From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/sound/core/isadma.c | 117 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 117 insertions(+) create mode 100644 kernel/sound/core/isadma.c (limited to 'kernel/sound/core/isadma.c') diff --git a/kernel/sound/core/isadma.c b/kernel/sound/core/isadma.c new file mode 100644 index 000000000..31e8544d7 --- /dev/null +++ b/kernel/sound/core/isadma.c @@ -0,0 +1,117 @@ +/* + * ISA DMA support functions + * Copyright (c) by Jaroslav Kysela + * + * + * 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 +#include +#include + +/** + * 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); +} + +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); +} + +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; +} + +EXPORT_SYMBOL(snd_dma_pointer); -- cgit 1.2.3-korg