+++ /dev/null
-/*
- * (C) Copyright 2002 ELTEC Elektronik AG
- * Frank Gottschling <fgottschling@eltec.de>
- *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * 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., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
- */
-
-#include <common.h>
-#include "srom.h"
-
-/*----------------------------------------------------------------------------*/
-/*
- * START sequence
- * _ _________
- * SCLK _> \____
- * _ ____
- * SDIO _> \_________
- * : : :
- */
-static void eepStart (void)
-{
- out8(I2C_BUS_DAT, 0x60); /* SCLK = high SDIO = high */
- out8(I2C_BUS_DIR, 0x60); /* set output direction for SCLK/SDIO */
- udelay(10);
- out8(I2C_BUS_DAT, 0x40); /* SCLK = high SDIO = low */
- udelay(10);
- out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = low */
- udelay(10);
-}
-
-/*----------------------------------------------------------------------------*/
-/*
- * STOP sequence
- * _______
- * SCLK _____/
- * _ ___
- * SDIO _>_______/
- * : : :
- */
-static void eepStop (void)
-{
- out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = low */
- out8(I2C_BUS_DIR, 0x60); /* set output direction for SCLK/SDIO */
- udelay(10);
- out8(I2C_BUS_DAT, 0x40); /* SCLK = high SDIO = low */
- udelay(10);
- out8(I2C_BUS_DAT, 0x60); /* SCLK = high SDIO = high */
- udelay(10);
- out8(I2C_BUS_DIR, 0x00); /* reset to input direction */
-}
-
-/*----------------------------------------------------------------------------*/
-/*
- * Read one byte from EEPROM
- * ___ ___ ___ ___ ___ ___ ___ ___
- * SCLK ___/ \___/ \___/ \___/ \___/ \___/ \___/ \___/ \
- * _________________________________________________________________
- * SDIO > ^ ^ ^ ^ ^ ^ ^ ^
- * : : : : : : : : : : : : : : : : :
- */
-static unsigned char eepReadByte (void)
-{
- register unsigned char buf = 0x00;
- register int i;
-
- out8(I2C_BUS_DIR, 0x40);
-
- for (i = 0; i < 8; i++)
- {
- out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = high */
- udelay(10);
- out8(I2C_BUS_DAT, 0x40); /* SCLK = high SDIO = high */
- udelay(15);
- buf <<= 1;
- buf = (in8(I2C_BUS_DAT) & 0x20) ? (buf | 0x01) : (buf & 0xFE);
- out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = high */
- udelay(10);
- }
- return(buf);
-}
-
-/*----------------------------------------------------------------------------*/
-/*
- * Write one byte to EEPROM
- * ___ ___ ___ ___ ___ ___ ___ ___
- * SCLK __/ \___/ \___/ \___/ \___/ \___/ \___/ \___/ \__
- * _______ _______ _______ _______ _______ _______ _______ ________
- * SDIO X_______X_______X_______X_______X_______X_______X_______X________
- * : 7 : 6 : 5 : 4 : 3 : 2 : 1 : 0
- */
-static void eepWriteByte (register unsigned char buf)
-{
- register int i;
-
- (buf & 0x80) ? out8(I2C_BUS_DAT, 0x20) : out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = data */
- out8(I2C_BUS_DIR, 0x60);
-
- for (i = 7; i >= 0; i--)
- {
- (buf & 0x80) ? out8(I2C_BUS_DAT, 0x20) : out8(I2C_BUS_DAT, 0x00); /* SCLK=low SDIO=data */
- udelay(10);
- (buf & 0x80) ? out8(I2C_BUS_DAT, 0x60) : out8(I2C_BUS_DAT, 0x40); /* SCLK=high SDIO=data */
- udelay(15);
- (buf & 0x80) ? out8(I2C_BUS_DAT, 0x20) : out8(I2C_BUS_DAT, 0x00); /* SCLK=low SDIO=data */
- udelay(10);
- buf <<= 1;
- }
-}
-
-/*----------------------------------------------------------------------------*/
-/*
- * Read data acknowledge of EEPROM
