atom.c revision 5801ead6bd6bddf5505d6eab55f84d8ee8106cd8
1/* 2 * Copyright 2008 Advanced Micro Devices, Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 * Author: Stanislaw Skowronek 23 */ 24 25#include <linux/module.h> 26#include <linux/sched.h> 27 28#define ATOM_DEBUG 29 30#include "atom.h" 31#include "atom-names.h" 32#include "atom-bits.h" 33 34#define ATOM_COND_ABOVE 0 35#define ATOM_COND_ABOVEOREQUAL 1 36#define ATOM_COND_ALWAYS 2 37#define ATOM_COND_BELOW 3 38#define ATOM_COND_BELOWOREQUAL 4 39#define ATOM_COND_EQUAL 5 40#define ATOM_COND_NOTEQUAL 6 41 42#define ATOM_PORT_ATI 0 43#define ATOM_PORT_PCI 1 44#define ATOM_PORT_SYSIO 2 45 46#define ATOM_UNIT_MICROSEC 0 47#define ATOM_UNIT_MILLISEC 1 48 49#define PLL_INDEX 2 50#define PLL_DATA 3 51 52typedef struct { 53 struct atom_context *ctx; 54 55 uint32_t *ps, *ws; 56 int ps_shift; 57 uint16_t start; 58} atom_exec_context; 59 60int atom_debug = 0; 61void atom_execute_table(struct atom_context *ctx, int index, uint32_t * params); 62 63static uint32_t atom_arg_mask[8] = 64 { 0xFFFFFFFF, 0xFFFF, 0xFFFF00, 0xFFFF0000, 0xFF, 0xFF00, 0xFF0000, 650xFF000000 }; 66static int atom_arg_shift[8] = { 0, 0, 8, 16, 0, 8, 16, 24 }; 67 68static int atom_dst_to_src[8][4] = { 69 /* translate destination alignment field to the source alignment encoding */ 70 {0, 0, 0, 0}, 71 {1, 2, 3, 0}, 72 {1, 2, 3, 0}, 73 {1, 2, 3, 0}, 74 {4, 5, 6, 7}, 75 {4, 5, 6, 7}, 76 {4, 5, 6, 7}, 77 {4, 5, 6, 7}, 78}; 79static int atom_def_dst[8] = { 0, 0, 1, 2, 0, 1, 2, 3 }; 80 81static int debug_depth = 0; 82#ifdef ATOM_DEBUG 83static void debug_print_spaces(int n) 84{ 85 while (n--) 86 printk(" "); 87} 88 89#define DEBUG(...) do if (atom_debug) { printk(KERN_DEBUG __VA_ARGS__); } while (0) 90#define SDEBUG(...) do if (atom_debug) { printk(KERN_DEBUG); debug_print_spaces(debug_depth); printk(__VA_ARGS__); } while (0) 91#else 92#define DEBUG(...) do { } while (0) 93#define SDEBUG(...) do { } while (0) 94#endif 95 96static uint32_t atom_iio_execute(struct atom_context *ctx, int base, 97 uint32_t index, uint32_t data) 98{ 99 uint32_t temp = 0xCDCDCDCD; 100 while (1) 101 switch (CU8(base)) { 102 case ATOM_IIO_NOP: 103 base++; 104 break; 105 case ATOM_IIO_READ: 106 temp = ctx->card->reg_read(ctx->card, CU16(base + 1)); 107 base += 3; 108 break; 109 case ATOM_IIO_WRITE: 110 (void)ctx->card->reg_read(ctx->card, CU16(base + 1)); 111 ctx->card->reg_write(ctx->card, CU16(base + 1), temp); 112 base += 3; 113 break; 114 case ATOM_IIO_CLEAR: 115 temp &= 116 ~((0xFFFFFFFF >> (32 - CU8(base + 1))) << 117 CU8(base + 2)); 118 base += 3; 119 break; 120 case ATOM_IIO_SET: 121 temp |= 122 (0xFFFFFFFF >> (32 - CU8(base + 1))) << CU8(base + 123 2); 124 base += 3; 125 break; 126 case ATOM_IIO_MOVE_INDEX: 127 temp &= 128 ~((0xFFFFFFFF >> (32 - CU8(base + 1))) << 129 CU8(base + 2)); 130 temp |= 131 ((index >> CU8(base + 2)) & 132 (0xFFFFFFFF >> (32 - CU8(base + 1)))) << CU8(base + 133 3); 134 base += 4; 135 break; 136 case ATOM_IIO_MOVE_DATA: 137 temp &= 138 ~((0xFFFFFFFF >> (32 - CU8(base + 1))) << 139 CU8(base + 2)); 140 temp |= 141 ((data >> CU8(base + 2)) & 142 (0xFFFFFFFF >> (32 - CU8(base + 1)))) << CU8(base + 143 3); 144 base += 4; 145 break; 146 case ATOM_IIO_MOVE_ATTR: 147 temp &= 148 ~((0xFFFFFFFF >> (32 - CU8(base + 1))) << 149 CU8(base + 2)); 150 temp |= 151 ((ctx-> 152 io_attr >> CU8(base + 2)) & (0xFFFFFFFF >> (32 - 153 CU8 154 (base 155 + 156 1)))) 157 << CU8(base + 3); 158 base += 4; 159 break; 160 case ATOM_IIO_END: 161 return temp; 162 default: 163 printk(KERN_INFO "Unknown IIO opcode.\n"); 164 return 0; 165 } 166} 167 168static uint32_t atom_get_src_int(atom_exec_context *ctx, uint8_t attr, 169 int *ptr, uint32_t *saved, int print) 170{ 171 uint32_t idx, val = 0xCDCDCDCD, align, arg; 172 struct atom_context *gctx = ctx->ctx; 173 arg = attr & 7; 174 align = (attr >> 3) & 7; 175 switch (arg) { 176 case ATOM_ARG_REG: 177 idx = U16(*ptr); 178 (*ptr) += 2; 179 if (print) 180 DEBUG("REG[0x%04X]", idx); 181 idx += gctx->reg_block; 182 switch (gctx->io_mode) { 183 case ATOM_IO_MM: 184 val = gctx->card->reg_read(gctx->card, idx); 185 break; 186 case ATOM_IO_PCI: 187 printk(KERN_INFO 188 "PCI registers are not implemented.