[POWERPC] mpc5200: Add generic support for simple MPC5200 based boards

This patch adds support for 'mpc5200-simple-platform' compatible
boards which do not need a platform specific setup. Such boards
are supported assuming the following:

- GPIO pins are configured by the firmware,
- CDM configuration (clocking) is setup correctly by firmware,
- if the 'fsl,has-wdt' property is present in one of the
  gpt nodes, then it is safe to use such gpt to reset the board,
- PCI is supported if enabled in the kernel configuration
  and if there is a PCI bus node defined in the device tree.

Signed-off-by: Marian Balakowicz <m8@semihalf.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

3 files changed, 110 insertions, 3 deletions

diff --git a/arch/powerpc/platforms/52xx/Kconfig b/arch/powerpc/platforms/52xx/Kconfig
index 2938d4927b83..733a8063d400 100644
--- a/arch/powerpc/platforms/52xx/Kconfig
+++ b/arch/powerpc/platforms/52xx/Kconfig
@@ -19,6 +19,28 @@ config PPC_MPC5200_BUGFIX
 
           It is safe to say 'Y' here
 
+config PPC_MPC5200_SIMPLE
+        bool "Generic support for simple MPC5200 based boards"
+        depends on PPC_MULTIPLATFORM && PPC32
+        select PPC_MPC5200
+        select DEFAULT_UIMAGE
+        select WANT_DEVICE_TREE
+        default n
+        help
+          This option enables support for a simple MPC52xx based boards which
+          do not need a custom platform specific setup. Such boards are
+          supported assuming the following:
+
+          - GPIO pins are configured by the firmware,
+          - CDM configuration (clocking) is setup correctly by firmware,
+          - if the 'fsl,has-wdt' property is present in one of the
+            gpt nodes, then it is safe to use such gpt to reset the board,
+          - PCI is supported if enabled in the kernel configuration
+            and if there is a PCI bus node defined in the device tree.
+
+          Boards that are compatible with this generic platform support
+          are: 'tqc,tqm5200', 'promess,motionpro', 'schindler,cm5200'.
+
 config PPC_EFIKA
         bool "bPlan Efika 5k2. MPC5200B based computer"
         depends on PPC_MULTIPLATFORM && PPC32
@@ -31,8 +53,7 @@ config PPC_EFIKA
 config PPC_LITE5200
         bool "Freescale Lite5200 Eval Board"
         depends on PPC_MULTIPLATFORM && PPC32
-        select WANT_DEVICE_TREE
         select PPC_MPC5200
+        select DEFAULT_UIMAGE
+        select WANT_DEVICE_TREE
         default n
-
-
diff --git a/arch/powerpc/platforms/52xx/Makefile b/arch/powerpc/platforms/52xx/Makefile
index 307dbc178091..fe1b81bb5224 100644
--- a/arch/powerpc/platforms/52xx/Makefile
+++ b/arch/powerpc/platforms/52xx/Makefile
@@ -6,6 +6,7 @@ obj-y				+= mpc52xx_pic.o mpc52xx_common.o
 obj-$(CONFIG_PCI)               += mpc52xx_pci.o
 endif
 
+obj-$(CONFIG_PPC_MPC5200_SIMPLE) += mpc5200_simple.o
 obj-$(CONFIG_PPC_EFIKA)         += efika.o
 obj-$(CONFIG_PPC_LITE5200)      += lite5200.o
 
diff --git a/arch/powerpc/platforms/52xx/mpc5200_simple.c b/arch/powerpc/platforms/52xx/mpc5200_simple.c
new file mode 100644
index 000000000000..754aa932f595
--- /dev/null
+++ b/arch/powerpc/platforms/52xx/mpc5200_simple.c
@@ -0,0 +1,85 @@
+/*
+ * Support for 'mpc5200-simple-platform' compatible boards.
+ *
+ * Written by Marian Balakowicz <m8@semihalf.com>
+ * Copyright (C) 2007 Semihalf
+ *
+ * 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.
+ *
+ * Description:
+ * This code implements support for a simple MPC52xx based boards which
+ * do not need a custom platform specific setup. Such boards are
+ * supported assuming the following:
+ *
+ * - GPIO pins are configured by the firmware,
+ * - CDM configuration (clocking) is setup correctly by firmware,
+ * - if the 'fsl,has-wdt' property is present in one of the
+ *   gpt nodes, then it is safe to use such gpt to reset the board,
+ * - PCI is supported if enabled in the kernel configuration
+ *   and if there is a PCI bus node defined in the device tree.
+ *
+ * Boards that are compatible with this generic platform support
+ * are listed in a 'board' table.
+ */
+
+#undef DEBUG
+#include <asm/time.h>
+#include <asm/prom.h>
+#include <asm/machdep.h>
+#include <asm/mpc52xx.h>
+
+/*
+ * Setup the architecture
+ */
+static void __init mpc5200_simple_setup_arch(void)
+{
+        if (ppc_md.progress)
+                ppc_md.progress("mpc5200_simple_setup_arch()", 0);
+
+        /* Some mpc5200 & mpc5200b related configuration */
+        mpc5200_setup_xlb_arbiter();
+
+        /* Map wdt for mpc52xx_restart() */
+        mpc52xx_map_wdt();
+
+        mpc52xx_setup_pci();
+}
+
+/* list of the supported boards */
+static char *board[] __initdata = {
+        "promess,motionpro",
+        "schindler,cm5200",
+        "tqc,tqm5200",
+        NULL
+};
+
+/*
+ * Called very early, MMU is off, device-tree isn't unflattened
+ */
+static int __init mpc5200_simple_probe(void)
+{
+        unsigned long node = of_get_flat_dt_root();
+        int i = 0;
+
+        while (board[i]) {
+                if (of_flat_dt_is_compatible(node, board[i]))
+                        break;
+                i++;
+        }
+        
+        return (board[i] != NULL);
+}
+
+define_machine(mpc5200_simple_platform) {
+        .name           = "mpc5200-simple-platform",
+        .probe          = mpc5200_simple_probe,
+        .setup_arch     = mpc5200_simple_setup_arch,
+        .init           = mpc52xx_declare_of_platform_devices,
+        .init_IRQ       = mpc52xx_init_irq,
+        .get_irq        = mpc52xx_get_irq,
+        .restart        = mpc52xx_restart,
+        .calibrate_decr = generic_calibrate_decr,
+};