1 // SPDX-License-Identifier: GPL-2.0
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
25 #include <linux/delay.h>
27 /* Set of debugging defines */
29 #undef SERIAL_DEBUG_INTR
30 #undef SERIAL_DEBUG_OPEN
31 #undef SERIAL_DEBUG_FLOW
32 #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
36 #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
37 #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
38 tty->name, (info->tport.flags), serial_driver->refcount,info->count,tty->count,s)
44 * End of serial driver configuration section.
47 #include <linux/module.h>
49 #include <linux/types.h>
50 #include <linux/serial.h>
51 #include <linux/serial_reg.h>
52 static char *serial_version = "4.30";
54 #include <linux/errno.h>
55 #include <linux/signal.h>
56 #include <linux/sched.h>
57 #include <linux/kernel.h>
58 #include <linux/timer.h>
59 #include <linux/interrupt.h>
60 #include <linux/tty.h>
61 #include <linux/tty_flip.h>
62 #include <linux/circ_buf.h>
63 #include <linux/console.h>
64 #include <linux/major.h>
65 #include <linux/string.h>
66 #include <linux/fcntl.h>
67 #include <linux/ptrace.h>
68 #include <linux/ioport.h>
70 #include <linux/seq_file.h>
71 #include <linux/slab.h>
72 #include <linux/init.h>
73 #include <linux/bitops.h>
74 #include <linux/platform_device.h>
76 #include <asm/setup.h>
81 #include <asm/amigahw.h>
82 #include <asm/amigaints.h>
85 struct tty_port tport;
87 struct async_icount icount;
94 int ignore_status_mask;
97 int IER; /* Interrupt Enable Register */
98 int MCR; /* Modem control register */
99 int x_char; /* xon/xoff character */
102 #define custom amiga_custom
103 static char *serial_name = "Amiga-builtin serial driver";
105 static struct tty_driver *serial_driver;
107 /* number of characters left in xmit buffer before we ask for more */
108 #define WAKEUP_CHARS 256
110 static unsigned char current_ctl_bits;
112 static void change_speed(struct tty_struct *tty, struct serial_state *info,
113 struct ktermios *old);
114 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
117 static struct serial_state rs_table[1];
119 #define NR_PORTS ARRAY_SIZE(rs_table)
121 #include <linux/uaccess.h>
123 #define serial_isroot() (capable(CAP_SYS_ADMIN))
125 /* some serial hardware definitions */
126 #define SDR_OVRUN (1<<15)
127 #define SDR_RBF (1<<14)
128 #define SDR_TBE (1<<13)
129 #define SDR_TSRE (1<<12)
131 #define SERPER_PARENB (1<<15)
133 #define AC_SETCLR (1<<15)
134 #define AC_UARTBRK (1<<11)
136 #define SER_DTR (1<<7)
137 #define SER_RTS (1<<6)
138 #define SER_DCD (1<<5)
139 #define SER_CTS (1<<4)
140 #define SER_DSR (1<<3)
142 static __inline__ void rtsdtr_ctrl(int bits)
144 ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
148 * ------------------------------------------------------------
149 * rs_stop() and rs_start()
151 * This routines are called before setting or resetting tty->stopped.
152 * They enable or disable transmitter interrupts, as necessary.
153 * ------------------------------------------------------------
155 static void rs_stop(struct tty_struct *tty)
157 struct serial_state *info = tty->driver_data;
160 local_irq_save(flags);
161 if (info->IER & UART_IER_THRI) {
162 info->IER &= ~UART_IER_THRI;
163 /* disable Tx interrupt and remove any pending interrupts */
164 custom.intena = IF_TBE;
166 custom.intreq = IF_TBE;
169 local_irq_restore(flags);
172 static void rs_start(struct tty_struct *tty)
174 struct serial_state *info = tty->driver_data;
177 local_irq_save(flags);
178 if (info->xmit.head != info->xmit.tail
180 && !(info->IER & UART_IER_THRI)) {
181 info->IER |= UART_IER_THRI;
182 custom.intena = IF_SETCLR | IF_TBE;
184 /* set a pending Tx Interrupt, transmitter should restart now */
185 custom.intreq = IF_SETCLR | IF_TBE;
188 local_irq_restore(flags);
192 * ----------------------------------------------------------------------
194 * Here starts the interrupt handling routines. All of the following
195 * subroutines are declared as inline and are folded into
196 * rs_interrupt(). They were separated out for readability's sake.
198 * Note: rs_interrupt() is a "fast" interrupt, which means that it
199 * runs with interrupts turned off. People who may want to modify
200 * rs_interrupt() should try to keep the interrupt handler as fast as
201 * possible. After you are done making modifications, it is not a bad
204 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
206 * and look at the resulting assemble code in serial.s.
