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/lmb.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 /* export that to outside world */ 46 struct device_node *of_chosen; 47 48 void __init early_init_dt_scan_chosen_arch(unsigned long node) 49 { 50 /* No Microblaze specific code here */ 51 } 52 53 void __init early_init_dt_add_memory_arch(u64 base, u64 size) 54 { 55 lmb_add(base, size); 56 } 57 58 u64 __init early_init_dt_alloc_memory_arch(u64 size, u64 align) 59 { 60 return lmb_alloc(size, align); 61 } 62 63 #ifdef CONFIG_EARLY_PRINTK 64 /* MS this is Microblaze specifig function */ 65 static int __init early_init_dt_scan_serial(unsigned long node, 66 const char *uname, int depth, void *data) 67 { 68 unsigned long l; 69 char *p; 70 int *addr; 71 72 pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); 73 74 /* find all serial nodes */ 75 if (strncmp(uname, "serial", 6) != 0) 76 return 0; 77 78 early_init_dt_check_for_initrd(node); 79 80 /* find compatible node with uartlite */ 81 p = of_get_flat_dt_prop(node, "compatible", &l); 82 if ((strncmp(p, "xlnx,xps-uartlite", 17) != 0) && 83 (strncmp(p, "xlnx,opb-uartlite", 17) != 0)) 84 return 0; 85 86 addr = of_get_flat_dt_prop(node, "reg", &l); 87 return *addr; /* return address */ 88 } 89 90 /* this function is looking for early uartlite console - Microblaze specific */ 91 int __init early_uartlite_console(void) 92 { 93 return of_scan_flat_dt(early_init_dt_scan_serial, NULL); 94 } 95 #endif 96 97 void __init early_init_devtree(void *params) 98 { 99 pr_debug(" -> early_init_devtree(%p)\n", params); 100 101 /* Setup flat device-tree pointer */ 102 initial_boot_params = params; 103 104 /* Retrieve various informations from the /chosen node of the 105 * device-tree, including the platform type, initrd location and 106 * size, TCE reserve, and more ... 107 */ 108 of_scan_flat_dt(early_init_dt_scan_chosen, NULL); 109 110 /* Scan memory nodes and rebuild LMBs */ 111 lmb_init(); 112 of_scan_flat_dt(early_init_dt_scan_root, NULL); 113 of_scan_flat_dt(early_init_dt_scan_memory, NULL); 114 115 /* Save command line for /proc/cmdline and then parse parameters */ 116 strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE); 117 parse_early_param(); 118 119 lmb_analyze(); 120 121 pr_debug("Phys. mem: %lx\n", (unsigned long) lmb_phys_mem_size()); 122 123 pr_debug(" <- early_init_devtree()\n"); 124 } 125 126 #ifdef CONFIG_BLK_DEV_INITRD 127 void __init early_init_dt_setup_initrd_arch(unsigned long start, 128 unsigned long end) 129 { 130 initrd_start = (unsigned long)__va(start); 131 initrd_end = (unsigned long)__va(end); 132 initrd_below_start_ok = 1; 133 } 134 #endif 135 136 /******* 137 * 138 * New implementation of the OF "find" APIs, return a refcounted 139 * object, call of_node_put() when done. The device tree and list 140 * are protected by a rw_lock. 141 * 142 * Note that property management will need some locking as well, 143 * this isn't dealt with yet. 144 * 145 *******/ 146 147 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG) 148 static struct debugfs_blob_wrapper flat_dt_blob; 149 150 static int __init export_flat_device_tree(void) 151 { 152 struct dentry *d; 153 154 flat_dt_blob.data = initial_boot_params; 155 flat_dt_blob.size = initial_boot_params->totalsize; 156 157 d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR, 158 of_debugfs_root, &flat_dt_blob); 159 if (!d) 160 return 1; 161 162 return 0; 163 } 164 device_initcall(export_flat_device_tree); 165 #endif 166