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 int usecs = (csr->split_timeout_hi & 7) * 1000000 +
 162                              (csr->split_timeout_lo >> 19) * 125;
 163
 164         csr->expire = usecs_to_jiffies(usecs > 100000 ? usecs : 100000);
 165         HPSB_VERBOSE("CSR: setting expire to %lu, HZ=%u", csr->expire, HZ);
 166 }
 167
 168
 169 static void add_host(struct hpsb_host *host)
 170 {
 171         struct csr1212_keyval *root;
 172         quadlet_t bus_info[CSR_BUS_INFO_SIZE];
 173
 174         hpsb_register_addrspace(&csr_highlevel, host, &reg_ops,
 175                                 CSR_REGISTER_BASE,
 176                                 CSR_REGISTER_BASE + CSR_CONFIG_ROM);
 177         hpsb_register_addrspace(&csr_highlevel, host, &config_rom_ops,
 178                                 CSR_REGISTER_BASE + CSR_CONFIG_ROM,
 179                                 CSR_REGISTER_BASE + CSR_CONFIG_ROM_END);
 180         if (fcp) {
 181                 hpsb_register_addrspace(&csr_highlevel, host, &fcp_ops,
 182                                         CSR_REGISTER_BASE + CSR_FCP_COMMAND,
 183                                         CSR_REGISTER_BASE + CSR_FCP_END);
 184         }
 185         hpsb_register_addrspace(&csr_highlevel, host, &map_ops,
 186                                 CSR_REGISTER_BASE + CSR_TOPOLOGY_MAP,
 187                                 CSR_REGISTER_BASE + CSR_TOPOLOGY_MAP_END);
 188         hpsb_register_addrspace(&csr_highlevel, host, &map_ops,
 189                                 CSR_REGISTER_BASE + CSR_SPEED_MAP,
 190                                 CSR_REGISTER_BASE + CSR_SPEED_MAP_END);
 191
 192         spin_lock_init(&host->csr.lock);
 193
 194         host->csr.state                 = 0;
 195         host->csr.node_ids              = 0;
 196         host->csr.split_timeout_hi      = 0;
 197         host->csr.split_timeout_lo      = 800 << 19;
 198         calculate_expire(&host->csr);
 199         host->csr.cycle_time            = 0;
 200         host->csr.bus_time              = 0;
 201         host->csr.bus_manager_id        = 0x3f;
 202         host->csr.bandwidth_available   = 4915;
 203         host->csr.channels_available_hi = 0xfffffffe;   /* pre-alloc ch 31 per 1394a-2000 */
 204         host->csr.channels_available_lo = ~0;
 205         host->csr.broadcast_channel = 0x80000000 | 31;
 206
 207         if (host->is_irm) {
 208                 if (host->driver->hw_csr_reg) {
 209                         host->driver->hw_csr_reg(host, 2, 0xfffffffe, ~0);
 210                 }
 211         }
 212
 213         if (host->csr.max_rec >= 9)
 214                 host->csr.max_rom = 2;
 215         else if (host->csr.max_rec >= 5)
 216                 host->csr.max_rom = 1;
 217         else
 218                 host->csr.max_rom = 0;
 219
 220         host->csr.generation = 2;
 221
 222         bus_info[1] = __constant_cpu_to_be32(0x31333934);
 223         bus_info[2] = cpu_to_be32((hpsb_disable_irm ? 0 : 1 << CSR_IRMC_SHIFT) |
 224                                   (1 << CSR_CMC_SHIFT) |
 225                                   (1 << CSR_ISC_SHIFT) |
 226                                   (0 << CSR_BMC_SHIFT) |
 227                                   (0 << CSR_PMC_SHIFT) |
 228                                   (host->csr.cyc_clk_acc << CSR_CYC_CLK_ACC_SHIFT) |
 229                                   (host->csr.max_rec << CSR_MAX_REC_SHIFT) |
 230                                   (host->csr.max_rom << CSR_MAX_ROM_SHIFT) |
 231                                   (host->csr.generation << CSR_GENERATION_SHIFT) |
 232                                   host->csr.lnk_spd);
 233
 234         bus_info[3] = cpu_to_be32(host->csr.guid_hi);
 235         bus_info[4] = cpu_to_be32(host->csr.guid_lo);
 236
 237         /* The hardware copy of the bus info block will be set later when a
 238          * bus reset is issued. */
 239
