flash.c 9.71 KB
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/*
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 * (C) Copyright 2001
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 * Kyle Harris, Nexus Technologies, Inc. kharris@nexus-tech.net
 *
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 * (C) Copyright 2001
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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 *
 * 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>
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#include <linux/byteorder/swab.h>
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flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];	/* info for FLASH chips    */
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/* Board support for 1 or 2 flash devices */
#define FLASH_PORT_WIDTH32
#undef FLASH_PORT_WIDTH16

#ifdef FLASH_PORT_WIDTH16
#define FLASH_PORT_WIDTH		ushort
#define FLASH_PORT_WIDTHV		vu_short
#define SWAP(x)               __swab16(x)
#else
#define FLASH_PORT_WIDTH		ulong
#define FLASH_PORT_WIDTHV		vu_long
#define SWAP(x)               __swab32(x)
#endif

#define FPW	   FLASH_PORT_WIDTH
#define FPWV   FLASH_PORT_WIDTHV

#define mb() __asm__ __volatile__ ("" : : : "memory")
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/*-----------------------------------------------------------------------
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 * Functions
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 */
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static ulong flash_get_size (FPW *addr, flash_info_t *info);
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static int write_data (flash_info_t *info, ulong dest, FPW data);
static void flash_get_offsets (ulong base, flash_info_t *info);
void inline spin_wheel (void);
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/*-----------------------------------------------------------------------
 */

unsigned long flash_init (void)
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{
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	int i;
	ulong size = 0;

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	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
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		switch (i) {
		case 0:
			flash_get_size ((FPW *) PHYS_FLASH_1, &flash_info[i]);
			flash_get_offsets (PHYS_FLASH_1, &flash_info[i]);
			break;
		case 1:
			flash_get_size ((FPW *) PHYS_FLASH_2, &flash_info[i]);
			flash_get_offsets (PHYS_FLASH_2, &flash_info[i]);
			break;
		default:
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			panic ("configured too many flash banks!\n");
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			break;
		}
		size += flash_info[i].size;
	}

	/* Protect monitor and environment sectors
	 */
	flash_protect ( FLAG_PROTECT_SET,
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			CONFIG_SYS_FLASH_BASE,
			CONFIG_SYS_FLASH_BASE + monitor_flash_len - 1,
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			&flash_info[0] );

	flash_protect ( FLAG_PROTECT_SET,
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			CONFIG_ENV_ADDR,
			CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1, &flash_info[0] );
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	return size;
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}

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/*-----------------------------------------------------------------------
 */
static void flash_get_offsets (ulong base, flash_info_t *info)
{
	int i;

	if (info->flash_id == FLASH_UNKNOWN) {
		return;
	}

	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL) {
		for (i = 0; i < info->sector_count; i++) {
			info->start[i] = base + (i * PHYS_FLASH_SECT_SIZE);
			info->protect[i] = 0;
		}
	}
}

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/*-----------------------------------------------------------------------
 */
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void flash_print_info (flash_info_t *info)
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{
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	int i;
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	if (info->flash_id == FLASH_UNKNOWN) {
		printf ("missing or unknown FLASH type\n");
		return;
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	}
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	switch (info->flash_id & FLASH_VENDMASK) {
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	case FLASH_MAN_INTEL:
		printf ("INTEL ");
		break;
	default:
		printf ("Unknown Vendor ");
		break;
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	}

	switch (info->flash_id & FLASH_TYPEMASK) {
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	case FLASH_28F128J3A:
		printf ("28F128J3A\n");
		break;
	default:
		printf ("Unknown Chip Type\n");
		break;
	}
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	printf ("  Size: %ld MB in %d Sectors\n",
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			info->size >> 20, info->sector_count);
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	printf ("  Sector Start Addresses:");
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	for (i = 0; i < info->sector_count; ++i) {
		if ((i % 5) == 0)
			printf ("\n   ");
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		printf (" %08lX%s",
			info->start[i],
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			info->protect[i] ? " (RO)" : "     ");
	}
	printf ("\n");
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	return;
}

/*
 * The following code cannot be run from FLASH!
 */
static ulong flash_get_size (FPW *addr, flash_info_t *info)
{
	volatile FPW value;

	/* Write auto select command: read Manufacturer ID */
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	addr[0x5555] = (FPW) 0x00AA00AA;
	addr[0x2AAA] = (FPW) 0x00550055;
	addr[0x5555] = (FPW) 0x00900090;
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	mb ();
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	value = addr[0];

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	switch (value) {
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	case (FPW) INTEL_MANUFACT:
		info->flash_id = FLASH_MAN_INTEL;
		break;
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	default:
		info->flash_id = FLASH_UNKNOWN;
		info->sector_count = 0;
		info->size = 0;
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		addr[0] = (FPW) 0x00FF00FF;	/* restore read mode */
		return (0);			/* no or unknown flash  */
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	}

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	mb ();
	value = addr[1];			/* device ID        */
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	switch (value) {
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	case (FPW) INTEL_ID_28F128J3A:
		info->flash_id += FLASH_28F128J3A;
		info->sector_count = 128;
		info->size = 0x02000000;
		break;				/* => 16 MB     */
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	default:
		info->flash_id = FLASH_UNKNOWN;
		break;
	}

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	if (info->sector_count > CONFIG_SYS_MAX_FLASH_SECT) {
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		printf ("** ERROR: sector count %d > max (%d) **\n",
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			info->sector_count, CONFIG_SYS_MAX_FLASH_SECT);
		info->sector_count = CONFIG_SYS_MAX_FLASH_SECT;
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	}
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	addr[0] = (FPW) 0x00FF00FF;		/* restore read mode */
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	return (info->size);
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}

