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 mrfld_pdata = {
  19         .nr_channels = 8,
  20         .is_private = true,
  21         .is_memcpy = true,
  22         .is_idma32 = true,
  23         .chan_allocation_order = CHAN_ALLOCATION_ASCENDING,
  24         .chan_priority = CHAN_PRIORITY_ASCENDING,
  25         .block_size = 131071,
  26         .nr_masters = 1,
  27         .data_width = {4},
  28 };
  29
  30 static int dw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *pid)
  31 {
  32         const struct dw_dma_platform_data *pdata = (void *)pid->driver_data;
  33         struct dw_dma_chip *chip;
  34         int ret;
  35
  36         ret = pcim_enable_device(pdev);
  37         if (ret)
  38                 return ret;
  39
  40         ret = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev));
  41         if (ret) {
  42                 dev_err(&pdev->dev, "I/O memory remapping failed\n");
  43                 return ret;
  44         }
  45
  46         pci_set_master(pdev);
  47         pci_try_set_mwi(pdev);
  48
  49         ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
  50         if (ret)
  51                 return ret;
  52
  53         ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
  54         if (ret)
  55                 return ret;
  56
  57         chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
  58         if (!chip)
  59                 return -ENOMEM;
  60
  61         chip->dev = &pdev->dev;
  62         chip->id = pdev->devfn;
  63         chip->regs = pcim_iomap_table(pdev)[0];
  64         chip->irq = pdev->irq;
  65         chip->pdata = pdata;
  66
  67         ret = dw_dma_probe(chip);
  68         if (ret)
  69                 return ret;
  70
  71         pci_set_drvdata(pdev, chip);
  72
  73         return 0;
  74 }
  75
  76 static void dw_pci_remove(struct pci_dev *pdev)
  77 {
  78         struct dw_dma_chip *chip = pci_get_drvdata(pdev);
  79         int ret;
  80
  81         ret = dw_dma_remove(chip);
  82         if (ret)
  83                 dev_warn(&pdev->dev, "can't remove device properly: %d\n", ret);
  84 }
  85
  86 #ifdef CONFIG_PM_SLEEP
  87
  88 static int dw_pci_suspend_late(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_disable(chip);
  94 };
  95
  96 static int dw_pci_resume_early(struct device *dev)
  97 {
  98         struct pci_dev *pci = to_pci_dev(dev);
  99         struct dw_dma_chip *chip = pci_get_drvdata(pci);
 100
 101         return dw_dma_enable(chip);
 102 };
 103
 104 #endif /* CONFIG_PM_SLEEP */
 105
 106 static const struct dev_pm_ops dw_pci_dev_pm_ops = {
 107         SET_LATE_SYSTEM_SLEEP_PM_OPS(dw_pci_suspend_late, dw_pci_resume_early)
 108 };
 109
 110 static const struct pci_device_id dw_pci_id_table[] = {
 111         /* Medfield (GPDMA) */
 112         { PCI_VDEVICE(INTEL, 0x0827) },
 113
 114         /* BayTrail */
 115         { PCI_VDEVICE(INTEL, 0x0f06) },
 116         { PCI_VDEVICE(INTEL, 0x0f40) },
 117
 118         /* Merrifield iDMA 32-bit (GPDMA) */
 119         { PCI_VDEVICE(INTEL, 0x11a2), (kernel_ulong_t)&mrfld_pdata },
 120
 121         /* Braswell */
 122         { PCI_VDEVICE(INTEL, 0x2286) },
 123         { PCI_VDEVICE(INTEL, 0x22c0) },
 124
 125         /* Haswell */
 126         { PCI_VDEVICE(INTEL, 0x9c60) },
 127
 128         /* Broadwell */
 129         { PCI_VDEVICE(INTEL, 0x9ce0) },
 130
 131         { }
 132 };
 133 MODULE_DEVICE_TABLE(pci, dw_pci_id_table);
 134
 135 static struct pci_driver dw_pci_driver = {
 136         .name           = "dw_dmac_pci",
 137         .id_table       = dw_pci_id_table,
 138         .probe          = dw_pci_probe,
 139         .remove         = dw_pci_remove,
 140         .driver = {
 141                 .pm     = &dw_pci_dev_pm_ops,
 142         },
 143 };
 144
 145 module_pci_driver(dw_pci_driver);
 146
 147 MODULE_LICENSE("GPL v2");
 148 MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller PCI driver");
 149 MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");