arch/mips/ralink/of.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *
   4  * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   5  * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
   6  * Copyright (C) 2013 John Crispin <john@phrozen.org>
   7  */
   8
   9 #include <linux/io.h>
  10 #include <linux/clk.h>
  11 #include <linux/init.h>
  12 #include <linux/sizes.h>
  13 #include <linux/of_fdt.h>
  14 #include <linux/kernel.h>
  15 #include <linux/memblock.h>
  16 #include <linux/of_platform.h>
  17 #include <linux/of_address.h>
  18
  19 #include <asm/reboot.h>
  20 #include <asm/bootinfo.h>
  21 #include <asm/addrspace.h>
  22 #include <asm/prom.h>
  23
  24 #include "common.h"
  25
  26 __iomem void *rt_sysc_membase;
  27 __iomem void *rt_memc_membase;
  28
  29 __iomem void *plat_of_remap_node(const char *node)
  30 {
  31         struct resource res;
  32         struct device_node *np;
  33
  34         np = of_find_compatible_node(NULL, NULL, node);
  35         if (!np)
  36                 panic("Failed to find %s node", node);
  37
  38         if (of_address_to_resource(np, 0, &res))
  39                 panic("Failed to get resource for %s", node);
  40
  41         if (!request_mem_region(res.start,
  42                                 resource_size(&res),
  43                                 res.name))
  44                 panic("Failed to request resources for %s", node);
  45
  46         return ioremap(res.start, resource_size(&res));
  47 }
  48
  49 void __init device_tree_init(void)
  50 {
  51         unflatten_and_copy_device_tree();
  52 }
  53
  54 static int memory_dtb;
  55
  56 static int __init early_init_dt_find_memory(unsigned long node,
  57                                 const char *uname, int depth, void *data)
  58 {
  59         if (depth == 1 && !strcmp(uname, "memory@0"))
  60                 memory_dtb = 1;
  61
  62         return 0;
  63 }
  64
  65 void __init plat_mem_setup(void)
  66 {
  67         void *dtb = NULL;
  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. fw_passed_dtb is used
  74          * by CONFIG_MIPS_APPENDED_RAW_DTB as well.
  75          */
  76         if (fw_passed_dtb)
  77                 dtb = (void *)fw_passed_dtb;
  78         else if (__dtb_start != __dtb_end)
  79                 dtb = (void *)__dtb_start;
  80
  81         __dt_setup_arch(dtb);
  82
  83         of_scan_flat_dt(early_init_dt_find_memory, NULL);
  84         if (memory_dtb)
  85                 of_scan_flat_dt(early_init_dt_scan_memory, NULL);
  86         else if (soc_info.mem_size)
  87                 memblock_add(soc_info.mem_base, soc_info.mem_size * SZ_1M);
  88         else
  89                 detect_memory_region(soc_info.mem_base,
  90                                      soc_info.mem_size_min * SZ_1M,
  91                                      soc_info.mem_size_max * SZ_1M);
  92 }
  93
  94 static int __init plat_of_setup(void)
  95 {
  96         __dt_register_buses(soc_info.compatible, "palmbus");
  97
  98         /* make sure that the reset controller is setup early */
  99         ralink_rst_init();
 100
 101         return 0;
 102 }
 103
 104 arch_initcall(plat_of_setup);