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420 giacomo 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
/* #define DEBUG 1 */
57
 
58
#include <linux/module.h>
59
#include <linux/pci.h>
60
#include <linux/kernel.h>
61
#include <linux/stddef.h>
62
#include <linux/sched.h>
63
#include <linux/ioport.h>
64
#include <linux/i2c.h>
65
#include <linux/init.h>
66
#include <asm/io.h>
67
#include <asm/semaphore.h>
68
 
69
 
70
/* ALI1535 SMBus address offsets */
71
#define SMBHSTSTS       (0 + ali1535_smba)
72
#define SMBHSTTYP       (1 + ali1535_smba)
73
#define SMBHSTPORT      (2 + ali1535_smba)
74
#define SMBHSTCMD       (7 + ali1535_smba)
75
#define SMBHSTADD       (3 + ali1535_smba)
76
#define SMBHSTDAT0      (4 + ali1535_smba)
77
#define SMBHSTDAT1      (5 + ali1535_smba)
78
#define SMBBLKDAT       (6 + ali1535_smba)
79
 
80
/* PCI Address Constants */
81
#define SMBCOM          0x004
82
#define SMBREV          0x008
83
#define SMBCFG          0x0D1
84
#define SMBBA           0x0E2
85
#define SMBHSTCFG       0x0F0
86
#define SMBCLK          0x0F2
87
 
88
/* Other settings */
89
#define MAX_TIMEOUT             500     /* times 1/100 sec */
90
#define ALI1535_SMB_IOSIZE      32
91
 
92
#define ALI1535_SMB_DEFAULTBASE 0x8040
93
 
94
/* ALI1535 address lock bits */
95
#define ALI1535_LOCK            0x06    /* dwe */
96
 
97
/* ALI1535 command constants */
98
#define ALI1535_QUICK           0x00
99
#define ALI1535_BYTE            0x10
100
#define ALI1535_BYTE_DATA       0x20
101
#define ALI1535_WORD_DATA       0x30
102
#define ALI1535_BLOCK_DATA      0x40
103
#define ALI1535_I2C_READ        0x60
104
 
105
#define ALI1535_DEV10B_EN       0x80    /* Enable 10-bit addressing in  */
106
                                        /*  I2C read                    */
107
#define ALI1535_T_OUT           0x08    /* Time-out Command (write)     */
108
#define ALI1535_A_HIGH_BIT9     0x08    /* Bit 9 of 10-bit address in   */
109
                                        /* Alert-Response-Address       */
110
                                        /* (read)                       */
111
#define ALI1535_KILL            0x04    /* Kill Command (write)         */
112
#define ALI1535_A_HIGH_BIT8     0x04    /* Bit 8 of 10-bit address in   */
113
                                        /*  Alert-Response-Address      */
114
                                        /*  (read)                      */
115
 
116
#define ALI1535_D_HI_MASK       0x03    /* Mask for isolating bits 9-8  */
117
                                        /*  of 10-bit address in I2C    */
118
                                        /*  Read Command                */
119
 
120
/* ALI1535 status register bits */
121
#define ALI1535_STS_IDLE        0x04
122
#define ALI1535_STS_BUSY        0x08    /* host busy */
123
#define ALI1535_STS_DONE        0x10    /* transaction complete */
124
#define ALI1535_STS_DEV         0x20    /* device error */
125
#define ALI1535_STS_BUSERR      0x40    /* bus error    */
126
#define ALI1535_STS_FAIL        0x80    /* failed bus transaction */
127
#define ALI1535_STS_ERR         0xE0    /* all the bad error bits */
128
 
129
#define ALI1535_BLOCK_CLR       0x04    /* reset block data index */
130
 
131
/* ALI1535 device address register bits */
132
#define ALI1535_RD_ADDR         0x01    /* Read/Write Bit in Device     */
133
                                        /*  Address field               */
134
                                        /*  -> Write = 0                */
135
                                        /*  -> Read  = 1                */
136
#define ALI1535_SMBIO_EN        0x04    /* SMB I/O Space enable         */
137
 
