Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / drivers / tty / amiserial.c
blob32d7ce430b02e21071d0360b026352d4bc16bdec
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Serial driver for the amiga builtin port.
5 * This code was created by taking serial.c version 4.30 from kernel
6 * release 2.3.22, replacing all hardware related stuff with the
7 * corresponding amiga hardware actions, and removing all irrelevant
8 * code. As a consequence, it uses many of the constants and names
9 * associated with the registers and bits of 16550 compatible UARTS -
10 * but only to keep track of status, etc in the state variables. It
11 * was done this was to make it easier to keep the code in line with
12 * (non hardware specific) changes to serial.c.
14 * The port is registered with the tty driver as minor device 64, and
15 * therefore other ports should should only use 65 upwards.
17 * Richard Lucock 28/12/99
19 * Copyright (C) 1991, 1992 Linus Torvalds
20 * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
21 * 1998, 1999 Theodore Ts'o
26 * Serial driver configuration section. Here are the various options:
28 * SERIAL_PARANOIA_CHECK
29 * Check the magic number for the async_structure where
30 * ever possible.
33 #include <linux/delay.h>
35 #undef SERIAL_PARANOIA_CHECK
37 /* Set of debugging defines */
39 #undef SERIAL_DEBUG_INTR
40 #undef SERIAL_DEBUG_OPEN
41 #undef SERIAL_DEBUG_FLOW
42 #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
44 /* Sanity checks */
46 #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
47 #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
48 tty->name, (info->tport.flags), serial_driver->refcount,info->count,tty->count,s)
49 #else
50 #define DBG_CNT(s)
51 #endif
54 * End of serial driver configuration section.
57 #include <linux/module.h>
59 #include <linux/types.h>
60 #include <linux/serial.h>
61 #include <linux/serial_reg.h>
62 static char *serial_version = "4.30";
64 #include <linux/errno.h>
65 #include <linux/signal.h>
66 #include <linux/sched.h>
67 #include <linux/kernel.h>
68 #include <linux/timer.h>
69 #include <linux/interrupt.h>
70 #include <linux/tty.h>
71 #include <linux/tty_flip.h>
72 #include <linux/circ_buf.h>
73 #include <linux/console.h>
74 #include <linux/major.h>
75 #include <linux/string.h>
76 #include <linux/fcntl.h>
77 #include <linux/ptrace.h>
78 #include <linux/ioport.h>
79 #include <linux/mm.h>
80 #include <linux/seq_file.h>
81 #include <linux/slab.h>
82 #include <linux/init.h>
83 #include <linux/bitops.h>
84 #include <linux/platform_device.h>
86 #include <asm/setup.h>
89 #include <asm/irq.h>
91 #include <asm/amigahw.h>
92 #include <asm/amigaints.h>
94 struct serial_state {
95 struct tty_port tport;
96 struct circ_buf xmit;
97 struct async_icount icount;
99 unsigned long port;
100 int baud_base;
101 int xmit_fifo_size;
102 int custom_divisor;
103 int read_status_mask;
104 int ignore_status_mask;
105 int timeout;
106 int quot;
107 int IER; /* Interrupt Enable Register */
108 int MCR; /* Modem control register */
109 int x_char; /* xon/xoff character */
112 #define custom amiga_custom
113 static char *serial_name = "Amiga-builtin serial driver";
115 static struct tty_driver *serial_driver;
117 /* number of characters left in xmit buffer before we ask for more */
118 #define WAKEUP_CHARS 256
120 static unsigned char current_ctl_bits;
122 static void change_speed(struct tty_struct *tty, struct serial_state *info,
123 struct ktermios *old);
124 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
127 static struct serial_state rs_table[1];
129 #define NR_PORTS ARRAY_SIZE(rs_table)
131 #include <linux/uaccess.h>
133 #define serial_isroot() (capable(CAP_SYS_ADMIN))
136 static inline int serial_paranoia_check(struct serial_state *info,
137 char *name, const char *routine)
139 #ifdef SERIAL_PARANOIA_CHECK
140 static const char *badmagic =
141 "Warning: bad magic number for serial struct (%s) in %s\n";
142 static const char *badinfo =
143 "Warning: null async_struct for (%s) in %s\n";
145 if (!info) {
146 printk(badinfo, name, routine);
147 return 1;
149 if (info->magic != SERIAL_MAGIC) {
150 printk(badmagic, name, routine);
151 return 1;
153 #endif
154 return 0;
157 /* some serial hardware definitions */
158 #define SDR_OVRUN (1<<15)
159 #define SDR_RBF (1<<14)
160 #define SDR_TBE (1<<13)
161 #define SDR_TSRE (1<<12)
163 #define SERPER_PARENB (1<<15)
165 #define AC_SETCLR (1<<15)
166 #define AC_UARTBRK (1<<11)
168 #define SER_DTR (1<<7)
169 #define SER_RTS (1<<6)
170 #define SER_DCD (1<<5)
171 #define SER_CTS (1<<4)
172 #define SER_DSR (1<<3)
174 static __inline__ void rtsdtr_ctrl(int bits)
176 ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
180 * ------------------------------------------------------------
181 * rs_stop() and rs_start()
183 * This routines are called before setting or resetting tty->stopped.
184 * They enable or disable transmitter interrupts, as necessary.
185 * ------------------------------------------------------------
187 static void rs_stop(struct tty_struct *tty)
189 struct serial_state *info = tty->driver_data;
190 unsigned long flags;
192 if (serial_paranoia_check(info, tty->name, "rs_stop"))
193 return;
195 local_irq_save(flags);
196 if (info->IER & UART_IER_THRI) {
197 info->IER &= ~UART_IER_THRI;
198 /* disable Tx interrupt and remove any pending interrupts */
199 custom.intena = IF_TBE;
200 mb();
201 custom.intreq = IF_TBE;
202 mb();
204 local_irq_restore(flags);
207 static void rs_start(struct tty_struct *tty)
209 struct serial_state *info = tty->driver_data;
210 unsigned long flags;
212 if (serial_paranoia_check(info, tty->name, "rs_start"))
213 return;
215 local_irq_save(flags);
216 if (info->xmit.head != info->xmit.tail
217 && info->xmit.buf
218 && !(info->IER & UART_IER_THRI)) {
219 info->IER |= UART_IER_THRI;
220 custom.intena = IF_SETCLR | IF_TBE;
221 mb();
222 /* set a pending Tx Interrupt, transmitter should restart now */
223 custom.intreq = IF_SETCLR | IF_TBE;
224 mb();
226 local_irq_restore(flags);
230 * ----------------------------------------------------------------------
232 * Here starts the interrupt handling routines. All of the following
233 * subroutines are declared as inline and are folded into
234 * rs_interrupt(). They were separated out for readability's sake.
