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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
ca585cf9 KC |
2 | /* |
3 | * Copyright (c) 2011 Zhang, Keguang <keguang.zhang@gmail.com> | |
4 | * | |
5 | * Modified from arch/mips/pnx833x/common/prom.c. | |
ca585cf9 KC |
6 | */ |
7 | ||
8 | #include <linux/serial_reg.h> | |
9 | #include <asm/bootinfo.h> | |
10 | ||
11 | #include <loongson1.h> | |
12 | #include <prom.h> | |
13 | ||
14 | int prom_argc; | |
15 | char **prom_argv, **prom_envp; | |
16 | unsigned long memsize, highmemsize; | |
17 | ||
18 | char *prom_getenv(char *envname) | |
19 | { | |
20 | char **env = prom_envp; | |
21 | int i; | |
22 | ||
23 | i = strlen(envname); | |
24 | ||
25 | while (*env) { | |
813c1410 | 26 | if (strncmp(envname, *env, i) == 0 && *(*env + i) == '=') |
ca585cf9 KC |
27 | return *env + i + 1; |
28 | env++; | |
29 | } | |
30 | ||
31 | return 0; | |
32 | } | |
33 | ||
34 | static inline unsigned long env_or_default(char *env, unsigned long dfl) | |
35 | { | |
36 | char *str = prom_getenv(env); | |
37 | return str ? simple_strtol(str, 0, 0) : dfl; | |
38 | } | |
39 | ||
40 | void __init prom_init_cmdline(void) | |
41 | { | |
42 | char *c = &(arcs_cmdline[0]); | |
43 | int i; | |
44 | ||
45 | for (i = 1; i < prom_argc; i++) { | |
46 | strcpy(c, prom_argv[i]); | |
47 | c += strlen(prom_argv[i]); | |
813c1410 | 48 | if (i < prom_argc - 1) |
ca585cf9 KC |
49 | *c++ = ' '; |
50 | } | |
51 | *c = 0; | |
52 | } | |
53 | ||
54 | void __init prom_init(void) | |
55 | { | |
813c1410 | 56 | void __iomem *uart_base; |
ca585cf9 KC |
57 | prom_argc = fw_arg0; |
58 | prom_argv = (char **)fw_arg1; | |
59 | prom_envp = (char **)fw_arg2; | |
60 | ||
61 | prom_init_cmdline(); | |
62 | ||
63 | memsize = env_or_default("memsize", DEFAULT_MEMSIZE); | |
64 | highmemsize = env_or_default("highmemsize", 0x0); | |
ca585cf9 | 65 | |
813c1410 KC |
66 | if (strstr(arcs_cmdline, "console=ttyS3")) |
67 | uart_base = ioremap_nocache(LS1X_UART3_BASE, 0x0f); | |
68 | else if (strstr(arcs_cmdline, "console=ttyS2")) | |
69 | uart_base = ioremap_nocache(LS1X_UART2_BASE, 0x0f); | |
70 | else if (strstr(arcs_cmdline, "console=ttyS1")) | |
71 | uart_base = ioremap_nocache(LS1X_UART1_BASE, 0x0f); | |
72 | else | |
73 | uart_base = ioremap_nocache(LS1X_UART0_BASE, 0x0f); | |
74 | setup_8250_early_printk_port((unsigned long)uart_base, 0, 0); | |
ca585cf9 KC |
75 | } |
76 | ||
813c1410 | 77 | void __init prom_free_prom_memory(void) |
ca585cf9 | 78 | { |
ca585cf9 | 79 | } |