1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2006-2007 Freescale Semiconductor, Inc. 4 * 5 * (C) Copyright 2006 6 * Wolfgang Denk, DENX Software Engineering, wd (at) denx.de. 7 * 8 * Copyright (C) 2004-2006 Freescale Semiconductor, Inc. 9 * (C) Copyright 2003 Motorola Inc. 10 * Xianghua Xiao (X.Xiao (at) motorola.com) 11 */ 12 13 #include <common.h> 14 #include <asm/processor.h> 15 #include <asm/io.h> 16 #include <i2c.h> 17 #include <spd.h> 18 #include <asm/mmu.h> 19 #include <spd_sdram.h> 20 21 DECLARE_GLOBAL_DATA_PTR; 22 23 void board_add_ram_info(int use_default) 24 { 25 volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; 26 volatile ddr83xx_t *ddr = &immap->ddr; 27 char buf[32]; 28 29 printf(" (DDR%d", ((ddr->sdram_cfg & SDRAM_CFG_SDRAM_TYPE_MASK) 30 >> SDRAM_CFG_SDRAM_TYPE_SHIFT) - 1); 31 32 #if defined(CONFIG_MPC8308) || defined(CONFIG_MPC831x) 33 if ((ddr->sdram_cfg & SDRAM_CFG_DBW_MASK) == SDRAM_CFG_DBW_16) 34 puts(", 16-bit"); 35 else if ((ddr->sdram_cfg & SDRAM_CFG_DBW_MASK) == SDRAM_CFG_DBW_32) 36 puts(", 32-bit"); 37 else 38 puts(", unknown width"); 39 #else 40 if (ddr->sdram_cfg & SDRAM_CFG_32_BE) 41 puts(", 32-bit"); 42 else 43 puts(", 64-bit"); 44 #endif 45 46 if (ddr->sdram_cfg & SDRAM_CFG_ECC_EN) 47 puts(", ECC on"); 48 else 49 puts(", ECC off"); 50 51 printf(", %s MHz)", strmhz(buf, gd->mem_clk)); 52 53 #if defined(CONFIG_SYS_LB_SDRAM) && defined(CONFIG_SYS_LBC_SDRAM_SIZE) 54 puts("\nSDRAM: "); 55 print_size (CONFIG_SYS_LBC_SDRAM_SIZE * 1024 * 1024, " (local bus)"); 56 #endif 57 } 58 59 #ifdef CONFIG_SPD_EEPROM 60 #ifndef CONFIG_SYS_READ_SPD 61 #define CONFIG_SYS_READ_SPD i2c_read 62 #endif 63 #ifndef SPD_EEPROM_OFFSET 64 #define SPD_EEPROM_OFFSET 0 65 #endif 66 #ifndef SPD_EEPROM_ADDR_LEN 67 #define SPD_EEPROM_ADDR_LEN 1 68 #endif 69 70 /* 71 * Convert picoseconds into clock cycles (rounding up if needed). 72 */ 73 int 74 picos_to_clk(int picos) 75 { 76 unsigned int mem_bus_clk; 77 int clks; 78 79 mem_bus_clk = gd->mem_clk >> 1; 80 clks = picos / (1000000000 / (mem_bus_clk / 1000)); 81 if (picos % (1000000000 / (mem_bus_clk / 1000)) != 0) 82 clks++; 83 84 return clks; 85 } 86 87 unsigned int banksize(unsigned char row_dens) 88 { 89 return ((row_dens >> 2) | ((row_dens & 3) << 6)) << 24; 90 } 91 92 int read_spd(uint addr) 93 { 94 return ((int) addr); 95 } 96 97 #undef SPD_DEBUG 98 #ifdef SPD_DEBUG 99 static void spd_debug(spd_eeprom_t *spd) 100 { 101 printf ("\nDIMM type: %-18.18s\n", spd->mpart); 102 printf ("SPD size: %d\n", spd->info_size); 103 printf ("EEPROM size: %d\n", 1 << spd->chip_size); 104 printf ("Memory type: %d\n", spd->mem_type); 105 printf ("Row addr: %d\n", spd->nrow_addr); 106 printf ("Column addr: %d\n", spd->ncol_addr); 107 printf ("# of rows: %d\n", spd->nrows); 108 printf ("Row density: %d\n", spd->row_dens); 109 printf ("# of banks: %d\n", spd->nbanks); 110 printf ("Data width: %d\n", 111 256 * spd->dataw_msb + spd->dataw_lsb); 112 printf ("Chip width: %d\n", spd->primw); 113 printf ("Refresh rate: %02X\n", spd->refresh); 114 printf ("CAS latencies: %02X\n", spd->cas_lat); 115 printf ("Write latencies: %02X\n", spd->write_lat); 116 printf ("tRP: %d\n", spd->trp); 117 printf ("tRCD: %d\n", spd->trcd); 118 printf ("\n"); 119 } 120 #endif /* SPD_DEBUG */ 121 122 long int spd_sdram() 123 { 124 volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR; 125 volatile ddr83xx_t *ddr = &immap->ddr; 126 volatile law83xx_t *ecm = &immap->sysconf.ddrlaw[0]; 127 spd_eeprom_t spd; 128 unsigned int n_ranks; 129 unsigned int odt_rd_cfg, odt_wr_cfg; 130 unsigned char twr_clk, twtr_clk; 131 unsigned int sdram_type; 132 unsigned int memsize; 133 unsigned int law_size; 134 unsigned char caslat, caslat_ctrl; 135 unsigned int trfc, trfc_clk, trfc_low; 136 unsigned int trcd_clk, trtp_clk; 137 unsigned char cke_min_clk; 138 unsigned char add_lat, wr_lat; 139 unsigned char wr_data_delay; 140 unsigned char four_act; 141 unsigned char cpo; 142 unsigned char burstlen; 143 unsigned char odt_cfg, mode_odt_enable; 144 unsigned int max_bus_clk; 145 unsigned int max_data_rate, effective_data_rate; 146 unsigned int ddrc_clk; 147 unsigned int refresh_clk; 148 unsigned int sdram_cfg; 149 unsigned int ddrc_ecc_enable; 150 unsigned int pvr = get_pvr(); 151 152 /* 153 * First disable the memory controller (could be enabled 154 * by the debugger) 155 */ 156 clrsetbits_be32(&ddr->sdram_cfg, SDRAM_CFG_MEM_EN, 0); 157 sync(); 158 isync(); 159 160 /* Read SPD parameters with I2C */ 161 CONFIG_SYS_READ_SPD(SPD_EEPROM_ADDRESS, SPD_EEPROM_OFFSET, 162 SPD_EEPROM_ADDR_LEN, (uchar *) &spd, sizeof(spd)); 163 #ifdef SPD_DEBUG 164 spd_debug(&spd); 165 #endif 166 /* Check the memory type */ 167 if (spd.mem_type != SPD_MEMTYPE_DDR && spd.mem_type != SPD_MEMTYPE_DDR2) { 168 debug("DDR: Module mem type is %02X\n", spd.mem_type); 169 return 0; 170 } 171 172 /* Check the number of physical bank */ 173 if (spd.mem_type == SPD_MEMTYPE_DDR) { 174 n_ranks = spd.nrows; 175 } else { 176 n_ranks = (spd.nrows & 0x7) + 1; 177 } 178 179 if (n_ranks > 2) { 180 printf("DDR: The number of physical bank is %02X\n", n_ranks); 181 return 0; 182 } 183 184 /* Check if the number of row of the module is in the range of DDRC */ 185 if (spd.nrow_addr < 12 || spd.nrow_addr > 15) { 186 printf("DDR: Row number is out of range of DDRC, row=%02X\n", 187 spd.nrow_addr); 188 return 0; 189 } 190 191 /* Check if the number of col of the module is in the range of DDRC */ 192 if (spd.ncol_addr < 8 || spd.ncol_addr > 11) { 193 printf("DDR: Col number is out of range of DDRC, col=%02X\n", 194 spd.ncol_addr); 195 return 0; 196 } 197 198 #ifdef CONFIG_SYS_DDRCDR_VALUE 199 /* 200 * Adjust DDR II IO voltage biasing. It just makes it work. 201 */ 202 if(spd.mem_type == SPD_MEMTYPE_DDR2) { 203 immap->sysconf.ddrcdr = CONFIG_SYS_DDRCDR_VALUE; 204 } 205 udelay(50000); 206 #endif 207 208 /* 209 * ODT configuration recommendation from DDR Controller Chapter. 210 */ 211 odt_rd_cfg = 0; /* Never assert ODT */ 212 odt_wr_cfg = 0; /* Never assert ODT */ 213 if (spd.mem_type == SPD_MEMTYPE_DDR2) { 214 odt_wr_cfg = 1; /* Assert ODT on writes to CSn */ 215 } 216 217 /* Setup DDR chip select register */ 218 #ifdef CONFIG_SYS_83XX_DDR_USES_CS0 219 ddr->csbnds[0].csbnds = (banksize(spd.row_dens) >> 24) - 1; 220 ddr->cs_config[0] = ( 1 << 31 221 | (odt_rd_cfg << 20) 222 | (odt_wr_cfg << 16) 223 | ((spd.nbanks == 8 ? 1 : 0) << 14) 224 | ((spd.nrow_addr - 12) << 8) 225 | (spd.ncol_addr - 8) ); 226 debug("\n"); 227 debug("cs0_bnds = 0x%08x\n",ddr->csbnds[0].csbnds); 228 debug("cs0_config = 0x%08x\n",ddr->cs_config[0]); 229 230 if (n_ranks == 2) { 231 ddr->csbnds[1].csbnds = ( (banksize(spd.row_dens) >> 8) 232 | ((banksize(spd.row_dens) >> 23) - 1) ); 233 ddr->cs_config[1] = ( 1<<31 234 | (odt_rd_cfg << 20) 235 | (odt_wr_cfg << 16) 236 | ((spd.nbanks == 8 ? 