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_core.h"
  31 #include "edac_module.h"
  32
  33 #define CPC925_EDAC_REVISION    " Ver: 1.0.0"
  34 #define CPC925_EDAC_MOD_STR     "cpc925_edac"
  35
  36 #define cpc925_printk(level, fmt, arg...) \
  37         edac_printk(level, "CPC925", fmt, ##arg)
  38
  39 #define cpc925_mc_printk(mci, level, fmt, arg...) \
  40         edac_mc_chipset_printk(mci, level, "CPC925", fmt, ##arg)
  41
  42 /*
  43  * CPC925 registers are of 32 bits with bit0 defined at the
  44  * most significant bit and bit31 at that of least significant.
  45  */
  46 #define CPC925_BITS_PER_REG     32
  47 #define CPC925_BIT(nr)          (1UL << (CPC925_BITS_PER_REG - 1 - nr))
  48
  49 /*
  50  * EDAC device names for the error detections of
  51  * CPU Interface and Hypertransport Link.
  52  */
  53 #define CPC925_CPU_ERR_DEV      "cpu"
  54 #define CPC925_HT_LINK_DEV      "htlink"
  55
  56 /* Suppose DDR Refresh cycle is 15.6 microsecond */
  57 #define CPC925_REF_FREQ         0xFA69
  58 #define CPC925_SCRUB_BLOCK_SIZE 64      /* bytes */
  59 #define CPC925_NR_CSROWS        8
  60
  61 /*
  62  * All registers and bits definitions are taken from
  63  * "CPC925 Bridge and Memory Controller User Manual, SA14-2761-02".
  64  */
  65
  66 /*
  67  * CPU and Memory Controller Registers
  68  */
  69 /************************************************************
  70  *      Processor Interface Exception Mask Register (APIMASK)
  71  ************************************************************/
  72 #define REG_APIMASK_OFFSET      0x30070
  73 enum apimask_bits {
  74         APIMASK_DART    = CPC925_BIT(0), /* DART Exception */
  75         APIMASK_ADI0    = CPC925_BIT(1), /* Handshake Error on PI0_ADI */
  76         APIMASK_ADI1    = CPC925_BIT(2), /* Handshake Error on PI1_ADI */
  77         APIMASK_STAT    = CPC925_BIT(3), /* Status Exception */
  78         APIMASK_DERR    = CPC925_BIT(4), /* Data Error Exception */
  79         APIMASK_ADRS0   = CPC925_BIT(5), /* Addressing Exception on PI0 */
  80         APIMASK_ADRS1   = CPC925_BIT(6), /* Addressing Exception on PI1 */
  81                                          /* BIT(7) Reserved */
  82         APIMASK_ECC_UE_H = CPC925_BIT(8), /* UECC upper */
  83         APIMASK_ECC_CE_H = CPC925_BIT(9), /* CECC upper */
  84         APIMASK_ECC_UE_L = CPC925_BIT(10), /* UECC lower */
  85         APIMASK_ECC_CE_L = CPC925_BIT(11), /* CECC lower */
  86
  87         CPU_MASK_ENABLE = (APIMASK_DART | APIMASK_ADI0 | APIMASK_ADI1 |
  88                            APIMASK_STAT | APIMASK_DERR | APIMASK_ADRS0 |
  89                            APIMASK_ADRS1),
  90         ECC_MASK_ENABLE = (APIMASK_ECC_UE_H | APIMASK_ECC_CE_H |
  91                            APIMASK_ECC_UE_L | APIMASK_ECC_CE_L),
  92 };
  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                 debugf1("%s: start 0x%lx, size 0x%lx\n", __func__,
 319                         start, size);
 320                 pdata->total_mem += size;
 321         } while (reg < reg_end);
 322
 323         of_node_put(np);
 324         debugf0("%s: total_mem 0x%lx\n", __func__, pdata->total_mem);
 325 }
 326
 327 static void cpc925_init_csrows(struct mem_ctl_info *mci)
 328 {
 329         struct cpc925_mc_pdata *pdata = mci->pvt_info;
 330         struct csrow_info *csrow;
 331         int index;
 332         u32 mbmr, mbbar, bba;
 333         unsigned long row_size, last_nr_pages = 0;
 334
 335         get_total_mem(pdata);
 336
 337         for (index = 0; index < mci->nr_csrows; index++) {
 338                 mbmr = __raw_readl(pdata->vbase + REG_MBMR_OFFSET +
