Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[wrt350n-kernel.git] / drivers / i2c / busses / i2c-amd756.c
blob244476f44b16cbb90935be3b2fa9f0ceafec3c35
1 /*
2 amd756.c - Part of lm_sensors, Linux kernel modules for hardware
3 monitoring
5 Copyright (c) 1999-2002 Merlin Hughes <merlin@merlin.org>
7 Shamelessly ripped from i2c-piix4.c:
9 Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
10 Philip Edelbrock <phil@netroedge.com>
12 This program is free software; you can redistribute it and/or modify
13 it under the terms of the GNU General Public License as published by
14 the Free Software Foundation; either version 2 of the License, or
15 (at your option) any later version.
17 This program is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 GNU General Public License for more details.
22 You should have received a copy of the GNU General Public License
23 along with this program; if not, write to the Free Software
24 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 2002-04-08: Added nForce support. (Csaba Halasz)
29 2002-10-03: Fixed nForce PnP I/O port. (Michael Steil)
30 2002-12-28: Rewritten into something that resembles a Linux driver (hch)
31 2003-11-29: Added back AMD8111 removed by the previous rewrite.
32 (Philip Pokorny)
36 Supports AMD756, AMD766, AMD768, AMD8111 and nVidia nForce
37 Note: we assume there can only be one device, with one SMBus interface.
40 #include <linux/module.h>
41 #include <linux/pci.h>
42 #include <linux/kernel.h>
43 #include <linux/delay.h>
44 #include <linux/stddef.h>
45 #include <linux/ioport.h>
46 #include <linux/i2c.h>
47 #include <linux/init.h>
48 #include <asm/io.h>
50 /* AMD756 SMBus address offsets */
51 #define SMB_ADDR_OFFSET 0xE0
52 #define SMB_IOSIZE 16
53 #define SMB_GLOBAL_STATUS (0x0 + amd756_ioport)
54 #define SMB_GLOBAL_ENABLE (0x2 + amd756_ioport)
55 #define SMB_HOST_ADDRESS (0x4 + amd756_ioport)
56 #define SMB_HOST_DATA (0x6 + amd756_ioport)
57 #define SMB_HOST_COMMAND (0x8 + amd756_ioport)
58 #define SMB_HOST_BLOCK_DATA (0x9 + amd756_ioport)
59 #define SMB_HAS_DATA (0xA + amd756_ioport)
60 #define SMB_HAS_DEVICE_ADDRESS (0xC + amd756_ioport)
61 #define SMB_HAS_HOST_ADDRESS (0xE + amd756_ioport)
62 #define SMB_SNOOP_ADDRESS (0xF + amd756_ioport)
64 /* PCI Address Constants */
66 /* address of I/O space */
67 #define SMBBA 0x058 /* mh */
68 #define SMBBANFORCE 0x014
70 /* general configuration */
71 #define SMBGCFG 0x041 /* mh */
73 /* silicon revision code */
74 #define SMBREV 0x008
76 /* Other settings */
77 #define MAX_TIMEOUT 500
79 /* AMD756 constants */
80 #define AMD756_QUICK 0x00
81 #define AMD756_BYTE 0x01
82 #define AMD756_BYTE_DATA 0x02
83 #define AMD756_WORD_DATA 0x03
84 #define AMD756_PROCESS_CALL 0x04
85 #define AMD756_BLOCK_DATA 0x05
87 static struct pci_driver amd756_driver;
88 static unsigned short amd756_ioport;
90 /*
91 SMBUS event = I/O 28-29 bit 11
92 see E0 for the status bits and enabled in E2
95 #define GS_ABRT_STS (1 << 0)
96 #define GS_COL_STS (1 << 1)
97 #define GS_PRERR_STS (1 << 2)
98 #define GS_HST_STS (1 << 3)
99 #define GS_HCYC_STS (1 << 4)
100 #define GS_TO_STS (1 << 5)
