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
26 * Serial driver configuration section. Here are the various options:
28 * SERIAL_PARANOIA_CHECK
29 * Check the magic number for the async_structure where
33 #include <linux/delay.h>
35 #undef SERIAL_PARANOIA_CHECK
37 /* Set of debugging defines */
39 #undef SERIAL_DEBUG_INTR
40 #undef SERIAL_DEBUG_OPEN
41 #undef SERIAL_DEBUG_FLOW
42 #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
46 #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
47 #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
48 tty->name, (info->tport.flags), serial_driver->refcount,info->count,tty->count,s)
54 * End of serial driver configuration section.
57 #include <linux/module.h>
59 #include <linux/types.h>
60 #include <linux/serial.h>
61 #include <linux/serial_reg.h>
62 static char *serial_version = "4.30";
64 #include <linux/errno.h>
65 #include <linux/signal.h>
66 #include <linux/sched.h>
67 #include <linux/kernel.h>
68 #include <linux/timer.h>
69 #include <linux/interrupt.h>
70 #include <linux/tty.h>
71 #include <linux/tty_flip.h>
72 #include <linux/circ_buf.h>
73 #include <linux/console.h>
74 #include <linux/major.h>
75 #include <linux/string.h>
76 #include <linux/fcntl.h>
77 #include <linux/ptrace.h>
78 #include <linux/ioport.h>
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>
91 #include <asm/amigahw.h>
92 #include <asm/amigaints.h>
95 struct tty_port tport;
97 struct async_icount icount;
103 int read_status_mask;
104 int ignore_status_mask;
107 int IER; /* Interrupt Enable Register */
108 int MCR; /* Modem control register */
109 int x_char; /* xon/xoff character */
112 #define custom amiga_custom
113 static char *serial_name = "Amiga-builtin serial driver";
115 static struct tty_driver *serial_driver;
117 /* number of characters left in xmit buffer before we ask for more */
118 #define WAKEUP_CHARS 256
120 static unsigned char current_ctl_bits;
122 static void change_speed(struct tty_struct *tty, struct serial_state *info,
123 struct ktermios *old);
124 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
127 static struct serial_state rs_table[1];
129 #define NR_PORTS ARRAY_SIZE(rs_table)
131 #include <linux/uaccess.h>
133 #define serial_isroot() (capable(CAP_SYS_ADMIN))
136 static inline int serial_paranoia_check(struct serial_state *info,
137 char *name, const char *routine)
139 #ifdef SERIAL_PARANOIA_CHECK
140 static const char *badmagic =
141 "Warning: bad magic number for serial struct (%s) in %s\n";
142 static const char *badinfo =
143 "Warning: null async_struct for (%s) in %s\n";
146 printk(badinfo, name, routine);
149 if (info->magic != SERIAL_MAGIC) {
150 printk(badmagic, name, routine);
157 /* some serial hardware definitions */
158 #define SDR_OVRUN (1<<15)
159 #define SDR_RBF (1<<14)
160 #define SDR_TBE (1<<13)
161 #define SDR_TSRE (1<<12)
163 #define SERPER_PARENB (1<<15)
165 #define AC_SETCLR (1<<15)
166 #define AC_UARTBRK (1<<11)
168 #define SER_DTR (1<<7)
169 #define SER_RTS (1<<6)
170 #define SER_DCD (1<<5)
171 #define SER_CTS (1<<4)
172 #define SER_DSR (1<<3)
174 static __inline__ void rtsdtr_ctrl(int bits)
176 ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
180 * ------------------------------------------------------------
181 * rs_stop() and rs_start()
183 * This routines are called before setting or resetting tty->stopped.
184 * They enable or disable transmitter interrupts, as necessary.
185 * ------------------------------------------------------------
187 static void rs_stop(struct tty_struct *tty)
189 struct serial_state *info = tty->driver_data;
192 if (serial_paranoia_check(info, tty->name, "rs_stop"))
195 local_irq_save(flags);
196 if (info->IER & UART_IER_THRI) {
197 info->IER &= ~UART_IER_THRI;
198 /* disable Tx interrupt and remove any pending interrupts */
199 custom.intena = IF_TBE;
201 custom.intreq = IF_TBE;
204 local_irq_restore(flags);
207 static void rs_start(struct tty_struct *tty)
209 struct serial_state *info = tty->driver_data;
212 if (serial_paranoia_check(info, tty->name, "rs_start"))
215 local_irq_save(flags);
216 if (info->xmit.head != info->xmit.tail
218 && !(info->IER & UART_IER_THRI)) {
219 info->IER |= UART_IER_THRI;
220 custom.intena = IF_SETCLR | IF_TBE;
222 /* set a pending Tx Interrupt, transmitter should restart now */
223 custom.intreq = IF_SETCLR | IF_TBE;
226 local_irq_restore(flags);
230 * ----------------------------------------------------------------------
232 * Here starts the interrupt handling routines. All of the following
233 * subroutines are declared as inline and are folded into
234 * rs_interrupt(). They were separated out for readability's sake.