\n"); 189 return 0; 190 case ATOM_IO_SYSIO: 191 printk(KERN_INFO 192 "SYSIO registers are not implemented.\n"); 193 return 0; 194 default: 195 if (!(gctx->io_mode & 0x80)) { 196 printk(KERN_INFO "Bad IO mode.\n"); 197 return 0; 198 } 199 if (!gctx->iio[gctx->io_mode & 0x7F]) { 200 printk(KERN_INFO 201 "Undefined indirect IO read method %d.\n", 202 gctx->io_mode & 0x7F); 203 return 0; 204 } 205 val = 206 atom_iio_execute(gctx, 207 gctx->iio[gctx->io_mode & 0x7F], 208 idx, 0); 209 } 210 break; 211 case ATOM_ARG_PS: 212 idx = U8(*ptr); 213 (*ptr)++; 214 val = le32_to_cpu(ctx->ps[idx]); 215 if (print) 216 DEBUG("PS[0x%02X,0x%04X]", idx, val); 217 break; 218 case ATOM_ARG_WS: 219 idx = U8(*ptr); 220 (*ptr)++; 221 if (print) 222 DEBUG("WS[0x%02X]", idx); 223 switch (idx) { 224 case ATOM_WS_QUOTIENT: 225 val = gctx->divmul[0]; 226 break; 227 case ATOM_WS_REMAINDER: 228 val = gctx->divmul[1]; 229 break; 230 case ATOM_WS_DATAPTR: 231 val = gctx->data_block; 232 break; 233 case ATOM_WS_SHIFT: 234 val = gctx->shift; 235 break; 236 case ATOM_WS_OR_MASK: 237 val = 1 << gctx->shift; 238 break; 239 case ATOM_WS_AND_MASK: 240 val = ~(1 << gctx->shift); 241 break; 242 case ATOM_WS_FB_WINDOW: 243 val = gctx->fb_base; 244 break; 245 case ATOM_WS_ATTRIBUTES: 246 val = gctx->io_attr; 247 break; 248 default: 249 val = ctx->ws[idx]; 250 } 251 break; 252 case ATOM_ARG_ID: 253 idx = U16(*ptr); 254 (*ptr) += 2; 255 if (print) { 256 if (gctx->data_block) 257 DEBUG("ID[0x%04X+%04X]", idx, gctx->data_block); 258 else 259 DEBUG("ID[0x%04X]", idx); 260 } 261 val = U32(idx + gctx->data_block); 262 break; 263 case ATOM_ARG_FB: 264 idx = U8(*ptr); 265 (*ptr)++; 266 val = gctx->scratch[((gctx->fb_base + idx) / 4)]; 267 if (print) 268 DEBUG("FB[0x%02X]", idx); 269 break; 270 case ATOM_ARG_IMM: 271 switch (align) { 272 case ATOM_SRC_DWORD: 273 val = U32(*ptr); 274 (*ptr) += 4; 275 if (print) 276 DEBUG("IMM 0x%08X\n", val); 277 return val; 278 case ATOM_SRC_WORD0: 279 case ATOM_SRC_WORD8: 280 case ATOM_SRC_WORD16: 281 val = U16(*ptr); 282 (*ptr) += 2; 283 if (print) 284 DEBUG("IMM 0x%04X\n", val); 285 return val; 286 case ATOM_SRC_BYTE0: 287 case ATOM_SRC_BYTE8: 288 case ATOM_SRC_BYTE16: 289 case ATOM_SRC_BYTE24: 290 val = U8(*ptr); 291 (*ptr)++; 292 if (print) 293 DEBUG("IMM 0x%02X\n", val); 294 return val; 295 } 296 return 0; 297 case ATOM_ARG_PLL: 298 idx = U8(*ptr); 299 (*ptr)++; 300 if (print) 301 DEBUG("PLL[0x%02X]", idx); 302 val = gctx->card->pll_read(gctx->card, idx); 303 break; 304 case ATOM_ARG_MC: 305 idx = U8(*ptr); 306 (*ptr)++; 307 if (print) 308 DEBUG("MC[0x%02X]", idx); 309 val = gctx->card->mc_read(gctx->card, idx); 310 break; 311 } 312 if (saved) 313 *saved = val; 314 val &= atom_arg_mask[align]; 315 val >>= atom_arg_shift[align]; 316 if (print) 317 switch (align) { 318 case ATOM_SRC_DWORD: 319 DEBUG(".[31:0] -> 0x%08X\n", val); 320 break; 321 case ATOM_SRC_WORD0: 322 DEBUG(".[15:0] -> 0x%04X\n", val); 323 break; 324 case ATOM_SRC_WORD8: 325 DEBUG(".[23:8] -> 0x%04X\n", val); 326 break; 327 case ATOM_SRC_WORD16: 328 DEBUG(".[31:16] -> 0x%04X\n", val); 329 break; 330 case ATOM_SRC_BYTE0: 331 DEBUG(".[7:0] -> 0x%02X\n", val); 332 break; 333 case ATOM_SRC_BYTE8: 334 DEBUG(".[15:8] -> 0x%02X\n", val); 335 break; 336 case ATOM_SRC_BYTE16: 337 DEBUG(".[23:16] -> 0x%02X\n", val); 338 break; 339 case ATOM_SRC_BYTE24: 340 DEBUG(".