4 files changed, 67 insertions, 0 deletions
diff --git a/include/dm/device.h b/include/dm/device.h
index 28533ce0b6..bb9faa0ed9 100644
--- a/include/dm/device.h
+++ b/include/dm/device.h
@@ -159,6 +159,8 @@ enum {
  *		When CONFIG_DEVRES is enabled, devm_kmalloc() and friends will
  *		add to this list. Memory so-allocated will be freed
  *		automatically when the device is removed / unbound
+ * @dma_offset: Offset between the physical address space (CPU's) and the
+ *		device's bus address space
  */
 struct udevice {
 	const struct driver *driver;
@@ -183,6 +185,9 @@ struct udevice {
 #ifdef CONFIG_DEVRES
 	struct list_head devres_head;
 #endif
+#if CONFIG_IS_ENABLED(DM_DMA)
+	ulong dma_offset;
+#endif
 };
 
 /* Maximum sequence number supported */
@@ -224,6 +229,14 @@ static inline ofnode dev_ofnode(const struct udevice *dev)
 /* Returns non-zero if the device is active (probed and not removed) */
 #define device_active(dev)	(dev_get_flags(dev) & DM_FLAG_ACTIVATED)
 
+#if CONFIG_IS_ENABLED(DM_DMA)
+#define dev_set_dma_offset(_dev, _offset)	_dev->dma_offset = _offset
+#define dev_get_dma_offset(_dev)		_dev->dma_offset
+#else
+#define dev_set_dma_offset(_dev, _offset)
+#define dev_get_dma_offset(_dev)		0
+#endif
+
 static inline int dev_of_offset(const struct udevice *dev)
 {
 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
diff --git a/include/dm/of_addr.h b/include/dm/of_addr.h
index 3fa1ffce81..ee21d5cf4f 100644
--- a/include/dm/of_addr.h
+++ b/include/dm/of_addr.h
@@ -44,6 +44,23 @@ u64 of_translate_address(const struct device_node *no, const __be32 *in_addr);
  */
 u64 of_translate_dma_address(const struct device_node *no, const __be32 *in_addr);
 
+
+/**
+ * of_get_dma_range() - get dma-ranges for a specific DT node
+ *
+ * Get DMA ranges for a specifc node, this is useful to perform bus->cpu and
+ * cpu->bus address translations
+ *
+ * @param blob		Pointer to device tree blob
+ * @param node_offset	Node DT offset
+ * @param cpu		Pointer to variable storing the range's cpu address
+ * @param bus		Pointer to variable storing the range's bus address
+ * @param size		Pointer to variable storing the range's size
+ * @return translated DMA address or OF_BAD_ADDR on error
+ */
+int of_get_dma_range(const struct device_node *dev, phys_addr_t *cpu,
+		     dma_addr_t *bus, u64 *size);
+
 /**
  * of_get_address() - obtain an address from a node
  *
diff --git a/include/dm/ofnode.h b/include/dm/ofnode.h
index 5318d65035..2c0597c407 100644
--- a/include/dm/ofnode.h
+++ b/include/dm/ofnode.h
@@ -999,6 +999,22 @@ u64 ofnode_translate_address(ofnode node, const fdt32_t *in_addr);
 u64 ofnode_translate_dma_address(ofnode node, const fdt32_t *in_addr);
 
 /**
+ * ofnode_get_dma_range() - get dma-ranges for a specific DT node
+ *
+ * Get DMA ranges for a specifc node, this is useful to perform bus->cpu and
+ * cpu->bus address translations
+ *
+ * @param blob		Pointer to device tree blob
+ * @param node_offset	Node DT offset
+ * @param cpu		Pointer to variable storing the range's cpu address
+ * @param bus		Pointer to variable storing the range's bus address
+ * @param size		Pointer to variable storing the range's size
+ * @return translated DMA address or OF_BAD_ADDR on error
+ */
+int ofnode_get_dma_range(ofnode node, phys_addr_t *cpu, dma_addr_t *bus,
+			 u64 *size);
+
+/**
  * ofnode_device_is_compatible() - check if the node is compatible with compat
  *
  * This allows to check whether the node is comaptible with the compat.
diff --git a/include/dm/read.h b/include/dm/read.h
index 97575bcad0..5bf3405614 100644
--- a/include/dm/read.h
+++ b/include/dm/read.h
@@ -648,6 +648,21 @@ u64 dev_translate_dma_address(const struct udevice *dev,
 			      const fdt32_t *in_addr);
 
 /**
+ * dev_get_dma_range() - Get a device's DMA constraints
+ *
+ * Provide the address bases and size of the linear mapping between the CPU and
+ * a device's BUS address space.
+ *
+ * @dev: device giving the context in which to translate the DMA address
+ * @cpu: base address for CPU's view of memory
+ * @bus: base address for BUS's view of memory
+ * @size: size of the address space
+ * @return 0 if ok, negative on error
+ */
+int dev_get_dma_range(const struct udevice *dev, phys_addr_t *cpu,
+		      dma_addr_t *bus, u64 *size);
+
+/**
  * dev_read_alias_highest_id - Get highest alias id for the given stem
  * @stem:	Alias stem to be examined
  *
@@ -1005,6 +1020,12 @@ static inline u64 dev_translate_dma_address(const struct udevice *dev,
 	return ofnode_translate_dma_address(dev_ofnode(dev), in_addr);
 }
 
+static inline int dev_get_dma_range(const struct udevice *dev, phys_addr_t *cpu,
+				    dma_addr_t *bus, u64 *size)
+{
+	return ofnode_get_dma_range(dev_ofnode(dev), cpu, bus, size);
+}
+
 static inline int dev_read_alias_highest_id(const char *stem)
 {
 	if (!CONFIG_IS_ENABLED(OF_LIBFDT) || !gd->fdt_blob)