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Commit 9399575d authored by Maciej W. Rozycki's avatar Maciej W. Rozycki Committed by Linus Torvalds
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[PATCH] dz: Fixes to make it work 

This a set of fixes mostly to make the driver actually work:

1. Actually select the line for setting parameters and receiver
   disable/enable.
2. Select the line for receive and transmit interrupt handling correctly.
3. Report the transmitter empty state correctly.
4. Set the I/O type of ports correctly.
5. Perform polled transmission correctly.
6. Don't fix the console line at ttyS3.
7. Magic SysRq support.
8. Various small bits here and there.

Tested with a DECstation 2100 (thanks Flo for making this possible).

[akpm@osdl.org: fix typo]
Signed-off-by: default avatarMaciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent f7dff2b1
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Inline Side-by-side
Showing with 212 additions and 229 deletions
drivers/char/decserial.c
View file @ 9399575d
......@@ -23,20 +23,12 @@
extern int zs_init(void);
#endif
#ifdef CONFIG_DZ
extern int dz_init(void);
#endif
#ifdef CONFIG_SERIAL_CONSOLE
#ifdef CONFIG_ZS
extern void zs_serial_console_init(void);
#endif
#ifdef CONFIG_DZ
extern void dz_serial_console_init(void);
#endif
#endif
/* rs_init - starts up the serial interface -
......@@ -46,23 +38,11 @@ extern void dz_serial_console_init(void);
int __init rs_init(void)
{
#if defined(CONFIG_ZS) && defined(CONFIG_DZ)
#ifdef CONFIG_ZS
if (IOASIC)
return zs_init();
else
return dz_init();
#else
#ifdef CONFIG_ZS
return zs_init();
#endif
#ifdef CONFIG_DZ
return dz_init();
#endif
#endif
return -ENXIO;
}
__initcall(rs_init);
......@@ -76,21 +56,9 @@ __initcall(rs_init);
*/
static int __init decserial_console_init(void)
{
#if defined(CONFIG_ZS) && defined(CONFIG_DZ)
#ifdef CONFIG_ZS
if (IOASIC)
zs_serial_console_init();
else
dz_serial_console_init();
#else
#ifdef CONFIG_ZS
zs_serial_console_init();
#endif
#ifdef CONFIG_DZ
dz_serial_console_init();
#endif
#endif
return 0;
}
......
drivers/serial/dz.c
View file @ 9399575d
/*
* dz.c: Serial port driver for DECStations equiped
* dz.c: Serial port driver for DECstations equipped
* with the DZ chipset.
*
* Copyright (C) 1998 Olivier A. D. Lebaillif
*
* Email: olivier.lebaillif@ifrsys.com
*
* Copyright (C) 2004, 2006 Maciej W. Rozycki
*
* [31-AUG-98] triemer
* Changed IRQ to use Harald's dec internals interrupts.h
* removed base_addr code - moving address assignment to setup.c
......@@ -26,10 +28,16 @@
#undef DEBUG_DZ
#if defined(CONFIG_SERIAL_DZ_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/sysrq.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial_core.h>
......@@ -45,14 +53,10 @@
#include <asm/system.h>
#include <asm/uaccess.h>
#define CONSOLE_LINE (3) /* for definition of struct console */
#include "dz.h"
#define DZ_INTR_DEBUG 1
static char *dz_name = "DECstation DZ serial driver version ";
static char *dz_version = "1.02";
static char *dz_version = "1.03";
struct dz_port {
struct uart_port port;
......@@ -61,22 +65,6 @@ struct dz_port {
static struct dz_port dz_ports[DZ_NB_PORT];
#ifdef DEBUG_DZ
/*
* debugging code to send out chars via prom
*/
static void debug_console(const char *s, int count)
{
unsigned i;
for (i = 0; i < count; i++) {
if (*s == 10)
prom_printf("%c", 13);
prom_printf("%c", *s++);
}
}
#endif
/*
* ------------------------------------------------------------
* dz_in () and dz_out ()
......@@ -90,6 +78,7 @@ static inline unsigned short dz_in(struct dz_port *dport, unsigned offset)
{
volatile unsigned short *addr =
(volatile unsigned short *) (dport->port.membase + offset);
return *addr;
}
......@@ -98,6 +87,7 @@ static inline void dz_out(struct dz_port *dport, unsigned offset,
{
volatile unsigned short *addr =
(volatile unsigned short *) (dport->port.membase + offset);
*addr = value;
}
......@@ -144,7 +134,7 @@ static void dz_stop_rx(struct uart_port *uport)
spin_lock_irqsave(&dport->port.lock, flags);
dport->cflag &= ~DZ_CREAD;
dz_out(dport, DZ_LPR, dport->cflag);
dz_out(dport, DZ_LPR, dport->cflag | dport->port.line);
spin_unlock_irqrestore(&dport->port.lock, flags);
}
......@@ -155,14 +145,14 @@ static void dz_enable_ms(struct uart_port *port)
/*
* ------------------------------------------------------------
* Here starts the interrupt handling routines. All of the
* following subroutines are declared as inline and are folded
* into dz_interrupt. They were separated out for readability's
* sake.
