Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6
[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 *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         /* restart jiffies */
221         wakeup_decrementer();
222
223         iounmap(mbar);
224         return 0;
225 }
226
227 static void lite5200_pm_finish(void)
228 {
229         /* deep sleep? let mpc52xx code handle that */
230         if (lite5200_pm_target_state == PM_SUSPEND_STANDBY)
231                 mpc52xx_pm_finish();
232 }
233
234 static void lite5200_pm_end(void)
235 {
236         lite5200_pm_target_state = PM_SUSPEND_ON;
237 }
238
239 static struct platform_suspend_ops lite5200_pm_ops = {
240         .valid          = lite5200_pm_valid,
241         .begin          = lite5200_pm_begin,
242         .prepare        = lite5200_pm_prepare,
243         .enter          = lite5200_pm_enter,
244         .finish         = lite5200_pm_finish,
245         .end            = lite5200_pm_end,
246 };
247
248 int __init lite5200_pm_init(void)
249 {
250         suspend_set_ops(&lite5200_pm_ops);
251         return 0;
252 }