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[S390] __syscall_return error check.
[linux-2.6/libata-dev.git] / drivers / i2c / busses / i2c-ali1535.c
blobd3ef46aeeb3ca5eb5a365d5a507f16146ecaba1b
1 /*
2 i2c-ali1535.c - Part of lm_sensors, Linux kernel modules for hardware
3 monitoring
4 Copyright (c) 2000 Frodo Looijaard <frodol@dds.nl>,
5 Philip Edelbrock <phil@netroedge.com>,
6 Mark D. Studebaker <mdsxyz123@yahoo.com>,
7 Dan Eaton <dan.eaton@rocketlogix.com> and
8 Stephen Rousset<stephen.rousset@rocketlogix.com>
9
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
14
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 */
24
25 /*
26 This is the driver for the SMB Host controller on
27 Acer Labs Inc. (ALI) M1535 South Bridge.
28
29 The M1535 is a South bridge for portable systems.
30 It is very similar to the M15x3 South bridges also produced
31 by Acer Labs Inc. Some of the registers within the part
32 have moved and some have been redefined slightly. Additionally,
33 the sequencing of the SMBus transactions has been modified
34 to be more consistent with the sequencing recommended by
35 the manufacturer and observed through testing. These
36 changes are reflected in this driver and can be identified
37 by comparing this driver to the i2c-ali15x3 driver.
38 For an overview of these chips see http://www.acerlabs.com
39
40 The SMB controller is part of the 7101 device, which is an
41 ACPI-compliant Power Management Unit (PMU).
42
43 The whole 7101 device has to be enabled for the SMB to work.
44 You can't just enable the SMB alone.
45 The SMB and the ACPI have separate I/O spaces.
46 We make sure that the SMB is enabled. We leave the ACPI alone.
47
48 This driver controls the SMB Host only.
49
50 This driver does not use interrupts.
51 */
52
53
54 /* Note: we assume there can only be one ALI1535, with one SMBus interface */
55
56 #include <linux/module.h>
57 #include <linux/pci.h>
58 #include <linux/kernel.h>
59 #include <linux/stddef.h>
60 #include <linux/sched.h>
61 #include <linux/delay.h>
62 #include <linux/ioport.h>
63 #include <linux/i2c.h>
64 #include <linux/init.h>
65 #include <asm/io.h>
66
67
68 /* ALI1535 SMBus address offsets */
69 #define SMBHSTSTS (0 + ali1535_smba)
70 #define SMBHSTTYP (1 + ali1535_smba)
71 #define SMBHSTPORT (2 + ali1535_smba)
72 #define SMBHSTCMD (7 + ali1535_smba)
73 #define SMBHSTADD (3 + ali1535_smba)
74 #define SMBHSTDAT0 (4 + ali1535_smba)
75 #define SMBHSTDAT1 (5 + ali1535_smba)
76 #define SMBBLKDAT (6 + ali1535_smba)
77
78 /* PCI Address Constants */
79 #define SMBCOM 0x004
80 #define SMBREV 0x008
81 #define SMBCFG 0x0D1
82 #define SMBBA 0x0E2
83 #define SMBHSTCFG 0x0F0
84 #define SMBCLK 0x0F2
85
86 /* Other settings */
87 #define MAX_TIMEOUT 500 /* times 1/100 sec */
88 #define ALI1535_SMB_IOSIZE 32
89
90 #define ALI1535_SMB_DEFAULTBASE 0x8040
91
92 /* ALI1535 address lock bits */
93 #define ALI1535_LOCK 0x06 /* dwe */
94
95 /* ALI1535 command constants */
96 #define ALI1535_QUICK 0x00
97 #define ALI1535_BYTE 0x10
98 #define ALI1535_BYTE_DATA 0x20
99 #define ALI1535_WORD_DATA 0x30
100 #define ALI1535_BLOCK_DATA 0x40
