diff options
Diffstat (limited to 'src/southbridge/intel/i82801ax/i82801ax_smbus.h')
| -rw-r--r-- | src/southbridge/intel/i82801ax/i82801ax_smbus.h | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/src/southbridge/intel/i82801ax/i82801ax_smbus.h b/src/southbridge/intel/i82801ax/i82801ax_smbus.h new file mode 100644 index 0000000000..7a7850835b --- /dev/null +++ b/src/southbridge/intel/i82801ax/i82801ax_smbus.h @@ -0,0 +1,183 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2005 Yinghai Lu <yinghailu@gmail.com> + * + * 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; either version 2 of the License, or + * (at your option) any later version. + * + * 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 + */ + +#include <device/smbus_def.h> + +static void smbus_delay(void) +{ + inb(0x80); +} + +static int smbus_wait_until_ready(void) +{ + unsigned loops = SMBUS_TIMEOUT; + unsigned char 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(void) +{ + unsigned loops = SMBUS_TIMEOUT; + unsigned char 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 smbus_wait_until_blk_done(void) +{ + unsigned loops = SMBUS_TIMEOUT; + unsigned char byte; + do { + smbus_delay(); + if (--loops == 0) + break; + byte = inb(SMBUS_IO_BASE + SMBHSTSTAT); + } while ((byte & (1 << 7)) == 0); + return loops ? 0 : -1; +} + +static int do_smbus_read_byte(unsigned device, unsigned address) +{ + unsigned char global_status_register; + unsigned char byte; + + if (smbus_wait_until_ready() < 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() < 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; +} + +/* This function is neither used nor tested by me (Corey Osgood), the author +(Yinghai) probably tested/used it on i82801er */ +static int do_smbus_write_block(unsigned device, unsigned length, unsigned cmd, + unsigned data1, unsigned data2) +{ +#warning "do_smbus_write_block is commented out" + print_err("Untested smbus_write_block called\r\n"); +#if 0 + unsigned char global_control_register; + unsigned char global_status_register; + unsigned char byte; + unsigned char stat; + int i; + + /* Clear the PM timeout flags, SECOND_TO_STS */ + outw(inw(0x0400 + 0x66), 0x0400 + 0x66); + + if (smbus_wait_until_ready(SMBUS_IO_BASE) < 0) { + return -2; + } + + /* Setup transaction */ + /* Obtain ownership */ + outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), SMBUS_IO_BASE + SMBHSTSTAT); + for (stat = 0; (stat & 0x40) == 0;) { + stat = inb(SMBUS_IO_BASE + SMBHSTSTAT); + } + /* Clear the done bit */ + outb(0x80, SMBUS_IO_BASE + SMBHSTSTAT); + /* Disable interrupts */ + outb(inb(SMBUS_IO_BASE + SMBHSTCTL) & (~1), SMBUS_IO_BASE + SMBHSTCTL); + + /* Set the device I'm talking too */ + outb(((device & 0x7f) << 1), SMBUS_IO_BASE + SMBXMITADD); + + /* Set the command address */ + outb(cmd & 0xff, SMBUS_IO_BASE + SMBHSTCMD); + + /* Set the block length */ + outb(length & 0xff, SMBUS_IO_BASE + SMBHSTDAT0); + + /* Try sending out the first byte of data here */ + byte = (data1 >> (0)) & 0x0ff; + outb(byte, SMBUS_IO_BASE + SMBBLKDAT); + /* Issue a block write command */ + outb((inb(SMBUS_IO_BASE + SMBHSTCTL) & 0xe3) | (0x5 << 2) | 0x40, + SMBUS_IO_BASE + SMBHSTCTL); + + for (i = 0; i < length; i++) { + + /* Poll for transaction completion */ + if (smbus_wait_until_blk_done(SMBUS_IO_BASE) < 0) { + return -3; + } + + /* Load the next byte */ + if (i > 3) + byte = (data2 >> (i % 4)) & 0x0ff; + else + byte = (data1 >> (i)) & 0x0ff; + outb(byte, SMBUS_IO_BASE + SMBBLKDAT); + + /* Clear the done bit */ + outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), + SMBUS_IO_BASE + SMBHSTSTAT); + } + + print_debug("SMBUS Block complete\r\n"); + return 0; +#endif +} |