208 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
209 * -----------------------------------------------------------------------
212 static void receive_chars(struct serial_state *info)
216 unsigned char ch, flag;
217 struct async_icount *icount;
220 icount = &info->icount;
222 status = UART_LSR_DR; /* We obviously have a character! */
223 serdatr = custom.serdatr;
225 custom.intreq = IF_RBF;
228 if((serdatr & 0x1ff) == 0)
229 status |= UART_LSR_BI;
230 if(serdatr & SDR_OVRUN)
231 status |= UART_LSR_OE;
236 #ifdef SERIAL_DEBUG_INTR
237 printk("DR%02x:%02x...", ch, status);
242 * We don't handle parity or frame errors - but I have left
243 * the code in, since I'm not sure that the errors can't be
247 if (status & (UART_LSR_BI | UART_LSR_PE |
248 UART_LSR_FE | UART_LSR_OE)) {
250 * For statistics only
252 if (status & UART_LSR_BI) {
253 status &= ~(UART_LSR_FE | UART_LSR_PE);
255 } else if (status & UART_LSR_PE)
257 else if (status & UART_LSR_FE)
259 if (status & UART_LSR_OE)
263 * Now check to see if character should be
264 * ignored, and mask off conditions which
267 if (status & info->ignore_status_mask)
270 status &= info->read_status_mask;
272 if (status & (UART_LSR_BI)) {
273 #ifdef SERIAL_DEBUG_INTR
274 printk("handling break....");
277 if (info->tport.flags & ASYNC_SAK)
278 do_SAK(info->tport.tty);
279 } else if (status & UART_LSR_PE)
281 else if (status & UART_LSR_FE)
283 if (status & UART_LSR_OE) {
285 * Overrun is special, since it's
286 * reported immediately, and doesn't
287 * affect the current character
292 tty_insert_flip_char(&info->tport, ch, flag);
294 tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN);
295 tty_flip_buffer_push(&info->tport);
300 static void transmit_chars(struct serial_state *info)
302 custom.intreq = IF_TBE;
305 custom.serdat = info->x_char | 0x100;
311 if (info->xmit.head == info->xmit.tail
312 || info->tport.tty->stopped
313 || info->tport.tty->hw_stopped) {
314 info->IER &= ~UART_IER_THRI;
315 custom.intena = IF_TBE;
320 custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
322 info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
325 if (CIRC_CNT(info->xmit.head,
327 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
328 tty_wakeup(info->tport.tty);
330 #ifdef SERIAL_DEBUG_INTR
333 if (info->xmit.head == info->xmit.tail) {
334 custom.intena = IF_TBE;
336 info->IER &= ~UART_IER_THRI;
340 static void check_modem_status(struct serial_state *info)
342 struct tty_port *port = &info->tport;
343 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
344 unsigned char dstatus;
345 struct async_icount *icount;
347 /* Determine bits that have changed */
348 dstatus = status ^ current_ctl_bits;
349 current_ctl_bits = status;
352 icount = &info->icount;
353 /* update input line counters */
354 if (dstatus & SER_DSR)
356 if (dstatus & SER_DCD) {
359 if (dstatus & SER_CTS)
361 wake_up_interruptible(&port->delta_msr_wait);
364 if (tty_port_check_carrier(port) && (dstatus & SER_DCD)) {
365 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
366 printk("ttyS%d CD now %s...", info->line,
367 (!(status & SER_DCD)) ? "on" : "off");
369 if (!(status & SER_DCD))
370 wake_up_interruptible(&port->open_wait);
372 #ifdef SERIAL_DEBUG_OPEN
373 printk("doing serial hangup...");
376 tty_hangup(port->tty);
379 if (tty_port_cts_enabled(port)) {
380 if (port->tty->hw_stopped) {
381 if (!(status & SER_CTS)) {
382 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
383 printk("CTS tx start...");
385 port->tty->hw_stopped = 0;
386 info->IER |= UART_IER_THRI;
387 custom.intena = IF_SETCLR | IF_TBE;
389 /* set a pending Tx Interrupt, transmitter should restart now */
390 custom.intreq = IF_SETCLR | IF_TBE;
392 tty_wakeup(port->tty);
396 if ((status & SER_CTS)) {
397 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
398 printk("CTS tx stop...");
400 port->tty->hw_stopped = 1;
401 info->IER &= ~UART_IER_THRI;
402 /* disable Tx interrupt and remove any pending interrupts */
403 custom.intena = IF_TBE;
405 custom.intreq = IF_TBE;
412 static irqreturn_t ser_vbl_int( int irq, void *data)
414 /* vbl is just a periodic interrupt we tie into to update modem status */
415 struct serial_state *info = data;
417 * TBD - is it better to unregister from this interrupt or to
418 * ignore it if MSI is clear ?
420 if(info->IER & UART_IER_MSI)
421 check_modem_status(info);
425 static irqreturn_t ser_rx_int(int irq, void *dev_id)
427 struct serial_state *info = dev_id;
429 #ifdef SERIAL_DEBUG_INTR
430 printk("ser_rx_int...");
433 if (!info->tport.tty)
437 #ifdef SERIAL_DEBUG_INTR
443 static irqreturn_t ser_tx_int(int irq, void *dev_id)
445 struct serial_state *info = dev_id;
447 if (custom.serdatr & SDR_TBE) {
448 #ifdef SERIAL_DEBUG_INTR
449 printk("ser_tx_int...");
452 if (!info->tport.tty)
455 transmit_chars(info);
456 #ifdef SERIAL_DEBUG_INTR
464 * -------------------------------------------------------------------
465 * Here ends the serial interrupt routines.
