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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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18a8bd949d
Beacuse SERIAL_PORT_DFNS is removed from include/asm-i386/serial.h and include/asm-x86_64/serial.h. the serial8250_ports need to be probed late in serial initializing stage. the console_init=>serial8250_console_init=> register_console=>serial8250_console_setup will return -ENDEV, and console ttyS0 can not be enabled at that time. need to wait till uart_add_one_port in drivers/serial/serial_core.c to call register_console to get console ttyS0. that is too late. Make early_uart to use early_param, so uart console can be used earlier. Make it to be bootconsole with CON_BOOT flag, so can use console handover feature. and it will switch to corresponding normal serial console automatically. new command line will be: console=uart8250,io,0x3f8,9600n8 console=uart8250,mmio,0xff5e0000,115200n8 or earlycon=uart8250,io,0x3f8,9600n8 earlycon=uart8250,mmio,0xff5e0000,115200n8 it will print in very early stage: Early serial console at I/O port 0x3f8 (options '9600n8') console [uart0] enabled later for console it will print: console handover: boot [uart0] -> real [ttyS0] Signed-off-by: <yinghai.lu@sun.com> Cc: Andi Kleen <ak@suse.de> Cc: Bjorn Helgaas <bjorn.helgaas@hp.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Gerd Hoffmann <kraxel@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
182 lines
5.0 KiB
C
182 lines
5.0 KiB
C
/*
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* include/linux/serial.h
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*
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* Copyright (C) 1992 by Theodore Ts'o.
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*
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* Redistribution of this file is permitted under the terms of the GNU
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* Public License (GPL)
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*/
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#ifndef _LINUX_SERIAL_H
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#define _LINUX_SERIAL_H
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#ifdef __KERNEL__
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#include <linux/types.h>
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#include <asm/page.h>
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/*
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* Counters of the input lines (CTS, DSR, RI, CD) interrupts
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*/
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struct async_icount {
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__u32 cts, dsr, rng, dcd, tx, rx;
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__u32 frame, parity, overrun, brk;
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__u32 buf_overrun;
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};
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/*
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* The size of the serial xmit buffer is 1 page, or 4096 bytes
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*/
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#define SERIAL_XMIT_SIZE PAGE_SIZE
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#endif
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struct serial_struct {
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int type;
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int line;
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unsigned int port;
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int irq;
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int flags;
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int xmit_fifo_size;
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int custom_divisor;
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int baud_base;
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unsigned short close_delay;
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char io_type;
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char reserved_char[1];
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int hub6;
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unsigned short closing_wait; /* time to wait before closing */
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unsigned short closing_wait2; /* no longer used... */
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unsigned char *iomem_base;
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unsigned short iomem_reg_shift;
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unsigned int port_high;
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unsigned long iomap_base; /* cookie passed into ioremap */
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};
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/*
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* For the close wait times, 0 means wait forever for serial port to
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* flush its output. 65535 means don't wait at all.
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*/
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#define ASYNC_CLOSING_WAIT_INF 0
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#define ASYNC_CLOSING_WAIT_NONE 65535
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/*
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* These are the supported serial types.
