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79361b2b JA |
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 | dw_pcm_tx_fn(16); | |
45 | dw_pcm_tx_fn(32); | |
46 | ||
47 | #undef dw_pcm_tx_fn | |
48 | ||
49 | static const struct snd_pcm_hardware dw_pcm_hardware = { | |
50 | .info = SNDRV_PCM_INFO_INTERLEAVED | | |
51 | SNDRV_PCM_INFO_MMAP | | |
52 | SNDRV_PCM_INFO_MMAP_VALID | | |
53 | SNDRV_PCM_INFO_BLOCK_TRANSFER, | |
54 | .rates = SNDRV_PCM_RATE_32000 | | |
55 | SNDRV_PCM_RATE_44100 | | |
56 | SNDRV_PCM_RATE_48000, | |
57 | .rate_min = 32000, | |
58 | .rate_max = 48000, | |
59 | .formats = SNDRV_PCM_FMTBIT_S16_LE | | |
60 | SNDRV_PCM_FMTBIT_S32_LE, | |
61 | .channels_min = 2, | |
62 | .channels_max = 2, | |
63 | .buffer_bytes_max = BUFFER_BYTES_MAX, | |
64 | .period_bytes_min = PERIOD_BYTES_MIN, | |
65 | .period_bytes_max = BUFFER_BYTES_MAX / PERIODS_MIN, | |
66 | .periods_min = PERIODS_MIN, | |
67 | .periods_max = BUFFER_BYTES_MAX / PERIOD_BYTES_MIN, | |
68 | .fifo_size = 16, | |
69 | }; | |
70 | ||
71 | void dw_pcm_push_tx(struct dw_i2s_dev *dev) | |
72 | { | |
73 | struct snd_pcm_substream *tx_substream; | |
74 | bool tx_active, period_elapsed; | |
75 | ||
76 | rcu_read_lock(); | |
77 | tx_substream = rcu_dereference(dev->tx_substream); | |
78 | tx_active = tx_substream && snd_pcm_running(tx_substream); | |
79 | if (tx_active) { | |
80 | unsigned int tx_ptr = READ_ONCE(dev->tx_ptr); | |
81 | unsigned int new_tx_ptr = dev->tx_fn(dev, tx_substream->runtime, | |
82 | tx_ptr, &period_elapsed); | |
83 | cmpxchg(&dev->tx_ptr, tx_ptr, new_tx_ptr); | |
84 | ||
85 | if (period_elapsed) | |
86 | snd_pcm_period_elapsed(tx_substream); | |
87 | } | |
88 | rcu_read_unlock(); | |
89 | } | |
90 | EXPORT_SYMBOL_GPL(dw_pcm_push_tx); | |
91 | ||
92 | static int dw_pcm_open(struct snd_pcm_substream *substream) | |
93 | { | |
94 | struct snd_pcm_runtime *runtime = substream->runtime; | |
95 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
96 | struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(rtd->cpu_dai); | |
97 | ||
98 | snd_soc_set_runtime_hwparams(substream, &dw_pcm_hardware); | |
99 | snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); | |
100 | runtime->private_data = dev; | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
105 | static int dw_pcm_close(struct snd_pcm_substream *substream) | |
106 | { | |
107 | synchronize_rcu(); | |
108 | return 0; | |
109 | } | |
110 | ||
111 | static int dw_pcm_hw_params(struct snd_pcm_substream *substream, | |
112 | struct snd_pcm_hw_params *hw_params) | |
113 | { | |
114 | struct snd_pcm_runtime *runtime = substream->runtime; | |
115 | struct dw_i2s_dev *dev = runtime->private_data; | |
116 | int ret; | |
117 | ||
118 | switch (params_channels(hw_params)) { | |
119 | case 2: | |
120 | break; | |
121 | default: | |
122 | dev_err(dev->dev, "invalid channels number\n"); | |
123 | return -EINVAL; | |
124 | } | |
125 | ||
126 | switch (params_format(hw_params)) { | |
127 | case SNDRV_PCM_FORMAT_S16_LE: | |
128 | dev->tx_fn = dw_pcm_tx_16; | |
129 | break; | |
130 | case SNDRV_PCM_FORMAT_S32_LE: | |
