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 "edac_mc.h" 22 23 #define I82875P_REVISION " Ver: 2.0.1 " __DATE__ 24 #define EDAC_MOD_STR "i82875p_edac" 25 26 #define i82875p_printk(level, fmt, arg...) \ 27 edac_printk(level, "i82875p", fmt, ##arg) 28 29 #define i82875p_mc_printk(mci, level, fmt, arg...) \ 30 edac_mc_chipset_printk(mci, level, "i82875p", fmt, ##arg) 31 32 #ifndef PCI_DEVICE_ID_INTEL_82875_0 33 #define PCI_DEVICE_ID_INTEL_82875_0 0x2578 34 #endif /* PCI_DEVICE_ID_INTEL_82875_0 */ 35 36 #ifndef PCI_DEVICE_ID_INTEL_82875_6 37 #define PCI_DEVICE_ID_INTEL_82875_6 0x257e 38 #endif /* PCI_DEVICE_ID_INTEL_82875_6 */ 39 40 /* four csrows in dual channel, eight in single channel */ 41 #define I82875P_NR_CSROWS(nr_chans) (8/(nr_chans)) 42 43 /* Intel 82875p register addresses - device 0 function 0 - DRAM Controller */ 44 #define I82875P_EAP 0x58 /* Error Address Pointer (32b) 45 * 46 * 31:12 block address 47 * 11:0 reserved 48 */ 49 50 #define I82875P_DERRSYN 0x5c /* DRAM Error Syndrome (8b) 51 * 52 * 7:0 DRAM ECC Syndrome 53 */ 54 55 #define I82875P_DES 0x5d /* DRAM Error Status (8b) 56 * 57 * 7:1 reserved 58 * 0 Error channel 0/1 59 */ 60 61 #define I82875P_ERRSTS 0xc8 /* Error Status Register (16b) 62 * 63 * 15:10 reserved 64 * 9 non-DRAM lock error (ndlock) 65 * 8 Sftwr Generated SMI 66 * 7 ECC UE 67 * 6 reserved 68 * 5 MCH detects unimplemented cycle 69 * 4 AGP access outside GA 70 * 3 Invalid AGP access 71 * 2 Invalid GA translation table 72 * 1 Unsupported AGP command 73 * 0 ECC CE 74 */ 75 76 #define I82875P_ERRCMD 0xca /* Error Command (16b) 77 * 78 * 15:10 reserved 79 * 9 SERR on non-DRAM lock 80 * 8 SERR on ECC UE 81 * 7 SERR on ECC CE 82 * 6 target abort on high exception 83 * 5 detect unimplemented cyc 84 * 4 AGP access outside of GA 85 * 3 SERR on invalid AGP access 86 * 2 invalid translation table 87 * 1 SERR on unsupported AGP command 88 * 0 reserved 89 */ 90 91 /* Intel 82875p register addresses - device 6 function 0 - DRAM Controller */ 92 #define I82875P_PCICMD6 0x04 /* PCI Command Register (16b) 93 * 94 * 15:10 reserved 95 * 9 fast back-to-back - ro 0 96 * 8 SERR enable - ro 0 97 * 7 addr/data stepping - ro 0 98 * 6 parity err enable - ro 0 99 * 5 VGA palette snoop - ro 0 100 * 4 mem wr & invalidate - ro 0 101 * 3 special cycle - ro 0 102 * 2 bus master - ro 0 103 * 1 mem access dev6 - 0(dis),1(en) 104 * 0 IO access dev3 - 0(dis),1(en) 105 */ 106 107 #define I82875P_BAR6 0x10 /* Mem Delays Base ADDR Reg (32b) 108 * 109 * 31:12 mem base addr [31:12] 110 * 11:4 address mask - ro 0 111 * 3 prefetchable - ro 0(non),1(pre) 112 * 2:1 mem type - ro 0 113 * 0 mem space - ro 0 114 */ 115 116 /* Intel 82875p MMIO register space - device 0 function 0 - MMR space */ 117 118 #define I82875P_DRB_SHIFT 26 /* 64MiB grain */ 119 #define I82875P_DRB 0x00 /* DRAM