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source: GPL/trunk/alsa-kernel/drivers/serial-u16550.c@ 596

Last change on this file since 596 was 587, checked in by David Azarewicz, 9 years ago
Rearrange directory structure rework makefiles cleanup files
File size: 30.9 KB

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1	/*
2	* serial.c
3	* Copyright (c) by Jaroslav Kysela <perex@perex.cz>,
4	* Isaku Yamahata <yamahata@private.email.ne.jp>,
5	* George Hansper <ghansper@apana.org.au>,
6	* Hannu Savolainen
7	*
8	* This code is based on the code from ALSA 0.5.9, but heavily rewritten.
9	*
10	* This program is free software; you can redistribute it and/or modify
11	* it under the terms of the GNU General Public License as published by
12	* the Free Software Foundation; either version 2 of the License, or
13	* (at your option) any later version.
14	*
15	* This program is distributed in the hope that it will be useful,
16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18	* GNU General Public License for more details.
19	*
20	* You should have received a copy of the GNU General Public License
21	* along with this program; if not, write to the Free Software
22	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23	*
24	* Sat Mar 31 17:27:57 PST 2001 tim.mann@compaq.com
25	* Added support for the Midiator MS-124T and for the MS-124W in
26	* Single Addressed (S/A) or Multiple Burst (M/B) mode, with
27	* power derived either parasitically from the serial port or
28	* from a separate power supply.
29	*
30	* More documentation can be found in serial-u16550.txt.
31	*/
32
33	#include <linux/init.h>
34	#include <linux/interrupt.h>
35	#include <linux/err.h>
36	#include <linux/platform_device.h>
37	#include <linux/slab.h>
38	#include <linux/ioport.h>
39	#include <linux/module.h>
40	#include <sound/core.h>
41	#include <sound/rawmidi.h>
42	#include <sound/initval.h>
43
44	#include <linux/serial_reg.h>
45	#include <linux/jiffies.h>
46
47	#include <asm/io.h>
48
49	MODULE_DESCRIPTION("MIDI serial u16550");
50	MODULE_LICENSE("GPL");
51	MODULE_SUPPORTED_DEVICE("{{ALSA, MIDI serial u16550}}");
52
53	#define SNDRV_SERIAL_SOUNDCANVAS 0 /* Roland Soundcanvas; F5 NN selects part */
54	#define SNDRV_SERIAL_MS124T 1 /* Midiator MS-124T */
55	#define SNDRV_SERIAL_MS124W_SA 2 /* Midiator MS-124W in S/A mode */
56	#define SNDRV_SERIAL_MS124W_MB 3 /* Midiator MS-124W in M/B mode */
57	#define SNDRV_SERIAL_GENERIC 4 /* Generic Interface */
58	#define SNDRV_SERIAL_MAX_ADAPTOR SNDRV_SERIAL_GENERIC
59	static char *adaptor_names[] = {
60	"Soundcanvas",
61	"MS-124T",
62	"MS-124W S/A",
63	"MS-124W M/B",
64	"Generic"
65	};
66
67	#define SNDRV_SERIAL_NORMALBUFF 0 /* Normal blocking buffer operation */
68	#define SNDRV_SERIAL_DROPBUFF 1 /* Non-blocking discard operation */
69
70	static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
71	static char id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; / ID for this card */
72	static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE; /* Enable this card */
73	static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT; /* 0x3f8,0x2f8,0x3e8,0x2e8 */
74	static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ; /* 3,4,5,7,9,10,11,14,15 */
75	static int speed[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 38400}; /* 9600,19200,38400,57600,115200 */
76	static int base[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 115200}; /* baud base */
77	static int outs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; /* 1 to 16 */
78	static int ins[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; /* 1 to 16 */
79	static int adaptor[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = SNDRV_SERIAL_SOUNDCANVAS};
80	static bool droponfull[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS -1)] = SNDRV_SERIAL_NORMALBUFF };
81
82	module_param_array(index, int, NULL, 0444);
83	MODULE_PARM_DESC(index, "Index value for Serial MIDI.");
84	module_param_array(id, charp, NULL, 0444);
85	MODULE_PARM_DESC(id, "ID string for Serial MIDI.");
86	module_param_array(enable, bool, NULL, 0444);
87	MODULE_PARM_DESC(enable, "Enable UART16550A chip.");
88	module_param_array(port, long, NULL, 0444);
89	MODULE_PARM_DESC(port, "Port # for UART16550A chip.");
90	module_param_array(irq, int, NULL, 0444);
91	MODULE_PARM_DESC(irq, "IRQ # for UART16550A chip.");
92	module_param_array(speed, int, NULL, 0444);
93	MODULE_PARM_DESC(speed, "Speed in bauds.");
94	module_param_array(base, int, NULL, 0444);
95	MODULE_PARM_DESC(base, "Base for divisor in bauds.");
96	module_param_array(outs, int, NULL, 0444);
97	MODULE_PARM_DESC(outs, "Number of MIDI outputs.");
98	module_param_array(ins, int, NULL, 0444);
99	MODULE_PARM_DESC(ins, "Number of MIDI inputs.");
100	module_param_array(droponfull, bool, NULL, 0444);
101	MODULE_PARM_DESC(droponfull, "Flag to enable drop-on-full buffer mode");
102
103	module_param_array(adaptor, int, NULL, 0444);
104	MODULE_PARM_DESC(adaptor, "Type of adaptor.");
105
106	/#define SNDRV_SERIAL_MS124W_MB_NOCOMBO 1/ /* Address outs as 0-3 instead of bitmap */
107
