/Ethereal-msm8939-beta9/arch/metag/kernel/devtree.c
https://bitbucket.org/MilosStamenkovic95/etherealos · C · 114 lines · 71 code · 15 blank · 28 comment · 10 complexity · d9006c482e17c1e125ed13cca469b783 MD5 · raw file
- /*
- * linux/arch/metag/kernel/devtree.c
- *
- * Copyright (C) 2012 Imagination Technologies Ltd.
- *
- * Based on ARM version:
- * Copyright (C) 2009 Canonical Ltd. <jeremy.kerr@canonical.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
- #include <linux/init.h>
- #include <linux/export.h>
- #include <linux/types.h>
- #include <linux/bootmem.h>
- #include <linux/memblock.h>
- #include <linux/of.h>
- #include <linux/of_fdt.h>
- #include <asm/setup.h>
- #include <asm/page.h>
- #include <asm/mach/arch.h>
- void __init early_init_dt_add_memory_arch(u64 base, u64 size)
- {
- pr_err("%s(%llx, %llx)\n",
- __func__, base, size);
- }
- void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
- {
- return alloc_bootmem_align(size, align);
- }
- /**
- * setup_machine_fdt - Machine setup when an dtb was passed to the kernel
- * @dt: virtual address pointer to dt blob
- *
- * If a dtb was passed to the kernel, then use it to choose the correct
- * machine_desc and to setup the system.
- */
- struct machine_desc * __init setup_machine_fdt(void *dt)
- {
- struct boot_param_header *devtree = dt;
- struct machine_desc *mdesc, *mdesc_best = NULL;
- unsigned int score, mdesc_score = ~1;
- unsigned long dt_root;
- const char *model;
- /* check device tree validity */
- if (be32_to_cpu(devtree->magic) != OF_DT_HEADER)
- return NULL;
- /* Search the mdescs for the 'best' compatible value match */
- initial_boot_params = devtree;
- dt_root = of_get_flat_dt_root();
- for_each_machine_desc(mdesc) {
- score = of_flat_dt_match(dt_root, mdesc->dt_compat);
- if (score > 0 && score < mdesc_score) {
- mdesc_best = mdesc;
- mdesc_score = score;
- }
- }
- if (!mdesc_best) {
- const char *prop;
- long size;
- pr_err("\nError: unrecognized/unsupported device tree compatible list:\n[ ");
- prop = of_get_flat_dt_prop(dt_root, "compatible", &size);
- if (prop) {
- while (size > 0) {
- printk("'%s' ", prop);
- size -= strlen(prop) + 1;
- prop += strlen(prop) + 1;
- }
- }
- printk("]\n\n");
- dump_machine_table(); /* does not return */
- }
- model = of_get_flat_dt_prop(dt_root, "model", NULL);
- if (!model)
- model = of_get_flat_dt_prop(dt_root, "compatible", NULL);
- if (!model)
- model = "<unknown>";
- pr_info("Machine: %s, model: %s\n", mdesc_best->name, model);
- /* Retrieve various information from the /chosen node */
- of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
- return mdesc_best;
- }
- /**
- * copy_fdt - Copy device tree into non-init memory.
- *
- * We must copy the flattened device tree blob into non-init memory because the
- * unflattened device tree will reference the strings in it directly.
- */
- void __init copy_fdt(void)
- {
- void *alloc = early_init_dt_alloc_memory_arch(
- be32_to_cpu(initial_boot_params->totalsize), 0x40);
- if (alloc) {
- memcpy(alloc, initial_boot_params,
- be32_to_cpu(initial_boot_params->totalsize));
- initial_boot_params = alloc;
- }
- }