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
  18 #include <asm/machdep.h>
  19 #include <asm/system.h>
  20 #include <asm/time.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 }
  32
  33 static void psr2_restart(char *cmd)
  34 {
  35         psr2_spin();
  36 }
  37
  38 static int psr2_probe_devices(void)
  39 {
  40         struct device_node *np;
  41
  42         /* Our RTC is a ds1500. It seems to be programatically compatible
  43          * with the ds1511 for which we have a driver so let's use that
  44          */
  45         np = of_find_compatible_node(NULL, NULL, "dallas,ds1500");
  46         if (np != NULL) {
  47                 struct resource res;
  48                 if (of_address_to_resource(np, 0, &res) == 0)
  49                         platform_device_register_simple("ds1511", 0, &res, 1);
  50         }
  51         return 0;
  52 }
  53 machine_arch_initcall(psr2_md, psr2_probe_devices);
  54
  55 static void __init psr2_setup_arch(void)
  56 {
  57         /* init to some ~sane value until calibrate_delay() runs */
  58         loops_per_jiffy = 50000000;
  59
  60         scom_init_wsp();
  61
  62         /* Setup SMP callback */
  63 #ifdef CONFIG_SMP
  64         a2_setup_smp();
  65 #endif
  66 }
  67
  68 static int __init psr2_probe(void)
  69 {
  70         unsigned long root = of_get_flat_dt_root();
  71
  72         if (!of_flat_dt_is_compatible(root, "ibm,psr2"))
  73                 return 0;
  74
  75         return 1;
  76 }
  77
  78 static void __init psr2_init_irq(void)
  79 {
  80         wsp_init_irq();
  81         opb_pic_init();
  82 }
  83
  84 define_machine(psr2_md) {
  85         .name                   = "PSR2 A2",
  86         .probe                  = psr2_probe,
  87         .setup_arch             = psr2_setup_arch,
  88         .restart                = psr2_restart,
  89         .power_off              = psr2_spin,
  90         .halt                   = psr2_spin,
  91         .calibrate_decr         = generic_calibrate_decr,
  92         .init_IRQ               = psr2_init_irq,
  93         .progress               = udbg_progress,
  94         .power_save             = book3e_idle,
  95 };