linux/arch/powerpc/platforms/powermac/pfunc_core.c
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   1/*
   2 *
   3 * FIXME: Properly make this race free with refcounting etc...
   4 *
   5 * FIXME: LOCKING !!!
   6 */
   7
   8#include <linux/init.h>
   9#include <linux/delay.h>
  10#include <linux/kernel.h>
  11#include <linux/spinlock.h>
  12#include <linux/slab.h>
  13#include <linux/module.h>
  14#include <linux/mutex.h>
  15
  16#include <asm/prom.h>
  17#include <asm/pmac_pfunc.h>
  18
  19/* Debug */
  20#define LOG_PARSE(fmt...)
  21#define LOG_ERROR(fmt...)       printk(fmt)
  22#define LOG_BLOB(t,b,c)
  23
  24#undef DEBUG
  25#ifdef DEBUG
  26#define DBG(fmt...)             printk(fmt)
  27#else
  28#define DBG(fmt...)
  29#endif
  30
  31/* Command numbers */
  32#define PMF_CMD_LIST                    0
  33#define PMF_CMD_WRITE_GPIO              1
  34#define PMF_CMD_READ_GPIO               2
  35#define PMF_CMD_WRITE_REG32             3
  36#define PMF_CMD_READ_REG32              4
  37#define PMF_CMD_WRITE_REG16             5
  38#define PMF_CMD_READ_REG16              6
  39#define PMF_CMD_WRITE_REG8              7
  40#define PMF_CMD_READ_REG8               8
  41#define PMF_CMD_DELAY                   9
  42#define PMF_CMD_WAIT_REG32              10
  43#define PMF_CMD_WAIT_REG16              11
  44#define PMF_CMD_WAIT_REG8               12
  45#define PMF_CMD_READ_I2C                13
  46#define PMF_CMD_WRITE_I2C               14
  47#define PMF_CMD_RMW_I2C                 15
  48#define PMF_CMD_GEN_I2C                 16
  49#define PMF_CMD_SHIFT_BYTES_RIGHT       17
  50#define PMF_CMD_SHIFT_BYTES_LEFT        18
  51#define PMF_CMD_READ_CFG                19
  52#define PMF_CMD_WRITE_CFG               20
  53#define PMF_CMD_RMW_CFG                 21
  54#define PMF_CMD_READ_I2C_SUBADDR        22
  55#define PMF_CMD_WRITE_I2C_SUBADDR       23
  56#define PMF_CMD_SET_I2C_MODE            24
  57#define PMF_CMD_RMW_I2C_SUBADDR         25
  58#define PMF_CMD_READ_REG32_MASK_SHR_XOR 26
  59#define PMF_CMD_READ_REG16_MASK_SHR_XOR 27
  60#define PMF_CMD_READ_REG8_MASK_SHR_XOR  28
  61#define PMF_CMD_WRITE_REG32_SHL_MASK    29
  62#define PMF_CMD_WRITE_REG16_SHL_MASK    30
  63#define PMF_CMD_WRITE_REG8_SHL_MASK     31
  64#define PMF_CMD_MASK_AND_COMPARE        32
  65#define PMF_CMD_COUNT                   33
  66
  67/* This structure holds the state of the parser while walking through
  68 * a function definition
  69 */
  70struct pmf_cmd {
  71        const void              *cmdptr;
  72        const void              *cmdend;
  73        struct pmf_function     *func;
  74        void                    *instdata;
  75        struct pmf_args         *args;
  76        int                     error;
  77};
  78
  79#if 0
  80/* Debug output */
  81static void print_blob(const char *title, const void *blob, int bytes)
  82{
  83        printk("%s", title);
  84        while(bytes--) {
  85                printk("%02x ", *((u8 *)blob));
  86                blob += 1;
  87        }
  88        printk("\n");
  89}
  90#endif
  91
  92/*
  93 * Parser helpers
  94 */
  95
  96static u32 pmf_next32(struct pmf_cmd *cmd)
  97{
  98        u32 value;
  99        if ((cmd->cmdend - cmd->cmdptr) < 4) {
 100                cmd->error = 1;
 101                return 0;
 102        }
 103        value = *((u32 *)cmd->cmdptr);
 104        cmd->cmdptr += 4;
 105        return value;
 106}
 107
 108static const void* pmf_next_blob(struct pmf_cmd *cmd, int count)
 109{
 110        const void *value;
 111        if ((cmd->cmdend - cmd->cmdptr) < count) {
 112                cmd->error = 1;
 113                return NULL;
 114        }
 115        value = cmd->cmdptr;
 116        cmd->cmdptr += count;
 117        return value;
 118}
 119
 120/*
 121 * Individual command parsers
 122 */
 123
 124#define PMF_PARSE_CALL(name, cmd, handlers, p...) \
 125        do { \
 126                if (cmd->error) \
 127                        return -ENXIO; \
 128                if (handlers == NULL) \
 129                        return 0; \
 130                if (handlers->name)                                   \
 131                        return handlers->name(cmd->func, cmd->instdata, \
 132                                              cmd->args, p);          \
 133                return -1; \
 134        } while(0) \
 135
 136
 137static int pmf_parser_write_gpio(struct pmf_cmd *cmd, struct pmf_handlers *h)
 138{
 139        u8 value = (u8)pmf_next32(cmd);
