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>

1 files changed, 202 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/embedded6xx/wii.c b/arch/powerpc/platforms/embedded6xx/wii.c
new file mode 100644
index 000000000000..1bd41cc8039d
--- /dev/null
+++ b/arch/powerpc/platforms/embedded6xx/wii.c
@@ -0,0 +1,202 @@
+/*
+ * 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);
+