LXR linux/arch/mips/ralink/of.c

   1/*
   2 * This program is free software; you can redistribute it and/or modify it
   3 * under the terms of the GNU General Public License version 2 as published
   4 * by the Free Software Foundation.
   5 *
   6 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   7 * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
   8 * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
   9 */
  10
  11#include <linux/io.h>
  12#include <linux/clk.h>
  13#include <linux/init.h>
  14#include <linux/sizes.h>
  15#include <linux/of_fdt.h>
  16#include <linux/kernel.h>
  17#include <linux/bootmem.h>
  18#include <linux/of_platform.h>
  19#include <linux/of_address.h>
  20
  21#include <asm/reboot.h>
  22#include <asm/bootinfo.h>
  23#include <asm/addrspace.h>
  24#include <asm/prom.h>
  25
  26#include "common.h"
  27
  28__iomem void *rt_sysc_membase;
  29__iomem void *rt_memc_membase;
  30
  31__iomem void *plat_of_remap_node(const char *node)
  32{
  33        struct resource res;
  34        struct device_node *np;
  35
  36        np = of_find_compatible_node(NULL, NULL, node);
  37        if (!np)
  38                panic("Failed to find %s node", node);
  39
  40        if (of_address_to_resource(np, 0, &res))
  41                panic("Failed to get resource for %s", node);
  42
  43        if ((request_mem_region(res.start,
  44                                resource_size(&res),
  45                                res.name) < 0))
  46                panic("Failed to request resources for %s", node);
  47
  48        return ioremap_nocache(res.start, resource_size(&res));
  49}
  50
  51void __init device_tree_init(void)
  52{
  53        unflatten_and_copy_device_tree();
  54}
  55
  56static int memory_dtb;
  57
  58static int __init early_init_dt_find_memory(unsigned long node,
  59                                const char *uname, int depth, void *data)
  60{
  61        if (depth == 1 && !strcmp(uname, "memory@0"))
  62                memory_dtb = 1;
  63
  64        return 0;
  65}
  66
  67void __init plat_mem_setup(void)
  68{
  69        set_io_port_base(KSEG1);
  70
  71        /*
  72         * Load the builtin devicetree. This causes the chosen node to be
  73         * parsed resulting in our memory appearing
  74         */
  75        __dt_setup_arch(__dtb_start);
  76
  77        of_scan_flat_dt(early_init_dt_find_memory, NULL);
  78        if (memory_dtb)
  79                of_scan_flat_dt(early_init_dt_scan_memory, NULL);
  80        else if (soc_info.mem_size)
  81                add_memory_region(soc_info.mem_base, soc_info.mem_size * SZ_1M,
  82                                  BOOT_MEM_RAM);
  83        else
  84                detect_memory_region(soc_info.mem_base,
  85                                     soc_info.mem_size_min * SZ_1M,
  86                                     soc_info.mem_size_max * SZ_1M);
  87}
  88
  89static int __init plat_of_setup(void)
  90{
  91        __dt_register_buses(soc_info.compatible, "palmbus");
  92
  93        /* make sure that the reset controller is setup early */
  94        ralink_rst_init();
  95
  96        return 0;
  97}
  98
  99arch_initcall(plat_of_setup);
 100