236 * Note: rs_interrupt() is a "fast" interrupt, which means that it
237 * runs with interrupts turned off. People who may want to modify
238 * rs_interrupt() should try to keep the interrupt handler as fast as
239 * possible. After you are done making modifications, it is not a bad
242 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
244 * and look at the resulting assemble code in serial.s.
246 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
247 * -----------------------------------------------------------------------
250 static void receive_chars(struct serial_state *info)
254 unsigned char ch, flag;
255 struct async_icount *icount;
258 icount = &info->icount;
260 status = UART_LSR_DR; /* We obviously have a character! */
261 serdatr = custom.serdatr;
263 custom.intreq = IF_RBF;
266 if((serdatr & 0x1ff) == 0)
267 status |= UART_LSR_BI;
268 if(serdatr & SDR_OVRUN)
269 status |= UART_LSR_OE;
274 #ifdef SERIAL_DEBUG_INTR
275 printk("DR%02x:%02x...", ch, status);
280 * We don't handle parity or frame errors - but I have left
281 * the code in, since I'm not sure that the errors can't be
285 if (status & (UART_LSR_BI | UART_LSR_PE |
286 UART_LSR_FE | UART_LSR_OE)) {
288 * For statistics only
290 if (status & UART_LSR_BI) {
291 status &= ~(UART_LSR_FE | UART_LSR_PE);
293 } else if (status & UART_LSR_PE)
295 else if (status & UART_LSR_FE)
297 if (status & UART_LSR_OE)
301 * Now check to see if character should be
302 * ignored, and mask off conditions which
305 if (status & info->ignore_status_mask)
308 status &= info->read_status_mask;
310 if (status & (UART_LSR_BI)) {
311 #ifdef SERIAL_DEBUG_INTR
312 printk("handling break....");
315 if (info->tport.flags & ASYNC_SAK)
316 do_SAK(info->tport.tty);
317 } else if (status & UART_LSR_PE)
319 else if (status & UART_LSR_FE)
321 if (status & UART_LSR_OE) {
323 * Overrun is special, since it's
324 * reported immediately, and doesn't
325 * affect the current character
330 tty_insert_flip_char(&info->tport, ch, flag);
332 tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN);
333 tty_flip_buffer_push(&info->tport);
338 static void transmit_chars(struct serial_state *info)
340 custom.intreq = IF_TBE;
343 custom.serdat = info->x_char | 0x100;
349 if (info->xmit.head == info->xmit.tail
350 || info->tport.tty->stopped
351 || info->tport.tty->hw_stopped) {
352 info->IER &= ~UART_IER_THRI;
353 custom.intena = IF_TBE;
358 custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
360 info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
363 if (CIRC_CNT(info->xmit.head,
365 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
366 tty_wakeup(info->tport.tty);
368 #ifdef SERIAL_DEBUG_INTR
371 if (info->xmit.head == info->xmit.tail) {
372 custom.intena = IF_TBE;
374 info->IER &= ~UART_IER_THRI;
378 static void check_modem_status(struct serial_state *info)
380 struct tty_port *port = &info->tport;
381 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
382 unsigned char dstatus;
383 struct async_icount *icount;
385 /* Determine bits that have changed */
386 dstatus = status ^ current_ctl_bits;
387 current_ctl_bits = status;
390 icount = &info->icount;
391 /* update input line counters */
392 if (dstatus & SER_DSR)
394 if (dstatus & SER_DCD) {
397 if (dstatus & SER_CTS)
399 wake_up_interruptible(&port->delta_msr_wait);
402 if (tty_port_check_carrier(port) && (dstatus & SER_DCD)) {
403 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
404 printk("ttyS%d CD now %s...", info->line,
405 (!(status & SER_DCD)) ? "on" : "off");
407 if (!(status & SER_DCD))
408 wake_up_interruptible(&port->open_wait);
410 #ifdef SERIAL_DEBUG_OPEN
411 printk("doing serial hangup...");
414 tty_hangup(port->tty);
417 if (tty_port_cts_enabled(port)) {
418 if (port->tty->hw_stopped) {
419 if (!(status & SER_CTS)) {
420 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
421 printk("CTS tx start...");
423 port->tty->hw_stopped = 0;
424 info->IER |= UART_IER_THRI;
425 custom.intena = IF_SETCLR | IF_TBE;
427 /* set a pending Tx Interrupt, transmitter should restart now */
428 custom.intreq = IF_SETCLR | IF_TBE;
430 tty_wakeup(port->tty);
434 if ((status & SER_CTS)) {
435 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
436 printk("CTS tx stop...");
438 port->tty->hw_stopped = 1;
439 info->IER &= ~UART_IER_THRI;
440 /* disable Tx interrupt and remove any pending interrupts */
441 custom.intena = IF_TBE;
443 custom.intreq = IF_TBE;
450 static irqreturn_t ser_vbl_int( int irq, void *data)
452 /* vbl is just a periodic interrupt we tie into to update modem status */
453 struct serial_state *info = data;
455 * TBD - is it better to unregister from this interrupt or to
456 * ignore it if MSI is clear ?
