ia64/linux-2.6.18-xen.hg

view drivers/char/tb0219.c @ 893:f994bfe9b93b

linux/blktap2: reduce TLB flush scope

c/s 885 added very coarse TLB flushing. Since these flushes always
follow single page updates, single page flushes (when available) are
sufficient.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Jun 04 10:32:57 2009 +0100 (2009-06-04)
parents 831230e53067
children
line source
1 /*
2 * Driver for TANBAC TB0219 base board.
3 *
4 * Copyright (C) 2005 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
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>
25 #include <asm/io.h>
26 #include <asm/reboot.h>
27 #include <asm/vr41xx/giu.h>
28 #include <asm/vr41xx/tb0219.h>
30 MODULE_AUTHOR("Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>");
31 MODULE_DESCRIPTION("TANBAC TB0219 base board driver");
32 MODULE_LICENSE("GPL");
34 static int major; /* default is dynamic major device number */
35 module_param(major, int, 0);
36 MODULE_PARM_DESC(major, "Major device number");
38 static void (*old_machine_restart)(char *command);
39 static void __iomem *tb0219_base;
40 static spinlock_t tb0219_lock;
42 #define tb0219_read(offset) readw(tb0219_base + (offset))
43 #define tb0219_write(offset, value) writew((value), tb0219_base + (offset))
45 #define TB0219_START 0x0a000000UL
46 #define TB0219_SIZE 0x20UL
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
58 typedef enum {
59 TYPE_LED,
60 TYPE_GPIO_OUTPUT,
61 } tb0219_type_t;
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 */
95 static inline char get_led(void)
96 {
97 return (char)tb0219_read(TB0219_LED);
98 }
100 static inline char get_gpio_input_pin(unsigned int pin)
101 {
102 uint16_t values;
104 values = tb0219_read(TB0219_GPIO_INPUT);
105 if (values & (1 << pin))
106 return '1';
108 return '0';
109 }
111 static inline char get_gpio_output_pin(unsigned int pin)
112 {
113 uint16_t values;
115 values = tb0219_read(TB0219_GPIO_OUTPUT);
116 if (values & (1 << pin))
117 return '1';
119 return '0';
120 }
122 static inline char get_dip_switch(unsigned int pin)
123 {
124 uint16_t values;
126 values = tb0219_read(TB0219_DIP_SWITCH);
127 if (values & (1 << pin))
128 return '1';
130 return '0';
131 }
133 static inline int set_led(char command)
134 {
135 tb0219_write(TB0219_LED, command);
137 return 0;
138 }
140 static inline int set_gpio_output_pin(unsigned int pin, char command)
141 {
142 unsigned long flags;
143 uint16_t value;
145 if (command != '0' && command != '1')
146 return -EINVAL;
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);
157 return 0;
159 }
161 static 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;
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 }
185 if (len <= 0)
186 return -EFAULT;
188 if (put_user(value, buf))
189 return -EFAULT;
191 return 1;
192 }
194 static 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;
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 }
215 for (i = 0; i < len; i++) {
216 if (get_user(c, data + i))
217 return -EFAULT;
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 }
228 if (retval < 0)
229 break;
230 }
232 return i;
233 }
235 static int tanbac_tb0219_open(struct inode *inode, struct file *file)
236 {
237 unsigned int minor;
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 }
250 return -EBADF;
251 }
253 static int tanbac_tb0219_release(struct inode *inode, struct file *file)
254 {
255 return 0;
256 }
258 static const struct file_operations tb0219_fops = {
259 .owner = THIS_MODULE,
260 .read = tanbac_tb0219_read,
261 .write = tanbac_tb0219_write,
262 .open = tanbac_tb0219_open,
263 .release = tanbac_tb0219_release,
264 };
266 static void tb0219_restart(char *command)
267 {
268 tb0219_write(TB0219_RESET, 0);
269 }
271 static 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);
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);
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 }
286 static int __devinit tb0219_probe(struct platform_device *dev)
287 {
288 int retval;
290 if (request_mem_region(TB0219_START, TB0219_SIZE, "TB0219") == NULL)
291 return -EBUSY;
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 }
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 }
307 spin_lock_init(&tb0219_lock);
309 old_machine_restart = _machine_restart;
310 _machine_restart = tb0219_restart;
312 tb0219_pci_irq_init();
314 if (major == 0) {
315 major = retval;
316 printk(KERN_INFO "TB0219: major number %d\n", major);
317 }
319 return 0;
320 }
322 static int __devexit tb0219_remove(struct platform_device *dev)
323 {
324 _machine_restart = old_machine_restart;
326 iounmap(tb0219_base);
327 tb0219_base = NULL;
329 release_mem_region(TB0219_START, TB0219_SIZE);
331 return 0;
332 }
334 static struct platform_device *tb0219_platform_device;
336 static struct platform_driver tb0219_device_driver = {
337 .probe = tb0219_probe,
338 .remove = __devexit_p(tb0219_remove),
339 .driver = {
340 .name = "TB0219",
341 .owner = THIS_MODULE,
342 },
343 };
345 static int __init tanbac_tb0219_init(void)
346 {
347 int retval;
349 tb0219_platform_device = platform_device_alloc("TB0219", -1);
350 if (!tb0219_platform_device)
351 return -ENOMEM;
353 retval = platform_device_add(tb0219_platform_device);
354 if (retval < 0) {
355 platform_device_put(tb0219_platform_device);
356 return retval;
357 }
359 retval = platform_driver_register(&tb0219_device_driver);
360 if (retval < 0)
361 platform_device_unregister(tb0219_platform_device);
363 return retval;
364 }
366 static void __exit tanbac_tb0219_exit(void)
367 {
368 platform_driver_unregister(&tb0219_device_driver);
369 platform_device_unregister(tb0219_platform_device);
370 }
372 module_init(tanbac_tb0219_init);
373 module_exit(tanbac_tb0219_exit);