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
26static struct snd_soc_dai *aiu_fifo_dai(struct snd_pcm_substream *ss)
27{
28 struct snd_soc_pcm_runtime *rtd = ss->private_data;
29
30 return snd_soc_rtd_to_cpu(rtd, 0);
31}
32
33snd_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(ss: 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, reg: fifo->mem_offset + AIU_MEM_RD);
42
43 return bytes_to_frames(runtime, size: addr - (unsigned int)runtime->dma_addr);
44}
45
46static 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 reg: fifo->mem_offset + AIU_MEM_CONTROL,
55 mask: en_mask, val: enable ? en_mask : 0);
56}
57
58int 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, enable: 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, enable: false);
71 break;
72 default:
73 return -EINVAL;
74 }
75
76 return 0;
77}
78
79int 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 reg: fifo->mem_offset + AIU_MEM_CONTROL,
87 AIU_MEM_CONTROL_INIT,
88 AIU_MEM_CONTROL_INIT);
89 snd_soc_component_update_bits(component,
90 reg: fifo->mem_offset + AIU_MEM_CONTROL,
91 AIU_MEM_CONTROL_INIT, val: 0);
92 return 0;
93}
94
95int 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, reg: fifo->mem_offset + AIU_MEM_START,
107 val: runtime->dma_addr);
108 snd_soc_component_write(component, reg: fifo->mem_offset + AIU_MEM_RD,
109 val: runtime->dma_addr);
110 snd_soc_component_write(component, reg: fifo->mem_offset + AIU_MEM_END,
111 val: end);
112
113 /* Setup the fifo to read all the memory - no skip */
114 snd_soc_component_update_bits(component,
115 reg: 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
123static 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(substream: playback);
128
129 return IRQ_HANDLED;
130}
131
132int 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, hw: 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(runtime: substream->runtime, cond: 0,
145 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
146 step: fifo->fifo_block);
147 if (ret)
148 return ret;
149
150 ret = snd_pcm_hw_constraint_step(runtime: substream->runtime, cond: 0,
151 SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
152 step: fifo->fifo_block);
153 if (ret)
154 return ret;
155
156 ret = clk_prepare_enable(clk: fifo->pclk);
157 if (ret)
158 return ret;
159
160 ret = request_irq(irq: fifo->irq, handler: aiu_fifo_isr, flags: 0, name: dev_name(dev: dai->dev),
161 dev: substream);
162 if (ret)
163 clk_disable_unprepare(clk: fifo->pclk);
164
165 return ret;
166}
167
168void 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(clk: fifo->pclk);
175}
176
177int 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(dev: card->dev, DMA_BIT_MASK(32));
186 if (ret)
187 return ret;
188
189 snd_pcm_set_managed_buffer_all(pcm: rtd->pcm, SNDRV_DMA_TYPE_DEV,
190 data: card->dev, size, max: size);
191
192 return 0;
193}
194
195int aiu_fifo_dai_probe(struct snd_soc_dai *dai)
196{
197 struct aiu_fifo *fifo;
198
199 fifo = kzalloc(size: 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
208int 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(objp: fifo);
213
214 return 0;
215}
216

source code of linux/sound/soc/meson/aiu-fifo.c