108	#define SNDRV_SERIAL_MAX_OUTS 16 /* max 64, min 16 */
109	#define SNDRV_SERIAL_MAX_INS 16 /* max 64, min 16 */
110
111	#define TX_BUFF_SIZE (1<<15) /* Must be 2^n */
112	#define TX_BUFF_MASK (TX_BUFF_SIZE - 1)
113
114	#define SERIAL_MODE_NOT_OPENED (0)
115	#define SERIAL_MODE_INPUT_OPEN (1 << 0)
116	#define SERIAL_MODE_OUTPUT_OPEN (1 << 1)
117	#define SERIAL_MODE_INPUT_TRIGGERED (1 << 2)
118	#define SERIAL_MODE_OUTPUT_TRIGGERED (1 << 3)
119
120	struct snd_uart16550 {
121	struct snd_card *card;
122	struct snd_rawmidi *rmidi;
123	struct snd_rawmidi_substream *midi_output[SNDRV_SERIAL_MAX_OUTS];
124	struct snd_rawmidi_substream *midi_input[SNDRV_SERIAL_MAX_INS];
125
126	int filemode; /* open status of file */
127
128	spinlock_t open_lock;
129
130	int irq;
131
132	unsigned long base;
133	struct resource *res_base;
134
135	unsigned int speed;
136	unsigned int speed_base;
137	unsigned char divisor;
138
139	unsigned char old_divisor_lsb;
140	unsigned char old_divisor_msb;
141	unsigned char old_line_ctrl_reg;
142
143	/* parameter for using of write loop */
144	short int fifo_limit; /* used in uart16550 */
145	short int fifo_count; /* used in uart16550 */
146
147	/* type of adaptor */
148	int adaptor;
149
150	/* inputs */
151	int prev_in;
152	unsigned char rstatus;
153
154	/* outputs */
155	int prev_out;
156	unsigned char prev_status[SNDRV_SERIAL_MAX_OUTS];
157
158	/* write buffer and its writing/reading position */
159	unsigned char tx_buff[TX_BUFF_SIZE];
160	int buff_in_count;
161	int buff_in;
162	int buff_out;
163	int drop_on_full;
164
165	/* wait timer */
166	unsigned int timer_running:1;
167	struct timer_list buffer_timer;
168
169	};
170
171	static struct platform_device *devices[SNDRV_CARDS];
172
173	static inline void snd_uart16550_add_timer(struct snd_uart16550 *uart)
174	{
175	if (!uart->timer_running) {
176	/* timer 38600bps * 10bit * 16byte */
177	uart->buffer_timer.expires = jiffies + (HZ+255)/256;
178	uart->timer_running = 1;
179	add_timer(&uart->buffer_timer);
180	}
181	}
182
183	static inline void snd_uart16550_del_timer(struct snd_uart16550 *uart)
184	{
185	if (uart->timer_running) {
186	del_timer(&uart->buffer_timer);
187	uart->timer_running = 0;
188	}
189	}
190
191	/* This macro is only used in snd_uart16550_io_loop */
192	static inline void snd_uart16550_buffer_output(struct snd_uart16550 *uart)
193	{
194	unsigned short buff_out = uart->buff_out;
195	if (uart->buff_in_count > 0) {
196	outb(uart->tx_buff[buff_out], uart->base + UART_TX);
197	uart->fifo_count++;
198	buff_out++;
199	buff_out &= TX_BUFF_MASK;
200	uart->buff_out = buff_out;
201	uart->buff_in_count--;
202	}
203	}
204
205	/* This loop should be called with interrupts disabled
206	* We don't want to interrupt this,
207	* as we're already handling an interrupt
208	*/
209	static void snd_uart16550_io_loop(struct snd_uart16550 * uart)
210	{
211	unsigned char c, status;
212	int substream;
213
214	/* recall previous stream */
215	substream = uart->prev_in;
216
217	/* Read Loop */
218	while ((status = inb(uart->base + UART_LSR)) & UART_LSR_DR) {
219	/* while receive data ready */
220	c = inb(uart->base + UART_RX);
221
222	/* keep track of last status byte */
223	if (c & 0x80)
224	uart->rstatus = c;
225
226	/* handle stream switch */
227	if (uart->adaptor == SNDRV_SERIAL_GENERIC) {
228	if (uart->rstatus == 0xf5) {
229	if (c <= SNDRV_SERIAL_MAX_INS && c > 0)
230	substream = c - 1;
231	if (c != 0xf5)
232	/* prevent future bytes from being
233	interpreted as streams */
234	uart->rstatus = 0;
235	} else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN)
236	&& uart->midi_input[substream])
237	snd_rawmidi_receive(uart->midi_input[substream],
238	&c, 1);
239	} else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN) &&
240	uart->midi_input[substream])
241	snd_rawmidi_receive(uart->midi_input[substream], &c, 1);
242
243	if (status & UART_LSR_OE)
244	snd_printk(KERN_WARNING
245	"%s: Overrun on device at 0x%lx\n",
246	uart->rmidi->name, uart->base);
247	}
248
249	/* remember the last stream */
250	uart->prev_in = substream;
251
252	/* no need of check SERIAL_MODE_OUTPUT_OPEN because if not,
253	buffer is never filled. */
254	/* Check write status */
255	if (status & UART_LSR_THRE)
256	uart->fifo_count = 0;
257	if (uart->adaptor == SNDRV_SERIAL_MS124W_SA
258	\|\| uart->adaptor == SNDRV_SERIAL_GENERIC) {
259	/* Can't use FIFO, must send only when CTS is true */
260	status = inb(uart->base + UART_MSR);
261	while (uart->fifo_count == 0 && (status & UART_MSR_CTS) &&
262	uart->buff_in_count > 0) {
263	snd_uart16550_buffer_output(uart);
264	status = inb(uart->base + UART_MSR);
265	}
266	} else {
267	/* Write loop */
268	while (uart->fifo_count < uart->fifo_limit /* Can we write ? */
269	&& uart->buff_in_count > 0) /* Do we want to? */
270	snd_uart16550_buffer_output(uart);
271	}
272	if (uart->irq < 0 && uart->buff_in_count > 0)
273	snd_uart16550_add_timer(uart);
274	}
275
276	/* NOTES ON SERVICING INTERUPTS
277	* ---------------------------
278	* After receiving a interrupt, it is important to indicate to the UART that
279	* this has been done.
