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1 | /* | |
2 | * ALSA PCM interface for the TI DAVINCI processor | |
3 | * | |
4 | * Author: Vladimir Barinov, <vbarinov@embeddedalley.com> | |
5 | * Copyright: (C) 2007 MontaVista Software, Inc., <source@mvista.com> | |
6 | * added SRAM ping/pong (C) 2008 Troy Kisky <troy.kisky@boundarydevices.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/dma-mapping.h> | |
18 | #include <linux/kernel.h> | |
19 | ||
20 | #include <sound/core.h> | |
21 | #include <sound/pcm.h> | |
22 | #include <sound/pcm_params.h> | |
23 | #include <sound/soc.h> | |
24 | ||
25 | #include <asm/dma.h> | |
26 | #include <mach/edma.h> | |
27 | #include <mach/sram.h> | |
28 | ||
29 | #include "davinci-pcm.h" | |
30 | ||
31 | #ifdef DEBUG | |
32 | static void print_buf_info(int slot, char *name) | |
33 | { | |
34 | struct edmacc_param p; | |
35 | if (slot < 0) | |
36 | return; | |
37 | edma_read_slot(slot, &p); | |
38 | printk(KERN_DEBUG "%s: 0x%x, opt=%x, src=%x, a_b_cnt=%x dst=%x\n", | |
39 | name, slot, p.opt, p.src, p.a_b_cnt, p.dst); | |
40 | printk(KERN_DEBUG " src_dst_bidx=%x link_bcntrld=%x src_dst_cidx=%x ccnt=%x\n", | |
41 | p.src_dst_bidx, p.link_bcntrld, p.src_dst_cidx, p.ccnt); | |
42 | } | |
43 | #else | |
44 | static void print_buf_info(int slot, char *name) | |
45 | { | |
46 | } | |
47 | #endif | |
48 | ||
49 | static struct snd_pcm_hardware pcm_hardware_playback = { | |
50 | .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | | |
51 | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | | |
52 | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME), | |
53 | .formats = (SNDRV_PCM_FMTBIT_S16_LE), | |
54 | .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 | | |
55 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | | |
56 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | | |
57 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 | | |
58 | SNDRV_PCM_RATE_KNOT), | |
59 | .rate_min = 8000, | |
60 | .rate_max = 96000, | |
61 | .channels_min = 2, | |
62 | .channels_max = 2, | |
63 | .buffer_bytes_max = 128 * 1024, | |
64 | .period_bytes_min = 32, | |
65 | .period_bytes_max = 8 * 1024, | |
66 | .periods_min = 16, | |
67 | .periods_max = 255, | |
68 | .fifo_size = 0, | |
69 | }; | |
70 | ||
71 | static struct snd_pcm_hardware pcm_hardware_capture = { | |
72 | .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | | |
73 | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | | |
74 | SNDRV_PCM_INFO_PAUSE), | |
75 | .formats = (SNDRV_PCM_FMTBIT_S16_LE), | |
76 | .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 | | |
77 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | | |
78 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | | |
79 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 | | |
80 | SNDRV_PCM_RATE_KNOT), | |
81 | .rate_min = 8000, | |
82 | .rate_max = 96000, | |
83 | .channels_min = 2, | |
84 | .channels_max = 2, | |
85 | .buffer_bytes_max = 128 * 1024, | |
86 | .period_bytes_min = 32, | |
87 | .period_bytes_max = 8 * 1024, | |
88 | .periods_min = 16, | |
89 | .periods_max = 255, | |
90 | .fifo_size = 0, | |
91 | }; | |
92 | ||
93 | /* | |
94 | * How ping/pong works.... | |
95 | * | |
96 | * Playback: | |
97 | * ram_params - copys 2*ping_size from start of SDRAM to iram, | |
98 | * links to ram_link2 | |
99 | * ram_link2 - copys rest of SDRAM to iram in ping_size units, | |
100 | * links to ram_link | |
101 | * ram_link - copys entire SDRAM to iram in ping_size uints, | |
102 | * links to self | |
103 | * | |
104 | * asp_params - same as asp_link[0] | |
105 | * asp_link[0] - copys from lower half of iram to asp port | |
106 | * links to asp_link[1], triggers iram copy event on completion | |
107 | * asp_link[1] - copys from upper half of iram to asp port | |
108 | * links to asp_link[0], triggers iram copy event on completion | |
109 | * triggers interrupt only needed to let upper SOC levels update position | |
110 | * in stream on completion | |
111 | * | |
112 | * When playback is started: | |
