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source: GPL/trunk/alsa-kernel/drivers/serial-u16550.c@ 682

Last change on this file since 682 was 679, checked in by David Azarewicz, 5 years ago
Merge changes from Paul's uniaud32next branch.
File size: 30.0 KB

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1	// SPDX-License-Identifier: GPL-2.0-or-later
2	/*
3	* serial.c
4	* Copyright (c) by Jaroslav Kysela <perex@perex.cz>,
5	* Isaku Yamahata <yamahata@private.email.ne.jp>,
6	* George Hansper <ghansper@apana.org.au>,
7	* Hannu Savolainen
8	*
9	* This code is based on the code from ALSA 0.5.9, but heavily rewritten.
10	*
11	* Sat Mar 31 17:27:57 PST 2001 tim.mann@compaq.com
12	* Added support for the Midiator MS-124T and for the MS-124W in
13	* Single Addressed (S/A) or Multiple Burst (M/B) mode, with
14	* power derived either parasitically from the serial port or
15	* from a separate power supply.
16	*
17	* More documentation can be found in serial-u16550.txt.
18	*/
19
20	#include <linux/init.h>
21	#include <linux/interrupt.h>
22	#include <linux/err.h>
23	#include <linux/platform_device.h>
24	#include <linux/slab.h>
25	#include <linux/ioport.h>
26	#include <linux/module.h>
27	#include <linux/io.h>
28	#include <sound/core.h>
29	#include <sound/rawmidi.h>
30	#include <sound/initval.h>
31
32	#include <linux/serial_reg.h>
33	#include <linux/jiffies.h>
34
35	MODULE_DESCRIPTION("MIDI serial u16550");
36	MODULE_LICENSE("GPL");
37	MODULE_SUPPORTED_DEVICE("{{ALSA, MIDI serial u16550}}");
38
39	#define SNDRV_SERIAL_SOUNDCANVAS 0 /* Roland Soundcanvas; F5 NN selects part */
40	#define SNDRV_SERIAL_MS124T 1 /* Midiator MS-124T */
41	#define SNDRV_SERIAL_MS124W_SA 2 /* Midiator MS-124W in S/A mode */
42	#define SNDRV_SERIAL_MS124W_MB 3 /* Midiator MS-124W in M/B mode */
43	#define SNDRV_SERIAL_GENERIC 4 /* Generic Interface */
44	#define SNDRV_SERIAL_MAX_ADAPTOR SNDRV_SERIAL_GENERIC
45	static const char * const adaptor_names[] = {
46	"Soundcanvas",
47	"MS-124T",
48	"MS-124W S/A",
49	"MS-124W M/B",
50	"Generic"
51	};
52
53	#define SNDRV_SERIAL_NORMALBUFF 0 /* Normal blocking buffer operation */
54	#define SNDRV_SERIAL_DROPBUFF 1 /* Non-blocking discard operation */
55
56	static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
57	static char id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; / ID for this card */
58	static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE; /* Enable this card */
59	static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT; /* 0x3f8,0x2f8,0x3e8,0x2e8 */
60	static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ; /* 3,4,5,7,9,10,11,14,15 */
61	static int speed[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 38400}; /* 9600,19200,38400,57600,115200 */
62	static int base[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 115200}; /* baud base */
63	static int outs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; /* 1 to 16 */
64	static int ins[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; /* 1 to 16 */
65	static int adaptor[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = SNDRV_SERIAL_SOUNDCANVAS};
66	static bool droponfull[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS -1)] = SNDRV_SERIAL_NORMALBUFF };
67
68	module_param_array(index, int, NULL, 0444);
69	MODULE_PARM_DESC(index, "Index value for Serial MIDI.");
70	module_param_array(id, charp, NULL, 0444);
71	MODULE_PARM_DESC(id, "ID string for Serial MIDI.");
72	module_param_array(enable, bool, NULL, 0444);
73	MODULE_PARM_DESC(enable, "Enable UART16550A chip.");
74	module_param_hw_array(port, long, ioport, NULL, 0444);
75	MODULE_PARM_DESC(port, "Port # for UART16550A chip.");
76	module_param_hw_array(irq, int, irq, NULL, 0444);
77	MODULE_PARM_DESC(irq, "IRQ # for UART16550A chip.");
78	module_param_array(speed, int, NULL, 0444);
79	MODULE_PARM_DESC(speed, "Speed in bauds.");
80	module_param_array(base, int, NULL, 0444);
81	MODULE_PARM_DESC(base, "Base for divisor in bauds.");
82	module_param_array(outs, int, NULL, 0444);
83	MODULE_PARM_DESC(outs, "Number of MIDI outputs.");
84	module_param_array(ins, int, NULL, 0444);
85	MODULE_PARM_DESC(ins, "Number of MIDI inputs.");
86	module_param_array(droponfull, bool, NULL, 0444);
87	MODULE_PARM_DESC(droponfull, "Flag to enable drop-on-full buffer mode");
88
89	module_param_array(adaptor, int, NULL, 0444);
90	MODULE_PARM_DESC(adaptor, "Type of adaptor.");
91
92	/#define SNDRV_SERIAL_MS124W_MB_NOCOMBO 1/ /* Address outs as 0-3 instead of bitmap */
93
94	#define SNDRV_SERIAL_MAX_OUTS 16 /* max 64, min 16 */
95	#define SNDRV_SERIAL_MAX_INS 16 /* max 64, min 16 */
96
97	#define TX_BUFF_SIZE (1<<15) /* Must be 2^n */
98	#define TX_BUFF_MASK (TX_BUFF_SIZE - 1)
99
100	#define SERIAL_MODE_NOT_OPENED (0)
101	#define SERIAL_MODE_INPUT_OPEN (1 << 0)
