patch-2.4.5 linux/arch/ppc/boot/mbx/embed_config.c

• Lines: 594
• Date: Thu May 24 15:02:06 2001
• Orig file: v2.4.4/linux/arch/ppc/boot/mbx/embed_config.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.4/linux/arch/ppc/boot/mbx/embed_config.c linux/arch/ppc/boot/mbx/embed_config.c
@@ -0,0 +1,593 @@
+/*
+ * BK Id: SCCS/s.embed_config.c 1.7 05/18/01 07:54:04 patch
+ */
+
+/* Board specific functions for those embedded 8xx boards that do
+ * not have boot monitor support for board information.
+ */
+#include <linux/types.h>
+#include <linux/config.h>
+#ifdef CONFIG_8xx
+#include <asm/mpc8xx.h>
+#endif
+#ifdef CONFIG_8260
+#include <asm/mpc8260.h>
+#include <asm/immap_8260.h>
+#endif
+
+
+/* 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);
+static u_char	aschex_to_byte(u_char *cp);
+
+/* Supply a default Ethernet address for those eval boards that don't
+ * ship with one.  This is an address from the MBX board I have, so
+ * it is unlikely you will find it on your network.
+ */
+static	ushort	def_enet_addr[] = { 0x0800, 0x3e26, 0x1559 };
+
+#if defined(CONFIG_MBX)
+
+/* The MBX hands us a pretty much ready to go board descriptor.  This
+ * is where the idea started in the first place.
+ */
+void
+embed_config(bd_t *bd)
+{
+	u_char	*mp;
+	u_char	eebuf[128];
+	int i;
+
+	/* Read the first 128 bytes of the EEPROM.  There is more,
+	 * but this is all we need.
+	 */
+	iic_read(0xa4, eebuf, 0, 128);
+
+	/* All we are looking for is the Ethernet MAC address.  The
+	 * first 8 bytes are 'MOTOROLA', so check for part of that.
+	 * If it's there, assume we have a valid MAC address.  If not,
+	 * grab our default one.
+	 */
+	if ((*(uint *)eebuf) == 0x4d4f544f)
+		mp = &eebuf[0x4c];
+	else
+		mp = (u_char *)def_enet_addr;
+
+	for (i=0; i<6; i++) {
+		bd->bi_enetaddr[i] = *mp++;
+	}
+
+	/* The boot rom passes these to us in MHz.  Linux now expects
+	 * them to be in Hz.
+	 */
+	bd->bi_intfreq *= 1000000;
+	bd->bi_busfreq *= 1000000;
+
+	/* Stuff a baud rate here as well.
+	*/
+	bd->bi_baudrate = 9600;
+}
+#endif /* CONFIG_MBX */
+
+#if defined(CONFIG_RPXLITE) || defined(CONFIG_RPXCLASSIC) || defined(CONFIG_RPX6)
+
+/* Helper functions for Embedded Planet boards.
+*/
+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 uint
+rpx_baseten(u_char *cp)
+{
+	uint	retval;
+
+	retval = 0;
+
+	while (*cp != '\n') {
+		retval *= 10;
+		retval += (*cp) - '0';
+		cp++;
+	}
+	return(retval);
+}
+
+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 * 1000000;
+
+	/* 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;
+}
+
+/* Because I didn't find anything that would do this.......
+*/
+u_char
+aschex_to_byte(u_char *cp)
+{
+	u_char	byte, c;
+
+	c = *cp++;
+
+	if ((c >= 'A') && (c <= 'F')) {
+		c -= 'A';
+		c += 10;
+	}
+	else if ((c >= 'a') && (c <= 'f')) {
+		c -= 'a';
+		c += 10;
+	}
+	else {
+		c -= '0';
+	}
+	
+	byte = c * 16;
+
+	c = *cp;
+
+	if ((c >= 'A') && (c <= 'F')) {
+		c -= 'A';
+		c += 10;
+	}
+	else if ((c >= 'a') && (c <= 'f')) {
+		c -= 'a';
+		c += 10;
+	}
+	else {
+		c -= '0';
+	}
+	
+	byte += c;
+
+	return(byte);
+}
+#endif
+
+#if defined(CONFIG_RPXLITE) || defined(CONFIG_RPXCLASSIC)
+
+/* Read the EEPROM on the RPX-Lite board.
