1	// SPDX-License-Identifier: GPL-2.0
2	/*
3	* Serial driver for the amiga builtin port.
4	*
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.
13	*
14	* The port is registered with the tty driver as minor device 64, and
15	* therefore other ports should only use 65 upwards.
16	*
17	* Richard Lucock 28/12/99
18	*
19	* Copyright (C) 1991, 1992 Linus Torvalds
20	* Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
21	* 1998, 1999 Theodore Ts'o
22	*
23	*/
24
25	/* Set of debugging defines */
26
27	#undef SERIAL_DEBUG_INTR
28	#undef SERIAL_DEBUG_OPEN
29	#undef SERIAL_DEBUG_FLOW
30	#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
31
32	/*
33	* End of serial driver configuration section.
34	*/
35
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>
47	#include <linux/mm.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/serial_core.h>
55	#include <linux/sched.h>
56	#include <linux/signal.h>
57	#include <linux/slab.h>
58	#include <linux/string.h>
59	#include <linux/timer.h>
60	#include <linux/tty_flip.h>
61	#include <linux/tty.h>
62	#include <linux/types.h>
63	#include <linux/uaccess.h>
64
65	#include <asm/amigahw.h>
66	#include <asm/amigaints.h>
67	#include <asm/irq.h>
68	#include <asm/setup.h>
69
70	struct serial_state {
71	struct tty_port tport;
72	struct circ_buf xmit;
73	struct async_icount icount;
74
75	unsigned long port;
76	int baud_base;
77	int custom_divisor;
78	int read_status_mask;
79	int ignore_status_mask;
80	int timeout;
81	int quot;
82	int IER; /* Interrupt Enable Register */
83	int MCR; /* Modem control register */
84	u8 x_char; /* xon/xoff character */
85	};
86
87	static struct tty_driver *serial_driver;
88
89	/* number of characters left in xmit buffer before we ask for more */
90	#define WAKEUP_CHARS 256
91
92	#define XMIT_FIFO_SIZE 1
93
94	static unsigned char current_ctl_bits;
95
96	static void change_speed(struct tty_struct *tty, struct serial_state *info,
97	const struct ktermios *old);
98	static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
99
100
101	static struct serial_state serial_state;
102
103	/* some serial hardware definitions */
104	#define SDR_OVRUN (1<<15)
105	#define SDR_RBF (1<<14)
106	#define SDR_TBE (1<<13)
107	#define SDR_TSRE (1<<12)
108
109	#define SERPER_PARENB (1<<15)
110
111	#define AC_SETCLR (1<<15)
112	#define AC_UARTBRK (1<<11)
113
114	#define SER_DTR (1<<7)
115	#define SER_RTS (1<<6)
116	#define SER_DCD (1<<5)
117	#define SER_CTS (1<<4)
118	#define SER_DSR (1<<3)
119
120	static __inline__ void rtsdtr_ctrl(int bits)
121	{
122	ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
123	}
124
125	/*
126	* ------------------------------------------------------------
127	* rs_stop() and rs_start()
128	*
129	* This routines are called before setting or resetting tty->flow.stopped.
130	* They enable or disable transmitter interrupts, as necessary.
131	* ------------------------------------------------------------
132	*/
133	static void rs_stop(struct tty_struct *tty)
134	{
135	struct serial_state *info = tty->driver_data;
136	unsigned long flags;
137
138	local_irq_save(flags);
139	if (info->IER & UART_IER_THRI) {
140	info->IER &= ~UART_IER_THRI;
141	/* disable Tx interrupt and remove any pending interrupts */
142	amiga_custom.intena = IF_TBE;
143	mb();
144	amiga_custom.intreq = IF_TBE;
145	mb();
146	}
147	local_irq_restore(flags);
148	}
149
150	static void rs_start(struct tty_struct *tty)
151	{
152	struct serial_state *info = tty->driver_data;
153	unsigned long flags;
154
155	local_irq_save(flags);
156	if (info->xmit.head != info->xmit.tail
157	&& info->xmit.buf
158	&& !(info->IER & UART_IER_THRI)) {
159	info->IER |= UART_IER_THRI;
160	amiga_custom.intena = IF_SETCLR | IF_TBE;
161	mb();
162	/* set a pending Tx Interrupt, transmitter should restart now */
163	amiga_custom.intreq = IF_SETCLR | IF_TBE;
164	mb();
165	}
166	local_irq_restore(flags);
167	}
168
169	/*
170	* ----------------------------------------------------------------------
171	*
172	* Here start the interrupt handling routines.
173	*
174	* -----------------------------------------------------------------------
175	*/
176
177	static void receive_chars(struct serial_state *info)
178	{
179	int status;
180	int serdatr;
181	u8 ch, flag;
182	struct async_icount *icount;
183	bool overrun = false;
184
185	icount = &info->icount;
186
187	status = UART_LSR_DR; /* We obviously have a character! */
188	serdatr = amiga_custom.serdatr;
189	mb();
190	amiga_custom.intreq = IF_RBF;
191	mb();
192
193	if((serdatr & 0x1ff) == 0)
194	status |= UART_LSR_BI;
195	if(serdatr & SDR_OVRUN)
196	status |= UART_LSR_OE;
197
198	ch = serdatr & 0xff;
199	icount->rx++;
200
201	#ifdef SERIAL_DEBUG_INTR
202	printk("DR%02x:%02x...", ch, status);
203	#endif
204	flag = TTY_NORMAL;
205
206	/*
207	* We don't handle parity or frame errors - but I have left
208	* the code in, since I'm not sure that the errors can't be
209	* detected.
210	*/
211
212	if (status & (UART_LSR_BI | UART_LSR_PE |
213	UART_LSR_FE | UART_LSR_OE)) {
214	/*
215	* For statistics only
216	*/
217	if (status & UART_LSR_BI) {
218	status &= ~(UART_LSR_FE | UART_LSR_PE);
219	icount->brk++;
220	} else if (status & UART_LSR_PE)
221	icount->parity++;
222	else if (status & UART_LSR_FE)
223	icount->frame++;
224	if (status & UART_LSR_OE)
225	icount->overrun++;
226
227	/*
228	* Now check to see if character should be
229	* ignored, and mask off conditions which
230	* should be ignored.
