arm: clean cache management

unify arm cache management except for non standard cache as ARM7TDMI

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

38 files changed, 300 insertions, 623 deletions

diff --git a/board/armltd/integratorap/split_by_variant.sh b/board/armltd/integratorap/split_by_variant.sh
index 51dc53f1bd..2c9fe2e519 100755
--- a/board/armltd/integratorap/split_by_variant.sh
+++ b/board/armltd/integratorap/split_by_variant.sh
@@ -84,8 +84,8 @@ else
 	esac
 fi
 
-if [ "$cpu" = "arm_intcm" ]
-then
+case "$cpu" in
+	arm_intcm)
 	echo "/* Core module undefined/not ported */"	>> tmp.fil
 	echo "#define CONFIG_ARM_INTCM 1"		>> tmp.fil
 	echo -n	"#undef CONFIG_CM_MULTIPLE_SSRAM"	>> tmp.fil
@@ -102,7 +102,19 @@ then
 	echo	"initialization reg */"			>> tmp.fil
 	echo -n	"#undef CONFIG_CM_TCRAM	"		>> tmp.fil
 	echo	" /* CM may not have TCRAM */"		>> tmp.fil
-fi
+	echo -n	" /* May not be processor "		>> tmp.fil
+	echo	"without cache support */"		>> tmp.fil
+	echo	"#define CONFIG_SYS_NO_ICACHE 1"	>> tmp.fil
+	echo	"#define CONFIG_SYS_NO_DCACHE 1"	>> tmp.fil
+	;;
+
+	arm720t)
+	echo -n	" /* May not be processor "		>> tmp.fil
+	echo	"without cache support */"		>> tmp.fil
+	echo	"#define CONFIG_SYS_NO_ICACHE 1"	>> tmp.fil
+	echo	"#define CONFIG_SYS_NO_DCACHE 1"	>> tmp.fil
+	;;
+esac
 
 mkdir -p ${obj}include
 mkdir -p ${obj}board/armltd/integratorap
diff --git a/cpu/arm1136/cpu.c b/cpu/arm1136/cpu.c
index 0abe307bb2..78f6e928f9 100644
--- a/cpu/arm1136/cpu.c
+++ b/cpu/arm1136/cpu.c
@@ -39,13 +39,7 @@
 DECLARE_GLOBAL_DATA_PTR;
 #endif
 
-static void cp_delay (void)
-{
-	volatile int i;
-
-	/* Many OMAP regs need at least 2 nops  */
-	for (i = 0; i < 100; i++);
-}
+static void cache_flush(void);
 
 int cpu_init (void)
 {
@@ -68,8 +62,6 @@ int cleanup_before_linux (void)
 	 * we turn off caches etc ...
 	 */
 
-	unsigned long i;
-
 	disable_interrupts ();
 
 #ifdef CONFIG_LCD
@@ -83,15 +75,12 @@ int cleanup_before_linux (void)
 #endif
 
 	/* turn off I/D-cache */
-	asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
-	i &= ~(CR_C | CR_I);
-	asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
-
+	icache_disable();
+	dcache_disable();
 	/* flush I/D-cache */
-	i = 0;
-	asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i));  /* invalidate both caches and flush btb */
-	asm ("mcr p15, 0, %0, c7, c10, 4": :"r" (i)); /* mem barrier to sync things */
-	return(0);
+	cache_flush();
+
+	return 0;
 }
 
 int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
@@ -102,25 +91,10 @@ int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	return(0);
 }
 
-void icache_enable (void)
+static void cache_flush(void)
 {
-	ulong reg;
+	unsigned long i = 0;
 
-	reg = get_cr ();	/* get control reg. */
-	cp_delay ();
-	set_cr (reg | CR_I);
-}
-
-void icache_disable (void)
-{
-	ulong reg;
-
-	reg = get_cr ();
-	cp_delay ();
-	set_cr (reg & ~CR_I);
-}
-
-int icache_status (void)
-{
-	return(get_cr () & CR_I) != 0;
+	asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i));  /* invalidate both caches and flush btb */
+	asm ("mcr p15, 0, %0, c7, c10, 4": :"r" (i)); /* mem barrier to sync things */
 }
diff --git a/cpu/arm1176/cpu.c b/cpu/arm1176/cpu.c
index ef78bd965e..8aefbe37c8 100644
--- a/cpu/arm1176/cpu.c
+++ b/cpu/arm1176/cpu.c
@@ -38,15 +38,6 @@
 
 static void cache_flush (void);
 
-static void cp_delay (void)
-{
-	volatile int i;
-
-	/* Many OMAP regs need at least 2 nops  */
-	for (i = 0; i < 100; i++)
-		__asm__ __volatile__("nop\n");
-}
-
 int cpu_init (void)
 {
 	return 0;
@@ -66,6 +57,7 @@ int cleanup_before_linux (void)
 	/* turn off I/D-cache */
 	icache_disable();
 	dcache_disable();
+	/* flush I/D-cache */
 	cache_flush();
 
 	return 0;
@@ -95,53 +87,6 @@ int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	return 0;
 }
 