 339                                    0x20 * index);
 340                 mbbar = __raw_readl(pdata->vbase + REG_MBBAR_OFFSET +
 341                                    0x20 + index);
 342                 bba = (((mbmr & MBMR_BBA_MASK) >> MBMR_BBA_SHIFT) << 8) |
 343                        ((mbbar & MBBAR_BBA_MASK) >> MBBAR_BBA_SHIFT);
 344
 345                 if (bba == 0)
 346                         continue; /* not populated */
 347
 348                 csrow = &mci->csrows[index];
 349
 350                 row_size = bba * (1UL << 28);   /* 256M */
 351                 csrow->first_page = last_nr_pages;
 352                 csrow->nr_pages = row_size >> PAGE_SHIFT;
 353                 csrow->last_page = csrow->first_page + csrow->nr_pages - 1;
 354                 last_nr_pages = csrow->last_page + 1;
 355
 356                 csrow->mtype = MEM_RDDR;
 357                 csrow->edac_mode = EDAC_SECDED;
 358
 359                 switch (csrow->nr_channels) {
 360                 case 1: /* Single channel */
 361                         csrow->grain = 32; /* four-beat burst of 32 bytes */
 362                         break;
 363                 case 2: /* Dual channel */
 364                 default:
 365                         csrow->grain = 64; /* four-beat burst of 64 bytes */
 366                         break;
 367                 }
 368
 369                 switch ((mbmr & MBMR_MODE_MASK) >> MBMR_MODE_SHIFT) {
 370                 case 6: /* 0110, no way to differentiate X8 VS X16 */
 371                 case 5: /* 0101 */
 372                 case 8: /* 1000 */
 373                         csrow->dtype = DEV_X16;
 374                         break;
 375                 case 7: /* 0111 */
 376                 case 9: /* 1001 */
 377                         csrow->dtype = DEV_X8;
 378                         break;
 379                 default:
 380                         csrow->dtype = DEV_UNKNOWN;
 381                         break;
 382                 }
 383         }
 384 }
 385
 386 /* Enable memory controller ECC detection */
 387 static void cpc925_mc_init(struct mem_ctl_info *mci)
 388 {
 389         struct cpc925_mc_pdata *pdata = mci->pvt_info;
 390         u32 apimask;
 391         u32 mccr;
 392
 393         /* Enable various ECC error exceptions */
 394         apimask = __raw_readl(pdata->vbase + REG_APIMASK_OFFSET);
 395         if ((apimask & ECC_MASK_ENABLE) == 0) {
 396                 apimask |= ECC_MASK_ENABLE;
 397                 __raw_writel(apimask, pdata->vbase + REG_APIMASK_OFFSET);
 398         }
 399
 400         /* Enable ECC detection */
 401         mccr = __raw_readl(pdata->vbase + REG_MCCR_OFFSET);
 402         if ((mccr & MCCR_ECC_EN) == 0) {
 403                 mccr |= MCCR_ECC_EN;
 404                 __raw_writel(mccr, pdata->vbase + REG_MCCR_OFFSET);
 405         }
 406 }
 407
 408 /* Disable memory controller ECC detection */
 409 static void cpc925_mc_exit(struct mem_ctl_info *mci)
 410 {
 411         /*
 412          * WARNING:
 413          * We are supposed to clear the ECC error detection bits,
 414          * and it will be no problem to do so. However, once they
 415          * are cleared here if we want to re-install CPC925 EDAC
 416          * module later, setting them up in cpc925_mc_init() will
 417          * trigger machine check exception.
 418          * Also, it's ok to leave ECC error detection bits enabled,
 419          * since they are reset to 1 by default or by boot loader.
 420          */
 421
 422         return;
 423 }
 424
 425 /*
 426  * Revert DDR column/row/bank addresses into page frame number and
 427  * offset in page.
