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352 lines
9.1 KiB
352 lines
9.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Au12x0/Au1550 PSC ALSA ASoC audio support. |
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* |
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* (c) 2007-2008 MSC Vertriebsges.m.b.H., |
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* Manuel Lauss <[email protected]> |
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* |
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* DMA glue for Au1x-PSC audio. |
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*/ |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/platform_device.h> |
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#include <linux/slab.h> |
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#include <linux/dma-mapping.h> |
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#include <sound/core.h> |
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#include <sound/pcm.h> |
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#include <sound/pcm_params.h> |
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#include <sound/soc.h> |
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#include <asm/mach-au1x00/au1000.h> |
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#include <asm/mach-au1x00/au1xxx_dbdma.h> |
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#include <asm/mach-au1x00/au1xxx_psc.h> |
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#include "psc.h" |
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/*#define PCM_DEBUG*/ |
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#define DRV_NAME "dbdma2" |
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#define MSG(x...) printk(KERN_INFO "au1xpsc_pcm: " x) |
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#ifdef PCM_DEBUG |
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#define DBG MSG |
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#else |
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#define DBG(x...) do {} while (0) |
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#endif |
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struct au1xpsc_audio_dmadata { |
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/* DDMA control data */ |
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unsigned int ddma_id; /* DDMA direction ID for this PSC */ |
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u32 ddma_chan; /* DDMA context */ |
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/* PCM context (for irq handlers) */ |
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struct snd_pcm_substream *substream; |
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unsigned long curr_period; /* current segment DDMA is working on */ |
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unsigned long q_period; /* queue period(s) */ |
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dma_addr_t dma_area; /* address of queued DMA area */ |
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dma_addr_t dma_area_s; /* start address of DMA area */ |
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unsigned long pos; /* current byte position being played */ |
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unsigned long periods; /* number of SG segments in total */ |
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unsigned long period_bytes; /* size in bytes of one SG segment */ |
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/* runtime data */ |
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int msbits; |
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}; |
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/* |
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* These settings are somewhat okay, at least on my machine audio plays |
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* almost skip-free. Especially the 64kB buffer seems to help a LOT. |
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*/ |
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#define AU1XPSC_PERIOD_MIN_BYTES 1024 |
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#define AU1XPSC_BUFFER_MIN_BYTES 65536 |
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/* PCM hardware DMA capabilities - platform specific */ |
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static const struct snd_pcm_hardware au1xpsc_pcm_hardware = { |
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.info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | |
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SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BATCH, |
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.period_bytes_min = AU1XPSC_PERIOD_MIN_BYTES, |
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.period_bytes_max = 4096 * 1024 - 1, |
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.periods_min = 2, |
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.periods_max = 4096, /* 2 to as-much-as-you-like */ |
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.buffer_bytes_max = 4096 * 1024 - 1, |
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.fifo_size = 16, /* fifo entries of AC97/I2S PSC */ |
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}; |
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static void au1x_pcm_queue_tx(struct au1xpsc_audio_dmadata *cd) |
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{ |
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au1xxx_dbdma_put_source(cd->ddma_chan, cd->dma_area, |
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cd->period_bytes, DDMA_FLAGS_IE); |
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/* update next-to-queue period */ |
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++cd->q_period; |
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cd->dma_area += cd->period_bytes; |
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if (cd->q_period >= cd->periods) { |
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cd->q_period = 0; |
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cd->dma_area = cd->dma_area_s; |
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} |
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} |
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static void au1x_pcm_queue_rx(struct au1xpsc_audio_dmadata *cd) |
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{ |
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au1xxx_dbdma_put_dest(cd->ddma_chan, cd->dma_area, |
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cd->period_bytes, DDMA_FLAGS_IE); |
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/* update next-to-queue period */ |
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++cd->q_period; |
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cd->dma_area += cd->period_bytes; |
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if (cd->q_period >= cd->periods) { |
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cd->q_period = 0; |
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cd->dma_area = cd->dma_area_s; |
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} |
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} |
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static void au1x_pcm_dmatx_cb(int irq, void *dev_id) |
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{ |
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struct au1xpsc_audio_dmadata *cd = dev_id; |
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cd->pos += cd->period_bytes; |
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if (++cd->curr_period >= cd->periods) { |
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cd->pos = 0; |
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cd->curr_period = 0; |
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} |
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snd_pcm_period_elapsed(cd->substream); |
