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powerpc/mm: Drop the unnecessary region check
[linux-2.6-block.git] / drivers / edac / cpc925_edac.c
CommitLineData
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 <qingtao.cao@windriver.com>
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>
5a0e3ad6 28#include <linux/gfp.h>
2a9036af 29
2a9036af
HC		 30#include "edac_module.h"
31
152ba394 32#define CPC925_EDAC_REVISION " Ver: 1.0.0"
2a9036af
HC		 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};
ce395088 92#define APIMASK_ADI(n) CPC925_BIT(((n)+1))
2a9036af
HC		 93
94/************************************************************
95 * Processor Interface Exception Register (APIEXCP)
96 ************************************************************/
97#define REG_APIEXCP_OFFSET 0x30060
98enum apiexcp_bits {
99 APIEXCP_DART = CPC925_BIT(0), /* DART Exception */
100 APIEXCP_ADI0 = CPC925_BIT(1), /* Handshake Error on PI0_ADI */
101 APIEXCP_ADI1 = CPC925_BIT(2), /* Handshake Error on PI1_ADI */
102 APIEXCP_STAT = CPC925_BIT(3), /* Status Exception */
103 APIEXCP_DERR = CPC925_BIT(4), /* Data Error Exception */
104 APIEXCP_ADRS0 = CPC925_BIT(5), /* Addressing Exception on PI0 */
105 APIEXCP_ADRS1 = CPC925_BIT(6), /* Addressing Exception on PI1 */
106 /* BIT(7) Reserved */
107 APIEXCP_ECC_UE_H = CPC925_BIT(8), /* UECC upper */
108 APIEXCP_ECC_CE_H = CPC925_BIT(9), /* CECC upper */
109 APIEXCP_ECC_UE_L = CPC925_BIT(10), /* UECC lower */
110 APIEXCP_ECC_CE_L = CPC925_BIT(11), /* CECC lower */
111
112 CPU_EXCP_DETECTED = (APIEXCP_DART | APIEXCP_ADI0 | APIEXCP_ADI1 |
113 APIEXCP_STAT | APIEXCP_DERR | APIEXCP_ADRS0 |
114 APIEXCP_ADRS1),
115 UECC_EXCP_DETECTED = (APIEXCP_ECC_UE_H | APIEXCP_ECC_UE_L),
116 CECC_EXCP_DETECTED = (APIEXCP_ECC_CE_H | APIEXCP_ECC_CE_L),
117 ECC_EXCP_DETECTED = (UECC_EXCP_DETECTED | CECC_EXCP_DETECTED),
118};
119
120/************************************************************
121 * Memory Bus Configuration Register (MBCR)
122************************************************************/
123#define REG_MBCR_OFFSET 0x2190
124#define MBCR_64BITCFG_SHIFT 23
125#define MBCR_64BITCFG_MASK (1UL << MBCR_64BITCFG_SHIFT)
126#define MBCR_64BITBUS_SHIFT 22
127#define MBCR_64BITBUS_MASK (1UL << MBCR_64BITBUS_SHIFT)
128
129/************************************************************
130 * Memory Bank Mode Register (MBMR)
131************************************************************/
132#define REG_MBMR_OFFSET 0x21C0
133#define MBMR_MODE_MAX_VALUE 0xF
134#define MBMR_MODE_SHIFT 25
135#define MBMR_MODE_MASK (MBMR_MODE_MAX_VALUE << MBMR_MODE_SHIFT)
136#define MBMR_BBA_SHIFT 24
137#define MBMR_BBA_MASK (1UL << MBMR_BBA_SHIFT)
138
139/************************************************************
140 * Memory Bank Boundary Address Register (MBBAR)
141 ************************************************************/
142#define REG_MBBAR_OFFSET 0x21D0
143#define MBBAR_BBA_MAX_VALUE 0xFF
144#define MBBAR_BBA_SHIFT 24
145#define MBBAR_BBA_MASK (MBBAR_BBA_MAX_VALUE << MBBAR_BBA_SHIFT)
146
147/************************************************************
148 * Memory Scrub Control Register (MSCR)
149 ************************************************************/
150#define REG_MSCR_OFFSET 0x2400
151#define MSCR_SCRUB_MOD_MASK 0xC0000000 /* scrub_mod - bit0:1*/
152#define MSCR_BACKGR_SCRUB 0x40000000 /* 01 */
153#define MSCR_SI_SHIFT 16 /* si - bit8:15*/
154#define MSCR_SI_MAX_VALUE 0xFF
155#define MSCR_SI_MASK (MSCR_SI_MAX_VALUE << MSCR_SI_SHIFT)
156
157/************************************************************
158 * Memory Scrub Range Start Register (MSRSR)
159 ************************************************************/
160#define REG_MSRSR_OFFSET 0x2410
161
162/************************************************************
163 * Memory Scrub Range End Register (MSRER)
164 ************************************************************/
165#define REG_MSRER_OFFSET 0x2420
166
167/************************************************************
168 * Memory Scrub Pattern Register (MSPR)
169 ************************************************************/
170#define REG_MSPR_OFFSET 0x2430
171
172/************************************************************
173 * Memory Check Control Register (MCCR)
174 ************************************************************/
175#define REG_MCCR_OFFSET 0x2440
