initial_commit

1 files changed, 159 insertions, 0 deletions

diff --git a/arch/arm/mach-davinci/pm.c b/arch/arm/mach-davinci/pm.c
new file mode 100644
index 00000000..04c49f75
--- /dev/null
+++ b/arch/arm/mach-davinci/pm.c
@@ -0,0 +1,159 @@
+/*
+ * DaVinci Power Management Routines
+ *
+ * Copyright (C) 2009 Texas Instruments, Inc. http://www.ti.com/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/pm.h>
+#include <linux/suspend.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/spinlock.h>
+
+#include <asm/cacheflush.h>
+#include <asm/delay.h>
+#include <asm/io.h>
+
+#include <mach/da8xx.h>
+#include <mach/sram.h>
+#include <mach/pm.h>
+
+#include "clock.h"
+
+#define DEEPSLEEP_SLEEPCOUNT_MASK	0xFFFF
+
+static void (*davinci_sram_suspend) (struct davinci_pm_config *);
+static struct davinci_pm_config *pdata;
+
+static void davinci_sram_push(void *dest, void *src, unsigned int size)
+{
+	memcpy(dest, src, size);
+	flush_icache_range((unsigned long)dest, (unsigned long)(dest + size));
+}
+
+static void davinci_pm_suspend(void)
+{
+	unsigned val;
+
+	if (pdata->cpupll_reg_base != pdata->ddrpll_reg_base) {
+
+		/* Switch CPU PLL to bypass mode */
+		val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
+		val &= ~(PLLCTL_PLLENSRC | PLLCTL_PLLEN);
+		__raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
+
+		udelay(PLL_BYPASS_TIME);
+
+		/* Powerdown CPU PLL */
+		val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
+		val |= PLLCTL_PLLPWRDN;
+		__raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
+	}
+
+	/* Configure sleep count in deep sleep register */
+	val = __raw_readl(pdata->deepsleep_reg);
+	val &= ~DEEPSLEEP_SLEEPCOUNT_MASK,
+	val |= pdata->sleepcount;
+	__raw_writel(val, pdata->deepsleep_reg);
+
+	/* System goes to sleep in this call */
+	davinci_sram_suspend(pdata);
+
+	if (pdata->cpupll_reg_base != pdata->ddrpll_reg_base) {
+
+		/* put CPU PLL in reset */
+		val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
+		val &= ~PLLCTL_PLLRST;
+		__raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
+
+		/* put CPU PLL in power down */
+		val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
+		val &= ~PLLCTL_PLLPWRDN;
+		__raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
+
+		/* wait for CPU PLL reset */
+		udelay(PLL_RESET_TIME);
+
+		/* bring CPU PLL out of reset */
+		val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
+		val |= PLLCTL_PLLRST;
+		__raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
+
+		/* Wait for CPU PLL to lock */
+		udelay(PLL_LOCK_TIME);
+
+		/* Remove CPU PLL from bypass mode */
+		val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
+		val &= ~PLLCTL_PLLENSRC;
+		val |= PLLCTL_PLLEN;
+		__raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
+	}
+}
+
+static int davinci_pm_enter(suspend_state_t state)
+{
+	int ret = 0;
+
+	switch (state) {
+	case PM_SUSPEND_STANDBY:
+	case PM_SUSPEND_MEM:
+		davinci_pm_suspend();
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static const struct platform_suspend_ops davinci_pm_ops = {
+	.enter		= davinci_pm_enter,
+	.valid		= suspend_valid_only_mem,
+};
+
+static int __init davinci_pm_probe(struct platform_device *pdev)
+{
+	pdata = pdev->dev.platform_data;
+	if (!pdata) {
+		dev_err(&pdev->dev, "cannot get platform data\n");
+		return -ENOENT;
+	}
+
+	davinci_sram_suspend = sram_alloc(davinci_cpu_suspend_sz, NULL);
+	if (!davinci_sram_suspend) {
+		dev_err(&pdev->dev, "cannot allocate SRAM memory\n");
+		return -ENOMEM;
+	}
+
+	davinci_sram_push(davinci_sram_suspend, davinci_cpu_suspend,
+						davinci_cpu_suspend_sz);
+
+	suspend_set_ops(&davinci_pm_ops);
+
+	return 0;
+}
+
+static int __exit davinci_pm_remove(struct platform_device *pdev)
+{
+	sram_free(davinci_sram_suspend, davinci_cpu_suspend_sz);
+	return 0;
+}
+
+static struct platform_driver davinci_pm_driver = {
+	.driver = {
+		.name	 = "pm-davinci",
+		.owner	 = THIS_MODULE,
+	},
+	.remove = __exit_p(davinci_pm_remove),
+};
+
+static int __init davinci_pm_init(void)
+{
+	return platform_driver_probe(&davinci_pm_driver, davinci_pm_probe);
+}
+late_initcall(davinci_pm_init);