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authorSantosh Shilimkar <santosh.shilimkar@ti.com>2013-01-21 18:40:57 +0530
committerBenoit Cousson <benoit.cousson@linaro.org>2013-04-09 00:21:21 +0200
commit079abade857e7ba7877a84536fbf5da5fa665d70 (patch)
tree897b9af9f1b143738f9605b80da4284198bcc938 /arch/arm/mach-omap2/omap_hwmod.c
parent55452197ce43a8de500507e88eeae2f0c3520649 (diff)
ARM: OMAP2+: hwmod: extract module address space from DT blob
Patch adds the code for extracting the module ocp address space from device tree blob in case the hwmod address space look up fails. The idea is to remove the address space data from hwmod and extract it from DT blob. Signed-off-by: Rajendra Nayak <rnayak@ti.com> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Signed-off-by: Benoit Cousson <benoit.cousson@linaro.org>
Diffstat (limited to 'arch/arm/mach-omap2/omap_hwmod.c')
-rw-r--r--arch/arm/mach-omap2/omap_hwmod.c45
1 files changed, 42 insertions, 3 deletions
diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
index e5cafed8ef2..ff729706c5a 100644
--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -138,6 +138,8 @@
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/bootmem.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
#include <asm/system_misc.h>
@@ -2346,6 +2348,34 @@ static int _shutdown(struct omap_hwmod *oh)
}
/**
+ * of_dev_hwmod_lookup - look up needed hwmod from dt blob
+ * @np: struct device_node *
+ * @oh: struct omap_hwmod *
+ *
+ * Parse the dt blob and find out needed hwmod. Recursive function is
+ * implemented to take care hierarchical dt blob parsing.
+ * Return: The device node on success or NULL on failure.
+ */
+static struct device_node *of_dev_hwmod_lookup(struct device_node *np,
+ struct omap_hwmod *oh)
+{
+ struct device_node *np0 = NULL, *np1 = NULL;
+ const char *p;
+
+ for_each_child_of_node(np, np0) {
+ if (of_find_property(np0, "ti,hwmods", NULL)) {
+ p = of_get_property(np0, "ti,hwmods", NULL);
+ if (!strcmp(p, oh->name))
+ return np0;
+ np1 = of_dev_hwmod_lookup(np0, oh);
+ if (np1)
+ return np1;
+ }
+ }
+ return NULL;
+}
+
+/**
* _init_mpu_rt_base - populate the virtual address for a hwmod
* @oh: struct omap_hwmod * to locate the virtual address
*
@@ -2357,7 +2387,8 @@ static int _shutdown(struct omap_hwmod *oh)
static void __init _init_mpu_rt_base(struct omap_hwmod *oh, void *data)
{
struct omap_hwmod_addr_space *mem;
- void __iomem *va_start;
+ void __iomem *va_start = NULL;
+ struct device_node *np;
if (!oh)
return;
@@ -2371,10 +2402,18 @@ static void __init _init_mpu_rt_base(struct omap_hwmod *oh, void *data)
if (!mem) {
pr_debug("omap_hwmod: %s: no MPU register target found\n",
oh->name);
- return;
+
+ /* Extract the IO space from device tree blob */
+ if (!of_have_populated_dt())
+ return;
+
+ np = of_dev_hwmod_lookup(of_find_node_by_name(NULL, "ocp"), oh);
+ if (np)
+ va_start = of_iomap(np, 0);
+ } else {
+ va_start = ioremap(mem->pa_start, mem->pa_end - mem->pa_start);
}
- va_start = ioremap(mem->pa_start, mem->pa_end - mem->pa_start);
if (!va_start) {
pr_err("omap_hwmod: %s: Could not ioremap\n", oh->name);
return;