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 int dw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *pid)
  19 {
  20         struct dw_dma_chip *chip;
  21         struct dw_dma_platform_data *pdata = (void *)pid->driver_data;
  22         int ret;
  23
  24         ret = pcim_enable_device(pdev);
  25         if (ret)
  26                 return ret;
  27
  28         ret = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev));
  29         if (ret) {
  30                 dev_err(&pdev->dev, "I/O memory remapping failed\n");
  31                 return ret;
  32         }
  33
  34         pci_set_master(pdev);
  35         pci_try_set_mwi(pdev);
  36
  37         ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
  38         if (ret)
  39                 return ret;
  40
  41         ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
  42         if (ret)
  43                 return ret;
  44
  45         chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
  46         if (!chip)
  47                 return -ENOMEM;
  48
  49         chip->dev = &pdev->dev;
  50         chip->regs = pcim_iomap_table(pdev)[0];
  51         chip->irq = pdev->irq;
  52
  53         ret = dw_dma_probe(chip, pdata);
  54         if (ret)
  55                 return ret;
  56
  57         pci_set_drvdata(pdev, chip);
  58
  59         return 0;
  60 }
  61
  62 static void dw_pci_remove(struct pci_dev *pdev)
  63 {
  64         struct dw_dma_chip *chip = pci_get_drvdata(pdev);
  65         int ret;
  66
  67         ret = dw_dma_remove(chip);
  68         if (ret)
  69                 dev_warn(&pdev->dev, "can't remove device properly: %d\n", ret);
  70 }
  71
  72 #ifdef CONFIG_PM_SLEEP
  73
  74 static int dw_pci_suspend_late(struct device *dev)
  75 {
  76         struct pci_dev *pci = to_pci_dev(dev);
  77         struct dw_dma_chip *chip = pci_get_drvdata(pci);
  78
  79         return dw_dma_disable(chip);
  80 };
  81
  82 static int dw_pci_resume_early(struct device *dev)
  83 {
  84         struct pci_dev *pci = to_pci_dev(dev);
  85         struct dw_dma_chip *chip = pci_get_drvdata(pci);
  86
  87         return dw_dma_enable(chip);
  88 };
  89
  90 #endif /* CONFIG_PM_SLEEP */
  91
  92 static const struct dev_pm_ops dw_pci_dev_pm_ops = {
  93         SET_LATE_SYSTEM_SLEEP_PM_OPS(dw_pci_suspend_late, dw_pci_resume_early)
  94 };
  95
  96 static const struct pci_device_id dw_pci_id_table[] = {
  97         /* Medfield */
  98         { PCI_VDEVICE(INTEL, 0x0827) },
  99         { PCI_VDEVICE(INTEL, 0x0830) },
 100
 101         /* BayTrail */
 102         { PCI_VDEVICE(INTEL, 0x0f06) },
 103         { PCI_VDEVICE(INTEL, 0x0f40) },
 104
 105         /* Braswell */
 106         { PCI_VDEVICE(INTEL, 0x2286) },
 107         { PCI_VDEVICE(INTEL, 0x22c0) },
 108
 109         /* Haswell */
 110         { PCI_VDEVICE(INTEL, 0x9c60) },
 111
 112         /* Broadwell */
 113         { PCI_VDEVICE(INTEL, 0x9ce0) },
 114
 115         { }
 116 };
 117 MODULE_DEVICE_TABLE(pci, dw_pci_id_table);
 118
 119 static struct pci_driver dw_pci_driver = {
 120         .name           = "dw_dmac_pci",
 121         .id_table       = dw_pci_id_table,
 122         .probe          = dw_pci_probe,
 123         .remove         = dw_pci_remove,
 124         .driver = {
 125                 .pm     = &dw_pci_dev_pm_ops,
 126         },
 127 };
 128
 129 module_pci_driver(dw_pci_driver);
 130
 131 MODULE_LICENSE("GPL v2");
 132 MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller PCI driver");
 133 MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");