aboutsummaryrefslogtreecommitdiff
path: root/drivers/i2c/busses/i2c-ali1563.c
blob: f70f46582c6c3a8cc4533abbd914dab0a338dc18 (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
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
/**
 *	i2c-ali1563.c - i2c driver for the ALi 1563 Southbridge
 *
 *	Copyright (C) 2004 Patrick Mochel
 *		      2005 Rudolf Marek <r.marek@assembler.cz>
 *
 *	The 1563 southbridge is deceptively similar to the 1533, with a
 *	few notable exceptions. One of those happens to be the fact they
 *	upgraded the i2c core to be 2.0 compliant, and happens to be almost
 *	identical to the i2c controller found in the Intel 801 south
 *	bridges.
 *
 *	This driver is based on a mix of the 15x3, 1535, and i801 drivers,
 *	with a little help from the ALi 1563 spec.
 *
 *	This file is released under the GPLv2
 */

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/acpi.h>

#define ALI1563_MAX_TIMEOUT	500
#define	ALI1563_SMBBA		0x80
#define ALI1563_SMB_IOEN	1
#define ALI1563_SMB_HOSTEN	2
#define ALI1563_SMB_IOSIZE	16

#define SMB_HST_STS	(ali1563_smba + 0)
#define SMB_HST_CNTL1	(ali1563_smba + 1)
#define SMB_HST_CNTL2	(ali1563_smba + 2)
#define SMB_HST_CMD	(ali1563_smba + 3)
#define SMB_HST_ADD	(ali1563_smba + 4)
#define SMB_HST_DAT0	(ali1563_smba + 5)
#define SMB_HST_DAT1	(ali1563_smba + 6)
#define SMB_BLK_DAT	(ali1563_smba + 7)

#define HST_STS_BUSY	0x01
#define HST_STS_INTR	0x02
#define HST_STS_DEVERR	0x04
#define HST_STS_BUSERR	0x08
#define HST_STS_FAIL	0x10
#define HST_STS_DONE	0x80
#define HST_STS_BAD	0x1c


#define HST_CNTL1_TIMEOUT	0x80
#define HST_CNTL1_LAST		0x40

#define HST_CNTL2_KILL		0x04
#define HST_CNTL2_START		0x40
#define HST_CNTL2_QUICK		0x00
#define HST_CNTL2_BYTE		0x01
#define HST_CNTL2_BYTE_DATA	0x02
#define HST_CNTL2_WORD_DATA	0x03
#define HST_CNTL2_BLOCK		0x05


#define HST_CNTL2_SIZEMASK	0x38

static struct pci_driver ali1563_pci_driver;
static unsigned short ali1563_smba;

static int ali1563_transaction(struct i2c_adapter * a, int size)
{
	u32 data;
	int timeout;
	int status = -EIO;

	dev_dbg(&a->dev, "Transaction (pre): STS=%02x, CNTL1=%02x, "
		"CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
		inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
		inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
		inb_p(SMB_HST_DAT1));

	data = inb_p(SMB_HST_STS);
	if (data & HST_STS_BAD) {
		dev_err(&a->dev, "ali1563: Trying to reset busy device\n");
		outb_p(data | HST_STS_BAD,SMB_HST_STS);
		data = inb_p(SMB_HST_STS);
		if (data & HST_STS_BAD)
			return -EBUSY;
	}
	outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_START, SMB_HST_CNTL2);

	timeout = ALI1563_MAX_TIMEOUT;
	do
		msleep(1);
	while (((data = inb_p(SMB_HST_STS)) & HST_STS_BUSY) && --timeout);

	dev_dbg(&a->dev, "Transaction (post): STS=%02x, CNTL1=%02x, "
		"CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
		inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
		inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
		inb_p(SMB_HST_DAT1));

	if (timeout && !(data & HST_STS_BAD))
		return 0;

	if (!timeout) {
		dev_err(&a->dev, "Timeout - Trying to KILL transaction!\n");
		/* Issue 'kill' to host controller */
		outb_p(HST_CNTL2_KILL,SMB_HST_CNTL2);
		data = inb_p(SMB_HST_STS);
		status = -ETIMEDOUT;
 	}

