board/etx094/etx094.c

   1 /*
   2  * (C) Copyright 2000
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <common.h>
  25 #include <mpc8xx.h>
  26
  27 DECLARE_GLOBAL_DATA_PTR;
  28
  29 /* ------------------------------------------------------------------------- */
  30
  31 static long int dram_size (long int, long int *, long int);
  32 static void read_hw_vers (void);
  33
  34 /* ------------------------------------------------------------------------- */
  35
  36 #define _NOT_USED_      0xFFFFFFFF
  37
  38 const uint sdram_table[] = {
  39
  40         /* single read   (offset 0x00 in upm ram) */
  41
  42         0xEECEFC24, 0x100DFC24, 0xE02FBC04, 0x01AA7C04,
  43         0x1FB5FC00, 0xFFFFFC05, _NOT_USED_, _NOT_USED_,
  44
  45         /* burst read    (offset 0x08 in upm ram) */
  46
  47         0xEECEFC24, 0x100DFC24, 0xE0FFBC04, 0x10FF7C04,
  48         0xF0FFFC00, 0xF0FFFC00, 0xF0FFFC00, 0xFFFFFC00,
  49         0xFFFFFC05, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  50         _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  51
  52         /* single write  (offset 0x18 in upm ram) */
  53
  54         0xEECEFC24, 0x100DFC24, 0xE02BBC04, 0x01A27C00,
  55         0xEFAAFC04, 0x1FB5FC05, _NOT_USED_, _NOT_USED_,
  56
  57         /* burst write   (offset 0x20 in upm ram) */
  58
  59         0xEECEFC24, 0x103DFC24, 0xE0FBBC00, 0x10F77C00,
  60         0xF0FFFC00, 0xF0FFFC00, 0xF0FFFC04, 0xFFFFFC05,
  61
  62         /* init part1      (offset 0x28 in upm ram) */
  63
  64         0xEFFAFC3C, 0x1FF4FC34, 0xEFFCBC34, 0x1FFC3C34,
  65         0xFFFC3C35, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  66
  67         /* refresh   (offset 0x30 in upm ram) */
  68
  69         0xEFFEBC0C, 0x1FFD7C04, 0xFFFFFC04, 0xFFFFFC05,
  70
  71         /* init part2     (offset 0x34 in upm ram) */
  72
  73         0xFFFEBC04, 0xEFFC3CB4, 0x1FFC3C34, 0xFFFC3C34,
  74         0xFFFC3C34, 0xEFE83CB4, 0x1FB57C35, _NOT_USED_,
  75
  76         /* exception     (offset 0x3C in upm ram) */
  77
  78         0xFFFFFC05, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  79
  80 };
  81
  82 /* ------------------------------------------------------------------------- */
  83
  84
  85 /*
  86  * Check Board Identity:
  87  *
  88  * Test ETX ID string (ETX_xxx...)
  89  *
  90  * Return 1 always.
  91  */
  92
  93 int checkboard (void)
  94 {
  95         char *s = getenv ("serial#");
  96         char *e;
  97
  98         puts ("Board: ");
  99
 100 #ifdef SB_ETX094
 101         gd->board_type = 0; /* 0 = 2SDRAM-Device */
 102 #else
 103         gd->board_type = 1; /* 1 = 1SDRAM-Device */
 104 #endif
 105
 106         if (!s || strncmp (s, "ETX_", 4)) {
 107                 puts ("### No HW ID - assuming ETX_094\n");
 108                 read_hw_vers ();
 109                 return (0);
 110         }
 111
 112         for (e = s; *e; ++e) {
 113                 if (*e == ' ')
 114                         break;
 115         }
 116
 117         for (; s < e; ++s) {
 118                 putc (*s);
 119         }
 120         putc ('\n');
 121
 122         read_hw_vers ();
 123         return (0);
 124 }
 125
 126 /* ------------------------------------------------------------------------- */
 127
 128 long int initdram (int board_type)
 129 {
 130         volatile immap_t *immap = (immap_t *) CFG_IMMR;
 131         volatile memctl8xx_t *memctl = &immap->im_memctl;
 132         long int size_b0, size_b1, size8, size9;
 133
 134         upmconfig (UPMA, (uint *) sdram_table,
 135                            sizeof (sdram_table) / sizeof (uint));
 136
 137         /*
 138          * Preliminary prescaler for refresh (depends on number of
 139          * banks): This value is selected for four cycles every 62.4 us
 140          * with two SDRAM banks or four cycles every 31.2 us with one
 141          * bank. It will be adjusted after memory sizing.