176enum mccr_bits {
177 MCCR_ECC_EN = CPC925_BIT(0), /* ECC high and low check */
178};
179
180/************************************************************
181 * Memory Check Range End Register (MCRER)
182 ************************************************************/
183#define REG_MCRER_OFFSET 0x2450
184
185/************************************************************
186 * Memory Error Address Register (MEAR)
187 ************************************************************/
188#define REG_MEAR_OFFSET 0x2460
189#define MEAR_BCNT_MAX_VALUE 0x3
190#define MEAR_BCNT_SHIFT 30
191#define MEAR_BCNT_MASK (MEAR_BCNT_MAX_VALUE << MEAR_BCNT_SHIFT)
192#define MEAR_RANK_MAX_VALUE 0x7
193#define MEAR_RANK_SHIFT 27
194#define MEAR_RANK_MASK (MEAR_RANK_MAX_VALUE << MEAR_RANK_SHIFT)
195#define MEAR_COL_MAX_VALUE 0x7FF
196#define MEAR_COL_SHIFT 16
197#define MEAR_COL_MASK (MEAR_COL_MAX_VALUE << MEAR_COL_SHIFT)
198#define MEAR_BANK_MAX_VALUE 0x3
199#define MEAR_BANK_SHIFT 14
200#define MEAR_BANK_MASK (MEAR_BANK_MAX_VALUE << MEAR_BANK_SHIFT)
201#define MEAR_ROW_MASK 0x00003FFF
202
203/************************************************************
204 * Memory Error Syndrome Register (MESR)
205 ************************************************************/
206#define REG_MESR_OFFSET 0x2470
207#define MESR_ECC_SYN_H_MASK 0xFF00
208#define MESR_ECC_SYN_L_MASK 0x00FF
209
210/************************************************************
211 * Memory Mode Control Register (MMCR)
212 ************************************************************/
213#define REG_MMCR_OFFSET 0x2500
214enum mmcr_bits {
215 MMCR_REG_DIMM_MODE = CPC925_BIT(3),
216};
217
218/*
219 * HyperTransport Link Registers
220 */
221/************************************************************
222 * Error Handling/Enumeration Scratch Pad Register (ERRCTRL)
223 ************************************************************/
224#define REG_ERRCTRL_OFFSET 0x70140
225enum errctrl_bits { /* nonfatal interrupts for */
226 ERRCTRL_SERR_NF = CPC925_BIT(0), /* system error */
227 ERRCTRL_CRC_NF = CPC925_BIT(1), /* CRC error */
228 ERRCTRL_RSP_NF = CPC925_BIT(2), /* Response error */
229 ERRCTRL_EOC_NF = CPC925_BIT(3), /* End-Of-Chain error */
230 ERRCTRL_OVF_NF = CPC925_BIT(4), /* Overflow error */
231 ERRCTRL_PROT_NF = CPC925_BIT(5), /* Protocol error */
232
233 ERRCTRL_RSP_ERR = CPC925_BIT(6), /* Response error received */
234 ERRCTRL_CHN_FAL = CPC925_BIT(7), /* Sync flooding detected */
235
236 HT_ERRCTRL_ENABLE = (ERRCTRL_SERR_NF | ERRCTRL_CRC_NF |
237 ERRCTRL_RSP_NF | ERRCTRL_EOC_NF |
238 ERRCTRL_OVF_NF | ERRCTRL_PROT_NF),
239 HT_ERRCTRL_DETECTED = (ERRCTRL_RSP_ERR | ERRCTRL_CHN_FAL),
240};
241
242/************************************************************
243 * Link Configuration and Link Control Register (LINKCTRL)
244 ************************************************************/
245#define REG_LINKCTRL_OFFSET 0x70110
246enum linkctrl_bits {
247 LINKCTRL_CRC_ERR = (CPC925_BIT(22) | CPC925_BIT(23)),
248 LINKCTRL_LINK_FAIL = CPC925_BIT(27),
249
250 HT_LINKCTRL_DETECTED = (LINKCTRL_CRC_ERR | LINKCTRL_LINK_FAIL),
251};
252
253/************************************************************
254 * Link FreqCap/Error/Freq/Revision ID Register (LINKERR)
255 ************************************************************/
256#define REG_LINKERR_OFFSET 0x70120
257enum linkerr_bits {
258 LINKERR_EOC_ERR = CPC925_BIT(17), /* End-Of-Chain error */
259 LINKERR_OVF_ERR = CPC925_BIT(18), /* Receive Buffer Overflow */
260 LINKERR_PROT_ERR = CPC925_BIT(19), /* Protocol error */
261
262 HT_LINKERR_DETECTED = (LINKERR_EOC_ERR | LINKERR_OVF_ERR |
263 LINKERR_PROT_ERR),
264};
265
266/************************************************************
267 * Bridge Control Register (BRGCTRL)
268 ************************************************************/
269#define REG_BRGCTRL_OFFSET 0x70300
270enum brgctrl_bits {
271 BRGCTRL_DETSERR = CPC925_BIT(0), /* SERR on Secondary Bus */
272 BRGCTRL_SECBUSRESET = CPC925_BIT(9), /* Secondary Bus Reset */
273};
274
275/* Private structure for edac memory controller */
276struct cpc925_mc_pdata {
277 void __iomem *vbase;
278 unsigned long total_mem;
279 const char *name;
280 int edac_idx;
281};
282
283/* Private structure for common edac device */
284struct cpc925_dev_info {
285 void __iomem *vbase;
286 struct platform_device *pdev;
287 char *ctl_name;