138
 
139
static unsigned short ali1535_smba;
140
DECLARE_MUTEX(i2c_ali1535_sem);
141
 
142
/* Detect whether a ALI1535 can be found, and initialize it, where necessary.
143
   Note the differences between kernels with the old PCI BIOS interface and
144
   newer kernels with the real PCI interface. In compat.h some things are
145
   defined to make the transition easier. */
146
static int ali1535_setup(struct pci_dev *dev)
147
{
148
        int retval = -ENODEV;
149
        unsigned char temp;
150
 
151
        /* Check the following things:
152
                - SMB I/O address is initialized
153
                - Device is enabled
154
                - We can use the addresses
155
        */
156
 
157
        /* Determine the address of the SMBus area */
158
        pci_read_config_word(dev, SMBBA, &ali1535_smba);
159
        ali1535_smba &= (0xffff & ~(ALI1535_SMB_IOSIZE - 1));
160
        if (ali1535_smba == 0) {
161
                dev_warn(&dev->dev,
162
                        "ALI1535_smb region uninitialized - upgrade BIOS?\n");
163
                goto exit;
164
        }
165
 
166
        if (!request_region(ali1535_smba, ALI1535_SMB_IOSIZE, "ali1535-smb")) {
167
                dev_err(&dev->dev, "ALI1535_smb region 0x%x already in use!\n",
168
                        ali1535_smba);
169
                goto exit;
170
        }
171
 
172
        /* check if whole device is enabled */
173
        pci_read_config_byte(dev, SMBCFG, &temp);
174
        if ((temp & ALI1535_SMBIO_EN) == 0) {
175
                dev_err(&dev->dev, "SMB device not enabled - upgrade BIOS?\n");
176
                goto exit_free;
177
        }
178
 
179
        /* Is SMB Host controller enabled? */
180
        pci_read_config_byte(dev, SMBHSTCFG, &temp);
181
        if ((temp & 1) == 0) {
182
                dev_err(&dev->dev, "SMBus controller not enabled - upgrade BIOS?\n");
183
                goto exit_free;
184
        }
185
 
186
        /* set SMB clock to 74KHz as recommended in data sheet */
187
        pci_write_config_byte(dev, SMBCLK, 0x20);
188
 
189
        /*
190
          The interrupt routing for SMB is set up in register 0x77 in the
191
          1533 ISA Bridge device, NOT in the 7101 device.
192
          Don't bother with finding the 1533 device and reading the register.
193
        if ((....... & 0x0F) == 1)
194
                dev_dbg(&dev->dev, "ALI1535 using Interrupt 9 for SMBus.\n");
195
        */
196
        pci_read_config_byte(dev, SMBREV, &temp);
197
        dev_dbg(&dev->dev, "SMBREV = 0x%X\n", temp);
198
        dev_dbg(&dev->dev, "ALI1535_smba = 0x%X\n", ali1535_smba);
199
 
200
        retval = 0;
201
exit:
202
        return retval;
203
 
204
exit_free:
205
        release_region(ali1535_smba, ALI1535_SMB_IOSIZE);
206
        return retval;
207
}
208
 
209
static int ali1535_transaction(struct i2c_adapter *adap)
210
{
211
        int temp;
212
        int result = 0;
213
        int timeout = 0;
214
 
215
        dev_dbg(&adap->dev, "Transaction (pre): STS=%02x, TYP=%02x, "
216
                "CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
217
                inb_p(SMBHSTSTS), inb_p(SMBHSTTYP), inb_p(SMBHSTCMD),
218
                inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1));
219
 
220
        /* get status */
221
        temp = inb_p(SMBHSTSTS);
222
 
223
        /* Make sure the SMBus host is ready to start transmitting */
224
        /* Check the busy bit first */
225
        if (temp & ALI1535_STS_BUSY) {
226
                /* If the host controller is still busy, it may have timed out
227
                 * in the previous transaction, resulting in a "SMBus Timeout"
228
                 * printk.  I've tried the following to reset a stuck busy bit.
229
                 *   1. Reset the controller with an KILL command. (this
230
                 *      doesn't seem to clear the controller if an external
231
                 *      device is hung)
232
                 *   2. Reset the controller and the other SMBus devices with a
233
                 *      T_OUT command. (this clears the host busy bit if an
234
                 *      external device is hung, but it comes back upon a new
235
                 *      access to a device)
236
                 *   3. Disable and reenable the controller in SMBHSTCFG. Worst
237
                 *      case, nothing seems to work except power reset.
238
                 */
239
 