- * _______
- * SCLK ____/ \___
- * _______________
- * SDIO >
- * : : ^ :
- */
-static int eepReadAck (void)
-{
- int retval;
-
- out8(I2C_BUS_DIR, 0x40);
- out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = high */
- udelay(10);
- out8(I2C_BUS_DAT, 0x40); /* SCLK = high SDIO = high */
- udelay(10);
- retval = (in8(I2C_BUS_DAT) & 0x20) ? ERROR : 0;
- udelay(10);
- out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = high */
- udelay(10);
-
- return(retval);
-}
-
-/*----------------------------------------------------------------------------*/
-/*
- * Write data acknowledge to EEPROM
- * _______
- * SCLK ____/ \___
- *
- * SDIO >_______________
- * : : :
- */
-static void eepWriteAck (unsigned char ack)
-{
- ack ? out8(I2C_BUS_DAT, 0x20) : out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = ack */
- out8(I2C_BUS_DIR, 0x60);
- udelay(10);
- ack ? out8(I2C_BUS_DAT, 0x60) : out8(I2C_BUS_DAT, 0x40); /* SCLK = high SDIO = ack */
- udelay(15);
- ack ? out8(I2C_BUS_DAT, 0x20) : out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = ack */
- udelay(10);
-}
-
-/*----------------------------------------------------------------------------*/
-/*
- * Read bytes from EEPROM
- */
-int el_srom_load (addr, buf, cnt, device, block)
-unsigned char addr;
-unsigned char *buf;
-int cnt;
-unsigned char device;
-unsigned char block;
-{
- register int i;
-
- for (i=0;i<cnt;i++)
- {
- eepStart();
- eepWriteByte(0xA0 | device | block);
- if (eepReadAck() == ERROR)
- {
- eepStop();
- return(ERROR);
- }
- eepWriteByte(addr++);
- if (eepReadAck() == ERROR)
- {
- eepStop();
- return(ERROR);
- }
- eepStart();
-
- eepWriteByte(0xA1 | device | block);
- if (eepReadAck() == ERROR)
- {
- eepStop();
- return(ERROR);
- }
-
- *buf++ = eepReadByte();
- eepWriteAck(1);
- eepStop();
-
- if ((addr == 0) && (i != (cnt-1))) /* is it the same block ? */
- {
- if (block == FIRST_BLOCK)
- block = SECOND_BLOCK;
- else
- return(ERROR);
- }
- }
- return(cnt);
-}
-
-/*----------------------------------------------------------------------------*/
-/*
- *
- * Write bytes to EEPROM
- *
- */
-int el_srom_store (addr, buf, cnt, device, block)
-unsigned char addr, *buf, device, block;
-int cnt;
-{
- register int i, retVal;
-
- for (i=0;i<cnt;i++)
- {
- retVal = ERROR;
- do
- {
- eepStart();
- eepWriteByte(0xA0 | device | block);
- if ((retVal = eepReadAck()) == ERROR)
- eepStop();
- } while (retVal == ERROR);
-
- eepWriteByte(addr++);
- if (eepReadAck() == ERROR) return(ERROR);
-
- if ((addr == 0) && (i != (cnt-1))) /* is it the same block ? */
- {
- if (block == FIRST_BLOCK)
- block = SECOND_BLOCK;
- else
- return(ERROR);
- }
-
- eepWriteByte(*buf++);
- if (eepReadAck() == ERROR)
- return(ERROR);
-
- eepStop();
- }
- return(cnt);
-}
-
-/*----------------------------------------------------------------------------*/
-/*
- * calculate checksum for ELTEC revision srom
- */
-unsigned long el_srom_checksum (ptr, size)
-register unsigned char *ptr;
-unsigned long size;
-{
- u_long f, accu = 0;
- u_int i;
- u_char byte;
-
- for (; size; size--)
- {
- byte = *ptr++;
- for (i = 8; i; i--)
- {
- f = ((byte & 1) ^ (accu & 1)) ? 0x84083001 : 0;
- accu >>= 1; accu ^= f;
- byte >>= 1;
- }
- }
- return(accu);
-}
-
-/*----------------------------------------------------------------------------*/
projects / karo-tx-uboot.git / blobdiff