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

   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
  14int prom_argc;
  15char **prom_argv, **prom_envp;
  16unsigned long memsize, highmemsize;
  17
  18char *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
  34static 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
  40void __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
  54void __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
  77void __init prom_free_prom_memory(void)
  78{
  79}
  80