2 * Serial driver for the amiga builtin port.
4 * This code was created by taking serial.c version 4.30 from kernel
5 * release 2.3.22, replacing all hardware related stuff with the
6 * corresponding amiga hardware actions, and removing all irrelevant
7 * code. As a consequence, it uses many of the constants and names
8 * associated with the registers and bits of 16550 compatible UARTS -
9 * but only to keep track of status, etc in the state variables. It
10 * was done this was to make it easier to keep the code in line with
11 * (non hardware specific) changes to serial.c.
13 * The port is registered with the tty driver as minor device 64, and
14 * therefore other ports should should only use 65 upwards.
16 * Richard Lucock 28/12/99
18 * Copyright (C) 1991, 1992 Linus Torvalds
19 * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
20 * 1998, 1999 Theodore Ts'o
25 * Serial driver configuration section. Here are the various options:
27 * SERIAL_PARANOIA_CHECK
28 * Check the magic number for the async_structure where
32 #include <linux/delay.h>
34 #undef SERIAL_PARANOIA_CHECK
35 #define SERIAL_DO_RESTART
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
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->state->flags), serial_driver->refcount,info->count,tty->count,s)
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/serialP.h>
62 #include <linux/serial_reg.h>
63 static char *serial_version = "4.30";
65 #include <linux/errno.h>
66 #include <linux/signal.h>
67 #include <linux/sched.h>
68 #include <linux/kernel.h>
69 #include <linux/timer.h>
70 #include <linux/interrupt.h>
71 #include <linux/tty.h>
72 #include <linux/tty_flip.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>
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>
88 #include <asm/system.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";
130 printk(badinfo, name, routine);
133 if (info->magic != SERIAL_MAGIC) {
134 printk(badmagic, name, routine);
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 = tty->driver_data;
176 if (serial_paranoia_check(info, tty->name, "rs_stop"))
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;
185 custom.intreq = IF_TBE;
188 local_irq_restore(flags);
191 static void rs_start(struct tty_struct *tty)
193 struct async_struct *info = tty->driver_data;
196 if (serial_paranoia_check(info, tty->name, "rs_start"))
199 local_irq_save(flags);
200 if (info->xmit.head != info->xmit.tail
202 && !(info->IER & UART_IER_THRI)) {
203 info->IER |= UART_IER_THRI;
204 custom.intena = IF_SETCLR | IF_TBE;
206 /* set a pending Tx Interrupt, transmitter should restart now */
207 custom.intreq = IF_SETCLR | IF_TBE;
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
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 * -----------------------------------------------------------------------
234 static void receive_chars(struct async_struct *info)
238 struct tty_struct *tty = info->tty;
239 unsigned char ch, flag;
240 struct async_icount *icount;
243 icount = &info->state->icount;
245 status = UART_LSR_DR; /* We obviously have a character! */
246 serdatr = custom.serdatr;
248 custom.intreq = IF_RBF;
251 if((serdatr & 0x1ff) == 0)
252 status |= UART_LSR_BI;
253 if(serdatr & SDR_OVRUN)
254 status |= UART_LSR_OE;
259 #ifdef SERIAL_DEBUG_INTR
260 printk("DR%02x:%02x...", ch, status);
265 * We don't handle parity or frame errors - but I have left
266 * the code in, since I'm not sure that the errors can't be
270 if (status & (UART_LSR_BI | UART_LSR_PE |
271 UART_LSR_FE | UART_LSR_OE)) {
273 * For statistics only
275 if (status & UART_LSR_BI) {
276 status &= ~(UART_LSR_FE | UART_LSR_PE);
278 } else if (status & UART_LSR_PE)
280 else if (status & UART_LSR_FE)
282 if (status & UART_LSR_OE)
286 * Now check to see if character should be
287 * ignored, and mask off conditions which
290 if (status & info->ignore_status_mask)
293 status &= info->read_status_mask;
295 if (status & (UART_LSR_BI)) {
296 #ifdef SERIAL_DEBUG_INTR
297 printk("handling break....");
300 if (info->state->flags & ASYNC_SAK)
302 } else if (status & UART_LSR_PE)
304 else if (status & UART_LSR_FE)
306 if (status & UART_LSR_OE) {
308 * Overrun is special, since it's
309 * reported immediately, and doesn't
310 * affect the current character
315 tty_insert_flip_char(tty, ch, flag);
317 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
318 tty_flip_buffer_push(tty);
323 static void transmit_chars(struct async_struct *info)
325 custom.intreq = IF_TBE;
328 custom.serdat = info->x_char | 0x100;
330 info->state->icount.tx++;
334 if (info->xmit.head == info->xmit.tail
335 || info->tty->stopped
336 || info->tty->hw_stopped) {
337 info->IER &= ~UART_IER_THRI;
338 custom.intena = IF_TBE;
343 custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
345 info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
346 info->state->icount.tx++;
348 if (CIRC_CNT(info->xmit.head,
350 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
351 tty_wakeup(info->tty);
353 #ifdef SERIAL_DEBUG_INTR
356 if (info->xmit.head == info->xmit.tail) {
357 custom.intena = IF_TBE;
359 info->IER &= ~UART_IER_THRI;
363 static void check_modem_status(struct async_struct *info)
365 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
366 unsigned char dstatus;
367 struct async_icount *icount;
369 /* Determine bits that have changed */
370 dstatus = status ^ current_ctl_bits;
371 current_ctl_bits = status;
374 icount = &info->state->icount;
375 /* update input line counters */
376 if (dstatus & SER_DSR)
378 if (dstatus & SER_DCD) {
380 #ifdef CONFIG_HARD_PPS
381 if ((info->state->flags & ASYNC_HARDPPS_CD) &&
386 if (dstatus & SER_CTS)
388 wake_up_interruptible(&info->delta_msr_wait);
391 if ((info->state->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) {
392 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
393 printk("ttyS%d CD now %s...", info->line,
394 (!(status & SER_DCD)) ? "on" : "off");
396 if (!(status & SER_DCD))
397 wake_up_interruptible(&info->open_wait);
399 #ifdef SERIAL_DEBUG_OPEN
400 printk("doing serial hangup...");
403 tty_hangup(info->tty);
406 if (info->state->flags & ASYNC_CTS_FLOW) {
407 if (info->tty->hw_stopped) {
408 if (!(status & SER_CTS)) {
409 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
410 printk("CTS tx start...");
412 info->tty->hw_stopped = 0;
413 info->IER |= UART_IER_THRI;
414 custom.intena = IF_SETCLR | IF_TBE;
416 /* set a pending Tx Interrupt, transmitter should restart now */
417 custom.intreq = IF_SETCLR | IF_TBE;
419 tty_wakeup(info->tty);
423 if ((status & SER_CTS)) {
424 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
425 printk("CTS tx stop...");
427 info->tty->hw_stopped = 1;
428 info->IER &= ~UART_IER_THRI;
429 /* disable Tx interrupt and remove any pending interrupts */
430 custom.intena = IF_TBE;
432 custom.intreq = IF_TBE;
439 static irqreturn_t ser_vbl_int( int irq, void *data)
441 /* vbl is just a periodic interrupt we tie into to update modem status */
442 struct async_struct * info = IRQ_ports;
444 * TBD - is it better to unregister from this interrupt or to
445 * ignore it if MSI is clear ?