-void icache_enable (void)
-{
-	ulong reg;
-
-	reg = get_cr ();	/* get control reg. */
-	cp_delay ();
-	set_cr (reg | CR_I);
-}
-
-void icache_disable (void)
-{
-	ulong reg;
-
-	reg = get_cr ();
-	cp_delay ();
-	set_cr (reg & ~CR_I);
-}
-
-int icache_status (void)
-{
-	return (get_cr () & CR_I) != 0;
-}
-
-/* It makes no sense to use the dcache if the MMU is not enabled */
-void dcache_enable (void)
-{
-	ulong reg;
-
-	reg = get_cr ();
-	cp_delay ();
-	set_cr (reg | CR_C);
-}
-
-void dcache_disable (void)
-{
-	ulong reg;
-
-	reg = get_cr ();
-	cp_delay ();
-	set_cr (reg & ~CR_C);
-}
-
-int dcache_status (void)
-{
-	return (get_cr () & CR_C) != 0;
-}
-
 /* flush I/D-cache */
 static void cache_flush (void)
 {
diff --git a/cpu/arm720t/cpu.c b/cpu/arm720t/cpu.c
index d178e4140b..a6f5c4d8bb 100644
--- a/cpu/arm720t/cpu.c
+++ b/cpu/arm720t/cpu.c
@@ -36,6 +36,10 @@
 #include <asm/hardware.h>
 #include <asm/system.h>
 
+#if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_ARMADILLO)
+static void cache_flush(void);
+#endif
+
 int cpu_init (void)
 {
 	/*
@@ -59,17 +63,14 @@ int cleanup_before_linux (void)
 	 */
 
 #if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_ARMADILLO)
-	unsigned long i;
-
 	disable_interrupts ();
 
 	/* turn off I-cache */
-	asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
-	i &= ~0x1000;
-	asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
+	icache_disable();
+	dcache_disable();
 
 	/* flush I-cache */
-	asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
+	cache_flush();
 #ifdef CONFIG_ARM7_REVD
 	/* go to high speed */
 	IO_SYSCON3 = (IO_SYSCON3 & ~CLKCTL) | CLKCTL_73;
@@ -93,64 +94,13 @@ int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	return (0);
 }
 
-/*
- * Instruction and Data cache enable and disable functions
- *
- */
-
-#if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_NETARM) || defined(CONFIG_ARMADILLO)
-static void cp_delay (void)
-{
-	volatile int i;
-
-	/* copro seems to need some delay between reading and writing */
-	for (i = 0; i < 100; i++);
-}
-
-void icache_enable (void)
-{
-	ulong reg;
-
-	reg = get_cr ();
-	cp_delay ();
-	set_cr (reg | CR_C);
-}
-
-void icache_disable (void)
-{
-	ulong reg;
-
-	reg = get_cr ();
-	cp_delay ();
-	set_cr (reg & ~CR_C);
-}
-
-int icache_status (void)
-{
-	return (get_cr () & CR_C) != 0;
-}
-
-void dcache_enable (void)
-{
-	ulong reg;
-
-	reg = get_cr ();
-	cp_delay ();
-	set_cr (reg | CR_C);
-}
-
-void dcache_disable (void)
+#if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_ARMADILLO)
+/* flush I/D-cache */
+static void cache_flush (void)
 {
-	ulong reg;
+	unsigned long i = 0;
 
-	reg = get_cr ();
-	cp_delay ();
-	set_cr (reg & ~CR_C);
-}
-
-int dcache_status (void)
-{
-	return (get_cr () & CR_C) != 0;
+	asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
 }
 #elif defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR)
 	/* No specific cache setup for IntegratorAP/CM720T as yet */
diff --git a/cpu/arm920t/cpu.c b/cpu/arm920t/cpu.c
index 83ee3f37f2..08c9339a35 100644
--- a/cpu/arm920t/cpu.c
+++ b/cpu/arm920t/cpu.c
@@ -38,13 +38,7 @@
 DECLARE_GLOBAL_DATA_PTR;
 #endif
 
-static void cp_delay (void)
-{
-	volatile int i;
-
-	/* copro seems to need some delay between reading and writing */
-	for (i = 0; i < 100; i++);
-}
+static void cache_flush(void);
 
 int cpu_init (void)
 {
@@ -67,20 +61,15 @@ int cleanup_before_linux (void)
 	 * we turn off caches etc ...
 	 */
 
-	unsigned long i;
-
 	disable_interrupts ();
 
 	/* turn off I/D-cache */
-	asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
-	i &= ~(CR_C | CR_I);
-	asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
-
+	icache_disable();
+	dcache_disable();
 	/* flush I/D-cache */
-	i = 0;
-	asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i));
+	cache_flush();
 
-	return (0);
+	return 0;
 }
 
 int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
@@ -88,55 +77,13 @@ int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	disable_interrupts ();
 	reset_cpu (0);
 	/*NOTREACHED*/
-	return (0);
-}
-
-void icache_enable (void)
-{
-	ulong reg;
-
-	reg = get_cr ();		/* get control reg. */
-	cp_delay ();
-	set_cr (reg | CR_I);
-}
-
-void icache_disable (void)
-{
-	ulong reg;
-
-	reg = get_cr ();
-	cp_delay ();
-	set_cr (reg & ~CR_I);
-}
-
-int icache_status (void)
-{
-	return (get_cr () & CR_I) != 0;
-}
-
-#ifdef USE_920T_MMU
-/* It makes no sense to use the dcache if the MMU is not enabled */
-void dcache_enable (void)
-{
-	ulong reg;
-
-	reg = get_cr ();
-	cp_delay ();
-	set_cr (reg | CR_C);
+	return 0;
 }
 
-void dcache_disable (void)
+/* flush I/D-cache */
+static void cache_flush (void)
 {
-	ulong reg;
-
-	reg = get_cr ();
-	cp_delay ();
-	reg &= ~CR_C;
-	set_cr (reg);
-}
+	unsigned long i = 0;
 
