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Commit aaf2c0fb authored by Lokesh Vutla's avatar Lokesh Vutla Committed by Paul Walmsley
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ARM: OMAP2+: hwmod: add support for lock and unlock hooks 



Some IP blocks like RTC, needs an additional setting for writing to its
registers. This is to prevent any spurious writes from changing the
register values.

This patch adds optional lock and unlock function pointers to
the IP block's hwmod data. These unlock and lock function pointers
are called by hwmod code before and after writing sysconfig registers.

Signed-off-by: default avatarLokesh Vutla <lokeshvutla@ti.com>
[paul@pwsan.com: fixed indentation level to conform with the rest of the
 structure members]
Reviewed-by: default avatarPaul Walmsley <paul@pwsan.com>
Signed-off-by: default avatarPaul Walmsley <paul@pwsan.com>
parent b9e23f32

arch/arm/mach-omap2/omap_hwmod.c

+13 −0
Original line number Diff line number Diff line
@@ -299,7 +299,20 @@ static void _write_sysconfig(u32 v, struct omap_hwmod *oh) 


	/* Module might have lost context, always update cache and register */

	oh->_sysc_cache = v;



	/*

	 * Some IP blocks (such as RTC) require unlocking of IP before

	 * accessing its registers. If a function pointer is present

	 * to unlock, then call it before accessing sysconfig and

	 * call lock after writing sysconfig.

	 */

	if (oh->class->unlock)

		oh->class->unlock(oh);



	omap_hwmod_write(v, oh, oh->class->sysc->sysc_offs);



	if (oh->class->lock)

		oh->class->lock(oh);

}



/**

arch/arm/mach-omap2/omap_hwmod.h

+4 −0
Original line number Diff line number Diff line
@@ -576,6 +576,8 @@ struct omap_hwmod_omap4_prcm { 
 * @pre_shutdown: ptr to fn to be executed immediately prior to device shutdown

 * @reset: ptr to fn to be executed in place of the standard hwmod reset fn

 * @enable_preprogram:  ptr to fn to be executed during device enable

 * @lock: ptr to fn to be executed to lock IP registers

 * @unlock: ptr to fn to be executed to unlock IP registers

 *

 * Represent the class of a OMAP hardware "modules" (e.g. timer,

 * smartreflex, gpio, uart...)
@@ -600,6 +602,8 @@ struct omap_hwmod_class { 
	int					(*pre_shutdown)(struct omap_hwmod *oh);

	int					(*reset)(struct omap_hwmod *oh);

	int					(*enable_preprogram)(struct omap_hwmod *oh);

	void					(*lock)(struct omap_hwmod *oh);

	void					(*unlock)(struct omap_hwmod *oh);

};



/**