280	* For a Rx interrupt, this is done by reading the received byte.
281	* For a Tx interrupt this is done by either:
282	* a) Writing a byte
283	* b) Reading the IIR
284	* It is particularly important to read the IIR if a Tx interrupt is received
285	* when there is no data in tx_buff[], as in this case there no other
286	* indication that the interrupt has been serviced, and it remains outstanding
287	* indefinitely. This has the curious side effect that and no further interrupts
288	* will be generated from this device AT ALL!!.
289	* It is also desirable to clear outstanding interrupts when the device is
290	* opened/closed.
291	*
292	*
293	* Note that some devices need OUT2 to be set before they will generate
294	* interrupts at all. (Possibly tied to an internal pull-up on CTS?)
295	*/
296	static irqreturn_t snd_uart16550_interrupt(int irq, void *dev_id)
297	{
298	struct snd_uart16550 *uart;
299
300	uart = dev_id;
301	spin_lock(&uart->open_lock);
302	if (uart->filemode == SERIAL_MODE_NOT_OPENED) {
303	spin_unlock(&uart->open_lock);
304	return IRQ_NONE;
305	}
306	/* indicate to the UART that the interrupt has been serviced */
307	inb(uart->base + UART_IIR);
308	snd_uart16550_io_loop(uart);
309	spin_unlock(&uart->open_lock);
310	return IRQ_HANDLED;
311	}
312
313	/* When the polling mode, this function calls snd_uart16550_io_loop. */
314	static void snd_uart16550_buffer_timer(unsigned long data)
315	{
316	unsigned long flags;
317	struct snd_uart16550 *uart;
318
319	uart = (struct snd_uart16550 *)data;
320	spin_lock_irqsave(&uart->open_lock, flags);
321	snd_uart16550_del_timer(uart);
322	snd_uart16550_io_loop(uart);
323	spin_unlock_irqrestore(&uart->open_lock, flags);
324	}
325
326	/*
327	* this method probes, if an uart sits on given port
328	* return 0 if found
329	* return negative error if not found
330	*/
331	static int __devinit snd_uart16550_detect(struct snd_uart16550 *uart)
332	{
333	unsigned long io_base = uart->base;
334	int ok;
335	unsigned char c;
336
337	/* Do some vague tests for the presence of the uart */
338	if (io_base == 0 \|\| io_base == SNDRV_AUTO_PORT) {
339	return -ENODEV; /* Not configured */
340	}
341
342	uart->res_base = request_region(io_base, 8, "Serial MIDI");
343	if (uart->res_base == NULL) {
344	snd_printk(KERN_ERR "u16550: can't grab port 0x%lx\n", io_base);
345	return -EBUSY;
346	}
347
348	/* uart detected unless one of the following tests should fail */
349	ok = 1;
350	/* 8 data-bits, 1 stop-bit, parity off, DLAB = 0 */
351	outb(UART_LCR_WLEN8, io_base + UART_LCR); /* Line Control Register */
352	c = inb(io_base + UART_IER);
353	/* The top four bits of the IER should always == 0 */
354	if ((c & 0xf0) != 0)
355	ok = 0; /* failed */
356
357	outb(0xaa, io_base + UART_SCR);
358	/* Write arbitrary data into the scratch reg */
359	c = inb(io_base + UART_SCR);
360	/* If it comes back, it's OK */
361	if (c != 0xaa)
362	ok = 0; /* failed */
363
364	outb(0x55, io_base + UART_SCR);
365	/* Write arbitrary data into the scratch reg */
366	c = inb(io_base + UART_SCR);
367	/* If it comes back, it's OK */
368	if (c != 0x55)
369	ok = 0; /* failed */
370
371	return ok;
372	}
373
374	static void snd_uart16550_do_open(struct snd_uart16550 * uart)
375	{
376	char byte;
377
378	/* Initialize basic variables */
379	uart->buff_in_count = 0;
380	uart->buff_in = 0;
381	uart->buff_out = 0;
382	uart->fifo_limit = 1;
383	uart->fifo_count = 0;
384	uart->timer_running = 0;
