drivers/mtd/nand/mxc_nand_spl.c

   1 /*
   2  * (C) Copyright 2009
   3  * Magnus Lilja <lilja.magnus@gmail.com>
   4  *
   5  * (C) Copyright 2008
   6  * Maxim Artamonov, <scn1874 at yandex.ru>
   7  *
   8  * (C) Copyright 2006-2008
   9  * Stefan Roese, DENX Software Engineering, sr at denx.de.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 #include <common.h>
  28 #include <nand.h>
  29 #include <asm/arch/imx-regs.h>
  30 #include <asm/io.h>
  31 #include "mxc_nand.h"
  32
  33 #if defined(MXC_NFC_V1) || defined(MXC_NFC_V2_1)
  34 static struct mxc_nand_regs *const nfc = (void *)NFC_BASE_ADDR;
  35 #elif defined(MXC_NFC_V3_2)
  36 static struct mxc_nand_regs *const nfc = (void *)NFC_BASE_ADDR_AXI;
  37 static struct mxc_nand_ip_regs *const nfc_ip = (void *)NFC_BASE_ADDR;
  38 #endif
  39
  40 static void nfc_wait_ready(void)
  41 {
  42         uint32_t tmp;
  43
  44 #if defined(MXC_NFC_V1) || defined(MXC_NFC_V2_1)
  45         while (!(readnfc(&nfc->config2) & NFC_V1_V2_CONFIG2_INT))
  46                 ;
  47
  48         /* Reset interrupt flag */
  49         tmp = readnfc(&nfc->config2);
  50         tmp &= ~NFC_V1_V2_CONFIG2_INT;
  51         writenfc(tmp, &nfc->config2);
  52 #elif defined(MXC_NFC_V3_2)
  53         while (!(readnfc(&nfc_ip->ipc) & NFC_V3_IPC_INT))
  54                 ;
  55
  56         /* Reset interrupt flag */
  57         tmp = readnfc(&nfc_ip->ipc);
  58         tmp &= ~NFC_V3_IPC_INT;
  59         writenfc(tmp, &nfc_ip->ipc);
  60 #endif
  61 }
  62
  63 static void nfc_nand_init(void)
  64 {
  65 #if defined(MXC_NFC_V3_2)
  66         int ecc_per_page = CONFIG_SYS_NAND_PAGE_SIZE / 512;
  67         int tmp;
  68
  69         tmp = (readnfc(&nfc_ip->config2) & ~(NFC_V3_CONFIG2_SPAS_MASK |
  70                         NFC_V3_CONFIG2_EDC_MASK | NFC_V3_CONFIG2_PS_MASK)) |
  71                 NFC_V3_CONFIG2_SPAS(CONFIG_SYS_NAND_OOBSIZE / 2) |
  72                 NFC_V3_CONFIG2_INT_MSK | NFC_V3_CONFIG2_ECC_EN |
  73                 NFC_V3_CONFIG2_ONE_CYCLE;
  74         if (CONFIG_SYS_NAND_PAGE_SIZE == 4096)
  75                 tmp |= NFC_V3_CONFIG2_PS_4096;
  76         else if (CONFIG_SYS_NAND_PAGE_SIZE == 2048)
  77                 tmp |= NFC_V3_CONFIG2_PS_2048;
  78         else if (CONFIG_SYS_NAND_PAGE_SIZE == 512)
  79                 tmp |= NFC_V3_CONFIG2_PS_512;
  80         /*
  81          * if spare size is larger that 16 bytes per 512 byte hunk
  82          * then use 8 symbol correction instead of 4
  83          */
  84         if (CONFIG_SYS_NAND_OOBSIZE / ecc_per_page > 16)
  85                 tmp |= NFC_V3_CONFIG2_ECC_MODE_8;
  86         else
  87                 tmp &= ~NFC_V3_CONFIG2_ECC_MODE_8;
  88         writenfc(tmp, &nfc_ip->config2);
  89
  90         tmp = NFC_V3_CONFIG3_NUM_OF_DEVS(0) |
  91                         NFC_V3_CONFIG3_NO_SDMA |
  92                         NFC_V3_CONFIG3_RBB_MODE |
  93                         NFC_V3_CONFIG3_SBB(6) | /* Reset default */
  94                         NFC_V3_CONFIG3_ADD_OP(0);
  95 #ifndef CONFIG_SYS_NAND_BUSWIDTH_16
  96         tmp |= NFC_V3_CONFIG3_FW8;
  97 #endif
  98         writenfc(tmp, &nfc_ip->config3);
  99
 100         writenfc(0, &nfc_ip->delay_line);
 101 #elif defined(MXC_NFC_V2_1)
 102         int ecc_per_page = CONFIG_SYS_NAND_PAGE_SIZE / 512;
 103         int config1;
 104
 105         writenfc(CONFIG_SYS_NAND_OOBSIZE / 2, &nfc->spare_area_size);
 106
 107         /* unlocking RAM Buff */
 108         writenfc(0x2, &nfc->config);
 109
 110         /* hardware ECC checking and correct */
 111         config1 = readnfc(&nfc->config1) | NFC_V1_V2_CONFIG1_ECC_EN |
 112                         NFC_V1_V2_CONFIG1_INT_MSK | NFC_V2_CONFIG1_ONE_CYCLE |
 113                         NFC_V2_CONFIG1_FP_INT;
 114         /*
 115          * if spare size is larger that 16 bytes per 512 byte hunk
 116          * then use 8 symbol correction instead of 4
 117          */
 118         if (CONFIG_SYS_NAND_OOBSIZE / ecc_per_page > 16)
 119                 config1 &= ~NFC_V2_CONFIG1_ECC_MODE_4;
 120         else
 121                 config1 |= NFC_V2_CONFIG1_ECC_MODE_4;
 122         writenfc(config1, &nfc->config1);
 123 #elif defined(MXC_NFC_V1)
