drivers/spi/spi-dw-pci.c

   1 /*
   2  * PCI interface driver for DW SPI Core
   3  *
   4  * Copyright (c) 2009, Intel Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 #include <linux/interrupt.h>
  21 #include <linux/pci.h>
  22 #include <linux/slab.h>
  23 #include <linux/spi/spi.h>
  24 #include <linux/module.h>
  25
  26 #include "spi-dw.h"
  27
  28 #define DRIVER_NAME "dw_spi_pci"
  29
  30 struct dw_spi_pci {
  31         struct pci_dev  *pdev;
  32         struct dw_spi   dws;
  33 };
  34
  35 static int spi_pci_probe(struct pci_dev *pdev,
  36         const struct pci_device_id *ent)
  37 {
  38         struct dw_spi_pci *dwpci;
  39         struct dw_spi *dws;
  40         int pci_bar = 0;
  41         int ret;
  42
  43         dev_info(&pdev->dev, "found PCI SPI controller(ID: %04x:%04x)\n",
  44                 pdev->vendor, pdev->device);
  45
  46         ret = pci_enable_device(pdev);
  47         if (ret)
  48                 return ret;
  49
  50         dwpci = kzalloc(sizeof(struct dw_spi_pci), GFP_KERNEL);
  51         if (!dwpci) {
  52                 ret = -ENOMEM;
  53                 goto err_disable;
  54         }
  55
  56         dwpci->pdev = pdev;
  57         dws = &dwpci->dws;
  58
  59         /* Get basic io resource and map it */
  60         dws->paddr = pci_resource_start(pdev, pci_bar);
  61         dws->iolen = pci_resource_len(pdev, pci_bar);
  62
  63         ret = pci_request_region(pdev, pci_bar, dev_name(&pdev->dev));
  64         if (ret)
  65                 goto err_kfree;
  66
  67         dws->regs = ioremap_nocache((unsigned long)dws->paddr,
  68                                 pci_resource_len(pdev, pci_bar));
  69         if (!dws->regs) {
  70                 ret = -ENOMEM;
  71                 goto err_release_reg;
  72         }
  73
  74         dws->parent_dev = &pdev->dev;
  75         dws->bus_num = 0;
  76         dws->num_cs = 4;
  77         dws->irq = pdev->irq;
  78
  79         /*
  80          * Specific handling for Intel MID paltforms, like dma setup,
  81          * clock rate, FIFO depth.
  82          */
  83         if (pdev->device == 0x0800) {
  84                 ret = dw_spi_mid_init(dws);
  85                 if (ret)
  86                         goto err_unmap;
  87         }
  88
  89         ret = dw_spi_add_host(dws);
  90         if (ret)
  91                 goto err_unmap;
  92
  93         /* PCI hook and SPI hook use the same drv data */
  94         pci_set_drvdata(pdev, dwpci);
  95         return 0;
  96
  97 err_unmap:
  98         iounmap(dws->regs);
  99 err_release_reg:
 100         pci_release_region(pdev, pci_bar);
 101 err_kfree:
 102         kfree(dwpci);
 103 err_disable:
 104         pci_disable_device(pdev);
 105         return ret;
 106 }
 107
 108 static void spi_pci_remove(struct pci_dev *pdev)
 109 {
 110         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
 111
 112         dw_spi_remove_host(&dwpci->dws);
 113         iounmap(dwpci->dws.regs);
 114         pci_release_region(pdev, 0);
 115         kfree(dwpci);
 116         pci_disable_device(pdev);
 117 }
 118
 119 #ifdef CONFIG_PM
 120 static int spi_suspend(struct pci_dev *pdev, pm_message_t state)
 121 {
 122         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
 123         int ret;
 124
 125         ret = dw_spi_suspend_host(&dwpci->dws);
 126         if (ret)
 127                 return ret;
 128         pci_save_state(pdev);
 129         pci_disable_device(pdev);
 130         pci_set_power_state(pdev, pci_choose_state(pdev, state));
 131         return ret;
 132 }
 133
 134 static int spi_resume(struct pci_dev *pdev)
 135 {
 136         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
 137         int ret;
 138
 139         pci_set_power_state(pdev, PCI_D0);
 140         pci_restore_state(pdev);
 141         ret = pci_enable_device(pdev);
 142         if (ret)
 143                 return ret;
 144         return dw_spi_resume_host(&dwpci->dws);
 145 }
 146 #else
 147 #define spi_suspend     NULL
 148 #define spi_resume      NULL
 149 #endif
 150
 151 static DEFINE_PCI_DEVICE_TABLE(pci_ids) = {
 152         /* Intel MID platform SPI controller 0 */
 153         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0800) },
 154         {},
 155 };
 156
 157 static struct pci_driver dw_spi_driver = {
 158         .name =         DRIVER_NAME,
 159         .id_table =     pci_ids,
 160         .probe =        spi_pci_probe,
 161         .remove =       spi_pci_remove,
 162         .suspend =      spi_suspend,
 163         .resume =       spi_resume,
 164 };
 165
 166 module_pci_driver(dw_spi_driver);
 167
 168 MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>");
 169 MODULE_DESCRIPTION("PCI interface driver for DW SPI Core");
 170 MODULE_LICENSE("GPL v2");