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
|
/*
* arch/arm/mach-pnx4008/pm.c
*
* Power Management driver for PNX4008
*
* Authors: Vitaly Wool, Dmitry Chigirev <source@mvista.com>
*
* 2005 (c) MontaVista Software, Inc. This file is licensed under
* the terms of the GNU General Public License version 2. This program
* is licensed "as is" without any warranty of any kind, whether express
* or implied.
*/
#include <linux/pm.h>
#include <linux/rtc.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/suspend.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <asm/cacheflush.h>
#include <mach/hardware.h>
#include <mach/pm.h>
#include <mach/clock.h>
#define SRAM_VA IO_ADDRESS(PNX4008_IRAM_BASE)
static void *saved_sram;
static struct clk *pll4_clk;
static inline void pnx4008_standby(void)
{
void (*pnx4008_cpu_standby_ptr) (void);
local_irq_disable();
local_fiq_disable();
clk_disable(pll4_clk);
/*saving portion of SRAM to be used by suspend function. */
memcpy(saved_sram, (void *)SRAM_VA, pnx4008_cpu_standby_sz);
/*make sure SRAM copy gets physically written into SDRAM.
SDRAM will be placed into self-refresh during power down */
flush_cache_all();
/*copy suspend function into SRAM */
memcpy((void *)SRAM_VA, pnx4008_cpu_standby, pnx4008_cpu_standby_sz);
/*do suspend */
pnx4008_cpu_standby_ptr = (void *)SRAM_VA;
pnx4008_cpu_standby_ptr();
/*restoring portion of SRAM that was used by suspend function */
memcpy((void *)SRAM_VA, saved_sram, pnx4008_cpu_standby_sz);
clk_enable(pll4_clk);
local_fiq_enable();
local_irq_enable();
}
static inline void pnx4008_suspend(void)
{
void (*pnx4008_cpu_suspend_ptr) (void);
local_irq_disable();
local_fiq_disable();
clk_disable(pll4_clk);
__raw_writel(0xffffffff, START_INT_RSR_REG(SE_PIN_BASE_INT));
__raw_writel(0xffffffff, START_INT_RSR_REG(SE_INT_BASE_INT));
/*saving portion of SRAM to be used by suspend function. */
memcpy(saved_sram, (void *)SRAM_VA, pnx4008_cpu_suspend_sz);
/*make sure SRAM copy gets physically written into SDRAM.
SDRAM will be placed into self-refresh during power down */
flush_cache_all();
/*copy suspend function into SRAM */
memcpy((void *)SRAM_VA, pnx4008_cpu_suspend, pnx4008_cpu_suspend_sz);
/*do suspend */
pnx4008_cpu_suspend_ptr = (void *)SRAM_VA;
pnx4008_cpu_suspend_ptr();
/*restoring portion of SRAM that was used by suspend function */
memcpy((void *)SRAM_VA, saved_sram, pnx4008_cpu_suspend_sz);
clk_enable(pll4_clk);
local_fiq_enable();
local_irq_enable();
}
static int pnx4008_pm_enter(suspend_state_t state)
{
switch (state) {
case PM_SUSPEND_STANDBY:
pnx4008_standby();
break;
case PM_SUSPEND_MEM:
pnx4008_suspend();
break;
}
return 0;
}
static int pnx4008_pm_valid(suspend_state_t state)
{
return (state == PM_SUSPEND_STANDBY) ||
(state == PM_SUSPEND_MEM);
}
static struct platform_suspend_ops pnx4008_pm_ops = {
.enter = pnx4008_pm_enter,
.valid = pnx4008_pm_valid,
};
static int __init pnx4008_pm_init(void)
{
u32 sram_size_to_allocate;
pll4_clk = clk_get(0, "ck_pll4");
if (IS_ERR(pll4_clk)) {
printk(KERN_ERR
"PM Suspend cannot acquire ARM(PLL4) clock control\n");
return PTR_ERR(pll4_clk);
}
if (pnx4008_cpu_standby_sz > pnx4008_cpu_suspend_sz)
sram_size_to_allocate = pnx4008_cpu_standby_sz;
else
sram_size_to_allocate = pnx4008_cpu_suspend_sz;
saved_sram = kmalloc(sram_size_to_allocate, GFP_ATOMIC);
if (!saved_sram) {
printk(KERN_ERR
"PM Suspend: cannot allocate memory to save portion of SRAM\n");
clk_put(pll4_clk);
return -ENOMEM;
}
suspend_set_ops(&pnx4008_pm_ops);
return 0;
}
late_initcall(pnx4008_pm_init);
|
