1 /* 2 * HD-audio controller helpers 3 */ 4 5 #include <linux/kernel.h> 6 #include <linux/delay.h> 7 #include <linux/export.h> 8 #include <sound/core.h> 9 #include <sound/hdaudio.h> 10 #include <sound/hda_register.h> 11 12 /* clear CORB read pointer properly */ 13 static void azx_clear_corbrp(struct hdac_bus *bus) 14 { 15 int timeout; 16 17 for (timeout = 1000; timeout > 0; timeout--) { 18 if (snd_hdac_chip_readw(bus, CORBRP) & AZX_CORBRP_RST) 19 break; 20 udelay(1); 21 } 22 if (timeout <= 0) 23 dev_err(bus->dev, "CORB reset timeout#1, CORBRP = %d\n", 24 snd_hdac_chip_readw(bus, CORBRP)); 25 26 snd_hdac_chip_writew(bus, CORBRP, 0); 27 for (timeout = 1000; timeout > 0; timeout--) { 28 if (snd_hdac_chip_readw(bus, CORBRP) == 0) 29 break; 30 udelay(1); 31 } 32 if (timeout <= 0) 33 dev_err(bus->dev, "CORB reset timeout#2, CORBRP = %d\n", 34 snd_hdac_chip_readw(bus, CORBRP)); 35 } 36 37 /** 38 * snd_hdac_bus_init_cmd_io - set up CORB/RIRB buffers 39 * @bus: HD-audio core bus 40 */ 41 void snd_hdac_bus_init_cmd_io(struct hdac_bus *bus) 42 { 43 spin_lock_irq(&bus->reg_lock); 44 /* CORB set up */ 45 bus->corb.addr = bus->rb.addr; 46 bus->corb.buf = (__le32 *)bus->rb.area; 47 snd_hdac_chip_writel(bus, CORBLBASE, (u32)bus->corb.addr); 48 snd_hdac_chip_writel(bus, CORBUBASE, upper_32_bits(bus->corb.addr)); 49 50 /* set the corb size to 256 entries (ULI requires explicitly) */ 51 snd_hdac_chip_writeb(bus, CORBSIZE, 0x02); 52 /* set the corb write pointer to 0 */ 53 snd_hdac_chip_writew(bus, CORBWP, 0); 54 55 /* reset the corb hw read pointer */ 56 snd_hdac_chip_writew(bus, CORBRP, AZX_CORBRP_RST); 57 if (!bus->corbrp_self_clear) 58 azx_clear_corbrp(bus); 59 60 /* enable corb dma */ 61 snd_hdac_chip_writeb(bus, CORBCTL, AZX_CORBCTL_RUN); 62 63 /* RIRB set up */ 64 bus->rirb.addr = bus->rb.addr + 2048; 65 bus->rirb.buf = (__le32 *)(bus->rb.area + 2048); 66 bus->rirb.wp = bus->rirb.rp = 0; 67 memset(bus->rirb.cmds, 0, sizeof(bus->rirb.cmds)); 68 snd_hdac_chip_writel(bus, RIRBLBASE, (u32)bus->rirb.addr); 69 snd_hdac_chip_writel(bus, RIRBUBASE, upper_32_bits(bus->rirb.addr)); 70 71 /* set the rirb size to 256 entries (ULI requires explicitly) */ 72 snd_hdac_chip_writeb(bus, RIRBSIZE, 0x02); 73 /* reset the rirb hw write pointer */ 74 snd_hdac_chip_writew(bus, RIRBWP, AZX_RIRBWP_RST); 75 /* set N=1, get RIRB response interrupt for new entry */ 76 snd_hdac_chip_writew(bus, RINTCNT, 1); 77 /* enable rirb dma and response irq */ 78 snd_hdac_chip_writeb(bus, RIRBCTL, AZX_RBCTL_DMA_EN | AZX_RBCTL_IRQ_EN); 79 spin_unlock_irq(&bus->reg_lock); 80 } 81 EXPORT_SYMBOL_GPL(snd_hdac_bus_init_cmd_io); 82 83 /* wait for cmd dmas till they are stopped */ 84 static void hdac_wait_for_cmd_dmas(struct hdac_bus *bus) 85 { 86 unsigned long timeout; 87 88 timeout = jiffies + msecs_to_jiffies(100); 89 while ((snd_hdac_chip_readb(bus, RIRBCTL) & AZX_RBCTL_DMA_EN) 90 && time_before(jiffies, timeout)) 91 udelay(10); 92 93 timeout = jiffies + msecs_to_jiffies(100); 94 while ((snd_hdac_chip_readb(bus, CORBCTL) & AZX_CORBCTL_RUN) 