1 #include <linux/init.h> 2 #include <linux/suspend.h> 3 #include <asm/io.h> 4 #include <asm/time.h> 5 #include <asm/mpc52xx.h> 6 #include "mpc52xx_pic.h" 7 8 /* defined in lite5200_sleep.S and only used here */ 9 extern void lite5200_low_power(void __iomem *sram, void __iomem *mbar); 10 11 static struct mpc52xx_cdm __iomem *cdm; 12 static struct mpc52xx_intr __iomem *pic; 13 static struct mpc52xx_sdma __iomem *bes; 14 static struct mpc52xx_xlb __iomem *xlb; 15 static struct mpc52xx_gpio __iomem *gps; 16 static struct mpc52xx_gpio_wkup __iomem *gpw; 17 static void __iomem *sram; 18 static const int sram_size = 0x4000; /* 16 kBytes */ 19 static void __iomem *mbar; 20 21 static suspend_state_t lite5200_pm_target_state; 22 23 static int lite5200_pm_valid(suspend_state_t state) 24 { 25 switch (state) { 26 case PM_SUSPEND_STANDBY: 27 case PM_SUSPEND_MEM: 28 return 1; 29 default: 30 return 0; 31 } 32 } 33 34 static int lite5200_pm_begin(suspend_state_t state) 35 { 36 if (lite5200_pm_valid(state)) { 37 lite5200_pm_target_state = state; 38 return 0; 39 } 40 return -EINVAL; 41 } 42 43 static int lite5200_pm_prepare(void) 44 { 45 struct device_node *np; 46 const struct of_device_id immr_ids[] = { 47 { .compatible = "fsl,mpc5200-immr", }, 48 { .compatible = "fsl,mpc5200b-immr", }, 49 { .type = "soc", .compatible = "mpc5200", }, /* lite5200 */ 50 { .type = "builtin", .compatible = "mpc5200", }, /* efika */ 51 {} 52 }; 53 54 /* deep sleep? let mpc52xx code handle that */ 55 if (lite5200_pm_target_state == PM_SUSPEND_STANDBY) 56 return mpc52xx_pm_prepare(); 57 58 if (lite5200_pm_target_state != PM_SUSPEND_MEM) 59 return -EINVAL; 60 61 /* map registers */ 62 np = of_find_matching_node(NULL, immr_ids); 63 mbar = of_iomap(np, 0); 64 of_node_put(np); 65 if (!mbar) { 66 printk(KERN_ERR "%s:%i Error mapping registers\n", __func__, __LINE__); 67 return -ENOSYS; 68 } 69 70 cdm = mbar + 0x200; 71 pic = mbar + 0x500; 72 gps = mbar + 0xb00; 73 gpw = mbar + 0xc00; 74 bes = mbar + 0x1200; 75 xlb = mbar + 0x1f00; 76 sram = mbar + 0x8000; 77 78 return 0; 79 } 80 81 /* save and restore registers not bound to any real devices */ 82 static struct mpc52xx_cdm scdm; 83 static struct mpc52xx_intr spic; 84 static struct mpc52xx_sdma sbes; 85 static struct mpc52xx_xlb sxlb; 86 static struct mpc52xx_gpio sgps; 87 static struct mpc52xx_gpio_wkup sgpw; 88 89 static void lite5200_save_regs(void) 90 { 91 _memcpy_fromio(&spic, pic, sizeof(*pic)); 92 _memcpy_fromio(&sbes, bes, sizeof(*bes)); 93 _memcpy_fromio(&scdm, cdm, sizeof(*cdm)); 94 _memcpy_fromio(&sxlb, xlb, sizeof(*xlb)); 95 _memcpy_fromio(&sgps, gps, sizeof(*gps)); 96 _memcpy_fromio(&sgpw, gpw, sizeof(*gpw)); 97 98 _memcpy_fromio(saved_sram, sram, sram_size); 99 } 100 101 static void lite5200_restore_regs(void) 102 { 103 int i; 104 _memcpy_toio(sram, saved_sram, sram_size); 105 106 107 /* 108 * GPIOs. Interrupt Master Enable has higher address then other 109 * registers, so just memcpy is ok. 110 */ 111 _memcpy_toio(gpw, &sgpw, sizeof(*gpw)); 112 _memcpy_toio(gps, &sgps, sizeof(*gps)); 113 114 115 /* XLB Arbitrer */ 116 out_be32(&xlb->snoop_window, sxlb.snoop_window); 117 out_be32(&xlb->master_priority, sxlb.master_priority); 118 out_be32(&xlb->master_pri_enable, sxlb.master_pri_enable); 119 120 /* enable */ 121 out_be32(&xlb->int_enable, sxlb.int_enable); 122 out_be32(&xlb->config, sxlb.config); 