Memory controller: accounting setup
[linux-2.6/mini2440.git] / drivers / char / amiserial.c
blob3d468f502d2db021cc99007784ecf14fa59c6526
1 /*
2 * linux/drivers/char/amiserial.c
4 * Serial driver for the amiga builtin port.
6 * This code was created by taking serial.c version 4.30 from kernel
7 * release 2.3.22, replacing all hardware related stuff with the
8 * corresponding amiga hardware actions, and removing all irrelevant
9 * code. As a consequence, it uses many of the constants and names
10 * associated with the registers and bits of 16550 compatible UARTS -
11 * but only to keep track of status, etc in the state variables. It
12 * was done this was to make it easier to keep the code in line with
13 * (non hardware specific) changes to serial.c.
15 * The port is registered with the tty driver as minor device 64, and
16 * therefore other ports should should only use 65 upwards.
18 * Richard Lucock 28/12/99
20 * Copyright (C) 1991, 1992 Linus Torvalds
21 * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
22 * 1998, 1999 Theodore Ts'o
27 * Serial driver configuration section. Here are the various options:
29 * SERIAL_PARANOIA_CHECK
30 * Check the magic number for the async_structure where
31 * ever possible.
34 #include <linux/delay.h>
36 #undef SERIAL_PARANOIA_CHECK
37 #define SERIAL_DO_RESTART
39 /* Set of debugging defines */
41 #undef SERIAL_DEBUG_INTR
42 #undef SERIAL_DEBUG_OPEN
43 #undef SERIAL_DEBUG_FLOW
44 #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
46 /* Sanity checks */
48 #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
49 #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
50 tty->name, (info->flags), serial_driver->refcount,info->count,tty->count,s)
51 #else
52 #define DBG_CNT(s)
53 #endif
56 * End of serial driver configuration section.
59 #include <linux/module.h>
61 #include <linux/types.h>
62 #include <linux/serial.h>
63 #include <linux/serialP.h>
64 #include <linux/serial_reg.h>
65 static char *serial_version = "4.30";
67 #include <linux/errno.h>
68 #include <linux/signal.h>
69 #include <linux/sched.h>
70 #include <linux/kernel.h>
71 #include <linux/timer.h>
72 #include <linux/interrupt.h>
73 #include <linux/tty.h>
74 #include <linux/tty_flip.h>
75 #include <linux/console.h>
76 #include <linux/major.h>
77 #include <linux/string.h>
78 #include <linux/fcntl.h>
79 #include <linux/ptrace.h>
80 #include <linux/ioport.h>
81 #include <linux/mm.h>
82 #include <linux/slab.h>
83 #include <linux/init.h>
84 #include <linux/bitops.h>
86 #include <asm/setup.h>
88 #include <asm/system.h>
90 #include <asm/irq.h>
92 #include <asm/amigahw.h>
93 #include <asm/amigaints.h>
95 #define custom amiga_custom
96 static char *serial_name = "Amiga-builtin serial driver";
98 static struct tty_driver *serial_driver;
100 /* number of characters left in xmit buffer before we ask for more */
101 #define WAKEUP_CHARS 256
103 static struct async_struct *IRQ_ports;
105 static unsigned char current_ctl_bits;
107 static void change_speed(struct async_struct *info, struct ktermios *old);
108 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
111 static struct serial_state rs_table[1];
113 #define NR_PORTS ARRAY_SIZE(rs_table)
115 #include <asm/uaccess.h>
117 #define serial_isroot() (capable(CAP_SYS_ADMIN))
120 static inline int serial_paranoia_check(struct async_struct *info,
121 char *name, const char *routine)
123 #ifdef SERIAL_PARANOIA_CHECK
124 static const char *badmagic =
125 "Warning: bad magic number for serial struct (%s) in %s\n";
126 static const char *badinfo =
127 "Warning: null async_struct for (%s) in %s\n";
129 if (!info) {
130 printk(badinfo, name, routine);
131 return 1;
133 if (info->magic != SERIAL_MAGIC) {
134 printk(badmagic, name, routine);
135 return 1;
137 #endif
138 return 0;
141 /* some serial hardware definitions */
142 #define SDR_OVRUN (1<<15)
143 #define SDR_RBF (1<<14)
144 #define SDR_TBE (1<<13)
145 #define SDR_TSRE (1<<12)
147 #define SERPER_PARENB (1<<15)
149 #define AC_SETCLR (1<<15)
150 #define AC_UARTBRK (1<<11)
152 #define SER_DTR (1<<7)
153 #define SER_RTS (1<<6)
154 #define SER_DCD (1<<5)
155 #define SER_CTS (1<<4)
156 #define SER_DSR (1<<3)
158 static __inline__ void rtsdtr_ctrl(int bits)
160 ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
164 * ------------------------------------------------------------
165 * rs_stop() and rs_start()
167 * This routines are called before setting or resetting tty->stopped.
168 * They enable or disable transmitter interrupts, as necessary.
169 * ------------------------------------------------------------
171 static void rs_stop(struct tty_struct *tty)
173 struct async_struct *info = (struct async_struct *)tty->driver_data;
174 unsigned long flags;
176 if (serial_paranoia_check(info, tty->name, "rs_stop"))
177 return;
179 local_irq_save(flags);
180 if (info->IER & UART_IER_THRI) {
181 info->IER &= ~UART_IER_THRI;
182 /* disable Tx interrupt and remove any pending interrupts */
183 custom.intena = IF_TBE;
184 mb();
185 custom.intreq = IF_TBE;
186 mb();
188 local_irq_restore(flags);
191 static void rs_start(struct tty_struct *tty)
193 struct async_struct *info = (struct async_struct *)tty->driver_data;
194 unsigned long flags;
196 if (serial_paranoia_check(info, tty->name, "rs_start"))
197 return;
199 local_irq_save(flags);
200 if (info->xmit.head != info->xmit.tail
201 && info->xmit.buf
202 && !(info->IER & UART_IER_THRI)) {
203 info->IER |= UART_IER_THRI;
204 custom.intena = IF_SETCLR | IF_TBE;
205 mb();
206 /* set a pending Tx Interrupt, transmitter should restart now */
207 custom.intreq = IF_SETCLR | IF_TBE;
208 mb();
210 local_irq_restore(flags);
214 * ----------------------------------------------------------------------
216 * Here starts the interrupt handling routines. All of the following
217 * subroutines are declared as inline and are folded into
218 * rs_interrupt(). They were separated out for readability's sake.
220 * Note: rs_interrupt() is a "fast" interrupt, which means that it
221 * runs with interrupts turned off. People who may want to modify
222 * rs_interrupt() should try to keep the interrupt handler as fast as
223 * possible. After you are done making modifications, it is not a bad
224 * idea to do:
226 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
228 * and look at the resulting assemble code in serial.s.
230 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
231 * -----------------------------------------------------------------------
235 * This routine is used by the interrupt handler to schedule
236 * processing in the software interrupt portion of the driver.
238 static void rs_sched_event(struct async_struct *info,
239 int event)
241 info->event |= 1 << event;
242 tasklet_schedule(&info->tlet);
245 static void receive_chars(struct async_struct *info)
247 int status;
248 int serdatr;
249 struct tty_struct *tty = info->tty;
250 unsigned char ch, flag;
251 struct async_icount *icount;
252 int oe = 0;
254 icount = &info->state->icount;
256 status = UART_LSR_DR; /* We obviously have a character! */
257 serdatr = custom.serdatr;
258 mb();
259 custom.intreq = IF_RBF;
260 mb();
262 if((serdatr & 0x1ff) == 0)
263 status |= UART_LSR_BI;
264 if(serdatr & SDR_OVRUN)
265 status |= UART_LSR_OE;
267 ch = serdatr & 0xff;
268 icount->rx++;
270 #ifdef SERIAL_DEBUG_INTR
271 printk("DR%02x:%02x...", ch, status);
272 #endif
273 flag = TTY_NORMAL;
276 * We don't handle parity or frame errors - but I have left
277 * the code in, since I'm not sure that the errors can't be
278 * detected.
