/* * 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 #define SERIAL_MAGIC 0x5301 /* * 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 */