET_MMC1 | \
 188                         S5P64X0_OTHERS_RET_UART);
 189         __raw_writel(tmp , S5P64X0_OTHERS);
 190 }
 191
 192 static struct syscore_ops s5p64x0_pm_syscore_ops = {
 193         .resume         = s5p64x0_pm_resume,
 194 };
 195
 196 static __init int s5p64x0_pm_syscore_init(void)
 197 {
 198         register_syscore_ops(&s5p64x0_pm_syscore_ops);
 199
 200         return 0;
 201 }
 202 arch_initcall(s5p64x0_pm_syscore_init);