From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Date: Fri, 15 May 2009 21:47:02 +0000 (+0200)
Subject: arm: timer and interrupt init rework
X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=b54384e3ba6b5535751f317fcd3940a53eed0d3a;p=u-boot.git

arm: timer and interrupt init rework

actually the timer init use the interrupt_init as init callback
which make the interrupt and timer implementation difficult to follow

so now rename it as int timer_init(void) and use interrupt_init for interrupt

btw also remane the corresponding file to the functionnality implemented

as ixp arch implement two timer - one based on interrupt - so all the timer
related code is moved to timer.c

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---

diff --git a/board/armltd/integratorap/integratorap.c b/board/armltd/integratorap/integratorap.c
index 9631967b07..5ececd6495 100644
--- a/board/armltd/integratorap/integratorap.c
+++ b/board/armltd/integratorap/integratorap.c
@@ -540,7 +540,7 @@ static ulong div_timer	 = 1;	/* Divisor to convert timer reading
  * - the Integrator/AP timer issues an interrupt
  *   each time it reaches zero
  */
-int interrupt_init (void)
+int timer_init (void)
 {
 	/* Load timer with initial value */
 	*(volatile ulong *)(CONFIG_SYS_TIMERBASE + 0) = TIMER_LOAD_VAL;
diff --git a/board/armltd/integratorcp/integratorcp.c b/board/armltd/integratorcp/integratorcp.c
index 72629ce2b3..0d3afd8d24 100644
--- a/board/armltd/integratorcp/integratorcp.c
+++ b/board/armltd/integratorcp/integratorcp.c
@@ -163,7 +163,7 @@ static ulong timestamp;		/* U-Boot ticks since startup	      */
 
 /* starts up a counter
  * - the Integrator/CP timer can be set up to issue an interrupt */
-int interrupt_init (void)
+int timer_init (void)
 {
 	/* Load timer with initial value */
 	*(volatile ulong *)(CONFIG_SYS_TIMERBASE + 0) = TIMER_LOAD_VAL;
diff --git a/board/atmel/at91cap9adk/at91cap9adk.c b/board/atmel/at91cap9adk/at91cap9adk.c
index f52edaaa03..9f73df6903 100644
--- a/board/atmel/at91cap9adk/at91cap9adk.c
+++ b/board/atmel/at91cap9adk/at91cap9adk.c
@@ -61,7 +61,6 @@ static void at91cap9_slowclock_hw_init(void)
 	if (at91_sys_read(AT91_PMC_VER) == ARCH_ID_AT91CAP9_REVC) {
 		unsigned i, tmp = at91_sys_read(AT91_SCKCR);
 		if ((tmp & AT91CAP9_SCKCR_OSCSEL) == AT91CAP9_SCKCR_OSCSEL_RC) {
-			extern void timer_init(void);
 			timer_init();
 			tmp |= AT91CAP9_SCKCR_OSC32EN;
 			at91_sys_write(AT91_SCKCR, tmp);
diff --git a/board/davinci/common/misc.h b/board/davinci/common/misc.h
index 4a57dbb89b..5d29784403 100644
--- a/board/davinci/common/misc.h
+++ b/board/davinci/common/misc.h
@@ -22,7 +22,6 @@
 #ifndef __MISC_H
 #define __MISC_H
 
-extern void timer_init(void);
 extern int eth_hw_init(void);
 
 void dv_display_clk_infos(void);
diff --git a/board/m501sk/m501sk.c b/board/m501sk/m501sk.c
index dc5b786c00..1e6a605672 100644
--- a/board/m501sk/m501sk.c
+++ b/board/m501sk/m501sk.c
@@ -127,7 +127,7 @@ int board_init(void)
 	m501sk_gpio_init();
 
 	/* Do interrupt init here, because flash needs timers */
-	interrupt_init();
+	timer_init();
 	flash_init();
 
 	return 0;
diff --git a/board/netstar/netstar.c b/board/netstar/netstar.c
index ee4f2cdca7..ffd60bfae0 100644
--- a/board/netstar/netstar.c
+++ b/board/netstar/netstar.c
@@ -48,7 +48,7 @@ int dram_init(void)
 	/* Take the Ethernet controller out of reset and wait
 	 * for the EEPROM load to complete. */
 	*((volatile unsigned short *) GPIO_DATA_OUTPUT_REG) |= 0x80;
-	udelay(10);	/* doesn't work before interrupt_init call */
+	udelay(10);	/* doesn't work before timer_init call */
 	*((volatile unsigned short *) GPIO_DATA_OUTPUT_REG) &= ~0x80;
 	udelay(500);
 
