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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) 2012-2013, Analog Devices Inc.4 * Author: Lars-Peter Clausen <lars@metafoo.de>5 */6 7#include <linux/clk.h>8#include <linux/init.h>9#include <linux/kernel.h>10#include <linux/module.h>11#include <linux/of.h>12#include <linux/platform_device.h>13#include <linux/regmap.h>14#include <linux/slab.h>15 16#include <sound/core.h>17#include <sound/pcm.h>18#include <sound/pcm_params.h>19#include <sound/soc.h>20#include <sound/dmaengine_pcm.h>21 22#define AXI_I2S_REG_RESET 0x0023#define AXI_I2S_REG_CTRL 0x0424#define AXI_I2S_REG_CLK_CTRL 0x0825#define AXI_I2S_REG_STATUS 0x1026 27#define AXI_I2S_REG_RX_FIFO 0x2828#define AXI_I2S_REG_TX_FIFO 0x2C29 30#define AXI_I2S_RESET_GLOBAL BIT(0)31#define AXI_I2S_RESET_TX_FIFO BIT(1)32#define AXI_I2S_RESET_RX_FIFO BIT(2)33 34#define AXI_I2S_CTRL_TX_EN BIT(0)35#define AXI_I2S_CTRL_RX_EN BIT(1)36 37/* The frame size is configurable, but for now we always set it 64 bit */38#define AXI_I2S_BITS_PER_FRAME 6439 40struct axi_i2s {41 struct regmap *regmap;42 struct clk *clk;43 struct clk *clk_ref;44 45 bool has_capture;46 bool has_playback;47 48 struct snd_soc_dai_driver dai_driver;49 50 struct snd_dmaengine_dai_dma_data capture_dma_data;51 struct snd_dmaengine_dai_dma_data playback_dma_data;52 53 struct snd_ratnum ratnum;54 struct snd_pcm_hw_constraint_ratnums rate_constraints;55};56 57static int axi_i2s_trigger(struct snd_pcm_substream *substream, int cmd,58 struct snd_soc_dai *dai)59{60 struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);61 unsigned int mask, val;62 63 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)64 mask = AXI_I2S_CTRL_RX_EN;65 else66 mask = AXI_I2S_CTRL_TX_EN;67 68 switch (cmd) {69 case SNDRV_PCM_TRIGGER_START:70 case SNDRV_PCM_TRIGGER_RESUME:71 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:72 val = mask;73 break;74 case SNDRV_PCM_TRIGGER_STOP:75 case SNDRV_PCM_TRIGGER_SUSPEND:76 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:77 val = 0;78 break;79 default:80 return -EINVAL;81 }82 83 regmap_update_bits(i2s->regmap, AXI_I2S_REG_CTRL, mask, val);84 85 return 0;86}87 88static int axi_i2s_hw_params(struct snd_pcm_substream *substream,89 struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)90{91 struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);92 unsigned int bclk_div, word_size;93 unsigned int bclk_rate;94 95 bclk_rate = params_rate(params) * AXI_I2S_BITS_PER_FRAME;96 97 word_size = AXI_I2S_BITS_PER_FRAME / 2 - 1;98 bclk_div = DIV_ROUND_UP(clk_get_rate(i2s->clk_ref), bclk_rate) / 2 - 1;99 100 regmap_write(i2s->regmap, AXI_I2S_REG_CLK_CTRL, (word_size << 16) |101 bclk_div);102 103 return 0;104}105 106static int axi_i2s_startup(struct snd_pcm_substream *substream,107 struct snd_soc_dai *dai)108{109 struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);110 uint32_t mask;111 int ret;112 113 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)114 mask = AXI_I2S_RESET_RX_FIFO;115 else116 mask = AXI_I2S_RESET_TX_FIFO;117 118 regmap_write(i2s->regmap, AXI_I2S_REG_RESET, mask);119 120 ret = snd_pcm_hw_constraint_ratnums(substream->runtime, 0,121 SNDRV_PCM_HW_PARAM_RATE,122 &i2s->rate_constraints);123 if (ret)124 return ret;125 126 return clk_prepare_enable(i2s->clk_ref);127}128 129static void axi_i2s_shutdown(struct snd_pcm_substream *substream,130 struct snd_soc_dai *dai)131{132 struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);133 134 clk_disable_unprepare(i2s->clk_ref);135}136 137static int axi_i2s_dai_probe(struct snd_soc_dai *dai)138{139 struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);140 141 snd_soc_dai_init_dma_data(142 dai,143 i2s->has_playback ? &i2s->playback_dma_data : NULL,144 i2s->has_capture ? &i2s->capture_dma_data : NULL);145 146 return 0;147}148 149static const struct snd_soc_dai_ops axi_i2s_dai_ops = {150 .probe = axi_i2s_dai_probe,151 .startup = axi_i2s_startup,152 .shutdown = axi_i2s_shutdown,153 .trigger = axi_i2s_trigger,154 .hw_params = axi_i2s_hw_params,155};156 157static struct snd_soc_dai_driver axi_i2s_dai = {158 .ops = &axi_i2s_dai_ops,159 .symmetric_rate = 1,160};161 162static const struct snd_soc_component_driver axi_i2s_component = {163 .name = "axi-i2s",164 .legacy_dai_naming = 1,165};166 167static const struct regmap_config axi_i2s_regmap_config = {168 .reg_bits = 32,169 .reg_stride = 4,170 .val_bits = 32,171 .max_register = AXI_I2S_REG_STATUS,172};173 174static void axi_i2s_parse_of(struct axi_i2s *i2s, const struct device_node *np)175{176 struct property *dma_names;177 const char *dma_name;178 179 of_property_for_each_string(np, "dma-names", dma_names, dma_name) {180 if (strcmp(dma_name, "rx") == 0)181 i2s->has_capture = true;182 if (strcmp(dma_name, "tx") == 0)183 i2s->has_playback = true;184 }185}186 187static int axi_i2s_probe(struct platform_device *pdev)188{189 struct resource *res;190 struct axi_i2s *i2s;191 void __iomem *base;192 int ret;193 194 i2s = devm_kzalloc(&pdev->dev, sizeof(*i2s), GFP_KERNEL);195 if (!i2s)196 return -ENOMEM;197 198 platform_set_drvdata(pdev, i2s);199 200 axi_i2s_parse_of(i2s, pdev->dev.of_node);201 202 base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);203 if (IS_ERR(base))204 return PTR_ERR(base);205 206 i2s->regmap = devm_regmap_init_mmio(&pdev->dev, base,207 &axi_i2s_regmap_config);208 if (IS_ERR(i2s->regmap))209 return PTR_ERR(i2s->regmap);210 211 i2s->clk = devm_clk_get(&pdev->dev, "axi");212 if (IS_ERR(i2s->clk))213 return PTR_ERR(i2s->clk);214 215 i2s->clk_ref = devm_clk_get(&pdev->dev, "ref");216 if (IS_ERR(i2s->clk_ref))217 return PTR_ERR(i2s->clk_ref);218 219 ret = clk_prepare_enable(i2s->clk);220 if (ret)221 return ret;222 223 if (i2s->has_playback) {224 axi_i2s_dai.playback.channels_min = 2;225 axi_i2s_dai.playback.channels_max = 2;226 axi_i2s_dai.playback.rates = SNDRV_PCM_RATE_KNOT;227 axi_i2s_dai.playback.formats =228 SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_U32_LE;229 230 i2s->playback_dma_data.addr = res->start + AXI_I2S_REG_TX_FIFO;231 i2s->playback_dma_data.addr_width = 4;232 i2s->playback_dma_data.maxburst = 1;233 }234 235 if (i2s->has_capture) {236 axi_i2s_dai.capture.channels_min = 2;237 axi_i2s_dai.capture.channels_max = 2;238 axi_i2s_dai.capture.rates = SNDRV_PCM_RATE_KNOT;239 axi_i2s_dai.capture.formats =240 SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_U32_LE;241 242 i2s->capture_dma_data.addr = res->start + AXI_I2S_REG_RX_FIFO;243 i2s->capture_dma_data.addr_width = 4;244 i2s->capture_dma_data.maxburst = 1;245 }246 247 i2s->ratnum.num = clk_get_rate(i2s->clk_ref) / 2 / AXI_I2S_BITS_PER_FRAME;248 i2s->ratnum.den_step = 1;249 i2s->ratnum.den_min = 1;250 i2s->ratnum.den_max = 64;251 252 i2s->rate_constraints.rats = &i2s->ratnum;253 i2s->rate_constraints.nrats = 1;254 255 regmap_write(i2s->regmap, AXI_I2S_REG_RESET, AXI_I2S_RESET_GLOBAL);256 257 ret = devm_snd_soc_register_component(&pdev->dev, &axi_i2s_component,258 &axi_i2s_dai, 1);259 if (ret)260 goto err_clk_disable;261 262 ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);263 if (ret)264 goto err_clk_disable;265 266 dev_info(&pdev->dev, "probed, capture %s, playback %s\n",267 str_enabled_disabled(i2s->has_capture),268 str_enabled_disabled(i2s->has_playback));269 270 return 0;271 272err_clk_disable:273 clk_disable_unprepare(i2s->clk);274 return ret;275}276 277static void axi_i2s_dev_remove(struct platform_device *pdev)278{279 struct axi_i2s *i2s = platform_get_drvdata(pdev);280 281 clk_disable_unprepare(i2s->clk);282}283 284static const struct of_device_id axi_i2s_of_match[] = {285 { .compatible = "adi,axi-i2s-1.00.a", },286 {},287};288MODULE_DEVICE_TABLE(of, axi_i2s_of_match);289 290static struct platform_driver axi_i2s_driver = {291 .driver = {292 .name = "axi-i2s",293 .of_match_table = axi_i2s_of_match,294 },295 .probe = axi_i2s_probe,296 .remove = axi_i2s_dev_remove,297};298module_platform_driver(axi_i2s_driver);299 300MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");301MODULE_DESCRIPTION("AXI I2S driver");302MODULE_LICENSE("GPL");303