1 // SPDX-License-Identifier: GPL-2.0-only
3 // Freescale MPC5200 PSC DMA
4 // ALSA SoC Platform driver
6 // Copyright (C) 2008 Secret Lab Technologies Ltd.
7 // Copyright (C) 2009 Jon Smirl, Digispeaker
9 #include <linux/module.h>
10 #include <linux/of_device.h>
11 #include <linux/dma-mapping.h>
12 #include <linux/slab.h>
13 #include <linux/of_address.h>
14 #include <linux/of_irq.h>
15 #include <linux/of_platform.h>
17 #include <sound/soc.h>
19 #include <linux/fsl/bestcomm/bestcomm.h>
20 #include <linux/fsl/bestcomm/gen_bd.h>
21 #include <asm/mpc52xx_psc.h>
23 #include "mpc5200_dma.h"
25 #define DRV_NAME "mpc5200_dma"
30 static irqreturn_t psc_dma_status_irq(int irq, void *_psc_dma)
32 struct psc_dma *psc_dma = _psc_dma;
33 struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
36 isr = in_be16(®s->mpc52xx_psc_isr);
38 /* Playback underrun error */
39 if (psc_dma->playback.active && (isr & MPC52xx_PSC_IMR_TXEMP))
40 psc_dma->stats.underrun_count++;
42 /* Capture overrun error */
43 if (psc_dma->capture.active && (isr & MPC52xx_PSC_IMR_ORERR))
44 psc_dma->stats.overrun_count++;
46 out_8(®s->command, MPC52xx_PSC_RST_ERR_STAT);
52 * psc_dma_bcom_enqueue_next_buffer - Enqueue another audio buffer
53 * @s: pointer to stream private data structure
55 * Enqueues another audio period buffer into the bestcomm queue.
57 * Note: The routine must only be called when there is space available in
58 * the queue. Otherwise the enqueue will fail and the audio ring buffer
59 * will get out of sync
61 static void psc_dma_bcom_enqueue_next_buffer(struct psc_dma_stream *s)
65 /* Prepare and enqueue the next buffer descriptor */
66 bd = bcom_prepare_next_buffer(s->bcom_task);
67 bd->status = s->period_bytes;
68 bd->data[0] = s->runtime->dma_addr + (s->period_next * s->period_bytes);
69 bcom_submit_next_buffer(s->bcom_task, NULL);
71 /* Update for next period */
72 s->period_next = (s->period_next + 1) % s->runtime->periods;
75 /* Bestcomm DMA irq handler */
76 static irqreturn_t psc_dma_bcom_irq(int irq, void *_psc_dma_stream)
78 struct psc_dma_stream *s = _psc_dma_stream;
80 spin_lock(&s->psc_dma->lock);
81 /* For each finished period, dequeue the completed period buffer
82 * and enqueue a new one in it's place. */
83 while (bcom_buffer_done(s->bcom_task)) {
84 bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
86 s->period_current = (s->period_current+1) % s->runtime->periods;
89 psc_dma_bcom_enqueue_next_buffer(s);
91 spin_unlock(&s->psc_dma->lock);
93 /* If the stream is active, then also inform the PCM middle layer
94 * of the period finished event. */
96 snd_pcm_period_elapsed(s->stream);
101 static int psc_dma_hw_free(struct snd_pcm_substream *substream)
103 snd_pcm_set_runtime_buffer(substream, NULL);
108 * psc_dma_trigger: start and stop the DMA transfer.
110 * This function is called by ALSA to start, stop, pause, and resume the DMA
113 static int psc_dma_trigger(struct snd_pcm_substream *substream, int cmd)
115 struct snd_soc_pcm_runtime *rtd = substream->private_data;
116 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
117 struct snd_pcm_runtime *runtime = substream->runtime;
118 struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
119 struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
125 case SNDRV_PCM_TRIGGER_START:
126 dev_dbg(psc_dma->dev, "START: stream=%i fbits=%u ps=%u #p=%u\n",
127 substream->pstr->stream, runtime->frame_bits,
128 (int)runtime->period_size, runtime->periods);
129 s->period_bytes = frames_to_bytes(runtime,
130 runtime->period_size);
132 s->period_current = 0;
135 s->runtime = runtime;
137 /* Fill up the bestcomm bd queue and enable DMA.
