From 871480933a1c28f8a9fed4c4d34d06c439a7a422 Mon Sep 17 00:00:00 2001
From: Srikant Patnaik
Date: Sun, 11 Jan 2015 12:28:04 +0530
Subject: Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.
---
 arch/arm/mach-davinci/cpuidle.c | 162 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 162 insertions(+)
 create mode 100644 arch/arm/mach-davinci/cpuidle.c

(limited to 'arch/arm/mach-davinci/cpuidle.c')

diff --git a/arch/arm/mach-davinci/cpuidle.c b/arch/arm/mach-davinci/cpuidle.c
new file mode 100644
index 00000000..9107691a
--- /dev/null
+++ b/arch/arm/mach-davinci/cpuidle.c
@@ -0,0 +1,162 @@
+/*
+ * CPU idle for DaVinci SoCs
+ *
+ * Copyright (C) 2009 Texas Instruments Incorporated. http://www.ti.com/
+ *
+ * Derived from Marvell Kirkwood CPU idle code
+ * (arch/arm/mach-kirkwood/cpuidle.c)
+ *
+ * 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/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/cpuidle.h>
+#include <linux/io.h>
+#include <linux/export.h>
+#include <asm/proc-fns.h>
+#include <asm/cpuidle.h>
+
+#include <mach/cpuidle.h>
+#include <mach/ddr2.h>
+
+#define DAVINCI_CPUIDLE_MAX_STATES	2
+
+struct davinci_ops {
+	void (*enter) (u32 flags);
+	void (*exit) (u32 flags);
+	u32 flags;
+};
+
+/* Actual code that puts the SoC in different idle states */
+static int davinci_enter_idle(struct cpuidle_device *dev,
+				struct cpuidle_driver *drv,
+						int index)
+{
+	struct cpuidle_state_usage *state_usage = &dev->states_usage[index];
+	struct davinci_ops *ops = cpuidle_get_statedata(state_usage);
+
+	if (ops && ops->enter)
+		ops->enter(ops->flags);
+
+	index = cpuidle_wrap_enter(dev,	drv, index,
+				arm_cpuidle_simple_enter);
+
+	if (ops && ops->exit)
+		ops->exit(ops->flags);
+
+	return index;
+}
+
+/* fields in davinci_ops.flags */
+#define DAVINCI_CPUIDLE_FLAGS_DDR2_PWDN	BIT(0)
+
+static struct cpuidle_driver davinci_idle_driver = {
+	.name			= "cpuidle-davinci",
+	.owner			= THIS_MODULE,
+	.en_core_tk_irqen	= 1,
+	.states[0]		= ARM_CPUIDLE_WFI_STATE,
+	.states[1]		= {
+		.enter			= davinci_enter_idle,
+		.exit_latency		= 10,
+		.target_residency	= 100000,
+		.flags			= CPUIDLE_FLAG_TIME_VALID,
+		.name			= "DDR SR",
+		.desc			= "WFI and DDR Self Refresh",
+	},
+	.state_count = DAVINCI_CPUIDLE_MAX_STATES,
+};
+
+static DEFINE_PER_CPU(struct cpuidle_device, davinci_cpuidle_device);
+static void __iomem *ddr2_reg_base;
+
+static void davinci_save_ddr_power(int enter, bool pdown)
+{
+	u32 val;
+
+	val = __raw_readl(ddr2_reg_base + DDR2_SDRCR_OFFSET);
+
+	if (enter) {
+		if (pdown)
+			val |= DDR2_SRPD_BIT;
+		else
+			val &= ~DDR2_SRPD_BIT;
+		val |= DDR2_LPMODEN_BIT;
+	} else {
+		val &= ~(DDR2_SRPD_BIT | DDR2_LPMODEN_BIT);
+	}
+
+	__raw_writel(val, ddr2_reg_base + DDR2_SDRCR_OFFSET);
+}
+
+static void davinci_c2state_enter(u32 flags)
+{
+	davinci_save_ddr_power(1, !!(flags & DAVINCI_CPUIDLE_FLAGS_DDR2_PWDN));
+}
+
+static void davinci_c2state_exit(u32 flags)
+{
+	davinci_save_ddr_power(0, !!(flags & DAVINCI_CPUIDLE_FLAGS_DDR2_PWDN));
+}
+
+static struct davinci_ops davinci_states[DAVINCI_CPUIDLE_MAX_STATES] = {
+	[1] = {
+		.enter	= davinci_c2state_enter,
+		.exit	= davinci_c2state_exit,
+	},
+};
+
+static int __init davinci_cpuidle_probe(struct platform_device *pdev)
+{
+	int ret;
+	struct cpuidle_device *device;
+	struct davinci_cpuidle_config *pdata = pdev->dev.platform_data;
+
+	device = &per_cpu(davinci_cpuidle_device, smp_processor_id());
+
+	if (!pdata) {
+		dev_err(&pdev->dev, "cannot get platform data\n");
+		return -ENOENT;
+	}
+
+	ddr2_reg_base = pdata->ddr2_ctlr_base;
+
+	if (pdata->ddr2_pdown)
+		davinci_states[1].flags |= DAVINCI_CPUIDLE_FLAGS_DDR2_PWDN;
+	cpuidle_set_statedata(&device->states_usage[1], &davinci_states[1]);
+
+	device->state_count = DAVINCI_CPUIDLE_MAX_STATES;
+
+	ret = cpuidle_register_driver(&davinci_idle_driver);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register driver\n");
+		return ret;
+	}
+
+	ret = cpuidle_register_device(device);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register device\n");
+		cpuidle_unregister_driver(&davinci_idle_driver);
+		return ret;
+	}
+
+	return 0;
+}
+
+static struct platform_driver davinci_cpuidle_driver = {
+	.driver = {
+		.name	= "cpuidle-davinci",
+		.owner	= THIS_MODULE,
+	},
+};
+
+static int __init davinci_cpuidle_init(void)
+{
+	return platform_driver_probe(&davinci_cpuidle_driver,
+						davinci_cpuidle_probe);
+}
+device_initcall(davinci_cpuidle_init);
+
-- 
cgit