1 /************************************************************************
2 * Copyright 2003 Digi International (www.digi.com)
4 * Copyright (C) 2004 IBM Corporation. All rights reserved.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2, or (at your option)
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
13 * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
14 * PURPOSE. See the GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 * Temple Place - Suite 330, Boston,
21 * Contact Information:
22 * Scott H Kilau <Scott_Kilau@digi.com>
23 * Ananda Venkatarman <mansarov@us.ibm.com>
25 * 01/19/06: changed jsm_input routine to use the dynamically allocated
26 * tty_buffer changes. Contributors: Scott Kilau and Ananda V.
27 ***********************************************************************/
28 #include <linux/tty.h>
29 #include <linux/tty_flip.h>
30 #include <linux/serial_reg.h>
31 #include <linux/delay.h> /* For udelay */
32 #include <linux/pci.h>
36 static void jsm_carrier(struct jsm_channel
*ch
);
38 static inline int jsm_get_mstat(struct jsm_channel
*ch
)
43 jsm_printk(IOCTL
, INFO
, &ch
->ch_bd
->pci_dev
, "start\n");
45 mstat
= (ch
->ch_mostat
| ch
->ch_mistat
);
49 if (mstat
& UART_MCR_DTR
)
51 if (mstat
& UART_MCR_RTS
)
53 if (mstat
& UART_MSR_CTS
)
55 if (mstat
& UART_MSR_DSR
)
57 if (mstat
& UART_MSR_RI
)
59 if (mstat
& UART_MSR_DCD
)
62 jsm_printk(IOCTL
, INFO
, &ch
->ch_bd
->pci_dev
, "finish\n");
66 static unsigned int jsm_tty_tx_empty(struct uart_port
*port
)
72 * Return modem signals to ld.
74 static unsigned int jsm_tty_get_mctrl(struct uart_port
*port
)
77 struct jsm_channel
*channel
= (struct jsm_channel
*)port
;
79 jsm_printk(IOCTL
, INFO
, &channel
->ch_bd
->pci_dev
, "start\n");
81 result
= jsm_get_mstat(channel
);
86 jsm_printk(IOCTL
, INFO
, &channel
->ch_bd
->pci_dev
, "finish\n");
92 * jsm_set_modem_info()
94 * Set modem signals, called by ld.
96 static void jsm_tty_set_mctrl(struct uart_port
*port
, unsigned int mctrl
)
98 struct jsm_channel
*channel
= (struct jsm_channel
*)port
;
100 jsm_printk(IOCTL
, INFO
, &channel
->ch_bd
->pci_dev
, "start\n");
102 if (mctrl
& TIOCM_RTS
)
103 channel
->ch_mostat
|= UART_MCR_RTS
;
105 channel
->ch_mostat
&= ~UART_MCR_RTS
;
107 if (mctrl
& TIOCM_DTR
)
108 channel
->ch_mostat
|= UART_MCR_DTR
;
110 channel
->ch_mostat
&= ~UART_MCR_DTR
;
112 channel
->ch_bd
->bd_ops
->assert_modem_signals(channel
);
114 jsm_printk(IOCTL
, INFO
, &channel
->ch_bd
->pci_dev
, "finish\n");
118 static void jsm_tty_start_tx(struct uart_port
*port
)
120 struct jsm_channel
*channel
= (struct jsm_channel
*)port
;
122 jsm_printk(IOCTL
, INFO
, &channel
->ch_bd
->pci_dev
, "start\n");
124 channel
->ch_flags
&= ~(CH_STOP
);
127 jsm_printk(IOCTL
, INFO
, &channel
->ch_bd
->pci_dev
, "finish\n");
130 static void jsm_tty_stop_tx(struct uart_port
