tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Driver for TANBAC TB0219 base board.
3 *
4 * Copyright (C) 2005 Yoichi Yuasa <yuasa@linux-mips.org>
5 *
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 */
20#include <linux/platform_device.h>
21#include <linux/fs.h>
22#include <linux/init.h>
23#include <linux/module.h>
24#include <linux/smp_lock.h>
25
26#include <asm/io.h>
27#include <asm/reboot.h>
28#include <asm/vr41xx/giu.h>
29#include <asm/vr41xx/tb0219.h>
30
31MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>");
32MODULE_DESCRIPTION("TANBAC TB0219 base board driver");
33MODULE_LICENSE("GPL");
34
35static int major; /* default is dynamic major device number */
36module_param(major, int, 0);
37MODULE_PARM_DESC(major, "Major device number");
38
39static void (*old_machine_restart)(char *command);
40static void __iomem *tb0219_base;
41static spinlock_t tb0219_lock;
42
43#define tb0219_read(offset) readw(tb0219_base + (offset))
44#define tb0219_write(offset, value) writew((value), tb0219_base + (offset))
45
46#define TB0219_START 0x0a000000UL
47#define TB0219_SIZE 0x20UL
48
49#define TB0219_LED 0x00
50#define TB0219_GPIO_INPUT 0x02
51#define TB0219_GPIO_OUTPUT 0x04
52#define TB0219_DIP_SWITCH 0x06
53#define TB0219_MISC 0x08
54#define TB0219_RESET 0x0e
55#define TB0219_PCI_SLOT1_IRQ_STATUS 0x10
56#define TB0219_PCI_SLOT2_IRQ_STATUS 0x12
57#define TB0219_PCI_SLOT3_IRQ_STATUS 0x14
58
59typedef enum {
60 TYPE_LED,
61 TYPE_GPIO_OUTPUT,
62} tb0219_type_t;
63
64/*
65 * Minor device number
66 * 0 = 7 segment LED
67 *
68 * 16 = GPIO IN 0
69 * 17 = GPIO IN 1
70 * 18 = GPIO IN 2
71 * 19 = GPIO IN 3
72 * 20 = GPIO IN 4
73 * 21 = GPIO IN 5
74 * 22 = GPIO IN 6
75 * 23 = GPIO IN 7
76 *
77 * 32 = GPIO OUT 0
78 * 33 = GPIO OUT 1
79 * 34 = GPIO OUT 2
80 * 35 = GPIO OUT 3
81 * 36 = GPIO OUT 4
82 * 37 = GPIO OUT 5
83 * 38 = GPIO OUT 6
84 * 39 = GPIO OUT 7
85 *
86 * 48 = DIP switch 1
87 * 49 = DIP switch 2
88 * 50 = DIP switch 3
89 * 51 = DIP switch 4
90 * 52 = DIP switch 5
91 * 53 = DIP switch 6
92 * 54 = DIP switch 7
93 * 55 = DIP switch 8
94 */
95
96static inline char get_led(void)
97{
98 return (char)tb0219_read(TB0219_LED);
99}
100
101static inline char get_gpio_input_pin(unsigned int pin)
102{
103 uint16_t values;
104
105 values = tb0219_read(TB0219_GPIO_INPUT);
106 if (values & (1 << pin))
107 return '1';
108
109 return '0';
110}
111
112static inline char get_gpio_output_pin(unsigned int pin)
113{
114 uint16_t values;
115
116 values = tb0219_read(TB0219_GPIO_OUTPUT);
117 if (values & (1 << pin))
118 return '1';
119
120 return '0';
121}
122
123static inline char get_dip_switch(unsigned int pin)
124{
125 uint16_t values;
126
127 values = tb0219_read(TB0219_DIP_SWITCH);
128 if (values & (1 << pin))
129 return '1';
130
131 return '0';
132}
133
134static inline int set_led(char command)
135{
136 tb0219_write(TB0219_LED, command);
137
138 return 0;
139}
140
141static inline int set_gpio_output_pin(unsigned int pin, char command)
142{
143 unsigned long flags;
144 uint16_t value;
145
146 if (command != '0' && command != '1')
147 return -EINVAL;
148
149 spin_lock_irqsave(&tb0219_lock, flags);
150 value = tb0219_read(TB0219_GPIO_OUTPUT);
151 if (command == '0')
152 value &= ~(1 << pin);
153 else
154 value |= 1 << pin;
155 tb0219_write(TB0219_GPIO_OUTPUT, value);
156 spin_unlock_irqrestore(&tb0219_lock, flags);
157
158 return 0;
159
160}
161
162static ssize_t tanbac_tb0219_read(struct file *file, char __user *buf, size_t len,
163 loff_t *ppos)
164{
165 unsigned int minor;
166 char value;
167
168 minor = iminor(file->f_path.dentry->d_inode);
169 switch (minor) {
170 case 0:
171 value = get_led();
172 break;
173 case 16 ... 23:
174 value = get_gpio_input_pin(minor - 16);
175 break;
176 case 32 ... 39:
177 value = get_gpio_output_pin(minor - 32);
178 break;
179 case 48 ... 55:
180 value = get_dip_switch(minor - 48);
181 break;
182 default:
183 return -EBADF;
184 }
185
186 if (len <= 0)
187 return -EFAULT;
188
189 if (put_user(value, buf))
190 return -EFAULT;
191
192 return 1;
193}
194
195static ssize_t tanbac_tb0219_write(struct file *file, const char __user *data,
196 size_t len, loff_t *ppos)
197{
