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authorGuanXuetao <gxt@mprc.pku.edu.cn>2011-01-15 18:18:29 +0800
committerGuanXuetao <gxt@mprc.pku.edu.cn>2011-03-17 09:19:09 +0800
commit10c9c10c31514564b09c153432a42ffaea3ce831 (patch)
tree04a60b9a1e48eaa2d9346e265a1c2fe2db5ec670 /arch/unicore32/include/mach
parent56372b0b2f533c9a25bd40a0577405f6ddb7cff2 (diff)
unicore32 core architecture: mm related: consistent device DMA handling
This patch implements consistent device DMA handling of memory management. DMA device operations are also here. Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/unicore32/include/mach')
-rw-r--r--arch/unicore32/include/mach/dma.h41
1 files changed, 41 insertions, 0 deletions
diff --git a/arch/unicore32/include/mach/dma.h b/arch/unicore32/include/mach/dma.h
new file mode 100644
index 000000000000..3e3224a10525
--- /dev/null
+++ b/arch/unicore32/include/mach/dma.h
@@ -0,0 +1,41 @@
+/*
+ * linux/arch/unicore32/include/mach/dma.h
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __MACH_PUV3_DMA_H__
+#define __MACH_PUV3_DMA_H__
+
+/*
+ * The PKUnity has six internal DMA channels.
+ */
+#define MAX_DMA_CHANNELS 6
+
+typedef enum {
+ DMA_PRIO_HIGH = 0,
+ DMA_PRIO_MEDIUM = 1,
+ DMA_PRIO_LOW = 2
+} puv3_dma_prio;
+
+/*
+ * DMA registration
+ */
+
+extern int puv3_request_dma(char *name,
+ puv3_dma_prio prio,
+ void (*irq_handler)(int, void *),
+ void (*err_handler)(int, void *),
+ void *data);
+
+extern void puv3_free_dma(int dma_ch);
+
+#define puv3_stop_dma(ch) (DMAC_CONFIG(ch) &= ~DMAC_CONFIG_EN)
+#define puv3_resume_dma(ch) (DMAC_CONFIG(ch) |= DMAC_CONFIG_EN)
+
+#endif /* __MACH_PUV3_DMA_H__ */