102	#define SERIAL_MODE_OUTPUT_OPEN (1 << 1)
103	#define SERIAL_MODE_INPUT_TRIGGERED (1 << 2)
104	#define SERIAL_MODE_OUTPUT_TRIGGERED (1 << 3)
105
106	struct snd_uart16550 {
107	struct snd_card *card;
108	struct snd_rawmidi *rmidi;
109	struct snd_rawmidi_substream *midi_output[SNDRV_SERIAL_MAX_OUTS];
110	struct snd_rawmidi_substream *midi_input[SNDRV_SERIAL_MAX_INS];
111
112	int filemode; /* open status of file */
113
114	spinlock_t open_lock;
115
116	int irq;
117
118	unsigned long base;
119	struct resource *res_base;
120
121	unsigned int speed;
122	unsigned int speed_base;
123	unsigned char divisor;
124
125	unsigned char old_divisor_lsb;
126	unsigned char old_divisor_msb;
127	unsigned char old_line_ctrl_reg;
128
129	/* parameter for using of write loop */
130	short int fifo_limit; /* used in uart16550 */
131	short int fifo_count; /* used in uart16550 */
132
133	/* type of adaptor */
134	int adaptor;
135
136	/* inputs */
137	int prev_in;
138	unsigned char rstatus;
139
140	/* outputs */
141	int prev_out;
142	unsigned char prev_status[SNDRV_SERIAL_MAX_OUTS];
143
144	/* write buffer and its writing/reading position */
145	unsigned char tx_buff[TX_BUFF_SIZE];
146	int buff_in_count;
147	int buff_in;
148	int buff_out;
149	int drop_on_full;
150
151	/* wait timer */
152	unsigned int timer_running:1;
153	struct timer_list buffer_timer;
154
155	};
156
157	static struct platform_device *devices[SNDRV_CARDS];
158
159	static inline void snd_uart16550_add_timer(struct snd_uart16550 *uart)
160	{
161	if (!uart->timer_running) {
162	/* timer 38600bps * 10bit * 16byte */
163	mod_timer(&uart->buffer_timer, jiffies + (HZ + 255) / 256);
164	uart->timer_running = 1;
165	}
166	}
167
168	static inline void snd_uart16550_del_timer(struct snd_uart16550 *uart)
169	{
170	if (uart->timer_running) {
171	del_timer(&uart->buffer_timer);
172	uart->timer_running = 0;
173	}
174	}
175
176	/* This macro is only used in snd_uart16550_io_loop */
177	static inline void snd_uart16550_buffer_output(struct snd_uart16550 *uart)
178	{
179	unsigned short buff_out = uart->buff_out;
180	if (uart->buff_in_count > 0) {
181	outb(uart->tx_buff[buff_out], uart->base + UART_TX);
182	uart->fifo_count++;
183	buff_out++;
184	buff_out &= TX_BUFF_MASK;
185	uart->buff_out = buff_out;
186	uart->buff_in_count--;
187	}
188	}
189
190	/* This loop should be called with interrupts disabled
191	* We don't want to interrupt this,
192	* as we're already handling an interrupt
193	*/
194	static void snd_uart16550_io_loop(struct snd_uart16550 * uart)
195	{
196	unsigned char c, status;
197	int substream;
198
199	/* recall previous stream */
200	substream = uart->prev_in;
201
202	/* Read Loop */
203	while ((status = inb(uart->base + UART_LSR)) & UART_LSR_DR) {
204	/* while receive data ready */
205	c = inb(uart->base + UART_RX);
206
207	/* keep track of last status byte */
208	if (c & 0x80)
209	uart->rstatus = c;
210
211	/* handle stream switch */
212	if (uart->adaptor == SNDRV_SERIAL_GENERIC) {
213	if (uart->rstatus == 0xf5) {
214	if (c <= SNDRV_SERIAL_MAX_INS && c > 0)
215	substream = c - 1;
216	if (c != 0xf5)
217	/* prevent future bytes from being
218	interpreted as streams */
219	uart->rstatus = 0;
220	} else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN)
221	&& uart->midi_input[substream])
222	snd_rawmidi_receive(uart->midi_input[substream],
223	&c, 1);
224	} else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN) &&
225	uart->midi_input[substream])
226	snd_rawmidi_receive(uart->midi_input[substream], &c, 1);
227
228	if (status & UART_LSR_OE)
229	snd_printk(KERN_WARNING
230	"%s: Overrun on device at 0x%lx\n",
231	uart->rmidi->name, uart->base);
232	}
233
234	/* remember the last stream */
235	uart->prev_in = substream;
236
237	/* no need of check SERIAL_MODE_OUTPUT_OPEN because if not,
238	buffer is never filled. */
239	/* Check write status */
240	if (status & UART_LSR_THRE)
241	uart->fifo_count = 0;
242	if (uart->adaptor == SNDRV_SERIAL_MS124W_SA
243	\|\| uart->adaptor == SNDRV_SERIAL_GENERIC) {
244	/* Can't use FIFO, must send only when CTS is true */
245	status = inb(uart->base + UART_MSR);
246	while (uart->fifo_count == 0 && (status & UART_MSR_CTS) &&
247	uart->buff_in_count > 0) {
248	snd_uart16550_buffer_output(uart);
249	status = inb(uart->base + UART_MSR);
250	}
251	} else {
252	/* Write loop */
253	while (uart->fifo_count < uart->fifo_limit /* Can we write ? */
254	&& uart->buff_in_count > 0) /* Do we want to? */
255	snd_uart16550_buffer_output(uart);
256	}
257	if (uart->irq < 0 && uart->buff_in_count > 0)
258	snd_uart16550_add_timer(uart);
259	}
260
261	/* NOTES ON SERVICING INTERUPTS
262	* ---------------------------
263	* After receiving a interrupt, it is important to indicate to the UART that
264	* this has been done.
