2 * Copyright 2003 Digi International (www.digi.com)
3 * Scott H Kilau <Scott_Kilau at digi dot com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2, or (at your option)
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
12 * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
13 * PURPOSE. See the GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 * NOTE TO LINUX KERNEL HACKERS: DO NOT REFORMAT THIS CODE!
22 * This is shared code between Digi's CVS archive and the
23 * Linux Kernel sources.
24 * Changing the source just for reformatting needlessly breaks
25 * our CVS diff history.
27 * Send any bug fixes/changes to: Eng.Linux at digi dot com.
32 #include <linux/kernel.h>
33 #include <linux/sched.h> /* For jiffies, task states */
34 #include <linux/interrupt.h> /* For tasklet and interrupt structs/defines */
35 #include <linux/delay.h> /* For udelay */
36 #include <linux/io.h> /* For read[bwl]/write[bwl] */
37 #include <linux/serial.h> /* For struct async_serial */
38 #include <linux/serial_reg.h> /* For the various UART offsets */
39 #include <linux/pci.h>
41 #include "dgnc_driver.h" /* Driver main header file */
44 #include "dgnc_trace.h"
46 static inline void cls_parse_isr(struct dgnc_board *brd, uint port);
47 static inline void cls_clear_break(struct channel_t *ch, int force);
48 static inline void cls_set_cts_flow_control(struct channel_t *ch);
49 static inline void cls_set_rts_flow_control(struct channel_t *ch);
50 static inline void cls_set_ixon_flow_control(struct channel_t *ch);
51 static inline void cls_set_ixoff_flow_control(struct channel_t *ch);
52 static inline void cls_set_no_output_flow_control(struct channel_t *ch);
53 static inline void cls_set_no_input_flow_control(struct channel_t *ch);
54 static void cls_parse_modem(struct channel_t *ch, uchar signals);
55 static void cls_tasklet(unsigned long data);
56 static void cls_vpd(struct dgnc_board *brd);
57 static void cls_uart_init(struct channel_t *ch);
58 static void cls_uart_off(struct channel_t *ch);
59 static int cls_drain(struct tty_struct *tty, uint seconds);
60 static void cls_param(struct tty_struct *tty);
61 static void cls_assert_modem_signals(struct channel_t *ch);
62 static void cls_flush_uart_write(struct channel_t *ch);
63 static void cls_flush_uart_read(struct channel_t *ch);
64 static void cls_disable_receiver(struct channel_t *ch);
65 static void cls_enable_receiver(struct channel_t *ch);
66 static void cls_send_break(struct channel_t *ch, int msecs);
67 static void cls_send_start_character(struct channel_t *ch);
68 static void cls_send_stop_character(struct channel_t *ch);
69 static void cls_copy_data_from_uart_to_queue(struct channel_t *ch);
70 static void cls_copy_data_from_queue_to_uart(struct channel_t *ch);
71 static uint cls_get_uart_bytes_left(struct channel_t *ch);
72 static void cls_send_immediate_char(struct channel_t *ch, unsigned char);
73 static irqreturn_t cls_intr(int irq, void *voidbrd);
75 struct board_ops dgnc_cls_ops = {
76 .tasklet = cls_tasklet,
78 .uart_init = cls_uart_init,
79 .uart_off = cls_uart_off,
83 .assert_modem_signals = cls_assert_modem_signals,
84 .flush_uart_write = cls_flush_uart_write,
85 .flush_uart_read = cls_flush_uart_read,
86 .disable_receiver = cls_disable_receiver,
87 .enable_receiver = cls_enable_receiver,
88 .send_break = cls_send_break,
89 .send_start_character = cls_send_start_character,
90 .send_stop_character = cls_send_stop_character,
91 .copy_data_from_queue_to_uart = cls_copy_data_from_queue_to_uart,
92 .get_uart_bytes_left = cls_get_uart_bytes_left,
93 .send_immediate_char = cls_send_immediate_char
97 static inline void cls_set_cts_flow_control(struct channel_t *ch)
99 uchar lcrb = readb(&ch->ch_cls_uart->lcr);
100 uchar ier = readb(&ch->ch_cls_uart->ier);
103 DPR_PARAM(("Setting CTSFLOW\n"));
106 * The Enhanced Register Set may only be accessed when
107 * the Line Control Register is set to 0xBFh.
109 writeb(UART_EXAR654_ENHANCED_REGISTER_SET, &ch->ch_cls_uart->lcr);
111 isr_fcr = readb(&ch->ch_cls_uart->isr_fcr);
113 /* Turn on CTS flow control, turn off IXON flow control */
114 isr_fcr |= (UART_EXAR654_EFR_ECB | UART_EXAR654_EFR_CTSDSR);
115 isr_fcr &= ~(UART_EXAR654_EFR_IXON);
117 writeb(isr_fcr, &ch->ch_cls_uart->isr_fcr);
119 /* Write old LCR value back out, which turns enhanced access off */
120 writeb(lcrb, &ch->ch_cls_uart->lcr);
123 * Enable interrupts for CTS flow, turn off interrupts for
124 * received XOFF chars
126 ier |= (UART_EXAR654_IER_CTSDSR);
127 ier &= ~(UART_EXAR654_IER_XOFF);
128 writeb(ier, &ch->ch_cls_uart->ier);
130 /* Set the usual FIFO values */
131 writeb((UART_FCR_ENABLE_FIFO), &ch->ch_cls_uart->isr_fcr);
133 writeb((UART_FCR_ENABLE_FIFO | UART_16654_FCR_RXTRIGGER_56 |
134 UART_16654_FCR_TXTRIGGER_16 | UART_FCR_CLEAR_RCVR),
135 &ch->ch_cls_uart->isr_fcr);
137 ch->ch_t_tlevel = 16;
142 static inline void cls_set_ixon_flow_control(struct channel_t *ch)
144 uchar lcrb = readb(&ch->ch_cls_uart->lcr);
145 uchar ier = readb(&ch->ch_cls_uart->ier);
148 DPR_PARAM(("Setting IXON FLOW\n"));
151 * The Enhanced Register Set may only be accessed when
152 * the Line Control Register is set to 0xBFh.