385
386	outb(UART_FCR_ENABLE_FIFO /* Enable FIFO's (if available) */
387	\| UART_FCR_CLEAR_RCVR /* Clear receiver FIFO */
388	\| UART_FCR_CLEAR_XMIT /* Clear transmitter FIFO */
389	\| UART_FCR_TRIGGER_4 /* Set FIFO trigger at 4-bytes */
390	/* NOTE: interrupt generated after T=(time)4-bytes
391	* if less than UART_FCR_TRIGGER bytes received
392	*/
393	,uart->base + UART_FCR); /* FIFO Control Register */
394
395	if ((inb(uart->base + UART_IIR) & 0xf0) == 0xc0)
396	uart->fifo_limit = 16;
397	if (uart->divisor != 0) {
398	uart->old_line_ctrl_reg = inb(uart->base + UART_LCR);
399	outb(UART_LCR_DLAB /* Divisor latch access bit */
400	,uart->base + UART_LCR); /* Line Control Register */
401	uart->old_divisor_lsb = inb(uart->base + UART_DLL);
402	uart->old_divisor_msb = inb(uart->base + UART_DLM);
403
404	outb(uart->divisor
405	,uart->base + UART_DLL); /* Divisor Latch Low */
406	outb(0
407	,uart->base + UART_DLM); /* Divisor Latch High */
408	/* DLAB is reset to 0 in next outb() */
409	}
410	/* Set serial parameters (parity off, etc) */
411	outb(UART_LCR_WLEN8 /* 8 data-bits */
412	\| 0 /* 1 stop-bit */
413	\| 0 /* parity off */
414	\| 0 /* DLAB = 0 */
415	,uart->base + UART_LCR); /* Line Control Register */
416
417	switch (uart->adaptor) {
418	default:
419	outb(UART_MCR_RTS /* Set Request-To-Send line active */
420	\| UART_MCR_DTR /* Set Data-Terminal-Ready line active */
421	\| UART_MCR_OUT2 /* Set OUT2 - not always required, but when
422	* it is, it is ESSENTIAL for enabling interrupts
423	*/
424	,uart->base + UART_MCR); /* Modem Control Register */
425	break;
426	case SNDRV_SERIAL_MS124W_SA:
427	case SNDRV_SERIAL_MS124W_MB:
428	/* MS-124W can draw power from RTS and DTR if they
429	are in opposite states. */
430	outb(UART_MCR_RTS \| (0&UART_MCR_DTR) \| UART_MCR_OUT2,
431	uart->base + UART_MCR);
432	break;
433	case SNDRV_SERIAL_MS124T:
434	/* MS-124T can draw power from RTS and/or DTR (preferably
435	both) if they are both asserted. */
436	outb(UART_MCR_RTS \| UART_MCR_DTR \| UART_MCR_OUT2,
437	uart->base + UART_MCR);
438	break;
439	}
440
441	if (uart->irq < 0) {
442	byte = (0 & UART_IER_RDI) /* Disable Receiver data interrupt */
443	\|(0 & UART_IER_THRI) /* Disable Transmitter holding register empty interrupt */
444	;
445	} else if (uart->adaptor == SNDRV_SERIAL_MS124W_SA) {
446	byte = UART_IER_RDI /* Enable Receiver data interrupt */
447	\| UART_IER_MSI /* Enable Modem status interrupt */
448	;
449	} else if (uart->adaptor == SNDRV_SERIAL_GENERIC) {
450	byte = UART_IER_RDI /* Enable Receiver data interrupt */
451	\| UART_IER_MSI /* Enable Modem status interrupt */
452	\| UART_IER_THRI /* Enable Transmitter holding register empty interrupt */
453	;
454	} else {
455	byte = UART_IER_RDI /* Enable Receiver data interrupt */
456	\| UART_IER_THRI /* Enable Transmitter holding register empty interrupt */
457	;
458	}
459	outb(byte, uart->base + UART_IER); /* Interrupt enable Register */
460
461	inb(uart->base + UART_LSR); /* Clear any pre-existing overrun indication */
462	inb(uart->base + UART_IIR); /* Clear any pre-existing transmit interrupt */
463	inb(uart->base + UART_RX); /* Clear any pre-existing receive interrupt */
464	}
465
466	static void snd_uart16550_do_close(struct snd_uart16550 * uart)
467	{
468	if (uart->irq < 0)
469	snd_uart16550_del_timer(uart);
470
471	/* NOTE: may need to disable interrupts before de-registering out handler.
472	* For now, the consequences are harmless.
