[PATCH] EDAC: e752x byte access fix
[linux-3.10.git] / drivers / edac / e752x_edac.c
1 /*
2  * Intel e752x Memory Controller kernel module
3  * (C) 2004 Linux Networx (http://lnxi.com)
4  * This file may be distributed under the terms of the
5  * GNU General Public License.
6  *
7  * See "enum e752x_chips" below for supported chipsets
8  *
9  * Written by Tom Zimmerman
10  *
11  * Contributors:
12  *      Thayne Harbaugh at realmsys.com (?)
13  *      Wang Zhenyu at intel.com
14  *      Dave Jiang at mvista.com
15  *
16  * $Id: edac_e752x.c,v 1.5.2.11 2005/10/05 00:43:44 dsp_llnl Exp $
17  *
18  */
19
20 #include <linux/module.h>
21 #include <linux/init.h>
22 #include <linux/pci.h>
23 #include <linux/pci_ids.h>
24 #include <linux/slab.h>
25 #include "edac_mc.h"
26
27 #define E752X_REVISION  " Ver: 2.0.1 " __DATE__
28 #define EDAC_MOD_STR    "e752x_edac"
29
30 static int force_function_unhide;
31
32 #define e752x_printk(level, fmt, arg...) \
33         edac_printk(level, "e752x", fmt, ##arg)
34
35 #define e752x_mc_printk(mci, level, fmt, arg...) \
36         edac_mc_chipset_printk(mci, level, "e752x", fmt, ##arg)
37
38 #ifndef PCI_DEVICE_ID_INTEL_7520_0
39 #define PCI_DEVICE_ID_INTEL_7520_0      0x3590
40 #endif                          /* PCI_DEVICE_ID_INTEL_7520_0      */
41
42 #ifndef PCI_DEVICE_ID_INTEL_7520_1_ERR
43 #define PCI_DEVICE_ID_INTEL_7520_1_ERR  0x3591
44 #endif                          /* PCI_DEVICE_ID_INTEL_7520_1_ERR  */
45
46 #ifndef PCI_DEVICE_ID_INTEL_7525_0
47 #define PCI_DEVICE_ID_INTEL_7525_0      0x359E
48 #endif                          /* PCI_DEVICE_ID_INTEL_7525_0      */
49
50 #ifndef PCI_DEVICE_ID_INTEL_7525_1_ERR
51 #define PCI_DEVICE_ID_INTEL_7525_1_ERR  0x3593
52 #endif                          /* PCI_DEVICE_ID_INTEL_7525_1_ERR  */
53
54 #ifndef PCI_DEVICE_ID_INTEL_7320_0
55 #define PCI_DEVICE_ID_INTEL_7320_0      0x3592
56 #endif                          /* PCI_DEVICE_ID_INTEL_7320_0 */
57
58 #ifndef PCI_DEVICE_ID_INTEL_7320_1_ERR
59 #define PCI_DEVICE_ID_INTEL_7320_1_ERR  0x3593
60 #endif                          /* PCI_DEVICE_ID_INTEL_7320_1_ERR */
61
62 #define E752X_NR_CSROWS         8       /* number of csrows */
63
64 /* E752X register addresses - device 0 function 0 */
65 #define E752X_DRB               0x60    /* DRAM row boundary register (8b) */
66 #define E752X_DRA               0x70    /* DRAM row attribute register (8b) */
67                                         /*
68                                          * 31:30   Device width row 7
69                                          *      01=x8 10=x4 11=x8 DDR2
70                                          * 27:26   Device width row 6
71                                          * 23:22   Device width row 5
72                                          * 19:20   Device width row 4
73                                          * 15:14   Device width row 3
74                                          * 11:10   Device width row 2
75                                          *  7:6    Device width row 1
76                                          *  3:2    Device width row 0
77                                          */
78 #define E752X_DRC               0x7C    /* DRAM controller mode reg (32b) */
79                                         /* FIXME:IS THIS RIGHT? */
80                                         /*
81                                          * 22    Number channels 0=1,1=2
82                                          * 19:18 DRB Granularity 32/64MB
83                                          */
84 #define E752X_DRM               0x80    /* Dimm mapping register */
85 #define E752X_DDRCSR            0x9A    /* DDR control and status reg (16b) */
86                                         /*
87                                          * 14:12 1 single A, 2 single B, 3 dual
88                                          */
89 #define E752X_TOLM              0xC4    /* DRAM top of low memory reg (16b) */
90 #define E752X_REMAPBASE         0xC6    /* DRAM remap base address reg (16b) */
91 #define E752X_REMAPLIMIT        0xC8    /* DRAM remap limit address reg (16b) */
92 #define E752X_REMAPOFFSET       0xCA    /* DRAM remap limit offset reg (16b) */
93
94 /* E752X register addresses - device 0 function 1 */
95 #define E752X_FERR_GLOBAL       0x40    /* Global first error register (32b) */
96 #define E752X_NERR_GLOBAL       0x44    /* Global next error register (32b) */
97 #define E752X_HI_FERR           0x50    /* Hub interface first error reg (8b) */
98 #define E752X_HI_NERR           0x52    /* Hub interface next error reg (8b) */
99 #define E752X_HI_ERRMASK        0x54    /* Hub interface error mask reg (8b) */
100 #define E752X_HI_SMICMD         0x5A    /* Hub interface SMI command reg (8b) */
101 #define E752X_SYSBUS_FERR       0x60    /* System buss first error reg (16b) */
102 #define E752X_SYSBUS_NERR       0x62    /* System buss next error reg (16b) */
103 #define E752X_SYSBUS_ERRMASK    0x64    /* System buss error mask reg (16b) */
104 #define E752X_SYSBUS_SMICMD     0x6A    /* System buss SMI command reg (16b) */
105 #define E752X_BUF_FERR          0x70    /* Memory buffer first error reg (8b) */
106 #define E752X_BUF_NERR          0x72    /* Memory buffer next error reg (8b) */
