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source: GPL/trunk/alsa-kernel/drivers/serial-u16550.c@ 250

Last change on this file since 250 was 34, checked in by vladest, 20 years ago
Latest update from ALSA. some intial > 15 interrupts support
File size: 36.4 KB

Line
1	/*
2	* serial.c
3	* Copyright (c) by Jaroslav Kysela <perex@suse.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	* Sat Mar 31 17:27:57 PST 2001 tim.mann@compaq.com
11	* Added support for the Midiator MS-124T and for the MS-124W in
12	* Single Addressed (S/A) or Multiple Burst (M/B) mode, with
13	* power derived either parasitically from the serial port or
14	* from a separate power supply.
15	*
16	* The new snd_adaptor module parameter allows you to select
17	* either the default Roland Soundcanvas support (0), which was
18	* previously included in this driver but was not documented,
19	* Midiator MS-124T support (1), Midiator MS-124W S/A mode
20	* support (2), or MS-124W M/B mode support (3). For the
21	* Midiator MS-124W, you must set the physical M-S and A-B
22	* switches on the Midiator to match the driver mode you select.
23	*
24	* - In Roland Soundcanvas mode, multiple ALSA raw MIDI
25	* substreams are supported (midiCnD0-midiCnD15). Whenever you
26	* write to a different substream, the driver sends the
27	* nonstandard MIDI command sequence F5 NN, where NN is the
28	* substream number plus 1. Roland modules use this command to
29	* switch between different "parts", so this feature lets you
30	* treat each part as a distinct raw MIDI substream. The driver
31	* provides no way to send F5 00 (no selection) or to not send
32	* the F5 NN command sequence at all; perhaps it ought to.
33	*
34	* - In MS-124T mode, one raw MIDI substream is supported
35	* (midiCnD0); the snd_outs module parameter is automatically set
36	* to 1. The driver sends the same data to all four MIDI Out
37	* connectors. Set the A-B switch and the snd_speed module
38	* parameter to match (A=19200, B=9600).
39	*
40	* Usage example for MS-124T, with A-B switch in A position:
41	* setserial /dev/ttyS0 uart none
42	* /sbin/modprobe snd-card-serial snd_port=0x3f8 snd_irq=4 \
43	* snd_adaptor=1 snd_speed=19200
44	*
45	* - In MS-124W S/A mode, one raw MIDI substream is supported
46	* (midiCnD0); the snd_outs module parameter is automatically set
47	* to 1. The driver sends the same data to all four MIDI Out
48	* connectors at full MIDI speed.
49	*
50	* Usage example for S/A mode:
51	* setserial /dev/ttyS0 uart none
52	* /sbin/modprobe snd-card-serial snd_port=0x3f8 snd_irq=4 \
53	* snd_adaptor=2
54	*
55	* - In MS-124W M/B mode, the driver supports 16 ALSA raw MIDI
56	* substreams; the snd_outs module parameter is automatically set
57	* to 16. The substream number gives a bitmask of which MIDI Out
58	* connectors the data should be sent to, with midiCnD1 sending
59	* to Out 1, midiCnD2 to Out 2, midiCnD4 to Out 3, and midiCnD8
60	* to Out 4. Thus midiCnD15 sends the data to all 4 ports. As a
61	* special case, midiCnD0 also sends to all ports, since it is
62	* not useful to send the data to no ports. M/B mode has extra
63	* overhead to select the MIDI Out for each byte, so the
64	* aggregate data rate across all four MIDI Outs is at most one
65	* byte every 520 us, as compared with the full MIDI data rate of
66	* one byte every 320 us per port.
67	*
68	* Usage example for M/B mode:
69	* setserial /dev/ttyS0 uart none
70	* /sbin/insmod snd-card-serial snd_port=0x3f8 snd_irq=4 \
71	* snd_adaptor=3
72	*
73	* - The MS-124W hardware's M/A mode is currently not supported.
74	* This mode allows the MIDI Outs to act independently at double
75	* the aggregate throughput of M/B, but does not allow sending
76	* the same byte simultaneously to multiple MIDI Outs. The M/A
77	* protocol requires the driver to twiddle the modem control
78	* lines under timing constraints, so it would be a bit more
79	* complicated to implement than the other modes.
80	*
81	* - Midiator models other than MS-124W and MS-124T are currently
82	* not supported. Note that the suffix letter is significant;
83	* the MS-124 and MS-124B are not compatible, nor are the other
84	* known models MS-101, MS-101B, MS-103, and MS-114. I do have
85	* documentation that partially covers these models, but no units
86	* to experiment with. The MS-124W support is tested with a real
87	* unit. The MS-124T support is untested, but should work.
88	*
89	* This program is free software; you can redistribute it and/or modify
90	* it under the terms of the GNU General Public License as published by
91	* the Free Software Foundation; either version 2 of the License, or
92	* (at your option) any later version.
93	*
94	* This program is distributed in the hope that it will be useful,
95	* but WITHOUT ANY WARRANTY; without even the implied warranty of
96	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
97	* GNU General Public License for more details.