281 if (status & (UART_LSR_BI | UART_LSR_PE |
282 UART_LSR_FE | UART_LSR_OE)) {
284 * For statistics only
286 if (status & UART_LSR_BI) {
287 status &= ~(UART_LSR_FE | UART_LSR_PE);
288 icount->brk++;
289 } else if (status & UART_LSR_PE)
290 icount->parity++;
291 else if (status & UART_LSR_FE)
292 icount->frame++;
293 if (status & UART_LSR_OE)
294 icount->overrun++;
297 * Now check to see if character should be
298 * ignored, and mask off conditions which
299 * should be ignored.
301 if (status & info->ignore_status_mask)
302 goto out;
304 status &= info->read_status_mask;
306 if (status & (UART_LSR_BI)) {
307 #ifdef SERIAL_DEBUG_INTR
308 printk("handling break....");
309 #endif
310 flag = TTY_BREAK;
311 if (info->flags & ASYNC_SAK)
312 do_SAK(tty);
313 } else if (status & UART_LSR_PE)
314 flag = TTY_PARITY;
315 else if (status & UART_LSR_FE)
316 flag = TTY_FRAME;
317 if (status & UART_LSR_OE) {
319 * Overrun is special, since it's
320 * reported immediately, and doesn't
321 * affect the current character
323 oe = 1;
326 tty_insert_flip_char(tty, ch, flag);
327 if (oe == 1)
328 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
329 tty_flip_buffer_push(tty);
330 out:
331 return;
334 static void transmit_chars(struct async_struct *info)
336 custom.intreq = IF_TBE;
337 mb();
338 if (info->x_char) {
339 custom.serdat = info->x_char | 0x100;
340 mb();
341 info->state->icount.tx++;
342 info->x_char = 0;
343 return;
345 if (info->xmit.head == info->xmit.tail
346 || info->tty->stopped
347 || info->tty->hw_stopped) {
348 info->IER &= ~UART_IER_THRI;
349 custom.intena = IF_TBE;
350 mb();
351 return;
354 custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
355 mb();
356 info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
357 info->state->icount.tx++;
359 if (CIRC_CNT(info->xmit.head,
360 info->xmit.tail,
361 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
362 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
364 #ifdef SERIAL_DEBUG_INTR
365 printk("THRE...");
366 #endif
367 if (info->xmit.head == info->xmit.tail) {
368 custom.intena = IF_TBE;
369 mb();
370 info->IER &= ~UART_IER_THRI;
374 static void check_modem_status(struct async_struct *info)
376 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
377 unsigned char dstatus;
378 struct async_icount *icount;
380 /* Determine bits that have changed */
381 dstatus = status ^ current_ctl_bits;
382 current_ctl_bits = status;
384 if (dstatus) {
385 icount = &info->state->icount;
386 /* update input line counters */
387 if (dstatus & SER_DSR)
388 icount->dsr++;
389 if (dstatus & SER_DCD) {
390 icount->dcd++;
391 #ifdef CONFIG_HARD_PPS
392 if ((info->flags & ASYNC_HARDPPS_CD) &&
393 !(status & SER_DCD))
394 hardpps();
395 #endif
397 if (dstatus & SER_CTS)
398 icount->cts++;
399 wake_up_interruptible(&info->delta_msr_wait);
402 if ((info->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) {
403 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
404 printk("ttyS%d CD now %s...", info->line,
405 (!(status & SER_DCD)) ? "on" : "off");
406 #endif
407 if (!(status & SER_DCD))
408 wake_up_interruptible(&info->open_wait);
409 else {
410 #ifdef SERIAL_DEBUG_OPEN
411 printk("doing serial hangup...");
412 #endif
413 if (info->tty)
414 tty_hangup(info->tty);
417 if (info->flags & ASYNC_CTS_FLOW) {
418 if (info->tty->hw_stopped) {
419 if (!(status & SER_CTS)) {
420 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
421 printk("CTS tx start...");
422 #endif
423 info->tty->hw_stopped = 0;
424 info->IER |= UART_IER_THRI;
425 custom.intena = IF_SETCLR | IF_TBE;
426 mb();
427 /* set a pending Tx Interrupt, transmitter should restart now */
428 custom.intreq = IF_SETCLR | IF_TBE;
429 mb();
430 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
431 return;
433 } else {
434 if ((status & SER_CTS)) {
435 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
436 printk("CTS tx stop...");
437 #endif
438 info->tty->hw_stopped = 1;
439 info->IER &= ~UART_IER_THRI;
440 /* disable Tx interrupt and remove any pending interrupts */
441 custom.intena = IF_TBE;
442 mb();
443 custom.intreq = IF_TBE;
444 mb();
450 static irqreturn_t ser_vbl_int( int irq, void *data)
452 /* vbl is just a periodic interrupt we tie into to update modem status */
453 struct async_struct * info = IRQ_ports;
455 * TBD - is it better to unregister from this interrupt or to
456 * ignore it if MSI is clear ?
458 if(info->IER & UART_IER_MSI)
459 check_modem_status(info);
460 return IRQ_HANDLED;
463 static irqreturn_t ser_rx_int(int irq, void *dev_id)
465 struct async_struct * info;
467 #ifdef SERIAL_DEBUG_INTR
468 printk("ser_rx_int...");
469 #endif
471 info = IRQ_ports;
472 if (!info || !info->tty)
473 return IRQ_NONE;
475 receive_chars(info);
476 info->last_active = jiffies;
477 #ifdef SERIAL_DEBUG_INTR
478 printk("end.\n");
479 #endif
480 return IRQ_HANDLED;
483 static irqreturn_t ser_tx_int(int irq, void *dev_id)
485 struct async_struct * info;
487 if (custom.serdatr & SDR_TBE) {
488 #ifdef SERIAL_DEBUG_INTR
489 printk("ser_tx_int...");
490 #endif
492 info = IRQ_ports;
493 if (!info || !info->tty)
494 return IRQ_NONE;
496 transmit_chars(info);
497 info->last_active = jiffies;
498 #ifdef SERIAL_DEBUG_INTR
499 printk("end.\n");
500 #endif
502 return IRQ_HANDLED;
506 * -------------------------------------------------------------------
507 * Here ends the serial interrupt routines.
508 * -------------------------------------------------------------------
512 * This routine is used to handle the "bottom half" processing for the
513 * serial driver, known also the "software interrupt" processing.
514 * This processing is done at the kernel interrupt level, after the
515 * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
516 * is where time-consuming activities which can not be done in the
517 * interrupt driver proper are done; the interrupt driver schedules
518 * them using rs_sched_event(), and they get done here.
521 static void do_softint(unsigned long private_)
523 struct async_struct *info = (struct async_struct *) private_;
524 struct tty_struct *tty;
526 tty = info->tty;
527 if (!tty)
528 return;
530 if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event))
531 tty_wakeup(tty);
535 * ---------------------------------------------------------------
536 * Low level utility subroutines for the serial driver: routines to
537 * figure out the appropriate timeout for an interrupt chain, routines
538 * to initialize and startup a serial port, and routines to shutdown a
539 * serial port. Useful stuff like that.