-int dcache_status (void)
-{
-	return (get_cr () & CR_C) != 0;
+	asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i));
 }
-#endif
diff --git a/cpu/arm925t/cpu.c b/cpu/arm925t/cpu.c
index 8d1b562dca..eb6364d694 100644
--- a/cpu/arm925t/cpu.c
+++ b/cpu/arm925t/cpu.c
@@ -38,13 +38,7 @@
 DECLARE_GLOBAL_DATA_PTR;
 #endif
 
-static void cp_delay (void)
-{
-	volatile int i;
-
-	/* Many OMAP regs need at least 2 nops  */
-	for (i = 0; i < 100; i++);
-}
+static void cache_flush(void);
 
 int cpu_init (void)
 {
@@ -67,19 +61,16 @@ int cleanup_before_linux (void)
 	 * we turn off caches etc ...
 	 */
 
-	unsigned long i;
-
 	disable_interrupts ();
 
-	/* turn off I/D-cache */
-	asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
-	i &= ~(CR_C | CR_I);
-	asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
 
+	/* turn off I/D-cache */
+	icache_disable();
+	dcache_disable();
 	/* flush I/D-cache */
-	i = 0;
-	asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i));
-	return (0);
+	cache_flush();
+
+	return 0;
 }
 
 int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
@@ -90,25 +81,11 @@ int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	return (0);
 }
 
-void icache_enable (void)
-{
-	ulong reg;
-
-	reg = get_cr ();		/* get control reg. */
-	cp_delay ();
-	set_cr (reg | CR_I);
-}
-
-void icache_disable (void)
+/* flush I/D-cache */
+static void cache_flush (void)
 {
-	ulong reg;
+	unsigned long i = 0;
 
-	reg = get_cr ();
-	cp_delay ();
-	set_cr (reg & ~CR_I);
+	asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i));
 }
 
-int icache_status (void)
-{
-	return (get_cr () & CR_I) != 0;
-}
diff --git a/cpu/arm926ejs/cpu.c b/cpu/arm926ejs/cpu.c
index d1748c9c6d..84c169e9b1 100644
--- a/cpu/arm926ejs/cpu.c
+++ b/cpu/arm926ejs/cpu.c
@@ -38,13 +38,7 @@
 DECLARE_GLOBAL_DATA_PTR;
 #endif
 
-static void cp_delay (void)
-{
-	volatile int i;
-
-	/* copro seems to need some delay between reading and writing */
-	for (i = 0; i < 100; i++);
-}
+static void cache_flush(void);
 
 int cpu_init (void)
 {
@@ -67,20 +61,16 @@ int cleanup_before_linux (void)
 	 * we turn off caches etc ...
 	 */
 
-	unsigned long i;
-
 	disable_interrupts ();
 
-	/* turn off I/D-cache */
-	asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
-	i &= ~(CR_C | CR_I);
-	asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
 
+	/* turn off I/D-cache */
+	icache_disable();
+	dcache_disable();
 	/* flush I/D-cache */
-	i = 0;
-	asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i));
+	cache_flush();
 
-	return (0);
+	return 0;
 }
 
 int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
@@ -91,52 +81,10 @@ int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	return (0);
 }
 
-/* cache_bit must be either CR_I or CR_C */
-static void cache_enable(uint32_t cache_bit)
-{
-	uint32_t reg;
-
-	reg = get_cr();	/* get control reg. */
-	cp_delay();
-	set_cr(reg | cache_bit);
-}
-
-/* cache_bit must be either CR_I or CR_C */
-static void cache_disable(uint32_t cache_bit)
-{
-	uint32_t reg;
-
-	reg = get_cr();
-	cp_delay();
-	set_cr(reg & ~cache_bit);
-}
-
-void icache_enable(void)
-{
-	cache_enable(CR_I);
-}
-
-void icache_disable(void)
-{
-	cache_disable(CR_I);
-}
-
-int icache_status(void)
-{
-	return (get_cr() & CR_I) != 0;
-}
-
-void dcache_enable(void)
-{
-	cache_enable(CR_C);
-}
-
-void dcache_disable(void)
+/* flush I/D-cache */
+static void cache_flush (void)
 {
-	cache_disable(CR_C);
-}
+	unsigned long i = 0;
 
-int dcache_status(void)
-{
-	return (get_cr() & CR_C) != 0;
+	asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i));
 }
diff --git a/cpu/arm946es/cpu.c b/cpu/arm946es/cpu.c
index 25684f2018..8d0c53343a 100644
--- a/cpu/arm946es/cpu.c
+++ b/cpu/arm946es/cpu.c
@@ -38,13 +38,7 @@
 DECLARE_GLOBAL_DATA_PTR;
 #endif
 
-static void cp_delay (void)
-{
-	volatile int i;
-
-	/* copro seems to need some delay between reading and writing */
-	for (i = 0; i < 100; i++);
-}
+static void cache_flush(void);
 
 int cpu_init (void)
 {
@@ -67,8 +61,6 @@ int cleanup_before_linux (void)
 	 * we turn off caches etc ...
 	 */
 
-	unsigned long i;
-
 	disable_interrupts ();
 
 	/* ARM926E-S needs the protection unit enabled for the icache to have
@@ -76,15 +68,12 @@ int cleanup_before_linux (void)
 	 * should turn off the protection unit as well....
 	 */
 	/* turn off I/D-cache */
-	asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
-	i &= ~(CR_C | CR_I);
-	asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
-
+	icache_disable();
+	dcache_disable();
 	/* flush I/D-cache */
-	i = 0;
-	asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
-	asm ("mcr p15, 0, %0, c7, c6, 0": :"r" (i));
-	return (0);
+	cache_flush();
+
+	return 0;
 }
 
 int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
@@ -96,27 +85,12 @@ int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	/*NOTREACHED*/
 	return (0);
 }
-/* ARM926E-S needs the protection unit enabled for this to have any effect
-   - left for possible later use */
-void icache_enable (void)
-{
-	ulong reg;
 
