static void a2232_shutdown_port(void *ptr)
{
struct a2232_port *port;
volatile struct a2232status *stat;
unsigned long flags;
port = ptr;
stat = a2232stat(port->which_a2232, port->which_port_on_a2232);
local_irq_save(flags);
port->gs.port.flags &= ~GS_ACTIVE;
if (port->gs.port.tty && port->gs.port.tty->termios->c_cflag & HUPCL) {
/* Set DTR and RTS to Low, flush output.
The NetBSD driver "msc.c" does it this way. */
stat->Command = ( (stat->Command & ~A2232CMD_CMask) |
A2232CMD_Close );
stat->OutFlush = -1;
stat->Setup = -1;
}
local_irq_restore(flags);
/* After analyzing control flow, I think a2232_shutdown_port
is actually the last call from the system when at application
level someone issues a "echo Hello >>/dev/ttyY0".
Therefore I think the MOD_DEC_USE_COUNT should be here and
not in "a2232_close()". See the comment in "sx.c", too.
If you run into problems, compile this driver into the
kernel instead of compiling it as a module. */
}
static int a2232_chars_in_buffer(void *ptr)
{
struct a2232_port *port;
volatile struct a2232status *status;
unsigned char ret; /* we need modulo-256 arithmetics */
port = ptr;
status = a2232stat(port->which_a2232, port->which_port_on_a2232);
#if A2232_IOBUFLEN != 256
#error "Re-Implement a2232_chars_in_buffer()!"
#endif
ret = (status->OutHead - status->OutTail);
return ret;
}
static void a2232_enable_tx_interrupts(void *ptr)
{
struct a2232_port *port;
volatile struct a2232status *stat;
unsigned long flags;
port = ptr;
stat = a2232stat(port->which_a2232, port->which_port_on_a2232);
stat->OutDisable = 0;
/* Does this here really have to be? */
local_irq_save(flags);
port->gs.port.flags |= GS_TX_INTEN;
local_irq_restore(flags);
}
static void a2232_disable_tx_interrupts(void *ptr)
{
struct a2232_port *port;
volatile struct a2232status *stat;
unsigned long flags;
port = ptr;
stat = a2232stat(port->which_a2232, port->which_port_on_a2232);
stat->OutDisable = -1;
/* Does this here really have to be? */
save_flags(flags);
cli();
port->gs.flags &= ~GS_TX_INTEN;
restore_flags(flags);
}
static irqreturn_t a2232_vbl_inter(int irq, void *data)
{
#if A2232_IOBUFLEN != 256
#error "Re-Implement a2232_vbl_inter()!"
#endif
struct a2232_port *port;
volatile struct a2232memory *mem;
volatile struct a2232status *status;
unsigned char newhead;
unsigned char bufpos; /* Must be unsigned char. We need the modulo-256 arithmetics */
unsigned char ncd, ocd, ccd; /* names consistent with the NetBSD driver */
volatile u_char *ibuf, *cbuf, *obuf;
int ch, err, n, p;
for (n = 0; n < nr_a2232; n++){ /* for every completely initialized A2232 board */
mem = a2232mem(n);
for (p = 0; p < NUMLINES; p++){ /* for every port on this board */
err = 0;
port = &a2232_ports[n*NUMLINES+p];
if ( port->gs.port.flags & GS_ACTIVE ){ /* if the port is used */
status = a2232stat(n,p);
if (!port->disable_rx && !port->throttle_input){ /* If input is not disabled */
newhead = status->InHead; /* 65EC02 write pointer */
bufpos = status->InTail;
/* check for input for this port */
if (newhead != bufpos) {
/* buffer for input chars/events */
ibuf = mem->InBuf[p];
/* data types of bytes in ibuf */
cbuf = mem->InCtl[p];
/* do for all chars */
while (bufpos != newhead) {
/* which type of input data? */
switch (cbuf[bufpos]) {
/* switch on input event (CD, BREAK, etc.) */
case A2232INCTL_EVENT:
switch (ibuf[bufpos++]) {
case A2232EVENT_Break:
/* TODO: Handle BREAK signal */
break;
/* A2232EVENT_CarrierOn and A2232EVENT_CarrierOff are
