nand_spl/nand_boot_fsl_ifc.c

   1 /*
   2  * NAND boot for FSL Integrated Flash Controller, NAND Flash Control Machine
   3  *
   4  * Copyright 2011 Freescale Semiconductor, Inc.
   5  * Author: Dipen Dudhat <dipen.dudhat@freescale.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of
  10  * the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  20  * MA 02111-1307 USA
  21  */
  22
  23 #include <common.h>
  24 #include <asm/io.h>
  25 #include <asm/fsl_ifc.h>
  26 #include <linux/mtd/nand.h>
  27
  28 static inline int is_blank(uchar *addr, int page_size)
  29 {
  30         int i;
  31
  32         for (i = 0; i < page_size; i++) {
  33                 if (__raw_readb(&addr[i]) != 0xff)
  34                         return 0;
  35         }
  36
  37         /*
  38          * For the SPL, don't worry about uncorrectable errors
  39          * where the main area is all FFs but shouldn't be.
  40          */
  41         return 1;
  42 }
  43
  44 /* returns nonzero if entire page is blank */
  45 static inline int check_read_ecc(uchar *buf, u32 *eccstat,
  46                                  unsigned int bufnum, int page_size)
  47 {
  48         u32 reg = eccstat[bufnum / 4];
  49         int errors = (reg >> ((3 - bufnum % 4) * 8)) & 15;
  50
  51         if (errors == 15) { /* uncorrectable */
  52                 /* Blank pages fail hw ECC checks */
  53                 if (is_blank(buf, page_size))
  54                         return 1;
  55
  56                 puts("ecc error\n");
  57                 for (;;)
  58                         ;
  59         }
  60
  61         return 0;
  62 }
  63
  64 static inline void nand_wait(uchar *buf, int bufnum, int page_size)
  65 {
  66         struct fsl_ifc *ifc = IFC_BASE_ADDR;
  67         u32 status;
  68         u32 eccstat[4];
  69         int bufperpage = page_size / 512;
  70         int bufnum_end, i;
  71
  72         bufnum *= bufperpage;
  73         bufnum_end = bufnum + bufperpage - 1;
  74
  75         do {
  76                 status = in_be32(&ifc->ifc_nand.nand_evter_stat);
  77         } while (!(status & IFC_NAND_EVTER_STAT_OPC));
  78
  79         if (status & IFC_NAND_EVTER_STAT_FTOER) {
  80                 puts("flash time out error\n");
  81                 for (;;)
  82                         ;
  83         }
  84
  85         for (i = bufnum / 4; i <= bufnum_end / 4; i++)
  86                 eccstat[i] = in_be32(&ifc->ifc_nand.nand_eccstat[i]);
  87
  88         for (i = bufnum; i <= bufnum_end; i++) {
  89                 if (check_read_ecc(buf, eccstat, i, page_size))
  90                         break;
  91         }
  92
  93         out_be32(&ifc->ifc_nand.nand_evter_stat, status);
  94 }
  95
  96 static inline int bad_block(uchar *marker, int port_size)
  97 {
  98         if (port_size == 8)
  99                 return __raw_readb(marker) != 0xff;
 100         else
 101                 return __raw_readw((u16 *)marker) != 0xffff;
 102 }
 103
 104 static void nand_load(unsigned int offs, int uboot_size, uchar *dst)
 105 {
 106         struct fsl_ifc *ifc = IFC_BASE_ADDR;
 107         uchar *buf = (uchar *)CONFIG_SYS_NAND_BASE;
 108         int page_size;
 109         int port_size;
 110         int pages_per_blk;
 111         int blk_size;
 112         int bad_marker = 0;
 113         int bufnum_mask, bufnum;
 114
 115         int csor, cspr;
 116         int pos = 0;
 117         int j = 0;
 118
 119         int sram_addr;
 120         int pg_no;
 121
 122         /* Get NAND Flash configuration */
 123         csor = CONFIG_SYS_NAND_CSOR;
 124         cspr = CONFIG_SYS_NAND_CSPR;
 125
 126         if (!(csor & CSOR_NAND_ECC_DEC_EN)) {
 127                 /* soft ECC in SPL is unimplemented */
 128                 puts("WARNING: soft ECC not checked in SPL\n");
 129         } else {
 130                 u32 hwcsor;
 131
 132                 /* make sure board is configured with ECC on boot */
 133                 hwcsor = in_be32(&ifc->csor_cs[0].csor);
 134                 if (!(hwcsor & CSOR_NAND_ECC_DEC_EN))
 135                         puts("WARNING: ECC not checked in SPL, "
 136                                 "check board cfg\n");
 137         }
 138
 139         port_size = (cspr & CSPR_PORT_SIZE_16) ? 16 : 8;
 140
 141         if (csor & CSOR_NAND_PGS_4K) {
 142                 page_size = 4096;
 143                 bufnum_mask = 1;
 144         } else if (csor & CSOR_NAND_PGS_2K) {
 145                 page_size = 2048;
 146                 bufnum_mask = 3;
 147         } else {
 148                 page_size = 512;
 149                 bufnum_mask = 15;
 150
 151                 if (port_size == 8)
 152                         bad_marker = 5;
 153         }
 154
 155         pages_per_blk =
 156                 32 << ((csor & CSOR_NAND_PB_MASK) >> CSOR_NAND_PB_SHIFT);
 157
 158         blk_size = pages_per_blk * page_size;
 159
 160         /* Open Full SRAM mapping for spare are access */
