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 plat_mem_setup(void)
40 {
41 memblock_add(0x0, (memsize << 20));
42 }
43
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