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, 47 insertions, 0 deletions

diff --git a/arch/tile/include/asm/timex.h b/arch/tile/include/asm/timex.h
new file mode 100644
index 000000000000..3baf5fc4c0a1
--- /dev/null
+++ b/arch/tile/include/asm/timex.h
@@ -0,0 +1,47 @@
+/*
+ * 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_TIMEX_H
+#define _ASM_TILE_TIMEX_H
+
+/*
+ * This rate should be a multiple of the possible HZ values (100, 250, 1000)
+ * and a fraction of the possible hardware timer frequencies.  Our timer
+ * frequency is highly tunable but also quite precise, so for the primary use
+ * of this value (setting ACT_HZ from HZ) we just pick a value that causes
+ * ACT_HZ to be set to HZ.  We make the value somewhat large just to be
+ * more robust in case someone tries out a new value of HZ.
+ */
+#define CLOCK_TICK_RATE 1000000
+
+typedef unsigned long long cycles_t;
+
+#if CHIP_HAS_SPLIT_CYCLE()
+cycles_t get_cycles(void);
+#else
+static inline cycles_t get_cycles(void)
+{
+        return __insn_mfspr(SPR_CYCLE);
+}
+#endif
+
+cycles_t get_clock_rate(void);
+
+/* Called at cpu initialization to set some low-level constants. */
+void setup_clock(void);
+
+/* Called at cpu initialization to start the tile-timer clock device. */
+void setup_tile_timer(void);
+
+#endif /* _ASM_TILE_TIMEX_H */