 428  *
 429  * Suppose memory mode is 0x0111(128-bit mode, identical DIMM pairs),
 430  * physical address(PA) bits to column address(CA) bits mappings are:
 431  * CA   0   1   2   3   4   5   6   7   8   9   10
 432  * PA   59  58  57  56  55  54  53  52  51  50  49
 433  *
 434  * physical address(PA) bits to bank address(BA) bits mappings are:
 435  * BA   0   1
 436  * PA   43  44
 437  *
 438  * physical address(PA) bits to row address(RA) bits mappings are:
 439  * RA   0   1   2   3   4   5   6   7   8   9   10   11   12
 440  * PA   36  35  34  48  47  46  45  40  41  42  39   38   37
 441  */
 442 static void cpc925_mc_get_pfn(struct mem_ctl_info *mci, u32 mear,
 443                 unsigned long *pfn, unsigned long *offset, int *csrow)
 444 {
 445         u32 bcnt, rank, col, bank, row;
 446         u32 c;
 447         unsigned long pa;
 448         int i;
 449
 450         bcnt = (mear & MEAR_BCNT_MASK) >> MEAR_BCNT_SHIFT;
 451         rank = (mear & MEAR_RANK_MASK) >> MEAR_RANK_SHIFT;
 452         col = (mear & MEAR_COL_MASK) >> MEAR_COL_SHIFT;
 453         bank = (mear & MEAR_BANK_MASK) >> MEAR_BANK_SHIFT;
 454         row = mear & MEAR_ROW_MASK;
 455
 456         *csrow = rank;
 457
 458 #ifdef CONFIG_EDAC_DEBUG
 459         if (mci->csrows[rank].first_page == 0) {
 460                 cpc925_mc_printk(mci, KERN_ERR, "ECC occurs in a "
 461                         "non-populated csrow, broken hardware?\n");
 462                 return;
 463         }
 464 #endif
 465
 466         /* Revert csrow number */
 467         pa = mci->csrows[rank].first_page << PAGE_SHIFT;
 468
 469         /* Revert column address */
 470         col += bcnt;
 471         for (i = 0; i < 11; i++) {
 472                 c = col & 0x1;
 473                 col >>= 1;
 474                 pa |= c << (14 - i);
 475         }
 476
 477         /* Revert bank address */
 478         pa |= bank << 19;
 479
 480         /* Revert row address, in 4 steps */
 481         for (i = 0; i < 3; i++) {
 482                 c = row & 0x1;
 483                 row >>= 1;
 484                 pa |= c << (26 - i);
 485         }
 486
 487         for (i = 0; i < 3; i++) {
 488                 c = row & 0x1;
 489                 row >>= 1;
 490                 pa |= c << (21 + i);
 491         }
 492
 493         for (i = 0; i < 4; i++) {
 494                 c = row & 0x1;
 495                 row >>= 1;
 496                 pa |= c << (18 - i);
 497         }
 498
 499         for (i = 0; i < 3; i++) {
 500                 c = row & 0x1;
 501                 row >>= 1;
 502                 pa |= c << (29 - i);
 503         }
 504
 505         *offset = pa & (PAGE_SIZE - 1);
 506         *pfn = pa >> PAGE_SHIFT;
 507
 508         debugf0("%s: ECC physical address 0x%lx\n", __func__, pa);
 509 }
 510
 511 static int cpc925_mc_find_channel(struct mem_ctl_info *mci, u16 syndrome)
 512 {
 513         if ((syndrome & MESR_ECC_SYN_H_MASK) == 0)
 514                 return 0;
 515
 516         if ((syndrome & MESR_ECC_SYN_L_MASK) == 0)
 517                 return 1;
 518
 519         cpc925_mc_printk(mci, KERN_INFO, "Unexpected syndrome value: 0x%x\n",
 520                          syndrome);
 521         return 1;
 522 }
 523
 524 /* Check memory controller registers for ECC errors */
 525 static void cpc925_mc_check(struct mem_ctl_info *mci)
 526 {
 527         struct cpc925_mc_pdata *pdata = mci->pvt_info;
 528         u32 apiexcp;
 529         u32 mear;
 530         u32 mesr;
 531         u16 syndrome;
 532         unsigned long pfn = 0, offset = 0;
 533         int csrow = 0, channel = 0;
 534
 535         /* APIEXCP is cleared when read */
