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 /* Received Xoff signal/Special character */
457 if (isr & UART_IIR_XOFF)
460 /* CTS/RTS change of state */
461 if (isr & UART_IIR_CTSRTS) {
465 * Don't need to do anything, the cls_parse_modem
466 * below will grab the updated modem signals.
470 /* Parse any modem signal changes */
471 DPR_INTR(("MOD_STAT: sending to parse_modem_sigs\n"));
472 cls_parse_modem(ch, readb(&ch->ch_cls_uart->msr));
479 * Send any/all changes to the line to the UART.
481 static void cls_param(struct tty_struct *tty)
489 struct dgnc_board *bd;
490 struct channel_t *ch;
493 if (!tty || tty->magic != TTY_MAGIC)
496 un = (struct un_t *) tty->driver_data;
497 if (!un || un->magic != DGNC_UNIT_MAGIC)
501 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
505 if (!bd || bd->magic != DGNC_BOARD_MAGIC)
508 DPR_PARAM(("param start: tdev: %x cflags: %x oflags: %x iflags: %x\n",
509 ch->ch_tun.un_dev, ch->ch_c_cflag, ch->ch_c_oflag,
513 * If baud rate is zero, flush queues, and set mval to drop DTR.
515 if ((ch->ch_c_cflag & (CBAUD)) == 0) {
516 ch->ch_r_head = ch->ch_r_tail = 0;
517 ch->ch_e_head = ch->ch_e_tail = 0;
518 ch->ch_w_head = ch->ch_w_tail = 0;
520 cls_flush_uart_write(ch);
521 cls_flush_uart_read(ch);
523 /* The baudrate is B0 so all modem lines are to be dropped. */
524 ch->ch_flags |= (CH_BAUD0);
525 ch->ch_mostat &= ~(UART_MCR_RTS | UART_MCR_DTR);
526 cls_assert_modem_signals(ch);
529 } else if (ch->ch_custom_speed) {
531 baud = ch->ch_custom_speed;
532 /* Handle transition from B0 */
533 if (ch->ch_flags & CH_BAUD0) {
534 ch->ch_flags &= ~(CH_BAUD0);
537 * Bring back up RTS and DTR...
538 * Also handle RTS or DTR toggle if set.
540 if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE))
541 ch->ch_mostat |= (UART_MCR_RTS);
542 if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE))
543 ch->ch_mostat |= (UART_MCR_DTR);
550 ulong bauds[4][16] = {
554 600, 1200, 1800, 2400,
555 4800, 9600, 19200, 38400 },
556 { /* slowbaud & CBAUDEX */
557 0, 57600, 115200, 230400,
558 460800, 150, 200, 921600,
559 600, 1200, 1800, 2400,
560 4800, 9600, 19200, 38400 },
562 0, 57600, 76800, 115200,
563 131657, 153600, 230400, 460800,
564 921600, 1200, 1800, 2400,
565 4800, 9600, 19200, 38400 },
566 { /* fastbaud & CBAUDEX */
567 0, 57600, 115200, 230400,
568 460800, 150, 200, 921600,
569 600, 1200, 1800, 2400,
570 4800, 9600, 19200, 38400 }
574 * Only use the TXPrint baud rate if the terminal
577 if (!(ch->ch_tun.un_flags & UN_ISOPEN) &&
578 (un->un_type == DGNC_PRINT))
579 baud = C_BAUD(ch->ch_pun.un_tty) & 0xff;
581 baud = C_BAUD(ch->ch_tun.un_tty) & 0xff;
583 if (ch->ch_c_cflag & CBAUDEX)
586 if (ch->ch_digi.digi_flags & DIGI_FAST)
591 if ((iindex >= 0) && (iindex < 4) && (jindex >= 0) &&
593 baud = bauds[iindex][jindex];
595 DPR_IOCTL(("baud indices were out of range (%d)(%d)",
603 /* Handle transition from B0 */
604 if (ch->ch_flags & CH_BAUD0) {
605 ch->ch_flags &= ~(CH_BAUD0);
608 * Bring back up RTS and DTR...