458 if(info->IER & UART_IER_MSI)
459 check_modem_status(info);
463 static irqreturn_t ser_rx_int(int irq, void *dev_id)
465 struct serial_state *info = dev_id;
467 #ifdef SERIAL_DEBUG_INTR
468 printk("ser_rx_int...");
471 if (!info->tport.tty)
475 #ifdef SERIAL_DEBUG_INTR
481 static irqreturn_t ser_tx_int(int irq, void *dev_id)
483 struct serial_state *info = dev_id;
485 if (custom.serdatr & SDR_TBE) {
486 #ifdef SERIAL_DEBUG_INTR
487 printk("ser_tx_int...");
490 if (!info->tport.tty)
493 transmit_chars(info);
494 #ifdef SERIAL_DEBUG_INTR
502 * -------------------------------------------------------------------
503 * Here ends the serial interrupt routines.
504 * -------------------------------------------------------------------
508 * ---------------------------------------------------------------
509 * Low level utility subroutines for the serial driver: routines to
510 * figure out the appropriate timeout for an interrupt chain, routines
511 * to initialize and startup a serial port, and routines to shutdown a
512 * serial port. Useful stuff like that.
513 * ---------------------------------------------------------------
516 static int startup(struct tty_struct *tty, struct serial_state *info)
518 struct tty_port *port = &info->tport;
523 page = get_zeroed_page(GFP_KERNEL);
527 local_irq_save(flags);
529 if (tty_port_initialized(port)) {
537 info->xmit.buf = (unsigned char *) page;
539 #ifdef SERIAL_DEBUG_OPEN
540 printk("starting up ttys%d ...", info->line);
543 /* Clear anything in the input buffer */
545 custom.intreq = IF_RBF;
548 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
550 if (serial_isroot()) {
551 set_bit(TTY_IO_ERROR, &tty->flags);
557 /* enable both Rx and Tx interrupts */
558 custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
560 info->IER = UART_IER_MSI;
562 /* remember current state of the DCD and CTS bits */
563 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
567 info->MCR = SER_DTR | SER_RTS;
568 rtsdtr_ctrl(info->MCR);
570 clear_bit(TTY_IO_ERROR, &tty->flags);
571 info->xmit.head = info->xmit.tail = 0;
574 * and set the speed of the serial port
576 change_speed(tty, info, NULL);
578 tty_port_set_initialized(port, 1);
579 local_irq_restore(flags);
583 local_irq_restore(flags);
588 * This routine will shutdown a serial port; interrupts are disabled, and
589 * DTR is dropped if the hangup on close termio flag is on.
591 static void shutdown(struct tty_struct *tty, struct serial_state *info)
594 struct serial_state *state;
596 if (!tty_port_initialized(&info->tport))
601 #ifdef SERIAL_DEBUG_OPEN
602 printk("Shutting down serial port %d ....\n", info->line);
605 local_irq_save(flags); /* Disable interrupts */
608 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
609 * here so the queue might never be waken up
611 wake_up_interruptible(&info->tport.delta_msr_wait);
614 * Free the IRQ, if necessary
616 free_irq(IRQ_AMIGA_VERTB, info);
618 if (info->xmit.buf) {
619 free_page((unsigned long) info->xmit.buf);
620 info->xmit.buf = NULL;
624 custom.intena = IF_RBF | IF_TBE;
627 /* disable break condition */
628 custom.adkcon = AC_UARTBRK;
632 info->MCR &= ~(SER_DTR|SER_RTS);
633 rtsdtr_ctrl(info->MCR);
635 set_bit(TTY_IO_ERROR, &tty->flags);
637 tty_port_set_initialized(&info->tport, 0);
638 local_irq_restore(flags);
643 * This routine is called to set the UART divisor registers to match
644 * the specified baud rate for a serial port.
646 static void change_speed(struct tty_struct *tty, struct serial_state *info,
647 struct ktermios *old_termios)
649 struct tty_port *port = &info->tport;
650 int quot = 0, baud_base, baud;
651 unsigned cflag, cval = 0;
655 cflag = tty->termios.c_cflag;
657 /* Byte size is always 8 bits plus parity bit if requested */
660 if (cflag & CSTOPB) {
664 if (cflag & PARENB) {
665 cval |= UART_LCR_PARITY;
668 if (!(cflag & PARODD))
669 cval |= UART_LCR_EPAR;
672 cval |= UART_LCR_SPAR;
675 /* Determine divisor based on baud rate */
676 baud = tty_get_baud_rate(tty);
678 baud = 9600; /* B0 transition handled in rs_set_termios */
679 baud_base = info->baud_base;
680 if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
681 quot = info->custom_divisor;
684 /* Special case since 134 is really 134.5 */
685 quot = (2*baud_base / 269);
687 quot = baud_base / baud;
689 /* If the quotient is zero refuse the change */
690 if (!quot && old_termios) {
691 /* FIXME: Will need updating for new tty in the end */
692 tty->termios.c_cflag &= ~CBAUD;
693 tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD);
694 baud = tty_get_baud_rate(tty);
698 (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
699 quot = info->custom_divisor;
702 /* Special case since 134 is really 134.5 */
703 quot = (2*baud_base / 269);
705 quot = baud_base / baud;
708 /* As a last resort, if the quotient is zero, default to 9600 bps */
710 quot = baud_base / 9600;
712 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
713 info->timeout += HZ/50; /* Add .02 seconds of slop */
715 /* CTS flow control flag and modem status interrupts */
716 info->IER &= ~UART_IER_MSI;
717 if (port->flags & ASYNC_HARDPPS_CD)
718 info->IER |= UART_IER_MSI;
719 tty_port_set_cts_flow(port, cflag & CRTSCTS);
721 info->IER |= UART_IER_MSI;
722 tty_port_set_check_carrier(port, ~cflag & CLOCAL);
724 info->IER |= UART_IER_MSI;
726 * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
730 * Set up parity check flag
733 info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
735 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
736 if (I_BRKINT(tty) || I_PARMRK(tty))
737 info->read_status_mask |= UART_LSR_BI;
740 * Characters to ignore
742 info->ignore_status_mask = 0;
744 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
746 info->ignore_status_mask |= UART_LSR_BI;
748 * If we're ignore parity and break indicators, ignore
749 * overruns too. (For real raw support).