diff --git a/board/voiceblue/voiceblue.c b/board/voiceblue/voiceblue.c
index c8dde3651e..59b3310ae8 100644
--- a/board/voiceblue/voiceblue.c
+++ b/board/voiceblue/voiceblue.c
@@ -43,7 +43,7 @@ int dram_init(void)
 	/* Take the Ethernet controller out of reset and wait
 	 * for the EEPROM load to complete. */
 	*((volatile unsigned short *) GPIO_DATA_OUTPUT_REG) |= 0x80;
-	udelay(10);	/* doesn't work before interrupt_init call */
+	udelay(10);	/* doesn't work before timer_init call */
 	*((volatile unsigned short *) GPIO_DATA_OUTPUT_REG) &= ~0x80;
 	udelay(500);
 
diff --git a/cpu/arm1136/mx31/Makefile b/cpu/arm1136/mx31/Makefile
index 0e06f0a2b2..1e49e8d80f 100644
--- a/cpu/arm1136/mx31/Makefile
+++ b/cpu/arm1136/mx31/Makefile
@@ -25,7 +25,8 @@ include $(TOPDIR)/config.mk
 
 LIB	= $(obj)lib$(SOC).a
 
-COBJS	= interrupts.o generic.o
+COBJS	+= generic.o
+COBJS	+= timer.o
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
diff --git a/cpu/arm1136/mx31/interrupts.c b/cpu/arm1136/mx31/timer.c
similarity index 97%
rename from cpu/arm1136/mx31/interrupts.c
rename to cpu/arm1136/mx31/timer.c
index ab7202fef2..29b484e448 100644
--- a/cpu/arm1136/mx31/interrupts.c
+++ b/cpu/arm1136/mx31/timer.c
@@ -89,9 +89,8 @@ static inline unsigned long long us_to_tick(unsigned long long us)
 }
 #endif
 
-/* nothing really to do with interrupts, just starts up a counter. */
 /* The 32768Hz 32-bit timer overruns in 131072 seconds */
-int interrupt_init (void)
+int timer_init (void)
 {
 	int i;
 
diff --git a/cpu/arm1136/omap24xx/Makefile b/cpu/arm1136/omap24xx/Makefile
index f9afed72f6..2a79d9bbba 100644
--- a/cpu/arm1136/omap24xx/Makefile
+++ b/cpu/arm1136/omap24xx/Makefile
@@ -25,9 +25,10 @@ include $(TOPDIR)/config.mk
 
 LIB	= $(obj)lib$(SOC).a
 
-COBJS	= interrupts.o
 SOBJS	= start.o
 
+COBJS	= timer.o
+
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
 
diff --git a/cpu/arm1136/omap24xx/interrupts.c b/cpu/arm1136/omap24xx/timer.c
similarity index 97%
rename from cpu/arm1136/omap24xx/interrupts.c
rename to cpu/arm1136/omap24xx/timer.c
index a0c535dae8..8dd8d7b008 100644
--- a/cpu/arm1136/omap24xx/interrupts.c
+++ b/cpu/arm1136/omap24xx/timer.c
@@ -42,8 +42,7 @@
 static ulong timestamp;
 static ulong lastinc;
 
-/* nothing really to do with interrupts, just starts up a counter. */
-int interrupt_init (void)
+int timer_init (void)
 {
 	int32_t val;
 
diff --git a/cpu/arm1176/s3c64xx/Makefile b/cpu/arm1176/s3c64xx/Makefile
index fa4ee3f24e..4656d9a877 100644
--- a/cpu/arm1176/s3c64xx/Makefile
+++ b/cpu/arm1176/s3c64xx/Makefile
@@ -28,8 +28,8 @@ include $(TOPDIR)/config.mk
 
 LIB	= $(obj)lib$(SOC).a
 
-COBJS-y	= interrupts.o
 COBJS-$(CONFIG_S3C6400)	+= cpu_init.o speed.o
+COBJS-y	+= timer.o
 
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS-y))
 
diff --git a/cpu/arm1176/s3c64xx/interrupts.c b/cpu/arm1176/s3c64xx/timer.c
similarity index 99%
rename from cpu/arm1176/s3c64xx/interrupts.c
rename to cpu/arm1176/s3c64xx/timer.c
index 7bb98486c5..22a5b77701 100644
--- a/cpu/arm1176/s3c64xx/interrupts.c
+++ b/cpu/arm1176/s3c64xx/timer.c
@@ -66,7 +66,7 @@ static unsigned long lastdec;
 /* Monotonic incrementing timer */
 static unsigned long long timestamp;
 