466 * -------------------------------------------------------------------
470 * ---------------------------------------------------------------
471 * Low level utility subroutines for the serial driver: routines to
472 * figure out the appropriate timeout for an interrupt chain, routines
473 * to initialize and startup a serial port, and routines to shutdown a
474 * serial port. Useful stuff like that.
475 * ---------------------------------------------------------------
478 static int startup(struct tty_struct *tty, struct serial_state *info)
480 struct tty_port *port = &info->tport;
485 page = get_zeroed_page(GFP_KERNEL);
489 local_irq_save(flags);
491 if (tty_port_initialized(port)) {
499 info->xmit.buf = (unsigned char *) page;
501 #ifdef SERIAL_DEBUG_OPEN
502 printk("starting up ttys%d ...", info->line);
505 /* Clear anything in the input buffer */
507 custom.intreq = IF_RBF;
510 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
512 if (serial_isroot()) {
513 set_bit(TTY_IO_ERROR, &tty->flags);
519 /* enable both Rx and Tx interrupts */
520 custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
522 info->IER = UART_IER_MSI;
524 /* remember current state of the DCD and CTS bits */
525 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
529 info->MCR = SER_DTR | SER_RTS;
530 rtsdtr_ctrl(info->MCR);
532 clear_bit(TTY_IO_ERROR, &tty->flags);
533 info->xmit.head = info->xmit.tail = 0;
536 * and set the speed of the serial port
538 change_speed(tty, info, NULL);
540 tty_port_set_initialized(port, 1);
541 local_irq_restore(flags);
545 local_irq_restore(flags);
550 * This routine will shutdown a serial port; interrupts are disabled, and
551 * DTR is dropped if the hangup on close termio flag is on.
553 static void shutdown(struct tty_struct *tty, struct serial_state *info)
556 struct serial_state *state;
558 if (!tty_port_initialized(&info->tport))
563 #ifdef SERIAL_DEBUG_OPEN
564 printk("Shutting down serial port %d ....\n", info->line);
567 local_irq_save(flags); /* Disable interrupts */
570 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
571 * here so the queue might never be waken up
573 wake_up_interruptible(&info->tport.delta_msr_wait);
576 * Free the IRQ, if necessary
578 free_irq(IRQ_AMIGA_VERTB, info);
580 if (info->xmit.buf) {
581 free_page((unsigned long) info->xmit.buf);
582 info->xmit.buf = NULL;
586 custom.intena = IF_RBF | IF_TBE;
589 /* disable break condition */
590 custom.adkcon = AC_UARTBRK;
594 info->MCR &= ~(SER_DTR|SER_RTS);
595 rtsdtr_ctrl(info->MCR);
597 set_bit(TTY_IO_ERROR, &tty->flags);
599 tty_port_set_initialized(&info->tport, 0);
600 local_irq_restore(flags);
605 * This routine is called to set the UART divisor registers to match
606 * the specified baud rate for a serial port.
608 static void change_speed(struct tty_struct *tty, struct serial_state *info,
609 struct ktermios *old_termios)
611 struct tty_port *port = &info->tport;
612 int quot = 0, baud_base, baud;
613 unsigned cflag, cval = 0;
617 cflag = tty->termios.c_cflag;
619 /* Byte size is always 8 bits plus parity bit if requested */
622 if (cflag & CSTOPB) {
626 if (cflag & PARENB) {
627 cval |= UART_LCR_PARITY;
630 if (!(cflag & PARODD))
631 cval |= UART_LCR_EPAR;
634 cval |= UART_LCR_SPAR;
637 /* Determine divisor based on baud rate */
638 baud = tty_get_baud_rate(tty);
640 baud = 9600; /* B0 transition handled in rs_set_termios */
641 baud_base = info->baud_base;
642 if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
643 quot = info->custom_divisor;
646 /* Special case since 134 is really 134.5 */
647 quot = (2*baud_base / 269);
649 quot = baud_base / baud;
651 /* If the quotient is zero refuse the change */
652 if (!quot && old_termios) {
653 /* FIXME: Will need updating for new tty in the end */
654 tty->termios.c_cflag &= ~CBAUD;
655 tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD);
656 baud = tty_get_baud_rate(tty);
660 (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
661 quot = info->custom_divisor;
664 /* Special case since 134 is really 134.5 */
665 quot = (2*baud_base / 269);
667 quot = baud_base / baud;
670 /* As a last resort, if the quotient is zero, default to 9600 bps */
672 quot = baud_base / 9600;
674 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
675 info->timeout += HZ/50; /* Add .02 seconds of slop */
677 /* CTS flow control flag and modem status interrupts */
678 info->IER &= ~UART_IER_MSI;
679 if (port->flags & ASYNC_HARDPPS_CD)
680 info->IER |= UART_IER_MSI;
681 tty_port_set_cts_flow(port, cflag & CRTSCTS);
683 info->IER |= UART_IER_MSI;
684 tty_port_set_check_carrier(port, ~cflag & CLOCAL);
686 info->IER |= UART_IER_MSI;
688 * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
692 * Set up parity check flag
695 info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
697 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
698 if (I_BRKINT(tty) || I_PARMRK(tty))
699 info->read_status_mask |= UART_LSR_BI;
702 * Characters to ignore
704 info->ignore_status_mask = 0;
706 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
708 info->ignore_status_mask |= UART_LSR_BI;
710 * If we're ignore parity and break indicators, ignore
711 * overruns too. (For real raw support).
