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 <linux/dma-mapping.h>
9 #include <sound/pcm_params.h>
10 #include <sound/soc.h>
11 #include <sound/soc-dai.h>
12
13 #include "aiu-fifo.h"
14
15 #define AIU_MEM_START 0x00
16 #define AIU_MEM_RD 0x04
17 #define AIU_MEM_END 0x08
18 #define AIU_MEM_MASKS 0x0c
19 #define AIU_MEM_MASK_CH_RD GENMASK(7, 0)
20 #define AIU_MEM_MASK_CH_MEM GENMASK(15, 8)
21 #define AIU_MEM_CONTROL 0x10
22 #define AIU_MEM_CONTROL_INIT BIT(0)
23 #define AIU_MEM_CONTROL_FILL_EN BIT(1)
24 #define AIU_MEM_CONTROL_EMPTY_EN BIT(2)
25
26 static struct snd_soc_dai *aiu_fifo_dai(struct snd_pcm_substream *ss)
27 {
28 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(ss);
29
30 return snd_soc_rtd_to_cpu(rtd, 0);
31 }
32
33 snd_pcm_uframes_t aiu_fifo_pointer(struct snd_soc_component *component,
34 struct snd_pcm_substream *substream)
35 {
36 struct snd_soc_dai *dai = aiu_fifo_dai(substream);
37 struct aiu_fifo *fifo = snd_soc_dai_dma_data_get_playback(dai);
38 struct snd_pcm_runtime *runtime = substream->runtime;
39 unsigned int addr;
40
41 addr = snd_soc_component_read(component, fifo->mem_offset + AIU_MEM_RD);
42
43 return bytes_to_frames(runtime, addr - (unsigned int)runtime->dma_addr);
44 }
45
46 static void aiu_fifo_enable(struct snd_soc_dai *dai, bool enable)
47 {
48 struct snd_soc_component *component = dai->component;
49 struct aiu_fifo *fifo = snd_soc_dai_dma_data_get_playback(dai);
50 unsigned int en_mask = (AIU_MEM_CONTROL_FILL_EN |
51 AIU_MEM_CONTROL_EMPTY_EN);
52
53 snd_soc_component_update_bits(component,
54 fifo->mem_offset + AIU_MEM_CONTROL,
55 en_mask, enable ? en_mask : 0);
56 }
57
58 int aiu_fifo_trigger(struct snd_pcm_substream *substream, int cmd,
59 struct snd_soc_dai *dai)
60 {
61 switch (cmd) {
62 case SNDRV_PCM_TRIGGER_START:
63 case SNDRV_PCM_TRIGGER_RESUME:
64 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
65 aiu_fifo_enable(dai, true);
66 break;
67 case SNDRV_PCM_TRIGGER_SUSPEND:
68 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
69 case SNDRV_PCM_TRIGGER_STOP:
70 aiu_fifo_enable(dai, false);
71 break;
72 default:
73 return -EINVAL;
74 }
75
76 return 0;
77 }
78
79 int aiu_fifo_prepare(struct snd_pcm_substream *substream,
80 struct snd_soc_dai *dai)
81 {
82 struct snd_soc_component *component = dai->component;
83 struct aiu_fifo *fifo = snd_soc_dai_dma_data_get_playback(dai);
84
85 snd_soc_component_update_bits(component,
86 fifo->mem_offset + AIU_MEM_CONTROL,
87 AIU_MEM_CONTROL_INIT,
88 AIU_MEM_CONTROL_INIT);
89 snd_soc_component_update_bits(component,
90 fifo->mem_offset + AIU_MEM_CONTROL,
91 AIU_MEM_CONTROL_INIT, 0);
92 return 0;
93 }
94
95 int aiu_fifo_hw_params(struct snd_pcm_substream *substream,
96 struct snd_pcm_hw_params *params,
97 struct snd_soc_dai *dai)
98 {
99 struct snd_pcm_runtime *runtime = substream->runtime;
100 struct snd_soc_component *component = dai->component;
101 struct aiu_fifo *fifo = snd_soc_dai_dma_data_get_playback(dai);
102 dma_addr_t end;
103
104 /* Setup the fifo boundaries */
