1 /* 2 * Copyright (C) 2015 VanguardiaSur - www.vanguardiasur.com.ar 3 * 4 * Based on the audio support from the tw6869 driver: 5 * Copyright 2015 www.starterkit.ru <info@starterkit.ru> 6 * 7 * Based on: 8 * Driver for Intersil|Techwell TW6869 based DVR cards 9 * (c) 2011-12 liran <jli11@intersil.com> [Intersil|Techwell China] 10 * 11 * This program is free software; you can redistribute it and/or modify it 12 * under the terms of version 2 of the GNU General Public License 13 * as published by the Free Software Foundation. 14 */ 15 16 #include <linux/types.h> 17 #include <linux/kernel.h> 18 #include <linux/module.h> 19 #include <linux/init.h> 20 #include <linux/kmod.h> 21 #include <linux/mutex.h> 22 #include <linux/pci.h> 23 #include <linux/delay.h> 24 25 #include <sound/core.h> 26 #include <sound/initval.h> 27 #include <sound/pcm.h> 28 #include <sound/control.h> 29 #include "tw686x.h" 30 #include "tw686x-regs.h" 31 32 #define AUDIO_CHANNEL_OFFSET 8 33 34 void tw686x_audio_irq(struct tw686x_dev *dev, unsigned long requests, 35 unsigned int pb_status) 36 { 37 unsigned long flags; 38 unsigned int ch, pb; 39 40 for_each_set_bit(ch, &requests, max_channels(dev)) { 41 struct tw686x_audio_channel *ac = &dev->audio_channels[ch]; 42 struct tw686x_audio_buf *done = NULL; 43 struct tw686x_audio_buf *next = NULL; 44 struct tw686x_dma_desc *desc; 45 46 pb = !!(pb_status & BIT(AUDIO_CHANNEL_OFFSET + ch)); 47 48 spin_lock_irqsave(&ac->lock, flags); 49 50 /* Sanity check */ 51 if (!ac->ss || !ac->curr_bufs[0] || !ac->curr_bufs[1]) { 52 spin_unlock_irqrestore(&ac->lock, flags); 53 continue; 54 } 55 56 if (!list_empty(&ac->buf_list)) { 57 next = list_first_entry(&ac->buf_list, 58 struct tw686x_audio_buf, list); 59 list_move_tail(&next->list, &ac->buf_list); 60 done = ac->curr_bufs[!pb]; 61 ac->curr_bufs[pb] = next; 62 } 63 spin_unlock_irqrestore(&ac->lock, flags); 64 65 if (!done || !next) 66 continue; 67 /* 68 * Checking for a non-nil dma_desc[pb]->virt buffer is 69 * the same as checking for memcpy DMA mode. 70 */ 71 desc = &ac->dma_descs[pb]; 72 if (desc->virt) { 73 memcpy(done->virt, desc->virt, 74 dev->period_size); 75 } else { 76 u32 reg = pb ? ADMA_B_ADDR[ch] : ADMA_P_ADDR[ch]; 77 reg_write(dev, reg, next->dma); 78 } 79 ac->ptr = done->dma - ac->buf[0].dma; 80 snd_pcm_period_elapsed(ac->ss); 81 } 82 } 83 84 static int tw686x_pcm_hw_params(struct snd_pcm_substream *ss, 85 struct snd_pcm_hw_params *hw_params) 86 { 87 return snd_pcm_lib_malloc_pages(ss, params_buffer_bytes(hw_params)); 88 } 89 90 static int tw686x_pcm_hw_free(struct snd_pcm_substream *ss) 91 { 92 return snd_pcm_lib_free_pages(ss); 93 } 94 95 /* 96 * Audio parameters are global and shared among all 97 * capture channels. The driver prevents changes to 98 * the parameters if any audio channel is capturing. 