714 info->ignore_status_mask |= UART_LSR_OE;
717 * !!! ignore all characters if CREAD is not set
719 if ((cflag & CREAD) == 0)
720 info->ignore_status_mask |= UART_LSR_DR;
721 local_irq_save(flags);
726 /* Set up the baud rate */
729 /* Enable or disable parity bit */
731 if(cval & UART_LCR_PARITY)
732 serper |= (SERPER_PARENB);
734 custom.serper = serper;
738 local_irq_restore(flags);
741 static int rs_put_char(struct tty_struct *tty, unsigned char ch)
743 struct serial_state *info;
746 info = tty->driver_data;
751 local_irq_save(flags);
752 if (CIRC_SPACE(info->xmit.head,
754 SERIAL_XMIT_SIZE) == 0) {
755 local_irq_restore(flags);
759 info->xmit.buf[info->xmit.head++] = ch;
760 info->xmit.head &= SERIAL_XMIT_SIZE-1;
761 local_irq_restore(flags);
765 static void rs_flush_chars(struct tty_struct *tty)
767 struct serial_state *info = tty->driver_data;
770 if (info->xmit.head == info->xmit.tail
776 local_irq_save(flags);
777 info->IER |= UART_IER_THRI;
778 custom.intena = IF_SETCLR | IF_TBE;
780 /* set a pending Tx Interrupt, transmitter should restart now */
781 custom.intreq = IF_SETCLR | IF_TBE;
783 local_irq_restore(flags);
786 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
789 struct serial_state *info = tty->driver_data;
795 local_irq_save(flags);
797 c = CIRC_SPACE_TO_END(info->xmit.head,
805 memcpy(info->xmit.buf + info->xmit.head, buf, c);
806 info->xmit.head = ((info->xmit.head + c) &
807 (SERIAL_XMIT_SIZE-1));
812 local_irq_restore(flags);
814 if (info->xmit.head != info->xmit.tail
817 && !(info->IER & UART_IER_THRI)) {
818 info->IER |= UART_IER_THRI;
820 custom.intena = IF_SETCLR | IF_TBE;
822 /* set a pending Tx Interrupt, transmitter should restart now */
823 custom.intreq = IF_SETCLR | IF_TBE;
825 local_irq_restore(flags);
830 static int rs_write_room(struct tty_struct *tty)
832 struct serial_state *info = tty->driver_data;
834 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
837 static int rs_chars_in_buffer(struct tty_struct *tty)
839 struct serial_state *info = tty->driver_data;
841 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
844 static void rs_flush_buffer(struct tty_struct *tty)
846 struct serial_state *info = tty->driver_data;
849 local_irq_save(flags);
850 info->xmit.head = info->xmit.tail = 0;
851 local_irq_restore(flags);
856 * This function is used to send a high-priority XON/XOFF character to
859 static void rs_send_xchar(struct tty_struct *tty, char ch)
861 struct serial_state *info = tty->driver_data;
866 /* Make sure transmit interrupts are on */
869 local_irq_save(flags);
870 if(!(custom.intenar & IF_TBE)) {
871 custom.intena = IF_SETCLR | IF_TBE;
873 /* set a pending Tx Interrupt, transmitter should restart now */
874 custom.intreq = IF_SETCLR | IF_TBE;
877 local_irq_restore(flags);
879 info->IER |= UART_IER_THRI;
884 * ------------------------------------------------------------
887 * This routine is called by the upper-layer tty layer to signal that
888 * incoming characters should be throttled.
