From fe8c2806cdba70479e351299881a395dc2be7785 Mon Sep 17 00:00:00 2001
From: wdenk <wdenk>
Date: Sun, 3 Nov 2002 00:38:21 +0000
Subject: Initial revision

---
 board/esd/dasa_sim/eeprom.c | 181 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 181 insertions(+)
 create mode 100644 board/esd/dasa_sim/eeprom.c

(limited to 'board/esd/dasa_sim')

diff --git a/board/esd/dasa_sim/eeprom.c b/board/esd/dasa_sim/eeprom.c
new file mode 100644
index 0000000..59ef1d6
--- /dev/null
+++ b/board/esd/dasa_sim/eeprom.c
@@ -0,0 +1,181 @@
+/*
+ * (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++);
+    }
+}
-- 
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