2 * esp.c - driver for Hayes ESP serial cards
4 * --- Notices from serial.c, upon which this driver is based ---
6 * Copyright (C) 1991, 1992 Linus Torvalds
8 * Extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92. Now
9 * much more extensible to support other serial cards based on the
10 * 16450/16550A UART's. Added support for the AST FourPort and the
13 * set_serial_info fixed to set the flags, custom divisor, and uart
14 * type fields. Fix suggested by Michael K. Johnson 12/12/92.
16 * 11/95: TIOCMIWAIT, TIOCGICOUNT by Angelo Haritsis <ah@doc.ic.ac.uk>
18 * 03/96: Modularised by Angelo Haritsis <ah@doc.ic.ac.uk>
20 * rs_set_termios fixed to look also for changes of the input
21 * flags INPCK, BRKINT, PARMRK, IGNPAR and IGNBRK.
22 * Bernd Anh�pl 05/17/96.
24 * --- End of notices from serial.c ---
26 * Support for the ESP serial card by Andrew J. Robinson
27 * <arobinso@nyx.net> (Card detection routine taken from a patch
28 * by Dennis J. Boylan). Patches to allow use with 2.1.x contributed
31 * Most recent changes: (Andrew J. Robinson)
32 * Support for PIO mode. This allows the driver to work properly with
35 * Arnaldo Carvalho de Melo <acme@conectiva.com.br> -
36 * several cleanups, use module_init/module_exit, etc
38 * This module exports the following rs232 io functions:
40 * int espserial_init(void);
43 #include <linux/module.h>
44 #include <linux/errno.h>
45 #include <linux/signal.h>
46 #include <linux/sched.h>
47 #include <linux/interrupt.h>
48 #include <linux/tty.h>
49 #include <linux/tty_flip.h>
50 #include <linux/serial.h>
51 #include <linux/serialP.h>
52 #include <linux/serial_reg.h>
53 #include <linux/major.h>
54 #include <linux/string.h>
55 #include <linux/fcntl.h>
56 #include <linux/ptrace.h>
57 #include <linux/ioport.h>
59 #include <linux/init.h>
60 #include <linux/delay.h>
62 #include <asm/system.h>
64 #include <asm/bitops.h>
67 #include <linux/slab.h>
68 #include <asm/uaccess.h>
70 #include <linux/hayesesp.h>
72 #define NR_PORTS 64 /* maximum number of ports */
73 #define NR_PRIMARY 8 /* maximum number of primary ports */
74 #define REGION_SIZE 8 /* size of io region to request */
76 /* The following variables can be set by giving module options */
77 static int irq
[NR_PRIMARY
]; /* IRQ for each base port */
78 static unsigned int divisor
[NR_PRIMARY
]; /* custom divisor for each port */
79 static unsigned int dma
= ESP_DMA_CHANNEL
; /* DMA channel */
80 static unsigned int rx_trigger
= ESP_RX_TRIGGER
;
81 static unsigned int tx_trigger
= ESP_TX_TRIGGER
;
82 static unsigned int flow_off
= ESP_FLOW_OFF
;
83 static unsigned int flow_on
= ESP_FLOW_ON
;
84 static unsigned int rx_timeout
= ESP_RX_TMOUT
;
85 static unsigned int pio_threshold
= ESP_PIO_THRESHOLD
;
87 MODULE_LICENSE("GPL");
89 module_param_array(irq
, int, NULL
, 0);
90 module_param_array(divisor
, uint
, NULL
, 0);
91 module_param(dma
, uint
, 0);
92 module_param(rx_trigger
, uint
, 0);
93 module_param(tx_trigger
, uint
, 0);
94 module_param(flow_off
, uint
, 0);
95 module_param(flow_on
, uint
, 0);
96 module_param(rx_timeout
, uint
, 0);
97 module_param(pio_threshold
, uint
, 0);
101 static char *dma_buffer
;
102 static int dma_bytes
;
103 static struct esp_pio_buffer
*free_pio_buf
;
105 #define DMA_BUFFER_SZ 1024
107 #define WAKEUP_CHARS 1024
109 static char serial_name
[] __initdata
= "ESP serial driver";
110 static char serial_version
[] __initdata
= "2.2";
112 static struct tty_driver
*esp_driver
;
114 /* serial subtype definitions */
115 #define SERIAL_TYPE_NORMAL 1
118 * Serial driver configuration section. Here are the various options:
120 * SERIAL_PARANOIA_CHECK
121 * Check the magic number for the esp_structure where
125 #undef SERIAL_PARANOIA_CHECK
126 #define SERIAL_DO_RESTART
128 #undef SERIAL_DEBUG_INTR
129 #undef SERIAL_DEBUG_OPEN
130 #undef SERIAL_DEBUG_FLOW
132 #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
133 #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
134 tty->name, (info->flags), serial_driver.refcount,info->count,tty->count,s)
139 static struct esp_struct
*ports
;
141 static void change_speed(struct esp_struct
*info
);
142 static void rs_wait_until_sent(struct tty_struct
*, int);
145 * The ESP card has a clock rate of 14.7456 MHz (that is, 2**ESPC_SCALE
146 * times the normal 1.8432 Mhz clock of most serial boards).
148 #define BASE_BAUD ((1843200 / 16) * (1 << ESPC_SCALE))
150 /* Standard COM flags (except for COM4, because of the 8514 problem) */
151 #define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
154 * tmp_buf is used as a temporary buffer by serial_write. We need to
155 * lock it in case the memcpy_fromfs blocks while swapping in a page,
156 * and some other program tries to do a serial write at the same time.
157 * Since the lock will only come under contention when the system is
158 * swapping and available memory is low, it makes sense to share one
159 * buffer across all the serial ports, since it significantly saves
160 * memory if large numbers of serial ports are open.
162 static unsigned char *tmp_buf
;
164 static inline int serial_paranoia_check(struct esp_struct
*info
,
165 char *name
, const char *routine
)
167 #ifdef SERIAL_PARANOIA_CHECK
168 static const char badmagic
[] = KERN_WARNING
169 "Warning: bad magic number for serial struct (%s) in %s\n";
170 static const char badinfo
[] = KERN_WARNING
171 "Warning: null esp_struct for (%s) in %s\n";
174 printk(badinfo
, name
, routine
);
177 if (info
->magic
!= ESP_MAGIC
) {
178 printk(badmagic
, name
, routine
);
185 static inline unsigned int serial_in(struct esp_struct
*info
, int offset
)
187 return inb(info
->port
+ offset
);
190 static inline void serial_out(struct esp_struct
*info
, int offset
,
193 outb(value
, info
->port
+offset
);
197 * ------------------------------------------------------------
198 * rs_stop() and rs_start()
200 * This routines are called before setting or resetting tty->stopped.
201 * They enable or disable transmitter interrupts, as necessary.
202 * ------------------------------------------------------------
204 static void rs_stop(struct tty_struct
*tty
)
206 struct esp_struct
*info
= (struct esp_struct
*)tty
->driver_data
;
209 if (serial_paranoia_check(info
, tty
->name
, "rs_stop"))
212 spin_lock_irqsave(&info
->lock
, flags
);
213 if (info
->IER
& UART_IER_THRI
) {
214 info
->IER
&= ~UART_IER_THRI
;
215 serial_out(info
, UART_ESI_CMD1
, ESI_SET_SRV_MASK
);
216 serial_out(info
, UART_ESI_CMD2
, info
->IER
);
218 spin_unlock_irqrestore(&info
->lock
, flags
);
221 static void rs_start(struct tty_struct
*tty
)
223 struct esp_struct
*info
= (struct esp_struct
*)tty
->driver_data
;
226 if (serial_paranoia_check(info
, tty
->name
, "rs_start"))
229 spin_lock_irqsave(&info
->lock
, flags
);
230 if (info
->xmit_cnt
&& info
->xmit_buf
&& !(info
->IER
& UART_IER_THRI
)) {
231 info
->IER
|= UART_IER_THRI
;
232 serial_out(info
, UART_ESI_CMD1
, ESI_SET_SRV_MASK
);
233 serial_out(info
, UART_ESI_CMD2
, info
->IER
);
235 spin_unlock_irqrestore(&info
->lock
, flags
);
239 * ----------------------------------------------------------------------
241 * Here starts the interrupt handling routines. All of the following
242 * subroutines are declared as inline and are folded into
243 * rs_interrupt(). They were separated out for readability's sake.
245 * Note: rs_interrupt() is a "fast" interrupt, which means that it
246 * runs with interrupts turned off. People who may want to modify
247 * rs_interrupt() should try to keep the interrupt handler as fast as
248 * possible. After you are done making modifications, it is not a bad
251 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
253 * and look at the resulting assemble code in serial.s.
255 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
256 * -----------------------------------------------------------------------
260 * This routine is used by the interrupt handler to schedule
261 * processing in the software interrupt portion of the driver.
