From 836ae29ee325b1e3d28ff59468cc50913b1e24ce Mon Sep 17 00:00:00 2001 From: stepan Date: Wed, 8 Dec 2010 05:42:47 +0000 Subject: first round name simplification. drop the _ prefix. the prefix was introduced in the early v2 tree many years ago because our old build system "newconfig" could not handle two files with the same name in different paths like /path/to/usb.c and /another/path/to/usb.c correctly. Only one of the files would end up being compiled into the final image. Since Kconfig (actually since shortly before we switched to Kconfig) we don't suffer from that problem anymore. So we could drop the sb700_ prefix from all those filenames (or, the _ prefix in general) - makes it easier to fork off a new chipset - makes it easier to diff against other chipsets - storing redundant information in filenames seems wrong Signed-off-by: Acked-by: Patrick Georgi Acked-by: Peter Stuge git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6149 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1 --- src/southbridge/intel/i3100/smbus.h | 112 ++++++++++++++++++++++++++++++++++++ 1 file changed, 112 insertions(+) create mode 100644 src/southbridge/intel/i3100/smbus.h (limited to 'src/southbridge/intel/i3100/smbus.h') diff --git a/src/southbridge/intel/i3100/smbus.h b/src/southbridge/intel/i3100/smbus.h new file mode 100644 index 0000000000..7023a5b751 --- /dev/null +++ b/src/southbridge/intel/i3100/smbus.h @@ -0,0 +1,112 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2008 Arastra, 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/* This code is based on src/southbridge/intel/esb6300/esb6300_smbus.h */ + +#include + +#define SMBHSTSTAT 0x0 +#define SMBHSTCTL 0x2 +#define SMBHSTCMD 0x3 +#define SMBXMITADD 0x4 +#define SMBHSTDAT0 0x5 +#define SMBHSTDAT1 0x6 +#define SMBBLKDAT 0x7 +#define SMBTRNSADD 0x9 +#define SMBSLVDATA 0xa +#define SMLINK_PIN_CTL 0xe +#define SMBUS_PIN_CTL 0xf +#define SMBSLVCMD 0x11 + +#define SMBUS_TIMEOUT (100*1000*10) + +static void smbus_delay(void) +{ + outb(0x80, 0x80); +} + +static int smbus_wait_until_ready(u32 smbus_io_base) +{ + u32 loops = SMBUS_TIMEOUT; + u8 byte; + do { + smbus_delay(); + if (--loops == 0) + break; + byte = inb(smbus_io_base + SMBHSTSTAT); + } while (byte & 1); + return loops ? 0 : -1; +} + +static int smbus_wait_until_done(u32 smbus_io_base) +{ + u32 loops = SMBUS_TIMEOUT; + u8 byte; + do { + smbus_delay(); + if (--loops == 0) + break; + byte = inb(smbus_io_base + SMBHSTSTAT); + } while ((byte & 1) || (byte & ~((1 << 6)|(1 << 0))) == 0); + return loops ? 0 : -1; +} + +static int do_smbus_read_byte(u32 smbus_io_base, u16 device, u8 address) +{ + u8 global_status_register; + u8 byte; + + if (smbus_wait_until_ready(smbus_io_base) < 0) { + return SMBUS_WAIT_UNTIL_READY_TIMEOUT; + } + /* setup transaction */ + /* disable interrupts */ + outb(inb(smbus_io_base + SMBHSTCTL) & (~1), smbus_io_base + SMBHSTCTL); + /* set the device I'm talking too */ + outb(((device & 0x7f) << 1) | 1, smbus_io_base + SMBXMITADD); + /* set the command/address... */ + outb(address & 0xFF, smbus_io_base + SMBHSTCMD); + /* set up for a byte data read */ + outb((inb(smbus_io_base + SMBHSTCTL) & 0xE3) | (0x2 << 2), smbus_io_base + SMBHSTCTL); + /* clear any lingering errors, so the transaction will run */ + outb(inb(smbus_io_base + SMBHSTSTAT), smbus_io_base + SMBHSTSTAT); + + /* clear the data byte...*/ + outb(0, smbus_io_base + SMBHSTDAT0); + + /* start the command */ + outb((inb(smbus_io_base + SMBHSTCTL) | 0x40), 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 &= ~(3 << 5); + + /* read results of transaction */ + byte = inb(smbus_io_base + SMBHSTDAT0); + if (global_status_register != (1 << 1)) { + return SMBUS_ERROR; + } + return byte; +} -- cgit v1.2.3