288 int edac_idx;
289 struct edac_device_ctl_info *edac_dev;
290 void (*init)(struct cpc925_dev_info *dev_info);
291 void (*exit)(struct cpc925_dev_info *dev_info);
292 void (*check)(struct edac_device_ctl_info *edac_dev);
293};
294
295/* Get total memory size from Open Firmware DTB */
296static void get_total_mem(struct cpc925_mc_pdata *pdata)
297{
298 struct device_node *np = NULL;
299 const unsigned int *reg, *reg_end;
300 int len, sw, aw;
301 unsigned long start, size;
302
303 np = of_find_node_by_type(NULL, "memory");
304 if (!np)
305 return;
306
307 aw = of_n_addr_cells(np);
308 sw = of_n_size_cells(np);
309 reg = (const unsigned int *)of_get_property(np, "reg", &len);
310 reg_end = reg + len/4;
311
312 pdata->total_mem = 0;
313 do {
314 start = of_read_number(reg, aw);
315 reg += aw;
316 size = of_read_number(reg, sw);
317 reg += sw;
956b9ba1 318 edac_dbg(1, "start 0x%lx, size 0x%lx\n", start, size);
2a9036af
HC		 319 pdata->total_mem += size;
320 } while (reg < reg_end);
321
322 of_node_put(np);
956b9ba1 323 edac_dbg(0, "total_mem 0x%lx\n", pdata->total_mem);
2a9036af
HC		 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;
084a4fcc 330 struct dimm_info *dimm;
fd63312d 331 enum dev_type dtype;
084a4fcc 332 int index, j;
fd63312d 333 u32 mbmr, mbbar, bba, grain;
a895bf8b 334 unsigned long row_size, nr_pages, last_nr_pages = 0;
2a9036af
HC		 335
336 get_total_mem(pdata);
337
338 for (index = 0; index < mci->nr_csrows; index++) {
339 mbmr = __raw_readl(pdata->vbase + REG_MBMR_OFFSET +
340 0x20 * index);
341 mbbar = __raw_readl(pdata->vbase + REG_MBBAR_OFFSET +
342 0x20 + index);
343 bba = (((mbmr & MBMR_BBA_MASK) >> MBMR_BBA_SHIFT) << 8) |
344 ((mbbar & MBBAR_BBA_MASK) >> MBBAR_BBA_SHIFT);
345
346 if (bba == 0)
347 continue; /* not populated */
348
de3910eb 349 csrow = mci->csrows[index];
2a9036af
HC		 350
351 row_size = bba * (1UL << 28); /* 256M */
352 csrow->first_page = last_nr_pages;
a895bf8b
MCC		 353 nr_pages = row_size >> PAGE_SHIFT;
354 csrow->last_page = csrow->first_page + nr_pages - 1;
2a9036af
HC		 355 last_nr_pages = csrow->last_page + 1;
356
fd63312d
MCC		 357 switch (csrow->nr_channels) {
358 case 1: /* Single channel */
359 grain = 32; /* four-beat burst of 32 bytes */
360 break;
361 case 2: /* Dual channel */
362 default:
363 grain = 64; /* four-beat burst of 64 bytes */
364 break;
365 }
366 switch ((mbmr & MBMR_MODE_MASK) >> MBMR_MODE_SHIFT) {
367 case 6: /* 0110, no way to differentiate X8 VS X16 */
368 case 5: /* 0101 */
369 case 8: /* 1000 */
370 dtype = DEV_X16;
371 break;
372 case 7: /* 0111 */
373 case 9: /* 1001 */
374 dtype = DEV_X8;
375 break;
376 default:
377 dtype = DEV_UNKNOWN;
378 break;
379 }
084a4fcc 380 for (j = 0; j < csrow->nr_channels; j++) {
de3910eb 381 dimm = csrow->channels[j]->dimm;
a895bf8b 382 dimm->nr_pages = nr_pages / csrow->nr_channels;
084a4fcc
MCC		 383 dimm->mtype = MEM_RDDR;
384 dimm->edac_mode = EDAC_SECDED;
fd63312d
MCC		 385 dimm->grain = grain;
386 dimm->dtype = dtype;
2a9036af
HC		 387 }
388 }
389}
390
391/* Enable memory controller ECC detection */
392static void cpc925_mc_init(struct mem_ctl_info *mci)
393{
394 struct cpc925_mc_pdata *pdata = mci->pvt_info;
395 u32 apimask;
396 u32 mccr;
397
398 /* Enable various ECC error exceptions */
399 apimask = __raw_readl(pdata->vbase + REG_APIMASK_OFFSET);
400 if ((apimask & ECC_MASK_ENABLE) == 0) {
401 apimask |= ECC_MASK_ENABLE;
402 __raw_writel(apimask, pdata->vbase + REG_APIMASK_OFFSET);
403 }
404
405 /* Enable ECC detection */
406 mccr = __raw_readl(pdata->vbase + REG_MCCR_OFFSET);
407 if ((mccr & MCCR_ECC_EN) == 0) {
408 mccr |= MCCR_ECC_EN;
409 __raw_writel(mccr, pdata->vbase + REG_MCCR_OFFSET);
410 }
411}
412
413/* Disable memory controller ECC detection */
414static void cpc925_mc_exit(struct mem_ctl_info *mci)
415{
416 /*
417 * WARNING:
418 * We are supposed to clear the ECC error detection bits,
419 * and it will be no problem to do so. However, once they
420 * are cleared here if we want to re-install CPC925 EDAC
421 * module later, setting them up in cpc925_mc_init() will
422 * trigger machine check exception.
423 * Also, it's ok to leave ECC error detection bits enabled,
424 * since they are reset to 1 by default or by boot loader.
425 */
426
427 return;
428}
429
430/*
431 * Revert DDR column/row/bank addresses into page frame number and
432 * offset in page.
