wii.c

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/*
 * 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/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_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;

unsigned long wii_hole_start;
unsigned long wii_hole_size;


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;

    /*
     * This is part of a workaround to allow the use of two
     * discontinuous RAM ranges on the Wii, even if this is
     * currently unsupported on 32-bit PowerPC Linux.
     *
     * We coalesce the two memory ranges of the Wii into a
     * single range, then create a reservation for the "hole"
     * between both ranges.
     */

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

    /* trim unaligned tail */
    memblock_remove(ALIGN(p[1].base + p[1].size, PAGE_SIZE),
            (phys_addr_t)ULLONG_MAX);

    /* determine hole, add & reserve them */
    wii_hole_start = ALIGN(p[0].base + p[0].size, PAGE_SIZE);
    wii_hole_size = p[1].base - wii_hole_start;
    memblock_add(wii_hole_start, wii_hole_size);
    memblock_reserve(wii_hole_start, wii_hole_size);

    BUG_ON(memblock.memory.cnt != 1);
    __memblock_dump_all();

    /* allow ioremapping the address space in the hole */
    __allow_ioremap_reserved = 1;
}

unsigned long __init wii_mmu_mapin_mem2(unsigned long top)
{
    unsigned long delta, size, bl;
    unsigned long max_size = (256<<20);

    /* MEM2 64MB@0x10000000 */
    delta = wii_hole_start + wii_hole_size;
    size = top - delta;
    for (bl = 128<<10; bl < max_size; bl <<= 1) {
        if (bl * 2 > size)
            break;
    }
    setbat(4, PAGE_OFFSET+delta, delta, bl, PAGE_KERNEL_X);
    return delta + bl;
}

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();
}

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,
};

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);