98	*
99	* You should have received a copy of the GNU General Public License
100	* along with this program; if not, write to the Free Software
101	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
102	*
103	*/
104
105
106	#define SNDRV_MAIN_OBJECT_FILE
107
108	#include <sound/driver.h>
109	#include <sound/rawmidi.h>
110	#define SNDRV_GET_ID
111	#include <sound/initval.h>
112
113	#include <linux/serial_reg.h>
114
115	EXPORT_NO_SYMBOLS;
116	MODULE_DESCRIPTION("MIDI serial");
117	MODULE_CLASSES("{sound}");
118	MODULE_DEVICES("{{ALSA, MIDI serial}}");
119
120	#define SNDRV_SERIAL_SOUNDCANVAS 0 /* Roland Soundcanvas; F5 NN selects part */
121	#define SNDRV_SERIAL_MS124T 1 /* Midiator MS-124T */
122	#define SNDRV_SERIAL_MS124W_SA 2 /* Midiator MS-124W in S/A mode */
123	#define SNDRV_SERIAL_MS124W_MB 3 /* Midiator MS-124W in M/B mode */
124	#define SNDRV_SERIAL_MAX_ADAPTOR SNDRV_SERIAL_MS124W_MB
125	static char *adaptor_names[] = {
126	"Soundcanvas",
127	"MS-124T",
128	"MS-124W S/A",
129	"MS-124W M/B"
130	};
131
132	static int snd_index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
133	static char snd_id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; / ID for this card */
134	static int snd_enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE; /* Enable this card */
135	static long snd_port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT; /* 0x3f8,0x2f8,0x3e8,0x2e8 */
136	static int snd_irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ; /* 3,4,5,7,9,10,11,14,15 */
137	#ifdef TARGET_OS2
138	static int snd_speed[SNDRV_CARDS] = {REPEAT_SNDRV(38400)}; /* 9600,19200,38400,57600,115200 */
139	static int snd_base[SNDRV_CARDS] = {REPEAT_SNDRV(115200)}; /* baud base */
140	static int snd_outs[SNDRV_CARDS] = {REPEAT_SNDRV(1)}; /* 1 to 16 */
141	static int snd_adaptor[SNDRV_CARDS] = {REPEAT_SNDRV(SNDRV_SERIAL_SOUNDCANVAS)};
142	#else
143	static int snd_speed[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 38400}; /* 9600,19200,38400,57600,115200 */
144	static int snd_base[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 115200}; /* baud base */
145	static int snd_outs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; /* 1 to 16 */
146	static int snd_adaptor[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = SNDRV_SERIAL_SOUNDCANVAS};
147	#endif
148
149	MODULE_PARM(snd_index, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
150	MODULE_PARM_DESC(snd_index, "Index value for Serial MIDI.");
151	MODULE_PARM_SYNTAX(snd_index, SNDRV_INDEX_DESC);
152	MODULE_PARM(snd_id, "1-" __MODULE_STRING(SNDRV_CARDS) "s");
153	MODULE_PARM_DESC(snd_id, "ID string for Serial MIDI.");
154	MODULE_PARM_SYNTAX(snd_id, SNDRV_ID_DESC);
155	MODULE_PARM(snd_enable, "1-" __MODULE_STRING(SNDRV_CARDS) "l");
156	MODULE_PARM_DESC(snd_enable, "Enable UART16550A chip.");
157	MODULE_PARM_SYNTAX(snd_enable, SNDRV_ENABLE_DESC);
158	MODULE_PARM(snd_port, "1-" __MODULE_STRING(SNDRV_CARDS) "l");
159	MODULE_PARM_DESC(snd_port, "Port # for UART16550A chip.");
160	MODULE_PARM_SYNTAX(snd_port, SNDRV_PORT12_DESC);
161	MODULE_PARM(snd_irq, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
162	MODULE_PARM_DESC(snd_irq, "IRQ # for UART16550A chip.");
163	MODULE_PARM_SYNTAX(snd_irq, SNDRV_IRQ_DESC);
164	MODULE_PARM(snd_speed, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
165	MODULE_PARM_DESC(snd_speed, "Speed in bauds.");
166	MODULE_PARM_SYNTAX(snd_speed, SNDRV_ENABLED ",allows:{9600,19200,38400,57600,115200},dialog:list");
167	MODULE_PARM(snd_base, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
168	MODULE_PARM_DESC(snd_base, "Base for divisor in bauds.");
169	MODULE_PARM_SYNTAX(snd_base, SNDRV_ENABLED ",allows:{57600,115200,230400,460800},dialog:list");
170	MODULE_PARM(snd_outs, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
171	MODULE_PARM_DESC(snd_outs, "Number of MIDI outputs.");
172	MODULE_PARM_SYNTAX(snd_outs, SNDRV_ENABLED ",allows:{{1,16}},dialog:list");
173	MODULE_PARM(snd_adaptor, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
174	MODULE_PARM_DESC(snd_adaptor, "Type of adaptor.");
175	MODULE_PARM_SYNTAX(snd_adaptor, SNDRV_ENABLED ",allows:{{0=Soundcanvas,1=MS-124T,2=MS-124W S/A,3=MS-124W M/B}},dialog:list");
176
177	/#define SNDRV_SERIAL_MS124W_MB_NOCOMBO 1/ /* Address outs as 0-3 instead of bitmap */
178
179	#define SNDRV_SERIAL_MAX_OUTS 16 /* max 64, min 16 */
180
181	#define TX_BUFF_SIZE (1<<9) /* Must be 2^n */
182	#define TX_BUFF_MASK (TX_BUFF_SIZE - 1)
183
184	#define SERIAL_MODE_NOT_OPENED (0)
185	#define SERIAL_MODE_INPUT_OPEN (1 << 0)
