epcs.c

Universal Bootloader which support OMAP2420.

	return (0);
}

int epcs_write (ulong addr, ulong off, ulong cnt)
{
	ulong wrcnt;
	unsigned pgsz;
	unsigned char buf[4];
	struct epcs_devinfo_t *dev = epcs_dev_find ();

	if (!dev)
		return (-1);

	pgsz = (1<<dev->sz_page);
	while (cnt) {
		if (off % pgsz)
			wrcnt = pgsz - (off % pgsz);
		else
			wrcnt = pgsz;
		wrcnt = (wrcnt > cnt) ? cnt : wrcnt;

		buf[0] = EPCS_WRITE_BYTES;
		buf[1] = off >> 16;
		buf[2] = off >> 8;
		buf[3] = off;

		epcs_wr_enable ();
		epcs_cs (1);
		epcs_snd (buf,4);
		epcs_rsnd ((unsigned char *)addr, wrcnt);
		epcs_cs (0);

		/* Wait for write to complete */
		while (epcs_status_rd() & EPCS_STATUS_WIP)
			;

		cnt -= wrcnt;
		off += wrcnt;
		addr += wrcnt;
	}

	return (0);
}

int epcs_verify (ulong addr, ulong off, ulong cnt, ulong *err)
{
	ulong rdcnt;
	unsigned char buf[256];
	unsigned char *start,*end;
	int i;

	start = end = (unsigned char *)addr;
	while (cnt) {
		rdcnt = (cnt>sizeof(buf)) ? sizeof(buf) : cnt;
		epcs_read ((ulong)buf, off, rdcnt);
		for (i=0; i<rdcnt; i++) {
			if (*end != buf[i]) {
				*err = end - start;
				return(-1);
			}
			end++;
		}
		cnt -= rdcnt;
		off += rdcnt;
	}
	return (0);
}

static int epcs_sect_erased (int sect, unsigned *offset,
		struct epcs_devinfo_t *dev)
{
	unsigned char buf[128];
	unsigned off, end;
	unsigned sectsz;
	int i;

	sectsz = (1 << dev->sz_sect);
	off = sectsz * sect;
	end = off + sectsz;

	while (off < end) {
		epcs_read ((ulong)buf, off, sizeof(buf));
		for (i=0; i < sizeof(buf); i++) {
			if (buf[i] != 0xff) {
				*offset = off + i;
				return (0);
			}
		}
		off += sizeof(buf);
	}
	return (1);
}


/***********************************************************************
 * Commands
 ***********************************************************************/
static
void do_epcs_info (struct epcs_devinfo_t *dev, int argc, char *argv[])
{
	int i;
	unsigned char stat;
	unsigned tmp;
	int erased;

	/* Basic device info */
	printf ("%s: %d kbytes (%d sectors x %d kbytes,"
		" %d bytes/page)\n",
		dev->name, 1 << (dev->size-10),
		dev->num_sects, 1 << (dev->sz_sect-10),
		1 << dev->sz_page );

	/* Status -- for now protection is all-or-nothing */
	stat = epcs_status_rd();
	printf ("status: 0x%02x (WIP:%d, WEL:%d, PROT:%s)\n",
		stat,
		(stat & EPCS_STATUS_WIP) ? 1 : 0,
	        (stat & EPCS_STATUS_WEL) ? 1 : 0,
		(stat & dev->prot_mask) ? "on" : "off" );

	/* Configuration  */
	tmp = epcs_cfgsz ();
	if (tmp) {
		printf ("config: 0x%06x (%d) bytes\n", tmp, tmp );
	} else {
		printf ("config: unknown\n" );
	}

	/* Sector info */
	for (i=0; i<dev->num_sects; i++) {
		erased = epcs_sect_erased (i, &tmp, dev);
		printf ("     %d: %06x ",
			i, i*(1<<dev->sz_sect) );
		if (erased)
			printf ("erased\n");
		else
			printf ("data @ 0x%06x\n", tmp);
	}

	return;
}

static
void do_epcs_erase (struct epcs_devinfo_t *dev, int argc, char *argv[])
{
	unsigned start,end;

	if ((argc < 3) || (argc > 4)) {
		printf ("USAGE: epcs erase sect [end]\n");
		return;
	}
	if ((epcs_status_rd() & dev->prot_mask) != 0) {
		printf ( "epcs: device protected.\n");
		return;
	}

	start = simple_strtoul (argv[2], NULL, 10);
	if (argc > 3)
		end = simple_strtoul (argv[3], NULL, 10);
	else
		end = start;
	if ((start >= dev->num_sects) || (start > end)) {
		printf ("epcs: invalid sector range: [%d:%d]\n",
			start, end );
		return;
	}

	epcs_erase (start, end);

	return;
}

static
void do_epcs_protect (struct epcs_devinfo_t *dev, int argc, char *argv[])
{
	unsigned char stat;

	/* For now protection is all-or-nothing to keep things
	 * simple. The protection bits don't map in a linear
	 * fashion ... and we would rather protect the bottom
	 * of the device since it contains the config data and
	 * leave the top unprotected for app use. But unfortunately
	 * protection works from top-to-bottom so it does
	 * really help very much from a software app point-of-view.
	 */
	if (argc < 3) {
		printf ("USAGE: epcs protect on | off\n");
		return;
	}
	if (!dev)
		return;

