/* * atmel-pcm-dma.c -- ALSA PCM DMA support for the Atmel SoC. * * Copyright (C) 2012 Atmel * * Author: Bo Shen * * Based on atmel-pcm by: * Sedji Gaouaou * Copyright 2008 Atmel * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "atmel-pcm.h" /*--------------------------------------------------------------------------*\ * Hardware definition \*--------------------------------------------------------------------------*/ static const struct snd_pcm_hardware atmel_pcm_dma_hardware = { .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_PAUSE, .period_bytes_min = 256, /* lighting DMA overhead */ .period_bytes_max = 2 * 0xffff, /* if 2 bytes format */ .periods_min = 8, .periods_max = 1024, /* no limit */ .buffer_bytes_max = 512 * 1024, }; /** * atmel_pcm_dma_irq: SSC interrupt handler for DMAENGINE enabled SSC * * We use DMAENGINE to send/receive data to/from SSC so this ISR is only to * check if any overrun occured. */ static void atmel_pcm_dma_irq(u32 ssc_sr, struct snd_pcm_substream *substream) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct atmel_pcm_dma_params *prtd; prtd = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); if (ssc_sr & prtd->mask->ssc_error) { if (snd_pcm_running(substream)) pr_warn("atmel-pcm: buffer %s on %s (SSC_SR=%#x)\n", substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? "underrun" : "overrun", prtd->name, ssc_sr); /* stop RX and capture: will be enabled again at restart */ ssc_writex(prtd->ssc->regs, SSC_CR, prtd->mask->ssc_disable); snd_pcm_stop_xrun(substream); /* now drain RHR and read status to remove xrun condition */ ssc_readx(prtd->ssc->regs, SSC_RHR); ssc_readx(prtd->ssc->regs, SSC_SR); } } static int atmel_pcm_configure_dma(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct atmel_pcm_dma_params *prtd; struct ssc_device *ssc; int ret; prtd = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); ssc = prtd->ssc; ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config); if (ret) { pr_err("atmel-pcm: hwparams to dma slave configure failed\n"); return ret; } slave_config->dst_addr = ssc->phybase + SSC_THR; slave_config->dst_maxburst = 1; slave_config->src_addr = ssc->phybase + SSC_RHR; slave_config->src_maxburst = 1; prtd->dma_intr_handler = atmel_pcm_dma_irq; return 0; } static const struct snd_dmaengine_pcm_config atmel_dmaengine_pcm_config = { .prepare_slave_config = atmel_pcm_configure_dma, .pcm_hardware = &atmel_pcm_dma_hardware, .prealloc_buffer_size = 64 * 1024, }; int atmel_pcm_dma_platform_register(struct device *dev) { return snd_dmaengine_pcm_register(dev, &atmel_dmaengine_pcm_config, 0); } EXPORT_SYMBOL(atmel_pcm_dma_platform_register); void atmel_pcm_dma_platform_unregister(struct device *dev) { snd_dmaengine_pcm_unregister(dev); } EXPORT_SYMBOL(atmel_pcm_dma_platform_unregister); MODULE_AUTHOR("Bo Shen "); MODULE_DESCRIPTION("Atmel DMA based PCM module"); MODULE_LICENSE("GPL"); ='label'>space:mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2017-01-15 12:03:11 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-01-15 12:03:11 -0800
commit83346fbc07d267de777e2597552f785174ad0373 (patch)
treeb321fa8a652b04bc3745be183252ef024a3ba4be /drivers/usb/gadget/function/u_phonet.h
parenta11ce3a4ac0ad78618cddb9ce16def7486f2707d (diff)
parent453828625731d0ba7218242ef6ec88f59408f368 (diff)
Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Ingo Molnar: "Misc fixes: - unwinder fixes - AMD CPU topology enumeration fixes - microcode loader fixes - x86 embedded platform fixes - fix for a bootup crash that may trigger when clearcpuid= is used with invalid values" * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/mpx: Use compatible types in comparison to fix sparse error x86/tsc: Add the Intel Denverton Processor to native_calibrate_tsc() x86/entry: Fix the end of the stack for newly forked tasks x86/unwind: Include __schedule() in stack traces x86/unwind: Disable KASAN checks for non-current tasks x86/unwind: Silence warnings for non-current tasks x86/microcode/intel: Use correct buffer size for saving microcode data x86/microcode/intel: Fix allocation size of struct ucode_patch x86/microcode/intel: Add a helper which gives the microcode revision x86/microcode: Use native CPUID to tickle out microcode revision x86/CPU: Add native CPUID variants returning a single datum x86/boot: Add missing declaration of string functions x86/CPU/AMD: Fix Bulldozer topology x86/platform/intel-mid: Rename 'spidev' to 'mrfld_spidev' x86/cpu: Fix typo in the comment for Anniedale x86/cpu: Fix bootup crashes by sanitizing the argument of the 'clearcpuid=' command-line option
Diffstat (limited to 'drivers/usb/gadget/function/u_phonet.h')