265	* For a Rx interrupt, this is done by reading the received byte.
266	* For a Tx interrupt this is done by either:
267	* a) Writing a byte
268	* b) Reading the IIR
269	* It is particularly important to read the IIR if a Tx interrupt is received
270	* when there is no data in tx_buff[], as in this case there no other
271	* indication that the interrupt has been serviced, and it remains outstanding
272	* indefinitely. This has the curious side effect that and no further interrupts
273	* will be generated from this device AT ALL!!.
274	* It is also desirable to clear outstanding interrupts when the device is
275	* opened/closed.
276	*
277	*
278	* Note that some devices need OUT2 to be set before they will generate
279	* interrupts at all. (Possibly tied to an internal pull-up on CTS?)
280	*/
281	static irqreturn_t snd_uart16550_interrupt(int irq, void *dev_id)
282	{
283	struct snd_uart16550 *uart;
284
285	uart = dev_id;
286	spin_lock(&uart->open_lock);
287	if (uart->filemode == SERIAL_MODE_NOT_OPENED) {
288	spin_unlock(&uart->open_lock);
289	return IRQ_NONE;
290	}
291	/* indicate to the UART that the interrupt has been serviced */
292	inb(uart->base + UART_IIR);
293	snd_uart16550_io_loop(uart);
294	spin_unlock(&uart->open_lock);
295	return IRQ_HANDLED;
296	}
297
298	/* When the polling mode, this function calls snd_uart16550_io_loop. */
299	static void snd_uart16550_buffer_timer(struct timer_list *t)
300	{
301	unsigned long flags;
302	struct snd_uart16550 *uart;
303
304	uart = from_timer(uart, t, buffer_timer);
305	spin_lock_irqsave(&uart->open_lock, flags);
306	snd_uart16550_del_timer(uart);
307	snd_uart16550_io_loop(uart);
308	spin_unlock_irqrestore(&uart->open_lock, flags);
309	}
310
311	/*
312	* this method probes, if an uart sits on given port
313	* return 0 if found
314	* return negative error if not found
315	*/
316	static int snd_uart16550_detect(struct snd_uart16550 *uart)
317	{
318	unsigned long io_base = uart->base;
319	int ok;
320	unsigned char c;
321
322	/* Do some vague tests for the presence of the uart */
323	if (io_base == 0 \|\| io_base == SNDRV_AUTO_PORT) {
324	return -ENODEV; /* Not configured */
325	}
326
327	uart->res_base = request_region(io_base, 8, "Serial MIDI");
328	if (uart->res_base == NULL) {
329	snd_printk(KERN_ERR "u16550: can't grab port 0x%lx\n", io_base);
330	return -EBUSY;
331	}
332
333	/* uart detected unless one of the following tests should fail */
334	ok = 1;
335	/* 8 data-bits, 1 stop-bit, parity off, DLAB = 0 */
336	outb(UART_LCR_WLEN8, io_base + UART_LCR); /* Line Control Register */
337	c = inb(io_base + UART_IER);
338	/* The top four bits of the IER should always == 0 */
339	if ((c & 0xf0) != 0)
340	ok = 0; /* failed */
341
342	outb(0xaa, io_base + UART_SCR);
343	/* Write arbitrary data into the scratch reg */
344	c = inb(io_base + UART_SCR);
345	/* If it comes back, it's OK */
346	if (c != 0xaa)
347	ok = 0; /* failed */
348
349	outb(0x55, io_base + UART_SCR);
350	/* Write arbitrary data into the scratch reg */
351	c = inb(io_base + UART_SCR);
352	/* If it comes back, it's OK */
353	if (c != 0x55)
354	ok = 0; /* failed */
355
356	return ok;
357	}
358
359	static void snd_uart16550_do_open(struct snd_uart16550 * uart)
360	{
361	char byte;
362
363	/* Initialize basic variables */
364	uart->buff_in_count = 0;
365	uart->buff_in = 0;
366	uart->buff_out = 0;
367	uart->fifo_limit = 1;
368	uart->fifo_count = 0;
369	uart->timer_running = 0;
370
