dm: core: add support for getting register address and size

Current dev_read_*() API lacks support to get address and size
of a "reg" property by name or index. Add support for the same.

Livetree support has been added but not tested on real hardware.

The existing unit tests testing reading address from device-tree
have been updated to test address as well as size.

Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>

5 files changed, 108 insertions, 4 deletions

diff --git a/drivers/core/fdtaddr.c b/drivers/core/fdtaddr.c
index c287386..6850003 100644
--- a/drivers/core/fdtaddr.c
+++ b/drivers/core/fdtaddr.c
@@ -129,6 +129,23 @@ fdt_addr_t devfdt_get_addr_name(struct udevice *dev, const char *name)
 #endif
 }
 
+fdt_addr_t devfdt_get_addr_size_name(struct udevice *dev, const char *name,
+				     fdt_size_t *size)
+{
+#if CONFIG_IS_ENABLED(OF_CONTROL)
+	int index;
+
+	index = fdt_stringlist_search(gd->fdt_blob, dev_of_offset(dev),
+				      "reg-names", name);
+	if (index < 0)
+		return index;
+
+	return devfdt_get_addr_size_index(dev, index, size);
+#else
+	return FDT_ADDR_T_NONE;
+#endif
+}
+
 fdt_addr_t devfdt_get_addr(struct udevice *dev)
 {
 	return devfdt_get_addr_index(dev, 0);
diff --git a/drivers/core/read.c b/drivers/core/read.c
index 1a044b0..8b5502d 100644
--- a/drivers/core/read.c
+++ b/drivers/core/read.c
@@ -82,6 +82,15 @@ fdt_addr_t dev_read_addr_index(struct udevice *dev, int index)
 		return devfdt_get_addr_index(dev, index);
 }
 
+fdt_addr_t dev_read_addr_size_index(struct udevice *dev, int index,
+				    fdt_size_t *size)
+{
+	if (ofnode_is_np(dev_ofnode(dev)))
+		return ofnode_get_addr_size_index(dev_ofnode(dev), index, size);
+	else
+		return devfdt_get_addr_size_index(dev, index, size);
+}
+
 void *dev_remap_addr_index(struct udevice *dev, int index)
 {
 	fdt_addr_t addr = dev_read_addr_index(dev, index);
@@ -102,6 +111,17 @@ fdt_addr_t dev_read_addr_name(struct udevice *dev, const char *name)
 		return dev_read_addr_index(dev, index);
 }
 
+fdt_addr_t dev_read_addr_size_name(struct udevice *dev, const char *name,
+				   fdt_size_t *size)
+{
+	int index = dev_read_stringlist_search(dev, "reg-names", name);
+
+	if (index < 0)
+		return FDT_ADDR_T_NONE;
+	else
+		return dev_read_addr_size_index(dev, index, size);
+}
+
 void *dev_remap_addr_name(struct udevice *dev, const char *name)
 {
 	fdt_addr_t addr = dev_read_addr_name(dev, name);
diff --git a/include/dm/fdtaddr.h b/include/dm/fdtaddr.h
index 3bc2599..57b326c 100644
--- a/include/dm/fdtaddr.h
+++ b/include/dm/fdtaddr.h
@@ -120,4 +120,22 @@ fdt_addr_t devfdt_get_addr_size_index(struct udevice *dev, int index,
  */
 fdt_addr_t devfdt_get_addr_name(struct udevice *dev, const char *name);
 
+/**
+ * devfdt_get_addr_size_name() - Get the reg property and its size for a device,
+ *				 indexed by name
+ *
+ * Returns the address and size specified in the 'reg' property of a device.
+ *
+ * @dev: Pointer to a device
+ * @name: the 'reg' property can hold a list of <addr, size> pairs, with the
+ *	  'reg-names' property providing named-based identification. @index
+ *	  indicates the value to search for in 'reg-names'.
+ * @size: Pointer to size variable - this function returns the size
+ *        specified in the 'reg' property here
+ *
+ * @return addr
+ */
+fdt_addr_t devfdt_get_addr_size_name(struct udevice *dev, const char *name,
+				     fdt_size_t *size);
+
 #endif
diff --git a/include/dm/read.h b/include/dm/read.h
index 6ecd062..0c62d62 100644
--- a/include/dm/read.h
+++ b/include/dm/read.h
@@ -145,6 +145,19 @@ int dev_read_size(struct udevice *dev, const char *propname);
 fdt_addr_t dev_read_addr_index(struct udevice *dev, int index);
 
 /**
+ * dev_read_addr_size_index() - Get the indexed reg property of a device
+ *
+ * @dev: Device to read from
+ * @index: the 'reg' property can hold a list of <addr, size> pairs
+ *	   and @index is used to select which one is required
+ * @size: place to put size value (on success)
+ *
+ * @return address or FDT_ADDR_T_NONE if not found
+ */
+fdt_addr_t dev_read_addr_size_index(struct udevice *dev, int index,
+				    fdt_size_t *size);
+
+/**
  * dev_remap_addr_index() - Get the indexed reg property of a device
  *                               as a memory-mapped I/O pointer
  *
@@ -169,6 +182,20 @@ void *dev_remap_addr_index(struct udevice *dev, int index);
 fdt_addr_t dev_read_addr_name(struct udevice *dev, const char* name);
 