889 * ------------------------------------------------------------
891 static void rs_throttle(struct tty_struct * tty)
893 struct serial_state *info = tty->driver_data;
895 #ifdef SERIAL_DEBUG_THROTTLE
896 printk("throttle %s ....\n", tty_name(tty));
900 rs_send_xchar(tty, STOP_CHAR(tty));
903 info->MCR &= ~SER_RTS;
905 local_irq_save(flags);
906 rtsdtr_ctrl(info->MCR);
907 local_irq_restore(flags);
910 static void rs_unthrottle(struct tty_struct * tty)
912 struct serial_state *info = tty->driver_data;
914 #ifdef SERIAL_DEBUG_THROTTLE
915 printk("unthrottle %s ....\n", tty_name(tty));
922 rs_send_xchar(tty, START_CHAR(tty));
925 info->MCR |= SER_RTS;
926 local_irq_save(flags);
927 rtsdtr_ctrl(info->MCR);
928 local_irq_restore(flags);
932 * ------------------------------------------------------------
933 * rs_ioctl() and friends
934 * ------------------------------------------------------------
937 static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
939 struct serial_state *state = tty->driver_data;
942 ss->line = tty->index;
943 ss->port = state->port;
944 ss->flags = state->tport.flags;
945 ss->xmit_fifo_size = state->xmit_fifo_size;
946 ss->baud_base = state->baud_base;
947 ss->close_delay = state->tport.close_delay;
948 ss->closing_wait = state->tport.closing_wait;
949 ss->custom_divisor = state->custom_divisor;
954 static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
956 struct serial_state *state = tty->driver_data;
957 struct tty_port *port = &state->tport;
962 change_spd = ((ss->flags ^ port->flags) & ASYNC_SPD_MASK) ||
963 ss->custom_divisor != state->custom_divisor;
964 if (ss->irq || ss->port != state->port ||
965 ss->xmit_fifo_size != state->xmit_fifo_size) {
970 if (!serial_isroot()) {
971 if ((ss->baud_base != state->baud_base) ||
972 (ss->close_delay != port->close_delay) ||
973 (ss->closing_wait != port->closing_wait) ||
974 (ss->xmit_fifo_size != state->xmit_fifo_size) ||
975 ((ss->flags & ~ASYNC_USR_MASK) !=
976 (port->flags & ~ASYNC_USR_MASK))) {
980 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
981 (ss->flags & ASYNC_USR_MASK));
982 state->custom_divisor = ss->custom_divisor;
986 if (ss->baud_base < 9600) {
992 * OK, past this point, all the error checking has been done.
993 * At this point, we start making changes.....
996 state->baud_base = ss->baud_base;
997 port->flags = ((port->flags & ~ASYNC_FLAGS) |
998 (ss->flags & ASYNC_FLAGS));
999 state->custom_divisor = ss->custom_divisor;
1000 port->close_delay = ss->close_delay * HZ/100;
1001 port->closing_wait = ss->closing_wait * HZ/100;
1002 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1005 if (tty_port_initialized(port)) {
1007 /* warn about deprecation unless clearing */
1008 if (ss->flags & ASYNC_SPD_MASK)
1009 dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n");
1010 change_speed(tty, state, NULL);
1013 retval = startup(tty, state);
1019 * get_lsr_info - get line status register info
1021 * Purpose: Let user call ioctl() to get info when the UART physically
1022 * is emptied. On bus types like RS485, the transmitter must
1023 * release the bus after transmitting. This must be done when
1024 * the transmit shift register is empty, not be done when the
1025 * transmit holding register is empty. This functionality
1026 * allows an RS485 driver to be written in user space.
1028 static int get_lsr_info(struct serial_state *info, unsigned int __user *value)
1030 unsigned char status;
1031 unsigned int result;
1032 unsigned long flags;
1034 local_irq_save(flags);
1035 status = custom.serdatr;
1037 local_irq_restore(flags);
1038 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1039 if (copy_to_user(value, &result, sizeof(int)))
1045 static int rs_tiocmget(struct tty_struct *tty)
1047 struct serial_state *info = tty->driver_data;
1048 unsigned char control, status;
1049 unsigned long flags;
1051 if (tty_io_error(tty))
1054 control = info->MCR;
1055 local_irq_save(flags);
1057 local_irq_restore(flags);
1058 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1059 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1060 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1061 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1062 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1065 static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
1068 struct serial_state *info = tty->driver_data;
1069 unsigned long flags;
1071 if (tty_io_error(tty))
1074 local_irq_save(flags);
1075 if (set & TIOCM_RTS)
1076 info->MCR |= SER_RTS;
1077 if (set & TIOCM_DTR)
1078 info->MCR |= SER_DTR;
1079 if (clear & TIOCM_RTS)
1080 info->MCR &= ~SER_RTS;
1081 if (clear & TIOCM_DTR)
1082 info->MCR &= ~SER_DTR;
1083 rtsdtr_ctrl(info->MCR);
1084 local_irq_restore(flags);
1089 * rs_break() --- routine which turns the break handling on or off
1091 static int rs_break(struct tty_struct *tty, int break_state)
1093 unsigned long flags;
1095 local_irq_save(flags);
1096 if (break_state == -1)
1097 custom.adkcon = AC_SETCLR | AC_UARTBRK;
1099 custom.adkcon = AC_UARTBRK;
1101 local_irq_restore(flags);
1106 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1107 * Return: write counters to the user passed counter struct
1108 * NB: both 1->0 and 0->1 transitions are counted except for
1109 * RI where only 0->1 is counted.
