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 /* Set of debugging defines */
27 #undef SERIAL_DEBUG_INTR
28 #undef SERIAL_DEBUG_OPEN
29 #undef SERIAL_DEBUG_FLOW
30 #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
33 * End of serial driver configuration section.
36 #include <linux/bitops.h>
37 #include <linux/circ_buf.h>
38 #include <linux/console.h>
39 #include <linux/delay.h>
40 #include <linux/errno.h>
41 #include <linux/fcntl.h>
42 #include <linux/init.h>
43 #include <linux/interrupt.h>
44 #include <linux/ioport.h>
45 #include <linux/kernel.h>
46 #include <linux/major.h>
48 #include <linux/module.h>
49 #include <linux/platform_device.h>
50 #include <linux/ptrace.h>
51 #include <linux/seq_file.h>
52 #include <linux/serial.h>
53 #include <linux/serial_reg.h>
54 #include <linux/sched.h>
55 #include <linux/signal.h>
56 #include <linux/slab.h>
57 #include <linux/string.h>
58 #include <linux/timer.h>
59 #include <linux/tty_flip.h>
60 #include <linux/tty.h>
61 #include <linux/types.h>
62 #include <linux/uaccess.h>
64 #include <asm/amigahw.h>
65 #include <asm/amigaints.h>
67 #include <asm/setup.h>
70 struct tty_port tport;
72 struct async_icount icount;
78 int ignore_status_mask;
81 int IER; /* Interrupt Enable Register */
82 int MCR; /* Modem control register */
83 int x_char; /* xon/xoff character */
86 static struct tty_driver *serial_driver;
88 /* number of characters left in xmit buffer before we ask for more */
89 #define WAKEUP_CHARS 256
91 #define XMIT_FIFO_SIZE 1
93 static unsigned char current_ctl_bits;
95 static void change_speed(struct tty_struct *tty, struct serial_state *info,
96 struct ktermios *old);
97 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
100 static struct serial_state serial_state;
102 /* some serial hardware definitions */
103 #define SDR_OVRUN (1<<15)
104 #define SDR_RBF (1<<14)
105 #define SDR_TBE (1<<13)
106 #define SDR_TSRE (1<<12)
108 #define SERPER_PARENB (1<<15)
110 #define AC_SETCLR (1<<15)
111 #define AC_UARTBRK (1<<11)
113 #define SER_DTR (1<<7)
114 #define SER_RTS (1<<6)
115 #define SER_DCD (1<<5)
116 #define SER_CTS (1<<4)
117 #define SER_DSR (1<<3)
119 static __inline__ void rtsdtr_ctrl(int bits)
121 ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
125 * ------------------------------------------------------------
126 * rs_stop() and rs_start()
128 * This routines are called before setting or resetting tty->flow.stopped.
129 * They enable or disable transmitter interrupts, as necessary.
130 * ------------------------------------------------------------
132 static void rs_stop(struct tty_struct *tty)
134 struct serial_state *info = tty->driver_data;
137 local_irq_save(flags);
138 if (info->IER & UART_IER_THRI) {
139 info->IER &= ~UART_IER_THRI;
140 /* disable Tx interrupt and remove any pending interrupts */
141 amiga_custom.intena = IF_TBE;
143 amiga_custom.intreq = IF_TBE;
146 local_irq_restore(flags);
149 static void rs_start(struct tty_struct *tty)
151 struct serial_state *info = tty->driver_data;
154 local_irq_save(flags);
155 if (info->xmit.head != info->xmit.tail
157 && !(info->IER & UART_IER_THRI)) {
158 info->IER |= UART_IER_THRI;
159 amiga_custom.intena = IF_SETCLR | IF_TBE;
161 /* set a pending Tx Interrupt, transmitter should restart now */
162 amiga_custom.intreq = IF_SETCLR | IF_TBE;
165 local_irq_restore(flags);
169 * ----------------------------------------------------------------------
171 * Here start the interrupt handling routines.