 536         apiexcp = __raw_readl(pdata->vbase + REG_APIEXCP_OFFSET);
 537         if ((apiexcp & ECC_EXCP_DETECTED) == 0)
 538                 return;
 539
 540         mesr = __raw_readl(pdata->vbase + REG_MESR_OFFSET);
 541         syndrome = mesr | (MESR_ECC_SYN_H_MASK | MESR_ECC_SYN_L_MASK);
 542
 543         mear = __raw_readl(pdata->vbase + REG_MEAR_OFFSET);
 544
 545         /* Revert column/row addresses into page frame number, etc */
 546         cpc925_mc_get_pfn(mci, mear, &pfn, &offset, &csrow);
 547
 548         if (apiexcp & CECC_EXCP_DETECTED) {
 549                 cpc925_mc_printk(mci, KERN_INFO, "DRAM CECC Fault\n");
 550                 channel = cpc925_mc_find_channel(mci, syndrome);
 551                 edac_mc_handle_ce(mci, pfn, offset, syndrome,
 552                                   csrow, channel, mci->ctl_name);
 553         }
 554
 555         if (apiexcp & UECC_EXCP_DETECTED) {
 556                 cpc925_mc_printk(mci, KERN_INFO, "DRAM UECC Fault\n");
 557                 edac_mc_handle_ue(mci, pfn, offset, csrow, mci->ctl_name);
 558         }
 559
 560         cpc925_mc_printk(mci, KERN_INFO, "Dump registers:\n");
 561         cpc925_mc_printk(mci, KERN_INFO, "APIMASK               0x%08x\n",
 562                 __raw_readl(pdata->vbase + REG_APIMASK_OFFSET));
 563         cpc925_mc_printk(mci, KERN_INFO, "APIEXCP               0x%08x\n",
 564                 apiexcp);
 565         cpc925_mc_printk(mci, KERN_INFO, "Mem Scrub Ctrl        0x%08x\n",
 566                 __raw_readl(pdata->vbase + REG_MSCR_OFFSET));
 567         cpc925_mc_printk(mci, KERN_INFO, "Mem Scrub Rge Start   0x%08x\n",
 568                 __raw_readl(pdata->vbase + REG_MSRSR_OFFSET));
 569         cpc925_mc_printk(mci, KERN_INFO, "Mem Scrub Rge End     0x%08x\n",
 570                 __raw_readl(pdata->vbase + REG_MSRER_OFFSET));
 571         cpc925_mc_printk(mci, KERN_INFO, "Mem Scrub Pattern     0x%08x\n",
 572                 __raw_readl(pdata->vbase + REG_MSPR_OFFSET));
 573         cpc925_mc_printk(mci, KERN_INFO, "Mem Chk Ctrl          0x%08x\n",
 574                 __raw_readl(pdata->vbase + REG_MCCR_OFFSET));
 575         cpc925_mc_printk(mci, KERN_INFO, "Mem Chk Rge End       0x%08x\n",
 576                 __raw_readl(pdata->vbase + REG_MCRER_OFFSET));
 577         cpc925_mc_printk(mci, KERN_INFO, "Mem Err Address       0x%08x\n",
 578                 mesr);
 579         cpc925_mc_printk(mci, KERN_INFO, "Mem Err Syndrome      0x%08x\n",
 580                 syndrome);
 581 }
 582
 583 /******************** CPU err device********************************/
 584 /* Enable CPU Errors detection */
 585 static void cpc925_cpu_init(struct cpc925_dev_info *dev_info)
 586 {
 587         u32 apimask;
 588
 589         apimask = __raw_readl(dev_info->vbase + REG_APIMASK_OFFSET);
 590         if ((apimask & CPU_MASK_ENABLE) == 0) {
 591                 apimask |= CPU_MASK_ENABLE;
 592                 __raw_writel(apimask, dev_info->vbase + REG_APIMASK_OFFSET);
 593         }
 594 }
 595
 596 /* Disable CPU Errors detection */
 597 static void cpc925_cpu_exit(struct cpc925_dev_info *dev_info)
 598 {
 599         /*
 600          * WARNING:
 601          * We are supposed to clear the CPU error detection bits,
 602          * and it will be no problem to do so. However, once they
 603          * are cleared here if we want to re-install CPC925 EDAC
 604          * module later, setting them up in cpc925_cpu_init() will
 605          * trigger machine check exception.
 606          * Also, it's ok to leave CPU error detection bits enabled,
 607          * since they are reset to 1 by default.
