drivers/edac/armada_xp_edac.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2017 Pengutronix, Jan Luebbe <kernel@pengutronix.de>
   4  */
   5
   6 #include <linux/kernel.h>
   7 #include <linux/edac.h>
   8 #include <linux/of_platform.h>
   9
  10 #include <asm/hardware/cache-l2x0.h>
  11 #include <asm/hardware/cache-aurora-l2.h>
  12
  13 #include "edac_mc.h"
  14 #include "edac_device.h"
  15 #include "edac_module.h"
  16
  17 /************************ EDAC MC (DDR RAM) ********************************/
  18
  19 #define SDRAM_NUM_CS 4
  20
  21 #define SDRAM_CONFIG_REG        0x0
  22 #define SDRAM_CONFIG_ECC_MASK         BIT(18)
  23 #define SDRAM_CONFIG_REGISTERED_MASK  BIT(17)
  24 #define SDRAM_CONFIG_BUS_WIDTH_MASK   BIT(15)
  25
  26 #define SDRAM_ADDR_CTRL_REG     0x10
  27 #define SDRAM_ADDR_CTRL_SIZE_HIGH_OFFSET(cs) (20+cs)
  28 #define SDRAM_ADDR_CTRL_SIZE_HIGH_MASK(cs)   (0x1 << SDRAM_ADDR_CTRL_SIZE_HIGH_OFFSET(cs))
  29 #define SDRAM_ADDR_CTRL_ADDR_SEL_MASK(cs)    BIT(16+cs)
  30 #define SDRAM_ADDR_CTRL_SIZE_LOW_OFFSET(cs)  (cs*4+2)
  31 #define SDRAM_ADDR_CTRL_SIZE_LOW_MASK(cs)    (0x3 << SDRAM_ADDR_CTRL_SIZE_LOW_OFFSET(cs))
  32 #define SDRAM_ADDR_CTRL_STRUCT_OFFSET(cs)    (cs*4)
  33 #define SDRAM_ADDR_CTRL_STRUCT_MASK(cs)      (0x3 << SDRAM_ADDR_CTRL_STRUCT_OFFSET(cs))
  34
  35 #define SDRAM_ERR_DATA_H_REG    0x40
  36 #define SDRAM_ERR_DATA_L_REG    0x44
  37
  38 #define SDRAM_ERR_RECV_ECC_REG  0x48
  39 #define SDRAM_ERR_RECV_ECC_VALUE_MASK 0xff
  40
  41 #define SDRAM_ERR_CALC_ECC_REG  0x4c
  42 #define SDRAM_ERR_CALC_ECC_ROW_OFFSET 8
  43 #define SDRAM_ERR_CALC_ECC_ROW_MASK   (0xffff << SDRAM_ERR_CALC_ECC_ROW_OFFSET)
  44 #define SDRAM_ERR_CALC_ECC_VALUE_MASK 0xff
  45
  46 #define SDRAM_ERR_ADDR_REG      0x50
  47 #define SDRAM_ERR_ADDR_BANK_OFFSET    23
  48 #define SDRAM_ERR_ADDR_BANK_MASK      (0x7 << SDRAM_ERR_ADDR_BANK_OFFSET)
  49 #define SDRAM_ERR_ADDR_COL_OFFSET     8
  50 #define SDRAM_ERR_ADDR_COL_MASK       (0x7fff << SDRAM_ERR_ADDR_COL_OFFSET)
  51 #define SDRAM_ERR_ADDR_CS_OFFSET      1
  52 #define SDRAM_ERR_ADDR_CS_MASK        (0x3 << SDRAM_ERR_ADDR_CS_OFFSET)
  53 #define SDRAM_ERR_ADDR_TYPE_MASK      BIT(0)
  54
  55 #define SDRAM_ERR_CTRL_REG      0x54
  56 #define SDRAM_ERR_CTRL_THR_OFFSET     16
  57 #define SDRAM_ERR_CTRL_THR_MASK       (0xff << SDRAM_ERR_CTRL_THR_OFFSET)
  58 #define SDRAM_ERR_CTRL_PROP_MASK      BIT(9)
  59
  60 #define SDRAM_ERR_SBE_COUNT_REG 0x58
  61 #define SDRAM_ERR_DBE_COUNT_REG 0x5c
  62
  63 #define SDRAM_ERR_CAUSE_ERR_REG 0xd0
  64 #define SDRAM_ERR_CAUSE_MSG_REG 0xd8
  65 #define SDRAM_ERR_CAUSE_DBE_MASK      BIT(1)
  66 #define SDRAM_ERR_CAUSE_SBE_MASK      BIT(0)
  67
  68 #define SDRAM_RANK_CTRL_REG 0x1e0
  69 #define SDRAM_RANK_CTRL_EXIST_MASK(cs) BIT(cs)
  70
  71 struct axp_mc_drvdata {
  72         void __iomem *base;
  73         /* width in bytes */
  74         unsigned int width;
  75         /* bank interleaving */
  76         bool cs_addr_sel[SDRAM_NUM_CS];
  77
  78         char msg[128];
  79 };
  80
  81 /* derived from "DRAM Address Multiplexing" in the ARMADA XP Functional Spec */
  82 static uint32_t axp_mc_calc_address(struct axp_mc_drvdata *drvdata,
