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17467f23 TT |
1 | /* |
2 | * Freescale DMA ALSA SoC PCM driver | |
3 | * | |
4 | * Author: Timur Tabi <timur@freescale.com> | |
5 | * | |
f0fba2ad LG |
6 | * Copyright 2007-2010 Freescale Semiconductor, Inc. |
7 | * | |
8 | * This file is licensed under the terms of the GNU General Public License | |
9 | * version 2. This program is licensed "as is" without any warranty of any | |
10 | * kind, whether express or implied. | |
17467f23 TT |
11 | * |
12 | * This driver implements ASoC support for the Elo DMA controller, which is | |
13 | * the DMA controller on Freescale 83xx, 85xx, and 86xx SOCs. In ALSA terms, | |
14 | * the PCM driver is what handles the DMA buffer. | |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/dma-mapping.h> | |
21 | #include <linux/interrupt.h> | |
22 | #include <linux/delay.h> | |
5a0e3ad6 | 23 | #include <linux/gfp.h> |
5af50730 RH |
24 | #include <linux/of_address.h> |
25 | #include <linux/of_irq.h> | |
f0fba2ad LG |
26 | #include <linux/of_platform.h> |
27 | #include <linux/list.h> | |
38fec727 | 28 | #include <linux/slab.h> |
17467f23 | 29 | |
17467f23 TT |
30 | #include <sound/core.h> |
31 | #include <sound/pcm.h> | |
32 | #include <sound/pcm_params.h> | |
33 | #include <sound/soc.h> | |
34 | ||
35 | #include <asm/io.h> | |
36 | ||
37 | #include "fsl_dma.h" | |
f0fba2ad | 38 | #include "fsl_ssi.h" /* For the offset of stx0 and srx0 */ |
17467f23 TT |
39 | |
40 | /* | |
41 | * The formats that the DMA controller supports, which is anything | |
42 | * that is 8, 16, or 32 bits. | |
43 | */ | |
44 | #define FSLDMA_PCM_FORMATS (SNDRV_PCM_FMTBIT_S8 | \ | |
45 | SNDRV_PCM_FMTBIT_U8 | \ | |
46 | SNDRV_PCM_FMTBIT_S16_LE | \ | |
47 | SNDRV_PCM_FMTBIT_S16_BE | \ | |
48 | SNDRV_PCM_FMTBIT_U16_LE | \ | |
49 | SNDRV_PCM_FMTBIT_U16_BE | \ | |
50 | SNDRV_PCM_FMTBIT_S24_LE | \ | |
51 | SNDRV_PCM_FMTBIT_S24_BE | \ | |
52 | SNDRV_PCM_FMTBIT_U24_LE | \ | |
53 | SNDRV_PCM_FMTBIT_U24_BE | \ | |
54 | SNDRV_PCM_FMTBIT_S32_LE | \ | |
55 | SNDRV_PCM_FMTBIT_S32_BE | \ | |
56 | SNDRV_PCM_FMTBIT_U32_LE | \ | |
57 | SNDRV_PCM_FMTBIT_U32_BE) | |
f0fba2ad | 58 | struct dma_object { |
f0fba2ad | 59 | struct snd_soc_platform_driver dai; |
17467f23 TT |
60 | dma_addr_t ssi_stx_phys; |
61 | dma_addr_t ssi_srx_phys; | |
8e9d8690 | 62 | unsigned int ssi_fifo_depth; |
f0fba2ad LG |
63 | struct ccsr_dma_channel __iomem *channel; |
64 | unsigned int irq; | |
65 | bool assigned; | |
66 | char path[1]; | |
67 | }; | |
17467f23 TT |
68 | |
69 | /* | |
70 | * The number of DMA links to use. Two is the bare minimum, but if you | |
71 | * have really small links you might need more. | |
72 | */ | |
73 | #define NUM_DMA_LINKS 2 | |
74 | ||
75 | /** fsl_dma_private: p-substream DMA data | |
76 | * | |
77 | * Each substream has a 1-to-1 association with a DMA channel. | |
78 | * | |
79 | * The link[] array is first because it needs to be aligned on a 32-byte | |
80 | * boundary, so putting it first will ensure alignment without padding the | |
81 | * structure. | |
82 | * | |
83 | * @link[]: array of link descriptors | |
17467f23 TT |
84 | * @dma_channel: pointer to the DMA channel's registers |
85 | * @irq: IRQ for this DMA channel | |
86 | * @substream: pointer to the substream object, needed by the ISR | |
87 | * @ssi_sxx_phys: bus address of the STX or SRX register to use | |
88 | * @ld_buf_phys: physical address of the LD buffer | |
89 | * @current_link: index into link[] of the link currently being processed | |
90 | * @dma_buf_phys: physical address of the DMA buffer | |
91 | * @dma_buf_next: physical address of the next period to process | |
92 | * @dma_buf_end: physical address of the byte after the end of the DMA | |
93 | * @buffer period_size: the size of a single period | |
94 | * @num_periods: the number of periods in the DMA buffer | |
95 | */ | |
96 | struct fsl_dma_private { | |
97 | struct fsl_dma_link_descriptor link[NUM_DMA_LINKS]; | |
17467f23 TT |
98 | struct ccsr_dma_channel __iomem *dma_channel; |
99 | unsigned int irq; | |
100 | struct snd_pcm_substream *substream; | |
101 | dma_addr_t ssi_sxx_phys; | |
8e9d8690 | 102 | unsigned int ssi_fifo_depth; |
17467f23 TT |
103 | dma_addr_t ld_buf_phys; |
104 | unsigned int current_link; | |
105 | dma_addr_t dma_buf_phys; | |
106 | dma_addr_t dma_buf_next; | |
107 | dma_addr_t dma_buf_end; | |
108 | size_t period_size; | |
109 | unsigned int num_periods; | |
110 | }; | |
111 | ||
112 | /** | |
113 | * fsl_dma_hardare: define characteristics of the PCM hardware. | |
114 | * | |
115 | * The PCM hardware is the Freescale DMA controller. This structure defines | |
116 | * the capabilities of that hardware. | |
117 | * | |
118 | * Since the sampling rate and data format are not controlled by the DMA | |
119 | * controller, we specify no limits for those values. The only exception is | |
120 | * period_bytes_min, which is set to a reasonably low value to prevent the | |
121 | * DMA controller from generating too many interrupts per second. | |
122 | * | |
123 | * Since each link descriptor has a 32-bit byte count field, we set | |
124 | * period_bytes_max to the largest 32-bit number. We also have no maximum | |