 608          */
 609
 610         return;
 611 }
 612
 613 /* Check for CPU Errors */
 614 static void cpc925_cpu_check(struct edac_device_ctl_info *edac_dev)
 615 {
 616         struct cpc925_dev_info *dev_info = edac_dev->pvt_info;
 617         u32 apiexcp;
 618         u32 apimask;
 619
 620         /* APIEXCP is cleared when read */
 621         apiexcp = __raw_readl(dev_info->vbase + REG_APIEXCP_OFFSET);
 622         if ((apiexcp & CPU_EXCP_DETECTED) == 0)
 623                 return;
 624
 625         apimask = __raw_readl(dev_info->vbase + REG_APIMASK_OFFSET);
 626         cpc925_printk(KERN_INFO, "Processor Interface Fault\n"
 627                                  "Processor Interface register dump:\n");
 628         cpc925_printk(KERN_INFO, "APIMASK               0x%08x\n", apimask);
 629         cpc925_printk(KERN_INFO, "APIEXCP               0x%08x\n", apiexcp);
 630
 631         edac_device_handle_ue(edac_dev, 0, 0, edac_dev->ctl_name);
 632 }
 633
 634 /******************** HT Link err device****************************/
 635 /* Enable HyperTransport Link Error detection */
 636 static void cpc925_htlink_init(struct cpc925_dev_info *dev_info)
 637 {
 638         u32 ht_errctrl;
 639
 640         ht_errctrl = __raw_readl(dev_info->vbase + REG_ERRCTRL_OFFSET);
 641         if ((ht_errctrl & HT_ERRCTRL_ENABLE) == 0) {
 642                 ht_errctrl |= HT_ERRCTRL_ENABLE;
 643                 __raw_writel(ht_errctrl, dev_info->vbase + REG_ERRCTRL_OFFSET);
 644         }
 645 }
 646
 647 /* Disable HyperTransport Link Error detection */
 648 static void cpc925_htlink_exit(struct cpc925_dev_info *dev_info)
 649 {
 650         u32 ht_errctrl;
 651
 652         ht_errctrl = __raw_readl(dev_info->vbase + REG_ERRCTRL_OFFSET);
 653         ht_errctrl &= ~HT_ERRCTRL_ENABLE;
 654         __raw_writel(ht_errctrl, dev_info->vbase + REG_ERRCTRL_OFFSET);
 655 }
 656
 657 /* Check for HyperTransport Link errors */
 658 static void cpc925_htlink_check(struct edac_device_ctl_info *edac_dev)
 659 {
 660         struct cpc925_dev_info *dev_info = edac_dev->pvt_info;
 661         u32 brgctrl = __raw_readl(dev_info->vbase + REG_BRGCTRL_OFFSET);
 662         u32 linkctrl = __raw_readl(dev_info->vbase + REG_LINKCTRL_OFFSET);
 663         u32 errctrl = __raw_readl(dev_info->vbase + REG_ERRCTRL_OFFSET);
 664         u32 linkerr = __raw_readl(dev_info->vbase + REG_LINKERR_OFFSET);
 665
 666         if (!((brgctrl & BRGCTRL_DETSERR) ||
 667               (linkctrl & HT_LINKCTRL_DETECTED) ||
 668               (errctrl & HT_ERRCTRL_DETECTED) ||
 669               (linkerr & HT_LINKERR_DETECTED)))
 670                 return;
 671
 672         cpc925_printk(KERN_INFO, "HT Link Fault\n"
 673                                  "HT register dump:\n");
 674         cpc925_printk(KERN_INFO, "Bridge Ctrl                   0x%08x\n",
 675                       brgctrl);
 676         cpc925_printk(KERN_INFO, "Link Config Ctrl              0x%08x\n",
 677                       linkctrl);
 678         cpc925_printk(KERN_INFO, "Error Enum and Ctrl           0x%08x\n",
 679                       errctrl);
 680         cpc925_printk(KERN_INFO, "Link Error                    0x%08x\n",
 681                       linkerr);
 682
 683         /* Clear by write 1 */
 684         if (brgctrl & BRGCTRL_DETSERR)
 685                 __raw_writel(BRGCTRL_DETSERR,
 686                                 dev_info->vbase + REG_BRGCTRL_OFFSET);
 687
 688         if (linkctrl & HT_LINKCTRL_DETECTED)
 689                 __raw_writel(HT_LINKCTRL_DETECTED,
 690                                 dev_info->vbase + REG_LINKCTRL_OFFSET);
 691
 692         /* Initiate Secondary Bus Reset to clear the chain failure */
 693         if (errctrl & ERRCTRL_CHN_FAL)
 694                 __raw_writel(BRGCTRL_SECBUSRESET,
 695                                 dev_info->vbase + REG_BRGCTRL_OFFSET);
 696
 697         if (errctrl & ERRCTRL_RSP_ERR)
