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Commit aee48e3c authored by Paul Walmsley's avatar Paul Walmsley
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OMAP: hwmod: add an hardreset API for use by other core code 



Expose an hardreset API from hwmod in order to assert / deassert all the
individual reset lines that belong to an hwmod.  This API is needed by
some of the more complicated processor drivers, e.g., DSP/Bridge,
Syslink, etc.

Signed-off-by: default avatarPaul Walmsley <paul@pwsan.com>
Cc: Benoît Cousson <b-cousson@ti.com>
parent 76e5589e

arch/arm/mach-omap2/omap_hwmod.c

+78 −0
Original line number Diff line number Diff line
@@ -1828,6 +1828,84 @@ int omap_hwmod_disable_wakeup(struct omap_hwmod *oh) 
	return 0;

}



/**

 * omap_hwmod_assert_hardreset - assert the HW reset line of submodules

 * contained in the hwmod module.

 * @oh: struct omap_hwmod *

 * @name: name of the reset line to lookup and assert

 *

 * Some IP like dsp, ipu or iva contain processor that require

 * an HW reset line to be assert / deassert in order to enable fully

 * the IP.  Returns -EINVAL if @oh is null or if the operation is not

 * yet supported on this OMAP; otherwise, passes along the return value

 * from _assert_hardreset().

 */

int omap_hwmod_assert_hardreset(struct omap_hwmod *oh, const char *name)

{

	int ret;



	if (!oh)

		return -EINVAL;



	mutex_lock(&oh->_mutex);

	ret = _assert_hardreset(oh, name);

	mutex_unlock(&oh->_mutex);



	return ret;

}



/**

 * omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules

 * contained in the hwmod module.

 * @oh: struct omap_hwmod *

 * @name: name of the reset line to look up and deassert

 *

 * Some IP like dsp, ipu or iva contain processor that require

 * an HW reset line to be assert / deassert in order to enable fully

 * the IP.  Returns -EINVAL if @oh is null or if the operation is not

 * yet supported on this OMAP; otherwise, passes along the return value

 * from _deassert_hardreset().

 */

int omap_hwmod_deassert_hardreset(struct omap_hwmod *oh, const char *name)

{

	int ret;



	if (!oh)

		return -EINVAL;



	mutex_lock(&oh->_mutex);

	ret = _deassert_hardreset(oh, name);

	mutex_unlock(&oh->_mutex);



	return ret;

}



/**

 * omap_hwmod_read_hardreset - read the HW reset line state of submodules

 * contained in the hwmod module

 * @oh: struct omap_hwmod *

 * @name: name of the reset line to look up and read

 *

 * Return the current state of the hwmod @oh's reset line named @name:

 * returns -EINVAL upon parameter error or if this operation

 * is unsupported on the current OMAP; otherwise, passes along the return

 * value from _read_hardreset().

 */

int omap_hwmod_read_hardreset(struct omap_hwmod *oh, const char *name)

{

	int ret;



	if (!oh)

		return -EINVAL;



	mutex_lock(&oh->_mutex);

	ret = _read_hardreset(oh, name);

	mutex_unlock(&oh->_mutex);



	return ret;

}





/**

 * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname

 * @classname: struct omap_hwmod_class name to search for

arch/arm/plat-omap/include/plat/omap_hwmod.h

+4 −0
Original line number Diff line number Diff line
@@ -512,6 +512,10 @@ int omap_hwmod_idle(struct omap_hwmod *oh); 
int _omap_hwmod_idle(struct omap_hwmod *oh);

int omap_hwmod_shutdown(struct omap_hwmod *oh);



int omap_hwmod_assert_hardreset(struct omap_hwmod *oh, const char *name);

int omap_hwmod_deassert_hardreset(struct omap_hwmod *oh, const char *name);

int omap_hwmod_read_hardreset(struct omap_hwmod *oh, const char *name);



int omap_hwmod_enable_clocks(struct omap_hwmod *oh);

int omap_hwmod_disable_clocks(struct omap_hwmod *oh);