95 && time_before(jiffies, timeout)) 96 udelay(10); 97 } 98 99 /** 100 * snd_hdac_bus_stop_cmd_io - clean up CORB/RIRB buffers 101 * @bus: HD-audio core bus 102 */ 103 void snd_hdac_bus_stop_cmd_io(struct hdac_bus *bus) 104 { 105 spin_lock_irq(&bus->reg_lock); 106 /* disable ringbuffer DMAs */ 107 snd_hdac_chip_writeb(bus, RIRBCTL, 0); 108 snd_hdac_chip_writeb(bus, CORBCTL, 0); 109 hdac_wait_for_cmd_dmas(bus); 110 /* disable unsolicited responses */ 111 snd_hdac_chip_updatel(bus, GCTL, AZX_GCTL_UNSOL, 0); 112 spin_unlock_irq(&bus->reg_lock); 113 } 114 EXPORT_SYMBOL_GPL(snd_hdac_bus_stop_cmd_io); 115 116 static unsigned int azx_command_addr(u32 cmd) 117 { 118 unsigned int addr = cmd >> 28; 119 120 if (snd_BUG_ON(addr >= HDA_MAX_CODECS)) 121 addr = 0; 122 return addr; 123 } 124 125 /** 126 * snd_hdac_bus_send_cmd - send a command verb via CORB 127 * @bus: HD-audio core bus 128 * @val: encoded verb value to send 129 * 130 * Returns zero for success or a negative error code. 131 */ 132 int snd_hdac_bus_send_cmd(struct hdac_bus *bus, unsigned int val) 133 { 134 unsigned int addr = azx_command_addr(val); 135 unsigned int wp, rp; 136 137 spin_lock_irq(&bus->reg_lock); 138 139 bus->last_cmd[azx_command_addr(val)] = val; 140 141 /* add command to corb */ 142 wp = snd_hdac_chip_readw(bus, CORBWP); 143 if (wp == 0xffff) { 144 /* something wrong, controller likely turned to D3 */ 145 spin_unlock_irq(&bus->reg_lock); 146 return -EIO; 147 } 148 wp++; 149 wp %= AZX_MAX_CORB_ENTRIES; 150 151 rp = snd_hdac_chip_readw(bus, CORBRP); 152 if (wp == rp) { 153 /* oops, it's full */ 154 spin_unlock_irq(&bus->reg_lock); 155 return -EAGAIN; 156 } 157 158 bus->rirb.cmds[addr]++; 159 bus->corb.buf[wp] = cpu_to_le32(val); 160 snd_hdac_chip_writew(bus, CORBWP, wp); 161 162 spin_unlock_irq(&bus->reg_lock); 163 164 return 0; 165 } 166 EXPORT_SYMBOL_GPL(snd_hdac_bus_send_cmd); 167 168 #define AZX_RIRB_EX_UNSOL_EV (1<<4) 169 170 /** 171 * snd_hdac_bus_update_rirb - retrieve RIRB entries 172 * @bus: HD-audio core bus 173 * 174 * Usually called from interrupt handler. 175 */ 176 void snd_hdac_bus_update_rirb(struct hdac_bus *bus) 177 { 178 unsigned int rp, wp; 179 unsigned int addr; 180 u32 res, res_ex; 181 182 wp = snd_hdac_chip_readw(bus, RIRBWP); 183 if (wp == 0xffff) { 184 /* something wrong, controller likely turned to D3 */ 185 return; 186 } 187 188 if (wp == bus->rirb.wp) 189 return; 190 bus->rirb.wp = wp; 191 192 while (bus->rirb.rp != wp) { 193 bus->rirb.rp++; 194 bus->rirb.rp %= AZX_MAX_RIRB_ENTRIES; 195 196 rp = bus->rirb.rp << 1; /* an RIRB entry is 8-bytes */ 197 res_ex = le32_to_cpu(bus->rirb.buf[rp + 1]); 198 res = le32_to_cpu(bus->rirb.buf[rp]); 199 addr = res_ex & 0xf; 200 if (addr >= HDA_MAX_CODECS) { 201 dev_err(bus->dev, 202 "spurious response %#x:%#x, rp = %d, wp = %d", 203 res, res_ex, bus->rirb.rp, wp); 204 snd_BUG(); 205 } else if (res_ex & AZX_RIRB_EX_UNSOL_EV) 206 snd_hdac_bus_queue_event(bus, res, res_ex); 207 else if (bus->rirb.cmds[addr]) { 