173 * -----------------------------------------------------------------------
176 static void receive_chars(struct serial_state *info)
180 unsigned char ch, flag;
181 struct async_icount *icount;
184 icount = &info->icount;
186 status = UART_LSR_DR; /* We obviously have a character! */
187 serdatr = amiga_custom.serdatr;
189 amiga_custom.intreq = IF_RBF;
192 if((serdatr & 0x1ff) == 0)
193 status |= UART_LSR_BI;
194 if(serdatr & SDR_OVRUN)
195 status |= UART_LSR_OE;
200 #ifdef SERIAL_DEBUG_INTR
201 printk("DR%02x:%02x...", ch, status);
206 * We don't handle parity or frame errors - but I have left
207 * the code in, since I'm not sure that the errors can't be
211 if (status & (UART_LSR_BI | UART_LSR_PE |
212 UART_LSR_FE | UART_LSR_OE)) {
214 * For statistics only
216 if (status & UART_LSR_BI) {
217 status &= ~(UART_LSR_FE | UART_LSR_PE);
219 } else if (status & UART_LSR_PE)
221 else if (status & UART_LSR_FE)
223 if (status & UART_LSR_OE)
227 * Now check to see if character should be
228 * ignored, and mask off conditions which
231 if (status & info->ignore_status_mask)
234 status &= info->read_status_mask;
236 if (status & (UART_LSR_BI)) {
237 #ifdef SERIAL_DEBUG_INTR
238 printk("handling break....");
241 if (info->tport.flags & ASYNC_SAK)
242 do_SAK(info->tport.tty);
243 } else if (status & UART_LSR_PE)
245 else if (status & UART_LSR_FE)
247 if (status & UART_LSR_OE) {
249 * Overrun is special, since it's
250 * reported immediately, and doesn't
251 * affect the current character
256 tty_insert_flip_char(&info->tport, ch, flag);
258 tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN);
259 tty_flip_buffer_push(&info->tport);
264 static void transmit_chars(struct serial_state *info)
266 amiga_custom.intreq = IF_TBE;
269 amiga_custom.serdat = info->x_char | 0x100;
275 if (info->xmit.head == info->xmit.tail
276 || info->tport.tty->flow.stopped
277 || info->tport.tty->hw_stopped) {
278 info->IER &= ~UART_IER_THRI;
279 amiga_custom.intena = IF_TBE;
284 amiga_custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
286 info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
289 if (CIRC_CNT(info->xmit.head,
291 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
292 tty_wakeup(info->tport.tty);
294 #ifdef SERIAL_DEBUG_INTR
297 if (info->xmit.head == info->xmit.tail) {
298 amiga_custom.intena = IF_TBE;
300 info->IER &= ~UART_IER_THRI;
304 static void check_modem_status(struct serial_state *info)
306 struct tty_port *port = &info->tport;
307 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
308 unsigned char dstatus;
309 struct async_icount *icount;
311 /* Determine bits that have changed */
312 dstatus = status ^ current_ctl_bits;
313 current_ctl_bits = status;
316 icount = &info->icount;
317 /* update input line counters */
318 if (dstatus & SER_DSR)
320 if (dstatus & SER_DCD) {
323 if (dstatus & SER_CTS)
325 wake_up_interruptible(&port->delta_msr_wait);
328 if (tty_port_check_carrier(port) && (dstatus & SER_DCD)) {
329 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
330 printk("ttyS%d CD now %s...", info->line,
331 (!(status & SER_DCD)) ? "on" : "off");
333 if (!(status & SER_DCD))
334 wake_up_interruptible(&port->open_wait);
336 #ifdef SERIAL_DEBUG_OPEN
337 printk("doing serial hangup...");
340 tty_hangup(port->tty);
343 if (tty_port_cts_enabled(port)) {
344 if (port->tty->hw_stopped) {
345 if (!(status & SER_CTS)) {
346 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
347 printk("CTS tx start...");
349 port->tty->hw_stopped = 0;
350 info->IER |= UART_IER_THRI;
351 amiga_custom.intena = IF_SETCLR | IF_TBE;
353 /* set a pending Tx Interrupt, transmitter should restart now */
354 amiga_custom.intreq = IF_SETCLR | IF_TBE;
356 tty_wakeup(port->tty);
360 if ((status & SER_CTS)) {
361 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
362 printk("CTS tx stop...");
364 port->tty->hw_stopped = 1;
365 info->IER &= ~UART_IER_THRI;
366 /* disable Tx interrupt and remove any pending interrupts */
367 amiga_custom.intena = IF_TBE;
369 amiga_custom.intreq = IF_TBE;
376 static irqreturn_t ser_vbl_int( int irq, void *data)
378 /* vbl is just a periodic interrupt we tie into to update modem status */
379 struct serial_state *info = data;
381 * TBD - is it better to unregister from this interrupt or to
382 * ignore it if MSI is clear ?
384 if(info->IER & UART_IER_MSI)
385 check_modem_status(info);
389 static irqreturn_t ser_rx_int(int irq, void *dev_id)
391 struct serial_state *info = dev_id;
393 #ifdef SERIAL_DEBUG_INTR
394 printk("ser_rx_int...");
397 if (!info->tport.tty)
401 #ifdef SERIAL_DEBUG_INTR
407 static irqreturn_t ser_tx_int(int irq, void *dev_id)
409 struct serial_state *info = dev_id;
411 if (amiga_custom.serdatr & SDR_TBE) {
412 #ifdef SERIAL_DEBUG_INTR
413 printk("ser_tx_int...");
416 if (!info->tport.tty)
419 transmit_chars(info);
420 #ifdef SERIAL_DEBUG_INTR
428 * -------------------------------------------------------------------
429 * Here ends the serial interrupt routines.
430 * -------------------------------------------------------------------
434 * ---------------------------------------------------------------
435 * Low level utility subroutines for the serial driver: routines to
436 * figure out the appropriate timeout for an interrupt chain, routines
437 * to initialize and startup a serial port, and routines to shutdown a
438 * serial port. Useful stuff like that.
