board/ip860/ip860.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 <commproc.h>
  26 #include <mpc8xx.h>
  27
  28 /* ------------------------------------------------------------------------- */
  29
  30 static long int dram_size (long int, long int *, long int);
  31 unsigned long ip860_get_dram_size(void);
  32 unsigned long ip860_get_clk_freq (void);
  33 /* ------------------------------------------------------------------------- */
  34
  35 #define _NOT_USED_      0xFFFFFFFF
  36
  37 const uint sdram_table[] = {
  38         /*
  39          * Single Read. (Offset 0 in UPMA RAM)
  40          */
  41         0x1f07fc04, 0xeeaefc04, 0x11adfc04, 0xefbbbc00,
  42         0x1ff77c47,                                     /* last */
  43         /*
  44          * SDRAM Initialization (offset 5 in UPMA RAM)
  45          *
  46          * This is no UPM entry point. The following definition uses
  47          * the remaining space to establish an initialization
  48          * sequence, which is executed by a RUN command.
  49          *
  50          */
  51         0x1ff77c34, 0xefeabc34, 0x1fb57c35,     /* last */
  52         /*
  53          * Burst Read. (Offset 8 in UPMA RAM)
  54          */
  55         0x1f07fc04, 0xeeaefc04, 0x10adfc04, 0xf0affc00,
  56         0xf0affc00, 0xf1affc00, 0xefbbbc00, 0x1ff77c47, /* last */
  57         _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  58         _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  59         /*
  60          * Single Write. (Offset 18 in UPMA RAM)
  61          */
  62         0x1f27fc04, 0xeeaebc00, 0x01b93c04, 0x1ff77c47, /* last */
  63         _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  64         /*
  65          * Burst Write. (Offset 20 in UPMA RAM)
  66          */
  67         0x1f07fc04, 0xeeaebc00, 0x10ad7c00, 0xf0affc00,
  68         0xf0affc00, 0xe1bbbc04, 0x1ff77c47,     /* last */
  69         _NOT_USED_,
  70         _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  71         _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  72         /*
  73          * Refresh  (Offset 30 in UPMA RAM)
  74          */
  75         0x1ff5fc84, 0xfffffc04, 0xfffffc04, 0xfffffc04,
  76         0xfffffc84, 0xfffffc07,         /* last */
  77         _NOT_USED_, _NOT_USED_,
  78         _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
  79         /*
  80          * Exception. (Offset 3c in UPMA RAM)
  81          */
  82         0x7ffffc07,                                     /* last */
  83         _NOT_USED_, _NOT_USED_, _NOT_USED_,
  84 };
  85
  86
  87 /* ------------------------------------------------------------------------- */
  88 int board_pre_init(void)
  89 {
  90     volatile immap_t     *immap  = (immap_t *)CFG_IMMR;
  91     volatile memctl8xx_t *memctl = &immap->im_memctl;
  92
  93 /* init BCSR chipselect line for ip860_get_clk_freq() and ip860_get_dram_size() */
  94     memctl->memc_or4 = CFG_OR4;
  95     memctl->memc_br4 = CFG_BR4;
  96
  97     return 0;
  98 }
  99
 100
 101 /* ------------------------------------------------------------------------- */
 102
 103 /*
 104  * Check Board Identity:
 105  *
 106  * Test ID string (IP860...)