 140        u8 mask = (u8)pmf_next32(cmd);
 141
 142        LOG_PARSE("pmf: write_gpio(value: %02x, mask: %02x)\n", value, mask);
 143
 144        PMF_PARSE_CALL(write_gpio, cmd, h, value, mask);
 145}
 146
 147static int pmf_parser_read_gpio(struct pmf_cmd *cmd, struct pmf_handlers *h)
 148{
 149        u8 mask = (u8)pmf_next32(cmd);
 150        int rshift = (int)pmf_next32(cmd);
 151        u8 xor = (u8)pmf_next32(cmd);
 152
 153        LOG_PARSE("pmf: read_gpio(mask: %02x, rshift: %d, xor: %02x)\n",
 154                  mask, rshift, xor);
 155
 156        PMF_PARSE_CALL(read_gpio, cmd, h, mask, rshift, xor);
 157}
 158
 159static int pmf_parser_write_reg32(struct pmf_cmd *cmd, struct pmf_handlers *h)
 160{
 161        u32 offset = pmf_next32(cmd);
 162        u32 value = pmf_next32(cmd);
 163        u32 mask = pmf_next32(cmd);
 164
 165        LOG_PARSE("pmf: write_reg32(offset: %08x, value: %08x, mask: %08x)\n",
 166                  offset, value, mask);
 167
 168        PMF_PARSE_CALL(write_reg32, cmd, h, offset, value, mask);
 169}
 170
 171static int pmf_parser_read_reg32(struct pmf_cmd *cmd, struct pmf_handlers *h)
 172{
 173        u32 offset = pmf_next32(cmd);
 174
 175        LOG_PARSE("pmf: read_reg32(offset: %08x)\n", offset);
 176
 177        PMF_PARSE_CALL(read_reg32, cmd, h, offset);
 178}
 179
 180
 181static int pmf_parser_write_reg16(struct pmf_cmd *cmd, struct pmf_handlers *h)
 182{
 183        u32 offset = pmf_next32(cmd);
 184        u16 value = (u16)pmf_next32(cmd);
 185        u16 mask = (u16)pmf_next32(cmd);
 186
 187        LOG_PARSE("pmf: write_reg16(offset: %08x, value: %04x, mask: %04x)\n",
 188                  offset, value, mask);
 189
 190        PMF_PARSE_CALL(write_reg16, cmd, h, offset, value, mask);
 191}
 192
 193static int pmf_parser_read_reg16(struct pmf_cmd *cmd, struct pmf_handlers *h)
 194{
 195        u32 offset = pmf_next32(cmd);
 196
 197        LOG_PARSE("pmf: read_reg16(offset: %08x)\n", offset);
 198
 199        PMF_PARSE_CALL(read_reg16, cmd, h, offset);
 200}
 201
 202
 203static int pmf_parser_write_reg8(struct pmf_cmd *cmd, struct pmf_handlers *h)
 204{
 205        u32 offset = pmf_next32(cmd);
 206        u8 value = (u16)pmf_next32(cmd);
 207        u8 mask = (u16)pmf_next32(cmd);
 208
 209        LOG_PARSE("pmf: write_reg8(offset: %08x, value: %02x, mask: %02x)\n",
 210                  offset, value, mask);
 211
 212        PMF_PARSE_CALL(write_reg8, cmd, h, offset, value, mask);
 213}
 214
 215static int pmf_parser_read_reg8(struct pmf_cmd *cmd, struct pmf_handlers *h)
 216{
 217        u32 offset = pmf_next32(cmd);
 218
 219        LOG_PARSE("pmf: read_reg8(offset: %08x)\n", offset);
 220
 221        PMF_PARSE_CALL(read_reg8, cmd, h, offset);
 222}
 223
 224static int pmf_parser_delay(struct pmf_cmd *cmd, struct pmf_handlers *h)
 225{
 226        u32 duration = pmf_next32(cmd);
 227
 228        LOG_PARSE("pmf: delay(duration: %d us)\n", duration);
 229
 230        PMF_PARSE_CALL(delay, cmd, h, duration);
 231}
 232
 233static int pmf_parser_wait_reg32(struct pmf_cmd *cmd, struct pmf_handlers *h)
 234{
 235        u32 offset = pmf_next32(cmd);
 236        u32 value = pmf_next32(cmd);
 237        u32 mask = pmf_next32(cmd);
 238
 239        LOG_PARSE("pmf: wait_reg32(offset: %08x, comp_value: %08x,mask: %08x)\n",
 240                  offset, value, mask);
 241
 242        PMF_PARSE_CALL(wait_reg32, cmd, h, offset, value, mask);
 243}
 244
 245static int pmf_parser_wait_reg16(struct pmf_cmd *cmd, struct pmf_handlers *h)
 246{
 247        u32 offset = pmf_next32(cmd);
 248        u16 value = (u16)pmf_next32(cmd);
 249        u16 mask = (u16)pmf_next32(cmd);
 250
 251        LOG_PARSE("pmf: wait_reg16(offset: %08x, comp_value: %04x,mask: %04x)\n",
 252                  offset, value, mask);
 253
 254        PMF_PARSE_CALL(wait_reg16, cmd, h, offset, value, mask);
 255}
 256
 257static int pmf_parser_wait_reg8(struct pmf_cmd *cmd, struct pmf_handlers *h)
 258{
 259        u32 offset = pmf_next32(cmd);
 260        u8 value = (u8)pmf_next32(cmd);
 261        u8 mask = (u8)pmf_next32(cmd);
 262
 263        LOG_PARSE("pmf: wait_reg8(offset: %08x, comp_value: %02x,mask: %02x)\n",
 264                  offset, value, mask);
 265
 266        PMF_PARSE_CALL(wait_reg8, cmd, h, offset, value, mask);
 267}
 268
 269static int pmf_parser_read_i2c(struct pmf_cmd *cmd, struct pmf_handlers *h)
 270{
 271        u32 bytes = pmf_next32(cmd);
 272
 273        LOG_PARSE("pmf: read_i2c(bytes: %ud)\n", bytes);