105 end = runtime->dma_addr + runtime->dma_bytes - fifo->fifo_block;
106 snd_soc_component_write(component, fifo->mem_offset + AIU_MEM_START,
107 runtime->dma_addr);
108 snd_soc_component_write(component, fifo->mem_offset + AIU_MEM_RD,
109 runtime->dma_addr);
110 snd_soc_component_write(component, fifo->mem_offset + AIU_MEM_END,
111 end);
112
113 /* Setup the fifo to read all the memory - no skip */
114 snd_soc_component_update_bits(component,
115 fifo->mem_offset + AIU_MEM_MASKS,
116 AIU_MEM_MASK_CH_RD | AIU_MEM_MASK_CH_MEM,
117 FIELD_PREP(AIU_MEM_MASK_CH_RD, 0xff) |
118 FIELD_PREP(AIU_MEM_MASK_CH_MEM, 0xff));
119
120 return 0;
121 }
122
123 static irqreturn_t aiu_fifo_isr(int irq, void *dev_id)
124 {
125 struct snd_pcm_substream *playback = dev_id;
126
127 snd_pcm_period_elapsed(playback);
128
129 return IRQ_HANDLED;
130 }
131
132 int aiu_fifo_startup(struct snd_pcm_substream *substream,
133 struct snd_soc_dai *dai)
134 {
135 struct aiu_fifo *fifo = snd_soc_dai_dma_data_get_playback(dai);
136 int ret;
137
138 snd_soc_set_runtime_hwparams(substream, fifo->pcm);
139
140 /*
141 * Make sure the buffer and period size are multiple of the fifo burst
142 * size
143 */
144 ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
145 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
146 fifo->fifo_block);
147 if (ret)
148 return ret;
149
150 ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
151 SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
152 fifo->fifo_block);
153 if (ret)
154 return ret;
155
156 ret = clk_prepare_enable(fifo->pclk);
157 if (ret)
158 return ret;
159
160 ret = request_irq(fifo->irq, aiu_fifo_isr, 0, dev_name(dai->dev),
161 substream);
162 if (ret)
163 clk_disable_unprepare(fifo->pclk);
164
165 return ret;
166 }
167
168 void aiu_fifo_shutdown(struct snd_pcm_substream *substream,
169 struct snd_soc_dai *dai)
170 {
171 struct aiu_fifo *fifo = snd_soc_dai_dma_data_get_playback(dai);
172
173 free_irq(fifo->irq, substream);
174 clk_disable_unprepare(fifo->pclk);
175 }
176
177 int aiu_fifo_pcm_new(struct snd_soc_pcm_runtime *rtd,
178 struct snd_soc_dai *dai)
179 {
180 struct snd_card *card = rtd->card->snd_card;
181 struct aiu_fifo *fifo = snd_soc_dai_dma_data_get_playback(dai);
182 size_t size = fifo->pcm->buffer_bytes_max;
183 int ret;
184
185 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
186 if (ret)
187 return ret;
188
189 snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
190 card->dev, size, size);
191
192 return 0;
193 }
194
195 int aiu_fifo_dai_probe(struct snd_soc_dai *dai)
196 {
197 struct aiu_fifo *fifo;
198
199 fifo = kzalloc(sizeof(*fifo), GFP_KERNEL);
200 if (!fifo)
201 return -ENOMEM;
202
203 snd_soc_dai_dma_data_set_playback(dai, fifo);
204
205 return 0;
206 }
207
208 int aiu_fifo_dai_remove(struct snd_soc_dai *dai)
209 {
210 struct aiu_fifo *fifo = snd_soc_dai_dma_data_get_playback(dai);
211
212 kfree(fifo);
213
214 return 0;
215 }
216
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