aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/char/ite_gpio.c
blob: cde562d70c4f835c19e86ee2403985246b970309 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
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
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
/*
 * FILE NAME ite_gpio.c
 *
 * BRIEF MODULE DESCRIPTION
 *  API for ITE GPIO device.
 *  Driver for ITE GPIO device.
 *
 *  Author: MontaVista Software, Inc.  <source@mvista.com>
 *          Hai-Pao Fan <haipao@mvista.com>
 *
 * Copyright 2001 MontaVista Software Inc.
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO  EVENT  SHALL   THE AUTHOR  BE	LIABLE FOR ANY   DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  You should have received a copy of the  GNU General Public License along
 *  with this program; if not, write  to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/miscdevice.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <asm/uaccess.h>
#include <asm/addrspace.h>
#include <asm/it8172/it8172_int.h>
#include <linux/sched.h>
#include <linux/ite_gpio.h>

#define ite_gpio_base 0x14013800

#define	ITE_GPADR	(*(volatile __u8 *)(0x14013800 + KSEG1))
#define	ITE_GPBDR	(*(volatile __u8 *)(0x14013808 + KSEG1))
#define	ITE_GPCDR	(*(volatile __u8 *)(0x14013810 + KSEG1))
#define	ITE_GPACR	(*(volatile __u16 *)(0x14013802 + KSEG1))
#define	ITE_GPBCR	(*(volatile __u16 *)(0x1401380a + KSEG1))
#define	ITE_GPCCR	(*(volatile __u16 *)(0x14013812 + KSEG1))
#define ITE_GPAICR	(*(volatile __u16 *)(0x14013804 + KSEG1))
#define	ITE_GPBICR	(*(volatile __u16 *)(0x1401380c + KSEG1))
#define	ITE_GPCICR	(*(volatile __u16 *)(0x14013814 + KSEG1))
#define	ITE_GPAISR	(*(volatile __u8 *)(0x14013806 + KSEG1))
#define	ITE_GPBISR	(*(volatile __u8 *)(0x1401380e + KSEG1))
#define	ITE_GPCISR	(*(volatile __u8 *)(0x14013816 + KSEG1))
#define	ITE_GCR		(*(volatile __u8 *)(0x14013818 + KSEG1))

#define MAX_GPIO_LINE		21
static int ite_gpio_irq=IT8172_GPIO_IRQ;

static long ite_irq_counter[MAX_GPIO_LINE];
wait_queue_head_t ite_gpio_wait[MAX_GPIO_LINE];
static int ite_gpio_irq_pending[MAX_GPIO_LINE];

static int ite_gpio_debug=0;
#define DEB(x)  if (ite_gpio_debug>=1) x

int ite_gpio_in(__u32 device, __u32 mask, volatile __u32 *data)
{
	DEB(printk("ite_gpio_in mask=0x%x\n",mask)); 

	switch (device) {
	case ITE_GPIO_PORTA:
		ITE_GPACR = (__u16)mask;	/* 0xffff */
		*data = ITE_GPADR;
		break;
	case ITE_GPIO_PORTB:
		ITE_GPBCR = (__u16)mask;	/* 0xffff */
		*data = ITE_GPBDR;
		break;
	case ITE_GPIO_PORTC:
		ITE_GPCCR = (__u16)mask;	/* 0x03ff */
		*data = ITE_GPCDR;
		break;
	default:
		return -EFAULT;
	}

	return 0;
}


int ite_gpio_out(__u32 device, __u32 mask, __u32 data)
{
	switch (device) {
	case ITE_GPIO_PORTA:
		ITE_GPACR = (__u16)mask;	/* 0x5555 */
		ITE_GPADR = (__u8)data;
		break;
	case ITE_GPIO_PORTB:
		ITE_GPBCR = (__u16)mask;	/* 0x5555 */
		ITE_GPBDR = (__u8)data;
		break;
	case ITE_GPIO_PORTC:
		ITE_GPCCR = (__u16)mask;	/* 0x0155 */
		ITE_GPCDR = (__u8)data;
		break;
	default:
		return -EFAULT;
	}

	return 0;
}

int ite_gpio_int_ctrl(__u32 device, __u32 mask, __u32 data)
{
	switch (device) {
	case ITE_GPIO_PORTA:
		ITE_GPAICR = (ITE_GPAICR & ~mask) | (data & mask);
		break;
	case ITE_GPIO_PORTB:
		ITE_GPBICR = (ITE_GPBICR & ~mask) | (data & mask);
		break;
	case ITE_GPIO_PORTC:
		ITE_GPCICR = (ITE_GPCICR & ~mask) | (data & mask);
		break;
	default:
		return -EFAULT;
	}

	return 0;
}

int ite_gpio_in_status(__u32 device, __u32 mask, volatile __u32 *data)
{
	int ret=-1;

	if ((MAX_GPIO_LINE > *data) && (*data >= 0)) 
		ret=ite_gpio_irq_pending[*data];
 