 161         out_be32(&ifc->ifc_nand.ncfgr, 0x0);
 162
 163         /* Clear Boot events */
 164         out_be32(&ifc->ifc_nand.nand_evter_stat, 0xffffffff);
 165
 166         /* Program FIR/FCR for Large/Small page */
 167         if (page_size > 512) {
 168                 out_be32(&ifc->ifc_nand.nand_fir0,
 169                          (IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
 170                          (IFC_FIR_OP_CA0 << IFC_NAND_FIR0_OP1_SHIFT) |
 171                          (IFC_FIR_OP_RA0 << IFC_NAND_FIR0_OP2_SHIFT) |
 172                          (IFC_FIR_OP_CMD1 << IFC_NAND_FIR0_OP3_SHIFT) |
 173                          (IFC_FIR_OP_BTRD << IFC_NAND_FIR0_OP4_SHIFT));
 174                 out_be32(&ifc->ifc_nand.nand_fir1, 0x0);
 175
 176                 out_be32(&ifc->ifc_nand.nand_fcr0,
 177                         (NAND_CMD_READ0 << IFC_NAND_FCR0_CMD0_SHIFT) |
 178                         (NAND_CMD_READSTART << IFC_NAND_FCR0_CMD1_SHIFT));
 179         } else {
 180                 out_be32(&ifc->ifc_nand.nand_fir0,
 181                          (IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
 182                          (IFC_FIR_OP_CA0 << IFC_NAND_FIR0_OP1_SHIFT) |
 183                          (IFC_FIR_OP_RA0  << IFC_NAND_FIR0_OP2_SHIFT) |
 184                          (IFC_FIR_OP_BTRD << IFC_NAND_FIR0_OP3_SHIFT));
 185                 out_be32(&ifc->ifc_nand.nand_fir1, 0x0);
 186
 187                 out_be32(&ifc->ifc_nand.nand_fcr0,
 188                         NAND_CMD_READ0 << IFC_NAND_FCR0_CMD0_SHIFT);
 189         }
 190
 191         /* Program FBCR = 0 for full page read */
 192         out_be32(&ifc->ifc_nand.nand_fbcr, 0);
 193
 194         /* Read and copy u-boot on SDRAM from NAND device, In parallel
 195          * check for Bad block if found skip it and read continue to
 196          * next Block
 197          */
 198         while (pos < uboot_size) {
 199                 int i = 0;
 200                 do {
 201                         pg_no = offs / page_size;
 202                         bufnum = pg_no & bufnum_mask;
 203                         sram_addr = bufnum * page_size * 2;
 204
 205                         out_be32(&ifc->ifc_nand.row0, pg_no);
 206                         out_be32(&ifc->ifc_nand.col0, 0);
 207                         /* start read */
 208                         out_be32(&ifc->ifc_nand.nandseq_strt,
 209                                 IFC_NAND_SEQ_STRT_FIR_STRT);
 210
 211                         /* wait for read to complete */
 212                         nand_wait(&buf[sram_addr], bufnum, page_size);
 213
 214                         /*
 215                          * If either of the first two pages are marked bad,
 216                          * continue to the next block.
 217                          */
 218                         if (i++ < 2 &&
 219                             bad_block(&buf[sram_addr + page_size + bad_marker],
 220                                       port_size)) {
 221                                 puts("skipping\n");
 222                                 offs = (offs + blk_size) & ~(blk_size - 1);
 223                                 pos &= ~(blk_size - 1);
 224                                 break;
 225                         }
 226
 227                         for (j = 0; j < page_size; j++)
 228                                 dst[pos + j] = __raw_readb(&buf[sram_addr + j]);
 229
 230                         pos += page_size;
 231                         offs += page_size;
 232                 } while ((offs & (blk_size - 1)) && (pos < uboot_size));
 233         }
 234 }
 235
 236 /*
 237  * Main entrypoint for NAND Boot. It's necessary that SDRAM is already
 238  * configured and available since this code loads the main U-boot image
 239  * from NAND into SDRAM and starts from there.
 240  */
 241 void nand_boot(void)
 242 {
 243         __attribute__((noreturn)) void (*uboot)(void);
 244
 245         /*
 246          * Load U-Boot image from NAND into RAM
 247          */
 248         nand_load(CONFIG_SYS_NAND_U_BOOT_OFFS, CONFIG_SYS_NAND_U_BOOT_SIZE,
 249                   (uchar *)CONFIG_SYS_NAND_U_BOOT_DST);
 250
 251 #ifdef CONFIG_NAND_ENV_DST
 252         nand_load(CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE,
 253                   (uchar *)CONFIG_NAND_ENV_DST);
 254
 255 #ifdef CONFIG_ENV_OFFSET_REDUND
 256         nand_load(CONFIG_ENV_OFFSET_REDUND, CONFIG_ENV_SIZE,
 257                   (uchar *)CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE);
 258 #endif
 259 #endif
 260
 261         /*
 262          * Jump to U-Boot image
 263          */
 264         /*
 265          * Clean d-cache and invalidate i-cache, to
 266          * make sure that no stale data is executed.
 267          */
 268         flush_cache(CONFIG_SYS_NAND_U_BOOT_DST, CONFIG_SYS_NAND_U_BOOT_SIZE);
 269         uboot = (void *)CONFIG_SYS_NAND_U_BOOT_START;
 270         uboot();
 271 }