-int interrupt_init(void)
+int timer_init(void)
 {
 	s3c64xx_timers *const timers = s3c64xx_get_base_timers();
 
diff --git a/cpu/arm720t/interrupts.c b/cpu/arm720t/interrupts.c
index 39ed345bb7..ff21314d8e 100644
--- a/cpu/arm720t/interrupts.c
+++ b/cpu/arm720t/interrupts.c
@@ -110,9 +110,34 @@ static void timer_isr( void *data) {
 static ulong timestamp;
 static ulong lastdec;
 
+#if defined(CONFIG_USE_IRQ) && defined(CONFIG_S3C4510B)
 int interrupt_init (void)
 {
+	int i;
+
+	/* install default interrupt handlers */
+	for ( i = 0; i < N_IRQS; i++) {
+		IRQ_HANDLER[i].m_data = (void *)i;
+		IRQ_HANDLER[i].m_func = default_isr;
+	}
+
+	/* configure interrupts for IRQ mode */
+	PUT_REG( REG_INTMODE, 0x0);
+	/* clear any pending interrupts */
+	PUT_REG( REG_INTPEND, 0x1FFFFF);
+
+	lastdec = 0;
+
+	/* install interrupt handler for timer */
+	IRQ_HANDLER[INT_TIMER0].m_data = (void *)&timestamp;
+	IRQ_HANDLER[INT_TIMER0].m_func = timer_isr;
+
+	return 0;
+}
+#endif
 
+int timer_init (void)
+{
 #if defined(CONFIG_NETARM)
 	/* disable all interrupts */
 	IRQEN = 0;
@@ -137,25 +162,6 @@ int interrupt_init (void)
 	/* set timer 1 counter */
 	lastdec = IO_TC1D = TIMER_LOAD_VAL;
 #elif defined(CONFIG_S3C4510B)
-	int i;
-
-	/* install default interrupt handlers */
-	for ( i = 0; i < N_IRQS; i++) {
-		IRQ_HANDLER[i].m_data = (void *)i;
-		IRQ_HANDLER[i].m_func = default_isr;
-	}
-
-	/* configure interrupts for IRQ mode */
-	PUT_REG( REG_INTMODE, 0x0);
-	/* clear any pending interrupts */
-	PUT_REG( REG_INTPEND, 0x1FFFFF);
-
-	lastdec = 0;
-
-	/* install interrupt handler for timer */
-	IRQ_HANDLER[INT_TIMER0].m_data = (void *)&timestamp;
-	IRQ_HANDLER[INT_TIMER0].m_func = timer_isr;
-
 	/* configure free running timer 0 */
 	PUT_REG( REG_TMOD, 0x0);
 	/* Stop timer 0 */
@@ -187,7 +193,7 @@ int interrupt_init (void)
 	PUT32(T0TCR, 1);	/* enable timer0 */
 
 #else
-#error No interrupt_init() defined for this CPU type
+#error No timer_init() defined for this CPU type
 #endif
 	timestamp = 0;
 
diff --git a/cpu/arm920t/at91rm9200/Makefile b/cpu/arm920t/at91rm9200/Makefile
index 161ca9492f..73aeeac39d 100644
--- a/cpu/arm920t/at91rm9200/Makefile
+++ b/cpu/arm920t/at91rm9200/Makefile
@@ -31,10 +31,10 @@ COBJS	+= bcm5221.o
 COBJS	+= dm9161.o
 COBJS	+= ether.o
 COBJS	+= i2c.o
-COBJS	+= interrupts.o
 COBJS	+= lxt972.o
 COBJS	+= reset.o
 COBJS	+= spi.o
+COBJS	+= timer.o
 COBJS	+= usb.o
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
diff --git a/cpu/arm920t/at91rm9200/interrupts.c b/cpu/arm920t/at91rm9200/timer.c
similarity index 99%
rename from cpu/arm920t/at91rm9200/interrupts.c
rename to cpu/arm920t/at91rm9200/timer.c
index 4c38a9a0c8..235d107388 100644
--- a/cpu/arm920t/at91rm9200/interrupts.c
+++ b/cpu/arm920t/at91rm9200/timer.c
@@ -45,7 +45,7 @@ AT91PS_TC tmr;
 static ulong timestamp;
 static ulong lastinc;
 
-int interrupt_init (void)
+int timer_init (void)
 {
 	tmr = AT91C_BASE_TC0;
 
diff --git a/cpu/arm920t/imx/Makefile b/cpu/arm920t/imx/Makefile
index d3352deb4b..28945e22cb 100644
--- a/cpu/arm920t/imx/Makefile
+++ b/cpu/arm920t/imx/Makefile
@@ -25,7 +25,9 @@ include $(TOPDIR)/config.mk
 
