Initial revision

1 files changed, 697 insertions, 0 deletions

diff --git a/board/flagadm/flash.c b/board/flagadm/flash.c
new file mode 100644
index 0000000..fc5d963
--- /dev/null
+++ b/board/flagadm/flash.c
@@ -0,0 +1,697 @@
+/*
+ * (C) Copyright 2001
+ * 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>
+#include <flash.h>
+
+flash_info_t	flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips	*/
+
+/*-----------------------------------------------------------------------
+ * Functions
+ */
+ulong flash_recognize (vu_long *base);
+int write_word (flash_info_t *info, ulong dest, ulong data);
+void flash_get_geometry (vu_long *base, flash_info_t *info);
+void flash_unprotect(flash_info_t *info);
+int _flash_real_protect(flash_info_t *info, long idx, int on);
+
+
+unsigned long flash_init (void)
+{
+	volatile immap_t	*immap  = (immap_t *)CFG_IMMR;
+	volatile memctl8xx_t	*memctl = &immap->im_memctl;
+	int i;
+	int rec;
+
+	for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
+		flash_info[i].flash_id = FLASH_UNKNOWN;
+	}
+
+	*((vu_short*)CFG_FLASH_BASE) = 0xffff;
+
+	flash_get_geometry ((vu_long*)CFG_FLASH_BASE, &flash_info[0]);
+
+	/* Remap FLASH according to real size */
+	memctl->memc_or0 = CFG_OR_TIMING_FLASH | (-flash_info[0].size & 0xFFFF8000);
+	memctl->memc_br0 = (CFG_FLASH_BASE & BR_BA_MSK) |
+		(memctl->memc_br0 & ~(BR_BA_MSK));
+
+	rec = flash_recognize((vu_long*)CFG_FLASH_BASE);
+
+	if (rec == FLASH_UNKNOWN) {
+		printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
+				flash_info[0].size, flash_info[0].size<<20);
+	}
+
+#if CFG_FLASH_PROTECTION
+	/*Unprotect all the flash memory*/
+	flash_unprotect(&flash_info[0]);
+#endif
+
+	*((vu_short*)CFG_FLASH_BASE) = 0xffff;
+
+	return (flash_info[0].size);
+
+#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
+
+#ifdef	CFG_ENV_IS_IN_FLASH
+	/* ENV protection ON by default */
+	flash_protect(FLAG_PROTECT_SET,
+		      CFG_ENV_OFFSET,
+		      CFG_ENV_OFFSET+CFG_ENV_SIZE-1,
+		      &flash_info[0]);
+#endif
+	return (flash_info[0].size);
+}
+
+
+int flash_get_protect_status(flash_info_t * info, long idx)
+{
+	vu_short * base;
+	ushort res;
+
+#ifdef DEBUG
+	printf("\n Attempting to set protection info with %d sectors\n", info->sector_count);
+#endif
+
+
+	base = (vu_short*)info->start[idx];
+
+	*(base) = 0xffff;
+
+	*(base + 0x55) = 0x0098;
+	res = base[0x2];
+
+	*(base) = 0xffff;
+
+	if(res != 0)
+		res = 1;
+	else
+		res = 0;
+
+	return res;
+}
+
+void flash_get_geometry (vu_long *base, flash_info_t *info)
+{
+	int i,j;
+	ulong ner = 0;
+	vu_short * sb  = (vu_short*)base;
+	ulong offset = (ulong)base;
+
+	/* Read Device geometry */
+
+	*sb = 0xffff;
+
+	*sb = 0x0090;
+
+	info->flash_id = ((ulong)base[0x0]);
+#ifdef DEBUG
+	printf("Id is %x\n", (uint)(ulong)info->flash_id);
+#endif
+
+	*sb = 0xffff;
+
+	*(sb+0x55) = 0x0098;
+
+	info->size = 1 << (sb[0x27]); /* Read flash size */
+
+#ifdef DEBUG
+	printf("Size is %x\n", (uint)(ulong)info->size);
+#endif
+
+	*sb = 0xffff;
+
+	*(sb + 0x55) = 0x0098;
+	ner = sb[0x2c] ; /*Number of erase regions*/
+
+#ifdef DEBUG
+	printf("Number of erase regions %x\n", (uint)ner);
+#endif
+
+	info->sector_count = 0;
+
+	for(i = 0; i < ner; i++)
+	{
+		uint s;
+		uint count;
+		uint t1,t2,t3,t4;
+
+		*sb = 0xffff;
+
+		*(sb + 0x55) = 0x0098;
+
+		t1 = sb[0x2d + i*4];
+		t2 = sb[0x2e + i*4];
+		t3 = sb[0x2f + i*4];
+		t4 = sb[0x30 + i*4];
+
+		count = ((t1 & 0x00ff) | (((t2 & 0x00ff) << 8) & 0xff00) )+ 1; /*sector count*/
+		s = ((t3 & 0x00ff) | (((t4 & 0x00ff) << 8) & 0xff00)) * 256;; /*Sector size*/
+
+#ifdef DEBUG
+		printf("count and size %x, %x\n", count, s);
+		printf("sector count for erase region %d is %d\n", i, count);