186	#define SERIAL_MODE_OUTPUT_OPEN (1 << 1)
187	#define SERIAL_MODE_INPUT_TRIGGERED (1 << 2)
188	#define SERIAL_MODE_OUTPUT_TRIGGERED (1 << 3)
189
190	typedef struct _snd_uart16550 {
191	snd_card_t *card;
192	snd_rawmidi_t *rmidi;
193	snd_rawmidi_substream_t *midi_output[SNDRV_SERIAL_MAX_OUTS];
194	snd_rawmidi_substream_t *midi_input;
195
196	int filemode; //open status of file
197
198	spinlock_t open_lock;
199
200	int irq;
201
202	unsigned long base;
203	struct resource *res_base;
204
205	unsigned int speed;
206	unsigned int speed_base;
207	unsigned char divisor;
208
209	unsigned char old_divisor_lsb;
210	unsigned char old_divisor_msb;
211	unsigned char old_line_ctrl_reg;
212
213	// parameter for using of write loop
214	short int fifo_limit; //used in uart16550
215	short int fifo_count; //used in uart16550
216
217	// type of adaptor
218	int adaptor;
219
220	// outputs
221	int prev_out;
222	unsigned char prev_status[SNDRV_SERIAL_MAX_OUTS];
223
224	// write buffer and its writing/reading position
225	unsigned char tx_buff[TX_BUFF_SIZE];
226	int buff_in_count;
227	int buff_in;
228	int buff_out;
229
230	// wait timer
231	unsigned int timer_running:1;
232	struct timer_list buffer_timer;
233
234	} snd_uart16550_t;
235
236	static snd_card_t *snd_serial_cards[SNDRV_CARDS] = SNDRV_DEFAULT_PTR;
237
238	inline static void snd_uart16550_add_timer(snd_uart16550_t *uart)
239	{
240	if (! uart->timer_running) {
241	/* timer 38600bps * 10bit * 16byte */
242	uart->buffer_timer.expires = jiffies + (HZ+255)/256;
243	uart->timer_running = 1;
244	add_timer(&uart->buffer_timer);
245	}
246	}
247
248	inline static void snd_uart16550_del_timer(snd_uart16550_t *uart)
249	{
250	if (uart->timer_running) {
251	del_timer(&uart->buffer_timer);
252	uart->timer_running = 0;
253	}
254	}
255
256	/* This macro is only used in snd_uart16550_io_loop */
257	inline static void snd_uart16550_buffer_output(snd_uart16550_t *uart)
258	{
259	unsigned short buff_out = uart->buff_out;
260	outb(uart->tx_buff[buff_out], uart->base + UART_TX);
261	uart->fifo_count++;
262	buff_out++;
263	buff_out &= TX_BUFF_MASK;
264	uart->buff_out = buff_out;
265	uart->buff_in_count--;
266	}
267
268	/* This loop should be called with interrupts disabled
269	* We don't want to interrupt this,
270	* as we're already handling an interupt
271	*/
272	static void snd_uart16550_io_loop(snd_uart16550_t * uart)
273	{
274	unsigned char c, status;
275
276	/* Read Loop */
277	while ((status = inb(uart->base + UART_LSR)) & UART_LSR_DR) {
278	/* while receive data ready */
279	c = inb(uart->base + UART_RX);
280	if (uart->filemode & SERIAL_MODE_INPUT_OPEN) {
281	snd_rawmidi_receive(uart->midi_input, &c, 1);
282	}
283	if (status & UART_LSR_OE)
284	snd_printk("%s: Overrun on device at 0x%lx\n",
285	uart->rmidi->name, uart->base);
286	}
287
288	/* no need of check SERIAL_MODE_OUTPUT_OPEN because if not,
289	buffer is never filled. */
290	/* Check write status */
291	if (status & UART_LSR_THRE) {
292	uart->fifo_count = 0;
293	}
294	if (uart->adaptor == SNDRV_SERIAL_MS124W_SA) {
295	/* Can't use FIFO, must send only when CTS is true */
296	status = inb(uart->base + UART_MSR);
297	if (uart->fifo_count == 0 && (status & UART_MSR_CTS)
298	&& uart->buff_in_count > 0)
299	snd_uart16550_buffer_output(uart);
300	} else {
301	/* Write loop */
302	while (uart->fifo_count < uart->fifo_limit /* Can we write ? */
303	&& uart->buff_in_count > 0) /* Do we want to? */
304	snd_uart16550_buffer_output(uart);
305	}
306	if (uart->irq < 0 && uart->buff_in_count > 0)
307	snd_uart16550_add_timer(uart);
308	}
309
310	/* NOTES ON SERVICING INTERUPTS
311	* ---------------------------
312	* After receiving a interrupt, it is important to indicate to the UART that
313	* this has been done.
314	* For a Rx interupt, this is done by reading the received byte.
315	* For a Tx interupt this is done by either:
316	* a) Writing a byte
317	* b) Reading the IIR
318	* It is particularly important to read the IIR if a Tx interupt is received
319	* when there is no data in tx_buff[], as in this case there no other
320	* indication that the interupt has been serviced, and it remains outstanding
321	* indefinitely. This has the curious side effect that and no further interupts
322	* will be generated from this device AT ALL!!.
323	* It is also desirable to clear outstanding interupts when the device is
324	* opened/closed.
325	*
326	*
327	* Note that some devices need OUT2 to be set before they will generate
328	* interrupts at all. (Possibly tied to an internal pull-up on CTS?)