138 * This will begin filling the PSC's fifo.
140 spin_lock_irqsave(&psc_dma->lock, flags);
142 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
143 bcom_gen_bd_rx_reset(s->bcom_task);
145 bcom_gen_bd_tx_reset(s->bcom_task);
147 for (i = 0; i < runtime->periods; i++)
148 if (!bcom_queue_full(s->bcom_task))
149 psc_dma_bcom_enqueue_next_buffer(s);
151 bcom_enable(s->bcom_task);
152 spin_unlock_irqrestore(&psc_dma->lock, flags);
154 out_8(®s->command, MPC52xx_PSC_RST_ERR_STAT);
158 case SNDRV_PCM_TRIGGER_STOP:
159 dev_dbg(psc_dma->dev, "STOP: stream=%i periods_count=%i\n",
160 substream->pstr->stream, s->period_count);
163 spin_lock_irqsave(&psc_dma->lock, flags);
164 bcom_disable(s->bcom_task);
165 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
166 bcom_gen_bd_rx_reset(s->bcom_task);
168 bcom_gen_bd_tx_reset(s->bcom_task);
169 spin_unlock_irqrestore(&psc_dma->lock, flags);
174 dev_dbg(psc_dma->dev, "unhandled trigger: stream=%i cmd=%i\n",
175 substream->pstr->stream, cmd);
179 /* Update interrupt enable settings */
181 if (psc_dma->playback.active)
182 imr |= MPC52xx_PSC_IMR_TXEMP;
183 if (psc_dma->capture.active)
184 imr |= MPC52xx_PSC_IMR_ORERR;
185 out_be16(®s->isr_imr.imr, psc_dma->imr | imr);
191 /* ---------------------------------------------------------------------
192 * The PSC DMA 'ASoC platform' driver
194 * Can be referenced by an 'ASoC machine' driver
195 * This driver only deals with the audio bus; it doesn't have any
196 * interaction with the attached codec
199 static const struct snd_pcm_hardware psc_dma_hardware = {
200 .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
201 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
202 SNDRV_PCM_INFO_BATCH,
203 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE |
204 SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE,
205 .period_bytes_max = 1024 * 1024,
206 .period_bytes_min = 32,
209 .buffer_bytes_max = 2 * 1024 * 1024,
213 static int psc_dma_open(struct snd_pcm_substream *substream)
215 struct snd_pcm_runtime *runtime = substream->runtime;
216 struct snd_soc_pcm_runtime *rtd = substream->private_data;
217 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
218 struct psc_dma_stream *s;
221 dev_dbg(psc_dma->dev, "psc_dma_open(substream=%p)\n", substream);
223 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
224 s = &psc_dma->capture;
226 s = &psc_dma->playback;
228 snd_soc_set_runtime_hwparams(substream, &psc_dma_hardware);
230 rc = snd_pcm_hw_constraint_integer(runtime,
231 SNDRV_PCM_HW_PARAM_PERIODS);
233 dev_err(substream->pcm->card->dev, "invalid buffer size\n");
237 s->stream = substream;
241 static int psc_dma_close(struct snd_pcm_substream *substream)
243 struct snd_soc_pcm_runtime *rtd = substream->private_data;
244 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
245 struct psc_dma_stream *s;
247 dev_dbg(psc_dma->dev, "psc_dma_close(substream=%p)\n", substream);
249 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
250 s = &psc_dma->capture;
252 s = &psc_dma->playback;
254 if (!psc_dma->playback.active &&
255 !psc_dma->capture.active) {
257 /* Disable all interrupts and reset the PSC */
258 out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
259 out_8(&psc_dma->psc_regs->command, 4 << 4); /* reset error */
265 static snd_pcm_uframes_t