236 * Note: rs_interrupt() is a "fast" interrupt, which means that it
237 * runs with interrupts turned off. People who may want to modify
238 * rs_interrupt() should try to keep the interrupt handler as fast as
239 * possible. After you are done making modifications, it is not a bad
240 * idea to do:
242 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
244 * and look at the resulting assemble code in serial.s.
246 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
247 * -----------------------------------------------------------------------
250 static void receive_chars(struct serial_state *info)
252 int status;
253 int serdatr;
254 unsigned char ch, flag;
255 struct async_icount *icount;
256 int oe = 0;
258 icount = &info->icount;
260 status = UART_LSR_DR; /* We obviously have a character! */
261 serdatr = custom.serdatr;
262 mb();
263 custom.intreq = IF_RBF;
264 mb();
266 if((serdatr & 0x1ff) == 0)
267 status |= UART_LSR_BI;
268 if(serdatr & SDR_OVRUN)
269 status |= UART_LSR_OE;
271 ch = serdatr & 0xff;
272 icount->rx++;
274 #ifdef SERIAL_DEBUG_INTR
275 printk("DR%02x:%02x...", ch, status);
276 #endif
277 flag = TTY_NORMAL;
280 * We don't handle parity or frame errors - but I have left
281 * the code in, since I'm not sure that the errors can't be
282 * detected.
285 if (status & (UART_LSR_BI | UART_LSR_PE |
286 UART_LSR_FE | UART_LSR_OE)) {
288 * For statistics only
290 if (status & UART_LSR_BI) {
291 status &= ~(UART_LSR_FE | UART_LSR_PE);
292 icount->brk++;
293 } else if (status & UART_LSR_PE)
294 icount->parity++;
295 else if (status & UART_LSR_FE)
296 icount->frame++;
297 if (status & UART_LSR_OE)
298 icount->overrun++;
301 * Now check to see if character should be
302 * ignored, and mask off conditions which
303 * should be ignored.
305 if (status & info->ignore_status_mask)
306 goto out;
308 status &= info->read_status_mask;
310 if (status & (UART_LSR_BI)) {
311 #ifdef SERIAL_DEBUG_INTR
312 printk("handling break....");
313 #endif
314 flag = TTY_BREAK;
315 if (info->tport.flags & ASYNC_SAK)
316 do_SAK(info->tport.tty);
317 } else if (status & UART_LSR_PE)
318 flag = TTY_PARITY;
319 else if (status & UART_LSR_FE)
320 flag = TTY_FRAME;
321 if (status & UART_LSR_OE) {
323 * Overrun is special, since it's
324 * reported immediately, and doesn't
325 * affect the current character
327 oe = 1;
330 tty_insert_flip_char(&info->tport, ch, flag);
331 if (oe == 1)
332 tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN);
333 tty_flip_buffer_push(&info->tport);
334 out:
335 return;
338 static void transmit_chars(struct serial_state *info)
340 custom.intreq = IF_TBE;
341 mb();
342 if (info->x_char) {
343 custom.serdat = info->x_char | 0x100;
344 mb();
345 info->icount.tx++;
346 info->x_char = 0;
347 return;
349 if (info->xmit.head == info->xmit.tail
350 || info->tport.tty->stopped
351 || info->tport.tty->hw_stopped) {
352 info->IER &= ~UART_IER_THRI;
353 custom.intena = IF_TBE;
354 mb();
355 return;
358 custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
359 mb();
360 info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
361 info->icount.tx++;
363 if (CIRC_CNT(info->xmit.head,
364 info->xmit.tail,
365 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
366 tty_wakeup(info->tport.tty);
368 #ifdef SERIAL_DEBUG_INTR
369 printk("THRE...");
370 #endif
371 if (info->xmit.head == info->xmit.tail) {
372 custom.intena = IF_TBE;
373 mb();
374 info->IER &= ~UART_IER_THRI;
378 static void check_modem_status(struct serial_state *info)
380 struct tty_port *port = &info->tport;
381 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
382 unsigned char dstatus;
383 struct async_icount *icount;
385 /* Determine bits that have changed */
386 dstatus = status ^ current_ctl_bits;
387 current_ctl_bits = status;
389 if (dstatus) {
390 icount = &info->icount;
391 /* update input line counters */
392 if (dstatus & SER_DSR)
393 icount->dsr++;
394 if (dstatus & SER_DCD) {
395 icount->dcd++;
397 if (dstatus & SER_CTS)
398 icount->cts++;
399 wake_up_interruptible(&port->delta_msr_wait);
402 if (tty_port_check_carrier(port) && (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(&port->open_wait);
409 else {
410 #ifdef SERIAL_DEBUG_OPEN
411 printk("doing serial hangup...");
412 #endif
413 if (port->tty)
414 tty_hangup(port->tty);
417 if (tty_port_cts_enabled(port)) {
418 if (port->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 port->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 tty_wakeup(port->tty);
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 port->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 serial_state *info = data;
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 serial_state *info = dev_id;
467 #ifdef SERIAL_DEBUG_INTR
468 printk("ser_rx_int...");
469 #endif
471 if (!info->tport.tty)
472 return IRQ_NONE;
474 receive_chars(info);
475 #ifdef SERIAL_DEBUG_INTR
476 printk("end.\n");
477 #endif
478 return IRQ_HANDLED;
481 static irqreturn_t ser_tx_int(int irq, void *dev_id)
483 struct serial_state *info = dev_id;
485 if (custom.serdatr & SDR_TBE) {
486 #ifdef SERIAL_DEBUG_INTR
487 printk("ser_tx_int...");
488 #endif
490 if (!info->tport.tty)
491 return IRQ_NONE;
493 transmit_chars(info);
494 #ifdef SERIAL_DEBUG_INTR
495 printk("end.\n");
496 #endif
498 return IRQ_HANDLED;
502 * -------------------------------------------------------------------
503 * Here ends the serial interrupt routines.
