arch/mips/netlogic/xlp/dt.c

   1 /*
   2  * Copyright 2003-2013 Broadcom Corporation.
   3  * All Rights Reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the Broadcom
   9  * license below:
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  *
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in
  19  *    the documentation and/or other materials provided with the
  20  *    distribution.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR
  23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  24  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  29  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  30  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
  31  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  32  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <linux/kernel.h>
  36 #include <linux/bootmem.h>
  37
  38 #include <linux/of_fdt.h>
  39 #include <linux/of_platform.h>
  40 #include <linux/of_device.h>
  41
  42 extern u32 __dtb_xlp_evp_begin[], __dtb_xlp_svp_begin[],
  43         __dtb_xlp_fvp_begin[], __dtb_start[];
  44
  45 void __init *xlp_dt_init(void *fdtp)
  46 {
  47         if (!fdtp) {
  48                 switch (current_cpu_data.processor_id & 0xff00) {
  49 #ifdef CONFIG_DT_XLP_FVP
  50                 case PRID_IMP_NETLOGIC_XLP2XX:
  51                         fdtp = __dtb_xlp_fvp_begin;
  52                         break;
  53 #endif
  54 #ifdef CONFIG_DT_XLP_SVP
  55                 case PRID_IMP_NETLOGIC_XLP3XX:
  56                         fdtp = __dtb_xlp_svp_begin;
  57                         break;
  58 #endif
  59 #ifdef CONFIG_DT_XLP_EVP
  60                 case PRID_IMP_NETLOGIC_XLP8XX:
  61                         fdtp = __dtb_xlp_evp_begin;
  62                         break;
  63 #endif
  64                 default:
  65                         /* Pick a built-in if any, and hope for the best */
  66                         fdtp = __dtb_start;
  67                         break;
  68                 }
  69         }
  70         initial_boot_params = fdtp;
  71         return fdtp;
  72 }
  73
  74 void __init device_tree_init(void)
  75 {
  76         unsigned long base, size;
  77
  78         if (!initial_boot_params)
  79                 return;
  80
  81         base = virt_to_phys((void *)initial_boot_params);
  82         size = be32_to_cpu(initial_boot_params->totalsize);
  83
  84         /* Before we do anything, lets reserve the dt blob */
  85         reserve_bootmem(base, size, BOOTMEM_DEFAULT);
  86
  87         unflatten_device_tree();
  88
  89         /* free the space reserved for the dt blob */
  90         free_bootmem(base, size);
  91 }
  92
  93 static struct of_device_id __initdata xlp_ids[] = {
  94         { .compatible = "simple-bus", },
  95         {},
  96 };
  97
  98 int __init xlp8xx_ds_publish_devices(void)
  99 {
 100         if (!of_have_populated_dt())
 101                 return 0;
 102         return of_platform_bus_probe(NULL, xlp_ids, NULL);
 103 }
 104
 105 device_initcall(xlp8xx_ds_publish_devices);