1 // SPDX-License-Identifier: GPL-2.0+
2 // imx-pcm-fiq.c  --  ALSA Soc Audio Layer
6 // This code is based on code copyrighted by Freescale,
12 #include <linux/dma-mapping.h>
26 #include <asm/fiq.h>
28 #include <linux/platform_data/asoc-imx-ssi.h>
30 #include "imx-ssi.h"
31 #include "imx-pcm.h"
48 	struct snd_pcm_substream *substream = iprtd->substream;  in snd_hrtimer_callback()
51 	if (!atomic_read(&iprtd->playing) && !atomic_read(&iprtd->capturing))  in snd_hrtimer_callback()
56 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)  in snd_hrtimer_callback()
57 		iprtd->offset = regs.ARM_r8 & 0xffff;  in snd_hrtimer_callback()
59 		iprtd->offset = regs.ARM_r9 & 0xffff;  in snd_hrtimer_callback()
63 	hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns));  in snd_hrtimer_callback()
76 	struct snd_pcm_runtime *runtime = substream->runtime;  in snd_imx_pcm_hw_params()
77 	struct imx_pcm_runtime_data *iprtd = runtime->private_data;  in snd_imx_pcm_hw_params()
79 	iprtd->periods = params_periods(params);  in snd_imx_pcm_hw_params()
80 	iprtd->period = params_period_bytes(params);  in snd_imx_pcm_hw_params()
81 	iprtd->offset = 0;  in snd_imx_pcm_hw_params()
82 	iprtd->poll_time_ns = 1000000000 / params_rate(params) *  in snd_imx_pcm_hw_params()
91 	struct snd_pcm_runtime *runtime = substream->runtime;  in snd_imx_pcm_prepare()
92 	struct imx_pcm_runtime_data *iprtd = runtime->private_data;  in snd_imx_pcm_prepare()
96 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)  in snd_imx_pcm_prepare()
97 		regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;  in snd_imx_pcm_prepare()
99 		regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;  in snd_imx_pcm_prepare()
111 	struct snd_pcm_runtime *runtime = substream->runtime;  in snd_imx_pcm_trigger()
112 	struct imx_pcm_runtime_data *iprtd = runtime->private_data;  in snd_imx_pcm_trigger()
118 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)  in snd_imx_pcm_trigger()
119 			atomic_set(&iprtd->playing, 1);  in snd_imx_pcm_trigger()
121 			atomic_set(&iprtd->capturing, 1);  in snd_imx_pcm_trigger()
122 		hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns),  in snd_imx_pcm_trigger()
130 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)  in snd_imx_pcm_trigger()
131 			atomic_set(&iprtd->playing, 0);  in snd_imx_pcm_trigger()
133 			atomic_set(&iprtd->capturing, 0);  in snd_imx_pcm_trigger()
134 		if (!atomic_read(&iprtd->playing) &&  in snd_imx_pcm_trigger()
135 				!atomic_read(&iprtd->capturing))  in snd_imx_pcm_trigger()
140 		return -EINVAL;  in snd_imx_pcm_trigger()
150 	struct snd_pcm_runtime *runtime = substream->runtime;  in snd_imx_pcm_pointer()
151 	struct imx_pcm_runtime_data *iprtd = runtime->private_data;  in snd_imx_pcm_pointer()
153 	return bytes_to_frames(substream->runtime, iprtd->offset);  in snd_imx_pcm_pointer()
175 	struct snd_pcm_runtime *runtime = substream->runtime;  in snd_imx_open()
181 		return -ENOMEM;  in snd_imx_open()
182 	runtime->private_data = iprtd;  in snd_imx_open()
184 	iprtd->substream = substream;  in snd_imx_open()
186 	atomic_set(&iprtd->playing, 0);  in snd_imx_open()
187 	atomic_set(&iprtd->capturing, 0);  in snd_imx_open()
188 	hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);  in snd_imx_open()
189 	iprtd->hrt.function = snd_hrtimer_callback;  in snd_imx_open()
191 	ret = snd_pcm_hw_constraint_integer(substream->runtime,  in snd_imx_open()
205 	struct snd_pcm_runtime *runtime = substream->runtime;  in snd_imx_close()
206 	struct imx_pcm_runtime_data *iprtd = runtime->private_data;  in snd_imx_close()
208 	hrtimer_cancel(&iprtd->hrt);  in snd_imx_close()
217 	struct snd_card *card = rtd->card->snd_card;  in imx_pcm_new()
218 	struct snd_pcm *pcm = rtd->pcm;  in imx_pcm_new()
221 	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));  in imx_pcm_new()
226 					    pcm->card->dev,  in imx_pcm_new()
235 	struct snd_pcm *pcm = rtd->pcm;  in snd_imx_pcm_new()
243 	substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;  in snd_imx_pcm_new()
245 		struct snd_dma_buffer *buf = &substream->dma_buffer;  in snd_imx_pcm_new()
247 		imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;  in snd_imx_pcm_new()
250 	substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;  in snd_imx_pcm_new()
252 		struct snd_dma_buffer *buf = &substream->dma_buffer;  in snd_imx_pcm_new()
254 		imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;  in snd_imx_pcm_new()
258 		&imx_ssi_fiq_end - &imx_ssi_fiq_start);  in snd_imx_pcm_new()
288 		dev_err(&pdev->dev, "failed to claim fiq: %d", ret);  in imx_pcm_fiq_init()
292 	mxc_set_irq_fiq(params->irq, 1);  in imx_pcm_fiq_init()
293 	ssi_irq = params->irq;  in imx_pcm_fiq_init()
295 	imx_pcm_fiq = params->irq;  in imx_pcm_fiq_init()
297 	imx_ssi_fiq_base = (unsigned long)params->base;  in imx_pcm_fiq_init()
299 	params->dma_params_tx->maxburst = 4;  in imx_pcm_fiq_init()
300 	params->dma_params_rx->maxburst = 6;  in imx_pcm_fiq_init()
302 	ret = devm_snd_soc_register_component(&pdev->dev, &imx_soc_component_fiq,  in imx_pcm_fiq_init()
322 MODULE_DESCRIPTION("Freescale i.MX PCM FIQ handler");