113 | * ram_params started | |
114 | * asp_params started | |
115 | * | |
116 | * Capture: | |
117 | * ram_params - same as ram_link, | |
118 | * links to ram_link | |
119 | * ram_link - same as playback | |
120 | * links to self | |
121 | * | |
122 | * asp_params - same as playback | |
123 | * asp_link[0] - same as playback | |
124 | * asp_link[1] - same as playback | |
125 | * | |
126 | * When capture is started: | |
127 | * asp_params started | |
128 | */ | |
129 | struct davinci_runtime_data { | |
130 | spinlock_t lock; | |
131 | int period; /* current DMA period */ | |
132 | int asp_channel; /* Master DMA channel */ | |
133 | int asp_link[2]; /* asp parameter link channel, ping/pong */ | |
134 | struct davinci_pcm_dma_params *params; /* DMA params */ | |
135 | int ram_channel; | |
136 | int ram_link; | |
137 | int ram_link2; | |
138 | struct edmacc_param asp_params; | |
139 | struct edmacc_param ram_params; | |
140 | }; | |
141 | ||
142 | /* | |
143 | * Not used with ping/pong | |
144 | */ | |
145 | static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream) | |
146 | { | |
147 | struct davinci_runtime_data *prtd = substream->runtime->private_data; | |
148 | struct snd_pcm_runtime *runtime = substream->runtime; | |
149 | int link = prtd->asp_link[0]; | |
150 | unsigned int period_size; | |
151 | unsigned int dma_offset; | |
152 | dma_addr_t dma_pos; | |
153 | dma_addr_t src, dst; | |
154 | unsigned short src_bidx, dst_bidx; | |
155 | unsigned short src_cidx, dst_cidx; | |
156 | unsigned int data_type; | |
157 | unsigned short acnt; | |
158 | unsigned int count; | |
159 | unsigned int fifo_level; | |
160 | ||
161 | period_size = snd_pcm_lib_period_bytes(substream); | |
162 | dma_offset = prtd->period * period_size; | |
163 | dma_pos = runtime->dma_addr + dma_offset; | |
164 | fifo_level = prtd->params->fifo_level; | |
165 | ||
166 | pr_debug("davinci_pcm: audio_set_dma_params_play channel = %d " | |
167 | "dma_ptr = %x period_size=%x\n", link, dma_pos, period_size); | |
168 | ||
169 | data_type = prtd->params->data_type; | |
170 | count = period_size / data_type; | |
171 | if (fifo_level) | |
172 | count /= fifo_level; | |
173 | ||
174 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
175 | src = dma_pos; | |
176 | dst = prtd->params->dma_addr; | |
177 | src_bidx = data_type; | |
178 | dst_bidx = 0; | |
179 | src_cidx = data_type * fifo_level; | |
180 | dst_cidx = 0; | |
181 | } else { | |
182 | src = prtd->params->dma_addr; | |
183 | dst = dma_pos; | |
184 | src_bidx = 0; | |
185 | dst_bidx = data_type; | |
186 | src_cidx = 0; | |
187 | dst_cidx = data_type * fifo_level; | |
188 | } | |
189 | ||
190 | acnt = prtd->params->acnt; | |
191 | edma_set_src(link, src, INCR, W8BIT); | |
192 | edma_set_dest(link, dst, INCR, W8BIT); | |
193 | ||
194 | edma_set_src_index(link, src_bidx, src_cidx); | |
195 | edma_set_dest_index(link, dst_bidx, dst_cidx); | |
196 | ||
197 | if (!fifo_level) | |
198 | edma_set_transfer_params(link, acnt, count, 1, 0, ASYNC); | |
199 | else | |
200 | edma_set_transfer_params(link, acnt, fifo_level, count, | |
201 | fifo_level, ABSYNC); | |
202 | ||
203 | prtd->period++; | |
204 | if (unlikely(prtd->period >= runtime->periods)) | |
205 | prtd->period = 0; | |
206 | } | |
207 | ||
208 | static void davinci_pcm_dma_irq(unsigned link, u16 ch_status, void *data) | |
209 | { | |
210 | struct snd_pcm_substream *substream = data; | |
211 | struct davinci_runtime_data *prtd = substream->runtime->private_data; | |
212 | ||
213 | print_buf_info(prtd->ram_channel, "i ram_channel"); | |
214 | pr_debug("davinci_pcm: link=%d, status=0x%x\n", link, ch_status); | |
215 | ||
216 | if (unlikely(ch_status != DMA_COMPLETE)) | |
217 | return; | |
218 | ||
219 | if (snd_pcm_running(substream)) { | |
220 | if (prtd->ram_channel < 0) { | |
221 | /* No ping/pong must fix up link dma data*/ | |
222 | spin_lock(&prtd->lock); | |
223 | davinci_pcm_enqueue_dma(substream); | |
224 | spin_unlock(&prtd->lock); | |
225 | } | |
