dm: Introduce xxx_get_dma_range()
Add the following functions to get a specific device's DMA ranges:
- dev_get_dma_range()
- ofnode_get_dma_range()
- of_get_dma_range()
- fdt_get_dma_range()
They are specially useful in oder to be able validate a physical address
space range into a bus's and to convert addresses from and to address
spaces.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Peter Robinson <pbrobinson@gmail.com>
Signed-off-by: Matthias Brugger <mbrugger@suse.com>
diff --git a/include/dm/read.h b/include/dm/read.h
index 97575bc..5bf3405 100644
--- a/include/dm/read.h
+++ b/include/dm/read.h
@@ -648,6 +648,21 @@
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 @@
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)