flash.c

使用ADS,用仿真器烧写程序到nor flash。 具体操作见src/main.c的注释。 PS:yf255_sdram_init.txt为cpu的初始化脚本。

/*
 * (C) Copyright 2001
 * Kyle Harris, Nexus Technologies, Inc. [e-mail]
 *
 * (C) Copyright 2001
 * Wolfgang Denk, DENX Software Engineering, [e-mail].
 *
 * 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 "pxa.h"
#include "flash.h"
#include "serial.h"
#include "types.h"
#include "time.h"


flash_info_t flash_info[CFG_MAX_FLASH_BANKS];	/* info for FLASH chips    */

/* Board support for 1 or 2 flash devices */
#define FLASH_PORT_WIDTH32

#define FLASH_PORT_WIDTH		ulong
#define FLASH_PORT_WIDTHV		vu_long


#define FPW	   FLASH_PORT_WIDTH
#define FPWV   FLASH_PORT_WIDTHV

#define __swab32(x) \
	((u32)( \
		(((u32)(x) & (u32)0x000000ffUL) << 24) | \
		(((u32)(x) & (u32)0x0000ff00UL) <<  8) | \
		(((u32)(x) & (u32)0x00ff0000UL) >>  8) | \
		(((u32)(x) & (u32)0xff000000UL) >> 24) ))

#define SWAP(x)   __swab32(x)

void mb()
{
	 __asm {
	 nop;
	 }
}

/*-----------------------------------------------------------------------
 * Functions
 */
static ulong flash_get_size (FPW *addr, flash_info_t *info);
static int write_data (flash_info_t *info, ulong dest, FPW data);
static void flash_get_offsets (ulong base, flash_info_t *info);
void spin_wheel (void);

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

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

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

/*-----------------------------------------------------------------------
 */
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;
		}
	}
}

/*-----------------------------------------------------------------------
 */
void flash_print_info (flash_info_t *info)
{
	if (info->flash_id == FLASH_UNKNOWN) {
		SerialOutputString ("missing or unknown FLASH type\n");
		return;
	}

	switch (info->flash_id & FLASH_VENDMASK) {
	case FLASH_MAN_INTEL:
		SerialOutputString ("FLASH_MAN_INTEL\r\n");
		break;
	default:
		SerialOutputString ("Unknown Vendor\r\n");
		break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_28F128J3A:
		SerialOutputString ("28F128J3A\r\n");
		break;
	default:
		SerialOutputString ("Unknown Chip Type\r\n");
		break;
	}
	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 */
	addr[0x5555] = (FPW) 0x00AA00AA;
	addr[0x2AAA] = (FPW) 0x00550055;
	addr[0x5555] = (FPW) 0x00900090;

	mb();
	value = addr[0];

	switch (value) {

	case (FPW) INTEL_MANUFACT:
		info->flash_id = FLASH_MAN_INTEL;
		break;

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

	mb ();
	value = addr[1];			/* device ID        */

	switch (value) {

	case (FPW) INTEL_ID_28F128J3A:
		info->flash_id += FLASH_28F128J3A;
		info->sector_count = 128;
		info->size = 0x02000000;
		break;				/* => 16 MB     */

	default:
		info->flash_id = FLASH_UNKNOWN;
		break;
	}

	addr[0] = (FPW) 0x00FF00FF;		/* restore read mode */

	return (info->size);
}

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

int flash_erase (flash_info_t *info, int s_first, int s_last)
{
	int prot, sect;
	ulong type, start, last;
	int rcode = 0;

	if ((s_first < 0) || (s_first > s_last)) {
		if (info->flash_id == FLASH_UNKNOWN) {
			SerialOutputString ("- missing\r\n");
		} else {
			SerialOutputString ("- no sectors to erase\r\n");
		}
		return 1;
	}

	type = (info->flash_id & FLASH_VENDMASK);
	if ((type != FLASH_MAN_INTEL)) {
		SerialOutputString ("Can't erase unknown flash type");
		SerialOutputHex (info->flash_id);
		SerialOutputString("- aborted\r\n");
	
		return 1;
	}

	prot = 0;
	for (sect = s_first; sect <= s_last; ++sect) {
		if (info->protect[sect]) {
			prot++;
		}
	}

	if (prot) {
		SerialOutputString ("- Warning: ");
		SerialOutputDec(prot);
		SerialOutputString(" protected sectors will not be erased!\r\n");
	} else {
		SerialOutputString ("\r\n");
	}

	start = get_timer (0);
	last = start;


