edac: move dimm properties to struct dimm_info
[pandora-kernel.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_core.h"
17
18 #include <asm-generic/io-64-nonatomic-lo-hi.h>
19
20 #define I3200_REVISION        "1.1"
21
22 #define EDAC_MOD_STR        "i3200_edac"
23
24 #define PCI_DEVICE_ID_INTEL_3200_HB    0x29f0
25
26 #define I3200_RANKS             8
27 #define I3200_RANKS_PER_CHANNEL 4
28 #define I3200_CHANNELS          2
29
30 /* Intel 3200 register addresses - device 0 function 0 - DRAM Controller */
31
32 #define I3200_MCHBAR_LOW        0x48    /* MCH Memory Mapped Register BAR */
33 #define I3200_MCHBAR_HIGH       0x4c
34 #define I3200_MCHBAR_MASK       0xfffffc000ULL  /* bits 35:14 */
35 #define I3200_MMR_WINDOW_SIZE   16384
36
37 #define I3200_TOM               0xa0    /* Top of Memory (16b)
38                  *
39                  * 15:10 reserved
40                  *  9:0  total populated physical memory
41                  */
42 #define I3200_TOM_MASK          0x3ff   /* bits 9:0 */
43 #define I3200_TOM_SHIFT         26      /* 64MiB grain */
44
45 #define I3200_ERRSTS            0xc8    /* Error Status Register (16b)
46                  *
47                  * 15    reserved
48                  * 14    Isochronous TBWRR Run Behind FIFO Full
49                  *       (ITCV)
50                  * 13    Isochronous TBWRR Run Behind FIFO Put
51                  *       (ITSTV)
52                  * 12    reserved
53                  * 11    MCH Thermal Sensor Event
54                  *       for SMI/SCI/SERR (GTSE)
55                  * 10    reserved
56                  *  9    LOCK to non-DRAM Memory Flag (LCKF)
57                  *  8    reserved
58                  *  7    DRAM Throttle Flag (DTF)
59                  *  6:2  reserved
60                  *  1    Multi-bit DRAM ECC Error Flag (DMERR)
61                  *  0    Single-bit DRAM ECC Error Flag (DSERR)
62                  */
63 #define I3200_ERRSTS_UE         0x0002
64 #define I3200_ERRSTS_CE         0x0001
65 #define I3200_ERRSTS_BITS       (I3200_ERRSTS_UE | I3200_ERRSTS_CE)
66
67
68 /* Intel  MMIO register space - device 0 function 0 - MMR space */
69
70 #define I3200_C0DRB     0x200   /* Channel 0 DRAM Rank Boundary (16b x 4)
71                  *
72                  * 15:10 reserved
73                  *  9:0  Channel 0 DRAM Rank Boundary Address
74                  */
75 #define I3200_C1DRB     0x600   /* Channel 1 DRAM Rank Boundary (16b x 4) */
76 #define I3200_DRB_MASK  0x3ff   /* bits 9:0 */
77 #define I3200_DRB_SHIFT 26      /* 64MiB grain */
78
79 #define I3200_C0ECCERRLOG       0x280   /* Channel 0 ECC Error Log (64b)
80                  *
81                  * 63:48 Error Column Address (ERRCOL)
82                  * 47:32 Error Row Address (ERRROW)
83                  * 31:29 Error Bank Address (ERRBANK)
84                  * 28:27 Error Rank Address (ERRRANK)
85                  * 26:24 reserved
86                  * 23:16 Error Syndrome (ERRSYND)
87                  * 15: 2 reserved
88                  *    1  Multiple Bit Error Status (MERRSTS)
89                  *    0  Correctable Error Status (CERRSTS)
90                  */
91 #define I3200_C1ECCERRLOG               0x680   /* Chan 1 ECC Error Log (64b) */
92 #define I3200_ECCERRLOG_CE              0x1
93 #define I3200_ECCERRLOG_UE              0x2
94 #define I3200_ECCERRLOG_RANK_BITS       0x18000000
95 #define I3200_ECCERRLOG_RANK_SHIFT      27
96 #define I3200_ECCERRLOG_SYNDROME_BITS   0xff0000
97 #define I3200_ECCERRLOG_SYNDROME_SHIFT  16
98 #define I3200_CAPID0                    0xe0    /* P.95 of spec for details */
99
100 struct i3200_priv {
101         void __iomem *window;
102 };
103
104 static int nr_channels;
105
106 static int how_many_channels(struct pci_dev *pdev)
107 {
108         unsigned char capid0_8b; /* 8th byte of CAPID0 */
109
110         pci_read_config_byte(pdev, I3200_CAPID0 + 8, &capid0_8b);
111         if (capid0_8b & 0x20) { /* check DCD: Dual Channel Disable */
112                 debugf0("In single channel mode.\n");
113                 return 1;
114         } else {
115                 debugf0("In dual channel mode.\n");
116                 return 2;