154 writeb(UART_EXAR654_ENHANCED_REGISTER_SET, &ch->ch_cls_uart->lcr);
156 isr_fcr = readb(&ch->ch_cls_uart->isr_fcr);
158 /* Turn on IXON flow control, turn off CTS flow control */
159 isr_fcr |= (UART_EXAR654_EFR_ECB | UART_EXAR654_EFR_IXON);
160 isr_fcr &= ~(UART_EXAR654_EFR_CTSDSR);
162 writeb(isr_fcr, &ch->ch_cls_uart->isr_fcr);
164 /* Now set our current start/stop chars while in enhanced mode */
165 writeb(ch->ch_startc, &ch->ch_cls_uart->mcr);
166 writeb(0, &ch->ch_cls_uart->lsr);
167 writeb(ch->ch_stopc, &ch->ch_cls_uart->msr);
168 writeb(0, &ch->ch_cls_uart->spr);
170 /* Write old LCR value back out, which turns enhanced access off */
171 writeb(lcrb, &ch->ch_cls_uart->lcr);
174 * Disable interrupts for CTS flow, turn on interrupts for
175 * received XOFF chars
177 ier &= ~(UART_EXAR654_IER_CTSDSR);
178 ier |= (UART_EXAR654_IER_XOFF);
179 writeb(ier, &ch->ch_cls_uart->ier);
181 /* Set the usual FIFO values */
182 writeb((UART_FCR_ENABLE_FIFO), &ch->ch_cls_uart->isr_fcr);
184 writeb((UART_FCR_ENABLE_FIFO | UART_16654_FCR_RXTRIGGER_16 |
185 UART_16654_FCR_TXTRIGGER_16 | UART_FCR_CLEAR_RCVR),
186 &ch->ch_cls_uart->isr_fcr);
191 static inline void cls_set_no_output_flow_control(struct channel_t *ch)
193 uchar lcrb = readb(&ch->ch_cls_uart->lcr);
194 uchar ier = readb(&ch->ch_cls_uart->ier);
197 DPR_PARAM(("Unsetting Output FLOW\n"));
200 * The Enhanced Register Set may only be accessed when
201 * the Line Control Register is set to 0xBFh.
203 writeb(UART_EXAR654_ENHANCED_REGISTER_SET, &ch->ch_cls_uart->lcr);
205 isr_fcr = readb(&ch->ch_cls_uart->isr_fcr);
207 /* Turn off IXON flow control, turn off CTS flow control */
208 isr_fcr |= (UART_EXAR654_EFR_ECB);
209 isr_fcr &= ~(UART_EXAR654_EFR_CTSDSR | UART_EXAR654_EFR_IXON);
211 writeb(isr_fcr, &ch->ch_cls_uart->isr_fcr);
213 /* Write old LCR value back out, which turns enhanced access off */
214 writeb(lcrb, &ch->ch_cls_uart->lcr);
217 * Disable interrupts for CTS flow, turn off interrupts for
218 * received XOFF chars
220 ier &= ~(UART_EXAR654_IER_CTSDSR);
221 ier &= ~(UART_EXAR654_IER_XOFF);
222 writeb(ier, &ch->ch_cls_uart->ier);
224 /* Set the usual FIFO values */
225 writeb((UART_FCR_ENABLE_FIFO), &ch->ch_cls_uart->isr_fcr);
227 writeb((UART_FCR_ENABLE_FIFO | UART_16654_FCR_RXTRIGGER_16 |
228 UART_16654_FCR_TXTRIGGER_16 | UART_FCR_CLEAR_RCVR),
229 &ch->ch_cls_uart->isr_fcr);
231 ch->ch_r_watermark = 0;
232 ch->ch_t_tlevel = 16;
233 ch->ch_r_tlevel = 16;
238 static inline void cls_set_rts_flow_control(struct channel_t *ch)
240 uchar lcrb = readb(&ch->ch_cls_uart->lcr);
241 uchar ier = readb(&ch->ch_cls_uart->ier);
244 DPR_PARAM(("Setting RTSFLOW\n"));
247 * The Enhanced Register Set may only be accessed when
248 * the Line Control Register is set to 0xBFh.
250 writeb(UART_EXAR654_ENHANCED_REGISTER_SET, &ch->ch_cls_uart->lcr);
252 isr_fcr = readb(&ch->ch_cls_uart->isr_fcr);
254 /* Turn on RTS flow control, turn off IXOFF flow control */
255 isr_fcr |= (UART_EXAR654_EFR_ECB | UART_EXAR654_EFR_RTSDTR);
256 isr_fcr &= ~(UART_EXAR654_EFR_IXOFF);
258 writeb(isr_fcr, &ch->ch_cls_uart->isr_fcr);
260 /* Write old LCR value back out, which turns enhanced access off */
261 writeb(lcrb, &ch->ch_cls_uart->lcr);
263 /* Enable interrupts for RTS flow */
264 ier |= (UART_EXAR654_IER_RTSDTR);
265 writeb(ier, &ch->ch_cls_uart->ier);
267 /* Set the usual FIFO values */
268 writeb((UART_FCR_ENABLE_FIFO), &ch->ch_cls_uart->isr_fcr);
270 writeb((UART_FCR_ENABLE_FIFO | UART_16654_FCR_RXTRIGGER_56 |
271 UART_16654_FCR_TXTRIGGER_16 | UART_FCR_CLEAR_RCVR),
272 &ch->ch_cls_uart->isr_fcr);
275 ch->ch_r_watermark = 4;
281 static inline void cls_set_ixoff_flow_control(struct channel_t *ch)
283 uchar lcrb = readb(&ch->ch_cls_uart->lcr);
284 uchar ier = readb(&ch->ch_cls_uart->ier);
287 DPR_PARAM(("Setting IXOFF FLOW\n"));
290 * The Enhanced Register Set may only be accessed when
291 * the Line Control Register is set to 0xBFh.
