LXR linux/arch/powerpc/platforms/52xx/mpc52xx

   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 */
   9extern void mpc52xx_deep_sleep(void __iomem *sram, void __iomem *sdram_regs,
  10                struct mpc52xx_cdm __iomem *, struct mpc52xx_intr __iomem*);
  11extern void mpc52xx_ds_sram(void);
  12extern const long mpc52xx_ds_sram_size;
  13extern void mpc52xx_ds_cached(void);
  14extern const long mpc52xx_ds_cached_size;
  15
  16static void __iomem *mbar;
  17static void __iomem *sdram;
  18static struct mpc52xx_cdm __iomem *cdm;
  19static struct mpc52xx_intr __iomem *intr;
  20static struct mpc52xx_gpio_wkup __iomem *gpiow;
  21static void __iomem *sram;
  22static int sram_size;
  23
  24struct mpc52xx_suspend mpc52xx_suspend;
  25
  26static 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
  36int 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
  57int 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
 101char saved_sram[0x4000];
 102
 103int 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
 174void 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
 183static 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
 190int __init mpc52xx_pm_init(void)
 191{
 192        suspend_set_ops(&mpc52xx_pm_ops);
 193        return 0;
 194}
 195