arch/mips/kernel/prom.c

   1 /*
   2  * MIPS support for CONFIG_OF device tree support
   3  *
   4  * Copyright (C) 2010 Cisco Systems Inc. <dediao@cisco.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/init.h>
  12 #include <linux/export.h>
  13 #include <linux/errno.h>
  14 #include <linux/types.h>
  15 #include <linux/bootmem.h>
  16 #include <linux/initrd.h>
  17 #include <linux/debugfs.h>
  18 #include <linux/of.h>
  19 #include <linux/of_fdt.h>
  20 #include <linux/of_irq.h>
  21 #include <linux/of_platform.h>
  22
  23 #include <asm/page.h>
  24 #include <asm/prom.h>
  25
  26 static char mips_machine_name[64] = "Unknown";
  27
  28 __init void mips_set_machine_name(const char *name)
  29 {
  30         if (name == NULL)
  31                 return;
  32
  33         strncpy(mips_machine_name, name, sizeof(mips_machine_name));
  34         pr_info("MIPS: machine is %s\n", mips_get_machine_name());
  35 }
  36
  37 char *mips_get_machine_name(void)
  38 {
  39         return mips_machine_name;
  40 }
  41
  42 #ifdef CONFIG_OF
  43 int __init early_init_dt_scan_memory_arch(unsigned long node,
  44                                           const char *uname, int depth,
  45                                           void *data)
  46 {
  47         return early_init_dt_scan_memory(node, uname, depth, data);
  48 }
  49
  50 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
  51 {
  52         return add_memory_region(base, size, BOOT_MEM_RAM);
  53 }
  54
  55 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
  56 {
  57         return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
  58 }
  59
  60 #ifdef CONFIG_BLK_DEV_INITRD
  61 void __init early_init_dt_setup_initrd_arch(unsigned long start,
  62                                             unsigned long end)
  63 {
  64         initrd_start = (unsigned long)__va(start);
  65         initrd_end = (unsigned long)__va(end);
  66         initrd_below_start_ok = 1;
  67 }
  68 #endif
  69
  70 int __init early_init_dt_scan_model(unsigned long node, const char *uname,
  71                                     int depth, void *data)
  72 {
  73         if (!depth) {
  74                 char *model = of_get_flat_dt_prop(node, "model", NULL);
  75
  76                 if (model)
  77                         mips_set_machine_name(model);
  78         }
  79         return 0;
  80 }
  81
  82 void __init early_init_devtree(void *params)
  83 {
  84         /* Setup flat device-tree pointer */
  85         initial_boot_params = params;
  86
  87         /* Retrieve various informations from the /chosen node of the
  88          * device-tree, including the platform type, initrd location and
  89          * size, and more ...
  90          */
  91         of_scan_flat_dt(early_init_dt_scan_chosen, arcs_cmdline);
  92
  93
  94         /* Scan memory nodes */
  95         of_scan_flat_dt(early_init_dt_scan_root, NULL);
  96         of_scan_flat_dt(early_init_dt_scan_memory_arch, NULL);
  97
  98         /* try to load the mips machine name */
  99         of_scan_flat_dt(early_init_dt_scan_model, NULL);
 100 }
 101
 102 void __init __dt_setup_arch(struct boot_param_header *bph)
 103 {
 104         if (be32_to_cpu(bph->magic) != OF_DT_HEADER) {
 105                 pr_err("DTB has bad magic, ignoring builtin OF DTB\n");
 106
 107                 return;
 108         }
 109
 110         initial_boot_params = bph;
 111
 112         early_init_devtree(initial_boot_params);
 113 }
 114 #endif