107 #define E752X_BUF_ERRMASK       0x74    /* Memory buffer error mask reg (8b) */
108 #define E752X_BUF_SMICMD        0x7A    /* Memory buffer SMI command reg (8b) */
109 #define E752X_DRAM_FERR         0x80    /* DRAM first error register (16b) */
110 #define E752X_DRAM_NERR         0x82    /* DRAM next error register (16b) */
111 #define E752X_DRAM_ERRMASK      0x84    /* DRAM error mask register (8b) */
112 #define E752X_DRAM_SMICMD       0x8A    /* DRAM SMI command register (8b) */
113 #define E752X_DRAM_RETR_ADD     0xAC    /* DRAM Retry address register (32b) */
114 #define E752X_DRAM_SEC1_ADD     0xA0    /* DRAM first correctable memory */
115                                         /*     error address register (32b) */
116                                         /*
117                                          * 31    Reserved
118                                          * 30:2  CE address (64 byte block 34:6)
119                                          * 1     Reserved
120                                          * 0     HiLoCS
121                                          */
122 #define E752X_DRAM_SEC2_ADD     0xC8    /* DRAM first correctable memory */
123                                         /*     error address register (32b) */
124                                         /*
125                                          * 31    Reserved
126                                          * 30:2  CE address (64 byte block 34:6)
127                                          * 1     Reserved
128                                          * 0     HiLoCS
129                                          */
130 #define E752X_DRAM_DED_ADD      0xA4    /* DRAM first uncorrectable memory */
131                                         /*     error address register (32b) */
132                                         /*
133                                          * 31    Reserved
134                                          * 30:2  CE address (64 byte block 34:6)
135                                          * 1     Reserved
136                                          * 0     HiLoCS
137                                          */
138 #define E752X_DRAM_SCRB_ADD     0xA8    /* DRAM first uncorrectable scrub memory */
139                                         /*     error address register (32b) */
140                                         /*
141                                          * 31    Reserved
142                                          * 30:2  CE address (64 byte block 34:6)
143                                          * 1     Reserved
144                                          * 0     HiLoCS
145                                          */
146 #define E752X_DRAM_SEC1_SYNDROME 0xC4   /* DRAM first correctable memory */
147                                         /*     error syndrome register (16b) */
148 #define E752X_DRAM_SEC2_SYNDROME 0xC6   /* DRAM second correctable memory */
149                                         /*     error syndrome register (16b) */
150 #define E752X_DEVPRES1          0xF4    /* Device Present 1 register (8b) */
151
152 /* ICH5R register addresses - device 30 function 0 */
153 #define ICH5R_PCI_STAT          0x06    /* PCI status register (16b) */
154 #define ICH5R_PCI_2ND_STAT      0x1E    /* PCI status secondary reg (16b) */
155 #define ICH5R_PCI_BRIDGE_CTL    0x3E    /* PCI bridge control register (16b) */
156
157 enum e752x_chips {
158         E7520 = 0,
159         E7525 = 1,
160         E7320 = 2
161 };
162
163 struct e752x_pvt {
164         struct pci_dev *bridge_ck;
165         struct pci_dev *dev_d0f0;
166         struct pci_dev *dev_d0f1;
167         u32 tolm;
168         u32 remapbase;
169         u32 remaplimit;
170         int mc_symmetric;
171         u8 map[8];
172         int map_type;
173         const struct e752x_dev_info *dev_info;
174 };
175
176 struct e752x_dev_info {
177         u16 err_dev;
178         u16 ctl_dev;
179         const char *ctl_name;
180 };
181
182 struct e752x_error_info {
183         u32 ferr_global;
184         u32 nerr_global;
185         u8 hi_ferr;
186         u8 hi_nerr;
187         u16 sysbus_ferr;
188         u16 sysbus_nerr;
189         u8 buf_ferr;
190         u8 buf_nerr;
191         u16 dram_ferr;
192         u16 dram_nerr;
193         u32 dram_sec1_add;
194         u32 dram_sec2_add;
195         u16 dram_sec1_syndrome;
196         u16 dram_sec2_syndrome;
197         u32 dram_ded_add;
198         u32 dram_scrb_add;
199         u32 dram_retr_add;
200 };
201
202 static const struct e752x_dev_info e752x_devs[] = {
203         [E7520] = {
204                 .err_dev = PCI_DEVICE_ID_INTEL_7520_1_ERR,
205                 .ctl_dev = PCI_DEVICE_ID_INTEL_7520_0,
206                 .ctl_name = "E7520"
207         },
208         [E7525] = {
209                 .err_dev = PCI_DEVICE_ID_INTEL_7525_1_ERR,
210                 .ctl_dev = PCI_DEVICE_ID_INTEL_7525_0,
211                 .ctl_name = "E7525"
212         },
213         [E7320] = {
214                 .err_dev = PCI_DEVICE_ID_INTEL_7320_1_ERR,
215                 .ctl_dev = PCI_DEVICE_ID_INTEL_7320_0,
216                 .ctl_name = "E7320"
217         },
218 };
219
220 static unsigned long ctl_page_to_phys(struct mem_ctl_info *mci,
