/* * Au12x0/Au1550 PSC ALSA ASoC audio support. * * (c) 2007-2008 MSC Vertriebsges.m.b.H., * Manuel Lauss <mano@roarinelk.homelinux.net> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * DMA glue for Au1x-PSC audio. * * NOTE: all of these drivers can only work with a SINGLE instance * of a PSC. Multiple independent audio devices are impossible * with ASoC v1. */ #include <linux/module.h> #include <linux/init.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/dma-mapping.h> #include <sound/core.h> #include <sound/pcm.h> #include <sound/pcm_params.h> #include <sound/soc.h> #include <asm/mach-au1x00/au1000.h> #include <asm/mach-au1x00/au1xxx_dbdma.h> #include <asm/mach-au1x00/au1xxx_psc.h> #include "psc.h" /*#define PCM_DEBUG*/ #define MSG(x...) printk(KERN_INFO "au1xpsc_pcm: " x) #ifdef PCM_DEBUG #define DBG MSG #else #define DBG(x...) do {} while (0) #endif struct au1xpsc_audio_dmadata { /* DDMA control data */ unsigned int ddma_id; /* DDMA direction ID for this PSC */ u32 ddma_chan; /* DDMA context */ /* PCM context (for irq handlers) */ struct snd_pcm_substream *substream; unsigned long curr_period; /* current segment DDMA is working on */ unsigned long q_period; /* queue period(s) */ unsigned long dma_area; /* address of queued DMA area */ unsigned long dma_area_s; /* start address of DMA area */ unsigned long pos; /* current byte position being played */ unsigned long periods; /* number of SG segments in total */ unsigned long period_bytes; /* size in bytes of one SG segment */ /* runtime data */ int msbits; }; /* instance data. There can be only one, MacLeod!!!! */ static struct au1xpsc_audio_dmadata *au1xpsc_audio_pcmdma[2]; /* * These settings are somewhat okay, at least on my machine audio plays * almost skip-free. Especially the 64kB buffer seems to help a LOT. */ #define AU1XPSC_PERIOD_MIN_BYTES 1024 #define AU1XPSC_BUFFER_MIN_BYTES 65536 #define AU1XPSC_PCM_FMTS \ (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 | \ SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | \ SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_U16_BE | \ SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE | \ SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_U32_BE | \ 0) /* PCM hardware DMA capabilities - platform specific */ static const struct snd_pcm_hardware au1xpsc_pcm_hardware = { .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BATCH, .formats = AU1XPSC_PCM_FMTS, .period_bytes_min = AU1XPSC_PERIOD_MIN_BYTES, .period_bytes_max = 4096 * 1024 - 1, .periods_min = 2, .periods_max = 4096, /* 2 to as-much-as-you-like */ .buffer_bytes_max = 4096 * 1024 - 1, .fifo_size = 16, /* fifo entries of AC97/I2S PSC */ }; static void au1x_pcm_queue_tx(struct au1xpsc_audio_dmadata *cd) { au1xxx_dbdma_put_source_flags(cd->ddma_chan, (void *)phys_to_virt(cd->dma_area), cd->period_bytes, DDMA_FLAGS_IE); /* update next-to-queue period */ ++cd->q_period; cd->dma_area += cd->period_bytes; if (cd->q_period >= cd->periods) { cd->q_period = 0; cd->dma_area = cd->dma_area_s; } } static void au1x_pcm_queue_rx(struct au1xpsc_audio_dmadata *cd) { au1xxx_dbdma_put_dest_flags(cd->ddma_chan, (void *)phys_to_virt(cd->dma_area), cd->period_bytes, DDMA_FLAGS_IE); /* update next-to-queue period */ ++cd->q_period; cd->dma_area += cd->period_bytes; if (cd->q_period >= cd->periods) { cd->q_period = 0; cd->dma_area = cd->dma_area_s; } } static void au1x_pcm_dmatx_cb(int irq, void *dev_id) { struct