Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma
[linux-2.6-microblaze.git] / drivers / edac / i3200_edac.c
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_module.h"
17
18 #include <linux/io-64-nonatomic-lo-hi.h>
19
20 #define EDAC_MOD_STR        "i3200_edac"
21
22 #define PCI_DEVICE_ID_INTEL_3200_HB    0x29f0
23
24 #define I3200_DIMMS             4
25 #define I3200_RANKS             8
26 #define I3200_RANKS_PER_CHANNEL 4
27 #define I3200_CHANNELS          2
28
29 /* Intel 3200 register addresses - device 0 function 0 - DRAM Controller */
30
31 #define I3200_MCHBAR_LOW        0x48    /* MCH Memory Mapped Register BAR */
32 #define I3200_MCHBAR_HIGH       0x4c
33 #define I3200_MCHBAR_MASK       0xfffffc000ULL  /* bits 35:14 */
34 #define I3200_MMR_WINDOW_SIZE   16384
35
36 #define I3200_TOM               0xa0    /* Top of Memory (16b)
37                  *
38                  * 15:10 reserved
39                  *  9:0  total populated physical memory
40                  */
41 #define I3200_TOM_MASK          0x3ff   /* bits 9:0 */
42 #define I3200_TOM_SHIFT         26      /* 64MiB grain */
43
44 #define I3200_ERRSTS            0xc8    /* Error Status Register (16b)
45                  *
46                  * 15    reserved
47                  * 14    Isochronous TBWRR Run Behind FIFO Full
48                  *       (ITCV)
49                  * 13    Isochronous TBWRR Run Behind FIFO Put
50                  *       (ITSTV)
51                  * 12    reserved
52                  * 11    MCH Thermal Sensor Event
53                  *       for SMI/SCI/SERR (GTSE)
54                  * 10    reserved
55                  *  9    LOCK to non-DRAM Memory Flag (LCKF)
56                  *  8    reserved
57                  *  7    DRAM Throttle Flag (DTF)
58                  *  6:2  reserved
59                  *  1    Multi-bit DRAM ECC Error Flag (DMERR)
60                  *  0    Single-bit DRAM ECC Error Flag (DSERR)
61                  */
62 #define I3200_ERRSTS_UE         0x0002
63 #define I3200_ERRSTS_CE         0x0001
64 #define I3200_ERRSTS_BITS       (I3200_ERRSTS_UE | I3200_ERRSTS_CE)
65
66
67 /* Intel  MMIO register space - device 0 function 0 - MMR space */
68
69 #define I3200_C0DRB     0x200   /* Channel 0 DRAM Rank Boundary (16b x 4)
70                  *
71                  * 15:10 reserved
72                  *  9:0  Channel 0 DRAM Rank Boundary Address
73                  */
74 #define I3200_C1DRB     0x600   /* Channel 1 DRAM Rank Boundary (16b x 4) */
75 #define I3200_DRB_MASK  0x3ff   /* bits 9:0 */
76 #define I3200_DRB_SHIFT 26      /* 64MiB grain */
77
78 #define I3200_C0ECCERRLOG       0x280   /* Channel 0 ECC Error Log (64b)
79                  *
80                  * 63:48 Error Column Address (ERRCOL)
81                  * 47:32 Error Row Address (ERRROW)
82                  * 31:29 Error Bank Address (ERRBANK)
83                  * 28:27 Error Rank Address (ERRRANK)
84                  * 26:24 reserved
85                  * 23:16 Error Syndrome (ERRSYND)
86                  * 15: 2 reserved
87                  *    1  Multiple Bit Error Status (MERRSTS)
88                  *    0  Correctable Error Status (CERRSTS)
89                  */
90 #define I3200_C1ECCERRLOG               0x680   /* Chan 1 ECC Error Log (64b) */
91 #define I3200_ECCERRLOG_CE              0x1
92 #define I3200_ECCERRLOG_UE              0x2
93 #define I3200_ECCERRLOG_RANK_BITS       0x18000000
94 #define I3200_ECCERRLOG_RANK_SHIFT      27
95 #define I3200_ECCERRLOG_SYNDROME_BITS   0xff0000