 LIB	= $(obj)lib$(SOC).a
 
-COBJS	= generic.o interrupts.o speed.o
+COBJS	+= generic.o
+COBJS	+= speed.o
+COBJS	+= timer.o
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
diff --git a/cpu/arm920t/imx/interrupts.c b/cpu/arm920t/imx/timer.c
similarity index 99%
rename from cpu/arm920t/imx/interrupts.c
rename to cpu/arm920t/imx/timer.c
index 1beaf9dcf5..280c682940 100644
--- a/cpu/arm920t/imx/interrupts.c
+++ b/cpu/arm920t/imx/timer.c
@@ -35,7 +35,7 @@
 #include <arm920t.h>
 #include <asm/arch/imx-regs.h>
 
-int interrupt_init (void)
+int timer_init (void)
 {
 	int i;
 	/* setup GP Timer 1 */
diff --git a/cpu/arm920t/ks8695/Makefile b/cpu/arm920t/ks8695/Makefile
index f6b006300b..f53fdc2b25 100644
--- a/cpu/arm920t/ks8695/Makefile
+++ b/cpu/arm920t/ks8695/Makefile
@@ -25,9 +25,10 @@ include $(TOPDIR)/config.mk
 
 LIB	= $(obj)lib$(SOC).a
 
-COBJS	= interrupts.o
 SOBJS	= lowlevel_init.o
 
+COBJS	= timer.o
+
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
 
diff --git a/cpu/arm920t/ks8695/interrupts.c b/cpu/arm920t/ks8695/timer.c
similarity index 93%
rename from cpu/arm920t/ks8695/interrupts.c
rename to cpu/arm920t/ks8695/timer.c
index 883d689ed0..22987bc48b 100644
--- a/cpu/arm920t/ks8695/interrupts.c
+++ b/cpu/arm920t/ks8695/timer.c
@@ -29,13 +29,13 @@
 #define	ks8695_read(a)    *((volatile ulong *) (KS8695_IO_BASE + (a)))
 #define	ks8695_write(a,v) *((volatile ulong *) (KS8695_IO_BASE + (a))) = (v)
 
-int timer_inited;
 ulong timer_ticks;
 
-int interrupt_init (void)
+int timer_init (void)
 {
-	/* nothing happens here - we don't setup any IRQs */
-	return (0);
+	reset_timer();
+
+	return 0;
 }
 
 /*
@@ -53,7 +53,6 @@ void reset_timer_masked(void)
 	ks8695_write(KS8695_TIMER1_PCOUNT, TIMER_PULSE);
 	ks8695_write(KS8695_TIMER_CTRL, 0x2);
 	timer_ticks = 0;
-	timer_inited++;
 }
 
 void reset_timer(void)
@@ -87,9 +86,6 @@ void udelay(ulong usec)
 	ulong start = get_timer_masked();
 	ulong end;
 
-	if (!timer_inited)
-		reset_timer();
-
 	/* Only 1ms resolution :-( */
 	end = usec / 1000;
 	while (get_timer(start) < end)
diff --git a/cpu/arm920t/s3c24x0/Makefile b/cpu/arm920t/s3c24x0/Makefile
index 3afe19ce9c..5d2be2c1b2 100644
--- a/cpu/arm920t/s3c24x0/Makefile
+++ b/cpu/arm920t/s3c24x0/Makefile
@@ -25,7 +25,10 @@ include $(TOPDIR)/config.mk
 
 LIB	= $(obj)lib$(SOC).a
 
-COBJS	= interrupts.o speed.o usb.o usb_ohci.o
+COBJS	+= speed.o
+COBJS	+= timer.o
+COBJS	+= usb.o
+COBJS	+= usb_ohci.o
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
diff --git a/cpu/arm920t/s3c24x0/interrupts.c b/cpu/arm920t/s3c24x0/timer.c
similarity index 99%
rename from cpu/arm920t/s3c24x0/interrupts.c
rename to cpu/arm920t/s3c24x0/timer.c
index b8ce6ae94a..f3c0ed62cc 100644
--- a/cpu/arm920t/s3c24x0/interrupts.c
+++ b/cpu/arm920t/s3c24x0/timer.c
@@ -52,7 +52,7 @@ static inline ulong READ_TIMER(void)
 static ulong timestamp;
 static ulong lastdec;
 
-int interrupt_init (void)
+int timer_init (void)
 {
 	S3C24X0_TIMERS * const timers = S3C24X0_GetBase_TIMERS();
 
diff --git a/cpu/arm925t/Makefile b/cpu/arm925t/Makefile
index 0d4912cd72..8d0e88f902 100644
--- a/cpu/arm925t/Makefile
+++ b/cpu/arm925t/Makefile
@@ -26,7 +26,10 @@ include $(TOPDIR)/config.mk
 LIB	= $(obj)lib$(CPU).a
 
