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
  25 #include "common.h"
  26
  27 __iomem void *rt_sysc_membase;
  28 __iomem void *rt_memc_membase;
  29
  30 extern struct boot_param_header __dtb_start;
  31
  32 __iomem void *plat_of_remap_node(const char *node)
  33 {
  34         struct resource res;
  35         struct device_node *np;
  36
  37         np = of_find_compatible_node(NULL, NULL, node);
  38         if (!np)
  39                 panic("Failed to find %s node", node);
  40
  41         if (of_address_to_resource(np, 0, &res))
  42                 panic("Failed to get resource for %s", node);
  43
  44         if ((request_mem_region(res.start,
  45                                 resource_size(&res),
  46                                 res.name) < 0))
  47                 panic("Failed to request resources for %s", node);
  48
  49         return ioremap_nocache(res.start, resource_size(&res));
  50 }
  51
  52 void __init device_tree_init(void)
  53 {
  54         unsigned long base, size;
  55         void *fdt_copy;
  56
  57         if (!initial_boot_params)
  58                 return;
  59
  60         base = virt_to_phys((void *)initial_boot_params);
  61         size = be32_to_cpu(initial_boot_params->totalsize);
  62
  63         /* Before we do anything, lets reserve the dt blob */
  64         reserve_bootmem(base, size, BOOTMEM_DEFAULT);
  65
  66         /* The strings in the flattened tree are referenced directly by the
  67          * device tree, so copy the flattened device tree from init memory
  68          * to regular memory.
  69          */
  70         fdt_copy = alloc_bootmem(size);
  71         memcpy(fdt_copy, initial_boot_params, size);
  72         initial_boot_params = fdt_copy;
  73
  74         unflatten_device_tree();
  75
  76         /* free the space reserved for the dt blob */
  77         free_bootmem(base, size);
  78 }
  79
  80 void __init plat_mem_setup(void)
  81 {
  82         set_io_port_base(KSEG1);
  83
  84         /*
  85          * Load the builtin devicetree. This causes the chosen node to be
  86          * parsed resulting in our memory appearing
  87          */
  88         __dt_setup_arch(&__dtb_start);
  89
  90         if (soc_info.mem_size)
  91                 add_memory_region(soc_info.mem_base, soc_info.mem_size * SZ_1M,
  92                                   BOOT_MEM_RAM);
  93         else
  94                 detect_memory_region(soc_info.mem_base,
  95                                      soc_info.mem_size_min * SZ_1M,
  96                                      soc_info.mem_size_max * SZ_1M);
  97 }
  98
  99 static int __init plat_of_setup(void)
 100 {
 101         static struct of_device_id of_ids[3];
 102         int len = sizeof(of_ids[0].compatible);
 103
 104         if (!of_have_populated_dt())
 105                 panic("device tree not present");
 106
 107         strncpy(of_ids[0].compatible, soc_info.compatible, len);
 108         strncpy(of_ids[1].compatible, "palmbus", len);
 109
 110         if (of_platform_populate(NULL, of_ids, NULL, NULL))
 111                 panic("failed to populate DT\n");
 112
 113         return 0;
 114 }
 115
 116 arch_initcall(plat_of_setup);