arch/sparc/kernel/chmc.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* chmc.c: Driver for UltraSPARC-III memory controller.
   3  *
   4  * Copyright (C) 2001, 2007, 2008 David S. Miller ([email protected])
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/kernel.h>
   9 #include <linux/types.h>
  10 #include <linux/slab.h>
  11 #include <linux/list.h>
  12 #include <linux/string.h>
  13 #include <linux/sched.h>
  14 #include <linux/smp.h>
  15 #include <linux/errno.h>
  16 #include <linux/init.h>
  17 #include <linux/of.h>
  18 #include <linux/of_device.h>
  19 #include <asm/spitfire.h>
  20 #include <asm/chmctrl.h>
  21 #include <asm/cpudata.h>
  22 #include <asm/oplib.h>
  23 #include <asm/prom.h>
  24 #include <asm/head.h>
  25 #include <asm/io.h>
  26 #include <asm/memctrl.h>
  27
  28 #define DRV_MODULE_NAME         "chmc"
  29 #define PFX DRV_MODULE_NAME     ": "
  30 #define DRV_MODULE_VERSION      "0.2"
  31
  32 MODULE_AUTHOR("David S. Miller ([email protected])");
  33 MODULE_DESCRIPTION("UltraSPARC-III memory controller driver");
  34 MODULE_LICENSE("GPL");
  35 MODULE_VERSION(DRV_MODULE_VERSION);
  36
  37 static int mc_type;
  38 #define MC_TYPE_SAFARI          1
  39 #define MC_TYPE_JBUS            2
  40
  41 static dimm_printer_t us3mc_dimm_printer;
  42
  43 #define CHMCTRL_NDGRPS  2
  44 #define CHMCTRL_NDIMMS  4
  45
  46 #define CHMC_DIMMS_PER_MC       (CHMCTRL_NDGRPS * CHMCTRL_NDIMMS)
  47
  48 /* OBP memory-layout property format. */
  49 struct chmc_obp_map {
  50         unsigned char   dimm_map[144];
  51         unsigned char   pin_map[576];
  52 };
  53
  54 #define DIMM_LABEL_SZ   8
  55
  56 struct chmc_obp_mem_layout {
  57         /* One max 8-byte string label per DIMM.  Usually
  58          * this matches the label on the motherboard where
  59          * that DIMM resides.
  60          */
  61         char                    dimm_labels[CHMC_DIMMS_PER_MC][DIMM_LABEL_SZ];
  62
  63         /* If symmetric use map[0], else it is
  64          * asymmetric and map[1] should be used.
  65          */
  66         char                    symmetric;
  67
  68         struct chmc_obp_map     map[2];
  69 };
  70
  71 #define CHMCTRL_NBANKS  4
  72
  73 struct chmc_bank_info {
  74         struct chmc             *p;
  75         int                     bank_id;
  76
  77         u64                     raw_reg;
  78         int                     valid;
  79         int                     uk;
  80         int                     um;
  81         int                     lk;
  82         int                     lm;
  83         int                     interleave;
  84         unsigned long           base;
  85         unsigned long           size;
  86 };
  87
  88 struct chmc {
  89         struct list_head                list;
  90         int                             portid;
  91
  92         struct chmc_obp_mem_layout      layout_prop;
  93         int                             layout_size;
  94
  95         void __iomem                    *regs;
  96
  97         u64                             timing_control1;
  98         u64                             timing_control2;
  99         u64                             timing_control3;
 100         u64                             timing_control4;
 101         u64                             memaddr_control;
 102
 103         struct chmc_bank_info           logical_banks[CHMCTRL_NBANKS];
 104 };
 105
 106 #define JBUSMC_REGS_SIZE                8
 107
 108 #define JB_MC_REG1_DIMM2_BANK3          0x8000000000000000UL
 109 #define JB_MC_REG1_DIMM1_BANK1          0x4000000000000000UL
 110 #define JB_MC_REG1_DIMM2_BANK2          0x2000000000000000UL
 111 #define JB_MC_REG1_DIMM1_BANK0          0x1000000000000000UL
 112 #define JB_MC_REG1_XOR                  0x0000010000000000UL
 113 #define JB_MC_REG1_ADDR_GEN_2           0x000000e000000000UL