 START	= start.o
-COBJS	= interrupts.o cpu.o omap925.o
+
+COBJS	+= cpu.o
+COBJS	+= omap925.o
+COBJS	+= timer.o
 
 SRCS	:= $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
diff --git a/cpu/arm925t/interrupts.c b/cpu/arm925t/timer.c
similarity index 99%
rename from cpu/arm925t/interrupts.c
rename to cpu/arm925t/timer.c
index 179992debe..c16ef2577f 100644
--- a/cpu/arm925t/interrupts.c
+++ b/cpu/arm925t/timer.c
@@ -47,7 +47,7 @@ static uint32_t timestamp;
 static uint32_t lastdec;
 
 /* nothing really to do with interrupts, just starts up a counter. */
-int interrupt_init (void)
+int timer_init (void)
 {
 	/* Start the decrementer ticking down from 0xffffffff */
 	__raw_writel(TIMER_LOAD_VAL, CONFIG_SYS_TIMERBASE + LOAD_TIM);
diff --git a/cpu/arm926ejs/Makefile b/cpu/arm926ejs/Makefile
index d5ac7d3fd9..7701b03bbe 100644
--- a/cpu/arm926ejs/Makefile
+++ b/cpu/arm926ejs/Makefile
@@ -26,7 +26,7 @@ include $(TOPDIR)/config.mk
 LIB	= $(obj)lib$(CPU).a
 
 START	= start.o
-COBJS	= interrupts.o cpu.o
+COBJS	= cpu.o
 
 SRCS	:= $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS) $(SOBJS))
diff --git a/cpu/arm926ejs/interrupts.c b/cpu/arm926ejs/interrupts.c
deleted file mode 100644
index ce979f3d87..0000000000
--- a/cpu/arm926ejs/interrupts.c
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * (C) Copyright 2003
- * Texas Instruments <www.ti.com>
- *
- * (C) Copyright 2002
- * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
- * Marius Groeger <mgroeger@sysgo.de>
- *
- * (C) Copyright 2002
- * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
- * Alex Zuepke <azu@sysgo.de>
- *
- * (C) Copyright 2002-2004
- * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
- *
- * (C) Copyright 2004
- * Philippe Robin, ARM Ltd. <philippe.robin@arm.com>
- *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
- */
-
-#include <common.h>
-#include <arm926ejs.h>
-
-#ifdef CONFIG_INTEGRATOR
-
-	/* Timer functionality supplied by Integrator board (AP or CP) */
-
-#else
-
-/* nothing really to do with interrupts, just starts up a counter. */
-int interrupt_init (void)
-{
-	extern void timer_init(void);
-
-	timer_init();
-
-	return 0;
-}
-
-#endif /* CONFIG_INTEGRATOR */
diff --git a/cpu/arm_cortexa8/omap3/Makefile b/cpu/arm_cortexa8/omap3/Makefile
index d1e658d57c..edf5cb29a7 100644
--- a/cpu/arm_cortexa8/omap3/Makefile
+++ b/cpu/arm_cortexa8/omap3/Makefile
@@ -32,7 +32,7 @@ COBJS	+= clock.o
 COBJS	+= mem.o
 COBJS	+= syslib.o
 COBJS	+= sys_info.o
-COBJS	+= interrupts.o
+COBJS	+= timer.o
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS) $(SOBJS))
diff --git a/cpu/arm_cortexa8/omap3/interrupts.c b/cpu/arm_cortexa8/omap3/timer.c
similarity index 99%
rename from cpu/arm_cortexa8/omap3/interrupts.c
rename to cpu/arm_cortexa8/omap3/timer.c
index 3fe13fbaaf..05cfe763aa 100644
--- a/cpu/arm_cortexa8/omap3/interrupts.c
+++ b/cpu/arm_cortexa8/omap3/timer.c
@@ -50,7 +50,7 @@ static gptimer_t *timer_base = (gptimer_t *)CONFIG_SYS_TIMERBASE;
 #define TIMER_CLOCK	(V_SCLK / (2 << CONFIG_SYS_PTV))
 #define TIMER_LOAD_VAL	0xffffffff
 
-int interrupt_init(void)
+int timer_init(void)
 {
 	/* start the counter ticking up, reload value on overflow */
 	writel(TIMER_LOAD_VAL, &timer_base->tldr);
diff --git a/cpu/ixp/Makefile b/cpu/ixp/Makefile
index a673cb1b9f..1403c4f390 100644
--- a/cpu/ixp/Makefile
+++ b/cpu/ixp/Makefile
@@ -26,12 +26,10 @@ include $(TOPDIR)/config.mk
 LIB	= $(obj)lib$(CPU).a
 