447 if(info->IER & UART_IER_MSI)
448 check_modem_status(info);
452 static irqreturn_t ser_rx_int(int irq, void *dev_id)
454 struct async_struct * info;
456 #ifdef SERIAL_DEBUG_INTR
457 printk("ser_rx_int...");
461 if (!info || !info->tty)
465 #ifdef SERIAL_DEBUG_INTR
471 static irqreturn_t ser_tx_int(int irq, void *dev_id)
473 struct async_struct * info;
475 if (custom.serdatr & SDR_TBE) {
476 #ifdef SERIAL_DEBUG_INTR
477 printk("ser_tx_int...");
481 if (!info || !info->tty)
484 transmit_chars(info);
485 #ifdef SERIAL_DEBUG_INTR
493 * -------------------------------------------------------------------
494 * Here ends the serial interrupt routines.
495 * -------------------------------------------------------------------
499 * ---------------------------------------------------------------
500 * Low level utility subroutines for the serial driver: routines to
501 * figure out the appropriate timeout for an interrupt chain, routines
502 * to initialize and startup a serial port, and routines to shutdown a
503 * serial port. Useful stuff like that.
504 * ---------------------------------------------------------------
507 static int startup(struct async_struct * info)
513 page = get_zeroed_page(GFP_KERNEL);
517 local_irq_save(flags);
519 if (info->state->flags & ASYNC_INITIALIZED) {
527 info->xmit.buf = (unsigned char *) page;
529 #ifdef SERIAL_DEBUG_OPEN
530 printk("starting up ttys%d ...", info->line);
533 /* Clear anything in the input buffer */
535 custom.intreq = IF_RBF;
538 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
540 if (serial_isroot()) {
542 set_bit(TTY_IO_ERROR,
549 /* enable both Rx and Tx interrupts */
550 custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
552 info->IER = UART_IER_MSI;
554 /* remember current state of the DCD and CTS bits */
555 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
560 if (info->tty->termios->c_cflag & CBAUD)
561 info->MCR = SER_DTR | SER_RTS;
562 rtsdtr_ctrl(info->MCR);
565 clear_bit(TTY_IO_ERROR, &info->tty->flags);
566 info->xmit.head = info->xmit.tail = 0;
569 * Set up the tty->alt_speed kludge
572 if ((info->state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
573 info->tty->alt_speed = 57600;
574 if ((info->state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
575 info->tty->alt_speed = 115200;
576 if ((info->state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
577 info->tty->alt_speed = 230400;
578 if ((info->state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
579 info->tty->alt_speed = 460800;
583 * and set the speed of the serial port
585 change_speed(info, NULL);
587 info->state->flags |= ASYNC_INITIALIZED;
588 local_irq_restore(flags);
592 local_irq_restore(flags);
597 * This routine will shutdown a serial port; interrupts are disabled, and
598 * DTR is dropped if the hangup on close termio flag is on.
600 static void shutdown(struct async_struct * info)
603 struct serial_state *state;
605 if (!(info->state->flags & ASYNC_INITIALIZED))
610 #ifdef SERIAL_DEBUG_OPEN
611 printk("Shutting down serial port %d ....\n", info->line);
614 local_irq_save(flags); /* Disable interrupts */
617 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
618 * here so the queue might never be waken up
620 wake_up_interruptible(&info->delta_msr_wait);
625 * Free the IRQ, if necessary
627 free_irq(IRQ_AMIGA_VERTB, info);
629 if (info->xmit.buf) {
630 free_page((unsigned long) info->xmit.buf);
631 info->xmit.buf = NULL;
635 custom.intena = IF_RBF | IF_TBE;
638 /* disable break condition */
639 custom.adkcon = AC_UARTBRK;
642 if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
643 info->MCR &= ~(SER_DTR|SER_RTS);
644 rtsdtr_ctrl(info->MCR);
647 set_bit(TTY_IO_ERROR, &info->tty->flags);
649 info->state->flags &= ~ASYNC_INITIALIZED;
650 local_irq_restore(flags);
655 * This routine is called to set the UART divisor registers to match
656 * the specified baud rate for a serial port.