266 psc_dma_pointer(struct snd_pcm_substream *substream)
268 struct snd_soc_pcm_runtime *rtd = substream->private_data;
269 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
270 struct psc_dma_stream *s;
273 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
274 s = &psc_dma->capture;
276 s = &psc_dma->playback;
278 count = s->period_current * s->period_bytes;
280 return bytes_to_frames(substream->runtime, count);
284 psc_dma_hw_params(struct snd_pcm_substream *substream,
285 struct snd_pcm_hw_params *params)
287 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
292 static const struct snd_pcm_ops psc_dma_ops = {
293 .open = psc_dma_open,
294 .close = psc_dma_close,
295 .hw_free = psc_dma_hw_free,
296 .ioctl = snd_pcm_lib_ioctl,
297 .pointer = psc_dma_pointer,
298 .trigger = psc_dma_trigger,
299 .hw_params = psc_dma_hw_params,
302 static int psc_dma_new(struct snd_soc_pcm_runtime *rtd)
304 struct snd_card *card = rtd->card->snd_card;
305 struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
306 struct snd_soc_dai *dai = rtd->cpu_dai;
307 struct snd_pcm *pcm = rtd->pcm;
308 size_t size = psc_dma_hardware.buffer_bytes_max;
311 dev_dbg(component->dev, "psc_dma_new(card=%p, dai=%p, pcm=%p)\n",
314 rc = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
318 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
319 rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
320 size, &pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->dma_buffer);
322 goto playback_alloc_err;
325 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
326 rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
327 size, &pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->dma_buffer);
329 goto capture_alloc_err;
335 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
336 snd_dma_free_pages(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->dma_buffer);
339 dev_err(card->dev, "Cannot allocate buffer(s)\n");
344 static void psc_dma_free(struct snd_pcm *pcm)
346 struct snd_soc_pcm_runtime *rtd = pcm->private_data;
347 struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
348 struct snd_pcm_substream *substream;
351 dev_dbg(component->dev, "psc_dma_free(pcm=%p)\n", pcm);
353 for (stream = 0; stream < 2; stream++) {
354 substream = pcm->streams[stream].substream;
356 snd_dma_free_pages(&substream->dma_buffer);
357 substream->dma_buffer.area = NULL;
358 substream->dma_buffer.addr = 0;
363 static const struct snd_soc_component_driver mpc5200_audio_dma_component = {
366 .pcm_new = &psc_dma_new,
367 .pcm_free = &psc_dma_free,
370 int mpc5200_audio_dma_create(struct platform_device *op)
373 struct psc_dma *psc_dma;
380 /* Fetch the registers and IRQ of the PSC */
381 irq = irq_of_parse_and_map(op->dev.of_node, 0);
382 if (of_address_to_resource(op->dev.of_node, 0, &res)) {
383 dev_err(&op->dev, "Missing reg property\n");
386 regs = ioremap(res.start, resource_size(&res));
388 dev_err(&op->dev, "Could not map registers\n");
392 /* Allocate and initialize the driver private data */
393 psc_dma = kzalloc(sizeof *psc_dma, GFP_KERNEL);
400 prop = of_get_property(op->dev.of_node, "cell-index", &size);
401 if (!prop || size < sizeof *prop) {
406 spin_lock_init(&psc_dma->lock);
407 mutex_init(&psc_dma->mutex);
408 psc_dma->id = be32_to_cpu(*prop);