433 *
434 * Suppose memory mode is 0x0111(128-bit mode, identical DIMM pairs),
435 * physical address(PA) bits to column address(CA) bits mappings are:
436 * CA 0 1 2 3 4 5 6 7 8 9 10
437 * PA 59 58 57 56 55 54 53 52 51 50 49
438 *
439 * physical address(PA) bits to bank address(BA) bits mappings are:
440 * BA 0 1
441 * PA 43 44
442 *
443 * physical address(PA) bits to row address(RA) bits mappings are:
444 * RA 0 1 2 3 4 5 6 7 8 9 10 11 12
445 * PA 36 35 34 48 47 46 45 40 41 42 39 38 37
446 */
447static void cpc925_mc_get_pfn(struct mem_ctl_info *mci, u32 mear,
448 unsigned long *pfn, unsigned long *offset, int *csrow)
449{
450 u32 bcnt, rank, col, bank, row;
451 u32 c;
452 unsigned long pa;
453 int i;
454
455 bcnt = (mear & MEAR_BCNT_MASK) >> MEAR_BCNT_SHIFT;
456 rank = (mear & MEAR_RANK_MASK) >> MEAR_RANK_SHIFT;
457 col = (mear & MEAR_COL_MASK) >> MEAR_COL_SHIFT;
458 bank = (mear & MEAR_BANK_MASK) >> MEAR_BANK_SHIFT;
459 row = mear & MEAR_ROW_MASK;
460
461 *csrow = rank;
462
463#ifdef CONFIG_EDAC_DEBUG
de3910eb 464 if (mci->csrows[rank]->first_page == 0) {
2a9036af
HC		 465 cpc925_mc_printk(mci, KERN_ERR, "ECC occurs in a "
466 "non-populated csrow, broken hardware?\n");
467 return;
468 }
469#endif
470
471 /* Revert csrow number */
de3910eb 472 pa = mci->csrows[rank]->first_page << PAGE_SHIFT;
2a9036af
HC		 473
474 /* Revert column address */
475 col += bcnt;
476 for (i = 0; i < 11; i++) {
477 c = col & 0x1;
478 col >>= 1;
479 pa |= c << (14 - i);
480 }
481
482 /* Revert bank address */
483 pa |= bank << 19;
484
485 /* Revert row address, in 4 steps */
486 for (i = 0; i < 3; i++) {
487 c = row & 0x1;
488 row >>= 1;
489 pa |= c << (26 - i);
490 }
491
492 for (i = 0; i < 3; i++) {
493 c = row & 0x1;
494 row >>= 1;
495 pa |= c << (21 + i);
496 }
497
498 for (i = 0; i < 4; i++) {
499 c = row & 0x1;
500 row >>= 1;
501 pa |= c << (18 - i);
502 }
503
504 for (i = 0; i < 3; i++) {
505 c = row & 0x1;
506 row >>= 1;
507 pa |= c << (29 - i);
508 }
509
510 *offset = pa & (PAGE_SIZE - 1);
511 *pfn = pa >> PAGE_SHIFT;
512
956b9ba1 513 edac_dbg(0, "ECC physical address 0x%lx\n", pa);
2a9036af
HC		 514}
515
516static int cpc925_mc_find_channel(struct mem_ctl_info *mci, u16 syndrome)
517{
518 if ((syndrome & MESR_ECC_SYN_H_MASK) == 0)
519 return 0;
520
521 if ((syndrome & MESR_ECC_SYN_L_MASK) == 0)
522 return 1;
523
524 cpc925_mc_printk(mci, KERN_INFO, "Unexpected syndrome value: 0x%x\n",
525 syndrome);
526 return 1;
527}
528
529/* Check memory controller registers for ECC errors */
530static void cpc925_mc_check(struct mem_ctl_info *mci)
531{
532 struct cpc925_mc_pdata *pdata = mci->pvt_info;
533 u32 apiexcp;
534 u32 mear;
535 u32 mesr;
536 u16 syndrome;
537 unsigned long pfn = 0, offset = 0;
538 int csrow = 0, channel = 0;
539
540 /* APIEXCP is cleared when read */
541 apiexcp = __raw_readl(pdata->vbase + REG_APIEXCP_OFFSET);
542 if ((apiexcp & ECC_EXCP_DETECTED) == 0)
543 return;
544
545 mesr = __raw_readl(pdata->vbase + REG_MESR_OFFSET);
546 syndrome = mesr | (MESR_ECC_SYN_H_MASK | MESR_ECC_SYN_L_MASK);
547
548 mear = __raw_readl(pdata->vbase + REG_MEAR_OFFSET);
549
550 /* Revert column/row addresses into page frame number, etc */
551 cpc925_mc_get_pfn(mci, mear, &pfn, &offset, &csrow);
552
553 if (apiexcp & CECC_EXCP_DETECTED) {
554 cpc925_mc_printk(mci, KERN_INFO, "DRAM CECC Fault\n");
555 channel = cpc925_mc_find_channel(mci, syndrome);
9eb07a7f 556 edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
df62b1e6
MCC		 557 pfn, offset, syndrome,
558 csrow, channel, -1,
03f7eae8 559 mci->ctl_name, "");