752 info->ignore_status_mask |= UART_LSR_OE;
755 * !!! ignore all characters if CREAD is not set
757 if ((cflag & CREAD) == 0)
758 info->ignore_status_mask |= UART_LSR_DR;
759 local_irq_save(flags);
764 /* Set up the baud rate */
767 /* Enable or disable parity bit */
769 if(cval & UART_LCR_PARITY)
770 serper |= (SERPER_PARENB);
772 custom.serper = serper;
776 local_irq_restore(flags);
779 static int rs_put_char(struct tty_struct *tty, unsigned char ch)
781 struct serial_state *info;
784 info = tty->driver_data;
786 if (serial_paranoia_check(info, tty->name, "rs_put_char"))
792 local_irq_save(flags);
793 if (CIRC_SPACE(info->xmit.head,
795 SERIAL_XMIT_SIZE) == 0) {
796 local_irq_restore(flags);
800 info->xmit.buf[info->xmit.head++] = ch;
801 info->xmit.head &= SERIAL_XMIT_SIZE-1;
802 local_irq_restore(flags);
806 static void rs_flush_chars(struct tty_struct *tty)
808 struct serial_state *info = tty->driver_data;
811 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
814 if (info->xmit.head == info->xmit.tail
820 local_irq_save(flags);
821 info->IER |= UART_IER_THRI;
822 custom.intena = IF_SETCLR | IF_TBE;
824 /* set a pending Tx Interrupt, transmitter should restart now */
825 custom.intreq = IF_SETCLR | IF_TBE;
827 local_irq_restore(flags);
830 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
833 struct serial_state *info = tty->driver_data;
836 if (serial_paranoia_check(info, tty->name, "rs_write"))
842 local_irq_save(flags);
844 c = CIRC_SPACE_TO_END(info->xmit.head,
852 memcpy(info->xmit.buf + info->xmit.head, buf, c);
853 info->xmit.head = ((info->xmit.head + c) &
854 (SERIAL_XMIT_SIZE-1));
859 local_irq_restore(flags);
861 if (info->xmit.head != info->xmit.tail
864 && !(info->IER & UART_IER_THRI)) {
865 info->IER |= UART_IER_THRI;
867 custom.intena = IF_SETCLR | IF_TBE;
869 /* set a pending Tx Interrupt, transmitter should restart now */
870 custom.intreq = IF_SETCLR | IF_TBE;
872 local_irq_restore(flags);
877 static int rs_write_room(struct tty_struct *tty)
879 struct serial_state *info = tty->driver_data;
881 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
883 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
886 static int rs_chars_in_buffer(struct tty_struct *tty)
888 struct serial_state *info = tty->driver_data;
890 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
892 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
895 static void rs_flush_buffer(struct tty_struct *tty)
897 struct serial_state *info = tty->driver_data;
900 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
902 local_irq_save(flags);
903 info->xmit.head = info->xmit.tail = 0;
904 local_irq_restore(flags);
909 * This function is used to send a high-priority XON/XOFF character to
912 static void rs_send_xchar(struct tty_struct *tty, char ch)
914 struct serial_state *info = tty->driver_data;
917 if (serial_paranoia_check(info, tty->name, "rs_send_xchar"))
922 /* Make sure transmit interrupts are on */
925 local_irq_save(flags);
926 if(!(custom.intenar & IF_TBE)) {
927 custom.intena = IF_SETCLR | IF_TBE;
929 /* set a pending Tx Interrupt, transmitter should restart now */
930 custom.intreq = IF_SETCLR | IF_TBE;
933 local_irq_restore(flags);
935 info->IER |= UART_IER_THRI;
940 * ------------------------------------------------------------
943 * This routine is called by the upper-layer tty layer to signal that
944 * incoming characters should be throttled.
945 * ------------------------------------------------------------
947 static void rs_throttle(struct tty_struct * tty)
949 struct serial_state *info = tty->driver_data;
951 #ifdef SERIAL_DEBUG_THROTTLE
952 printk("throttle %s ....\n", tty_name(tty));
955 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
959 rs_send_xchar(tty, STOP_CHAR(tty));
962 info->MCR &= ~SER_RTS;
964 local_irq_save(flags);
965 rtsdtr_ctrl(info->MCR);
966 local_irq_restore(flags);
969 static void rs_unthrottle(struct tty_struct * tty)
971 struct serial_state *info = tty->driver_data;
973 #ifdef SERIAL_DEBUG_THROTTLE
974 printk("unthrottle %s ....\n", tty_name(tty));
977 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
984 rs_send_xchar(tty, START_CHAR(tty));
987 info->MCR |= SER_RTS;
988 local_irq_save(flags);
989 rtsdtr_ctrl(info->MCR);
990 local_irq_restore(flags);
994 * ------------------------------------------------------------
995 * rs_ioctl() and friends
996 * ------------------------------------------------------------
999 static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
1001 struct serial_state *state = tty->driver_data;
1004 ss->line = tty->index;
1005 ss->port = state->port;
1006 ss->flags = state->tport.flags;
1007 ss->xmit_fifo_size = state->xmit_fifo_size;
1008 ss->baud_base = state->baud_base;
1009 ss->close_delay = state->tport.close_delay;
1010 ss->closing_wait = state->tport.closing_wait;
1011 ss->custom_divisor = state->custom_divisor;
1016 static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
1018 struct serial_state *state = tty->driver_data;
1019 struct tty_port *port = &state->tport;
1024 change_spd = ((ss->flags ^ port->flags) & ASYNC_SPD_MASK) ||
1025 ss->custom_divisor != state->custom_divisor;
1026 if (ss->irq || ss->port != state->port ||
1027 ss->xmit_fifo_size != state->xmit_fifo_size) {
1032 if (!serial_isroot()) {
1033 if ((ss->baud_base != state->baud_base) ||
1034 (ss->close_delay != port->close_delay) ||
1035 (ss->closing_wait != port->closing_wait) ||
1036 (ss->xmit_fifo_size != state->xmit_fifo_size) ||
1037 ((ss->flags & ~ASYNC_USR_MASK) !=
1038 (port->flags & ~ASYNC_USR_MASK))) {
1042 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
1043 (ss->flags & ASYNC_USR_MASK));
1044 state->custom_divisor = ss->custom_divisor;
1045 goto check_and_exit;
1048 if (ss->baud_base < 9600) {
1054 * OK, past this point, all the error checking has been done.
1055 * At this point, we start making changes.....
1058 state->baud_base = ss->baud_base;
1059 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1060 (ss->flags & ASYNC_FLAGS));
1061 state->custom_divisor = ss->custom_divisor;
1062 port->close_delay = ss->close_delay * HZ/100;
1063 port->closing_wait = ss->closing_wait * HZ/100;
1064 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1067 if (tty_port_initialized(port)) {
1069 /* warn about deprecation unless clearing */
1070 if (ss->flags & ASYNC_SPD_MASK)
1071 dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n");
1072 change_speed(tty, state, NULL);
1075 retval = startup(tty, state);
1081 * get_lsr_info - get line status register info
1083 * Purpose: Let user call ioctl() to get info when the UART physically
1084 * is emptied. On bus types like RS485, the transmitter must
1085 * release the bus after transmitting. This must be done when
1086 * the transmit shift register is empty, not be done when the
1087 * transmit holding register is empty. This functionality
1088 * allows an RS485 driver to be written in user space.
1090 static int get_lsr_info(struct serial_state *info, unsigned int __user *value)
1092 unsigned char status;
1093 unsigned int result;
1094 unsigned long flags;
1096 local_irq_save(flags);
1097 status = custom.serdatr;
1099 local_irq_restore(flags);
1100 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1101 if (copy_to_user(value, &result, sizeof(int)))
1107 static int rs_tiocmget(struct tty_struct *tty)
1109 struct serial_state *info = tty->driver_data;
1110 unsigned char control, status;
1111 unsigned long flags;
1113 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1115 if (tty_io_error(tty))
1118 control = info->MCR;
1119 local_irq_save(flags);
1121 local_irq_restore(flags);
1122 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1123 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1124 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1125 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1126 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1129 static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
1132 struct serial_state *info = tty->driver_data;
1133 unsigned long flags;
1135 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1137 if (tty_io_error(tty))
1140 local_irq_save(flags);
1141 if (set & TIOCM_RTS)
1142 info->MCR |= SER_RTS;
1143 if (set & TIOCM_DTR)
1144 info->MCR |= SER_DTR;
1145 if (clear & TIOCM_RTS)
1146 info->MCR &= ~SER_RTS;
1147 if (clear & TIOCM_DTR)
1148 info->MCR &= ~SER_DTR;
1149 rtsdtr_ctrl(info->MCR);
1150 local_irq_restore(flags);
1155 * rs_break() --- routine which turns the break handling on or off
1157 static int rs_break(struct tty_struct *tty, int break_state)
1159 struct serial_state *info = tty->driver_data;
1160 unsigned long flags;
1162 if (serial_paranoia_check(info, tty->name, "rs_break"))
1165 local_irq_save(flags);
1166 if (break_state == -1)
1167 custom.adkcon = AC_SETCLR | AC_UARTBRK;
1169 custom.adkcon = AC_UARTBRK;
1171 local_irq_restore(flags);
1176 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1177 * Return: write counters to the user passed counter struct
1178 * NB: both 1->0 and 0->1 transitions are counted except for
1179 * RI where only 0->1 is counted.