	DEB(printk("ite_gpio_in_status %d ret=%d\n",*data, ret));

	switch (device) {
	case ITE_GPIO_PORTA:
		*data = ITE_GPAISR & mask;
		break;
	case ITE_GPIO_PORTB:
		*data = ITE_GPBISR & mask;
		break;
	case ITE_GPIO_PORTC:
		*data = ITE_GPCISR & mask;
		break;
	default:
		return -EFAULT;
	}

	return ret;
}

int ite_gpio_out_status(__u32 device, __u32 mask, __u32 data)
{
	switch (device) {
	case ITE_GPIO_PORTA:
		ITE_GPAISR = (ITE_GPAISR & ~mask) | (data & mask);
		break;
	case ITE_GPIO_PORTB:
		ITE_GPBISR = (ITE_GPBISR & ~mask) | (data & mask);
		break;
	case ITE_GPIO_PORTC:
		ITE_GPCISR = (ITE_GPCISR & ~mask) | (data & mask);
		break;
	default:
		return -EFAULT;
	}

	return 0;
}

int ite_gpio_gen_ctrl(__u32 device, __u32 mask, __u32 data)
{
	ITE_GCR = (ITE_GCR & ~mask) | (data & mask);

	return 0;
}

int ite_gpio_int_wait (__u32 device, __u32 mask, __u32 data)
{
	int i,line=0, ret=0;
	unsigned long flags;

	switch (device) {
	case ITE_GPIO_PORTA:
		line = data & mask;
		break;
	case ITE_GPIO_PORTB:
		line = (data & mask) <<8;
		break;
	case ITE_GPIO_PORTC:
		line = (data & mask) <<16;
		break;
	}
	for (i=MAX_GPIO_LINE-1; i >= 0; i--) {
		if ( (line) & (1 << i))
			break;
	}

	DEB(printk("wait device=0x%d mask=0x%x data=0x%x index %d\n", 
		device, mask, data, i));

	if (line & ~(1<<i))
		return -EFAULT;

	if (ite_gpio_irq_pending[i]==1)
		return -EFAULT;

	save_flags (flags);
	cli();
	ite_gpio_irq_pending[i] = 1;
	ret = interruptible_sleep_on_timeout(&ite_gpio_wait[i], 3*HZ);
	restore_flags (flags);
	ite_gpio_irq_pending[i] = 0;

	return ret;
}

EXPORT_SYMBOL(ite_gpio_in);
EXPORT_SYMBOL(ite_gpio_out);
EXPORT_SYMBOL(ite_gpio_int_ctrl);
EXPORT_SYMBOL(ite_gpio_in_status);
EXPORT_SYMBOL(ite_gpio_out_status);
EXPORT_SYMBOL(ite_gpio_gen_ctrl);
EXPORT_SYMBOL(ite_gpio_int_wait);

static int ite_gpio_open(struct inode *inode, struct file *file)
{
	return 0;
}


static int ite_gpio_release(struct inode *inode, struct file *file)
{
	return 0;
}


static int ite_gpio_ioctl(struct inode *inode, struct file *file,
	unsigned int cmd, unsigned long arg)
{
	static struct ite_gpio_ioctl_data ioctl_data;

	if (copy_from_user(&ioctl_data, (struct ite_gpio_ioctl_data *)arg,
			sizeof(ioctl_data)))
		return -EFAULT;
	if ((ioctl_data.device < ITE_GPIO_PORTA) ||
			(ioctl_data.device > ITE_GPIO_PORTC) )
				return -EFAULT;

	switch(cmd) {
		case ITE_GPIO_IN:
			if (ite_gpio_in(ioctl_data.device, ioctl_data.mask,
					   &ioctl_data.data))
				return -EFAULT;

			if (copy_to_user((struct ite_gpio_ioctl_data *)arg,
					 &ioctl_data, sizeof(ioctl_data)))
				return -EFAULT;
			break;

		case ITE_GPIO_OUT:
			return ite_gpio_out(ioctl_data.device,
					ioctl_data.mask, ioctl_data.data);
			break;