  83                                     uint8_t cs, uint8_t bank, uint16_t row,
  84                                     uint16_t col)
  85 {
  86         if (drvdata->width == 8) {
  87                 /* 64 bit */
  88                 if (drvdata->cs_addr_sel[cs])
  89                         /* bank interleaved */
  90                         return (((row & 0xfff8) << 16) |
  91                                 ((bank & 0x7) << 16) |
  92                                 ((row & 0x7) << 13) |
  93                                 ((col & 0x3ff) << 3));
  94                 else
  95                         return (((row & 0xffff << 16) |
  96                                  ((bank & 0x7) << 13) |
  97                                  ((col & 0x3ff)) << 3));
  98         } else if (drvdata->width == 4) {
  99                 /* 32 bit */
 100                 if (drvdata->cs_addr_sel[cs])
 101                         /* bank interleaved */
 102                         return (((row & 0xfff0) << 15) |
 103                                 ((bank & 0x7) << 16) |
 104                                 ((row & 0xf) << 12) |
 105                                 ((col & 0x3ff) << 2));
 106                 else
 107                         return (((row & 0xffff << 15) |
 108                                  ((bank & 0x7) << 12) |
 109                                  ((col & 0x3ff)) << 2));
 110         } else {
 111                 /* 16 bit */
 112                 if (drvdata->cs_addr_sel[cs])
 113                         /* bank interleaved */
 114                         return (((row & 0xffe0) << 14) |
 115                                 ((bank & 0x7) << 16) |
 116                                 ((row & 0x1f) << 11) |
 117                                 ((col & 0x3ff) << 1));
 118                 else
 119                         return (((row & 0xffff << 14) |
 120                                  ((bank & 0x7) << 11) |
 121                                  ((col & 0x3ff)) << 1));
 122         }
 123 }
 124
 125 static void axp_mc_check(struct mem_ctl_info *mci)
 126 {
 127         struct axp_mc_drvdata *drvdata = mci->pvt_info;
 128         uint32_t data_h, data_l, recv_ecc, calc_ecc, addr;
 129         uint32_t cnt_sbe, cnt_dbe, cause_err, cause_msg;
 130         uint32_t row_val, col_val, bank_val, addr_val;
 131         uint8_t syndrome_val, cs_val;
 132         char *msg = drvdata->msg;
 133
 134         data_h    = readl(drvdata->base + SDRAM_ERR_DATA_H_REG);
 135         data_l    = readl(drvdata->base + SDRAM_ERR_DATA_L_REG);
 136         recv_ecc  = readl(drvdata->base + SDRAM_ERR_RECV_ECC_REG);
 137         calc_ecc  = readl(drvdata->base + SDRAM_ERR_CALC_ECC_REG);
 138         addr      = readl(drvdata->base + SDRAM_ERR_ADDR_REG);
 139         cnt_sbe   = readl(drvdata->base + SDRAM_ERR_SBE_COUNT_REG);
 140         cnt_dbe   = readl(drvdata->base + SDRAM_ERR_DBE_COUNT_REG);
 141         cause_err = readl(drvdata->base + SDRAM_ERR_CAUSE_ERR_REG);
 142         cause_msg = readl(drvdata->base + SDRAM_ERR_CAUSE_MSG_REG);
 143
 144         /* clear cause registers */
 145         writel(~(SDRAM_ERR_CAUSE_DBE_MASK | SDRAM_ERR_CAUSE_SBE_MASK),
