1 /* 2 * (C) Copyright 2000-2002 3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 /* 9 * m8xx.c 10 * 11 * CPU specific code 12 * 13 * written or collected and sometimes rewritten by 14 * Magnus Damm <damm@bitsmart.com> 15 * 16 * minor modifications by 17 * Wolfgang Denk <wd@denx.de> 18 */ 19 20 #include <common.h> 21 #include <watchdog.h> 22 #include <command.h> 23 #include <mpc8xx.h> 24 #include <commproc.h> 25 #include <netdev.h> 26 #include <asm/cache.h> 27 #include <linux/compiler.h> 28 #include <asm/io.h> 29 30 #if defined(CONFIG_OF_LIBFDT) 31 #include <libfdt.h> 32 #include <fdt_support.h> 33 #endif 34 35 DECLARE_GLOBAL_DATA_PTR; 36 37 static char *cpu_warning = "\n " \ 38 "*** Warning: CPU Core has Silicon Bugs -- Check the Errata ***"; 39 40 #if ((defined(CONFIG_MPC86x) || defined(CONFIG_MPC855)) && \ 41 !defined(CONFIG_MPC862)) 42 43 static int check_CPU (long clock, uint pvr, uint immr) 44 { 45 char *id_str = 46 # if defined(CONFIG_MPC855) 47 "PC855"; 48 # elif defined(CONFIG_MPC860P) 49 "PC860P"; 50 # else 51 NULL; 52 # endif 53 volatile immap_t *immap = (immap_t *) (immr & 0xFFFF0000); 54 uint k, m; 55 char buf[32]; 56 char pre = 'X'; 57 char *mid = "xx"; 58 char *suf; 59 60 /* the highest 16 bits should be 0x0050 for a 860 */ 61 62 if ((pvr >> 16) != 0x0050) 63 return -1; 64 65 k = (immr << 16) | 66 immap->im_cpm.cp_dparam16[PROFF_REVNUM / sizeof(u16)]; 67 m = 0; 68 suf = ""; 69 70 /* 71 * Some boards use sockets so different CPUs can be used. 72 * We have to check chip version in run time. 73 */ 74 switch (k) { 75 case 0x00020001: pre = 'P'; break; 76 case 0x00030001: break; 77 case 0x00120003: suf = "A"; break; 78 case 0x00130003: suf = "A3"; break; 79 80 case 0x00200004: suf = "B"; break; 81 82 case 0x00300004: suf = "C"; break; 83 case 0x00310004: suf = "C1"; m = 1; break; 84 85 case 0x00200064: mid = "SR"; suf = "B"; break; 86 case 0x00300065: mid = "SR"; suf = "C"; break; 87 case 0x00310065: mid = "SR"; suf = "C1"; m = 1; break; 88 case 0x05010000: suf = "D3"; m = 1; break; 89 case 0x05020000: suf = "D4"; m = 1; break; 90 /* this value is not documented anywhere */ 91 case 0x40000000: pre = 'P'; suf = "D"; m = 1; break; 92 /* MPC866P/MPC866T/MPC859T/MPC859DSL/MPC852T */ 93 case 0x08010004: /* Rev. A.0 */ 94 suf = "A"; 95 /* fall through */ 96 case 0x08000003: /* Rev. 0.3 */ 97 pre = 'M'; m = 1; 98 if (id_str == NULL) 99 id_str = 100 # if defined(CONFIG_MPC859T) 101 "PC859T"; 102 # else 103 "PC866x"; /* Unknown chip from MPC866 family */ 104 # endif 105 break; 106 case 0x09000000: pre = 'M'; mid = suf = ""; m = 1; 107 if (id_str == NULL) 108 id_str = "PC885"; /* 870/875/880/885 */ 109 break; 110 111 default: suf = NULL; break; 112 } 113 114 if (id_str == NULL) 115 id_str = "PC86x"; /* Unknown 86x chip */ 116 if (suf) 117 printf ("%c%s%sZPnn%s", pre, id_str, mid, suf); 118 else 119 printf ("unknown M%s (0x%08x)", id_str, k); 120 121 122 #if defined(CONFIG_SYS_8xx_CPUCLK_MIN) && defined(CONFIG_SYS_8xx_CPUCLK_MAX) 123 printf (" at %s MHz [%d.%d...%d.