From patchwork Wed Sep 12 11:47:07 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Ujfalusi X-Patchwork-Id: 1443001 Return-Path: X-Original-To: patchwork-linux-omap@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 9B9BC3FE79 for ; Wed, 12 Sep 2012 11:47:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757195Ab2ILLrg (ORCPT ); Wed, 12 Sep 2012 07:47:36 -0400 Received: from na3sys009aog117.obsmtp.com ([74.125.149.242]:36666 "EHLO na3sys009aog117.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754590Ab2ILLrQ (ORCPT ); Wed, 12 Sep 2012 07:47:16 -0400 Received: from mail-ob0-f174.google.com ([209.85.214.174]) (using TLSv1) by na3sys009aob117.postini.com ([74.125.148.12]) with SMTP ID DSNKUFB2ROHaX7Ntgs4fGU2RPRL3a3YFdgrY@postini.com; Wed, 12 Sep 2012 04:47:16 PDT Received: by obbuo13 with SMTP id uo13so2442741obb.19 for ; Wed, 12 Sep 2012 04:47:15 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references :x-gm-message-state; bh=TFZxwbJAR5aF3yby/E27apDV70TYQ6Kf0SQRcBe06+s=; b=imbKNi5WUd+ZtYk/b1ORASsGOAQpsDh84WYRhpDpiEw0FxiucNCDl/Ra/KOTRcJUNx upyigGNBaaaaG5B9QGPrGRnbW1bQvCJcIZ1TkSrNb4UEXoO1TD2NVa5fNXsiHgzBl6Vs hCLwEF3PnDzTcB2z9hOEE5x/EOyhNqNl6gMjYtkMYj8G78rc+DvIHpOayWE+1M114ttF Iwhw48VLVMxmWIafmerzbqj16y23QCo6eb65lUJav+3QY2TrqsdABVfb3fkrjoM2LFNG G7Qypfes3bvGoTbVSDSi1v0oyCgq6GIIi+4HgEuIR/12oJvQNhYV1W9d2nt3r1s7ipTW U2qg== Received: by 10.182.116.2 with SMTP id js2mr21813975obb.38.1347450435472; Wed, 12 Sep 2012 04:47:15 -0700 (PDT) Received: from barack.emea.dhcp.ti.com (dragon.ti.com. [192.94.94.33]) by mx.google.com with ESMTPS id c6sm19835570obd.22.2012.09.12.04.47.12 (version=SSLv3 cipher=OTHER); Wed, 12 Sep 2012 04:47:14 -0700 (PDT) From: Peter Ujfalusi To: Mark Brown , Liam Girdwood , Tony Lindgren , Russell King , Vinod Koul , Dan Williams , Jarkko Nikula Cc: alsa-devel@alsa-project.org, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Janusz Krzysztofik , Ricardo Neri Subject: [PATCH 11/11] ASoC: omap-pcm: Convert to use dmaengine Date: Wed, 12 Sep 2012 14:47:07 +0300 Message-Id: <1347450427-27627-12-git-send-email-peter.ujfalusi@ti.com> X-Mailer: git-send-email 1.7.12 In-Reply-To: <1347450427-27627-1-git-send-email-peter.ujfalusi@ti.com> References: <1347450427-27627-1-git-send-email-peter.ujfalusi@ti.com> X-Gm-Message-State: ALoCoQlDy0FTGLEo23U2hpYnwQHmH8Xf8FW6btpmyCO6Gfs7QvOKaOSni8V9u+ghkMMHuE70/UC4 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org Original author: Russell King Switch the omap-pcm to use dmaengine. Certain features are not supported by after dmaengine conversion: 1. No period wakeup mode DMA engine has no way to communicate this information through standard channels. 2. Pause/Resume OMAP DMA engine backend does not support pausing and resuming an in-progress transfer. It is unclear from the specs what effect clearing the enable bit has on the DMA position of a destination synchronized transfer, and whether the transfer can be restarted from the exact point that it was paused (or whether the data in the FIFO read from memory is simply discarded.) Signed-off-by: Peter Ujfalusi CC: Russell King --- sound/soc/omap/Kconfig | 3 +- sound/soc/omap/omap-pcm.c | 279 +++++++++++----------------------------------- 2 files changed, 67 insertions(+), 215 deletions(-) diff --git a/sound/soc/omap/Kconfig b/sound/soc/omap/Kconfig index 2c484a5..7048137 100644 --- a/sound/soc/omap/Kconfig +++ b/sound/soc/omap/Kconfig @@ -1,6 +1,7 @@ config SND_OMAP_SOC tristate "SoC Audio for the Texas Instruments OMAP chips" - depends on ARCH_OMAP + depends on ARCH_OMAP && DMA_OMAP + select SND_SOC_DMAENGINE_PCM config SND_OMAP_SOC_DMIC tristate diff --git a/sound/soc/omap/omap-pcm.c b/sound/soc/omap/omap-pcm.c index 74da4b7..eb68c9e 100644 --- a/sound/soc/omap/omap-pcm.c +++ b/sound/soc/omap/omap-pcm.c @@ -25,21 +25,24 @@ #include #include #include +#include #include #include #include +#include #include -#include #include "omap-pcm.h" static const struct snd_pcm_hardware omap_pcm_hardware = { .