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OMAP: hwmod: separate list locking and hwmod hardware locking
Currently omap_hwmod_mutex is being used to protect both the list access/modification and concurrent access to hwmod functions. This patch separates these two types of locking. First, omap_hwmod_mutex is used only to protect access and modification of omap_hwmod_list. Also cleaned up some comments referring to this mutex that are no longer needed. Then, for protecting concurrent access to hwmod functions, use a per-hwmod mutex. This protects concurrent access to a single hwmod, but would allow concurrent access to different hwmods. Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com> [paul@pwsan.com: added structure documentation; changed mutex variable name] Signed-off-by: Paul Walmsley <paul@pwsan.com>
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@ -767,10 +767,10 @@ static struct omap_hwmod *_lookup(const char *name)
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* @data: not used; pass NULL
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*
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* Called by omap_hwmod_late_init() (after omap2_clk_init()).
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* Resolves all clock names embedded in the hwmod. Must be called
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* with omap_hwmod_mutex held. Returns -EINVAL if the omap_hwmod
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* has not yet been registered or if the clocks have already been
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* initialized, 0 on success, or a non-zero error on failure.
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* Resolves all clock names embedded in the hwmod. Returns -EINVAL if
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* the omap_hwmod has not yet been registered or if the clocks have
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* already been initialized, 0 on success, or a non-zero error on
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* failure.
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*/
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static int _init_clocks(struct omap_hwmod *oh, void *data)
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{
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@ -838,10 +838,9 @@ static int _wait_target_ready(struct omap_hwmod *oh)
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* @oh: struct omap_hwmod *
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*
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* Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
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* enabled for this to work. Must be called with omap_hwmod_mutex
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* held. Returns -EINVAL if the hwmod cannot be reset this way or if
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* the hwmod is in the wrong state, -ETIMEDOUT if the module did not
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* reset in time, or 0 upon success.
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* enabled for this to work. Returns -EINVAL if the hwmod cannot be
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* reset this way or if the hwmod is in the wrong state, -ETIMEDOUT if
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* the module did not reset in time, or 0 upon success.
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*/
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static int _reset(struct omap_hwmod *oh)
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{
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@ -891,9 +890,8 @@ static int _reset(struct omap_hwmod *oh)
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* @oh: struct omap_hwmod *
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*
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* Enables an omap_hwmod @oh such that the MPU can access the hwmod's
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* register target. Must be called with omap_hwmod_mutex held.
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* Returns -EINVAL if the hwmod is in the wrong state or passes along
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* the return value of _wait_target_ready().
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* register target. Returns -EINVAL if the hwmod is in the wrong
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* state or passes along the return value of _wait_target_ready().
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*/
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int _omap_hwmod_enable(struct omap_hwmod *oh)
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{
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@ -1004,11 +1002,10 @@ static int _shutdown(struct omap_hwmod *oh)
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* @skip_setup_idle_p: do not idle hwmods at the end of the fn if 1
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*
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* Writes the CLOCKACTIVITY bits @clockact to the hwmod @oh
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* OCP_SYSCONFIG register. Must be called with omap_hwmod_mutex held.
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* @skip_setup_idle is intended to be used on a system that will not
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* call omap_hwmod_enable() to enable devices (e.g., a system without
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* PM runtime). Returns -EINVAL if the hwmod is in the wrong state or
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* returns 0.
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* OCP_SYSCONFIG register. @skip_setup_idle is intended to be used on
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* a system that will not call omap_hwmod_enable() to enable devices
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* (e.g., a system without PM runtime). Returns -EINVAL if the hwmod
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* is in the wrong state or returns 0.