226 | snd_pcm_period_elapsed(substream); | |
227 | } | |
228 | } | |
229 | ||
230 | static int allocate_sram(struct snd_pcm_substream *substream, unsigned size, | |
231 | struct snd_pcm_hardware *ppcm) | |
232 | { | |
233 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
234 | struct snd_dma_buffer *iram_dma = NULL; | |
235 | dma_addr_t iram_phys = 0; | |
236 | void *iram_virt = NULL; | |
237 | ||
238 | if (buf->private_data || !size) | |
239 | return 0; | |
240 | ||
241 | ppcm->period_bytes_max = size; | |
242 | iram_virt = sram_alloc(size, &iram_phys); | |
243 | if (!iram_virt) | |
244 | goto exit1; | |
245 | iram_dma = kzalloc(sizeof(*iram_dma), GFP_KERNEL); | |
246 | if (!iram_dma) | |
247 | goto exit2; | |
248 | iram_dma->area = iram_virt; | |
249 | iram_dma->addr = iram_phys; | |
250 | memset(iram_dma->area, 0, size); | |
251 | iram_dma->bytes = size; | |
252 | buf->private_data = iram_dma; | |
253 | return 0; | |
254 | exit2: | |
255 | if (iram_virt) | |
256 | sram_free(iram_virt, size); | |
257 | exit1: | |
258 | return -ENOMEM; | |
259 | } | |
260 | ||
261 | /* | |
262 | * Only used with ping/pong. | |
263 | * This is called after runtime->dma_addr, period_bytes and data_type are valid | |
264 | */ | |
265 | static int ping_pong_dma_setup(struct snd_pcm_substream *substream) | |
266 | { | |
267 | unsigned short ram_src_cidx, ram_dst_cidx; | |
268 | struct snd_pcm_runtime *runtime = substream->runtime; | |
269 | struct davinci_runtime_data *prtd = runtime->private_data; | |
270 | struct snd_dma_buffer *iram_dma = | |
271 | (struct snd_dma_buffer *)substream->dma_buffer.private_data; | |
272 | struct davinci_pcm_dma_params *params = prtd->params; | |
273 | unsigned int data_type = params->data_type; | |
274 | unsigned int acnt = params->acnt; | |
275 | /* divide by 2 for ping/pong */ | |
276 | unsigned int ping_size = snd_pcm_lib_period_bytes(substream) >> 1; | |
277 | int link = prtd->asp_link[1]; | |
278 | unsigned int fifo_level = prtd->params->fifo_level; | |
279 | unsigned int count; | |
280 | if ((data_type == 0) || (data_type > 4)) { | |
281 | printk(KERN_ERR "%s: data_type=%i\n", __func__, data_type); | |
282 | return -EINVAL; | |
283 | } | |
284 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
285 | dma_addr_t asp_src_pong = iram_dma->addr + ping_size; | |
286 | ram_src_cidx = ping_size; | |
287 | ram_dst_cidx = -ping_size; | |
288 | edma_set_src(link, asp_src_pong, INCR, W8BIT); | |
289 | ||
290 | link = prtd->asp_link[0]; | |
291 | edma_set_src_index(link, data_type, data_type * fifo_level); | |
292 | link = prtd->asp_link[1]; | |
293 | edma_set_src_index(link, data_type, data_type * fifo_level); | |
294 | ||
295 | link = prtd->ram_link; | |
296 | edma_set_src(link, runtime->dma_addr, INCR, W32BIT); | |
297 | } else { | |
298 | dma_addr_t asp_dst_pong = iram_dma->addr + ping_size; | |
299 | ram_src_cidx = -ping_size; | |
300 | ram_dst_cidx = ping_size; | |
301 | edma_set_dest(link, asp_dst_pong, INCR, W8BIT); | |
302 | ||
303 | link = prtd->asp_link[0]; | |
304 | edma_set_dest_index(link, data_type, data_type * fifo_level); | |
305 | link = prtd->asp_link[1]; | |
306 | edma_set_dest_index(link, data_type, data_type * fifo_level); | |
307 | ||
308 | link = prtd->ram_link; | |
309 | edma_set_dest(link, runtime->dma_addr, INCR, W32BIT); | |
310 | } | |
311 | ||
312 | if (!fifo_level) { | |
313 | count = ping_size / data_type; | |
314 | edma_set_transfer_params(prtd->asp_link[0], acnt, count, | |
315 | 1, 0, ASYNC); | |
316 | edma_set_transfer_params(prtd->asp_link[1], acnt, count, | |
317 | 1, 0, ASYNC); | |
318 | } else { | |
319 | count = ping_size / (data_type * fifo_level); | |
320 | edma_set_transfer_params(prtd->asp_link[0], acnt, fifo_level, | |
321 | count, fifo_level, ABSYNC); | |
322 | edma_set_transfer_params(prtd->asp_link[1], acnt, fifo_level, | |
323 | count, fifo_level, ABSYNC); | |
324 | } | |
325 | ||
326 | link = prtd->ram_link; | |
327 | edma_set_src_index(link, ping_size, ram_src_cidx); | |
328 | edma_set_dest_index(link, ping_size, ram_dst_cidx); | |
