[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>

arch/powerpc/boot/dts/lite5200.dts

@@ -19,7 +19,7 @@
 / {
 	model = "fsl,lite5200";
 	// revision = "1.0";
-	compatible = "fsl,lite5200","generic-mpc5200";
+	compatible = "fsl,lite5200";
 	#address-cells = <1>;
 	#size-cells = <1>;
 

arch/powerpc/boot/dts/lite5200b.dts

@@ -19,7 +19,7 @@
 / {
 	model = "fsl,lite5200b";
 	// revision = "1.0";
-	compatible = "fsl,lite5200b","generic-mpc5200";
+	compatible = "fsl,lite5200b";
 	#address-cells = <1>;
 	#size-cells = <1>;
 

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
-
-

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
 

arch/powerpc/platforms/52xx/mpc5200_simple.c

+/*
+ * 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,
+};