 START	= start.o
+
 COBJS-y	+= cpu.o
-ifndef CONFIG_USE_IRQ
+COBJS-$(CONFIG_USE_IRQ)	+= interrupts.o
 COBJS-y	+= timer.o
-else
-COBJS-y	+= interrupts.o
-endif
 
 SRCS	:= $(START:.o=.S) $(SOBJS-y:.o=.S) $(COBJS-y:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS-y) $(COBJS-y))
diff --git a/cpu/ixp/interrupts.c b/cpu/ixp/interrupts.c
index ee0129ead3..a05e439fdb 100644
--- a/cpu/ixp/interrupts.c
+++ b/cpu/ixp/interrupts.c
@@ -33,14 +33,6 @@
 #include <asm/arch/ixp425.h>
 #include <asm/proc-armv/ptrace.h>
 
-/*
- * When interrupts are enabled, use timer 2 for time/delay generation...
- */
-
-#define FREQ		66666666
-#define CLOCK_TICK_RATE	(((FREQ / CONFIG_SYS_HZ & ~IXP425_OST_RELOAD_MASK) + 1) * CONFIG_SYS_HZ)
-#define LATCH		((CLOCK_TICK_RATE + CONFIG_SYS_HZ/2) / CONFIG_SYS_HZ)	/* For divider */
-
 struct _irq_handler {
 	void                *m_data;
 	void (*m_func)( void *data);
@@ -48,8 +40,6 @@ struct _irq_handler {
 
 static struct _irq_handler IRQ_HANDLER[N_IRQS];
 
-static volatile ulong timestamp;
-
 static void default_isr(void *data)
 {
 	printf("default_isr():  called for IRQ %d, Interrupt Status=%x PR=%x\n",
@@ -61,33 +51,20 @@ static int next_irq(void)
 	return (((*IXP425_ICIH & 0x000000fc) >> 2) - 1);
 }
 
-static void timer_isr(void *data)
-{
-	unsigned int *pTime = (unsigned int *)data;
-
-	(*pTime)++;
-
-	/*
-	 * Reset IRQ source
-	 */
-	*IXP425_OSST = IXP425_OSST_TIMER_2_PEND;
-}
-
-ulong get_timer (ulong base)
+void do_irq (struct pt_regs *pt_regs)
 {
-	return timestamp - base;
-}
+	int irq = next_irq();
 
-void reset_timer (void)
-{
-	timestamp = 0;
+	IRQ_HANDLER[irq].m_func(IRQ_HANDLER[irq].m_data);
 }
 
-void do_irq (struct pt_regs *pt_regs)
+void irq_install_handler (int irq, interrupt_handler_t handle_irq, void *data)
 {
-	int irq = next_irq();
+	if (irq >= N_IRQS || !handle_irq)
+		return;
 
-	IRQ_HANDLER[irq].m_func(IRQ_HANDLER[irq].m_data);
+	IRQ_HANDLER[irq].m_data = data;
+	IRQ_HANDLER[irq].m_func = handle_irq;
 }
 
 int interrupt_init (void)
@@ -95,23 +72,11 @@ int interrupt_init (void)
 	int i;
 
 	/* install default interrupt handlers */
-	for (i = 0; i < N_IRQS; i++) {
-		IRQ_HANDLER[i].m_data = (void *)i;
-		IRQ_HANDLER[i].m_func = default_isr;
-	}
-
-	/* install interrupt handler for timer */
-	IRQ_HANDLER[IXP425_TIMER_2_IRQ].m_data = (void *)&timestamp;
-	IRQ_HANDLER[IXP425_TIMER_2_IRQ].m_func = timer_isr;
-
-	/* setup the Timer counter value */
-	*IXP425_OSRT2 = (LATCH & ~IXP425_OST_RELOAD_MASK) | IXP425_OST_ENABLE;
+	for (i = 0; i < N_IRQS; i++)
+		irq_install_handler(i, default_isr, (void *)i);
 
 	/* configure interrupts for IRQ mode */
 	*IXP425_ICLR = 0x00000000;
 
-	/* enable timer irq */
-	*IXP425_ICMR = (1 << IXP425_TIMER_2_IRQ);
-
 	return (0);
 }
diff --git a/cpu/ixp/timer.c b/cpu/ixp/timer.c
index deb227a1a6..685614966b 100644
--- a/cpu/ixp/timer.c
+++ b/cpu/ixp/timer.c
@@ -32,6 +32,54 @@
 #include <common.h>
 #include <asm/arch/ixp425.h>
 
