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. 5 * 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 */ 10 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> 20 21 #include <asm/reboot.h> 22 #include <asm/bootinfo.h> 23 #include <asm/addrspace.h> 24 #include <asm/prom.h> 25 26 #include "common.h" 27 28 __iomem void *rt_sysc_membase; 29 __iomem void *rt_memc_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) < 0)) 46 panic("Failed to request resources for %s", node); 47 48 return ioremap_nocache(res.start, resource_size(&res)); 49 } 50 51 void __init device_tree_init(void) 52 { 53 unflatten_and_copy_device_tree(); 54 } 55 56 static int memory_dtb; 57 58 static int __init early_init_dt_find_memory(unsigned long node, 59 const char *uname, int depth, void *data) 60 { 61 if (depth == 1 && !strcmp(uname, "memory@0")) 62 memory_dtb = 1; 63 64 return 0; 65 } 66 67 void __init plat_mem_setup(void) 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 74 */ 75 __dt_setup_arch(__dtb_start); 76 77 strlcpy(arcs_cmdline, boot_command_line, COMMAND_LINE_SIZE); 78 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); 89 } 90 91 static int __init plat_of_setup(void) 92 { 93 __dt_register_buses(soc_info.compatible, "palmbus"); 94 95 /* make sure that the reset controller is setup early */ 96 ralink_rst_init(); 97 98 return 0; 99 } 100 101 arch_initcall(plat_of_setup); 102