231	*/
232	if (status & info->ignore_status_mask)
233	return;
234
235	status &= info->read_status_mask;
236
237	if (status & (UART_LSR_BI)) {
238	#ifdef SERIAL_DEBUG_INTR
239	printk("handling break....");
240	#endif
241	flag = TTY_BREAK;
242	if (info->tport.flags & ASYNC_SAK)
243	do_SAK(tty: info->tport.tty);
244	} else if (status & UART_LSR_PE)
245	flag = TTY_PARITY;
246	else if (status & UART_LSR_FE)
247	flag = TTY_FRAME;
248	if (status & UART_LSR_OE) {
249	/*
250	* Overrun is special, since it's
251	* reported immediately, and doesn't
252	* affect the current character
253	*/
254	overrun = true;
255	}
256	}
257	tty_insert_flip_char(port: &info->tport, ch, flag);
258	if (overrun)
259	tty_insert_flip_char(port: &info->tport, ch: 0, TTY_OVERRUN);
260	tty_flip_buffer_push(port: &info->tport);
261	}
262
263	static void transmit_chars(struct serial_state *info)
264	{
265	amiga_custom.intreq = IF_TBE;
266	mb();
267	if (info->x_char) {
268	amiga_custom.serdat = info->x_char | 0x100;
269	mb();
270	info->icount.tx++;
271	info->x_char = 0;
272	return;
273	}
274	if (info->xmit.head == info->xmit.tail
275	|| info->tport.tty->flow.stopped
276	|| info->tport.tty->hw_stopped) {
277	info->IER &= ~UART_IER_THRI;
278	amiga_custom.intena = IF_TBE;
279	mb();
280	return;
281	}
282
283	amiga_custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
284	mb();
285	info->xmit.tail = info->xmit.tail & (UART_XMIT_SIZE - 1);
286	info->icount.tx++;
287
288	if (CIRC_CNT(info->xmit.head,
289	info->xmit.tail,
290	UART_XMIT_SIZE) < WAKEUP_CHARS)
291	tty_wakeup(tty: info->tport.tty);
292
293	#ifdef SERIAL_DEBUG_INTR
294	printk("THRE...");
295	#endif
296	if (info->xmit.head == info->xmit.tail) {
297	amiga_custom.intena = IF_TBE;
298	mb();
299	info->IER &= ~UART_IER_THRI;
300	}
301	}
302
303	static void check_modem_status(struct serial_state *info)
304	{
305	struct tty_port *port = &info->tport;
306	unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
307	unsigned char dstatus;
308	struct async_icount *icount;
309
310	/* Determine bits that have changed */
311	dstatus = status ^ current_ctl_bits;
312	current_ctl_bits = status;
313
314	if (dstatus) {
315	icount = &info->icount;
316	/* update input line counters */
317	if (dstatus & SER_DSR)
318	icount->dsr++;
319	if (dstatus & SER_DCD) {
320	icount->dcd++;
321	}
322	if (dstatus & SER_CTS)
323	icount->cts++;
324	wake_up_interruptible(&port->delta_msr_wait);
325	}
326
327	if (tty_port_check_carrier(port) && (dstatus & SER_DCD)) {
328	#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
329	printk("ttyS%d CD now %s...", info->line,
330	(!(status & SER_DCD)) ? "on" : "off");
331	#endif
332	if (!(status & SER_DCD))
333	wake_up_interruptible(&port->open_wait);
334	else {
335	#ifdef SERIAL_DEBUG_OPEN
336	printk("doing serial hangup...");
337	#endif
338	if (port->tty)
339	tty_hangup(tty: port->tty);
340	}
341	}
342	if (tty_port_cts_enabled(port)) {
343	if (port->tty->hw_stopped) {
344	if (!(status & SER_CTS)) {
345	#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
346	printk("CTS tx start...");
347	#endif
348	port->tty->hw_stopped = false;
349	info->IER |= UART_IER_THRI;
350	amiga_custom.intena = IF_SETCLR | IF_TBE;
351	mb();
352	/* set a pending Tx Interrupt, transmitter should restart now */
353	amiga_custom.intreq = IF_SETCLR | IF_TBE;
354	mb();
355	tty_wakeup(tty: port->tty);
356	return;
357	}
358	} else {
359	if ((status & SER_CTS)) {
360	#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
361	printk("CTS tx stop...");
362	#endif
363	port->tty->hw_stopped = true;
364	info->IER &= ~UART_IER_THRI;
365	/* disable Tx interrupt and remove any pending interrupts */
366	amiga_custom.intena = IF_TBE;
367	mb();
368	amiga_custom.intreq = IF_TBE;
369	mb();
370	}
371	}
372	}
373	}
374
375	static irqreturn_t ser_vbl_int( int irq, void *data)
376	{
377	/* vbl is just a periodic interrupt we tie into to update modem status */
378	struct serial_state *info = data;
379	/*
380	* TBD - is it better to unregister from this interrupt or to
381	* ignore it if MSI is clear ?
382	*/
383	if(info->IER & UART_IER_MSI)
384	check_modem_status(info);
385	return IRQ_HANDLED;
386	}
387
388	static irqreturn_t ser_rx_int(int irq, void *dev_id)
389	{
390	struct serial_state *info = dev_id;
391
392	#ifdef SERIAL_DEBUG_INTR
393	printk("ser_rx_int...");
394	#endif
395
396	if (!info->tport.tty)
397	return IRQ_NONE;
398
399	receive_chars(info);
400	#ifdef SERIAL_DEBUG_INTR
401	printk("end.\n");
402	#endif
403	return IRQ_HANDLED;
404	}
405
406	static irqreturn_t ser_tx_int(int irq, void *dev_id)
407	{
408	struct serial_state *info = dev_id;
409
410	if (amiga_custom.serdatr & SDR_TBE) {
411	#ifdef SERIAL_DEBUG_INTR
412	printk("ser_tx_int...");
413	#endif
414
415	if (!info->tport.tty)
416	return IRQ_NONE;
417
418	transmit_chars(info);
419	#ifdef SERIAL_DEBUG_INTR
420	printk("end.\n");
421	#endif
422	}
423	return IRQ_HANDLED;
424	}
425
426	/*
427	* -------------------------------------------------------------------
428	* Here ends the serial interrupt routines.
429	* -------------------------------------------------------------------
430	*/
431
432	/*
433	* ---------------------------------------------------------------
434	* Low level utility subroutines for the serial driver: routines to
435	* figure out the appropriate timeout for an interrupt chain, routines
436	* to initialize and startup a serial port, and routines to shutdown a
437	* serial port. Useful stuff like that.
