This is the basic devicetree support for C6X. Currently, four boards are
supported. Each one uses a different SoC part. Two of the four supported
SoCs are multicore. One with 3 cores and the other with 6 cores. There is
no coherency between the core-level caches, so SMP is not an option. It is
possible to run separate kernel instances on the various cores. There is
currently no C6X bootloader support for device trees so we build in the
DTB for now.

There are some interesting twists to the hardware which are of note for device
tree support. Each core has its own interrupt controller which is controlled
by special purpose core registers. This core controller provides 12 general
purpose prioritized interrupt sources. Each core is contained within a
hardware "module" which provides L1 and L2 caches, power control, and another
interrupt controller which cascades into the core interrupt controller. These
core module functions are controlled by memory mapped registers. The addresses
for these registers are the same for each core. That is, when coreN accesses
a module-level MMIO register at a given address, it accesses the register for
coreN even though other cores would use the same address to access the register
in the module containing those cores. Other hardware modules (timers, enet, etc)
which are memory mapped can be accessed by all cores.

The timers need some further explanation for multicore SoCs. Even though all
timer control registers are visible to all cores, interrupt routing or other
considerations may make a given timer more suitable for use by a core than
some other timer. Because of this and the desire to have the same image run
on more than one core, the timer nodes have a "ti,core-mask" property which
is used by the driver to scan for a suitable timer to use.

Signed-off-by: Mark Salter <redacted>
Cc: devicetree-discuss at lists.ozlabs.org
---
 arch/c6x/boot/dts/dsk6455.dts  |  128 +++++++++++++++
 arch/c6x/boot/dts/evmc6457.dts |  106 +++++++++++++
 arch/c6x/boot/dts/evmc6472.dts |  176 +++++++++++++++++++++
 arch/c6x/boot/dts/evmc6474.dts |  133 ++++++++++++++++
 arch/c6x/boot/install-dtb.c    |  333 ++++++++++++++++++++++++++++++++++++++++
 arch/c6x/kernel/devicetree.c   |   53 +++++++
 arch/c6x/platforms/platform.c  |   23 +++
 7 files changed, 952 insertions(+), 0 deletions(-)
 create mode 100644 arch/c6x/boot/dts/dsk6455.dts
 create mode 100644 arch/c6x/boot/dts/evmc6457.dts
 create mode 100644 arch/c6x/boot/dts/evmc6472.dts
 create mode 100644 arch/c6x/boot/dts/evmc6474.dts
 create mode 100644 arch/c6x/boot/install-dtb.c
 create mode 100644 arch/c6x/kernel/devicetree.c
 create mode 100644 arch/c6x/platforms/platform.c

diff --git a/arch/c6x/boot/dts/dsk6455.dts b/arch/c6x/boot/dts/dsk6455.dts
new file mode 100644
index 0000000..ef703aa
--- /dev/null
+++ b/arch/c6x/boot/dts/dsk6455.dts

@@ -0,0 +1,128 @@
+/*
+ * arch/c6x/boot/dts/dsk6455.dts
+ *
+ * DSK6455 Evaluation Platform For TMS320C6455
+ * Copyright (C) 2011 Texas Instruments Incorporated
+ *
+ * Author: Mark Salter <msalter@redhat.com>
+ *
+ * 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; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ */
+
+/dts-v1/;
+

diff --git a/arch/c6x/boot/install-dtb.c b/arch/c6x/boot/install-dtb.c
new file mode 100644
index 0000000..fa979ce
--- /dev/null
+++ b/arch/c6x/boot/install-dtb.c

@@ -0,0 +1,333 @@
+/*
+ * Program to hack in a DTB to an ELF file having a placeholder
+ * section named __fst_blob.
+ *
+ * This allows for building multiple images with builtin DTBs
+ * using a single vmlinux image. This is only necessary until
+ * bootloader support exists.
+ *
+ * Copyright 2011 Texas Instruments Incorporated
+ *
+ * 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; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Usage: install-dtb <image.dtb> <kernel.elf>
+ */

diff --git a/arch/c6x/kernel/devicetree.c b/arch/c6x/kernel/devicetree.c
new file mode 100644
index 0000000..bdb56f0
--- /dev/null
+++ b/arch/c6x/kernel/devicetree.c

@@ -0,0 +1,53 @@
+/*
+ *  Architecture specific OF callbacks.
+ *
+ *  Copyright (C) 2011 Texas Instruments Incorporated
+ *  Author: Mark Salter <msalter@redhat.com>
+ *
+ *  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/of.h>
+#include <linux/of_fdt.h>
+#include <linux/initrd.h>
+#include <linux/memblock.h>
+
+void __init early_init_devtree(void *params)
+{
+	/* Setup flat device-tree pointer */
+	initial_boot_params = params;
+
+	/* Retrieve various informations from the /chosen node of the
+	 * device-tree, including the platform type, initrd location and
+	 * size and more ...
+	 */
+	of_scan_flat_dt(early_init_dt_scan_chosen, c6x_command_line);
+
+	/* Scan memory nodes and rebuild MEMBLOCKs */
+	of_scan_flat_dt(early_init_dt_scan_root, NULL);
+	of_scan_flat_dt(early_init_dt_scan_memory, NULL);
+}
+
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void __init early_init_dt_setup_initrd_arch(unsigned long start,
+		unsigned long end)
+{
+	initrd_start = (unsigned long)__va(start);
+	initrd_end = (unsigned long)__va(end);
+	initrd_below_start_ok = 1;
+}
+#endif
+
+void __init early_init_dt_add_memory_arch(u64 base, u64 size)
+{
+	c6x_add_memory(base, size);
+}
+
+void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
+{
+	return __va(memblock_alloc(size, align));
+}

diff --git a/arch/c6x/platforms/platform.c b/arch/c6x/platforms/platform.c
new file mode 100644
index 0000000..83fbedd
--- /dev/null
+++ b/arch/c6x/platforms/platform.c

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2011 Texas Instruments Incorporated
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#include <linux/init.h>
+#include <linux/of_platform.h>
+
+static struct of_device_id c6x_bus_ids[] __initdata = {
+	{ .type = "soc", },