1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/init.h>
3 #include <linux/suspend.h>
4 #include <linux/io.h>
5 #include <linux/of_address.h>
6
7 #include <asm/time.h>
8 #include <asm/cacheflush.h>
9 #include <asm/mpc52xx.h>
10
11 /* these are defined in mpc52xx_sleep.S, and only used here */
12 extern void mpc52xx_deep_sleep(void __iomem *sram, void __iomem *sdram_regs,
13 struct mpc52xx_cdm __iomem *, struct mpc52xx_intr __iomem*);
14 extern void mpc52xx_ds_sram(void);
15 extern const long mpc52xx_ds_sram_size;
16 extern void mpc52xx_ds_cached(void);
17 extern const long mpc52xx_ds_cached_size;
18
19 static void __iomem *mbar;
20 static void __iomem *sdram;
21 static struct mpc52xx_cdm __iomem *cdm;
22 static struct mpc52xx_intr __iomem *intr;
23 static struct mpc52xx_gpio_wkup __iomem *gpiow;
24 static void __iomem *sram;
25 static int sram_size;
26
27 struct mpc52xx_suspend mpc52xx_suspend;
28
mpc52xx_pm_valid(suspend_state_t state)29 static int mpc52xx_pm_valid(suspend_state_t state)
30 {
31 switch (state) {
32 case PM_SUSPEND_STANDBY:
33 return 1;
34 default:
35 return 0;
36 }
37 }
38
mpc52xx_set_wakeup_gpio(u8 pin,u8 level)39 int mpc52xx_set_wakeup_gpio(u8 pin, u8 level)
40 {
41 u16 tmp;
42
43 /* enable gpio */
44 out_8(&gpiow->wkup_gpioe, in_8(&gpiow->wkup_gpioe) | (1 << pin));
45 /* set as input */
46 out_8(&gpiow->wkup_ddr, in_8(&gpiow->wkup_ddr) & ~(1 << pin));
47 /* enable deep sleep interrupt */
48 out_8(&gpiow->wkup_inten, in_8(&gpiow->wkup_inten) | (1 << pin));
49 /* low/high level creates wakeup interrupt */
50 tmp = in_be16(&gpiow->wkup_itype);
51 tmp &= ~(0x3 << (pin * 2));
52 tmp |= (!level + 1) << (pin * 2);
53 out_be16(&gpiow->wkup_itype, tmp);
54 /* master enable */
55 out_8(&gpiow->wkup_maste, 1);
56
57 return 0;
58 }
59
mpc52xx_pm_prepare(void)60 int mpc52xx_pm_prepare(void)
61 {
62 struct device_node *np;
63 const struct of_device_id immr_ids[] = {
64 { .compatible = "fsl,mpc5200-immr", },
65 { .compatible = "fsl,mpc5200b-immr", },
66 { .type = "soc", .compatible = "mpc5200", }, /* lite5200 */
67 { .type = "builtin", .compatible = "mpc5200", }, /* efika */
68 {}
69 };
70 struct resource res;
71
72 /* map the whole register space */
73 np = of_find_matching_node(NULL, immr_ids);
74
75 if (of_address_to_resource(np, 0, &res)) {
76 pr_err("mpc52xx_pm_prepare(): could not get IMMR address\n");
77 of_node_put(np);
78 return -ENOSYS;
79 }
80
81 mbar = ioremap(res.start, 0xc000); /* we should map whole region including SRAM */
82
83 of_node_put(np);
84 if (!mbar) {
85 pr_err("mpc52xx_pm_prepare(): could not map registers\n");
86 return -ENOSYS;
87 }
88 /* these offsets are from mpc5200 users manual */
89 sdram = mbar + 0x100;
90 cdm = mbar + 0x200;
91 intr = mbar + 0x500;
92 gpiow = mbar + 0xc00;
93 sram = mbar + 0x8000; /* Those will be handled by the */
94 sram_size = 0x4000; /* bestcomm driver soon */
95
96 /* call board suspend code, if applicable */
97 if (mpc52xx_suspend.board_suspend_prepare)
98 mpc52xx_suspend.board_suspend_prepare(mbar);
99 else {
100 printk(KERN_ALERT "%s: %i don't know how to wake up the board\n",