504 * -------------------------------------------------------------------
508 * ---------------------------------------------------------------
509 * Low level utility subroutines for the serial driver: routines to
510 * figure out the appropriate timeout for an interrupt chain, routines
511 * to initialize and startup a serial port, and routines to shutdown a
512 * serial port. Useful stuff like that.
513 * ---------------------------------------------------------------
516 static int startup(struct tty_struct *tty, struct serial_state *info)
518 struct tty_port *port = &info->tport;
519 unsigned long flags;
520 int retval=0;
521 unsigned long page;
523 page = get_zeroed_page(GFP_KERNEL);
524 if (!page)
525 return -ENOMEM;
527 local_irq_save(flags);
529 if (tty_port_initialized(port)) {
530 free_page(page);
531 goto errout;
534 if (info->xmit.buf)
535 free_page(page);
536 else
537 info->xmit.buf = (unsigned char *) page;
539 #ifdef SERIAL_DEBUG_OPEN
540 printk("starting up ttys%d ...", info->line);
541 #endif
543 /* Clear anything in the input buffer */
545 custom.intreq = IF_RBF;
546 mb();
548 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
549 if (retval) {
550 if (serial_isroot()) {
551 set_bit(TTY_IO_ERROR, &tty->flags);
552 retval = 0;
554 goto errout;
557 /* enable both Rx and Tx interrupts */
558 custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
559 mb();
560 info->IER = UART_IER_MSI;
562 /* remember current state of the DCD and CTS bits */
563 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
565 info->MCR = 0;
566 if (C_BAUD(tty))
567 info->MCR = SER_DTR | SER_RTS;
568 rtsdtr_ctrl(info->MCR);
570 clear_bit(TTY_IO_ERROR, &tty->flags);
571 info->xmit.head = info->xmit.tail = 0;
574 * and set the speed of the serial port
576 change_speed(tty, info, NULL);
578 tty_port_set_initialized(port, 1);
579 local_irq_restore(flags);
580 return 0;
582 errout:
583 local_irq_restore(flags);
584 return retval;
588 * This routine will shutdown a serial port; interrupts are disabled, and
589 * DTR is dropped if the hangup on close termio flag is on.
591 static void shutdown(struct tty_struct *tty, struct serial_state *info)
593 unsigned long flags;
594 struct serial_state *state;
596 if (!tty_port_initialized(&info->tport))
597 return;
599 state = info;
601 #ifdef SERIAL_DEBUG_OPEN
602 printk("Shutting down serial port %d ....\n", info->line);
603 #endif
605 local_irq_save(flags); /* Disable interrupts */
608 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
609 * here so the queue might never be waken up
611 wake_up_interruptible(&info->tport.delta_msr_wait);
614 * Free the IRQ, if necessary
616 free_irq(IRQ_AMIGA_VERTB, info);
618 if (info->xmit.buf) {
619 free_page((unsigned long) info->xmit.buf);
620 info->xmit.buf = NULL;
623 info->IER = 0;
624 custom.intena = IF_RBF | IF_TBE;
625 mb();
627 /* disable break condition */
628 custom.adkcon = AC_UARTBRK;
629 mb();
631 if (C_HUPCL(tty))
632 info->MCR &= ~(SER_DTR|SER_RTS);
633 rtsdtr_ctrl(info->MCR);
635 set_bit(TTY_IO_ERROR, &tty->flags);
637 tty_port_set_initialized(&info->tport, 0);
638 local_irq_restore(flags);
643 * This routine is called to set the UART divisor registers to match
644 * the specified baud rate for a serial port.
646 static void change_speed(struct tty_struct *tty, struct serial_state *info,
647 struct ktermios *old_termios)
649 struct tty_port *port = &info->tport;
650 int quot = 0, baud_base, baud;
651 unsigned cflag, cval = 0;
652 int bits;
653 unsigned long flags;
655 cflag = tty->termios.c_cflag;
657 /* Byte size is always 8 bits plus parity bit if requested */
659 cval = 3; bits = 10;
660 if (cflag & CSTOPB) {
661 cval |= 0x04;
662 bits++;
664 if (cflag & PARENB) {
665 cval |= UART_LCR_PARITY;
666 bits++;
668 if (!(cflag & PARODD))
669 cval |= UART_LCR_EPAR;
670 #ifdef CMSPAR
671 if (cflag & CMSPAR)
672 cval |= UART_LCR_SPAR;
673 #endif
675 /* Determine divisor based on baud rate */
676 baud = tty_get_baud_rate(tty);
677 if (!baud)
678 baud = 9600; /* B0 transition handled in rs_set_termios */
679 baud_base = info->baud_base;
680 if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
681 quot = info->custom_divisor;
682 else {
683 if (baud == 134)
684 /* Special case since 134 is really 134.5 */
685 quot = (2*baud_base / 269);
686 else if (baud)
687 quot = baud_base / baud;
689 /* If the quotient is zero refuse the change */
690 if (!quot && old_termios) {
691 /* FIXME: Will need updating for new tty in the end */
692 tty->termios.c_cflag &= ~CBAUD;
693 tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD);
694 baud = tty_get_baud_rate(tty);
695 if (!baud)
696 baud = 9600;
697 if (baud == 38400 &&
698 (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
699 quot = info->custom_divisor;
700 else {
701 if (baud == 134)
702 /* Special case since 134 is really 134.5 */
703 quot = (2*baud_base / 269);
704 else if (baud)
705 quot = baud_base / baud;
708 /* As a last resort, if the quotient is zero, default to 9600 bps */
709 if (!quot)
710 quot = baud_base / 9600;
711 info->quot = quot;
712 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
713 info->timeout += HZ/50; /* Add .02 seconds of slop */
715 /* CTS flow control flag and modem status interrupts */
716 info->IER &= ~UART_IER_MSI;
717 if (port->flags & ASYNC_HARDPPS_CD)
718 info->IER |= UART_IER_MSI;
719 tty_port_set_cts_flow(port, cflag & CRTSCTS);
720 if (cflag & CRTSCTS)
721 info->IER |= UART_IER_MSI;
722 tty_port_set_check_carrier(port, ~cflag & CLOCAL);
723 if (~cflag & CLOCAL)
724 info->IER |= UART_IER_MSI;
725 /* TBD:
726 * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
730 * Set up parity check flag
733 info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
734 if (I_INPCK(tty))
735 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
736 if (I_BRKINT(tty) || I_PARMRK(tty))
737 info->read_status_mask |= UART_LSR_BI;
740 * Characters to ignore
742 info->ignore_status_mask = 0;
743 if (I_IGNPAR(tty))
744 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
745 if (I_IGNBRK(tty)) {
746 info->ignore_status_mask |= UART_LSR_BI;
748 * If we're ignore parity and break indicators, ignore
749 * overruns too. (For real raw support).
