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> |
5c9f303e | 33 | #include <linux/of_fdt.h> |
12e84142 MS |
34 | |
35 | #include <asm/prom.h> | |
36 | #include <asm/page.h> | |
37 | #include <asm/processor.h> | |
38 | #include <asm/irq.h> | |
39 | #include <linux/io.h> | |
12e84142 MS |
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 | 45 | #ifdef CONFIG_EARLY_PRINTK |
9d0c4dfe | 46 | static const char *stdout; |
12e84142 | 47 | |
c0d997fb | 48 | static int __init early_init_dt_scan_chosen_serial(unsigned long node, |
67f4aaa2 MS |
49 | const char *uname, int depth, void *data) |
50 | { | |
9d0c4dfe RH |
51 | int l; |
52 | const char *p; | |
67f4aaa2 | 53 | |
2aa8e375 MS |
54 | pr_debug("%s: depth: %d, uname: %s\n", __func__, depth, uname); |
55 | ||
56 | if (depth == 1 && (strcmp(uname, "chosen") == 0 || | |
57 | strcmp(uname, "chosen@0") == 0)) { | |
58 | p = of_get_flat_dt_prop(node, "linux,stdout-path", &l); | |
59 | if (p != NULL && l > 0) | |
60 | stdout = p; /* store pointer to stdout-path */ | |
61 | } | |
62 | ||
63 | if (stdout && strstr(stdout, uname)) { | |
64 | p = of_get_flat_dt_prop(node, "compatible", &l); | |
65 | pr_debug("Compatible string: %s\n", p); | |
66 | ||
67 | if ((strncmp(p, "xlnx,xps-uart16550", 18) == 0) || | |
68 | (strncmp(p, "xlnx,axi-uart16550", 18) == 0)) { | |
69 | unsigned int addr; | |
70 | ||
71 | *(u32 *)data = UART16550; | |
72 | ||
73 | addr = *(u32 *)of_get_flat_dt_prop(node, "reg", &l); | |
74 | addr += *(u32 *)of_get_flat_dt_prop(node, | |
75 | "reg-offset", &l); | |
76 | /* clear register offset */ | |
77 | return be32_to_cpu(addr) & ~3; | |
78 | } | |
79 | if ((strncmp(p, "xlnx,xps-uartlite", 17) == 0) || | |
80 | (strncmp(p, "xlnx,opb-uartlite", 17) == 0) || | |
ca12adc8 MS |
81 | (strncmp(p, "xlnx,axi-uartlite", 17) == 0) || |
82 | (strncmp(p, "xlnx,mdm", 8) == 0)) { | |
9d0c4dfe | 83 | const unsigned int *addrp; |
2aa8e375 MS |
84 | |
85 | *(u32 *)data = UARTLITE; | |
86 | ||
87 | addrp = of_get_flat_dt_prop(node, "reg", &l); | |
88 | return be32_to_cpup(addrp); /* return address */ | |
89 | } | |
90 | } | |
91 | return 0; | |
67f4aaa2 MS |
92 | } |
93 | ||
2aa8e375 MS |
94 | /* this function is looking for early console - Microblaze specific */ |
95 | int __init of_early_console(void *version) | |
67f4aaa2 | 96 | { |
2aa8e375 | 97 | return of_scan_flat_dt(early_init_dt_scan_chosen_serial, version); |
67f4aaa2 | 98 | } |
12e84142 MS |
99 | #endif |
100 | ||
101 | void __init early_init_devtree(void *params) | |
102 | { | |
103 | pr_debug(" -> early_init_devtree(%p)\n", params); | |
104 | ||
dc0b4335 RH |
105 | early_init_dt_scan(params); |
106 | if (!strlen(boot_command_line)) | |
107 | strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE); | |
12e84142 | 108 | |
12e84142 MS |
109 | parse_early_param(); |
110 | ||
1aadc056 | 111 | memblock_allow_resize(); |
12e84142 | 112 | |
95f72d1e | 113 | pr_debug("Phys. mem: %lx\n", (unsigned long) memblock_phys_mem_size()); |
12e84142 | 114 | |
12e84142 MS |
115 | pr_debug(" <- early_init_devtree()\n"); |
116 | } |