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 #include <asm/prom.h>
  43
  44 extern u32 __dtb_xlp_evp_begin[], __dtb_xlp_svp_begin[],
  45         __dtb_xlp_fvp_begin[], __dtb_start[];
  46 static void *xlp_fdt_blob;
  47
  48 void __init *xlp_dt_init(void *fdtp)
  49 {
  50         if (!fdtp) {
  51                 switch (current_cpu_data.processor_id & 0xff00) {
  52 #ifdef CONFIG_DT_XLP_FVP
  53                 case PRID_IMP_NETLOGIC_XLP2XX:
  54                         fdtp = __dtb_xlp_fvp_begin;
  55                         break;
  56 #endif
  57 #ifdef CONFIG_DT_XLP_SVP
  58                 case PRID_IMP_NETLOGIC_XLP3XX:
  59                         fdtp = __dtb_xlp_svp_begin;
  60                         break;
  61 #endif
  62 #ifdef CONFIG_DT_XLP_EVP
  63                 case PRID_IMP_NETLOGIC_XLP8XX:
  64                         fdtp = __dtb_xlp_evp_begin;
  65                         break;
  66 #endif
  67                 default:
  68                         /* Pick a built-in if any, and hope for the best */
  69                         fdtp = __dtb_start;
  70                         break;
  71                 }
  72         }
  73         xlp_fdt_blob = fdtp;
  74         return fdtp;
  75 }
  76
  77 void __init xlp_early_init_devtree(void)
  78 {
  79         __dt_setup_arch(xlp_fdt_blob);
  80         strlcpy(arcs_cmdline, boot_command_line, COMMAND_LINE_SIZE);
  81 }
  82
  83 void __init device_tree_init(void)
  84 {
  85         unsigned long base, size;
  86         struct boot_param_header *fdtp = xlp_fdt_blob;
  87
  88         if (!fdtp)
  89                 return;
  90
  91         base = virt_to_phys(fdtp);
  92         size = be32_to_cpu(fdtp->totalsize);
  93
  94         /* Before we do anything, lets reserve the dt blob */
  95         reserve_bootmem(base, size, BOOTMEM_DEFAULT);
  96
  97         unflatten_device_tree();
  98
  99         /* free the space reserved for the dt blob */
 100         free_bootmem(base, size);
 101 }
 102
 103 static struct of_device_id __initdata xlp_ids[] = {
 104         { .compatible = "simple-bus", },
 105         {},
 106 };
 107
 108 int __init xlp8xx_ds_publish_devices(void)
 109 {
 110         if (!of_have_populated_dt())
 111                 return 0;
 112         return of_platform_bus_probe(NULL, xlp_ids, NULL);
 113 }
 114
 115 device_initcall(xlp8xx_ds_publish_devices);