438	* ---------------------------------------------------------------
439	*/
440
441	static int startup(struct tty_struct *tty, struct serial_state *info)
442	{
443	struct tty_port *port = &info->tport;
444	unsigned long flags;
445	int retval=0;
446	unsigned long page;
447
448	page = get_zeroed_page(GFP_KERNEL);
449	if (!page)
450	return -ENOMEM;
451
452	local_irq_save(flags);
453
454	if (tty_port_initialized(port)) {
455	free_page(page);
456	goto errout;
457	}
458
459	if (info->xmit.buf)
460	free_page(page);
461	else
462	info->xmit.buf = (unsigned char *) page;
463
464	#ifdef SERIAL_DEBUG_OPEN
465	printk("starting up ttys%d ...", info->line);
466	#endif
467
468	/* Clear anything in the input buffer */
469
470	amiga_custom.intreq = IF_RBF;
471	mb();
472
473	retval = request_irq(irq: IRQ_AMIGA_VERTB, handler: ser_vbl_int, flags: 0, name: "serial status", dev: info);
474	if (retval) {
475	if (capable(CAP_SYS_ADMIN)) {
476	set_bit(TTY_IO_ERROR, addr: &tty->flags);
477	retval = 0;
478	}
479	goto errout;
480	}
481
482	/* enable both Rx and Tx interrupts */
483	amiga_custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
484	mb();
485	info->IER = UART_IER_MSI;
486
487	/* remember current state of the DCD and CTS bits */
488	current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
489
490	info->MCR = 0;
491	if (C_BAUD(tty))
492	info->MCR = SER_DTR | SER_RTS;
493	rtsdtr_ctrl(bits: info->MCR);
494
495	clear_bit(TTY_IO_ERROR, addr: &tty->flags);
496	info->xmit.head = info->xmit.tail = 0;
497
498	/*
499	* and set the speed of the serial port
500	*/
501	change_speed(tty, info, NULL);
502
503	tty_port_set_initialized(port, val: true);
504	local_irq_restore(flags);
505	return 0;
506
507	errout:
508	local_irq_restore(flags);
509	return retval;
510	}
511
512	/*
513	* This routine will shutdown a serial port; interrupts are disabled, and
514	* DTR is dropped if the hangup on close termio flag is on.
515	*/
516	static void shutdown(struct tty_struct *tty, struct serial_state *info)
517	{
518	unsigned long flags;
519
520	if (!tty_port_initialized(port: &info->tport))
521	return;
522
523	#ifdef SERIAL_DEBUG_OPEN
524	printk("Shutting down serial port %d ....\n", info->line);
525	#endif
526
527	local_irq_save(flags); /* Disable interrupts */
528
529	/*
530	* clear delta_msr_wait queue to avoid mem leaks: we may free the irq
531	* here so the queue might never be waken up
532	*/
533	wake_up_interruptible(&info->tport.delta_msr_wait);
534
535	/*
536	* Free the IRQ, if necessary
537	*/
538	free_irq(IRQ_AMIGA_VERTB, info);
539
540	free_page((unsigned long)info->xmit.buf);
541	info->xmit.buf = NULL;
542
543	info->IER = 0;
544	amiga_custom.intena = IF_RBF | IF_TBE;
545	mb();
546
547	/* disable break condition */
548	amiga_custom.adkcon = AC_UARTBRK;
549	mb();
550
551	if (C_HUPCL(tty))
552	info->MCR &= ~(SER_DTR|SER_RTS);
553	rtsdtr_ctrl(bits: info->MCR);
554
555	set_bit(TTY_IO_ERROR, addr: &tty->flags);
556
557	tty_port_set_initialized(port: &info->tport, val: false);
558	local_irq_restore(flags);
559	}
560
561
562	/*
563	* This routine is called to set the UART divisor registers to match
564	* the specified baud rate for a serial port.
565	*/
566	static void change_speed(struct tty_struct *tty, struct serial_state *info,
567	const struct ktermios *old_termios)
568	{
569	struct tty_port *port = &info->tport;
570	int quot = 0, baud_base, baud;
571	unsigned cflag, cval = 0;
572	int bits;
573	unsigned long flags;
574
575	cflag = tty->termios.c_cflag;
576
577	/* Byte size is always 8 bits plus parity bit if requested */
578
579	cval = 3; bits = 10;
580	if (cflag & CSTOPB) {
581	cval |= 0x04;
582	bits++;
583	}
584	if (cflag & PARENB) {
585	cval |= UART_LCR_PARITY;
586	bits++;
587	}
588	if (!(cflag & PARODD))
589	cval |= UART_LCR_EPAR;
590	if (cflag & CMSPAR)
591	cval |= UART_LCR_SPAR;
592
593	/* Determine divisor based on baud rate */
594	baud = tty_get_baud_rate(tty);
595	if (!baud)
596	baud = 9600; /* B0 transition handled in rs_set_termios */
597	baud_base = info->baud_base;
598	if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
599	quot = info->custom_divisor;
600	else {
601	if (baud == 134)
602	/* Special case since 134 is really 134.5 */
603	quot = (2*baud_base / 269);
604	else if (baud)
605	quot = baud_base / baud;
606	}
607	/* If the quotient is zero refuse the change */
608	if (!quot && old_termios) {
609	/* FIXME: Will need updating for new tty in the end */
610	tty->termios.c_cflag &= ~CBAUD;
611	tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD);
612	baud = tty_get_baud_rate(tty);
613	if (!baud)
614	baud = 9600;
615	if (baud == 38400 &&
616	(port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
617	quot = info->custom_divisor;
618	else {
619	if (baud == 134)
620	/* Special case since 134 is really 134.5 */
621	quot = (2*baud_base / 269);
622	else if (baud)
623	quot = baud_base / baud;
624	}
625	}
626	/* As a last resort, if the quotient is zero, default to 9600 bps */
627	if (!quot)
628	quot = baud_base / 9600;
629	info->quot = quot;
630	info->timeout = (XMIT_FIFO_SIZE*HZ*bits*quot) / baud_base;
631	info->timeout += HZ/50; /* Add .02 seconds of slop */
632
633	/* CTS flow control flag and modem status interrupts */
634	info->IER &= ~UART_IER_MSI;
635	if (port->flags & ASYNC_HARDPPS_CD)
636	info->IER |= UART_IER_MSI;
637	tty_port_set_cts_flow(port, val: cflag & CRTSCTS);
638	if (cflag & CRTSCTS)
639	info->IER |= UART_IER_MSI;
640	tty_port_set_check_carrier(port, val: ~cflag & CLOCAL);
641	if (~cflag & CLOCAL)
642	info->IER |= UART_IER_MSI;
643	/* TBD:
644	* Does clearing IER_MSI imply that we should disable the VBL interrupt ?
