160 lines
3.8 KiB
C
160 lines
3.8 KiB
C
/*
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* DaVinci Power Management Routines
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*
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* Copyright (C) 2009 Texas Instruments, Inc. http://www.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/platform_device.h>
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#include <linux/clk.h>
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#include <linux/spinlock.h>
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#include <asm/cacheflush.h>
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#include <asm/delay.h>
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#include <asm/io.h>
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#include <mach/common.h>
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#include <mach/da8xx.h>
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#include <mach/sram.h>
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#include <mach/pm.h>
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#include "clock.h"
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#define DEEPSLEEP_SLEEPCOUNT_MASK 0xFFFF
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static void (*davinci_sram_suspend) (struct davinci_pm_config *);
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static struct davinci_pm_config *pdata;
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static void davinci_sram_push(void *dest, void *src, unsigned int size)
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{
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memcpy(dest, src, size);
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flush_icache_range((unsigned long)dest, (unsigned long)(dest + size));
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}
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static void davinci_pm_suspend(void)
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{
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unsigned val;
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if (pdata->cpupll_reg_base != pdata->ddrpll_reg_base) {
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/* Switch CPU PLL to bypass mode */
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val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
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val &= ~(PLLCTL_PLLENSRC | PLLCTL_PLLEN);
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__raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
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udelay(PLL_BYPASS_TIME);
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/* Powerdown CPU PLL */
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val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
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val |= PLLCTL_PLLPWRDN;
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__raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
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}
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/* Configure sleep count in deep sleep register */
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val = __raw_readl(pdata->deepsleep_reg);
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val &= ~DEEPSLEEP_SLEEPCOUNT_MASK,
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val |= pdata->sleepcount;
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__raw_writel(val, pdata->deepsleep_reg);
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/* System goes to sleep in this call */
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davinci_sram_suspend(pdata);
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if (pdata->cpupll_reg_base != pdata->ddrpll_reg_base) {
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/* put CPU PLL in reset */
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val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
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val &= ~PLLCTL_PLLRST;
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__raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
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/* put CPU PLL in power down */
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val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
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val &= ~PLLCTL_PLLPWRDN;
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__raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
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/* wait for CPU PLL reset */
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udelay(PLL_RESET_TIME);
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/* bring CPU PLL out of reset */
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val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
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val |= PLLCTL_PLLRST;
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__raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
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/* Wait for CPU PLL to lock */
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udelay(PLL_LOCK_TIME);
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/* Remove CPU PLL from bypass mode */
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val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
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val &= ~PLLCTL_PLLENSRC;
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val |= PLLCTL_PLLEN;
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__raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
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}
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}
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static int davinci_pm_enter(suspend_state_t state)
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{
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int ret = 0;
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switch (state) {
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case PM_SUSPEND_STANDBY:
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case PM_SUSPEND_MEM:
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davinci_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 const struct platform_suspend_ops davinci_pm_ops = {
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.enter = davinci_pm_enter,
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.valid = suspend_valid_only_mem,
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};
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static int __init davinci_pm_probe(struct platform_device *pdev)
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{
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pdata = pdev->dev.platform_data;
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if (!pdata) {
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dev_err(&pdev->dev, "cannot get platform data\n");
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return -ENOENT;
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}
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davinci_sram_suspend = sram_alloc(davinci_cpu_suspend_sz, NULL);
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if (!davinci_sram_suspend) {
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dev_err(&pdev->dev, "cannot allocate SRAM memory\n");
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return -ENOMEM;
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}
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davinci_sram_push(davinci_sram_suspend, davinci_cpu_suspend,
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davinci_cpu_suspend_sz);
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suspend_set_ops(&davinci_pm_ops);
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return 0;
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}
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static int __exit davinci_pm_remove(struct platform_device *pdev)
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{
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sram_free(davinci_sram_suspend, davinci_cpu_suspend_sz);
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return 0;
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}
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static struct platform_driver davinci_pm_driver = {
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.driver = {
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.name = "pm-davinci",
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.owner = THIS_MODULE,
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},
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.remove = __exit_p(davinci_pm_remove),
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};
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int __init davinci_pm_init(void)
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{
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return platform_driver_probe(&davinci_pm_driver, davinci_pm_probe);
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}
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