1 : 0) << 14) 237 | ((spd.nrow_addr - 12) << 8) 238 | (spd.ncol_addr - 8) ); 239 debug("cs1_bnds = 0x%08x\n",ddr->csbnds[1].csbnds); 240 debug("cs1_config = 0x%08x\n",ddr->cs_config[1]); 241 } 242 243 #else 244 ddr->csbnds[2].csbnds = (banksize(spd.row_dens) >> 24) - 1; 245 ddr->cs_config[2] = ( 1 << 31 246 | (odt_rd_cfg << 20) 247 | (odt_wr_cfg << 16) 248 | ((spd.nbanks == 8 ? 1 : 0) << 14) 249 | ((spd.nrow_addr - 12) << 8) 250 | (spd.ncol_addr - 8) ); 251 debug("\n"); 252 debug("cs2_bnds = 0x%08x\n",ddr->csbnds[2].csbnds); 253 debug("cs2_config = 0x%08x\n",ddr->cs_config[2]); 254 255 if (n_ranks == 2) { 256 ddr->csbnds[3].csbnds = ( (banksize(spd.row_dens) >> 8) 257 | ((banksize(spd.row_dens) >> 23) - 1) ); 258 ddr->cs_config[3] = ( 1<<31 259 | (odt_rd_cfg << 20) 260 | (odt_wr_cfg << 16) 261 | ((spd.nbanks == 8 ? 1 : 0) << 14) 262 | ((spd.nrow_addr - 12) << 8) 263 | (spd.ncol_addr - 8) ); 264 debug("cs3_bnds = 0x%08x\n",ddr->csbnds[3].csbnds); 265 debug("cs3_config = 0x%08x\n",ddr->cs_config[3]); 266 } 267 #endif 268 269 /* 270 * Figure out memory size in Megabytes. 271 */ 272 memsize = n_ranks * banksize(spd.row_dens) / 0x100000; 273 274 /* 275 * First supported LAW size is 16M, at LAWAR_SIZE_16M == 23. 276 */ 277 law_size = 19 + __ilog2(memsize); 278 279 /* 280 * Set up LAWBAR for all of DDR. 281 */ 282 ecm->bar = CONFIG_SYS_DDR_SDRAM_BASE & 0xfffff000; 283 ecm->ar = (LAWAR_EN | LAWAR_TRGT_IF_DDR | (LAWAR_SIZE & law_size)); 284 debug("DDR:bar=0x%08x\n", ecm->bar); 285 debug("DDR:ar=0x%08x\n", ecm->ar); 286 287 /* 288 * Find the largest CAS by locating the highest 1 bit 289 * in the spd.cas_lat field. Translate it to a DDR 290 * controller field value: 291 * 292 * CAS Lat DDR I DDR II Ctrl 293 * Clocks SPD Bit SPD Bit Value 294 * ------- ------- ------- ----- 295 * 1.0 0 0001 296 * 1.5 1 0010 297 * 2.0 2 2 0011 298 * 2.5 3 0100 299 * 3.0 4 3 0101 300 * 3.5 5 0110 301 * 4.0 6 4 0111 302 * 4.5 1000 303 * 5.0 5 1001 304 */ 305 caslat = __ilog2(spd.cas_lat); 306 if ((spd.mem_type == SPD_MEMTYPE_DDR) 307 && (caslat > 6)) { 308 printf("DDR I: Invalid SPD CAS Latency: 0x%x.\n", spd.cas_lat); 309 return 0; 310 } else if (spd.mem_type == SPD_MEMTYPE_DDR2 311 && (caslat < 2 || caslat > 5)) { 312 printf("DDR II: Invalid SPD CAS Latency: 0x%x.\n", 313 spd.cas_lat); 314 return 0; 315 } 316 debug("DDR: caslat SPD bit is %d\n", caslat); 317 318 max_bus_clk = 1000 *10 / (((spd.clk_cycle & 0xF0) >> 4) * 10 319 + (spd.clk_cycle & 0x0f)); 320 max_data_rate = max_bus_clk * 2; 321 322 debug("DDR:Module maximum data rate is: %d MHz\n", max_data_rate); 323 324 ddrc_clk = gd->mem_clk / 1000000; 325 effective_data_rate = 0; 326 327 if (max_data_rate >= 460) { /* it is DDR2-800, 667, 533 */ 328 if (spd.cas_lat & 0x08) 329 caslat = 3; 330 else 331 caslat = 4; 332 if (ddrc_clk <= 460 && ddrc_clk > 350) 333 effective_data_rate = 400; 334 else if (ddrc_clk <=350 && ddrc_clk > 280) 335 effective_data_rate = 333; 336 else if (ddrc_clk <= 280 && ddrc_clk > 230) 337 effective_data_rate = 266; 338 else 339 effective_data_rate = 200; 340 } else if (max_data_rate >= 390 && max_data_rate < 460) { /* it is DDR 400 */ 341 if (ddrc_clk <= 460 && ddrc_clk > 350) { 342 /* DDR controller clk at 350~460 */ 343 effective_data_rate = 400; /* 5ns */ 344 caslat = caslat; 345 } else if (ddrc_clk <= 350 && ddrc_clk > 280) { 346 /* DDR controller clk at 280~350 */ 347 effective_data_rate = 333; /* 6ns */ 348 if (spd.clk_cycle2 == 0x60) 349 caslat = caslat - 1; 350 else 351 caslat = caslat; 352 } else if (ddrc_clk <= 280 && ddrc_clk > 230) { 353 /* DDR controller clk at 230~280 */ 354 effective_data_rate = 266; /* 7.5ns */ 355 if (spd.clk_cycle3 == 0x75) 356 caslat = caslat - 2; 357 else if (spd.clk_cycle2 == 0x75) 358 caslat = caslat - 1; 359 else 360 caslat = caslat; 361 } else if (ddrc_clk <= 230 && ddrc_clk > 90) { 362 /* DDR controller clk at 90~230 */ 363 effective_data_rate = 200; /* 10ns */ 364 if (spd.clk_cycle3 == 0xa0) 365 caslat = caslat - 2; 366 else if (spd.clk_cycle2 == 0xa0) 367 caslat = caslat - 1; 368 else 369 caslat = caslat; 370 } 371 } else if (max_data_rate >= 323) { /* it is DDR 333 */ 372 if (ddrc_clk <= 350 && ddrc_clk > 280) { 373 /* DDR controller clk at 280~350 */ 374 effective_data_rate = 333; /* 6ns */ 375 caslat = caslat; 376 } else if (ddrc_clk <= 280 && ddrc_clk > 230) { 377 /* DDR controller clk at 230~280 */ 378 effective_data_rate = 266; /* 7.5ns */ 379 if (spd.clk_cycle2 == 0x75) 380 caslat = caslat - 1; 381 else 382 caslat = caslat; 383 } else if (ddrc_clk <= 230 && ddrc_clk > 90) { 384 /* DDR controller clk at 90~230 */ 385 effective_data_rate = 200; /* 10ns */ 386 if (spd.clk_cycle3 == 0xa0) 387 caslat = caslat - 2; 388 else if (spd.clk_cycle2 == 0xa0) 389 caslat = caslat - 1; 390 else 391 caslat = caslat; 392 } 393 } else if (max_data_rate >= 256) { /* it is DDR 266 */ 394 if (ddrc_clk <= 350 && ddrc_clk > 280) { 395 /* DDR controller clk at 280~350 */ 396 printf("DDR: DDR controller freq is more than " 397 "max data rate of the module\n"); 398 return 0; 399 } else if (ddrc_clk <= 280 && ddrc_clk > 230) { 400 /* DDR controller clk at 230~280 */ 401 effective_data_rate = 266; /* 7.5ns */ 402 caslat = caslat; 403 } else if (ddrc_clk <= 230 && ddrc_clk > 90) { 404 /* DDR controller clk at 90~230 */ 405 effective_data_rate = 200; /* 10ns */ 406 if (spd.clk_cycle2 == 0xa0) 407 caslat = caslat - 1; 408 } 409 } else if (max_data_rate >= 190) { /* it is DDR 200 */ 410 if (ddrc_clk <= 350 && ddrc_clk > 230) { 411 /* DDR controller clk at 230~350 */ 412 printf("DDR: DDR controller freq is more than " 413 "max data rate of the module\n"); 414 return 0; 415 } else if (ddrc_clk <= 230 && ddrc_clk > 90) { 416 /* DDR controller clk at 90~230 */ 417 effective_data_rate = 200; /* 10ns */ 418 caslat = caslat; 419 } 420 } 421 422 debug("DDR:Effective data rate is: %dMHz\n", effective_data_rate); 423 debug("DDR:The MSB 1 of CAS Latency is: %d\n", caslat); 424 425 /* 426 * Errata DDR6 work around: input enable 2 cycles earlier. 427 * including MPC834x Rev1.0/1.1 and MPC8360 Rev1.1/1.2. 428 */ 429 if(PVR_MAJ(pvr) <= 1 && spd.mem_type == SPD_MEMTYPE_DDR){ 430 if (caslat == 2) 431 ddr->debug_reg = 0x201c0000; /* CL=2 */ 432 else if (caslat == 3) 433 ddr->debug_reg = 0x202c0000; /* CL=2.5 */ 434 else if (caslat == 4) 435 ddr->debug_reg = 0x202c0000; /* CL=3.0 */ 436 437 __asm__ __volatile__ ("sync"); 438 439 debug("Errata DDR6 (debug_reg=0x%08x)\n", ddr->debug_reg); 440 } 441 442 /* 443 * Convert caslat clocks to DDR controller value. 444 * Force caslat_ctrl to be DDR Controller field-sized. 