 274
 275        PMF_PARSE_CALL(read_i2c, cmd, h, bytes);
 276}
 277
 278static int pmf_parser_write_i2c(struct pmf_cmd *cmd, struct pmf_handlers *h)
 279{
 280        u32 bytes = pmf_next32(cmd);
 281        const void *blob = pmf_next_blob(cmd, bytes);
 282
 283        LOG_PARSE("pmf: write_i2c(bytes: %ud) ...\n", bytes);
 284        LOG_BLOB("pmf:   data: \n", blob, bytes);
 285
 286        PMF_PARSE_CALL(write_i2c, cmd, h, bytes, blob);
 287}
 288
 289
 290static int pmf_parser_rmw_i2c(struct pmf_cmd *cmd, struct pmf_handlers *h)
 291{
 292        u32 maskbytes = pmf_next32(cmd);
 293        u32 valuesbytes = pmf_next32(cmd);
 294        u32 totalbytes = pmf_next32(cmd);
 295        const void *maskblob = pmf_next_blob(cmd, maskbytes);
 296        const void *valuesblob = pmf_next_blob(cmd, valuesbytes);
 297
 298        LOG_PARSE("pmf: rmw_i2c(maskbytes: %ud, valuebytes: %ud, "
 299                  "totalbytes: %d) ...\n",
 300                  maskbytes, valuesbytes, totalbytes);
 301        LOG_BLOB("pmf:   mask data: \n", maskblob, maskbytes);
 302        LOG_BLOB("pmf:   values data: \n", valuesblob, valuesbytes);
 303
 304        PMF_PARSE_CALL(rmw_i2c, cmd, h, maskbytes, valuesbytes, totalbytes,
 305                       maskblob, valuesblob);
 306}
 307
 308static int pmf_parser_read_cfg(struct pmf_cmd *cmd, struct pmf_handlers *h)
 309{
 310        u32 offset = pmf_next32(cmd);
 311        u32 bytes = pmf_next32(cmd);
 312
 313        LOG_PARSE("pmf: read_cfg(offset: %x, bytes: %ud)\n", offset, bytes);
 314
 315        PMF_PARSE_CALL(read_cfg, cmd, h, offset, bytes);
 316}
 317
 318
 319static int pmf_parser_write_cfg(struct pmf_cmd *cmd, struct pmf_handlers *h)
 320{
 321        u32 offset = pmf_next32(cmd);
 322        u32 bytes = pmf_next32(cmd);
 323        const void *blob = pmf_next_blob(cmd, bytes);
 324
 325        LOG_PARSE("pmf: write_cfg(offset: %x, bytes: %ud)\n", offset, bytes);
 326        LOG_BLOB("pmf:   data: \n", blob, bytes);
 327
 328        PMF_PARSE_CALL(write_cfg, cmd, h, offset, bytes, blob);
 329}
 330
 331static int pmf_parser_rmw_cfg(struct pmf_cmd *cmd, struct pmf_handlers *h)
 332{
 333        u32 offset = pmf_next32(cmd);
 334        u32 maskbytes = pmf_next32(cmd);
 335        u32 valuesbytes = pmf_next32(cmd);
 336        u32 totalbytes = pmf_next32(cmd);
 337        const void *maskblob = pmf_next_blob(cmd, maskbytes);
 338        const void *valuesblob = pmf_next_blob(cmd, valuesbytes);
 339
 340        LOG_PARSE("pmf: rmw_cfg(maskbytes: %ud, valuebytes: %ud,"
 341                  " totalbytes: %d) ...\n",
 342                  maskbytes, valuesbytes, totalbytes);
 343        LOG_BLOB("pmf:   mask data: \n", maskblob, maskbytes);
 344        LOG_BLOB("pmf:   values data: \n", valuesblob, valuesbytes);
 345
 346        PMF_PARSE_CALL(rmw_cfg, cmd, h, offset, maskbytes, valuesbytes,
 347                       totalbytes, maskblob, valuesblob);
 348}
 349
 350
 351static int pmf_parser_read_i2c_sub(struct pmf_cmd *cmd, struct pmf_handlers *h)
 352{
 353        u8 subaddr = (u8)pmf_next32(cmd);
 354        u32 bytes = pmf_next32(cmd);
 355
 356        LOG_PARSE("pmf: read_i2c_sub(subaddr: %x, bytes: %ud)\n",
 357                  subaddr, bytes);
 358
 359        PMF_PARSE_CALL(read_i2c_sub, cmd, h, subaddr, bytes);
 360}
 361
 362static int pmf_parser_write_i2c_sub(struct pmf_cmd *cmd, struct pmf_handlers *h)
 363{
 364        u8 subaddr = (u8)pmf_next32(cmd);
 365        u32 bytes = pmf_next32(cmd);
 366        const void *blob = pmf_next_blob(cmd, bytes);
 367
 368        LOG_PARSE("pmf: write_i2c_sub(subaddr: %x, bytes: %ud) ...\n",
 369                  subaddr, bytes);
 370        LOG_BLOB("pmf:   data: \n", blob, bytes);
 371
 372        PMF_PARSE_CALL(write_i2c_sub, cmd, h, subaddr, bytes, blob);
 373}
 374
 375static int pmf_parser_set_i2c_mode(struct pmf_cmd *cmd, struct pmf_handlers *h)
 376{
 377        u32 mode = pmf_next32(cmd);
 378
 379        LOG_PARSE("pmf: set_i2c_mode(mode: %d)\n", mode);
 380
 381        PMF_PARSE_CALL(set_i2c_mode, cmd, h, mode);
 382}
 383
 384
 385static int pmf_parser_rmw_i2c_sub(struct pmf_cmd *cmd, struct pmf_handlers *h)
 386{
 387        u8 subaddr = (u8)pmf_next32(cmd);
 388        u32 maskbytes = pmf_next32(cmd);
 389        u32 valuesbytes = pmf_next32(cmd);
 390        u32 totalbytes = pmf_next32(cmd);
 391        const void *maskblob = pmf_next_blob(cmd, maskbytes);
 392        const void *valuesblob = pmf_next_blob(cmd, valuesbytes);