609 * Also handle RTS or DTR toggle if set.
611 if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE))
612 ch->ch_mostat |= (UART_MCR_RTS);
613 if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE))
614 ch->ch_mostat |= (UART_MCR_DTR);
618 if (ch->ch_c_cflag & PARENB)
619 lcr |= UART_LCR_PARITY;
621 if (!(ch->ch_c_cflag & PARODD))
622 lcr |= UART_LCR_EPAR;
625 * Not all platforms support mark/space parity,
626 * so this will hide behind an ifdef.
629 if (ch->ch_c_cflag & CMSPAR)
630 lcr |= UART_LCR_SPAR;
633 if (ch->ch_c_cflag & CSTOPB)
634 lcr |= UART_LCR_STOP;
636 switch (ch->ch_c_cflag & CSIZE) {
638 lcr |= UART_LCR_WLEN5;
641 lcr |= UART_LCR_WLEN6;
644 lcr |= UART_LCR_WLEN7;
648 lcr |= UART_LCR_WLEN8;
652 ier = uart_ier = readb(&ch->ch_cls_uart->ier);
653 uart_lcr = readb(&ch->ch_cls_uart->lcr);
658 quot = ch->ch_bd->bd_dividend / baud;
660 if (quot != 0 && ch->ch_old_baud != baud) {
661 ch->ch_old_baud = baud;
662 writeb(UART_LCR_DLAB, &ch->ch_cls_uart->lcr);
663 writeb((quot & 0xff), &ch->ch_cls_uart->txrx);
664 writeb((quot >> 8), &ch->ch_cls_uart->ier);
665 writeb(lcr, &ch->ch_cls_uart->lcr);
669 writeb(lcr, &ch->ch_cls_uart->lcr);
671 if (ch->ch_c_cflag & CREAD)
672 ier |= (UART_IER_RDI | UART_IER_RLSI);
674 ier &= ~(UART_IER_RDI | UART_IER_RLSI);
677 * Have the UART interrupt on modem signal changes ONLY when
678 * we are in hardware flow control mode, or CLOCAL/FORCEDCD is not set.
680 if ((ch->ch_digi.digi_flags & CTSPACE) ||
681 (ch->ch_digi.digi_flags & RTSPACE) ||
682 (ch->ch_c_cflag & CRTSCTS) ||
683 !(ch->ch_digi.digi_flags & DIGI_FORCEDCD) ||
684 !(ch->ch_c_cflag & CLOCAL))
687 ier &= ~UART_IER_MSI;
689 ier |= UART_IER_THRI;
692 writeb(ier, &ch->ch_cls_uart->ier);
694 if (ch->ch_digi.digi_flags & CTSPACE || ch->ch_c_cflag & CRTSCTS) {
695 cls_set_cts_flow_control(ch);
696 } else if (ch->ch_c_iflag & IXON) {
698 * If start/stop is set to disable, then we should
699 * disable flow control
701 if ((ch->ch_startc == _POSIX_VDISABLE) ||
702 (ch->ch_stopc == _POSIX_VDISABLE))
703 cls_set_no_output_flow_control(ch);
705 cls_set_ixon_flow_control(ch);
707 cls_set_no_output_flow_control(ch);
710 if (ch->ch_digi.digi_flags & RTSPACE || ch->ch_c_cflag & CRTSCTS) {
711 cls_set_rts_flow_control(ch);
712 } else if (ch->ch_c_iflag & IXOFF) {
714 * If start/stop is set to disable, then we should disable
717 if ((ch->ch_startc == _POSIX_VDISABLE) ||
718 (ch->ch_stopc == _POSIX_VDISABLE))
719 cls_set_no_input_flow_control(ch);
721 cls_set_ixoff_flow_control(ch);
723 cls_set_no_input_flow_control(ch);
726 cls_assert_modem_signals(ch);
728 /* Get current status of the modem signals now */
729 cls_parse_modem(ch, readb(&ch->ch_cls_uart->msr));
734 * Our board poller function.