293 writeb(UART_EXAR654_ENHANCED_REGISTER_SET, &ch->ch_cls_uart->lcr);
295 isr_fcr = readb(&ch->ch_cls_uart->isr_fcr);
297 /* Turn on IXOFF flow control, turn off RTS flow control */
298 isr_fcr |= (UART_EXAR654_EFR_ECB | UART_EXAR654_EFR_IXOFF);
299 isr_fcr &= ~(UART_EXAR654_EFR_RTSDTR);
301 writeb(isr_fcr, &ch->ch_cls_uart->isr_fcr);
303 /* Now set our current start/stop chars while in enhanced mode */
304 writeb(ch->ch_startc, &ch->ch_cls_uart->mcr);
305 writeb(0, &ch->ch_cls_uart->lsr);
306 writeb(ch->ch_stopc, &ch->ch_cls_uart->msr);
307 writeb(0, &ch->ch_cls_uart->spr);
309 /* Write old LCR value back out, which turns enhanced access off */
310 writeb(lcrb, &ch->ch_cls_uart->lcr);
312 /* Disable interrupts for RTS flow */
313 ier &= ~(UART_EXAR654_IER_RTSDTR);
314 writeb(ier, &ch->ch_cls_uart->ier);
316 /* Set the usual FIFO values */
317 writeb((UART_FCR_ENABLE_FIFO), &ch->ch_cls_uart->isr_fcr);
319 writeb((UART_FCR_ENABLE_FIFO | UART_16654_FCR_RXTRIGGER_16 |
320 UART_16654_FCR_TXTRIGGER_16 | UART_FCR_CLEAR_RCVR),
321 &ch->ch_cls_uart->isr_fcr);
326 static inline void cls_set_no_input_flow_control(struct channel_t *ch)
328 uchar lcrb = readb(&ch->ch_cls_uart->lcr);
329 uchar ier = readb(&ch->ch_cls_uart->ier);
332 DPR_PARAM(("Unsetting Input FLOW\n"));
335 * The Enhanced Register Set may only be accessed when
336 * the Line Control Register is set to 0xBFh.
338 writeb(UART_EXAR654_ENHANCED_REGISTER_SET, &ch->ch_cls_uart->lcr);
340 isr_fcr = readb(&ch->ch_cls_uart->isr_fcr);
342 /* Turn off IXOFF flow control, turn off RTS flow control */
343 isr_fcr |= (UART_EXAR654_EFR_ECB);
344 isr_fcr &= ~(UART_EXAR654_EFR_RTSDTR | UART_EXAR654_EFR_IXOFF);
346 writeb(isr_fcr, &ch->ch_cls_uart->isr_fcr);
348 /* Write old LCR value back out, which turns enhanced access off */
349 writeb(lcrb, &ch->ch_cls_uart->lcr);
351 /* Disable interrupts for RTS flow */
352 ier &= ~(UART_EXAR654_IER_RTSDTR);
353 writeb(ier, &ch->ch_cls_uart->ier);
355 /* Set the usual FIFO values */
356 writeb((UART_FCR_ENABLE_FIFO), &ch->ch_cls_uart->isr_fcr);
358 writeb((UART_FCR_ENABLE_FIFO | UART_16654_FCR_RXTRIGGER_16 |
359 UART_16654_FCR_TXTRIGGER_16 | UART_FCR_CLEAR_RCVR),
360 &ch->ch_cls_uart->isr_fcr);
362 ch->ch_t_tlevel = 16;
363 ch->ch_r_tlevel = 16;
370 * Determines whether its time to shut off break condition.
372 * No locks are assumed to be held when calling this function.
373 * channel lock is held and released in this function.
375 static inline void cls_clear_break(struct channel_t *ch, int force)
379 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
382 DGNC_LOCK(ch->ch_lock, lock_flags);
384 /* Bail if we aren't currently sending a break. */
385 if (!ch->ch_stop_sending_break) {
386 DGNC_UNLOCK(ch->ch_lock, lock_flags);
390 /* Turn break off, and unset some variables */
391 if (ch->ch_flags & CH_BREAK_SENDING) {
392 if (time_after(jiffies, ch->ch_stop_sending_break) || force) {
393 uchar temp = readb(&ch->ch_cls_uart->lcr);
394 writeb((temp & ~UART_LCR_SBC), &ch->ch_cls_uart->lcr);
395 ch->ch_flags &= ~(CH_BREAK_SENDING);
396 ch->ch_stop_sending_break = 0;
397 DPR_IOCTL(("Finishing UART_LCR_SBC! finished: %lx\n",
401 DGNC_UNLOCK(ch->ch_lock, lock_flags);
405 /* Parse the ISR register for the specific port */
406 static inline void cls_parse_isr(struct dgnc_board *brd, uint port)
408 struct channel_t *ch;
413 * No need to verify board pointer, it was already
414 * verified in the interrupt routine.
