1 /* 2 * Intel D82875P Memory Controller kernel module 3 * (C) 2003 Linux Networx (http://lnxi.com) 4 * This file may be distributed under the terms of the 5 * GNU General Public License. 6 * 7 * Written by Thayne Harbaugh 8 * Contributors: 9 * Wang Zhenyu at intel.com 10 * 11 * $Id: edac_i82875p.c,v 1.5.2.11 2005/10/05 00:43:44 dsp_llnl Exp $ 12 * 13 * Note: E7210 appears same as D82875P - zhenyu.z.wang at intel.com 14 */ 15 16 #include <linux/module.h> 17 #include <linux/init.h> 18 #include <linux/pci.h> 19 #include <linux/pci_ids.h> 20 #include <linux/slab.h> 21 #include <linux/edac.h> 22 #include "edac_core.h" 23 24 #define I82875P_REVISION " Ver: 2.0.2 " __DATE__ 25 #define EDAC_MOD_STR "i82875p_edac" 26 27 #define i82875p_printk(level, fmt, arg...) \ 28 edac_printk(level, "i82875p", fmt, ##arg) 29 30 #define i82875p_mc_printk(mci, level, fmt, arg...) \ 31 edac_mc_chipset_printk(mci, level, "i82875p", fmt, ##arg) 32 33 #ifndef PCI_DEVICE_ID_INTEL_82875_0 34 #define PCI_DEVICE_ID_INTEL_82875_0 0x2578 35 #endif /* PCI_DEVICE_ID_INTEL_82875_0 */ 36 37 #ifndef PCI_DEVICE_ID_INTEL_82875_6 38 #define PCI_DEVICE_ID_INTEL_82875_6 0x257e 39 #endif /* PCI_DEVICE_ID_INTEL_82875_6 */ 40 41 /* four csrows in dual channel, eight in single channel */ 42 #define I82875P_NR_CSROWS(nr_chans) (8/(nr_chans)) 43 44 /* Intel 82875p register addresses - device 0 function 0 - DRAM Controller */ 45 #define I82875P_EAP 0x58 /* Error Address Pointer (32b) 46 * 47 * 31:12 block address 48 * 11:0 reserved 49 */ 50 51 #define I82875P_DERRSYN 0x5c /* DRAM Error Syndrome (8b) 52 * 53 * 7:0 DRAM ECC Syndrome 54 */ 55 56 #define I82875P_DES 0x5d /* DRAM Error Status (8b) 57 * 58 * 7:1 reserved 59 * 0 Error channel 0/1 60 */ 61 62 #define I82875P_ERRSTS 0xc8 /* Error Status Register (16b) 63 * 64 * 15:10 reserved 65 * 9 non-DRAM lock error (ndlock) 66 * 8 Sftwr Generated SMI 67 * 7 ECC UE 68 * 6 reserved 69 * 5 MCH detects unimplemented cycle 70 * 4 AGP access outside GA 71 * 3 Invalid AGP access 72 * 2 Invalid GA translation table 73 * 1 Unsupported AGP command 74 * 0 ECC CE 75 */ 76 77 #define I82875P_ERRCMD 0xca /* Error Command (16b) 78 * 79 * 15:10 reserved 80 * 9 SERR on non-DRAM lock 81 * 8 SERR on ECC UE 82 * 7 SERR on ECC CE 83 * 6 target abort on high exception 84 * 5 detect unimplemented cyc 85 * 4 AGP access outside of GA 86 * 3 SERR on invalid AGP access 87 * 2 invalid translation table 88 * 1 SERR on unsupported AGP command 89 * 0 reserved 90 */ 91 92 /* Intel 82875p register addresses - device 6 function 0 - DRAM Controller */ 93 #define I82875P_PCICMD6 0x04 /* PCI Command Register (16b) 94 * 95 * 15:10 reserved 96 * 9 fast back-to-back - ro 0 97 * 8 SERR enable - ro 0 98 * 7 addr/data stepping - ro 0 99 * 6 parity err enable - ro 0 100 * 5 VGA palette snoop - ro 0 101 * 4 mem wr & invalidate - ro 0 102 * 3 special cycle - ro 0 103 * 2 bus master - ro 0 104 * 1 mem access dev6 - 0(dis),1(en) 105 * 0 IO access dev3 - 0(dis),1(en) 106 */ 107 108 #define I82875P_BAR6 0x10 /* Mem Delays Base ADDR Reg (32b) 109 * 110 * 31:12 mem base addr [31:12] 111 * 11:4 address mask - ro 0 112 * 3 prefetchable - ro 0(non),1(pre) 113 * 2:1 mem type - ro 0 114 * 0 mem space - ro 0 115 */ 116 117 /* Intel 82875p MMIO register space - device 0 function 0 - MMR space */ 118 119 #define I82875P_DRB_SHIFT 26 /* 64MiB grain */ 120 #define I82875P_DRB 0x00 /* DRAM Row Boundary (8b x 8) 121 * 122 * 7 reserved 123 * 6:0 64MiB row boundary addr 124 */ 125 126 #define I82875P_DRA 0x10 /* DRAM Row Attribute (4b x 8) 127 * 128 * 7 reserved 129 * 6:4 row attr row 1 130 * 3 reserved 131 * 2:0 row attr row 0 132 * 133 * 000 = 4KiB 134 * 001 = 8KiB 135 * 010 = 16KiB 136 * 011 = 32KiB 137 */ 138 139 #define I82875P_DRC 0x68 /* DRAM Controller Mode (32b) 140 * 141 * 31:30 reserved 142 * 29 init complete 143 * 28:23 reserved 144 * 22:21 nr chan 00=1,01=2 145 * 20 reserved 146 * 19:18 Data Integ Mode 00=none,01=ecc 147 * 17:11 reserved 148 * 10:8 refresh mode 149 * 7 reserved 150 * 6:4 mode select 151 * 3:2 reserved 152 * 1:0 DRAM type 01=DDR 153 */ 154 155 enum i82875p_chips { 156 I82875P = 0, 157 }; 158 159 struct i82875p_pvt { 160 struct pci_dev *ovrfl_pdev; 161 void __iomem *ovrfl_window; 162 }; 163 164 struct i82875p_dev_info { 165 const char *ctl_name; 166 }; 167 168 struct i82875p_error_info { 169 u16 errsts; 170 u32 eap; 171 u8 des; 172 u8 derrsyn; 173 u16 errsts2; 174 }; 175 176 static const struct i82875p_dev_info i82875p_devs[] = { 177 [I82875P] = { 178 .ctl_name = "i82875p"}, 179 }; 180 181 static struct pci_dev *mci_pdev; /* init dev: in case that AGP code has 182 * already registered driver 183 */ 184 185 static struct edac_pci_ctl_info *i82875p_pci; 186 187 static void i82875p_get_error_info(struct mem_ctl_info *mci, 188 struct i82875p_error_info *info) 189 { 190 struct pci_dev *pdev; 191 192 pdev = to_pci_dev(mci->dev); 193 194 /* 195 * This is a mess because there is no atomic way to read all the 196 * registers at once and the registers can transition from CE being 197 * overwritten by UE. 198 */ 199 pci_read_config_word(pdev, I82875P_ERRSTS, &info->errsts); 200 201 if (!(info->errsts & 0x0081)) 202 return; 203 204 pci_read_config_dword(pdev, I82875P_EAP, &info->eap); 205 pci_read_config_byte(pdev, I82875P_DES, &info->des); 206 pci_read_config_byte(pdev, I82875P_DERRSYN, &info->derrsyn); 207 pci_read_config_word(pdev, I82875P_ERRSTS, &info->errsts2); 208 209 /* 210 * If the error is the same then we can for both reads then 211 * the first set of reads is valid. If there is a change then 212 * there is a CE no info and the second set of reads is valid 213 * and should be UE info. 214 */ 215 if ((info->errsts ^ info->errsts2) & 0x0081) { 216 pci_read_config_dword(pdev, I82875P_EAP, &info->eap); 217 pci_read_config_byte(pdev, I82875P_DES, &info->des); 218 pci_read_config_byte(pdev, I82875P_DERRSYN, &info->derrsyn); 219 } 220 221 pci_write_bits16(pdev, I82875P_ERRSTS, 0x0081, 0x0081); 222 } 223 224 static int i82875p_process_error_info(struct mem_ctl_info *mci, 225 struct i82875p_error_info *info, 226 int handle_errors) 227 { 228 int row, multi_chan; 229 230 multi_chan = mci->csrows[0].nr_channels - 1; 231 232 if (!