 146                drvdata->base + SDRAM_ERR_CAUSE_ERR_REG);
 147         writel(~(SDRAM_ERR_CAUSE_DBE_MASK | SDRAM_ERR_CAUSE_SBE_MASK),
 148                drvdata->base + SDRAM_ERR_CAUSE_MSG_REG);
 149
 150         /* clear error counter registers */
 151         if (cnt_sbe)
 152                 writel(0, drvdata->base + SDRAM_ERR_SBE_COUNT_REG);
 153         if (cnt_dbe)
 154                 writel(0, drvdata->base + SDRAM_ERR_DBE_COUNT_REG);
 155
 156         if (!cnt_sbe && !cnt_dbe)
 157                 return;
 158
 159         if (!(addr & SDRAM_ERR_ADDR_TYPE_MASK)) {
 160                 if (cnt_sbe)
 161                         cnt_sbe--;
 162                 else
 163                         dev_warn(mci->pdev, "inconsistent SBE count detected\n");
 164         } else {
 165                 if (cnt_dbe)
 166                         cnt_dbe--;
 167                 else
 168                         dev_warn(mci->pdev, "inconsistent DBE count detected\n");
 169         }
 170
 171         /* report earlier errors */
 172         if (cnt_sbe)
 173                 edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci,
 174                                      cnt_sbe, /* error count */
 175                                      0, 0, 0, /* pfn, offset, syndrome */
 176                                      -1, -1, -1, /* top, mid, low layer */
 177                                      mci->ctl_name,
 178                                      "details unavailable (multiple errors)");
 179         if (cnt_dbe)
 180                 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci,
 181                                      cnt_dbe, /* error count */
 182                                      0, 0, 0, /* pfn, offset, syndrome */
 183                                      -1, -1, -1, /* top, mid, low layer */
 184                                      mci->ctl_name,
 185                                      "details unavailable (multiple errors)");
 186
 187         /* report details for most recent error */
 188         cs_val   = (addr & SDRAM_ERR_ADDR_CS_MASK) >> SDRAM_ERR_ADDR_CS_OFFSET;
 189         bank_val = (addr & SDRAM_ERR_ADDR_BANK_MASK) >> SDRAM_ERR_ADDR_BANK_OFFSET;
 190         row_val  = (calc_ecc & SDRAM_ERR_CALC_ECC_ROW_MASK) >> SDRAM_ERR_CALC_ECC_ROW_OFFSET;
 191         col_val  = (addr & SDRAM_ERR_ADDR_COL_MASK) >> SDRAM_ERR_ADDR_COL_OFFSET;
 192         syndrome_val = (recv_ecc ^ calc_ecc) & 0xff;
 193         addr_val = axp_mc_calc_address(drvdata, cs_val, bank_val, row_val,
 194                                        col_val);
 195         msg += sprintf(msg, "row=0x%04x ", row_val); /* 11 chars */
 196         msg += sprintf(msg, "bank=0x%x ", bank_val); /*  9 chars */
 197         msg += sprintf(msg, "col=0x%04x ", col_val); /* 11 chars */
 198         msg += sprintf(msg, "cs=%d", cs_val);        /*  4 chars */
 199
 200         if (!(addr & SDRAM_ERR_ADDR_TYPE_MASK)) {
 201                 edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci,
 202                                      1, /* error count */
 203                                      addr_val >> PAGE_SHIFT,
 204                                      addr_val & ~PAGE_MASK,