 240         csr1212_init_local_csr(host->csr.rom, bus_info, host->csr.max_rom);
 241
 242         root = host->csr.rom->root_kv;
 243
 244         if(csr1212_attach_keyval_to_directory(root, node_cap) != CSR1212_SUCCESS) {
 245                 HPSB_ERR("Failed to attach Node Capabilities to root directory");
 246         }
 247
 248         host->update_config_rom = 1;
 249 }
 250
 251 static void remove_host(struct hpsb_host *host)
 252 {
 253         quadlet_t bus_info[CSR_BUS_INFO_SIZE];
 254
 255         bus_info[1] = __constant_cpu_to_be32(0x31333934);
 256         bus_info[2] = cpu_to_be32((0 << CSR_IRMC_SHIFT) |
 257                                   (0 << CSR_CMC_SHIFT) |
 258                                   (0 << CSR_ISC_SHIFT) |
 259                                   (0 << CSR_BMC_SHIFT) |
 260                                   (0 << CSR_PMC_SHIFT) |
 261                                   (host->csr.cyc_clk_acc << CSR_CYC_CLK_ACC_SHIFT) |
 262                                   (host->csr.max_rec << CSR_MAX_REC_SHIFT) |
 263                                   (0 << CSR_MAX_ROM_SHIFT) |
 264                                   (0 << CSR_GENERATION_SHIFT) |
 265                                   host->csr.lnk_spd);
 266
 267         bus_info[3] = cpu_to_be32(host->csr.guid_hi);
 268         bus_info[4] = cpu_to_be32(host->csr.guid_lo);
 269
 270         csr1212_detach_keyval_from_directory(host->csr.rom->root_kv, node_cap);
 271
 272         csr1212_init_local_csr(host->csr.rom, bus_info, 0);
 273         host->update_config_rom = 1;
 274 }
 275
 276
 277 int hpsb_update_config_rom(struct hpsb_host *host, const quadlet_t *new_rom,
 278         size_t buffersize, unsigned char rom_version)
 279 {
 280         unsigned long flags;
 281         int ret;
 282
 283         HPSB_NOTICE("hpsb_update_config_rom() is deprecated");
 284
 285         spin_lock_irqsave(&host->csr.lock, flags);
 286         if (rom_version != host->csr.generation)
 287                 ret = -1;
 288         else if (buffersize > host->csr.rom->cache_head->size)
 289                 ret = -2;
 290         else {
 291                 /* Just overwrite the generated ConfigROM image with new data,
 292                  * it can be regenerated later. */
 293                 memcpy(host->csr.rom->cache_head->data, new_rom, buffersize);
 294                 host->csr.rom->cache_head->len = buffersize;
 295
 296                 if (host->driver->set_hw_config_rom)
 297                         host->driver->set_hw_config_rom(host, host->csr.rom->bus_info_data);
 298                 /* Increment the generation number to keep some sort of sync
 299                  * with the newer ConfigROM manipulation method. */
 300                 host->csr.generation++;
 301                 if (host->csr.generation > 0xf || host->csr.generation < 2)
 302                         host->csr.generation = 2;
 303                 ret=0;
 304         }
 305         spin_unlock_irqrestore(&host->csr.lock, flags);
 306         return ret;
 307 }
 308
 309
 310 /* Read topology / speed maps and configuration ROM */
 311 static int read_maps(struct hpsb_host *host, int nodeid, quadlet_t *buffer,
 312                      u64 addr, size_t length, u16 fl)
 313 {
 314         unsigned long flags;
 315         int csraddr = addr - CSR_REGISTER_BASE;
 316         const char *src;
 317
 318         spin_lock_irqsave(&host->csr.lock, flags);
 319
 320         if (csraddr < CSR_SPEED_MAP) {
 321                 src = ((char *)host->csr.topology_map) + csraddr
 322                         - CSR_TOPOLOGY_MAP;
 323         } else {
 324                 src = ((char *)host->csr.speed_map) + csraddr - CSR_SPEED_MAP;
 325         }
 326
 327         memcpy(buffer, src, length);
 328         spin_unlock_irqrestore(&host->csr.lock, flags);
 329         return RCODE_COMPLETE;
 330 }
 331
 332
 333 #define out if (--length == 0) break
 334
 335 static int read_regs(struct hpsb_host *host, int nodeid, quadlet_t *buf,
