OMAP3 hwmod: Add automatic OCP_SYSCONFIG AUTOIDLE handling

This patch fills in the OCP_SYSCONFIG.AUTOIDLE handling in the OMAP
hwmod code.

After this patch, the hwmod code will set the module AUTOIDLE bit
(generally <module>.OCP_SYSCONFIG.AUTOIDLE) to 1 by default upon
enable.  If the hwmod flag HWMOD_NO_OCP_AUTOIDLE is set, AUTOIDLE will
be set to 0 upon enable.  Upon module disable, AUTOIDLE will be set to
1.

Enabling module autoidle should save some power.  The only reason to
not set the OCP_SYSCONFIG.AUTOIDLE bit is if there is a bug in the
module RTL, e.g., the MPUINTC block on OMAP3.

Comments from Kevin Hilman <khilman@deeprootsystems.com> inspired this patch,
and Kevin tested an earlier version of this patch.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Tested-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/arch/arm/plat-omap/include/plat/omap_hwmod.h b/arch/arm/plat-omap/include/plat/omap_hwmod.h
index dbdd123eca16..643a9727de35 100644
--- a/arch/arm/plat-omap/include/plat/omap_hwmod.h
+++ b/arch/arm/plat-omap/include/plat/omap_hwmod.h
@@ -50,6 +50,8 @@ struct omap_device;
 #define SYSC_ENAWAKEUP_MASK             (1 << SYSC_ENAWAKEUP_SHIFT)
 #define SYSC_SOFTRESET_SHIFT            1
 #define SYSC_SOFTRESET_MASK             (1 << SYSC_SOFTRESET_SHIFT)
+#define SYSC_AUTOIDLE_SHIFT             0
+#define SYSC_AUTOIDLE_MASK              (1 << SYSC_AUTOIDLE_SHIFT)
 
 /* OCP SYSSTATUS bit shifts/masks */
 #define SYSS_RESETDONE_SHIFT            0
@@ -294,13 +296,17 @@ struct omap_hwmod_omap4_prcm {
  *     SDRAM controller, etc.
  * HWMOD_INIT_NO_IDLE: don't idle this module at boot - important for SDRAM
  *     controller, etc.
+ * HWMOD_NO_AUTOIDLE: disable module autoidle (OCP_SYSCONFIG.AUTOIDLE)
+ *     when module is enabled, rather than the default, which is to
+ *     enable autoidle
  * HWMOD_SET_DEFAULT_CLOCKACT: program CLOCKACTIVITY bits at startup
  */
 #define HWMOD_SWSUP_SIDLE                       (1 << 0)
 #define HWMOD_SWSUP_MSTANDBY                    (1 << 1)
 #define HWMOD_INIT_NO_RESET                     (1 << 2)
 #define HWMOD_INIT_NO_IDLE                      (1 << 3)
-#define HWMOD_SET_DEFAULT_CLOCKACT              (1 << 4)
+#define HWMOD_NO_OCP_AUTOIDLE                   (1 << 4)
+#define HWMOD_SET_DEFAULT_CLOCKACT              (1 << 5)
 
 /*
  * omap_hwmod._int_flags definitions