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> | |
d64af918 | 17 | #include <linux/export.h> |
12e84142 MS |
18 | #include <linux/kernel.h> |
19 | #include <linux/string.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/threads.h> | |
22 | #include <linux/spinlock.h> | |
23 | #include <linux/types.h> | |
24 | #include <linux/pci.h> | |
25 | #include <linux/stringify.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/initrd.h> | |
28 | #include <linux/bitops.h> | |
12e84142 MS |
29 | #include <linux/kexec.h> |
30 | #include <linux/debugfs.h> | |
31 | #include <linux/irq.h> | |
95f72d1e | 32 | #include <linux/memblock.h> |
12e84142 MS |
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> | |
12e84142 MS |
39 | #include <asm/mmu.h> |
40 | #include <asm/pgtable.h> | |
12e84142 MS |
41 | #include <asm/sections.h> |
42 | #include <asm/pci-bridge.h> | |
43 | ||
12e84142 | 44 | #ifdef CONFIG_EARLY_PRINTK |
c0d997fb | 45 | static char *stdout; |
12e84142 | 46 | |
c0d997fb | 47 | static int __init early_init_dt_scan_chosen_serial(unsigned long node, |
67f4aaa2 MS |
48 | const char *uname, int depth, void *data) |
49 | { | |
50 | unsigned long l; | |
51 | char *p; | |
67f4aaa2 | 52 | |
2aa8e375 MS |
53 | pr_debug("%s: depth: %d, uname: %s\n", __func__, depth, uname); |
54 | ||
55 | if (depth == 1 && (strcmp(uname, "chosen") == 0 || | |
56 | strcmp(uname, "chosen@0") == 0)) { | |
57 | p = of_get_flat_dt_prop(node, "linux,stdout-path", &l); | |
58 | if (p != NULL && l > 0) | |
59 | stdout = p; /* store pointer to stdout-path */ | |
60 | } | |
61 | ||
62 | if (stdout && strstr(stdout, uname)) { | |
63 | p = of_get_flat_dt_prop(node, "compatible", &l); | |
64 | pr_debug("Compatible string: %s\n", p); | |
65 | ||
66 | if ((strncmp(p, "xlnx,xps-uart16550", 18) == 0) || | |
67 | (strncmp(p, "xlnx,axi-uart16550", 18) == 0)) { | |
68 | unsigned int addr; | |
69 | ||
70 | *(u32 *)data = UART16550; | |
71 | ||
72 | addr = *(u32 *)of_get_flat_dt_prop(node, "reg", &l); | |
73 | addr += *(u32 *)of_get_flat_dt_prop(node, | |
74 | "reg-offset", &l); | |
75 | /* clear register offset */ | |
76 | return be32_to_cpu(addr) & ~3; | |
77 | } | |
78 | if ((strncmp(p, "xlnx,xps-uartlite", 17) == 0) || | |
79 | (strncmp(p, "xlnx,opb-uartlite", 17) == 0) || | |
ca12adc8 MS |
80 | (strncmp(p, "xlnx,axi-uartlite", 17) == 0) || |
81 | (strncmp(p, "xlnx,mdm", 8) == 0)) { | |
2aa8e375 MS |
82 | unsigned int *addrp; |
83 | ||
84 | *(u32 *)data = UARTLITE; | |
85 | ||
86 | addrp = of_get_flat_dt_prop(node, "reg", &l); | |
87 | return be32_to_cpup(addrp); /* return address */ | |
88 | } | |
89 | } | |
90 | return 0; | |
67f4aaa2 MS |
91 | } |
92 | ||
2aa8e375 MS |
93 | /* this function is looking for early console - Microblaze specific */ |
94 | int __init of_early_console(void *version) | |
67f4aaa2 | 95 | { |
2aa8e375 | 96 | return of_scan_flat_dt(early_init_dt_scan_chosen_serial, version); |
67f4aaa2 | 97 | } |
12e84142 MS |
98 | #endif |
99 | ||
100 | void __init early_init_devtree(void *params) | |
101 | { | |
102 | pr_debug(" -> early_init_devtree(%p)\n", params); | |
103 | ||
dc0b4335 RH |
104 | early_init_dt_scan(params); |
105 | if (!strlen(boot_command_line)) | |
106 | strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE); | |
12e84142 | 107 | |
12e84142 MS |
108 | parse_early_param(); |
109 | ||
1aadc056 | 110 | memblock_allow_resize(); |
12e84142 | 111 | |
95f72d1e | 112 | pr_debug("Phys. mem: %lx\n", (unsigned long) memblock_phys_mem_size()); |
12e84142 | 113 | |
12e84142 MS |
114 | pr_debug(" <- early_init_devtree()\n"); |
115 | } | |
116 | ||
12e84142 MS |
117 | /******* |
118 | * | |
119 | * New implementation of the OF "find" APIs, return a refcounted | |
120 | * object, call of_node_put() when done. The device tree and list | |
121 | * are protected by a rw_lock. | |
122 | * | |
123 | * Note that property management will need some locking as well, | |
124 | * this isn't dealt with yet. | |
125 | * | |
126 | *******/ | |
127 | ||
12e84142 MS |
128 | #if defined(CONFIG_DEBUG_FS) && defined(DEBUG) |
129 | static struct debugfs_blob_wrapper flat_dt_blob; | |
130 | ||
131 | static int __init export_flat_device_tree(void) | |
132 | { | |
133 | struct dentry *d; | |
134 | ||
135 | flat_dt_blob.data = initial_boot_params; | |
136 | flat_dt_blob.size = initial_boot_params->totalsize; | |
137 | ||
138 | d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR, | |
139 | of_debugfs_root, &flat_dt_blob); | |
140 | if (!d) | |
141 | return 1; | |
142 | ||
143 | return 0; | |
144 | } | |
145 | device_initcall(export_flat_device_tree); | |
146 | #endif |