Commit | Line | Data |
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12e84142 MS |
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> | |
12e84142 MS |
42 | #include <asm/sections.h> |
43 | #include <asm/pci-bridge.h> | |
44 | ||
12e84142 MS |
45 | /* export that to outside world */ |
46 | struct device_node *of_chosen; | |
47 | ||
12e84142 MS |
48 | #define early_init_dt_scan_drconf_memory(node) 0 |
49 | ||
86e03221 | 50 | void __init early_init_dt_scan_chosen_arch(unsigned long node) |
12e84142 | 51 | { |
86e03221 | 52 | /* No Microblaze specific code here */ |
12e84142 MS |
53 | } |
54 | ||
12e84142 MS |
55 | static int __init early_init_dt_scan_memory(unsigned long node, |
56 | const char *uname, int depth, void *data) | |
57 | { | |
58 | char *type = of_get_flat_dt_prop(node, "device_type", NULL); | |
0f0b56c3 | 59 | __be32 *reg, *endp; |
12e84142 MS |
60 | unsigned long l; |
61 | ||
62 | /* Look for the ibm,dynamic-reconfiguration-memory node */ | |
63 | /* if (depth == 1 && | |
64 | strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0) | |
65 | return early_init_dt_scan_drconf_memory(node); | |
66 | */ | |
67 | /* We are scanning "memory" nodes only */ | |
68 | if (type == NULL) { | |
69 | /* | |
70 | * The longtrail doesn't have a device_type on the | |
71 | * /memory node, so look for the node called /memory@0. | |
72 | */ | |
73 | if (depth != 1 || strcmp(uname, "memory@0") != 0) | |
74 | return 0; | |
75 | } else if (strcmp(type, "memory") != 0) | |
76 | return 0; | |
77 | ||
0f0b56c3 | 78 | reg = (__be32 *)of_get_flat_dt_prop(node, "linux,usable-memory", &l); |
12e84142 | 79 | if (reg == NULL) |
0f0b56c3 | 80 | reg = (__be32 *)of_get_flat_dt_prop(node, "reg", &l); |
12e84142 MS |
81 | if (reg == NULL) |
82 | return 0; | |
83 | ||
0f0b56c3 | 84 | endp = reg + (l / sizeof(__be32)); |
12e84142 MS |
85 | |
86 | pr_debug("memory scan node %s, reg size %ld, data: %x %x %x %x,\n", | |
87 | uname, l, reg[0], reg[1], reg[2], reg[3]); | |
88 | ||
89 | while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { | |
90 | u64 base, size; | |
91 | ||
92 | base = dt_mem_next_cell(dt_root_addr_cells, ®); | |
93 | size = dt_mem_next_cell(dt_root_size_cells, ®); | |
94 | ||
95 | if (size == 0) | |
96 | continue; | |
97 | pr_debug(" - %llx , %llx\n", (unsigned long long)base, | |
98 | (unsigned long long)size); | |
99 | ||
100 | lmb_add(base, size); | |
101 | } | |
102 | return 0; | |
103 | } | |
104 | ||
12e84142 MS |
105 | #ifdef CONFIG_EARLY_PRINTK |
106 | /* MS this is Microblaze specifig function */ | |
107 | static int __init early_init_dt_scan_serial(unsigned long node, | |
108 | const char *uname, int depth, void *data) | |
109 | { | |
110 | unsigned long l; | |
111 | char *p; | |
112 | int *addr; | |
113 | ||
114 | pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); | |
115 | ||
116 | /* find all serial nodes */ | |
117 | if (strncmp(uname, "serial", 6) != 0) | |
118 | return 0; | |
119 | ||
120 | early_init_dt_check_for_initrd(node); | |
121 | ||
122 | /* find compatible node with uartlite */ | |
123 | p = of_get_flat_dt_prop(node, "compatible", &l); | |
124 | if ((strncmp(p, "xlnx,xps-uartlite", 17) != 0) && | |
125 | (strncmp(p, "xlnx,opb-uartlite", 17) != 0)) | |