101 #define GS_SMB_STS (1 << 11)
103 #define GS_CLEAR_STS (GS_ABRT_STS | GS_COL_STS | GS_PRERR_STS | \
104 GS_HCYC_STS | GS_TO_STS )
106 #define GE_CYC_TYPE_MASK (7)
107 #define GE_HOST_STC (1 << 3)
108 #define GE_ABORT (1 << 5)
111 static int amd756_transaction(struct i2c_adapter *adap)
113 int temp;
114 int result = 0;
115 int timeout = 0;
117 dev_dbg(&adap->dev, "Transaction (pre): GS=%04x, GE=%04x, ADD=%04x, "
118 "DAT=%04x\n", inw_p(SMB_GLOBAL_STATUS),
119 inw_p(SMB_GLOBAL_ENABLE), inw_p(SMB_HOST_ADDRESS),
120 inb_p(SMB_HOST_DATA));
122 /* Make sure the SMBus host is ready to start transmitting */
123 if ((temp = inw_p(SMB_GLOBAL_STATUS)) & (GS_HST_STS | GS_SMB_STS)) {
124 dev_dbg(&adap->dev, "SMBus busy (%04x). Waiting...\n", temp);
125 do {
126 msleep(1);
127 temp = inw_p(SMB_GLOBAL_STATUS);
128 } while ((temp & (GS_HST_STS | GS_SMB_STS)) &&
129 (timeout++ < MAX_TIMEOUT));
130 /* If the SMBus is still busy, we give up */
131 if (timeout >= MAX_TIMEOUT) {
132 dev_dbg(&adap->dev, "Busy wait timeout (%04x)\n", temp);
133 goto abort;
135 timeout = 0;
138 /* start the transaction by setting the start bit */
139 outw_p(inw(SMB_GLOBAL_ENABLE) | GE_HOST_STC, SMB_GLOBAL_ENABLE);
141 /* We will always wait for a fraction of a second! */
142 do {
143 msleep(1);
144 temp = inw_p(SMB_GLOBAL_STATUS);
145 } while ((temp & GS_HST_STS) && (timeout++ < MAX_TIMEOUT));
147 /* If the SMBus is still busy, we give up */
148 if (timeout >= MAX_TIMEOUT) {
149 dev_dbg(&adap->dev, "Completion timeout!\n");
150 goto abort;
153 if (temp & GS_PRERR_STS) {
154 result = -1;
155 dev_dbg(&adap->dev, "SMBus Protocol error (no response)!\n");
158 if (temp & GS_COL_STS) {
159 result = -1;
160 dev_warn(&adap->dev, "SMBus collision!\n");
163 if (temp & GS_TO_STS) {
164 result = -1;
165 dev_dbg(&adap->dev, "SMBus protocol timeout!\n");
168 if (temp & GS_HCYC_STS)
169 dev_dbg(&adap->dev, "SMBus protocol success!\n");
171 outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS);
173 #ifdef DEBUG
174 if (((temp = inw_p(SMB_GLOBAL_STATUS)) & GS_CLEAR_STS) != 0x00) {
175 dev_dbg(&adap->dev,
176 "Failed reset at end of transaction (%04x)\n", temp);
178 #endif
180 dev_dbg(&adap->dev,
181 "Transaction (post): GS=%04x, GE=%04x, ADD=%04x, DAT=%04x\n",
182 inw_p(SMB_GLOBAL_STATUS), inw_p(SMB_GLOBAL_ENABLE),
183 inw_p(SMB_HOST_ADDRESS), inb_p(SMB_HOST_DATA));
185 return result;
187 abort:
188 dev_warn(&adap->dev, "Sending abort\n");
189 outw_p(inw(SMB_GLOBAL_ENABLE) | GE_ABORT, SMB_GLOBAL_ENABLE);
190 msleep(100);
191 outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS);
192 return -1;
195 /* Return -1 on error. */
196 static s32 amd756_access(struct i2c_adapter * adap, u16 addr,
197 unsigned short flags, char read_write,
198 u8 command, int size, union i2c_smbus_data * data)
200 int i, len;
202 /** TODO: Should I supporte the 10-bit transfers? */
203 switch (size) {
204 case I2C_SMBUS_PROC_CALL:
205 dev_dbg(&adap->dev, "I2C_SMBUS_PROC_CALL not supported!\n");
206 /* TODO: Well... It is supported, I'm just not sure what to do here... */
207 return -1;
208 case I2C_SMBUS_QUICK:
209 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
