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/init.h> 12 #include <linux/sizes.h> 13 #include <linux/of_fdt.h> 14 #include <linux/kernel.h> 15 #include <linux/memblock.h> 16 #include <linux/of_platform.h> 17 #include <linux/of_address.h> 18 19 #include <asm/reboot.h> 20 #include <asm/bootinfo.h> 21 #include <asm/addrspace.h> 22 #include <asm/prom.h> 23 24 #include "common.h" 25 26 __iomem void *rt_sysc_membase; 27 __iomem void *rt_memc_membase; 28 29 __iomem void *plat_of_remap_node(const char *node) 30 { 31 struct resource res; 32 struct device_node *np; 33 34 np = of_find_compatible_node(NULL, NULL, node); 35 if (!np) 36 panic("Failed to find %s node", node); 37 38 if (of_address_to_resource(np, 0, &res)) 39 panic("Failed to get resource for %s", node); 40 41 if (!request_mem_region(res.start, 42 resource_size(&res), 43 res.name)) 44 panic("Failed to request resources for %s", node); 45 46 return ioremap(res.start, resource_size(&res)); 47 } 48 49 void __init device_tree_init(void) 50 { 51 unflatten_and_copy_device_tree(); 52 } 53 54 static int memory_dtb; 55 56 static int __init early_init_dt_find_memory(unsigned long node, 57 const char *uname, int depth, void *data) 58 { 59 if (depth == 1 && !strcmp(uname, "memory@0")) 60 memory_dtb = 1; 61 62 return 0; 63 } 64 65 void __init plat_mem_setup(void) 66 { 67 void *dtb; 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 dtb = get_fdt(); 76 __dt_setup_arch(dtb); 77 78 of_scan_flat_dt(early_init_dt_find_memory, NULL); 79 if (memory_dtb) 80 of_scan_flat_dt(early_init_dt_scan_memory, NULL); 81 else if (soc_info.mem_size) 82 memblock_add(soc_info.mem_base, soc_info.mem_size * SZ_1M); 83 else 84 detect_memory_region(soc_info.mem_base, 85 soc_info.mem_size_min * SZ_1M, 86 soc_info.mem_size_max * SZ_1M); 87 } 88 89 static int __init plat_of_setup(void) 90 { 91 __dt_register_buses(soc_info.compatible, "palmbus"); 92 93 /* make sure that the reset controller is setup early */ 94 ralink_rst_init(); 95 96 return 0; 97 } 98 99 arch_initcall(plat_of_setup); 100