417 if (port > brd->nasync)
420 ch = brd->channels[port];
421 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
424 /* Here we try to figure out what caused the interrupt to happen */
427 isr = readb(&ch->ch_cls_uart->isr_fcr);
429 /* Bail if no pending interrupt on port */
430 if (isr & UART_IIR_NO_INT)
433 DPR_INTR(("%s:%d port: %x isr: %x\n", __FILE__, __LINE__,
436 /* Receive Interrupt pending */
437 if (isr & (UART_IIR_RDI | UART_IIR_RDI_TIMEOUT)) {
438 /* Read data from uart -> queue */
441 cls_copy_data_from_uart_to_queue(ch);
442 dgnc_check_queue_flow_control(ch);
445 /* Transmit Hold register empty pending */
446 if (isr & UART_IIR_THRI) {
447 /* Transfer data (if any) from Write Queue -> UART. */
448 DGNC_LOCK(ch->ch_lock, lock_flags);
449 ch->ch_flags |= (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM);
452 DGNC_UNLOCK(ch->ch_lock, lock_flags);
453 cls_copy_data_from_queue_to_uart(ch);
456 /* CTS/RTS change of state */
457 if (isr & UART_IIR_CTSRTS) {
461 * Don't need to do anything, the cls_parse_modem
462 * below will grab the updated modem signals.
466 /* Parse any modem signal changes */
467 DPR_INTR(("MOD_STAT: sending to parse_modem_sigs\n"));
468 cls_parse_modem(ch, readb(&ch->ch_cls_uart->msr));
475 * Send any/all changes to the line to the UART.
477 static void cls_param(struct tty_struct *tty)
485 struct dgnc_board *bd;
486 struct channel_t *ch;
489 if (!tty || tty->magic != TTY_MAGIC)
492 un = (struct un_t *) tty->driver_data;
493 if (!un || un->magic != DGNC_UNIT_MAGIC)
497 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
501 if (!bd || bd->magic != DGNC_BOARD_MAGIC)
504 DPR_PARAM(("param start: tdev: %x cflags: %x oflags: %x iflags: %x\n",
505 ch->ch_tun.un_dev, ch->ch_c_cflag, ch->ch_c_oflag,
509 * If baud rate is zero, flush queues, and set mval to drop DTR.
511 if ((ch->ch_c_cflag & (CBAUD)) == 0) {
512 ch->ch_r_head = ch->ch_r_tail = 0;
513 ch->ch_e_head = ch->ch_e_tail = 0;
514 ch->ch_w_head = ch->ch_w_tail = 0;
516 cls_flush_uart_write(ch);
517 cls_flush_uart_read(ch);
519 /* The baudrate is B0 so all modem lines are to be dropped. */
520 ch->ch_flags |= (CH_BAUD0);
521 ch->ch_mostat &= ~(UART_MCR_RTS | UART_MCR_DTR);
522 cls_assert_modem_signals(ch);
525 } else if (ch->ch_custom_speed) {
527 baud = ch->ch_custom_speed;
528 /* Handle transition from B0 */
529 if (ch->ch_flags & CH_BAUD0) {
530 ch->ch_flags &= ~(CH_BAUD0);
533 * Bring back up RTS and DTR...
534 * Also handle RTS or DTR toggle if set.
536 if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE))
537 ch->ch_mostat |= (UART_MCR_RTS);
538 if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE))
539 ch->ch_mostat |= (UART_MCR_DTR);
546 ulong bauds[4][16] = {
550 600, 1200, 1800, 2400,
551 4800, 9600, 19200, 38400 },
552 { /* slowbaud & CBAUDEX */
553 0, 57600, 115200, 230400,
554 460800, 150, 200, 921600,
555 600, 1200, 1800, 2400,
556 4800, 9600, 19200, 38400 },
558 0, 57600, 76800, 115200,
559 131657, 153600, 230400, 460800,
560 921600, 1200, 1800, 2400,
561 4800, 9600, 19200, 38400 },
562 { /* fastbaud & CBAUDEX */
563 0, 57600, 115200, 230400,
564 460800, 150, 200, 921600,
565 600, 1200, 1800, 2400,
566 4800, 9600, 19200, 38400 }
570 * Only use the TXPrint baud rate if the terminal
573 if (!(ch->ch_tun.un_flags & UN_ISOPEN) &&
574 (un->un_type == DGNC_PRINT))
575 baud = C_BAUD(ch->ch_pun.un_tty) & 0xff;
577 baud = C_BAUD(ch->ch_tun.un_tty) & 0xff;
579 if (ch->ch_c_cflag & CBAUDEX)
582 if (ch->ch_digi.digi_flags & DIGI_FAST)
587 if ((iindex >= 0) && (iindex < 4) && (jindex >= 0) &&
589 baud = bauds[iindex][jindex];
591 DPR_IOCTL(("baud indices were out of range (%d)(%d)",
599 /* Handle transition from B0 */
600 if (ch->ch_flags & CH_BAUD0) {
601 ch->ch_flags &= ~(CH_BAUD0);
604 * Bring back up RTS and DTR...
605 * Also handle RTS or DTR toggle if set.
607 if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE))
608 ch->ch_mostat |= (UART_MCR_RTS);
609 if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE))
610 ch->ch_mostat |= (UART_MCR_DTR);
614 if (ch->ch_c_cflag & PARENB)
615 lcr |= UART_LCR_PARITY;
617 if (!(ch->ch_c_cflag & PARODD))
618 lcr |= UART_LCR_EPAR;
621 * Not all platforms support mark/space parity,
622 * so this will hide behind an ifdef.