221                 unsigned long page)
222 {
223         u32 remap;
224         struct e752x_pvt *pvt = (struct e752x_pvt *) mci->pvt_info;
225
226         debugf3("%s()\n", __func__);
227
228         if (page < pvt->tolm)
229                 return page;
230
231         if ((page >= 0x100000) && (page < pvt->remapbase))
232                 return page;
233
234         remap = (page - pvt->tolm) + pvt->remapbase;
235
236         if (remap < pvt->remaplimit)
237                 return remap;
238
239         e752x_printk(KERN_ERR, "Invalid page %lx - out of range\n", page);
240         return pvt->tolm - 1;
241 }
242
243 static void do_process_ce(struct mem_ctl_info *mci, u16 error_one,
244                 u32 sec1_add, u16 sec1_syndrome)
245 {
246         u32 page;
247         int row;
248         int channel;
249         int i;
250         struct e752x_pvt *pvt = (struct e752x_pvt *) mci->pvt_info;
251
252         debugf3("%s()\n", __func__);
253
254         /* convert the addr to 4k page */
255         page = sec1_add >> (PAGE_SHIFT - 4);
256
257         /* FIXME - check for -1 */
258         if (pvt->mc_symmetric) {
259                 /* chip select are bits 14 & 13 */
260                 row = ((page >> 1) & 3);
261                 e752x_printk(KERN_WARNING,
262                         "Test row %d Table %d %d %d %d %d %d %d %d\n", row,
263                         pvt->map[0], pvt->map[1], pvt->map[2], pvt->map[3],
264                         pvt->map[4], pvt->map[5], pvt->map[6], pvt->map[7]);
265
266                 /* test for channel remapping */
267                 for (i = 0; i < 8; i++) {
268                         if (pvt->map[i] == row)
269                                 break;
270                 }
271
272                 e752x_printk(KERN_WARNING, "Test computed row %d\n", i);
273
274                 if (i < 8)
275                         row = i;
276                 else
277                         e752x_mc_printk(mci, KERN_WARNING,
278                                 "row %d not found in remap table\n", row);
279         } else
280                 row = edac_mc_find_csrow_by_page(mci, page);
281
282         /* 0 = channel A, 1 = channel B */
283         channel = !(error_one & 1);
284
285         if (!pvt->map_type)
286                 row = 7 - row;
287
288         edac_mc_handle_ce(mci, page, 0, sec1_syndrome, row, channel,
289                 "e752x CE");
290 }
291
292 static inline void process_ce(struct mem_ctl_info *mci, u16 error_one,
293                 u32 sec1_add, u16 sec1_syndrome, int *error_found,
294                 int handle_error)
295 {
296         *error_found = 1;
297
298         if (handle_error)
299                 do_process_ce(mci, error_one, sec1_add, sec1_syndrome);
300 }
301
302 static void do_process_ue(struct mem_ctl_info *mci, u16 error_one,
303                 u32 ded_add, u32 scrb_add)
304 {
305         u32 error_2b, block_page;
306         int row;
307         struct e752x_pvt *pvt = (struct e752x_pvt *) mci->pvt_info;
308
309         debugf3("%s()\n", __func__);
310
311         if (error_one & 0x0202) {
312                 error_2b = ded_add;
313
314                 /* convert to 4k address */
315                 block_page = error_2b >> (PAGE_SHIFT - 4);
316
317                 row = pvt->mc_symmetric ?
318                         /* chip select are bits 14 & 13 */
319                         ((block_page >> 1) & 3) :
320                         edac_mc_find_csrow_by_page(mci, block_page);
321
322                 edac_mc_handle_ue(mci, block_page, 0, row,
323                         "e752x UE from Read");
324         }
325         if (error_one & 0x0404) {
326                 error_2b = scrb_add;
327
328                 /* convert to 4k address */
329                 block_page = error_2b >> (PAGE_SHIFT - 4);
330
331                 row = pvt->mc_symmetric ?
332                         /* chip select are bits 14 & 13 */
333                         ((block_page >> 1) & 3) :
334                         edac_mc_find_csrow_by_page(mci, block_page);
335
336                 edac_mc_handle_ue(mci, block_page, 0, row,
337                                 "e752x UE from Scruber");
338         }
339 }
340
341 static inline void process_ue(struct mem_ctl_info *mci, u16 error_one,
342                 u32 ded_add, u32 scrb_add, int *error_found, int handle_error)
343 {
344         *error_found = 1;
345
346         if (handle_error)
347                 do_process_ue(mci, error_one, ded_add, scrb_add);
348 }
349
350 static inline void process_ue_no_info_wr(struct mem_ctl_info *mci,
351                 int *error_found, int handle_error)
352 {
353         *error_found = 1;
354
355         if (!handle_error)
356                 return;
357
358         debugf3("%s()\n", __func__);
359         edac_mc_handle_ue_no_info(mci, "e752x UE log memory write");
360 }
361
362 static void do_process_ded_retry(struct mem_ctl_info *mci, u16 error,
363                 u32 retry_add)
364 {
365         u32 error_1b, page;
366         int row;
367         struct e752x_pvt *pvt = (struct e752x_pvt *) mci->pvt_info;
368
369         error_1b = retry_add;
370         page = error_1b >> (PAGE_SHIFT - 4); /* convert the addr to 4k page */
371         row = pvt->mc_symmetric ?
