zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/arch/arm/mach-davinci/cpuidle.c b/ap/os/linux/linux-3.4.x/arch/arm/mach-davinci/cpuidle.c
new file mode 100644
index 0000000..9107691
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/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);
+