 107  */
 108
 109 int checkboard (void)
 110 {
 111         unsigned char *s, *e;
 112         unsigned char buf[64];
 113         int i;
 114
 115         puts ("Board: ");
 116
 117         i = getenv_r ("serial#", buf, sizeof (buf));
 118         s = (i > 0) ? buf : NULL;
 119
 120         if (!s || strncmp (s, "IP860", 5)) {
 121                 puts ("### No HW ID - assuming IP860");
 122         } else {
 123                 for (e = s; *e; ++e) {
 124                         if (*e == ' ')
 125                                 break;
 126                 }
 127
 128                 for (; s < e; ++s) {
 129                         putc (*s);
 130                 }
 131         }
 132
 133         putc ('\n');
 134
 135         return (0);
 136 }
 137
 138 /* ------------------------------------------------------------------------- */
 139
 140 long int initdram (int board_type)
 141 {
 142         volatile immap_t *immap = (immap_t *) CFG_IMMR;
 143         volatile memctl8xx_t *memctl = &immap->im_memctl;
 144         long int size;
 145         ulong refresh_val;
 146
 147         upmconfig (UPMA, (uint *) sdram_table,
 148                            sizeof (sdram_table) / sizeof (uint));
 149
 150         /*
 151          * Preliminary prescaler for refresh
 152          */
 153         if (ip860_get_clk_freq() == 50000000)
 154         {
 155                 memctl->memc_mptpr = 0x0400;
 156                 refresh_val = 0xC3000000;
 157         }
 158         else
 159         {
 160                 memctl->memc_mptpr = 0x0200;
 161                 refresh_val = 0x9C000000;
 162         }
 163
 164
 165         memctl->memc_mar = 0x00000088;
 166
 167         /*
 168          * Map controller banks 2 to the SDRAM address
 169          */
 170         memctl->memc_or2 = CFG_OR2;
 171         memctl->memc_br2 = CFG_BR2;
 172
 173         /* IP860 boards have only one bank SDRAM */
 174
 175
 176         udelay (200);
 177
 178         /* perform SDRAM initializsation sequence */
 179
 180         memctl->memc_mamr = 0x00804114 | refresh_val;
 181         memctl->memc_mcr  = 0x80004105; /* run precharge pattern from loc 5 */
 182         udelay(1);
 183         memctl->memc_mamr = 0x00804118 | refresh_val;
 184         memctl->memc_mcr  = 0x80004130; /* run refresh pattern 8 times */
 185
 186
 187         udelay (1000);
 188
 189         /*
 190          * Check SDRAM Memory Size
 191          */
 192         if (ip860_get_dram_size() == 16)
 193                 size = dram_size (refresh_val | 0x00804114, (ulong *)SDRAM_BASE, SDRAM_MAX_SIZE);
 194         else
 195                 size = dram_size (refresh_val | 0x00906114, (ulong *)SDRAM_BASE, SDRAM_MAX_SIZE);
 196
 197         udelay (1000);
 198
 199         memctl->memc_or2 = ((-size) & 0xFFFF0000) | SDRAM_TIMING;
 200         memctl->memc_br2 = (CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V;
 201
 202         udelay (10000);
 203
 204         /*
 205          * Also, map other memory to correct position
 206          */
 207
 208 #if (defined(CFG_OR1) && defined(CFG_BR1_PRELIM))
 209         memctl->memc_or1 = CFG_OR1;
 210         memctl->memc_br1 = CFG_BR1;
 211 #endif
 212
 213 #if defined(CFG_OR3) && defined(CFG_BR3)
 214         memctl->memc_or3 = CFG_OR3;
 215         memctl->memc_br3 = CFG_BR3;
 216 #endif
 217
 218 #if defined(CFG_OR4) && defined(CFG_BR4)
 219         memctl->memc_or4 = CFG_OR4;
 220         memctl->memc_br4 = CFG_BR4;
 221 #endif
 222
 223 #if defined(CFG_OR5) && defined(CFG_BR5)
 224         memctl->memc_or5 = CFG_OR5;
 225         memctl->memc_br5 = CFG_BR5;
 226 #endif
 227
 228 #if defined(CFG_OR6) && defined(CFG_BR6)
 229         memctl->memc_or6 = CFG_OR6;
 230         memctl->memc_br6 = CFG_BR6;
 231 #endif
 232
 233 #if defined(CFG_OR7) && defined(CFG_BR7)
 234         memctl->memc_or7 = CFG_OR7;
 235         memctl->memc_br7 = CFG_BR7;
 236 #endif
 237
 238         return (size);
 239 }
 240
 241 /* ------------------------------------------------------------------------- */
 242
 243 /*
 244  * Check memory range for valid RAM. A simple memory test determines
 245  * the actually available RAM size between addresses `base' and
 246  * `base + maxsize'. Some (not all) hardware errors are detected:
 247  * - short between address lines
 248  * - short between data lines
 249  */
 250
 251 static long int dram_size (long int mamr_value, long int *base,
