git.oblomov.eu Git - linux-2.6/blob - drivers/ieee1394/csr.c

   1 /*
   2  * IEEE 1394 for Linux
   3  *
   4  * CSR implementation, iso/bus manager implementation.
   5  *
   6  * Copyright (C) 1999 Andreas E. Bombe
   7  *               2002 Manfred Weihs <weihs@ict.tuwien.ac.at>
   8  *
   9  * This code is licensed under the GPL.  See the file COPYING in the root
  10  * directory of the kernel sources for details.
  11  *
  12  *
  13  * Contributions:
  14  *
  15  * Manfred Weihs <weihs@ict.tuwien.ac.at>
  16  *        configuration ROM manipulation
  17  *
  18  */
  19
  20 #include <linux/jiffies.h>
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/moduleparam.h>
  24 #include <linux/param.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/string.h>
  27
  28 #include "csr1212.h"
  29 #include "ieee1394_types.h"
  30 #include "hosts.h"
  31 #include "ieee1394.h"
  32 #include "highlevel.h"
  33 #include "ieee1394_core.h"
  34
  35 /* Module Parameters */
  36 /* this module parameter can be used to disable mapping of the FCP registers */
  37
  38 static int fcp = 1;
  39 module_param(fcp, int, 0444);
  40 MODULE_PARM_DESC(fcp, "Map FCP registers (default = 1, disable = 0).");
  41
  42 static struct csr1212_keyval *node_cap = NULL;
  43
  44 static void add_host(struct hpsb_host *host);
  45 static void remove_host(struct hpsb_host *host);
  46 static void host_reset(struct hpsb_host *host);
  47 static int read_maps(struct hpsb_host *host, int nodeid, quadlet_t *buffer,
  48                      u64 addr, size_t length, u16 fl);
  49 static int write_fcp(struct hpsb_host *host, int nodeid, int dest,
  50                      quadlet_t *data, u64 addr, size_t length, u16 flags);
  51 static int read_regs(struct hpsb_host *host, int nodeid, quadlet_t *buf,
  52                      u64 addr, size_t length, u16 flags);
  53 static int write_regs(struct hpsb_host *host, int nodeid, int destid,
  54                       quadlet_t *data, u64 addr, size_t length, u16 flags);
  55 static int lock_regs(struct hpsb_host *host, int nodeid, quadlet_t *store,
  56                      u64 addr, quadlet_t data, quadlet_t arg, int extcode, u16 fl);
  57 static int lock64_regs(struct hpsb_host *host, int nodeid, octlet_t * store,
  58                        u64 addr, octlet_t data, octlet_t arg, int extcode, u16 fl);
  59 static int read_config_rom(struct hpsb_host *host, int nodeid, quadlet_t *buffer,
  60                            u64 addr, size_t length, u16 fl);
  61 static u64 allocate_addr_range(u64 size, u32 alignment, void *__host);
  62 static void release_addr_range(u64 addr, void *__host);
  63
  64 static struct hpsb_highlevel csr_highlevel = {
  65         .name =         "standard registers",
  66         .add_host =     add_host,
  67         .remove_host =  remove_host,
  68         .host_reset =   host_reset,
  69 };
  70
  71 static struct hpsb_address_ops map_ops = {
  72         .read = read_maps,
  73 };
  74
  75 static struct hpsb_address_ops fcp_ops = {
  76         .write = write_fcp,
  77 };
  78
  79 static struct hpsb_address_ops reg_ops = {
  80         .read = read_regs,
  81         .write = write_regs,
  82         .lock = lock_regs,
  83         .lock64 = lock64_regs,
  84 };
  85
  86 static struct hpsb_address_ops config_rom_ops = {
  87         .read = read_config_rom,
  88 };
  89
  90 struct csr1212_bus_ops csr_bus_ops = {
  91         .allocate_addr_range =  allocate_addr_range,
  92         .release_addr =         release_addr_range,
  93 };
  94
  95
  96 static u16 csr_crc16(unsigned *data, int length)
  97 {
  98         int check=0, i;
  99         int shift, sum, next=0;
 100
 101         for (i = length; i; i--) {
 102                 for (next = check, shift = 28; shift >= 0; shift -= 4 ) {
 103                         sum = ((next >> 12) ^ (be32_to_cpu(*data) >> shift)) & 0xf;
 104                         next = (next << 4) ^ (sum << 12) ^ (sum << 5) ^ (sum);
 105                 }
 106                 check = next & 0xffff;
 107                 data++;
 108         }
 109
 110         return check;
 111 }
 112
 113 static void host_reset(struct hpsb_host *host)
 114 {
 115         host->csr.state &= 0x300;
 116
