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 "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 }