625 if (ch->ch_c_cflag & CMSPAR)
626 lcr |= UART_LCR_SPAR;
629 if (ch->ch_c_cflag & CSTOPB)
630 lcr |= UART_LCR_STOP;
632 switch (ch->ch_c_cflag & CSIZE) {
634 lcr |= UART_LCR_WLEN5;
637 lcr |= UART_LCR_WLEN6;
640 lcr |= UART_LCR_WLEN7;
644 lcr |= UART_LCR_WLEN8;
648 ier = uart_ier = readb(&ch->ch_cls_uart->ier);
649 uart_lcr = readb(&ch->ch_cls_uart->lcr);
654 quot = ch->ch_bd->bd_dividend / baud;
656 if (quot != 0 && ch->ch_old_baud != baud) {
657 ch->ch_old_baud = baud;
658 writeb(UART_LCR_DLAB, &ch->ch_cls_uart->lcr);
659 writeb((quot & 0xff), &ch->ch_cls_uart->txrx);
660 writeb((quot >> 8), &ch->ch_cls_uart->ier);
661 writeb(lcr, &ch->ch_cls_uart->lcr);
665 writeb(lcr, &ch->ch_cls_uart->lcr);
667 if (ch->ch_c_cflag & CREAD)
668 ier |= (UART_IER_RDI | UART_IER_RLSI);
670 ier &= ~(UART_IER_RDI | UART_IER_RLSI);
673 * Have the UART interrupt on modem signal changes ONLY when
674 * we are in hardware flow control mode, or CLOCAL/FORCEDCD is not set.
676 if ((ch->ch_digi.digi_flags & CTSPACE) ||
677 (ch->ch_digi.digi_flags & RTSPACE) ||
678 (ch->ch_c_cflag & CRTSCTS) ||
679 !(ch->ch_digi.digi_flags & DIGI_FORCEDCD) ||
680 !(ch->ch_c_cflag & CLOCAL))
683 ier &= ~UART_IER_MSI;
685 ier |= UART_IER_THRI;
688 writeb(ier, &ch->ch_cls_uart->ier);
690 if (ch->ch_digi.digi_flags & CTSPACE || ch->ch_c_cflag & CRTSCTS) {
691 cls_set_cts_flow_control(ch);
692 } else if (ch->ch_c_iflag & IXON) {
694 * If start/stop is set to disable, then we should
695 * disable flow control
697 if ((ch->ch_startc == _POSIX_VDISABLE) ||
698 (ch->ch_stopc == _POSIX_VDISABLE))
699 cls_set_no_output_flow_control(ch);
701 cls_set_ixon_flow_control(ch);
703 cls_set_no_output_flow_control(ch);
706 if (ch->ch_digi.digi_flags & RTSPACE || ch->ch_c_cflag & CRTSCTS) {
707 cls_set_rts_flow_control(ch);
708 } else if (ch->ch_c_iflag & IXOFF) {
710 * If start/stop is set to disable, then we should disable
713 if ((ch->ch_startc == _POSIX_VDISABLE) ||
714 (ch->ch_stopc == _POSIX_VDISABLE))
715 cls_set_no_input_flow_control(ch);
717 cls_set_ixoff_flow_control(ch);
719 cls_set_no_input_flow_control(ch);
722 cls_assert_modem_signals(ch);
724 /* Get current status of the modem signals now */
725 cls_parse_modem(ch, readb(&ch->ch_cls_uart->msr));
730 * Our board poller function.
732 static void cls_tasklet(unsigned long data)
734 struct dgnc_board *bd = (struct dgnc_board *) data;
735 struct channel_t *ch;
741 if (!bd || bd->magic != DGNC_BOARD_MAGIC) {
742 APR(("poll_tasklet() - NULL or bad bd.\n"));
746 /* Cache a couple board values */
747 DGNC_LOCK(bd->bd_lock, lock_flags);
750 DGNC_UNLOCK(bd->bd_lock, lock_flags);
753 * Do NOT allow the interrupt routine to read the intr registers
754 * Until we release this lock.
756 DGNC_LOCK(bd->bd_intr_lock, lock_flags);
759 * If board is ready, parse deeper to see if there is anything to do.
761 if ((state == BOARD_READY) && (ports > 0)) {
763 /* Loop on each port */
764 for (i = 0; i < ports; i++) {
765 ch = bd->channels[i];
770 * NOTE: Remember you CANNOT hold any channel
771 * locks when calling input.
772 * During input processing, its possible we
773 * will call ld, which might do callbacks back
779 * Channel lock is grabbed and then released
780 * inside this routine.
782 cls_copy_data_from_queue_to_uart(ch);
783 dgnc_wakeup_writes(ch);
786 * Check carrier function.
791 * The timing check of turning off the break is done
792 * inside clear_break()
794 if (ch->ch_stop_sending_break)
795 cls_clear_break(ch, 0);
799 DGNC_UNLOCK(bd->bd_intr_lock, lock_flags);
807 * Classic specific interrupt handler.
809 static irqreturn_t cls_intr(int irq, void *voidbrd)
811 struct dgnc_board *brd = (struct dgnc_board *) voidbrd;
814 unsigned long lock_flags;
817 APR(("Received interrupt (%d) with null board associated\n",
823 * Check to make sure its for us.
825 if (brd->magic != DGNC_BOARD_MAGIC) {
826 APR(("Received interrupt (%d) with a board pointer that wasn't ours!\n",
831 DGNC_LOCK(brd->bd_intr_lock, lock_flags);
836 * Check the board's global interrupt offset to see if we
837 * we actually do have an interrupt pending for us.