540 * ---------------------------------------------------------------
543 static int startup(struct async_struct * info)
545 unsigned long flags;
546 int retval=0;
547 unsigned long page;
549 page = get_zeroed_page(GFP_KERNEL);
550 if (!page)
551 return -ENOMEM;
553 local_irq_save(flags);
555 if (info->flags & ASYNC_INITIALIZED) {
556 free_page(page);
557 goto errout;
560 if (info->xmit.buf)
561 free_page(page);
562 else
563 info->xmit.buf = (unsigned char *) page;
565 #ifdef SERIAL_DEBUG_OPEN
566 printk("starting up ttys%d ...", info->line);
567 #endif
569 /* Clear anything in the input buffer */
571 custom.intreq = IF_RBF;
572 mb();
574 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
575 if (retval) {
576 if (serial_isroot()) {
577 if (info->tty)
578 set_bit(TTY_IO_ERROR,
579 &info->tty->flags);
580 retval = 0;
582 goto errout;
585 /* enable both Rx and Tx interrupts */
586 custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
587 mb();
588 info->IER = UART_IER_MSI;
590 /* remember current state of the DCD and CTS bits */
591 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
593 IRQ_ports = info;
595 info->MCR = 0;
596 if (info->tty->termios->c_cflag & CBAUD)
597 info->MCR = SER_DTR | SER_RTS;
598 rtsdtr_ctrl(info->MCR);
600 if (info->tty)
601 clear_bit(TTY_IO_ERROR, &info->tty->flags);
602 info->xmit.head = info->xmit.tail = 0;
605 * Set up the tty->alt_speed kludge
607 if (info->tty) {
608 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
609 info->tty->alt_speed = 57600;
610 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
611 info->tty->alt_speed = 115200;
612 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
613 info->tty->alt_speed = 230400;
614 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
615 info->tty->alt_speed = 460800;
619 * and set the speed of the serial port
621 change_speed(info, NULL);
623 info->flags |= ASYNC_INITIALIZED;
624 local_irq_restore(flags);
625 return 0;
627 errout:
628 local_irq_restore(flags);
629 return retval;
633 * This routine will shutdown a serial port; interrupts are disabled, and
634 * DTR is dropped if the hangup on close termio flag is on.
636 static void shutdown(struct async_struct * info)
638 unsigned long flags;
639 struct serial_state *state;
641 if (!(info->flags & ASYNC_INITIALIZED))
642 return;
644 state = info->state;
646 #ifdef SERIAL_DEBUG_OPEN
647 printk("Shutting down serial port %d ....\n", info->line);
648 #endif
650 local_irq_save(flags); /* Disable interrupts */
653 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
654 * here so the queue might never be waken up
656 wake_up_interruptible(&info->delta_msr_wait);
658 IRQ_ports = NULL;
661 * Free the IRQ, if necessary
663 free_irq(IRQ_AMIGA_VERTB, info);
665 if (info->xmit.buf) {
666 free_page((unsigned long) info->xmit.buf);
667 info->xmit.buf = NULL;
670 info->IER = 0;
671 custom.intena = IF_RBF | IF_TBE;
672 mb();
674 /* disable break condition */
675 custom.adkcon = AC_UARTBRK;
676 mb();
678 if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
679 info->MCR &= ~(SER_DTR|SER_RTS);
680 rtsdtr_ctrl(info->MCR);
682 if (info->tty)
683 set_bit(TTY_IO_ERROR, &info->tty->flags);
685 info->flags &= ~ASYNC_INITIALIZED;
686 local_irq_restore(flags);
691 * This routine is called to set the UART divisor registers to match
692 * the specified baud rate for a serial port.
694 static void change_speed(struct async_struct *info,
695 struct ktermios *old_termios)
697 int quot = 0, baud_base, baud;
698 unsigned cflag, cval = 0;
699 int bits;
700 unsigned long flags;
702 if (!info->tty || !info->tty->termios)
703 return;
704 cflag = info->tty->termios->c_cflag;
706 /* Byte size is always 8 bits plus parity bit if requested */
708 cval = 3; bits = 10;
709 if (cflag & CSTOPB) {
710 cval |= 0x04;
711 bits++;
713 if (cflag & PARENB) {
714 cval |= UART_LCR_PARITY;
715 bits++;
717 if (!(cflag & PARODD))
718 cval |= UART_LCR_EPAR;
719 #ifdef CMSPAR
720 if (cflag & CMSPAR)
721 cval |= UART_LCR_SPAR;
722 #endif
724 /* Determine divisor based on baud rate */
725 baud = tty_get_baud_rate(info->tty);
726 if (!baud)
727 baud = 9600; /* B0 transition handled in rs_set_termios */
728 baud_base = info->state->baud_base;
729 if (baud == 38400 &&
730 ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
731 quot = info->state->custom_divisor;
732 else {
733 if (baud == 134)
734 /* Special case since 134 is really 134.5 */
735 quot = (2*baud_base / 269);
736 else if (baud)
737 quot = baud_base / baud;
739 /* If the quotient is zero refuse the change */
740 if (!quot && old_termios) {
741 /* FIXME: Will need updating for new tty in the end */
742 info->tty->termios->c_cflag &= ~CBAUD;
743 info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
744 baud = tty_get_baud_rate(info->tty);
745 if (!baud)
746 baud = 9600;
747 if (baud == 38400 &&
748 ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
749 quot = info->state->custom_divisor;
750 else {
751 if (baud == 134)
752 /* Special case since 134 is really 134.5 */
753 quot = (2*baud_base / 269);
754 else if (baud)
755 quot = baud_base / baud;
758 /* As a last resort, if the quotient is zero, default to 9600 bps */
759 if (!quot)
760 quot = baud_base / 9600;
761 info->quot = quot;
762 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
763 info->timeout += HZ/50; /* Add .02 seconds of slop */
765 /* CTS flow control flag and modem status interrupts */
766 info->IER &= ~UART_IER_MSI;
767 if (info->flags & ASYNC_HARDPPS_CD)
768 info->IER |= UART_IER_MSI;
769 if (cflag & CRTSCTS) {
770 info->flags |= ASYNC_CTS_FLOW;
771 info->IER |= UART_IER_MSI;
772 } else
773 info->flags &= ~ASYNC_CTS_FLOW;
774 if (cflag & CLOCAL)
775 info->flags &= ~ASYNC_CHECK_CD;
776 else {
777 info->flags |= ASYNC_CHECK_CD;
778 info->IER |= UART_IER_MSI;
780 /* TBD:
781 * Does clearing IER_MSI imply that we should disbale the VBL interrupt ?
785 * Set up parity check flag
788 info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
789 if (I_INPCK(info->tty))
790 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
791 if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
792 info->read_status_mask |= UART_LSR_BI;
795 * Characters to ignore
797 info->ignore_status_mask = 0;
798 if (I_IGNPAR(info->tty))
799 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
800 if (I_IGNBRK(info->tty)) {
801 info->ignore_status_mask |= UART_LSR_BI;
803 * If we're ignore parity and break indicators, ignore
804 * overruns too. (For real raw support).