372                 ((page >> 1) & 3) : /* chip select are bits 14 & 13 */
373                 edac_mc_find_csrow_by_page(mci, page);
374         e752x_mc_printk(mci, KERN_WARNING,
375                 "CE page 0x%lx, row %d : Memory read retry\n",
376                 (long unsigned int) page, row);
377 }
378
379 static inline void process_ded_retry(struct mem_ctl_info *mci, u16 error,
380                 u32 retry_add, int *error_found, int handle_error)
381 {
382         *error_found = 1;
383
384         if (handle_error)
385                 do_process_ded_retry(mci, error, retry_add);
386 }
387
388 static inline void process_threshold_ce(struct mem_ctl_info *mci, u16 error,
389                 int *error_found, int handle_error)
390 {
391         *error_found = 1;
392
393         if (handle_error)
394                 e752x_mc_printk(mci, KERN_WARNING, "Memory threshold CE\n");
395 }
396
397 static char *global_message[11] = {
398         "PCI Express C1", "PCI Express C", "PCI Express B1",
399         "PCI Express B", "PCI Express A1", "PCI Express A",
400         "DMA Controler", "HUB Interface", "System Bus",
401         "DRAM Controler", "Internal Buffer"
402 };
403
404 static char *fatal_message[2] = { "Non-Fatal ", "Fatal " };
405
406 static void do_global_error(int fatal, u32 errors)
407 {
408         int i;
409
410         for (i = 0; i < 11; i++) {
411                 if (errors & (1 << i))
412                         e752x_printk(KERN_WARNING, "%sError %s\n",
413                                 fatal_message[fatal], global_message[i]);
414         }
415 }
416
417 static inline void global_error(int fatal, u32 errors, int *error_found,
418                 int handle_error)
419 {
420         *error_found = 1;
421
422         if (handle_error)
423                 do_global_error(fatal, errors);
424 }
425
426 static char *hub_message[7] = {
427         "HI Address or Command Parity", "HI Illegal Access",
428         "HI Internal Parity", "Out of Range Access",
429         "HI Data Parity", "Enhanced Config Access",
430         "Hub Interface Target Abort"
431 };
432
433 static void do_hub_error(int fatal, u8 errors)
434 {
435         int i;
436
437         for (i = 0; i < 7; i++) {
438                 if (errors & (1 << i))
439                         e752x_printk(KERN_WARNING, "%sError %s\n",
440                                 fatal_message[fatal], hub_message[i]);
441         }
442 }
443
444 static inline void hub_error(int fatal, u8 errors, int *error_found,
445                 int handle_error)
446 {
447         *error_found = 1;
448
449         if (handle_error)
450                 do_hub_error(fatal, errors);
451 }
452
453 static char *membuf_message[4] = {
454         "Internal PMWB to DRAM parity",
455         "Internal PMWB to System Bus Parity",
456         "Internal System Bus or IO to PMWB Parity",
457         "Internal DRAM to PMWB Parity"
458 };
459
460 static void do_membuf_error(u8 errors)
461 {
462         int i;
463
464         for (i = 0; i < 4; i++) {
465                 if (errors & (1 << i))
466                         e752x_printk(KERN_WARNING, "Non-Fatal Error %s\n",
467                                 membuf_message[i]);
468         }
469 }
470
471 static inline void membuf_error(u8 errors, int *error_found, int handle_error)
472 {
473         *error_found = 1;
474
475         if (handle_error)
476                 do_membuf_error(errors);
477 }
478
479 static char *sysbus_message[10] = {
480         "Addr or Request Parity",
481         "Data Strobe Glitch",
482         "Addr Strobe Glitch",
483         "Data Parity",
484         "Addr Above TOM",
485         "Non DRAM Lock Error",
486         "MCERR", "BINIT",
487         "Memory Parity",
488         "IO Subsystem Parity"
489 };
490
491 static void do_sysbus_error(int fatal, u32 errors)
492 {
493         int i;
494
495         for (i = 0; i < 10; i++) {
496                 if (errors & (1 << i))
497                         e752x_printk(KERN_WARNING, "%sError System Bus %s\n",
498                                 fatal_message[fatal], sysbus_message[i]);
499         }
500 }
501
502 static inline void sysbus_error(int fatal, u32 errors, int *error_found,
503                 int handle_error)
504 {
505         *error_found = 1;
506
507         if (handle_error)
508                 do_sysbus_error(fatal, errors);
509 }
510
511 static void e752x_check_hub_interface(struct e752x_error_info *info,
512                 int *error_found, int handle_error)
513 {
514         u8 stat8;
515
516         //pci_read_config_byte(dev,E752X_HI_FERR,&stat8);
517
518         stat8 = info->hi_ferr;
519
520         if(stat8 & 0x7f) { /* Error, so process */
521                 stat8 &= 0x7f;
522
523                 if(stat8 & 0x2b)
524                         hub_error(1, stat8 & 0x2b, error_found, handle_error);
525
526                 if(stat8 & 0x54)
527                         hub_error(0, stat8 & 0x54, error_found, handle_error);
528         }
529
530         //pci_read_config_byte(dev,E752X_HI_NERR,&stat8);
531
532         stat8 = info->hi_nerr;
533
534         if(stat8 & 0x7f) { /* Error, so process */
535                 stat8 &= 0x7f;
536
537                 if (stat8 & 0x2b)
538                         hub_error(1, stat8 & 0x2b, error_found, handle_error);
539
540                 if(stat8 & 0x54)
541                         hub_error(0, stat8 & 0x54, error_found, handle_error);
542         }
543 }
544
545 static void e752x_check_sysbus(struct e752x_error_info *info,
546                 int *error_found, int handle_error)
547 {
548         u32 stat32, error32;
549
550         //pci_read_config_dword(dev,E752X_SYSBUS_FERR,&stat32);
551         stat32 = info->sysbus_ferr + (info->sysbus_nerr << 16);
552
553         if (stat32 == 0)
554                 return;  /* no errors */
555
556         error32 = (stat32 >> 16) & 0x3ff;
557         stat32 = stat32 & 0x3ff;
558
559         if(stat32 & 0x087)
560                 sysbus_error(1, stat32 & 0x087, error_found, handle_error);
561
562         if(stat32 & 0x378)
563                 sysbus_error(0, stat32 & 0x378, error_found, handle_error);
564
565         if(error32 & 0x087)
566                 sysbus_error(1, error32 & 0x087, error_found, handle_error);
567
568         if(error32 & 0x378)
569                 sysbus_error(0, error32 & 0x378, error_found, handle_error);
570 }