645	*/
646
647	/*
648	* Set up parity check flag
649	*/
650
651	info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
652	if (I_INPCK(tty))
653	info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
654	if (I_BRKINT(tty) || I_PARMRK(tty))
655	info->read_status_mask |= UART_LSR_BI;
656
657	/*
658	* Characters to ignore
659	*/
660	info->ignore_status_mask = 0;
661	if (I_IGNPAR(tty))
662	info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
663	if (I_IGNBRK(tty)) {
664	info->ignore_status_mask |= UART_LSR_BI;
665	/*
666	* If we're ignore parity and break indicators, ignore
667	* overruns too. (For real raw support).
668	*/
669	if (I_IGNPAR(tty))
670	info->ignore_status_mask |= UART_LSR_OE;
671	}
672	/*
673	* !!! ignore all characters if CREAD is not set
674	*/
675	if ((cflag & CREAD) == 0)
676	info->ignore_status_mask |= UART_LSR_DR;
677	local_irq_save(flags);
678
679	{
680	short serper;
681
682	/* Set up the baud rate */
683	serper = quot - 1;
684
685	/* Enable or disable parity bit */
686
687	if(cval & UART_LCR_PARITY)
688	serper |= (SERPER_PARENB);
689
690	amiga_custom.serper = serper;
691	mb();
692	}
693
694	local_irq_restore(flags);
695	}
696
697	static int rs_put_char(struct tty_struct *tty, u8 ch)
698	{
699	struct serial_state *info;
700	unsigned long flags;
701
702	info = tty->driver_data;
703
704	if (!info->xmit.buf)
705	return 0;
706
707	local_irq_save(flags);
708	if (CIRC_SPACE(info->xmit.head,
709	info->xmit.tail,
710	UART_XMIT_SIZE) == 0) {
711	local_irq_restore(flags);
712	return 0;
713	}
714
715	info->xmit.buf[info->xmit.head++] = ch;
716	info->xmit.head &= UART_XMIT_SIZE - 1;
717	local_irq_restore(flags);
718	return 1;
719	}
720
721	static void rs_flush_chars(struct tty_struct *tty)
722	{
723	struct serial_state *info = tty->driver_data;
724	unsigned long flags;
725
726	if (info->xmit.head == info->xmit.tail
727	|| tty->flow.stopped
728	|| tty->hw_stopped
729	|| !info->xmit.buf)
730	return;
731
732	local_irq_save(flags);
733	info->IER |= UART_IER_THRI;
734	amiga_custom.intena = IF_SETCLR | IF_TBE;
735	mb();
736	/* set a pending Tx Interrupt, transmitter should restart now */
737	amiga_custom.intreq = IF_SETCLR | IF_TBE;
738	mb();
739	local_irq_restore(flags);
740	}
741
742	static ssize_t rs_write(struct tty_struct * tty, const u8 *buf, size_t count)
743	{
744	int c, ret = 0;
745	struct serial_state *info = tty->driver_data;
746	unsigned long flags;
747
748	if (!info->xmit.buf)
749	return 0;
750
751	local_irq_save(flags);
752	while (1) {
753	c = CIRC_SPACE_TO_END(info->xmit.head,
754	info->xmit.tail,
755	UART_XMIT_SIZE);
756	if (count < c)
757	c = count;
758	if (c <= 0) {
759	break;
760	}
761	memcpy(info->xmit.buf + info->xmit.head, buf, c);
762	info->xmit.head = (info->xmit.head + c) & (UART_XMIT_SIZE - 1);
763	buf += c;
764	count -= c;
765	ret += c;
766	}
767	local_irq_restore(flags);
768
769	if (info->xmit.head != info->xmit.tail
770	&& !tty->flow.stopped
771	&& !tty->hw_stopped
772	&& !(info->IER & UART_IER_THRI)) {
773	info->IER |= UART_IER_THRI;
774	local_irq_disable();
775	amiga_custom.intena = IF_SETCLR | IF_TBE;
776	mb();
777	/* set a pending Tx Interrupt, transmitter should restart now */
778	amiga_custom.intreq = IF_SETCLR | IF_TBE;
779	mb();
780	local_irq_restore(flags);
781	}
782	return ret;
783	}
784
785	static unsigned int rs_write_room(struct tty_struct *tty)
786	{
787	struct serial_state *info = tty->driver_data;
788
789	return CIRC_SPACE(info->xmit.head, info->xmit.tail, UART_XMIT_SIZE);
790	}
791
792	static unsigned int rs_chars_in_buffer(struct tty_struct *tty)
793	{
794	struct serial_state *info = tty->driver_data;
795
796	return CIRC_CNT(info->xmit.head, info->xmit.tail, UART_XMIT_SIZE);
797	}
798
799	static void rs_flush_buffer(struct tty_struct *tty)
800	{
801	struct serial_state *info = tty->driver_data;
802	unsigned long flags;
803
804	local_irq_save(flags);
805	info->xmit.head = info->xmit.tail = 0;
806	local_irq_restore(flags);
807	tty_wakeup(tty);
808	}
809
810	/*
811	* This function is used to send a high-priority XON/XOFF character to
812	* the device
813	*/
814	static void rs_send_xchar(struct tty_struct *tty, u8 ch)
815	{
816	struct serial_state *info = tty->driver_data;
817	unsigned long flags;
818
819	info->x_char = ch;
820	if (ch) {
821	/* Make sure transmit interrupts are on */
822
823	/* Check this ! */
824	local_irq_save(flags);
825	if(!(amiga_custom.intenar & IF_TBE)) {
826	amiga_custom.intena = IF_SETCLR | IF_TBE;
827	mb();
828	/* set a pending Tx Interrupt, transmitter should restart now */
829	amiga_custom.intreq = IF_SETCLR | IF_TBE;
830	mb();
831	}
832	local_irq_restore(flags);
833
834	info->IER |= UART_IER_THRI;
835	}
836	}
837
838	/*
839	* ------------------------------------------------------------
840	* rs_throttle()
841	*
842	* This routine is called by the upper-layer tty layer to signal that
843	* incoming characters should be throttled.