751 if (I_IGNPAR(tty))
752 info->ignore_status_mask |= UART_LSR_OE;
755 * !!! ignore all characters if CREAD is not set
757 if ((cflag & CREAD) == 0)
758 info->ignore_status_mask |= UART_LSR_DR;
759 local_irq_save(flags);
762 short serper;
764 /* Set up the baud rate */
765 serper = quot - 1;
767 /* Enable or disable parity bit */
769 if(cval & UART_LCR_PARITY)
770 serper |= (SERPER_PARENB);
772 custom.serper = serper;
773 mb();
776 local_irq_restore(flags);
779 static int rs_put_char(struct tty_struct *tty, unsigned char ch)
781 struct serial_state *info;
782 unsigned long flags;
784 info = tty->driver_data;
786 if (serial_paranoia_check(info, tty->name, "rs_put_char"))
787 return 0;
789 if (!info->xmit.buf)
790 return 0;
792 local_irq_save(flags);
793 if (CIRC_SPACE(info->xmit.head,
794 info->xmit.tail,
795 SERIAL_XMIT_SIZE) == 0) {
796 local_irq_restore(flags);
797 return 0;
800 info->xmit.buf[info->xmit.head++] = ch;
801 info->xmit.head &= SERIAL_XMIT_SIZE-1;
802 local_irq_restore(flags);
803 return 1;
806 static void rs_flush_chars(struct tty_struct *tty)
808 struct serial_state *info = tty->driver_data;
809 unsigned long flags;
811 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
812 return;
814 if (info->xmit.head == info->xmit.tail
815 || tty->stopped
816 || tty->hw_stopped
817 || !info->xmit.buf)
818 return;
820 local_irq_save(flags);
821 info->IER |= UART_IER_THRI;
822 custom.intena = IF_SETCLR | IF_TBE;
823 mb();
824 /* set a pending Tx Interrupt, transmitter should restart now */
825 custom.intreq = IF_SETCLR | IF_TBE;
826 mb();
827 local_irq_restore(flags);
830 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
832 int c, ret = 0;
833 struct serial_state *info = tty->driver_data;
834 unsigned long flags;
836 if (serial_paranoia_check(info, tty->name, "rs_write"))
837 return 0;
839 if (!info->xmit.buf)
840 return 0;
842 local_irq_save(flags);
843 while (1) {
844 c = CIRC_SPACE_TO_END(info->xmit.head,
845 info->xmit.tail,
846 SERIAL_XMIT_SIZE);
847 if (count < c)
848 c = count;
849 if (c <= 0) {
850 break;
852 memcpy(info->xmit.buf + info->xmit.head, buf, c);
853 info->xmit.head = ((info->xmit.head + c) &
854 (SERIAL_XMIT_SIZE-1));
855 buf += c;
856 count -= c;
857 ret += c;
859 local_irq_restore(flags);
861 if (info->xmit.head != info->xmit.tail
862 && !tty->stopped
863 && !tty->hw_stopped
864 && !(info->IER & UART_IER_THRI)) {
865 info->IER |= UART_IER_THRI;
866 local_irq_disable();
867 custom.intena = IF_SETCLR | IF_TBE;
868 mb();
869 /* set a pending Tx Interrupt, transmitter should restart now */
870 custom.intreq = IF_SETCLR | IF_TBE;
871 mb();
872 local_irq_restore(flags);
874 return ret;
877 static int rs_write_room(struct tty_struct *tty)
879 struct serial_state *info = tty->driver_data;
881 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
882 return 0;
883 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
886 static int rs_chars_in_buffer(struct tty_struct *tty)
888 struct serial_state *info = tty->driver_data;
890 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
891 return 0;
892 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
895 static void rs_flush_buffer(struct tty_struct *tty)
897 struct serial_state *info = tty->driver_data;
898 unsigned long flags;
900 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
901 return;
902 local_irq_save(flags);
903 info->xmit.head = info->xmit.tail = 0;
904 local_irq_restore(flags);
905 tty_wakeup(tty);
909 * This function is used to send a high-priority XON/XOFF character to
910 * the device
912 static void rs_send_xchar(struct tty_struct *tty, char ch)
914 struct serial_state *info = tty->driver_data;
915 unsigned long flags;
917 if (serial_paranoia_check(info, tty->name, "rs_send_xchar"))
918 return;
920 info->x_char = ch;
921 if (ch) {
922 /* Make sure transmit interrupts are on */
924 /* Check this ! */
925 local_irq_save(flags);
926 if(!(custom.intenar & IF_TBE)) {
927 custom.intena = IF_SETCLR | IF_TBE;
928 mb();
929 /* set a pending Tx Interrupt, transmitter should restart now */
930 custom.intreq = IF_SETCLR | IF_TBE;
931 mb();
933 local_irq_restore(flags);
935 info->IER |= UART_IER_THRI;
940 * ------------------------------------------------------------
941 * rs_throttle()
943 * This routine is called by the upper-layer tty layer to signal that
944 * incoming characters should be throttled.
