2 * i2c-ali1563.c - i2c driver for the ALi 1563 Southbridge
4 * Copyright (C) 2004 Patrick Mochel
6 * The 1563 southbridge is deceptively similar to the 1533, with a
7 * few notable exceptions. One of those happens to be the fact they
8 * upgraded the i2c core to be 2.0 compliant, and happens to be almost
9 * identical to the i2c controller found in the Intel 801 south
12 * This driver is based on a mix of the 15x3, 1535, and i801 drivers,
13 * with a little help from the ALi 1563 spec.
15 * This file is released under the GPLv2
18 #include <linux/module.h>
19 #include <linux/delay.h>
20 #include <linux/i2c.h>
21 #include <linux/pci.h>
22 #include <linux/init.h>
24 #define ALI1563_MAX_TIMEOUT 500
25 #define ALI1563_SMBBA 0x80
26 #define ALI1563_SMB_IOEN 1
27 #define ALI1563_SMB_HOSTEN 2
28 #define ALI1563_SMB_IOSIZE 16
30 #define SMB_HST_STS (ali1563_smba + 0)
31 #define SMB_HST_CNTL1 (ali1563_smba + 1)
32 #define SMB_HST_CNTL2 (ali1563_smba + 2)
33 #define SMB_HST_CMD (ali1563_smba + 3)
34 #define SMB_HST_ADD (ali1563_smba + 4)
35 #define SMB_HST_DAT0 (ali1563_smba + 5)
36 #define SMB_HST_DAT1 (ali1563_smba + 6)
37 #define SMB_BLK_DAT (ali1563_smba + 7)
39 #define HST_STS_BUSY 0x01
40 #define HST_STS_INTR 0x02
41 #define HST_STS_DEVERR 0x04
42 #define HST_STS_BUSERR 0x08
43 #define HST_STS_FAIL 0x10
44 #define HST_STS_DONE 0x80
45 #define HST_STS_BAD 0x1c
48 #define HST_CNTL1_TIMEOUT 0x80
49 #define HST_CNTL1_LAST 0x40
51 #define HST_CNTL2_KILL 0x04
52 #define HST_CNTL2_START 0x40
53 #define HST_CNTL2_QUICK 0x00
54 #define HST_CNTL2_BYTE 0x01
55 #define HST_CNTL2_BYTE_DATA 0x02
56 #define HST_CNTL2_WORD_DATA 0x03
57 #define HST_CNTL2_BLOCK 0x05
61 static unsigned short ali1563_smba;
63 static int ali1563_transaction(struct i2c_adapter * a)
68 dev_dbg(&a->dev, "Transaction (pre): STS=%02x, CNTL1=%02x, "
69 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
70 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
71 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
74 data = inb_p(SMB_HST_STS);
75 if (data & HST_STS_BAD) {
76 dev_warn(&a->dev,"ali1563: Trying to reset busy device\n");
77 outb_p(data | HST_STS_BAD,SMB_HST_STS);
78 data = inb_p(SMB_HST_STS);
79 if (data & HST_STS_BAD)
82 outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_START, SMB_HST_CNTL2);
84 timeout = ALI1563_MAX_TIMEOUT;
87 while (((data = inb_p(SMB_HST_STS)) & HST_STS_BUSY) && --timeout);
89 dev_dbg(&a->dev, "Transaction (post): STS=%02x, CNTL1=%02x, "
90 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
91 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
92 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
95 if (timeout && !(data & HST_STS_BAD))
97 dev_warn(&a->dev, "SMBus Error: %s%s%s%s%s\n",
98 timeout ? "Timeout " : "",
99 data & HST_STS_FAIL ? "Transaction Failed " : "",
100 data & HST_STS_BUSERR ? "No response or Bus Collision " : "",
101 data & HST_STS_DEVERR ? "Device Error " : "",
102 !(data & HST_STS_DONE) ? "Transaction Never Finished " : "");
104 if (!(data & HST_STS_DONE))
105 /* Issue 'kill' to host controller */
106 outb_p(HST_CNTL2_KILL,SMB_HST_CNTL2);
108 /* Issue timeout to reset all devices on bus */
109 outb_p(HST_CNTL1_TIMEOUT,SMB_HST_CNTL1);
113 static int ali1563_block_start(struct i2c_adapter * a)
118 dev_dbg(&a->dev, "Block (pre): STS=%02x, CNTL1=%02x, "
