Linux 4.1.18
[linux/fpc-iii.git] / arch / mips / ralink / of.c
blob0d30dcd6324623a3ed6dc635ec653a2619228132
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.
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 <blogic@openwrt.org>
9 */
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>
21 #include <asm/reboot.h>
22 #include <asm/bootinfo.h>
23 #include <asm/addrspace.h>
24 #include <asm/prom.h>
26 #include "common.h"
28 __iomem void *rt_sysc_membase;
29 __iomem void *rt_memc_membase;
31 __iomem void *plat_of_remap_node(const char *node)
33 struct resource res;
34 struct device_node *np;
36 np = of_find_compatible_node(NULL, NULL, node);
37 if (!np)
38 panic("Failed to find %s node", node);
40 if (of_address_to_resource(np, 0, &res))
41 panic("Failed to get resource for %s", node);
43 if ((request_mem_region(res.start,
44 resource_size(&res),
45 res.name) < 0))
46 panic("Failed to request resources for %s", node);
48 return ioremap_nocache(res.start, resource_size(&res));
51 void __init device_tree_init(void)
53 unflatten_and_copy_device_tree();
56 static int memory_dtb;
58 static int __init early_init_dt_find_memory(unsigned long node,
59 const char *uname, int depth, void *data)
61 if (depth == 1 && !strcmp(uname, "memory@0"))
62 memory_dtb = 1;
64 return 0;
67 void __init plat_mem_setup(void)
69 set_io_port_base(KSEG1);
72 * Load the builtin devicetree. This causes the chosen node to be
73 * parsed resulting in our memory appearing
75 __dt_setup_arch(__dtb_start);
77 strlcpy(arcs_cmdline, boot_command_line, COMMAND_LINE_SIZE);
79 of_scan_flat_dt(early_init_dt_find_memory, NULL);
80 if (memory_dtb)
81 of_scan_flat_dt(early_init_dt_scan_memory, NULL);
82 else if (soc_info.mem_size)
83 add_memory_region(soc_info.mem_base, soc_info.mem_size * SZ_1M,
84 BOOT_MEM_RAM);
85 else
86 detect_memory_region(soc_info.mem_base,
87 soc_info.mem_size_min * SZ_1M,
88 soc_info.mem_size_max * SZ_1M);
91 static int __init plat_of_setup(void)
93 __dt_register_buses(soc_info.compatible, "palmbus");
95 /* make sure that the reset controller is setup early */
96 ralink_rst_init();
98 return 0;
101 arch_initcall(plat_of_setup);