drivers/spi/spi-dw-pci.c

   1 /*
   2  * PCI interface driver for DW SPI Core
   3  *
   4  * Copyright (c) 2009, 2014 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
  16 #include <linux/interrupt.h>
  17 #include <linux/pci.h>
  18 #include <linux/slab.h>
  19 #include <linux/spi/spi.h>
  20 #include <linux/module.h>
  21
  22 #include "spi-dw.h"
  23
  24 #define DRIVER_NAME "dw_spi_pci"
  25
  26 struct dw_spi_pci {
  27         struct pci_dev  *pdev;
  28         struct dw_spi   dws;
  29 };
  30
  31 struct spi_pci_desc {
  32         int     (*setup)(struct dw_spi *);
  33 };
  34
  35 static struct spi_pci_desc spi_pci_mid_desc = {
  36         .setup = dw_spi_mid_init,
  37 };
  38
  39 static int spi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
  40 {
  41         struct dw_spi_pci *dwpci;
  42         struct dw_spi *dws;
  43         struct spi_pci_desc *desc = (struct spi_pci_desc *)ent->driver_data;
  44         int pci_bar = 0;
  45         int ret;
  46
  47         ret = pcim_enable_device(pdev);
  48         if (ret)
  49                 return ret;
  50
  51         dwpci = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_pci),
  52                         GFP_KERNEL);
  53         if (!dwpci)
  54                 return -ENOMEM;
  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
  62         ret = pcim_iomap_regions(pdev, 1 << pci_bar, pci_name(pdev));
  63         if (ret)
  64                 return ret;
  65
  66         dws->regs = pcim_iomap_table(pdev)[pci_bar];
  67
  68         dws->bus_num = 0;
  69         dws->num_cs = 4;
  70         dws->irq = pdev->irq;
  71
  72         /*
  73          * Specific handling for paltforms, like dma setup,
  74          * clock rate, FIFO depth.
  75          */
  76         if (desc && desc->setup) {
  77                 ret = desc->setup(dws);
  78                 if (ret)
  79                         return ret;
  80         }
  81
  82         ret = dw_spi_add_host(&pdev->dev, dws);
  83         if (ret)
  84                 return ret;
  85
  86         /* PCI hook and SPI hook use the same drv data */
  87         pci_set_drvdata(pdev, dwpci);
  88
  89         dev_info(&pdev->dev, "found PCI SPI controller(ID: %04x:%04x)\n",
  90                 pdev->vendor, pdev->device);
  91
  92         return 0;
  93 }
  94
  95 static void spi_pci_remove(struct pci_dev *pdev)
  96 {
  97         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
  98
  99         dw_spi_remove_host(&dwpci->dws);
 100 }
 101
 102 #ifdef CONFIG_PM_SLEEP
 103 static int spi_suspend(struct device *dev)
 104 {
 105         struct pci_dev *pdev = to_pci_dev(dev);
 106         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
 107
 108         return dw_spi_suspend_host(&dwpci->dws);
 109 }
 110
 111 static int spi_resume(struct device *dev)
 112 {
 113         struct pci_dev *pdev = to_pci_dev(dev);
 114         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
 115
 116         return dw_spi_resume_host(&dwpci->dws);
 117 }
 118 #endif
 119
 120 static SIMPLE_DEV_PM_OPS(dw_spi_pm_ops, spi_suspend, spi_resume);
 121
 122 static const struct pci_device_id pci_ids[] = {
 123         /* Intel MID platform SPI controller 0 */
 124         { PCI_VDEVICE(INTEL, 0x0800), (kernel_ulong_t)&spi_pci_mid_desc},
 125         {},
 126 };
 127
 128 static struct pci_driver dw_spi_driver = {
 129         .name =         DRIVER_NAME,
 130         .id_table =     pci_ids,
 131         .probe =        spi_pci_probe,
 132         .remove =       spi_pci_remove,
 133         .driver         = {
 134                 .pm     = &dw_spi_pm_ops,
 135         },
 136 };
 137
 138 module_pci_driver(dw_spi_driver);
 139
 140 MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>");
 141 MODULE_DESCRIPTION("PCI interface driver for DW SPI Core");
 142 MODULE_LICENSE("GPL v2");