nand_spl/nand_boot_fsl_elbc.c

   1 /*
   2  * NAND boot for Freescale Enhanced Local Bus Controller, Flash Control Machine
   3  *
   4  * (C) Copyright 2006-2008
   5  * Stefan Roese, DENX Software Engineering, sr@denx.de.
   6  *
   7  * Copyright (c) 2008 Freescale Semiconductor, Inc.
   8  * Author: Scott Wood <scottwood@freescale.com>
   9  *
  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.
  14  *
  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.
  19  *
  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,
  23  * MA 02111-1307 USA
  24  */
  25
  26 #include <common.h>
  27 #include <asm/io.h>
  28 #include <asm/immap_83xx.h>
  29 #include <asm/fsl_lbc.h>
  30 #include <linux/mtd/nand.h>
  31
  32 #define WINDOW_SIZE 8192
  33
  34 static void nand_wait(void)
  35 {
  36         fsl_lbus_t *regs = (fsl_lbus_t *)(CONFIG_SYS_IMMR + 0x5000);
  37
  38         for (;;) {
  39                 uint32_t status = in_be32(&regs->ltesr);
  40
  41                 if (status == 1)
  42                         return;
  43
  44                 if (status & 1) {
  45                         puts("read failed (ltesr)\n");
  46                         for (;;);
  47                 }
  48         }
  49 }
  50
  51 static void nand_load(unsigned int offs, int uboot_size, uchar *dst)
  52 {
  53         fsl_lbus_t *regs = (fsl_lbus_t *)(CONFIG_SYS_IMMR + 0x5000);
  54         uchar *buf = (uchar *)CONFIG_SYS_NAND_BASE;
  55         int large = in_be32(&regs->bank[0].or) & OR_FCM_PGS;
  56         int block_shift = large ? 17 : 14;
  57         int block_size = 1 << block_shift;
  58         int page_size = large ? 2048 : 512;
  59         int bad_marker = large ? page_size + 0 : page_size + 5;
  60         int fmr = (15 << FMR_CWTO_SHIFT) | (2 << FMR_AL_SHIFT) | 2;
  61         int pos = 0;
  62
  63         if (offs & (block_size - 1)) {
  64                 puts("bad offset\n");
  65                 for (;;);
  66         }
  67
  68         if (large) {
  69                 fmr |= FMR_ECCM;
  70                 out_be32(&regs->fcr, (NAND_CMD_READ0 << FCR_CMD0_SHIFT) |
  71                                      (NAND_CMD_READSTART << FCR_CMD1_SHIFT));
  72                 out_be32(&regs->fir,
  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));
  78         } else {
  79                 out_be32(&regs->fcr, NAND_CMD_READ0 << FCR_CMD0_SHIFT);
  80                 out_be32(&regs->fir,
  81                          (FIR_OP_CW0 << FIR_OP0_SHIFT) |
  82                          (FIR_OP_CA  << FIR_OP1_SHIFT) |
  83                          (FIR_OP_PA  << FIR_OP2_SHIFT) |
  84                          (FIR_OP_RBW << FIR_OP3_SHIFT));
  85         }
  86
  87         out_be32(&regs->fbcr, 0);
  88         clrsetbits_be32(&regs->bank[0].br, BR_DECC, BR_DECC_CHK_GEN);
  89
  90         while (pos < uboot_size) {
  91                 int i = 0;
  92                 out_be32(&regs->fbar, offs >> block_shift);
  93
  94                 do {
  95                         int j;
  96                         unsigned int page_offs = (offs & (block_size - 1)) << 1;
  97
  98                         out_be32(&regs->ltesr, ~0);
  99                         out_be32(&regs->lteatr, 0);
 100                         out_be32(&regs->fpar, page_offs);
 101                         out_be32(&regs->fmr, fmr);
 102                         out_be32(&regs->lsor, 0);
 103                         nand_wait();
 104
 105                         page_offs %= WINDOW_SIZE;
 106
 107                         /*
 108                          * If either of the first two pages are marked bad,
 109                          * continue to the next block.
 110                          */
 111                         if (i++ < 2 && buf[page_offs + bad_marker] != 0xff) {
 112                                 puts("skipping\n");
 113                                 offs = (offs + block_size) & ~(block_size - 1);
 114                                 pos &= ~(block_size - 1);
 115                                 break;
 116                         }
 117
 118                         for (j = 0; j < page_size; j++)
 119                                 dst[pos + j] = buf[page_offs + j];
 120
 121                         pos += page_size;
 122                         offs += page_size;
 123                 } while (offs & (block_size - 1));
 124         }
 125 }
 126
 127 /*
 128  * The main entry for NAND booting. It's necessary that SDRAM is already
 129  * configured and available since this code loads the main U-Boot image
 130  * from NAND into SDRAM and starts it from there.
 131  */
 132 void nand_boot(void)
 133 {
 134         __attribute__((noreturn)) void (*uboot)(void);
 135
 136         /*
 137          * Load U-Boot image from NAND into RAM
 138          */
 139         nand_load(CONFIG_SYS_NAND_U_BOOT_OFFS, CONFIG_SYS_NAND_U_BOOT_SIZE,
 140                   (uchar *)CONFIG_SYS_NAND_U_BOOT_DST);
 141
 142         /*
 143          * Jump to U-Boot image
 144          */
 145         puts("transfering control\n");
 146         /*
 147          * Clean d-cache and invalidate i-cache, to
 148          * make sure that no stale data is executed.
 149          */
 150         flush_cache(CONFIG_SYS_NAND_U_BOOT_DST, CONFIG_SYS_NAND_U_BOOT_SIZE);
 151         uboot = (void *)CONFIG_SYS_NAND_U_BOOT_START;
 152         uboot();
 153 }