From 2bb2a5d30abb0dc99d074877bfad2056142c730b Mon Sep 17 00:00:00 2001 From: Paul Walmsley Date: Sun, 21 Oct 2012 01:01:13 -0600 Subject: 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 --- arch/arm/mach-omap2/prm_common.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) (limited to 'arch/arm/mach-omap2/prm_common.c') diff --git a/arch/arm/mach-omap2/prm_common.c b/arch/arm/mach-omap2/prm_common.c index 8670a3c4bc5e..e200e4fb47dc 100644 --- a/arch/arm/mach-omap2/prm_common.c +++ b/arch/arm/mach-omap2/prm_common.c @@ -28,6 +28,8 @@ #include #include "prm2xxx_3xxx.h" +#include "prm2xxx.h" +#include "prm3xxx.h" #include "prm44xx.h" /* @@ -326,6 +328,30 @@ err: return -ENOMEM; } +/** + * prm_read_reset_sources - return the sources of the SoC's last reset + * + * Return a u32 bitmask representing the reset sources that caused the + * SoC to reset. The low-level per-SoC functions called by this + * function remap the SoC-specific reset source bits into an + * OMAP-common set of reset source bits, defined in + * arch/arm/mach-omap2/prm.h. Returns the standardized reset source + * u32 bitmask from the hardware upon success, or returns (1 << + * OMAP_UNKNOWN_RST_SRC_ID_SHIFT) if no low-level read_reset_sources() + * function was registered. + */ +u32 prm_read_reset_sources(void) +{ + u32 ret = 1 << OMAP_UNKNOWN_RST_SRC_ID_SHIFT; + + if (prm_ll_data->read_reset_sources) + ret = prm_ll_data->read_reset_sources(); + else + WARN_ONCE(1, "prm: %s: no mapping function defined for reset sources\n", __func__); + + return ret; +} + /** * prm_register - register per-SoC low-level data with the PRM * @pld: low-level per-SoC OMAP PRM data & function pointers to register -- cgit v1.2.3