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/arch/sh/kernel/cpu/shmobile/pm.c

https://bitbucket.org/ndreys/linux-sunxi
C | 156 lines | 100 code | 24 blank | 32 comment | 2 complexity | e3cb30be3e55310afecf84ad2de7f35e MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  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 */
 23ATOMIC_NOTIFIER_HEAD(sh_mobile_pre_sleep_notifier_list);
 24ATOMIC_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
 48void 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
 71extern char sh_mobile_sleep_enter_start;
 72extern char sh_mobile_sleep_enter_end;
 73
 74extern char sh_mobile_sleep_resume_start;
 75extern char sh_mobile_sleep_resume_end;
 76
 77unsigned long sh_mobile_sleep_supported = SUSP_SH_SLEEP;
 78
 79void 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
131static 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
144static const struct platform_suspend_ops sh_pm_ops = {
145	.enter          = sh_pm_enter,
146	.valid          = suspend_valid_only_mem,
147};
148
149static int __init sh_pm_init(void)
150{
151	suspend_set_ops(&sh_pm_ops);
152	sh_mobile_setup_cpuidle();
153	return 0;
154}
155
156late_initcall(sh_pm_init);