329 | edma_set_transfer_params(link, ping_size, 2, | |
330 | runtime->periods, 2, ASYNC); | |
331 | ||
332 | /* init master params */ | |
333 | edma_read_slot(prtd->asp_link[0], &prtd->asp_params); | |
334 | edma_read_slot(prtd->ram_link, &prtd->ram_params); | |
335 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
336 | struct edmacc_param p_ram; | |
337 | /* Copy entire iram buffer before playback started */ | |
338 | prtd->ram_params.a_b_cnt = (1 << 16) | (ping_size << 1); | |
339 | /* 0 dst_bidx */ | |
340 | prtd->ram_params.src_dst_bidx = (ping_size << 1); | |
341 | /* 0 dst_cidx */ | |
342 | prtd->ram_params.src_dst_cidx = (ping_size << 1); | |
343 | prtd->ram_params.ccnt = 1; | |
344 | ||
345 | /* Skip 1st period */ | |
346 | edma_read_slot(prtd->ram_link, &p_ram); | |
347 | p_ram.src += (ping_size << 1); | |
348 | p_ram.ccnt -= 1; | |
349 | edma_write_slot(prtd->ram_link2, &p_ram); | |
350 | /* | |
351 | * When 1st started, ram -> iram dma channel will fill the | |
352 | * entire iram. Then, whenever a ping/pong asp buffer finishes, | |
353 | * 1/2 iram will be filled. | |
354 | */ | |
355 | prtd->ram_params.link_bcntrld = | |
356 | EDMA_CHAN_SLOT(prtd->ram_link2) << 5; | |
357 | } | |
358 | return 0; | |
359 | } | |
360 | ||
361 | /* 1 asp tx or rx channel using 2 parameter channels | |
362 | * 1 ram to/from iram channel using 1 parameter channel | |
363 | * | |
364 | * Playback | |
365 | * ram copy channel kicks off first, | |
366 | * 1st ram copy of entire iram buffer completion kicks off asp channel | |
367 | * asp tcc always kicks off ram copy of 1/2 iram buffer | |
368 | * | |
369 | * Record | |
370 | * asp channel starts, tcc kicks off ram copy | |
371 | */ | |
372 | static int request_ping_pong(struct snd_pcm_substream *substream, | |
373 | struct davinci_runtime_data *prtd, | |
374 | struct snd_dma_buffer *iram_dma) | |
375 | { | |
376 | dma_addr_t asp_src_ping; | |
377 | dma_addr_t asp_dst_ping; | |
378 | int link; | |
379 | struct davinci_pcm_dma_params *params = prtd->params; | |
380 | ||
381 | /* Request ram master channel */ | |
382 | link = prtd->ram_channel = edma_alloc_channel(EDMA_CHANNEL_ANY, | |
383 | davinci_pcm_dma_irq, substream, | |
384 | prtd->params->ram_chan_q); | |
385 | if (link < 0) | |
386 | goto exit1; | |
387 | ||
388 | /* Request ram link channel */ | |
389 | link = prtd->ram_link = edma_alloc_slot( | |
390 | EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY); | |
391 | if (link < 0) | |
392 | goto exit2; | |
393 | ||
394 | link = prtd->asp_link[1] = edma_alloc_slot( | |
395 | EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY); | |
396 | if (link < 0) | |
397 | goto exit3; | |
398 | ||
399 | prtd->ram_link2 = -1; | |
400 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
401 | link = prtd->ram_link2 = edma_alloc_slot( | |
402 | EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY); | |
403 | if (link < 0) | |
404 | goto exit4; | |
405 | } | |
406 | /* circle ping-pong buffers */ | |
407 | edma_link(prtd->asp_link[0], prtd->asp_link[1]); | |
408 | edma_link(prtd->asp_link[1], prtd->asp_link[0]); | |
409 | /* circle ram buffers */ | |
410 | edma_link(prtd->ram_link, prtd->ram_link); | |
411 | ||
412 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
413 | asp_src_ping = iram_dma->addr; | |
414 | asp_dst_ping = params->dma_addr; /* fifo */ | |
415 | } else { | |
416 | asp_src_ping = params->dma_addr; /* fifo */ | |
417 | asp_dst_ping = iram_dma->addr; | |
418 | } | |
419 | /* ping */ | |
420 | link = prtd->asp_link[0]; | |
421 | edma_set_src(link, asp_src_ping, INCR, W16BIT); | |
422 | edma_set_dest(link, asp_dst_ping, INCR, W16BIT); | |
423 | edma_set_src_index(link, 0, 0); | |
424 | edma_set_dest_index(link, 0, 0); | |
425 | ||
426 | edma_read_slot(link, &prtd->asp_params); | |
427 | prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f) | TCINTEN); | |
428 | prtd->asp_params.opt |= TCCHEN | EDMA_TCC(prtd->ram_channel & 0x3f); | |
429 | edma_write_slot(link, &prtd->asp_params); | |