844	* ------------------------------------------------------------
845	*/
846	static void rs_throttle(struct tty_struct * tty)
847	{
848	struct serial_state *info = tty->driver_data;
849	unsigned long flags;
850	#ifdef SERIAL_DEBUG_THROTTLE
851	printk("throttle %s ....\n", tty_name(tty));
852	#endif
853
854	if (I_IXOFF(tty))
855	rs_send_xchar(tty, STOP_CHAR(tty));
856
857	if (C_CRTSCTS(tty))
858	info->MCR &= ~SER_RTS;
859
860	local_irq_save(flags);
861	rtsdtr_ctrl(bits: info->MCR);
862	local_irq_restore(flags);
863	}
864
865	static void rs_unthrottle(struct tty_struct * tty)
866	{
867	struct serial_state *info = tty->driver_data;
868	unsigned long flags;
869	#ifdef SERIAL_DEBUG_THROTTLE
870	printk("unthrottle %s ....\n", tty_name(tty));
871	#endif
872
873	if (I_IXOFF(tty)) {
874	if (info->x_char)
875	info->x_char = 0;
876	else
877	rs_send_xchar(tty, START_CHAR(tty));
878	}
879	if (C_CRTSCTS(tty))
880	info->MCR |= SER_RTS;
881	local_irq_save(flags);
882	rtsdtr_ctrl(bits: info->MCR);
883	local_irq_restore(flags);
884	}
885
886	/*
887	* ------------------------------------------------------------
888	* rs_ioctl() and friends
889	* ------------------------------------------------------------
890	*/
891
892	static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
893	{
894	struct serial_state *state = tty->driver_data;
895	unsigned int close_delay, closing_wait;
896
897	tty_lock(tty);
898	close_delay = jiffies_to_msecs(j: state->tport.close_delay) / 10;
899	closing_wait = state->tport.closing_wait;
900	if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
901	closing_wait = jiffies_to_msecs(j: closing_wait) / 10;
902
903	ss->line = tty->index;
904	ss->port = state->port;
905	ss->flags = state->tport.flags;
906	ss->xmit_fifo_size = XMIT_FIFO_SIZE;
907	ss->baud_base = state->baud_base;
908	ss->close_delay = close_delay;
909	ss->closing_wait = closing_wait;
910	ss->custom_divisor = state->custom_divisor;
911	tty_unlock(tty);
912	return 0;
913	}
914
915	static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
916	{
917	struct serial_state *state = tty->driver_data;
918	struct tty_port *port = &state->tport;
919	bool change_spd;
920	int retval = 0;
921	unsigned int close_delay, closing_wait;
922
923	tty_lock(tty);
924	change_spd = ((ss->flags ^ port->flags) & ASYNC_SPD_MASK) ||
925	ss->custom_divisor != state->custom_divisor;
926	if (ss->irq || ss->port != state->port ||
927	ss->xmit_fifo_size != XMIT_FIFO_SIZE) {
928	tty_unlock(tty);
929	return -EINVAL;
930	}
931
932	close_delay = msecs_to_jiffies(m: ss->close_delay * 10);
933	closing_wait = ss->closing_wait;
934	if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
935	closing_wait = msecs_to_jiffies(m: closing_wait * 10);
936
937	if (!capable(CAP_SYS_ADMIN)) {
938	if ((ss->baud_base != state->baud_base) ||
939	(close_delay != port->close_delay) ||
940	(closing_wait != port->closing_wait) ||
941	((ss->flags & ~ASYNC_USR_MASK) !=
942	(port->flags & ~ASYNC_USR_MASK))) {
943	tty_unlock(tty);
944	return -EPERM;
945	}
946	port->flags = ((port->flags & ~ASYNC_USR_MASK) |
947	(ss->flags & ASYNC_USR_MASK));
948	state->custom_divisor = ss->custom_divisor;
949	goto check_and_exit;
950	}
951
952	if (ss->baud_base < 9600) {
953	tty_unlock(tty);
954	return -EINVAL;
955	}
956
957	/*
958	* OK, past this point, all the error checking has been done.
959	* At this point, we start making changes.....
960	*/
961
962	state->baud_base = ss->baud_base;
963	port->flags = ((port->flags & ~ASYNC_FLAGS) |
964	(ss->flags & ASYNC_FLAGS));
965	state->custom_divisor = ss->custom_divisor;
966	port->close_delay = close_delay;
967	port->closing_wait = closing_wait;
968
969	check_and_exit:
970	if (tty_port_initialized(port)) {
971	if (change_spd) {
972	/* warn about deprecation unless clearing */
973	if (ss->flags & ASYNC_SPD_MASK)
974	dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n");
975	change_speed(tty, info: state, NULL);
976	}
977	} else
978	retval = startup(tty, info: state);
979	tty_unlock(tty);
980	return retval;
981	}
982
983	/*
984	* get_lsr_info - get line status register info
985	*
986	* Purpose: Let user call ioctl() to get info when the UART physically
987	* is emptied. On bus types like RS485, the transmitter must
988	* release the bus after transmitting. This must be done when
989	* the transmit shift register is empty, not be done when the
990	* transmit holding register is empty. This functionality
991	* allows an RS485 driver to be written in user space.
992	*/
993	static int get_lsr_info(struct serial_state *info, unsigned int __user *value)
994	{
995	unsigned char status;
996	unsigned int result;
997	unsigned long flags;
998
999	local_irq_save(flags);
1000	status = amiga_custom.serdatr;
1001	mb();
1002	local_irq_restore(flags);
1003	result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1004	if (copy_to_user(to: value, from: &result, n: sizeof(int)))
1005	return -EFAULT;
1006	return 0;
1007	}
1008
1009
1010	static int rs_tiocmget(struct tty_struct *tty)
1011	{
1012	struct serial_state *info = tty->driver_data;
1013	unsigned char control, status;
1014	unsigned long flags;
1015
1016	if (tty_io_error(tty))
1017	return -EIO;
1018
1019	control = info->MCR;
1020	local_irq_save(flags);
1021	status = ciab.pra;
1022	local_irq_restore(flags);
1023	return ((control & SER_RTS) ? TIOCM_RTS : 0)
1024	| ((control & SER_DTR) ? TIOCM_DTR : 0)
1025	| (!(status & SER_DCD) ? TIOCM_CAR : 0)
1026	| (!(status & SER_DSR) ? TIOCM_DSR : 0)
1027	| (!(status & SER_CTS) ? TIOCM_CTS : 0);
1028	}
1029
1030	static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
1031	unsigned int clear)
1032	{
1033	struct serial_state *info = tty->driver_data;
1034	unsigned long flags;
1035
1036	if (tty_io_error(tty))
1037	return -EIO;
1038
1039	local_irq_save(flags);
1040	if (set & TIOCM_RTS)
1041	info->MCR |= SER_RTS;
1042	if (set & TIOCM_DTR)
1043	info->MCR |= SER_DTR;
1044	if (clear & TIOCM_RTS)
1045	info->MCR &= ~SER_RTS;
1046	if (clear & TIOCM_DTR)
1047	info->MCR &= ~SER_DTR;
1048	rtsdtr_ctrl(bits: info->MCR);
1049	local_irq_restore(flags);
1050	return 0;
1051	}
1052
1053	/*
1054	* rs_break() --- routine which turns the break handling on or off
1055	*/
1056	static int rs_break(struct tty_struct *tty, int break_state)
1057	{
1058	unsigned long flags;
1059
1060	local_irq_save(flags);
1061	if (break_state == -1)
1062	amiga_custom.adkcon = AC_SETCLR | AC_UARTBRK;
1063	else
1064	amiga_custom.adkcon = AC_UARTBRK;
1065	mb();
1066	local_irq_restore(flags);
1067	return 0;
1068	}
1069
1070	/*
1071	* Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1072	* Return: write counters to the user passed counter struct
1073	* NB: both 1->0 and 0->1 transitions are counted except for
1074	* RI where only 0->1 is counted.