handled in a separate queue and should not occur here. */
case A2232EVENT_Sync:
printk("A2232: 65EC02 software sent SYNC event, don't know what to do. Ignoring.");
break;
default:
printk("A2232: 65EC02 software broken, unknown event type %d occurred.\n",ibuf[bufpos-1]);
} /* event type switch */
break;
case A2232INCTL_CHAR:
/* Receive incoming char */
a2232_receive_char(port, ibuf[bufpos], err);
bufpos++;
break;
default:
printk("A2232: 65EC02 software broken, unknown data type %d occurred.\n",cbuf[bufpos]);
bufpos++;
} /* switch on input data type */
} /* while there's something in the buffer */
status->InTail = bufpos; /* tell 65EC02 what we've read */
} /* if there was something in the buffer */
} /* If input is not disabled */
/* Now check if there's something to output */
obuf = mem->OutBuf[p];
bufpos = status->OutHead;
while ( (port->gs.xmit_cnt > 0) &&
(!port->gs.port.tty->stopped) &&
(!port->gs.port.tty->hw_stopped) ){ /* While there are chars to transmit */
if (((bufpos+1) & A2232_IOBUFLENMASK) != status->OutTail) { /* If the A2232 buffer is not full */
ch = port->gs.xmit_buf[port->gs.xmit_tail]; /* get the next char to transmit */
port->gs.xmit_tail = (port->gs.xmit_tail+1) & (SERIAL_XMIT_SIZE-1); /* modulo-addition for the gs.xmit_buf ring-buffer */
obuf[bufpos++] = ch; /* put it into the A2232 buffer */
port->gs.xmit_cnt--;
}
else{ /* If A2232 the buffer is full */
break; /* simply stop filling it. */
}
}
status->OutHead = bufpos;
/* WakeUp if output buffer runs low */
if ((port->gs.xmit_cnt <= port->gs.wakeup_chars) && port->gs.port.tty) {
tty_wakeup(port->gs.port.tty);
}
} // if the port is used
} // for every port on the board
/* Now check the CD message queue */
newhead = mem->Common.CDHead;
bufpos = mem->Common.CDTail;
if (newhead != bufpos){ /* There are CD events in queue */
ocd = mem->Common.CDStatus; /* get old status bits */
while (newhead != bufpos){ /* read all events */
ncd = mem->CDBuf[bufpos++]; /* get one event */
ccd = ncd ^ ocd; /* mask of changed lines */
ocd = ncd; /* save new status bits */
for(p=0; p < NUMLINES; p++){ /* for all ports */
if (ccd & 1){ /* this one changed */
struct a2232_port *port = &a2232_ports[n*7+p];
port->cd_status = !(ncd & 1); /* ncd&1 <=> CD is now off */
if (!(port->gs.port.flags & ASYNC_CHECK_CD))
; /* Don't report DCD changes */
else if (port->cd_status) { // if DCD on: DCD went UP!
/* Are we blocking in open?*/
wake_up_interruptible(&port->gs.port.open_wait);
}
else { // if DCD off: DCD went DOWN!
if (port->gs.port.tty)
tty_hangup (port->gs.port.tty);
}
} // if CD changed for this port
ccd >>= 1;
ncd >>= 1; /* Shift bits for next line */
} // for every port
} // while CD events in queue
mem->Common.CDStatus = ocd; /* save new status */
mem->Common.CDTail = bufpos; /* remove events */
} // if events in CD queue
} // for every completely initialized A2232 board
static int a2232_set_real_termios(void *ptr)
{
unsigned int cflag, baud, chsize, stopb, parity, softflow;
int rate;
int a2232_param, a2232_cmd;
unsigned long flags;
unsigned int i;
struct a2232_port *port = ptr;
volatile struct a2232status *status;
volatile struct a2232memory *mem;
if (!port->gs.port.tty || !port->gs.port.tty->termios) return 0;
status = a2232stat(port->which_a2232, port->which_port_on_a2232);
mem = a2232mem(port->which_a2232);
a2232_param = a2232_cmd = 0;
// get baud rate
baud = port->gs.baud;
if (baud == 0) {
/* speed == 0 -> drop DTR, do nothing else */
local_irq_save(flags);
// Clear DTR (and RTS... mhhh).
