2 * Au12x0/Au1550 PSC ALSA ASoC audio support.
4 * (c) 2007-2008 MSC Vertriebsges.m.b.H.,
5 * Manuel Lauss <manuel.lauss@gmail.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * DMA glue for Au1x-PSC audio.
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/platform_device.h>
19 #include <linux/slab.h>
20 #include <linux/dma-mapping.h>
22 #include <sound/core.h>
23 #include <sound/pcm.h>
24 #include <sound/pcm_params.h>
25 #include <sound/soc.h>
27 #include <asm/mach-au1x00/au1000.h>
28 #include <asm/mach-au1x00/au1xxx_dbdma.h>
29 #include <asm/mach-au1x00/au1xxx_psc.h>
35 #define DRV_NAME "dbdma2"
37 #define MSG(x...) printk(KERN_INFO "au1xpsc_pcm: " x)
41 #define DBG(x...) do {} while (0)
44 struct au1xpsc_audio_dmadata {
45 /* DDMA control data */
46 unsigned int ddma_id; /* DDMA direction ID for this PSC */
47 u32 ddma_chan; /* DDMA context */
49 /* PCM context (for irq handlers) */
50 struct snd_pcm_substream *substream;
51 unsigned long curr_period; /* current segment DDMA is working on */
52 unsigned long q_period; /* queue period(s) */
53 dma_addr_t dma_area; /* address of queued DMA area */
54 dma_addr_t dma_area_s; /* start address of DMA area */
55 unsigned long pos; /* current byte position being played */
56 unsigned long periods; /* number of SG segments in total */
57 unsigned long period_bytes; /* size in bytes of one SG segment */
64 * These settings are somewhat okay, at least on my machine audio plays
65 * almost skip-free. Especially the 64kB buffer seems to help a LOT.
67 #define AU1XPSC_PERIOD_MIN_BYTES 1024
68 #define AU1XPSC_BUFFER_MIN_BYTES 65536
70 /* PCM hardware DMA capabilities - platform specific */
71 static const struct snd_pcm_hardware au1xpsc_pcm_hardware = {
72 .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
73 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BATCH,
74 .period_bytes_min = AU1XPSC_PERIOD_MIN_BYTES,
75 .period_bytes_max = 4096 * 1024 - 1,
77 .periods_max = 4096, /* 2 to as-much-as-you-like */
78 .buffer_bytes_max = 4096 * 1024 - 1,
79 .fifo_size = 16, /* fifo entries of AC97/I2S PSC */
82 static void au1x_pcm_queue_tx(struct au1xpsc_audio_dmadata *cd)
84 au1xxx_dbdma_put_source(cd->ddma_chan, cd->dma_area,
85 cd->period_bytes, DDMA_FLAGS_IE);
87 /* update next-to-queue period */
89 cd->dma_area += cd->period_bytes;
90 if (cd->q_period >= cd->periods) {
92 cd->dma_area = cd->dma_area_s;
96 static void au1x_pcm_queue_rx(struct au1xpsc_audio_dmadata *cd)
98 au1xxx_dbdma_put_dest(cd->ddma_chan, cd->dma_area,
99 cd->period_bytes, DDMA_FLAGS_IE);
101 /* update next-to-queue period */
103 cd->dma_area += cd->period_bytes;
104 if (cd->q_period >= cd->periods) {
106 cd->dma_area = cd->dma_area_s;
110 static void au1x_pcm_dmatx_cb(int irq, void *dev_id)
112 struct au1xpsc_audio_dmadata *cd = dev_id;
114 cd->pos += cd->period_bytes;
115 if (++cd->curr_period >= cd->periods) {
119 snd_pcm_period_elapsed(cd->substream);
120 au1x_pcm_queue_tx(cd);
123 static void au1x_pcm_dmarx_cb(int irq, void *dev_id)
125 struct au1xpsc_audio_dmadata *cd = dev_id;
127 cd->pos += cd->period_bytes;
128 if (++cd->curr_period >= cd->periods) {
132 snd_pcm_period_elapsed(cd->substream);
133 au1x_pcm_queue_rx(cd);
136 static void au1x_pcm_dbdma_free(struct au1xpsc_audio_dmadata *pcd)
138 if (pcd->ddma_chan) {
139 au1xxx_dbdma_stop(pcd->ddma_chan);
140 au1xxx_dbdma_reset(pcd->ddma_chan);
141 au1xxx_dbdma_chan_free(pcd->ddma_chan);
147 /* in case of missing DMA ring or changed TX-source / RX-dest bit widths,
148 * allocate (or reallocate) a 2-descriptor DMA ring with bit depth according
149 * to ALSA-supplied sample depth. This is due to limitations in the dbdma api
150 * (cannot adjust source/dest widths of already allocated descriptor ring).
