Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi...
[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
7 /* defined in lite5200_sleep.S and only used here */
8 extern void lite5200_low_power(void __iomem *sram, void __iomem *mbar);
9
10 static struct mpc52xx_cdm __iomem *cdm;
11 static struct mpc52xx_intr __iomem *pic;
12 static struct mpc52xx_sdma __iomem *bes;
13 static struct mpc52xx_xlb __iomem *xlb;
14 static struct mpc52xx_gpio __iomem *gps;
15 static struct mpc52xx_gpio_wkup __iomem *gpw;
16 static void __iomem *pci;
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         u64 regaddr64 = 0;
54         const u32 *regaddr_p;
55
56         /* deep sleep? let mpc52xx code handle that */
57         if (lite5200_pm_target_state == PM_SUSPEND_STANDBY)
58                 return mpc52xx_pm_prepare();
59
60         if (lite5200_pm_target_state != PM_SUSPEND_MEM)
61                 return -EINVAL;
62
63         /* map registers */
64         np = of_find_matching_node(NULL, immr_ids);
65         regaddr_p = of_get_address(np, 0, NULL, NULL);
66         if (regaddr_p)
67                 regaddr64 = of_translate_address(np, regaddr_p);
68         of_node_put(np);
69
70         mbar = ioremap((u32) regaddr64, 0xC000);
71         if (!mbar) {
72                 printk(KERN_ERR "%s:%i Error mapping registers\n", __func__, __LINE__);
73                 return -ENOSYS;
74         }
75
76         cdm = mbar + 0x200;
77         pic = mbar + 0x500;
78         gps = mbar + 0xb00;
79         gpw = mbar + 0xc00;
80         pci = mbar + 0xd00;
81         bes = mbar + 0x1200;
82         xlb = mbar + 0x1f00;
83         sram = mbar + 0x8000;
84
85         return 0;
86 }
87
88 /* save and restore registers not bound to any real devices */
89 static struct mpc52xx_cdm scdm;
90 static struct mpc52xx_intr spic;
91 static struct mpc52xx_sdma sbes;
92 static struct mpc52xx_xlb sxlb;
93 static struct mpc52xx_gpio sgps;
94 static struct mpc52xx_gpio_wkup sgpw;
95 static char spci[0x200];
96
97 static void lite5200_save_regs(void)
98 {
99         _memcpy_fromio(&spic, pic, sizeof(*pic));
100         _memcpy_fromio(&sbes, bes, sizeof(*bes));
101         _memcpy_fromio(&scdm, cdm, sizeof(*cdm));
102         _memcpy_fromio(&sxlb, xlb, sizeof(*xlb));
103         _memcpy_fromio(&sgps, gps, sizeof(*gps));
104         _memcpy_fromio(&sgpw, gpw, sizeof(*gpw));
105         _memcpy_fromio(spci, pci, 0x200);
106
107         _memcpy_fromio(saved_sram, sram, sram_size);
108 }
109
110 static void lite5200_restore_regs(void)
111 {
112         int i;
113         _memcpy_toio(sram, saved_sram, sram_size);
114
115         /* PCI Configuration */
116         _memcpy_toio(pci, spci, 0x200);
117
118         /*
119          * GPIOs. Interrupt Master Enable has higher address then other
120          * registers, so just memcpy is ok.
