1 /* 2 * Copyright (c) 2011 Zhang, Keguang <keguang.zhang@gmail.com> 3 * 4 * Modified from arch/mips/pnx833x/common/prom.c. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation; either version 2 of the License, or (at your 9 * option) any later version. 10 */ 11 12 #include <linux/serial_reg.h> 13 #include <asm/bootinfo.h> 14 15 #include <loongson1.h> 16 #include <prom.h> 17 18 int prom_argc; 19 char **prom_argv, **prom_envp; 20 unsigned long memsize, highmemsize; 21 22 char *prom_getenv(char *envname) 23 { 24 char **env = prom_envp; 25 int i; 26 27 i = strlen(envname); 28 29 while (*env) { 30 if (strncmp(envname, *env, i) == 0 && *(*env + i) == '=') 31 return *env + i + 1; 32 env++; 33 } 34 35 return 0; 36 } 37 38 static inline unsigned long env_or_default(char *env, unsigned long dfl) 39 { 40 char *str = prom_getenv(env); 41 return str ? simple_strtol(str, 0, 0) : dfl; 42 } 43 44 void __init prom_init_cmdline(void) 45 { 46 char *c = &(arcs_cmdline[0]); 47 int i; 48 49 for (i = 1; i < prom_argc; i++) { 50 strcpy(c, prom_argv[i]); 51 c += strlen(prom_argv[i]); 52 if (i < prom_argc - 1) 53 *c++ = ' '; 54 } 55 *c = 0; 56 } 57 58 void __init prom_init(void) 59 { 60 void __iomem *uart_base; 61 prom_argc = fw_arg0; 62 prom_argv = (char **)fw_arg1; 63 prom_envp = (char **)fw_arg2; 64 65 prom_init_cmdline(); 66 67 memsize = env_or_default("memsize", DEFAULT_MEMSIZE); 68 highmemsize = env_or_default("highmemsize", 0x0); 69 70 if (strstr(arcs_cmdline, "console=ttyS3")) 71 uart_base = ioremap_nocache(LS1X_UART3_BASE, 0x0f); 72 else if (strstr(arcs_cmdline, "console=ttyS2")) 73 uart_base = ioremap_nocache(LS1X_UART2_BASE, 0x0f); 74 else if (strstr(arcs_cmdline, "console=ttyS1")) 75 uart_base = ioremap_nocache(LS1X_UART1_BASE, 0x0f); 76 else 77 uart_base = ioremap_nocache(LS1X_UART0_BASE, 0x0f); 78 setup_8250_early_printk_port((unsigned long)uart_base, 0, 0); 79 } 80 81 void __init prom_free_prom_memory(void) 82 { 83 } 84