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/* 68328serial.h: Definitions for the mc68328 serial driver.
* Copyright (C) 1995 David S. Miller <>
* Copyright (C) 1998 Kenneth Albanowski <>
* Copyright (C) 1998, 1999 D. Jeff Dionne <>
* Copyright (C) 1999 Vladimir Gurevich <>
* VZ Support/Fixes Evan Stawnyczy <>
#ifndef _MC683XX_SERIAL_H
#define _MC683XX_SERIAL_H
#include <linux/config.h>
struct serial_struct {
int type;
int line;
int port;
int irq;
int flags;
int xmit_fifo_size;
int custom_divisor;
int baud_base;
unsigned short close_delay;
char reserved_char[2];
int hub6; /* FIXME: We don't have AT&T Hub6 boards! */
unsigned short closing_wait; /* time to wait before closing */
unsigned short closing_wait2; /* no longer used... */
int reserved[4];
* For the close wait times, 0 means wait forever for serial port to
* flush its output. 65535 means don't wait at all.
#define S_CLOSING_WAIT_NONE 65535
* Definitions for S_struct (and serial_struct) flags field
#define S_HUP_NOTIFY 0x0001 /* Notify getty on hangups and closes
on the callout port */
#define S_FOURPORT 0x0002 /* Set OU1, OUT2 per AST Fourport settings */
#define S_SAK 0x0004 /* Secure Attention Key (Orange book) */
#define S_SPLIT_TERMIOS 0x0008 /* Separate termios for dialin/callout */
#define S_SPD_MASK 0x0030
#define S_SPD_HI 0x0010 /* Use 56000 instead of 38400 bps */
#define S_SPD_VHI 0x0020 /* Use 115200 instead of 38400 bps */
#define S_SPD_CUST 0x0030 /* Use user-specified divisor */
#define S_SKIP_TEST 0x0040 /* Skip UART test during autoconfiguration */
#define S_AUTO_IRQ 0x0080 /* Do automatic IRQ during autoconfiguration */
#define S_SESSION_LOCKOUT 0x0100 /* Lock out cua opens based on session */
#define S_PGRP_LOCKOUT 0x0200 /* Lock out cua opens based on pgrp */
#define S_CALLOUT_NOHUP 0x0400 /* Don't do hangups for cua device */
#define S_FLAGS 0x0FFF /* Possible legal S flags */
#define S_USR_MASK 0x0430 /* Legal flags that non-privileged
* users can set or reset */
/* Internal flags used only by kernel/chr_drv/serial.c */
#define S_INITIALIZED 0x80000000 /* Serial port was initialized */
#define S_CALLOUT_ACTIVE 0x40000000 /* Call out device is active */
#define S_NORMAL_ACTIVE 0x20000000 /* Normal device is active */
#define S_BOOT_AUTOCONF 0x10000000 /* Autoconfigure port on bootup */
#define S_CLOSING 0x08000000 /* Serial port is closing */
#define S_CTS_FLOW 0x04000000 /* Do CTS flow control */
#define S_CHECK_CD 0x02000000 /* i.e., CLOCAL */
/* Software state per channel */
#ifdef __KERNEL__
* I believe this is the optimal setting that reduces the number of interrupts.
* At high speeds the output might become a little "bursted" (use USTCNT_TXHE
* if that bothers you), but in most cases it will not, since we try to
* transmit characters every time rs_interrupt is called. Thus, quite often
* you'll see that a receive interrupt occures before the transmit one.
* -- Vladimir Gurevich
* 68328 and 68EZ328 UARTS are a little bit different. EZ328 has special
* "Old data interrupt" which occures whenever the data stay in the FIFO
* longer than 30 bits time. This allows us to use FIFO without compromising
* latency. '328 does not have this feature and without the real 328-based
* board I would assume that RXRE is the safest setting.
* For EZ328 I use RXHE (Half empty) interrupt to reduce the number of
* interrupts. RXFE (receive queue full) causes the system to lose data
* at least at 115200 baud
* If your board is busy doing other stuff, you might consider to use
* RXRE (data ready intrrupt) instead.
* The other option is to make these INTR masks run-time configurable, so
* that people can dynamically adapt them according to the current usage.
* -- Vladimir Gurevich
/* (es) */
#if defined(CONFIG_M68EZ328) || defined(CONFIG_M68VZ328)
#elif defined(CONFIG_M68328)
#error Please, define the Rx interrupt events for your CPU
/* (/es) */
* This is our internal structure for each serial port's state.
* Many fields are paralleled by the structure used by the serial_struct
* structure.
* For definitions of the flags field, see tty.h
struct m68k_serial {
char soft_carrier; /* Use soft carrier on this channel */
char break_abort; /* Is serial console in, so process brk/abrt */
char is_cons; /* Is this our console. */
/* We need to know the current clock divisor
* to read the bps rate the chip has currently
* loaded.
unsigned char clk_divisor; /* May be 1, 16, 32, or 64 */
int baud;
int magic;
int baud_base;
int port;
int irq;
int flags; /* defined in tty.h */
int type; /* UART type */
struct tty_struct *tty;
int read_status_mask;
int ignore_status_mask;
int timeout;
int xmit_fifo_size;
int custom_divisor;
int x_char; /* xon/xoff character */
int close_delay;
unsigned short closing_wait;
unsigned short closing_wait2;
unsigned long event;
unsigned long last_active;
int line;
int count; /* # of fd on device */
int blocked_open; /* # of blocked opens */
unsigned char *xmit_buf;
int xmit_head;
int xmit_tail;
int xmit_cnt;
struct work_struct tqueue;
struct work_struct tqueue_hangup;
wait_queue_head_t open_wait;
wait_queue_head_t close_wait;
#define SERIAL_MAGIC 0x5301
* The size of the serial xmit buffer is 1 page, or 4096 bytes
#define SERIAL_XMIT_SIZE 4096
* Events are used to schedule things to happen at timer-interrupt
* time, instead of at rs interrupt time.
* Define the number of ports supported and their irqs.
#ifndef CONFIG_68328_SERIAL_UART2
#define NR_PORTS 1
#define NR_PORTS 2
#endif /* __KERNEL__ */
#endif /* !(_MC683XX_SERIAL_H) */