summaryrefslogtreecommitdiffstats
path: root/board/eltec/bab7xx/el_srom.c
diff options
context:
space:
mode:
Diffstat (limited to 'board/eltec/bab7xx/el_srom.c')
-rw-r--r--board/eltec/bab7xx/el_srom.c292
1 files changed, 292 insertions, 0 deletions
diff --git a/board/eltec/bab7xx/el_srom.c b/board/eltec/bab7xx/el_srom.c
new file mode 100644
index 0000000..56abdc7
--- /dev/null
+++ b/board/eltec/bab7xx/el_srom.c
@@ -0,0 +1,292 @@
+/*
+ * (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);
+}
+
+/*----------------------------------------------------------------------------*/
generated by cgit v1.1 at 2024-12-26 14:14:28 +0000