OMAP2+: hwmod: add API to handle autoidle mode

[~andy/linux] / arch / arm / mach-omap2 / omap_hwmod.c

diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
index 816aeb97ba288fcf83cad2a2f8d2c6c3a27b69e6..a68a2cf1be34b68c13fac0283f795e5ccedbdc4f 100644 (file)
--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -1287,6 +1287,42 @@ static int _idle(struct omap_hwmod *oh)
        return 0;
 }
 
+/**
+ * omap_hwmod_set_ocp_autoidle - set the hwmod's OCP autoidle bit
+ * @oh: struct omap_hwmod *
+ * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
+ *
+ * Sets the IP block's OCP autoidle bit in hardware, and updates our
+ * local copy. Intended to be used by drivers that require
+ * direct manipulation of the AUTOIDLE bits.
+ * Returns -EINVAL if @oh is null or is not in the ENABLED state, or passes
+ * along the return value from _set_module_autoidle().
+ *
+ * Any users of this function should be scrutinized carefully.
+ */
+int omap_hwmod_set_ocp_autoidle(struct omap_hwmod *oh, u8 autoidle)
+{
+       u32 v;
+       int retval = 0;
+       unsigned long flags;
+
+       if (!oh || oh->_state != _HWMOD_STATE_ENABLED)
+               return -EINVAL;
+
+       spin_lock_irqsave(&oh->_lock, flags);
+
+       v = oh->_sysc_cache;
+
+       retval = _set_module_autoidle(oh, autoidle, &v);
+
+       if (!retval)
+               _write_sysconfig(v, oh);
+
+       spin_unlock_irqrestore(&oh->_lock, flags);
+
+       return retval;
+}
+
 /**
  * _shutdown - shutdown an omap_hwmod
  * @oh: struct omap_hwmod *