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 } 195