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d2912cb15b
Based on 2 normalized pattern(s): 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 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 # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
99 lines
2.2 KiB
C
99 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* CPU idle for DaVinci SoCs
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*
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* Copyright (C) 2009 Texas Instruments Incorporated. http://www.ti.com/
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*
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* Derived from Marvell Kirkwood CPU idle code
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* (arch/arm/mach-kirkwood/cpuidle.c)
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/cpuidle.h>
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#include <linux/io.h>
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#include <linux/export.h>
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#include <asm/cpuidle.h>
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#include "cpuidle.h"
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#include "ddr2.h"
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#define DAVINCI_CPUIDLE_MAX_STATES 2
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static void __iomem *ddr2_reg_base;
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static bool ddr2_pdown;
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static void davinci_save_ddr_power(int enter, bool pdown)
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{
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u32 val;
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val = __raw_readl(ddr2_reg_base + DDR2_SDRCR_OFFSET);
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if (enter) {
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if (pdown)
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val |= DDR2_SRPD_BIT;
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else
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val &= ~DDR2_SRPD_BIT;
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val |= DDR2_LPMODEN_BIT;
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} else {
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val &= ~(DDR2_SRPD_BIT | DDR2_LPMODEN_BIT);
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}
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__raw_writel(val, ddr2_reg_base + DDR2_SDRCR_OFFSET);
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}
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/* Actual code that puts the SoC in different idle states */
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static int davinci_enter_idle(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int index)
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{
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davinci_save_ddr_power(1, ddr2_pdown);
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cpu_do_idle();
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davinci_save_ddr_power(0, ddr2_pdown);
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return index;
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}
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static struct cpuidle_driver davinci_idle_driver = {
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.name = "cpuidle-davinci",
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.owner = THIS_MODULE,
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.states[0] = ARM_CPUIDLE_WFI_STATE,
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.states[1] = {
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.enter = davinci_enter_idle,
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.exit_latency = 10,
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.target_residency = 10000,
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.name = "DDR SR",
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.desc = "WFI and DDR Self Refresh",
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},
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.state_count = DAVINCI_CPUIDLE_MAX_STATES,
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};
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static int __init davinci_cpuidle_probe(struct platform_device *pdev)
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{
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struct davinci_cpuidle_config *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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ddr2_reg_base = pdata->ddr2_ctlr_base;
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ddr2_pdown = pdata->ddr2_pdown;
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return cpuidle_register(&davinci_idle_driver, NULL);
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}
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static struct platform_driver davinci_cpuidle_driver = {
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.driver = {
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.name = "cpuidle-davinci",
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},
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};
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static int __init davinci_cpuidle_init(void)
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{
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return platform_driver_probe(&davinci_cpuidle_driver,
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davinci_cpuidle_probe);
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}
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device_initcall(davinci_cpuidle_init);
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