736 static void cls_tasklet(unsigned long data)
738 struct dgnc_board *bd = (struct dgnc_board *) data;
739 struct channel_t *ch;
745 if (!bd || bd->magic != DGNC_BOARD_MAGIC) {
746 APR(("poll_tasklet() - NULL or bad bd.\n"));
750 /* Cache a couple board values */
751 DGNC_LOCK(bd->bd_lock, lock_flags);
754 DGNC_UNLOCK(bd->bd_lock, lock_flags);
757 * Do NOT allow the interrupt routine to read the intr registers
758 * Until we release this lock.
760 DGNC_LOCK(bd->bd_intr_lock, lock_flags);
763 * If board is ready, parse deeper to see if there is anything to do.
765 if ((state == BOARD_READY) && (ports > 0)) {
767 /* Loop on each port */
768 for (i = 0; i < ports; i++) {
769 ch = bd->channels[i];
774 * NOTE: Remember you CANNOT hold any channel
775 * locks when calling input.
776 * During input processing, its possible we
777 * will call ld, which might do callbacks back
783 * Channel lock is grabbed and then released
784 * inside this routine.
786 cls_copy_data_from_queue_to_uart(ch);
787 dgnc_wakeup_writes(ch);
790 * Check carrier function.
795 * The timing check of turning off the break is done
796 * inside clear_break()
798 if (ch->ch_stop_sending_break)
799 cls_clear_break(ch, 0);
803 DGNC_UNLOCK(bd->bd_intr_lock, lock_flags);
811 * Classic specific interrupt handler.
813 static irqreturn_t cls_intr(int irq, void *voidbrd)
815 struct dgnc_board *brd = (struct dgnc_board *) voidbrd;
818 unsigned long lock_flags;
821 APR(("Received interrupt (%d) with null board associated\n",
827 * Check to make sure its for us.
829 if (brd->magic != DGNC_BOARD_MAGIC) {
831 "Received interrupt (%d) with a board pointer "
832 "that wasn't ours!\n", irq));
836 DGNC_LOCK(brd->bd_intr_lock, lock_flags);
841 * Check the board's global interrupt offset to see if we
842 * we actually do have an interrupt pending for us.
844 poll_reg = readb(brd->re_map_membase + UART_CLASSIC_POLL_ADDR_OFFSET);
846 /* If 0, no interrupts pending */
849 "Kernel interrupted to me, but no pending "
851 DGNC_UNLOCK(brd->bd_intr_lock, lock_flags);
855 DPR_INTR(("%s:%d poll_reg: %x\n", __FILE__, __LINE__, poll_reg));
857 /* Parse each port to find out what caused the interrupt */
858 for (i = 0; i < brd->nasync; i++)
859 cls_parse_isr(brd, i);
862 * Schedule tasklet to more in-depth servicing at a better time.
864 tasklet_schedule(&brd->helper_tasklet);
866 DGNC_UNLOCK(brd->bd_intr_lock, lock_flags);
868 DPR_INTR(("dgnc_intr finish.\n"));
873 static void cls_disable_receiver(struct channel_t *ch)
875 uchar tmp = readb(&ch->ch_cls_uart->ier);
876 tmp &= ~(UART_IER_RDI);
877 writeb(tmp, &ch->ch_cls_uart->ier);
881 static void cls_enable_receiver(struct channel_t *ch)
883 uchar tmp = readb(&ch->ch_cls_uart->ier);
884 tmp |= (UART_IER_RDI);
885 writeb(tmp, &ch->ch_cls_uart->ier);
889 static void cls_copy_data_from_uart_to_queue(struct channel_t *ch)
892 uchar linestatus = 0;
893 uchar error_mask = 0;
898 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
901 DGNC_LOCK(ch->ch_lock, lock_flags);
903 /* cache head and tail of queue */
904 head = ch->ch_r_head;
905 tail = ch->ch_r_tail;
907 /* Store how much space we have left in the queue */
908 qleft = (tail - head - 1);
910 qleft += RQUEUEMASK + 1;
913 * Create a mask to determine whether we should
914 * insert the character (if any) into our queue.