101 #define ALI1535_I2C_READ 0x60
102
103 #define ALI1535_DEV10B_EN 0x80 /* Enable 10-bit addressing in */
104 /* I2C read */
105 #define ALI1535_T_OUT 0x08 /* Time-out Command (write) */
106 #define ALI1535_A_HIGH_BIT9 0x08 /* Bit 9 of 10-bit address in */
107 /* Alert-Response-Address */
108 /* (read) */
109 #define ALI1535_KILL 0x04 /* Kill Command (write) */
110 #define ALI1535_A_HIGH_BIT8 0x04 /* Bit 8 of 10-bit address in */
111 /* Alert-Response-Address */
112 /* (read) */
113
114 #define ALI1535_D_HI_MASK 0x03 /* Mask for isolating bits 9-8 */
115 /* of 10-bit address in I2C */
116 /* Read Command */
117
118 /* ALI1535 status register bits */
119 #define ALI1535_STS_IDLE 0x04
120 #define ALI1535_STS_BUSY 0x08 /* host busy */
121 #define ALI1535_STS_DONE 0x10 /* transaction complete */
122 #define ALI1535_STS_DEV 0x20 /* device error */
123 #define ALI1535_STS_BUSERR 0x40 /* bus error */
124 #define ALI1535_STS_FAIL 0x80 /* failed bus transaction */
125 #define ALI1535_STS_ERR 0xE0 /* all the bad error bits */
126
127 #define ALI1535_BLOCK_CLR 0x04 /* reset block data index */
128
129 /* ALI1535 device address register bits */
130 #define ALI1535_RD_ADDR 0x01 /* Read/Write Bit in Device */
131 /* Address field */
132 /* -> Write = 0 */
133 /* -> Read = 1 */
134 #define ALI1535_SMBIO_EN 0x04 /* SMB I/O Space enable */
135
136 static struct pci_driver ali1535_driver;
137 static unsigned short ali1535_smba;
138
139 /* Detect whether a ALI1535 can be found, and initialize it, where necessary.
140 Note the differences between kernels with the old PCI BIOS interface and
141 newer kernels with the real PCI interface. In compat.h some things are
142 defined to make the transition easier. */
143 static int ali1535_setup(struct pci_dev *dev)
144 {
145 int retval = -ENODEV;
146 unsigned char temp;
147
148 /* Check the following things:
149 - SMB I/O address is initialized
150 - Device is enabled
151 - We can use the addresses
152 */
153
154 /* Determine the address of the SMBus area */
155 pci_read_config_word(dev, SMBBA, &ali1535_smba);
156 ali1535_smba &= (0xffff & ~(ALI1535_SMB_IOSIZE - 1));
157 if (ali1535_smba == 0) {
158 dev_warn(&dev->dev,
159 "ALI1535_smb region uninitialized - upgrade BIOS?\n");
160 goto exit;
161 }
162
163 if (!request_region(ali1535_smba, ALI1535_SMB_IOSIZE,
164 ali1535_driver.name)) {
165 dev_err(&dev->dev, "ALI1535_smb region 0x%x already in use!\n",
166 ali1535_smba);
167 goto exit;
168 }
169
170 /* check if whole device is enabled */
171 pci_read_config_byte(dev, SMBCFG, &temp);
172 if ((temp & ALI1535_SMBIO_EN) == 0) {
173 dev_err(&dev->dev, "SMB device not enabled - upgrade BIOS?\n");
174 goto exit_free;
175 }
176
177 /* Is SMB Host controller enabled? */
178 pci_read_config_byte(dev, SMBHSTCFG, &temp);
179 if ((temp & 1) == 0) {
180 dev_err(&dev->dev, "SMBus controller not enabled - upgrade BIOS?\n");
181 goto exit_free;
182 }
183
184 /* set SMB clock to 74KHz as recommended in data sheet */
185 pci_write_config_byte(dev, SMBCLK, 0x20);
186
187 /*
188 The interrupt routing for SMB is set up in register 0x77 in the
189 1533 ISA Bridge device, NOT in the 7101 device.
