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[linux.git] / drivers / edac / cpc925_edac.c
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2a9036af
HC		 1/*
2 * cpc925_edac.c, EDAC driver for IBM CPC925 Bridge and Memory Controller.
3 *
4 * Copyright (c) 2008 Wind River Systems, Inc.
5 *
6 * Authors: Cao Qingtao <[email protected]>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
15 * See the GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22#include <linux/module.h>
23#include <linux/init.h>
24#include <linux/io.h>
25#include <linux/edac.h>
26#include <linux/of.h>
27#include <linux/platform_device.h>
28
29#include "edac_core.h"
30#include "edac_module.h"
31
32#define CPC925_EDAC_REVISION " Ver: 1.0.0 " __DATE__
33#define CPC925_EDAC_MOD_STR "cpc925_edac"
34
35#define cpc925_printk(level, fmt, arg...) \
36 edac_printk(level, "CPC925", fmt, ##arg)
37
38#define cpc925_mc_printk(mci, level, fmt, arg...) \
39 edac_mc_chipset_printk(mci, level, "CPC925", fmt, ##arg)
40
41/*
42 * CPC925 registers are of 32 bits with bit0 defined at the
43 * most significant bit and bit31 at that of least significant.
44 */
45#define CPC925_BITS_PER_REG 32
46#define CPC925_BIT(nr) (1UL << (CPC925_BITS_PER_REG - 1 - nr))
47
48/*
49 * EDAC device names for the error detections of
50 * CPU Interface and Hypertransport Link.
51 */
52#define CPC925_CPU_ERR_DEV "cpu"
53#define CPC925_HT_LINK_DEV "htlink"
54
55/* Suppose DDR Refresh cycle is 15.6 microsecond */
56#define CPC925_REF_FREQ 0xFA69
57#define CPC925_SCRUB_BLOCK_SIZE 64 /* bytes */
58#define CPC925_NR_CSROWS 8
59
60/*
61 * All registers and bits definitions are taken from
62 * "CPC925 Bridge and Memory Controller User Manual, SA14-2761-02".
63 */
64
65/*
66 * CPU and Memory Controller Registers
67 */
68/************************************************************
69 * Processor Interface Exception Mask Register (APIMASK)
70 ************************************************************/
71#define REG_APIMASK_OFFSET 0x30070
72enum apimask_bits {
73 APIMASK_DART = CPC925_BIT(0), /* DART Exception */
74 APIMASK_ADI0 = CPC925_BIT(1), /* Handshake Error on PI0_ADI */
75 APIMASK_ADI1 = CPC925_BIT(2), /* Handshake Error on PI1_ADI */
76 APIMASK_STAT = CPC925_BIT(3), /* Status Exception */
77 APIMASK_DERR = CPC925_BIT(4), /* Data Error Exception */
78 APIMASK_ADRS0 = CPC925_BIT(5), /* Addressing Exception on PI0 */
79 APIMASK_ADRS1 = CPC925_BIT(6), /* Addressing Exception on PI1 */
80 /* BIT(7) Reserved */
81 APIMASK_ECC_UE_H = CPC925_BIT(8), /* UECC upper */
82 APIMASK_ECC_CE_H = CPC925_BIT(9), /* CECC upper */
83 APIMASK_ECC_UE_L = CPC925_BIT(10), /* UECC lower */
84 APIMASK_ECC_CE_L = CPC925_BIT(11), /* CECC lower */
85
86 CPU_MASK_ENABLE = (APIMASK_DART | APIMASK_ADI0 | APIMASK_ADI1 |
87 APIMASK_STAT | APIMASK_DERR | APIMASK_ADRS0 |
88 APIMASK_ADRS1),
89 ECC_MASK_ENABLE = (APIMASK_ECC_UE_H | APIMASK_ECC_CE_H |
90 APIMASK_ECC_UE_L | APIMASK_ECC_CE_L),
91};
92
93/************************************************************
94 * Processor Interface Exception Register (APIEXCP)
95 ************************************************************/
96#define REG_APIEXCP_OFFSET 0x30060
97enum apiexcp_bits {
98 APIEXCP_DART = CPC925_BIT(0), /* DART Exception */
99 APIEXCP_ADI0 = CPC925_BIT(1), /* Handshake Error on PI0_ADI */
100 APIEXCP_ADI1 = CPC925_BIT(2), /* Handshake Error on PI1_ADI */
101 APIEXCP_STAT = CPC925_BIT(3), /* Status Exception */
102 APIEXCP_DERR = CPC925_BIT(4), /* Data Error Exception */
103 APIEXCP_ADRS0 = CPC925_BIT(5), /* Addressing Exception on PI0 */
104 APIEXCP_ADRS1 = CPC925_BIT(6), /* Addressing Exception on PI1 */
105 /* BIT(7) Reserved */
106 APIEXCP_ECC_UE_H = CPC925_BIT(8), /* UECC upper */
107 APIEXCP_ECC_CE_H = CPC925_BIT(9), /* CECC upper */
108 APIEXCP_ECC_UE_L = CPC925_BIT(10), /* UECC lower */
109 APIEXCP_ECC_CE_L = CPC925_BIT(11), /* CECC lower */
110
111 CPU_EXCP_DETECTED = (APIEXCP_DART | APIEXCP_ADI0 | APIEXCP_ADI1 |
112 APIEXCP_STAT | APIEXCP_DERR | APIEXCP_ADRS0 |
113 APIEXCP_ADRS1),
114 UECC_EXCP_DETECTED = (APIEXCP_ECC_UE_H | APIEXCP_ECC_UE_L),
115 CECC_EXCP_DETECTED = (APIEXCP_ECC_CE_H | APIEXCP_ECC_CE_L),
