1 /* 2 * (C) Copyright 2000-2002 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 /* 25 * m8xx.c 26 * 27 * CPU specific code 28 * 29 * written or collected and sometimes rewritten by 30 * Magnus Damm <damm@bitsmart.com> 31 * 32 * minor modifications by 33 * Wolfgang Denk <wd@denx.de> 34 */ 35 36 #include <common.h> 37 #include <watchdog.h> 38 #include <command.h> 39 #include <mpc8xx.h> 40 #include <commproc.h> 41 #include <netdev.h> 42 #include <asm/cache.h> 43 #include <linux/compiler.h> 44 #include <asm/io.h> 45 46 #if defined(CONFIG_OF_LIBFDT) 47 #include <libfdt.h> 48 #include <fdt_support.h> 49 #endif 50 51 DECLARE_GLOBAL_DATA_PTR; 52 53 static char *cpu_warning = "\n " \ 54 "*** Warning: CPU Core has Silicon Bugs -- Check the Errata ***"; 55 56 #if ((defined(CONFIG_MPC86x) || defined(CONFIG_MPC855)) && \ 57 !defined(CONFIG_MPC862)) 58 59 static int check_CPU (long clock, uint pvr, uint immr) 60 { 61 char *id_str = 62 # if defined(CONFIG_MPC855) 63 "PC855"; 64 # elif defined(CONFIG_MPC860P) 65 "PC860P"; 66 # else 67 NULL; 68 # endif 69 volatile immap_t *immap = (immap_t *) (immr & 0xFFFF0000); 70 uint k, m; 71 char buf[32]; 72 char pre = 'X'; 73 char *mid = "xx"; 74 char *suf; 75 76 /* the highest 16 bits should be 0x0050 for a 860 */ 77 78 if ((pvr >> 16) != 0x0050) 79 return -1; 80 81 k = (immr << 16) | *((ushort *) & immap->im_cpm.cp_dparam[0xB0]); 82 m = 0; 83 suf = ""; 84 85 /* 86 * Some boards use sockets so different CPUs can be used. 87 * We have to check chip version in run time. 88 */ 89 switch (k) { 90 case 0x00020001: pre = 'P'; break; 91 case 0x00030001: break; 92 case 0x00120003: suf = "A"; break; 93 case 0x00130003: suf = "A3"; break; 94 95 case 0x00200004: suf = "B"; break; 96 97 case 0x00300004: suf = "C"; break; 98 case 0x00310004: suf = "C1"; m = 1; break; 99 100 case 0x00200064: mid = "SR"; suf = "B"; break; 101 case 0x00300065: mid = "SR"; suf = "C"; break; 102 case 0x00310065: mid = "SR"; suf = "C1"; m = 1; break; 103 case 0x05010000: suf = "D3"; m = 1; break; 104 case 0x05020000: suf = "D4"; m = 1; break; 105 /* this value is not documented anywhere */ 106 case 0x40000000: pre = 'P'; suf = "D"; m = 1; break; 107 /* MPC866P/MPC866T/MPC859T/MPC859DSL/MPC852T */ 108 case 0x08010004: /* Rev. A.0 */ 109 suf = "A"; 110 /* fall through */ 111 case 0x08000003: /* Rev. 0.3 */ 112 pre = 'M'; m = 1; 113 if (id_str == NULL) 114 id_str = 115 # if defined(CONFIG_MPC852T) 116 "PC852T"; 117 # elif defined(CONFIG_MPC859T) 118 "PC859T"; 119 # elif defined(CONFIG_MPC859DSL) 120 "PC859DSL"; 121 # elif defined(CONFIG_MPC866T) 122 "PC866T"; 123 # else 124 "PC866x"; /* Unknown chip from MPC866 family */ 125 # endif 126 break; 127 case 0x09000000: pre = 'M'; mid = suf = ""; m = 1; 128 if (id_str == NULL) 129 id_str = "PC885"; /* 870/875/880/885 */ 130 break; 131 132 default: suf = NULL; break; 133 } 134 135 if (id_str == NULL) 136 id_str = "PC86x"; /* Unknown 86x chip */ 137 if (suf) 138 printf ("%c%s%sZPnn%s", pre, id_str, mid, suf); 139 else 140 printf ("unknown M%s (0x%08x)", id_str, k); 141 142 143 #if defined(CONFIG_SYS_8xx_CPUCLK_MIN) && defined(CONFIG_SYS_8xx_CPUCLK_MAX) 144 printf (" at %s MHz [%d.%d...%d.