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ibchip/ns16550: Minor optimisation.

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This commit is contained in:
Chris Johns
2016-04-20 17:12:07 +10:00
parent 03ad2a5a92
commit 8ce75671eb
1 changed files with 14 additions and 13 deletions
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27
c/src/libchip/serial/ns16550.c
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@@ -1,6 +1,6 @@
/**
* @file
*
*
* This file contains the TTY driver for the National Semiconductor NS16550.
*
* This part is widely cloned and second sourced. It is found in a number
@@ -234,7 +234,7 @@ void ns16550_init(int minor)
Console_Port_Data[minor].pDeviceContext=(void *)pns16550Context;
pns16550Context->ucModemCtrl=SP_MODEM_IRQ;
pNS16550 = c->ulCtrlPort1;
pNS16550 = c->ulCtrlPort1;
setReg = c->setRegister;
getReg = c->getRegister;
@@ -389,7 +389,7 @@ void ns16550_outch_polled(console_tbl *c, char out)
void ns16550_write_polled(int minor, char out)
{
console_tbl *c = Console_Port_Tbl [minor];
ns16550_outch_polled( c, out );
}
@@ -616,27 +616,28 @@ NS16550_STATIC void ns16550_process( int minor)
NS16550Context *ctx = d->pDeviceContext;
uint32_t port = c->ulCtrlPort1;
getRegister_f get = c->getRegister;
int i = 0;
int i;
char buf [SP_FIFO_SIZE];
/* Iterate until no more interrupts are pending */
do {
/* Fetch received characters */
for (i = 0; i < SP_FIFO_SIZE; ++i) {
if ((get( port, NS16550_LINE_STATUS) & SP_LSR_RDY) != 0) {
buf [i] = (char) get(port, NS16550_RECEIVE_BUFFER);
} else {
break;
i = 0;
while ((get(port, NS16550_LINE_STATUS) & SP_LSR_RDY) != 0) {
buf[i++] = (char) get(port, NS16550_RECEIVE_BUFFER);
if (i == SP_FIFO_SIZE) {
/* Enqueue fetched characters */
rtems_termios_enqueue_raw_characters( d->termios_data, buf, i);
i = 0;
}
}
/* Enqueue fetched characters */
rtems_termios_enqueue_raw_characters( d->termios_data, buf, i);
if (i > 0)
rtems_termios_enqueue_raw_characters( d->termios_data, buf, i);
/* Check if we can dequeue transmitted characters */
if (ctx->transmitFifoChars > 0
&& (get( port, NS16550_LINE_STATUS) & SP_LSR_THOLD) != 0) {
/* Dequeue transmitted characters */
rtems_termios_dequeue_characters(
d->termios_data,
@@ -869,6 +870,6 @@ int ns16550_inch_polled(
int ns16550_inbyte_nonblocking_polled(int minor)
{
console_tbl *c = Console_Port_Tbl [minor];
return ns16550_inch_polled( c );
}