		case ITE_GPIO_INT_CTRL:
			return ite_gpio_int_ctrl(ioctl_data.device,
					ioctl_data.mask, ioctl_data.data);
			break;

		case ITE_GPIO_IN_STATUS:
			if (ite_gpio_in_status(ioctl_data.device, ioctl_data.mask,
					&ioctl_data.data))
				return -EFAULT;
			if (copy_to_user((struct ite_gpio_ioctl_data *)arg,
					&ioctl_data, sizeof(ioctl_data))) 
				return -EFAULT;
			break;

		case ITE_GPIO_OUT_STATUS:
			return ite_gpio_out_status(ioctl_data.device,
					ioctl_data.mask, ioctl_data.data);
			break;

		case ITE_GPIO_GEN_CTRL:
			return ite_gpio_gen_ctrl(ioctl_data.device,
					ioctl_data.mask, ioctl_data.data);
			break;

		case ITE_GPIO_INT_WAIT:
			return ite_gpio_int_wait(ioctl_data.device,
					ioctl_data.mask, ioctl_data.data);
			break;

		default:
			return -ENOIOCTLCMD;

	}

	return 0;
}

static void ite_gpio_irq_handler(int this_irq, void *dev_id,
	struct pt_regs *regs)
{
	int i,line;

	line = ITE_GPCISR & 0x1f;
	for (i=4; i >=0; i--) {
		if ( line & (1 << i)) { 
			++ite_irq_counter[i+16];
			ite_gpio_irq_pending[i+16] = 2;
			wake_up_interruptible(&ite_gpio_wait[i+16]);

DEB(printk("interrupt 0x%x %d\n", &ite_gpio_wait[i+16], i+16));

			ITE_GPCISR = ITE_GPCISR & (1<<i);
			return;
		}
	}
	line = ITE_GPBISR;
	for (i=7; i >= 0; i--) {
		if ( line & (1 << i)) {
			++ite_irq_counter[i+8];
			ite_gpio_irq_pending[i+8] = 2;
			wake_up_interruptible(&ite_gpio_wait[i+8]);

DEB(printk("interrupt 0x%x %d\n",ITE_GPBISR, i+8));

			ITE_GPBISR = ITE_GPBISR & (1<<i);
			return;
		}
	}
	line = ITE_GPAISR;
	for (i=7; i >= 0; i--) {
		if ( line & (1 << i)) {
			++ite_irq_counter[i];
			ite_gpio_irq_pending[i] = 2;
			wake_up_interruptible(&ite_gpio_wait[i]);

DEB(printk("interrupt 0x%x %d\n",ITE_GPAISR, i));

			ITE_GPAISR = ITE_GPAISR & (1<<i);
			return;
		}
	}
}

static const struct file_operations ite_gpio_fops = {
	.owner		= THIS_MODULE,
	.ioctl		= ite_gpio_ioctl,
	.open		= ite_gpio_open,
	.release	= ite_gpio_release,
};

static struct miscdevice ite_gpio_miscdev = {
	MISC_DYNAMIC_MINOR,
	"ite_gpio",
	&ite_gpio_fops
};

int __init ite_gpio_init(void)
{
	int i;

	if (misc_register(&ite_gpio_miscdev))
		return -ENODEV;

	if (!request_region(ite_gpio_base, 0x1c, "ITE GPIO"))
	{
		misc_deregister(&ite_gpio_miscdev);
		return -EIO;
	}

	/* initialize registers */
        ITE_GPACR = 0xffff;
        ITE_GPBCR = 0xffff;
        ITE_GPCCR = 0xffff;
        ITE_GPAICR = 0x00ff;
        ITE_GPBICR = 0x00ff;
        ITE_GPCICR = 0x00ff;
        ITE_GCR = 0;
	
	for (i = 0; i < MAX_GPIO_LINE; i++) {
		ite_gpio_irq_pending[i]=0;	
		init_waitqueue_head(&ite_gpio_wait[i]);
	}

	if (request_irq(ite_gpio_irq, ite_gpio_irq_handler, IRQF_SHARED, "gpio", 0) < 0) {
		misc_deregister(&ite_gpio_miscdev);
		release_region(ite_gpio_base, 0x1c);
		return 0;
	}

	printk("GPIO at 0x%x (irq = %d)\n", ite_gpio_base, ite_gpio_irq);

	return 0;
}	

static void __exit ite_gpio_exit(void)
{
	misc_deregister(&ite_gpio_miscdev);
}

module_init(ite_gpio_init);
module_exit(ite_gpio_exit);

MODULE_LICENSE("GPL");