96 #define I3200_ECCERRLOG_SYNDROME_SHIFT  16
97 #define I3200_CAPID0                    0xe0    /* P.95 of spec for details */
98
99 struct i3200_priv {
100         void __iomem *window;
101 };
102
103 static int nr_channels;
104
105 static int how_many_channels(struct pci_dev *pdev)
106 {
107         int n_channels;
108
109         unsigned char capid0_8b; /* 8th byte of CAPID0 */
110
111         pci_read_config_byte(pdev, I3200_CAPID0 + 8, &capid0_8b);
112
113         if (capid0_8b & 0x20) { /* check DCD: Dual Channel Disable */
114                 edac_dbg(0, "In single channel mode\n");
115                 n_channels = 1;
116         } else {
117                 edac_dbg(0, "In dual channel mode\n");
118                 n_channels = 2;
119         }
120
121         if (capid0_8b & 0x10) /* check if both channels are filled */
122                 edac_dbg(0, "2 DIMMS per channel disabled\n");
123         else
124                 edac_dbg(0, "2 DIMMS per channel enabled\n");
125
126         return n_channels;
127 }
128
129 static unsigned long eccerrlog_syndrome(u64 log)
130 {
131         return (log & I3200_ECCERRLOG_SYNDROME_BITS) >>
132                 I3200_ECCERRLOG_SYNDROME_SHIFT;
133 }
134
135 static int eccerrlog_row(int channel, u64 log)
136 {
137         u64 rank = ((log & I3200_ECCERRLOG_RANK_BITS) >>
138                 I3200_ECCERRLOG_RANK_SHIFT);
139         return rank | (channel * I3200_RANKS_PER_CHANNEL);
140 }
141
142 enum i3200_chips {
143         I3200 = 0,
144 };
145
146 struct i3200_dev_info {
147         const char *ctl_name;
148 };
149
150 struct i3200_error_info {
151         u16 errsts;
152         u16 errsts2;
153         u64 eccerrlog[I3200_CHANNELS];
154 };
155
156 static const struct i3200_dev_info i3200_devs[] = {
157         [I3200] = {
158                 .ctl_name = "i3200"
159         },
160 };
161
162 static struct pci_dev *mci_pdev;
163 static int i3200_registered = 1;
164
165
166 static void i3200_clear_error_info(struct mem_ctl_info *mci)
167 {
168         struct pci_dev *pdev;
169
170         pdev = to_pci_dev(mci->pdev);
171
172         /*
173          * Clear any error bits.
174          * (Yes, we really clear bits by writing 1 to them.)
175          */
176         pci_write_bits16(pdev, I3200_ERRSTS, I3200_ERRSTS_BITS,
177                 I3200_ERRSTS_BITS);
178 }
179
180 static void i3200_get_and_clear_error_info(struct mem_ctl_info *mci,
181                 struct i3200_error_info *info)
182 {
183         struct pci_dev *pdev;
184         struct i3200_priv *priv = mci->pvt_info;
185         void __iomem *window = priv->window;
186
187         pdev = to_pci_dev(mci->pdev);
188
189         /*
190          * This is a mess because there is no atomic way to read all the
191          * registers at once and the registers can transition from CE being
192          * overwritten by UE.
193          */
194         pci_read_config_word(pdev, I3200_ERRSTS, &info->errsts);
195         if (!(info->errsts & I3200_ERRSTS_BITS))
196                 return;
197
198         info->eccerrlog[0] = readq(window + I3200_C0ECCERRLOG);
199         if (nr_channels == 2)
200                 info->eccerrlog[1] = readq(window + I3200_C1ECCERRLOG);
201
202         pci_read_config_word(pdev, I3200_ERRSTS, &info->errsts2);
203
204         /*
205          * If the error is the same for both reads then the first set
206          * of reads is valid.  If there is a change then there is a CE
207          * with no info and the second set of reads is valid and
208          * should be UE info.
