drivers/mtd/nand/fsl_ifc_spl.c

   1 /*
   2  * NAND boot for Freescale Integrated Flash Controller, NAND FCM
   3  *
   4  * Copyright 2011 Freescale Semiconductor, Inc.
   5  * Author: Dipen Dudhat <dipen.dudhat@freescale.com>
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <common.h>
  11 #include <asm/io.h>
  12 #include <fsl_ifc.h>
  13 #include <linux/mtd/nand.h>
  14
  15 static inline int is_blank(uchar *addr, int page_size)
  16 {
  17         int i;
  18
  19         for (i = 0; i < page_size; i++) {
  20                 if (__raw_readb(&addr[i]) != 0xff)
  21                         return 0;
  22         }
  23
  24         /*
  25          * For the SPL, don't worry about uncorrectable errors
  26          * where the main area is all FFs but shouldn't be.
  27          */
  28         return 1;
  29 }
  30
  31 /* returns nonzero if entire page is blank */
  32 static inline int check_read_ecc(uchar *buf, u32 *eccstat,
  33                                  unsigned int bufnum, int page_size)
  34 {
  35         u32 reg = eccstat[bufnum / 4];
  36         int errors = (reg >> ((3 - bufnum % 4) * 8)) & 0xf;
  37
  38         if (errors == 0xf) { /* uncorrectable */
  39                 /* Blank pages fail hw ECC checks */
  40                 if (is_blank(buf, page_size))
  41                         return 1;
  42
  43                 puts("ecc error\n");
  44                 for (;;)
  45                         ;
  46         }
  47
  48         return 0;
  49 }
  50
  51 static inline void nand_wait(uchar *buf, int bufnum, int page_size)
  52 {
  53         struct fsl_ifc *ifc = IFC_BASE_ADDR;
  54         u32 status;
  55         u32 eccstat[4];
  56         int bufperpage = page_size / 512;
  57         int bufnum_end, i;
  58
  59         bufnum *= bufperpage;
  60         bufnum_end = bufnum + bufperpage - 1;
  61
  62         do {
  63                 status = in_be32(&ifc->ifc_nand.nand_evter_stat);
  64         } while (!(status & IFC_NAND_EVTER_STAT_OPC));
  65
  66         if (status & IFC_NAND_EVTER_STAT_FTOER) {
  67                 puts("flash time out error\n");
  68                 for (;;)
  69                         ;
  70         }
  71
  72         for (i = bufnum / 4; i <= bufnum_end / 4; i++)
  73                 eccstat[i] = in_be32(&ifc->ifc_nand.nand_eccstat[i]);
  74
  75         for (i = bufnum; i <= bufnum_end; i++) {
  76                 if (check_read_ecc(buf, eccstat, i, page_size))
  77                         break;
  78         }
  79
  80         out_be32(&ifc->ifc_nand.nand_evter_stat, status);
  81 }
  82
  83 static inline int bad_block(uchar *marker, int port_size)
  84 {
  85         if (port_size == 8)
  86                 return __raw_readb(marker) != 0xff;
  87         else
  88                 return __raw_readw((u16 *)marker) != 0xffff;
  89 }
  90
  91 static void nand_load(unsigned int offs, int uboot_size, uchar *dst)
  92 {
  93         struct fsl_ifc *ifc = IFC_BASE_ADDR;
  94         uchar *buf = (uchar *)CONFIG_SYS_NAND_BASE;
  95         int page_size;
  96         int port_size;
  97         int pages_per_blk;
  98         int blk_size;
  99         int bad_marker = 0;
 100         int bufnum_mask, bufnum;
 101
 102         int csor, cspr;
 103         int pos = 0;
 104         int j = 0;
 105
 106         int sram_addr;
 107         int pg_no;
 108
 109         /* Get NAND Flash configuration */
 110         csor = CONFIG_SYS_NAND_CSOR;
 111         cspr = CONFIG_SYS_NAND_CSPR;
 112
 113         port_size = (cspr & CSPR_PORT_SIZE_16) ? 16 : 8;
 114
 115         if ((csor & CSOR_NAND_PGS_MASK) == CSOR_NAND_PGS_8K) {
 116                 page_size = 8192;
 117                 bufnum_mask = 0x0;
 118         } else if ((csor & CSOR_NAND_PGS_MASK) == CSOR_NAND_PGS_4K) {
 119                 page_size = 4096;
 120                 bufnum_mask = 0x1;
 121         } else if ((csor & CSOR_NAND_PGS_MASK) == CSOR_NAND_PGS_2K) {
 122                 page_size = 2048;
 123                 bufnum_mask = 0x3;
 124         } else {
 125                 page_size = 512;
 126                 bufnum_mask = 0xf;
 127
 128                 if (port_size == 8)
 129                         bad_marker = 5;
 130         }
 131
 132         pages_per_blk =
 133                 32 << ((csor & CSOR_NAND_PB_MASK) >> CSOR_NAND_PB_SHIFT);
 134
 135         blk_size = pages_per_blk * page_size;
 136
 137         /* Open Full SRAM mapping for spare are access */
 138         out_be32(&ifc->ifc_nand.ncfgr, 0x0);
 139
 140         /* Clear Boot events */
 141         out_be32(&ifc->ifc_nand.nand_evter_stat, 0xffffffff);
 142
 143         /* Program FIR/FCR for Large/Small page */
 144         if (page_size > 512) {