806 if (I_IGNPAR(info->tty))
807 info->ignore_status_mask |= UART_LSR_OE;
810 * !!! ignore all characters if CREAD is not set
812 if ((cflag & CREAD) == 0)
813 info->ignore_status_mask |= UART_LSR_DR;
814 local_irq_save(flags);
817 short serper;
819 /* Set up the baud rate */
820 serper = quot - 1;
822 /* Enable or disable parity bit */
824 if(cval & UART_LCR_PARITY)
825 serper |= (SERPER_PARENB);
827 custom.serper = serper;
828 mb();
831 info->LCR = cval; /* Save LCR */
832 local_irq_restore(flags);
835 static void rs_put_char(struct tty_struct *tty, unsigned char ch)
837 struct async_struct *info;
838 unsigned long flags;
840 if (!tty)
841 return;
843 info = tty->driver_data;
845 if (serial_paranoia_check(info, tty->name, "rs_put_char"))
846 return;
848 if (!info->xmit.buf)
849 return;
851 local_irq_save(flags);
852 if (CIRC_SPACE(info->xmit.head,
853 info->xmit.tail,
854 SERIAL_XMIT_SIZE) == 0) {
855 local_irq_restore(flags);
856 return;
859 info->xmit.buf[info->xmit.head++] = ch;
860 info->xmit.head &= SERIAL_XMIT_SIZE-1;
861 local_irq_restore(flags);
864 static void rs_flush_chars(struct tty_struct *tty)
866 struct async_struct *info = (struct async_struct *)tty->driver_data;
867 unsigned long flags;
869 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
870 return;
872 if (info->xmit.head == info->xmit.tail
873 || tty->stopped
874 || tty->hw_stopped
875 || !info->xmit.buf)
876 return;
878 local_irq_save(flags);
879 info->IER |= UART_IER_THRI;
880 custom.intena = IF_SETCLR | IF_TBE;
881 mb();
882 /* set a pending Tx Interrupt, transmitter should restart now */
883 custom.intreq = IF_SETCLR | IF_TBE;
884 mb();
885 local_irq_restore(flags);
888 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
890 int c, ret = 0;
891 struct async_struct *info;
892 unsigned long flags;
894 if (!tty)
895 return 0;
897 info = tty->driver_data;
899 if (serial_paranoia_check(info, tty->name, "rs_write"))
900 return 0;
902 if (!info->xmit.buf)
903 return 0;
905 local_irq_save(flags);
906 while (1) {
907 c = CIRC_SPACE_TO_END(info->xmit.head,
908 info->xmit.tail,
909 SERIAL_XMIT_SIZE);
910 if (count < c)
911 c = count;
912 if (c <= 0) {
913 break;
915 memcpy(info->xmit.buf + info->xmit.head, buf, c);
916 info->xmit.head = ((info->xmit.head + c) &
917 (SERIAL_XMIT_SIZE-1));
918 buf += c;
919 count -= c;
920 ret += c;
922 local_irq_restore(flags);
924 if (info->xmit.head != info->xmit.tail
925 && !tty->stopped
926 && !tty->hw_stopped
927 && !(info->IER & UART_IER_THRI)) {
928 info->IER |= UART_IER_THRI;
929 local_irq_disable();
930 custom.intena = IF_SETCLR | IF_TBE;
931 mb();
932 /* set a pending Tx Interrupt, transmitter should restart now */
933 custom.intreq = IF_SETCLR | IF_TBE;
934 mb();
935 local_irq_restore(flags);
937 return ret;
940 static int rs_write_room(struct tty_struct *tty)
942 struct async_struct *info = (struct async_struct *)tty->driver_data;
944 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
945 return 0;
946 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
949 static int rs_chars_in_buffer(struct tty_struct *tty)
951 struct async_struct *info = (struct async_struct *)tty->driver_data;
953 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
954 return 0;
955 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
958 static void rs_flush_buffer(struct tty_struct *tty)
960 struct async_struct *info = (struct async_struct *)tty->driver_data;
961 unsigned long flags;
963 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
964 return;
965 local_irq_save(flags);
966 info->xmit.head = info->xmit.tail = 0;
967 local_irq_restore(flags);
968 tty_wakeup(tty);
972 * This function is used to send a high-priority XON/XOFF character to
973 * the device
975 static void rs_send_xchar(struct tty_struct *tty, char ch)
977 struct async_struct *info = (struct async_struct *)tty->driver_data;
978 unsigned long flags;
980 if (serial_paranoia_check(info, tty->name, "rs_send_char"))
981 return;
983 info->x_char = ch;
984 if (ch) {
985 /* Make sure transmit interrupts are on */
987 /* Check this ! */
988 local_irq_save(flags);
989 if(!(custom.intenar & IF_TBE)) {
990 custom.intena = IF_SETCLR | IF_TBE;
991 mb();
992 /* set a pending Tx Interrupt, transmitter should restart now */
993 custom.intreq = IF_SETCLR | IF_TBE;
994 mb();
996 local_irq_restore(flags);
998 info->IER |= UART_IER_THRI;
1003 * ------------------------------------------------------------
1004 * rs_throttle()
1006 * This routine is called by the upper-layer tty layer to signal that
1007 * incoming characters should be throttled.
1008 * ------------------------------------------------------------
1010 static void rs_throttle(struct tty_struct * tty)
1012 struct async_struct *info = (struct async_struct *)tty->driver_data;
1013 unsigned long flags;
1014 #ifdef SERIAL_DEBUG_THROTTLE
1015 char buf[64];
1017 printk("throttle %s: %d....\n", tty_name(tty, buf),
1018 tty->ldisc.chars_in_buffer(tty));
1019 #endif
1021 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1022 return;
1024 if (I_IXOFF(tty))
1025 rs_send_xchar(tty, STOP_CHAR(tty));
1027 if (tty->termios->c_cflag & CRTSCTS)
1028 info->MCR &= ~SER_RTS;
1030 local_irq_save(flags);
1031 rtsdtr_ctrl(info->MCR);
1032 local_irq_restore(flags);
1035 static void rs_unthrottle(struct tty_struct * tty)
1037 struct async_struct *info = (struct async_struct *)tty->driver_data;
1038 unsigned long flags;
1039 #ifdef SERIAL_DEBUG_THROTTLE
1040 char buf[64];
1042 printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1043 tty->ldisc.chars_in_buffer(tty));
1044 #endif
1046 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1047 return;
1049 if (I_IXOFF(tty)) {
1050 if (info->x_char)
1051 info->x_char = 0;
1052 else
1053 rs_send_xchar(tty, START_CHAR(tty));
1055 if (tty->termios->c_cflag & CRTSCTS)
1056 info->MCR |= SER_RTS;
1057 local_irq_save(flags);
1058 rtsdtr_ctrl(info->MCR);
1059 local_irq_restore(flags);
1063 * ------------------------------------------------------------
1064 * rs_ioctl() and friends
1065 * ------------------------------------------------------------
1068 static int get_serial_info(struct async_struct * info,
1069 struct serial_struct __user * retinfo)
1071 struct serial_struct tmp;
1072 struct serial_state *state = info->state;
1074 if (!retinfo)
1075 return -EFAULT;
1076 memset(&tmp, 0, sizeof(tmp));
1077 tmp.type = state->type;
1078 tmp.line = state->line;
1079 tmp.port = state->port;
1080 tmp.irq = state->irq;
1081 tmp.flags = state->flags;
1082 tmp.xmit_fifo_size = state->xmit_fifo_size;
1083 tmp.baud_base = state->baud_base;
1084 tmp.close_delay = state->close_delay;
1085 tmp.closing_wait = state->closing_wait;
1086 tmp.custom_divisor = state->custom_divisor;
1087 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1088 return -EFAULT;
1089 return 0;
1092 static int set_serial_info(struct async_struct * info,
1093 struct serial_struct __user * new_info)
1095 struct serial_struct new_serial;
1096 struct serial_state old_state, *state;
1097 unsigned int change_irq,change_port;
1098 int retval = 0;
1100 if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1101 return -EFAULT;
1102 state = info->state;
1103 old_state = *state;
1105 change_irq = new_serial.irq != state->irq;
1106 change_port = (new_serial.port != state->port);
1107 if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size))
1108 return -EINVAL;
1110 if (!serial_isroot()) {
1111 if ((new_serial.baud_base != state->baud_base) ||
1112 (new_serial.close_delay != state->close_delay) ||
1113 (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1114 ((new_serial.flags & ~ASYNC_USR_MASK) !=
1115 (state->flags & ~ASYNC_USR_MASK)))
1116 return -EPERM;
1117 state->flags = ((state->flags & ~ASYNC_USR_MASK) |
1118 (new_serial.flags & ASYNC_USR_MASK));
1119 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1120 (new_serial.flags & ASYNC_USR_MASK));
1121 state->custom_divisor = new_serial.custom_divisor;
1122 goto check_and_exit;
1125 if (new_serial.baud_base < 9600)
1126 return -EINVAL;
1129 * OK, past this point, all the error checking has been done.
