[POWERPC] Support for the Ebony 440GP reference board in arch/powerpc

This adds platform support code for the Ebony (440GP) evaluation
board.  This includes both code in arch/powerpc/platforms/44x for
board initialization, and zImage wrapper code to correctly tweak the
flattened device tree based on information from the firmware.  The
zImage supports both IBM OpenBIOS (aka "treeboot") and old versions of
uboot which don't support a flattened device tree.

Signed-off-by: David Gibson <dwg@au1.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

3 files changed, 130 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/44x/Kconfig b/arch/powerpc/platforms/44x/Kconfig
new file mode 100644
index 000000000000..8e66949e7c67
--- /dev/null
+++ b/arch/powerpc/platforms/44x/Kconfig
@@ -0,0 +1,56 @@
+#config BAMBOO
+#       bool "Bamboo"
+#       depends on 44x
+#       default n
+#       select 440EP
+#       help
+#         This option enables support for the IBM PPC440EP evaluation board.
+
+config EBONY
+        bool "Ebony"
+        depends on 44x
+        default y
+        select 440GP
+        help
+          This option enables support for the IBM PPC440GP evaluation board.
+
+#config LUAN
+#       bool "Luan"
+#       depends on 44x
+#       default n
+#       select 440SP
+#       help
+#         This option enables support for the IBM PPC440SP evaluation board.
+
+#config OCOTEA
+#       bool "Ocotea"
+#       depends on 44x
+#       default n
+#       select 440GX
+#       help
+#         This option enables support for the IBM PPC440GX evaluation board.
+
+# 44x specific CPU modules, selected based on the board above.
+config 440EP
+        bool
+        select PPC_FPU
+        select IBM440EP_ERR42
+
+config 440GP
+        bool
+        select IBM_NEW_EMAC_ZMII
+
+config 440GX
+        bool
+
+config 440SP
+        bool
+
+config 440A
+        bool
+        depends on 440GX
+        default y
+
+# 44x errata/workaround config symbols, selected by the CPU models above
+config IBM440EP_ERR42
+        bool
diff --git a/arch/powerpc/platforms/44x/Makefile b/arch/powerpc/platforms/44x/Makefile
index 575fdde5c905..41d0a18a0e44 100644
--- a/arch/powerpc/platforms/44x/Makefile
+++ b/arch/powerpc/platforms/44x/Makefile
@@ -1 +1,2 @@
 obj-$(CONFIG_44x)       := misc_44x.o
+obj-$(CONFIG_EBONY)     += ebony.o
diff --git a/arch/powerpc/platforms/44x/ebony.c b/arch/powerpc/platforms/44x/ebony.c
new file mode 100644
index 000000000000..ad526eafc90b
--- /dev/null
+++ b/arch/powerpc/platforms/44x/ebony.c
@@ -0,0 +1,73 @@
+/*
+ * Ebony board specific routines
+ *
+ * Matt Porter <mporter@kernel.crashing.org>
+ * Copyright 2002-2005 MontaVista Software Inc.
+ *
+ * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
+ * Copyright (c) 2003-2005 Zultys Technologies
+ *
+ * Rewritten and ported to the merged powerpc tree:
+ * Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
+ *
+ * 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.
+ */
+
+#include <linux/init.h>
+#include <asm/machdep.h>
+#include <asm/prom.h>
+#include <asm/udbg.h>
+#include <asm/time.h>
+#include <asm/uic.h>
+#include <asm/of_platform.h>
+
+#include "44x.h"
+
+static struct of_device_id ebony_of_bus[] = {
+        { .type = "ibm,plb", },
+        { .type = "ibm,opb", },
+        { .type = "ibm,ebc", },
+        {},
+};
+
+static int __init ebony_device_probe(void)
+{
+        if (!machine_is(ebony))
+                return 0;
+
+        of_platform_bus_probe(NULL, ebony_of_bus, NULL);
+
+        return 0;
+}
+device_initcall(ebony_device_probe);
+
+/*
+ * Called very early, MMU is off, device-tree isn't unflattened
+ */
+static int __init ebony_probe(void)
+{
+        unsigned long root = of_get_flat_dt_root();
+
+        if (!of_flat_dt_is_compatible(root, "ibm,ebony"))
+                return 0;
+
+        return 1;
+}
+
+static void __init ebony_setup_arch(void)
+{
+}
+
+define_machine(ebony) {
+        .name                   = "Ebony",
+        .probe                  = ebony_probe,
+        .setup_arch             = ebony_setup_arch,
+        .progress               = udbg_progress,
+        .init_IRQ               = uic_init_tree,
+        .get_irq                = uic_get_irq,
+        .restart                = ppc44x_reset_system,
+        .calibrate_decr         = generic_calibrate_decr,
+};