 145                 out_be32(&ifc->ifc_nand.nand_fir0,
 146                          (IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
 147                          (IFC_FIR_OP_CA0 << IFC_NAND_FIR0_OP1_SHIFT) |
 148                          (IFC_FIR_OP_RA0 << IFC_NAND_FIR0_OP2_SHIFT) |
 149                          (IFC_FIR_OP_CMD1 << IFC_NAND_FIR0_OP3_SHIFT) |
 150                          (IFC_FIR_OP_BTRD << IFC_NAND_FIR0_OP4_SHIFT));
 151                 out_be32(&ifc->ifc_nand.nand_fir1, 0x0);
 152
 153                 out_be32(&ifc->ifc_nand.nand_fcr0,
 154                          (NAND_CMD_READ0 << IFC_NAND_FCR0_CMD0_SHIFT) |
 155                          (NAND_CMD_READSTART << IFC_NAND_FCR0_CMD1_SHIFT));
 156         } else {
 157                 out_be32(&ifc->ifc_nand.nand_fir0,
 158                          (IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
 159                          (IFC_FIR_OP_CA0 << IFC_NAND_FIR0_OP1_SHIFT) |
 160                          (IFC_FIR_OP_RA0  << IFC_NAND_FIR0_OP2_SHIFT) |
 161                          (IFC_FIR_OP_BTRD << IFC_NAND_FIR0_OP3_SHIFT));
 162                 out_be32(&ifc->ifc_nand.nand_fir1, 0x0);
 163
 164                 out_be32(&ifc->ifc_nand.nand_fcr0,
 165                          NAND_CMD_READ0 << IFC_NAND_FCR0_CMD0_SHIFT);
 166         }
 167
 168         /* Program FBCR = 0 for full page read */
 169         out_be32(&ifc->ifc_nand.nand_fbcr, 0);
 170
 171         /* Read and copy u-boot on SDRAM from NAND device, In parallel
 172          * check for Bad block if found skip it and read continue to
 173          * next Block
 174          */
 175         while (pos < uboot_size) {
 176                 int i = 0;
 177                 do {
 178                         pg_no = offs / page_size;
 179                         bufnum = pg_no & bufnum_mask;
 180                         sram_addr = bufnum * page_size * 2;
 181
 182                         out_be32(&ifc->ifc_nand.row0, pg_no);
 183                         out_be32(&ifc->ifc_nand.col0, 0);
 184                         /* start read */
 185                         out_be32(&ifc->ifc_nand.nandseq_strt,
 186                                  IFC_NAND_SEQ_STRT_FIR_STRT);
 187
 188                         /* wait for read to complete */
 189                         nand_wait(&buf[sram_addr], bufnum, page_size);
 190
 191                         /*
 192                          * If either of the first two pages are marked bad,
 193                          * continue to the next block.
 194                          */
 195                         if (i++ < 2 &&
 196                             bad_block(&buf[sram_addr + page_size + bad_marker],
 197                                       port_size)) {
 198                                 puts("skipping\n");
 199                                 offs = (offs + blk_size) & ~(blk_size - 1);
 200                                 pos &= ~(blk_size - 1);
 201                                 break;
 202                         }
 203
 204                         for (j = 0; j < page_size; j++)
 205                                 dst[pos + j] = __raw_readb(&buf[sram_addr + j]);
 206
 207                         pos += page_size;
 208                         offs += page_size;
 209                 } while ((offs & (blk_size - 1)) && (pos < uboot_size));
 210         }
 211 }
 212
 213 /*
 214  * Main entrypoint for NAND Boot. It's necessary that SDRAM is already
 215  * configured and available since this code loads the main U-boot image
 216  * from NAND into SDRAM and starts from there.
 217  */
 218 void nand_boot(void)
 219 {
 220         __attribute__((noreturn)) void (*uboot)(void);
 221         /*
 222          * Load U-Boot image from NAND into RAM
 223          */
 224         nand_load(CONFIG_SYS_NAND_U_BOOT_OFFS, CONFIG_SYS_NAND_U_BOOT_SIZE,
 225                   (uchar *)CONFIG_SYS_NAND_U_BOOT_DST);
 226
 227 #ifdef CONFIG_NAND_ENV_DST
 228         nand_load(CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE,
 229                   (uchar *)CONFIG_NAND_ENV_DST);
 230
 231 #ifdef CONFIG_ENV_OFFSET_REDUND
 232         nand_load(CONFIG_ENV_OFFSET_REDUND, CONFIG_ENV_SIZE,
 233                   (uchar *)CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE);
 234 #endif
 235 #endif
 236         /*
 237          * Jump to U-Boot image
 238          */
 239 #ifdef CONFIG_SPL_FLUSH_IMAGE
 240         /*
 241          * Clean d-cache and invalidate i-cache, to
 242          * make sure that no stale data is executed.
 243          */
 244         flush_cache(CONFIG_SYS_NAND_U_BOOT_DST, CONFIG_SYS_NAND_U_BOOT_SIZE);
 245 #endif
 246         uboot = (void *)CONFIG_SYS_NAND_U_BOOT_START;
 247         uboot();
 248 }