diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/arm/mach-davinci/cpuidle.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/arm/mach-davinci/cpuidle.c | 162 |
1 files changed, 0 insertions, 162 deletions
diff --git a/ANDROID_3.4.5/arch/arm/mach-davinci/cpuidle.c b/ANDROID_3.4.5/arch/arm/mach-davinci/cpuidle.c deleted file mode 100644 index 9107691a..00000000 --- a/ANDROID_3.4.5/arch/arm/mach-davinci/cpuidle.c +++ /dev/null @@ -1,162 +0,0 @@ -/* - * 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); - |