 393
 394        LOG_PARSE("pmf: rmw_i2c_sub(subaddr: %x, maskbytes: %ud, valuebytes: %ud"
 395                  ", totalbytes: %d) ...\n",
 396                  subaddr, maskbytes, valuesbytes, totalbytes);
 397        LOG_BLOB("pmf:   mask data: \n", maskblob, maskbytes);
 398        LOG_BLOB("pmf:   values data: \n", valuesblob, valuesbytes);
 399
 400        PMF_PARSE_CALL(rmw_i2c_sub, cmd, h, subaddr, maskbytes, valuesbytes,
 401                       totalbytes, maskblob, valuesblob);
 402}
 403
 404static int pmf_parser_read_reg32_msrx(struct pmf_cmd *cmd,
 405                                      struct pmf_handlers *h)
 406{
 407        u32 offset = pmf_next32(cmd);
 408        u32 mask = pmf_next32(cmd);
 409        u32 shift = pmf_next32(cmd);
 410        u32 xor = pmf_next32(cmd);
 411
 412        LOG_PARSE("pmf: read_reg32_msrx(offset: %x, mask: %x, shift: %x,"
 413                  " xor: %x\n", offset, mask, shift, xor);
 414
 415        PMF_PARSE_CALL(read_reg32_msrx, cmd, h, offset, mask, shift, xor);
 416}
 417
 418static int pmf_parser_read_reg16_msrx(struct pmf_cmd *cmd,
 419                                      struct pmf_handlers *h)
 420{
 421        u32 offset = pmf_next32(cmd);
 422        u32 mask = pmf_next32(cmd);
 423        u32 shift = pmf_next32(cmd);
 424        u32 xor = pmf_next32(cmd);
 425
 426        LOG_PARSE("pmf: read_reg16_msrx(offset: %x, mask: %x, shift: %x,"
 427                  " xor: %x\n", offset, mask, shift, xor);
 428
 429        PMF_PARSE_CALL(read_reg16_msrx, cmd, h, offset, mask, shift, xor);
 430}
 431static int pmf_parser_read_reg8_msrx(struct pmf_cmd *cmd,
 432                                     struct pmf_handlers *h)
 433{
 434        u32 offset = pmf_next32(cmd);
 435        u32 mask = pmf_next32(cmd);
 436        u32 shift = pmf_next32(cmd);
 437        u32 xor = pmf_next32(cmd);
 438
 439        LOG_PARSE("pmf: read_reg8_msrx(offset: %x, mask: %x, shift: %x,"
 440                  " xor: %x\n", offset, mask, shift, xor);
 441
 442        PMF_PARSE_CALL(read_reg8_msrx, cmd, h, offset, mask, shift, xor);
 443}
 444
 445static int pmf_parser_write_reg32_slm(struct pmf_cmd *cmd,
 446                                      struct pmf_handlers *h)
 447{
 448        u32 offset = pmf_next32(cmd);
 449        u32 shift = pmf_next32(cmd);
 450        u32 mask = pmf_next32(cmd);
 451
 452        LOG_PARSE("pmf: write_reg32_slm(offset: %x, shift: %x, mask: %x\n",
 453                  offset, shift, mask);
 454
 455        PMF_PARSE_CALL(write_reg32_slm, cmd, h, offset, shift, mask);
 456}
 457
 458static int pmf_parser_write_reg16_slm(struct pmf_cmd *cmd,
 459                                      struct pmf_handlers *h)
 460{
 461        u32 offset = pmf_next32(cmd);
 462        u32 shift = pmf_next32(cmd);
 463        u32 mask = pmf_next32(cmd);
 464
 465        LOG_PARSE("pmf: write_reg16_slm(offset: %x, shift: %x, mask: %x\n",
 466                  offset, shift, mask);
 467
 468        PMF_PARSE_CALL(write_reg16_slm, cmd, h, offset, shift, mask);
 469}
 470
 471static int pmf_parser_write_reg8_slm(struct pmf_cmd *cmd,
 472                                     struct pmf_handlers *h)
 473{
 474        u32 offset = pmf_next32(cmd);
 475        u32 shift = pmf_next32(cmd);
 476        u32 mask = pmf_next32(cmd);
 477
 478        LOG_PARSE("pmf: write_reg8_slm(offset: %x, shift: %x, mask: %x\n",
 479                  offset, shift, mask);
 480
 481        PMF_PARSE_CALL(write_reg8_slm, cmd, h, offset, shift, mask);
 482}
 483
 484static int pmf_parser_mask_and_compare(struct pmf_cmd *cmd,
 485                                       struct pmf_handlers *h)
 486{
 487        u32 bytes = pmf_next32(cmd);
 488        const void *maskblob = pmf_next_blob(cmd, bytes);
 489        const void *valuesblob = pmf_next_blob(cmd, bytes);
 490
 491        LOG_PARSE("pmf: mask_and_compare(length: %ud ...\n", bytes);
 492        LOG_BLOB("pmf:   mask data: \n", maskblob, bytes);
 493        LOG_BLOB("pmf:   values data: \n", valuesblob, bytes);
 494
 495        PMF_PARSE_CALL(mask_and_compare, cmd, h,
 496                       bytes, maskblob, valuesblob);
 497}
 498
 499
 500typedef int (*pmf_cmd_parser_t)(struct pmf_cmd *cmd, struct pmf_handlers *h);
 501
 502static pmf_cmd_parser_t pmf_parsers[PMF_CMD_COUNT] =
 503{
 504        NULL,
 505        pmf_parser_write_gpio,
 506        pmf_parser_read_gpio,
 507        pmf_parser_write_reg32,
 508        pmf_parser_read_reg32,
 509        pmf_parser_write_reg16,