329	*/
330	static irqreturn_t snd_uart16550_interrupt(int irq, void dev_id, struct pt_regs regs)
331	{
332	snd_uart16550_t *uart;
333
334	uart = (snd_uart16550_t *) dev_id;
335	spin_lock(&uart->open_lock);
336	if (uart->filemode == SERIAL_MODE_NOT_OPENED) {
337	spin_unlock(&uart->open_lock);
338	return IRQ_HANDLED;
339	}
340	inb(uart->base + UART_IIR); /* indicate to the UART that the interupt has been serviced */
341	snd_uart16550_io_loop(uart);
342	spin_unlock(&uart->open_lock);
343	return IRQ_HANDLED;
344	}
345
346	/* When the polling mode, this function calls snd_uart16550_io_loop. */
347	static void snd_uart16550_buffer_timer(unsigned long data)
348	{
349	snd_uart16550_t *uart;
350
351	uart = (snd_uart16550_t *)data;
352	spin_lock(&uart->open_lock);
353	snd_uart16550_del_timer(uart);
354	snd_uart16550_io_loop(uart);
355	spin_unlock(&uart->open_lock);
356	}
357
358	/*
359	* this method probes, if an uart sits on given port
360	* return 0 if found
361	* return negative error if not found
362	*/
363	static int __init snd_uart16550_detect(unsigned int io_base)
364	{
365	int ok;
366	unsigned char c;
367
368	if (check_region(io_base, 8))
369	return -EBUSY;
370
371	/* Do some vague tests for the presence of the uart */
372	if (io_base == 0)
373	return -ENODEV; /* Not configured */
374
375	ok = 1; /* uart detected unless one of the following tests should fail */
376	/* 8 data-bits, 1 stop-bit, parity off, DLAB = 0 */
377	outb(UART_LCR_WLEN8, io_base + UART_LCR); /* Line Control Register */
378	c = inb(io_base + UART_IER);
379	/* The top four bits of the IER should always == 0 */
380	if ((c & 0xf0) != 0)
381	ok = 0; /* failed */
382
383	outb(0xaa, io_base + UART_SCR);
384	/* Write arbitrary data into the scratch reg */
385	c = inb(io_base + UART_SCR);
386	/* If it comes back, it's OK */
387	if (c != 0xaa)
388	ok = 0; /* failed */
389
390	outb(0x55, io_base + UART_SCR);
391	/* Write arbitrary data into the scratch reg */
392	c = inb(io_base + UART_SCR);
393	/* If it comes back, it's OK */
394	if (c != 0x55)
395	ok = 0; /* failed */
396
397	return ok;
398	}
399
400	static void snd_uart16550_do_open(snd_uart16550_t * uart)
401	{
402	char byte;
403
404	/* Initialize basic variables */
405	uart->buff_in_count = 0;
406	uart->buff_in = 0;
407	uart->buff_out = 0;
408	uart->fifo_limit = 1;
409	uart->fifo_count = 0;
410	uart->timer_running = 0;
411
412	outb(UART_FCR_ENABLE_FIFO /* Enable FIFO's (if available) */
413	\| UART_FCR_CLEAR_RCVR /* Clear receiver FIFO */
414	\| UART_FCR_CLEAR_XMIT /* Clear transmitter FIFO */
415	\| UART_FCR_TRIGGER_4 /* Set FIFO trigger at 4-bytes */
416	/* NOTE: interupt generated after T=(time)4-bytes
417	* if less than UART_FCR_TRIGGER bytes received
418	*/
419	,uart->base + UART_FCR); /* FIFO Control Register */
420
421	if ((inb(uart->base + UART_IIR) & 0xf0) == 0xc0)
422	uart->fifo_limit = 16;
423	if (uart->divisor != 0) {
424	uart->old_line_ctrl_reg = inb(uart->base + UART_LCR);
425	outb(UART_LCR_DLAB /* Divisor latch access bit */
426	,uart->base + UART_LCR); /* Line Control Register */
427	uart->old_divisor_lsb = inb(uart->base + UART_DLL);
428	uart->old_divisor_msb = inb(uart->base + UART_DLM);
429
430	outb(uart->divisor
431	,uart->base + UART_DLL); /* Divisor Latch Low */
432	outb(0
433	,uart->base + UART_DLM); /* Divisor Latch High */
434	/* DLAB is reset to 0 in next outb() */
435	}
436	/* Set serial parameters (parity off, etc) */
437	outb(UART_LCR_WLEN8 /* 8 data-bits */
438	\| 0 /* 1 stop-bit */
439	\| 0 /* parity off */
440	\| 0 /* DLAB = 0 */
441	,uart->base + UART_LCR); /* Line Control Register */
442
443	switch (uart->adaptor) {
444	default:
445	outb(UART_MCR_RTS /* Set Request-To-Send line active */
446	\| UART_MCR_DTR /* Set Data-Terminal-Ready line active */
447	\| UART_MCR_OUT2 /* Set OUT2 - not always required, but when
448	* it is, it is ESSENTIAL for enabling interrupts
449	*/
450	,uart->base + UART_MCR); /* Modem Control Register */
451	break;
452	case SNDRV_SERIAL_MS124W_SA:
453	case SNDRV_SERIAL_MS124W_MB:
454	/* MS-124W can draw power from RTS and DTR if they
455	are in opposite states. */
