2 * i2c-ali1563.c - i2c driver for the ALi 1563 Southbridge
4 * Copyright (C) 2004 Patrick Mochel
5 * 2005 Rudolf Marek <r.marek@assembler.cz>
7 * The 1563 southbridge is deceptively similar to the 1533, with a
8 * few notable exceptions. One of those happens to be the fact they
9 * upgraded the i2c core to be 2.0 compliant, and happens to be almost
10 * identical to the i2c controller found in the Intel 801 south
13 * This driver is based on a mix of the 15x3, 1535, and i801 drivers,
14 * with a little help from the ALi 1563 spec.
16 * This file is released under the GPLv2
19 #include <linux/module.h>
20 #include <linux/delay.h>
21 #include <linux/i2c.h>
22 #include <linux/pci.h>
23 #include <linux/init.h>
24 #include <linux/acpi.h>
26 #define ALI1563_MAX_TIMEOUT 500
27 #define ALI1563_SMBBA 0x80
28 #define ALI1563_SMB_IOEN 1
29 #define ALI1563_SMB_HOSTEN 2
30 #define ALI1563_SMB_IOSIZE 16
32 #define SMB_HST_STS (ali1563_smba + 0)
33 #define SMB_HST_CNTL1 (ali1563_smba + 1)
34 #define SMB_HST_CNTL2 (ali1563_smba + 2)
35 #define SMB_HST_CMD (ali1563_smba + 3)
36 #define SMB_HST_ADD (ali1563_smba + 4)
37 #define SMB_HST_DAT0 (ali1563_smba + 5)
38 #define SMB_HST_DAT1 (ali1563_smba + 6)
39 #define SMB_BLK_DAT (ali1563_smba + 7)
41 #define HST_STS_BUSY 0x01
42 #define HST_STS_INTR 0x02
43 #define HST_STS_DEVERR 0x04
44 #define HST_STS_BUSERR 0x08
45 #define HST_STS_FAIL 0x10
46 #define HST_STS_DONE 0x80
47 #define HST_STS_BAD 0x1c
50 #define HST_CNTL1_TIMEOUT 0x80
51 #define HST_CNTL1_LAST 0x40
53 #define HST_CNTL2_KILL 0x04
54 #define HST_CNTL2_START 0x40
55 #define HST_CNTL2_QUICK 0x00
56 #define HST_CNTL2_BYTE 0x01
57 #define HST_CNTL2_BYTE_DATA 0x02
58 #define HST_CNTL2_WORD_DATA 0x03
59 #define HST_CNTL2_BLOCK 0x05
62 #define HST_CNTL2_SIZEMASK 0x38
64 static struct pci_driver ali1563_pci_driver;
65 static unsigned short ali1563_smba;
67 static int ali1563_transaction(struct i2c_adapter * a, int size)
73 dev_dbg(&a->dev, "Transaction (pre): STS=%02x, CNTL1=%02x, "
74 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
75 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
76 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
79 data = inb_p(SMB_HST_STS);
80 if (data & HST_STS_BAD) {
81 dev_err(&a->dev, "ali1563: Trying to reset busy device\n");
82 outb_p(data | HST_STS_BAD,SMB_HST_STS);
83 data = inb_p(SMB_HST_STS);
84 if (data & HST_STS_BAD)
87 outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_START, SMB_HST_CNTL2);
89 timeout = ALI1563_MAX_TIMEOUT;
92 while (((data = inb_p(SMB_HST_STS)) & HST_STS_BUSY) && --timeout);
94 dev_dbg(&a->dev, "Transaction (post): STS=%02x, CNTL1=%02x, "
95 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
96 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
97 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
100 if (timeout && !(data & HST_STS_BAD))
104 dev_err(&a->dev, "Timeout - Trying to KILL transaction!\n");
105 /* Issue 'kill' to host controller */
106 outb_p(HST_CNTL2_KILL,SMB_HST_CNTL2);
107 data = inb_p(SMB_HST_STS);
111 /* device error - no response, ignore the autodetection case */
112 if (data & HST_STS_DEVERR) {
113 if (size != HST_CNTL2_QUICK)
114 dev_err(&a->dev, "Device error!\n");
118 if (data & HST_STS_BUSERR) {
119 dev_err(&a->dev, "Bus collision!\n");
120 /* Issue timeout, hoping it helps */
121 outb_p(HST_CNTL1_TIMEOUT,SMB_HST_CNTL1);
124 if (data & HST_STS_FAIL) {
125 dev_err(&a->dev, "Cleaning fail after KILL!\n");
126 outb_p(0x0,SMB_HST_CNTL2);