2a9036af
HC		 560 }
561
562 if (apiexcp & UECC_EXCP_DETECTED) {
563 cpc925_mc_printk(mci, KERN_INFO, "DRAM UECC Fault\n");
fa19ac4b 564 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
df62b1e6
MCC		 565 pfn, offset, 0,
566 csrow, -1, -1,
03f7eae8 567 mci->ctl_name, "");
2a9036af
HC		 568 }
569
570 cpc925_mc_printk(mci, KERN_INFO, "Dump registers:\n");
571 cpc925_mc_printk(mci, KERN_INFO, "APIMASK 0x%08x\n",
572 __raw_readl(pdata->vbase + REG_APIMASK_OFFSET));
573 cpc925_mc_printk(mci, KERN_INFO, "APIEXCP 0x%08x\n",
574 apiexcp);
575 cpc925_mc_printk(mci, KERN_INFO, "Mem Scrub Ctrl 0x%08x\n",
576 __raw_readl(pdata->vbase + REG_MSCR_OFFSET));
577 cpc925_mc_printk(mci, KERN_INFO, "Mem Scrub Rge Start 0x%08x\n",
578 __raw_readl(pdata->vbase + REG_MSRSR_OFFSET));
579 cpc925_mc_printk(mci, KERN_INFO, "Mem Scrub Rge End 0x%08x\n",
580 __raw_readl(pdata->vbase + REG_MSRER_OFFSET));
581 cpc925_mc_printk(mci, KERN_INFO, "Mem Scrub Pattern 0x%08x\n",
582 __raw_readl(pdata->vbase + REG_MSPR_OFFSET));
583 cpc925_mc_printk(mci, KERN_INFO, "Mem Chk Ctrl 0x%08x\n",
584 __raw_readl(pdata->vbase + REG_MCCR_OFFSET));
585 cpc925_mc_printk(mci, KERN_INFO, "Mem Chk Rge End 0x%08x\n",
586 __raw_readl(pdata->vbase + REG_MCRER_OFFSET));
587 cpc925_mc_printk(mci, KERN_INFO, "Mem Err Address 0x%08x\n",
588 mesr);
589 cpc925_mc_printk(mci, KERN_INFO, "Mem Err Syndrome 0x%08x\n",
590 syndrome);
591}
592
593/******************** CPU err device********************************/
ce395088
DES		 594static u32 cpc925_cpu_mask_disabled(void)
595{
37dc218b 596 struct device_node *cpunode;
ce395088
DES		 597 static u32 mask = 0;
598
599 /* use cached value if available */
600 if (mask != 0)
601 return mask;
602
603 mask = APIMASK_ADI0 | APIMASK_ADI1;
604
37dc218b 605 for_each_of_cpu_node(cpunode) {
ce395088 606 const u32 *reg = of_get_property(cpunode, "reg", NULL);
ce395088 607 if (reg == NULL || *reg > 2) {
2efdda4a 608 cpc925_printk(KERN_ERR, "Bad reg value at %pOF\n", cpunode);
ce395088
DES		 609 continue;
610 }
611
612 mask &= ~APIMASK_ADI(*reg);
613 }
614
615 if (mask != (APIMASK_ADI0 | APIMASK_ADI1)) {
616 /* We assume that each CPU sits on it's own PI and that
617 * for present CPUs the reg property equals to the PI
618 * interface id */
619 cpc925_printk(KERN_WARNING,
620 "Assuming PI id is equal to CPU MPIC id!\n");
621 }
622
ce395088
DES		 623 return mask;
624}
625
2a9036af
HC		 626/* Enable CPU Errors detection */
627static void cpc925_cpu_init(struct cpc925_dev_info *dev_info)
628{
629 u32 apimask;
ce395088 630 u32 cpumask;
2a9036af
HC		 631
632 apimask = __raw_readl(dev_info->vbase + REG_APIMASK_OFFSET);
ce395088
DES		 633
634 cpumask = cpc925_cpu_mask_disabled();
635 if (apimask & cpumask) {
636 cpc925_printk(KERN_WARNING, "CPU(s) not present, "
637 "but enabled in APIMASK, disabling\n");
638 apimask &= ~cpumask;
2a9036af 639 }
ce395088
DES		 640
641 if ((apimask & CPU_MASK_ENABLE) == 0)
642 apimask |= CPU_MASK_ENABLE;
643
644 __raw_writel(apimask, dev_info->vbase + REG_APIMASK_OFFSET);
2a9036af
HC		 645}
646
647/* Disable CPU Errors detection */
648static void cpc925_cpu_exit(struct cpc925_dev_info *dev_info)
649{
650 /*
651 * WARNING:
652 * We are supposed to clear the CPU error detection bits,
653 * and it will be no problem to do so. However, once they
654 * are cleared here if we want to re-install CPC925 EDAC
655 * module later, setting them up in cpc925_cpu_init() will
656 * trigger machine check exception.
657 * Also, it's ok to leave CPU error detection bits enabled,
658 * since they are reset to 1 by default.