 117         host->csr.bus_manager_id = 0x3f;
 118         host->csr.bandwidth_available = 4915;
 119         host->csr.channels_available_hi = 0xfffffffe;   /* pre-alloc ch 31 per 1394a-2000 */
 120         host->csr.channels_available_lo = ~0;
 121         host->csr.broadcast_channel = 0x80000000 | 31;
 122
 123         if (host->is_irm) {
 124                 if (host->driver->hw_csr_reg) {
 125                         host->driver->hw_csr_reg(host, 2, 0xfffffffe, ~0);
 126                 }
 127         }
 128
 129         host->csr.node_ids = host->node_id << 16;
 130
 131         if (!host->is_root) {
 132                 /* clear cmstr bit */
 133                 host->csr.state &= ~0x100;
 134         }
 135
 136         host->csr.topology_map[1] =
 137                 cpu_to_be32(be32_to_cpu(host->csr.topology_map[1]) + 1);
 138         host->csr.topology_map[2] = cpu_to_be32(host->node_count << 16
 139                                                 | host->selfid_count);
 140         host->csr.topology_map[0] =
 141                 cpu_to_be32((host->selfid_count + 2) << 16
 142                             | csr_crc16(host->csr.topology_map + 1,
 143                                         host->selfid_count + 2));
 144
 145         host->csr.speed_map[1] =
 146                 cpu_to_be32(be32_to_cpu(host->csr.speed_map[1]) + 1);
 147         host->csr.speed_map[0] = cpu_to_be32(0x3f1 << 16
 148                                              | csr_crc16(host->csr.speed_map+1,
 149                                                          0x3f1));
 150 }
 151
 152 /*
 153  * HI == seconds (bits 0:2)
 154  * LO == fractions of a second in units of 125usec (bits 19:31)
 155  *
 156  * Convert SPLIT_TIMEOUT to jiffies.
 157  * The default and minimum as per 1394a-2000 clause 8.3.2.2.6 is 100ms.
 158  */
 159 static inline void calculate_expire(struct csr_control *csr)
 160 {
 161         unsigned long usecs =
 162                 (csr->split_timeout_hi & 0x07) * USEC_PER_SEC +
 163                 (csr->split_timeout_lo >> 19) * 125L;
 164
 165         csr->expire = usecs_to_jiffies(usecs > 100000L ? usecs : 100000L);
 166
 167         HPSB_VERBOSE("CSR: setting expire to %lu, HZ=%u", csr->expire, HZ);
 168 }
 169
 170
 171 static void add_host(struct hpsb_host *host)
 172 {
 173         struct csr1212_keyval *root;
 174         quadlet_t bus_info[CSR_BUS_INFO_SIZE];
 175
 176         hpsb_register_addrspace(&csr_highlevel, host, &reg_ops,
 177                                 CSR_REGISTER_BASE,
 178                                 CSR_REGISTER_BASE + CSR_CONFIG_ROM);
 179         hpsb_register_addrspace(&csr_highlevel, host, &config_rom_ops,
 180                                 CSR_REGISTER_BASE + CSR_CONFIG_ROM,
 181                                 CSR_REGISTER_BASE + CSR_CONFIG_ROM_END);
 182         if (fcp) {
 183                 hpsb_register_addrspace(&csr_highlevel, host, &fcp_ops,
 184                                         CSR_REGISTER_BASE + CSR_FCP_COMMAND,
 185                                         CSR_REGISTER_BASE + CSR_FCP_END);
 186         }
 187         hpsb_register_addrspace(&csr_highlevel, host, &map_ops,
 188                                 CSR_REGISTER_BASE + CSR_TOPOLOGY_MAP,
 189                                 CSR_REGISTER_BASE + CSR_TOPOLOGY_MAP_END);
 190         hpsb_register_addrspace(&csr_highlevel, host, &map_ops,
 191                                 CSR_REGISTER_BASE + CSR_SPEED_MAP,
 192                                 CSR_REGISTER_BASE + CSR_SPEED_MAP_END);
 193
 194         spin_lock_init(&host->csr.lock);
 195
 196         host->csr.state                 = 0;
 197         host->csr.node_ids              = 0;
 198         host->csr.split_timeout_hi      = 0;
 199         host->csr.split_timeout_lo      = 800 << 19;
 200         calculate_expire(&host->csr);
 201         host->csr.cycle_time            = 0;
 202         host->csr.bus_time              = 0;
 203         host->csr.bus_manager_id        = 0x3f;
 204         host->csr.bandwidth_available   = 4915;
 205         host->csr.channels_available_hi = 0xfffffffe;   /* pre-alloc ch 31 per 1394a-2000 */
 206         host->csr.channels_available_lo = ~0;