+#endif
+		for(j = 0; j < count; j++)
+		{
+#ifdef DEBUG
+			printf("%x, ", (uint)offset);
+#endif
+			info->start[ info->sector_count + j] = offset;
+			offset += s;
+		}
+		info->sector_count += count;
+	}
+
+	if ((offset - (ulong)base) != info->size)
+		printf("WARNING reported size %x does not match to calculted size %x.\n"
+				, (uint)info->size, (uint)(offset - (ulong)base) );
+
+	/* Next check if there are any sectors protected.*/
+
+	for(i = 0; i < info->sector_count; i++)
+		info->protect[i] = flash_get_protect_status(info, i);
+
+	*sb = 0xffff;
+}
+
+/*-----------------------------------------------------------------------
+ */
+void flash_print_info  (flash_info_t *info)
+{
+	int i;
+
+	if (info->flash_id == FLASH_UNKNOWN) {
+		printf ("missing or unknown FLASH type\n");
+		return ;
+	}
+
+	switch (info->flash_id & FLASH_VENDMASK) {
+	case INTEL_MANUFACT & FLASH_VENDMASK:
+		printf ("Intel ");
+		break;
+	default:
+		printf ("Unknown Vendor ");
+		break;
+	}
+
+	switch (info->flash_id & FLASH_TYPEMASK) {
+	case INTEL_ID_28F320C3B & FLASH_TYPEMASK:
+		printf ("28F320RC3(4 MB)\n");
+		break;
+	case INTEL_ID_28F320J3A:
+		printf("28F320J3A (4 MB)\n");
+		break;
+	default:
+		printf ("Unknown Chip Type\n");
+			break;
+	}
+
+	printf ("  Size: %ld MB in %d Sectors\n",
+		info->size >> 20, info->sector_count);
+
+	printf ("  Sector Start Addresses:");
+	for (i=0; i<info->sector_count; ++i) {
+		if ((i % 4) == 0)
+			printf ("\n   ");
+		printf ("  %02d %08lX%s",
+			i, info->start[i],
+			info->protect[i]!=0 ? " (RO)" : "     "
+		);
+	}
+	printf ("\n");
+	return ;
+}
+
+ulong flash_recognize (vu_long *base)
+{
+	ulong id;
+	ulong res = FLASH_UNKNOWN;
+	vu_short * sb = (vu_short*)base;
+
+	*sb = 0xffff;
+
+	*sb = 0x0090;
+	id = base[0];
+
+	switch (id & 0x00FF0000)
+	{
+		case (MT_MANUFACT & 0x00FF0000):	/* MT or => Intel */
+		case (INTEL_ALT_MANU & 0x00FF0000):
+		res = FLASH_MAN_INTEL;
+		break;
+	default:
+		res = FLASH_UNKNOWN;
+	}
+
+	*sb = 0xffff;
+
+	return res;
+}
+
+/*-----------------------------------------------------------------------*/
+#define INTEL_FLASH_STATUS_BLS	0x02
+#define INTEL_FLASH_STATUS_PSS	0x04
+#define INTEL_FLASH_STATUS_VPPS	0x08
+#define INTEL_FLASH_STATUS_PS	0x10
+#define INTEL_FLASH_STATUS_ES	0x20
+#define INTEL_FLASH_STATUS_ESS	0x40
+#define INTEL_FLASH_STATUS_WSMS	0x80
+
+int	flash_decode_status_bits(char status)
+{
+	int err = 0;
+
+	if(!(status & INTEL_FLASH_STATUS_WSMS)) {
+		printf("Busy\n");
+		err = -1;
+	}
+
+	if(status & INTEL_FLASH_STATUS_ESS) {
+		printf("Erase suspended\n");
+		err = -1;
+	}
+
+	if(status & INTEL_FLASH_STATUS_ES) {
+		printf("Error in block erase\n");
+		err = -1;
+	}
+
+	if(status & INTEL_FLASH_STATUS_PS) {
+		printf("Error in programming\n");
+		err = -1;
+	}
+
+	if(status & INTEL_FLASH_STATUS_VPPS) {
+		printf("Vpp low, operation aborted\n");
+		err = -1;
+	}
+
+	if(status & INTEL_FLASH_STATUS_PSS) {
+		printf("Program is suspended\n");
+		err = -1;
+	}
+
+	if(status & INTEL_FLASH_STATUS_BLS) {
+		printf("Attempting to program/erase a locked sector\n");
+		err = -1;
+	}
+
+	if((status & INTEL_FLASH_STATUS_PS) &&
+	   (status & INTEL_FLASH_STATUS_ES) &&
+	   (status & INTEL_FLASH_STATUS_ESS)) {
+		printf("A command sequence error\n");
+		return -1;
+	}
+
+	return err;
+}
+
+/*-----------------------------------------------------------------------
+ */
+
+int	flash_erase (flash_info_t *info, int s_first, int s_last)
+{
+	vu_short *addr;
+	int flag, prot, sect;
+	ulong start, now;
+	int rcode = 0;
+
+	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_VENDMASK) != (INTEL_MANUFACT & FLASH_VENDMASK)) {
+		printf ("Can't erase unknown flash type %08lx - aborted\n",