 336                      u64 addr, size_t length, u16 flags)
 337 {
 338         int csraddr = addr - CSR_REGISTER_BASE;
 339         int oldcycle;
 340         quadlet_t ret;
 341
 342         if ((csraddr | length) & 0x3)
 343                 return RCODE_TYPE_ERROR;
 344
 345         length /= 4;
 346
 347         switch (csraddr) {
 348         case CSR_STATE_CLEAR:
 349                 *(buf++) = cpu_to_be32(host->csr.state);
 350                 out;
 351         case CSR_STATE_SET:
 352                 *(buf++) = cpu_to_be32(host->csr.state);
 353                 out;
 354         case CSR_NODE_IDS:
 355                 *(buf++) = cpu_to_be32(host->csr.node_ids);
 356                 out;
 357
 358         case CSR_RESET_START:
 359                 return RCODE_TYPE_ERROR;
 360
 361                 /* address gap - handled by default below */
 362
 363         case CSR_SPLIT_TIMEOUT_HI:
 364                 *(buf++) = cpu_to_be32(host->csr.split_timeout_hi);
 365                 out;
 366         case CSR_SPLIT_TIMEOUT_LO:
 367                 *(buf++) = cpu_to_be32(host->csr.split_timeout_lo);
 368                 out;
 369
 370                 /* address gap */
 371                 return RCODE_ADDRESS_ERROR;
 372
 373         case CSR_CYCLE_TIME:
 374                 oldcycle = host->csr.cycle_time;
 375                 host->csr.cycle_time =
 376                         host->driver->devctl(host, GET_CYCLE_COUNTER, 0);
 377
 378                 if (oldcycle > host->csr.cycle_time) {
 379                         /* cycle time wrapped around */
 380                         host->csr.bus_time += 1 << 7;
 381                 }
 382                 *(buf++) = cpu_to_be32(host->csr.cycle_time);
 383                 out;
 384         case CSR_BUS_TIME:
 385                 oldcycle = host->csr.cycle_time;
 386                 host->csr.cycle_time =
 387                         host->driver->devctl(host, GET_CYCLE_COUNTER, 0);
 388
 389                 if (oldcycle > host->csr.cycle_time) {
 390                         /* cycle time wrapped around */
 391                         host->csr.bus_time += (1 << 7);
 392                 }
 393                 *(buf++) = cpu_to_be32(host->csr.bus_time
 394                                        | (host->csr.cycle_time >> 25));
 395                 out;
 396
 397                 /* address gap */
 398                 return RCODE_ADDRESS_ERROR;
 399
 400         case CSR_BUSY_TIMEOUT:
 401                 /* not yet implemented */
 402                 return RCODE_ADDRESS_ERROR;
 403
 404         case CSR_BUS_MANAGER_ID:
 405                 if (host->driver->hw_csr_reg)
 406                         ret = host->driver->hw_csr_reg(host, 0, 0, 0);
 407                 else
 408                         ret = host->csr.bus_manager_id;
 409
 410                 *(buf++) = cpu_to_be32(ret);
 411                 out;
 412         case CSR_BANDWIDTH_AVAILABLE:
 413                 if (host->driver->hw_csr_reg)
 414                         ret = host->driver->hw_csr_reg(host, 1, 0, 0);
 415                 else
 416                         ret = host->csr.bandwidth_available;
 417
 418                 *(buf++) = cpu_to_be32(ret);
 419                 out;
 420         case CSR_CHANNELS_AVAILABLE_HI:
 421                 if (host->driver->hw_csr_reg)
 422                         ret = host->driver->hw_csr_reg(host, 2, 0, 0);
 423                 else
 424                         ret = host->csr.channels_available_hi;
 425
 426                 *(buf++) = cpu_to_be32(ret);
 427                 out;
 428         case CSR_CHANNELS_AVAILABLE_LO:
 429                 if (host->driver->hw_csr_reg)
 430                         ret = host->driver->hw_csr_reg(host, 3, 0, 0);
 431                 else
 432                         ret = host->csr.channels_available_lo;
 433
 434                 *(buf++) = cpu_to_be32(ret);
 435                 out;
 436
