drivers/edac/cpc925_edac.c

   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>
  28 #include <linux/gfp.h>
  29
  30 #include "edac_module.h"
  31
  32 #define CPC925_EDAC_REVISION    " Ver: 1.0.0"
  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
  72 enum 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 #define APIMASK_ADI(n)          CPC925_BIT(((n)+1))
  93
  94 /************************************************************
  95  *      Processor Interface Exception Register (APIEXCP)
  96  ************************************************************/
  97 #define REG_APIEXCP_OFFSET      0x30060
  98 enum 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
 176 enum 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
 214 enum 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
 225 enum 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
 246 enum 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
 257 enum 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
 270 enum 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 */
 276 struct 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 */
 284 struct 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 */
 296 static 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;
 318                 edac_dbg(1, "start 0x%lx, size 0x%lx\n", start, size);
 319                 pdata->total_mem += size;
 320         } while (reg < reg_end);
 321
 322         of_node_put(np);
 323         edac_dbg(0, "total_mem 0x%lx\n", pdata->total_mem);
 324 }
 325
 326 static 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         struct dimm_info *dimm;
 331         enum dev_type dtype;
 332         int index, j;
 333         u32 mbmr, mbbar, bba, grain;
 334         unsigned long row_size, nr_pages, last_nr_pages = 0;
 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
 349                 csrow = mci->csrows[index];
 350
 351                 row_size = bba * (1UL << 28);   /* 256M */
 352                 csrow->first_page = last_nr_pages;
 353                 nr_pages = row_size >> PAGE_SHIFT;
 354                 csrow->last_page = csrow->first_page + nr_pages - 1;
 355                 last_nr_pages = csrow->last_page + 1;
 356
 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                 }
 380                 for (j = 0; j < csrow->nr_channels; j++) {
 381                         dimm = csrow->channels[j]->dimm;
 382                         dimm->nr_pages = nr_pages / csrow->nr_channels;
 383                         dimm->mtype = MEM_RDDR;
 384                         dimm->edac_mode = EDAC_SECDED;
 385                         dimm->grain = grain;
 386                         dimm->dtype = dtype;
 387                 }
 388         }
 389 }
 390
 391 /* Enable memory controller ECC detection */
 392 static 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 */
 414 static 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  */
 447 static 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
 464         if (mci->csrows[rank]->first_page == 0) {
 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 */
 472         pa = mci->csrows[rank]->first_page << PAGE_SHIFT;
 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
 513         edac_dbg(0, "ECC physical address 0x%lx\n", pa);
 514 }
 515
 516 static 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 */
 530 static 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);
 556                 edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
 557                                      pfn, offset, syndrome,
 558                                      csrow, channel, -1,
 559                                      mci->ctl_name, "");
 560         }
 561
 562         if (apiexcp & UECC_EXCP_DETECTED) {
 563                 cpc925_mc_printk(mci, KERN_INFO, "DRAM UECC Fault\n");
 564                 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
 565                                      pfn, offset, 0,
 566                                      csrow, -1, -1,
 567                                      mci->ctl_name, "");
