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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) 2015 VanguardiaSur - www.vanguardiasur.com.ar4 *5 * Based on the audio support from the tw6869 driver:6 * Copyright 2015 www.starterkit.ru <info@starterkit.ru>7 *8 * Based on:9 * Driver for Intersil|Techwell TW6869 based DVR cards10 * (c) 2011-12 liran <jli11@intersil.com> [Intersil|Techwell China]11 */12 13#include <linux/types.h>14#include <linux/kernel.h>15#include <linux/module.h>16#include <linux/init.h>17#include <linux/kmod.h>18#include <linux/mutex.h>19#include <linux/pci.h>20#include <linux/delay.h>21 22#include <sound/core.h>23#include <sound/initval.h>24#include <sound/pcm.h>25#include <sound/control.h>26#include "tw686x.h"27#include "tw686x-regs.h"28 29#define AUDIO_CHANNEL_OFFSET 830 31void tw686x_audio_irq(struct tw686x_dev *dev, unsigned long requests,32 unsigned int pb_status)33{34 unsigned long flags;35 unsigned int ch, pb;36 37 for_each_set_bit(ch, &requests, max_channels(dev)) {38 struct tw686x_audio_channel *ac = &dev->audio_channels[ch];39 struct tw686x_audio_buf *done = NULL;40 struct tw686x_audio_buf *next = NULL;41 struct tw686x_dma_desc *desc;42 43 pb = !!(pb_status & BIT(AUDIO_CHANNEL_OFFSET + ch));44 45 spin_lock_irqsave(&ac->lock, flags);46 47 /* Sanity check */48 if (!ac->ss || !ac->curr_bufs[0] || !ac->curr_bufs[1]) {49 spin_unlock_irqrestore(&ac->lock, flags);50 continue;51 }52 53 if (!list_empty(&ac->buf_list)) {54 next = list_first_entry(&ac->buf_list,55 struct tw686x_audio_buf, list);56 list_move_tail(&next->list, &ac->buf_list);57 done = ac->curr_bufs[!pb];58 ac->curr_bufs[pb] = next;59 }60 spin_unlock_irqrestore(&ac->lock, flags);61 62 if (!done)63 continue;64 /*65 * Checking for a non-nil dma_desc[pb]->virt buffer is66 * the same as checking for memcpy DMA mode.67 */68 desc = &ac->dma_descs[pb];69 if (desc->virt) {70 memcpy(done->virt, desc->virt,71 dev->period_size);72 } else {73 u32 reg = pb ? ADMA_B_ADDR[ch] : ADMA_P_ADDR[ch];74 reg_write(dev, reg, next->dma);75 }76 ac->ptr = done->dma - ac->buf[0].dma;77 snd_pcm_period_elapsed(ac->ss);78 }79}80 81/*82 * Audio parameters are global and shared among all83 * capture channels. The driver prevents changes to84 * the parameters if any audio channel is capturing.85 */86static const struct snd_pcm_hardware tw686x_capture_hw = {87 .info = (SNDRV_PCM_INFO_MMAP |88 SNDRV_PCM_INFO_INTERLEAVED |89 SNDRV_PCM_INFO_BLOCK_TRANSFER |90 SNDRV_PCM_INFO_MMAP_VALID),91 .formats = SNDRV_PCM_FMTBIT_S16_LE,92 .rates = SNDRV_PCM_RATE_8000_48000,93 .rate_min = 8000,94 .rate_max = 48000,95 .channels_min = 1,96 .channels_max = 1,97 .buffer_bytes_max = TW686X_AUDIO_PAGE_MAX * AUDIO_DMA_SIZE_MAX,98 .period_bytes_min = AUDIO_DMA_SIZE_MIN,99 .period_bytes_max = AUDIO_DMA_SIZE_MAX,100 .periods_min = TW686X_AUDIO_PERIODS_MIN,101 .periods_max = TW686X_AUDIO_PERIODS_MAX,102};103 104static int tw686x_pcm_open(struct snd_pcm_substream *ss)105{106 struct tw686x_dev *dev = snd_pcm_substream_chip(ss);107 struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];108 struct snd_pcm_runtime *rt = ss->runtime;109 int err;110 111 ac->ss = ss;112 rt->hw = tw686x_capture_hw;113 114 err = snd_pcm_hw_constraint_integer(rt, SNDRV_PCM_HW_PARAM_PERIODS);115 if (err < 0)116 return err;117 118 return 0;119}120 121static int tw686x_pcm_close(struct snd_pcm_substream *ss)122{123 struct tw686x_dev *dev = snd_pcm_substream_chip(ss);124 struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];125 126 ac->ss = NULL;127 return 0;128}129 130static int tw686x_pcm_prepare(struct snd_pcm_substream *ss)131{132 struct tw686x_dev *dev = snd_pcm_substream_chip(ss);133 struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];134 struct snd_pcm_runtime *rt = ss->runtime;135 unsigned int period_size = snd_pcm_lib_period_bytes(ss);136 struct tw686x_audio_buf *p_buf, *b_buf;137 unsigned long flags;138 int i;139 140 spin_lock_irqsave(&dev->lock, flags);141 /*142 * Given the audio parameters are global (i.e. shared across143 * DMA channels), we need to check new params are allowed.144 */145 if (((dev->audio_rate != rt->rate) ||146 (dev->period_size != period_size)) && dev->audio_enabled)147 goto err_audio_busy;148 149 tw686x_disable_channel(dev, AUDIO_CHANNEL_OFFSET + ac->ch);150 spin_unlock_irqrestore(&dev->lock, flags);151 152 if (dev->audio_rate != rt->rate) {153 u32 reg;154 155 dev->audio_rate = rt->rate;156 reg = ((125000000 / rt->rate) << 16) +157 ((125000000 % rt->rate) << 16) / rt->rate;158 159 reg_write(dev, AUDIO_CONTROL2, reg);160 }161 162 if (dev->period_size != period_size) {163 u32 reg;164 165 dev->period_size = period_size;166 reg = reg_read(dev, AUDIO_CONTROL1);167 reg &= ~(AUDIO_DMA_SIZE_MASK << AUDIO_DMA_SIZE_SHIFT);168 reg |= period_size << AUDIO_DMA_SIZE_SHIFT;169 170 reg_write(dev, AUDIO_CONTROL1, reg);171 }172 173 if (rt->periods < TW686X_AUDIO_PERIODS_MIN ||174 rt->periods > TW686X_AUDIO_PERIODS_MAX)175 return -EINVAL;176 177 spin_lock_irqsave(&ac->lock, flags);178 INIT_LIST_HEAD(&ac->buf_list);179 180 for (i = 0; i < rt->periods; i++) {181 ac->buf[i].dma = rt->dma_addr + period_size * i;182 ac->buf[i].virt = rt->dma_area + period_size * i;183 INIT_LIST_HEAD(&ac->buf[i].list);184 list_add_tail(&ac->buf[i].list, &ac->buf_list);185 }186 187 p_buf = list_first_entry(&ac->buf_list, struct tw686x_audio_buf, list);188 list_move_tail(&p_buf->list, &ac->buf_list);189 190 b_buf = list_first_entry(&ac->buf_list, struct tw686x_audio_buf, list);191 list_move_tail(&b_buf->list, &ac->buf_list);192 193 ac->curr_bufs[0] = p_buf;194 ac->curr_bufs[1] = b_buf;195 ac->ptr = 0;196 197 if (dev->dma_mode != TW686X_DMA_MODE_MEMCPY) {198 