arch/powerpc/platforms/52xx/mpc52xx_pm.c

   1 #include <linux/init.h>
   2 #include <linux/suspend.h>
   3 #include <linux/io.h>
   4 #include <asm/time.h>
   5 #include <asm/cacheflush.h>
   6 #include <asm/mpc52xx.h>
   7
   8 /* these are defined in mpc52xx_sleep.S, and only used here */
   9 extern void mpc52xx_deep_sleep(void __iomem *sram, void __iomem *sdram_regs,
  10                 struct mpc52xx_cdm __iomem *, struct mpc52xx_intr __iomem*);
  11 extern void mpc52xx_ds_sram(void);
  12 extern const long mpc52xx_ds_sram_size;
  13 extern void mpc52xx_ds_cached(void);
  14 extern const long mpc52xx_ds_cached_size;
  15
  16 static void __iomem *mbar;
  17 static void __iomem *sdram;
  18 static struct mpc52xx_cdm __iomem *cdm;
  19 static struct mpc52xx_intr __iomem *intr;
  20 static struct mpc52xx_gpio_wkup __iomem *gpiow;
  21 static void __iomem *sram;
  22 static int sram_size;
  23
  24 struct mpc52xx_suspend mpc52xx_suspend;
  25
  26 static int mpc52xx_pm_valid(suspend_state_t state)
  27 {
  28         switch (state) {
  29         case PM_SUSPEND_STANDBY:
  30                 return 1;
  31         default:
  32                 return 0;
  33         }
  34 }
  35
  36 int mpc52xx_set_wakeup_gpio(u8 pin, u8 level)
  37 {
  38         u16 tmp;
  39
  40         /* enable gpio */
  41         out_8(&gpiow->wkup_gpioe, in_8(&gpiow->wkup_gpioe) | (1 << pin));
  42         /* set as input */
  43         out_8(&gpiow->wkup_ddr, in_8(&gpiow->wkup_ddr) & ~(1 << pin));
  44         /* enable deep sleep interrupt */
  45         out_8(&gpiow->wkup_inten, in_8(&gpiow->wkup_inten) | (1 << pin));
  46         /* low/high level creates wakeup interrupt */
  47         tmp = in_be16(&gpiow->wkup_itype);
  48         tmp &= ~(0x3 << (pin * 2));
  49         tmp |= (!level + 1) << (pin * 2);
  50         out_be16(&gpiow->wkup_itype, tmp);
  51         /* master enable */
  52         out_8(&gpiow->wkup_maste, 1);
  53
  54         return 0;
  55 }
  56
  57 int mpc52xx_pm_prepare(void)
  58 {
  59         struct device_node *np;
  60         const struct of_device_id immr_ids[] = {
  61                 { .compatible = "fsl,mpc5200-immr", },
  62                 { .compatible = "fsl,mpc5200b-immr", },
  63                 { .type = "soc", .compatible = "mpc5200", }, /* lite5200 */
  64                 { .type = "builtin", .compatible = "mpc5200", }, /* efika */
  65                 {}
  66         };
  67
  68         /* map the whole register space */
  69         np = of_find_matching_node(NULL, immr_ids);
  70         mbar = of_iomap(np, 0);
  71         of_node_put(np);
  72         if (!mbar) {
  73                 pr_err("mpc52xx_pm_prepare(): could not map registers\n");
  74                 return -ENOSYS;
  75         }
  76         /* these offsets are from mpc5200 users manual */
  77         sdram   = mbar + 0x100;
  78         cdm     = mbar + 0x200;
  79         intr    = mbar + 0x500;
  80         gpiow   = mbar + 0xc00;
  81         sram    = mbar + 0x8000;        /* Those will be handled by the */
  82         sram_size = 0x4000;             /* bestcomm driver soon */
  83
  84         /* call board suspend code, if applicable */
  85         if (mpc52xx_suspend.board_suspend_prepare)
  86                 mpc52xx_suspend.board_suspend_prepare(mbar);
  87         else {
  88                 printk(KERN_ALERT "%s: %i don't know how to wake up the board\n",
  89                                 __func__, __LINE__);
  90                 goto out_unmap;
  91         }
