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[TG3]: Set minimal hw interrupt mitigation.
[linux-2.6/verdex.git] / sound / drivers / serial-u16550.c
blob964b97e70c846350d804abd29d0c91e4f6ab414a
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 * 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 <sound/driver.h>
34 #include <linux/init.h>
35 #include <linux/interrupt.h>
36 #include <linux/slab.h>
37 #include <linux/ioport.h>
38 #include <linux/moduleparam.h>
39 #include <sound/core.h>
40 #include <sound/rawmidi.h>
41 #include <sound/initval.h>
42
43 #include <linux/serial_reg.h>
44
45 #include <asm/io.h>
46
47 MODULE_DESCRIPTION("MIDI serial u16550");
48 MODULE_LICENSE("GPL");
49 MODULE_SUPPORTED_DEVICE("{{ALSA, MIDI serial u16550}}");
50
51 #define SNDRV_SERIAL_SOUNDCANVAS 0 /* Roland Soundcanvas; F5 NN selects part */
52 #define SNDRV_SERIAL_MS124T 1 /* Midiator MS-124T */
53 #define SNDRV_SERIAL_MS124W_SA 2 /* Midiator MS-124W in S/A mode */
54 #define SNDRV_SERIAL_MS124W_MB 3 /* Midiator MS-124W in M/B mode */
55 #define SNDRV_SERIAL_GENERIC 4 /* Generic Interface */
56 #define SNDRV_SERIAL_MAX_ADAPTOR SNDRV_SERIAL_GENERIC
57 static char *adaptor_names[] = {
58 "Soundcanvas",
59 "MS-124T",
60 "MS-124W S/A",
61 "MS-124W M/B",
62 "Generic"
63 };
64
65 #define SNDRV_SERIAL_NORMALBUFF 0 /* Normal blocking buffer operation */
66 #define SNDRV_SERIAL_DROPBUFF 1 /* Non-blocking discard operation */
67
68 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
69 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
70 static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE; /* Enable this card */
71 static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT; /* 0x3f8,0x2f8,0x3e8,0x2e8 */
72 static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ; /* 3,4,5,7,9,10,11,14,15 */
73 static int speed[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 38400}; /* 9600,19200,38400,57600,115200 */
74 static int base[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 115200}; /* baud base */
75 static int outs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; /* 1 to 16 */
76 static int ins[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; /* 1 to 16 */
77 static int adaptor[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = SNDRV_SERIAL_SOUNDCANVAS};
78 static int droponfull[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS -1)] = SNDRV_SERIAL_NORMALBUFF };
79
80 module_param_array(index, int, NULL, 0444);
81 MODULE_PARM_DESC(index, "Index value for Serial MIDI.");
82 module_param_array(id, charp, NULL, 0444);
83 MODULE_PARM_DESC(id, "ID string for Serial MIDI.");
84 module_param_array(enable, bool, NULL, 0444);
85 MODULE_PARM_DESC(enable, "Enable UART16550A chip.");
86 module_param_array(port, long, NULL, 0444);
87 MODULE_PARM_DESC(port, "Port # for UART16550A chip.");
88 module_param_array(irq, int, NULL, 0444);
89 MODULE_PARM_DESC(irq, "IRQ # for UART16550A chip.");
90 module_param_array(speed, int, NULL, 0444);
91 MODULE_PARM_DESC(speed, "Speed in bauds.");
92 module_param_array(base, int, NULL, 0444);
93 MODULE_PARM_DESC(base, "Base for divisor in bauds.");
94 module_param_array(outs, int, NULL, 0444);
95 MODULE_PARM_DESC(outs, "Number of MIDI outputs.");
96 module_param_array(ins, int, NULL, 0444);
97 MODULE_PARM_DESC(ins, "Number of MIDI inputs.");
98 module_param_array(droponfull, bool, NULL, 0444);
99 MODULE_PARM_DESC(droponfull, "Flag to enable drop-on-full buffer mode");
100
101 module_param_array(adaptor, int, NULL, 0444);
102 MODULE_PARM_DESC(adaptor, "Type of adaptor.");
103
104 /*#define SNDRV_SERIAL_MS124W_MB_NOCOMBO 1*/ /* Address outs as 0-3 instead of bitmap */
105
106 #define SNDRV_SERIAL_MAX_OUTS 16 /* max 64, min 16 */
107 #define SNDRV_SERIAL_MAX_INS 16 /* max 64, min 16 */
108
109 #define TX_BUFF_SIZE (1<<15) /* Must be 2^n */
110 #define TX_BUFF_MASK (TX_BUFF_SIZE - 1)
111
112 #define SERIAL_MODE_NOT_OPENED (0)
113 #define SERIAL_MODE_INPUT_OPEN (1 << 0)
114 #define SERIAL_MODE_OUTPUT_OPEN (1 << 1)
115 #define SERIAL_MODE_INPUT_TRIGGERED (1 << 2)
116 #define SERIAL_MODE_OUTPUT_TRIGGERED (1 << 3)
117
118 typedef struct _snd_uart16550 {
119 snd_card_t *card;
120 snd_rawmidi_t *rmidi;
121 snd_rawmidi_substream_t *midi_output[SNDRV_SERIAL_MAX_OUTS];
122 snd_rawmidi_substream_t *midi_input[SNDRV_SERIAL_MAX_INS];
123
124 int filemode; //open status of file
