err.no 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         be32_add_cpu(&host->csr.topology_map[1], 1);
 137         host->csr.topology_map[2] = cpu_to_be32(host->node_count << 16
 138                                                 | host->selfid_count);
 139         host->csr.topology_map[0] =
 140                 cpu_to_be32((host->selfid_count + 2) << 16
 141                             | csr_crc16(host->csr.topology_map + 1,
 142                                         host->selfid_count + 2));
 143
 144         be32_add_cpu(&host->csr.speed_map[1], 1);
 145         host->csr.speed_map[0] = cpu_to_be32(0x3f1 << 16
 146                                              | csr_crc16(host->csr.speed_map+1,
 147                                                          0x3f1));
 148 }
 149
 150 /*
 151  * HI == seconds (bits 0:2)
 152  * LO == fractions of a second in units of 125usec (bits 19:31)
 153  *
 154  * Convert SPLIT_TIMEOUT to jiffies.
 155  * The default and minimum as per 1394a-2000 clause 8.3.2.2.6 is 100ms.
 156  */
 157 static inline void calculate_expire(struct csr_control *csr)
 158 {
 159         unsigned int usecs = (csr->split_timeout_hi & 7) * 1000000 +
 160                              (csr->split_timeout_lo >> 19) * 125;
 161
 162         csr->expire = usecs_to_jiffies(usecs > 100000 ? usecs : 100000);
 163         HPSB_VERBOSE("CSR: setting expire to %lu, HZ=%u", csr->expire, HZ);
 164 }
 165
 166
 167 static void add_host(struct hpsb_host *host)
 168 {
 169         struct csr1212_keyval *root;
 170         quadlet_t bus_info[CSR_BUS_INFO_SIZE];
 171
 172         hpsb_register_addrspace(&csr_highlevel, host, &reg_ops,
 173                                 CSR_REGISTER_BASE,
 174                                 CSR_REGISTER_BASE + CSR_CONFIG_ROM);
 175         hpsb_register_addrspace(&csr_highlevel, host, &config_rom_ops,
 176                                 CSR_REGISTER_BASE + CSR_CONFIG_ROM,
 177                                 CSR_REGISTER_BASE + CSR_CONFIG_ROM_END);
 178         if (fcp) {
 179                 hpsb_register_addrspace(&csr_highlevel, host, &fcp_ops,
 180                                         CSR_REGISTER_BASE + CSR_FCP_COMMAND,
 181                                         CSR_REGISTER_BASE + CSR_FCP_END);
 182         }
 183         hpsb_register_addrspace(&csr_highlevel, host, &map_ops,
 184                                 CSR_REGISTER_BASE + CSR_TOPOLOGY_MAP,
 185                                 CSR_REGISTER_BASE + CSR_TOPOLOGY_MAP_END);
 186         hpsb_register_addrspace(&csr_highlevel, host, &map_ops,
 187                                 CSR_REGISTER_BASE + CSR_SPEED_MAP,
 188                                 CSR_REGISTER_BASE + CSR_SPEED_MAP_END);
 189
 190         spin_lock_init(&host->csr.lock);
 191
 192         host->csr.state                 = 0;
 193         host->csr.node_ids              = 0;
 194         host->csr.split_timeout_hi      = 0;
 195         host->csr.split_timeout_lo      = 800 << 19;
 196         calculate_expire(&host->csr);
 197         host->csr.cycle_time            = 0;
 198         host->csr.bus_time              = 0;
 199         host->csr.bus_manager_id        = 0x3f;
 200         host->csr.bandwidth_available   = 4915;
 201         host->csr.channels_available_hi = 0xfffffffe;   /* pre-alloc ch 31 per 1394a-2000 */
 202         host->csr.channels_available_lo = ~0;
 203         host->csr.broadcast_channel = 0x80000000 | 31;
 204
 205         if (host->is_irm) {
 206                 if (host->driver->hw_csr_reg) {
 207                         host->driver->hw_csr_reg(host, 2, 0xfffffffe, ~0);
 208                 }
 209         }
 210
 211         if (host->csr.max_rec >= 9)
 212                 host->csr.max_rom = 2;
 213         else if (host->csr.max_rec >= 5)
 214                 host->csr.max_rom = 1;
 215         else
 216                 host->csr.max_rom = 0;
 217
 218         host->csr.generation = 2;
 219
 220         bus_info[1] = __constant_cpu_to_be32(0x31333934);
 221         bus_info[2] = cpu_to_be32((hpsb_disable_irm ? 0 : 1 << CSR_IRMC_SHIFT) |