240
                /* Try resetting entire SMB bus, including other devices - This
241
                 * may not work either - it clears the BUSY bit but then the
242
                 * BUSY bit may come back on when you try and use the chip
243
                 * again.  If that's the case you are stuck.
244
                 */
245
                dev_info(&adap->dev,
246
                        "Resetting entire SMB Bus to clear busy condition (%02x)\n",
247
                        temp);
248
                outb_p(ALI1535_T_OUT, SMBHSTTYP);
249
                temp = inb_p(SMBHSTSTS);
250
        }
251
 
252
        /* now check the error bits and the busy bit */
253
        if (temp & (ALI1535_STS_ERR | ALI1535_STS_BUSY)) {
254
                /* do a clear-on-write */
255
                outb_p(0xFF, SMBHSTSTS);
256
                if ((temp = inb_p(SMBHSTSTS)) &
257
                    (ALI1535_STS_ERR | ALI1535_STS_BUSY)) {
258
                        /* This is probably going to be correctable only by a
259
                         * power reset as one of the bits now appears to be
260
                         * stuck */
261
                        /* This may be a bus or device with electrical problems. */
262
                        dev_err(&adap->dev,
263
                                "SMBus reset failed! (0x%02x) - controller or "
264
                                "device on bus is probably hung\n", temp);
265
                        return -1;
266
                }
267
        } else {
268
                /* check and clear done bit */
269
                if (temp & ALI1535_STS_DONE) {
270
                        outb_p(temp, SMBHSTSTS);
271
                }
272
        }
273
 
274
        /* start the transaction by writing anything to the start register */
275
        outb_p(0xFF, SMBHSTPORT);
276
 
277
        /* We will always wait for a fraction of a second! */
278
        timeout = 0;
279
        do {
280
                i2c_delay(1);
281
                temp = inb_p(SMBHSTSTS);
282
        } while (((temp & ALI1535_STS_BUSY) && !(temp & ALI1535_STS_IDLE))
283
                 && (timeout++ < MAX_TIMEOUT));
284
 
285
        /* If the SMBus is still busy, we give up */
286
        if (timeout >= MAX_TIMEOUT) {
287
                result = -1;
288
                dev_err(&adap->dev, "SMBus Timeout!\n");
289
        }
290
 
291
        if (temp & ALI1535_STS_FAIL) {
292
                result = -1;
293
                dev_dbg(&adap->dev, "Error: Failed bus transaction\n");
294
        }
295
 
296
        /* Unfortunately the ALI SMB controller maps "no response" and "bus
297
         * collision" into a single bit. No reponse is the usual case so don't
298
         * do a printk.  This means that bus collisions go unreported.
299
         */
300
        if (temp & ALI1535_STS_BUSERR) {
301
                result = -1;
302
                dev_dbg(&adap->dev,
303
                        "Error: no response or bus collision ADD=%02x\n",
304
                        inb_p(SMBHSTADD));
305
        }
306
 
307
        /* haven't ever seen this */
308
        if (temp & ALI1535_STS_DEV) {
309
                result = -1;
310
                dev_err(&adap->dev, "Error: device error\n");
311
        }
312
 
313
        /* check to see if the "command complete" indication is set */
314
        if (!(temp & ALI1535_STS_DONE)) {
315
                result = -1;
316
                dev_err(&adap->dev, "Error: command never completed\n");
317
        }
318
 
319
        dev_dbg(&adap->dev, "Transaction (post): STS=%02x, TYP=%02x, "
320
                "CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
321
                inb_p(SMBHSTSTS), inb_p(SMBHSTTYP), inb_p(SMBHSTCMD),
322
                inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1));
323
 
324
        /* take consequent actions for error conditions */
325
        if (!(temp & ALI1535_STS_DONE)) {
326
                /* issue "kill" to reset host controller */
327
                outb_p(ALI1535_KILL,SMBHSTTYP);
328
                outb_p(0xFF,SMBHSTSTS);
329
        } else if (temp & ALI1535_STS_ERR) {
330
                /* issue "timeout" to reset all devices on bus */
331
                outb_p(ALI1535_T_OUT,SMBHSTTYP);
332
                outb_p(0xFF,SMBHSTSTS);
333
        }
334
 