125 | * number of periods. | |
be41e941 TT |
126 | * |
127 | * Note that we specify SNDRV_PCM_INFO_JOINT_DUPLEX here, but only because a | |
128 | * limitation in the SSI driver requires the sample rates for playback and | |
129 | * capture to be the same. | |
17467f23 TT |
130 | */ |
131 | static const struct snd_pcm_hardware fsl_dma_hardware = { | |
132 | ||
4052ce4c TT |
133 | .info = SNDRV_PCM_INFO_INTERLEAVED | |
134 | SNDRV_PCM_INFO_MMAP | | |
be41e941 | 135 | SNDRV_PCM_INFO_MMAP_VALID | |
3a638ff2 TT |
136 | SNDRV_PCM_INFO_JOINT_DUPLEX | |
137 | SNDRV_PCM_INFO_PAUSE, | |
17467f23 | 138 | .formats = FSLDMA_PCM_FORMATS, |
17467f23 TT |
139 | .period_bytes_min = 512, /* A reasonable limit */ |
140 | .period_bytes_max = (u32) -1, | |
141 | .periods_min = NUM_DMA_LINKS, | |
142 | .periods_max = (unsigned int) -1, | |
143 | .buffer_bytes_max = 128 * 1024, /* A reasonable limit */ | |
144 | }; | |
145 | ||
146 | /** | |
147 | * fsl_dma_abort_stream: tell ALSA that the DMA transfer has aborted | |
148 | * | |
149 | * This function should be called by the ISR whenever the DMA controller | |
150 | * halts data transfer. | |
151 | */ | |
152 | static void fsl_dma_abort_stream(struct snd_pcm_substream *substream) | |
153 | { | |
154 | unsigned long flags; | |
155 | ||
156 | snd_pcm_stream_lock_irqsave(substream, flags); | |
157 | ||
158 | if (snd_pcm_running(substream)) | |
159 | snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); | |
160 | ||
161 | snd_pcm_stream_unlock_irqrestore(substream, flags); | |
162 | } | |
163 | ||
164 | /** | |
165 | * fsl_dma_update_pointers - update LD pointers to point to the next period | |
166 | * | |
167 | * As each period is completed, this function changes the the link | |
168 | * descriptor pointers for that period to point to the next period. | |
169 | */ | |
170 | static void fsl_dma_update_pointers(struct fsl_dma_private *dma_private) | |
171 | { | |
172 | struct fsl_dma_link_descriptor *link = | |
173 | &dma_private->link[dma_private->current_link]; | |
174 | ||
1a3c5a49 TT |
175 | /* Update our link descriptors to point to the next period. On a 36-bit |
176 | * system, we also need to update the ESAD bits. We also set (keep) the | |
177 | * snoop bits. See the comments in fsl_dma_hw_params() about snooping. | |
178 | */ | |
179 | if (dma_private->substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
180 | link->source_addr = cpu_to_be32(dma_private->dma_buf_next); | |
181 | #ifdef CONFIG_PHYS_64BIT | |
182 | link->source_attr = cpu_to_be32(CCSR_DMA_ATR_SNOOP | | |
183 | upper_32_bits(dma_private->dma_buf_next)); | |
184 | #endif | |
185 | } else { | |
186 | link->dest_addr = cpu_to_be32(dma_private->dma_buf_next); | |
187 | #ifdef CONFIG_PHYS_64BIT | |
188 | link->dest_attr = cpu_to_be32(CCSR_DMA_ATR_SNOOP | | |
189 | upper_32_bits(dma_private->dma_buf_next)); | |
190 | #endif | |
191 | } | |
17467f23 TT |
192 | |
193 | /* Update our variables for next time */ | |
194 | dma_private->dma_buf_next += dma_private->period_size; | |
195 | ||
196 | if (dma_private->dma_buf_next >= dma_private->dma_buf_end) | |
197 | dma_private->dma_buf_next = dma_private->dma_buf_phys; | |
198 | ||
199 | if (++dma_private->current_link >= NUM_DMA_LINKS) | |
200 | dma_private->current_link = 0; | |
201 | } | |
202 | ||
203 | /** | |
204 | * fsl_dma_isr: interrupt handler for the DMA controller | |
205 | * | |
206 | * @irq: IRQ of the DMA channel | |
207 | * @dev_id: pointer to the dma_private structure for this DMA channel | |
208 | */ | |
209 | static irqreturn_t fsl_dma_isr(int irq, void *dev_id) | |
210 | { | |
211 | struct fsl_dma_private *dma_private = dev_id; | |
f0fba2ad LG |
212 | struct snd_pcm_substream *substream = dma_private->substream; |
213 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
214 | struct device *dev = rtd->platform->dev; | |
17467f23 TT |
215 | struct ccsr_dma_channel __iomem *dma_channel = dma_private->dma_channel; |
216 | irqreturn_t ret = IRQ_NONE; | |
217 | u32 sr, sr2 = 0; | |
218 | ||
219 | /* We got an interrupt, so read the status register to see what we | |
220 | were interrupted for. | |
221 | */ | |
222 | sr = in_be32(&dma_channel->sr); | |
223 | ||
224 | if (sr & CCSR_DMA_SR_TE) { | |
f0fba2ad LG |
225 | dev_err(dev, "dma transmit error\n"); |
226 | fsl_dma_abort_stream(substream); | |
17467f23 TT |
227 | sr2 |= CCSR_DMA_SR_TE; |
228 | ret = IRQ_HANDLED; | |
229 | } | |
230 | ||
231 | if (sr & CCSR_DMA_SR_CH) | |
232 | ret = IRQ_HANDLED; | |
233 | ||
234 | if (sr & CCSR_DMA_SR_PE) { | |
f0fba2ad LG |
235 | dev_err(dev, "dma programming error\n"); |
236 | fsl_dma_abort_stream(substream); | |
17467f23 TT |
237 | sr2 |= CCSR_DMA_SR_PE; |
238 | ret = IRQ_HANDLED; | |
239 | } | |
240 | ||
241 | if (sr & CCSR_DMA_SR_EOLNI) { | |
242 | sr2 |= CCSR_DMA_SR_EOLNI; | |
243 | ret = IRQ_HANDLED; | |
244 | } | |
245 | ||
246 | if (sr & CCSR_DMA_SR_CB) | |
247 | ret = IRQ_HANDLED; | |
248 | ||
249 | if (sr & CCSR_DMA_SR_EOSI) { | |
17467f23 TT |
250 | /* Tell ALSA we completed a period. */ |
251 | snd_pcm_period_elapsed(substream); | |
252 | ||
253 | /* | |
254 | * Update our link descriptors to point to the next period. We | |
255 | * only need to do this if the number of periods is not equal to | |