125
126 spinlock_t open_lock;
127
128 int irq;
129
130 unsigned long base;
131 struct resource *res_base;
132
133 unsigned int speed;
134 unsigned int speed_base;
135 unsigned char divisor;
136
137 unsigned char old_divisor_lsb;
138 unsigned char old_divisor_msb;
139 unsigned char old_line_ctrl_reg;
140
141 // parameter for using of write loop
142 short int fifo_limit; //used in uart16550
143 short int fifo_count; //used in uart16550
144
145 // type of adaptor
146 int adaptor;
147
148 // inputs
149 int prev_in;
150 unsigned char rstatus;
151
152 // outputs
153 int prev_out;
154 unsigned char prev_status[SNDRV_SERIAL_MAX_OUTS];
155
156 // write buffer and its writing/reading position
157 unsigned char tx_buff[TX_BUFF_SIZE];
158 int buff_in_count;
159 int buff_in;
160 int buff_out;
161 int drop_on_full;
162
163 // wait timer
164 unsigned int timer_running:1;
165 struct timer_list buffer_timer;
166
167 } snd_uart16550_t;
168
169 static snd_card_t *snd_serial_cards[SNDRV_CARDS] = SNDRV_DEFAULT_PTR;
170
171 inline static void snd_uart16550_add_timer(snd_uart16550_t *uart)
172 {
173 if (! uart->timer_running) {
174 /* timer 38600bps * 10bit * 16byte */
175 uart->buffer_timer.expires = jiffies + (HZ+255)/256;
176 uart->timer_running = 1;
177 add_timer(&uart->buffer_timer);
178 }
179 }
180
181 inline static void snd_uart16550_del_timer(snd_uart16550_t *uart)
182 {
183 if (uart->timer_running) {
184 del_timer(&uart->buffer_timer);
185 uart->timer_running = 0;
186 }
187 }
188
189 /* This macro is only used in snd_uart16550_io_loop */
190 inline static void snd_uart16550_buffer_output(snd_uart16550_t *uart)
191 {
192 unsigned short buff_out = uart->buff_out;
193 if( uart->buff_in_count > 0 ) {
194 outb(uart->tx_buff[buff_out], uart->base + UART_TX);
195 uart->fifo_count++;
196 buff_out++;
197 buff_out &= TX_BUFF_MASK;
198 uart->buff_out = buff_out;
199 uart->buff_in_count--;
200 }
201 }
202
203 /* This loop should be called with interrupts disabled
204 * We don't want to interrupt this,
205 * as we're already handling an interrupt
206 */
207 static void snd_uart16550_io_loop(snd_uart16550_t * uart)
208 {
209 unsigned char c, status;
210 int substream;
211
212 /* recall previous stream */
213 substream = uart->prev_in;
214
215 /* Read Loop */
216 while ((status = inb(uart->base + UART_LSR)) & UART_LSR_DR) {
217 /* while receive data ready */
218 c = inb(uart->base + UART_RX);
219
220 /* keep track of last status byte */
221 if (c & 0x80) {
222 uart->rstatus = c;
223 }
224
225 /* handle stream switch */
226 if (uart->adaptor == SNDRV_SERIAL_GENERIC) {
227 if (uart->rstatus == 0xf5) {
228 if (c <= SNDRV_SERIAL_MAX_INS && c > 0)
229 substream = c - 1;
230 if (c != 0xf5)
231 uart->rstatus = 0; /* prevent future bytes from being interpreted as streams */
232 }
233 else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN) && (uart->midi_input[substream] != NULL)) {
234 snd_rawmidi_receive(uart->midi_input[substream], &c, 1);
235 }
236 } else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN) && (uart->midi_input[substream] != NULL)) {
237 snd_rawmidi_receive(uart->midi_input[substream], &c, 1);
238 }
239
240 if (status & UART_LSR_OE)
241 snd_printk("%s: Overrun on device at 0x%lx\n",
242 uart->rmidi->name, uart->base);
243 }
244
245 /* remember the last stream */
246 uart->prev_in = substream;
247
248 /* no need of check SERIAL_MODE_OUTPUT_OPEN because if not,
249 buffer is never filled. */
250 /* Check write status */
251 if (status & UART_LSR_THRE) {
252 uart->fifo_count = 0;
253 }
254 if (uart->adaptor == SNDRV_SERIAL_MS124W_SA
255 || uart->adaptor == SNDRV_SERIAL_GENERIC) {
256 /* Can't use FIFO, must send only when CTS is true */
257 status = inb(uart->base + UART_MSR);
258 while( (uart->fifo_count == 0) && (status & UART_MSR_CTS) &&
259 (uart->buff_in_count > 0) ) {
260 snd_uart16550_buffer_output(uart);
261 status = inb( uart->base + UART_MSR );
262 }
263 } else {
264 /* Write loop */
265 while (uart->fifo_count < uart->fifo_limit /* Can we write ? */
266 && uart->buff_in_count > 0) /* Do we want to? */
267 snd_uart16550_buffer_output(uart);
268 }
269 if (uart->irq < 0 && uart->buff_in_count > 0)
270 snd_uart16550_add_timer(uart);
271 }
272
273 /* NOTES ON SERVICING INTERUPTS
274 * ---------------------------
275 * After receiving a interrupt, it is important to indicate to the UART that
276 * this has been done.