au1xpsc_audio_dmadata *cd = dev_id; cd->pos += cd->period_bytes; if (++cd->curr_period >= cd->periods) { cd->pos = 0; cd->curr_period = 0; } snd_pcm_period_elapsed(cd->substream); au1x_pcm_queue_tx(cd); } static void au1x_pcm_dmarx_cb(int irq, void *dev_id) { struct au1xpsc_audio_dmadata *cd = dev_id; cd->pos += cd->period_bytes; if (++cd->curr_period >= cd->periods) { cd->pos = 0; cd->curr_period = 0; } snd_pcm_period_elapsed(cd->substream); au1x_pcm_queue_rx(cd); } static void au1x_pcm_dbdma_free(struct au1xpsc_audio_dmadata *pcd) { if (pcd->ddma_chan) { au1xxx_dbdma_stop(pcd->ddma_chan); au1xxx_dbdma_reset(pcd->ddma_chan); au1xxx_dbdma_chan_free(pcd->ddma_chan); pcd->ddma_chan = 0; pcd->msbits = 0; } } /* in case of missing DMA ring or changed TX-source / RX-dest bit widths, * allocate (or reallocate) a 2-descriptor DMA ring with bit depth according * to ALSA-supplied sample depth. This is due to limitations in the dbdma api * (cannot adjust source/dest widths of already allocated descriptor ring). */ static int au1x_pcm_dbdma_realloc(struct au1xpsc_audio_dmadata *pcd, int stype, int msbits) { /* DMA only in 8/16/32 bit widths */ if (msbits == 24) msbits = 32; /* check current config: correct bits and descriptors allocated? */ if ((pcd->ddma_chan) && (msbits == pcd->msbits)) goto out; /* all ok! */ au1x_pcm_dbdma_free(pcd); if (stype == PCM_RX) pcd->ddma_chan = au1xxx_dbdma_chan_alloc(pcd->ddma_id, DSCR_CMD0_ALWAYS, au1x_pcm_dmarx_cb, (void *)pcd); else pcd->ddma_chan = au1xxx_dbdma_chan_alloc(DSCR_CMD0_ALWAYS, pcd->ddma_id, au1x_pcm_dmatx_cb, (void *)pcd); if (!pcd->ddma_chan) return -ENOMEM; au1xxx_dbdma_set_devwidth(pcd->ddma_chan, msbits); au1xxx_dbdma_ring_alloc(pcd->ddma_chan, 2); pcd->msbits = msbits; au1xxx_dbdma_stop(pcd->ddma_chan); au1xxx_dbdma_reset(pcd->ddma_chan); out: return 0; } static int au1xpsc_pcm_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { struct snd_pcm_runtime *runtime = substream->runtime; struct au1xpsc_audio_dmadata *pcd; int stype, ret; ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params)); if (ret < 0) goto out; stype = SUBSTREAM_TYPE(substream); pcd = au1xpsc_audio_pcmdma[stype]; DBG("runtime->dma_area = 0x%08lx dma_addr_t = 0x%08lx dma_size = %d " "runtime->min_align %d\n", (unsigned long)runtime->dma_area, (unsigned long)runtime->dma_addr, runtime->dma_bytes, runtime->min_align); DBG("bits %d frags %d frag_bytes %d is_rx %d\n", params->msbits, params_periods(params), params_period_bytes(params), stype); ret = au1x_pcm_dbdma_realloc(pcd, stype, params->msbits); if (ret) { MSG("DDMA channel (re)alloc failed!\n"); goto out; } pcd->substream = substream; pcd->period_bytes = params_period_bytes(params); pcd->periods = params_periods(params); pcd->dma_area_s = pcd->dma_area = (unsigned long)runtime->dma_addr; pcd->q_period = 0; pcd->curr_period = 0; pcd->pos = 0; ret = 0; out: return ret; } static int au1xpsc_pcm_hw_free(struct snd_pcm_substream *substream) { snd_pcm_lib_free_pages(substream); return 0; } static int au1xpsc_pcm_prepare(struct snd_pcm_substream *substream) { struct au1xpsc_audio_dmadata *pcd = au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)]; au1xxx_dbdma_reset(pcd->ddma_chan); if (SUBSTREAM_TYPE(substream) == PCM_RX) { au1x_pcm_queue_rx(pcd); au1x_pcm_queue_rx(pcd); } else { au1x_pcm_queue_tx(pcd); au1x_pcm_queue_tx(pcd); } return 0; } static int au1xpsc_pcm_trigger(struct snd_pcm_substream *substream, int cmd) { u32 c = au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)]->ddma_chan; switch (cmd) { case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: au1xxx_dbdma_start(c); break; case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_SUSPEND: au1xxx_dbdma_stop(c); break; default: return -EINVAL; } return 0; } static snd_pcm_uframes_t au1xpsc_pcm_pointer(struct snd_pcm_substream *substream) { return bytes_to_frames(substream->runtime, au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)]->pos); } static int au1xpsc_pcm_open(struct snd_pcm_substream *substream) { snd_soc_set_runtime_hwparams(substream, &au1xpsc_pcm_hardware); return 0; } static int au1xpsc_pcm_close(struct snd_pcm_substream *substream) { au1x_pcm_dbdma_free(au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)]); return 0; } static struct snd_pcm_ops au1xpsc_pcm_ops = { .open = au1xpsc_pcm_open, .close = au1xpsc_pcm_close, .ioctl = snd_pcm_lib_ioctl, .hw_params = au1xpsc_pcm_hw_params, .hw_free = au1xpsc_pcm_hw_free, .prepare = au1xpsc_pcm_prepare, .trigger = au1xpsc_pcm_trigger, .pointer = au1xpsc_pcm_pointer, }; static void au1xpsc_pcm_free_dma_buffers(struct snd_pcm *pcm) { snd_pcm_lib_preallocate_free_for_all(pcm); } static int au1xpsc_pcm_new(struct snd_card *card, struct snd_soc_dai *dai, struct snd_pcm *pcm) { snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, card->dev, AU1XPSC_BUFFER_MIN_BYTES, (4096 * 1024) - 1); return 0; } static int au1xpsc_pcm_probe(struct platform_device *pdev) { struct resource *r; int ret; if (au1xpsc_audio_pcmdma[PCM_TX] || au1xpsc_audio_pcmdma[PCM_RX]) return -EBUSY; /* TX DMA */ au1xpsc_audio_pcmdma[PCM_TX] = kzalloc(sizeof(struct au1xpsc_audio_dmadata), GFP_KERNEL); if (!au1xpsc_audio_pcmdma[PCM_TX]) return -ENOMEM; r = platform_get_resource(pdev, IORESOURCE_DMA, 0); if (!r) { ret = -ENODEV; goto out1; } (au1xpsc_audio_pcmdma[PCM_TX])->ddma_id = r->start; /* RX DMA */ au1xpsc_audio_pcmdma[PCM_RX] = kzalloc(sizeof(struct au1xpsc_audio_dmadata), GFP_KERNEL); if (!au1xpsc_audio_pcmdma[PCM_RX]) return -ENOMEM; r = platform_get_resource(pdev, IORESOURCE_DMA, 1); if (!r) { ret = -ENODEV; goto out2; } (au1xpsc_audio_pcmdma[PCM_RX])->ddma_id = r->start; return 0; out2: kfree(au1xpsc_audio_pcmdma[PCM_RX]); au1xpsc_audio_pcmdma[PCM_RX] = NULL; out1: kfree(au1xpsc_audio_pcmdma[PCM_TX]); au1xpsc_audio_pcmdma[PCM_TX] = NULL; return ret; } static int au1xpsc_pcm_remove(struct platform_device *pdev) { int i; for (i = 0; i < 2; i++) { if (au1xpsc_audio_pcmdma[i]) { au1x_pcm_dbdma_free(au1xpsc_audio_pcmdma[i]); kfree(au1xpsc_audio_pcmdma[i]); au1xpsc_audio_pcmdma[i] = NULL; } } return 0; } /* au1xpsc audio platform */ struct snd_soc_platform au1xpsc_soc_platform = { .name = "au1xpsc-pcm-dbdma", .probe = au1xpsc_pcm_probe, .remove = au1xpsc_pcm_remove, .pcm_ops = &au1xpsc_pcm_ops, .pcm_new = au1xpsc_pcm_new, .pcm_free = au1xpsc_pcm_free_dma_buffers, }; EXPORT_SYMBOL_GPL(au1xpsc_soc_platform); static int __init au1xpsc_audio_dbdma_init(void) { au1xpsc_audio_pcmdma[PCM_TX] = NULL; au1xpsc_audio_pcmdma[PCM_RX] = NULL; return snd_soc_register_platform(&au1xpsc_soc_platform); } static void __exit au1xpsc_audio_dbdma_exit(void) { snd_soc_unregister_platform(&au1xpsc_soc_platform); } module_init(au1xpsc_audio_dbdma_init); module_exit(au1xpsc_audio_dbdma_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Au12x0/Au1550 PSC Audio DMA driver"); MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>");