flash.c

omap osk环境下的bootloader,包含完整的uboot源代码

/*
 * (C) Copyright 2001
 * Josh Huber <[e-mail]>, Mission Critical Linux, Inc.
 *
 * 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
 */

/*
 * flash.c - flash support for the 512k, 8bit boot flash
 	and the 8MB 32bit extra flash on the DB64360
 *           most of this file was based on the existing U-Boot
 *           flash drivers.
 *
 * written or collected and sometimes rewritten by
 * Ingo Assmus <[e-mail]>
 *
 */

#include <common.h>
#include <mpc8xx.h>
#include "../include/mv_gen_reg.h"
#include "../include/memory.h"
#include "intel_flash.h"

#define FLASH_ROM       0xFFFD	/* unknown flash type                   */
#define FLASH_RAM       0xFFFE	/* unknown flash type                   */
#define FLASH_MAN_UNKNOWN 0xFFFF0000

/* #define DEBUG */

/* Intel flash commands */
int flash_erase_intel (flash_info_t * info, int s_first, int s_last);
int write_word_intel (bank_addr_t addr, bank_word_t value);

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

/*-----------------------------------------------------------------------
 * Functions
 */
static ulong flash_get_size (int portwidth, 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 int i;
	unsigned long size_b0 = 0, size_b1 = 0;
	unsigned long base, flash_size;

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

	/* the boot flash */
	base = CFG_FLASH_BASE;
	size_b0 =
		flash_get_size (CFG_BOOT_FLASH_WIDTH, (vu_long *) base,
				&flash_info[0]);

	printf ("[%ldkB@%lx] ", size_b0 / 1024, base);

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

	base = memoryGetDeviceBaseAddress (CFG_EXTRA_FLASH_DEVICE);
/*	base = memoryGetDeviceBaseAddress(DEV_CS3_BASE_ADDR);*/
	for (i = 1; i < CFG_MAX_FLASH_BANKS; i++) {
		unsigned long size =
			flash_get_size (CFG_EXTRA_FLASH_WIDTH,
					(vu_long *) base, &flash_info[i]);

		printf ("[%ldMB@%lx] ", size >> 20, base);

		if (flash_info[i].flash_id == FLASH_UNKNOWN) {
			if (i == 1) {
				printf ("## Unknown FLASH at %08lx: Size = 0x%08lx = %ld MB\n", base, size_b1, size_b1 << 20);
			}
			break;
		}
		size_b1 += size;
		base += size;
	}

	flash_size = size_b0 + size_b1;
	return flash_size;
}

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

	if (!info->sector_count)
		return;

	/* set up sector start address table */
	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AM040:
	case FLASH_28F128J3A:
	case FLASH_28F640J3A:
	case FLASH_RAM:
		/* this chip has uniformly spaced sectors */
		sector_size = info->size / info->sector_count;
		for (i = 0; i < info->sector_count; i++)
			info->start[i] = base + (i * sector_size);
		break;
	default:
		if (info->flash_id & FLASH_BTYPE) {
			/* set sector offsets for bottom boot block type    */
			info->start[0] = base + 0x00000000;
			info->start[1] = base + 0x00008000;
			info->start[2] = base + 0x0000C000;
			info->start[3] = base + 0x00010000;
			for (i = 4; i < info->sector_count; i++) {
				info->start[i] =
					base + (i * 0x00020000) - 0x00060000;
			}
		} else {
			/* set sector offsets for top boot block type               */
			i = info->sector_count - 1;
			info->start[i--] = base + info->size - 0x00008000;
			info->start[i--] = base + info->size - 0x0000C000;
			info->start[i--] = base + info->size - 0x00010000;
			for (; i >= 0; i--) {
				info->start[i] = base + i * 0x00020000;
			}
		}
	}
}

/*-----------------------------------------------------------------------
 */
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 FLASH_MAN_STM:
		printf ("STM ");
		break;
	case FLASH_MAN_AMD:
		printf ("AMD ");
		break;
	case FLASH_MAN_FUJ:
		printf ("FUJITSU ");
		break;
	case FLASH_MAN_INTEL:
		printf ("INTEL ");
		break;
	default:
		printf ("Unknown Vendor ");
		break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AM040:
		printf ("AM29LV040B (4 Mbit, bottom boot sect)\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;
	case FLASH_28F640J3A:
		printf ("28F640J3A (64 Mbit)\n");
		break;
	case FLASH_28F128J3A:
		printf ("28F128J3A (128 Mbit)\n");
		break;
	case FLASH_ROM:
		printf ("ROM\n");
		break;
	case FLASH_RAM:
		printf ("RAM\n");
		break;
	default:
		printf ("Unknown Chip Type\n");
		break;
	}

	if ((info->size >> 20) > 0) {
		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);
	}