116 ECC_EXCP_DETECTED = (UECC_EXCP_DETECTED | CECC_EXCP_DETECTED),
117};
118
119/************************************************************
120 * Memory Bus Configuration Register (MBCR)
121************************************************************/
122#define REG_MBCR_OFFSET 0x2190
123#define MBCR_64BITCFG_SHIFT 23
124#define MBCR_64BITCFG_MASK (1UL << MBCR_64BITCFG_SHIFT)
125#define MBCR_64BITBUS_SHIFT 22
126#define MBCR_64BITBUS_MASK (1UL << MBCR_64BITBUS_SHIFT)
127
128/************************************************************
129 * Memory Bank Mode Register (MBMR)
130************************************************************/
131#define REG_MBMR_OFFSET 0x21C0
132#define MBMR_MODE_MAX_VALUE 0xF
133#define MBMR_MODE_SHIFT 25
134#define MBMR_MODE_MASK (MBMR_MODE_MAX_VALUE << MBMR_MODE_SHIFT)
135#define MBMR_BBA_SHIFT 24
136#define MBMR_BBA_MASK (1UL << MBMR_BBA_SHIFT)
137
138/************************************************************
139 * Memory Bank Boundary Address Register (MBBAR)
140 ************************************************************/
141#define REG_MBBAR_OFFSET 0x21D0
142#define MBBAR_BBA_MAX_VALUE 0xFF
143#define MBBAR_BBA_SHIFT 24
144#define MBBAR_BBA_MASK (MBBAR_BBA_MAX_VALUE << MBBAR_BBA_SHIFT)
145
146/************************************************************
147 * Memory Scrub Control Register (MSCR)
148 ************************************************************/
149#define REG_MSCR_OFFSET 0x2400
150#define MSCR_SCRUB_MOD_MASK 0xC0000000 /* scrub_mod - bit0:1*/
151#define MSCR_BACKGR_SCRUB 0x40000000 /* 01 */
152#define MSCR_SI_SHIFT 16 /* si - bit8:15*/
153#define MSCR_SI_MAX_VALUE 0xFF
154#define MSCR_SI_MASK (MSCR_SI_MAX_VALUE << MSCR_SI_SHIFT)
155
156/************************************************************
157 * Memory Scrub Range Start Register (MSRSR)
158 ************************************************************/
159#define REG_MSRSR_OFFSET 0x2410
160
161/************************************************************
162 * Memory Scrub Range End Register (MSRER)
163 ************************************************************/
164#define REG_MSRER_OFFSET 0x2420
165
166/************************************************************
167 * Memory Scrub Pattern Register (MSPR)
168 ************************************************************/
169#define REG_MSPR_OFFSET 0x2430
170
171/************************************************************
172 * Memory Check Control Register (MCCR)
173 ************************************************************/
174#define REG_MCCR_OFFSET 0x2440
175enum mccr_bits {
176 MCCR_ECC_EN = CPC925_BIT(0), /* ECC high and low check */
177};
178
179/************************************************************
180 * Memory Check Range End Register (MCRER)
181 ************************************************************/
182#define REG_MCRER_OFFSET 0x2450
183
184/************************************************************
185 * Memory Error Address Register (MEAR)
186 ************************************************************/
187#define REG_MEAR_OFFSET 0x2460
188#define MEAR_BCNT_MAX_VALUE 0x3
189#define MEAR_BCNT_SHIFT 30
190#define MEAR_BCNT_MASK (MEAR_BCNT_MAX_VALUE << MEAR_BCNT_SHIFT)
191#define MEAR_RANK_MAX_VALUE 0x7
192#define MEAR_RANK_SHIFT 27
193#define MEAR_RANK_MASK (MEAR_RANK_MAX_VALUE << MEAR_RANK_SHIFT)
194#define MEAR_COL_MAX_VALUE 0x7FF
195#define MEAR_COL_SHIFT 16
196#define MEAR_COL_MASK (MEAR_COL_MAX_VALUE << MEAR_COL_SHIFT)
197#define MEAR_BANK_MAX_VALUE 0x3
198#define MEAR_BANK_SHIFT 14
199#define MEAR_BANK_MASK (MEAR_BANK_MAX_VALUE << MEAR_BANK_SHIFT)
200#define MEAR_ROW_MASK 0x00003FFF
201
202/************************************************************
203 * Memory Error Syndrome Register (MESR)
204 ************************************************************/
205#define REG_MESR_OFFSET 0x2470
206#define MESR_ECC_SYN_H_MASK 0xFF00
207#define MESR_ECC_SYN_L_MASK 0x00FF
208
209/************************************************************
210 * Memory Mode Control Register (MMCR)
211 ************************************************************/