status->Command = ( (status->Command & ~A2232CMD_CMask) |
A2232CMD_Close );
status->OutFlush = -1;
status->Setup = -1;
local_irq_restore(flags);
return 0;
}
rate = A2232_BAUD_TABLE_NOAVAIL;
for (i=0; i < A2232_BAUD_TABLE_NUM_RATES * 3; i += 3){
if (a2232_baud_table[i] == baud){
if (mem->Common.Crystal == A2232_TURBO) rate = a2232_baud_table[i+2];
else rate = a2232_baud_table[i+1];
}
}
if (rate == A2232_BAUD_TABLE_NOAVAIL){
printk("a2232: Board %d Port %d unsupported baud rate: %d baud. Using another.\n",port->which_a2232,port->which_port_on_a2232,baud);
// This is useful for both (turbo or normal) Crystal versions.
rate = A2232PARAM_B9600;
}
a2232_param |= rate;
cflag = port->gs.port.tty->termios->c_cflag;
// get character size
chsize = cflag & CSIZE;
switch (chsize){
case CS8: a2232_param |= A2232PARAM_8Bit; break;
case CS7: a2232_param |= A2232PARAM_7Bit; break;
case CS6: a2232_param |= A2232PARAM_6Bit; break;
case CS5: a2232_param |= A2232PARAM_5Bit; break;
default: printk("a2232: Board %d Port %d unsupported character size: %d. Using 8 data bits.\n",
port->which_a2232,port->which_port_on_a2232,chsize);
a2232_param |= A2232PARAM_8Bit; break;
}
// get number of stop bits
stopb = cflag & CSTOPB;
if (stopb){ // two stop bits instead of one
printk("a2232: Board %d Port %d 2 stop bits unsupported. Using 1 stop bit.\n",
port->which_a2232,port->which_port_on_a2232);
}
// Warn if RTS/CTS not wanted
if (!(cflag & CRTSCTS)){
#ifndef A2232_SUPPRESS_RTSCTS_WARNING
printk("a2232: Board %d Port %d cannot switch off firmware-implemented RTS/CTS hardware flow control.\n",
port->which_a2232,port->which_port_on_a2232);
#endif
}
/* I think this is correct.
However, IXOFF means _input_ flow control and I wonder
if one should care about IXON _output_ flow control,
too. If this makes problems, one should turn the A2232
firmware XON/XOFF "SoftFlow" flow control off and use
the conventional way of inserting START/STOP characters
by hand in throttle()/unthrottle().
*/
softflow = !!( port->gs.port.tty->termios->c_iflag & IXOFF );
// get Parity (Enabled/Disabled? If Enabled, Odd or Even?)
parity = cflag & (PARENB | PARODD);
if (parity & PARENB){
if (parity & PARODD){
a2232_cmd |= A2232CMD_OddParity;
}
else{
a2232_cmd |= A2232CMD_EvenParity;
}
}
else a2232_cmd |= A2232CMD_NoParity;
/* Hmm. Maybe an own a2232_port structure
member would be cleaner? */
if (cflag & CLOCAL)
port->gs.port.flags &= ~ASYNC_CHECK_CD;
else
port->gs.port.flags |= ASYNC_CHECK_CD;
/* Now we have all parameters and can go to set them: */
local_irq_save(flags);
status->Param = a2232_param | A2232PARAM_RcvBaud;
status->Command = a2232_cmd | A2232CMD_Open | A2232CMD_Enable;
status->SoftFlow = softflow;
status->OutDisable = 0;
status->Setup = -1;
local_irq_restore(flags);
return 0;
}
