1 files changed, 118 insertions, 0 deletions

diff --git a/include/sound/memalloc.h b/include/sound/memalloc.h
new file mode 100644
index 000000000000..3a2fd2cc9f19
--- /dev/null
+++ b/include/sound/memalloc.h
@@ -0,0 +1,118 @@
+/*
+ *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
+ *                   Takashi Iwai <tiwai@suse.de>
+ * 
+ *  Generic memory allocators
+ *
+ *
+ *   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
+ *
+ */
+
+#ifndef __SOUND_MEMALLOC_H
+#define __SOUND_MEMALLOC_H
+
+struct device;
+
+/*
+ * buffer device info
+ */
+struct snd_dma_device {
+        int type;                       /* SNDRV_DMA_TYPE_XXX */
+        struct device *dev;             /* generic device */
+};
+
+#ifndef snd_dma_pci_data
+#define snd_dma_pci_data(pci)   (&(pci)->dev)
+#define snd_dma_isa_data()      NULL
+#define snd_dma_sbus_data(sbus) ((struct device *)(sbus))
+#define snd_dma_continuous_data(x)      ((struct device *)(unsigned long)(x))
+#endif
+
+
+/*
+ * buffer types
+ */
+#define SNDRV_DMA_TYPE_UNKNOWN          0       /* not defined */
+#define SNDRV_DMA_TYPE_CONTINUOUS       1       /* continuous no-DMA memory */
+#define SNDRV_DMA_TYPE_DEV              2       /* generic device continuous */
+#define SNDRV_DMA_TYPE_DEV_SG           3       /* generic device SG-buffer */
+#define SNDRV_DMA_TYPE_SBUS             4       /* SBUS continuous */
+
+/*
+ * info for buffer allocation
+ */
+struct snd_dma_buffer {
+        struct snd_dma_device dev;      /* device type */
+        unsigned char *area;    /* virtual pointer */
+        dma_addr_t addr;        /* physical address */
+        size_t bytes;           /* buffer size in bytes */
+        void *private_data;     /* private for allocator; don't touch */
+};
+
+/*
+ * Scatter-Gather generic device pages
+ */
+struct snd_sg_page {
+        void *buf;
+        dma_addr_t addr;
+};
+
+struct snd_sg_buf {
+        int size;       /* allocated byte size */
+        int pages;      /* allocated pages */
+        int tblsize;    /* allocated table size */
+        struct snd_sg_page *table;      /* address table */
+        struct page **page_table;       /* page table (for vmap/vunmap) */
+        struct device *dev;
+};
+
+/*
+ * return the pages matching with the given byte size
+ */
+static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
+{
+        return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
+}
+
+/*
+ * return the physical address at the corresponding offset
+ */
+static inline dma_addr_t snd_sgbuf_get_addr(struct snd_sg_buf *sgbuf, size_t offset)
+{
+        return sgbuf->table[offset >> PAGE_SHIFT].addr + offset % PAGE_SIZE;
+}
+
+
+/* allocate/release a buffer */
+int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
+                        struct snd_dma_buffer *dmab);
+int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
+                                 struct snd_dma_buffer *dmab);
+void snd_dma_free_pages(struct snd_dma_buffer *dmab);
+
+/* buffer-preservation managements */
+
+#define snd_dma_pci_buf_id(pci) (((unsigned int)(pci)->vendor << 16) | (pci)->device)
+
+size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id);
+int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id);
+
+/* basic memory allocation functions */
+void *snd_malloc_pages(size_t size, unsigned int gfp_flags);
+void snd_free_pages(void *ptr, size_t size);
+
+#endif /* __SOUND_MEMALLOC_H */
+