659 */
660
661 return;
662}
663
664/* Check for CPU Errors */
665static void cpc925_cpu_check(struct edac_device_ctl_info *edac_dev)
666{
667 struct cpc925_dev_info *dev_info = edac_dev->pvt_info;
668 u32 apiexcp;
669 u32 apimask;
670
671 /* APIEXCP is cleared when read */
672 apiexcp = __raw_readl(dev_info->vbase + REG_APIEXCP_OFFSET);
673 if ((apiexcp & CPU_EXCP_DETECTED) == 0)
674 return;
675
ce395088
DES		 676 if ((apiexcp & ~cpc925_cpu_mask_disabled()) == 0)
677 return;
678
2a9036af
HC		 679 apimask = __raw_readl(dev_info->vbase + REG_APIMASK_OFFSET);
680 cpc925_printk(KERN_INFO, "Processor Interface Fault\n"
681 "Processor Interface register dump:\n");
682 cpc925_printk(KERN_INFO, "APIMASK 0x%08x\n", apimask);
683 cpc925_printk(KERN_INFO, "APIEXCP 0x%08x\n", apiexcp);
684
685 edac_device_handle_ue(edac_dev, 0, 0, edac_dev->ctl_name);
686}
687
688/******************** HT Link err device****************************/
689/* Enable HyperTransport Link Error detection */
690static void cpc925_htlink_init(struct cpc925_dev_info *dev_info)
691{
692 u32 ht_errctrl;
693
694 ht_errctrl = __raw_readl(dev_info->vbase + REG_ERRCTRL_OFFSET);
695 if ((ht_errctrl & HT_ERRCTRL_ENABLE) == 0) {
696 ht_errctrl |= HT_ERRCTRL_ENABLE;
697 __raw_writel(ht_errctrl, dev_info->vbase + REG_ERRCTRL_OFFSET);
698 }
699}
700
701/* Disable HyperTransport Link Error detection */
702static void cpc925_htlink_exit(struct cpc925_dev_info *dev_info)
703{
704 u32 ht_errctrl;
705
706 ht_errctrl = __raw_readl(dev_info->vbase + REG_ERRCTRL_OFFSET);
707 ht_errctrl &= ~HT_ERRCTRL_ENABLE;
708 __raw_writel(ht_errctrl, dev_info->vbase + REG_ERRCTRL_OFFSET);
709}
710
711/* Check for HyperTransport Link errors */
712static void cpc925_htlink_check(struct edac_device_ctl_info *edac_dev)
713{
714 struct cpc925_dev_info *dev_info = edac_dev->pvt_info;
715 u32 brgctrl = __raw_readl(dev_info->vbase + REG_BRGCTRL_OFFSET);
716 u32 linkctrl = __raw_readl(dev_info->vbase + REG_LINKCTRL_OFFSET);
717 u32 errctrl = __raw_readl(dev_info->vbase + REG_ERRCTRL_OFFSET);
718 u32 linkerr = __raw_readl(dev_info->vbase + REG_LINKERR_OFFSET);
719
720 if (!((brgctrl & BRGCTRL_DETSERR) ||
721 (linkctrl & HT_LINKCTRL_DETECTED) ||
722 (errctrl & HT_ERRCTRL_DETECTED) ||
723 (linkerr & HT_LINKERR_DETECTED)))
724 return;
725
726 cpc925_printk(KERN_INFO, "HT Link Fault\n"
727 "HT register dump:\n");
728 cpc925_printk(KERN_INFO, "Bridge Ctrl 0x%08x\n",
729 brgctrl);
730 cpc925_printk(KERN_INFO, "Link Config Ctrl 0x%08x\n",
731 linkctrl);
732 cpc925_printk(KERN_INFO, "Error Enum and Ctrl 0x%08x\n",
733 errctrl);
734 cpc925_printk(KERN_INFO, "Link Error 0x%08x\n",
735 linkerr);
736
737 /* Clear by write 1 */
738 if (brgctrl & BRGCTRL_DETSERR)
739 __raw_writel(BRGCTRL_DETSERR,
740 dev_info->vbase + REG_BRGCTRL_OFFSET);
741
742 if (linkctrl & HT_LINKCTRL_DETECTED)
743 __raw_writel(HT_LINKCTRL_DETECTED,
744 dev_info->vbase + REG_LINKCTRL_OFFSET);
745
746 /* Initiate Secondary Bus Reset to clear the chain failure */
747 if (errctrl & ERRCTRL_CHN_FAL)
748 __raw_writel(BRGCTRL_SECBUSRESET,
749 dev_info->vbase + REG_BRGCTRL_OFFSET);
750
751 if (errctrl & ERRCTRL_RSP_ERR)
752 __raw_writel(ERRCTRL_RSP_ERR,
753 dev_info->vbase + REG_ERRCTRL_OFFSET);
754
755 if (linkerr & HT_LINKERR_DETECTED)
756 __raw_writel(HT_LINKERR_DETECTED,
757 dev_info->vbase + REG_LINKERR_OFFSET);
758
759 edac_device_handle_ce(edac_dev, 0, 0, edac_dev->ctl_name);
760}
761
762static struct cpc925_dev_info cpc925_devs[] = {
763 {
764 .ctl_name = CPC925_CPU_ERR_DEV,
765 .init = cpc925_cpu_init,
766 .exit = cpc925_cpu_exit,
767 .check = cpc925_cpu_check,
768 },
769 {
770 .ctl_name = CPC925_HT_LINK_DEV,
771 .init = cpc925_htlink_init,
772 .exit = cpc925_htlink_exit,
773 .check = cpc925_htlink_check,
774 },
75a9551f 775 { }
2a9036af
HC		 776};
777
778/*
779 * Add CPU Err detection and HyperTransport Link Err detection
780 * as common "edac_device", they have no corresponding device
781 * nodes in the Open Firmware DTB and we have to add platform
782 * devices for them. Also, they will share the MMIO with that
783 * of memory controller.
784 */
785static void cpc925_add_edac_devices(void __iomem *vbase)
786{
787 struct cpc925_dev_info *dev_info;
788
789 if (!vbase) {
790 cpc925_printk(KERN_ERR, "MMIO not established yet\n");
791 return;
792 }
793
794 for (dev_info = &cpc925_devs[0]; dev_info->init; dev_info++) {
795 dev_info->vbase = vbase;
796 dev_info->pdev = platform_device_register_simple(
797 dev_info->ctl_name, 0, NULL, 0);
798 if (IS_ERR(dev_info->pdev)) {
799 cpc925_printk(KERN_ERR,
800 "Can't register platform device for %s\n",
801 dev_info->ctl_name);
802 continue;
803 }
804
805 /*
806 * Don't have to allocate private structure but
807 * make use of cpc925_devs[] instead.