1130 * At this point, we start making changes.....
1133 state->baud_base = new_serial.baud_base;
1134 state->flags = ((state->flags & ~ASYNC_FLAGS) |
1135 (new_serial.flags & ASYNC_FLAGS));
1136 info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
1137 (info->flags & ASYNC_INTERNAL_FLAGS));
1138 state->custom_divisor = new_serial.custom_divisor;
1139 state->close_delay = new_serial.close_delay * HZ/100;
1140 state->closing_wait = new_serial.closing_wait * HZ/100;
1141 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1143 check_and_exit:
1144 if (info->flags & ASYNC_INITIALIZED) {
1145 if (((old_state.flags & ASYNC_SPD_MASK) !=
1146 (state->flags & ASYNC_SPD_MASK)) ||
1147 (old_state.custom_divisor != state->custom_divisor)) {
1148 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1149 info->tty->alt_speed = 57600;
1150 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1151 info->tty->alt_speed = 115200;
1152 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1153 info->tty->alt_speed = 230400;
1154 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1155 info->tty->alt_speed = 460800;
1156 change_speed(info, NULL);
1158 } else
1159 retval = startup(info);
1160 return retval;
1165 * get_lsr_info - get line status register info
1167 * Purpose: Let user call ioctl() to get info when the UART physically
1168 * is emptied. On bus types like RS485, the transmitter must
1169 * release the bus after transmitting. This must be done when
1170 * the transmit shift register is empty, not be done when the
1171 * transmit holding register is empty. This functionality
1172 * allows an RS485 driver to be written in user space.
1174 static int get_lsr_info(struct async_struct * info, unsigned int __user *value)
1176 unsigned char status;
1177 unsigned int result;
1178 unsigned long flags;
1180 local_irq_save(flags);
1181 status = custom.serdatr;
1182 mb();
1183 local_irq_restore(flags);
1184 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1185 if (copy_to_user(value, &result, sizeof(int)))
1186 return -EFAULT;
1187 return 0;
1191 static int rs_tiocmget(struct tty_struct *tty, struct file *file)
1193 struct async_struct * info = (struct async_struct *)tty->driver_data;
1194 unsigned char control, status;
1195 unsigned long flags;
1197 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1198 return -ENODEV;
1199 if (tty->flags & (1 << TTY_IO_ERROR))
1200 return -EIO;
1202 control = info->MCR;
1203 local_irq_save(flags);
1204 status = ciab.pra;
1205 local_irq_restore(flags);
1206 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1207 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1208 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1209 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1210 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1213 static int rs_tiocmset(struct tty_struct *tty, struct file *file,
1214 unsigned int set, unsigned int clear)
1216 struct async_struct * info = (struct async_struct *)tty->driver_data;
1217 unsigned long flags;
1219 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1220 return -ENODEV;
1221 if (tty->flags & (1 << TTY_IO_ERROR))
1222 return -EIO;
1224 local_irq_save(flags);
1225 if (set & TIOCM_RTS)
1226 info->MCR |= SER_RTS;
1227 if (set & TIOCM_DTR)
1228 info->MCR |= SER_DTR;
1229 if (clear & TIOCM_RTS)
1230 info->MCR &= ~SER_RTS;
1231 if (clear & TIOCM_DTR)
1232 info->MCR &= ~SER_DTR;
1233 rtsdtr_ctrl(info->MCR);
1234 local_irq_restore(flags);
1235 return 0;
1239 * rs_break() --- routine which turns the break handling on or off
1241 static void rs_break(struct tty_struct *tty, int break_state)
1243 struct async_struct * info = (struct async_struct *)tty->driver_data;
1244 unsigned long flags;
1246 if (serial_paranoia_check(info, tty->name, "rs_break"))
1247 return;
1249 local_irq_save(flags);
1250 if (break_state == -1)
1251 custom.adkcon = AC_SETCLR | AC_UARTBRK;
1252 else
1253 custom.adkcon = AC_UARTBRK;
1254 mb();
1255 local_irq_restore(flags);
1259 static int rs_ioctl(struct tty_struct *tty, struct file * file,
1260 unsigned int cmd, unsigned long arg)
1262 struct async_struct * info = (struct async_struct *)tty->driver_data;
1263 struct async_icount cprev, cnow; /* kernel counter temps */
1264 struct serial_icounter_struct icount;
1265 void __user *argp = (void __user *)arg;
1266 unsigned long flags;
1268 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1269 return -ENODEV;
1271 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1272 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1273 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1274 if (tty->flags & (1 << TTY_IO_ERROR))
1275 return -EIO;
1278 switch (cmd) {
1279 case TIOCGSERIAL:
1280 return get_serial_info(info, argp);
1281 case TIOCSSERIAL:
1282 return set_serial_info(info, argp);
1283 case TIOCSERCONFIG:
1284 return 0;
1286 case TIOCSERGETLSR: /* Get line status register */
1287 return get_lsr_info(info, argp);
1289 case TIOCSERGSTRUCT:
1290 if (copy_to_user(argp,
1291 info, sizeof(struct async_struct)))
1292 return -EFAULT;
1293 return 0;
1296 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1297 * - mask passed in arg for lines of interest
1298 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1299 * Caller should use TIOCGICOUNT to see which one it was
1301 case TIOCMIWAIT:
1302 local_irq_save(flags);
1303 /* note the counters on entry */
1304 cprev = info->state->icount;
1305 local_irq_restore(flags);
1306 while (1) {
1307 interruptible_sleep_on(&info->delta_msr_wait);
1308 /* see if a signal did it */
1309 if (signal_pending(current))
1310 return -ERESTARTSYS;
1311 local_irq_save(flags);
1312 cnow = info->state->icount; /* atomic copy */
1313 local_irq_restore(flags);
1314 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1315 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1316 return -EIO; /* no change => error */
1317 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1318 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1319 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1320 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1321 return 0;
1323 cprev = cnow;
1325 /* NOTREACHED */
1328 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1329 * Return: write counters to the user passed counter struct
1330 * NB: both 1->0 and 0->1 transitions are counted except for
1331 * RI where only 0->1 is counted.