 114 #define JB_MC_REG1_ADDR_GEN_2_SHIFT     37
 115 #define JB_MC_REG1_ADDR_GEN_1           0x0000001c00000000UL
 116 #define JB_MC_REG1_ADDR_GEN_1_SHIFT     34
 117 #define JB_MC_REG1_INTERLEAVE           0x0000000001800000UL
 118 #define JB_MC_REG1_INTERLEAVE_SHIFT     23
 119 #define JB_MC_REG1_DIMM2_PTYPE          0x0000000000200000UL
 120 #define JB_MC_REG1_DIMM2_PTYPE_SHIFT    21
 121 #define JB_MC_REG1_DIMM1_PTYPE          0x0000000000100000UL
 122 #define JB_MC_REG1_DIMM1_PTYPE_SHIFT    20
 123
 124 #define PART_TYPE_X8            0
 125 #define PART_TYPE_X4            1
 126
 127 #define INTERLEAVE_NONE         0
 128 #define INTERLEAVE_SAME         1
 129 #define INTERLEAVE_INTERNAL     2
 130 #define INTERLEAVE_BOTH         3
 131
 132 #define ADDR_GEN_128MB          0
 133 #define ADDR_GEN_256MB          1
 134 #define ADDR_GEN_512MB          2
 135 #define ADDR_GEN_1GB            3
 136
 137 #define JB_NUM_DIMM_GROUPS      2
 138 #define JB_NUM_DIMMS_PER_GROUP  2
 139 #define JB_NUM_DIMMS            (JB_NUM_DIMM_GROUPS * JB_NUM_DIMMS_PER_GROUP)
 140
 141 struct jbusmc_obp_map {
 142         unsigned char   dimm_map[18];
 143         unsigned char   pin_map[144];
 144 };
 145
 146 struct jbusmc_obp_mem_layout {
 147         /* One max 8-byte string label per DIMM.  Usually
 148          * this matches the label on the motherboard where
 149          * that DIMM resides.
 150          */
 151         char            dimm_labels[JB_NUM_DIMMS][DIMM_LABEL_SZ];
 152
 153         /* If symmetric use map[0], else it is
 154          * asymmetric and map[1] should be used.
 155          */
 156         char                    symmetric;
 157
 158         struct jbusmc_obp_map   map;
 159
 160         char                    _pad;
 161 };
 162
 163 struct jbusmc_dimm_group {
 164         struct jbusmc                   *controller;
 165         int                             index;
 166         u64                             base_addr;
 167         u64                             size;
 168 };
 169
 170 struct jbusmc {
 171         void __iomem                    *regs;
 172         u64                             mc_reg_1;
 173         u32                             portid;
 174         struct jbusmc_obp_mem_layout    layout;
 175         int                             layout_len;
 176         int                             num_dimm_groups;
 177         struct jbusmc_dimm_group        dimm_groups[JB_NUM_DIMM_GROUPS];
 178         struct list_head                list;
 179 };
 180
 181 static DEFINE_SPINLOCK(mctrl_list_lock);
 182 static LIST_HEAD(mctrl_list);
 183
 184 static void mc_list_add(struct list_head *list)
 185 {
 186         spin_lock(&mctrl_list_lock);
 187         list_add(list, &mctrl_list);
 188         spin_unlock(&mctrl_list_lock);
 189 }
 190
 191 static void mc_list_del(struct list_head *list)
 192 {
 193         spin_lock(&mctrl_list_lock);
 194         list_del_init(list);
 195         spin_unlock(&mctrl_list_lock);
 196 }
 197
 198 #define SYNDROME_MIN    -1
 199 #define SYNDROME_MAX    144
 200
 201 /* Covert syndrome code into the way the bits are positioned
 202  * on the bus.
 203  */
 204 static int syndrome_to_qword_code(int syndrome_code)
 205 {
 206         if (syndrome_code < 128)
 207                 syndrome_code += 16;
 208         else if (syndrome_code < 128 + 9)
 209                 syndrome_code -= (128 - 7);
 210         else if (syndrome_code < (128 + 9 + 3))
 211                 syndrome_code -= (128 + 9 - 4);
 212         else
 213                 syndrome_code -= (128 + 9 + 3);
 214         return syndrome_code;
 215 }
 216
 217 /* All this magic has to do with how a cache line comes over the wire
 218  * on Safari and JBUS.  A 64-bit line comes over in 1 or more quadword
 219  * cycles, each of which transmit ECC/MTAG info as well as the actual
 220  * data.
