diff options
Diffstat (limited to 'src/soc/amd/stoneyridge/smbus.c')
| -rw-r--r-- | src/soc/amd/stoneyridge/smbus.c | 196 |
1 files changed, 0 insertions, 196 deletions
diff --git a/src/soc/amd/stoneyridge/smbus.c b/src/soc/amd/stoneyridge/smbus.c deleted file mode 100644 index 5474c5cd45..0000000000 --- a/src/soc/amd/stoneyridge/smbus.c +++ /dev/null @@ -1,196 +0,0 @@ -/* - * This file is part of the coreboot project. - * - * Copyright (C) 2010 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 as published by - * the Free Software Foundation; version 2 of the License. - * - * 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 <stdint.h> -#include <console/console.h> -#include <device/smbus_host.h> -#include <amdblocks/acpimmio.h> -#include <soc/southbridge.h> - -/* - * Between 1-10 seconds, We should never timeout normally - * Longer than this is just painful when a timeout condition occurs. - */ -#define SMBUS_TIMEOUT (100 * 1000 * 10) - -static u8 controller_read8(uintptr_t base, u8 reg) -{ - switch (base) { - case ACPIMMIO_SMBUS_BASE: - return smbus_read8(reg); - case ACPIMMIO_ASF_BASE: - return asf_read8(reg); - default: - printk(BIOS_ERR, "Error attempting to read SMBus at address 0x%lx\n", - base); - } - return 0xff; -} - -static void controller_write8(uintptr_t base, u8 reg, u8 val) -{ - switch (base) { - case ACPIMMIO_SMBUS_BASE: - smbus_write8(reg, val); - break; - case ACPIMMIO_ASF_BASE: - asf_write8(reg, val); - break; - default: - printk(BIOS_ERR, "Error attempting to write SMBus at address 0x%lx\n", - base); - } -} - -static int smbus_wait_until_ready(uintptr_t mmio) -{ - u32 loops; - loops = SMBUS_TIMEOUT; - do { - u8 val; - val = controller_read8(mmio, SMBHSTSTAT); - val &= SMBHST_STAT_VAL_BITS; - if (val == 0) { /* ready now */ - return 0; - } - controller_write8(mmio, SMBHSTSTAT, val); - } while (--loops); - return -2; /* time out */ -} - -static int smbus_wait_until_done(uintptr_t mmio) -{ - u32 loops; - loops = SMBUS_TIMEOUT; - do { - u8 val; - - val = controller_read8(mmio, SMBHSTSTAT); - val &= SMBHST_STAT_VAL_BITS; /* mask off reserved bits */ - if (val & SMBHST_STAT_ERROR_BITS) - return -5; /* error */ - if (val == SMBHST_STAT_NOERROR) { - controller_write8(mmio, SMBHSTSTAT, val); /* clr sts */ - return 0; - } - } while (--loops); - return -3; /* timeout */ -} - -int do_smbus_recv_byte(uintptr_t mmio, u8 device) -{ - u8 byte; - - if (smbus_wait_until_ready(mmio) < 0) - return -2; /* not ready */ - - /* set the device I'm talking to */ - controller_write8(mmio, SMBHSTADDR, ((device & 0x7f) << 1) | 1); - - byte = controller_read8(mmio, SMBHSTCTRL); - byte &= ~SMBHST_CTRL_MODE_BITS; /* Clear [4:2] */ - byte |= SMBHST_CTRL_STRT | SMBHST_CTRL_BTE_RW; /* set mode, start */ - controller_write8(mmio, SMBHSTCTRL, byte); - - /* poll for transaction completion */ - if (smbus_wait_until_done(mmio) < 0) - return -3; /* timeout or error */ - - /* read results of transaction */ - byte = controller_read8(mmio, SMBHSTDAT0); - - return byte; -} - -int do_smbus_send_byte(uintptr_t mmio, u8 device, u8 val) -{ - u8 byte; - - if (smbus_wait_until_ready(mmio) < 0) - return -2; /* not ready */ - - /* set the command... */ - controller_write8(mmio, SMBHSTDAT0, val); - - /* set the device I'm talking to */ - controller_write8(mmio, SMBHSTADDR, ((device & 0x7f) << 1) | 0); - - byte = controller_read8(mmio, SMBHSTCTRL); - byte &= ~SMBHST_CTRL_MODE_BITS; /* Clear [4:2] */ - byte |= SMBHST_CTRL_STRT | SMBHST_CTRL_BTE_RW; /* set mode, start */ - controller_write8(mmio, SMBHSTCTRL, byte); - - /* poll for transaction completion */ - if (smbus_wait_until_done(mmio) < 0) - return -3; /* timeout or error */ - - return 0; -} - -int do_smbus_read_byte(uintptr_t mmio, u8 device, u8 address) -{ - u8 byte; - - if (smbus_wait_until_ready(mmio) < 0) - return -2; /* not ready */ - - /* set the command/address... */ - controller_write8(mmio, SMBHSTCMD, address & 0xff); - - /* set the device I'm talking to */ - controller_write8(mmio, SMBHSTADDR, ((device & 0x7f) << 1) | 1); - - byte = controller_read8(mmio, SMBHSTCTRL); - byte &= ~SMBHST_CTRL_MODE_BITS; /* Clear [4:2] */ - byte |= SMBHST_CTRL_STRT | SMBHST_CTRL_BDT_RW; /* set mode, start */ - controller_write8(mmio, SMBHSTCTRL, byte); - - /* poll for transaction completion */ - if (smbus_wait_until_done(mmio) < 0) - return -3; /* timeout or error */ - - /* read results of transaction */ - byte = controller_read8(mmio, SMBHSTDAT0); - - return byte; -} - -int do_smbus_write_byte(uintptr_t mmio, u8 device, u8 address, u8 val) -{ - u8 byte; - - if (smbus_wait_until_ready(mmio) < 0) - return -2; /* not ready */ - - /* set the command/address... */ - controller_write8(mmio, SMBHSTCMD, address & 0xff); - - /* set the device I'm talking to */ - controller_write8(mmio, SMBHSTADDR, ((device & 0x7f) << 1) | 0); - - /* output value */ - controller_write8(mmio, SMBHSTDAT0, val); - - byte = controller_read8(mmio, SMBHSTCTRL); - byte &= ~SMBHST_CTRL_MODE_BITS; /* Clear [4:2] */ - byte |= SMBHST_CTRL_STRT | SMBHST_CTRL_BDT_RW; /* set mode, start */ - controller_write8(mmio, SMBHSTCTRL, byte); - - /* poll for transaction completion */ - if (smbus_wait_until_done(mmio) < 0) - return -3; /* timeout or error */ - - return 0; -} |