Initial revision

1 files changed, 210 insertions, 0 deletions

diff --git a/examples/eepro100_eeprom.c b/examples/eepro100_eeprom.c
new file mode 100644
index 0000000..656b238
--- /dev/null
+++ b/examples/eepro100_eeprom.c
@@ -0,0 +1,210 @@
+/*
+ * Copyright 1998-2001 by Donald Becker.
+ * This software may be used and distributed according to the terms of
+ * the GNU General Public License (GPL), incorporated herein by reference.
+ * Contact the author for use under other terms.
+ *
+ * This program must be compiled with "-O"!
+ * See the bottom of this file for the suggested compile-command.
+ *
+ * The author may be reached as becker@scyld.com, or C/O
+ *  Scyld Computing Corporation
+ *  410 Severn Ave., Suite 210
+ *  Annapolis MD 21403
+ *
+ * Common-sense licensing statement: Using any portion of this program in
+ * your own program means that you must give credit to the original author
+ * and release the resulting code under the GPL.
+ */
+
+#define _PPC_STRING_H_		/* avoid unnecessary str/mem functions */
+#define _LINUX_STRING_H_	/* avoid unnecessary str/mem functions */
+
+#include <common.h>
+#include <syscall.h>
+
+static int reset_eeprom(unsigned long ioaddr, unsigned char *hwaddr);
+
+int eepro100_eeprom(void)
+{
+	int ret = 0;
+
+	unsigned char hwaddr1[6] = { 0x00, 0x00, 0x02, 0x03, 0x04, 0x05 };
+	unsigned char hwaddr2[6] = { 0x00, 0x00, 0x02, 0x03, 0x04, 0x06 };
+
+#if defined(CONFIG_OXC)
+	ret |= reset_eeprom(0x80000000, hwaddr1);
+	ret |= reset_eeprom(0x81000000, hwaddr2);
+#endif
+
+	return ret;
+}
+
+/* Default EEPROM for i82559 */
+static unsigned short default_eeprom[64] = {
+	0x0100, 0x0302, 0x0504, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
+	0xffff, 0xffff, 0x40c0, 0x0000, 0x0000, 0xffff, 0xffff, 0xffff,
+	0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
+	0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
+	0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
+	0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
+	0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
+	0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff
+};
+
+static unsigned short eeprom[256];
+
+static int eeprom_size = 64;
+static int eeprom_addr_size = 6;
+
+static int debug = 0;
+
+static inline unsigned short swap16(unsigned short x)
+{
+	return (((x & 0xff) << 8) | ((x & 0xff00) >> 8));
+}
+
+static inline void outw(short data, long addr)
+{
+	*(volatile short *)(addr) = swap16(data);
+}
+
+static inline short inw(long addr)
+{
+	return swap16(*(volatile short *)(addr));
+}
+
+static inline void *memcpy(void *dst, const void *src, unsigned int len)
+{
+	void * ret = dst;
+	while (len-- > 0) *((char *)dst)++ = *((char *)src)++;
+	return ret;
+}
+
+/* The EEPROM commands include the alway-set leading bit. */
+#define EE_WRITE_CMD	(5)
+#define EE_READ_CMD		(6)
+#define EE_ERASE_CMD	(7)
+
+/* Serial EEPROM section. */
+#define EE_SHIFT_CLK	0x01	/* EEPROM shift clock. */
+#define EE_CS			0x02	/* EEPROM chip select. */
+#define EE_DATA_WRITE	0x04	/* EEPROM chip data in. */
+#define EE_DATA_READ	0x08	/* EEPROM chip data out. */
+#define EE_ENB			(0x4800 | EE_CS)
+#define EE_WRITE_0		0x4802
+#define EE_WRITE_1		0x4806
+#define EE_OFFSET		14
+
+/* Delay between EEPROM clock transitions. */
+#define eeprom_delay(ee_addr)	inw(ee_addr)
+
+/* Wait for the EEPROM to finish the previous operation. */
+static int eeprom_busy_poll(long ee_ioaddr)
+{
+	int i;
+	outw(EE_ENB, ee_ioaddr);
+	for (i = 0; i < 10000; i++)			/* Typical 2000 ticks */
+		if (inw(ee_ioaddr) & EE_DATA_READ)
+			break;
+	return i;
+}
+
+/* This executes a generic EEPROM command, typically a write or write enable.
