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/prom.h>
  20 #include <asm/time.h>
  21 #include <asm/udbg.h>
  22
  23 #include "flipper-pic.h"
  24 #include "usbgecko_udbg.h"
  25
  26
  27 static void __noreturn gamecube_spin(void)
  28 {
  29         /* spin until power button pressed */
  30         for (;;)
  31                 cpu_relax();
  32 }
  33
  34 static void __noreturn gamecube_restart(char *cmd)
  35 {
  36         local_irq_disable();
  37         flipper_platform_reset();
  38         gamecube_spin();
  39 }
  40
  41 static void gamecube_power_off(void)
  42 {
  43         local_irq_disable();
  44         gamecube_spin();
  45 }
  46
  47 static void __noreturn gamecube_halt(void)
  48 {
  49         gamecube_restart(NULL);
  50 }
  51
  52 static int __init gamecube_probe(void)
  53 {
  54         if (!of_machine_is_compatible("nintendo,gamecube"))
  55                 return 0;
  56
  57         pm_power_off = gamecube_power_off;
  58
  59         ug_udbg_init();
  60
  61         return 1;
  62 }
  63
  64 static void gamecube_shutdown(void)
  65 {
  66         flipper_quiesce();
  67 }
  68
  69 define_machine(gamecube) {
  70         .name                   = "gamecube",
  71         .probe                  = gamecube_probe,
  72         .restart                = gamecube_restart,
  73         .halt                   = gamecube_halt,
  74         .init_IRQ               = flipper_pic_probe,
  75         .get_irq                = flipper_pic_get_irq,
  76         .calibrate_decr         = generic_calibrate_decr,
  77         .progress               = udbg_progress,
  78         .machine_shutdown       = gamecube_shutdown,
  79 };
  80
  81
  82 static const struct of_device_id gamecube_of_bus[] = {
  83         { .compatible = "nintendo,flipper", },
  84         { },
  85 };
  86
  87 static int __init gamecube_device_probe(void)
  88 {
  89         if (!machine_is(gamecube))
  90                 return 0;
  91
  92         of_platform_bus_probe(NULL, gamecube_of_bus, NULL);
  93         return 0;
  94 }
  95 device_initcall(gamecube_device_probe);
  96