pxa: add support for D- and I- caches

Tested with OHCI and pxafb drivers - no issues found

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>

arch/arm/cpu/pxa/Makefile

@@ -14,3 +14,4 @@ obj-y	+= cpuinfo.o
 obj-y	+= timer.o
 obj-y	+= usb.o
 obj-y	+= relocate.o
+obj-y	+= cache.o

arch/arm/cpu/pxa/cache.c

@@ -0,0 +1,62 @@
+/*
+ * (C) Copyright 2016 Vasily Khoruzhick <anarsoul@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <linux/types.h>
+#include <common.h>
+
+#ifndef CONFIG_SYS_DCACHE_OFF
+
+#ifndef CONFIG_SYS_CACHELINE_SIZE
+#define CONFIG_SYS_CACHELINE_SIZE	32
+#endif
+
+void invalidate_dcache_all(void)
+{
+	/* Flush/Invalidate I cache */
+	asm volatile("mcr p15, 0, %0, c7, c5, 0\n" : : "r"(0));
+	/* Flush/Invalidate D cache */
+	asm volatile("mcr p15, 0, %0, c7, c6, 0\n" : : "r"(0));
+}
+
+void flush_dcache_all(void)
+{
+	return invalidate_dcache_all();
+}
+
+void invalidate_dcache_range(unsigned long start, unsigned long stop)
+{
+	start &= ~(CONFIG_SYS_CACHELINE_SIZE - 1);
+	stop &= ~(CONFIG_SYS_CACHELINE_SIZE - 1);
+
+	while (start <= stop) {
+		asm volatile("mcr p15, 0, %0, c7, c6, 1\n" : : "r"(start));
+		start += CONFIG_SYS_CACHELINE_SIZE;
+	}
+}
+
+void flush_dcache_range(unsigned long start, unsigned long stop)
+{
+	return invalidate_dcache_range(start, stop);
+}
+#else /* #ifndef CONFIG_SYS_DCACHE_OFF */
+void invalidate_dcache_all(void)
+{
+}
+
+void flush_dcache_all(void)
+{
+}
+#endif /* #ifndef CONFIG_SYS_DCACHE_OFF */
+
+/*
+ * Stub implementations for l2 cache operations
+ */
+
+__weak void l2_cache_disable(void) {}
+
+#if defined CONFIG_SYS_THUMB_BUILD
+__weak void invalidate_l2_cache(void) {}
+#endif

arch/arm/cpu/pxa/pxa2xx.c

@@ -284,3 +284,13 @@ void reset_cpu(ulong ignored)
 	for (;;)
 		;
 }
+
+void enable_caches(void)
+{
+#ifndef CONFIG_SYS_ICACHE_OFF
+	icache_enable();
+#endif
+#ifndef CONFIG_SYS_DCACHE_OFF
+	dcache_enable();
+#endif
+}

include/configs/pxa-common.h

@@ -10,6 +10,7 @@
 #define	__CONFIG_PXA_COMMON_H__
 
 #define	CONFIG_DISPLAY_CPUINFO
+#define	CONFIG_SYS_ARM_CACHE_WRITETHROUGH
 
 /*
  * KGDB