132 static int ali1563_block_start(struct i2c_adapter * a)
138 dev_dbg(&a->dev, "Block (pre): STS=%02x, CNTL1=%02x, "
139 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
140 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
141 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
142 inb_p(SMB_HST_DAT1));
144 data = inb_p(SMB_HST_STS);
145 if (data & HST_STS_BAD) {
146 dev_warn(&a->dev,"ali1563: Trying to reset busy device\n");
147 outb_p(data | HST_STS_BAD,SMB_HST_STS);
148 data = inb_p(SMB_HST_STS);
149 if (data & HST_STS_BAD)
153 /* Clear byte-ready bit */
154 outb_p(data | HST_STS_DONE, SMB_HST_STS);
156 /* Start transaction and wait for byte-ready bit to be set */
157 outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_START, SMB_HST_CNTL2);
159 timeout = ALI1563_MAX_TIMEOUT;
162 while (!((data = inb_p(SMB_HST_STS)) & HST_STS_DONE) && --timeout);
164 dev_dbg(&a->dev, "Block (post): STS=%02x, CNTL1=%02x, "
165 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
166 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
167 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
168 inb_p(SMB_HST_DAT1));
170 if (timeout && !(data & HST_STS_BAD))
176 if (data & HST_STS_DEVERR)
179 dev_err(&a->dev, "SMBus Error: %s%s%s%s%s\n",
180 timeout ? "" : "Timeout ",
181 data & HST_STS_FAIL ? "Transaction Failed " : "",
182 data & HST_STS_BUSERR ? "No response or Bus Collision " : "",
183 data & HST_STS_DEVERR ? "Device Error " : "",
184 !(data & HST_STS_DONE) ? "Transaction Never Finished " : "");
188 static int ali1563_block(struct i2c_adapter * a, union i2c_smbus_data * data, u8 rw)
193 /* Do we need this? */
194 outb_p(HST_CNTL1_LAST,SMB_HST_CNTL1);
196 if (rw == I2C_SMBUS_WRITE) {
197 len = data->block[0];
202 outb_p(len,SMB_HST_DAT0);
203 outb_p(data->block[1],SMB_BLK_DAT);
207 outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_BLOCK, SMB_HST_CNTL2);
209 for (i = 0; i < len; i++) {
210 if (rw == I2C_SMBUS_WRITE) {
211 outb_p(data->block[i + 1], SMB_BLK_DAT);
212 if ((error = ali1563_block_start(a)))
215 if ((error = ali1563_block_start(a)))
218 len = inb_p(SMB_HST_DAT0);
224 data->block[i+1] = inb_p(SMB_BLK_DAT);
227 /* Do we need this? */
228 outb_p(HST_CNTL1_LAST,SMB_HST_CNTL1);
232 static s32 ali1563_access(struct i2c_adapter * a, u16 addr,
233 unsigned short flags, char rw, u8 cmd,
234 int size, union i2c_smbus_data * data)
240 for (timeout = ALI1563_MAX_TIMEOUT; timeout; timeout--) {
241 if (!(reg = inb_p(SMB_HST_STS) & HST_STS_BUSY))
245 dev_warn(&a->dev,"SMBus not idle. HST_STS = %02x\n",reg);
246 outb_p(0xff,SMB_HST_STS);
248 /* Map the size to what the chip understands */
250 case I2C_SMBUS_QUICK:
251 size = HST_CNTL2_QUICK;
254 size = HST_CNTL2_BYTE;
256 case I2C_SMBUS_BYTE_DATA:
257 size = HST_CNTL2_BYTE_DATA;
259 case I2C_SMBUS_WORD_DATA:
260 size = HST_CNTL2_WORD_DATA;
262 case I2C_SMBUS_BLOCK_DATA:
263 size = HST_CNTL2_BLOCK;
266 dev_warn(&a->dev, "Unsupported transaction %d\n", size);
271 outb_p(((addr & 0x7f) << 1) | (rw & 0x01), SMB_HST_ADD);
272 outb_p((inb_p(SMB_HST_CNTL2) & ~HST_CNTL2_SIZEMASK) | (size << 3), SMB_HST_CNTL2);
274 /* Write the command register */
278 if (rw== I2C_SMBUS_WRITE)
279 /* Beware it uses DAT0 register and not CMD! */
280 outb_p(cmd, SMB_HST_DAT0);
282 case HST_CNTL2_BYTE_DATA:
283 outb_p(cmd, SMB_HST_CMD);
284 if (rw == I2C_SMBUS_WRITE)
285 outb_p(data->byte, SMB_HST_DAT0);
287 case HST_CNTL2_WORD_DATA:
288 outb_p(cmd, SMB_HST_CMD);
289 if (rw == I2C_SMBUS_WRITE) {
290 outb_p(data->word & 0xff, SMB_HST_DAT0);