335
        return result;
336
}
337
 
338
/* Return -1 on error. */
339
static s32 ali1535_access(struct i2c_adapter *adap, u16 addr,
340
                          unsigned short flags, char read_write, u8 command,
341
                          int size, union i2c_smbus_data *data)
342
{
343
        int i, len;
344
        int temp;
345
        int timeout;
346
        s32 result = 0;
347
 
348
        down(&i2c_ali1535_sem);
349
        /* make sure SMBus is idle */
350
        temp = inb_p(SMBHSTSTS);
351
        for (timeout = 0;
352
             (timeout < MAX_TIMEOUT) && !(temp & ALI1535_STS_IDLE);
353
             timeout++) {
354
                i2c_delay(1);
355
                temp = inb_p(SMBHSTSTS);
356
        }
357
        if (timeout >= MAX_TIMEOUT)
358
                dev_warn(&adap->dev, "Idle wait Timeout! STS=0x%02x\n", temp);
359
 
360
        /* clear status register (clear-on-write) */
361
        outb_p(0xFF, SMBHSTSTS);
362
 
363
        switch (size) {
364
        case I2C_SMBUS_PROC_CALL:
365
                dev_err(&adap->dev, "I2C_SMBUS_PROC_CALL not supported!\n");
366
                result = -1;
367
                goto EXIT;
368
        case I2C_SMBUS_QUICK:
369
                outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
370
                       SMBHSTADD);
371
                size = ALI1535_QUICK;
372
                outb_p(size, SMBHSTTYP);        /* output command */
373
                break;
374
        case I2C_SMBUS_BYTE:
375
                outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
376
                       SMBHSTADD);
377
                size = ALI1535_BYTE;
378
                outb_p(size, SMBHSTTYP);        /* output command */
379
                if (read_write == I2C_SMBUS_WRITE)
380
                        outb_p(command, SMBHSTCMD);
381
                break;
382
        case I2C_SMBUS_BYTE_DATA:
383
                outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
384
                       SMBHSTADD);
385
                size = ALI1535_BYTE_DATA;
386
                outb_p(size, SMBHSTTYP);        /* output command */
387
                outb_p(command, SMBHSTCMD);
388
                if (read_write == I2C_SMBUS_WRITE)
389
                        outb_p(data->byte, SMBHSTDAT0);
390
                break;
391
        case I2C_SMBUS_WORD_DATA:
392
                outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
393
                       SMBHSTADD);
394
                size = ALI1535_WORD_DATA;
395
                outb_p(size, SMBHSTTYP);        /* output command */
396
                outb_p(command, SMBHSTCMD);
397
                if (read_write == I2C_SMBUS_WRITE) {
398
                        outb_p(data->word & 0xff, SMBHSTDAT0);
399
                        outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
400
                }
401
                break;
402
        case I2C_SMBUS_BLOCK_DATA:
403
                outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
404
                       SMBHSTADD);
405
                size = ALI1535_BLOCK_DATA;
406
                outb_p(size, SMBHSTTYP);        /* output command */
407
                outb_p(command, SMBHSTCMD);
408
                if (read_write == I2C_SMBUS_WRITE) {
409
                        len = data->block[0];
410
                        if (len < 0) {
411
                                len = 0;
412
                                data->block[0] = len;
413
                        }
414
                        if (len > 32) {
415
                                len = 32;
416
                                data->block[0] = len;
417
                        }
418
                        outb_p(len, SMBHSTDAT0);
419
                        /* Reset SMBBLKDAT */
420
                        outb_p(inb_p(SMBHSTTYP) | ALI1535_BLOCK_CLR, SMBHSTTYP);
421
                        for (i = 1; i <= len; i++)
422
                                outb_p(data->block[i], SMBBLKDAT);
423
                }
424
                break;
425
        }
426
 
427
        if (ali1535_transaction(adap)) {
428
                /* Error in transaction */
429
                result = -1;
430
                goto EXIT;
431
        }
432
 
433
        if ((read_write == I2C_SMBUS_WRITE) || (size == ALI1535_QUICK)) {
434
                result = 0;
435
                goto EXIT;
436
        }
437
 
