mirror of
https://github.com/AsahiLinux/u-boot
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292 lines
8.1 KiB
C
292 lines
8.1 KiB
C
/*
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* (C) Copyright 2002 ELTEC Elektronik AG
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* Frank Gottschling <fgottschling@eltec.de>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include "srom.h"
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/*----------------------------------------------------------------------------*/
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/*
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* START sequence
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* _ _________
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* SCLK _> \____
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* _ ____
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* SDIO _> \_________
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* : : :
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*/
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static void eepStart (void)
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{
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out8(I2C_BUS_DAT, 0x60); /* SCLK = high SDIO = high */
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out8(I2C_BUS_DIR, 0x60); /* set output direction for SCLK/SDIO */
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udelay(10);
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out8(I2C_BUS_DAT, 0x40); /* SCLK = high SDIO = low */
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udelay(10);
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out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = low */
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udelay(10);
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}
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/*----------------------------------------------------------------------------*/
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/*
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* STOP sequence
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* _______
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* SCLK _____/
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* _ ___
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* SDIO _>_______/
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* : : :
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*/
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static void eepStop (void)
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{
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out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = low */
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out8(I2C_BUS_DIR, 0x60); /* set output direction for SCLK/SDIO */
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udelay(10);
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out8(I2C_BUS_DAT, 0x40); /* SCLK = high SDIO = low */
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udelay(10);
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out8(I2C_BUS_DAT, 0x60); /* SCLK = high SDIO = high */
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udelay(10);
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out8(I2C_BUS_DIR, 0x00); /* reset to input direction */
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}
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/*----------------------------------------------------------------------------*/
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/*
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* Read one byte from EEPROM
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* ___ ___ ___ ___ ___ ___ ___ ___
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* SCLK ___/ \___/ \___/ \___/ \___/ \___/ \___/ \___/ \
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* _________________________________________________________________
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* SDIO > ^ ^ ^ ^ ^ ^ ^ ^
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* : : : : : : : : : : : : : : : : :
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*/
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static unsigned char eepReadByte (void)
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{
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register unsigned char buf = 0x00;
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register int i;
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out8(I2C_BUS_DIR, 0x40);
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for (i = 0; i < 8; i++)
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{
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out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = high */
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udelay(10);
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out8(I2C_BUS_DAT, 0x40); /* SCLK = high SDIO = high */
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udelay(15);
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buf <<= 1;
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buf = (in8(I2C_BUS_DAT) & 0x20) ? (buf | 0x01) : (buf & 0xFE);
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out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = high */
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udelay(10);
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}
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return(buf);
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}
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/*----------------------------------------------------------------------------*/
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/*
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* Write one byte to EEPROM
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* ___ ___ ___ ___ ___ ___ ___ ___
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* SCLK __/ \___/ \___/ \___/ \___/ \___/ \___/ \___/ \__
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* _______ _______ _______ _______ _______ _______ _______ ________
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* SDIO X_______X_______X_______X_______X_______X_______X_______X________
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* : 7 : 6 : 5 : 4 : 3 : 2 : 1 : 0
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*/
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static void eepWriteByte (register unsigned char buf)
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{
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register int i;
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(buf & 0x80) ? out8(I2C_BUS_DAT, 0x20) : out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = data */
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out8(I2C_BUS_DIR, 0x60);
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for (i = 7; i >= 0; i--)
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{
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(buf & 0x80) ? out8(I2C_BUS_DAT, 0x20) : out8(I2C_BUS_DAT, 0x00); /* SCLK=low SDIO=data */
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udelay(10);
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(buf & 0x80) ? out8(I2C_BUS_DAT, 0x60) : out8(I2C_BUS_DAT, 0x40); /* SCLK=high SDIO=data */
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udelay(15);
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(buf & 0x80) ? out8(I2C_BUS_DAT, 0x20) : out8(I2C_BUS_DAT, 0x00); /* SCLK=low SDIO=data */
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udelay(10);
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buf <<= 1;
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}
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}
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/*----------------------------------------------------------------------------*/
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/*
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* Read data acknowledge of EEPROM
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* _______
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* SCLK ____/ \___
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* _______________
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* SDIO >
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* : : ^ :
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*/
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static int eepReadAck (void)
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{
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int retval;
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out8(I2C_BUS_DIR, 0x40);
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out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = high */
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udelay(10);
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out8(I2C_BUS_DAT, 0x40); /* SCLK = high SDIO = high */
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udelay(10);
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retval = (in8(I2C_BUS_DAT) & 0x20) ? ERROR : 0;
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udelay(10);
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out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = high */
