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_add_memory_arch(u64 base, u64 size) 46 { 47 memblock_add(base, size); 48 } 49 50 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align) 51 { 52 return __va(memblock_alloc(size, align)); 53 } 54 55 #ifdef CONFIG_EARLY_PRINTK 56 /* MS this is Microblaze specifig function */ 57 static int __init early_init_dt_scan_serial(unsigned long node, 58 const char *uname, int depth, void *data) 59 { 60 unsigned long l; 61 char *p; 62 const __be32 *addr; 63 64 pr_debug("search \"serial\", depth: %d, uname: %s\n", depth, uname); 65 66 /* find all serial nodes */ 67 if (strncmp(uname, "serial", 6) != 0) 68 return 0; 69 70 /* find compatible node with uartlite */ 71 p = of_get_flat_dt_prop(node, "compatible", &l); 72 if ((strncmp(p, "xlnx,xps-uartlite", 17) != 0) && 73 (strncmp(p, "xlnx,opb-uartlite", 17) != 0) && 74 (strncmp(p, "xlnx,axi-uartlite", 17) != 0)) 75 return 0; 76 77 addr = of_get_flat_dt_prop(node, "reg", &l); 78 return be32_to_cpup(addr); /* return address */ 79 } 80 81 /* this function is looking for early uartlite console - Microblaze specific */ 82 int __init early_uartlite_console(void) 83 { 84 return of_scan_flat_dt(early_init_dt_scan_serial, NULL); 85 } 86 87 /* MS this is Microblaze specifig function */ 88 static int __init early_init_dt_scan_serial_full(unsigned long node, 89 const char *uname, int depth, void *data) 90 { 91 unsigned long l; 92 char *p; 93 unsigned int addr; 94 95 pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); 96 97 /* find all serial nodes */ 98 if (strncmp(uname, "serial", 6) != 0) 99 return 0; 100 101 early_init_dt_check_for_initrd(node); 102 103 /* find compatible node with uartlite */ 104 p = of_get_flat_dt_prop(node, "compatible", &l); 105 106 if ((strncmp(p, "xlnx,xps-uart16550", 18) != 0) && 107 (strncmp(p, "xlnx,axi-uart16550", 18) != 0)) 108 return 0; 109 110 addr = *(u32 *)of_get_flat_dt_prop(node, "reg", &l); 111 addr += *(u32 *)of_get_flat_dt_prop(node, "reg-offset", &l); 112 return be32_to_cpu(addr); /* return address */ 113 } 114 115 /* this function is looking for early uartlite console - Microblaze specific */ 116 int __init early_uart16550_console(void) 117 { 118 return of_scan_flat_dt(early_init_dt_scan_serial_full, NULL); 119 } 120 #endif 121 122 void __init early_init_devtree(void *params) 123 { 124 pr_debug(" -> early_init_devtree(%p)\n", params); 125 126 /* Setup flat device-tree pointer */ 127 initial_boot_params = params; 128 129 /* Retrieve various informations from the /chosen node of the 130 * device-tree, including the platform type, initrd location and 131 * size, TCE reserve, and more ... 132 */ 133 of_scan_flat_dt(early_init_dt_scan_chosen, cmd_line); 134 135 /* Scan memory nodes and rebuild MEMBLOCKs */ 136 memblock_init(); 137 of_scan_flat_dt(early_init_dt_scan_root, NULL); 138 of_scan_flat_dt(early_init_dt_scan_memory, NULL); 139 140 /* Save command line for /proc/cmdline and then parse parameters */ 141 strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE); 142 parse_early_param(); 143 144 memblock_analyze(); 145 146 pr_debug("Phys. mem: %lx\n", (unsigned long) memblock_phys_mem_size()); 147 148 pr_debug(" <- early_init_devtree()\n"); 149 } 150 151 #ifdef CONFIG_BLK_DEV_INITRD 152 void __init early_init_dt_setup_initrd_arch(unsigned long start, 153 unsigned long end) 154 { 155 initrd_start = (unsigned long)__va(start); 156 initrd_end = (unsigned long)__va(end); 157 initrd_below_start_ok = 1; 158 } 159 #endif 160 161 /******* 162 * 163 * New implementation of the OF "find" APIs, return a refcounted 164 * object, call of_node_put() when done. The device tree and list 165 * are protected by a rw_lock. 166 * 167 * Note that property management will need some locking as well, 168 * this isn't dealt with yet. 169 * 170 *******/ 171 172 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG) 173 static struct debugfs_blob_wrapper flat_dt_blob; 174 175 static int __init export_flat_device_tree(void) 176 { 177 struct dentry *d; 178 179 flat_dt_blob.data = initial_boot_params; 180 flat_dt_blob.size = initial_boot_params->totalsize; 181 182 d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR, 183 of_debugfs_root, &flat_dt_blob); 184 if (!d) 185 return 1; 186 187 return 0; 188 } 189 device_initcall(export_flat_device_tree); 190 #endif 191