 698                 __raw_writel(ERRCTRL_RSP_ERR,
 699                                 dev_info->vbase + REG_ERRCTRL_OFFSET);
 700
 701         if (linkerr & HT_LINKERR_DETECTED)
 702                 __raw_writel(HT_LINKERR_DETECTED,
 703                                 dev_info->vbase + REG_LINKERR_OFFSET);
 704
 705         edac_device_handle_ce(edac_dev, 0, 0, edac_dev->ctl_name);
 706 }
 707
 708 static struct cpc925_dev_info cpc925_devs[] = {
 709         {
 710         .ctl_name = CPC925_CPU_ERR_DEV,
 711         .init = cpc925_cpu_init,
 712         .exit = cpc925_cpu_exit,
 713         .check = cpc925_cpu_check,
 714         },
 715         {
 716         .ctl_name = CPC925_HT_LINK_DEV,
 717         .init = cpc925_htlink_init,
 718         .exit = cpc925_htlink_exit,
 719         .check = cpc925_htlink_check,
 720         },
 721         {0}, /* Terminated by NULL */
 722 };
 723
 724 /*
 725  * Add CPU Err detection and HyperTransport Link Err detection
 726  * as common "edac_device", they have no corresponding device
 727  * nodes in the Open Firmware DTB and we have to add platform
 728  * devices for them. Also, they will share the MMIO with that
 729  * of memory controller.
 730  */
 731 static void cpc925_add_edac_devices(void __iomem *vbase)
 732 {
 733         struct cpc925_dev_info *dev_info;
 734
 735         if (!vbase) {
 736                 cpc925_printk(KERN_ERR, "MMIO not established yet\n");
 737                 return;
 738         }
 739
 740         for (dev_info = &cpc925_devs[0]; dev_info->init; dev_info++) {
 741                 dev_info->vbase = vbase;
 742                 dev_info->pdev = platform_device_register_simple(
 743                                         dev_info->ctl_name, 0, NULL, 0);
 744                 if (IS_ERR(dev_info->pdev)) {
 745                         cpc925_printk(KERN_ERR,
 746                                 "Can't register platform device for %s\n",
 747                                 dev_info->ctl_name);
 748                         continue;
 749                 }
 750
 751                 /*
 752                  * Don't have to allocate private structure but
 753                  * make use of cpc925_devs[] instead.
 754                  */
 755                 dev_info->edac_idx = edac_device_alloc_index();
 756                 dev_info->edac_dev =
 757                         edac_device_alloc_ctl_info(0, dev_info->ctl_name,
 758                                 1, NULL, 0, 0, NULL, 0, dev_info->edac_idx);
 759                 if (!dev_info->edac_dev) {
 760                         cpc925_printk(KERN_ERR, "No memory for edac device\n");
 761                         goto err1;
 762                 }
 763
 764                 dev_info->edac_dev->pvt_info = dev_info;
 765                 dev_info->edac_dev->dev = &dev_info->pdev->dev;
 766                 dev_info->edac_dev->ctl_name = dev_info->ctl_name;
 767                 dev_info->edac_dev->mod_name = CPC925_EDAC_MOD_STR;
 768                 dev_info->edac_dev->dev_name = dev_name(&dev_info->pdev->dev);
 769
 770                 if (edac_op_state == EDAC_OPSTATE_POLL)
 771                         dev_info->edac_dev->edac_check = dev_info->check;
 772
 773                 if (dev_info->init)
 774                         dev_info->init(dev_info);
 775
 776                 if (edac_device_add_device(dev_info->edac_dev) > 0) {
 777                         cpc925_printk(KERN_ERR,
 778                                 "Unable to add edac device for %s\n",
 779                                 dev_info->ctl_name);
 780                         goto err2;
 781                 }
 782
 783                 debugf0("%s: Successfully added edac device for %s\n",
 784                         __func__, dev_info->ctl_name);
 785
 786                 continue;
 787
 788 err2:
 789                 if (dev_info->exit)
 790                         dev_info->exit(dev_info);