263 static inline void rs_sched_event(struct esp_struct
*info
,
266 info
->event
|= 1 << event
;
267 schedule_work(&info
->tqueue
);
270 static DEFINE_SPINLOCK(pio_lock
);
272 static inline struct esp_pio_buffer
*get_pio_buffer(void)
274 struct esp_pio_buffer
*buf
;
277 spin_lock_irqsave(&pio_lock
, flags
);
280 free_pio_buf
= buf
->next
;
282 buf
= kmalloc(sizeof(struct esp_pio_buffer
), GFP_ATOMIC
);
284 spin_unlock_irqrestore(&pio_lock
, flags
);
288 static inline void release_pio_buffer(struct esp_pio_buffer
*buf
)
291 spin_lock_irqsave(&pio_lock
, flags
);
292 buf
->next
= free_pio_buf
;
294 spin_unlock_irqrestore(&pio_lock
, flags
);
297 static inline void receive_chars_pio(struct esp_struct
*info
, int num_bytes
)
299 struct tty_struct
*tty
= info
->tty
;
301 struct esp_pio_buffer
*pio_buf
;
302 struct esp_pio_buffer
*err_buf
;
303 unsigned char status_mask
;
305 pio_buf
= get_pio_buffer();
310 err_buf
= get_pio_buffer();
313 release_pio_buffer(pio_buf
);
317 status_mask
= (info
->read_status_mask
>> 2) & 0x07;
319 for (i
= 0; i
< num_bytes
- 1; i
+= 2) {
320 *((unsigned short *)(pio_buf
->data
+ i
)) =
321 inw(info
->port
+ UART_ESI_RX
);
322 err_buf
->data
[i
] = serial_in(info
, UART_ESI_RWS
);
323 err_buf
->data
[i
+ 1] = (err_buf
->data
[i
] >> 3) & status_mask
;
324 err_buf
->data
[i
] &= status_mask
;
327 if (num_bytes
& 0x0001) {
328 pio_buf
->data
[num_bytes
- 1] = serial_in(info
, UART_ESI_RX
);
329 err_buf
->data
[num_bytes
- 1] =
330 (serial_in(info
, UART_ESI_RWS
) >> 3) & status_mask
;
333 /* make sure everything is still ok since interrupts were enabled */
337 release_pio_buffer(pio_buf
);
338 release_pio_buffer(err_buf
);
339 info
->stat_flags
&= ~ESP_STAT_RX_TIMEOUT
;
343 status_mask
= (info
->ignore_status_mask
>> 2) & 0x07;
345 for (i
= 0; i
< num_bytes
; i
++) {
346 if (!(err_buf
->data
[i
] & status_mask
)) {
349 if (err_buf
->data
[i
] & 0x04) {
351 if (info
->flags
& ASYNC_SAK
)
354 else if (err_buf
->data
[i
] & 0x02)
356 else if (err_buf
->data
[i
] & 0x01)
358 tty_insert_flip_char(tty
, pio_buf
->data
[i
], flag
);
362 schedule_delayed_work(&tty
->buf
.work
, 1);
364 info
->stat_flags
&= ~ESP_STAT_RX_TIMEOUT
;
365 release_pio_buffer(pio_buf
);
366 release_pio_buffer(err_buf
);
369 static inline void receive_chars_dma(struct esp_struct
*info
, int num_bytes
)
372 info
->stat_flags
&= ~ESP_STAT_RX_TIMEOUT
;
373 dma_bytes
= num_bytes
;
374 info
->stat_flags
|= ESP_STAT_DMA_RX
;
376 flags
=claim_dma_lock();
379 set_dma_mode(dma
, DMA_MODE_READ
);
380 set_dma_addr(dma
, isa_virt_to_bus(dma_buffer
));
381 set_dma_count(dma
, dma_bytes
);
383 release_dma_lock(flags
);
385 serial_out(info
, UART_ESI_CMD1
, ESI_START_DMA_RX
);
388 static inline void receive_chars_dma_done(struct esp_struct
*info
,
391 struct tty_struct
*tty
= info
->tty
;
395 flags
=claim_dma_lock();
399 info
->stat_flags
&= ~ESP_STAT_DMA_RX
;
400 num_bytes
= dma_bytes
- get_dma_residue(dma
);
401 release_dma_lock(flags
);
403 info
->icount
.rx
+= num_bytes
;
406 tty_insert_flip_string(tty
, dma_buffer
, num_bytes
- 1);
408 status
&= (0x1c & info
->read_status_mask
);
410 /* Is the status significant or do we throw the last byte ? */
411 if (!(status
& info
->ignore_status_mask
)) {
415 statflag
= TTY_BREAK
;
416 (info
->icount
.brk
)++;
417 if (info
->flags
& ASYNC_SAK
)
419 } else if (status
& 0x08) {
420 statflag
= TTY_FRAME
;
421 (info
->icount
.frame
)++;
423 else if (status
& 0x04) {
424 statflag
= TTY_PARITY
;
425 (info
->icount
.parity
)++;
427 tty_insert_flip_char(tty
, dma_buffer
[num_bytes
- 1], statflag
);
429 schedule_delayed_work(&tty
->buf
.work
, 1);
432 if (dma_bytes
!= num_bytes
) {
433 num_bytes
= dma_bytes
- num_bytes
;
435 receive_chars_dma(info
, num_bytes
);
440 /* Caller must hold info->lock */
442 static inline void transmit_chars_pio(struct esp_struct
*info
,
446 struct esp_pio_buffer
*pio_buf
;
448 pio_buf
= get_pio_buffer();
453 while (space_avail
&& info
->xmit_cnt
) {
454 if (info
->xmit_tail
+ space_avail
<= ESP_XMIT_SIZE
) {
455 memcpy(pio_buf
->data
,
456 &(info
->xmit_buf
[info
->xmit_tail
]),
459 i
= ESP_XMIT_SIZE
- info
->xmit_tail
;
460 memcpy(pio_buf
->data
,
461 &(info
->xmit_buf
[info
->xmit_tail
]), i
);
462 memcpy(&(pio_buf
->data
[i
]), info
->xmit_buf
,
466 info
->xmit_cnt
-= space_avail
;
467 info
->xmit_tail
= (info
->xmit_tail
+ space_avail
) &
470 for (i
= 0; i
< space_avail
- 1; i
+= 2) {
471 outw(*((unsigned short *)(pio_buf
->data
+ i
)),
472 info
->port
+ UART_ESI_TX
);
475 if (space_avail
& 0x0001)
476 serial_out(info
, UART_ESI_TX
,
477 pio_buf
->data
[space_avail
- 1]);
479 if (info
->xmit_cnt
) {
480 serial_out(info
, UART_ESI_CMD1
, ESI_NO_COMMAND
);
481 serial_out(info
, UART_ESI_CMD1
, ESI_GET_TX_AVAIL
);
482 space_avail
= serial_in(info
, UART_ESI_STAT1
) << 8;
483 space_avail
|= serial_in(info
, UART_ESI_STAT2
);
485 if (space_avail
> info
->xmit_cnt
)
486 space_avail
= info
->xmit_cnt
;
490 if (info
->xmit_cnt
< WAKEUP_CHARS
) {
491 rs_sched_event(info
, ESP_EVENT_WRITE_WAKEUP
);
493 #ifdef SERIAL_DEBUG_INTR
497 if (info
->xmit_cnt
<= 0) {
498 info
->IER
&= ~UART_IER_THRI
;
499 serial_out(info
, UART_ESI_CMD1
,
501 serial_out(info
, UART_ESI_CMD2
, info
->IER
);
505 release_pio_buffer(pio_buf
);
508 /* Caller must hold info->lock */
509 static inline void transmit_chars_dma(struct esp_struct
*info
, int num_bytes
)
513 dma_bytes
= num_bytes
;
515 if (info
->xmit_tail
+ dma_bytes
<= ESP_XMIT_SIZE
) {
516 memcpy(dma_buffer
, &(info
->xmit_buf
[info
->xmit_tail
]),
519 int i
= ESP_XMIT_SIZE
- info
->xmit_tail
;
520 memcpy(dma_buffer
, &(info
->xmit_buf
[info
->xmit_tail
]),
522 memcpy(&(dma_buffer
[i
]), info
->xmit_buf
, dma_bytes
- i
);
525 info
->xmit_cnt
-= dma_bytes
;
526 info
->xmit_tail
= (info
->xmit_tail
+ dma_bytes
) & (ESP_XMIT_SIZE
- 1);
528 if (info
->xmit_cnt
< WAKEUP_CHARS
) {
529 rs_sched_event(info
, ESP_EVENT_WRITE_WAKEUP
);
531 #ifdef SERIAL_DEBUG_INTR
535 if (info
->xmit_cnt
<= 0) {
536 info
->IER
&= ~UART_IER_THRI
;
537 serial_out(info
, UART_ESI_CMD1
, ESI_SET_SRV_MASK
);
538 serial_out(info
, UART_ESI_CMD2
, info
->IER
);
542 info
->stat_flags
|= ESP_STAT_DMA_TX
;
544 flags
=claim_dma_lock();
547 set_dma_mode(dma
, DMA_MODE_WRITE
);
548 set_dma_addr(dma
, isa_virt_to_bus(dma_buffer
));
549 set_dma_count(dma
, dma_bytes
);
551 release_dma_lock(flags
);
553 serial_out(info
, UART_ESI_CMD1
, ESI_START_DMA_TX
);
556 static inline void transmit_chars_dma_done(struct esp_struct
*info
)
562 flags
=claim_dma_lock();
566 num_bytes
= dma_bytes
- get_dma_residue(dma
);
567 info
->icount
.tx
+= dma_bytes
;
568 release_dma_lock(flags
);
570 if (dma_bytes
!= num_bytes
) {
571 dma_bytes
-= num_bytes
;
572 memmove(dma_buffer
, dma_buffer
+ num_bytes
, dma_bytes
);
574 flags
=claim_dma_lock();
577 set_dma_mode(dma
, DMA_MODE_WRITE
);
578 set_dma_addr(dma
, isa_virt_to_bus(dma_buffer
));
579 set_dma_count(dma
, dma_bytes
);
581 release_dma_lock(flags
);
583 serial_out(info
, UART_ESI_CMD1
, ESI_START_DMA_TX
);
586 info
->stat_flags
&= ~ESP_STAT_DMA_TX
;
590 static inline void check_modem_status(struct esp_struct
*info
)
594 serial_out(info
, UART_ESI_CMD1
, ESI_GET_UART_STAT
);
595 status
= serial_in(info
, UART_ESI_STAT2
);
597 if (status
& UART_MSR_ANY_DELTA
) {
598 /* update input line counters */
599 if (status
& UART_MSR_TERI
)
601 if (status
& UART_MSR_DDSR
)
603 if (status
& UART_MSR_DDCD
)
605 if (status
& UART_MSR_DCTS
)
607 wake_up_interruptible(&info
->delta_msr_wait
);
610 if ((info
->flags
& ASYNC_CHECK_CD
) && (status
& UART_MSR_DDCD
)) {
611 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
612 printk("ttys%d CD now %s...", info
->line
,
613 (status
& UART_MSR_DCD
) ? "on" : "off");
615 if (status
& UART_MSR_DCD
)
616 wake_up_interruptible(&info
->open_wait
);
618 #ifdef SERIAL_DEBUG_OPEN
619 printk("scheduling hangup...");
621 schedule_work(&info
->tqueue_hangup
);
627 * This is the serial driver's interrupt routine
629 static irqreturn_t
rs_interrupt_single(int irq
, void *dev_id
,
630 struct pt_regs
*regs
)
632 struct esp_struct
* info
;
634 unsigned int scratch
;
636 #ifdef SERIAL_DEBUG_INTR
637 printk("rs_interrupt_single(%d)...", irq
);
639 info
= (struct esp_struct
*)dev_id
;
641 scratch
= serial_in(info
, UART_ESI_SID
);
643 spin_lock(&info
->lock
);
646 spin_unlock(&info
->lock
);
650 if (scratch
& 0x04) { /* error */
651 serial_out(info
, UART_ESI_CMD1
, ESI_GET_ERR_STAT
);
652 err_status
= serial_in(info
, UART_ESI_STAT1
);
653 serial_in(info
, UART_ESI_STAT2
);
655 if (err_status
& 0x01)
656 info
->stat_flags
|= ESP_STAT_RX_TIMEOUT
;
658 if (err_status
& 0x20) /* UART status */
659 check_modem_status(info
);
661 if (err_status
& 0x80) /* Start break */
662 wake_up_interruptible(&info
->break_wait
);
665 if ((scratch
& 0x88) || /* DMA completed or timed out */
666 (err_status
& 0x1c) /* receive error */) {
667 if (info
->stat_flags
& ESP_STAT_DMA_RX
)
668 receive_chars_dma_done(info
, err_status
);
669 else if (info
->stat_flags
& ESP_STAT_DMA_TX
)
670 transmit_chars_dma_done(info
);
673 if (!(info
->stat_flags
& (ESP_STAT_DMA_RX
| ESP_STAT_DMA_TX
)) &&
674 ((scratch
& 0x01) || (info
->stat_flags
& ESP_STAT_RX_TIMEOUT
)) &&
675 (info
->IER
& UART_IER_RDI
)) {
678 serial_out(info
, UART_ESI_CMD1
, ESI_NO_COMMAND
);
679 serial_out(info
, UART_ESI_CMD1
, ESI_GET_RX_AVAIL
);
680 num_bytes
= serial_in(info
, UART_ESI_STAT1
) << 8;
681 num_bytes
|= serial_in(info
, UART_ESI_STAT2
);
683 num_bytes
= tty_buffer_request_room(info
->tty
, num_bytes
);
687 (info
->stat_flags
& ESP_STAT_USE_PIO
) ||
688 (num_bytes
<= info
->config
.pio_threshold
))
689 receive_chars_pio(info
, num_bytes
);
691 receive_chars_dma(info
, num_bytes
);
695 if (!(info
->stat_flags
& (ESP_STAT_DMA_RX
| ESP_STAT_DMA_TX
)) &&
696 (scratch
& 0x02) && (info
->IER
& UART_IER_THRI
)) {
697 if ((info
->xmit_cnt
<= 0) || info
->tty
->stopped
) {
698 info
->IER
&= ~UART_IER_THRI
;
699 serial_out(info
, UART_ESI_CMD1
, ESI_SET_SRV_MASK
);
700 serial_out(info
, UART_ESI_CMD2
, info
->IER
);
704 serial_out(info
, UART_ESI_CMD1
, ESI_NO_COMMAND
);
705 serial_out(info
, UART_ESI_CMD1
, ESI_GET_TX_AVAIL
);
706 num_bytes
= serial_in(info
, UART_ESI_STAT1
) << 8;
707 num_bytes
|= serial_in(info
, UART_ESI_STAT2
);
709 if (num_bytes
> info
->xmit_cnt
)
710 num_bytes
= info
->xmit_cnt
;
714 (info
->stat_flags
& ESP_STAT_USE_PIO
) ||
715 (num_bytes
<= info
->config
.pio_threshold
))
716 transmit_chars_pio(info
, num_bytes
);
718 transmit_chars_dma(info
, num_bytes
);
723 info
->last_active
= jiffies
;
725 #ifdef SERIAL_DEBUG_INTR
728 spin_unlock(&info
->lock
);
733 * -------------------------------------------------------------------
734 * Here ends the serial interrupt routines.
