1 files changed, 79 insertions, 1 deletions

diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
index d50101d44795..de69fb37098c 100644
--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -2394,6 +2394,75 @@ static int of_dev_hwmod_lookup(struct device_node *np,
 }
 
 /**
+ * omap_hwmod_parse_module_range - map module IO range from device tree
+ * @oh: struct omap_hwmod *
+ * @np: struct device_node *
+ *
+ * Parse the device tree range an interconnect target module provides
+ * for it's child device IP blocks. This way we can support the old
+ * "ti,hwmods" property with just dts data without a need for platform
+ * data for IO resources. And we don't need all the child IP device
+ * nodes available in the dts.
+ */
+int omap_hwmod_parse_module_range(struct omap_hwmod *oh,
+				  struct device_node *np,
+				  struct resource *res)
+{
+	struct property *prop;
+	const __be32 *ranges;
+	const char *name;
+	u32 nr_addr, nr_size;
+	u64 base, size;
+	int len, error;
+
+	if (!res)
+		return -EINVAL;
+
+	ranges = of_get_property(np, "ranges", &len);
+	if (!ranges)
+		return -ENOENT;
+
+	len /= sizeof(*ranges);
+
+	if (len < 3)
+		return -EINVAL;
+
+	of_property_for_each_string(np, "compatible", prop, name)
+		if (!strncmp("ti,sysc-", name, 8))
+			break;
+
+	if (!name)
+		return -ENOENT;
+
+	error = of_property_read_u32(np, "#address-cells", &nr_addr);
+	if (error)
+		return -ENOENT;
+
+	error = of_property_read_u32(np, "#size-cells", &nr_size);
+	if (error)
+		return -ENOENT;
+
+	if (nr_addr != 1 || nr_size != 1) {
+		pr_err("%s: invalid range for %s->%s\n", __func__,
+		       oh->name, np->name);
+		return -EINVAL;
+	}
+
+	ranges++;
+	base = of_translate_address(np, ranges++);
+	size = be32_to_cpup(ranges);
+
+	pr_debug("omap_hwmod: %s %s at 0x%llx size 0x%llx\n",
+		 oh->name, np->name, base, size);
+
+	res->start = base;
+	res->end = base + size - 1;
+	res->flags = IORESOURCE_MEM;
+
+	return 0;
+}
+
+/**
  * _init_mpu_rt_base - populate the virtual address for a hwmod
  * @oh: struct omap_hwmod * to locate the virtual address
  * @data: (unused, caller should pass NULL)
@@ -2415,6 +2484,8 @@ static int __init _init_mpu_rt_base(struct omap_hwmod *oh, void *data,
 {
 	struct omap_hwmod_addr_space *mem;
 	void __iomem *va_start = NULL;
+	struct resource res;
+	int error;
 
 	if (!oh)
 		return -EINVAL;
@@ -2440,7 +2511,14 @@ static int __init _init_mpu_rt_base(struct omap_hwmod *oh, void *data,
 			return -ENXIO;
 		}
 
-		va_start = of_iomap(np, index + oh->mpu_rt_idx);
+		/* Do we have a dts range for the interconnect target module? */
+		error = omap_hwmod_parse_module_range(oh, np, &res);
+		if (!error)
+			va_start = ioremap(res.start, resource_size(&res));
+
+		/* No ranges, rely on device reg entry */
+		if (!va_start)
+			va_start = of_iomap(np, index + oh->mpu_rt_idx);
 	} else {
 		va_start = ioremap(mem->pa_start, mem->pa_end - mem->pa_start);
 	}