 791                 edac_device_free_ctl_info(dev_info->edac_dev);
 792 err1:
 793                 platform_device_unregister(dev_info->pdev);
 794         }
 795 }
 796
 797 /*
 798  * Delete the common "edac_device" for CPU Err Detection
 799  * and HyperTransport Link Err Detection
 800  */
 801 static void cpc925_del_edac_devices(void)
 802 {
 803         struct cpc925_dev_info *dev_info;
 804
 805         for (dev_info = &cpc925_devs[0]; dev_info->init; dev_info++) {
 806                 if (dev_info->edac_dev) {
 807                         edac_device_del_device(dev_info->edac_dev->dev);
 808                         edac_device_free_ctl_info(dev_info->edac_dev);
 809                         platform_device_unregister(dev_info->pdev);
 810                 }
 811
 812                 if (dev_info->exit)
 813                         dev_info->exit(dev_info);
 814
 815                 debugf0("%s: Successfully deleted edac device for %s\n",
 816                         __func__, dev_info->ctl_name);
 817         }
 818 }
 819
 820 /* Convert current back-ground scrub rate into byte/sec bandwidth */
 821 static int cpc925_get_sdram_scrub_rate(struct mem_ctl_info *mci)
 822 {
 823         struct cpc925_mc_pdata *pdata = mci->pvt_info;
 824         int bw;
 825         u32 mscr;
 826         u8 si;
 827
 828         mscr = __raw_readl(pdata->vbase + REG_MSCR_OFFSET);
 829         si = (mscr & MSCR_SI_MASK) >> MSCR_SI_SHIFT;
 830
 831         debugf0("%s, Mem Scrub Ctrl Register 0x%x\n", __func__, mscr);
 832
 833         if (((mscr & MSCR_SCRUB_MOD_MASK) != MSCR_BACKGR_SCRUB) ||
 834             (si == 0)) {
 835                 cpc925_mc_printk(mci, KERN_INFO, "Scrub mode not enabled\n");
 836                 bw = 0;
 837         } else
 838                 bw = CPC925_SCRUB_BLOCK_SIZE * 0xFA67 / si;
 839
 840         return bw;
 841 }
 842
 843 /* Return 0 for single channel; 1 for dual channel */
 844 static int cpc925_mc_get_channels(void __iomem *vbase)
 845 {
 846         int dual = 0;
 847         u32 mbcr;
 848
 849         mbcr = __raw_readl(vbase + REG_MBCR_OFFSET);
 850
 851         /*
 852          * Dual channel only when 128-bit wide physical bus
 853          * and 128-bit configuration.
 854          */
 855         if (((mbcr & MBCR_64BITCFG_MASK) == 0) &&
 856             ((mbcr & MBCR_64BITBUS_MASK) == 0))
 857                 dual = 1;
 858
 859         debugf0("%s: %s channel\n", __func__,
 860                 (dual > 0) ? "Dual" : "Single");
 861
 862         return dual;
 863 }
 864
 865 static int __devinit cpc925_probe(struct platform_device *pdev)
 866 {
 867         static int edac_mc_idx;
 868         struct mem_ctl_info *mci;
 869         void __iomem *vbase;
 870         struct cpc925_mc_pdata *pdata;
 871         struct resource *r;
 872         int res = 0, nr_channels;
 873
 874         debugf0("%s: %s platform device found!\n", __func__, pdev->name);
 875
 876         if (!devres_open_group(&pdev->dev, cpc925_probe, GFP_KERNEL)) {
 877                 res = -ENOMEM;
 878                 goto out;
 879         }
 880
 881         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 882         if (!r) {
 883                 cpc925_printk(KERN_ERR, "Unable to get resource\n");
 884                 res = -ENOENT;
 885                 goto err1;
 886         }
 887
 888         if (!devm_request_mem_region(&pdev->dev,
 889                                      r->start,
 890                                      resource_size(r),
 891                                      pdev->name)) {
 892                 cpc925_printk(KERN_ERR, "Unable to request mem region\n");
 893                 res = -EBUSY;
 894                 goto err1;
 895         }
 896
 897         vbase = devm_ioremap(&pdev->dev, r->start, resource_size(r));
 898         if (!vbase) {
 899                 cpc925_printk(KERN_ERR, "Unable to ioremap device\n");