1181 static int rs_get_icount(struct tty_struct *tty,
1182 struct serial_icounter_struct *icount)
1184 struct serial_state *info = tty->driver_data;
1185 struct async_icount cnow;
1186 unsigned long flags;
1188 local_irq_save(flags);
1189 cnow = info->icount;
1190 local_irq_restore(flags);
1191 icount->cts = cnow.cts;
1192 icount->dsr = cnow.dsr;
1193 icount->rng = cnow.rng;
1194 icount->dcd = cnow.dcd;
1195 icount->rx = cnow.rx;
1196 icount->tx = cnow.tx;
1197 icount->frame = cnow.frame;
1198 icount->overrun = cnow.overrun;
1199 icount->parity = cnow.parity;
1200 icount->brk = cnow.brk;
1201 icount->buf_overrun = cnow.buf_overrun;
1206 static int rs_ioctl(struct tty_struct *tty,
1207 unsigned int cmd, unsigned long arg)
1209 struct serial_state *info = tty->driver_data;
1210 struct async_icount cprev, cnow; /* kernel counter temps */
1211 void __user *argp = (void __user *)arg;
1212 unsigned long flags;
1216 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1219 if ((cmd != TIOCSERCONFIG) &&
1220 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1221 if (tty_io_error(tty))
1229 case TIOCSERGETLSR: /* Get line status register */
1230 return get_lsr_info(info, argp);
1233 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1234 * - mask passed in arg for lines of interest
1235 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1236 * Caller should use TIOCGICOUNT to see which one it was
1239 local_irq_save(flags);
1240 /* note the counters on entry */
1241 cprev = info->icount;
1242 local_irq_restore(flags);
1244 prepare_to_wait(&info->tport.delta_msr_wait,
1245 &wait, TASK_INTERRUPTIBLE);
1246 local_irq_save(flags);
1247 cnow = info->icount; /* atomic copy */
1248 local_irq_restore(flags);
1249 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1250 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
1251 ret = -EIO; /* no change => error */
1254 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1255 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1256 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1257 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1262 /* see if a signal did it */
1263 if (signal_pending(current)) {
1269 finish_wait(&info->tport.delta_msr_wait, &wait);
1273 return -ENOIOCTLCMD;
1278 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1280 struct serial_state *info = tty->driver_data;
1281 unsigned long flags;
1282 unsigned int cflag = tty->termios.c_cflag;
1284 change_speed(tty, info, old_termios);
1286 /* Handle transition to B0 status */
1287 if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) {
1288 info->MCR &= ~(SER_DTR|SER_RTS);
1289 local_irq_save(flags);
1290 rtsdtr_ctrl(info->MCR);
1291 local_irq_restore(flags);
1294 /* Handle transition away from B0 status */
1295 if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
1296 info->MCR |= SER_DTR;
1297 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
1298 info->MCR |= SER_RTS;
1299 local_irq_save(flags);
1300 rtsdtr_ctrl(info->MCR);
1301 local_irq_restore(flags);
1304 /* Handle turning off CRTSCTS */
1305 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1306 tty->hw_stopped = 0;
1312 * No need to wake up processes in open wait, since they
1313 * sample the CLOCAL flag once, and don't recheck it.
1314 * XXX It's not clear whether the current behavior is correct
1315 * or not. Hence, this may change.....
1317 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1318 wake_up_interruptible(&info->open_wait);
1323 * ------------------------------------------------------------
1326 * This routine is called when the serial port gets closed. First, we
1327 * wait for the last remaining data to be sent. Then, we unlink its
1328 * async structure from the interrupt chain if necessary, and we free
1329 * that IRQ if nothing is left in the chain.
1330 * ------------------------------------------------------------
1332 static void rs_close(struct tty_struct *tty, struct file * filp)
1334 struct serial_state *state = tty->driver_data;
1335 struct tty_port *port = &state->tport;
1337 if (serial_paranoia_check(state, tty->name, "rs_close"))
1340 if (tty_port_close_start(port, tty, filp) == 0)
1344 * At this point we stop accepting input. To do this, we
1345 * disable the receive line status interrupts, and tell the
1346 * interrupt driver to stop checking the data ready bit in the
1347 * line status register.
1349 state->read_status_mask &= ~UART_LSR_DR;
1350 if (tty_port_initialized(port)) {
1351 /* disable receive interrupts */
1352 custom.intena = IF_RBF;
1354 /* clear any pending receive interrupt */
1355 custom.intreq = IF_RBF;
1359 * Before we drop DTR, make sure the UART transmitter
1360 * has completely drained; this is especially
1361 * important if there is a transmit FIFO!