 222                                   (1 << CSR_CMC_SHIFT) |
 223                                   (1 << CSR_ISC_SHIFT) |
 224                                   (0 << CSR_BMC_SHIFT) |
 225                                   (0 << CSR_PMC_SHIFT) |
 226                                   (host->csr.cyc_clk_acc << CSR_CYC_CLK_ACC_SHIFT) |
 227                                   (host->csr.max_rec << CSR_MAX_REC_SHIFT) |
 228                                   (host->csr.max_rom << CSR_MAX_ROM_SHIFT) |
 229                                   (host->csr.generation << CSR_GENERATION_SHIFT) |
 230                                   host->csr.lnk_spd);
 231
 232         bus_info[3] = cpu_to_be32(host->csr.guid_hi);
 233         bus_info[4] = cpu_to_be32(host->csr.guid_lo);
 234
 235         /* The hardware copy of the bus info block will be set later when a
 236          * bus reset is issued. */
 237
 238         csr1212_init_local_csr(host->csr.rom, bus_info, host->csr.max_rom);
 239
 240         root = host->csr.rom->root_kv;
 241
 242         if(csr1212_attach_keyval_to_directory(root, node_cap) != CSR1212_SUCCESS) {
 243                 HPSB_ERR("Failed to attach Node Capabilities to root directory");
 244         }
 245
 246         host->update_config_rom = 1;
 247 }
 248
 249 static void remove_host(struct hpsb_host *host)
 250 {
 251         quadlet_t bus_info[CSR_BUS_INFO_SIZE];
 252
 253         bus_info[1] = __constant_cpu_to_be32(0x31333934);
 254         bus_info[2] = cpu_to_be32((0 << CSR_IRMC_SHIFT) |
 255                                   (0 << CSR_CMC_SHIFT) |
 256                                   (0 << CSR_ISC_SHIFT) |
 257                                   (0 << CSR_BMC_SHIFT) |
 258                                   (0 << CSR_PMC_SHIFT) |
 259                                   (host->csr.cyc_clk_acc << CSR_CYC_CLK_ACC_SHIFT) |
 260                                   (host->csr.max_rec << CSR_MAX_REC_SHIFT) |
 261                                   (0 << CSR_MAX_ROM_SHIFT) |
 262                                   (0 << CSR_GENERATION_SHIFT) |
 263                                   host->csr.lnk_spd);
 264
 265         bus_info[3] = cpu_to_be32(host->csr.guid_hi);
 266         bus_info[4] = cpu_to_be32(host->csr.guid_lo);
 267
 268         csr1212_detach_keyval_from_directory(host->csr.rom->root_kv, node_cap);
 269
 270         csr1212_init_local_csr(host->csr.rom, bus_info, 0);
 271         host->update_config_rom = 1;
 272 }
 273
 274
 275 int hpsb_update_config_rom(struct hpsb_host *host, const quadlet_t *new_rom,
 276         size_t buffersize, unsigned char rom_version)
 277 {
 278         unsigned long flags;
 279         int ret;
 280
 281         HPSB_NOTICE("hpsb_update_config_rom() is deprecated");
 282
 283         spin_lock_irqsave(&host->csr.lock, flags);
 284         if (rom_version != host->csr.generation)
 285                 ret = -1;
 286         else if (buffersize > host->csr.rom->cache_head->size)
 287                 ret = -2;
 288         else {
 289                 /* Just overwrite the generated ConfigROM image with new data,
 290                  * it can be regenerated later. */
 291                 memcpy(host->csr.rom->cache_head->data, new_rom, buffersize);
 292                 host->csr.rom->cache_head->len = buffersize;
 293
 294                 if (host->driver->set_hw_config_rom)
 295                         host->driver->set_hw_config_rom(host, host->csr.rom->bus_info_data);
 296                 /* Increment the generation number to keep some sort of sync
 297                  * with the newer ConfigROM manipulation method. */
 298                 host->csr.generation++;
 299                 if (host->csr.generation > 0xf || host->csr.generation < 2)
 300                         host->csr.generation = 2;
 301                 ret=0;
 302         }
 303         spin_unlock_irqrestore(&host->csr.lock, flags);
 304         return ret;
 305 }
 306
 307
 308 /* Read topology / speed maps and configuration ROM */
 309 static int read_maps(struct hpsb_host *host, int nodeid, quadlet_t *buffer,
 310                      u64 addr, size_t length, u16 fl)