reg_write(dev, ADMA_P_ADDR[ac->ch], p_buf->dma);199 reg_write(dev, ADMA_B_ADDR[ac->ch], b_buf->dma);200 }201 202 spin_unlock_irqrestore(&ac->lock, flags);203 204 return 0;205 206err_audio_busy:207 spin_unlock_irqrestore(&dev->lock, flags);208 return -EBUSY;209}210 211static int tw686x_pcm_trigger(struct snd_pcm_substream *ss, int cmd)212{213 struct tw686x_dev *dev = snd_pcm_substream_chip(ss);214 struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];215 unsigned long flags;216 int err = 0;217 218 switch (cmd) {219 case SNDRV_PCM_TRIGGER_START:220 if (ac->curr_bufs[0] && ac->curr_bufs[1]) {221 spin_lock_irqsave(&dev->lock, flags);222 dev->audio_enabled = 1;223 tw686x_enable_channel(dev,224 AUDIO_CHANNEL_OFFSET + ac->ch);225 spin_unlock_irqrestore(&dev->lock, flags);226 227 mod_timer(&dev->dma_delay_timer,228 jiffies + msecs_to_jiffies(100));229 } else {230 err = -EIO;231 }232 break;233 case SNDRV_PCM_TRIGGER_STOP:234 spin_lock_irqsave(&dev->lock, flags);235 dev->audio_enabled = 0;236 tw686x_disable_channel(dev, AUDIO_CHANNEL_OFFSET + ac->ch);237 spin_unlock_irqrestore(&dev->lock, flags);238 239 spin_lock_irqsave(&ac->lock, flags);240 ac->curr_bufs[0] = NULL;241 ac->curr_bufs[1] = NULL;242 spin_unlock_irqrestore(&ac->lock, flags);243 break;244 default:245 err = -EINVAL;246 }247 return err;248}249 250static snd_pcm_uframes_t tw686x_pcm_pointer(struct snd_pcm_substream *ss)251{252 struct tw686x_dev *dev = snd_pcm_substream_chip(ss);253 struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];254 255 return bytes_to_frames(ss->runtime, ac->ptr);256}257 258static const struct snd_pcm_ops tw686x_pcm_ops = {259 .open = tw686x_pcm_open,260 .close = tw686x_pcm_close,261 .prepare = tw686x_pcm_prepare,262 .trigger = tw686x_pcm_trigger,263 .pointer = tw686x_pcm_pointer,264};265 266static int tw686x_snd_pcm_init(struct tw686x_dev *dev)267{268 struct snd_card *card = dev->snd_card;269 struct snd_pcm *pcm;270 struct snd_pcm_substream *ss;271 unsigned int i;272 int err;273 274 err = snd_pcm_new(card, card->driver, 0, 0, max_channels(dev), &pcm);275 if (err < 0)276 return err;277 278 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &tw686x_pcm_ops);279 snd_pcm_chip(pcm) = dev;280 pcm->info_flags = 0;281 strscpy(pcm->name, "tw686x PCM", sizeof(pcm->name));282 283 for (i = 0, ss = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;284 ss; ss = ss->next, i++)285 snprintf(ss->name, sizeof(ss->name), "vch%u audio", i);286 287 snd_pcm_set_managed_buffer_all(pcm,288 SNDRV_DMA_TYPE_DEV,289 &dev->pci_dev->dev,290 TW686X_AUDIO_PAGE_MAX * AUDIO_DMA_SIZE_MAX,291 TW686X_AUDIO_PAGE_MAX * AUDIO_DMA_SIZE_MAX);292 return 0;293}294 295static void tw686x_audio_dma_free(struct tw686x_dev *dev,296 struct tw686x_audio_channel *ac)297{298 int pb;299 300 for (pb = 0; pb < 2; pb++) {301 if (!ac->dma_descs[pb].virt)302 continue;303 