diff options
| author | Kyösti Mälkki <kyosti.malkki@gmail.com> | 2020-01-02 16:36:56 +0200 |
|---|---|---|
| committer | Kyösti Mälkki <kyosti.malkki@gmail.com> | 2020-01-09 18:47:06 +0000 |
| commit | 65f5de2bc44baaa88c7ce1c7525f0a0b9f6bc6e8 (patch) | |
| tree | af958093cead467628de5549ab7e210f1d5a449f /src/southbridge/intel/common | |
| parent | b49638dbe4cb8fe2920fc9ca82a0b9e0b169bf27 (diff) | |
sb/intel/common: Add SMBUS register read-modify-write
Change-Id: Ibe967d02fd05f4a8f643a5c5b17885701946d1c7
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38151
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Diffstat (limited to 'src/southbridge/intel/common')
| -rw-r--r-- | src/southbridge/intel/common/smbus.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/src/southbridge/intel/common/smbus.c b/src/southbridge/intel/common/smbus.c index 00ff1dd4c2..30d0cd098c 100644 --- a/src/southbridge/intel/common/smbus.c +++ b/src/southbridge/intel/common/smbus.c @@ -82,6 +82,15 @@ static u8 host_inb(unsigned int base, u8 reg) return inb(base + reg); } +static void host_and_or(unsigned int base, u8 reg, u8 mask, u8 or) +{ + u8 value; + value = host_inb(base, reg); + value &= mask; + value |= or; + host_outb(base, reg, value); +} + static int host_completed(u8 status) { if (status & SMBHSTSTS_HOST_BUSY) @@ -129,7 +138,7 @@ static int setup_command(unsigned int smbus_base, u8 ctrl, u8 xmitadd) SMBUS_WAIT_UNTIL_READY_TIMEOUT); /* Clear any lingering errors, so the transaction will run. */ - host_outb(smbus_base, SMBHSTSTAT, host_inb(smbus_base, SMBHSTSTAT)); + host_and_or(smbus_base, SMBHSTSTAT, 0xff, 0); /* Set up transaction */ /* Disable interrupts */ @@ -147,7 +156,7 @@ static int execute_command(unsigned int smbus_base) u8 status; /* Start the command. */ - host_outb(smbus_base, SMBHSTCTL, host_inb(smbus_base, SMBHSTCTL) | SMBHSTCNT_START); + host_and_or(smbus_base, SMBHSTCTL, 0xff, SMBHSTCNT_START); /* Poll for it to start. */ do { @@ -298,9 +307,8 @@ static int block_cmd_loop(unsigned int smbus_base, /* Indicate that next byte is the last one. */ if (sw_drives_nak && (bytes + 1 >= max_bytes)) { - host_outb(smbus_base, SMBHSTCTL, - host_inb(smbus_base, SMBHSTCTL) | - SMBHSTCNT_LAST_BYTE); + host_and_or(smbus_base, SMBHSTCTL, + 0xff, SMBHSTCNT_LAST_BYTE); } } |