438
        switch (size) {
439
        case ALI1535_BYTE:      /* Result put in SMBHSTDAT0 */
440
                data->byte = inb_p(SMBHSTDAT0);
441
                break;
442
        case ALI1535_BYTE_DATA:
443
                data->byte = inb_p(SMBHSTDAT0);
444
                break;
445
        case ALI1535_WORD_DATA:
446
                data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
447
                break;
448
        case ALI1535_BLOCK_DATA:
449
                len = inb_p(SMBHSTDAT0);
450
                if (len > 32)
451
                        len = 32;
452
                data->block[0] = len;
453
                /* Reset SMBBLKDAT */
454
                outb_p(inb_p(SMBHSTTYP) | ALI1535_BLOCK_CLR, SMBHSTTYP);
455
                for (i = 1; i <= data->block[0]; i++) {
456
                        data->block[i] = inb_p(SMBBLKDAT);
457
                        dev_dbg(&adap->dev, "Blk: len=%d, i=%d, data=%02x\n",
458
                                len, i, data->block[i]);
459
                }
460
                break;
461
        }
462
EXIT:
463
        up(&i2c_ali1535_sem);
464
        return result;
465
}
466
 
467
 
468
u32 ali1535_func(struct i2c_adapter *adapter)
469
{
470
        return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
471
            I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
472
            I2C_FUNC_SMBUS_BLOCK_DATA;
473
}
474
 
475
static struct i2c_algorithm smbus_algorithm = {
476
        .name           = "Non-i2c SMBus adapter",
477
        .id             = I2C_ALGO_SMBUS,
478
        .smbus_xfer     = ali1535_access,
479
        .functionality  = ali1535_func,
480
};
481
 
482
static struct i2c_adapter ali1535_adapter = {
483
        .owner          = THIS_MODULE,
484
        .algo           = &smbus_algorithm,
485
        .name           = "unset",
486
};
487
 
488
static struct pci_device_id ali1535_ids[] = {
489
        {
490
                .vendor =       PCI_VENDOR_ID_AL,
491
                .device =       PCI_DEVICE_ID_AL_M7101,
492
                .subvendor =    PCI_ANY_ID,
493
                .subdevice =    PCI_ANY_ID,
494
        },
495
        { },
496
};
497
 
498
static int __devinit ali1535_probe(struct pci_dev *dev, const struct pci_device_id *id)
499
{
500
        if (ali1535_setup(dev)) {
501
                dev_warn(&dev->dev,
502
                        "ALI1535 not detected, module not inserted.\n");
503
                return -ENODEV;
504
        }
505
 
506
        /* set up the driverfs linkage to our parent device */
507
        ali1535_adapter.dev.parent = &dev->dev;
508
 
509
        snprintf(ali1535_adapter.name, I2C_NAME_SIZE,
510
                "SMBus ALI1535 adapter at %04x", ali1535_smba);
511
        return i2c_add_adapter(&ali1535_adapter);
512
}
513
 
514
static void __devexit ali1535_remove(struct pci_dev *dev)
515
{
516
        i2c_del_adapter(&ali1535_adapter);
517
}
518
 
519
static struct pci_driver ali1535_driver = {
520
        .name           = "ali1535_smbus",
521
        .id_table       = ali1535_ids,
522
        .probe          = ali1535_probe,
523
        .remove         = __devexit_p(ali1535_remove),
524
};
525
 
526
static int __init i2c_ali1535_init(void)
527
{
528
        return pci_module_init(&ali1535_driver);
529
}
530
 
531
static void __exit i2c_ali1535_exit(void)
532
{
533
        pci_unregister_driver(&ali1535_driver);
534
        release_region(ali1535_smba, ALI1535_SMB_IOSIZE);
535
}
536
 
537
MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
538
              "Philip Edelbrock <phil@netroedge.com>, "
539
              "Mark D. Studebaker <mdsxyz123@yahoo.com> "
540
              "and Dan Eaton <dan.eaton@rocketlogix.com>");
541
MODULE_DESCRIPTION("ALI1535 SMBus driver");
542
MODULE_LICENSE("GPL");
543
 
544
module_init(i2c_ali1535_init);
545
module_exit(i2c_ali1535_exit);