277 * For a Rx interrupt, this is done by reading the received byte.
278 * For a Tx interrupt this is done by either:
279 * a) Writing a byte
280 * b) Reading the IIR
281 * It is particularly important to read the IIR if a Tx interrupt is received
282 * when there is no data in tx_buff[], as in this case there no other
283 * indication that the interrupt has been serviced, and it remains outstanding
284 * indefinitely. This has the curious side effect that and no further interrupts
285 * will be generated from this device AT ALL!!.
286 * It is also desirable to clear outstanding interrupts when the device is
287 * opened/closed.
288 *
289 *
290 * Note that some devices need OUT2 to be set before they will generate
291 * interrupts at all. (Possibly tied to an internal pull-up on CTS?)
292 */
293 static irqreturn_t snd_uart16550_interrupt(int irq, void *dev_id, struct pt_regs *regs)
294 {
295 snd_uart16550_t *uart;
296
297 uart = (snd_uart16550_t *) dev_id;
298 spin_lock(&uart->open_lock);
299 if (uart->filemode == SERIAL_MODE_NOT_OPENED) {
300 spin_unlock(&uart->open_lock);
301 return IRQ_NONE;
302 }
303 inb(uart->base + UART_IIR); /* indicate to the UART that the interrupt has been serviced */
304 snd_uart16550_io_loop(uart);
305 spin_unlock(&uart->open_lock);
306 return IRQ_HANDLED;
307 }
308
309 /* When the polling mode, this function calls snd_uart16550_io_loop. */
310 static void snd_uart16550_buffer_timer(unsigned long data)
311 {
312 unsigned long flags;
313 snd_uart16550_t *uart;
314
315 uart = (snd_uart16550_t *)data;
316 spin_lock_irqsave(&uart->open_lock, flags);
317 snd_uart16550_del_timer(uart);
318 snd_uart16550_io_loop(uart);
319 spin_unlock_irqrestore(&uart->open_lock, flags);
320 }
321
322 /*
323 * this method probes, if an uart sits on given port
324 * return 0 if found
325 * return negative error if not found
326 */
327 static int __init snd_uart16550_detect(snd_uart16550_t *uart)
328 {
329 unsigned long io_base = uart->base;
330 int ok;
331 unsigned char c;
332
333 /* Do some vague tests for the presence of the uart */
334 if (io_base == 0 || io_base == SNDRV_AUTO_PORT) {
335 return -ENODEV; /* Not configured */
336 }
337
338 uart->res_base = request_region(io_base, 8, "Serial MIDI");
339 if (uart->res_base == NULL) {
340 snd_printk(KERN_ERR "u16550: can't grab port 0x%lx\n", io_base);
341 return -EBUSY;
342 }
343
344 ok = 1; /* uart detected unless one of the following tests should fail */
345 /* 8 data-bits, 1 stop-bit, parity off, DLAB = 0 */
346 outb(UART_LCR_WLEN8, io_base + UART_LCR); /* Line Control Register */
347 c = inb(io_base + UART_IER);
348 /* The top four bits of the IER should always == 0 */
349 if ((c & 0xf0) != 0)
350 ok = 0; /* failed */
351
352 outb(0xaa, io_base + UART_SCR);
353 /* Write arbitrary data into the scratch reg */
354 c = inb(io_base + UART_SCR);
355 /* If it comes back, it's OK */
356 if (c != 0xaa)
357 ok = 0; /* failed */
358
359 outb(0x55, io_base + UART_SCR);
360 /* Write arbitrary data into the scratch reg */
361 c = inb(io_base + UART_SCR);
362 /* If it comes back, it's OK */
363 if (c != 0x55)
364 ok = 0; /* failed */
365
366 return ok;
367 }
368
369 static void snd_uart16550_do_open(snd_uart16550_t * uart)
370 {
371 char byte;
372
373 /* Initialize basic variables */
374 uart->buff_in_count = 0;
375 uart->buff_in = 0;
376 uart->buff_out = 0;
377 uart->fifo_limit = 1;
378 uart->fifo_count = 0;
379 uart->timer_running = 0;
