flash.c

该源码为mpc8248处理器的BSP

/*
 * (C) Copyright 2003
 * Martin Winistoerfer, [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
 */

/*
 * File:		flash.c
 *
 * Discription:		This Driver is for 28F320J3A, 28F640J3A and
 * 			28F128J3A Intel flashs working in 16 Bit mode.
 *			They are single bank flashs.
 *
 *			Most of this code is taken from existing u-boot
 *			source code.
 */
/*几片FLASH*/
#define CFG_MAX_FLASH_BANKS 1
/*每个FLASH有多少块*/
#define CFG_MAX_FLASH_SECT 256

#define FLASH_BASE0_PRELIM FLASH_BASE_ADRS

/*#define DEBUG /**/

#define INTEL_ID_28F320J3A  0x00160016	/*  32M = 128K x  32	*/
#define INTEL_ID_28F640J3A  0x00170017	/*  64M = 128K x  64	*/
#define INTEL_ID_28F128J3A  0x00180018	/* 128M = 128K x 128	*/
#define INTEL_ID_28F256J3A  0x001D001D	/* 256M = 128K x 256	*/

#define FLASH_ID_28F320J3A 0x00C0		/* INTEL 28F320J3A ( 32M = 128K x  32)	*/
#define FLASH_ID_28F640J3A 0x00C2		/* INTEL 28F640J3A ( 64M = 128K x  64)	*/
#define FLASH_ID_28F128J3A 0x00C4		/* INTEL 28F128J3A (128M = 128K x 128)	*/
#define FLASH_ID_28F256J3A 0x00C6		/* INTEL 28F256J3A (256M = 128K x 256)	*/


#define FLASH_ID_UNKNOWN	0xFFFF		/* unknown flash type			*/

/*-----------------------------------------------------------------------
 * Device IDs
 */

#define AMD_MANUFACT	0x00010001	/* AMD	   manuf. ID in D23..D16, D7..D0 */
#define FUJ_MANUFACT	0x00040004	/* FUJITSU manuf. ID in D23..D16, D7..D0 */
#define ATM_MANUFACT	0x001F001F	/* ATMEL */
#define STM_MANUFACT	0x00200020	/* STM (Thomson) manuf. ID in D23.. -"- */
#define SST_MANUFACT	0x00BF00BF	/* SST	   manuf. ID in D23..D16, D7..D0 */
#define MT_MANUFACT	0x00890089	/* MT	   manuf. ID in D23..D16, D7..D0 */
#define INTEL_MANUFACT	0x00890089	/* INTEL   manuf. ID in D23..D16, D7..D0 */
#define INTEL_ALT_MANU	0x00B000B0	/* alternate INTEL namufacturer ID	*/
#define MX_MANUFACT	0x00C200C2	/* MXIC	   manuf. ID in D23..D16, D7..D0 */
#define TOSH_MANUFACT	0x00980098	/* TOSHIBA manuf. ID in D23..D16, D7..D0 */
#define MT2_MANUFACT	0x002C002C	/* alternate MICRON manufacturer ID*/
#define EXCEL_MANUFACT	0x004A004A	/* Excel Semiconductor			*/


/* manufacturer offsets
 */
#define FLASH_MAN_AMD	0x00000000	/* AMD					*/
#define FLASH_MAN_FUJ	0x00010000	/* Fujitsu				*/
#define FLASH_MAN_BM	0x00020000	/* Bright Microelectronics		*/
#define FLASH_MAN_MX	0x00030000	/* MXIC					*/
#define FLASH_MAN_STM	0x00040000
#define FLASH_MAN_TOSH	0x00050000	/* Toshiba				*/
#define FLASH_MAN_EXCEL 0x00060000	/* Excel Semiconductor			*/
#define FLASH_MAN_SST	0x00100000
#define FLASH_MAN_INTEL 0x00300000
#define FLASH_MAN_MT	0x00400000
#define FLASH_MAN_SHARP 0x00500000
#define FLASH_MAN_ATM	0x00600000

