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Linux/sound/soc/dwc/dwc-pcm.c

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  1 /*
  2  * ALSA SoC Synopsys PIO PCM for I2S driver
  3  *
  4  * sound/soc/dwc/designware_pcm.c
  5  *
  6  * Copyright (C) 2016 Synopsys
  7  * Jose Abreu <joabreu@synopsys.com>
  8  *
  9  * This file is licensed under the terms of the GNU General Public
 10  * License version 2. This program is licensed "as is" without any
 11  * warranty of any kind, whether express or implied.
 12  */
 13 
 14 #include <linux/io.h>
 15 #include <linux/rcupdate.h>
 16 #include <sound/pcm.h>
 17 #include <sound/pcm_params.h>
 18 #include "local.h"
 19 
 20 #define BUFFER_BYTES_MAX        (3 * 2 * 8 * PERIOD_BYTES_MIN)
 21 #define PERIOD_BYTES_MIN        4096
 22 #define PERIODS_MIN             2
 23 
 24 #define dw_pcm_tx_fn(sample_bits) \
 25 static unsigned int dw_pcm_tx_##sample_bits(struct dw_i2s_dev *dev, \
 26                 struct snd_pcm_runtime *runtime, unsigned int tx_ptr, \
 27                 bool *period_elapsed) \
 28 { \
 29         const u##sample_bits (*p)[2] = (void *)runtime->dma_area; \
 30         unsigned int period_pos = tx_ptr % runtime->period_size; \
 31         int i; \
 32 \
 33         for (i = 0; i < dev->fifo_th; i++) { \
 34                 iowrite32(p[tx_ptr][0], dev->i2s_base + LRBR_LTHR(0)); \
 35                 iowrite32(p[tx_ptr][1], dev->i2s_base + RRBR_RTHR(0)); \
 36                 period_pos++; \
 37                 if (++tx_ptr >= runtime->buffer_size) \
 38                         tx_ptr = 0; \
 39         } \
 40         *period_elapsed = period_pos >= runtime->period_size; \
 41         return tx_ptr; \
 42 }
 43 
 44 #define dw_pcm_rx_fn(sample_bits) \
 45 static unsigned int dw_pcm_rx_##sample_bits(struct dw_i2s_dev *dev, \
 46                 struct snd_pcm_runtime *runtime, unsigned int rx_ptr, \
 47                 bool *period_elapsed) \
 48 { \
 49         u##sample_bits (*p)[2] = (void *)runtime->dma_area; \
 50         unsigned int period_pos = rx_ptr % runtime->period_size; \
 51         int i; \
 52 \
 53         for (i = 0; i < dev->fifo_th; i++) { \
 54                 p[rx_ptr][0] = ioread32(dev->i2s_base + LRBR_LTHR(0)); \
 55                 p[rx_ptr][1] = ioread32(dev->i2s_base + RRBR_RTHR(0)); \
 56                 period_pos++; \
 57                 if (++rx_ptr >= runtime->buffer_size) \
 58                         rx_ptr = 0; \
 59         } \
 60         *period_elapsed = period_pos >= runtime->period_size; \
 61         return rx_ptr; \
 62 }
 63 
 64 dw_pcm_tx_fn(16);
 65 dw_pcm_tx_fn(32);
 66 dw_pcm_rx_fn(16);
 67 dw_pcm_rx_fn(32);
 68 
 69 #undef dw_pcm_tx_fn
 70 #undef dw_pcm_rx_fn
 71 
 72 static const struct snd_pcm_hardware dw_pcm_hardware = {
 73         .info = SNDRV_PCM_INFO_INTERLEAVED |
 74                 SNDRV_PCM_INFO_MMAP |
 75                 SNDRV_PCM_INFO_MMAP_VALID |
 76                 SNDRV_PCM_INFO_BLOCK_TRANSFER,
 77         .rates = SNDRV_PCM_RATE_32000 |
 78                 SNDRV_PCM_RATE_44100 |
 79                 SNDRV_PCM_RATE_48000,
 80         .rate_min = 32000,
 81         .rate_max = 48000,
 82         .formats = SNDRV_PCM_FMTBIT_S16_LE |
 83                 SNDRV_PCM_FMTBIT_S24_LE |
 84                 SNDRV_PCM_FMTBIT_S32_LE,
 85         .channels_min = 2,
 86         .channels_max = 2,
 87         .buffer_bytes_max = BUFFER_BYTES_MAX,
 88         .period_bytes_min = PERIOD_BYTES_MIN,
