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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); | |
34 | for (i = 0; i < chip->pdata->nr_channels; i++) { | |
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>"); |