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1 | /* |
2 | * atmel-pcm.c -- ALSA PCM interface for the Atmel atmel SoC. | |
3 | * | |
4 | * Copyright (C) 2005 SAN People | |
5 | * Copyright (C) 2008 Atmel | |
6 | * | |
7 | * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com> | |
8 | * | |
9 | * Based on at91-pcm. by: | |
10 | * Frank Mandarino <fmandarino@endrelia.com> | |
11 | * Copyright 2006 Endrelia Technologies Inc. | |
12 | * | |
13 | * Based on pxa2xx-pcm.c by: | |
14 | * | |
15 | * Author: Nicolas Pitre | |
16 | * Created: Nov 30, 2004 | |
17 | * Copyright: (C) 2004 MontaVista Software, Inc. | |
18 | * | |
19 | * This program is free software; you can redistribute it and/or modify | |
20 | * it under the terms of the GNU General Public License as published by | |
21 | * the Free Software Foundation; either version 2 of the License, or | |
22 | * (at your option) any later version. | |
23 | * | |
24 | * This program is distributed in the hope that it will be useful, | |
25 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
26 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
27 | * GNU General Public License for more details. | |
28 | * | |
29 | * You should have received a copy of the GNU General Public License | |
30 | * along with this program; if not, write to the Free Software | |
31 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
32 | */ | |
33 | ||
34 | #include <linux/module.h> | |
35 | #include <linux/init.h> | |
36 | #include <linux/platform_device.h> | |
37 | #include <linux/slab.h> | |
38 | #include <linux/dma-mapping.h> | |
39 | #include <linux/atmel_pdc.h> | |
40 | #include <linux/atmel-ssc.h> | |
41 | ||
42 | #include <sound/core.h> | |
43 | #include <sound/pcm.h> | |
44 | #include <sound/pcm_params.h> | |
45 | #include <sound/soc.h> | |
46 | ||
47 | #include "atmel-pcm.h" | |
48 | ||
49 | ||
50 | /*--------------------------------------------------------------------------*\ | |
51 | * Hardware definition | |
52 | \*--------------------------------------------------------------------------*/ | |
53 | /* TODO: These values were taken from the AT91 platform driver, check | |
54 | * them against real values for AT32 | |
55 | */ | |
56 | static const struct snd_pcm_hardware atmel_pcm_hardware = { | |
57 | .info = SNDRV_PCM_INFO_MMAP | | |
58 | SNDRV_PCM_INFO_MMAP_VALID | | |
59 | SNDRV_PCM_INFO_INTERLEAVED | | |
60 | SNDRV_PCM_INFO_PAUSE, | |
92dfa619 BS |
61 | .period_bytes_min = 32, |
62 | .period_bytes_max = 8192, | |
63 | .periods_min = 2, | |
64 | .periods_max = 1024, | |
65 | .buffer_bytes_max = ATMEL_SSC_DMABUF_SIZE, | |
66 | }; | |
67 | ||
68 | ||
69 | /*--------------------------------------------------------------------------*\ | |
70 | * Data types | |
71 | \*--------------------------------------------------------------------------*/ | |
72 | struct atmel_runtime_data { | |
73 | struct atmel_pcm_dma_params *params; | |
74 | dma_addr_t dma_buffer; /* physical address of dma buffer */ | |
75 | dma_addr_t dma_buffer_end; /* first address beyond DMA buffer */ | |
76 | size_t period_size; | |
77 | ||
78 | dma_addr_t period_ptr; /* physical address of next period */ | |
92dfa619 BS |
79 | }; |
80 | ||