+*/
+void
+embed_config(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);
+
+	/* 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
+	/* For boards without initialized EEPROM.
+	*/
+	bd->bi_memstart = 0;
+	bd->bi_memsize = (8 * 1024 * 1024);
+	bd->bi_intfreq = 48000000;
+	bd->bi_busfreq = 48000000;
+	bd->bi_baudrate = 9600;
+#endif
+}
+#endif /* RPXLITE || RPXCLASSIC */
+
+#ifdef CONFIG_BSEIP
+/* 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
+embed_config(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 = 48000000;
+	bd->bi_busfreq = 48000000;
+}
+#endif /* BSEIP */
+
+#ifdef CONFIG_FADS
+/* Build a board information structure for the FADS.
+ */
+void
+embed_config(bd_t *bd)
+{
+	u_char	*cp;
+	int	i;
+
+	/* Just fill in some known values.
+	 */
+	bd->bi_baudrate = 9600;
+
+	/* Use default enet.
+	*/
+	cp = (u_char *)def_enet_addr;
+	for (i=0; i<6; i++) {
+		bd->bi_enetaddr[i] = *cp++;
+	}
+
+	bd->bi_memstart = 0;
+	bd->bi_memsize = (8 * 1024 * 1024);
+	bd->bi_intfreq = 40000000;
+	bd->bi_busfreq = 40000000;
+}
+#endif /* FADS */
+
+#ifdef CONFIG_8260
+/* Compute 8260 clock values if the rom doesn't provide them.
+ * We can't compute the internal core frequency (I don't know how to
+ * do that).
+ */
+static void
+clk_8260(bd_t *bd)
+{
+	uint	scmr, vco_out, clkin;
+	uint	plldf, pllmf, busdf, brgdf, cpmdf;
+	volatile immap_t	*ip;
+
+	ip = (immap_t *)IMAP_ADDR;
+	scmr = ip->im_clkrst.car_scmr;
+
+	/* The clkin is always bus frequency.
+	*/
+	clkin = bd->bi_busfreq;
+
+	/* Collect the bits from the scmr.
+	*/
+	plldf = (scmr >> 12) & 1;
+	pllmf = scmr & 0xfff;
+	cpmdf = (scmr >> 16) & 0x0f;
+	busdf = (scmr >> 20) & 0x0f;
+
+	/* This is arithmetic from the 8260 manual.
+	*/
+	vco_out = clkin / (plldf + 1);
+	vco_out *= 2 * (pllmf + 1);
+	bd->bi_vco = vco_out;		/* Save for later */
+
+	bd->bi_cpmfreq = vco_out / 2;	/* CPM Freq, in MHz */
+
+	/* Set Baud rate divisor.  The power up default is divide by 16,
+	 * but we set it again here in case it was changed.
+	 */
+	ip->im_clkrst.car_sccr = 1;	/* DIV 16 BRG */
+	bd->bi_brgfreq = vco_out / 16;
+}
+#endif
+
+#ifdef CONFIG_EST8260
+void
+embed_config(bd_t **bdp)
+{
+	u_char	*cp;
+	int	i;
+	bd_t	*bd;
+
+	bd = *bdp;
+#if 0
+	/* This is actually provided by my boot rom.  I have it
+	 * here for those people that may load the kernel with
+	 * a JTAG/COP tool and not the rom monitor.
+	 */
+	bd->bi_baudrate = 115200;
+	bd->bi_intfreq = 200000000;
+	bd->bi_busfreq = 66666666;
+	bd->bi_cpmfreq = 66666666;
+	bd->bi_brgfreq = 33333333;
+	bd->bi_memsize = 16 * 1024 * 1024;
+#else
+	/* The boot rom passes these to us in MHz.  Linux now expects
+	 * them to be in Hz.
+	 */
+	bd->bi_intfreq *= 1000000;
+	bd->bi_busfreq *= 1000000;
+	bd->bi_cpmfreq *= 1000000;
+	bd->bi_brgfreq *= 1000000;
+#endif
+
+	cp = (u_char *)def_enet_addr;
+	for (i=0; i<6; i++) {
+		bd->bi_enetaddr[i] = *cp++;
+	}
+}
+#endif /* EST8260 */
+
+#ifdef CONFIG_SBS8260
+/* We have to fill in everything.
