arch/powerpc/platforms/44x/ppc44x_simple.c

   1 /*
   2  * Generic PowerPC 44x platform support
   3  *
   4  * Copyright 2008 IBM Corporation
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; version 2 of the License.
   9  *
  10  * This implements simple platform support for PowerPC 44x chips.  This is
  11  * mostly used for eval boards or other simple and "generic" 44x boards.  If
  12  * your board has custom functions or hardware, then you will likely want to
  13  * implement your own board.c file to accommodate it.
  14  */
  15
  16 #include <asm/machdep.h>
  17 #include <asm/pci-bridge.h>
  18 #include <asm/ppc4xx.h>
  19 #include <asm/prom.h>
  20 #include <asm/time.h>
  21 #include <asm/udbg.h>
  22 #include <asm/uic.h>
  23
  24 #include <linux/init.h>
  25 #include <linux/of_platform.h>
  26
  27 static __initdata struct of_device_id ppc44x_of_bus[] = {
  28         { .compatible = "ibm,plb4", },
  29         { .compatible = "ibm,opb", },
  30         { .compatible = "ibm,ebc", },
  31         { .compatible = "simple-bus", },
  32         {},
  33 };
  34
  35 static int __init ppc44x_device_probe(void)
  36 {
  37         of_platform_bus_probe(NULL, ppc44x_of_bus, NULL);
  38
  39         return 0;
  40 }
  41 machine_device_initcall(ppc44x_simple, ppc44x_device_probe);
  42
  43 /* This is the list of boards that can be supported by this simple
  44  * platform code.  This does _not_ mean the boards are compatible,
  45  * as they most certainly are not from a device tree perspective.
  46  * However, their differences are handled by the device tree and the
  47  * drivers and therefore they don't need custom board support files.
  48  *
  49  * Again, if your board needs to do things differently then create a
  50  * board.c file for it rather than adding it to this list.
  51  */
  52 static char *board[] __initdata = {
  53         "amcc,arches",
  54         "amcc,bamboo",
  55         "amcc,canyonlands",
  56         "amcc,glacier",
  57         "ibm,ebony",
  58         "amcc,katmai",
  59         "amcc,rainier",
  60         "amcc,sequoia",
  61         "amcc,taishan",
  62         "amcc,yosemite"
  63 };
  64
  65 static int __init ppc44x_probe(void)
  66 {
  67         unsigned long root = of_get_flat_dt_root();
  68         int i = 0;
  69
  70         for (i = 0; i < ARRAY_SIZE(board); i++) {
  71                 if (of_flat_dt_is_compatible(root, board[i])) {
  72                         ppc_pci_flags = PPC_PCI_REASSIGN_ALL_RSRC;
  73                         return 1;
  74                 }
  75         }
  76
  77         return 0;
  78 }
  79
  80 define_machine(ppc44x_simple) {
  81         .name = "PowerPC 44x Platform",
  82         .probe = ppc44x_probe,
  83         .progress = udbg_progress,
  84         .init_IRQ = uic_init_tree,
  85         .get_irq = uic_get_irq,
  86         .restart = ppc4xx_reset_system,
  87         .calibrate_decr = generic_calibrate_decr,
  88 };