litmus-rt.git - The LITMUS^RT kernel.

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author	Linus Torvalds <torvalds@linux-foundation.org>	2010-08-11 12:19:43 -0400
committer	Linus Torvalds <torvalds@linux-foundation.org>	2010-08-11 12:19:43 -0400
commit	bf25db365428dbd182768baa9850bef7afaac80d (patch)
tree	4373037b00459643f0d661672eb6688f80800d72 /fs/btrfs/ctree.c
parent	682c30ed2165d5694a414d31eac7c63ac5700fb0 (diff)
parent	5002dd18c5940ce63b917d84f2b852c3b96009bb (diff)

Merge branch 'for-linus' of git://git.open-osd.org/linux-open-osd

* 'for-linus' of git://git.open-osd.org/linux-open-osd: exofs: Fix groups code when num_devices is not divisible by group_width exofs: Remove useless optimization exofs: exofs_file_fsync and exofs_file_flush correctness exofs: Remove superfluous dependency on buffer_head and writeback

Diffstat (limited to 'fs/btrfs/ctree.c')

0 files changed, 0 insertions, 0 deletions

/* * Au12x0/Au1550 PSC ALSA ASoC audio support. * * (c) 2007-2008 MSC Vertriebsges.m.b.H., * Manuel Lauss <manuel.lauss@gmail.com> * * 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. * */ #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) */ dma_addr_t dma_area; /* address of queued DMA area */ dma_addr_t 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; }; /* * 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 /* 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, .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(cd->ddma_chan, 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(cd->ddma_chan, 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;


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