*
* Note: rs_interrupt() is a "fast" interrupt, which means that it
* Here start the interrupt handling routines. All of the following
* subroutines are declared as inline and are folded into
* dz_interrupt. They were separated out for readability's sake.
*
* Note: dz_interrupt() is a "fast" interrupt, which means that it
* runs with interrupts turned off. People who may want to modify
* rs_interrupt() should try to keep the interrupt handler as fast as
* dz_interrupt() should try to keep the interrupt handler as fast as
* possible. After you are done making modifications, it is not a bad
* idea to do:
*
......@@ -180,92 +170,74 @@ static void dz_enable_ms(struct uart_port *port)
* This routine deals with inputs from any lines.
* ------------------------------------------------------------
*/
static inline void dz_receive_chars(struct dz_port *dport)
static inline void dz_receive_chars(struct dz_port *dport_in,
struct pt_regs *regs)
{
struct dz_port *dport;
struct tty_struct *tty = NULL;
struct uart_icount *icount;
int ignore = 0;
unsigned short status, tmp;
int lines_rx[DZ_NB_PORT] = { [0 ... DZ_NB_PORT - 1] = 0 };
unsigned short status;
unsigned char ch, flag;
int i;
/* this code is going to be a problem...
the call to tty_flip_buffer is going to need
to be rethought...
*/
do {
status = dz_in(dport, DZ_RBUF);
/* punt so we don't get duplicate characters */
if (!(status & DZ_DVAL))
goto ignore_char;
ch = UCHAR(status); /* grab the char */
flag = TTY_NORMAL;
while ((status = dz_in(dport_in, DZ_RBUF)) & DZ_DVAL) {
dport = &dz_ports[LINE(status)];
tty = dport->port.info->tty; /* point to the proper dev */
#if 0
if (info->is_console) {
if (ch == 0)
return; /* it's a break ... */
}
#endif
ch = UCHAR(status); /* grab the char */
tty = dport->port.info->tty;/* now tty points to the proper dev */
icount = &dport->port.icount;
if (!tty)
break;
icount->rx++;
/* keep track of the statistics */
if (status & (DZ_OERR | DZ_FERR | DZ_PERR)) {
if (status & DZ_PERR) /* parity error */
icount->parity++;
else if (status & DZ_FERR) /* frame error */
icount->frame++;
if (status & DZ_OERR) /* overrun error */
icount->overrun++;
/* check to see if we should ignore the character
and mask off conditions that should be ignored
flag = TTY_NORMAL;
if (status & DZ_FERR) { /* frame error */
/*
* There is no separate BREAK status bit, so
* treat framing errors as BREAKs for Magic SysRq
* and SAK; normally, otherwise.