735 * -------------------------------------------------------------------
738 static void do_softint(void *private_
)
740 struct esp_struct
*info
= (struct esp_struct
*) private_
;
741 struct tty_struct
*tty
;
747 if (test_and_clear_bit(ESP_EVENT_WRITE_WAKEUP
, &info
->event
)) {
753 * This routine is called from the scheduler tqueue when the interrupt
754 * routine has signalled that a hangup has occurred. The path of
755 * hangup processing is:
757 * serial interrupt routine -> (scheduler tqueue) ->
758 * do_serial_hangup() -> tty->hangup() -> esp_hangup()
761 static void do_serial_hangup(void *private_
)
763 struct esp_struct
*info
= (struct esp_struct
*) private_
;
764 struct tty_struct
*tty
;
772 * ---------------------------------------------------------------
773 * Low level utility subroutines for the serial driver: routines to
774 * figure out the appropriate timeout for an interrupt chain, routines
775 * to initialize and startup a serial port, and routines to shutdown a
776 * serial port. Useful stuff like that.
778 * Caller should hold lock
779 * ---------------------------------------------------------------
782 static inline void esp_basic_init(struct esp_struct
* info
)
784 /* put ESPC in enhanced mode */
785 serial_out(info
, UART_ESI_CMD1
, ESI_SET_MODE
);
787 if (info
->stat_flags
& ESP_STAT_NEVER_DMA
)
788 serial_out(info
, UART_ESI_CMD2
, 0x01);
790 serial_out(info
, UART_ESI_CMD2
, 0x31);
792 /* disable interrupts for now */
793 serial_out(info
, UART_ESI_CMD1
, ESI_SET_SRV_MASK
);
794 serial_out(info
, UART_ESI_CMD2
, 0x00);
796 /* set interrupt and DMA channel */
797 serial_out(info
, UART_ESI_CMD1
, ESI_SET_IRQ
);
799 if (info
->stat_flags
& ESP_STAT_NEVER_DMA
)
800 serial_out(info
, UART_ESI_CMD2
, 0x01);
802 serial_out(info
, UART_ESI_CMD2
, (dma
<< 4) | 0x01);
804 serial_out(info
, UART_ESI_CMD1
, ESI_SET_ENH_IRQ
);
806 if (info
->line
% 8) /* secondary port */
807 serial_out(info
, UART_ESI_CMD2
, 0x0d); /* shared */
808 else if (info
->irq
== 9)
809 serial_out(info
, UART_ESI_CMD2
, 0x02);
811 serial_out(info
, UART_ESI_CMD2
, info
->irq
);
813 /* set error status mask (check this) */
814 serial_out(info
, UART_ESI_CMD1
, ESI_SET_ERR_MASK
);
816 if (info
->stat_flags
& ESP_STAT_NEVER_DMA
)
817 serial_out(info
, UART_ESI_CMD2
, 0xa1);
819 serial_out(info
, UART_ESI_CMD2
, 0xbd);
821 serial_out(info
, UART_ESI_CMD2
, 0x00);
823 /* set DMA timeout */
824 serial_out(info
, UART_ESI_CMD1
, ESI_SET_DMA_TMOUT
);
825 serial_out(info
, UART_ESI_CMD2
, 0xff);
827 /* set FIFO trigger levels */
828 serial_out(info
, UART_ESI_CMD1
, ESI_SET_TRIGGER
);
829 serial_out(info
, UART_ESI_CMD2
, info
->config
.rx_trigger
>> 8);
830 serial_out(info
, UART_ESI_CMD2
, info
->config
.rx_trigger
);
831 serial_out(info
, UART_ESI_CMD2
, info
->config
.tx_trigger
>> 8);
832 serial_out(info
, UART_ESI_CMD2
, info
->config
.tx_trigger
);
834 /* Set clock scaling and wait states */
835 serial_out(info
, UART_ESI_CMD1
, ESI_SET_PRESCALAR
);
836 serial_out(info
, UART_ESI_CMD2
, 0x04 | ESPC_SCALE
);
838 /* set reinterrupt pacing */
839 serial_out(info
, UART_ESI_CMD1
, ESI_SET_REINTR
);
840 serial_out(info
, UART_ESI_CMD2
, 0xff);
843 static int startup(struct esp_struct
* info
)
847 unsigned int num_chars
;
849 spin_lock_irqsave(&info
->lock
, flags
);
851 if (info
->flags
& ASYNC_INITIALIZED
)
854 if (!info
->xmit_buf
) {
855 info
->xmit_buf
= (unsigned char *)get_zeroed_page(GFP_ATOMIC
);
861 #ifdef SERIAL_DEBUG_OPEN
862 printk("starting up ttys%d (irq %d)...", info
->line
, info
->irq
);
865 /* Flush the RX buffer. Using the ESI flush command may cause */
866 /* wild interrupts, so read all the data instead. */
868 serial_out(info
, UART_ESI_CMD1
, ESI_NO_COMMAND
);
869 serial_out(info
, UART_ESI_CMD1
, ESI_GET_RX_AVAIL
);
870 num_chars
= serial_in(info
, UART_ESI_STAT1
) << 8;
871 num_chars
|= serial_in(info
, UART_ESI_STAT2
);
873 while (num_chars
> 1) {
874 inw(info
->port
+ UART_ESI_RX
);
879 serial_in(info
, UART_ESI_RX
);
881 /* set receive character timeout */
882 serial_out(info
, UART_ESI_CMD1
, ESI_SET_RX_TIMEOUT
);
883 serial_out(info
, UART_ESI_CMD2
, info
->config
.rx_timeout
);
885 /* clear all flags except the "never DMA" flag */
886 info
->stat_flags
&= ESP_STAT_NEVER_DMA
;
888 if (info
->stat_flags
& ESP_STAT_NEVER_DMA
)
889 info
->stat_flags
|= ESP_STAT_USE_PIO
;
891 spin_unlock_irqrestore(&info
->lock
, flags
);
897 retval
= request_irq(info
->irq
, rs_interrupt_single
, SA_SHIRQ
,
901 if (capable(CAP_SYS_ADMIN
)) {
903 set_bit(TTY_IO_ERROR
,
910 if (!(info
->stat_flags
& ESP_STAT_USE_PIO
) && !dma_buffer
) {
911 dma_buffer
= (char *)__get_dma_pages(
912 GFP_KERNEL
, get_order(DMA_BUFFER_SZ
));
914 /* use PIO mode if DMA buf/chan cannot be allocated */
916 info
->stat_flags
|= ESP_STAT_USE_PIO
;
917 else if (request_dma(dma
, "esp serial")) {
918 free_pages((unsigned long)dma_buffer
,
919 get_order(DMA_BUFFER_SZ
));
921 info
->stat_flags
|= ESP_STAT_USE_PIO
;
926 info
->MCR
= UART_MCR_DTR
| UART_MCR_RTS
| UART_MCR_OUT2
;
928 spin_lock_irqsave(&info
->lock
, flags
);
929 serial_out(info
, UART_ESI_CMD1
, ESI_WRITE_UART
);
930 serial_out(info
, UART_ESI_CMD2
, UART_MCR
);
931 serial_out(info
, UART_ESI_CMD2
, info
->MCR
);
934 * Finally, enable interrupts
936 /* info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI; */
937 info
->IER
= UART_IER_RLSI
| UART_IER_RDI
| UART_IER_DMA_TMOUT
|
939 serial_out(info
, UART_ESI_CMD1
, ESI_SET_SRV_MASK
);
940 serial_out(info
, UART_ESI_CMD2
, info
->IER
);
943 clear_bit(TTY_IO_ERROR
, &info
->tty
->flags
);
944 info
->xmit_cnt
= info
->xmit_head
= info
->xmit_tail
= 0;
945 spin_unlock_irqrestore(&info
->lock
, flags
);
948 * Set up the tty->alt_speed kludge
951 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_HI
)
952 info
->tty
->alt_speed
= 57600;
953 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_VHI
)
954 info
->tty
->alt_speed
= 115200;
955 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_SHI
)
956 info
->tty
->alt_speed
= 230400;
957 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_WARP
)
958 info
->tty
->alt_speed
= 460800;
962 * set the speed of the serial port
965 info
->flags
|= ASYNC_INITIALIZED
;
969 spin_unlock_irqrestore(&info
->lock
, flags
);
975 * This routine will shutdown a serial port; interrupts are disabled, and
976 * DTR is dropped if the hangup on close termio flag is on.