%d MHz]\n ", 124 strmhz (buf, clock), 125 CONFIG_SYS_8xx_CPUCLK_MIN / 1000000, 126 ((CONFIG_SYS_8xx_CPUCLK_MIN % 1000000) + 50000) / 100000, 127 CONFIG_SYS_8xx_CPUCLK_MAX / 1000000, 128 ((CONFIG_SYS_8xx_CPUCLK_MAX % 1000000) + 50000) / 100000 129 ); 130 #else 131 printf (" at %s MHz: ", strmhz (buf, clock)); 132 #endif 133 print_size(checkicache(), " I-Cache "); 134 print_size(checkdcache(), " D-Cache"); 135 136 /* do we have a FEC (860T/P or 852/859/866/885)? */ 137 138 immap->im_cpm.cp_fec.fec_addr_low = 0x12345678; 139 if (immap->im_cpm.cp_fec.fec_addr_low == 0x12345678) { 140 printf (" FEC present"); 141 } 142 143 if (!m) { 144 puts (cpu_warning); 145 } 146 147 putc ('\n'); 148 149 #ifdef DEBUG 150 if(clock != measure_gclk()) { 151 printf ("clock %ldHz != %dHz\n", clock, measure_gclk()); 152 } 153 #endif 154 155 return 0; 156 } 157 158 #elif defined(CONFIG_MPC862) 159 160 static int check_CPU (long clock, uint pvr, uint immr) 161 { 162 volatile immap_t *immap = (immap_t *) (immr & 0xFFFF0000); 163 uint k, m; 164 char buf[32]; 165 char pre = 'X'; 166 __maybe_unused char *mid = "xx"; 167 char *suf; 168 169 /* the highest 16 bits should be 0x0050 for a 8xx */ 170 171 if ((pvr >> 16) != 0x0050) 172 return -1; 173 174 k = (immr << 16) | 175 immap->im_cpm.cp_dparam16[PROFF_REVNUM / sizeof(u16)]; 176 m = 0; 177 178 switch (k) { 179 180 /* this value is not documented anywhere */ 181 case 0x06000000: mid = "P"; suf = "0"; break; 182 case 0x06010001: mid = "P"; suf = "A"; m = 1; break; 183 case 0x07000003: mid = "P"; suf = "B"; m = 1; break; 184 default: suf = NULL; break; 185 } 186 187 #ifndef CONFIG_MPC857 188 if (suf) 189 printf ("%cPC862%sZPnn%s", pre, mid, suf); 190 else 191 printf ("unknown MPC862 (0x%08x)", k); 192 #else 193 if (suf) 194 printf ("%cPC857TZPnn%s", pre, suf); /* only 857T tested right now! */ 195 else 196 printf ("unknown MPC857 (0x%08x)", k); 197 #endif 198 199 printf(" at %s MHz: ", strmhz(buf, clock)); 200 201 print_size(checkicache(), " I-Cache "); 202 print_size(checkdcache(), " D-Cache"); 203 204 /* lets check and see if we're running on a 862T (or P?) */ 205 206 immap->im_cpm.cp_fec.fec_addr_low = 0x12345678; 207 if (immap->im_cpm.cp_fec.fec_addr_low == 0x12345678) { 208 printf (" FEC present"); 209 } 210 211 if (!m) { 212 puts (cpu_warning); 213 } 214 215 putc ('\n'); 216 217 return 0; 218 } 219 220 #elif defined(CONFIG_MPC823) 221 222 static int check_CPU (long clock, uint pvr, uint immr) 223 { 224 volatile immap_t *immap = (immap_t *) (immr & 0xFFFF0000); 225 uint k, m; 226 char buf[32]; 227 char *suf; 228 229 /* the highest 16 bits should be 0x0050 for a 8xx */ 230 231 if ((pvr >> 16) != 0x0050) 232 return -1; 233 234 k = (immr << 16) | 235 in_be16(&immap->im_cpm.cp_dparam16[PROFF_REVNUM / sizeof(u16)]); 236 m = 0; 237 238 switch (k) { 239 /* MPC823 */ 240 case 0x20000000: suf = "0"; break; 241 case 0x20010000: suf = "0.1"; break; 242 case 0x20020000: suf = "Z2/3"; break; 243 case 0x20020001: suf = "Z3"; break; 244 case 0x21000000: suf = "A"; break; 245 case 0x21010000: suf = "B"; m = 1; break; 246 case 0x21010001: suf = "B2"; m = 1; break; 247 /* MPC823E */ 248 case 0x24010000: suf = NULL; 249 puts ("PPC823EZTnnB2"); 250 m = 1; 251 break; 252 default: 253 suf = NULL; 254 printf ("unknown MPC823 (0x%08x)", k); 255 break; 256 } 257 if (suf) 258 printf ("PPC823ZTnn%s", suf); 259 260 printf(" at %s MHz: ", strmhz(buf, clock)); 261 262 print_size(checkicache(), " I-Cache "); 263 print_size(checkdcache(), " D-Cache"); 264 265 /* lets check and see if we're running on a 860T (or P?) */ 266 267 immap->im_cpm.cp_fec.fec_addr_low = 0x12345678; 268 if (immap->im_cpm.cp_fec.fec_addr_low == 0x12345678) { 269 puts (" FEC present"); 270 } 271 272 if (!m) { 273 puts (cpu_warning); 274 } 275 276 putc ('\n'); 277 278 return 0; 279 } 280 281 #elif defined(CONFIG_MPC850) 282 283 static int check_CPU (long clock, uint pvr, uint immr) 284 { 285 volatile immap_t *immap = (immap_t *) (immr & 0xFFFF0000); 286 uint k, m; 287 char buf[32]; 288 289 /* the highest 16 bits should be 0x0050 for a 8xx */ 290 291 if ((pvr >> 16) != 0x0050) 292 return -1; 293 294 k = (immr << 16) | 295 immap->im_cpm.cp_dparam16[PROFF_REVNUM / sizeof(u16)]; 296 m = 0; 297 298 switch (k) { 299 case 0x20020001: 300 printf ("XPC850xxZT"); 301 break; 302 case 0x21000065: 303 printf ("XPC850xxZTA"); 304 break; 305 case 0x21010067: 306 printf ("XPC850xxZTB"); 307 m = 1; 308 break; 309 case 0x21020068: 310 printf ("XPC850xxZTC"); 311 m = 1; 312 break; 313 default: 314 printf ("unknown MPC850 (0x%08x)", k); 315 } 316 printf(" at %s MHz: ", strmhz(buf, clock)); 317 318 print_size(checkicache(), " I-Cache "); 319 print_size(checkdcache(), " D-Cache"); 320 321 /* lets check and see if we're running on a 850T (or P?) */ 322 323 immap->im_cpm.cp_fec.fec_addr_low = 0x12345678; 324 if (immap->im_cpm.cp_fec.fec_addr_low == 0x12345678) { 325 printf (" FEC present"); 326 } 327 328 if (!m) { 329 puts (cpu_warning); 330 } 331 332 putc ('\n'); 333 334 return 0; 335 } 336 #else 337 #error CPU undefined 338 #endif 339 /* ------------------------------------------------------------------------- */ 340 341 int checkcpu (void) 342 { 343 ulong clock = gd->cpu_clk; 344 uint immr = get_immr (0); /* Return full IMMR contents */ 345 uint pvr = get_pvr (); 346 347 puts ("CPU: "); 348 349 /* 850 has PARTNUM 20 */ 350 /* 801 has PARTNUM 10 */ 351 return check_CPU (clock, pvr, immr); 352 } 353 354 /* ------------------------------------------------------------------------- */ 355 /* L1 i-cache */ 356 /* the standard 860 has 128 sets of 16 bytes in 2 ways (= 4 kB) */ 357 /* the 860 P (plus) has 256 sets of 16 bytes in 4 ways (= 16 kB) */ 358 359 int checkicache (void) 360 { 361 volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; 362 volatile memctl8xx_t *memctl = &immap->im_memctl; 363 u32 cacheon = rd_ic_cst () & IDC_ENABLED; 364 365 #ifdef CONFIG_IP86x 366 u32 k = memctl->memc_br1 & ~0x00007fff; /* probe in flash memoryarea */ 367 #else 368 u32 k = memctl->memc_br0 & ~0x00007fff; /* probe in flash memoryarea */ 369 #endif 370 u32 m; 371 u32 lines = -1; 372 373 wr_ic_cst (IDC_UNALL); 374 wr_ic_cst (IDC_INVALL); 375 wr_ic_cst (IDC_DISABLE); 376 __asm__ volatile ("isync"); 377 378 while (!((m = rd_ic_cst ()) & IDC_CERR2)) { 379 wr_ic_adr (k); 380 wr_ic_cst (IDC_LDLCK); 381 __asm__ volatile ("isync"); 382 383 lines++; 384 k += 0x10; /* the number of bytes in a cacheline */ 385 } 386 387 wr_ic_cst (IDC_UNALL); 388 wr_ic_cst (IDC_INVALL); 389 390 if (cacheon) 391 wr_ic_cst (IDC_ENABLE); 392 else 393 wr_ic_cst (IDC_DISABLE); 394 395 __asm__ volatile ("isync"); 396 397 return lines << 4; 398 }; 399 400 /* ------------------------------------------------------------------------- */ 401 /* L1 d-cache */ 402 /* the standard 860 has 128 sets of 16 bytes in 2 ways (= 4 kB) */ 403 /* the 860 P (plus) has 256 sets of 16 bytes in 2 ways (= 8 kB) */ 404 /* call with cache disabled */ 405 406 int checkdcache (void) 407 { 408 volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; 409 volatile memctl8xx_t *memctl = &immap->im_memctl; 410 u32 cacheon = rd_dc_cst () & IDC_ENABLED; 411 412 #ifdef CONFIG_IP86x 413 u32 k = memctl->memc_br1 & ~0x00007fff; /* probe in flash memoryarea */ 414 #else 415 u32 k = memctl->memc_br0 & ~0x00007fff; /* probe in flash memoryarea */ 416 #endif 417 u32 m; 418 u32 lines = -1; 419 420 wr_dc_cst (IDC_UNALL); 421 wr_dc_cst (IDC_INVALL); 422 wr_dc_cst (IDC_DISABLE); 423 424 while (!