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         const struct dw_dma_platform_data *pdata = (void *)pid->driver_data;
  21         struct dw_dma_chip *chip;
  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         chip->pdata = pdata;
  53
  54         ret = dw_dma_probe(chip);
  55         if (ret)
  56                 return ret;
  57
  58         pci_set_drvdata(pdev, chip);
  59
  60         return 0;
  61 }
  62
  63 static void dw_pci_remove(struct pci_dev *pdev)
  64 {
  65         struct dw_dma_chip *chip = pci_get_drvdata(pdev);
  66         int ret;
  67
  68         ret = dw_dma_remove(chip);
  69         if (ret)
  70                 dev_warn(&pdev->dev, "can't remove device properly: %d\n", ret);
  71 }
  72
  73 #ifdef CONFIG_PM_SLEEP
  74
  75 static int dw_pci_suspend_late(struct device *dev)
  76 {
  77         struct pci_dev *pci = to_pci_dev(dev);
  78         struct dw_dma_chip *chip = pci_get_drvdata(pci);
  79
  80         return dw_dma_disable(chip);
  81 };
  82
  83 static int dw_pci_resume_early(struct device *dev)
  84 {
  85         struct pci_dev *pci = to_pci_dev(dev);
  86         struct dw_dma_chip *chip = pci_get_drvdata(pci);
  87
  88         return dw_dma_enable(chip);
  89 };
  90
  91 #endif /* CONFIG_PM_SLEEP */
  92
  93 static const struct dev_pm_ops dw_pci_dev_pm_ops = {
  94         SET_LATE_SYSTEM_SLEEP_PM_OPS(dw_pci_suspend_late, dw_pci_resume_early)
  95 };
  96
  97 static const struct pci_device_id dw_pci_id_table[] = {
  98         /* Medfield */
  99         { PCI_VDEVICE(INTEL, 0x0827) },
 100         { PCI_VDEVICE(INTEL, 0x0830) },
 101
 102         /* BayTrail */
 103         { PCI_VDEVICE(INTEL, 0x0f06) },
 104         { PCI_VDEVICE(INTEL, 0x0f40) },
 105
 106         /* Braswell */
 107         { PCI_VDEVICE(INTEL, 0x2286) },
 108         { PCI_VDEVICE(INTEL, 0x22c0) },
 109
 110         /* Haswell */
 111         { PCI_VDEVICE(INTEL, 0x9c60) },
 112
 113         /* Broadwell */
 114         { PCI_VDEVICE(INTEL, 0x9ce0) },
 115
 116         { }
 117 };
 118 MODULE_DEVICE_TABLE(pci, dw_pci_id_table);
 119
 120 static struct pci_driver dw_pci_driver = {
 121         .name           = "dw_dmac_pci",
 122         .id_table       = dw_pci_id_table,
 123         .probe          = dw_pci_probe,
 124         .remove         = dw_pci_remove,
 125         .driver = {
 126                 .pm     = &dw_pci_dev_pm_ops,
 127         },
 128 };
 129
 130 module_pci_driver(dw_pci_driver);
 131
 132 MODULE_LICENSE("GPL v2");
 133 MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller PCI driver");
 134 MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");