456	outb(UART_MCR_RTS \| (0&UART_MCR_DTR) \| UART_MCR_OUT2,
457	uart->base + UART_MCR);
458	break;
459	case SNDRV_SERIAL_MS124T:
460	/* MS-124T can draw power from RTS and/or DTR (preferably
461	both) if they are both asserted. */
462	outb(UART_MCR_RTS \| UART_MCR_DTR \| UART_MCR_OUT2,
463	uart->base + UART_MCR);
464	break;
465	}
466
467	if (uart->irq < 0) {
468	byte = (0 & UART_IER_RDI) /* Disable Receiver data interupt */
469	\|(0 & UART_IER_THRI) /* Disable Transmitter holding register empty interupt */
470	;
471	} else if (uart->adaptor == SNDRV_SERIAL_MS124W_SA) {
472	byte = UART_IER_RDI /* Enable Receiver data interrupt */
473	\| UART_IER_MSI /* Enable Modem status interrupt */
474	;
475	} else {
476	byte = UART_IER_RDI /* Enable Receiver data interupt */
477	\| UART_IER_THRI /* Enable Transmitter holding register empty interupt */
478	;
479	}
480	outb(byte, uart->base + UART_IER); /* Interupt enable Register */
481
482	inb(uart->base + UART_LSR); /* Clear any pre-existing overrun indication */
483	inb(uart->base + UART_IIR); /* Clear any pre-existing transmit interrupt */
484	inb(uart->base + UART_RX); /* Clear any pre-existing receive interrupt */
485	}
486
487	static void snd_uart16550_do_close(snd_uart16550_t * uart)
488	{
489	if (uart->irq < 0)
490	snd_uart16550_del_timer(uart);
491
492	/* NOTE: may need to disable interrupts before de-registering out handler.
493	* For now, the consequences are harmless.
494	*/
495
496	outb((0 & UART_IER_RDI) /* Disable Receiver data interupt */
497	\|(0 & UART_IER_THRI) /* Disable Transmitter holding register empty interupt */
498	,uart->base + UART_IER); /* Interupt enable Register */
499
500	switch (uart->adaptor) {
501	default:
502	outb((0 & UART_MCR_RTS) /* Deactivate Request-To-Send line */
503	\|(0 & UART_MCR_DTR) /* Deactivate Data-Terminal-Ready line */
504	\|(0 & UART_MCR_OUT2) /* Deactivate OUT2 */
505	,uart->base + UART_MCR); /* Modem Control Register */
506	break;
507	case SNDRV_SERIAL_MS124W_SA:
508	case SNDRV_SERIAL_MS124W_MB:
509	/* MS-124W can draw power from RTS and DTR if they
510	are in opposite states; leave it powered. */
511	outb(UART_MCR_RTS \| (0&UART_MCR_DTR) \| (0&UART_MCR_OUT2),
512	uart->base + UART_MCR);
513	break;
514	case SNDRV_SERIAL_MS124T:
515	/* MS-124T can draw power from RTS and/or DTR (preferably
516	both) if they are both asserted; leave it powered. */
517	outb(UART_MCR_RTS \| UART_MCR_DTR \| (0&UART_MCR_OUT2),
518	uart->base + UART_MCR);
519	break;
520	}
521
522	inb(uart->base + UART_IIR); /* Clear any outstanding interupts */
523
524	/* Restore old divisor */
525	if (uart->divisor != 0) {
526	outb(UART_LCR_DLAB /* Divisor latch access bit */
527	,uart->base + UART_LCR); /* Line Control Register */
528	outb(uart->old_divisor_lsb
529	,uart->base + UART_DLL); /* Divisor Latch Low */
530	outb(uart->old_divisor_msb
531	,uart->base + UART_DLM); /* Divisor Latch High */
532	/* Restore old LCR (data bits, stop bits, parity, DLAB) */
533	outb(uart->old_line_ctrl_reg
534	,uart->base + UART_LCR); /* Line Control Register */
535	}
536	}
537
538	static int snd_uart16550_input_open(snd_rawmidi_substream_t * substream)
539	{
540	unsigned long flags;
541	snd_uart16550_t *uart = substream->rmidi->private_data;
542
543	spin_lock_irqsave(&uart->open_lock, flags);
544	if (uart->filemode == SERIAL_MODE_NOT_OPENED)
545	snd_uart16550_do_open(uart);
546	uart->filemode \|= SERIAL_MODE_INPUT_OPEN;
547	uart->midi_input = substream;
548	spin_unlock_irqrestore(&uart->open_lock, flags);
549	return 0;
550	}
551
552	static int snd_uart16550_input_close(snd_rawmidi_substream_t * substream)
553	{
554	unsigned long flags;
555	snd_uart16550_t *uart = substream->rmidi->private_data;
556
557	spin_lock_irqsave(&uart->open_lock, flags);
558	uart->filemode &= ~SERIAL_MODE_INPUT_OPEN;
559	uart->midi_input = NULL;
560	if (uart->filemode == SERIAL_MODE_NOT_OPENED)
561	snd_uart16550_do_close(uart);
562	spin_unlock_irqrestore(&uart->open_lock, flags);
563	return 0;
564	}
565
566	static void snd_uart16550_input_trigger(snd_rawmidi_substream_t * substream, int up)
567	{
568	unsigned long flags;
569	snd_uart16550_t *uart = substream->rmidi->private_data;