371	outb(UART_FCR_ENABLE_FIFO /* Enable FIFO's (if available) */
372	\| UART_FCR_CLEAR_RCVR /* Clear receiver FIFO */
373	\| UART_FCR_CLEAR_XMIT /* Clear transmitter FIFO */
374	\| UART_FCR_TRIGGER_4 /* Set FIFO trigger at 4-bytes */
375	/* NOTE: interrupt generated after T=(time)4-bytes
376	* if less than UART_FCR_TRIGGER bytes received
377	*/
378	,uart->base + UART_FCR); /* FIFO Control Register */
379
380	if ((inb(uart->base + UART_IIR) & 0xf0) == 0xc0)
381	uart->fifo_limit = 16;
382	if (uart->divisor != 0) {
383	uart->old_line_ctrl_reg = inb(uart->base + UART_LCR);
384	outb(UART_LCR_DLAB /* Divisor latch access bit */
385	,uart->base + UART_LCR); /* Line Control Register */
386	uart->old_divisor_lsb = inb(uart->base + UART_DLL);
387	uart->old_divisor_msb = inb(uart->base + UART_DLM);
388
389	outb(uart->divisor
390	,uart->base + UART_DLL); /* Divisor Latch Low */
391	outb(0
392	,uart->base + UART_DLM); /* Divisor Latch High */
393	/* DLAB is reset to 0 in next outb() */
394	}
395	/* Set serial parameters (parity off, etc) */
396	outb(UART_LCR_WLEN8 /* 8 data-bits */
397	\| 0 /* 1 stop-bit */
398	\| 0 /* parity off */
399	\| 0 /* DLAB = 0 */
400	,uart->base + UART_LCR); /* Line Control Register */
401
402	switch (uart->adaptor) {
403	default:
404	outb(UART_MCR_RTS /* Set Request-To-Send line active */
405	\| UART_MCR_DTR /* Set Data-Terminal-Ready line active */
406	\| UART_MCR_OUT2 /* Set OUT2 - not always required, but when
407	* it is, it is ESSENTIAL for enabling interrupts
408	*/
409	,uart->base + UART_MCR); /* Modem Control Register */
410	break;
411	case SNDRV_SERIAL_MS124W_SA:
412	case SNDRV_SERIAL_MS124W_MB:
413	/* MS-124W can draw power from RTS and DTR if they
414	are in opposite states. */
415	outb(UART_MCR_RTS \| (0&UART_MCR_DTR) \| UART_MCR_OUT2,
416	uart->base + UART_MCR);
417	break;
418	case SNDRV_SERIAL_MS124T:
419	/* MS-124T can draw power from RTS and/or DTR (preferably
420	both) if they are both asserted. */
421	outb(UART_MCR_RTS \| UART_MCR_DTR \| UART_MCR_OUT2,
422	uart->base + UART_MCR);
423	break;
424	}
425
426	if (uart->irq < 0) {
427	byte = (0 & UART_IER_RDI) /* Disable Receiver data interrupt */
428	\|(0 & UART_IER_THRI) /* Disable Transmitter holding register empty interrupt */
429	;
430	} else if (uart->adaptor == SNDRV_SERIAL_MS124W_SA) {
431	byte = UART_IER_RDI /* Enable Receiver data interrupt */
432	\| UART_IER_MSI /* Enable Modem status interrupt */
433	;
434	} else if (uart->adaptor == SNDRV_SERIAL_GENERIC) {
435	byte = UART_IER_RDI /* Enable Receiver data interrupt */
436	\| UART_IER_MSI /* Enable Modem status interrupt */
437	\| UART_IER_THRI /* Enable Transmitter holding register empty interrupt */
438	;
439	} else {
440	byte = UART_IER_RDI /* Enable Receiver data interrupt */
441	\| UART_IER_THRI /* Enable Transmitter holding register empty interrupt */
442	;
443	}
444	outb(byte, uart->base + UART_IER); /* Interrupt enable Register */
445
446	inb(uart->base + UART_LSR); /* Clear any pre-existing overrun indication */
447	inb(uart->base + UART_IIR); /* Clear any pre-existing transmit interrupt */
448	inb(uart->base + UART_RX); /* Clear any pre-existing receive interrupt */
449	}
450
451	static void snd_uart16550_do_close(struct snd_uart16550 * uart)
452	{
453	if (uart->irq < 0)
454	snd_uart16550_del_timer(uart);
455
456	/* NOTE: may need to disable interrupts before de-registering out handler.
457	* For now, the consequences are harmless.