208 bus->rirb.res[addr] = res; 209 bus->rirb.cmds[addr]--; 210 } else { 211 dev_err_ratelimited(bus->dev, 212 "spurious response %#x:%#x, last cmd=%#08x\n", 213 res, res_ex, bus->last_cmd[addr]); 214 } 215 } 216 } 217 EXPORT_SYMBOL_GPL(snd_hdac_bus_update_rirb); 218 219 /** 220 * snd_hdac_bus_get_response - receive a response via RIRB 221 * @bus: HD-audio core bus 222 * @addr: codec address 223 * @res: pointer to store the value, NULL when not needed 224 * 225 * Returns zero if a value is read, or a negative error code. 226 */ 227 int snd_hdac_bus_get_response(struct hdac_bus *bus, unsigned int addr, 228 unsigned int *res) 229 { 230 unsigned long timeout; 231 unsigned long loopcounter; 232 233 timeout = jiffies + msecs_to_jiffies(1000); 234 235 for (loopcounter = 0;; loopcounter++) { 236 spin_lock_irq(&bus->reg_lock); 237 if (!bus->rirb.cmds[addr]) { 238 if (res) 239 *res = bus->rirb.res[addr]; /* the last value */ 240 spin_unlock_irq(&bus->reg_lock); 241 return 0; 242 } 243 spin_unlock_irq(&bus->reg_lock); 244 if (time_after(jiffies, timeout)) 245 break; 246 if (loopcounter > 3000) 247 msleep(2); /* temporary workaround */ 248 else { 249 udelay(10); 250 cond_resched(); 251 } 252 } 253 254 return -EIO; 255 } 256 EXPORT_SYMBOL_GPL(snd_hdac_bus_get_response); 257 258 /* 259 * Lowlevel interface 260 */ 261 262 /** 263 * snd_hdac_bus_enter_link_reset - enter link reset 264 * @bus: HD-audio core bus 265 * 266 * Enter to the link reset state. 267 */ 268 void snd_hdac_bus_enter_link_reset(struct hdac_bus *bus) 269 { 270 unsigned long timeout; 271 272 /* reset controller */ 273 snd_hdac_chip_updatel(bus, GCTL, AZX_GCTL_RESET, 0); 274 275 timeout = jiffies + msecs_to_jiffies(100); 276 while ((snd_hdac_chip_readb(bus, GCTL) & AZX_GCTL_RESET) && 277 time_before(jiffies, timeout)) 278 usleep_range(500, 1000); 279 } 280 EXPORT_SYMBOL_GPL(snd_hdac_bus_enter_link_reset); 281 282 /** 283 * snd_hdac_bus_exit_link_reset - exit link reset 284 * @bus: HD-audio core bus 285 * 286 * Exit from the link reset state. 287 */ 288 void snd_hdac_bus_exit_link_reset(struct hdac_bus *bus) 289 { 290 unsigned long timeout; 291 292 snd_hdac_chip_updateb(bus, GCTL, 0, AZX_GCTL_RESET); 293 294 timeout = jiffies + msecs_to_jiffies(100); 295 while (!snd_hdac_chip_readb(bus, GCTL) && time_before(jiffies, timeout)) 296 usleep_range(500, 1000); 297 } 298 EXPORT_SYMBOL_GPL(snd_hdac_bus_exit_link_reset); 299 300 /* reset codec link */ 301 static int azx_reset(struct hdac_bus *bus, bool full_reset) 302 { 303 if (!full_reset) 304 goto skip_reset; 305 306 /* clear STATESTS */ 307 snd_hdac_chip_writew(bus, STATESTS, STATESTS_INT_MASK); 308 309 /* reset controller */ 310 snd_hdac_bus_enter_link_reset(bus); 311 312 /* delay for >= 100us for codec PLL to settle per spec 313 * Rev 0.9 section 5.5.1 314 */ 315 usleep_range(500, 1000); 316 317 /* Bring controller out of reset */ 318 snd_hdac_bus_exit_link_reset(bus); 319 320 /* Brent Chartrand said to wait >= 540us for codecs to initialize */ 321 usleep_range(1000, 1200); 322 323 skip_reset: 324 /* check to see if controller is ready */ 325 if (!snd_hdac_chip_readb(bus, GCTL)) { 326 dev_dbg(bus->dev, "azx_reset: controller not ready!