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88740da1 CC |
1 | /* |
2 | * File: sound/soc/blackfin/bf5xx-i2s-pcm.c | |
3 | * Author: Cliff Cai <Cliff.Cai@analog.com> | |
4 | * | |
5 | * Created: Tue June 06 2008 | |
6 | * Description: DMA driver for i2s codec | |
7 | * | |
8 | * Modified: | |
9 | * Copyright 2008 Analog Devices Inc. | |
10 | * | |
11 | * Bugs: Enter bugs at http://blackfin.uclinux.org/ | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or | |
16 | * (at your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with this program; if not, see the file COPYING, or write | |
25 | * to the Free Software Foundation, Inc., | |
26 | * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
27 | */ | |
28 | ||
29 | #include <linux/module.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/platform_device.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/dma-mapping.h> | |
34 | ||
35 | #include <sound/core.h> | |
36 | #include <sound/pcm.h> | |
37 | #include <sound/pcm_params.h> | |
38 | #include <sound/soc.h> | |
39 | ||
40 | #include <asm/dma.h> | |
41 | ||
42 | #include "bf5xx-i2s-pcm.h" | |
43 | #include "bf5xx-i2s.h" | |
44 | #include "bf5xx-sport.h" | |
45 | ||
46 | static void bf5xx_dma_irq(void *data) | |
47 | { | |
48 | struct snd_pcm_substream *pcm = data; | |
49 | snd_pcm_period_elapsed(pcm); | |
50 | } | |
51 | ||
52 | static const struct snd_pcm_hardware bf5xx_pcm_hardware = { | |
53 | .info = SNDRV_PCM_INFO_INTERLEAVED | | |
54 | SNDRV_PCM_INFO_MMAP | | |
55 | SNDRV_PCM_INFO_MMAP_VALID | | |
56 | SNDRV_PCM_INFO_BLOCK_TRANSFER, | |
57 | .formats = SNDRV_PCM_FMTBIT_S16_LE | | |
58 | SNDRV_PCM_FMTBIT_S24_LE | | |
59 | SNDRV_PCM_FMTBIT_S32_LE, | |
60 | .period_bytes_min = 32, | |
61 | .period_bytes_max = 0x10000, | |
62 | .periods_min = 1, | |
63 | .periods_max = PAGE_SIZE/32, | |
64 | .buffer_bytes_max = 0x20000, /* 128 kbytes */ | |
65 | .fifo_size = 16, | |
66 | }; | |
67 | ||
68 | static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream, | |
69 | struct snd_pcm_hw_params *params) | |
70 | { | |
71 | size_t size = bf5xx_pcm_hardware.buffer_bytes_max; | |
72 | snd_pcm_lib_malloc_pages(substream, size); | |
73 | ||
74 | return 0; | |
75 | } | |
76 | ||
77 | static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream) | |
78 | { | |
79 | snd_pcm_lib_free_pages(substream); | |
80 | ||
81 | return 0; | |
82 | } | |
83 | ||
84 | static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream) | |
85 | { | |
86 | struct snd_pcm_runtime *runtime = substream->runtime; | |
87 | struct sport_device *sport = runtime->private_data; | |
88 | int period_bytes = frames_to_bytes(runtime, runtime->period_size); | |
89 | ||
90 | pr_debug("%s enter\n", __func__); | |
91 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
92 | sport_set_tx_callback(sport, bf5xx_dma_irq, substream); | |
93 | sport_config_tx_dma(sport, runtime->dma_area, | |
94 | runtime->periods, period_bytes); | |
95 | } else { | |
96 | sport_set_rx_callback(sport, bf5xx_dma_irq, substream); | |
97 | sport_config_rx_dma(sport, runtime->dma_area, | |
98 | runtime->periods, period_bytes); | |
99 | } | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
104 | static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