945 * ------------------------------------------------------------
947 static void rs_throttle(struct tty_struct * tty)
949 struct serial_state *info = tty->driver_data;
950 unsigned long flags;
951 #ifdef SERIAL_DEBUG_THROTTLE
952 printk("throttle %s ....\n", tty_name(tty));
953 #endif
955 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
956 return;
958 if (I_IXOFF(tty))
959 rs_send_xchar(tty, STOP_CHAR(tty));
961 if (C_CRTSCTS(tty))
962 info->MCR &= ~SER_RTS;
964 local_irq_save(flags);
965 rtsdtr_ctrl(info->MCR);
966 local_irq_restore(flags);
969 static void rs_unthrottle(struct tty_struct * tty)
971 struct serial_state *info = tty->driver_data;
972 unsigned long flags;
973 #ifdef SERIAL_DEBUG_THROTTLE
974 printk("unthrottle %s ....\n", tty_name(tty));
975 #endif
977 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
978 return;
980 if (I_IXOFF(tty)) {
981 if (info->x_char)
982 info->x_char = 0;
983 else
984 rs_send_xchar(tty, START_CHAR(tty));
986 if (C_CRTSCTS(tty))
987 info->MCR |= SER_RTS;
988 local_irq_save(flags);
989 rtsdtr_ctrl(info->MCR);
990 local_irq_restore(flags);
994 * ------------------------------------------------------------
995 * rs_ioctl() and friends
996 * ------------------------------------------------------------
999 static int get_serial_info(struct tty_struct *tty, struct serial_state *state,
1000 struct serial_struct __user * retinfo)
1002 struct serial_struct tmp;
1004 memset(&tmp, 0, sizeof(tmp));
1005 tty_lock(tty);
1006 tmp.line = tty->index;
1007 tmp.port = state->port;
1008 tmp.flags = state->tport.flags;
1009 tmp.xmit_fifo_size = state->xmit_fifo_size;
1010 tmp.baud_base = state->baud_base;
1011 tmp.close_delay = state->tport.close_delay;
1012 tmp.closing_wait = state->tport.closing_wait;
1013 tmp.custom_divisor = state->custom_divisor;
1014 tty_unlock(tty);
1015 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1016 return -EFAULT;
1017 return 0;
1020 static int set_serial_info(struct tty_struct *tty, struct serial_state *state,
1021 struct serial_struct __user * new_info)
1023 struct tty_port *port = &state->tport;
1024 struct serial_struct new_serial;
1025 bool change_spd;
1026 int retval = 0;
1028 if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1029 return -EFAULT;
1031 tty_lock(tty);
1032 change_spd = ((new_serial.flags ^ port->flags) & ASYNC_SPD_MASK) ||
1033 new_serial.custom_divisor != state->custom_divisor;
1034 if (new_serial.irq || new_serial.port != state->port ||
1035 new_serial.xmit_fifo_size != state->xmit_fifo_size) {
1036 tty_unlock(tty);
1037 return -EINVAL;
1040 if (!serial_isroot()) {
1041 if ((new_serial.baud_base != state->baud_base) ||
1042 (new_serial.close_delay != port->close_delay) ||
1043 (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1044 ((new_serial.flags & ~ASYNC_USR_MASK) !=
1045 (port->flags & ~ASYNC_USR_MASK))) {
1046 tty_unlock(tty);
1047 return -EPERM;
1049 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
1050 (new_serial.flags & ASYNC_USR_MASK));
1051 state->custom_divisor = new_serial.custom_divisor;
1052 goto check_and_exit;
1055 if (new_serial.baud_base < 9600) {
1056 tty_unlock(tty);
1057 return -EINVAL;
1061 * OK, past this point, all the error checking has been done.
1062 * At this point, we start making changes.....
1065 state->baud_base = new_serial.baud_base;
1066 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1067 (new_serial.flags & ASYNC_FLAGS));
1068 state->custom_divisor = new_serial.custom_divisor;
1069 port->close_delay = new_serial.close_delay * HZ/100;
1070 port->closing_wait = new_serial.closing_wait * HZ/100;
1071 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1073 check_and_exit:
1074 if (tty_port_initialized(port)) {
1075 if (change_spd) {
1076 /* warn about deprecation unless clearing */
1077 if (new_serial.flags & ASYNC_SPD_MASK)
1078 dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n");
1079 change_speed(tty, state, NULL);
1081 } else
1082 retval = startup(tty, state);
1083 tty_unlock(tty);
1084 return retval;
1089 * get_lsr_info - get line status register info
1091 * Purpose: Let user call ioctl() to get info when the UART physically
1092 * is emptied. On bus types like RS485, the transmitter must
1093 * release the bus after transmitting. This must be done when
1094 * the transmit shift register is empty, not be done when the
1095 * transmit holding register is empty. This functionality
1096 * allows an RS485 driver to be written in user space.
1098 static int get_lsr_info(struct serial_state *info, unsigned int __user *value)
1100 unsigned char status;
1101 unsigned int result;
1102 unsigned long flags;
1104 local_irq_save(flags);
1105 status = custom.serdatr;
1106 mb();
1107 local_irq_restore(flags);
1108 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1109 if (copy_to_user(value, &result, sizeof(int)))
1110 return -EFAULT;
1111 return 0;
1115 static int rs_tiocmget(struct tty_struct *tty)
1117 struct serial_state *info = tty->driver_data;
1118 unsigned char control, status;
1119 unsigned long flags;
1121 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1122 return -ENODEV;
1123 if (tty_io_error(tty))
1124 return -EIO;
1126 control = info->MCR;
1127 local_irq_save(flags);
1128 status = ciab.pra;
1129 local_irq_restore(flags);
1130 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1131 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1132 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1133 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1134 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1137 static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
1138 unsigned int clear)
1140 struct serial_state *info = tty->driver_data;
1141 unsigned long flags;
1143 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1144 return -ENODEV;
1145 if (tty_io_error(tty))
1146 return -EIO;
1148 local_irq_save(flags);
1149 if (set & TIOCM_RTS)
1150 info->MCR |= SER_RTS;
1151 if (set & TIOCM_DTR)
1152 info->MCR |= SER_DTR;
1153 if (clear & TIOCM_RTS)
1154 info->MCR &= ~SER_RTS;
1155 if (clear & TIOCM_DTR)
1156 info->MCR &= ~SER_DTR;
1157 rtsdtr_ctrl(info->MCR);
1158 local_irq_restore(flags);
1159 return 0;
1163 * rs_break() --- routine which turns the break handling on or off
1165 static int rs_break(struct tty_struct *tty, int break_state)
1167 struct serial_state *info = tty->driver_data;
1168 unsigned long flags;
1170 if (serial_paranoia_check(info, tty->name, "rs_break"))
1171 return -EINVAL;
1173 local_irq_save(flags);
1174 if (break_state == -1)
1175 custom.adkcon = AC_SETCLR | AC_UARTBRK;
1176 else
1177 custom.adkcon = AC_UARTBRK;
1178 mb();
1179 local_irq_restore(flags);
1180 return 0;
1184 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1185 * Return: write counters to the user passed counter struct
1186 * NB: both 1->0 and 0->1 transitions are counted except for
1187 * RI where only 0->1 is counted.