430 | ||
431 | /* pong */ | |
432 | link = prtd->asp_link[1]; | |
433 | edma_set_src(link, asp_src_ping, INCR, W16BIT); | |
434 | edma_set_dest(link, asp_dst_ping, INCR, W16BIT); | |
435 | edma_set_src_index(link, 0, 0); | |
436 | edma_set_dest_index(link, 0, 0); | |
437 | ||
438 | edma_read_slot(link, &prtd->asp_params); | |
439 | prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f)); | |
440 | /* interrupt after every pong completion */ | |
441 | prtd->asp_params.opt |= TCINTEN | TCCHEN | | |
442 | EDMA_TCC(EDMA_CHAN_SLOT(prtd->ram_channel)); | |
443 | edma_write_slot(link, &prtd->asp_params); | |
444 | ||
445 | /* ram */ | |
446 | link = prtd->ram_link; | |
447 | edma_set_src(link, iram_dma->addr, INCR, W32BIT); | |
448 | edma_set_dest(link, iram_dma->addr, INCR, W32BIT); | |
449 | pr_debug("%s: audio dma channels/slots in use for ram:%u %u %u," | |
450 | "for asp:%u %u %u\n", __func__, | |
451 | prtd->ram_channel, prtd->ram_link, prtd->ram_link2, | |
452 | prtd->asp_channel, prtd->asp_link[0], | |
453 | prtd->asp_link[1]); | |
454 | return 0; | |
455 | exit4: | |
456 | edma_free_channel(prtd->asp_link[1]); | |
457 | prtd->asp_link[1] = -1; | |
458 | exit3: | |
459 | edma_free_channel(prtd->ram_link); | |
460 | prtd->ram_link = -1; | |
461 | exit2: | |
462 | edma_free_channel(prtd->ram_channel); | |
463 | prtd->ram_channel = -1; | |
464 | exit1: | |
465 | return link; | |
466 | } | |
467 | ||
468 | static int davinci_pcm_dma_request(struct snd_pcm_substream *substream) | |
469 | { | |
470 | struct snd_dma_buffer *iram_dma; | |
471 | struct davinci_runtime_data *prtd = substream->runtime->private_data; | |
472 | struct davinci_pcm_dma_params *params = prtd->params; | |
473 | int link; | |
474 | ||
475 | if (!params) | |
476 | return -ENODEV; | |
477 | ||
478 | /* Request asp master DMA channel */ | |
479 | link = prtd->asp_channel = edma_alloc_channel(params->channel, | |
480 | davinci_pcm_dma_irq, substream, | |
481 | prtd->params->asp_chan_q); | |
482 | if (link < 0) | |
483 | goto exit1; | |
484 | ||
485 | /* Request asp link channels */ | |
486 | link = prtd->asp_link[0] = edma_alloc_slot( | |
487 | EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY); | |
488 | if (link < 0) | |
489 | goto exit2; | |
490 | ||
491 | iram_dma = (struct snd_dma_buffer *)substream->dma_buffer.private_data; | |
492 | if (iram_dma) { | |
493 | if (request_ping_pong(substream, prtd, iram_dma) == 0) | |
494 | return 0; | |
495 | printk(KERN_WARNING "%s: dma channel allocation failed," | |
496 | "not using sram\n", __func__); | |
497 | } | |
498 | ||
499 | /* Issue transfer completion IRQ when the channel completes a | |
500 | * transfer, then always reload from the same slot (by a kind | |
501 | * of loopback link). The completion IRQ handler will update | |
502 | * the reload slot with a new buffer. | |
503 | * | |
504 | * REVISIT save p_ram here after setting up everything except | |
505 | * the buffer and its length (ccnt) ... use it as a template | |
506 | * so davinci_pcm_enqueue_dma() takes less time in IRQ. | |
507 | */ | |
508 | edma_read_slot(link, &prtd->asp_params); | |
509 | prtd->asp_params.opt |= TCINTEN | | |
510 | EDMA_TCC(EDMA_CHAN_SLOT(prtd->asp_channel)); | |
511 | prtd->asp_params.link_bcntrld = EDMA_CHAN_SLOT(link) << 5; | |
512 | edma_write_slot(link, &prtd->asp_params); | |
513 | return 0; | |
514 | exit2: | |
515 | edma_free_channel(prtd->asp_channel); | |
516 | prtd->asp_channel = -1; | |
517 | exit1: | |
518 | return link; | |
519 | } | |
520 | ||
521 | static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
522 | { | |
523 | struct davinci_runtime_data *prtd = substream->runtime->private_data; | |
524 | int ret = 0; | |
525 | ||
526 | spin_lock(&prtd->lock); | |
527 | ||
528 | switch (cmd) { | |
529 | case SNDRV_PCM_TRIGGER_START: | |
530 | case SNDRV_PCM_TRIGGER_RESUME: | |
531 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
532 | edma_resume(prtd->asp_channel); | |
533 | break; | |
534 | case SNDRV_PCM_TRIGGER_STOP: | |