570
571	spin_lock_irqsave(&uart->open_lock, flags);
572	if (up) {
573	uart->filemode \|= SERIAL_MODE_INPUT_TRIGGERED;
574	} else {
575	uart->filemode &= ~SERIAL_MODE_INPUT_TRIGGERED;
576	}
577	spin_unlock_irqrestore(&uart->open_lock, flags);
578	}
579
580	static int snd_uart16550_output_open(snd_rawmidi_substream_t * substream)
581	{
582	unsigned long flags;
583	snd_uart16550_t *uart = substream->rmidi->private_data;
584
585	spin_lock_irqsave(&uart->open_lock, flags);
586	if (uart->filemode == SERIAL_MODE_NOT_OPENED)
587	snd_uart16550_do_open(uart);
588	uart->filemode \|= SERIAL_MODE_OUTPUT_OPEN;
589	uart->midi_output[substream->number] = substream;
590	spin_unlock_irqrestore(&uart->open_lock, flags);
591	return 0;
592	};
593
594	static int snd_uart16550_output_close(snd_rawmidi_substream_t * substream)
595	{
596	unsigned long flags;
597	snd_uart16550_t *uart = substream->rmidi->private_data;
598
599	spin_lock_irqsave(&uart->open_lock, flags);
600	uart->filemode &= ~SERIAL_MODE_OUTPUT_OPEN;
601	uart->midi_output[substream->number] = NULL;
602	if (uart->filemode == SERIAL_MODE_NOT_OPENED)
603	snd_uart16550_do_close(uart);
604	spin_unlock_irqrestore(&uart->open_lock, flags);
605	return 0;
606	};
607
608	inline static void snd_uart16550_write_buffer(snd_uart16550_t *uart, unsigned char byte)
609	{
610	unsigned short buff_in = uart->buff_in;
611	uart->tx_buff[buff_in] = byte;
612	buff_in++;
613	buff_in &= TX_BUFF_MASK;
614	uart->buff_in = buff_in;
615	uart->buff_in_count++;
616	if (uart->irq < 0) /* polling mode */
617	snd_uart16550_add_timer(uart);
618	}
619
620	static void snd_uart16550_output_byte(snd_uart16550_t uart, snd_rawmidi_substream_t substream, unsigned char midi_byte)
621	{
622	if (uart->buff_in_count == 0 /* Buffer empty? */
623	&& (uart->adaptor != SNDRV_SERIAL_MS124W_SA \|\|
624	(uart->fifo_count == 0 /* FIFO empty? */
625	&& (inb(uart->base + UART_MSR) & UART_MSR_CTS)))) { /* CTS? */
626
627	/* Tx Buffer Empty - try to write immediately */
628	if ((inb(uart->base + UART_LSR) & UART_LSR_THRE) != 0) {
629	/* Transmitter holding register (and Tx FIFO) empty */
630	uart->fifo_count = 1;
631	outb(midi_byte, uart->base + UART_TX);
632	} else {
633	if (uart->fifo_count < uart->fifo_limit) {
634	uart->fifo_count++;
635	outb(midi_byte, uart->base + UART_TX);
636	} else {
637	/* Cannot write (buffer empty) - put char in buffer */
638	snd_uart16550_write_buffer(uart, midi_byte);
639	}
640	}
641	} else {
642	if (uart->buff_in_count >= TX_BUFF_SIZE) {
643	snd_printk("%s: Buffer overrun on device at 0x%lx\n",
644	uart->rmidi->name, uart->base);
645	return;
646	}
647	snd_uart16550_write_buffer(uart, midi_byte);
648	}
649	}
650
651	static void snd_uart16550_output_write(snd_rawmidi_substream_t * substream)
652	{
653	unsigned long flags;
654	unsigned char midi_byte, addr_byte;
655	snd_uart16550_t *uart = substream->rmidi->private_data;
656	char first;
657
658	/* Interupts 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	#if 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) addr_byte = 0xf8;
684	#endif
685	snd_uart16550_output_byte(uart, substream, addr_byte);
686	/* send midi byte */
687	snd_uart16550_output_byte(uart, substream, midi_byte);
688	}
689	} else {
690	first = 0;
691	while (1) {
692	/* buffer full? */
693	if (uart->buff_in_count >= TX_BUFF_SIZE)
694	break;
695	if (snd_rawmidi_transmit(substream, &midi_byte, 1) != 1)
696	break;
697	if (first == 0 && uart->adaptor == SNDRV_SERIAL_SOUNDCANVAS &&
698	uart->prev_out != substream->number) {
699	/* Roland Soundcanvas part selection */
700	/* If this substream of the data is different previous
701	substream in this uart, send the change part event */
702	uart->prev_out = substream->number;
703	/* change part */
704	snd_uart16550_output_byte(uart, substream, 0xf5);
705	/* data */
706	snd_uart16550_output_byte(uart, substream, uart->prev_out + 1);
707	/* If midi_byte is a data byte, send the previous status byte */
708	if (midi_byte < 0x80)
709	snd_uart16550_output_byte(uart, substream, uart->prev_status[uart->prev_out]);
710	}
711	/* send midi byte */
712	snd_uart16550_output_byte(uart, substream, midi_byte);