 510        pmf_parser_read_reg16,
 511        pmf_parser_write_reg8,
 512        pmf_parser_read_reg8,
 513        pmf_parser_delay,
 514        pmf_parser_wait_reg32,
 515        pmf_parser_wait_reg16,
 516        pmf_parser_wait_reg8,
 517        pmf_parser_read_i2c,
 518        pmf_parser_write_i2c,
 519        pmf_parser_rmw_i2c,
 520        NULL, /* Bogus command */
 521        NULL, /* Shift bytes right: NYI */
 522        NULL, /* Shift bytes left: NYI */
 523        pmf_parser_read_cfg,
 524        pmf_parser_write_cfg,
 525        pmf_parser_rmw_cfg,
 526        pmf_parser_read_i2c_sub,
 527        pmf_parser_write_i2c_sub,
 528        pmf_parser_set_i2c_mode,
 529        pmf_parser_rmw_i2c_sub,
 530        pmf_parser_read_reg32_msrx,
 531        pmf_parser_read_reg16_msrx,
 532        pmf_parser_read_reg8_msrx,
 533        pmf_parser_write_reg32_slm,
 534        pmf_parser_write_reg16_slm,
 535        pmf_parser_write_reg8_slm,
 536        pmf_parser_mask_and_compare,
 537};
 538
 539struct pmf_device {
 540        struct list_head        link;
 541        struct device_node      *node;
 542        struct pmf_handlers     *handlers;
 543        struct list_head        functions;
 544        struct kref             ref;
 545};
 546
 547static LIST_HEAD(pmf_devices);
 548static DEFINE_SPINLOCK(pmf_lock);
 549static DEFINE_MUTEX(pmf_irq_mutex);
 550
 551static void pmf_release_device(struct kref *kref)
 552{
 553        struct pmf_device *dev = container_of(kref, struct pmf_device, ref);
 554        kfree(dev);
 555}
 556
 557static inline void pmf_put_device(struct pmf_device *dev)
 558{
 559        kref_put(&dev->ref, pmf_release_device);
 560}
 561
 562static inline struct pmf_device *pmf_get_device(struct pmf_device *dev)
 563{
 564        kref_get(&dev->ref);
 565        return dev;
 566}
 567
 568static inline struct pmf_device *pmf_find_device(struct device_node *np)
 569{
 570        struct pmf_device *dev;
 571
 572        list_for_each_entry(dev, &pmf_devices, link) {
 573                if (dev->node == np)
 574                        return pmf_get_device(dev);
 575        }
 576        return NULL;
 577}
 578
 579static int pmf_parse_one(struct pmf_function *func,
 580                         struct pmf_handlers *handlers,
 581                         void *instdata, struct pmf_args *args)
 582{
 583        struct pmf_cmd cmd;
 584        u32 ccode;
 585        int count, rc;
 586
 587        cmd.cmdptr              = func->data;
 588        cmd.cmdend              = func->data + func->length;
 589        cmd.func                = func;
 590        cmd.instdata            = instdata;
 591        cmd.args                = args;
 592        cmd.error               = 0;
 593
 594        LOG_PARSE("pmf: func %s, %d bytes, %s...\n",
 595                  func->name, func->length,
 596                  handlers ? "executing" : "parsing");
 597
 598        /* One subcommand to parse for now */
 599        count = 1;
 600
 601        while(count-- && cmd.cmdptr < cmd.cmdend) {
 602                /* Get opcode */
 603                ccode = pmf_next32(&cmd);
 604                /* Check if we are hitting a command list, fetch new count */
 605                if (ccode == 0) {
 606                        count = pmf_next32(&cmd) - 1;
 607                        ccode = pmf_next32(&cmd);
 608                }
 609                if (cmd.error) {
 610                        LOG_ERROR("pmf: parse error, not enough data\n");
 611                        return -ENXIO;
 612                }
 613                if (ccode >= PMF_CMD_COUNT) {
 614                        LOG_ERROR("pmf: command code %d unknown !\n", ccode);
 615                        return -ENXIO;
 616                }
 617                if (pmf_parsers[ccode] == NULL) {
 618                        LOG_ERROR("pmf: no parser for command %d !\n", ccode);
 619                        return -ENXIO;
 620                }
 621                rc = pmf_parsers[ccode](&cmd, handlers);
 622                if (rc != 0) {
 623                        LOG_ERROR("pmf: parser for command %d returned"
 624                                  " error %d\n", ccode, rc);
 625                        return rc;
 626                }
 627        }
 628
 629        /* We are doing an initial parse pass, we need to adjust the size */
 630        if (handlers == NULL)
 631                func->length = cmd.cmdptr - func->data;
 632
 633        return 0;
 634}
 635