[31:24] -> 0x%02X\n", val); 341 break; 342 } 343 return val; 344} 345 346static void atom_skip_src_int(atom_exec_context *ctx, uint8_t attr, int *ptr) 347{ 348 uint32_t align = (attr >> 3) & 7, arg = attr & 7; 349 switch (arg) { 350 case ATOM_ARG_REG: 351 case ATOM_ARG_ID: 352 (*ptr) += 2; 353 break; 354 case ATOM_ARG_PLL: 355 case ATOM_ARG_MC: 356 case ATOM_ARG_PS: 357 case ATOM_ARG_WS: 358 case ATOM_ARG_FB: 359 (*ptr)++; 360 break; 361 case ATOM_ARG_IMM: 362 switch (align) { 363 case ATOM_SRC_DWORD: 364 (*ptr) += 4; 365 return; 366 case ATOM_SRC_WORD0: 367 case ATOM_SRC_WORD8: 368 case ATOM_SRC_WORD16: 369 (*ptr) += 2; 370 return; 371 case ATOM_SRC_BYTE0: 372 case ATOM_SRC_BYTE8: 373 case ATOM_SRC_BYTE16: 374 case ATOM_SRC_BYTE24: 375 (*ptr)++; 376 return; 377 } 378 return; 379 } 380} 381 382static uint32_t atom_get_src(atom_exec_context *ctx, uint8_t attr, int *ptr) 383{ 384 return atom_get_src_int(ctx, attr, ptr, NULL, 1); 385} 386 387static uint32_t atom_get_dst(atom_exec_context *ctx, int arg, uint8_t attr, 388 int *ptr, uint32_t *saved, int print) 389{ 390 return atom_get_src_int(ctx, 391 arg | atom_dst_to_src[(attr >> 3) & 392 7][(attr >> 6) & 3] << 3, 393 ptr, saved, print); 394} 395 396static void atom_skip_dst(atom_exec_context *ctx, int arg, uint8_t attr, int *ptr) 397{ 398 atom_skip_src_int(ctx, 399 arg | atom_dst_to_src[(attr >> 3) & 7][(attr >> 6) & 400 3] << 3, ptr); 401} 402 403static void atom_put_dst(atom_exec_context *ctx, int arg, uint8_t attr, 404 int *ptr, uint32_t val, uint32_t saved) 405{ 406 uint32_t align = 407 atom_dst_to_src[(attr >> 3) & 7][(attr >> 6) & 3], old_val = 408 val, idx; 409 struct atom_context *gctx = ctx->ctx; 410 old_val &= atom_arg_mask[align] >> atom_arg_shift[align]; 411 val <<= atom_arg_shift[align]; 412 val &= atom_arg_mask[align]; 413 saved &= ~atom_arg_mask[align]; 414 val |= saved; 415 switch (arg) { 416 case ATOM_ARG_REG: 417 idx = U16(*ptr); 418 (*ptr) += 2; 419 DEBUG("REG[0x%04X]", idx); 420 idx += gctx->reg_block; 421 switch (gctx->io_mode) { 422 case ATOM_IO_MM: 423 if (idx == 0) 424 gctx->card->reg_write(gctx->card, idx, 425 val << 2); 426 else 427 gctx->card->reg_write(gctx->card, idx, val); 428 break; 429 case ATOM_IO_PCI: 430 printk(KERN_INFO 431 "PCI registers are not implemented.\n"); 432 return; 433 case ATOM_IO_SYSIO: 434 printk(KERN_INFO 435 "SYSIO registers are not implemented.\n"); 436 return; 437 default: 438 if (!(gctx->io_mode & 0x80)) { 439 printk(KERN_INFO "Bad IO mode.\n"); 440 return; 441 } 442 if (!gctx->iio[gctx->io_mode & 0xFF]) { 443 printk(KERN_INFO 444 "Undefined indirect IO write method %d.\n", 445 gctx->io_mode & 0x7F); 446 return; 447 } 448 atom_iio_execute(gctx, gctx->iio[gctx->io_mode & 0xFF], 449 idx, val); 450 } 451 break; 452 case ATOM_ARG_PS: 453 idx = U8(*ptr); 454 (*ptr)++; 455 DEBUG("PS[0x%02X]", idx); 456 ctx->ps[idx] = cpu_to_le32(val); 457 break; 458 case ATOM_ARG_WS: 459 idx = U8(*ptr); 460 (*ptr)++; 461 DEBUG("WS[0x%02X]", idx); 462 switch (idx) { 463 case ATOM_WS_QUOTIENT: 464 gctx->divmul[0] = val; 465 break; 466 case ATOM_WS_REMAINDER: 467 gctx->divmul[1] = val; 468 break; 469 case ATOM_WS_DATAPTR: 470 gctx->data_block = val; 471 break; 472 case ATOM_WS_SHIFT: 473 gctx->shift = val; 474 break; 475 case ATOM_WS_OR_MASK: 476 case ATOM_WS_AND_MASK: 477 break; 478 case ATOM_WS_FB_WINDOW: 479 gctx->fb_base = val; 480 break; 481 case ATOM_WS_ATTRIBUTES: 482 gctx->io_attr = val; 483 break; 484 default: 485 ctx->ws[idx] = val; 486 } 487 break; 488 case ATOM_ARG_FB: 489 idx = U8(*ptr); 490 (*ptr)++; 491 gctx->scratch[((gctx->fb_base + idx) / 4)] = val; 492 DEBUG("FB[0x%02X]", idx); 493 break; 494 case ATOM_ARG_PLL: 495 idx = U8(*ptr); 496 (*ptr)++; 497 DEBUG("PLL[0x%02X]", idx); 498 gctx->card->pll_write(gctx->card, idx, val); 499 break; 500 case ATOM_ARG_MC: 501 idx = U8(*ptr); 502 (*ptr)++; 503 DEBUG("MC[0x%02X]", idx); 504 gctx->card->mc_write(gctx->card, idx, val); 505 return; 506 } 507 switch (align) { 508 case ATOM_SRC_DWORD: 509 DEBUG(".[31:0] <- 0x%08X\n", old_val); 510 break; 511 case ATOM_SRC_WORD0: 512 DEBUG(".[15:0] <- 0x%04X\n", old_val); 513 break; 514 case ATOM_SRC_WORD8: 515 DEBUG(".[23:8] <- 0x%04X\n", old_val); 516 break; 517 case ATOM_SRC_WORD16: 518 DEBUG(".[31:16] <- 0x%04X\n", old_val); 519 break; 520 case ATOM_SRC_BYTE0: 521 DEBUG(".[7:0] <- 0x%02X\n", old_val); 522 break; 523 case ATOM_SRC_BYTE8: 524 DEBUG(".[15:8] <- 0x%02X\n", old_val); 525 break; 526 case ATOM_SRC_BYTE16: 527 DEBUG(".[23:16] <- 0x%02X\n", old_val); 528 break; 529 case ATOM_SRC_BYTE24: 530 DEBUG(".