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

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  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/serial_reg.h>
 11 #include <asm/bootinfo.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         add_memory_region(0x0, (memsize << 20), BOOT_MEM_RAM);
 46 }
 47 

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