-	reg = get_cr ();		/* get control reg. */
-	cp_delay ();
-	set_cr (reg | CR_I);
-}
-
-void icache_disable (void)
+/* flush I/D-cache */
+static void cache_flush (void)
 {
-	ulong reg;
+	unsigned long i = 0;
 
-	reg = get_cr ();
-	cp_delay ();
-	set_cr (reg & ~CR_I);
-}
-
-int icache_status (void)
-{
-	return (get_cr () & CR_I) != 0;
+	asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
+	asm ("mcr p15, 0, %0, c7, c6, 0": :"r" (i));
 }
diff --git a/cpu/arm_cortexa8/cpu.c b/cpu/arm_cortexa8/cpu.c
index 506dbec173..64ee972325 100644
--- a/cpu/arm_cortexa8/cpu.c
+++ b/cpu/arm_cortexa8/cpu.c
@@ -46,13 +46,6 @@ void l2cache_disable(void);
 
 static void cache_flush(void);
 
-static void cp_delay(void)
-{
-	/* Many OMAP regs need at least 2 nops */
-	asm("nop");
-	asm("nop");
-}
-
 int cpu_init(void)
 {
 	/*
@@ -111,33 +104,6 @@ int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	return 0;
 }
 
-void icache_enable(void)
-{
-	ulong reg;
-
-	reg = get_cr();	/* get control reg. */
-	cp_delay();
-	set_cr(reg | CR_I);
-}
-
-void icache_disable(void)
-{
-	ulong reg;
-
-	reg = get_cr();
-	cp_delay();
-	set_cr(reg & ~CR_I);
-}
-
-void dcache_disable (void)
-{
-	ulong reg;
-
-	reg = get_cr ();
-	cp_delay ();
-	set_cr (reg & ~CR_C);
-}
-
 void l2cache_enable()
 {
 	unsigned long i;
@@ -197,11 +163,6 @@ void l2cache_disable()
 	}
 }
 
-int icache_status(void)
-{
-	return (get_cr() & CR_I) != 0;
-}
-
 static void cache_flush(void)
 {
 	asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (0));
diff --git a/cpu/arm_intcm/cpu.c b/cpu/arm_intcm/cpu.c
index ccf7fd5b64..ea6747ae96 100644
--- a/cpu/arm_intcm/cpu.c
+++ b/cpu/arm_intcm/cpu.c
@@ -76,18 +76,3 @@ int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	/*NOTREACHED*/
 	return (0);
 }
-
-/* May not be cahed processor on the CM - do nothing */
-void icache_enable (void)
-{
-}
-
-void icache_disable (void)
-{
-}
-
-/* return "disabled" */
-int icache_status (void)
-{
-	return 0;
-}
diff --git a/cpu/ixp/cpu.c b/cpu/ixp/cpu.c
index 265c82088c..d9cfbabc16 100644
--- a/cpu/ixp/cpu.c
+++ b/cpu/ixp/cpu.c
@@ -42,6 +42,8 @@ ulong loops_per_jiffy;
 DECLARE_GLOBAL_DATA_PTR;
 #endif
 
+static void cache_flush(void);
+
 #if defined(CONFIG_DISPLAY_CPUINFO)
 int print_cpuinfo (void)
 {
@@ -99,19 +101,16 @@ int cleanup_before_linux (void)
 	 * just disable everything that can disturb booting linux
 	 */
 
-	unsigned long i;
-
 	disable_interrupts ();
 
 	/* turn off I-cache */
-	asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
-	i &= ~0x1000;
-	asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
+	icache_disable();
+	dcache_disable();
 
 	/* flush I-cache */
-	asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
+	cache_flush();
 
-	return (0);
+	return 0;
 }
 
 int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
@@ -126,55 +125,12 @@ int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	return (0);
 }
 
-/* cache_bit must be either CR_I or CR_C */
-static void cache_enable(uint32_t cache_bit)
-{
-	uint32_t reg;
-
-	reg = get_cr();	/* get control reg. */
-	cp_delay();
-	set_cr(reg | cache_bit);
-}
-
-/* cache_bit must be either CR_I or CR_C */
-static void cache_disable(uint32_t cache_bit)
-{
-	uint32_t reg;
-
-	reg = get_cr();
-	cp_delay();
-	set_cr(reg & ~cache_bit);
-}
-
-void icache_enable(void)
-{
-	cache_enable(CR_I);
-}
-
-void icache_disable(void)
-{
-	cache_disable(CR_I);
-}
-
-int icache_status(void)
+/* flush I/D-cache */
+static void cache_flush (void)
 {
-	return (get_cr() & CR_I) != 0;
-}
+	unsigned long i = 0;
 
-/* we will never enable dcache, because we have to setup MMU first */
-void dcache_enable (void)
-{
-	return;
-}
-
-void dcache_disable (void)
-{
-	return;
-}
-
-int dcache_status (void)
-{
-	return 0;					/* always off */
+	asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
 }
 
 /* FIXME */
diff --git a/cpu/lh7a40x/cpu.c b/cpu/lh7a40x/cpu.c
index 2c6799f13f..e862251ca2 100644
--- a/cpu/lh7a40x/cpu.c
+++ b/cpu/lh7a40x/cpu.c
@@ -38,13 +38,7 @@
 DECLARE_GLOBAL_DATA_PTR;
 #endif
 
