1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/init.h> 3 #include <linux/suspend.h> 4 #include <linux/of_address.h> 5 6 #include <asm/io.h> 7 #include <asm/time.h> 8 #include <asm/mpc52xx.h> 9 #include <asm/switch_to.h> 10 11 /* defined in lite5200_sleep.S and only used here */ 12 extern void lite5200_low_power(void __iomem *sram, void __iomem *mbar); 13 14 static struct mpc52xx_cdm __iomem *cdm; 15 static struct mpc52xx_intr __iomem *pic; 16 static struct mpc52xx_sdma __iomem *bes; 17 static struct mpc52xx_xlb __iomem *xlb; 18 static struct mpc52xx_gpio __iomem *gps; 19 static struct mpc52xx_gpio_wkup __iomem *gpw; 20 static void __iomem *pci; 21 static void __iomem *sram; 22 static const int sram_size = 0x4000; /* 16 kBytes */ 23 static void __iomem *mbar; 24 25 static suspend_state_t lite5200_pm_target_state; 26 27 static int lite5200_pm_valid(suspend_state_t state) 28 { 29 switch (state) { 30 case PM_SUSPEND_STANDBY: 31 case PM_SUSPEND_MEM: 32 return 1; 33 default: 34 return 0; 35 } 36 } 37 38 static int lite5200_pm_begin(suspend_state_t state) 39 { 40 if (lite5200_pm_valid(state)) { 41 lite5200_pm_target_state = state; 42 return 0; 43 } 44 return -EINVAL; 45 } 46 47 static int lite5200_pm_prepare(void) 48 { 49 struct device_node *np; 50 const struct of_device_id immr_ids[] = { 51 { .compatible = "fsl,mpc5200-immr", }, 52 { .compatible = "fsl,mpc5200b-immr", }, 53 { .type = "soc", .compatible = "mpc5200", }, /* lite5200 */ 54 { .type = "builtin", .compatible = "mpc5200", }, /* efika */ 55 {} 56 }; 57 u64 regaddr64 = 0; 58 const u32 *regaddr_p; 59 60 /* deep sleep? let mpc52xx code handle that */ 61 if (lite5200_pm_target_state == PM_SUSPEND_STANDBY) 62 return mpc52xx_pm_prepare(); 63 64 if (lite5200_pm_target_state != PM_SUSPEND_MEM) 65 return -EINVAL; 66 67 /* map registers */ 68 np = of_find_matching_node(NULL, immr_ids); 69 regaddr_p = of_get_address(np, 0, NULL, NULL); 70 if (regaddr_p) 71 regaddr64 = of_translate_address(np, regaddr_p); 72 of_node_put(np); 73 74 mbar = ioremap((u32) regaddr64, 0xC000); 75 if (!mbar) { 76 printk(KERN_ERR "%s:%i Error mapping registers\n", __func__, __LINE__); 77 return -ENOSYS; 78 } 79 80 cdm = mbar + 0x200; 81 pic = mbar + 0x500; 82 gps = mbar + 0xb00; 83 gpw = mbar + 0xc00; 84 pci = mbar + 0xd00; 85 bes = mbar + 0x1200; 86 xlb = mbar + 0x1f00; 87 sram = mbar + 0x8000; 88 89 return 0; 90 } 91 92 /* save and restore registers not bound to any real devices */ 93 static struct mpc52xx_cdm scdm; 94 static struct mpc52xx_intr spic; 95 static struct mpc52xx_sdma sbes; 96 static struct mpc52xx_xlb sxlb; 97 static struct mpc52xx_gpio sgps; 98 static struct mpc52xx_gpio_wkup sgpw; 99 static char spci[0x200]; 100 101 static void lite5200_save_regs(void) 102 { 103 _memcpy_fromio(&spic, pic, sizeof(*pic)); 104 _memcpy_fromio(&sbes, bes, sizeof(*bes)); 105 _memcpy_fromio(&scdm, cdm, sizeof(*cdm)); 106 _memcpy_fromio(&sxlb, xlb, sizeof(*xlb)); 107 _memcpy_fromio(&sgps, gps, sizeof(*gps)); 108 _memcpy_fromio(&sgpw, gpw, sizeof(*gpw)); 109 _memcpy_fromio(spci, pci, 0x200); 110 111 _memcpy_fromio(saved_sram, sram, sram_size); 112 } 113 114 static void lite5200_restore_regs(void) 115 { 116 int i; 117 _memcpy_toio(sram, saved_sram, sram_size); 118 119 /* PCI Configuration */ 120 _memcpy_toio(pci, spci, 0x200); 121 122 /* 123 * GPIOs. Interrupt Master Enable has higher address then other 124 * registers, so just memcpy is ok. 125 */ 126 _memcpy_toio(gpw, &sgpw, sizeof(*gpw)); 127 _memcpy_toio(gps, &sgps, sizeof(*gps)); 128 129 130 /* XLB Arbitrer */ 131 