1111 static int rs_get_icount(struct tty_struct *tty,
1112 struct serial_icounter_struct *icount)
1114 struct serial_state *info = tty->driver_data;
1115 struct async_icount cnow;
1116 unsigned long flags;
1118 local_irq_save(flags);
1119 cnow = info->icount;
1120 local_irq_restore(flags);
1121 icount->cts = cnow.cts;
1122 icount->dsr = cnow.dsr;
1123 icount->rng = cnow.rng;
1124 icount->dcd = cnow.dcd;
1125 icount->rx = cnow.rx;
1126 icount->tx = cnow.tx;
1127 icount->frame = cnow.frame;
1128 icount->overrun = cnow.overrun;
1129 icount->parity = cnow.parity;
1130 icount->brk = cnow.brk;
1131 icount->buf_overrun = cnow.buf_overrun;
1136 static int rs_ioctl(struct tty_struct *tty,
1137 unsigned int cmd, unsigned long arg)
1139 struct serial_state *info = tty->driver_data;
1140 struct async_icount cprev, cnow; /* kernel counter temps */
1141 void __user *argp = (void __user *)arg;
1142 unsigned long flags;
1146 if ((cmd != TIOCSERCONFIG) &&
1147 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1148 if (tty_io_error(tty))
1156 case TIOCSERGETLSR: /* Get line status register */
1157 return get_lsr_info(info, argp);
1160 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1161 * - mask passed in arg for lines of interest
1162 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1163 * Caller should use TIOCGICOUNT to see which one it was
1166 local_irq_save(flags);
1167 /* note the counters on entry */
1168 cprev = info->icount;
1169 local_irq_restore(flags);
1171 prepare_to_wait(&info->tport.delta_msr_wait,
1172 &wait, TASK_INTERRUPTIBLE);
1173 local_irq_save(flags);
1174 cnow = info->icount; /* atomic copy */
1175 local_irq_restore(flags);
1176 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1177 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
1178 ret = -EIO; /* no change => error */
1181 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1182 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1183 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1184 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1189 /* see if a signal did it */
1190 if (signal_pending(current)) {
1196 finish_wait(&info->tport.delta_msr_wait, &wait);
1200 return -ENOIOCTLCMD;
1205 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1207 struct serial_state *info = tty->driver_data;
1208 unsigned long flags;
1209 unsigned int cflag = tty->termios.c_cflag;
1211 change_speed(tty, info, old_termios);
1213 /* Handle transition to B0 status */
1214 if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) {
1215 info->MCR &= ~(SER_DTR|SER_RTS);
1216 local_irq_save(flags);
1217 rtsdtr_ctrl(info->MCR);
1218 local_irq_restore(flags);
1221 /* Handle transition away from B0 status */
1222 if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
1223 info->MCR |= SER_DTR;
1224 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
1225 info->MCR |= SER_RTS;
1226 local_irq_save(flags);
1227 rtsdtr_ctrl(info->MCR);
1228 local_irq_restore(flags);
1231 /* Handle turning off CRTSCTS */
1232 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1233 tty->hw_stopped = 0;
1239 * No need to wake up processes in open wait, since they
1240 * sample the CLOCAL flag once, and don't recheck it.
1241 * XXX It's not clear whether the current behavior is correct
1242 * or not. Hence, this may change.....
1244 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1245 wake_up_interruptible(&info->open_wait);
1250 * ------------------------------------------------------------
1253 * This routine is called when the serial port gets closed. First, we
1254 * wait for the last remaining data to be sent. Then, we unlink its
1255 * async structure from the interrupt chain if necessary, and we free
1256 * that IRQ if nothing is left in the chain.
1257 * ------------------------------------------------------------
1259 static void rs_close(struct tty_struct *tty, struct file * filp)
1261 struct serial_state *state = tty->driver_data;
1262 struct tty_port *port = &state->tport;
1264 if (tty_port_close_start(port, tty, filp) == 0)
1268 * At this point we stop accepting input. To do this, we
1269 * disable the receive line status interrupts, and tell the
1270 * interrupt driver to stop checking the data ready bit in the
1271 * line status register.
1273 state->read_status_mask &= ~UART_LSR_DR;
1274 if (tty_port_initialized(port)) {
1275 /* disable receive interrupts */
1276 custom.intena = IF_RBF;
1278 /* clear any pending receive interrupt */
1279 custom.intreq = IF_RBF;
1283 * Before we drop DTR, make sure the UART transmitter
1284 * has completely drained; this is especially
1285 * important if there is a transmit FIFO!
1287 rs_wait_until_sent(tty, state->timeout);
1289 shutdown(tty, state);
1290 rs_flush_buffer(tty);
1292 tty_ldisc_flush(tty);
1295 tty_port_close_end(port, tty);
1299 * rs_wait_until_sent() --- wait until the transmitter is empty
1301 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1303 struct serial_state *info = tty->driver_data;
1304 unsigned long orig_jiffies, char_time;
1307 if (info->xmit_fifo_size == 0)
1308 return; /* Just in case.... */
1310 orig_jiffies = jiffies;
1313 * Set the check interval to be 1/5 of the estimated time to
1314 * send a single character, and make it at least 1. The check
1315 * interval should also be less than the timeout.
