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/*
* dz.h: Serial port driver for DECStations equiped
* with the DZ chipset.
*
* Copyright (C) 1998 Olivier A. D. Lebaillif
*
* Email: olivier.lebaillif@ifrsys.com
*
*/
#ifndef DZ_SERIAL_H
#define DZ_SERIAL_H
/*
* Definitions for the Control and Status Received.
*/
#define DZ_TRDY 0x8000 /* Transmitter empty */
#define DZ_TIE 0x4000 /* Transmitter Interrupt Enable */
#define DZ_RDONE 0x0080 /* Receiver data ready */
#define DZ_RIE 0x0040 /* Receive Interrupt Enable */
#define DZ_MSE 0x0020 /* Master Scan Enable */
#define DZ_CLR 0x0010 /* Master reset */
#define DZ_MAINT 0x0008 /* Loop Back Mode */
/*
* Definitions for the Received buffer.
*/
#define DZ_RBUF_MASK 0x00FF /* Data Mask in the Receive Buffer */
#define DZ_LINE_MASK 0x0300 /* Line Mask in the Receive Buffer */
#define DZ_DVAL 0x8000 /* Valid Data indicator */
#define DZ_OERR 0x4000 /* Overrun error indicator */
#define DZ_FERR 0x2000 /* Frame error indicator */
#define DZ_PERR 0x1000 /* Parity error indicator */
#define LINE(x) (x & DZ_LINE_MASK) >> 8 /* Get the line number from the input buffer */
#define UCHAR(x) (unsigned char)(x & DZ_RBUF_MASK)
/*
* Definitions for the Transmit Register.
*/
#define DZ_LINE_KEYBOARD 0x0001
#define DZ_LINE_MOUSE 0x0002
#define DZ_LINE_MODEM 0x0004
#define DZ_LINE_PRINTER 0x0008
#define DZ_MODEM_DTR 0x0400 /* DTR for the modem line (2) */
/*
* Definitions for the Modem Status Register.
*/
#define DZ_MODEM_DSR 0x0200 /* DSR for the modem line (2) */
/*
* Definitions for the Transmit Data Register.
*/
#define DZ_BRK0 0x0100 /* Break assertion for line 0 */
#define DZ_BRK1 0x0200 /* Break assertion for line 1 */
#define DZ_BRK2 0x0400 /* Break assertion for line 2 */
#define DZ_BRK3 0x0800 /* Break assertion for line 3 */
/*
* Definitions for the Line Parameter Register.
*/
#define DZ_KEYBOARD 0x0000 /* line 0 = keyboard */
#define DZ_MOUSE 0x0001 /* line 1 = mouse */
#define DZ_MODEM 0x0002 /* line 2 = modem */
#define DZ_PRINTER 0x0003 /* line 3 = printer */
#define DZ_CSIZE 0x0018 /* Number of bits per byte (mask) */
#define DZ_CS5 0x0000 /* 5 bits per byte */
#define DZ_CS6 0x0008 /* 6 bits per byte */
#define DZ_CS7 0x0010 /* 7 bits per byte */
#define DZ_CS8 0x0018 /* 8 bits per byte */
#define DZ_CSTOPB 0x0020 /* 2 stop bits instead of one */
#define DZ_PARENB 0x0040 /* Parity enable */
#define DZ_PARODD 0x0080 /* Odd parity instead of even */
#define DZ_CBAUD 0x0E00 /* Baud Rate (mask) */
#define DZ_B50 0x0000
#define DZ_B75 0x0100
#define DZ_B110 0x0200
#define DZ_B134 0x0300
#define DZ_B150 0x0400
#define DZ_B300 0x0500
#define DZ_B600 0x0600
#define DZ_B1200 0x0700
#define DZ_B1800 0x0800
#define DZ_B2000 0x0900
#define DZ_B2400 0x0A00
#define DZ_B3600 0x0B00
#define DZ_B4800 0x0C00
#define DZ_B7200 0x0D00
#define DZ_B9600 0x0E00
#define DZ_CREAD 0x1000 /* Enable receiver */
#define DZ_RXENAB 0x1000 /* enable receive char */
/*
* Addresses for the DZ registers
*/
#define DZ_CSR 0x00 /* Control and Status Register */
#define DZ_RBUF 0x08 /* Receive Buffer */
#define DZ_LPR 0x08 /* Line Parameters Register */
#define DZ_TCR 0x10 /* Transmitter Control Register */
#define DZ_MSR 0x18 /* Modem Status Register */
#define DZ_TDR 0x18 /* Transmit Data Register */
#define DZ_NB_PORT 4
#define DZ_XMIT_SIZE 4096 /* buffer size */
#define WAKEUP_CHARS DZ_XMIT_SIZE/4
#define DZ_EVENT_WRITE_WAKEUP 0
#ifndef MIN
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#define DZ_INITIALIZED 0x80000000 /* Serial port was initialized */
#define DZ_CALLOUT_ACTIVE 0x40000000 /* Call out device is active */
#define DZ_NORMAL_ACTIVE 0x20000000 /* Normal device is active */
#define DZ_BOOT_AUTOCONF 0x10000000 /* Autoconfigure port on bootup */
#define DZ_CLOSING 0x08000000 /* Serial port is closing */
#define DZ_CTS_FLOW 0x04000000 /* Do CTS flow control */
#define DZ_CHECK_CD 0x02000000 /* i.e., CLOCAL */
#define DZ_CLOSING_WAIT_INF 0
#define DZ_CLOSING_WAIT_NONE 65535
#define DZ_SPLIT_TERMIOS 0x0008 /* Separate termios for dialin/callout */
#define DZ_SESSION_LOCKOUT 0x0100 /* Lock out cua opens based on session */
#define DZ_PGRP_LOCKOUT 0x0200 /* Lock out cua opens based on pgrp */
struct dz_serial {
unsigned port; /* base address for the port */
int type;