[31:24] <- 0x%02X\n", old_val); 531 break; 532 } 533} 534 535static void atom_op_add(atom_exec_context *ctx, int *ptr, int arg) 536{ 537 uint8_t attr = U8((*ptr)++); 538 uint32_t dst, src, saved; 539 int dptr = *ptr; 540 SDEBUG(" dst: "); 541 dst = atom_get_dst(ctx, arg, attr, ptr, &saved, 1); 542 SDEBUG(" src: "); 543 src = atom_get_src(ctx, attr, ptr); 544 dst += src; 545 SDEBUG(" dst: "); 546 atom_put_dst(ctx, arg, attr, &dptr, dst, saved); 547} 548 549static void atom_op_and(atom_exec_context *ctx, int *ptr, int arg) 550{ 551 uint8_t attr = U8((*ptr)++); 552 uint32_t dst, src, saved; 553 int dptr = *ptr; 554 SDEBUG(" dst: "); 555 dst = atom_get_dst(ctx, arg, attr, ptr, &saved, 1); 556 SDEBUG(" src: "); 557 src = atom_get_src(ctx, attr, ptr); 558 dst &= src; 559 SDEBUG(" dst: "); 560 atom_put_dst(ctx, arg, attr, &dptr, dst, saved); 561} 562 563static void atom_op_beep(atom_exec_context *ctx, int *ptr, int arg) 564{ 565 printk("ATOM BIOS beeped!\n"); 566} 567 568static void atom_op_calltable(atom_exec_context *ctx, int *ptr, int arg) 569{ 570 int idx = U8((*ptr)++); 571 if (idx < ATOM_TABLE_NAMES_CNT) 572 SDEBUG(" table: %d (%s)\n", idx, atom_table_names[idx]); 573 else 574 SDEBUG(" table: %d\n", idx); 575 if (U16(ctx->ctx->cmd_table + 4 + 2 * idx)) 576 atom_execute_table(ctx->ctx, idx, ctx->ps + ctx->ps_shift); 577} 578 579static void atom_op_clear(atom_exec_context *ctx, int *ptr, int arg) 580{ 581 uint8_t attr = U8((*ptr)++); 582 uint32_t saved; 583 int dptr = *ptr; 584 attr &= 0x38; 585 attr |= atom_def_dst[attr >> 3] << 6; 586 atom_get_dst(ctx, arg, attr, ptr, &saved, 0); 587 SDEBUG(" dst: "); 588 atom_put_dst(ctx, arg, attr, &dptr, 0, saved); 589} 590 591static void atom_op_compare(atom_exec_context *ctx, int *ptr, int arg) 592{ 593 uint8_t attr = U8((*ptr)++); 594 uint32_t dst, src; 595 SDEBUG(" src1: "); 596 dst = atom_get_dst(ctx, arg, attr, ptr, NULL, 1); 597 SDEBUG(" src2: "); 598 src = atom_get_src(ctx, attr, ptr); 599 ctx->ctx->cs_equal = (dst == src); 600 ctx->ctx->cs_above = (dst > src); 601 SDEBUG(" result: %s %s\n", ctx->ctx->cs_equal ? "EQ" : "NE", 602 ctx->ctx->cs_above ? "GT" : "LE"); 603} 604 605static void atom_op_delay(atom_exec_context *ctx, int *ptr, int arg) 606{ 607 uint8_t count = U8((*ptr)++); 608 SDEBUG(" count: %d\n", count); 609 if (arg == ATOM_UNIT_MICROSEC) 610 schedule_timeout_uninterruptible(usecs_to_jiffies(count)); 611 else 612 schedule_timeout_uninterruptible(msecs_to_jiffies(count)); 613} 614 615static void atom_op_div(atom_exec_context *ctx, int *ptr, int arg) 616{ 617 uint8_t attr = U8((*ptr)++); 618 uint32_t dst, src; 619 SDEBUG(" src1: "); 620 dst = atom_get_dst(ctx, arg, attr, ptr, NULL, 1); 621 SDEBUG(" src2: "); 622 src = atom_get_src(ctx, attr, ptr); 623 if (src != 0) { 624 ctx->ctx->divmul[0] = dst / src; 625 ctx->ctx->divmul[1] = dst % src; 626 } else { 627 ctx->ctx->divmul[0] = 0; 628 ctx->ctx->divmul[1] = 0; 629 } 630} 631 632static void atom_op_eot(atom_exec_context *ctx, int *ptr, int arg) 633{ 634 /* functionally, a nop */ 635} 636 637static void atom_op_jump(atom_exec_context *ctx, int *ptr, int arg) 638{ 639 int execute = 0, target = U16(*ptr); 640 (*ptr) += 2; 641 switch (arg) { 642 case ATOM_COND_ABOVE: 643 execute = ctx->ctx->cs_above; 644 break; 645 case ATOM_COND_ABOVEOREQUAL: 646 execute = ctx->ctx->cs_above || ctx->ctx->cs_equal; 647 break; 648 case ATOM_COND_ALWAYS: 649 execute = 1; 650 break; 651 case ATOM_COND_BELOW: 652 execute = !