ARM: Add support for FA526 v2
Adds support for Faraday FA526 core. This core is used at least by:
Cortina Systems Gemini and Centroid family
Cavium Networks ECONA family
Grain Media GM8120
Pixelplus ImageARM
Prolific PL-1029
Faraday IP evaluation boards
v2:
- move TLB_BTB to separate patch
- update copyrights
Signed-off-by: Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
diff --git a/arch/arm/mm/copypage-fa.c b/arch/arm/mm/copypage-fa.c
new file mode 100644
index 0000000..b2a6008
--- /dev/null
+++ b/arch/arm/mm/copypage-fa.c
@@ -0,0 +1,86 @@
+/*
+ * linux/arch/arm/lib/copypage-fa.S
+ *
+ * Copyright (C) 2005 Faraday Corp.
+ * Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
+ *
+ * Based on copypage-v4wb.S:
+ * Copyright (C) 1995-1999 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/init.h>
+#include <linux/highmem.h>
+
+/*
+ * Faraday optimised copy_user_page
+ */
+static void __naked
+fa_copy_user_page(void *kto, const void *kfrom)
+{
+ asm("\
+ stmfd sp!, {r4, lr} @ 2\n\
+ mov r2, %0 @ 1\n\
+1: ldmia r1!, {r3, r4, ip, lr} @ 4\n\
+ stmia r0, {r3, r4, ip, lr} @ 4\n\
+ mcr p15, 0, r0, c7, c14, 1 @ 1 clean and invalidate D line\n\
+ add r0, r0, #16 @ 1\n\
+ ldmia r1!, {r3, r4, ip, lr} @ 4\n\
+ stmia r0, {r3, r4, ip, lr} @ 4\n\
+ mcr p15, 0, r0, c7, c14, 1 @ 1 clean and invalidate D line\n\
+ add r0, r0, #16 @ 1\n\
+ subs r2, r2, #1 @ 1\n\
+ bne 1b @ 1\n\
+ mcr p15, 0, r2, c7, c10, 4 @ 1 drain WB\n\
+ ldmfd sp!, {r4, pc} @ 3"
+ :
+ : "I" (PAGE_SIZE / 32));
+}
+
+void fa_copy_user_highpage(struct page *to, struct page *from,
+ unsigned long vaddr)
+{
+ void *kto, *kfrom;
+
+ kto = kmap_atomic(to, KM_USER0);
+ kfrom = kmap_atomic(from, KM_USER1);
+ fa_copy_user_page(kto, kfrom);
+ kunmap_atomic(kfrom, KM_USER1);
+ kunmap_atomic(kto, KM_USER0);
+}
+
+/*
+ * Faraday optimised clear_user_page
+ *
+ * Same story as above.
+ */
+void fa_clear_user_highpage(struct page *page, unsigned long vaddr)
+{
+ void *ptr, *kaddr = kmap_atomic(page, KM_USER0);
+ asm volatile("\
+ mov r1, %2 @ 1\n\
+ mov r2, #0 @ 1\n\
+ mov r3, #0 @ 1\n\
+ mov ip, #0 @ 1\n\
+ mov lr, #0 @ 1\n\
+1: stmia %0, {r2, r3, ip, lr} @ 4\n\
+ mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\
+ add %0, %0, #16 @ 1\n\
+ stmia %0, {r2, r3, ip, lr} @ 4\n\
+ mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\
+ add %0, %0, #16 @ 1\n\
+ subs r1, r1, #1 @ 1\n\
+ bne 1b @ 1\n\
+ mcr p15, 0, r1, c7, c10, 4 @ 1 drain WB"
+ : "=r" (ptr)
+ : "0" (kaddr), "I" (PAGE_SIZE / 32)
+ : "r1", "r2", "r3", "ip", "lr");
+ kunmap_atomic(kaddr, KM_USER0);
+}
+
+struct cpu_user_fns fa_user_fns __initdata = {
+ .cpu_clear_user_highpage = fa_clear_user_highpage,
+ .cpu_copy_user_highpage = fa_copy_user_highpage,
+};