int flags;
int baud_base;
int blocked_open;
unsigned short close_delay;
unsigned short closing_wait;
unsigned short line; /* port/line number */
unsigned short cflags; /* line configuration flag */
unsigned short x_char; /* xon/xoff character */
unsigned short read_status_mask; /* mask for read condition */
unsigned short ignore_status_mask; /* mask for ignore condition */
unsigned long event; /* mask used in BH */
unsigned char *xmit_buf; /* Transmit buffer */
int xmit_head; /* Position of the head */
int xmit_tail; /* Position of the tail */
int xmit_cnt; /* Count of the chars in the buffer */
int count; /* indicates how many times it has been opened */
int magic;
struct async_icount icount; /* keep track of things ... */
struct tty_struct *tty; /* tty associated */
struct tq_struct tqueue; /* Queue for BH */
struct tq_struct tqueue_hangup;
struct termios normal_termios;
struct termios callout_termios;
wait_queue_head_t open_wait;
wait_queue_head_t close_wait;
long session; /* Session of opening process */
long pgrp; /* pgrp of opening process */
unsigned char is_console; /* flag indicating a serial console */
unsigned char is_initialized;
};
static struct dz_serial multi[DZ_NB_PORT]; /* Four serial lines in the DZ chip */
static struct dz_serial *dz_console;
static struct tty_driver serial_driver, callout_driver;
static struct tty_struct *serial_table[DZ_NB_PORT];
static struct termios *serial_termios[DZ_NB_PORT];
static struct termios *serial_termios_locked[DZ_NB_PORT];
static int serial_refcount;
/*
* tmp_buf is used as a temporary buffer by serial_write. We need to
* lock it in case the copy_from_user blocks while swapping in a page,
* and some other program tries to do a serial write at the same time.
* Since the lock will only come under contention when the system is
* swapping and available memory is low, it makes sense to share one
* buffer across all the serial ports, since it significantly saves
* memory if large numbers of serial ports are open.
*/
static unsigned char *tmp_buf;
static DECLARE_MUTEX(tmp_buf_sem);
static char *dz_name = "DECstation DZ serial driver version ";
static char *dz_version = "1.02";
static inline unsigned short dz_in (struct dz_serial *, unsigned);
static inline void dz_out (struct dz_serial *, unsigned, unsigned short);
static inline void dz_sched_event (struct dz_serial *, int);
static inline void receive_chars (struct dz_serial *);
static inline void transmit_chars (struct dz_serial *);
static inline void check_modem_status (struct dz_serial *);
static void dz_stop (struct tty_struct *);
static void dz_start (struct tty_struct *);
static void dz_interrupt (int, void *, struct pt_regs *);
static void do_serial_bh (void);
static void do_softint (void *);
static void do_serial_hangup (void *);
static void change_speed (struct dz_serial *);
static void dz_flush_chars (struct tty_struct *);
static void dz_console_print (struct console *, const char *, unsigned int);
static void dz_flush_buffer (struct tty_struct *);
static void dz_throttle (struct tty_struct *);
static void dz_unthrottle (struct tty_struct *);
static void dz_send_xchar (struct tty_struct *, char);
static void shutdown (struct dz_serial *);
static void send_break (struct dz_serial *, int);
static void dz_set_termios (struct tty_struct *, struct termios *);
static void dz_close (struct tty_struct *, struct file *);
static void dz_hangup (struct tty_struct *);
static void show_serial_version (void);
static int dz_write (struct tty_struct *, int, const unsigned char *, int);
static int dz_write_room (struct tty_struct *);
static int dz_chars_in_buffer (struct tty_struct *);
static int startup (struct dz_serial *);
static int get_serial_info (struct dz_serial *, struct serial_struct *);
static int set_serial_info (struct dz_serial *, struct serial_struct *);
static int get_lsr_info (struct dz_serial *, unsigned int *);
static int dz_ioctl (struct tty_struct *, struct file *, unsigned int, unsigned long);
static int block_til_ready (struct tty_struct *, struct file *, struct dz_serial *);
static int dz_open (struct tty_struct *, struct file *);
#ifdef MODULE
int init_module (void)
void cleanup_module (void)
#endif
#endif
#endif /* DZ_SERIAL_H */
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