%d MHz]\n ", 145 strmhz (buf, clock), 146 CONFIG_SYS_8xx_CPUCLK_MIN / 1000000, 147 ((CONFIG_SYS_8xx_CPUCLK_MIN % 1000000) + 50000) / 100000, 148 CONFIG_SYS_8xx_CPUCLK_MAX / 1000000, 149 ((CONFIG_SYS_8xx_CPUCLK_MAX % 1000000) + 50000) / 100000 150 ); 151 #else 152 printf (" at %s MHz: ", strmhz (buf, clock)); 153 #endif 154 printf ("%u kB I-Cache %u kB D-Cache", 155 checkicache () >> 10, 156 checkdcache () >> 10 157 ); 158 159 /* do we have a FEC (860T/P or 852/859/866/885)? */ 160 161 immap->im_cpm.cp_fec.fec_addr_low = 0x12345678; 162 if (immap->im_cpm.cp_fec.fec_addr_low == 0x12345678) { 163 printf (" FEC present"); 164 } 165 166 if (!m) { 167 puts (cpu_warning); 168 } 169 170 putc ('\n'); 171 172 #ifdef DEBUG 173 if(clock != measure_gclk()) { 174 printf ("clock %ldHz != %dHz\n", clock, measure_gclk()); 175 } 176 #endif 177 178 return 0; 179 } 180 181 #elif defined(CONFIG_MPC862) 182 183 static int check_CPU (long clock, uint pvr, uint immr) 184 { 185 volatile immap_t *immap = (immap_t *) (immr & 0xFFFF0000); 186 uint k, m; 187 char buf[32]; 188 char pre = 'X'; 189 __maybe_unused char *mid = "xx"; 190 char *suf; 191 192 /* the highest 16 bits should be 0x0050 for a 8xx */ 193 194 if ((pvr >> 16) != 0x0050) 195 return -1; 196 197 k = (immr << 16) | *((ushort *) & immap->im_cpm.cp_dparam[0xB0]); 198 m = 0; 199 200 switch (k) { 201 202 /* this value is not documented anywhere */ 203 case 0x06000000: mid = "P"; suf = "0"; break; 204 case 0x06010001: mid = "P"; suf = "A"; m = 1; break; 205 case 0x07000003: mid = "P"; suf = "B"; m = 1; break; 206 default: suf = NULL; break; 207 } 208 209 #ifndef CONFIG_MPC857 210 if (suf) 211 printf ("%cPC862%sZPnn%s", pre, mid, suf); 212 else 213 printf ("unknown MPC862 (0x%08x)", k); 214 #else 215 if (suf) 216 printf ("%cPC857TZPnn%s", pre, suf); /* only 857T tested right now! */ 217 else 218 printf ("unknown MPC857 (0x%08x)", k); 219 #endif 220 221 printf (" at %s MHz:", strmhz (buf, clock)); 222 223 printf (" %u kB I-Cache", checkicache () >> 10); 224 printf (" %u kB D-Cache", checkdcache () >> 10); 225 226 /* lets check and see if we're running on a 862T (or P?) */ 227 228 immap->im_cpm.cp_fec.fec_addr_low = 0x12345678; 229 if (immap->im_cpm.cp_fec.fec_addr_low == 0x12345678) { 230 printf (" FEC present"); 231 } 232 233 if (!m) { 234 puts (cpu_warning); 235 } 236 237 putc ('\n'); 238 239 return 0; 240 } 241 242 #elif defined(CONFIG_MPC823) 243 244 static int check_CPU (long clock, uint pvr, uint immr) 245 { 246 volatile immap_t *immap = (immap_t *) (immr & 0xFFFF0000); 247 uint k, m; 248 char buf[32]; 249 char *suf; 250 251 /* the highest 16 bits should be 0x0050 for a 8xx */ 252 253 if ((pvr >> 16) != 0x0050) 254 return -1; 255 256 k = (immr << 16) | in_be16((ushort *)&immap->im_cpm.cp_dparam[0xB0]); 257 m = 0; 258 259 switch (k) { 260 /* MPC823 */ 261 case 0x20000000: suf = "0"; break; 262 case 0x20010000: suf = "0.1"; break; 263 case 0x20020000: suf = "Z2/3"; break; 264 case 0x20020001: suf = "Z3"; break; 265 case 0x21000000: suf = "A"; break; 266 case 0x21010000: suf = "B"; m = 1; break; 267 case 0x21010001: suf = "B2"; m = 1; break; 268 /* MPC823E */ 269 case 0x24010000: suf = NULL; 270 puts ("PPC823EZTnnB2"); 271 m = 1; 272 break; 273 default: 274 suf = NULL; 275 printf ("unknown MPC823 (0x%08x)", k); 276 break; 277 } 278 if (suf) 279 printf ("PPC823ZTnn%s", suf); 280 281 printf (" at %s MHz:", strmhz (buf, clock)); 282 283 printf (" %u kB I-Cache", checkicache () >> 10); 284 printf (" %u kB D-Cache", checkdcache () >> 10); 285 286 /* lets check and see if we're running