drivers/scsi/ufs/ufshcd-pci.c

   1 /*
   2  * Universal Flash Storage Host controller PCI glue driver
   3  *
   4  * This code is based on drivers/scsi/ufs/ufshcd-pci.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/pci.h>
  38 #include <linux/pm_runtime.h>
  39
  40 #ifdef CONFIG_PM
  41 /**
  42  * ufshcd_pci_suspend - suspend power management function
  43  * @pdev: pointer to PCI device handle
  44  * @state: power state
  45  *
  46  * Returns 0 if successful
  47  * Returns non-zero otherwise
  48  */
  49 static int ufshcd_pci_suspend(struct device *dev)
  50 {
  51         return ufshcd_system_suspend(dev_get_drvdata(dev));
  52 }
  53
  54 /**
  55  * ufshcd_pci_resume - resume power management function
  56  * @pdev: pointer to PCI device handle
  57  *
  58  * Returns 0 if successful
  59  * Returns non-zero otherwise
  60  */
  61 static int ufshcd_pci_resume(struct device *dev)
  62 {
  63         return ufshcd_system_resume(dev_get_drvdata(dev));
  64 }
  65
  66 static int ufshcd_pci_runtime_suspend(struct device *dev)
  67 {
  68         return ufshcd_runtime_suspend(dev_get_drvdata(dev));
  69 }
  70 static int ufshcd_pci_runtime_resume(struct device *dev)
  71 {
  72         return ufshcd_runtime_resume(dev_get_drvdata(dev));
  73 }
  74 static int ufshcd_pci_runtime_idle(struct device *dev)
  75 {
  76         return ufshcd_runtime_idle(dev_get_drvdata(dev));
  77 }
  78 #else /* !CONFIG_PM */
  79 #define ufshcd_pci_suspend      NULL
  80 #define ufshcd_pci_resume       NULL
  81 #define ufshcd_pci_runtime_suspend      NULL
  82 #define ufshcd_pci_runtime_resume       NULL
  83 #define ufshcd_pci_runtime_idle NULL
  84 #endif /* CONFIG_PM */
  85
  86 /**
  87  * ufshcd_pci_shutdown - main function to put the controller in reset state
  88  * @pdev: pointer to PCI device handle
  89  */
  90 static void ufshcd_pci_shutdown(struct pci_dev *pdev)
  91 {
  92         ufshcd_shutdown((struct ufs_hba *)pci_get_drvdata(pdev));
  93 }
  94
  95 /**
  96  * ufshcd_pci_remove - de-allocate PCI/SCSI host and host memory space
  97  *              data structure memory
  98  * @pdev - pointer to PCI handle
  99  */
 100 static void ufshcd_pci_remove(struct pci_dev *pdev)
 101 {
 102         struct ufs_hba *hba = pci_get_drvdata(pdev);
 103
 104         pm_runtime_forbid(&pdev->dev);
 105         pm_runtime_get_noresume(&pdev->dev);
 106         ufshcd_remove(hba);
 107 }
 108
 109 /**
 110  * ufshcd_pci_probe - probe routine of the driver
 111  * @pdev: pointer to PCI device handle
 112  * @id: PCI device id
 113  *
 114  * Returns 0 on success, non-zero value on failure
 115  */
 116 static int
 117 ufshcd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 118 {
 119         struct ufs_hba *hba;
 120         void __iomem *mmio_base;
 121         int err;
 122
 123         err = pcim_enable_device(pdev);
 124         if (err) {
 125                 dev_err(&pdev->dev, "pcim_enable_device failed\n");
 126                 return err;
 127         }
 128
 129         pci_set_master(pdev);
 130
 131         err = pcim_iomap_regions(pdev, 1 << 0, UFSHCD);
 132         if (err < 0) {
 133                 dev_err(&pdev->dev, "request and iomap failed\n");
 134                 return err;
 135         }
 136
 137         mmio_base = pcim_iomap_table(pdev)[0];
 138
 139         err = ufshcd_alloc_host(&pdev->dev, &hba);
 140         if (err) {
 141                 dev_err(&pdev->dev, "Allocation failed\n");
 142                 return err;
 143         }
 144
 145         INIT_LIST_HEAD(&hba->clk_list_head);
 146
 147         err = ufshcd_init(hba, mmio_base, pdev->irq);
 148         if (err) {
 149                 dev_err(&pdev->dev, "Initialization failed\n");
 150                 return err;
 151         }
 152
 153         pci_set_drvdata(pdev, hba);
 154         pm_runtime_put_noidle(&pdev->dev);
 155         pm_runtime_allow(&pdev->dev);
 156
 157         return 0;
 158 }
 159
 160 static const struct dev_pm_ops ufshcd_pci_pm_ops = {
 161         .suspend        = ufshcd_pci_suspend,
 162         .resume         = ufshcd_pci_resume,
 163         .runtime_suspend = ufshcd_pci_runtime_suspend,
 164         .runtime_resume  = ufshcd_pci_runtime_resume,
 165         .runtime_idle    = ufshcd_pci_runtime_idle,
 166 };
 167
 168 static const struct pci_device_id ufshcd_pci_tbl[] = {
 169         { PCI_VENDOR_ID_SAMSUNG, 0xC00C, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
 170         { }     /* terminate list */
 171 };
 172
 173 MODULE_DEVICE_TABLE(pci, ufshcd_pci_tbl);
 174
 175 static struct pci_driver ufshcd_pci_driver = {
 176         .name = UFSHCD,
 177         .id_table = ufshcd_pci_tbl,
 178         .probe = ufshcd_pci_probe,
 179         .remove = ufshcd_pci_remove,
 180         .shutdown = ufshcd_pci_shutdown,
 181         .driver = {
 182                 .pm = &ufshcd_pci_pm_ops
 183         },
 184 };
 185
 186 module_pci_driver(ufshcd_pci_driver);
 187
 188 MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>");
 189 MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>");
 190 MODULE_DESCRIPTION("UFS host controller PCI glue driver");
 191 MODULE_LICENSE("GPL");
 192 MODULE_VERSION(UFSHCD_DRIVER_VERSION);