117         }
118 }
119
120 static unsigned long eccerrlog_syndrome(u64 log)
121 {
122         return (log & I3200_ECCERRLOG_SYNDROME_BITS) >>
123                 I3200_ECCERRLOG_SYNDROME_SHIFT;
124 }
125
126 static int eccerrlog_row(int channel, u64 log)
127 {
128         u64 rank = ((log & I3200_ECCERRLOG_RANK_BITS) >>
129                 I3200_ECCERRLOG_RANK_SHIFT);
130         return rank | (channel * I3200_RANKS_PER_CHANNEL);
131 }
132
133 enum i3200_chips {
134         I3200 = 0,
135 };
136
137 struct i3200_dev_info {
138         const char *ctl_name;
139 };
140
141 struct i3200_error_info {
142         u16 errsts;
143         u16 errsts2;
144         u64 eccerrlog[I3200_CHANNELS];
145 };
146
147 static const struct i3200_dev_info i3200_devs[] = {
148         [I3200] = {
149                 .ctl_name = "i3200"
150         },
151 };
152
153 static struct pci_dev *mci_pdev;
154 static int i3200_registered = 1;
155
156
157 static void i3200_clear_error_info(struct mem_ctl_info *mci)
158 {
159         struct pci_dev *pdev;
160
161         pdev = to_pci_dev(mci->dev);
162
163         /*
164          * Clear any error bits.
165          * (Yes, we really clear bits by writing 1 to them.)
166          */
167         pci_write_bits16(pdev, I3200_ERRSTS, I3200_ERRSTS_BITS,
168                 I3200_ERRSTS_BITS);
169 }
170
171 static void i3200_get_and_clear_error_info(struct mem_ctl_info *mci,
172                 struct i3200_error_info *info)
173 {
174         struct pci_dev *pdev;
175         struct i3200_priv *priv = mci->pvt_info;
176         void __iomem *window = priv->window;
177
178         pdev = to_pci_dev(mci->dev);
179
180         /*
181          * This is a mess because there is no atomic way to read all the
182          * registers at once and the registers can transition from CE being
183          * overwritten by UE.
184          */
185         pci_read_config_word(pdev, I3200_ERRSTS, &info->errsts);
186         if (!(info->errsts & I3200_ERRSTS_BITS))
187                 return;
188
189         info->eccerrlog[0] = readq(window + I3200_C0ECCERRLOG);
190         if (nr_channels == 2)
191                 info->eccerrlog[1] = readq(window + I3200_C1ECCERRLOG);
192
193         pci_read_config_word(pdev, I3200_ERRSTS, &info->errsts2);
194
195         /*
196          * If the error is the same for both reads then the first set
197          * of reads is valid.  If there is a change then there is a CE
198          * with no info and the second set of reads is valid and
199          * should be UE info.
200          */
201         if ((info->errsts ^ info->errsts2) & I3200_ERRSTS_BITS) {
202                 info->eccerrlog[0] = readq(window + I3200_C0ECCERRLOG);
203                 if (nr_channels == 2)
204                         info->eccerrlog[1] = readq(window + I3200_C1ECCERRLOG);
205         }
206
207         i3200_clear_error_info(mci);
208 }
209
210 static void i3200_process_error_info(struct mem_ctl_info *mci,
211                 struct i3200_error_info *info)
212 {
213         int channel;
214         u64 log;
215
216         if (!(info->errsts & I3200_ERRSTS_BITS))
217                 return;
218
219         if ((info->errsts ^ info->errsts2) & I3200_ERRSTS_BITS) {
220                 edac_mc_handle_ce_no_info(mci, "UE overwrote CE");
221                 info->errsts = info->errsts2;
222         }
223
224         for (channel = 0; channel < nr_channels; channel++) {
225                 log = info->eccerrlog[channel];
226                 if (log & I3200_ECCERRLOG_UE) {
227                         edac_mc_handle_ue(mci, 0, 0,
228                                 eccerrlog_row(channel, log),
229                                 "i3200 UE");
230                 } else if (log & I3200_ECCERRLOG_CE) {
231                         edac_mc_handle_ce(mci, 0, 0,
232                                 eccerrlog_syndrome(log),
233                                 eccerrlog_row(channel, log), 0,
234                                 "i3200 CE");
235                 }
236         }
237 }
238
239 static void i3200_check(struct mem_ctl_info *mci)
240 {
241         struct i3200_error_info info;
242
243         debugf1("MC%d: %s()\n", mci->mc_idx, __func__);