  92
  93         return 0;
  94
  95  out_unmap:
  96         iounmap(mbar);
  97         return -ENOSYS;
  98 }
  99
 100
 101 char saved_sram[0x4000];
 102
 103 int mpc52xx_pm_enter(suspend_state_t state)
 104 {
 105         u32 clk_enables;
 106         u32 msr, hid0;
 107         u32 intr_main_mask;
 108         void __iomem * irq_0x500 = (void __iomem *)CONFIG_KERNEL_START + 0x500;
 109         unsigned long irq_0x500_stop = (unsigned long)irq_0x500 + mpc52xx_ds_cached_size;
 110         char saved_0x500[mpc52xx_ds_cached_size];
 111
 112         /* disable all interrupts in PIC */
 113         intr_main_mask = in_be32(&intr->main_mask);
 114         out_be32(&intr->main_mask, intr_main_mask | 0x1ffff);
 115
 116         /* don't let DEC expire any time soon */
 117         mtspr(SPRN_DEC, 0x7fffffff);
 118
 119         /* save SRAM */
 120         memcpy(saved_sram, sram, sram_size);
 121
 122         /* copy low level suspend code to sram */
 123         memcpy(sram, mpc52xx_ds_sram, mpc52xx_ds_sram_size);
 124
 125         out_8(&cdm->ccs_sleep_enable, 1);
 126         out_8(&cdm->osc_sleep_enable, 1);
 127         out_8(&cdm->ccs_qreq_test, 1);
 128
 129         /* disable all but SDRAM and bestcomm (SRAM) clocks */
 130         clk_enables = in_be32(&cdm->clk_enables);
 131         out_be32(&cdm->clk_enables, clk_enables & 0x00088000);
 132
 133         /* disable power management */
 134         msr = mfmsr();
 135         mtmsr(msr & ~MSR_POW);
 136
 137         /* enable sleep mode, disable others */
 138         hid0 = mfspr(SPRN_HID0);
 139         mtspr(SPRN_HID0, (hid0 & ~(HID0_DOZE | HID0_NAP | HID0_DPM)) | HID0_SLEEP);
 140
 141         /* save original, copy our irq handler, flush from dcache and invalidate icache */
 142         memcpy(saved_0x500, irq_0x500, mpc52xx_ds_cached_size);
 143         memcpy(irq_0x500, mpc52xx_ds_cached, mpc52xx_ds_cached_size);
 144         flush_icache_range((unsigned long)irq_0x500, irq_0x500_stop);
 145
 146         /* call low-level sleep code */
 147         mpc52xx_deep_sleep(sram, sdram, cdm, intr);
 148
 149         /* restore original irq handler */
 150         memcpy(irq_0x500, saved_0x500, mpc52xx_ds_cached_size);
 151         flush_icache_range((unsigned long)irq_0x500, irq_0x500_stop);
 152
 153         /* restore old power mode */
 154         mtmsr(msr & ~MSR_POW);
 155         mtspr(SPRN_HID0, hid0);
 156         mtmsr(msr);
 157
 158         out_be32(&cdm->clk_enables, clk_enables);
 159         out_8(&cdm->ccs_sleep_enable, 0);
 160         out_8(&cdm->osc_sleep_enable, 0);
 161
 162         /* restore SRAM */
 163         memcpy(sram, saved_sram, sram_size);
 164
 165         /* restart jiffies */
 166         wakeup_decrementer();
 167
 168         /* reenable interrupts in PIC */
 169         out_be32(&intr->main_mask, intr_main_mask);
 170
 171         return 0;
 172 }
 173
 174 void mpc52xx_pm_finish(void)
 175 {
 176         /* call board resume code */
 177         if (mpc52xx_suspend.board_resume_finish)
 178                 mpc52xx_suspend.board_resume_finish(mbar);
 179
 180         iounmap(mbar);
 181 }
 182
 183 static struct platform_suspend_ops mpc52xx_pm_ops = {
 184         .valid          = mpc52xx_pm_valid,
 185         .prepare        = mpc52xx_pm_prepare,
 186         .enter          = mpc52xx_pm_enter,
 187         .finish         = mpc52xx_pm_finish,
 188 };
 189
 190 int __init mpc52xx_pm_init(void)
 191 {
 192         suspend_set_ops(&mpc52xx_pm_ops);
 193         return 0;
 194 }