\n"); 327 return -EBUSY; 328 } 329 330 /* Accept unsolicited responses */ 331 snd_hdac_chip_updatel(bus, GCTL, 0, AZX_GCTL_UNSOL); 332 333 /* detect codecs */ 334 if (!bus->codec_mask) { 335 bus->codec_mask = snd_hdac_chip_readw(bus, STATESTS); 336 dev_dbg(bus->dev, "codec_mask = 0x%lx\n", bus->codec_mask); 337 } 338 339 return 0; 340 } 341 342 /* enable interrupts */ 343 static void azx_int_enable(struct hdac_bus *bus) 344 { 345 /* enable controller CIE and GIE */ 346 snd_hdac_chip_updatel(bus, INTCTL, 0, AZX_INT_CTRL_EN | AZX_INT_GLOBAL_EN); 347 } 348 349 /* disable interrupts */ 350 static void azx_int_disable(struct hdac_bus *bus) 351 { 352 struct hdac_stream *azx_dev; 353 354 /* disable interrupts in stream descriptor */ 355 list_for_each_entry(azx_dev, &bus->stream_list, list) 356 snd_hdac_stream_updateb(azx_dev, SD_CTL, SD_INT_MASK, 0); 357 358 /* disable SIE for all streams */ 359 snd_hdac_chip_writeb(bus, INTCTL, 0); 360 361 /* disable controller CIE and GIE */ 362 snd_hdac_chip_updatel(bus, INTCTL, AZX_INT_CTRL_EN | AZX_INT_GLOBAL_EN, 0); 363 } 364 365 /* clear interrupts */ 366 static void azx_int_clear(struct hdac_bus *bus) 367 { 368 struct hdac_stream *azx_dev; 369 370 /* clear stream status */ 371 list_for_each_entry(azx_dev, &bus->stream_list, list) 372 snd_hdac_stream_writeb(azx_dev, SD_STS, SD_INT_MASK); 373 374 /* clear STATESTS */ 375 snd_hdac_chip_writew(bus, STATESTS, STATESTS_INT_MASK); 376 377 /* clear rirb status */ 378 snd_hdac_chip_writeb(bus, RIRBSTS, RIRB_INT_MASK); 379 380 /* clear int status */ 381 snd_hdac_chip_writel(bus, INTSTS, AZX_INT_CTRL_EN | AZX_INT_ALL_STREAM); 382 } 383 384 /** 385 * snd_hdac_bus_init_chip - reset and start the controller registers 386 * @bus: HD-audio core bus 387 * @full_reset: Do full reset 388 */ 389 bool snd_hdac_bus_init_chip(struct hdac_bus *bus, bool full_reset) 390 { 391 if (bus->chip_init) 392 return false; 393 394 /* reset controller */ 395 azx_reset(bus, full_reset); 396 397 /* initialize interrupts */ 398 azx_int_clear(bus); 399 azx_int_enable(bus); 400 401 /* initialize the codec command I/O */ 402 snd_hdac_bus_init_cmd_io(bus); 403 404 /* program the position buffer */ 405 if (bus->use_posbuf && bus->posbuf.addr) { 406 snd_hdac_chip_writel(bus, DPLBASE, (u32)bus->posbuf.addr); 407 snd_hdac_chip_writel(bus, DPUBASE, upper_32_bits(bus->posbuf.addr)); 408 } 409 410 bus->chip_init = true; 411 return true; 412 } 413 EXPORT_SYMBOL_GPL(snd_hdac_bus_init_chip); 414 415 /** 416 * snd_hdac_bus_stop_chip - disable the whole IRQ and I/Os 417 * @bus: HD-audio core bus 418 */ 419 void snd_hdac_bus_stop_chip(struct hdac_bus *bus) 420 { 421 if (!bus->chip_init) 422 return; 423 424 /* disable interrupts */ 425 azx_int_disable(bus); 426 azx_int_clear(bus); 427 428 /* disable CORB/RIRB */ 429 snd_hdac_bus_stop_cmd_io(bus); 430 431 /* disable position buffer */ 432 if (bus->posbuf.addr) { 433 snd_hdac_chip_writel(bus, DPLBASE, 0); 434 snd_hdac_chip_writel(bus, DPUBASE, 0); 435 } 436 437 bus->chip_init = false; 438 } 439 EXPORT_SYMBOL_GPL(snd_hdac_bus_stop_chip); 440 441 /** 442 * snd_hdac_bus_handle_stream_irq - interrupt handler for streams 443 * @bus: HD-audio core bus 444 * @status: INTSTS register value 445 * @ask: callback to be called for woken streams 446 * 447 * Returns the bits of handled streams, or zero if no stream is handled. 448 */ 449 int snd_hdac_bus_handle_stream_irq(struct hdac_bus *bus, unsigned int status, 450 void (*ack)(struct hdac_bus *, 451 struct hdac_stream *)) 452 { 453 struct hdac_stream *azx_dev; 454 u8 sd_status; 455 int handled = 0; 456 457 list_for_each_entry(azx_dev, &bus->stream_list, list) { 458 if (status & azx_dev->sd_int_sta_mask) { 459 sd_status = snd_hdac_stream_readb(azx_dev, SD_STS); 460 snd_hdac_stream_writeb(azx_dev, SD_STS, SD_INT_MASK); 461 handled |= 1 << azx_dev->index; 462 if (!azx_dev->substream || !azx_dev->running || 463 !(sd_status & SD_INT_COMPLETE)) 464 continue; 465 if (ack) 466 ack(bus, azx_dev); 467 } 468 } 469 return handled; 470 } 471 EXPORT_SYMBOL_GPL(snd_hdac_bus_handle_stream_irq); 472 473 /** 474 * snd_hdac_bus_alloc_stream_pages - allocate BDL and other buffers 475 * @bus: HD-audio core bus 476 * 477 * Call this after assigning the all streams. 478 * Returns zero for success, or a negative error code. 479 */ 480 int snd_hdac_bus_alloc_stream_pages(struct hdac_bus *bus) 481 { 482 struct hdac_stream *s; 483 int num_streams = 0; 484 int err; 485 486 list_for_each_entry(s, &bus->stream_list, list) { 487 /* allocate memory for the BDL for each stream */ 488 err = bus->io_ops->dma_alloc_pages(bus, SNDRV_DMA_TYPE_DEV, 489 BDL_SIZE, &s->bdl); 490 num_streams++; 491 if (err < 0) 492 return -ENOMEM; 493 } 494 495 if (WARN_ON(!num_streams)) 496 return -EINVAL; 497 /* allocate memory for the position buffer */ 498 err = bus->io_ops->dma_alloc_pages(bus, SNDRV_DMA_TYPE_DEV, 499 num_streams * 8, &bus->posbuf); 500 if (err < 0) 501 return -ENOMEM; 502 list_for_each_entry(s, &bus->stream_list, list) 503 s->posbuf = (__le32 *)(bus->posbuf.area + s->index * 8); 504 505 /* single page (at least 4096 bytes) must suffice for both ringbuffes */ 506 return bus->io_ops->dma_alloc_pages(bus, SNDRV_DMA_TYPE_DEV, 507 PAGE_SIZE, &bus->rb); 508 } 509 EXPORT_SYMBOL_GPL(snd_hdac_bus_alloc_stream_pages); 510 511 /** 512 * snd_hdac_bus_free_stream_pages - release BDL and other buffers 513 * @bus: HD-audio core bus 514 */ 515 void snd_hdac_bus_free_stream_pages(struct hdac_bus *bus) 516 { 517 struct hdac_stream *s; 518 519 list_for_each_entry(s, &bus->stream_list, list) { 520 if (s->bdl.area) 521 bus->io_ops->dma_free_pages(bus, &s->bdl); 522 } 523 524 if (bus->rb.area) 525 bus->io_ops->dma_free_pages(bus, &bus->rb); 526 if (bus->posbuf.area) 527 bus->io_ops->dma_free_pages(bus, &bus->posbuf); 528 } 529 EXPORT_SYMBOL_GPL(snd_hdac_bus_free_stream_pages); 530