190 Don't bother with finding the 1533 device and reading the register.
191 if ((....... & 0x0F) == 1)
192 dev_dbg(&dev->dev, "ALI1535 using Interrupt 9 for SMBus.\n");
193 */
194 pci_read_config_byte(dev, SMBREV, &temp);
195 dev_dbg(&dev->dev, "SMBREV = 0x%X\n", temp);
196 dev_dbg(&dev->dev, "ALI1535_smba = 0x%X\n", ali1535_smba);
197
198 retval = 0;
199 exit:
200 return retval;
201
202 exit_free:
203 release_region(ali1535_smba, ALI1535_SMB_IOSIZE);
204 return retval;
205 }
206
207 static int ali1535_transaction(struct i2c_adapter *adap)
208 {
209 int temp;
210 int result = 0;
211 int timeout = 0;
212
213 dev_dbg(&adap->dev, "Transaction (pre): STS=%02x, TYP=%02x, "
214 "CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
215 inb_p(SMBHSTSTS), inb_p(SMBHSTTYP), inb_p(SMBHSTCMD),
216 inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1));
217
218 /* get status */
219 temp = inb_p(SMBHSTSTS);
220
221 /* Make sure the SMBus host is ready to start transmitting */
222 /* Check the busy bit first */
223 if (temp & ALI1535_STS_BUSY) {
224 /* If the host controller is still busy, it may have timed out
225 * in the previous transaction, resulting in a "SMBus Timeout"
226 * printk. I've tried the following to reset a stuck busy bit.
227 * 1. Reset the controller with an KILL command. (this
228 * doesn't seem to clear the controller if an external
229 * device is hung)
230 * 2. Reset the controller and the other SMBus devices with a
231 * T_OUT command. (this clears the host busy bit if an
232 * external device is hung, but it comes back upon a new
233 * access to a device)
234 * 3. Disable and reenable the controller in SMBHSTCFG. Worst
235 * case, nothing seems to work except power reset.
236 */
237
238 /* Try resetting entire SMB bus, including other devices - This
239 * may not work either - it clears the BUSY bit but then the
240 * BUSY bit may come back on when you try and use the chip
241 * again. If that's the case you are stuck.
242 */
243 dev_info(&adap->dev,
244 "Resetting entire SMB Bus to clear busy condition (%02x)\n",
245 temp);
246 outb_p(ALI1535_T_OUT, SMBHSTTYP);
247 temp = inb_p(SMBHSTSTS);
248 }
249
250 /* now check the error bits and the busy bit */
251 if (temp & (ALI1535_STS_ERR | ALI1535_STS_BUSY)) {
252 /* do a clear-on-write */
253 outb_p(0xFF, SMBHSTSTS);
254 if ((temp = inb_p(SMBHSTSTS)) &
255 (ALI1535_STS_ERR | ALI1535_STS_BUSY)) {
256 /* This is probably going to be correctable only by a
257 * power reset as one of the bits now appears to be
258 * stuck */
259 /* This may be a bus or device with electrical problems. */
260 dev_err(&adap->dev,
261 "SMBus reset failed! (0x%02x) - controller or "
262 "device on bus is probably hung\n", temp);
263 return -1;
264 }
265 } else {
266 /* check and clear done bit */
267 if (temp & ALI1535_STS_DONE) {
268 outb_p(temp, SMBHSTSTS);
269 }
270 }
271
272 /* start the transaction by writing anything to the start register */
273 outb_p(0xFF, SMBHSTPORT);
274
275 /* We will always wait for a fraction of a second! */
276 timeout = 0;
277 do {
278 msleep(1);
279 temp = inb_p(SMBHSTSTS);
280 } while (((temp & ALI1535_STS_BUSY) && !(temp & ALI1535_STS_IDLE))
281 && (timeout++ < MAX_TIMEOUT));
282
283 /* If the SMBus is still busy, we give up */
284 if (timeout >= MAX_TIMEOUT) {
285 result = -1;
286 dev_err(&adap->dev, "SMBus Timeout!\n");
287 }
288
289 if (temp & ALI1535_STS_FAIL) {
290 result = -1;
291 dev_dbg(&adap->dev, "Error: Failed bus transaction\n");
292 }
293
294 /* Unfortunately the ALI SMB controller maps "no response" and "bus
295 * collision" into a single bit. No reponse is the usual case so don't
296 * do a printk. This means that bus collisions go unreported.
