fdt: translate address if #size-cells = <0>

The __of_translate_address routine translates an address from the
device tree into a CPU physical address. A note in the description of
the routine explains that the crossing of any level with
since inherited from IBM. This does not happen for Texas Instruments, or
at least for the beaglebone device tree. Without this patch, in fact,
the translation into physical addresses of the registers contained in the
am33xx-clocks.dtsi nodes would not be possible. They all have a parent
with #size-cells = <0>.

The CONFIG_OF_TRANSLATE_ZERO_SIZE_CELLS symbol makes translation
possible even in the case of crossing levels with #size-cells = <0>.

The patch acts conservatively on address translation, except for
removing a check within the of_translate_one function in the
drivers/core/of_addr.c file:

+
        ranges = of_get_property(parent, rprop, &rlen);
-       if (ranges == NULL && !of_empty_ranges_quirk(parent)) {
-               debug("no ranges; cannot translate\n");
-               return 1;
-       }
        if (ranges == NULL || rlen == 0) {
                offset = of_read_number(addr, na);
                memset(addr, 0, pna * 4);
		debug("empty ranges; 1:1 translation\n");

There are two reasons:
1 The function of_empty_ranges_quirk always returns false, invalidating
  the following if statement in case of null ranges. Therefore one of
  the two checks is useless.

2 The implementation of the of_translate_one function found in the
  common/fdt_support.c file has removed this check while keeping the one
  about the 1:1 translation.

The patch adds a test and modifies a check for the correctness of an
address in the case of enabling translation also for zero size cells.
The added test checks translations of addresses generated by nodes of
a device tree similar to those you can find in the files am33xx.dtsi
and am33xx-clocks.dtsi for which the patch was created.

The patch was also tested on a beaglebone black board. The addresses
generated for the registers of the loaded drivers are those specified
by the AM335x reference manual.

Signed-off-by: Dario Binacchi <dariobin@libero.it>
Tested-by: Dario Binacchi <dariobin@libero.it>
Reviewed-by: Simon Glass <sjg@chromium.org>

5 files changed, 24 insertions, 13 deletions

diff --git a/drivers/core/Kconfig b/drivers/core/Kconfig
index 65a503e76d..dbfe51c6e8 100644
--- a/drivers/core/Kconfig
+++ b/drivers/core/Kconfig
@@ -247,6 +247,18 @@ config OF_TRANSLATE
 	  used for the address translation. This function is faster and
 	  smaller in size than fdt_translate_address().
 
+config OF_TRANSLATE_ZERO_SIZE_CELLS
+	bool "Enable translation for zero size cells"
+	depends on OF_TRANSLATE
+	default n
+	help
+	  The routine used to translate an FDT address into a physical CPU
+	  address was developed by IBM. It considers that crossing any level
+	  with #size-cells = <0> makes translation impossible, even if it is
+	  not the way it was specified.
+	  Enabling this option makes translation possible even in the case
+	  of crossing levels with #size-cells = <0>.
+
 config SPL_OF_TRANSLATE
 	bool "Translate addresses using fdt_translate_address in SPL"
 	depends on SPL_DM && SPL_OF_CONTROL
diff --git a/drivers/core/fdtaddr.c b/drivers/core/fdtaddr.c
index 8b48aa5bc5..ed55f69de1 100644
--- a/drivers/core/fdtaddr.c
+++ b/drivers/core/fdtaddr.c
@@ -49,7 +49,7 @@ fdt_addr_t devfdt_get_addr_index(const struct udevice *dev, int index)
 
 		reg += index * (na + ns);
 
-		if (ns) {
+		if (ns || gd_size_cells_0()) {
 			/*
 			 * Use the full-fledged translate function for complex
 			 * bus setups.
diff --git a/drivers/core/of_addr.c b/drivers/core/of_addr.c
index ca34d84922..bbe80136ba 100644
--- a/drivers/core/of_addr.c
+++ b/drivers/core/of_addr.c
@@ -18,7 +18,8 @@
 /* Max address size we deal with */
 #define OF_MAX_ADDR_CELLS	4
 #define OF_CHECK_ADDR_COUNT(na)	((na) > 0 && (na) <= OF_MAX_ADDR_CELLS)
-#define OF_CHECK_COUNTS(na, ns)	(OF_CHECK_ADDR_COUNT(na) && (ns) > 0)
+#define OF_CHECK_COUNTS(na, ns)	(OF_CHECK_ADDR_COUNT(na) && \
+				 ((ns) > 0 || gd_size_cells_0()))
 
 static struct of_bus *of_match_bus(struct device_node *np);
 
@@ -162,11 +163,6 @@ const __be32 *of_get_address(const struct device_node *dev, int index,
 }
 EXPORT_SYMBOL(of_get_address);
 
-static int of_empty_ranges_quirk(const struct device_node *np)
-{
-	return false;
-}
-
 static int of_translate_one(const struct device_node *parent,
 			    struct of_bus *bus, struct of_bus *pbus,
 			    __be32 *addr, int na, int ns, int pna,
@@ -193,11 +189,8 @@ static int of_translate_one(const struct device_node *parent,
 	 * As far as we know, this damage only exists on Apple machines, so
 	 * This code is only enabled on powerpc. --gcl
 	 */
+
 	ranges = of_get_property(parent, rprop, &rlen);
-	if (ranges == NULL && !of_empty_ranges_quirk(parent)) {
-		debug("no ranges; cannot translate\n");
-		return 1;
-	}
 	if (ranges == NULL || rlen == 0) {
 		offset = of_read_number(addr, na);
 		memset(addr, 0, pna * 4);
diff --git a/drivers/core/ofnode.c b/drivers/core/ofnode.c
index 2a6e43ddc6..7a5f4c0a73 100644
--- a/drivers/core/ofnode.c
+++ b/drivers/core/ofnode.c
@@ -316,7 +316,8 @@ fdt_addr_t ofnode_get_addr_size_index(ofnode node, int index, fdt_size_t *size)
 
 		ns = of_n_size_cells(ofnode_to_np(node));
 
-		if (IS_ENABLED(CONFIG_OF_TRANSLATE) && ns > 0) {
+		if (IS_ENABLED(CONFIG_OF_TRANSLATE) &&
+		    (ns > 0 || gd_size_cells_0())) {
 			return of_translate_address(ofnode_to_np(node), prop_val);
 		} else {
 			na = of_n_addr_cells(ofnode_to_np(node));
@@ -690,8 +691,10 @@ fdt_addr_t ofnode_get_addr_size(ofnode node, const char *property,
 		ns = of_n_size_cells(np);
 		*sizep = of_read_number(prop + na, ns);
 
-		if (CONFIG_IS_ENABLED(OF_TRANSLATE) && ns > 0)
+		if (CONFIG_IS_ENABLED(OF_TRANSLATE) &&
+		    (ns > 0 || gd_size_cells_0())) {
 			return of_translate_address(np, prop);
+		}
 		else
 			return of_read_number(prop, na);
 	} else {
diff --git a/drivers/core/root.c b/drivers/core/root.c
index 78de7cdf87..2bfa75b472 100644
--- a/drivers/core/root.c
+++ b/drivers/core/root.c
@@ -132,6 +132,9 @@ int dm_init(bool of_live)
 {
 	int ret;
 
+	if (IS_ENABLED(CONFIG_OF_TRANSLATE_ZERO_SIZE_CELLS))
+		gd->dm_flags |= GD_DM_FLG_SIZE_CELLS_0;
+
 	if (gd->dm_root) {
 		dm_warn("Virtual root driver already exists!\n");
 		return -EINVAL;