ARM: OMAP2+: PRM: create PRM reset source API for the watchdog timer driver

The OMAP watchdog timer driver needs to determine what caused the SoC
to reset for its GETBOOTSTATUS ioctl.  So, define a set of standard
reset sources across OMAP SoCs.  For OMAP2xxx, 3xxx, and 4xxx SoCs,
define mappings from the SoC-specific reset source register bits to
the standardized reset source IDs.  Create SoC-specific PRM functions
that read the appropriate per-SoC register and use the mapping to
return the standardized reset bits.  Register the SoC-specific PRM
functions with the common PRM code via prm_register().  Create a
function in the common PRM code, prm_read_reset_sources(), that
calls the SoC-specific function, registered during boot.

This patch does not yet handle some SoCs, such as AM33xx.  Those SoCs
were not handled by the code this will replace.

Signed-off-by: Paul Walmsley <paul@pwsan.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/prm-regbits-24xx.h b/arch/arm/mach-omap2/prm-regbits-24xx.h
index bd70a5a04291..638da6dd41c3 100644
--- a/arch/arm/mach-omap2/prm-regbits-24xx.h
+++ b/arch/arm/mach-omap2/prm-regbits-24xx.h
@@ -209,9 +209,13 @@
 
 /* RM_RSTST_WKUP specific bits */
 /* 2430 calls EXTWMPU_RST "EXTWARM_RST" and GLOBALWMPU_RST "GLOBALWARM_RST" */
+#define OMAP24XX_EXTWMPU_RST_SHIFT                      6
 #define OMAP24XX_EXTWMPU_RST_MASK                       (1 << 6)
+#define OMAP24XX_SECU_WD_RST_SHIFT                      5
 #define OMAP24XX_SECU_WD_RST_MASK                       (1 << 5)
+#define OMAP24XX_MPU_WD_RST_SHIFT                       4
 #define OMAP24XX_MPU_WD_RST_MASK                        (1 << 4)
+#define OMAP24XX_SECU_VIOL_RST_SHIFT                    3
 #define OMAP24XX_SECU_VIOL_RST_MASK                     (1 << 3)
 
 /* PM_WKEN_WKUP specific bits */