*port
)
132 struct jsm_channel
*channel
= (struct jsm_channel
*)port
;
134 jsm_printk(IOCTL
, INFO
, &channel
->ch_bd
->pci_dev
, "start\n");
136 channel
->ch_flags
|= (CH_STOP
);
138 jsm_printk(IOCTL
, INFO
, &channel
->ch_bd
->pci_dev
, "finish\n");
141 static void jsm_tty_send_xchar(struct uart_port
*port
, char ch
)
143 unsigned long lock_flags
;
144 struct jsm_channel
*channel
= (struct jsm_channel
*)port
;
145 struct ktermios
*termios
;
147 spin_lock_irqsave(&port
->lock
, lock_flags
);
148 termios
= port
->info
->port
.tty
->termios
;
149 if (ch
== termios
->c_cc
[VSTART
])
150 channel
->ch_bd
->bd_ops
->send_start_character(channel
);
152 if (ch
== termios
->c_cc
[VSTOP
])
153 channel
->ch_bd
->bd_ops
->send_stop_character(channel
);
154 spin_unlock_irqrestore(&port
->lock
, lock_flags
);
157 static void jsm_tty_stop_rx(struct uart_port
*port
)
159 struct jsm_channel
*channel
= (struct jsm_channel
*)port
;
161 channel
->ch_bd
->bd_ops
->disable_receiver(channel
);
164 static void jsm_tty_enable_ms(struct uart_port
*port
)
169 static void jsm_tty_break(struct uart_port
*port
, int break_state
)
171 unsigned long lock_flags
;
172 struct jsm_channel
*channel
= (struct jsm_channel
*)port
;
174 spin_lock_irqsave(&port
->lock
, lock_flags
);
175 if (break_state
== -1)
176 channel
->ch_bd
->bd_ops
->send_break(channel
);
178 channel
->ch_bd
->bd_ops
->clear_break(channel
, 0);
180 spin_unlock_irqrestore(&port
->lock
, lock_flags
);
183 static int jsm_tty_open(struct uart_port
*port
)
185 struct jsm_board
*brd
;
186 struct jsm_channel
*channel
= (struct jsm_channel
*)port
;
187 struct ktermios
*termios
;
189 /* Get board pointer from our array of majors we have allocated */
190 brd
= channel
->ch_bd
;
193 * Allocate channel buffers for read/write/error.
194 * Set flag, so we don't get trounced on.
196 channel
->ch_flags
|= (CH_OPENING
);
198 /* Drop locks, as malloc with GFP_KERNEL can sleep */
200 if (!channel
->ch_rqueue
) {
201 channel
->ch_rqueue
= kzalloc(RQUEUESIZE
, GFP_KERNEL
);
202 if (!channel
->ch_rqueue
) {
203 jsm_printk(INIT
, ERR
, &channel
->ch_bd
->pci_dev
,
204 "unable to allocate read queue buf");
208 if (!channel
->ch_equeue
) {
209 channel
->ch_equeue
= kzalloc(EQUEUESIZE
, GFP_KERNEL
);
210 if (!channel
->ch_equeue
) {
211 jsm_printk(INIT
, ERR
, &channel
->ch_bd
->pci_dev
,
212 "unable to allocate error queue buf");
216 if (!channel
->ch_wqueue
) {
217 channel
->ch_wqueue
= kzalloc(WQUEUESIZE
, GFP_KERNEL
);
218 if (!channel
->ch_wqueue
) {
219 jsm_printk(INIT
, ERR
, &channel
->ch_bd
->pci_dev
,
220 "unable to allocate write queue buf");
225 channel
->ch_flags
&= ~(CH_OPENING
);
227 * Initialize if neither terminal is open.
229 jsm_printk(OPEN
, INFO
, &channel
->ch_bd
->pci_dev
,
230 "jsm_open: initializing channel in open...\n");
233 * Flush input queues.
