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 | ||
86e03221 | 48 | void __init early_init_dt_scan_chosen_arch(unsigned long node) |
12e84142 | 49 | { |
86e03221 | 50 | /* No Microblaze specific code here */ |
12e84142 MS |
51 | } |
52 | ||
51975db0 | 53 | void __init early_init_dt_add_memory_arch(u64 base, u64 size) |
12e84142 | 54 | { |
51975db0 | 55 | lmb_add(base, size); |
12e84142 MS |
56 | } |
57 | ||
12e84142 MS |
58 | #ifdef CONFIG_EARLY_PRINTK |
59 | /* MS this is Microblaze specifig function */ | |
60 | static int __init early_init_dt_scan_serial(unsigned long node, | |
61 | const char *uname, int depth, void *data) | |
62 | { | |
63 | unsigned long l; | |
64 | char *p; | |
65 | int *addr; | |
66 | ||
67 | pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); | |
68 | ||
69 | /* find all serial nodes */ | |
70 | if (strncmp(uname, "serial", 6) != 0) | |
71 | return 0; | |
72 | ||
73 | early_init_dt_check_for_initrd(node); | |
74 | ||
75 | /* find compatible node with uartlite */ | |
76 | p = of_get_flat_dt_prop(node, "compatible", &l); | |
77 | if ((strncmp(p, "xlnx,xps-uartlite", 17) != 0) && | |
78 | (strncmp(p, "xlnx,opb-uartlite", 17) != 0)) | |
79 | return 0; | |
80 | ||
81 | addr = of_get_flat_dt_prop(node, "reg", &l); | |
82 | return *addr; /* return address */ | |
83 | } | |
84 | ||
85 | /* this function is looking for early uartlite console - Microblaze specific */ | |
86 | int __init early_uartlite_console(void) | |
87 | { | |
88 | return of_scan_flat_dt(early_init_dt_scan_serial, NULL); | |
89 | } | |
90 | #endif | |
91 | ||
92 | void __init early_init_devtree(void *params) | |
93 | { | |
94 | pr_debug(" -> early_init_devtree(%p)\n", params); | |
95 | ||
96 | /* Setup flat device-tree pointer */ | |
97 | initial_boot_params = params; | |
98 | ||
12e84142 MS |
99 | /* Retrieve various informations from the /chosen node of the |
100 | * device-tree, including the platform type, initrd location and | |
101 | * size, TCE reserve, and more ... | |
102 | */ | |
103 | of_scan_flat_dt(early_init_dt_scan_chosen, NULL); | |
104 | ||
105 | /* Scan memory nodes and rebuild LMBs */ | |
106 | lmb_init(); | |
107 | of_scan_flat_dt(early_init_dt_scan_root, NULL); | |
108 | of_scan_flat_dt(early_init_dt_scan_memory, NULL); | |
109 | ||
110 | /* Save command line for /proc/cmdline and then parse parameters */ | |
111 | strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE); | |
112 | parse_early_param(); | |
113 | ||
114 | lmb_analyze(); | |
115 | ||
116 | pr_debug("Phys. mem: %lx\n", (unsigned long) lmb_phys_mem_size()); | |
117 | ||
12e84142 MS |
118 | pr_debug(" <- early_init_devtree()\n"); |
119 | } | |
120 | ||
1406bc2f JK |
121 | #ifdef CONFIG_BLK_DEV_INITRD |
122 | void __init early_init_dt_setup_initrd_arch(unsigned long start, | |
123 | unsigned long end) | |
124 | { | |
125 | initrd_start = (unsigned long)__va(start); | |
126 | initrd_end = (unsigned long)__va(end); | |
127 | initrd_below_start_ok = 1; | |
128 | } | |
129 | #endif | |
130 | ||
12e84142 MS |
131 | /******* |
132 | * | |
133 | * New implementation of the OF "find" APIs, return a refcounted | |
134 | * object, call of_node_put() when done. The device tree and list | |
135 | * are protected by a rw_lock. | |
136 | * | |
137 | * Note that property management will need some locking as well, | |
138 | * this isn't dealt with yet. | |
139 | * | |
140 | *******/ | |
141 | ||
12e84142 MS |
142 | #if defined(CONFIG_DEBUG_FS) && defined(DEBUG) |
143 | static struct debugfs_blob_wrapper flat_dt_blob; | |
144 | ||
145 | static int __init export_flat_device_tree(void) | |
146 | { | |
147 | struct dentry *d; | |
148 | ||
149 | flat_dt_blob.data = initial_boot_params; | |
150 | flat_dt_blob.size = initial_boot_params->totalsize; | |
151 | ||
152 | d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR, | |
153 | of_debugfs_root, &flat_dt_blob); | |
154 | if (!d) | |
155 | return 1; | |
156 | ||
157 | return 0; | |
158 | } | |
159 | device_initcall(export_flat_device_tree); | |
160 | #endif |