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i2c: piix4: Move SMBus port selection into function

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commit fbafbd51bf 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>
This commit is contained in:
Terry Bowman 2022-02-09 11:27:13 -06:00 committed by Greg Kroah-Hartman
parent 3b182ec216
commit bf5d8b502f
1 changed files with 17 additions and 10 deletions
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27
drivers/i2c/busses/i2c-piix4.c
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@ -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_adapter *adap, u16 addr,
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_adapter *adap, u16 addr,
}
}
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);