+   It returns the data output from the EEPROM, and thus may also be used for
+   reads. */
+static int do_eeprom_cmd(long ioaddr, int cmd, int cmd_len)
+{
+	unsigned retval = 0;
+	long ee_addr = ioaddr + EE_OFFSET;
+
+	if (debug > 1)
+		mon_printf(" EEPROM op 0x%x: ", cmd);
+
+	outw(EE_ENB | EE_SHIFT_CLK, ee_addr);
+
+	/* Shift the command bits out. */
+	do {
+		short dataval = (cmd & (1 << cmd_len)) ? EE_WRITE_1 : EE_WRITE_0;
+		outw(dataval, ee_addr);
+		eeprom_delay(ee_addr);
+		if (debug > 2)
+			mon_printf("%X", inw(ee_addr) & 15);
+		outw(dataval | EE_SHIFT_CLK, ee_addr);
+		eeprom_delay(ee_addr);
+		retval = (retval << 1) | ((inw(ee_addr) & EE_DATA_READ) ? 1 : 0);
+	} while (--cmd_len >= 0);
+#if 0
+	outw(EE_ENB, ee_addr);
+#endif
+	/* Terminate the EEPROM access. */
+	outw(EE_ENB & ~EE_CS, ee_addr);
+	if (debug > 1)
+		mon_printf(" EEPROM result is 0x%5.5x.\n", retval);
+	return retval;
+}
+
+static int read_eeprom(long ioaddr, int location, int addr_len)
+{
+	return do_eeprom_cmd(ioaddr, ((EE_READ_CMD << addr_len) | location)
+		<< 16 , 3 + addr_len + 16) & 0xffff;
+}
+
+static void write_eeprom(long ioaddr, int index, int value, int addr_len)
+{
+	long ee_ioaddr = ioaddr + EE_OFFSET;
+	int i;
+
+	/* Poll for previous op finished. */
+	eeprom_busy_poll(ee_ioaddr);			/* Typical 0 ticks */
+	/* Enable programming modes. */
+	do_eeprom_cmd(ioaddr, (0x4f << (addr_len-4)), 3 + addr_len);
+	/* Do the actual write. */
+	do_eeprom_cmd(ioaddr,
+				  (((EE_WRITE_CMD<<addr_len) | index)<<16) | (value & 0xffff),
+				  3 + addr_len + 16);
+	/* Poll for write finished. */
+	i = eeprom_busy_poll(ee_ioaddr);			/* Typical 2000 ticks */
+	if (debug)
+		mon_printf(" Write finished after %d ticks.\n", i);
+	/* Disable programming. This command is not instantaneous, so we check
+	   for busy before the next op. */
+	do_eeprom_cmd(ioaddr, (0x40 << (addr_len-4)), 3 + addr_len);
+	eeprom_busy_poll(ee_ioaddr);
+}
+
+static int reset_eeprom(unsigned long ioaddr, unsigned char *hwaddr)
+{
+	unsigned short checksum = 0;
+	int size_test;
+	int i;
+
+	mon_printf("Resetting i82559 EEPROM @ 0x%08x ... ", ioaddr);
+
+	size_test = do_eeprom_cmd(ioaddr, (EE_READ_CMD << 8) << 16, 27);
+	eeprom_addr_size = (size_test & 0xffe0000) == 0xffe0000 ? 8 : 6;
+	eeprom_size = 1 << eeprom_addr_size;
+
+	memcpy(eeprom, default_eeprom, sizeof default_eeprom);
+
+	for (i = 0; i < 3; i++)
+		eeprom[i] = (hwaddr[i*2+1]<<8) + hwaddr[i*2];
+
+	/* Recalculate the checksum. */
+	for (i = 0; i < eeprom_size - 1; i++)
+		checksum += eeprom[i];
+	eeprom[i] = 0xBABA - checksum;
+
+	for (i = 0; i < eeprom_size; i++)
+		write_eeprom(ioaddr, i, eeprom[i], eeprom_addr_size);
+
+	for (i = 0; i < eeprom_size; i++)
+		if (read_eeprom(ioaddr, i, eeprom_addr_size) != eeprom[i]) {
+			mon_printf("failed\n");
+			return 1;
+		}
+
+	mon_printf("done\n");
+	return 0;
+}
+