212#define REG_MMCR_OFFSET 0x2500
213enum mmcr_bits {
214 MMCR_REG_DIMM_MODE = CPC925_BIT(3),
215};
216
217/*
218 * HyperTransport Link Registers
219 */
220/************************************************************
221 * Error Handling/Enumeration Scratch Pad Register (ERRCTRL)
222 ************************************************************/
223#define REG_ERRCTRL_OFFSET 0x70140
224enum errctrl_bits { /* nonfatal interrupts for */
225 ERRCTRL_SERR_NF = CPC925_BIT(0), /* system error */
226 ERRCTRL_CRC_NF = CPC925_BIT(1), /* CRC error */
227 ERRCTRL_RSP_NF = CPC925_BIT(2), /* Response error */
228 ERRCTRL_EOC_NF = CPC925_BIT(3), /* End-Of-Chain error */
229 ERRCTRL_OVF_NF = CPC925_BIT(4), /* Overflow error */
230 ERRCTRL_PROT_NF = CPC925_BIT(5), /* Protocol error */
231
232 ERRCTRL_RSP_ERR = CPC925_BIT(6), /* Response error received */
233 ERRCTRL_CHN_FAL = CPC925_BIT(7), /* Sync flooding detected */
234
235 HT_ERRCTRL_ENABLE = (ERRCTRL_SERR_NF | ERRCTRL_CRC_NF |
236 ERRCTRL_RSP_NF | ERRCTRL_EOC_NF |
237 ERRCTRL_OVF_NF | ERRCTRL_PROT_NF),
238 HT_ERRCTRL_DETECTED = (ERRCTRL_RSP_ERR | ERRCTRL_CHN_FAL),
239};
240
241/************************************************************
242 * Link Configuration and Link Control Register (LINKCTRL)
243 ************************************************************/
244#define REG_LINKCTRL_OFFSET 0x70110
245enum linkctrl_bits {
246 LINKCTRL_CRC_ERR = (CPC925_BIT(22) | CPC925_BIT(23)),
247 LINKCTRL_LINK_FAIL = CPC925_BIT(27),
248
249 HT_LINKCTRL_DETECTED = (LINKCTRL_CRC_ERR | LINKCTRL_LINK_FAIL),
250};
251
252/************************************************************
253 * Link FreqCap/Error/Freq/Revision ID Register (LINKERR)
254 ************************************************************/
255#define REG_LINKERR_OFFSET 0x70120
256enum linkerr_bits {
257 LINKERR_EOC_ERR = CPC925_BIT(17), /* End-Of-Chain error */
258 LINKERR_OVF_ERR = CPC925_BIT(18), /* Receive Buffer Overflow */
259 LINKERR_PROT_ERR = CPC925_BIT(19), /* Protocol error */
260
261 HT_LINKERR_DETECTED = (LINKERR_EOC_ERR | LINKERR_OVF_ERR |
262 LINKERR_PROT_ERR),
263};
264
265/************************************************************
266 * Bridge Control Register (BRGCTRL)
267 ************************************************************/
268#define REG_BRGCTRL_OFFSET 0x70300
269enum brgctrl_bits {
270 BRGCTRL_DETSERR = CPC925_BIT(0), /* SERR on Secondary Bus */
271 BRGCTRL_SECBUSRESET = CPC925_BIT(9), /* Secondary Bus Reset */
272};
273
274/* Private structure for edac memory controller */
275struct cpc925_mc_pdata {
276 void __iomem *vbase;
277 unsigned long total_mem;
278 const char *name;
279 int edac_idx;
280};
281
282/* Private structure for common edac device */
283struct cpc925_dev_info {
284 void __iomem *vbase;
285 struct platform_device *pdev;
286 char *ctl_name;
287 int edac_idx;
288 struct edac_device_ctl_info *edac_dev;
289 void (*init)(struct cpc925_dev_info *dev_info);
290 void (*exit)(struct cpc925_dev_info *dev_info);
291 void (*check)(struct edac_device_ctl_info *edac_dev);
292};
293
294/* Get total memory size from Open Firmware DTB */
295static void get_total_mem(struct cpc925_mc_pdata *pdata)
296{
297 struct device_node *np = NULL;
298 const unsigned int *reg, *reg_end;
299 int len, sw, aw;
300 unsigned long start, size;
301
302 np = of_find_node_by_type(NULL, "memory");
303 if (!np)
304 return;
305
306 aw = of_n_addr_cells(np);
307 sw = of_n_size_cells(np);
308 reg = (const unsigned int *)of_get_property(np, "reg", &len);
309 reg_end = reg + len/4;
310
311 pdata->total_mem = 0;
312 do {
313 start = of_read_number(reg, aw);
314 reg += aw;
315 size = of_read_number(reg, sw);
316 reg += sw;
317 debugf1("%s: start 0x%lx, size 0x%lx\n", __func__,
318 start, size);
319 pdata->total_mem += size;
320 } while (reg < reg_end);
321
322 of_node_put(np);
323 debugf0("%s: total_mem 0x%lx\n", __func__, pdata->total_mem);
324}
325
326static void cpc925_init_csrows(struct mem_ctl_info *mci)
327{
328 struct cpc925_mc_pdata *pdata = mci->pvt_info;
329 struct csrow_info *csrow;
330 int index;
331 u32 mbmr, mbbar, bba;
332 unsigned long row_size, last_nr_pages = 0;
