diff options
Diffstat (limited to 'src/southbridge/intel/fsp_bd82x6x/early_smbus.c')
| -rw-r--r-- | src/southbridge/intel/fsp_bd82x6x/early_smbus.c | 211 |
1 files changed, 0 insertions, 211 deletions
diff --git a/src/southbridge/intel/fsp_bd82x6x/early_smbus.c b/src/southbridge/intel/fsp_bd82x6x/early_smbus.c deleted file mode 100644 index 10b4287d0f..0000000000 --- a/src/southbridge/intel/fsp_bd82x6x/early_smbus.c +++ /dev/null @@ -1,211 +0,0 @@ -/* - * This file is part of the coreboot project. - * - * Copyright (C) 2008-2009 coresystems GmbH - * Copyright (C) 2012 Sage Electronic Engineering, LLC - * - * 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 <arch/io.h> -#include <console/console.h> -#include <device/pci_ids.h> -#include <device/pci_def.h> -#include <device/smbus_def.h> -#include "pch.h" - -#define FULL_RW 0x48 -#define QUICK_RW 0x44 - -static void smbus_delay(void) -{ - inb(0xeb); -} - -/** \brief block until the SMBus is no longer busy, or it times out - * - * \param smbus_base IO base address of the SMBus - */ -static int smbus_wait_until_ready(u16 smbus_base) -{ - unsigned loops = SMBUS_TIMEOUT; - unsigned char byte; - do { - smbus_delay(); - if (--loops == 0) - break; - byte = inb(smbus_base + SMBHSTSTAT); - } while (byte & HSTSTS_HOST_BUSY); - return loops ? 0 : -1; -} - -/** \brief block until the SMBus is no longer busy or in use, or it times out - * - * \param smbus_base IO base address of the SMBus - */ -static int smbus_wait_until_done(u16 smbus_base) -{ - unsigned loops = SMBUS_TIMEOUT; - unsigned char byte; - do { - smbus_delay(); - if (--loops == 0) - break; - byte = inb(smbus_base + SMBHSTSTAT); - } while ((byte & HSTSTS_HOST_BUSY) || - (byte & ~(HSTSTS_INUSE_STS | HSTSTS_HOST_BUSY)) == 0); - return loops ? 0 : -1; -} -/** \brief Sets the SMBus BAR, and configures it to run - * - */ -void enable_smbus(void) -{ - pci_devfn_t dev; - - /* Set the SMBus device statically. */ - dev = PCI_DEV(0x0, 0x1f, 0x3); - - /* Check to make sure we've got the right device. */ - if (pci_read_config16(dev, 0x0) != 0x8086) { - die("SMBus controller not found!"); - } - - /* Set SMBus I/O base. */ - pci_write_config32(dev, SMB_BASE, SMBUS_IO_BASE | PCI_BASE_ADDRESS_SPACE_IO); - - /* Set SMBus enable. */ - pci_write_config8(dev, HOSTC, HST_EN); - - /* Set SMBus I/O space enable. */ - pci_write_config16(dev, PCI_COMMAND, PCI_COMMAND_IO); - - /* Disable interrupt generation. */ - outb(0, SMBUS_IO_BASE + SMBHSTCTL); - - /* Clear any lingering errors, so transactions can run. */ - outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), SMBUS_IO_BASE + SMBHSTSTAT); - printk(BIOS_DEBUG, "SMBus controller enabled.\n"); -} - -/** \brief generic smbus helper function to read & write to the smbus - * - * \details Configures the SMBus for the transaction, sets up the address - * and data bytes, starts the command, waits for the command to - * finish, and returns data if the command is a read. - * - * \param device The 8-bit device address, with the read / write bit set-up. - * - * \param addr_dat For full reads/writes, this contains the address within - * the device of the byte being read/written. For quick writes, - * this contains the data to write. - * - * \param data For full writes, this contains the Data to write to the - * device. For all other transactions, this is ignored. - * - * \param command Contains the command for a full read/write (0x48) or the - * command for a quick read/write (0x44) - * - * \return Data read from the device, or -1 if there was an error - */ -static s16 smbus_rw_byte(u8 device, u8 addr_dat, u8 data, u8 command) -{ - u8 global_status_register; - - if (smbus_wait_until_ready(SMBUS_IO_BASE) < 0) - return SMBUS_WAIT_UNTIL_READY_TIMEOUT; - - /*** Set up transaction ***/ - - /* Disable interrupts */ - outb(inb(SMBUS_IO_BASE + SMBHSTCTL) & (~1), SMBUS_IO_BASE + SMBHSTCTL); - - /* Set the device being talked to using supplied device address*/ - outb(device, SMBUS_IO_BASE + SMBXMITADD); - - /* Set the address and data byte */ - outb(addr_dat, SMBUS_IO_BASE + SMBHSTCMD); - outb(data, SMBUS_IO_BASE + SMBHSTDAT0); - - /* Clear any lingering errors, so the transaction will run */ - outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), SMBUS_IO_BASE + SMBHSTSTAT); - - /* Start the command */ - outb(command, SMBUS_IO_BASE + SMBHSTCTL); - - /* Poll for transaction completion */ - if (smbus_wait_until_done(SMBUS_IO_BASE) < 0) - return SMBUS_WAIT_UNTIL_DONE_TIMEOUT; - - global_status_register = inb(SMBUS_IO_BASE + SMBHSTSTAT); - - /* Ignore the "In Use" status... */ - global_status_register &= ~(HSTSTS_SMBALERT_STS | HSTSTS_INUSE_STS); - - /* Read results - INTR gets set when a command is completed successfully */ - data = inb(SMBUS_IO_BASE + SMBHSTDAT0); - if (global_status_register != HSTSTS_INTR) - return SMBUS_ERROR; - - return data; -} - -/** \brief Sends an address and writes one byte of data - * - * \param device The 7-bit address of the device being written to - * - * \param address The address within the device to write the data to - * - * \param data The data value to write to the device - * - * \return -1 if there was an error - */ -s16 smbus_write_single_byte(u8 device, u8 address, u8 data) -{ - return (smbus_rw_byte(device << 1, address, data, FULL_RW)); -} - -/** \brief Sends an address and reads one byte of data - * - * \param device The 7-bit address of the device being written to - * - * \param address The address within the device to write the data to - * - * \return Data read from the device, or -1 if there was an error - */ -int smbus_read_byte(unsigned device, unsigned address) -{ - return (smbus_rw_byte((device << 1) | 1, address, 0, FULL_RW)); -} - -/** \brief Sends one byte of data with no address byte - * - * \param device The 7-bit address of the device being written to - * - * \param data The data value to write to the device - * - * \return -1 if there was an error - */ -s16 smbus_quick_write(u8 device, u8 data) -{ - return (smbus_rw_byte(device << 1, data, 0, QUICK_RW)); -} - -/** \brief Reads one byte of data without sending an address byte - * - * \param device The 7-bit address of the device being written to - * - * \return Data read from the device, or -1 if there was an error - */ -s16 smbus_quick_read(u8 device) -{ - return (smbus_rw_byte((device << 1) | 1, 0, 0, QUICK_RW)); -} |