+*/
+static	bd_t	bdinfo;
+
+void
+embed_config(bd_t **bdp)
+{
+	u_char	*cp;
+	int	i;
+	bd_t	*bd;
+
+	/* This should provided by the boot rom.
+	 */
+	bd = &bdinfo;
+	*bdp = bd;
+	bd->bi_baudrate = 9600;
+	bd->bi_memsize = 64 * 1024 * 1024;
+
+	/* Set all of the clocks.  We have to know the speed of the
+	 * external clock.  The development board had 66 MHz.
+	 */
+	bd->bi_busfreq = 66666666;
+	clk_8260(bd);
+
+	/* I don't know how to compute this yet.
+	*/
+	bd->bi_intfreq = 133000000;
+
+
+	cp = (u_char *)def_enet_addr;
+	for (i=0; i<6; i++) {
+		bd->bi_enetaddr[i] = *cp++;
+	}
+}
+#endif /* SBS8260 */
+
+#ifdef CONFIG_RPX6
+/* The pointer we are given is for the string of key values.
+ */
+static	bd_t	bdinfo;
+
+void
+embed_config(bd_t **bdp)
+{
+	u_char	*cp, *keyvals;
+	int	i;
+	bd_t	*bd;
+
+	keyvals = (u_char *)*bdp;
+
+	bd = &bdinfo;
+	*bdp = bd;
+
+	/* This is almost identical to the RPX-Lite/Classic functions
+	 * on the 8xx boards.  It would be nice to have a key lookup
+	 * function in a string, but the format of all of the fields
+	 * is slightly different.
+	 */
+	cp = keyvals;
+	for (;;) {
+		if (*cp == 'E') {
+			cp++;
+			if (*cp == 'A') {
+				cp += 2;
+				rpx_eth(bd, cp);
+			}
+		}
+		if (*cp == 'S') {
+			cp++;
+			if (*cp == 'B') {
+				cp += 2;
+				bd->bi_baudrate = rpx_baseten(cp);
+			}
+		}
+		if (*cp == 'D') {
+			cp++;
+			if (*cp == '1') {
+				cp += 2;
+				bd->bi_memsize = rpx_baseten(cp) * 1024 * 1024;
+			}
+		}
+		if (*cp == 'X') {
+			cp++;
+			if (*cp == 'T') {
+				cp += 2;
+				bd->bi_busfreq = rpx_baseten(cp);
+			}
+		}
+		if (*cp == 'N') {
+			cp++;
+			if (*cp == 'V') {
+				cp += 2;
+				bd->bi_nvsize = rpx_baseten(cp) * 1024 * 1024;
+			}
+		}
+
+		/* 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;
+
+	/* The memory size includes both the 60x and local bus DRAM.
+	 * I don't want to use the local bus DRAM for real memory,
+	 * so subtract it out.  It would be nice if they were separate
+	 * keys.
+	 */
+	bd->bi_memsize -= 32 * 1024 * 1024;
+
+	/* Set all of the clocks.  We have to know the speed of the
+	 * external clock.
+	 */
+	clk_8260(bd);
+
+	/* I don't know how to compute this yet.
+	*/
+	bd->bi_intfreq = 200000000;
+}
+#endif /* RPX6 for testing */
+
+#ifdef CONFIG_ADS8260
+/* We have to fill in everything.
+*/
+static	bd_t	bdinfo;
+
+void
+embed_config(bd_t **bdp)
+{
+	u_char	*cp;
+	int	i;
+	bd_t	*bd;
+
+	/* This should provided by the boot rom.
+	 */
+	bd = &bdinfo;
+	*bdp = bd;
+	bd->bi_baudrate = 9600;
+	bd->bi_memsize = 16 * 1024 * 1024;
+
+	/* Set all of the clocks.  We have to know the speed of the
+	 * external clock.  The development board had 66 MHz.
+	 */
+	bd->bi_busfreq = 66666666;
+	clk_8260(bd);
+
+	/* I don't know how to compute this yet.
+	*/
+	bd->bi_intfreq = 200000000;
+
+
+	cp = (u_char *)def_enet_addr;
+	for (i=0; i<6; i++) {
+		bd->bi_enetaddr[i] = *cp++;
+	}
+}
+#endif /* ADS8260 */
+