571
572 static void e752x_check_membuf (struct e752x_error_info *info,
573                 int *error_found, int handle_error)
574 {
575         u8 stat8;
576
577         stat8 = info->buf_ferr;
578
579         if (stat8 & 0x0f) { /* Error, so process */
580                 stat8 &= 0x0f;
581                 membuf_error(stat8, error_found, handle_error);
582         }
583
584         stat8 = info->buf_nerr;
585
586         if (stat8 & 0x0f) { /* Error, so process */
587                 stat8 &= 0x0f;
588                 membuf_error(stat8, error_found, handle_error);
589         }
590 }
591
592 static void e752x_check_dram (struct mem_ctl_info *mci,
593                 struct e752x_error_info *info, int *error_found,
594                 int handle_error)
595 {
596         u16 error_one, error_next;
597
598         error_one = info->dram_ferr;
599         error_next = info->dram_nerr;
600
601         /* decode and report errors */
602         if(error_one & 0x0101)  /* check first error correctable */
603                 process_ce(mci, error_one, info->dram_sec1_add,
604                            info->dram_sec1_syndrome, error_found,
605                            handle_error);
606
607         if(error_next & 0x0101)  /* check next error correctable */
608                 process_ce(mci, error_next, info->dram_sec2_add,
609                            info->dram_sec2_syndrome, error_found,
610                            handle_error);
611
612         if(error_one & 0x4040)
613                 process_ue_no_info_wr(mci, error_found, handle_error);
614
615         if(error_next & 0x4040)
616                 process_ue_no_info_wr(mci, error_found, handle_error);
617
618         if(error_one & 0x2020)
619                 process_ded_retry(mci, error_one, info->dram_retr_add,
620                                   error_found, handle_error);
621
622         if(error_next & 0x2020)
623                 process_ded_retry(mci, error_next, info->dram_retr_add,
624                                   error_found, handle_error);
625
626         if(error_one & 0x0808)
627                 process_threshold_ce(mci, error_one, error_found,
628                                      handle_error);
629
630         if(error_next & 0x0808)
631                 process_threshold_ce(mci, error_next, error_found,
632                                      handle_error);
633
634         if(error_one & 0x0606)
635                 process_ue(mci, error_one, info->dram_ded_add,
636                            info->dram_scrb_add, error_found, handle_error);
637
638         if(error_next & 0x0606)
639                 process_ue(mci, error_next, info->dram_ded_add,
640                            info->dram_scrb_add, error_found, handle_error);
641 }
642
643 static void e752x_get_error_info (struct mem_ctl_info *mci,
644                 struct e752x_error_info *info)
645 {
646         struct pci_dev *dev;
647         struct e752x_pvt *pvt;
648
649         memset(info, 0, sizeof(*info));
650         pvt = (struct e752x_pvt *) mci->pvt_info;
651         dev = pvt->dev_d0f1;
652         pci_read_config_dword(dev, E752X_FERR_GLOBAL, &info->ferr_global);
653
654         if (info->ferr_global) {
655                 pci_read_config_byte(dev, E752X_HI_FERR, &info->hi_ferr);
656                 pci_read_config_word(dev, E752X_SYSBUS_FERR,
657                                 &info->sysbus_ferr);
658                 pci_read_config_byte(dev, E752X_BUF_FERR, &info->buf_ferr);
659                 pci_read_config_word(dev, E752X_DRAM_FERR,
660                                 &info->dram_ferr);
661                 pci_read_config_dword(dev, E752X_DRAM_SEC1_ADD,
662                                 &info->dram_sec1_add);
663                 pci_read_config_word(dev, E752X_DRAM_SEC1_SYNDROME,
664                                 &info->dram_sec1_syndrome);
665                 pci_read_config_dword(dev, E752X_DRAM_DED_ADD,
666                                 &info->dram_ded_add);
667                 pci_read_config_dword(dev, E752X_DRAM_SCRB_ADD,
668                                 &info->dram_scrb_add);
669                 pci_read_config_dword(dev, E752X_DRAM_RETR_ADD,
670                                 &info->dram_retr_add);
671
672                 if (info->hi_ferr & 0x7f)
673                         pci_write_config_byte(dev, E752X_HI_FERR,
674                                         info->hi_ferr);
675
676                 if (info->sysbus_ferr)
677                         pci_write_config_word(dev, E752X_SYSBUS_FERR,
678                                         info->sysbus_ferr);
679
680                 if (info->buf_ferr & 0x0f)
681                         pci_write_config_byte(dev, E752X_BUF_FERR,
682                                         info->buf_ferr);
683
684                 if (info->dram_ferr)
685                         pci_write_bits16(pvt->bridge_ck, E752X_DRAM_FERR,
686                                         info->dram_ferr, info->dram_ferr);
687
688                 pci_write_config_dword(dev, E752X_FERR_GLOBAL,
689                                 info->ferr_global);
690         }
691
692         pci_read_config_dword(dev, E752X_NERR_GLOBAL, &info->nerr_global);
693
694         if (info->nerr_global) {
695                 pci_read_config_byte(dev, E752X_HI_NERR, &info->hi_nerr);
696                 pci_read_config_word(dev, E752X_SYSBUS_NERR,
697                                 &info->sysbus_nerr);
698                 pci_read_config_byte(dev, E752X_BUF_NERR, &info->buf_nerr);
699                 pci_read_config_word(dev, E752X_DRAM_NERR,
700                                 &info->dram_nerr);
701                 pci_read_config_dword(dev, E752X_DRAM_SEC2_ADD,
702                                 &info->dram_sec2_add);
703                 pci_read_config_word(dev, E752X_DRAM_SEC2_SYNDROME,
704                                 &info->dram_sec2_syndrome);
705
706                 if (info->hi_nerr & 0x7f)
707                         pci_write_config_byte(dev, E752X_HI_NERR,
708                                         info->hi_nerr);
709
710                 if (info->sysbus_nerr)
711                         pci_write_config_word(dev, E752X_SYSBUS_NERR,
712                                         info->sysbus_nerr);
713
714                 if (info->buf_nerr & 0x0f)
715                         pci_write_config_byte(dev, E752X_BUF_NERR,
