Commit 079abade authored by Santosh Shilimkar's avatar Santosh Shilimkar Committed by Benoit Cousson
Browse files

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: default avatarRajendra Nayak <>
Signed-off-by: default avatarSantosh Shilimkar <>
Signed-off-by: default avatarBenoit Cousson <>
parent 55452197
......@@ -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>
......@@ -2345,6 +2347,34 @@ static int _shutdown(struct omap_hwmod *oh)
return 0;
* 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)
......@@ -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",
/* Extract the IO space from device tree blob */
if (!of_have_populated_dt())
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);
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment