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1// SPDX-License-Identifier: GPL-2.0-or-later2// linux/sound/bcm/bcm63xx-pcm-whistler.c3// BCM63xx whistler pcm interface4// Copyright (c) 2020 Broadcom Corporation5// Author: Kevin-Ke Li <kevin-ke.li@broadcom.com>6 7#include <linux/dma-mapping.h>8#include <linux/io.h>9#include <linux/irq.h>10#include <linux/module.h>11#include <sound/pcm_params.h>12#include <linux/regmap.h>13#include <linux/of_device.h>14#include <sound/soc.h>15#include "bcm63xx-i2s.h"16 17 18struct i2s_dma_desc {19	unsigned char *dma_area;20	dma_addr_t dma_addr;21	unsigned int dma_len;22};23 24struct bcm63xx_runtime_data {25	int dma_len;26	dma_addr_t dma_addr;27	dma_addr_t dma_addr_next;28};29 30static const struct snd_pcm_hardware bcm63xx_pcm_hardware = {31	.info = SNDRV_PCM_INFO_MMAP |32		SNDRV_PCM_INFO_MMAP_VALID |33		SNDRV_PCM_INFO_INTERLEAVED |34		SNDRV_PCM_INFO_PAUSE |35		SNDRV_PCM_INFO_RESUME,36	.formats = SNDRV_PCM_FMTBIT_S32_LE, /* support S32 only */37	.period_bytes_max = 8192 - 32,38	.periods_min = 1,39	.periods_max = PAGE_SIZE/sizeof(struct i2s_dma_desc),40	.buffer_bytes_max = 128 * 1024,41	.fifo_size = 32,42};43 44static int bcm63xx_pcm_hw_params(struct snd_soc_component *component,45				 struct snd_pcm_substream *substream,46				 struct snd_pcm_hw_params *params)47{48	struct i2s_dma_desc *dma_desc;49	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);50 51	dma_desc = kzalloc(sizeof(*dma_desc), GFP_NOWAIT);52	if (!dma_desc)53		return -ENOMEM;54 55	snd_soc_dai_set_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream, dma_desc);56 57	return 0;58}59 60static int bcm63xx_pcm_hw_free(struct snd_soc_component *component,61			struct snd_pcm_substream *substream)62{63	struct i2s_dma_desc	*dma_desc;64	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);65 66	dma_desc = snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream);67	kfree(dma_desc);68 69	return 0;70}71 72static int bcm63xx_pcm_trigger(struct snd_soc_component *component,73			       struct snd_pcm_substream *substream, int cmd)74{75	int ret = 0;76	struct snd_soc_pcm_runtime *rtd;77	struct bcm_i2s_priv *i2s_priv;78	struct regmap   *regmap_i2s;79 80	rtd = snd_soc_substream_to_rtd(substream);81	i2s_priv = dev_get_drvdata(snd_soc_rtd_to_cpu(rtd, 0)->dev);82	regmap_i2s = i2s_priv->regmap_i2s;83 84	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {85		switch (cmd) {86		case SNDRV_PCM_TRIGGER_START:87			regmap_update_bits(regmap_i2s,88					   I2S_TX_IRQ_EN,89					   I2S_TX_DESC_OFF_INTR_EN,90					   I2S_TX_DESC_OFF_INTR_EN);91			regmap_update_bits(regmap_i2s,92					   I2S_TX_CFG,93					   I2S_TX_ENABLE_MASK,94					   I2S_TX_ENABLE);95			break;96		case SNDRV_PCM_TRIGGER_STOP:97		case SNDRV_PCM_TRIGGER_SUSPEND:98		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:99			regmap_write(regmap_i2s,100				     I2S_TX_IRQ_EN,101				     0);102			regmap_update_bits(regmap_i2s,103					   I2S_TX_CFG,104					   I2S_TX_ENABLE_MASK,105					   0);106			break;107		default:108			ret = -EINVAL;109		}110	} else {111		switch (cmd) {112		