1333 case TIOCGICOUNT:
1334 local_irq_save(flags);
1335 cnow = info->state->icount;
1336 local_irq_restore(flags);
1337 icount.cts = cnow.cts;
1338 icount.dsr = cnow.dsr;
1339 icount.rng = cnow.rng;
1340 icount.dcd = cnow.dcd;
1341 icount.rx = cnow.rx;
1342 icount.tx = cnow.tx;
1343 icount.frame = cnow.frame;
1344 icount.overrun = cnow.overrun;
1345 icount.parity = cnow.parity;
1346 icount.brk = cnow.brk;
1347 icount.buf_overrun = cnow.buf_overrun;
1349 if (copy_to_user(argp, &icount, sizeof(icount)))
1350 return -EFAULT;
1351 return 0;
1352 case TIOCSERGWILD:
1353 case TIOCSERSWILD:
1354 /* "setserial -W" is called in Debian boot */
1355 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1356 return 0;
1358 default:
1359 return -ENOIOCTLCMD;
1361 return 0;
1364 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1366 struct async_struct *info = (struct async_struct *)tty->driver_data;
1367 unsigned long flags;
1368 unsigned int cflag = tty->termios->c_cflag;
1370 change_speed(info, old_termios);
1372 /* Handle transition to B0 status */
1373 if ((old_termios->c_cflag & CBAUD) &&
1374 !(cflag & CBAUD)) {
1375 info->MCR &= ~(SER_DTR|SER_RTS);
1376 local_irq_save(flags);
1377 rtsdtr_ctrl(info->MCR);
1378 local_irq_restore(flags);
1381 /* Handle transition away from B0 status */
1382 if (!(old_termios->c_cflag & CBAUD) &&
1383 (cflag & CBAUD)) {
1384 info->MCR |= SER_DTR;
1385 if (!(tty->termios->c_cflag & CRTSCTS) ||
1386 !test_bit(TTY_THROTTLED, &tty->flags)) {
1387 info->MCR |= SER_RTS;
1389 local_irq_save(flags);
1390 rtsdtr_ctrl(info->MCR);
1391 local_irq_restore(flags);
1394 /* Handle turning off CRTSCTS */
1395 if ((old_termios->c_cflag & CRTSCTS) &&
1396 !(tty->termios->c_cflag & CRTSCTS)) {
1397 tty->hw_stopped = 0;
1398 rs_start(tty);
1401 #if 0
1403 * No need to wake up processes in open wait, since they
1404 * sample the CLOCAL flag once, and don't recheck it.
1405 * XXX It's not clear whether the current behavior is correct
1406 * or not. Hence, this may change.....
1408 if (!(old_termios->c_cflag & CLOCAL) &&
1409 (tty->termios->c_cflag & CLOCAL))
1410 wake_up_interruptible(&info->open_wait);
1411 #endif
1415 * ------------------------------------------------------------
1416 * rs_close()
1418 * This routine is called when the serial port gets closed. First, we
1419 * wait for the last remaining data to be sent. Then, we unlink its
1420 * async structure from the interrupt chain if necessary, and we free
1421 * that IRQ if nothing is left in the chain.
1422 * ------------------------------------------------------------
1424 static void rs_close(struct tty_struct *tty, struct file * filp)
1426 struct async_struct * info = (struct async_struct *)tty->driver_data;
1427 struct serial_state *state;
1428 unsigned long flags;
1430 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1431 return;
1433 state = info->state;
1435 local_irq_save(flags);
1437 if (tty_hung_up_p(filp)) {
1438 DBG_CNT("before DEC-hung");
1439 local_irq_restore(flags);
1440 return;
1443 #ifdef SERIAL_DEBUG_OPEN
1444 printk("rs_close ttys%d, count = %d\n", info->line, state->count);
1445 #endif
1446 if ((tty->count == 1) && (state->count != 1)) {
1448 * Uh, oh. tty->count is 1, which means that the tty
1449 * structure will be freed. state->count should always
1450 * be one in these conditions. If it's greater than
1451 * one, we've got real problems, since it means the
1452 * serial port won't be shutdown.
1454 printk("rs_close: bad serial port count; tty->count is 1, "
1455 "state->count is %d\n", state->count);
1456 state->count = 1;
1458 if (--state->count < 0) {
1459 printk("rs_close: bad serial port count for ttys%d: %d\n",
1460 info->line, state->count);
1461 state->count = 0;
1463 if (state->count) {
1464 DBG_CNT("before DEC-2");
1465 local_irq_restore(flags);
1466 return;
1468 info->flags |= ASYNC_CLOSING;
1470 * Now we wait for the transmit buffer to clear; and we notify
1471 * the line discipline to only process XON/XOFF characters.
1473 tty->closing = 1;
1474 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1475 tty_wait_until_sent(tty, info->closing_wait);
1477 * At this point we stop accepting input. To do this, we
1478 * disable the receive line status interrupts, and tell the
1479 * interrupt driver to stop checking the data ready bit in the
1480 * line status register.
1482 info->read_status_mask &= ~UART_LSR_DR;
1483 if (info->flags & ASYNC_INITIALIZED) {
1484 /* disable receive interrupts */
1485 custom.intena = IF_RBF;
1486 mb();
1487 /* clear any pending receive interrupt */
1488 custom.intreq = IF_RBF;
1489 mb();
1492 * Before we drop DTR, make sure the UART transmitter
1493 * has completely drained; this is especially
1494 * important if there is a transmit FIFO!
1496 rs_wait_until_sent(tty, info->timeout);
1498 shutdown(info);
1499 if (tty->driver->flush_buffer)
1500 tty->driver->flush_buffer(tty);
1502 tty_ldisc_flush(tty);
1503 tty->closing = 0;
1504 info->event = 0;
1505 info->tty = NULL;
1506 if (info->blocked_open) {
1507 if (info->close_delay) {
1508 msleep_interruptible(jiffies_to_msecs(info->close_delay));
1510 wake_up_interruptible(&info->open_wait);
1512 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1513 wake_up_interruptible(&info->close_wait);
1514 local_irq_restore(flags);
1518 * rs_wait_until_sent() --- wait until the transmitter is empty
1520 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1522 struct async_struct * info = (struct async_struct *)tty->driver_data;
1523 unsigned long orig_jiffies, char_time;
1524 int lsr;
1526 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1527 return;
1529 if (info->xmit_fifo_size == 0)
1530 return; /* Just in case.... */
1532 orig_jiffies = jiffies;
1534 * Set the check interval to be 1/5 of the estimated time to
1535 * send a single character, and make it at least 1. The check
1536 * interval should also be less than the timeout.
1538 * Note: we have to use pretty tight timings here to satisfy
1539 * the NIST-PCTS.
1541 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1542 char_time = char_time / 5;
1543 if (char_time == 0)
1544 char_time = 1;
1545 if (timeout)
1546 char_time = min_t(unsigned long, char_time, timeout);
1548 * If the transmitter hasn't cleared in twice the approximate
1549 * amount of time to send the entire FIFO, it probably won't
1550 * ever clear. This assumes the UART isn't doing flow
1551 * control, which is currently the case. Hence, if it ever
1552 * takes longer than info->timeout, this is probably due to a
1553 * UART bug of some kind. So, we clamp the timeout parameter at
1554 * 2*info->timeout.
1556 if (!timeout || timeout > 2*info->timeout)
1557 timeout = 2*info->timeout;
1558 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1559 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1560 printk("jiff=%lu...", jiffies);
1561 #endif
1562 while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1563 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1564 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1565 #endif
1566 msleep_interruptible(jiffies_to_msecs(char_time));
1567 if (signal_pending(current))
1568 break;
1569 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1570 break;
1572 __set_current_state(TASK_RUNNING);
1573 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1574 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1575 #endif
1579 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1581 static void rs_hangup(struct tty_struct *tty)
1583 struct async_struct * info = (struct async_struct *)tty->driver_data;
1584 struct serial_state *state = info->state;
1586 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1587 return;
1589 state = info->state;
1591 rs_flush_buffer(tty);
1592 shutdown(info);
1593 info->event = 0;
1594 state->count = 0;
1595 info->flags &= ~ASYNC_NORMAL_ACTIVE;
1596 info->tty = NULL;
1597 wake_up_interruptible(&info->open_wait);
1601 * ------------------------------------------------------------
1602 * rs_open() and friends
1603 * ------------------------------------------------------------
1605 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1606 struct async_struct *info)
1608 #ifdef DECLARE_WAITQUEUE
1609 DECLARE_WAITQUEUE(wait, current);
1610 #else
1611 struct wait_queue wait = { current, NULL };
1612 #endif
1613 struct serial_state *state = info->state;
1614 int retval;
1615 int do_clocal = 0, extra_count = 0;
1616 unsigned long flags;
1619 * If the device is in the middle of being closed, then block
1620 * until it's done, and then try again.