#define FLASH_TYPEMASK	0x0000FFFF	/* extract FLASH type	information	*/
#define FLASH_VENDMASK	0xFFFF0000	/* extract FLASH vendor information	*/

/*-----------------------------------------------------------------------
 * FLASH Info: contains chip specific data, per FLASH bank
 */

typedef struct {
	unsigned long	size;			/* total bank size in bytes		*/
	unsigned short	sector_count;		/* number of erase units		*/
	unsigned long	flash_id;		/* combined device & manufacturer code	*/
	unsigned long	start[CFG_MAX_FLASH_SECT];   /* physical sector start addresses */
	unsigned char	protect[CFG_MAX_FLASH_SECT]; /* sector protection status	*/
} flash_info_t;


#define	FLASH_ID_MASK			0xFFFF
#define FLASH_BLOCK_SIZE		0x00020000
#define FLASH_CMD_READ_ID		0x0090
#define FLASH_CMD_RESET			0x00ff
#define FLASH_CMD_BLOCK_ERASE		0x0020
#define FLASH_CMD_ERASE_CONFIRM		0x00D0
#define FLASH_CMD_CLEAR_STATUS		0x0050
#define FLASH_CMD_SUSPEND_ERASE		0x00B0
#define FLASH_CMD_WRITE			0x0040
#define FLASH_CMD_PROTECT		0x0060
#define FLASH_CMD_PROTECT_SET		0x0001
#define FLASH_CMD_PROTECT_CLEAR		0x00D0
#define FLASH_STATUS_DONE		0x0080

flash_info_t	flash_info[CFG_MAX_FLASH_BANKS];

/*--------------------------------------------------------------------*
* CPU 时钟周期:  50 Mhz 860 -- 20ns,  200 Mhz 8260 -- 5ns
*---------------------------------------------------------------------*/
#define CLOCK_860 			20 	
#define CLOCK_8260 			5
#define CLOCK_ARM7                3
#define CPU_CLOCK 			CLOCK_8260
/*
 * Local function prototypes
 */
static unsigned long 	flash_get_size 		(volatile unsigned short *addr, flash_info_t *info);
static int 	write_short 		(flash_info_t *info, unsigned long dest, unsigned short data);
static void 	flash_get_offsets 	(unsigned long base, flash_info_t *info);

/*===============================================
*   
*   辅助:   helper function for time delay
*   
*===============================================*/
void DelayTime( unsigned long Tns )
{
    unsigned long i;
	
    for (i=0; i<Tns/CPU_CLOCK; i++);
}

/* 1000 纳秒:  写FALSH 时延*/
#define DELAY_TIME 			20

/* program/erase operation inner algorithm be in progress or have been completed */
/* 最大轮询时间: 将近118 秒*/
#define POLL_TIME 			10000

int disable_interrupts(void)
{
    return 0;
}
void enable_interrupts(void)
{
}

/*
 * Initialize flash
 */
unsigned long flash_init_flag =0;
unsigned long flash_init (void)
{
	unsigned long size_b0;
	int i;

        flash_init_flag=0xacce;
        
	/* Init: no FLASHes known */
	for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
		flash_info[i].flash_id = FLASH_ID_UNKNOWN;
	}

	/* Static FLASH Bank configuration here - FIXME XXX */
	size_b0 = flash_get_size((volatile unsigned short *)FLASH_BASE0_PRELIM, &flash_info[0]);

	if (flash_info[0].flash_id == FLASH_ID_UNKNOWN) {
		printf ("## Unknown FLASH on Bank 0: ID 0x%lx, Size = 0x%08lx = %ld MB\n",
			flash_info[0].flash_id,
			size_b0, size_b0<<20);
	}

	flash_get_offsets (FLASH_BASE0_PRELIM, &flash_info[0]);

	flash_info[0].size = size_b0;

	return size_b0;
}

/*
 * Compute start adress of each sector (block)
 */

static void flash_get_offsets (unsigned long base, flash_info_t *info)
{
	int i;

