1 /* 2 * OpenRISC prom.c 3 * 4 * Linux architectural port borrowing liberally from similar works of 5 * others. All original copyrights apply as per the original source 6 * declaration. 7 * 8 * Modifications for the OpenRISC architecture: 9 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> 10 * 11 * This program is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License 13 * as published by the Free Software Foundation; either version 14 * 2 of the License, or (at your option) any later version. 15 * 16 * Architecture specific procedures for creating, accessing and 17 * interpreting the device tree. 18 * 19 */ 20 21 #include <stdarg.h> 22 #include <linux/kernel.h> 23 #include <linux/string.h> 24 #include <linux/init.h> 25 #include <linux/threads.h> 26 #include <linux/spinlock.h> 27 #include <linux/types.h> 28 #include <linux/pci.h> 29 #include <linux/stringify.h> 30 #include <linux/delay.h> 31 #include <linux/initrd.h> 32 #include <linux/bitops.h> 33 #include <linux/module.h> 34 #include <linux/kexec.h> 35 #include <linux/debugfs.h> 36 #include <linux/irq.h> 37 #include <linux/memblock.h> 38 #include <linux/of_fdt.h> 39 40 #include <asm/prom.h> 41 #include <asm/page.h> 42 #include <asm/processor.h> 43 #include <asm/irq.h> 44 #include <linux/io.h> 45 #include <asm/mmu.h> 46 #include <asm/pgtable.h> 47 #include <asm/sections.h> 48 #include <asm/setup.h> 49 50 extern char cmd_line[COMMAND_LINE_SIZE]; 51 52 void __init early_init_dt_add_memory_arch(u64 base, u64 size) 53 { 54 size &= PAGE_MASK; 55 memblock_add(base, size); 56 } 57 58 void __init early_init_devtree(void *params) 59 { 60 void *alloc; 61 62 /* Setup flat device-tree pointer */ 63 initial_boot_params = params; 64 65 66 /* Retrieve various informations from the /chosen node of the 67 * device-tree, including the platform type, initrd location and 68 * size, TCE reserve, and more ... 69 */ 70 of_scan_flat_dt(early_init_dt_scan_chosen, cmd_line); 71 72 /* Scan memory nodes and rebuild MEMBLOCKs */ 73 of_scan_flat_dt(early_init_dt_scan_root, NULL); 74 of_scan_flat_dt(early_init_dt_scan_memory, NULL); 75 76 /* Save command line for /proc/cmdline and then parse parameters */ 77 strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE); 78 79 memblock_allow_resize(); 80 81 /* We must copy the flattend device tree from init memory to regular 82 * memory because the device tree references the strings in it 83 * directly. 84 */ 85 86 alloc = __va(memblock_alloc(initial_boot_params->totalsize, PAGE_SIZE)); 87 88 memcpy(alloc, initial_boot_params, initial_boot_params->totalsize); 89 90 initial_boot_params = alloc; 91 } 92 93 #ifdef CONFIG_BLK_DEV_INITRD 94 void __init early_init_dt_setup_initrd_arch(u64 start, u64 end) 95 { 96 initrd_start = (unsigned long)__va(start); 97 initrd_end = (unsigned long)__va(end); 98 initrd_below_start_ok = 1; 99 } 100 #endif 101