 900                 res = -ENOMEM;
 901                 goto err2;
 902         }
 903
 904         nr_channels = cpc925_mc_get_channels(vbase);
 905         mci = edac_mc_alloc(sizeof(struct cpc925_mc_pdata),
 906                         CPC925_NR_CSROWS, nr_channels + 1, edac_mc_idx);
 907         if (!mci) {
 908                 cpc925_printk(KERN_ERR, "No memory for mem_ctl_info\n");
 909                 res = -ENOMEM;
 910                 goto err2;
 911         }
 912
 913         pdata = mci->pvt_info;
 914         pdata->vbase = vbase;
 915         pdata->edac_idx = edac_mc_idx++;
 916         pdata->name = pdev->name;
 917
 918         mci->dev = &pdev->dev;
 919         platform_set_drvdata(pdev, mci);
 920         mci->dev_name = dev_name(&pdev->dev);
 921         mci->mtype_cap = MEM_FLAG_RDDR | MEM_FLAG_DDR;
 922         mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
 923         mci->edac_cap = EDAC_FLAG_SECDED;
 924         mci->mod_name = CPC925_EDAC_MOD_STR;
 925         mci->mod_ver = CPC925_EDAC_REVISION;
 926         mci->ctl_name = pdev->name;
 927
 928         if (edac_op_state == EDAC_OPSTATE_POLL)
 929                 mci->edac_check = cpc925_mc_check;
 930
 931         mci->ctl_page_to_phys = NULL;
 932         mci->scrub_mode = SCRUB_SW_SRC;
 933         mci->set_sdram_scrub_rate = NULL;
 934         mci->get_sdram_scrub_rate = cpc925_get_sdram_scrub_rate;
 935
 936         cpc925_init_csrows(mci);
 937
 938         /* Setup memory controller registers */
 939         cpc925_mc_init(mci);
 940
 941         if (edac_mc_add_mc(mci) > 0) {
 942                 cpc925_mc_printk(mci, KERN_ERR, "Failed edac_mc_add_mc()\n");
 943                 goto err3;
 944         }
 945
 946         cpc925_add_edac_devices(vbase);
 947
 948         /* get this far and it's successful */
 949         debugf0("%s: success\n", __func__);
 950
 951         res = 0;
 952         goto out;
 953
 954 err3:
 955         cpc925_mc_exit(mci);
 956         edac_mc_free(mci);
 957 err2:
 958         devm_release_mem_region(&pdev->dev, r->start, resource_size(r));
 959 err1:
 960         devres_release_group(&pdev->dev, cpc925_probe);
 961 out:
 962         return res;
 963 }
 964
 965 static int cpc925_remove(struct platform_device *pdev)
 966 {
 967         struct mem_ctl_info *mci = platform_get_drvdata(pdev);
 968
 969         /*
 970          * Delete common edac devices before edac mc, because
 971          * the former share the MMIO of the latter.
 972          */
 973         cpc925_del_edac_devices();
 974         cpc925_mc_exit(mci);
 975
 976         edac_mc_del_mc(&pdev->dev);
 977         edac_mc_free(mci);
 978
 979         return 0;
 980 }
 981
 982 static struct platform_driver cpc925_edac_driver = {
 983         .probe = cpc925_probe,
 984         .remove = cpc925_remove,
 985         .driver = {
 986                    .name = "cpc925_edac",
 987         }
 988 };
 989
 990 static int __init cpc925_edac_init(void)
 991 {
 992         int ret = 0;
 993
 994         printk(KERN_INFO "IBM CPC925 EDAC driver " CPC925_EDAC_REVISION "\n");
 995         printk(KERN_INFO "\t(c) 2008 Wind River Systems, Inc\n");
 996
 997         /* Only support POLL mode so far */
 998         edac_op_state = EDAC_OPSTATE_POLL;
 999
1000         ret = platform_driver_register(&cpc925_edac_driver);
1001         if (ret) {
1002                 printk(KERN_WARNING "Failed to register %s\n",
1003                         CPC925_EDAC_MOD_STR);
1004         }
1005
1006         return ret;
1007 }
1008
1009 static void __exit cpc925_edac_exit(void)
1010 {
1011         platform_driver_unregister(&cpc925_edac_driver);
1012 }
1013
1014 module_init(cpc925_edac_init);
1015 module_exit(cpc925_edac_exit);
1016
1017 MODULE_LICENSE("GPL");
1018 MODULE_AUTHOR("Cao Qingtao <qingtao.cao@windriver.com>");
1019 MODULE_DESCRIPTION("IBM CPC925 Bridge and MC EDAC kernel module");