244         i3200_get_and_clear_error_info(mci, &info);
245         i3200_process_error_info(mci, &info);
246 }
247
248
249 void __iomem *i3200_map_mchbar(struct pci_dev *pdev)
250 {
251         union {
252                 u64 mchbar;
253                 struct {
254                         u32 mchbar_low;
255                         u32 mchbar_high;
256                 };
257         } u;
258         void __iomem *window;
259
260         pci_read_config_dword(pdev, I3200_MCHBAR_LOW, &u.mchbar_low);
261         pci_read_config_dword(pdev, I3200_MCHBAR_HIGH, &u.mchbar_high);
262         u.mchbar &= I3200_MCHBAR_MASK;
263
264         if (u.mchbar != (resource_size_t)u.mchbar) {
265                 printk(KERN_ERR
266                         "i3200: mmio space beyond accessible range (0x%llx)\n",
267                         (unsigned long long)u.mchbar);
268                 return NULL;
269         }
270
271         window = ioremap_nocache(u.mchbar, I3200_MMR_WINDOW_SIZE);
272         if (!window)
273                 printk(KERN_ERR "i3200: cannot map mmio space at 0x%llx\n",
274                         (unsigned long long)u.mchbar);
275
276         return window;
277 }
278
279
280 static void i3200_get_drbs(void __iomem *window,
281         u16 drbs[I3200_CHANNELS][I3200_RANKS_PER_CHANNEL])
282 {
283         int i;
284
285         for (i = 0; i < I3200_RANKS_PER_CHANNEL; i++) {
286                 drbs[0][i] = readw(window + I3200_C0DRB + 2*i) & I3200_DRB_MASK;
287                 drbs[1][i] = readw(window + I3200_C1DRB + 2*i) & I3200_DRB_MASK;
288         }
289 }
290
291 static bool i3200_is_stacked(struct pci_dev *pdev,
292         u16 drbs[I3200_CHANNELS][I3200_RANKS_PER_CHANNEL])
293 {
294         u16 tom;
295
296         pci_read_config_word(pdev, I3200_TOM, &tom);
297         tom &= I3200_TOM_MASK;
298
299         return drbs[I3200_CHANNELS - 1][I3200_RANKS_PER_CHANNEL - 1] == tom;
300 }
301
302 static unsigned long drb_to_nr_pages(
303         u16 drbs[I3200_CHANNELS][I3200_RANKS_PER_CHANNEL], bool stacked,
304         int channel, int rank)
305 {
306         int n;
307
308         n = drbs[channel][rank];
309         if (rank > 0)
310                 n -= drbs[channel][rank - 1];
311         if (stacked && (channel == 1) &&
312         drbs[channel][rank] == drbs[channel][I3200_RANKS_PER_CHANNEL - 1])
313                 n -= drbs[0][I3200_RANKS_PER_CHANNEL - 1];
314
315         n <<= (I3200_DRB_SHIFT - PAGE_SHIFT);
316         return n;
317 }
318
319 static int i3200_probe1(struct pci_dev *pdev, int dev_idx)
320 {
321         int rc;
322         int i, j;
323         struct mem_ctl_info *mci = NULL;
324         unsigned long last_page;
325         u16 drbs[I3200_CHANNELS][I3200_RANKS_PER_CHANNEL];
326         bool stacked;
327         void __iomem *window;
328         struct i3200_priv *priv;
329
330         debugf0("MC: %s()\n", __func__);
331
332         window = i3200_map_mchbar(pdev);
333         if (!window)
334                 return -ENODEV;
335
336         i3200_get_drbs(window, drbs);
337         nr_channels = how_many_channels(pdev);
338
339         mci = edac_mc_alloc(sizeof(struct i3200_priv), I3200_RANKS,
340                 nr_channels, 0);
341         if (!mci)
342                 return -ENOMEM;
343
344         debugf3("MC: %s(): init mci\n", __func__);
345
346         mci->dev = &pdev->dev;
347         mci->mtype_cap = MEM_FLAG_DDR2;
348
349         mci->edac_ctl_cap = EDAC_FLAG_SECDED;
350         mci->edac_cap = EDAC_FLAG_SECDED;
351
352         mci->mod_name = EDAC_MOD_STR;
353         mci->mod_ver = I3200_REVISION;
354         mci->ctl_name = i3200_devs[dev_idx].ctl_name;
355         mci->dev_name = pci_name(pdev);
356         mci->edac_check = i3200_check;
357         mci->ctl_page_to_phys = NULL;
358         priv = mci->pvt_info;
359         priv->window = window;
360
361         stacked = i3200_is_stacked(pdev, drbs);
362
363         /*
364          * The dram rank boundary (DRB) reg values are boundary addresses
365          * for each DRAM rank with a granularity of 64MB.  DRB regs are
366          * cumulative; the last one will contain the total memory
367          * contained in all ranks.