439 * ---------------------------------------------------------------
442 static int startup(struct tty_struct *tty, struct serial_state *info)
444 struct tty_port *port = &info->tport;
449 page = get_zeroed_page(GFP_KERNEL);
453 local_irq_save(flags);
455 if (tty_port_initialized(port)) {
463 info->xmit.buf = (unsigned char *) page;
465 #ifdef SERIAL_DEBUG_OPEN
466 printk("starting up ttys%d ...", info->line);
469 /* Clear anything in the input buffer */
471 amiga_custom.intreq = IF_RBF;
474 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
476 if (capable(CAP_SYS_ADMIN)) {
477 set_bit(TTY_IO_ERROR, &tty->flags);
483 /* enable both Rx and Tx interrupts */
484 amiga_custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
486 info->IER = UART_IER_MSI;
488 /* remember current state of the DCD and CTS bits */
489 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
493 info->MCR = SER_DTR | SER_RTS;
494 rtsdtr_ctrl(info->MCR);
496 clear_bit(TTY_IO_ERROR, &tty->flags);
497 info->xmit.head = info->xmit.tail = 0;
500 * and set the speed of the serial port
502 change_speed(tty, info, NULL);
504 tty_port_set_initialized(port, 1);
505 local_irq_restore(flags);
509 local_irq_restore(flags);
514 * This routine will shutdown a serial port; interrupts are disabled, and
515 * DTR is dropped if the hangup on close termio flag is on.
517 static void shutdown(struct tty_struct *tty, struct serial_state *info)
521 if (!tty_port_initialized(&info->tport))
524 #ifdef SERIAL_DEBUG_OPEN
525 printk("Shutting down serial port %d ....\n", info->line);
528 local_irq_save(flags); /* Disable interrupts */
531 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
532 * here so the queue might never be waken up
534 wake_up_interruptible(&info->tport.delta_msr_wait);
537 * Free the IRQ, if necessary
539 free_irq(IRQ_AMIGA_VERTB, info);
541 if (info->xmit.buf) {
542 free_page((unsigned long) info->xmit.buf);
543 info->xmit.buf = NULL;
547 amiga_custom.intena = IF_RBF | IF_TBE;
550 /* disable break condition */
551 amiga_custom.adkcon = AC_UARTBRK;
555 info->MCR &= ~(SER_DTR|SER_RTS);
556 rtsdtr_ctrl(info->MCR);
558 set_bit(TTY_IO_ERROR, &tty->flags);
560 tty_port_set_initialized(&info->tport, 0);
561 local_irq_restore(flags);
566 * This routine is called to set the UART divisor registers to match
567 * the specified baud rate for a serial port.
569 static void change_speed(struct tty_struct *tty, struct serial_state *info,
570 struct ktermios *old_termios)
572 struct tty_port *port = &info->tport;
573 int quot = 0, baud_base, baud;
574 unsigned cflag, cval = 0;
578 cflag = tty->termios.c_cflag;
580 /* Byte size is always 8 bits plus parity bit if requested */
583 if (cflag & CSTOPB) {
587 if (cflag & PARENB) {
588 cval |= UART_LCR_PARITY;
591 if (!(cflag & PARODD))
592 cval |= UART_LCR_EPAR;
595 cval |= UART_LCR_SPAR;
598 /* Determine divisor based on baud rate */
599 baud = tty_get_baud_rate(tty);
601 baud = 9600; /* B0 transition handled in rs_set_termios */
602 baud_base = info->baud_base;
603 if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
604 quot = info->custom_divisor;
607 /* Special case since 134 is really 134.5 */
608 quot = (2*baud_base / 269);
610 quot = baud_base / baud;
612 /* If the quotient is zero refuse the change */
613 if (!quot && old_termios) {
614 /* FIXME: Will need updating for new tty in the end */
615 tty->termios.c_cflag &= ~CBAUD;
616 tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD);
617 baud = tty_get_baud_rate(tty);
621 (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
622 quot = info->custom_divisor;
625 /* Special case since 134 is really 134.5 */
626 quot = (2*baud_base / 269);
628 quot = baud_base / baud;
631 /* As a last resort, if the quotient is zero, default to 9600 bps */
633 quot = baud_base / 9600;
635 info->timeout = (XMIT_FIFO_SIZE*HZ*bits*quot) / baud_base;
636 info->timeout += HZ/50; /* Add .02 seconds of slop */
638 /* CTS flow control flag and modem status interrupts */
639 info->IER &= ~UART_IER_MSI;
640 if (port->flags & ASYNC_HARDPPS_CD)
641 info->IER |= UART_IER_MSI;
642 tty_port_set_cts_flow(port, cflag & CRTSCTS);
644 info->IER |= UART_IER_MSI;
645 tty_port_set_check_carrier(port, ~cflag & CLOCAL);
647 info->IER |= UART_IER_MSI;
649 * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
653 * Set up parity check flag
656 info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
658 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
659 if (I_BRKINT(tty) || I_PARMRK(tty))
660 info->read_status_mask |= UART_LSR_BI;
663 * Characters to ignore
665 info->ignore_status_mask = 0;
667 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
669 info->ignore_status_mask |= UART_LSR_BI;
671 * If we're ignore parity and break indicators, ignore
672 * overruns too. (For real raw support).
