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 #ifdef CONFIG_TPL_BUILD
  38 int nand_spl_load_image(uint32_t offs, unsigned int uboot_size, void *vdst)
  39 #else
  40 static int nand_load_image(uint32_t offs, unsigned int uboot_size, void *vdst)
  41 #endif
  42 {
  43         fsl_lbc_t *regs = LBC_BASE_ADDR;
  44         uchar *buf = (uchar *)CONFIG_SYS_NAND_BASE;
  45         const int large = CONFIG_SYS_NAND_OR_PRELIM & OR_FCM_PGS;
  46         const int block_shift = large ? 17 : 14;
  47         const int block_size = 1 << block_shift;
  48         const int page_size = large ? 2048 : 512;
  49         const int bad_marker = large ? page_size + 0 : page_size + 5;
  50         int fmr = (15 << FMR_CWTO_SHIFT) | (2 << FMR_AL_SHIFT) | 2;
  51         int pos = 0;
  52         char *dst = vdst;
  53
  54         if (offs & (block_size - 1)) {
  55                 puts("bad offset\n");
  56                 for (;;);
  57         }
  58
  59         if (large) {
  60                 fmr |= FMR_ECCM;
  61                 out_be32(&regs->fcr, (NAND_CMD_READ0 << FCR_CMD0_SHIFT) |
  62                                      (NAND_CMD_READSTART << FCR_CMD1_SHIFT));
  63                 out_be32(&regs->fir,
  64                          (FIR_OP_CW0 << FIR_OP0_SHIFT) |
  65                          (FIR_OP_CA  << FIR_OP1_SHIFT) |
  66                          (FIR_OP_PA  << FIR_OP2_SHIFT) |
  67                          (FIR_OP_CW1 << FIR_OP3_SHIFT) |
  68                          (FIR_OP_RBW << FIR_OP4_SHIFT));
  69         } else {
  70                 out_be32(&regs->fcr, NAND_CMD_READ0 << FCR_CMD0_SHIFT);
  71                 out_be32(&regs->fir,
  72                          (FIR_OP_CW0 << FIR_OP0_SHIFT) |
  73                          (FIR_OP_CA  << FIR_OP1_SHIFT) |
  74                          (FIR_OP_PA  << FIR_OP2_SHIFT) |
  75                          (FIR_OP_RBW << FIR_OP3_SHIFT));
  76         }
  77
  78         out_be32(&regs->fbcr, 0);
  79         clrsetbits_be32(&regs->bank[0].br, BR_DECC, BR_DECC_CHK_GEN);
  80
  81         while (pos < uboot_size) {
  82                 int i = 0;
  83                 out_be32(&regs->fbar, offs >> block_shift);
  84
  85                 do {
  86                         int j;
  87                         unsigned int page_offs = (offs & (block_size - 1)) << 1;
  88
  89                         out_be32(&regs->ltesr, ~0);
  90                         out_be32(&regs->lteatr, 0);
  91                         out_be32(&regs->fpar, page_offs);
  92                         out_be32(&regs->fmr, fmr);
  93                         out_be32(&regs->lsor, 0);
  94                         nand_wait();
  95
  96                         page_offs %= WINDOW_SIZE;
  97
  98                         /*
  99                          * If either of the first two pages are marked bad,
 100                          * continue to the next block.
 101                          */
 102                         if (i++ < 2 && buf[page_offs + bad_marker] != 0xff) {
 103                                 puts("skipping\n");
 104                                 offs = (offs + block_size) & ~(block_size - 1);
 105                                 pos &= ~(block_size - 1);
 106                                 break;
 107                         }
 108
 109                         for (j = 0; j < page_size; j++)
 110                                 dst[pos + j] = buf[page_offs + j];
 111
 112                         pos += page_size;
 113                         offs += page_size;
 114                 } while ((offs & (block_size - 1)) && (pos < uboot_size));
 115         }
 116
 117         return 0;
 118 }
 119
 120 /*
 121  * Defines a static function nand_load_image() here, because non-static makes
 122  * the code too large for certain SPLs(minimal SPL, maximum size <= 4Kbytes)
 123  */
 124 #ifndef CONFIG_TPL_BUILD
 125 #define nand_spl_load_image(offs, uboot_size, vdst) \
 126         nand_load_image(offs, uboot_size, vdst)
 127 #endif
 128
 129 /*
 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.
 133  */
 134 void nand_boot(void)
 135 {
 136         __attribute__((noreturn)) void (*uboot)(void);
 137         /*
 138          * Load U-Boot image from NAND into RAM
 139          */
 140         nand_spl_load_image(CONFIG_SYS_NAND_U_BOOT_OFFS,
 141                             CONFIG_SYS_NAND_U_BOOT_SIZE,
 142                             (void *)CONFIG_SYS_NAND_U_BOOT_DST);
 143
 144 #ifdef CONFIG_NAND_ENV_DST
 145         nand_spl_load_image(CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE,
 146                             (void *)CONFIG_NAND_ENV_DST);
 147
 148 #ifdef CONFIG_ENV_OFFSET_REDUND
 149         nand_spl_load_image(CONFIG_ENV_OFFSET_REDUND, CONFIG_ENV_SIZE,
 150                             (void *)CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE);
 151 #endif
 152 #endif
 153
 154 #ifdef CONFIG_SPL_FLUSH_IMAGE
 155         /*
 156          * Clean d-cache and invalidate i-cache, to
 157          * make sure that no stale data is executed.
 158          */
 159         flush_cache(CONFIG_SYS_NAND_U_BOOT_DST, CONFIG_SYS_NAND_U_BOOT_SIZE);
 160 #endif
 161
 162         puts("transfering control\n");
 163         /*
 164          * Jump to U-Boot image
 165          */
 166         uboot = (void *)CONFIG_SYS_NAND_U_BOOT_START;
 167         (*uboot)();
 168 }