916 if (ch->ch_c_iflag & IGNBRK)
917 error_mask |= UART_LSR_BI;
920 linestatus = readb(&ch->ch_cls_uart->lsr);
922 if (!(linestatus & (UART_LSR_DR)))
926 * Discard character if we are ignoring the error mask.
928 if (linestatus & error_mask) {
931 discard = readb(&ch->ch_cls_uart->txrx);
936 * If our queue is full, we have no choice but to drop some
937 * data. The assumption is that HWFLOW or SWFLOW should have
938 * stopped things way way before we got to this point.
940 * I decided that I wanted to ditch the oldest data first,
941 * I hope thats okay with everyone? Yes? Good.
944 DPR_READ(("Queue full, dropping DATA:%x LSR:%x\n",
945 ch->ch_rqueue[tail], ch->ch_equeue[tail]));
947 ch->ch_r_tail = tail = (tail + 1) & RQUEUEMASK;
948 ch->ch_err_overrun++;
952 ch->ch_equeue[head] = linestatus & (UART_LSR_BI | UART_LSR_PE
954 ch->ch_rqueue[head] = readb(&ch->ch_cls_uart->txrx);
955 dgnc_sniff_nowait_nolock(ch, "UART READ",
956 ch->ch_rqueue + head, 1);
960 DPR_READ(("DATA/LSR pair: %x %x\n", ch->ch_rqueue[head],
961 ch->ch_equeue[head]));
963 if (ch->ch_equeue[head] & UART_LSR_PE)
965 if (ch->ch_equeue[head] & UART_LSR_BI)
967 if (ch->ch_equeue[head] & UART_LSR_FE)
970 /* Add to, and flip head if needed */
971 head = (head + 1) & RQUEUEMASK;
976 * Write new final heads to channel structure.
978 ch->ch_r_head = head & RQUEUEMASK;
979 ch->ch_e_head = head & EQUEUEMASK;
981 DGNC_UNLOCK(ch->ch_lock, lock_flags);
986 * This function basically goes to sleep for secs, or until
987 * it gets signalled that the port has fully drained.
989 static int cls_drain(struct tty_struct *tty, uint seconds)
992 struct channel_t *ch;
996 if (!tty || tty->magic != TTY_MAGIC)
999 un = (struct un_t *) tty->driver_data;
1000 if (!un || un->magic != DGNC_UNIT_MAGIC)
1004 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
1007 DGNC_LOCK(ch->ch_lock, lock_flags);
1008 un->un_flags |= UN_EMPTY;
1009 DGNC_UNLOCK(ch->ch_lock, lock_flags);
1012 * NOTE: Do something with time passed in.
1014 rc = wait_event_interruptible(un->un_flags_wait,
1015 ((un->un_flags & UN_EMPTY) == 0));
1017 /* If ret is non-zero, user ctrl-c'ed us */
1019 DPR_IOCTL(("%d Drain - User ctrl c'ed\n", __LINE__));
1025 /* Channel lock MUST be held before calling this function! */
1026 static void cls_flush_uart_write(struct channel_t *ch)
1028 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
1031 writeb((UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_XMIT),
1032 &ch->ch_cls_uart->isr_fcr);
1035 ch->ch_flags |= (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM);
1039 /* Channel lock MUST be held before calling this function! */
1040 static void cls_flush_uart_read(struct channel_t *ch)
1042 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
1046 * For complete POSIX compatibility, we should be purging the
1047 * read FIFO in the UART here.
