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/export.h>
  12 #include <linux/init.h>
  13 #include <linux/sizes.h>
  14 #include <linux/of_fdt.h>
  15 #include <linux/kernel.h>
  16 #include <linux/memblock.h>
  17 #include <linux/of_platform.h>
  18 #include <linux/of_address.h>
  19
  20 #include <asm/reboot.h>
  21 #include <asm/bootinfo.h>
  22 #include <asm/addrspace.h>
  23 #include <asm/prom.h>
  24 #include <asm/mach-ralink/ralink_regs.h>
  25
  26 #include "common.h"
  27
  28 __iomem void *rt_sysc_membase;
  29 __iomem void *rt_memc_membase;
  30 EXPORT_SYMBOL_GPL(rt_sysc_membase);
  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         of_node_put(np);
  45
  46         if (!request_mem_region(res.start,
  47                                 resource_size(&res),
  48                                 res.name))
  49                 panic("Failed to request resources for %s", node);
  50
  51         return ioremap(res.start, resource_size(&res));
  52 }
  53
  54 void __init plat_mem_setup(void)
  55 {
  56         void *dtb;
  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         dtb = get_fdt();
  65         __dt_setup_arch(dtb);
  66
  67         if (early_init_dt_scan_memory())
  68                 return;
  69
  70         if (soc_info.mem_detect)
  71                 soc_info.mem_detect();
  72         else if (soc_info.mem_size)
  73                 memblock_add(soc_info.mem_base, soc_info.mem_size * SZ_1M);
  74         else
  75                 detect_memory_region(soc_info.mem_base,
  76                                      soc_info.mem_size_min * SZ_1M,
  77                                      soc_info.mem_size_max * SZ_1M);
  78 }
  79
  80 static int __init plat_of_setup(void)
  81 {
  82         __dt_register_buses(soc_info.compatible, "palmbus");
  83
  84         /* make sure that the reset controller is setup early */
  85         if (ralink_soc != MT762X_SOC_MT7621AT)
  86                 ralink_rst_init();
  87
  88         return 0;
  89 }
  90
  91 arch_initcall(plat_of_setup);