 437         case CSR_BROADCAST_CHANNEL:
 438                 *(buf++) = cpu_to_be32(host->csr.broadcast_channel);
 439                 out;
 440
 441                 /* address gap to end - fall through to default */
 442         default:
 443                 return RCODE_ADDRESS_ERROR;
 444         }
 445
 446         return RCODE_COMPLETE;
 447 }
 448
 449 static int write_regs(struct hpsb_host *host, int nodeid, int destid,
 450                       quadlet_t *data, u64 addr, size_t length, u16 flags)
 451 {
 452         int csraddr = addr - CSR_REGISTER_BASE;
 453
 454         if ((csraddr | length) & 0x3)
 455                 return RCODE_TYPE_ERROR;
 456
 457         length /= 4;
 458
 459         switch (csraddr) {
 460         case CSR_STATE_CLEAR:
 461                 /* FIXME FIXME FIXME */
 462                 printk("doh, someone wants to mess with state clear\n");
 463                 out;
 464         case CSR_STATE_SET:
 465                 printk("doh, someone wants to mess with state set\n");
 466                 out;
 467
 468         case CSR_NODE_IDS:
 469                 host->csr.node_ids &= NODE_MASK << 16;
 470                 host->csr.node_ids |= be32_to_cpu(*(data++)) & (BUS_MASK << 16);
 471                 host->node_id = host->csr.node_ids >> 16;
 472                 host->driver->devctl(host, SET_BUS_ID, host->node_id >> 6);
 473                 out;
 474
 475         case CSR_RESET_START:
 476                 /* FIXME - perform command reset */
 477                 out;
 478
 479                 /* address gap */
 480                 return RCODE_ADDRESS_ERROR;
 481
 482         case CSR_SPLIT_TIMEOUT_HI:
 483                 host->csr.split_timeout_hi =
 484                         be32_to_cpu(*(data++)) & 0x00000007;
 485                 calculate_expire(&host->csr);
 486                 out;
 487         case CSR_SPLIT_TIMEOUT_LO:
 488                 host->csr.split_timeout_lo =
 489                         be32_to_cpu(*(data++)) & 0xfff80000;
 490                 calculate_expire(&host->csr);
 491                 out;
 492
 493                 /* address gap */
 494                 return RCODE_ADDRESS_ERROR;
 495
 496         case CSR_CYCLE_TIME:
 497                 /* should only be set by cycle start packet, automatically */
 498                 host->csr.cycle_time = be32_to_cpu(*data);
 499                 host->driver->devctl(host, SET_CYCLE_COUNTER,
 500                                        be32_to_cpu(*(data++)));
 501                 out;
 502         case CSR_BUS_TIME:
 503                 host->csr.bus_time = be32_to_cpu(*(data++)) & 0xffffff80;
 504                 out;
 505
 506                 /* address gap */
 507                 return RCODE_ADDRESS_ERROR;
 508
 509         case CSR_BUSY_TIMEOUT:
 510                 /* not yet implemented */
 511                 return RCODE_ADDRESS_ERROR;
 512
 513         case CSR_BUS_MANAGER_ID:
 514         case CSR_BANDWIDTH_AVAILABLE:
 515         case CSR_CHANNELS_AVAILABLE_HI:
 516         case CSR_CHANNELS_AVAILABLE_LO:
 517                 /* these are not writable, only lockable */
 518                 return RCODE_TYPE_ERROR;
 519
 520         case CSR_BROADCAST_CHANNEL:
 521                 /* only the valid bit can be written */
 522                 host->csr.broadcast_channel = (host->csr.broadcast_channel & ~0x40000000)
 523                         | (be32_to_cpu(*data) & 0x40000000);
 524                 out;
 525
 526                 /* address gap to end - fall through */
 527         default:
 528                 return RCODE_ADDRESS_ERROR;
 529         }
 530
 531         return RCODE_COMPLETE;
 532 }
 533
 534 #undef out
 535
 536
 537 static int lock_regs(struct hpsb_host *host, int nodeid, quadlet_t *store,
 538                      u64 addr, quadlet_t data, quadlet_t arg, int extcode, u16 fl)
 539 {
 540         int csraddr = addr - CSR_REGISTER_BASE;
 541         unsigned long flags;