+			info->flash_id);
+		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");
+	}
+
+	start = get_timer (0);
+
+	/* Start erase on unprotected sectors */
+	for (sect = s_first; sect<=s_last; sect++) {
+		char tmp;
+
+		if (info->protect[sect] == 0) {	/* not protected */
+			addr = (vu_short *)(info->start[sect]);
+
+			/* Disable interrupts which might cause a timeout here */
+			flag = disable_interrupts();
+
+			/* Single Block Erase Command */
+			*addr = 0x0020;
+			/* Confirm */
+			*addr = 0x00D0;
+			/* Resume Command, as per errata update */
+			*addr = 0x00D0;
+
+			/* re-enable interrupts if necessary */
+			if (flag)
+				enable_interrupts();
+
+			*addr = 0x70; /*Read status register command*/
+			tmp = (short)*addr & 0x00FF; /* Read the status */
+			while (!(tmp & INTEL_FLASH_STATUS_WSMS)) {
+				if ((now=get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
+					*addr = 0x0050; /* Reset the status register */
+					*addr = 0xffff;
+					printf ("Timeout\n");
+					return 1;
+				}
+				/* show that we're waiting */
+				if ((now - start) > 1000) {	/* every second */
+					putc ('.');
+				}
+				udelay(100000); /* 100 ms */
+				*addr = 0x0070; /*Read status register command*/
+				tmp = (short)*addr & 0x00FF; /* Read status */
+				start = get_timer(0);
+			}
+			if( tmp & INTEL_FLASH_STATUS_ES )
+				flash_decode_status_bits(tmp);
+
+			*addr = 0x0050; /* Reset the status register */
+			*addr = 0xffff; /* Reset to read mode */
+		}
+	}
+
+
+	printf (" done\n");
+	return rcode;
+}
+
+void flash_unprotect (flash_info_t *info)
+{
+	/*We can only unprotect the whole flash at once*/
+	/*Therefore we must prevent the _flash_real_protect()*/
+	/*from re-protecting sectors, that ware protected before */
+	/*we called flash_real_protect();*/
+
+	int i;
+
+	for(i = 0; i < info->sector_count; i++)
+		info->protect[i] = 0;
+
+#ifdef CFG_FLASH_PROTECTION
+		_flash_real_protect(info, 0, 0);
+#endif
+}
+
+/*-----------------------------------------------------------------------
+ * 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
+ */
+int write_word (flash_info_t *info, ulong dest, ulong da)
+{
+	vu_short *addr = (vu_short *)dest;
+	ulong start;
+	char csr;
+	int flag;
+	ushort * d = (ushort*)&da;
+	int i;
+
+	/* Check if Flash is (sufficiently) erased */
+	if (((*addr & d[0]) != d[0]) || ((*(addr+1) & d[1]) != d[1])) {
+		return (2);
+	}
+	/* Disable interrupts which might cause a timeout here */
+	flag = disable_interrupts();
+
+	for(i = 0; i < 2; i++)
+	{
+		/* Write Command */
+		*addr = 0x0010;
+
+		/* Write Data */
+		*addr = d[i];
+
+		/* re-enable interrupts if necessary */
+		if (flag)
+			enable_interrupts();
+
+		/* data polling for D7 */
+		start = get_timer (0);
+		flag  = 0;
+		*addr = 0x0070; /*Read statusregister command */
+		while (((csr = *addr) & INTEL_FLASH_STATUS_WSMS)!=INTEL_FLASH_STATUS_WSMS) {
+			if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
+				flag = 1;
+				break;
+			}
+			*addr = 0x0070; /*Read statusregister command */
+		}
+		if (csr & INTEL_FLASH_STATUS_PSS) {
+			printf ("CSR indicates write error (%0x) at %08lx\n",
+					csr, (ulong)addr);
+			flag = 1;
+		}
+
+		/* Clear Status Registers Command */
+		*addr = 0x0050;
+		/* Reset to read array mode */
+		*addr = 0xffff;
+		addr++;
+	}
+
+	return (flag);
+}
+
+int flash_real_protect(flash_info_t *info, long offset, int prot)
+{
+	int i, idx;
+
+	for(idx = 0; idx < info->sector_count; idx++)
+		if(info->start[idx] == offset)
+			break;
+
+	if(idx==info->sector_count)
+		return -1;
+
+	if(prot == 0) {
+		/* Unprotect one sector, which means unprotect all flash
+		 * and reprotect the other protected sectors.