123 124 125 /* CDM - Clock Distribution Module */ 126 out_8(&cdm->ipb_clk_sel, scdm.ipb_clk_sel); 127 out_8(&cdm->pci_clk_sel, scdm.pci_clk_sel); 128 129 out_8(&cdm->ext_48mhz_en, scdm.ext_48mhz_en); 130 out_8(&cdm->fd_enable, scdm.fd_enable); 131 out_be16(&cdm->fd_counters, scdm.fd_counters); 132 133 out_be32(&cdm->clk_enables, scdm.clk_enables); 134 135 out_8(&cdm->osc_disable, scdm.osc_disable); 136 137 out_be16(&cdm->mclken_div_psc1, scdm.mclken_div_psc1); 138 out_be16(&cdm->mclken_div_psc2, scdm.mclken_div_psc2); 139 out_be16(&cdm->mclken_div_psc3, scdm.mclken_div_psc3); 140 out_be16(&cdm->mclken_div_psc6, scdm.mclken_div_psc6); 141 142 143 /* BESTCOMM */ 144 out_be32(&bes->taskBar, sbes.taskBar); 145 out_be32(&bes->currentPointer, sbes.currentPointer); 146 out_be32(&bes->endPointer, sbes.endPointer); 147 out_be32(&bes->variablePointer, sbes.variablePointer); 148 149 out_8(&bes->IntVect1, sbes.IntVect1); 150 out_8(&bes->IntVect2, sbes.IntVect2); 151 out_be16(&bes->PtdCntrl, sbes.PtdCntrl); 152 153 for (i=0; i<32; i++) 154 out_8(&bes->ipr[i], sbes.ipr[i]); 155 156 out_be32(&bes->cReqSelect, sbes.cReqSelect); 157 out_be32(&bes->task_size0, sbes.task_size0); 158 out_be32(&bes->task_size1, sbes.task_size1); 159 out_be32(&bes->MDEDebug, sbes.MDEDebug); 160 out_be32(&bes->ADSDebug, sbes.ADSDebug); 161 out_be32(&bes->Value1, sbes.Value1); 162 out_be32(&bes->Value2, sbes.Value2); 163 out_be32(&bes->Control, sbes.Control); 164 out_be32(&bes->Status, sbes.Status); 165 out_be32(&bes->PTDDebug, sbes.PTDDebug); 166 167 /* restore tasks */ 168 for (i=0; i<16; i++) 169 out_be16(&bes->tcr[i], sbes.tcr[i]); 170 171 /* enable interrupts */ 172 out_be32(&bes->IntPend, sbes.IntPend); 173 out_be32(&bes->IntMask, sbes.IntMask); 174 175 176 /* PIC */ 177 out_be32(&pic->per_pri1, spic.per_pri1); 178 out_be32(&pic->per_pri2, spic.per_pri2); 179 out_be32(&pic->per_pri3, spic.per_pri3); 180 181 out_be32(&pic->main_pri1, spic.main_pri1); 182 out_be32(&pic->main_pri2, spic.main_pri2); 183 184 out_be32(&pic->enc_status, spic.enc_status); 185 186 /* unmask and enable interrupts */ 187 out_be32(&pic->per_mask, spic.per_mask); 188 out_be32(&pic->main_mask, spic.main_mask); 189 out_be32(&pic->ctrl, spic.ctrl); 190 } 191 192 static int lite5200_pm_enter(suspend_state_t state) 193 { 194 /* deep sleep? let mpc52xx code handle that */ 195 if (state == PM_SUSPEND_STANDBY) { 196 return mpc52xx_pm_enter(state); 197 } 198 199 lite5200_save_regs(); 200 201 /* effectively save FP regs */ 202 enable_kernel_fp(); 203 204 lite5200_low_power(sram, mbar); 205 206 lite5200_restore_regs(); 207 208 /* restart jiffies */ 209 wakeup_decrementer(); 210 211 iounmap(mbar); 212 return 0; 213 } 214 215 static void lite5200_pm_finish(void) 216 { 217 /* deep sleep? let mpc52xx code handle that */ 218 if (lite5200_pm_target_state == PM_SUSPEND_STANDBY) 219 mpc52xx_pm_finish(); 220 } 221 222 static void lite5200_pm_end(void) 223 { 224 lite5200_pm_target_state = PM_SUSPEND_ON; 225 } 226 227 static struct platform_suspend_ops lite5200_pm_ops = { 228 .valid = lite5200_pm_valid, 229 .begin = lite5200_pm_begin, 230 .prepare = lite5200_pm_prepare, 231 .enter = lite5200_pm_enter, 232 .finish = lite5200_pm_finish, 233 .end = lite5200_pm_end, 234 }; 235 236 int __init lite5200_pm_init(void) 237 { 238 suspend_set_ops(&lite5200_pm_ops); 239 return 0; 240 } 241