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