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-rw-r--r--drivers/i2c/busses/i2c-piix4.c73
1 files changed, 72 insertions, 1 deletions
diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c
index 761f9dd53620..63d5e5978046 100644
--- a/drivers/i2c/busses/i2c-piix4.c
+++ b/drivers/i2c/busses/i2c-piix4.c
@@ -226,6 +226,70 @@ static int __devinit piix4_setup(struct pci_dev *PIIX4_dev,
226 return 0; 226 return 0;
227} 227}
228 228
229static int __devinit piix4_setup_sb800(struct pci_dev *PIIX4_dev,
230 const struct pci_device_id *id)
231{
232 unsigned short smba_idx = 0xcd6;
233 u8 smba_en_lo, smba_en_hi, i2ccfg, i2ccfg_offset = 0x10, smb_en = 0x2c;
234
235 /* SB800 SMBus does not support forcing address */
236 if (force || force_addr) {
237 dev_err(&PIIX4_dev->dev, "SB800 SMBus does not support "
238 "forcing address!\n");
239 return -EINVAL;
240 }
241
242 /* Determine the address of the SMBus areas */
243 if (!request_region(smba_idx, 2, "smba_idx")) {
244 dev_err(&PIIX4_dev->dev, "SMBus base address index region "
245 "0x%x already in use!\n", smba_idx);
246 return -EBUSY;
247 }
248 outb_p(smb_en, smba_idx);
249 smba_en_lo = inb_p(smba_idx + 1);
250 outb_p(smb_en + 1, smba_idx);
251 smba_en_hi = inb_p(smba_idx + 1);
252 release_region(smba_idx, 2);
253
254 if ((smba_en_lo & 1) == 0) {
255 dev_err(&PIIX4_dev->dev,
256 "Host SMBus controller not enabled!\n");
257 return -ENODEV;
258 }
259
260 piix4_smba = ((smba_en_hi << 8) | smba_en_lo) & 0xffe0;
261 if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
262 return -EBUSY;
263
264 if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
265 dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
266 piix4_smba);
267 return -EBUSY;
268 }
269
270 /* Request the SMBus I2C bus config region */
271 if (!request_region(piix4_smba + i2ccfg_offset, 1, "i2ccfg")) {
272 dev_err(&PIIX4_dev->dev, "SMBus I2C bus config region "
273 "0x%x already in use!\n", piix4_smba + i2ccfg_offset);
274 release_region(piix4_smba, SMBIOSIZE);
275 piix4_smba = 0;
276 return -EBUSY;
277 }
278 i2ccfg = inb_p(piix4_smba + i2ccfg_offset);
279 release_region(piix4_smba + i2ccfg_offset, 1);
280
281 if (i2ccfg & 1)
282 dev_dbg(&PIIX4_dev->dev, "Using IRQ for SMBus.\n");
283 else
284 dev_dbg(&PIIX4_dev->dev, "Using SMI# for SMBus.\n");
285
286 dev_info(&PIIX4_dev->dev,
287 "SMBus Host Controller at 0x%x, revision %d\n",
288 piix4_smba, i2ccfg >> 4);
289
290 return 0;
291}
292
229static int piix4_transaction(void) 293static int piix4_transaction(void)
230{ 294{
231 int temp; 295 int temp;
@@ -433,7 +497,14 @@ static int __devinit piix4_probe(struct pci_dev *dev,
433{ 497{
434 int retval; 498 int retval;
435 499
436 retval = piix4_setup(dev, id); 500 if ((dev->vendor == PCI_VENDOR_ID_ATI) &&
501 (dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS) &&
502 (dev->revision >= 0x40))
503 /* base address location etc changed in SB800 */
504 retval = piix4_setup_sb800(dev, id);
505 else
506 retval = piix4_setup(dev, id);
507
437 if (retval) 508 if (retval)
438 return retval; 509 return retval;
439 510