978 static void shutdown(struct esp_struct
* info
)
980 unsigned long flags
, f
;
982 if (!(info
->flags
& ASYNC_INITIALIZED
))
985 #ifdef SERIAL_DEBUG_OPEN
986 printk("Shutting down serial port %d (irq %d)....", info
->line
,
990 spin_lock_irqsave(&info
->lock
, flags
);
992 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
993 * here so the queue might never be waken up
995 wake_up_interruptible(&info
->delta_msr_wait
);
996 wake_up_interruptible(&info
->break_wait
);
998 /* stop a DMA transfer on the port being closed */
999 /* DMA lock is higher priority always */
1000 if (info
->stat_flags
& (ESP_STAT_DMA_RX
| ESP_STAT_DMA_TX
)) {
1004 release_dma_lock(f
);
1012 free_irq(info
->irq
, info
);
1015 struct esp_struct
*current_port
= ports
;
1017 while (current_port
) {
1018 if ((current_port
!= info
) &&
1019 (current_port
->flags
& ASYNC_INITIALIZED
))
1022 current_port
= current_port
->next_port
;
1025 if (!current_port
) {
1027 free_pages((unsigned long)dma_buffer
,
1028 get_order(DMA_BUFFER_SZ
));
1033 if (info
->xmit_buf
) {
1034 free_page((unsigned long) info
->xmit_buf
);
1035 info
->xmit_buf
= NULL
;
1039 serial_out(info
, UART_ESI_CMD1
, ESI_SET_SRV_MASK
);
1040 serial_out(info
, UART_ESI_CMD2
, 0x00);
1042 if (!info
->tty
|| (info
->tty
->termios
->c_cflag
& HUPCL
))
1043 info
->MCR
&= ~(UART_MCR_DTR
|UART_MCR_RTS
);
1045 info
->MCR
&= ~UART_MCR_OUT2
;
1046 serial_out(info
, UART_ESI_CMD1
, ESI_WRITE_UART
);
1047 serial_out(info
, UART_ESI_CMD2
, UART_MCR
);
1048 serial_out(info
, UART_ESI_CMD2
, info
->MCR
);
1051 set_bit(TTY_IO_ERROR
, &info
->tty
->flags
);
1053 info
->flags
&= ~ASYNC_INITIALIZED
;
1054 spin_unlock_irqrestore(&info
->lock
, flags
);
1058 * This routine is called to set the UART divisor registers to match
1059 * the specified baud rate for a serial port.
1061 static void change_speed(struct esp_struct
*info
)
1063 unsigned short port
;
1065 unsigned cflag
,cval
;
1067 unsigned char flow1
= 0, flow2
= 0;
1068 unsigned long flags
;
1070 if (!info
->tty
|| !info
->tty
->termios
)
1072 cflag
= info
->tty
->termios
->c_cflag
;
1075 /* byte size and parity */
1076 switch (cflag
& CSIZE
) {
1077 case CS5
: cval
= 0x00; bits
= 7; break;
1078 case CS6
: cval
= 0x01; bits
= 8; break;
1079 case CS7
: cval
= 0x02; bits
= 9; break;
1080 case CS8
: cval
= 0x03; bits
= 10; break;
1081 default: cval
= 0x00; bits
= 7; break;
1083 if (cflag
& CSTOPB
) {
1087 if (cflag
& PARENB
) {
1088 cval
|= UART_LCR_PARITY
;
1091 if (!(cflag
& PARODD
))
1092 cval
|= UART_LCR_EPAR
;
1095 cval
|= UART_LCR_SPAR
;
1098 baud
= tty_get_baud_rate(info
->tty
);
1099 if (baud
== 38400 &&
1100 ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_CUST
))
1101 quot
= info
->custom_divisor
;
1104 /* Special case since 134 is really 134.5 */
1105 quot
= (2*BASE_BAUD
/ 269);
1107 quot
= BASE_BAUD
/ baud
;
1109 /* If the quotient is ever zero, default to 9600 bps */
1111 quot
= BASE_BAUD
/ 9600;
1113 info
->timeout
= ((1024 * HZ
* bits
* quot
) / BASE_BAUD
) + (HZ
/ 50);
1115 /* CTS flow control flag and modem status interrupts */
1116 /* info->IER &= ~UART_IER_MSI; */
1117 if (cflag
& CRTSCTS
) {
1118 info
->flags
|= ASYNC_CTS_FLOW
;
1119 /* info->IER |= UART_IER_MSI; */
1123 info
->flags
&= ~ASYNC_CTS_FLOW
;
1125 info
->flags
&= ~ASYNC_CHECK_CD
;
1127 info
->flags
|= ASYNC_CHECK_CD
;
1128 /* info->IER |= UART_IER_MSI; */
1132 * Set up parity check flag
1134 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
1136 info
->read_status_mask
= UART_LSR_OE
| UART_LSR_THRE
| UART_LSR_DR
;
1137 if (I_INPCK(info
->tty
))
1138 info
->read_status_mask
|= UART_LSR_FE
| UART_LSR_PE
;
1139 if (I_BRKINT(info
->tty
) || I_PARMRK(info
->tty
))
1140 info
->read_status_mask
|= UART_LSR_BI
;
1142 info
->ignore_status_mask
= 0;
1144 /* This should be safe, but for some broken bits of hardware... */
1145 if (I_IGNPAR(info
->tty
)) {
1146 info
->ignore_status_mask
|= UART_LSR_PE
| UART_LSR_FE
;
1147 info
->read_status_mask
|= UART_LSR_PE
| UART_LSR_FE
;
1150 if (I_IGNBRK(info
->tty
)) {
1151 info
->ignore_status_mask
|= UART_LSR_BI
;
1152 info
->read_status_mask
|= UART_LSR_BI
;
1154 * If we're ignore parity and break indicators, ignore
1155 * overruns too. (For real raw support).
1157 if (I_IGNPAR(info
->tty
)) {
1158 info
->ignore_status_mask
|= UART_LSR_OE
| \
1159 UART_LSR_PE
| UART_LSR_FE
;
1160 info
->read_status_mask
|= UART_LSR_OE
| \
1161 UART_LSR_PE
| UART_LSR_FE
;
1165 if (I_IXOFF(info
->tty
))
1168 spin_lock_irqsave(&info
->lock
, flags
);
1170 serial_out(info
, UART_ESI_CMD1
, ESI_SET_BAUD
);
1171 serial_out(info
, UART_ESI_CMD2
, quot
>> 8);
1172 serial_out(info
, UART_ESI_CMD2
, quot
& 0xff);
1174 /* set data bits, parity, etc. */
1175 serial_out(info
, UART_ESI_CMD1
, ESI_WRITE_UART
);
1176 serial_out(info
, UART_ESI_CMD2
, UART_LCR
);
1177 serial_out(info
, UART_ESI_CMD2
, cval
);
1179 /* Enable flow control */
1180 serial_out(info
, UART_ESI_CMD1
, ESI_SET_FLOW_CNTL
);
1181 serial_out(info
, UART_ESI_CMD2
, flow1
);
1182 serial_out(info
, UART_ESI_CMD2
, flow2
);
1184 /* set flow control characters (XON/XOFF only) */
1185 if (I_IXOFF(info
->tty
)) {
1186 serial_out(info
, UART_ESI_CMD1
, ESI_SET_FLOW_CHARS
);
1187 serial_out(info
, UART_ESI_CMD2
, START_CHAR(info
->tty
));
1188 serial_out(info
, UART_ESI_CMD2
, STOP_CHAR(info
->tty
));
1189 serial_out(info
, UART_ESI_CMD2
, 0x10);
1190 serial_out(info
, UART_ESI_CMD2
, 0x21);
1191 switch (cflag
& CSIZE
) {
1193 serial_out(info
, UART_ESI_CMD2
, 0x1f);
1196 serial_out(info
, UART_ESI_CMD2
, 0x3f);
1200 serial_out(info
, UART_ESI_CMD2
, 0x7f);
1203 serial_out(info
, UART_ESI_CMD2
, 0xff);
1208 /* Set high/low water */
1209 serial_out(info
, UART_ESI_CMD1
, ESI_SET_FLOW_LVL
);
1210 serial_out(info
, UART_ESI_CMD2
, info
->config
.flow_off
>> 8);
1211 serial_out(info
, UART_ESI_CMD2
, info
->config
.flow_off
);
1212 serial_out(info
, UART_ESI_CMD2
, info
->config
.flow_on
>> 8);
1213 serial_out(info
, UART_ESI_CMD2
, info
->config
.flow_on
);
1215 spin_unlock_irqrestore(&info
->lock
, flags
);
1218 static void rs_put_char(struct tty_struct
*tty
, unsigned char ch
)
1220 struct esp_struct
*info
= (struct esp_struct
*)tty
->driver_data
;
1221 unsigned long flags
;
1223 if (serial_paranoia_check(info
, tty
->name
, "rs_put_char"))
1226 if (!tty
|| !info
->xmit_buf
)
1229 spin_lock_irqsave(&info
->lock
, flags
);
1230 if (info
->xmit_cnt
< ESP_XMIT_SIZE
- 1) {
1231 info
->xmit_buf
[info
->xmit_head
++] = ch
;
1232 info
->xmit_head
&= ESP_XMIT_SIZE
-1;
1235 spin_unlock_irqrestore(&info
->lock
, flags
);
1238 static void rs_flush_chars(struct tty_struct
*tty
)
1240 struct esp_struct
*info
= (struct esp_struct
*)tty
->driver_data
;
1241 unsigned long flags
;
1243 if (serial_paranoia_check(info
, tty
->name
, "rs_flush_chars"))
1246 spin_lock_irqsave(&info
->lock
, flags
);
1248 if (info
->xmit_cnt
<= 0 || tty
->stopped
|| !info
->xmit_buf
)
1251 if (!(info
->IER
& UART_IER_THRI
)) {
1252 info
->IER
|= UART_IER_THRI
;
1253 serial_out(info
, UART_ESI_CMD1
, ESI_SET_SRV_MASK
);
1254 serial_out(info
, UART_ESI_CMD2
, info
->IER
);
1257 spin_unlock_irqrestore(&info
->lock
, flags
);
1260 static int rs_write(struct tty_struct
* tty
,
1261 const unsigned char *buf
, int count
)
1264 struct esp_struct
*info
= (struct esp_struct
*)tty
->driver_data
;
1265 unsigned long flags
;
1267 if (serial_paranoia_check(info
, tty
->name
, "rs_write"))
1270 if (!tty
|| !info
->xmit_buf
|| !tmp_buf
)
1274 /* Thanks to R. Wolff for suggesting how to do this with */
1275 /* interrupts enabled */
1278 t
= ESP_XMIT_SIZE
- info
->xmit_cnt
- 1;
1283 t
= ESP_XMIT_SIZE
- info
->xmit_head
;
1291 memcpy(info
->xmit_buf
+ info
->xmit_head
, buf
, c
);
1293 info
->xmit_head
= (info
->xmit_head
+ c
) & (ESP_XMIT_SIZE
-1);
1294 info
->xmit_cnt
+= c
;
1300 spin_lock_irqsave(&info
->lock
, flags
);
1302 if (info
->xmit_cnt
&& !tty
->stopped
&& !(info
->IER
& UART_IER_THRI
)) {
1303 info
->IER
|= UART_IER_THRI
;
1304 serial_out(info
, UART_ESI_CMD1
, ESI_SET_SRV_MASK
);
1305 serial_out(info
, UART_ESI_CMD2
, info
->IER
);
1308 spin_unlock_irqrestore(&info
->lock
, flags
);
1312 static int rs_write_room(struct tty_struct
*tty
)
1314 struct esp_struct
*info
= (struct esp_struct
*)tty
->driver_data
;
1316 unsigned long flags
;
1318 if (serial_paranoia_check(info
, tty
->name
, "rs_write_room"))
1321 spin_lock_irqsave(&info
->lock
, flags
);
1323 ret
= ESP_XMIT_SIZE
- info
->xmit_cnt
- 1;
1326 spin_unlock_irqrestore(&info
->lock
, flags
);
1330 static int rs_chars_in_buffer(struct tty_struct
*tty
)
1332 struct esp_struct
*info
= (struct esp_struct
*)tty
->driver_data
;
1334 if (serial_paranoia_check(info
, tty
->name
, "rs_chars_in_buffer"))
1336 return info
->xmit_cnt
;
1339 static void rs_flush_buffer(struct tty_struct
*tty
)
1341 struct esp_struct
*info
= (struct esp_struct
*)tty
->driver_data
;
1342 unsigned long flags
;
1344 if (serial_paranoia_check(info
, tty
->name
, "rs_flush_buffer"))
1346 spin_lock_irqsave(&info
->lock
, flags
);
1347 info
->xmit_cnt
= info
->xmit_head
= info
->xmit_tail
= 0;
1348 spin_unlock_irqrestore(&info
->lock
, flags
);
1353 * ------------------------------------------------------------
1356 * This routine is called by the upper-layer tty layer to signal that
1357 * incoming characters should be throttled.
