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authorShane Huang <shane.huang@amd.com>2009-03-28 21:34:46 +0100
committerJean Delvare <khali@linux-fr.org>2009-03-28 21:34:46 +0100
commit87e1960e93fe792c4f4344a6f3a970f9573c76aa (patch)
treef639de840f26b45f395ec7ef2c8e92f2935a37a4 /drivers/i2c
parent6b110d13aacc9c4ef5f01af12a5e2b7f1d23f106 (diff)
i2c-piix4: Add support to SB800 SMBus changes
Add support for the AMD SB800 Family series of products. Major changes include the changes to addressing the SMBus registers at different location from the locations in the previous compatible parts from AMD such as SB400/SB600/SB700. For SB800, the main features and register definitions of SMBus and other interfaces are still compatible with the previous products with the only change being in how to access the internal registers for these blocks. Signed-off-by: Shane Huang <shane.huang@amd.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'drivers/i2c')
-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 761f9dd5362..63d5e597804 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,
return 0;
}
+static int __devinit piix4_setup_sb800(struct pci_dev *PIIX4_dev,
+ const struct pci_device_id *id)
+{
+ unsigned short smba_idx = 0xcd6;
+ u8 smba_en_lo, smba_en_hi, i2ccfg, i2ccfg_offset = 0x10, smb_en = 0x2c;
+
+ /* SB800 SMBus does not support forcing address */
+ if (force || force_addr) {
+ dev_err(&PIIX4_dev->dev, "SB800 SMBus does not support "
+ "forcing address!\n");
+ return -EINVAL;
+ }
+
+ /* Determine the address of the SMBus areas */
+ if (!request_region(smba_idx, 2, "smba_idx")) {
+ dev_err(&PIIX4_dev->dev, "SMBus base address index region "
+ "0x%x already in use!\n", smba_idx);
+ return -EBUSY;
+ }
+ outb_p(smb_en, smba_idx);
+ smba_en_lo = inb_p(smba_idx + 1);
+ outb_p(smb_en + 1, smba_idx);
+ smba_en_hi = inb_p(smba_idx + 1);
+ release_region(smba_idx, 2);
+
+ if ((smba_en_lo & 1) == 0) {
+ dev_err(&PIIX4_dev->dev,
+ "Host SMBus controller not enabled!\n");
+ return -ENODEV;
+ }
+
+ piix4_smba = ((smba_en_hi << 8) | smba_en_lo) & 0xffe0;
+ if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
+ return -EBUSY;
+
+ if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
+ dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
+ piix4_smba);
+ return -EBUSY;
+ }
+
+ /* Request the SMBus I2C bus config region */
+ if (!request_region(piix4_smba + i2ccfg_offset, 1, "i2ccfg")) {
+ dev_err(&PIIX4_dev->dev, "SMBus I2C bus config region "
+ "0x%x already in use!\n", piix4_smba + i2ccfg_offset);
+ release_region(piix4_smba, SMBIOSIZE);
+ piix4_smba = 0;
+ return -EBUSY;
+ }
+ i2ccfg = inb_p(piix4_smba + i2ccfg_offset);
+ release_region(piix4_smba + i2ccfg_offset, 1);
+
+ if (i2ccfg & 1)
+ dev_dbg(&PIIX4_dev->dev, "Using IRQ for SMBus.\n");
+ else
+ dev_dbg(&PIIX4_dev->dev, "Using SMI# for SMBus.\n");
+
+ dev_info(&PIIX4_dev->dev,
+ "SMBus Host Controller at 0x%x, revision %d\n",
+ piix4_smba, i2ccfg >> 4);
+
+ return 0;
+}
+
static int piix4_transaction(void)
{
int temp;
@@ -433,7 +497,14 @@ static int __devinit piix4_probe(struct pci_dev *dev,
{
int retval;
- retval = piix4_setup(dev, id);
+ if ((dev->vendor == PCI_VENDOR_ID_ATI) &&
+ (dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS) &&
+ (dev->revision >= 0x40))
+ /* base address location etc changed in SB800 */
+ retval = piix4_setup_sb800(dev, id);
+ else
+ retval = piix4_setup(dev, id);
+
if (retval)
return retval;