 207         host->csr.broadcast_channel = 0x80000000 | 31;
 208
 209         if (host->is_irm) {
 210                 if (host->driver->hw_csr_reg) {
 211                         host->driver->hw_csr_reg(host, 2, 0xfffffffe, ~0);
 212                 }
 213         }
 214
 215         if (host->csr.max_rec >= 9)
 216                 host->csr.max_rom = 2;
 217         else if (host->csr.max_rec >= 5)
 218                 host->csr.max_rom = 1;
 219         else
 220                 host->csr.max_rom = 0;
 221
 222         host->csr.generation = 2;
 223
 224         bus_info[1] = __constant_cpu_to_be32(0x31333934);
 225         bus_info[2] = cpu_to_be32((hpsb_disable_irm ? 0 : 1 << CSR_IRMC_SHIFT) |
 226                                   (1 << CSR_CMC_SHIFT) |
 227                                   (1 << CSR_ISC_SHIFT) |
 228                                   (0 << CSR_BMC_SHIFT) |
 229                                   (0 << CSR_PMC_SHIFT) |
 230                                   (host->csr.cyc_clk_acc << CSR_CYC_CLK_ACC_SHIFT) |
 231                                   (host->csr.max_rec << CSR_MAX_REC_SHIFT) |
 232                                   (host->csr.max_rom << CSR_MAX_ROM_SHIFT) |
 233                                   (host->csr.generation << CSR_GENERATION_SHIFT) |
 234                                   host->csr.lnk_spd);
 235
 236         bus_info[3] = cpu_to_be32(host->csr.guid_hi);
 237         bus_info[4] = cpu_to_be32(host->csr.guid_lo);
 238
 239         /* The hardware copy of the bus info block will be set later when a
 240          * bus reset is issued. */
 241
 242         csr1212_init_local_csr(host->csr.rom, bus_info, host->csr.max_rom);
 243
 244         root = host->csr.rom->root_kv;
 245
 246         if(csr1212_attach_keyval_to_directory(root, node_cap) != CSR1212_SUCCESS) {
 247                 HPSB_ERR("Failed to attach Node Capabilities to root directory");
 248         }
 249
 250         host->update_config_rom = 1;
 251 }
 252
 253 static void remove_host(struct hpsb_host *host)
 254 {
 255         quadlet_t bus_info[CSR_BUS_INFO_SIZE];
 256
 257         bus_info[1] = __constant_cpu_to_be32(0x31333934);
 258         bus_info[2] = cpu_to_be32((0 << CSR_IRMC_SHIFT) |
 259                                   (0 << CSR_CMC_SHIFT) |
 260                                   (0 << CSR_ISC_SHIFT) |
 261                                   (0 << CSR_BMC_SHIFT) |
 262                                   (0 << CSR_PMC_SHIFT) |
 263                                   (host->csr.cyc_clk_acc << CSR_CYC_CLK_ACC_SHIFT) |
 264                                   (host->csr.max_rec << CSR_MAX_REC_SHIFT) |
 265                                   (0 << CSR_MAX_ROM_SHIFT) |
 266                                   (0 << CSR_GENERATION_SHIFT) |
 267                                   host->csr.lnk_spd);
 268
 269         bus_info[3] = cpu_to_be32(host->csr.guid_hi);
 270         bus_info[4] = cpu_to_be32(host->csr.guid_lo);
 271
 272         csr1212_detach_keyval_from_directory(host->csr.rom->root_kv, node_cap);
 273
 274         csr1212_init_local_csr(host->csr.rom, bus_info, 0);
 275         host->update_config_rom = 1;
 276 }
 277
 278
 279 int hpsb_update_config_rom(struct hpsb_host *host, const quadlet_t *new_rom,
 280         size_t buffersize, unsigned char rom_version)
 281 {
 282         unsigned long flags;
 283         int ret;
 284
 285         HPSB_NOTICE("hpsb_update_config_rom() is deprecated");
 286
 287         spin_lock_irqsave(&host->csr.lock, flags);
 288         if (rom_version != host->csr.generation)
 289                 ret = -1;
 290         else if (buffersize > host->csr.rom->cache_head->size)
 291                 ret = -2;
 292         else {
 293                 /* Just overwrite the generated ConfigROM image with new data,
 294                  * it can be regenerated later. */
 295                 memcpy(host->csr.rom->cache_head->data, new_rom, buffersize);
 296                 host->csr.rom->cache_head->len = buffersize;
 297
 298                 if (host->driver->set_hw_config_rom)
 299                         host->driver->set_hw_config_rom(host, host->csr.rom->bus_info_data);
 300                 /* Increment the generation number to keep some sort of sync