152 static int au1x_pcm_dbdma_realloc(struct au1xpsc_audio_dmadata *pcd,
153 int stype, int msbits)
155 /* DMA only in 8/16/32 bit widths */
159 /* check current config: correct bits and descriptors allocated? */
160 if ((pcd->ddma_chan) && (msbits == pcd->msbits))
161 goto out; /* all ok! */
163 au1x_pcm_dbdma_free(pcd);
165 if (stype == SNDRV_PCM_STREAM_CAPTURE)
166 pcd->ddma_chan = au1xxx_dbdma_chan_alloc(pcd->ddma_id,
168 au1x_pcm_dmarx_cb, (void *)pcd);
170 pcd->ddma_chan = au1xxx_dbdma_chan_alloc(DSCR_CMD0_ALWAYS,
172 au1x_pcm_dmatx_cb, (void *)pcd);
177 au1xxx_dbdma_set_devwidth(pcd->ddma_chan, msbits);
178 au1xxx_dbdma_ring_alloc(pcd->ddma_chan, 2);
180 pcd->msbits = msbits;
182 au1xxx_dbdma_stop(pcd->ddma_chan);
183 au1xxx_dbdma_reset(pcd->ddma_chan);
189 static inline struct au1xpsc_audio_dmadata *to_dmadata(struct snd_pcm_substream *ss)
191 struct snd_soc_pcm_runtime *rtd = ss->private_data;
192 struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
193 struct au1xpsc_audio_dmadata *pcd = snd_soc_component_get_drvdata(component);
194 return &pcd[ss->stream];
197 static int au1xpsc_pcm_hw_params(struct snd_pcm_substream *substream,
198 struct snd_pcm_hw_params *params)
200 struct snd_pcm_runtime *runtime = substream->runtime;
201 struct au1xpsc_audio_dmadata *pcd;
204 ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
208 stype = substream->stream;
209 pcd = to_dmadata(substream);
211 DBG("runtime->dma_area = 0x%08lx dma_addr_t = 0x%08lx dma_size = %zu "
212 "runtime->min_align %lu\n",
213 (unsigned long)runtime->dma_area,
214 (unsigned long)runtime->dma_addr, runtime->dma_bytes,
217 DBG("bits %d frags %d frag_bytes %d is_rx %d\n", params->msbits,
218 params_periods(params), params_period_bytes(params), stype);
220 ret = au1x_pcm_dbdma_realloc(pcd, stype, params->msbits);
222 MSG("DDMA channel (re)alloc failed!\n");
226 pcd->substream = substream;
227 pcd->period_bytes = params_period_bytes(params);
228 pcd->periods = params_periods(params);
229 pcd->dma_area_s = pcd->dma_area = runtime->dma_addr;
231 pcd->curr_period = 0;
239 static int au1xpsc_pcm_hw_free(struct snd_pcm_substream *substream)
241 snd_pcm_lib_free_pages(substream);
245 static int au1xpsc_pcm_prepare(struct snd_pcm_substream *substream)
247 struct au1xpsc_audio_dmadata *pcd = to_dmadata(substream);
249 au1xxx_dbdma_reset(pcd->ddma_chan);
251 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
252 au1x_pcm_queue_rx(pcd);
253 au1x_pcm_queue_rx(pcd);
255 au1x_pcm_queue_tx(pcd);
256 au1x_pcm_queue_tx(pcd);
262 static int au1xpsc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
264 u32 c = to_dmadata(substream)->ddma_chan;
267 case SNDRV_PCM_TRIGGER_START:
268 case SNDRV_PCM_TRIGGER_RESUME:
269 au1xxx_dbdma_start(c);
271 case SNDRV_PCM_TRIGGER_STOP:
272 case SNDRV_PCM_TRIGGER_SUSPEND:
273 au1xxx_dbdma_stop(c);
281 static snd_pcm_uframes_t
282 au1xpsc_pcm_pointer(struct snd_pcm_substream *substream)
284 return bytes_to_frames(substream->runtime, to_dmadata(substream)->pos);
287 static int au1xpsc_pcm_open(struct snd_pcm_substream *substream)
289 struct au1xpsc_audio_dmadata *pcd = to_dmadata(substream);
290 struct snd_soc_pcm_runtime *rtd = substream->private_data;
291 int stype = substream->stream, *dmaids;
293 dmaids = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
295 return -ENODEV; /* whoa, has ordering changed? */
297 pcd->ddma_id = dmaids[stype];
299 snd_soc_set_runtime_hwparams(substream, &au1xpsc_pcm_hardware);
303 static int au1xpsc_pcm_close(struct snd_pcm_substream *substream)
305 au1x_pcm_dbdma_free(to_dmadata(substream));
309 static const struct snd_pcm_ops au1xpsc_pcm_ops = {
310 .open = au1xpsc_pcm_open,
311 .close = au1xpsc_pcm_close,
312 .ioctl = snd_pcm_lib_ioctl,
313 .hw_params = au1xpsc_pcm_hw_params,
314 .hw_free = au1xpsc_pcm_hw_free,
315 .prepare = au1xpsc_pcm_prepare,
316 .trigger = au1xpsc_pcm_trigger,
317 .pointer = au1xpsc_pcm_pointer,
320 static int au1xpsc_pcm_new(struct snd_soc_pcm_runtime *rtd)
322 struct snd_card *card = rtd->card->snd_card;
323 struct snd_pcm *pcm = rtd->pcm;
325 snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
326 card->dev, AU1XPSC_BUFFER_MIN_BYTES, (4096 * 1024) - 1);
331 /* au1xpsc audio platform */
332 static struct snd_soc_component_driver au1xpsc_soc_component = {
334 .ops = &au1xpsc_pcm_ops,
335 .pcm_new = au1xpsc_pcm_new,
338 static int au1xpsc_pcm_drvprobe(struct platform_device *pdev)
340 struct au1xpsc_audio_dmadata *dmadata;
342 dmadata = devm_kcalloc(&pdev->dev,
343 2, sizeof(struct au1xpsc_audio_dmadata),
348 platform_set_drvdata(pdev, dmadata);
350 return devm_snd_soc_register_component(&pdev->dev,
351 &au1xpsc_soc_component, NULL, 0);
354 static struct platform_driver au1xpsc_pcm_driver = {
356 .name = "au1xpsc-pcm",
358 .probe = au1xpsc_pcm_drvprobe,
361 module_platform_driver(au1xpsc_pcm_driver);
363 MODULE_LICENSE("GPL");
364 MODULE_DESCRIPTION("Au12x0/Au1550 PSC Audio DMA driver");
365 MODULE_AUTHOR("Manuel Lauss");