 221  */
 222 #define L2_LINE_SIZE            64
 223 #define L2_LINE_ADDR_MSK        (L2_LINE_SIZE - 1)
 224 #define QW_PER_LINE             4
 225 #define QW_BYTES                (L2_LINE_SIZE / QW_PER_LINE)
 226 #define QW_BITS                 144
 227 #define SAFARI_LAST_BIT         (576 - 1)
 228 #define JBUS_LAST_BIT           (144 - 1)
 229
 230 static void get_pin_and_dimm_str(int syndrome_code, unsigned long paddr,
 231                                  int *pin_p, char **dimm_str_p, void *_prop,
 232                                  int base_dimm_offset)
 233 {
 234         int qword_code = syndrome_to_qword_code(syndrome_code);
 235         int cache_line_offset;
 236         int offset_inverse;
 237         int dimm_map_index;
 238         int map_val;
 239
 240         if (mc_type == MC_TYPE_JBUS) {
 241                 struct jbusmc_obp_mem_layout *p = _prop;
 242
 243                 /* JBUS */
 244                 cache_line_offset = qword_code;
 245                 offset_inverse = (JBUS_LAST_BIT - cache_line_offset);
 246                 dimm_map_index = offset_inverse / 8;
 247                 map_val = p->map.dimm_map[dimm_map_index];
 248                 map_val = ((map_val >> ((7 - (offset_inverse & 7)))) & 1);
 249                 *dimm_str_p = p->dimm_labels[base_dimm_offset + map_val];
 250                 *pin_p = p->map.pin_map[cache_line_offset];
 251         } else {
 252                 struct chmc_obp_mem_layout *p = _prop;
 253                 struct chmc_obp_map *mp;
 254                 int qword;
 255
 256                 /* Safari */
 257                 if (p->symmetric)
 258                         mp = &p->map[0];
 259                 else
 260                         mp = &p->map[1];
 261
 262                 qword = (paddr & L2_LINE_ADDR_MSK) / QW_BYTES;
 263                 cache_line_offset = ((3 - qword) * QW_BITS) + qword_code;
 264                 offset_inverse = (SAFARI_LAST_BIT - cache_line_offset);
 265                 dimm_map_index = offset_inverse >> 2;
 266                 map_val = mp->dimm_map[dimm_map_index];
 267                 map_val = ((map_val >> ((3 - (offset_inverse & 3)) << 1)) & 0x3);
 268                 *dimm_str_p = p->dimm_labels[base_dimm_offset + map_val];
 269                 *pin_p = mp->pin_map[cache_line_offset];
 270         }
 271 }
 272
 273 static struct jbusmc_dimm_group *jbusmc_find_dimm_group(unsigned long phys_addr)
 274 {
 275         struct jbusmc *p;
 276
 277         list_for_each_entry(p, &mctrl_list, list) {
 278                 int i;
 279
 280                 for (i = 0; i < p->num_dimm_groups; i++) {
 281                         struct jbusmc_dimm_group *dp = &p->dimm_groups[i];
 282
 283                         if (phys_addr < dp->base_addr ||
 284                             (dp->base_addr + dp->size) <= phys_addr)
 285                                 continue;
 286
 287                         return dp;
 288                 }
 289         }
 290         return NULL;
 291 }
 292
 293 static int jbusmc_print_dimm(int syndrome_code,
 294                              unsigned long phys_addr,
 295                              char *buf, int buflen)
 296 {
 297         struct jbusmc_obp_mem_layout *prop;
 298         struct jbusmc_dimm_group *dp;
 299         struct jbusmc *p;
 300         int first_dimm;
 301
 302         dp = jbusmc_find_dimm_group(phys_addr);
 303         if (dp == NULL ||
 304             syndrome_code < SYNDROME_MIN ||
 305             syndrome_code > SYNDROME_MAX) {
 306                 buf[0] = '?';
 307                 buf[1] = '?';
 308                 buf[2] = '?';
 309                 buf[3] = '\0';
 310                 return 0;
 311         }
 312         p = dp->controller;
 313         prop = &p->layout;
 314
 315         first_dimm = dp->index * JB_NUM_DIMMS_PER_GROUP;
 316
 317         if (syndrome_code != SYNDROME_MIN) {
 318                 char *dimm_str;
 319                 int pin;
 320
 321                 get_pin_and_dimm_str(syndrome_code, phys_addr, &pin,
 322                                      &dimm_str, prop, first_dimm);
 323                 sprintf(buf, "%s, pin %3d", dimm_str, pin);
 324         } else {
 325                 int dimm;
 326
 327                 /* Multi-bit error, we just dump out all the
 328                  * dimm labels associated with this dimm group.