 301                  * with the newer ConfigROM manipulation method. */
 302                 host->csr.generation++;
 303                 if (host->csr.generation > 0xf || host->csr.generation < 2)
 304                         host->csr.generation = 2;
 305                 ret=0;
 306         }
 307         spin_unlock_irqrestore(&host->csr.lock, flags);
 308         return ret;
 309 }
 310
 311
 312 /* Read topology / speed maps and configuration ROM */
 313 static int read_maps(struct hpsb_host *host, int nodeid, quadlet_t *buffer,
 314                      u64 addr, size_t length, u16 fl)
 315 {
 316         unsigned long flags;
 317         int csraddr = addr - CSR_REGISTER_BASE;
 318         const char *src;
 319
 320         spin_lock_irqsave(&host->csr.lock, flags);
 321
 322         if (csraddr < CSR_SPEED_MAP) {
 323                 src = ((char *)host->csr.topology_map) + csraddr
 324                         - CSR_TOPOLOGY_MAP;
 325         } else {
 326                 src = ((char *)host->csr.speed_map) + csraddr - CSR_SPEED_MAP;
 327         }
 328
 329         memcpy(buffer, src, length);
 330         spin_unlock_irqrestore(&host->csr.lock, flags);
 331         return RCODE_COMPLETE;
 332 }
 333
 334
 335 #define out if (--length == 0) break
 336
 337 static int read_regs(struct hpsb_host *host, int nodeid, quadlet_t *buf,
 338                      u64 addr, size_t length, u16 flags)
 339 {
 340         int csraddr = addr - CSR_REGISTER_BASE;
 341         int oldcycle;
 342         quadlet_t ret;
 343
 344         if ((csraddr | length) & 0x3)
 345                 return RCODE_TYPE_ERROR;
 346
 347         length /= 4;
 348
 349         switch (csraddr) {
 350         case CSR_STATE_CLEAR:
 351                 *(buf++) = cpu_to_be32(host->csr.state);
 352                 out;
 353         case CSR_STATE_SET:
 354                 *(buf++) = cpu_to_be32(host->csr.state);
 355                 out;
 356         case CSR_NODE_IDS:
 357                 *(buf++) = cpu_to_be32(host->csr.node_ids);
 358                 out;
 359
 360         case CSR_RESET_START:
 361                 return RCODE_TYPE_ERROR;
 362
 363                 /* address gap - handled by default below */
 364
 365         case CSR_SPLIT_TIMEOUT_HI:
 366                 *(buf++) = cpu_to_be32(host->csr.split_timeout_hi);
 367                 out;
 368         case CSR_SPLIT_TIMEOUT_LO:
 369                 *(buf++) = cpu_to_be32(host->csr.split_timeout_lo);
 370                 out;
 371
 372                 /* address gap */
 373                 return RCODE_ADDRESS_ERROR;
 374
 375         case CSR_CYCLE_TIME:
 376                 oldcycle = host->csr.cycle_time;
 377                 host->csr.cycle_time =
 378                         host->driver->devctl(host, GET_CYCLE_COUNTER, 0);
 379
 380                 if (oldcycle > host->csr.cycle_time) {
 381                         /* cycle time wrapped around */
 382                         host->csr.bus_time += 1 << 7;
 383                 }
 384                 *(buf++) = cpu_to_be32(host->csr.cycle_time);
 385                 out;
 386         case CSR_BUS_TIME:
 387                 oldcycle = host->csr.cycle_time;
 388                 host->csr.cycle_time =
 389                         host->driver->devctl(host, GET_CYCLE_COUNTER, 0);
 390
 391                 if (oldcycle > host->csr.cycle_time) {
 392                         /* cycle time wrapped around */
 393                         host->csr.bus_time += (1 << 7);
 394                 }
 395                 *(buf++) = cpu_to_be32(host->csr.bus_time
 396                                        | (host->csr.cycle_time >> 25));
 397                 out;
 398
 399                 /* address gap */
 400                 return RCODE_ADDRESS_ERROR;
 401
 402         case CSR_BUSY_TIMEOUT:
 403                 /* not yet implemented */
 404                 return RCODE_ADDRESS_ERROR;
 405
 406         case CSR_BUS_MANAGER_ID:
 407                 if (host->driver->hw_csr_reg)
 408                         ret = host->driver->hw_csr_reg(host, 0, 0, 0);
 409                 else
 410                         ret = host->csr.bus_manager_id;
 411
 412                 *(buf++) = cpu_to_be32(ret);