 205                                      syndrome_val,
 206                                      cs_val, -1, -1, /* top, mid, low layer */
 207                                      mci->ctl_name, drvdata->msg);
 208         } else {
 209                 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci,
 210                                      1, /* error count */
 211                                      addr_val >> PAGE_SHIFT,
 212                                      addr_val & ~PAGE_MASK,
 213                                      syndrome_val,
 214                                      cs_val, -1, -1, /* top, mid, low layer */
 215                                      mci->ctl_name, drvdata->msg);
 216         }
 217 }
 218
 219 static void axp_mc_read_config(struct mem_ctl_info *mci)
 220 {
 221         struct axp_mc_drvdata *drvdata = mci->pvt_info;
 222         uint32_t config, addr_ctrl, rank_ctrl;
 223         unsigned int i, cs_struct, cs_size;
 224         struct dimm_info *dimm;
 225
 226         config = readl(drvdata->base + SDRAM_CONFIG_REG);
 227         if (config & SDRAM_CONFIG_BUS_WIDTH_MASK)
 228                 /* 64 bit */
 229                 drvdata->width = 8;
 230         else
 231                 /* 32 bit */
 232                 drvdata->width = 4;
 233
 234         addr_ctrl = readl(drvdata->base + SDRAM_ADDR_CTRL_REG);
 235         rank_ctrl = readl(drvdata->base + SDRAM_RANK_CTRL_REG);
 236         for (i = 0; i < SDRAM_NUM_CS; i++) {
 237                 dimm = mci->dimms[i];
 238
 239                 if (!(rank_ctrl & SDRAM_RANK_CTRL_EXIST_MASK(i)))
 240                         continue;
 241
 242                 drvdata->cs_addr_sel[i] =
 243                         !!(addr_ctrl & SDRAM_ADDR_CTRL_ADDR_SEL_MASK(i));
 244
 245                 cs_struct = (addr_ctrl & SDRAM_ADDR_CTRL_STRUCT_MASK(i)) >> SDRAM_ADDR_CTRL_STRUCT_OFFSET(i);
 246                 cs_size   = ((addr_ctrl & SDRAM_ADDR_CTRL_SIZE_HIGH_MASK(i)) >> (SDRAM_ADDR_CTRL_SIZE_HIGH_OFFSET(i) - 2) |
 247                             ((addr_ctrl & SDRAM_ADDR_CTRL_SIZE_LOW_MASK(i)) >> SDRAM_ADDR_CTRL_SIZE_LOW_OFFSET(i)));
 248
 249                 switch (cs_size) {
 250                 case 0: /* 2GBit */
 251                         dimm->nr_pages = 524288;
 252                         break;
 253                 case 1: /* 256MBit */
 254                         dimm->nr_pages = 65536;
 255                         break;
 256                 case 2: /* 512MBit */
 257                         dimm->nr_pages = 131072;
 258                         break;
 259                 case 3: /* 1GBit */
 260                         dimm->nr_pages = 262144;
 261                         break;
 262                 case 4: /* 4GBit */
 263                         dimm->nr_pages = 1048576;
 264                         break;
 265                 case 5: /* 8GBit */
 266                         dimm->nr_pages = 2097152;
 267                         break;
 268                 }
 269                 dimm->grain = 8;
 270                 dimm->dtype = cs_struct ? DEV_X16 : DEV_X8;
 271                 dimm->mtype = (config & SDRAM_CONFIG_REGISTERED_MASK) ?