256 | * the number of links. | |
257 | */ | |
258 | if (dma_private->num_periods != NUM_DMA_LINKS) | |
259 | fsl_dma_update_pointers(dma_private); | |
260 | ||
261 | sr2 |= CCSR_DMA_SR_EOSI; | |
262 | ret = IRQ_HANDLED; | |
263 | } | |
264 | ||
265 | if (sr & CCSR_DMA_SR_EOLSI) { | |
266 | sr2 |= CCSR_DMA_SR_EOLSI; | |
267 | ret = IRQ_HANDLED; | |
268 | } | |
269 | ||
270 | /* Clear the bits that we set */ | |
271 | if (sr2) | |
272 | out_be32(&dma_channel->sr, sr2); | |
273 | ||
274 | return ret; | |
275 | } | |
276 | ||
277 | /** | |
278 | * fsl_dma_new: initialize this PCM driver. | |
279 | * | |
280 | * This function is called when the codec driver calls snd_soc_new_pcms(), | |
87506549 | 281 | * once for each .dai_link in the machine driver's snd_soc_card |
17467f23 | 282 | * structure. |
1a3c5a49 TT |
283 | * |
284 | * snd_dma_alloc_pages() is just a front-end to dma_alloc_coherent(), which | |
285 | * (currently) always allocates the DMA buffer in lowmem, even if GFP_HIGHMEM | |
286 | * is specified. Therefore, any DMA buffers we allocate will always be in low | |
287 | * memory, but we support for 36-bit physical addresses anyway. | |
288 | * | |
289 | * Regardless of where the memory is actually allocated, since the device can | |
290 | * technically DMA to any 36-bit address, we do need to set the DMA mask to 36. | |
17467f23 | 291 | */ |
552d1ef6 | 292 | static int fsl_dma_new(struct snd_soc_pcm_runtime *rtd) |
17467f23 | 293 | { |
552d1ef6 | 294 | struct snd_card *card = rtd->card->snd_card; |
552d1ef6 | 295 | struct snd_pcm *pcm = rtd->pcm; |
17467f23 TT |
296 | int ret; |
297 | ||
c9bd5e69 RK |
298 | ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(36)); |
299 | if (ret) | |
300 | return ret; | |
17467f23 | 301 | |
c04019d4 TT |
302 | /* Some codecs have separate DAIs for playback and capture, so we |
303 | * should allocate a DMA buffer only for the streams that are valid. | |
304 | */ | |
305 | ||
6296914c | 306 | if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { |
c04019d4 TT |
307 | ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, card->dev, |
308 | fsl_dma_hardware.buffer_bytes_max, | |
6296914c | 309 | &pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->dma_buffer); |
c04019d4 TT |
310 | if (ret) { |
311 | dev_err(card->dev, "can't alloc playback dma buffer\n"); | |
312 | return ret; | |
313 | } | |
17467f23 TT |
314 | } |
315 | ||
6296914c | 316 | if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { |
c04019d4 TT |
317 | ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, card->dev, |
318 | fsl_dma_hardware.buffer_bytes_max, | |
6296914c | 319 | &pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->dma_buffer); |
c04019d4 | 320 | if (ret) { |
c04019d4 | 321 | dev_err(card->dev, "can't alloc capture dma buffer\n"); |
6296914c | 322 | snd_dma_free_pages(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->dma_buffer); |
c04019d4 TT |
323 | return ret; |
324 | } | |
17467f23 TT |
325 | } |
326 | ||
327 | return 0; | |
328 | } | |
329 | ||
330 | /** | |
331 | * fsl_dma_open: open a new substream. | |
332 | * | |
333 | * Each substream has its own DMA buffer. | |
bf9c8c9d TT |
334 | * |
335 | * ALSA divides the DMA buffer into N periods. We create NUM_DMA_LINKS link | |
336 | * descriptors that ping-pong from one period to the next. For example, if | |
337 | * there are six periods and two link descriptors, this is how they look | |
338 | * before playback starts: | |
339 | * | |
340 | * The last link descriptor | |
341 | * ____________ points back to the first | |
342 | * | | | |
343 | * V | | |
344 | * ___ ___ | | |
345 | * | |->| |->| | |
346 | * |___| |___| | |
347 | * | | | |
348 | * | | | |
349 | * V V | |
350 | * _________________________________________ | |
351 | * | | | | | | | The DMA buffer is | |
352 | * | | | | | | | divided into 6 parts | |
353 | * |______|______|______|______|______|______| | |
354 | * | |
355 | * and here's how they look after the first period is finished playing: | |
356 | * | |
357 | * ____________ | |
358 | * | | | |
359 | * V | | |
360 | * ___ ___ | | |
361 | * | |->| |->| | |
362 | * |___| |___| | |
363 | * | | | |
364 | * |______________ | |
365 | * | | | |
366 | * V V | |
367 | * _________________________________________ | |
368 | * | | | | | | | | |
369 | * | | | | | | | | |
370 | * |______|______|______|______|______|______| | |
371 | * | |
372 | * The first link descriptor now points to the third period. The DMA | |
373 | * controller is currently playing the second period. When it finishes, it | |
374 | * will jump back to the first descriptor and play the third period. | |
375 | * | |
376 | * There are four reasons we do this: | |
377 | * | |
378 | * 1. The only way to get the DMA controller to automatically restart the | |
379 | * transfer when it gets to the end of the buffer is to use chaining | |
380 | * mode. Basic direct mode doesn't offer that feature. | |
381 | * 2. We need to receive an interrupt at the end of every period. The DMA | |
382 | * controller can generate an interrupt at the end of every link transfer | |
383 | * (aka segment). Making each period into a DMA segment will give us the | |