(ctx->ctx->cs_above || ctx->ctx->cs_equal); 653 break; 654 case ATOM_COND_BELOWOREQUAL: 655 execute = !ctx->ctx->cs_above; 656 break; 657 case ATOM_COND_EQUAL: 658 execute = ctx->ctx->cs_equal; 659 break; 660 case ATOM_COND_NOTEQUAL: 661 execute = !ctx->ctx->cs_equal; 662 break; 663 } 664 if (arg != ATOM_COND_ALWAYS) 665 SDEBUG(" taken: %s\n", execute ? "yes" : "no"); 666 SDEBUG(" target: 0x%04X\n", target); 667 if (execute) 668 *ptr = ctx->start + target; 669} 670 671static void atom_op_mask(atom_exec_context *ctx, int *ptr, int arg) 672{ 673 uint8_t attr = U8((*ptr)++); 674 uint32_t dst, src1, src2, saved; 675 int dptr = *ptr; 676 SDEBUG(" dst: "); 677 dst = atom_get_dst(ctx, arg, attr, ptr, &saved, 1); 678 SDEBUG(" src1: "); 679 src1 = atom_get_src(ctx, attr, ptr); 680 SDEBUG(" src2: "); 681 src2 = atom_get_src(ctx, attr, ptr); 682 dst &= src1; 683 dst |= src2; 684 SDEBUG(" dst: "); 685 atom_put_dst(ctx, arg, attr, &dptr, dst, saved); 686} 687 688static void atom_op_move(atom_exec_context *ctx, int *ptr, int arg) 689{ 690 uint8_t attr = U8((*ptr)++); 691 uint32_t src, saved; 692 int dptr = *ptr; 693 if (((attr >> 3) & 7) != ATOM_SRC_DWORD) 694 atom_get_dst(ctx, arg, attr, ptr, &saved, 0); 695 else { 696 atom_skip_dst(ctx, arg, attr, ptr); 697 saved = 0xCDCDCDCD; 698 } 699 SDEBUG(" src: "); 700 src = atom_get_src(ctx, attr, ptr); 701 SDEBUG(" dst: "); 702 atom_put_dst(ctx, arg, attr, &dptr, src, saved); 703} 704 705static void atom_op_mul(atom_exec_context *ctx, int *ptr, int arg) 706{ 707 uint8_t attr = U8((*ptr)++); 708 uint32_t dst, src; 709 SDEBUG(" src1: "); 710 dst = atom_get_dst(ctx, arg, attr, ptr, NULL, 1); 711 SDEBUG(" src2: "); 712 src = atom_get_src(ctx, attr, ptr); 713 ctx->ctx->divmul[0] = dst * src; 714} 715 716static void atom_op_nop(atom_exec_context *ctx, int *ptr, int arg) 717{ 718 /* nothing */ 719} 720 721static void atom_op_or(atom_exec_context *ctx, int *ptr, int arg) 722{ 723 uint8_t attr = U8((*ptr)++); 724 uint32_t dst, src, saved; 725 int dptr = *ptr; 726 SDEBUG(" dst: "); 727 dst = atom_get_dst(ctx, arg, attr, ptr, &saved, 1); 728 SDEBUG(" src: "); 729 src = atom_get_src(ctx, attr, ptr); 730 dst |= src; 731 SDEBUG(" dst: "); 732 atom_put_dst(ctx, arg, attr, &dptr, dst, saved); 733} 734 735static void atom_op_postcard(atom_exec_context *ctx, int *ptr, int arg) 736{ 737 uint8_t val = U8((*ptr)++); 738 SDEBUG("POST card output: 0x%02X\n", val); 739} 740 741static void atom_op_repeat(atom_exec_context *ctx, int *ptr, int arg) 742{ 743 printk(KERN_INFO "unimplemented!\n"); 744} 745 746static void atom_op_restorereg(atom_exec_context *ctx, int *ptr, int arg) 747{ 748 printk(KERN_INFO "unimplemented!\n"); 749} 750 751static void atom_op_savereg(atom_exec_context *ctx, int *ptr, int arg) 752{ 753 printk(KERN_INFO "unimplemented!\n"); 754} 755 756static void atom_op_setdatablock(atom_exec_context *ctx, int *ptr, int arg) 757{ 758 int idx = U8(*ptr); 759 (*ptr)++; 760 SDEBUG(" block: %d\n", idx); 761 if (!idx) 762 ctx->ctx->data_block = 0; 763 else if (idx == 255) 764 ctx->ctx->data_block = ctx->start; 765 else 766 ctx->ctx->data_block = U16(ctx->ctx->data_table + 4 + 2 * idx); 767 SDEBUG(" base: 0x%04X\n", ctx->ctx->data_block); 768} 769 770static void atom_op_setfbbase(atom_exec_context *ctx, int *ptr, int arg) 771{ 772 uint8_t attr = U8((*ptr)++); 773 SDEBUG(" fb_base: "); 774 ctx->ctx->fb_base = atom_get_src(ctx, attr, ptr); 775} 776 777static void atom_op_setport(atom_exec_context *ctx, int *ptr, int arg) 778{ 779 int port; 780 switch (arg) { 781 case ATOM_PORT_ATI: 782 port = U16(*ptr); 783 if (port < ATOM_IO_NAMES_CNT) 784 SDEBUG(" port: %d (%s)\n", port, atom_io_names[port]); 785 else 786 SDEBUG(" port: %d\n", port); 787 if (!port) 788 ctx->ctx->io_mode = ATOM_IO_MM; 789 else 790 ctx->ctx->io_mode = ATOM_IO_IIO | port; 791 (*ptr) += 2; 792 break; 793 case ATOM_PORT_PCI: 794 ctx->ctx->io_mode = ATOM_IO_PCI; 795 (*ptr)++; 796 break; 797 case ATOM_PORT_SYSIO: 798 ctx->ctx->io_mode = ATOM_IO_SYSIO; 799 (*ptr)++; 800 break; 801 } 802} 803 804static void atom_op_setregblock(atom_exec_context *ctx, int *ptr, int arg) 805{ 806 ctx->ctx->reg_block = U16(*ptr); 807 (*ptr) += 2; 808 SDEBUG(" base: 0x%04X\n", ctx->ctx->reg_block); 809} 810 811static void atom_op_shl(atom_exec_context *ctx, int *ptr, int arg) 812{ 813 uint8_t attr = U8((*ptr)++), shift; 814 uint32_t saved, dst; 815 int dptr = *ptr; 816 attr &= 0x38; 817 attr |= atom_def_dst[attr >> 3] << 6; 818 SDEBUG(" dst: "); 819 dst = atom_get_dst(ctx, arg, attr, ptr, &saved, 1); 820 shift = U8((*ptr)++); 821 SDEBUG(" shift: %d\n", shift); 