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sb/intel/common: Add smbus_{read/write}_word() variants

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Change-Id: I1a9432c901e7baa545d34c1d0f82212bf59f8e23
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38141
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Kyösti Mälkki 2020-01-02 17:02:54 +02:00
parent 265cd9a2ee
commit 7ca19b289e
2 changed files with 43 additions and 10 deletions
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48
src/southbridge/intel/common/smbus.c
View file

@ -175,22 +175,23 @@ static int complete_command(unsigned int smbus_base)
return cb_err_from_stat(status);
}
int do_smbus_read_byte(unsigned int smbus_base, u8 device,
static int smbus_read_cmd(unsigned int smbus_base, u8 ctrl, u8 device,
unsigned int address)
{
int ret;
u8 byte;
u16 word;
/* Set up for a byte data read. */
ret = setup_command(smbus_base, I801_BYTE_DATA, XMIT_READ(device));
ret = setup_command(smbus_base, ctrl, XMIT_READ(device));
if (ret < 0)
return ret;
/* Set the command/address... */
outb(address, smbus_base + SMBHSTCMD);
/* Clear the data byte... */
/* Clear the data bytes... */
outb(0, smbus_base + SMBHSTDAT0);
outb(0, smbus_base + SMBHSTDAT1);
/* Start the command */
ret = execute_command(smbus_base);
@ -203,25 +204,30 @@ int do_smbus_read_byte(unsigned int smbus_base, u8 device,
return ret;
/* Read results of transaction */
byte = inb(smbus_base + SMBHSTDAT0);
return byte;
word = inb(smbus_base + SMBHSTDAT0);
if (ctrl == I801_WORD_DATA)
word |= inb(smbus_base + SMBHSTDAT1) << 8;
return word;
}
int do_smbus_write_byte(unsigned int smbus_base, u8 device,
static int smbus_write_cmd(unsigned int smbus_base, u8 ctrl, u8 device,
unsigned int address, unsigned int data)
{
int ret;
/* Set up for a byte data write. */
ret = setup_command(smbus_base, I801_BYTE_DATA, XMIT_WRITE(device));
ret = setup_command(smbus_base, ctrl, XMIT_WRITE(device));
if (ret < 0)
return ret;
/* Set the command/address... */
outb(address, smbus_base + SMBHSTCMD);
/* Set the data byte... */
outb(data, smbus_base + SMBHSTDAT0);
/* Set the data bytes... */
outb(data & 0xff, smbus_base + SMBHSTDAT0);
if (ctrl == I801_WORD_DATA)
outb(data >> 8, smbus_base + SMBHSTDAT1);
/* Start the command */
ret = execute_command(smbus_base);
@ -313,6 +319,28 @@ static int block_cmd_loop(unsigned int smbus_base,
return bytes;
}
int do_smbus_read_byte(unsigned int smbus_base, u8 device, unsigned int address)
{
return smbus_read_cmd(smbus_base, I801_BYTE_DATA, device, address);
}
int do_smbus_read_word(unsigned int smbus_base, u8 device, unsigned int address)
{
return smbus_read_cmd(smbus_base, I801_WORD_DATA, device, address);
}
int do_smbus_write_byte(unsigned int smbus_base, u8 device, unsigned int address,
unsigned int data)
{
return smbus_write_cmd(smbus_base, I801_BYTE_DATA, device, address, data);
}
int do_smbus_write_word(unsigned int smbus_base, u8 device, unsigned int address,
unsigned int data)
{
return smbus_write_cmd(smbus_base, I801_WORD_DATA, device, address, data);
}
int do_smbus_block_read(unsigned int smbus_base, u8 device, u8 cmd,
unsigned int max_bytes, u8 *buf)
{

5
src/southbridge/intel/common/smbus.h
View file

@ -36,6 +36,11 @@ int do_smbus_read_byte(unsigned int smbus_base, u8 device,
unsigned int address);
int do_smbus_write_byte(unsigned int smbus_base, u8 device,
unsigned int address, unsigned int data);
int do_smbus_read_word(unsigned int smbus_base, u8 device,
unsigned int address);
int do_smbus_write_word(unsigned int smbus_base, u8 device,
unsigned int address, unsigned int data);
int do_smbus_block_read(unsigned int smbus_base, u8 device,
u8 cmd, unsigned int max_bytes, u8 *buf);
int do_smbus_block_write(unsigned int smbus_base, u8 device,