1 /* 2 * Intel 3200/3210 Memory Controller kernel module 3 * Copyright (C) 2008-2009 Akamai Technologies, Inc. 4 * Portions by Hitoshi Mitake <h.mitake@gmail.com>. 5 * 6 * This file may be distributed under the terms of the 7 * GNU General Public License. 8 */ 9 10 #include <linux/module.h> 11 #include <linux/init.h> 12 #include <linux/pci.h> 13 #include <linux/pci_ids.h> 14 #include <linux/edac.h> 15 #include <linux/io.h> 16 #include "edac_core.h" 17 18 #include <linux/io-64-nonatomic-lo-hi.h> 19 20 #define I3200_REVISION "1.1" 21 22 #define EDAC_MOD_STR "i3200_edac" 23 24 #define PCI_DEVICE_ID_INTEL_3200_HB 0x29f0 25 26 #define I3200_DIMMS 4 27 #define I3200_RANKS 8 28 #define I3200_RANKS_PER_CHANNEL 4 29 #define I3200_CHANNELS 2 30 31 /* Intel 3200 register addresses - device 0 function 0 - DRAM Controller */ 32 33 #define I3200_MCHBAR_LOW 0x48 /* MCH Memory Mapped Register BAR */ 34 #define I3200_MCHBAR_HIGH 0x4c 35 #define I3200_MCHBAR_MASK 0xfffffc000ULL /* bits 35:14 */ 36 #define I3200_MMR_WINDOW_SIZE 16384 37 38 #define I3200_TOM 0xa0 /* Top of Memory (16b) 39 * 40 * 15:10 reserved 41 * 9:0 total populated physical memory 42 */ 43 #define I3200_TOM_MASK 0x3ff /* bits 9:0 */ 44 #define I3200_TOM_SHIFT 26 /* 64MiB grain */ 45 46 #define I3200_ERRSTS 0xc8 /* Error Status Register (16b) 47 * 48 * 15 reserved 49 * 14 Isochronous TBWRR Run Behind FIFO Full 50 * (ITCV) 51 * 13 Isochronous TBWRR Run Behind FIFO Put 52 * (ITSTV) 53 * 12 reserved 54 * 11 MCH Thermal Sensor Event 55 * for SMI/SCI/SERR (GTSE) 56 * 10 reserved 57 * 9 LOCK to non-DRAM Memory Flag (LCKF) 58 * 8 reserved 59 * 7 DRAM Throttle Flag (DTF) 60 * 6:2 reserved 61 * 1 Multi-bit DRAM ECC Error Flag (DMERR) 62 * 0 Single-bit DRAM ECC Error Flag (DSERR) 63 */ 64 #define I3200_ERRSTS_UE 0x0002 65 #define I3200_ERRSTS_CE 0x0001 66 #define I3200_ERRSTS_BITS (I3200_ERRSTS_UE | I3200_ERRSTS_CE) 67 68 69 /* Intel MMIO register space - device 0 function 0 - MMR space */ 70 71 #define I3200_C0DRB 0x200 /* Channel 0 DRAM Rank Boundary (16b x 4) 72 * 73 * 15:10 reserved 74 * 9:0 Channel 0 DRAM Rank Boundary Address 75 */ 76 #define I3200_C1DRB 0x600 /* Channel 1 DRAM Rank Boundary (16b x 4) */ 77 #define I3200_DRB_MASK 0x3ff /* bits 9:0 */ 78 #define I3200_DRB_SHIFT 26 /* 64MiB grain */ 79 80 #define I3200_C0ECCERRLOG 0x280 /* Channel 0 ECC Error Log (64b) 81 * 82 * 63:48 Error Column Address (ERRCOL) 83 * 47:32 Error Row Address (ERRROW) 84 * 31:29 Error Bank Address (ERRBANK) 85 * 28:27 Error Rank Address (ERRRANK) 86 * 26:24 reserved 87 * 23:16 Error Syndrome (ERRSYND) 88 * 15: 2 reserved 89 * 1 Multiple Bit Error Status (MERRSTS) 90 * 0 Correctable Error Status (CERRSTS) 91 */ 92 #define I3200_C1ECCERRLOG 0x680 /* Chan 1 ECC Error Log (64b) */ 93 #define I3200_ECCERRLOG_CE 0x1 94 #define I3200_ECCERRLOG_UE 0x2 95 #define I3200_ECCERRLOG_RANK_BITS 0x18000000 96 #define