81 | /*--------------------------------------------------------------------------*\ | |
82 | * ISR | |
83 | \*--------------------------------------------------------------------------*/ | |
84 | static void atmel_pcm_dma_irq(u32 ssc_sr, | |
85 | struct snd_pcm_substream *substream) | |
86 | { | |
87 | struct atmel_runtime_data *prtd = substream->runtime->private_data; | |
88 | struct atmel_pcm_dma_params *params = prtd->params; | |
89 | static int count; | |
90 | ||
91 | count++; | |
92 | ||
93 | if (ssc_sr & params->mask->ssc_endbuf) { | |
94 | pr_warn("atmel-pcm: buffer %s on %s (SSC_SR=%#x, count=%d)\n", | |
95 | substream->stream == SNDRV_PCM_STREAM_PLAYBACK | |
96 | ? "underrun" : "overrun", | |
97 | params->name, ssc_sr, count); | |
98 | ||
99 | /* re-start the PDC */ | |
100 | ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR, | |
101 | params->mask->pdc_disable); | |
102 | prtd->period_ptr += prtd->period_size; | |
103 | if (prtd->period_ptr >= prtd->dma_buffer_end) | |
104 | prtd->period_ptr = prtd->dma_buffer; | |
105 | ||
106 | ssc_writex(params->ssc->regs, params->pdc->xpr, | |
107 | prtd->period_ptr); | |
108 | ssc_writex(params->ssc->regs, params->pdc->xcr, | |
109 | prtd->period_size / params->pdc_xfer_size); | |
110 | ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR, | |
111 | params->mask->pdc_enable); | |
112 | } | |
113 | ||
114 | if (ssc_sr & params->mask->ssc_endx) { | |
115 | /* Load the PDC next pointer and counter registers */ | |
116 | prtd->period_ptr += prtd->period_size; | |
117 | if (prtd->period_ptr >= prtd->dma_buffer_end) | |
118 | prtd->period_ptr = prtd->dma_buffer; | |
119 | ||
120 | ssc_writex(params->ssc->regs, params->pdc->xnpr, | |
121 | prtd->period_ptr); | |
122 | ssc_writex(params->ssc->regs, params->pdc->xncr, | |
123 | prtd->period_size / params->pdc_xfer_size); | |
124 | } | |
125 | ||
126 | snd_pcm_period_elapsed(substream); | |
127 | } | |
128 | ||
129 | ||
130 | /*--------------------------------------------------------------------------*\ | |
131 | * PCM operations | |
132 | \*--------------------------------------------------------------------------*/ | |
133 | static int atmel_pcm_hw_params(struct snd_pcm_substream *substream, | |
134 | struct snd_pcm_hw_params *params) | |
135 | { | |
136 | struct snd_pcm_runtime *runtime = substream->runtime; | |
137 | struct atmel_runtime_data *prtd = runtime->private_data; | |
138 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
139 | ||
140 | /* this may get called several times by oss emulation | |
141 | * with different params */ | |
142 | ||
143 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); | |
144 | runtime->dma_bytes = params_buffer_bytes(params); | |
145 | ||
146 | prtd->params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); | |
147 | prtd->params->dma_intr_handler = atmel_pcm_dma_irq; | |
148 | ||
149 | prtd->dma_buffer = runtime->dma_addr; | |
150 | prtd->dma_buffer_end = runtime->dma_addr + runtime->dma_bytes; | |
151 | prtd->period_size = params_period_bytes(params); | |
152 | ||
153 | pr_debug("atmel-pcm: " | |
154 | "hw_params: DMA for %s initialized " | |
153f5a18 | 155 | "(dma_bytes=%zu, period_size=%zu)\n", |
92dfa619 BS |
156 | prtd->params->name, |