 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********************************/
 594 static u32 cpc925_cpu_mask_disabled(void)
 595 {
 596         struct device_node *cpus;
 597         struct device_node *cpunode = NULL;
 598         static u32 mask = 0;
 599
 600         /* use cached value if available */
 601         if (mask != 0)
 602                 return mask;
 603
 604         mask = APIMASK_ADI0 | APIMASK_ADI1;
 605
 606         cpus = of_find_node_by_path("/cpus");
 607         if (cpus == NULL) {
 608                 cpc925_printk(KERN_DEBUG, "No /cpus node !\n");
 609                 return 0;
 610         }
 611
 612         while ((cpunode = of_get_next_child(cpus, cpunode)) != NULL) {
 613                 const u32 *reg = of_get_property(cpunode, "reg", NULL);
 614
 615                 if (strcmp(cpunode->type, "cpu")) {
 616                         cpc925_printk(KERN_ERR, "Not a cpu node in /cpus: %s\n", cpunode->name);
 617                         continue;
 618                 }
 619
 620                 if (reg == NULL || *reg > 2) {
 621                         cpc925_printk(KERN_ERR, "Bad reg value at %pOF\n", cpunode);
 622                         continue;
 623                 }
 624
 625                 mask &= ~APIMASK_ADI(*reg);
 626         }
 627
 628         if (mask != (APIMASK_ADI0 | APIMASK_ADI1)) {
 629                 /* We assume that each CPU sits on it's own PI and that
 630                  * for present CPUs the reg property equals to the PI
 631                  * interface id */
 632                 cpc925_printk(KERN_WARNING,
 633                                 "Assuming PI id is equal to CPU MPIC id!\n");
 634         }
 635
 636         of_node_put(cpunode);
 637         of_node_put(cpus);
 638
 639         return mask;
 640 }
 641
 642 /* Enable CPU Errors detection */
 643 static void cpc925_cpu_init(struct cpc925_dev_info *dev_info)
 644 {
 645         u32 apimask;
 646         u32 cpumask;
 647
 648         apimask = __raw_readl(dev_info->vbase + REG_APIMASK_OFFSET);
 649
 650         cpumask = cpc925_cpu_mask_disabled();
 651         if (apimask & cpumask) {
 652                 cpc925_printk(KERN_WARNING, "CPU(s) not present, "
 653                                 "but enabled in APIMASK, disabling\n");
 654                 apimask &= ~cpumask;
 655         }
 656
 657         if ((apimask & CPU_MASK_ENABLE) == 0)
 658                 apimask |= CPU_MASK_ENABLE;
 659
 660         __raw_writel(apimask, dev_info->vbase + REG_APIMASK_OFFSET);
 661 }
 662
 663 /* Disable CPU Errors detection */
 664 static void cpc925_cpu_exit(struct cpc925_dev_info *dev_info)
 665 {
 666         /*
 667          * WARNING:
 668          * We are supposed to clear the CPU error detection bits,
 669          * and it will be no problem to do so. However, once they
 670          * are cleared here if we want to re-install CPC925 EDAC
 671          * module later, setting them up in cpc925_cpu_init() will
 672          * trigger machine check exception.
 673          * Also, it's ok to leave CPU error detection bits enabled,
 674          * since they are reset to 1 by default.
 675          */
 676
 677         return;
 678 }
 679
 680 /* Check for CPU Errors */
 681 static void cpc925_cpu_check(struct edac_device_ctl_info *edac_dev)
 682 {
 683         struct cpc925_dev_info *dev_info = edac_dev->pvt_info;
 684         u32 apiexcp;
 685         u32 apimask;
 686
 687         /* APIEXCP is cleared when read */
 688         apiexcp = __raw_readl(dev_info->vbase + REG_APIEXCP_OFFSET);
 689         if ((apiexcp & CPU_EXCP_DETECTED) == 0)
 690                 return;
 691
 692         if ((apiexcp & ~cpc925_cpu_mask_disabled()) == 0)
 693                 return;
 694
 695         apimask = __raw_readl(dev_info->vbase + REG_APIMASK_OFFSET);
 696         cpc925_printk(KERN_INFO, "Processor Interface Fault\n"
 697                                  "Processor Interface register dump:\n");
 698         cpc925_printk(KERN_INFO, "APIMASK               0x%08x\n", apimask);
 699         cpc925_printk(KERN_INFO, "APIEXCP               0x%08x\n", apiexcp);
 700
 701         edac_device_handle_ue(edac_dev, 0, 0, edac_dev->ctl_name);
