forked from luck/tmp_suning_uos_patched
08a543ad33
This patch adds irq_domain infrastructure for translating from hardware irq numbers to linux irqs. This is particularly important for architectures adding device tree support because the current implementation (excluding PowerPC and SPARC) cannot handle translation for more than a single interrupt controller. irq_domain supports device tree translation for any number of interrupt controllers. This patch converts x86, Microblaze, ARM and MIPS to use irq_domain for device tree irq translation. x86 is untested beyond compiling it, irq_domain is enabled for MIPS and Microblaze, but the old behaviour is preserved until the core code is modified to actually register an irq_domain yet. On ARM it works and is required for much of the new ARM device tree board support. PowerPC has /not/ been converted to use this new infrastructure. It is still missing some features before it can replace the virq infrastructure already in powerpc (see documentation on irq_domain_map/unmap for details). Followup patches will add the missing pieces and migrate PowerPC to use irq_domain. SPARC has its own method of managing interrupts from the device tree and is unaffected by this change. Acked-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
135 lines
3.5 KiB
C
135 lines
3.5 KiB
C
/*
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* linux/arch/arm/kernel/devtree.c
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*
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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/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/memblock.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/setup.h>
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#include <asm/page.h>
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#include <asm/mach/arch.h>
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#include <asm/mach-types.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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arm_add_memory(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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void __init arm_dt_memblock_reserve(void)
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{
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u64 *reserve_map, base, size;
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if (!initial_boot_params)
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return;
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/* Reserve the dtb region */
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memblock_reserve(virt_to_phys(initial_boot_params),
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be32_to_cpu(initial_boot_params->totalsize));
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/*
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* Process the reserve map. This will probably overlap the initrd
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* and dtb locations which are already reserved, but overlaping
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* doesn't hurt anything
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*/
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reserve_map = ((void*)initial_boot_params) +
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be32_to_cpu(initial_boot_params->off_mem_rsvmap);
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while (1) {
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base = be64_to_cpup(reserve_map++);
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size = be64_to_cpup(reserve_map++);
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if (!size)
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break;
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memblock_reserve(base, size);
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}
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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_phys: physical address of dt blob
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*
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* If a dtb was passed to the kernel in r2, then use it to choose the
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* correct machine_desc and to setup the system.
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*/
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struct machine_desc * __init setup_machine_fdt(unsigned int dt_phys)
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{
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struct boot_param_header *devtree;
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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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if (!dt_phys)
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return NULL;
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devtree = phys_to_virt(dt_phys);
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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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early_print("\nError: unrecognized/unsupported "
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"device tree compatible list:\n[ ");
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prop = of_get_flat_dt_prop(dt_root, "compatible", &size);
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while (size > 0) {
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early_print("'%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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early_print("]\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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/* 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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/* Change machine number to match the mdesc we're using */
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__machine_arch_type = mdesc_best->nr;
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return mdesc_best;
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}
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