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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; | |
c6f82787 | 30 | u32 status; |
2b49e0c5 | 31 | unsigned short i; |
d2f5a731 | 32 | int ret = 0; |
c6f82787 | 33 | int err; |
2b49e0c5 AS |
34 | |
35 | dmaisr = readl(chip->regs + HSU_PCI_DMAISR); | |
4c97ad99 | 36 | for (i = 0; i < chip->hsu->nr_channels; i++) { |
c6f82787 CKT |
37 | if (dmaisr & 0x1) { |
38 | err = hsu_dma_get_status(chip, i, &status); | |
39 | if (err > 0) | |
d2f5a731 | 40 | ret |= 1; |
c6f82787 CKT |
41 | else if (err == 0) |
42 | ret |= hsu_dma_do_irq(chip, i, status); | |
43 | } | |
2b49e0c5 AS |
44 | dmaisr >>= 1; |
45 | } | |
46 | ||
d2f5a731 | 47 | return IRQ_RETVAL(ret); |
2b49e0c5 AS |
48 | } |
49 | ||
50 | static int hsu_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) | |
51 | { | |
52 | struct hsu_dma_chip *chip; | |
53 | int ret; | |
54 | ||
55 | ret = pcim_enable_device(pdev); | |
56 | if (ret) | |
57 | return ret; | |
58 | ||
59 | ret = pcim_iomap_regions(pdev, BIT(0), pci_name(pdev)); | |
60 | if (ret) { | |
61 | dev_err(&pdev->dev, "I/O memory remapping failed\n"); | |
62 | return ret; | |
63 | } | |
64 | ||
65 | pci_set_master(pdev); | |
66 | pci_try_set_mwi(pdev); | |
67 | ||
68 | ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); | |
69 | if (ret) | |
70 | return ret; | |
71 | ||
72 | ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)); | |
73 | if (ret) | |
74 | return ret; | |
75 | ||
76 | chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL); | |
77 | if (!chip) | |
78 | return -ENOMEM; | |
79 | ||
e9bb8a9d AS |
80 | ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES); |
81 | if (ret < 0) | |
82 | return ret; | |
83 | ||
2b49e0c5 AS |
84 | chip->dev = &pdev->dev; |
85 | chip->regs = pcim_iomap_table(pdev)[0]; | |
86 | chip->length = pci_resource_len(pdev, 0); | |
87 | chip->offset = HSU_PCI_CHAN_OFFSET; | |
e9bb8a9d | 88 | chip->irq = pci_irq_vector(pdev, 0); |
2b49e0c5 AS |
89 | |
90 | ret = hsu_dma_probe(chip); | |
91 | if (ret) | |
92 | return ret; | |
93 | ||
94 | ret = request_irq(chip->irq, hsu_pci_irq, 0, "hsu_dma_pci", chip); | |
95 | if (ret) | |
96 | goto err_register_irq; | |
97 | ||
98 | pci_set_drvdata(pdev, chip); | |
99 | ||
100 | return 0; | |
101 | ||
102 | err_register_irq: | |
103 | hsu_dma_remove(chip); | |
104 | return ret; | |
105 | } | |
106 | ||
107 | static void hsu_pci_remove(struct pci_dev *pdev) | |
108 | { | |
109 | struct hsu_dma_chip *chip = pci_get_drvdata(pdev); | |
110 | ||
111 | free_irq(chip->irq, chip); | |
112 | hsu_dma_remove(chip); | |
113 | } | |
114 | ||
115 | static const struct pci_device_id hsu_pci_id_table[] = { | |
116 | { PCI_VDEVICE(INTEL, 0x081e), 0 }, | |
594eb4a4 | 117 | { PCI_VDEVICE(INTEL, 0x1192), 0 }, |
2b49e0c5 AS |
118 | { } |
119 | }; | |
120 | MODULE_DEVICE_TABLE(pci, hsu_pci_id_table); | |
121 | ||
122 | static struct pci_driver hsu_pci_driver = { | |
123 | .name = "hsu_dma_pci", | |
124 | .id_table = hsu_pci_id_table, | |
125 | .probe = hsu_pci_probe, | |
126 | .remove = hsu_pci_remove, | |
127 | }; | |
128 | ||
129 | module_pci_driver(hsu_pci_driver); | |
130 | ||
131 | MODULE_LICENSE("GPL v2"); | |
132 | MODULE_DESCRIPTION("High Speed UART DMA PCI driver"); | |
133 | MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>"); |