1049 * However, doing the statement below also incorrectly flushes
1050 * write data as well as just basically trashing the FIFO.
1052 * I believe this is a BUG in this UART.
1053 * So for now, we will leave the code #ifdef'ed out...
1056 writeb((UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR),
1057 &ch->ch_cls_uart->isr_fcr);
1063 static void cls_copy_data_from_queue_to_uart(struct channel_t *ch)
1069 uint len_written = 0;
1072 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
1075 DGNC_LOCK(ch->ch_lock, lock_flags);
1077 /* No data to write to the UART */
1078 if (ch->ch_w_tail == ch->ch_w_head) {
1079 DGNC_UNLOCK(ch->ch_lock, lock_flags);
1083 /* If port is "stopped", don't send any data to the UART */
1084 if ((ch->ch_flags & CH_FORCED_STOP) ||
1085 (ch->ch_flags & CH_BREAK_SENDING)) {
1086 DGNC_UNLOCK(ch->ch_lock, lock_flags);
1090 if (!(ch->ch_flags & (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM))) {
1091 DGNC_UNLOCK(ch->ch_lock, lock_flags);
1097 /* cache head and tail of queue */
1098 head = ch->ch_w_head & WQUEUEMASK;
1099 tail = ch->ch_w_tail & WQUEUEMASK;
1100 qlen = (head - tail) & WQUEUEMASK;
1102 /* Find minimum of the FIFO space, versus queue length */
1108 * If RTS Toggle mode is on, turn on RTS now if not already set,
1109 * and make sure we get an event when the data transfer has
1112 if (ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) {
1113 if (!(ch->ch_mostat & UART_MCR_RTS)) {
1114 ch->ch_mostat |= (UART_MCR_RTS);
1115 cls_assert_modem_signals(ch);
1117 ch->ch_tun.un_flags |= (UN_EMPTY);
1121 * If DTR Toggle mode is on, turn on DTR now if not already set,
1122 * and make sure we get an event when the data transfer has
1125 if (ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) {
1126 if (!(ch->ch_mostat & UART_MCR_DTR)) {
1127 ch->ch_mostat |= (UART_MCR_DTR);
1128 cls_assert_modem_signals(ch);
1130 ch->ch_tun.un_flags |= (UN_EMPTY);
1132 writeb(ch->ch_wqueue[ch->ch_w_tail], &ch->ch_cls_uart->txrx);
1133 dgnc_sniff_nowait_nolock(ch, "UART WRITE",
1134 ch->ch_wqueue + ch->ch_w_tail, 1);
1135 DPR_WRITE(("Tx data: %x\n", ch->ch_wqueue[ch->ch_w_tail]));
1137 ch->ch_w_tail &= WQUEUEMASK;
1143 if (len_written > 0)
1144 ch->ch_flags &= ~(CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM);
1146 DGNC_UNLOCK(ch->ch_lock, lock_flags);
1152 static void cls_parse_modem(struct channel_t *ch, uchar signals)
1154 uchar msignals = signals;
1157 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
1160 DPR_MSIGS(("cls_parse_modem: port: %d signals: %d\n",
1161 ch->ch_portnum, msignals));
1164 * Do altpin switching. Altpin switches DCD and DSR.
1165 * This prolly breaks DSRPACE, so we should be more clever here.
