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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Driver for TANBAC TB0219 base board.
3 *
Ralf Baechle29ce2c72005-12-12 20:11:50 +00004 * Copyright (C) 2005 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
Russell Kingd052d1b2005-10-29 19:07:23 +010020#include <linux/platform_device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <linux/fs.h>
22#include <linux/init.h>
23#include <linux/module.h>
24
25#include <asm/io.h>
26#include <asm/reboot.h>
Yoichi Yuasa6e498c12005-07-12 13:58:32 -070027#include <asm/vr41xx/giu.h>
28#include <asm/vr41xx/tb0219.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Ralf Baechle29ce2c72005-12-12 20:11:50 +000030MODULE_AUTHOR("Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>");
Linus Torvalds1da177e2005-04-16 15:20:36 -070031MODULE_DESCRIPTION("TANBAC TB0219 base board driver");
32MODULE_LICENSE("GPL");
33
34static int major; /* default is dynamic major device number */
35module_param(major, int, 0);
36MODULE_PARM_DESC(major, "Major device number");
37
38static void (*old_machine_restart)(char *command);
39static void __iomem *tb0219_base;
40static spinlock_t tb0219_lock;
41
42#define tb0219_read(offset) readw(tb0219_base + (offset))
43#define tb0219_write(offset, value) writew((value), tb0219_base + (offset))
44
45#define TB0219_START 0x0a000000UL
46#define TB0219_SIZE 0x20UL
47
48#define TB0219_LED 0x00
49#define TB0219_GPIO_INPUT 0x02
50#define TB0219_GPIO_OUTPUT 0x04
51#define TB0219_DIP_SWITCH 0x06
52#define TB0219_MISC 0x08
53#define TB0219_RESET 0x0e
54#define TB0219_PCI_SLOT1_IRQ_STATUS 0x10
55#define TB0219_PCI_SLOT2_IRQ_STATUS 0x12
56#define TB0219_PCI_SLOT3_IRQ_STATUS 0x14
57
58typedef enum {
59 TYPE_LED,
60 TYPE_GPIO_OUTPUT,
61} tb0219_type_t;
62
63/*
64 * Minor device number
65 * 0 = 7 segment LED
66 *
67 * 16 = GPIO IN 0
68 * 17 = GPIO IN 1
69 * 18 = GPIO IN 2
70 * 19 = GPIO IN 3
71 * 20 = GPIO IN 4
72 * 21 = GPIO IN 5
73 * 22 = GPIO IN 6
74 * 23 = GPIO IN 7
75 *
76 * 32 = GPIO OUT 0
77 * 33 = GPIO OUT 1
78 * 34 = GPIO OUT 2
79 * 35 = GPIO OUT 3
80 * 36 = GPIO OUT 4
81 * 37 = GPIO OUT 5
82 * 38 = GPIO OUT 6
83 * 39 = GPIO OUT 7
84 *
85 * 48 = DIP switch 1
86 * 49 = DIP switch 2
87 * 50 = DIP switch 3
88 * 51 = DIP switch 4
89 * 52 = DIP switch 5
90 * 53 = DIP switch 6
91 * 54 = DIP switch 7
92 * 55 = DIP switch 8
93 */
94
95static inline char get_led(void)
96{
97 return (char)tb0219_read(TB0219_LED);
98}
99
100static inline char get_gpio_input_pin(unsigned int pin)
101{
102 uint16_t values;
103
104 values = tb0219_read(TB0219_GPIO_INPUT);
105 if (values & (1 << pin))
106 return '1';
107
108 return '0';
109}
110
111static inline char get_gpio_output_pin(unsigned int pin)
112{
113 uint16_t values;
114
115 values = tb0219_read(TB0219_GPIO_OUTPUT);
116 if (values & (1 << pin))
117 return '1';
118
119 return '0';
120}
121
122static inline char get_dip_switch(unsigned int pin)
123{
124 uint16_t values;
125
126 values = tb0219_read(TB0219_DIP_SWITCH);
127 if (values & (1 << pin))
128 return '1';
129
130 return '0';
131}
132
133static inline int set_led(char command)
134{
135 tb0219_write(TB0219_LED, command);
136
137 return 0;
138}
139
140static inline int set_gpio_output_pin(unsigned int pin, char command)
