1 #include <linux/init.h>
2 #include <linux/suspend.h>
5 #include <asm/mpc52xx.h>
6 #include "mpc52xx_pic.h"
8 /* defined in lite5200_sleep.S and only used here */
9 extern void lite5200_low_power(void __iomem *sram, void __iomem *mbar);
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;
21 static suspend_state_t lite5200_pm_target_state;
23 static int lite5200_pm_valid(suspend_state_t state)
26 case PM_SUSPEND_STANDBY:
34 static int lite5200_pm_set_target(suspend_state_t state)
36 if (lite5200_pm_valid(state)) {
37 lite5200_pm_target_state = state;
43 static int lite5200_pm_prepare(void)
45 struct device_node *np;
47 /* deep sleep? let mpc52xx code handle that */
48 if (lite5200_pm_target_state == PM_SUSPEND_STANDBY)
49 return mpc52xx_pm_prepare();
51 if (lite5200_pm_target_state != PM_SUSPEND_MEM)
55 np = of_find_compatible_node(NULL, NULL, "mpc5200");
56 mbar = of_iomap(np, 0);
59 printk(KERN_ERR "%s:%i Error mapping registers\n", __func__, __LINE__);
74 /* save and restore registers not bound to any real devices */
75 static struct mpc52xx_cdm scdm;
76 static struct mpc52xx_intr spic;
77 static struct mpc52xx_sdma sbes;
78 static struct mpc52xx_xlb sxlb;
79 static struct mpc52xx_gpio sgps;
80 static struct mpc52xx_gpio_wkup sgpw;
82 static void lite5200_save_regs(void)
84 _memcpy_fromio(&spic, pic, sizeof(*pic));
85 _memcpy_fromio(&sbes, bes, sizeof(*bes));
86 _memcpy_fromio(&scdm, cdm, sizeof(*cdm));
87 _memcpy_fromio(&sxlb, xlb, sizeof(*xlb));
88 _memcpy_fromio(&sgps, gps, sizeof(*gps));
89 _memcpy_fromio(&sgpw, gpw, sizeof(*gpw));
91 _memcpy_fromio(saved_sram, sram, sram_size);
94 static void lite5200_restore_regs(void)
97 _memcpy_toio(sram, saved_sram, sram_size);
101 * GPIOs. Interrupt Master Enable has higher address then other
102 * registers, so just memcpy is ok.
104 _memcpy_toio(gpw, &sgpw, sizeof(*gpw));
105 _memcpy_toio(gps, &sgps, sizeof(*gps));
109 out_be32(&xlb->snoop_window, sxlb.snoop_window);
110 out_be32(&xlb->master_priority, sxlb.master_priority);
111 out_be32(&xlb->master_pri_enable, sxlb.master_pri_enable);
114 out_be32(&xlb->int_enable, sxlb.int_enable);
115 out_be32(&xlb->config, sxlb.config);
118 /* CDM - Clock Distribution Module */
119 out_8(&cdm->ipb_clk_sel, scdm.ipb_clk_sel);
120 out_8(&cdm->pci_clk_sel, scdm.pci_clk_sel);
122 out_8(&cdm->ext_48mhz_en, scdm.ext_48mhz_en);
123 out_8(&cdm->fd_enable, scdm.fd_enable);
124 out_be16(&cdm->fd_counters, scdm.fd_counters);
126 out_be32(&cdm->clk_enables, scdm.clk_enables);
128 out_8(&cdm->osc_disable, scdm.osc_disable);
130 out_be16(&cdm->mclken_div_psc1, scdm.mclken_div_psc1);
131 out_be16(&cdm->mclken_div_psc2, scdm.mclken_div_psc2);
132 out_be16(&cdm->mclken_div_psc3, scdm.mclken_div_psc3);
133 out_be16(&cdm->mclken_div_psc6, scdm.mclken_div_psc6);
137 out_be32(&bes->taskBar, sbes.taskBar);
138 out_be32(&bes->currentPointer, sbes.currentPointer);
139 out_be32(&bes->endPointer, sbes.endPointer);
140 out_be32(&bes->variablePointer, sbes.variablePointer);
142 out_8(&bes->IntVect1, sbes.IntVect1);
143 out_8(&bes->IntVect2, sbes.IntVect2);
144 out_be16(&bes->PtdCntrl, sbes.PtdCntrl);
147 out_8(&bes->ipr[i], sbes.ipr[i]);
149 out_be32(&bes->cReqSelect, sbes.cReqSelect);
150 out_be32(&bes->task_size0, sbes.task_size0);
151 out_be32(&bes->task_size1, sbes.task_size1);
152 out_be32(&bes->MDEDebug, sbes.MDEDebug);
153 out_be32(&bes->ADSDebug, sbes.ADSDebug);
154 out_be32(&bes->Value1, sbes.Value1);
155 out_be32(&bes->Value2, sbes.Value2);
156 out_be32(&bes->Control, sbes.Control);
157 out_be32(&bes->Status, sbes.Status);
158 out_be32(&bes->PTDDebug, sbes.PTDDebug);
162 out_be16(&bes->tcr[i], sbes.tcr[i]);
164 /* enable interrupts */
165 out_be32(&bes->IntPend, sbes.IntPend);
166 out_be32(&bes->IntMask, sbes.IntMask);
170 out_be32(&pic->per_pri1, spic.per_pri1);
171 out_be32(&pic->per_pri2, spic.per_pri2);
172 out_be32(&pic->per_pri3, spic.per_pri3);
174 out_be32(&pic->main_pri1, spic.main_pri1);
175 out_be32(&pic->main_pri2, spic.main_pri2);
177 out_be32(&pic->enc_status, spic.enc_status);
179 /* unmask and enable interrupts */
180 out_be32(&pic->per_mask, spic.per_mask);
181 out_be32(&pic->main_mask, spic.main_mask);
182 out_be32(&pic->ctrl, spic.ctrl);
185 static int lite5200_pm_enter(suspend_state_t state)
187 /* deep sleep? let mpc52xx code handle that */
188 if (state == PM_SUSPEND_STANDBY) {
189 return mpc52xx_pm_enter(state);
192 lite5200_save_regs();
194 /* effectively save FP regs */
197 lite5200_low_power(sram, mbar);
199 lite5200_restore_regs();
201 /* restart jiffies */
202 wakeup_decrementer();
208 static void lite5200_pm_finish(void)
210 /* deep sleep? let mpc52xx code handle that */
211 if (lite5200_pm_target_state == PM_SUSPEND_STANDBY)
215 static struct platform_suspend_ops lite5200_pm_ops = {
216 .valid = lite5200_pm_valid,
217 .set_target = lite5200_pm_set_target,
218 .prepare = lite5200_pm_prepare,
219 .enter = lite5200_pm_enter,
220 .finish = lite5200_pm_finish,
223 int __init lite5200_pm_init(void)
225 suspend_set_ops(&lite5200_pm_ops);