209          */
210         if ((info->errsts ^ info->errsts2) & I3200_ERRSTS_BITS) {
211                 info->eccerrlog[0] = readq(window + I3200_C0ECCERRLOG);
212                 if (nr_channels == 2)
213                         info->eccerrlog[1] = readq(window + I3200_C1ECCERRLOG);
214         }
215
216         i3200_clear_error_info(mci);
217 }
218
219 static void i3200_process_error_info(struct mem_ctl_info *mci,
220                 struct i3200_error_info *info)
221 {
222         int channel;
223         u64 log;
224
225         if (!(info->errsts & I3200_ERRSTS_BITS))
226                 return;
227
228         if ((info->errsts ^ info->errsts2) & I3200_ERRSTS_BITS) {
229                 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 0, 0, 0,
230                                      -1, -1, -1, "UE overwrote CE", "");
231                 info->errsts = info->errsts2;
232         }
233
234         for (channel = 0; channel < nr_channels; channel++) {
235                 log = info->eccerrlog[channel];
236                 if (log & I3200_ECCERRLOG_UE) {
237                         edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
238                                              0, 0, 0,
239                                              eccerrlog_row(channel, log),
240                                              -1, -1,
241                                              "i3000 UE", "");
242                 } else if (log & I3200_ECCERRLOG_CE) {
243                         edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
244                                              0, 0, eccerrlog_syndrome(log),
245                                              eccerrlog_row(channel, log),
246                                              -1, -1,
247                                              "i3000 CE", "");
248                 }
249         }
250 }
251
252 static void i3200_check(struct mem_ctl_info *mci)
253 {
254         struct i3200_error_info info;
255
256         i3200_get_and_clear_error_info(mci, &info);
257         i3200_process_error_info(mci, &info);
258 }
259
260 static void __iomem *i3200_map_mchbar(struct pci_dev *pdev)
261 {
262         union {
263                 u64 mchbar;
264                 struct {
265                         u32 mchbar_low;
266                         u32 mchbar_high;
267                 };
268         } u;
269         void __iomem *window;
270
271         pci_read_config_dword(pdev, I3200_MCHBAR_LOW, &u.mchbar_low);
272         pci_read_config_dword(pdev, I3200_MCHBAR_HIGH, &u.mchbar_high);
273         u.mchbar &= I3200_MCHBAR_MASK;
274
275         if (u.mchbar != (resource_size_t)u.mchbar) {
276                 printk(KERN_ERR
277                         "i3200: mmio space beyond accessible range (0x%llx)\n",
278                         (unsigned long long)u.mchbar);
279                 return NULL;
280         }
281
282         window = ioremap(u.mchbar, I3200_MMR_WINDOW_SIZE);
283         if (!window)
284                 printk(KERN_ERR "i3200: cannot map mmio space at 0x%llx\n",
285                         (unsigned long long)u.mchbar);
286
287         return window;
288 }
289
290
291 static void i3200_get_drbs(void __iomem *window,
292         u16 drbs[I3200_CHANNELS][I3200_RANKS_PER_CHANNEL])
