linux/arch/metag/kernel/devtree.c
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   1/*
   2 *  linux/arch/metag/kernel/devtree.c
   3 *
   4 *  Copyright (C) 2012 Imagination Technologies Ltd.
   5 *
   6 *  Based on ARM version:
   7 *  Copyright (C) 2009 Canonical Ltd. <jeremy.kerr@canonical.com>
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License version 2 as
  11 * published by the Free Software Foundation.
  12 */
  13
  14#include <linux/init.h>
  15#include <linux/export.h>
  16#include <linux/types.h>
  17#include <linux/bootmem.h>
  18#include <linux/memblock.h>
  19#include <linux/of.h>
  20#include <linux/of_fdt.h>
  21
  22#include <asm/setup.h>
  23#include <asm/page.h>
  24#include <asm/mach/arch.h>
  25
  26void __init early_init_dt_add_memory_arch(u64 base, u64 size)
  27{
  28        pr_err("%s(%llx, %llx)\n",
  29               __func__, base, size);
  30}
  31
  32void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
  33{
  34        return alloc_bootmem_align(size, align);
  35}
  36
  37/**
  38 * setup_machine_fdt - Machine setup when an dtb was passed to the kernel
  39 * @dt:         virtual address pointer to dt blob
  40 *
  41 * If a dtb was passed to the kernel, then use it to choose the correct
  42 * machine_desc and to setup the system.
  43 */
  44struct machine_desc * __init setup_machine_fdt(void *dt)
  45{
  46        struct boot_param_header *devtree = dt;
  47        struct machine_desc *mdesc, *mdesc_best = NULL;
  48        unsigned int score, mdesc_score = ~1;
  49        unsigned long dt_root;
  50        const char *model;
  51
  52        /* check device tree validity */
  53        if (be32_to_cpu(devtree->magic) != OF_DT_HEADER)
  54                return NULL;
  55
  56        /* Search the mdescs for the 'best' compatible value match */
  57        initial_boot_params = devtree;
  58        dt_root = of_get_flat_dt_root();
  59
  60        for_each_machine_desc(mdesc) {
  61                score = of_flat_dt_match(dt_root, mdesc->dt_compat);
  62                if (score > 0 && score < mdesc_score) {
  63                        mdesc_best = mdesc;
  64                        mdesc_score = score;
  65                }
  66        }
  67        if (!mdesc_best) {
  68                const char *prop;
  69                long size;
  70
  71                pr_err("\nError: unrecognized/unsupported device tree compatible list:\n[ ");
  72
  73                prop = of_get_flat_dt_prop(dt_root, "compatible", &size);
  74                if (prop) {
  75                        while (size > 0) {
  76                                printk("'%s' ", prop);
  77                                size -= strlen(prop) + 1;
  78                                prop += strlen(prop) + 1;
  79                        }
  80                }
  81                printk("]\n\n");
  82
  83                dump_machine_table(); /* does not return */
  84        }
  85
  86        model = of_get_flat_dt_prop(dt_root, "model", NULL);
  87        if (!model)
  88                model = of_get_flat_dt_prop(dt_root, "compatible", NULL);
  89        if (!model)
  90                model = "<unknown>";
  91        pr_info("Machine: %s, model: %s\n", mdesc_best->name, model);
  92
  93        /* Retrieve various information from the /chosen node */
  94        of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
  95
  96        return mdesc_best;
  97}
  98
  99/**
 100 * copy_fdt - Copy device tree into non-init memory.
 101 *
 102 * We must copy the flattened device tree blob into non-init memory because the
 103 * unflattened device tree will reference the strings in it directly.
 104 */
 105void __init copy_fdt(void)
 106{
 107        void *alloc = early_init_dt_alloc_memory_arch(
 108                        be32_to_cpu(initial_boot_params->totalsize), 0x40);
 109        if (alloc) {
 110                memcpy(alloc, initial_boot_params,
 111                       be32_to_cpu(initial_boot_params->totalsize));
 112                initial_boot_params = alloc;
 113        }
 114}
 115