210 SMB_HOST_ADDRESS);
211 size = AMD756_QUICK;
212 break;
213 case I2C_SMBUS_BYTE:
214 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
215 SMB_HOST_ADDRESS);
216 if (read_write == I2C_SMBUS_WRITE)
217 outb_p(command, SMB_HOST_DATA);
218 size = AMD756_BYTE;
219 break;
220 case I2C_SMBUS_BYTE_DATA:
221 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
222 SMB_HOST_ADDRESS);
223 outb_p(command, SMB_HOST_COMMAND);
224 if (read_write == I2C_SMBUS_WRITE)
225 outw_p(data->byte, SMB_HOST_DATA);
226 size = AMD756_BYTE_DATA;
227 break;
228 case I2C_SMBUS_WORD_DATA:
229 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
230 SMB_HOST_ADDRESS);
231 outb_p(command, SMB_HOST_COMMAND);
232 if (read_write == I2C_SMBUS_WRITE)
233 outw_p(data->word, SMB_HOST_DATA); /* TODO: endian???? */
234 size = AMD756_WORD_DATA;
235 break;
236 case I2C_SMBUS_BLOCK_DATA:
237 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
238 SMB_HOST_ADDRESS);
239 outb_p(command, SMB_HOST_COMMAND);
240 if (read_write == I2C_SMBUS_WRITE) {
241 len = data->block[0];
242 if (len < 0)
243 len = 0;
244 if (len > 32)
245 len = 32;
246 outw_p(len, SMB_HOST_DATA);
247 /* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */
248 for (i = 1; i <= len; i++)
249 outb_p(data->block[i],
250 SMB_HOST_BLOCK_DATA);
252 size = AMD756_BLOCK_DATA;
253 break;
256 /* How about enabling interrupts... */
257 outw_p(size & GE_CYC_TYPE_MASK, SMB_GLOBAL_ENABLE);
259 if (amd756_transaction(adap)) /* Error in transaction */
260 return -1;
262 if ((read_write == I2C_SMBUS_WRITE) || (size == AMD756_QUICK))
263 return 0;
266 switch (size) {
267 case AMD756_BYTE:
268 data->byte = inw_p(SMB_HOST_DATA);
269 break;
270 case AMD756_BYTE_DATA:
271 data->byte = inw_p(SMB_HOST_DATA);
272 break;
273 case AMD756_WORD_DATA:
274 data->word = inw_p(SMB_HOST_DATA); /* TODO: endian???? */
275 break;
276 case AMD756_BLOCK_DATA:
277 data->block[0] = inw_p(SMB_HOST_DATA) & 0x3f;
278 if(data->block[0] > 32)
279 data->block[0] = 32;
280 /* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */
281 for (i = 1; i <= data->block[0]; i++)
282 data->block[i] = inb_p(SMB_HOST_BLOCK_DATA);
283 break;
286 return 0;
289 static u32 amd756_func(struct i2c_adapter *adapter)
291 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
292 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
293 I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_PROC_CALL;
296 static const struct i2c_algorithm smbus_algorithm = {
297 .smbus_xfer = amd756_access,
298 .functionality = amd756_func,
301 struct i2c_adapter amd756_smbus = {
302 .owner = THIS_MODULE,
303 .id = I2C_HW_SMBUS_AMD756,
304 .class = I2C_CLASS_HWMON,
305 .algo = &smbus_algorithm,
308 enum chiptype { AMD756, AMD766, AMD768, NFORCE, AMD8111 };
309 static const char* chipname[] = {
310 "AMD756", "AMD766", "AMD768",
311 "nVidia nForce", "AMD8111",
314 static struct pci_device_id amd756_ids[] = {
315 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_740B),
316 .driver_data = AMD756 },
317 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7413),
318 .driver_data = AMD766 },
319 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_OPUS_7443),