293 {
294         int i;
295
296         for (i = 0; i < I3200_RANKS_PER_CHANNEL; i++) {
297                 drbs[0][i] = readw(window + I3200_C0DRB + 2*i) & I3200_DRB_MASK;
298                 drbs[1][i] = readw(window + I3200_C1DRB + 2*i) & I3200_DRB_MASK;
299
300                 edac_dbg(0, "drb[0][%d] = %d, drb[1][%d] = %d\n", i, drbs[0][i], i, drbs[1][i]);
301         }
302 }
303
304 static bool i3200_is_stacked(struct pci_dev *pdev,
305         u16 drbs[I3200_CHANNELS][I3200_RANKS_PER_CHANNEL])
306 {
307         u16 tom;
308
309         pci_read_config_word(pdev, I3200_TOM, &tom);
310         tom &= I3200_TOM_MASK;
311
312         return drbs[I3200_CHANNELS - 1][I3200_RANKS_PER_CHANNEL - 1] == tom;
313 }
314
315 static unsigned long drb_to_nr_pages(
316         u16 drbs[I3200_CHANNELS][I3200_RANKS_PER_CHANNEL], bool stacked,
317         int channel, int rank)
318 {
319         int n;
320
321         n = drbs[channel][rank];
322         if (!n)
323                 return 0;
324
325         if (rank > 0)
326                 n -= drbs[channel][rank - 1];
327         if (stacked && (channel == 1) &&
328         drbs[channel][rank] == drbs[channel][I3200_RANKS_PER_CHANNEL - 1])
329                 n -= drbs[0][I3200_RANKS_PER_CHANNEL - 1];
330
331         n <<= (I3200_DRB_SHIFT - PAGE_SHIFT);
332         return n;
333 }
334
335 static int i3200_probe1(struct pci_dev *pdev, int dev_idx)
336 {
337         int rc;
338         int i, j;
339         struct mem_ctl_info *mci = NULL;
340         struct edac_mc_layer layers[2];
341         u16 drbs[I3200_CHANNELS][I3200_RANKS_PER_CHANNEL];
342         bool stacked;
343         void __iomem *window;
344         struct i3200_priv *priv;
345
346         edac_dbg(0, "MC:\n");
347
348         window = i3200_map_mchbar(pdev);
349         if (!window)
350                 return -ENODEV;
351
352         i3200_get_drbs(window, drbs);
353         nr_channels = how_many_channels(pdev);
354
355         layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
356         layers[0].size = I3200_DIMMS;
357         layers[0].is_virt_csrow = true;
358         layers[1].type = EDAC_MC_LAYER_CHANNEL;
359         layers[1].size = nr_channels;
360         layers[1].is_virt_csrow = false;
361         mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
362                             sizeof(struct i3200_priv));
363         if (!mci)
364                 return -ENOMEM;
365
366         edac_dbg(3, "MC: init mci\n");
367
368         mci->pdev = &pdev->dev;
369         mci->mtype_cap = MEM_FLAG_DDR2;
370
371         mci->edac_ctl_cap = EDAC_FLAG_SECDED;
372         mci->edac_cap = EDAC_FLAG_SECDED;
373
374         mci->mod_name = EDAC_MOD_STR;
375         mci->ctl_name = i3200_devs[dev_idx].ctl_name;
376         mci->dev_name = pci_name(pdev);
377         mci->edac_check = i3200_check;
378         mci->ctl_page_to_phys = NULL;
379         priv = mci->pvt_info;
380         priv->window = window;
381
382         stacked = i3200_is_stacked(pdev, drbs);
383
384         /*
385          * The dram rank boundary (DRB) reg values are boundary addresses
386          * for each DRAM rank with a granularity of 64MB.  DRB regs are
387          * cumulative; the last one will contain the total memory
388          * contained in all ranks.