839 poll_reg = readb(brd->re_map_membase + UART_CLASSIC_POLL_ADDR_OFFSET);
841 /* If 0, no interrupts pending */
844 "Kernel interrupted to me, but no pending interrupts...\n"));
845 DGNC_UNLOCK(brd->bd_intr_lock, lock_flags);
849 DPR_INTR(("%s:%d poll_reg: %x\n", __FILE__, __LINE__, poll_reg));
851 /* Parse each port to find out what caused the interrupt */
852 for (i = 0; i < brd->nasync; i++)
853 cls_parse_isr(brd, i);
856 * Schedule tasklet to more in-depth servicing at a better time.
858 tasklet_schedule(&brd->helper_tasklet);
860 DGNC_UNLOCK(brd->bd_intr_lock, lock_flags);
862 DPR_INTR(("dgnc_intr finish.\n"));
867 static void cls_disable_receiver(struct channel_t *ch)
869 uchar tmp = readb(&ch->ch_cls_uart->ier);
870 tmp &= ~(UART_IER_RDI);
871 writeb(tmp, &ch->ch_cls_uart->ier);
875 static void cls_enable_receiver(struct channel_t *ch)
877 uchar tmp = readb(&ch->ch_cls_uart->ier);
878 tmp |= (UART_IER_RDI);
879 writeb(tmp, &ch->ch_cls_uart->ier);
883 static void cls_copy_data_from_uart_to_queue(struct channel_t *ch)
886 uchar linestatus = 0;
887 uchar error_mask = 0;
892 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
895 DGNC_LOCK(ch->ch_lock, lock_flags);
897 /* cache head and tail of queue */
898 head = ch->ch_r_head;
899 tail = ch->ch_r_tail;
901 /* Store how much space we have left in the queue */
902 qleft = (tail - head - 1);
904 qleft += RQUEUEMASK + 1;
907 * Create a mask to determine whether we should
908 * insert the character (if any) into our queue.
910 if (ch->ch_c_iflag & IGNBRK)
911 error_mask |= UART_LSR_BI;
914 linestatus = readb(&ch->ch_cls_uart->lsr);
916 if (!(linestatus & (UART_LSR_DR)))
920 * Discard character if we are ignoring the error mask.
922 if (linestatus & error_mask) {
925 discard = readb(&ch->ch_cls_uart->txrx);
930 * If our queue is full, we have no choice but to drop some
931 * data. The assumption is that HWFLOW or SWFLOW should have
932 * stopped things way way before we got to this point.
934 * I decided that I wanted to ditch the oldest data first,
935 * I hope thats okay with everyone? Yes? Good.
938 DPR_READ(("Queue full, dropping DATA:%x LSR:%x\n",
939 ch->ch_rqueue[tail], ch->ch_equeue[tail]));
941 ch->ch_r_tail = tail = (tail + 1) & RQUEUEMASK;
942 ch->ch_err_overrun++;
946 ch->ch_equeue[head] = linestatus & (UART_LSR_BI | UART_LSR_PE
948 ch->ch_rqueue[head] = readb(&ch->ch_cls_uart->txrx);
949 dgnc_sniff_nowait_nolock(ch, "UART READ",
950 ch->ch_rqueue + head, 1);
954 DPR_READ(("DATA/LSR pair: %x %x\n", ch->ch_rqueue[head],
955 ch->ch_equeue[head]));
957 if (ch->ch_equeue[head] & UART_LSR_PE)
959 if (ch->ch_equeue[head] & UART_LSR_BI)
961 if (ch->ch_equeue[head] & UART_LSR_FE)
964 /* Add to, and flip head if needed */
965 head = (head + 1) & RQUEUEMASK;
970 * Write new final heads to channel structure.
972 ch->ch_r_head = head & RQUEUEMASK;
973 ch->ch_e_head = head & EQUEUEMASK;
975 DGNC_UNLOCK(ch->ch_lock, lock_flags);
980 * This function basically goes to sleep for secs, or until
981 * it gets signalled that the port has fully drained.
983 static int cls_drain(struct tty_struct *tty, uint seconds)
986 struct channel_t *ch;
990 if (!tty || tty->magic != TTY_MAGIC)
993 un = (struct un_t *) tty->driver_data;
994 if (!un || un->magic != DGNC_UNIT_MAGIC)
998 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
1001 DGNC_LOCK(ch->ch_lock, lock_flags);
1002 un->un_flags |= UN_EMPTY;
1003 DGNC_UNLOCK(ch->ch_lock, lock_flags);
1006 * NOTE: Do something with time passed in.
1008 rc = wait_event_interruptible(un->un_flags_wait,
1009 ((un->un_flags & UN_EMPTY) == 0));
1011 /* If ret is non-zero, user ctrl-c'ed us */
1013 DPR_IOCTL(("%d Drain - User ctrl c'ed\n", __LINE__));
1019 /* Channel lock MUST be held before calling this function! */
1020 static void cls_flush_uart_write(struct channel_t *ch)
1022 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
1025 writeb((UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_XMIT),
1026 &ch->ch_cls_uart->isr_fcr);
1029 ch->ch_flags |= (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM);
1033 /* Channel lock MUST be held before calling this function! */
1034 static void cls_flush_uart_read(struct channel_t *ch)
1036 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
1040 * For complete POSIX compatibility, we should be purging the
1041 * read FIFO in the UART here.
1043 * However, doing the statement below also incorrectly flushes
1044 * write data as well as just basically trashing the FIFO.
1046 * I believe this is a BUG in this UART.
1047 * So for now, we will leave the code #ifdef'ed out...
