LXR linux/arch/mips/loongson32/common/prom.c

   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
  18int prom_argc;
  19char **prom_argv, **prom_envp;
  20unsigned long memsize, highmemsize;
  21
  22char *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
  38static 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
  44void __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
  58void __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
  81void __init prom_free_prom_memory(void)
  82{
  83}
  84