1 #include <linux/init.h>
2 #include <linux/suspend.h>
5 #include <asm/cacheflush.h>
6 #include <asm/mpc52xx.h>
8 #include "mpc52xx_pic.h"
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;
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;
27 struct mpc52xx_suspend mpc52xx_suspend;
29 static int mpc52xx_pm_valid(suspend_state_t state)
32 case PM_SUSPEND_STANDBY:
39 int mpc52xx_set_wakeup_gpio(u8 pin, u8 level)
44 out_8(&gpiow->wkup_gpioe, in_8(&gpiow->wkup_gpioe) | (1 << pin));
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);
55 out_8(&gpiow->wkup_maste, 1);
60 int mpc52xx_pm_prepare(void)
62 struct device_node *np;
64 /* map the whole register space */
65 np = of_find_compatible_node(NULL, NULL, "mpc5200");
66 mbar = of_iomap(np, 0);
69 pr_err("mpc52xx_pm_prepare(): could not map registers\n");
72 /* these offsets are from mpc5200 users manual */
77 sram = mbar + 0x8000; /* Those will be handled by the */
78 sram_size = 0x4000; /* bestcomm driver soon */
80 /* call board suspend code, if applicable */
81 if (mpc52xx_suspend.board_suspend_prepare)
82 mpc52xx_suspend.board_suspend_prepare(mbar);
84 printk(KERN_ALERT "%s: %i don't know how to wake up the board\n",
97 char saved_sram[0x4000];
99 int mpc52xx_pm_enter(suspend_state_t state)
104 void __iomem * irq_0x500 = (void __iomem *)CONFIG_KERNEL_START + 0x500;
105 unsigned long irq_0x500_stop = (unsigned long)irq_0x500 + mpc52xx_ds_cached_size;
106 char saved_0x500[mpc52xx_ds_cached_size];
108 /* disable all interrupts in PIC */
109 intr_main_mask = in_be32(&intr->main_mask);
110 out_be32(&intr->main_mask, intr_main_mask | 0x1ffff);
112 /* don't let DEC expire any time soon */
113 mtspr(SPRN_DEC, 0x7fffffff);
116 memcpy(saved_sram, sram, sram_size);
118 /* copy low level suspend code to sram */
119 memcpy(sram, mpc52xx_ds_sram, mpc52xx_ds_sram_size);
121 out_8(&cdm->ccs_sleep_enable, 1);
122 out_8(&cdm->osc_sleep_enable, 1);
123 out_8(&cdm->ccs_qreq_test, 1);
125 /* disable all but SDRAM and bestcomm (SRAM) clocks */
126 clk_enables = in_be32(&cdm->clk_enables);
127 out_be32(&cdm->clk_enables, clk_enables & 0x00088000);
129 /* disable power management */
131 mtmsr(msr & ~MSR_POW);
133 /* enable sleep mode, disable others */
134 hid0 = mfspr(SPRN_HID0);
135 mtspr(SPRN_HID0, (hid0 & ~(HID0_DOZE | HID0_NAP | HID0_DPM)) | HID0_SLEEP);
137 /* save original, copy our irq handler, flush from dcache and invalidate icache */
138 memcpy(saved_0x500, irq_0x500, mpc52xx_ds_cached_size);
139 memcpy(irq_0x500, mpc52xx_ds_cached, mpc52xx_ds_cached_size);
140 flush_icache_range((unsigned long)irq_0x500, irq_0x500_stop);
142 /* call low-level sleep code */
143 mpc52xx_deep_sleep(sram, sdram, cdm, intr);
145 /* restore original irq handler */
146 memcpy(irq_0x500, saved_0x500, mpc52xx_ds_cached_size);
147 flush_icache_range((unsigned long)irq_0x500, irq_0x500_stop);
149 /* restore old power mode */
150 mtmsr(msr & ~MSR_POW);
151 mtspr(SPRN_HID0, hid0);
154 out_be32(&cdm->clk_enables, clk_enables);
155 out_8(&cdm->ccs_sleep_enable, 0);
156 out_8(&cdm->osc_sleep_enable, 0);
159 memcpy(sram, saved_sram, sram_size);
161 /* restart jiffies */
162 wakeup_decrementer();
164 /* reenable interrupts in PIC */
165 out_be32(&intr->main_mask, intr_main_mask);
170 void mpc52xx_pm_finish(void)
172 /* call board resume code */
173 if (mpc52xx_suspend.board_resume_finish)
174 mpc52xx_suspend.board_resume_finish(mbar);
179 static struct platform_suspend_ops mpc52xx_pm_ops = {
180 .valid = mpc52xx_pm_valid,
181 .prepare = mpc52xx_pm_prepare,
182 .enter = mpc52xx_pm_enter,
183 .finish = mpc52xx_pm_finish,
186 int __init mpc52xx_pm_init(void)
188 suspend_set_ops(&mpc52xx_pm_ops);