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 <john@phrozen.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))
  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 static int memory_dtb;
  57
  58 static 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
  67 void __init plat_mem_setup(void)
  68 {
  69         void *dtb = NULL;
  70
  71         set_io_port_base(KSEG1);
  72
  73         /*
  74          * Load the builtin devicetree. This causes the chosen node to be
  75          * parsed resulting in our memory appearing. fw_passed_dtb is used
  76          * by CONFIG_MIPS_APPENDED_RAW_DTB as well.
  77          */
  78         if (fw_passed_dtb)
  79                 dtb = (void *)fw_passed_dtb;
  80         else if (__dtb_start != __dtb_end)
  81                 dtb = (void *)__dtb_start;
  82
  83         __dt_setup_arch(dtb);
  84
  85         of_scan_flat_dt(early_init_dt_find_memory, NULL);
  86         if (memory_dtb)
  87                 of_scan_flat_dt(early_init_dt_scan_memory, NULL);
  88         else if (soc_info.mem_size)
  89                 add_memory_region(soc_info.mem_base, soc_info.mem_size * SZ_1M,
  90                                   BOOT_MEM_RAM);
  91         else
  92                 detect_memory_region(soc_info.mem_base,
  93                                      soc_info.mem_size_min * SZ_1M,
  94                                      soc_info.mem_size_max * SZ_1M);
  95 }
  96
  97 static int __init plat_of_setup(void)
  98 {
  99         __dt_register_buses(soc_info.compatible, "palmbus");
 100
 101         /* make sure that the reset controller is setup early */
 102         ralink_rst_init();
 103
 104         return 0;
 105 }
 106
 107 arch_initcall(plat_of_setup);