235 channel
->ch_r_head
= channel
->ch_r_tail
= 0;
236 channel
->ch_e_head
= channel
->ch_e_tail
= 0;
237 channel
->ch_w_head
= channel
->ch_w_tail
= 0;
239 brd
->bd_ops
->flush_uart_write(channel
);
240 brd
->bd_ops
->flush_uart_read(channel
);
242 channel
->ch_flags
= 0;
243 channel
->ch_cached_lsr
= 0;
244 channel
->ch_stops_sent
= 0;
246 termios
= port
->info
->port
.tty
->termios
;
247 channel
->ch_c_cflag
= termios
->c_cflag
;
248 channel
->ch_c_iflag
= termios
->c_iflag
;
249 channel
->ch_c_oflag
= termios
->c_oflag
;
250 channel
->ch_c_lflag
= termios
->c_lflag
;
251 channel
->ch_startc
= termios
->c_cc
[VSTART
];
252 channel
->ch_stopc
= termios
->c_cc
[VSTOP
];
254 /* Tell UART to init itself */
255 brd
->bd_ops
->uart_init(channel
);
258 * Run param in case we changed anything
260 brd
->bd_ops
->param(channel
);
262 jsm_carrier(channel
);
264 channel
->ch_open_count
++;
266 jsm_printk(OPEN
, INFO
, &channel
->ch_bd
->pci_dev
, "finish\n");
270 static void jsm_tty_close(struct uart_port
*port
)
272 struct jsm_board
*bd
;
274 struct jsm_channel
*channel
= (struct jsm_channel
*)port
;
276 jsm_printk(CLOSE
, INFO
, &channel
->ch_bd
->pci_dev
, "start\n");
279 ts
= port
->info
->port
.tty
->termios
;
281 channel
->ch_flags
&= ~(CH_STOPI
);
283 channel
->ch_open_count
--;
286 * If we have HUPCL set, lower DTR and RTS
288 if (channel
->ch_c_cflag
& HUPCL
) {
289 jsm_printk(CLOSE
, INFO
, &channel
->ch_bd
->pci_dev
,
290 "Close. HUPCL set, dropping DTR/RTS\n");
293 channel
->ch_mostat
&= ~(UART_MCR_DTR
| UART_MCR_RTS
);
294 bd
->bd_ops
->assert_modem_signals(channel
);
297 channel
->ch_old_baud
= 0;
299 /* Turn off UART interrupts for this port */
300 channel
->ch_bd
->bd_ops
->uart_off(channel
);
302 jsm_printk(CLOSE
, INFO
, &channel
->ch_bd
->pci_dev
, "finish\n");
305 static void jsm_tty_set_termios(struct uart_port
*port
,
306 struct ktermios
*termios
,
307 struct ktermios
*old_termios
)
309 unsigned long lock_flags
;
310 struct jsm_channel
*channel
= (struct jsm_channel
*)port
;
312 spin_lock_irqsave(&port
->lock
, lock_flags
);
313 channel
->ch_c_cflag
= termios
->c_cflag
;
314 channel
->ch_c_iflag
= termios
->c_iflag
;
315 channel
->ch_c_oflag
= termios
->c_oflag
;
316 channel
->ch_c_lflag
= termios
->c_lflag
;
317 channel
->ch_startc
= termios
->c_cc
[VSTART
];
318 channel
->ch_stopc
= termios
->c_cc
[VSTOP
];
320 channel
->ch_bd
->bd_ops
->param(channel
);
321 jsm_carrier(channel
);
322 spin_unlock_irqrestore(&port
->lock
, lock_flags
);
325 static const char *jsm_tty_type(struct uart_port
*port
)
330 static void jsm_tty_release_port(struct uart_port
*port
)
334 static int jsm_tty_request_port(struct uart_port
*port
)
339 static void jsm_config_port(struct uart_port
*port
, int flags
)
341 port
->type
= PORT_JSM
;
344 static struct uart_ops jsm_ops
= {
345 .tx_empty
= jsm_tty_tx_empty
,
346 .set_mctrl
= jsm_tty_set_mctrl
,
347 .get_mctrl
= jsm_tty_get_mctrl
,
348 .stop_tx
= jsm_tty_stop_tx
,
349 .start_tx
= jsm_tty_start_tx
,
350 .send_xchar
= jsm_tty_send_xchar
,
351 .stop_rx
= jsm_tty_stop_rx
,
352 .enable_ms
= jsm_tty_enable_ms
,
353 .break_ctl
= jsm_tty_break
,
354 .startup
= jsm_tty_open
,
355 .shutdown
= jsm_tty_close
,
356 .set_termios
= jsm_tty_set_termios
,
357 .type
= jsm_tty_type
,
358 .release_port
= jsm_tty_release_port
,
359 .request_port
= jsm_tty_request_port
,
360 .config_port
= jsm_config_port
,
366 * Init the tty subsystem. Called once per board after board has been
367 * downloaded and init'ed.
