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
  18 static 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
  24 static 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
  68 static 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
  78 static 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 };
  88 MODULE_DEVICE_TABLE(pci, dw_pci_id_table);
  89
  90 static 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
  97 module_pci_driver(dw_pci_driver);
  98
  99 MODULE_LICENSE("GPL v2");
 100 MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller PCI driver");
 101 MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");