384 | * interrupts we need. | |
385 | * 3. By creating only two link descriptors, regardless of the number of | |
386 | * periods, we do not need to reallocate the link descriptors if the | |
387 | * number of periods changes. | |
388 | * 4. All of the audio data is still stored in a single, contiguous DMA | |
389 | * buffer, which is what ALSA expects. We're just dividing it into | |
390 | * contiguous parts, and creating a link descriptor for each one. | |
17467f23 TT |
391 | */ |
392 | static int fsl_dma_open(struct snd_pcm_substream *substream) | |
393 | { | |
394 | struct snd_pcm_runtime *runtime = substream->runtime; | |
f0fba2ad LG |
395 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
396 | struct device *dev = rtd->platform->dev; | |
397 | struct dma_object *dma = | |
398 | container_of(rtd->platform->driver, struct dma_object, dai); | |
17467f23 | 399 | struct fsl_dma_private *dma_private; |
bf9c8c9d | 400 | struct ccsr_dma_channel __iomem *dma_channel; |
17467f23 | 401 | dma_addr_t ld_buf_phys; |
bf9c8c9d TT |
402 | u64 temp_link; /* Pointer to next link descriptor */ |
403 | u32 mr; | |
17467f23 TT |
404 | unsigned int channel; |
405 | int ret = 0; | |
bf9c8c9d | 406 | unsigned int i; |
17467f23 TT |
407 | |
408 | /* | |
409 | * Reject any DMA buffer whose size is not a multiple of the period | |
410 | * size. We need to make sure that the DMA buffer can be evenly divided | |
411 | * into periods. | |
412 | */ | |
413 | ret = snd_pcm_hw_constraint_integer(runtime, | |
414 | SNDRV_PCM_HW_PARAM_PERIODS); | |
415 | if (ret < 0) { | |
f0fba2ad | 416 | dev_err(dev, "invalid buffer size\n"); |
17467f23 TT |
417 | return ret; |
418 | } | |
419 | ||
420 | channel = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1; | |
421 | ||
f0fba2ad LG |
422 | if (dma->assigned) { |
423 | dev_err(dev, "dma channel already assigned\n"); | |
17467f23 TT |
424 | return -EBUSY; |
425 | } | |
426 | ||
f0fba2ad LG |
427 | dma_private = dma_alloc_coherent(dev, sizeof(struct fsl_dma_private), |
428 | &ld_buf_phys, GFP_KERNEL); | |
17467f23 | 429 | if (!dma_private) { |
f0fba2ad | 430 | dev_err(dev, "can't allocate dma private data\n"); |
17467f23 TT |
431 | return -ENOMEM; |
432 | } | |
433 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
f0fba2ad | 434 | dma_private->ssi_sxx_phys = dma->ssi_stx_phys; |
17467f23 | 435 | else |
f0fba2ad | 436 | dma_private->ssi_sxx_phys = dma->ssi_srx_phys; |
17467f23 | 437 | |
8e9d8690 | 438 | dma_private->ssi_fifo_depth = dma->ssi_fifo_depth; |
f0fba2ad LG |
439 | dma_private->dma_channel = dma->channel; |
440 | dma_private->irq = dma->irq; | |
17467f23 TT |
441 | dma_private->substream = substream; |
442 | dma_private->ld_buf_phys = ld_buf_phys; | |
443 | dma_private->dma_buf_phys = substream->dma_buffer.addr; | |
444 | ||
0cd114ff TT |
445 | ret = request_irq(dma_private->irq, fsl_dma_isr, 0, "fsldma-audio", |
446 | dma_private); | |
17467f23 | 447 | if (ret) { |
f0fba2ad | 448 | dev_err(dev, "can't register ISR for IRQ %u (ret=%i)\n", |
17467f23 | 449 | dma_private->irq, ret); |
f0fba2ad | 450 | dma_free_coherent(dev, sizeof(struct fsl_dma_private), |
17467f23 TT |
451 | dma_private, dma_private->ld_buf_phys); |
452 | return ret; | |
453 | } | |
454 | ||
f0fba2ad | 455 | dma->assigned = 1; |
17467f23 TT |
456 | |
457 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); | |
458 | snd_soc_set_runtime_hwparams(substream, &fsl_dma_hardware); | |
459 | runtime->private_data = dma_private; | |
460 | ||
bf9c8c9d TT |
461 | /* Program the fixed DMA controller parameters */ |
462 | ||
463 | dma_channel = dma_private->dma_channel; | |
464 | ||
465 | temp_link = dma_private->ld_buf_phys + | |
466 | sizeof(struct fsl_dma_link_descriptor); | |
467 | ||
468 | for (i = 0; i < NUM_DMA_LINKS; i++) { | |
85ef2375 | 469 | dma_private->link[i].next = cpu_to_be64(temp_link); |
bf9c8c9d TT |
470 | |
471 | temp_link += sizeof(struct fsl_dma_link_descriptor); | |
472 | } | |
473 | /* The last link descriptor points to the first */ | |
474 | dma_private->link[i - 1].next = cpu_to_be64(dma_private->ld_buf_phys); | |
475 | ||
476 | /* Tell the DMA controller where the first link descriptor is */ | |
477 | out_be32(&dma_channel->clndar, | |
478 | CCSR_DMA_CLNDAR_ADDR(dma_private->ld_buf_phys)); | |
479 | out_be32(&dma_channel->eclndar, | |
480 | CCSR_DMA_ECLNDAR_ADDR(dma_private->ld_buf_phys)); | |
481 | ||
482 | /* The manual says the BCR must be clear before enabling EMP */ | |
483 | out_be32(&dma_channel->bcr, 0); | |
484 | ||
485 | /* | |
486 | * Program the mode register for interrupts, external master control, | |
487 | * and source/destination hold. Also clear the Channel Abort bit. | |
488 | */ | |
489 | mr = in_be32(&dma_channel->mr) & | |
490 | ~(CCSR_DMA_MR_CA | CCSR_DMA_MR_DAHE | CCSR_DMA_MR_SAHE); | |
491 | ||
492 | /* | |
493 | * We want External Master Start and External Master Pause enabled, | |
494 | * because the SSI is controlling the DMA controller. We want the DMA | |
495 | * controller to be set up in advance, and then we signal only the SSI | |
496 | * to start transferring. | |
497 | * | |
498 | * We want End-Of-Segment Interrupts enabled, because this will generate | |
