2 i2c-ali1535.c - Part of lm_sensors, Linux kernel modules for hardware
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>
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.
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.
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.
26 This is the driver for the SMB Host controller on
27 Acer Labs Inc. (ALI) M1535 South Bridge.
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
40 The SMB controller is part of the 7101 device, which is an
41 ACPI-compliant Power Management Unit (PMU).
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.
48 This driver controls the SMB Host only.
50 This driver does not use interrupts.
54 /* Note: we assume there can only be one ALI1535, with one SMBus interface */
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>
67 #include <asm/semaphore.h>
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)
80 /* PCI Address Constants */
85 #define SMBHSTCFG 0x0F0
89 #define MAX_TIMEOUT 500 /* times 1/100 sec */
90 #define ALI1535_SMB_IOSIZE 32
92 #define ALI1535_SMB_DEFAULTBASE 0x8040
94 /* ALI1535 address lock bits */
95 #define ALI1535_LOCK 0x06 /* dwe */
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
105 #define ALI1535_DEV10B_EN 0x80 /* Enable 10-bit addressing in */
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 */
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 */
116 #define ALI1535_D_HI_MASK 0x03 /* Mask for isolating bits 9-8 */
117 /* of 10-bit address in I2C */
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 */
129 #define ALI1535_BLOCK_CLR 0x04 /* reset block data index */
131 /* ALI1535 device address register bits */
132 #define ALI1535_RD_ADDR 0x01 /* Read/Write Bit in Device */
136 #define ALI1535_SMBIO_EN 0x04 /* SMB I/O Space enable */
139 static unsigned short ali1535_smba;
140 DECLARE_MUTEX(i2c_ali1535_sem);
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)
148 int retval = -ENODEV;
151 /* Check the following things:
152 - SMB I/O address is initialized
154 - We can use the addresses
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) {
162 "ALI1535_smb region uninitialized - upgrade BIOS?\n");
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",
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");
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");
186 /* set SMB clock to 74KHz as recommended in data sheet */
187 pci_write_config_byte(dev, SMBCLK, 0x20);
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");
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);
205 release_region(ali1535_smba, ALI1535_SMB_IOSIZE);
209 static void ali1535_do_pause(unsigned int amount)
211 current->state = TASK_INTERRUPTIBLE;
212 schedule_timeout(amount);
215 static int ali1535_transaction(struct i2c_adapter *adap)
221 dev_dbg(&adap->dev, "Transaction (pre): STS=%02x, TYP=%02x, "
222 "CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
223 inb_p(SMBHSTSTS), inb_p(SMBHSTTYP), inb_p(SMBHSTCMD),
224 inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1));
227 temp = inb_p(SMBHSTSTS);
229 /* Make sure the SMBus host is ready to start transmitting */
230 /* Check the busy bit first */
231 if (temp & ALI1535_STS_BUSY) {
232 /* If the host controller is still busy, it may have timed out
233 * in the previous transaction, resulting in a "SMBus Timeout"
234 * printk. I've tried the following to reset a stuck busy bit.
235 * 1. Reset the controller with an KILL command. (this
236 * doesn't seem to clear the controller if an external
238 * 2. Reset the controller and the other SMBus devices with a
239 * T_OUT command. (this clears the host busy bit if an
240 * external device is hung, but it comes back upon a new
241 * access to a device)
242 * 3. Disable and reenable the controller in SMBHSTCFG. Worst
243 * case, nothing seems to work except power reset.
246 /* Try resetting entire SMB bus, including other devices - This
247 * may not work either - it clears the BUSY bit but then the
248 * BUSY bit may come back on when you try and use the chip
249 * again. If that's the case you are stuck.