1358 * ------------------------------------------------------------
1360 static void rs_throttle(struct tty_struct
* tty
)
1362 struct esp_struct
*info
= (struct esp_struct
*)tty
->driver_data
;
1363 unsigned long flags
;
1364 #ifdef SERIAL_DEBUG_THROTTLE
1367 printk("throttle %s: %d....\n", tty_name(tty
, buf
),
1368 tty
->ldisc
.chars_in_buffer(tty
));
1371 if (serial_paranoia_check(info
, tty
->name
, "rs_throttle"))
1374 spin_lock_irqsave(&info
->lock
, flags
);
1375 info
->IER
&= ~UART_IER_RDI
;
1376 serial_out(info
, UART_ESI_CMD1
, ESI_SET_SRV_MASK
);
1377 serial_out(info
, UART_ESI_CMD2
, info
->IER
);
1378 serial_out(info
, UART_ESI_CMD1
, ESI_SET_RX_TIMEOUT
);
1379 serial_out(info
, UART_ESI_CMD2
, 0x00);
1380 spin_unlock_irqrestore(&info
->lock
, flags
);
1383 static void rs_unthrottle(struct tty_struct
* tty
)
1385 struct esp_struct
*info
= (struct esp_struct
*)tty
->driver_data
;
1386 unsigned long flags
;
1387 #ifdef SERIAL_DEBUG_THROTTLE
1390 printk("unthrottle %s: %d....\n", tty_name(tty
, buf
),
1391 tty
->ldisc
.chars_in_buffer(tty
));
1394 if (serial_paranoia_check(info
, tty
->name
, "rs_unthrottle"))
1397 spin_lock_irqsave(&info
->lock
, flags
);
1398 info
->IER
|= UART_IER_RDI
;
1399 serial_out(info
, UART_ESI_CMD1
, ESI_SET_SRV_MASK
);
1400 serial_out(info
, UART_ESI_CMD2
, info
->IER
);
1401 serial_out(info
, UART_ESI_CMD1
, ESI_SET_RX_TIMEOUT
);
1402 serial_out(info
, UART_ESI_CMD2
, info
->config
.rx_timeout
);
1403 spin_unlock_irqrestore(&info
->lock
, flags
);
1407 * ------------------------------------------------------------
1408 * rs_ioctl() and friends
1409 * ------------------------------------------------------------
1412 static int get_serial_info(struct esp_struct
* info
,
1413 struct serial_struct __user
*retinfo
)
1415 struct serial_struct tmp
;
1417 memset(&tmp
, 0, sizeof(tmp
));
1418 tmp
.type
= PORT_16550A
;
1419 tmp
.line
= info
->line
;
1420 tmp
.port
= info
->port
;
1421 tmp
.irq
= info
->irq
;
1422 tmp
.flags
= info
->flags
;
1423 tmp
.xmit_fifo_size
= 1024;
1424 tmp
.baud_base
= BASE_BAUD
;
1425 tmp
.close_delay
= info
->close_delay
;
1426 tmp
.closing_wait
= info
->closing_wait
;
1427 tmp
.custom_divisor
= info
->custom_divisor
;
1429 if (copy_to_user(retinfo
,&tmp
,sizeof(*retinfo
)))
1434 static int get_esp_config(struct esp_struct
* info
,
1435 struct hayes_esp_config __user
*retinfo
)
1437 struct hayes_esp_config tmp
;
1442 memset(&tmp
, 0, sizeof(tmp
));
1443 tmp
.rx_timeout
= info
->config
.rx_timeout
;
1444 tmp
.rx_trigger
= info
->config
.rx_trigger
;
1445 tmp
.tx_trigger
= info
->config
.tx_trigger
;
1446 tmp
.flow_off
= info
->config
.flow_off
;
1447 tmp
.flow_on
= info
->config
.flow_on
;
1448 tmp
.pio_threshold
= info
->config
.pio_threshold
;
1449 tmp
.dma_channel
= (info
->stat_flags
& ESP_STAT_NEVER_DMA
? 0 : dma
);
1451 return copy_to_user(retinfo
, &tmp
, sizeof(*retinfo
)) ? -EFAULT
: 0;
1454 static int set_serial_info(struct esp_struct
* info
,
1455 struct serial_struct __user
*new_info
)
1457 struct serial_struct new_serial
;
1458 struct esp_struct old_info
;
1459 unsigned int change_irq
;
1461 struct esp_struct
*current_async
;
1463 if (copy_from_user(&new_serial
,new_info
,sizeof(new_serial
)))
1467 if ((new_serial
.type
!= PORT_16550A
) ||
1468 (new_serial
.hub6
) ||
1469 (info
->port
!= new_serial
.port
) ||
1470 (new_serial
.baud_base
!= BASE_BAUD
) ||
1471 (new_serial
.irq
> 15) ||
1472 (new_serial
.irq
< 2) ||
1473 (new_serial
.irq
== 6) ||
1474 (new_serial
.irq
== 8) ||
1475 (new_serial
.irq
== 13))
1478 change_irq
= new_serial
.irq
!= info
->irq
;
1480 if (change_irq
&& (info
->line
% 8))
1483 if (!capable(CAP_SYS_ADMIN
)) {
1485 (new_serial
.close_delay
!= info
->close_delay
) ||
1486 ((new_serial
.flags
& ~ASYNC_USR_MASK
) !=
1487 (info
->flags
& ~ASYNC_USR_MASK
)))
1489 info
->flags
= ((info
->flags
& ~ASYNC_USR_MASK
) |
1490 (new_serial
.flags
& ASYNC_USR_MASK
));
1491 info
->custom_divisor
= new_serial
.custom_divisor
;
1493 if (new_serial
.irq
== 2)
1497 current_async
= ports
;
1499 while (current_async
) {
1500 if ((current_async
->line
>= info
->line
) &&
1501 (current_async
->line
< (info
->line
+ 8))) {
1502 if (current_async
== info
) {
1503 if (current_async
->count
> 1)
1505 } else if (current_async
->count
)
1509 current_async
= current_async
->next_port
;
1514 * OK, past this point, all the error checking has been done.
1515 * At this point, we start making changes.....
1518 info
->flags
= ((info
->flags
& ~ASYNC_FLAGS
) |
1519 (new_serial
.flags
& ASYNC_FLAGS
));
1520 info
->custom_divisor
= new_serial
.custom_divisor
;
1521 info
->close_delay
= new_serial
.close_delay
* HZ
/100;
1522 info
->closing_wait
= new_serial
.closing_wait
* HZ
/100;
1526 * We need to shutdown the serial port at the old
1527 * port/irq combination.
1531 current_async
= ports
;
1533 while (current_async
) {
1534 if ((current_async
->line
>= info
->line
) &&
1535 (current_async
->line
< (info
->line
+ 8)))
1536 current_async
->irq
= new_serial
.irq
;
1538 current_async
= current_async
->next_port
;
1541 serial_out(info
, UART_ESI_CMD1
, ESI_SET_ENH_IRQ
);
1543 serial_out(info
, UART_ESI_CMD2
, 0x02);
1545 serial_out(info
, UART_ESI_CMD2
, info
->irq
);
1549 if (info
->flags
& ASYNC_INITIALIZED
) {
1550 if (((old_info
.flags
& ASYNC_SPD_MASK
) !=
1551 (info
->flags
& ASYNC_SPD_MASK
)) ||
1552 (old_info
.custom_divisor
!= info
->custom_divisor
)) {
1553 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_HI
)
1554 info
->tty
->alt_speed
= 57600;
1555 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_VHI
)
1556 info
->tty
->alt_speed
= 115200;
1557 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_SHI
)
1558 info
->tty
->alt_speed
= 230400;
1559 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_WARP
)
1560 info
->tty
->alt_speed
= 460800;
1564 retval
= startup(info
);
1569 static int set_esp_config(struct esp_struct
* info
,
1570 struct hayes_esp_config __user
* new_info
)
1572 struct hayes_esp_config new_config
;
1573 unsigned int change_dma
;
1575 struct esp_struct
*current_async
;
1576 unsigned long flags
;
1578 /* Perhaps a non-sysadmin user should be able to do some of these */
1579 /* operations. I haven't decided yet. */
1581 if (!capable(CAP_SYS_ADMIN
))
1584 if (copy_from_user(&new_config
, new_info
, sizeof(new_config
)))
1587 if ((new_config
.flow_on
>= new_config
.flow_off
) ||
1588 (new_config
.rx_trigger
< 1) ||
1589 (new_config
.tx_trigger
< 1) ||
1590 (new_config
.flow_off
< 1) ||
1591 (new_config
.flow_on
< 1) ||
1592 (new_config
.rx_trigger
> 1023) ||
1593 (new_config
.tx_trigger
> 1023) ||
1594 (new_config
.flow_off
> 1023) ||
1595 (new_config
.flow_on
> 1023) ||
1596 (new_config
.pio_threshold
< 0) ||
1597 (new_config
.pio_threshold
> 1024))
1600 if ((new_config
.dma_channel
!= 1) && (new_config
.dma_channel
!= 3))
1601 new_config
.dma_channel
= 0;
1603 if (info
->stat_flags
& ESP_STAT_NEVER_DMA
)
1604 change_dma
= new_config
.dma_channel
;
1606 change_dma
= (new_config
.dma_channel
!= dma
);
1609 if (new_config
.dma_channel
) {
1610 /* PIO mode to DMA mode transition OR */
1611 /* change current DMA channel */
1613 current_async
= ports
;
1615 while (current_async
) {
1616 if (current_async
== info
) {
1617 if (current_async
->count
> 1)
1619 } else if (current_async
->count
)
1623 current_async
->next_port
;
1627 dma
= new_config
.dma_channel
;
1628 info
->stat_flags
&= ~ESP_STAT_NEVER_DMA
;
1630 /* all ports must use the same DMA channel */
1632 spin_lock_irqsave(&info
->lock
, flags
);
1633 current_async
= ports
;
1635 while (current_async
) {
1636 esp_basic_init(current_async
);
1637 current_async
= current_async
->next_port
;
1639 spin_unlock_irqrestore(&info
->lock
, flags
);
1641 /* DMA mode to PIO mode only */
1643 if (info
->count
> 1)
1647 spin_lock_irqsave(&info
->lock
, flags
);
1648 info
->stat_flags
|= ESP_STAT_NEVER_DMA
;
1649 esp_basic_init(info
);
1650 spin_unlock_irqrestore(&info
->lock
, flags
);
1654 info
->config
.pio_threshold
= new_config
.pio_threshold
;
1656 if ((new_config
.flow_off
!= info
->config
.flow_off
) ||
1657 (new_config
.flow_on
!= info
->config
.flow_on
)) {
1658 unsigned long flags
;
1660 info
->config
.flow_off
= new_config
.flow_off
;
1661 info
->config
.flow_on
= new_config
.flow_on
;
1663 spin_lock_irqsave(&info
->lock
, flags
);
1664 serial_out(info
, UART_ESI_CMD1
, ESI_SET_FLOW_LVL
);
1665 serial_out(info
, UART_ESI_CMD2
, new_config
.flow_off
>> 8);
1666 serial_out(info
, UART_ESI_CMD2
, new_config
.flow_off
);
1667 serial_out(info
, UART_ESI_CMD2
, new_config
.flow_on
>> 8);
1668 serial_out(info
, UART_ESI_CMD2
, new_config
.flow_on
);
1669 spin_unlock_irqrestore(&info
->lock
, flags
);
1672 if ((new_config
.rx_trigger
!= info
->config
.rx_trigger
) ||
1673 (new_config
.tx_trigger
!= info
->config
.tx_trigger
)) {
1674 unsigned long flags
;
1676 info
->config
.rx_trigger
= new_config
.rx_trigger
;
1677 info
->config
.tx_trigger
= new_config
.tx_trigger
;
1678 spin_lock_irqsave(&info
->lock
, flags
);
1679 serial_out(info
, UART_ESI_CMD1
, ESI_SET_TRIGGER
);
1680 serial_out(info
, UART_ESI_CMD2
,
1681 new_config
.rx_trigger
>> 8);
1682 serial_out(info
, UART_ESI_CMD2
, new_config
.rx_trigger
);
1683 serial_out(info
, UART_ESI_CMD2
,
1684 new_config
.tx_trigger
>> 8);
1685 serial_out(info
, UART_ESI_CMD2
, new_config
.tx_trigger
);
1686 spin_unlock_irqrestore(&info
->lock
, flags
);
1689 if (new_config
.rx_timeout
!= info
->config
.rx_timeout
) {
1690 unsigned long flags
;
1692 info
->config
.rx_timeout
= new_config
.rx_timeout
;
1693 spin_lock_irqsave(&info
->lock
, flags
);
1695 if (info
->IER
& UART_IER_RDI
) {
1696 serial_out(info
, UART_ESI_CMD1
,
1697 ESI_SET_RX_TIMEOUT
);
1698 serial_out(info
, UART_ESI_CMD2
,
1699 new_config
.rx_timeout
);
1702 spin_unlock_irqrestore(&info
->lock
, flags
);
1705 if (!(info
->flags
& ASYNC_INITIALIZED
))
1706 retval
= startup(info
);
1712 * get_lsr_info - get line status register info
1714 * Purpose: Let user call ioctl() to get info when the UART physically
1715 * is emptied. On bus types like RS485, the transmitter must
1716 * release the bus after transmitting. This must be done when
1717 * the transmit shift register is empty, not be done when the
1718 * transmit holding register is empty. This functionality
1719 * allows an RS485 driver to be written in user space.
