Enable or disable the power button in Kconfig

Some mainboards need to disable the power button to avoid turning off
right after being turned on, while other boards ship with a jumper over
the power button and should allow the user to configure the behavior.

This adds infrastructure in the form of four mutually exclusive options
which can be selected in a mainboard Kconfig (power button forced on/off,
and user-controllable with default on/off) and one result bool which
source code can test. (Enable the button or not.)

The options have been implemented in CS5536 code and for all mainboards
which select SOUTHBRIDGE_AMD_CS5536, but should be used also by other
chipsets where applicable. Note that if chipset code uses the result
bool ENABLE_POWER_BUTTON, then every board using that chipset must
select one out of the four control options in order to build.

All touched boards should have unchanged behavior, except
pcengines/alix1c, traverse/geos and lippert/hurricane-lx where the
power button can now be configured by the user.

Build tested for alix1c, alix2d, hurricane-lx and wyse-s50. Confirmed
to work as advertised on alix1c both with button enabled and disabled.

Includes additional traverse/geos changes from Nathan and
lippert/hurricane-lx changes from Jens to correctly use the new
feature on those boards.

Signed-off-by: Peter Stuge <peter@stuge.se>
Acked-by: Aurelien Guillaume <aurelien@iwi.me>
Acked-by: Nils Jacobs <njacobs8@hetnet.nl>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5948 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

5 files changed, 13 insertions, 8 deletions

diff --git a/src/mainboard/lippert/hurricane-lx/Kconfig b/src/mainboard/lippert/hurricane-lx/Kconfig
index 027988f959..9b20aa0759 100644
--- a/src/mainboard/lippert/hurricane-lx/Kconfig
+++ b/src/mainboard/lippert/hurricane-lx/Kconfig
@@ -29,11 +29,20 @@ config IRQ_SLOT_COUNT
 config BOARD_OLD_REVISION
 	bool "Board is old pre-3.0 revision"
 	default n
+	select POWER_BUTTON_DEFAULT_DISABLE
 	help
 	  Look on the bottom side for a number like 406-0001-30.  The last 2
 	  digits state the PCB revision (3.0 in this example).  For 2.0 or older
 	  boards choose Y, for 3.0 and newer say N.
 
+	  Old revision boards need a jumper shorting the power button to
+	  power on automatically.  You may enable the button only after this
+	  jumper has been removed.  New revision boards are not restricted
+	  in this way, and always have the power button enabled.
+
+config POWER_BUTTON_FORCE_ENABLE
+	def_bool y if !BOARD_OLD_REVISION
+
 config ONBOARD_UARTS_RS485
 	bool "Switch on-board serial ports to RS485"
 	default n
diff --git a/src/mainboard/lippert/hurricane-lx/romstage.c b/src/mainboard/lippert/hurricane-lx/romstage.c
index 018f353fd0..b7314bf06f 100644
--- a/src/mainboard/lippert/hurricane-lx/romstage.c
+++ b/src/mainboard/lippert/hurricane-lx/romstage.c
@@ -147,14 +147,7 @@ void main(unsigned long bist)
 
 	cpuRegInit(0, DIMM0, DIMM1, DRAM_TERMINATED);
 
-#if CONFIG_BOARD_OLD_REVISION
-	/*
-	 * Old revision boards need a jumper shorting the power button to power
-	 * on automatically. So we must disable the button's fail-safe function,
-	 * or the board will shut down after 4 s.
-	 */
-	outl(0, PMS_IO_BASE + PM_FSD); // Fail-Save Delay register
-#else
+#if !CONFIG_BOARD_OLD_REVISION
 	int err;
 	/* bit0 = Spread Spectrum */
 	if ((err = smc_send_config(SMC_CONFIG))) {
diff --git a/src/mainboard/lippert/literunner-lx/Kconfig b/src/mainboard/lippert/literunner-lx/Kconfig
index 482f571e8d..7b45d36ea1 100644
--- a/src/mainboard/lippert/literunner-lx/Kconfig
+++ b/src/mainboard/lippert/literunner-lx/Kconfig
@@ -14,6 +14,7 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	# Board is equipped with a 1 MB SPI flash, however, due to limitations
 	# of the IT8712F Super I/O, only the top 512 KB are directly mapped.
 	select BOARD_ROMSIZE_KB_512
+	select POWER_BUTTON_FORCE_ENABLE
 
 config MAINBOARD_DIR
 	string
diff --git a/src/mainboard/lippert/roadrunner-lx/Kconfig b/src/mainboard/lippert/roadrunner-lx/Kconfig
index 44326d193f..4e29742b81 100644
--- a/src/mainboard/lippert/roadrunner-lx/Kconfig
+++ b/src/mainboard/lippert/roadrunner-lx/Kconfig
@@ -13,6 +13,7 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	# Standard chip is a 512 KB FWH. Replacing it with a 1 MB
 	# SST 49LF008A is possible.
 	select BOARD_ROMSIZE_KB_512
+	select POWER_BUTTON_FORCE_ENABLE
 
 config MAINBOARD_DIR
 	string
diff --git a/src/mainboard/lippert/spacerunner-lx/Kconfig b/src/mainboard/lippert/spacerunner-lx/Kconfig
index 7526d1ecb4..f273d6cf56 100644
--- a/src/mainboard/lippert/spacerunner-lx/Kconfig
+++ b/src/mainboard/lippert/spacerunner-lx/Kconfig
@@ -14,6 +14,7 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	# Board is equipped with a 1 MB SPI flash, however, due to limitations
 	# of the IT8712F Super I/O, only the top 512 KB are directly mapped.
 	select BOARD_ROMSIZE_KB_512
+	select POWER_BUTTON_FORCE_ENABLE
 
 config MAINBOARD_DIR
 	string