Commit 29dd78cf authored by James Hogan's avatar James Hogan
Browse files

metag: Device tree



Add device tree files to arch/metag.
Signed-off-by: default avatarJames Hogan <james.hogan@imgtec.com>
Reviewed-by: default avatarVineet Gupta <vgupta@synopsys.com>
parent 262d96b0
dtb-y += skeleton.dtb
# Built-in dtb
builtindtb-y := skeleton
ifneq ($(CONFIG_METAG_BUILTIN_DTB_NAME),"")
builtindtb-y := $(CONFIG_METAG_BUILTIN_DTB_NAME)
endif
obj-$(CONFIG_METAG_BUILTIN_DTB) += $(patsubst "%",%,$(builtindtb-y)).dtb.o
targets += dtbs
targets += $(dtb-y)
dtbs: $(addprefix $(obj)/, $(dtb-y))
clean-files += *.dtb
/*
* Copyright (C) 2012 Imagination Technologies Ltd.
*
* 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.
*/
/dts-v1/;
/include/ "skeleton.dtsi"
/*
* Skeleton device tree; the bare minimum needed to boot; just include and
* add a compatible value. The bootloader will typically populate the memory
* node.
*/
/ {
compatible = "img,meta";
#address-cells = <1>;
#size-cells = <1>;
chosen { };
aliases { };
memory { device_type = "memory"; reg = <0 0>; };
};
/*
* arch/metag/include/asm/prom.h
*
* 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.
*
*/
#ifndef __ASM_METAG_PROM_H
#define __ASM_METAG_PROM_H
#include <asm/setup.h>
#define HAVE_ARCH_DEVTREE_FIXUPS
extern struct machine_desc *setup_machine_fdt(void *dt);
extern void metag_dt_memblock_reserve(void);
#endif /* __ASM_METAG_PROM_H */
/*
* 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;
}
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