198 unsigned int minor;
199 tb0219_type_t type;
200 size_t i;
201 int retval = 0;
202 char c;
203
204 minor = iminor(file->f_path.dentry->d_inode);
205 switch (minor) {
206 case 0:
207 type = TYPE_LED;
208 break;
209 case 32 ... 39:
210 type = TYPE_GPIO_OUTPUT;
211 break;
212 default:
213 return -EBADF;
214 }
215
216 for (i = 0; i < len; i++) {
217 if (get_user(c, data + i))
218 return -EFAULT;
219
220 switch (type) {
221 case TYPE_LED:
222 retval = set_led(c);
223 break;
224 case TYPE_GPIO_OUTPUT:
225 retval = set_gpio_output_pin(minor - 32, c);
226 break;
227 }
228
229 if (retval < 0)
230 break;
231 }
232
233 return i;
234}
235
236static int tanbac_tb0219_open(struct inode *inode, struct file *file)
237{
238 unsigned int minor;
239
240 cycle_kernel_lock();
241 minor = iminor(inode);
242 switch (minor) {
243 case 0:
244 case 16 ... 23:
245 case 32 ... 39:
246 case 48 ... 55:
247 return nonseekable_open(inode, file);
248 default:
249 break;
250 }
251
252 return -EBADF;
253}
254
255static int tanbac_tb0219_release(struct inode *inode, struct file *file)
256{
257 return 0;
258}
259
260static const struct file_operations tb0219_fops = {
261 .owner = THIS_MODULE,
262 .read = tanbac_tb0219_read,
263 .write = tanbac_tb0219_write,
264 .open = tanbac_tb0219_open,
265 .release = tanbac_tb0219_release,
266};
267
268static void tb0219_restart(char *command)
269{
270 tb0219_write(TB0219_RESET, 0);
271}
272
273static void tb0219_pci_irq_init(void)
274{
275 /* PCI Slot 1 */
276 vr41xx_set_irq_trigger(TB0219_PCI_SLOT1_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH);
277 vr41xx_set_irq_level(TB0219_PCI_SLOT1_PIN, IRQ_LEVEL_LOW);
278
279 /* PCI Slot 2 */
280 vr41xx_set_irq_trigger(TB0219_PCI_SLOT2_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH);
281 vr41xx_set_irq_level(TB0219_PCI_SLOT2_PIN, IRQ_LEVEL_LOW);
282
283 /* PCI Slot 3 */
284 vr41xx_set_irq_trigger(TB0219_PCI_SLOT3_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH);
285 vr41xx_set_irq_level(TB0219_PCI_SLOT3_PIN, IRQ_LEVEL_LOW);
286}
287
288static int __devinit tb0219_probe(struct platform_device *dev)
289{
290 int retval;
291
292 if (request_mem_region(TB0219_START, TB0219_SIZE, "TB0219") == NULL)
293 return -EBUSY;
294
295 tb0219_base = ioremap(TB0219_START, TB0219_SIZE);
296 if (tb0219_base == NULL) {
297 release_mem_region(TB0219_START, TB0219_SIZE);
298 return -ENOMEM;
299 }
300
301 retval = register_chrdev(major, "TB0219", &tb0219_fops);
302 if (retval < 0) {
303 iounmap(tb0219_base);
304 tb0219_base = NULL;
305 release_mem_region(TB0219_START, TB0219_SIZE);
306 return retval;
307 }
308
309 spin_lock_init(&tb0219_lock);
310
311 old_machine_restart = _machine_restart;
312 _machine_restart = tb0219_restart;
313
314 tb0219_pci_irq_init();
315
316 if (major == 0) {
317 major = retval;
318 printk(KERN_INFO "TB0219: major number %d\n", major);
319 }
320
321 return 0;
322}
323
324static int __devexit tb0219_remove(struct platform_device *dev)
325{
326 _machine_restart = old_machine_restart;
327
328 iounmap(tb0219_base);
329 tb0219_base = NULL;
330
331 release_mem_region(TB0219_START, TB0219_SIZE);
332
333 return 0;
334}
335
336static struct platform_device *tb0219_platform_device;
337
338static struct platform_driver tb0219_device_driver = {
339 .probe = tb0219_probe,
340 .remove = __devexit_p(tb0219_remove),
341 .driver = {
342 .name = "TB0219",
343 .owner = THIS_MODULE,
344 },
345};
346
347static int __init tanbac_tb0219_init(void)
348{
349 int retval;
350
351 tb0219_platform_device = platform_device_alloc("TB0219", -1);
352 if (!tb0219_platform_device)
353 return -ENOMEM;
354
355 retval = platform_device_add(tb0219_platform_device);
356 if (retval < 0) {
357 platform_device_put(tb0219_platform_device);
358 return retval;
359 }
360
361 retval = platform_driver_register(&tb0219_device_driver);
362 if (retval < 0)
363 platform_device_unregister(tb0219_platform_device);
364
365 return retval;
366}
367
368static void __exit tanbac_tb0219_exit(void)
369{
370 platform_driver_unregister(&tb0219_device_driver);
371 platform_device_unregister(tb0219_platform_device);
372}
373
374module_init(tanbac_tb0219_init);
375module_exit(tanbac_tb0219_exit);