131 | dev->tx_fn = dw_pcm_tx_32; | |
132 | break; | |
133 | default: | |
134 | dev_err(dev->dev, "invalid format\n"); | |
135 | return -EINVAL; | |
136 | } | |
137 | ||
138 | if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK) { | |
139 | dev_err(dev->dev, "only playback is available\n"); | |
140 | return -EINVAL; | |
141 | } | |
142 | ||
143 | ret = snd_pcm_lib_malloc_pages(substream, | |
144 | params_buffer_bytes(hw_params)); | |
145 | if (ret < 0) | |
146 | return ret; | |
147 | else | |
148 | return 0; | |
149 | } | |
150 | ||
151 | static int dw_pcm_hw_free(struct snd_pcm_substream *substream) | |
152 | { | |
153 | return snd_pcm_lib_free_pages(substream); | |
154 | } | |
155 | ||
156 | static int dw_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
157 | { | |
158 | struct snd_pcm_runtime *runtime = substream->runtime; | |
159 | struct dw_i2s_dev *dev = runtime->private_data; | |
160 | int ret = 0; | |
161 | ||
162 | switch (cmd) { | |
163 | case SNDRV_PCM_TRIGGER_START: | |
164 | case SNDRV_PCM_TRIGGER_RESUME: | |
165 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
166 | WRITE_ONCE(dev->tx_ptr, 0); | |
167 | rcu_assign_pointer(dev->tx_substream, substream); | |
168 | break; | |
169 | case SNDRV_PCM_TRIGGER_STOP: | |
170 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
171 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
172 | rcu_assign_pointer(dev->tx_substream, NULL); | |
173 | break; | |
174 | default: | |
175 | ret = -EINVAL; | |
176 | break; | |
177 | } | |
178 | ||
179 | return ret; | |
180 | } | |
181 | ||
182 | static snd_pcm_uframes_t dw_pcm_pointer(struct snd_pcm_substream *substream) | |
183 | { | |
184 | struct snd_pcm_runtime *runtime = substream->runtime; | |
185 | struct dw_i2s_dev *dev = runtime->private_data; | |
186 | snd_pcm_uframes_t pos = READ_ONCE(dev->tx_ptr); | |
187 | ||
188 | return pos < runtime->buffer_size ? pos : 0; | |
189 | } | |
190 | ||
191 | static int dw_pcm_new(struct snd_soc_pcm_runtime *rtd) | |
192 | { | |
193 | size_t size = dw_pcm_hardware.buffer_bytes_max; | |
194 | ||
195 | return snd_pcm_lib_preallocate_pages_for_all(rtd->pcm, | |
196 | SNDRV_DMA_TYPE_CONTINUOUS, | |
197 | snd_dma_continuous_data(GFP_KERNEL), size, size); | |
198 | } | |
199 | ||
200 | static void dw_pcm_free(struct snd_pcm *pcm) | |
201 | { | |
202 | snd_pcm_lib_preallocate_free_for_all(pcm); | |
203 | } | |
204 | ||
205 | static const struct snd_pcm_ops dw_pcm_ops = { | |
206 | .open = dw_pcm_open, | |
207 | .close = dw_pcm_close, | |
208 | .ioctl = snd_pcm_lib_ioctl, | |
209 | .hw_params = dw_pcm_hw_params, | |
210 | .hw_free = dw_pcm_hw_free, | |
211 | .trigger = dw_pcm_trigger, | |
212 | .pointer = dw_pcm_pointer, | |
213 | }; | |
214 | ||
215 | static const struct snd_soc_platform_driver dw_pcm_platform = { | |
216 | .pcm_new = dw_pcm_new, | |
217 | .pcm_free = dw_pcm_free, | |
218 | .ops = &dw_pcm_ops, | |
219 | }; | |
220 | ||
221 | int dw_pcm_register(struct platform_device *pdev) | |
222 | { | |
223 | return devm_snd_soc_register_platform(&pdev->dev, &dw_pcm_platform); | |
224 | } | |
225 | EXPORT_SYMBOL_GPL(dw_pcm_register); |