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>

1 files changed, 75 insertions, 0 deletions

diff --git a/arch/arm/mm/tlb-fa.S b/arch/arm/mm/tlb-fa.S
new file mode 100644
index 000000000000..9694f1f6f485
--- /dev/null
+++ b/arch/arm/mm/tlb-fa.S
@@ -0,0 +1,75 @@
+/*
+ *  linux/arch/arm/mm/tlb-fa.S
+ *
+ *  Copyright (C) 2005 Faraday Corp.
+ *  Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
+ *
+ * Based on tlb-v4wbi.S:
+ *  Copyright (C) 1997-2002 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.
+ *
+ *  ARM architecture version 4, Faraday variation.
+ *  This assume an unified TLBs, with a write buffer, and branch target buffer (BTB)
+ *
+ *  Processors: FA520 FA526 FA626
+ */
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <asm/asm-offsets.h>
+#include <asm/tlbflush.h>
+#include "proc-macros.S"
+
+
+/*
+ *      flush_user_tlb_range(start, end, mm)
+ *
+ *      Invalidate a range of TLB entries in the specified address space.
+ *
+ *      - start - range start address
+ *      - end   - range end address
+ *      - mm    - mm_struct describing address space
+ */
+        .align  4
+ENTRY(fa_flush_user_tlb_range)
+        vma_vm_mm ip, r2
+        act_mm  r3                              @ get current->active_mm
+        eors    r3, ip, r3                      @ == mm ?
+        movne   pc, lr                          @ no, we dont do anything
+        mov     r3, #0
+        mcr     p15, 0, r3, c7, c10, 4          @ drain WB
+        bic     r0, r0, #0x0ff
+        bic     r0, r0, #0xf00
+1:      mcr     p15, 0, r0, c8, c7, 1           @ invalidate UTLB entry
+        add     r0, r0, #PAGE_SZ
+        cmp     r0, r1
+        blo     1b
+        mcr     p15, 0, r3, c7, c5, 6           @ invalidate BTB
+        mcr     p15, 0, r3, c7, c10, 4          @ data write barrier
+        mov     pc, lr
+
+
+ENTRY(fa_flush_kern_tlb_range)
+        mov     r3, #0
+        mcr     p15, 0, r3, c7, c10, 4          @ drain WB
+        bic     r0, r0, #0x0ff
+        bic     r0, r0, #0xf00
+1:      mcr     p15, 0, r0, c8, c7, 1           @ invalidate UTLB entry
+        add     r0, r0, #PAGE_SZ
+        cmp     r0, r1
+        blo     1b
+        mcr     p15, 0, r3, c7, c5, 6           @ invalidate BTB
+        mcr     p15, 0, r3, c7, c10, 4          @ data write barrier
+        mcr     p15, 0, r3, c7, c5, 4           @ prefetch flush
+        mov     pc, lr
+
+        __INITDATA
+
+        .type   fa_tlb_fns, #object
+ENTRY(fa_tlb_fns)
+        .long   fa_flush_user_tlb_range
+        .long   fa_flush_kern_tlb_range
+        .long   fa_tlb_flags
+        .size   fa_tlb_fns, . - fa_tlb_fns