126 | return 0; | |
127 | ||
128 | addr = of_get_flat_dt_prop(node, "reg", &l); | |
129 | return *addr; /* return address */ | |
130 | } | |
131 | ||
132 | /* this function is looking for early uartlite console - Microblaze specific */ | |
133 | int __init early_uartlite_console(void) | |
134 | { | |
135 | return of_scan_flat_dt(early_init_dt_scan_serial, NULL); | |
136 | } | |
137 | #endif | |
138 | ||
139 | void __init early_init_devtree(void *params) | |
140 | { | |
141 | pr_debug(" -> early_init_devtree(%p)\n", params); | |
142 | ||
143 | /* Setup flat device-tree pointer */ | |
144 | initial_boot_params = params; | |
145 | ||
12e84142 MS |
146 | /* Retrieve various informations from the /chosen node of the |
147 | * device-tree, including the platform type, initrd location and | |
148 | * size, TCE reserve, and more ... | |
149 | */ | |
150 | of_scan_flat_dt(early_init_dt_scan_chosen, NULL); | |
151 | ||
152 | /* Scan memory nodes and rebuild LMBs */ | |
153 | lmb_init(); | |
154 | of_scan_flat_dt(early_init_dt_scan_root, NULL); | |
155 | of_scan_flat_dt(early_init_dt_scan_memory, NULL); | |
156 | ||
157 | /* Save command line for /proc/cmdline and then parse parameters */ | |
158 | strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE); | |
159 | parse_early_param(); | |
160 | ||
161 | lmb_analyze(); | |
162 | ||
163 | pr_debug("Phys. mem: %lx\n", (unsigned long) lmb_phys_mem_size()); | |
164 | ||
12e84142 MS |
165 | pr_debug(" <- early_init_devtree()\n"); |
166 | } | |
167 | ||
12e84142 MS |
168 | /******* |
169 | * | |
170 | * New implementation of the OF "find" APIs, return a refcounted | |
171 | * object, call of_node_put() when done. The device tree and list | |
172 | * are protected by a rw_lock. | |
173 | * | |
174 | * Note that property management will need some locking as well, | |
175 | * this isn't dealt with yet. | |
176 | * | |
177 | *******/ | |
178 | ||
179 | /** | |
180 | * of_find_node_by_phandle - Find a node given a phandle | |
181 | * @handle: phandle of the node to find | |
182 | * | |
183 | * Returns a node pointer with refcount incremented, use | |
184 | * of_node_put() on it when done. | |
185 | */ | |
186 | struct device_node *of_find_node_by_phandle(phandle handle) | |
187 | { | |
188 | struct device_node *np; | |
189 | ||
190 | read_lock(&devtree_lock); | |
191 | for (np = allnodes; np != NULL; np = np->allnext) | |
6016a363 | 192 | if (np->phandle == handle) |
12e84142 MS |
193 | break; |
194 | of_node_get(np); | |
195 | read_unlock(&devtree_lock); | |
196 | return np; | |
197 | } | |
198 | EXPORT_SYMBOL(of_find_node_by_phandle); | |
199 | ||
12e84142 MS |
200 | #if defined(CONFIG_DEBUG_FS) && defined(DEBUG) |
201 | static struct debugfs_blob_wrapper flat_dt_blob; | |
202 | ||
203 | static int __init export_flat_device_tree(void) | |
204 | { | |
205 | struct dentry *d; | |
206 | ||
207 | flat_dt_blob.data = initial_boot_params; | |
208 | flat_dt_blob.size = initial_boot_params->totalsize; | |
209 | ||
210 | d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR, | |
211 | of_debugfs_root, &flat_dt_blob); | |
212 | if (!d) | |
213 | return 1; | |
214 | ||
215 | return 0; | |
216 | } | |
217 | device_initcall(export_flat_device_tree); | |
218 | #endif |