2 * Procedures for creating, accessing and interpreting the device tree.
4 * Paul Mackerras August 1996.
5 * Copyright (C) 1996-2005 Paul Mackerras.
7 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
8 * {engebret|bergner}@us.ibm.com
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.
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>
36 #include <asm/processor.h>
39 #include <asm/system.h>
41 #include <asm/pgtable.h>
42 #include <asm/sections.h>
43 #include <asm/pci-bridge.h>
45 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
47 memblock_add(base, size);
50 u64 __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
52 return memblock_alloc(size, align);
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)
64 pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
66 /* find all serial nodes */
67 if (strncmp(uname, "serial", 6) != 0)
70 early_init_dt_check_for_initrd(node);
72 /* find compatible node with uartlite */
73 p = of_get_flat_dt_prop(node, "compatible", &l);
74 if ((strncmp(p, "xlnx,xps-uartlite", 17) != 0) &&
75 (strncmp(p, "xlnx,opb-uartlite", 17) != 0) &&
76 (strncmp(p, "xlnx,axi-uartlite", 17) != 0))
79 addr = of_get_flat_dt_prop(node, "reg", &l);
80 return be32_to_cpup(addr); /* return address */
83 /* this function is looking for early uartlite console - Microblaze specific */
84 int __init early_uartlite_console(void)
86 return of_scan_flat_dt(early_init_dt_scan_serial, NULL);
89 /* MS this is Microblaze specifig function */
90 static int __init early_init_dt_scan_serial_full(unsigned long node,
91 const char *uname, int depth, void *data)
97 pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
99 /* find all serial nodes */
100 if (strncmp(uname, "serial", 6) != 0)
103 early_init_dt_check_for_initrd(node);
105 /* find compatible node with uartlite */
106 p = of_get_flat_dt_prop(node, "compatible", &l);
108 if ((strncmp(p, "xlnx,xps-uart16550", 18) != 0) &&
109 (strncmp(p, "xlnx,axi-uart16550", 18) != 0))
112 addr = *(u32 *)of_get_flat_dt_prop(node, "reg", &l);
113 addr += *(u32 *)of_get_flat_dt_prop(node, "reg-offset", &l);
114 return be32_to_cpu(addr); /* return address */
117 /* this function is looking for early uartlite console - Microblaze specific */
118 int __init early_uart16550_console(void)
120 return of_scan_flat_dt(early_init_dt_scan_serial_full, NULL);
124 void __init early_init_devtree(void *params)
126 pr_debug(" -> early_init_devtree(%p)\n", params);
128 /* Setup flat device-tree pointer */
129 initial_boot_params = params;
131 /* Retrieve various informations from the /chosen node of the
132 * device-tree, including the platform type, initrd location and
133 * size, TCE reserve, and more ...
135 of_scan_flat_dt(early_init_dt_scan_chosen, NULL);
137 /* Scan memory nodes and rebuild MEMBLOCKs */
139 of_scan_flat_dt(early_init_dt_scan_root, NULL);
140 of_scan_flat_dt(early_init_dt_scan_memory, NULL);
142 /* Save command line for /proc/cmdline and then parse parameters */
143 strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
148 pr_debug("Phys. mem: %lx\n", (unsigned long) memblock_phys_mem_size());
150 pr_debug(" <- early_init_devtree()\n");
153 #ifdef CONFIG_BLK_DEV_INITRD
154 void __init early_init_dt_setup_initrd_arch(unsigned long start,
157 initrd_start = (unsigned long)__va(start);
158 initrd_end = (unsigned long)__va(end);
159 initrd_below_start_ok = 1;
165 * New implementation of the OF "find" APIs, return a refcounted
166 * object, call of_node_put() when done. The device tree and list
167 * are protected by a rw_lock.
169 * Note that property management will need some locking as well,
170 * this isn't dealt with yet.
174 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
175 static struct debugfs_blob_wrapper flat_dt_blob;
177 static int __init export_flat_device_tree(void)
181 flat_dt_blob.data = initial_boot_params;
182 flat_dt_blob.size = initial_boot_params->totalsize;
184 d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
185 of_debugfs_root, &flat_dt_blob);
191 device_initcall(export_flat_device_tree);