1363 rs_wait_until_sent(tty, state->timeout);
1365 shutdown(tty, state);
1366 rs_flush_buffer(tty);
1368 tty_ldisc_flush(tty);
1371 tty_port_close_end(port, tty);
1375 * rs_wait_until_sent() --- wait until the transmitter is empty
1377 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1379 struct serial_state *info = tty->driver_data;
1380 unsigned long orig_jiffies, char_time;
1383 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1386 if (info->xmit_fifo_size == 0)
1387 return; /* Just in case.... */
1389 orig_jiffies = jiffies;
1392 * Set the check interval to be 1/5 of the estimated time to
1393 * send a single character, and make it at least 1. The check
1394 * interval should also be less than the timeout.
1396 * Note: we have to use pretty tight timings here to satisfy
1399 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1400 char_time = char_time / 5;
1404 char_time = min_t(unsigned long, char_time, timeout);
1406 * If the transmitter hasn't cleared in twice the approximate
1407 * amount of time to send the entire FIFO, it probably won't
1408 * ever clear. This assumes the UART isn't doing flow
1409 * control, which is currently the case. Hence, if it ever
1410 * takes longer than info->timeout, this is probably due to a
1411 * UART bug of some kind. So, we clamp the timeout parameter at
1414 if (!timeout || timeout > 2*info->timeout)
1415 timeout = 2*info->timeout;
1416 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1417 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1418 printk("jiff=%lu...", jiffies);
1420 while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1421 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1422 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1424 msleep_interruptible(jiffies_to_msecs(char_time));
1425 if (signal_pending(current))
1427 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1430 __set_current_state(TASK_RUNNING);
1432 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1433 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1438 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1440 static void rs_hangup(struct tty_struct *tty)
1442 struct serial_state *info = tty->driver_data;
1444 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1447 rs_flush_buffer(tty);
1448 shutdown(tty, info);
1449 info->tport.count = 0;
1450 tty_port_set_active(&info->tport, 0);
1451 info->tport.tty = NULL;
1452 wake_up_interruptible(&info->tport.open_wait);
1456 * This routine is called whenever a serial port is opened. It
1457 * enables interrupts for a serial port, linking in its async structure into
1458 * the IRQ chain. It also performs the serial-specific
1459 * initialization for the tty structure.
1461 static int rs_open(struct tty_struct *tty, struct file * filp)
1463 struct serial_state *info = rs_table + tty->index;
1464 struct tty_port *port = &info->tport;
1469 tty->driver_data = info;
1471 if (serial_paranoia_check(info, tty->name, "rs_open"))
1474 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1476 retval = startup(tty, info);
1481 return tty_port_block_til_ready(port, tty, filp);
1485 * /proc fs routines....
1488 static inline void line_info(struct seq_file *m, int line,
1489 struct serial_state *state)
1491 char stat_buf[30], control, status;
1492 unsigned long flags;
1494 seq_printf(m, "%d: uart:amiga_builtin", line);
1496 local_irq_save(flags);
1498 control = tty_port_initialized(&state->tport) ? state->MCR : status;
1499 local_irq_restore(flags);
1503 if(!(control & SER_RTS))
1504 strcat(stat_buf, "|RTS");
1505 if(!(status & SER_CTS))
1506 strcat(stat_buf, "|CTS");
1507 if(!(control & SER_DTR))
1508 strcat(stat_buf, "|DTR");
1509 if(!(status & SER_DSR))
1510 strcat(stat_buf, "|DSR");
1511 if(!(status & SER_DCD))
1512 strcat(stat_buf, "|CD");
1515 seq_printf(m, " baud:%d", state->baud_base / state->quot);
1517 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1519 if (state->icount.frame)
1520 seq_printf(m, " fe:%d", state->icount.frame);
1522 if (state->icount.parity)
1523 seq_printf(m, " pe:%d", state->icount.parity);
1525 if (state->icount.brk)
1526 seq_printf(m, " brk:%d", state->icount.brk);
1528 if (state->icount.overrun)
1529 seq_printf(m, " oe:%d", state->icount.overrun);
1532 * Last thing is the RS-232 status lines
1534 seq_printf(m, " %s\n", stat_buf+1);
1537 static int rs_proc_show(struct seq_file *m, void *v)
1539 seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
1540 line_info(m, 0, &rs_table[0]);
1545 * ---------------------------------------------------------------------
1546 * rs_init() and friends
1548 * rs_init() is called at boot-time to initialize the serial driver.
1549 * ---------------------------------------------------------------------
1553 * This routine prints out the appropriate serial driver version
1554 * number, and identifies which options were configured into this
1557 static void show_serial_version(void)
1559 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1563 static const struct tty_operations serial_ops = {
1567 .put_char = rs_put_char,
1568 .flush_chars = rs_flush_chars,
1569 .write_room = rs_write_room,
1570 .chars_in_buffer = rs_chars_in_buffer,
1571 .flush_buffer = rs_flush_buffer,
1573 .throttle = rs_throttle,
1574 .unthrottle = rs_unthrottle,
1575 .set_termios = rs_set_termios,
1578 .hangup = rs_hangup,
1579 .break_ctl = rs_break,
1580 .send_xchar = rs_send_xchar,
1581 .wait_until_sent = rs_wait_until_sent,
1582 .tiocmget = rs_tiocmget,
1583 .tiocmset = rs_tiocmset,
1584 .get_icount = rs_get_icount,
1585 .set_serial = set_serial_info,
1586 .get_serial = get_serial_info,
1587 .proc_show = rs_proc_show,
1590 static int amiga_carrier_raised(struct tty_port *port)
1592 return !(ciab.pra & SER_DCD);
1595 static void amiga_dtr_rts(struct tty_port *port, int raise)
1597 struct serial_state *info = container_of(port, struct serial_state,
1599 unsigned long flags;
1602 info->MCR |= SER_DTR|SER_RTS;
1604 info->MCR &= ~(SER_DTR|SER_RTS);
1606 local_irq_save(flags);
1607 rtsdtr_ctrl(info->MCR);
1608 local_irq_restore(flags);
1611 static const struct tty_port_operations amiga_port_ops = {
1612 .carrier_raised = amiga_carrier_raised,
1613 .dtr_rts = amiga_dtr_rts,
1617 * The serial driver boot-time initialization code!
