flash.c

gumstiz u-boot loader in linux

/*
 * (C) Copyright 2000, 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
 */

/*
 * Modified 4/5/2001
 * Wait for completion of each sector erase command issued
 * 4/5/2001
 * Chris Hallinan - DS4.COM, Inc. - [e-mail]
 */

/*
 * Modified 3/7/2001
 * - adapted for pip405, Denis Peter, MPL AG Switzerland
 * TODO:
 * clean-up
 */

#include <common.h>

#if !defined(CONFIG_PATI)
#include <ppc4xx.h>
#include <asm/processor.h>
#include "common_util.h"
#if defined(CONFIG_MIP405)
#include "../mip405/mip405.h"
#endif
#if defined(CONFIG_PIP405)
#include "../pip405/pip405.h"
#endif
#include <405gp_pci.h>
#else /* defined(CONFIG_PATI) */
#include <mpc5xx.h>
#endif

flash_info_t	flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips	*/
/*-----------------------------------------------------------------------
 * Functions
 */
static ulong flash_get_size (vu_long *addr, flash_info_t *info);
static int write_word (flash_info_t *info, ulong dest, ulong data);

void unlock_intel_sectors(flash_info_t *info,ulong addr,ulong cnt);

#define ADDR0           0x5555
#define ADDR1           0x2aaa
#define FLASH_WORD_SIZE unsigned short

#define FALSE           0
#define TRUE            1

#if !defined(CONFIG_PATI)

/*-----------------------------------------------------------------------
 * Some CS switching routines:
 *
 * On PIP/MIP405 we have 3 (4) possible boot mode
 *
 * - Boot from Flash (Flash CS = CS0, MPS CS = CS1)
 * - Boot from MPS   (Flash CS = CS1, MPS CS = CS0)
 * - Boot from PCI with Flash map (Flash CS = CS0, MPS CS = CS1)
 * - Boot from PCI with MPS map   (Flash CS = CS1, MPS CS = CS0)
 * The flash init is the first board specific routine which is called
 * after code relocation (running from SDRAM)
 * The first thing we do is to map the Flash CS to the Flash area and
 * the MPS CS to the MPS area. Since the flash size is unknown at this
 * point, we use the max flash size and the lowest flash address as base.
 *
 * After flash detection we adjust the size of the CS area accordingly.
 * The board_init_r will fill in wrong values in the board init structure,
 * but this will be fixed in the misc_init_r routine:
 * bd->bi_flashstart=0-flash_info[0].size
 * bd->bi_flashsize=flash_info[0].size-CFG_MONITOR_LEN
 * bd->bi_flashoffset=0
 *
 */
int get_boot_mode(void)
{
	unsigned long pbcr;
	int res = 0;
	pbcr = mfdcr (strap);
	if ((pbcr & PSR_ROM_WIDTH_MASK) == 0)
		/* boot via MPS or MPS mapping */
		res = BOOT_MPS;
	if(pbcr & PSR_ROM_LOC)
		/* boot via PCI.. */
		res |= BOOT_PCI;
	 return res;
}

/* Map the flash high (in boot area)
   This code can only be executed from SDRAM (after relocation).
*/
void setup_cs_reloc(void)
{
	int mode;
	/* Since we are relocated, we can set-up the CS finaly
	 * but first of all, switch off PCI mapping (in case it was a PCI boot) */
	out32r(PMM0MA,0L);
	icache_enable (); /* we are relocated */
	/* get boot mode */
	mode=get_boot_mode();
	/* we map the flash high in every case */
	/* first findout on which cs the flash is */
	if(mode & BOOT_MPS) {
		/* map flash high on CS1 and MPS on CS0 */
		mtdcr (ebccfga, pb0ap);
		mtdcr (ebccfgd, MPS_AP);
		mtdcr (ebccfga, pb0cr);
		mtdcr (ebccfgd, MPS_CR);
		/* we use the default values (max values) for the flash
		 * because its real size is not yet known */
		mtdcr (ebccfga, pb1ap);
		mtdcr (ebccfgd, FLASH_AP);
		mtdcr (ebccfga, pb1cr);
		mtdcr (ebccfgd, FLASH_CR_B);
	}
	else {
		/* map flash high on CS0 and MPS on CS1 */
		mtdcr (ebccfga, pb1ap);
		mtdcr (ebccfgd, MPS_AP);
		mtdcr (ebccfga, pb1cr);
		mtdcr (ebccfgd, MPS_CR);
		/* we use the default values (max values) for the flash
		 * because its real size is not yet known */
		mtdcr (ebccfga, pb0ap);
		mtdcr (ebccfgd, FLASH_AP);
		mtdcr (ebccfga, pb0cr);
		mtdcr (ebccfgd, FLASH_CR_B);
	}
}

