124 lines
3.2 KiB
C
124 lines
3.2 KiB
C
/*
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* Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
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*
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* Based on reduced version of METAG
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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/reboot.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/prom.h>
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#include <asm/clk.h>
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#include <asm/mach_desc.h>
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/* called from unflatten_device_tree() to bootstrap devicetree itself */
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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 __va(memblock_alloc(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 = NULL, *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, *compat;
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void *clk;
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char manufacturer[16];
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unsigned long len;
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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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initial_boot_params = devtree;
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dt_root = of_get_flat_dt_root();
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/*
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* The kernel could be multi-platform enabled, thus could have many
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* "baked-in" machine descriptors. Search thru all for the best
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* "compatible" string match.
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*/
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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("\n unrecognized device tree 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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machine_halt();
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}
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/* compat = "<manufacturer>,<model>" */
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compat = mdesc_best->dt_compat[0];
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model = strchr(compat, ',');
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if (model)
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model++;
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strlcpy(manufacturer, compat, model ? model - compat : strlen(compat));
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pr_info("Board \"%s\" from %s (Manufacturer)\n", model, manufacturer);
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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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/* Initialize {size,address}-cells info */
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of_scan_flat_dt(early_init_dt_scan_root, NULL);
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/* Setup memory, calling early_init_dt_add_memory_arch */
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of_scan_flat_dt(early_init_dt_scan_memory, NULL);
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clk = of_get_flat_dt_prop(dt_root, "clock-frequency", &len);
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if (clk)
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arc_set_core_freq(of_read_ulong(clk, len/4));
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return mdesc_best;
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}
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/*
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* Copy the flattened DT out of .init since unflattening doesn't copy strings
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* and the normal DT APIs refs them from orig flat DT
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*/
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void __init copy_devtree(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), 64);
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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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