	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;
}

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


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

/*
 * The following code cannot be run from FLASH!
 */

static inline void flash_cmd (int width, volatile unsigned char *addr,
			      int offset, unsigned char cmd)
{
	/* supports 1x8, 1x16, and 2x16 */
	/* 2x8 and 4x8 are not supported */
	if (width == 4) {
		/* assuming chips are in 16 bit mode */
		/* 2x16 */
		unsigned long cmd32 = (cmd << 16) | cmd;

		*(volatile unsigned long *) (addr + offset * 2) = cmd32;
	} else {
		/* 1x16 or 1x8 */
		*(volatile unsigned char *) (addr + offset) = cmd;
	}
}

static ulong
flash_get_size (int portwidth, vu_long * addr, flash_info_t * info)
{
	short i;
	volatile unsigned char *caddr = (unsigned char *) addr;
	volatile unsigned short *saddr = (unsigned short *) addr;
	volatile unsigned long *laddr = (unsigned long *) addr;
	char old[2], save;
	ulong id = 0, manu = 0, base = (ulong) addr;

#ifdef DEBUG
	printf ("%s: enter\n", __FUNCTION__);
#endif
	info->portwidth = portwidth;

	save = *caddr;

	flash_cmd (portwidth, caddr, 0, 0xf0);
	flash_cmd (portwidth, caddr, 0, 0xf0);

	udelay (10);

	old[0] = caddr[0];
	old[1] = caddr[1];


	if (old[0] != 0xf0) {
		flash_cmd (portwidth, caddr, 0, 0xf0);
		flash_cmd (portwidth, caddr, 0, 0xf0);

		udelay (10);

		if (*caddr == 0xf0) {
			/* this area is ROM */
			*caddr = save;
			info->flash_id = FLASH_ROM + FLASH_MAN_UNKNOWN;
			info->sector_count = 8;
			info->size = 0x80000;
			flash_get_offsets (base, info);
			return info->size;
		}
	} else {
		*caddr = 0;

		udelay (10);

		if (*caddr == 0) {
			/* this area is RAM */
			*caddr = save;
			info->flash_id = FLASH_RAM + FLASH_MAN_UNKNOWN;
			info->sector_count = 8;
			info->size = 0x80000;
			flash_get_offsets (base, info);
			return info->size;
		}
		flash_cmd (portwidth, caddr, 0, 0xf0);

		udelay (10);
	}

	/* Write auto select command: read Manufacturer ID */
	flash_cmd (portwidth, caddr, 0x555, 0xAA);
	flash_cmd (portwidth, caddr, 0x2AA, 0x55);
	flash_cmd (portwidth, caddr, 0x555, 0x90);

	udelay (10);

	if ((caddr[0] == old[0]) && (caddr[1] == old[1])) {

		/* this area is ROM */
		info->flash_id = FLASH_ROM + FLASH_MAN_UNKNOWN;
		info->sector_count = 8;
		info->size = 0x80000;
		flash_get_offsets (base, info);
		return info->size;
#ifdef DEBUG
	} else {
		printf ("%px%d: %02x:%02x -> %02x:%02x\n",
			caddr, portwidth, old[0], old[1], caddr[0], caddr[1]);
#endif
	}

	switch (portwidth) {
	case 1:
		manu = caddr[0];
		manu |= manu << 16;
		id = caddr[1];
		break;
	case 2:
		manu = saddr[0];
		manu |= manu << 16;
		id = saddr[1];
		id |= id << 16;
		break;
	case 4:
		manu = laddr[0];
		id = laddr[1];
		break;
	}