 542         quadlet_t *regptr = NULL;
 543
 544         if (csraddr & 0x3)
 545                 return RCODE_TYPE_ERROR;
 546
 547         if (csraddr < CSR_BUS_MANAGER_ID || csraddr > CSR_CHANNELS_AVAILABLE_LO
 548             || extcode != EXTCODE_COMPARE_SWAP)
 549                 goto unsupported_lockreq;
 550
 551         data = be32_to_cpu(data);
 552         arg = be32_to_cpu(arg);
 553
 554         /* Is somebody releasing the broadcast_channel on us? */
 555         if (csraddr == CSR_CHANNELS_AVAILABLE_HI && (data & 0x1)) {
 556                 /* Note: this is may not be the right way to handle
 557                  * the problem, so we should look into the proper way
 558                  * eventually. */
 559                 HPSB_WARN("Node [" NODE_BUS_FMT "] wants to release "
 560                           "broadcast channel 31.  Ignoring.",
 561                           NODE_BUS_ARGS(host, nodeid));
 562
 563                 data &= ~0x1;   /* keep broadcast channel allocated */
 564         }
 565
 566         if (host->driver->hw_csr_reg) {
 567                 quadlet_t old;
 568
 569                 old = host->driver->
 570                         hw_csr_reg(host, (csraddr - CSR_BUS_MANAGER_ID) >> 2,
 571                                    data, arg);
 572
 573                 *store = cpu_to_be32(old);
 574                 return RCODE_COMPLETE;
 575         }
 576
 577         spin_lock_irqsave(&host->csr.lock, flags);
 578
 579         switch (csraddr) {
 580         case CSR_BUS_MANAGER_ID:
 581                 regptr = &host->csr.bus_manager_id;
 582                 *store = cpu_to_be32(*regptr);
 583                 if (*regptr == arg)
 584                         *regptr = data;
 585                 break;
 586
 587         case CSR_BANDWIDTH_AVAILABLE:
 588         {
 589                 quadlet_t bandwidth;
 590                 quadlet_t old;
 591                 quadlet_t new;
 592
 593                 regptr = &host->csr.bandwidth_available;
 594                 old = *regptr;
 595
 596                 /* bandwidth available algorithm adapted from IEEE 1394a-2000 spec */
 597                 if (arg > 0x1fff) {
 598                         *store = cpu_to_be32(old);      /* change nothing */
 599                         break;
 600                 }
 601                 data &= 0x1fff;
 602                 if (arg >= data) {
 603                         /* allocate bandwidth */
 604                         bandwidth = arg - data;
 605                         if (old >= bandwidth) {
 606                                 new = old - bandwidth;
 607                                 *store = cpu_to_be32(arg);
 608                                 *regptr = new;
 609                         } else {
 610                                 *store = cpu_to_be32(old);
 611                         }
 612                 } else {
 613                         /* deallocate bandwidth */
 614                         bandwidth = data - arg;
 615                         if (old + bandwidth < 0x2000) {
 616                                 new = old + bandwidth;
 617                                 *store = cpu_to_be32(arg);
 618                                 *regptr = new;
 619                         } else {
 620                                 *store = cpu_to_be32(old);
 621                         }
 622                 }
 623                 break;
 624         }
 625
 626         case CSR_CHANNELS_AVAILABLE_HI:
 627         {
 628                 /* Lock algorithm for CHANNELS_AVAILABLE as recommended by 1394a-2000 */
 629                 quadlet_t affected_channels = arg ^ data;
 630
 631                 regptr = &host->csr.channels_available_hi;
 632
 633                 if ((arg & affected_channels) == (*regptr & affected_channels)) {
 634                         *regptr ^= affected_channels;
 635                         *store = cpu_to_be32(arg);
 636                 } else {