I3200_ECCERRLOG_RANK_SHIFT 27 97 #define I3200_ECCERRLOG_SYNDROME_BITS 0xff0000 98 #define I3200_ECCERRLOG_SYNDROME_SHIFT 16 99 #define I3200_CAPID0 0xe0 /* P.95 of spec for details */ 100 101 struct i3200_priv { 102 void __iomem *window; 103 }; 104 105 static int nr_channels; 106 107 static int how_many_channels(struct pci_dev *pdev) 108 { 109 int n_channels; 110 111 unsigned char capid0_8b; /* 8th byte of CAPID0 */ 112 113 pci_read_config_byte(pdev, I3200_CAPID0 + 8, &capid0_8b); 114 115 if (capid0_8b & 0x20) { /* check DCD: Dual Channel Disable */ 116 edac_dbg(0, "In single channel mode\n"); 117 n_channels = 1; 118 } else { 119 edac_dbg(0, "In dual channel mode\n"); 120 n_channels = 2; 121 } 122 123 if (capid0_8b & 0x10) /* check if both channels are filled */ 124 edac_dbg(0, "2 DIMMS per channel disabled\n"); 125 else 126 edac_dbg(0, "2 DIMMS per channel enabled\n"); 127 128 return n_channels; 129 } 130 131 static unsigned long eccerrlog_syndrome(u64 log) 132 { 133 return (log & I3200_ECCERRLOG_SYNDROME_BITS) >> 134 I3200_ECCERRLOG_SYNDROME_SHIFT; 135 } 136 137 static int eccerrlog_row(int channel, u64 log) 138 { 139 u64 rank = ((log & I3200_ECCERRLOG_RANK_BITS) >> 140 I3200_ECCERRLOG_RANK_SHIFT); 141 return rank | (channel * I3200_RANKS_PER_CHANNEL); 142 } 143 144 enum i3200_chips { 145 I3200 = 0, 146 }; 147 148 struct i3200_dev_info { 149 const char *ctl_name; 150 }; 151 152 struct i3200_error_info { 153 u16 errsts; 154 u16 errsts2; 155 u64 eccerrlog[I3200_CHANNELS]; 156 }; 157 158 static const struct i3200_dev_info i3200_devs[] = { 159 [I3200] = { 160 .ctl_name = "i3200" 161 }, 162 }; 163 164 static struct pci_dev *mci_pdev; 165 static int i3200_registered = 1; 166 167 168 static void i3200_clear_error_info(struct mem_ctl_info *mci) 169 { 170 struct pci_dev *pdev; 171 172 pdev = to_pci_dev(mci->pdev); 173 174 /* 175 * Clear any error bits. 176 * (Yes, we really clear bits by writing 1 to them.) 177 */ 178 pci_write_bits16(pdev, I3200_ERRSTS, I3200_ERRSTS_BITS, 179 I3200_ERRSTS_BITS); 180 } 181 182 static void i3200_get_and_clear_error_info(struct mem_ctl_info *mci, 183 struct i3200_error_info *info) 184 { 185 struct pci_dev *pdev; 186 struct i3200_priv *priv = mci->pvt_info; 187 void __iomem *window = priv->window; 188 189 pdev = to_pci_dev(mci->pdev); 190 191 /* 192 * This is a mess because there is no atomic way to read all the 193 * registers at once and the registers can transition from CE being 194 * overwritten by UE. 195 */ 196 pci_read_config_word(pdev, I3200_ERRSTS, &info->errsts); 197 if (!