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/io.h>
   9#include <linux/init.h>
  10#include <linux/memblock.h>
  11#include <linux/serial_reg.h>
  12#include <asm/fw/fw.h>
  13
  14#include <loongson1.h>
  15
  16unsigned long memsize;
  17
  18void __init prom_init(void)
  19{
  20        void __iomem *uart_base;
  21
  22        fw_init_cmdline();
  23
  24        memsize = fw_getenvl("memsize");
  25        if(!memsize)
  26                memsize = DEFAULT_MEMSIZE;
  27
  28        if (strstr(arcs_cmdline, "console=ttyS3"))
  29                uart_base = ioremap(LS1X_UART3_BASE, 0x0f);
  30        else if (strstr(arcs_cmdline, "console=ttyS2"))
  31                uart_base = ioremap(LS1X_UART2_BASE, 0x0f);
  32        else if (strstr(arcs_cmdline, "console=ttyS1"))
  33                uart_base = ioremap(LS1X_UART1_BASE, 0x0f);
  34        else
  35                uart_base = ioremap(LS1X_UART0_BASE, 0x0f);
  36        setup_8250_early_printk_port((unsigned long)uart_base, 0, 0);
  37}
  38
  39void __init plat_mem_setup(void)
  40{
  41        memblock_add(0x0, (memsize << 20));
  42}
  43