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
  51 void __init device_tree_init(void)
  52 {
  53         unflatten_and_copy_device_tree();
  54 }
  55
  56 void __init plat_mem_setup(void)
  57 {
  58         set_io_port_base(KSEG1);
  59
  60         /*
  61          * Load the builtin devicetree. This causes the chosen node to be
  62          * parsed resulting in our memory appearing
  63          */
  64         __dt_setup_arch(__dtb_start);
  65
  66         if (soc_info.mem_size)
  67                 add_memory_region(soc_info.mem_base, soc_info.mem_size * SZ_1M,
  68                                   BOOT_MEM_RAM);
  69         else
  70                 detect_memory_region(soc_info.mem_base,
  71                                      soc_info.mem_size_min * SZ_1M,
  72                                      soc_info.mem_size_max * SZ_1M);
  73 }
  74
  75 static int __init plat_of_setup(void)
  76 {
  77         static struct of_device_id of_ids[3];
  78         int len = sizeof(of_ids[0].compatible);
  79
  80         if (!of_have_populated_dt())
  81                 panic("device tree not present");
  82
  83         strlcpy(of_ids[0].compatible, soc_info.compatible, len);
  84         strlcpy(of_ids[1].compatible, "palmbus", len);
  85
  86         if (of_platform_populate(NULL, of_ids, NULL, NULL))
  87                 panic("failed to populate DT");
  88
  89         /* make sure ithat the reset controller is setup early */
  90         ralink_rst_init();
  91
  92         return 0;
  93 }
  94
  95 arch_initcall(plat_of_setup);