1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (c) 2011 Zhang, Keguang <keguang.zhang@gmail.com>
5 * Modified from arch/mips/pnx833x/common/prom.c.
8 #include <linux/serial_reg.h>
9 #include <asm/bootinfo.h>
11 #include <loongson1.h>
15 char **prom_argv, **prom_envp;
16 unsigned long memsize, highmemsize;
18 char *prom_getenv(char *envname)
20 char **env = prom_envp;
26 if (strncmp(envname, *env, i) == 0 && *(*env + i) == '=')
34 static inline unsigned long env_or_default(char *env, unsigned long dfl)
36 char *str = prom_getenv(env);
37 return str ? simple_strtol(str, 0, 0) : dfl;
40 void __init prom_init_cmdline(void)
42 char *c = &(arcs_cmdline[0]);
45 for (i = 1; i < prom_argc; i++) {
46 strcpy(c, prom_argv[i]);
47 c += strlen(prom_argv[i]);
48 if (i < prom_argc - 1)
54 void __init prom_init(void)
56 void __iomem *uart_base;
58 prom_argv = (char **)fw_arg1;
59 prom_envp = (char **)fw_arg2;
63 memsize = env_or_default("memsize", DEFAULT_MEMSIZE);
64 highmemsize = env_or_default("highmemsize", 0x0);
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);
73 uart_base = ioremap_nocache(LS1X_UART0_BASE, 0x0f);
74 setup_8250_early_printk_port((unsigned long)uart_base, 0, 0);
77 void __init prom_free_prom_memory(void)