Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / include / linux / of_dma.h

diff --git a/kernel/include/linux/of_dma.h b/kernel/include/linux/of_dma.h
new file mode 100644 (file)
index 0000000..56bc026
--- /dev/null
+++ b/kernel/include/linux/of_dma.h
@@ -0,0 +1,75 @@
+/*
+ * OF helpers for DMA request / controller
+ *
+ * Based on of_gpio.h
+ *
+ * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * 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 __LINUX_OF_DMA_H
+#define __LINUX_OF_DMA_H
+
+#include <linux/of.h>
+#include <linux/dmaengine.h>
+
+struct device_node;
+
+struct of_dma {
+       struct list_head        of_dma_controllers;
+       struct device_node      *of_node;
+       struct dma_chan         *(*of_dma_xlate)
+                               (struct of_phandle_args *, struct of_dma *);
+       void                    *of_dma_data;
+};
+
+struct of_dma_filter_info {
+       dma_cap_mask_t  dma_cap;
+       dma_filter_fn   filter_fn;
+};
+
+#ifdef CONFIG_OF
+extern int of_dma_controller_register(struct device_node *np,
+               struct dma_chan *(*of_dma_xlate)
+               (struct of_phandle_args *, struct of_dma *),
+               void *data);
+extern void of_dma_controller_free(struct device_node *np);
+extern struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
+                                                    const char *name);
+extern struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec,
+               struct of_dma *ofdma);
+extern struct dma_chan *of_dma_xlate_by_chan_id(struct of_phandle_args *dma_spec,
+               struct of_dma *ofdma);
+#else
+static inline int of_dma_controller_register(struct device_node *np,
+               struct dma_chan *(*of_dma_xlate)
+               (struct of_phandle_args *, struct of_dma *),
+               void *data)
+{
+       return -ENODEV;
+}
+
+static inline void of_dma_controller_free(struct device_node *np)
+{
+}
+
+static inline struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
+                                                    const char *name)
+{
+       return NULL;
+}
+
+static inline struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec,
+               struct of_dma *ofdma)
+{
+       return NULL;
+}
+
+#define of_dma_xlate_by_chan_id NULL
+
+#endif
+
+#endif /* __LINUX_OF_DMA_H */