Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq
[linux-2.6] / 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 }