1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * HD-audio controller helpers 4 */ 5 6 #include <linux/kernel.h> 7 #include <linux/delay.h> 8 #include <linux/export.h> 9 #include <sound/core.h> 10 #include <sound/hdaudio.h> 11 #include <sound/hda_register.h> 12 #include "local.h" 13 14 /* clear CORB read pointer properly */ 15 static void azx_clear_corbrp(struct hdac_bus *bus) 16 { 17 int timeout; 18 19 for (timeout = 1000; timeout > 0; timeout--) { 20 if (snd_hdac_chip_readw(bus, CORBRP) & AZX_CORBRP_RST) 21 break; 22 udelay(1); 23 } 24 if (timeout <= 0) 25 dev_err(bus->dev, "CORB reset timeout#1, CORBRP = %d\n", 26 snd_hdac_chip_readw(bus, CORBRP)); 27 28 snd_hdac_chip_writew(bus, CORBRP, 0); 29 for (timeout = 1000; timeout > 0; timeout--) { 30 if (snd_hdac_chip_readw(bus, CORBRP) == 0) 31 break; 32 udelay(1); 33 } 34 if (timeout <= 0) 35 dev_err(bus->dev, "CORB reset timeout#2, CORBRP = %d\n", 36 snd_hdac_chip_readw(bus, CORBRP)); 37 } 38 39 /** 40 * snd_hdac_bus_init_cmd_io - set up CORB/RIRB buffers 41 * @bus: HD-audio core bus 42 */ 43 void snd_hdac_bus_init_cmd_io(struct hdac_bus *bus) 44 { 45 WARN_ON_ONCE(!bus->rb.area); 46 47 spin_lock_irq(&bus->reg_lock); 48 /* CORB set up */ 49 bus->corb.addr = bus->rb.addr; 50 bus->corb.buf = (__le32 *)bus->rb.area; 51 snd_hdac_chip_writel(bus, CORBLBASE, (u32)bus->corb.addr); 52 snd_hdac_chip_writel(bus, CORBUBASE, upper_32_bits(bus->corb.addr)); 53 54 /* set the corb size to 256 entries (ULI requires explicitly) */ 55 snd_hdac_chip_writeb(bus, CORBSIZE, 0x02); 56 /* set the corb write pointer to 0 */ 57 snd_hdac_chip_writew(bus, CORBWP, 0); 58 59 /* reset the corb hw read pointer */ 60 snd_hdac_chip_writew(bus, CORBRP, AZX_CORBRP_RST); 61 if (!bus->corbrp_self_clear) 62 azx_clear_corbrp(bus); 63 64 /* enable corb dma */ 65 snd_hdac_chip_writeb(bus, CORBCTL, AZX_CORBCTL_RUN); 66 67 /* RIRB set up */ 68 bus->rirb.addr = bus->rb.addr + 2048; 69 bus->rirb.buf = (__le32 *)(bus->rb.area + 2048); 70 bus->rirb.wp = bus->rirb.rp = 0; 71 memset(bus->rirb.cmds, 0, sizeof(bus->rirb.cmds)); 72 snd_hdac_chip_writel(bus, RIRBLBASE, (u32)bus->rirb.addr); 73 snd_hdac_chip_writel(bus, RIRBUBASE, upper_32_bits(bus->rirb.addr)); 74 75 /* set the rirb size to 256 entries (ULI requires explicitly) */ 76 snd_hdac_chip_writeb(bus, RIRBSIZE, 0x02); 77 /* reset the rirb hw write pointer */ 78 snd_hdac_chip_writew(bus, RIRBWP, AZX_RIRBWP_RST); 79 /* set N=1, get RIRB response interrupt for new entry */ 80 snd_hdac_chip_writew(bus, RINTCNT, 1); 81 /* enable rirb dma and response irq */ 82 snd_hdac_chip_writeb(bus, RIRBCTL, AZX_RBCTL_DMA_EN | AZX_RBCTL_IRQ_EN); 83 /* Accept unsolicited responses */ 84 snd_hdac_chip_updatel(bus, GCTL, AZX_GCTL_UNSOL, AZX_GCTL_UNSOL); 85 spin_unlock_irq(&bus->reg_lock); 86 } 87 EXPORT_SYMBOL_GPL(snd_hdac_bus_init_cmd_io); 88 89 /* wait for cmd dmas till they are stopped */ 90 static void hdac_wait_for_cmd_dmas(struct hdac_bus *bus) 91 { 92 unsigned long timeout; 93 94 timeout = jiffies + msecs_to_jiffies(100); 95 while ((snd_hdac_chip_readb(bus, RIRBCTL) & AZX_RBCTL_DMA_EN) 96 && time_before(jiffies, timeout)) 97 udelay(10); 98 99 timeout = jiffies + msecs_to_jiffies(100); 100 while ((snd_hdac_chip_readb(bus, CORBCTL) & AZX_CORBCTL_RUN) 101 && time_before(jiffies, timeout)) 102 udelay(10); 103 } 104 105 /** 106 * snd_hdac_bus_stop_cmd_io - clean up CORB/RIRB buffers 107 * @bus: HD-audio core bus 108 */ 109 void snd_hdac_bus_stop_cmd_io(struct hdac_bus *bus) 110 { 111 spin_lock_irq(&bus->reg_lock); 112 /* disable ringbuffer DMAs */ 113 snd_hdac_chip_writeb(bus, RIRBCTL, 0); 114 snd_hdac_chip_writeb(bus, CORBCTL, 0); 115 spin_unlock_irq(&bus->reg_lock); 116 117 hdac_wait_for_cmd_dmas(bus); 118 119 spin_lock_irq(&bus->reg_lock); 120 /* disable unsolicited responses */ 121 snd_hdac_chip_updatel(bus, GCTL, AZX_GCTL_UNSOL, 0); 122 spin_unlock_irq(&bus->reg_lock); 123 } 124 EXPORT_SYMBOL_GPL(snd_hdac_bus_stop_cmd_io); 125 126 static unsigned int azx_command_addr(u32 cmd) 127 { 128 unsigned int addr = cmd >> 28; 129 130 if (snd_BUG_ON(addr >= HDA_MAX_CODECS)) 131 addr = 0; 132 return addr; 133 } 134 135 /** 136 * snd_hdac_bus_send_cmd - send a command verb via CORB 137 * @bus: HD-audio core bus 138 * @val: encoded verb value to send 139 * 140 * Returns zero for success or a negative error code. 141 */ 142 int snd_hdac_bus_send_cmd(struct hdac_bus *bus, unsigned int val) 143 { 144 unsigned int addr = azx_command_addr(val); 145 unsigned int wp, rp; 146 147 spin_lock_irq(&bus->reg_lock); 148 149 bus->last_cmd[azx_command_addr(val)] = val; 150 151 /* add command to corb */ 152 wp = snd_hdac_chip_readw(bus, CORBWP); 153 if (wp == 0xffff) { 154 /* something wrong, controller likely turned to D3 */ 155 spin_unlock_irq(&bus->reg_lock); 156 return -EIO; 157 } 158 wp++; 159 wp %= AZX_MAX_CORB_ENTRIES; 160 161 rp = snd_hdac_chip_readw(bus, CORBRP); 162 if (wp == rp) { 163 /* oops, it's full */ 164 spin_unlock_irq(&bus->reg_lock); 165 return -EAGAIN; 166 } 167 168 bus->rirb.cmds[addr]++; 169 bus->corb.buf[wp] = cpu_to_le32(val); 170 snd_hdac_chip_writew(bus, CORBWP, wp); 171 172 spin_unlock_irq(&bus->reg_lock); 173 174 return 0; 175 } 176 EXPORT_SYMBOL_GPL(snd_hdac_bus_send_cmd); 177 178 #define AZX_RIRB_EX_UNSOL_EV (1<<4) 179 180 /** 181 * snd_hdac_bus_update_rirb - retrieve RIRB entries 182 * @bus: HD-audio core bus 183 * 184 * Usually called from interrupt handler. 185 * The caller needs bus->reg_lock spinlock before calling this. 186 */ 187 void snd_hdac_bus_update_rirb(struct hdac_bus *bus) 188 { 189 unsigned int rp, wp; 190 unsigned int addr; 191 u32 res, res_ex; 192 193 wp = snd_hdac_chip_readw(bus, RIRBWP); 194 if (wp == 0xffff) { 195 /* something wrong, controller likely turned to D3 */ 196 return; 197 } 198 199 if (wp == bus->rirb.wp) 200 return; 201 bus->rirb.wp = wp; 202 203 while (bus->rirb.rp != wp) { 204 bus->rirb.rp++; 205 bus->rirb.rp %= AZX_MAX_RIRB_ENTRIES; 206 207 rp = bus->rirb.rp << 1; /* an RIRB entry is 8-bytes */ 208 res_ex = le32_to_cpu(bus->rirb.buf[rp + 1]); 209 res = le32_to_cpu(bus->rirb.buf[rp]); 210 addr = res_ex & 0xf; 211 if (addr >= HDA_MAX_CODECS) { 212 dev_err(bus->dev, 213 "spurious response %#x:%#x, rp = %d, wp = %d", 214 res, res_ex, bus->rirb.rp, wp); 215 snd_BUG(); 216 } else if (res_ex & AZX_RIRB_EX_UNSOL_EV) 217 