822 dst <<= shift; 823 SDEBUG(" dst: "); 824 atom_put_dst(ctx, arg, attr, &dptr, dst, saved); 825} 826 827static void atom_op_shr(atom_exec_context *ctx, int *ptr, int arg) 828{ 829 uint8_t attr = U8((*ptr)++), shift; 830 uint32_t saved, dst; 831 int dptr = *ptr; 832 attr &= 0x38; 833 attr |= atom_def_dst[attr >> 3] << 6; 834 SDEBUG(" dst: "); 835 dst = atom_get_dst(ctx, arg, attr, ptr, &saved, 1); 836 shift = U8((*ptr)++); 837 SDEBUG(" shift: %d\n", shift); 838 dst >>= shift; 839 SDEBUG(" dst: "); 840 atom_put_dst(ctx, arg, attr, &dptr, dst, saved); 841} 842 843static void atom_op_sub(atom_exec_context *ctx, int *ptr, int arg) 844{ 845 uint8_t attr = U8((*ptr)++); 846 uint32_t dst, src, saved; 847 int dptr = *ptr; 848 SDEBUG(" dst: "); 849 dst = atom_get_dst(ctx, arg, attr, ptr, &saved, 1); 850 SDEBUG(" src: "); 851 src = atom_get_src(ctx, attr, ptr); 852 dst -= src; 853 SDEBUG(" dst: "); 854 atom_put_dst(ctx, arg, attr, &dptr, dst, saved); 855} 856 857static void atom_op_switch(atom_exec_context *ctx, int *ptr, int arg) 858{ 859 uint8_t attr = U8((*ptr)++); 860 uint32_t src, val, target; 861 SDEBUG(" switch: "); 862 src = atom_get_src(ctx, attr, ptr); 863 while (U16(*ptr) != ATOM_CASE_END) 864 if (U8(*ptr) == ATOM_CASE_MAGIC) { 865 (*ptr)++; 866 SDEBUG(" case: "); 867 val = 868 atom_get_src(ctx, (attr & 0x38) | ATOM_ARG_IMM, 869 ptr); 870 target = U16(*ptr); 871 if (val == src) { 872 SDEBUG(" target: %04X\n", target); 873 *ptr = ctx->start + target; 874 return; 875 } 876 (*ptr) += 2; 877 } else { 878 printk(KERN_INFO "Bad case.\n"); 879 return; 880 } 881 (*ptr) += 2; 882} 883 884static void atom_op_test(atom_exec_context *ctx, int *ptr, int arg) 885{ 886 uint8_t attr = U8((*ptr)++); 887 uint32_t dst, src; 888 SDEBUG(" src1: "); 889 dst = atom_get_dst(ctx, arg, attr, ptr, NULL, 1); 890 SDEBUG(" src2: "); 891 src = atom_get_src(ctx, attr, ptr); 892 ctx->ctx->cs_equal = ((dst & src) == 0); 893 SDEBUG(" result: %s\n", ctx->ctx->cs_equal ? "EQ" : "NE"); 894} 895 896static void atom_op_xor(atom_exec_context *ctx, int *ptr, int arg) 897{ 898 uint8_t attr = U8((*ptr)++); 899 uint32_t dst, src, saved; 900 int dptr = *ptr; 901 SDEBUG(" dst: "); 902 dst = atom_get_dst(ctx, arg, attr, ptr, &saved, 1); 903 SDEBUG(" src: "); 904 src = atom_get_src(ctx, attr, ptr); 905 dst ^= src; 906 SDEBUG(" dst: "); 907 atom_put_dst(ctx, arg, attr, &dptr, dst, saved); 908} 909 910static void atom_op_debug(atom_exec_context *ctx, int *ptr, int arg) 911{ 912 printk(KERN_INFO "unimplemented!\n"); 913} 914 915static struct { 916 void (*func) (atom_exec_context *, int *, int); 917 int arg; 918} opcode_table[ATOM_OP_CNT] = { 919 { 920 NULL, 0}, { 921 atom_op_move, ATOM_ARG_REG}, { 922 atom_op_move, ATOM_ARG_PS}, { 923 atom_op_move, ATOM_ARG_WS}, { 924 atom_op_move, ATOM_ARG_FB}, { 925 atom_op_move, ATOM_ARG_PLL}, { 926 atom_op_move, ATOM_ARG_MC}, { 927 atom_op_and, ATOM_ARG_REG}, { 928 atom_op_and, ATOM_ARG_PS}, { 929 atom_op_and, ATOM_ARG_WS}, { 930 atom_op_and, ATOM_ARG_FB}, { 931 atom_op_and, ATOM_ARG_PLL}, { 932 atom_op_and, ATOM_ARG_MC}, { 933 atom_op_or, ATOM_ARG_REG}, { 934 atom_op_or, ATOM_ARG_PS}, { 935 atom_op_or, ATOM_ARG_WS}, { 936 atom_op_or, ATOM_ARG_FB}, { 937 atom_op_or, ATOM_ARG_PLL}, { 938 atom_op_or, ATOM_ARG_MC}, { 939 atom_op_shl, ATOM_ARG_REG}, { 940 atom_op_shl, ATOM_ARG_PS}, { 941 atom_op_shl, ATOM_ARG_WS}, { 942 atom_op_shl, ATOM_ARG_FB}, { 943 atom_op_shl, ATOM_ARG_PLL}, { 944 atom_op_shl, ATOM_ARG_MC}, { 945 atom_op_shr, ATOM_ARG_REG}, { 946 atom_op_shr, ATOM_ARG_PS}, { 947 atom_op_shr, ATOM_ARG_WS}, { 948 atom_op_shr, ATOM_ARG_FB}, { 949 atom_op_shr, ATOM_ARG_PLL}, { 950 atom_op_shr, ATOM_ARG_MC}, { 951 atom_op_mul, ATOM_ARG_REG}, { 952 atom_op_mul, ATOM_ARG_PS}, { 953 atom_op_mul, ATOM_ARG_WS}, { 954 atom_op_mul, ATOM_ARG_FB}, { 955 atom_op_mul, ATOM_ARG_PLL}, { 956 atom_op_mul, ATOM_ARG_MC}, { 957 atom_op_div, ATOM_ARG_REG}, { 958 atom_op_div, ATOM_ARG_PS}, { 959 atom_op_div, ATOM_ARG_WS}, { 960 atom_op_div, ATOM_ARG_FB}, { 961 atom_op_div, ATOM_ARG_PLL}, { 962 