diff options
Diffstat (limited to 'src/southbridge/amd/cs5536/smbus.c')
| -rw-r--r-- | src/southbridge/amd/cs5536/smbus.c | 187 |
1 files changed, 0 insertions, 187 deletions
diff --git a/src/southbridge/amd/cs5536/smbus.c b/src/southbridge/amd/cs5536/smbus.c deleted file mode 100644 index ddbcdf2683..0000000000 --- a/src/southbridge/amd/cs5536/smbus.c +++ /dev/null @@ -1,187 +0,0 @@ -/* - * This file is part of the coreboot project. - * - * Copyright (C) 2007 Advanced Micro Devices, Inc. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - */ - -#include <console/console.h> -#include <arch/io.h> -#include "cs5536.h" -#include "smbus.h" - -#define SMBUS_TIMEOUT (1000) - -static void smbus_delay(void) -{ - /* inb(0x80); */ -} - -static int smbus_wait(unsigned smbus_io_base) -{ - unsigned long loops = SMBUS_TIMEOUT; - unsigned char val; - - do { - smbus_delay(); - val = inb(smbus_io_base + SMB_STS); - if ((val & SMB_STS_SDAST) != 0) - break; - if (val & (SMB_STS_BER | SMB_STS_NEGACK)) { - /*printk(BIOS_DEBUG, "SMBUS WAIT ERROR %x\n", val); */ - return SMBUS_ERROR; - } - } while (--loops); - return loops ? 0 : SMBUS_WAIT_UNTIL_READY_TIMEOUT; -} - -/* generate a smbus start condition */ -int smbus_start_condition(unsigned smbus_io_base) -{ - unsigned char val; - - /* issue a START condition */ - val = inb(smbus_io_base + SMB_CTRL1); - outb(val | SMB_CTRL1_START, smbus_io_base + SMB_CTRL1); - - /* check for bus conflict */ - val = inb(smbus_io_base + SMB_STS); - if ((val & SMB_STS_BER) != 0) - return SMBUS_ERROR; - - return smbus_wait(smbus_io_base); -} - -int smbus_check_stop_condition(unsigned smbus_io_base) -{ - unsigned char val; - unsigned long loops; - loops = SMBUS_TIMEOUT; - /* check for SDA status */ - do { - smbus_delay(); - val = inb(smbus_io_base + SMB_CTRL1); - if ((val & SMB_CTRL1_STOP) == 0) { - break; - } - outb((0x7F << 1) | SMB_CTRL2_ENABLE, smbus_io_base + SMB_CTRL2); - } while (--loops); - return loops ? 0 : SMBUS_WAIT_UNTIL_READY_TIMEOUT; -} - -int smbus_stop_condition(unsigned smbus_io_base) -{ - outb(SMB_CTRL1_STOP, smbus_io_base + SMB_CTRL1); - return smbus_wait(smbus_io_base); -} - -static int smbus_ack(unsigned smbus_io_base, int state) -{ - unsigned char val = inb(smbus_io_base + SMB_CTRL1); - -/* if (state) */ - outb(val | SMB_CTRL1_ACK, smbus_io_base + SMB_CTRL1); -/* else - outb(val & ~SMB_CTRL1_ACK, smbus_io_base + SMB_CTRL1); -*/ - return 0; -} - -int smbus_send_slave_address(unsigned smbus_io_base, - unsigned char device) -{ - unsigned char val; - - /* send the slave address */ - outb(device, smbus_io_base + SMB_SDA); - - /* check for bus conflict and NACK */ - val = inb(smbus_io_base + SMB_STS); - if (((val & SMB_STS_BER) != 0) || ((val & SMB_STS_NEGACK) != 0)) { - /* printk(BIOS_DEBUG, "SEND SLAVE ERROR (%x)\n", val); */ - return SMBUS_ERROR; - } - return smbus_wait(smbus_io_base); -} - -int smbus_send_command(unsigned smbus_io_base, unsigned char command) -{ - unsigned char val; - - /* send the command */ - outb(command, smbus_io_base + SMB_SDA); - - /* check for bus conflict and NACK */ - val = inb(smbus_io_base + SMB_STS); - if (((val & SMB_STS_BER) != 0) || ((val & SMB_STS_NEGACK) != 0)) - return SMBUS_ERROR; - - return smbus_wait(smbus_io_base); -} - -static unsigned char smbus_get_result(unsigned smbus_io_base) -{ - return inb(smbus_io_base + SMB_SDA); -} - -unsigned char do_smbus_read_byte(unsigned smbus_io_base, - unsigned char device, - unsigned char address) -{ - unsigned char error = 0; - - if ((smbus_check_stop_condition(smbus_io_base))) { - error = 1; - goto err; - } - - if ((smbus_start_condition(smbus_io_base))) { - error = 2; - goto err; - } - - if ((smbus_send_slave_address(smbus_io_base, device << 1))) { - error = 3; - goto err; - } - - smbus_ack(smbus_io_base, 1); - - if ((smbus_send_command(smbus_io_base, address))) { - error = 4; - goto err; - } - - if ((smbus_start_condition(smbus_io_base))) { - error = 5; - goto err; - } - - if ((smbus_send_slave_address(smbus_io_base, (device << 1) | 0x01))) { - error = 6; - goto err; - } - - if ((smbus_stop_condition(smbus_io_base))) { - error = 7; - goto err; - } - - return smbus_get_result(smbus_io_base); - -err: - printk(BIOS_DEBUG, "SMBUS READ ERROR: %02x device: %02x\n", error, device); - /* stop, clean up the error, and leave */ - smbus_stop_condition(smbus_io_base); - outb(inb(smbus_io_base + SMB_STS), smbus_io_base + SMB_STS); - outb(0x0, smbus_io_base + SMB_STS); - return 0xFF; -} |