121          */
122         _memcpy_toio(gpw, &sgpw, sizeof(*gpw));
123         _memcpy_toio(gps, &sgps, sizeof(*gps));
124
125
126         /* XLB Arbitrer */
127         out_be32(&xlb->snoop_window, sxlb.snoop_window);
128         out_be32(&xlb->master_priority, sxlb.master_priority);
129         out_be32(&xlb->master_pri_enable, sxlb.master_pri_enable);
130
131         /* enable */
132         out_be32(&xlb->int_enable, sxlb.int_enable);
133         out_be32(&xlb->config, sxlb.config);
134
135
136         /* CDM - Clock Distribution Module */
137         out_8(&cdm->ipb_clk_sel, scdm.ipb_clk_sel);
138         out_8(&cdm->pci_clk_sel, scdm.pci_clk_sel);
139
140         out_8(&cdm->ext_48mhz_en, scdm.ext_48mhz_en);
141         out_8(&cdm->fd_enable, scdm.fd_enable);
142         out_be16(&cdm->fd_counters, scdm.fd_counters);
143
144         out_be32(&cdm->clk_enables, scdm.clk_enables);
145
146         out_8(&cdm->osc_disable, scdm.osc_disable);
147
148         out_be16(&cdm->mclken_div_psc1, scdm.mclken_div_psc1);
149         out_be16(&cdm->mclken_div_psc2, scdm.mclken_div_psc2);
150         out_be16(&cdm->mclken_div_psc3, scdm.mclken_div_psc3);
151         out_be16(&cdm->mclken_div_psc6, scdm.mclken_div_psc6);
152
153
154         /* BESTCOMM */
155         out_be32(&bes->taskBar, sbes.taskBar);
156         out_be32(&bes->currentPointer, sbes.currentPointer);
157         out_be32(&bes->endPointer, sbes.endPointer);
158         out_be32(&bes->variablePointer, sbes.variablePointer);
159
160         out_8(&bes->IntVect1, sbes.IntVect1);
161         out_8(&bes->IntVect2, sbes.IntVect2);
162         out_be16(&bes->PtdCntrl, sbes.PtdCntrl);
163
164         for (i=0; i<32; i++)
165                 out_8(&bes->ipr[i], sbes.ipr[i]);
166
167         out_be32(&bes->cReqSelect, sbes.cReqSelect);
168         out_be32(&bes->task_size0, sbes.task_size0);
169         out_be32(&bes->task_size1, sbes.task_size1);
170         out_be32(&bes->MDEDebug, sbes.MDEDebug);
171         out_be32(&bes->ADSDebug, sbes.ADSDebug);
172         out_be32(&bes->Value1, sbes.Value1);
173         out_be32(&bes->Value2, sbes.Value2);
174         out_be32(&bes->Control, sbes.Control);
175         out_be32(&bes->Status, sbes.Status);
176         out_be32(&bes->PTDDebug, sbes.PTDDebug);
177
178         /* restore tasks */
179         for (i=0; i<16; i++)
180                 out_be16(&bes->tcr[i], sbes.tcr[i]);
181
182         /* enable interrupts */
183         out_be32(&bes->IntPend, sbes.IntPend);
184         out_be32(&bes->IntMask, sbes.IntMask);
185
186
187         /* PIC */
188         out_be32(&pic->per_pri1, spic.per_pri1);
189         out_be32(&pic->per_pri2, spic.per_pri2);
190         out_be32(&pic->per_pri3, spic.per_pri3);
191
192         out_be32(&pic->main_pri1, spic.main_pri1);
193         out_be32(&pic->main_pri2, spic.main_pri2);
194
195         out_be32(&pic->enc_status, spic.enc_status);
196
197         /* unmask and enable interrupts */
198         out_be32(&pic->per_mask, spic.per_mask);
199         out_be32(&pic->main_mask, spic.main_mask);
200         out_be32(&pic->ctrl, spic.ctrl);
201 }
202
203 static int lite5200_pm_enter(suspend_state_t state)
204 {
205         /* deep sleep? let mpc52xx code handle that */
206         if (state == PM_SUSPEND_STANDBY) {
207                 return mpc52xx_pm_enter(state);
208         }
209
210         lite5200_save_regs();
211
212         /* effectively save FP regs */
213         enable_kernel_fp();
214
215         lite5200_low_power(sram, mbar);
216
217         lite5200_restore_regs();
218
219         /* restart jiffies */
220         wakeup_decrementer();
221
222         iounmap(mbar);
223         return 0;
224 }
225
226 static void lite5200_pm_finish(void)
227 {
228         /* deep sleep? let mpc52xx code handle that */
229         if (lite5200_pm_target_state == PM_SUSPEND_STANDBY)
230                 mpc52xx_pm_finish();
231 }
232
233 static void lite5200_pm_end(void)
234 {
235         lite5200_pm_target_state = PM_SUSPEND_ON;
236 }
237
238 static struct platform_suspend_ops lite5200_pm_ops = {
239         .valid          = lite5200_pm_valid,
240         .begin          = lite5200_pm_begin,
241         .prepare        = lite5200_pm_prepare,
242         .enter          = lite5200_pm_enter,
243         .finish         = lite5200_pm_finish,
244         .end            = lite5200_pm_end,
245 };
246
247 int __init lite5200_pm_init(void)
248 {
249         suspend_set_ops(&lite5200_pm_ops);
250         return 0;
251 }