141{
142 unsigned long flags;
143 uint16_t value;
144
145 if (command != '0' && command != '1')
146 return -EINVAL;
147
148 spin_lock_irqsave(&tb0219_lock, flags);
149 value = tb0219_read(TB0219_GPIO_OUTPUT);
150 if (command == '0')
151 value &= ~(1 << pin);
152 else
153 value |= 1 << pin;
154 tb0219_write(TB0219_GPIO_OUTPUT, value);
155 spin_unlock_irqrestore(&tb0219_lock, flags);
156
157 return 0;
158
159}
160
161static ssize_t tanbac_tb0219_read(struct file *file, char __user *buf, size_t len,
162 loff_t *ppos)
163{
164 unsigned int minor;
165 char value;
166
167 minor = iminor(file->f_dentry->d_inode);
168 switch (minor) {
169 case 0:
170 value = get_led();
171 break;
172 case 16 ... 23:
173 value = get_gpio_input_pin(minor - 16);
174 break;
175 case 32 ... 39:
176 value = get_gpio_output_pin(minor - 32);
177 break;
178 case 48 ... 55:
179 value = get_dip_switch(minor - 48);
180 break;
181 default:
182 return -EBADF;
183 }
184
185 if (len <= 0)
186 return -EFAULT;
187
188 if (put_user(value, buf))
189 return -EFAULT;
190
191 return 1;
192}
193
194static ssize_t tanbac_tb0219_write(struct file *file, const char __user *data,
195 size_t len, loff_t *ppos)
196{
197 unsigned int minor;
198 tb0219_type_t type;
199 size_t i;
200 int retval = 0;
201 char c;
202
203 minor = iminor(file->f_dentry->d_inode);
204 switch (minor) {
205 case 0:
206 type = TYPE_LED;
207 break;
208 case 32 ... 39:
209 type = TYPE_GPIO_OUTPUT;
210 break;
211 default:
212 return -EBADF;
213 }
214
215 for (i = 0; i < len; i++) {
216 if (get_user(c, data + i))
217 return -EFAULT;
218
219 switch (type) {
220 case TYPE_LED:
221 retval = set_led(c);
222 break;
223 case TYPE_GPIO_OUTPUT:
224 retval = set_gpio_output_pin(minor - 32, c);
225 break;
226 }
227
228 if (retval < 0)
229 break;
230 }
231
232 return i;
233}
234
235static int tanbac_tb0219_open(struct inode *inode, struct file *file)
236{
237 unsigned int minor;
238
239 minor = iminor(inode);
240 switch (minor) {
241 case 0:
242 case 16 ... 23:
243 case 32 ... 39:
244 case 48 ... 55:
245 return nonseekable_open(inode, file);
246 default:
247 break;
248 }
249
250 return -EBADF;
251}
252
253static int tanbac_tb0219_release(struct inode *inode, struct file *file)
254{
255 return 0;
256}
257
Arjan van de Ven62322d22006-07-03 00:24:21 -0700258static const struct file_operations tb0219_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 .owner = THIS_MODULE,
260 .read = tanbac_tb0219_read,
261 .write = tanbac_tb0219_write,
262 .open = tanbac_tb0219_open,
263 .release = tanbac_tb0219_release,
264};
265
266static void tb0219_restart(char *command)
267{
268 tb0219_write(TB0219_RESET, 0);
269}
270
Yoichi Yuasa6e498c12005-07-12 13:58:32 -0700271static void tb0219_pci_irq_init(void)
272{
273 /* PCI Slot 1 */
274 vr41xx_set_irq_trigger(TB0219_PCI_SLOT1_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH);
275 vr41xx_set_irq_level(TB0219_PCI_SLOT1_PIN, IRQ_LEVEL_LOW);
276
277 /* PCI Slot 2 */
278 vr41xx_set_irq_trigger(TB0219_PCI_SLOT2_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH);
279 vr41xx_set_irq_level(TB0219_PCI_SLOT2_PIN, IRQ_LEVEL_LOW);
280
281 /* PCI Slot 3 */
282 vr41xx_set_irq_trigger(TB0219_PCI_SLOT3_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH);
