LXR linux/drivers/dma/dw/pci.c

   1/*
   2 * PCI driver for the Synopsys DesignWare DMA Controller
   3 *
   4 * Copyright (C) 2013 Intel Corporation
   5 * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License version 2 as
   9 * published by the Free Software Foundation.
  10 */
  11
  12#include <linux/module.h>
  13#include <linux/pci.h>
  14#include <linux/device.h>
  15
  16#include "internal.h"
  17
  18static struct dw_dma_platform_data dw_pci_pdata = {
  19        .is_private = 1,
  20        .chan_allocation_order = CHAN_ALLOCATION_ASCENDING,
  21        .chan_priority = CHAN_PRIORITY_ASCENDING,
  22};
  23
  24static int dw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *pid)
  25{
  26        struct dw_dma_chip *chip;
  27        struct dw_dma_platform_data *pdata = (void *)pid->driver_data;
  28        int ret;
  29
  30        ret = pcim_enable_device(pdev);
  31        if (ret)
  32                return ret;
  33
  34        ret = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev));
  35        if (ret) {
  36                dev_err(&pdev->dev, "I/O memory remapping failed\n");
  37                return ret;
  38        }
  39
  40        pci_set_master(pdev);
  41        pci_try_set_mwi(pdev);
  42
  43        ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
  44        if (ret)
  45                return ret;
  46
  47        ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
  48        if (ret)
  49                return ret;
  50
  51        chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
  52        if (!chip)
  53                return -ENOMEM;
  54
  55        chip->dev = &pdev->dev;
  56        chip->regs = pcim_iomap_table(pdev)[0];
  57        chip->irq = pdev->irq;
  58
  59        ret = dw_dma_probe(chip, pdata);
  60        if (ret)
  61                return ret;
  62
  63        pci_set_drvdata(pdev, chip);
  64
  65        return 0;
  66}
  67
  68static void dw_pci_remove(struct pci_dev *pdev)
  69{
  70        struct dw_dma_chip *chip = pci_get_drvdata(pdev);
  71        int ret;
  72
  73        ret = dw_dma_remove(chip);
  74        if (ret)
  75                dev_warn(&pdev->dev, "can't remove device properly: %d\n", ret);
  76}
  77
  78static DEFINE_PCI_DEVICE_TABLE(dw_pci_id_table) = {
  79        /* Medfield */
  80        { PCI_VDEVICE(INTEL, 0x0827), (kernel_ulong_t)&dw_pci_pdata },
  81        { PCI_VDEVICE(INTEL, 0x0830), (kernel_ulong_t)&dw_pci_pdata },
  82
  83        /* BayTrail */
  84        { PCI_VDEVICE(INTEL, 0x0f06), (kernel_ulong_t)&dw_pci_pdata },
  85        { PCI_VDEVICE(INTEL, 0x0f40), (kernel_ulong_t)&dw_pci_pdata },
  86        { }
  87};
  88MODULE_DEVICE_TABLE(pci, dw_pci_id_table);
  89
  90static struct pci_driver dw_pci_driver = {
  91        .name           = "dw_dmac_pci",
  92        .id_table       = dw_pci_id_table,
  93        .probe          = dw_pci_probe,
  94        .remove         = dw_pci_remove,
  95};
  96
  97module_pci_driver(dw_pci_driver);
  98
  99MODULE_LICENSE("GPL v2");
 100MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller PCI driver");
 101MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
 102