-static void cp_delay (void)
-{
-	volatile int i;
-
-	/* copro seems to need some delay between reading and writing */
-	for (i = 0; i < 100; i++);
-}
+static void cache_flush(void);
 
 int cpu_init (void)
 {
@@ -67,19 +61,16 @@ int cleanup_before_linux (void)
 	 * we turn off caches etc ...
 	 */
 
-	unsigned long i;
-
 	disable_interrupts ();
 
 	/* turn off I/D-cache */
-	asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
-	i &= ~(CR_C | CR_I);
-	asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
+	icache_disable();
+	dcache_disable();
 
 	/* flush I/D-cache */
-	i = 0;
-	asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i));
-	return (0);
+	cache_flush();
+
+	return 0;
 }
 
 int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
@@ -90,52 +81,11 @@ int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	return (0);
 }
 
-void icache_enable (void)
-{
-	ulong reg;
-
-	reg = get_cr ();
-	cp_delay ();
-	set_cr (reg | CR_I);
-}
 
-void icache_disable (void)
+/* flush I/D-cache */
+static void cache_flush (void)
 {
-	ulong reg;
+	unsigned long i = 0;
 
-	reg = get_cr ();
-	cp_delay ();
-	set_cr (reg & ~CR_I);
-}
-
-int icache_status (void)
-{
-	return (get_cr () & CR_I) != 0;
-}
-
-#ifdef USE_920T_MMU
-/* It makes no sense to use the dcache if the MMU is not enabled */
-void dcache_enable (void)
-{
-	ulong reg;
-
-	reg = get_cr ();
-	cp_delay ();
-	set_cr (reg | CR_C);
-}
-
-void dcache_disable (void)
-{
-	ulong reg;
-
-	reg = get_cr ();
-	cp_delay ();
-	reg &= ~CR_C;
-	set_cr (reg);
-}
-
-int dcache_status (void)
-{
-	return (get_cr () & CR_C) != 0;
+	asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i));
 }
-#endif
diff --git a/cpu/pxa/cpu.c b/cpu/pxa/cpu.c
index e27b6b9179..ab58d39efc 100644
--- a/cpu/pxa/cpu.c
+++ b/cpu/pxa/cpu.c
@@ -39,6 +39,8 @@
 DECLARE_GLOBAL_DATA_PTR;
 #endif
 
+static void cache_flush(void);
+
 int cpu_init (void)
 {
 	/*
@@ -60,17 +62,14 @@ int cleanup_before_linux (void)
 	 * just disable everything that can disturb booting linux
 	 */
 
-	unsigned long i;
-
 	disable_interrupts ();
 
 	/* turn off I-cache */
-	asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
-	i &= ~0x1000;
-	asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
+	icache_disable();
+	dcache_disable();
 
 	/* flush I-cache */
-	asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
+	cache_flush();
 
 	return (0);
 }
@@ -87,55 +86,12 @@ int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	return (0);
 }
 
-/* cache_bit must be either CR_I or CR_C */
-static void cache_enable(uint32_t cache_bit)
-{
-	uint32_t reg;
-
-	reg = get_cr();	/* get control reg. */
-	cp_delay();
-	set_cr(reg | cache_bit);
-}
-
-/* cache_bit must be either CR_I or CR_C */
-static void cache_disable(uint32_t cache_bit)
-{
-	uint32_t reg;
-
-	reg = get_cr();
-	cp_delay();
-	set_cr(reg & ~cache_bit);
-}
-
-void icache_enable(void)
-{
-	cache_enable(CR_I);
-}
-
-void icache_disable(void)
+/* flush I/D-cache */
+static void cache_flush (void)
 {
-	cache_disable(CR_I);
-}
+	unsigned long i = 0;
 
-int icache_status(void)
-{
-	return (get_cr() & CR_I) != 0;
-}
-
-/* we will never enable dcache, because we have to setup MMU first */
-void dcache_enable (void)
-{
-	return;
-}
-
-void dcache_disable (void)
-{
-	return;
-}
-
-int dcache_status (void)
-{
-	return 0;					/* always off */
+	asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
 }
 
 #ifndef CONFIG_CPU_MONAHANS
diff --git a/cpu/sa1100/cpu.c b/cpu/sa1100/cpu.c
index d0dfa3d140..6c897d0d56 100644
--- a/cpu/sa1100/cpu.c
+++ b/cpu/sa1100/cpu.c
@@ -38,6 +38,8 @@
 DECLARE_GLOBAL_DATA_PTR;
 #endif
 
+static void cache_flush(void);
+
 int cpu_init (void)
 {
 	/*
@@ -59,17 +61,14 @@ int cleanup_before_linux (void)
 	 * just disable everything that can disturb booting linux
 	 */
 
-	unsigned long i;
-
 	disable_interrupts ();
 
 	/* turn off I-cache */
-	asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
-	i &= ~0x1000;
-	asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
+	icache_disable();
+	dcache_disable();
 
 	/* flush I-cache */
-	asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
+	cache_flush();
 
 	return (0);
 }
@@ -86,49 +85,10 @@ int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	return (0);
 }
 