((m = rd_dc_cst ()) & IDC_CERR2)) { 425 wr_dc_adr (k); 426 wr_dc_cst (IDC_LDLCK); 427 lines++; 428 k += 0x10; /* the number of bytes in a cacheline */ 429 } 430 431 wr_dc_cst (IDC_UNALL); 432 wr_dc_cst (IDC_INVALL); 433 434 if (cacheon) 435 wr_dc_cst (IDC_ENABLE); 436 else 437 wr_dc_cst (IDC_DISABLE); 438 439 return lines << 4; 440 }; 441 442 /* ------------------------------------------------------------------------- */ 443 444 void upmconfig (uint upm, uint * table, uint size) 445 { 446 uint i; 447 uint addr = 0; 448 volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; 449 volatile memctl8xx_t *memctl = &immap->im_memctl; 450 451 for (i = 0; i < size; i++) { 452 memctl->memc_mdr = table[i]; /* (16-15) */ 453 memctl->memc_mcr = addr | upm; /* (16-16) */ 454 addr++; 455 } 456 } 457 458 /* ------------------------------------------------------------------------- */ 459 460 #ifndef CONFIG_LWMON 461 462 int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 463 { 464 ulong msr, addr; 465 466 volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; 467 468 immap->im_clkrst.car_plprcr |= PLPRCR_CSR; /* Checkstop Reset enable */ 469 470 /* Interrupts and MMU off */ 471 __asm__ volatile ("mtspr 81, 0"); 472 __asm__ volatile ("mfmsr %0":"=r" (msr)); 473 474 msr &= ~0x1030; 475 __asm__ volatile ("mtmsr %0"::"r" (msr)); 476 477 /* 478 * Trying to execute the next instruction at a non-existing address 479 * should cause a machine check, resulting in reset 480 */ 481 #ifdef CONFIG_SYS_RESET_ADDRESS 482 addr = CONFIG_SYS_RESET_ADDRESS; 483 #else 484 /* 485 * note: when CONFIG_SYS_MONITOR_BASE points to a RAM address, CONFIG_SYS_MONITOR_BASE 486 * - sizeof (ulong) is usually a valid address. Better pick an address 487 * known to be invalid on your system and assign it to CONFIG_SYS_RESET_ADDRESS. 488 * "(ulong)-1" used to be a good choice for many systems... 489 */ 490 addr = CONFIG_SYS_MONITOR_BASE - sizeof (ulong); 491 #endif 492 ((void (*)(void)) addr) (); 493 return 1; 494 } 495 496 #else /* CONFIG_LWMON */ 497 498 /* 499 * On the LWMON board, the MCLR reset input of the PIC's on the board 500 * uses a 47K/1n RC combination which has a 47us time constant. The 501 * low signal on the HRESET pin of the CPU is only 512 clocks = 8 us 502 * and thus too short to reset the external hardware. So we use the 503 * watchdog to reset the board. 