1189 static int rs_get_icount(struct tty_struct *tty,
1190 struct serial_icounter_struct *icount)
1192 struct serial_state *info = tty->driver_data;
1193 struct async_icount cnow;
1194 unsigned long flags;
1196 local_irq_save(flags);
1197 cnow = info->icount;
1198 local_irq_restore(flags);
1199 icount->cts = cnow.cts;
1200 icount->dsr = cnow.dsr;
1201 icount->rng = cnow.rng;
1202 icount->dcd = cnow.dcd;
1203 icount->rx = cnow.rx;
1204 icount->tx = cnow.tx;
1205 icount->frame = cnow.frame;
1206 icount->overrun = cnow.overrun;
1207 icount->parity = cnow.parity;
1208 icount->brk = cnow.brk;
1209 icount->buf_overrun = cnow.buf_overrun;
1211 return 0;
1214 static int rs_ioctl(struct tty_struct *tty,
1215 unsigned int cmd, unsigned long arg)
1217 struct serial_state *info = tty->driver_data;
1218 struct async_icount cprev, cnow; /* kernel counter temps */
1219 void __user *argp = (void __user *)arg;
1220 unsigned long flags;
1221 DEFINE_WAIT(wait);
1222 int ret;
1224 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1225 return -ENODEV;
1227 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1228 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1229 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1230 if (tty_io_error(tty))
1231 return -EIO;
1234 switch (cmd) {
1235 case TIOCGSERIAL:
1236 return get_serial_info(tty, info, argp);
1237 case TIOCSSERIAL:
1238 return set_serial_info(tty, info, argp);
1239 case TIOCSERCONFIG:
1240 return 0;
1242 case TIOCSERGETLSR: /* Get line status register */
1243 return get_lsr_info(info, argp);
1245 case TIOCSERGSTRUCT:
1246 if (copy_to_user(argp,
1247 info, sizeof(struct serial_state)))
1248 return -EFAULT;
1249 return 0;
1252 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1253 * - mask passed in arg for lines of interest
1254 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1255 * Caller should use TIOCGICOUNT to see which one it was
1257 case TIOCMIWAIT:
1258 local_irq_save(flags);
1259 /* note the counters on entry */
1260 cprev = info->icount;
1261 local_irq_restore(flags);
1262 while (1) {
1263 prepare_to_wait(&info->tport.delta_msr_wait,
1264 &wait, TASK_INTERRUPTIBLE);
1265 local_irq_save(flags);
1266 cnow = info->icount; /* atomic copy */
1267 local_irq_restore(flags);
1268 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1269 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
1270 ret = -EIO; /* no change => error */
1271 break;
1273 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1274 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1275 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1276 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1277 ret = 0;
1278 break;
1280 schedule();
1281 /* see if a signal did it */
1282 if (signal_pending(current)) {
1283 ret = -ERESTARTSYS;
1284 break;
1286 cprev = cnow;
1288 finish_wait(&info->tport.delta_msr_wait, &wait);
1289 return ret;
1291 case TIOCSERGWILD:
1292 case TIOCSERSWILD:
1293 /* "setserial -W" is called in Debian boot */
1294 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1295 return 0;
1297 default:
1298 return -ENOIOCTLCMD;
1300 return 0;
1303 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1305 struct serial_state *info = tty->driver_data;
1306 unsigned long flags;
1307 unsigned int cflag = tty->termios.c_cflag;
1309 change_speed(tty, info, old_termios);
1311 /* Handle transition to B0 status */
1312 if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) {
1313 info->MCR &= ~(SER_DTR|SER_RTS);
1314 local_irq_save(flags);
1315 rtsdtr_ctrl(info->MCR);
1316 local_irq_restore(flags);
1319 /* Handle transition away from B0 status */
1320 if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
1321 info->MCR |= SER_DTR;
1322 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
1323 info->MCR |= SER_RTS;
1324 local_irq_save(flags);
1325 rtsdtr_ctrl(info->MCR);
1326 local_irq_restore(flags);
1329 /* Handle turning off CRTSCTS */
1330 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1331 tty->hw_stopped = 0;
1332 rs_start(tty);
1335 #if 0
1337 * No need to wake up processes in open wait, since they
1338 * sample the CLOCAL flag once, and don't recheck it.
1339 * XXX It's not clear whether the current behavior is correct
1340 * or not. Hence, this may change.....
1342 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1343 wake_up_interruptible(&info->open_wait);
1344 #endif
1348 * ------------------------------------------------------------
1349 * rs_close()
1351 * This routine is called when the serial port gets closed. First, we
1352 * wait for the last remaining data to be sent. Then, we unlink its
1353 * async structure from the interrupt chain if necessary, and we free
1354 * that IRQ if nothing is left in the chain.
1355 * ------------------------------------------------------------
1357 static void rs_close(struct tty_struct *tty, struct file * filp)
1359 struct serial_state *state = tty->driver_data;
1360 struct tty_port *port = &state->tport;
1362 if (serial_paranoia_check(state, tty->name, "rs_close"))
1363 return;
1365 if (tty_port_close_start(port, tty, filp) == 0)
1366 return;
1369 * At this point we stop accepting input. To do this, we
1370 * disable the receive line status interrupts, and tell the
1371 * interrupt driver to stop checking the data ready bit in the
1372 * line status register.
1374 state->read_status_mask &= ~UART_LSR_DR;
1375 if (tty_port_initialized(port)) {
1376 /* disable receive interrupts */
1377 custom.intena = IF_RBF;
1378 mb();
1379 /* clear any pending receive interrupt */
1380 custom.intreq = IF_RBF;
1381 mb();
1384 * Before we drop DTR, make sure the UART transmitter
1385 * has completely drained; this is especially
1386 * important if there is a transmit FIFO!