 272                         MEM_RDDR3 : MEM_DDR3;
 273                 dimm->edac_mode = EDAC_SECDED;
 274         }
 275 }
 276
 277 static const struct of_device_id axp_mc_of_match[] = {
 278         {.compatible = "marvell,armada-xp-sdram-controller",},
 279         {},
 280 };
 281 MODULE_DEVICE_TABLE(of, axp_mc_of_match);
 282
 283 static int axp_mc_probe(struct platform_device *pdev)
 284 {
 285         struct axp_mc_drvdata *drvdata;
 286         struct edac_mc_layer layers[1];
 287         const struct of_device_id *id;
 288         struct mem_ctl_info *mci;
 289         void __iomem *base;
 290         uint32_t config;
 291
 292         base = devm_platform_ioremap_resource(pdev, 0);
 293         if (IS_ERR(base)) {
 294                 dev_err(&pdev->dev, "Unable to map regs\n");
 295                 return PTR_ERR(base);
 296         }
 297
 298         config = readl(base + SDRAM_CONFIG_REG);
 299         if (!(config & SDRAM_CONFIG_ECC_MASK)) {
 300                 dev_warn(&pdev->dev, "SDRAM ECC is not enabled\n");
 301                 return -EINVAL;
 302         }
 303
 304         layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
 305         layers[0].size = SDRAM_NUM_CS;
 306         layers[0].is_virt_csrow = true;
 307
 308         mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, sizeof(*drvdata));
 309         if (!mci)
 310                 return -ENOMEM;
 311
 312         drvdata = mci->pvt_info;
 313         drvdata->base = base;
 314         mci->pdev = &pdev->dev;
 315         platform_set_drvdata(pdev, mci);
 316
 317         id = of_match_device(axp_mc_of_match, &pdev->dev);
 318         mci->edac_check = axp_mc_check;
 319         mci->mtype_cap = MEM_FLAG_DDR3;
 320         mci->edac_cap = EDAC_FLAG_SECDED;
 321         mci->mod_name = pdev->dev.driver->name;
 322         mci->ctl_name = id ? id->compatible : "unknown";
 323         mci->dev_name = dev_name(&pdev->dev);
 324         mci->scrub_mode = SCRUB_NONE;
 325
 326         axp_mc_read_config(mci);
 327
 328         /* These SoCs have a reduced width bus */
 329         if (of_machine_is_compatible("marvell,armada380") ||
 330             of_machine_is_compatible("marvell,armadaxp-98dx3236"))
 331                 drvdata->width /= 2;
 332
 333         /* configure SBE threshold */
 334         /* it seems that SBEs are not captured otherwise */
 335         writel(1 << SDRAM_ERR_CTRL_THR_OFFSET, drvdata->base + SDRAM_ERR_CTRL_REG);
 336
 337         /* clear cause registers */
 338         writel(~(SDRAM_ERR_CAUSE_DBE_MASK | SDRAM_ERR_CAUSE_SBE_MASK), drvdata->base + SDRAM_ERR_CAUSE_ERR_REG);
 339         writel(~(SDRAM_ERR_CAUSE_DBE_MASK | SDRAM_ERR_CAUSE_SBE_MASK), drvdata->base + SDRAM_ERR_CAUSE_MSG_REG);
 340
 341         /* clear counter registers */
 342         writel(0, drvdata->base + SDRAM_ERR_SBE_COUNT_REG);
 343         writel(0, drvdata->base + SDRAM_ERR_DBE_COUNT_REG);
 344
 345         if (edac_mc_add_mc(mci)) {
 346                 edac_mc_free(mci);
 347                 return -EINVAL;
 348         }
 349         edac_op_state = EDAC_OPSTATE_POLL;
 350
 351         return 0;
 352 }
 353
 354 static int axp_mc_remove(struct platform_device *pdev)
 355 {
 356         struct mem_ctl_info *mci = platform_get_drvdata(pdev);
 357
 358         edac_mc_del_mc(&pdev->dev);
 359         edac_mc_free(mci);