675 info->ignore_status_mask |= UART_LSR_OE;
678 * !!! ignore all characters if CREAD is not set
680 if ((cflag & CREAD) == 0)
681 info->ignore_status_mask |= UART_LSR_DR;
682 local_irq_save(flags);
687 /* Set up the baud rate */
690 /* Enable or disable parity bit */
692 if(cval & UART_LCR_PARITY)
693 serper |= (SERPER_PARENB);
695 amiga_custom.serper = serper;
699 local_irq_restore(flags);
702 static int rs_put_char(struct tty_struct *tty, unsigned char ch)
704 struct serial_state *info;
707 info = tty->driver_data;
712 local_irq_save(flags);
713 if (CIRC_SPACE(info->xmit.head,
715 SERIAL_XMIT_SIZE) == 0) {
716 local_irq_restore(flags);
720 info->xmit.buf[info->xmit.head++] = ch;
721 info->xmit.head &= SERIAL_XMIT_SIZE-1;
722 local_irq_restore(flags);
726 static void rs_flush_chars(struct tty_struct *tty)
728 struct serial_state *info = tty->driver_data;
731 if (info->xmit.head == info->xmit.tail
737 local_irq_save(flags);
738 info->IER |= UART_IER_THRI;
739 amiga_custom.intena = IF_SETCLR | IF_TBE;
741 /* set a pending Tx Interrupt, transmitter should restart now */
742 amiga_custom.intreq = IF_SETCLR | IF_TBE;
744 local_irq_restore(flags);
747 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
750 struct serial_state *info = tty->driver_data;
756 local_irq_save(flags);
758 c = CIRC_SPACE_TO_END(info->xmit.head,
766 memcpy(info->xmit.buf + info->xmit.head, buf, c);
767 info->xmit.head = ((info->xmit.head + c) &
768 (SERIAL_XMIT_SIZE-1));
773 local_irq_restore(flags);
775 if (info->xmit.head != info->xmit.tail
776 && !tty->flow.stopped
778 && !(info->IER & UART_IER_THRI)) {
779 info->IER |= UART_IER_THRI;
781 amiga_custom.intena = IF_SETCLR | IF_TBE;
783 /* set a pending Tx Interrupt, transmitter should restart now */
784 amiga_custom.intreq = IF_SETCLR | IF_TBE;
786 local_irq_restore(flags);
791 static unsigned int rs_write_room(struct tty_struct *tty)
793 struct serial_state *info = tty->driver_data;
795 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
798 static unsigned int rs_chars_in_buffer(struct tty_struct *tty)
800 struct serial_state *info = tty->driver_data;
802 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
805 static void rs_flush_buffer(struct tty_struct *tty)
807 struct serial_state *info = tty->driver_data;
810 local_irq_save(flags);
811 info->xmit.head = info->xmit.tail = 0;
812 local_irq_restore(flags);
817 * This function is used to send a high-priority XON/XOFF character to
820 static void rs_send_xchar(struct tty_struct *tty, char ch)
822 struct serial_state *info = tty->driver_data;
827 /* Make sure transmit interrupts are on */
830 local_irq_save(flags);
831 if(!(amiga_custom.intenar & IF_TBE)) {
832 amiga_custom.intena = IF_SETCLR | IF_TBE;
834 /* set a pending Tx Interrupt, transmitter should restart now */
835 amiga_custom.intreq = IF_SETCLR | IF_TBE;
838 local_irq_restore(flags);
840 info->IER |= UART_IER_THRI;
845 * ------------------------------------------------------------
848 * This routine is called by the upper-layer tty layer to signal that
849 * incoming characters should be throttled.