380
381 outb(UART_FCR_ENABLE_FIFO /* Enable FIFO's (if available) */
382 | UART_FCR_CLEAR_RCVR /* Clear receiver FIFO */
383 | UART_FCR_CLEAR_XMIT /* Clear transmitter FIFO */
384 | UART_FCR_TRIGGER_4 /* Set FIFO trigger at 4-bytes */
385 /* NOTE: interrupt generated after T=(time)4-bytes
386 * if less than UART_FCR_TRIGGER bytes received
387 */
388 ,uart->base + UART_FCR); /* FIFO Control Register */
389
390 if ((inb(uart->base + UART_IIR) & 0xf0) == 0xc0)
391 uart->fifo_limit = 16;
392 if (uart->divisor != 0) {
393 uart->old_line_ctrl_reg = inb(uart->base + UART_LCR);
394 outb(UART_LCR_DLAB /* Divisor latch access bit */
395 ,uart->base + UART_LCR); /* Line Control Register */
396 uart->old_divisor_lsb = inb(uart->base + UART_DLL);
397 uart->old_divisor_msb = inb(uart->base + UART_DLM);
398
399 outb(uart->divisor
400 ,uart->base + UART_DLL); /* Divisor Latch Low */
401 outb(0
402 ,uart->base + UART_DLM); /* Divisor Latch High */
403 /* DLAB is reset to 0 in next outb() */
404 }
405 /* Set serial parameters (parity off, etc) */
406 outb(UART_LCR_WLEN8 /* 8 data-bits */
407 | 0 /* 1 stop-bit */
408 | 0 /* parity off */
409 | 0 /* DLAB = 0 */
410 ,uart->base + UART_LCR); /* Line Control Register */
411
412 switch (uart->adaptor) {
413 default:
414 outb(UART_MCR_RTS /* Set Request-To-Send line active */
415 | UART_MCR_DTR /* Set Data-Terminal-Ready line active */
416 | UART_MCR_OUT2 /* Set OUT2 - not always required, but when
417 * it is, it is ESSENTIAL for enabling interrupts
418 */
419 ,uart->base + UART_MCR); /* Modem Control Register */
420 break;
421 case SNDRV_SERIAL_MS124W_SA:
422 case SNDRV_SERIAL_MS124W_MB:
423 /* MS-124W can draw power from RTS and DTR if they
424 are in opposite states. */
425 outb(UART_MCR_RTS | (0&UART_MCR_DTR) | UART_MCR_OUT2,
426 uart->base + UART_MCR);
427 break;
428 case SNDRV_SERIAL_MS124T:
429 /* MS-124T can draw power from RTS and/or DTR (preferably
430 both) if they are both asserted. */
431 outb(UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2,
432 uart->base + UART_MCR);
433 break;
434 }
435
436 if (uart->irq < 0) {
437 byte = (0 & UART_IER_RDI) /* Disable Receiver data interrupt */
438 |(0 & UART_IER_THRI) /* Disable Transmitter holding register empty interrupt */
439 ;
440 } else if (uart->adaptor == SNDRV_SERIAL_MS124W_SA) {
441 byte = UART_IER_RDI /* Enable Receiver data interrupt */
442 | UART_IER_MSI /* Enable Modem status interrupt */
443 ;
444 } else if (uart->adaptor == SNDRV_SERIAL_GENERIC) {
445 byte = UART_IER_RDI /* Enable Receiver data interrupt */
446 | UART_IER_MSI /* Enable Modem status interrupt */
447 | UART_IER_THRI /* Enable Transmitter holding register empty interrupt */
448 ;
449 } else {
450 byte = UART_IER_RDI /* Enable Receiver data interrupt */
451 | UART_IER_THRI /* Enable Transmitter holding register empty interrupt */
452 ;
453 }
454 outb(byte, uart->base + UART_IER); /* Interupt enable Register */
455
456 inb(uart->base + UART_LSR); /* Clear any pre-existing overrun indication */
457 inb(uart->base + UART_IIR); /* Clear any pre-existing transmit interrupt */
458 inb(uart->base + UART_RX); /* Clear any pre-existing receive interrupt */
459 }
460
461 static void snd_uart16550_do_close(snd_uart16550_t * uart)
462 {
463 if (uart->irq < 0)
464 snd_uart16550_del_timer(uart);
465
466 /* NOTE: may need to disable interrupts before de-registering out handler.
467 * For now, the consequences are harmless.