368          */
369         last_page = -1UL;
370         for (i = 0; i < mci->nr_csrows; i++) {
371                 unsigned long nr_pages;
372                 struct csrow_info *csrow = &mci->csrows[i];
373
374                 nr_pages = drb_to_nr_pages(drbs, stacked,
375                         i / I3200_RANKS_PER_CHANNEL,
376                         i % I3200_RANKS_PER_CHANNEL);
377
378                 if (nr_pages == 0)
379                         continue;
380
381                 csrow->first_page = last_page + 1;
382                 last_page += nr_pages;
383                 csrow->last_page = last_page;
384                 csrow->nr_pages = nr_pages;
385
386                 for (j = 0; j < nr_channels; j++) {
387                         struct dimm_info *dimm = csrow->channels[j].dimm;
388
389                         dimm->grain = nr_pages << PAGE_SHIFT;
390                         dimm->mtype = MEM_DDR2;
391                         dimm->dtype = DEV_UNKNOWN;
392                         dimm->edac_mode = EDAC_UNKNOWN;
393                 }
394         }
395
396         i3200_clear_error_info(mci);
397
398         rc = -ENODEV;
399         if (edac_mc_add_mc(mci)) {
400                 debugf3("MC: %s(): failed edac_mc_add_mc()\n", __func__);
401                 goto fail;
402         }
403
404         /* get this far and it's successful */
405         debugf3("MC: %s(): success\n", __func__);
406         return 0;
407
408 fail:
409         iounmap(window);
410         if (mci)
411                 edac_mc_free(mci);
412
413         return rc;
414 }
415
416 static int __devinit i3200_init_one(struct pci_dev *pdev,
417                 const struct pci_device_id *ent)
418 {
419         int rc;
420
421         debugf0("MC: %s()\n", __func__);
422
423         if (pci_enable_device(pdev) < 0)
424                 return -EIO;
425
426         rc = i3200_probe1(pdev, ent->driver_data);
427         if (!mci_pdev)
428                 mci_pdev = pci_dev_get(pdev);
429
430         return rc;
431 }
432
433 static void __devexit i3200_remove_one(struct pci_dev *pdev)
434 {
435         struct mem_ctl_info *mci;
436         struct i3200_priv *priv;
437
438         debugf0("%s()\n", __func__);
439
440         mci = edac_mc_del_mc(&pdev->dev);
441         if (!mci)
442                 return;
443
444         priv = mci->pvt_info;
445         iounmap(priv->window);
446
447         edac_mc_free(mci);
448 }
449
450 static DEFINE_PCI_DEVICE_TABLE(i3200_pci_tbl) = {
451         {
452                 PCI_VEND_DEV(INTEL, 3200_HB), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
453                 I3200},
454         {
455                 0,
456         }            /* 0 terminated list. */
457 };
458
459 MODULE_DEVICE_TABLE(pci, i3200_pci_tbl);
460
461 static struct pci_driver i3200_driver = {
462         .name = EDAC_MOD_STR,
463         .probe = i3200_init_one,
464         .remove = __devexit_p(i3200_remove_one),
465         .id_table = i3200_pci_tbl,
466 };
467
468 static int __init i3200_init(void)
469 {
470         int pci_rc;
471
472         debugf3("MC: %s()\n", __func__);
473
474         /* Ensure that the OPSTATE is set correctly for POLL or NMI */
475         opstate_init();
476
477         pci_rc = pci_register_driver(&i3200_driver);
478         if (pci_rc < 0)
479                 goto fail0;
480
481         if (!mci_pdev) {
482                 i3200_registered = 0;
483                 mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
484                                 PCI_DEVICE_ID_INTEL_3200_HB, NULL);
485                 if (!mci_pdev) {
486                         debugf0("i3200 pci_get_device fail\n");
487                         pci_rc = -ENODEV;
488                         goto fail1;
489                 }
490
491                 pci_rc = i3200_init_one(mci_pdev, i3200_pci_tbl);
492                 if (pci_rc < 0) {
493                         debugf0("i3200 init fail\n");
494                         pci_rc = -ENODEV;
495                         goto fail1;
496                 }
497         }
498
499         return 0;
500
501 fail1:
502         pci_unregister_driver(&i3200_driver);
503
504 fail0:
505         if (mci_pdev)
506                 pci_dev_put(mci_pdev);
507
508         return pci_rc;
509 }
510
511 static void __exit i3200_exit(void)
512 {
513         debugf3("MC: %s()\n", __func__);
514
515         pci_unregister_driver(&i3200_driver);
516         if (!i3200_registered) {
517                 i3200_remove_one(mci_pdev);
518                 pci_dev_put(mci_pdev);
519         }
520 }
521
522 module_init(i3200_init);
523 module_exit(i3200_exit);
524
525 MODULE_LICENSE("GPL");
526 MODULE_AUTHOR("Akamai Technologies, Inc.");
527 MODULE_DESCRIPTION("MC support for Intel 3200 memory hub controllers");
528
529 module_param(edac_op_state, int, 0444);
530 MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");