850 * ------------------------------------------------------------
852 static void rs_throttle(struct tty_struct * tty)
854 struct serial_state *info = tty->driver_data;
856 #ifdef SERIAL_DEBUG_THROTTLE
857 printk("throttle %s ....\n", tty_name(tty));
861 rs_send_xchar(tty, STOP_CHAR(tty));
864 info->MCR &= ~SER_RTS;
866 local_irq_save(flags);
867 rtsdtr_ctrl(info->MCR);
868 local_irq_restore(flags);
871 static void rs_unthrottle(struct tty_struct * tty)
873 struct serial_state *info = tty->driver_data;
875 #ifdef SERIAL_DEBUG_THROTTLE
876 printk("unthrottle %s ....\n", tty_name(tty));
883 rs_send_xchar(tty, START_CHAR(tty));
886 info->MCR |= SER_RTS;
887 local_irq_save(flags);
888 rtsdtr_ctrl(info->MCR);
889 local_irq_restore(flags);
893 * ------------------------------------------------------------
894 * rs_ioctl() and friends
895 * ------------------------------------------------------------
898 static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
900 struct serial_state *state = tty->driver_data;
901 unsigned int close_delay, closing_wait;
904 close_delay = jiffies_to_msecs(state->tport.close_delay) / 10;
905 closing_wait = state->tport.closing_wait;
906 if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
907 closing_wait = jiffies_to_msecs(closing_wait) / 10;
909 ss->line = tty->index;
910 ss->port = state->port;
911 ss->flags = state->tport.flags;
912 ss->xmit_fifo_size = XMIT_FIFO_SIZE;
913 ss->baud_base = state->baud_base;
914 ss->close_delay = close_delay;
915 ss->closing_wait = closing_wait;
916 ss->custom_divisor = state->custom_divisor;
921 static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
923 struct serial_state *state = tty->driver_data;
924 struct tty_port *port = &state->tport;
927 unsigned int close_delay, closing_wait;
930 change_spd = ((ss->flags ^ port->flags) & ASYNC_SPD_MASK) ||
931 ss->custom_divisor != state->custom_divisor;
932 if (ss->irq || ss->port != state->port ||
933 ss->xmit_fifo_size != XMIT_FIFO_SIZE) {
938 close_delay = msecs_to_jiffies(ss->close_delay * 10);
939 closing_wait = ss->closing_wait;
940 if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
941 closing_wait = msecs_to_jiffies(closing_wait * 10);
943 if (!capable(CAP_SYS_ADMIN)) {
944 if ((ss->baud_base != state->baud_base) ||
945 (close_delay != port->close_delay) ||
946 (closing_wait != port->closing_wait) ||
947 ((ss->flags & ~ASYNC_USR_MASK) !=
948 (port->flags & ~ASYNC_USR_MASK))) {
952 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
953 (ss->flags & ASYNC_USR_MASK));
954 state->custom_divisor = ss->custom_divisor;
958 if (ss->baud_base < 9600) {
964 * OK, past this point, all the error checking has been done.
965 * At this point, we start making changes.....
968 state->baud_base = ss->baud_base;
969 port->flags = ((port->flags & ~ASYNC_FLAGS) |
970 (ss->flags & ASYNC_FLAGS));
971 state->custom_divisor = ss->custom_divisor;
972 port->close_delay = close_delay;
973 port->closing_wait = closing_wait;
976 if (tty_port_initialized(port)) {
978 /* warn about deprecation unless clearing */
979 if (ss->flags & ASYNC_SPD_MASK)
980 dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n");
981 change_speed(tty, state, NULL);
984 retval = startup(tty, state);
990 * get_lsr_info - get line status register info
992 * Purpose: Let user call ioctl() to get info when the UART physically
993 * is emptied. On bus types like RS485, the transmitter must
994 * release the bus after transmitting. This must be done when
995 * the transmit shift register is empty, not be done when the
996 * transmit holding register is empty. This functionality
997 * allows an RS485 driver to be written in user space.
999 static int get_lsr_info(struct serial_state *info, unsigned int __user *value)
1001 unsigned char status;
1002 unsigned int result;
1003 unsigned long flags;
1005 local_irq_save(flags);
1006 status = amiga_custom.serdatr;
1008 local_irq_restore(flags);
1009 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1010 if (copy_to_user(value, &result, sizeof(int)))
1016 static int rs_tiocmget(struct tty_struct *tty)
1018 struct serial_state *info = tty->driver_data;
1019 unsigned char control, status;
1020 unsigned long flags;
1022 if (tty_io_error(tty))
1025 control = info->MCR;
1026 local_irq_save(flags);
1028 local_irq_restore(flags);
1029 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1030 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1031 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1032 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1033 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1036 static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
1039 struct serial_state *info = tty->driver_data;
1040 unsigned long flags;
1042 if (tty_io_error(tty))
1045 local_irq_save(flags);
1046 if (set & TIOCM_RTS)
1047 info->MCR |= SER_RTS;
1048 if (set & TIOCM_DTR)
1049 info->MCR |= SER_DTR;
1050 if (clear & TIOCM_RTS)
1051 info->MCR &= ~SER_RTS;
1052 if (clear & TIOCM_DTR)
1053 info->MCR &= ~SER_DTR;
1054 rtsdtr_ctrl(info->MCR);
1055 local_irq_restore(flags);
1060 * rs_break() --- routine which turns the break handling on or off
1062 static int rs_break(struct tty_struct *tty, int break_state)
1064 unsigned long flags;
1066 local_irq_save(flags);
1067 if (break_state == -1)
1068 amiga_custom.adkcon = AC_SETCLR | AC_UARTBRK;
1070 amiga_custom.adkcon = AC_UARTBRK;
1072 local_irq_restore(flags);
1077 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1078 * Return: write counters to the user passed counter struct
1079 * NB: both 1->0 and 0->1 transitions are counted except for
1080 * RI where only 0->1 is counted.
