release/src-rt-6.x.4708/linux/linux-2.6.36/arch/powerpc/platforms/embedded6xx/gamecube.c

   1 /*
   2  * arch/powerpc/platforms/embedded6xx/gamecube.c
   3  *
   4  * Nintendo GameCube board-specific support
   5  * Copyright (C) 2004-2009 The GameCube Linux Team
   6  * Copyright (C) 2007,2008,2009 Albert Herranz
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * as published by the Free Software Foundation; either version 2
  11  * of the License, or (at your option) any later version.
  12  *
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/irq.h>
  18 #include <linux/kexec.h>
  19 #include <linux/seq_file.h>
  20 #include <linux/of_platform.h>
  21
  22 #include <asm/io.h>
  23 #include <asm/machdep.h>
  24 #include <asm/prom.h>
  25 #include <asm/time.h>
  26 #include <asm/udbg.h>
  27
  28 #include "flipper-pic.h"
  29 #include "usbgecko_udbg.h"
  30
  31
  32 static void gamecube_spin(void)
  33 {
  34         /* spin until power button pressed */
  35         for (;;)
  36                 cpu_relax();
  37 }
  38
  39 static void gamecube_restart(char *cmd)
  40 {
  41         local_irq_disable();
  42         flipper_platform_reset();
  43         gamecube_spin();
  44 }
  45
  46 static void gamecube_power_off(void)
  47 {
  48         local_irq_disable();
  49         gamecube_spin();
  50 }
  51
  52 static void gamecube_halt(void)
  53 {
  54         gamecube_restart(NULL);
  55 }
  56
  57 static void __init gamecube_init_early(void)
  58 {
  59         ug_udbg_init();
  60 }
  61
  62 static int __init gamecube_probe(void)
  63 {
  64         unsigned long dt_root;
  65
  66         dt_root = of_get_flat_dt_root();
  67         if (!of_flat_dt_is_compatible(dt_root, "nintendo,gamecube"))
  68                 return 0;
  69
  70         return 1;
  71 }
  72
  73 static void gamecube_shutdown(void)
  74 {
  75         flipper_quiesce();
  76 }
  77
  78 #ifdef CONFIG_KEXEC
  79 static int gamecube_kexec_prepare(struct kimage *image)
  80 {
  81         return 0;
  82 }
  83 #endif /* CONFIG_KEXEC */
  84
  85
  86 define_machine(gamecube) {
  87         .name                   = "gamecube",
  88         .probe                  = gamecube_probe,
  89         .init_early             = gamecube_init_early,
  90         .restart                = gamecube_restart,
  91         .power_off              = gamecube_power_off,
  92         .halt                   = gamecube_halt,
  93         .init_IRQ               = flipper_pic_probe,
  94         .get_irq                = flipper_pic_get_irq,
  95         .calibrate_decr         = generic_calibrate_decr,
  96         .progress               = udbg_progress,
  97         .machine_shutdown       = gamecube_shutdown,
  98 #ifdef CONFIG_KEXEC
  99         .machine_kexec_prepare  = gamecube_kexec_prepare,
 100 #endif
 101 };
 102
 103
 104 static struct of_device_id gamecube_of_bus[] = {
 105         { .compatible = "nintendo,flipper", },
 106         { },
 107 };
 108
 109 static int __init gamecube_device_probe(void)
 110 {
 111         if (!machine_is(gamecube))
 112                 return 0;
 113
 114         of_platform_bus_probe(NULL, gamecube_of_bus, NULL);
 115         return 0;
 116 }
 117 device_initcall(gamecube_device_probe);