on a 860T (or P?) */ 287 288 immap->im_cpm.cp_fec.fec_addr_low = 0x12345678; 289 if (immap->im_cpm.cp_fec.fec_addr_low == 0x12345678) { 290 puts (" FEC present"); 291 } 292 293 if (!m) { 294 puts (cpu_warning); 295 } 296 297 putc ('\n'); 298 299 return 0; 300 } 301 302 #elif defined(CONFIG_MPC850) 303 304 static int check_CPU (long clock, uint pvr, uint immr) 305 { 306 volatile immap_t *immap = (immap_t *) (immr & 0xFFFF0000); 307 uint k, m; 308 char buf[32]; 309 310 /* the highest 16 bits should be 0x0050 for a 8xx */ 311 312 if ((pvr >> 16) != 0x0050) 313 return -1; 314 315 k = (immr << 16) | *((ushort *) & immap->im_cpm.cp_dparam[0xB0]); 316 m = 0; 317 318 switch (k) { 319 case 0x20020001: 320 printf ("XPC850xxZT"); 321 break; 322 case 0x21000065: 323 printf ("XPC850xxZTA"); 324 break; 325 case 0x21010067: 326 printf ("XPC850xxZTB"); 327 m = 1; 328 break; 329 case 0x21020068: 330 printf ("XPC850xxZTC"); 331 m = 1; 332 break; 333 default: 334 printf ("unknown MPC850 (0x%08x)", k); 335 } 336 printf (" at %s MHz:", strmhz (buf, clock)); 337 338 printf (" %u kB I-Cache", checkicache () >> 10); 339 printf (" %u kB D-Cache", checkdcache () >> 10); 340 341 /* lets check and see if we're running on a 850T (or P?) */ 342 343 immap->im_cpm.cp_fec.fec_addr_low = 0x12345678; 344 if (immap->im_cpm.cp_fec.fec_addr_low == 0x12345678) { 345 printf (" FEC present"); 346 } 347 348 if (!m) { 349 puts (cpu_warning); 350 } 351 352 putc ('\n'); 353 354 return 0; 355 } 356 #else 357 #error CPU undefined 358 #endif 359 /* ------------------------------------------------------------------------- */ 360 361 int checkcpu (void) 362 { 363 ulong clock = gd->cpu_clk; 364 uint immr = get_immr (0); /* Return full IMMR contents */ 365 uint pvr = get_pvr (); 366 367 puts ("CPU: "); 368 369 /* 850 has PARTNUM 20 */ 370 /* 801 has PARTNUM 10 */ 371 return check_CPU (clock, pvr, immr); 372 } 373 374 /* ------------------------------------------------------------------------- */ 375 /* L1 i-cache */ 376 /* the standard 860 has 128 sets of 16 bytes in 2 ways (= 4 kB) */ 377 /* the 860 P (plus) has 256 sets of 16 bytes in 4 ways (= 16 kB) */ 378 379 int checkicache (void) 380 { 381 volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; 382 volatile memctl8xx_t *memctl = &immap->im_memctl; 383 u32 cacheon = rd_ic_cst () & IDC_ENABLED; 384 385 #ifdef CONFIG_IP86x 386 u32 k = memctl->memc_br1 & ~0x00007fff; /* probe in flash memoryarea */ 387 #else 388 u32 k = memctl->memc_br0 & ~0x00007fff; /* probe in flash memoryarea */ 389 #endif 390 u32 m; 391 u32 lines = -1; 392 393 wr_ic_cst (IDC_UNALL); 394 wr_ic_cst (IDC_INVALL); 395 wr_ic_cst (IDC_DISABLE); 396 __asm__ volatile ("isync"); 397 398 while (!((m = rd_ic_cst ()) & IDC_CERR2)) { 399 wr_ic_adr (k); 400 wr_ic_cst (IDC_LDLCK); 401 __asm__ volatile ("isync"); 402 403 lines++; 404 k += 0x10; /* the number of bytes in a cacheline */ 405 } 406 407 wr_ic_cst (IDC_UNALL); 408 wr_ic_cst (IDC_INVALL); 409 410 if (cacheon) 411 wr_ic_cst (IDC_ENABLE); 412 else 413 wr_ic_cst (IDC_DISABLE); 414 415 __asm__ volatile ("isync"); 416 417 return lines << 4; 418 }; 419 420 /* ------------------------------------------------------------------------- */ 421 /* L1 d-cache */ 422 /* the standard 860 has 128 sets of 16 bytes in 2 ways (= 4 kB) */ 423 /* the 860 P (plus) has 256 sets of 16 bytes in 2 ways (= 8 kB) */ 424 /* call with cache disabled */ 425 426 int checkdcache (void) 427 { 428 volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; 429 volatile memctl8xx_t *memctl = &immap->im_memctl; 430 u32 cacheon = rd_dc_cst () & IDC_ENABLED; 431 432 #ifdef CONFIG_IP86x 433 u32 k = memctl->memc_br1 & ~0x00007fff; /* probe in flash memoryarea */ 434 #else 435 u32 k = memctl->memc_br0 & ~0x00007fff; /* probe in flash memoryarea */ 436 #endif 437 u32 m; 438 u32 lines = -1; 439 440 wr_dc_cst (IDC_UNALL); 441 wr_dc_cst (IDC_INVALL); 442 wr_dc_cst (IDC_DISABLE); 443 444 while (!((m = rd_dc_cst ()) & IDC_CERR2)) { 445 wr_dc_adr (k); 446 wr_dc_cst (IDC_LDLCK); 447 lines++; 448 k += 0x10; /* the number of bytes in a cacheline */ 449 } 450 451 wr_dc_cst (IDC_UNALL); 452 wr_dc_cst (IDC_INVALL); 453 454 if (cacheon) 455 wr_dc_cst (IDC_ENABLE); 456 else 457 wr_dc_cst (IDC_DISABLE); 458 459 return lines << 4; 460 }; 461 462 /* ------------------------------------------------------------------------- */ 463 464 void upmconfig (uint upm, uint * table, uint size) 465 { 466 uint i; 467 uint addr = 0; 468 volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; 469 volatile memctl8xx_t *memctl = &immap->im_memctl; 470 471 for (i = 0; i < size; i++) { 472 memctl->memc_mdr = table[i]; /* (16-15) */ 473 memctl->memc_mcr = addr | upm; /* (16-16) */ 474 addr++; 475 } 476 } 477 478 /* ------------------------------------------------------------------------- */ 479 480 #ifndef CONFIG_LWMON 481 482 int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 483 { 484 ulong msr, addr; 485 486 volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; 487 488 immap->im_clkrst.car_plprcr |= PLPRCR_CSR; /* Checkstop Reset enable */ 489 490 /* Interrupts and MMU off */ 491 __asm__ volatile ("mtspr 81, 0"); 492 __asm__ volatile ("mfmsr %0":"=r" (msr)); 493 494 msr &= ~0x1030; 495 __asm__ volatile ("mtmsr %0"::"r" (msr)); 496 497 /* 498 * Trying to execute the next instruction at a non-existing address 499 * should cause a machine check, resulting in reset 500 */ 501 #ifdef CONFIG_SYS_RESET_ADDRESS 502 addr = CONFIG_SYS_RESET_ADDRESS; 503 #else 504 /* 505 * note: when CONFIG_SYS_MONITOR_BASE points to a RAM address, CONFIG_SYS_MONITOR_BASE 506 * - sizeof (ulong) is usually a valid address. Better pick an address 507 * known to be invalid on your system and assign it to CONFIG_SYS_RESET_ADDRESS. 508 * "(ulong)-1" used to be a good choice for many systems... 509 */ 510 addr = CONFIG_SYS_MONITOR_BASE - sizeof (ulong); 511 #endif 512 ((void (*)(void)) addr) (); 513 return 1; 514 } 515 516 #else /* CONFIG_LWMON */ 517 518 /* 519 * On the LWMON board, the MCLR reset input of the PIC's on the board 520 * uses a 47K/1n RC combination which has a 47us time constant. The 521 * low signal on the HRESET pin of the CPU is only 512 clocks = 8 us 522 * and thus too short to reset the external hardware. So we use the 523 * watchdog to reset the board. 