80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2011 Zhang, Keguang <keguang.zhang@gmail.com>
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*
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* Modified from arch/mips/pnx833x/common/prom.c.
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*/
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#include <linux/serial_reg.h>
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#include <asm/bootinfo.h>
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#include <loongson1.h>
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#include <prom.h>
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int prom_argc;
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char **prom_argv, **prom_envp;
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unsigned long memsize, highmemsize;
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char *prom_getenv(char *envname)
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{
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char **env = prom_envp;
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int i;
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i = strlen(envname);
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while (*env) {
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if (strncmp(envname, *env, i) == 0 && *(*env + i) == '=')
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return *env + i + 1;
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env++;
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}
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return 0;
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}
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static inline unsigned long env_or_default(char *env, unsigned long dfl)
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{
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char *str = prom_getenv(env);
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return str ? simple_strtol(str, 0, 0) : dfl;
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}
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void __init prom_init_cmdline(void)
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{
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char *c = &(arcs_cmdline[0]);
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int i;
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for (i = 1; i < prom_argc; i++) {
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strcpy(c, prom_argv[i]);
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c += strlen(prom_argv[i]);
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if (i < prom_argc - 1)
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*c++ = ' ';
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}
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*c = 0;
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}
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void __init prom_init(void)
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{
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void __iomem *uart_base;
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prom_argc = fw_arg0;
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prom_argv = (char **)fw_arg1;
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prom_envp = (char **)fw_arg2;
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prom_init_cmdline();
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memsize = env_or_default("memsize", DEFAULT_MEMSIZE);
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highmemsize = env_or_default("highmemsize", 0x0);
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if (strstr(arcs_cmdline, "console=ttyS3"))
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uart_base = ioremap_nocache(LS1X_UART3_BASE, 0x0f);
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else if (strstr(arcs_cmdline, "console=ttyS2"))
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uart_base = ioremap_nocache(LS1X_UART2_BASE, 0x0f);
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else if (strstr(arcs_cmdline, "console=ttyS1"))
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uart_base = ioremap_nocache(LS1X_UART1_BASE, 0x0f);
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else
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uart_base = ioremap_nocache(LS1X_UART0_BASE, 0x0f);
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setup_8250_early_printk_port((unsigned long)uart_base, 0, 0);
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}
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void __init prom_free_prom_memory(void)
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{
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}
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