 311 {
 312         unsigned long flags;
 313         int csraddr = addr - CSR_REGISTER_BASE;
 314         const char *src;
 315
 316         spin_lock_irqsave(&host->csr.lock, flags);
 317
 318         if (csraddr < CSR_SPEED_MAP) {
 319                 src = ((char *)host->csr.topology_map) + csraddr
 320                         - CSR_TOPOLOGY_MAP;
 321         } else {
 322                 src = ((char *)host->csr.speed_map) + csraddr - CSR_SPEED_MAP;
 323         }
 324
 325         memcpy(buffer, src, length);
 326         spin_unlock_irqrestore(&host->csr.lock, flags);
 327         return RCODE_COMPLETE;
 328 }
 329
 330
 331 #define out if (--length == 0) break
 332
 333 static int read_regs(struct hpsb_host *host, int nodeid, quadlet_t *buf,
 334                      u64 addr, size_t length, u16 flags)
 335 {
 336         int csraddr = addr - CSR_REGISTER_BASE;
 337         int oldcycle;
 338         quadlet_t ret;
 339
 340         if ((csraddr | length) & 0x3)
 341                 return RCODE_TYPE_ERROR;
 342
 343         length /= 4;
 344
 345         switch (csraddr) {
 346         case CSR_STATE_CLEAR:
 347                 *(buf++) = cpu_to_be32(host->csr.state);
 348                 out;
 349         case CSR_STATE_SET:
 350                 *(buf++) = cpu_to_be32(host->csr.state);
 351                 out;
 352         case CSR_NODE_IDS:
 353                 *(buf++) = cpu_to_be32(host->csr.node_ids);
 354                 out;
 355
 356         case CSR_RESET_START:
 357                 return RCODE_TYPE_ERROR;
 358
 359                 /* address gap - handled by default below */
 360
 361         case CSR_SPLIT_TIMEOUT_HI:
 362                 *(buf++) = cpu_to_be32(host->csr.split_timeout_hi);
 363                 out;
 364         case CSR_SPLIT_TIMEOUT_LO:
 365                 *(buf++) = cpu_to_be32(host->csr.split_timeout_lo);
 366                 out;
 367
 368                 /* address gap */
 369                 return RCODE_ADDRESS_ERROR;
 370
 371         case CSR_CYCLE_TIME:
 372                 oldcycle = host->csr.cycle_time;
 373                 host->csr.cycle_time =
 374                         host->driver->devctl(host, GET_CYCLE_COUNTER, 0);
 375
 376                 if (oldcycle > host->csr.cycle_time) {
 377                         /* cycle time wrapped around */
 378                         host->csr.bus_time += 1 << 7;
 379                 }
 380                 *(buf++) = cpu_to_be32(host->csr.cycle_time);
 381                 out;
 382         case CSR_BUS_TIME:
 383                 oldcycle = host->csr.cycle_time;
 384                 host->csr.cycle_time =
 385                         host->driver->devctl(host, GET_CYCLE_COUNTER, 0);
 386
 387                 if (oldcycle > host->csr.cycle_time) {
 388                         /* cycle time wrapped around */
 389                         host->csr.bus_time += (1 << 7);
 390                 }
 391                 *(buf++) = cpu_to_be32(host->csr.bus_time
 392                                        | (host->csr.cycle_time >> 25));
 393                 out;
 394
 395                 /* address gap */
 396                 return RCODE_ADDRESS_ERROR;
 397
 398         case CSR_BUSY_TIMEOUT:
 399                 /* not yet implemented */
 400                 return RCODE_ADDRESS_ERROR;
 401
 402         case CSR_BUS_MANAGER_ID:
 403                 if (host->driver->hw_csr_reg)
 404                         ret = host->driver->hw_csr_reg(host, 0, 0, 0);
 405                 else
 406                         ret = host->csr.bus_manager_id;
 407
 408                 *(buf++) = cpu_to_be32(ret);
 409                 out;
 410         case CSR_BANDWIDTH_AVAILABLE:
 411                 if (host->driver->hw_csr_reg)
 412                         ret = host->driver->hw_csr_reg(host, 1, 0, 0);
 413                 else
 414                         ret = host->csr.bandwidth_available;
 415
 416                 *(buf++) = cpu_to_be32(ret);
 417                 out;
 418         case CSR_CHANNELS_AVAILABLE_HI:
 419                 if (host->driver->hw_csr_reg)