 413                 out;
 414         case CSR_BANDWIDTH_AVAILABLE:
 415                 if (host->driver->hw_csr_reg)
 416                         ret = host->driver->hw_csr_reg(host, 1, 0, 0);
 417                 else
 418                         ret = host->csr.bandwidth_available;
 419
 420                 *(buf++) = cpu_to_be32(ret);
 421                 out;
 422         case CSR_CHANNELS_AVAILABLE_HI:
 423                 if (host->driver->hw_csr_reg)
 424                         ret = host->driver->hw_csr_reg(host, 2, 0, 0);
 425                 else
 426                         ret = host->csr.channels_available_hi;
 427
 428                 *(buf++) = cpu_to_be32(ret);
 429                 out;
 430         case CSR_CHANNELS_AVAILABLE_LO:
 431                 if (host->driver->hw_csr_reg)
 432                         ret = host->driver->hw_csr_reg(host, 3, 0, 0);
 433                 else
 434                         ret = host->csr.channels_available_lo;
 435
 436                 *(buf++) = cpu_to_be32(ret);
 437                 out;
 438
 439         case CSR_BROADCAST_CHANNEL:
 440                 *(buf++) = cpu_to_be32(host->csr.broadcast_channel);
 441                 out;
 442
 443                 /* address gap to end - fall through to default */
 444         default:
 445                 return RCODE_ADDRESS_ERROR;
 446         }
 447
 448         return RCODE_COMPLETE;
 449 }
 450
 451 static int write_regs(struct hpsb_host *host, int nodeid, int destid,
 452                       quadlet_t *data, u64 addr, size_t length, u16 flags)
 453 {
 454         int csraddr = addr - CSR_REGISTER_BASE;
 455
 456         if ((csraddr | length) & 0x3)
 457                 return RCODE_TYPE_ERROR;
 458
 459         length /= 4;
 460
 461         switch (csraddr) {
 462         case CSR_STATE_CLEAR:
 463                 /* FIXME FIXME FIXME */
 464                 printk("doh, someone wants to mess with state clear\n");
 465                 out;
 466         case CSR_STATE_SET:
 467                 printk("doh, someone wants to mess with state set\n");
 468                 out;
 469
 470         case CSR_NODE_IDS:
 471                 host->csr.node_ids &= NODE_MASK << 16;
 472                 host->csr.node_ids |= be32_to_cpu(*(data++)) & (BUS_MASK << 16);
 473                 host->node_id = host->csr.node_ids >> 16;
 474                 host->driver->devctl(host, SET_BUS_ID, host->node_id >> 6);
 475                 out;
 476
 477         case CSR_RESET_START:
 478                 /* FIXME - perform command reset */
 479                 out;
 480
 481                 /* address gap */
 482                 return RCODE_ADDRESS_ERROR;
 483
 484         case CSR_SPLIT_TIMEOUT_HI:
 485                 host->csr.split_timeout_hi =
 486                         be32_to_cpu(*(data++)) & 0x00000007;
 487                 calculate_expire(&host->csr);
 488                 out;
 489         case CSR_SPLIT_TIMEOUT_LO:
 490                 host->csr.split_timeout_lo =
 491                         be32_to_cpu(*(data++)) & 0xfff80000;
 492                 calculate_expire(&host->csr);
 493                 out;
 494
 495                 /* address gap */
 496                 return RCODE_ADDRESS_ERROR;
 497
 498         case CSR_CYCLE_TIME:
 499                 /* should only be set by cycle start packet, automatically */
 500                 host->csr.cycle_time = be32_to_cpu(*data);
 501                 host->driver->devctl(host, SET_CYCLE_COUNTER,
 502                                        be32_to_cpu(*(data++)));
 503                 out;
 504         case CSR_BUS_TIME:
 505                 host->csr.bus_time = be32_to_cpu(*(data++)) & 0xffffff80;
 506                 out;
 507
 508                 /* address gap */
 509                 return RCODE_ADDRESS_ERROR;
 510
 511         case CSR_BUSY_TIMEOUT:
 512                 /* not yet implemented */
 513                 return RCODE_ADDRESS_ERROR;
 514
 515         case CSR_BUS_MANAGER_ID:
 516         case CSR_BANDWIDTH_AVAILABLE:
 517         case CSR_CHANNELS_AVAILABLE_HI:
 518         case CSR_CHANNELS_AVAILABLE_LO:
 519                 /* these are not writable, only lockable */