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

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int flash_erase (flash_info_t *info, int s_first, int s_last)
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{
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	int flag, prot, sect;
	ulong type, start, last;
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	int rcode = 0;
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	if ((s_first < 0) || (s_first > s_last)) {
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		if (info->flash_id == FLASH_UNKNOWN) {
			printf ("- missing\n");
		} else {
			printf ("- no sectors to erase\n");
		}
		return 1;
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	}
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	type = (info->flash_id & FLASH_VENDMASK);
	if ((type != FLASH_MAN_INTEL)) {
		printf ("Can't erase unknown flash type %08lx - aborted\n",
			info->flash_id);
		return 1;
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	}
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	prot = 0;
	for (sect = s_first; sect <= s_last; ++sect) {
		if (info->protect[sect]) {
			prot++;
		}
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	}

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	if (prot) {
		printf ("- Warning: %d protected sectors will not be erased!\n",
			prot);
	} else {
		printf ("\n");
	}

	start = get_timer (0);
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	last = start;
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	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts ();
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	/* Start erase on unprotected sectors */
	for (sect = s_first; sect <= s_last; sect++) {
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		if (info->protect[sect] == 0) {	/* not protected */
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			FPWV *addr = (FPWV *) (info->start[sect]);
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			FPW status;
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			printf ("Erasing sector %2d ... ", sect);
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			/* arm simple, non interrupt dependent timer */
			reset_timer_masked ();
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			*addr = (FPW) 0x00500050;	/* clear status register */
			*addr = (FPW) 0x00200020;	/* erase setup */
			*addr = (FPW) 0x00D000D0;	/* erase confirm */
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			while (((status = *addr) & (FPW) 0x00800080) != (FPW) 0x00800080) {
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				if (get_timer_masked () > CONFIG_SYS_FLASH_ERASE_TOUT) {
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					printf ("Timeout\n");
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					*addr = (FPW) 0x00B000B0;	/* suspend erase     */
					*addr = (FPW) 0x00FF00FF;	/* reset to read mode */
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					rcode = 1;
					break;
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				}
			}
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			*addr = 0x00500050;	/* clear status register cmd.   */
			*addr = 0x00FF00FF;	/* resest to read mode          */
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			printf (" done\n");
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		}
	}
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	return rcode;
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}

/*-----------------------------------------------------------------------
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 * Copy memory to flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 * 4 - Flash not identified
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 */

int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
{
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	ulong cp, wp;
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	FPW data;
	int count, i, l, rc, port_width;
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	if (info->flash_id == FLASH_UNKNOWN) {
		return 4;
	}
/* get lower word aligned address */
#ifdef FLASH_PORT_WIDTH16
	wp = (addr & ~1);
	port_width = 2;
#else
	wp = (addr & ~3);
	port_width = 4;
#endif
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	/*
	 * 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 < port_width && cnt > 0; ++i) {
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			data = (data << 8) | *src++;
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			--cnt;
			++cp;
		}
		for (; cnt == 0 && i < port_width; ++i, ++cp) {
			data = (data << 8) | (*(uchar *) cp);
		}
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		if ((rc = write_data (info, wp, SWAP (data))) != 0) {
			return (rc);
		}
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		wp += port_width;
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	}
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	/*
	 * handle word aligned part
	 */
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	count = 0;
	while (cnt >= port_width) {
		data = 0;
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		for (i = 0; i < port_width; ++i) {
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			data = (data << 8) | *src++;
		}
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		if ((rc = write_data (info, wp, SWAP (data))) != 0) {
			return (rc);
		}
		wp += port_width;
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		cnt -= port_width;
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		if (count++ > 0x800) {
			spin_wheel ();
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			count = 0;
		}
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	}
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	if (cnt == 0) {
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		return (0);
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	}
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	/*
	 * handle unaligned tail bytes
	 */
	data = 0;
	for (i = 0, cp = wp; i < port_width && cnt > 0; ++i, ++cp) {
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		data = (data << 8) | *src++;
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		--cnt;
	}
	for (; i < port_width; ++i, ++cp) {
		data = (data << 8) | (*(uchar *) cp);
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	}

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	return (write_data (info, wp, SWAP (data)));
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}

/*-----------------------------------------------------------------------
 * Write a word or halfword to Flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
static int write_data (flash_info_t *info, ulong dest, FPW data)
{
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	FPWV *addr = (FPWV *) dest;
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	ulong status;
	int flag;

	/* Check if Flash is (sufficiently) erased */
	if ((*addr & data) != data) {
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		printf ("not erased at %08lx (%lx)\n", (ulong) addr, *addr);
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		return (2);
	}
	/* Disable interrupts which might cause a timeout here */
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	flag = disable_interrupts ();
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	*addr = (FPW) 0x00400040;	/* write setup */
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	*addr = data;

	/* arm simple, non interrupt dependent timer */
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	reset_timer_masked ();
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	/* wait while polling the status register */
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	while (((status = *addr) & (FPW) 0x00800080) != (FPW) 0x00800080) {
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		if (get_timer_masked () > CONFIG_SYS_FLASH_WRITE_TOUT) {
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			*addr = (FPW) 0x00FF00FF;	/* restore read mode */
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			return (1);
		}
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	}
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	*addr = (FPW) 0x00FF00FF;	/* restore read mode */
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	return (0);
}

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void inline spin_wheel (void)
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{
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	static int p = 0;
	static char w[] = "\\/-";
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	printf ("\010%c", w[p]);
	(++p == 3) ? (p = 0) : 0;
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}