1721 static int get_lsr_info(struct esp_struct
* info
, unsigned int __user
*value
)
1723 unsigned char status
;
1724 unsigned int result
;
1725 unsigned long flags
;
1727 spin_lock_irqsave(&info
->lock
, flags
);
1728 serial_out(info
, UART_ESI_CMD1
, ESI_GET_UART_STAT
);
1729 status
= serial_in(info
, UART_ESI_STAT1
);
1730 spin_unlock_irqrestore(&info
->lock
, flags
);
1731 result
= ((status
& UART_LSR_TEMT
) ? TIOCSER_TEMT
: 0);
1732 return put_user(result
,value
);
1736 static int esp_tiocmget(struct tty_struct
*tty
, struct file
*file
)
1738 struct esp_struct
* info
= (struct esp_struct
*)tty
->driver_data
;
1739 unsigned char control
, status
;
1740 unsigned long flags
;
1742 if (serial_paranoia_check(info
, tty
->name
, __FUNCTION__
))
1744 if (tty
->flags
& (1 << TTY_IO_ERROR
))
1747 control
= info
->MCR
;
1749 spin_lock_irqsave(&info
->lock
, flags
);
1750 serial_out(info
, UART_ESI_CMD1
, ESI_GET_UART_STAT
);
1751 status
= serial_in(info
, UART_ESI_STAT2
);
1752 spin_unlock_irqrestore(&info
->lock
, flags
);
1754 return ((control
& UART_MCR_RTS
) ? TIOCM_RTS
: 0)
1755 | ((control
& UART_MCR_DTR
) ? TIOCM_DTR
: 0)
1756 | ((status
& UART_MSR_DCD
) ? TIOCM_CAR
: 0)
1757 | ((status
& UART_MSR_RI
) ? TIOCM_RNG
: 0)
1758 | ((status
& UART_MSR_DSR
) ? TIOCM_DSR
: 0)
1759 | ((status
& UART_MSR_CTS
) ? TIOCM_CTS
: 0);
1762 static int esp_tiocmset(struct tty_struct
*tty
, struct file
*file
,
1763 unsigned int set
, unsigned int clear
)
1765 struct esp_struct
* info
= (struct esp_struct
*)tty
->driver_data
;
1766 unsigned long flags
;
1768 if (serial_paranoia_check(info
, tty
->name
, __FUNCTION__
))
1770 if (tty
->flags
& (1 << TTY_IO_ERROR
))
1773 spin_lock_irqsave(&info
->lock
, flags
);
1775 if (set
& TIOCM_RTS
)
1776 info
->MCR
|= UART_MCR_RTS
;
1777 if (set
& TIOCM_DTR
)
1778 info
->MCR
|= UART_MCR_DTR
;
1780 if (clear
& TIOCM_RTS
)
1781 info
->MCR
&= ~UART_MCR_RTS
;
1782 if (clear
& TIOCM_DTR
)
1783 info
->MCR
&= ~UART_MCR_DTR
;
1785 serial_out(info
, UART_ESI_CMD1
, ESI_WRITE_UART
);
1786 serial_out(info
, UART_ESI_CMD2
, UART_MCR
);
1787 serial_out(info
, UART_ESI_CMD2
, info
->MCR
);
1789 spin_unlock_irqrestore(&info
->lock
, flags
);
1794 * rs_break() --- routine which turns the break handling on or off
1796 static void esp_break(struct tty_struct
*tty
, int break_state
)
1798 struct esp_struct
* info
= (struct esp_struct
*)tty
->driver_data
;
1799 unsigned long flags
;
1801 if (serial_paranoia_check(info
, tty
->name
, "esp_break"))
1804 if (break_state
== -1) {
1805 spin_lock_irqsave(&info
->lock
, flags
);
1806 serial_out(info
, UART_ESI_CMD1
, ESI_ISSUE_BREAK
);
1807 serial_out(info
, UART_ESI_CMD2
, 0x01);
1808 spin_unlock_irqrestore(&info
->lock
, flags
);
1810 /* FIXME - new style wait needed here */
1811 interruptible_sleep_on(&info
->break_wait
);
1813 spin_lock_irqsave(&info
->lock
, flags
);
1814 serial_out(info
, UART_ESI_CMD1
, ESI_ISSUE_BREAK
);
1815 serial_out(info
, UART_ESI_CMD2
, 0x00);
1816 spin_unlock_irqrestore(&info
->lock
, flags
);
1820 static int rs_ioctl(struct tty_struct
*tty
, struct file
* file
,
1821 unsigned int cmd
, unsigned long arg
)
1823 struct esp_struct
* info
= (struct esp_struct
*)tty
->driver_data
;
1824 struct async_icount cprev
, cnow
; /* kernel counter temps */
1825 struct serial_icounter_struct __user
*p_cuser
; /* user space */
1826 void __user
*argp
= (void __user
*)arg
;
1827 unsigned long flags
;
1829 if (serial_paranoia_check(info
, tty
->name
, "rs_ioctl"))
1832 if ((cmd
!= TIOCGSERIAL
) && (cmd
!= TIOCSSERIAL
) &&
1833 (cmd
!= TIOCSERCONFIG
) && (cmd
!= TIOCSERGWILD
) &&
1834 (cmd
!= TIOCSERSWILD
) && (cmd
!= TIOCSERGSTRUCT
) &&
1835 (cmd
!= TIOCMIWAIT
) && (cmd
!= TIOCGICOUNT
) &&
1836 (cmd
!= TIOCGHAYESESP
) && (cmd
!= TIOCSHAYESESP
)) {
1837 if (tty
->flags
& (1 << TTY_IO_ERROR
))
1843 return get_serial_info(info
, argp
);
1845 return set_serial_info(info
, argp
);
1847 /* do not reconfigure after initial configuration */
1851 return put_user(0L, (unsigned long __user
*)argp
);
1853 case TIOCSERGETLSR
: /* Get line status register */
1854 return get_lsr_info(info
, argp
);
1857 if (!capable(CAP_SYS_ADMIN
))
1862 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1863 * - mask passed in arg for lines of interest
1864 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1865 * Caller should use TIOCGICOUNT to see which one it was
1868 spin_lock_irqsave(&info
->lock
, flags
);
1869 cprev
= info
->icount
; /* note the counters on entry */
1870 spin_unlock_irqrestore(&info
->lock
, flags
);
1872 /* FIXME: convert to new style wakeup */
1873 interruptible_sleep_on(&info
->delta_msr_wait
);
1874 /* see if a signal did it */
1875 if (signal_pending(current
))
1876 return -ERESTARTSYS
;
1877 spin_lock_irqsave(&info
->lock
, flags
);
1878 cnow
= info
->icount
; /* atomic copy */
1879 spin_unlock_irqrestore(&info
->lock
, flags
);
1880 if (cnow
.rng
== cprev
.rng
&&
1881 cnow
.dsr
== cprev
.dsr
&&
1882 cnow
.dcd
== cprev
.dcd
&&
1883 cnow
.cts
== cprev
.cts
)
1884 return -EIO
; /* no change => error */
1885 if (((arg
& TIOCM_RNG
) &&
1886 (cnow
.rng
!= cprev
.rng
)) ||
1887 ((arg
& TIOCM_DSR
) &&
1888 (cnow
.dsr
!= cprev
.dsr
)) ||
1889 ((arg
& TIOCM_CD
) &&
1890 (cnow
.dcd
!= cprev
.dcd
)) ||
1891 ((arg
& TIOCM_CTS
) &&
1892 (cnow
.cts
!= cprev
.cts
)) ) {
1900 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1901 * Return: write counters to the user passed counter struct
1902 * NB: both 1->0 and 0->1 transitions are counted except for
1903 * RI where only 0->1 is counted.