(info->errsts & I3200_ERRSTS_BITS)) 198 return; 199 200 info->eccerrlog[0] = readq(window + I3200_C0ECCERRLOG); 201 if (nr_channels == 2) 202 info->eccerrlog[1] = readq(window + I3200_C1ECCERRLOG); 203 204 pci_read_config_word(pdev, I3200_ERRSTS, &info->errsts2); 205 206 /* 207 * If the error is the same for both reads then the first set 208 * of reads is valid. If there is a change then there is a CE 209 * with no info and the second set of reads is valid and 210 * should be UE info. 211 */ 212 if ((info->errsts ^ info->errsts2) & I3200_ERRSTS_BITS) { 213 info->eccerrlog[0] = readq(window + I3200_C0ECCERRLOG); 214 if (nr_channels == 2) 215 info->eccerrlog[1] = readq(window + I3200_C1ECCERRLOG); 216 } 217 218 i3200_clear_error_info(mci); 219 } 220 221 static void i3200_process_error_info(struct mem_ctl_info *mci, 222 struct i3200_error_info *info) 223 { 224 int channel; 225 u64 log; 226 227 if (!(info->errsts & I3200_ERRSTS_BITS)) 228 return; 229 230 if ((info->errsts ^ info->errsts2) & I3200_ERRSTS_BITS) { 231 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 0, 0, 0, 232 -1, -1, -1, "UE overwrote CE", ""); 233 info->errsts = info->errsts2; 234 } 235 236 for (channel = 0; channel < nr_channels; channel++) { 237 log = info->eccerrlog[channel]; 238 if (log & I3200_ECCERRLOG_UE) { 239 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 240 0, 0, 0, 241 eccerrlog_row(channel, log), 242 -1, -1, 243 "i3000 UE", ""); 244 } else if (log & I3200_ECCERRLOG_CE) { 245 edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1, 246 0, 0, eccerrlog_syndrome(log), 247 eccerrlog_row(channel, log), 248 -1, -1, 249 "i3000 CE", ""); 250 } 251 } 252 } 253 254 static void i3200_check(struct mem_ctl_info *mci) 255 { 256 struct i3200_error_info info; 257 258 edac_dbg(1, "MC%d\n", mci->mc_idx); 259 i3200_get_and_clear_error_info(mci, &info); 260 i3200_process_error_info(mci, &info); 261 } 262 263 static void __iomem *i3200_map_mchbar(struct pci_dev *pdev) 264 { 265 union { 266 u64 mchbar; 267 struct { 268 u32 mchbar_low; 269 u32 mchbar_high; 270 }; 271 } u; 272 void __iomem *window; 273 274 pci_read_config_dword(pdev, I3200_MCHBAR_LOW, &u.mchbar_low); 275 pci_read_config_dword(pdev, I3200_MCHBAR_HIGH, &u.mchbar_high); 276 u.mchbar &= I3200_MCHBAR_MASK; 277 278 if (u.mchbar != (resource_size_t)u.mchbar) { 279 printk(KERN_ERR 280 "i3200: mmio space beyond accessible range (0x%llx)\n", 281 (unsigned long long)u.mchbar); 282 return NULL; 283 } 284 285 window = ioremap_nocache(u.mchbar, I3200_MMR_WINDOW_SIZE); 286 if (!window) 287 printk(KERN_ERR "i3200: cannot map mmio space at 0x%llx\n", 288 (unsigned long long)u.mchbar); 289 290 return window; 291 } 292 293 294 static void i3200_get_drbs(void __iomem *window, 295 u16 drbs[I3200_CHANNELS][I3200_RANKS_PER_CHANNEL]) 296 { 297 int i; 298 299 for (i = 0; i < I3200_RANKS_PER_CHANNEL; i++) { 300 drbs[0][i] = readw(window + I3200_C0DRB + 2*i) & I3200_DRB_MASK; 301 drbs[1][i] = readw(window + I3200_C1DRB + 2*i) & I3200_DRB_MASK; 302 303 edac_dbg(0, "drb[0][%d] = %d, drb[1][%d] = %d\n", i, drbs[0][i], i, drbs[1][i]); 304 } 305 } 306 307 static bool i3200_is_stacked(struct pci_dev *pdev, 308 u16 drbs[I3200_CHANNELS][I3200_RANKS_PER_CHANNEL]) 