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
  16 unsigned long memsize;
  17
  18 void __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
  39 void __init prom_free_prom_memory(void)
  40 {
  41 }
  42
  43 void __init plat_mem_setup(void)
  44 {
  45         memblock_add(0x0, (memsize << 20));
  46 }