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au1x_pcm_queue_tx(cd); |
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} |
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static void au1x_pcm_dmarx_cb(int irq, void *dev_id) |
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{ |
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struct au1xpsc_audio_dmadata *cd = dev_id; |
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cd->pos += cd->period_bytes; |
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if (++cd->curr_period >= cd->periods) { |
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cd->pos = 0; |
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cd->curr_period = 0; |
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} |
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snd_pcm_period_elapsed(cd->substream); |
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au1x_pcm_queue_rx(cd); |
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} |
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static void au1x_pcm_dbdma_free(struct au1xpsc_audio_dmadata *pcd) |
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{ |
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if (pcd->ddma_chan) { |
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au1xxx_dbdma_stop(pcd->ddma_chan); |
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au1xxx_dbdma_reset(pcd->ddma_chan); |
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au1xxx_dbdma_chan_free(pcd->ddma_chan); |
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pcd->ddma_chan = 0; |
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pcd->msbits = 0; |
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} |
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} |
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/* in case of missing DMA ring or changed TX-source / RX-dest bit widths, |
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* allocate (or reallocate) a 2-descriptor DMA ring with bit depth according |
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* to ALSA-supplied sample depth. This is due to limitations in the dbdma api |
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* (cannot adjust source/dest widths of already allocated descriptor ring). |
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*/ |
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static int au1x_pcm_dbdma_realloc(struct au1xpsc_audio_dmadata *pcd, |
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int stype, int msbits) |
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{ |
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/* DMA only in 8/16/32 bit widths */ |
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if (msbits == 24) |
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msbits = 32; |
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/* check current config: correct bits and descriptors allocated? */ |
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if ((pcd->ddma_chan) && (msbits == pcd->msbits)) |
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goto out; /* all ok! */ |
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au1x_pcm_dbdma_free(pcd); |
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if (stype == SNDRV_PCM_STREAM_CAPTURE) |
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pcd->ddma_chan = au1xxx_dbdma_chan_alloc(pcd->ddma_id, |
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DSCR_CMD0_ALWAYS, |
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au1x_pcm_dmarx_cb, (void *)pcd); |
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else |
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pcd->ddma_chan = au1xxx_dbdma_chan_alloc(DSCR_CMD0_ALWAYS, |
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pcd->ddma_id, |
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au1x_pcm_dmatx_cb, (void *)pcd); |
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if (!pcd->ddma_chan) |
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return -ENOMEM; |
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au1xxx_dbdma_set_devwidth(pcd->ddma_chan, msbits); |
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au1xxx_dbdma_ring_alloc(pcd->ddma_chan, 2); |
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pcd->msbits = msbits; |
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au1xxx_dbdma_stop(pcd->ddma_chan); |
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au1xxx_dbdma_reset(pcd->ddma_chan); |
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out: |
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return 0; |
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} |
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static inline struct au1xpsc_audio_dmadata *to_dmadata(struct snd_pcm_substream *ss, |
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struct snd_soc_component *component) |
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{ |
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struct au1xpsc_audio_dmadata *pcd = snd_soc_component_get_drvdata(component); |
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return &pcd[ss->stream]; |
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} |
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static int au1xpsc_pcm_hw_params(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream, |
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struct snd_pcm_hw_params *params) |
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{ |
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struct snd_pcm_runtime *runtime = substream->runtime; |
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struct au1xpsc_audio_dmadata *pcd; |
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int stype, ret; |
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stype = substream->stream; |
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pcd = to_dmadata(substream, component); |
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DBG("runtime->dma_area = 0x%08lx dma_addr_t = 0x%08lx dma_size = %zu " |
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"runtime->min_align %lu\n", |
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(unsigned long)runtime->dma_area, |
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(unsigned long)runtime->dma_addr, runtime->dma_bytes, |
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runtime->min_align); |
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DBG("bits %d frags %d frag_bytes %d is_rx %d\n", params->msbits, |
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params_periods(params), params_period_bytes(params), stype); |
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ret = au1x_pcm_dbdma_realloc(pcd, stype, params->msbits); |
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if (ret) { |
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MSG("DDMA channel (re)alloc failed!\n"); |
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goto out; |
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} |
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pcd->substream = substream; |
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pcd->period_bytes = params_period_bytes(params); |
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pcd->periods = params_periods(params); |
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pcd->dma_area_s = pcd->dma_area = runtime->dma_addr; |
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pcd->q_period = 0; |
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pcd->curr_period = 0; |
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pcd->pos = 0; |
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ret = 0; |
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out: |
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return ret; |
