2 * NAND boot for Freescale Enhanced Local Bus Controller, Flash Control Machine
4 * (C) Copyright 2006-2008
5 * Stefan Roese, DENX Software Engineering, sr@denx.de.
7 * Copyright (c) 2008 Freescale Semiconductor, Inc.
8 * Author: Scott Wood <scottwood@freescale.com>
10 * SPDX-License-Identifier: GPL-2.0+
15 #include <asm/fsl_lbc.h>
16 #include <linux/mtd/nand.h>
18 #define WINDOW_SIZE 8192
20 static void nand_wait(void)
22 fsl_lbc_t *regs = LBC_BASE_ADDR;
25 uint32_t status = in_be32(®s->ltesr);
31 puts("read failed (ltesr)\n");
37 static void nand_load(unsigned int offs, int uboot_size, uchar *dst)
39 fsl_lbc_t *regs = LBC_BASE_ADDR;
40 uchar *buf = (uchar *)CONFIG_SYS_NAND_BASE;
41 const int large = CONFIG_SYS_NAND_OR_PRELIM & OR_FCM_PGS;
42 const int block_shift = large ? 17 : 14;
43 const int block_size = 1 << block_shift;
44 const int page_size = large ? 2048 : 512;
45 const int bad_marker = large ? page_size + 0 : page_size + 5;
46 int fmr = (15 << FMR_CWTO_SHIFT) | (2 << FMR_AL_SHIFT) | 2;
49 if (offs & (block_size - 1)) {
56 __raw_writel((NAND_CMD_READ0 << FCR_CMD0_SHIFT) |
57 (NAND_CMD_READSTART << FCR_CMD1_SHIFT),
60 (FIR_OP_CW0 << FIR_OP0_SHIFT) |
61 (FIR_OP_CA << FIR_OP1_SHIFT) |
62 (FIR_OP_PA << FIR_OP2_SHIFT) |
63 (FIR_OP_CW1 << FIR_OP3_SHIFT) |
64 (FIR_OP_RBW << FIR_OP4_SHIFT),
67 __raw_writel(NAND_CMD_READ0 << FCR_CMD0_SHIFT, ®s->fcr);
69 (FIR_OP_CW0 << FIR_OP0_SHIFT) |
70 (FIR_OP_CA << FIR_OP1_SHIFT) |
71 (FIR_OP_PA << FIR_OP2_SHIFT) |
72 (FIR_OP_RBW << FIR_OP3_SHIFT),
76 __raw_writel(0, ®s->fbcr);
78 while (pos < uboot_size) {
80 __raw_writel(offs >> block_shift, ®s->fbar);
84 unsigned int page_offs = (offs & (block_size - 1)) << 1;
86 __raw_writel(~0, ®s->ltesr);
87 __raw_writel(0, ®s->lteatr);
88 __raw_writel(page_offs, ®s->fpar);
89 __raw_writel(fmr, ®s->fmr);
91 __raw_writel(0, ®s->lsor);
94 page_offs %= WINDOW_SIZE;
97 * If either of the first two pages are marked bad,
98 * continue to the next block.
100 if (i++ < 2 && buf[page_offs + bad_marker] != 0xff) {
102 offs = (offs + block_size) & ~(block_size - 1);
103 pos &= ~(block_size - 1);
107 for (j = 0; j < page_size; j++)
108 dst[pos + j] = buf[page_offs + j];
112 } while ((offs & (block_size - 1)) && (pos < uboot_size));
117 * The main entry for NAND booting. It's necessary that SDRAM is already
118 * configured and available since this code loads the main U-Boot image
119 * from NAND into SDRAM and starts it from there.
123 __attribute__((noreturn)) void (*uboot)(void);
126 * Load U-Boot image from NAND into RAM
128 nand_load(CONFIG_SYS_NAND_U_BOOT_OFFS, CONFIG_SYS_NAND_U_BOOT_SIZE,
129 (uchar *)CONFIG_SYS_NAND_U_BOOT_DST);
132 * Jump to U-Boot image
134 puts("transfering control\n");
136 * Clean d-cache and invalidate i-cache, to
137 * make sure that no stale data is executed.
139 flush_cache(CONFIG_SYS_NAND_U_BOOT_DST, CONFIG_SYS_NAND_U_BOOT_SIZE);
140 uboot = (void *)CONFIG_SYS_NAND_U_BOOT_START;