 89         .period_bytes_max = BUFFER_BYTES_MAX / PERIODS_MIN,
 90         .periods_min = PERIODS_MIN,
 91         .periods_max = BUFFER_BYTES_MAX / PERIOD_BYTES_MIN,
 92         .fifo_size = 16,
 93 };
 94 
 95 static void dw_pcm_transfer(struct dw_i2s_dev *dev, bool push)
 96 {
 97         struct snd_pcm_substream *substream;
 98         bool active, period_elapsed;
 99 
100         rcu_read_lock();
101         if (push)
102                 substream = rcu_dereference(dev->tx_substream);
103         else
104                 substream = rcu_dereference(dev->rx_substream);
105         active = substream && snd_pcm_running(substream);
106         if (active) {
107                 unsigned int ptr;
108                 unsigned int new_ptr;
109 
110                 if (push) {
111                         ptr = READ_ONCE(dev->tx_ptr);
112                         new_ptr = dev->tx_fn(dev, substream->runtime, ptr,
113                                         &period_elapsed);
114                         cmpxchg(&dev->tx_ptr, ptr, new_ptr);
115                 } else {
116                         ptr = READ_ONCE(dev->rx_ptr);
117                         new_ptr = dev->rx_fn(dev, substream->runtime, ptr,
118                                         &period_elapsed);
119                         cmpxchg(&dev->rx_ptr, ptr, new_ptr);
120                 }
121 
122                 if (period_elapsed)
123                         snd_pcm_period_elapsed(substream);
124         }
125         rcu_read_unlock();
126 }
127 
128 void dw_pcm_push_tx(struct dw_i2s_dev *dev)
129 {
130         dw_pcm_transfer(dev, true);
131 }
132 
133 void dw_pcm_pop_rx(struct dw_i2s_dev *dev)
134 {
135         dw_pcm_transfer(dev, false);
136 }
137 
138 static int dw_pcm_open(struct snd_pcm_substream *substream)
139 {
140         struct snd_pcm_runtime *runtime = substream->runtime;
141         struct snd_soc_pcm_runtime *rtd = substream->private_data;
142         struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(rtd->cpu_dai);
143 
144         snd_soc_set_runtime_hwparams(substream, &dw_pcm_hardware);
145         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
146         runtime->private_data = dev;
147 
148         return 0;
149 }
150 
151 static int dw_pcm_close(struct snd_pcm_substream *substream)
152 {
153         synchronize_rcu();
154         return 0;
155 }
156 
157 static int dw_pcm_hw_params(struct snd_pcm_substream *substream,
158                 struct snd_pcm_hw_params *hw_params)
159 {
160         struct snd_pcm_runtime *runtime = substream->runtime;
161         struct dw_i2s_dev *dev = runtime->private_data;
162         int ret;
163 
164         switch (params_channels(hw_params)) {
165         case 2:
166                 break;
167         default:
168                 dev_err(dev->dev, "invalid channels number\n");
169                 return -EINVAL;
170         }
171 
172         switch (params_format(hw_params)) {
173         case SNDRV_PCM_FORMAT_S16_LE:
174                 dev->tx_fn = dw_pcm_tx_16;
175                 dev->rx_fn = dw_pcm_rx_16;
176                 break;
177         case SNDRV_PCM_FORMAT_S24_LE:
178         case SNDRV_PCM_FORMAT_S32_LE:
179                 dev->tx_fn = dw_pcm_tx_32;
180                 dev->rx_fn = dw_pcm_rx_32;
181                 break;
182         default:
183                 dev_err(dev->dev, "invalid format\n");
184                 return -EINVAL;
185         }
186 
187         ret = snd_pcm_lib_malloc_pages(substream,