252 "Resetting entire SMB Bus to clear busy condition (%02x)\n",
254 outb_p(ALI1535_T_OUT, SMBHSTTYP);
255 temp = inb_p(SMBHSTSTS);
258 /* now check the error bits and the busy bit */
259 if (temp & (ALI1535_STS_ERR | ALI1535_STS_BUSY)) {
260 /* do a clear-on-write */
261 outb_p(0xFF, SMBHSTSTS);
262 if ((temp = inb_p(SMBHSTSTS)) &
263 (ALI1535_STS_ERR | ALI1535_STS_BUSY)) {
264 /* This is probably going to be correctable only by a
265 * power reset as one of the bits now appears to be
267 /* This may be a bus or device with electrical problems. */
269 "SMBus reset failed! (0x%02x) - controller or "
270 "device on bus is probably hung\n", temp);
274 /* check and clear done bit */
275 if (temp & ALI1535_STS_DONE) {
276 outb_p(temp, SMBHSTSTS);
280 /* start the transaction by writing anything to the start register */
281 outb_p(0xFF, SMBHSTPORT);
283 /* We will always wait for a fraction of a second! */
287 temp = inb_p(SMBHSTSTS);
288 } while (((temp & ALI1535_STS_BUSY) && !(temp & ALI1535_STS_IDLE))
289 && (timeout++ < MAX_TIMEOUT));
291 /* If the SMBus is still busy, we give up */
292 if (timeout >= MAX_TIMEOUT) {
294 dev_err(&adap->dev, "SMBus Timeout!\n");
297 if (temp & ALI1535_STS_FAIL) {
299 dev_dbg(&adap->dev, "Error: Failed bus transaction\n");
302 /* Unfortunately the ALI SMB controller maps "no response" and "bus
303 * collision" into a single bit. No reponse is the usual case so don't
304 * do a printk. This means that bus collisions go unreported.
306 if (temp & ALI1535_STS_BUSERR) {
309 "Error: no response or bus collision ADD=%02x\n",
313 /* haven't ever seen this */
314 if (temp & ALI1535_STS_DEV) {
316 dev_err(&adap->dev, "Error: device error\n");
319 /* check to see if the "command complete" indication is set */
320 if (!(temp & ALI1535_STS_DONE)) {
322 dev_err(&adap->dev, "Error: command never completed\n");
325 dev_dbg(&adap->dev, "Transaction (post): STS=%02x, TYP=%02x, "
326 "CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
327 inb_p(SMBHSTSTS), inb_p(SMBHSTTYP), inb_p(SMBHSTCMD),
328 inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1));
330 /* take consequent actions for error conditions */
331 if (!(temp & ALI1535_STS_DONE)) {
332 /* issue "kill" to reset host controller */
333 outb_p(ALI1535_KILL,SMBHSTTYP);
334 outb_p(0xFF,SMBHSTSTS);
335 } else if (temp & ALI1535_STS_ERR) {
336 /* issue "timeout" to reset all devices on bus */
337 outb_p(ALI1535_T_OUT,SMBHSTTYP);
338 outb_p(0xFF,SMBHSTSTS);
344 /* Return -1 on error. */
345 static s32 ali1535_access(struct i2c_adapter *adap, u16 addr,
346 unsigned short flags, char read_write, u8 command,
347 int size, union i2c_smbus_data *data)
354 down(&i2c_ali1535_sem);
355 /* make sure SMBus is idle */
356 temp = inb_p(SMBHSTSTS);
358 (timeout < MAX_TIMEOUT) && !(temp & ALI1535_STS_IDLE);
361 temp = inb_p(SMBHSTSTS);
363 if (timeout >= MAX_TIMEOUT)
364 dev_warn(&adap->dev, "Idle wait Timeout! STS=0x%02x\n", temp);
366 /* clear status register (clear-on-write) */
367 outb_p(0xFF, SMBHSTSTS);
370 case I2C_SMBUS_PROC_CALL:
371 dev_err(&adap->dev, "I2C_SMBUS_PROC_CALL not supported!\n");
374 case I2C_SMBUS_QUICK:
375 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
377 size = ALI1535_QUICK;
378 outb_p(size, SMBHSTTYP); /* output command */
381 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
384 outb_p(size, SMBHSTTYP); /* output command */
385 if (read_write == I2C_SMBUS_WRITE)
386 outb_p(command, SMBHSTCMD);
388 case I2C_SMBUS_BYTE_DATA:
389 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
391 size = ALI1535_BYTE_DATA;
392 outb_p(size, SMBHSTTYP); /* output command */
393 outb_p(command, SMBHSTCMD);
394 if (read_write == I2C_SMBUS_WRITE)
395 outb_p(data->byte, SMBHSTDAT0);
