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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> | |
88740da1 | 32 | #include <linux/dma-mapping.h> |
5a0e3ad6 | 33 | #include <linux/gfp.h> |
88740da1 CC |
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" | |
88740da1 CC |
43 | #include "bf5xx-sport.h" |
44 | ||
45 | static void bf5xx_dma_irq(void *data) | |
46 | { | |
47 | struct snd_pcm_substream *pcm = data; | |
48 | snd_pcm_period_elapsed(pcm); | |
49 | } | |
50 | ||
51 | static const struct snd_pcm_hardware bf5xx_pcm_hardware = { | |
52 | .info = SNDRV_PCM_INFO_INTERLEAVED | | |
53 | SNDRV_PCM_INFO_MMAP | | |
54 | SNDRV_PCM_INFO_MMAP_VALID | | |
55 | SNDRV_PCM_INFO_BLOCK_TRANSFER, | |
56 | .formats = SNDRV_PCM_FMTBIT_S16_LE | | |
57 | SNDRV_PCM_FMTBIT_S24_LE | | |
58 | SNDRV_PCM_FMTBIT_S32_LE, | |
59 | .period_bytes_min = 32, | |
60 | .period_bytes_max = 0x10000, | |
61 | .periods_min = 1, | |
62 | .periods_max = PAGE_SIZE/32, | |
63 | .buffer_bytes_max = 0x20000, /* 128 kbytes */ | |
64 | .fifo_size = 16, | |
65 | }; | |
66 | ||
67 | static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream, | |
68 | struct snd_pcm_hw_params *params) | |
69 | { | |
70 | size_t size = bf5xx_pcm_hardware.buffer_bytes_max; | |
71 | snd_pcm_lib_malloc_pages(substream, size); | |
72 | ||
73 | return 0; | |
74 | } | |
75 | ||
76 | static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream) | |
77 | { | |
78 | snd_pcm_lib_free_pages(substream); | |
79 | ||
80 | return 0; | |
81 | } | |
82 | ||
83 | static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream) | |
84 | { | |
85 | struct snd_pcm_runtime *runtime = substream->runtime; | |
86 | struct sport_device *sport = runtime->private_data; | |
87 | int period_bytes = frames_to_bytes(runtime, runtime->period_size); | |
88 | ||
89 | pr_debug("%s enter\n", __func__); | |
90 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
91 | sport_set_tx_callback(sport, bf5xx_dma_irq, substream); | |
92 | sport_config_tx_dma(sport, runtime->dma_area, | |
93 | runtime->periods, period_bytes); | |
94 | } else { | |
95 | sport_set_rx_callback(sport, bf5xx_dma_irq, substream); | |
96 | sport_config_rx_dma(sport, runtime->dma_area, | |
97 | runtime->periods, period_bytes); | |
98 | } | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
103 | static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
104 | { | |
105 | struct snd_pcm_runtime *runtime = substream->runtime; | |
106 | struct sport_device *sport = runtime->private_data; | |
107 | int ret = 0; | |
108 | ||
109 | pr_debug("%s enter\n", __func__); | |
110 | switch (cmd) { | |
111 | case SNDRV_PCM_TRIGGER_START: | |
112 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
113 | sport_tx_start(sport); | |
114 | else | |
115 | sport_rx_start(sport); | |
116 | break; | |
117 | case SNDRV_PCM_TRIGGER_STOP: | |
118 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
119 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
120 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
121 | sport_tx_stop(sport); | |
122 | else | |
123 | sport_rx_stop(sport); | |
124 | break; | |
125 | default: | |
126 | ret = -EINVAL; | |
127 | } | |
128 | ||
129 | return ret; | |
130 | } | |
131 | ||
