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/acpi.h>
25 #define ALI1563_MAX_TIMEOUT 500
26 #define ALI1563_SMBBA 0x80
27 #define ALI1563_SMB_IOEN 1
28 #define ALI1563_SMB_HOSTEN 2
29 #define ALI1563_SMB_IOSIZE 16
31 #define SMB_HST_STS (ali1563_smba + 0)
32 #define SMB_HST_CNTL1 (ali1563_smba + 1)
33 #define SMB_HST_CNTL2 (ali1563_smba + 2)
34 #define SMB_HST_CMD (ali1563_smba + 3)
35 #define SMB_HST_ADD (ali1563_smba + 4)
36 #define SMB_HST_DAT0 (ali1563_smba + 5)
37 #define SMB_HST_DAT1 (ali1563_smba + 6)
38 #define SMB_BLK_DAT (ali1563_smba + 7)
40 #define HST_STS_BUSY 0x01
41 #define HST_STS_INTR 0x02
42 #define HST_STS_DEVERR 0x04
43 #define HST_STS_BUSERR 0x08
44 #define HST_STS_FAIL 0x10
45 #define HST_STS_DONE 0x80
46 #define HST_STS_BAD 0x1c
49 #define HST_CNTL1_TIMEOUT 0x80
50 #define HST_CNTL1_LAST 0x40
52 #define HST_CNTL2_KILL 0x04
53 #define HST_CNTL2_START 0x40
54 #define HST_CNTL2_QUICK 0x00
55 #define HST_CNTL2_BYTE 0x01
56 #define HST_CNTL2_BYTE_DATA 0x02
57 #define HST_CNTL2_WORD_DATA 0x03
58 #define HST_CNTL2_BLOCK 0x05
61 #define HST_CNTL2_SIZEMASK 0x38
63 static struct pci_driver ali1563_pci_driver;
64 static unsigned short ali1563_smba;
66 static int ali1563_transaction(struct i2c_adapter *a, int size)
72 dev_dbg(&a->dev, "Transaction (pre): STS=%02x, CNTL1=%02x, "
73 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
74 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
75 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
78 data = inb_p(SMB_HST_STS);
79 if (data & HST_STS_BAD) {
80 dev_err(&a->dev, "ali1563: Trying to reset busy device\n");
81 outb_p(data | HST_STS_BAD, SMB_HST_STS);
82 data = inb_p(SMB_HST_STS);
83 if (data & HST_STS_BAD)
86 outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_START, SMB_HST_CNTL2);
88 timeout = ALI1563_MAX_TIMEOUT;
91 } while (((data = inb_p(SMB_HST_STS)) & HST_STS_BUSY) && --timeout);
93 dev_dbg(&a->dev, "Transaction (post): STS=%02x, CNTL1=%02x, "
94 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
95 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
96 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
99 if (timeout && !(data & HST_STS_BAD))
103 dev_err(&a->dev, "Timeout - Trying to KILL transaction!\n");
104 /* Issue 'kill' to host controller */
105 outb_p(HST_CNTL2_KILL, SMB_HST_CNTL2);
106 data = inb_p(SMB_HST_STS);
110 /* device error - no response, ignore the autodetection case */
111 if (data & HST_STS_DEVERR) {
112 if (size != HST_CNTL2_QUICK)
113 dev_err(&a->dev, "Device error!\n");
117 if (data & HST_STS_BUSERR) {
118 dev_err(&a->dev, "Bus collision!\n");
119 /* Issue timeout, hoping it helps */
120 outb_p(HST_CNTL1_TIMEOUT, SMB_HST_CNTL1);
123 if (data & HST_STS_FAIL) {
124 dev_err(&a->dev, "Cleaning fail after KILL!\n");
125 outb_p(0x0, SMB_HST_CNTL2);
131 static int ali1563_block_start(struct i2c_adapter *a)
137 dev_dbg(&a->dev, "Block (pre): STS=%02x, CNTL1=%02x, "
138 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
139 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