	/* device error - no response, ignore the autodetection case */
	if (data & HST_STS_DEVERR) {
		if (size != HST_CNTL2_QUICK)
			dev_err(&a->dev, "Device error!\n");
		status = -ENXIO;
	}
	/* bus collision */
	if (data & HST_STS_BUSERR) {
		dev_err(&a->dev, "Bus collision!\n");
		/* Issue timeout, hoping it helps */
		outb_p(HST_CNTL1_TIMEOUT,SMB_HST_CNTL1);
	}

	if (data & HST_STS_FAIL) {
		dev_err(&a->dev, "Cleaning fail after KILL!\n");
		outb_p(0x0,SMB_HST_CNTL2);
	}

	return status;
}

static int ali1563_block_start(struct i2c_adapter * a)
{
	u32 data;
	int timeout;
	int status = -EIO;

	dev_dbg(&a->dev, "Block (pre): STS=%02x, CNTL1=%02x, "
		"CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
		inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
		inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
		inb_p(SMB_HST_DAT1));

	data = inb_p(SMB_HST_STS);
	if (data & HST_STS_BAD) {
		dev_warn(&a->dev,"ali1563: Trying to reset busy device\n");
		outb_p(data | HST_STS_BAD,SMB_HST_STS);
		data = inb_p(SMB_HST_STS);
		if (data & HST_STS_BAD)
			return -EBUSY;
	}

	/* Clear byte-ready bit */
	outb_p(data | HST_STS_DONE, SMB_HST_STS);

	/* Start transaction and wait for byte-ready bit to be set */
	outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_START, SMB_HST_CNTL2);

	timeout = ALI1563_MAX_TIMEOUT;
	do
		msleep(1);
	while (!((data = inb_p(SMB_HST_STS)) & HST_STS_DONE) && --timeout);

	dev_dbg(&a->dev, "Block (post): STS=%02x, CNTL1=%02x, "
		"CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
		inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
		inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
		inb_p(SMB_HST_DAT1));

	if (timeout && !(data & HST_STS_BAD))
		return 0;

	if (timeout == 0)
		status = -ETIMEDOUT;

	if (data & HST_STS_DEVERR)
		status = -ENXIO;

	dev_err(&a->dev, "SMBus Error: %s%s%s%s%s\n",
		timeout ? "" : "Timeout ",
		data & HST_STS_FAIL ? "Transaction Failed " : "",
		data & HST_STS_BUSERR ? "No response or Bus Collision " : "",
		data & HST_STS_DEVERR ? "Device Error " : "",
		!(data & HST_STS_DONE) ? "Transaction Never Finished " : "");
	return status;
}

static int ali1563_block(struct i2c_adapter * a, union i2c_smbus_data * data, u8 rw)
{
	int i, len;
	int error = 0;

	/* Do we need this? */
	outb_p(HST_CNTL1_LAST,SMB_HST_CNTL1);

	if (rw == I2C_SMBUS_WRITE) {
		len = data->block[0];
		if (len < 1)
			len = 1;
		else if (len > 32)
			len = 32;
		outb_p(len,SMB_HST_DAT0);
		outb_p(data->block[1],SMB_BLK_DAT);
	} else
		len = 32;

	outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_BLOCK, SMB_HST_CNTL2);

	for (i = 0; i < len; i++) {
		if (rw == I2C_SMBUS_WRITE) {
			outb_p(data->block[i + 1], SMB_BLK_DAT);
			if ((error = ali1563_block_start(a)))
				break;
		} else {
			if ((error = ali1563_block_start(a)))
				break;
			if (i == 0) {
				len = inb_p(SMB_HST_DAT0);
				if (len < 1)
					len = 1;
				else if (len > 32)
					len = 32;
			}
			data->block[i+1] = inb_p(SMB_BLK_DAT);
		}
	}
	/* Do we need this? */
	outb_p(HST_CNTL1_LAST,SMB_HST_CNTL1);
	return error;
}