 636static int pmf_add_function_prop(struct pmf_device *dev, void *driverdata,
 637                                 const char *name, u32 *data,
 638                                 unsigned int length)
 639{
 640        int count = 0;
 641        struct pmf_function *func = NULL;
 642
 643        DBG("pmf: Adding functions for platform-do-%s\n", name);
 644
 645        while (length >= 12) {
 646                /* Allocate a structure */
 647                func = kzalloc(sizeof(struct pmf_function), GFP_KERNEL);
 648                if (func == NULL)
 649                        goto bail;
 650                kref_init(&func->ref);
 651                INIT_LIST_HEAD(&func->irq_clients);
 652                func->node = dev->node;
 653                func->driver_data = driverdata;
 654                func->name = name;
 655                func->phandle = data[0];
 656                func->flags = data[1];
 657                data += 2;
 658                length -= 8;
 659                func->data = data;
 660                func->length = length;
 661                func->dev = dev;
 662                DBG("pmf: idx %d: flags=%08x, phandle=%08x "
 663                    " %d bytes remaining, parsing...\n",
 664                    count+1, func->flags, func->phandle, length);
 665                if (pmf_parse_one(func, NULL, NULL, NULL)) {
 666                        kfree(func);
 667                        goto bail;
 668                }
 669                length -= func->length;
 670                data = (u32 *)(((u8 *)data) + func->length);
 671                list_add(&func->link, &dev->functions);
 672                pmf_get_device(dev);
 673                count++;
 674        }
 675 bail:
 676        DBG("pmf: Added %d functions\n", count);
 677
 678        return count;
 679}
 680
 681static int pmf_add_functions(struct pmf_device *dev, void *driverdata)
 682{
 683        struct property *pp;
 684#define PP_PREFIX "platform-do-"
 685        const int plen = strlen(PP_PREFIX);
 686        int count = 0;
 687
 688        for (pp = dev->node->properties; pp != 0; pp = pp->next) {
 689                const char *name;
 690                if (strncmp(pp->name, PP_PREFIX, plen) != 0)
 691                        continue;
 692                name = pp->name + plen;
 693                if (strlen(name) && pp->length >= 12)
 694                        count += pmf_add_function_prop(dev, driverdata, name,
 695                                                       pp->value, pp->length);
 696        }
 697        return count;
 698}
 699
 700
 701int pmf_register_driver(struct device_node *np,
 702                        struct pmf_handlers *handlers,
 703                        void *driverdata)
 704{
 705        struct pmf_device *dev;
 706        unsigned long flags;
 707        int rc = 0;
 708
 709        if (handlers == NULL)
 710                return -EINVAL;
 711
 712        DBG("pmf: registering driver for node %s\n", np->full_name);
 713
 714        spin_lock_irqsave(&pmf_lock, flags);
 715        dev = pmf_find_device(np);
 716        spin_unlock_irqrestore(&pmf_lock, flags);
 717        if (dev != NULL) {
 718                DBG("pmf: already there !\n");
 719                pmf_put_device(dev);
 720                return -EBUSY;
 721        }
 722
 723        dev = kzalloc(sizeof(struct pmf_device), GFP_KERNEL);
 724        if (dev == NULL) {
 725                DBG("pmf: no memory !\n");
 726                return -ENOMEM;
 727        }
 728        kref_init(&dev->ref);
 729        dev->node = of_node_get(np);
 730        dev->handlers = handlers;
 731        INIT_LIST_HEAD(&dev->functions);
 732
 733        rc = pmf_add_functions(dev, driverdata);
 734        if (rc == 0) {
 735                DBG("pmf: no functions, disposing.. \n");
 736                of_node_put(np);
 737                kfree(dev);
 738                return -ENODEV;
 739        }
 740
 741        spin_lock_irqsave(&pmf_lock, flags);
 742        list_add(&dev->link, &pmf_devices);
 743        spin_unlock_irqrestore(&pmf_lock, flags);
 744
 745        return 0;
 746}
 747EXPORT_SYMBOL_GPL(pmf_register_driver);
 748
 749struct pmf_function *pmf_get_function(struct pmf_function *func)
 750{
 751        if (!try_module_get(func->dev->handlers->owner))
 752                return NULL;
 753        kref_get(&func->ref);
 754        return func;
 755}
 756EXPORT_SYMBOL_GPL(pmf_get_function);
 757
 758static void pmf_release_function(struct kref *kref)
 759{
 760        struct pmf_function *func =