658 static void change_speed(struct async_struct *info,
659 struct ktermios *old_termios)
661 int quot = 0, baud_base, baud;
662 unsigned cflag, cval = 0;
666 if (!info->tty || !info->tty->termios)
668 cflag = info->tty->termios->c_cflag;
670 /* Byte size is always 8 bits plus parity bit if requested */
673 if (cflag & CSTOPB) {
677 if (cflag & PARENB) {
678 cval |= UART_LCR_PARITY;
681 if (!(cflag & PARODD))
682 cval |= UART_LCR_EPAR;
685 cval |= UART_LCR_SPAR;
688 /* Determine divisor based on baud rate */
689 baud = tty_get_baud_rate(info->tty);
691 baud = 9600; /* B0 transition handled in rs_set_termios */
692 baud_base = info->state->baud_base;
694 ((info->state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
695 quot = info->state->custom_divisor;
698 /* Special case since 134 is really 134.5 */
699 quot = (2*baud_base / 269);
701 quot = baud_base / baud;
703 /* If the quotient is zero refuse the change */
704 if (!quot && old_termios) {
705 /* FIXME: Will need updating for new tty in the end */
706 info->tty->termios->c_cflag &= ~CBAUD;
707 info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
708 baud = tty_get_baud_rate(info->tty);
712 ((info->state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
713 quot = info->state->custom_divisor;
716 /* Special case since 134 is really 134.5 */
717 quot = (2*baud_base / 269);
719 quot = baud_base / baud;
722 /* As a last resort, if the quotient is zero, default to 9600 bps */
724 quot = baud_base / 9600;
726 info->timeout = ((info->state->xmit_fifo_size*HZ*bits*quot) / baud_base);
727 info->timeout += HZ/50; /* Add .02 seconds of slop */
729 /* CTS flow control flag and modem status interrupts */
730 info->IER &= ~UART_IER_MSI;
731 if (info->state->flags & ASYNC_HARDPPS_CD)
732 info->IER |= UART_IER_MSI;
733 if (cflag & CRTSCTS) {
734 info->state->flags |= ASYNC_CTS_FLOW;
735 info->IER |= UART_IER_MSI;
737 info->state->flags &= ~ASYNC_CTS_FLOW;
739 info->state->flags &= ~ASYNC_CHECK_CD;
741 info->state->flags |= ASYNC_CHECK_CD;
742 info->IER |= UART_IER_MSI;
745 * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
749 * Set up parity check flag
752 info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
753 if (I_INPCK(info->tty))
754 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
755 if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
756 info->read_status_mask |= UART_LSR_BI;
759 * Characters to ignore
761 info->ignore_status_mask = 0;
762 if (I_IGNPAR(info->tty))
763 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
764 if (I_IGNBRK(info->tty)) {
765 info->ignore_status_mask |= UART_LSR_BI;
767 * If we're ignore parity and break indicators, ignore
768 * overruns too. (For real raw support).
770 if (I_IGNPAR(info->tty))
771 info->ignore_status_mask |= UART_LSR_OE;
774 * !!! ignore all characters if CREAD is not set
776 if ((cflag & CREAD) == 0)
777 info->ignore_status_mask |= UART_LSR_DR;
778 local_irq_save(flags);
783 /* Set up the baud rate */
786 /* Enable or disable parity bit */
788 if(cval & UART_LCR_PARITY)
789 serper |= (SERPER_PARENB);
791 custom.serper = serper;
795 local_irq_restore(flags);
798 static int rs_put_char(struct tty_struct *tty, unsigned char ch)
800 struct async_struct *info;
803 info = tty->driver_data;
805 if (serial_paranoia_check(info, tty->name, "rs_put_char"))
811 local_irq_save(flags);
812 if (CIRC_SPACE(info->xmit.head,
814 SERIAL_XMIT_SIZE) == 0) {
815 local_irq_restore(flags);
819 info->xmit.buf[info->xmit.head++] = ch;
820 info->xmit.head &= SERIAL_XMIT_SIZE-1;
821 local_irq_restore(flags);
825 static void rs_flush_chars(struct tty_struct *tty)
827 struct async_struct *info = tty->driver_data;
830 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
833 if (info->xmit.head == info->xmit.tail
839 local_irq_save(flags);
840 info->IER |= UART_IER_THRI;
841 custom.intena = IF_SETCLR | IF_TBE;
843 /* set a pending Tx Interrupt, transmitter should restart now */
844 custom.intreq = IF_SETCLR | IF_TBE;
846 local_irq_restore(flags);
849 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
852 struct async_struct *info;
855 info = tty->driver_data;
857 if (serial_paranoia_check(info, tty->name, "rs_write"))
863 local_irq_save(flags);
865 c = CIRC_SPACE_TO_END(info->xmit.head,
873 memcpy(info->xmit.buf + info->xmit.head, buf, c);
874 info->xmit.head = ((info->xmit.head + c) &
875 (SERIAL_XMIT_SIZE-1));
880 local_irq_restore(flags);
882 if (info->xmit.head != info->xmit.tail
885 && !(info->IER & UART_IER_THRI)) {
886 info->IER |= UART_IER_THRI;
888 custom.intena = IF_SETCLR | IF_TBE;
890 /* set a pending Tx Interrupt, transmitter should restart now */
891 custom.intreq = IF_SETCLR | IF_TBE;
893 local_irq_restore(flags);
898 static int rs_write_room(struct tty_struct *tty)
900 struct async_struct *info = tty->driver_data;
902 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
904 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
907 static int rs_chars_in_buffer(struct tty_struct *tty)
909 struct async_struct *info = tty->driver_data;
911 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
913 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
916 static void rs_flush_buffer(struct tty_struct *tty)
918 struct async_struct *info = tty->driver_data;
921 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
923 local_irq_save(flags);
924 info->xmit.head = info->xmit.tail = 0;
925 local_irq_restore(flags);
930 * This function is used to send a high-priority XON/XOFF character to
933 static void rs_send_xchar(struct tty_struct *tty, char ch)
935 struct async_struct *info = tty->driver_data;
938 if (serial_paranoia_check(info, tty->name, "rs_send_char"))
943 /* Make sure transmit interrupts are on */
946 local_irq_save(flags);
947 if(!(custom.intenar & IF_TBE)) {
948 custom.intena = IF_SETCLR | IF_TBE;
950 /* set a pending Tx Interrupt, transmitter should restart now */
951 custom.intreq = IF_SETCLR | IF_TBE;
954 local_irq_restore(flags);
956 info->IER |= UART_IER_THRI;
961 * ------------------------------------------------------------
964 * This routine is called by the upper-layer tty layer to signal that
965 * incoming characters should be throttled.