1082 static int rs_get_icount(struct tty_struct *tty,
1083 struct serial_icounter_struct *icount)
1085 struct serial_state *info = tty->driver_data;
1086 struct async_icount cnow;
1087 unsigned long flags;
1089 local_irq_save(flags);
1090 cnow = info->icount;
1091 local_irq_restore(flags);
1092 icount->cts = cnow.cts;
1093 icount->dsr = cnow.dsr;
1094 icount->rng = cnow.rng;
1095 icount->dcd = cnow.dcd;
1096 icount->rx = cnow.rx;
1097 icount->tx = cnow.tx;
1098 icount->frame = cnow.frame;
1099 icount->overrun = cnow.overrun;
1100 icount->parity = cnow.parity;
1101 icount->brk = cnow.brk;
1102 icount->buf_overrun = cnow.buf_overrun;
1107 static int rs_ioctl(struct tty_struct *tty,
1108 unsigned int cmd, unsigned long arg)
1110 struct serial_state *info = tty->driver_data;
1111 struct async_icount cprev, cnow; /* kernel counter temps */
1112 void __user *argp = (void __user *)arg;
1113 unsigned long flags;
1117 if ((cmd != TIOCSERCONFIG) &&
1118 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1119 if (tty_io_error(tty))
1127 case TIOCSERGETLSR: /* Get line status register */
1128 return get_lsr_info(info, argp);
1131 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1132 * - mask passed in arg for lines of interest
1133 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1134 * Caller should use TIOCGICOUNT to see which one it was
1137 local_irq_save(flags);
1138 /* note the counters on entry */
1139 cprev = info->icount;
1140 local_irq_restore(flags);
1142 prepare_to_wait(&info->tport.delta_msr_wait,
1143 &wait, TASK_INTERRUPTIBLE);
1144 local_irq_save(flags);
1145 cnow = info->icount; /* atomic copy */
1146 local_irq_restore(flags);
1147 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1148 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
1149 ret = -EIO; /* no change => error */
1152 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1153 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1154 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1155 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1160 /* see if a signal did it */
1161 if (signal_pending(current)) {
1167 finish_wait(&info->tport.delta_msr_wait, &wait);
1171 return -ENOIOCTLCMD;
1176 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1178 struct serial_state *info = tty->driver_data;
1179 unsigned long flags;
1180 unsigned int cflag = tty->termios.c_cflag;
1182 change_speed(tty, info, old_termios);
1184 /* Handle transition to B0 status */
1185 if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) {
1186 info->MCR &= ~(SER_DTR|SER_RTS);
1187 local_irq_save(flags);
1188 rtsdtr_ctrl(info->MCR);
1189 local_irq_restore(flags);
1192 /* Handle transition away from B0 status */
1193 if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
1194 info->MCR |= SER_DTR;
1195 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
1196 info->MCR |= SER_RTS;
1197 local_irq_save(flags);
1198 rtsdtr_ctrl(info->MCR);
1199 local_irq_restore(flags);
1202 /* Handle turning off CRTSCTS */
1203 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1204 tty->hw_stopped = 0;
1210 * No need to wake up processes in open wait, since they
1211 * sample the CLOCAL flag once, and don't recheck it.
1212 * XXX It's not clear whether the current behavior is correct
1213 * or not. Hence, this may change.....
1215 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1216 wake_up_interruptible(&info->open_wait);
1221 * ------------------------------------------------------------
1224 * This routine is called when the serial port gets closed. First, we
1225 * wait for the last remaining data to be sent. Then, we unlink its
1226 * async structure from the interrupt chain if necessary, and we free
1227 * that IRQ if nothing is left in the chain.
1228 * ------------------------------------------------------------
1230 static void rs_close(struct tty_struct *tty, struct file * filp)
1232 struct serial_state *state = tty->driver_data;
1233 struct tty_port *port = &state->tport;
1235 if (tty_port_close_start(port, tty, filp) == 0)
1239 * At this point we stop accepting input. To do this, we
1240 * disable the receive line status interrupts, and tell the
1241 * interrupt driver to stop checking the data ready bit in the
1242 * line status register.
1244 state->read_status_mask &= ~UART_LSR_DR;
1245 if (tty_port_initialized(port)) {
1246 /* disable receive interrupts */
1247 amiga_custom.intena = IF_RBF;
1249 /* clear any pending receive interrupt */
1250 amiga_custom.intreq = IF_RBF;
1254 * Before we drop DTR, make sure the UART transmitter
1255 * has completely drained; this is especially
1256 * important if there is a transmit FIFO!
1258 rs_wait_until_sent(tty, state->timeout);
1260 shutdown(tty, state);
1261 rs_flush_buffer(tty);
1263 tty_ldisc_flush(tty);
1266 tty_port_close_end(port, tty);
1270 * rs_wait_until_sent() --- wait until the transmitter is empty
1272 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1274 struct serial_state *info = tty->driver_data;
1275 unsigned long orig_jiffies, char_time;
1278 orig_jiffies = jiffies;
1281 * Set the check interval to be 1/5 of the estimated time to
1282 * send a single character, and make it at least 1. The check
1283 * interval should also be less than the timeout.