468 */
469
470 outb((0 & UART_IER_RDI) /* Disable Receiver data interrupt */
471 |(0 & UART_IER_THRI) /* Disable Transmitter holding register empty interrupt */
472 ,uart->base + UART_IER); /* Interupt enable Register */
473
474 switch (uart->adaptor) {
475 default:
476 outb((0 & UART_MCR_RTS) /* Deactivate Request-To-Send line */
477 |(0 & UART_MCR_DTR) /* Deactivate Data-Terminal-Ready line */
478 |(0 & UART_MCR_OUT2) /* Deactivate OUT2 */
479 ,uart->base + UART_MCR); /* Modem Control Register */
480 break;
481 case SNDRV_SERIAL_MS124W_SA:
482 case SNDRV_SERIAL_MS124W_MB:
483 /* MS-124W can draw power from RTS and DTR if they
484 are in opposite states; leave it powered. */
485 outb(UART_MCR_RTS | (0&UART_MCR_DTR) | (0&UART_MCR_OUT2),
486 uart->base + UART_MCR);
487 break;
488 case SNDRV_SERIAL_MS124T:
489 /* MS-124T can draw power from RTS and/or DTR (preferably
490 both) if they are both asserted; leave it powered. */
491 outb(UART_MCR_RTS | UART_MCR_DTR | (0&UART_MCR_OUT2),
492 uart->base + UART_MCR);
493 break;
494 }
495
496 inb(uart->base + UART_IIR); /* Clear any outstanding interrupts */
497
498 /* Restore old divisor */
499 if (uart->divisor != 0) {
500 outb(UART_LCR_DLAB /* Divisor latch access bit */
501 ,uart->base + UART_LCR); /* Line Control Register */
502 outb(uart->old_divisor_lsb
503 ,uart->base + UART_DLL); /* Divisor Latch Low */
504 outb(uart->old_divisor_msb
505 ,uart->base + UART_DLM); /* Divisor Latch High */
506 /* Restore old LCR (data bits, stop bits, parity, DLAB) */
507 outb(uart->old_line_ctrl_reg
508 ,uart->base + UART_LCR); /* Line Control Register */
509 }
510 }
511
512 static int snd_uart16550_input_open(snd_rawmidi_substream_t * substream)
513 {
514 unsigned long flags;
515 snd_uart16550_t *uart = substream->rmidi->private_data;
516
517 spin_lock_irqsave(&uart->open_lock, flags);
518 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
519 snd_uart16550_do_open(uart);
520 uart->filemode |= SERIAL_MODE_INPUT_OPEN;
521 uart->midi_input[substream->number] = substream;
522 spin_unlock_irqrestore(&uart->open_lock, flags);
523 return 0;
524 }
525
526 static int snd_uart16550_input_close(snd_rawmidi_substream_t * substream)
527 {
528 unsigned long flags;
529 snd_uart16550_t *uart = substream->rmidi->private_data;
530
531 spin_lock_irqsave(&uart->open_lock, flags);
532 uart->filemode &= ~SERIAL_MODE_INPUT_OPEN;
533 uart->midi_input[substream->number] = NULL;
534 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
535 snd_uart16550_do_close(uart);
536 spin_unlock_irqrestore(&uart->open_lock, flags);
537 return 0;
538 }
539
540 static void snd_uart16550_input_trigger(snd_rawmidi_substream_t * substream, int up)
541 {
542 unsigned long flags;
543 snd_uart16550_t *uart = substream->rmidi->private_data;
544
545 spin_lock_irqsave(&uart->open_lock, flags);
546 if (up) {
547 uart->filemode |= SERIAL_MODE_INPUT_TRIGGERED;
548 } else {
549 uart->filemode &= ~SERIAL_MODE_INPUT_TRIGGERED;
550 }
551 spin_unlock_irqrestore(&uart->open_lock, flags);
552 }
553
554 static int snd_uart16550_output_open(snd_rawmidi_substream_t * substream)
555 {
556 unsigned long flags;
557 snd_uart16550_t *uart = substream->rmidi->private_data;
558
559 spin_lock_irqsave(&uart->open_lock, flags);
560 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
561 snd_uart16550_do_open(uart);
562 uart->filemode |= SERIAL_MODE_OUTPUT_OPEN;
563 uart->midi_output[substream->number] = substream;
564 spin_unlock_irqrestore(&uart->open_lock, flags);
565 return 0;
566 };
567
568 static int snd_uart16550_output_close(snd_rawmidi_substream_t * substream)
569 {
570 unsigned long flags;
571 snd_uart16550_t *uart = substream->rmidi->private_data;
572
573 spin_lock_irqsave(&uart->open_lock, flags);
574 uart->filemode &= ~SERIAL_MODE_OUTPUT_OPEN;
575 uart->midi_output[substream->number] = NULL;
576 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
577 snd_uart16550_do_close(uart);
578 spin_unlock_irqrestore(&uart->open_lock, flags);