966 * ------------------------------------------------------------
968 static void rs_throttle(struct tty_struct * tty)
970 struct async_struct *info = tty->driver_data;
972 #ifdef SERIAL_DEBUG_THROTTLE
975 printk("throttle %s: %d....\n", tty_name(tty, buf),
976 tty->ldisc.chars_in_buffer(tty));
979 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
983 rs_send_xchar(tty, STOP_CHAR(tty));
985 if (tty->termios->c_cflag & CRTSCTS)
986 info->MCR &= ~SER_RTS;
988 local_irq_save(flags);
989 rtsdtr_ctrl(info->MCR);
990 local_irq_restore(flags);
993 static void rs_unthrottle(struct tty_struct * tty)
995 struct async_struct *info = tty->driver_data;
997 #ifdef SERIAL_DEBUG_THROTTLE
1000 printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1001 tty->ldisc.chars_in_buffer(tty));
1004 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1011 rs_send_xchar(tty, START_CHAR(tty));
1013 if (tty->termios->c_cflag & CRTSCTS)
1014 info->MCR |= SER_RTS;
1015 local_irq_save(flags);
1016 rtsdtr_ctrl(info->MCR);
1017 local_irq_restore(flags);
1021 * ------------------------------------------------------------
1022 * rs_ioctl() and friends
1023 * ------------------------------------------------------------
1026 static int get_serial_info(struct async_struct * info,
1027 struct serial_struct __user * retinfo)
1029 struct serial_struct tmp;
1030 struct serial_state *state = info->state;
1034 memset(&tmp, 0, sizeof(tmp));
1036 tmp.type = state->type;
1037 tmp.line = state->line;
1038 tmp.port = state->port;
1039 tmp.irq = state->irq;
1040 tmp.flags = state->flags;
1041 tmp.xmit_fifo_size = state->xmit_fifo_size;
1042 tmp.baud_base = state->baud_base;
1043 tmp.close_delay = state->close_delay;
1044 tmp.closing_wait = state->closing_wait;
1045 tmp.custom_divisor = state->custom_divisor;
1047 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1052 static int set_serial_info(struct async_struct * info,
1053 struct serial_struct __user * new_info)
1055 struct serial_struct new_serial;
1056 struct serial_state old_state, *state;
1057 unsigned int change_irq,change_port;
1060 if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1064 state = info->state;
1067 change_irq = new_serial.irq != state->irq;
1068 change_port = (new_serial.port != state->port);
1069 if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size)) {
1074 if (!serial_isroot()) {
1075 if ((new_serial.baud_base != state->baud_base) ||
1076 (new_serial.close_delay != state->close_delay) ||
1077 (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1078 ((new_serial.flags & ~ASYNC_USR_MASK) !=
1079 (state->flags & ~ASYNC_USR_MASK)))
1081 state->flags = ((state->flags & ~ASYNC_USR_MASK) |
1082 (new_serial.flags & ASYNC_USR_MASK));
1083 state->custom_divisor = new_serial.custom_divisor;
1084 goto check_and_exit;
1087 if (new_serial.baud_base < 9600) {
1093 * OK, past this point, all the error checking has been done.
1094 * At this point, we start making changes.....
1097 state->baud_base = new_serial.baud_base;
1098 state->flags = ((state->flags & ~ASYNC_FLAGS) |
1099 (new_serial.flags & ASYNC_FLAGS));
1100 state->custom_divisor = new_serial.custom_divisor;
1101 state->close_delay = new_serial.close_delay * HZ/100;
1102 state->closing_wait = new_serial.closing_wait * HZ/100;
1103 info->tty->low_latency = (state->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1106 if (state->flags & ASYNC_INITIALIZED) {
1107 if (((old_state.flags & ASYNC_SPD_MASK) !=
1108 (state->flags & ASYNC_SPD_MASK)) ||
1109 (old_state.custom_divisor != state->custom_divisor)) {
1110 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1111 info->tty->alt_speed = 57600;
1112 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1113 info->tty->alt_speed = 115200;
1114 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1115 info->tty->alt_speed = 230400;
1116 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1117 info->tty->alt_speed = 460800;
1118 change_speed(info, NULL);
1121 retval = startup(info);
1128 * get_lsr_info - get line status register info
1130 * Purpose: Let user call ioctl() to get info when the UART physically
1131 * is emptied. On bus types like RS485, the transmitter must
1132 * release the bus after transmitting. This must be done when
1133 * the transmit shift register is empty, not be done when the
1134 * transmit holding register is empty. This functionality
1135 * allows an RS485 driver to be written in user space.