140 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
141 inb_p(SMB_HST_DAT1));
143 data = inb_p(SMB_HST_STS);
144 if (data & HST_STS_BAD) {
145 dev_warn(&a->dev, "ali1563: Trying to reset busy device\n");
146 outb_p(data | HST_STS_BAD, SMB_HST_STS);
147 data = inb_p(SMB_HST_STS);
148 if (data & HST_STS_BAD)
152 /* Clear byte-ready bit */
153 outb_p(data | HST_STS_DONE, SMB_HST_STS);
155 /* Start transaction and wait for byte-ready bit to be set */
156 outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_START, SMB_HST_CNTL2);
158 timeout = ALI1563_MAX_TIMEOUT;
161 } while (!((data = inb_p(SMB_HST_STS)) & HST_STS_DONE) && --timeout);
163 dev_dbg(&a->dev, "Block (post): STS=%02x, CNTL1=%02x, "
164 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
165 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
166 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
167 inb_p(SMB_HST_DAT1));
169 if (timeout && !(data & HST_STS_BAD))
175 if (data & HST_STS_DEVERR)
178 dev_err(&a->dev, "SMBus Error: %s%s%s%s%s\n",
179 timeout ? "" : "Timeout ",
180 data & HST_STS_FAIL ? "Transaction Failed " : "",
181 data & HST_STS_BUSERR ? "No response or Bus Collision " : "",
182 data & HST_STS_DEVERR ? "Device Error " : "",
183 !(data & HST_STS_DONE) ? "Transaction Never Finished " : "");
187 static int ali1563_block(struct i2c_adapter *a,
188 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 error = ali1563_block_start(a);
216 error = ali1563_block_start(a);
220 len = inb_p(SMB_HST_DAT0);
226 data->block[i+1] = inb_p(SMB_BLK_DAT);
229 /* Do we need this? */
230 outb_p(HST_CNTL1_LAST, SMB_HST_CNTL1);
234 static s32 ali1563_access(struct i2c_adapter *a, u16 addr,
235 unsigned short flags, char rw, u8 cmd,
236 int size, union i2c_smbus_data *data)
242 for (timeout = ALI1563_MAX_TIMEOUT; timeout; timeout--) {
243 reg = inb_p(SMB_HST_STS);
244 if (!(reg & HST_STS_BUSY))
248 dev_warn(&a->dev, "SMBus not idle. HST_STS = %02x\n", reg);
249 outb_p(0xff, SMB_HST_STS);
251 /* Map the size to what the chip understands */
253 case I2C_SMBUS_QUICK:
254 size = HST_CNTL2_QUICK;
257 size = HST_CNTL2_BYTE;
259 case I2C_SMBUS_BYTE_DATA:
260 size = HST_CNTL2_BYTE_DATA;
262 case I2C_SMBUS_WORD_DATA:
263 size = HST_CNTL2_WORD_DATA;
265 case I2C_SMBUS_BLOCK_DATA:
266 size = HST_CNTL2_BLOCK;
269 dev_warn(&a->dev, "Unsupported transaction %d\n", size);
274 outb_p(((addr & 0x7f) << 1) | (rw & 0x01), SMB_HST_ADD);
275 outb_p((inb_p(SMB_HST_CNTL2) & ~HST_CNTL2_SIZEMASK) |
276 (size << 3), SMB_HST_CNTL2);
278 /* Write the command register */
282 if (rw == I2C_SMBUS_WRITE)
283 /* Beware it uses DAT0 register and not CMD! */
284 outb_p(cmd, SMB_HST_DAT0);
286 case HST_CNTL2_BYTE_DATA:
287 outb_p(cmd, SMB_HST_CMD);
288 if (rw == I2C_SMBUS_WRITE)
289 outb_p(data->byte, SMB_HST_DAT0);
291 case HST_CNTL2_WORD_DATA:
292 outb_p(cmd, SMB_HST_CMD);
293 if (rw == I2C_SMBUS_WRITE) {
294 outb_p(data->word & 0xff, SMB_HST_DAT0);
295 outb_p((data->word & 0xff00) >> 8, SMB_HST_DAT1);
298 case HST_CNTL2_BLOCK:
299 outb_p(cmd, SMB_HST_CMD);
