arch/powerpc/platforms/40x/walnut.c

   1 /*
   2  * Architecture- / platform-specific boot-time initialization code for
   3  * IBM PowerPC 4xx based boards. Adapted from original
   4  * code by Gary Thomas, Cort Dougan <cort@fsmlabs.com>, and Dan Malek
   5  * <dan@net4x.com>.
   6  *
   7  * Copyright(c) 1999-2000 Grant Erickson <grant@lcse.umn.edu>
   8  *
   9  * Rewritten and ported to the merged powerpc tree:
  10  * Copyright 2007 IBM Corporation
  11  * Josh Boyer <jwboyer@linux.vnet.ibm.com>
  12  *
  13  * 2002 (c) MontaVista, Software, Inc.  This file is licensed under
  14  * the terms of the GNU General Public License version 2.  This program
  15  * is licensed "as is" without any warranty of any kind, whether express
  16  * or implied.
  17  */
  18
  19 #include <linux/init.h>
  20 #include <linux/of_platform.h>
  21
  22 #include <asm/machdep.h>
  23 #include <asm/prom.h>
  24 #include <asm/udbg.h>
  25 #include <asm/time.h>
  26 #include <asm/uic.h>
  27
  28 static struct of_device_id walnut_of_bus[] = {
  29         { .compatible = "ibm,plb3", },
  30         { .compatible = "ibm,opb", },
  31         { .compatible = "ibm,ebc", },
  32         {},
  33 };
  34
  35 static int __init walnut_device_probe(void)
  36 {
  37         if (!machine_is(walnut))
  38                 return 0;
  39
  40         /* FIXME: do bus probe here */
  41         of_platform_bus_probe(NULL, walnut_of_bus, NULL);
  42
  43         return 0;
  44 }
  45 device_initcall(walnut_device_probe);
  46
  47 static int __init walnut_probe(void)
  48 {
  49         unsigned long root = of_get_flat_dt_root();
  50
  51         if (!of_flat_dt_is_compatible(root, "ibm,walnut"))
  52                 return 0;
  53
  54         return 1;
  55 }
  56
  57 define_machine(walnut) {
  58         .name                   = "Walnut",
  59         .probe                  = walnut_probe,
  60         .progress               = udbg_progress,
  61         .init_IRQ               = uic_init_tree,
  62         .get_irq                = uic_get_irq,
  63         .calibrate_decr = generic_calibrate_decr,
  64 };