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

	switch (info->flash_id & FLASH_VENDMASK) {
	case FLASH_MAN_INTEL:
	    for (i = 0; i < info->sector_count; i++) {
		info->start[i] = base + i * FLASH_BLOCK_SIZE;
	    }
	    return;

	default:
	    printf ("Don't know sector offsets for flash type 0x%lx\n",
		info->flash_id);
	    return;
	}
}

/*
 * Print flash information
 */
void flash_print_info  (flash_info_t *info)
{
	int i;

	if (info->flash_id == FLASH_ID_UNKNOWN) {
		printf ("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_SST:	printf ("SST ");		break;
	case FLASH_MAN_STM:	printf ("STM ");		break;
	case FLASH_MAN_INTEL:	printf ("Intel ");		break;
	case FLASH_MAN_MT:	printf ("MT ");			break;
	default:		printf ("Unknown Vendor ");	break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_ID_28F320J3A:	printf ("28F320J3A (32Mbit) 16-Bit\n");
				break;
	case FLASH_ID_28F640J3A:	printf ("28F640J3A (64Mbit) 16-Bit\n");
				break;
	case FLASH_ID_28F128J3A:	printf ("28F128J3A (128Mbit) 16-Bit\n");
				break;
	default:		printf ("Unknown Chip Type\n");
				break;
	}

	if (info->size >= (1 << 20)) {
		i = 20;
	} else {
		i = 10;
	}
	printf ("  Size: %ld %cB in %d Sectors\n",
		info->size >> i,
		(i == 20) ? 'M' : 'k',
		info->sector_count);

	printf ("  Sector Start Addresses:");
	for (i=0; i<info->sector_count; ++i) {
		if ((i % 5) == 0)
			printf ("\n   ");
		printf (" %08lX%s",
			info->start[i],
			info->protect[i] ? " (RO)" : "     "
		);
	}
	printf ("\n");
	return;
}
/*
 * Get size of flash in bytes.
 * The following code cannot be run from FLASH!
 */

static unsigned long flash_get_size (volatile unsigned short *addr, flash_info_t *info)
{
	volatile unsigned short value;

	/* Read Manufacturer ID */
	addr[0] = FLASH_CMD_READ_ID;
	value = addr[0];

	switch (value) {
	case (AMD_MANUFACT & FLASH_ID_MASK):
		info->flash_id = FLASH_MAN_AMD;
		break;
	case (FUJ_MANUFACT & FLASH_ID_MASK):
		info->flash_id = FLASH_MAN_FUJ;
		break;
	case (SST_MANUFACT & FLASH_ID_MASK):
		info->flash_id = FLASH_MAN_SST;
		break;
	case (STM_MANUFACT & FLASH_ID_MASK):
		info->flash_id = FLASH_MAN_STM;
		break;
	case (INTEL_MANUFACT & FLASH_ID_MASK):
		info->flash_id = FLASH_MAN_INTEL;
		break;
	default:
		info->flash_id = FLASH_ID_UNKNOWN;
		info->sector_count = 0;
		info->size = 0;
		addr[0] = FLASH_CMD_RESET;	/* restore read mode */
		return (0);			/* no or unknown flash	*/
	}

	value = addr[1];			/* device ID		*/

	switch (value) {
	case (INTEL_ID_28F320J3A  & FLASH_ID_MASK):
		info->flash_id += FLASH_ID_28F320J3A;
		info->sector_count = 32;
		info->size = 0x00400000;
		break;				/* =>  32 MBit		*/

	case (INTEL_ID_28F640J3A & FLASH_ID_MASK):
		info->flash_id += FLASH_ID_28F640J3A;
		info->sector_count = 64;
		info->size = 0x00800000;
		break;				/* => 64 MBit		*/

	case (INTEL_ID_28F128J3A & FLASH_ID_MASK):
		info->flash_id += FLASH_ID_28F128J3A;
		info->sector_count = 128;
		info->size = 0x01000000;