snd_hdac_bus_queue_event(bus, res, res_ex); 218 else if (bus->rirb.cmds[addr]) { 219 bus->rirb.res[addr] = res; 220 bus->rirb.cmds[addr]--; 221 if (!bus->rirb.cmds[addr] && 222 waitqueue_active(&bus->rirb_wq)) 223 wake_up(&bus->rirb_wq); 224 } else { 225 dev_err_ratelimited(bus->dev, 226 "spurious response %#x:%#x, last cmd=%#08x\n", 227 res, res_ex, bus->last_cmd[addr]); 228 } 229 } 230 } 231 EXPORT_SYMBOL_GPL(snd_hdac_bus_update_rirb); 232 233 /** 234 * snd_hdac_bus_get_response - receive a response via RIRB 235 * @bus: HD-audio core bus 236 * @addr: codec address 237 * @res: pointer to store the value, NULL when not needed 238 * 239 * Returns zero if a value is read, or a negative error code. 240 */ 241 int snd_hdac_bus_get_response(struct hdac_bus *bus, unsigned int addr, 242 unsigned int *res) 243 { 244 unsigned long timeout; 245 unsigned long loopcounter; 246 wait_queue_entry_t wait; 247 bool warned = false; 248 249 init_wait_entry(&wait, 0); 250 timeout = jiffies + msecs_to_jiffies(1000); 251 252 for (loopcounter = 0;; loopcounter++) { 253 spin_lock_irq(&bus->reg_lock); 254 if (!bus->polling_mode) 255 prepare_to_wait(&bus->rirb_wq, &wait, 256 TASK_UNINTERRUPTIBLE); 257 if (bus->polling_mode) 258 snd_hdac_bus_update_rirb(bus); 259 if (!bus->rirb.cmds[addr]) { 260 if (res) 261 *res = bus->rirb.res[addr]; /* the last value */ 262 if (!bus->polling_mode) 263 finish_wait(&bus->rirb_wq, &wait); 264 spin_unlock_irq(&bus->reg_lock); 265 return 0; 266 } 267 spin_unlock_irq(&bus->reg_lock); 268 if (time_after(jiffies, timeout)) 269 break; 270 #define LOOP_COUNT_MAX 3000 271 if (!bus->polling_mode) { 272 schedule_timeout(msecs_to_jiffies(2)); 273 } else if (bus->needs_damn_long_delay || 274 loopcounter > LOOP_COUNT_MAX) { 275 if (loopcounter > LOOP_COUNT_MAX && !warned) { 276 dev_dbg_ratelimited(bus->dev, 277 "too slow response, last cmd=%#08x\n", 278 bus->last_cmd[addr]); 279 warned = true; 280 } 281 msleep(2); /* temporary workaround */ 282 } else { 283 udelay(10); 284 cond_resched(); 285 } 286 } 287 288 if (!bus->polling_mode) 289 finish_wait(&bus->rirb_wq, &wait); 290 291 return -EIO; 292 } 293 EXPORT_SYMBOL_GPL(snd_hdac_bus_get_response); 294 295 #define HDAC_MAX_CAPS 10 296 /** 297 * snd_hdac_bus_parse_capabilities - parse capability structure 298 * @bus: the pointer to bus object 299 * 300 * Returns 0 if successful, or a negative error code. 301 */ 302 int snd_hdac_bus_parse_capabilities(struct hdac_bus *bus) 303 { 304 unsigned int cur_cap; 305 unsigned int offset; 306 unsigned int counter = 0; 307 308 offset = snd_hdac_chip_readw(bus, LLCH); 309 310 /* Lets walk the linked capabilities list */ 311 do { 312 cur_cap = _snd_hdac_chip_readl(bus, offset); 313 314 dev_dbg(bus->dev, "Capability version: 0x%x\n", 315 (cur_cap & AZX_CAP_HDR_VER_MASK) >> AZX_CAP_HDR_VER_OFF); 316 317 dev_dbg(bus->dev, "HDA capability ID: 0x%x\n", 318 (cur_cap & AZX_CAP_HDR_ID_MASK) >> AZX_CAP_HDR_ID_OFF); 319 320 if (cur_cap == -1) { 321 dev_dbg(bus->dev, "Invalid capability reg read\n"); 322 break; 323 } 324 325 switch ((cur_cap & AZX_CAP_HDR_ID_MASK) >> AZX_CAP_HDR_ID_OFF) { 326 case AZX_ML_CAP_ID: 327 dev_dbg(bus->dev, "Found ML