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 45 void __init early_init_dt_scan_chosen_arch(unsigned long node) 46 { 47 /* No Microblaze specific code here */ 48 } 49 50 void __init early_init_dt_add_memory_arch(u64 base, u64 size) 51 { 52 memblock_add(base, size); 53 } 54 55 u64 __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 */ 62 static 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 */ 88 int __init early_uartlite_console(void) 89 { 90 return of_scan_flat_dt(early_init_dt_scan_serial, NULL); 91 } 92 #endif 93 94 void __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 124 void __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) 145 static struct debugfs_blob_wrapper flat_dt_blob; 146 147 static 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 } 161 device_initcall(export_flat_device_tree); 162 #endif 163