716                                         info->buf_nerr);
717
718                 if (info->dram_nerr)
719                         pci_write_bits16(pvt->bridge_ck, E752X_DRAM_NERR,
720                                         info->dram_nerr, info->dram_nerr);
721
722                 pci_write_config_dword(dev, E752X_NERR_GLOBAL,
723                                 info->nerr_global);
724         }
725 }
726
727 static int e752x_process_error_info (struct mem_ctl_info *mci,
728                 struct e752x_error_info *info, int handle_errors)
729 {
730         u32 error32, stat32;
731         int error_found;
732
733         error_found = 0;
734         error32 = (info->ferr_global >> 18) & 0x3ff;
735         stat32 = (info->ferr_global >> 4) & 0x7ff;
736
737         if (error32)
738                 global_error(1, error32, &error_found, handle_errors);
739
740         if (stat32)
741                 global_error(0, stat32, &error_found, handle_errors);
742
743         error32 = (info->nerr_global >> 18) & 0x3ff;
744         stat32 = (info->nerr_global >> 4) & 0x7ff;
745
746         if (error32)
747                 global_error(1, error32, &error_found, handle_errors);
748
749         if (stat32)
750                 global_error(0, stat32, &error_found, handle_errors);
751
752         e752x_check_hub_interface(info, &error_found, handle_errors);
753         e752x_check_sysbus(info, &error_found, handle_errors);
754         e752x_check_membuf(info, &error_found, handle_errors);
755         e752x_check_dram(mci, info, &error_found, handle_errors);
756         return error_found;
757 }
758
759 static void e752x_check(struct mem_ctl_info *mci)
760 {
761         struct e752x_error_info info;
762
763         debugf3("%s()\n", __func__);
764         e752x_get_error_info(mci, &info);
765         e752x_process_error_info(mci, &info, 1);
766 }
767
768 /* Return 1 if dual channel mode is active.  Else return 0. */
769 static inline int dual_channel_active(u16 ddrcsr)
770 {
771         return (((ddrcsr >> 12) & 3) == 3);
772 }
773
774 static void e752x_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev,
775                 u16 ddrcsr)
776 {
777         struct csrow_info *csrow;
778         unsigned long last_cumul_size;
779         int index, mem_dev, drc_chan;
780         int drc_drbg;  /* DRB granularity 0=64mb, 1=128mb */
781         int drc_ddim;  /* DRAM Data Integrity Mode 0=none, 2=edac */
782         u8 value;
783         u32 dra, drc, cumul_size;
784
785         dra = 0;
786         for (index=0; index < 4; index++) {
787                 u8 dra_reg;
788                 pci_read_config_byte(pdev, E752X_DRA+index, &dra_reg);
789                 dra |= dra_reg << (index * 8);
790         }
791         pci_read_config_dword(pdev, E752X_DRC, &drc);
792         drc_chan = dual_channel_active(ddrcsr);
793         drc_drbg = drc_chan + 1;  /* 128 in dual mode, 64 in single */
794         drc_ddim = (drc >> 20) & 0x3;
795
796         /* The dram row boundary (DRB) reg values are boundary address for
797          * each DRAM row with a granularity of 64 or 128MB (single/dual
798          * channel operation).  DRB regs are cumulative; therefore DRB7 will
799          * contain the total memory contained in all eight rows.
800          */
801         for (last_cumul_size = index = 0; index < mci->nr_csrows; index++) {
802                 /* mem_dev 0=x8, 1=x4 */
803                 mem_dev = (dra >> (index * 4 + 2)) & 0x3;
804                 csrow = &mci->csrows[index];
805
806                 mem_dev = (mem_dev == 2);
807                 pci_read_config_byte(pdev, E752X_DRB + index, &value);
808                 /* convert a 128 or 64 MiB DRB to a page size. */
809                 cumul_size = value << (25 + drc_drbg - PAGE_SHIFT);
810                 debugf3("%s(): (%d) cumul_size 0x%x\n", __func__, index,
811                         cumul_size);
812                 if (cumul_size == last_cumul_size)
813                         continue;       /* not populated */
814
815                 csrow->first_page = last_cumul_size;
816                 csrow->last_page = cumul_size - 1;
817                 csrow->nr_pages = cumul_size - last_cumul_size;
818                 last_cumul_size = cumul_size;
819                 csrow->grain = 1 << 12; /* 4KiB - resolution of CELOG */
820                 csrow->mtype = MEM_RDDR;        /* only one type supported */
821                 csrow->dtype = mem_dev ? DEV_X4 : DEV_X8;
822
823                 /*
824                  * if single channel or x8 devices then SECDED
825                  * if dual channel and x4 then S4ECD4ED
826                  */
827                 if (drc_ddim) {
828                         if (drc_chan && mem_dev) {
829                                 csrow->edac_mode = EDAC_S4ECD4ED;
830                                 mci->edac_cap |= EDAC_FLAG_S4ECD4ED;
831                         } else {
832                                 csrow->edac_mode = EDAC_SECDED;
833                                 mci->edac_cap |= EDAC_FLAG_SECDED;
834                         }
835                 } else
836                         csrow->edac_mode = EDAC_NONE;
837         }
838 }
839
840 static void e752x_init_mem_map_table(struct pci_dev *pdev,
841                 struct e752x_pvt *pvt)
842 {
843         int index;
844         u8 value, last, row, stat8;
845
846         last = 0;
847         row = 0;
848
849         for (index = 0; index < 8; index += 2) {
850                 pci_read_config_byte(pdev, E752X_DRB + index, &value);
851                 /* test if there is a dimm in this slot */
852                 if (value == last) {
853                         /* no dimm in the slot, so flag it as empty */
854                         pvt->map[index] = 0xff;
855                         pvt->map[index + 1] = 0xff;
856                 } else {        /* there is a dimm in the slot */
857                         pvt->map[index] = row;
858                         row++;
859                         last = value;
860                         /* test the next value to see if the dimm is double
861                          * sided
862                          */
863                         pci_read_config_byte(pdev, E752X_DRB + index + 1,
864                                              &value);
865                         pvt->map[index + 1] = (value == last) ?
