2 * Copyright (c) 2000 Frodo Looijaard <frodol@dds.nl>,
3 * Philip Edelbrock <phil@netroedge.com>,
4 * Mark D. Studebaker <mdsxyz123@yahoo.com>,
5 * Dan Eaton <dan.eaton@rocketlogix.com> and
6 * Stephen Rousset <stephen.rousset@rocketlogix.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 This is the driver for the SMB Host controller on
25 Acer Labs Inc. (ALI) M1535 South Bridge.
27 The M1535 is a South bridge for portable systems.
28 It is very similar to the M15x3 South bridges also produced
29 by Acer Labs Inc. Some of the registers within the part
30 have moved and some have been redefined slightly. Additionally,
31 the sequencing of the SMBus transactions has been modified
32 to be more consistent with the sequencing recommended by
33 the manufacturer and observed through testing. These
34 changes are reflected in this driver and can be identified
35 by comparing this driver to the i2c-ali15x3 driver.
36 For an overview of these chips see http://www.acerlabs.com
38 The SMB controller is part of the 7101 device, which is an
39 ACPI-compliant Power Management Unit (PMU).
41 The whole 7101 device has to be enabled for the SMB to work.
42 You can't just enable the SMB alone.
43 The SMB and the ACPI have separate I/O spaces.
44 We make sure that the SMB is enabled. We leave the ACPI alone.
46 This driver controls the SMB Host only.
48 This driver does not use interrupts.
52 /* Note: we assume there can only be one ALI1535, with one SMBus interface */
54 #include <linux/module.h>
55 #include <linux/pci.h>
56 #include <linux/kernel.h>
57 #include <linux/stddef.h>
58 #include <linux/delay.h>
59 #include <linux/ioport.h>
60 #include <linux/i2c.h>
61 #include <linux/init.h>
62 #include <linux/acpi.h>
66 /* ALI1535 SMBus address offsets */
67 #define SMBHSTSTS (0 + ali1535_smba)
68 #define SMBHSTTYP (1 + ali1535_smba)
69 #define SMBHSTPORT (2 + ali1535_smba)
70 #define SMBHSTCMD (7 + ali1535_smba)
71 #define SMBHSTADD (3 + ali1535_smba)
72 #define SMBHSTDAT0 (4 + ali1535_smba)
73 #define SMBHSTDAT1 (5 + ali1535_smba)
74 #define SMBBLKDAT (6 + ali1535_smba)
76 /* PCI Address Constants */
81 #define SMBHSTCFG 0x0F0
85 #define MAX_TIMEOUT 500 /* times 1/100 sec */
86 #define ALI1535_SMB_IOSIZE 32
88 #define ALI1535_SMB_DEFAULTBASE 0x8040
90 /* ALI1535 address lock bits */
91 #define ALI1535_LOCK 0x06 /* dwe */
93 /* ALI1535 command constants */
94 #define ALI1535_QUICK 0x00
95 #define ALI1535_BYTE 0x10
96 #define ALI1535_BYTE_DATA 0x20
97 #define ALI1535_WORD_DATA 0x30
98 #define ALI1535_BLOCK_DATA 0x40
99 #define ALI1535_I2C_READ 0x60
101 #define ALI1535_DEV10B_EN 0x80 /* Enable 10-bit addressing in */
103 #define ALI1535_T_OUT 0x08 /* Time-out Command (write) */
104 #define ALI1535_A_HIGH_BIT9 0x08 /* Bit 9 of 10-bit address in */
105 /* Alert-Response-Address */
107 #define ALI1535_KILL 0x04 /* Kill Command (write) */
108 #define ALI1535_A_HIGH_BIT8 0x04 /* Bit 8 of 10-bit address in */
109 /* Alert-Response-Address */
112 #define ALI1535_D_HI_MASK 0x03 /* Mask for isolating bits 9-8 */
113 /* of 10-bit address in I2C */
116 /* ALI1535 status register bits */
117 #define ALI1535_STS_IDLE 0x04
118 #define ALI1535_STS_BUSY 0x08 /* host busy */
119 #define ALI1535_STS_DONE 0x10 /* transaction complete */
120 #define ALI1535_STS_DEV 0x20 /* device error */
121 #define ALI1535_STS_BUSERR 0x40 /* bus error */
122 #define ALI1535_STS_FAIL 0x80 /* failed bus transaction */
123 #define ALI1535_STS_ERR 0xE0 /* all the bad error bits */
125 #define ALI1535_BLOCK_CLR 0x04 /* reset block data index */
127 /* ALI1535 device address register bits */
128 #define ALI1535_RD_ADDR 0x01 /* Read/Write Bit in Device */
132 #define ALI1535_SMBIO_EN 0x04 /* SMB I/O Space enable */
134 static struct pci_driver ali1535_driver;
135 static unsigned short ali1535_smba;
137 /* Detect whether a ALI1535 can be found, and initialize it, where necessary.