 637                         *store = cpu_to_be32(*regptr);
 638                 }
 639
 640                 break;
 641         }
 642
 643         case CSR_CHANNELS_AVAILABLE_LO:
 644         {
 645                 /* Lock algorithm for CHANNELS_AVAILABLE as recommended by 1394a-2000 */
 646                 quadlet_t affected_channels = arg ^ data;
 647
 648                 regptr = &host->csr.channels_available_lo;
 649
 650                 if ((arg & affected_channels) == (*regptr & affected_channels)) {
 651                         *regptr ^= affected_channels;
 652                         *store = cpu_to_be32(arg);
 653                 } else {
 654                         *store = cpu_to_be32(*regptr);
 655                 }
 656                 break;
 657         }
 658         }
 659
 660         spin_unlock_irqrestore(&host->csr.lock, flags);
 661
 662         return RCODE_COMPLETE;
 663
 664  unsupported_lockreq:
 665         switch (csraddr) {
 666         case CSR_STATE_CLEAR:
 667         case CSR_STATE_SET:
 668         case CSR_RESET_START:
 669         case CSR_NODE_IDS:
 670         case CSR_SPLIT_TIMEOUT_HI:
 671         case CSR_SPLIT_TIMEOUT_LO:
 672         case CSR_CYCLE_TIME:
 673         case CSR_BUS_TIME:
 674         case CSR_BROADCAST_CHANNEL:
 675                 return RCODE_TYPE_ERROR;
 676
 677         case CSR_BUSY_TIMEOUT:
 678                 /* not yet implemented - fall through */
 679         default:
 680                 return RCODE_ADDRESS_ERROR;
 681         }
 682 }
 683
 684 static int lock64_regs(struct hpsb_host *host, int nodeid, octlet_t * store,
 685                        u64 addr, octlet_t data, octlet_t arg, int extcode, u16 fl)
 686 {
 687         int csraddr = addr - CSR_REGISTER_BASE;
 688         unsigned long flags;
 689
 690         data = be64_to_cpu(data);
 691         arg = be64_to_cpu(arg);
 692
 693         if (csraddr & 0x3)
 694                 return RCODE_TYPE_ERROR;
 695
 696         if (csraddr != CSR_CHANNELS_AVAILABLE
 697             || extcode != EXTCODE_COMPARE_SWAP)
 698                 goto unsupported_lock64req;
 699
 700         /* Is somebody releasing the broadcast_channel on us? */
 701         if (csraddr == CSR_CHANNELS_AVAILABLE_HI && (data & 0x100000000ULL)) {
 702                 /* Note: this is may not be the right way to handle
 703                  * the problem, so we should look into the proper way
 704                  * eventually. */
 705                 HPSB_WARN("Node [" NODE_BUS_FMT "] wants to release "
 706                           "broadcast channel 31.  Ignoring.",
 707                           NODE_BUS_ARGS(host, nodeid));
 708
 709                 data &= ~0x100000000ULL;        /* keep broadcast channel allocated */
 710         }
 711
 712         if (host->driver->hw_csr_reg) {
 713                 quadlet_t data_hi, data_lo;
 714                 quadlet_t arg_hi, arg_lo;
 715                 quadlet_t old_hi, old_lo;
 716
 717                 data_hi = data >> 32;
 718                 data_lo = data & 0xFFFFFFFF;
 719                 arg_hi = arg >> 32;
 720                 arg_lo = arg & 0xFFFFFFFF;
 721
 722                 old_hi = host->driver->hw_csr_reg(host, (csraddr - CSR_BUS_MANAGER_ID) >> 2,
 723                                                   data_hi, arg_hi);
 724
 725                 old_lo = host->driver->hw_csr_reg(host, ((csraddr + 4) - CSR_BUS_MANAGER_ID) >> 2,
 726                                                   data_lo, arg_lo);
 727
 728                 *store = cpu_to_be64(((octlet_t)old_hi << 32) | old_lo);
 729         } else {
 730                 octlet_t old;
 731                 octlet_t affected_channels = arg ^ data;
 732
 733                 spin_lock_irqsave(&host->csr.lock, flags);
 734
 735                 old = ((octlet_t)host->csr.channels_available_hi << 32) | host->csr.channels_available_lo;
 736
 737                 if ((arg & affected_channels) == (old & affected_channels)) {
