drivers/mtd/nand/fsl_elbc_spl.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  * SPDX-License-Identifier:     GPL-2.0+
  11  */
  12
  13 #include <common.h>
  14 #include <asm/io.h>
  15 #include <asm/fsl_lbc.h>
  16 #include <nand.h>
  17
  18 #define WINDOW_SIZE 8192
  19
  20 static void nand_wait(void)
  21 {
  22         fsl_lbc_t *regs = LBC_BASE_ADDR;
  23
  24         for (;;) {
  25                 uint32_t status = in_be32(&regs->ltesr);
  26
  27                 if (status == 1)
  28                         return;
  29
  30                 if (status & 1) {
  31                         puts("read failed (ltesr)\n");
  32                         for (;;);
  33                 }
  34         }
  35 }
  36
  37 static int nand_load_image(uint32_t offs, unsigned int uboot_size, void *vdst)
  38 {
  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;
  47         int pos = 0;
  48         char *dst = vdst;
  49
  50         if (offs & (block_size - 1)) {
  51                 puts("bad offset\n");
  52                 for (;;);
  53         }
  54
  55         if (large) {
  56                 fmr |= FMR_ECCM;
  57                 out_be32(&regs->fcr, (NAND_CMD_READ0 << FCR_CMD0_SHIFT) |
  58                                      (NAND_CMD_READSTART << FCR_CMD1_SHIFT));
  59                 out_be32(&regs->fir,
  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));
  65         } else {
  66                 out_be32(&regs->fcr, NAND_CMD_READ0 << FCR_CMD0_SHIFT);
  67                 out_be32(&regs->fir,
  68                          (FIR_OP_CW0 << FIR_OP0_SHIFT) |
  69                          (FIR_OP_CA  << FIR_OP1_SHIFT) |
  70                          (FIR_OP_PA  << FIR_OP2_SHIFT) |
  71                          (FIR_OP_RBW << FIR_OP3_SHIFT));
  72         }
  73
  74         out_be32(&regs->fbcr, 0);
  75         clrsetbits_be32(&regs->bank[0].br, BR_DECC, BR_DECC_CHK_GEN);
  76
  77         while (pos < uboot_size) {
  78                 int i = 0;
  79                 out_be32(&regs->fbar, offs >> block_shift);
  80
  81                 do {
  82                         int j;
  83                         unsigned int page_offs = (offs & (block_size - 1)) << 1;
  84
  85                         out_be32(&regs->ltesr, ~0);
  86                         out_be32(&regs->lteatr, 0);
  87                         out_be32(&regs->fpar, page_offs);
  88                         out_be32(&regs->fmr, fmr);
  89                         out_be32(&regs->lsor, 0);
  90                         nand_wait();
  91
  92                         page_offs %= WINDOW_SIZE;
  93
  94                         /*
  95                          * If either of the first two pages are marked bad,
  96                          * continue to the next block.
  97                          */
  98                         if (i++ < 2 && buf[page_offs + bad_marker] != 0xff) {
  99                                 puts("skipping\n");
 100                                 offs = (offs + block_size) & ~(block_size - 1);
 101                                 pos &= ~(block_size - 1);
 102                                 break;
 103                         }
 104
 105                         for (j = 0; j < page_size; j++)
 106                                 dst[pos + j] = buf[page_offs + j];
 107
 108                         pos += page_size;
 109                         offs += page_size;
 110                 } while ((offs & (block_size - 1)) && (pos < uboot_size));
 111         }
 112
 113         return 0;
 114 }
 115
 116 /*
 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.
 120  */
 121 void nand_boot(void)
 122 {
 123         __attribute__((noreturn)) void (*uboot)(void);
 124         /*
 125          * Load U-Boot image from NAND into RAM
 126          */
 127         nand_load_image(CONFIG_SYS_NAND_U_BOOT_OFFS,
 128                         CONFIG_SYS_NAND_U_BOOT_SIZE,
 129                         (void *)CONFIG_SYS_NAND_U_BOOT_DST);
 130
 131 #ifdef CONFIG_NAND_ENV_DST
 132         nand_load_image(CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE,
 133                         (void *)CONFIG_NAND_ENV_DST);
 134
 135 #ifdef CONFIG_ENV_OFFSET_REDUND
 136         nand_load_image(CONFIG_ENV_OFFSET_REDUND, CONFIG_ENV_SIZE,
 137                         (void *)CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE);
 138 #endif
 139 #endif
 140
 141 #ifdef CONFIG_SPL_FLUSH_IMAGE
 142         /*
 143          * Clean d-cache and invalidate i-cache, to
 144          * make sure that no stale data is executed.
 145          */
 146         flush_cache(CONFIG_SYS_NAND_U_BOOT_DST, CONFIG_SYS_NAND_U_BOOT_SIZE);
 147 #endif
 148
 149         puts("transfering control\n");
 150         /*
 151          * Jump to U-Boot image
 152          */
 153         uboot = (void *)CONFIG_SYS_NAND_U_BOOT_START;
 154         (*uboot)();
 155 }