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45051539 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1bafeb37 BP |
2 | /* |
3 | * uio_aec.c -- simple driver for Adrienne Electronics Corp time code PCI device | |
4 | * | |
5 | * Copyright (C) 2008 Brandon Philips <brandon@ifup.org> | |
1bafeb37 BP |
6 | */ |
7 | ||
8 | #include <linux/kernel.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/pci.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/interrupt.h> | |
13 | #include <linux/cdev.h> | |
14 | #include <linux/fs.h> | |
15 | #include <linux/io.h> | |
16 | #include <linux/uaccess.h> | |
17 | #include <linux/uio_driver.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
1bafeb37 BP |
19 | |
20 | #define PCI_VENDOR_ID_AEC 0xaecb | |
21 | #define PCI_DEVICE_ID_AEC_VITCLTC 0x6250 | |
22 | ||
23 | #define INT_ENABLE_ADDR 0xFC | |
24 | #define INT_ENABLE 0x10 | |
25 | #define INT_DISABLE 0x0 | |
26 | ||
27 | #define INT_MASK_ADDR 0x2E | |
28 | #define INT_MASK_ALL 0x3F | |
29 | ||
30 | #define INTA_DRVR_ADDR 0xFE | |
31 | #define INTA_ENABLED_FLAG 0x08 | |
32 | #define INTA_FLAG 0x01 | |
33 | ||
34 | #define MAILBOX 0x0F | |
35 | ||
36 | static struct pci_device_id ids[] = { | |
37 | { PCI_DEVICE(PCI_VENDOR_ID_AEC, PCI_DEVICE_ID_AEC_VITCLTC), }, | |
38 | { 0, } | |
39 | }; | |
40 | MODULE_DEVICE_TABLE(pci, ids); | |
41 | ||
42 | static irqreturn_t aectc_irq(int irq, struct uio_info *dev_info) | |
43 | { | |
44 | void __iomem *int_flag = dev_info->priv + INTA_DRVR_ADDR; | |
45 | unsigned char status = ioread8(int_flag); | |
46 | ||
47 | ||
48 | if ((status & INTA_ENABLED_FLAG) && (status & INTA_FLAG)) { | |
49 | /* application writes 0x00 to 0x2F to get next interrupt */ | |
50 | status = ioread8(dev_info->priv + MAILBOX); | |
51 | return IRQ_HANDLED; | |
52 | } | |
53 | ||
54 | return IRQ_NONE; | |
55 | } | |
56 | ||
57 | static void print_board_data(struct pci_dev *pdev, struct uio_info *i) | |
58 | { | |
59 | dev_info(&pdev->dev, "PCI-TC board vendor: %x%x number: %x%x" | |
60 | " revision: %c%c\n", | |
61 | ioread8(i->priv + 0x01), | |
62 | ioread8(i->priv + 0x00), | |
63 | ioread8(i->priv + 0x03), | |
64 | ioread8(i->priv + 0x02), | |
65 | ioread8(i->priv + 0x06), | |
66 | ioread8(i->priv + 0x07)); | |
67 | } | |
68 | ||
b17b75bb | 69 | static int probe(struct pci_dev *pdev, const struct pci_device_id *id) |
1bafeb37 BP |
70 | { |
71 | struct uio_info *info; | |
72 | int ret; | |
73 | ||
16d546c4 | 74 | info = devm_kzalloc(&pdev->dev, sizeof(struct uio_info), GFP_KERNEL); |
1bafeb37 BP |
75 | if (!info) |
76 | return -ENOMEM; | |
77 | ||
78 | if (pci_enable_device(pdev)) | |
16d546c4 | 79 | return -ENODEV; |
1bafeb37 BP |
80 | |
81 | if (pci_request_regions(pdev, "aectc")) | |
82 | goto out_disable; | |
83 | ||
84 | info->name = "aectc"; | |
85 | info->port[0].start = pci_resource_start(pdev, 0); | |
86 | if (!info->port[0].start) | |
87 | goto out_release; | |
88 | info->priv = pci_iomap(pdev, 0, 0); | |
89 | if (!info->priv) | |
90 | goto out_release; | |
91 | info->port[0].size = pci_resource_len(pdev, 0); | |
92 | info->port[0].porttype = UIO_PORT_GPIO; | |
93 | ||
94 | info->version = "0.0.1"; | |
95 | info->irq = pdev->irq; | |
96 | info->irq_flags = IRQF_SHARED; | |
97 | info->handler = aectc_irq; | |
98 | ||
99 | print_board_data(pdev, info); | |
100 | ret = uio_register_device(&pdev->dev, info); | |
101 | if (ret) | |
102 | goto out_unmap; | |
103 | ||
104 | iowrite32(INT_ENABLE, info->priv + INT_ENABLE_ADDR); | |
105 | iowrite8(INT_MASK_ALL, info->priv + INT_MASK_ADDR); | |
106 | if (!(ioread8(info->priv + INTA_DRVR_ADDR) | |
107 | & INTA_ENABLED_FLAG)) | |
108 | dev_err(&pdev->dev, "aectc: interrupts not enabled\n"); | |
109 | ||
110 | pci_set_drvdata(pdev, info); | |
111 | ||
112 | return 0; | |
113 | ||
114 | out_unmap: | |
115 | pci_iounmap(pdev, info->priv); | |
116 | out_release: | |
117 | pci_release_regions(pdev); | |
118 | out_disable: | |
119 | pci_disable_device(pdev); | |
1bafeb37 BP |
120 | return -ENODEV; |
121 | } | |
122 | ||
123 | static void remove(struct pci_dev *pdev) | |
124 | { | |
125 | struct uio_info *info = pci_get_drvdata(pdev); | |
126 | ||
127 | /* disable interrupts */ | |
128 | iowrite8(INT_DISABLE, info->priv + INT_MASK_ADDR); | |
129 | iowrite32(INT_DISABLE, info->priv + INT_ENABLE_ADDR); | |
130 | /* read mailbox to ensure board drops irq */ | |
131 | ioread8(info->priv + MAILBOX); | |
132 | ||
133 | uio_unregister_device(info); | |
134 | pci_release_regions(pdev); | |
135 | pci_disable_device(pdev); | |
dccdb2fc | 136 | pci_iounmap(pdev, info->priv); |
1bafeb37 BP |
137 | } |
138 | ||
139 | static struct pci_driver pci_driver = { | |
140 | .name = "aectc", | |
141 | .id_table = ids, | |
142 | .probe = probe, | |
143 | .remove = remove, | |
144 | }; | |
145 | ||
aa8c06f7 | 146 | module_pci_driver(pci_driver); |
1bafeb37 | 147 | MODULE_LICENSE("GPL"); |