+		 */
+		_flash_real_protect(info, 0, 0); /* Unprotects the whole flash*/
+		info->protect[idx] = 0;
+
+		for(i = 0; i < info->sector_count; i++)
+			if(info->protect[i])
+				_flash_real_protect(info, i, 1);
+		}
+	else {
+		/* We can protect individual sectors */
+		_flash_real_protect(info, idx, 1);
+	}
+
+	for( i = 0; i < info->sector_count; i++)
+		info->protect[i] = flash_get_protect_status(info, i);
+
+	return 0;
+}
+
+int _flash_real_protect(flash_info_t *info, long idx, int prot)
+{
+	vu_short *addr;
+	int flag;
+	ushort cmd;
+	ushort tmp;
+	ulong now, start;
+
+	if ((info->flash_id & FLASH_VENDMASK) != (INTEL_MANUFACT & FLASH_VENDMASK)) {
+		printf ("Can't change protection for unknown flash type %08lx - aborted\n",
+			info->flash_id);
+		return -1;
+	}
+
+	if(prot == 0) {
+		/*Unlock the sector*/
+		cmd = 0x00D0;
+	}
+	else {
+		/*Lock the sector*/
+		cmd = 0x0001;
+	}
+
+	addr = (vu_short *)(info->start[idx]);
+
+	/* If chip is busy, wait for it */
+	start = get_timer(0);
+	*addr = 0x0070; /*Read status register command*/
+	tmp = ((ushort)(*addr))&0x00ff; /*Read the status*/
+	while(!(tmp & INTEL_FLASH_STATUS_WSMS)) {
+		/*Write State Machine Busy*/
+		/*Wait untill done or timeout.*/
+		if ((now=get_timer(start)) > CFG_FLASH_WRITE_TOUT) {
+			*addr = 0x0050; /* Reset the status register */
+			*addr = 0xffff; /* Reset the chip */
+			printf ("TTimeout\n");
+			return 1;
+		}
+		*addr = 0x0070;
+		tmp = ((ushort)(*addr))&0x00ff; /*Read the status*/
+		start = get_timer(0);
+	}
+
+	/* Disable interrupts which might cause a timeout here */
+	flag = disable_interrupts();
+
+	/* Unlock block*/
+	*addr = 0x0060;
+
+	*addr = cmd;
+
+	/* re-enable interrupts if necessary */
+	if (flag)
+		enable_interrupts();
+
+	start = get_timer(0);
+	*addr = 0x0070; /*Read status register command*/
+	tmp = ((ushort)(*addr)) & 0x00FF; /* Read the status */
+	while (!(tmp & INTEL_FLASH_STATUS_WSMS)) {
+		/* Write State Machine Busy */
+		if ((now=get_timer(start)) > CFG_FLASH_WRITE_TOUT) {
+			*addr = 0x0050; /* Reset the status register */
+			*addr = 0xffff;
+			printf ("Timeout\n");
+			return 1;
+		}
+		/* show that we're waiting */
+		if ((now - start) > 1000) {	/* every second */
+			putc ('.');
+		}
+		udelay(100000); /* 100 ms */
+		*addr = 0x70; /*Read status register command*/
+		tmp = (short)*addr & 0x00FF; /* Read status */
+		start = get_timer(0);
+	}
+	if( tmp & INTEL_FLASH_STATUS_PS )
+		flash_decode_status_bits(tmp);
+
+	*addr =0x0050; /*Clear status register*/
+
+	/* reset to read mode */
+	*addr = 0xffff;
+
+	return 0;
+}