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 -ENOSYS
  47  */
  48 static int ufshcd_pci_suspend(struct device *dev)
  49 {
  50         /*
  51          * TODO:
  52          * 1. Call ufshcd_suspend
  53          * 2. Do bus specific power management
  54          */
  55
  56         return -ENOSYS;
  57 }
  58
  59 /**
  60  * ufshcd_pci_resume - resume power management function
  61  * @pdev: pointer to PCI device handle
  62  *
  63  * Returns -ENOSYS
  64  */
  65 static int ufshcd_pci_resume(struct device *dev)
  66 {
  67         /*
  68          * TODO:
  69          * 1. Call ufshcd_resume.
  70          * 2. Do bus specific wake up
  71          */
  72
  73         return -ENOSYS;
  74 }
  75 #else
  76 #define ufshcd_pci_suspend      NULL
  77 #define ufshcd_pci_resume       NULL
  78 #endif /* CONFIG_PM */
  79
  80 #ifdef CONFIG_PM_RUNTIME
  81 static int ufshcd_pci_runtime_suspend(struct device *dev)
  82 {
  83         struct ufs_hba *hba = dev_get_drvdata(dev);
  84
  85         if (!hba)
  86                 return 0;
  87
  88         return ufshcd_runtime_suspend(hba);
  89 }
  90 static int ufshcd_pci_runtime_resume(struct device *dev)
  91 {
  92         struct ufs_hba *hba = dev_get_drvdata(dev);
  93
  94         if (!hba)
  95                 return 0;
  96
  97         return ufshcd_runtime_resume(hba);
  98 }
  99 static int ufshcd_pci_runtime_idle(struct device *dev)
 100 {
 101         struct ufs_hba *hba = dev_get_drvdata(dev);
 102
 103         if (!hba)
 104                 return 0;
 105
 106         return ufshcd_runtime_idle(hba);
 107 }
 108 #else /* !CONFIG_PM_RUNTIME */
 109 #define ufshcd_pci_runtime_suspend      NULL
 110 #define ufshcd_pci_runtime_resume       NULL
 111 #define ufshcd_pci_runtime_idle NULL
 112 #endif /* CONFIG_PM_RUNTIME */
 113
 114 /**
 115  * ufshcd_pci_shutdown - main function to put the controller in reset state
 116  * @pdev: pointer to PCI device handle
 117  */
 118 static void ufshcd_pci_shutdown(struct pci_dev *pdev)
 119 {
 120         ufshcd_hba_stop((struct ufs_hba *)pci_get_drvdata(pdev));
 121 }
 122
 123 /**
 124  * ufshcd_pci_remove - de-allocate PCI/SCSI host and host memory space
 125  *              data structure memory
 126  * @pdev - pointer to PCI handle
 127  */
 128 static void ufshcd_pci_remove(struct pci_dev *pdev)
 129 {
 130         struct ufs_hba *hba = pci_get_drvdata(pdev);
 131
 132         pm_runtime_forbid(&pdev->dev);
 133         pm_runtime_get_noresume(&pdev->dev);
 134         ufshcd_remove(hba);
 135 }
 136
 137 /**
 138  * ufshcd_pci_probe - probe routine of the driver
 139  * @pdev: pointer to PCI device handle
 140  * @id: PCI device id
 141  *
 142  * Returns 0 on success, non-zero value on failure
 143  */
 144 static int
 145 ufshcd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 146 {
 147         struct ufs_hba *hba;
 148         void __iomem *mmio_base;
 149         int err;
 150
 151         err = pcim_enable_device(pdev);
 152         if (err) {
 153                 dev_err(&pdev->dev, "pcim_enable_device failed\n");
 154                 return err;
 155         }
 156
 157         pci_set_master(pdev);
 158
 159         err = pcim_iomap_regions(pdev, 1 << 0, UFSHCD);
 160         if (err < 0) {
 161                 dev_err(&pdev->dev, "request and iomap failed\n");
 162                 return err;
 163         }
 164
 165         mmio_base = pcim_iomap_table(pdev)[0];
 166
 167         err = ufshcd_init(&pdev->dev, &hba, mmio_base, pdev->irq);
 168         if (err) {
 169                 dev_err(&pdev->dev, "Initialization failed\n");
 170                 return err;
 171         }
 172
 173         pci_set_drvdata(pdev, hba);
 174         pm_runtime_put_noidle(&pdev->dev);
 175         pm_runtime_allow(&pdev->dev);
 176
 177         return 0;
 178 }
 179
 180 static const struct dev_pm_ops ufshcd_pci_pm_ops = {
 181         .suspend        = ufshcd_pci_suspend,
 182         .resume         = ufshcd_pci_resume,
 183         .runtime_suspend = ufshcd_pci_runtime_suspend,
 184         .runtime_resume  = ufshcd_pci_runtime_resume,
 185         .runtime_idle    = ufshcd_pci_runtime_idle,
 186 };
 187
 188 static DEFINE_PCI_DEVICE_TABLE(ufshcd_pci_tbl) = {
 189         { PCI_VENDOR_ID_SAMSUNG, 0xC00C, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
 190         { }     /* terminate list */
 191 };
 192
 193 MODULE_DEVICE_TABLE(pci, ufshcd_pci_tbl);
 194
 195 static struct pci_driver ufshcd_pci_driver = {
 196         .name = UFSHCD,
 197         .id_table = ufshcd_pci_tbl,
 198         .probe = ufshcd_pci_probe,
 199         .remove = ufshcd_pci_remove,
 200         .shutdown = ufshcd_pci_shutdown,
 201         .driver = {
 202                 .pm = &ufshcd_pci_pm_ops
 203         },
 204 };
 205
 206 module_pci_driver(ufshcd_pci_driver);
 207
 208 MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>");
 209 MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>");
 210 MODULE_DESCRIPTION("UFS host controller PCI glue driver");
 211 MODULE_LICENSE("GPL");
 212 MODULE_VERSION(UFSHCD_DRIVER_VERSION);