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 #ifdef CONFIG_PM_SLEEP
  79
  80 static int dw_pci_suspend_late(struct device *dev)
  81 {
  82         struct pci_dev *pci = to_pci_dev(dev);
  83         struct dw_dma_chip *chip = pci_get_drvdata(pci);
  84
  85         return dw_dma_disable(chip);
  86 };
  87
  88 static int dw_pci_resume_early(struct device *dev)
  89 {
  90         struct pci_dev *pci = to_pci_dev(dev);
  91         struct dw_dma_chip *chip = pci_get_drvdata(pci);
  92
  93         return dw_dma_enable(chip);
  94 };
  95
  96 #endif /* CONFIG_PM_SLEEP */
  97
  98 static const struct dev_pm_ops dw_pci_dev_pm_ops = {
  99         SET_LATE_SYSTEM_SLEEP_PM_OPS(dw_pci_suspend_late, dw_pci_resume_early)
 100 };
 101
 102 static const struct pci_device_id dw_pci_id_table[] = {
 103         /* Medfield */
 104         { PCI_VDEVICE(INTEL, 0x0827), (kernel_ulong_t)&dw_pci_pdata },
 105         { PCI_VDEVICE(INTEL, 0x0830), (kernel_ulong_t)&dw_pci_pdata },
 106
 107         /* BayTrail */
 108         { PCI_VDEVICE(INTEL, 0x0f06), (kernel_ulong_t)&dw_pci_pdata },
 109         { PCI_VDEVICE(INTEL, 0x0f40), (kernel_ulong_t)&dw_pci_pdata },
 110
 111         /* Braswell */
 112         { PCI_VDEVICE(INTEL, 0x2286), (kernel_ulong_t)&dw_pci_pdata },
 113         { PCI_VDEVICE(INTEL, 0x22c0), (kernel_ulong_t)&dw_pci_pdata },
 114
 115         /* Haswell */
 116         { PCI_VDEVICE(INTEL, 0x9c60), (kernel_ulong_t)&dw_pci_pdata },
 117         { }
 118 };
 119 MODULE_DEVICE_TABLE(pci, dw_pci_id_table);
 120
 121 static struct pci_driver dw_pci_driver = {
 122         .name           = "dw_dmac_pci",
 123         .id_table       = dw_pci_id_table,
 124         .probe          = dw_pci_probe,
 125         .remove         = dw_pci_remove,
 126         .driver = {
 127                 .pm     = &dw_pci_dev_pm_ops,
 128         },
 129 };
 130
 131 module_pci_driver(dw_pci_driver);
 132
 133 MODULE_LICENSE("GPL v2");
 134 MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller PCI driver");
 135 MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");