1 files changed, 116 insertions, 0 deletions

diff --git a/include/linux/acpi_dma.h b/include/linux/acpi_dma.h
new file mode 100644
index 000000000000..d09deabc7bf6
--- /dev/null
+++ b/include/linux/acpi_dma.h
@@ -0,0 +1,116 @@
+/*
+ * ACPI helpers for DMA request / controller
+ *
+ * Based on of_dma.h
+ *
+ * Copyright (C) 2013, Intel Corporation
+ * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.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_ACPI_DMA_H
+#define __LINUX_ACPI_DMA_H
+
+#include <linux/list.h>
+#include <linux/device.h>
+#include <linux/dmaengine.h>
+
+/**
+ * struct acpi_dma_spec - slave device DMA resources
+ * @chan_id:    channel unique id
+ * @slave_id:   request line unique id
+ * @dev:        struct device of the DMA controller to be used in the filter
+ *              function
+ */
+struct acpi_dma_spec {
+        int             chan_id;
+        int             slave_id;
+        struct device   *dev;
+};
+
+/**
+ * struct acpi_dma - representation of the registered DMAC
+ * @dma_controllers:    linked list node
+ * @dev:                struct device of this controller
+ * @acpi_dma_xlate:     callback function to find a suitable channel
+ * @data:               private data used by a callback function
+ */
+struct acpi_dma {
+        struct list_head        dma_controllers;
+        struct device           *dev;
+        struct dma_chan         *(*acpi_dma_xlate)
+                                (struct acpi_dma_spec *, struct acpi_dma *);
+        void                    *data;
+};
+
+/* Used with acpi_dma_simple_xlate() */
+struct acpi_dma_filter_info {
+        dma_cap_mask_t  dma_cap;
+        dma_filter_fn   filter_fn;
+};
+
+#ifdef CONFIG_DMA_ACPI
+
+int acpi_dma_controller_register(struct device *dev,
+                struct dma_chan *(*acpi_dma_xlate)
+                (struct acpi_dma_spec *, struct acpi_dma *),
+                void *data);
+int acpi_dma_controller_free(struct device *dev);
+int devm_acpi_dma_controller_register(struct device *dev,
+                struct dma_chan *(*acpi_dma_xlate)
+                (struct acpi_dma_spec *, struct acpi_dma *),
+                void *data);
+void devm_acpi_dma_controller_free(struct device *dev);
+
+struct dma_chan *acpi_dma_request_slave_chan_by_index(struct device *dev,
+                                                      size_t index);
+struct dma_chan *acpi_dma_request_slave_chan_by_name(struct device *dev,
+                                                     const char *name);
+
+struct dma_chan *acpi_dma_simple_xlate(struct acpi_dma_spec *dma_spec,
+                                       struct acpi_dma *adma);
+#else
+
+static inline int acpi_dma_controller_register(struct device *dev,
+                struct dma_chan *(*acpi_dma_xlate)
+                (struct acpi_dma_spec *, struct acpi_dma *),
+                void *data)
+{
+        return -ENODEV;
+}
+static inline int acpi_dma_controller_free(struct device *dev)
+{
+        return -ENODEV;
+}
+static inline int devm_acpi_dma_controller_register(struct device *dev,
+                struct dma_chan *(*acpi_dma_xlate)
+                (struct acpi_dma_spec *, struct acpi_dma *),
+                void *data)
+{
+        return -ENODEV;
+}
+static inline void devm_acpi_dma_controller_free(struct device *dev)
+{
+}
+
+static inline struct dma_chan *acpi_dma_request_slave_chan_by_index(
+                struct device *dev, size_t index)
+{
+        return NULL;
+}
+static inline struct dma_chan *acpi_dma_request_slave_chan_by_name(
+                struct device *dev, const char *name)
+{
+        return NULL;
+}
+
+#define acpi_dma_simple_xlate   NULL
+
+#endif
+
+#define acpi_dma_request_slave_channel  acpi_dma_request_slave_chan_by_index
+
+#endif /* __LINUX_ACPI_DMA_H */