297 */
298 if (temp & ALI1535_STS_BUSERR) {
299 result = -1;
300 dev_dbg(&adap->dev,
301 "Error: no response or bus collision ADD=%02x\n",
302 inb_p(SMBHSTADD));
303 }
304
305 /* haven't ever seen this */
306 if (temp & ALI1535_STS_DEV) {
307 result = -1;
308 dev_err(&adap->dev, "Error: device error\n");
309 }
310
311 /* check to see if the "command complete" indication is set */
312 if (!(temp & ALI1535_STS_DONE)) {
313 result = -1;
314 dev_err(&adap->dev, "Error: command never completed\n");
315 }
316
317 dev_dbg(&adap->dev, "Transaction (post): STS=%02x, TYP=%02x, "
318 "CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
319 inb_p(SMBHSTSTS), inb_p(SMBHSTTYP), inb_p(SMBHSTCMD),
320 inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1));
321
322 /* take consequent actions for error conditions */
323 if (!(temp & ALI1535_STS_DONE)) {
324 /* issue "kill" to reset host controller */
325 outb_p(ALI1535_KILL,SMBHSTTYP);
326 outb_p(0xFF,SMBHSTSTS);
327 } else if (temp & ALI1535_STS_ERR) {
328 /* issue "timeout" to reset all devices on bus */
329 outb_p(ALI1535_T_OUT,SMBHSTTYP);
330 outb_p(0xFF,SMBHSTSTS);
331 }
332
333 return result;
334 }
335
336 /* Return -1 on error. */
337 static s32 ali1535_access(struct i2c_adapter *adap, u16 addr,
338 unsigned short flags, char read_write, u8 command,
339 int size, union i2c_smbus_data *data)
340 {
341 int i, len;
342 int temp;
343 int timeout;
344 s32 result = 0;
345
346 /* make sure SMBus is idle */
347 temp = inb_p(SMBHSTSTS);
348 for (timeout = 0;
349 (timeout < MAX_TIMEOUT) && !(temp & ALI1535_STS_IDLE);
350 timeout++) {
351 msleep(1);
352 temp = inb_p(SMBHSTSTS);
353 }
354 if (timeout >= MAX_TIMEOUT)
355 dev_warn(&adap->dev, "Idle wait Timeout! STS=0x%02x\n", temp);
356
357 /* clear status register (clear-on-write) */
358 outb_p(0xFF, SMBHSTSTS);
359
360 switch (size) {
361 case I2C_SMBUS_PROC_CALL:
362 dev_err(&adap->dev, "I2C_SMBUS_PROC_CALL not supported!\n");
363 result = -1;
364 goto EXIT;
365 case I2C_SMBUS_QUICK:
366 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
367 SMBHSTADD);
368 size = ALI1535_QUICK;
369 outb_p(size, SMBHSTTYP); /* output command */
370 break;
371 case I2C_SMBUS_BYTE:
372 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
373 SMBHSTADD);
374 size = ALI1535_BYTE;
375 outb_p(size, SMBHSTTYP); /* output command */
376 if (read_write == I2C_SMBUS_WRITE)
377 outb_p(command, SMBHSTCMD);
378 break;
379 case I2C_SMBUS_BYTE_DATA:
380 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
381 SMBHSTADD);
382 size = ALI1535_BYTE_DATA;
383 outb_p(size, SMBHSTTYP); /* output command */
384 outb_p(command, SMBHSTCMD);
385 if (read_write == I2C_SMBUS_WRITE)
386 outb_p(data->byte, SMBHSTDAT0);
387 break;
388 case I2C_SMBUS_WORD_DATA:
389 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
390 SMBHSTADD);
391 size = ALI1535_WORD_DATA;
392 outb_p(size, SMBHSTTYP); /* output command */
393 outb_p(command, SMBHSTCMD);
394 if (read_write == I2C_SMBUS_WRITE) {
395 outb_p(data->word & 0xff, SMBHSTDAT0);
396 outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
397 }
398 break;
399 case I2C_SMBUS_BLOCK_DATA:
400 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
401 SMBHSTADD);
402 size = ALI1535_BLOCK_DATA;
403 outb_p(size, SMBHSTTYP); /* output command */
404 outb_p(command, SMBHSTCMD);
405 if (read_write == I2C_SMBUS_WRITE) {
406 len = data->block[0];
407 if (len < 0) {
408 len = 0;