1075	*/
1076	static int rs_get_icount(struct tty_struct *tty,
1077	struct serial_icounter_struct *icount)
1078	{
1079	struct serial_state *info = tty->driver_data;
1080	struct async_icount cnow;
1081	unsigned long flags;
1082
1083	local_irq_save(flags);
1084	cnow = info->icount;
1085	local_irq_restore(flags);
1086	icount->cts = cnow.cts;
1087	icount->dsr = cnow.dsr;
1088	icount->rng = cnow.rng;
1089	icount->dcd = cnow.dcd;
1090	icount->rx = cnow.rx;
1091	icount->tx = cnow.tx;
1092	icount->frame = cnow.frame;
1093	icount->overrun = cnow.overrun;
1094	icount->parity = cnow.parity;
1095	icount->brk = cnow.brk;
1096	icount->buf_overrun = cnow.buf_overrun;
1097
1098	return 0;
1099	}
1100
1101	static int rs_ioctl(struct tty_struct *tty,
1102	unsigned int cmd, unsigned long arg)
1103	{
1104	struct serial_state *info = tty->driver_data;
1105	struct async_icount cprev, cnow; /* kernel counter temps */
1106	void __user *argp = (void __user *)arg;
1107	unsigned long flags;
1108	DEFINE_WAIT(wait);
1109	int ret;
1110
1111	if ((cmd != TIOCSERCONFIG) &&
1112	(cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1113	if (tty_io_error(tty))
1114	return -EIO;
1115	}
1116
1117	switch (cmd) {
1118	case TIOCSERCONFIG:
1119	return 0;
1120
1121	case TIOCSERGETLSR: /* Get line status register */
1122	return get_lsr_info(info, value: argp);
1123
1124	/*
1125	* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1126	* - mask passed in arg for lines of interest
1127	* (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1128	* Caller should use TIOCGICOUNT to see which one it was
1129	*/
1130	case TIOCMIWAIT:
1131	local_irq_save(flags);
1132	/* note the counters on entry */
1133	cprev = info->icount;
1134	local_irq_restore(flags);
1135	while (1) {
1136	prepare_to_wait(wq_head: &info->tport.delta_msr_wait,
1137	wq_entry: &wait, TASK_INTERRUPTIBLE);
1138	local_irq_save(flags);
1139	cnow = info->icount; /* atomic copy */
1140	local_irq_restore(flags);
1141	if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1142	cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
1143	ret = -EIO; /* no change => error */
1144	break;
1145	}
1146	if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1147	((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1148	((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1149	((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1150	ret = 0;
1151	break;
1152	}
1153	schedule();
1154	/* see if a signal did it */
1155	if (signal_pending(current)) {
1156	ret = -ERESTARTSYS;
1157	break;
1158	}
1159	cprev = cnow;
1160	}
1161	finish_wait(wq_head: &info->tport.delta_msr_wait, wq_entry: &wait);
1162	return ret;
1163
1164	default:
1165	return -ENOIOCTLCMD;
1166	}
1167	return 0;
1168	}
1169
1170	static void rs_set_termios(struct tty_struct *tty, const struct ktermios *old_termios)
1171	{
1172	struct serial_state *info = tty->driver_data;
1173	unsigned long flags;
1174	unsigned int cflag = tty->termios.c_cflag;
1175
1176	change_speed(tty, info, old_termios);
1177
1178	/* Handle transition to B0 status */
1179	if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) {
1180	info->MCR &= ~(SER_DTR|SER_RTS);
1181	local_irq_save(flags);
1182	rtsdtr_ctrl(bits: info->MCR);
1183	local_irq_restore(flags);
1184	}
1185
1186	/* Handle transition away from B0 status */
1187	if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
1188	info->MCR |= SER_DTR;
1189	if (!C_CRTSCTS(tty) || !tty_throttled(tty))
1190	info->MCR |= SER_RTS;
1191	local_irq_save(flags);
1192	rtsdtr_ctrl(bits: info->MCR);
1193	local_irq_restore(flags);
1194	}
1195
1196	/* Handle turning off CRTSCTS */
1197	if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1198	tty->hw_stopped = false;
1199	rs_start(tty);
1200	}
1201
1202	#if 0
1203	/*
1204	* No need to wake up processes in open wait, since they
1205	* sample the CLOCAL flag once, and don't recheck it.
1206	* XXX It's not clear whether the current behavior is correct
1207	* or not. Hence, this may change.....
1208	*/
1209	if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1210	wake_up_interruptible(&info->open_wait);
1211	#endif
1212	}
1213
1214	/*
1215	* ------------------------------------------------------------
1216	* rs_close()
1217	*
1218	* This routine is called when the serial port gets closed. First, we
1219	* wait for the last remaining data to be sent. Then, we unlink its
1220	* async structure from the interrupt chain if necessary, and we free
1221	* that IRQ if nothing is left in the chain.
1222	* ------------------------------------------------------------
1223	*/
1224	static void rs_close(struct tty_struct *tty, struct file * filp)
1225	{
1226	struct serial_state *state = tty->driver_data;
1227	struct tty_port *port = &state->tport;
1228
1229	if (tty_port_close_start(port, tty, filp) == 0)
1230	return;
1231
1232	/*
1233	* At this point we stop accepting input. To do this, we
1234	* disable the receive line status interrupts, and tell the
1235	* interrupt driver to stop checking the data ready bit in the
1236	* line status register.
1237	*/
1238	state->read_status_mask &= ~UART_LSR_DR;
1239	if (tty_port_initialized(port)) {
1240	/* disable receive interrupts */
1241	amiga_custom.intena = IF_RBF;
1242	mb();
1243	/* clear any pending receive interrupt */
1244	amiga_custom.intreq = IF_RBF;
1245	mb();
1246
1247	/*
1248	* Before we drop DTR, make sure the UART transmitter
1249	* has completely drained; this is especially
1250	* important if there is a transmit FIFO!