458	*/
459
460	outb((0 & UART_IER_RDI) /* Disable Receiver data interrupt */
461	\|(0 & UART_IER_THRI) /* Disable Transmitter holding register empty interrupt */
462	,uart->base + UART_IER); /* Interrupt enable Register */
463
464	switch (uart->adaptor) {
465	default:
466	outb((0 & UART_MCR_RTS) /* Deactivate Request-To-Send line */
467	\|(0 & UART_MCR_DTR) /* Deactivate Data-Terminal-Ready line */
468	\|(0 & UART_MCR_OUT2) /* Deactivate OUT2 */
469	,uart->base + UART_MCR); /* Modem Control Register */
470	break;
471	case SNDRV_SERIAL_MS124W_SA:
472	case SNDRV_SERIAL_MS124W_MB:
473	/* MS-124W can draw power from RTS and DTR if they
474	are in opposite states; leave it powered. */
475	outb(UART_MCR_RTS \| (0&UART_MCR_DTR) \| (0&UART_MCR_OUT2),
476	uart->base + UART_MCR);
477	break;
478	case SNDRV_SERIAL_MS124T:
479	/* MS-124T can draw power from RTS and/or DTR (preferably
480	both) if they are both asserted; leave it powered. */
481	outb(UART_MCR_RTS \| UART_MCR_DTR \| (0&UART_MCR_OUT2),
482	uart->base + UART_MCR);
483	break;
484	}
485
486	inb(uart->base + UART_IIR); /* Clear any outstanding interrupts */
487
488	/* Restore old divisor */
489	if (uart->divisor != 0) {
490	outb(UART_LCR_DLAB /* Divisor latch access bit */
491	,uart->base + UART_LCR); /* Line Control Register */
492	outb(uart->old_divisor_lsb
493	,uart->base + UART_DLL); /* Divisor Latch Low */
494	outb(uart->old_divisor_msb
495	,uart->base + UART_DLM); /* Divisor Latch High */
496	/* Restore old LCR (data bits, stop bits, parity, DLAB) */
497	outb(uart->old_line_ctrl_reg
498	,uart->base + UART_LCR); /* Line Control Register */
499	}
500	}
501
502	static int snd_uart16550_input_open(struct snd_rawmidi_substream *substream)
503	{
504	unsigned long flags;
505	struct snd_uart16550 *uart = substream->rmidi->private_data;
506
507	spin_lock_irqsave(&uart->open_lock, flags);
508	if (uart->filemode == SERIAL_MODE_NOT_OPENED)
509	snd_uart16550_do_open(uart);
510	uart->filemode \|= SERIAL_MODE_INPUT_OPEN;
511	uart->midi_input[substream->number] = substream;
512	spin_unlock_irqrestore(&uart->open_lock, flags);
513	return 0;
514	}
515
516	static int snd_uart16550_input_close(struct snd_rawmidi_substream *substream)
517	{
518	unsigned long flags;
519	struct snd_uart16550 *uart = substream->rmidi->private_data;
520
521	spin_lock_irqsave(&uart->open_lock, flags);
522	uart->filemode &= ~SERIAL_MODE_INPUT_OPEN;
523	uart->midi_input[substream->number] = NULL;
524	if (uart->filemode == SERIAL_MODE_NOT_OPENED)
525	snd_uart16550_do_close(uart);
526	spin_unlock_irqrestore(&uart->open_lock, flags);
527	return 0;
528	}
529
530	static void snd_uart16550_input_trigger(struct snd_rawmidi_substream *substream,
531	int up)
532	{
533	unsigned long flags;
534	struct snd_uart16550 *uart = substream->rmidi->private_data;
535
536	spin_lock_irqsave(&uart->open_lock, flags);
537	if (up)
538	uart->filemode \|= SERIAL_MODE_INPUT_TRIGGERED;
539	else
540	uart->filemode &= ~SERIAL_MODE_INPUT_TRIGGERED;
541	spin_unlock_irqrestore(&uart->open_lock, flags);
542	}
543
544	static int snd_uart16550_output_open(struct snd_rawmidi_substream *substream)
545	{
546	unsigned long flags;
547	struct snd_uart16550 *uart = substream->rmidi->private_data;
548
549	spin_lock_irqsave(&uart->open_lock, flags);
550	if (uart->filemode == SERIAL_MODE_NOT_OPENED)
551	snd_uart16550_do_open(uart);
552	uart->filemode \|= SERIAL_MODE_OUTPUT_OPEN;
553	uart->midi_output[substream->number] = substream;
554	spin_unlock_irqrestore(&uart->open_lock, flags);
555	return 0;
556	};
557
558	static int snd_uart16550_output_close(struct snd_rawmidi_substream *substream)
559	{
560	unsigned long flags;
561	struct snd_uart16550 *uart = substream->rmidi->private_data;
562
563	spin_lock_irqsave(&uart->open_lock, flags);
564	uart->filemode &= ~SERIAL_MODE_OUTPUT_OPEN;
565	uart->midi_output[substream->number] = NULL;
566	if (uart->filemode == SERIAL_MODE_NOT_OPENED)
567	snd_uart16550_do_close(uart);
568	spin_unlock_irqrestore(&uart->open_lock, flags);
569	return 0;
570	};
571
572	static inline int snd_uart16550_buffer_can_write(struct snd_uart16550 *uart,
573	int Num)
574	{
575	if (uart->buff_in_count + Num < TX_BUFF_SIZE)
576	return 1;
577	else
578	return 0;
579	}
580
