implement io based udelay function for all mainboards that lack an apic

timer (or just failed otherwise due to missing udelay)


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2131 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

src/config/Options.lb

@@ -784,6 +784,11 @@ define CONFIG_UDELAY_TSC
 	export used
 	comment "Implement udelay with the x86 time stamp counter"
 end
+define CONFIG_UDELAY_IO
+	default 0
+	export used
+	comment "Implement udelay with x86 io registers"
+end
 define FAKE_SPDROM
 	default 0
 	export always

src/mainboard/densitron/dpx114/Options.lb

@@ -31,6 +31,7 @@ uses CROSS_COMPILE
 uses CC
 uses HOSTCC
 uses OBJCOPY
+uses CONFIG_UDELAY_IO
 
 ## ROM_SIZE is the size of boot ROM that this board will use.
 default ROM_SIZE  = 256*1024
@@ -54,6 +55,11 @@ default HAVE_MP_TABLE=0
 ##
 default HAVE_HARD_RESET=1
 
+##
+## use io based udelay function
+##
+default CONFIG_UDELAY_IO=1
+
 ##
 ## Build code to export a programmable irq routing table
 ##

src/mainboard/digitallogic/adl855pc/Options.lb

@@ -6,6 +6,7 @@ uses HAVE_HARD_RESET
 uses HAVE_OPTION_TABLE
 uses USE_OPTION_TABLE
 uses CONFIG_ROM_STREAM
+uses CONFIG_UDELAY_IO
 uses IRQ_SLOT_COUNT
 uses MAINBOARD
 uses MAINBOARD_VENDOR
@@ -58,6 +59,11 @@ default HAVE_MP_TABLE=0
 ##
 default HAVE_HARD_RESET=1
 
+##
+## use io based udelay function
+##
+default CONFIG_UDELAY_IO=1
+
 ##
 ## Build code to export a programmable irq routing table
 ##

src/mainboard/via/epia/Options.lb

@@ -10,6 +10,7 @@ uses HAVE_PIRQ_TABLE
 uses USE_FALLBACK_IMAGE
 uses HAVE_FALLBACK_BOOT
 uses HAVE_HARD_RESET
+uses CONFIG_UDELAY_IO
 uses HAVE_OPTION_TABLE
 uses USE_OPTION_TABLE
 uses CONFIG_ROM_STREAM
@@ -81,6 +82,11 @@ default HAVE_MP_TABLE=0
 ##
 default HAVE_HARD_RESET=1
 
+##
+## use io based udelay function
+##
+default CONFIG_UDELAY_IO=1
+
 ##
 ## Build code to export a programmable irq routing table
 ##

src/pc80/Config.lb

@@ -1,11 +1,16 @@
 uses CONFIG_IDE
 uses CONFIG_CONSOLE_VGA
+uses CONFIG_UDELAY_IO
 
 object mc146818rtc.o
 object isa-dma.o
 object i8259.o 
 #object udelay_timer2.o CONFIG_UDELAY_TIMER2
 
+if CONFIG_UDELAY_IO
+	object udelay_io.o
+end
+
 if CONFIG_IDE
 	dir ide
 end

src/pc80/udelay_io.c

@@ -0,0 +1,9 @@
+#include <arch/io.h>
+
+void udelay(int usecs)
+{
+	int i;
+	for(i = 0; i < usecs; i++)
+		outb(i&0xff, 0x80);
+}
+