 329                  */
 330                 for (dimm = 0; dimm < JB_NUM_DIMMS_PER_GROUP; dimm++) {
 331                         sprintf(buf, "%s ",
 332                                 prop->dimm_labels[first_dimm + dimm]);
 333                         buf += strlen(buf);
 334                 }
 335         }
 336
 337         return 0;
 338 }
 339
 340 static u64 jbusmc_dimm_group_size(u64 base,
 341                                   const struct linux_prom64_registers *mem_regs,
 342                                   int num_mem_regs)
 343 {
 344         u64 max = base + (8UL * 1024 * 1024 * 1024);
 345         u64 max_seen = base;
 346         int i;
 347
 348         for (i = 0; i < num_mem_regs; i++) {
 349                 const struct linux_prom64_registers *ent;
 350                 u64 this_base;
 351                 u64 this_end;
 352
 353                 ent = &mem_regs[i];
 354                 this_base = ent->phys_addr;
 355                 this_end = this_base + ent->reg_size;
 356                 if (base < this_base || base >= this_end)
 357                         continue;
 358                 if (this_end > max)
 359                         this_end = max;
 360                 if (this_end > max_seen)
 361                         max_seen = this_end;
 362         }
 363
 364         return max_seen - base;
 365 }
 366
 367 static void jbusmc_construct_one_dimm_group(struct jbusmc *p,
 368                                             unsigned long index,
 369                                             const struct linux_prom64_registers *mem_regs,
 370                                             int num_mem_regs)
 371 {
 372         struct jbusmc_dimm_group *dp = &p->dimm_groups[index];
 373
 374         dp->controller = p;
 375         dp->index = index;
 376
 377         dp->base_addr  = (p->portid * (64UL * 1024 * 1024 * 1024));
 378         dp->base_addr += (index * (8UL * 1024 * 1024 * 1024));
 379         dp->size = jbusmc_dimm_group_size(dp->base_addr, mem_regs, num_mem_regs);
 380 }
 381
 382 static void jbusmc_construct_dimm_groups(struct jbusmc *p,
 383                                          const struct linux_prom64_registers *mem_regs,
 384                                          int num_mem_regs)
 385 {
 386         if (p->mc_reg_1 & JB_MC_REG1_DIMM1_BANK0) {
 387                 jbusmc_construct_one_dimm_group(p, 0, mem_regs, num_mem_regs);
 388                 p->num_dimm_groups++;
 389         }
 390         if (p->mc_reg_1 & JB_MC_REG1_DIMM2_BANK2) {
 391                 jbusmc_construct_one_dimm_group(p, 1, mem_regs, num_mem_regs);
 392                 p->num_dimm_groups++;
 393         }
 394 }
 395
 396 static int jbusmc_probe(struct platform_device *op)
 397 {
 398         const struct linux_prom64_registers *mem_regs;
 399         struct device_node *mem_node;
 400         int err, len, num_mem_regs;
 401         struct jbusmc *p;
 402         const u32 *prop;
 403         const void *ml;
 404
 405         err = -ENODEV;
 406         mem_node = of_find_node_by_path("/memory");
 407         if (!mem_node) {
 408                 printk(KERN_ERR PFX "Cannot find /memory node.\n");
 409                 goto out;
 410         }
 411         mem_regs = of_get_property(mem_node, "reg", &len);
 412         if (!mem_regs) {
 413                 printk(KERN_ERR PFX "Cannot get reg property of /memory node.\n");
 414                 goto out;
 415         }
 416         num_mem_regs = len / sizeof(*mem_regs);
 417
 418         err = -ENOMEM;
 419         p = kzalloc(sizeof(*p), GFP_KERNEL);
 420         if (!p) {
 421                 printk(KERN_ERR PFX "Cannot allocate struct jbusmc.\n");
 422                 goto out;
 423         }
 424
 425         INIT_LIST_HEAD(&p->list);
 426
 427         err = -ENODEV;