119 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
120 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
121 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
122 inb_p(SMB_HST_DAT1));
124 data = inb_p(SMB_HST_STS);
125 if (data & HST_STS_BAD) {
126 dev_warn(&a->dev,"ali1563: Trying to reset busy device\n");
127 outb_p(data | HST_STS_BAD,SMB_HST_STS);
128 data = inb_p(SMB_HST_STS);
129 if (data & HST_STS_BAD)
133 /* Clear byte-ready bit */
134 outb_p(data | HST_STS_DONE, SMB_HST_STS);
136 /* Start transaction and wait for byte-ready bit to be set */
137 outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_START, SMB_HST_CNTL2);
139 timeout = ALI1563_MAX_TIMEOUT;
142 while (!((data = inb_p(SMB_HST_STS)) & HST_STS_DONE) && --timeout);
144 dev_dbg(&a->dev, "Block (post): STS=%02x, CNTL1=%02x, "
145 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
146 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
147 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
148 inb_p(SMB_HST_DAT1));
150 if (timeout && !(data & HST_STS_BAD))
152 dev_warn(&a->dev, "SMBus Error: %s%s%s%s%s\n",
153 timeout ? "Timeout " : "",
154 data & HST_STS_FAIL ? "Transaction Failed " : "",
155 data & HST_STS_BUSERR ? "No response or Bus Collision " : "",
156 data & HST_STS_DEVERR ? "Device Error " : "",
157 !(data & HST_STS_DONE) ? "Transaction Never Finished " : "");
161 static int ali1563_block(struct i2c_adapter * a, union i2c_smbus_data * data, u8 rw)
166 /* Do we need this? */
167 outb_p(HST_CNTL1_LAST,SMB_HST_CNTL1);
169 if (rw == I2C_SMBUS_WRITE) {
170 len = data->block[0];
175 outb_p(len,SMB_HST_DAT0);
176 outb_p(data->block[1],SMB_BLK_DAT);
180 outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_BLOCK, SMB_HST_CNTL2);
182 for (i = 0; i < len; i++) {
183 if (rw == I2C_SMBUS_WRITE) {
184 outb_p(data->block[i + 1], SMB_BLK_DAT);
185 if ((error = ali1563_block_start(a)))
188 if ((error = ali1563_block_start(a)))
191 len = inb_p(SMB_HST_DAT0);
197 data->block[i+1] = inb_p(SMB_BLK_DAT);
200 /* Do we need this? */
201 outb_p(HST_CNTL1_LAST,SMB_HST_CNTL1);
205 static s32 ali1563_access(struct i2c_adapter * a, u16 addr,
206 unsigned short flags, char rw, u8 cmd,
207 int size, union i2c_smbus_data * data)
213 for (timeout = ALI1563_MAX_TIMEOUT; timeout; timeout--) {
214 if (!(reg = inb_p(SMB_HST_STS) & HST_STS_BUSY))
218 dev_warn(&a->dev,"SMBus not idle. HST_STS = %02x\n",reg);
219 outb_p(0xff,SMB_HST_STS);
221 /* Map the size to what the chip understands */
223 case I2C_SMBUS_PROC_CALL:
224 dev_err(&a->dev, "I2C_SMBUS_PROC_CALL not supported!\n");
227 case I2C_SMBUS_QUICK:
228 size = HST_CNTL2_QUICK;
231 size = HST_CNTL2_BYTE;
233 case I2C_SMBUS_BYTE_DATA:
234 size = HST_CNTL2_BYTE_DATA;
236 case I2C_SMBUS_WORD_DATA:
237 size = HST_CNTL2_WORD_DATA;
239 case I2C_SMBUS_BLOCK_DATA:
240 size = HST_CNTL2_BLOCK;
244 outb_p(((addr & 0x7f) << 1) | (rw & 0x01), SMB_HST_ADD);
245 outb_p(inb_p(SMB_HST_CNTL2) | (size << 3), SMB_HST_CNTL2);
247 /* Write the command register */
250 if (rw== I2C_SMBUS_WRITE)
251 outb_p(cmd, SMB_HST_CMD);
253 case HST_CNTL2_BYTE_DATA:
254 outb_p(cmd, SMB_HST_CMD);
255 if (rw == I2C_SMBUS_WRITE)
256 outb_p(data->byte, SMB_HST_DAT0);
258 case HST_CNTL2_WORD_DATA:
259 outb_p(cmd, SMB_HST_CMD);
260 if (rw == I2C_SMBUS_WRITE) {
261 outb_p(data->word & 0xff, SMB_HST_DAT0);
