1 // SPDX-License-Identifier: GPL-2.0
3 // Copyright (c) 2020 BayLibre, SAS.
4 // Author: Jerome Brunet <jbrunet@baylibre.com>
6 #include <linux/bitfield.h>
8 #include <sound/pcm_params.h>
10 #include <sound/soc-dai.h>
14 #define AIU_I2S_SOURCE_DESC_MODE_8CH BIT(0)
15 #define AIU_I2S_SOURCE_DESC_MODE_24BIT BIT(5)
16 #define AIU_I2S_SOURCE_DESC_MODE_32BIT BIT(9)
17 #define AIU_I2S_SOURCE_DESC_MODE_SPLIT BIT(11)
18 #define AIU_RST_SOFT_I2S_FAST BIT(0)
20 #define AIU_I2S_DAC_CFG_MSB_FIRST BIT(2)
21 #define AIU_I2S_MISC_HOLD_EN BIT(2)
22 #define AIU_CLK_CTRL_I2S_DIV_EN BIT(0)
23 #define AIU_CLK_CTRL_I2S_DIV GENMASK(3, 2)
24 #define AIU_CLK_CTRL_AOCLK_INVERT BIT(6)
25 #define AIU_CLK_CTRL_LRCLK_INVERT BIT(7)
26 #define AIU_CLK_CTRL_LRCLK_SKEW GENMASK(9, 8)
27 #define AIU_CLK_CTRL_MORE_HDMI_AMCLK BIT(6)
28 #define AIU_CLK_CTRL_MORE_I2S_DIV GENMASK(5, 0)
29 #define AIU_CODEC_DAC_LRCLK_CTRL_DIV GENMASK(11, 0)
31 static void aiu_encoder_i2s_divider_enable(struct snd_soc_component *component,
34 snd_soc_component_update_bits(component, AIU_CLK_CTRL,
35 AIU_CLK_CTRL_I2S_DIV_EN,
36 enable ? AIU_CLK_CTRL_I2S_DIV_EN : 0);
39 static void aiu_encoder_i2s_hold(struct snd_soc_component *component,
42 snd_soc_component_update_bits(component, AIU_I2S_MISC,
44 enable ? AIU_I2S_MISC_HOLD_EN : 0);
47 static int aiu_encoder_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
48 struct snd_soc_dai *dai)
50 struct snd_soc_component *component = dai->component;
53 case SNDRV_PCM_TRIGGER_START:
54 case SNDRV_PCM_TRIGGER_RESUME:
55 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
56 aiu_encoder_i2s_hold(component, false);
59 case SNDRV_PCM_TRIGGER_STOP:
60 case SNDRV_PCM_TRIGGER_SUSPEND:
61 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
62 aiu_encoder_i2s_hold(component, true);
70 static int aiu_encoder_i2s_setup_desc(struct snd_soc_component *component,
71 struct snd_pcm_hw_params *params)
73 /* Always operate in split (classic interleaved) mode */
74 unsigned int desc = AIU_I2S_SOURCE_DESC_MODE_SPLIT;
77 /* Reset required to update the pipeline */
78 snd_soc_component_write(component, AIU_RST_SOFT, AIU_RST_SOFT_I2S_FAST);
79 snd_soc_component_read(component, AIU_I2S_SYNC, &val);
81 switch (params_physical_width(params)) {
82 case 16: /* Nothing to do */
86 desc |= (AIU_I2S_SOURCE_DESC_MODE_24BIT |
87 AIU_I2S_SOURCE_DESC_MODE_32BIT);
94 switch (params_channels(params)) {
95 case 2: /* Nothing to do */
98 desc |= AIU_I2S_SOURCE_DESC_MODE_8CH;
104 snd_soc_component_update_bits(component, AIU_I2S_SOURCE_DESC,
105 AIU_I2S_SOURCE_DESC_MODE_8CH |
106 AIU_I2S_SOURCE_DESC_MODE_24BIT |
107 AIU_I2S_SOURCE_DESC_MODE_32BIT |
108 AIU_I2S_SOURCE_DESC_MODE_SPLIT,
114 static int aiu_encoder_i2s_set_legacy_div(struct snd_soc_component *component,
115 struct snd_pcm_hw_params *params,
123 /* These are the only valid legacy dividers */
127 dev_err(component->dev, "Unsupported i2s divider: %u\n", bs);
131 snd_soc_component_update_bits(component, AIU_CLK_CTRL,
132 AIU_CLK_CTRL_I2S_DIV,
133 FIELD_PREP(AIU_CLK_CTRL_I2S_DIV,
136 snd_soc_component_update_bits(component, AIU_CLK_CTRL_MORE,
137 AIU_CLK_CTRL_MORE_I2S_DIV,
138 FIELD_PREP(AIU_CLK_CTRL_MORE_I2S_DIV,
144 static int aiu_encoder_i2s_set_more_div(struct snd_soc_component *component,
145 struct snd_pcm_hw_params *params,
149 * NOTE: this HW is odd.
