Introduce of_dma_get_max_cpu_address(), which provides the highest CPU
physical address addressable by all DMA masters in the system. It's
specially useful for setting memory zones sizes at early boot time.

Signed-off-by: Nicolas Saenz Julienne <redacted>

---

Changes since v2:
 - Use PHYS_ADDR_MAX
 - return phys_dma_t
 - Rename function
 - Correct subject
 - Add support to start parsing from an arbitrary device node in order
   for the function to work with unit tests

 drivers/of/address.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 include/linux/of.h   |  7 +++++++
 2 files changed, 49 insertions(+)

diff --git a/drivers/of/address.c b/drivers/of/address.c
index eb9ab4f1e80b..b5a9695aaf82 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c

@@ -1024,6 +1024,48 @@ int of_dma_get_range(struct device_node *np, const struct bus_dma_region **map)
 }
 #endif /* CONFIG_HAS_DMA */

+/**
+ * of_dma_get_max_cpu_address - Gets highest CPU address suitable for DMA
+ * @np: The node to start searching from or NULL to start from the root
+ *
+ * Gets the highest CPU physical address that is addressable by all DMA masters
+ * in the system (or subtree when np is non-NULL). If no DMA constrained device
+ * is found, it returns PHYS_ADDR_MAX.
+ */
+phys_addr_t __init of_dma_get_max_cpu_address(struct device_node *np)
+{
+       phys_addr_t max_cpu_addr = PHYS_ADDR_MAX;

+       if (ranges && len) {
+               of_dma_range_parser_init(&parser, np);
+               for_each_of_range(&parser, &range)
+                       if (range.cpu_addr + range.size > cpu_end)
+                               cpu_end = range.cpu_addr + range.size;
+
+               if (max_cpu_addr > cpu_end)
+                       max_cpu_addr = cpu_end;
+       }
+
+       for_each_available_child_of_node(np, child) {
+               subtree_max_addr = of_dma_get_max_cpu_address(child);
+               if (max_cpu_addr > subtree_max_addr)
+                       max_cpu_addr = subtree_max_addr;
+       }
+
+       return max_cpu_addr;
+}
+
 /**
  * of_dma_is_coherent - Check if device is coherent
  * @np:        device node

diff --git a/include/linux/of.h b/include/linux/of.h
index 481ec0467285..db8db8f2c967 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h

@@ -558,6 +558,8 @@ int of_map_id(struct device_node *np, u32 id,
               const char *map_name, const char *map_mask_name,
               struct device_node **target, u32 *id_out);

+phys_addr_t of_dma_get_max_cpu_address(struct device_node *np);
+
 #else /* CONFIG_OF */

 static inline void of_core_init(void)

@@ -995,6 +997,11 @@ static inline int of_map_id(struct device_node *np, u32 id,
        return -EINVAL;
 }

+static inline phys_addr_t of_dma_get_max_cpu_address(struct device_node *np)
+{
+       return PHYS_ADDR_MAX;
+}
+
 #define of_match_ptr(_ptr)     NULL
 #define of_match_node(_matches, _node) NULL
 #endif /* CONFIG_OF */
--

2.28.0