Initial revision

1 files changed, 470 insertions, 0 deletions

diff --git a/board/genietv/flash.c b/board/genietv/flash.c
new file mode 100644
index 0000000..2314a53
--- /dev/null
+++ b/board/genietv/flash.c
@@ -0,0 +1,470 @@
+/*
+ * (C) Copyright 2000
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <mpc8xx.h>
+
+flash_info_t	flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips	*/
+
+/*-----------------------------------------------------------------------
+ * Functions
+ */
+static ulong flash_get_size (vu_long *addr, flash_info_t *info);
+static int write_word (flash_info_t *info, ulong dest, ulong data);
+static void flash_get_offsets (ulong base, flash_info_t *info);
+
+/*-----------------------------------------------------------------------
+ */
+
+unsigned long flash_init (void)
+{
+	unsigned long size_b0, size_b1;
+	int i;
+
+	/* Init: no FLASHes known */
+	for (i=0; i < CFG_MAX_FLASH_BANKS; ++i)
+	    flash_info[i].flash_id = FLASH_UNKNOWN;
+
+	/* Detect size */
+	size_b0 = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);
+
+	/* Setup offsets */
+	flash_get_offsets (CFG_FLASH_BASE, &flash_info[0]);
+
+#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
+	/* Monitor protection ON by default */
+	flash_protect(FLAG_PROTECT_SET,
+		      CFG_MONITOR_BASE,
+		      CFG_MONITOR_BASE+CFG_MONITOR_LEN-1,
+		      &flash_info[0]);
+#endif
+
+	size_b1 = 0 ;
+
+	flash_info[1].flash_id = FLASH_UNKNOWN;
+	flash_info[1].sector_count = -1;
+
+	flash_info[0].size = size_b0;
+	flash_info[1].size = size_b1;
+
+	return (size_b0 + size_b1);
+}
+
+/*-----------------------------------------------------------------------
+ * Fix this to support variable sector sizes
+*/
+static void flash_get_offsets (ulong base, flash_info_t *info)
+{
+	int i;
+
+	/* set up sector start address table */
+	if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040) {
+		/* set sector offsets for bottom boot block type	*/
+		for (i = 0; i < info->sector_count; i++)
+			info->start[i] = base + (i * 0x00010000);
+	}
+}
+
+/*-----------------------------------------------------------------------
+ */
+void flash_print_info  (flash_info_t *info)
+{
+	int i;
+
+	if (info->flash_id == FLASH_UNKNOWN)
+	{
+		puts ("missing or unknown FLASH type\n");
+		return;
+	}
+
+	switch (info->flash_id & FLASH_VENDMASK)
+	{
+		case FLASH_MAN_AMD:	printf ("AMD ");		break;
+		case FLASH_MAN_FUJ:	printf ("FUJITSU ");		break;
+		case FLASH_MAN_BM:	printf ("BRIGHT MICRO ");	break;
+		default:		printf ("Unknown Vendor ");	break;
+	}
+
+	switch (info->flash_id & FLASH_TYPEMASK)
+	{
+		case FLASH_AM040:	printf ("29F040 or 29LV040 (4 Mbit, uniform sectors)\n");
+			break;
+		case FLASH_AM400B:	printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
+					break;
+		case FLASH_AM400T:	printf ("AM29LV400T (4 Mbit, top boot sector)\n");
+					break;
+		case FLASH_AM800B:	printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
+					break;
+		case FLASH_AM800T:	printf ("AM29LV800T (8 Mbit, top boot sector)\n");
+					break;
+		case FLASH_AM160B:	printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
+					break;
+		case FLASH_AM160T:	printf ("AM29LV160T (16 Mbit, top boot sector)\n");
+					break;
+		case FLASH_AM320B:	printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
+					break;
+		case FLASH_AM320T:	printf ("AM29LV320T (32 Mbit, top boot sector)\n");
+					break;
+		default:		printf ("Unknown Chip Type\n");
+					break;
+	}
+
+	if (info->size >> 20) {
+	    printf ("  Size: %ld MB in %d Sectors\n",
+	    	info->size >> 20,
+		info->sector_count);
+	} else {
+	    printf ("  Size: %ld KB in %d Sectors\n",
+	    	info->size >> 10,
+		info->sector_count);
+	}
+
+	puts ("  Sector Start Addresses:");
+
+	for (i=0; i<info->sector_count; ++i)
+	{
+		if ((i % 5) == 0)
+		{
+			puts ("\n   ");
+		}
+
+		printf (" %08lX%s",
+			info->start[i],
+			info->protect[i] ? " (RO)" : "     ");
+	}
+
+	putc ('\n');
+	return;
+}
+/*-----------------------------------------------------------------------
+ */
+
+/*
+ * The following code cannot be run from FLASH!