535 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
536 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
537 | edma_pause(prtd->asp_channel); | |
538 | break; | |
539 | default: | |
540 | ret = -EINVAL; | |
541 | break; | |
542 | } | |
543 | ||
544 | spin_unlock(&prtd->lock); | |
545 | ||
546 | return ret; | |
547 | } | |
548 | ||
549 | static int davinci_pcm_prepare(struct snd_pcm_substream *substream) | |
550 | { | |
551 | struct davinci_runtime_data *prtd = substream->runtime->private_data; | |
552 | ||
553 | if (prtd->ram_channel >= 0) { | |
554 | int ret = ping_pong_dma_setup(substream); | |
555 | if (ret < 0) | |
556 | return ret; | |
557 | ||
558 | edma_write_slot(prtd->ram_channel, &prtd->ram_params); | |
559 | edma_write_slot(prtd->asp_channel, &prtd->asp_params); | |
560 | ||
561 | print_buf_info(prtd->ram_channel, "ram_channel"); | |
562 | print_buf_info(prtd->ram_link, "ram_link"); | |
563 | print_buf_info(prtd->ram_link2, "ram_link2"); | |
564 | print_buf_info(prtd->asp_channel, "asp_channel"); | |
565 | print_buf_info(prtd->asp_link[0], "asp_link[0]"); | |
566 | print_buf_info(prtd->asp_link[1], "asp_link[1]"); | |
567 | ||
568 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
569 | /* copy 1st iram buffer */ | |
570 | edma_start(prtd->ram_channel); | |
571 | } | |
572 | edma_start(prtd->asp_channel); | |
573 | return 0; | |
574 | } | |
575 | prtd->period = 0; | |
576 | davinci_pcm_enqueue_dma(substream); | |
577 | ||
578 | /* Copy self-linked parameter RAM entry into master channel */ | |
579 | edma_read_slot(prtd->asp_link[0], &prtd->asp_params); | |
580 | edma_write_slot(prtd->asp_channel, &prtd->asp_params); | |
581 | davinci_pcm_enqueue_dma(substream); | |
582 | edma_start(prtd->asp_channel); | |
583 | ||
584 | return 0; | |
585 | } | |
586 | ||
587 | static snd_pcm_uframes_t | |
588 | davinci_pcm_pointer(struct snd_pcm_substream *substream) | |
589 | { | |
590 | struct snd_pcm_runtime *runtime = substream->runtime; | |
591 | struct davinci_runtime_data *prtd = runtime->private_data; | |
592 | unsigned int offset; | |
593 | int asp_count; | |
594 | dma_addr_t asp_src, asp_dst; | |
595 | ||
596 | spin_lock(&prtd->lock); | |
597 | if (prtd->ram_channel >= 0) { | |
598 | int ram_count; | |
599 | int mod_ram; | |
600 | dma_addr_t ram_src, ram_dst; | |
601 | unsigned int period_size = snd_pcm_lib_period_bytes(substream); | |
602 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
603 | /* reading ram before asp should be safe | |
604 | * as long as the asp transfers less than a ping size | |
605 | * of bytes between the 2 reads | |
606 | */ | |
607 | edma_get_position(prtd->ram_channel, | |
608 | &ram_src, &ram_dst); | |
609 | edma_get_position(prtd->asp_channel, | |
610 | &asp_src, &asp_dst); | |
611 | asp_count = asp_src - prtd->asp_params.src; | |
612 | ram_count = ram_src - prtd->ram_params.src; | |
613 | mod_ram = ram_count % period_size; | |
614 | mod_ram -= asp_count; | |
615 | if (mod_ram < 0) | |
616 | mod_ram += period_size; | |
617 | else if (mod_ram == 0) { | |
618 | if (snd_pcm_running(substream)) | |
619 | mod_ram += period_size; | |
620 | } | |
621 | ram_count -= mod_ram; | |
622 | if (ram_count < 0) | |
623 | ram_count += period_size * runtime->periods; | |
624 | } else { | |
625 | edma_get_position(prtd->ram_channel, | |
626 | &ram_src, &ram_dst); | |
627 | ram_count = ram_dst - prtd->ram_params.dst; | |
628 | } | |
629 | asp_count = ram_count; | |
630 | } else { | |
631 | edma_get_position(prtd->asp_channel, &asp_src, &asp_dst); | |
632 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
633 | asp_count = asp_src - runtime->dma_addr; | |
634 | else | |
635 | asp_count = asp_dst - runtime->dma_addr; | |
636 | } | |
637 | spin_unlock(&prtd->lock); | |
638 | ||
639 | offset = bytes_to_frames(runtime, asp_count); | |
640 | if (offset >= runtime->buffer_size) | |
641 | offset = 0; | |
642 | ||
643 | return offset; | |
644 | } | |
645 | ||
646 | static int davinci_pcm_open(struct snd_pcm_substream *substream) | |
647 | { | |