499 | * an interrupt at the end of each segment (each link descriptor | |
500 | * represents one segment). Each DMA segment is the same thing as an | |
501 | * ALSA period, so this is how we get an interrupt at the end of every | |
502 | * period. | |
503 | * | |
504 | * We want Error Interrupt enabled, so that we can get an error if | |
505 | * the DMA controller is mis-programmed somehow. | |
506 | */ | |
507 | mr |= CCSR_DMA_MR_EOSIE | CCSR_DMA_MR_EIE | CCSR_DMA_MR_EMP_EN | | |
508 | CCSR_DMA_MR_EMS_EN; | |
509 | ||
510 | /* For playback, we want the destination address to be held. For | |
511 | capture, set the source address to be held. */ | |
512 | mr |= (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? | |
513 | CCSR_DMA_MR_DAHE : CCSR_DMA_MR_SAHE; | |
514 | ||
515 | out_be32(&dma_channel->mr, mr); | |
516 | ||
17467f23 TT |
517 | return 0; |
518 | } | |
519 | ||
520 | /** | |
bf9c8c9d | 521 | * fsl_dma_hw_params: continue initializing the DMA links |
17467f23 | 522 | * |
bf9c8c9d TT |
523 | * This function obtains hardware parameters about the opened stream and |
524 | * programs the DMA controller accordingly. | |
17467f23 | 525 | * |
85ef2375 TT |
526 | * One drawback of big-endian is that when copying integers of different |
527 | * sizes to a fixed-sized register, the address to which the integer must be | |
528 | * copied is dependent on the size of the integer. | |
17467f23 TT |
529 | * |
530 | * For example, if P is the address of a 32-bit register, and X is a 32-bit | |
531 | * integer, then X should be copied to address P. However, if X is a 16-bit | |
532 | * integer, then it should be copied to P+2. If X is an 8-bit register, | |
533 | * then it should be copied to P+3. | |
534 | * | |
535 | * So for playback of 8-bit samples, the DMA controller must transfer single | |
536 | * bytes from the DMA buffer to the last byte of the STX0 register, i.e. | |
537 | * offset by 3 bytes. For 16-bit samples, the offset is two bytes. | |
538 | * | |
539 | * For 24-bit samples, the offset is 1 byte. However, the DMA controller | |
540 | * does not support 3-byte copies (the DAHTS register supports only 1, 2, 4, | |
541 | * and 8 bytes at a time). So we do not support packed 24-bit samples. | |
542 | * 24-bit data must be padded to 32 bits. | |
543 | */ | |
85ef2375 TT |
544 | static int fsl_dma_hw_params(struct snd_pcm_substream *substream, |
545 | struct snd_pcm_hw_params *hw_params) | |
17467f23 TT |
546 | { |
547 | struct snd_pcm_runtime *runtime = substream->runtime; | |
548 | struct fsl_dma_private *dma_private = runtime->private_data; | |
f0fba2ad LG |
549 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
550 | struct device *dev = rtd->platform->dev; | |
85ef2375 TT |
551 | |
552 | /* Number of bits per sample */ | |
8e9d8690 | 553 | unsigned int sample_bits = |
85ef2375 TT |
554 | snd_pcm_format_physical_width(params_format(hw_params)); |
555 | ||
556 | /* Number of bytes per frame */ | |
8e9d8690 | 557 | unsigned int sample_bytes = sample_bits / 8; |
85ef2375 TT |
558 | |
559 | /* Bus address of SSI STX register */ | |
560 | dma_addr_t ssi_sxx_phys = dma_private->ssi_sxx_phys; | |
561 | ||
562 | /* Size of the DMA buffer, in bytes */ | |
563 | size_t buffer_size = params_buffer_bytes(hw_params); | |
564 | ||
565 | /* Number of bytes per period */ | |
566 | size_t period_size = params_period_bytes(hw_params); | |
567 | ||
568 | /* Pointer to next period */ | |
569 | dma_addr_t temp_addr = substream->dma_buffer.addr; | |
570 | ||
571 | /* Pointer to DMA controller */ | |
17467f23 | 572 | struct ccsr_dma_channel __iomem *dma_channel = dma_private->dma_channel; |
85ef2375 TT |
573 | |
574 | u32 mr; /* DMA Mode Register */ | |
575 | ||
17467f23 | 576 | unsigned int i; |
17467f23 | 577 | |
85ef2375 TT |
578 | /* Initialize our DMA tracking variables */ |
579 | dma_private->period_size = period_size; | |
580 | dma_private->num_periods = params_periods(hw_params); | |
581 | dma_private->dma_buf_end = dma_private->dma_buf_phys + buffer_size; | |
582 | dma_private->dma_buf_next = dma_private->dma_buf_phys + | |
583 | (NUM_DMA_LINKS * period_size); | |
584 | ||
585 | if (dma_private->dma_buf_next >= dma_private->dma_buf_end) | |
586 | /* This happens if the number of periods == NUM_DMA_LINKS */ | |
587 | dma_private->dma_buf_next = dma_private->dma_buf_phys; | |
17467f23 TT |
588 | |
589 | mr = in_be32(&dma_channel->mr) & ~(CCSR_DMA_MR_BWC_MASK | | |
590 | CCSR_DMA_MR_SAHTS_MASK | CCSR_DMA_MR_DAHTS_MASK); | |
591 | ||
85ef2375 TT |
592 | /* Due to a quirk of the SSI's STX register, the target address |
593 | * for the DMA operations depends on the sample size. So we calculate | |
594 | * that offset here. While we're at it, also tell the DMA controller | |
595 | * how much data to transfer per sample. | |
596 | */ | |
8e9d8690 | 597 | switch (sample_bits) { |
17467f23 TT |
598 | case 8: |
599 | mr |= CCSR_DMA_MR_DAHTS_1 | CCSR_DMA_MR_SAHTS_1; | |
600 | ssi_sxx_phys += 3; | |
601 | break; | |
602 | case 16: | |
603 | mr |= CCSR_DMA_MR_DAHTS_2 | CCSR_DMA_MR_SAHTS_2; | |
604 | ssi_sxx_phys += 2; | |
605 | break; | |
606 | case 32: | |
607 | mr |= CCSR_DMA_MR_DAHTS_4 | CCSR_DMA_MR_SAHTS_4; | |
608 | break; | |
609 | default: | |