333
334 get_total_mem(pdata);
335
336 for (index = 0; index < mci->nr_csrows; index++) {
337 mbmr = __raw_readl(pdata->vbase + REG_MBMR_OFFSET +
338 0x20 * index);
339 mbbar = __raw_readl(pdata->vbase + REG_MBBAR_OFFSET +
340 0x20 + index);
341 bba = (((mbmr & MBMR_BBA_MASK) >> MBMR_BBA_SHIFT) << 8) |
342 ((mbbar & MBBAR_BBA_MASK) >> MBBAR_BBA_SHIFT);
343
344 if (bba == 0)
345 continue; /* not populated */
346
347 csrow = &mci->csrows[index];
348
349 row_size = bba * (1UL << 28); /* 256M */
350 csrow->first_page = last_nr_pages;
351 csrow->nr_pages = row_size >> PAGE_SHIFT;
352 csrow->last_page = csrow->first_page + csrow->nr_pages - 1;
353 last_nr_pages = csrow->last_page + 1;
354
355 csrow->mtype = MEM_RDDR;
356 csrow->edac_mode = EDAC_SECDED;
357
358 switch (csrow->nr_channels) {
359 case 1: /* Single channel */
360 csrow->grain = 32; /* four-beat burst of 32 bytes */
361 break;
362 case 2: /* Dual channel */
363 default:
364 csrow->grain = 64; /* four-beat burst of 64 bytes */
365 break;
366 }
367
368 switch ((mbmr & MBMR_MODE_MASK) >> MBMR_MODE_SHIFT) {
369 case 6: /* 0110, no way to differentiate X8 VS X16 */
370 case 5: /* 0101 */
371 case 8: /* 1000 */
372 csrow->dtype = DEV_X16;
373 break;
374 case 7: /* 0111 */
375 case 9: /* 1001 */
376 csrow->dtype = DEV_X8;
377 break;
378 default:
379 csrow->dtype = DEV_UNKNOWN;
380 break;
381 }
382 }
383}
384
385/* Enable memory controller ECC detection */
386static void cpc925_mc_init(struct mem_ctl_info *mci)
387{
388 struct cpc925_mc_pdata *pdata = mci->pvt_info;
389 u32 apimask;
390 u32 mccr;
391
392 /* Enable various ECC error exceptions */
393 apimask = __raw_readl(pdata->vbase + REG_APIMASK_OFFSET);
394 if ((apimask & ECC_MASK_ENABLE) == 0) {
395 apimask |= ECC_MASK_ENABLE;
396 __raw_writel(apimask, pdata->vbase + REG_APIMASK_OFFSET);
397 }
398
399 /* Enable ECC detection */
400 mccr = __raw_readl(pdata->vbase + REG_MCCR_OFFSET);
401 if ((mccr & MCCR_ECC_EN) == 0) {
402 mccr |= MCCR_ECC_EN;
403 __raw_writel(mccr, pdata->vbase + REG_MCCR_OFFSET);
404 }
405}
406
407/* Disable memory controller ECC detection */
408static void cpc925_mc_exit(struct mem_ctl_info *mci)
409{
410 /*
411 * WARNING:
412 * We are supposed to clear the ECC error detection bits,
413 * and it will be no problem to do so. However, once they
414 * are cleared here if we want to re-install CPC925 EDAC
415 * module later, setting them up in cpc925_mc_init() will
416 * trigger machine check exception.
417 * Also, it's ok to leave ECC error detection bits enabled,
418 * since they are reset to 1 by default or by boot loader.
419 */
420
421 return;
422}
423
424/*
425 * Revert DDR column/row/bank addresses into page frame number and
426 * offset in page.
427 *
428 * Suppose memory mode is 0x0111(128-bit mode, identical DIMM pairs),
429 * physical address(PA) bits to column address(CA) bits mappings are:
430 * CA 0 1 2 3 4 5 6 7 8 9 10
431 * PA 59 58 57 56 55 54 53 52 51 50 49
432 *
433 * physical address(PA) bits to bank address(BA) bits mappings are:
434 * BA 0 1
435 * PA 43 44
436 *
437 * physical address(PA) bits to row address(RA) bits mappings are:
438 * RA 0 1 2 3 4 5 6 7 8 9 10 11 12
439 * PA 36 35 34 48 47 46 45 40 41 42 39 38 37
440 */
441static void cpc925_mc_get_pfn(struct mem_ctl_info *mci, u32 mear,
442 unsigned long *pfn, unsigned long *offset, int *csrow)
443{
444 u32 bcnt, rank, col, bank, row;
445 u32 c;
446 unsigned long pa;
447 int i;
448
449 bcnt = (mear & MEAR_BCNT_MASK) >> MEAR_BCNT_SHIFT;
450 rank = (mear & MEAR_RANK_MASK) >> MEAR_RANK_SHIFT;
451 col = (mear & MEAR_COL_MASK) >> MEAR_COL_SHIFT;
452 bank = (mear & MEAR_BANK_MASK) >> MEAR_BANK_SHIFT;
453 row = mear & MEAR_ROW_MASK;
454
455 *csrow = rank;
456
457#ifdef CONFIG_EDAC_DEBUG
458 if (mci->csrows[rank].first_page == 0) {
459 cpc925_mc_printk(mci, KERN_ERR, "ECC occurs in a "
460 "non-populated csrow, broken hardware?\n");
461 return;
462 }
463#endif
464
465 /* Revert csrow number */
466 pa = mci->csrows[rank].first_page << PAGE_SHIFT;
467
468 /* Revert column address */
469 col += bcnt;
470 for (i = 0; i < 11; i++) {
471 c = col & 0x1;
472 col >>= 1;