1050 writeb((UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR),
1051 &ch->ch_cls_uart->isr_fcr);
1057 static void cls_copy_data_from_queue_to_uart(struct channel_t *ch)
1063 uint len_written = 0;
1066 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
1069 DGNC_LOCK(ch->ch_lock, lock_flags);
1071 /* No data to write to the UART */
1072 if (ch->ch_w_tail == ch->ch_w_head) {
1073 DGNC_UNLOCK(ch->ch_lock, lock_flags);
1077 /* If port is "stopped", don't send any data to the UART */
1078 if ((ch->ch_flags & CH_FORCED_STOP) ||
1079 (ch->ch_flags & CH_BREAK_SENDING)) {
1080 DGNC_UNLOCK(ch->ch_lock, lock_flags);
1084 if (!(ch->ch_flags & (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM))) {
1085 DGNC_UNLOCK(ch->ch_lock, lock_flags);
1091 /* cache head and tail of queue */
1092 head = ch->ch_w_head & WQUEUEMASK;
1093 tail = ch->ch_w_tail & WQUEUEMASK;
1094 qlen = (head - tail) & WQUEUEMASK;
1096 /* Find minimum of the FIFO space, versus queue length */
1102 * If RTS Toggle mode is on, turn on RTS now if not already set,
1103 * and make sure we get an event when the data transfer has
1106 if (ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) {
1107 if (!(ch->ch_mostat & UART_MCR_RTS)) {
1108 ch->ch_mostat |= (UART_MCR_RTS);
1109 cls_assert_modem_signals(ch);
1111 ch->ch_tun.un_flags |= (UN_EMPTY);
1115 * If DTR Toggle mode is on, turn on DTR now if not already set,
1116 * and make sure we get an event when the data transfer has
1119 if (ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) {
1120 if (!(ch->ch_mostat & UART_MCR_DTR)) {
1121 ch->ch_mostat |= (UART_MCR_DTR);
1122 cls_assert_modem_signals(ch);
1124 ch->ch_tun.un_flags |= (UN_EMPTY);
1126 writeb(ch->ch_wqueue[ch->ch_w_tail], &ch->ch_cls_uart->txrx);
1127 dgnc_sniff_nowait_nolock(ch, "UART WRITE",
1128 ch->ch_wqueue + ch->ch_w_tail, 1);
1129 DPR_WRITE(("Tx data: %x\n", ch->ch_wqueue[ch->ch_w_tail]));
1131 ch->ch_w_tail &= WQUEUEMASK;
1137 if (len_written > 0)
1138 ch->ch_flags &= ~(CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM);
1140 DGNC_UNLOCK(ch->ch_lock, lock_flags);
1146 static void cls_parse_modem(struct channel_t *ch, uchar signals)
1148 uchar msignals = signals;
1151 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
1154 DPR_MSIGS(("cls_parse_modem: port: %d signals: %d\n",
1155 ch->ch_portnum, msignals));
1158 * Do altpin switching. Altpin switches DCD and DSR.
1159 * This prolly breaks DSRPACE, so we should be more clever here.
1161 DGNC_LOCK(ch->ch_lock, lock_flags);
1162 if (ch->ch_digi.digi_flags & DIGI_ALTPIN) {
1163 uchar mswap = signals;
1164 if (mswap & UART_MSR_DDCD) {
1165 msignals &= ~UART_MSR_DDCD;
1166 msignals |= UART_MSR_DDSR;
1168 if (mswap & UART_MSR_DDSR) {
1169 msignals &= ~UART_MSR_DDSR;
1170 msignals |= UART_MSR_DDCD;
1172 if (mswap & UART_MSR_DCD) {
1173 msignals &= ~UART_MSR_DCD;
1174 msignals |= UART_MSR_DSR;
1176 if (mswap & UART_MSR_DSR) {
1177 msignals &= ~UART_MSR_DSR;
1178 msignals |= UART_MSR_DCD;
1181 DGNC_UNLOCK(ch->ch_lock, lock_flags);
1184 * Scrub off lower bits. They signify delta's, which I don't
1189 DGNC_LOCK(ch->ch_lock, lock_flags);
1190 if (msignals & UART_MSR_DCD)
1191 ch->ch_mistat |= UART_MSR_DCD;
1193 ch->ch_mistat &= ~UART_MSR_DCD;
1195 if (msignals & UART_MSR_DSR)
1196 ch->ch_mistat |= UART_MSR_DSR;
1198 ch->ch_mistat &= ~UART_MSR_DSR;
1200 if (msignals & UART_MSR_RI)
1201 ch->ch_mistat |= UART_MSR_RI;
1203 ch->ch_mistat &= ~UART_MSR_RI;
1205 if (msignals & UART_MSR_CTS)
1206 ch->ch_mistat |= UART_MSR_CTS;
1208 ch->ch_mistat &= ~UART_MSR_CTS;
1209 DGNC_UNLOCK(ch->ch_lock, lock_flags);
1213 "Port: %d DTR: %d RTS: %d CTS: %d DSR: %d " "RI: %d CD: %d\n",
1215 !!((ch->ch_mistat | ch->ch_mostat) & UART_MCR_DTR),
1216 !!((ch->ch_mistat | ch->ch_mostat) & UART_MCR_RTS),
1217 !!((ch->ch_mistat | ch->ch_mostat) & UART_MSR_CTS),
1218 !!((ch->ch_mistat | ch->ch_mostat) & UART_MSR_DSR),
1219 !!((ch->ch_mistat | ch->ch_mostat) & UART_MSR_RI),
1220 !!((ch->ch_mistat | ch->ch_mostat) & UART_MSR_DCD)));
1224 /* Make the UART raise any of the output signals we want up */
1225 static void cls_assert_modem_signals(struct channel_t *ch)
1229 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
1232 out = ch->ch_mostat;
1234 if (ch->ch_flags & CH_LOOPBACK)
1235 out |= UART_MCR_LOOP;
1237 writeb(out, &ch->ch_cls_uart->mcr);
1239 /* Give time for the UART to actually drop the signals */
1244 static void cls_send_start_character(struct channel_t *ch)
1246 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
1249 if (ch->ch_startc != _POSIX_VDISABLE) {
1251 writeb(ch->ch_startc, &ch->ch_cls_uart->txrx);
1256 static void cls_send_stop_character(struct channel_t *ch)
1258 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
1261 if (ch->ch_stopc != _POSIX_VDISABLE) {
1262 ch->ch_xoff_sends++;
1263 writeb(ch->ch_stopc, &ch->ch_cls_uart->txrx);
1269 static void cls_uart_init(struct channel_t *ch)
1271 uchar lcrb = readb(&ch->ch_cls_uart->lcr);
1274 writeb(0, &ch->ch_cls_uart->ier);
1277 * The Enhanced Register Set may only be accessed when
1278 * the Line Control Register is set to 0xBFh.
