115 lines
3.0 KiB
C
115 lines
3.0 KiB
C
/*
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* linux/arch/metag/kernel/devtree.c
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*
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* Copyright (C) 2012 Imagination Technologies Ltd.
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*
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* Based on ARM version:
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* Copyright (C) 2009 Canonical Ltd. <jeremy.kerr@canonical.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/export.h>
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#include <linux/types.h>
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#include <linux/bootmem.h>
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#include <linux/memblock.h>
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#include <linux/of.h>
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#include <linux/of_fdt.h>
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#include <asm/setup.h>
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#include <asm/page.h>
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#include <asm/mach/arch.h>
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void __init early_init_dt_add_memory_arch(u64 base, u64 size)
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{
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pr_err("%s(%llx, %llx)\n",
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__func__, base, size);
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}
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void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
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{
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return alloc_bootmem_align(size, align);
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}
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/**
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* setup_machine_fdt - Machine setup when an dtb was passed to the kernel
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* @dt: virtual address pointer to dt blob
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*
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* If a dtb was passed to the kernel, then use it to choose the correct
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* machine_desc and to setup the system.
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*/
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struct machine_desc * __init setup_machine_fdt(void *dt)
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{
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struct boot_param_header *devtree = dt;
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struct machine_desc *mdesc, *mdesc_best = NULL;
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unsigned int score, mdesc_score = ~1;
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unsigned long dt_root;
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const char *model;
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/* check device tree validity */
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if (be32_to_cpu(devtree->magic) != OF_DT_HEADER)
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return NULL;
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/* Search the mdescs for the 'best' compatible value match */
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initial_boot_params = devtree;
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dt_root = of_get_flat_dt_root();
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for_each_machine_desc(mdesc) {
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score = of_flat_dt_match(dt_root, mdesc->dt_compat);
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if (score > 0 && score < mdesc_score) {
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mdesc_best = mdesc;
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mdesc_score = score;
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}
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}
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if (!mdesc_best) {
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const char *prop;
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long size;
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pr_err("\nError: unrecognized/unsupported device tree compatible list:\n[ ");
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prop = of_get_flat_dt_prop(dt_root, "compatible", &size);
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if (prop) {
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while (size > 0) {
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printk("'%s' ", prop);
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size -= strlen(prop) + 1;
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prop += strlen(prop) + 1;
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}
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}
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printk("]\n\n");
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dump_machine_table(); /* does not return */
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}
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model = of_get_flat_dt_prop(dt_root, "model", NULL);
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if (!model)
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model = of_get_flat_dt_prop(dt_root, "compatible", NULL);
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if (!model)
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model = "<unknown>";
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pr_info("Machine: %s, model: %s\n", mdesc_best->name, model);
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/* Retrieve various information from the /chosen node */
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of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
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return mdesc_best;
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}
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/**
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* copy_fdt - Copy device tree into non-init memory.
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*
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* We must copy the flattened device tree blob into non-init memory because the
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* unflattened device tree will reference the strings in it directly.
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*/
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void __init copy_fdt(void)
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{
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void *alloc = early_init_dt_alloc_memory_arch(
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be32_to_cpu(initial_boot_params->totalsize), 0x40);
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if (alloc) {
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memcpy(alloc, initial_boot_params,
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be32_to_cpu(initial_boot_params->totalsize));
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initial_boot_params = alloc;
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}
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}
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