1251	*/
1252	rs_wait_until_sent(tty, timeout: state->timeout);
1253	}
1254	shutdown(tty, info: state);
1255	rs_flush_buffer(tty);
1256
1257	tty_ldisc_flush(tty);
1258	port->tty = NULL;
1259
1260	tty_port_close_end(port, tty);
1261	}
1262
1263	/*
1264	* rs_wait_until_sent() --- wait until the transmitter is empty
1265	*/
1266	static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1267	{
1268	struct serial_state *info = tty->driver_data;
1269	unsigned long orig_jiffies, char_time;
1270	int lsr;
1271
1272	orig_jiffies = jiffies;
1273
1274	/*
1275	* Set the check interval to be 1/5 of the estimated time to
1276	* send a single character, and make it at least 1. The check
1277	* interval should also be less than the timeout.
1278	*
1279	* Note: we have to use pretty tight timings here to satisfy
1280	* the NIST-PCTS.
1281	*/
1282	char_time = (info->timeout - HZ/50) / XMIT_FIFO_SIZE;
1283	char_time = char_time / 5;
1284	if (char_time == 0)
1285	char_time = 1;
1286	if (timeout)
1287	char_time = min_t(unsigned long, char_time, timeout);
1288	/*
1289	* If the transmitter hasn't cleared in twice the approximate
1290	* amount of time to send the entire FIFO, it probably won't
1291	* ever clear. This assumes the UART isn't doing flow
1292	* control, which is currently the case. Hence, if it ever
1293	* takes longer than info->timeout, this is probably due to a
1294	* UART bug of some kind. So, we clamp the timeout parameter at
1295	* 2*info->timeout.
1296	*/
1297	if (!timeout || timeout > 2*info->timeout)
1298	timeout = 2*info->timeout;
1299	#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1300	printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1301	printk("jiff=%lu...", jiffies);
1302	#endif
1303	while(!((lsr = amiga_custom.serdatr) & SDR_TSRE)) {
1304	#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1305	printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1306	#endif
1307	msleep_interruptible(msecs: jiffies_to_msecs(j: char_time));
1308	if (signal_pending(current))
1309	break;
1310	if (timeout && time_after(jiffies, orig_jiffies + timeout))
1311	break;
1312	}
1313	__set_current_state(TASK_RUNNING);
1314
1315	#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1316	printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1317	#endif
1318	}
1319
1320	/*
1321	* rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1322	*/
1323	static void rs_hangup(struct tty_struct *tty)
1324	{
1325	struct serial_state *info = tty->driver_data;
1326
1327	rs_flush_buffer(tty);
1328	shutdown(tty, info);
1329	info->tport.count = 0;
1330	tty_port_set_active(port: &info->tport, val: false);
1331	info->tport.tty = NULL;
1332	wake_up_interruptible(&info->tport.open_wait);
1333	}
1334
1335	/*
1336	* This routine is called whenever a serial port is opened. It
1337	* enables interrupts for a serial port, linking in its async structure into
1338	* the IRQ chain. It also performs the serial-specific
1339	* initialization for the tty structure.
1340	*/
1341	static int rs_open(struct tty_struct *tty, struct file * filp)
1342	{
1343	struct tty_port *port = tty->port;
1344	struct serial_state *info = container_of(port, struct serial_state,
1345	tport);
1346	int retval;
1347
1348	port->count++;
1349	port->tty = tty;
1350	tty->driver_data = info;
1351
1352	retval = startup(tty, info);
1353	if (retval) {
1354	return retval;
1355	}
1356
1357	return tty_port_block_til_ready(port, tty, filp);
1358	}
1359
1360	/*
1361	* /proc fs routines....
1362	*/
1363
1364	static inline void line_info(struct seq_file *m, int line,
1365	struct serial_state *state)
1366	{
1367	char stat_buf[30], control, status;
1368	unsigned long flags;
1369
1370	seq_printf(m, fmt: "%d: uart:amiga_builtin", line);
1371
1372	local_irq_save(flags);
1373	status = ciab.pra;
1374	control = tty_port_initialized(port: &state->tport) ? state->MCR : status;
1375	local_irq_restore(flags);
1376
1377	stat_buf[0] = 0;
1378	stat_buf[1] = 0;
1379	if(!(control & SER_RTS))
1380	strcat(p: stat_buf, q: "|RTS");
1381	if(!(status & SER_CTS))
1382	strcat(p: stat_buf, q: "|CTS");
1383	if(!(control & SER_DTR))
1384	strcat(p: stat_buf, q: "|DTR");
1385	if(!(status & SER_DSR))
1386	strcat(p: stat_buf, q: "|DSR");
1387	if(!(status & SER_DCD))
1388	strcat(p: stat_buf, q: "|CD");
1389
1390	if (state->quot)
1391	seq_printf(m, fmt: " baud:%d", state->baud_base / state->quot);
1392
1393	seq_printf(m, fmt: " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1394
1395	if (state->icount.frame)
1396	seq_printf(m, fmt: " fe:%d", state->icount.frame);
1397
1398	if (state->icount.parity)
1399	seq_printf(m, fmt: " pe:%d", state->icount.parity);
1400
1401	if (state->icount.brk)
1402	seq_printf(m, fmt: " brk:%d", state->icount.brk);
1403
1404	if (state->icount.overrun)
1405	seq_printf(m, fmt: " oe:%d", state->icount.overrun);
1406
1407	/*
1408	* Last thing is the RS-232 status lines
1409	*/
1410	seq_printf(m, fmt: " %s\n", stat_buf+1);
1411	}
1412
1413	static int rs_proc_show(struct seq_file *m, void *v)
1414	{
1415	seq_printf(m, fmt: "serinfo:1.0 driver:4.30\n");
1416	line_info(m, line: 0, state: &serial_state);
1417	return 0;
1418	}
1419
1420	/*
1421	* ---------------------------------------------------------------------
1422	* rs_init() and friends
1423	*
1424	* rs_init() is called at boot-time to initialize the serial driver.
