mips/ralink/of.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  *
0004  * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
0005  * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
0006  * Copyright (C) 2013 John Crispin <john@phrozen.org>
0007  */
0008
0009 #include <linux/io.h>
0010 #include <linux/clk.h>
0011 #include <linux/export.h>
0012 #include <linux/init.h>
0013 #include <linux/sizes.h>
0014 #include <linux/of_fdt.h>
0015 #include <linux/kernel.h>
0016 #include <linux/memblock.h>
0017 #include <linux/of_platform.h>
0018 #include <linux/of_address.h>
0019
0020 #include <asm/reboot.h>
0021 #include <asm/bootinfo.h>
0022 #include <asm/addrspace.h>
0023 #include <asm/prom.h>
0024
0025 #include "common.h"
0026
0027 __iomem void *rt_sysc_membase;
0028 __iomem void *rt_memc_membase;
0029 EXPORT_SYMBOL_GPL(rt_sysc_membase);
0030
0031 __iomem void *plat_of_remap_node(const char *node)
0032 {
0033     struct resource res;
0034     struct device_node *np;
0035
0036     np = of_find_compatible_node(NULL, NULL, node);
0037     if (!np)
0038         panic("Failed to find %s node", node);
0039
0040     if (of_address_to_resource(np, 0, &res))
0041         panic("Failed to get resource for %s", node);
0042
0043     of_node_put(np);
0044
0045     if (!request_mem_region(res.start,
0046                 resource_size(&res),
0047                 res.name))
0048         panic("Failed to request resources for %s", node);
0049
0050     return ioremap(res.start, resource_size(&res));
0051 }
0052
0053 void __init plat_mem_setup(void)
0054 {
0055     void *dtb;
0056
0057     set_io_port_base(KSEG1);
0058
0059     /*
0060      * Load the builtin devicetree. This causes the chosen node to be
0061      * parsed resulting in our memory appearing.
0062      */
0063     dtb = get_fdt();
0064     __dt_setup_arch(dtb);
0065
0066     if (!early_init_dt_scan_memory())
0067         return;
0068
0069     if (soc_info.mem_detect)
0070         soc_info.mem_detect();
0071     else if (soc_info.mem_size)
0072         memblock_add(soc_info.mem_base, soc_info.mem_size * SZ_1M);
0073     else
0074         detect_memory_region(soc_info.mem_base,
0075                      soc_info.mem_size_min * SZ_1M,
0076                      soc_info.mem_size_max * SZ_1M);
0077 }
0078
0079 static int __init plat_of_setup(void)
0080 {
0081     __dt_register_buses(soc_info.compatible, "palmbus");
0082
0083     /* make sure that the reset controller is setup early */
0084     ralink_rst_init();
0085
0086     return 0;
0087 }
0088
0089 arch_initcall(plat_of_setup);