132 | static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream) | |
133 | { | |
134 | struct snd_pcm_runtime *runtime = substream->runtime; | |
135 | struct sport_device *sport = runtime->private_data; | |
136 | unsigned int diff; | |
137 | snd_pcm_uframes_t frames; | |
138 | pr_debug("%s enter\n", __func__); | |
139 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
140 | diff = sport_curr_offset_tx(sport); | |
141 | frames = bytes_to_frames(substream->runtime, diff); | |
142 | } else { | |
143 | diff = sport_curr_offset_rx(sport); | |
144 | frames = bytes_to_frames(substream->runtime, diff); | |
145 | } | |
146 | return frames; | |
147 | } | |
148 | ||
149 | static int bf5xx_pcm_open(struct snd_pcm_substream *substream) | |
150 | { | |
151 | struct snd_pcm_runtime *runtime = substream->runtime; | |
152 | int ret; | |
153 | ||
154 | pr_debug("%s enter\n", __func__); | |
155 | snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware); | |
156 | ||
157 | ret = snd_pcm_hw_constraint_integer(runtime, \ | |
158 | SNDRV_PCM_HW_PARAM_PERIODS); | |
159 | if (ret < 0) | |
160 | goto out; | |
161 | ||
162 | if (sport_handle != NULL) | |
163 | runtime->private_data = sport_handle; | |
164 | else { | |
165 | pr_err("sport_handle is NULL\n"); | |
166 | return -1; | |
167 | } | |
168 | return 0; | |
169 | ||
170 | out: | |
171 | return ret; | |
172 | } | |
173 | ||
174 | static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream, | |
175 | struct vm_area_struct *vma) | |
176 | { | |
177 | struct snd_pcm_runtime *runtime = substream->runtime; | |
178 | size_t size = vma->vm_end - vma->vm_start; | |
179 | vma->vm_start = (unsigned long)runtime->dma_area; | |
180 | vma->vm_end = vma->vm_start + size; | |
181 | vma->vm_flags |= VM_SHARED; | |
182 | ||
183 | return 0 ; | |
184 | } | |
185 | ||
b2a19d02 | 186 | static struct snd_pcm_ops bf5xx_pcm_i2s_ops = { |
88740da1 CC |
187 | .open = bf5xx_pcm_open, |
188 | .ioctl = snd_pcm_lib_ioctl, | |
189 | .hw_params = bf5xx_pcm_hw_params, | |
190 | .hw_free = bf5xx_pcm_hw_free, | |
191 | .prepare = bf5xx_pcm_prepare, | |
192 | .trigger = bf5xx_pcm_trigger, | |
193 | .pointer = bf5xx_pcm_pointer, | |
194 | .mmap = bf5xx_pcm_mmap, | |
195 | }; | |
196 | ||
197 | static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) | |
198 | { | |
199 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; | |
200 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
201 | size_t size = bf5xx_pcm_hardware.buffer_bytes_max; | |
202 | ||
203 | buf->dev.type = SNDRV_DMA_TYPE_DEV; | |
204 | buf->dev.dev = pcm->card->dev; | |
205 | buf->private_data = NULL; | |
206 | buf->area = dma_alloc_coherent(pcm->card->dev, size, | |
207 | &buf->addr, GFP_KERNEL); | |
208 | if (!buf->area) { | |
2f1ff661 | 209 | pr_err("Failed to allocate dma memory - Please increase uncached DMA memory region\n"); |
88740da1 CC |
210 | return -ENOMEM; |
211 | } | |
212 | buf->bytes = size; | |
213 | ||
214 | pr_debug("%s, area:%p, size:0x%08lx\n", __func__, | |
215 | buf->area, buf->bytes); | |
216 | ||
217 | if (stream == SNDRV_PCM_STREAM_PLAYBACK) | |
218 | sport_handle->tx_buf = buf->area; | |
219 | else | |
220 | sport_handle->rx_buf = buf->area; | |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