397 case I2C_SMBUS_WORD_DATA:
398 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
400 size = ALI1535_WORD_DATA;
401 outb_p(size, SMBHSTTYP); /* output command */
402 outb_p(command, SMBHSTCMD);
403 if (read_write == I2C_SMBUS_WRITE) {
404 outb_p(data->word & 0xff, SMBHSTDAT0);
405 outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
408 case I2C_SMBUS_BLOCK_DATA:
409 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
411 size = ALI1535_BLOCK_DATA;
412 outb_p(size, SMBHSTTYP); /* output command */
413 outb_p(command, SMBHSTCMD);
414 if (read_write == I2C_SMBUS_WRITE) {
415 len = data->block[0];
418 data->block[0] = len;
422 data->block[0] = len;
424 outb_p(len, SMBHSTDAT0);
425 /* Reset SMBBLKDAT */
426 outb_p(inb_p(SMBHSTTYP) | ALI1535_BLOCK_CLR, SMBHSTTYP);
427 for (i = 1; i <= len; i++)
428 outb_p(data->block[i], SMBBLKDAT);
433 if (ali1535_transaction(adap)) {
434 /* Error in transaction */
439 if ((read_write == I2C_SMBUS_WRITE) || (size == ALI1535_QUICK)) {
445 case ALI1535_BYTE: /* Result put in SMBHSTDAT0 */
446 data->byte = inb_p(SMBHSTDAT0);
448 case ALI1535_BYTE_DATA:
449 data->byte = inb_p(SMBHSTDAT0);
451 case ALI1535_WORD_DATA:
452 data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
454 case ALI1535_BLOCK_DATA:
455 len = inb_p(SMBHSTDAT0);
458 data->block[0] = len;
459 /* Reset SMBBLKDAT */
460 outb_p(inb_p(SMBHSTTYP) | ALI1535_BLOCK_CLR, SMBHSTTYP);
461 for (i = 1; i <= data->block[0]; i++) {
462 data->block[i] = inb_p(SMBBLKDAT);
463 dev_dbg(&adap->dev, "Blk: len=%d, i=%d, data=%02x\n",
464 len, i, data->block[i]);
469 up(&i2c_ali1535_sem);
474 u32 ali1535_func(struct i2c_adapter *adapter)
476 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
477 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
478 I2C_FUNC_SMBUS_BLOCK_DATA;
481 static struct i2c_algorithm smbus_algorithm = {
482 .name = "Non-i2c SMBus adapter",
483 .id = I2C_ALGO_SMBUS,
484 .smbus_xfer = ali1535_access,
485 .functionality = ali1535_func,
488 static struct i2c_adapter ali1535_adapter = {
489 .owner = THIS_MODULE,
490 .id = I2C_ALGO_SMBUS | I2C_HW_SMBUS_ALI1535,
491 .algo = &smbus_algorithm,
497 static struct pci_device_id ali1535_ids[] __devinitdata = {
499 .vendor = PCI_VENDOR_ID_AL,
500 .device = PCI_DEVICE_ID_AL_M7101,
501 .subvendor = PCI_ANY_ID,
502 .subdevice = PCI_ANY_ID,
507 static int __devinit ali1535_probe(struct pci_dev *dev, const struct pci_device_id *id)
509 if (ali1535_setup(dev)) {
511 "ALI1535 not detected, module not inserted.\n");
515 /* set up the driverfs linkage to our parent device */
516 ali1535_adapter.dev.parent = &dev->dev;
518 snprintf(ali1535_adapter.dev.name, DEVICE_NAME_SIZE,
519 "SMBus ALI1535 adapter at %04x", ali1535_smba);
520 return i2c_add_adapter(&ali1535_adapter);
523 static void __devexit ali1535_remove(struct pci_dev *dev)
525 i2c_del_adapter(&ali1535_adapter);
528 static struct pci_driver ali1535_driver = {
529 .name = "ali1535_smbus",
530 .id_table = ali1535_ids,
531 .probe = ali1535_probe,
532 .remove = __devexit_p(ali1535_remove),
535 static int __init i2c_ali1535_init(void)
537 printk(KERN_INFO "i2c-ali1535 version %s (%s)\n", I2C_VERSION, I2C_DATE);
538 return pci_module_init(&ali1535_driver);
541 static void __exit i2c_ali1535_exit(void)
543 pci_unregister_driver(&ali1535_driver);
544 release_region(ali1535_smba, ALI1535_SMB_IOSIZE);
547 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
548 "Philip Edelbrock <phil@netroedge.com>, "
549 "Mark D. Studebaker <mdsxyz123@yahoo.com> "
550 "and Dan Eaton <dan.eaton@rocketlogix.com>");
551 MODULE_DESCRIPTION("ALI1535 SMBus driver");
552 MODULE_LICENSE("GPL");
554 module_init(i2c_ali1535_init);
555 module_exit(i2c_ali1535_exit);