1/* 2 * Procedures for creating, accessing and interpreting the device tree. 3 * 4 * Paul Mackerras August 1996. 5 * Copyright (C) 1996-2005 Paul Mackerras. 6 * 7 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner. 8 * {engebret|bergner}@us.ibm.com 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 */ 15 16#include <stdarg.h> 17#include <linux/kernel.h> 18#include <linux/string.h> 19#include <linux/init.h> 20#include <linux/threads.h> 21#include <linux/spinlock.h> 22#include <linux/types.h> 23#include <linux/pci.h> 24#include <linux/stringify.h> 25#include <linux/delay.h> 26#include <linux/initrd.h> 27#include <linux/bitops.h> 28#include <linux/module.h> 29#include <linux/kexec.h> 30#include <linux/debugfs.h> 31#include <linux/irq.h> 32#include <linux/memblock.h> 33 34#include <asm/prom.h> 35#include <asm/page.h> 36#include <asm/processor.h> 37#include <asm/irq.h> 38#include <linux/io.h> 39#include <asm/system.h> 40#include <asm/mmu.h> 41#include <asm/pgtable.h> 42#include <asm/sections.h> 43#include <asm/pci-bridge.h> 44 45void __init early_init_dt_scan_chosen_arch(unsigned long node) 46{ 47 /* No Microblaze specific code here */ 48} 49 50void __init early_init_dt_add_memory_arch(u64 base, u64 size) 51{ 52 memblock_add(base, size); 53} 54 55u64 __init early_init_dt_alloc_memory_arch(u64 size, u64 align) 56{ 57 return memblock_alloc(size, align); 58} 59 60#ifdef CONFIG_EARLY_PRINTK 61/* MS this is Microblaze specifig function */ 62static int __init early_init_dt_scan_serial(unsigned long node, 63 const char *uname, int depth, void *data) 64{ 65 unsigned long l; 66 char *p; 67 int *addr; 68 69 pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); 70 71/* find all serial nodes */ 72 if (strncmp(uname, "serial", 6) != 0) 73 return 0; 74 75 early_init_dt_check_for_initrd(node); 76 77/* find compatible node with uartlite */ 78 p = of_get_flat_dt_prop(node, "compatible", &l); 79 if ((strncmp(p, "xlnx,xps-uartlite", 17) != 0) && 80 (strncmp(p, "xlnx,opb-uartlite", 17) != 0)) 81 return 0; 82 83 addr = of_get_flat_dt_prop(node, "reg", &l); 84 return *addr; /* return address */ 85} 86 87/* this function is looking for early uartlite console - Microblaze specific */ 88int __init early_uartlite_console(void) 89{ 90 return of_scan_flat_dt(early_init_dt_scan_serial, NULL); 91} 92#endif 93 94void __init early_init_devtree(void *params) 95{ 96 pr_debug(" -> early_init_devtree(%p)\n", params); 97 98 /* Setup flat device-tree pointer */ 99 initial_boot_params = params; 100 101 /* Retrieve various informations from the /chosen node of the 102 * device-tree, including the platform type, initrd location and 103 * size, TCE reserve, and more ... 104 */ 105 of_scan_flat_dt(early_init_dt_scan_chosen, NULL); 106 107 /* Scan memory nodes and rebuild MEMBLOCKs */ 108 memblock_init(); 109 of_scan_flat_dt(early_init_dt_scan_root, NULL); 110 of_scan_flat_dt(early_init_dt_scan_memory, NULL); 111 112 /* Save command line for /proc/cmdline and then parse parameters */ 113 strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE); 114 parse_early_param(); 115 116 memblock_analyze(); 117 118 pr_debug("Phys. mem: %lx\n", (unsigned long) memblock_phys_mem_size()); 119 120 pr_debug(" <- early_init_devtree()\n"); 121} 122 123#ifdef CONFIG_BLK_DEV_INITRD 124void __init early_init_dt_setup_initrd_arch(unsigned long start, 125 unsigned long end) 126{ 127 initrd_start = (unsigned long)__va(start); 128 initrd_end = (unsigned long)__va(end); 129 initrd_below_start_ok = 1; 130} 131#endif 132 133/******* 134 * 135 * New implementation of the OF "find" APIs, return a refcounted 136 * object, call of_node_put() when done. The device tree and list 137 * are protected by a rw_lock. 138 * 139 * Note that property management will need some locking as well, 140 * this isn't dealt with yet. 141 * 142 *******/ 143 144#if defined(CONFIG_DEBUG_FS) && defined(DEBUG) 145static struct debugfs_blob_wrapper flat_dt_blob; 146 147static int __init export_flat_device_tree(void) 148{ 149 struct dentry *d; 150 151 flat_dt_blob.data = initial_boot_params; 152 flat_dt_blob.size = initial_boot_params->totalsize; 153 154 d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR, 155 of_debugfs_root, &flat_dt_blob); 156 if (!d) 157 return 1; 158 159 return 0; 160} 161device_initcall(export_flat_device_tree); 162#endif 163