	/* Start erase on unprotected sectors */
	for (sect = s_first; sect <= s_last; sect++) {
		if (info->protect[sect] == 0) {	/* not protected */
			FPWV *addr = (FPWV *) (info->start[sect]);
			FPW status;

			SerialOutputString ("Erasing sector ");
			SerialOutputDec (sect);
			SerialOutputString(" ... \r\n");

			/* arm simple, non interrupt dependent timer */
			reset_timer_masked ();

			*addr = (FPW) 0x00500050;	/* clear status register */
			*addr = (FPW) 0x00200020;	/* erase setup */
			*addr = (FPW) 0x00D000D0;	/* erase confirm */

			while (((status = *addr) & (FPW) 0x00800080) != (FPW) 0x00800080) {
				if (get_timer_masked () > CFG_FLASH_ERASE_TOUT) {
					SerialOutputString ("Timeout\n");
					*addr = (FPW) 0x00B000B0;	/* suspend erase     */
					*addr = (FPW) 0x00FF00FF;	/* reset to read mode */
					rcode = 1;
					break;
				}
			}

			*addr = 0x00500050;	/* clear status register cmd.   */
			*addr = 0x00FF00FF;	/* resest to read mode          */

			SerialOutputString (" done\n");
		}
	}
	return rcode;
}


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

int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
{
	ulong cp, wp;
	FPW data;
	int count, i, l, rc, port_width;

	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

	/*
	 * 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) {
			data = (data << 8) | *src++;
			--cnt;
			++cp;
		}
		for (; cnt == 0 && i < port_width; ++i, ++cp) {
			data = (data << 8) | (*(uchar *) cp);
		}

		if ((rc = write_data (info, wp, SWAP (data))) != 0) {
			return (rc);
		}
		wp += port_width;
	}

	/*
	 * handle word aligned part
	 */
	count = 0;
	while (cnt >= port_width) {
		data = 0;
		for (i = 0; i < port_width; ++i) {
			data = (data << 8) | *src++;
		}
		if ((rc = write_data (info, wp, SWAP (data))) != 0) {
			return (rc);
		}
		wp += port_width;
		cnt -= port_width;
		if (count++ > 0x800) {
			spin_wheel ();
			count = 0;
		}
	}

	if (cnt == 0) {
		return (0);
	}

	/*
	 * handle unaligned tail bytes
	 */
	data = 0;
	for (i = 0, cp = wp; i < port_width && cnt > 0; ++i, ++cp) {
		data = (data << 8) | *src++;
		--cnt;
	}
	for (; i < port_width; ++i, ++cp) {
		data = (data << 8) | (*(uchar *) cp);
	}

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

/*-----------------------------------------------------------------------
 * 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)
{
	FPWV *addr = (FPWV *) dest;
	ulong status;


	/* Check if Flash is (sufficiently) erased */
	if ((*addr & data) != data) {
		SerialOutputString ("not erased at ");
		SerialOutputHex ((ulong) addr);
		SerialOutputHex (*addr);
		SerialOutputString ("   ");
		SerialOutputString ("\r\n");
		
		return (2);
	}


	*addr = (FPW) 0x00400040;	/* write setup */
	*addr = data;

	/* arm simple, non interrupt dependent timer */
	reset_timer_masked ();

	/* wait while polling the status register */
	while (((status = *addr) & (FPW) 0x00800080) != (FPW) 0x00800080) {
		if (get_timer_masked () > CFG_FLASH_WRITE_TOUT) {
			*addr = (FPW) 0x00FF00FF;	/* restore read mode */
			return (1);
		}
	}

	*addr = (FPW) 0x00FF00FF;	/* restore read mode */

	return (0);
}

void spin_wheel (void)
{
	static int p = 0;
	static char w[] = "\\/-";

	SerialOutputChar (w[p]);
	(++p == 3) ? (p = 0) : 0;
}

void flash_erase_flash (int s_first, int s_last)
{
	flash_erase (flash_info, s_first, s_last);
}

void flash_download_from_mem(uchar* src, ulong addr, ulong cnt)
{
	int result;
	result = write_buff (flash_info, src, addr, cnt);
	
	switch (result)
	{
		case 0:
			SerialOutputString ("OK\r\n");
			break;
		case 1:
			SerialOutputString ("write timeout\r\n");
			break;
		case 2:
			SerialOutputString ("Flash not erased\r\n");
			break;
		case 4:
		 	SerialOutputString ("Flash not identified\r\n");
			break;
		default:
			break;
	}
}