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OMAP2+: hwmod: allow custom pre-shutdown functions

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Some OMAP IP blocks, such as the watchdog timers, cannot be completely
shut down via the standard hwmod shutdown mechanism.  This patch
enables the hwmod data files to supply a pointer to a custom
pre-shutdown function via the struct omap_hwmod_class.pre_shutdown
function pointer.  If the struct omap_hwmod_class.pre_shutdown
function pointer is non-null, the function will be executed before the
existing hwmod shutdown code runs.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Benoît Cousson <b-cousson@ti.com>
This commit is contained in:
Paul Walmsley 2010-12-14 12:42:34 -07:00
parent 4805734bcc
commit e4dc8f507c
2 changed files with 25 additions and 0 deletions
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15
arch/arm/mach-omap2/omap_hwmod.c
View File

@ -1261,6 +1261,9 @@ int _omap_hwmod_idle(struct omap_hwmod *oh)
*/
static int _shutdown(struct omap_hwmod *oh)
{
int ret;
u8 prev_state;
if (oh->_state != _HWMOD_STATE_IDLE &&
oh->_state != _HWMOD_STATE_ENABLED) {
WARN(1, "omap_hwmod: %s: disabled state can only be entered "
@ -1270,6 +1273,18 @@ static int _shutdown(struct omap_hwmod *oh)
pr_debug("omap_hwmod: %s: disabling\n", oh->name);
if (oh->class->pre_shutdown) {
prev_state = oh->_state;
if (oh->_state == _HWMOD_STATE_IDLE)
_omap_hwmod_enable(oh);
ret = oh->class->pre_shutdown(oh);
if (ret) {
if (prev_state == _HWMOD_STATE_IDLE)
_omap_hwmod_idle(oh);
return ret;
}
}
if (oh->class->sysc)
_shutdown_sysc(oh);

10
arch/arm/plat-omap/include/plat/omap_hwmod.h
View File

@ -415,14 +415,24 @@ struct omap_hwmod_omap4_prcm {
* @name: name of the hwmod_class
* @sysc: device SYSCONFIG/SYSSTATUS register data
* @rev: revision of the IP class
* @pre_shutdown: ptr to fn to be executed immediately prior to device shutdown
*
* Represent the class of a OMAP hardware "modules" (e.g. timer,
* smartreflex, gpio, uart...)
*
* @pre_shutdown is a function that will be run immediately before
* hwmod clocks are disabled, etc. It is intended for use for hwmods
* like the MPU watchdog, which cannot be disabled with the standard
* omap_hwmod_shutdown(). The function should return 0 upon success,
* or some negative error upon failure. Returning an error will cause
* omap_hwmod_shutdown() to abort the device shutdown and return an
* error.
*/
struct omap_hwmod_class {
const char *name;
struct omap_hwmod_class_sysconfig *sysc;
u32 rev;
int (*pre_shutdown)(struct omap_hwmod *oh);
};
/**