atom_op_div, ATOM_ARG_MC}, { 963 atom_op_add, ATOM_ARG_REG}, { 964 atom_op_add, ATOM_ARG_PS}, { 965 atom_op_add, ATOM_ARG_WS}, { 966 atom_op_add, ATOM_ARG_FB}, { 967 atom_op_add, ATOM_ARG_PLL}, { 968 atom_op_add, ATOM_ARG_MC}, { 969 atom_op_sub, ATOM_ARG_REG}, { 970 atom_op_sub, ATOM_ARG_PS}, { 971 atom_op_sub, ATOM_ARG_WS}, { 972 atom_op_sub, ATOM_ARG_FB}, { 973 atom_op_sub, ATOM_ARG_PLL}, { 974 atom_op_sub, ATOM_ARG_MC}, { 975 atom_op_setport, ATOM_PORT_ATI}, { 976 atom_op_setport, ATOM_PORT_PCI}, { 977 atom_op_setport, ATOM_PORT_SYSIO}, { 978 atom_op_setregblock, 0}, { 979 atom_op_setfbbase, 0}, { 980 atom_op_compare, ATOM_ARG_REG}, { 981 atom_op_compare, ATOM_ARG_PS}, { 982 atom_op_compare, ATOM_ARG_WS}, { 983 atom_op_compare, ATOM_ARG_FB}, { 984 atom_op_compare, ATOM_ARG_PLL}, { 985 atom_op_compare, ATOM_ARG_MC}, { 986 atom_op_switch, 0}, { 987 atom_op_jump, ATOM_COND_ALWAYS}, { 988 atom_op_jump, ATOM_COND_EQUAL}, { 989 atom_op_jump, ATOM_COND_BELOW}, { 990 atom_op_jump, ATOM_COND_ABOVE}, { 991 atom_op_jump, ATOM_COND_BELOWOREQUAL}, { 992 atom_op_jump, ATOM_COND_ABOVEOREQUAL}, { 993 atom_op_jump, ATOM_COND_NOTEQUAL}, { 994 atom_op_test, ATOM_ARG_REG}, { 995 atom_op_test, ATOM_ARG_PS}, { 996 atom_op_test, ATOM_ARG_WS}, { 997 atom_op_test, ATOM_ARG_FB}, { 998 atom_op_test, ATOM_ARG_PLL}, { 999 atom_op_test, ATOM_ARG_MC}, { 1000 atom_op_delay, ATOM_UNIT_MILLISEC}, { 1001 atom_op_delay, ATOM_UNIT_MICROSEC}, { 1002 atom_op_calltable, 0}, { 1003 atom_op_repeat, 0}, { 1004 atom_op_clear, ATOM_ARG_REG}, { 1005 atom_op_clear, ATOM_ARG_PS}, { 1006 atom_op_clear, ATOM_ARG_WS}, { 1007 atom_op_clear, ATOM_ARG_FB}, { 1008 atom_op_clear, ATOM_ARG_PLL}, { 1009 atom_op_clear, ATOM_ARG_MC}, { 1010 atom_op_nop, 0}, { 1011 atom_op_eot, 0}, { 1012 atom_op_mask, ATOM_ARG_REG}, { 1013 atom_op_mask, ATOM_ARG_PS}, { 1014 atom_op_mask, ATOM_ARG_WS}, { 1015 atom_op_mask, ATOM_ARG_FB}, { 1016 atom_op_mask, ATOM_ARG_PLL}, { 1017 atom_op_mask, ATOM_ARG_MC}, { 1018 atom_op_postcard, 0}, { 1019 atom_op_beep, 0}, { 1020 atom_op_savereg, 0}, { 1021 atom_op_restorereg, 0}, { 1022 atom_op_setdatablock, 0}, { 1023 atom_op_xor, ATOM_ARG_REG}, { 1024 atom_op_xor, ATOM_ARG_PS}, { 1025 atom_op_xor, ATOM_ARG_WS}, { 1026 atom_op_xor, ATOM_ARG_FB}, { 1027 atom_op_xor, ATOM_ARG_PLL}, { 1028 atom_op_xor, ATOM_ARG_MC}, { 1029 atom_op_shl, ATOM_ARG_REG}, { 1030 atom_op_shl, ATOM_ARG_PS}, { 1031 atom_op_shl, ATOM_ARG_WS}, { 1032 atom_op_shl, ATOM_ARG_FB}, { 1033 atom_op_shl, ATOM_ARG_PLL}, { 1034 atom_op_shl, ATOM_ARG_MC}, { 1035 atom_op_shr, ATOM_ARG_REG}, { 1036 atom_op_shr, ATOM_ARG_PS}, { 1037 atom_op_shr, ATOM_ARG_WS}, { 1038 atom_op_shr, ATOM_ARG_FB}, { 1039 atom_op_shr, ATOM_ARG_PLL}, { 1040 atom_op_shr, ATOM_ARG_MC}, { 1041atom_op_debug, 0},}; 1042 1043void atom_execute_table(struct atom_context *ctx, int index, uint32_t * params) 1044{ 1045 int base = CU16(ctx->cmd_table + 4 + 2 * index); 1046 int len, ws, ps, ptr; 1047 unsigned char op; 1048 atom_exec_context ectx; 1049 1050 if (!base) 1051 return; 1052 1053 len = CU16(base + ATOM_CT_SIZE_PTR); 1054 ws = CU8(base + ATOM_CT_WS_PTR); 1055 ps = CU8(base + ATOM_CT_PS_PTR) & ATOM_CT_PS_MASK; 1056 ptr = base + ATOM_CT_CODE_PTR; 1057 1058 SDEBUG(">> execute %04X (len %d, WS %d, PS %d)\n", base, len, ws, ps); 1059 1060 /* reset reg block */ 1061 ctx->reg_block = 0; 1062 ectx.ctx = ctx; 1063 ectx.ps_shift = ps / 4; 1064 ectx.start = base; 1065 ectx.ps = params; 1066 if (ws) 1067 ectx.ws = kzalloc(4 * ws, GFP_KERNEL); 1068 else 1069 ectx.ws = NULL; 1070 1071 debug_depth++; 1072 while (1) { 1073 op = CU8(ptr++); 1074 if (op < ATOM_OP_NAMES_CNT) 1075 SDEBUG("%s @ 0x%04X\n", atom_op_names[op], ptr - 1); 1076 else 1077 SDEBUG("[%d] @ 0x%04X\n", op, ptr - 1); 1078 1079 if (op < ATOM_OP_CNT && op > 0) 1080 opcode_table[op].func(&ectx, &ptr, 1081 opcode_table[op].arg); 1082 else 1083 break; 1084 1085 if (op == ATOM_OP_EOT) 1086 break; 1087 } 1088 debug_depth--; 1089 SDEBUG("<<\n"); 1090 1091 if (ws) 1092 kfree(ectx.ws); 1093} 1094 1095static int atom_iio_len[] = { 1, 