309 { 310 u16 tom; 311 312 pci_read_config_word(pdev, I3200_TOM, &tom); 313 tom &= I3200_TOM_MASK; 314 315 return drbs[I3200_CHANNELS - 1][I3200_RANKS_PER_CHANNEL - 1] == tom; 316 } 317 318 static unsigned long drb_to_nr_pages( 319 u16 drbs[I3200_CHANNELS][I3200_RANKS_PER_CHANNEL], bool stacked, 320 int channel, int rank) 321 { 322 int n; 323 324 n = drbs[channel][rank]; 325 if (!n) 326 return 0; 327 328 if (rank > 0) 329 n -= drbs[channel][rank - 1]; 330 if (stacked && (channel == 1) && 331 drbs[channel][rank] == drbs[channel][I3200_RANKS_PER_CHANNEL - 1]) 332 n -= drbs[0][I3200_RANKS_PER_CHANNEL - 1]; 333 334 n <<= (I3200_DRB_SHIFT - PAGE_SHIFT); 335 return n; 336 } 337 338 static int i3200_probe1(struct pci_dev *pdev, int dev_idx) 339 { 340 int rc; 341 int i, j; 342 struct mem_ctl_info *mci = NULL; 343 struct edac_mc_layer layers[2]; 344 u16 drbs[I3200_CHANNELS][I3200_RANKS_PER_CHANNEL]; 345 bool stacked; 346 void __iomem *window; 347 struct i3200_priv *priv; 348 349 edac_dbg(0, "MC:\n"); 350 351 window = i3200_map_mchbar(pdev); 352 if (!window) 353 return -ENODEV; 354 355 i3200_get_drbs(window, drbs); 356 nr_channels = how_many_channels(pdev); 357 358 layers[0].type = EDAC_MC_LAYER_CHIP_SELECT; 359 layers[0].size = I3200_DIMMS; 360 layers[0].is_virt_csrow = true; 361 layers[1].type = EDAC_MC_LAYER_CHANNEL; 362 layers[1].size = nr_channels; 363 layers[1].is_virt_csrow = false; 364 mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, 365 sizeof(struct i3200_priv)); 366 if (!mci) 367 return -ENOMEM; 368 369 edac_dbg(3, "MC: init mci\n"); 370 371 mci->pdev = &pdev->dev; 372 mci->mtype_cap = MEM_FLAG_DDR2; 373 374 mci->edac_ctl_cap = EDAC_FLAG_SECDED; 375 mci->edac_cap = EDAC_FLAG_SECDED; 376 377 mci->mod_name = EDAC_MOD_STR; 378 mci->mod_ver = I3200_REVISION; 379 mci->ctl_name = i3200_devs[dev_idx].ctl_name; 380 mci->dev_name = pci_name(pdev); 381 mci->edac_check = i3200_check; 382 mci->ctl_page_to_phys = NULL; 383 priv = mci->pvt_info; 384 priv->window = window; 385 386 stacked = i3200_is_stacked(pdev, drbs); 387 388 /* 389 * The dram rank boundary (DRB) reg values are boundary addresses 390 * for each DRAM rank with a granularity of 64MB. DRB regs are 391 * cumulative; the last one will contain the total memory 392 * contained in all ranks. 393 */ 394 for (i = 0; i < I3200_DIMMS; i++) { 395 unsigned long nr_pages; 396 397 for (j = 0; j < nr_channels; j++) { 398 struct dimm_info *dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms, 399 mci->n_layers, i, j, 0); 400 401 nr_pages = drb_to_nr_pages(drbs, stacked, j, i); 402 if (nr_pages == 0) 403 continue; 404 405 edac_dbg(0, "csrow %d, channel %d%s, size = %ld Mb\n", i, j, 406 stacked ? " (stacked)" : "", PAGES_TO_MiB(nr_pages)); 407 408 dimm->nr_pages = nr_pages; 409 dimm->grain = nr_pages << PAGE_SHIFT; 410 dimm->mtype = MEM_DDR2; 411 dimm->dtype = DEV_UNKNOWN; 412 