 360         platform_set_drvdata(pdev, NULL);
 361
 362         return 0;
 363 }
 364
 365 static struct platform_driver axp_mc_driver = {
 366         .probe = axp_mc_probe,
 367         .remove = axp_mc_remove,
 368         .driver = {
 369                 .name = "armada_xp_mc_edac",
 370                 .of_match_table = of_match_ptr(axp_mc_of_match),
 371         },
 372 };
 373
 374 /************************ EDAC Device (L2 Cache) ***************************/
 375
 376 struct aurora_l2_drvdata {
 377         void __iomem *base;
 378
 379         char msg[128];
 380
 381         /* error injection via debugfs */
 382         uint32_t inject_addr;
 383         uint32_t inject_mask;
 384         uint8_t inject_ctl;
 385
 386         struct dentry *debugfs;
 387 };
 388
 389 #ifdef CONFIG_EDAC_DEBUG
 390 static void aurora_l2_inject(struct aurora_l2_drvdata *drvdata)
 391 {
 392         drvdata->inject_addr &= AURORA_ERR_INJECT_CTL_ADDR_MASK;
 393         drvdata->inject_ctl &= AURORA_ERR_INJECT_CTL_EN_MASK;
 394         writel(0, drvdata->base + AURORA_ERR_INJECT_CTL_REG);
 395         writel(drvdata->inject_mask, drvdata->base + AURORA_ERR_INJECT_MASK_REG);
 396         writel(drvdata->inject_addr | drvdata->inject_ctl, drvdata->base + AURORA_ERR_INJECT_CTL_REG);
 397 }
 398 #endif
 399
 400 static void aurora_l2_check(struct edac_device_ctl_info *dci)
 401 {
 402         struct aurora_l2_drvdata *drvdata = dci->pvt_info;
 403         uint32_t cnt, src, txn, err, attr_cap, addr_cap, way_cap;
 404         unsigned int cnt_ce, cnt_ue;
 405         char *msg = drvdata->msg;
 406         size_t size = sizeof(drvdata->msg);
 407         size_t len = 0;
 408
 409         cnt = readl(drvdata->base + AURORA_ERR_CNT_REG);
 410         attr_cap = readl(drvdata->base + AURORA_ERR_ATTR_CAP_REG);
 411         addr_cap = readl(drvdata->base + AURORA_ERR_ADDR_CAP_REG);
 412         way_cap = readl(drvdata->base + AURORA_ERR_WAY_CAP_REG);
 413
 414         cnt_ce = (cnt & AURORA_ERR_CNT_CE_MASK) >> AURORA_ERR_CNT_CE_OFFSET;
 415         cnt_ue = (cnt & AURORA_ERR_CNT_UE_MASK) >> AURORA_ERR_CNT_UE_OFFSET;
 416         /* clear error counter registers */
 417         if (cnt_ce || cnt_ue)
 418                 writel(AURORA_ERR_CNT_CLR, drvdata->base + AURORA_ERR_CNT_REG);
 419
 420         if (!(attr_cap & AURORA_ERR_ATTR_CAP_VALID))
 421                 goto clear_remaining;
 422
 423         src = (attr_cap & AURORA_ERR_ATTR_SRC_MSK) >> AURORA_ERR_ATTR_SRC_OFF;
 424         if (src <= 3)
 425                 len += scnprintf(msg+len, size-len, "src=CPU%d ", src);
 426         else
 427                 len += scnprintf(msg+len, size-len, "src=IO ");
 428
 429         txn =  (attr_cap & AURORA_ERR_ATTR_TXN_MSK) >> AURORA_ERR_ATTR_TXN_OFF;
 430         switch (txn) {
 431         case 0:
 432                 len += scnprintf(msg+len, size-len, "txn=Data-Read ");
 433                 break;
 434         case 1:
 435                 len += scnprintf(msg+len, size-len, "txn=Isn-Read ");
 436                 break;
 437         case 2:
 438                 len += scnprintf(msg+len, size-len, "txn=Clean-Flush ");
 439                 break;
 440         case 3:
 441                 len += scnprintf(msg+len, size-len, "txn=Eviction ");
 442                 break;
 443         case 4:
 444                 len += scnprintf(msg+len, size-len,
