arm, at91: add icache support
add at least icache support for at91 based boards.
This speeds up NOR flash access on an at91sam9g15
based board from 15.2 seconds reading 8 MiB from
a SPI NOR flash to 5.7 seconds.
Signed-off-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Andreas Bießmann <andreas@biessmann.org>
diff --git a/arch/arm/mach-at91/arm926ejs/Makefile b/arch/arm/mach-at91/arm926ejs/Makefile
index ddc323f..d36e15a 100644
--- a/arch/arm/mach-at91/arm926ejs/Makefile
+++ b/arch/arm/mach-at91/arm926ejs/Makefile
@@ -18,6 +18,7 @@
obj-$(CONFIG_AT91SAM9X5) += at91sam9x5_devices.o
obj-$(CONFIG_AT91_EFLASH) += eflash.o
obj-$(CONFIG_AT91_LED) += led.o
+obj-y += cache.o
obj-y += clock.o
obj-y += cpu.o
obj-y += reset.o
diff --git a/arch/arm/mach-at91/arm926ejs/cache.c b/arch/arm/mach-at91/arm926ejs/cache.c
new file mode 100644
index 0000000..8813706
--- /dev/null
+++ b/arch/arm/mach-at91/arm926ejs/cache.c
@@ -0,0 +1,29 @@
+/*
+ * (C) Copyright 2016
+ * Heiko Schocher, DENX Software Engineering, hs@denx.de.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+#include <linux/types.h>
+#include <common.h>
+
+void enable_caches(void)
+{
+#ifndef CONFIG_SYS_ICACHE_OFF
+ icache_enable();
+#endif
+}
+
+#ifndef CONFIG_SYS_ICACHE_OFF
+/* Invalidate entire I-cache and branch predictor array */
+void invalidate_icache_all(void)
+{
+ unsigned long i = 0;
+
+ asm ("mcr p15, 0, %0, c7, c5, 0" : : "r" (i));
+}
+#else
+void invalidate_icache_all(void)
+{
+}
+#endif