409 data->block[0] = len;
410 }
411 if (len > 32) {
412 len = 32;
413 data->block[0] = len;
414 }
415 outb_p(len, SMBHSTDAT0);
416 /* Reset SMBBLKDAT */
417 outb_p(inb_p(SMBHSTTYP) | ALI1535_BLOCK_CLR, SMBHSTTYP);
418 for (i = 1; i <= len; i++)
419 outb_p(data->block[i], SMBBLKDAT);
420 }
421 break;
422 }
423
424 if (ali1535_transaction(adap)) {
425 /* Error in transaction */
426 result = -1;
427 goto EXIT;
428 }
429
430 if ((read_write == I2C_SMBUS_WRITE) || (size == ALI1535_QUICK)) {
431 result = 0;
432 goto EXIT;
433 }
434
435 switch (size) {
436 case ALI1535_BYTE: /* Result put in SMBHSTDAT0 */
437 data->byte = inb_p(SMBHSTDAT0);
438 break;
439 case ALI1535_BYTE_DATA:
440 data->byte = inb_p(SMBHSTDAT0);
441 break;
442 case ALI1535_WORD_DATA:
443 data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
444 break;
445 case ALI1535_BLOCK_DATA:
446 len = inb_p(SMBHSTDAT0);
447 if (len > 32)
448 len = 32;
449 data->block[0] = len;
450 /* Reset SMBBLKDAT */
451 outb_p(inb_p(SMBHSTTYP) | ALI1535_BLOCK_CLR, SMBHSTTYP);
452 for (i = 1; i <= data->block[0]; i++) {
453 data->block[i] = inb_p(SMBBLKDAT);
454 dev_dbg(&adap->dev, "Blk: len=%d, i=%d, data=%02x\n",
455 len, i, data->block[i]);
456 }
457 break;
458 }
459 EXIT:
460 return result;
461 }
462
463
464 static u32 ali1535_func(struct i2c_adapter *adapter)
465 {
466 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
467 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
468 I2C_FUNC_SMBUS_BLOCK_DATA;
469 }
470
471 static struct i2c_algorithm smbus_algorithm = {
472 .smbus_xfer = ali1535_access,
473 .functionality = ali1535_func,
474 };
475
476 static struct i2c_adapter ali1535_adapter = {
477 .owner = THIS_MODULE,
478 .class = I2C_CLASS_HWMON,
479 .algo = &smbus_algorithm,
480 };
481
482 static struct pci_device_id ali1535_ids[] = {
483 { PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101) },
484 { },
485 };
486
487 MODULE_DEVICE_TABLE (pci, ali1535_ids);
488
489 static int __devinit ali1535_probe(struct pci_dev *dev, const struct pci_device_id *id)
490 {
491 if (ali1535_setup(dev)) {
492 dev_warn(&dev->dev,
493 "ALI1535 not detected, module not inserted.\n");
494 return -ENODEV;
495 }
496
497 /* set up the driverfs linkage to our parent device */
498 ali1535_adapter.dev.parent = &dev->dev;
499
500 snprintf(ali1535_adapter.name, I2C_NAME_SIZE,
501 "SMBus ALI1535 adapter at %04x", ali1535_smba);
502 return i2c_add_adapter(&ali1535_adapter);
503 }
504
505 static void __devexit ali1535_remove(struct pci_dev *dev)
506 {
507 i2c_del_adapter(&ali1535_adapter);
508 release_region(ali1535_smba, ALI1535_SMB_IOSIZE);
509 }
510
511 static struct pci_driver ali1535_driver = {
512 .name = "ali1535_smbus",
513 .id_table = ali1535_ids,
514 .probe = ali1535_probe,
515 .remove = __devexit_p(ali1535_remove),
516 };
517
518 static int __init i2c_ali1535_init(void)
519 {
520 return pci_register_driver(&ali1535_driver);
521 }
522
523 static void __exit i2c_ali1535_exit(void)
524 {
525 pci_unregister_driver(&ali1535_driver);
526 }
527
528 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
529 "Philip Edelbrock <phil@netroedge.com>, "
530 "Mark D. Studebaker <mdsxyz123@yahoo.com> "
531 "and Dan Eaton <dan.eaton@rocketlogix.com>");
532 MODULE_DESCRIPTION("ALI1535 SMBus driver");
533 MODULE_LICENSE("GPL");
534
535 module_init(i2c_ali1535_init);
536 module_exit(i2c_ali1535_exit);
Linux 2.6 libata-dev (mirror)