581	static inline int snd_uart16550_write_buffer(struct snd_uart16550 *uart,
582	unsigned char byte)
583	{
584	unsigned short buff_in = uart->buff_in;
585	if (uart->buff_in_count < TX_BUFF_SIZE) {
586	uart->tx_buff[buff_in] = byte;
587	buff_in++;
588	buff_in &= TX_BUFF_MASK;
589	uart->buff_in = buff_in;
590	uart->buff_in_count++;
591	if (uart->irq < 0) /* polling mode */
592	snd_uart16550_add_timer(uart);
593	return 1;
594	} else
595	return 0;
596	}
597
598	static int snd_uart16550_output_byte(struct snd_uart16550 *uart,
599	struct snd_rawmidi_substream *substream,
600	unsigned char midi_byte)
601	{
602	if (uart->buff_in_count == 0 /* Buffer empty? */
603	&& ((uart->adaptor != SNDRV_SERIAL_MS124W_SA &&
604	uart->adaptor != SNDRV_SERIAL_GENERIC) \|\|
605	(uart->fifo_count == 0 /* FIFO empty? */
606	&& (inb(uart->base + UART_MSR) & UART_MSR_CTS)))) { /* CTS? */
607
608	/* Tx Buffer Empty - try to write immediately */
609	if ((inb(uart->base + UART_LSR) & UART_LSR_THRE) != 0) {
610	/* Transmitter holding register (and Tx FIFO) empty */
611	uart->fifo_count = 1;
612	outb(midi_byte, uart->base + UART_TX);
613	} else {
614	if (uart->fifo_count < uart->fifo_limit) {
615	uart->fifo_count++;
616	outb(midi_byte, uart->base + UART_TX);
617	} else {
618	/* Cannot write (buffer empty) -
619	* put char in buffer */
620	snd_uart16550_write_buffer(uart, midi_byte);
621	}
622	}
623	} else {
624	if (!snd_uart16550_write_buffer(uart, midi_byte)) {
625	snd_printk(KERN_WARNING
626	"%s: Buffer overrun on device at 0x%lx\n",
627	uart->rmidi->name, uart->base);
628	return 0;
629	}
630	}
631
632	return 1;
633	}
634
635	static void snd_uart16550_output_write(struct snd_rawmidi_substream *substream)
636	{
637	unsigned long flags;
638	unsigned char midi_byte, addr_byte;
639	struct snd_uart16550 *uart = substream->rmidi->private_data;
640	char first;
641	static unsigned long lasttime = 0;
642
643	/* Interrupts are disabled during the updating of the tx_buff,
644	* since it is 'bad' to have two processes updating the same
645	* variables (ie buff_in & buff_out)
646	*/
647
648	spin_lock_irqsave(&uart->open_lock, flags);
649
650	if (uart->irq < 0) /* polling */
651	snd_uart16550_io_loop(uart);
652
653	if (uart->adaptor == SNDRV_SERIAL_MS124W_MB) {
654	while (1) {
655	/* buffer full? */
656	/* in this mode we need two bytes of space */
657	if (uart->buff_in_count > TX_BUFF_SIZE - 2)
658	break;
659	if (snd_rawmidi_transmit(substream, &midi_byte, 1) != 1)
660	break;
661	#ifdef SNDRV_SERIAL_MS124W_MB_NOCOMBO
662	/* select exactly one of the four ports */
663	addr_byte = (1 << (substream->number + 4)) \| 0x08;
664	#else
665	/* select any combination of the four ports */
666	addr_byte = (substream->number << 4) \| 0x08;
667	/* ...except none */
668	if (addr_byte == 0x08)
669	addr_byte = 0xf8;
670	#endif
671	snd_uart16550_output_byte(uart, substream, addr_byte);
672	/* send midi byte */
673	snd_uart16550_output_byte(uart, substream, midi_byte);
674	}
675	} else {
676	first = 0;
677	while (snd_rawmidi_transmit_peek(substream, &midi_byte, 1) == 1) {
678	/* Also send F5 after 3 seconds with no data
679	* to handle device disconnect */
680	if (first == 0 &&
681	(uart->adaptor == SNDRV_SERIAL_SOUNDCANVAS \|\|
682	uart->adaptor == SNDRV_SERIAL_GENERIC) &&
683	(uart->prev_out != substream->number \|\|
684	time_after(jiffies, lasttime + 3*HZ))) {
685
686	if (snd_uart16550_buffer_can_write(uart, 3)) {
687	/* Roland Soundcanvas part selection */
688	/* If this substream of the data is
689	* different previous substream
690	* in this uart, send the change part
691	* event
692	*/
693	uart->prev_out = substream->number;
694	/* change part */
695	snd_uart16550_output_byte(uart, substream,
696	0xf5);
697	/* data */
698	snd_uart16550_output_byte(uart, substream,
699	uart->prev_out + 1);
700	/* If midi_byte is a data byte,
701	* send the previous status byte */
702	if (midi_byte < 0x80 &&
703	uart->adaptor == SNDRV_SERIAL_SOUNDCANVAS)
704	snd_uart16550_output_byte(uart, substream, uart->prev_status[uart->prev_out]);
705	} else if (!uart->drop_on_full)
706	break;
707
708	}
709
710	/* send midi byte */
711	if (!snd_uart16550_output_byte(uart, substream, midi_byte) &&
712	!uart->drop_on_full )
713	break;
714
