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authorwdenk <wdenk>2002-11-03 00:38:21 +0000
committerwdenk <wdenk>2002-11-03 00:38:21 +0000
commitfe8c2806cdba70479e351299881a395dc2be7785 (patch)
treea1e8b98a1838cba6e6f5c765d9d85339257c45f5 /board/esd/dasa_sim/eeprom.c
parentf9087a3213cc245cf9b90436475b5af822bd7579 (diff)
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Initial revision
Diffstat (limited to 'board/esd/dasa_sim/eeprom.c')
-rw-r--r--board/esd/dasa_sim/eeprom.c181
1 files changed, 181 insertions, 0 deletions
diff --git a/board/esd/dasa_sim/eeprom.c b/board/esd/dasa_sim/eeprom.c
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+++ b/board/esd/dasa_sim/eeprom.c
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+/*
+ * (C) Copyright 2001
+ * Stefan Roese, esd gmbh germany, stefan.roese@esd-electronics.com
+ *
+ * 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 <command.h>
+
+
+#define EEPROM_CAP 0x50000358
+#define EEPROM_DATA 0x5000035c
+
+
+unsigned int eepromReadLong(int offs)
+{
+ unsigned int value;
+ volatile unsigned short ret;
+ int count;
+
+ *(unsigned short *)EEPROM_CAP = offs;
+
+ count = 0;
+
+ for (;;)
+ {
+ count++;
+ ret = *(unsigned short *)EEPROM_CAP;
+
+ if ((ret & 0x8000) != 0)
+ break;
+ }
+
+ value = *(unsigned long *)EEPROM_DATA;
+
+ return value;
+}
+
+
+unsigned char eepromReadByte(int offs)
+{
+ unsigned int valueLong;
+ unsigned char *ptr;
+
+ valueLong = eepromReadLong(offs & ~3);
+ ptr = (unsigned char *)&valueLong;
+
+ return ptr[offs & 3];
+}
+
+
+void eepromWriteLong(int offs, unsigned int value)
+{
+ volatile unsigned short ret;
+ int count;
+
+ count = 0;
+
+ *(unsigned long *)EEPROM_DATA = value;
+ *(unsigned short *)EEPROM_CAP = 0x8000 + offs;
+
+ for (;;)
+ {
+ count++;
+ ret = *(unsigned short *)EEPROM_CAP;
+
+ if ((ret & 0x8000) == 0)
+ break;
+ }
+}
+
+
+void eepromWriteByte(int offs, unsigned char valueByte)
+{
+ unsigned int valueLong;
+ unsigned char *ptr;
+
+ valueLong = eepromReadLong(offs & ~3);
+ ptr = (unsigned char *)&valueLong;
+
+ ptr[offs & 3] = valueByte;
+
+ eepromWriteLong(offs & ~3, valueLong);
+}
+
+
+void i2c_read (uchar *addr, int alen, uchar *buffer, int len)
+{
+ int i;
+ int len2, ptr;
+
+ /* printf("\naddr=%x alen=%x buffer=%x len=%x", addr[0], addr[1], *(short *)addr, alen, buffer, len); // test-only */
+
+ ptr = *(short *)addr;
+
+ /*
+ * Read till lword boundary
+ */
+ len2 = 4 - (*(short *)addr & 0x0003);
+ for (i=0; i<len2; i++)
+ {
+ *buffer++ = eepromReadByte(ptr++);
+ }
+
+ /*
+ * Read all lwords
+ */
+ len2 = (len - len2) >> 2;
+ for (i=0; i<len2; i++)
+ {
+ *(unsigned int *)buffer = eepromReadLong(ptr);
+ buffer += 4;
+ ptr += 4;
+ }
+
+ /*
+ * Read last bytes
+ */
+ len2 = (*(short *)addr + len) & 0x0003;
+ for (i=0; i<len2; i++)
+ {
+ *buffer++ = eepromReadByte(ptr++);
+ }
+}
+
+void i2c_write (uchar *addr, int alen, uchar *buffer, int len)
+{
+ int i;
+ int len2, ptr;
+
+ /* printf("\naddr=%x alen=%x buffer=%x len=%x", addr[0], addr[1], *(short *)addr, alen, buffer, len); // test-only */
+
+ ptr = *(short *)addr;
+
+ /*
+ * Write till lword boundary
+ */
+ len2 = 4 - (*(short *)addr & 0x0003);
+ for (i=0; i<len2; i++)
+ {
+ eepromWriteByte(ptr++, *buffer++);
+ }
+
+ /*
+ * Write all lwords
+ */
+ len2 = (len - len2) >> 2;
+ for (i=0; i<len2; i++)
+ {
+ eepromWriteLong(ptr, *(unsigned int *)buffer);
+ buffer += 4;
+ ptr += 4;
+ }
+
+ /*
+ * Write last bytes
+ */
+ len2 = (*(short *)addr + len) & 0x0003;
+ for (i=0; i<len2; i++)
+ {
+ eepromWriteByte(ptr++, *buffer++);
+ }
+}