1137 static int get_lsr_info(struct async_struct * info, unsigned int __user *value)
1139 unsigned char status;
1140 unsigned int result;
1141 unsigned long flags;
1143 local_irq_save(flags);
1144 status = custom.serdatr;
1146 local_irq_restore(flags);
1147 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1148 if (copy_to_user(value, &result, sizeof(int)))
1154 static int rs_tiocmget(struct tty_struct *tty)
1156 struct async_struct * info = tty->driver_data;
1157 unsigned char control, status;
1158 unsigned long flags;
1160 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1162 if (tty->flags & (1 << TTY_IO_ERROR))
1165 control = info->MCR;
1166 local_irq_save(flags);
1168 local_irq_restore(flags);
1169 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1170 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1171 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1172 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1173 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1176 static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
1179 struct async_struct * info = tty->driver_data;
1180 unsigned long flags;
1182 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1184 if (tty->flags & (1 << TTY_IO_ERROR))
1187 local_irq_save(flags);
1188 if (set & TIOCM_RTS)
1189 info->MCR |= SER_RTS;
1190 if (set & TIOCM_DTR)
1191 info->MCR |= SER_DTR;
1192 if (clear & TIOCM_RTS)
1193 info->MCR &= ~SER_RTS;
1194 if (clear & TIOCM_DTR)
1195 info->MCR &= ~SER_DTR;
1196 rtsdtr_ctrl(info->MCR);
1197 local_irq_restore(flags);
1202 * rs_break() --- routine which turns the break handling on or off
1204 static int rs_break(struct tty_struct *tty, int break_state)
1206 struct async_struct * info = tty->driver_data;
1207 unsigned long flags;
1209 if (serial_paranoia_check(info, tty->name, "rs_break"))
1212 local_irq_save(flags);
1213 if (break_state == -1)
1214 custom.adkcon = AC_SETCLR | AC_UARTBRK;
1216 custom.adkcon = AC_UARTBRK;
1218 local_irq_restore(flags);
1223 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1224 * Return: write counters to the user passed counter struct
1225 * NB: both 1->0 and 0->1 transitions are counted except for
1226 * RI where only 0->1 is counted.
1228 static int rs_get_icount(struct tty_struct *tty,
1229 struct serial_icounter_struct *icount)
1231 struct async_struct *info = tty->driver_data;
1232 struct async_icount cnow;
1233 unsigned long flags;
1235 local_irq_save(flags);
1236 cnow = info->state->icount;
1237 local_irq_restore(flags);
1238 icount->cts = cnow.cts;
1239 icount->dsr = cnow.dsr;
1240 icount->rng = cnow.rng;
1241 icount->dcd = cnow.dcd;
1242 icount->rx = cnow.rx;
1243 icount->tx = cnow.tx;
1244 icount->frame = cnow.frame;
1245 icount->overrun = cnow.overrun;
1246 icount->parity = cnow.parity;
1247 icount->brk = cnow.brk;
1248 icount->buf_overrun = cnow.buf_overrun;
1253 static int rs_ioctl(struct tty_struct *tty,
1254 unsigned int cmd, unsigned long arg)
1256 struct async_struct * info = tty->driver_data;
1257 struct async_icount cprev, cnow; /* kernel counter temps */
1258 void __user *argp = (void __user *)arg;
1259 unsigned long flags;
1261 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1264 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1265 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1266 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1267 if (tty->flags & (1 << TTY_IO_ERROR))
1273 return get_serial_info(info, argp);
1275 return set_serial_info(info, argp);
1279 case TIOCSERGETLSR: /* Get line status register */
1280 return get_lsr_info(info, argp);
1282 case TIOCSERGSTRUCT:
1283 if (copy_to_user(argp,
1284 info, sizeof(struct async_struct)))
1289 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1290 * - mask passed in arg for lines of interest
1291 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1292 * Caller should use TIOCGICOUNT to see which one it was
1295 local_irq_save(flags);
1296 /* note the counters on entry */
1297 cprev = info->state->icount;
1298 local_irq_restore(flags);
1300 interruptible_sleep_on(&info->delta_msr_wait);
1301 /* see if a signal did it */
1302 if (signal_pending(current))
1303 return -ERESTARTSYS;
1304 local_irq_save(flags);
1305 cnow = info->state->icount; /* atomic copy */
1306 local_irq_restore(flags);
1307 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1308 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1309 return -EIO; /* no change => error */
1310 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1311 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1312 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1313 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1322 /* "setserial -W" is called in Debian boot */
1323 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1327 return -ENOIOCTLCMD;
1332 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1334 struct async_struct *info = tty->driver_data;
1335 unsigned long flags;
1336 unsigned int cflag = tty->termios->c_cflag;
1338 change_speed(info, old_termios);
1340 /* Handle transition to B0 status */
1341 if ((old_termios->c_cflag & CBAUD) &&
1343 info->MCR &= ~(SER_DTR|SER_RTS);
1344 local_irq_save(flags);
1345 rtsdtr_ctrl(info->MCR);
1346 local_irq_restore(flags);
1349 /* Handle transition away from B0 status */
1350 if (!(old_termios->c_cflag & CBAUD) &&
1352 info->MCR |= SER_DTR;
1353 if (!(tty->termios->c_cflag & CRTSCTS) ||
1354 !test_bit(TTY_THROTTLED, &tty->flags)) {
1355 info->MCR |= SER_RTS;
1357 local_irq_save(flags);
1358 rtsdtr_ctrl(info->MCR);
1359 local_irq_restore(flags);
1362 /* Handle turning off CRTSCTS */
1363 if ((old_termios->c_cflag & CRTSCTS) &&
1364 !(tty->termios->c_cflag & CRTSCTS)) {
1365 tty->hw_stopped = 0;
1371 * No need to wake up processes in open wait, since they
1372 * sample the CLOCAL flag once, and don't recheck it.
1373 * XXX It's not clear whether the current behavior is correct
1374 * or not. Hence, this may change.....
1376 if (!(old_termios->c_cflag & CLOCAL) &&
1377 (tty->termios->c_cflag & CLOCAL))
1378 wake_up_interruptible(&info->open_wait);
1383 * ------------------------------------------------------------
1386 * This routine is called when the serial port gets closed. First, we
1387 * wait for the last remaining data to be sent. Then, we unlink its
1388 * async structure from the interrupt chain if necessary, and we free
1389 * that IRQ if nothing is left in the chain.