+#ifdef CONFIG_TIMER_IRQ
+
+#define FREQ		66666666
+#define CLOCK_TICK_RATE	(((FREQ / CONFIG_SYS_HZ & ~IXP425_OST_RELOAD_MASK) + 1) * CONFIG_SYS_HZ)
+#define LATCH		((CLOCK_TICK_RATE + CONFIG_SYS_HZ/2) / CONFIG_SYS_HZ)	/* For divider */
+
+/*
+ * When interrupts are enabled, use timer 2 for time/delay generation...
+ */
+
+static volatile ulong timestamp;
+
+static void timer_isr(void *data)
+{
+	unsigned int *pTime = (unsigned int *)data;
+
+	(*pTime)++;
+
+	/*
+	 * Reset IRQ source
+	 */
+	*IXP425_OSST = IXP425_OSST_TIMER_2_PEND;
+}
+
+ulong get_timer (ulong base)
+{
+	return timestamp - base;
+}
+
+void reset_timer (void)
+{
+	timestamp = 0;
+}
+
+int timer_init (void)
+{
+	/* install interrupt handler for timer */
+	irq_install_handler(IXP425_TIMER_2_IRQ, timer_isr, (void *)&timestamp);
+
+	/* setup the Timer counter value */
+	*IXP425_OSRT2 = (LATCH & ~IXP425_OST_RELOAD_MASK) | IXP425_OST_ENABLE;
+
+	/* enable timer irq */
+	*IXP425_ICMR = (1 << IXP425_TIMER_2_IRQ);
+
+	return 0;
+}
+#else
 ulong get_timer (ulong base)
 {
        return get_timer_masked () - base;
@@ -79,3 +127,9 @@ ulong get_timer_masked (void)
 	}
 	return (reload_constant - current);
 }
+
+int timer_init(void)
+{
+	return 0;
+}
+#endif
diff --git a/cpu/lh7a40x/Makefile b/cpu/lh7a40x/Makefile
index bac2a640cb..b9ae76effa 100644
--- a/cpu/lh7a40x/Makefile
+++ b/cpu/lh7a40x/Makefile
@@ -26,7 +26,7 @@ include $(TOPDIR)/config.mk
 LIB	= $(obj)lib$(CPU).a
 
 START	= start.o
-COBJS	= cpu.o speed.o interrupts.o serial.o
+COBJS	= cpu.o speed.o serial.o timer.o
 
 SRCS	:= $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
diff --git a/cpu/lh7a40x/interrupts.c b/cpu/lh7a40x/timer.c
similarity index 99%
rename from cpu/lh7a40x/interrupts.c
rename to cpu/lh7a40x/timer.c
index d39e707775..f0baf14737 100644
--- a/cpu/lh7a40x/interrupts.c
+++ b/cpu/lh7a40x/timer.c
@@ -47,7 +47,7 @@ static inline ulong READ_TIMER(void)
 static ulong timestamp;
 static ulong lastdec;
 
-int interrupt_init (void)
+int timer_init (void)
 {
 	lh7a40x_timers_t* timers = LH7A40X_TIMERS_PTR;
 	lh7a40x_timer_t* timer = &timers->timer1;
diff --git a/cpu/pxa/Makefile b/cpu/pxa/Makefile
index 42903b2ea4..5dc3a52c8d 100644
--- a/cpu/pxa/Makefile
+++ b/cpu/pxa/Makefile
@@ -26,7 +26,13 @@ include $(TOPDIR)/config.mk
 LIB	= $(obj)lib$(CPU).a
 
 START	= start.o
-COBJS	= serial.o interrupts.o cpu.o i2c.o pxafb.o usb.o
+
+COBJS	+= cpu.o
+COBJS	+= i2c.o
+COBJS	+= pxafb.o
+COBJS	+= serial.o
+COBJS	+= timer.o
+COBJS	+= usb.o
 
 SRCS	:= $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
diff --git a/cpu/pxa/interrupts.c b/cpu/pxa/timer.c
similarity index 96%
rename from cpu/pxa/interrupts.c
rename to cpu/pxa/timer.c
index 2bc5c50a91..e2df3a57fc 100644
--- a/cpu/pxa/interrupts.c
+++ b/cpu/pxa/timer.c
@@ -56,10 +56,11 @@ static inline unsigned long long us_to_tick(unsigned long long us)
 	return us;
 }
 
-int interrupt_init (void)
+int timer_init (void)
 {
-	/* nothing happens here - we don't setup any IRQs */
-	return (0);
+	reset_timer();
+
+	return 0;
 }
 
 void reset_timer (void)
diff --git a/cpu/s3c44b0/Makefile b/cpu/s3c44b0/Makefile
index ae909a699f..6da2016f66 100644
--- a/cpu/s3c44b0/Makefile
+++ b/cpu/s3c44b0/Makefile
@@ -26,7 +26,10 @@ include $(TOPDIR)/config.mk
 LIB	= $(obj)lib$(CPU).a
 
