mirror of https://gitee.com/openkylin/linux.git
114 lines
2.6 KiB
C
114 lines
2.6 KiB
C
/*
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* MIPS support for CONFIG_OF device tree support
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*
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* Copyright (C) 2010 Cisco Systems Inc. <dediao@cisco.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/errno.h>
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#include <linux/types.h>
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#include <linux/bootmem.h>
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#include <linux/initrd.h>
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#include <linux/debugfs.h>
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#include <linux/of.h>
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#include <linux/of_fdt.h>
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#include <linux/of_irq.h>
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#include <linux/of_platform.h>
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#include <asm/page.h>
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#include <asm/prom.h>
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static char mips_machine_name[64] = "Unknown";
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__init void mips_set_machine_name(const char *name)
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{
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if (name == NULL)
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return;
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strlcpy(mips_machine_name, name, sizeof(mips_machine_name));
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pr_info("MIPS: machine is %s\n", mips_get_machine_name());
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}
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char *mips_get_machine_name(void)
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{
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return mips_machine_name;
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}
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#ifdef CONFIG_OF
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int __init early_init_dt_scan_memory_arch(unsigned long node,
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const char *uname, int depth,
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void *data)
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{
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return early_init_dt_scan_memory(node, uname, depth, data);
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}
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void __init early_init_dt_add_memory_arch(u64 base, u64 size)
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{
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return add_memory_region(base, size, BOOT_MEM_RAM);
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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(size, align, __pa(MAX_DMA_ADDRESS));
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
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{
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initrd_start = (unsigned long)__va(start);
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initrd_end = (unsigned long)__va(end);
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initrd_below_start_ok = 1;
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}
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#endif
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int __init early_init_dt_scan_model(unsigned long node, const char *uname,
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int depth, void *data)
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{
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if (!depth) {
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char *model = of_get_flat_dt_prop(node, "model", NULL);
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if (model)
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mips_set_machine_name(model);
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}
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return 0;
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}
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void __init early_init_devtree(void *params)
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{
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/* Setup flat device-tree pointer */
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initial_boot_params = params;
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/* Retrieve various informations from the /chosen node of the
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* device-tree, including the platform type, initrd location and
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* size, and more ...
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*/
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of_scan_flat_dt(early_init_dt_scan_chosen, arcs_cmdline);
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/* Scan memory nodes */
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of_scan_flat_dt(early_init_dt_scan_root, NULL);
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of_scan_flat_dt(early_init_dt_scan_memory_arch, NULL);
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/* try to load the mips machine name */
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of_scan_flat_dt(early_init_dt_scan_model, NULL);
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}
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void __init __dt_setup_arch(struct boot_param_header *bph)
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{
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if (be32_to_cpu(bph->magic) != OF_DT_HEADER) {
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pr_err("DTB has bad magic, ignoring builtin OF DTB\n");
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return;
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}
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initial_boot_params = bph;
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early_init_devtree(initial_boot_params);
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}
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#endif
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