capability\n"); 328 bus->mlcap = bus->remap_addr + offset; 329 break; 330 331 case AZX_GTS_CAP_ID: 332 dev_dbg(bus->dev, "Found GTS capability offset=%x\n", offset); 333 bus->gtscap = bus->remap_addr + offset; 334 break; 335 336 case AZX_PP_CAP_ID: 337 /* PP capability found, the Audio DSP is present */ 338 dev_dbg(bus->dev, "Found PP capability offset=%x\n", offset); 339 bus->ppcap = bus->remap_addr + offset; 340 break; 341 342 case AZX_SPB_CAP_ID: 343 /* SPIB capability found, handler function */ 344 dev_dbg(bus->dev, "Found SPB capability\n"); 345 bus->spbcap = bus->remap_addr + offset; 346 break; 347 348 case AZX_DRSM_CAP_ID: 349 /* DMA resume capability found, handler function */ 350 dev_dbg(bus->dev, "Found DRSM capability\n"); 351 bus->drsmcap = bus->remap_addr + offset; 352 break; 353 354 default: 355 dev_err(bus->dev, "Unknown capability %d\n", cur_cap); 356 cur_cap = 0; 357 break; 358 } 359 360 counter++; 361 362 if (counter > HDAC_MAX_CAPS) { 363 dev_err(bus->dev, "We exceeded HDAC capabilities!!!\n"); 364 break; 365 } 366 367 /* read the offset of next capability */ 368 offset = cur_cap & AZX_CAP_HDR_NXT_PTR_MASK; 369 370 } while (offset); 371 372 return 0; 373 } 374 EXPORT_SYMBOL_GPL(snd_hdac_bus_parse_capabilities); 375 376 /* 377 * Lowlevel interface 378 */ 379 380 /** 381 * snd_hdac_bus_enter_link_reset - enter link reset 382 * @bus: HD-audio core bus 383 * 384 * Enter to the link reset state. 385 */ 386 void snd_hdac_bus_enter_link_reset(struct hdac_bus *bus) 387 { 388 unsigned long timeout; 389 390 /* reset controller */ 391 snd_hdac_chip_updatel(bus, GCTL, AZX_GCTL_RESET, 0); 392 393 timeout = jiffies + msecs_to_jiffies(100); 394 while ((snd_hdac_chip_readb(bus, GCTL) & AZX_GCTL_RESET) && 395 time_before(jiffies, timeout)) 396 usleep_range(500, 1000); 397 } 398 EXPORT_SYMBOL_GPL(snd_hdac_bus_enter_link_reset); 399 400 /** 401 * snd_hdac_bus_exit_link_reset - exit link reset 402 * @bus: HD-audio core bus 403 * 404 * Exit from the link reset state. 405 */ 406 void snd_hdac_bus_exit_link_reset(struct hdac_bus *bus) 407 { 408 unsigned long timeout; 409 410 snd_hdac_chip_updateb(bus, GCTL, AZX_GCTL_RESET, AZX_GCTL_RESET); 411 412 timeout = jiffies + msecs_to_jiffies(100); 413 while (!snd_hdac_chip_readb(bus, GCTL) && time_before(jiffies, timeout)) 414 usleep_range(500, 1000); 415 } 416 EXPORT_SYMBOL_GPL(snd_hdac_bus_exit_link_reset); 417 418 /* reset codec link */ 419 int snd_hdac_bus_reset_link(struct hdac_bus *bus, bool full_reset) 420 { 421 if (!full_reset) 422 goto skip_reset; 423 424 /* clear STATESTS */ 425 snd_hdac_chip_writew(bus, STATESTS, STATESTS_INT_MASK); 426 427 /* reset controller */ 428 snd_hdac_bus_enter_link_reset(bus); 429 430 /* delay for >= 100us for codec PLL to settle per spec 431 * Rev 0.9 section 5.5.1 432 */ 433 usleep_range(500, 1000); 434 435 /* Bring controller out of reset */ 436 snd_hdac_bus_exit_link_reset(bus); 437 438 /* Brent Chartrand said to wait >= 540us for codecs to initialize */ 439 usleep_range(1000, 1200); 440 441 skip_reset: 442 /* check to see if controller is ready */ 443 if (!snd_hdac_chip_readb(bus, GCTL)) { 444 dev_dbg(bus->dev, "controller not ready!