#ifdef DEBUG
	flash_cmd (portwidth, caddr, 0, 0xf0);

	printf ("\n%08lx:%08lx:%08lx\n", base, manu, id);
	printf ("%08lx %08lx %08lx %08lx\n",
		laddr[0], laddr[1], laddr[2], laddr[3]);
#endif

	switch (manu) {
	case STM_MANUFACT:
		info->flash_id = FLASH_MAN_STM;
		break;
	case AMD_MANUFACT:
		info->flash_id = FLASH_MAN_AMD;
		break;
	case FUJ_MANUFACT:
		info->flash_id = FLASH_MAN_FUJ;
		break;
	case INTEL_MANUFACT:
		info->flash_id = FLASH_MAN_INTEL;
		break;
	default:
		flash_cmd (portwidth, caddr, 0, 0xf0);

		printf ("Unknown Mfr [%08lx]:%08lx\n", manu, id);
		info->flash_id = FLASH_UNKNOWN;
		info->sector_count = 0;
		info->size = 0;
		return (0);	/* no or unknown flash  */
	}

	switch (id) {
	case AMD_ID_LV400T:
		info->flash_id += FLASH_AM400T;
		info->sector_count = 11;
		info->size = 0x00100000;
		info->chipwidth = 1;
		break;		/* => 1 MB      */

	case AMD_ID_LV400B:
		info->flash_id += FLASH_AM400B;
		info->sector_count = 11;
		info->size = 0x00100000;
		info->chipwidth = 1;
		break;		/* => 1 MB      */

	case AMD_ID_LV800T:
		info->flash_id += FLASH_AM800T;
		info->sector_count = 19;
		info->size = 0x00200000;
		info->chipwidth = 1;
		break;		/* => 2 MB      */

	case AMD_ID_LV800B:
		info->flash_id += FLASH_AM800B;
		info->sector_count = 19;
		info->size = 0x00200000;
		info->chipwidth = 1;
		break;		/* => 2 MB      */

	case AMD_ID_LV160T:
		info->flash_id += FLASH_AM160T;
		info->sector_count = 35;
		info->size = 0x00400000;
		info->chipwidth = 1;
		break;		/* => 4 MB      */

	case AMD_ID_LV160B:
		info->flash_id += FLASH_AM160B;
		info->sector_count = 35;
		info->size = 0x00400000;
		info->chipwidth = 1;
		break;		/* => 4 MB      */
#if 0				/* enable when device IDs are available */
	case AMD_ID_LV320T:
		info->flash_id += FLASH_AM320T;
		info->sector_count = 67;
		info->size = 0x00800000;
		break;		/* => 8 MB      */

	case AMD_ID_LV320B:
		info->flash_id += FLASH_AM320B;
		info->sector_count = 67;
		info->size = 0x00800000;
		break;		/* => 8 MB      */
#endif
	case AMD_ID_LV040B:
		info->flash_id += FLASH_AM040;
		info->sector_count = 8;
		info->size = 0x80000;
		info->chipwidth = 1;
		break;		/* => 512 kB    */

	case INTEL_ID_28F640J3A:
		info->flash_id += FLASH_28F640J3A;
		info->sector_count = 64;
		info->size = 128 * 1024 * 64;	/* 128kbytes x 64 blocks */
		info->chipwidth = 2;
		if (portwidth == 4)
			info->size *= 2;	/* 2x16 */
		break;

	case INTEL_ID_28F128J3A:
		info->flash_id += FLASH_28F128J3A;
		info->sector_count = 128;
		info->size = 128 * 1024 * 128;	/* 128kbytes x 128 blocks */
		info->chipwidth = 2;
		if (portwidth == 4)
			info->size *= 2;	/* 2x16 */
		break;

	default:
		flash_cmd (portwidth, caddr, 0, 0xf0);

		printf ("Unknown id %lx:[%lx]\n", manu, id);
		info->flash_id = FLASH_UNKNOWN;
		info->chipwidth = 1;
		return (0);	/* => no or unknown flash */

	}

	flash_get_offsets (base, info);


	/* 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]);
		saddr = (volatile unsigned short *) (info->start[i]);
		laddr = (volatile unsigned long *) (info->start[i]);
		if (portwidth == 1)
			info->protect[i] = caddr[2] & 1;
		else if (portwidth == 2)
			info->protect[i] = saddr[2] & 1;
		else
			info->protect[i] = laddr[2] & 1;
	}

	/*
	 * Prevent writes to uninitialized FLASH.
	 */
	if (info->flash_id != FLASH_UNKNOWN) {
		caddr = (volatile unsigned char *) info->start[0];

		flash_cmd (portwidth, caddr, 0, 0xF0);	/* reset bank */
	}

	return (info->size);
}

int flash_erase (flash_info_t * info, int s_first, int s_last)
{
	volatile unsigned char *addr = (char *) (info->start[0]);
	int flag, prot, sect, l_sect;
	ulong start, now, last;

/* modified to support 2x16 Intel flash */
/* Note that the code will not exit on a flash erasure error or timeout */
/* but will print and error message and continue processing sectors */
/* until they are all erased. */
/* 10-16-2002 P. Marchese */