 520                 return RCODE_TYPE_ERROR;
 521
 522         case CSR_BROADCAST_CHANNEL:
 523                 /* only the valid bit can be written */
 524                 host->csr.broadcast_channel = (host->csr.broadcast_channel & ~0x40000000)
 525                         | (be32_to_cpu(*data) & 0x40000000);
 526                 out;
 527
 528                 /* address gap to end - fall through */
 529         default:
 530                 return RCODE_ADDRESS_ERROR;
 531         }
 532
 533         return RCODE_COMPLETE;
 534 }
 535
 536 #undef out
 537
 538
 539 static int lock_regs(struct hpsb_host *host, int nodeid, quadlet_t *store,
 540                      u64 addr, quadlet_t data, quadlet_t arg, int extcode, u16 fl)
 541 {
 542         int csraddr = addr - CSR_REGISTER_BASE;
 543         unsigned long flags;
 544         quadlet_t *regptr = NULL;
 545
 546         if (csraddr & 0x3)
 547                 return RCODE_TYPE_ERROR;
 548
 549         if (csraddr < CSR_BUS_MANAGER_ID || csraddr > CSR_CHANNELS_AVAILABLE_LO
 550             || extcode != EXTCODE_COMPARE_SWAP)
 551                 goto unsupported_lockreq;
 552
 553         data = be32_to_cpu(data);
 554         arg = be32_to_cpu(arg);
 555
 556         /* Is somebody releasing the broadcast_channel on us? */
 557         if (csraddr == CSR_CHANNELS_AVAILABLE_HI && (data & 0x1)) {
 558                 /* Note: this is may not be the right way to handle
 559                  * the problem, so we should look into the proper way
 560                  * eventually. */
 561                 HPSB_WARN("Node [" NODE_BUS_FMT "] wants to release "
 562                           "broadcast channel 31.  Ignoring.",
 563                           NODE_BUS_ARGS(host, nodeid));
 564
 565                 data &= ~0x1;   /* keep broadcast channel allocated */
 566         }
 567
 568         if (host->driver->hw_csr_reg) {
 569                 quadlet_t old;
 570
 571                 old = host->driver->
 572                         hw_csr_reg(host, (csraddr - CSR_BUS_MANAGER_ID) >> 2,
 573                                    data, arg);
 574
 575                 *store = cpu_to_be32(old);
 576                 return RCODE_COMPLETE;
 577         }
 578
 579         spin_lock_irqsave(&host->csr.lock, flags);
 580
 581         switch (csraddr) {
 582         case CSR_BUS_MANAGER_ID:
 583                 regptr = &host->csr.bus_manager_id;
 584                 *store = cpu_to_be32(*regptr);
 585                 if (*regptr == arg)
 586                         *regptr = data;
 587                 break;
 588
 589         case CSR_BANDWIDTH_AVAILABLE:
 590         {
 591                 quadlet_t bandwidth;
 592                 quadlet_t old;
 593                 quadlet_t new;
 594
 595                 regptr = &host->csr.bandwidth_available;
 596                 old = *regptr;
 597
 598                 /* bandwidth available algorithm adapted from IEEE 1394a-2000 spec */
 599                 if (arg > 0x1fff) {
 600                         *store = cpu_to_be32(old);      /* change nothing */
 601                         break;
 602                 }
 603                 data &= 0x1fff;
 604                 if (arg >= data) {
 605                         /* allocate bandwidth */
 606                         bandwidth = arg - data;
 607                         if (old >= bandwidth) {
 608                                 new = old - bandwidth;
 609                                 *store = cpu_to_be32(arg);
 610                                 *regptr = new;
 611                         } else {
 612                                 *store = cpu_to_be32(old);
 613                         }
 614                 } else {
 615                         /* deallocate bandwidth */
 616                         bandwidth = data - arg;
 617                         if (old + bandwidth < 0x2000) {
 618                                 new = old + bandwidth;
 619                                 *store = cpu_to_be32(arg);
 620                                 *regptr = new;
 621                         } else {
 622                                 *store = cpu_to_be32(old);
 623                         }
 624                 }
 625                 break;