-static void cp_delay (void)
-{
-	volatile int i;
-
-	/* copro seems to need some delay between reading and writing */
-	for (i = 0; i < 100; i++);
-}
-
-void icache_enable (void)
-{
-	ulong reg;
-
-	reg = get_cr ();
-	cp_delay ();
-	set_cr (reg | CR_C);
-}
-
-void icache_disable (void)
-{
-	ulong reg;
-
-	reg = get_cr ();
-	cp_delay ();
-	set_cr (reg & ~CR_C);
-}
-
-int icache_status (void)
-{
-	return (get_cr () & CR_C) != 0;
-}
-
-/* we will never enable dcache, because we have to setup MMU first */
-void dcache_enable (void)
+/* flush I/D-cache */
+static void cache_flush (void)
 {
-	return;
-}
-
-void dcache_disable (void)
-{
-	return;
-}
+	unsigned long i = 0;
 
-int dcache_status (void)
-{
-	return 0;					/* always off */
+	asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
 }
diff --git a/include/configs/B2.h b/include/configs/B2.h
index 01b65c515d..35fad5c553 100644
--- a/include/configs/B2.h
+++ b/include/configs/B2.h
@@ -38,6 +38,7 @@
 #define CONFIG_B2			1	/* on an B2 Board      */
 #define CONFIG_ARM_THUMB	1	/* this is an ARM7TDMI */
 #undef  CONFIG_ARM7_REVD		/* disable ARM720 REV.D Workarounds */
+#define CONFIG_SYS_NO_CP15_CACHE
 
 #define CONFIG_S3C44B0_CLOCK_SPEED	75 /* we have a 75Mhz S3C44B0*/
 
diff --git a/include/configs/assabet.h b/include/configs/assabet.h
index a6c442b51a..8c5b84cf69 100644
--- a/include/configs/assabet.h
+++ b/include/configs/assabet.h
@@ -37,6 +37,8 @@
 #define CONFIG_ASSABET		1	/* on an Intel Assabet Board    */
 
 #undef CONFIG_USE_IRQ
+/* we will never enable dcache, because we have to setup MMU first */
+#define CONFIG_SYS_NO_DCACHE
 
 #define CONFIG_CMDLINE_TAG	 1	/* enable passing of ATAGs      */
 #define CONFIG_SETUP_MEMORY_TAGS 1
diff --git a/include/configs/cerf250.h b/include/configs/cerf250.h
index 751e03c13f..82d1401469 100644
--- a/include/configs/cerf250.h
+++ b/include/configs/cerf250.h
@@ -41,6 +41,9 @@
 
 #undef	CONFIG_USE_IRQ			/* we don't need IRQ/FIQ stuff */
 
+/* we will never enable dcache, because we have to setup MMU first */
+#define CONFIG_SYS_NO_DCACHE
+
 /*
  * Size of malloc() pool
  */
diff --git a/include/configs/cradle.h b/include/configs/cradle.h
index 850d93b03e..75c5f9bb3e 100644
--- a/include/configs/cradle.h
+++ b/include/configs/cradle.h
@@ -37,6 +37,9 @@
 
 #undef CONFIG_USE_IRQ                   /* we don't need IRQ/FIQ stuff */
 
+/* we will never enable dcache, because we have to setup MMU first */
+#define CONFIG_SYS_NO_DCACHE
+
 /*
  * Size of malloc() pool
  */
diff --git a/include/configs/csb226.h b/include/configs/csb226.h
index d9f85f01ee..ed1845009e 100644
--- a/include/configs/csb226.h
+++ b/include/configs/csb226.h
@@ -42,6 +42,10 @@
 
 #undef CONFIG_USE_IRQ			/* we don't need IRQ/FIQ stuff      */
 					/* for timer/console/ethernet       */
+
+/* we will never enable dcache, because we have to setup MMU first */
+#define CONFIG_SYS_NO_DCACHE
+
 /*
  * Hardware drivers
  */
diff --git a/include/configs/delta.h b/include/configs/delta.h
index f5508b7740..bacbd90b5d 100644
--- a/include/configs/delta.h
+++ b/include/configs/delta.h
@@ -39,6 +39,9 @@
 #undef CONFIG_SKIP_RELOCATE_UBOOT
 #undef CONFIG_USE_IRQ			/* we don't need IRQ/FIQ stuff */
 
+/* we will never enable dcache, because we have to setup MMU first */
+#define CONFIG_SYS_NO_DCACHE
+
 /*
  * Size of malloc() pool
  */
diff --git a/include/configs/dnp1110.h b/include/configs/dnp1110.h
index 8f615bdb84..b6cfc6721d 100644
--- a/include/configs/dnp1110.h
+++ b/include/configs/dnp1110.h
@@ -42,6 +42,8 @@
 #define CONFIG_DNP1110		1	/* on an DNP/1110 Board      */
 
 #undef CONFIG_USE_IRQ			/* we don't need IRQ/FIQ stuff */
+/* we will never enable dcache, because we have to setup MMU first */
+#define CONFIG_SYS_NO_DCACHE
 
 /*
  * Size of malloc() pool
diff --git a/include/configs/evb4510.h b/include/configs/evb4510.h
index ffc9408bc8..0f415d9c8b 100644
--- a/include/configs/evb4510.h
+++ b/include/configs/evb4510.h
@@ -43,6 +43,7 @@
 #define CONFIG_ARM_THUMB	1	/* this is an ARM7TDMI	 */
 #define CONFIG_S3C4510B		1	/* it's a S3C4510B chip	 */
 #define CONFIG_EVB4510		1	/* on an EVB4510 Board	 */
+#define CONFIG_SYS_NO_CP15_CACHE
 
