blob: 07e23ba61f3ac3df52782455e850068128267bec [file] [log] [blame]
Sekhar Noriefc1bb82009-12-17 18:29:31 +05301/*
2 * DaVinci Power Management Routines
3 *
4 * Copyright (C) 2009 Texas Instruments, Inc. http://www.ti.com/
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#include <linux/pm.h>
12#include <linux/suspend.h>
13#include <linux/module.h>
14#include <linux/platform_device.h>
15#include <linux/clk.h>
16#include <linux/spinlock.h>
17
18#include <asm/cacheflush.h>
19#include <asm/delay.h>
Alexey Dobriyanb7f080c2011-06-16 11:01:34 +000020#include <asm/io.h>
Sekhar Noriefc1bb82009-12-17 18:29:31 +053021
Sekhar Nori215a0842013-04-10 14:57:15 +053022#include <mach/common.h>
Sekhar Noriefc1bb82009-12-17 18:29:31 +053023#include <mach/da8xx.h>
24#include <mach/sram.h>
25#include <mach/pm.h>
26
27#include "clock.h"
28
29#define DEEPSLEEP_SLEEPCOUNT_MASK 0xFFFF
30
31static void (*davinci_sram_suspend) (struct davinci_pm_config *);
32static struct davinci_pm_config *pdata;
33
34static void davinci_sram_push(void *dest, void *src, unsigned int size)
35{
36 memcpy(dest, src, size);
37 flush_icache_range((unsigned long)dest, (unsigned long)(dest + size));
38}
39
40static void davinci_pm_suspend(void)
41{
42 unsigned val;
43
44 if (pdata->cpupll_reg_base != pdata->ddrpll_reg_base) {
45
46 /* Switch CPU PLL to bypass mode */
47 val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
48 val &= ~(PLLCTL_PLLENSRC | PLLCTL_PLLEN);
49 __raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
50
51 udelay(PLL_BYPASS_TIME);
52
53 /* Powerdown CPU PLL */
54 val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
55 val |= PLLCTL_PLLPWRDN;
56 __raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
57 }
58
59 /* Configure sleep count in deep sleep register */
60 val = __raw_readl(pdata->deepsleep_reg);
61 val &= ~DEEPSLEEP_SLEEPCOUNT_MASK,
62 val |= pdata->sleepcount;
63 __raw_writel(val, pdata->deepsleep_reg);
64
65 /* System goes to sleep in this call */
66 davinci_sram_suspend(pdata);
67
68 if (pdata->cpupll_reg_base != pdata->ddrpll_reg_base) {
69
70 /* put CPU PLL in reset */
71 val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
72 val &= ~PLLCTL_PLLRST;
73 __raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
74
75 /* put CPU PLL in power down */
76 val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
77 val &= ~PLLCTL_PLLPWRDN;
78 __raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
79
80 /* wait for CPU PLL reset */
81 udelay(PLL_RESET_TIME);
82
83 /* bring CPU PLL out of reset */
84 val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
85 val |= PLLCTL_PLLRST;
86 __raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
87
88 /* Wait for CPU PLL to lock */
89 udelay(PLL_LOCK_TIME);
90
91 /* Remove CPU PLL from bypass mode */
92 val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
93 val &= ~PLLCTL_PLLENSRC;
94 val |= PLLCTL_PLLEN;
95 __raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
96 }
97}
98
99static int davinci_pm_enter(suspend_state_t state)
100{
101 int ret = 0;
102
103 switch (state) {
104 case PM_SUSPEND_STANDBY:
105 case PM_SUSPEND_MEM:
106 davinci_pm_suspend();
107 break;
108 default:
109 ret = -EINVAL;
110 }
111
112 return ret;
113}
114
Lionel Debroux2f55ac02010-11-16 14:14:02 +0100115static const struct platform_suspend_ops davinci_pm_ops = {
Sekhar Noriefc1bb82009-12-17 18:29:31 +0530116 .enter = davinci_pm_enter,
117 .valid = suspend_valid_only_mem,
118};
119
120static int __init davinci_pm_probe(struct platform_device *pdev)
121{
122 pdata = pdev->dev.platform_data;
123 if (!pdata) {
124 dev_err(&pdev->dev, "cannot get platform data\n");
125 return -ENOENT;
126 }
127
128 davinci_sram_suspend = sram_alloc(davinci_cpu_suspend_sz, NULL);
129 if (!davinci_sram_suspend) {
130 dev_err(&pdev->dev, "cannot allocate SRAM memory\n");
131 return -ENOMEM;
132 }
133
134 davinci_sram_push(davinci_sram_suspend, davinci_cpu_suspend,
135 davinci_cpu_suspend_sz);
136
137 suspend_set_ops(&davinci_pm_ops);
138
139 return 0;
140}
141
142static int __exit davinci_pm_remove(struct platform_device *pdev)
143{
144 sram_free(davinci_sram_suspend, davinci_cpu_suspend_sz);
145 return 0;
146}
147
148static struct platform_driver davinci_pm_driver = {
149 .driver = {
150 .name = "pm-davinci",
Sekhar Noriefc1bb82009-12-17 18:29:31 +0530151 },
152 .remove = __exit_p(davinci_pm_remove),
153};
154
Shawn Guo3aa3e842012-04-26 09:45:39 +0800155int __init davinci_pm_init(void)
Sekhar Noriefc1bb82009-12-17 18:29:31 +0530156{
157 return platform_driver_probe(&davinci_pm_driver, davinci_pm_probe);
158}