108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
/*
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* sh7372 Power management support
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*
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* Copyright (C) 2011 Magnus Damm
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/pm.h>
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#include <linux/suspend.h>
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#include <linux/cpuidle.h>
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#include <linux/module.h>
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#include <linux/list.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/tlbflush.h>
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#include <mach/common.h>
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#define SMFRAM 0xe6a70000
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#define SYSTBCR 0xe6150024
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#define SBAR 0xe6180020
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#define APARMBAREA 0xe6f10020
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static void sh7372_enter_core_standby(void)
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{
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void __iomem *smfram = (void __iomem *)SMFRAM;
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__raw_writel(0, APARMBAREA); /* translate 4k */
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__raw_writel(__pa(sh7372_cpu_resume), SBAR); /* set reset vector */
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__raw_writel(0x10, SYSTBCR); /* enable core standby */
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__raw_writel(0, smfram + 0x3c); /* clear page table address */
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sh7372_cpu_suspend();
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cpu_init();
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/* if page table address is non-NULL then we have been powered down */
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if (__raw_readl(smfram + 0x3c)) {
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__raw_writel(__raw_readl(smfram + 0x40),
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__va(__raw_readl(smfram + 0x3c)));
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flush_tlb_all();
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set_cr(__raw_readl(smfram + 0x38));
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}
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__raw_writel(0, SYSTBCR); /* disable core standby */
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__raw_writel(0, SBAR); /* disable reset vector translation */
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}
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#ifdef CONFIG_CPU_IDLE
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static void sh7372_cpuidle_setup(struct cpuidle_device *dev)
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{
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struct cpuidle_state *state;
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int i = dev->state_count;
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state = &dev->states[i];
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snprintf(state->name, CPUIDLE_NAME_LEN, "C2");
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strncpy(state->desc, "Core Standby Mode", CPUIDLE_DESC_LEN);
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state->exit_latency = 10;
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state->target_residency = 20 + 10;
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state->power_usage = 1; /* perhaps not */
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state->flags = 0;
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state->flags |= CPUIDLE_FLAG_TIME_VALID;
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shmobile_cpuidle_modes[i] = sh7372_enter_core_standby;
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dev->state_count = i + 1;
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}
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static void sh7372_cpuidle_init(void)
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{
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shmobile_cpuidle_setup = sh7372_cpuidle_setup;
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}
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#else
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static void sh7372_cpuidle_init(void) {}
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#endif
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#ifdef CONFIG_SUSPEND
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static int sh7372_enter_suspend(suspend_state_t suspend_state)
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{
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sh7372_enter_core_standby();
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return 0;
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}
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static void sh7372_suspend_init(void)
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{
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shmobile_suspend_ops.enter = sh7372_enter_suspend;
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}
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#else
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static void sh7372_suspend_init(void) {}
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#endif
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#define DBGREG1 0xe6100020
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#define DBGREG9 0xe6100040
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void __init sh7372_pm_init(void)
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{
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/* enable DBG hardware block to kick SYSC */
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__raw_writel(0x0000a500, DBGREG9);
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__raw_writel(0x0000a501, DBGREG9);
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__raw_writel(0x00000000, DBGREG1);
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sh7372_suspend_init();
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sh7372_cpuidle_init();
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}
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