1167 DGNC_LOCK(ch->ch_lock, lock_flags);
1168 if (ch->ch_digi.digi_flags & DIGI_ALTPIN) {
1169 uchar mswap = signals;
1170 if (mswap & UART_MSR_DDCD) {
1171 msignals &= ~UART_MSR_DDCD;
1172 msignals |= UART_MSR_DDSR;
1174 if (mswap & UART_MSR_DDSR) {
1175 msignals &= ~UART_MSR_DDSR;
1176 msignals |= UART_MSR_DDCD;
1178 if (mswap & UART_MSR_DCD) {
1179 msignals &= ~UART_MSR_DCD;
1180 msignals |= UART_MSR_DSR;
1182 if (mswap & UART_MSR_DSR) {
1183 msignals &= ~UART_MSR_DSR;
1184 msignals |= UART_MSR_DCD;
1187 DGNC_UNLOCK(ch->ch_lock, lock_flags);
1190 * Scrub off lower bits. They signify delta's, which I don't
1195 DGNC_LOCK(ch->ch_lock, lock_flags);
1196 if (msignals & UART_MSR_DCD)
1197 ch->ch_mistat |= UART_MSR_DCD;
1199 ch->ch_mistat &= ~UART_MSR_DCD;
1201 if (msignals & UART_MSR_DSR)
1202 ch->ch_mistat |= UART_MSR_DSR;
1204 ch->ch_mistat &= ~UART_MSR_DSR;
1206 if (msignals & UART_MSR_RI)
1207 ch->ch_mistat |= UART_MSR_RI;
1209 ch->ch_mistat &= ~UART_MSR_RI;
1211 if (msignals & UART_MSR_CTS)
1212 ch->ch_mistat |= UART_MSR_CTS;
1214 ch->ch_mistat &= ~UART_MSR_CTS;
1215 DGNC_UNLOCK(ch->ch_lock, lock_flags);
1219 "Port: %d DTR: %d RTS: %d CTS: %d DSR: %d " "RI: %d CD: %d\n",
1221 !!((ch->ch_mistat | ch->ch_mostat) & UART_MCR_DTR),
1222 !!((ch->ch_mistat | ch->ch_mostat) & UART_MCR_RTS),
1223 !!((ch->ch_mistat | ch->ch_mostat) & UART_MSR_CTS),
1224 !!((ch->ch_mistat | ch->ch_mostat) & UART_MSR_DSR),
1225 !!((ch->ch_mistat | ch->ch_mostat) & UART_MSR_RI),
1226 !!((ch->ch_mistat | ch->ch_mostat) & UART_MSR_DCD)));
1230 /* Make the UART raise any of the output signals we want up */
1231 static void cls_assert_modem_signals(struct channel_t *ch)
1235 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
1238 out = ch->ch_mostat;
1240 if (ch->ch_flags & CH_LOOPBACK)
1241 out |= UART_MCR_LOOP;
1243 writeb(out, &ch->ch_cls_uart->mcr);
1245 /* Give time for the UART to actually drop the signals */
1250 static void cls_send_start_character(struct channel_t *ch)
1252 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
1255 if (ch->ch_startc != _POSIX_VDISABLE) {
1257 writeb(ch->ch_startc, &ch->ch_cls_uart->txrx);
1262 static void cls_send_stop_character(struct channel_t *ch)
1264 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
1267 if (ch->ch_stopc != _POSIX_VDISABLE) {
1268 ch->ch_xoff_sends++;
1269 writeb(ch->ch_stopc, &ch->ch_cls_uart->txrx);
1275 static void cls_uart_init(struct channel_t *ch)
1277 uchar lcrb = readb(&ch->ch_cls_uart->lcr);
1280 writeb(0, &ch->ch_cls_uart->ier);
1283 * The Enhanced Register Set may only be accessed when
1284 * the Line Control Register is set to 0xBFh.
