1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
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;
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
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
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
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
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
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);
376