 START	= start.o
-COBJS	= cache.o cpu.o interrupts.o
+
+COBJS	+= cache.o
+COBJS	+= cpu.o
+COBJS	+= timer.o
 
 SRCS	:= $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
diff --git a/cpu/s3c44b0/interrupts.c b/cpu/s3c44b0/timer.c
similarity index 98%
rename from cpu/s3c44b0/interrupts.c
rename to cpu/s3c44b0/timer.c
index eb23e6ab11..34184abb73 100644
--- a/cpu/s3c44b0/interrupts.c
+++ b/cpu/s3c44b0/timer.c
@@ -40,7 +40,7 @@
 static ulong timestamp;
 static ulong lastdec;
 
-int interrupt_init (void)
+int timer_init (void)
 {
 	TCFG0 = 0x000000E9;
 	TCFG1 = 0x00000004;
diff --git a/cpu/sa1100/Makefile b/cpu/sa1100/Makefile
index fd696f7efb..28b668267c 100644
--- a/cpu/sa1100/Makefile
+++ b/cpu/sa1100/Makefile
@@ -26,7 +26,9 @@ include $(TOPDIR)/config.mk
 LIB	= $(obj)lib$(CPU).a
 
 START	= start.o
-COBJS	= interrupts.o cpu.o
+
+COBJS	+= cpu.o
+COBJS	+= timer.o
 
 SRCS	:= $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
diff --git a/cpu/sa1100/interrupts.c b/cpu/sa1100/timer.c
similarity index 95%
rename from cpu/sa1100/interrupts.c
rename to cpu/sa1100/timer.c
index 2eff045709..3f77e815cb 100644
--- a/cpu/sa1100/interrupts.c
+++ b/cpu/sa1100/timer.c
@@ -29,10 +29,9 @@
 #include <common.h>
 #include <SA-1100.h>
 
-int interrupt_init (void)
+int timer_init (void)
 {
-	/* nothing happens here - we don't setup any IRQs */
-	return (0);
+	return 0;
 }
 
 void reset_timer (void)
diff --git a/include/asm-arm/u-boot-arm.h b/include/asm-arm/u-boot-arm.h
index e7d58fe8cd..238d408541 100644
--- a/include/asm-arm/u-boot-arm.h
+++ b/include/asm-arm/u-boot-arm.h
@@ -62,4 +62,7 @@ void	reset_timer_masked	(void);
 ulong	get_timer_masked	(void);
 void	udelay_masked		(unsigned long usec);
 
+/* cpu/.../timer.c */
+int	timer_init		(void);
+
 #endif	/* _U_BOOT_ARM_H_ */
diff --git a/include/configs/ixdpg425.h b/include/configs/ixdpg425.h
index 75707e597d..0c092347ca 100644
--- a/include/configs/ixdpg425.h
+++ b/include/configs/ixdpg425.h
@@ -55,6 +55,7 @@
  */
 #undef CONFIG_USE_IRQ			/* we don't need IRQ/FIQ stuff	*/
 #define CONFIG_USE_IRQ          1	/* we need IRQ stuff for timer	*/
+#define CONFIG_TIMER_IRQ
 
 #define CONFIG_BOOTCOUNT_LIMIT		/* support for bootcount limit	*/
 #define CONFIG_SYS_BOOTCOUNT_ADDR	0x60003000 /* inside qmrg sram		*/
diff --git a/include/configs/pdnb3.h b/include/configs/pdnb3.h
index edaa81b59b..1255f21e8b 100644
--- a/include/configs/pdnb3.h
+++ b/include/configs/pdnb3.h
@@ -51,6 +51,7 @@
  * Misc configuration options
  */
 #define CONFIG_USE_IRQ          1	/* we need IRQ stuff for timer	*/
+#define CONFIG_TIMER_IRQ
 
 #define CONFIG_BOOTCOUNT_LIMIT		/* support for bootcount limit	*/
 #define CONFIG_SYS_BOOTCOUNT_ADDR	0x60003000 /* inside qmrg sram		*/
diff --git a/lib_arm/board.c b/lib_arm/board.c
index e3040acdc6..c7768e5289 100644
--- a/lib_arm/board.c
+++ b/lib_arm/board.c
@@ -266,7 +266,10 @@ init_fnc_t *init_sequence[] = {
 	arch_cpu_init,		/* basic arch cpu dependent setup */
 #endif
 	board_init,		/* basic board dependent setup */
+#if defined(CONFIG_USE_IRQ)
 	interrupt_init,		/* set up exceptions */
+#endif
+	timer_init,		/* initialize timer */
 	env_init,		/* initialize environment */
 	init_baudrate,		/* initialze baudrate settings */
 	serial_init,		/* serial communications setup */