 142          */
 143         memctl->memc_mptpr = CFG_MPTPR_1BK_4K;  /* MPTPR_PTP_DIV32 0x0200 */
 144
 145         /* A3(SDRAM)=0      => Bursttype = Sequential
 146          * A2-A0(SDRAM)=010 => Burst length = 4
 147          * A4-A6(SDRAM)=010 => CasLat=2
 148          */
 149         memctl->memc_mar = 0x00000088;
 150
 151         /*
 152          * Map controller banks 2 and 3 to the SDRAM banks 2 and 3 at
 153          * preliminary addresses - these have to be modified after the
 154          * SDRAM size has been determined.
 155          */
 156         memctl->memc_or2 = CFG_OR2_PRELIM;
 157         memctl->memc_br2 = CFG_BR2_PRELIM;
 158
 159         if (board_type == 0) {  /* "L" type boards have only one bank SDRAM */
 160                 memctl->memc_or3 = CFG_OR3_PRELIM;
 161                 memctl->memc_br3 = CFG_BR3_PRELIM;
 162         }
 163
 164         memctl->memc_mamr = CFG_MAMR_8COL & (~(MAMR_PTAE));     /* no refresh yet */
 165
 166         udelay (200);
 167
 168         /* perform SDRAM initializsation sequence */
 169
 170         memctl->memc_mcr = 0x80004128;  /* SDRAM bank 0 (CS2) - Init Part 1 */
 171         memctl->memc_mcr = 0x80004734;  /* SDRAM bank 0 (CS2) - Init Part 2 */
 172         udelay (1);
 173
 174         if (board_type == 0) {          /* "L" type boards have only one bank SDRAM */
 175                 memctl->memc_mcr = 0x80006128;  /* SDRAM bank 1 (CS3) - Init Part 1 */
 176                 memctl->memc_mcr = 0x80006734;  /* SDRAM bank 1 (CS3) - Init Part 2 */
 177                 udelay (1);
 178         }
 179
 180         memctl->memc_mamr |= MAMR_PTAE; /* enable refresh */
 181
 182         udelay (1000);
 183
 184         /*
 185          * Check Bank 0 Memory Size for re-configuration
 186          *
 187          * try 8 column mode
 188          */
 189         size8 = dram_size (CFG_MAMR_8COL, (long *) SDRAM_BASE2_PRELIM,
 190                                            SDRAM_MAX_SIZE);
 191
 192         udelay (1000);
 193
 194         /*
 195          * try 9 column mode
 196          */
 197         size9 = dram_size (CFG_MAMR_9COL, (long *) SDRAM_BASE2_PRELIM,
 198                                            SDRAM_MAX_SIZE);
 199
 200         if (size8 < size9) {            /* leave configuration at 9 columns */
 201                 size_b0 = size9;
 202 /*      debug ("SDRAM Bank 0 in 9 column mode: %ld MB\n", size >> 20);  */
 203         } else {                                        /* back to 8 columns            */
 204                 size_b0 = size8;
 205                 memctl->memc_mamr = CFG_MAMR_8COL;
 206                 udelay (500);
 207 /*      debug ("SDRAM Bank 0 in 8 column mode: %ld MB\n", size >> 20);  */
 208         }
 209
 210         if (board_type == 0) {          /* "L" type boards have only one bank SDRAM */
 211                 /*
 212                  * Check Bank 1 Memory Size
 213                  * use current column settings
 214                  * [9 column SDRAM may also be used in 8 column mode,
 215                  *  but then only half the real size will be used.]
 216                  */
 217                 size_b1 =
 218                                 dram_size (memctl->memc_mamr, (long *) SDRAM_BASE3_PRELIM,
 219                                                    SDRAM_MAX_SIZE);
 220 /*      debug ("SDRAM Bank 1: %ld MB\n", size8 >> 20);  */
 221         } else {
 222                 size_b1 = 0;
 223         }
 224
 225         udelay (1000);
 226
 227         /*
 228          * Adjust refresh rate depending on SDRAM type, both banks
 229          * For types > 128 MBit leave it at the current (fast) rate
 230          */
 231         if ((size_b0 < 0x02000000) && (size_b1 < 0x02000000)) {
 232                 /* reduce to 15.6 us (62.4 us / quad) */
 233                 memctl->memc_mptpr = CFG_MPTPR_2BK_4K;  /*DIV16 */
 234                 udelay (1000);
 235         }
 236
 237         /*
 238          * Final mapping: map bigger bank first
 239          */
 240         if (size_b1 > size_b0) {        /* SDRAM Bank 1 is bigger - map first   */
 241
 242                 memctl->memc_or3 = ((-size_b1) & 0xFFFF0000) | CFG_OR_TIMING_SDRAM;
 243                 memctl->memc_br3 =
 244                         (CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V;
 245
 246                 if (size_b0 > 0) {
 247                         /*
 248                          * Position Bank 0 immediately above Bank 1
 249                          */
 250                         memctl->memc_or2 =
 251                                 ((-size_b0) & 0xFFFF0000) | CFG_OR_TIMING_SDRAM;
 252                         memctl->memc_br2 =
 253                                 ((CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V)
 254                                 + size_b1;
 255                 } else {
 256                         unsigned long reg;
 257