473	*/
474
475	outb((0 & UART_IER_RDI) /* Disable Receiver data interrupt */
476	\|(0 & UART_IER_THRI) /* Disable Transmitter holding register empty interrupt */
477	,uart->base + UART_IER); /* Interrupt enable Register */
478
479	switch (uart->adaptor) {
480	default:
481	outb((0 & UART_MCR_RTS) /* Deactivate Request-To-Send line */
482	\|(0 & UART_MCR_DTR) /* Deactivate Data-Terminal-Ready line */
483	\|(0 & UART_MCR_OUT2) /* Deactivate OUT2 */
484	,uart->base + UART_MCR); /* Modem Control Register */
485	break;
486	case SNDRV_SERIAL_MS124W_SA:
487	case SNDRV_SERIAL_MS124W_MB:
488	/* MS-124W can draw power from RTS and DTR if they
489	are in opposite states; leave it powered. */
490	outb(UART_MCR_RTS \| (0&UART_MCR_DTR) \| (0&UART_MCR_OUT2),
491	uart->base + UART_MCR);
492	break;
493	case SNDRV_SERIAL_MS124T:
494	/* MS-124T can draw power from RTS and/or DTR (preferably
495	both) if they are both asserted; leave it powered. */
496	outb(UART_MCR_RTS \| UART_MCR_DTR \| (0&UART_MCR_OUT2),
497	uart->base + UART_MCR);
498	break;
499	}
500
501	inb(uart->base + UART_IIR); /* Clear any outstanding interrupts */
502
503	/* Restore old divisor */
504	if (uart->divisor != 0) {
505	outb(UART_LCR_DLAB /* Divisor latch access bit */
506	,uart->base + UART_LCR); /* Line Control Register */
507	outb(uart->old_divisor_lsb
508	,uart->base + UART_DLL); /* Divisor Latch Low */
509	outb(uart->old_divisor_msb
510	,uart->base + UART_DLM); /* Divisor Latch High */
511	/* Restore old LCR (data bits, stop bits, parity, DLAB) */
512	outb(uart->old_line_ctrl_reg
513	,uart->base + UART_LCR); /* Line Control Register */
514	}
515	}
516
517	static int snd_uart16550_input_open(struct snd_rawmidi_substream *substream)
518	{
519	unsigned long flags;
520	struct snd_uart16550 *uart = substream->rmidi->private_data;
521
522	spin_lock_irqsave(&uart->open_lock, flags);
523	if (uart->filemode == SERIAL_MODE_NOT_OPENED)
524	snd_uart16550_do_open(uart);
525	uart->filemode \|= SERIAL_MODE_INPUT_OPEN;
526	uart->midi_input[substream->number] = substream;
527	spin_unlock_irqrestore(&uart->open_lock, flags);
528	return 0;
529	}
530
531	static int snd_uart16550_input_close(struct snd_rawmidi_substream *substream)
532	{
533	unsigned long flags;
534	struct snd_uart16550 *uart = substream->rmidi->private_data;
535
536	spin_lock_irqsave(&uart->open_lock, flags);
537	uart->filemode &= ~SERIAL_MODE_INPUT_OPEN;
538	uart->midi_input[substream->number] = NULL;
539	if (uart->filemode == SERIAL_MODE_NOT_OPENED)
540	snd_uart16550_do_close(uart);
541	spin_unlock_irqrestore(&uart->open_lock, flags);
542	return 0;
543	}
544
545	static void snd_uart16550_input_trigger(struct snd_rawmidi_substream *substream,
546	int up)
547	{
548	unsigned long flags;
549	struct snd_uart16550 *uart = substream->rmidi->private_data;
550
551	spin_lock_irqsave(&uart->open_lock, flags);
552	if (up)
553	uart->filemode \|= SERIAL_MODE_INPUT_TRIGGERED;
554	else
555	uart->filemode &= ~SERIAL_MODE_INPUT_TRIGGERED;
556	spin_unlock_irqrestore(&uart->open_lock, flags);
557	}
558
559	static int snd_uart16550_output_open(struct snd_rawmidi_substream *substream)
560	{
561	unsigned long flags;
562	struct snd_uart16550 *uart = substream->rmidi->private_data;
563
564	spin_lock_irqsave(&uart->open_lock, flags);
565	if (uart->filemode == SERIAL_MODE_NOT_OPENED)
566	snd_uart16550_do_open(uart);
567	uart->filemode \|= SERIAL_MODE_OUTPUT_OPEN;
568	uart->midi_output[substream->number] = substream;
569	spin_unlock_irqrestore(&uart->open_lock, flags);
570	return 0;
571	};
572
573	static int snd_uart16550_output_close(struct snd_rawmidi_substream *substream)
574	{
575	unsigned long flags;
576	struct snd_uart16550 *uart = substream->rmidi->private_data;
577
578	spin_lock_irqsave(&uart->open_lock, flags);
579	uart->filemode &= ~SERIAL_MODE_OUTPUT_OPEN;
580	uart->midi_output[substream->number] = NULL;
581	if (uart->filemode == SERIAL_MODE_NOT_OPENED)
582	snd_uart16550_do_close(uart);
583	spin_unlock_irqrestore(&uart->open_lock, flags);
584	return 0;
585	};
586
587	static inline int snd_uart16550_buffer_can_write(struct snd_uart16550 *uart,
588	int Num)
589	{
590	if (uart->buff_in_count + Num < TX_BUFF_SIZE)
591	return 1;
592	else
593	return 0;
594	}
595
596	static inline int snd_uart16550_write_buffer(struct snd_uart16550 *uart,