static s32 ali1563_access(struct i2c_adapter * a, u16 addr,
			  unsigned short flags, char rw, u8 cmd,
			  int size, union i2c_smbus_data * data)
{
	int error = 0;
	int timeout;
	u32 reg;

	for (timeout = ALI1563_MAX_TIMEOUT; timeout; timeout--) {
		if (!(reg = inb_p(SMB_HST_STS) & HST_STS_BUSY))
			break;
	}
	if (!timeout)
		dev_warn(&a->dev,"SMBus not idle. HST_STS = %02x\n",reg);
	outb_p(0xff,SMB_HST_STS);

	/* Map the size to what the chip understands */
	switch (size) {
	case I2C_SMBUS_QUICK:
		size = HST_CNTL2_QUICK;
		break;
	case I2C_SMBUS_BYTE:
		size = HST_CNTL2_BYTE;
		break;
	case I2C_SMBUS_BYTE_DATA:
		size = HST_CNTL2_BYTE_DATA;
		break;
	case I2C_SMBUS_WORD_DATA:
		size = HST_CNTL2_WORD_DATA;
		break;
	case I2C_SMBUS_BLOCK_DATA:
		size = HST_CNTL2_BLOCK;
		break;
	default:
		dev_warn(&a->dev, "Unsupported transaction %d\n", size);
		error = -EOPNOTSUPP;
		goto Done;
	}

	outb_p(((addr & 0x7f) << 1) | (rw & 0x01), SMB_HST_ADD);
	outb_p((inb_p(SMB_HST_CNTL2) & ~HST_CNTL2_SIZEMASK) | (size << 3), SMB_HST_CNTL2);

	/* Write the command register */

	switch(size) {
	case HST_CNTL2_BYTE:
		if (rw== I2C_SMBUS_WRITE)
			/* Beware it uses DAT0 register and not CMD! */
			outb_p(cmd, SMB_HST_DAT0);
		break;
	case HST_CNTL2_BYTE_DATA:
		outb_p(cmd, SMB_HST_CMD);
		if (rw == I2C_SMBUS_WRITE)
			outb_p(data->byte, SMB_HST_DAT0);
		break;
	case HST_CNTL2_WORD_DATA:
		outb_p(cmd, SMB_HST_CMD);
		if (rw == I2C_SMBUS_WRITE) {
			outb_p(data->word & 0xff, SMB_HST_DAT0);
			outb_p((data->word & 0xff00) >> 8, SMB_HST_DAT1);
		}
		break;
	case HST_CNTL2_BLOCK:
		outb_p(cmd, SMB_HST_CMD);
		error = ali1563_block(a,data,rw);
		goto Done;
	}

	if ((error = ali1563_transaction(a, size)))
		goto Done;

	if ((rw == I2C_SMBUS_WRITE) || (size == HST_CNTL2_QUICK))
		goto Done;

	switch (size) {
	case HST_CNTL2_BYTE:	/* Result put in SMBHSTDAT0 */
		data->byte = inb_p(SMB_HST_DAT0);
		break;
	case HST_CNTL2_BYTE_DATA:
		data->byte = inb_p(SMB_HST_DAT0);
		break;
	case HST_CNTL2_WORD_DATA:
		data->word = inb_p(SMB_HST_DAT0) + (inb_p(SMB_HST_DAT1) << 8);
		break;
	}
Done:
	return error;
}

static u32 ali1563_func(struct i2c_adapter * a)
{
	return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
	    I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
	    I2C_FUNC_SMBUS_BLOCK_DATA;
}


static int __devinit ali1563_setup(struct pci_dev * dev)
{
	u16 ctrl;

	pci_read_config_word(dev,ALI1563_SMBBA,&ctrl);