*/
if (status & dport->port.ignore_status_mask) {
if (++ignore > 100)
break;
goto ignore_char;
}
/* mask off the error conditions we want to ignore */
tmp = status & dport->port.read_status_mask;
if (tmp & DZ_PERR) {
flag = TTY_PARITY;
#ifdef DEBUG_DZ
debug_console("PERR\n", 5);
#endif
} else if (tmp & DZ_FERR) {
if (uart_handle_break(&dport->port))
continue;
if (dport->port.flags & UPF_SAK)
flag = TTY_BREAK;
else
flag = TTY_FRAME;
#ifdef DEBUG_DZ
debug_console("FERR\n", 5);
#endif
}
if (tmp & DZ_OERR) {
#ifdef DEBUG_DZ
debug_console("OERR\n", 5);
#endif
tty_insert_flip_char(tty, ch, flag);
ch = 0;
flag = TTY_OVERRUN;
}
} else if (status & DZ_OERR) /* overrun error */
flag = TTY_OVERRUN;
else if (status & DZ_PERR) /* parity error */
flag = TTY_PARITY;
/* keep track of the statistics */
switch (flag) {
case TTY_FRAME:
icount->frame++;
break;
case TTY_PARITY:
icount->parity++;
break;
case TTY_OVERRUN:
icount->overrun++;
break;
case TTY_BREAK:
icount->brk++;
break;
default:
break;
}
tty_insert_flip_char(tty, ch, flag);
ignore_char:
;
} while (status & DZ_DVAL);
if (tty)
tty_flip_buffer_push(tty);
if (uart_handle_sysrq_char(&dport->port, ch, regs))
continue;
if ((status & dport->port.ignore_status_mask) == 0) {
uart_insert_char(&dport->port,
status, DZ_OERR, ch, flag);
lines_rx[LINE(status)] = 1;
}
}
for (i = 0; i < DZ_NB_PORT; i++)
if (lines_rx[i])
tty_flip_buffer_push(dz_ports[i].port.info->tty);
}
/*
......@@ -275,26 +247,32 @@ static inline void dz_receive_chars(struct dz_port *dport)
* This routine deals with outputs to any lines.
* ------------------------------------------------------------
*/
static inline void dz_transmit_chars(struct dz_port *dport)
static inline void dz_transmit_chars(struct dz_port *dport_in)
{
struct circ_buf *xmit = &dport->port.info->xmit;
struct dz_port *dport;
struct circ_buf *xmit;
unsigned short status;
unsigned char tmp;
if (dport->port.x_char) { /* XON/XOFF chars */
status = dz_in(dport_in, DZ_CSR);
dport = &dz_ports[LINE(status)];
xmit = &dport->port.info->xmit;
if (dport->port.x_char) { /* XON/XOFF chars */
dz_out(dport, DZ_TDR, dport->port.x_char);
dport->port.icount.tx++;
dport->port.x_char = 0;
return;
}
/* if nothing to do or stopped or hardware stopped */
/* If nothing to do or stopped or hardware stopped. */
if (uart_circ_empty(xmit) || uart_tx_stopped(&dport->port)) {
dz_stop_tx(&dport->port);
return;
}
/*
* if something to do ... (rember the dz has no output fifo so we go
* one char at a time :-<
* If something to do... (remember the dz has no output fifo,
* so we go one char at a time) :-<
*/
tmp = xmit->buf[xmit->tail];
xmit->tail = (xmit->tail + 1) & (DZ_XMIT_SIZE - 1);
......@@ -304,23 +282,29 @@ static inline void dz_transmit_chars(struct dz_port *dport)
if (uart_circ_chars_pending(xmit) < DZ_WAKEUP_CHARS)
uart_write_wakeup(&dport->port);
/* Are we done */
/* Are we are done. */
if (uart_circ_empty(xmit))
dz_stop_tx(&dport->port);
}
/*
* ------------------------------------------------------------
* check_modem_status ()
* check_modem_status()
*
* Only valid for the MODEM line duh !
* DS 3100 & 5100: Only valid for the MODEM line, duh!
* DS 5000/200: Valid for the MODEM and PRINTER line.
* ------------------------------------------------------------
*/
static inline void check_modem_status(struct dz_port *dport)
{
/*
* FIXME:
* 1. No status change interrupt; use a timer.
* 2. Handle the 3100/5000 as appropriate. --macro
*/
unsigned short status;
/* if not ne modem line just return */
/* If not the modem line just return. */
if (dport->port.line != DZ_MODEM)
return;
......@@ -341,21 +325,18 @@ static inline void check_modem_status(struct dz_port *dport)
*/
static irqreturn_t dz_interrupt(int irq, void *dev)
{
struct dz_port *dport;
struct dz_port *dport = (struct dz_port *)dev;
unsigned short status;
/* get the reason why we just got an irq */
status = dz_in((struct dz_port *)dev, DZ_CSR);
dport = &dz_ports[LINE(status)];
status = dz_in(dport, DZ_CSR);
if (status & DZ_RDONE)
dz_receive_chars(dport);
if ((status & (DZ_RDONE | DZ_RIE)) == (DZ_RDONE | DZ_RIE))
dz_receive_chars(dport, regs);
if (status & DZ_TRDY)
if ((status & (DZ_TRDY | DZ_TIE)) == (DZ_TRDY | DZ_TIE))
dz_transmit_chars(dport);
/* FIXME: what about check modem status??? --rmk */
return IRQ_HANDLED;
}
......@@ -367,13 +348,13 @@ static irqreturn_t dz_interrupt(int irq, void *dev)
static unsigned int dz_get_mctrl(struct uart_port *uport)
{
/*
* FIXME: Handle the 3100/5000 as appropriate. --macro
*/
struct dz_port *dport = (struct dz_port *)uport;
unsigned int mctrl = TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
if (dport->port.line == DZ_MODEM) {
/*
* CHECKME: This is a guess from the other code... --rmk
*/
if (dz_in(dport, DZ_MSR) & DZ_MODEM_DSR)
mctrl &= ~TIOCM_DSR;
}
......@@ -383,6 +364,9 @@ static unsigned int dz_get_mctrl(struct uart_port *uport)
static void dz_set_mctrl(struct uart_port *uport, unsigned int mctrl)
{
/*
* FIXME: Handle the 3100/5000 as appropriate. --macro
*/
struct dz_port *dport = (struct dz_port *)uport;
unsigned short tmp;
......@@ -409,13 +393,6 @@ static int dz_startup(struct uart_port *uport)
unsigned long flags;
unsigned short tmp;
/* The dz lines for the mouse/keyboard must be
* opened using their respective drivers.