1622 if (tty_hung_up_p(filp) ||
1623 (info->flags & ASYNC_CLOSING)) {
1624 if (info->flags & ASYNC_CLOSING)
1625 interruptible_sleep_on(&info->close_wait);
1626 #ifdef SERIAL_DO_RESTART
1627 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1628 -EAGAIN : -ERESTARTSYS);
1629 #else
1630 return -EAGAIN;
1631 #endif
1635 * If non-blocking mode is set, or the port is not enabled,
1636 * then make the check up front and then exit.
1638 if ((filp->f_flags & O_NONBLOCK) ||
1639 (tty->flags & (1 << TTY_IO_ERROR))) {
1640 info->flags |= ASYNC_NORMAL_ACTIVE;
1641 return 0;
1644 if (tty->termios->c_cflag & CLOCAL)
1645 do_clocal = 1;
1648 * Block waiting for the carrier detect and the line to become
1649 * free (i.e., not in use by the callout). While we are in
1650 * this loop, state->count is dropped by one, so that
1651 * rs_close() knows when to free things. We restore it upon
1652 * exit, either normal or abnormal.
1654 retval = 0;
1655 add_wait_queue(&info->open_wait, &wait);
1656 #ifdef SERIAL_DEBUG_OPEN
1657 printk("block_til_ready before block: ttys%d, count = %d\n",
1658 state->line, state->count);
1659 #endif
1660 local_irq_save(flags);
1661 if (!tty_hung_up_p(filp)) {
1662 extra_count = 1;
1663 state->count--;
1665 local_irq_restore(flags);
1666 info->blocked_open++;
1667 while (1) {
1668 local_irq_save(flags);
1669 if (tty->termios->c_cflag & CBAUD)
1670 rtsdtr_ctrl(SER_DTR|SER_RTS);
1671 local_irq_restore(flags);
1672 set_current_state(TASK_INTERRUPTIBLE);
1673 if (tty_hung_up_p(filp) ||
1674 !(info->flags & ASYNC_INITIALIZED)) {
1675 #ifdef SERIAL_DO_RESTART
1676 if (info->flags & ASYNC_HUP_NOTIFY)
1677 retval = -EAGAIN;
1678 else
1679 retval = -ERESTARTSYS;
1680 #else
1681 retval = -EAGAIN;
1682 #endif
1683 break;
1685 if (!(info->flags & ASYNC_CLOSING) &&
1686 (do_clocal || (!(ciab.pra & SER_DCD)) ))
1687 break;
1688 if (signal_pending(current)) {
1689 retval = -ERESTARTSYS;
1690 break;
1692 #ifdef SERIAL_DEBUG_OPEN
1693 printk("block_til_ready blocking: ttys%d, count = %d\n",
1694 info->line, state->count);
1695 #endif
1696 schedule();
1698 __set_current_state(TASK_RUNNING);
1699 remove_wait_queue(&info->open_wait, &wait);
1700 if (extra_count)
1701 state->count++;
1702 info->blocked_open--;
1703 #ifdef SERIAL_DEBUG_OPEN
1704 printk("block_til_ready after blocking: ttys%d, count = %d\n",
1705 info->line, state->count);
1706 #endif
1707 if (retval)
1708 return retval;
1709 info->flags |= ASYNC_NORMAL_ACTIVE;
1710 return 0;
1713 static int get_async_struct(int line, struct async_struct **ret_info)
1715 struct async_struct *info;
1716 struct serial_state *sstate;
1718 sstate = rs_table + line;
1719 sstate->count++;
1720 if (sstate->info) {
1721 *ret_info = sstate->info;
1722 return 0;
1724 info = kzalloc(sizeof(struct async_struct), GFP_KERNEL);
1725 if (!info) {
1726 sstate->count--;
1727 return -ENOMEM;
1729 #ifdef DECLARE_WAITQUEUE
1730 init_waitqueue_head(&info->open_wait);
1731 init_waitqueue_head(&info->close_wait);
1732 init_waitqueue_head(&info->delta_msr_wait);
1733 #endif
1734 info->magic = SERIAL_MAGIC;
1735 info->port = sstate->port;
1736 info->flags = sstate->flags;
1737 info->xmit_fifo_size = sstate->xmit_fifo_size;
1738 info->line = line;
1739 tasklet_init(&info->tlet, do_softint, (unsigned long)info);
1740 info->state = sstate;
1741 if (sstate->info) {
1742 kfree(info);
1743 *ret_info = sstate->info;
1744 return 0;
1746 *ret_info = sstate->info = info;
1747 return 0;
1751 * This routine is called whenever a serial port is opened. It
1752 * enables interrupts for a serial port, linking in its async structure into
1753 * the IRQ chain. It also performs the serial-specific
1754 * initialization for the tty structure.
1756 static int rs_open(struct tty_struct *tty, struct file * filp)
1758 struct async_struct *info;
1759 int retval, line;
1761 line = tty->index;
1762 if ((line < 0) || (line >= NR_PORTS)) {
1763 return -ENODEV;
1765 retval = get_async_struct(line, &info);
1766 if (retval) {
1767 return retval;
1769 tty->driver_data = info;
1770 info->tty = tty;
1771 if (serial_paranoia_check(info, tty->name, "rs_open"))
1772 return -ENODEV;
1774 #ifdef SERIAL_DEBUG_OPEN
1775 printk("rs_open %s, count = %d\n", tty->name, info->state->count);
1776 #endif
1777 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1780 * If the port is the middle of closing, bail out now
1782 if (tty_hung_up_p(filp) ||
1783 (info->flags & ASYNC_CLOSING)) {
1784 if (info->flags & ASYNC_CLOSING)
1785 interruptible_sleep_on(&info->close_wait);
1786 #ifdef SERIAL_DO_RESTART
1787 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1788 -EAGAIN : -ERESTARTSYS);
1789 #else
1790 return -EAGAIN;
1791 #endif
1795 * Start up serial port
1797 retval = startup(info);
1798 if (retval) {
1799 return retval;
1802 retval = block_til_ready(tty, filp, info);
1803 if (retval) {
1804 #ifdef SERIAL_DEBUG_OPEN
1805 printk("rs_open returning after block_til_ready with %d\n",
1806 retval);
1807 #endif
1808 return retval;
1811 #ifdef SERIAL_DEBUG_OPEN
1812 printk("rs_open %s successful...", tty->name);
1813 #endif
1814 return 0;
1818 * /proc fs routines....