 702 }
 703
 704 /******************** HT Link err device****************************/
 705 /* Enable HyperTransport Link Error detection */
 706 static void cpc925_htlink_init(struct cpc925_dev_info *dev_info)
 707 {
 708         u32 ht_errctrl;
 709
 710         ht_errctrl = __raw_readl(dev_info->vbase + REG_ERRCTRL_OFFSET);
 711         if ((ht_errctrl & HT_ERRCTRL_ENABLE) == 0) {
 712                 ht_errctrl |= HT_ERRCTRL_ENABLE;
 713                 __raw_writel(ht_errctrl, dev_info->vbase + REG_ERRCTRL_OFFSET);
 714         }
 715 }
 716
 717 /* Disable HyperTransport Link Error detection */
 718 static void cpc925_htlink_exit(struct cpc925_dev_info *dev_info)
 719 {
 720         u32 ht_errctrl;
 721
 722         ht_errctrl = __raw_readl(dev_info->vbase + REG_ERRCTRL_OFFSET);
 723         ht_errctrl &= ~HT_ERRCTRL_ENABLE;
 724         __raw_writel(ht_errctrl, dev_info->vbase + REG_ERRCTRL_OFFSET);
 725 }
 726
 727 /* Check for HyperTransport Link errors */
 728 static void cpc925_htlink_check(struct edac_device_ctl_info *edac_dev)
 729 {
 730         struct cpc925_dev_info *dev_info = edac_dev->pvt_info;
 731         u32 brgctrl = __raw_readl(dev_info->vbase + REG_BRGCTRL_OFFSET);
 732         u32 linkctrl = __raw_readl(dev_info->vbase + REG_LINKCTRL_OFFSET);
 733         u32 errctrl = __raw_readl(dev_info->vbase + REG_ERRCTRL_OFFSET);
 734         u32 linkerr = __raw_readl(dev_info->vbase + REG_LINKERR_OFFSET);
 735
 736         if (!((brgctrl & BRGCTRL_DETSERR) ||
 737               (linkctrl & HT_LINKCTRL_DETECTED) ||
 738               (errctrl & HT_ERRCTRL_DETECTED) ||
 739               (linkerr & HT_LINKERR_DETECTED)))
 740                 return;
 741
 742         cpc925_printk(KERN_INFO, "HT Link Fault\n"
 743                                  "HT register dump:\n");
 744         cpc925_printk(KERN_INFO, "Bridge Ctrl                   0x%08x\n",
 745                       brgctrl);
 746         cpc925_printk(KERN_INFO, "Link Config Ctrl              0x%08x\n",
 747                       linkctrl);
 748         cpc925_printk(KERN_INFO, "Error Enum and Ctrl           0x%08x\n",
 749                       errctrl);
 750         cpc925_printk(KERN_INFO, "Link Error                    0x%08x\n",
 751                       linkerr);
 752
 753         /* Clear by write 1 */
 754         if (brgctrl & BRGCTRL_DETSERR)
 755                 __raw_writel(BRGCTRL_DETSERR,
 756                                 dev_info->vbase + REG_BRGCTRL_OFFSET);
 757
 758         if (linkctrl & HT_LINKCTRL_DETECTED)
 759                 __raw_writel(HT_LINKCTRL_DETECTED,
 760                                 dev_info->vbase + REG_LINKCTRL_OFFSET);
 761
 762         /* Initiate Secondary Bus Reset to clear the chain failure */
 763         if (errctrl & ERRCTRL_CHN_FAL)
 764                 __raw_writel(BRGCTRL_SECBUSRESET,
 765                                 dev_info->vbase + REG_BRGCTRL_OFFSET);
 766
 767         if (errctrl & ERRCTRL_RSP_ERR)
 768                 __raw_writel(ERRCTRL_RSP_ERR,
 769                                 dev_info->vbase + REG_ERRCTRL_OFFSET);
 770
 771         if (linkerr & HT_LINKERR_DETECTED)
 772                 __raw_writel(HT_LINKERR_DETECTED,
 773                                 dev_info->vbase + REG_LINKERR_OFFSET);
 774
 775         edac_device_handle_ce(edac_dev, 0, 0, edac_dev->ctl_name);
 776 }
 777
 778 static struct cpc925_dev_info cpc925_devs[] = {
 779         {
 780         .ctl_name = CPC925_CPU_ERR_DEV,
 781         .init = cpc925_cpu_init,
 782         .exit = cpc925_cpu_exit,
 783         .check = cpc925_cpu_check,
 784         },
 785         {
 786         .ctl_name = CPC925_HT_LINK_DEV,
 787         .init = cpc925_htlink_init,
 788         .exit = cpc925_htlink_exit,
 789         .check = cpc925_htlink_check,
 790         },
 791         { }
 792 };
 793
 794 /*
 795  * Add CPU Err detection and HyperTransport Link Err detection
 796  * as common "edac_device", they have no corresponding device
 797  * nodes in the Open Firmware DTB and we have to add platform
 798  * devices for them. Also, they will share the MMIO with that
 799  * of memory controller.
