![John Crispin](/assets/img/avatar_default.png)
Until there is a generic MIPS way of handing the DTB over from bootloader to kernel we rely on a built in devicetrees. The OF code also remaps those register ranges that we use global in our drivers. Signed-off-by: John Crispin <blogic@openwrt.org> Signed-off-by: Gabor Juhos <juhosg@openwrt.org> Patchwork: http://patchwork.linux-mips.org/patch/4895/
108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
|
|
* Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
|
|
* Copyright (C) 2013 John Crispin <blogic@openwrt.org>
|
|
*/
|
|
|
|
#include <linux/io.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/init.h>
|
|
#include <linux/of_fdt.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/of_address.h>
|
|
|
|
#include <asm/reboot.h>
|
|
#include <asm/bootinfo.h>
|
|
#include <asm/addrspace.h>
|
|
|
|
#include "common.h"
|
|
|
|
__iomem void *rt_sysc_membase;
|
|
__iomem void *rt_memc_membase;
|
|
|
|
extern struct boot_param_header __dtb_start;
|
|
|
|
__iomem void *plat_of_remap_node(const char *node)
|
|
{
|
|
struct resource res;
|
|
struct device_node *np;
|
|
|
|
np = of_find_compatible_node(NULL, NULL, node);
|
|
if (!np)
|
|
panic("Failed to find %s node", node);
|
|
|
|
if (of_address_to_resource(np, 0, &res))
|
|
panic("Failed to get resource for %s", node);
|
|
|
|
if ((request_mem_region(res.start,
|
|
resource_size(&res),
|
|
res.name) < 0))
|
|
panic("Failed to request resources for %s", node);
|
|
|
|
return ioremap_nocache(res.start, resource_size(&res));
|
|
}
|
|
|
|
void __init device_tree_init(void)
|
|
{
|
|
unsigned long base, size;
|
|
void *fdt_copy;
|
|
|
|
if (!initial_boot_params)
|
|
return;
|
|
|
|
base = virt_to_phys((void *)initial_boot_params);
|
|
size = be32_to_cpu(initial_boot_params->totalsize);
|
|
|
|
/* Before we do anything, lets reserve the dt blob */
|
|
reserve_bootmem(base, size, BOOTMEM_DEFAULT);
|
|
|
|
/* The strings in the flattened tree are referenced directly by the
|
|
* device tree, so copy the flattened device tree from init memory
|
|
* to regular memory.
|
|
*/
|
|
fdt_copy = alloc_bootmem(size);
|
|
memcpy(fdt_copy, initial_boot_params, size);
|
|
initial_boot_params = fdt_copy;
|
|
|
|
unflatten_device_tree();
|
|
|
|
/* free the space reserved for the dt blob */
|
|
free_bootmem(base, size);
|
|
}
|
|
|
|
void __init plat_mem_setup(void)
|
|
{
|
|
set_io_port_base(KSEG1);
|
|
|
|
/*
|
|
* Load the builtin devicetree. This causes the chosen node to be
|
|
* parsed resulting in our memory appearing
|
|
*/
|
|
__dt_setup_arch(&__dtb_start);
|
|
}
|
|
|
|
static int __init plat_of_setup(void)
|
|
{
|
|
static struct of_device_id of_ids[3];
|
|
int len = sizeof(of_ids[0].compatible);
|
|
|
|
if (!of_have_populated_dt())
|
|
panic("device tree not present");
|
|
|
|
strncpy(of_ids[0].compatible, soc_info.compatible, len);
|
|
strncpy(of_ids[1].compatible, "palmbus", len);
|
|
|
|
if (of_platform_populate(NULL, of_ids, NULL, NULL))
|
|
panic("failed to populate DT\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
arch_initcall(plat_of_setup);
|