 428         prop = of_get_property(op->dev.of_node, "portid", &len);
 429         if (!prop || len != 4) {
 430                 printk(KERN_ERR PFX "Cannot find portid.\n");
 431                 goto out_free;
 432         }
 433
 434         p->portid = *prop;
 435
 436         prop = of_get_property(op->dev.of_node, "memory-control-register-1", &len);
 437         if (!prop || len != 8) {
 438                 printk(KERN_ERR PFX "Cannot get memory control register 1.\n");
 439                 goto out_free;
 440         }
 441
 442         p->mc_reg_1 = ((u64)prop[0] << 32) | (u64) prop[1];
 443
 444         err = -ENOMEM;
 445         p->regs = of_ioremap(&op->resource[0], 0, JBUSMC_REGS_SIZE, "jbusmc");
 446         if (!p->regs) {
 447                 printk(KERN_ERR PFX "Cannot map jbusmc regs.\n");
 448                 goto out_free;
 449         }
 450
 451         err = -ENODEV;
 452         ml = of_get_property(op->dev.of_node, "memory-layout", &p->layout_len);
 453         if (!ml) {
 454                 printk(KERN_ERR PFX "Cannot get memory layout property.\n");
 455                 goto out_iounmap;
 456         }
 457         if (p->layout_len > sizeof(p->layout)) {
 458                 printk(KERN_ERR PFX "Unexpected memory-layout size %d\n",
 459                        p->layout_len);
 460                 goto out_iounmap;
 461         }
 462         memcpy(&p->layout, ml, p->layout_len);
 463
 464         jbusmc_construct_dimm_groups(p, mem_regs, num_mem_regs);
 465
 466         mc_list_add(&p->list);
 467
 468         printk(KERN_INFO PFX "UltraSPARC-IIIi memory controller at %pOF\n",
 469                op->dev.of_node);
 470
 471         dev_set_drvdata(&op->dev, p);
 472
 473         err = 0;
 474
 475 out:
 476         return err;
 477
 478 out_iounmap:
 479         of_iounmap(&op->resource[0], p->regs, JBUSMC_REGS_SIZE);
 480
 481 out_free:
 482         kfree(p);
 483         goto out;
 484 }
 485
 486 /* Does BANK decode PHYS_ADDR? */
 487 static int chmc_bank_match(struct chmc_bank_info *bp, unsigned long phys_addr)
 488 {
 489         unsigned long upper_bits = (phys_addr & PA_UPPER_BITS) >> PA_UPPER_BITS_SHIFT;
 490         unsigned long lower_bits = (phys_addr & PA_LOWER_BITS) >> PA_LOWER_BITS_SHIFT;
 491
 492         /* Bank must be enabled to match. */
 493         if (bp->valid == 0)
 494                 return 0;
 495
 496         /* Would BANK match upper bits? */
 497         upper_bits ^= bp->um;           /* What bits are different? */
 498         upper_bits  = ~upper_bits;      /* Invert. */
 499         upper_bits |= bp->uk;           /* What bits don't matter for matching? */
 500         upper_bits  = ~upper_bits;      /* Invert. */
 501
 502         if (upper_bits)
 503                 return 0;
 504
 505         /* Would BANK match lower bits? */
 506         lower_bits ^= bp->lm;           /* What bits are different? */
 507         lower_bits  = ~lower_bits;      /* Invert. */
 508         lower_bits |= bp->lk;           /* What bits don't matter for matching? */
 509         lower_bits  = ~lower_bits;      /* Invert. */
 510
 511         if (lower_bits)
 512                 return 0;
 513
 514         /* I always knew you'd be the one. */
 515         return 1;
 516 }
 517
 518 /* Given PHYS_ADDR, search memory controller banks for a match. */
 519 static struct chmc_bank_info *chmc_find_bank(unsigned long phys_addr)
 520 {
 521         struct chmc *p;
 522
 523         list_for_each_entry(p, &mctrl_list, list) {
 524                 int bank_no;
 525
 526                 for (bank_no = 0; bank_no < CHMCTRL_NBANKS; bank_no++) {
 527                         struct chmc_bank_info *bp;
 528
 529                         bp = &p->logical_banks[bank_no];
 530                         if (chmc_bank_match(bp, phys_addr))
 531                                 return bp;