291 outb_p((data->word & 0xff00) >> 8, SMB_HST_DAT1);
294 case HST_CNTL2_BLOCK:
295 outb_p(cmd, SMB_HST_CMD);
296 error = ali1563_block(a,data,rw);
300 if ((error = ali1563_transaction(a, size)))
303 if ((rw == I2C_SMBUS_WRITE) || (size == HST_CNTL2_QUICK))
307 case HST_CNTL2_BYTE: /* Result put in SMBHSTDAT0 */
308 data->byte = inb_p(SMB_HST_DAT0);
310 case HST_CNTL2_BYTE_DATA:
311 data->byte = inb_p(SMB_HST_DAT0);
313 case HST_CNTL2_WORD_DATA:
314 data->word = inb_p(SMB_HST_DAT0) + (inb_p(SMB_HST_DAT1) << 8);
321 static u32 ali1563_func(struct i2c_adapter * a)
323 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
324 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
325 I2C_FUNC_SMBUS_BLOCK_DATA;
329 static int __devinit ali1563_setup(struct pci_dev * dev)
333 pci_read_config_word(dev,ALI1563_SMBBA,&ctrl);
335 /* SMB I/O Base in high 12 bits and must be aligned with the
336 * size of the I/O space. */
337 ali1563_smba = ctrl & ~(ALI1563_SMB_IOSIZE - 1);
339 dev_warn(&dev->dev,"ali1563_smba Uninitialized\n");
343 /* Check if device is enabled */
344 if (!(ctrl & ALI1563_SMB_HOSTEN)) {
345 dev_warn(&dev->dev, "Host Controller not enabled\n");
348 if (!(ctrl & ALI1563_SMB_IOEN)) {
349 dev_warn(&dev->dev, "I/O space not enabled, trying manually\n");
350 pci_write_config_word(dev, ALI1563_SMBBA,
351 ctrl | ALI1563_SMB_IOEN);
352 pci_read_config_word(dev, ALI1563_SMBBA, &ctrl);
353 if (!(ctrl & ALI1563_SMB_IOEN)) {
354 dev_err(&dev->dev, "I/O space still not enabled, "
360 if (acpi_check_region(ali1563_smba, ALI1563_SMB_IOSIZE,
361 ali1563_pci_driver.name))
364 if (!request_region(ali1563_smba, ALI1563_SMB_IOSIZE,
365 ali1563_pci_driver.name)) {
366 dev_err(&dev->dev, "Could not allocate I/O space at 0x%04x\n",
370 dev_info(&dev->dev, "Found ALi1563 SMBus at 0x%04x\n", ali1563_smba);
377 static void ali1563_shutdown(struct pci_dev *dev)
379 release_region(ali1563_smba,ALI1563_SMB_IOSIZE);
382 static const struct i2c_algorithm ali1563_algorithm = {
383 .smbus_xfer = ali1563_access,
384 .functionality = ali1563_func,
387 static struct i2c_adapter ali1563_adapter = {
388 .owner = THIS_MODULE,
389 .id = I2C_HW_SMBUS_ALI1563,
390 .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
391 .algo = &ali1563_algorithm,
394 static int __devinit ali1563_probe(struct pci_dev * dev,
395 const struct pci_device_id * id_table)
399 if ((error = ali1563_setup(dev)))
401 ali1563_adapter.dev.parent = &dev->dev;
402 snprintf(ali1563_adapter.name, sizeof(ali1563_adapter.name),
403 "SMBus ALi 1563 Adapter @ %04x", ali1563_smba);
404 if ((error = i2c_add_adapter(&ali1563_adapter)))
409 ali1563_shutdown(dev);
411 dev_warn(&dev->dev, "ALi1563 SMBus probe failed (%d)\n", error);
415 static void __devexit ali1563_remove(struct pci_dev * dev)
417 i2c_del_adapter(&ali1563_adapter);
418 ali1563_shutdown(dev);
421 static struct pci_device_id __devinitdata ali1563_id_table[] = {
422 { PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1563) },
426 MODULE_DEVICE_TABLE (pci, ali1563_id_table);
428 static struct pci_driver ali1563_pci_driver = {
429 .name = "ali1563_smbus",
430 .id_table = ali1563_id_table,
431 .probe = ali1563_probe,
432 .remove = __devexit_p(ali1563_remove),
435 static int __init ali1563_init(void)
437 return pci_register_driver(&ali1563_pci_driver);
440 module_init(ali1563_init);
442 static void __exit ali1563_exit(void)
444 pci_unregister_driver(&ali1563_pci_driver);
447 module_exit(ali1563_exit);
449 MODULE_LICENSE("GPL");