150 * In most configuration, the i2s divider is 'mclk / blck'.
151 * However, in 16 bits - 8ch mode, this factor needs to be
152 * increased by 50% to get the correct output rate.
155 if (params_width(params) == 16 && params_channels(params) == 8) {
157 dev_err(component->dev,
158 "Cannot increase i2s divider by 50%%\n");
164 /* Use CLK_MORE for mclk to bclk divider */
165 snd_soc_component_update_bits(component, AIU_CLK_CTRL,
166 AIU_CLK_CTRL_I2S_DIV,
167 FIELD_PREP(AIU_CLK_CTRL_I2S_DIV, 0));
169 snd_soc_component_update_bits(component, AIU_CLK_CTRL_MORE,
170 AIU_CLK_CTRL_MORE_I2S_DIV,
171 FIELD_PREP(AIU_CLK_CTRL_MORE_I2S_DIV,
177 static int aiu_encoder_i2s_set_clocks(struct snd_soc_component *component,
178 struct snd_pcm_hw_params *params)
180 struct aiu *aiu = snd_soc_component_get_drvdata(component);
181 unsigned int srate = params_rate(params);
185 /* Get the oversampling factor */
186 fs = DIV_ROUND_CLOSEST(clk_get_rate(aiu->i2s.clks[MCLK].clk), srate);
191 /* Send data MSB first */
192 snd_soc_component_update_bits(component, AIU_I2S_DAC_CFG,
193 AIU_I2S_DAC_CFG_MSB_FIRST,
194 AIU_I2S_DAC_CFG_MSB_FIRST);
196 /* Set bclk to lrlck ratio */
197 snd_soc_component_update_bits(component, AIU_CODEC_DAC_LRCLK_CTRL,
198 AIU_CODEC_DAC_LRCLK_CTRL_DIV,
199 FIELD_PREP(AIU_CODEC_DAC_LRCLK_CTRL_DIV,
204 if (aiu->platform->has_clk_ctrl_more_i2s_div)
205 ret = aiu_encoder_i2s_set_more_div(component, params, bs);
207 ret = aiu_encoder_i2s_set_legacy_div(component, params, bs);
212 /* Make sure amclk is used for HDMI i2s as well */
213 snd_soc_component_update_bits(component, AIU_CLK_CTRL_MORE,
214 AIU_CLK_CTRL_MORE_HDMI_AMCLK,
215 AIU_CLK_CTRL_MORE_HDMI_AMCLK);
220 static int aiu_encoder_i2s_hw_params(struct snd_pcm_substream *substream,
221 struct snd_pcm_hw_params *params,
222 struct snd_soc_dai *dai)
224 struct snd_soc_component *component = dai->component;
227 /* Disable the clock while changing the settings */
228 aiu_encoder_i2s_divider_enable(component, false);
230 ret = aiu_encoder_i2s_setup_desc(component, params);
232 dev_err(dai->dev, "setting i2s desc failed\n");
236 ret = aiu_encoder_i2s_set_clocks(component, params);
238 dev_err(dai->dev, "setting i2s clocks failed\n");
242 aiu_encoder_i2s_divider_enable(component, true);
247 static int aiu_encoder_i2s_hw_free(struct snd_pcm_substream *substream,
248 struct snd_soc_dai *dai)
250 struct snd_soc_component *component = dai->component;
252 aiu_encoder_i2s_divider_enable(component, false);
257 static int aiu_encoder_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