579 return 0;
580 };
581
582 inline static int snd_uart16550_buffer_can_write( snd_uart16550_t *uart, int Num )
583 {
584 if( uart->buff_in_count + Num < TX_BUFF_SIZE )
585 return 1;
586 else
587 return 0;
588 }
589
590 inline static int snd_uart16550_write_buffer(snd_uart16550_t *uart, unsigned char byte)
591 {
592 unsigned short buff_in = uart->buff_in;
593 if( uart->buff_in_count < TX_BUFF_SIZE ) {
594 uart->tx_buff[buff_in] = byte;
595 buff_in++;
596 buff_in &= TX_BUFF_MASK;
597 uart->buff_in = buff_in;
598 uart->buff_in_count++;
599 if (uart->irq < 0) /* polling mode */
600 snd_uart16550_add_timer(uart);
601 return 1;
602 } else
603 return 0;
604 }
605
606 static int snd_uart16550_output_byte(snd_uart16550_t *uart, snd_rawmidi_substream_t * substream, unsigned char midi_byte)
607 {
608 if (uart->buff_in_count == 0 /* Buffer empty? */
609 && ((uart->adaptor != SNDRV_SERIAL_MS124W_SA &&
610 uart->adaptor != SNDRV_SERIAL_GENERIC) ||
611 (uart->fifo_count == 0 /* FIFO empty? */
612 && (inb(uart->base + UART_MSR) & UART_MSR_CTS)))) { /* CTS? */
613
614 /* Tx Buffer Empty - try to write immediately */
615 if ((inb(uart->base + UART_LSR) & UART_LSR_THRE) != 0) {
616 /* Transmitter holding register (and Tx FIFO) empty */
617 uart->fifo_count = 1;
618 outb(midi_byte, uart->base + UART_TX);
619 } else {
620 if (uart->fifo_count < uart->fifo_limit) {
621 uart->fifo_count++;
622 outb(midi_byte, uart->base + UART_TX);
623 } else {
624 /* Cannot write (buffer empty) - put char in buffer */
625 snd_uart16550_write_buffer(uart, midi_byte);
626 }
627 }
628 } else {
629 if( !snd_uart16550_write_buffer(uart, midi_byte) ) {
630 snd_printk("%s: Buffer overrun on device at 0x%lx\n",
631 uart->rmidi->name, uart->base);
632 return 0;
633 }
634 }
635
636 return 1;
637 }
638
639 static void snd_uart16550_output_write(snd_rawmidi_substream_t * substream)
640 {
641 unsigned long flags;
642 unsigned char midi_byte, addr_byte;
643 snd_uart16550_t *uart = substream->rmidi->private_data;
644 char first;
645 static unsigned long lasttime=0;
646
647 /* Interupts are disabled during the updating of the tx_buff,
648 * since it is 'bad' to have two processes updating the same
649 * variables (ie buff_in & buff_out)
650 */
651
652 spin_lock_irqsave(&uart->open_lock, flags);
653
654 if (uart->irq < 0) //polling
655 snd_uart16550_io_loop(uart);
656
657 if (uart->adaptor == SNDRV_SERIAL_MS124W_MB) {
658 while (1) {
659 /* buffer full? */
660 /* in this mode we need two bytes of space */
661 if (uart->buff_in_count > TX_BUFF_SIZE - 2)
662 break;
663 if (snd_rawmidi_transmit(substream, &midi_byte, 1) != 1)
664 break;
665 #ifdef SNDRV_SERIAL_MS124W_MB_NOCOMBO
666 /* select exactly one of the four ports */
667 addr_byte = (1 << (substream->number + 4)) | 0x08;
668 #else
669 /* select any combination of the four ports */
670 addr_byte = (substream->number << 4) | 0x08;
671 /* ...except none */
672 if (addr_byte == 0x08) addr_byte = 0xf8;
673 #endif
674 snd_uart16550_output_byte(uart, substream, addr_byte);
675 /* send midi byte */
676 snd_uart16550_output_byte(uart, substream, midi_byte);
677 }
678 } else {
679 first = 0;
680 while( 1 == snd_rawmidi_transmit_peek(substream, &midi_byte, 1) ) {
681 /* Also send F5 after 3 seconds with no data to handle device disconnect */
682 if (first == 0 && (uart->adaptor == SNDRV_SERIAL_SOUNDCANVAS ||
683 uart->adaptor == SNDRV_SERIAL_GENERIC) &&
684 (uart->prev_out != substream->number || 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 different previous
689 substream in this uart, send the change part event */
690 uart->prev_out = substream->number;
691 /* change part */
692 snd_uart16550_output_byte(uart, substream, 0xf5);
693 /* data */
694 snd_uart16550_output_byte(uart, substream, uart->prev_out + 1);
695 /* If midi_byte is a data byte, send the previous status byte */
696 if ((midi_byte < 0x80) && (uart->adaptor == SNDRV_SERIAL_SOUNDCANVAS))
