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_set_target(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         /* deep sleep? let mpc52xx code handle that */
  46         if (lite5200_pm_target_state == PM_SUSPEND_STANDBY)
  47                 return mpc52xx_pm_prepare();
  48
  49         if (lite5200_pm_target_state != PM_SUSPEND_MEM)
  50                 return -EINVAL;
  51
  52         /* map registers */
  53         mbar = mpc52xx_find_and_map("mpc5200");
  54         if (!mbar) {
  55                 printk(KERN_ERR "%s:%i Error mapping registers\n", __func__, __LINE__);
  56                 return -ENOSYS;
  57         }
  58
  59         cdm = mbar + 0x200;
  60         pic = mbar + 0x500;
  61         gps = mbar + 0xb00;
  62         gpw = mbar + 0xc00;
  63         bes = mbar + 0x1200;
  64         xlb = mbar + 0x1f00;
  65         sram = mbar + 0x8000;
  66
  67         return 0;
  68 }
  69
  70 /* save and restore registers not bound to any real devices */
  71 static struct mpc52xx_cdm scdm;
  72 static struct mpc52xx_intr spic;
  73 static struct mpc52xx_sdma sbes;
  74 static struct mpc52xx_xlb sxlb;
  75 static struct mpc52xx_gpio sgps;
  76 static struct mpc52xx_gpio_wkup sgpw;
  77
  78 static void lite5200_save_regs(void)
  79 {
  80         _memcpy_fromio(&spic, pic, sizeof(*pic));
  81         _memcpy_fromio(&sbes, bes, sizeof(*bes));
  82         _memcpy_fromio(&scdm, cdm, sizeof(*cdm));
  83         _memcpy_fromio(&sxlb, xlb, sizeof(*xlb));
  84         _memcpy_fromio(&sgps, gps, sizeof(*gps));
  85         _memcpy_fromio(&sgpw, gpw, sizeof(*gpw));
  86
  87         _memcpy_fromio(saved_sram, sram, sram_size);
  88 }
  89
  90 static void lite5200_restore_regs(void)
  91 {
  92         int i;
  93         _memcpy_toio(sram, saved_sram, sram_size);
  94
  95
  96         /*
  97          * GPIOs. Interrupt Master Enable has higher address then other
  98          * registers, so just memcpy is ok.
  99          */
 100         _memcpy_toio(gpw, &sgpw, sizeof(*gpw));
 101         _memcpy_toio(gps, &sgps, sizeof(*gps));
 102
 103
 104         /* XLB Arbitrer */
 105         out_be32(&xlb->snoop_window, sxlb.snoop_window);
 106         out_be32(&xlb->master_priority, sxlb.master_priority);
 107         out_be32(&xlb->master_pri_enable, sxlb.master_pri_enable);
 108
 109         /* enable */
 110         out_be32(&xlb->int_enable, sxlb.int_enable);
 111         out_be32(&xlb->config, sxlb.config);
 112
 113
 114         /* CDM - Clock Distribution Module */
 115         out_8(&cdm->ipb_clk_sel, scdm.ipb_clk_sel);
 116         out_8(&cdm->pci_clk_sel, scdm.pci_clk_sel);
 117
 118         out_8(&cdm->ext_48mhz_en, scdm.ext_48mhz_en);
 119         out_8(&cdm->fd_enable, scdm.fd_enable);
 120         out_be16(&cdm->fd_counters, scdm.fd_counters);
 121
 122         out_be32(&cdm->clk_enables, scdm.clk_enables);
 123
 124         out_8(&cdm->osc_disable, scdm.osc_disable);
 125
 126         out_be16(&cdm->mclken_div_psc1, scdm.mclken_div_psc1);
 127         out_be16(&cdm->mclken_div_psc2, scdm.mclken_div_psc2);
 128         out_be16(&cdm->mclken_div_psc3, scdm.mclken_div_psc3);
 129         out_be16(&cdm->mclken_div_psc6, scdm.mclken_div_psc6);
