blob: b7830e9a3baabf1373ab8c62fcdc8602d0faf0aa [file] [log] [blame]
Brandon Philips1bafeb32009-01-27 13:00:04 -08001/*
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
47static struct pci_device_id ids[] = {
48 { PCI_DEVICE(PCI_VENDOR_ID_AEC, PCI_DEVICE_ID_AEC_VITCLTC), },
49 { 0, }
50};
51MODULE_DEVICE_TABLE(pci, ids);
52
53static 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
68static 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
80static 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
125out_unmap:
126 pci_iounmap(pdev, info->priv);
127out_release:
128 pci_release_regions(pdev);
129out_disable:
130 pci_disable_device(pdev);
131out_free:
132 kfree(info);
133 return -ENODEV;
134}
135
136static 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
155static struct pci_driver pci_driver = {
156 .name = "aectc",
157 .id_table = ids,
158 .probe = probe,
159 .remove = remove,
160};
161
162static int __init aectc_init(void)
163{
164 return pci_register_driver(&pci_driver);
165}
166
167static void __exit aectc_exit(void)
168{
169 pci_unregister_driver(&pci_driver);
170}
171
172MODULE_LICENSE("GPL");
173
174module_init(aectc_init);
175module_exit(aectc_exit);