300 error = ali1563_block(a, data, rw);
304 error = ali1563_transaction(a, size);
308 if ((rw == I2C_SMBUS_WRITE) || (size == HST_CNTL2_QUICK))
312 case HST_CNTL2_BYTE: /* Result put in SMBHSTDAT0 */
313 data->byte = inb_p(SMB_HST_DAT0);
315 case HST_CNTL2_BYTE_DATA:
316 data->byte = inb_p(SMB_HST_DAT0);
318 case HST_CNTL2_WORD_DATA:
319 data->word = inb_p(SMB_HST_DAT0) + (inb_p(SMB_HST_DAT1) << 8);
326 static u32 ali1563_func(struct i2c_adapter *a)
328 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
329 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
330 I2C_FUNC_SMBUS_BLOCK_DATA;
334 static int ali1563_setup(struct pci_dev *dev)
338 pci_read_config_word(dev, ALI1563_SMBBA, &ctrl);
340 /* SMB I/O Base in high 12 bits and must be aligned with the
341 * size of the I/O space. */
342 ali1563_smba = ctrl & ~(ALI1563_SMB_IOSIZE - 1);
344 dev_warn(&dev->dev, "ali1563_smba Uninitialized\n");
348 /* Check if device is enabled */
349 if (!(ctrl & ALI1563_SMB_HOSTEN)) {
350 dev_warn(&dev->dev, "Host Controller not enabled\n");
353 if (!(ctrl & ALI1563_SMB_IOEN)) {
354 dev_warn(&dev->dev, "I/O space not enabled, trying manually\n");
355 pci_write_config_word(dev, ALI1563_SMBBA,
356 ctrl | ALI1563_SMB_IOEN);
357 pci_read_config_word(dev, ALI1563_SMBBA, &ctrl);
358 if (!(ctrl & ALI1563_SMB_IOEN)) {
360 "I/O space still not enabled, giving up\n");
365 if (acpi_check_region(ali1563_smba, ALI1563_SMB_IOSIZE,
366 ali1563_pci_driver.name))
369 if (!request_region(ali1563_smba, ALI1563_SMB_IOSIZE,
370 ali1563_pci_driver.name)) {
371 dev_err(&dev->dev, "Could not allocate I/O space at 0x%04x\n",
375 dev_info(&dev->dev, "Found ALi1563 SMBus at 0x%04x\n", ali1563_smba);
382 static void ali1563_shutdown(struct pci_dev *dev)
384 release_region(ali1563_smba, ALI1563_SMB_IOSIZE);
387 static const struct i2c_algorithm ali1563_algorithm = {
388 .smbus_xfer = ali1563_access,
389 .functionality = ali1563_func,
392 static struct i2c_adapter ali1563_adapter = {
393 .owner = THIS_MODULE,
394 .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
395 .algo = &ali1563_algorithm,
398 static int ali1563_probe(struct pci_dev *dev,
399 const struct pci_device_id *id_table)
403 error = ali1563_setup(dev);
406 ali1563_adapter.dev.parent = &dev->dev;
407 snprintf(ali1563_adapter.name, sizeof(ali1563_adapter.name),
408 "SMBus ALi 1563 Adapter @ %04x", ali1563_smba);
409 error = i2c_add_adapter(&ali1563_adapter);
415 ali1563_shutdown(dev);
417 dev_warn(&dev->dev, "ALi1563 SMBus probe failed (%d)\n", error);
421 static void ali1563_remove(struct pci_dev *dev)
423 i2c_del_adapter(&ali1563_adapter);
424 ali1563_shutdown(dev);
427 static const struct pci_device_id ali1563_id_table[] = {
428 { PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1563) },
432 MODULE_DEVICE_TABLE(pci, ali1563_id_table);
434 static struct pci_driver ali1563_pci_driver = {
435 .name = "ali1563_smbus",
436 .id_table = ali1563_id_table,
437 .probe = ali1563_probe,
438 .remove = ali1563_remove,
441 module_pci_driver(ali1563_pci_driver);
443 MODULE_LICENSE("GPL");