99 */ 100 static const struct snd_pcm_hardware tw686x_capture_hw = { 101 .info = (SNDRV_PCM_INFO_MMAP | 102 SNDRV_PCM_INFO_INTERLEAVED | 103 SNDRV_PCM_INFO_BLOCK_TRANSFER | 104 SNDRV_PCM_INFO_MMAP_VALID), 105 .formats = SNDRV_PCM_FMTBIT_S16_LE, 106 .rates = SNDRV_PCM_RATE_8000_48000, 107 .rate_min = 8000, 108 .rate_max = 48000, 109 .channels_min = 1, 110 .channels_max = 1, 111 .buffer_bytes_max = TW686X_AUDIO_PAGE_MAX * AUDIO_DMA_SIZE_MAX, 112 .period_bytes_min = AUDIO_DMA_SIZE_MIN, 113 .period_bytes_max = AUDIO_DMA_SIZE_MAX, 114 .periods_min = TW686X_AUDIO_PERIODS_MIN, 115 .periods_max = TW686X_AUDIO_PERIODS_MAX, 116 }; 117 118 static int tw686x_pcm_open(struct snd_pcm_substream *ss) 119 { 120 struct tw686x_dev *dev = snd_pcm_substream_chip(ss); 121 struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number]; 122 struct snd_pcm_runtime *rt = ss->runtime; 123 int err; 124 125 ac->ss = ss; 126 rt->hw = tw686x_capture_hw; 127 128 err = snd_pcm_hw_constraint_integer(rt, SNDRV_PCM_HW_PARAM_PERIODS); 129 if (err < 0) 130 return err; 131 132 return 0; 133 } 134 135 static int tw686x_pcm_close(struct snd_pcm_substream *ss) 136 { 137 struct tw686x_dev *dev = snd_pcm_substream_chip(ss); 138 struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number]; 139 140 ac->ss = NULL; 141 return 0; 142 } 143 144 static int tw686x_pcm_prepare(struct snd_pcm_substream *ss) 145 { 146 struct tw686x_dev *dev = snd_pcm_substream_chip(ss); 147 struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number]; 148 struct snd_pcm_runtime *rt = ss->runtime; 149 unsigned int period_size = snd_pcm_lib_period_bytes(ss); 150 struct tw686x_audio_buf *p_buf, *b_buf; 151 unsigned long flags; 152 int i; 153 154 spin_lock_irqsave(&dev->lock, flags); 155 /* 156 * Given the audio parameters are global (i.e. shared across 157 * DMA channels), we need to check new params are allowed. 158 */ 159 if (((dev->audio_rate != rt->rate) || 160 (dev->period_size != period_size)) && dev->audio_enabled) 161 goto err_audio_busy; 162 163 tw686x_disable_channel(dev, AUDIO_CHANNEL_OFFSET + ac->ch); 164 spin_unlock_irqrestore(&dev->lock, flags); 165 166 if (dev->audio_rate != rt->rate) { 167 u32 reg; 168 169 dev->audio_rate = rt->rate; 170 reg = ((125000000 / rt->rate) << 16) + 171 ((125000000 % rt->rate) << 16) / rt->rate; 172 173 reg_write(dev, AUDIO_CONTROL2, reg); 174 } 175 176 if (dev->period_size != period_size) { 177 u32 reg; 178 179 dev->period_size = period_size; 180 reg = reg_read(dev, AUDIO_CONTROL1); 181 reg &= ~(AUDIO_DMA_SIZE_MASK << AUDIO_DMA_SIZE_SHIFT); 182 reg |= period_size << AUDIO_DMA_SIZE_SHIFT; 183 184 reg_write(dev, AUDIO_CONTROL1, reg); 185 } 186 187 if (rt->periods < TW686X_AUDIO_PERIODS_MIN || 188 rt->periods > TW686X_AUDIO_PERIODS_MAX) 189 return -EINVAL; 190 191 spin_lock_irqsave(&ac->lock, flags); 192 INIT_LIST_HEAD(&ac->buf_list); 193 194 for (i = 0; i < rt->periods; i++) { 195 ac->buf[i].dma = rt->dma_addr + period_size * i; 196 ac->buf[i].virt = rt->dma_area + period_size * i; 197 INIT_LIST_HEAD(&ac->buf[i].list); 198 list_add_tail(&ac->buf[i].list, &ac->buf_list); 199 } 200 201 p_buf = list_first_entry(&ac->buf_list, struct tw686x_audio_buf, list); 202 list_move_tail(&p_buf->list, &ac->buf_list); 203 204 b_buf = list_first_entry(&ac->buf_list, struct tw686x_audio_buf, list); 205 list_move_tail(&b_buf->list, &ac->buf_list); 