410 psc_dma->psc_regs = regs;
411 psc_dma->fifo_regs = regs + sizeof *psc_dma->psc_regs;
412 psc_dma->dev = &op->dev;
413 psc_dma->playback.psc_dma = psc_dma;
414 psc_dma->capture.psc_dma = psc_dma;
415 snprintf(psc_dma->name, sizeof psc_dma->name, "PSC%u", psc_dma->id);
417 /* Find the address of the fifo data registers and setup the
419 fifo = res.start + offsetof(struct mpc52xx_psc, buffer.buffer_32);
420 psc_dma->capture.bcom_task =
421 bcom_psc_gen_bd_rx_init(psc_dma->id, 10, fifo, 512);
422 psc_dma->playback.bcom_task =
423 bcom_psc_gen_bd_tx_init(psc_dma->id, 10, fifo);
424 if (!psc_dma->capture.bcom_task ||
425 !psc_dma->playback.bcom_task) {
426 dev_err(&op->dev, "Could not allocate bestcomm tasks\n");
431 /* Disable all interrupts and reset the PSC */
432 out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
434 out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_RX);
435 /* reset transmitter */
436 out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_TX);
438 out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_ERR_STAT);
440 out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_SEL_MODE_REG_1);
442 /* Set up mode register;
443 * First write: RxRdy (FIFO Alarm) generates rx FIFO irq
444 * Second write: register Normal mode for non loopback
446 out_8(&psc_dma->psc_regs->mode, 0);
447 out_8(&psc_dma->psc_regs->mode, 0);
449 /* Set the TX and RX fifo alarm thresholds */
450 out_be16(&psc_dma->fifo_regs->rfalarm, 0x100);
451 out_8(&psc_dma->fifo_regs->rfcntl, 0x4);
452 out_be16(&psc_dma->fifo_regs->tfalarm, 0x100);
453 out_8(&psc_dma->fifo_regs->tfcntl, 0x7);
455 /* Lookup the IRQ numbers */
456 psc_dma->playback.irq =
457 bcom_get_task_irq(psc_dma->playback.bcom_task);
458 psc_dma->capture.irq =
459 bcom_get_task_irq(psc_dma->capture.bcom_task);
461 rc = request_irq(psc_dma->irq, &psc_dma_status_irq, IRQF_SHARED,
462 "psc-dma-status", psc_dma);
463 rc |= request_irq(psc_dma->capture.irq, &psc_dma_bcom_irq, IRQF_SHARED,
464 "psc-dma-capture", &psc_dma->capture);
465 rc |= request_irq(psc_dma->playback.irq, &psc_dma_bcom_irq, IRQF_SHARED,
466 "psc-dma-playback", &psc_dma->playback);
472 /* Save what we've done so it can be found again later */
473 dev_set_drvdata(&op->dev, psc_dma);
475 /* Tell the ASoC OF helpers about it */
476 return devm_snd_soc_register_component(&op->dev,
477 &mpc5200_audio_dma_component, NULL, 0);
479 free_irq(psc_dma->irq, psc_dma);
480 free_irq(psc_dma->capture.irq, &psc_dma->capture);
481 free_irq(psc_dma->playback.irq, &psc_dma->playback);
488 EXPORT_SYMBOL_GPL(mpc5200_audio_dma_create);
490 int mpc5200_audio_dma_destroy(struct platform_device *op)
492 struct psc_dma *psc_dma = dev_get_drvdata(&op->dev);
494 dev_dbg(&op->dev, "mpc5200_audio_dma_destroy()\n");
496 bcom_gen_bd_rx_release(psc_dma->capture.bcom_task);
497 bcom_gen_bd_tx_release(psc_dma->playback.bcom_task);
500 free_irq(psc_dma->irq, psc_dma);
501 free_irq(psc_dma->capture.irq, &psc_dma->capture);
502 free_irq(psc_dma->playback.irq, &psc_dma->playback);
504 iounmap(psc_dma->psc_regs);
506 dev_set_drvdata(&op->dev, NULL);
510 EXPORT_SYMBOL_GPL(mpc5200_audio_dma_destroy);
512 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
513 MODULE_DESCRIPTION("Freescale MPC5200 PSC in DMA mode ASoC Driver");
514 MODULE_LICENSE("GPL");