arch/mips/loongson2ef/common/uart_base.c

Source file repositories/reference/linux-study-clean/arch/mips/loongson2ef/common/uart_base.c

File Facts

System
Linux kernel
Corpus path
arch/mips/loongson2ef/common/uart_base.c
Extension
.c
Size
998 bytes
Lines
44
Domain
Architecture Layer
Bucket
arch/mips
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2009 Lemote Inc.
 * Author: Wu Zhangjin, wuzhangjin@gmail.com
 */

#include <linux/export.h>
#include <asm/bootinfo.h>
#include <asm/setup.h>

#include <loongson.h>

/* raw */
unsigned long loongson_uart_base;
/* ioremapped */
unsigned long _loongson_uart_base;

EXPORT_SYMBOL(loongson_uart_base);
EXPORT_SYMBOL(_loongson_uart_base);

void prom_init_loongson_uart_base(void)
{
	switch (mips_machtype) {
	case MACH_LEMOTE_FL2E:
		loongson_uart_base = LOONGSON_PCIIO_BASE + 0x3f8;
		break;
	case MACH_LEMOTE_FL2F:
	case MACH_LEMOTE_LL2F:
		loongson_uart_base = LOONGSON_PCIIO_BASE + 0x2f8;
		break;
	case MACH_LEMOTE_ML2F7:
	case MACH_LEMOTE_YL2F89:
	case MACH_DEXXON_GDIUM2F10:
	case MACH_LEMOTE_NAS:
	default:
		/* The CPU provided serial port (LPC) */
		loongson_uart_base = LOONGSON_LIO1_BASE + 0x3f8;
		break;
	}

	_loongson_uart_base = TO_UNCAC(loongson_uart_base);
	setup_8250_early_printk_port(_loongson_uart_base, 0, 1024);
}

Annotation

Implementation Notes