206 207 ac->curr_bufs[0] = p_buf; 208 ac->curr_bufs[1] = b_buf; 209 ac->ptr = 0; 210 211 if (dev->dma_mode != TW686X_DMA_MODE_MEMCPY) { 212 reg_write(dev, ADMA_P_ADDR[ac->ch], p_buf->dma); 213 reg_write(dev, ADMA_B_ADDR[ac->ch], b_buf->dma); 214 } 215 216 spin_unlock_irqrestore(&ac->lock, flags); 217 218 return 0; 219 220 err_audio_busy: 221 spin_unlock_irqrestore(&dev->lock, flags); 222 return -EBUSY; 223 } 224 225 static int tw686x_pcm_trigger(struct snd_pcm_substream *ss, int cmd) 226 { 227 struct tw686x_dev *dev = snd_pcm_substream_chip(ss); 228 struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number]; 229 unsigned long flags; 230 int err = 0; 231 232 switch (cmd) { 233 case SNDRV_PCM_TRIGGER_START: 234 if (ac->curr_bufs[0] && ac->curr_bufs[1]) { 235 spin_lock_irqsave(&dev->lock, flags); 236 dev->audio_enabled = 1; 237 tw686x_enable_channel(dev, 238 AUDIO_CHANNEL_OFFSET + ac->ch); 239 spin_unlock_irqrestore(&dev->lock, flags); 240 241 mod_timer(&dev->dma_delay_timer, 242 jiffies + msecs_to_jiffies(100)); 243 } else { 244 err = -EIO; 245 } 246 break; 247 case SNDRV_PCM_TRIGGER_STOP: 248 spin_lock_irqsave(&dev->lock, flags); 249 dev->audio_enabled = 0; 250 tw686x_disable_channel(dev, AUDIO_CHANNEL_OFFSET + ac->ch); 251 spin_unlock_irqrestore(&dev->lock, flags); 252 253 spin_lock_irqsave(&ac->lock, flags); 254 ac->curr_bufs[0] = NULL; 255 ac->curr_bufs[1] = NULL; 256 spin_unlock_irqrestore(&ac->lock, flags); 257 break; 258 default: 259 err = -EINVAL; 260 } 261 return err; 262 } 263 264 static snd_pcm_uframes_t tw686x_pcm_pointer(struct snd_pcm_substream *ss) 265 { 266 struct tw686x_dev *dev = snd_pcm_substream_chip(ss); 267 struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number]; 268 269 return bytes_to_frames(ss->runtime, ac->ptr); 270 } 271 272 static const struct snd_pcm_ops tw686x_pcm_ops = { 273 .open = tw686x_pcm_open, 274 .close = tw686x_pcm_close, 275 .ioctl = snd_pcm_lib_ioctl, 276 .hw_params = tw686x_pcm_hw_params, 277 .hw_free = tw686x_pcm_hw_free, 278 .prepare = tw686x_pcm_prepare, 279 .trigger = tw686x_pcm_trigger, 280 .pointer = tw686x_pcm_pointer, 281 }; 282 283 static int tw686x_snd_pcm_init(struct tw686x_dev *dev) 284 { 285 struct snd_card *card = dev->snd_card; 286 struct snd_pcm *pcm; 287 struct snd_pcm_substream *ss; 288 unsigned int i; 289 int err; 290 291 err = snd_pcm_new(card, card->driver, 0, 0, max_channels(dev), &pcm); 292 if (err < 0) 293 return err; 294 295 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &tw686x_pcm_ops); 296 snd_pcm_chip(pcm) = dev; 297 pcm->info_flags = 0; 298 strlcpy(pcm->name, "tw686x PCM", sizeof(pcm->name)); 299 300 for (i = 0, ss = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; 301 ss; ss = ss->next, i++) 302 snprintf(ss->name, sizeof(ss->name), "vch%u audio", i); 303 304 return snd_pcm_lib_preallocate_pages_for_all(pcm, 305 SNDRV_DMA_TYPE_DEV, 306 snd_dma_pci_data(dev->pci_dev), 307 TW686X_AUDIO_PAGE_MAX * AUDIO_DMA_SIZE_MAX, 308 TW686X_AUDIO_PAGE_MAX * AUDIO_DMA_SIZE_MAX); 309 } 310 311 static void tw686x_audio_dma_free(struct tw686x_dev *dev, 312 struct tw686x_audio_channel *ac) 313 { 314 int pb; 315 316 for (pb = 0; pb < 2; pb++) { 317 if (!ac->dma_descs[pb].virt) 318 continue; 319 pci_free_consistent(dev->pci_dev, ac->dma_descs[pb].size, 320 ac->dma_descs[pb].virt, 321 ac->dma_descs[pb].phys); 322 ac->dma_descs[pb].virt = NULL; 323 } 324 } 325 326 static int tw686x_audio_dma_alloc(struct tw686x_dev *dev, 327 struct tw686x_audio_channel *ac) 328 { 329 int pb; 330 331 /* 332 * In the memcpy DMA mode we allocate a consistent buffer 333 * and use it for the DMA capture. Otherwise, DMA 334 * acts on the ALSA buffers as received in pcm_prepare. 335 */ 336 if (dev->dma_mode != TW686X_DMA_MODE_MEMCPY) 337 return 0; 338 339 for (pb = 0; pb < 2; pb++) { 340 u32 reg = pb ? ADMA_B_ADDR[ac->ch] : ADMA_P_ADDR[ac->ch]; 341 void *virt; 342 343 virt = pci_alloc_consistent(dev->pci_dev, AUDIO_DMA_SIZE_MAX, 344 &ac->dma_descs[pb].phys); 345 if (!virt) { 346 dev_err(&dev->pci_dev->dev, 347 "dma%d: unable to allocate audio DMA %s-buffer\n", 348 ac->ch, pb ? "B" : "P"); 349 return -ENOMEM; 350 } 351 ac->dma_descs[pb].virt = virt; 352 ac->dma_descs[pb].size = AUDIO_DMA_SIZE_MAX; 353 reg_write(dev, reg, ac->dma_descs[pb].phys); 354 } 355 return 0; 356 } 357 358 void tw686x_audio_free(struct tw686x_dev *dev) 359 { 360 unsigned long flags; 361 u32 dma_ch_mask; 362 u32 dma_cmd; 363 364 spin_lock_irqsave(&dev->lock, flags); 365 dma_cmd = reg_read(dev, DMA_CMD); 366 dma_ch_mask = reg_read(dev, DMA_CHANNEL_ENABLE); 367 reg_write(dev, DMA_CMD, dma_cmd & ~0xff00); 368 reg_write(dev, DMA_CHANNEL_ENABLE, dma_ch_mask & ~0xff00); 369 spin_unlock_irqrestore(&dev->lock, flags); 370 371 if (!dev->snd_card) 372 return; 373 snd_card_free(dev->snd_card); 374 dev->snd_card = NULL; 375 } 376 377 int tw686x_audio_init(struct tw686x_dev *dev) 378 { 379 struct pci_dev *pci_dev = dev->pci_dev; 380 struct snd_card *card; 381 int err, ch; 382 383 /* Enable external audio */ 384 reg_write(dev, AUDIO_CONTROL1, BIT(0)); 385 386 err = snd_card_new(&pci_dev->dev, SNDRV_DEFAULT_IDX1, 387 SNDRV_DEFAULT_STR1, 388 THIS_MODULE, 0, &card); 389 if (err < 0) 390 return err; 391 392 dev->snd_card = card; 393 strlcpy(card->driver, "tw686x", sizeof(card->driver)); 394 strlcpy(card->shortname, "tw686x", sizeof(card->shortname)); 395 strlcpy(card->longname, pci_name(pci_dev), sizeof(card->longname)); 396 snd_card_set_dev(card, &pci_dev->dev); 397 398 for (ch = 0; ch < max_channels(dev); ch++) { 399 struct tw686x_audio_channel *ac; 400 401 ac = &dev->audio_channels[ch]; 402 spin_lock_init(&ac->lock); 403 ac->dev = dev; 404 ac->ch = ch; 405 406 err = tw686x_audio_dma_alloc(dev, ac); 407 if (err < 0) 408 goto err_cleanup; 409 } 410 411 err = tw686x_snd_pcm_init(dev); 412 if (err < 0) 413 goto err_cleanup; 414 415 err = snd_card_register(card); 416 if (!err) 417 return 0; 418 419 err_cleanup: 420 for (ch = 0; ch < max_channels(dev); ch++) { 421 if (!dev->audio_channels[ch].dev) 422 continue; 423 tw686x_audio_dma_free(dev, &dev->audio_channels[ch]); 424 } 425 snd_card_free(card); 426 dev->snd_card = NULL; 427 return err; 428 } 429