866                             0xff :      /* the dimm is single sided,
867                                            so flag as empty */
868                             row;        /* this is a double sided dimm
869                                            to save the next row # */
870                         row++;
871                         last = value;
872                 }
873         }
874
875         /* set the map type.  1 = normal, 0 = reversed */
876         pci_read_config_byte(pdev, E752X_DRM, &stat8);
877         pvt->map_type = ((stat8 & 0x0f) > ((stat8 >> 4) & 0x0f));
878 }
879
880 /* Return 0 on success or 1 on failure. */
881 static int e752x_get_devs(struct pci_dev *pdev, int dev_idx,
882                 struct e752x_pvt *pvt)
883 {
884         struct pci_dev *dev;
885
886         pvt->bridge_ck = pci_get_device(PCI_VENDOR_ID_INTEL,
887                                         pvt->dev_info->err_dev,
888                                         pvt->bridge_ck);
889
890         if (pvt->bridge_ck == NULL)
891                 pvt->bridge_ck = pci_scan_single_device(pdev->bus,
892                                                         PCI_DEVFN(0, 1));
893
894         if (pvt->bridge_ck == NULL) {
895                 e752x_printk(KERN_ERR, "error reporting device not found:"
896                        "vendor %x device 0x%x (broken BIOS?)\n",
897                        PCI_VENDOR_ID_INTEL, e752x_devs[dev_idx].err_dev);
898                 return 1;
899         }
900
901         dev = pci_get_device(PCI_VENDOR_ID_INTEL, e752x_devs[dev_idx].ctl_dev,
902                              NULL);
903
904         if (dev == NULL)
905                 goto fail;
906
907         pvt->dev_d0f0 = dev;
908         pvt->dev_d0f1 = pci_dev_get(pvt->bridge_ck);
909
910         return 0;
911
912 fail:
913         pci_dev_put(pvt->bridge_ck);
914         return 1;
915 }
916
917 static void e752x_init_error_reporting_regs(struct e752x_pvt *pvt)
918 {
919         struct pci_dev *dev;
920
921         dev = pvt->dev_d0f1;
922         /* Turn off error disable & SMI in case the BIOS turned it on */
923         pci_write_config_byte(dev, E752X_HI_ERRMASK, 0x00);
924         pci_write_config_byte(dev, E752X_HI_SMICMD, 0x00);
925         pci_write_config_word(dev, E752X_SYSBUS_ERRMASK, 0x00);
926         pci_write_config_word(dev, E752X_SYSBUS_SMICMD, 0x00);
927         pci_write_config_byte(dev, E752X_BUF_ERRMASK, 0x00);
928         pci_write_config_byte(dev, E752X_BUF_SMICMD, 0x00);
929         pci_write_config_byte(dev, E752X_DRAM_ERRMASK, 0x00);
930         pci_write_config_byte(dev, E752X_DRAM_SMICMD, 0x00);
931 }
932
933 static int e752x_probe1(struct pci_dev *pdev, int dev_idx)
934 {
935         u16 pci_data;
936         u8 stat8;
937         struct mem_ctl_info *mci;
938         struct e752x_pvt *pvt;
939         u16 ddrcsr;
940         int drc_chan;   /* Number of channels 0=1chan,1=2chan */
941         struct e752x_error_info discard;
942
943         debugf0("%s(): mci\n", __func__);
944         debugf0("Starting Probe1\n");
945
946         /* check to see if device 0 function 1 is enabled; if it isn't, we
947          * assume the BIOS has reserved it for a reason and is expecting
948          * exclusive access, we take care not to violate that assumption and
949          * fail the probe. */
950         pci_read_config_byte(pdev, E752X_DEVPRES1, &stat8);
951         if (!force_function_unhide && !(stat8 & (1 << 5))) {
952                 printk(KERN_INFO "Contact your BIOS vendor to see if the "
953                         "E752x error registers can be safely un-hidden\n");
954                 return -ENOMEM;
955         }
956         stat8 |= (1 << 5);
957         pci_write_config_byte(pdev, E752X_DEVPRES1, stat8);
958
959         pci_read_config_word(pdev, E752X_DDRCSR, &ddrcsr);
960         /* FIXME: should check >>12 or 0xf, true for all? */
961         /* Dual channel = 1, Single channel = 0 */
962         drc_chan = dual_channel_active(ddrcsr);
963
964         mci = edac_mc_alloc(sizeof(*pvt), E752X_NR_CSROWS, drc_chan + 1);
965
966         if (mci == NULL) {
967                 return -ENOMEM;
968         }
969
970         debugf3("%s(): init mci\n", __func__);
971         mci->mtype_cap = MEM_FLAG_RDDR;
972         mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED |
973             EDAC_FLAG_S4ECD4ED;
974         /* FIXME - what if different memory types are in different csrows? */
975         mci->mod_name = EDAC_MOD_STR;
976         mci->mod_ver = E752X_REVISION;
977         mci->dev = &pdev->dev;
978
979         debugf3("%s(): init pvt\n", __func__);
980         pvt = (struct e752x_pvt *) mci->pvt_info;
981         pvt->dev_info = &e752x_devs[dev_idx];
982         pvt->mc_symmetric = ((ddrcsr & 0x10) != 0);
983
984         if (e752x_get_devs(pdev, dev_idx, pvt)) {