1280 writeb(UART_EXAR654_ENHANCED_REGISTER_SET, &ch->ch_cls_uart->lcr);
1282 isr_fcr = readb(&ch->ch_cls_uart->isr_fcr);
1284 /* Turn on Enhanced/Extended controls */
1285 isr_fcr |= (UART_EXAR654_EFR_ECB);
1287 writeb(isr_fcr, &ch->ch_cls_uart->isr_fcr);
1289 /* Write old LCR value back out, which turns enhanced access off */
1290 writeb(lcrb, &ch->ch_cls_uart->lcr);
1292 /* Clear out UART and FIFO */
1293 readb(&ch->ch_cls_uart->txrx);
1295 writeb((UART_FCR_ENABLE_FIFO|UART_FCR_CLEAR_RCVR|UART_FCR_CLEAR_XMIT),
1296 &ch->ch_cls_uart->isr_fcr);
1299 ch->ch_flags |= (CH_FIFO_ENABLED | CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM);
1301 readb(&ch->ch_cls_uart->lsr);
1302 readb(&ch->ch_cls_uart->msr);
1309 static void cls_uart_off(struct channel_t *ch)
1311 writeb(0, &ch->ch_cls_uart->ier);
1316 * cls_get_uarts_bytes_left.
1317 * Returns 0 is nothing left in the FIFO, returns 1 otherwise.
1319 * The channel lock MUST be held by the calling function.
1321 static uint cls_get_uart_bytes_left(struct channel_t *ch)
1326 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
1329 lsr = readb(&ch->ch_cls_uart->lsr);
1331 /* Determine whether the Transmitter is empty or not */
1332 if (!(lsr & UART_LSR_TEMT)) {
1333 if (ch->ch_flags & CH_TX_FIFO_EMPTY)
1334 tasklet_schedule(&ch->ch_bd->helper_tasklet);
1337 ch->ch_flags |= (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM);
1347 * Starts sending a break thru the UART.
1349 * The channel lock MUST be held by the calling function.
1351 static void cls_send_break(struct channel_t *ch, int msecs)
1353 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
1357 * If we receive a time of 0, this means turn off the break.
1360 /* Turn break off, and unset some variables */
1361 if (ch->ch_flags & CH_BREAK_SENDING) {
1362 uchar temp = readb(&ch->ch_cls_uart->lcr);
1363 writeb((temp & ~UART_LCR_SBC), &ch->ch_cls_uart->lcr);
1364 ch->ch_flags &= ~(CH_BREAK_SENDING);
1365 ch->ch_stop_sending_break = 0;
1366 DPR_IOCTL(("Finishing UART_LCR_SBC! finished: %lx\n",
1373 * Set the time we should stop sending the break.
1374 * If we are already sending a break, toss away the existing
1375 * time to stop, and use this new value instead.
1377 ch->ch_stop_sending_break = jiffies + dgnc_jiffies_from_ms(msecs);
1379 /* Tell the UART to start sending the break */
1380 if (!(ch->ch_flags & CH_BREAK_SENDING)) {
1381 uchar temp = readb(&ch->ch_cls_uart->lcr);
1382 writeb((temp | UART_LCR_SBC), &ch->ch_cls_uart->lcr);
1383 ch->ch_flags |= (CH_BREAK_SENDING);
1385 "Port %d. Starting UART_LCR_SBC! start: %lx should end: %lx\n",
1386 ch->ch_portnum, jiffies, ch->ch_stop_sending_break));
1392 * cls_send_immediate_char.
1393 * Sends a specific character as soon as possible to the UART,
1394 * jumping over any bytes that might be in the write queue.
1396 * The channel lock MUST be held by the calling function.
1398 static void cls_send_immediate_char(struct channel_t *ch, unsigned char c)
1400 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
1403 writeb(c, &ch->ch_cls_uart->txrx);
1406 static void cls_vpd(struct dgnc_board *brd)
1408 ulong vpdbase; /* Start of io base of the card */
1409 u8 __iomem *re_map_vpdbase;/* Remapped memory of the card */
1413 vpdbase = pci_resource_start(brd->pdev, 3);
1419 re_map_vpdbase = ioremap(vpdbase, 0x400);
1421 if (!re_map_vpdbase)
1424 /* Store the VPD into our buffer */
1425 for (i = 0; i < 0x40; i++) {
1426 brd->vpd[i] = readb(re_map_vpdbase + i);
1427 pr_info("%x ", brd->vpd[i]);
1432 iounmap(re_map_vpdbase);