1388 rs_wait_until_sent(tty, state->timeout);
1390 shutdown(tty, state);
1391 rs_flush_buffer(tty);
1393 tty_ldisc_flush(tty);
1394 port->tty = NULL;
1396 tty_port_close_end(port, tty);
1400 * rs_wait_until_sent() --- wait until the transmitter is empty
1402 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1404 struct serial_state *info = tty->driver_data;
1405 unsigned long orig_jiffies, char_time;
1406 int lsr;
1408 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1409 return;
1411 if (info->xmit_fifo_size == 0)
1412 return; /* Just in case.... */
1414 orig_jiffies = jiffies;
1417 * Set the check interval to be 1/5 of the estimated time to
1418 * send a single character, and make it at least 1. The check
1419 * interval should also be less than the timeout.
1421 * Note: we have to use pretty tight timings here to satisfy
1422 * the NIST-PCTS.
1424 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1425 char_time = char_time / 5;
1426 if (char_time == 0)
1427 char_time = 1;
1428 if (timeout)
1429 char_time = min_t(unsigned long, char_time, timeout);
1431 * If the transmitter hasn't cleared in twice the approximate
1432 * amount of time to send the entire FIFO, it probably won't
1433 * ever clear. This assumes the UART isn't doing flow
1434 * control, which is currently the case. Hence, if it ever
1435 * takes longer than info->timeout, this is probably due to a
1436 * UART bug of some kind. So, we clamp the timeout parameter at
1437 * 2*info->timeout.
1439 if (!timeout || timeout > 2*info->timeout)
1440 timeout = 2*info->timeout;
1441 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1442 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1443 printk("jiff=%lu...", jiffies);
1444 #endif
1445 while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1446 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1447 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1448 #endif
1449 msleep_interruptible(jiffies_to_msecs(char_time));
1450 if (signal_pending(current))
1451 break;
1452 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1453 break;
1455 __set_current_state(TASK_RUNNING);
1457 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1458 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1459 #endif
1463 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1465 static void rs_hangup(struct tty_struct *tty)
1467 struct serial_state *info = tty->driver_data;
1469 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1470 return;
1472 rs_flush_buffer(tty);
1473 shutdown(tty, info);
1474 info->tport.count = 0;
1475 tty_port_set_active(&info->tport, 0);
1476 info->tport.tty = NULL;
1477 wake_up_interruptible(&info->tport.open_wait);
1481 * This routine is called whenever a serial port is opened. It
1482 * enables interrupts for a serial port, linking in its async structure into
1483 * the IRQ chain. It also performs the serial-specific
1484 * initialization for the tty structure.
1486 static int rs_open(struct tty_struct *tty, struct file * filp)
1488 struct serial_state *info = rs_table + tty->index;
1489 struct tty_port *port = &info->tport;
1490 int retval;
1492 port->count++;
1493 port->tty = tty;
1494 tty->driver_data = info;
1495 tty->port = port;
1496 if (serial_paranoia_check(info, tty->name, "rs_open"))
1497 return -ENODEV;
1499 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1501 retval = startup(tty, info);
1502 if (retval) {
1503 return retval;
1506 return tty_port_block_til_ready(port, tty, filp);
1510 * /proc fs routines....
1513 static inline void line_info(struct seq_file *m, int line,
1514 struct serial_state *state)
1516 char stat_buf[30], control, status;
1517 unsigned long flags;
1519 seq_printf(m, "%d: uart:amiga_builtin", line);
1521 local_irq_save(flags);
1522 status = ciab.pra;
1523 control = tty_port_initialized(&state->tport) ? state->MCR : status;
1524 local_irq_restore(flags);
1526 stat_buf[0] = 0;
1527 stat_buf[1] = 0;
1528 if(!(control & SER_RTS))
1529 strcat(stat_buf, "|RTS");
1530 if(!(status & SER_CTS))
1531 strcat(stat_buf, "|CTS");
1532 if(!(control & SER_DTR))
1533 strcat(stat_buf, "|DTR");
1534 if(!(status & SER_DSR))
1535 strcat(stat_buf, "|DSR");
1536 if(!(status & SER_DCD))
1537 strcat(stat_buf, "|CD");
1539 if (state->quot)
1540 seq_printf(m, " baud:%d", state->baud_base / state->quot);
1542 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1544 if (state->icount.frame)
1545 seq_printf(m, " fe:%d", state->icount.frame);
1547 if (state->icount.parity)
1548 seq_printf(m, " pe:%d", state->icount.parity);
1550 if (state->icount.brk)
1551 seq_printf(m, " brk:%d", state->icount.brk);
1553 if (state->icount.overrun)
1554 seq_printf(m, " oe:%d", state->icount.overrun);
1557 * Last thing is the RS-232 status lines
1559 seq_printf(m, " %s\n", stat_buf+1);
1562 static int rs_proc_show(struct seq_file *m, void *v)
1564 seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
1565 line_info(m, 0, &rs_table[0]);
1566 return 0;
1569 static int rs_proc_open(struct inode *inode, struct file *file)
1571 return single_open(file, rs_proc_show, NULL);
1574 static const struct file_operations rs_proc_fops = {
1575 .owner = THIS_MODULE,
1576 .open = rs_proc_open,
1577 .read = seq_read,
1578 .llseek = seq_lseek,
1579 .release = single_release,
1583 * ---------------------------------------------------------------------
1584 * rs_init() and friends
1586 * rs_init() is called at boot-time to initialize the serial driver.
1587 * ---------------------------------------------------------------------
1591 * This routine prints out the appropriate serial driver version
1592 * number, and identifies which options were configured into this
1593 * driver.
