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-fifo.h" 13 14 #define AIU_MEM_START 0x00 15 #define AIU_MEM_RD 0x04 16 #define AIU_MEM_END 0x08 17 #define AIU_MEM_MASKS 0x0c 18 #define AIU_MEM_MASK_CH_RD GENMASK(7, 0) 19 #define AIU_MEM_MASK_CH_MEM GENMASK(15, 8) 20 #define AIU_MEM_CONTROL 0x10 21 #define AIU_MEM_CONTROL_INIT BIT(0) 22 #define AIU_MEM_CONTROL_FILL_EN BIT(1) 23 #define AIU_MEM_CONTROL_EMPTY_EN BIT(2) 24 25 static struct snd_soc_dai *aiu_fifo_dai(struct snd_pcm_substream *ss) 26 { 27 struct snd_soc_pcm_runtime *rtd = ss->private_data; 28 29 return asoc_rtd_to_cpu(rtd, 0); 30 } 31 32 snd_pcm_uframes_t aiu_fifo_pointer(struct snd_soc_component *component, 33 struct snd_pcm_substream *substream) 34 { 35 struct snd_soc_dai *dai = aiu_fifo_dai(substream); 36 struct aiu_fifo *fifo = dai->playback_dma_data; 37 struct snd_pcm_runtime *runtime = substream->runtime; 38 unsigned int addr; 39 40 addr = snd_soc_component_read(component, fifo->mem_offset + AIU_MEM_RD); 41 42 return bytes_to_frames(runtime, addr - (unsigned int)runtime->dma_addr); 43 } 44 45 static void aiu_fifo_enable(struct snd_soc_dai *dai, bool enable) 46 { 47 struct snd_soc_component *component = dai->component; 48 struct aiu_fifo *fifo = dai->playback_dma_data; 49 unsigned int en_mask = (AIU_MEM_CONTROL_FILL_EN | 50 AIU_MEM_CONTROL_EMPTY_EN); 51 52 snd_soc_component_update_bits(component, 53 fifo->mem_offset + AIU_MEM_CONTROL, 54 en_mask, enable ? en_mask : 0); 55 } 56 57 int aiu_fifo_trigger(struct snd_pcm_substream *substream, int cmd, 58 struct snd_soc_dai *dai) 59 { 60 switch (cmd) { 61 case SNDRV_PCM_TRIGGER_START: 62 case SNDRV_PCM_TRIGGER_RESUME: 63 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 64 aiu_fifo_enable(dai, true); 65 break; 66 case SNDRV_PCM_TRIGGER_SUSPEND: 67 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 68 case SNDRV_PCM_TRIGGER_STOP: 69 aiu_fifo_enable(dai, false); 70 break; 71 default: 72 return -EINVAL; 73 } 74 75 return 0; 76 } 77 78 int aiu_fifo_prepare(struct snd_pcm_substream *substream, 79 struct snd_soc_dai *dai) 80 { 81 struct snd_soc_component *component = dai->component; 82 struct aiu_fifo *fifo = dai->playback_dma_data; 83 84 snd_soc_component_update_bits(component, 85 fifo->mem_offset + AIU_MEM_CONTROL, 86 AIU_MEM_CONTROL_INIT, 87 AIU_MEM_CONTROL_INIT); 88 snd_soc_component_update_bits(component, 89 fifo->mem_offset + AIU_MEM_CONTROL, 90 AIU_MEM_CONTROL_INIT, 0); 91 return 0; 92 } 93 94 int aiu_fifo_hw_params(struct snd_pcm_substream *substream, 95 struct snd_pcm_hw_params *params, 96 struct snd_soc_dai *dai) 97 { 98 struct snd_pcm_runtime *runtime = substream->runtime; 99 struct snd_soc_component *component = dai->component; 100 struct aiu_fifo *fifo = dai->playback_dma_data; 101 dma_addr_t end; 102 103 /* Setup the fifo boundaries */ 104 end = runtime->dma_addr + runtime->dma_bytes - fifo->fifo_block; 105 snd_soc_component_write(component, fifo->mem_offset + AIU_MEM_START, 106 runtime->dma_addr); 107 snd_soc_component_write(component, fifo->mem_offset + AIU_MEM_RD, 108 runtime->dma_addr); 109 snd_soc_component_write(component, fifo->mem_offset + AIU_MEM_END, 110 end); 111 112 /* Setup the fifo to read all the memory - no skip */ 113 snd_soc_component_update_bits(component, 114 fifo->mem_offset + AIU_MEM_MASKS, 115 AIU_MEM_MASK_CH_RD | AIU_MEM_MASK_CH_MEM, 116 FIELD_PREP(AIU_MEM_MASK_CH_RD, 0xff) | 117 FIELD_PREP(AIU_MEM_MASK_CH_MEM, 0xff)); 118 119 return 0; 120 } 121 122 static irqreturn_t aiu_fifo_isr(int irq, void *dev_id) 123 { 124 struct snd_pcm_substream *playback = dev_id; 125 126 snd_pcm_period_elapsed(playback); 127 128 return IRQ_HANDLED; 129 } 130 131 int aiu_fifo_startup(struct snd_pcm_substream *substream, 132 struct snd_soc_dai *dai) 133 { 134 struct aiu_fifo *fifo = dai->playback_dma_data; 135 int ret; 136 137 snd_soc_set_runtime_hwparams(substream, fifo->pcm); 138 139 /* 140 * Make sure the buffer and period size are multiple of the fifo burst 141 * size 142 */ 143 ret = snd_pcm_hw_constraint_step(substream->runtime, 0, 144 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 145 fifo->fifo_block); 146 if (ret) 147 return ret; 148 149 ret = snd_pcm_hw_constraint_step(substream->runtime, 0, 150 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 151 fifo->fifo_block); 152 if (ret) 153 return ret; 154 155 ret = clk_prepare_enable(fifo->pclk); 156 if (ret) 157 return ret; 158 159 ret = request_irq(fifo->irq, aiu_fifo_isr, 0, dev_name(dai->dev), 160 substream); 161 if (ret) 162 clk_disable_unprepare(fifo->pclk); 163 164 return ret; 165 } 166 167 void aiu_fifo_shutdown(struct snd_pcm_substream *substream, 168 struct snd_soc_dai *dai) 169 { 170 struct aiu_fifo *fifo = dai->playback_dma_data; 171 172 free_irq(fifo->irq, substream); 173 clk_disable_unprepare(fifo->pclk); 174 } 175 176 int aiu_fifo_pcm_new(struct snd_soc_pcm_runtime *rtd, 177 struct snd_soc_dai *dai) 178 { 179 struct snd_card *card = rtd->card->snd_card; 180 struct aiu_fifo *fifo = dai->playback_dma_data; 181 size_t size = fifo->pcm->buffer_bytes_max; 182 183 snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV, 184 card->dev, size, size); 185 186 return 0; 187 } 188 189 int aiu_fifo_dai_probe(struct snd_soc_dai *dai) 190 { 191 struct aiu_fifo *fifo; 192 193 fifo = kzalloc(sizeof(*fifo), GFP_KERNEL); 194 if (!fifo) 195 return -ENOMEM; 196 197 dai->playback_dma_data = fifo; 198 199 return 0; 200 } 201 202 int aiu_fifo_dai_remove(struct snd_soc_dai *dai) 203 { 204 kfree(dai->playback_dma_data); 205 206 return 0; 207 } 208 209