 130
 131
 132         /* BESTCOMM */
 133         out_be32(&bes->taskBar, sbes.taskBar);
 134         out_be32(&bes->currentPointer, sbes.currentPointer);
 135         out_be32(&bes->endPointer, sbes.endPointer);
 136         out_be32(&bes->variablePointer, sbes.variablePointer);
 137
 138         out_8(&bes->IntVect1, sbes.IntVect1);
 139         out_8(&bes->IntVect2, sbes.IntVect2);
 140         out_be16(&bes->PtdCntrl, sbes.PtdCntrl);
 141
 142         for (i=0; i<32; i++)
 143                 out_8(&bes->ipr[i], sbes.ipr[i]);
 144
 145         out_be32(&bes->cReqSelect, sbes.cReqSelect);
 146         out_be32(&bes->task_size0, sbes.task_size0);
 147         out_be32(&bes->task_size1, sbes.task_size1);
 148         out_be32(&bes->MDEDebug, sbes.MDEDebug);
 149         out_be32(&bes->ADSDebug, sbes.ADSDebug);
 150         out_be32(&bes->Value1, sbes.Value1);
 151         out_be32(&bes->Value2, sbes.Value2);
 152         out_be32(&bes->Control, sbes.Control);
 153         out_be32(&bes->Status, sbes.Status);
 154         out_be32(&bes->PTDDebug, sbes.PTDDebug);
 155
 156         /* restore tasks */
 157         for (i=0; i<16; i++)
 158                 out_be16(&bes->tcr[i], sbes.tcr[i]);
 159
 160         /* enable interrupts */
 161         out_be32(&bes->IntPend, sbes.IntPend);
 162         out_be32(&bes->IntMask, sbes.IntMask);
 163
 164
 165         /* PIC */
 166         out_be32(&pic->per_pri1, spic.per_pri1);
 167         out_be32(&pic->per_pri2, spic.per_pri2);
 168         out_be32(&pic->per_pri3, spic.per_pri3);
 169
 170         out_be32(&pic->main_pri1, spic.main_pri1);
 171         out_be32(&pic->main_pri2, spic.main_pri2);
 172
 173         out_be32(&pic->enc_status, spic.enc_status);
 174
 175         /* unmask and enable interrupts */
 176         out_be32(&pic->per_mask, spic.per_mask);
 177         out_be32(&pic->main_mask, spic.main_mask);
 178         out_be32(&pic->ctrl, spic.ctrl);
 179 }
 180
 181 static int lite5200_pm_enter(suspend_state_t state)
 182 {
 183         /* deep sleep? let mpc52xx code handle that */
 184         if (state == PM_SUSPEND_STANDBY) {
 185                 return mpc52xx_pm_enter(state);
 186         }
 187
 188         lite5200_save_regs();
 189
 190         /* effectively save FP regs */
 191         enable_kernel_fp();
 192
 193         lite5200_low_power(sram, mbar);
 194
 195         lite5200_restore_regs();
 196
 197         /* restart jiffies */
 198         wakeup_decrementer();
 199
 200         iounmap(mbar);
 201         return 0;
 202 }
 203
 204 static void lite5200_pm_finish(void)
 205 {
 206         /* deep sleep? let mpc52xx code handle that */
 207         if (lite5200_pm_target_state == PM_SUSPEND_STANDBY)
 208                 mpc52xx_pm_finish();
 209 }
 210
 211 static struct platform_suspend_ops lite5200_pm_ops = {
 212         .valid          = lite5200_pm_valid,
 213         .set_target     = lite5200_pm_set_target,
 214         .prepare        = lite5200_pm_prepare,
 215         .enter          = lite5200_pm_enter,
 216         .finish         = lite5200_pm_finish,
 217 };
 218
 219 int __init lite5200_pm_init(void)
 220 {
 221         suspend_set_ops(&lite5200_pm_ops);
 222         return 0;
 223 }