713	if (midi_byte >= 0x80 && midi_byte < 0xf0)
714	uart->prev_status[uart->prev_out] = midi_byte;
715	first = 1;
716	}
717	}
718	spin_unlock_irqrestore(&uart->open_lock, flags);
719	}
720
721	static void snd_uart16550_output_trigger(snd_rawmidi_substream_t * substream, int up)
722	{
723	unsigned long flags;
724	snd_uart16550_t *uart = substream->rmidi->private_data;
725
726	spin_lock_irqsave(&uart->open_lock, flags);
727	if (up) {
728	uart->filemode \|= SERIAL_MODE_OUTPUT_TRIGGERED;
729	} else {
730	uart->filemode &= ~SERIAL_MODE_OUTPUT_TRIGGERED;
731	}
732	spin_unlock_irqrestore(&uart->open_lock, flags);
733	if (up)
734	snd_uart16550_output_write(substream);
735	}
736
737	#ifdef TARGET_OS2
738	static snd_rawmidi_ops_t snd_uart16550_output =
739	{
740	snd_uart16550_output_open,
741	snd_uart16550_output_close,
742	snd_uart16550_output_trigger,0
743	};
744
745	static snd_rawmidi_ops_t snd_uart16550_input =
746	{
747	snd_uart16550_input_open,
748	snd_uart16550_input_close,
749	snd_uart16550_input_trigger,0
750	};
751	#else
752	static snd_rawmidi_ops_t snd_uart16550_output =
753	{
754	open: snd_uart16550_output_open,
755	close: snd_uart16550_output_close,
756	trigger: snd_uart16550_output_trigger,
757	};
758
759	static snd_rawmidi_ops_t snd_uart16550_input =
760	{
761	open: snd_uart16550_input_open,
762	close: snd_uart16550_input_close,
763	trigger: snd_uart16550_input_trigger,
764	};
765	#endif
766
767	static int snd_uart16550_free(snd_uart16550_t *uart)
768	{
769	if (uart->irq >= 0)
770	free_irq(uart->irq, (void *)uart);
771	if (uart->res_base)
772	release_resource(uart->res_base);
773	kfree(uart);
774	return 0;
775	};
776
777	static int snd_uart16550_dev_free(snd_device_t *device)
778	{
779	snd_uart16550_t *uart = device->device_data;
780	return snd_uart16550_free(uart);
781	}
782
783	static int __init snd_uart16550_create(snd_card_t * card,
784	unsigned long iobase,
785	int irq,
786	unsigned int speed,
787	unsigned int base,
788	int adaptor,
789	snd_uart16550_t **ruart)
790	{
791	#ifdef TARGET_OS2
792	static snd_device_ops_t ops = {
793	snd_uart16550_dev_free,0,0,0
794	};
795	#else
796	static snd_device_ops_t ops = {
797	dev_free: snd_uart16550_dev_free,
798	};
799	#endif
800	snd_uart16550_t *uart;
801	int err;
802
803
804	if ((uart = kcalloc(1, sizeof(*uart), GFP_KERNEL)) == NULL)
805	return -ENOMEM;
806	uart->adaptor = adaptor;
807	uart->card = card;
808	spin_lock_init(&uart->open_lock);
809	uart->irq = -1;
810	if ((uart->res_base = request_region(iobase, 8, "Serial MIDI")) == NULL) {
811	snd_printk("unable to grab ports 0x%lx-0x%lx\n", iobase, iobase + 8 - 1);
812	return -EBUSY;
813	}
814	uart->base = iobase;
815	if (irq >= 0) {
816	if (request_irq(irq, snd_uart16550_interrupt,
817	SA_INTERRUPT, "Serial MIDI", (void *) uart)) {
818	uart->irq = -1;
819	snd_printk("irq %d busy. Using Polling.\n", irq);
820	} else {
821	uart->irq = irq;
822	}
823	}
824	uart->divisor = base / speed;
825	uart->speed = base / (unsigned int)uart->divisor;
826	uart->speed_base = base;
827	uart->prev_out = -1;
828	memset(uart->prev_status, 0x80, sizeof(unsigned char) * SNDRV_SERIAL_MAX_OUTS);
829	uart->buffer_timer.function = snd_uart16550_buffer_timer;
830	uart->buffer_timer.data = (unsigned long)uart;
831	uart->timer_running = 0;
832
833	/* Register device */
834	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, uart, &ops)) < 0) {
835	snd_uart16550_free(uart);
836	return err;
837	}
838
839	switch (uart->adaptor) {
840	case SNDRV_SERIAL_MS124W_SA:
841	case SNDRV_SERIAL_MS124W_MB:
842	/* MS-124W can draw power from RTS and DTR if they
843	are in opposite states. */
844	outb(UART_MCR_RTS \| (0&UART_MCR_DTR), uart->base + UART_MCR);
845	break;
846	case SNDRV_SERIAL_MS124T:
847	/* MS-124T can draw power from RTS and/or DTR (preferably
848	both) if they are asserted. */
849	outb(UART_MCR_RTS \| UART_MCR_DTR, uart->base + UART_MCR);
850	break;
851	default:
852	break;
853	}
854
855	if (ruart)
856	*ruart = uart;
857
858	return 0;
859	}
860
861	static int __init snd_uart16550_rmidi(snd_uart16550_t uart, int device, int outs, snd_rawmidi_t *rmidi)
862	{