 124         /* unlocking RAM Buff */
 125         writenfc(0x2, &nfc->config);
 126
 127         /* hardware ECC checking and correct */
 128         writenfc(NFC_V1_V2_CONFIG1_ECC_EN | NFC_V1_V2_CONFIG1_INT_MSK,
 129                         &nfc->config1);
 130 #endif
 131 }
 132
 133 static void nfc_nand_command(unsigned short command)
 134 {
 135         writenfc(command, &nfc->flash_cmd);
 136         writenfc(NFC_CMD, &nfc->operation);
 137         nfc_wait_ready();
 138 }
 139
 140 static void nfc_nand_address(unsigned short address)
 141 {
 142         writenfc(address, &nfc->flash_addr);
 143         writenfc(NFC_ADDR, &nfc->operation);
 144         nfc_wait_ready();
 145 }
 146
 147 static void nfc_nand_page_address(unsigned int page_address)
 148 {
 149         unsigned int page_count;
 150
 151         nfc_nand_address(0x00);
 152
 153         /* code only for large page flash */
 154         if (CONFIG_SYS_NAND_PAGE_SIZE > 512)
 155                 nfc_nand_address(0x00);
 156
 157         page_count = CONFIG_SYS_NAND_SIZE / CONFIG_SYS_NAND_PAGE_SIZE;
 158
 159         if (page_address <= page_count) {
 160                 page_count--; /* transform 0x01000000 to 0x00ffffff */
 161                 do {
 162                         nfc_nand_address(page_address & 0xff);
 163                         page_address = page_address >> 8;
 164                         page_count = page_count >> 8;
 165                 } while (page_count);
 166         }
 167
 168         nfc_nand_address(0x00);
 169 }
 170
 171 static void nfc_nand_data_output(void)
 172 {
 173 #ifdef NAND_MXC_2K_MULTI_CYCLE
 174         int i;
 175 #endif
 176
 177 #if defined(MXC_NFC_V1) || defined(MXC_NFC_V2_1)
 178         writenfc(0, &nfc->buf_addr);
 179 #elif defined(MXC_NFC_V3_2)
 180         int config1 = readnfc(&nfc->config1);
 181         config1 &= ~NFC_V3_CONFIG1_RBA_MASK;
 182         writenfc(config1, &nfc->config1);
 183 #endif
 184         writenfc(NFC_OUTPUT, &nfc->operation);
 185         nfc_wait_ready();
 186 #ifdef NAND_MXC_2K_MULTI_CYCLE
 187         /*
 188          * This NAND controller requires multiple input commands
 189          * for pages larger than 512 bytes.
 190          */
 191         for (i = 1; i < CONFIG_SYS_NAND_PAGE_SIZE / 512; i++) {
 192                 writenfc(i, &nfc->buf_addr);
 193                 writenfc(NFC_OUTPUT, &nfc->operation);
 194                 nfc_wait_ready();
 195         }
 196 #endif
 197 }
 198
 199 static int nfc_nand_check_ecc(void)
 200 {
 201 #if defined(MXC_NFC_V1)
 202         u16 ecc_status = readw(&nfc->ecc_status_result);
 203         return (ecc_status & 0x3) == 2 || (ecc_status >> 2) == 2;
 204 #elif defined(MXC_NFC_V2_1) || defined(MXC_NFC_V3_2)
 205         u32 ecc_status = readl(&nfc->ecc_status_result);
 206         int ecc_per_page = CONFIG_SYS_NAND_PAGE_SIZE / 512;
 207         int err_limit = CONFIG_SYS_NAND_OOBSIZE / ecc_per_page > 16 ? 8 : 4;
 208         int subpages = CONFIG_SYS_NAND_PAGE_SIZE / 512;
 209
 210         do {
 211                 if ((ecc_status & 0xf) > err_limit)
 212                         return 1;
 213                 ecc_status >>= 4;
 214         } while (--subpages);
 215
 216         return 0;
 217 #endif
 218 }
 219
 220 static void nfc_nand_read_page(unsigned int page_address)
 221 {
 222         /* read in first 0 buffer */
 223 #if defined(MXC_NFC_V1) || defined(MXC_NFC_V2_1)
 224         writenfc(0, &nfc->buf_addr);
 225 #elif defined(MXC_NFC_V3_2)
 226         int config1 = readnfc(&nfc->config1);
 227         config1 &= ~NFC_V3_CONFIG1_RBA_MASK;
 228         writenfc(config1, &nfc->config1);
 229 #endif
 230         nfc_nand_command(NAND_CMD_READ0);
 231         nfc_nand_page_address(page_address);
 232
 233         if (CONFIG_SYS_NAND_PAGE_SIZE > 512)
 234                 nfc_nand_command(NAND_CMD_READSTART);
 235
 236         nfc_nand_data_output(); /* fill the main buffer 0 */
 237 }
 238
 239 static int nfc_read_page(unsigned int page_address, unsigned char *buf)
 240 {
 241         int i;
 242         u32 *src;
 243         u32 *dst;
 244
 245         nfc_nand_read_page(page_address);
 246
 247         if (nfc_nand_check_ecc())
