embed_config.c

ARM 嵌入式 系统 设计与实例开发 实验教材 二源码

/*
 * 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 */