 800  */
 801 static void cpc925_add_edac_devices(void __iomem *vbase)
 802 {
 803         struct cpc925_dev_info *dev_info;
 804
 805         if (!vbase) {
 806                 cpc925_printk(KERN_ERR, "MMIO not established yet\n");
 807                 return;
 808         }
 809
 810         for (dev_info = &cpc925_devs[0]; dev_info->init; dev_info++) {
 811                 dev_info->vbase = vbase;
 812                 dev_info->pdev = platform_device_register_simple(
 813                                         dev_info->ctl_name, 0, NULL, 0);
 814                 if (IS_ERR(dev_info->pdev)) {
 815                         cpc925_printk(KERN_ERR,
 816                                 "Can't register platform device for %s\n",
 817                                 dev_info->ctl_name);
 818                         continue;
 819                 }
 820
 821                 /*
 822                  * Don't have to allocate private structure but
 823                  * make use of cpc925_devs[] instead.
 824                  */
 825                 dev_info->edac_idx = edac_device_alloc_index();
 826                 dev_info->edac_dev =
 827                         edac_device_alloc_ctl_info(0, dev_info->ctl_name,
 828                                 1, NULL, 0, 0, NULL, 0, dev_info->edac_idx);
 829                 if (!dev_info->edac_dev) {
 830                         cpc925_printk(KERN_ERR, "No memory for edac device\n");
 831                         goto err1;
 832                 }
 833
 834                 dev_info->edac_dev->pvt_info = dev_info;
 835                 dev_info->edac_dev->dev = &dev_info->pdev->dev;
 836                 dev_info->edac_dev->ctl_name = dev_info->ctl_name;
 837                 dev_info->edac_dev->mod_name = CPC925_EDAC_MOD_STR;
 838                 dev_info->edac_dev->dev_name = dev_name(&dev_info->pdev->dev);
 839
 840                 if (edac_op_state == EDAC_OPSTATE_POLL)
 841                         dev_info->edac_dev->edac_check = dev_info->check;
 842
 843                 if (dev_info->init)
 844                         dev_info->init(dev_info);
 845
 846                 if (edac_device_add_device(dev_info->edac_dev) > 0) {
 847                         cpc925_printk(KERN_ERR,
 848                                 "Unable to add edac device for %s\n",
 849                                 dev_info->ctl_name);
 850                         goto err2;
 851                 }
 852
 853                 edac_dbg(0, "Successfully added edac device for %s\n",
 854                          dev_info->ctl_name);
 855
 856                 continue;
 857
 858 err2:
 859                 if (dev_info->exit)
 860                         dev_info->exit(dev_info);
 861                 edac_device_free_ctl_info(dev_info->edac_dev);
 862 err1:
 863                 platform_device_unregister(dev_info->pdev);
 864         }
 865 }
 866
 867 /*
 868  * Delete the common "edac_device" for CPU Err Detection
 869  * and HyperTransport Link Err Detection
 870  */
 871 static void cpc925_del_edac_devices(void)
 872 {
 873         struct cpc925_dev_info *dev_info;
 874
 875         for (dev_info = &cpc925_devs[0]; dev_info->init; dev_info++) {
 876                 if (dev_info->edac_dev) {
 877                         edac_device_del_device(dev_info->edac_dev->dev);
 878                         edac_device_free_ctl_info(dev_info->edac_dev);
 879                         platform_device_unregister(dev_info->pdev);
 880                 }
 881
 882                 if (dev_info->exit)
 883                         dev_info->exit(dev_info);
