boot/common/src/loader/drivers/bbt.c

/*
 * (C) Copyright 2016 ZXIC Inc.
 */
   

#include <common.h>
#include <asm/io.h>
#include <bbt.h>
#include "config.h"
#include "flash.h"


static uint8_t block_bad_table[BBT_SIZE]={0};


static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' };
static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' };

static struct nand_bbt_descr bbt_main_descr = {
	.offs =	4,
	.len = 4,
	.veroffs = 20,
	.maxblocks = 16,
	.pattern = bbt_pattern,
};

static struct nand_bbt_descr bbt_mirror_descr = {
	.offs =	4,
	.len = 4,
	.veroffs = 20,
	.maxblocks = 16,
	.pattern = mirror_pattern,
};

static int nand_check_pattern(uint8_t *buf,struct nand_bbt_descr *td)
{
	int i;
	uint8_t *p = buf;
	p += td->offs;

	/* Compare the pattern */
	for (i = 0; i < td->len; i++) 
    {
		if (p[i] != td->pattern[i])
			return -1;
	}
	
	return 0;
}

void nand_creat_ram_bbt( void )
{
	uint32_t i = 0;
	uint32_t off = 0;
	uint32_t oob_size = flash.oob_size;
	uint32_t block_size = flash.block_size;
	uint8_t oob[256];   /* ÕâÀﶨÒå×î´óµÄOOB SIZE */
#ifdef CONFIG_ZX297520V3E_MDL_AB
	uint32_t block_nums = 72;
#else
	uint32_t block_nums = 17;
#endif

	for( i=0; i<block_nums; i++ )
	{
		flash.read_oob(&oob[0], off, oob_size);
		if(oob[0] != 0xff)                      /* bad block */
			block_bad_table[i] = BAD_BLOCK;
		else 
			block_bad_table[i] = 0x0;

		off += block_size;
	}
}


int nand_search_bbt(struct nand_bbt_descr *td)
{

	int  startblock, block;
	int blocktopage = flash.block_size_shift - flash.page_size_shift;
	
	uint8_t oob_buffer[256]={0xFF};
    uint32_t offs = 0;

	/* Search direction down -> top */
	 startblock = flash.block_num -1;
	
	td->page= -1;
	/* Scan the maximum number of blocks */
	for (block = 0; block < td->maxblocks; block++) 
    {

		int actblock = startblock -block;
		offs = actblock << flash.block_size_shift;

		/* Read first page */
		flash.read_oob(oob_buffer, offs, flash.oob_size);
		if (!nand_check_pattern(oob_buffer,td)) 
        {
			td->page = actblock << blocktopage;
			td->version= oob_buffer[td->veroffs];
			
			break;
		}
	}
	
	return 0;
}


static int nand_read_bbt(struct nand_bbt_descr  *td,int num)
{
	int bits=2;
	
	int res, i, j, act = 0;
	int totlen;
	int from;
	uint8_t msk = (uint8_t) ((1 << bits) - 1);
	totlen = (num * bits) >> 3;
    from =(td->page)<<(flash.page_size_shift);
	char* buf;
	

	res = flash.read_page_raw(CFG_TEMP_ADDR, from);
	if (res < 0) 
    {
		return -1;
	}
	
	buf =(char*) CFG_TEMP_ADDR;
	

	/* Analyse data */
	for (i = 0; i < totlen; i++) 
    {
		uint8_t dat = buf[i];
		for (j = 0; j < 8; j += bits, act += 2) 
        {
			uint8_t tmp = (dat >> j) & msk;
			if (tmp == msk)
			{
			    block_bad_table[(act >> 1)]= 0X0;
				continue;
			}
			else
			{
				block_bad_table[(act >> 1)]= BAD_BLOCK;
			}
	    }  
     }
	
	  return 0;
}


static void nand_init_bbt_descr(struct nand_bbt_descr *td, 
        					    	 struct nand_bbt_descr *md)
{
	switch(flash.manuf_id)
	{
		case NAND_MFR_PARAGON:
			if(flash.device_id != NAND_DEVID_FDANWEI_1G)
			{
				td->offs = BBT_INFO_OOB_OFFSET_PARAGON;
				md->offs = BBT_INFO_OOB_OFFSET_PARAGON;
				td->veroffs = BBT_INFO_OOB_VER_OFFSET_PARAGON;
				md->veroffs = BBT_INFO_OOB_VER_OFFSET_PARAGON;
			}
			break;
		case NAND_MFR_HEYANGTEK:
			td->offs = BBT_INFO_OOB_OFFSET_HEYANGTEK;
			md->offs = BBT_INFO_OOB_OFFSET_HEYANGTEK;
			td->veroffs = BBT_INFO_OOB_VER_OFFSET_HEYANGTEK; 	
			md->veroffs =BBT_INFO_OOB_VER_OFFSET_HEYANGTEK;
			break;
		default: 
			break;
	}
}

int nand_creat_bbt( void )
{  
    struct nand_bbt_descr *td = &bbt_main_descr;
	struct nand_bbt_descr *md = &bbt_mirror_descr;

	nand_init_bbt_descr(td, md);
	
    // 2.0 search main bbt
	nand_search_bbt(td);
	// 2.1 search mirror bbt
	nand_search_bbt(md);

	if(td->page==-1&&md->page ==-1)
	{
		/* if failed found bbt, we create a ram bbt */
		nand_creat_ram_bbt();
	    return 0;
	}

	// 3.0 read and analyze bbt
	if(td->page==-1)
	{
		nand_read_bbt(md,BBT_SIZE);	
	}
	else
	{
		if(md->page == -1)
		{
			nand_read_bbt(td,BBT_SIZE);	
		}
		else
		{
			if(td->version >= md->version)
			{
				nand_read_bbt(td,BBT_SIZE);	
			}
			else
			{
				nand_read_bbt(md,BBT_SIZE);	
			}
		}
	}
	printf("bbt ok.\n");

	return 0;
}

/*******************************************************************************
 * Function:     
 * Description: 
 * Parameters:
 *	 Input:
 *
 *	 Output:
 *
 * Returns:
 *
 *
 * Others:
 ********************************************************************************/
uint32_t nand_block_isbad(uint32_t offset)
{
    uint32_t block_offset = offset >> (flash.block_size_shift);
    return block_bad_table[block_offset];
}