1317 * Note: we have to use pretty tight timings here to satisfy
1320 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1321 char_time = char_time / 5;
1325 char_time = min_t(unsigned long, char_time, timeout);
1327 * If the transmitter hasn't cleared in twice the approximate
1328 * amount of time to send the entire FIFO, it probably won't
1329 * ever clear. This assumes the UART isn't doing flow
1330 * control, which is currently the case. Hence, if it ever
1331 * takes longer than info->timeout, this is probably due to a
1332 * UART bug of some kind. So, we clamp the timeout parameter at
1335 if (!timeout || timeout > 2*info->timeout)
1336 timeout = 2*info->timeout;
1337 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1338 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1339 printk("jiff=%lu...", jiffies);
1341 while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1342 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1343 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1345 msleep_interruptible(jiffies_to_msecs(char_time));
1346 if (signal_pending(current))
1348 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1351 __set_current_state(TASK_RUNNING);
1353 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1354 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1359 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1361 static void rs_hangup(struct tty_struct *tty)
1363 struct serial_state *info = tty->driver_data;
1365 rs_flush_buffer(tty);
1366 shutdown(tty, info);
1367 info->tport.count = 0;
1368 tty_port_set_active(&info->tport, 0);
1369 info->tport.tty = NULL;
1370 wake_up_interruptible(&info->tport.open_wait);
1374 * This routine is called whenever a serial port is opened. It
1375 * enables interrupts for a serial port, linking in its async structure into
1376 * the IRQ chain. It also performs the serial-specific
1377 * initialization for the tty structure.
1379 static int rs_open(struct tty_struct *tty, struct file * filp)
1381 struct serial_state *info = rs_table + tty->index;
1382 struct tty_port *port = &info->tport;
1387 tty->driver_data = info;
1390 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1392 retval = startup(tty, info);
1397 return tty_port_block_til_ready(port, tty, filp);
1401 * /proc fs routines....
1404 static inline void line_info(struct seq_file *m, int line,
1405 struct serial_state *state)
1407 char stat_buf[30], control, status;
1408 unsigned long flags;
1410 seq_printf(m, "%d: uart:amiga_builtin", line);
1412 local_irq_save(flags);
1414 control = tty_port_initialized(&state->tport) ? state->MCR : status;
1415 local_irq_restore(flags);
1419 if(!(control & SER_RTS))
1420 strcat(stat_buf, "|RTS");
1421 if(!(status & SER_CTS))
1422 strcat(stat_buf, "|CTS");
1423 if(!(control & SER_DTR))
1424 strcat(stat_buf, "|DTR");
1425 if(!(status & SER_DSR))
1426 strcat(stat_buf, "|DSR");
1427 if(!(status & SER_DCD))
1428 strcat(stat_buf, "|CD");
1431 seq_printf(m, " baud:%d", state->baud_base / state->quot);
1433 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1435 if (state->icount.frame)
1436 seq_printf(m, " fe:%d", state->icount.frame);
1438 if (state->icount.parity)
1439 seq_printf(m, " pe:%d", state->icount.parity);
1441 if (state->icount.brk)
1442 seq_printf(m, " brk:%d", state->icount.brk);
1444 if (state->icount.overrun)
1445 seq_printf(m, " oe:%d", state->icount.overrun);
1448 * Last thing is the RS-232 status lines
1450 seq_printf(m, " %s\n", stat_buf+1);
1453 static int rs_proc_show(struct seq_file *m, void *v)
1455 seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
1456 line_info(m, 0, &rs_table[0]);
1461 * ---------------------------------------------------------------------
1462 * rs_init() and friends
1464 * rs_init() is called at boot-time to initialize the serial driver.
1465 * ---------------------------------------------------------------------
1469 * This routine prints out the appropriate serial driver version
1470 * number, and identifies which options were configured into this
1473 static void show_serial_version(void)
1475 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1479 static const struct tty_operations serial_ops = {
1483 .put_char = rs_put_char,
1484 .flush_chars = rs_flush_chars,
1485 .write_room = rs_write_room,
1486 .chars_in_buffer = rs_chars_in_buffer,
1487 .flush_buffer = rs_flush_buffer,
1489 .throttle = rs_throttle,
1490 .unthrottle = rs_unthrottle,
1491 .set_termios = rs_set_termios,
1494 .hangup = rs_hangup,
1495 .break_ctl = rs_break,
1496 .send_xchar = rs_send_xchar,
1497 .wait_until_sent = rs_wait_until_sent,
1498 .tiocmget = rs_tiocmget,
1499 .tiocmset = rs_tiocmset,
1500 .get_icount = rs_get_icount,
1501 .set_serial = set_serial_info,
1502 .get_serial = get_serial_info,
1503 .proc_show = rs_proc_show,
1506 static int amiga_carrier_raised(struct tty_port *port)
1508 return !(ciab.pra & SER_DCD);
1511 static void amiga_dtr_rts(struct tty_port *port, int raise)
1513 struct serial_state *info = container_of(port, struct serial_state,
1515 unsigned long flags;
1518 info->MCR |= SER_DTR|SER_RTS;
1520 info->MCR &= ~(SER_DTR|SER_RTS);
1522 local_irq_save(flags);
1523 rtsdtr_ctrl(info->MCR);
1524 local_irq_restore(flags);
1527 static const struct tty_port_operations amiga_port_ops = {
1528 .carrier_raised = amiga_carrier_raised,
1529 .dtr_rts = amiga_dtr_rts,
1533 * The serial driver boot-time initialization code!