1285 * Note: we have to use pretty tight timings here to satisfy
1288 char_time = (info->timeout - HZ/50) / XMIT_FIFO_SIZE;
1289 char_time = char_time / 5;
1293 char_time = min_t(unsigned long, char_time, timeout);
1295 * If the transmitter hasn't cleared in twice the approximate
1296 * amount of time to send the entire FIFO, it probably won't
1297 * ever clear. This assumes the UART isn't doing flow
1298 * control, which is currently the case. Hence, if it ever
1299 * takes longer than info->timeout, this is probably due to a
1300 * UART bug of some kind. So, we clamp the timeout parameter at
1303 if (!timeout || timeout > 2*info->timeout)
1304 timeout = 2*info->timeout;
1305 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1306 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1307 printk("jiff=%lu...", jiffies);
1309 while(!((lsr = amiga_custom.serdatr) & SDR_TSRE)) {
1310 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1311 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1313 msleep_interruptible(jiffies_to_msecs(char_time));
1314 if (signal_pending(current))
1316 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1319 __set_current_state(TASK_RUNNING);
1321 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1322 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1327 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1329 static void rs_hangup(struct tty_struct *tty)
1331 struct serial_state *info = tty->driver_data;
1333 rs_flush_buffer(tty);
1334 shutdown(tty, info);
1335 info->tport.count = 0;
1336 tty_port_set_active(&info->tport, 0);
1337 info->tport.tty = NULL;
1338 wake_up_interruptible(&info->tport.open_wait);
1342 * This routine is called whenever a serial port is opened. It
1343 * enables interrupts for a serial port, linking in its async structure into
1344 * the IRQ chain. It also performs the serial-specific
1345 * initialization for the tty structure.
1347 static int rs_open(struct tty_struct *tty, struct file * filp)
1349 struct tty_port *port = tty->port;
1350 struct serial_state *info = container_of(port, struct serial_state,
1356 tty->driver_data = info;
1358 retval = startup(tty, info);
1363 return tty_port_block_til_ready(port, tty, filp);
1367 * /proc fs routines....
1370 static inline void line_info(struct seq_file *m, int line,
1371 struct serial_state *state)
1373 char stat_buf[30], control, status;
1374 unsigned long flags;
1376 seq_printf(m, "%d: uart:amiga_builtin", line);
1378 local_irq_save(flags);
1380 control = tty_port_initialized(&state->tport) ? state->MCR : status;
1381 local_irq_restore(flags);
1385 if(!(control & SER_RTS))
1386 strcat(stat_buf, "|RTS");
1387 if(!(status & SER_CTS))
1388 strcat(stat_buf, "|CTS");
1389 if(!(control & SER_DTR))
1390 strcat(stat_buf, "|DTR");
1391 if(!(status & SER_DSR))
1392 strcat(stat_buf, "|DSR");
1393 if(!(status & SER_DCD))
1394 strcat(stat_buf, "|CD");
1397 seq_printf(m, " baud:%d", state->baud_base / state->quot);
1399 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1401 if (state->icount.frame)
1402 seq_printf(m, " fe:%d", state->icount.frame);
1404 if (state->icount.parity)
1405 seq_printf(m, " pe:%d", state->icount.parity);
1407 if (state->icount.brk)
1408 seq_printf(m, " brk:%d", state->icount.brk);
1410 if (state->icount.overrun)
1411 seq_printf(m, " oe:%d", state->icount.overrun);
1414 * Last thing is the RS-232 status lines
1416 seq_printf(m, " %s\n", stat_buf+1);
1419 static int rs_proc_show(struct seq_file *m, void *v)
1421 seq_printf(m, "serinfo:1.0 driver:4.30\n");
1422 line_info(m, 0, &serial_state);
1427 * ---------------------------------------------------------------------
1428 * rs_init() and friends
1430 * rs_init() is called at boot-time to initialize the serial driver.
1431 * ---------------------------------------------------------------------
1434 static const struct tty_operations serial_ops = {
1438 .put_char = rs_put_char,
1439 .flush_chars = rs_flush_chars,
1440 .write_room = rs_write_room,
1441 .chars_in_buffer = rs_chars_in_buffer,
1442 .flush_buffer = rs_flush_buffer,
1444 .throttle = rs_throttle,
1445 .unthrottle = rs_unthrottle,
1446 .set_termios = rs_set_termios,
1449 .hangup = rs_hangup,
1450 .break_ctl = rs_break,
1451 .send_xchar = rs_send_xchar,
1452 .wait_until_sent = rs_wait_until_sent,
1453 .tiocmget = rs_tiocmget,
1454 .tiocmset = rs_tiocmset,
1455 .get_icount = rs_get_icount,
1456 .set_serial = set_serial_info,
1457 .get_serial = get_serial_info,
1458 .proc_show = rs_proc_show,
1461 static int amiga_carrier_raised(struct tty_port *port)
1463 return !(ciab.pra & SER_DCD);
1466 static void amiga_dtr_rts(struct tty_port *port, int raise)
1468 struct serial_state *info = container_of(port, struct serial_state,
1470 unsigned long flags;
1473 info->MCR |= SER_DTR|SER_RTS;
1475 info->MCR &= ~(SER_DTR|SER_RTS);
1477 local_irq_save(flags);
1478 rtsdtr_ctrl(info->MCR);
1479 local_irq_restore(flags);
1482 static const struct tty_port_operations amiga_port_ops = {
1483 .carrier_raised = amiga_carrier_raised,
1484 .dtr_rts = amiga_dtr_rts,
1488 * The serial driver boot-time initialization code!