1906 spin_lock_irqsave(&info
->lock
, flags
);
1907 cnow
= info
->icount
;
1908 spin_unlock_irqrestore(&info
->lock
, flags
);
1910 if (put_user(cnow
.cts
, &p_cuser
->cts
) ||
1911 put_user(cnow
.dsr
, &p_cuser
->dsr
) ||
1912 put_user(cnow
.rng
, &p_cuser
->rng
) ||
1913 put_user(cnow
.dcd
, &p_cuser
->dcd
))
1918 return get_esp_config(info
, argp
);
1920 return set_esp_config(info
, argp
);
1923 return -ENOIOCTLCMD
;
1928 static void rs_set_termios(struct tty_struct
*tty
, struct termios
*old_termios
)
1930 struct esp_struct
*info
= (struct esp_struct
*)tty
->driver_data
;
1931 unsigned long flags
;
1933 if ( (tty
->termios
->c_cflag
== old_termios
->c_cflag
)
1934 && ( RELEVANT_IFLAG(tty
->termios
->c_iflag
)
1935 == RELEVANT_IFLAG(old_termios
->c_iflag
)))
1940 spin_lock_irqsave(&info
->lock
, flags
);
1942 /* Handle transition to B0 status */
1943 if ((old_termios
->c_cflag
& CBAUD
) &&
1944 !(tty
->termios
->c_cflag
& CBAUD
)) {
1945 info
->MCR
&= ~(UART_MCR_DTR
|UART_MCR_RTS
);
1946 serial_out(info
, UART_ESI_CMD1
, ESI_WRITE_UART
);
1947 serial_out(info
, UART_ESI_CMD2
, UART_MCR
);
1948 serial_out(info
, UART_ESI_CMD2
, info
->MCR
);
1951 /* Handle transition away from B0 status */
1952 if (!(old_termios
->c_cflag
& CBAUD
) &&
1953 (tty
->termios
->c_cflag
& CBAUD
)) {
1954 info
->MCR
|= (UART_MCR_DTR
| UART_MCR_RTS
);
1955 serial_out(info
, UART_ESI_CMD1
, ESI_WRITE_UART
);
1956 serial_out(info
, UART_ESI_CMD2
, UART_MCR
);
1957 serial_out(info
, UART_ESI_CMD2
, info
->MCR
);
1960 spin_unlock_irqrestore(&info
->lock
, flags
);
1962 /* Handle turning of CRTSCTS */
1963 if ((old_termios
->c_cflag
& CRTSCTS
) &&
1964 !(tty
->termios
->c_cflag
& CRTSCTS
)) {
1970 * ------------------------------------------------------------
1973 * This routine is called when the serial port gets closed. First, we
1974 * wait for the last remaining data to be sent. Then, we unlink its
1975 * async structure from the interrupt chain if necessary, and we free
1976 * that IRQ if nothing is left in the chain.
1977 * ------------------------------------------------------------
1979 static void rs_close(struct tty_struct
*tty
, struct file
* filp
)
1981 struct esp_struct
* info
= (struct esp_struct
*)tty
->driver_data
;
1982 unsigned long flags
;
1984 if (!info
|| serial_paranoia_check(info
, tty
->name
, "rs_close"))
1987 spin_lock_irqsave(&info
->lock
, flags
);
1989 if (tty_hung_up_p(filp
)) {
1990 DBG_CNT("before DEC-hung");
1994 #ifdef SERIAL_DEBUG_OPEN
1995 printk("rs_close ttys%d, count = %d\n", info
->line
, info
->count
);
1997 if ((tty
->count
== 1) && (info
->count
!= 1)) {
1999 * Uh, oh. tty->count is 1, which means that the tty
2000 * structure will be freed. Info->count should always
2001 * be one in these conditions. If it's greater than
2002 * one, we've got real problems, since it means the
2003 * serial port won't be shutdown.
2005 printk("rs_close: bad serial port count; tty->count is 1, "
2006 "info->count is %d\n", info
->count
);
2009 if (--info
->count
< 0) {
2010 printk("rs_close: bad serial port count for ttys%d: %d\n",
2011 info
->line
, info
->count
);
2015 DBG_CNT("before DEC-2");
2018 info
->flags
|= ASYNC_CLOSING
;
2020 spin_unlock_irqrestore(&info
->lock
, flags
);
2022 * Now we wait for the transmit buffer to clear; and we notify
2023 * the line discipline to only process XON/XOFF characters.
2026 if (info
->closing_wait
!= ASYNC_CLOSING_WAIT_NONE
)
2027 tty_wait_until_sent(tty
, info
->closing_wait
);
2029 * At this point we stop accepting input. To do this, we
2030 * disable the receive line status interrupts, and tell the
2031 * interrupt driver to stop checking the data ready bit in the
2032 * line status register.
2034 /* info->IER &= ~UART_IER_RLSI; */
2035 info
->IER
&= ~UART_IER_RDI
;
2036 info
->read_status_mask
&= ~UART_LSR_DR
;
2037 if (info
->flags
& ASYNC_INITIALIZED
) {
2039 spin_lock_irqsave(&info
->lock
, flags
);
2040 serial_out(info
, UART_ESI_CMD1
, ESI_SET_SRV_MASK
);
2041 serial_out(info
, UART_ESI_CMD2
, info
->IER
);
2043 /* disable receive timeout */
2044 serial_out(info
, UART_ESI_CMD1
, ESI_SET_RX_TIMEOUT
);
2045 serial_out(info
, UART_ESI_CMD2
, 0x00);
2047 spin_unlock_irqrestore(&info
->lock
, flags
);
2050 * Before we drop DTR, make sure the UART transmitter
2051 * has completely drained; this is especially
2052 * important if there is a transmit FIFO!
2054 rs_wait_until_sent(tty
, info
->timeout
);
2057 if (tty
->driver
->flush_buffer
)
2058 tty
->driver
->flush_buffer(tty
);
2059 tty_ldisc_flush(tty
);
2064 if (info
->blocked_open
) {
2065 if (info
->close_delay
) {
2066 msleep_interruptible(jiffies_to_msecs(info
->close_delay
));
2068 wake_up_interruptible(&info
->open_wait
);
2070 info
->flags
&= ~(ASYNC_NORMAL_ACTIVE
|ASYNC_CLOSING
);
2071 wake_up_interruptible(&info
->close_wait
);
2075 spin_unlock_irqrestore(&info
->lock
, flags
);
2078 static void rs_wait_until_sent(struct tty_struct
*tty
, int timeout
)
2080 struct esp_struct
*info
= (struct esp_struct
*)tty
->driver_data
;
2081 unsigned long orig_jiffies
, char_time
;
2082 unsigned long flags
;
2084 if (serial_paranoia_check(info
, tty
->name
, "rs_wait_until_sent"))
2087 orig_jiffies
= jiffies
;
2088 char_time
= ((info
->timeout
- HZ
/ 50) / 1024) / 5;
2093 spin_lock_irqsave(&info
->lock
, flags
);
2094 serial_out(info
, UART_ESI_CMD1
, ESI_NO_COMMAND
);
2095 serial_out(info
, UART_ESI_CMD1
, ESI_GET_TX_AVAIL
);
2097 while ((serial_in(info
, UART_ESI_STAT1
) != 0x03) ||
2098 (serial_in(info
, UART_ESI_STAT2
) != 0xff)) {
2100 spin_unlock_irqrestore(&info
->lock
, flags
);
2101 msleep_interruptible(jiffies_to_msecs(char_time
));
2103 if (signal_pending(current
))
2106 if (timeout
&& time_after(jiffies
, orig_jiffies
+ timeout
))
2109 spin_lock_irqsave(&info
->lock
, flags
);
2110 serial_out(info
, UART_ESI_CMD1
, ESI_NO_COMMAND
);
2111 serial_out(info
, UART_ESI_CMD1
, ESI_GET_TX_AVAIL
);
2113 spin_unlock_irqrestore(&info
->lock
, flags
);
2114 set_current_state(TASK_RUNNING
);
2118 * esp_hangup() --- called by tty_hangup() when a hangup is signaled.
2120 static void esp_hangup(struct tty_struct
*tty
)
2122 struct esp_struct
* info
= (struct esp_struct
*)tty
->driver_data
;
2124 if (serial_paranoia_check(info
, tty
->name
, "esp_hangup"))
2127 rs_flush_buffer(tty
);
2131 info
->flags
&= ~ASYNC_NORMAL_ACTIVE
;
2133 wake_up_interruptible(&info
->open_wait
);
2137 * ------------------------------------------------------------
2138 * esp_open() and friends
2139 * ------------------------------------------------------------
2141 static int block_til_ready(struct tty_struct
*tty
, struct file
* filp
,
2142 struct esp_struct
*info
)
2144 DECLARE_WAITQUEUE(wait
, current
);
2147 unsigned long flags
;
2150 * If the device is in the middle of being closed, then block
2151 * until it's done, and then try again.
2153 if (tty_hung_up_p(filp
) ||
2154 (info
->flags
& ASYNC_CLOSING
)) {
2155 if (info
->flags
& ASYNC_CLOSING
)
2156 interruptible_sleep_on(&info
->close_wait
);
2157 #ifdef SERIAL_DO_RESTART
2158 if (info
->flags
& ASYNC_HUP_NOTIFY
)
2161 return -ERESTARTSYS
;
2168 * If non-blocking mode is set, or the port is not enabled,
2169 * then make the check up front and then exit.
2171 if ((filp
->f_flags
& O_NONBLOCK
) ||
2172 (tty
->flags
& (1 << TTY_IO_ERROR
))) {
2173 info
->flags
|= ASYNC_NORMAL_ACTIVE
;
2177 if (tty
->termios
->c_cflag
& CLOCAL
)
2181 * Block waiting for the carrier detect and the line to become
2182 * free (i.e., not in use by the callout). While we are in
2183 * this loop, info->count is dropped by one, so that
2184 * rs_close() knows when to free things. We restore it upon
2185 * exit, either normal or abnormal.
2188 add_wait_queue(&info
->open_wait
, &wait
);
2189 #ifdef SERIAL_DEBUG_OPEN
2190 printk("block_til_ready before block: ttys%d, count = %d\n",
2191 info
->line
, info
->count
);
2193 spin_lock_irqsave(&info
->lock
, flags
);
2194 if (!tty_hung_up_p(filp
))
2196 info
->blocked_open
++;
2198 if ((tty
->termios
->c_cflag
& CBAUD
)) {
2199 unsigned int scratch
;
2201 serial_out(info
, UART_ESI_CMD1
, ESI_READ_UART
);
2202 serial_out(info
, UART_ESI_CMD2
, UART_MCR
);
2203 scratch
= serial_in(info
, UART_ESI_STAT1
);
2204 serial_out(info
, UART_ESI_CMD1
, ESI_WRITE_UART
);
2205 serial_out(info
, UART_ESI_CMD2
, UART_MCR
);
2206 serial_out(info
, UART_ESI_CMD2
,
2207 scratch
| UART_MCR_DTR
| UART_MCR_RTS
);
2209 set_current_state(TASK_INTERRUPTIBLE
);
2210 if (tty_hung_up_p(filp
) ||
2211 !(info
->flags
& ASYNC_INITIALIZED
)) {
2212 #ifdef SERIAL_DO_RESTART
2213 if (info
->flags
& ASYNC_HUP_NOTIFY
)
2216 retval
= -ERESTARTSYS
;
2223 serial_out(info
, UART_ESI_CMD1
, ESI_GET_UART_STAT
);
2224 if (serial_in(info
, UART_ESI_STAT2
) & UART_MSR_DCD
)
2227 if (!(info
->flags
& ASYNC_CLOSING
) &&
2230 if (signal_pending(current
)) {
2231 retval
= -ERESTARTSYS
;
2234 #ifdef SERIAL_DEBUG_OPEN
2235 printk("block_til_ready blocking: ttys%d, count = %d\n",
2236 info
->line
, info
->count
);
2238 spin_unlock_irqrestore(&info
->lock
, flags
);
2240 spin_lock_irqsave(&info
->lock
, flags
);
2242 set_current_state(TASK_RUNNING
);
2243 remove_wait_queue(&info
->open_wait
, &wait
);
2244 if (!tty_hung_up_p(filp
))
2246 info
->blocked_open
--;
2247 spin_unlock_irqrestore(&info
->lock
, flags
);
2248 #ifdef SERIAL_DEBUG_OPEN
2249 printk("block_til_ready after blocking: ttys%d, count = %d\n",
2250 info
->line
, info
->count
);
2254 info
->flags
|= ASYNC_NORMAL_ACTIVE
;
2259 * This routine is called whenever a serial port is opened. It
2260 * enables interrupts for a serial port, linking in its async structure into
2261 * the IRQ chain. It also performs the serial-specific
2262 * initialization for the tty structure.
