arch/powerpc/platforms/embedded6xx/gamecube.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * arch/powerpc/platforms/embedded6xx/gamecube.c
   4  *
   5  * Nintendo GameCube board-specific support
   6  * Copyright (C) 2004-2009 The GameCube Linux Team
   7  * Copyright (C) 2007,2008,2009 Albert Herranz
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <linux/irq.h>
  13 #include <linux/kexec.h>
  14 #include <linux/seq_file.h>
  15 #include <linux/of_platform.h>
  16
  17 #include <asm/io.h>
  18 #include <asm/machdep.h>
  19 #include <asm/time.h>
  20 #include <asm/udbg.h>
  21
  22 #include "flipper-pic.h"
  23 #include "usbgecko_udbg.h"
  24
  25
  26 static void __noreturn gamecube_spin(void)
  27 {
  28         /* spin until power button pressed */
  29         for (;;)
  30                 cpu_relax();
  31 }
  32
  33 static void __noreturn gamecube_restart(char *cmd)
  34 {
  35         local_irq_disable();
  36         flipper_platform_reset();
  37         gamecube_spin();
  38 }
  39
  40 static void gamecube_power_off(void)
  41 {
  42         local_irq_disable();
  43         gamecube_spin();
  44 }
  45
  46 static void __noreturn gamecube_halt(void)
  47 {
  48         gamecube_restart(NULL);
  49 }
  50
  51 static int __init gamecube_probe(void)
  52 {
  53         if (!of_machine_is_compatible("nintendo,gamecube"))
  54                 return 0;
  55
  56         pm_power_off = gamecube_power_off;
  57
  58         ug_udbg_init();
  59
  60         return 1;
  61 }
  62
  63 static void gamecube_shutdown(void)
  64 {
  65         flipper_quiesce();
  66 }
  67
  68 define_machine(gamecube) {
  69         .name                   = "gamecube",
  70         .probe                  = gamecube_probe,
  71         .restart                = gamecube_restart,
  72         .halt                   = gamecube_halt,
  73         .init_IRQ               = flipper_pic_probe,
  74         .get_irq                = flipper_pic_get_irq,
  75         .calibrate_decr         = generic_calibrate_decr,
  76         .progress               = udbg_progress,
  77         .machine_shutdown       = gamecube_shutdown,
  78 };
  79
  80
  81 static const struct of_device_id gamecube_of_bus[] = {
  82         { .compatible = "nintendo,flipper", },
  83         { },
  84 };
  85
  86 static int __init gamecube_device_probe(void)
  87 {
  88         if (!machine_is(gamecube))
  89                 return 0;
  90
  91         of_platform_bus_probe(NULL, gamecube_of_bus, NULL);
  92         return 0;
  93 }
  94 device_initcall(gamecube_device_probe);
  95