 884
 885                 edac_dbg(0, "Successfully deleted edac device for %s\n",
 886                          dev_info->ctl_name);
 887         }
 888 }
 889
 890 /* Convert current back-ground scrub rate into byte/sec bandwidth */
 891 static int cpc925_get_sdram_scrub_rate(struct mem_ctl_info *mci)
 892 {
 893         struct cpc925_mc_pdata *pdata = mci->pvt_info;
 894         int bw;
 895         u32 mscr;
 896         u8 si;
 897
 898         mscr = __raw_readl(pdata->vbase + REG_MSCR_OFFSET);
 899         si = (mscr & MSCR_SI_MASK) >> MSCR_SI_SHIFT;
 900
 901         edac_dbg(0, "Mem Scrub Ctrl Register 0x%x\n", mscr);
 902
 903         if (((mscr & MSCR_SCRUB_MOD_MASK) != MSCR_BACKGR_SCRUB) ||
 904             (si == 0)) {
 905                 cpc925_mc_printk(mci, KERN_INFO, "Scrub mode not enabled\n");
 906                 bw = 0;
 907         } else
 908                 bw = CPC925_SCRUB_BLOCK_SIZE * 0xFA67 / si;
 909
 910         return bw;
 911 }
 912
 913 /* Return 0 for single channel; 1 for dual channel */
 914 static int cpc925_mc_get_channels(void __iomem *vbase)
 915 {
 916         int dual = 0;
 917         u32 mbcr;
 918
 919         mbcr = __raw_readl(vbase + REG_MBCR_OFFSET);
 920
 921         /*
 922          * Dual channel only when 128-bit wide physical bus
 923          * and 128-bit configuration.
 924          */
 925         if (((mbcr & MBCR_64BITCFG_MASK) == 0) &&
 926             ((mbcr & MBCR_64BITBUS_MASK) == 0))
 927                 dual = 1;
 928
 929         edac_dbg(0, "%s channel\n", (dual > 0) ? "Dual" : "Single");
 930
 931         return dual;
 932 }
 933
 934 static int cpc925_probe(struct platform_device *pdev)
 935 {
 936         static int edac_mc_idx;
 937         struct mem_ctl_info *mci;
 938         struct edac_mc_layer layers[2];
 939         void __iomem *vbase;
 940         struct cpc925_mc_pdata *pdata;
 941         struct resource *r;
 942         int res = 0, nr_channels;
 943
 944         edac_dbg(0, "%s platform device found!\n", pdev->name);
 945
 946         if (!devres_open_group(&pdev->dev, cpc925_probe, GFP_KERNEL)) {
 947                 res = -ENOMEM;
 948                 goto out;
 949         }
 950
 951         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 952         if (!r) {
 953                 cpc925_printk(KERN_ERR, "Unable to get resource\n");
 954                 res = -ENOENT;
 955                 goto err1;
 956         }
 957
 958         if (!devm_request_mem_region(&pdev->dev,
 959                                      r->start,
 960                                      resource_size(r),
 961                                      pdev->name)) {
 962                 cpc925_printk(KERN_ERR, "Unable to request mem region\n");
 963                 res = -EBUSY;
 964                 goto err1;
 965         }
 966
 967         vbase = devm_ioremap(&pdev->dev, r->start, resource_size(r));
 968         if (!vbase) {
 969                 cpc925_printk(KERN_ERR, "Unable to ioremap device\n");
 970                 res = -ENOMEM;
 971                 goto err2;
 972         }
 973
 974         nr_channels = cpc925_mc_get_channels(vbase) + 1;
 975
 976         layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
 977         layers[0].size = CPC925_NR_CSROWS;
 978         layers[0].is_virt_csrow = true;
 979         layers[1].type = EDAC_MC_LAYER_CHANNEL;
 980         layers[1].size = nr_channels;
 981         layers[1].is_virt_csrow = false;
 982         mci = edac_mc_alloc(edac_mc_idx, ARRAY_SIZE(layers), layers,
 983                             sizeof(struct cpc925_mc_pdata));