+ */
+
+static ulong flash_get_size (vu_long *addr, flash_info_t *info)
+{
+	short i;
+	volatile unsigned char *caddr;
+	char value;
+
+	caddr = (volatile unsigned char *)addr ;
+
+	/* Write auto select command: read Manufacturer ID */
+
+#if 0
+	printf("Base address is: %08x\n", caddr);
+#endif
+
+	caddr[0x0555] = 0xAA;
+	caddr[0x02AA] = 0x55;
+	caddr[0x0555] = 0x90;
+
+	value = caddr[0];
+
+#if 0
+	printf("Manufact ID: %02x\n", value);
+#endif
+	switch (value)
+	{
+		case 0x01:
+		case AMD_MANUFACT:
+			info->flash_id = FLASH_MAN_AMD;
+		break;
+
+		case FUJ_MANUFACT:
+			info->flash_id = FLASH_MAN_FUJ;
+		break;
+
+		default:
+			info->flash_id = FLASH_UNKNOWN;
+			info->sector_count = 0;
+			info->size = 0;
+			break;
+	}
+
+	value = caddr[1];			/* device ID		*/
+#if 0
+	printf("Device ID: %02x\n", value);
+#endif
+	switch (value)
+	{
+		case AMD_ID_LV040B:
+			info->flash_id += FLASH_AM040;
+			info->sector_count = 8;
+			info->size = 0x00080000;
+			break;				/* => 512Kb 		*/
+
+		default:
+			info->flash_id = FLASH_UNKNOWN;
+			return (0);			/* => no or unknown flash */
+
+	}
+
+	flash_get_offsets ((ulong)addr, &flash_info[0]);
+
+	/* check for protected sectors */
+	for (i = 0; i < info->sector_count; i++)
+	{
+		/* read sector protection at sector address, (A7 .. A0) = 0x02 */
+		/* D0 = 1 if protected */
+		caddr = (volatile unsigned char *)(info->start[i]);
+		info->protect[i] = caddr[2] & 1;
+	}
+
+	/*
+	 * Prevent writes to uninitialized FLASH.
+	 */
+	if (info->flash_id != FLASH_UNKNOWN)
+	{
+		caddr = (volatile unsigned char *)info->start[0];
+		*caddr = 0xF0;	/* reset bank */
+	}
+
+	return (info->size);
+}
+
+
+/*-----------------------------------------------------------------------
+ */
+
+int	flash_erase (flash_info_t *info, int s_first, int s_last)
+{
+	volatile unsigned char *addr = (volatile unsigned char *)(info->start[0]);
+	int flag, prot, sect, l_sect;
+	ulong start, now, last;
+
+	if ((s_first < 0) || (s_first > s_last)) {
+		if (info->flash_id == FLASH_UNKNOWN) {
+			printf ("- missing\n");
+		} else {
+			printf ("- no sectors to erase\n");
+		}
+		return 1;
+	}
+
+	if ((info->flash_id == FLASH_UNKNOWN) ||
+	    (info->flash_id > FLASH_AMD_COMP)) {
+		printf ("Can't erase unknown flash type - aborted\n");
+		return 1;
+	}
+
+	prot = 0;
+	for (sect=s_first; sect<=s_last; ++sect) {
+		if (info->protect[sect]) {
+			prot++;
+		}
+	}
+
+	if (prot) {
+		printf ("- Warning: %d protected sectors will not be erased!\n",
+			prot);
+	} else {
+		printf ("\n");
+	}
+
+	l_sect = -1;
+
+	/* Disable interrupts which might cause a timeout here */
+	flag = disable_interrupts();
+
+	addr[0x0555] = 0xAA;
+	addr[0x02AA] = 0x55;
+	addr[0x0555] = 0x80;
+	addr[0x0555] = 0xAA;
+	addr[0x02AA] = 0x55;
+
+	/* Start erase on unprotected sectors */
+	for (sect = s_first; sect<=s_last; sect++) {
+		if (info->protect[sect] == 0) {	/* not protected */
+			addr = (volatile unsigned char *)(info->start[sect]);
+			addr[0] = 0x30;
+			l_sect = sect;
+		}
+	}
+
+	/* re-enable interrupts if necessary */
+	if (flag)
+		enable_interrupts();
+
+	/* wait at least 80us - let's wait 1 ms */
+	udelay (1000);