138 Note the differences between kernels with the old PCI BIOS interface and
139 newer kernels with the real PCI interface. In compat.h some things are
140 defined to make the transition easier. */
141 static int __devinit ali1535_setup(struct pci_dev *dev)
146 /* Check the following things:
147 - SMB I/O address is initialized
149 - We can use the addresses
152 /* Determine the address of the SMBus area */
153 pci_read_config_word(dev, SMBBA, &ali1535_smba);
154 ali1535_smba &= (0xffff & ~(ALI1535_SMB_IOSIZE - 1));
155 if (ali1535_smba == 0) {
157 "ALI1535_smb region uninitialized - upgrade BIOS?\n");
162 retval = acpi_check_region(ali1535_smba, ALI1535_SMB_IOSIZE,
163 ali1535_driver.name);
167 if (!request_region(ali1535_smba, ALI1535_SMB_IOSIZE,
168 ali1535_driver.name)) {
169 dev_err(&dev->dev, "ALI1535_smb region 0x%x already in use!\n",
175 /* check if whole device is enabled */
176 pci_read_config_byte(dev, SMBCFG, &temp);
177 if ((temp & ALI1535_SMBIO_EN) == 0) {
178 dev_err(&dev->dev, "SMB device not enabled - upgrade BIOS?\n");
183 /* Is SMB Host controller enabled? */
184 pci_read_config_byte(dev, SMBHSTCFG, &temp);
185 if ((temp & 1) == 0) {
186 dev_err(&dev->dev, "SMBus controller not enabled - upgrade BIOS?\n");
191 /* set SMB clock to 74KHz as recommended in data sheet */
192 pci_write_config_byte(dev, SMBCLK, 0x20);
195 The interrupt routing for SMB is set up in register 0x77 in the
196 1533 ISA Bridge device, NOT in the 7101 device.
197 Don't bother with finding the 1533 device and reading the register.
198 if ((....... & 0x0F) == 1)
199 dev_dbg(&dev->dev, "ALI1535 using Interrupt 9 for SMBus.\n");
201 pci_read_config_byte(dev, SMBREV, &temp);
202 dev_dbg(&dev->dev, "SMBREV = 0x%X\n", temp);
203 dev_dbg(&dev->dev, "ALI1535_smba = 0x%X\n", ali1535_smba);
208 release_region(ali1535_smba, ALI1535_SMB_IOSIZE);
213 static int ali1535_transaction(struct i2c_adapter *adap)
219 dev_dbg(&adap->dev, "Transaction (pre): STS=%02x, TYP=%02x, "
220 "CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
221 inb_p(SMBHSTSTS), inb_p(SMBHSTTYP), inb_p(SMBHSTCMD),
222 inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1));
225 temp = inb_p(SMBHSTSTS);
227 /* Make sure the SMBus host is ready to start transmitting */
228 /* Check the busy bit first */
229 if (temp & ALI1535_STS_BUSY) {
230 /* If the host controller is still busy, it may have timed out
231 * in the previous transaction, resulting in a "SMBus Timeout"
232 * printk. I've tried the following to reset a stuck busy bit.
233 * 1. Reset the controller with an KILL command. (this
234 * doesn't seem to clear the controller if an external
236 * 2. Reset the controller and the other SMBus devices with a
237 * T_OUT command. (this clears the host busy bit if an
238 * external device is hung, but it comes back upon a new
239 * access to a device)
240 * 3. Disable and reenable the controller in SMBHSTCFG. Worst
241 * case, nothing seems to work except power reset.
244 /* Try resetting entire SMB bus, including other devices - This
245 * may not work either - it clears the BUSY bit but then the
246 * BUSY bit may come back on when you try and use the chip
247 * again. If that's the case you are stuck.
