1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (c) 2011 Zhang, Keguang <keguang.zhang@gmail.com> 4 * 5 * Modified from arch/mips/pnx833x/common/prom.c. 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) { 26 if (strncmp(envname, *env, i) == 0 && *(*env + i) == '=') 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]); 48 if (i < prom_argc - 1) 49 *c++ = ' '; 50 } 51 *c = 0; 52 } 53 54 void __init prom_init(void) 55 { 56 void __iomem *uart_base; 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); 65 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); 75 } 76 77 void __init prom_free_prom_memory(void) 78 { 79 } 80