linux/arch/powerpc/platforms/embedded6xx/wii.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * arch/powerpc/platforms/embedded6xx/wii.c
   4 *
   5 * Nintendo Wii board-specific support
   6 * Copyright (C) 2008-2009 The GameCube Linux Team
   7 * Copyright (C) 2008,2009 Albert Herranz
   8 */
   9#define DRV_MODULE_NAME "wii"
  10#define pr_fmt(fmt) DRV_MODULE_NAME ": " fmt
  11
  12#include <linux/kernel.h>
  13#include <linux/init.h>
  14#include <linux/irq.h>
  15#include <linux/seq_file.h>
  16#include <linux/of_platform.h>
  17#include <linux/memblock.h>
  18#include <mm/mmu_decl.h>
  19
  20#include <asm/io.h>
  21#include <asm/machdep.h>
  22#include <asm/prom.h>
  23#include <asm/time.h>
  24#include <asm/udbg.h>
  25
  26#include "flipper-pic.h"
  27#include "hlwd-pic.h"
  28#include "usbgecko_udbg.h"
  29
  30/* control block */
  31#define HW_CTRL_COMPATIBLE      "nintendo,hollywood-control"
  32
  33#define HW_CTRL_RESETS          0x94
  34#define HW_CTRL_RESETS_SYS      (1<<0)
  35
  36/* gpio */
  37#define HW_GPIO_COMPATIBLE      "nintendo,hollywood-gpio"
  38
  39#define HW_GPIO_BASE(idx)       (idx * 0x20)
  40#define HW_GPIO_OUT(idx)        (HW_GPIO_BASE(idx) + 0)
  41#define HW_GPIO_DIR(idx)        (HW_GPIO_BASE(idx) + 4)
  42#define HW_GPIO_OWNER           (HW_GPIO_BASE(1) + 0x1c)
  43
  44#define HW_GPIO_SHUTDOWN        (1<<1)
  45#define HW_GPIO_SLOT_LED        (1<<5)
  46#define HW_GPIO_SENSOR_BAR      (1<<8)
  47
  48
  49static void __iomem *hw_ctrl;
  50static void __iomem *hw_gpio;
  51
  52static int __init page_aligned(unsigned long x)
  53{
  54        return !(x & (PAGE_SIZE-1));
  55}
  56
  57void __init wii_memory_fixups(void)
  58{
  59        struct memblock_region *p = memblock.memory.regions;
  60
  61        BUG_ON(memblock.memory.cnt != 2);
  62        BUG_ON(!page_aligned(p[0].base) || !page_aligned(p[1].base));
  63}
  64
  65static void __noreturn wii_spin(void)
  66{
  67        local_irq_disable();
  68        for (;;)
  69                cpu_relax();
  70}
  71
  72static void __iomem *wii_ioremap_hw_regs(char *name, char *compatible)
  73{
  74        void __iomem *hw_regs = NULL;
  75        struct device_node *np;
  76        struct resource res;
  77        int error = -ENODEV;
  78
  79        np = of_find_compatible_node(NULL, NULL, compatible);
  80        if (!np) {
  81                pr_err("no compatible node found for %s\n", compatible);
  82                goto out;
  83        }
  84        error = of_address_to_resource(np, 0, &res);
  85        if (error) {
  86                pr_err("no valid reg found for %pOFn\n", np);
  87                goto out_put;
  88        }
  89
  90        hw_regs = ioremap(res.start, resource_size(&res));
  91        if (hw_regs) {
  92                pr_info("%s at 0x%08x mapped to 0x%p\n", name,
  93                        res.start, hw_regs);
  94        }
  95
  96out_put:
  97        of_node_put(np);
  98out:
  99        return hw_regs;
 100}
 101
 102static void __init wii_setup_arch(void)
 103{
 104        hw_ctrl = wii_ioremap_hw_regs("hw_ctrl", HW_CTRL_COMPATIBLE);
 105        hw_gpio = wii_ioremap_hw_regs("hw_gpio", HW_GPIO_COMPATIBLE);
 106        if (hw_gpio) {
 107                /* turn off the front blue led and IR light */
 108                clrbits32(hw_gpio + HW_GPIO_OUT(0),
 109                          HW_GPIO_SLOT_LED | HW_GPIO_SENSOR_BAR);
 110        }
 111}
 112
 113static void __noreturn wii_restart(char *cmd)
 114{
 115        local_irq_disable();
 116
 117        if (hw_ctrl) {
 118                /* clear the system reset pin to cause a reset */
 119                clrbits32(hw_ctrl + HW_CTRL_RESETS, HW_CTRL_RESETS_SYS);
 120        }
 121        wii_spin();
 122}
 123
 124static void wii_power_off(void)
 125{
 126        local_irq_disable();
 127
 128        if (hw_gpio) {
 129                /*
 130                 * set the owner of the shutdown pin to ARM, because it is
 131                 * accessed through the registers for the ARM, below
 132                 */
 133                clrbits32(hw_gpio + HW_GPIO_OWNER, HW_GPIO_SHUTDOWN);
 134
 135                /* make sure that the poweroff GPIO is configured as output */
 136                setbits32(hw_gpio + HW_GPIO_DIR(1), HW_GPIO_SHUTDOWN);
 137
 138                /* drive the poweroff GPIO high */
 139                setbits32(hw_gpio + HW_GPIO_OUT(1), HW_GPIO_SHUTDOWN);
 140        }
 141        wii_spin();
 142}
 143
 144static void __noreturn wii_halt(void)
 145{
 146        if (ppc_md.restart)
 147                ppc_md.restart(NULL);
 148        wii_spin();
 149}
 150
 151static void __init wii_pic_probe(void)
 152{
 153        flipper_pic_probe();
 154        hlwd_pic_probe();
 155}
 156
 157static int __init wii_probe(void)
 158{
 159        if (!of_machine_is_compatible("nintendo,wii"))
 160                return 0;
 161
 162        pm_power_off = wii_power_off;
 163
 164        ug_udbg_init();
 165
 166        return 1;
 167}
 168
 169static void wii_shutdown(void)
 170{
 171        hlwd_quiesce();
 172        flipper_quiesce();
 173}
 174
 175static const struct of_device_id wii_of_bus[] = {
 176        { .compatible = "nintendo,hollywood", },
 177        { },
 178};
 179
 180static int __init wii_device_probe(void)
 181{
 182        if (!machine_is(wii))
 183                return 0;
 184
 185        of_platform_populate(NULL, wii_of_bus, NULL, NULL);
 186        return 0;
 187}
 188device_initcall(wii_device_probe);
 189
 190define_machine(wii) {
 191        .name                   = "wii",
 192        .probe                  = wii_probe,
 193        .setup_arch             = wii_setup_arch,
 194        .restart                = wii_restart,
 195        .halt                   = wii_halt,
 196        .init_IRQ               = wii_pic_probe,
 197        .get_irq                = flipper_pic_get_irq,
 198        .calibrate_decr         = generic_calibrate_decr,
 199        .progress               = udbg_progress,
 200        .machine_shutdown       = wii_shutdown,
 201};
 202