1425	* ---------------------------------------------------------------------
1426	*/
1427
1428	static const struct tty_operations serial_ops = {
1429	.open = rs_open,
1430	.close = rs_close,
1431	.write = rs_write,
1432	.put_char = rs_put_char,
1433	.flush_chars = rs_flush_chars,
1434	.write_room = rs_write_room,
1435	.chars_in_buffer = rs_chars_in_buffer,
1436	.flush_buffer = rs_flush_buffer,
1437	.ioctl = rs_ioctl,
1438	.throttle = rs_throttle,
1439	.unthrottle = rs_unthrottle,
1440	.set_termios = rs_set_termios,
1441	.stop = rs_stop,
1442	.start = rs_start,
1443	.hangup = rs_hangup,
1444	.break_ctl = rs_break,
1445	.send_xchar = rs_send_xchar,
1446	.wait_until_sent = rs_wait_until_sent,
1447	.tiocmget = rs_tiocmget,
1448	.tiocmset = rs_tiocmset,
1449	.get_icount = rs_get_icount,
1450	.set_serial = set_serial_info,
1451	.get_serial = get_serial_info,
1452	.proc_show = rs_proc_show,
1453	};
1454
1455	static bool amiga_carrier_raised(struct tty_port *port)
1456	{
1457	return !(ciab.pra & SER_DCD);
1458	}
1459
1460	static void amiga_dtr_rts(struct tty_port *port, bool active)
1461	{
1462	struct serial_state *info = container_of(port, struct serial_state,
1463	tport);
1464	unsigned long flags;
1465
1466	if (active)
1467	info->MCR |= SER_DTR|SER_RTS;
1468	else
1469	info->MCR &= ~(SER_DTR|SER_RTS);
1470
1471	local_irq_save(flags);
1472	rtsdtr_ctrl(bits: info->MCR);
1473	local_irq_restore(flags);
1474	}
1475
1476	static const struct tty_port_operations amiga_port_ops = {
1477	.carrier_raised = amiga_carrier_raised,
1478	.dtr_rts = amiga_dtr_rts,
1479	};
1480
1481	/*
1482	* The serial driver boot-time initialization code!
1483	*/
1484	static int __init amiga_serial_probe(struct platform_device *pdev)
1485	{
1486	struct serial_state *state = &serial_state;
1487	struct tty_driver *driver;
1488	unsigned long flags;
1489	int error;
1490
1491	driver = tty_alloc_driver(1, TTY_DRIVER_REAL_RAW);
1492	if (IS_ERR(ptr: driver))
1493	return PTR_ERR(ptr: driver);
1494
1495	/* Initialize the tty_driver structure */
1496
1497	driver->driver_name = "amiserial";
1498	driver->name = "ttyS";
1499	driver->major = TTY_MAJOR;
1500	driver->minor_start = 64;
1501	driver->type = TTY_DRIVER_TYPE_SERIAL;
1502	driver->subtype = SERIAL_TYPE_NORMAL;
1503	driver->init_termios = tty_std_termios;
1504	driver->init_termios.c_cflag =
1505	B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1506	tty_set_operations(driver, op: &serial_ops);
1507
1508	memset(state, 0, sizeof(*state));
1509	state->port = (int)&amiga_custom.serdatr; /* Just to give it a value */
1510	tty_port_init(port: &state->tport);
1511	state->tport.ops = &amiga_port_ops;
1512	tty_port_link_device(port: &state->tport, driver, index: 0);
1513
1514	error = tty_register_driver(driver);
1515	if (error)
1516	goto fail_tty_driver_kref_put;
1517
1518	printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
1519
1520	/* Hardware set up */
1521
1522	state->baud_base = amiga_colorclock;
1523
1524	/* set ISRs, and then disable the rx interrupts */
1525	error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
1526	if (error)
1527	goto fail_unregister;
1528
1529	error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
1530	"serial RX", state);
1531	if (error)
1532	goto fail_free_irq;
1533
1534	local_irq_save(flags);
1535
1536	/* turn off Rx and Tx interrupts */
1537	amiga_custom.intena = IF_RBF | IF_TBE;
1538	mb();
1539
1540	/* clear any pending interrupt */
1541	amiga_custom.intreq = IF_RBF | IF_TBE;
1542	mb();
1543
1544	local_irq_restore(flags);
1545
1546	/*
1547	* set the appropriate directions for the modem control flags,
1548	* and clear RTS and DTR
1549	*/
1550	ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
1551	ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
1552
1553	platform_set_drvdata(pdev, data: state);
1554
1555	serial_driver = driver;
1556
1557	return 0;
1558
1559	fail_free_irq:
1560	free_irq(IRQ_AMIGA_TBE, state);
1561	fail_unregister:
1562	tty_unregister_driver(driver);
1563	fail_tty_driver_kref_put:
1564	tty_port_destroy(port: &state->tport);
1565	tty_driver_kref_put(driver);
1566	return error;
1567	}
1568
1569	static void __exit amiga_serial_remove(struct platform_device *pdev)
1570	{
1571	struct serial_state *state = platform_get_drvdata(pdev);
1572
1573	tty_unregister_driver(driver: serial_driver);
1574	tty_driver_kref_put(driver: serial_driver);
1575	tty_port_destroy(port: &state->tport);
1576
1577	free_irq(IRQ_AMIGA_TBE, state);
1578	free_irq(IRQ_AMIGA_RBF, state);
1579	}
1580
1581	static struct platform_driver amiga_serial_driver = {
1582	.remove_new = __exit_p(amiga_serial_remove),
1583	.driver = {
1584	.name = "amiga-serial",
1585	},
1586	};
1587
1588	module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe);
1589
1590
1591	#if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1592
1593	/*
1594	* ------------------------------------------------------------
1595	* Serial console driver
1596	* ------------------------------------------------------------
1597	*/
1598
1599	static void amiga_serial_putc(char c)
1600	{
1601	amiga_custom.serdat = (unsigned char)c | 0x100;
1602	while (!(amiga_custom.serdatr & 0x2000))
1603	barrier();
1604	}
1605
1606	/*
1607	* Print a string to the serial port trying not to disturb
1608	* any possible real use of the port...
1609	*
1610	* The console must be locked when we get here.
1611	*/
1612	static void serial_console_write(struct console *co, const char *s,
1613	unsigned count)
1614	{
1615	unsigned short intena = amiga_custom.intenar;
1616
1617	amiga_custom.intena = IF_TBE;
1618
1619	while (count--) {
1620	if (*s == '\n')
1621	amiga_serial_putc('\r');
1622	amiga_serial_putc(*s++);
1623	}
1624
1625	amiga_custom.intena = IF_SETCLR | (intena & IF_TBE);
1626	}
1627
1628	static struct tty_driver *serial_console_device(struct console *c, int *index)
1629	{
1630	*index = 0;
1631	return serial_driver;
1632	}
1633
1634	static struct console sercons = {
1635	.name = "ttyS",
1636	.write = serial_console_write,
1637	.device = serial_console_device,
1638	.flags = CON_PRINTBUFFER,
1639	.index = -1,
1640	};
1641
1642	/*
1643	* Register console.
1644	*/
1645	static int __init amiserial_console_init(void)
1646	{
1647	if (!MACH_IS_AMIGA)
1648	return -ENODEV;
1649
1650	register_console(&sercons);
1651	return 0;
1652	}
1653	console_initcall(amiserial_console_init);
1654
1655	#endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1656
1657	MODULE_LICENSE("GPL");
1658	MODULE_ALIAS("platform:amiga-serial");
1659