arch/powerpc/platforms/52xx/lite5200_pm.c

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