369 int __devinit
jsm_tty_init(struct jsm_board
*brd
)
373 struct jsm_channel
*ch
;
378 jsm_printk(INIT
, INFO
, &brd
->pci_dev
, "start\n");
381 * Initialize board structure elements.
384 brd
->nasync
= brd
->maxports
;
387 * Allocate channel memory that might not have been allocated
388 * when the driver was first loaded.
390 for (i
= 0; i
< brd
->nasync
; i
++) {
391 if (!brd
->channels
[i
]) {
394 * Okay to malloc with GFP_KERNEL, we are not at
395 * interrupt context, and there are no locks held.
397 brd
->channels
[i
] = kzalloc(sizeof(struct jsm_channel
), GFP_KERNEL
);
398 if (!brd
->channels
[i
]) {
399 jsm_printk(CORE
, ERR
, &brd
->pci_dev
,
400 "%s:%d Unable to allocate memory for channel struct\n",
406 ch
= brd
->channels
[0];
407 vaddr
= brd
->re_map_membase
;
409 /* Set up channel variables */
410 for (i
= 0; i
< brd
->nasync
; i
++, ch
= brd
->channels
[i
]) {
412 if (!brd
->channels
[i
])
415 spin_lock_init(&ch
->ch_lock
);
417 if (brd
->bd_uart_offset
== 0x200)
418 ch
->ch_neo_uart
= vaddr
+ (brd
->bd_uart_offset
* i
);
423 /* .25 second delay */
424 ch
->ch_close_delay
= 250;
426 init_waitqueue_head(&ch
->ch_flags_wait
);
429 jsm_printk(INIT
, INFO
, &brd
->pci_dev
, "finish\n");
433 int __devinit
jsm_uart_port_init(struct jsm_board
*brd
)
436 struct jsm_channel
*ch
;
441 jsm_printk(INIT
, INFO
, &brd
->pci_dev
, "start\n");
444 * Initialize board structure elements.
447 brd
->nasync
= brd
->maxports
;
449 /* Set up channel variables */
450 for (i
= 0; i
< brd
->nasync
; i
++, ch
= brd
->channels
[i
]) {
452 if (!brd
->channels
[i
])
455 brd
->channels
[i
]->uart_port
.irq
= brd
->irq
;
456 brd
->channels
[i
]->uart_port
.uartclk
= 14745600;
457 brd
->channels
[i
]->uart_port
.type
= PORT_JSM
;
458 brd
->channels
[i
]->uart_port
.iotype
= UPIO_MEM
;
459 brd
->channels
[i
]->uart_port
.membase
= brd
->re_map_membase
;
460 brd
->channels
[i
]->uart_port
.fifosize
= 16;
461 brd
->channels
[i
]->uart_port
.ops
= &jsm_ops
;
462 brd
->channels
[i
]->uart_port
.line
= brd
->channels
[i
]->ch_portnum
+ brd
->boardnum
* 2;
463 if (uart_add_one_port (&jsm_uart_driver
, &brd
->channels
[i
]->uart_port
))
464 printk(KERN_INFO
"Added device failed\n");
466 printk(KERN_INFO
"Added device \n");
469 jsm_printk(INIT
, INFO
, &brd
->pci_dev
, "finish\n");
473 int jsm_remove_uart_port(struct jsm_board
*brd
)
476 struct jsm_channel
*ch
;
481 jsm_printk(INIT
, INFO
, &brd
->pci_dev
, "start\n");
484 * Initialize board structure elements.
