1 // SPDX-License-Identifier: GPL-2.0 2 // 3 // Copyright (c) 2020 BayLibre, SAS. 4 // Author: Jerome Brunet <jbrunet@baylibre.com> 5 6 #include <linux/bitfield.h> 7 #include <linux/clk.h> 8 #include <sound/pcm_params.h> 9 #include <sound/soc.h> 10 #include <sound/soc-dai.h> 11 12 #include "aiu.h" 13 #include "aiu-fifo.h" 14 15 #define AIU_I2S_SOURCE_DESC_MODE_8CH BIT(0) 16 #define AIU_I2S_SOURCE_DESC_MODE_24BIT BIT(5) 17 #define AIU_I2S_SOURCE_DESC_MODE_32BIT BIT(9) 18 #define AIU_I2S_SOURCE_DESC_MODE_SPLIT BIT(11) 19 #define AIU_MEM_I2S_MASKS_IRQ_BLOCK GENMASK(31, 16) 20 #define AIU_MEM_I2S_CONTROL_MODE_16BIT BIT(6) 21 #define AIU_MEM_I2S_BUF_CNTL_INIT BIT(0) 22 #define AIU_RST_SOFT_I2S_FAST BIT(0) 23 24 #define AIU_FIFO_I2S_BLOCK 256 25 26 static struct snd_pcm_hardware fifo_i2s_pcm = { 27 .info = (SNDRV_PCM_INFO_INTERLEAVED | 28 SNDRV_PCM_INFO_MMAP | 29 SNDRV_PCM_INFO_MMAP_VALID | 30 SNDRV_PCM_INFO_PAUSE), 31 .formats = AIU_FORMATS, 32 .rate_min = 5512, 33 .rate_max = 192000, 34 .channels_min = 2, 35 .channels_max = 8, 36 .period_bytes_min = AIU_FIFO_I2S_BLOCK, 37 .period_bytes_max = AIU_FIFO_I2S_BLOCK * USHRT_MAX, 38 .periods_min = 2, 39 .periods_max = UINT_MAX, 40 41 /* No real justification for this */ 42 .buffer_bytes_max = 1 * 1024 * 1024, 43 }; 44 45 static int aiu_fifo_i2s_trigger(struct snd_pcm_substream *substream, int cmd, 46 struct snd_soc_dai *dai) 47 { 48 struct snd_soc_component *component = dai->component; 49 50 switch (cmd) { 51 case SNDRV_PCM_TRIGGER_START: 52 case SNDRV_PCM_TRIGGER_RESUME: 53 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 54 snd_soc_component_write(component, AIU_RST_SOFT, 55 AIU_RST_SOFT_I2S_FAST); 56 snd_soc_component_read(component, AIU_I2S_SYNC); 57 break; 58 } 59 60 return aiu_fifo_trigger(substream, cmd, dai); 61 } 62 63 static int aiu_fifo_i2s_prepare(struct snd_pcm_substream *substream, 64 struct snd_soc_dai *dai) 65 { 66 struct snd_soc_component *component = dai->component; 67 int ret; 68 69 ret = aiu_fifo_prepare(substream, dai); 70 if (ret) 71 return ret; 72 73 snd_soc_component_update_bits(component, 74 AIU_MEM_I2S_BUF_CNTL, 75 AIU_MEM_I2S_BUF_CNTL_INIT, 76 AIU_MEM_I2S_BUF_CNTL_INIT); 77 snd_soc_component_update_bits(component, 78 AIU_MEM_I2S_BUF_CNTL, 79 AIU_MEM_I2S_BUF_CNTL_INIT, 0); 80 81 return 0; 82 } 83 84 static int aiu_fifo_i2s_hw_params(struct snd_pcm_substream *substream, 85 struct snd_pcm_hw_params *params, 86 struct snd_soc_dai *dai) 87 { 88 struct snd_soc_component *component = dai->component; 89 struct aiu_fifo *fifo = dai->playback_dma_data; 90 unsigned int val; 91 int ret; 92 93 ret = aiu_fifo_hw_params(substream, params, dai); 94 if (ret) 95 return ret; 96 97 switch (params_physical_width(params)) { 98 case 16: 99 val = AIU_MEM_I2S_CONTROL_MODE_16BIT; 100 break; 101 case 32: 102 val = 0; 103 break; 104 default: 105 dev_err(dai->dev, "Unsupported physical width %u\n", 106 params_physical_width(params)); 107 return -EINVAL; 108 } 109 110 snd_soc_component_update_bits(component, AIU_MEM_I2S_CONTROL, 111 AIU_MEM_I2S_CONTROL_MODE_16BIT, 112 val); 113 114 /* Setup the irq periodicity */ 115 val = params_period_bytes(params) / fifo->fifo_block; 116 val = FIELD_PREP(AIU_MEM_I2S_MASKS_IRQ_BLOCK, val); 117 snd_soc_component_update_bits(component, AIU_MEM_I2S_MASKS, 118 AIU_MEM_I2S_MASKS_IRQ_BLOCK, val); 119 120 return 0; 121 } 122 123 const struct snd_soc_dai_ops aiu_fifo_i2s_dai_ops = { 124 .trigger = aiu_fifo_i2s_trigger, 125 .prepare = aiu_fifo_i2s_prepare, 126 .hw_params = aiu_fifo_i2s_hw_params, 127 .startup = aiu_fifo_startup, 128 .shutdown = aiu_fifo_shutdown, 129 }; 130 131 int aiu_fifo_i2s_dai_probe(struct snd_soc_dai *dai) 132 { 133 struct snd_soc_component *component = dai->component; 134 struct aiu *aiu = snd_soc_component_get_drvdata(component); 135 struct aiu_fifo *fifo; 136 int ret; 137 138 ret = aiu_fifo_dai_probe(dai); 139 if (ret) 140 return ret; 141 142 fifo = dai->playback_dma_data; 143 144 fifo->pcm = &fifo_i2s_pcm; 145 fifo->mem_offset = AIU_MEM_I2S_START; 146 fifo->fifo_block = AIU_FIFO_I2S_BLOCK; 147 fifo->pclk = aiu->i2s.clks[PCLK].clk; 148 fifo->irq = aiu->i2s.irq; 149 150 return 0; 151 } 152