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*/
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static int _setup(struct omap_hwmod *oh, void *data)
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{
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@ -1038,6 +1035,7 @@ static int _setup(struct omap_hwmod *oh, void *data)
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}
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}
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mutex_init(&oh->_mutex);
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oh->_state = _HWMOD_STATE_INITIALIZED;
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r = _omap_hwmod_enable(oh);
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@ -1323,9 +1321,9 @@ int omap_hwmod_enable(struct omap_hwmod *oh)
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if (!oh)
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return -EINVAL;
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mutex_lock(&omap_hwmod_mutex);
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mutex_lock(&oh->_mutex);
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r = _omap_hwmod_enable(oh);
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mutex_unlock(&omap_hwmod_mutex);
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mutex_unlock(&oh->_mutex);
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return r;
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}
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@ -1343,9 +1341,9 @@ int omap_hwmod_idle(struct omap_hwmod *oh)
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if (!oh)
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return -EINVAL;
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mutex_lock(&omap_hwmod_mutex);
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mutex_lock(&oh->_mutex);
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_omap_hwmod_idle(oh);
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mutex_unlock(&omap_hwmod_mutex);
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mutex_unlock(&oh->_mutex);
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return 0;
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}
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@ -1363,9 +1361,9 @@ int omap_hwmod_shutdown(struct omap_hwmod *oh)
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if (!oh)
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return -EINVAL;
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mutex_lock(&omap_hwmod_mutex);
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mutex_lock(&oh->_mutex);
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_shutdown(oh);
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mutex_unlock(&omap_hwmod_mutex);
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mutex_unlock(&oh->_mutex);
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return 0;
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}
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@ -1378,9 +1376,9 @@ int omap_hwmod_shutdown(struct omap_hwmod *oh)
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*/
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int omap_hwmod_enable_clocks(struct omap_hwmod *oh)
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{
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mutex_lock(&omap_hwmod_mutex);
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mutex_lock(&oh->_mutex);
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_enable_clocks(oh);
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mutex_unlock(&omap_hwmod_mutex);
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mutex_unlock(&oh->_mutex);
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return 0;
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}
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@ -1393,9 +1391,9 @@ int omap_hwmod_enable_clocks(struct omap_hwmod *oh)
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*/
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int omap_hwmod_disable_clocks(struct omap_hwmod *oh)
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{
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mutex_lock(&omap_hwmod_mutex);
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mutex_lock(&oh->_mutex);
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_disable_clocks(oh);
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mutex_unlock(&omap_hwmod_mutex);
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mutex_unlock(&oh->_mutex);
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return 0;
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}
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@ -1443,9 +1441,9 @@ int omap_hwmod_reset(struct omap_hwmod *oh)
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if (!oh)
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return -EINVAL;
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mutex_lock(&omap_hwmod_mutex);
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mutex_lock(&oh->_mutex);
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r = _reset(oh);
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mutex_unlock(&omap_hwmod_mutex);
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mutex_unlock(&oh->_mutex);
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return r;
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}
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@ -1646,9 +1644,9 @@ int omap_hwmod_enable_wakeup(struct omap_hwmod *oh)
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!(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP))
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return -EINVAL;
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mutex_lock(&omap_hwmod_mutex);
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mutex_lock(&oh->_mutex);
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_enable_wakeup(oh);
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mutex_unlock(&omap_hwmod_mutex);
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mutex_unlock(&oh->_mutex);
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return 0;
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}
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@ -1671,9 +1669,9 @@ int omap_hwmod_disable_wakeup(struct omap_hwmod *oh)
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!(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP))
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return -EINVAL;
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mutex_lock(&omap_hwmod_mutex);
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mutex_lock(&oh->_mutex);
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_disable_wakeup(oh);
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mutex_unlock(&omap_hwmod_mutex);
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mutex_unlock(&oh->_mutex);
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return 0;
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}
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@ -35,6 +35,7 @@
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/ioport.h>
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#include <linux/mutex.h>
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#include <plat/cpu.h>
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struct omap_device;
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@ -433,6 +434,7 @@ struct omap_hwmod_class {
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* @_state: internal-use hwmod state
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* @flags: hwmod flags (documented below)
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* @omap_chip: OMAP chips this hwmod is present on
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* @_mutex: mutex serializing operations on this hwmod
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* @node: list node for hwmod list (internal use)
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*
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* @main_clk refers to this module's "main clock," which for our
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@ -461,6 +463,7 @@ struct omap_hwmod {
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void *dev_attr;
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u32 _sysc_cache;
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void __iomem *_mpu_rt_va;
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struct mutex _mutex;
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struct list_head node;
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u16 flags;
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u8 _mpu_port_index;
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