487 brd
->nasync
= brd
->maxports
;
489 /* Set up channel variables */
490 for (i
= 0; i
< brd
->nasync
; i
++) {
492 if (!brd
->channels
[i
])
495 ch
= brd
->channels
[i
];
497 uart_remove_one_port(&jsm_uart_driver
, &brd
->channels
[i
]->uart_port
);
500 jsm_printk(INIT
, INFO
, &brd
->pci_dev
, "finish\n");
504 void jsm_input(struct jsm_channel
*ch
)
506 struct jsm_board
*bd
;
507 struct tty_struct
*tp
;
512 unsigned long lock_flags
;
518 jsm_printk(READ
, INFO
, &ch
->ch_bd
->pci_dev
, "start\n");
523 tp
= ch
->uart_port
.info
->port
.tty
;
529 spin_lock_irqsave(&ch
->ch_lock
, lock_flags
);
532 *Figure the number of characters in the buffer.
533 *Exit immediately if none.
538 head
= ch
->ch_r_head
& rmask
;
539 tail
= ch
->ch_r_tail
& rmask
;
541 data_len
= (head
- tail
) & rmask
;
543 spin_unlock_irqrestore(&ch
->ch_lock
, lock_flags
);
547 jsm_printk(READ
, INFO
, &ch
->ch_bd
->pci_dev
, "start\n");
550 *If the device is not open, or CREAD is off, flush
551 *input data and return immediately.
554 !(tp
->termios
->c_cflag
& CREAD
) ) {
556 jsm_printk(READ
, INFO
, &ch
->ch_bd
->pci_dev
,
557 "input. dropping %d bytes on port %d...\n", data_len
, ch
->ch_portnum
);
558 ch
->ch_r_head
= tail
;
560 /* Force queue flow control to be released, if needed */
561 jsm_check_queue_flow_control(ch
);
563 spin_unlock_irqrestore(&ch
->ch_lock
, lock_flags
);
568 * If we are throttled, simply don't read any data.
570 if (ch
->ch_flags
& CH_STOPI
) {
571 spin_unlock_irqrestore(&ch
->ch_lock
, lock_flags
);
572 jsm_printk(READ
, INFO
, &ch
->ch_bd
->pci_dev
,
573 "Port %d throttled, not reading any data. head: %x tail: %x\n",
574 ch
->ch_portnum
, head
, tail
);
578 jsm_printk(READ
, INFO
, &ch
->ch_bd
->pci_dev
, "start 2\n");
581 spin_unlock_irqrestore(&ch
->ch_lock
, lock_flags
);
582 jsm_printk(READ
, INFO
, &ch
->ch_bd
->pci_dev
, "jsm_input 1\n");
586 len
= tty_buffer_request_room(tp
, data_len
);
590 * n now contains the most amount of data we can copy,
591 * bounded either by the flip buffer size or the amount
592 * of data the card actually has pending...
595 s
= ((head
>= tail
) ? head
: RQUEUESIZE
) - tail
;
602 * If conditions are such that ld needs to see all
603 * UART errors, we will have to walk each character
604 * and error byte and send them to the buffer one at
608 if (I_PARMRK(tp
) || I_BRKINT(tp
) || I_INPCK(tp
)) {
609 for (i
= 0; i
< s
; i
++) {
611 * Give the Linux ld the flags in the
614 if (*(ch
->ch_equeue
+tail
+i
) & UART_LSR_BI
)
615 tty_insert_flip_char(tp
, *(ch
->ch_rqueue
+tail
+i
), TTY_BREAK
);
616 else if (*(ch
->ch_equeue
+tail
+i
) & UART_LSR_PE
)
617 tty_insert_flip_char(tp
, *(ch
->ch_rqueue
+tail
+i
), TTY_PARITY
);
618 else if (*(ch
->ch_equeue
+tail
+i
) & UART_LSR_FE
)
619 tty_insert_flip_char(tp
, *(ch
->ch_rqueue
+tail
+i
), TTY_FRAME
);
621 tty_insert_flip_char(tp
, *(ch
->ch_rqueue
+tail
+i
), TTY_NORMAL
);
624 tty_insert_flip_string(tp
, ch
->ch_rqueue
+ tail
, s
) ;
628 /* Flip queue if needed */
632 ch
->ch_r_tail
= tail
& rmask
;
633 ch
->ch_e_tail
= tail
& rmask
;
634 jsm_check_queue_flow_control(ch
);
635 spin_unlock_irqrestore(&ch
->ch_lock
, lock_flags
);
637 /* Tell the tty layer its okay to "eat" the data now */
638 tty_flip_buffer_push(tp
);
640 jsm_printk(IOCTL
, INFO
, &ch
->ch_bd
->pci_dev
, "finish\n");
643 static void jsm_carrier(struct jsm_channel
*ch
)
645 struct jsm_board
*bd
;
647 int virt_carrier
= 0;
648 int phys_carrier
= 0;
650 jsm_printk(CARR
, INFO
, &ch
->ch_bd
->pci_dev
, "start\n");
659 if (ch
->ch_mistat
& UART_MSR_DCD
) {
660 jsm_printk(CARR
, INFO
, &ch
->ch_bd
->pci_dev
,
661 "mistat: %x D_CD: %x\n", ch
->ch_mistat
, ch
->ch_mistat
& UART_MSR_DCD
);
665 if (ch
->ch_c_cflag
& CLOCAL
)
668 jsm_printk(CARR
, INFO
, &ch
->ch_bd
->pci_dev
,
669 "DCD: physical: %d virt: %d\n", phys_carrier
, virt_carrier
);
672 * Test for a VIRTUAL carrier transition to HIGH.