389          */
390         for (i = 0; i < I3200_DIMMS; i++) {
391                 unsigned long nr_pages;
392
393                 for (j = 0; j < nr_channels; j++) {
394                         struct dimm_info *dimm = edac_get_dimm(mci, i, j, 0);
395
396                         nr_pages = drb_to_nr_pages(drbs, stacked, j, i);
397                         if (nr_pages == 0)
398                                 continue;
399
400                         edac_dbg(0, "csrow %d, channel %d%s, size = %ld MiB\n", i, j,
401                                  stacked ? " (stacked)" : "", PAGES_TO_MiB(nr_pages));
402
403                         dimm->nr_pages = nr_pages;
404                         dimm->grain = nr_pages << PAGE_SHIFT;
405                         dimm->mtype = MEM_DDR2;
406                         dimm->dtype = DEV_UNKNOWN;
407                         dimm->edac_mode = EDAC_UNKNOWN;
408                 }
409         }
410
411         i3200_clear_error_info(mci);
412
413         rc = -ENODEV;
414         if (edac_mc_add_mc(mci)) {
415                 edac_dbg(3, "MC: failed edac_mc_add_mc()\n");
416                 goto fail;
417         }
418
419         /* get this far and it's successful */
420         edac_dbg(3, "MC: success\n");
421         return 0;
422
423 fail:
424         iounmap(window);
425         if (mci)
426                 edac_mc_free(mci);
427
428         return rc;
429 }
430
431 static int i3200_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
432 {
433         int rc;
434
435         edac_dbg(0, "MC:\n");
436
437         if (pci_enable_device(pdev) < 0)
438                 return -EIO;
439
440         rc = i3200_probe1(pdev, ent->driver_data);
441         if (!mci_pdev)
442                 mci_pdev = pci_dev_get(pdev);
443
444         return rc;
445 }
446
447 static void i3200_remove_one(struct pci_dev *pdev)
448 {
449         struct mem_ctl_info *mci;
450         struct i3200_priv *priv;
451
452         edac_dbg(0, "\n");
453
454         mci = edac_mc_del_mc(&pdev->dev);
455         if (!mci)
456                 return;
457
458         priv = mci->pvt_info;
459         iounmap(priv->window);
460
461         edac_mc_free(mci);
462
463         pci_disable_device(pdev);
464 }
465
466 static const struct pci_device_id i3200_pci_tbl[] = {
467         {
468                 PCI_VEND_DEV(INTEL, 3200_HB), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
469                 I3200},
470         {
471                 0,
472         }            /* 0 terminated list. */
473 };
474
475 MODULE_DEVICE_TABLE(pci, i3200_pci_tbl);
476
477 static struct pci_driver i3200_driver = {
478         .name = EDAC_MOD_STR,
479         .probe = i3200_init_one,
480         .remove = i3200_remove_one,
481         .id_table = i3200_pci_tbl,
482 };
483
484 static int __init i3200_init(void)
485 {
486         int pci_rc;
487
488         edac_dbg(3, "MC:\n");
489
490         /* Ensure that the OPSTATE is set correctly for POLL or NMI */
491         opstate_init();
492
493         pci_rc = pci_register_driver(&i3200_driver);
494         if (pci_rc < 0)
495                 goto fail0;
496
497         if (!mci_pdev) {
498                 i3200_registered = 0;
499                 mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
500                                 PCI_DEVICE_ID_INTEL_3200_HB, NULL);
501                 if (!mci_pdev) {
502                         edac_dbg(0, "i3200 pci_get_device fail\n");
503                         pci_rc = -ENODEV;
504                         goto fail1;
505                 }
506
507                 pci_rc = i3200_init_one(mci_pdev, i3200_pci_tbl);
508                 if (pci_rc < 0) {
509                         edac_dbg(0, "i3200 init fail\n");
510                         pci_rc = -ENODEV;
511                         goto fail1;
512                 }
513         }
514
515         return 0;
516
517 fail1:
518         pci_unregister_driver(&i3200_driver);
519
520 fail0:
521         pci_dev_put(mci_pdev);
522
523         return pci_rc;
524 }
525
526 static void __exit i3200_exit(void)
527 {
528         edac_dbg(3, "MC:\n");
529
530         pci_unregister_driver(&i3200_driver);
531         if (!i3200_registered) {
532                 i3200_remove_one(mci_pdev);
533                 pci_dev_put(mci_pdev);
534         }
535 }
536
537 module_init(i3200_init);
538 module_exit(i3200_exit);
539
540 MODULE_LICENSE("GPL");
541 MODULE_AUTHOR("Akamai Technologies, Inc.");
542 MODULE_DESCRIPTION("MC support for Intel 3200 memory hub controllers");
543
544 module_param(edac_op_state, int, 0444);
545 MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");