863	snd_rawmidi_t *rrawmidi;
864	int err;
865
866	if ((err = snd_rawmidi_new(uart->card, "UART Serial MIDI", device, outs, 1, &rrawmidi)) < 0)
867	return err;
868	snd_rawmidi_set_ops(rrawmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_uart16550_input);
869	snd_rawmidi_set_ops(rrawmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_uart16550_output);
870	sprintf(rrawmidi->name, "uart16550 MIDI #%d", device);
871	rrawmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT \|
872	SNDRV_RAWMIDI_INFO_INPUT \|
873	SNDRV_RAWMIDI_INFO_DUPLEX;
874	rrawmidi->private_data = uart;
875	if (rmidi)
876	*rmidi = rrawmidi;
877	return 0;
878	}
879
880	static int __init snd_serial_probe(int dev)
881	{
882	snd_card_t *card;
883	snd_uart16550_t *uart;
884	int err;
885
886	if (!snd_enable[dev])
887	return -ENOENT;
888
889	switch (snd_adaptor[dev]) {
890	case SNDRV_SERIAL_SOUNDCANVAS:
891	break;
892	case SNDRV_SERIAL_MS124T:
893	case SNDRV_SERIAL_MS124W_SA:
894	snd_outs[dev] = 1;
895	break;
896	case SNDRV_SERIAL_MS124W_MB:
897	snd_outs[dev] = 16;
898	break;
899	default:
900	snd_printk("Adaptor type is out of range 0-%d (%d)\n",
901	SNDRV_SERIAL_MAX_ADAPTOR, snd_adaptor[dev]);
902	return -ENODEV;
903	}
904
905	if (snd_outs[dev] < 1 \|\| snd_outs[dev] > SNDRV_SERIAL_MAX_OUTS) {
906	snd_printk("Count of outputs is out of range 1-%d (%d)\n",
907	SNDRV_SERIAL_MAX_OUTS, snd_outs[dev]);
908	return -ENODEV;
909	}
910
911	card = snd_card_new(snd_index[dev], snd_id[dev], THIS_MODULE, 0);
912	if (card == NULL)
913	return -ENOMEM;
914
915	strcpy(card->driver, "Serial");
916	strcpy(card->shortname, "Serial midi (uart16550A)");
917
918	if ((err = snd_uart16550_detect(snd_port[dev])) <= 0) {
919	snd_card_free(card);
920	snd_printk("no UART detected at 0x%lx\n", (long)snd_port[dev]);
921	return err;
922	}
923
924	if ((err = snd_uart16550_create(card,
925	snd_port[dev],
926	snd_irq[dev],
927	snd_speed[dev],
928	snd_base[dev],
929	snd_adaptor[dev],
930	&uart)) < 0) {
931	snd_card_free(card);
932	return err;
933	}
934
935	if ((err = snd_uart16550_rmidi(uart, 0, snd_outs[dev], &uart->rmidi)) < 0) {
936	snd_card_free(card);
937	return err;
938	}
939
940	sprintf(card->longname, "%s at 0x%lx, irq %d speed %d div %d outs %d adaptor %s",
941	card->shortname,
942	uart->base,
943	uart->irq,
944	uart->speed,
945	(int)uart->divisor,
946	snd_outs[dev],
947	adaptor_names[uart->adaptor]);
948
949	if ((err = snd_card_register(card)) < 0) {
950	snd_card_free(card);
951	return err;
952	}
953	snd_serial_cards[dev] = card;
954	return 0;
955	}
956
957	static int __init alsa_card_serial_init(void)
958	{
959	int dev = 0;
960	int cards = 0;
961
962	for (dev = 0; dev < SNDRV_CARDS; dev++) {
963	if (snd_serial_probe(dev) == 0)
964	cards++;
965	}
966
967	if (cards == 0) {
968	#ifdef MODULE
969	snd_printk("serial midi soundcard not found or device busy\n");
970	#endif
971	return -ENODEV;
972	}
973	return 0;
974	}
975
976	static void __exit alsa_card_serial_exit(void)
977	{
978	int dev;
979
980	for (dev = 0; dev < SNDRV_CARDS; dev++) {
981	if (snd_serial_cards[dev] != NULL)
982	snd_card_free(snd_serial_cards[dev]);
983	}
984	}
985
986	module_init(alsa_card_serial_init)
987	module_exit(alsa_card_serial_exit)
988
989	#ifndef MODULE
990
991	/* format is: snd-card-serial=snd_enable,snd_index,snd_id,
992	snd_port,snd_irq,snd_speed,snd_base,snd_outs */
993
994	static int __init alsa_card_serial_setup(char *str)
995	{
996	static unsigned __initdata nr_dev = 0;
997
998	if (nr_dev >= SNDRV_CARDS)
999	return 0;
1000	(void)(get_option(&str,&snd_enable[nr_dev]) == 2 &&
1001	get_option(&str,&snd_index[nr_dev]) == 2 &&
1002	get_id(&str,&snd_id[nr_dev]) == 2 &&
1003	get_option(&str,(int *)&snd_port[nr_dev]) == 2 &&
1004	get_option(&str,&snd_irq[nr_dev]) == 2 &&
1005	get_option(&str,&snd_speed[nr_dev]) == 2 &&
1006	get_option(&str,&snd_base[nr_dev]) == 2 &&
1007	get_option(&str,&snd_outs[nr_dev]) == 2 &&
1008	get_option(&str,&snd_adaptor[nr_dev]) == 2);
1009	nr_dev++;
1010	return 1;
1011	}
1012
1013	__setup("snd-card-serial=", alsa_card_serial_setup);
1014
1015	#endif /* ifndef MODULE */

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