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OMAP2+: hwmod: add ability to setup individual hwmods

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Add omap_hwmod_setup_one(), which is intended for use early in boot to
selectively setup the hwmods needed for system clocksources and
clockevents, and any other hwmod that is needed in early boot.
omap_hwmod_setup_all() can then be called later in the boot process.
The point is to minimize the amount of code that needs to be run
early.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Benoît Cousson <b-cousson@ti.com>
Cc: Kevin Hilman <khilman@ti.com>
Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Paul Walmsley 2011-02-23 00:14:07 -07:00
parent 48d54f3fd2
commit a2debdbd1a
2 changed files with 58 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
arch/arm/mach-omap2/omap_hwmod.c
View File

@ -901,7 +901,7 @@ static struct omap_hwmod *_lookup(const char *name)
* @oh: struct omap_hwmod *
* @data: not used; pass NULL
*
* Called by omap_hwmod_setup_all() (after omap2_clk_init()).
* Called by omap_hwmod_setup_*() (after omap2_clk_init()).
* Resolves all clock names embedded in the hwmod. Returns 0 on
* success, or a negative error code on failure.
*/
@ -1616,7 +1616,7 @@ int __init omap_hwmod_register(struct omap_hwmod **ohs)
/*
* _populate_mpu_rt_base - populate the virtual address for a hwmod
*
* Must be called only from omap_hwmod_setup_all() so ioremap works properly.
* Must be called only from omap_hwmod_setup_*() so ioremap works properly.
* Assumes the caller takes care of locking if needed.
*/
static int __init _populate_mpu_rt_base(struct omap_hwmod *oh, void *data)
@ -1635,12 +1635,60 @@ static int __init _populate_mpu_rt_base(struct omap_hwmod *oh, void *data)
return 0;
}
/**
* omap_hwmod_setup_one - set up a single hwmod
* @oh_name: const char * name of the already-registered hwmod to set up
*
* Must be called after omap2_clk_init(). Resolves the struct clk
* names to struct clk pointers for each registered omap_hwmod. Also
* calls _setup() on each hwmod. Returns -EINVAL upon error or 0 upon
* success.
*/
int __init omap_hwmod_setup_one(const char *oh_name)
{
struct omap_hwmod *oh;
int r;
pr_debug("omap_hwmod: %s: %s\n", oh_name, __func__);
if (!mpu_oh) {
pr_err("omap_hwmod: %s: cannot setup_one: MPU initiator hwmod %s not yet registered\n",
oh_name, MPU_INITIATOR_NAME);
return -EINVAL;
}
oh = _lookup(oh_name);
if (!oh) {
WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name);
return -EINVAL;
}
if (mpu_oh->_state == _HWMOD_STATE_REGISTERED && oh != mpu_oh)
omap_hwmod_setup_one(MPU_INITIATOR_NAME);
r = _populate_mpu_rt_base(oh, NULL);
if (IS_ERR_VALUE(r)) {
WARN(1, "omap_hwmod: %s: couldn't set mpu_rt_base\n", oh_name);
return -EINVAL;
}
r = _init_clocks(oh, NULL);
if (IS_ERR_VALUE(r)) {
WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh_name);
return -EINVAL;
}
_setup(oh, NULL);
return 0;
}
/**
* omap_hwmod_setup - do some post-clock framework initialization
*
* Must be called after omap2_clk_init(). Resolves the struct clk names
* to struct clk pointers for each registered omap_hwmod. Also calls
* _setup() on each hwmod. Returns 0 upon success or -EINVAL upon error.
* _setup() on each hwmod. Returns 0 upon success.
*/
static int __init omap_hwmod_setup_all(void)
{
@ -1654,9 +1702,9 @@ static int __init omap_hwmod_setup_all(void)
r = omap_hwmod_for_each(_populate_mpu_rt_base, NULL);
/* XXX check return value */
r = omap_hwmod_for_each(_init_clocks, NULL);
WARN(r, "omap_hwmod: %s: _init_clocks failed\n", __func__);
WARN(IS_ERR_VALUE(r),
"omap_hwmod: %s: _init_clocks failed\n", __func__);
omap_hwmod_for_each(_setup, NULL);
@ -2182,8 +2230,8 @@ int omap_hwmod_for_each_by_class(const char *classname,
* @state: state that _setup() should leave the hwmod in
*
* Sets the hwmod state that @oh will enter at the end of _setup()
* (called by omap_hwmod_setup_all()). Only valid to call between
* calling omap_hwmod_register() and omap_hwmod_setup_all(). Returns
* (called by omap_hwmod_setup_*()). Only valid to call between
* calling omap_hwmod_register() and omap_hwmod_setup_*(). Returns
* 0 upon success or -EINVAL if there is a problem with the arguments
* or if the hwmod is in the wrong state.
*/

3
arch/arm/plat-omap/include/plat/omap_hwmod.h
View File

@ -30,6 +30,7 @@
#define __ARCH_ARM_PLAT_OMAP_INCLUDE_MACH_OMAP_HWMOD_H
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/ioport.h>
#include <linux/spinlock.h>
@ -542,6 +543,8 @@ struct omap_hwmod *omap_hwmod_lookup(const char *name);
int omap_hwmod_for_each(int (*fn)(struct omap_hwmod *oh, void *data),
void *data);
int __init omap_hwmod_setup_one(const char *name);
int omap_hwmod_enable(struct omap_hwmod *oh);
int _omap_hwmod_enable(struct omap_hwmod *oh);
int omap_hwmod_idle(struct omap_hwmod *oh);