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | - SNDRV_PCM_INFO_INTERLEAVED | - SNDRV_PCM_INFO_PAUSE | - SNDRV_PCM_INFO_RESUME | - SNDRV_PCM_INFO_NO_PERIOD_WAKEUP, + SNDRV_PCM_INFO_INTERLEAVED, + /* + * TODO: support for + * SNDRV_PCM_INFO_NO_PERIOD_WAKEUP + * via dmaengine. + */ .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE, .period_bytes_min = 32, @@ -49,61 +52,34 @@ static const struct snd_pcm_hardware omap_pcm_hardware = { .buffer_bytes_max = 128 * 1024, }; -struct omap_runtime_data { - spinlock_t lock; - struct omap_pcm_dma_data *dma_data; - int dma_ch; - int period_index; -}; - -static void omap_pcm_dma_irq(int ch, u16 stat, void *data) +static int omap_pcm_get_dma_buswidth(int num_bits) { - struct snd_pcm_substream *substream = data; - struct snd_pcm_runtime *runtime = substream->runtime; - struct omap_runtime_data *prtd = runtime->private_data; - unsigned long flags; - - if ((cpu_is_omap1510())) { - /* - * OMAP1510 doesn't fully support DMA progress counter - * and there is no software emulation implemented yet, - * so have to maintain our own progress counters - * that can be used by omap_pcm_pointer() instead. - */ - spin_lock_irqsave(&prtd->lock, flags); - if ((stat == OMAP_DMA_LAST_IRQ) && - (prtd->period_index == runtime->periods - 1)) { - /* we are in sync, do nothing */ - spin_unlock_irqrestore(&prtd->lock, flags); - return; - } - if (prtd->period_index >= 0) { - if (stat & OMAP_DMA_BLOCK_IRQ) { - /* end of buffer reached, loop back */ - prtd->period_index = 0; - } else if (stat & OMAP_DMA_LAST_IRQ) { - /* update the counter for the last period */ - prtd->period_index = runtime->periods - 1; - } else if (++prtd->period_index >= runtime->periods) { - /* end of buffer missed? loop back */ - prtd->period_index = 0; - } - } - spin_unlock_irqrestore(&prtd->lock, flags); - } + int buswidth; - snd_pcm_period_elapsed(substream); + switch (num_bits) { + case 16: + buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES; + break; + case 32: + buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES; + break; + default: + buswidth = -EINVAL; + break; + } + return buswidth; } + /* this may get called several times by oss emulation */ static int omap_pcm_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { struct snd_pcm_runtime *runtime = substream->runtime; struct snd_soc_pcm_runtime *rtd = substream->private_data; - struct omap_runtime_data *prtd = runtime->private_data; struct omap_pcm_dma_data *dma_data; - + struct dma_slave_config config; + struct dma_chan *chan; int err = 0; dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); @@ -116,195 +92,78 @@ static int omap_pcm_hw_params(struct snd_pcm_substream *substream, snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); runtime->dma_bytes = params_buffer_bytes(params); - if (prtd->dma_data) - return 0; - prtd->dma_data = dma_data; - err = omap_request_dma(dma_data->dma_req, dma_data->name, - omap_pcm_dma_irq, substream, &prtd->dma_ch); - if (!err) { - /* - * Link channel with itself so DMA doesn't need any - * reprogramming while looping the buffer - */ - omap_dma_link_lch(prtd->dma_ch, prtd->dma_ch); - } - - return err; -} - -static int omap_pcm_hw_free(struct snd_pcm_substream *substream) -{ - struct snd_pcm_runtime *runtime = substream->runtime; - struct omap_runtime_data *prtd = runtime->private_data; - - if (prtd->dma_data == NULL) - return 0; + chan = snd_dmaengine_pcm_get_chan(substream); + if (!chan) + return -EINVAL; - omap_dma_unlink_lch(prtd->dma_ch, prtd->dma_ch); - omap_free_dma(prtd->dma_ch); - prtd->dma_data = NULL; + /* fills in addr_width and direction */ + err = snd_hwparams_to_dma_slave_config(substream, params, &config); + if (err) + return err; - snd_pcm_set_runtime_buffer(substream, NULL); + /* Override the *_dma addr_width if requested by the DAI driver */ + if (dma_data->data_type) { + int buswidth = omap_pcm_get_dma_buswidth(dma_data->data_type); - return 0; -} + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) + config.dst_addr_width = buswidth; + else + config.src_addr_width = buswidth; + } -static int omap_pcm_get_dma_type(int num_bits) -{ - int data_type; + config.src_addr = dma_data->port_addr; + config.dst_addr = dma_data->port_addr; + config.src_maxburst = dma_data->packet_size; + config.dst_maxburst = dma_data->packet_size; - switch (num_bits) { - case 16: - data_type = OMAP_DMA_DATA_TYPE_S16; - break; - case 32: - data_type = OMAP_DMA_DATA_TYPE_S32; - break; - default: - data_type = -EINVAL; - break; - } - return data_type; + return dmaengine_slave_config(chan, &config); } -static int omap_pcm_prepare(struct snd_pcm_substream *substream) +static int omap_pcm_hw_free(struct snd_pcm_substream *substream) { - struct snd_pcm_runtime *runtime = substream->runtime; - struct omap_runtime_data *prtd = runtime->private_data; - struct omap_pcm_dma_data *dma_data = prtd->dma_data; - struct omap_dma_channel_params dma_params; - int bytes; - - /* return if this is a bufferless transfer e.g. - * codec <--> BT codec or GSM modem -- lg FIXME */ - if (!prtd->dma_data) - return 0; - - memset(&dma_params, 0, sizeof(dma_params)); - - if (dma_data->data_type) - dma_params.data_type = omap_pcm_get_dma_type( - dma_data->data_type); - else - dma_params.data_type = omap_pcm_get_dma_type( - snd_pcm_format_physical_width(runtime->format)); - - if (dma_params.data_type < 0) - return dma_params.data_type; - - dma_params.trigger = dma_data->dma_req; - - if (dma_data->packet_size) - dma_params.sync_mode = OMAP_DMA_SYNC_PACKET; - else - dma_params.sync_mode = OMAP_DMA_SYNC_ELEMENT; - - if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { - dma_params.src_amode = OMAP_DMA_AMODE_POST_INC; - dma_params.dst_amode = OMAP_DMA_AMODE_CONSTANT; - dma_params.src_or_dst_synch = OMAP_DMA_DST_SYNC; - dma_params.src_start = runtime->dma_addr; - dma_params.dst_start = dma_data->port_addr; - dma_params.dst_port = OMAP_DMA_PORT_MPUI; - dma_params.dst_fi = dma_data->packet_size; - } else { - dma_params.src_amode = OMAP_DMA_AMODE_CONSTANT; - dma_params.dst_amode = OMAP_DMA_AMODE_POST_INC; - dma_params.src_or_dst_synch = OMAP_DMA_SRC_SYNC; - dma_params.src_start = dma_data->port_addr; - dma_params.dst_start = runtime->dma_addr; - dma_params.src_port = OMAP_DMA_PORT_MPUI; - dma_params.src_fi = dma_data->packet_size; - } - /* - * Set DMA transfer frame size equal to ALSA period size and frame - * count as no. of ALSA periods. Then with DMA frame interrupt enabled, - * we can transfer the whole ALSA buffer with single DMA transfer but - * still can get an interrupt at each period bounary - */ - bytes = snd_pcm_lib_period_bytes(substream); - dma_params.elem_count = bytes >> dma_params.data_type; - dma_params.frame_count = runtime->periods; - omap_set_dma_params(prtd->dma_ch, &dma_params); - - if ((cpu_is_omap1510())) - omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ | - OMAP_DMA_LAST_IRQ | OMAP_DMA_BLOCK_IRQ); - else if (!substream->runtime->no_period_wakeup) - omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ); - else { - /* - * No period wakeup: - * we need to disable BLOCK_IRQ, which is enabled by the omap - * dma core at request dma time. - */ - omap_disable_dma_irq(prtd->dma_ch, OMAP_DMA_BLOCK_IRQ); - } - - if (!