 738                         host->csr.channels_available_hi ^= (affected_channels >> 32);
 739                         host->csr.channels_available_lo ^= (affected_channels & 0xffffffff);
 740                         *store = cpu_to_be64(arg);
 741                 } else {
 742                         *store = cpu_to_be64(old);
 743                 }
 744
 745                 spin_unlock_irqrestore(&host->csr.lock, flags);
 746         }
 747
 748         /* Is somebody erroneously releasing the broadcast_channel on us? */
 749         if (host->csr.channels_available_hi & 0x1)
 750                 host->csr.channels_available_hi &= ~0x1;
 751
 752         return RCODE_COMPLETE;
 753
 754  unsupported_lock64req:
 755         switch (csraddr) {
 756         case CSR_STATE_CLEAR:
 757         case CSR_STATE_SET:
 758         case CSR_RESET_START:
 759         case CSR_NODE_IDS:
 760         case CSR_SPLIT_TIMEOUT_HI:
 761         case CSR_SPLIT_TIMEOUT_LO:
 762         case CSR_CYCLE_TIME:
 763         case CSR_BUS_TIME:
 764         case CSR_BUS_MANAGER_ID:
 765         case CSR_BROADCAST_CHANNEL:
 766         case CSR_BUSY_TIMEOUT:
 767         case CSR_BANDWIDTH_AVAILABLE:
 768                 return RCODE_TYPE_ERROR;
 769
 770         default:
 771                 return RCODE_ADDRESS_ERROR;
 772         }
 773 }
 774
 775 static int write_fcp(struct hpsb_host *host, int nodeid, int dest,
 776                      quadlet_t *data, u64 addr, size_t length, u16 flags)
 777 {
 778         int csraddr = addr - CSR_REGISTER_BASE;
 779
 780         if (length > 512)
 781                 return RCODE_TYPE_ERROR;
 782
 783         switch (csraddr) {
 784         case CSR_FCP_COMMAND:
 785                 highlevel_fcp_request(host, nodeid, 0, (u8 *)data, length);
 786                 break;
 787         case CSR_FCP_RESPONSE:
 788                 highlevel_fcp_request(host, nodeid, 1, (u8 *)data, length);
 789                 break;
 790         default:
 791                 return RCODE_TYPE_ERROR;
 792         }
 793
 794         return RCODE_COMPLETE;
 795 }
 796
 797 static int read_config_rom(struct hpsb_host *host, int nodeid, quadlet_t *buffer,
 798                            u64 addr, size_t length, u16 fl)
 799 {
 800         u32 offset = addr - CSR1212_REGISTER_SPACE_BASE;
 801
 802         if (csr1212_read(host->csr.rom, offset, buffer, length) == CSR1212_SUCCESS)
 803                 return RCODE_COMPLETE;
 804         else
 805                 return RCODE_ADDRESS_ERROR;
 806 }
 807
 808 static u64 allocate_addr_range(u64 size, u32 alignment, void *__host)
 809 {
 810         struct hpsb_host *host = (struct hpsb_host*)__host;
 811
 812         return hpsb_allocate_and_register_addrspace(&csr_highlevel,
 813                                                     host,
 814                                                     &config_rom_ops,
 815                                                     size, alignment,
 816                                                     CSR1212_UNITS_SPACE_BASE,
 817                                                     CSR1212_UNITS_SPACE_END);
 818 }
 819
 820 static void release_addr_range(u64 addr, void *__host)
 821 {
 822         struct hpsb_host *host = (struct hpsb_host*)__host;
 823         hpsb_unregister_addrspace(&csr_highlevel, host, addr);
 824 }
 825
 826
 827 int init_csr(void)
 828 {
 829         node_cap = csr1212_new_immediate(CSR1212_KV_ID_NODE_CAPABILITIES, 0x0083c0);
 830         if (!node_cap) {
 831                 HPSB_ERR("Failed to allocate memory for Node Capabilties ConfigROM entry!");
 832                 return -ENOMEM;
 833         }
 834
 835         hpsb_register_highlevel(&csr_highlevel);
 836
 837         return 0;
 838 }
 839
 840 void cleanup_csr(void)
 841 {
 842         if (node_cap)
 843                 csr1212_release_keyval(node_cap);
 844         hpsb_unregister_highlevel(&csr_highlevel);
 845 }