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    Subject[PATCH 5.17 010/158] i2c: piix4: Add EFCH MMIO support for SMBus port select
    Date
    From: Terry Bowman <terry.bowman@amd.com>

    commit 381a3083c6747ae5cdbef9b176d57d1b966db49f upstream.

    AMD processors include registers capable of selecting between 2 SMBus
    ports. Port selection is made during each user access by writing to
    FCH::PM::DECODEEN[smbus0sel]. Change the driver to use MMIO during
    SMBus port selection because cd6h/cd7h port I/O is not available on
    later AMD processors.

    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 | 15 ++++++++++++---
    1 file changed, 12 insertions(+), 3 deletions(-)

    --- a/drivers/i2c/busses/i2c-piix4.c
    +++ b/drivers/i2c/busses/i2c-piix4.c
    @@ -753,10 +753,19 @@ static void piix4_imc_wakeup(void)
    release_region(KERNCZ_IMC_IDX, 2);
    }

    -static int piix4_sb800_port_sel(u8 port)
    +static int piix4_sb800_port_sel(u8 port, struct sb800_mmio_cfg *mmio_cfg)
    {
    u8 smba_en_lo, val;

    + if (mmio_cfg->use_mmio) {
    + smba_en_lo = ioread8(mmio_cfg->addr + piix4_port_sel_sb800);
    + val = (smba_en_lo & ~piix4_port_mask_sb800) | port;
    + if (smba_en_lo != val)
    + iowrite8(val, mmio_cfg->addr + piix4_port_sel_sb800);
    +
    + return (smba_en_lo & piix4_port_mask_sb800);
    + }
    +
    outb_p(piix4_port_sel_sb800, SB800_PIIX4_SMB_IDX);
    smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1);

    @@ -843,12 +852,12 @@ static s32 piix4_access_sb800(struct i2c
    }
    }

    - prev_port = piix4_sb800_port_sel(adapdata->port);
    + prev_port = piix4_sb800_port_sel(adapdata->port, &adapdata->mmio_cfg);

    retval = piix4_access(adap, addr, flags, read_write,
    command, size, data);

    - piix4_sb800_port_sel(prev_port);
    + piix4_sb800_port_sel(prev_port, &adapdata->mmio_cfg);

    /* Release the semaphore */
    outb_p(smbslvcnt | 0x20, SMBSLVCNT);

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