(cpu_class_is_omap1())) { - omap_set_dma_src_burst_mode(prtd->dma_ch, - OMAP_DMA_DATA_BURST_16); - omap_set_dma_dest_burst_mode(prtd->dma_ch, - OMAP_DMA_DATA_BURST_16); - } - + snd_pcm_set_runtime_buffer(substream, NULL); return 0; } static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd) { - struct snd_pcm_runtime *runtime = substream->runtime; - struct omap_runtime_data *prtd = runtime->private_data; - struct omap_pcm_dma_data *dma_data = prtd->dma_data; - unsigned long flags; + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct omap_pcm_dma_data *dma_data; int ret = 0; - spin_lock_irqsave(&prtd->lock, flags); + dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); + switch (cmd) { case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: - prtd->period_index = 0; /* Configure McBSP internal buffer usage */ if (dma_data->set_threshold) dma_data->set_threshold(substream); - - omap_start_dma(prtd->dma_ch); break; case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_SUSPEND: case SNDRV_PCM_TRIGGER_PAUSE_PUSH: - prtd->period_index = -1; - omap_stop_dma(prtd->dma_ch); break; default: ret = -EINVAL; } - spin_unlock_irqrestore(&prtd->lock, flags); + + if (ret == 0) + ret = snd_dmaengine_pcm_trigger(substream, cmd); return ret; } static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream) { - struct snd_pcm_runtime *runtime = substream->runtime; - struct omap_runtime_data *prtd = runtime->private_data; - dma_addr_t ptr; snd_pcm_uframes_t offset; - if (cpu_is_omap1510()) { - offset = prtd->period_index * runtime->period_size; - } else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { - ptr = omap_get_dma_dst_pos(prtd->dma_ch); - offset = bytes_to_frames(runtime, ptr - runtime->dma_addr); - } else { - ptr = omap_get_dma_src_pos(prtd->dma_ch); - offset = bytes_to_frames(runtime, ptr - runtime->dma_addr); - } - - if (offset >= runtime->buffer_size) - offset = 0; + if (cpu_is_omap1510()) + offset = snd_dmaengine_pcm_pointer_no_residue(substream); + else + offset = snd_dmaengine_pcm_pointer(substream); return offset; } @@ -312,7 +171,8 @@ static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream) static int omap_pcm_open(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; - struct omap_runtime_data *prtd; + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct omap_pcm_dma_data *dma_data; int ret; snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware); @@ -321,25 +181,17 @@ static int omap_pcm_open(struct snd_pcm_substream *substream) ret = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); if (ret < 0) - goto out; - - prtd = kzalloc(sizeof(*prtd), GFP_KERNEL); - if (prtd == NULL) { - ret = -ENOMEM; - goto out; - } - spin_lock_init(&prtd->lock); - runtime->private_data = prtd; + return ret; -out: + dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); + ret = snd_dmaengine_pcm_open(substream, omap_dma_filter_fn, + &dma_data->dma_req); return ret; } static int omap_pcm_close(struct snd_pcm_substream *substream) { - struct snd_pcm_runtime *runtime = substream->runtime; - - kfree(runtime->private_data); + snd_dmaengine_pcm_close(substream); return 0; } @@ -360,7 +212,6 @@ static struct snd_pcm_ops omap_pcm_ops = { .ioctl = snd_pcm_lib_ioctl, .hw_params = omap_pcm_hw_params, .hw_free = omap_pcm_hw_free, - .prepare = omap_pcm_prepare, .trigger = omap_pcm_trigger, .pointer = omap_pcm_pointer, .mmap = omap_pcm_mmap,