 626         }
 627
 628         case CSR_CHANNELS_AVAILABLE_HI:
 629         {
 630                 /* Lock algorithm for CHANNELS_AVAILABLE as recommended by 1394a-2000 */
 631                 quadlet_t affected_channels = arg ^ data;
 632
 633                 regptr = &host->csr.channels_available_hi;
 634
 635                 if ((arg & affected_channels) == (*regptr & affected_channels)) {
 636                         *regptr ^= affected_channels;
 637                         *store = cpu_to_be32(arg);
 638                 } else {
 639                         *store = cpu_to_be32(*regptr);
 640                 }
 641
 642                 break;
 643         }
 644
 645         case CSR_CHANNELS_AVAILABLE_LO:
 646         {
 647                 /* Lock algorithm for CHANNELS_AVAILABLE as recommended by 1394a-2000 */
 648                 quadlet_t affected_channels = arg ^ data;
 649
 650                 regptr = &host->csr.channels_available_lo;
 651
 652                 if ((arg & affected_channels) == (*regptr & affected_channels)) {
 653                         *regptr ^= affected_channels;
 654                         *store = cpu_to_be32(arg);
 655                 } else {
 656                         *store = cpu_to_be32(*regptr);
 657                 }
 658                 break;
 659         }
 660         }
 661
 662         spin_unlock_irqrestore(&host->csr.lock, flags);
 663
 664         return RCODE_COMPLETE;
 665
 666  unsupported_lockreq:
 667         switch (csraddr) {
 668         case CSR_STATE_CLEAR:
 669         case CSR_STATE_SET:
 670         case CSR_RESET_START:
 671         case CSR_NODE_IDS:
 672         case CSR_SPLIT_TIMEOUT_HI:
 673         case CSR_SPLIT_TIMEOUT_LO:
 674         case CSR_CYCLE_TIME:
 675         case CSR_BUS_TIME:
 676         case CSR_BROADCAST_CHANNEL:
 677                 return RCODE_TYPE_ERROR;
 678
 679         case CSR_BUSY_TIMEOUT:
 680                 /* not yet implemented - fall through */
 681         default:
 682                 return RCODE_ADDRESS_ERROR;
 683         }
 684 }
 685
 686 static int lock64_regs(struct hpsb_host *host, int nodeid, octlet_t * store,
 687                        u64 addr, octlet_t data, octlet_t arg, int extcode, u16 fl)
 688 {
 689         int csraddr = addr - CSR_REGISTER_BASE;
 690         unsigned long flags;
 691
 692         data = be64_to_cpu(data);
 693         arg = be64_to_cpu(arg);
 694
 695         if (csraddr & 0x3)
 696                 return RCODE_TYPE_ERROR;
 697
 698         if (csraddr != CSR_CHANNELS_AVAILABLE
 699             || extcode != EXTCODE_COMPARE_SWAP)
 700                 goto unsupported_lock64req;
 701
 702         /* Is somebody releasing the broadcast_channel on us? */
 703         if (csraddr == CSR_CHANNELS_AVAILABLE_HI && (data & 0x100000000ULL)) {
 704                 /* Note: this is may not be the right way to handle
 705                  * the problem, so we should look into the proper way
 706                  * eventually. */
 707                 HPSB_WARN("Node [" NODE_BUS_FMT "] wants to release "
 708                           "broadcast channel 31.  Ignoring.",
 709                           NODE_BUS_ARGS(host, nodeid));
 710
 711                 data &= ~0x100000000ULL;        /* keep broadcast channel allocated */
 712         }
 713
 714         if (host->driver->hw_csr_reg) {
 715                 quadlet_t data_hi, data_lo;
 716                 quadlet_t arg_hi, arg_lo;
 717                 quadlet_t old_hi, old_lo;
 718
 719                 data_hi = data >> 32;
 720                 data_lo = data & 0xFFFFFFFF;
 721                 arg_hi = arg >> 32;
 722                 arg_lo = arg & 0xFFFFFFFF;
 723
 724                 old_hi = host->driver->hw_csr_reg(host, (csraddr - CSR_BUS_MANAGER_ID) >> 2,
 725                                                   data_hi, arg_hi);
 726
 727                 old_lo = host->driver->hw_csr_reg(host, ((csraddr + 4) - CSR_BUS_MANAGER_ID) >> 2,
 728                                                   data_lo, arg_lo);
 729
 730                 *store = cpu_to_be64(((octlet_t)old_hi << 32) | old_lo);
 731         } else {
 732                 octlet_t old;
 733                 octlet_t affected_channels = arg ^ data;