1821 static inline int line_info(char *buf, struct serial_state *state)
1823 struct async_struct *info = state->info, scr_info;
1824 char stat_buf[30], control, status;
1825 int ret;
1826 unsigned long flags;
1828 ret = sprintf(buf, "%d: uart:amiga_builtin",state->line);
1831 * Figure out the current RS-232 lines
1833 if (!info) {
1834 info = &scr_info; /* This is just for serial_{in,out} */
1836 info->magic = SERIAL_MAGIC;
1837 info->flags = state->flags;
1838 info->quot = 0;
1839 info->tty = NULL;
1841 local_irq_save(flags);
1842 status = ciab.pra;
1843 control = info ? info->MCR : status;
1844 local_irq_restore(flags);
1846 stat_buf[0] = 0;
1847 stat_buf[1] = 0;
1848 if(!(control & SER_RTS))
1849 strcat(stat_buf, "|RTS");
1850 if(!(status & SER_CTS))
1851 strcat(stat_buf, "|CTS");
1852 if(!(control & SER_DTR))
1853 strcat(stat_buf, "|DTR");
1854 if(!(status & SER_DSR))
1855 strcat(stat_buf, "|DSR");
1856 if(!(status & SER_DCD))
1857 strcat(stat_buf, "|CD");
1859 if (info->quot) {
1860 ret += sprintf(buf+ret, " baud:%d",
1861 state->baud_base / info->quot);
1864 ret += sprintf(buf+ret, " tx:%d rx:%d",
1865 state->icount.tx, state->icount.rx);
1867 if (state->icount.frame)
1868 ret += sprintf(buf+ret, " fe:%d", state->icount.frame);
1870 if (state->icount.parity)
1871 ret += sprintf(buf+ret, " pe:%d", state->icount.parity);
1873 if (state->icount.brk)
1874 ret += sprintf(buf+ret, " brk:%d", state->icount.brk);
1876 if (state->icount.overrun)
1877 ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);
1880 * Last thing is the RS-232 status lines
1882 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1883 return ret;
1886 static int rs_read_proc(char *page, char **start, off_t off, int count,
1887 int *eof, void *data)
1889 int len = 0, l;
1890 off_t begin = 0;
1892 len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
1893 l = line_info(page + len, &rs_table[0]);
1894 len += l;
1895 if (len+begin > off+count)
1896 goto done;
1897 if (len+begin < off) {
1898 begin += len;
1899 len = 0;
1901 *eof = 1;
1902 done:
1903 if (off >= len+begin)
1904 return 0;
1905 *start = page + (off-begin);
1906 return ((count < begin+len-off) ? count : begin+len-off);
1910 * ---------------------------------------------------------------------
1911 * rs_init() and friends
1913 * rs_init() is called at boot-time to initialize the serial driver.
1914 * ---------------------------------------------------------------------
1918 * This routine prints out the appropriate serial driver version
1919 * number, and identifies which options were configured into this
1920 * driver.
1922 static void show_serial_version(void)
1924 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1928 static const struct tty_operations serial_ops = {
1929 .open = rs_open,
1930 .close = rs_close,
1931 .write = rs_write,
1932 .put_char = rs_put_char,
1933 .flush_chars = rs_flush_chars,
1934 .write_room = rs_write_room,
1935 .chars_in_buffer = rs_chars_in_buffer,
1936 .flush_buffer = rs_flush_buffer,
1937 .ioctl = rs_ioctl,
1938 .throttle = rs_throttle,
1939 .unthrottle = rs_unthrottle,
1940 .set_termios = rs_set_termios,
1941 .stop = rs_stop,
1942 .start = rs_start,
1943 .hangup = rs_hangup,
1944 .break_ctl = rs_break,
1945 .send_xchar = rs_send_xchar,
1946 .wait_until_sent = rs_wait_until_sent,
1947 .read_proc = rs_read_proc,
1948 .tiocmget = rs_tiocmget,
1949 .tiocmset = rs_tiocmset,
1953 * The serial driver boot-time initialization code!
1955 static int __init rs_init(void)
1957 unsigned long flags;
1958 struct serial_state * state;
1960 if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_SERIAL))
1961 return -ENODEV;
1963 serial_driver = alloc_tty_driver(1);
1964 if (!serial_driver)
1965 return -ENOMEM;
1968 * We request SERDAT and SERPER only, because the serial registers are
1969 * too spreaded over the custom register space
1971 if (!request_mem_region(CUSTOM_PHYSADDR+0x30, 4, "amiserial [Paula]"))
1972 return -EBUSY;
1974 IRQ_ports = NULL;
1976 show_serial_version();
1978 /* Initialize the tty_driver structure */
1980 serial_driver->owner = THIS_MODULE;
1981 serial_driver->driver_name = "amiserial";
1982 serial_driver->name = "ttyS";
1983 serial_driver->major = TTY_MAJOR;
1984 serial_driver->minor_start = 64;
1985 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1986 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1987 serial_driver->init_termios = tty_std_termios;
1988 serial_driver->init_termios.c_cflag =
1989 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1990 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1991 tty_set_operations(serial_driver, &serial_ops);
1993 if (tty_register_driver(serial_driver))
1994 panic("Couldn't register serial driver\n");
1996 state = rs_table;
1997 state->magic = SSTATE_MAGIC;
1998 state->port = (int)&custom.serdatr; /* Just to give it a value */
1999 state->line = 0;
2000 state->custom_divisor = 0;
2001 state->close_delay = 5*HZ/10;
2002 state->closing_wait = 30*HZ;
2003 state->icount.cts = state->icount.dsr =
2004 state->icount.rng = state->icount.dcd = 0;
2005 state->icount.rx = state->icount.tx = 0;
2006 state->icount.frame = state->icount.parity = 0;
2007 state->icount.overrun = state->icount.brk = 0;
2009 printk(KERN_INFO "ttyS%d is the amiga builtin serial port\n",
2010 state->line);
2012 /* Hardware set up */
2014 state->baud_base = amiga_colorclock;
2015 state->xmit_fifo_size = 1;
2017 local_irq_save(flags);
2019 /* set ISRs, and then disable the rx interrupts */
2020 request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
2021 request_irq(IRQ_AMIGA_RBF, ser_rx_int, IRQF_DISABLED, "serial RX", state);
2023 /* turn off Rx and Tx interrupts */
2024 custom.intena = IF_RBF | IF_TBE;
2025 mb();
2027 /* clear any pending interrupt */
2028 custom.intreq = IF_RBF | IF_TBE;
2029 mb();
2031 local_irq_restore(flags);
2034 * set the appropriate directions for the modem control flags,
2035 * and clear RTS and DTR
2037 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
2038 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
2040 return 0;
2043 static __exit void rs_exit(void)
2045 int error;
2046 struct async_struct *info = rs_table[0].info;
2048 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2049 tasklet_kill(&info->tlet);
2050 if ((error = tty_unregister_driver(serial_driver)))
2051 printk("SERIAL: failed to unregister serial driver (%d)\n",
2052 error);
2053 put_tty_driver(serial_driver);
2055 if (info) {
2056 rs_table[0].info = NULL;
2057 kfree(info);
2060 release_mem_region(CUSTOM_PHYSADDR+0x30, 4);
2063 module_init(rs_init)
2064 module_exit(rs_exit)
2068 * ------------------------------------------------------------
2069 * Serial console driver
2070 * ------------------------------------------------------------
2072 #ifdef CONFIG_SERIAL_CONSOLE
2074 static void amiga_serial_putc(char c)
2076 custom.serdat = (unsigned char)c | 0x100;
2077 while (!(custom.serdatr & 0x2000))
2078 barrier();
2082 * Print a string to the serial port trying not to disturb
2083 * any possible real use of the port...
2085 * The console must be locked when we get here.
2087 static void serial_console_write(struct console *co, const char *s,
2088 unsigned count)
2090 unsigned short intena = custom.intenar;
2092 custom.intena = IF_TBE;
2094 while (count--) {
2095 if (*s == '\n')
2096 amiga_serial_putc('\r');
2097 amiga_serial_putc(*s++);
2100 custom.intena = IF_SETCLR | (intena & IF_TBE);
2103 static struct tty_driver *serial_console_device(struct console *c, int *index)
2105 *index = 0;
2106 return serial_driver;
2109 static struct console sercons = {
2110 .name = "ttyS",
2111 .write = serial_console_write,
2112 .device = serial_console_device,
2113 .flags = CON_PRINTBUFFER,
2114 .index = -1,
2118 * Register console.
2120 static int __init amiserial_console_init(void)
2122 register_console(&sercons);
2123 return 0;
2125 console_initcall(amiserial_console_init);
2126 #endif
2128 MODULE_LICENSE("GPL");