648 | struct snd_pcm_runtime *runtime = substream->runtime; | |
649 | struct davinci_runtime_data *prtd; | |
650 | struct snd_pcm_hardware *ppcm; | |
651 | int ret = 0; | |
652 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
653 | struct davinci_pcm_dma_params *pa; | |
654 | struct davinci_pcm_dma_params *params; | |
655 | ||
656 | pa = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); | |
657 | if (!pa) | |
658 | return -ENODEV; | |
659 | params = &pa[substream->stream]; | |
660 | ||
661 | ppcm = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? | |
662 | &pcm_hardware_playback : &pcm_hardware_capture; | |
663 | allocate_sram(substream, params->sram_size, ppcm); | |
664 | snd_soc_set_runtime_hwparams(substream, ppcm); | |
665 | /* ensure that buffer size is a multiple of period size */ | |
666 | ret = snd_pcm_hw_constraint_integer(runtime, | |
667 | SNDRV_PCM_HW_PARAM_PERIODS); | |
668 | if (ret < 0) | |
669 | return ret; | |
670 | ||
671 | prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL); | |
672 | if (prtd == NULL) | |
673 | return -ENOMEM; | |
674 | ||
675 | spin_lock_init(&prtd->lock); | |
676 | prtd->params = params; | |
677 | prtd->asp_channel = -1; | |
678 | prtd->asp_link[0] = prtd->asp_link[1] = -1; | |
679 | prtd->ram_channel = -1; | |
680 | prtd->ram_link = -1; | |
681 | prtd->ram_link2 = -1; | |
682 | ||
683 | runtime->private_data = prtd; | |
684 | ||
685 | ret = davinci_pcm_dma_request(substream); | |
686 | if (ret) { | |
687 | printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n"); | |
688 | kfree(prtd); | |
689 | } | |
690 | ||
691 | return ret; | |
692 | } | |
693 | ||
694 | static int davinci_pcm_close(struct snd_pcm_substream *substream) | |
695 | { | |
696 | struct snd_pcm_runtime *runtime = substream->runtime; | |
697 | struct davinci_runtime_data *prtd = runtime->private_data; | |
698 | ||
699 | if (prtd->ram_channel >= 0) | |
700 | edma_stop(prtd->ram_channel); | |
701 | if (prtd->asp_channel >= 0) | |
702 | edma_stop(prtd->asp_channel); | |
703 | if (prtd->asp_link[0] >= 0) | |
704 | edma_unlink(prtd->asp_link[0]); | |
705 | if (prtd->asp_link[1] >= 0) | |
706 | edma_unlink(prtd->asp_link[1]); | |
707 | if (prtd->ram_link >= 0) | |
708 | edma_unlink(prtd->ram_link); | |
709 | ||
710 | if (prtd->asp_link[0] >= 0) | |
711 | edma_free_slot(prtd->asp_link[0]); | |
712 | if (prtd->asp_link[1] >= 0) | |
713 | edma_free_slot(prtd->asp_link[1]); | |
714 | if (prtd->asp_channel >= 0) | |
715 | edma_free_channel(prtd->asp_channel); | |
716 | if (prtd->ram_link >= 0) | |
717 | edma_free_slot(prtd->ram_link); | |
718 | if (prtd->ram_link2 >= 0) | |
719 | edma_free_slot(prtd->ram_link2); | |
720 | if (prtd->ram_channel >= 0) | |
721 | edma_free_channel(prtd->ram_channel); | |
722 | ||
723 | kfree(prtd); | |
724 | ||
725 | return 0; | |
726 | } | |
727 | ||
728 | static int davinci_pcm_hw_params(struct snd_pcm_substream *substream, | |
729 | struct snd_pcm_hw_params *hw_params) | |
730 | { | |
731 | return snd_pcm_lib_malloc_pages(substream, | |
732 | params_buffer_bytes(hw_params)); | |
733 | } | |
734 | ||
735 | static int davinci_pcm_hw_free(struct snd_pcm_substream *substream) | |
736 | { | |
737 | return snd_pcm_lib_free_pages(substream); | |
738 | } | |
739 | ||
740 | static int davinci_pcm_mmap(struct snd_pcm_substream *substream, | |
741 | struct vm_area_struct *vma) | |
742 | { | |
743 | struct snd_pcm_runtime *runtime = substream->runtime; | |
744 | ||
745 | return dma_mmap_writecombine(substream->pcm->card->dev, vma, | |
746 | runtime->dma_area, | |
747 | runtime->dma_addr, | |
748 | runtime->dma_bytes); | |
749 | } | |
750 | ||
751 | static struct snd_pcm_ops davinci_pcm_ops = { | |
752 | .open = davinci_pcm_open, | |
753 | .close = davinci_pcm_close, | |
754 | .ioctl = snd_pcm_lib_ioctl, | |
755 | .hw_params = davinci_pcm_hw_params, | |
756 | .hw_free = davinci_pcm_hw_free, | |
757 | .prepare = davinci_pcm_prepare, | |
758 | .trigger = davinci_pcm_trigger, | |
759 | .pointer = davinci_pcm_pointer, | |
