Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / sound / core / isadma.c

diff --git a/kernel/sound/core/isadma.c b/kernel/sound/core/isadma.c
new file mode 100644 (file)
index 0000000..31e8544
--- /dev/null
+++ b/kernel/sound/core/isadma.c
@@ -0,0 +1,117 @@
+/*
+ *  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);
+}
+
+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);