out_be32(&xlb->snoop_window, sxlb.snoop_window); 132 out_be32(&xlb->master_priority, sxlb.master_priority); 133 out_be32(&xlb->master_pri_enable, sxlb.master_pri_enable); 134 135 /* enable */ 136 out_be32(&xlb->int_enable, sxlb.int_enable); 137 out_be32(&xlb->config, sxlb.config); 138 139 140 /* CDM - Clock Distribution Module */ 141 out_8(&cdm->ipb_clk_sel, scdm.ipb_clk_sel); 142 out_8(&cdm->pci_clk_sel, scdm.pci_clk_sel); 143 144 out_8(&cdm->ext_48mhz_en, scdm.ext_48mhz_en); 145 out_8(&cdm->fd_enable, scdm.fd_enable); 146 out_be16(&cdm->fd_counters, scdm.fd_counters); 147 148 out_be32(&cdm->clk_enables, scdm.clk_enables); 149 150 out_8(&cdm->osc_disable, scdm.osc_disable); 151 152 out_be16(&cdm->mclken_div_psc1, scdm.mclken_div_psc1); 153 out_be16(&cdm->mclken_div_psc2, scdm.mclken_div_psc2); 154 out_be16(&cdm->mclken_div_psc3, scdm.mclken_div_psc3); 155 out_be16(&cdm->mclken_div_psc6, scdm.mclken_div_psc6); 156 157 158 /* BESTCOMM */ 159 out_be32(&bes->taskBar, sbes.taskBar); 160 out_be32(&bes->currentPointer, sbes.currentPointer); 161 out_be32(&bes->endPointer, sbes.endPointer); 162 out_be32(&bes->variablePointer, sbes.variablePointer); 163 164 out_8(&bes->IntVect1, sbes.IntVect1); 165 out_8(&bes->IntVect2, sbes.IntVect2); 166 out_be16(&bes->PtdCntrl, sbes.PtdCntrl); 167 168 for (i=0; i<32; i++) 169 out_8(&bes->ipr[i], sbes.ipr[i]); 170 171 out_be32(&bes->cReqSelect, sbes.cReqSelect); 172 out_be32(&bes->task_size0, sbes.task_size0); 173 out_be32(&bes->task_size1, sbes.task_size1); 174 out_be32(&bes->MDEDebug, sbes.MDEDebug); 175 out_be32(&bes->ADSDebug, sbes.ADSDebug); 176 out_be32(&bes->Value1, sbes.Value1); 177 out_be32(&bes->Value2, sbes.Value2); 178 out_be32(&bes->Control, sbes.Control); 179 out_be32(&bes->Status, sbes.Status); 180 out_be32(&bes->PTDDebug, sbes.PTDDebug); 181 182 /* restore tasks */ 183 for (i=0; i<16; i++) 184 out_be16(&bes->tcr[i], sbes.tcr[i]); 185 186 /* enable interrupts */ 187 out_be32(&bes->IntPend, sbes.IntPend); 188 out_be32(&bes->IntMask, sbes.IntMask); 189 190 191 /* PIC */ 192 out_be32(&pic->per_pri1, spic.per_pri1); 193 out_be32(&pic->per_pri2, spic.per_pri2); 194 out_be32(&pic->per_pri3, spic.per_pri3); 195 196 out_be32(&pic->main_pri1, spic.main_pri1); 197 out_be32(&pic->main_pri2, spic.main_pri2); 198 199 out_be32(&pic->enc_status, spic.enc_status); 200 201 /* unmask and enable interrupts */ 202 out_be32(&pic->per_mask, spic.per_mask); 203 out_be32(&pic->main_mask, spic.main_mask); 204 out_be32(&pic->ctrl, spic.ctrl); 205 } 206 207 static int lite5200_pm_enter(suspend_state_t state) 208 { 209 /* deep sleep? let mpc52xx code handle that */ 210 if (state == PM_SUSPEND_STANDBY) { 211 return mpc52xx_pm_enter(state); 212 } 213 214 lite5200_save_regs(); 215 216 /* effectively save FP regs */ 217 enable_kernel_fp(); 218 219 lite5200_low_power(sram, mbar); 220 221 lite5200_restore_regs(); 222 223 iounmap(mbar); 224 return 0; 225 } 226 227 static void lite5200_pm_finish(void) 228 { 229 /* deep sleep? let mpc52xx code handle that */ 230 if (lite5200_pm_target_state == PM_SUSPEND_STANDBY) 231 mpc52xx_pm_finish(); 232 } 233 234 static void lite5200_pm_end(void) 235 { 236 lite5200_pm_target_state = PM_SUSPEND_ON; 237 } 238 239 static const struct platform_suspend_ops lite5200_pm_ops = { 240 .valid = lite5200_pm_valid, 241 .begin = lite5200_pm_begin, 242 .prepare = lite5200_pm_prepare, 243 .enter = lite5200_pm_enter, 244 .finish = lite5200_pm_finish, 245 .end = lite5200_pm_end, 246 }; 247 248 int __init lite5200_pm_init(void) 249 { 250 suspend_set_ops(&lite5200_pm_ops); 251 return 0; 252 } 253