105 | { | |
106 | struct snd_pcm_runtime *runtime = substream->runtime; | |
107 | struct sport_device *sport = runtime->private_data; | |
108 | int ret = 0; | |
109 | ||
110 | pr_debug("%s enter\n", __func__); | |
111 | switch (cmd) { | |
112 | case SNDRV_PCM_TRIGGER_START: | |
113 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
114 | sport_tx_start(sport); | |
115 | else | |
116 | sport_rx_start(sport); | |
117 | break; | |
118 | case SNDRV_PCM_TRIGGER_STOP: | |
119 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
120 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
121 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
122 | sport_tx_stop(sport); | |
123 | else | |
124 | sport_rx_stop(sport); | |
125 | break; | |
126 | default: | |
127 | ret = -EINVAL; | |
128 | } | |
129 | ||
130 | return ret; | |
131 | } | |
132 | ||
133 | static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream) | |
134 | { | |
135 | struct snd_pcm_runtime *runtime = substream->runtime; | |
136 | struct sport_device *sport = runtime->private_data; | |
137 | unsigned int diff; | |
138 | snd_pcm_uframes_t frames; | |
139 | pr_debug("%s enter\n", __func__); | |
140 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
141 | diff = sport_curr_offset_tx(sport); | |
142 | frames = bytes_to_frames(substream->runtime, diff); | |
143 | } else { | |
144 | diff = sport_curr_offset_rx(sport); | |
145 | frames = bytes_to_frames(substream->runtime, diff); | |
146 | } | |
147 | return frames; | |
148 | } | |
149 | ||
150 | static int bf5xx_pcm_open(struct snd_pcm_substream *substream) | |
151 | { | |
152 | struct snd_pcm_runtime *runtime = substream->runtime; | |
153 | int ret; | |
154 | ||
155 | pr_debug("%s enter\n", __func__); | |
156 | snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware); | |
157 | ||
158 | ret = snd_pcm_hw_constraint_integer(runtime, \ | |
159 | SNDRV_PCM_HW_PARAM_PERIODS); | |
160 | if (ret < 0) | |
161 | goto out; | |
162 | ||
163 | if (sport_handle != NULL) | |
164 | runtime->private_data = sport_handle; | |
165 | else { | |
166 | pr_err("sport_handle is NULL\n"); | |
167 | return -1; | |
168 | } | |
169 | return 0; | |
170 | ||
171 | out: | |
172 | return ret; | |
173 | } | |
174 | ||
175 | static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream, | |
176 | struct vm_area_struct *vma) | |
177 | { | |
178 | struct snd_pcm_runtime *runtime = substream->runtime; | |
179 | size_t size = vma->vm_end - vma->vm_start; | |
180 | vma->vm_start = (unsigned long)runtime->dma_area; | |
181 | vma->vm_end = vma->vm_start + size; | |
182 | vma->vm_flags |= VM_SHARED; | |
183 | ||
184 | return 0 ; | |
185 | } | |
186 | ||
187 | struct snd_pcm_ops bf5xx_pcm_i2s_ops = { | |
188 | .open = bf5xx_pcm_open, | |
189 | .ioctl = snd_pcm_lib_ioctl, | |
190 | .hw_params = bf5xx_pcm_hw_params, | |
191 | .hw_free = bf5xx_pcm_hw_free, | |
192 | .prepare = bf5xx_pcm_prepare, | |
193 | .trigger = bf5xx_pcm_trigger, | |
194 | .pointer = bf5xx_pcm_pointer, | |
195 | .mmap = bf5xx_pcm_mmap, | |
196 | }; | |
197 | ||
198 | static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) | |
199 | { | |
200 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; | |