283 vr41xx_set_irq_level(TB0219_PCI_SLOT3_PIN, IRQ_LEVEL_LOW);
284}
285
Dmitry Torokhovd0497612006-03-22 00:07:55 -0800286static int __devinit tb0219_probe(struct platform_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287{
288 int retval;
289
290 if (request_mem_region(TB0219_START, TB0219_SIZE, "TB0219") == NULL)
291 return -EBUSY;
292
293 tb0219_base = ioremap(TB0219_START, TB0219_SIZE);
294 if (tb0219_base == NULL) {
295 release_mem_region(TB0219_START, TB0219_SIZE);
296 return -ENOMEM;
297 }
298
299 retval = register_chrdev(major, "TB0219", &tb0219_fops);
300 if (retval < 0) {
301 iounmap(tb0219_base);
302 tb0219_base = NULL;
303 release_mem_region(TB0219_START, TB0219_SIZE);
304 return retval;
305 }
306
307 spin_lock_init(&tb0219_lock);
308
309 old_machine_restart = _machine_restart;
310 _machine_restart = tb0219_restart;
311
Yoichi Yuasa6e498c12005-07-12 13:58:32 -0700312 tb0219_pci_irq_init();
313
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 if (major == 0) {
315 major = retval;
316 printk(KERN_INFO "TB0219: major number %d\n", major);
317 }
318
319 return 0;
320}
321
Dmitry Torokhovd0497612006-03-22 00:07:55 -0800322static int __devexit tb0219_remove(struct platform_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323{
324 _machine_restart = old_machine_restart;
325
326 iounmap(tb0219_base);
327 tb0219_base = NULL;
328
329 release_mem_region(TB0219_START, TB0219_SIZE);
330
331 return 0;
332}
333
334static struct platform_device *tb0219_platform_device;
335
Russell King3ae5eae2005-11-09 22:32:44 +0000336static struct platform_driver tb0219_device_driver = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 .probe = tb0219_probe,
Dmitry Torokhovd0497612006-03-22 00:07:55 -0800338 .remove = __devexit_p(tb0219_remove),
Russell King3ae5eae2005-11-09 22:32:44 +0000339 .driver = {
340 .name = "TB0219",
Dmitry Torokhovd0497612006-03-22 00:07:55 -0800341 .owner = THIS_MODULE,
Russell King3ae5eae2005-11-09 22:32:44 +0000342 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343};
344
Dmitry Torokhovd0497612006-03-22 00:07:55 -0800345static int __init tanbac_tb0219_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346{
347 int retval;
348
Dmitry Torokhovd0497612006-03-22 00:07:55 -0800349 tb0219_platform_device = platform_device_alloc("TB0219", -1);
350 if (!tb0219_platform_device)
351 return -ENOMEM;
352
353 retval = platform_device_add(tb0219_platform_device);
354 if (retval < 0) {
355 platform_device_put(tb0219_platform_device);
356 return retval;
357 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358
Russell King3ae5eae2005-11-09 22:32:44 +0000359 retval = platform_driver_register(&tb0219_device_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 if (retval < 0)
361 platform_device_unregister(tb0219_platform_device);
362
363 return retval;
364}
365
Dmitry Torokhovd0497612006-03-22 00:07:55 -0800366static void __exit tanbac_tb0219_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367{
Russell King3ae5eae2005-11-09 22:32:44 +0000368 platform_driver_unregister(&tb0219_device_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 platform_device_unregister(tb0219_platform_device);
370}
371
372module_init(tanbac_tb0219_init);
373module_exit(tanbac_tb0219_exit);