#endif /* #if !defined(CONFIG_PATI) */

unsigned long flash_init (void)
{
	unsigned long size_b0;
	int i;

#if !defined(CONFIG_PATI)
	unsigned long size_b1,flashcr,size_reg;
	int mode;
	extern char version_string;
	char *p=&version_string;

	/* Since we are relocated, we can set-up the CS finally */
	setup_cs_reloc();
	/* get and display boot mode */
	mode=get_boot_mode();
	if(mode & BOOT_PCI)
		printf("(PCI Boot %s Map) ",(mode & BOOT_MPS) ?
			"MPS" : "Flash");
	else
		printf("(%s Boot) ",(mode & BOOT_MPS) ?
			"MPS" : "Flash");
#endif /* #if !defined(CONFIG_PATI) */
	/* Init: no FLASHes known */
	for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
		flash_info[i].flash_id = FLASH_UNKNOWN;
	}

	/* Static FLASH Bank configuration here - FIXME XXX */

	size_b0 = flash_get_size((vu_long *)CFG_MONITOR_BASE, &flash_info[0]);

	if (flash_info[0].flash_id == FLASH_UNKNOWN) {
		printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
			size_b0, size_b0<<20);
	}
	/* protect the bootloader */
	/* Monitor protection ON by default */
#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
	flash_protect(FLAG_PROTECT_SET,
			CFG_MONITOR_BASE,
			CFG_MONITOR_BASE+monitor_flash_len-1,
			&flash_info[0]);
#endif
#if !defined(CONFIG_PATI)
	/* protect reset vector */
	flash_info[0].protect[flash_info[0].sector_count-1] = 1;
	size_b1 = 0 ;
	flash_info[0].size = size_b0;
	/* set up flash cs according to the size */
	size_reg=(flash_info[0].size >>20);
	switch (size_reg) {
		case 0:
		case 1: i=0; break; /* <= 1MB */
		case 2: i=1; break; /* = 2MB */
		case 4: i=2; break; /* = 4MB */
		case 8: i=3; break; /* = 8MB */
		case 16: i=4; break; /* = 16MB */
		case 32: i=5; break; /* = 32MB */
		case 64: i=6; break; /* = 64MB */
		case 128: i=7; break; /*= 128MB */
		default:
			printf("\n #### ERROR, wrong size %ld MByte reset board #####\n",size_reg);
			while(1);
	}
	if(mode & BOOT_MPS) {
		/* flash is on CS1 */
		mtdcr(ebccfga, pb1cr);
		flashcr = mfdcr (ebccfgd);
		/* we map the flash high in every case */
		flashcr&=0x0001FFFF; /* mask out address bits */
		flashcr|= ((0-flash_info[0].size) & 0xFFF00000); /* start addr */
		flashcr|= (i << 17); /* size addr */
		mtdcr(ebccfga, pb1cr);
		mtdcr(ebccfgd, flashcr);
	}
	else {
		/* flash is on CS0 */
		mtdcr(ebccfga, pb0cr);
		flashcr = mfdcr (ebccfgd);
		/* we map the flash high in every case */
		flashcr&=0x0001FFFF; /* mask out address bits */
		flashcr|= ((0-flash_info[0].size) & 0xFFF00000); /* start addr */
		flashcr|= (i << 17); /* size addr */
		mtdcr(ebccfga, pb0cr);
		mtdcr(ebccfgd, flashcr);
	}
#if 0
	/* enable this (PIP405/MIP405 only) if you want to test if
	   the relocation has be done ok.
	   This will disable both Chipselects */
	mtdcr (ebccfga, pb0cr);
	mtdcr (ebccfgd, 0L);
	mtdcr (ebccfga, pb1cr);
	mtdcr (ebccfgd, 0L);
	printf("CS0 & CS1 switched off for test\n");
#endif
	/* patch version_string */
	for(i=0;i<0x100;i++) {
		if(*p=='\n') {
			*p=0;
			break;
		}
		p++;
	}
#else /* #if !defined(CONFIG_PATI) */
#ifdef	CFG_ENV_IS_IN_FLASH
	/* ENV protection ON by default */
	flash_protect(FLAG_PROTECT_SET,
		      CFG_ENV_ADDR,
		      CFG_ENV_ADDR+CFG_ENV_SECT_SIZE-1,
		      &flash_info[0]);
#endif
#endif /* #if !defined(CONFIG_PATI) */
	return (size_b0);
}


