195 lines
6.1 KiB
C
195 lines
6.1 KiB
C
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/* 68328serial.h: Definitions for the mc68328 serial driver.
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*
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* Copyright (C) 1995 David S. Miller <davem@caip.rutgers.edu>
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* Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
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* Copyright (C) 1998, 1999 D. Jeff Dionne <jeff@uclinux.org>
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* Copyright (C) 1999 Vladimir Gurevich <vgurevic@cisco.com>
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*
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* VZ Support/Fixes Evan Stawnyczy <e@lineo.ca>
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*/
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#ifndef _MC683XX_SERIAL_H
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#define _MC683XX_SERIAL_H
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#include <linux/config.h>
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struct serial_struct {
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int type;
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int line;
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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 reserved_char[2];
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int hub6; /* FIXME: We don't have AT&T Hub6 boards! */
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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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int reserved[4];
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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 S_CLOSING_WAIT_INF 0
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#define S_CLOSING_WAIT_NONE 65535
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/*
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* Definitions for S_struct (and serial_struct) flags field
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*/
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#define S_HUP_NOTIFY 0x0001 /* Notify getty on hangups and closes
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on the callout port */
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#define S_FOURPORT 0x0002 /* Set OU1, OUT2 per AST Fourport settings */
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#define S_SAK 0x0004 /* Secure Attention Key (Orange book) */
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#define S_SPLIT_TERMIOS 0x0008 /* Separate termios for dialin/callout */
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#define S_SPD_MASK 0x0030
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#define S_SPD_HI 0x0010 /* Use 56000 instead of 38400 bps */
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#define S_SPD_VHI 0x0020 /* Use 115200 instead of 38400 bps */
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#define S_SPD_CUST 0x0030 /* Use user-specified divisor */
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#define S_SKIP_TEST 0x0040 /* Skip UART test during autoconfiguration */
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#define S_AUTO_IRQ 0x0080 /* Do automatic IRQ during autoconfiguration */
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#define S_SESSION_LOCKOUT 0x0100 /* Lock out cua opens based on session */
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#define S_PGRP_LOCKOUT 0x0200 /* Lock out cua opens based on pgrp */
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#define S_CALLOUT_NOHUP 0x0400 /* Don't do hangups for cua device */
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#define S_FLAGS 0x0FFF /* Possible legal S flags */
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#define S_USR_MASK 0x0430 /* 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 S_INITIALIZED 0x80000000 /* Serial port was initialized */
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#define S_CALLOUT_ACTIVE 0x40000000 /* Call out device is active */
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#define S_NORMAL_ACTIVE 0x20000000 /* Normal device is active */
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#define S_BOOT_AUTOCONF 0x10000000 /* Autoconfigure port on bootup */
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#define S_CLOSING 0x08000000 /* Serial port is closing */
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#define S_CTS_FLOW 0x04000000 /* Do CTS flow control */
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#define S_CHECK_CD 0x02000000 /* i.e., CLOCAL */
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/* Software state per channel */
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#ifdef __KERNEL__
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/*
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* I believe this is the optimal setting that reduces the number of interrupts.
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* At high speeds the output might become a little "bursted" (use USTCNT_TXHE
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* if that bothers you), but in most cases it will not, since we try to
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* transmit characters every time rs_interrupt is called. Thus, quite often
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* you'll see that a receive interrupt occures before the transmit one.
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* -- Vladimir Gurevich
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*/
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#define USTCNT_TX_INTR_MASK (USTCNT_TXEE)
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/*
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* 68328 and 68EZ328 UARTS are a little bit different. EZ328 has special
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* "Old data interrupt" which occures whenever the data stay in the FIFO
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* longer than 30 bits time. This allows us to use FIFO without compromising
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* latency. '328 does not have this feature and without the real 328-based
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* board I would assume that RXRE is the safest setting.
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*
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* For EZ328 I use RXHE (Half empty) interrupt to reduce the number of
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* interrupts. RXFE (receive queue full) causes the system to lose data
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* at least at 115200 baud
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*
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* If your board is busy doing other stuff, you might consider to use
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* RXRE (data ready intrrupt) instead.
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*
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* The other option is to make these INTR masks run-time configurable, so
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* that people can dynamically adapt them according to the current usage.
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* -- Vladimir Gurevich
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*/
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/* (es) */
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#if defined(CONFIG_M68EZ328) || defined(CONFIG_M68VZ328)
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#define USTCNT_RX_INTR_MASK (USTCNT_RXHE | USTCNT_ODEN)
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#elif defined(CONFIG_M68328)
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#define USTCNT_RX_INTR_MASK (USTCNT_RXRE)
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#else
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#error Please, define the Rx interrupt events for your CPU
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#endif
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/* (/es) */
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/*
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* This is our internal structure for each serial port's state.
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*
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* Many fields are paralleled by the structure used by the serial_struct
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* structure.
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*
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* For definitions of the flags field, see tty.h
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*/
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struct m68k_serial {
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char soft_carrier; /* Use soft carrier on this channel */
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char break_abort; /* Is serial console in, so process brk/abrt */
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char is_cons; /* Is this our console. */
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/* We need to know the current clock divisor
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* to read the bps rate the chip has currently
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* loaded.
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*/
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unsigned char clk_divisor; /* May be 1, 16, 32, or 64 */
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int baud;
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int magic;
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int baud_base;
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int port;
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int irq;
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int flags; /* defined in tty.h */
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int type; /* UART type */
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struct tty_struct *tty;
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int read_status_mask;
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int ignore_status_mask;
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int timeout;
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int xmit_fifo_size;
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int custom_divisor;
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int x_char; /* xon/xoff character */
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int close_delay;
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unsigned short closing_wait;
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unsigned short closing_wait2;
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unsigned long event;
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unsigned long last_active;
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int line;
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int count; /* # of fd on device */
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int blocked_open; /* # of blocked opens */
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unsigned char *xmit_buf;
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int xmit_head;
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int xmit_tail;
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int xmit_cnt;
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struct work_struct tqueue;
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struct work_struct tqueue_hangup;
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wait_queue_head_t open_wait;
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wait_queue_head_t close_wait;
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};
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#define SERIAL_MAGIC 0x5301
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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 4096
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/*
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* Events are used to schedule things to happen at timer-interrupt
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* time, instead of at rs interrupt time.
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*/
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#define RS_EVENT_WRITE_WAKEUP 0
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/*
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* Define the number of ports supported and their irqs.
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*/
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#ifndef CONFIG_68328_SERIAL_UART2
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#define NR_PORTS 1
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#define UART_IRQ_DEFNS {UART_IRQ_NUM}
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#else
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#define NR_PORTS 2
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#define UART_IRQ_DEFNS {UART1_IRQ_NUM, UART2_IRQ_NUM}
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#endif
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#endif /* __KERNEL__ */
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#endif /* !(_MC683XX_SERIAL_H) */
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