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southbridge/intel/common: Add Process Call 

Add functionality to use process call cycle. It can be used to
write/read data to/from e.g. EEPROM attached to SMBus Controller
via I2C.

Tested on:
* C246

Change-Id: Ifdac6cf70a4ce744601f5d152a83d2125ea88360
Signed-off-by: Christian Walter <christian.walter@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39875
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Christian Walter 2020-03-27 11:59:43 +01:00 committed by Patrick Georgi
parent 5cb34e2ea0
commit 04953ebf5f
2 changed files with 38 additions and 0 deletions
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1
src/include/device/smbus_host.h
View File

@ -17,6 +17,7 @@ int do_smbus_write_word(uintptr_t base, u8 device, u8 address, u16 data);
int do_smbus_block_read(uintptr_t base, u8 device, u8 cmd, size_t max_bytes, u8 *buf);
int do_smbus_block_write(uintptr_t base, u8 device, u8 cmd, size_t bytes, const u8 *buf);
int do_smbus_process_call(uintptr_t base, u8 device, u8 cmd, u16 data, u16 *buf);
/* For Intel, implemented since ICH5. */
int do_i2c_eeprom_read(uintptr_t base, u8 device, u8 offset, size_t bytes, u8 *buf);

37
src/southbridge/intel/common/smbus.c
View File

@ -33,6 +33,7 @@
#define I801_BYTE (1 << 2)
#define I801_BYTE_DATA (2 << 2)
#define I801_WORD_DATA (3 << 2)
#define I801_PROCESS_CALL (4 << 2)
#define I801_BLOCK_DATA (5 << 2)
#define I801_I2C_BLOCK_DATA (6 << 2) /* ICH5 and later */
@ -391,6 +392,42 @@ int do_smbus_block_read(uintptr_t base, u8 device, u8 cmd, size_t max_bytes, u8
return ret;
}
/*
* The caller is responsible of settings HOSTC I2C_EN bit prior to making this
* call!
*/
int do_smbus_process_call(uintptr_t base, u8 device, u8 cmd, u16 data, u16 *buf)
{
int ret;
/* Set up for process call */
ret = setup_command(base, I801_PROCESS_CALL, XMIT_WRITE(device));
if (ret < 0)
return ret;
/* cmd will only be send if I2C_EN is zero */
host_outb(base, SMBHSTCMD, cmd);
host_outb(base, SMBHSTDAT0, data & 0x00ff);
host_outb(base, SMBHSTDAT1, (data & 0xff00) >> 8);
/* Start the command */
ret = execute_command(base);
if (ret < 0)
return ret;
/* Poll for transaction completion */
ret = complete_command(base);
if (ret < 0)
return ret;
/* Read results of transaction */
*buf = host_inb(base, SMBHSTDAT0);
*buf |= (host_inb(base, SMBHSTDAT1) << 8);
return ret;
}
int do_smbus_block_write(uintptr_t base, u8 device, u8 cmd, const size_t bytes, const u8 *buf)
{
int ret;