1619 static int __init amiga_serial_probe(struct platform_device *pdev)
1621 unsigned long flags;
1622 struct serial_state * state;
1625 serial_driver = alloc_tty_driver(NR_PORTS);
1629 show_serial_version();
1631 /* Initialize the tty_driver structure */
1633 serial_driver->driver_name = "amiserial";
1634 serial_driver->name = "ttyS";
1635 serial_driver->major = TTY_MAJOR;
1636 serial_driver->minor_start = 64;
1637 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1638 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1639 serial_driver->init_termios = tty_std_termios;
1640 serial_driver->init_termios.c_cflag =
1641 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1642 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1643 tty_set_operations(serial_driver, &serial_ops);
1646 state->port = (int)&custom.serdatr; /* Just to give it a value */
1647 state->custom_divisor = 0;
1648 state->icount.cts = state->icount.dsr =
1649 state->icount.rng = state->icount.dcd = 0;
1650 state->icount.rx = state->icount.tx = 0;
1651 state->icount.frame = state->icount.parity = 0;
1652 state->icount.overrun = state->icount.brk = 0;
1653 tty_port_init(&state->tport);
1654 state->tport.ops = &amiga_port_ops;
1655 tty_port_link_device(&state->tport, serial_driver, 0);
1657 error = tty_register_driver(serial_driver);
1659 goto fail_put_tty_driver;
1661 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
1663 /* Hardware set up */
1665 state->baud_base = amiga_colorclock;
1666 state->xmit_fifo_size = 1;
1668 /* set ISRs, and then disable the rx interrupts */
1669 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
1671 goto fail_unregister;
1673 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
1674 "serial RX", state);
1678 local_irq_save(flags);
1680 /* turn off Rx and Tx interrupts */
1681 custom.intena = IF_RBF | IF_TBE;
1684 /* clear any pending interrupt */
1685 custom.intreq = IF_RBF | IF_TBE;
1688 local_irq_restore(flags);
1691 * set the appropriate directions for the modem control flags,
1692 * and clear RTS and DTR
1694 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
1695 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
1697 platform_set_drvdata(pdev, state);
1702 free_irq(IRQ_AMIGA_TBE, state);
1704 tty_unregister_driver(serial_driver);
1705 fail_put_tty_driver:
1706 tty_port_destroy(&state->tport);
1707 put_tty_driver(serial_driver);
1711 static int __exit amiga_serial_remove(struct platform_device *pdev)
1714 struct serial_state *state = platform_get_drvdata(pdev);
1716 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
1717 error = tty_unregister_driver(serial_driver);
1719 printk("SERIAL: failed to unregister serial driver (%d)\n",
1721 put_tty_driver(serial_driver);
1722 tty_port_destroy(&state->tport);
1724 free_irq(IRQ_AMIGA_TBE, state);
1725 free_irq(IRQ_AMIGA_RBF, state);
1730 static struct platform_driver amiga_serial_driver = {
1731 .remove = __exit_p(amiga_serial_remove),
1733 .name = "amiga-serial",
1737 module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe);
1740 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1743 * ------------------------------------------------------------
1744 * Serial console driver
1745 * ------------------------------------------------------------
1748 static void amiga_serial_putc(char c)
1750 custom.serdat = (unsigned char)c | 0x100;
1751 while (!(custom.serdatr & 0x2000))
1756 * Print a string to the serial port trying not to disturb
1757 * any possible real use of the port...
1759 * The console must be locked when we get here.
1761 static void serial_console_write(struct console *co, const char *s,
1764 unsigned short intena = custom.intenar;
1766 custom.intena = IF_TBE;
1770 amiga_serial_putc('\r');
1771 amiga_serial_putc(*s++);
1774 custom.intena = IF_SETCLR | (intena & IF_TBE);
1777 static struct tty_driver *serial_console_device(struct console *c, int *index)
1780 return serial_driver;
1783 static struct console sercons = {
1785 .write = serial_console_write,
1786 .device = serial_console_device,
1787 .flags = CON_PRINTBUFFER,
1794 static int __init amiserial_console_init(void)
1799 register_console(&sercons);
1802 console_initcall(amiserial_console_init);
1804 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1806 MODULE_LICENSE("GPL");
1807 MODULE_ALIAS("platform:amiga-serial");