arch/tile: core support for Tilera 32-bit chips.

This change is the core kernel support for TILEPro and TILE64 chips.
No driver support (except the console driver) is included yet.

This includes the relevant Linux headers in asm/; the low-level
low-level "Tile architecture" headers in arch/, which are
shared with the hypervisor, etc., and are build-system agnostic;
and the relevant hypervisor headers in hv/.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Reviewed-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 145 insertions, 0 deletions

diff --git a/arch/tile/include/asm/cacheflush.h b/arch/tile/include/asm/cacheflush.h
new file mode 100644
index 000000000000..7e2096a4ef7d
--- /dev/null
+++ b/arch/tile/include/asm/cacheflush.h
@@ -0,0 +1,145 @@
+/*
+ * Copyright 2010 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+#ifndef _ASM_TILE_CACHEFLUSH_H
+#define _ASM_TILE_CACHEFLUSH_H
+
+#include <arch/chip.h>
+
+/* Keep includes the same across arches.  */
+#include <linux/mm.h>
+#include <linux/cache.h>
+#include <asm/system.h>
+
+/* Caches are physically-indexed and so don't need special treatment */
+#define flush_cache_all()                       do { } while (0)
+#define flush_cache_mm(mm)                      do { } while (0)
+#define flush_cache_dup_mm(mm)                  do { } while (0)
+#define flush_cache_range(vma, start, end)      do { } while (0)
+#define flush_cache_page(vma, vmaddr, pfn)      do { } while (0)
+#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
+#define flush_dcache_page(page)                 do { } while (0)
+#define flush_dcache_mmap_lock(mapping)         do { } while (0)
+#define flush_dcache_mmap_unlock(mapping)       do { } while (0)
+#define flush_cache_vmap(start, end)            do { } while (0)
+#define flush_cache_vunmap(start, end)          do { } while (0)
+#define flush_icache_page(vma, pg)              do { } while (0)
+#define flush_icache_user_range(vma, pg, adr, len)      do { } while (0)
+
+/* See "arch/tile/lib/__invalidate_icache.S". */
+extern void __invalidate_icache(unsigned long start, unsigned long size);
+
+/* Flush the icache just on this cpu */
+static inline void __flush_icache_range(unsigned long start, unsigned long end)
+{
+        __invalidate_icache(start, end - start);
+}
+
+/* Flush the entire icache on this cpu. */
+#define __flush_icache() __flush_icache_range(0, CHIP_L1I_CACHE_SIZE())
+
+#ifdef CONFIG_SMP
+/*
+ * When the kernel writes to its own text we need to do an SMP
+ * broadcast to make the L1I coherent everywhere.  This includes
+ * module load and single step.
+ */
+extern void flush_icache_range(unsigned long start, unsigned long end);
+#else
+#define flush_icache_range __flush_icache_range
+#endif
+
+/*
+ * An update to an executable user page requires icache flushing.
+ * We could carefully update only tiles that are running this process,
+ * and rely on the fact that we flush the icache on every context
+ * switch to avoid doing extra work here.  But for now, I'll be
+ * conservative and just do a global icache flush.
+ */
+static inline void copy_to_user_page(struct vm_area_struct *vma,
+                                     struct page *page, unsigned long vaddr,
+                                     void *dst, void *src, int len)
+{
+        memcpy(dst, src, len);
+        if (vma->vm_flags & VM_EXEC) {
+                flush_icache_range((unsigned long) dst,
+                                   (unsigned long) dst + len);
+        }
+}
+
+#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
+        memcpy((dst), (src), (len))
+
+/*
+ * Invalidate a VA range; pads to L2 cacheline boundaries.
+ *
+ * Note that on TILE64, __inv_buffer() actually flushes modified
+ * cache lines in addition to invalidating them, i.e., it's the
+ * same as __finv_buffer().
+ */
+static inline void __inv_buffer(void *buffer, size_t size)
+{
+        char *next = (char *)((long)buffer & -L2_CACHE_BYTES);
+        char *finish = (char *)L2_CACHE_ALIGN((long)buffer + size);
+        while (next < finish) {
+                __insn_inv(next);
+                next += CHIP_INV_STRIDE();
+        }
+}
+
+/* Flush a VA range; pads to L2 cacheline boundaries. */
+static inline void __flush_buffer(void *buffer, size_t size)
+{
+        char *next = (char *)((long)buffer & -L2_CACHE_BYTES);
+        char *finish = (char *)L2_CACHE_ALIGN((long)buffer + size);
+        while (next < finish) {
+                __insn_flush(next);
+                next += CHIP_FLUSH_STRIDE();
+        }
+}
+
+/* Flush & invalidate a VA range; pads to L2 cacheline boundaries. */
+static inline void __finv_buffer(void *buffer, size_t size)
+{
+        char *next = (char *)((long)buffer & -L2_CACHE_BYTES);
+        char *finish = (char *)L2_CACHE_ALIGN((long)buffer + size);
+        while (next < finish) {
+                __insn_finv(next);
+                next += CHIP_FINV_STRIDE();
+        }
+}
+
+
+/* Invalidate a VA range, then memory fence. */
+static inline void inv_buffer(void *buffer, size_t size)
+{
+        __inv_buffer(buffer, size);
+        mb_incoherent();
+}
+
+/* Flush a VA range, then memory fence. */
+static inline void flush_buffer(void *buffer, size_t size)
+{
+        __flush_buffer(buffer, size);
+        mb_incoherent();
+}
+
+/* Flush & invalidate a VA range, then memory fence. */
+static inline void finv_buffer(void *buffer, size_t size)
+{
+        __finv_buffer(buffer, size);
+        mb_incoherent();
+}
+
+#endif /* _ASM_TILE_CACHEFLUSH_H */