1390 * ------------------------------------------------------------
1392 static void rs_close(struct tty_struct *tty, struct file * filp)
1394 struct async_struct * info = tty->driver_data;
1395 struct serial_state *state;
1396 unsigned long flags;
1398 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1401 state = info->state;
1403 local_irq_save(flags);
1405 if (tty_hung_up_p(filp)) {
1406 DBG_CNT("before DEC-hung");
1407 local_irq_restore(flags);
1411 #ifdef SERIAL_DEBUG_OPEN
1412 printk("rs_close ttys%d, count = %d\n", info->line, state->count);
1414 if ((tty->count == 1) && (state->count != 1)) {
1416 * Uh, oh. tty->count is 1, which means that the tty
1417 * structure will be freed. state->count should always
1418 * be one in these conditions. If it's greater than
1419 * one, we've got real problems, since it means the
1420 * serial port won't be shutdown.
1422 printk("rs_close: bad serial port count; tty->count is 1, "
1423 "state->count is %d\n", state->count);
1426 if (--state->count < 0) {
1427 printk("rs_close: bad serial port count for ttys%d: %d\n",
1428 state->line, state->count);
1432 DBG_CNT("before DEC-2");
1433 local_irq_restore(flags);
1436 state->flags |= ASYNC_CLOSING;
1438 * Now we wait for the transmit buffer to clear; and we notify
1439 * the line discipline to only process XON/XOFF characters.
1442 if (state->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1443 tty_wait_until_sent(tty, state->closing_wait);
1445 * At this point we stop accepting input. To do this, we
1446 * disable the receive line status interrupts, and tell the
1447 * interrupt driver to stop checking the data ready bit in the
1448 * line status register.
1450 info->read_status_mask &= ~UART_LSR_DR;
1451 if (state->flags & ASYNC_INITIALIZED) {
1452 /* disable receive interrupts */
1453 custom.intena = IF_RBF;
1455 /* clear any pending receive interrupt */
1456 custom.intreq = IF_RBF;
1460 * Before we drop DTR, make sure the UART transmitter
1461 * has completely drained; this is especially
1462 * important if there is a transmit FIFO!
1464 rs_wait_until_sent(tty, info->timeout);
1467 rs_flush_buffer(tty);
1469 tty_ldisc_flush(tty);
1472 if (info->blocked_open) {
1473 if (state->close_delay) {
1474 msleep_interruptible(jiffies_to_msecs(state->close_delay));
1476 wake_up_interruptible(&info->open_wait);
1478 state->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1479 wake_up_interruptible(&info->close_wait);
1480 local_irq_restore(flags);
1484 * rs_wait_until_sent() --- wait until the transmitter is empty
1486 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1488 struct async_struct * info = tty->driver_data;
1489 unsigned long orig_jiffies, char_time;
1492 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1495 if (info->state->xmit_fifo_size == 0)
1496 return; /* Just in case.... */
1498 orig_jiffies = jiffies;
1501 * Set the check interval to be 1/5 of the estimated time to
1502 * send a single character, and make it at least 1. The check
1503 * interval should also be less than the timeout.
1505 * Note: we have to use pretty tight timings here to satisfy
1508 char_time = (info->timeout - HZ/50) / info->state->xmit_fifo_size;
1509 char_time = char_time / 5;
1513 char_time = min_t(unsigned long, char_time, timeout);
1515 * If the transmitter hasn't cleared in twice the approximate
1516 * amount of time to send the entire FIFO, it probably won't
1517 * ever clear. This assumes the UART isn't doing flow
1518 * control, which is currently the case. Hence, if it ever
1519 * takes longer than info->timeout, this is probably due to a
1520 * UART bug of some kind. So, we clamp the timeout parameter at
1523 if (!timeout || timeout > 2*info->timeout)
1524 timeout = 2*info->timeout;
1525 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1526 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1527 printk("jiff=%lu...", jiffies);
1529 while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1530 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1531 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1533 msleep_interruptible(jiffies_to_msecs(char_time));
1534 if (signal_pending(current))
1536 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1539 __set_current_state(TASK_RUNNING);
1541 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1542 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1547 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1549 static void rs_hangup(struct tty_struct *tty)
1551 struct async_struct * info = tty->driver_data;
1552 struct serial_state *state = info->state;
1554 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1557 state = info->state;
1559 rs_flush_buffer(tty);
1562 state->flags &= ~ASYNC_NORMAL_ACTIVE;
1564 wake_up_interruptible(&info->open_wait);
1568 * ------------------------------------------------------------
1569 * rs_open() and friends
1570 * ------------------------------------------------------------
1572 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1573 struct async_struct *info)
1575 #ifdef DECLARE_WAITQUEUE
1576 DECLARE_WAITQUEUE(wait, current);
1578 struct wait_queue wait = { current, NULL };
1580 struct serial_state *state = info->state;
1582 int do_clocal = 0, extra_count = 0;
1583 unsigned long flags;
1586 * If the device is in the middle of being closed, then block
1587 * until it's done, and then try again.
1589 if (tty_hung_up_p(filp) ||
1590 (state->flags & ASYNC_CLOSING)) {
1591 if (state->flags & ASYNC_CLOSING)
1592 interruptible_sleep_on(&info->close_wait);
1593 #ifdef SERIAL_DO_RESTART
1594 return ((state->flags & ASYNC_HUP_NOTIFY) ?
1595 -EAGAIN : -ERESTARTSYS);
1602 * If non-blocking mode is set, or the port is not enabled,
1603 * then make the check up front and then exit.
1605 if ((filp->f_flags & O_NONBLOCK) ||
1606 (tty->flags & (1 << TTY_IO_ERROR))) {
1607 state->flags |= ASYNC_NORMAL_ACTIVE;
1611 if (tty->termios->c_cflag & CLOCAL)
1615 * Block waiting for the carrier detect and the line to become
1616 * free (i.e., not in use by the callout). While we are in
1617 * this loop, state->count is dropped by one, so that
1618 * rs_close() knows when to free things. We restore it upon
1619 * exit, either normal or abnormal.
