- /* validate the port number (as configured and open) */
- if( (channel < 0) || (NR_PORTS <= channel) ){
- base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
- base_addr[CyTEOIR] = CyNOTRANS;
- return IRQ_HANDLED;
- }
- info->last_active = jiffies;
- if(info->tty == 0){
- base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
- if (info->xmit_cnt < WAKEUP_CHARS) {
- cy_sched_event(info, Cy_EVENT_WRITE_WAKEUP);
- }
- base_addr[CyTEOIR] = CyNOTRANS;
- return IRQ_HANDLED;
- }
-
- /* load the on-chip space available for outbound data */
- saved_cnt = char_count = base_addr[CyTFTC];
-
- if(info->x_char) { /* send special char */
- outch = info->x_char;
- base_addr[CyTDR] = outch;
- char_count--;
- info->x_char = 0;
- }
-
- if (info->x_break){
- /* The Cirrus chip requires the "Embedded Transmit
- Commands" of start break, delay, and end break
- sequences to be sent. The duration of the
- break is given in TICs, which runs at HZ
- (typically 100) and the PPR runs at 200 Hz,
- so the delay is duration * 200/HZ, and thus a
- break can run from 1/100 sec to about 5/4 sec.
- Need to check these values - RGH 141095.
- */
- base_addr[CyTDR] = 0; /* start break */
- base_addr[CyTDR] = 0x81;
- base_addr[CyTDR] = 0; /* delay a bit */
- base_addr[CyTDR] = 0x82;
- base_addr[CyTDR] = info->x_break*200/HZ;
- base_addr[CyTDR] = 0; /* terminate break */
- base_addr[CyTDR] = 0x83;
- char_count -= 7;
- info->x_break = 0;
- }
-
- while (char_count > 0){
- if (!info->xmit_cnt){
- base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
- break;
- }
- if (info->xmit_buf == 0){
- base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
- break;
- }
- if (info->tty->stopped || info->tty->hw_stopped){
- base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
- break;
- }
- /* Because the Embedded Transmit Commands have been
- enabled, we must check to see if the escape
- character, NULL, is being sent. If it is, we
- must ensure that there is room for it to be
- doubled in the output stream. Therefore we
- no longer advance the pointer when the character
- is fetched, but rather wait until after the check
- for a NULL output character. (This is necessary
- because there may not be room for the two chars
- needed to send a NULL.
- */
- outch = info->xmit_buf[info->xmit_tail];
- if( outch ){
- info->xmit_cnt--;
- info->xmit_tail = (info->xmit_tail + 1)
- & (PAGE_SIZE - 1);
- base_addr[CyTDR] = outch;
- char_count--;
- }else{
- if(char_count > 1){
- info->xmit_cnt--;
- info->xmit_tail = (info->xmit_tail + 1)
- & (PAGE_SIZE - 1);
+ /* validate the port number (as configured and open) */
+ if ((channel < 0) || (NR_PORTS <= channel)) {
+ base_addr[CyIER] &= ~(CyTxMpty | CyTxRdy);
+ base_addr[CyTEOIR] = CyNOTRANS;
+ return IRQ_HANDLED;
+ }
+ info->last_active = jiffies;
+ if (info->tty == 0) {
+ base_addr[CyIER] &= ~(CyTxMpty | CyTxRdy);
+ if (info->xmit_cnt < WAKEUP_CHARS) {
+ cy_sched_event(info, Cy_EVENT_WRITE_WAKEUP);
+ }
+ base_addr[CyTEOIR] = CyNOTRANS;
+ return IRQ_HANDLED;
+ }
+
+ /* load the on-chip space available for outbound data */
+ saved_cnt = char_count = base_addr[CyTFTC];
+
+ if (info->x_char) { /* send special char */
+ outch = info->x_char;