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#include <linux/slab.h>
31
32#define PCI_VENDOR_ID_AEC 0xaecb
33#define PCI_DEVICE_ID_AEC_VITCLTC 0x6250
34
35#define INT_ENABLE_ADDR 0xFC
36#define INT_ENABLE 0x10
37#define INT_DISABLE 0x0
38
39#define INT_MASK_ADDR 0x2E
40#define INT_MASK_ALL 0x3F
41
42#define INTA_DRVR_ADDR 0xFE
43#define INTA_ENABLED_FLAG 0x08
44#define INTA_FLAG 0x01
45
46#define MAILBOX 0x0F
47
48static struct pci_device_id ids[] = {
49 { PCI_DEVICE(PCI_VENDOR_ID_AEC, PCI_DEVICE_ID_AEC_VITCLTC), },
50 { 0, }
51};
52MODULE_DEVICE_TABLE(pci, ids);
53
54static irqreturn_t aectc_irq(int irq, struct uio_info *dev_info)
55{
56 void __iomem *int_flag = dev_info->priv + INTA_DRVR_ADDR;
57 unsigned char status = ioread8(int_flag);
58
59
60 if ((status & INTA_ENABLED_FLAG) && (status & INTA_FLAG)) {
61 /* application writes 0x00 to 0x2F to get next interrupt */
62 status = ioread8(dev_info->priv + MAILBOX);
63 return IRQ_HANDLED;
64 }
65
66 return IRQ_NONE;
67}
68
69static void print_board_data(struct pci_dev *pdev, struct uio_info *i)
70{
71 dev_info(&pdev->dev, "PCI-TC board vendor: %x%x number: %x%x"
72 " revision: %c%c\n",
73 ioread8(i->priv + 0x01),
74 ioread8(i->priv + 0x00),
75 ioread8(i->priv + 0x03),
76 ioread8(i->priv + 0x02),
77 ioread8(i->priv + 0x06),
78 ioread8(i->priv + 0x07));
79}
80
81static int probe(struct pci_dev *pdev, const struct pci_device_id *id)
82{
83 struct uio_info *info;
84 int ret;
85
86 info = kzalloc(sizeof(struct uio_info), GFP_KERNEL);
87 if (!info)
88 return -ENOMEM;
89
90 if (pci_enable_device(pdev))
91 goto out_free;
92
93 if (pci_request_regions(pdev, "aectc"))
94 goto out_disable;
95
96 info->name = "aectc";
97 info->port[0].start = pci_resource_start(pdev, 0);
98 if (!info->port[0].start)
99 goto out_release;
100 info->priv = pci_iomap(pdev, 0, 0);
101 if (!info->priv)
102 goto out_release;
103 info->port[0].size = pci_resource_len(pdev, 0);
104 info->port[0].porttype = UIO_PORT_GPIO;
105
106 info->version = "0.0.1";
107 info->irq = pdev->irq;
108 info->irq_flags = IRQF_SHARED;
109 info->handler = aectc_irq;
110
111 print_board_data(pdev, info);
112 ret = uio_register_device(&pdev->dev, info);
113 if (ret)
114 goto out_unmap;
115
116 iowrite32(INT_ENABLE, info->priv + INT_ENABLE_ADDR);
117 iowrite8(INT_MASK_ALL, info->priv + INT_MASK_ADDR);
118 if (!(ioread8(info->priv + INTA_DRVR_ADDR)
119 & INTA_ENABLED_FLAG))
120 dev_err(&pdev->dev, "aectc: interrupts not enabled\n");
121
122 pci_set_drvdata(pdev, info);
123
124 return 0;
125
126out_unmap:
127 pci_iounmap(pdev, info->priv);
128out_release:
129 pci_release_regions(pdev);
130out_disable:
131 pci_disable_device(pdev);
132out_free:
133 kfree(info);
134 return -ENODEV;
135}
136
137static void remove(struct pci_dev *pdev)
138{
139 struct uio_info *info = pci_get_drvdata(pdev);
140
141 /* disable interrupts */
142 iowrite8(INT_DISABLE, info->priv + INT_MASK_ADDR);
143 iowrite32(INT_DISABLE, info->priv + INT_ENABLE_ADDR);
144 /* read mailbox to ensure board drops irq */
145 ioread8(info->priv + MAILBOX);
146
147 uio_unregister_device(info);
148 pci_release_regions(pdev);
149 pci_disable_device(pdev);
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
162module_pci_driver(pci_driver);
163MODULE_LICENSE("GPL");
164