760 | .mmap = davinci_pcm_mmap, | |
761 | }; | |
762 | ||
763 | static int davinci_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream, | |
764 | size_t size) | |
765 | { | |
766 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; | |
767 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
768 | ||
769 | buf->dev.type = SNDRV_DMA_TYPE_DEV; | |
770 | buf->dev.dev = pcm->card->dev; | |
771 | buf->private_data = NULL; | |
772 | buf->area = dma_alloc_writecombine(pcm->card->dev, size, | |
773 | &buf->addr, GFP_KERNEL); | |
774 | ||
775 | pr_debug("davinci_pcm: preallocate_dma_buffer: area=%p, addr=%p, " | |
776 | "size=%d\n", (void *) buf->area, (void *) buf->addr, size); | |
777 | ||
778 | if (!buf->area) | |
779 | return -ENOMEM; | |
780 | ||
781 | buf->bytes = size; | |
782 | return 0; | |
783 | } | |
784 | ||
785 | static void davinci_pcm_free(struct snd_pcm *pcm) | |
786 | { | |
787 | struct snd_pcm_substream *substream; | |
788 | struct snd_dma_buffer *buf; | |
789 | int stream; | |
790 | ||
791 | for (stream = 0; stream < 2; stream++) { | |
792 | struct snd_dma_buffer *iram_dma; | |
793 | substream = pcm->streams[stream].substream; | |
794 | if (!substream) | |
795 | continue; | |
796 | ||
797 | buf = &substream->dma_buffer; | |
798 | if (!buf->area) | |
799 | continue; | |
800 | ||
801 | dma_free_writecombine(pcm->card->dev, buf->bytes, | |
802 | buf->area, buf->addr); | |
803 | buf->area = NULL; | |
804 | iram_dma = buf->private_data; | |
805 | if (iram_dma) { | |
806 | sram_free(iram_dma->area, iram_dma->bytes); | |
807 | kfree(iram_dma); | |
808 | } | |
809 | } | |
810 | } | |
811 | ||
812 | static u64 davinci_pcm_dmamask = 0xffffffff; | |
813 | ||
814 | static int davinci_pcm_new(struct snd_card *card, | |
815 | struct snd_soc_dai *dai, struct snd_pcm *pcm) | |
816 | { | |
817 | int ret; | |
818 | ||
819 | if (!card->dev->dma_mask) | |
820 | card->dev->dma_mask = &davinci_pcm_dmamask; | |
821 | if (!card->dev->coherent_dma_mask) | |
822 | card->dev->coherent_dma_mask = 0xffffffff; | |
823 | ||
824 | if (dai->driver->playback.channels_min) { | |
825 | ret = davinci_pcm_preallocate_dma_buffer(pcm, | |
826 | SNDRV_PCM_STREAM_PLAYBACK, | |
827 | pcm_hardware_playback.buffer_bytes_max); | |
828 | if (ret) | |
829 | return ret; | |
830 | } | |
831 | ||
832 | if (dai->driver->capture.channels_min) { | |
833 | ret = davinci_pcm_preallocate_dma_buffer(pcm, | |
834 | SNDRV_PCM_STREAM_CAPTURE, | |
835 | pcm_hardware_capture.buffer_bytes_max); | |
836 | if (ret) | |
837 | return ret; | |
838 | } | |
839 | ||
840 | return 0; | |
841 | } | |
842 | ||
843 | static struct snd_soc_platform_driver davinci_soc_platform = { | |
844 | .ops = &davinci_pcm_ops, | |
845 | .pcm_new = davinci_pcm_new, | |
846 | .pcm_free = davinci_pcm_free, | |
847 | }; | |
848 | ||
849 | static int __devinit davinci_soc_platform_probe(struct platform_device *pdev) | |
850 | { | |
851 | return snd_soc_register_platform(&pdev->dev, &davinci_soc_platform); | |
852 | } | |
853 | ||
854 | static int __devexit davinci_soc_platform_remove(struct platform_device *pdev) | |
855 | { | |
856 | snd_soc_unregister_platform(&pdev->dev); | |
857 | return 0; | |
858 | } | |
859 | ||
860 | static struct platform_driver davinci_pcm_driver = { | |
861 | .driver = { | |
862 | .name = "davinci-pcm-audio", | |
863 | .owner = THIS_MODULE, | |
864 | }, | |
865 | ||
866 | .probe = davinci_soc_platform_probe, | |
867 | .remove = __devexit_p(davinci_soc_platform_remove), | |
868 | }; | |
869 | ||
870 | static int __init snd_davinci_pcm_init(void) | |
871 | { | |
872 | return platform_driver_register(&davinci_pcm_driver); | |
873 | } | |
874 | module_init(snd_davinci_pcm_init); | |
875 | ||
876 | static void __exit snd_davinci_pcm_exit(void) | |
877 | { | |
878 | platform_driver_unregister(&davinci_pcm_driver); | |
879 | } | |
880 | module_exit(snd_davinci_pcm_exit); | |
881 | ||
882 | MODULE_AUTHOR("Vladimir Barinov"); | |
883 | MODULE_DESCRIPTION("TI DAVINCI PCM DMA module"); | |
884 | MODULE_LICENSE("GPL"); |