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*/
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#define PORT_UNKNOWN 0
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#define PORT_8250 1
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#define PORT_16450 2
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#define PORT_16550 3
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#define PORT_16550A 4
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#define PORT_CIRRUS 5 /* usurped by cyclades.c */
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#define PORT_16650 6
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#define PORT_16650V2 7
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#define PORT_16750 8
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#define PORT_STARTECH 9 /* usurped by cyclades.c */
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#define PORT_16C950 10 /* Oxford Semiconductor */
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#define PORT_16654 11
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#define PORT_16850 12
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#define PORT_RSA 13 /* RSA-DV II/S card */
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#define PORT_MAX 13
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#define SERIAL_IO_PORT 0
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#define SERIAL_IO_HUB6 1
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#define SERIAL_IO_MEM 2
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struct serial_uart_config {
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char *name;
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int dfl_xmit_fifo_size;
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int flags;
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};
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#define UART_CLEAR_FIFO 0x01
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#define UART_USE_FIFO 0x02
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#define UART_STARTECH 0x04
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#define UART_NATSEMI 0x08
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/*
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* Definitions for async_struct (and serial_struct) flags field
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*/
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#define ASYNC_HUP_NOTIFY 0x0001 /* Notify getty on hangups and closes
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on the callout port */
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#define ASYNC_FOURPORT 0x0002 /* Set OU1, OUT2 per AST Fourport settings */
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#define ASYNC_SAK 0x0004 /* Secure Attention Key (Orange book) */
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#define ASYNC_SPLIT_TERMIOS 0x0008 /* Separate termios for dialin/callout */
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#define ASYNC_SPD_MASK 0x1030
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#define ASYNC_SPD_HI 0x0010 /* Use 56000 instead of 38400 bps */
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#define ASYNC_SPD_VHI 0x0020 /* Use 115200 instead of 38400 bps */
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#define ASYNC_SPD_CUST 0x0030 /* Use user-specified divisor */
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#define ASYNC_SKIP_TEST 0x0040 /* Skip UART test during autoconfiguration */
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#define ASYNC_AUTO_IRQ 0x0080 /* Do automatic IRQ during autoconfiguration */
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#define ASYNC_SESSION_LOCKOUT 0x0100 /* Lock out cua opens based on session */
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#define ASYNC_PGRP_LOCKOUT 0x0200 /* Lock out cua opens based on pgrp */
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#define ASYNC_CALLOUT_NOHUP 0x0400 /* Don't do hangups for cua device */
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#define ASYNC_HARDPPS_CD 0x0800 /* Call hardpps when CD goes high */
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#define ASYNC_SPD_SHI 0x1000 /* Use 230400 instead of 38400 bps */
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#define ASYNC_SPD_WARP 0x1010 /* Use 460800 instead of 38400 bps */
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#define ASYNC_LOW_LATENCY 0x2000 /* Request low latency behaviour */
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#define ASYNC_BUGGY_UART 0x4000 /* This is a buggy UART, skip some safety
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* checks. Note: can be dangerous! */
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#define ASYNC_AUTOPROBE 0x8000 /* Port was autoprobed by PCI or PNP code */
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#define ASYNC_FLAGS 0x7FFF /* Possible legal async flags */
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#define ASYNC_USR_MASK 0x3430 /* Legal flags that non-privileged
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* users can set or reset */
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/* Internal flags used only by kernel/chr_drv/serial.c */
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#define ASYNC_INITIALIZED 0x80000000 /* Serial port was initialized */
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#define ASYNC_NORMAL_ACTIVE 0x20000000 /* Normal device is active */
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#define ASYNC_BOOT_AUTOCONF 0x10000000 /* Autoconfigure port on bootup */
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#define ASYNC_CLOSING 0x08000000 /* Serial port is closing */
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#define ASYNC_CTS_FLOW 0x04000000 /* Do CTS flow control */
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#define ASYNC_CHECK_CD 0x02000000 /* i.e., CLOCAL */
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#define ASYNC_SHARE_IRQ 0x01000000 /* for multifunction cards
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--- no longer used */
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#define ASYNC_CONS_FLOW 0x00800000 /* flow control for console */
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#define ASYNC_BOOT_ONLYMCA 0x00400000 /* Probe only if MCA bus */
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#define ASYNC_INTERNAL_FLAGS 0xFFC00000 /* Internal flags */
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/*
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* Multiport serial configuration structure --- external structure
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*/
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struct serial_multiport_struct {
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int irq;
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int port1;
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unsigned char mask1, match1;
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int port2;
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unsigned char mask2, match2;
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int port3;
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unsigned char mask3, match3;
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int port4;
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unsigned char mask4, match4;
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int port_monitor;
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int reserved[32];
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};
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/*
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* Serial input interrupt line counters -- external structure
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* Four lines can interrupt: CTS, DSR, RI, DCD
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*/
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struct serial_icounter_struct {
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int cts, dsr, rng, dcd;
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int rx, tx;
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int frame, overrun, parity, brk;
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int buf_overrun;
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int reserved[9];
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};
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#ifdef __KERNEL__
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#include <linux/compiler.h>
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#endif /* __KERNEL__ */
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#endif /* _LINUX_SERIAL_H */
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