1// SPDX-License-Identifier: GPL-2.0
2//
3// Socionext UniPhier AIO DMA driver.
4//
5// Copyright (c) 2016-2018 Socionext Inc.
6
7#include <linux/dma-mapping.h>
8#include <linux/errno.h>
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <sound/core.h>
12#include <sound/pcm.h>
13#include <sound/soc.h>
14
15#include "aio.h"
16
17static const struct snd_pcm_hardware uniphier_aiodma_hw = {
18 .info = SNDRV_PCM_INFO_MMAP |
19 SNDRV_PCM_INFO_MMAP_VALID |
20 SNDRV_PCM_INFO_INTERLEAVED,
21 .period_bytes_min = 256,
22 .period_bytes_max = 4096,
23 .periods_min = 4,
24 .periods_max = 1024,
25 .buffer_bytes_max = 128 * 1024,
26};
27
28static void aiodma_pcm_irq(struct uniphier_aio_sub *sub)
29{
30 struct snd_pcm_runtime *runtime = sub->substream->runtime;
31 int bytes = runtime->period_size *
32 runtime->channels * samples_to_bytes(runtime, size: 1);
33 int ret;
34
35 spin_lock(lock: &sub->lock);
36 ret = aiodma_rb_set_threshold(sub, size: runtime->dma_bytes,
37 th: sub->threshold + bytes);
38 if (!ret)
39 sub->threshold += bytes;
40
41 aiodma_rb_sync(sub, start: runtime->dma_addr, size: runtime->dma_bytes, period: bytes);
42 aiodma_rb_clear_irq(sub);
43 spin_unlock(lock: &sub->lock);
44
45 snd_pcm_period_elapsed(substream: sub->substream);
46}
47
48static void aiodma_compr_irq(struct uniphier_aio_sub *sub)
49{
50 struct snd_compr_runtime *runtime = sub->cstream->runtime;
51 int bytes = runtime->fragment_size;
52 int ret;
53
54 spin_lock(lock: &sub->lock);
55 ret = aiodma_rb_set_threshold(sub, size: sub->compr_bytes,
56 th: sub->threshold + bytes);
57 if (!ret)
58 sub->threshold += bytes;
59
60 aiodma_rb_sync(sub, start: sub->compr_addr, size: sub->compr_bytes, period: bytes);
61 aiodma_rb_clear_irq(sub);
62 spin_unlock(lock: &sub->lock);
63
64 snd_compr_fragment_elapsed(stream: sub->cstream);
65}
66
67static irqreturn_t aiodma_irq(int irq, void *p)
68{
69 struct platform_device *pdev = p;
70 struct uniphier_aio_chip *chip = platform_get_drvdata(pdev);
71 irqreturn_t ret = IRQ_NONE;
72 int i, j;
73
74 for (i = 0; i < chip->num_aios; i++) {
75 struct uniphier_aio *aio = &chip->aios[i];
76
77 for (j = 0; j < ARRAY_SIZE(aio->sub); j++) {
78 struct uniphier_aio_sub *sub = &aio->sub[j];
79
80 /* Skip channel that does not trigger */
81 if (!sub->running || !aiodma_rb_is_irq(sub))
82 continue;
83
84 if (sub->substream)
85 aiodma_pcm_irq(sub);
86 if (sub->cstream)
87 aiodma_compr_irq(sub);
88
89 ret = IRQ_HANDLED;
90 }
91 }
92
93 return ret;
94}
95
96static int uniphier_aiodma_open(struct snd_soc_component *component,
97 struct snd_pcm_substream *substream)
98{
99 struct snd_pcm_runtime *runtime = substream->runtime;
100
101 snd_soc_set_runtime_hwparams(substream, hw: &uniphier_aiodma_hw);
102
103 return snd_pcm_hw_constraint_step(runtime, cond: 0,
104 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, step: 256);
105}
106
107static int uniphier_aiodma_prepare(struct snd_soc_component *component,
108 struct snd_pcm_substream *substream)
109{
110 struct snd_pcm_runtime *runtime = substream->runtime;
111 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
112 struct uniphier_aio *aio = uniphier_priv(snd_soc_rtd_to_cpu(rtd, 0));
113 struct uniphier_aio_sub *sub = &aio->sub[substream->stream];
114 int bytes = runtime->period_size *
115 runtime->channels * samples_to_bytes(runtime, size: 1);
116 unsigned long flags;
117 int ret;
118
119 ret = aiodma_ch_set_param(sub);
120 if (ret)
121 return ret;
122
123 spin_lock_irqsave(&sub->lock, flags);
124 ret = aiodma_rb_set_buffer(sub, start: runtime->dma_addr,
125 end: runtime->dma_addr + runtime->dma_bytes,
126 period: bytes);
127 spin_unlock_irqrestore(lock: &sub->lock, flags);
128 if (ret)
129 return ret;
130
131 return 0;
132}
133
134static int uniphier_aiodma_trigger(struct snd_soc_component *component,
135 struct snd_pcm_substream *substream, int cmd)
136{
137 struct snd_pcm_runtime *runtime = substream->runtime;
138 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
139 struct uniphier_aio *aio = uniphier_priv(snd_soc_rtd_to_cpu(rtd, 0));
140 struct uniphier_aio_sub *sub = &aio->sub[substream->stream];
141 struct device *dev = &aio->chip->pdev->dev;
142 int bytes = runtime->period_size *
143 runtime->channels * samples_to_bytes(runtime, size: 1);
144 unsigned long flags;
145
