1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/init.h> 3 #include <linux/suspend.h> 4 #include <linux/io.h> 5 #include <linux/of_address.h> 6 7 #include <asm/time.h> 8 #include <asm/cacheflush.h> 9 #include <asm/mpc52xx.h> 10 11 /* these are defined in mpc52xx_sleep.S, and only used here */ 12 extern void mpc52xx_deep_sleep(void __iomem *sram, void __iomem *sdram_regs, 13 struct mpc52xx_cdm __iomem *, struct mpc52xx_intr __iomem*); 14 extern void mpc52xx_ds_sram(void); 15 extern const long mpc52xx_ds_sram_size; 16 extern void mpc52xx_ds_cached(void); 17 extern const long mpc52xx_ds_cached_size; 18 19 static void __iomem *mbar; 20 static void __iomem *sdram; 21 static struct mpc52xx_cdm __iomem *cdm; 22 static struct mpc52xx_intr __iomem *intr; 23 static struct mpc52xx_gpio_wkup __iomem *gpiow; 24 static void __iomem *sram; 25 static int sram_size; 26 27 struct mpc52xx_suspend mpc52xx_suspend; 28 29 static int mpc52xx_pm_valid(suspend_state_t state) 30 { 31 switch (state) { 32 case PM_SUSPEND_STANDBY: 33 return 1; 34 default: 35 return 0; 36 } 37 } 38 39 int mpc52xx_set_wakeup_gpio(u8 pin, u8 level) 40 { 41 u16 tmp; 42 43 /* enable gpio */ 44 out_8(&gpiow->wkup_gpioe, in_8(&gpiow->wkup_gpioe) | (1 << pin)); 45 /* set as input */ 46 out_8(&gpiow->wkup_ddr, in_8(&gpiow->wkup_ddr) & ~(1 << pin)); 47 /* enable deep sleep interrupt */ 48 out_8(&gpiow->wkup_inten, in_8(&gpiow->wkup_inten) | (1 << pin)); 49 /* low/high level creates wakeup interrupt */ 50 tmp = in_be16(&gpiow->wkup_itype); 51 tmp &= ~(0x3 << (pin * 2)); 52 tmp |= (!level + 1) << (pin * 2); 53 out_be16(&gpiow->wkup_itype, tmp); 54 /* master enable */ 55 out_8(&gpiow->wkup_maste, 1); 56 57 return 0; 58 } 59 60 int mpc52xx_pm_prepare(void) 61 { 62 struct device_node *np; 63 static const struct of_device_id immr_ids[] = { 64 { .compatible = "fsl,mpc5200-immr", }, 65 { .compatible = "fsl,mpc5200b-immr", }, 66 { .type = "soc", .compatible = "mpc5200", }, /* lite5200 */ 67 { .type = "builtin", .compatible = "mpc5200", }, /* efika */ 68 {} 69 }; 70 struct resource res; 71 72 /* map the whole register space */ 73 np = of_find_matching_node(NULL, immr_ids); 74 75 if (of_address_to_resource(np, 0, &res)) { 76 pr_err("mpc52xx_pm_prepare(): could not get IMMR address\n"); 77 of_node_put(np); 78 return -ENOSYS; 79 } 80 81 mbar = ioremap(res.start, 0xc000); /* we should map whole region including SRAM */ 82 83 of_node_put(np); 84 if (!mbar) { 85 pr_err("mpc52xx_pm_prepare(): could not map registers\n"); 86 return -ENOSYS; 87 } 88 /* these offsets are from mpc5200 users manual */ 89 sdram = mbar + 0x100; 90 cdm = mbar + 0x200; 91 intr = mbar + 0x500; 92 gpiow = mbar + 0xc00; 93 sram = mbar + 0x8000; /* Those will be handled by the */ 94 sram_size = 0x4000; /* bestcomm driver soon */ 95 96 /* call board suspend code, if applicable */ 97 if (mpc52xx_suspend.board_suspend_prepare) 98 mpc52xx_suspend.board_suspend_prepare(mbar); 99 else { 100 printk(KERN_ALERT "%s: %i don't know how to