 258                         /*
 259                          * No bank 0
 260                          *
 261                          * invalidate bank
 262                          */
 263                         memctl->memc_br2 = 0;
 264
 265                         /* adjust refresh rate depending on SDRAM type, one bank */
 266                         reg = memctl->memc_mptpr;
 267                         reg >>= 1;      /* reduce to CFG_MPTPR_1BK_8K / _4K */
 268                         memctl->memc_mptpr = reg;
 269                 }
 270
 271         } else {                        /* SDRAM Bank 0 is bigger - map first   */
 272
 273                 memctl->memc_or2 = ((-size_b0) & 0xFFFF0000) | CFG_OR_TIMING_SDRAM;
 274                 memctl->memc_br2 =
 275                                 (CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V;
 276
 277                 if (size_b1 > 0) {
 278                         /*
 279                          * Position Bank 1 immediately above Bank 0
 280                          */
 281                         memctl->memc_or3 =
 282                                         ((-size_b1) & 0xFFFF0000) | CFG_OR_TIMING_SDRAM;
 283                         memctl->memc_br3 =
 284                                         ((CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V)
 285                                         + size_b0;
 286                 } else {
 287                         unsigned long reg;
 288
 289                         /*
 290                          * No bank 1
 291                          *
 292                          * invalidate bank
 293                          */
 294                         memctl->memc_br3 = 0;
 295
 296                         /* adjust refresh rate depending on SDRAM type, one bank */
 297                         reg = memctl->memc_mptpr;
 298                         reg >>= 1;      /* reduce to CFG_MPTPR_1BK_8K / _4K */
 299                         memctl->memc_mptpr = reg;
 300                 }
 301         }
 302
 303         udelay (10000);
 304
 305         return (size_b0 + size_b1);
 306 }
 307
 308 /* ------------------------------------------------------------------------- */
 309
 310 /*
 311  * Check memory range for valid RAM. A simple memory test determines
 312  * the actually available RAM size between addresses `base' and
 313  * `base + maxsize'. Some (not all) hardware errors are detected:
 314  * - short between address lines
 315  * - short between data lines
 316  */
 317
 318 static long int dram_size (long int mamr_value, long int *base,
 319                                                    long int maxsize)
 320 {
 321         volatile immap_t *immap = (immap_t *) CFG_IMMR;
 322         volatile memctl8xx_t *memctl = &immap->im_memctl;
 323
 324         memctl->memc_mamr = mamr_value;
 325
 326         return (get_ram_size(base, maxsize));
 327 }
 328
 329 /* ------------------------------------------------------------------------- */
 330
 331 /* HW-ID Table (Bits: 2^9;2^7;2^5) */
 332 #define HW_ID_0 0x0000
 333 #define HW_ID_1 0x0020
 334 #define HW_ID_2 0x0080
 335 #define HW_ID_3 0x00a0
 336 #define HW_ID_4 0x0200
 337 #define HW_ID_5 0x0220
 338 #define HW_ID_6 0x0280
 339 #define HW_ID_7 0x02a0
 340
 341 void read_hw_vers ()
 342 {
 343         unsigned short rd_msk = 0x02A0;
 344
 345         /* HW-ID pin-definition */
 346         volatile immap_t *immr = (immap_t *) CFG_IMMR;
 347
 348         immr->im_ioport.iop_pddir &= ~(rd_msk);
 349         immr->im_ioport.iop_pdpar &= ~(rd_msk);
 350
 351         /* debug printf("State of PD: %x\n",immr->im_ioport.iop_pddat); */
 352
 353         /* Check the HW-ID */
 354         printf ("HW-Version: ");
 355         switch (immr->im_ioport.iop_pddat & rd_msk) {
 356         case HW_ID_0:
 357                 printf ("V0.1 - V0.3 / W97238-Q3162-A1-1-2\n");
 358                 break;
 359         case HW_ID_1:
 360                 printf ("V0.9 / W50037-Q1-D6-1\n");
 361                 break;
 362         case HW_ID_2:
 363                 printf ("NOT USED - assuming ID#2\n");
 364                 break;
 365         case HW_ID_3:
 366                 printf ("NOT USED - assuming ID#3\n");
 367                 break;
 368         case HW_ID_4:
 369                 printf ("NOT USED - assuming ID#4\n");
 370                 break;
 371         case HW_ID_5:
 372                 printf ("NOT USED - assuming ID#5\n");
 373                 break;
 374         case HW_ID_6:
 375                 printf ("NOT USED - assuming ID#6\n");
 376                 break;
 377         case HW_ID_7:
 378                 printf ("NOT USED - assuming ID#7\n");
 379                 break;
 380         default:
 381                 printf ("###Error###\n");
 382                 break;
 383         }
 384 }
 385
 386 /* ------------------------------------------------------------------------- */