*/
if ((dport->port.line == DZ_KEYBOARD) ||
(dport->port.line == DZ_MOUSE))
return -ENODEV;
spin_lock_irqsave(&dport->port.lock, flags);
/* enable the interrupt and the scanning */
......@@ -442,7 +419,8 @@ static void dz_shutdown(struct uart_port *uport)
}
/*
* get_lsr_info - get line status register info
* -------------------------------------------------------------------
* dz_tx_empty() -- get the transmitter empty status
*
* Purpose: Let user call ioctl() to get info when the UART physically
* is emptied. On bus types like RS485, the transmitter must
......@@ -450,21 +428,28 @@ static void dz_shutdown(struct uart_port *uport)
* the transmit shift register is empty, not be done when the
* transmit holding register is empty. This functionality
* allows an RS485 driver to be written in user space.
* -------------------------------------------------------------------
*/
static unsigned int dz_tx_empty(struct uart_port *uport)
{
struct dz_port *dport = (struct dz_port *)uport;
unsigned short status = dz_in(dport, DZ_LPR);
unsigned short tmp, mask = 1 << dport->port.line;
/* FIXME: this appears to be obviously broken --rmk. */
return status ? TIOCSER_TEMT : 0;
tmp = dz_in(dport, DZ_TCR);
tmp &= mask;
return tmp ? 0 : TIOCSER_TEMT;
}
static void dz_break_ctl(struct uart_port *uport, int break_state)
{
/*
* FIXME: Can't access BREAK bits in TDR easily;
* reuse the code for polled TX. --macro
*/
struct dz_port *dport = (struct dz_port *)uport;
unsigned long flags;
unsigned short tmp, mask = 1 << uport->line;
unsigned short tmp, mask = 1 << dport->port.line;
spin_lock_irqsave(&uport->lock, flags);
tmp = dz_in(dport, DZ_TCR);
......@@ -561,7 +546,7 @@ static void dz_set_termios(struct uart_port *uport, struct termios *termios,
spin_lock_irqsave(&dport->port.lock, flags);
dz_out(dport, DZ_LPR, cflag);
dz_out(dport, DZ_LPR, cflag | dport->port.line);
dport->cflag = cflag;
/* setup accept flag */
......@@ -650,7 +635,7 @@ static void __init dz_init_ports(void)
for (i = 0, dport = dz_ports; i < DZ_NB_PORT; i++, dport++) {
spin_lock_init(&dport->port.lock);
dport->port.membase = (char *) base;
dport->port.iotype = UPIO_PORT;
dport->port.iotype = UPIO_MEM;
dport->port.irq = dec_interrupt[DEC_IRQ_DZ11];
dport->port.line = i;
dport->port.fifosize = 1;
......@@ -662,10 +647,7 @@ static void __init dz_init_ports(void)
static void dz_reset(struct dz_port *dport)
{
dz_out(dport, DZ_CSR, DZ_CLR);
while (dz_in(dport, DZ_CSR) & DZ_CLR);
/* FIXME: cpu_relax? */
iob();
/* enable scanning */
......@@ -673,26 +655,55 @@ static void dz_reset(struct dz_port *dport)
}
#ifdef CONFIG_SERIAL_DZ_CONSOLE
/*
* -------------------------------------------------------------------
* dz_console_putchar() -- transmit a character
*
* Polled transmission. This is tricky. We need to mask transmit
* interrupts so that they do not interfere, enable the transmitter
* for the line requested and then wait till the transmit scanner
* requests data for this line. But it may request data for another
* line first, in which case we have to disable its transmitter and
* repeat waiting till our line pops up. Only then the character may
* be transmitted. Finally, the state of the transmitter mask is
* restored. Welcome to the world of PDP-11!