(info->errsts & 0x0081)) 233 return 0; 234 235 if (!handle_errors) 236 return 1; 237 238 if ((info->errsts ^ info->errsts2) & 0x0081) { 239 edac_mc_handle_ce_no_info(mci, "UE overwrote CE"); 240 info->errsts = info->errsts2; 241 } 242 243 info->eap >>= PAGE_SHIFT; 244 row = edac_mc_find_csrow_by_page(mci, info->eap); 245 246 if (info->errsts & 0x0080) 247 edac_mc_handle_ue(mci, info->eap, 0, row, "i82875p UE"); 248 else 249 edac_mc_handle_ce(mci, info->eap, 0, info->derrsyn, row, 250 multi_chan ? (info->des & 0x1) : 0, 251 "i82875p CE"); 252 253 return 1; 254 } 255 256 static void i82875p_check(struct mem_ctl_info *mci) 257 { 258 struct i82875p_error_info info; 259 260 debugf1("MC%d: %s()\n", mci->mc_idx, __func__); 261 i82875p_get_error_info(mci, &info); 262 i82875p_process_error_info(mci, &info, 1); 263 } 264 265 /* Return 0 on success or 1 on failure. */ 266 static int i82875p_setup_overfl_dev(struct pci_dev *pdev, 267 struct pci_dev **ovrfl_pdev, 268 void __iomem **ovrfl_window) 269 { 270 struct pci_dev *dev; 271 void __iomem *window; 272 int err; 273 274 *ovrfl_pdev = NULL; 275 *ovrfl_window = NULL; 276 dev = pci_get_device(PCI_VEND_DEV(INTEL, 82875_6), NULL); 277 278 if (dev == NULL) { 279 /* Intel tells BIOS developers to hide device 6 which 280 * configures the overflow device access containing 281 * the DRBs - this is where we expose device 6. 282 * http://www.x86-secret.com/articles/tweak/pat/patsecrets-2.htm 283 */ 284 pci_write_bits8(pdev, 0xf4, 0x2, 0x2); 285 dev = pci_scan_single_device(pdev->bus, PCI_DEVFN(6, 0)); 286 287 if (dev == NULL) 288 return 1; 289 290 err = pci_bus_add_device(dev); 291 if (err) { 292 i82875p_printk(KERN_ERR, 293 "%s(): pci_bus_add_device() Failed\n", 294 __func__); 295 } 296 pci_bus_assign_resources(dev->bus); 297 } 298 299 *ovrfl_pdev = dev; 300 301 if (pci_enable_device(dev)) { 302 i82875p_printk(KERN_ERR, "%s(): Failed to enable overflow " 303 "device\n", __func__); 304 return 1; 305 } 306 307 if (pci_request_regions(dev, pci_name(dev))) { 308 #ifdef CORRECT_BIOS 309 goto fail0; 310 #endif 311 } 312 313 /* cache is irrelevant for PCI bus reads/writes */ 314 window = pci_ioremap_bar(dev, 0); 315 if (window == NULL) { 316 i82875p_printk(KERN_ERR, "%s(): Failed to ioremap bar6\n", 317 __func__); 318 goto fail1; 319 } 320 321 *ovrfl_window = window; 322 return 0; 323 324 fail1: 325 pci_release_regions(dev); 326 327 #ifdef CORRECT_BIOS 328 fail0: 329 pci_disable_device(dev); 330 #endif 331 /* NOTE: the ovrfl proc entry and pci_dev are intentionally left */ 332 return 1; 333 } 334 335 /* Return 1 if dual channel mode is active. Else return 0. */ 336 static inline int dual_channel_active(u32 drc) 337 { 338 return (drc >> 21) & 0x1; 339 } 340 341 static void i82875p_init_csrows(struct mem_ctl_info *mci, 342 struct pci_dev *pdev, 343 void __iomem * ovrfl_window, u32 drc) 344 { 345 struct csrow_info *csrow; 346 unsigned long last_cumul_size; 347 u8 value; 348 u32 drc_ddim; /* DRAM Data Integrity Mode 0=none,2=edac */ 349 u32 cumul_size; 350 int index; 351 352 drc_ddim = (drc >> 18) & 0x1; 353 last_cumul_size = 0; 354 355 /* The dram row boundary (DRB) reg values are boundary address 356 * for each DRAM row with a granularity of 32 or 64MB (single/dual 357 * channel operation). DRB regs are cumulative; therefore DRB7 will 358 * contain the total memory contained in