808 */
809 dev_info->edac_idx = edac_device_alloc_index();
810 dev_info->edac_dev =
811 edac_device_alloc_ctl_info(0, dev_info->ctl_name,
812 1, NULL, 0, 0, NULL, 0, dev_info->edac_idx);
813 if (!dev_info->edac_dev) {
814 cpc925_printk(KERN_ERR, "No memory for edac device\n");
815 goto err1;
816 }
817
818 dev_info->edac_dev->pvt_info = dev_info;
819 dev_info->edac_dev->dev = &dev_info->pdev->dev;
820 dev_info->edac_dev->ctl_name = dev_info->ctl_name;
821 dev_info->edac_dev->mod_name = CPC925_EDAC_MOD_STR;
822 dev_info->edac_dev->dev_name = dev_name(&dev_info->pdev->dev);
823
824 if (edac_op_state == EDAC_OPSTATE_POLL)
825 dev_info->edac_dev->edac_check = dev_info->check;
826
827 if (dev_info->init)
828 dev_info->init(dev_info);
829
830 if (edac_device_add_device(dev_info->edac_dev) > 0) {
831 cpc925_printk(KERN_ERR,
832 "Unable to add edac device for %s\n",
833 dev_info->ctl_name);
834 goto err2;
835 }
836
956b9ba1
JP		 837 edac_dbg(0, "Successfully added edac device for %s\n",
838 dev_info->ctl_name);
2a9036af
HC		 839
840 continue;
841
842err2:
843 if (dev_info->exit)
844 dev_info->exit(dev_info);
845 edac_device_free_ctl_info(dev_info->edac_dev);
846err1:
847 platform_device_unregister(dev_info->pdev);
848 }
849}
850
851/*
852 * Delete the common "edac_device" for CPU Err Detection
853 * and HyperTransport Link Err Detection
854 */
855static void cpc925_del_edac_devices(void)
856{
857 struct cpc925_dev_info *dev_info;
858
859 for (dev_info = &cpc925_devs[0]; dev_info->init; dev_info++) {
860 if (dev_info->edac_dev) {
861 edac_device_del_device(dev_info->edac_dev->dev);
862 edac_device_free_ctl_info(dev_info->edac_dev);
863 platform_device_unregister(dev_info->pdev);
864 }
865
866 if (dev_info->exit)
867 dev_info->exit(dev_info);
868
956b9ba1
JP		 869 edac_dbg(0, "Successfully deleted edac device for %s\n",
870 dev_info->ctl_name);
2a9036af
HC		 871 }
872}
873
25985edc 874/* Convert current back-ground scrub rate into byte/sec bandwidth */
39094443 875static int cpc925_get_sdram_scrub_rate(struct mem_ctl_info *mci)
2a9036af
HC		 876{
877 struct cpc925_mc_pdata *pdata = mci->pvt_info;
39094443 878 int bw;
2a9036af
HC		 879 u32 mscr;
880 u8 si;
881
882 mscr = __raw_readl(pdata->vbase + REG_MSCR_OFFSET);
883 si = (mscr & MSCR_SI_MASK) >> MSCR_SI_SHIFT;
884
956b9ba1 885 edac_dbg(0, "Mem Scrub Ctrl Register 0x%x\n", mscr);
2a9036af
HC		 886
887 if (((mscr & MSCR_SCRUB_MOD_MASK) != MSCR_BACKGR_SCRUB) ||
888 (si == 0)) {
889 cpc925_mc_printk(mci, KERN_INFO, "Scrub mode not enabled\n");
39094443 890 bw = 0;
2a9036af 891 } else
39094443 892 bw = CPC925_SCRUB_BLOCK_SIZE * 0xFA67 / si;
2a9036af 893
39094443 894 return bw;
2a9036af
HC		 895}
896
897/* Return 0 for single channel; 1 for dual channel */
898static int cpc925_mc_get_channels(void __iomem *vbase)
899{
900 int dual = 0;
901 u32 mbcr;
902
903 mbcr = __raw_readl(vbase + REG_MBCR_OFFSET);
904
905 /*
906 * Dual channel only when 128-bit wide physical bus
907 * and 128-bit configuration.
