LXR linux/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
  26struct spi_pci_desc {
  27        int     (*setup)(struct dw_spi *);
  28        u16     num_cs;
  29        u16     bus_num;
  30};
  31
  32static 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
  38static 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
  44static 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 paltforms, 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
  99static 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
 107static 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
 115static 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
 124static SIMPLE_DEV_PM_OPS(dw_spi_pm_ops, spi_suspend, spi_resume);
 125
 126static 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
 139static 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
 149module_pci_driver(dw_spi_driver);
 150
 151MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>");
 152MODULE_DESCRIPTION("PCI interface driver for DW SPI Core");
 153MODULE_LICENSE("GPL v2");
 154