320 .driver_data = AMD768 },
321 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS),
322 .driver_data = AMD8111 },
323 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_SMBUS),
324 .driver_data = NFORCE },
325 { 0, }
328 MODULE_DEVICE_TABLE (pci, amd756_ids);
330 static int __devinit amd756_probe(struct pci_dev *pdev,
331 const struct pci_device_id *id)
333 int nforce = (id->driver_data == NFORCE);
334 int error;
335 u8 temp;
337 /* driver_data might come from user-space, so check it */
338 <<<<<<< HEAD:drivers/i2c/busses/i2c-amd756.c
339 if (id->driver_data > ARRAY_SIZE(chipname))
340 =======
341 if (id->driver_data >= ARRAY_SIZE(chipname))
342 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/i2c/busses/i2c-amd756.c
343 return -EINVAL;
345 if (amd756_ioport) {
346 dev_err(&pdev->dev, "Only one device supported "
347 "(you have a strange motherboard, btw)\n");
348 return -ENODEV;
351 if (nforce) {
352 if (PCI_FUNC(pdev->devfn) != 1)
353 return -ENODEV;
355 pci_read_config_word(pdev, SMBBANFORCE, &amd756_ioport);
356 amd756_ioport &= 0xfffc;
357 } else { /* amd */
358 if (PCI_FUNC(pdev->devfn) != 3)
359 return -ENODEV;
361 pci_read_config_byte(pdev, SMBGCFG, &temp);
362 if ((temp & 128) == 0) {
363 dev_err(&pdev->dev,
364 "Error: SMBus controller I/O not enabled!\n");
365 return -ENODEV;
368 /* Determine the address of the SMBus areas */
369 /* Technically it is a dword but... */
370 pci_read_config_word(pdev, SMBBA, &amd756_ioport);
371 amd756_ioport &= 0xff00;
372 amd756_ioport += SMB_ADDR_OFFSET;
375 if (!request_region(amd756_ioport, SMB_IOSIZE, amd756_driver.name)) {
376 dev_err(&pdev->dev, "SMB region 0x%x already in use!\n",
377 amd756_ioport);
378 return -ENODEV;
381 pci_read_config_byte(pdev, SMBREV, &temp);
382 dev_dbg(&pdev->dev, "SMBREV = 0x%X\n", temp);
383 dev_dbg(&pdev->dev, "AMD756_smba = 0x%X\n", amd756_ioport);
385 /* set up the sysfs linkage to our parent device */
386 amd756_smbus.dev.parent = &pdev->dev;
388 sprintf(amd756_smbus.name, "SMBus %s adapter at %04x",
389 chipname[id->driver_data], amd756_ioport);
391 error = i2c_add_adapter(&amd756_smbus);
392 if (error) {
393 dev_err(&pdev->dev,
394 "Adapter registration failed, module not inserted\n");
395 goto out_err;
398 return 0;
400 out_err:
401 release_region(amd756_ioport, SMB_IOSIZE);
402 return error;
405 static void __devexit amd756_remove(struct pci_dev *dev)
407 i2c_del_adapter(&amd756_smbus);
408 release_region(amd756_ioport, SMB_IOSIZE);
411 static struct pci_driver amd756_driver = {
412 .name = "amd756_smbus",
413 .id_table = amd756_ids,
414 .probe = amd756_probe,
415 .remove = __devexit_p(amd756_remove),
416 .dynids.use_driver_data = 1,
419 static int __init amd756_init(void)
421 return pci_register_driver(&amd756_driver);
424 static void __exit amd756_exit(void)
426 pci_unregister_driver(&amd756_driver);
429 MODULE_AUTHOR("Merlin Hughes <merlin@merlin.org>");
430 MODULE_DESCRIPTION("AMD756/766/768/8111 and nVidia nForce SMBus driver");
431 MODULE_LICENSE("GPL");
433 EXPORT_SYMBOL(amd756_smbus);
435 module_init(amd756_init)
436 module_exit(amd756_exit)