powerpc: wii: platform support

Add platform support for the Nintendo Wii video game console.
Signed-off-by: Albert Herranz <albert_herranz@yahoo.es>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Segher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

arch/powerpc/platforms/embedded6xx/Kconfig

@@ -115,3 +115,11 @@ config GAMECUBE
 	  Select GAMECUBE if configuring for the Nintendo GameCube.
 	  More information at: <http://gc-linux.sourceforge.net/>
 
+config WII
+	bool "Nintendo-Wii"
+	depends on EMBEDDED6xx
+	select GAMECUBE_COMMON
+	help
+	  Select WII if configuring for the Nintendo Wii.
+	  More information at: <http://gc-linux.sourceforge.net/>
+

arch/powerpc/platforms/embedded6xx/Makefile

@@ -10,4 +10,4 @@ obj-$(CONFIG_PPC_C2K)		+= c2k.o
 obj-$(CONFIG_USBGECKO_UDBG)	+= usbgecko_udbg.o
 obj-$(CONFIG_GAMECUBE_COMMON)	+= flipper-pic.o
 obj-$(CONFIG_GAMECUBE)		+= gamecube.o
-obj-$(CONFIG_WII)		+= hlwd-pic.o
+obj-$(CONFIG_WII)		+= wii.o hlwd-pic.o

arch/powerpc/platforms/embedded6xx/wii.c

+/*
+ * arch/powerpc/platforms/embedded6xx/wii.c
+ *
+ * Nintendo Wii board-specific support
+ * Copyright (C) 2008-2009 The GameCube Linux Team
+ * Copyright (C) 2008,2009 Albert Herranz
+ *
+ * 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.
+ *
+ */
+#define DRV_MODULE_NAME "wii"
+#define pr_fmt(fmt) DRV_MODULE_NAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/seq_file.h>
+#include <linux/kexec.h>
+#include <linux/of_platform.h>
+
+#include <asm/io.h>
+#include <asm/machdep.h>
+#include <asm/prom.h>
+#include <asm/time.h>
+#include <asm/udbg.h>
+
+#include "flipper-pic.h"
+#include "hlwd-pic.h"
+#include "usbgecko_udbg.h"
+
+/* control block */
+#define HW_CTRL_COMPATIBLE	"nintendo,hollywood-control"
+
+#define HW_CTRL_RESETS		0x94
+#define HW_CTRL_RESETS_SYS	(1<<0)
+
+/* gpio */
+#define HW_GPIO_COMPATIBLE	"nintendo,hollywood-gpio"
+
+#define HW_GPIO_BASE(idx)	(idx * 0x20)
+#define HW_GPIO_OUT(idx)	(HW_GPIO_BASE(idx) + 0)
+#define HW_GPIO_DIR(idx)	(HW_GPIO_BASE(idx) + 4)
+
+#define HW_GPIO_SHUTDOWN	(1<<1)
+#define HW_GPIO_SLOT_LED	(1<<5)
+#define HW_GPIO_SENSOR_BAR	(1<<8)
+
+
+static void __iomem *hw_ctrl;
+static void __iomem *hw_gpio;
+
+static void wii_spin(void)
+{
+	local_irq_disable();
+	for (;;)
+		cpu_relax();
+}
+
+static void __iomem *wii_ioremap_hw_regs(char *name, char *compatible)
+{
+	void __iomem *hw_regs = NULL;
+	struct device_node *np;
+	struct resource res;
+	int error = -ENODEV;
+
+	np = of_find_compatible_node(NULL, NULL, compatible);
+	if (!np) {
+		pr_err("no compatible node found for %s\n", compatible);
+		goto out;
+	}
+	error = of_address_to_resource(np, 0, &res);
+	if (error) {
+		pr_err("no valid reg found for %s\n", np->name);
+		goto out_put;
+	}
+
+	hw_regs = ioremap(res.start, resource_size(&res));
+	if (hw_regs) {
+		pr_info("%s at 0x%08x mapped to 0x%p\n", name,
+			res.start, hw_regs);
+	}
+
+out_put:
+	of_node_put(np);
+out:
+	return hw_regs;
+}
+
+static void __init wii_setup_arch(void)
+{
+	hw_ctrl = wii_ioremap_hw_regs("hw_ctrl", HW_CTRL_COMPATIBLE);
+	hw_gpio = wii_ioremap_hw_regs("hw_gpio", HW_GPIO_COMPATIBLE);
+	if (hw_gpio) {
+		/* turn off the front blue led and IR light */
+		clrbits32(hw_gpio + HW_GPIO_OUT(0),
+			  HW_GPIO_SLOT_LED | HW_GPIO_SENSOR_BAR);
+	}
+}
+
+static void wii_restart(char *cmd)
+{
+	local_irq_disable();
+
+	if (hw_ctrl) {
+		/* clear the system reset pin to cause a reset */
+		clrbits32(hw_ctrl + HW_CTRL_RESETS, HW_CTRL_RESETS_SYS);
+	}
+	wii_spin();
+}
+
+static void wii_power_off(void)
+{
+	local_irq_disable();
+
+	if (hw_gpio) {
+		/* make sure that the poweroff GPIO is configured as output */
+		setbits32(hw_gpio + HW_GPIO_DIR(1), HW_GPIO_SHUTDOWN);
+
+		/* drive the poweroff GPIO high */
+		setbits32(hw_gpio + HW_GPIO_OUT(1), HW_GPIO_SHUTDOWN);
+	}
+	wii_spin();
+}
+
+static void wii_halt(void)
+{
+	if (ppc_md.restart)
+		ppc_md.restart(NULL);
+	wii_spin();
+}
+
+static void __init wii_init_early(void)
+{
+	ug_udbg_init();
+}
+
+static void __init wii_pic_probe(void)
+{
+	flipper_pic_probe();
+	hlwd_pic_probe();
+}
+
+static int __init wii_probe(void)
+{
+	unsigned long dt_root;
+
+	dt_root = of_get_flat_dt_root();
+	if (!of_flat_dt_is_compatible(dt_root, "nintendo,wii"))
+		return 0;
+
+	return 1;
+}
+
+static void wii_shutdown(void)
+{
+	hlwd_quiesce();
+	flipper_quiesce();
+}
+
+#ifdef CONFIG_KEXEC
+static int wii_machine_kexec_prepare(struct kimage *image)
+{
+	return 0;
+}
+#endif /* CONFIG_KEXEC */
+
+define_machine(wii) {
+	.name			= "wii",
+	.probe			= wii_probe,
+	.init_early		= wii_init_early,
+	.setup_arch		= wii_setup_arch,
+	.restart		= wii_restart,
+	.power_off		= wii_power_off,
+	.halt			= wii_halt,
+	.init_IRQ		= wii_pic_probe,
+	.get_irq		= flipper_pic_get_irq,
+	.calibrate_decr		= generic_calibrate_decr,
+	.progress		= udbg_progress,
+	.machine_shutdown	= wii_shutdown,
+#ifdef CONFIG_KEXEC
+	.machine_kexec_prepare	= wii_machine_kexec_prepare,
+#endif
+};
+
+static struct of_device_id wii_of_bus[] = {
+	{ .compatible = "nintendo,hollywood", },
+	{ },
+};
+
+static int __init wii_device_probe(void)
+{
+	if (!machine_is(wii))
+		return 0;
+
+	of_platform_bus_probe(NULL, wii_of_bus, NULL);
+	return 0;
+}
+device_initcall(wii_device_probe);
+