 /**
+ * dev_read_addr_size_name() - Get the reg property of a device, indexed by name
+ *
+ * @dev: Device to read from
+ * @name: the 'reg' property can hold a list of <addr, size> pairs, with the
+ *	  'reg-names' property providing named-based identification. @index
+ *	  indicates the value to search for in 'reg-names'.
+ *  @size: place to put size value (on success)
+ *
+ * @return address or FDT_ADDR_T_NONE if not found
+ */
+fdt_addr_t dev_read_addr_size_name(struct udevice *dev, const char *name,
+				   fdt_size_t *size);
+
+/**
  * dev_remap_addr_name() - Get the reg property of a device, indexed by name,
  *                         as a memory-mapped I/O pointer
  *
@@ -601,12 +628,26 @@ static inline fdt_addr_t dev_read_addr_index(struct udevice *dev, int index)
 	return devfdt_get_addr_index(dev, index);
 }
 
+static inline fdt_addr_t dev_read_addr_size_index(struct udevice *dev,
+						  int index,
+						  fdt_size_t *size)
+{
+	return devfdt_get_addr_size_index(dev, index, size);
+}
+
 static inline fdt_addr_t dev_read_addr_name(struct udevice *dev,
 					    const char *name)
 {
 	return devfdt_get_addr_name(dev, name);
 }
 
+static inline fdt_addr_t dev_read_addr_size_name(struct udevice *dev,
+						 const char *name,
+						 fdt_size_t *size)
+{
+	return devfdt_get_addr_size_name(dev, name, size);
+}
+
 static inline fdt_addr_t dev_read_addr(struct udevice *dev)
 {
 	return devfdt_get_addr(dev);
diff --git a/test/dm/test-fdt.c b/test/dm/test-fdt.c
index ad85916..1fb8b5c 100644
--- a/test/dm/test-fdt.c
+++ b/test/dm/test-fdt.c
@@ -549,12 +549,14 @@ static int dm_test_fdt_remap_addr_index_flat(struct unit_test_state *uts)
 {
 	struct udevice *dev;
 	fdt_addr_t addr;
+	fdt_size_t size;
 	void *paddr;
 
 	ut_assertok(uclass_find_device_by_seq(UCLASS_TEST_DUMMY, 0, true, &dev));
 
-	addr = devfdt_get_addr_index(dev, 0);
+	addr = devfdt_get_addr_size_index(dev, 0, &size);
 	ut_asserteq(0x8000, addr);
+	ut_asserteq(0x1000, size);
 
 	paddr = map_physmem(addr, 0, MAP_NOCACHE);
 	ut_assertnonnull(paddr);
@@ -569,12 +571,14 @@ static int dm_test_fdt_remap_addr_name_flat(struct unit_test_state *uts)
 {
 	struct udevice *dev;
 	fdt_addr_t addr;
+	fdt_size_t size;
 	void *paddr;
 
 	ut_assertok(uclass_find_device_by_seq(UCLASS_TEST_DUMMY, 0, true, &dev));
 
-	addr = devfdt_get_addr_name(dev, "sandbox-dummy-0");
+	addr = devfdt_get_addr_size_name(dev, "sandbox-dummy-0", &size);
 	ut_asserteq(0x8000, addr);
+	ut_asserteq(0x1000, size);
 
 	paddr = map_physmem(addr, 0, MAP_NOCACHE);
 	ut_assertnonnull(paddr);
@@ -609,12 +613,14 @@ static int dm_test_fdt_remap_addr_index_live(struct unit_test_state *uts)
 {
 	struct udevice *dev;
 	fdt_addr_t addr;
+	fdt_size_t size;
 	void *paddr;
 
 	ut_assertok(uclass_find_device_by_seq(UCLASS_TEST_DUMMY, 0, true, &dev));
 
-	addr = dev_read_addr_index(dev, 0);
+	addr = dev_read_addr_size_index(dev, 0, &size);
 	ut_asserteq(0x8000, addr);
+	ut_asserteq(0x1000, size);
 
 	paddr = map_physmem(addr, 0, MAP_NOCACHE);
 	ut_assertnonnull(paddr);
@@ -629,12 +635,14 @@ static int dm_test_fdt_remap_addr_name_live(struct unit_test_state *uts)
 {
 	struct udevice *dev;
 	fdt_addr_t addr;
+	fdt_size_t size;
 	void *paddr;
 
 	ut_assertok(uclass_find_device_by_seq(UCLASS_TEST_DUMMY, 0, true, &dev));
 
-	addr = dev_read_addr_name(dev, "sandbox-dummy-0");
+	addr = dev_read_addr_size_name(dev, "sandbox-dummy-0", &size);
 	ut_asserteq(0x8000, addr);
+	ut_asserteq(0x1000, size);
 
 	paddr = map_physmem(addr, 0, MAP_NOCACHE);
 	ut_assertnonnull(paddr);