157 | runtime->dma_bytes, | |
158 | prtd->period_size); | |
159 | return 0; | |
160 | } | |
161 | ||
162 | static int atmel_pcm_hw_free(struct snd_pcm_substream *substream) | |
163 | { | |
164 | struct atmel_runtime_data *prtd = substream->runtime->private_data; | |
165 | struct atmel_pcm_dma_params *params = prtd->params; | |
166 | ||
167 | if (params != NULL) { | |
168 | ssc_writex(params->ssc->regs, SSC_PDC_PTCR, | |
169 | params->mask->pdc_disable); | |
170 | prtd->params->dma_intr_handler = NULL; | |
171 | } | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
176 | static int atmel_pcm_prepare(struct snd_pcm_substream *substream) | |
177 | { | |
178 | struct atmel_runtime_data *prtd = substream->runtime->private_data; | |
179 | struct atmel_pcm_dma_params *params = prtd->params; | |
180 | ||
181 | ssc_writex(params->ssc->regs, SSC_IDR, | |
182 | params->mask->ssc_endx | params->mask->ssc_endbuf); | |
183 | ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR, | |
184 | params->mask->pdc_disable); | |
185 | return 0; | |
186 | } | |
187 | ||
188 | static int atmel_pcm_trigger(struct snd_pcm_substream *substream, | |
189 | int cmd) | |
190 | { | |
191 | struct snd_pcm_runtime *rtd = substream->runtime; | |
192 | struct atmel_runtime_data *prtd = rtd->private_data; | |
193 | struct atmel_pcm_dma_params *params = prtd->params; | |
194 | int ret = 0; | |
195 | ||
196 | pr_debug("atmel-pcm:buffer_size = %ld," | |
153f5a18 | 197 | "dma_area = %p, dma_bytes = %zu\n", |
92dfa619 BS |
198 | rtd->buffer_size, rtd->dma_area, rtd->dma_bytes); |
199 | ||
200 | switch (cmd) { | |
201 | case SNDRV_PCM_TRIGGER_START: | |
202 | prtd->period_ptr = prtd->dma_buffer; | |
203 | ||
204 | ssc_writex(params->ssc->regs, params->pdc->xpr, | |
205 | prtd->period_ptr); | |
206 | ssc_writex(params->ssc->regs, params->pdc->xcr, | |
207 | prtd->period_size / params->pdc_xfer_size); | |
208 | ||
209 | prtd->period_ptr += prtd->period_size; | |
210 | ssc_writex(params->ssc->regs, params->pdc->xnpr, | |
211 | prtd->period_ptr); | |
212 | ssc_writex(params->ssc->regs, params->pdc->xncr, | |
213 | prtd->period_size / params->pdc_xfer_size); | |
214 | ||
215 | pr_debug("atmel-pcm: trigger: " | |
216 | "period_ptr=%lx, xpr=%u, " | |
217 | "xcr=%u, xnpr=%u, xncr=%u\n", | |
218 | (unsigned long)prtd->period_ptr, | |
219 | ssc_readx(params->ssc->regs, params->pdc->xpr), | |
220 | ssc_readx(params->ssc->regs, params->pdc->xcr), | |
221 | ssc_readx(params->ssc->regs, params->pdc->xnpr), | |
222 | ssc_readx(params->ssc->regs, params->pdc->xncr)); | |
223 | ||
224 | ssc_writex(params->ssc->regs, SSC_IER, | |
225 | params->mask->ssc_endx | params->mask->ssc_endbuf); | |
226 | ssc_writex(params->ssc->regs, SSC_PDC_PTCR, | |
227 | params->mask->pdc_enable); | |
228 | ||
229 | pr_debug("sr=%u imr=%u\n", | |
230 | ssc_readx(params->ssc->regs, SSC_SR), | |
231 | ssc_readx(params->ssc->regs, SSC_IER)); | |
232 | break; /* SNDRV_PCM_TRIGGER_START */ | |
233 | ||
234 | case SNDRV_PCM_TRIGGER_STOP: | |
235 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
236 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
237 | ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR, | |
238 | params->mask->pdc_disable); | |
239 | break; | |