Row Boundary (8b x 8) 120 * 121 * 7 reserved 122 * 6:0 64MiB row boundary addr 123 */ 124 125 #define I82875P_DRA 0x10 /* DRAM Row Attribute (4b x 8) 126 * 127 * 7 reserved 128 * 6:4 row attr row 1 129 * 3 reserved 130 * 2:0 row attr row 0 131 * 132 * 000 = 4KiB 133 * 001 = 8KiB 134 * 010 = 16KiB 135 * 011 = 32KiB 136 */ 137 138 #define I82875P_DRC 0x68 /* DRAM Controller Mode (32b) 139 * 140 * 31:30 reserved 141 * 29 init complete 142 * 28:23 reserved 143 * 22:21 nr chan 00=1,01=2 144 * 20 reserved 145 * 19:18 Data Integ Mode 00=none,01=ecc 146 * 17:11 reserved 147 * 10:8 refresh mode 148 * 7 reserved 149 * 6:4 mode select 150 * 3:2 reserved 151 * 1:0 DRAM type 01=DDR 152 */ 153 154 enum i82875p_chips { 155 I82875P = 0, 156 }; 157 158 struct i82875p_pvt { 159 struct pci_dev *ovrfl_pdev; 160 void __iomem *ovrfl_window; 161 }; 162 163 struct i82875p_dev_info { 164 const char *ctl_name; 165 }; 166 167 struct i82875p_error_info { 168 u16 errsts; 169 u32 eap; 170 u8 des; 171 u8 derrsyn; 172 u16 errsts2; 173 }; 174 175 static const struct i82875p_dev_info i82875p_devs[] = { 176 [I82875P] = { 177 .ctl_name = "i82875p" 178 }, 179 }; 180 181 static struct pci_dev *mci_pdev = NULL; /* init dev: in case that AGP code has 182 * already registered driver 183 */ 184 185 static int i82875p_registered = 1; 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 pci_read_config_dword(pdev, I82875P_EAP, &info->eap); 201 pci_read_config_byte(pdev, I82875P_DES, &info->des); 202 pci_read_config_byte(pdev, I82875P_DERRSYN, &info->derrsyn); 203 pci_read_config_word(pdev, I82875P_ERRSTS, &info->errsts2); 204 205 pci_write_bits16(pdev, I82875P_ERRSTS, 0x0081, 0x0081); 206 207 /* 208 * If the error is the same then we can for both reads then 209 * the first set of reads is valid. If there is a change then 210 * there is a CE no info and the second set of reads is valid 211 * and should be UE info. 212 */ 213 if (!(info->errsts2 & 0x0081)) 214 return; 215 216 if ((info->errsts ^ info->errsts2) & 0x0081) { 217 pci_read_config_dword(pdev, I82875P_EAP, &info->eap); 218 pci_read_config_byte(pdev, I82875P_DES, &info->des); 219 pci_read_config_byte(pdev, I82875P_DERRSYN, 220 &info->derrsyn); 221 } 222 } 223 224 static int i82875p_process_error_info(struct mem_ctl_info *mci, 225 struct i82875p_error_info *info, int handle_errors) 226 { 227 int row, multi_chan; 228 229 multi_chan = mci->csrows[0].nr_channels - 1; 230 231 if (!