262 outb_p((data->word & 0xff00) >> 8, SMB_HST_DAT1);
265 case HST_CNTL2_BLOCK:
266 outb_p(cmd, SMB_HST_CMD);
267 error = ali1563_block(a,data,rw);
271 if ((error = ali1563_transaction(a)))
274 if ((rw == I2C_SMBUS_WRITE) || (size == HST_CNTL2_QUICK))
278 case HST_CNTL2_BYTE: /* Result put in SMBHSTDAT0 */
279 data->byte = inb_p(SMB_HST_DAT0);
281 case HST_CNTL2_BYTE_DATA:
282 data->byte = inb_p(SMB_HST_DAT0);
284 case HST_CNTL2_WORD_DATA:
285 data->word = inb_p(SMB_HST_DAT0) + (inb_p(SMB_HST_DAT1) << 8);
292 static u32 ali1563_func(struct i2c_adapter * a)
294 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
295 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
296 I2C_FUNC_SMBUS_BLOCK_DATA;
300 static void ali1563_enable(struct pci_dev * dev)
304 pci_read_config_word(dev,ALI1563_SMBBA,&ctrl);
306 pci_write_config_word(dev,ALI1563_SMBBA,ctrl);
309 static int __devinit ali1563_setup(struct pci_dev * dev)
313 pci_read_config_word(dev,ALI1563_SMBBA,&ctrl);
314 printk("ali1563: SMBus control = %04x\n",ctrl);
316 /* Check if device is even enabled first */
317 if (!(ctrl & ALI1563_SMB_IOEN)) {
318 dev_warn(&dev->dev,"I/O space not enabled, trying manually\n");
321 if (!(ctrl & ALI1563_SMB_IOEN)) {
322 dev_warn(&dev->dev,"I/O space still not enabled, giving up\n");
325 if (!(ctrl & ALI1563_SMB_HOSTEN)) {
326 dev_warn(&dev->dev,"Host Controller not enabled\n");
330 /* SMB I/O Base in high 12 bits and must be aligned with the
331 * size of the I/O space. */
332 ali1563_smba = ctrl & ~(ALI1563_SMB_IOSIZE - 1);
334 dev_warn(&dev->dev,"ali1563_smba Uninitialized\n");
337 if (!request_region(ali1563_smba,ALI1563_SMB_IOSIZE,"i2c-ali1563")) {
338 dev_warn(&dev->dev,"Could not allocate I/O space");
347 static void ali1563_shutdown(struct pci_dev *dev)
349 release_region(ali1563_smba,ALI1563_SMB_IOSIZE);
352 static struct i2c_algorithm ali1563_algorithm = {
353 .name = "Non-i2c SMBus adapter",
354 .id = I2C_ALGO_SMBUS,
355 .smbus_xfer = ali1563_access,
356 .functionality = ali1563_func,
359 static struct i2c_adapter ali1563_adapter = {
360 .owner = THIS_MODULE,
361 .class = I2C_CLASS_HWMON,
362 .algo = &ali1563_algorithm,
365 static int __devinit ali1563_probe(struct pci_dev * dev,
366 const struct pci_device_id * id_table)
370 if ((error = ali1563_setup(dev)))
372 ali1563_adapter.dev.parent = &dev->dev;
373 sprintf(ali1563_adapter.name,"SMBus ALi 1563 Adapter @ %04x",
375 if ((error = i2c_add_adapter(&ali1563_adapter)))
376 ali1563_shutdown(dev);
377 printk("%s: Returning %d\n",__FUNCTION__,error);
381 static void __devexit ali1563_remove(struct pci_dev * dev)
383 i2c_del_adapter(&ali1563_adapter);
384 ali1563_shutdown(dev);
387 static struct pci_device_id __devinitdata ali1563_id_table[] = {
388 { PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1563) },
392 MODULE_DEVICE_TABLE (pci, ali1563_id_table);
394 static struct pci_driver ali1563_pci_driver = {
395 .name = "ali1563_i2c",
396 .id_table = ali1563_id_table,
397 .probe = ali1563_probe,
398 .remove = __devexit_p(ali1563_remove),
401 static int __init ali1563_init(void)
403 return pci_register_driver(&ali1563_pci_driver);
406 module_init(ali1563_init);
408 static void __exit ali1563_exit(void)
410 pci_unregister_driver(&ali1563_pci_driver);
413 module_exit(ali1563_exit);
415 MODULE_LICENSE("GPL");