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

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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>
This commit is contained in:
Paul Walmsley
2012-10-21 01:01:13 -06:00
parent b5c5353d41
commit 2bb2a5d30a
11 changed files with 308 additions and 6 deletions
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10
arch/arm/mach-omap2/prm-regbits-34xx.h
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@@ -509,15 +509,25 @@
#define OMAP3430_RSTTIME1_MASK (0xff << 0)
/* PRM_RSTST */
#define OMAP3430_ICECRUSHER_RST_SHIFT 10
#define OMAP3430_ICECRUSHER_RST_MASK (1 << 10)
#define OMAP3430_ICEPICK_RST_SHIFT 9
#define OMAP3430_ICEPICK_RST_MASK (1 << 9)
#define OMAP3430_VDD2_VOLTAGE_MANAGER_RST_SHIFT 8
#define OMAP3430_VDD2_VOLTAGE_MANAGER_RST_MASK (1 << 8)
#define OMAP3430_VDD1_VOLTAGE_MANAGER_RST_SHIFT 7
#define OMAP3430_VDD1_VOLTAGE_MANAGER_RST_MASK (1 << 7)
#define OMAP3430_EXTERNAL_WARM_RST_SHIFT 6
#define OMAP3430_EXTERNAL_WARM_RST_MASK (1 << 6)
#define OMAP3430_SECURE_WD_RST_SHIFT 5
#define OMAP3430_SECURE_WD_RST_MASK (1 << 5)
#define OMAP3430_MPU_WD_RST_SHIFT 4
#define OMAP3430_MPU_WD_RST_MASK (1 << 4)
#define OMAP3430_SECURITY_VIOL_RST_SHIFT 3
#define OMAP3430_SECURITY_VIOL_RST_MASK (1 << 3)
#define OMAP3430_GLOBAL_SW_RST_SHIFT 1
#define OMAP3430_GLOBAL_SW_RST_MASK (1 << 1)
#define OMAP3430_GLOBAL_COLD_RST_SHIFT 0
#define OMAP3430_GLOBAL_COLD_RST_MASK (1 << 0)
/* PRM_VOLTCTRL */