85ef2375 | 610 | /* We should never get here */ |
8e9d8690 | 611 | dev_err(dev, "unsupported sample size %u\n", sample_bits); |
17467f23 TT |
612 | return -EINVAL; |
613 | } | |
614 | ||
17467f23 | 615 | /* |
8e9d8690 TT |
616 | * BWC determines how many bytes are sent/received before the DMA |
617 | * controller checks the SSI to see if it needs to stop. BWC should | |
618 | * always be a multiple of the frame size, so that we always transmit | |
619 | * whole frames. Each frame occupies two slots in the FIFO. The | |
620 | * parameter for CCSR_DMA_MR_BWC() is rounded down the next power of two | |
621 | * (MR[BWC] can only represent even powers of two). | |
622 | * | |
623 | * To simplify the process, we set BWC to the largest value that is | |
624 | * less than or equal to the FIFO watermark. For playback, this ensures | |
625 | * that we transfer the maximum amount without overrunning the FIFO. | |
626 | * For capture, this ensures that we transfer the maximum amount without | |
627 | * underrunning the FIFO. | |
628 | * | |
629 | * f = SSI FIFO depth | |
630 | * w = SSI watermark value (which equals f - 2) | |
631 | * b = DMA bandwidth count (in bytes) | |
632 | * s = sample size (in bytes, which equals frame_size * 2) | |
633 | * | |
634 | * For playback, we never transmit more than the transmit FIFO | |
635 | * watermark, otherwise we might write more data than the FIFO can hold. | |
636 | * The watermark is equal to the FIFO depth minus two. | |
637 | * | |
638 | * For capture, two equations must hold: | |
639 | * w > f - (b / s) | |
640 | * w >= b / s | |
641 | * | |
642 | * So, b > 2 * s, but b must also be <= s * w. To simplify, we set | |
643 | * b = s * w, which is equal to | |
644 | * (dma_private->ssi_fifo_depth - 2) * sample_bytes. | |
17467f23 | 645 | */ |
8e9d8690 | 646 | mr |= CCSR_DMA_MR_BWC((dma_private->ssi_fifo_depth - 2) * sample_bytes); |
17467f23 TT |
647 | |
648 | out_be32(&dma_channel->mr, mr); | |
649 | ||
17467f23 TT |
650 | for (i = 0; i < NUM_DMA_LINKS; i++) { |
651 | struct fsl_dma_link_descriptor *link = &dma_private->link[i]; | |
652 | ||
85ef2375 TT |
653 | link->count = cpu_to_be32(period_size); |
654 | ||
1a3c5a49 | 655 | /* The snoop bit tells the DMA controller whether it should tell |
85ef2375 TT |
656 | * the ECM to snoop during a read or write to an address. For |
657 | * audio, we use DMA to transfer data between memory and an I/O | |
658 | * device (the SSI's STX0 or SRX0 register). Snooping is only | |
659 | * needed if there is a cache, so we need to snoop memory | |
660 | * addresses only. For playback, that means we snoop the source | |
661 | * but not the destination. For capture, we snoop the | |
662 | * destination but not the source. | |
663 | * | |
664 | * Note that failing to snoop properly is unlikely to cause | |
665 | * cache incoherency if the period size is larger than the | |
666 | * size of L1 cache. This is because filling in one period will | |
667 | * flush out the data for the previous period. So if you | |
668 | * increased period_bytes_min to a large enough size, you might | |
669 | * get more performance by not snooping, and you'll still be | |
1a3c5a49 | 670 | * okay. You'll need to update fsl_dma_update_pointers() also. |
85ef2375 TT |
671 | */ |
672 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
673 | link->source_addr = cpu_to_be32(temp_addr); | |
1a3c5a49 TT |
674 | link->source_attr = cpu_to_be32(CCSR_DMA_ATR_SNOOP | |
675 | upper_32_bits(temp_addr)); | |
85ef2375 | 676 | |
17467f23 | 677 | link->dest_addr = cpu_to_be32(ssi_sxx_phys); |
1a3c5a49 TT |
678 | link->dest_attr = cpu_to_be32(CCSR_DMA_ATR_NOSNOOP | |
679 | upper_32_bits(ssi_sxx_phys)); | |
85ef2375 | 680 | } else { |
17467f23 | 681 | link->source_addr = cpu_to_be32(ssi_sxx_phys); |
1a3c5a49 TT |
682 | link->source_attr = cpu_to_be32(CCSR_DMA_ATR_NOSNOOP | |
683 | upper_32_bits(ssi_sxx_phys)); | |
85ef2375 TT |
684 | |
685 | link->dest_addr = cpu_to_be32(temp_addr); | |
1a3c5a49 TT |
686 | link->dest_attr = cpu_to_be32(CCSR_DMA_ATR_SNOOP | |
687 | upper_32_bits(temp_addr)); | |
85ef2375 TT |
688 | } |
689 | ||
690 | temp_addr += period_size; | |
17467f23 TT |
691 | } |
692 | ||
693 | return 0; | |
694 | } | |
695 | ||
696 | /** | |
697 | * fsl_dma_pointer: determine the current position of the DMA transfer | |
698 | * | |
699 | * This function is called by ALSA when ALSA wants to know where in the | |
700 | * stream buffer the hardware currently is. | |
701 | * | |
702 | * For playback, the SAR register contains the physical address of the most | |
703 | * recent DMA transfer. For capture, the value is in the DAR register. | |
704 | * | |
705 | * The base address of the buffer is stored in the source_addr field of the | |
706 | * first link descriptor. | |
707 | */ | |
708 | static snd_pcm_uframes_t fsl_dma_pointer(struct snd_pcm_substream *substream) | |
709 | { | |
710 | struct snd_pcm_runtime *runtime = substream->runtime; | |
711 | struct fsl_dma_private *dma_private = runtime->private_data; | |
f0fba2ad LG |
712 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
713 | struct device *dev = rtd->platform->dev; | |
17467f23 TT |
714 | struct ccsr_dma_channel __iomem *dma_channel = dma_private->dma_channel; |