1595 static void show_serial_version(void)
1597 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1601 static const struct tty_operations serial_ops = {
1602 .open = rs_open,
1603 .close = rs_close,
1604 .write = rs_write,
1605 .put_char = rs_put_char,
1606 .flush_chars = rs_flush_chars,
1607 .write_room = rs_write_room,
1608 .chars_in_buffer = rs_chars_in_buffer,
1609 .flush_buffer = rs_flush_buffer,
1610 .ioctl = rs_ioctl,
1611 .throttle = rs_throttle,
1612 .unthrottle = rs_unthrottle,
1613 .set_termios = rs_set_termios,
1614 .stop = rs_stop,
1615 .start = rs_start,
1616 .hangup = rs_hangup,
1617 .break_ctl = rs_break,
1618 .send_xchar = rs_send_xchar,
1619 .wait_until_sent = rs_wait_until_sent,
1620 .tiocmget = rs_tiocmget,
1621 .tiocmset = rs_tiocmset,
1622 .get_icount = rs_get_icount,
1623 .proc_fops = &rs_proc_fops,
1626 static int amiga_carrier_raised(struct tty_port *port)
1628 return !(ciab.pra & SER_DCD);
1631 static void amiga_dtr_rts(struct tty_port *port, int raise)
1633 struct serial_state *info = container_of(port, struct serial_state,
1634 tport);
1635 unsigned long flags;
1637 if (raise)
1638 info->MCR |= SER_DTR|SER_RTS;
1639 else
1640 info->MCR &= ~(SER_DTR|SER_RTS);
1642 local_irq_save(flags);
1643 rtsdtr_ctrl(info->MCR);
1644 local_irq_restore(flags);
1647 static const struct tty_port_operations amiga_port_ops = {
1648 .carrier_raised = amiga_carrier_raised,
1649 .dtr_rts = amiga_dtr_rts,
1653 * The serial driver boot-time initialization code!
1655 static int __init amiga_serial_probe(struct platform_device *pdev)
1657 unsigned long flags;
1658 struct serial_state * state;
1659 int error;
1661 serial_driver = alloc_tty_driver(NR_PORTS);
1662 if (!serial_driver)
1663 return -ENOMEM;
1665 show_serial_version();
1667 /* Initialize the tty_driver structure */
1669 serial_driver->driver_name = "amiserial";
1670 serial_driver->name = "ttyS";
1671 serial_driver->major = TTY_MAJOR;
1672 serial_driver->minor_start = 64;
1673 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1674 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1675 serial_driver->init_termios = tty_std_termios;
1676 serial_driver->init_termios.c_cflag =
1677 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1678 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1679 tty_set_operations(serial_driver, &serial_ops);
1681 state = rs_table;
1682 state->port = (int)&custom.serdatr; /* Just to give it a value */
1683 state->custom_divisor = 0;
1684 state->icount.cts = state->icount.dsr =
1685 state->icount.rng = state->icount.dcd = 0;
1686 state->icount.rx = state->icount.tx = 0;
1687 state->icount.frame = state->icount.parity = 0;
1688 state->icount.overrun = state->icount.brk = 0;
1689 tty_port_init(&state->tport);
1690 state->tport.ops = &amiga_port_ops;
1691 tty_port_link_device(&state->tport, serial_driver, 0);
1693 error = tty_register_driver(serial_driver);
1694 if (error)
1695 goto fail_put_tty_driver;
1697 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
1699 /* Hardware set up */
1701 state->baud_base = amiga_colorclock;
1702 state->xmit_fifo_size = 1;
1704 /* set ISRs, and then disable the rx interrupts */
1705 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
1706 if (error)
1707 goto fail_unregister;
1709 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
1710 "serial RX", state);
1711 if (error)
1712 goto fail_free_irq;
1714 local_irq_save(flags);
1716 /* turn off Rx and Tx interrupts */
1717 custom.intena = IF_RBF | IF_TBE;
1718 mb();
1720 /* clear any pending interrupt */
1721 custom.intreq = IF_RBF | IF_TBE;
1722 mb();
1724 local_irq_restore(flags);
1727 * set the appropriate directions for the modem control flags,
1728 * and clear RTS and DTR
1730 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
1731 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
1733 platform_set_drvdata(pdev, state);
1735 return 0;
1737 fail_free_irq:
1738 free_irq(IRQ_AMIGA_TBE, state);
1739 fail_unregister:
1740 tty_unregister_driver(serial_driver);
1741 fail_put_tty_driver:
1742 tty_port_destroy(&state->tport);
1743 put_tty_driver(serial_driver);
1744 return error;
1747 static int __exit amiga_serial_remove(struct platform_device *pdev)
1749 int error;
1750 struct serial_state *state = platform_get_drvdata(pdev);
1752 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
1753 error = tty_unregister_driver(serial_driver);
1754 if (error)
1755 printk("SERIAL: failed to unregister serial driver (%d)\n",
1756 error);
1757 put_tty_driver(serial_driver);
1758 tty_port_destroy(&state->tport);
1760 free_irq(IRQ_AMIGA_TBE, state);
1761 free_irq(IRQ_AMIGA_RBF, state);
1763 return error;
1766 static struct platform_driver amiga_serial_driver = {
1767 .remove = __exit_p(amiga_serial_remove),
1768 .driver = {
1769 .name = "amiga-serial",
1773 module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe);
1776 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1779 * ------------------------------------------------------------
1780 * Serial console driver
1781 * ------------------------------------------------------------
1784 static void amiga_serial_putc(char c)
1786 custom.serdat = (unsigned char)c | 0x100;
1787 while (!(custom.serdatr & 0x2000))
1788 barrier();
1792 * Print a string to the serial port trying not to disturb
1793 * any possible real use of the port...
1795 * The console must be locked when we get here.
1797 static void serial_console_write(struct console *co, const char *s,
1798 unsigned count)
1800 unsigned short intena = custom.intenar;
1802 custom.intena = IF_TBE;
1804 while (count--) {
1805 if (*s == '\n')
1806 amiga_serial_putc('\r');
1807 amiga_serial_putc(*s++);
1810 custom.intena = IF_SETCLR | (intena & IF_TBE);
1813 static struct tty_driver *serial_console_device(struct console *c, int *index)
1815 *index = 0;
1816 return serial_driver;
1819 static struct console sercons = {
1820 .name = "ttyS",
1821 .write = serial_console_write,
1822 .device = serial_console_device,
1823 .flags = CON_PRINTBUFFER,
1824 .index = -1,
1828 * Register console.
1830 static int __init amiserial_console_init(void)
1832 if (!MACH_IS_AMIGA)
1833 return -ENODEV;
1835 register_console(&sercons);
1836 return 0;
1838 console_initcall(amiserial_console_init);
1840 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1842 MODULE_LICENSE("GPL");
1843 MODULE_ALIAS("platform:amiga-serial");