674 if (((ch
->ch_flags
& CH_FCAR
) == 0) && (virt_carrier
== 1)) {
677 * When carrier rises, wake any threads waiting
678 * for carrier in the open routine.
681 jsm_printk(CARR
, INFO
, &ch
->ch_bd
->pci_dev
,
682 "carrier: virt DCD rose\n");
684 if (waitqueue_active(&(ch
->ch_flags_wait
)))
685 wake_up_interruptible(&ch
->ch_flags_wait
);
689 * Test for a PHYSICAL carrier transition to HIGH.
691 if (((ch
->ch_flags
& CH_CD
) == 0) && (phys_carrier
== 1)) {
694 * When carrier rises, wake any threads waiting
695 * for carrier in the open routine.
698 jsm_printk(CARR
, INFO
, &ch
->ch_bd
->pci_dev
,
699 "carrier: physical DCD rose\n");
701 if (waitqueue_active(&(ch
->ch_flags_wait
)))
702 wake_up_interruptible(&ch
->ch_flags_wait
);
706 * Test for a PHYSICAL transition to low, so long as we aren't
707 * currently ignoring physical transitions (which is what "virtual
708 * carrier" indicates).
710 * The transition of the virtual carrier to low really doesn't
711 * matter... it really only means "ignore carrier state", not
712 * "make pretend that carrier is there".
714 if ((virt_carrier
== 0) && ((ch
->ch_flags
& CH_CD
) != 0)
715 && (phys_carrier
== 0)) {
717 * When carrier drops:
719 * Drop carrier on all open units.
721 * Flush queues, waking up any task waiting in the
724 * Send a hangup to the control terminal.
726 * Enable all select calls.
728 if (waitqueue_active(&(ch
->ch_flags_wait
)))
729 wake_up_interruptible(&ch
->ch_flags_wait
);
733 * Make sure that our cached values reflect the current reality.
735 if (virt_carrier
== 1)
736 ch
->ch_flags
|= CH_FCAR
;
738 ch
->ch_flags
&= ~CH_FCAR
;
740 if (phys_carrier
== 1)
741 ch
->ch_flags
|= CH_CD
;
743 ch
->ch_flags
&= ~CH_CD
;
747 void jsm_check_queue_flow_control(struct jsm_channel
*ch
)
749 struct board_ops
*bd_ops
= ch
->ch_bd
->bd_ops
;
752 /* Store how much space we have left in the queue */
753 if ((qleft
= ch
->ch_r_tail
- ch
->ch_r_head
- 1) < 0)
754 qleft
+= RQUEUEMASK
+ 1;
757 * Check to see if we should enforce flow control on our queue because
758 * the ld (or user) isn't reading data out of our queue fast enuf.
760 * NOTE: This is done based on what the current flow control of the
763 * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt.
764 * This will cause the UART's FIFO to back up, and force
765 * the RTS signal to be dropped.