wake up the board\n", 101 __func__, __LINE__); 102 goto out_unmap; 103 } 104 105 return 0; 106 107 out_unmap: 108 iounmap(mbar); 109 return -ENOSYS; 110 } 111 112 113 char saved_sram[0x4000]; 114 115 int mpc52xx_pm_enter(suspend_state_t state) 116 { 117 u32 clk_enables; 118 u32 msr, hid0; 119 u32 intr_main_mask; 120 void __iomem * irq_0x500 = (void __iomem *)CONFIG_KERNEL_START + 0x500; 121 unsigned long irq_0x500_stop = (unsigned long)irq_0x500 + mpc52xx_ds_cached_size; 122 char saved_0x500[0x600-0x500]; 123 124 if (WARN_ON(mpc52xx_ds_cached_size > sizeof(saved_0x500))) 125 return -ENOMEM; 126 127 /* disable all interrupts in PIC */ 128 intr_main_mask = in_be32(&intr->main_mask); 129 out_be32(&intr->main_mask, intr_main_mask | 0x1ffff); 130 131 /* don't let DEC expire any time soon */ 132 mtspr(SPRN_DEC, 0x7fffffff); 133 134 /* save SRAM */ 135 memcpy(saved_sram, sram, sram_size); 136 137 /* copy low level suspend code to sram */ 138 memcpy(sram, mpc52xx_ds_sram, mpc52xx_ds_sram_size); 139 140 out_8(&cdm->ccs_sleep_enable, 1); 141 out_8(&cdm->osc_sleep_enable, 1); 142 out_8(&cdm->ccs_qreq_test, 1); 143 144 /* disable all but SDRAM and bestcomm (SRAM) clocks */ 145 clk_enables = in_be32(&cdm->clk_enables); 146 out_be32(&cdm->clk_enables, clk_enables & 0x00088000); 147 148 /* disable power management */ 149 msr = mfmsr(); 150 mtmsr(msr & ~MSR_POW); 151 152 /* enable sleep mode, disable others */ 153 hid0 = mfspr(SPRN_HID0); 154 mtspr(SPRN_HID0, (hid0 & ~(HID0_DOZE | HID0_NAP | HID0_DPM)) | HID0_SLEEP); 155 156 /* save original, copy our irq handler, flush from dcache and invalidate icache */ 157 memcpy(saved_0x500, irq_0x500, mpc52xx_ds_cached_size); 158 memcpy(irq_0x500, mpc52xx_ds_cached, mpc52xx_ds_cached_size); 159 flush_icache_range((unsigned long)irq_0x500, irq_0x500_stop); 160 161 /* call low-level sleep code */ 162 mpc52xx_deep_sleep(sram, sdram, cdm, intr); 163 164 /* restore original irq handler */ 165 memcpy(irq_0x500, saved_0x500, mpc52xx_ds_cached_size); 166 flush_icache_range((unsigned long)irq_0x500, irq_0x500_stop); 167 168 /* restore old power mode */ 169 mtmsr(msr & ~MSR_POW); 170 mtspr(SPRN_HID0, hid0); 171 mtmsr(msr); 172 173 out_be32(&cdm->clk_enables, clk_enables); 174 out_8(&cdm->ccs_sleep_enable, 0); 175 out_8(&cdm->osc_sleep_enable, 0); 176 177 /* restore SRAM */ 178 memcpy(sram, saved_sram, sram_size); 179 180 /* reenable interrupts in PIC */ 181 out_be32(&intr->main_mask, intr_main_mask); 182 183 return 0; 184 } 185 186 void mpc52xx_pm_finish(void) 187 { 188 /* call board resume code */ 189 if (mpc52xx_suspend.board_resume_finish) 190 mpc52xx_suspend.board_resume_finish(mbar); 191 192 iounmap(mbar); 193 } 194 195 static const struct platform_suspend_ops mpc52xx_pm_ops = { 196 .valid = mpc52xx_pm_valid, 197 .prepare = mpc52xx_pm_prepare, 198 .enter = mpc52xx_pm_enter, 199 .finish = mpc52xx_pm_finish, 200 }; 201 202 int __init mpc52xx_pm_init(void) 203 { 204 suspend_set_ops(&mpc52xx_pm_ops); 205 return 0; 206 } 207