LXR linux/drivers/dma/hsu/pci.c

   1/*
   2 * PCI driver for the High Speed UART DMA
   3 *
   4 * Copyright (C) 2015 Intel Corporation
   5 * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
   6 *
   7 * Partially based on the bits found in drivers/tty/serial/mfd.c.
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License version 2 as
  11 * published by the Free Software Foundation.
  12 */
  13
  14#include <linux/bitops.h>
  15#include <linux/device.h>
  16#include <linux/module.h>
  17#include <linux/pci.h>
  18
  19#include "hsu.h"
  20
  21#define HSU_PCI_DMASR           0x00
  22#define HSU_PCI_DMAISR          0x04
  23
  24#define HSU_PCI_CHAN_OFFSET     0x100
  25
  26static irqreturn_t hsu_pci_irq(int irq, void *dev)
  27{
  28        struct hsu_dma_chip *chip = dev;
  29        u32 dmaisr;
  30        unsigned short i;
  31        irqreturn_t ret = IRQ_NONE;
  32
  33        dmaisr = readl(chip->regs + HSU_PCI_DMAISR);
  34        for (i = 0; i < chip->hsu->nr_channels; i++) {
  35                if (dmaisr & 0x1)
  36                        ret |= hsu_dma_irq(chip, i);
  37                dmaisr >>= 1;
  38        }
  39
  40        return ret;
  41}
  42
  43static int hsu_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
  44{
  45        struct hsu_dma_chip *chip;
  46        int ret;
  47
  48        ret = pcim_enable_device(pdev);
  49        if (ret)
  50                return ret;
  51
  52        ret = pcim_iomap_regions(pdev, BIT(0), pci_name(pdev));
  53        if (ret) {
  54                dev_err(&pdev->dev, "I/O memory remapping failed\n");
  55                return ret;
  56        }
  57
  58        pci_set_master(pdev);
  59        pci_try_set_mwi(pdev);
  60
  61        ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
  62        if (ret)
  63                return ret;
  64
  65        ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
  66        if (ret)
  67                return ret;
  68
  69        chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
  70        if (!chip)
  71                return -ENOMEM;
  72
  73        chip->dev = &pdev->dev;
  74        chip->regs = pcim_iomap_table(pdev)[0];
  75        chip->length = pci_resource_len(pdev, 0);
  76        chip->offset = HSU_PCI_CHAN_OFFSET;
  77        chip->irq = pdev->irq;
  78
  79        pci_enable_msi(pdev);
  80
  81        ret = hsu_dma_probe(chip);
  82        if (ret)
  83                return ret;
  84
  85        ret = request_irq(chip->irq, hsu_pci_irq, 0, "hsu_dma_pci", chip);
  86        if (ret)
  87                goto err_register_irq;
  88
  89        pci_set_drvdata(pdev, chip);
  90
  91        return 0;
  92
  93err_register_irq:
  94        hsu_dma_remove(chip);
  95        return ret;
  96}
  97
  98static void hsu_pci_remove(struct pci_dev *pdev)
  99{
 100        struct hsu_dma_chip *chip = pci_get_drvdata(pdev);
 101
 102        free_irq(chip->irq, chip);
 103        hsu_dma_remove(chip);
 104}
 105
 106static const struct pci_device_id hsu_pci_id_table[] = {
 107        { PCI_VDEVICE(INTEL, 0x081e), 0 },
 108        { PCI_VDEVICE(INTEL, 0x1192), 0 },
 109        { }
 110};
 111MODULE_DEVICE_TABLE(pci, hsu_pci_id_table);
 112
 113static struct pci_driver hsu_pci_driver = {
 114        .name           = "hsu_dma_pci",
 115        .id_table       = hsu_pci_id_table,
 116        .probe          = hsu_pci_probe,
 117        .remove         = hsu_pci_remove,
 118};
 119
 120module_pci_driver(hsu_pci_driver);
 121
 122MODULE_LICENSE("GPL v2");
 123MODULE_DESCRIPTION("High Speed UART DMA PCI driver");
 124MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
 125