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 static int ufs_intel_disable_lcc(struct ufs_hba *hba)
  41 {
  42         u32 attr = UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE);
  43         u32 lcc_enable = 0;
  44
  45         ufshcd_dme_get(hba, attr, &lcc_enable);
  46         if (lcc_enable)
  47                 ufshcd_dme_set(hba, attr, 0);
  48
  49         return 0;
  50 }
  51
  52 static int ufs_intel_link_startup_notify(struct ufs_hba *hba,
  53                                          enum ufs_notify_change_status status)
  54 {
  55         int err = 0;
  56
  57         switch (status) {
  58         case PRE_CHANGE:
  59                 err = ufs_intel_disable_lcc(hba);
  60                 break;
  61         case POST_CHANGE:
  62                 break;
  63         default:
  64                 break;
  65         }
  66
  67         return err;
  68 }
  69
  70 static struct ufs_hba_variant_ops ufs_intel_cnl_hba_vops = {
  71         .name                   = "intel-pci",
  72         .link_startup_notify    = ufs_intel_link_startup_notify,
  73 };
  74
  75 #ifdef CONFIG_PM_SLEEP
  76 /**
  77  * ufshcd_pci_suspend - suspend power management function
  78  * @pdev: pointer to PCI device handle
  79  * @state: power state
  80  *
  81  * Returns 0 if successful
  82  * Returns non-zero otherwise
  83  */
  84 static int ufshcd_pci_suspend(struct device *dev)
  85 {
  86         return ufshcd_system_suspend(dev_get_drvdata(dev));
  87 }
  88
  89 /**
  90  * ufshcd_pci_resume - resume power management function
  91  * @pdev: pointer to PCI device handle
  92  *
  93  * Returns 0 if successful
  94  * Returns non-zero otherwise
  95  */
  96 static int ufshcd_pci_resume(struct device *dev)
  97 {
  98         return ufshcd_system_resume(dev_get_drvdata(dev));
  99 }
 100 #endif /* !CONFIG_PM_SLEEP */
 101
 102 #ifdef CONFIG_PM
 103 static int ufshcd_pci_runtime_suspend(struct device *dev)
 104 {
 105         return ufshcd_runtime_suspend(dev_get_drvdata(dev));
 106 }
 107 static int ufshcd_pci_runtime_resume(struct device *dev)
 108 {
 109         return ufshcd_runtime_resume(dev_get_drvdata(dev));
 110 }
 111 static int ufshcd_pci_runtime_idle(struct device *dev)
 112 {
 113         return ufshcd_runtime_idle(dev_get_drvdata(dev));
 114 }
 115 #endif /* !CONFIG_PM */
 116
 117 /**
 118  * ufshcd_pci_shutdown - main function to put the controller in reset state
 119  * @pdev: pointer to PCI device handle
 120  */
 121 static void ufshcd_pci_shutdown(struct pci_dev *pdev)
 122 {
 123         ufshcd_shutdown((struct ufs_hba *)pci_get_drvdata(pdev));
 124 }
 125
 126 /**
 127  * ufshcd_pci_remove - de-allocate PCI/SCSI host and host memory space
 128  *              data structure memory
 129  * @pdev - pointer to PCI handle
 130  */
 131 static void ufshcd_pci_remove(struct pci_dev *pdev)
 132 {
 133         struct ufs_hba *hba = pci_get_drvdata(pdev);
 134
 135         pm_runtime_forbid(&pdev->dev);
 136         pm_runtime_get_noresume(&pdev->dev);
 137         ufshcd_remove(hba);
 138         ufshcd_dealloc_host(hba);
 139 }
 140
 141 /**
 142  * ufshcd_pci_probe - probe routine of the driver
 143  * @pdev: pointer to PCI device handle
 144  * @id: PCI device id
 145  *
 146  * Returns 0 on success, non-zero value on failure
 147  */
 148 static int
 149 ufshcd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 150 {
 151         struct ufs_hba *hba;
 152         void __iomem *mmio_base;
 153         int err;
 154
 155         err = pcim_enable_device(pdev);
 156         if (err) {
 157                 dev_err(&pdev->dev, "pcim_enable_device failed\n");
 158                 return err;
 159         }
 160
 161         pci_set_master(pdev);
 162
 163         err = pcim_iomap_regions(pdev, 1 << 0, UFSHCD);
 164         if (err < 0) {
 165                 dev_err(&pdev->dev, "request and iomap failed\n");
 166                 return err;
 167         }
 168
 169         mmio_base = pcim_iomap_table(pdev)[0];
 170
 171         err = ufshcd_alloc_host(&pdev->dev, &hba);
 172         if (err) {
 173                 dev_err(&pdev->dev, "Allocation failed\n");
 174                 return err;
 175         }
 176
 177         hba->vops = (struct ufs_hba_variant_ops *)id->driver_data;
 178
 179         err = ufshcd_init(hba, mmio_base, pdev->irq);
 180         if (err) {
 181                 dev_err(&pdev->dev, "Initialization failed\n");
 182                 ufshcd_dealloc_host(hba);
 183                 return err;
 184         }
 185
 186         pci_set_drvdata(pdev, hba);
 187         pm_runtime_put_noidle(&pdev->dev);
 188         pm_runtime_allow(&pdev->dev);
 189
 190         return 0;
 191 }
 192
 193 static const struct dev_pm_ops ufshcd_pci_pm_ops = {
 194         SET_SYSTEM_SLEEP_PM_OPS(ufshcd_pci_suspend,
 195                                 ufshcd_pci_resume)
 196         SET_RUNTIME_PM_OPS(ufshcd_pci_runtime_suspend,
 197                            ufshcd_pci_runtime_resume,
 198                            ufshcd_pci_runtime_idle)
 199 };
 200
 201 static const struct pci_device_id ufshcd_pci_tbl[] = {
 202         { PCI_VENDOR_ID_SAMSUNG, 0xC00C, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
 203         { PCI_VDEVICE(INTEL, 0x9DFA), (kernel_ulong_t)&ufs_intel_cnl_hba_vops },
 204         { }     /* terminate list */
 205 };
 206
 207 MODULE_DEVICE_TABLE(pci, ufshcd_pci_tbl);
 208
 209 static struct pci_driver ufshcd_pci_driver = {
 210         .name = UFSHCD,
 211         .id_table = ufshcd_pci_tbl,
 212         .probe = ufshcd_pci_probe,
 213         .remove = ufshcd_pci_remove,
 214         .shutdown = ufshcd_pci_shutdown,
 215         .driver = {
 216                 .pm = &ufshcd_pci_pm_ops
 217         },
 218 };
 219
 220 module_pci_driver(ufshcd_pci_driver);
 221
 222 MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>");
 223 MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>");
 224 MODULE_DESCRIPTION("UFS host controller PCI glue driver");
 225 MODULE_LICENSE("GPL");
 226 MODULE_VERSION(UFSHCD_DRIVER_VERSION);