 248                 return -1;
 249
 250         src = (u32 *)&nfc->main_area[0][0];
 251         dst = (u32 *)buf;
 252
 253         /* main copy loop from NAND-buffer to SDRAM memory */
 254         for (i = 0; i < CONFIG_SYS_NAND_PAGE_SIZE / 4; i++) {
 255                 writel(readl(src), dst);
 256                 src++;
 257                 dst++;
 258         }
 259
 260         return 0;
 261 }
 262
 263 static int is_badblock(int pagenumber)
 264 {
 265         int page = pagenumber;
 266         u32 badblock;
 267         u32 *src;
 268
 269         /* Check the first two pages for bad block markers */
 270         for (page = pagenumber; page < pagenumber + 2; page++) {
 271                 nfc_nand_read_page(page);
 272
 273                 src = (u32 *)&nfc->spare_area[0][0];
 274
 275                 /*
 276                  * IMPORTANT NOTE: The nand flash controller uses a non-
 277                  * standard layout for large page devices. This can
 278                  * affect the position of the bad block marker.
 279                  */
 280                 /* Get the bad block marker */
 281                 badblock = readl(&src[CONFIG_SYS_NAND_BAD_BLOCK_POS / 4]);
 282                 badblock >>= 8 * (CONFIG_SYS_NAND_BAD_BLOCK_POS % 4);
 283                 badblock &= 0xff;
 284
 285                 /* bad block marker verify */
 286                 if (badblock != 0xff)
 287                         return 1; /* potential bad block */
 288         }
 289
 290         return 0;
 291 }
 292
 293 static int nand_load(unsigned int from, unsigned int size, unsigned char *buf)
 294 {
 295         int i;
 296         unsigned int page;
 297         unsigned int maxpages = CONFIG_SYS_NAND_SIZE /
 298                                 CONFIG_SYS_NAND_PAGE_SIZE;
 299
 300         nfc_nand_init();
 301
 302         /* Convert to page number */
 303         page = from / CONFIG_SYS_NAND_PAGE_SIZE;
 304         i = 0;
 305
 306         while (i < size / CONFIG_SYS_NAND_PAGE_SIZE) {
 307                 if (nfc_read_page(page, buf) < 0)
 308                         return -1;
 309
 310                 page++;
 311                 i++;
 312                 buf = buf + CONFIG_SYS_NAND_PAGE_SIZE;
 313
 314                 /*
 315                  * Check if we have crossed a block boundary, and if so
 316                  * check for bad block.
 317                  */
 318                 if (!(page % CONFIG_SYS_NAND_PAGE_COUNT)) {
 319                         /*
 320                          * Yes, new block. See if this block is good. If not,
 321                          * loop until we find a good block.
 322                          */
 323                         while (is_badblock(page)) {
 324                                 page = page + CONFIG_SYS_NAND_PAGE_COUNT;
 325                                 /* Check i we've reached the end of flash. */
 326                                 if (page >= maxpages)
 327                                         return -1;
 328                         }
 329                 }
 330         }
 331
 332         return 0;
 333 }
 334
 335 /*
 336  * The main entry for NAND booting. It's necessary that SDRAM is already
 337  * configured and available since this code loads the main U-Boot image
 338  * from NAND into SDRAM and starts it from there.
 339  */
 340 void nand_boot(void)
 341 {
 342         __attribute__((noreturn)) void (*uboot)(void);
 343
 344         /*
 345          * CONFIG_SYS_NAND_U_BOOT_OFFS and CONFIG_SYS_NAND_U_BOOT_SIZE must
 346          * be aligned to full pages
 347          */
 348         if (!nand_load(CONFIG_SYS_NAND_U_BOOT_OFFS, CONFIG_SYS_NAND_U_BOOT_SIZE,
 349                        (uchar *)CONFIG_SYS_NAND_U_BOOT_DST)) {
 350                 /* Copy from NAND successful, start U-boot */
 351                 uboot = (void *)CONFIG_SYS_NAND_U_BOOT_START;
 352                 uboot();
 353         } else {
 354                 /* Unrecoverable error when copying from NAND */
 355                 hang();
 356         }
 357 }
 358
 359 /*
 360  * Called in case of an exception.
 361  */
 362 void hang(void)
 363 {
 364         /* Loop forever */
 365         while (1) ;
 366 }