 532                 }
 533         }
 534
 535         return NULL;
 536 }
 537
 538 /* This is the main purpose of this driver. */
 539 static int chmc_print_dimm(int syndrome_code,
 540                            unsigned long phys_addr,
 541                            char *buf, int buflen)
 542 {
 543         struct chmc_bank_info *bp;
 544         struct chmc_obp_mem_layout *prop;
 545         int bank_in_controller, first_dimm;
 546
 547         bp = chmc_find_bank(phys_addr);
 548         if (bp == NULL ||
 549             syndrome_code < SYNDROME_MIN ||
 550             syndrome_code > SYNDROME_MAX) {
 551                 buf[0] = '?';
 552                 buf[1] = '?';
 553                 buf[2] = '?';
 554                 buf[3] = '\0';
 555                 return 0;
 556         }
 557
 558         prop = &bp->p->layout_prop;
 559         bank_in_controller = bp->bank_id & (CHMCTRL_NBANKS - 1);
 560         first_dimm  = (bank_in_controller & (CHMCTRL_NDGRPS - 1));
 561         first_dimm *= CHMCTRL_NDIMMS;
 562
 563         if (syndrome_code != SYNDROME_MIN) {
 564                 char *dimm_str;
 565                 int pin;
 566
 567                 get_pin_and_dimm_str(syndrome_code, phys_addr, &pin,
 568                                      &dimm_str, prop, first_dimm);
 569                 sprintf(buf, "%s, pin %3d", dimm_str, pin);
 570         } else {
 571                 int dimm;
 572
 573                 /* Multi-bit error, we just dump out all the
 574                  * dimm labels associated with this bank.
 575                  */
 576                 for (dimm = 0; dimm < CHMCTRL_NDIMMS; dimm++) {
 577                         sprintf(buf, "%s ",
 578                                 prop->dimm_labels[first_dimm + dimm]);
 579                         buf += strlen(buf);
 580                 }
 581         }
 582         return 0;
 583 }
 584
 585 /* Accessing the registers is slightly complicated.  If you want
 586  * to get at the memory controller which is on the same processor
 587  * the code is executing, you must use special ASI load/store else
 588  * you go through the global mapping.
 589  */
 590 static u64 chmc_read_mcreg(struct chmc *p, unsigned long offset)
 591 {
 592         unsigned long ret, this_cpu;
 593
 594         preempt_disable();
 595
 596         this_cpu = real_hard_smp_processor_id();
 597
 598         if (p->portid == this_cpu) {
 599                 __asm__ __volatile__("ldxa      [%1] %2, %0"
 600                                      : "=r" (ret)
 601                                      : "r" (offset), "i" (ASI_MCU_CTRL_REG));
 602         } else {
 603                 __asm__ __volatile__("ldxa      [%1] %2, %0"
 604                                      : "=r" (ret)
 605                                      : "r" (p->regs + offset),
 606                                        "i" (ASI_PHYS_BYPASS_EC_E));
 607         }
 608
 609         preempt_enable();
 610
 611         return ret;
 612 }
 613
 614 #if 0 /* currently unused */
 615 static void chmc_write_mcreg(struct chmc *p, unsigned long offset, u64 val)
 616 {
 617         if (p->portid == smp_processor_id()) {
 618                 __asm__ __volatile__("stxa      %0, [%1] %2"
 619                                      : : "r" (val),
 620                                          "r" (offset), "i" (ASI_MCU_CTRL_REG));
 621         } else {
 622                 __asm__ __volatile__("ldxa      %0, [%1] %2"
 623                                      : : "r" (val),
 624                                          "r" (p->regs + offset),
 625                                          "i" (ASI_PHYS_BYPASS_EC_E));
 626         }
 627 }
 628 #endif
 629
 630 static void chmc_interpret_one_decode_reg(struct chmc *p, int which_bank, u64 val)
 631 {
