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         printk(KERN_INFO "DW: 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         pci_set_drvdata(pdev, NULL);
 113         dw_spi_remove_host(&dwpci->dws);
 114         iounmap(dwpci->dws.regs);
 115         pci_release_region(pdev, 0);
 116         kfree(dwpci);
 117         pci_disable_device(pdev);
 118 }
 119
 120 #ifdef CONFIG_PM
 121 static int spi_suspend(struct pci_dev *pdev, pm_message_t state)
 122 {
 123         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
 124         int ret;
 125
 126         ret = dw_spi_suspend_host(&dwpci->dws);
 127         if (ret)
 128                 return ret;
 129         pci_save_state(pdev);
 130         pci_disable_device(pdev);
 131         pci_set_power_state(pdev, pci_choose_state(pdev, state));
 132         return ret;
 133 }
 134
 135 static int spi_resume(struct pci_dev *pdev)
 136 {
 137         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
 138         int ret;
 139
 140         pci_set_power_state(pdev, PCI_D0);
 141         pci_restore_state(pdev);
 142         ret = pci_enable_device(pdev);
 143         if (ret)
 144                 return ret;
 145         return dw_spi_resume_host(&dwpci->dws);
 146 }
 147 #else
 148 #define spi_suspend     NULL
 149 #define spi_resume      NULL
 150 #endif
 151
 152 static DEFINE_PCI_DEVICE_TABLE(pci_ids) = {
 153         /* Intel MID platform SPI controller 0 */
 154         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0800) },
 155         {},
 156 };
 157
 158 static struct pci_driver dw_spi_driver = {
 159         .name =         DRIVER_NAME,
 160         .id_table =     pci_ids,
 161         .probe =        spi_pci_probe,
 162         .remove =       spi_pci_remove,
 163         .suspend =      spi_suspend,
 164         .resume =       spi_resume,
 165 };
 166
 167 module_pci_driver(dw_spi_driver);
 168
 169 MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>");
 170 MODULE_DESCRIPTION("PCI interface driver for DW SPI Core");
 171 MODULE_LICENSE("GPL v2");