 420                         ret = host->driver->hw_csr_reg(host, 2, 0, 0);
 421                 else
 422                         ret = host->csr.channels_available_hi;
 423
 424                 *(buf++) = cpu_to_be32(ret);
 425                 out;
 426         case CSR_CHANNELS_AVAILABLE_LO:
 427                 if (host->driver->hw_csr_reg)
 428                         ret = host->driver->hw_csr_reg(host, 3, 0, 0);
 429                 else
 430                         ret = host->csr.channels_available_lo;
 431
 432                 *(buf++) = cpu_to_be32(ret);
 433                 out;
 434
 435         case CSR_BROADCAST_CHANNEL:
 436                 *(buf++) = cpu_to_be32(host->csr.broadcast_channel);
 437                 out;
 438
 439                 /* address gap to end - fall through to default */
 440         default:
 441                 return RCODE_ADDRESS_ERROR;
 442         }
 443
 444         return RCODE_COMPLETE;
 445 }
 446
 447 static int write_regs(struct hpsb_host *host, int nodeid, int destid,
 448                       quadlet_t *data, u64 addr, size_t length, u16 flags)
 449 {
 450         int csraddr = addr - CSR_REGISTER_BASE;
 451
 452         if ((csraddr | length) & 0x3)
 453                 return RCODE_TYPE_ERROR;
 454
 455         length /= 4;
 456
 457         switch (csraddr) {
 458         case CSR_STATE_CLEAR:
 459                 /* FIXME FIXME FIXME */
 460                 printk("doh, someone wants to mess with state clear\n");
 461                 out;
 462         case CSR_STATE_SET:
 463                 printk("doh, someone wants to mess with state set\n");
 464                 out;
 465
 466         case CSR_NODE_IDS:
 467                 host->csr.node_ids &= NODE_MASK << 16;
 468                 host->csr.node_ids |= be32_to_cpu(*(data++)) & (BUS_MASK << 16);
 469                 host->node_id = host->csr.node_ids >> 16;
 470                 host->driver->devctl(host, SET_BUS_ID, host->node_id >> 6);
 471                 out;
 472
 473         case CSR_RESET_START:
 474                 /* FIXME - perform command reset */
 475                 out;
 476
 477                 /* address gap */
 478                 return RCODE_ADDRESS_ERROR;
 479
 480         case CSR_SPLIT_TIMEOUT_HI:
 481                 host->csr.split_timeout_hi =
 482                         be32_to_cpu(*(data++)) & 0x00000007;
 483                 calculate_expire(&host->csr);
 484                 out;
 485         case CSR_SPLIT_TIMEOUT_LO:
 486                 host->csr.split_timeout_lo =
 487                         be32_to_cpu(*(data++)) & 0xfff80000;
 488                 calculate_expire(&host->csr);
 489                 out;
 490
 491                 /* address gap */
 492                 return RCODE_ADDRESS_ERROR;
 493
 494         case CSR_CYCLE_TIME:
 495                 /* should only be set by cycle start packet, automatically */
 496                 host->csr.cycle_time = be32_to_cpu(*data);
 497                 host->driver->devctl(host, SET_CYCLE_COUNTER,
 498                                        be32_to_cpu(*(data++)));
 499                 out;
 500         case CSR_BUS_TIME:
 501                 host->csr.bus_time = be32_to_cpu(*(data++)) & 0xffffff80;
 502                 out;
 503
 504                 /* address gap */
 505                 return RCODE_ADDRESS_ERROR;
 506
 507         case CSR_BUSY_TIMEOUT:
 508                 /* not yet implemented */
 509                 return RCODE_ADDRESS_ERROR;
 510
 511         case CSR_BUS_MANAGER_ID:
 512         case CSR_BANDWIDTH_AVAILABLE:
 513         case CSR_CHANNELS_AVAILABLE_HI:
 514         case CSR_CHANNELS_AVAILABLE_LO:
 515                 /* these are not writable, only lockable */
 516                 return RCODE_TYPE_ERROR;
 517
 518         case CSR_BROADCAST_CHANNEL:
 519                 /* only the valid bit can be written */
 520                 host->csr.broadcast_channel = (host->csr.broadcast_channel & ~0x40000000)
 521                         | (be32_to_cpu(*data) & 0x40000000);
 522                 out;
 523