504 */ 505 int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 506 { 507 /* prevent triggering the watchdog */ 508 disable_interrupts (); 509 510 /* make sure the watchdog is running */ 511 reset_8xx_watchdog ((immap_t *) CONFIG_SYS_IMMR); 512 513 /* wait for watchdog reset */ 514 while (1) {}; 515 516 /* NOTREACHED */ 517 return 1; 518 } 519 520 #endif /* CONFIG_LWMON */ 521 522 /* ------------------------------------------------------------------------- */ 523 524 /* 525 * Get timebase clock frequency (like cpu_clk in Hz) 526 * 527 * See sections 14.2 and 14.6 of the User's Manual 528 */ 529 unsigned long get_tbclk (void) 530 { 531 uint immr = get_immr (0); /* Return full IMMR contents */ 532 volatile immap_t *immap = (volatile immap_t *)(immr & 0xFFFF0000); 533 ulong oscclk, factor, pll; 534 535 if (immap->im_clkrst.car_sccr & SCCR_TBS) { 536 return (gd->cpu_clk / 16); 537 } 538 539 pll = immap->im_clkrst.car_plprcr; 540 541 #define PLPRCR_val(a) ((pll & PLPRCR_ ## a ## _MSK) >> PLPRCR_ ## a ## _SHIFT) 542 543 /* 544 * For newer PQ1 chips (MPC866/87x/88x families), PLL multiplication 545 * factor is calculated as follows: 546 * 547 * MFN 548 * MFI + ------- 549 * MFD + 1 550 * factor = ----------------- 551 * (PDF + 1) * 2^S 552 * 553 * For older chips, it's just MF field of PLPRCR plus one. 554 */ 555 if ((immr & 0x0FFF) >= MPC8xx_NEW_CLK) { /* MPC866/87x/88x series */ 556 factor = (PLPRCR_val(MFI) + PLPRCR_val(MFN)/(PLPRCR_val(MFD)+1))/ 557 (PLPRCR_val(PDF)+1) / (1<<PLPRCR_val(S)); 558 } else { 559 factor = PLPRCR_val(MF)+1; 560 } 561 562 oscclk = gd->cpu_clk / factor; 563 564 if ((immap->im_clkrst.car_sccr & SCCR_RTSEL) == 0 || factor > 2) { 565 return (oscclk / 4); 566 } 567 return (oscclk / 16); 568 } 569 570 /* ------------------------------------------------------------------------- */ 571 572 #if defined(CONFIG_WATCHDOG) 573 void watchdog_reset (void) 574 { 575 int re_enable = disable_interrupts (); 576 577 reset_8xx_watchdog ((immap_t *) CONFIG_SYS_IMMR); 578 if (re_enable) 579 enable_interrupts (); 580 } 581 #endif /* CONFIG_WATCHDOG */ 582 583 #if defined(CONFIG_WATCHDOG) || defined(CONFIG_LWMON) 584 585 void reset_8xx_watchdog (volatile immap_t * immr) 586 { 587 # if defined(CONFIG_LWMON) 588 /* 589 * The LWMON board uses a MAX6301 Watchdog 590 * with the trigger pin connected to port PA.7 591 * 592 * (The old board version used a MAX706TESA Watchdog, which 593 * had to be handled exactly the same.) 594 */ 595 # define WATCHDOG_BIT 0x0100 596 immr->im_ioport.iop_papar &= ~(WATCHDOG_BIT); /* GPIO */ 597 immr->im_ioport.iop_padir |= WATCHDOG_BIT; /* Output */ 598 immr->im_ioport.iop_paodr &= ~(WATCHDOG_BIT); /* active output */ 599 600 immr->im_ioport.iop_padat ^= WATCHDOG_BIT; /* Toggle WDI */ 601 # elif defined(CONFIG_KUP4K) || defined(CONFIG_KUP4X) 602 /* 603 * The KUP4 boards uses a TPS3705 Watchdog 604 * with the trigger pin connected to port PA.5 605 */ 606 # define WATCHDOG_BIT 0x0400 607 immr->im_ioport.iop_papar &= ~(WATCHDOG_BIT); /* GPIO */ 608 immr->im_ioport.iop_padir |= WATCHDOG_BIT; /* Output */ 609 immr->im_ioport.iop_paodr &= ~(WATCHDOG_BIT); /* active output */ 610 611 immr->im_ioport.iop_padat ^= WATCHDOG_BIT; /* Toggle WDI */ 612 # else 613 /* 614 * All other boards use the MPC8xx Internal Watchdog 615 */ 616 immr->im_siu_conf.sc_swsr = 0x556c; /* write magic1 */ 617 immr->im_siu_conf.sc_swsr = 0xaa39; /* write magic2 */ 618 # endif /* CONFIG_LWMON */ 619 } 620 #endif /* CONFIG_WATCHDOG */ 621 622 /* 623 * Initializes on-chip ethernet controllers. 624 * to override, implement board_eth_init() 625 */ 626 int cpu_eth_init(bd_t *bis) 627 { 628 #if defined(SCC_ENET) && defined(CONFIG_CMD_NET) 629 scc_initialize(bis); 630 #endif 631 #if defined(FEC_ENET) 632 fec_initialize(bis); 633 #endif 634 return 0; 635 } 636