1622 add_wait_queue(&info->open_wait, &wait);
1623 #ifdef SERIAL_DEBUG_OPEN
1624 printk("block_til_ready before block: ttys%d, count = %d\n",
1625 state->line, state->count);
1627 local_irq_save(flags);
1628 if (!tty_hung_up_p(filp)) {
1632 local_irq_restore(flags);
1633 info->blocked_open++;
1635 local_irq_save(flags);
1636 if (tty->termios->c_cflag & CBAUD)
1637 rtsdtr_ctrl(SER_DTR|SER_RTS);
1638 local_irq_restore(flags);
1639 set_current_state(TASK_INTERRUPTIBLE);
1640 if (tty_hung_up_p(filp) ||
1641 !(state->flags & ASYNC_INITIALIZED)) {
1642 #ifdef SERIAL_DO_RESTART
1643 if (state->flags & ASYNC_HUP_NOTIFY)
1646 retval = -ERESTARTSYS;
1652 if (!(state->flags & ASYNC_CLOSING) &&
1653 (do_clocal || (!(ciab.pra & SER_DCD)) ))
1655 if (signal_pending(current)) {
1656 retval = -ERESTARTSYS;
1659 #ifdef SERIAL_DEBUG_OPEN
1660 printk("block_til_ready blocking: ttys%d, count = %d\n",
1661 info->line, state->count);
1667 __set_current_state(TASK_RUNNING);
1668 remove_wait_queue(&info->open_wait, &wait);
1671 info->blocked_open--;
1672 #ifdef SERIAL_DEBUG_OPEN
1673 printk("block_til_ready after blocking: ttys%d, count = %d\n",
1674 info->line, state->count);
1678 state->flags |= ASYNC_NORMAL_ACTIVE;
1682 static int get_async_struct(int line, struct async_struct **ret_info)
1684 struct async_struct *info;
1685 struct serial_state *sstate;
1687 sstate = rs_table + line;
1690 *ret_info = sstate->info;
1693 info = kzalloc(sizeof(struct async_struct), GFP_KERNEL);
1698 #ifdef DECLARE_WAITQUEUE
1699 init_waitqueue_head(&info->open_wait);
1700 init_waitqueue_head(&info->close_wait);
1701 init_waitqueue_head(&info->delta_msr_wait);
1703 info->state = sstate;
1706 *ret_info = sstate->info;
1709 *ret_info = sstate->info = info;
1714 * This routine is called whenever a serial port is opened. It
1715 * enables interrupts for a serial port, linking in its async structure into
1716 * the IRQ chain. It also performs the serial-specific
1717 * initialization for the tty structure.
1719 static int rs_open(struct tty_struct *tty, struct file * filp)
1721 struct async_struct *info;
1724 retval = get_async_struct(tty->index, &info);
1728 tty->driver_data = info;
1730 if (serial_paranoia_check(info, tty->name, "rs_open"))
1733 #ifdef SERIAL_DEBUG_OPEN
1734 printk("rs_open %s, count = %d\n", tty->name, info->state->count);
1736 info->tty->low_latency = (info->state->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1739 * If the port is the middle of closing, bail out now
1741 if (tty_hung_up_p(filp) ||
1742 (info->state->flags & ASYNC_CLOSING)) {
1743 if (info->state->flags & ASYNC_CLOSING)
1744 interruptible_sleep_on(&info->close_wait);
1745 #ifdef SERIAL_DO_RESTART
1746 return ((info->state->flags & ASYNC_HUP_NOTIFY) ?
1747 -EAGAIN : -ERESTARTSYS);
1754 * Start up serial port
1756 retval = startup(info);
1761 retval = block_til_ready(tty, filp, info);
1763 #ifdef SERIAL_DEBUG_OPEN
1764 printk("rs_open returning after block_til_ready with %d\n",
1770 #ifdef SERIAL_DEBUG_OPEN
1771 printk("rs_open %s successful...", tty->name);
1777 * /proc fs routines....
1780 static inline void line_info(struct seq_file *m, struct serial_state *state)
1782 struct async_struct *info = state->info, scr_info;
1783 char stat_buf[30], control, status;
1784 unsigned long flags;
1786 seq_printf(m, "%d: uart:amiga_builtin",state->line);
1789 * Figure out the current RS-232 lines
1792 info = &scr_info; /* This is just for serial_{in,out} */
1797 local_irq_save(flags);
1799 control = info ? info->MCR : status;
1800 local_irq_restore(flags);
1804 if(!(control & SER_RTS))
1805 strcat(stat_buf, "|RTS");
1806 if(!(status & SER_CTS))
1807 strcat(stat_buf, "|CTS");
1808 if(!(control & SER_DTR))
1809 strcat(stat_buf, "|DTR");
1810 if(!(status & SER_DSR))
1811 strcat(stat_buf, "|DSR");
1812 if(!(status & SER_DCD))
1813 strcat(stat_buf, "|CD");
1816 seq_printf(m, " baud:%d", state->baud_base / info->quot);
1819 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1821 if (state->icount.frame)
1822 seq_printf(m, " fe:%d", state->icount.frame);
1824 if (state->icount.parity)
1825 seq_printf(m, " pe:%d", state->icount.parity);
1827 if (state->icount.brk)
1828 seq_printf(m, " brk:%d", state->icount.brk);
1830 if (state->icount.overrun)
1831 seq_printf(m, " oe:%d", state->icount.overrun);
1834 * Last thing is the RS-232 status lines
1836 seq_printf(m, " %s\n", stat_buf+1);
1839 static int rs_proc_show(struct seq_file *m, void *v)
1841 seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
1842 line_info(m, &rs_table[0]);
1846 static int rs_proc_open(struct inode *inode, struct file *file)
1848 return single_open(file, rs_proc_show, NULL);
1851 static const struct file_operations rs_proc_fops = {
1852 .owner = THIS_MODULE,
1853 .open = rs_proc_open,
1855 .llseek = seq_lseek,
1856 .release = single_release,
1860 * ---------------------------------------------------------------------
1861 * rs_init() and friends
1863 * rs_init() is called at boot-time to initialize the serial driver.