445 */ 446 if (spd.mem_type == SPD_MEMTYPE_DDR) { 447 caslat_ctrl = (caslat + 1) & 0x07; 448 } else { 449 caslat_ctrl = (2 * caslat - 1) & 0x0f; 450 } 451 452 debug("DDR: effective data rate is %d MHz\n", effective_data_rate); 453 debug("DDR: caslat SPD bit is %d, controller field is 0x%x\n", 454 caslat, caslat_ctrl); 455 456 /* 457 * Timing Config 0. 458 * Avoid writing for DDR I. 459 */ 460 if (spd.mem_type == SPD_MEMTYPE_DDR2) { 461 unsigned char taxpd_clk = 8; /* By the book. */ 462 unsigned char tmrd_clk = 2; /* By the book. */ 463 unsigned char act_pd_exit = 2; /* Empirical? */ 464 unsigned char pre_pd_exit = 6; /* Empirical? */ 465 466 ddr->timing_cfg_0 = (0 467 | ((act_pd_exit & 0x7) << 20) /* ACT_PD_EXIT */ 468 | ((pre_pd_exit & 0x7) << 16) /* PRE_PD_EXIT */ 469 | ((taxpd_clk & 0xf) << 8) /* ODT_PD_EXIT */ 470 | ((tmrd_clk & 0xf) << 0) /* MRS_CYC */ 471 ); 472 debug("DDR: timing_cfg_0 = 0x%08x\n", ddr->timing_cfg_0); 473 } 474 475 /* 476 * For DDR I, WRREC(Twr) and WRTORD(Twtr) are not in SPD, 477 * use conservative value. 478 * For DDR II, they are bytes 36 and 37, in quarter nanos. 479 */ 480 481 if (spd.mem_type == SPD_MEMTYPE_DDR) { 482 twr_clk = 3; /* Clocks */ 483 twtr_clk = 1; /* Clocks */ 484 } else { 485 twr_clk = picos_to_clk(spd.twr * 250); 486 twtr_clk = picos_to_clk(spd.twtr * 250); 487 if (twtr_clk < 2) 488 twtr_clk = 2; 489 } 490 491 /* 492 * Calculate Trfc, in picos. 493 * DDR I: Byte 42 straight up in ns. 494 * DDR II: Byte 40 and 42 swizzled some, in ns. 495 */ 496 if (spd.mem_type == SPD_MEMTYPE_DDR) { 497 trfc = spd.trfc * 1000; /* up to ps */ 498 } else { 499 unsigned int byte40_table_ps[8] = { 500 0, 501 250, 502 330, 503 500, 504 660, 505 750, 506 0, 507 0 508 }; 509 510 trfc = (((spd.trctrfc_ext & 0x1) * 256) + spd.trfc) * 1000 511 + byte40_table_ps[(spd.trctrfc_ext >> 1) & 0x7]; 512 } 513 trfc_clk = picos_to_clk(trfc); 514 515 /* 516 * Trcd, Byte 29, from quarter nanos to ps and clocks. 517 */ 518 trcd_clk = picos_to_clk(spd.trcd * 250) & 0x7; 519 520 /* 521 * Convert trfc_clk to DDR controller fields. DDR I should 522 * fit in the REFREC field (16-19) of TIMING_CFG_1, but the 523 * 83xx controller has an extended REFREC field of three bits. 524 * The controller automatically adds 8 clocks to this value, 525 * so preadjust it down 8 first before splitting it up. 526 */ 527 trfc_low = (trfc_clk - 8) & 0xf; 528 529 ddr->timing_cfg_1 = 530 (((picos_to_clk(spd.trp * 250) & 0x07) << 28 ) | /* PRETOACT */ 531 ((picos_to_clk(spd.tras * 1000) & 0x0f ) << 24 ) | /* ACTTOPRE */ 532 (trcd_clk << 20 ) | /* ACTTORW */ 533 (caslat_ctrl << 16 ) | /* CASLAT */ 534 (trfc_low << 12 ) | /* REFEC */ 535 ((twr_clk & 0x07) << 8) | /* WRRREC */ 536 ((picos_to_clk(spd.trrd * 250) & 0x07) << 4) | /* ACTTOACT */ 537 ((twtr_clk & 0x07) << 0) /* WRTORD */ 538 ); 539 540 /* 541 * Additive Latency 542 * For DDR I, 0. 543 * For DDR II, with ODT enabled, use "a value" less than ACTTORW, 544 * which comes from Trcd, and also note that: 545 * add_lat + caslat must be >= 4 546 */ 547 add_lat = 0; 548 if (spd.mem_type == SPD_MEMTYPE_DDR2 549 && (odt_wr_cfg || odt_rd_cfg) 550 && (caslat < 4)) { 551 add_lat = 4 - caslat; 552 if ((add_lat + caslat) < 4) { 553 add_lat = 0; 554 } 555 } 556 557 /* 558 * Write Data Delay 559 * Historically 0x2 == 4/8 clock delay. 560 * Empirically, 0x3 == 6/8 clock delay is suggested for DDR I 266. 561 */ 562 wr_data_delay = 2; 563 #ifdef CONFIG_SYS_DDR_WRITE_DATA_DELAY 564 wr_data_delay = CONFIG_SYS_DDR_WRITE_DATA_DELAY; 565 #endif 566 567 /* 568 * Write Latency 569 * Read to Precharge 570 * Minimum CKE Pulse Width. 