drivers/scsi/ufs/ufshcd-pltfrm.c

   1 /*
   2  * Universal Flash Storage Host controller Platform bus based glue driver
   3  *
   4  * This code is based on drivers/scsi/ufs/ufshcd-pltfrm.c
   5  * Copyright (C) 2011-2013 Samsung India Software Operations
   6  *
   7  * Authors:
   8  *      Santosh Yaraganavi <santosh.sy@samsung.com>
   9  *      Vinayak Holikatti <h.vinayak@samsung.com>
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  * See the COPYING file in the top-level directory or visit
  16  * <http://www.gnu.org/licenses/gpl-2.0.html>
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * This program is provided "AS IS" and "WITH ALL FAULTS" and
  24  * without warranty of any kind. You are solely responsible for
  25  * determining the appropriateness of using and distributing
  26  * the program and assume all risks associated with your exercise
  27  * of rights with respect to the program, including but not limited
  28  * to infringement of third party rights, the risks and costs of
  29  * program errors, damage to or loss of data, programs or equipment,
  30  * and unavailability or interruption of operations. Under no
  31  * circumstances will the contributor of this Program be liable for
  32  * any damages of any kind arising from your use or distribution of
  33  * this program.
  34  */
  35
  36 #include "ufshcd.h"
  37 #include <linux/platform_device.h>
  38
  39 #ifdef CONFIG_PM
  40 /**
  41  * ufshcd_pltfrm_suspend - suspend power management function
  42  * @dev: pointer to device handle
  43  *
  44  *
  45  * Returns 0
  46  */
  47 static int ufshcd_pltfrm_suspend(struct device *dev)
  48 {
  49         struct platform_device *pdev = to_platform_device(dev);
  50         struct ufs_hba *hba =  platform_get_drvdata(pdev);
  51
  52         /*
  53          * TODO:
  54          * 1. Call ufshcd_suspend
  55          * 2. Do bus specific power management
  56          */
  57
  58         disable_irq(hba->irq);
  59
  60         return 0;
  61 }
  62
  63 /**
  64  * ufshcd_pltfrm_resume - resume power management function
  65  * @dev: pointer to device handle
  66  *
  67  * Returns 0
  68  */
  69 static int ufshcd_pltfrm_resume(struct device *dev)
  70 {
  71         struct platform_device *pdev = to_platform_device(dev);
  72         struct ufs_hba *hba =  platform_get_drvdata(pdev);
  73
  74         /*
  75          * TODO:
  76          * 1. Call ufshcd_resume.
  77          * 2. Do bus specific wake up
  78          */
  79
  80         enable_irq(hba->irq);
  81
  82         return 0;
  83 }
  84 #else
  85 #define ufshcd_pltfrm_suspend   NULL
  86 #define ufshcd_pltfrm_resume    NULL
  87 #endif
  88
  89 /**
  90  * ufshcd_pltfrm_probe - probe routine of the driver
  91  * @pdev: pointer to Platform device handle
  92  *
  93  * Returns 0 on success, non-zero value on failure
  94  */
  95 static int ufshcd_pltfrm_probe(struct platform_device *pdev)
  96 {
  97         struct ufs_hba *hba;
  98         void __iomem *mmio_base;
  99         struct resource *mem_res;
 100         struct resource *irq_res;
 101         resource_size_t mem_size;
 102         int err;
 103         struct device *dev = &pdev->dev;
 104
 105         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 106         if (!mem_res) {
 107                 dev_err(&pdev->dev,
 108                         "Memory resource not available\n");
 109                 err = -ENODEV;
 110                 goto out_error;
 111         }
 112
 113         mem_size = resource_size(mem_res);
 114         if (!request_mem_region(mem_res->start, mem_size, "ufshcd")) {
 115                 dev_err(&pdev->dev,
 116                         "Cannot reserve the memory resource\n");
 117                 err = -EBUSY;
 118                 goto out_error;
 119         }
 120
 121         mmio_base = ioremap_nocache(mem_res->start, mem_size);
 122         if (!mmio_base) {
 123                 dev_err(&pdev->dev, "memory map failed\n");
 124                 err = -ENOMEM;
 125                 goto out_release_regions;
 126         }
 127
 128         irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 129         if (!irq_res) {
 130                 dev_err(&pdev->dev, "IRQ resource not available\n");
 131                 err = -ENODEV;
 132                 goto out_iounmap;
 133         }
 134
 135         err = dma_set_coherent_mask(dev, dev->coherent_dma_mask);
 136         if (err) {
 137                 dev_err(&pdev->dev, "set dma mask failed\n");
 138                 goto out_iounmap;
 139         }
 140
 141         err = ufshcd_init(&pdev->dev, &hba, mmio_base, irq_res->start);
 142         if (err) {
 143                 dev_err(&pdev->dev, "Intialization failed\n");
 144                 goto out_iounmap;
 145         }
 146
 147         platform_set_drvdata(pdev, hba);
 148
 149         return 0;
 150
 151 out_iounmap:
 152         iounmap(mmio_base);
 153 out_release_regions:
 154         release_mem_region(mem_res->start, mem_size);
 155 out_error:
 156         return err;
 157 }
 158
 159 /**
 160  * ufshcd_pltfrm_remove - remove platform driver routine
 161  * @pdev: pointer to platform device handle
 162  *
 163  * Returns 0 on success, non-zero value on failure
 164  */
 165 static int ufshcd_pltfrm_remove(struct platform_device *pdev)
 166 {
 167         struct resource *mem_res;
 168         resource_size_t mem_size;
 169         struct ufs_hba *hba =  platform_get_drvdata(pdev);
 170
 171         disable_irq(hba->irq);
 172
 173         /* Some buggy controllers raise interrupt after
 174          * the resources are removed. So first we unregister the
 175          * irq handler and then the resources used by driver
 176          */
 177
 178         free_irq(hba->irq, hba);
 179         ufshcd_remove(hba);
 180         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 181         if (!mem_res)
 182                 dev_err(&pdev->dev, "ufshcd: Memory resource not available\n");
 183         else {
 184                 mem_size = resource_size(mem_res);
 185                 release_mem_region(mem_res->start, mem_size);
 186         }
 187         platform_set_drvdata(pdev, NULL);
 188         return 0;
 189 }
 190
 191 static const struct of_device_id ufs_of_match[] = {
 192         { .compatible = "jedec,ufs-1.1"},
 193 };
 194
 195 static const struct dev_pm_ops ufshcd_dev_pm_ops = {
 196         .suspend        = ufshcd_pltfrm_suspend,
 197         .resume         = ufshcd_pltfrm_resume,
 198 };
 199
 200 static struct platform_driver ufshcd_pltfrm_driver = {
 201         .probe  = ufshcd_pltfrm_probe,
 202         .remove = ufshcd_pltfrm_remove,
 203         .driver = {
 204                 .name   = "ufshcd",
 205                 .owner  = THIS_MODULE,
 206                 .pm     = &ufshcd_dev_pm_ops,
 207                 .of_match_table = ufs_of_match,
 208         },
 209 };
 210
 211 module_platform_driver(ufshcd_pltfrm_driver);
 212
 213 MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>");
 214 MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>");
 215 MODULE_DESCRIPTION("UFS host controller Pltform bus based glue driver");
 216 MODULE_LICENSE("GPL");
 217 MODULE_VERSION(UFSHCD_DRIVER_VERSION);