597	unsigned char byte)
598	{
599	unsigned short buff_in = uart->buff_in;
600	if (uart->buff_in_count < TX_BUFF_SIZE) {
601	uart->tx_buff[buff_in] = byte;
602	buff_in++;
603	buff_in &= TX_BUFF_MASK;
604	uart->buff_in = buff_in;
605	uart->buff_in_count++;
606	if (uart->irq < 0) /* polling mode */
607	snd_uart16550_add_timer(uart);
608	return 1;
609	} else
610	return 0;
611	}
612
613	static int snd_uart16550_output_byte(struct snd_uart16550 *uart,
614	struct snd_rawmidi_substream *substream,
615	unsigned char midi_byte)
616	{
617	if (uart->buff_in_count == 0 /* Buffer empty? */
618	&& ((uart->adaptor != SNDRV_SERIAL_MS124W_SA &&
619	uart->adaptor != SNDRV_SERIAL_GENERIC) \|\|
620	(uart->fifo_count == 0 /* FIFO empty? */
621	&& (inb(uart->base + UART_MSR) & UART_MSR_CTS)))) { /* CTS? */
622
623	/* Tx Buffer Empty - try to write immediately */
624	if ((inb(uart->base + UART_LSR) & UART_LSR_THRE) != 0) {
625	/* Transmitter holding register (and Tx FIFO) empty */
626	uart->fifo_count = 1;
627	outb(midi_byte, uart->base + UART_TX);
628	} else {
629	if (uart->fifo_count < uart->fifo_limit) {
630	uart->fifo_count++;
631	outb(midi_byte, uart->base + UART_TX);
632	} else {
633	/* Cannot write (buffer empty) -
634	* put char in buffer */
635	snd_uart16550_write_buffer(uart, midi_byte);
636	}
637	}
638	} else {
639	if (!snd_uart16550_write_buffer(uart, midi_byte)) {
640	snd_printk(KERN_WARNING
641	"%s: Buffer overrun on device at 0x%lx\n",
642	uart->rmidi->name, uart->base);
643	return 0;
644	}
645	}
646
647	return 1;
648	}
649
650	static void snd_uart16550_output_write(struct snd_rawmidi_substream *substream)
651	{
652	unsigned long flags;
653	unsigned char midi_byte, addr_byte;
654	struct snd_uart16550 *uart = substream->rmidi->private_data;
655	char first;
656	static unsigned long lasttime = 0;
657
658	/* Interrupts are disabled during the updating of the tx_buff,
659	* since it is 'bad' to have two processes updating the same
660	* variables (ie buff_in & buff_out)
661	*/
662
663	spin_lock_irqsave(&uart->open_lock, flags);
664
665	if (uart->irq < 0) /* polling */
666	snd_uart16550_io_loop(uart);
667
668	if (uart->adaptor == SNDRV_SERIAL_MS124W_MB) {
669	while (1) {
670	/* buffer full? */
671	/* in this mode we need two bytes of space */
672	if (uart->buff_in_count > TX_BUFF_SIZE - 2)
673	break;
674	if (snd_rawmidi_transmit(substream, &midi_byte, 1) != 1)
675	break;
676	#ifdef SNDRV_SERIAL_MS124W_MB_NOCOMBO
677	/* select exactly one of the four ports */
678	addr_byte = (1 << (substream->number + 4)) \| 0x08;
679	#else
680	/* select any combination of the four ports */
681	addr_byte = (substream->number << 4) \| 0x08;
682	/* ...except none */
683	if (addr_byte == 0x08)
684	addr_byte = 0xf8;
685	#endif
686	snd_uart16550_output_byte(uart, substream, addr_byte);
687	/* send midi byte */
688	snd_uart16550_output_byte(uart, substream, midi_byte);
689	}
690	} else {
691	first = 0;
692	while (snd_rawmidi_transmit_peek(substream, &midi_byte, 1) == 1) {
693	/* Also send F5 after 3 seconds with no data
694	* to handle device disconnect */
695	if (first == 0 &&
696	(uart->adaptor == SNDRV_SERIAL_SOUNDCANVAS \|\|
697	uart->adaptor == SNDRV_SERIAL_GENERIC) &&
698	(uart->prev_out != substream->number \|\|
699	time_after(jiffies, lasttime + 3*HZ))) {
700
701	if (snd_uart16550_buffer_can_write(uart, 3)) {
702	/* Roland Soundcanvas part selection */
703	/* If this substream of the data is
704	* different previous substream
705	* in this uart, send the change part
706	* event
707	*/
708	uart->prev_out = substream->number;
709	/* change part */
710	snd_uart16550_output_byte(uart, substream,
711	0xf5);
712	/* data */
713	snd_uart16550_output_byte(uart, substream,
714	uart->prev_out + 1);
715	/* If midi_byte is a data byte,
716	* send the previous status byte */
717	if (midi_byte < 0x80 &&
718	uart->adaptor == SNDRV_SERIAL_SOUNDCANVAS)
719	snd_uart16550_output_byte(uart, substream, uart->prev_status[uart->prev_out]);
720	} else if (!uart->drop_on_full)
721	break;
722
723	}
724
725	/* send midi byte */
726	if (!snd_uart16550_output_byte(uart, substream, midi_byte) &&
727	!uart->drop_on_full )
728	break;
729
730	if (midi_byte >= 0x80 && midi_byte < 0xf0)
731	uart->prev_status[uart->prev_out] = midi_byte;
732	first = 1;
