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 = pcim_enable_device(pdev);
  47         if (ret)
  48                 return ret;
  49
  50         dwpci = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_pci),
  51                         GFP_KERNEL);
  52         if (!dwpci)
  53                 return -ENOMEM;
  54
  55         dwpci->pdev = pdev;
  56         dws = &dwpci->dws;
  57
  58         /* Get basic io resource and map it */
  59         dws->paddr = pci_resource_start(pdev, pci_bar);
  60
  61         ret = pcim_iomap_regions(pdev, 1, dev_name(&pdev->dev));
  62         if (ret)
  63                 return ret;
  64
  65         dws->bus_num = 0;
  66         dws->num_cs = 4;
  67         dws->irq = pdev->irq;
  68
  69         /*
  70          * Specific handling for Intel MID paltforms, like dma setup,
  71          * clock rate, FIFO depth.
  72          */
  73         if (pdev->device == 0x0800) {
  74                 ret = dw_spi_mid_init(dws);
  75                 if (ret)
  76                         return ret;
  77         }
  78
  79         ret = dw_spi_add_host(&pdev->dev, dws);
  80         if (ret)
  81                 return ret;
  82
  83         /* PCI hook and SPI hook use the same drv data */
  84         pci_set_drvdata(pdev, dwpci);
  85
  86         return 0;
  87 }
  88
  89 static void spi_pci_remove(struct pci_dev *pdev)
  90 {
  91         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
  92
  93         dw_spi_remove_host(&dwpci->dws);
  94 }
  95
  96 #ifdef CONFIG_PM
  97 static int spi_suspend(struct pci_dev *pdev, pm_message_t state)
  98 {
  99         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
 100         int ret;
 101
 102         ret = dw_spi_suspend_host(&dwpci->dws);
 103         if (ret)
 104                 return ret;
 105         pci_save_state(pdev);
 106         pci_disable_device(pdev);
 107         pci_set_power_state(pdev, pci_choose_state(pdev, state));
 108         return ret;
 109 }
 110
 111 static int spi_resume(struct pci_dev *pdev)
 112 {
 113         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
 114         int ret;
 115
 116         pci_set_power_state(pdev, PCI_D0);
 117         pci_restore_state(pdev);
 118         ret = pci_enable_device(pdev);
 119         if (ret)
 120                 return ret;
 121         return dw_spi_resume_host(&dwpci->dws);
 122 }
 123 #else
 124 #define spi_suspend     NULL
 125 #define spi_resume      NULL
 126 #endif
 127
 128 static const struct pci_device_id pci_ids[] = {
 129         /* Intel MID platform SPI controller 0 */
 130         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0800) },
 131         {},
 132 };
 133
 134 static struct pci_driver dw_spi_driver = {
 135         .name =         DRIVER_NAME,
 136         .id_table =     pci_ids,
 137         .probe =        spi_pci_probe,
 138         .remove =       spi_pci_remove,
 139         .suspend =      spi_suspend,
 140         .resume =       spi_resume,
 141 };
 142
 143 module_pci_driver(dw_spi_driver);
 144
 145 MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>");
 146 MODULE_DESCRIPTION("PCI interface driver for DW SPI Core");
 147 MODULE_LICENSE("GPL v2");