root/drivers/dma/dw/pci.c

DEFINITIONS

1. dw_pci_probe
2. dw_pci_remove
3. dw_pci_suspend_late
4. dw_pci_resume_early

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * PCI driver for the Synopsys DesignWare DMA Controller
   4  *
   5  * Copyright (C) 2013 Intel Corporation
   6  * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
   7  */
   8 
   9 #include <linux/module.h>
  10 #include <linux/pci.h>
  11 #include <linux/device.h>
  12 
  13 #include "internal.h"
  14 
  15 static int dw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *pid)
  16 {
  17         const struct dw_dma_chip_pdata *drv_data = (void *)pid->driver_data;
  18         struct dw_dma_chip_pdata *data;
  19         struct dw_dma_chip *chip;
  20         int ret;
  21 
  22         ret = pcim_enable_device(pdev);
  23         if (ret)
  24                 return ret;
  25 
  26         ret = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev));
  27         if (ret) {
  28                 dev_err(&pdev->dev, "I/O memory remapping failed\n");
  29                 return ret;
  30         }
  31 
  32         pci_set_master(pdev);
  33         pci_try_set_mwi(pdev);
  34 
  35         ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
  36         if (ret)
  37                 return ret;
  38 
  39         ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
  40         if (ret)
  41                 return ret;
  42 
  43         data = devm_kmemdup(&pdev->dev, drv_data, sizeof(*drv_data), GFP_KERNEL);
  44         if (!data)
  45                 return -ENOMEM;
  46 
  47         chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
  48         if (!chip)
  49                 return -ENOMEM;
  50 
  51         chip->dev = &pdev->dev;
  52         chip->id = pdev->devfn;
  53         chip->regs = pcim_iomap_table(pdev)[0];
  54         chip->irq = pdev->irq;
  55         chip->pdata = data->pdata;
  56 
  57         data->chip = chip;
  58 
  59         ret = data->probe(chip);
  60         if (ret)
  61                 return ret;
  62 
  63         pci_set_drvdata(pdev, data);
  64 
  65         return 0;
  66 }
  67 
  68 static void dw_pci_remove(struct pci_dev *pdev)
  69 {
  70         struct dw_dma_chip_pdata *data = pci_get_drvdata(pdev);
  71         struct dw_dma_chip *chip = data->chip;
  72         int ret;
  73 
  74         ret = data->remove(chip);
  75         if (ret)
  76                 dev_warn(&pdev->dev, "can't remove device properly: %d\n", ret);
  77 }
  78 
  79 #ifdef CONFIG_PM_SLEEP
  80 
  81 static int dw_pci_suspend_late(struct device *dev)
  82 {
  83         struct dw_dma_chip_pdata *data = dev_get_drvdata(dev);
  84         struct dw_dma_chip *chip = data->chip;
  85 
  86         return do_dw_dma_disable(chip);
  87 };
  88 
  89 static int dw_pci_resume_early(struct device *dev)
  90 {
  91         struct dw_dma_chip_pdata *data = dev_get_drvdata(dev);
  92         struct dw_dma_chip *chip = data->chip;
  93 
  94         return do_dw_dma_enable(chip);
  95 };
  96 
  97 #endif /* CONFIG_PM_SLEEP */
  98 
  99 static const struct dev_pm_ops dw_pci_dev_pm_ops = {
 100         SET_LATE_SYSTEM_SLEEP_PM_OPS(dw_pci_suspend_late, dw_pci_resume_early)
 101 };
 102 
 103 static const struct pci_device_id dw_pci_id_table[] = {
 104         /* Medfield (GPDMA) */
 105         { PCI_VDEVICE(INTEL, 0x0827), (kernel_ulong_t)&dw_dma_chip_pdata },
 106 
 107         /* BayTrail */
 108         { PCI_VDEVICE(INTEL, 0x0f06), (kernel_ulong_t)&dw_dma_chip_pdata },
 109         { PCI_VDEVICE(INTEL, 0x0f40), (kernel_ulong_t)&dw_dma_chip_pdata },
 110 
 111         /* Merrifield */
 112         { PCI_VDEVICE(INTEL, 0x11a2), (kernel_ulong_t)&idma32_chip_pdata },
 113 
 114         /* Braswell */
 115         { PCI_VDEVICE(INTEL, 0x2286), (kernel_ulong_t)&dw_dma_chip_pdata },
 116         { PCI_VDEVICE(INTEL, 0x22c0), (kernel_ulong_t)&dw_dma_chip_pdata },
 117 
 118         /* Elkhart Lake iDMA 32-bit (PSE DMA) */
 119         { PCI_VDEVICE(INTEL, 0x4bb4), (kernel_ulong_t)&idma32_chip_pdata },
 120         { PCI_VDEVICE(INTEL, 0x4bb5), (kernel_ulong_t)&idma32_chip_pdata },
 121         { PCI_VDEVICE(INTEL, 0x4bb6), (kernel_ulong_t)&idma32_chip_pdata },
 122 
 123         /* Haswell */
 124         { PCI_VDEVICE(INTEL, 0x9c60), (kernel_ulong_t)&dw_dma_chip_pdata },
 125 
 126         /* Broadwell */
 127         { PCI_VDEVICE(INTEL, 0x9ce0), (kernel_ulong_t)&dw_dma_chip_pdata },
 128 
 129         { }
 130 };
 131 MODULE_DEVICE_TABLE(pci, dw_pci_id_table);
 132 
 133 static struct pci_driver dw_pci_driver = {
 134         .name           = "dw_dmac_pci",
 135         .id_table       = dw_pci_id_table,
 136         .probe          = dw_pci_probe,
 137         .remove         = dw_pci_remove,
 138         .driver = {
 139                 .pm     = &dw_pci_dev_pm_ops,
 140         },
 141 };
 142 
 143 module_pci_driver(dw_pci_driver);
 144 
 145 MODULE_LICENSE("GPL v2");
 146 MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller PCI driver");
 147 MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");