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/* 68328serial.h: Definitions for the mc68328 serial driver.

 *

 * Copyright (C) 1995       David S. Miller    <davem@caip.rutgers.edu>

 * Copyright (C) 1998       Kenneth Albanowski <kjahds@kjahds.com>

 * Copyright (C) 1998, 1999 D. Jeff Dionne     <jeff@rt-control.com>

 * Copyright (C) 1999       Vladimir Gurevich  <vgurevic@cisco.com>

 *

 */

#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_INF      0

#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

 */

#define USTCNT_TX_INTR_MASK (USTCNT_TXEE)

/*

 * 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 loose 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

 */

#if defined(CONFIG_M68EZ328)

#define USTCNT_RX_INTR_MASK (USTCNT_RXHE | USTCNT_ODEN)

#elif defined(CONFIG_M68328)

#define USTCNT_RX_INTR_MASK (USTCNT_RXRE)

#else

#error Please, define the Rx interrupt events for your CPU

#endif

/*

 * 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 */

        long                    session; /* Session of opening process */

        long                    pgrp; /* pgrp of opening process */

        unsigned char           *xmit_buf;

        int                     xmit_head;

        int                     xmit_tail;

        int                     xmit_cnt;

        struct tq_struct        tqueue;

        struct tq_struct        tqueue_hangup;

        struct termios          normal_termios;

        struct termios          callout_termios;

        struct wait_queue       *open_wait;

        struct wait_queue       *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 RS_EVENT_WRITE_WAKEUP   0

#endif /* __KERNEL__ */

#endif /* !(_MC683XX_SERIAL_H) */