\n"); 445 return -EBUSY; 446 } 447 448 /* detect codecs */ 449 if (!bus->codec_mask) { 450 bus->codec_mask = snd_hdac_chip_readw(bus, STATESTS); 451 dev_dbg(bus->dev, "codec_mask = 0x%lx\n", bus->codec_mask); 452 } 453 454 return 0; 455 } 456 EXPORT_SYMBOL_GPL(snd_hdac_bus_reset_link); 457 458 /* enable interrupts */ 459 static void azx_int_enable(struct hdac_bus *bus) 460 { 461 /* enable controller CIE and GIE */ 462 snd_hdac_chip_updatel(bus, INTCTL, 463 AZX_INT_CTRL_EN | AZX_INT_GLOBAL_EN, 464 AZX_INT_CTRL_EN | AZX_INT_GLOBAL_EN); 465 } 466 467 /* disable interrupts */ 468 static void azx_int_disable(struct hdac_bus *bus) 469 { 470 struct hdac_stream *azx_dev; 471 472 /* disable interrupts in stream descriptor */ 473 list_for_each_entry(azx_dev, &bus->stream_list, list) 474 snd_hdac_stream_updateb(azx_dev, SD_CTL, SD_INT_MASK, 0); 475 476 /* disable SIE for all streams */ 477 snd_hdac_chip_writeb(bus, INTCTL, 0); 478 479 /* disable controller CIE and GIE */ 480 snd_hdac_chip_updatel(bus, INTCTL, AZX_INT_CTRL_EN | AZX_INT_GLOBAL_EN, 0); 481 } 482 483 /* clear interrupts */ 484 static void azx_int_clear(struct hdac_bus *bus) 485 { 486 struct hdac_stream *azx_dev; 487 488 /* clear stream status */ 489 list_for_each_entry(azx_dev, &bus->stream_list, list) 490 snd_hdac_stream_writeb(azx_dev, SD_STS, SD_INT_MASK); 491 492 /* clear STATESTS */ 493 snd_hdac_chip_writew(bus, STATESTS, STATESTS_INT_MASK); 494 495 /* clear rirb status */ 496 snd_hdac_chip_writeb(bus, RIRBSTS, RIRB_INT_MASK); 497 498 /* clear int status */ 499 snd_hdac_chip_writel(bus, INTSTS, AZX_INT_CTRL_EN | AZX_INT_ALL_STREAM); 500 } 501 502 /** 503 * snd_hdac_bus_init_chip - reset and start the controller registers 504 * @bus: HD-audio core bus 505 * @full_reset: Do full reset 506 */ 507 bool snd_hdac_bus_init_chip(struct hdac_bus *bus, bool full_reset) 508 { 509 if (bus->chip_init) 510 return false; 511 512 /* reset controller */ 513 snd_hdac_bus_reset_link(bus, full_reset); 514 515 /* clear interrupts */ 516 azx_int_clear(bus); 517 518 /* initialize the codec command I/O */ 519 snd_hdac_bus_init_cmd_io(bus); 520 521 /* enable interrupts after CORB/RIRB buffers are initialized above */ 522 azx_int_enable(bus); 523 524 /* program the position buffer */ 525 if (bus->use_posbuf && bus->posbuf.addr) { 526 snd_hdac_chip_writel(bus, DPLBASE, (u32)bus->posbuf.addr); 527 snd_hdac_chip_writel(bus, DPUBASE, upper_32_bits(bus->posbuf.addr)); 528 } 529 530 bus->chip_init = true; 531 532 /* 533 * Default value of '8' is as per the HD audio specification (Rev 1.0a). 534 * Following relation is used to derive STRIPE control value. 535 * For sample rate <= 48K: 536 * { ((num_channels * bits_per_sample) / number of SDOs) >= 8 } 537 * For sample rate > 48K: 538 * { ((num_channels * bits_per_sample * rate/48000) / 539 * number of SDOs) >= 8 } 540 */ 541 bus->sdo_limit = 8; 542 543 return true; 544 } 545 EXPORT_SYMBOL_GPL(snd_hdac_bus_init_chip); 546 547 /** 548 * snd_hdac_bus_stop_chip - disable the whole IRQ and I/Os 549 * @bus: HD-audio core bus 550 */ 551 void snd_hdac_bus_stop_chip(struct hdac_bus *bus) 552 { 553 if (!bus->chip_init) 554 