(info->errsts2 & 0x0081)) 232 return 0; 233 234 if (!handle_errors) 235 return 1; 236 237 if ((info->errsts ^ info->errsts2) & 0x0081) { 238 edac_mc_handle_ce_no_info(mci, "UE overwrote CE"); 239 info->errsts = info->errsts2; 240 } 241 242 info->eap >>= PAGE_SHIFT; 243 row = edac_mc_find_csrow_by_page(mci, info->eap); 244 245 if (info->errsts & 0x0080) 246 edac_mc_handle_ue(mci, info->eap, 0, row, "i82875p UE"); 247 else 248 edac_mc_handle_ce(mci, info->eap, 0, info->derrsyn, row, 249 multi_chan ? (info->des & 0x1) : 0, 250 "i82875p CE"); 251 252 return 1; 253 } 254 255 static void i82875p_check(struct mem_ctl_info *mci) 256 { 257 struct i82875p_error_info info; 258 259 debugf1("MC%d: %s()\n", mci->mc_idx, __func__); 260 i82875p_get_error_info(mci, &info); 261 i82875p_process_error_info(mci, &info, 1); 262 } 263 264 #ifdef CONFIG_PROC_FS 265 extern int pci_proc_attach_device(struct pci_dev *); 266 #endif 267 268 /* Return 0 on success or 1 on failure. */ 269 static int i82875p_setup_overfl_dev(struct pci_dev *pdev, 270 struct pci_dev **ovrfl_pdev, void __iomem **ovrfl_window) 271 { 272 struct pci_dev *dev; 273 void __iomem *window; 274 275 *ovrfl_pdev = NULL; 276 *ovrfl_window = NULL; 277 dev = pci_get_device(PCI_VEND_DEV(INTEL, 82875_6), NULL); 278 279 if (dev == NULL) { 280 /* Intel tells BIOS developers to hide device 6 which 281 * configures the overflow device access containing 282 * the DRBs - this is where we expose device 6. 283 * http://www.x86-secret.com/articles/tweak/pat/patsecrets-2.htm 284 */ 285 pci_write_bits8(pdev, 0xf4, 0x2, 0x2); 286 dev = pci_scan_single_device(pdev->bus, PCI_DEVFN(6, 0)); 287 288 if (dev == NULL) 289 return 1; 290 } 291 292 *ovrfl_pdev = dev; 293 294 #ifdef CONFIG_PROC_FS 295 if ((dev->procent == NULL) && pci_proc_attach_device(dev)) { 296 i82875p_printk(KERN_ERR, "%s(): Failed to attach overflow " 297 "device\n", __func__); 298 return 1; 299 } 300 #endif /* CONFIG_PROC_FS */ 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 = ioremap_nocache(pci_resource_start(dev, 0), 315 pci_resource_len(dev, 0)); 316 317 if (window == NULL) { 318 i82875p_printk(KERN_ERR, "%s(): Failed to ioremap bar6\n", 319 __func__); 320 goto fail1; 321 } 322 323 *ovrfl_window = window; 324 return 0; 325 326 fail1: 327 pci_release_regions(dev); 328 329 #ifdef CORRECT_BIOS 330 fail0: 331 pci_disable_device(dev); 332 #endif 333 /* NOTE: the ovrfl proc entry and pci_dev are intentionally left */ 334 return 1; 335 } 336 337 338 /* Return 1 if dual channel mode is active. Else return 0. */ 339 static inline int dual_channel_active(u32 drc) 340 { 341 return (drc >> 21) & 0x1; 342 } 343 344 345 static void i82875p_init_csrows(struct mem_ctl_info *mci, 346 struct pci_dev *pdev, void __iomem *ovrfl_window, u32 drc) 347 { 348 struct csrow_info *csrow; 349 unsigned long last_cumul_size; 350 u8 value; 351 u32 drc_ddim; /* DRAM Data Integrity Mode 0=none,2=edac */ 352 u32 cumul_size; 353 int index; 354 355 drc_ddim = (drc >> 18) & 0x1; 356 last_cumul_size = 0; 357 358 /* The dram row boundary (DRB) reg values are boundary address 359 * for each DRAM row with a granularity of 32 or 64MB (single/dual 360 * channel operation). DRB regs are cumulative; therefore DRB7 will 