62694735ca
Add runtime PM helpers to suspend/resume UFS controller at runtime. Enable runtime PM by default for pci and platform drivers as the initialized hardware can suspend if it is not used after bootup. Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org> Signed-off-by: Santosh Y <santoshsy@gmail.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
227 lines
5.6 KiB
C
227 lines
5.6 KiB
C
/*
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* Universal Flash Storage Host controller Platform bus based glue driver
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*
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* This code is based on drivers/scsi/ufs/ufshcd-pltfrm.c
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* Copyright (C) 2011-2013 Samsung India Software Operations
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*
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* Authors:
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* Santosh Yaraganavi <santosh.sy@samsung.com>
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* Vinayak Holikatti <h.vinayak@samsung.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* See the COPYING file in the top-level directory or visit
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* <http://www.gnu.org/licenses/gpl-2.0.html>
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* This program is provided "AS IS" and "WITH ALL FAULTS" and
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* without warranty of any kind. You are solely responsible for
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* determining the appropriateness of using and distributing
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* the program and assume all risks associated with your exercise
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* of rights with respect to the program, including but not limited
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* to infringement of third party rights, the risks and costs of
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* program errors, damage to or loss of data, programs or equipment,
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* and unavailability or interruption of operations. Under no
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* circumstances will the contributor of this Program be liable for
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* any damages of any kind arising from your use or distribution of
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* this program.
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*/
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include "ufshcd.h"
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#ifdef CONFIG_PM
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/**
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* ufshcd_pltfrm_suspend - suspend power management function
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* @dev: pointer to device handle
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*
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*
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* Returns 0
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*/
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static int ufshcd_pltfrm_suspend(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct ufs_hba *hba = platform_get_drvdata(pdev);
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/*
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* TODO:
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* 1. Call ufshcd_suspend
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* 2. Do bus specific power management
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*/
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disable_irq(hba->irq);
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return 0;
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}
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/**
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* ufshcd_pltfrm_resume - resume power management function
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* @dev: pointer to device handle
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*
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* Returns 0
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*/
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static int ufshcd_pltfrm_resume(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct ufs_hba *hba = platform_get_drvdata(pdev);
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/*
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* TODO:
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* 1. Call ufshcd_resume.
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* 2. Do bus specific wake up
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*/
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enable_irq(hba->irq);
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return 0;
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}
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#else
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#define ufshcd_pltfrm_suspend NULL
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#define ufshcd_pltfrm_resume NULL
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#endif
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#ifdef CONFIG_PM_RUNTIME
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static int ufshcd_pltfrm_runtime_suspend(struct device *dev)
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{
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struct ufs_hba *hba = dev_get_drvdata(dev);
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if (!hba)
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return 0;
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return ufshcd_runtime_suspend(hba);
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}
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static int ufshcd_pltfrm_runtime_resume(struct device *dev)
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{
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struct ufs_hba *hba = dev_get_drvdata(dev);
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if (!hba)
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return 0;
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return ufshcd_runtime_resume(hba);
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}
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static int ufshcd_pltfrm_runtime_idle(struct device *dev)
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{
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struct ufs_hba *hba = dev_get_drvdata(dev);
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if (!hba)
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return 0;
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return ufshcd_runtime_idle(hba);
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}
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#else /* !CONFIG_PM_RUNTIME */
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#define ufshcd_pltfrm_runtime_suspend NULL
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#define ufshcd_pltfrm_runtime_resume NULL
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#define ufshcd_pltfrm_runtime_idle NULL
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#endif /* CONFIG_PM_RUNTIME */
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/**
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* ufshcd_pltfrm_probe - probe routine of the driver
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* @pdev: pointer to Platform device handle
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*
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* Returns 0 on success, non-zero value on failure
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*/
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static int ufshcd_pltfrm_probe(struct platform_device *pdev)
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{
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struct ufs_hba *hba;
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void __iomem *mmio_base;
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struct resource *mem_res;
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int irq, err;
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struct device *dev = &pdev->dev;
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mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!mem_res) {
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dev_err(dev, "Memory resource not available\n");
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err = -ENODEV;
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goto out;
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}
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mmio_base = devm_ioremap_resource(dev, mem_res);
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if (IS_ERR(mmio_base)) {
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dev_err(dev, "memory map failed\n");
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err = PTR_ERR(mmio_base);
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goto out;
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}
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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dev_err(dev, "IRQ resource not available\n");
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err = -ENODEV;
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goto out;
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}
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pm_runtime_set_active(&pdev->dev);
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pm_runtime_enable(&pdev->dev);
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err = ufshcd_init(dev, &hba, mmio_base, irq);
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if (err) {
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dev_err(dev, "Intialization failed\n");
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goto out_disable_rpm;
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}
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platform_set_drvdata(pdev, hba);
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return 0;
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out_disable_rpm:
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pm_runtime_disable(&pdev->dev);
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pm_runtime_set_suspended(&pdev->dev);
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out:
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return err;
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}
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/**
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* ufshcd_pltfrm_remove - remove platform driver routine
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* @pdev: pointer to platform device handle
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*
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* Returns 0 on success, non-zero value on failure
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*/
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static int ufshcd_pltfrm_remove(struct platform_device *pdev)
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{
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struct ufs_hba *hba = platform_get_drvdata(pdev);
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pm_runtime_get_sync(&(pdev)->dev);
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disable_irq(hba->irq);
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ufshcd_remove(hba);
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return 0;
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}
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static const struct of_device_id ufs_of_match[] = {
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{ .compatible = "jedec,ufs-1.1"},
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{},
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};
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static const struct dev_pm_ops ufshcd_dev_pm_ops = {
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.suspend = ufshcd_pltfrm_suspend,
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.resume = ufshcd_pltfrm_resume,
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.runtime_suspend = ufshcd_pltfrm_runtime_suspend,
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.runtime_resume = ufshcd_pltfrm_runtime_resume,
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.runtime_idle = ufshcd_pltfrm_runtime_idle,
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};
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static struct platform_driver ufshcd_pltfrm_driver = {
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.probe = ufshcd_pltfrm_probe,
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.remove = ufshcd_pltfrm_remove,
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.driver = {
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.name = "ufshcd",
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.owner = THIS_MODULE,
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.pm = &ufshcd_dev_pm_ops,
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.of_match_table = ufs_of_match,
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},
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};
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module_platform_driver(ufshcd_pltfrm_driver);
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MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>");
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MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>");
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MODULE_DESCRIPTION("UFS host controller Pltform bus based glue driver");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(UFSHCD_DRIVER_VERSION);
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