return; 555 556 /* disable interrupts */ 557 azx_int_disable(bus); 558 azx_int_clear(bus); 559 560 /* disable CORB/RIRB */ 561 snd_hdac_bus_stop_cmd_io(bus); 562 563 /* disable position buffer */ 564 if (bus->posbuf.addr) { 565 snd_hdac_chip_writel(bus, DPLBASE, 0); 566 snd_hdac_chip_writel(bus, DPUBASE, 0); 567 } 568 569 bus->chip_init = false; 570 } 571 EXPORT_SYMBOL_GPL(snd_hdac_bus_stop_chip); 572 573 /** 574 * snd_hdac_bus_handle_stream_irq - interrupt handler for streams 575 * @bus: HD-audio core bus 576 * @status: INTSTS register value 577 * @ack: callback to be called for woken streams 578 * 579 * Returns the bits of handled streams, or zero if no stream is handled. 580 */ 581 int snd_hdac_bus_handle_stream_irq(struct hdac_bus *bus, unsigned int status, 582 void (*ack)(struct hdac_bus *, 583 struct hdac_stream *)) 584 { 585 struct hdac_stream *azx_dev; 586 u8 sd_status; 587 int handled = 0; 588 589 list_for_each_entry(azx_dev, &bus->stream_list, list) { 590 if (status & azx_dev->sd_int_sta_mask) { 591 sd_status = snd_hdac_stream_readb(azx_dev, SD_STS); 592 snd_hdac_stream_writeb(azx_dev, SD_STS, SD_INT_MASK); 593 handled |= 1 << azx_dev->index; 594 if (!azx_dev->substream || !azx_dev->running || 595 !(sd_status & SD_INT_COMPLETE)) 596 continue; 597 if (ack) 598 ack(bus, azx_dev); 599 } 600 } 601 return handled; 602 } 603 EXPORT_SYMBOL_GPL(snd_hdac_bus_handle_stream_irq); 604 605 /** 606 * snd_hdac_bus_alloc_stream_pages - allocate BDL and other buffers 607 * @bus: HD-audio core bus 608 * 609 * Call this after assigning the all streams. 610 * Returns zero for success, or a negative error code. 611 */ 612 int snd_hdac_bus_alloc_stream_pages(struct hdac_bus *bus) 613 { 614 struct hdac_stream *s; 615 int num_streams = 0; 616 int dma_type = bus->dma_type ? bus->dma_type : SNDRV_DMA_TYPE_DEV; 617 int err; 618 619 list_for_each_entry(s, &bus->stream_list, list) { 620 /* allocate memory for the BDL for each stream */ 621 err = snd_dma_alloc_pages(dma_type, bus->dev, 622 BDL_SIZE, &s->bdl); 623 num_streams++; 624 if (err < 0) 625 return -ENOMEM; 626 } 627 628 if (WARN_ON(!num_streams)) 629 return -EINVAL; 630 /* allocate memory for the position buffer */ 631 err = snd_dma_alloc_pages(dma_type, bus->dev, 632 num_streams * 8, &bus->posbuf); 633 if (err < 0) 634 return -ENOMEM; 635 list_for_each_entry(s, &bus->stream_list, list) 636 s->posbuf = (__le32 *)(bus->posbuf.area + s->index * 8); 637 638 /* single page (at least 4096 bytes) must suffice for both ringbuffes */ 639 return snd_dma_alloc_pages(dma_type, bus->dev, PAGE_SIZE, &bus->rb); 640 } 641 EXPORT_SYMBOL_GPL(snd_hdac_bus_alloc_stream_pages); 642 643 /** 644 * snd_hdac_bus_free_stream_pages - release BDL and other buffers 645 * @bus: HD-audio core bus 646 */ 647 void snd_hdac_bus_free_stream_pages(struct hdac_bus *bus) 648 { 649 struct hdac_stream *s; 650 651 list_for_each_entry(s, &bus->stream_list, list) { 652 if (s->bdl.area) 653 snd_dma_free_pages(&s->bdl); 654 } 655 656 if (bus->rb.area) 657 snd_dma_free_pages(&bus->rb); 658 if (bus->posbuf.area) 659 snd_dma_free_pages(&bus->posbuf); 660 } 661 EXPORT_SYMBOL_GPL(snd_hdac_bus_free_stream_pages); 662