1864 * ---------------------------------------------------------------------
1868 * This routine prints out the appropriate serial driver version
1869 * number, and identifies which options were configured into this
1872 static void show_serial_version(void)
1874 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1878 static const struct tty_operations serial_ops = {
1882 .put_char = rs_put_char,
1883 .flush_chars = rs_flush_chars,
1884 .write_room = rs_write_room,
1885 .chars_in_buffer = rs_chars_in_buffer,
1886 .flush_buffer = rs_flush_buffer,
1888 .throttle = rs_throttle,
1889 .unthrottle = rs_unthrottle,
1890 .set_termios = rs_set_termios,
1893 .hangup = rs_hangup,
1894 .break_ctl = rs_break,
1895 .send_xchar = rs_send_xchar,
1896 .wait_until_sent = rs_wait_until_sent,
1897 .tiocmget = rs_tiocmget,
1898 .tiocmset = rs_tiocmset,
1899 .get_icount = rs_get_icount,
1900 .proc_fops = &rs_proc_fops,
1904 * The serial driver boot-time initialization code!
1906 static int __init amiga_serial_probe(struct platform_device *pdev)
1908 unsigned long flags;
1909 struct serial_state * state;
1912 serial_driver = alloc_tty_driver(NR_PORTS);
1918 show_serial_version();
1920 /* Initialize the tty_driver structure */
1922 serial_driver->driver_name = "amiserial";
1923 serial_driver->name = "ttyS";
1924 serial_driver->major = TTY_MAJOR;
1925 serial_driver->minor_start = 64;
1926 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1927 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1928 serial_driver->init_termios = tty_std_termios;
1929 serial_driver->init_termios.c_cflag =
1930 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1931 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1932 tty_set_operations(serial_driver, &serial_ops);
1934 error = tty_register_driver(serial_driver);
1936 goto fail_put_tty_driver;
1939 state->port = (int)&custom.serdatr; /* Just to give it a value */
1941 state->custom_divisor = 0;
1942 state->close_delay = 5*HZ/10;
1943 state->closing_wait = 30*HZ;
1944 state->icount.cts = state->icount.dsr =
1945 state->icount.rng = state->icount.dcd = 0;
1946 state->icount.rx = state->icount.tx = 0;
1947 state->icount.frame = state->icount.parity = 0;
1948 state->icount.overrun = state->icount.brk = 0;
1950 printk(KERN_INFO "ttyS%d is the amiga builtin serial port\n",
1953 /* Hardware set up */
1955 state->baud_base = amiga_colorclock;
1956 state->xmit_fifo_size = 1;
1958 /* set ISRs, and then disable the rx interrupts */
1959 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
1961 goto fail_unregister;
1963 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
1964 "serial RX", state);
1968 local_irq_save(flags);
1970 /* turn off Rx and Tx interrupts */
1971 custom.intena = IF_RBF | IF_TBE;
1974 /* clear any pending interrupt */
1975 custom.intreq = IF_RBF | IF_TBE;
1978 local_irq_restore(flags);
1981 * set the appropriate directions for the modem control flags,
1982 * and clear RTS and DTR
1984 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
1985 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
1987 platform_set_drvdata(pdev, state);
1992 free_irq(IRQ_AMIGA_TBE, state);
1994 tty_unregister_driver(serial_driver);
1995 fail_put_tty_driver:
1996 put_tty_driver(serial_driver);
2000 static int __exit amiga_serial_remove(struct platform_device *pdev)
2003 struct serial_state *state = platform_get_drvdata(pdev);
2004 struct async_struct *info = state->info;
2006 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2007 if ((error = tty_unregister_driver(serial_driver)))
2008 printk("SERIAL: failed to unregister serial driver (%d)\n",
2010 put_tty_driver(serial_driver);
2012 rs_table[0].info = NULL;
2015 free_irq(IRQ_AMIGA_TBE, rs_table);
2016 free_irq(IRQ_AMIGA_RBF, rs_table);
2018 platform_set_drvdata(pdev, NULL);
2023 static struct platform_driver amiga_serial_driver = {
2024 .remove = __exit_p(amiga_serial_remove),
2026 .name = "amiga-serial",
2027 .owner = THIS_MODULE,
2031 static int __init amiga_serial_init(void)
2033 return platform_driver_probe(&amiga_serial_driver, amiga_serial_probe);
2036 module_init(amiga_serial_init);
2038 static void __exit amiga_serial_exit(void)
2040 platform_driver_unregister(&amiga_serial_driver);
2043 module_exit(amiga_serial_exit);
2046 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
2049 * ------------------------------------------------------------
2050 * Serial console driver
2051 * ------------------------------------------------------------
2054 static void amiga_serial_putc(char c)
2056 custom.serdat = (unsigned char)c | 0x100;
2057 while (!(custom.serdatr & 0x2000))
2062 * Print a string to the serial port trying not to disturb
2063 * any possible real use of the port...
2065 * The console must be locked when we get here.
2067 static void serial_console_write(struct console *co, const char *s,
2070 unsigned short intena = custom.intenar;
2072 custom.intena = IF_TBE;
2076 amiga_serial_putc('\r');
2077 amiga_serial_putc(*s++);
2080 custom.intena = IF_SETCLR | (intena & IF_TBE);
2083 static struct tty_driver *serial_console_device(struct console *c, int *index)
2086 return serial_driver;
2089 static struct console sercons = {
2091 .write = serial_console_write,
2092 .device = serial_console_device,
2093 .flags = CON_PRINTBUFFER,
2100 static int __init amiserial_console_init(void)
2102 register_console(&sercons);
2105 console_initcall(amiserial_console_init);
2107 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
2109 MODULE_LICENSE("GPL");
2110 MODULE_ALIAS("platform:amiga-serial");