524 */ 525 int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 526 { 527 /* prevent triggering the watchdog */ 528 disable_interrupts (); 529 530 /* make sure the watchdog is running */ 531 reset_8xx_watchdog ((immap_t *) CONFIG_SYS_IMMR); 532 533 /* wait for watchdog reset */ 534 while (1) {}; 535 536 /* NOTREACHED */ 537 return 1; 538 } 539 540 #endif /* CONFIG_LWMON */ 541 542 /* ------------------------------------------------------------------------- */ 543 544 /* 545 * Get timebase clock frequency (like cpu_clk in Hz) 546 * 547 * See sections 14.2 and 14.6 of the User's Manual 548 */ 549 unsigned long get_tbclk (void) 550 { 551 uint immr = get_immr (0); /* Return full IMMR contents */ 552 volatile immap_t *immap = (volatile immap_t *)(immr & 0xFFFF0000); 553 ulong oscclk, factor, pll; 554 555 if (immap->im_clkrst.car_sccr & SCCR_TBS) { 556 return (gd->cpu_clk / 16); 557 } 558 559 pll = immap->im_clkrst.car_plprcr; 560 561 #define PLPRCR_val(a) ((pll & PLPRCR_ ## a ## _MSK) >> PLPRCR_ ## a ## _SHIFT) 562 563 /* 564 * For newer PQ1 chips (MPC866/87x/88x families), PLL multiplication 565 * factor is calculated as follows: 566 * 567 * MFN 568 * MFI + ------- 569 * MFD + 1 570 * factor = ----------------- 571 * (PDF + 1) * 2^S 572 * 573 * For older chips, it's just MF field of PLPRCR plus one. 574 */ 575 if ((immr & 0x0FFF) >= MPC8xx_NEW_CLK) { /* MPC866/87x/88x series */ 576 factor = (PLPRCR_val(MFI) + PLPRCR_val(MFN)/(PLPRCR_val(MFD)+1))/ 577 (PLPRCR_val(PDF)+1) / (1<<PLPRCR_val(S)); 578 } else { 579 factor = PLPRCR_val(MF)+1; 580 } 581 582 oscclk = gd->cpu_clk / factor; 583 584 if ((immap->im_clkrst.car_sccr & SCCR_RTSEL) == 0 || factor > 2) { 585 return (oscclk / 4); 586 } 587 return (oscclk / 16); 588 } 589 590 /* ------------------------------------------------------------------------- */ 591 592 #if defined(CONFIG_WATCHDOG) 593 void watchdog_reset (void) 594 { 595 int re_enable = disable_interrupts (); 596 597 reset_8xx_watchdog ((immap_t *) CONFIG_SYS_IMMR); 598 if (re_enable) 599 enable_interrupts (); 600 } 601 #endif /* CONFIG_WATCHDOG */ 602 603 #if defined(CONFIG_WATCHDOG) || defined(CONFIG_LWMON) 604 605 void reset_8xx_watchdog (volatile immap_t * immr) 606 { 607 # if defined(CONFIG_LWMON) 608 /* 609 * The LWMON board uses a MAX6301 Watchdog 610 * with the trigger pin connected to port PA.7 611 * 612 * (The old board version used a MAX706TESA Watchdog, which 613 * had to be handled exactly the same.) 614 */ 615 # define WATCHDOG_BIT 0x0100 616 immr->im_ioport.iop_papar &= ~(WATCHDOG_BIT); /* GPIO */ 617 immr->im_ioport.iop_padir |= WATCHDOG_BIT; /* Output */ 618 immr->im_ioport.iop_paodr &= ~(WATCHDOG_BIT); /* active output */ 619 620 immr->im_ioport.iop_padat ^= WATCHDOG_BIT; /* Toggle WDI */ 621 # elif defined(CONFIG_KUP4K) || defined(CONFIG_KUP4X) 622 /* 623 * The KUP4 boards uses a TPS3705 Watchdog 624 * with the trigger pin connected to port PA.5 625 */ 626 # define WATCHDOG_BIT 0x0400 627 immr->im_ioport.iop_papar &= ~(WATCHDOG_BIT); /* GPIO */ 628 immr->im_ioport.iop_padir |= WATCHDOG_BIT; /* Output */ 629 immr->im_ioport.iop_paodr &= ~(WATCHDOG_BIT); /* active output */ 630 631 immr->im_ioport.iop_padat ^= WATCHDOG_BIT; /* Toggle WDI */ 632 # else 633 /* 634 * All other boards use the MPC8xx Internal Watchdog 635 */ 636 immr->im_siu_conf.sc_swsr = 0x556c; /* write magic1 */ 637 immr->im_siu_conf.sc_swsr = 0xaa39; /* write magic2 */ 638 # endif /* CONFIG_LWMON */ 639 } 640 #endif /* CONFIG_WATCHDOG */ 641 642 /* 643 * Initializes on-chip ethernet controllers. 644 * to override, implement board_eth_init() 645 */ 646 int cpu_eth_init(bd_t *bis) 647 { 648 #if defined(SCC_ENET) && defined(CONFIG_CMD_NET) 649 scc_initialize(bis); 650 #endif 651 #if defined(FEC_ENET) 652 fec_initialize(bis); 653 #endif 654 return 0; 655 } 656