1535 static int __init amiga_serial_probe(struct platform_device *pdev)
1537 unsigned long flags;
1538 struct serial_state * state;
1541 serial_driver = alloc_tty_driver(NR_PORTS);
1545 show_serial_version();
1547 /* Initialize the tty_driver structure */
1549 serial_driver->driver_name = "amiserial";
1550 serial_driver->name = "ttyS";
1551 serial_driver->major = TTY_MAJOR;
1552 serial_driver->minor_start = 64;
1553 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1554 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1555 serial_driver->init_termios = tty_std_termios;
1556 serial_driver->init_termios.c_cflag =
1557 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1558 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1559 tty_set_operations(serial_driver, &serial_ops);
1562 state->port = (int)&custom.serdatr; /* Just to give it a value */
1563 state->custom_divisor = 0;
1564 state->icount.cts = state->icount.dsr =
1565 state->icount.rng = state->icount.dcd = 0;
1566 state->icount.rx = state->icount.tx = 0;
1567 state->icount.frame = state->icount.parity = 0;
1568 state->icount.overrun = state->icount.brk = 0;
1569 tty_port_init(&state->tport);
1570 state->tport.ops = &amiga_port_ops;
1571 tty_port_link_device(&state->tport, serial_driver, 0);
1573 error = tty_register_driver(serial_driver);
1575 goto fail_put_tty_driver;
1577 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
1579 /* Hardware set up */
1581 state->baud_base = amiga_colorclock;
1582 state->xmit_fifo_size = 1;
1584 /* set ISRs, and then disable the rx interrupts */
1585 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
1587 goto fail_unregister;
1589 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
1590 "serial RX", state);
1594 local_irq_save(flags);
1596 /* turn off Rx and Tx interrupts */
1597 custom.intena = IF_RBF | IF_TBE;
1600 /* clear any pending interrupt */
1601 custom.intreq = IF_RBF | IF_TBE;
1604 local_irq_restore(flags);
1607 * set the appropriate directions for the modem control flags,
1608 * and clear RTS and DTR
1610 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
1611 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
1613 platform_set_drvdata(pdev, state);
1618 free_irq(IRQ_AMIGA_TBE, state);
1620 tty_unregister_driver(serial_driver);
1621 fail_put_tty_driver:
1622 tty_port_destroy(&state->tport);
1623 put_tty_driver(serial_driver);
1627 static int __exit amiga_serial_remove(struct platform_device *pdev)
1630 struct serial_state *state = platform_get_drvdata(pdev);
1632 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
1633 error = tty_unregister_driver(serial_driver);
1635 printk("SERIAL: failed to unregister serial driver (%d)\n",
1637 put_tty_driver(serial_driver);
1638 tty_port_destroy(&state->tport);
1640 free_irq(IRQ_AMIGA_TBE, state);
1641 free_irq(IRQ_AMIGA_RBF, state);
1646 static struct platform_driver amiga_serial_driver = {
1647 .remove = __exit_p(amiga_serial_remove),
1649 .name = "amiga-serial",
1653 module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe);
1656 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1659 * ------------------------------------------------------------
1660 * Serial console driver
1661 * ------------------------------------------------------------
1664 static void amiga_serial_putc(char c)
1666 custom.serdat = (unsigned char)c | 0x100;
1667 while (!(custom.serdatr & 0x2000))
1672 * Print a string to the serial port trying not to disturb
1673 * any possible real use of the port...
1675 * The console must be locked when we get here.
1677 static void serial_console_write(struct console *co, const char *s,
1680 unsigned short intena = custom.intenar;
1682 custom.intena = IF_TBE;
1686 amiga_serial_putc('\r');
1687 amiga_serial_putc(*s++);
1690 custom.intena = IF_SETCLR | (intena & IF_TBE);
1693 static struct tty_driver *serial_console_device(struct console *c, int *index)
1696 return serial_driver;
1699 static struct console sercons = {
1701 .write = serial_console_write,
1702 .device = serial_console_device,
1703 .flags = CON_PRINTBUFFER,
1710 static int __init amiserial_console_init(void)
1715 register_console(&sercons);
1718 console_initcall(amiserial_console_init);
1720 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1722 MODULE_LICENSE("GPL");
1723 MODULE_ALIAS("platform:amiga-serial");