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udelay(10);
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return(retval);
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}
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/*----------------------------------------------------------------------------*/
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/*
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* Write data acknowledge to EEPROM
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* _______
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* SCLK ____/ \___
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*
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* SDIO >_______________
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* : : :
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*/
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static void eepWriteAck (unsigned char ack)
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{
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ack ? out8(I2C_BUS_DAT, 0x20) : out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = ack */
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out8(I2C_BUS_DIR, 0x60);
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udelay(10);
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ack ? out8(I2C_BUS_DAT, 0x60) : out8(I2C_BUS_DAT, 0x40); /* SCLK = high SDIO = ack */
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udelay(15);
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ack ? out8(I2C_BUS_DAT, 0x20) : out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = ack */
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udelay(10);
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}
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/*----------------------------------------------------------------------------*/
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/*
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* Read bytes from EEPROM
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*/
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int el_srom_load (addr, buf, cnt, device, block)
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unsigned char addr;
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unsigned char *buf;
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int cnt;
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unsigned char device;
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unsigned char block;
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{
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register int i;
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for (i=0;i<cnt;i++)
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{
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eepStart();
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eepWriteByte(0xA0 | device | block);
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if (eepReadAck() == ERROR)
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{
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eepStop();
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return(ERROR);
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}
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eepWriteByte(addr++);
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if (eepReadAck() == ERROR)
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{
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eepStop();
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return(ERROR);
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}
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eepStart();
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eepWriteByte(0xA1 | device | block);
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if (eepReadAck() == ERROR)
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{
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eepStop();
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return(ERROR);
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}
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*buf++ = eepReadByte();
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eepWriteAck(1);
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eepStop();
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if ((addr == 0) && (i != (cnt-1))) /* is it the same block ? */
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{
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if (block == FIRST_BLOCK)
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block = SECOND_BLOCK;
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else
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return(ERROR);
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}
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}
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return(cnt);
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}
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/*----------------------------------------------------------------------------*/
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/*
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*
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* Write bytes to EEPROM
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*
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*/
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int el_srom_store (addr, buf, cnt, device, block)
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unsigned char addr, *buf, device, block;
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int cnt;
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{
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register int i, retVal;
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for (i=0;i<cnt;i++)
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{
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retVal = ERROR;
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do
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{
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eepStart();
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eepWriteByte(0xA0 | device | block);
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if ((retVal = eepReadAck()) == ERROR)
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eepStop();
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} while (retVal == ERROR);
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eepWriteByte(addr++);
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if (eepReadAck() == ERROR) return(ERROR);
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if ((addr == 0) && (i != (cnt-1))) /* is it the same block ? */
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{
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if (block == FIRST_BLOCK)
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block = SECOND_BLOCK;
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else
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return(ERROR);
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}
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eepWriteByte(*buf++);
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if (eepReadAck() == ERROR)
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return(ERROR);
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eepStop();
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}
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return(cnt);
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}
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/*----------------------------------------------------------------------------*/
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/*
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* calculate checksum for ELTEC revision srom
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*/
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unsigned long el_srom_checksum (ptr, size)
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register unsigned char *ptr;
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unsigned long size;
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{
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u_long f, accu = 0;
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u_int i;
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u_char byte;
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for (; size; size--)
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{
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byte = *ptr++;
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for (i = 8; i; i--)
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{
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f = ((byte & 1) ^ (accu & 1)) ? 0x84083001 : 0;
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accu >>= 1; accu ^= f;
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byte >>= 1;
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}
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}
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return(accu);
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}
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/*----------------------------------------------------------------------------*/
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