2, 3, 3, 3, 3, 4, 4, 4, 3 }; 1096 1097static void atom_index_iio(struct atom_context *ctx, int base) 1098{ 1099 ctx->iio = kzalloc(2 * 256, GFP_KERNEL); 1100 while (CU8(base) == ATOM_IIO_START) { 1101 ctx->iio[CU8(base + 1)] = base + 2; 1102 base += 2; 1103 while (CU8(base) != ATOM_IIO_END) 1104 base += atom_iio_len[CU8(base)]; 1105 base += 3; 1106 } 1107} 1108 1109struct atom_context *atom_parse(struct card_info *card, void *bios) 1110{ 1111 int base; 1112 struct atom_context *ctx = 1113 kzalloc(sizeof(struct atom_context), GFP_KERNEL); 1114 char *str; 1115 char name[512]; 1116 int i; 1117 1118 ctx->card = card; 1119 ctx->bios = bios; 1120 1121 if (CU16(0) != ATOM_BIOS_MAGIC) { 1122 printk(KERN_INFO "Invalid BIOS magic.\n"); 1123 kfree(ctx); 1124 return NULL; 1125 } 1126 if (strncmp 1127 (CSTR(ATOM_ATI_MAGIC_PTR), ATOM_ATI_MAGIC, 1128 strlen(ATOM_ATI_MAGIC))) { 1129 printk(KERN_INFO "Invalid ATI magic.\n"); 1130 kfree(ctx); 1131 return NULL; 1132 } 1133 1134 base = CU16(ATOM_ROM_TABLE_PTR); 1135 if (strncmp 1136 (CSTR(base + ATOM_ROM_MAGIC_PTR), ATOM_ROM_MAGIC, 1137 strlen(ATOM_ROM_MAGIC))) { 1138 printk(KERN_INFO "Invalid ATOM magic.\n"); 1139 kfree(ctx); 1140 return NULL; 1141 } 1142 1143 ctx->cmd_table = CU16(base + ATOM_ROM_CMD_PTR); 1144 ctx->data_table = CU16(base + ATOM_ROM_DATA_PTR); 1145 atom_index_iio(ctx, CU16(ctx->data_table + ATOM_DATA_IIO_PTR) + 4); 1146 1147 str = CSTR(CU16(base + ATOM_ROM_MSG_PTR)); 1148 while (*str && ((*str == '\n') || (*str == '\r'))) 1149 str++; 1150 /* name string isn't always 0 terminated */ 1151 for (i = 0; i < 511; i++) { 1152 name[i] = str[i]; 1153 if (name[i] < '.' || name[i] > 'z') { 1154 name[i] = 0; 1155 break; 1156 } 1157 } 1158 printk(KERN_INFO "ATOM BIOS: %s\n", name); 1159 1160 return ctx; 1161} 1162 1163int atom_asic_init(struct atom_context *ctx) 1164{ 1165 int hwi = CU16(ctx->data_table + ATOM_DATA_FWI_PTR); 1166 uint32_t ps[16]; 1167 memset(ps, 0, 64); 1168 1169 ps[0] = cpu_to_le32(CU32(hwi + ATOM_FWI_DEFSCLK_PTR)); 1170 ps[1] = cpu_to_le32(CU32(hwi + ATOM_FWI_DEFMCLK_PTR)); 1171 if (!ps[0] || !ps[1]) 1172 return 1; 1173 1174 if (!CU16(ctx->cmd_table + 4 + 2 * ATOM_CMD_INIT)) 1175 return 1; 1176 atom_execute_table(ctx, ATOM_CMD_INIT, ps); 1177 1178 return 0; 1179} 1180 1181void atom_destroy(struct atom_context *ctx) 1182{ 1183 if (ctx->iio) 1184 kfree(ctx->iio); 1185 kfree(ctx); 1186} 1187 1188void atom_parse_data_header(struct atom_context *ctx, int index, 1189 uint16_t * size, uint8_t * frev, uint8_t * crev, 1190 uint16_t * data_start) 1191{ 1192 int offset = index * 2 + 4; 1193 int idx = CU16(ctx->data_table + offset); 1194 1195 if (size) 1196 *size = CU16(idx); 1197 if (frev) 1198 *frev = CU8(idx + 2); 1199 if (crev) 1200 *crev = CU8(idx + 3); 1201 *data_start = idx; 1202 return; 1203} 1204 1205void atom_parse_cmd_header(struct atom_context *ctx, int index, uint8_t * frev, 1206 uint8_t * crev) 1207{ 1208 int offset = index * 2 + 4; 1209 int idx = CU16(ctx->cmd_table + offset); 1210 1211 if (frev) 1212 *frev = CU8(idx + 2); 1213 if (crev) 1214 *crev = CU8(idx + 3); 1215 return; 1216} 1217 1218int atom_allocate_fb_scratch(struct atom_context *ctx) 1219{ 1220 int index = GetIndexIntoMasterTable(DATA, VRAM_UsageByFirmware); 1221 uint16_t data_offset; 1222 int usage_bytes; 1223 struct _ATOM_VRAM_USAGE_BY_FIRMWARE *firmware_usage; 1224 1225 atom_parse_data_header(ctx, index, NULL, NULL, NULL, &data_offset); 1226 1227 firmware_usage = (struct _ATOM_VRAM_USAGE_BY_FIRMWARE *)(ctx->bios + data_offset); 1228 1229 DRM_DEBUG("atom firmware requested %08x %dkb\n", 1230 firmware_usage->asFirmwareVramReserveInfo[0].ulStartAddrUsedByFirmware, 1231 firmware_usage->asFirmwareVramReserveInfo[0].usFirmwareUseInKb); 1232 1233 usage_bytes = firmware_usage->asFirmwareVramReserveInfo[0].usFirmwareUseInKb * 1024; 1234 if (usage_bytes == 0) 1235 usage_bytes = 20 * 1024; 1236 /* allocate some scratch memory */ 1237 ctx->scratch = kzalloc(usage_bytes, GFP_KERNEL); 1238 if (!ctx->scratch) 1239 return -ENOMEM; 1240 return 0; 1241} 1242