101 __func__, __LINE__);
102 goto out_unmap;
103 }
104
105 return 0;
106
107 out_unmap:
108 iounmap(mbar);
109 return -ENOSYS;
110 }
111
112
113 char saved_sram[0x4000];
114
mpc52xx_pm_enter(suspend_state_t state)115 int mpc52xx_pm_enter(suspend_state_t state)
116 {
117 u32 clk_enables;
118 u32 msr, hid0;
119 u32 intr_main_mask;
120 void __iomem * irq_0x500 = (void __iomem *)CONFIG_KERNEL_START + 0x500;
121 unsigned long irq_0x500_stop = (unsigned long)irq_0x500 + mpc52xx_ds_cached_size;
122 char saved_0x500[0x600-0x500];
123
124 if (WARN_ON(mpc52xx_ds_cached_size > sizeof(saved_0x500)))
125 return -ENOMEM;
126
127 /* disable all interrupts in PIC */
128 intr_main_mask = in_be32(&intr->main_mask);
129 out_be32(&intr->main_mask, intr_main_mask | 0x1ffff);
130
131 /* don't let DEC expire any time soon */
132 mtspr(SPRN_DEC, 0x7fffffff);
133
134 /* save SRAM */
135 memcpy(saved_sram, sram, sram_size);
136
137 /* copy low level suspend code to sram */
138 memcpy(sram, mpc52xx_ds_sram, mpc52xx_ds_sram_size);
139
140 out_8(&cdm->ccs_sleep_enable, 1);
141 out_8(&cdm->osc_sleep_enable, 1);
142 out_8(&cdm->ccs_qreq_test, 1);
143
144 /* disable all but SDRAM and bestcomm (SRAM) clocks */
145 clk_enables = in_be32(&cdm->clk_enables);
146 out_be32(&cdm->clk_enables, clk_enables & 0x00088000);
147
148 /* disable power management */
149 msr = mfmsr();
150 mtmsr(msr & ~MSR_POW);
151
152 /* enable sleep mode, disable others */
153 hid0 = mfspr(SPRN_HID0);
154 mtspr(SPRN_HID0, (hid0 & ~(HID0_DOZE | HID0_NAP | HID0_DPM)) | HID0_SLEEP);
155
156 /* save original, copy our irq handler, flush from dcache and invalidate icache */
157 memcpy(saved_0x500, irq_0x500, mpc52xx_ds_cached_size);
158 memcpy(irq_0x500, mpc52xx_ds_cached, mpc52xx_ds_cached_size);
159 flush_icache_range((unsigned long)irq_0x500, irq_0x500_stop);
160
161 /* call low-level sleep code */
162 mpc52xx_deep_sleep(sram, sdram, cdm, intr);
163
164 /* restore original irq handler */
165 memcpy(irq_0x500, saved_0x500, mpc52xx_ds_cached_size);
166 flush_icache_range((unsigned long)irq_0x500, irq_0x500_stop);
167
168 /* restore old power mode */
169 mtmsr(msr & ~MSR_POW);
170 mtspr(SPRN_HID0, hid0);
171 mtmsr(msr);
172
173 out_be32(&cdm->clk_enables, clk_enables);
174 out_8(&cdm->ccs_sleep_enable, 0);
175 out_8(&cdm->osc_sleep_enable, 0);
176
177 /* restore SRAM */
178 memcpy(sram, saved_sram, sram_size);
179
180 /* reenable interrupts in PIC */
181 out_be32(&intr->main_mask, intr_main_mask);
182
183 return 0;
184 }
185
mpc52xx_pm_finish(void)186 void mpc52xx_pm_finish(void)
187 {
188 /* call board resume code */
189 if (mpc52xx_suspend.board_resume_finish)
190 mpc52xx_suspend.board_resume_finish(mbar);
191
192 iounmap(mbar);
193 }
194
195 static const struct platform_suspend_ops mpc52xx_pm_ops = {
196 .valid = mpc52xx_pm_valid,
197 .prepare = mpc52xx_pm_prepare,
198 .enter = mpc52xx_pm_enter,
199 .finish = mpc52xx_pm_finish,
200 };
201
mpc52xx_pm_init(void)202 int __init mpc52xx_pm_init(void)
203 {
204 suspend_set_ops(&mpc52xx_pm_ops);
205 return 0;
206 }
207