diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-piix4.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-piix4.c | 36 |
1 files changed, 32 insertions, 4 deletions
diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c index 93f2895..78d4483d 100644 --- a/drivers/i2c/busses/i2c-piix4.c +++ b/drivers/i2c/busses/i2c-piix4.c @@ -85,8 +85,14 @@ /* SB800 constants */ #define SB800_PIIX4_SMB_IDX 0xcd6 -/* SB800 port is selected by bits 2:1 of the smb_en register (0x2c) */ +/* + * SB800 port is selected by bits 2:1 of the smb_en register (0x2c) + * or the smb_sel register (0x2e), depending on bit 0 of register 0x2f. + * Hudson-2/Bolton port is always selected by bits 2:1 of register 0x2f. + */ #define SB800_PIIX4_PORT_IDX 0x2c +#define SB800_PIIX4_PORT_IDX_ALT 0x2e +#define SB800_PIIX4_PORT_IDX_SEL 0x2f #define SB800_PIIX4_PORT_IDX_MASK 0x06 /* insmod parameters */ @@ -136,8 +142,13 @@ static const struct dmi_system_id piix4_dmi_ibm[] = { { }, }; -/* SB800 globals */ +/* + * SB800 globals + * piix4_mutex_sb800 protects piix4_port_sel_sb800 and the pair + * of I/O ports at SB800_PIIX4_SMB_IDX. + */ static DEFINE_MUTEX(piix4_mutex_sb800); +static u8 piix4_port_sel_sb800; static const char *piix4_main_port_names_sb800[PIIX4_MAX_ADAPTERS] = { " port 0", " port 2", " port 3", " port 4" }; @@ -254,7 +265,7 @@ static int piix4_setup_sb800(struct pci_dev *PIIX4_dev, const struct pci_device_id *id, u8 aux) { unsigned short piix4_smba; - u8 smba_en_lo, smba_en_hi, smb_en, smb_en_status; + u8 smba_en_lo, smba_en_hi, smb_en, smb_en_status, port_sel; u8 i2ccfg, i2ccfg_offset = 0x10; /* SB800 and later SMBus does not support forcing address */ @@ -334,6 +345,23 @@ static int piix4_setup_sb800(struct pci_dev *PIIX4_dev, "SMBus Host Controller at 0x%x, revision %d\n", piix4_smba, i2ccfg >> 4); + /* Find which register is used for port selection */ + if (PIIX4_dev->vendor == PCI_VENDOR_ID_AMD) { + piix4_port_sel_sb800 = SB800_PIIX4_PORT_IDX_ALT; + } else { + mutex_lock(&piix4_mutex_sb800); + outb_p(SB800_PIIX4_PORT_IDX_SEL, SB800_PIIX4_SMB_IDX); + port_sel = inb_p(SB800_PIIX4_SMB_IDX + 1); + piix4_port_sel_sb800 = (port_sel & 0x01) ? + SB800_PIIX4_PORT_IDX_ALT : + SB800_PIIX4_PORT_IDX; + mutex_unlock(&piix4_mutex_sb800); + } + + dev_info(&PIIX4_dev->dev, + "Using register 0x%02x for SMBus port selection\n", + (unsigned int)piix4_port_sel_sb800); + return piix4_smba; } @@ -563,7 +591,7 @@ static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr, mutex_lock(&piix4_mutex_sb800); - outb_p(SB800_PIIX4_PORT_IDX, SB800_PIIX4_SMB_IDX); + outb_p(piix4_port_sel_sb800, SB800_PIIX4_SMB_IDX); smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1); port = adapdata->port; |