dimm->edac_mode = EDAC_UNKNOWN; 413 } 414 } 415 416 i3200_clear_error_info(mci); 417 418 rc = -ENODEV; 419 if (edac_mc_add_mc(mci)) { 420 edac_dbg(3, "MC: failed edac_mc_add_mc()\n"); 421 goto fail; 422 } 423 424 /* get this far and it's successful */ 425 edac_dbg(3, "MC: success\n"); 426 return 0; 427 428 fail: 429 iounmap(window); 430 if (mci) 431 edac_mc_free(mci); 432 433 return rc; 434 } 435 436 static int i3200_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) 437 { 438 int rc; 439 440 edac_dbg(0, "MC:\n"); 441 442 if (pci_enable_device(pdev) < 0) 443 return -EIO; 444 445 rc = i3200_probe1(pdev, ent->driver_data); 446 if (!mci_pdev) 447 mci_pdev = pci_dev_get(pdev); 448 449 return rc; 450 } 451 452 static void i3200_remove_one(struct pci_dev *pdev) 453 { 454 struct mem_ctl_info *mci; 455 struct i3200_priv *priv; 456 457 edac_dbg(0, "\n"); 458 459 mci = edac_mc_del_mc(&pdev->dev); 460 if (!mci) 461 return; 462 463 priv = mci->pvt_info; 464 iounmap(priv->window); 465 466 edac_mc_free(mci); 467 468 pci_disable_device(pdev); 469 } 470 471 static const struct pci_device_id i3200_pci_tbl[] = { 472 { 473 PCI_VEND_DEV(INTEL, 3200_HB), PCI_ANY_ID, PCI_ANY_ID, 0, 0, 474 I3200}, 475 { 476 0, 477 } /* 0 terminated list. */ 478 }; 479 480 MODULE_DEVICE_TABLE(pci, i3200_pci_tbl); 481 482 static struct pci_driver i3200_driver = { 483 .name = EDAC_MOD_STR, 484 .probe = i3200_init_one, 485 .remove = i3200_remove_one, 486 .id_table = i3200_pci_tbl, 487 }; 488 489 static int __init i3200_init(void) 490 { 491 int pci_rc; 492 493 edac_dbg(3, "MC:\n"); 494 495 /* Ensure that the OPSTATE is set correctly for POLL or NMI */ 496 opstate_init(); 497 498 pci_rc = pci_register_driver(&i3200_driver); 499 if (pci_rc < 0) 500 goto fail0; 501 502 if (!mci_pdev) { 503 i3200_registered = 0; 504 mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL, 505 PCI_DEVICE_ID_INTEL_3200_HB, NULL); 506 if (!mci_pdev) { 507 edac_dbg(0, "i3200 pci_get_device fail\n"); 508 pci_rc = -ENODEV; 509 goto fail1; 510 } 511 512 pci_rc = i3200_init_one(mci_pdev, i3200_pci_tbl); 513 if (pci_rc < 0) { 514 edac_dbg(0, "i3200 init fail\n"); 515 pci_rc = -ENODEV; 516 goto fail1; 517 } 518 } 519 520 return 0; 521 522 fail1: 523 pci_unregister_driver(&i3200_driver); 524 525 fail0: 526 pci_dev_put(mci_pdev); 527 528 return pci_rc; 529 } 530 531 static void __exit i3200_exit(void) 532 { 533 edac_dbg(3, "MC:\n"); 534 535 pci_unregister_driver(&i3200_driver); 536 if (!i3200_registered) { 537 i3200_remove_one(mci_pdev); 538 pci_dev_put(mci_pdev); 539 } 540 } 541 542 module_init(i3200_init); 543 module_exit(i3200_exit); 544 545 MODULE_LICENSE("GPL"); 546 MODULE_AUTHOR("Akamai Technologies, Inc."); 547 MODULE_DESCRIPTION("MC support for Intel 3200 memory hub controllers"); 548 549 module_param(edac_op_state, int, 0444); 550 MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI"); 551