250 "Resetting entire SMB Bus to clear busy condition (%02x)\n",
252 outb_p(ALI1535_T_OUT, SMBHSTTYP);
253 temp = inb_p(SMBHSTSTS);
256 /* now check the error bits and the busy bit */
257 if (temp & (ALI1535_STS_ERR | ALI1535_STS_BUSY)) {
258 /* do a clear-on-write */
259 outb_p(0xFF, SMBHSTSTS);
260 temp = inb_p(SMBHSTSTS);
261 if (temp & (ALI1535_STS_ERR | ALI1535_STS_BUSY)) {
262 /* This is probably going to be correctable only by a
263 * power reset as one of the bits now appears to be
265 /* This may be a bus or device with electrical problems. */
267 "SMBus reset failed! (0x%02x) - controller or "
268 "device on bus is probably hung\n", temp);
272 /* check and clear done bit */
273 if (temp & ALI1535_STS_DONE)
274 outb_p(temp, SMBHSTSTS);
277 /* start the transaction by writing anything to the start register */
278 outb_p(0xFF, SMBHSTPORT);
280 /* We will always wait for a fraction of a second! */
283 usleep_range(1000, 2000);
284 temp = inb_p(SMBHSTSTS);
285 } while (((temp & ALI1535_STS_BUSY) && !(temp & ALI1535_STS_IDLE))
286 && (timeout++ < MAX_TIMEOUT));
288 /* If the SMBus is still busy, we give up */
289 if (timeout > MAX_TIMEOUT) {
291 dev_err(&adap->dev, "SMBus Timeout!\n");
294 if (temp & ALI1535_STS_FAIL) {
296 dev_dbg(&adap->dev, "Error: Failed bus transaction\n");
299 /* Unfortunately the ALI SMB controller maps "no response" and "bus
300 * collision" into a single bit. No response is the usual case so don't
301 * do a printk. This means that bus collisions go unreported.
303 if (temp & ALI1535_STS_BUSERR) {
306 "Error: no response or bus collision ADD=%02x\n",
310 /* haven't ever seen this */
311 if (temp & ALI1535_STS_DEV) {
313 dev_err(&adap->dev, "Error: device error\n");
316 /* check to see if the "command complete" indication is set */
317 if (!(temp & ALI1535_STS_DONE)) {
319 dev_err(&adap->dev, "Error: command never completed\n");
322 dev_dbg(&adap->dev, "Transaction (post): STS=%02x, TYP=%02x, "
323 "CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
324 inb_p(SMBHSTSTS), inb_p(SMBHSTTYP), inb_p(SMBHSTCMD),
325 inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1));
327 /* take consequent actions for error conditions */
328 if (!(temp & ALI1535_STS_DONE)) {
329 /* issue "kill" to reset host controller */
330 outb_p(ALI1535_KILL, SMBHSTTYP);
331 outb_p(0xFF, SMBHSTSTS);
332 } else if (temp & ALI1535_STS_ERR) {
333 /* issue "timeout" to reset all devices on bus */
334 outb_p(ALI1535_T_OUT, SMBHSTTYP);
335 outb_p(0xFF, SMBHSTSTS);
341 /* Return negative errno on error. */
342 static s32 ali1535_access(struct i2c_adapter *adap, u16 addr,
343 unsigned short flags, char read_write, u8 command,
344 int size, union i2c_smbus_data *data)
351 /* make sure SMBus is idle */
352 temp = inb_p(SMBHSTSTS);
354 (timeout < MAX_TIMEOUT) && !(temp & ALI1535_STS_IDLE);
356 usleep_range(1000, 2000);
357 temp = inb_p(SMBHSTSTS);
359 if (timeout >= MAX_TIMEOUT)
360 dev_warn(&adap->dev, "Idle wait Timeout! STS=0x%02x\n", temp);
362 /* clear status register (clear-on-write) */
363 outb_p(0xFF, SMBHSTSTS);
366 case I2C_SMBUS_QUICK:
367 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
369 size = ALI1535_QUICK;
370 outb_p(size, SMBHSTTYP); /* output command */
373 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
376 outb_p(size, SMBHSTTYP); /* output command */
377 if (read_write == I2C_SMBUS_WRITE)
378 outb_p(command, SMBHSTCMD);
380 case I2C_SMBUS_BYTE_DATA:
381 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
383 size = ALI1535_BYTE_DATA;