201 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
202 | size_t size = bf5xx_pcm_hardware.buffer_bytes_max; | |
203 | ||
204 | buf->dev.type = SNDRV_DMA_TYPE_DEV; | |
205 | buf->dev.dev = pcm->card->dev; | |
206 | buf->private_data = NULL; | |
207 | buf->area = dma_alloc_coherent(pcm->card->dev, size, | |
208 | &buf->addr, GFP_KERNEL); | |
209 | if (!buf->area) { | |
210 | pr_err("Failed to allocate dma memory \ | |
211 | Please increase uncached DMA memory region\n"); | |
212 | return -ENOMEM; | |
213 | } | |
214 | buf->bytes = size; | |
215 | ||
216 | pr_debug("%s, area:%p, size:0x%08lx\n", __func__, | |
217 | buf->area, buf->bytes); | |
218 | ||
219 | if (stream == SNDRV_PCM_STREAM_PLAYBACK) | |
220 | sport_handle->tx_buf = buf->area; | |
221 | else | |
222 | sport_handle->rx_buf = buf->area; | |
223 | ||
224 | return 0; | |
225 | } | |
226 | ||
227 | static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm) | |
228 | { | |
229 | struct snd_pcm_substream *substream; | |
230 | struct snd_dma_buffer *buf; | |
231 | int stream; | |
232 | ||
233 | for (stream = 0; stream < 2; stream++) { | |
234 | substream = pcm->streams[stream].substream; | |
235 | if (!substream) | |
236 | continue; | |
237 | ||
238 | buf = &substream->dma_buffer; | |
239 | if (!buf->area) | |
240 | continue; | |
241 | dma_free_coherent(NULL, buf->bytes, buf->area, 0); | |
242 | buf->area = NULL; | |
243 | } | |
244 | if (sport_handle) | |
245 | sport_done(sport_handle); | |
246 | } | |
247 | ||
248 | static u64 bf5xx_pcm_dmamask = DMA_32BIT_MASK; | |
249 | ||
250 | int bf5xx_pcm_i2s_new(struct snd_card *card, struct snd_soc_dai *dai, | |
251 | struct snd_pcm *pcm) | |
252 | { | |
253 | int ret = 0; | |
254 | ||
255 | pr_debug("%s enter\n", __func__); | |
256 | if (!card->dev->dma_mask) | |
257 | card->dev->dma_mask = &bf5xx_pcm_dmamask; | |
258 | if (!card->dev->coherent_dma_mask) | |
259 | card->dev->coherent_dma_mask = DMA_32BIT_MASK; | |
260 | ||
261 | if (dai->playback.channels_min) { | |
262 | ret = bf5xx_pcm_preallocate_dma_buffer(pcm, | |
263 | SNDRV_PCM_STREAM_PLAYBACK); | |
264 | if (ret) | |
265 | goto out; | |
266 | } | |
267 | ||
268 | if (dai->capture.channels_min) { | |
269 | ret = bf5xx_pcm_preallocate_dma_buffer(pcm, | |
270 | SNDRV_PCM_STREAM_CAPTURE); | |
271 | if (ret) | |
272 | goto out; | |
273 | } | |
274 | out: | |
275 | return ret; | |
276 | } | |
277 | ||
278 | struct snd_soc_platform bf5xx_i2s_soc_platform = { | |
279 | .name = "bf5xx-audio", | |
280 | .pcm_ops = &bf5xx_pcm_i2s_ops, | |
281 | .pcm_new = bf5xx_pcm_i2s_new, | |
282 | .pcm_free = bf5xx_pcm_free_dma_buffers, | |
283 | }; | |
284 | EXPORT_SYMBOL_GPL(bf5xx_i2s_soc_platform); | |
285 | ||
c9b3a40f | 286 | static int __init bfin_i2s_init(void) |
958e792c MB |
287 | { |
288 | return snd_soc_register_platform(&bf5xx_i2s_soc_platform); | |
289 | } | |
290 | module_init(bfin_i2s_init); | |
291 | ||
292 | static void __exit bfin_i2s_exit(void) | |
293 | { | |
294 | snd_soc_unregister_platform(&bf5xx_i2s_soc_platform); | |
295 | } | |
296 | module_exit(bfin_i2s_exit); | |
297 | ||
88740da1 CC |
298 | MODULE_AUTHOR("Cliff Cai"); |
299 | MODULE_DESCRIPTION("ADI Blackfin I2S PCM DMA module"); | |
300 | MODULE_LICENSE("GPL"); |