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