384 outb_p(size, SMBHSTTYP); /* output command */
385 outb_p(command, SMBHSTCMD);
386 if (read_write == I2C_SMBUS_WRITE)
387 outb_p(data->byte, SMBHSTDAT0);
389 case I2C_SMBUS_WORD_DATA:
390 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
392 size = ALI1535_WORD_DATA;
393 outb_p(size, SMBHSTTYP); /* output command */
394 outb_p(command, SMBHSTCMD);
395 if (read_write == I2C_SMBUS_WRITE) {
396 outb_p(data->word & 0xff, SMBHSTDAT0);
397 outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
400 case I2C_SMBUS_BLOCK_DATA:
401 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
403 size = ALI1535_BLOCK_DATA;
404 outb_p(size, SMBHSTTYP); /* output command */
405 outb_p(command, SMBHSTCMD);
406 if (read_write == I2C_SMBUS_WRITE) {
407 len = data->block[0];
410 data->block[0] = len;
414 data->block[0] = len;
416 outb_p(len, SMBHSTDAT0);
417 /* Reset SMBBLKDAT */
418 outb_p(inb_p(SMBHSTTYP) | ALI1535_BLOCK_CLR, SMBHSTTYP);
419 for (i = 1; i <= len; i++)
420 outb_p(data->block[i], SMBBLKDAT);
424 dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
425 result = -EOPNOTSUPP;
429 result = ali1535_transaction(adap);
433 if ((read_write == I2C_SMBUS_WRITE) || (size == ALI1535_QUICK)) {
439 case ALI1535_BYTE: /* Result put in SMBHSTDAT0 */
440 data->byte = inb_p(SMBHSTDAT0);
442 case ALI1535_BYTE_DATA:
443 data->byte = inb_p(SMBHSTDAT0);
445 case ALI1535_WORD_DATA:
446 data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
448 case ALI1535_BLOCK_DATA:
449 len = inb_p(SMBHSTDAT0);
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]);
467 static u32 ali1535_func(struct i2c_adapter *adapter)
469 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
470 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
471 I2C_FUNC_SMBUS_BLOCK_DATA;
474 static const struct i2c_algorithm smbus_algorithm = {
475 .smbus_xfer = ali1535_access,
476 .functionality = ali1535_func,
479 static struct i2c_adapter ali1535_adapter = {
480 .owner = THIS_MODULE,
481 .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
482 .algo = &smbus_algorithm,
485 static DEFINE_PCI_DEVICE_TABLE(ali1535_ids) = {
486 { PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101) },
490 MODULE_DEVICE_TABLE(pci, ali1535_ids);
492 static int __devinit ali1535_probe(struct pci_dev *dev, const struct pci_device_id *id)
494 if (ali1535_setup(dev)) {
496 "ALI1535 not detected, module not inserted.\n");
500 /* set up the sysfs linkage to our parent device */
501 ali1535_adapter.dev.parent = &dev->dev;
503 snprintf(ali1535_adapter.name, sizeof(ali1535_adapter.name),
504 "SMBus ALI1535 adapter at %04x", ali1535_smba);
505 return i2c_add_adapter(&ali1535_adapter);
508 static void __devexit ali1535_remove(struct pci_dev *dev)
510 i2c_del_adapter(&ali1535_adapter);
511 release_region(ali1535_smba, ALI1535_SMB_IOSIZE);
514 static struct pci_driver ali1535_driver = {
515 .name = "ali1535_smbus",
516 .id_table = ali1535_ids,
517 .probe = ali1535_probe,
518 .remove = __devexit_p(ali1535_remove),
521 static int __init i2c_ali1535_init(void)
523 return pci_register_driver(&ali1535_driver);
526 static void __exit i2c_ali1535_exit(void)
528 pci_unregister_driver(&ali1535_driver);
531 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
532 "Philip Edelbrock <phil@netroedge.com>, "
533 "Mark D. Studebaker <mdsxyz123@yahoo.com> "
534 "and Dan Eaton <dan.eaton@rocketlogix.com>");
535 MODULE_DESCRIPTION("ALI1535 SMBus driver");
536 MODULE_LICENSE("GPL");
538 module_init(i2c_ali1535_init);
539 module_exit(i2c_ali1535_exit);