473 pa |= c << (14 - i);
474 }
475
476 /* Revert bank address */
477 pa |= bank << 19;
478
479 /* Revert row address, in 4 steps */
480 for (i = 0; i < 3; i++) {
481 c = row & 0x1;
482 row >>= 1;
483 pa |= c << (26 - i);
484 }
485
486 for (i = 0; i < 3; i++) {
487 c = row & 0x1;
488 row >>= 1;
489 pa |= c << (21 + i);
490 }
491
492 for (i = 0; i < 4; i++) {
493 c = row & 0x1;
494 row >>= 1;
495 pa |= c << (18 - i);
496 }
497
498 for (i = 0; i < 3; i++) {
499 c = row & 0x1;
500 row >>= 1;
501 pa |= c << (29 - i);
502 }
503
504 *offset = pa & (PAGE_SIZE - 1);
505 *pfn = pa >> PAGE_SHIFT;
506
507 debugf0("%s: ECC physical address 0x%lx\n", __func__, pa);
508}
509
510static int cpc925_mc_find_channel(struct mem_ctl_info *mci, u16 syndrome)
511{
512 if ((syndrome & MESR_ECC_SYN_H_MASK) == 0)
513 return 0;
514
515 if ((syndrome & MESR_ECC_SYN_L_MASK) == 0)
516 return 1;
517
518 cpc925_mc_printk(mci, KERN_INFO, "Unexpected syndrome value: 0x%x\n",
519 syndrome);
520 return 1;
521}
522
523/* Check memory controller registers for ECC errors */
524static void cpc925_mc_check(struct mem_ctl_info *mci)
525{
526 struct cpc925_mc_pdata *pdata = mci->pvt_info;
527 u32 apiexcp;
528 u32 mear;
529 u32 mesr;
530 u16 syndrome;
531 unsigned long pfn = 0, offset = 0;
532 int csrow = 0, channel = 0;
533
534 /* APIEXCP is cleared when read */
535 apiexcp = __raw_readl(pdata->vbase + REG_APIEXCP_OFFSET);
536 if ((apiexcp & ECC_EXCP_DETECTED) == 0)
537 return;
538
539 mesr = __raw_readl(pdata->vbase + REG_MESR_OFFSET);
540 syndrome = mesr | (MESR_ECC_SYN_H_MASK | MESR_ECC_SYN_L_MASK);
541
542 mear = __raw_readl(pdata->vbase + REG_MEAR_OFFSET);
543
544 /* Revert column/row addresses into page frame number, etc */
545 cpc925_mc_get_pfn(mci, mear, &pfn, &offset, &csrow);
546
547 if (apiexcp & CECC_EXCP_DETECTED) {
548 cpc925_mc_printk(mci, KERN_INFO, "DRAM CECC Fault\n");
549 channel = cpc925_mc_find_channel(mci, syndrome);
550 edac_mc_handle_ce(mci, pfn, offset, syndrome,
551 csrow, channel, mci->ctl_name);
552 }
553
554 if (apiexcp & UECC_EXCP_DETECTED) {
555 cpc925_mc_printk(mci, KERN_INFO, "DRAM UECC Fault\n");
556 edac_mc_handle_ue(mci, pfn, offset, csrow, mci->ctl_name);
557 }
558
559 cpc925_mc_printk(mci, KERN_INFO, "Dump registers:\n");
560 cpc925_mc_printk(mci, KERN_INFO, "APIMASK 0x%08x\n",
561 __raw_readl(pdata->vbase + REG_APIMASK_OFFSET));
562 cpc925_mc_printk(mci, KERN_INFO, "APIEXCP 0x%08x\n",
563 apiexcp);
564 cpc925_mc_printk(mci, KERN_INFO, "Mem Scrub Ctrl 0x%08x\n",
565 __raw_readl(pdata->vbase + REG_MSCR_OFFSET));
566 cpc925_mc_printk(mci, KERN_INFO, "Mem Scrub Rge Start 0x%08x\n",
567 __raw_readl(pdata->vbase + REG_MSRSR_OFFSET));
568 cpc925_mc_printk(mci, KERN_INFO, "Mem Scrub Rge End 0x%08x\n",
569 __raw_readl(pdata->vbase + REG_MSRER_OFFSET));
570 cpc925_mc_printk(mci, KERN_INFO, "Mem Scrub Pattern 0x%08x\n",
571 __raw_readl(pdata->vbase + REG_MSPR_OFFSET));
572 cpc925_mc_printk(mci, KERN_INFO, "Mem Chk Ctrl 0x%08x\n",
573 __raw_readl(pdata->vbase + REG_MCCR_OFFSET));
574 cpc925_mc_printk(mci, KERN_INFO, "Mem Chk Rge End 0x%08x\n",
575 __raw_readl(pdata->vbase + REG_MCRER_OFFSET));
576 cpc925_mc_printk(mci, KERN_INFO, "Mem Err Address 0x%08x\n",
577 mesr);
578 cpc925_mc_printk(mci, KERN_INFO, "Mem Err Syndrome 0x%08x\n",
579 syndrome);
580}
581
582/******************** CPU err device********************************/
583/* Enable CPU Errors detection */
584static void cpc925_cpu_init(struct cpc925_dev_info *dev_info)
585{
586 u32 apimask;
587
588 apimask = __raw_readl(dev_info->vbase + REG_APIMASK_OFFSET);
589 if ((apimask & CPU_MASK_ENABLE) == 0) {
590 apimask |= CPU_MASK_ENABLE;
591 __raw_writel(apimask, dev_info->vbase + REG_APIMASK_OFFSET);
592 }
593}
594
595/* Disable CPU Errors detection */
596static void cpc925_cpu_exit(struct cpc925_dev_info *dev_info)
597{
598 /*
599 * WARNING:
600 * We are supposed to clear the CPU error detection bits,
601 * and it will be no problem to do so. However, once they
602 * are cleared here if we want to re-install CPC925 EDAC
603 * module later, setting them up in cpc925_cpu_init() will
604 * trigger machine check exception.