571 * Four Activate Window 572 */ 573 if (spd.mem_type == SPD_MEMTYPE_DDR) { 574 /* 575 * This is a lie. It should really be 1, but if it is 576 * set to 1, bits overlap into the old controller's 577 * otherwise unused ACSM field. If we leave it 0, then 578 * the HW will magically treat it as 1 for DDR 1. Oh Yea. 579 */ 580 wr_lat = 0; 581 582 trtp_clk = 2; /* By the book. */ 583 cke_min_clk = 1; /* By the book. */ 584 four_act = 1; /* By the book. */ 585 586 } else { 587 wr_lat = caslat - 1; 588 589 /* Convert SPD value from quarter nanos to picos. */ 590 trtp_clk = picos_to_clk(spd.trtp * 250); 591 if (trtp_clk < 2) 592 trtp_clk = 2; 593 trtp_clk += add_lat; 594 595 cke_min_clk = 3; /* By the book. */ 596 four_act = picos_to_clk(37500); /* By the book. 1k pages? */ 597 } 598 599 /* 600 * Empirically set ~MCAS-to-preamble override for DDR 2. 601 * Your mileage will vary. 602 */ 603 cpo = 0; 604 if (spd.mem_type == SPD_MEMTYPE_DDR2) { 605 #ifdef CONFIG_SYS_DDR_CPO 606 cpo = CONFIG_SYS_DDR_CPO; 607 #else 608 if (effective_data_rate == 266) { 609 cpo = 0x4; /* READ_LAT + 1/2 */ 610 } else if (effective_data_rate == 333) { 611 cpo = 0x6; /* READ_LAT + 1 */ 612 } else if (effective_data_rate == 400) { 613 cpo = 0x7; /* READ_LAT + 5/4 */ 614 } else { 615 /* Automatic calibration */ 616 cpo = 0x1f; 617 } 618 #endif 619 } 620 621 ddr->timing_cfg_2 = (0 622 | ((add_lat & 0x7) << 28) /* ADD_LAT */ 623 | ((cpo & 0x1f) << 23) /* CPO */ 624 | ((wr_lat & 0x7) << 19) /* WR_LAT */ 625 | ((trtp_clk & 0x7) << 13) /* RD_TO_PRE */ 626 | ((wr_data_delay & 0x7) << 10) /* WR_DATA_DELAY */ 627 | ((cke_min_clk & 0x7) << 6) /* CKE_PLS */ 628 | ((four_act & 0x1f) << 0) /* FOUR_ACT */ 629 ); 630 631 debug("DDR:timing_cfg_1=0x%08x\n", ddr->timing_cfg_1); 632 debug("DDR:timing_cfg_2=0x%08x\n", ddr->timing_cfg_2); 633 634 /* Check DIMM data bus width */ 635 if (spd.dataw_lsb < 64) { 636 if (spd.mem_type == SPD_MEMTYPE_DDR) 637 burstlen = 0x03; /* 32 bit data bus, burst len is 8 */ 638 else 639 burstlen = 0x02; /* 32 bit data bus, burst len is 4 */ 640 debug("\n DDR DIMM: data bus width is 32 bit"); 641 } else { 642 burstlen = 0x02; /* Others act as 64 bit bus, burst len is 4 */ 643 debug("\n DDR DIMM: data bus width is 64 bit"); 644 } 645 646 /* Is this an ECC DDR chip? */ 647 if (spd.config == 0x02) 648 debug(" with ECC\n"); 649 else 650 debug(" without ECC\n"); 651 652 /* Burst length is always 4 for 64 bit data bus, 8 for 32 bit data bus, 653 Burst type is sequential 654 */ 655 if (spd.mem_type == SPD_MEMTYPE_DDR) { 656 switch (caslat) { 657 case 1: 658 ddr->sdram_mode = 0x50 | burstlen; /* CL=1.5 */ 659 break; 660 case 2: 661 ddr->sdram_mode = 0x20 | burstlen; /* CL=2.0 */ 662 break; 663 case 3: 664 ddr->sdram_mode = 0x60 | burstlen; /* CL=2.5 */ 665 break; 666 case 4: 667 ddr->sdram_mode = 0x30 | burstlen; /* CL=3.0 */ 668 break; 669 default: 670 printf("DDR:only CL 1.5, 2.0, 2.5, 3.0 is supported\n"); 671 return 0; 672 } 673 } else { 674 mode_odt_enable = 0x0; /* Default disabled */ 675 if (odt_wr_cfg || odt_rd_cfg) { 676 /* 677 * Bits 6 and 2 in Extended MRS(1) 678 * Bit 2 == 0x04 == 75 Ohm, with 2 DIMM modules. 679 * Bit 6 == 0x40 == 150 Ohm, with 1 DIMM module. 