733
734	snd_rawmidi_transmit_ack( substream, 1 );
735	}
736	lasttime = jiffies;
737	}
738	spin_unlock_irqrestore(&uart->open_lock, flags);
739	}
740
741	static void snd_uart16550_output_trigger(struct snd_rawmidi_substream *substream,
742	int up)
743	{
744	unsigned long flags;
745	struct snd_uart16550 *uart = substream->rmidi->private_data;
746
747	spin_lock_irqsave(&uart->open_lock, flags);
748	if (up)
749	uart->filemode \|= SERIAL_MODE_OUTPUT_TRIGGERED;
750	else
751	uart->filemode &= ~SERIAL_MODE_OUTPUT_TRIGGERED;
752	spin_unlock_irqrestore(&uart->open_lock, flags);
753	if (up)
754	snd_uart16550_output_write(substream);
755	}
756
757	static struct snd_rawmidi_ops snd_uart16550_output =
758	{
759	.open = snd_uart16550_output_open,
760	.close = snd_uart16550_output_close,
761	.trigger = snd_uart16550_output_trigger,
762	};
763
764	static struct snd_rawmidi_ops snd_uart16550_input =
765	{
766	.open = snd_uart16550_input_open,
767	.close = snd_uart16550_input_close,
768	.trigger = snd_uart16550_input_trigger,
769	};
770
771	static int snd_uart16550_free(struct snd_uart16550 *uart)
772	{
773	if (uart->irq >= 0)
774	free_irq(uart->irq, uart);
775	release_and_free_resource(uart->res_base);
776	kfree(uart);
777	return 0;
778	};
779
780	static int snd_uart16550_dev_free(struct snd_device *device)
781	{
782	struct snd_uart16550 *uart = device->device_data;
783	return snd_uart16550_free(uart);
784	}
785
786	static int __devinit snd_uart16550_create(struct snd_card *card,
787	unsigned long iobase,
788	int irq,
789	unsigned int speed,
790	unsigned int base,
791	int adaptor,
792	int droponfull,
793	struct snd_uart16550 **ruart)
794	{
795	static struct snd_device_ops ops = {
796	.dev_free = snd_uart16550_dev_free,
797	};
798	struct snd_uart16550 *uart;
799	int err;
800
801
802	if ((uart = kzalloc(sizeof(*uart), GFP_KERNEL)) == NULL)
803	return -ENOMEM;
804	uart->adaptor = adaptor;
805	uart->card = card;
806	spin_lock_init(&uart->open_lock);
807	uart->irq = -1;
808	uart->base = iobase;
809	uart->drop_on_full = droponfull;
810
811	if ((err = snd_uart16550_detect(uart)) <= 0) {
812	printk(KERN_ERR "no UART detected at 0x%lx\n", iobase);
813	snd_uart16550_free(uart);
814	return -ENODEV;
815	}
816
817	if (irq >= 0 && irq != SNDRV_AUTO_IRQ) {
818	if (request_irq(irq, snd_uart16550_interrupt,
819	0, "Serial MIDI", uart)) {
820	snd_printk(KERN_WARNING
821	"irq %d busy. Using Polling.\n", irq);
822	} else {
823	uart->irq = irq;
824	}
825	}
826	uart->divisor = base / speed;
827	uart->speed = base / (unsigned int)uart->divisor;
828	uart->speed_base = base;
829	uart->prev_out = -1;
830	uart->prev_in = 0;
831	uart->rstatus = 0;
832	memset(uart->prev_status, 0x80, sizeof(unsigned char) * SNDRV_SERIAL_MAX_OUTS);
833	init_timer(&uart->buffer_timer);
834	uart->buffer_timer.function = snd_uart16550_buffer_timer;
835	uart->buffer_timer.data = (unsigned long)uart;
836	uart->timer_running = 0;
837
838	/* Register device */
839	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, uart, &ops)) < 0) {
840	snd_uart16550_free(uart);
841	return err;
842	}
843
844	switch (uart->adaptor) {
845	case SNDRV_SERIAL_MS124W_SA:
846	case SNDRV_SERIAL_MS124W_MB:
847	/* MS-124W can draw power from RTS and DTR if they
848	are in opposite states. */
849	outb(UART_MCR_RTS \| (0&UART_MCR_DTR), uart->base + UART_MCR);
850	break;
851	case SNDRV_SERIAL_MS124T:
852	/* MS-124T can draw power from RTS and/or DTR (preferably
853	both) if they are asserted. */
854	outb(UART_MCR_RTS \| UART_MCR_DTR, uart->base + UART_MCR);
855	break;
856	default:
857	break;
858	}
859
860	if (ruart)
861	*ruart = uart;
862
863	return 0;
864	}
865
866	static void __devinit snd_uart16550_substreams(struct snd_rawmidi_str *stream)
867	{
868	struct snd_rawmidi_substream *substream;
869
870	list_for_each_entry(substream, &stream->substreams, list) {
871	sprintf(substream->name, "Serial MIDI %d", substream->number + 1);
872	}
873	}
874
875	static int __devinit snd_uart16550_rmidi(struct snd_uart16550 *uart, int device,
876	int outs, int ins,
877	struct snd_rawmidi **rmidi)
878	{
879	struct snd_rawmidi *rrawmidi;
880	int err;
881
882	err = snd_rawmidi_new(uart->card, "UART Serial MIDI", device,
883	outs, ins, &rrawmidi);
884	if (err < 0)
885	return err;