 445                                 "txn=Read-Modify-Write ");
 446                 break;
 447         }
 448
 449         err = (attr_cap & AURORA_ERR_ATTR_ERR_MSK) >> AURORA_ERR_ATTR_ERR_OFF;
 450         switch (err) {
 451         case 0:
 452                 len += scnprintf(msg+len, size-len, "err=CorrECC ");
 453                 break;
 454         case 1:
 455                 len += scnprintf(msg+len, size-len, "err=UnCorrECC ");
 456                 break;
 457         case 2:
 458                 len += scnprintf(msg+len, size-len, "err=TagParity ");
 459                 break;
 460         }
 461
 462         len += scnprintf(msg+len, size-len, "addr=0x%x ", addr_cap & AURORA_ERR_ADDR_CAP_ADDR_MASK);
 463         len += scnprintf(msg+len, size-len, "index=0x%x ", (way_cap & AURORA_ERR_WAY_IDX_MSK) >> AURORA_ERR_WAY_IDX_OFF);
 464         len += scnprintf(msg+len, size-len, "way=0x%x", (way_cap & AURORA_ERR_WAY_CAP_WAY_MASK) >> AURORA_ERR_WAY_CAP_WAY_OFFSET);
 465
 466         /* clear error capture registers */
 467         writel(AURORA_ERR_ATTR_CAP_VALID, drvdata->base + AURORA_ERR_ATTR_CAP_REG);
 468         if (err) {
 469                 /* UnCorrECC or TagParity */
 470                 if (cnt_ue)
 471                         cnt_ue--;
 472                 edac_device_handle_ue(dci, 0, 0, drvdata->msg);
 473         } else {
 474                 if (cnt_ce)
 475                         cnt_ce--;
 476                 edac_device_handle_ce(dci, 0, 0, drvdata->msg);
 477         }
 478
 479 clear_remaining:
 480         /* report remaining errors */
 481         while (cnt_ue--)
 482                 edac_device_handle_ue(dci, 0, 0, "details unavailable (multiple errors)");
 483         while (cnt_ce--)
 484                 edac_device_handle_ue(dci, 0, 0, "details unavailable (multiple errors)");
 485 }
 486
 487 static void aurora_l2_poll(struct edac_device_ctl_info *dci)
 488 {
 489 #ifdef CONFIG_EDAC_DEBUG
 490         struct aurora_l2_drvdata *drvdata = dci->pvt_info;
 491 #endif
 492
 493         aurora_l2_check(dci);
 494 #ifdef CONFIG_EDAC_DEBUG
 495         aurora_l2_inject(drvdata);
 496 #endif
 497 }
 498
 499 static const struct of_device_id aurora_l2_of_match[] = {
 500         {.compatible = "marvell,aurora-system-cache",},
 501         {},
 502 };
 503 MODULE_DEVICE_TABLE(of, aurora_l2_of_match);
 504
 505 static int aurora_l2_probe(struct platform_device *pdev)
 506 {
 507         struct aurora_l2_drvdata *drvdata;
 508         struct edac_device_ctl_info *dci;
 509         const struct of_device_id *id;
 510         uint32_t l2x0_aux_ctrl;
 511         void __iomem *base;
 512
 513         base = devm_platform_ioremap_resource(pdev, 0);
 514         if (IS_ERR(base)) {
 515                 dev_err(&pdev->dev, "Unable to map regs\n");
 516                 return PTR_ERR(base);
 517         }
 518
 519         l2x0_aux_ctrl = readl(base + L2X0_AUX_CTRL);
 520         if (!(l2x0_aux_ctrl & AURORA_ACR_PARITY_EN))
 521                 dev_warn(&pdev->dev, "tag parity is not enabled\n");
 522         if (!(l2x0_aux_ctrl & AURORA_ACR_ECC_EN))
 523                 dev_warn(&pdev->dev, "data ECC is not enabled\n");
 524
 525         dci = edac_device_alloc_ctl_info(sizeof(*drvdata),
 526                                          "cpu", 1, "L", 1, 2, NULL, 0, 0);
 527         if (!dci)
 528                 return -ENOMEM;