680 */ 681 mode_odt_enable = 0x40; /* 150 Ohm */ 682 } 683 684 ddr->sdram_mode = 685 (0 686 | (1 << (16 + 10)) /* DQS Differential disable */ 687 #ifdef CONFIG_SYS_DDR_MODE_WEAK 688 | (1 << (16 + 1)) /* weak driver (~60%) */ 689 #endif 690 | (add_lat << (16 + 3)) /* Additive Latency in EMRS1 */ 691 | (mode_odt_enable << 16) /* ODT Enable in EMRS1 */ 692 | ((twr_clk - 1) << 9) /* Write Recovery Autopre */ 693 | (caslat << 4) /* caslat */ 694 | (burstlen << 0) /* Burst length */ 695 ); 696 } 697 debug("DDR:sdram_mode=0x%08x\n", ddr->sdram_mode); 698 699 /* 700 * Clear EMRS2 and EMRS3. 701 */ 702 ddr->sdram_mode2 = 0; 703 debug("DDR: sdram_mode2 = 0x%08x\n", ddr->sdram_mode2); 704 705 switch (spd.refresh) { 706 case 0x00: 707 case 0x80: 708 refresh_clk = picos_to_clk(15625000); 709 break; 710 case 0x01: 711 case 0x81: 712 refresh_clk = picos_to_clk(3900000); 713 break; 714 case 0x02: 715 case 0x82: 716 refresh_clk = picos_to_clk(7800000); 717 break; 718 case 0x03: 719 case 0x83: 720 refresh_clk = picos_to_clk(31300000); 721 break; 722 case 0x04: 723 case 0x84: 724 refresh_clk = picos_to_clk(62500000); 725 break; 726 case 0x05: 727 case 0x85: 728 refresh_clk = picos_to_clk(125000000); 729 break; 730 default: 731 refresh_clk = 0x512; 732 break; 733 } 734 735 /* 736 * Set BSTOPRE to 0x100 for page mode 737 * If auto-charge is used, set BSTOPRE = 0 738 */ 739 ddr->sdram_interval = ((refresh_clk & 0x3fff) << 16) | 0x100; 740 debug("DDR:sdram_interval=0x%08x\n", ddr->sdram_interval); 741 742 /* 743 * SDRAM Cfg 2 744 */ 745 odt_cfg = 0; 746 #ifndef CONFIG_NEVER_ASSERT_ODT_TO_CPU 747 if (odt_rd_cfg | odt_wr_cfg) { 748 odt_cfg = 0x2; /* ODT to IOs during reads */ 749 } 750 #endif 751 if (spd.mem_type == SPD_MEMTYPE_DDR2) { 752 ddr->sdram_cfg2 = (0 753 | (0 << 26) /* True DQS */ 754 | (odt_cfg << 21) /* ODT only read */ 755 | (1 << 12) /* 1 refresh at a time */ 756 ); 757 758 debug("DDR: sdram_cfg2 = 0x%08x\n", ddr->sdram_cfg2); 759 } 760 761 #ifdef CONFIG_SYS_DDR_SDRAM_CLK_CNTL /* Optional platform specific value */ 762 ddr->sdram_clk_cntl = CONFIG_SYS_DDR_SDRAM_CLK_CNTL; 763 #endif 764 debug("DDR:sdram_clk_cntl=0x%08x\n", ddr->sdram_clk_cntl); 765 766 asm("sync;isync"); 767 768 udelay(600); 769 770 /* 771 * Figure out the settings for the sdram_cfg register. Build up 772 * the value in 'sdram_cfg' before writing since the write into 773 * the register will actually enable the memory controller, and all 774 * settings must be done before enabling. 775 * 776 * sdram_cfg[0] = 1 (ddr sdram logic enable) 777 * sdram_cfg[1] = 1 (self-refresh-enable) 778 * sdram_cfg[5:7] = (SDRAM type = DDR SDRAM) 779 * 010 DDR 1 SDRAM 780 * 011 DDR 2 SDRAM 781 * sdram_cfg[12] = 0 (32_BE =0 , 64 bit bus mode) 782 * sdram_cfg[13] = 0 (8_BE =0, 4-beat bursts) 783 */ 784 if (spd.mem_type == SPD_MEMTYPE_DDR) 785 sdram_type = SDRAM_CFG_SDRAM_TYPE_DDR1; 786 else 787 sdram_type = SDRAM_CFG_SDRAM_TYPE_DDR2; 788 789 sdram_cfg = (0 790 | SDRAM_CFG_MEM_EN /* DDR enable */ 791 | SDRAM_CFG_SREN /* Self refresh */ 792 | sdram_type /* SDRAM type */ 793 ); 794 795 /* sdram_cfg[3] = RD_EN - registered DIMM enable */ 796 if (spd.mod_attr & 0x02) 797 sdram_cfg |= SDRAM_CFG_RD_EN; 798 799 /* The DIMM is 32bit width */ 800 if (spd.dataw_lsb < 64) { 801 if (spd.mem_type == SPD_MEMTYPE_DDR) 802 sdram_cfg |= SDRAM_CFG_32_BE | SDRAM_CFG_8_BE; 803 if (spd.mem_type == SPD_MEMTYPE_DDR2) 804 sdram_cfg |= SDRAM_CFG_32_BE; 805 } 806 807 ddrc_ecc_enable = 0; 808 809 #if defined(CONFIG_DDR_ECC) 810 /* Enable ECC with