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_scan_chosen_arch(unsigned long node)
47 /* No Microblaze specific code here */
50 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
52 memblock_add(base, size);
55 u64 __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
57 return memblock_alloc(size, align);
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)
69 pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
71 /* find all serial nodes */
72 if (strncmp(uname, "serial", 6) != 0)
75 early_init_dt_check_for_initrd(node);
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))
83 addr = of_get_flat_dt_prop(node, "reg", &l);
84 return *addr; /* return address */
87 /* this function is looking for early uartlite console - Microblaze specific */
88 int __init early_uartlite_console(void)
90 return of_scan_flat_dt(early_init_dt_scan_serial, NULL);
93 /* MS this is Microblaze specifig function */
94 static int __init early_init_dt_scan_serial_full(unsigned long node,
95 const char *uname, int depth, void *data)
101 pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
103 /* find all serial nodes */
104 if (strncmp(uname, "serial", 6) != 0)
107 early_init_dt_check_for_initrd(node);
109 /* find compatible node with uartlite */
110 p = of_get_flat_dt_prop(node, "compatible", &l);
112 if ((strncmp(p, "xlnx,xps-uart16550", 18) != 0) &&
113 (strncmp(p, "xlnx,axi-uart16550", 18) != 0))
116 addr = *(u32 *)of_get_flat_dt_prop(node, "reg", &l);
117 addr += *(u32 *)of_get_flat_dt_prop(node, "reg-offset", &l);
118 return addr; /* return address */
121 /* this function is looking for early uartlite console - Microblaze specific */
122 int __init early_uart16550_console(void)
124 return of_scan_flat_dt(early_init_dt_scan_serial_full, NULL);
128 void __init early_init_devtree(void *params)
130 pr_debug(" -> early_init_devtree(%p)\n", params);
132 /* Setup flat device-tree pointer */
133 initial_boot_params = params;
135 /* Retrieve various informations from the /chosen node of the
136 * device-tree, including the platform type, initrd location and
137 * size, TCE reserve, and more ...
139 of_scan_flat_dt(early_init_dt_scan_chosen, NULL);
141 /* Scan memory nodes and rebuild MEMBLOCKs */
143 of_scan_flat_dt(early_init_dt_scan_root, NULL);
144 of_scan_flat_dt(early_init_dt_scan_memory, NULL);
146 /* Save command line for /proc/cmdline and then parse parameters */
147 strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
152 pr_debug("Phys. mem: %lx\n", (unsigned long) memblock_phys_mem_size());
154 pr_debug(" <- early_init_devtree()\n");
157 #ifdef CONFIG_BLK_DEV_INITRD
158 void __init early_init_dt_setup_initrd_arch(unsigned long start,
161 initrd_start = (unsigned long)__va(start);
162 initrd_end = (unsigned long)__va(end);
163 initrd_below_start_ok = 1;
169 * New implementation of the OF "find" APIs, return a refcounted
170 * object, call of_node_put() when done. The device tree and list
171 * are protected by a rw_lock.
173 * Note that property management will need some locking as well,
174 * this isn't dealt with yet.
178 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
179 static struct debugfs_blob_wrapper flat_dt_blob;
181 static int __init export_flat_device_tree(void)
185 flat_dt_blob.data = initial_boot_params;
186 flat_dt_blob.size = initial_boot_params->totalsize;
188 d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
189 of_debugfs_root, &flat_dt_blob);
195 device_initcall(export_flat_device_tree);