/*-----------------------------------------------------------------------
 */
void flash_print_info  (flash_info_t *info)
{
	int i;
	int k;
	int size;
	int erased;
	volatile unsigned long *flash;

	if (info->flash_id == FLASH_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_INTEL:	printf ("Intel ");		break;
	default:		printf ("Unknown Vendor ");	break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AM040:	printf ("AM29F040 (512 Kbit, uniform sector size)\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_SST800A:	printf ("SST39LF/VF800 (8 Mbit, uniform sector size)\n");
				break;
	case FLASH_SST160A:	printf ("SST39LF/VF160 (16 Mbit, uniform sector size)\n");
				break;
	case FLASH_INTEL320T:	printf ("TE28F320C3 (32 Mbit, top sector size)\n");
				break;
	case FLASH_AM640U:	printf ("AM29LV640U (64 Mbit, uniform sector size)\n");
				break;
	default:		printf ("Unknown Chip Type\n");
				break;
	}

	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) {
		/*
		 * Check if whole sector is erased
		*/
		if (i != (info->sector_count-1))
			size = info->start[i+1] - info->start[i];
		else
			size = info->start[0] + info->size - info->start[i];
		erased = 1;
		flash = (volatile unsigned long *)info->start[i];
		size = size >> 2;        /* divide by 4 for longword access */
		for (k=0; k<size; k++) {
			if (*flash++ != 0xffffffff) {
				erased = 0;
				break;
			}
		}
		if ((i % 5) == 0)
			printf ("\n   ");
		printf (" %08lX%s%s",
			info->start[i],
			erased ? " E" : "  ",
			info->protect[i] ? "RO " : "   ");
	}
	printf ("\n");
}

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


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

*/

/*
 * The following code cannot be run from FLASH!
 */
static ulong flash_get_size (vu_long *addr, flash_info_t *info)
{
	short i;
	FLASH_WORD_SIZE value;
	ulong base;
	volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)addr;

	/* Write auto select command: read Manufacturer ID */
	addr2[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
	addr2[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
	addr2[ADDR0] = (FLASH_WORD_SIZE)0x00900090;

	value = addr2[0];
	/*	printf("flash_get_size value: %x\n",value); */
	switch (value) {
	case (FLASH_WORD_SIZE)AMD_MANUFACT:
		info->flash_id = FLASH_MAN_AMD;
		break;
	case (FLASH_WORD_SIZE)FUJ_MANUFACT:
		info->flash_id = FLASH_MAN_FUJ;
		break;
	case (FLASH_WORD_SIZE)INTEL_MANUFACT:
		info->flash_id = FLASH_MAN_INTEL;
		break;
	case (FLASH_WORD_SIZE)SST_MANUFACT:
		info->flash_id = FLASH_MAN_SST;
		break;
	default:
		info->flash_id = FLASH_UNKNOWN;
		info->sector_count = 0;
		info->size = 0;
		return (0);			/* no or unknown flash	*/
	}
	value = addr2[1];			/* device ID		*/
	/*	printf("Device value %x\n",value); 		    */
	switch (value) {
	case (FLASH_WORD_SIZE)AMD_ID_F040B:
		info->flash_id += FLASH_AM040;
		info->sector_count = 8;
		info->size = 0x0080000; /* => 512 ko */
		break;
	case (FLASH_WORD_SIZE)AMD_ID_LV400T:
		info->flash_id += FLASH_AM400T;
		info->sector_count = 11;
		info->size = 0x00080000;
		break;				/* => 0.5 MB		*/

	case (FLASH_WORD_SIZE)AMD_ID_LV400B:
		info->flash_id += FLASH_AM400B;
		info->sector_count = 11;
		info->size = 0x00080000;
		break;				/* => 0.5 MB		*/

	case (FLASH_WORD_SIZE)AMD_ID_LV800T:
		info->flash_id += FLASH_AM800T;
		info->sector_count = 19;
		info->size = 0x00100000;
		break;				/* => 1 MB		*/

	case (FLASH_WORD_SIZE)AMD_ID_LV800B:
		info->flash_id += FLASH_AM800B;
		info->sector_count = 19;
		info->size = 0x00100000;
		break;				/* => 1 MB		*/

	case (FLASH_WORD_SIZE)AMD_ID_LV160T:
		info->flash_id += FLASH_AM160T;
		info->sector_count = 35;
		info->size = 0x00200000;
		break;				/* => 2 MB		*/

	case (FLASH_WORD_SIZE)AMD_ID_LV160B:
		info->flash_id += FLASH_AM160B;
		info->sector_count = 35;
		info->size = 0x00200000;
		break;				/* => 2 MB		*/