697 snd_uart16550_output_byte(uart, substream, uart->prev_status[uart->prev_out]);
698 } else if( !uart->drop_on_full )
699 break;
700
701 }
702
703 /* send midi byte */
704 if( !snd_uart16550_output_byte(uart, substream, midi_byte) && !uart->drop_on_full )
705 break;
706
707 if (midi_byte >= 0x80 && midi_byte < 0xf0)
708 uart->prev_status[uart->prev_out] = midi_byte;
709 first = 1;
710
711 snd_rawmidi_transmit_ack( substream, 1 );
712 }
713 lasttime = jiffies;
714 }
715 spin_unlock_irqrestore(&uart->open_lock, flags);
716 }
717
718 static void snd_uart16550_output_trigger(snd_rawmidi_substream_t * substream, int up)
719 {
720 unsigned long flags;
721 snd_uart16550_t *uart = substream->rmidi->private_data;
722
723 spin_lock_irqsave(&uart->open_lock, flags);
724 if (up) {
725 uart->filemode |= SERIAL_MODE_OUTPUT_TRIGGERED;
726 } else {
727 uart->filemode &= ~SERIAL_MODE_OUTPUT_TRIGGERED;
728 }
729 spin_unlock_irqrestore(&uart->open_lock, flags);
730 if (up)
731 snd_uart16550_output_write(substream);
732 }
733
734 static snd_rawmidi_ops_t snd_uart16550_output =
735 {
736 .open = snd_uart16550_output_open,
737 .close = snd_uart16550_output_close,
738 .trigger = snd_uart16550_output_trigger,
739 };
740
741 static snd_rawmidi_ops_t snd_uart16550_input =
742 {
743 .open = snd_uart16550_input_open,
744 .close = snd_uart16550_input_close,
745 .trigger = snd_uart16550_input_trigger,
746 };
747
748 static int snd_uart16550_free(snd_uart16550_t *uart)
749 {
750 if (uart->irq >= 0)
751 free_irq(uart->irq, (void *)uart);
752 if (uart->res_base) {
753 release_resource(uart->res_base);
754 kfree_nocheck(uart->res_base);
755 }
756 kfree(uart);
757 return 0;
758 };
759
760 static int snd_uart16550_dev_free(snd_device_t *device)
761 {
762 snd_uart16550_t *uart = device->device_data;
763 return snd_uart16550_free(uart);
764 }
765
766 static int __init snd_uart16550_create(snd_card_t * card,
767 unsigned long iobase,
768 int irq,
769 unsigned int speed,
770 unsigned int base,
771 int adaptor,
772 int droponfull,
773 snd_uart16550_t **ruart)
774 {
775 static snd_device_ops_t ops = {
776 .dev_free = snd_uart16550_dev_free,
777 };
778 snd_uart16550_t *uart;
779 int err;
780
781
782 if ((uart = kcalloc(1, sizeof(*uart), GFP_KERNEL)) == NULL)
783 return -ENOMEM;
784 uart->adaptor = adaptor;
785 uart->card = card;
786 spin_lock_init(&uart->open_lock);
787 uart->irq = -1;
788 uart->base = iobase;
789 uart->drop_on_full = droponfull;
790
791 if ((err = snd_uart16550_detect(uart)) <= 0) {
792 printk(KERN_ERR "no UART detected at 0x%lx\n", iobase);
793 return err;
794 }
795
796 if (irq >= 0 && irq != SNDRV_AUTO_IRQ) {
797 if (request_irq(irq, snd_uart16550_interrupt,
798 SA_INTERRUPT, "Serial MIDI", (void *) uart)) {
799 snd_printk("irq %d busy. Using Polling.\n", irq);
800 } else {
801 uart->irq = irq;
802 }
803 }
804 uart->divisor = base / speed;
805 uart->speed = base / (unsigned int)uart->divisor;
806 uart->speed_base = base;
807 uart->prev_out = -1;
808 uart->prev_in = 0;
809 uart->rstatus = 0;
810 memset(uart->prev_status, 0x80, sizeof(unsigned char) * SNDRV_SERIAL_MAX_OUTS);
811 init_timer(&uart->buffer_timer);
812 uart->buffer_timer.function = snd_uart16550_buffer_timer;
813 uart->buffer_timer.data = (unsigned long)uart;
814 uart->timer_running = 0;
815
816 /* Register device */
817 if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, uart, &ops)) < 0) {
818 snd_uart16550_free(uart);
819 return err;
820 }
821
822 switch (uart->adaptor) {
823 case SNDRV_SERIAL_MS124W_SA:
824 case SNDRV_SERIAL_MS124W_MB:
825 /* MS-124W can draw power from RTS and DTR if they
826 are in opposite states. */
827 outb(UART_MCR_RTS | (0&UART_MCR_DTR), uart->base + UART_MCR);
828 break;
829 case SNDRV_SERIAL_MS124T:
830 /* MS-124T can draw power from RTS and/or DTR (preferably
831 both) if they are asserted. */
832 outb(UART_MCR_RTS | UART_MCR_DTR, uart->base + UART_MCR);
833 break;
834 default:
835 break;
836 }
837
838 if (ruart)
839 *ruart = uart;
840
