2 * PCI driver for the High Speed UART DMA
4 * Copyright (C) 2015 Intel Corporation
5 * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
7 * Partially based on the bits found in drivers/tty/serial/mfd.c.
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.
14 #include <linux/bitops.h>
15 #include <linux/device.h>
16 #include <linux/module.h>
17 #include <linux/pci.h>
21 #define HSU_PCI_DMASR 0x00
22 #define HSU_PCI_DMAISR 0x04
24 #define HSU_PCI_CHAN_OFFSET 0x100
26 static irqreturn_t hsu_pci_irq(int irq, void *dev)
28 struct hsu_dma_chip *chip = dev;
35 dmaisr = readl(chip->regs + HSU_PCI_DMAISR);
36 for (i = 0; i < chip->hsu->nr_channels; i++) {
38 err = hsu_dma_get_status(chip, i, &status);
42 ret |= hsu_dma_do_irq(chip, i, status);
47 return IRQ_RETVAL(ret);
50 static int hsu_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
52 struct hsu_dma_chip *chip;
55 ret = pcim_enable_device(pdev);
59 ret = pcim_iomap_regions(pdev, BIT(0), pci_name(pdev));
61 dev_err(&pdev->dev, "I/O memory remapping failed\n");
66 pci_try_set_mwi(pdev);
68 ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
72 ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
76 chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
80 chip->dev = &pdev->dev;
81 chip->regs = pcim_iomap_table(pdev)[0];
82 chip->length = pci_resource_len(pdev, 0);
83 chip->offset = HSU_PCI_CHAN_OFFSET;
84 chip->irq = pdev->irq;
88 ret = hsu_dma_probe(chip);
92 ret = request_irq(chip->irq, hsu_pci_irq, 0, "hsu_dma_pci", chip);
94 goto err_register_irq;
96 pci_set_drvdata(pdev, chip);
101 hsu_dma_remove(chip);
105 static void hsu_pci_remove(struct pci_dev *pdev)
107 struct hsu_dma_chip *chip = pci_get_drvdata(pdev);
109 free_irq(chip->irq, chip);
110 hsu_dma_remove(chip);
113 static const struct pci_device_id hsu_pci_id_table[] = {
114 { PCI_VDEVICE(INTEL, 0x081e), 0 },
115 { PCI_VDEVICE(INTEL, 0x1192), 0 },
118 MODULE_DEVICE_TABLE(pci, hsu_pci_id_table);
120 static struct pci_driver hsu_pci_driver = {
121 .name = "hsu_dma_pci",
122 .id_table = hsu_pci_id_table,
123 .probe = hsu_pci_probe,
124 .remove = hsu_pci_remove,
127 module_pci_driver(hsu_pci_driver);
129 MODULE_LICENSE("GPL v2");
130 MODULE_DESCRIPTION("High Speed UART DMA PCI driver");
131 MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");