* -------------------------------------------------------------------
*/
static void dz_console_putchar(struct uart_port *uport, int ch)
{
struct dz_port *dport = (struct dz_port *)uport;
unsigned long flags;
int loops = 2500;
unsigned short tmp = (unsigned char)ch;
/* this code sends stuff out to serial device - spinning its
wheels and waiting. */
unsigned short csr, tcr, trdy, mask;
int loops = 10000;
spin_lock_irqsave(&dport->port.lock, flags);
csr = dz_in(dport, DZ_CSR);
dz_out(dport, DZ_CSR, csr & ~DZ_TIE);
tcr = dz_in(dport, DZ_TCR);
tcr |= 1 << dport->port.line;
mask = tcr;
dz_out(dport, DZ_TCR, mask);
iob();
spin_unlock_irqrestore(&dport->port.lock, flags);
/* spin our wheels */
while (((dz_in(dport, DZ_CSR) & DZ_TRDY) != DZ_TRDY) && loops--)
/* FIXME: cpu_relax, udelay? --rmk */
;
while (loops--) {
trdy = dz_in(dport, DZ_CSR);
if (!(trdy & DZ_TRDY))
continue;
trdy = (trdy & DZ_TLINE) >> 8;
if (trdy == dport->port.line)
break;
mask &= ~(1 << trdy);
dz_out(dport, DZ_TCR, mask);
iob();
udelay(2);
}
/* Actually transmit the character. */
dz_out(dport, DZ_TDR, tmp);
if (loops) /* Cannot send otherwise. */
dz_out(dport, DZ_TDR, ch);
spin_unlock_irqrestore(&dport->port.lock, flags);
dz_out(dport, DZ_TCR, tcr);
dz_out(dport, DZ_CSR, csr);
}
/*
......@@ -703,11 +714,11 @@ static void dz_console_putchar(struct uart_port *uport, int ch)
* The console must be locked when we get here.
* -------------------------------------------------------------------
*/
static void dz_console_print(struct console *cons,
static void dz_console_print(struct console *co,
const char *str,
unsigned int count)
{
struct dz_port *dport = &dz_ports[CONSOLE_LINE];
struct dz_port *dport = &dz_ports[co->index];
#ifdef DEBUG_DZ
prom_printf((char *) str);
#endif
......@@ -716,49 +727,43 @@ static void dz_console_print(struct console *cons,
static int __init dz_console_setup(struct console *co, char *options)
{
struct dz_port *dport = &dz_ports[CONSOLE_LINE];
struct dz_port *dport = &dz_ports[co->index];
int baud = 9600;
int bits = 8;
int parity = 'n';
int flow = 'n';
int ret;
unsigned short mask, tmp;
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
dz_reset(dport);
ret = uart_set_options(&dport->port, co, baud, parity, bits, flow);
if (ret == 0) {
mask = 1 << dport->port.line;
tmp = dz_in(dport, DZ_TCR); /* read the TX flag */
if (!(tmp & mask)) {
tmp |= mask; /* set the TX flag */
dz_out(dport, DZ_TCR, tmp);
}
}
return ret;
return uart_set_options(&dport->port, co, baud, parity, bits, flow);
}
static struct console dz_sercons =
{
static struct uart_driver dz_reg;
static struct console dz_sercons = {
.name = "ttyS",
.write = dz_console_print,
.device = uart_console_device,
.setup = dz_console_setup,
.flags = CON_CONSDEV | CON_PRINTBUFFER,
.index = CONSOLE_LINE,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &dz_reg,
};
void __init dz_serial_console_init(void)
static int __init dz_serial_console_init(void)
{
dz_init_ports();
register_console(&dz_sercons);
if (!IOASIC) {
dz_init_ports();
register_console(&dz_sercons);
return 0;
} else
return -ENXIO;
}
console_initcall(dz_serial_console_init);
#define SERIAL_DZ_CONSOLE &dz_sercons
#else
#define SERIAL_DZ_CONSOLE NULL
......@@ -767,35 +772,29 @@ void __init dz_serial_console_init(void)
static struct uart_driver dz_reg = {