1286 writeb(UART_EXAR654_ENHANCED_REGISTER_SET, &ch->ch_cls_uart->lcr);
1288 isr_fcr = readb(&ch->ch_cls_uart->isr_fcr);
1290 /* Turn on Enhanced/Extended controls */
1291 isr_fcr |= (UART_EXAR654_EFR_ECB);
1293 writeb(isr_fcr, &ch->ch_cls_uart->isr_fcr);
1295 /* Write old LCR value back out, which turns enhanced access off */
1296 writeb(lcrb, &ch->ch_cls_uart->lcr);
1298 /* Clear out UART and FIFO */
1299 readb(&ch->ch_cls_uart->txrx);
1301 writeb((UART_FCR_ENABLE_FIFO|UART_FCR_CLEAR_RCVR|UART_FCR_CLEAR_XMIT),
1302 &ch->ch_cls_uart->isr_fcr);
1305 ch->ch_flags |= (CH_FIFO_ENABLED | CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM);
1307 readb(&ch->ch_cls_uart->lsr);
1308 readb(&ch->ch_cls_uart->msr);
1315 static void cls_uart_off(struct channel_t *ch)
1317 writeb(0, &ch->ch_cls_uart->ier);
1322 * cls_get_uarts_bytes_left.
1323 * Returns 0 is nothing left in the FIFO, returns 1 otherwise.
1325 * The channel lock MUST be held by the calling function.
1327 static uint cls_get_uart_bytes_left(struct channel_t *ch)
1332 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
1335 lsr = readb(&ch->ch_cls_uart->lsr);
1337 /* Determine whether the Transmitter is empty or not */
1338 if (!(lsr & UART_LSR_TEMT)) {
1339 if (ch->ch_flags & CH_TX_FIFO_EMPTY)
1340 tasklet_schedule(&ch->ch_bd->helper_tasklet);
1343 ch->ch_flags |= (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM);
1353 * Starts sending a break thru the UART.
1355 * The channel lock MUST be held by the calling function.
1357 static void cls_send_break(struct channel_t *ch, int msecs)
1359 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
1363 * If we receive a time of 0, this means turn off the break.
1366 /* Turn break off, and unset some variables */
1367 if (ch->ch_flags & CH_BREAK_SENDING) {
1368 uchar temp = readb(&ch->ch_cls_uart->lcr);
1369 writeb((temp & ~UART_LCR_SBC), &ch->ch_cls_uart->lcr);
1370 ch->ch_flags &= ~(CH_BREAK_SENDING);
1371 ch->ch_stop_sending_break = 0;
1372 DPR_IOCTL(("Finishing UART_LCR_SBC! finished: %lx\n",
1379 * Set the time we should stop sending the break.
1380 * If we are already sending a break, toss away the existing
1381 * time to stop, and use this new value instead.
1383 ch->ch_stop_sending_break = jiffies + dgnc_jiffies_from_ms(msecs);
1385 /* Tell the UART to start sending the break */
1386 if (!(ch->ch_flags & CH_BREAK_SENDING)) {
1387 uchar temp = readb(&ch->ch_cls_uart->lcr);
1388 writeb((temp | UART_LCR_SBC), &ch->ch_cls_uart->lcr);
1389 ch->ch_flags |= (CH_BREAK_SENDING);
1391 "Port %d. Starting UART_LCR_SBC! start: %lx "
1392 "should end: %lx\n",
1393 ch->ch_portnum, jiffies, ch->ch_stop_sending_break));
1399 * cls_send_immediate_char.
1400 * Sends a specific character as soon as possible to the UART,
1401 * jumping over any bytes that might be in the write queue.
1403 * The channel lock MUST be held by the calling function.
1405 static void cls_send_immediate_char(struct channel_t *ch, unsigned char c)
1407 if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
1410 writeb(c, &ch->ch_cls_uart->txrx);
1413 static void cls_vpd(struct dgnc_board *brd)
1415 ulong vpdbase; /* Start of io base of the card */
1416 u8 __iomem *re_map_vpdbase;/* Remapped memory of the card */
1420 vpdbase = pci_resource_start(brd->pdev, 3);
1426 re_map_vpdbase = ioremap(vpdbase, 0x400);
1428 if (!re_map_vpdbase)
1431 /* Store the VPD into our buffer */
1432 for (i = 0; i < 0x40; i++) {
1433 brd->vpd[i] = readb(re_map_vpdbase + i);
1434 pr_info("%x ", brd->vpd[i]);
1439 iounmap(re_map_vpdbase);