 524                 /* address gap to end - fall through */
 525         default:
 526                 return RCODE_ADDRESS_ERROR;
 527         }
 528
 529         return RCODE_COMPLETE;
 530 }
 531
 532 #undef out
 533
 534
 535 static int lock_regs(struct hpsb_host *host, int nodeid, quadlet_t *store,
 536                      u64 addr, quadlet_t data, quadlet_t arg, int extcode, u16 fl)
 537 {
 538         int csraddr = addr - CSR_REGISTER_BASE;
 539         unsigned long flags;
 540         quadlet_t *regptr = NULL;
 541
 542         if (csraddr & 0x3)
 543                 return RCODE_TYPE_ERROR;
 544
 545         if (csraddr < CSR_BUS_MANAGER_ID || csraddr > CSR_CHANNELS_AVAILABLE_LO
 546             || extcode != EXTCODE_COMPARE_SWAP)
 547                 goto unsupported_lockreq;
 548
 549         data = be32_to_cpu(data);
 550         arg = be32_to_cpu(arg);
 551
 552         /* Is somebody releasing the broadcast_channel on us? */
 553         if (csraddr == CSR_CHANNELS_AVAILABLE_HI && (data & 0x1)) {
 554                 /* Note: this is may not be the right way to handle
 555                  * the problem, so we should look into the proper way
 556                  * eventually. */
 557                 HPSB_WARN("Node [" NODE_BUS_FMT "] wants to release "
 558                           "broadcast channel 31.  Ignoring.",
 559                           NODE_BUS_ARGS(host, nodeid));
 560
 561                 data &= ~0x1;   /* keep broadcast channel allocated */
 562         }
 563
 564         if (host->driver->hw_csr_reg) {
 565                 quadlet_t old;
 566
 567                 old = host->driver->
 568                         hw_csr_reg(host, (csraddr - CSR_BUS_MANAGER_ID) >> 2,
 569                                    data, arg);
 570
 571                 *store = cpu_to_be32(old);
 572                 return RCODE_COMPLETE;
 573         }
 574
 575         spin_lock_irqsave(&host->csr.lock, flags);
 576
 577         switch (csraddr) {
 578         case CSR_BUS_MANAGER_ID:
 579                 regptr = &host->csr.bus_manager_id;
 580                 *store = cpu_to_be32(*regptr);
 581                 if (*regptr == arg)
 582                         *regptr = data;
 583                 break;
 584
 585         case CSR_BANDWIDTH_AVAILABLE:
 586         {
 587                 quadlet_t bandwidth;
 588                 quadlet_t old;
 589                 quadlet_t new;
 590
 591                 regptr = &host->csr.bandwidth_available;
 592                 old = *regptr;
 593
 594                 /* bandwidth available algorithm adapted from IEEE 1394a-2000 spec */
 595                 if (arg > 0x1fff) {
 596                         *store = cpu_to_be32(old);      /* change nothing */
 597                         break;
 598                 }
 599                 data &= 0x1fff;
 600                 if (arg >= data) {
 601                         /* allocate bandwidth */
 602                         bandwidth = arg - data;
 603                         if (old >= bandwidth) {
 604                                 new = old - bandwidth;
 605                                 *store = cpu_to_be32(arg);
 606                                 *regptr = new;
 607                         } else {
 608                                 *store = cpu_to_be32(old);
 609                         }
 610                 } else {
 611                         /* deallocate bandwidth */
 612                         bandwidth = data - arg;
 613                         if (old + bandwidth < 0x2000) {
 614                                 new = old + bandwidth;
 615                                 *store = cpu_to_be32(arg);
 616                                 *regptr = new;
 617                         } else {
 618                                 *store = cpu_to_be32(old);
 619                         }
 620                 }
 621                 break;
 622         }
 623
 624         case CSR_CHANNELS_AVAILABLE_HI:
 625         {
 626                 /* Lock algorithm for CHANNELS_AVAILABLE as recommended by 1394a-2000 */
 627                 quadlet_t affected_channels = arg ^ data;