sdram_cfg[2] */ 811 if (spd.config == 0x02) { 812 sdram_cfg |= 0x20000000; 813 ddrc_ecc_enable = 1; 814 /* disable error detection */ 815 ddr->err_disable = ~ECC_ERROR_ENABLE; 816 /* set single bit error threshold to maximum value, 817 * reset counter to zero */ 818 ddr->err_sbe = (255 << ECC_ERROR_MAN_SBET_SHIFT) | 819 (0 << ECC_ERROR_MAN_SBEC_SHIFT); 820 } 821 822 debug("DDR:err_disable=0x%08x\n", ddr->err_disable); 823 debug("DDR:err_sbe=0x%08x\n", ddr->err_sbe); 824 #endif 825 debug(" DDRC ECC mode: %s\n", ddrc_ecc_enable ? "ON":"OFF"); 826 827 #if defined(CONFIG_DDR_2T_TIMING) 828 /* 829 * Enable 2T timing by setting sdram_cfg[16]. 830 */ 831 sdram_cfg |= SDRAM_CFG_2T_EN; 832 #endif 833 /* Enable controller, and GO! */ 834 ddr->sdram_cfg = sdram_cfg; 835 asm("sync;isync"); 836 udelay(500); 837 838 debug("DDR:sdram_cfg=0x%08x\n", ddr->sdram_cfg); 839 return memsize; /*in MBytes*/ 840 } 841 #endif /* CONFIG_SPD_EEPROM */ 842 843 #if defined(CONFIG_DDR_ECC) && !defined(CONFIG_ECC_INIT_VIA_DDRCONTROLLER) 844 /* 845 * Use timebase counter, get_timer() is not available 846 * at this point of initialization yet. 847 */ 848 static __inline__ unsigned long get_tbms (void) 849 { 850 unsigned long tbl; 851 unsigned long tbu1, tbu2; 852 unsigned long ms; 853 unsigned long long tmp; 854 855 ulong tbclk = get_tbclk(); 856 857 /* get the timebase ticks */ 858 do { 859 asm volatile ("mftbu %0":"=r" (tbu1):); 860 asm volatile ("mftb %0":"=r" (tbl):); 861 asm volatile ("mftbu %0":"=r" (tbu2):); 862 } while (tbu1 != tbu2); 863 864 /* convert ticks to ms */ 865 tmp = (unsigned long long)(tbu1); 866 tmp = (tmp << 32); 867 tmp += (unsigned long long)(tbl); 868 ms = tmp/(tbclk/1000); 869 870 return ms; 871 } 872 873 /* 874 * Initialize all of memory for ECC, then enable errors. 875 */ 876 void ddr_enable_ecc(unsigned int dram_size) 877 { 878 volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR; 879 volatile ddr83xx_t *ddr= &immap->ddr; 880 unsigned long t_start, t_end; 881 register u64 *p; 882 register uint size; 883 unsigned int pattern[2]; 884 885 icache_enable(); 886 t_start = get_tbms(); 887 pattern[0] = 0xdeadbeef; 888 pattern[1] = 0xdeadbeef; 889 890 #if defined(CONFIG_DDR_ECC_INIT_VIA_DMA) 891 dma_meminit(pattern[0], dram_size); 892 #else 893 debug("ddr init: CPU FP write method\n"); 894 size = dram_size; 895 for (p = 0; p < (u64*)(size); p++) { 896 ppcDWstore((u32*)p, pattern); 897 } 898 __asm__ __volatile__ ("sync"); 899 #endif 900 901 t_end = get_tbms(); 902 icache_disable(); 903 904 debug("\nREADY!!\n"); 905 debug("ddr init duration: %ld ms\n", t_end - t_start); 906 907 /* Clear All ECC Errors */ 908 if ((ddr->err_detect & ECC_ERROR_DETECT_MME) == ECC_ERROR_DETECT_MME) 909 ddr->err_detect |= ECC_ERROR_DETECT_MME; 910 if ((ddr->err_detect & ECC_ERROR_DETECT_MBE) == ECC_ERROR_DETECT_MBE) 911 ddr->err_detect |= ECC_ERROR_DETECT_MBE; 912 if ((ddr->err_detect & ECC_ERROR_DETECT_SBE) == ECC_ERROR_DETECT_SBE) 913 ddr->err_detect |= ECC_ERROR_DETECT_SBE; 914 if ((ddr->err_detect & ECC_ERROR_DETECT_MSE) == ECC_ERROR_DETECT_MSE) 915 ddr->err_detect |= ECC_ERROR_DETECT_MSE; 916 917 /* Disable ECC-Interrupts */ 918 ddr->err_int_en &= ECC_ERR_INT_DISABLE; 919 920 /* Enable errors for ECC */ 921 ddr->err_disable &= ECC_ERROR_ENABLE; 922 923 __asm__ __volatile__ ("sync"); 924 __asm__ __volatile__ ("isync"); 925 } 926 #endif /* CONFIG_DDR_ECC */ 927
