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 #define AIU_I2S_MISC_HOLD_EN BIT(2) 24 #define AIU_I2S_MISC_FORCE_LEFT_RIGHT BIT(4) 25 26 #define AIU_FIFO_I2S_BLOCK 256 27 28 static struct snd_pcm_hardware fifo_i2s_pcm = { 29 .info = (SNDRV_PCM_INFO_INTERLEAVED | 30 SNDRV_PCM_INFO_MMAP | 31 SNDRV_PCM_INFO_MMAP_VALID | 32 SNDRV_PCM_INFO_PAUSE), 33 .formats = AIU_FORMATS, 34 .rate_min = 5512, 35 .rate_max = 192000, 36 .channels_min = 2, 37 .channels_max = 8, 38 .period_bytes_min = AIU_FIFO_I2S_BLOCK, 39 .period_bytes_max = AIU_FIFO_I2S_BLOCK * USHRT_MAX, 40 .periods_min = 2, 41 .periods_max = UINT_MAX, 42 43 /* No real justification for this */ 44 .buffer_bytes_max = 1 * 1024 * 1024, 45 }; 46 47 static int aiu_fifo_i2s_trigger(struct snd_pcm_substream *substream, int cmd, 48 struct snd_soc_dai *dai) 49 { 50 struct snd_soc_component *component = dai->component; 51 52 switch (cmd) { 53 case SNDRV_PCM_TRIGGER_START: 54 case SNDRV_PCM_TRIGGER_RESUME: 55 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 56 snd_soc_component_write(component, AIU_RST_SOFT, 57 AIU_RST_SOFT_I2S_FAST); 58 snd_soc_component_read(component, AIU_I2S_SYNC); 59 break; 60 } 61 62 return aiu_fifo_trigger(substream, cmd, dai); 63 } 64 65 static int aiu_fifo_i2s_prepare(struct snd_pcm_substream *substream, 66 struct snd_soc_dai *dai) 67 { 68 struct snd_soc_component *component = dai->component; 69 int ret; 70 71 ret = aiu_fifo_prepare(substream, dai); 72 if (ret) 73 return ret; 74 75 snd_soc_component_update_bits(component, 76 AIU_MEM_I2S_BUF_CNTL, 77 AIU_MEM_I2S_BUF_CNTL_INIT, 78 AIU_MEM_I2S_BUF_CNTL_INIT); 79 snd_soc_component_update_bits(component, 80 AIU_MEM_I2S_BUF_CNTL, 81 AIU_MEM_I2S_BUF_CNTL_INIT, 0); 82 83 return 0; 84 } 85 86 static int aiu_fifo_i2s_hw_params(struct snd_pcm_substream *substream, 87 struct snd_pcm_hw_params *params, 88 struct snd_soc_dai *dai) 89 { 90 struct snd_soc_component *component = dai->component; 91 struct aiu_fifo *fifo = snd_soc_dai_dma_data_get_playback(dai); 92 unsigned int val; 93 int ret; 94 95 snd_soc_component_update_bits(component, AIU_I2S_MISC, 96 AIU_I2S_MISC_HOLD_EN, 97 AIU_I2S_MISC_HOLD_EN); 98 99 ret = aiu_fifo_hw_params(substream, params, dai); 100 if (ret) 101 return ret; 102 103 switch (params_physical_width(params)) { 104 case 16: 105 val = AIU_MEM_I2S_CONTROL_MODE_16BIT; 106 break; 107 case 32: 108 val = 0; 109 break; 110 default: 111 dev_err(dai->dev, "Unsupported physical width %u\n", 112 params_physical_width(params)); 113 return -EINVAL; 114 } 115 116 snd_soc_component_update_bits(component, AIU_MEM_I2S_CONTROL, 117 AIU_MEM_I2S_CONTROL_MODE_16BIT, 118 val); 119 120 /* Setup the irq periodicity */ 121 val = params_period_bytes(params) / fifo->fifo_block; 122 val = FIELD_PREP(AIU_MEM_I2S_MASKS_IRQ_BLOCK, val); 123 snd_soc_component_update_bits(component, AIU_MEM_I2S_MASKS, 124 AIU_MEM_I2S_MASKS_IRQ_BLOCK, val); 125 126 /* 127 * Most (all?) supported SoCs have this bit set by default. The vendor 128 * driver however sets it manually (depending on the version either 129 * while un-setting AIU_I2S_MISC_HOLD_EN or right before that). Follow 130 * the same approach for consistency with the vendor driver. 131 */ 132 snd_soc_component_update_bits(component, AIU_I2S_MISC, 133 AIU_I2S_MISC_FORCE_LEFT_RIGHT, 134 AIU_I2S_MISC_FORCE_LEFT_RIGHT); 135 136 snd_soc_component_update_bits(component, AIU_I2S_MISC, 137 AIU_I2S_MISC_HOLD_EN, 0); 138 139 return 0; 140 } 141 142 const struct snd_soc_dai_ops aiu_fifo_i2s_dai_ops = { 143 .trigger = aiu_fifo_i2s_trigger, 144 .prepare = aiu_fifo_i2s_prepare, 145 .hw_params = aiu_fifo_i2s_hw_params, 146 .startup = aiu_fifo_startup, 147 .shutdown = aiu_fifo_shutdown, 148 }; 149 150 int aiu_fifo_i2s_dai_probe(struct snd_soc_dai *dai) 151 { 152 struct snd_soc_component *component = dai->component; 153 struct aiu *aiu = snd_soc_component_get_drvdata(component); 154 struct aiu_fifo *fifo; 155 int ret; 156 157 ret = aiu_fifo_dai_probe(dai); 158 if (ret) 159 return ret; 160 161 fifo = snd_soc_dai_dma_data_get_playback(dai); 162 163 fifo->pcm = &fifo_i2s_pcm; 164 fifo->mem_offset = AIU_MEM_I2S_START; 165 fifo->fifo_block = AIU_FIFO_I2S_BLOCK; 166 fifo->pclk = aiu->i2s.clks[PCLK].clk; 167 fifo->irq = aiu->i2s.irq; 168 169 return 0; 170 } 171