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/*
* NAND boot for Freescale Enhanced Local Bus Controller, Flash Control Machine
*
* (C) Copyright 2006-2008
* Stefan Roese, DENX Software Engineering, sr@denx.de.
*
* Copyright (c) 2008 Freescale Semiconductor, Inc.
* Author: Scott Wood <scottwood@freescale.com>
*
* 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 <common.h>
#include <asm/io.h>
#include <asm/immap_83xx.h>
#include <asm/fsl_lbc.h>
#include <linux/mtd/nand.h>
#define WINDOW_SIZE 8192
static void nand_wait(void)
{
lbus83xx_t *regs = (lbus83xx_t *)(CFG_IMMR + 0x5000);
for (;;) {
uint32_t status = in_be32(®s->ltesr);
if (status == 1)
return;
if (status & 1) {
puts("read failed (ltesr)\n");
for (;;);
}
}
}
static void nand_load(unsigned int offs, int uboot_size, uchar *dst)
{
lbus83xx_t *regs = (lbus83xx_t *)(CFG_IMMR + 0x5000);
uchar *buf = (uchar *)CFG_NAND_BASE;
int large = in_be32(®s->bank[0].or) & OR_FCM_PGS;
int block_shift = large ? 17 : 14;
int block_size = 1 << block_shift;
int page_size = large ? 2048 : 512;
int bad_marker = large ? page_size + 0 : page_size + 5;
int fmr = (15 << FMR_CWTO_SHIFT) | (2 << FMR_AL_SHIFT) | 2;
int pos = 0;
if (offs & (block_size - 1)) {
puts("bad offset\n");
for (;;);
}
if (large) {
fmr |= FMR_ECCM;
out_be32(®s->fcr, (NAND_CMD_READ0 << FCR_CMD0_SHIFT) |
(NAND_CMD_READSTART << FCR_CMD1_SHIFT));
out_be32(®s->fir,
(FIR_OP_CW0 << FIR_OP0_SHIFT) |
(FIR_OP_CA << FIR_OP1_SHIFT) |
(FIR_OP_PA << FIR_OP2_SHIFT) |
(FIR_OP_CW1 << FIR_OP3_SHIFT) |
(FIR_OP_RBW << FIR_OP4_SHIFT));
} else {
out_be32(®s->fcr, NAND_CMD_READ0 << FCR_CMD0_SHIFT);
out_be32(®s->fir,
(FIR_OP_CW0 << FIR_OP0_SHIFT) |
(FIR_OP_CA << FIR_OP1_SHIFT) |
(FIR_OP_PA << FIR_OP2_SHIFT) |
(FIR_OP_RBW << FIR_OP3_SHIFT));
}
out_be32(®s->fbcr, 0);
clrsetbits_be32(®s->bank[0].br, BR_DECC, BR_DECC_CHK_GEN);
while (pos < uboot_size) {
int i = 0;
out_be32(®s->fbar, offs >> block_shift);
do {
int j;
unsigned int page_offs = (offs & (block_size - 1)) << 1;
out_be32(®s->ltesr, ~0);
out_be32(®s->lteatr, 0);
out_be32(®s->fpar, page_offs);
out_be32(®s->fmr, fmr);
out_be32(®s->lsor, 0);
nand_wait();
page_offs %= WINDOW_SIZE;
/*
* If either of the first two pages are marked bad,
* continue to the next block.
*/
if (i++ < 2 && buf[page_offs + bad_marker] != 0xff) {
puts("skipping\n");
offs = (offs + block_size) & ~(block_size - 1);
pos &= ~(block_size - 1);
break;
}
for (j = 0; j < page_size; j++)
dst[pos + j] = buf[page_offs + j];
pos += page_size;
offs += page_size;
} while (offs & (block_size - 1));
}
}
/*
* The main entry for NAND booting. It's necessary that SDRAM is already
* configured and available since this code loads the main U-Boot image
* from NAND into SDRAM and starts it from there.
*/
void nand_boot(void)
{
__attribute__((noreturn)) void (*uboot)(void);
/*
* Load U-Boot image from NAND into RAM
*/
nand_load(CFG_NAND_U_BOOT_OFFS, CFG_NAND_U_BOOT_SIZE,
(uchar *)CFG_NAND_U_BOOT_DST);
/*
* Jump to U-Boot image
*/
puts("transfering control\n");
uboot = (void *)CFG_NAND_U_BOOT_START;
uboot();
}
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