From: Terry Bowman terry.bowman@amd.com
commit fbafbd51bff52cb3a920fd98d4dae2a78dd433d0 upstream.
Move port selection code into a separate function. Refactor is in preparation for following MMIO changes.
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 Cc: Mario Limonciello Mario.Limonciello@amd.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/i2c/busses/i2c-piix4.c | 27 +++++++++++++++++---------- 1 file changed, 17 insertions(+), 10 deletions(-)
--- a/drivers/i2c/busses/i2c-piix4.c +++ b/drivers/i2c/busses/i2c-piix4.c @@ -698,6 +698,20 @@ static void piix4_imc_wakeup(void) release_region(KERNCZ_IMC_IDX, 2); }
+static int piix4_sb800_port_sel(u8 port) +{ + u8 smba_en_lo, val; + + outb_p(piix4_port_sel_sb800, SB800_PIIX4_SMB_IDX); + smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1); + + val = (smba_en_lo & ~piix4_port_mask_sb800) | port; + if (smba_en_lo != val) + outb_p(val, SB800_PIIX4_SMB_IDX + 1); + + return (smba_en_lo & piix4_port_mask_sb800); +} + /* * Handles access to multiple SMBus ports on the SB800. * The port is selected by bits 2:1 of the smb_en register (0x2c). @@ -714,8 +728,7 @@ static s32 piix4_access_sb800(struct i2c unsigned short piix4_smba = adapdata->smba; int retries = MAX_TIMEOUT; int smbslvcnt; - u8 smba_en_lo; - u8 port; + u8 prev_port; int retval;
retval = piix4_sb800_region_request(&adap->dev); @@ -775,18 +788,12 @@ static s32 piix4_access_sb800(struct i2c } }
- outb_p(piix4_port_sel_sb800, SB800_PIIX4_SMB_IDX); - smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1); - - port = adapdata->port; - if ((smba_en_lo & piix4_port_mask_sb800) != port) - outb_p((smba_en_lo & ~piix4_port_mask_sb800) | port, - SB800_PIIX4_SMB_IDX + 1); + prev_port = piix4_sb800_port_sel(adapdata->port);
retval = piix4_access(adap, addr, flags, read_write, command, size, data);
- outb_p(smba_en_lo, SB800_PIIX4_SMB_IDX + 1); + piix4_sb800_port_sel(prev_port);
/* Release the semaphore */ outb_p(smbslvcnt | 0x20, SMBSLVCNT);