Merge branch 'connlimit' of git://dev.medozas.de/linux
[pandora-kernel.git] / arch / sh / kernel / cpu / shmobile / pm.c
1 /*
2  * arch/sh/kernel/cpu/shmobile/pm.c
3  *
4  * Power management support code for SuperH Mobile
5  *
6  *  Copyright (C) 2009 Magnus Damm
7  *
8  * This file is subject to the terms and conditions of the GNU General Public
9  * License.  See the file "COPYING" in the main directory of this archive
10  * for more details.
11  */
12 #include <linux/init.h>
13 #include <linux/kernel.h>
14 #include <linux/io.h>
15 #include <linux/suspend.h>
16 #include <asm/suspend.h>
17 #include <asm/uaccess.h>
18 #include <asm/cacheflush.h>
19
20 /*
21  * Notifier lists for pre/post sleep notification
22  */
23 ATOMIC_NOTIFIER_HEAD(sh_mobile_pre_sleep_notifier_list);
24 ATOMIC_NOTIFIER_HEAD(sh_mobile_post_sleep_notifier_list);
25
26 /*
27  * Sleep modes available on SuperH Mobile:
28  *
29  * Sleep mode is just plain "sleep" instruction
30  * Sleep Self-Refresh mode is above plus RAM put in Self-Refresh
31  * Standby Self-Refresh mode is above plus stopped clocks
32  */
33 #define SUSP_MODE_SLEEP         (SUSP_SH_SLEEP)
34 #define SUSP_MODE_SLEEP_SF      (SUSP_SH_SLEEP | SUSP_SH_SF)
35 #define SUSP_MODE_STANDBY_SF    (SUSP_SH_STANDBY | SUSP_SH_SF)
36 #define SUSP_MODE_RSTANDBY_SF \
37         (SUSP_SH_RSTANDBY | SUSP_SH_MMU | SUSP_SH_REGS | SUSP_SH_SF)
38  /*
39   * U-standby mode is unsupported since it needs bootloader hacks
40   */
41
42 #ifdef CONFIG_CPU_SUBTYPE_SH7724
43 #define RAM_BASE 0xfd800000 /* RSMEM */
44 #else
45 #define RAM_BASE 0xe5200000 /* ILRAM */
46 #endif
47
48 void sh_mobile_call_standby(unsigned long mode)
49 {
50         void *onchip_mem = (void *)RAM_BASE;
51         struct sh_sleep_data *sdp = onchip_mem;
52         void (*standby_onchip_mem)(unsigned long, unsigned long);
53
54         /* code located directly after data structure */
55         standby_onchip_mem = (void *)(sdp + 1);
56
57         atomic_notifier_call_chain(&sh_mobile_pre_sleep_notifier_list,
58                                    mode, NULL);
59
60         /* flush the caches if MMU flag is set */
61         if (mode & SUSP_SH_MMU)
62                 flush_cache_all();
63
64         /* Let assembly snippet in on-chip memory handle the rest */
65         standby_onchip_mem(mode, RAM_BASE);
66
67         atomic_notifier_call_chain(&sh_mobile_post_sleep_notifier_list,
68                                    mode, NULL);
69 }
70
71 extern char sh_mobile_sleep_enter_start;
72 extern char sh_mobile_sleep_enter_end;
73
74 extern char sh_mobile_sleep_resume_start;
75 extern char sh_mobile_sleep_resume_end;
76
77 unsigned long sh_mobile_sleep_supported = SUSP_SH_SLEEP;
78
79 void sh_mobile_register_self_refresh(unsigned long flags,
80                                      void *pre_start, void *pre_end,
81                                      void *post_start, void *post_end)
82 {
83         void *onchip_mem = (void *)RAM_BASE;
84         void *vp;
85         struct sh_sleep_data *sdp;
86         int n;
87
88         /* part 0: data area */
89         sdp = onchip_mem;
90         sdp->addr.stbcr = 0xa4150020; /* STBCR */
91         sdp->addr.bar = 0xa4150040; /* BAR */
92         sdp->addr.pteh = 0xff000000; /* PTEH */
93         sdp->addr.ptel = 0xff000004; /* PTEL */
94         sdp->addr.ttb = 0xff000008; /* TTB */
95         sdp->addr.tea = 0xff00000c; /* TEA */
96         sdp->addr.mmucr = 0xff000010; /* MMUCR */
97         sdp->addr.ptea = 0xff000034; /* PTEA */
98         sdp->addr.pascr = 0xff000070; /* PASCR */
99         sdp->addr.irmcr = 0xff000078; /* IRMCR */
100         sdp->addr.ccr = 0xff00001c; /* CCR */
101         sdp->addr.ramcr = 0xff000074; /* RAMCR */
102         vp = sdp + 1;
103
104         /* part 1: common code to enter sleep mode */
105         n = &sh_mobile_sleep_enter_end - &sh_mobile_sleep_enter_start;
106         memcpy(vp, &sh_mobile_sleep_enter_start, n);
107         vp += roundup(n, 4);
108
109         /* part 2: board specific code to enter self-refresh mode */
110         n = pre_end - pre_start;
111         memcpy(vp, pre_start, n);
112         sdp->sf_pre = (unsigned long)vp;
113         vp += roundup(n, 4);
114
115         /* part 3: board specific code to resume from self-refresh mode */
116         n = post_end - post_start;
117         memcpy(vp, post_start, n);
118         sdp->sf_post = (unsigned long)vp;
119         vp += roundup(n, 4);
120
121         /* part 4: common code to resume from sleep mode */
122         WARN_ON(vp > (onchip_mem + 0x600));
123         vp = onchip_mem + 0x600; /* located at interrupt vector */
124         n = &sh_mobile_sleep_resume_end - &sh_mobile_sleep_resume_start;
125         memcpy(vp, &sh_mobile_sleep_resume_start, n);
126         sdp->resume = (unsigned long)vp;
127
128         sh_mobile_sleep_supported |= flags;
129 }
130
131 static int sh_pm_enter(suspend_state_t state)
132 {
133         if (!(sh_mobile_sleep_supported & SUSP_MODE_STANDBY_SF))
134                 return -ENXIO;
135
136         local_irq_disable();
137         set_bl_bit();
138         sh_mobile_call_standby(SUSP_MODE_STANDBY_SF);
139         local_irq_disable();
140         clear_bl_bit();
141         return 0;
142 }
143
144 static const struct platform_suspend_ops sh_pm_ops = {
145         .enter          = sh_pm_enter,
146         .valid          = suspend_valid_only_mem,
147 };
148
149 static int __init sh_pm_init(void)
150 {
151         suspend_set_ops(&sh_pm_ops);
152         sh_mobile_setup_cpuidle();
153         return 0;
154 }
155
156 late_initcall(sh_pm_init);