LXR linux/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
  40static 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
  52static 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
  70static 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 * @dev: pointer to PCI device handle
  79 *
  80 * Returns 0 if successful
  81 * Returns non-zero otherwise
  82 */
  83static int ufshcd_pci_suspend(struct device *dev)
  84{
  85        return ufshcd_system_suspend(dev_get_drvdata(dev));
  86}
  87
  88/**
  89 * ufshcd_pci_resume - resume power management function
  90 * @dev: pointer to PCI device handle
  91 *
  92 * Returns 0 if successful
  93 * Returns non-zero otherwise
  94 */
  95static int ufshcd_pci_resume(struct device *dev)
  96{
  97        return ufshcd_system_resume(dev_get_drvdata(dev));
  98}
  99#endif /* !CONFIG_PM_SLEEP */
 100
 101#ifdef CONFIG_PM
 102static int ufshcd_pci_runtime_suspend(struct device *dev)
 103{
 104        return ufshcd_runtime_suspend(dev_get_drvdata(dev));
 105}
 106static int ufshcd_pci_runtime_resume(struct device *dev)
 107{
 108        return ufshcd_runtime_resume(dev_get_drvdata(dev));
 109}
 110static int ufshcd_pci_runtime_idle(struct device *dev)
 111{
 112        return ufshcd_runtime_idle(dev_get_drvdata(dev));
 113}
 114#endif /* !CONFIG_PM */
 115
 116/**
 117 * ufshcd_pci_shutdown - main function to put the controller in reset state
 118 * @pdev: pointer to PCI device handle
 119 */
 120static void ufshcd_pci_shutdown(struct pci_dev *pdev)
 121{
 122        ufshcd_shutdown((struct ufs_hba *)pci_get_drvdata(pdev));
 123}
 124
 125/**
 126 * ufshcd_pci_remove - de-allocate PCI/SCSI host and host memory space
 127 *              data structure memory
 128 * @pdev: pointer to PCI handle
 129 */
 130static void ufshcd_pci_remove(struct pci_dev *pdev)
 131{
 132        struct ufs_hba *hba = pci_get_drvdata(pdev);
 133
 134        pm_runtime_forbid(&pdev->dev);
 135        pm_runtime_get_noresume(&pdev->dev);
 136        ufshcd_remove(hba);
 137        ufshcd_dealloc_host(hba);
 138}
 139
 140/**
 141 * ufshcd_pci_probe - probe routine of the driver
 142 * @pdev: pointer to PCI device handle
 143 * @id: PCI device id
 144 *
 145 * Returns 0 on success, non-zero value on failure
 146 */
 147static int
 148ufshcd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 149{
 150        struct ufs_hba *hba;
 151        void __iomem *mmio_base;
 152        int err;
 153
 154        err = pcim_enable_device(pdev);
 155        if (err) {
 156                dev_err(&pdev->dev, "pcim_enable_device failed\n");
 157                return err;
 158        }
 159
 160        pci_set_master(pdev);
 161
 162        err = pcim_iomap_regions(pdev, 1 << 0, UFSHCD);
 163        if (err < 0) {
 164                dev_err(&pdev->dev, "request and iomap failed\n");
 165                return err;
 166        }
 167
 168        mmio_base = pcim_iomap_table(pdev)[0];
 169
 170        err = ufshcd_alloc_host(&pdev->dev, &hba);
 171        if (err) {
 172                dev_err(&pdev->dev, "Allocation failed\n");
 173                return err;
 174        }
 175
 176        hba->vops = (struct ufs_hba_variant_ops *)id->driver_data;
 177
 178        err = ufshcd_init(hba, mmio_base, pdev->irq);
 179        if (err) {
 180                dev_err(&pdev->dev, "Initialization failed\n");
 181                ufshcd_dealloc_host(hba);
 182                return err;
 183        }
 184
 185        pci_set_drvdata(pdev, hba);
 186        pm_runtime_put_noidle(&pdev->dev);
 187        pm_runtime_allow(&pdev->dev);
 188
 189        return 0;
 190}
 191
 192static const struct dev_pm_ops ufshcd_pci_pm_ops = {
 193        SET_SYSTEM_SLEEP_PM_OPS(ufshcd_pci_suspend,
 194                                ufshcd_pci_resume)
 195        SET_RUNTIME_PM_OPS(ufshcd_pci_runtime_suspend,
 196                           ufshcd_pci_runtime_resume,
 197                           ufshcd_pci_runtime_idle)
 198};
 199
 200static const struct pci_device_id ufshcd_pci_tbl[] = {
 201        { PCI_VENDOR_ID_SAMSUNG, 0xC00C, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
 202        { PCI_VDEVICE(INTEL, 0x9DFA), (kernel_ulong_t)&ufs_intel_cnl_hba_vops },
 203        { }     /* terminate list */
 204};
 205
 206MODULE_DEVICE_TABLE(pci, ufshcd_pci_tbl);
 207
 208static struct pci_driver ufshcd_pci_driver = {
 209        .name = UFSHCD,
 210        .id_table = ufshcd_pci_tbl,
 211        .probe = ufshcd_pci_probe,
 212        .remove = ufshcd_pci_remove,
 213        .shutdown = ufshcd_pci_shutdown,
 214        .driver = {
 215                .pm = &ufshcd_pci_pm_ops
 216        },
 217};
 218
 219module_pci_driver(ufshcd_pci_driver);
 220
 221MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>");
 222MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>");
 223MODULE_DESCRIPTION("UFS host controller PCI glue driver");
 224MODULE_LICENSE("GPL");
 225MODULE_VERSION(UFSHCD_DRIVER_VERSION);
 226