arch/powerpc/platforms/52xx/mpc5200_simple.c

   1 /*
   2  * Support for 'mpc5200-simple-platform' compatible boards.
   3  *
   4  * Written by Marian Balakowicz <m8@semihalf.com>
   5  * Copyright (C) 2007 Semihalf
   6  *
   7  * This program is free software; you can redistribute  it and/or modify it
   8  * under  the terms of  the GNU General  Public License as published by the
   9  * Free Software Foundation;  either version 2 of the  License, or (at your
  10  * option) any later version.
  11  *
  12  * Description:
  13  * This code implements support for a simple MPC52xx based boards which
  14  * do not need a custom platform specific setup. Such boards are
  15  * supported assuming the following:
  16  *
  17  * - GPIO pins are configured by the firmware,
  18  * - CDM configuration (clocking) is setup correctly by firmware,
  19  * - if the 'fsl,has-wdt' property is present in one of the
  20  *   gpt nodes, then it is safe to use such gpt to reset the board,
  21  * - PCI is supported if enabled in the kernel configuration
  22  *   and if there is a PCI bus node defined in the device tree.
  23  *
  24  * Boards that are compatible with this generic platform support
  25  * are listed in a 'board' table.
  26  */
  27
  28 #undef DEBUG
  29 #include <asm/time.h>
  30 #include <asm/prom.h>
  31 #include <asm/machdep.h>
  32 #include <asm/mpc52xx.h>
  33
  34 /*
  35  * Setup the architecture
  36  */
  37 static void __init mpc5200_simple_setup_arch(void)
  38 {
  39         if (ppc_md.progress)
  40                 ppc_md.progress("mpc5200_simple_setup_arch()", 0);
  41
  42         /* Map important registers from the internal memory map */
  43         mpc52xx_map_common_devices();
  44
  45         /* Some mpc5200 & mpc5200b related configuration */
  46         mpc5200_setup_xlb_arbiter();
  47
  48         mpc52xx_setup_pci();
  49 }
  50
  51 /* list of the supported boards */
  52 static char *board[] __initdata = {
  53         "intercontrol,digsy-mtc",
  54         "promess,motionpro",
  55         "phytec,pcm030",
  56         "schindler,cm5200",
  57         "tqc,tqm5200",
  58         NULL
  59 };
  60
  61 /*
  62  * Called very early, MMU is off, device-tree isn't unflattened
  63  */
  64 static int __init mpc5200_simple_probe(void)
  65 {
  66         unsigned long node = of_get_flat_dt_root();
  67         int i = 0;
  68
  69         while (board[i]) {
  70                 if (of_flat_dt_is_compatible(node, board[i]))
  71                         break;
  72                 i++;
  73         }
  74
  75         return (board[i] != NULL);
  76 }
  77
  78 define_machine(mpc5200_simple_platform) {
  79         .name           = "mpc5200-simple-platform",
  80         .probe          = mpc5200_simple_probe,
  81         .setup_arch     = mpc5200_simple_setup_arch,
  82         .init           = mpc52xx_declare_of_platform_devices,
  83         .init_IRQ       = mpc52xx_init_irq,
  84         .get_irq        = mpc52xx_get_irq,
  85         .restart        = mpc52xx_restart,
  86         .calibrate_decr = generic_calibrate_decr,
  87 };