1 /*
2 * arch/arm/mach-pnx4008/pm.c
3 *
4 * Power Management driver for PNX4008
5 *
6 * Authors: Vitaly Wool, Dmitry Chigirev <source@mvista.com>
7 *
8 * 2005 (c) MontaVista Software, Inc. This file is licensed under
9 * the terms of the GNU General Public License version 2. This program
10 * is licensed "as is" without any warranty of any kind, whether express
11 * or implied.
12 */
13
14 #include <linux/pm.h>
15 #include <linux/rtc.h>
16 #include <linux/sched.h>
17 #include <linux/proc_fs.h>
18 #include <linux/suspend.h>
19 #include <linux/delay.h>
20 #include <linux/clk.h>
21
22 #include <asm/io.h>
23 #include <asm/mach-types.h>
24 #include <asm/cacheflush.h>
25 #include <asm/arch/pm.h>
26 #include <asm/arch/clock.h>
27
28 #define SRAM_VA IO_ADDRESS(PNX4008_IRAM_BASE)
29
30 static void *saved_sram;
31
32 static struct clk *pll4_clk;
33
34 static inline void pnx4008_standby(void)
35 {
36 void (*pnx4008_cpu_standby_ptr) (void);
37
38 local_irq_disable();
39 local_fiq_disable();
40
41 clk_disable(pll4_clk);
42
43 /*saving portion of SRAM to be used by suspend function. */
44 memcpy(saved_sram, (void *)SRAM_VA, pnx4008_cpu_standby_sz);
45
46 /*make sure SRAM copy gets physically written into SDRAM.
47 SDRAM will be placed into self-refresh during power down */
48 flush_cache_all();
49
50 /*copy suspend function into SRAM */
51 memcpy((void *)SRAM_VA, pnx4008_cpu_standby, pnx4008_cpu_standby_sz);
52
53 /*do suspend */
54 pnx4008_cpu_standby_ptr = (void *)SRAM_VA;
55 pnx4008_cpu_standby_ptr();
56
57 /*restoring portion of SRAM that was used by suspend function */
58 memcpy((void *)SRAM_VA, saved_sram, pnx4008_cpu_standby_sz);
59
60 clk_enable(pll4_clk);
61
62 local_fiq_enable();
63 local_irq_enable();
64 }
65
66 static inline void pnx4008_suspend(void)
67 {
68 void (*pnx4008_cpu_suspend_ptr) (void);
69
70 local_irq_disable();
71 local_fiq_disable();
72
73 clk_disable(pll4_clk);
74
75 __raw_writel(0xffffffff, START_INT_RSR_REG(SE_PIN_BASE_INT));
76 __raw_writel(0xffffffff, START_INT_RSR_REG(SE_INT_BASE_INT));
77
78 /*saving portion of SRAM to be used by suspend function. */
79 memcpy(saved_sram, (void *)SRAM_VA, pnx4008_cpu_suspend_sz);
80
81 /*make sure SRAM copy gets physically written into SDRAM.
82 SDRAM will be placed into self-refresh during power down */
83 flush_cache_all();
84
85 /*copy suspend function into SRAM */
86 memcpy((void *)SRAM_VA, pnx4008_cpu_suspend, pnx4008_cpu_suspend_sz);
87
88 /*do suspend */
89 pnx4008_cpu_suspend_ptr = (void *)SRAM_VA;
90 pnx4008_cpu_suspend_ptr();
91
92 /*restoring portion of SRAM that was used by suspend function */
93 memcpy((void *)SRAM_VA, saved_sram, pnx4008_cpu_suspend_sz);
94
95 clk_enable(pll4_clk);
96
97 local_fiq_enable();
98 local_irq_enable();
99 }
100
101 static int pnx4008_pm_enter(suspend_state_t state)
102 {
103 switch (state) {
104 case PM_SUSPEND_STANDBY:
105 pnx4008_standby();
106 break;
107 case PM_SUSPEND_MEM:
108 pnx4008_suspend();
109 break;
110 }
111 return 0;
112 }
113
114 static int pnx4008_pm_valid(suspend_state_t state)
115 {
116 return (state == PM_SUSPEND_STANDBY) ||
117 (state == PM_SUSPEND_MEM);
118 }
119
120 static struct platform_suspend_ops pnx4008_pm_ops = {
121 .enter = pnx4008_pm_enter,
122 .valid = pnx4008_pm_valid,
123 };
124
125 static int __init pnx4008_pm_init(void)
126 {
127 u32 sram_size_to_allocate;
128
129 pll4_clk = clk_get(0, "ck_pll4");
130 if (IS_ERR(pll4_clk)) {
131 printk(KERN_ERR
132 "PM Suspend cannot acquire ARM(PLL4) clock control\n");
133 return PTR_ERR(pll4_clk);
134 }
135
136 if (pnx4008_cpu_standby_sz > pnx4008_cpu_suspend_sz)
137 sram_size_to_allocate = pnx4008_cpu_standby_sz;
138 else
139 sram_size_to_allocate = pnx4008_cpu_suspend_sz;
140
141 saved_sram = kmalloc(sram_size_to_allocate, GFP_ATOMIC);
142 if (!saved_sram) {
143 printk(KERN_ERR
144 "PM Suspend: cannot allocate memory to save portion of SRAM\n");
145 clk_put(pll4_clk);
146 return -ENOMEM;
147 }
148
149 suspend_set_ops(&pnx4008_pm_ops);
150 return 0;
151 }
152
153 late_initcall(pnx4008_pm_init);
154
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