908 */
909 if (((mbcr & MBCR_64BITCFG_MASK) == 0) &&
910 ((mbcr & MBCR_64BITBUS_MASK) == 0))
911 dual = 1;
912
956b9ba1 913 edac_dbg(0, "%s channel\n", (dual > 0) ? "Dual" : "Single");
2a9036af
HC		 914
915 return dual;
916}
917
9b3c6e85 918static int cpc925_probe(struct platform_device *pdev)
2a9036af
HC		 919{
920 static int edac_mc_idx;
921 struct mem_ctl_info *mci;
df62b1e6 922 struct edac_mc_layer layers[2];
2a9036af
HC		 923 void __iomem *vbase;
924 struct cpc925_mc_pdata *pdata;
925 struct resource *r;
926 int res = 0, nr_channels;
927
956b9ba1 928 edac_dbg(0, "%s platform device found!\n", pdev->name);
2a9036af
HC		 929
930 if (!devres_open_group(&pdev->dev, cpc925_probe, GFP_KERNEL)) {
931 res = -ENOMEM;
932 goto out;
933 }
934
935 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
936 if (!r) {
937 cpc925_printk(KERN_ERR, "Unable to get resource\n");
938 res = -ENOENT;
939 goto err1;
940 }
941
942 if (!devm_request_mem_region(&pdev->dev,
943 r->start,
30a61fff 944 resource_size(r),
2a9036af
HC		 945 pdev->name)) {
946 cpc925_printk(KERN_ERR, "Unable to request mem region\n");
947 res = -EBUSY;
948 goto err1;
949 }
950
30a61fff 951 vbase = devm_ioremap(&pdev->dev, r->start, resource_size(r));
2a9036af
HC		 952 if (!vbase) {
953 cpc925_printk(KERN_ERR, "Unable to ioremap device\n");
954 res = -ENOMEM;
955 goto err2;
956 }
957
084a4fcc 958 nr_channels = cpc925_mc_get_channels(vbase) + 1;
df62b1e6
MCC		 959
960 layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
961 layers[0].size = CPC925_NR_CSROWS;
962 layers[0].is_virt_csrow = true;
963 layers[1].type = EDAC_MC_LAYER_CHANNEL;
964 layers[1].size = nr_channels;
965 layers[1].is_virt_csrow = false;
ca0907b9 966 mci = edac_mc_alloc(edac_mc_idx, ARRAY_SIZE(layers), layers,
df62b1e6 967 sizeof(struct cpc925_mc_pdata));
2a9036af
HC		 968 if (!mci) {
969 cpc925_printk(KERN_ERR, "No memory for mem_ctl_info\n");
970 res = -ENOMEM;
971 goto err2;
972 }
973
974 pdata = mci->pvt_info;
975 pdata->vbase = vbase;
976 pdata->edac_idx = edac_mc_idx++;
977 pdata->name = pdev->name;
978
fd687502 979 mci->pdev = &pdev->dev;
2a9036af
HC		 980 platform_set_drvdata(pdev, mci);
981 mci->dev_name = dev_name(&pdev->dev);
982 mci->mtype_cap = MEM_FLAG_RDDR | MEM_FLAG_DDR;
983 mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
984 mci->edac_cap = EDAC_FLAG_SECDED;
985 mci->mod_name = CPC925_EDAC_MOD_STR;
2a9036af
HC		 986 mci->ctl_name = pdev->name;
987
988 if (edac_op_state == EDAC_OPSTATE_POLL)
989 mci->edac_check = cpc925_mc_check;
990
991 mci->ctl_page_to_phys = NULL;
992 mci->scrub_mode = SCRUB_SW_SRC;
993 mci->set_sdram_scrub_rate = NULL;
994 mci->get_sdram_scrub_rate = cpc925_get_sdram_scrub_rate;
995
996 cpc925_init_csrows(mci);
997
998 /* Setup memory controller registers */
999 cpc925_mc_init(mci);
1000
1001 if (edac_mc_add_mc(mci) > 0) {
1002 cpc925_mc_printk(mci, KERN_ERR, "Failed edac_mc_add_mc()\n");
1003 goto err3;
1004 }
1005
1006 cpc925_add_edac_devices(vbase);
1007
1008 /* get this far and it's successful */
956b9ba1 1009 edac_dbg(0, "success\n");
2a9036af
HC		 1010
1011 res = 0;
1012 goto out;
1013
1014err3:
1015 cpc925_mc_exit(mci);
1016 edac_mc_free(mci);
1017err2:
30a61fff 1018 devm_release_mem_region(&pdev->dev, r->start, resource_size(r));
2a9036af
HC		 1019err1:
1020 devres_release_group(&pdev->dev, cpc925_probe);
1021out:
1022 return res;
1023}
1024
1025static int cpc925_remove(struct platform_device *pdev)
1026{
1027 struct mem_ctl_info *mci = platform_get_drvdata(pdev);
1028
1029 /*
1030 * Delete common edac devices before edac mc, because
1031 * the former share the MMIO of the latter.
1032 */
1033 cpc925_del_edac_devices();
1034 cpc925_mc_exit(mci);
1035
1036 edac_mc_del_mc(&pdev->dev);
1037 edac_mc_free(mci);
1038
1039 return 0;
1040}
1041
1042static struct platform_driver cpc925_edac_driver = {
1043 .probe = cpc925_probe,
1044 .remove = cpc925_remove,
1045 .driver = {
1046 .name = "cpc925_edac",
1047 }
1048};
1049
1050static int __init cpc925_edac_init(void)
1051{
1052 int ret = 0;
1053
1054 printk(KERN_INFO "IBM CPC925 EDAC driver " CPC925_EDAC_REVISION "\n");
1055 printk(KERN_INFO "\t(c) 2008 Wind River Systems, Inc\n");
1056
1057 /* Only support POLL mode so far */
1058 edac_op_state = EDAC_OPSTATE_POLL;
1059
1060 ret = platform_driver_register(&cpc925_edac_driver);
1061 if (ret) {
1062 printk(KERN_WARNING "Failed to register %s\n",
1063 CPC925_EDAC_MOD_STR);
1064 }
1065
1066 return ret;
1067}
1068
1069static void __exit cpc925_edac_exit(void)
1070{
1071 platform_driver_unregister(&cpc925_edac_driver);
1072}
1073
1074module_init(cpc925_edac_init);
1075module_exit(cpc925_edac_exit);
1076
1077MODULE_LICENSE("GPL");
1078MODULE_AUTHOR("Cao Qingtao <qingtao.cao@windriver.com>");
1079MODULE_DESCRIPTION("IBM CPC925 Bridge and MC EDAC kernel module");
Linux 6.x block layer and io_uring tree(s)