case SNDRV_PCM_TRIGGER_START:113			regmap_update_bits(regmap_i2s,114					   I2S_RX_IRQ_EN,115					   I2S_RX_DESC_OFF_INTR_EN_MSK,116					   I2S_RX_DESC_OFF_INTR_EN);117			regmap_update_bits(regmap_i2s,118					   I2S_RX_CFG,119					   I2S_RX_ENABLE_MASK,120					   I2S_RX_ENABLE);121			break;122		case SNDRV_PCM_TRIGGER_STOP:123		case SNDRV_PCM_TRIGGER_SUSPEND:124		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:125			regmap_update_bits(regmap_i2s,126					   I2S_RX_IRQ_EN,127					   I2S_RX_DESC_OFF_INTR_EN_MSK,128					   0);129			regmap_update_bits(regmap_i2s,130					   I2S_RX_CFG,131					   I2S_RX_ENABLE_MASK,132					   0);133			break;134		default:135			ret = -EINVAL;136		}137	}138	return ret;139}140 141static int bcm63xx_pcm_prepare(struct snd_soc_component *component,142			struct snd_pcm_substream *substream)143{144	struct i2s_dma_desc	*dma_desc;145	struct regmap		*regmap_i2s;146	struct bcm_i2s_priv	*i2s_priv;147	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);148	struct snd_pcm_runtime *runtime = substream->runtime;149	uint32_t regaddr_desclen, regaddr_descaddr;150 151	dma_desc = snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream);152	dma_desc->dma_len  = snd_pcm_lib_period_bytes(substream);153	dma_desc->dma_addr = runtime->dma_addr;154	dma_desc->dma_area = runtime->dma_area;155 156	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {157		regaddr_desclen = I2S_TX_DESC_IFF_LEN;158		regaddr_descaddr = I2S_TX_DESC_IFF_ADDR;159	} else {160		regaddr_desclen = I2S_RX_DESC_IFF_LEN;161		regaddr_descaddr = I2S_RX_DESC_IFF_ADDR;162	}163 164	i2s_priv = dev_get_drvdata(snd_soc_rtd_to_cpu(rtd, 0)->dev);165	regmap_i2s = i2s_priv->regmap_i2s;166 167	regmap_write(regmap_i2s, regaddr_desclen, dma_desc->dma_len);168	regmap_write(regmap_i2s, regaddr_descaddr, dma_desc->dma_addr);169 170	return 0;171}172 173static snd_pcm_uframes_t174bcm63xx_pcm_pointer(struct snd_soc_component *component,175		struct snd_pcm_substream *substream)176{177	snd_pcm_uframes_t x;178	struct bcm63xx_runtime_data *prtd = substream->runtime->private_data;179 180	if (!prtd->dma_addr_next)181		prtd->dma_addr_next = substream->runtime->dma_addr;182 183	x = bytes_to_frames(substream->runtime,184		prtd->dma_addr_next - substream->runtime->dma_addr);185 186	return x == substream->runtime->buffer_size ? 0 : x;187}188 189static int bcm63xx_pcm_open(struct snd_soc_component *component,190			struct snd_pcm_substream *substream)191{192	int ret = 0;193	struct snd_pcm_runtime *runtime = substream->runtime;194	struct bcm63xx_runtime_data *prtd;195 196	runtime->hw = bcm63xx_pcm_hardware;197	ret = snd_pcm_hw_constraint_step(runtime, 0,198					 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);199	if (ret)200		goto out;201 202	ret = snd_pcm_hw_constraint_step(runtime, 0,203					 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);204	if (ret)205		goto out;206 207	ret = snd_pcm_hw_constraint_integer(runtime,208					    SNDRV_PCM_HW_PARAM_PERIODS);209	if (ret < 0)210		goto out;211 212	ret = -ENOMEM;213	prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);214	