 #define CONFIG_USE_IRQ
 #define CONFIG_STACKSIZE_IRQ    (4*1024)
diff --git a/include/configs/gcplus.h b/include/configs/gcplus.h
index 77d45783c3..b2fbca2f3c 100644
--- a/include/configs/gcplus.h
+++ b/include/configs/gcplus.h
@@ -49,6 +49,8 @@
 #define CONFIG_GCPLUS		1	/* on an ADS GCPlus Board      */
 
 #undef CONFIG_USE_IRQ			/* we don't need IRQ/FIQ stuff */
+/* we will never enable dcache, because we have to setup MMU first */
+#define CONFIG_SYS_NO_DCACHE
 
 #define CONFIG_CMDLINE_TAG	 1	/* enable passing of ATAGs	*/
 #define CONFIG_SETUP_MEMORY_TAGS 1
diff --git a/include/configs/innokom.h b/include/configs/innokom.h
index 895998adf4..69654c7c0f 100644
--- a/include/configs/innokom.h
+++ b/include/configs/innokom.h
@@ -39,6 +39,10 @@
 
 #undef CONFIG_USE_IRQ			/* we don't need IRQ/FIQ stuff      */
 					/* for timer/console/ethernet       */
+
+/* we will never enable dcache, because we have to setup MMU first */
+#define CONFIG_SYS_NO_DCACHE
+
 /*
  * Hardware drivers
  */
diff --git a/include/configs/lart.h b/include/configs/lart.h
index e34ec222b8..5d6d460424 100644
--- a/include/configs/lart.h
+++ b/include/configs/lart.h
@@ -35,6 +35,8 @@
 #define CONFIG_LART		1	/* on an LART Board      */
 
 #undef CONFIG_USE_IRQ			/* we don't need IRQ/FIQ stuff */
+/* we will never enable dcache, because we have to setup MMU first */
+#define CONFIG_SYS_NO_DCACHE
 
 /*
  * Size of malloc() pool
diff --git a/include/configs/logodl.h b/include/configs/logodl.h
index 9afa800139..889a9a344d 100644
--- a/include/configs/logodl.h
+++ b/include/configs/logodl.h
@@ -39,6 +39,10 @@
 
 #undef CONFIG_USE_IRQ			/* we don't need IRQ/FIQ stuff      */
 					/* for timer/console/ethernet       */
+
+/* we will never enable dcache, because we have to setup MMU first */
+#define CONFIG_SYS_NO_DCACHE
+
 /*
  * Hardware drivers
  */
diff --git a/include/configs/lubbock.h b/include/configs/lubbock.h
index a4b430bbc5..2cf9c02815 100644
--- a/include/configs/lubbock.h
+++ b/include/configs/lubbock.h
@@ -46,6 +46,9 @@
 
 #undef CONFIG_USE_IRQ			/* we don't need IRQ/FIQ stuff */
 
+/* we will never enable dcache, because we have to setup MMU first */
+#define CONFIG_SYS_NO_DCACHE
+
 /*
  * Size of malloc() pool
  */
diff --git a/include/configs/pleb2.h b/include/configs/pleb2.h
index ab9ea4fdee..ed873faca7 100644
--- a/include/configs/pleb2.h
+++ b/include/configs/pleb2.h
@@ -42,6 +42,9 @@
 
 #undef CONFIG_USE_IRQ			/* we don't need IRQ/FIQ stuff */
 
+/* we will never enable dcache, because we have to setup MMU first */
+#define CONFIG_SYS_NO_DCACHE
+
 /*
  * Size of malloc() pool
  */
diff --git a/include/configs/pxa255_idp.h b/include/configs/pxa255_idp.h
index 5e2e7cfcc8..7485f7241c 100644
--- a/include/configs/pxa255_idp.h
+++ b/include/configs/pxa255_idp.h
@@ -68,6 +68,9 @@
 
 #undef CONFIG_USE_IRQ			/* we don't need IRQ/FIQ stuff */
 
+/* we will never enable dcache, because we have to setup MMU first */
+#define CONFIG_SYS_NO_DCACHE
+
 /*
  * Size of malloc() pool
  */
diff --git a/include/configs/shannon.h b/include/configs/shannon.h
index c8b0b161d8..13cc5ff3b7 100644
--- a/include/configs/shannon.h
+++ b/include/configs/shannon.h
@@ -44,6 +44,8 @@
 #define CONFIG_SHANNON		1	/* on an SHANNON/TuxScreen Board      */
 
 #undef CONFIG_USE_IRQ			/* we don't need IRQ/FIQ stuff */
+/* we will never enable dcache, because we have to setup MMU first */
+#define CONFIG_SYS_NO_DCACHE
 
 /*
  * Size of malloc() pool
diff --git a/include/configs/trizepsiv.h b/include/configs/trizepsiv.h
index c2744b5eba..49173181fb 100644
--- a/include/configs/trizepsiv.h
+++ b/include/configs/trizepsiv.h
@@ -47,6 +47,9 @@
 
 #undef CONFIG_USE_IRQ			/* we don't need IRQ/FIQ stuff */
 
+/* we will never enable dcache, because we have to setup MMU first */
+#define CONFIG_SYS_NO_DCACHE
+
 #define RTC
 
 /*
diff --git a/include/configs/wepep250.h b/include/configs/wepep250.h
index e74303da85..197ac0bbd6 100644
--- a/include/configs/wepep250.h
+++ b/include/configs/wepep250.h
@@ -27,6 +27,8 @@
 #define CONFIG_WEPEP250        1        /* config for wepep250 board */
 #undef  CONFIG_USE_IRQ                  /* don't need use IRQ/FIQ    */
 