 252                                                    long int maxsize)
 253 {
 254         volatile immap_t *immap = (immap_t *) CFG_IMMR;
 255         volatile memctl8xx_t *memctl = &immap->im_memctl;
 256         volatile long int *addr;
 257         ulong cnt, val;
 258         ulong save[32];                         /* to make test non-destructive */
 259         unsigned char i = 0;
 260
 261         memctl->memc_mamr = mamr_value;
 262
 263         for (cnt = maxsize / sizeof (long); cnt > 0; cnt >>= 1) {
 264                 addr = base + cnt;              /* pointer arith! */
 265
 266                 save[i++] = *addr;
 267                 *addr = ~cnt;
 268         }
 269
 270         /* write 0 to base address */
 271         addr = base;
 272         save[i] = *addr;
 273         *addr = 0;
 274
 275         /* check at base address */
 276         if ((val = *addr) != 0) {
 277                 *addr = save[i];
 278                 return (0);
 279         }
 280
 281         for (cnt = 1; cnt <= maxsize / sizeof (long); cnt <<= 1) {
 282                 addr = base + cnt;              /* pointer arith! */
 283
 284                 val = *addr;
 285                 *addr = save[--i];
 286
 287                 if (val != (~cnt)) {
 288                         return (cnt * sizeof (long));
 289                 }
 290         }
 291         return (maxsize);
 292 }
 293
 294 /* ------------------------------------------------------------------------- */
 295
 296 void reset_phy (void)
 297 {
 298         volatile immap_t *immr = (immap_t *) CFG_IMMR;
 299         ulong mask = PB_ENET_RESET | PB_ENET_JABD;
 300         ulong reg;
 301
 302         /* Make sure PHY is not in low-power mode */
 303         immr->im_cpm.cp_pbpar &= ~(mask);       /* GPIO */
 304         immr->im_cpm.cp_pbodr &= ~(mask);       /* active output */
 305
 306         /* Set  JABD low  (no JABber Disable),
 307          * and RESET high (Reset PHY)
 308          */
 309         reg = immr->im_cpm.cp_pbdat;
 310         reg = (reg & ~PB_ENET_JABD) | PB_ENET_RESET;
 311         immr->im_cpm.cp_pbdat = reg;
 312
 313         /* now drive outputs */
 314         immr->im_cpm.cp_pbdir |= mask;  /* output */
 315         udelay (1000);
 316         /*
 317            * Release RESET signal
 318          */
 319         immr->im_cpm.cp_pbdat &= ~(PB_ENET_RESET);
 320         udelay (1000);
 321 }
 322
 323 /* ------------------------------------------------------------------------- */
 324
 325 unsigned long ip860_get_clk_freq(void)
 326 {
 327         volatile ip860_bcsr_t   *bcsr   = (ip860_bcsr_t *)BCSR_BASE;
 328         ulong temp;
 329         uchar sysclk;
 330
 331         if ((bcsr->bd_status & 0x80) == 0x80)   /* bd_rev valid ? */
 332                 sysclk = (bcsr->bd_rev & 0x18) >> 3;
 333         else
 334                 sysclk = 0x00;
 335
 336         switch (sysclk)
 337         {
 338                 case 0x00:
 339                         temp = 50000000;
 340                         break;
 341
 342                 case 0x01:
 343                         temp = 80000000;
 344                         break;
 345
 346                 default:
 347                         temp = 50000000;
 348                         break;
 349         }
 350
 351         return (temp);
 352
 353 }
 354
 355
 356 /* ------------------------------------------------------------------------- */
 357
 358 unsigned long ip860_get_dram_size(void)
 359 {
 360         volatile ip860_bcsr_t   *bcsr   = (ip860_bcsr_t *)BCSR_BASE;
 361         ulong temp;
 362         uchar dram_size;
 363
 364         if ((bcsr->bd_status & 0x80) == 0x80)   /* bd_rev valid ? */
 365                 dram_size = (bcsr->bd_rev & 0xE0) >> 5;
 366         else
 367                 dram_size = 0x00;       /* default is 16 MB */
 368
 369         switch (dram_size)
 370         {
 371                 case 0x00:
 372                         temp = 16;
 373                         break;
 374
 375                 case 0x01:
 376                         temp = 32;
 377                         break;
 378
 379                 default:
 380                         temp = 16;
 381                         break;
 382         }
 383
 384         return (temp);
 385
 386 }
 387
 388 /* ------------------------------------------------------------------------- */