259 struct snd_soc_component *component = dai->component;
260 unsigned int inv = fmt & SND_SOC_DAIFMT_INV_MASK;
261 unsigned int val = 0;
264 /* Only CPU Master / Codec Slave supported ATM */
265 if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
268 if (inv == SND_SOC_DAIFMT_NB_IF ||
269 inv == SND_SOC_DAIFMT_IB_IF)
270 val |= AIU_CLK_CTRL_LRCLK_INVERT;
272 if (inv == SND_SOC_DAIFMT_IB_NF ||
273 inv == SND_SOC_DAIFMT_IB_IF)
274 val |= AIU_CLK_CTRL_AOCLK_INVERT;
277 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
278 case SND_SOC_DAIFMT_I2S:
279 /* Invert sample clock for i2s */
280 val ^= AIU_CLK_CTRL_LRCLK_INVERT;
283 case SND_SOC_DAIFMT_LEFT_J:
290 val |= FIELD_PREP(AIU_CLK_CTRL_LRCLK_SKEW, skew);
291 snd_soc_component_update_bits(component, AIU_CLK_CTRL,
292 AIU_CLK_CTRL_LRCLK_INVERT |
293 AIU_CLK_CTRL_AOCLK_INVERT |
294 AIU_CLK_CTRL_LRCLK_SKEW,
300 static int aiu_encoder_i2s_set_sysclk(struct snd_soc_dai *dai, int clk_id,
301 unsigned int freq, int dir)
303 struct aiu *aiu = snd_soc_component_get_drvdata(dai->component);
306 if (WARN_ON(clk_id != 0))
309 if (dir == SND_SOC_CLOCK_IN)
312 ret = clk_set_rate(aiu->i2s.clks[MCLK].clk, freq);
314 dev_err(dai->dev, "Failed to set sysclk to %uHz", freq);
319 static const unsigned int hw_channels[] = {2, 8};
320 static const struct snd_pcm_hw_constraint_list hw_channel_constraints = {
322 .count = ARRAY_SIZE(hw_channels),
326 static int aiu_encoder_i2s_startup(struct snd_pcm_substream *substream,
327 struct snd_soc_dai *dai)
329 struct aiu *aiu = snd_soc_component_get_drvdata(dai->component);
332 /* Make sure the encoder gets either 2 or 8 channels */
333 ret = snd_pcm_hw_constraint_list(substream->runtime, 0,
334 SNDRV_PCM_HW_PARAM_CHANNELS,
335 &hw_channel_constraints);
337 dev_err(dai->dev, "adding channels constraints failed\n");
341 ret = clk_bulk_prepare_enable(aiu->i2s.clk_num, aiu->i2s.clks);
343 dev_err(dai->dev, "failed to enable i2s clocks\n");
348 static void aiu_encoder_i2s_shutdown(struct snd_pcm_substream *substream,
349 struct snd_soc_dai *dai)
351 struct aiu *aiu = snd_soc_component_get_drvdata(dai->component);
353 clk_bulk_disable_unprepare(aiu->i2s.clk_num, aiu->i2s.clks);
356 const struct snd_soc_dai_ops aiu_encoder_i2s_dai_ops = {
357 .trigger = aiu_encoder_i2s_trigger,
358 .hw_params = aiu_encoder_i2s_hw_params,
359 .hw_free = aiu_encoder_i2s_hw_free,
360 .set_fmt = aiu_encoder_i2s_set_fmt,
361 .set_sysclk = aiu_encoder_i2s_set_sysclk,
362 .startup = aiu_encoder_i2s_startup,
363 .shutdown = aiu_encoder_i2s_shutdown,