.owner = THIS_MODULE,
.driver_name = "serial",
.dev_name = "ttyS%d",
.dev_name = "ttyS",
.major = TTY_MAJOR,
.minor = 64,
.nr = DZ_NB_PORT,
.cons = SERIAL_DZ_CONSOLE,
};
int __init dz_init(void)
static int __init dz_init(void)
{
unsigned long flags;
int ret, i;
if (IOASIC)
return -ENXIO;
printk("%s%s\n", dz_name, dz_version);
dz_init_ports();
save_flags(flags);
cli();
#ifndef CONFIG_SERIAL_DZ_CONSOLE
/* reset the chip */
dz_reset(&dz_ports[0]);
#endif
/* order matters here... the trick is that flags
is updated... in request_irq - to immediatedly obliterate
it is unwise. */
restore_flags(flags);
if (request_irq(dz_ports[0].port.irq, dz_interrupt,
IRQF_DISABLED, "DZ", &dz_ports[0]))
panic("Unable to register DZ interrupt");
......@@ -810,5 +809,7 @@ int __init dz_init(void)
return ret;
}
module_init(dz_init);
MODULE_DESCRIPTION("DECstation DZ serial driver");
MODULE_LICENSE("GPL");
drivers/serial/dz.h
View file @ 9399575d
/*
* dz.h: Serial port driver for DECStations equiped
* dz.h: Serial port driver for DECstations equipped
* with the DZ chipset.
*
* Copyright (C) 1998 Olivier A. D. Lebaillif
*
* Email: olivier.lebaillif@ifrsys.com
*
* Copyright (C) 2004, 2006 Maciej W. Rozycki
*/
#ifndef DZ_SERIAL_H
#define DZ_SERIAL_H
/*
* Definitions for the Control and Status Received.
* Definitions for the Control and Status Register.
*/
#define DZ_TRDY 0x8000 /* Transmitter empty */
#define DZ_TIE 0x4000 /* Transmitter Interrupt Enable */
#define DZ_TIE 0x4000 /* Transmitter Interrupt Enbl */
#define DZ_TLINE 0x0300 /* Transmitter Line Number */
#define DZ_RDONE 0x0080 /* Receiver data ready */
#define DZ_RIE 0x0040 /* Receive Interrupt Enable */
#define DZ_MSE 0x0020 /* Master Scan Enable */
......@@ -22,32 +24,44 @@
#define DZ_MAINT 0x0008 /* Loop Back Mode */
/*
* Definitions for the Received buffer.
* Definitions for the Receiver Buffer Register.
*/
#define DZ_RBUF_MASK 0x00FF /* Data Mask in the Receive Buffer */
#define DZ_LINE_MASK 0x0300 /* Line Mask in the Receive Buffer */
#define DZ_RBUF_MASK 0x00FF /* Data Mask */
#define DZ_LINE_MASK 0x0300 /* Line Mask */
#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)
#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.
* Definitions for the Transmit Control Register.
*/
#define DZ_LINE_KEYBOARD 0x0001
#define DZ_LINE_MOUSE 0x0002
#define DZ_LINE_MODEM 0x0004
#define DZ_LINE_PRINTER 0x0008
#define DZ_MODEM_RTS 0x0800 /* RTS for the modem line (2) */
#define DZ_MODEM_DTR 0x0400 /* DTR for the modem line (2) */
#define DZ_PRINT_RTS 0x0200 /* RTS for the prntr line (3) */
#define DZ_PRINT_DTR 0x0100 /* DTR for the prntr line (3) */
#define DZ_LNENB 0x000f /* Transmitter Line Enable */
/*
* Definitions for the Modem Status Register.
*/
#define DZ_MODEM_RI 0x0800 /* RI for the modem line (2) */
#define DZ_MODEM_CD 0x0400 /* CD for the modem line (2) */
#define DZ_MODEM_DSR 0x0200 /* DSR for the modem line (2) */
#define DZ_MODEM_CTS 0x0100 /* CTS for the modem line (2) */
#define DZ_PRINT_RI 0x0008 /* RI for the printer line (3) */
#define DZ_PRINT_CD 0x0004 /* CD for the printer line (3) */
#define DZ_PRINT_DSR 0x0002 /* DSR for the prntr line (3) */
#define DZ_PRINT_CTS 0x0001 /* CTS for the prntr line (3) */
/*
* Definitions for the Transmit Data Register.
......
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