 529
 530         drvdata = dci->pvt_info;
 531         drvdata->base = base;
 532         dci->dev = &pdev->dev;
 533         platform_set_drvdata(pdev, dci);
 534
 535         id = of_match_device(aurora_l2_of_match, &pdev->dev);
 536         dci->edac_check = aurora_l2_poll;
 537         dci->mod_name = pdev->dev.driver->name;
 538         dci->ctl_name = id ? id->compatible : "unknown";
 539         dci->dev_name = dev_name(&pdev->dev);
 540
 541         /* clear registers */
 542         writel(AURORA_ERR_CNT_CLR, drvdata->base + AURORA_ERR_CNT_REG);
 543         writel(AURORA_ERR_ATTR_CAP_VALID, drvdata->base + AURORA_ERR_ATTR_CAP_REG);
 544
 545         if (edac_device_add_device(dci)) {
 546                 edac_device_free_ctl_info(dci);
 547                 return -EINVAL;
 548         }
 549
 550 #ifdef CONFIG_EDAC_DEBUG
 551         drvdata->debugfs = edac_debugfs_create_dir(dev_name(&pdev->dev));
 552         if (drvdata->debugfs) {
 553                 edac_debugfs_create_x32("inject_addr", 0644,
 554                                         drvdata->debugfs,
 555                                         &drvdata->inject_addr);
 556                 edac_debugfs_create_x32("inject_mask", 0644,
 557                                         drvdata->debugfs,
 558                                         &drvdata->inject_mask);
 559                 edac_debugfs_create_x8("inject_ctl", 0644,
 560                                        drvdata->debugfs, &drvdata->inject_ctl);
 561         }
 562 #endif
 563
 564         return 0;
 565 }
 566
 567 static int aurora_l2_remove(struct platform_device *pdev)
 568 {
 569         struct edac_device_ctl_info *dci = platform_get_drvdata(pdev);
 570 #ifdef CONFIG_EDAC_DEBUG
 571         struct aurora_l2_drvdata *drvdata = dci->pvt_info;
 572
 573         edac_debugfs_remove_recursive(drvdata->debugfs);
 574 #endif
 575         edac_device_del_device(&pdev->dev);
 576         edac_device_free_ctl_info(dci);
 577         platform_set_drvdata(pdev, NULL);
 578
 579         return 0;
 580 }
 581
 582 static struct platform_driver aurora_l2_driver = {
 583         .probe = aurora_l2_probe,
 584         .remove = aurora_l2_remove,
 585         .driver = {
 586                 .name = "aurora_l2_edac",
 587                 .of_match_table = of_match_ptr(aurora_l2_of_match),
 588         },
 589 };
 590
 591 /************************ Driver registration ******************************/
 592
 593 static struct platform_driver * const drivers[] = {
 594         &axp_mc_driver,
 595         &aurora_l2_driver,
 596 };
 597
 598 static int __init armada_xp_edac_init(void)
 599 {
 600         int res;
 601
 602         /* only polling is supported */
 603         edac_op_state = EDAC_OPSTATE_POLL;
 604
 605         res = platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 606         if (res)
 607                 pr_warn("Armada XP EDAC drivers fail to register\n");
 608
 609         return 0;
 610 }
 611 module_init(armada_xp_edac_init);
 612
 613 static void __exit armada_xp_edac_exit(void)
 614 {
 615         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 616 }
 617 module_exit(armada_xp_edac_exit);
 618
 619 MODULE_LICENSE("GPL v2");
 620 MODULE_AUTHOR("Pengutronix");
 621 MODULE_DESCRIPTION("EDAC Drivers for Marvell Armada XP SDRAM and L2 Cache Controller");