+/* we will never enable dcache, because we have to setup MMU first */
+#define CONFIG_SYS_NO_DCACHE
 
 /*
  * Select serial console configuration
diff --git a/include/configs/xaeniax.h b/include/configs/xaeniax.h
index 086ca69c10..1632d29622 100644
--- a/include/configs/xaeniax.h
+++ b/include/configs/xaeniax.h
@@ -49,6 +49,9 @@
 
 #undef CONFIG_USE_IRQ			/* we don't need IRQ/FIQ stuff */
 
+/* we will never enable dcache, because we have to setup MMU first */
+#define CONFIG_SYS_NO_DCACHE
+
 /*
  * select serial console configuration
  */
diff --git a/include/configs/xm250.h b/include/configs/xm250.h
index 922eb2c6b0..c8bdf3186b 100644
--- a/include/configs/xm250.h
+++ b/include/configs/xm250.h
@@ -36,6 +36,9 @@
 #define CONFIG_XM250	       1	/* on a MicroSys XM250 Board	*/
 #undef CONFIG_USE_IRQ			/* we don't need IRQ/FIQ stuff	*/
 
+/* we will never enable dcache, because we have to setup MMU first */
+#define CONFIG_SYS_NO_DCACHE
+
 /*
  * Size of malloc() pool; this lives below the uppermost 128 KiB which are
  * used for the RAM copy of the uboot code
diff --git a/include/configs/xsengine.h b/include/configs/xsengine.h
index cad414c1d9..7e2abbf346 100644
--- a/include/configs/xsengine.h
+++ b/include/configs/xsengine.h
@@ -35,6 +35,9 @@
 #define CONFIG_DOS_PARTITION		1
 #define BOARD_LATE_INIT			1
 #undef  CONFIG_USE_IRQ					/* we don't need IRQ/FIQ stuff */
+/* we will never enable dcache, because we have to setup MMU first */
+#define CONFIG_SYS_NO_DCACHE
+
 #define CONFIG_SYS_HZ			1000
 #define CONFIG_SYS_CPUSPEED			0x161           /* set core clock to 400/200/100 MHz */
 
diff --git a/include/configs/zylonite.h b/include/configs/zylonite.h
index 064740d3cc..217636a618 100644
--- a/include/configs/zylonite.h
+++ b/include/configs/zylonite.h
@@ -47,6 +47,9 @@
 #undef CONFIG_SKIP_RELOCATE_UBOOT
 #undef CONFIG_USE_IRQ			/* we don't need IRQ/FIQ stuff */
 
+/* we will never enable dcache, because we have to setup MMU first */
+#define CONFIG_SYS_NO_DCACHE
+
 /*
  * Size of malloc() pool
  */
diff --git a/lib_arm/Makefile b/lib_arm/Makefile
index c8795b2314..3ac9d1f093 100644
--- a/lib_arm/Makefile
+++ b/lib_arm/Makefile
@@ -35,6 +35,9 @@ SOBJS-y	+= _umodsi3.o
 COBJS-y	+= board.o
 COBJS-y	+= bootm.o
 COBJS-y	+= cache.o
+ifndef CONFIG_SYS_NO_CP15_CACHE
+COBJS-y	+= cache-cp15.o
+endif
 COBJS-y	+= div0.o
 COBJS-y	+= interrupts.o
 
diff --git a/lib_arm/cache-cp15.c b/lib_arm/cache-cp15.c
new file mode 100644
index 0000000000..62ed54fb4d
--- /dev/null
+++ b/lib_arm/cache-cp15.c
@@ -0,0 +1,120 @@
+/*
+ * (C) Copyright 2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * 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 <asm/system.h>
+
+#if !(defined(CONFIG_SYS_NO_ICACHE) && defined(CONFIG_SYS_NO_DCACHE))
+static void cp_delay (void)
+{
+	volatile int i;
+
+	/* copro seems to need some delay between reading and writing */
+	for (i = 0; i < 100; i++)
+		nop();
+}
+
+/* cache_bit must be either CR_I or CR_C */
+static void cache_enable(uint32_t cache_bit)
+{
+	uint32_t reg;
+
+	reg = get_cr();	/* get control reg. */
+	cp_delay();
+	set_cr(reg | cache_bit);
+}
+
+/* cache_bit must be either CR_I or CR_C */
+static void cache_disable(uint32_t cache_bit)
+{
+	uint32_t reg;
+
+	reg = get_cr();
+	cp_delay();
+	set_cr(reg & ~cache_bit);
+}
+#endif
+
+#ifdef CONFIG_SYS_NO_ICACHE
+void icache_enable (void)
+{
+	return;
+}
+
+void icache_disable (void)
+{
+	return;
+}
+
+int icache_status (void)
+{
+	return 0;					/* always off */
+}
+#else
+void icache_enable(void)
+{
+	cache_enable(CR_I);
+}
+
+void icache_disable(void)
+{
+	cache_disable(CR_I);
+}
+
+int icache_status(void)
+{
+	return (get_cr() & CR_I) != 0;
+}
+#endif
+
+#ifdef CONFIG_SYS_NO_DCACHE
+void dcache_enable (void)
+{
+	return;
+}
+
+void dcache_disable (void)
+{
+	return;
+}
+
+int dcache_status (void)
+{
+	return 0;					/* always off */
+}
+#else
+void dcache_enable(void)
+{
+	cache_enable(CR_C);
+}
+
+void dcache_disable(void)
+{
+	cache_disable(CR_C);
+}
+
+int dcache_status(void)
+{
+	return (get_cr() & CR_C) != 0;
+}
+#endif