605 * Also, it's ok to leave CPU error detection bits enabled,
606 * since they are reset to 1 by default.
607 */
608
609 return;
610}
611
612/* Check for CPU Errors */
613static void cpc925_cpu_check(struct edac_device_ctl_info *edac_dev)
614{
615 struct cpc925_dev_info *dev_info = edac_dev->pvt_info;
616 u32 apiexcp;
617 u32 apimask;
618
619 /* APIEXCP is cleared when read */
620 apiexcp = __raw_readl(dev_info->vbase + REG_APIEXCP_OFFSET);
621 if ((apiexcp & CPU_EXCP_DETECTED) == 0)
622 return;
623
624 apimask = __raw_readl(dev_info->vbase + REG_APIMASK_OFFSET);
625 cpc925_printk(KERN_INFO, "Processor Interface Fault\n"
626 "Processor Interface register dump:\n");
627 cpc925_printk(KERN_INFO, "APIMASK 0x%08x\n", apimask);
628 cpc925_printk(KERN_INFO, "APIEXCP 0x%08x\n", apiexcp);
629
630 edac_device_handle_ue(edac_dev, 0, 0, edac_dev->ctl_name);
631}
632
633/******************** HT Link err device****************************/
634/* Enable HyperTransport Link Error detection */
635static void cpc925_htlink_init(struct cpc925_dev_info *dev_info)
636{
637 u32 ht_errctrl;
638
639 ht_errctrl = __raw_readl(dev_info->vbase + REG_ERRCTRL_OFFSET);
640 if ((ht_errctrl & HT_ERRCTRL_ENABLE) == 0) {
641 ht_errctrl |= HT_ERRCTRL_ENABLE;
642 __raw_writel(ht_errctrl, dev_info->vbase + REG_ERRCTRL_OFFSET);
643 }
644}
645
646/* Disable HyperTransport Link Error detection */
647static void cpc925_htlink_exit(struct cpc925_dev_info *dev_info)
648{
649 u32 ht_errctrl;
650
651 ht_errctrl = __raw_readl(dev_info->vbase + REG_ERRCTRL_OFFSET);
652 ht_errctrl &= ~HT_ERRCTRL_ENABLE;
653 __raw_writel(ht_errctrl, dev_info->vbase + REG_ERRCTRL_OFFSET);
654}
655
656/* Check for HyperTransport Link errors */
657static void cpc925_htlink_check(struct edac_device_ctl_info *edac_dev)
658{
659 struct cpc925_dev_info *dev_info = edac_dev->pvt_info;
660 u32 brgctrl = __raw_readl(dev_info->vbase + REG_BRGCTRL_OFFSET);
661 u32 linkctrl = __raw_readl(dev_info->vbase + REG_LINKCTRL_OFFSET);
662 u32 errctrl = __raw_readl(dev_info->vbase + REG_ERRCTRL_OFFSET);
663 u32 linkerr = __raw_readl(dev_info->vbase + REG_LINKERR_OFFSET);
664
665 if (!((brgctrl & BRGCTRL_DETSERR) ||
666 (linkctrl & HT_LINKCTRL_DETECTED) ||
667 (errctrl & HT_ERRCTRL_DETECTED) ||
668 (linkerr & HT_LINKERR_DETECTED)))
669 return;
670
671 cpc925_printk(KERN_INFO, "HT Link Fault\n"
672 "HT register dump:\n");
673 cpc925_printk(KERN_INFO, "Bridge Ctrl 0x%08x\n",
674 brgctrl);
675 cpc925_printk(KERN_INFO, "Link Config Ctrl 0x%08x\n",
676 linkctrl);
677 cpc925_printk(KERN_INFO, "Error Enum and Ctrl 0x%08x\n",
678 errctrl);
679 cpc925_printk(KERN_INFO, "Link Error 0x%08x\n",
680 linkerr);
681
682 /* Clear by write 1 */
683 if (brgctrl & BRGCTRL_DETSERR)
684 __raw_writel(BRGCTRL_DETSERR,
685 dev_info->vbase + REG_BRGCTRL_OFFSET);
686
687 if (linkctrl & HT_LINKCTRL_DETECTED)
688 __raw_writel(HT_LINKCTRL_DETECTED,
689 dev_info->vbase + REG_LINKCTRL_OFFSET);
690
691 /* Initiate Secondary Bus Reset to clear the chain failure */
692 if (errctrl & ERRCTRL_CHN_FAL)
693 __raw_writel(BRGCTRL_SECBUSRESET,
694 dev_info->vbase + REG_BRGCTRL_OFFSET);
695
696 if (errctrl & ERRCTRL_RSP_ERR)
697 __raw_writel(ERRCTRL_RSP_ERR,
698 dev_info->vbase + REG_ERRCTRL_OFFSET);
699
700 if (linkerr & HT_LINKERR_DETECTED)
701 __raw_writel(HT_LINKERR_DETECTED,
702 dev_info->vbase + REG_LINKERR_OFFSET);
703
704 edac_device_handle_ce(edac_dev, 0, 0, edac_dev->ctl_name);
705}
706
707static struct cpc925_dev_info cpc925_devs[] = {
708 {
709 .ctl_name = CPC925_CPU_ERR_DEV,
710 .init = cpc925_cpu_init,
711 .exit = cpc925_cpu_exit,
712 .check = cpc925_cpu_check,
713 },
714 {
715 .ctl_name = CPC925_HT_LINK_DEV,
716 .init = cpc925_htlink_init,
717 .exit = cpc925_htlink_exit,
718 .check = cpc925_htlink_check,
719 },
720 {0}, /* Terminated by NULL */
721};
722
723/*
724 * Add CPU Err detection and HyperTransport Link Err detection
725 * as common "edac_device", they have no corresponding device
726 * nodes in the Open Firmware DTB and we have to add platform
727 * devices for them. Also, they will share the MMIO with that
728 * of memory controller.