1490 static int __init amiga_serial_probe(struct platform_device *pdev)
1492 struct serial_state *state = &serial_state;
1493 struct tty_driver *driver;
1494 unsigned long flags;
1497 driver = tty_alloc_driver(1, TTY_DRIVER_REAL_RAW);
1499 return PTR_ERR(driver);
1501 /* Initialize the tty_driver structure */
1503 driver->driver_name = "amiserial";
1504 driver->name = "ttyS";
1505 driver->major = TTY_MAJOR;
1506 driver->minor_start = 64;
1507 driver->type = TTY_DRIVER_TYPE_SERIAL;
1508 driver->subtype = SERIAL_TYPE_NORMAL;
1509 driver->init_termios = tty_std_termios;
1510 driver->init_termios.c_cflag =
1511 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1512 tty_set_operations(driver, &serial_ops);
1514 memset(state, 0, sizeof(*state));
1515 state->port = (int)&amiga_custom.serdatr; /* Just to give it a value */
1516 tty_port_init(&state->tport);
1517 state->tport.ops = &amiga_port_ops;
1518 tty_port_link_device(&state->tport, driver, 0);
1520 error = tty_register_driver(driver);
1522 goto fail_tty_driver_kref_put;
1524 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
1526 /* Hardware set up */
1528 state->baud_base = amiga_colorclock;
1530 /* set ISRs, and then disable the rx interrupts */
1531 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
1533 goto fail_unregister;
1535 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
1536 "serial RX", state);
1540 local_irq_save(flags);
1542 /* turn off Rx and Tx interrupts */
1543 amiga_custom.intena = IF_RBF | IF_TBE;
1546 /* clear any pending interrupt */
1547 amiga_custom.intreq = IF_RBF | IF_TBE;
1550 local_irq_restore(flags);
1553 * set the appropriate directions for the modem control flags,
1554 * and clear RTS and DTR
1556 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
1557 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
1559 platform_set_drvdata(pdev, state);
1561 serial_driver = driver;
1566 free_irq(IRQ_AMIGA_TBE, state);
1568 tty_unregister_driver(driver);
1569 fail_tty_driver_kref_put:
1570 tty_port_destroy(&state->tport);
1571 tty_driver_kref_put(driver);
1575 static int __exit amiga_serial_remove(struct platform_device *pdev)
1577 struct serial_state *state = platform_get_drvdata(pdev);
1579 tty_unregister_driver(serial_driver);
1580 tty_driver_kref_put(serial_driver);
1581 tty_port_destroy(&state->tport);
1583 free_irq(IRQ_AMIGA_TBE, state);
1584 free_irq(IRQ_AMIGA_RBF, state);
1589 static struct platform_driver amiga_serial_driver = {
1590 .remove = __exit_p(amiga_serial_remove),
1592 .name = "amiga-serial",
1596 module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe);
1599 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1602 * ------------------------------------------------------------
1603 * Serial console driver
1604 * ------------------------------------------------------------
1607 static void amiga_serial_putc(char c)
1609 amiga_custom.serdat = (unsigned char)c | 0x100;
1610 while (!(amiga_custom.serdatr & 0x2000))
1615 * Print a string to the serial port trying not to disturb
1616 * any possible real use of the port...
1618 * The console must be locked when we get here.
1620 static void serial_console_write(struct console *co, const char *s,
1623 unsigned short intena = amiga_custom.intenar;
1625 amiga_custom.intena = IF_TBE;
1629 amiga_serial_putc('\r');
1630 amiga_serial_putc(*s++);
1633 amiga_custom.intena = IF_SETCLR | (intena & IF_TBE);
1636 static struct tty_driver *serial_console_device(struct console *c, int *index)
1639 return serial_driver;
1642 static struct console sercons = {
1644 .write = serial_console_write,
1645 .device = serial_console_device,
1646 .flags = CON_PRINTBUFFER,
1653 static int __init amiserial_console_init(void)
1658 register_console(&sercons);
1661 console_initcall(amiserial_console_init);
1663 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1665 MODULE_LICENSE("GPL");
1666 MODULE_ALIAS("platform:amiga-serial");