 761                container_of(kref, struct pmf_function, ref);
 762        pmf_put_device(func->dev);
 763        kfree(func);
 764}
 765
 766static inline void __pmf_put_function(struct pmf_function *func)
 767{
 768        kref_put(&func->ref, pmf_release_function);
 769}
 770
 771void pmf_put_function(struct pmf_function *func)
 772{
 773        if (func == NULL)
 774                return;
 775        module_put(func->dev->handlers->owner);
 776        __pmf_put_function(func);
 777}
 778EXPORT_SYMBOL_GPL(pmf_put_function);
 779
 780void pmf_unregister_driver(struct device_node *np)
 781{
 782        struct pmf_device *dev;
 783        unsigned long flags;
 784
 785        DBG("pmf: unregistering driver for node %s\n", np->full_name);
 786
 787        spin_lock_irqsave(&pmf_lock, flags);
 788        dev = pmf_find_device(np);
 789        if (dev == NULL) {
 790                DBG("pmf: not such driver !\n");
 791                spin_unlock_irqrestore(&pmf_lock, flags);
 792                return;
 793        }
 794        list_del(&dev->link);
 795
 796        while(!list_empty(&dev->functions)) {
 797                struct pmf_function *func =
 798                        list_entry(dev->functions.next, typeof(*func), link);
 799                list_del(&func->link);
 800                __pmf_put_function(func);
 801        }
 802
 803        pmf_put_device(dev);
 804        spin_unlock_irqrestore(&pmf_lock, flags);
 805}
 806EXPORT_SYMBOL_GPL(pmf_unregister_driver);
 807
 808struct pmf_function *__pmf_find_function(struct device_node *target,
 809                                         const char *name, u32 flags)
 810{
 811        struct device_node *actor = of_node_get(target);
 812        struct pmf_device *dev;
 813        struct pmf_function *func, *result = NULL;
 814        char fname[64];
 815        const u32 *prop;
 816        u32 ph;
 817
 818        /*
 819         * Look for a "platform-*" function reference. If we can't find
 820         * one, then we fallback to a direct call attempt
 821         */
 822        snprintf(fname, 63, "platform-%s", name);
 823        prop = of_get_property(target, fname, NULL);
 824        if (prop == NULL)
 825                goto find_it;
 826        ph = *prop;
 827        if (ph == 0)
 828                goto find_it;
 829
 830        /*
 831         * Ok, now try to find the actor. If we can't find it, we fail,
 832         * there is no point in falling back there
 833         */
 834        of_node_put(actor);
 835        actor = of_find_node_by_phandle(ph);
 836        if (actor == NULL)
 837                return NULL;
 838 find_it:
 839        dev = pmf_find_device(actor);
 840        if (dev == NULL) {
 841                result = NULL;
 842                goto out;
 843        }
 844
 845        list_for_each_entry(func, &dev->functions, link) {
 846                if (name && strcmp(name, func->name))
 847                        continue;
 848                if (func->phandle && target->phandle != func->phandle)
 849                        continue;
 850                if ((func->flags & flags) == 0)
 851                        continue;
 852                result = func;
 853                break;
 854        }
 855        pmf_put_device(dev);
 856out:
 857        of_node_put(actor);
 858        return result;
 859}
 860
 861
 862int pmf_register_irq_client(struct device_node *target,
 863                            const char *name,
 864                            struct pmf_irq_client *client)
 865{
 866        struct pmf_function *func;
 867        unsigned long flags;
 868
 869        spin_lock_irqsave(&pmf_lock, flags);
 870        func = __pmf_find_function(target, name, PMF_FLAGS_INT_GEN);
 871        if (func)
 872                func = pmf_get_function(func);
 873        spin_unlock_irqrestore(&pmf_lock, flags);
 874        if (func == NULL)
 875                return -ENODEV;
 876
 877        /* guard against manipulations of list */
 878        mutex_lock(&pmf_irq_mutex);
 879        if (list_empty(&func->irq_clients))
 880                func->dev->handlers->irq_enable(func);
 881
 882        /* guard against pmf_do_irq while changing list */
 883        spin_lock_irqsave(&pmf_lock, flags);
 884        list_add(&client->link, &func->irq_clients);
 885        spin_unlock_irqrestore(&pmf_lock, flags);
 886
 887        client->func = func;
 888        mutex_unlock(&pmf_irq_mutex);
 889
 890        return 0;
 891}
 892EXPORT_SYMBOL_GPL(pmf_register_irq_client);
 893