361 * contain the total memory contained in all eight rows. 362 */ 363 364 for (index = 0; index < mci->nr_csrows; index++) { 365 csrow = &mci->csrows[index]; 366 367 value = readb(ovrfl_window + I82875P_DRB + index); 368 cumul_size = value << (I82875P_DRB_SHIFT - PAGE_SHIFT); 369 debugf3("%s(): (%d) cumul_size 0x%x\n", __func__, index, 370 cumul_size); 371 if (cumul_size == last_cumul_size) 372 continue; /* not populated */ 373 374 csrow->first_page = last_cumul_size; 375 csrow->last_page = cumul_size - 1; 376 csrow->nr_pages = cumul_size - last_cumul_size; 377 last_cumul_size = cumul_size; 378 csrow->grain = 1 << 12; /* I82875P_EAP has 4KiB reolution */ 379 csrow->mtype = MEM_DDR; 380 csrow->dtype = DEV_UNKNOWN; 381 csrow->edac_mode = drc_ddim ? EDAC_SECDED : EDAC_NONE; 382 } 383 } 384 385 static int i82875p_probe1(struct pci_dev *pdev, int dev_idx) 386 { 387 int rc = -ENODEV; 388 struct mem_ctl_info *mci; 389 struct i82875p_pvt *pvt; 390 struct pci_dev *ovrfl_pdev; 391 void __iomem *ovrfl_window; 392 u32 drc; 393 u32 nr_chans; 394 struct i82875p_error_info discard; 395 396 debugf0("%s()\n", __func__); 397 ovrfl_pdev = pci_get_device(PCI_VEND_DEV(INTEL, 82875_6), NULL); 398 399 if (i82875p_setup_overfl_dev(pdev, &ovrfl_pdev, &ovrfl_window)) 400 return -ENODEV; 401 drc = readl(ovrfl_window + I82875P_DRC); 402 nr_chans = dual_channel_active(drc) + 1; 403 mci = edac_mc_alloc(sizeof(*pvt), I82875P_NR_CSROWS(nr_chans), 404 nr_chans); 405 406 if (!mci) { 407 rc = -ENOMEM; 408 goto fail0; 409 } 410 411 debugf3("%s(): init mci\n", __func__); 412 mci->dev = &pdev->dev; 413 mci->mtype_cap = MEM_FLAG_DDR; 414 mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED; 415 mci->edac_cap = EDAC_FLAG_UNKNOWN; 416 mci->mod_name = EDAC_MOD_STR; 417 mci->mod_ver = I82875P_REVISION; 418 mci->ctl_name = i82875p_devs[dev_idx].ctl_name; 419 mci->edac_check = i82875p_check; 420 mci->ctl_page_to_phys = NULL; 421 debugf3("%s(): init pvt\n", __func__); 422 pvt = (struct i82875p_pvt *) mci->pvt_info; 423 pvt->ovrfl_pdev = ovrfl_pdev; 424 pvt->ovrfl_window = ovrfl_window; 425 i82875p_init_csrows(mci, pdev, ovrfl_window, drc); 426 i82875p_get_error_info(mci, &discard); /* clear counters */ 427 428 /* Here we assume that we will never see multiple instances of this 429 * type of memory controller. The ID is therefore hardcoded to 0. 430 */ 431 if (edac_mc_add_mc(mci,0)) { 432 debugf3("%s(): failed edac_mc_add_mc()\n", __func__); 433 goto fail1; 434 } 435 436 /* get this far and it's successful */ 437 debugf3("%s(): success\n", __func__); 438 return 0; 439 440 fail1: 441 edac_mc_free(mci); 442 443 fail0: 444 iounmap(ovrfl_window); 445 pci_release_regions(ovrfl_pdev); 446 447 pci_disable_device(ovrfl_pdev); 448 /* NOTE: the ovrfl proc entry and pci_dev are intentionally left */ 449 return rc; 450 } 451 452 /* returns count (>= 0), or negative on error */ 453 static int __devinit i82875p_init_one(struct pci_dev *pdev, 454 const struct pci_device_id *ent) 455 { 456 int rc; 457 458 debugf0("%s()\n", __func__); 459 i82875p_printk(KERN_INFO, "i82875p init one\n"); 460 461 if (pci_enable_device(pdev) < 0) 462 return -EIO; 463 464 rc = i82875p_probe1(pdev, ent->driver_data); 465 466 if (mci_pdev == NULL) 467 mci_pdev = pci_dev_get(pdev); 468 469 return rc; 470 } 471 472 static void __devexit i82875p_remove_one(struct pci_dev *pdev) 473 { 474 struct mem_ctl_info *mci; 475 struct i82875p_pvt *pvt = NULL; 476 477 debugf0("%s()\n", __func__); 478 479 if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL) 480 return; 481 482 pvt = (struct i82875p_pvt *) mci->pvt_info; 483 484 if (pvt->ovrfl_window) 485 iounmap(pvt->ovrfl_window); 486 487 if (pvt->ovrfl_pdev) { 488 #ifdef CORRECT_BIOS 489 pci_release_regions(pvt->ovrfl_pdev); 490 #endif /*CORRECT_BIOS */ 491 pci_disable_device(pvt->ovrfl_pdev); 492 pci_dev_put(pvt->ovrfl_pdev); 493 } 494 495 edac_mc_free(mci); 496 } 497 498 static const struct pci_device_id i82875p_pci_tbl[] __devinitdata = { 499 { 500 PCI_VEND_DEV(INTEL, 82875_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0, 501 I82875P 502 }, 503 { 504 0, 505 } /* 0 terminated list. */ 506 }; 507 508 MODULE_DEVICE_TABLE(pci, i82875p_pci_tbl); 509 510 static struct pci_driver i82875p_driver = { 511 .name = EDAC_MOD_STR, 512 .probe = i82875p_init_one, 513 .remove = __devexit_p(i82875p_remove_one), 514 .id_table = i82875p_pci_tbl, 515 }; 516 517 static int __init i82875p_init(void) 518 { 519 int pci_rc; 520 521 debugf3("%s()\n", __func__); 522 pci_rc = pci_register_driver(&i82875p_driver); 523 524 if (pci_rc < 0) 525 goto fail0; 526 527 if (mci_pdev == NULL) { 528 mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL, 529 PCI_DEVICE_ID_INTEL_82875_0, NULL); 530 531 if (!mci_pdev) { 532 debugf0("875p pci_get_device fail\n"); 533 pci_rc = -ENODEV; 534 goto fail1; 535 } 536 537 pci_rc = i82875p_init_one(mci_pdev, i82875p_pci_tbl); 538 539 if (pci_rc < 0) { 540 debugf0("875p init fail\n"); 541 pci_rc = -ENODEV; 542 goto fail1; 543 } 544 } 545 546 return 0; 547 548 fail1: 549 pci_unregister_driver(&i82875p_driver); 550 551 fail0: 552 if (mci_pdev != NULL) 553 pci_dev_put(mci_pdev); 554 555 return pci_rc; 556 } 557 558 static void __exit i82875p_exit(void) 559 { 560 debugf3("%s()\n", __func__); 561 562 pci_unregister_driver(&i82875p_driver); 563 564 if (!i82875p_registered) { 565 i82875p_remove_one(mci_pdev); 566 pci_dev_put(mci_pdev); 567 } 568 } 569 570 module_init(i82875p_init); 571 module_exit(i82875p_exit); 572 573 MODULE_LICENSE("GPL"); 574 MODULE_AUTHOR("Linux Networx (http://lnxi.com) Thayne Harbaugh"); 575 MODULE_DESCRIPTION("MC support for Intel 82875 memory hub controllers"); 576