240 | ||
241 | case SNDRV_PCM_TRIGGER_RESUME: | |
242 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
243 | ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR, | |
244 | params->mask->pdc_enable); | |
245 | break; | |
246 | ||
247 | default: | |
248 | ret = -EINVAL; | |
249 | } | |
250 | ||
251 | return ret; | |
252 | } | |
253 | ||
254 | static snd_pcm_uframes_t atmel_pcm_pointer( | |
255 | struct snd_pcm_substream *substream) | |
256 | { | |
257 | struct snd_pcm_runtime *runtime = substream->runtime; | |
258 | struct atmel_runtime_data *prtd = runtime->private_data; | |
259 | struct atmel_pcm_dma_params *params = prtd->params; | |
260 | dma_addr_t ptr; | |
261 | snd_pcm_uframes_t x; | |
262 | ||
263 | ptr = (dma_addr_t) ssc_readx(params->ssc->regs, params->pdc->xpr); | |
264 | x = bytes_to_frames(runtime, ptr - prtd->dma_buffer); | |
265 | ||
266 | if (x == runtime->buffer_size) | |
267 | x = 0; | |
268 | ||
269 | return x; | |
270 | } | |
271 | ||
272 | static int atmel_pcm_open(struct snd_pcm_substream *substream) | |
273 | { | |
274 | struct snd_pcm_runtime *runtime = substream->runtime; | |
275 | struct atmel_runtime_data *prtd; | |
276 | int ret = 0; | |
277 | ||
278 | snd_soc_set_runtime_hwparams(substream, &atmel_pcm_hardware); | |
279 | ||
280 | /* ensure that buffer size is a multiple of period size */ | |
281 | ret = snd_pcm_hw_constraint_integer(runtime, | |
282 | SNDRV_PCM_HW_PARAM_PERIODS); | |
283 | if (ret < 0) | |
284 | goto out; | |
285 | ||
286 | prtd = kzalloc(sizeof(struct atmel_runtime_data), GFP_KERNEL); | |
287 | if (prtd == NULL) { | |
288 | ret = -ENOMEM; | |
289 | goto out; | |
290 | } | |
291 | runtime->private_data = prtd; | |
292 | ||
293 | out: | |
294 | return ret; | |
295 | } | |
296 | ||
297 | static int atmel_pcm_close(struct snd_pcm_substream *substream) | |
298 | { | |
299 | struct atmel_runtime_data *prtd = substream->runtime->private_data; | |
300 | ||
301 | kfree(prtd); | |
302 | return 0; | |
303 | } | |
304 | ||
305 | static struct snd_pcm_ops atmel_pcm_ops = { | |
306 | .open = atmel_pcm_open, | |
307 | .close = atmel_pcm_close, | |
308 | .ioctl = snd_pcm_lib_ioctl, | |
309 | .hw_params = atmel_pcm_hw_params, | |
310 | .hw_free = atmel_pcm_hw_free, | |
311 | .prepare = atmel_pcm_prepare, | |
312 | .trigger = atmel_pcm_trigger, | |
313 | .pointer = atmel_pcm_pointer, | |
314 | .mmap = atmel_pcm_mmap, | |
315 | }; | |
316 | ||
92dfa619 BS |
317 | static struct snd_soc_platform_driver atmel_soc_platform = { |
318 | .ops = &atmel_pcm_ops, | |
319 | .pcm_new = atmel_pcm_new, | |
320 | .pcm_free = atmel_pcm_free, | |
92dfa619 BS |
321 | }; |
322 | ||
323 | int atmel_pcm_pdc_platform_register(struct device *dev) | |
324 | { | |
325 | return snd_soc_register_platform(dev, &atmel_soc_platform); | |
326 | } | |
327 | EXPORT_SYMBOL(atmel_pcm_pdc_platform_register); | |
328 | ||
329 | void atmel_pcm_pdc_platform_unregister(struct device *dev) | |
330 | { | |
331 | snd_soc_unregister_platform(dev); | |
332 | } | |
333 | EXPORT_SYMBOL(atmel_pcm_pdc_platform_unregister); | |
334 | ||
335 | MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>"); | |
336 | MODULE_DESCRIPTION("Atmel PCM module"); | |
337 | MODULE_LICENSE("GPL"); |