 984         if (!mci) {
 985                 cpc925_printk(KERN_ERR, "No memory for mem_ctl_info\n");
 986                 res = -ENOMEM;
 987                 goto err2;
 988         }
 989
 990         pdata = mci->pvt_info;
 991         pdata->vbase = vbase;
 992         pdata->edac_idx = edac_mc_idx++;
 993         pdata->name = pdev->name;
 994
 995         mci->pdev = &pdev->dev;
 996         platform_set_drvdata(pdev, mci);
 997         mci->dev_name = dev_name(&pdev->dev);
 998         mci->mtype_cap = MEM_FLAG_RDDR | MEM_FLAG_DDR;
 999         mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
1000         mci->edac_cap = EDAC_FLAG_SECDED;
1001         mci->mod_name = CPC925_EDAC_MOD_STR;
1002         mci->ctl_name = pdev->name;
1003
1004         if (edac_op_state == EDAC_OPSTATE_POLL)
1005                 mci->edac_check = cpc925_mc_check;
1006
1007         mci->ctl_page_to_phys = NULL;
1008         mci->scrub_mode = SCRUB_SW_SRC;
1009         mci->set_sdram_scrub_rate = NULL;
1010         mci->get_sdram_scrub_rate = cpc925_get_sdram_scrub_rate;
1011
1012         cpc925_init_csrows(mci);
1013
1014         /* Setup memory controller registers */
1015         cpc925_mc_init(mci);
1016
1017         if (edac_mc_add_mc(mci) > 0) {
1018                 cpc925_mc_printk(mci, KERN_ERR, "Failed edac_mc_add_mc()\n");
1019                 goto err3;
1020         }
1021
1022         cpc925_add_edac_devices(vbase);
1023
1024         /* get this far and it's successful */
1025         edac_dbg(0, "success\n");
1026
1027         res = 0;
1028         goto out;
1029
1030 err3:
1031         cpc925_mc_exit(mci);
1032         edac_mc_free(mci);
1033 err2:
1034         devm_release_mem_region(&pdev->dev, r->start, resource_size(r));
1035 err1:
1036         devres_release_group(&pdev->dev, cpc925_probe);
1037 out:
1038         return res;
1039 }
1040
1041 static int cpc925_remove(struct platform_device *pdev)
1042 {
1043         struct mem_ctl_info *mci = platform_get_drvdata(pdev);
1044
1045         /*
1046          * Delete common edac devices before edac mc, because
1047          * the former share the MMIO of the latter.
1048          */
1049         cpc925_del_edac_devices();
1050         cpc925_mc_exit(mci);
1051
1052         edac_mc_del_mc(&pdev->dev);
1053         edac_mc_free(mci);
1054
1055         return 0;
1056 }
1057
1058 static struct platform_driver cpc925_edac_driver = {
1059         .probe = cpc925_probe,
1060         .remove = cpc925_remove,
1061         .driver = {
1062                    .name = "cpc925_edac",
1063         }
1064 };
1065
1066 static int __init cpc925_edac_init(void)
1067 {
1068         int ret = 0;
1069
1070         printk(KERN_INFO "IBM CPC925 EDAC driver " CPC925_EDAC_REVISION "\n");
1071         printk(KERN_INFO "\t(c) 2008 Wind River Systems, Inc\n");
1072
1073         /* Only support POLL mode so far */
1074         edac_op_state = EDAC_OPSTATE_POLL;
1075
1076         ret = platform_driver_register(&cpc925_edac_driver);
1077         if (ret) {
1078                 printk(KERN_WARNING "Failed to register %s\n",
1079                         CPC925_EDAC_MOD_STR);
1080         }
1081
1082         return ret;
1083 }
1084
1085 static void __exit cpc925_edac_exit(void)
1086 {
1087         platform_driver_unregister(&cpc925_edac_driver);
1088 }
1089
1090 module_init(cpc925_edac_init);
1091 module_exit(cpc925_edac_exit);
1092
1093 MODULE_LICENSE("GPL");
1094 MODULE_AUTHOR("Cao Qingtao <qingtao.cao@windriver.com>");
1095 MODULE_DESCRIPTION("IBM CPC925 Bridge and MC EDAC kernel module");