patch-2.3.20 linux/arch/ppc/mbxboot/embed_config.c

• Lines: 208
• Date: Thu Oct 7 10:17:08 1999
• Orig file: v2.3.19/linux/arch/ppc/mbxboot/embed_config.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.19/linux/arch/ppc/mbxboot/embed_config.c linux/arch/ppc/mbxboot/embed_config.c
@@ -0,0 +1,207 @@
+
+/* Board specific functions for those embedded 8xx boards that do
+ * not have boot monitor support for board information.
+ */
+#include <sys/types.h>
+#include "asm/mpc8xx.h"
+
+
+/* IIC functions.
+ * These are just the basic master read/write operations so we can
+ * examine serial EEPROM.
+ */
+extern void	iic_read(uint devaddr, u_char *buf, uint offset, uint count);
+extern u_char	aschex_to_byte(u_char *cp);
+
+static void	rpx_eth(bd_t *bd, u_char *cp);
+static void	rpx_brate(bd_t *bd, u_char *cp);
+static void	rpx_memsize(bd_t *bd, u_char *cp);
+static void	rpx_cpuspeed(bd_t *bd, u_char *cp);
+
+/* Read the EEPROM on the RPX-Lite board.
+*/
+void
+rpx_cfg(bd_t *bd)
+{
+	u_char	eebuf[256], *cp;
+
+	/* Read the first 256 bytes of the EEPROM.  I think this
+	 * is really all there is, and I hope if it gets bigger the
+	 * info we want is still up front.
+	 */
+#if 1
+	iic_read(0xa8, eebuf, 0, 128);
+	iic_read(0xa8, &eebuf[128], 128, 128);
+	{
+		int i;
+		cp = (u_char *)0xfa000000;
+
+		for (i=0; i<256; i++)
+			*cp++ = eebuf[i];
+	}
+
+	/* We look for two things, the Ethernet address and the
+	 * serial baud rate.  The records are separated by
+	 * newlines.
+	 */
+	cp = eebuf;
+	for (;;) {
+		if (*cp == 'E') {
+			cp++;
+			if (*cp == 'A') {
+				cp += 2;
+				rpx_eth(bd, cp);
+			}
+		}
+		if (*cp == 'S') {
+			cp++;
+			if (*cp == 'B') {
+				cp += 2;
+				rpx_brate(bd, cp);
+			}
+		}
+		if (*cp == 'D') {
+			cp++;
+			if (*cp == '1') {
+				cp += 2;
+				rpx_memsize(bd, cp);
+			}
+		}
+		if (*cp == 'H') {
+			cp++;
+			if (*cp == 'Z') {
+				cp += 2;
+				rpx_cpuspeed(bd, cp);
+			}
+		}
+
+		/* Scan to the end of the record.
+		*/
+		while ((*cp != '\n') && (*cp != 0xff))
+			cp++;
+
+		/* If the next character is a 0 or ff, we are done.
+		*/
+		cp++;
+		if ((*cp == 0) || (*cp == 0xff))
+			break;
+	}
+	bd->bi_memstart = 0;
+
+#else
+	bd->bi_memstart = 0;
+	bd->bi_memsize = (4 * 1024 * 1024);
+	bd->bi_intfreq = 48;
+	bd->bi_busfreq = 48;
+	bd->bi_baudrate = 9600;
+#endif
+}
+
+static void
+rpx_eth(bd_t *bd, u_char *cp)
+{
+	int	i;
+
+	for (i=0; i<6; i++) {
+		bd->bi_enetaddr[i] = aschex_to_byte(cp);
+		cp += 2;
+	}
+}
+
+static void
+rpx_brate(bd_t *bd, u_char *cp)
+{
+	uint	rate;
+
+	rate = 0;
+
+	while (*cp != '\n') {
+		rate *= 10;
+		rate += (*cp) - '0';
+		cp++;
+	}
+
+	bd->bi_baudrate = rate * 100;
+}
+
+static void
+rpx_memsize(bd_t *bd, u_char *cp)
+{
+	uint	size;
+
+	size = 0;
+
+	while (*cp != '\n') {
+		size *= 10;
+		size += (*cp) - '0';
+		cp++;
+	}
+
+	bd->bi_memsize = size * 1024 * 1024;
+}
+
+static void
+rpx_cpuspeed(bd_t *bd, u_char *cp)
+{
+	uint	num, den;
+
+	num = den = 0;
+
+	while (*cp != '\n') {
+		num *= 10;
+		num += (*cp) - '0';
+		cp++;
+		if (*cp == '/') {
+			cp++;
+			den = (*cp) - '0';
+			break;
+		}
+	}
+
+	/* I don't know why the RPX just can't state the actual
+	 * CPU speed.....
+	 */
+	if (den) {
+		num /= den;
+		num *= den;
+	}
+	bd->bi_intfreq = bd->bi_busfreq = num;
+
+	/* The 8xx can only run a maximum 50 MHz bus speed (until
+	 * Motorola changes this :-).  Greater than 50 MHz parts
+	 * run internal/2 for bus speed.
+	 */
+	if (num > 50)
+		bd->bi_busfreq /= 2;
+}
+
+/* Build a board information structure for the BSE ip-Engine.
+ * There is more to come since we will add some environment
+ * variables and a function to read them.
+ */
+void
+bseip_cfg(bd_t *bd)
+{
+	u_char	*cp;
+	int	i;
+
+	/* Baud rate and processor speed will eventually come
+	 * from the environment variables.
+	 */
+	bd->bi_baudrate = 9600;
+
+	/* Get the Ethernet station address from the Flash ROM.
+	*/
+	cp = (u_char *)0xfe003ffa;
+	for (i=0; i<6; i++) {
+		bd->bi_enetaddr[i] = *cp++;
+	}
+
+	/* The rest of this should come from the environment as well.
+	*/
+	bd->bi_memstart = 0;
+	bd->bi_memsize = (16 * 1024 * 1024);
+	bd->bi_intfreq = 48;
+	bd->bi_busfreq = 48;
+}
+