715 | dma_addr_t position; | |
716 | snd_pcm_uframes_t frames; | |
717 | ||
1a3c5a49 TT |
718 | /* Obtain the current DMA pointer, but don't read the ESAD bits if we |
719 | * only have 32-bit DMA addresses. This function is typically called | |
720 | * in interrupt context, so we need to optimize it. | |
721 | */ | |
722 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
17467f23 | 723 | position = in_be32(&dma_channel->sar); |
1a3c5a49 TT |
724 | #ifdef CONFIG_PHYS_64BIT |
725 | position |= (u64)(in_be32(&dma_channel->satr) & | |
726 | CCSR_DMA_ATR_ESAD_MASK) << 32; | |
727 | #endif | |
728 | } else { | |
17467f23 | 729 | position = in_be32(&dma_channel->dar); |
1a3c5a49 TT |
730 | #ifdef CONFIG_PHYS_64BIT |
731 | position |= (u64)(in_be32(&dma_channel->datr) & | |
732 | CCSR_DMA_ATR_ESAD_MASK) << 32; | |
733 | #endif | |
734 | } | |
17467f23 | 735 | |
a4d11fe5 TT |
736 | /* |
737 | * When capture is started, the SSI immediately starts to fill its FIFO. | |
738 | * This means that the DMA controller is not started until the FIFO is | |
739 | * full. However, ALSA calls this function before that happens, when | |
740 | * MR.DAR is still zero. In this case, just return zero to indicate | |
741 | * that nothing has been received yet. | |
742 | */ | |
743 | if (!position) | |
744 | return 0; | |
745 | ||
746 | if ((position < dma_private->dma_buf_phys) || | |
747 | (position > dma_private->dma_buf_end)) { | |
f0fba2ad | 748 | dev_err(dev, "dma pointer is out of range, halting stream\n"); |
a4d11fe5 TT |
749 | return SNDRV_PCM_POS_XRUN; |
750 | } | |
751 | ||
17467f23 TT |
752 | frames = bytes_to_frames(runtime, position - dma_private->dma_buf_phys); |
753 | ||
754 | /* | |
755 | * If the current address is just past the end of the buffer, wrap it | |
756 | * around. | |
757 | */ | |
758 | if (frames == runtime->buffer_size) | |
759 | frames = 0; | |
760 | ||
761 | return frames; | |
762 | } | |
763 | ||
764 | /** | |
765 | * fsl_dma_hw_free: release resources allocated in fsl_dma_hw_params() | |
766 | * | |
767 | * Release the resources allocated in fsl_dma_hw_params() and de-program the | |
768 | * registers. | |
769 | * | |
770 | * This function can be called multiple times. | |
771 | */ | |
772 | static int fsl_dma_hw_free(struct snd_pcm_substream *substream) | |
773 | { | |
774 | struct snd_pcm_runtime *runtime = substream->runtime; | |
775 | struct fsl_dma_private *dma_private = runtime->private_data; | |
776 | ||
777 | if (dma_private) { | |
778 | struct ccsr_dma_channel __iomem *dma_channel; | |
779 | ||
780 | dma_channel = dma_private->dma_channel; | |
781 | ||
782 | /* Stop the DMA */ | |
783 | out_be32(&dma_channel->mr, CCSR_DMA_MR_CA); | |
784 | out_be32(&dma_channel->mr, 0); | |
785 | ||
786 | /* Reset all the other registers */ | |
787 | out_be32(&dma_channel->sr, -1); | |
788 | out_be32(&dma_channel->clndar, 0); | |
789 | out_be32(&dma_channel->eclndar, 0); | |
790 | out_be32(&dma_channel->satr, 0); | |
791 | out_be32(&dma_channel->sar, 0); | |
792 | out_be32(&dma_channel->datr, 0); | |
793 | out_be32(&dma_channel->dar, 0); | |
794 | out_be32(&dma_channel->bcr, 0); | |
795 | out_be32(&dma_channel->nlndar, 0); | |
796 | out_be32(&dma_channel->enlndar, 0); | |
797 | } | |
798 | ||
799 | return 0; | |
800 | } | |
801 | ||
802 | /** | |
803 | * fsl_dma_close: close the stream. | |
804 | */ | |
805 | static int fsl_dma_close(struct snd_pcm_substream *substream) | |
806 | { | |
807 | struct snd_pcm_runtime *runtime = substream->runtime; | |
808 | struct fsl_dma_private *dma_private = runtime->private_data; | |
f0fba2ad LG |
809 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
810 | struct device *dev = rtd->platform->dev; | |
811 | struct dma_object *dma = | |
812 | container_of(rtd->platform->driver, struct dma_object, dai); | |
17467f23 TT |
813 | |
814 | if (dma_private) { | |
815 | if (dma_private->irq) | |
816 | free_irq(dma_private->irq, dma_private); | |
817 | ||
17467f23 | 818 | /* Deallocate the fsl_dma_private structure */ |
f0fba2ad LG |
819 | dma_free_coherent(dev, sizeof(struct fsl_dma_private), |
820 | dma_private, dma_private->ld_buf_phys); | |
17467f23 TT |
821 | substream->runtime->private_data = NULL; |
822 | } | |
823 | ||
f0fba2ad | 824 | dma->assigned = 0; |
17467f23 TT |
825 | |
826 | return 0; | |
827 | } | |
828 | ||
829 | /* | |
830 | * Remove this PCM driver. | |
831 | */ | |
832 | static void fsl_dma_free_dma_buffers(struct snd_pcm *pcm) | |
833 | { | |
834 | struct snd_pcm_substream *substream; | |
835 | unsigned int i; | |
836 | ||
837 | for (i = 0; i < ARRAY_SIZE(pcm->streams); i++) { | |
838 | substream = pcm->streams[i].substream; | |
839 | if (substream) { | |
840 | snd_dma_free_pages(&substream->dma_buffer); | |
841 | substream->dma_buffer.area = NULL; | |
842 | substream->dma_buffer.addr = 0; | |
843 | } | |
844 | } | |
845 | } | |
846 | ||
f0fba2ad | 847 | /** |
05004cb4 | 848 | * find_ssi_node -- returns the SSI node that points to its DMA channel node |
f0fba2ad LG |
849 | * |
850 | * Although this DMA driver attempts to operate independently of the other | |
851 | * devices, it still needs to determine some information about the SSI device | |
