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i2c: piix4: Add EFCH MMIO support to SMBus base address detect 

The EFCH SMBus controller's base address is determined using details in
FCH::PM::DECODEEN[smbusasfiobase] and FCH::PM::DECODEEN[smbusasfioen].These
register fields were accessed using cd6h/cd7h port I/O. cd6h/cd7h port I/O
is no longer available in later AMD processors. Change base address
detection to use MMIO instead of port I/O cd6h/cd7h.

Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Terry Bowman 2022-02-09 11:27:15 -06:00 committed by Wolfram Sang
parent 7c148722d0
commit 46967bc1ee
1 changed files with 9 additions and 4 deletions
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13
drivers/i2c/busses/i2c-piix4.c
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@ -344,10 +344,15 @@ static int piix4_setup_sb800_smba(struct pci_dev *PIIX4_dev,
if (retval)
return retval;
outb_p(smb_en, SB800_PIIX4_SMB_IDX);
smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1);
outb_p(smb_en + 1, SB800_PIIX4_SMB_IDX);
smba_en_hi = inb_p(SB800_PIIX4_SMB_IDX + 1);
if (mmio_cfg.use_mmio) {
smba_en_lo = ioread8(mmio_cfg.addr);
smba_en_hi = ioread8(mmio_cfg.addr + 1);
} else {
outb_p(smb_en, SB800_PIIX4_SMB_IDX);
smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1);
outb_p(smb_en + 1, SB800_PIIX4_SMB_IDX);
smba_en_hi = inb_p(SB800_PIIX4_SMB_IDX + 1);
}
piix4_sb800_region_release(&PIIX4_dev->dev, &mmio_cfg);