diff options
Diffstat (limited to 'arch/sh/kernel/cpu/shmobile/pm.c')
| -rw-r--r-- | arch/sh/kernel/cpu/shmobile/pm.c | 134 |
1 files changed, 99 insertions, 35 deletions
diff --git a/arch/sh/kernel/cpu/shmobile/pm.c b/arch/sh/kernel/cpu/shmobile/pm.c index 8c067adf683..e5596871270 100644 --- a/arch/sh/kernel/cpu/shmobile/pm.c +++ b/arch/sh/kernel/cpu/shmobile/pm.c @@ -1,5 +1,5 @@ /* - * arch/sh/kernel/cpu/sh4a/pm-sh_mobile.c + * arch/sh/kernel/cpu/shmobile/pm.c * * Power management support code for SuperH Mobile * @@ -15,6 +15,13 @@ #include <linux/suspend.h> #include <asm/suspend.h> #include <asm/uaccess.h> +#include <asm/cacheflush.h> + +/* + * Notifier lists for pre/post sleep notification + */ +ATOMIC_NOTIFIER_HEAD(sh_mobile_pre_sleep_notifier_list); +ATOMIC_NOTIFIER_HEAD(sh_mobile_post_sleep_notifier_list); /* * Sleep modes available on SuperH Mobile: @@ -26,50 +33,106 @@ #define SUSP_MODE_SLEEP (SUSP_SH_SLEEP) #define SUSP_MODE_SLEEP_SF (SUSP_SH_SLEEP | SUSP_SH_SF) #define SUSP_MODE_STANDBY_SF (SUSP_SH_STANDBY | SUSP_SH_SF) +#define SUSP_MODE_RSTANDBY_SF \ + (SUSP_SH_RSTANDBY | SUSP_SH_MMU | SUSP_SH_REGS | SUSP_SH_SF) + /* + * U-standby mode is unsupported since it needs bootloader hacks + */ -/* - * The following modes are not there yet: - * - * R-standby mode is unsupported, but will be added in the future - * U-standby mode is low priority since it needs bootloader hacks - * - * All modes should be tied in with cpuidle. But before that can - * happen we need to keep track of enabled hardware blocks so we - * can avoid entering sleep modes that stop clocks to hardware - * blocks that are in use even though the cpu core is idle. - */ - -extern const unsigned char sh_mobile_standby[]; -extern const unsigned int sh_mobile_standby_size; +#ifdef CONFIG_CPU_SUBTYPE_SH7724 +#define RAM_BASE 0xfd800000 /* RSMEM */ +#else +#define RAM_BASE 0xe5200000 /* ILRAM */ +#endif -static void sh_mobile_call_standby(unsigned long mode) +void sh_mobile_call_standby(unsigned long mode) { - extern void *vbr_base; - void *onchip_mem = (void *)0xe5200000; /* ILRAM */ - void (*standby_onchip_mem)(unsigned long) = onchip_mem; - - /* Note: Wake up from sleep may generate exceptions! - * Setup VBR to point to on-chip ram if self-refresh is - * going to be used. - */ - if (mode & SUSP_SH_SF) - asm volatile("ldc %0, vbr" : : "r" (onchip_mem) : "memory"); - - /* Copy the assembly snippet to the otherwise ununsed ILRAM */ - memcpy(onchip_mem, sh_mobile_standby, sh_mobile_standby_size); - wmb(); - ctrl_barrier(); + void *onchip_mem = (void *)RAM_BASE; + struct sh_sleep_data *sdp = onchip_mem; + void (*standby_onchip_mem)(unsigned long, unsigned long); + + /* code located directly after data structure */ + standby_onchip_mem = (void *)(sdp + 1); + + atomic_notifier_call_chain(&sh_mobile_pre_sleep_notifier_list, + mode, NULL); + + /* flush the caches if MMU flag is set */ + if (mode & SUSP_SH_MMU) + flush_cache_all(); /* Let assembly snippet in on-chip memory handle the rest */ - standby_onchip_mem(mode); + standby_onchip_mem(mode, RAM_BASE); + + atomic_notifier_call_chain(&sh_mobile_post_sleep_notifier_list, + mode, NULL); +} + +extern char sh_mobile_sleep_enter_start; +extern char sh_mobile_sleep_enter_end; + +extern char sh_mobile_sleep_resume_start; +extern char sh_mobile_sleep_resume_end; + +unsigned long sh_mobile_sleep_supported = SUSP_SH_SLEEP; + +void sh_mobile_register_self_refresh(unsigned long flags, + void *pre_start, void *pre_end, + void *post_start, void *post_end) +{ + void *onchip_mem = (void *)RAM_BASE; + void *vp; + struct sh_sleep_data *sdp; + int n; - /* Put VBR back in System RAM again */ - if (mode & SUSP_SH_SF) - asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory"); + /* part 0: data area */ + sdp = onchip_mem; + sdp->addr.stbcr = 0xa4150020; /* STBCR */ + sdp->addr.bar = 0xa4150040; /* BAR */ + sdp->addr.pteh = 0xff000000; /* PTEH */ + sdp->addr.ptel = 0xff000004; /* PTEL */ + sdp->addr.ttb = 0xff000008; /* TTB */ + sdp->addr.tea = 0xff00000c; /* TEA */ + sdp->addr.mmucr = 0xff000010; /* MMUCR */ + sdp->addr.ptea = 0xff000034; /* PTEA */ + sdp->addr.pascr = 0xff000070; /* PASCR */ + sdp->addr.irmcr = 0xff000078; /* IRMCR */ + sdp->addr.ccr = 0xff00001c; /* CCR */ + sdp->addr.ramcr = 0xff000074; /* RAMCR */ + vp = sdp + 1; + + /* part 1: common code to enter sleep mode */ + n = &sh_mobile_sleep_enter_end - &sh_mobile_sleep_enter_start; + memcpy(vp, &sh_mobile_sleep_enter_start, n); + vp += roundup(n, 4); + + /* part 2: board specific code to enter self-refresh mode */ + n = pre_end - pre_start; + memcpy(vp, pre_start, n); + sdp->sf_pre = (unsigned long)vp; + vp += roundup(n, 4); + + /* part 3: board specific code to resume from self-refresh mode */ + n = post_end - post_start; + memcpy(vp, post_start, n); + sdp->sf_post = (unsigned long)vp; + vp += roundup(n, 4); + + /* part 4: common code to resume from sleep mode */ + WARN_ON(vp > (onchip_mem + 0x600)); + vp = onchip_mem + 0x600; /* located at interrupt vector */ + n = &sh_mobile_sleep_resume_end - &sh_mobile_sleep_resume_start; + memcpy(vp, &sh_mobile_sleep_resume_start, n); + sdp->resume = (unsigned long)vp; + + sh_mobile_sleep_supported |= flags; } static int sh_pm_enter(suspend_state_t state) { + if (!(sh_mobile_sleep_supported & SUSP_MODE_STANDBY_SF)) + return -ENXIO; + local_irq_disable(); set_bl_bit(); sh_mobile_call_standby(SUSP_MODE_STANDBY_SF); @@ -86,6 +149,7 @@ static struct platform_suspend_ops sh_pm_ops = { static int __init sh_pm_init(void) { suspend_set_ops(&sh_pm_ops); + sh_mobile_setup_cpuidle(); return 0; } |