 632         struct chmc_bank_info *bp = &p->logical_banks[which_bank];
 633
 634         bp->p = p;
 635         bp->bank_id = (CHMCTRL_NBANKS * p->portid) + which_bank;
 636         bp->raw_reg = val;
 637         bp->valid = (val & MEM_DECODE_VALID) >> MEM_DECODE_VALID_SHIFT;
 638         bp->uk = (val & MEM_DECODE_UK) >> MEM_DECODE_UK_SHIFT;
 639         bp->um = (val & MEM_DECODE_UM) >> MEM_DECODE_UM_SHIFT;
 640         bp->lk = (val & MEM_DECODE_LK) >> MEM_DECODE_LK_SHIFT;
 641         bp->lm = (val & MEM_DECODE_LM) >> MEM_DECODE_LM_SHIFT;
 642
 643         bp->base  =  (bp->um);
 644         bp->base &= ~(bp->uk);
 645         bp->base <<= PA_UPPER_BITS_SHIFT;
 646
 647         switch(bp->lk) {
 648         case 0xf:
 649         default:
 650                 bp->interleave = 1;
 651                 break;
 652
 653         case 0xe:
 654                 bp->interleave = 2;
 655                 break;
 656
 657         case 0xc:
 658                 bp->interleave = 4;
 659                 break;
 660
 661         case 0x8:
 662                 bp->interleave = 8;
 663                 break;
 664
 665         case 0x0:
 666                 bp->interleave = 16;
 667                 break;
 668         }
 669
 670         /* UK[10] is reserved, and UK[11] is not set for the SDRAM
 671          * bank size definition.
 672          */
 673         bp->size = (((unsigned long)bp->uk &
 674                      ((1UL << 10UL) - 1UL)) + 1UL) << PA_UPPER_BITS_SHIFT;
 675         bp->size /= bp->interleave;
 676 }
 677
 678 static void chmc_fetch_decode_regs(struct chmc *p)
 679 {
 680         if (p->layout_size == 0)
 681                 return;
 682
 683         chmc_interpret_one_decode_reg(p, 0,
 684                                       chmc_read_mcreg(p, CHMCTRL_DECODE1));
 685         chmc_interpret_one_decode_reg(p, 1,
 686                                       chmc_read_mcreg(p, CHMCTRL_DECODE2));
 687         chmc_interpret_one_decode_reg(p, 2,
 688                                       chmc_read_mcreg(p, CHMCTRL_DECODE3));
 689         chmc_interpret_one_decode_reg(p, 3,
 690                                       chmc_read_mcreg(p, CHMCTRL_DECODE4));
 691 }
 692
 693 static int chmc_probe(struct platform_device *op)
 694 {
 695         struct device_node *dp = op->dev.of_node;
 696         unsigned long ver;
 697         const void *pval;
 698         int len, portid;
 699         struct chmc *p;
 700         int err;
 701
 702         err = -ENODEV;
 703         __asm__ ("rdpr %%ver, %0" : "=r" (ver));
 704         if ((ver >> 32UL) == __JALAPENO_ID ||
 705             (ver >> 32UL) == __SERRANO_ID)
 706                 goto out;
 707
 708         portid = of_getintprop_default(dp, "portid", -1);
 709         if (portid == -1)
 710                 goto out;
 711
 712         pval = of_get_property(dp, "memory-layout", &len);
 713         if (pval && len > sizeof(p->layout_prop)) {
 714                 printk(KERN_ERR PFX "Unexpected memory-layout property "
 715                        "size %d.\n", len);
 716                 goto out;
 717         }
 718
 719         err = -ENOMEM;
 720         p = kzalloc(sizeof(*p), GFP_KERNEL);
 721         if (!p) {
 722                 printk(KERN_ERR PFX "Could not allocate struct chmc.\n");
 723                 goto out;
 724         }
 725
 726         p->portid = portid;
 727         p->layout_size = len;
 728         if (!pval)
 729                 p->layout_size = 0;
 730         else
 731                 memcpy(&p->layout_prop, pval, len);
 732
 733         p->regs = of_ioremap(&op->resource[0], 0, 0x48, "chmc");
 734         if (!p->regs) {
 735                 printk(KERN_ERR PFX "Could not map registers.\n");
 736                 goto out_free;
 737         }
 738
 739         if (p->layout_size != 0UL) {
 740                 p->timing_control1 = chmc_read_mcreg(p, CHMCTRL_TCTRL1);
