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/system.h>
  21 #include <asm/udbg.h>
  22
  23 #include "ics.h"
  24 #include "wsp.h"
  25
  26
  27 static void psr2_spin(void)
  28 {
  29         hard_irq_disable();
  30         for (;;)
  31                 continue;
  32 }
  33
  34 static void psr2_restart(char *cmd)
  35 {
  36         psr2_spin();
  37 }
  38
  39 static int __init psr2_probe(void)
  40 {
  41         unsigned long root = of_get_flat_dt_root();
  42
  43         if (of_flat_dt_is_compatible(root, "ibm,wsp-chroma")) {
  44                 /* chroma systems also claim they are psr2s */
  45                 return 0;
  46         }
  47
  48         if (!of_flat_dt_is_compatible(root, "ibm,psr2"))
  49                 return 0;
  50
  51         return 1;
  52 }
  53
  54 define_machine(psr2_md) {
  55         .name                   = "PSR2 A2",
  56         .probe                  = psr2_probe,
  57         .setup_arch             = wsp_setup_arch,
  58         .restart                = psr2_restart,
  59         .power_off              = psr2_spin,
  60         .halt                   = psr2_spin,
  61         .calibrate_decr         = generic_calibrate_decr,
  62         .init_IRQ               = wsp_setup_irq,
  63         .progress               = udbg_progress,
  64         .power_save             = book3e_idle,
  65 };
  66
  67 machine_arch_initcall(psr2_md, wsp_probe_devices);