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 spi_pci_desc {
  27         int     (*setup)(struct dw_spi *);
  28         u16     num_cs;
  29         u16     bus_num;
  30 };
  31
  32 static struct spi_pci_desc spi_pci_mid_desc_1 = {
  33         .setup = dw_spi_mid_init,
  34         .num_cs = 5,
  35         .bus_num = 0,
  36 };
  37
  38 static struct spi_pci_desc spi_pci_mid_desc_2 = {
  39         .setup = dw_spi_mid_init,
  40         .num_cs = 2,
  41         .bus_num = 1,
  42 };
  43
  44 static int spi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
  45 {
  46         struct dw_spi *dws;
  47         struct spi_pci_desc *desc = (struct spi_pci_desc *)ent->driver_data;
  48         int pci_bar = 0;
  49         int ret;
  50
  51         ret = pcim_enable_device(pdev);
  52         if (ret)
  53                 return ret;
  54
  55         dws = devm_kzalloc(&pdev->dev, sizeof(*dws), GFP_KERNEL);
  56         if (!dws)
  57                 return -ENOMEM;
  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         dws->irq = pdev->irq;
  68
  69         /*
  70          * Specific handling for platforms, like dma setup,
  71          * clock rate, FIFO depth.
  72          */
  73         if (desc) {
  74                 dws->num_cs = desc->num_cs;
  75                 dws->bus_num = desc->bus_num;
  76
  77                 if (desc->setup) {
  78                         ret = desc->setup(dws);
  79                         if (ret)
  80                                 return ret;
  81                 }
  82         } else {
  83                 return -ENODEV;
  84         }
  85
  86         ret = dw_spi_add_host(&pdev->dev, dws);
  87         if (ret)
  88                 return ret;
  89
  90         /* PCI hook and SPI hook use the same drv data */
  91         pci_set_drvdata(pdev, dws);
  92
  93         dev_info(&pdev->dev, "found PCI SPI controller(ID: %04x:%04x)\n",
  94                 pdev->vendor, pdev->device);
  95
  96         return 0;
  97 }
  98
  99 static void spi_pci_remove(struct pci_dev *pdev)
 100 {
 101         struct dw_spi *dws = pci_get_drvdata(pdev);
 102
 103         dw_spi_remove_host(dws);
 104 }
 105
 106 #ifdef CONFIG_PM_SLEEP
 107 static int spi_suspend(struct device *dev)
 108 {
 109         struct pci_dev *pdev = to_pci_dev(dev);
 110         struct dw_spi *dws = pci_get_drvdata(pdev);
 111
 112         return dw_spi_suspend_host(dws);
 113 }
 114
 115 static int spi_resume(struct device *dev)
 116 {
 117         struct pci_dev *pdev = to_pci_dev(dev);
 118         struct dw_spi *dws = pci_get_drvdata(pdev);
 119
 120         return dw_spi_resume_host(dws);
 121 }
 122 #endif
 123
 124 static SIMPLE_DEV_PM_OPS(dw_spi_pm_ops, spi_suspend, spi_resume);
 125
 126 static const struct pci_device_id pci_ids[] = {
 127         /* Intel MID platform SPI controller 0 */
 128         /*
 129          * The access to the device 8086:0801 is disabled by HW, since it's
 130          * exclusively used by SCU to communicate with MSIC.
 131          */
 132         /* Intel MID platform SPI controller 1 */
 133         { PCI_VDEVICE(INTEL, 0x0800), (kernel_ulong_t)&spi_pci_mid_desc_1},
 134         /* Intel MID platform SPI controller 2 */
 135         { PCI_VDEVICE(INTEL, 0x0812), (kernel_ulong_t)&spi_pci_mid_desc_2},
 136         {},
 137 };
 138
 139 static struct pci_driver dw_spi_driver = {
 140         .name =         DRIVER_NAME,
 141         .id_table =     pci_ids,
 142         .probe =        spi_pci_probe,
 143         .remove =       spi_pci_remove,
 144         .driver         = {
 145                 .pm     = &dw_spi_pm_ops,
 146         },
 147 };
 148
 149 module_pci_driver(dw_spi_driver);
 150
 151 MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>");
 152 MODULE_DESCRIPTION("PCI interface driver for DW SPI Core");
 153 MODULE_LICENSE("GPL v2");