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1bafeb37 BP |
1 | /* |
2 | * uio_aec.c -- simple driver for Adrienne Electronics Corp time code PCI device | |
3 | * | |
4 | * Copyright (C) 2008 Brandon Philips <brandon@ifup.org> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License version 2 as published | |
8 | * by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along | |
16 | * with this program; if not, write to the Free Software Foundation, Inc., 59 | |
17 | * Temple Place, Suite 330, Boston, MA 02111-1307, USA. | |
18 | */ | |
19 | ||
20 | #include <linux/kernel.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/pci.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/cdev.h> | |
26 | #include <linux/fs.h> | |
27 | #include <linux/io.h> | |
28 | #include <linux/uaccess.h> | |
29 | #include <linux/uio_driver.h> | |
30 | ||
31 | #define PCI_VENDOR_ID_AEC 0xaecb | |
32 | #define PCI_DEVICE_ID_AEC_VITCLTC 0x6250 | |
33 | ||
34 | #define INT_ENABLE_ADDR 0xFC | |
35 | #define INT_ENABLE 0x10 | |
36 | #define INT_DISABLE 0x0 | |
37 | ||
38 | #define INT_MASK_ADDR 0x2E | |
39 | #define INT_MASK_ALL 0x3F | |
40 | ||
41 | #define INTA_DRVR_ADDR 0xFE | |
42 | #define INTA_ENABLED_FLAG 0x08 | |
43 | #define INTA_FLAG 0x01 | |
44 | ||
45 | #define MAILBOX 0x0F | |
46 | ||
47 | static struct pci_device_id ids[] = { | |
48 | { PCI_DEVICE(PCI_VENDOR_ID_AEC, PCI_DEVICE_ID_AEC_VITCLTC), }, | |
49 | { 0, } | |
50 | }; | |
51 | MODULE_DEVICE_TABLE(pci, ids); | |
52 | ||
53 | static irqreturn_t aectc_irq(int irq, struct uio_info *dev_info) | |
54 | { | |
55 | void __iomem *int_flag = dev_info->priv + INTA_DRVR_ADDR; | |
56 | unsigned char status = ioread8(int_flag); | |
57 | ||
58 | ||
59 | if ((status & INTA_ENABLED_FLAG) && (status & INTA_FLAG)) { | |
60 | /* application writes 0x00 to 0x2F to get next interrupt */ | |
61 | status = ioread8(dev_info->priv + MAILBOX); | |
62 | return IRQ_HANDLED; | |
63 | } | |
64 | ||
65 | return IRQ_NONE; | |
66 | } | |
67 | ||
68 | static void print_board_data(struct pci_dev *pdev, struct uio_info *i) | |
69 | { | |
70 | dev_info(&pdev->dev, "PCI-TC board vendor: %x%x number: %x%x" | |
71 | " revision: %c%c\n", | |
72 | ioread8(i->priv + 0x01), | |
73 | ioread8(i->priv + 0x00), | |
74 | ioread8(i->priv + 0x03), | |
75 | ioread8(i->priv + 0x02), | |
76 | ioread8(i->priv + 0x06), | |
77 | ioread8(i->priv + 0x07)); | |
78 | } | |
79 | ||
80 | static int __devinit probe(struct pci_dev *pdev, const struct pci_device_id *id) | |
81 | { | |
82 | struct uio_info *info; | |
83 | int ret; | |
84 | ||
85 | info = kzalloc(sizeof(struct uio_info), GFP_KERNEL); | |
86 | if (!info) | |
87 | return -ENOMEM; | |
88 | ||
89 | if (pci_enable_device(pdev)) | |
90 | goto out_free; | |
91 | ||
92 | if (pci_request_regions(pdev, "aectc")) | |
93 | goto out_disable; | |
94 | ||
95 | info->name = "aectc"; | |
96 | info->port[0].start = pci_resource_start(pdev, 0); | |
97 | if (!info->port[0].start) | |
98 | goto out_release; | |
99 | info->priv = pci_iomap(pdev, 0, 0); | |
100 | if (!info->priv) | |
101 | goto out_release; | |
102 | info->port[0].size = pci_resource_len(pdev, 0); | |
103 | info->port[0].porttype = UIO_PORT_GPIO; | |
104 | ||
105 | info->version = "0.0.1"; | |
106 | info->irq = pdev->irq; | |
107 | info->irq_flags = IRQF_SHARED; | |
108 | info->handler = aectc_irq; | |
109 | ||
110 | print_board_data(pdev, info); | |
111 | ret = uio_register_device(&pdev->dev, info); | |
112 | if (ret) | |
113 | goto out_unmap; | |
114 | ||
115 | iowrite32(INT_ENABLE, info->priv + INT_ENABLE_ADDR); | |
116 | iowrite8(INT_MASK_ALL, info->priv + INT_MASK_ADDR); | |
117 | if (!(ioread8(info->priv + INTA_DRVR_ADDR) | |
118 | & INTA_ENABLED_FLAG)) | |
119 | dev_err(&pdev->dev, "aectc: interrupts not enabled\n"); | |
120 | ||
121 | pci_set_drvdata(pdev, info); | |
122 | ||
123 | return 0; | |
124 | ||
125 | out_unmap: | |
126 | pci_iounmap(pdev, info->priv); | |
127 | out_release: | |
128 | pci_release_regions(pdev); | |
129 | out_disable: | |
130 | pci_disable_device(pdev); | |
131 | out_free: | |
132 | kfree(info); | |
133 | return -ENODEV; | |
134 | } | |
135 | ||
136 | static void remove(struct pci_dev *pdev) | |
137 | { | |
138 | struct uio_info *info = pci_get_drvdata(pdev); | |
139 | ||
140 | /* disable interrupts */ | |
141 | iowrite8(INT_DISABLE, info->priv + INT_MASK_ADDR); | |
142 | iowrite32(INT_DISABLE, info->priv + INT_ENABLE_ADDR); | |
143 | /* read mailbox to ensure board drops irq */ | |
144 | ioread8(info->priv + MAILBOX); | |
145 | ||
146 | uio_unregister_device(info); | |
147 | pci_release_regions(pdev); | |
148 | pci_disable_device(pdev); | |
149 | pci_set_drvdata(pdev, NULL); | |
150 | iounmap(info->priv); | |
151 | ||
152 | kfree(info); | |
153 | } | |
154 | ||
155 | static struct pci_driver pci_driver = { | |
156 | .name = "aectc", | |
157 | .id_table = ids, | |
158 | .probe = probe, | |
159 | .remove = remove, | |
160 | }; | |
161 | ||
162 | static int __init aectc_init(void) | |
163 | { | |
164 | return pci_register_driver(&pci_driver); | |
165 | } | |
166 | ||
167 | static void __exit aectc_exit(void) | |
168 | { | |
169 | pci_unregister_driver(&pci_driver); | |
170 | } | |
171 | ||
172 | MODULE_LICENSE("GPL"); | |
173 | ||
174 | module_init(aectc_init); | |
175 | module_exit(aectc_exit); |