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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: Paul Walmsley <paul@pwsan.com>
Cc: Benoît Cousson <b-cousson@ti.com>
This commit is contained in:
Paul Walmsley 2010-09-21 10:34:11 -06:00
parent 76e5589e5b
commit aee48e3c9c
2 changed files with 82 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

78
arch/arm/mach-omap2/omap_hwmod.c
View File

@ -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

4
arch/arm/plat-omap/include/plat/omap_hwmod.h
View File

@ -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);