715	if (midi_byte >= 0x80 && midi_byte < 0xf0)
716	uart->prev_status[uart->prev_out] = midi_byte;
717	first = 1;
718
719	snd_rawmidi_transmit_ack( substream, 1 );
720	}
721	lasttime = jiffies;
722	}
723	spin_unlock_irqrestore(&uart->open_lock, flags);
724	}
725
726	static void snd_uart16550_output_trigger(struct snd_rawmidi_substream *substream,
727	int up)
728	{
729	unsigned long flags;
730	struct snd_uart16550 *uart = substream->rmidi->private_data;
731
732	spin_lock_irqsave(&uart->open_lock, flags);
733	if (up)
734	uart->filemode \|= SERIAL_MODE_OUTPUT_TRIGGERED;
735	else
736	uart->filemode &= ~SERIAL_MODE_OUTPUT_TRIGGERED;
737	spin_unlock_irqrestore(&uart->open_lock, flags);
738	if (up)
739	snd_uart16550_output_write(substream);
740	}
741
742	static const struct snd_rawmidi_ops snd_uart16550_output =
743	{
744	.open = snd_uart16550_output_open,
745	.close = snd_uart16550_output_close,
746	.trigger = snd_uart16550_output_trigger,
747	};
748
749	static const struct snd_rawmidi_ops snd_uart16550_input =
750	{
751	.open = snd_uart16550_input_open,
752	.close = snd_uart16550_input_close,
753	.trigger = snd_uart16550_input_trigger,
754	};
755
756	static int snd_uart16550_free(struct snd_uart16550 *uart)
757	{
758	if (uart->irq >= 0)
759	free_irq(uart->irq, uart);
760	release_and_free_resource(uart->res_base);
761	kfree(uart);
762	return 0;
763	};
764
765	static int snd_uart16550_dev_free(struct snd_device *device)
766	{
767	struct snd_uart16550 *uart = device->device_data;
768	return snd_uart16550_free(uart);
769	}
770
771	static int snd_uart16550_create(struct snd_card *card,
772	unsigned long iobase,
773	int irq,
774	unsigned int speed,
775	unsigned int base,
776	int adaptor,
777	int droponfull,
778	struct snd_uart16550 **ruart)
779	{
780	static const struct snd_device_ops ops = {
781	.dev_free = snd_uart16550_dev_free,
782	};
783	struct snd_uart16550 *uart;
784	int err;
785
786
787	if ((uart = kzalloc(sizeof(*uart), GFP_KERNEL)) == NULL)
788	return -ENOMEM;
789	uart->adaptor = adaptor;
790	uart->card = card;
791	spin_lock_init(&uart->open_lock);
792	uart->irq = -1;
793	uart->base = iobase;
794	uart->drop_on_full = droponfull;
795
796	if ((err = snd_uart16550_detect(uart)) <= 0) {
797	printk(KERN_ERR "no UART detected at 0x%lx\n", iobase);
798	snd_uart16550_free(uart);
799	return -ENODEV;
800	}
801
802	if (irq >= 0 && irq != SNDRV_AUTO_IRQ) {
803	if (request_irq(irq, snd_uart16550_interrupt,
804	0, "Serial MIDI", uart)) {
805	snd_printk(KERN_WARNING
806	"irq %d busy. Using Polling.\n", irq);
807	} else {
808	uart->irq = irq;
809	}
810	}
811	uart->divisor = base / speed;
812	uart->speed = base / (unsigned int)uart->divisor;
813	uart->speed_base = base;
814	uart->prev_out = -1;
815	uart->prev_in = 0;
816	uart->rstatus = 0;
817	memset(uart->prev_status, 0x80, sizeof(unsigned char) * SNDRV_SERIAL_MAX_OUTS);
818	timer_setup(&uart->buffer_timer, snd_uart16550_buffer_timer, 0);
819	uart->timer_running = 0;
820
821	/* Register device */
822	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, uart, &ops)) < 0) {
823	snd_uart16550_free(uart);
824	return err;
825	}
826
827	switch (uart->adaptor) {
828	case SNDRV_SERIAL_MS124W_SA:
829	case SNDRV_SERIAL_MS124W_MB:
830	/* MS-124W can draw power from RTS and DTR if they
831	are in opposite states. */
832	outb(UART_MCR_RTS \| (0&UART_MCR_DTR), uart->base + UART_MCR);
833	break;
834	case SNDRV_SERIAL_MS124T:
835	/* MS-124T can draw power from RTS and/or DTR (preferably
836	both) if they are asserted. */
837	outb(UART_MCR_RTS \| UART_MCR_DTR, uart->base + UART_MCR);
838	break;
839	default:
840	break;
841	}
842
843	if (ruart)
844	*ruart = uart;
845
846	return 0;
847	}
848
849	static void snd_uart16550_substreams(struct snd_rawmidi_str *stream)
850	{
851	struct snd_rawmidi_substream *substream;
852
853	list_for_each_entry(substream, &stream->substreams, list) {
854	sprintf(substream->name, "Serial MIDI %d", substream->number + 1);
855	}
856	}
857
858	static int snd_uart16550_rmidi(struct snd_uart16550 *uart, int device,
859	int outs, int ins,
860	struct snd_rawmidi **rmidi)
861	{
862	struct snd_rawmidi *rrawmidi;
863	int err;
864
865	err = snd_rawmidi_new(uart->card, "UART Serial MIDI", device,
866	outs, ins, &rrawmidi);
