mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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5643aebbc0
This patch adds support for basic suspend doing a CPUx wfi for OMAP4. All powerdomains are for now are kept programmed in ON state. Signed-off-by: Rajendra Nayak <rnayak@ti.com> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Cc: Kevin Hilman <khilman@deeprootsystems.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
136 lines
2.4 KiB
C
136 lines
2.4 KiB
C
/*
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* OMAP4 Power Management Routines
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*
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* Copyright (C) 2010 Texas Instruments, Inc.
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* Rajendra Nayak <rnayak@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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/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 <plat/powerdomain.h>
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#include <mach/omap4-common.h>
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struct power_state {
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struct powerdomain *pwrdm;
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u32 next_state;
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#ifdef CONFIG_SUSPEND
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u32 saved_state;
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#endif
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struct list_head node;
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};
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static LIST_HEAD(pwrst_list);
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#ifdef CONFIG_SUSPEND
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static int omap4_pm_prepare(void)
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{
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disable_hlt();
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return 0;
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}
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static int omap4_pm_suspend(void)
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{
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do_wfi();
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return 0;
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}
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static int omap4_pm_enter(suspend_state_t suspend_state)
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{
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int ret = 0;
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switch (suspend_state) {
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case PM_SUSPEND_STANDBY:
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case PM_SUSPEND_MEM:
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ret = omap4_pm_suspend();
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break;
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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static void omap4_pm_finish(void)
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{
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enable_hlt();
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return;
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}
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static int omap4_pm_begin(suspend_state_t state)
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{
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return 0;
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}
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static void omap4_pm_end(void)
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{
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return;
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}
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static struct platform_suspend_ops omap_pm_ops = {
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.begin = omap4_pm_begin,
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.end = omap4_pm_end,
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.prepare = omap4_pm_prepare,
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.enter = omap4_pm_enter,
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.finish = omap4_pm_finish,
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.valid = suspend_valid_only_mem,
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};
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#endif /* CONFIG_SUSPEND */
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static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
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{
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struct power_state *pwrst;
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if (!pwrdm->pwrsts)
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return 0;
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pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC);
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if (!pwrst)
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return -ENOMEM;
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pwrst->pwrdm = pwrdm;
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pwrst->next_state = PWRDM_POWER_ON;
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list_add(&pwrst->node, &pwrst_list);
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return pwrdm_set_next_pwrst(pwrst->pwrdm, pwrst->next_state);
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}
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/**
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* omap4_pm_init - Init routine for OMAP4 PM
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*
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* Initializes all powerdomain and clockdomain target states
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* and all PRCM settings.
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*/
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static int __init omap4_pm_init(void)
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{
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int ret;
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if (!cpu_is_omap44xx())
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return -ENODEV;
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pr_err("Power Management for TI OMAP4.\n");
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#ifdef CONFIG_PM
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ret = pwrdm_for_each(pwrdms_setup, NULL);
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if (ret) {
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pr_err("Failed to setup powerdomains\n");
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goto err2;
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}
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#endif
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#ifdef CONFIG_SUSPEND
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suspend_set_ops(&omap_pm_ops);
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#endif /* CONFIG_SUSPEND */
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err2:
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return ret;
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}
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late_initcall(omap4_pm_init);
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