729 */
730static void cpc925_add_edac_devices(void __iomem *vbase)
731{
732 struct cpc925_dev_info *dev_info;
733
734 if (!vbase) {
735 cpc925_printk(KERN_ERR, "MMIO not established yet\n");
736 return;
737 }
738
739 for (dev_info = &cpc925_devs[0]; dev_info->init; dev_info++) {
740 dev_info->vbase = vbase;
741 dev_info->pdev = platform_device_register_simple(
742 dev_info->ctl_name, 0, NULL, 0);
743 if (IS_ERR(dev_info->pdev)) {
744 cpc925_printk(KERN_ERR,
745 "Can't register platform device for %s\n",
746 dev_info->ctl_name);
747 continue;
748 }
749
750 /*
751 * Don't have to allocate private structure but
752 * make use of cpc925_devs[] instead.
753 */
754 dev_info->edac_idx = edac_device_alloc_index();
755 dev_info->edac_dev =
756 edac_device_alloc_ctl_info(0, dev_info->ctl_name,
757 1, NULL, 0, 0, NULL, 0, dev_info->edac_idx);
758 if (!dev_info->edac_dev) {
759 cpc925_printk(KERN_ERR, "No memory for edac device\n");
760 goto err1;
761 }
762
763 dev_info->edac_dev->pvt_info = dev_info;
764 dev_info->edac_dev->dev = &dev_info->pdev->dev;
765 dev_info->edac_dev->ctl_name = dev_info->ctl_name;
766 dev_info->edac_dev->mod_name = CPC925_EDAC_MOD_STR;
767 dev_info->edac_dev->dev_name = dev_name(&dev_info->pdev->dev);
768
769 if (edac_op_state == EDAC_OPSTATE_POLL)
770 dev_info->edac_dev->edac_check = dev_info->check;
771
772 if (dev_info->init)
773 dev_info->init(dev_info);
774
775 if (edac_device_add_device(dev_info->edac_dev) > 0) {
776 cpc925_printk(KERN_ERR,
777 "Unable to add edac device for %s\n",
778 dev_info->ctl_name);
779 goto err2;
780 }
781
782 debugf0("%s: Successfully added edac device for %s\n",
783 __func__, dev_info->ctl_name);
784
785 continue;
786
787err2:
788 if (dev_info->exit)
789 dev_info->exit(dev_info);
790 edac_device_free_ctl_info(dev_info->edac_dev);
791err1:
792 platform_device_unregister(dev_info->pdev);
793 }
794}
795
796/*
797 * Delete the common "edac_device" for CPU Err Detection
798 * and HyperTransport Link Err Detection
799 */
800static void cpc925_del_edac_devices(void)
801{
802 struct cpc925_dev_info *dev_info;
803
804 for (dev_info = &cpc925_devs[0]; dev_info->init; dev_info++) {
805 if (dev_info->edac_dev) {
806 edac_device_del_device(dev_info->edac_dev->dev);
807 edac_device_free_ctl_info(dev_info->edac_dev);
808 platform_device_unregister(dev_info->pdev);
809 }
810
811 if (dev_info->exit)
812 dev_info->exit(dev_info);
813
814 debugf0("%s: Successfully deleted edac device for %s\n",
815 __func__, dev_info->ctl_name);
816 }
817}
818
819/* Convert current back-ground scrub rate into byte/sec bandwith */
820static int cpc925_get_sdram_scrub_rate(struct mem_ctl_info *mci, u32 *bw)
821{
822 struct cpc925_mc_pdata *pdata = mci->pvt_info;
823 u32 mscr;
824 u8 si;
825
826 mscr = __raw_readl(pdata->vbase + REG_MSCR_OFFSET);
827 si = (mscr & MSCR_SI_MASK) >> MSCR_SI_SHIFT;
828
829 debugf0("%s, Mem Scrub Ctrl Register 0x%x\n", __func__, mscr);
830
831 if (((mscr & MSCR_SCRUB_MOD_MASK) != MSCR_BACKGR_SCRUB) ||
832 (si == 0)) {
833 cpc925_mc_printk(mci, KERN_INFO, "Scrub mode not enabled\n");
834 *bw = 0;
835 } else
836 *bw = CPC925_SCRUB_BLOCK_SIZE * 0xFA67 / si;
837
838 return 0;
839}
840
841/* Return 0 for single channel; 1 for dual channel */
842static int cpc925_mc_get_channels(void __iomem *vbase)
843{
844 int dual = 0;
845 u32 mbcr;
846
847 mbcr = __raw_readl(vbase + REG_MBCR_OFFSET);
848
849 /*
850 * Dual channel only when 128-bit wide physical bus
851 * and 128-bit configuration.