 741                 p->timing_control2 = chmc_read_mcreg(p, CHMCTRL_TCTRL2);
 742                 p->timing_control3 = chmc_read_mcreg(p, CHMCTRL_TCTRL3);
 743                 p->timing_control4 = chmc_read_mcreg(p, CHMCTRL_TCTRL4);
 744                 p->memaddr_control = chmc_read_mcreg(p, CHMCTRL_MACTRL);
 745         }
 746
 747         chmc_fetch_decode_regs(p);
 748
 749         mc_list_add(&p->list);
 750
 751         printk(KERN_INFO PFX "UltraSPARC-III memory controller at %pOF [%s]\n",
 752                dp,
 753                (p->layout_size ? "ACTIVE" : "INACTIVE"));
 754
 755         dev_set_drvdata(&op->dev, p);
 756
 757         err = 0;
 758
 759 out:
 760         return err;
 761
 762 out_free:
 763         kfree(p);
 764         goto out;
 765 }
 766
 767 static int us3mc_probe(struct platform_device *op)
 768 {
 769         if (mc_type == MC_TYPE_SAFARI)
 770                 return chmc_probe(op);
 771         else if (mc_type == MC_TYPE_JBUS)
 772                 return jbusmc_probe(op);
 773         return -ENODEV;
 774 }
 775
 776 static void chmc_destroy(struct platform_device *op, struct chmc *p)
 777 {
 778         list_del(&p->list);
 779         of_iounmap(&op->resource[0], p->regs, 0x48);
 780         kfree(p);
 781 }
 782
 783 static void jbusmc_destroy(struct platform_device *op, struct jbusmc *p)
 784 {
 785         mc_list_del(&p->list);
 786         of_iounmap(&op->resource[0], p->regs, JBUSMC_REGS_SIZE);
 787         kfree(p);
 788 }
 789
 790 static int us3mc_remove(struct platform_device *op)
 791 {
 792         void *p = dev_get_drvdata(&op->dev);
 793
 794         if (p) {
 795                 if (mc_type == MC_TYPE_SAFARI)
 796                         chmc_destroy(op, p);
 797                 else if (mc_type == MC_TYPE_JBUS)
 798                         jbusmc_destroy(op, p);
 799         }
 800         return 0;
 801 }
 802
 803 static const struct of_device_id us3mc_match[] = {
 804         {
 805                 .name = "memory-controller",
 806         },
 807         {},
 808 };
 809 MODULE_DEVICE_TABLE(of, us3mc_match);
 810
 811 static struct platform_driver us3mc_driver = {
 812         .driver = {
 813                 .name = "us3mc",
 814                 .of_match_table = us3mc_match,
 815         },
 816         .probe          = us3mc_probe,
 817         .remove         = us3mc_remove,
 818 };
 819
 820 static inline bool us3mc_platform(void)
 821 {
 822         if (tlb_type == cheetah || tlb_type == cheetah_plus)
 823                 return true;
 824         return false;
 825 }
 826
 827 static int __init us3mc_init(void)
 828 {
 829         unsigned long ver;
 830         int ret;
 831
 832         if (!us3mc_platform())
 833                 return -ENODEV;
 834
 835         __asm__ __volatile__("rdpr %%ver, %0" : "=r" (ver));
 836         if ((ver >> 32UL) == __JALAPENO_ID ||
 837             (ver >> 32UL) == __SERRANO_ID) {
 838                 mc_type = MC_TYPE_JBUS;
 839                 us3mc_dimm_printer = jbusmc_print_dimm;
 840         } else {
 841                 mc_type = MC_TYPE_SAFARI;
 842                 us3mc_dimm_printer = chmc_print_dimm;
 843         }
 844
 845         ret = register_dimm_printer(us3mc_dimm_printer);
 846
 847         if (!ret) {
 848                 ret = platform_driver_register(&us3mc_driver);
 849                 if (ret)
 850                         unregister_dimm_printer(us3mc_dimm_printer);
 851         }
 852         return ret;
 853 }
 854
 855 static void __exit us3mc_cleanup(void)
 856 {
 857         if (us3mc_platform()) {
 858                 unregister_dimm_printer(us3mc_dimm_printer);
 859                 platform_driver_unregister(&us3mc_driver);
 860         }
 861 }
 862
 863 module_init(us3mc_init);
 864 module_exit(us3mc_cleanup);