2 * NAND boot for Freescale Enhanced Local Bus Controller, Flash Control Machine
4 * (C) Copyright 2006-2008
7 * Copyright (c) 2008 Freescale Semiconductor, Inc.
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
28 #include <asm/fsl_lbc.h>
29 #include <linux/mtd/nand.h>
31 #define WINDOW_SIZE 8192
33 static void nand_wait(void)
35 fsl_lbc_t *regs = LBC_BASE_ADDR;
38 uint32_t status = in_be32(®s->ltesr);
44 puts("read failed (ltesr)\n");
50 static void nand_load(unsigned int offs, int uboot_size, uchar *dst)
52 fsl_lbc_t *regs = LBC_BASE_ADDR;
53 uchar *buf = (uchar *)CONFIG_SYS_NAND_BASE;
54 const int large = CONFIG_SYS_NAND_OR_PRELIM & OR_FCM_PGS;
55 const int block_shift = large ? 17 : 14;
56 const int block_size = 1 << block_shift;
57 const int page_size = large ? 2048 : 512;
58 const int bad_marker = large ? page_size + 0 : page_size + 5;
59 int fmr = (15 << FMR_CWTO_SHIFT) | (2 << FMR_AL_SHIFT) | 2;
62 if (offs & (block_size - 1)) {
69 __raw_writel((NAND_CMD_READ0 << FCR_CMD0_SHIFT) |
70 (NAND_CMD_READSTART << FCR_CMD1_SHIFT),
73 (FIR_OP_CW0 << FIR_OP0_SHIFT) |
74 (FIR_OP_CA << FIR_OP1_SHIFT) |
75 (FIR_OP_PA << FIR_OP2_SHIFT) |
76 (FIR_OP_CW1 << FIR_OP3_SHIFT) |
77 (FIR_OP_RBW << FIR_OP4_SHIFT),
80 __raw_writel(NAND_CMD_READ0 << FCR_CMD0_SHIFT, ®s->fcr);
82 (FIR_OP_CW0 << FIR_OP0_SHIFT) |
83 (FIR_OP_CA << FIR_OP1_SHIFT) |
84 (FIR_OP_PA << FIR_OP2_SHIFT) |
85 (FIR_OP_RBW << FIR_OP3_SHIFT),
89 __raw_writel(0, ®s->fbcr);
91 while (pos < uboot_size) {
93 __raw_writel(offs >> block_shift, ®s->fbar);
97 unsigned int page_offs = (offs & (block_size - 1)) << 1;
99 __raw_writel(~0, ®s->ltesr);
100 __raw_writel(0, ®s->lteatr);
101 __raw_writel(page_offs, ®s->fpar);
102 __raw_writel(fmr, ®s->fmr);
104 __raw_writel(0, ®s->lsor);
107 page_offs %= WINDOW_SIZE;
110 * If either of the first two pages are marked bad,
111 * continue to the next block.
113 if (i++ < 2 && buf[page_offs + bad_marker] != 0xff) {
115 offs = (offs + block_size) & ~(block_size - 1);
116 pos &= ~(block_size - 1);
120 for (j = 0; j < page_size; j++)
121 dst[pos + j] = buf[page_offs + j];
125 } while ((offs & (block_size - 1)) && (pos < uboot_size));
130 * The main entry for NAND booting. It's necessary that SDRAM is already
131 * configured and available since this code loads the main U-Boot image
132 * from NAND into SDRAM and starts it from there.
136 __attribute__((noreturn)) void (*uboot)(void);
139 * Load U-Boot image from NAND into RAM
141 nand_load(CONFIG_SYS_NAND_U_BOOT_OFFS, CONFIG_SYS_NAND_U_BOOT_SIZE,
142 (uchar *)CONFIG_SYS_NAND_U_BOOT_DST);
145 * Jump to U-Boot image
147 puts("transfering control\n");
149 * Clean d-cache and invalidate i-cache, to
150 * make sure that no stale data is executed.
152 flush_cache(CONFIG_SYS_NAND_U_BOOT_DST, CONFIG_SYS_NAND_U_BOOT_SIZE);
153 uboot = (void *)CONFIG_SYS_NAND_U_BOOT_START;