852 */
853 if (((mbcr & MBCR_64BITCFG_MASK) == 0) &&
854 ((mbcr & MBCR_64BITBUS_MASK) == 0))
855 dual = 1;
856
857 debugf0("%s: %s channel\n", __func__,
858 (dual > 0) ? "Dual" : "Single");
859
860 return dual;
861}
862
863static int __devinit cpc925_probe(struct platform_device *pdev)
864{
865 static int edac_mc_idx;
866 struct mem_ctl_info *mci;
867 void __iomem *vbase;
868 struct cpc925_mc_pdata *pdata;
869 struct resource *r;
870 int res = 0, nr_channels;
871
872 debugf0("%s: %s platform device found!\n", __func__, pdev->name);
873
874 if (!devres_open_group(&pdev->dev, cpc925_probe, GFP_KERNEL)) {
875 res = -ENOMEM;
876 goto out;
877 }
878
879 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
880 if (!r) {
881 cpc925_printk(KERN_ERR, "Unable to get resource\n");
882 res = -ENOENT;
883 goto err1;
884 }
885
886 if (!devm_request_mem_region(&pdev->dev,
887 r->start,
30a61fff 888 resource_size(r),
2a9036af
HC		 889 pdev->name)) {
890 cpc925_printk(KERN_ERR, "Unable to request mem region\n");
891 res = -EBUSY;
892 goto err1;
893 }
894
30a61fff 895 vbase = devm_ioremap(&pdev->dev, r->start, resource_size(r));
2a9036af
HC		 896 if (!vbase) {
897 cpc925_printk(KERN_ERR, "Unable to ioremap device\n");
898 res = -ENOMEM;
899 goto err2;
900 }
901
902 nr_channels = cpc925_mc_get_channels(vbase);
903 mci = edac_mc_alloc(sizeof(struct cpc925_mc_pdata),
904 CPC925_NR_CSROWS, nr_channels + 1, edac_mc_idx);
905 if (!mci) {
906 cpc925_printk(KERN_ERR, "No memory for mem_ctl_info\n");
907 res = -ENOMEM;
908 goto err2;
909 }
910
911 pdata = mci->pvt_info;
912 pdata->vbase = vbase;
913 pdata->edac_idx = edac_mc_idx++;
914 pdata->name = pdev->name;
915
916 mci->dev = &pdev->dev;
917 platform_set_drvdata(pdev, mci);
918 mci->dev_name = dev_name(&pdev->dev);
919 mci->mtype_cap = MEM_FLAG_RDDR | MEM_FLAG_DDR;
920 mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
921 mci->edac_cap = EDAC_FLAG_SECDED;
922 mci->mod_name = CPC925_EDAC_MOD_STR;
923 mci->mod_ver = CPC925_EDAC_REVISION;
924 mci->ctl_name = pdev->name;
925
926 if (edac_op_state == EDAC_OPSTATE_POLL)
927 mci->edac_check = cpc925_mc_check;
928
929 mci->ctl_page_to_phys = NULL;
930 mci->scrub_mode = SCRUB_SW_SRC;
931 mci->set_sdram_scrub_rate = NULL;
932 mci->get_sdram_scrub_rate = cpc925_get_sdram_scrub_rate;
933
934 cpc925_init_csrows(mci);
935
936 /* Setup memory controller registers */
937 cpc925_mc_init(mci);
938
939 if (edac_mc_add_mc(mci) > 0) {
940 cpc925_mc_printk(mci, KERN_ERR, "Failed edac_mc_add_mc()\n");
941 goto err3;
942 }
943
944 cpc925_add_edac_devices(vbase);
945
946 /* get this far and it's successful */
947 debugf0("%s: success\n", __func__);
948
949 res = 0;
950 goto out;
951
952err3:
953 cpc925_mc_exit(mci);
954 edac_mc_free(mci);
955err2:
30a61fff 956 devm_release_mem_region(&pdev->dev, r->start, resource_size(r));
2a9036af
HC		 957err1:
958 devres_release_group(&pdev->dev, cpc925_probe);
959out:
960 return res;
961}
962
963static int cpc925_remove(struct platform_device *pdev)
964{
965 struct mem_ctl_info *mci = platform_get_drvdata(pdev);
966
967 /*
968 * Delete common edac devices before edac mc, because
969 * the former share the MMIO of the latter.
970 */
971 cpc925_del_edac_devices();
972 cpc925_mc_exit(mci);
973
974 edac_mc_del_mc(&pdev->dev);
975 edac_mc_free(mci);
976
977 return 0;
978}
979
980static struct platform_driver cpc925_edac_driver = {
981 .probe = cpc925_probe,
982 .remove = cpc925_remove,
983 .driver = {
984 .name = "cpc925_edac",
985 }
986};
987
988static int __init cpc925_edac_init(void)
989{
990 int ret = 0;
991
992 printk(KERN_INFO "IBM CPC925 EDAC driver " CPC925_EDAC_REVISION "\n");
993 printk(KERN_INFO "\t(c) 2008 Wind River Systems, Inc\n");
994
995 /* Only support POLL mode so far */
996 edac_op_state = EDAC_OPSTATE_POLL;
997
998 ret = platform_driver_register(&cpc925_edac_driver);
999 if (ret) {
1000 printk(KERN_WARNING "Failed to register %s\n",
1001 CPC925_EDAC_MOD_STR);
1002 }
1003
1004 return ret;
1005}
1006
1007static void __exit cpc925_edac_exit(void)
1008{
1009 platform_driver_unregister(&cpc925_edac_driver);
1010}
1011
1012module_init(cpc925_edac_init);
1013module_exit(cpc925_edac_exit);
1014
1015MODULE_LICENSE("GPL");
1016MODULE_AUTHOR("Cao Qingtao <[email protected]>");
1017MODULE_DESCRIPTION("IBM CPC925 Bridge and MC EDAC kernel module");
Empty description
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