cregit-Linux how code gets into the kernel

Release 4.13 sound/core/isadma.c

Directory: sound/core
/*
 *  ISA DMA support functions
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *
 *
 *   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
 *
 */

/*
 * Defining following add some delay. Maybe this helps for some broken
 * ISA DMA controllers.
 */


#undef HAVE_REALLY_SLOW_DMA_CONTROLLER

#include <linux/export.h>
#include <sound/core.h>
#include <asm/dma.h>

/**
 * snd_dma_program - program an ISA DMA transfer
 * @dma: the dma number
 * @addr: the physical address of the buffer
 * @size: the DMA transfer size
 * @mode: the DMA transfer mode, DMA_MODE_XXX
 *
 * Programs an ISA DMA transfer for the given buffer.
 */

void snd_dma_program(unsigned long dma, unsigned long addr, unsigned int size, unsigned short mode) { unsigned long flags; flags = claim_dma_lock(); disable_dma(dma); clear_dma_ff(dma); set_dma_mode(dma, mode); set_dma_addr(dma, addr); set_dma_count(dma, size); if (!(mode & DMA_MODE_NO_ENABLE)) enable_dma(dma); release_dma_lock(flags); }

Contributors

PersonTokensPropCommitsCommitProp
Jaroslav Kysela80100.00%2100.00%
Total80100.00%2100.00%

EXPORT_SYMBOL(snd_dma_program); /** * snd_dma_disable - stop the ISA DMA transfer * @dma: the dma number * * Stops the ISA DMA transfer. */
void snd_dma_disable(unsigned long dma) { unsigned long flags; flags = claim_dma_lock(); clear_dma_ff(dma); disable_dma(dma); release_dma_lock(flags); }

Contributors

PersonTokensPropCommitsCommitProp
Jaroslav Kysela33100.00%1100.00%
Total33100.00%1100.00%

EXPORT_SYMBOL(snd_dma_disable); /** * snd_dma_pointer - return the current pointer to DMA transfer buffer in bytes * @dma: the dma number * @size: the dma transfer size * * Return: The current pointer in DMA transfer buffer in bytes. */
unsigned int snd_dma_pointer(unsigned long dma, unsigned int size) { unsigned long flags; unsigned int result, result1; flags = claim_dma_lock(); clear_dma_ff(dma); if (!isa_dma_bridge_buggy) disable_dma(dma); result = get_dma_residue(dma); /* * HACK - read the counter again and choose higher value in order to * avoid reading during counter lower byte roll over if the * isa_dma_bridge_buggy is set. */ result1 = get_dma_residue(dma); if (!isa_dma_bridge_buggy) enable_dma(dma); release_dma_lock(flags); if (unlikely(result < result1)) result = result1; #ifdef CONFIG_SND_DEBUG if (result > size) pr_err("ALSA: pointer (0x%x) for DMA #%ld is greater than transfer size (0x%x)\n", result, dma, size); #endif if (result >= size || result == 0) return 0; else return size - result; }

Contributors

PersonTokensPropCommitsCommitProp
Jaroslav Kysela10380.47%466.67%
Krzysztof Helt2317.97%116.67%
Takashi Iwai21.56%116.67%
Total128100.00%6100.00%

EXPORT_SYMBOL(snd_dma_pointer);

Overall Contributors

PersonTokensPropCommitsCommitProp
Jaroslav Kysela22983.88%758.33%
Krzysztof Helt238.42%18.33%
Takashi Iwai176.23%216.67%
Paul Gortmaker31.10%18.33%
Yacine Belkadi10.37%18.33%
Total273100.00%12100.00%
Directory: sound/core
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