766 * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to
767 * the other side, in hopes it will stop sending data to us.
768 * 3) NONE - Nothing we can do. We will simply drop any extra data
769 * that gets sent into us when the queue fills up.
773 if (ch
->ch_c_cflag
& CRTSCTS
) {
774 if(!(ch
->ch_flags
& CH_RECEIVER_OFF
)) {
775 bd_ops
->disable_receiver(ch
);
776 ch
->ch_flags
|= (CH_RECEIVER_OFF
);
777 jsm_printk(READ
, INFO
, &ch
->ch_bd
->pci_dev
,
778 "Internal queue hit hilevel mark (%d)! Turning off interrupts.\n",
783 else if (ch
->ch_c_iflag
& IXOFF
) {
784 if (ch
->ch_stops_sent
<= MAX_STOPS_SENT
) {
785 bd_ops
->send_stop_character(ch
);
787 jsm_printk(READ
, INFO
, &ch
->ch_bd
->pci_dev
,
788 "Sending stop char! Times sent: %x\n", ch
->ch_stops_sent
);
794 * Check to see if we should unenforce flow control because
795 * ld (or user) finally read enuf data out of our queue.
797 * NOTE: This is done based on what the current flow control of the
800 * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt.
801 * This will cause the UART's FIFO to raise RTS back up,
802 * which will allow the other side to start sending data again.
803 * 2) SWFLOW (IXOFF) - Send a start character to
804 * the other side, so it will start sending data to us again.
805 * 3) NONE - Do nothing. Since we didn't do anything to turn off the
806 * other side, we don't need to do anything now.
808 if (qleft
> (RQUEUESIZE
/ 2)) {
810 if (ch
->ch_c_cflag
& CRTSCTS
) {
811 if (ch
->ch_flags
& CH_RECEIVER_OFF
) {
812 bd_ops
->enable_receiver(ch
);
813 ch
->ch_flags
&= ~(CH_RECEIVER_OFF
);
814 jsm_printk(READ
, INFO
, &ch
->ch_bd
->pci_dev
,
815 "Internal queue hit lowlevel mark (%d)! Turning on interrupts.\n",
820 else if (ch
->ch_c_iflag
& IXOFF
&& ch
->ch_stops_sent
) {
821 ch
->ch_stops_sent
= 0;
822 bd_ops
->send_start_character(ch
);
823 jsm_printk(READ
, INFO
, &ch
->ch_bd
->pci_dev
, "Sending start char!\n");
831 * Take data from the user or kernel and send it out to the FEP.
832 * In here exists all the Transparent Print magic as well.
834 int jsm_tty_write(struct uart_port
*port
)
837 int data_count
= 0,data_count1
=0;
842 int temp_tail
= port
->info
->xmit
.tail
;
843 struct jsm_channel
*channel
= (struct jsm_channel
*)port
;
846 head
= (channel
->ch_w_head
) & tmask
;
847 tail
= (channel
->ch_w_tail
) & tmask
;
849 if ((bufcount
= tail
- head
- 1) < 0)
850 bufcount
+= WQUEUESIZE
;
852 bufcount
= min(bufcount
, 56);
853 remain
= WQUEUESIZE
- head
;
856 if (bufcount
>= remain
) {
858 while ((port
->info
->xmit
.head
!= temp_tail
) &&
859 (data_count
< remain
)) {
860 channel
->ch_wqueue
[head
++] =
861 port
->info
->xmit
.buf
[temp_tail
];
864 temp_tail
&= (UART_XMIT_SIZE
- 1);
867 if (data_count
== remain
) head
= 0;
873 while ((port
->info
->xmit
.head
!= temp_tail
) &&
874 (data_count1
< remain
)) {
875 channel
->ch_wqueue
[head
++] =
876 port
->info
->xmit
.buf
[temp_tail
];
879 temp_tail
&= (UART_XMIT_SIZE
- 1);
885 port
->info
->xmit
.tail
= temp_tail
;
887 data_count
+= data_count1
;
890 channel
->ch_w_head
= head
;
894 channel
->ch_bd
->bd_ops
->copy_data_from_queue_to_uart(channel
);