dma_free_coherent(&dev->pci_dev->dev, ac->dma_descs[pb].size,304 ac->dma_descs[pb].virt,305 ac->dma_descs[pb].phys);306 ac->dma_descs[pb].virt = NULL;307 }308}309 310static int tw686x_audio_dma_alloc(struct tw686x_dev *dev,311 struct tw686x_audio_channel *ac)312{313 int pb;314 315 /*316 * In the memcpy DMA mode we allocate a coherent buffer317 * and use it for the DMA capture. Otherwise, DMA318 * acts on the ALSA buffers as received in pcm_prepare.319 */320 if (dev->dma_mode != TW686X_DMA_MODE_MEMCPY)321 return 0;322 323 for (pb = 0; pb < 2; pb++) {324 u32 reg = pb ? ADMA_B_ADDR[ac->ch] : ADMA_P_ADDR[ac->ch];325 void *virt;326 327 virt = dma_alloc_coherent(&dev->pci_dev->dev,328 AUDIO_DMA_SIZE_MAX,329 &ac->dma_descs[pb].phys, GFP_KERNEL);330 if (!virt) {331 dev_err(&dev->pci_dev->dev,332 "dma%d: unable to allocate audio DMA %s-buffer\n",333 ac->ch, pb ? "B" : "P");334 return -ENOMEM;335 }336 ac->dma_descs[pb].virt = virt;337 ac->dma_descs[pb].size = AUDIO_DMA_SIZE_MAX;338 reg_write(dev, reg, ac->dma_descs[pb].phys);339 }340 return 0;341}342 343void tw686x_audio_free(struct tw686x_dev *dev)344{345 unsigned long flags;346 u32 dma_ch_mask;347 u32 dma_cmd;348 349 spin_lock_irqsave(&dev->lock, flags);350 dma_cmd = reg_read(dev, DMA_CMD);351 dma_ch_mask = reg_read(dev, DMA_CHANNEL_ENABLE);352 reg_write(dev, DMA_CMD, dma_cmd & ~0xff00);353 reg_write(dev, DMA_CHANNEL_ENABLE, dma_ch_mask & ~0xff00);354 spin_unlock_irqrestore(&dev->lock, flags);355 356 if (!dev->snd_card)357 return;358 snd_card_free(dev->snd_card);359 dev->snd_card = NULL;360}361 362int tw686x_audio_init(struct tw686x_dev *dev)363{364 struct pci_dev *pci_dev = dev->pci_dev;365 struct snd_card *card;366 int err, ch;367 368 /* Enable external audio */369 reg_write(dev, AUDIO_CONTROL1, BIT(0));370 371 err = snd_card_new(&pci_dev->dev, SNDRV_DEFAULT_IDX1,372 SNDRV_DEFAULT_STR1,373 THIS_MODULE, 0, &card);374 if (err < 0)375 return err;376 377 dev->snd_card = card;378 strscpy(card->driver, "tw686x", sizeof(card->driver));379 strscpy(card->shortname, "tw686x", sizeof(card->shortname));380 strscpy(card->longname, pci_name(pci_dev), sizeof(card->longname));381 snd_card_set_dev(card, &pci_dev->dev);382 383 for (ch = 0; ch < max_channels(dev); ch++) {384 struct tw686x_audio_channel *ac;385 386 ac = &dev->audio_channels[ch];387 spin_lock_init(&ac->lock);388 ac->dev = dev;389 ac->ch = ch;390 391 err = tw686x_audio_dma_alloc(dev, ac);392 if (err < 0)393 goto err_cleanup;394 }395 396 err = tw686x_snd_pcm_init(dev);397 if (err < 0)398 goto err_cleanup;399 400 err = snd_card_register(card);401 if (!err)402 return 0;403 404err_cleanup:405 for (ch = 0; ch < max_channels(dev); ch++) {406 if (!dev->audio_channels[ch].dev)407 continue;408 tw686x_audio_dma_free(dev, &dev->audio_channels[ch]);409 }410 snd_card_free(card);411 dev->snd_card = NULL;412 return err;413}414