Initial revision

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);
+}
+
+/*----------------------------------------------------------------------------*/