 894void pmf_unregister_irq_client(struct pmf_irq_client *client)
 895{
 896        struct pmf_function *func = client->func;
 897        unsigned long flags;
 898
 899        BUG_ON(func == NULL);
 900
 901        /* guard against manipulations of list */
 902        mutex_lock(&pmf_irq_mutex);
 903        client->func = NULL;
 904
 905        /* guard against pmf_do_irq while changing list */
 906        spin_lock_irqsave(&pmf_lock, flags);
 907        list_del(&client->link);
 908        spin_unlock_irqrestore(&pmf_lock, flags);
 909
 910        if (list_empty(&func->irq_clients))
 911                func->dev->handlers->irq_disable(func);
 912        mutex_unlock(&pmf_irq_mutex);
 913        pmf_put_function(func);
 914}
 915EXPORT_SYMBOL_GPL(pmf_unregister_irq_client);
 916
 917
 918void pmf_do_irq(struct pmf_function *func)
 919{
 920        unsigned long flags;
 921        struct pmf_irq_client *client;
 922
 923        /* For now, using a spinlock over the whole function. Can be made
 924         * to drop the lock using 2 lists if necessary
 925         */
 926        spin_lock_irqsave(&pmf_lock, flags);
 927        list_for_each_entry(client, &func->irq_clients, link) {
 928                if (!try_module_get(client->owner))
 929                        continue;
 930                client->handler(client->data);
 931                module_put(client->owner);
 932        }
 933        spin_unlock_irqrestore(&pmf_lock, flags);
 934}
 935EXPORT_SYMBOL_GPL(pmf_do_irq);
 936
 937
 938int pmf_call_one(struct pmf_function *func, struct pmf_args *args)
 939{
 940        struct pmf_device *dev = func->dev;
 941        void *instdata = NULL;
 942        int rc = 0;
 943
 944        DBG(" ** pmf_call_one(%s/%s) **\n", dev->node->full_name, func->name);
 945
 946        if (dev->handlers->begin)
 947                instdata = dev->handlers->begin(func, args);
 948        rc = pmf_parse_one(func, dev->handlers, instdata, args);
 949        if (dev->handlers->end)
 950                dev->handlers->end(func, instdata);
 951
 952        return rc;
 953}
 954EXPORT_SYMBOL_GPL(pmf_call_one);
 955
 956int pmf_do_functions(struct device_node *np, const char *name,
 957                     u32 phandle, u32 fflags, struct pmf_args *args)
 958{
 959        struct pmf_device *dev;
 960        struct pmf_function *func, *tmp;
 961        unsigned long flags;
 962        int rc = -ENODEV;
 963
 964        spin_lock_irqsave(&pmf_lock, flags);
 965
 966        dev = pmf_find_device(np);
 967        if (dev == NULL) {
 968                spin_unlock_irqrestore(&pmf_lock, flags);
 969                return -ENODEV;
 970        }
 971        list_for_each_entry_safe(func, tmp, &dev->functions, link) {
 972                if (name && strcmp(name, func->name))
 973                        continue;
 974                if (phandle && func->phandle && phandle != func->phandle)
 975                        continue;
 976                if ((func->flags & fflags) == 0)
 977                        continue;
 978                if (pmf_get_function(func) == NULL)
 979                        continue;
 980                spin_unlock_irqrestore(&pmf_lock, flags);
 981                rc = pmf_call_one(func, args);
 982                pmf_put_function(func);
 983                spin_lock_irqsave(&pmf_lock, flags);
 984        }
 985        pmf_put_device(dev);
 986        spin_unlock_irqrestore(&pmf_lock, flags);
 987
 988        return rc;
 989}
 990EXPORT_SYMBOL_GPL(pmf_do_functions);
 991
 992
 993struct pmf_function *pmf_find_function(struct device_node *target,
 994                                       const char *name)
 995{
 996        struct pmf_function *func;
 997        unsigned long flags;
 998
 999        spin_lock_irqsave(&pmf_lock, flags);
1000        func = __pmf_find_function(target, name, PMF_FLAGS_ON_DEMAND);
1001        if (func)
1002                func = pmf_get_function(func);
1003        spin_unlock_irqrestore(&pmf_lock, flags);
1004        return func;
1005}
1006EXPORT_SYMBOL_GPL(pmf_find_function);
1007
1008int pmf_call_function(struct device_node *target, const char *name,
1009                      struct pmf_args *args)
1010{
1011        struct pmf_function *func = pmf_find_function(target, name);
1012        int rc;
1013
1014        if (func == NULL)
1015                return -ENODEV;
1016
1017        rc = pmf_call_one(func, args);
1018        pmf_put_function(func);
1019        return rc;
1020}
1021EXPORT_SYMBOL_GPL(pmf_call_function);
1022
1023