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} |
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static int au1xpsc_pcm_prepare(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream) |
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{ |
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struct au1xpsc_audio_dmadata *pcd = to_dmadata(substream, component); |
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au1xxx_dbdma_reset(pcd->ddma_chan); |
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if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { |
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au1x_pcm_queue_rx(pcd); |
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au1x_pcm_queue_rx(pcd); |
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} else { |
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au1x_pcm_queue_tx(pcd); |
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au1x_pcm_queue_tx(pcd); |
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} |
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return 0; |
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} |
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static int au1xpsc_pcm_trigger(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream, int cmd) |
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{ |
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u32 c = to_dmadata(substream, component)->ddma_chan; |
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switch (cmd) { |
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case SNDRV_PCM_TRIGGER_START: |
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case SNDRV_PCM_TRIGGER_RESUME: |
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au1xxx_dbdma_start(c); |
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break; |
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case SNDRV_PCM_TRIGGER_STOP: |
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case SNDRV_PCM_TRIGGER_SUSPEND: |
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au1xxx_dbdma_stop(c); |
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break; |
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default: |
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return -EINVAL; |
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} |
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return 0; |
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} |
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static snd_pcm_uframes_t |
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au1xpsc_pcm_pointer(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream) |
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{ |
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return bytes_to_frames(substream->runtime, |
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to_dmadata(substream, component)->pos); |
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} |
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static int au1xpsc_pcm_open(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream) |
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{ |
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struct au1xpsc_audio_dmadata *pcd = to_dmadata(substream, component); |
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); |
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int stype = substream->stream, *dmaids; |
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dmaids = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream); |
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if (!dmaids) |
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return -ENODEV; /* whoa, has ordering changed? */ |
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pcd->ddma_id = dmaids[stype]; |
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snd_soc_set_runtime_hwparams(substream, &au1xpsc_pcm_hardware); |
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return 0; |
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} |
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static int au1xpsc_pcm_close(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream) |
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{ |
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au1x_pcm_dbdma_free(to_dmadata(substream, component)); |
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return 0; |
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} |
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static int au1xpsc_pcm_new(struct snd_soc_component *component, |
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struct snd_soc_pcm_runtime *rtd) |
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{ |
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struct snd_card *card = rtd->card->snd_card; |
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struct snd_pcm *pcm = rtd->pcm; |
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snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV, |
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card->dev, AU1XPSC_BUFFER_MIN_BYTES, (4096 * 1024) - 1); |
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return 0; |
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} |
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/* au1xpsc audio platform */ |
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static struct snd_soc_component_driver au1xpsc_soc_component = { |
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.name = DRV_NAME, |
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.open = au1xpsc_pcm_open, |
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.close = au1xpsc_pcm_close, |
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.hw_params = au1xpsc_pcm_hw_params, |
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.prepare = au1xpsc_pcm_prepare, |
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.trigger = au1xpsc_pcm_trigger, |
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.pointer = au1xpsc_pcm_pointer, |
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.pcm_construct = au1xpsc_pcm_new, |
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}; |
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static int au1xpsc_pcm_drvprobe(struct platform_device *pdev) |
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{ |
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struct au1xpsc_audio_dmadata *dmadata; |
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dmadata = devm_kcalloc(&pdev->dev, |
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2, sizeof(struct au1xpsc_audio_dmadata), |
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GFP_KERNEL); |
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if (!dmadata) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, dmadata); |
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return devm_snd_soc_register_component(&pdev->dev, |
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&au1xpsc_soc_component, NULL, 0); |
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} |
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static struct platform_driver au1xpsc_pcm_driver = { |
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.driver = { |
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.name = "au1xpsc-pcm", |
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}, |
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.probe = au1xpsc_pcm_drvprobe, |
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}; |
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module_platform_driver(au1xpsc_pcm_driver); |
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MODULE_LICENSE("GPL"); |
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MODULE_DESCRIPTION("Au12x0/Au1550 PSC Audio DMA driver"); |
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MODULE_AUTHOR("Manuel Lauss");
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