225 | static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm) | |
226 | { | |
227 | struct snd_pcm_substream *substream; | |
228 | struct snd_dma_buffer *buf; | |
229 | int stream; | |
230 | ||
231 | for (stream = 0; stream < 2; stream++) { | |
232 | substream = pcm->streams[stream].substream; | |
233 | if (!substream) | |
234 | continue; | |
235 | ||
236 | buf = &substream->dma_buffer; | |
237 | if (!buf->area) | |
238 | continue; | |
239 | dma_free_coherent(NULL, buf->bytes, buf->area, 0); | |
240 | buf->area = NULL; | |
241 | } | |
242 | if (sport_handle) | |
243 | sport_done(sport_handle); | |
244 | } | |
245 | ||
284901a9 | 246 | static u64 bf5xx_pcm_dmamask = DMA_BIT_MASK(32); |
88740da1 CC |
247 | |
248 | int bf5xx_pcm_i2s_new(struct snd_card *card, struct snd_soc_dai *dai, | |
249 | struct snd_pcm *pcm) | |
250 | { | |
251 | int ret = 0; | |
252 | ||
253 | pr_debug("%s enter\n", __func__); | |
254 | if (!card->dev->dma_mask) | |
255 | card->dev->dma_mask = &bf5xx_pcm_dmamask; | |
256 | if (!card->dev->coherent_dma_mask) | |
284901a9 | 257 | card->dev->coherent_dma_mask = DMA_BIT_MASK(32); |
88740da1 | 258 | |
f0fba2ad | 259 | if (dai->driver->playback.channels_min) { |
88740da1 CC |
260 | ret = bf5xx_pcm_preallocate_dma_buffer(pcm, |
261 | SNDRV_PCM_STREAM_PLAYBACK); | |
262 | if (ret) | |
263 | goto out; | |
264 | } | |
265 | ||
f0fba2ad | 266 | if (dai->driver->capture.channels_min) { |
88740da1 CC |
267 | ret = bf5xx_pcm_preallocate_dma_buffer(pcm, |
268 | SNDRV_PCM_STREAM_CAPTURE); | |
269 | if (ret) | |
270 | goto out; | |
271 | } | |
272 | out: | |
273 | return ret; | |
274 | } | |
275 | ||
f0fba2ad LG |
276 | static struct snd_soc_platform_driver bf5xx_i2s_soc_platform = { |
277 | .ops = &bf5xx_pcm_i2s_ops, | |
88740da1 CC |
278 | .pcm_new = bf5xx_pcm_i2s_new, |
279 | .pcm_free = bf5xx_pcm_free_dma_buffers, | |
280 | }; | |
88740da1 | 281 | |
f0fba2ad | 282 | static int __devinit bfin_i2s_soc_platform_probe(struct platform_device *pdev) |
958e792c | 283 | { |
f0fba2ad | 284 | return snd_soc_register_platform(&pdev->dev, &bf5xx_i2s_soc_platform); |
958e792c | 285 | } |
958e792c | 286 | |
f0fba2ad | 287 | static int __devexit bfin_i2s_soc_platform_remove(struct platform_device *pdev) |
958e792c | 288 | { |
f0fba2ad LG |
289 | snd_soc_unregister_platform(&pdev->dev); |
290 | return 0; | |
291 | } | |
292 | ||
293 | static struct platform_driver bfin_i2s_pcm_driver = { | |
294 | .driver = { | |
295 | .name = "bfin-pcm-audio", | |
296 | .owner = THIS_MODULE, | |
297 | }, | |
298 | ||
299 | .probe = bfin_i2s_soc_platform_probe, | |
300 | .remove = __devexit_p(bfin_i2s_soc_platform_remove), | |
301 | }; | |
302 | ||
303 | static int __init snd_bfin_i2s_pcm_init(void) | |
304 | { | |
305 | return platform_driver_register(&bfin_i2s_pcm_driver); | |
306 | } | |
307 | module_init(snd_bfin_i2s_pcm_init); | |
308 | ||
309 | static void __exit snd_bfin_i2s_pcm_exit(void) | |
310 | { | |
311 | platform_driver_unregister(&bfin_i2s_pcm_driver); | |
958e792c | 312 | } |
f0fba2ad | 313 | module_exit(snd_bfin_i2s_pcm_exit); |
958e792c | 314 | |
88740da1 CC |
315 | MODULE_AUTHOR("Cliff Cai"); |
316 | MODULE_DESCRIPTION("ADI Blackfin I2S PCM DMA module"); | |
317 | MODULE_LICENSE("GPL"); |