 734
 735                 spin_lock_irqsave(&host->csr.lock, flags);
 736
 737                 old = ((octlet_t)host->csr.channels_available_hi << 32) | host->csr.channels_available_lo;
 738
 739                 if ((arg & affected_channels) == (old & affected_channels)) {
 740                         host->csr.channels_available_hi ^= (affected_channels >> 32);
 741                         host->csr.channels_available_lo ^= (affected_channels & 0xffffffff);
 742                         *store = cpu_to_be64(arg);
 743                 } else {
 744                         *store = cpu_to_be64(old);
 745                 }
 746
 747                 spin_unlock_irqrestore(&host->csr.lock, flags);
 748         }
 749
 750         /* Is somebody erroneously releasing the broadcast_channel on us? */
 751         if (host->csr.channels_available_hi & 0x1)
 752                 host->csr.channels_available_hi &= ~0x1;
 753
 754         return RCODE_COMPLETE;
 755
 756  unsupported_lock64req:
 757         switch (csraddr) {
 758         case CSR_STATE_CLEAR:
 759         case CSR_STATE_SET:
 760         case CSR_RESET_START:
 761         case CSR_NODE_IDS:
 762         case CSR_SPLIT_TIMEOUT_HI:
 763         case CSR_SPLIT_TIMEOUT_LO:
 764         case CSR_CYCLE_TIME:
 765         case CSR_BUS_TIME:
 766         case CSR_BUS_MANAGER_ID:
 767         case CSR_BROADCAST_CHANNEL:
 768         case CSR_BUSY_TIMEOUT:
 769         case CSR_BANDWIDTH_AVAILABLE:
 770                 return RCODE_TYPE_ERROR;
 771
 772         default:
 773                 return RCODE_ADDRESS_ERROR;
 774         }
 775 }
 776
 777 static int write_fcp(struct hpsb_host *host, int nodeid, int dest,
 778                      quadlet_t *data, u64 addr, size_t length, u16 flags)
 779 {
 780         int csraddr = addr - CSR_REGISTER_BASE;
 781
 782         if (length > 512)
 783                 return RCODE_TYPE_ERROR;
 784
 785         switch (csraddr) {
 786         case CSR_FCP_COMMAND:
 787                 highlevel_fcp_request(host, nodeid, 0, (u8 *)data, length);
 788                 break;
 789         case CSR_FCP_RESPONSE:
 790                 highlevel_fcp_request(host, nodeid, 1, (u8 *)data, length);
 791                 break;
 792         default:
 793                 return RCODE_TYPE_ERROR;
 794         }
 795
 796         return RCODE_COMPLETE;
 797 }
 798
 799 static int read_config_rom(struct hpsb_host *host, int nodeid, quadlet_t *buffer,
 800                            u64 addr, size_t length, u16 fl)
 801 {
 802         u32 offset = addr - CSR1212_REGISTER_SPACE_BASE;
 803
 804         if (csr1212_read(host->csr.rom, offset, buffer, length) == CSR1212_SUCCESS)
 805                 return RCODE_COMPLETE;
 806         else
 807                 return RCODE_ADDRESS_ERROR;
 808 }
 809
 810 static u64 allocate_addr_range(u64 size, u32 alignment, void *__host)
 811 {
 812         struct hpsb_host *host = (struct hpsb_host*)__host;
 813
 814         return hpsb_allocate_and_register_addrspace(&csr_highlevel,
 815                                                     host,
 816                                                     &config_rom_ops,
 817                                                     size, alignment,
 818                                                     CSR1212_UNITS_SPACE_BASE,
 819                                                     CSR1212_UNITS_SPACE_END);
 820 }
 821
 822 static void release_addr_range(u64 addr, void *__host)
 823 {
 824         struct hpsb_host *host = (struct hpsb_host*)__host;
 825         hpsb_unregister_addrspace(&csr_highlevel, host, addr);
 826 }
 827
 828
 829 int init_csr(void)
 830 {
 831         node_cap = csr1212_new_immediate(CSR1212_KV_ID_NODE_CAPABILITIES, 0x0083c0);
 832         if (!node_cap) {
 833                 HPSB_ERR("Failed to allocate memory for Node Capabilties ConfigROM entry!");
 834                 return -ENOMEM;
 835         }
 836
 837         hpsb_register_highlevel(&csr_highlevel);
 838
 839         return 0;
 840 }
 841
 842 void cleanup_csr(void)
 843 {
 844         if (node_cap)
 845                 csr1212_release_keyval(node_cap);
 846         hpsb_unregister_highlevel(&csr_highlevel);
 847 }