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-rw-r--r--sound/soc/fsl/imx-pcm-fiq.c322
1 files changed, 322 insertions, 0 deletions
diff --git a/sound/soc/fsl/imx-pcm-fiq.c b/sound/soc/fsl/imx-pcm-fiq.c
new file mode 100644
index 0000000000..0d12400267
--- /dev/null
+++ b/sound/soc/fsl/imx-pcm-fiq.c
@@ -0,0 +1,322 @@
+// SPDX-License-Identifier: GPL-2.0+
+// imx-pcm-fiq.c -- ALSA Soc Audio Layer
+//
+// Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
+//
+// This code is based on code copyrighted by Freescale,
+// Liam Girdwood, Javier Martin and probably others.
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <sound/core.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/initval.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include <asm/fiq.h>
+
+#include <linux/platform_data/asoc-imx-ssi.h>
+
+#include "imx-ssi.h"
+#include "imx-pcm.h"
+
+struct imx_pcm_runtime_data {
+ unsigned int period;
+ int periods;
+ unsigned long offset;
+ struct hrtimer hrt;
+ int poll_time_ns;
+ struct snd_pcm_substream *substream;
+ atomic_t playing;
+ atomic_t capturing;
+};
+
+static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt)
+{
+ struct imx_pcm_runtime_data *iprtd =
+ container_of(hrt, struct imx_pcm_runtime_data, hrt);
+ struct snd_pcm_substream *substream = iprtd->substream;
+ struct pt_regs regs;
+
+ if (!atomic_read(&iprtd->playing) && !atomic_read(&iprtd->capturing))
+ return HRTIMER_NORESTART;
+
+ get_fiq_regs(&regs);
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ iprtd->offset = regs.ARM_r8 & 0xffff;
+ else
+ iprtd->offset = regs.ARM_r9 & 0xffff;
+
+ snd_pcm_period_elapsed(substream);
+
+ hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns));
+
+ return HRTIMER_RESTART;
+}
+
+static struct fiq_handler fh = {
+ .name = DRV_NAME,
+};
+
+static int snd_imx_pcm_hw_params(struct snd_soc_component *component,
+ struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct imx_pcm_runtime_data *iprtd = runtime->private_data;
+
+ iprtd->periods = params_periods(params);
+ iprtd->period = params_period_bytes(params);
+ iprtd->offset = 0;
+ iprtd->poll_time_ns = 1000000000 / params_rate(params) *
+ params_period_size(params);
+
+ return 0;
+}
+
+static int snd_imx_pcm_prepare(struct snd_soc_component *component,
+ struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct imx_pcm_runtime_data *iprtd = runtime->private_data;
+ struct pt_regs regs;
+
+ get_fiq_regs(&regs);
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
+ else
+ regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;
+
+ set_fiq_regs(&regs);
+
+ return 0;
+}
+
+static int imx_pcm_fiq;
+
+static int snd_imx_pcm_trigger(struct snd_soc_component *component,
+ struct snd_pcm_substream *substream, int cmd)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct imx_pcm_runtime_data *iprtd = runtime->private_data;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ atomic_set(&iprtd->playing, 1);
+ else
+ atomic_set(&iprtd->capturing, 1);
+ hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns),
+ HRTIMER_MODE_REL);
+ enable_fiq(imx_pcm_fiq);
+ break;
+
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ atomic_set(&iprtd->playing, 0);
+ else
+ atomic_set(&iprtd->capturing, 0);
+ if (!atomic_read(&iprtd->playing) &&
+ !atomic_read(&iprtd->capturing))
+ disable_fiq(imx_pcm_fiq);
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static snd_pcm_uframes_t
+snd_imx_pcm_pointer(struct snd_soc_component *component,
+ struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct imx_pcm_runtime_data *iprtd = runtime->private_data;
+
+ return bytes_to_frames(substream->runtime, iprtd->offset);
+}
+
+static const struct snd_pcm_hardware snd_imx_hardware = {
+ .info = SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_BLOCK_TRANSFER |
+ SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_MMAP_VALID |
+ SNDRV_PCM_INFO_PAUSE |
+ SNDRV_PCM_INFO_RESUME,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,
+ .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
+ .period_bytes_min = 128,
+ .period_bytes_max = 16 * 1024,
+ .periods_min = 4,
+ .periods_max = 255,
+ .fifo_size = 0,
+};
+
+static int snd_imx_open(struct snd_soc_component *component,
+ struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct imx_pcm_runtime_data *iprtd;
+ int ret;
+
+ iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
+ if (iprtd == NULL)
+ return -ENOMEM;
+ runtime->private_data = iprtd;
+
+ iprtd->substream = substream;
+
+ atomic_set(&iprtd->playing, 0);
+ atomic_set(&iprtd->capturing, 0);
+ hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ iprtd->hrt.function = snd_hrtimer_callback;
+
+ ret = snd_pcm_hw_constraint_integer(substream->runtime,
+ SNDRV_PCM_HW_PARAM_PERIODS);
+ if (ret < 0) {
+ kfree(iprtd);
+ return ret;
+ }
+
+ snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
+ return 0;
+}
+
+static int snd_imx_close(struct snd_soc_component *component,
+ struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct imx_pcm_runtime_data *iprtd = runtime->private_data;
+
+ hrtimer_cancel(&iprtd->hrt);
+
+ kfree(iprtd);
+
+ return 0;
+}
+
+static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd)
+{
+ struct snd_card *card = rtd->card->snd_card;
+ struct snd_pcm *pcm = rtd->pcm;
+ int ret;
+
+ ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
+ if (ret)
+ return ret;
+
+ return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV_WC,
+ pcm->card->dev,
+ IMX_SSI_DMABUF_SIZE);
+}
+
+static int ssi_irq;
+
+static int snd_imx_pcm_new(struct snd_soc_component *component,
+ struct snd_soc_pcm_runtime *rtd)
+{
+ struct snd_pcm *pcm = rtd->pcm;
+ struct snd_pcm_substream *substream;
+ int ret;
+
+ ret = imx_pcm_new(rtd);
+ if (ret)
+ return ret;
+
+ substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
+ if (substream) {
+ struct snd_dma_buffer *buf = &substream->dma_buffer;
+
+ imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
+ }
+
+ substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
+ if (substream) {
+ struct snd_dma_buffer *buf = &substream->dma_buffer;
+
+ imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
+ }
+
+ set_fiq_handler(&imx_ssi_fiq_start,
+ &imx_ssi_fiq_end - &imx_ssi_fiq_start);
+
+ return 0;
+}
+
+static void snd_imx_pcm_free(struct snd_soc_component *component,
+ struct snd_pcm *pcm)
+{
+ mxc_set_irq_fiq(ssi_irq, 0);
+ release_fiq(&fh);
+}
+
+static const struct snd_soc_component_driver imx_soc_component_fiq = {
+ .open = snd_imx_open,
+ .close = snd_imx_close,
+ .hw_params = snd_imx_pcm_hw_params,
+ .prepare = snd_imx_pcm_prepare,
+ .trigger = snd_imx_pcm_trigger,
+ .pointer = snd_imx_pcm_pointer,
+ .pcm_construct = snd_imx_pcm_new,
+ .pcm_destruct = snd_imx_pcm_free,
+};
+
+int imx_pcm_fiq_init(struct platform_device *pdev,
+ struct imx_pcm_fiq_params *params)
+{
+ int ret;
+
+ ret = claim_fiq(&fh);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
+ return ret;
+ }
+
+ mxc_set_irq_fiq(params->irq, 1);
+ ssi_irq = params->irq;
+
+ imx_pcm_fiq = params->irq;
+
+ imx_ssi_fiq_base = (unsigned long)params->base;
+
+ params->dma_params_tx->maxburst = 4;
+ params->dma_params_rx->maxburst = 6;
+
+ ret = devm_snd_soc_register_component(&pdev->dev, &imx_soc_component_fiq,
+ NULL, 0);
+ if (ret)
+ goto failed_register;
+
+ return 0;
+
+failed_register:
+ mxc_set_irq_fiq(ssi_irq, 0);
+ release_fiq(&fh);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(imx_pcm_fiq_init);
+
+void imx_pcm_fiq_exit(struct platform_device *pdev)
+{
+}
+EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit);
+
+MODULE_LICENSE("GPL");