1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
/*
* DaVinci Power Management Routines
*
* Copyright (C) 2009 Texas Instruments, Inc. http://www.ti.com/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/pm.h>
#include <linux/suspend.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/spinlock.h>
#include <asm/cacheflush.h>
#include <asm/delay.h>
#include <mach/da8xx.h>
#include <mach/sram.h>
#include <mach/pm.h>
#include "clock.h"
#define DEEPSLEEP_SLEEPCOUNT_MASK 0xFFFF
static void (*davinci_sram_suspend) (struct davinci_pm_config *);
static struct davinci_pm_config *pdata;
static void davinci_sram_push(void *dest, void *src, unsigned int size)
{
memcpy(dest, src, size);
flush_icache_range((unsigned long)dest, (unsigned long)(dest + size));
}
static void davinci_pm_suspend(void)
{
unsigned val;
if (pdata->cpupll_reg_base != pdata->ddrpll_reg_base) {
/* Switch CPU PLL to bypass mode */
val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
val &= ~(PLLCTL_PLLENSRC | PLLCTL_PLLEN);
__raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
udelay(PLL_BYPASS_TIME);
/* Powerdown CPU PLL */
val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
val |= PLLCTL_PLLPWRDN;
__raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
}
/* Configure sleep count in deep sleep register */
val = __raw_readl(pdata->deepsleep_reg);
val &= ~DEEPSLEEP_SLEEPCOUNT_MASK,
val |= pdata->sleepcount;
__raw_writel(val, pdata->deepsleep_reg);
/* System goes to sleep in this call */
davinci_sram_suspend(pdata);
if (pdata->cpupll_reg_base != pdata->ddrpll_reg_base) {
/* put CPU PLL in reset */
val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
val &= ~PLLCTL_PLLRST;
__raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
/* put CPU PLL in power down */
val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
val &= ~PLLCTL_PLLPWRDN;
__raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
/* wait for CPU PLL reset */
udelay(PLL_RESET_TIME);
/* bring CPU PLL out of reset */
val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
val |= PLLCTL_PLLRST;
__raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
/* Wait for CPU PLL to lock */
udelay(PLL_LOCK_TIME);
/* Remove CPU PLL from bypass mode */
val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
val &= ~PLLCTL_PLLENSRC;
val |= PLLCTL_PLLEN;
__raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
}
}
static int davinci_pm_enter(suspend_state_t state)
{
int ret = 0;
switch (state) {
case PM_SUSPEND_STANDBY:
case PM_SUSPEND_MEM:
davinci_pm_suspend();
break;
default:
ret = -EINVAL;
}
return ret;
}
static const struct platform_suspend_ops davinci_pm_ops = {
.enter = davinci_pm_enter,
.valid = suspend_valid_only_mem,
};
static int __init davinci_pm_probe(struct platform_device *pdev)
{
pdata = pdev->dev.platform_data;
if (!pdata) {
dev_err(&pdev->dev, "cannot get platform data\n");
return -ENOENT;
}
davinci_sram_suspend = sram_alloc(davinci_cpu_suspend_sz, NULL);
if (!davinci_sram_suspend) {
dev_err(&pdev->dev, "cannot allocate SRAM memory\n");
return -ENOMEM;
}
davinci_sram_push(davinci_sram_suspend, davinci_cpu_suspend,
davinci_cpu_suspend_sz);
suspend_set_ops(&davinci_pm_ops);
return 0;
}
static int __exit davinci_pm_remove(struct platform_device *pdev)
{
sram_free(davinci_sram_suspend, davinci_cpu_suspend_sz);
return 0;
}
static struct platform_driver davinci_pm_driver = {
.driver = {
.name = "pm-davinci",
.owner = THIS_MODULE,
},
.remove = __exit_p(davinci_pm_remove),
};
static int __init davinci_pm_init(void)
{
return platform_driver_probe(&davinci_pm_driver, davinci_pm_probe);
}
late_initcall(davinci_pm_init);
|
