ARM: OMAP2+: hwmod: add parent_hwmod support

Add parent_hwmod pointer to omap_hwmod. This can be set to point to a
"parent" hwmod that needs to be enabled for the "child" hwmod to work.

This is used at hwmod setup time: when doing the initial setup and
reset, first enable the parent hwmod, and after setup and reset is done,
restore the parent hwmod to postsetup_state.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Archit Taneja <archit.taneja@gmail.com>
[paul@pwsan.com: add kerneldoc documentation for parent_hwmod; note that it
 is a temporary workaround]
Signed-off-by: Paul Walmsley <paul@pwsan.com>

2 files changed, 30 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
index acae6d5d1151..a2c7b300fe89 100644
--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -2719,11 +2719,33 @@ static int __init _setup(struct omap_hwmod *oh, void *data)
         if (oh->_state != _HWMOD_STATE_INITIALIZED)
                 return 0;
 
+        if (oh->parent_hwmod) {
+                int r;
+
+                r = _enable(oh->parent_hwmod);
+                WARN(r, "hwmod: %s: setup: failed to enable parent hwmod %s\n",
+                     oh->name, oh->parent_hwmod->name);
+        }
+
         _setup_iclk_autoidle(oh);
 
         if (!_setup_reset(oh))
                 _setup_postsetup(oh);
 
+        if (oh->parent_hwmod) {
+                u8 postsetup_state;
+
+                postsetup_state = oh->parent_hwmod->_postsetup_state;
+
+                if (postsetup_state == _HWMOD_STATE_IDLE)
+                        _idle(oh->parent_hwmod);
+                else if (postsetup_state == _HWMOD_STATE_DISABLED)
+                        _shutdown(oh->parent_hwmod);
+                else if (postsetup_state != _HWMOD_STATE_ENABLED)
+                        WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
+                             oh->parent_hwmod->name, postsetup_state);
+        }
+
         return 0;
 }
 
diff --git a/arch/arm/mach-omap2/omap_hwmod.h b/arch/arm/mach-omap2/omap_hwmod.h
index 512f809a3f4d..35ca6efbec31 100644
--- a/arch/arm/mach-omap2/omap_hwmod.h
+++ b/arch/arm/mach-omap2/omap_hwmod.h
@@ -633,6 +633,7 @@ struct omap_hwmod_link {
  * @flags: hwmod flags (documented below)
  * @_lock: spinlock serializing operations on this hwmod
  * @node: list node for hwmod list (internal use)
+ * @parent_hwmod: (temporary) a pointer to the hierarchical parent of this hwmod
  *
  * @main_clk refers to this module's "main clock," which for our
  * purposes is defined as "the functional clock needed for register
@@ -643,6 +644,12 @@ struct omap_hwmod_link {
  * the omap_hwmod code and should not be set during initialization.
  *
  * @masters and @slaves are now deprecated.
+ *
+ * @parent_hwmod is temporary; there should be no need for it, as this
+ * information should already be expressed in the OCP interface
+ * structures.  @parent_hwmod is present as a workaround until we improve
+ * handling for hwmods with multiple parents (e.g., OMAP4+ DSS with
+ * multiple register targets across different interconnects).
  */
 struct omap_hwmod {
         const char                      *name;
@@ -680,6 +687,7 @@ struct omap_hwmod {
         u8                              _int_flags;
         u8                              _state;
         u8                              _postsetup_state;
+        struct omap_hwmod               *parent_hwmod;
 };
 
 struct omap_hwmod *omap_hwmod_lookup(const char *name);