	/* Protection on/off is just a matter of setting/clearing
	 * all protection bits in the status register.
	 */
	stat = epcs_status_rd ();
	if (strcmp ("on", argv[2]) == 0) {
		stat |= dev->prot_mask;
	} else if (strcmp ("off", argv[2]) == 0 ) {
		stat &= ~dev->prot_mask;
	} else {
		printf ("epcs: unknown protection: %s\n", argv[2]);
		return;
	}
	epcs_status_wr (stat);
	return;
}

static
void do_epcs_read (struct epcs_devinfo_t *dev, int argc, char *argv[])
{
	ulong addr,off,cnt;
	ulong sz;

	if (argc < 5) {
		printf ("USAGE: epcs read addr offset count\n");
		return;
	}

	sz = 1 << dev->size;
	addr = simple_strtoul (argv[2], NULL, 16);
	off  = simple_strtoul (argv[3], NULL, 16);
	cnt  = simple_strtoul (argv[4], NULL, 16);
	if (off > sz) {
		printf ("offset is greater than device size"
			"... aborting.\n");
		return;
	}
	if ((off + cnt) > sz) {
		printf ("request exceeds device size"
			"... truncating.\n");
		cnt = sz - off;
	}
	printf ("epcs: read %08lx <- %06lx (0x%lx bytes)\n",
			addr, off, cnt);
	epcs_read (addr, off, cnt);

	return;
}

static
void do_epcs_write (struct epcs_devinfo_t *dev, int argc, char *argv[])
{
	ulong addr,off,cnt;
	ulong sz;
	ulong err;

	if (argc < 5) {
		printf ("USAGE: epcs write addr offset count\n");
		return;
	}
	if ((epcs_status_rd() & dev->prot_mask) != 0) {
		printf ( "epcs: device protected.\n");
		return;
	}

	sz = 1 << dev->size;
	addr = simple_strtoul (argv[2], NULL, 16);
	off  = simple_strtoul (argv[3], NULL, 16);
	cnt  = simple_strtoul (argv[4], NULL, 16);
	if (off > sz) {
		printf ("offset is greater than device size"
			"... aborting.\n");
		return;
	}
	if ((off + cnt) > sz) {
		printf ("request exceeds device size"
			"... truncating.\n");
		cnt = sz - off;
	}
	printf ("epcs: write %08lx -> %06lx (0x%lx bytes)\n",
			addr, off, cnt);
	epcs_write (addr, off, cnt);
	if (epcs_verify (addr, off, cnt, &err) != 0)
		printf ("epcs: write error at offset %06lx\n", err);

	return;
}

static
void do_epcs_verify (struct epcs_devinfo_t *dev, int argc, char *argv[])
{
	ulong addr,off,cnt;
	ulong sz;
	ulong err;

	if (argc < 5) {
		printf ("USAGE: epcs verify addr offset count\n");
		return;
	}

	sz = 1 << dev->size;
	addr = simple_strtoul (argv[2], NULL, 16);
	off  = simple_strtoul (argv[3], NULL, 16);
	cnt  = simple_strtoul (argv[4], NULL, 16);
	if (off > sz) {
		printf ("offset is greater than device size"
			"... aborting.\n");
		return;
	}
	if ((off + cnt) > sz) {
		printf ("request exceeds device size"
			"... truncating.\n");
		cnt = sz - off;
	}
	printf ("epcs: verify %08lx -> %06lx (0x%lx bytes)\n",
			addr, off, cnt);
	if (epcs_verify (addr, off, cnt, &err) != 0)
		printf ("epcs: verify error at offset %06lx\n", err);

	return;
}

/*-----------------------------------------------------------------------*/
int do_epcs (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
	int len;
	struct epcs_devinfo_t *dev = epcs_dev_find ();

	if (!dev) {
		printf ("epcs: device not found.\n");
		return (-1);
	}

	if (argc < 2) {
		do_epcs_info (dev, argc, argv);
		return (0);
	}

	len = strlen (argv[1]);
	if (strncmp ("info", argv[1], len) == 0) {
		do_epcs_info (dev, argc, argv);
	} else if (strncmp ("erase", argv[1], len) == 0) {
		do_epcs_erase (dev, argc, argv);
	} else if (strncmp ("protect", argv[1], len) == 0) {
		do_epcs_protect (dev, argc, argv);
	} else if (strncmp ("read", argv[1], len) == 0) {
		do_epcs_read (dev, argc, argv);
	} else if (strncmp ("write", argv[1], len) == 0) {
		do_epcs_write (dev, argc, argv);
	} else if (strncmp ("verify", argv[1], len) == 0) {
		do_epcs_verify (dev, argc, argv);
	} else {
		printf ("epcs: unknown operation: %s\n", argv[1]);
	}

	return (0);
}

/*-----------------------------------------------------------------------*/


U_BOOT_CMD( epcs, 5, 0, do_epcs, SHORT_HELP, LONG_HELP );

#endif /* CONFIG_NIOS_EPCS */