+
+	/*
+	 * We wait for the last triggered sector
+	 */
+	if (l_sect < 0)
+		goto DONE;
+
+	start = get_timer (0);
+	last  = start;
+	addr = (volatile unsigned char *)(info->start[l_sect]);
+
+	while ((addr[0] & 0xFF) != 0xFF)
+	{
+		if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
+			printf ("Timeout\n");
+			return 1;
+		}
+		/* show that we're waiting */
+		if ((now - last) > 1000) {	/* every second */
+			putc ('.');
+			last = now;
+		}
+	}
+
+DONE:
+	/* reset to read mode */
+	addr = (volatile unsigned char *)info->start[0];
+
+	addr[0] = 0xF0;	/* reset bank */
+
+	printf (" done\n");
+	return 0;
+}
+
+/*-----------------------------------------------------------------------
+ * Copy memory to flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ */
+
+int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
+{
+	ulong cp, wp, data;
+	int i, l, rc;
+
+	wp = (addr & ~3);	/* get lower word aligned address */
+
+	/*
+	 * handle unaligned start bytes
+	 */
+	if ((l = addr - wp) != 0) {
+		data = 0;
+		for (i=0, cp=wp; i<l; ++i, ++cp) {
+			data = (data << 8) | (*(uchar *)cp);
+		}
+		for (; i<4 && cnt>0; ++i) {
+			data = (data << 8) | *src++;
+			--cnt;
+			++cp;
+		}
+		for (; cnt==0 && i<4; ++i, ++cp) {
+			data = (data << 8) | (*(uchar *)cp);
+		}
+
+		if ((rc = write_word(info, wp, data)) != 0) {
+			return (rc);
+		}
+		wp += 4;
+	}
+
+	/*
+	 * handle word aligned part
+	 */
+	while (cnt >= 4) {
+		data = 0;
+		for (i=0; i<4; ++i) {
+			data = (data << 8) | *src++;
+		}
+		if ((rc = write_word(info, wp, data)) != 0) {
+			return (rc);
+		}
+		wp  += 4;
+		cnt -= 4;
+	}
+
+	if (cnt == 0) {
+		return (0);
+	}
+
+	/*
+	 * handle unaligned tail bytes
+	 */
+	data = 0;
+	for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
+		data = (data << 8) | *src++;
+		--cnt;
+	}
+	for (; i<4; ++i, ++cp) {
+		data = (data << 8) | (*(uchar *)cp);
+	}
+
+	return (write_word(info, wp, data));
+}
+
+/*-----------------------------------------------------------------------
+ * Write a word to Flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ */
+static int write_word (flash_info_t *info, ulong dest, ulong data)
+{
+	volatile unsigned char *addr = (volatile unsigned char*)(info->start[0]),
+				*cdest,*cdata;
+	ulong start;
+	int flag, count = 4 ;
+
+	cdest = (volatile unsigned char *)dest ;
+	cdata = (volatile unsigned char *)&data ;
+
+	/* Check if Flash is (sufficiently) erased */
+	if ((*((vu_long *)dest) & data) != data) {
+		return (2);
+	}
+
+	while(count--)
+	{
+	    /* Disable interrupts which might cause a timeout here */
+	    flag = disable_interrupts();
+
+	    addr[0x0555] = 0xAA;
+	    addr[0x02AA] = 0x55;
+	    addr[0x0555] = 0xA0;
+
+	    *cdest = *cdata;
+
+	    /* re-enable interrupts if necessary */
+	    if (flag)
+	    	enable_interrupts();
+
+	    /* data polling for D7 */
+	    start = get_timer (0);
+	    while ((*cdest ^ *cdata) & 0x80)
+	    {
+		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
+			return (1);
+		}
+	    }
+
+	    cdata++ ;
+	    cdest++ ;
+	}
+	return (0);
+}
+
+/*-----------------------------------------------------------------------
+ */