886	snd_rawmidi_set_ops(rrawmidi, SNDRV_RAWMIDI_STREAM_INPUT,
887	&snd_uart16550_input);
888	snd_rawmidi_set_ops(rrawmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
889	&snd_uart16550_output);
890	strcpy(rrawmidi->name, "Serial MIDI");
891	snd_uart16550_substreams(&rrawmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
892	snd_uart16550_substreams(&rrawmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
893	rrawmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT \|
894	SNDRV_RAWMIDI_INFO_INPUT \|
895	SNDRV_RAWMIDI_INFO_DUPLEX;
896	rrawmidi->private_data = uart;
897	if (rmidi)
898	*rmidi = rrawmidi;
899	return 0;
900	}
901
902	static int __devinit snd_serial_probe(struct platform_device *devptr)
903	{
904	struct snd_card *card;
905	struct snd_uart16550 *uart;
906	int err;
907	int dev = devptr->id;
908
909	switch (adaptor[dev]) {
910	case SNDRV_SERIAL_SOUNDCANVAS:
911	ins[dev] = 1;
912	break;
913	case SNDRV_SERIAL_MS124T:
914	case SNDRV_SERIAL_MS124W_SA:
915	outs[dev] = 1;
916	ins[dev] = 1;
917	break;
918	case SNDRV_SERIAL_MS124W_MB:
919	outs[dev] = 16;
920	ins[dev] = 1;
921	break;
922	case SNDRV_SERIAL_GENERIC:
923	break;
924	default:
925	snd_printk(KERN_ERR
926	"Adaptor type is out of range 0-%d (%d)\n",
927	SNDRV_SERIAL_MAX_ADAPTOR, adaptor[dev]);
928	return -ENODEV;
929	}
930
931	if (outs[dev] < 1 \|\| outs[dev] > SNDRV_SERIAL_MAX_OUTS) {
932	snd_printk(KERN_ERR
933	"Count of outputs is out of range 1-%d (%d)\n",
934	SNDRV_SERIAL_MAX_OUTS, outs[dev]);
935	return -ENODEV;
936	}
937
938	if (ins[dev] < 1 \|\| ins[dev] > SNDRV_SERIAL_MAX_INS) {
939	snd_printk(KERN_ERR
940	"Count of inputs is out of range 1-%d (%d)\n",
941	SNDRV_SERIAL_MAX_INS, ins[dev]);
942	return -ENODEV;
943	}
944
945	err = snd_card_create(index[dev], id[dev], THIS_MODULE, 0, &card);
946	if (err < 0)
947	return err;
948
949	strcpy(card->driver, "Serial");
950	strcpy(card->shortname, "Serial MIDI (UART16550A)");
951
952	if ((err = snd_uart16550_create(card,
953	port[dev],
954	irq[dev],
955	speed[dev],
956	base[dev],
957	adaptor[dev],
958	droponfull[dev],
959	&uart)) < 0)
960	goto _err;
961
962	err = snd_uart16550_rmidi(uart, 0, outs[dev], ins[dev], &uart->rmidi);
963	if (err < 0)
964	goto _err;
965
966	sprintf(card->longname, "%s [%s] at %#lx, irq %d",
967	card->shortname,
968	adaptor_names[uart->adaptor],
969	uart->base,
970	uart->irq);
971
972	snd_card_set_dev(card, &devptr->dev);
973
974	if ((err = snd_card_register(card)) < 0)
975	goto _err;
976
977	platform_set_drvdata(devptr, card);
978	return 0;
979
980	_err:
981	snd_card_free(card);
982	return err;
983	}
984
985	static int __devexit snd_serial_remove(struct platform_device *devptr)
986	{
987	snd_card_free(platform_get_drvdata(devptr));
988	platform_set_drvdata(devptr, NULL);
989	return 0;
990	}
991
992	#define SND_SERIAL_DRIVER "snd_serial_u16550"
993
994	static struct platform_driver snd_serial_driver = {
995	.probe = snd_serial_probe,
996	.remove = __devexit_p( snd_serial_remove),
997	.driver = {
998	.name = SND_SERIAL_DRIVER
999	},
1000	};
1001
1002	static void snd_serial_unregister_all(void)
1003	{
1004	int i;
1005
1006	for (i = 0; i < ARRAY_SIZE(devices); ++i)
1007	platform_device_unregister(devices[i]);
1008	platform_driver_unregister(&snd_serial_driver);
1009	}
1010
1011	static int __init alsa_card_serial_init(void)
1012	{
1013	int i, cards, err;
1014
1015	if ((err = platform_driver_register(&snd_serial_driver)) < 0)
1016	return err;
1017
1018	cards = 0;
1019	for (i = 0; i < SNDRV_CARDS; i++) {
1020	struct platform_device *device;
1021	if (! enable[i])
1022	continue;
1023	device = platform_device_register_simple(SND_SERIAL_DRIVER,
1024	i, NULL, 0);
1025	if (IS_ERR(device))
1026	continue;
1027	if (!platform_get_drvdata(device)) {
1028	platform_device_unregister(device);
1029	continue;
1030	}
1031	devices[i] = device;
1032	cards++;
1033	}
1034	if (! cards) {
1035	#ifdef MODULE
1036	printk(KERN_ERR "serial midi soundcard not found or device busy\n");
1037	#endif
1038	snd_serial_unregister_all();
1039	return -ENODEV;
1040	}
1041	return 0;
1042	}
1043
1044	static void __exit alsa_card_serial_exit(void)
1045	{
1046	snd_serial_unregister_all();
1047	}
1048
1049	module_init(alsa_card_serial_init)
1050	module_exit(alsa_card_serial_exit)

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