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Linux/arch/mips/loongson32/common/prom.c

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  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 

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