// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * 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
 */
#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/of_platform.h>
#include <linux/memblock.h>
#include <mm/mmu_decl.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_OWNER           (HW_GPIO_BASE(1) + 0x1c)

#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 int __init page_aligned(unsigned long x)
{
        return !(x & (PAGE_SIZE-1));
}

void __init wii_memory_fixups(void)
{
        struct memblock_region *p = memblock.memory.regions;

        BUG_ON(memblock.memory.cnt != 2);
        BUG_ON(!page_aligned(p[0].base) || !page_aligned(p[1].base));
}

static void __noreturn 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 %pOFn\n", np);
                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 __noreturn 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) {
                /*
                 * set the owner of the shutdown pin to ARM, because it is
                 * accessed through the registers for the ARM, below
                 */
                clrbits32(hw_gpio + HW_GPIO_OWNER, HW_GPIO_SHUTDOWN);

                /* 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 __noreturn wii_halt(void)
{
        if (ppc_md.restart)
                ppc_md.restart(NULL);
        wii_spin();
}

static void __init wii_pic_probe(void)
{
        flipper_pic_probe();
        hlwd_pic_probe();
}

static int __init wii_probe(void)
{
        if (!of_machine_is_compatible("nintendo,wii"))
                return 0;

        pm_power_off = wii_power_off;

        ug_udbg_init();

        return 1;
}

static void wii_shutdown(void)
{
        hlwd_quiesce();
        flipper_quiesce();
}

define_machine(wii) {
        .name                   = "wii",
        .probe                  = wii_probe,
        .setup_arch             = wii_setup_arch,
        .restart                = wii_restart,
        .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,
};

static const 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_populate(NULL, wii_of_bus, NULL, NULL);
        return 0;
}
device_initcall(wii_device_probe);