	/* SMB I/O Base in high 12 bits and must be aligned with the
	 * size of the I/O space. */
	ali1563_smba = ctrl & ~(ALI1563_SMB_IOSIZE - 1);
	if (!ali1563_smba) {
		dev_warn(&dev->dev,"ali1563_smba Uninitialized\n");
		goto Err;
	}

	/* Check if device is enabled */
	if (!(ctrl & ALI1563_SMB_HOSTEN)) {
		dev_warn(&dev->dev, "Host Controller not enabled\n");
		goto Err;
	}
	if (!(ctrl & ALI1563_SMB_IOEN)) {
		dev_warn(&dev->dev, "I/O space not enabled, trying manually\n");
		pci_write_config_word(dev, ALI1563_SMBBA,
				      ctrl | ALI1563_SMB_IOEN);
		pci_read_config_word(dev, ALI1563_SMBBA, &ctrl);
		if (!(ctrl & ALI1563_SMB_IOEN)) {
			dev_err(&dev->dev, "I/O space still not enabled, "
				"giving up\n");
			goto Err;
		}
	}

	if (acpi_check_region(ali1563_smba, ALI1563_SMB_IOSIZE,
			      ali1563_pci_driver.name))
		goto Err;

	if (!request_region(ali1563_smba, ALI1563_SMB_IOSIZE,
			    ali1563_pci_driver.name)) {
		dev_err(&dev->dev, "Could not allocate I/O space at 0x%04x\n",
			ali1563_smba);
		goto Err;
	}
	dev_info(&dev->dev, "Found ALi1563 SMBus at 0x%04x\n", ali1563_smba);

	return 0;
Err:
	return -ENODEV;
}

static void ali1563_shutdown(struct pci_dev *dev)
{
	release_region(ali1563_smba,ALI1563_SMB_IOSIZE);
}

static const struct i2c_algorithm ali1563_algorithm = {
	.smbus_xfer	= ali1563_access,
	.functionality	= ali1563_func,
};

static struct i2c_adapter ali1563_adapter = {
	.owner	= THIS_MODULE,
	.class	= I2C_CLASS_HWMON | I2C_CLASS_SPD,
	.algo	= &ali1563_algorithm,
};

static int __devinit ali1563_probe(struct pci_dev * dev,
				const struct pci_device_id * id_table)
{
	int error;

	if ((error = ali1563_setup(dev)))
		goto exit;
	ali1563_adapter.dev.parent = &dev->dev;
	snprintf(ali1563_adapter.name, sizeof(ali1563_adapter.name),
		 "SMBus ALi 1563 Adapter @ %04x", ali1563_smba);
	if ((error = i2c_add_adapter(&ali1563_adapter)))
		goto exit_shutdown;
	return 0;

exit_shutdown:
	ali1563_shutdown(dev);
exit:
	dev_warn(&dev->dev, "ALi1563 SMBus probe failed (%d)\n", error);
	return error;
}

static void __devexit ali1563_remove(struct pci_dev * dev)
{
	i2c_del_adapter(&ali1563_adapter);
	ali1563_shutdown(dev);
}

static struct pci_device_id __devinitdata ali1563_id_table[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1563) },
	{},
};

MODULE_DEVICE_TABLE (pci, ali1563_id_table);

static struct pci_driver ali1563_pci_driver = {
 	.name		= "ali1563_smbus",
	.id_table	= ali1563_id_table,
 	.probe		= ali1563_probe,
	.remove		= __devexit_p(ali1563_remove),
};

static int __init ali1563_init(void)
{
	return pci_register_driver(&ali1563_pci_driver);
}

module_init(ali1563_init);

static void __exit ali1563_exit(void)
{
	pci_unregister_driver(&ali1563_pci_driver);
}

module_exit(ali1563_exit);

MODULE_LICENSE("GPL");