arch/powerpc/platforms/wsp/psr2.c

   1 /*
   2  * Copyright 2008-2011, IBM Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version
   7  * 2 of the License, or (at your option) any later version.
   8  */
   9
  10 #include <linux/delay.h>
  11 #include <linux/init.h>
  12 #include <linux/irq.h>
  13 #include <linux/kernel.h>
  14 #include <linux/mm.h>
  15 #include <linux/of.h>
  16 #include <linux/smp.h>
  17 #include <linux/time.h>
  18
  19 #include <asm/machdep.h>
  20 #include <asm/udbg.h>
  21
  22 #include "ics.h"
  23 #include "wsp.h"
  24
  25
  26 static void psr2_spin(void)
  27 {
  28         hard_irq_disable();
  29         for (;;)
  30                 continue;
  31 }
  32
  33 static void psr2_restart(char *cmd)
  34 {
  35         psr2_spin();
  36 }
  37
  38 static int __init psr2_probe(void)
  39 {
  40         unsigned long root = of_get_flat_dt_root();
  41
  42         if (of_flat_dt_is_compatible(root, "ibm,wsp-chroma")) {
  43                 /* chroma systems also claim they are psr2s */
  44                 return 0;
  45         }
  46
  47         if (!of_flat_dt_is_compatible(root, "ibm,psr2"))
  48                 return 0;
  49
  50         return 1;
  51 }
  52
  53 define_machine(psr2_md) {
  54         .name                   = "PSR2 A2",
  55         .probe                  = psr2_probe,
  56         .setup_arch             = wsp_setup_arch,
  57         .restart                = psr2_restart,
  58         .power_off              = psr2_spin,
  59         .halt                   = psr2_spin,
  60         .calibrate_decr         = generic_calibrate_decr,
  61         .init_IRQ               = wsp_setup_irq,
  62         .progress               = udbg_progress,
  63         .power_save             = book3e_idle,
  64 };
  65
  66 machine_arch_initcall(psr2_md, wsp_probe_devices);