867	if (err < 0)
868	return err;
869	snd_rawmidi_set_ops(rrawmidi, SNDRV_RAWMIDI_STREAM_INPUT,
870	&snd_uart16550_input);
871	snd_rawmidi_set_ops(rrawmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
872	&snd_uart16550_output);
873	strcpy(rrawmidi->name, "Serial MIDI");
874	snd_uart16550_substreams(&rrawmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
875	snd_uart16550_substreams(&rrawmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
876	rrawmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT \|
877	SNDRV_RAWMIDI_INFO_INPUT \|
878	SNDRV_RAWMIDI_INFO_DUPLEX;
879	rrawmidi->private_data = uart;
880	if (rmidi)
881	*rmidi = rrawmidi;
882	return 0;
883	}
884
885	static int snd_serial_probe(struct platform_device *devptr)
886	{
887	struct snd_card *card;
888	struct snd_uart16550 *uart;
889	int err;
890	int dev = devptr->id;
891
892	switch (adaptor[dev]) {
893	case SNDRV_SERIAL_SOUNDCANVAS:
894	ins[dev] = 1;
895	break;
896	case SNDRV_SERIAL_MS124T:
897	case SNDRV_SERIAL_MS124W_SA:
898	outs[dev] = 1;
899	ins[dev] = 1;
900	break;
901	case SNDRV_SERIAL_MS124W_MB:
902	outs[dev] = 16;
903	ins[dev] = 1;
904	break;
905	case SNDRV_SERIAL_GENERIC:
906	break;
907	default:
908	snd_printk(KERN_ERR
909	"Adaptor type is out of range 0-%d (%d)\n",
910	SNDRV_SERIAL_MAX_ADAPTOR, adaptor[dev]);
911	return -ENODEV;
912	}
913
914	if (outs[dev] < 1 \|\| outs[dev] > SNDRV_SERIAL_MAX_OUTS) {
915	snd_printk(KERN_ERR
916	"Count of outputs is out of range 1-%d (%d)\n",
917	SNDRV_SERIAL_MAX_OUTS, outs[dev]);
918	return -ENODEV;
919	}
920
921	if (ins[dev] < 1 \|\| ins[dev] > SNDRV_SERIAL_MAX_INS) {
922	snd_printk(KERN_ERR
923	"Count of inputs is out of range 1-%d (%d)\n",
924	SNDRV_SERIAL_MAX_INS, ins[dev]);
925	return -ENODEV;
926	}
927
928	err = snd_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
929	0, &card);
930	if (err < 0)
931	return err;
932
933	strcpy(card->driver, "Serial");
934	strcpy(card->shortname, "Serial MIDI (UART16550A)");
935
936	if ((err = snd_uart16550_create(card,
937	port[dev],
938	irq[dev],
939	speed[dev],
940	base[dev],
941	adaptor[dev],
942	droponfull[dev],
943	&uart)) < 0)
944	goto _err;
945
946	err = snd_uart16550_rmidi(uart, 0, outs[dev], ins[dev], &uart->rmidi);
947	if (err < 0)
948	goto _err;
949
950	sprintf(card->longname, "%s [%s] at %#lx, irq %d",
951	card->shortname,
952	adaptor_names[uart->adaptor],
953	uart->base,
954	uart->irq);
955
956	if ((err = snd_card_register(card)) < 0)
957	goto _err;
958
959	platform_set_drvdata(devptr, card);
960	return 0;
961
962	_err:
963	snd_card_free(card);
964	return err;
965	}
966
967	static int snd_serial_remove(struct platform_device *devptr)
968	{
969	snd_card_free(platform_get_drvdata(devptr));
970	return 0;
971	}
972
973	#define SND_SERIAL_DRIVER "snd_serial_u16550"
974
975	static struct platform_driver snd_serial_driver = {
976	.probe = snd_serial_probe,
977	.remove = snd_serial_remove,
978	.driver = {
979	.name = SND_SERIAL_DRIVER,
980	},
981	};
982
983	static void snd_serial_unregister_all(void)
984	{
985	int i;
986
987	for (i = 0; i < ARRAY_SIZE(devices); ++i)
988	platform_device_unregister(devices[i]);
989	platform_driver_unregister(&snd_serial_driver);
990	}
991
992	static int __init alsa_card_serial_init(void)
993	{
994	int i, cards, err;
995
996	if ((err = platform_driver_register(&snd_serial_driver)) < 0)
997	return err;
998
999	cards = 0;
1000	for (i = 0; i < SNDRV_CARDS; i++) {
1001	struct platform_device *device;
1002	if (! enable[i])
1003	continue;
1004	device = platform_device_register_simple(SND_SERIAL_DRIVER,
1005	i, NULL, 0);
1006	if (IS_ERR(device))
1007	continue;
1008	if (!platform_get_drvdata(device)) {
1009	platform_device_unregister(device);
1010	continue;
1011	}
1012	devices[i] = device;
1013	cards++;
1014	}
1015	if (! cards) {
1016	#ifdef MODULE
1017	printk(KERN_ERR "serial midi soundcard not found or device busy\n");
1018	#endif
1019	snd_serial_unregister_all();
1020	return -ENODEV;
1021	}
1022	return 0;
1023	}
1024
1025	static void __exit alsa_card_serial_exit(void)
1026	{
1027	snd_serial_unregister_all();
1028	}
1029
1030	module_init(alsa_card_serial_init)
1031	module_exit(alsa_card_serial_exit)

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