188                         params_buffer_bytes(hw_params));
189         if (ret < 0)
190                 return ret;
191         else
192                 return 0;
193 }
194 
195 static int dw_pcm_hw_free(struct snd_pcm_substream *substream)
196 {
197         return snd_pcm_lib_free_pages(substream);
198 }
199 
200 static int dw_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
201 {
202         struct snd_pcm_runtime *runtime = substream->runtime;
203         struct dw_i2s_dev *dev = runtime->private_data;
204         int ret = 0;
205 
206         switch (cmd) {
207         case SNDRV_PCM_TRIGGER_START:
208         case SNDRV_PCM_TRIGGER_RESUME:
209         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
210                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
211                         WRITE_ONCE(dev->tx_ptr, 0);
212                         rcu_assign_pointer(dev->tx_substream, substream);
213                 } else {
214                         WRITE_ONCE(dev->rx_ptr, 0);
215                         rcu_assign_pointer(dev->rx_substream, substream);
216                 }
217                 break;
218         case SNDRV_PCM_TRIGGER_STOP:
219         case SNDRV_PCM_TRIGGER_SUSPEND:
220         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
221                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
222                         rcu_assign_pointer(dev->tx_substream, NULL);
223                 else
224                         rcu_assign_pointer(dev->rx_substream, NULL);
225                 break;
226         default:
227                 ret = -EINVAL;
228                 break;
229         }
230 
231         return ret;
232 }
233 
234 static snd_pcm_uframes_t dw_pcm_pointer(struct snd_pcm_substream *substream)
235 {
236         struct snd_pcm_runtime *runtime = substream->runtime;
237         struct dw_i2s_dev *dev = runtime->private_data;
238         snd_pcm_uframes_t pos;
239 
240         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
241                 pos = READ_ONCE(dev->tx_ptr);
242         else
243                 pos = READ_ONCE(dev->rx_ptr);
244 
245         return pos < runtime->buffer_size ? pos : 0;
246 }
247 
248 static int dw_pcm_new(struct snd_soc_pcm_runtime *rtd)
249 {
250         size_t size = dw_pcm_hardware.buffer_bytes_max;
251 
252         return snd_pcm_lib_preallocate_pages_for_all(rtd->pcm,
253                         SNDRV_DMA_TYPE_CONTINUOUS,
254                         snd_dma_continuous_data(GFP_KERNEL), size, size);
255 }
256 
257 static void dw_pcm_free(struct snd_pcm *pcm)
258 {
259         snd_pcm_lib_preallocate_free_for_all(pcm);
260 }
261 
262 static const struct snd_pcm_ops dw_pcm_ops = {
263         .open = dw_pcm_open,
264         .close = dw_pcm_close,
265         .ioctl = snd_pcm_lib_ioctl,
266         .hw_params = dw_pcm_hw_params,
267         .hw_free = dw_pcm_hw_free,
268         .trigger = dw_pcm_trigger,
269         .pointer = dw_pcm_pointer,
270 };
271 
272 static const struct snd_soc_component_driver dw_pcm_component = {
273         .pcm_new = dw_pcm_new,
274         .pcm_free = dw_pcm_free,
275         .ops = &dw_pcm_ops,
276 };
277 
278 int dw_pcm_register(struct platform_device *pdev)
279 {
280         return devm_snd_soc_register_component(&pdev->dev, &dw_pcm_component,
281                                                NULL, 0);
282 }
283 

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