forked from Minki/linux
f2ffa5ab74
Add the ability to enable CONFIG_OF on the MIPS architecture. Signed-off-by: Dezhong Diao <dediao@cisco.com> [grant.likely@secretlab.ca: cleared out obsolete hooks, removed ARCH_HAS_DEVTREE_MEM, remove __init tags from header file, removed debugfs support hunk] [ddaney@linux-mips.org: backed out over aggressive trimming of hooks] Acked-by: Ralf Baechle <ralf@linux-mips.org> Tested-by: David Daney <ddaney@caviumnetworks.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
113 lines
2.8 KiB
C
113 lines
2.8 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/module.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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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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int __init reserve_mem_mach(unsigned long addr, unsigned long size)
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{
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return reserve_bootmem(addr, size, BOOTMEM_DEFAULT);
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}
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void __init free_mem_mach(unsigned long addr, unsigned long size)
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{
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return free_bootmem(addr, size);
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}
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u64 __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
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{
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return virt_to_phys(
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__alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS))
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);
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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(unsigned long start,
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unsigned long 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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/*
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* irq_create_of_mapping - Hook to resolve OF irq specifier into a Linux irq#
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*
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* Currently the mapping mechanism is trivial; simple flat hwirq numbers are
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* mapped 1:1 onto Linux irq numbers. Cascaded irq controllers are not
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* supported.
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*/
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unsigned int irq_create_of_mapping(struct device_node *controller,
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const u32 *intspec, unsigned int intsize)
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{
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return intspec[0];
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}
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EXPORT_SYMBOL_GPL(irq_create_of_mapping);
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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, NULL);
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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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}
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void __init device_tree_init(void)
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{
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unsigned long base, size;
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if (!initial_boot_params)
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return;
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base = virt_to_phys((void *)initial_boot_params);
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size = initial_boot_params->totalsize;
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/* Before we do anything, lets reserve the dt blob */
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reserve_mem_mach(base, size);
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unflatten_device_tree();
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/* free the space reserved for the dt blob */
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free_mem_mach(base, size);
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}
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