projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 2b49e0c5 AS |
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 | ||
| 26 | static 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); | |
| 4c97ad99 | 34 | for (i = 0; i < chip->hsu->nr_channels; i++) { |
| 2b49e0c5 AS |
35 | if (dmaisr & 0x1) |
| 36 | ret |= hsu_dma_irq(chip, i); | |
| 37 | dmaisr >>= 1; | |
| 38 | } | |
| 39 | ||
| 40 | return ret; | |
| 41 | } | |
| 42 | ||
| 43 | static 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 | ||
| 93 | err_register_irq: | |
| 94 | hsu_dma_remove(chip); | |
| 95 | return ret; | |
| 96 | } | |
| 97 | ||
| 98 | static 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 | ||
| 106 | static const struct pci_device_id hsu_pci_id_table[] = { | |
| 107 | { PCI_VDEVICE(INTEL, 0x081e), 0 }, | |
| 594eb4a4 | 108 | { PCI_VDEVICE(INTEL, 0x1192), 0 }, |
| 2b49e0c5 AS |
109 | { } |
| 110 | }; | |
| 111 | MODULE_DEVICE_TABLE(pci, hsu_pci_id_table); | |
| 112 | ||
| 113 | static 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 | ||
| 120 | module_pci_driver(hsu_pci_driver); | |
| 121 | ||
| 122 | MODULE_LICENSE("GPL v2"); | |
| 123 | MODULE_DESCRIPTION("High Speed UART DMA PCI driver"); | |
| 124 | MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>"); |