 628
 629                 regptr = &host->csr.channels_available_hi;
 630
 631                 if ((arg & affected_channels) == (*regptr & affected_channels)) {
 632                         *regptr ^= affected_channels;
 633                         *store = cpu_to_be32(arg);
 634                 } else {
 635                         *store = cpu_to_be32(*regptr);
 636                 }
 637
 638                 break;
 639         }
 640
 641         case CSR_CHANNELS_AVAILABLE_LO:
 642         {
 643                 /* Lock algorithm for CHANNELS_AVAILABLE as recommended by 1394a-2000 */
 644                 quadlet_t affected_channels = arg ^ data;
 645
 646                 regptr = &host->csr.channels_available_lo;
 647
 648                 if ((arg & affected_channels) == (*regptr & affected_channels)) {
 649                         *regptr ^= affected_channels;
 650                         *store = cpu_to_be32(arg);
 651                 } else {
 652                         *store = cpu_to_be32(*regptr);
 653                 }
 654                 break;
 655         }
 656         }
 657
 658         spin_unlock_irqrestore(&host->csr.lock, flags);
 659
 660         return RCODE_COMPLETE;
 661
 662  unsupported_lockreq:
 663         switch (csraddr) {
 664         case CSR_STATE_CLEAR:
 665         case CSR_STATE_SET:
 666         case CSR_RESET_START:
 667         case CSR_NODE_IDS:
 668         case CSR_SPLIT_TIMEOUT_HI:
 669         case CSR_SPLIT_TIMEOUT_LO:
 670         case CSR_CYCLE_TIME:
 671         case CSR_BUS_TIME:
 672         case CSR_BROADCAST_CHANNEL:
 673                 return RCODE_TYPE_ERROR;
 674
 675         case CSR_BUSY_TIMEOUT:
 676                 /* not yet implemented - fall through */
 677         default:
 678                 return RCODE_ADDRESS_ERROR;
 679         }
 680 }
 681
 682 static int lock64_regs(struct hpsb_host *host, int nodeid, octlet_t * store,
 683                        u64 addr, octlet_t data, octlet_t arg, int extcode, u16 fl)
 684 {
 685         int csraddr = addr - CSR_REGISTER_BASE;
 686         unsigned long flags;
 687
 688         data = be64_to_cpu(data);
 689         arg = be64_to_cpu(arg);
 690
 691         if (csraddr & 0x3)
 692                 return RCODE_TYPE_ERROR;
 693
 694         if (csraddr != CSR_CHANNELS_AVAILABLE
 695             || extcode != EXTCODE_COMPARE_SWAP)
 696                 goto unsupported_lock64req;
 697
 698         /* Is somebody releasing the broadcast_channel on us? */
 699         if (csraddr == CSR_CHANNELS_AVAILABLE_HI && (data & 0x100000000ULL)) {
 700                 /* Note: this is may not be the right way to handle
 701                  * the problem, so we should look into the proper way
 702                  * eventually. */
 703                 HPSB_WARN("Node [" NODE_BUS_FMT "] wants to release "
 704                           "broadcast channel 31.  Ignoring.",
 705                           NODE_BUS_ARGS(host, nodeid));
 706
 707                 data &= ~0x100000000ULL;        /* keep broadcast channel allocated */
 708         }
 709
 710         if (host->driver->hw_csr_reg) {
 711                 quadlet_t data_hi, data_lo;
 712                 quadlet_t arg_hi, arg_lo;
 713                 quadlet_t old_hi, old_lo;
 714
 715                 data_hi = data >> 32;
 716                 data_lo = data & 0xFFFFFFFF;
 717                 arg_hi = arg >> 32;
 718                 arg_lo = arg & 0xFFFFFFFF;
 719
 720                 old_hi = host->driver->hw_csr_reg(host, (csraddr - CSR_BUS_MANAGER_ID) >> 2,
 721                                                   data_hi, arg_hi);
 722
 723                 old_lo = host->driver->hw_csr_reg(host, ((csraddr + 4) - CSR_BUS_MANAGER_ID) >> 2,
 724                                                   data_lo, arg_lo);
 725
 726                 *store = cpu_to_be64(((octlet_t)old_hi << 32) | old_lo);
 727         } else {
 728                 octlet_t old;
 729                 octlet_t affected_channels = arg ^ data;
 730
 731                 spin_lock_irqsave(&host->csr.lock, flags);
 732
