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>

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>
Heiko Schocher · Andreas Bießmann
1 parent 806a5a3958
Showing 3 changed files with 30 additions and 6 deletions Side-by-side Diff
arch/arm/mach-at91/arm926ejs/Makefile
arch/arm/mach-at91/arm926ejs/cache.c
board/bluewater/gurnard/gurnard.c
@@ -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
+/*
+ * (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
@@ -414,12 +414,6 @@
 {
 }
  
-/* This breaks the Ethernet MAC at present */
-void enable_caches(void)
-{
-	dcache_enable();
-}
-
 /* SPI chip select control - only used for FPGA programming */
 #ifdef CONFIG_ATMEL_SPI
...	...	@@ -18,6 +18,7 @@
18	18	obj-$(CONFIG_AT91SAM9X5) += at91sam9x5_devices.o
19	19	obj-$(CONFIG_AT91_EFLASH) += eflash.o
20	20	obj-$(CONFIG_AT91_LED) += led.o
	21	+obj-y += cache.o
21	22	obj-y += clock.o
22	23	obj-y += cpu.o
23	24	obj-y += reset.o
	1	+/*
	2	+ * (C) Copyright 2016
	3	+ * Heiko Schocher, DENX Software Engineering, hs@denx.de.
	4	+ *
	5	+ * SPDX-License-Identifier: GPL-2.0+
	6	+ */
	7	+#include <linux/types.h>
	8	+#include <common.h>
	9	+
	10	+void enable_caches(void)
	11	+{
	12	+#ifndef CONFIG_SYS_ICACHE_OFF
	13	+ icache_enable();
	14	+#endif
	15	+}
	16	+
	17	+#ifndef CONFIG_SYS_ICACHE_OFF
	18	+/* Invalidate entire I-cache and branch predictor array */
	19	+void invalidate_icache_all(void)
	20	+{
	21	+ unsigned long i = 0;
	22	+
	23	+ asm ("mcr p15, 0, %0, c7, c5, 0" : : "r" (i));
	24	+}
	25	+#else
	26	+void invalidate_icache_all(void)
	27	+{
	28	+}
	29	+#endif
...	...	@@ -414,12 +414,6 @@
414	414	{
415	415	}
416	416
417		-/* This breaks the Ethernet MAC at present */
418		-void enable_caches(void)
419		-{
420		- dcache_enable();
421		-}
422		-
423	417	/* SPI chip select control - only used for FPGA programming */
424	418	#ifdef CONFIG_ATMEL_SPI
425	419