852 | * that it's working with. Unfortunately, the device tree does not contain | |
853 | * a pointer from the DMA channel node to the SSI node -- the pointer goes the | |
854 | * other way. So we need to scan the device tree for SSI nodes until we find | |
855 | * the one that points to the given DMA channel node. It's ugly, but at least | |
856 | * it's contained in this one function. | |
857 | */ | |
858 | static struct device_node *find_ssi_node(struct device_node *dma_channel_np) | |
859 | { | |
860 | struct device_node *ssi_np, *np; | |
861 | ||
862 | for_each_compatible_node(ssi_np, NULL, "fsl,mpc8610-ssi") { | |
863 | /* Check each DMA phandle to see if it points to us. We | |
864 | * assume that device_node pointers are a valid comparison. | |
865 | */ | |
866 | np = of_parse_phandle(ssi_np, "fsl,playback-dma", 0); | |
81a081ff | 867 | of_node_put(np); |
f0fba2ad LG |
868 | if (np == dma_channel_np) |
869 | return ssi_np; | |
870 | ||
871 | np = of_parse_phandle(ssi_np, "fsl,capture-dma", 0); | |
81a081ff | 872 | of_node_put(np); |
f0fba2ad LG |
873 | if (np == dma_channel_np) |
874 | return ssi_np; | |
875 | } | |
876 | ||
877 | return NULL; | |
878 | } | |
879 | ||
17467f23 TT |
880 | static struct snd_pcm_ops fsl_dma_ops = { |
881 | .open = fsl_dma_open, | |
882 | .close = fsl_dma_close, | |
883 | .ioctl = snd_pcm_lib_ioctl, | |
884 | .hw_params = fsl_dma_hw_params, | |
885 | .hw_free = fsl_dma_hw_free, | |
17467f23 TT |
886 | .pointer = fsl_dma_pointer, |
887 | }; | |
888 | ||
a0a3d518 | 889 | static int fsl_soc_dma_probe(struct platform_device *pdev) |
f0fba2ad LG |
890 | { |
891 | struct dma_object *dma; | |
38fec727 | 892 | struct device_node *np = pdev->dev.of_node; |
f0fba2ad LG |
893 | struct device_node *ssi_np; |
894 | struct resource res; | |
8e9d8690 | 895 | const uint32_t *iprop; |
f0fba2ad | 896 | int ret; |
17467f23 | 897 | |
f0fba2ad LG |
898 | /* Find the SSI node that points to us. */ |
899 | ssi_np = find_ssi_node(np); | |
900 | if (!ssi_np) { | |
38fec727 | 901 | dev_err(&pdev->dev, "cannot find parent SSI node\n"); |
f0fba2ad LG |
902 | return -ENODEV; |
903 | } | |
904 | ||
905 | ret = of_address_to_resource(ssi_np, 0, &res); | |
f0fba2ad | 906 | if (ret) { |
38fec727 | 907 | dev_err(&pdev->dev, "could not determine resources for %s\n", |
8e9d8690 TT |
908 | ssi_np->full_name); |
909 | of_node_put(ssi_np); | |
f0fba2ad LG |
910 | return ret; |
911 | } | |
912 | ||
913 | dma = kzalloc(sizeof(*dma) + strlen(np->full_name), GFP_KERNEL); | |
914 | if (!dma) { | |
38fec727 | 915 | dev_err(&pdev->dev, "could not allocate dma object\n"); |
8e9d8690 | 916 | of_node_put(ssi_np); |
f0fba2ad LG |
917 | return -ENOMEM; |
918 | } | |
919 | ||
920 | strcpy(dma->path, np->full_name); | |
921 | dma->dai.ops = &fsl_dma_ops; | |
922 | dma->dai.pcm_new = fsl_dma_new; | |
923 | dma->dai.pcm_free = fsl_dma_free_dma_buffers; | |
924 | ||
925 | /* Store the SSI-specific information that we need */ | |
3d5f615f GR |
926 | dma->ssi_stx_phys = res.start + CCSR_SSI_STX0; |
927 | dma->ssi_srx_phys = res.start + CCSR_SSI_SRX0; | |
f0fba2ad | 928 | |
8e9d8690 TT |
929 | iprop = of_get_property(ssi_np, "fsl,fifo-depth", NULL); |
930 | if (iprop) | |
147dfe90 | 931 | dma->ssi_fifo_depth = be32_to_cpup(iprop); |
8e9d8690 TT |
932 | else |
933 | /* Older 8610 DTs didn't have the fifo-depth property */ | |
934 | dma->ssi_fifo_depth = 8; | |
935 | ||
936 | of_node_put(ssi_np); | |
937 | ||
38fec727 | 938 | ret = snd_soc_register_platform(&pdev->dev, &dma->dai); |
f0fba2ad | 939 | if (ret) { |
38fec727 | 940 | dev_err(&pdev->dev, "could not register platform\n"); |
f0fba2ad LG |
941 | kfree(dma); |
942 | return ret; | |
943 | } | |
944 | ||
945 | dma->channel = of_iomap(np, 0); | |
946 | dma->irq = irq_of_parse_and_map(np, 0); | |
87a0632b | 947 | |
38fec727 | 948 | dev_set_drvdata(&pdev->dev, dma); |
f0fba2ad LG |
949 | |
950 | return 0; | |
951 | } | |
952 | ||
a0a3d518 | 953 | static int fsl_soc_dma_remove(struct platform_device *pdev) |
17467f23 | 954 | { |
38fec727 | 955 | struct dma_object *dma = dev_get_drvdata(&pdev->dev); |
17467f23 | 956 | |
38fec727 | 957 | snd_soc_unregister_platform(&pdev->dev); |
87a0632b TT |
958 | iounmap(dma->channel); |
959 | irq_dispose_mapping(dma->irq); | |
960 | kfree(dma); | |
17467f23 | 961 | |
f0fba2ad | 962 | return 0; |
17467f23 | 963 | } |
17467f23 | 964 | |
f0fba2ad LG |
965 | static const struct of_device_id fsl_soc_dma_ids[] = { |
966 | { .compatible = "fsl,ssi-dma-channel", }, | |
967 | {} | |
968 | }; | |
969 | MODULE_DEVICE_TABLE(of, fsl_soc_dma_ids); | |
970 | ||
f07eb223 | 971 | static struct platform_driver fsl_soc_dma_driver = { |
f0fba2ad LG |
972 | .driver = { |
973 | .name = "fsl-pcm-audio", | |
974 | .owner = THIS_MODULE, | |
975 | .of_match_table = fsl_soc_dma_ids, | |
976 | }, | |
977 | .probe = fsl_soc_dma_probe, | |
a0a3d518 | 978 | .remove = fsl_soc_dma_remove, |
f0fba2ad LG |
979 | }; |
980 | ||
ba0a7e02 | 981 | module_platform_driver(fsl_soc_dma_driver); |
958e792c | 982 | |
17467f23 | 983 | MODULE_AUTHOR("Timur Tabi <timur@freescale.com>"); |
f0fba2ad LG |
984 | MODULE_DESCRIPTION("Freescale Elo DMA ASoC PCM Driver"); |
985 | MODULE_LICENSE("GPL v2"); |