985                 edac_mc_free(mci);
986                 return -ENODEV;
987         }
988
989         debugf3("%s(): more mci init\n", __func__);
990         mci->ctl_name = pvt->dev_info->ctl_name;
991         mci->edac_check = e752x_check;
992         mci->ctl_page_to_phys = ctl_page_to_phys;
993
994         e752x_init_csrows(mci, pdev, ddrcsr);
995         e752x_init_mem_map_table(pdev, pvt);
996
997         /* set the map type.  1 = normal, 0 = reversed */
998         pci_read_config_byte(pdev, E752X_DRM, &stat8);
999         pvt->map_type = ((stat8 & 0x0f) > ((stat8 >> 4) & 0x0f));
1000
1001         mci->edac_cap |= EDAC_FLAG_NONE;
1002         debugf3("%s(): tolm, remapbase, remaplimit\n", __func__);
1003
1004         /* load the top of low memory, remap base, and remap limit vars */
1005         pci_read_config_word(pdev, E752X_TOLM, &pci_data);
1006         pvt->tolm = ((u32) pci_data) << 4;
1007         pci_read_config_word(pdev, E752X_REMAPBASE, &pci_data);
1008         pvt->remapbase = ((u32) pci_data) << 14;
1009         pci_read_config_word(pdev, E752X_REMAPLIMIT, &pci_data);
1010         pvt->remaplimit = ((u32) pci_data) << 14;
1011         e752x_printk(KERN_INFO,
1012                 "tolm = %x, remapbase = %x, remaplimit = %x\n", pvt->tolm,
1013                 pvt->remapbase, pvt->remaplimit);
1014
1015         /* Here we assume that we will never see multiple instances of this
1016          * type of memory controller.  The ID is therefore hardcoded to 0.
1017          */
1018         if (edac_mc_add_mc(mci,0)) {
1019                 debugf3("%s(): failed edac_mc_add_mc()\n", __func__);
1020                 goto fail;
1021         }
1022
1023         e752x_init_error_reporting_regs(pvt);
1024         e752x_get_error_info(mci, &discard); /* clear other MCH errors */
1025
1026         /* get this far and it's successful */
1027         debugf3("%s(): success\n", __func__);
1028         return 0;
1029
1030 fail:
1031         pci_dev_put(pvt->dev_d0f0);
1032         pci_dev_put(pvt->dev_d0f1);
1033         pci_dev_put(pvt->bridge_ck);
1034         edac_mc_free(mci);
1035
1036         return -ENODEV;
1037 }
1038
1039 /* returns count (>= 0), or negative on error */
1040 static int __devinit e752x_init_one(struct pci_dev *pdev,
1041                 const struct pci_device_id *ent)
1042 {
1043         debugf0("%s()\n", __func__);
1044
1045         /* wake up and enable device */
1046         if(pci_enable_device(pdev) < 0)
1047                 return -EIO;
1048
1049         return e752x_probe1(pdev, ent->driver_data);
1050 }
1051
1052 static void __devexit e752x_remove_one(struct pci_dev *pdev)
1053 {
1054         struct mem_ctl_info *mci;
1055         struct e752x_pvt *pvt;
1056
1057         debugf0("%s()\n", __func__);
1058
1059         if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL)
1060                 return;
1061
1062         pvt = (struct e752x_pvt *) mci->pvt_info;
1063         pci_dev_put(pvt->dev_d0f0);
1064         pci_dev_put(pvt->dev_d0f1);
1065         pci_dev_put(pvt->bridge_ck);
1066         edac_mc_free(mci);
1067 }
1068
1069 static const struct pci_device_id e752x_pci_tbl[] __devinitdata = {
1070         {
1071                 PCI_VEND_DEV(INTEL, 7520_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
1072                 E7520
1073         },
1074         {
1075                 PCI_VEND_DEV(INTEL, 7525_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
1076                 E7525
1077         },
1078         {
1079                 PCI_VEND_DEV(INTEL, 7320_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
1080                 E7320
1081         },
1082         {
1083                 0,
1084         }       /* 0 terminated list. */
1085 };
1086
1087 MODULE_DEVICE_TABLE(pci, e752x_pci_tbl);
1088
1089 static struct pci_driver e752x_driver = {
1090         .name = EDAC_MOD_STR,
1091         .probe = e752x_init_one,
1092         .remove = __devexit_p(e752x_remove_one),
1093         .id_table = e752x_pci_tbl,
1094 };
1095
1096 static int __init e752x_init(void)
1097 {
1098         int pci_rc;
1099
1100         debugf3("%s()\n", __func__);
1101         pci_rc = pci_register_driver(&e752x_driver);
1102         return (pci_rc < 0) ? pci_rc : 0;
1103 }
1104
1105 static void __exit e752x_exit(void)
1106 {
1107         debugf3("%s()\n", __func__);
1108         pci_unregister_driver(&e752x_driver);
1109 }
1110
1111 module_init(e752x_init);
1112 module_exit(e752x_exit);
1113
1114 MODULE_LICENSE("GPL");
1115 MODULE_AUTHOR("Linux Networx (http://lnxi.com) Tom Zimmerman\n");
1116 MODULE_DESCRIPTION("MC support for Intel e752x memory controllers");
1117
1118 module_param(force_function_unhide, int, 0444);
1119 MODULE_PARM_DESC(force_function_unhide, "if BIOS sets Dev0:Fun1 up as hidden:"
1120 " 1=force unhide and hope BIOS doesn't fight driver for Dev0:Fun1 access");
1121