all eight rows. 359 */ 360 361 for (index = 0; index < mci->nr_csrows; index++) { 362 csrow = &mci->csrows[index]; 363 364 value = readb(ovrfl_window + I82875P_DRB + index); 365 cumul_size = value << (I82875P_DRB_SHIFT - PAGE_SHIFT); 366 debugf3("%s(): (%d) cumul_size 0x%x\n", __func__, index, 367 cumul_size); 368 if (cumul_size == last_cumul_size) 369 continue; /* not populated */ 370 371 csrow->first_page = last_cumul_size; 372 csrow->last_page = cumul_size - 1; 373 csrow->nr_pages = cumul_size - last_cumul_size; 374 last_cumul_size = cumul_size; 375 csrow->grain = 1 << 12; /* I82875P_EAP has 4KiB reolution */ 376 csrow->mtype = MEM_DDR; 377 csrow->dtype = DEV_UNKNOWN; 378 csrow->edac_mode = drc_ddim ? EDAC_SECDED : EDAC_NONE; 379 } 380 } 381 382 static int i82875p_probe1(struct pci_dev *pdev, int dev_idx) 383 { 384 int rc = -ENODEV; 385 struct mem_ctl_info *mci; 386 struct i82875p_pvt *pvt; 387 struct pci_dev *ovrfl_pdev; 388 void __iomem *ovrfl_window; 389 u32 drc; 390 u32 nr_chans; 391 struct i82875p_error_info discard; 392 393 debugf0("%s()\n", __func__); 394 395 ovrfl_pdev = pci_get_device(PCI_VEND_DEV(INTEL, 82875_6), NULL); 396 397 if (i82875p_setup_overfl_dev(pdev, &ovrfl_pdev, &ovrfl_window)) 398 return -ENODEV; 399 drc = readl(ovrfl_window + I82875P_DRC); 400 nr_chans = dual_channel_active(drc) + 1; 401 mci = edac_mc_alloc(sizeof(*pvt), I82875P_NR_CSROWS(nr_chans), 402 nr_chans, 0); 403 404 if (!mci) { 405 rc = -ENOMEM; 406 goto fail0; 407 } 408 409 /* Keeps mci available after edac_mc_del_mc() till edac_mc_free() */ 410 kobject_get(&mci->edac_mci_kobj); 411 412 debugf3("%s(): init mci\n", __func__); 413 mci->dev = &pdev->dev; 414 mci->mtype_cap = MEM_FLAG_DDR; 415 mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED; 416 mci->edac_cap = EDAC_FLAG_UNKNOWN; 417 mci->mod_name = EDAC_MOD_STR; 418 mci->mod_ver = I82875P_REVISION; 419 mci->ctl_name = i82875p_devs[dev_idx].ctl_name; 420 mci->dev_name = pci_name(pdev); 421 mci->edac_check = i82875p_check; 422 mci->ctl_page_to_phys = NULL; 423 debugf3("%s(): init pvt\n", __func__); 424 pvt = (struct i82875p_pvt *)mci->pvt_info; 425 pvt->ovrfl_pdev = ovrfl_pdev; 426 pvt->ovrfl_window = ovrfl_window; 427 i82875p_init_csrows(mci, pdev, ovrfl_window, drc); 428 i82875p_get_error_info(mci, &discard); /* clear counters */ 429 430 /* Here we assume that we will never see multiple instances of this 431 * type of memory controller. The ID is therefore hardcoded to 0. 432 */ 433 if (edac_mc_add_mc(mci)) { 434 debugf3("%s(): failed edac_mc_add_mc()\n", __func__); 435 goto fail1; 436 } 437 438 /* allocating generic PCI control info */ 439 i82875p_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR); 440 if (!i82875p_pci) { 441 printk(KERN_WARNING 442 "%s(): Unable to create PCI control\n", 443 __func__); 444 printk(KERN_WARNING 445 "%s(): PCI error report via EDAC not setup\n", 446 __func__); 447 } 448 449 /* get this far and it's successful */ 450 debugf3("%s(): success\n", __func__); 451 return 0; 452 453 fail1: 454 kobject_put(&mci->edac_mci_kobj); 455 edac_mc_free(mci); 456 457 fail0: 458 iounmap(ovrfl_window); 459 pci_release_regions(ovrfl_pdev); 460 461 pci_disable_device(ovrfl_pdev); 