841 return 0;
842 }
843
844 static void __init snd_uart16550_substreams(snd_rawmidi_str_t *stream)
845 {
846 struct list_head *list;
847
848 list_for_each(list, &stream->substreams) {
849 snd_rawmidi_substream_t *substream = list_entry(list, snd_rawmidi_substream_t, list);
850 sprintf(substream->name, "Serial MIDI %d", substream->number + 1);
851 }
852 }
853
854 static int __init snd_uart16550_rmidi(snd_uart16550_t *uart, int device, int outs, int ins, snd_rawmidi_t **rmidi)
855 {
856 snd_rawmidi_t *rrawmidi;
857 int err;
858
859 if ((err = snd_rawmidi_new(uart->card, "UART Serial MIDI", device, outs, ins, &rrawmidi)) < 0)
860 return err;
861 snd_rawmidi_set_ops(rrawmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_uart16550_input);
862 snd_rawmidi_set_ops(rrawmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_uart16550_output);
863 strcpy(rrawmidi->name, "Serial MIDI");
864 snd_uart16550_substreams(&rrawmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
865 snd_uart16550_substreams(&rrawmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
866 rrawmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
867 SNDRV_RAWMIDI_INFO_INPUT |
868 SNDRV_RAWMIDI_INFO_DUPLEX;
869 rrawmidi->private_data = uart;
870 if (rmidi)
871 *rmidi = rrawmidi;
872 return 0;
873 }
874
875 static int __init snd_serial_probe(int dev)
876 {
877 snd_card_t *card;
878 snd_uart16550_t *uart;
879 int err;
880
881 if (!enable[dev])
882 return -ENOENT;
883
884 switch (adaptor[dev]) {
885 case SNDRV_SERIAL_SOUNDCANVAS:
886 ins[dev] = 1;
887 break;
888 case SNDRV_SERIAL_MS124T:
889 case SNDRV_SERIAL_MS124W_SA:
890 outs[dev] = 1;
891 ins[dev] = 1;
892 break;
893 case SNDRV_SERIAL_MS124W_MB:
894 outs[dev] = 16;
895 ins[dev] = 1;
896 break;
897 case SNDRV_SERIAL_GENERIC:
898 break;
899 default:
900 snd_printk("Adaptor type is out of range 0-%d (%d)\n",
901 SNDRV_SERIAL_MAX_ADAPTOR, adaptor[dev]);
902 return -ENODEV;
903 }
904
905 if (outs[dev] < 1 || 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, outs[dev]);
908 return -ENODEV;
909 }
910
911 if (ins[dev] < 1 || ins[dev] > SNDRV_SERIAL_MAX_INS) {
912 snd_printk("Count of inputs is out of range 1-%d (%d)\n",
913 SNDRV_SERIAL_MAX_INS, ins[dev]);
914 return -ENODEV;
915 }
916
917 card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0);
918 if (card == NULL)
919 return -ENOMEM;
920
921 strcpy(card->driver, "Serial");
922 strcpy(card->shortname, "Serial MIDI (UART16550A)");
923
924 if ((err = snd_uart16550_create(card,
925 port[dev],
926 irq[dev],
927 speed[dev],
928 base[dev],
929 adaptor[dev],
930 droponfull[dev],
931 &uart)) < 0) {
932 snd_card_free(card);
933 return err;
934 }
935
936 if ((err = snd_uart16550_rmidi(uart, 0, outs[dev], ins[dev], &uart->rmidi)) < 0) {
937 snd_card_free(card);
938 return err;
939 }
940
941 sprintf(card->longname, "%s at 0x%lx, irq %d speed %d div %d outs %d ins %d adaptor %s droponfull %d",
942 card->shortname,
943 uart->base,
944 uart->irq,
945 uart->speed,
946 (int)uart->divisor,
947 outs[dev],
948 ins[dev],
949 adaptor_names[uart->adaptor],
950 uart->drop_on_full);
951
952 if ((err = snd_card_register(card)) < 0) {
953 snd_card_free(card);
954 return err;
955 }
956 snd_serial_cards[dev] = card;
957 return 0;
958 }
959
960 static int __init alsa_card_serial_init(void)
961 {
962 int dev = 0;
963 int cards = 0;
964
965 for (dev = 0; dev < SNDRV_CARDS; dev++) {
966 if (snd_serial_probe(dev) == 0)
967 cards++;
968 }
969
970 if (cards == 0) {
971 #ifdef MODULE
972 printk(KERN_ERR "serial midi soundcard not found or device busy\n");
973 #endif
974 return -ENODEV;
975 }
976 return 0;
977 }
978
979 static void __exit alsa_card_serial_exit(void)
980 {
981 int dev;
982
983 for (dev = 0; dev < SNDRV_CARDS; dev++) {
984 if (snd_serial_cards[dev] != NULL)
985 snd_card_free(snd_serial_cards[dev]);
986 }
987 }
988
989 module_init(alsa_card_serial_init)
990 module_exit(alsa_card_serial_exit)
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