146 spin_lock_irqsave(&sub->lock, flags);
147 switch (cmd) {
148 case SNDRV_PCM_TRIGGER_START:
149 aiodma_rb_sync(sub, start: runtime->dma_addr, size: runtime->dma_bytes,
150 period: bytes);
151 aiodma_ch_set_enable(sub, enable: 1);
152 sub->running = 1;
153
154 break;
155 case SNDRV_PCM_TRIGGER_STOP:
156 sub->running = 0;
157 aiodma_ch_set_enable(sub, enable: 0);
158
159 break;
160 default:
161 dev_warn(dev, "Unknown trigger(%d) ignored\n", cmd);
162 break;
163 }
164 spin_unlock_irqrestore(lock: &sub->lock, flags);
165
166 return 0;
167}
168
169static snd_pcm_uframes_t uniphier_aiodma_pointer(
170 struct snd_soc_component *component,
171 struct snd_pcm_substream *substream)
172{
173 struct snd_pcm_runtime *runtime = substream->runtime;
174 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
175 struct uniphier_aio *aio = uniphier_priv(snd_soc_rtd_to_cpu(rtd, 0));
176 struct uniphier_aio_sub *sub = &aio->sub[substream->stream];
177 int bytes = runtime->period_size *
178 runtime->channels * samples_to_bytes(runtime, size: 1);
179 unsigned long flags;
180 snd_pcm_uframes_t pos;
181
182 spin_lock_irqsave(&sub->lock, flags);
183 aiodma_rb_sync(sub, start: runtime->dma_addr, size: runtime->dma_bytes, period: bytes);
184
185 if (sub->swm->dir == PORT_DIR_OUTPUT)
186 pos = bytes_to_frames(runtime, size: sub->rd_offs);
187 else
188 pos = bytes_to_frames(runtime, size: sub->wr_offs);
189 spin_unlock_irqrestore(lock: &sub->lock, flags);
190
191 return pos;
192}
193
194static int uniphier_aiodma_mmap(struct snd_soc_component *component,
195 struct snd_pcm_substream *substream,
196 struct vm_area_struct *vma)
197{
198 vma->vm_page_prot = pgprot_writecombine(prot: vma->vm_page_prot);
199
200 return remap_pfn_range(vma, addr: vma->vm_start,
201 pfn: substream->runtime->dma_addr >> PAGE_SHIFT,
202 size: vma->vm_end - vma->vm_start, pgprot: vma->vm_page_prot);
203}
204
205static int uniphier_aiodma_new(struct snd_soc_component *component,
206 struct snd_soc_pcm_runtime *rtd)
207{
208 struct device *dev = rtd->card->snd_card->dev;
209 struct snd_pcm *pcm = rtd->pcm;
210 int ret;
211
212 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(33));
213 if (ret)
214 return ret;
215
216 snd_pcm_set_managed_buffer_all(pcm,
217 SNDRV_DMA_TYPE_DEV, data: dev,
218 size: uniphier_aiodma_hw.buffer_bytes_max,
219 max: uniphier_aiodma_hw.buffer_bytes_max);
220 return 0;
221}
222
223static const struct snd_soc_component_driver uniphier_soc_platform = {
224 .open = uniphier_aiodma_open,
225 .prepare = uniphier_aiodma_prepare,
226 .trigger = uniphier_aiodma_trigger,
227 .pointer = uniphier_aiodma_pointer,
228 .mmap = uniphier_aiodma_mmap,
229 .pcm_construct = uniphier_aiodma_new,
230 .compress_ops = &uniphier_aio_compress_ops,
231};
232
233static const struct regmap_config aiodma_regmap_config = {
234 .reg_bits = 32,
235 .reg_stride = 4,
236 .val_bits = 32,
237 .max_register = 0x7fffc,
238 .cache_type = REGCACHE_NONE,
239};
240
241/**
242 * uniphier_aiodma_soc_register_platform - register the AIO DMA
243 * @pdev: the platform device
244 *
245 * Register and setup the DMA of AIO to transfer the sound data to device.
246 * This function need to call once at driver startup and need NOT to call
247 * unregister function.
248 *
249 * Return: Zero if successful, otherwise a negative value on error.
250 */
251int uniphier_aiodma_soc_register_platform(struct platform_device *pdev)
252{
253 struct uniphier_aio_chip *chip = platform_get_drvdata(pdev);
254 struct device *dev = &pdev->dev;
255 void __iomem *preg;
256 int irq, ret;
257
258 preg = devm_platform_ioremap_resource(pdev, index: 0);
259 if (IS_ERR(ptr: preg))
260 return PTR_ERR(ptr: preg);
261
262 chip->regmap = devm_regmap_init_mmio(dev, preg,
263 &aiodma_regmap_config);
264 if (IS_ERR(ptr: chip->regmap))
265 return PTR_ERR(ptr: chip->regmap);
266
267 irq = platform_get_irq(pdev, 0);
268 if (irq < 0)
269 return irq;
270
271 ret = devm_request_irq(dev, irq, handler: aiodma_irq,
272 IRQF_SHARED, devname: dev_name(dev), dev_id: pdev);
273 if (ret)
274 return ret;
275
276 return devm_snd_soc_register_component(dev, component_driver: &uniphier_soc_platform,
277 NULL, num_dai: 0);
278}
279EXPORT_SYMBOL_GPL(uniphier_aiodma_soc_register_platform);
280

source code of linux/sound/soc/uniphier/aio-dma.c