462 /* NOTE: the ovrfl proc entry and pci_dev are intentionally left */ 463 return rc; 464 } 465 466 /* returns count (>= 0), or negative on error */ 467 static int __devinit i82875p_init_one(struct pci_dev *pdev, 468 const struct pci_device_id *ent) 469 { 470 int rc; 471 472 debugf0("%s()\n", __func__); 473 i82875p_printk(KERN_INFO, "i82875p init one\n"); 474 475 if (pci_enable_device(pdev) < 0) 476 return -EIO; 477 478 rc = i82875p_probe1(pdev, ent->driver_data); 479 480 if (mci_pdev == NULL) 481 mci_pdev = pci_dev_get(pdev); 482 483 return rc; 484 } 485 486 static void __devexit i82875p_remove_one(struct pci_dev *pdev) 487 { 488 struct mem_ctl_info *mci; 489 struct i82875p_pvt *pvt = NULL; 490 491 debugf0("%s()\n", __func__); 492 493 if (i82875p_pci) 494 edac_pci_release_generic_ctl(i82875p_pci); 495 496 if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL) 497 return; 498 499 pvt = (struct i82875p_pvt *)mci->pvt_info; 500 501 if (pvt->ovrfl_window) 502 iounmap(pvt->ovrfl_window); 503 504 if (pvt->ovrfl_pdev) { 505 #ifdef CORRECT_BIOS 506 pci_release_regions(pvt->ovrfl_pdev); 507 #endif /*CORRECT_BIOS */ 508 pci_disable_device(pvt->ovrfl_pdev); 509 pci_dev_put(pvt->ovrfl_pdev); 510 } 511 512 edac_mc_free(mci); 513 } 514 515 static const struct pci_device_id i82875p_pci_tbl[] __devinitdata = { 516 { 517 PCI_VEND_DEV(INTEL, 82875_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0, 518 I82875P}, 519 { 520 0, 521 } /* 0 terminated list. */ 522 }; 523 524 MODULE_DEVICE_TABLE(pci, i82875p_pci_tbl); 525 526 static struct pci_driver i82875p_driver = { 527 .name = EDAC_MOD_STR, 528 .probe = i82875p_init_one, 529 .remove = __devexit_p(i82875p_remove_one), 530 .id_table = i82875p_pci_tbl, 531 }; 532 533 static int __init i82875p_init(void) 534 { 535 int pci_rc; 536 537 debugf3("%s()\n", __func__); 538 539 /* Ensure that the OPSTATE is set correctly for POLL or NMI */ 540 opstate_init(); 541 542 pci_rc = pci_register_driver(&i82875p_driver); 543 544 if (pci_rc < 0) 545 goto fail0; 546 547 if (mci_pdev == NULL) { 548 mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL, 549 PCI_DEVICE_ID_INTEL_82875_0, NULL); 550 551 if (!mci_pdev) { 552 debugf0("875p pci_get_device fail\n"); 553 pci_rc = -ENODEV; 554 goto fail1; 555 } 556 557 pci_rc = i82875p_init_one(mci_pdev, i82875p_pci_tbl); 558 559 if (pci_rc < 0) { 560 debugf0("875p init fail\n"); 561 pci_rc = -ENODEV; 562 goto fail1; 563 } 564 } 565 566 return 0; 567 568 fail1: 569 pci_unregister_driver(&i82875p_driver); 570 571 fail0: 572 if (mci_pdev != NULL) 573 pci_dev_put(mci_pdev); 574 575 return pci_rc; 576 } 577 578 static void __exit i82875p_exit(void) 579 { 580 debugf3("%s()\n", __func__); 581 582 i82875p_remove_one(mci_pdev); 583 pci_dev_put(mci_pdev); 584 585 pci_unregister_driver(&i82875p_driver); 586 587 } 588 589 module_init(i82875p_init); 590 module_exit(i82875p_exit); 591 592 MODULE_LICENSE("GPL"); 593 MODULE_AUTHOR("Linux Networx (http://lnxi.com) Thayne Harbaugh"); 594 MODULE_DESCRIPTION("MC support for Intel 82875 memory hub controllers"); 595 596 module_param(edac_op_state, int, 0444); 597 MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI"); 598