 733                 old = ((octlet_t)host->csr.channels_available_hi << 32) | host->csr.channels_available_lo;
 734
 735                 if ((arg & affected_channels) == (old & affected_channels)) {
 736                         host->csr.channels_available_hi ^= (affected_channels >> 32);
 737                         host->csr.channels_available_lo ^= (affected_channels & 0xffffffff);
 738                         *store = cpu_to_be64(arg);
 739                 } else {
 740                         *store = cpu_to_be64(old);
 741                 }
 742
 743                 spin_unlock_irqrestore(&host->csr.lock, flags);
 744         }
 745
 746         /* Is somebody erroneously releasing the broadcast_channel on us? */
 747         if (host->csr.channels_available_hi & 0x1)
 748                 host->csr.channels_available_hi &= ~0x1;
 749
 750         return RCODE_COMPLETE;
 751
 752  unsupported_lock64req:
 753         switch (csraddr) {
 754         case CSR_STATE_CLEAR:
 755         case CSR_STATE_SET:
 756         case CSR_RESET_START:
 757         case CSR_NODE_IDS:
 758         case CSR_SPLIT_TIMEOUT_HI:
 759         case CSR_SPLIT_TIMEOUT_LO:
 760         case CSR_CYCLE_TIME:
 761         case CSR_BUS_TIME:
 762         case CSR_BUS_MANAGER_ID:
 763         case CSR_BROADCAST_CHANNEL:
 764         case CSR_BUSY_TIMEOUT:
 765         case CSR_BANDWIDTH_AVAILABLE:
 766                 return RCODE_TYPE_ERROR;
 767
 768         default:
 769                 return RCODE_ADDRESS_ERROR;
 770         }
 771 }
 772
 773 static int write_fcp(struct hpsb_host *host, int nodeid, int dest,
 774                      quadlet_t *data, u64 addr, size_t length, u16 flags)
 775 {
 776         int csraddr = addr - CSR_REGISTER_BASE;
 777
 778         if (length > 512)
 779                 return RCODE_TYPE_ERROR;
 780
 781         switch (csraddr) {
 782         case CSR_FCP_COMMAND:
 783                 highlevel_fcp_request(host, nodeid, 0, (u8 *)data, length);
 784                 break;
 785         case CSR_FCP_RESPONSE:
 786                 highlevel_fcp_request(host, nodeid, 1, (u8 *)data, length);
 787                 break;
 788         default:
 789                 return RCODE_TYPE_ERROR;
 790         }
 791
 792         return RCODE_COMPLETE;
 793 }
 794
 795 static int read_config_rom(struct hpsb_host *host, int nodeid, quadlet_t *buffer,
 796                            u64 addr, size_t length, u16 fl)
 797 {
 798         u32 offset = addr - CSR1212_REGISTER_SPACE_BASE;
 799
 800         if (csr1212_read(host->csr.rom, offset, buffer, length) == CSR1212_SUCCESS)
 801                 return RCODE_COMPLETE;
 802         else
 803                 return RCODE_ADDRESS_ERROR;
 804 }
 805
 806 static u64 allocate_addr_range(u64 size, u32 alignment, void *__host)
 807 {
 808         struct hpsb_host *host = (struct hpsb_host*)__host;
 809
 810         return hpsb_allocate_and_register_addrspace(&csr_highlevel,
 811                                                     host,
 812                                                     &config_rom_ops,
 813                                                     size, alignment,
 814                                                     CSR1212_UNITS_SPACE_BASE,
 815                                                     CSR1212_UNITS_SPACE_END);
 816 }
 817
 818 static void release_addr_range(u64 addr, void *__host)
 819 {
 820         struct hpsb_host *host = (struct hpsb_host*)__host;
 821         hpsb_unregister_addrspace(&csr_highlevel, host, addr);
 822 }
 823
 824
 825 int init_csr(void)
 826 {
 827         node_cap = csr1212_new_immediate(CSR1212_KV_ID_NODE_CAPABILITIES, 0x0083c0);
 828         if (!node_cap) {
 829                 HPSB_ERR("Failed to allocate memory for Node Capabilties ConfigROM entry!");
 830                 return -ENOMEM;
 831         }
 832
 833         hpsb_register_highlevel(&csr_highlevel);
 834
 835         return 0;
 836 }
 837
 838 void cleanup_csr(void)
 839 {
 840         if (node_cap)
 841                 csr1212_release_keyval(node_cap);
 842         hpsb_unregister_highlevel(&csr_highlevel);
 843 }