2264 static int esp_open(struct tty_struct
*tty
, struct file
* filp
)
2266 struct esp_struct
*info
;
2268 unsigned long flags
;
2271 if ((line
< 0) || (line
>= NR_PORTS
))
2274 /* find the port in the chain */
2278 while (info
&& (info
->line
!= line
))
2279 info
= info
->next_port
;
2282 serial_paranoia_check(info
, tty
->name
, "esp_open");
2286 #ifdef SERIAL_DEBUG_OPEN
2287 printk("esp_open %s, count = %d\n", tty
->name
, info
->count
);
2289 spin_lock_irqsave(&info
->lock
, flags
);
2291 tty
->driver_data
= info
;
2295 tmp_buf
= (unsigned char *) get_zeroed_page(GFP_KERNEL
);
2301 * Start up serial port
2303 retval
= startup(info
);
2307 retval
= block_til_ready(tty
, filp
, info
);
2309 #ifdef SERIAL_DEBUG_OPEN
2310 printk("esp_open returning after block_til_ready with %d\n",
2316 #ifdef SERIAL_DEBUG_OPEN
2317 printk("esp_open %s successful...", tty
->name
);
2323 * ---------------------------------------------------------------------
2324 * espserial_init() and friends
2326 * espserial_init() is called at boot-time to initialize the serial driver.
2327 * ---------------------------------------------------------------------
2331 * This routine prints out the appropriate serial driver version
2332 * number, and identifies which options were configured into this
2336 static inline void show_serial_version(void)
2338 printk(KERN_INFO
"%s version %s (DMA %u)\n",
2339 serial_name
, serial_version
, dma
);
2343 * This routine is called by espserial_init() to initialize a specific serial
2346 static inline int autoconfig(struct esp_struct
* info
)
2348 int port_detected
= 0;
2349 unsigned long flags
;
2351 if (!request_region(info
->port
, REGION_SIZE
, "esp serial"))
2354 spin_lock_irqsave(&info
->lock
, flags
);
2356 * Check for ESP card
2359 if (serial_in(info
, UART_ESI_BASE
) == 0xf3) {
2360 serial_out(info
, UART_ESI_CMD1
, 0x00);
2361 serial_out(info
, UART_ESI_CMD1
, 0x01);
2363 if ((serial_in(info
, UART_ESI_STAT2
) & 0x70) == 0x20) {
2367 serial_out(info
, UART_ESI_CMD1
, 0x02);
2369 if (serial_in(info
, UART_ESI_STAT1
) & 0x01)
2376 /* put card in enhanced mode */
2377 /* this prevents access through */
2378 /* the "old" IO ports */
2379 esp_basic_init(info
);
2382 serial_out(info
, UART_ESI_CMD1
, ESI_WRITE_UART
);
2383 serial_out(info
, UART_ESI_CMD2
, UART_MCR
);
2384 serial_out(info
, UART_ESI_CMD2
, 0x00);
2388 release_region(info
->port
, REGION_SIZE
);
2390 spin_unlock_irqrestore(&info
->lock
, flags
);
2391 return (port_detected
);
2394 static struct tty_operations esp_ops
= {
2398 .put_char
= rs_put_char
,
2399 .flush_chars
= rs_flush_chars
,
2400 .write_room
= rs_write_room
,
2401 .chars_in_buffer
= rs_chars_in_buffer
,
2402 .flush_buffer
= rs_flush_buffer
,
2404 .throttle
= rs_throttle
,
2405 .unthrottle
= rs_unthrottle
,
2406 .set_termios
= rs_set_termios
,
2409 .hangup
= esp_hangup
,
2410 .break_ctl
= esp_break
,
2411 .wait_until_sent
= rs_wait_until_sent
,
2412 .tiocmget
= esp_tiocmget
,
2413 .tiocmset
= esp_tiocmset
,
2417 * The serial driver boot-time initialization code!
2419 static int __init
espserial_init(void)
2422 struct esp_struct
* info
;
2423 struct esp_struct
*last_primary
= NULL
;
2424 int esp
[] = {0x100,0x140,0x180,0x200,0x240,0x280,0x300,0x380};
2426 esp_driver
= alloc_tty_driver(NR_PORTS
);
2430 for (i
= 0; i
< NR_PRIMARY
; i
++) {
2432 if ((irq
[i
] < 2) || (irq
[i
] > 15) || (irq
[i
] == 6) ||
2433 (irq
[i
] == 8) || (irq
[i
] == 13))
2435 else if (irq
[i
] == 2)
2440 if ((dma
!= 1) && (dma
!= 3))
2443 if ((rx_trigger
< 1) || (rx_trigger
> 1023))
2446 if ((tx_trigger
< 1) || (tx_trigger
> 1023))
2449 if ((flow_off
< 1) || (flow_off
> 1023))
2452 if ((flow_on
< 1) || (flow_on
> 1023))
2455 if ((rx_timeout
< 0) || (rx_timeout
> 255))
2458 if (flow_on
>= flow_off
)
2459 flow_on
= flow_off
- 1;
2461 show_serial_version();
2463 /* Initialize the tty_driver structure */
2465 esp_driver
->owner
= THIS_MODULE
;
2466 esp_driver
->name
= "ttyP";
2467 esp_driver
->devfs_name
= "tts/P";
2468 esp_driver
->major
= ESP_IN_MAJOR
;
2469 esp_driver
->minor_start
= 0;
2470 esp_driver
->type
= TTY_DRIVER_TYPE_SERIAL
;
2471 esp_driver
->subtype
= SERIAL_TYPE_NORMAL
;
2472 esp_driver
->init_termios
= tty_std_termios
;
2473 esp_driver
->init_termios
.c_cflag
=
2474 B9600
| CS8
| CREAD
| HUPCL
| CLOCAL
;
2475 esp_driver
->flags
= TTY_DRIVER_REAL_RAW
;
2476 tty_set_operations(esp_driver
, &esp_ops
);
2477 if (tty_register_driver(esp_driver
))
2479 printk(KERN_ERR
"Couldn't register esp serial driver");
2480 put_tty_driver(esp_driver
);
2484 info
= kmalloc(sizeof(struct esp_struct
), GFP_KERNEL
);
2488 printk(KERN_ERR
"Couldn't allocate memory for esp serial device information\n");
2489 tty_unregister_driver(esp_driver
);
2490 put_tty_driver(esp_driver
);
2494 memset((void *)info
, 0, sizeof(struct esp_struct
));
2495 spin_lock_init(&info
->lock
);
2496 /* rx_trigger, tx_trigger are needed by autoconfig */
2497 info
->config
.rx_trigger
= rx_trigger
;
2498 info
->config
.tx_trigger
= tx_trigger
;
2504 info
->port
= esp
[i
] + offset
;
2506 info
->line
= (i
* 8) + (offset
/ 8);
2508 if (!autoconfig(info
)) {
2514 info
->custom_divisor
= (divisor
[i
] >> (offset
/ 2)) & 0xf;
2515 info
->flags
= STD_COM_FLAGS
;
2516 if (info
->custom_divisor
)
2517 info
->flags
|= ASYNC_SPD_CUST
;
2518 info
->magic
= ESP_MAGIC
;
2519 info
->close_delay
= 5*HZ
/10;
2520 info
->closing_wait
= 30*HZ
;
2521 INIT_WORK(&info
->tqueue
, do_softint
, info
);
2522 INIT_WORK(&info
->tqueue_hangup
, do_serial_hangup
, info
);
2523 info
->config
.rx_timeout
= rx_timeout
;
2524 info
->config
.flow_on
= flow_on
;
2525 info
->config
.flow_off
= flow_off
;
2526 info
->config
.pio_threshold
= pio_threshold
;
2527 info
->next_port
= ports
;
2528 init_waitqueue_head(&info
->open_wait
);
2529 init_waitqueue_head(&info
->close_wait
);
2530 init_waitqueue_head(&info
->delta_msr_wait
);
2531 init_waitqueue_head(&info
->break_wait
);
2533 printk(KERN_INFO
"ttyP%d at 0x%04x (irq = %d) is an ESP ",
2534 info
->line
, info
->port
, info
->irq
);
2536 if (info
->line
% 8) {
2537 printk("secondary port\n");
2538 /* 8 port cards can't do DMA */
2539 info
->stat_flags
|= ESP_STAT_NEVER_DMA
;
2542 last_primary
->stat_flags
|= ESP_STAT_NEVER_DMA
;
2544 printk("primary port\n");
2545 last_primary
= info
;
2550 info
->stat_flags
|= ESP_STAT_NEVER_DMA
;
2552 info
= kmalloc(sizeof(struct esp_struct
), GFP_KERNEL
);
2555 printk(KERN_ERR
"Couldn't allocate memory for esp serial device information\n");
2557 /* allow use of the already detected ports */
2561 memset((void *)info
, 0, sizeof(struct esp_struct
));
2562 /* rx_trigger, tx_trigger are needed by autoconfig */
2563 info
->config
.rx_trigger
= rx_trigger
;
2564 info
->config
.tx_trigger
= tx_trigger
;
2572 } while (i
< NR_PRIMARY
);
2574 /* free the last port memory allocation */
2580 static void __exit
espserial_exit(void)
2583 struct esp_struct
*temp_async
;
2584 struct esp_pio_buffer
*pio_buf
;
2586 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2587 if ((e1
= tty_unregister_driver(esp_driver
)))
2588 printk("SERIAL: failed to unregister serial driver (%d)\n",
2590 put_tty_driver(esp_driver
);
2594 release_region(ports
->port
, REGION_SIZE
);
2596 temp_async
= ports
->next_port
;
2602 free_pages((unsigned long)dma_buffer
,
2603 get_order(DMA_BUFFER_SZ
));
2606 free_page((unsigned long)tmp_buf
);
2608 while (free_pio_buf
) {
2609 pio_buf
= free_pio_buf
->next
;
2610 kfree(free_pio_buf
);
2611 free_pio_buf
= pio_buf
;
2615 module_init(espserial_init
);
2616 module_exit(espserial_exit
);