if (!prtd)215		goto out;216 217	runtime->private_data = prtd;218	return 0;219out:220	return ret;221}222 223static int bcm63xx_pcm_close(struct snd_soc_component *component,224			struct snd_pcm_substream *substream)225{226	struct snd_pcm_runtime *runtime = substream->runtime;227	struct bcm63xx_runtime_data *prtd = runtime->private_data;228 229	kfree(prtd);230	return 0;231}232 233static irqreturn_t i2s_dma_isr(int irq, void *bcm_i2s_priv)234{235	unsigned int availdepth, ifflevel, offlevel, int_status, val_1, val_2;236	struct bcm63xx_runtime_data *prtd;237	struct snd_pcm_substream *substream;238	struct snd_pcm_runtime *runtime;239	struct regmap *regmap_i2s;240	struct i2s_dma_desc *dma_desc;241	struct snd_soc_pcm_runtime *rtd;242	struct bcm_i2s_priv *i2s_priv;243 244	i2s_priv = (struct bcm_i2s_priv *)bcm_i2s_priv;245	regmap_i2s = i2s_priv->regmap_i2s;246 247	/* rx */248	regmap_read(regmap_i2s, I2S_RX_IRQ_CTL, &int_status);249 250	if (int_status & I2S_RX_DESC_OFF_INTR_EN_MSK) {251		substream = i2s_priv->capture_substream;252		runtime = substream->runtime;253		rtd = snd_soc_substream_to_rtd(substream);254		prtd = runtime->private_data;255		dma_desc = snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream);256 257		offlevel = (int_status & I2S_RX_DESC_OFF_LEVEL_MASK) >>258			   I2S_RX_DESC_OFF_LEVEL_SHIFT;259		while (offlevel) {260			regmap_read(regmap_i2s, I2S_RX_DESC_OFF_ADDR, &val_1);261			regmap_read(regmap_i2s, I2S_RX_DESC_OFF_LEN, &val_2);262			offlevel--;263		}264		prtd->dma_addr_next = val_1 + val_2;265		ifflevel = (int_status & I2S_RX_DESC_IFF_LEVEL_MASK) >>266			   I2S_RX_DESC_IFF_LEVEL_SHIFT;267 268		availdepth = I2S_DESC_FIFO_DEPTH - ifflevel;269		while (availdepth) {270			dma_desc->dma_addr +=271					snd_pcm_lib_period_bytes(substream);272			dma_desc->dma_area +=273					snd_pcm_lib_period_bytes(substream);274			if (dma_desc->dma_addr - runtime->dma_addr >=275						runtime->dma_bytes) {276				dma_desc->dma_addr = runtime->dma_addr;277				dma_desc->dma_area = runtime->dma_area;278			}279 280			prtd->dma_addr = dma_desc->dma_addr;281			regmap_write(regmap_i2s, I2S_RX_DESC_IFF_LEN,282				     snd_pcm_lib_period_bytes(substream));283			regmap_write(regmap_i2s, I2S_RX_DESC_IFF_ADDR,284				     dma_desc->dma_addr);285			availdepth--;286		}287 288		snd_pcm_period_elapsed(substream);289 290		/* Clear interrupt by writing 0 */291		regmap_update_bits(regmap_i2s, I2S_RX_IRQ_CTL,292				   I2S_RX_INTR_MASK, 0);293	}294 295	/* tx */296	regmap_read(regmap_i2s, I2S_TX_IRQ_CTL, &int_status);297 298	if (int_status & I2S_TX_DESC_OFF_INTR_EN_MSK) {299		substream = i2s_priv->play_substream;300		runtime = substream->runtime;301		rtd = snd_soc_substream_to_rtd(substream);302		prtd = runtime->private_data;303		dma_desc = snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream);304 305		offlevel = (int_status & I2S_TX_DESC_OFF_LEVEL_MASK) >>306			   I2S_TX_DESC_OFF_LEVEL_SHIFT;307		while (offlevel) {308			regmap_read(regmap_i2s, I2S_TX_DESC_OFF_ADDR, &val_1);309			regmap_read(regmap_i2s, I2S_TX_DESC_OFF_LEN,  &val_2);310			prtd->dma_addr_next = val_1 + val_2;311			offlevel--;312		}313 314		ifflevel = (int_status & I2S_TX_DESC_IFF_LEVEL_MASK) >>315			I2S_TX_DESC_IFF_LEVEL_SHIFT;316		availdepth = I2S_DESC_FIFO_DEPTH - ifflevel;317 318		while (availdepth) {319			dma_desc->dma_addr +=320					snd_pcm_lib_period_bytes(substream);321			dma_desc->dma_area +=322					snd_pcm_lib_period_bytes(substream);323 324			if (dma_desc->dma_addr - runtime->dma_addr >=325							runtime->dma_bytes) {326				dma_desc->dma_addr = runtime->dma_addr;327				dma_desc->dma_area = runtime->dma_area;328			}329 330			prtd->dma_addr = dma_desc->dma_addr;331			regmap_write(regmap_i2s, I2S_TX_DESC_IFF_LEN,332				snd_pcm_lib_period_bytes(substream));333			regmap_write(regmap_i2s, I2S_TX_DESC_IFF_ADDR,334					dma_desc->dma_addr);335			availdepth--;336		}337 338		snd_pcm_period_elapsed(substream);339 340		/* Clear interrupt by writing 0 */341		regmap_update_bits(regmap_i2s, I2S_TX_IRQ_CTL,342				   I2S_TX_INTR_MASK, 0);343	}344 345	return IRQ_HANDLED;346}347 348static int bcm63xx_soc_pcm_new(struct snd_soc_component *component,349		struct snd_soc_pcm_runtime *rtd)350{351	struct snd_pcm *pcm = rtd->pcm;352	struct bcm_i2s_priv *i2s_priv;353	int ret;354 355	i2s_priv = dev_get_drvdata(snd_soc_rtd_to_cpu(rtd, 0)->dev);356 357	of_dma_configure(pcm->card->dev, pcm->card->dev->of_node, 1);358 359	ret = dma_coerce_mask_and_coherent(pcm->card->dev, DMA_BIT_MASK(32));360	if (ret)361		return ret;362 363	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)364		i2s_priv->play_substream =365			pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;366	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)367		i2s_priv->capture_substream =368			pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;369 370	return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV_WC,371					    pcm->card->dev,372					    bcm63xx_pcm_hardware.buffer_bytes_max);373}374 375static const struct snd_soc_component_driver bcm63xx_soc_platform = {376	.open = bcm63xx_pcm_open,377	.close = bcm63xx_pcm_close,378	.hw_params = bcm63xx_pcm_hw_params,379	.hw_free = bcm63xx_pcm_hw_free,380	.prepare = bcm63xx_pcm_prepare,381	.trigger = bcm63xx_pcm_trigger,382	.pointer = bcm63xx_pcm_pointer,383	.pcm_construct = bcm63xx_soc_pcm_new,384};385 386int bcm63xx_soc_platform_probe(struct platform_device *pdev,387			       struct bcm_i2s_priv *i2s_priv)388{389	int ret;390 391	ret = platform_get_irq(pdev, 0);392	if (ret < 0)393		return ret;394 395	ret = devm_request_irq(&pdev->dev, ret, i2s_dma_isr,396			       irq_get_trigger_type(ret), "i2s_dma", (void *)i2s_priv);397	if (ret) {398		dev_err(&pdev->dev,399			"i2s_init: failed to request interrupt.ret=%d\n", ret);400		return ret;401	}402 403	return devm_snd_soc_register_component(&pdev->dev,404					&bcm63xx_soc_platform, NULL, 0);405}406 407int bcm63xx_soc_platform_remove(struct platform_device *pdev)408{409	return 0;410}411 412MODULE_AUTHOR("Kevin,Li <kevin-ke.li@broadcom.com>");413MODULE_DESCRIPTION("Broadcom DSL XPON ASOC PCM Interface");414MODULE_LICENSE("GPL v2");415