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 extern struct boot_param_header __dtb_start;
  32
  33 __iomem void *plat_of_remap_node(const char *node)
  34 {
  35         struct resource res;
  36         struct device_node *np;
  37
  38         np = of_find_compatible_node(NULL, NULL, node);
  39         if (!np)
  40                 panic("Failed to find %s node", node);
  41
  42         if (of_address_to_resource(np, 0, &res))
  43                 panic("Failed to get resource for %s", node);
  44
  45         if ((request_mem_region(res.start,
  46                                 resource_size(&res),
  47                                 res.name) < 0))
  48                 panic("Failed to request resources for %s", node);
  49
  50         return ioremap_nocache(res.start, resource_size(&res));
  51 }
  52
  53 void __init device_tree_init(void)
  54 {
  55         unsigned long base, size;
  56         void *fdt_copy;
  57
  58         if (!initial_boot_params)
  59                 return;
  60
  61         base = virt_to_phys((void *)initial_boot_params);
  62         size = be32_to_cpu(initial_boot_params->totalsize);
  63
  64         /* Before we do anything, lets reserve the dt blob */
  65         reserve_bootmem(base, size, BOOTMEM_DEFAULT);
  66
  67         /* The strings in the flattened tree are referenced directly by the
  68          * device tree, so copy the flattened device tree from init memory
  69          * to regular memory.
  70          */
  71         fdt_copy = alloc_bootmem(size);
  72         memcpy(fdt_copy, initial_boot_params, size);
  73         initial_boot_params = fdt_copy;
  74
  75         unflatten_device_tree();
  76
  77         /* free the space reserved for the dt blob */
  78         free_bootmem(base, size);
  79 }
  80
  81 void __init plat_mem_setup(void)
  82 {
  83         set_io_port_base(KSEG1);
  84
  85         /*
  86          * Load the builtin devicetree. This causes the chosen node to be
  87          * parsed resulting in our memory appearing
  88          */
  89         __dt_setup_arch(&__dtb_start);
  90
  91         if (soc_info.mem_size)
  92                 add_memory_region(soc_info.mem_base, soc_info.mem_size * SZ_1M,
  93                                   BOOT_MEM_RAM);
  94         else
  95                 detect_memory_region(soc_info.mem_base,
  96                                      soc_info.mem_size_min * SZ_1M,
  97                                      soc_info.mem_size_max * SZ_1M);
  98 }
  99
 100 static int __init plat_of_setup(void)
 101 {
 102         static struct of_device_id of_ids[3];
 103         int len = sizeof(of_ids[0].compatible);
 104
 105         if (!of_have_populated_dt())
 106                 panic("device tree not present");
 107
 108         strlcpy(of_ids[0].compatible, soc_info.compatible, len);
 109         strncpy(of_ids[1].compatible, "palmbus", len);
 110
 111         if (of_platform_populate(NULL, of_ids, NULL, NULL))
 112                 panic("failed to populate DT");
 113
 114         /* make sure ithat the reset controller is setup early */
 115         ralink_rst_init();
 116
 117         return 0;
 118 }
 119
 120 arch_initcall(plat_of_setup);