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/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
  25 #include "common.h"
  26
  27 __iomem void *rt_sysc_membase;
  28 __iomem void *rt_memc_membase;
  29 EXPORT_SYMBOL_GPL(rt_sysc_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(res.start, resource_size(&res));
  49 }
  50
  51 void __init plat_mem_setup(void)
  52 {
  53         void *dtb;
  54
  55         set_io_port_base(KSEG1);
  56
  57         /*
  58          * Load the builtin devicetree. This causes the chosen node to be
  59          * parsed resulting in our memory appearing.
  60          */
  61         dtb = get_fdt();
  62         __dt_setup_arch(dtb);
  63
  64         if (!early_init_dt_scan_memory())
  65                 return;
  66
  67         if (soc_info.mem_detect)
  68                 soc_info.mem_detect();
  69         else if (soc_info.mem_size)
  70                 memblock_add(soc_info.mem_base, soc_info.mem_size * SZ_1M);
  71         else
  72                 detect_memory_region(soc_info.mem_base,
  73                                      soc_info.mem_size_min * SZ_1M,
  74                                      soc_info.mem_size_max * SZ_1M);
  75 }
  76
  77 static int __init plat_of_setup(void)
  78 {
  79         __dt_register_buses(soc_info.compatible, "palmbus");
  80
  81         /* make sure that the reset controller is setup early */
  82         ralink_rst_init();
  83
  84         return 0;
  85 }
  86
  87 arch_initcall(plat_of_setup);