Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
f30c2269 | 2 | * sound/oss/uart401.c |
1da177e4 LT |
3 | * |
4 | * MPU-401 UART driver (formerly uart401_midi.c) | |
5 | * | |
6 | * | |
7 | * Copyright (C) by Hannu Savolainen 1993-1997 | |
8 | * | |
9 | * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL) | |
10 | * Version 2 (June 1991). See the "COPYING" file distributed with this software | |
11 | * for more info. | |
12 | * | |
13 | * Changes: | |
14 | * Alan Cox Reformatted, removed sound_mem usage, use normal Linux | |
15 | * interrupt allocation. Protect against bogus unload | |
16 | * Fixed to allow IRQ > 15 | |
17 | * Christoph Hellwig Adapted to module_init/module_exit | |
18 | * Arnaldo C. de Melo got rid of check_region | |
19 | * | |
20 | * Status: | |
21 | * Untested | |
22 | */ | |
23 | ||
24 | #include <linux/init.h> | |
25 | #include <linux/interrupt.h> | |
26 | #include <linux/module.h> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
1da177e4 LT |
28 | #include <linux/spinlock.h> |
29 | #include "sound_config.h" | |
30 | ||
31 | #include "mpu401.h" | |
32 | ||
80e7bbac | 33 | struct uart401_devc |
1da177e4 LT |
34 | { |
35 | int base; | |
36 | int irq; | |
37 | int *osp; | |
38 | void (*midi_input_intr) (int dev, unsigned char data); | |
39 | int opened, disabled; | |
40 | volatile unsigned char input_byte; | |
41 | int my_dev; | |
42 | int share_irq; | |
43 | spinlock_t lock; | |
80e7bbac | 44 | }; |
1da177e4 LT |
45 | |
46 | #define DATAPORT (devc->base) | |
47 | #define COMDPORT (devc->base+1) | |
48 | #define STATPORT (devc->base+1) | |
49 | ||
80e7bbac | 50 | static int uart401_status(struct uart401_devc *devc) |
1da177e4 LT |
51 | { |
52 | return inb(STATPORT); | |
53 | } | |
54 | ||
55 | #define input_avail(devc) (!(uart401_status(devc)&INPUT_AVAIL)) | |
56 | #define output_ready(devc) (!(uart401_status(devc)&OUTPUT_READY)) | |
57 | ||
80e7bbac | 58 | static void uart401_cmd(struct uart401_devc *devc, unsigned char cmd) |
1da177e4 LT |
59 | { |
60 | outb((cmd), COMDPORT); | |
61 | } | |
62 | ||
80e7bbac | 63 | static int uart401_read(struct uart401_devc *devc) |
1da177e4 LT |
64 | { |
65 | return inb(DATAPORT); | |
66 | } | |
67 | ||
80e7bbac | 68 | static void uart401_write(struct uart401_devc *devc, unsigned char byte) |
1da177e4 LT |
69 | { |
70 | outb((byte), DATAPORT); | |
71 | } | |
72 | ||
73 | #define OUTPUT_READY 0x40 | |
74 | #define INPUT_AVAIL 0x80 | |
75 | #define MPU_ACK 0xFE | |
76 | #define MPU_RESET 0xFF | |
77 | #define UART_MODE_ON 0x3F | |
78 | ||
80e7bbac HS |
79 | static int reset_uart401(struct uart401_devc *devc); |
80 | static void enter_uart_mode(struct uart401_devc *devc); | |
1da177e4 | 81 | |
80e7bbac | 82 | static void uart401_input_loop(struct uart401_devc *devc) |
1da177e4 LT |
83 | { |
84 | int work_limit=30000; | |
85 | ||
86 | while (input_avail(devc) && --work_limit) | |
87 | { | |
88 | unsigned char c = uart401_read(devc); | |
89 | ||
90 | if (c == MPU_ACK) | |
91 | devc->input_byte = c; | |
92 | else if (devc->opened & OPEN_READ && devc->midi_input_intr) | |
93 | devc->midi_input_intr(devc->my_dev, c); | |
94 | } | |
95 | if(work_limit==0) | |
96 | printk(KERN_WARNING "Too much work in interrupt on uart401 (0x%X). UART jabbering ??\n", devc->base); | |
97 | } | |
98 | ||
7d12e780 | 99 | irqreturn_t uart401intr(int irq, void *dev_id) |
1da177e4 | 100 | { |
80e7bbac | 101 | struct uart401_devc *devc = dev_id; |
1da177e4 LT |
102 | |
103 | if (devc == NULL) | |
104 | { | |
105 | printk(KERN_ERR "uart401: bad devc\n"); | |
106 | return IRQ_NONE; | |
107 | } | |
108 | ||
109 | if (input_avail(devc)) | |
110 | uart401_input_loop(devc); | |
111 | return IRQ_HANDLED; | |
112 | } | |
113 | ||
114 | static int | |
115 | uart401_open(int dev, int mode, | |
116 | void (*input) (int dev, unsigned char data), | |
117 | void (*output) (int dev) | |
118 | ) | |
119 | { | |
80e7bbac HS |
120 | struct uart401_devc *devc = (struct uart401_devc *) |
121 | midi_devs[dev]->devc; | |
1da177e4 LT |
122 | |
123 | if (devc->opened) | |
124 | return -EBUSY; | |
125 | ||
126 | /* Flush the UART */ | |
127 | ||
128 | while (input_avail(devc)) | |
129 | uart401_read(devc); | |
130 | ||
131 | devc->midi_input_intr = input; | |
132 | devc->opened = mode; | |
133 | enter_uart_mode(devc); | |
134 | devc->disabled = 0; | |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
139 | static void uart401_close(int dev) | |
140 | { | |
80e7bbac HS |
141 | struct uart401_devc *devc = (struct uart401_devc *) |
142 | midi_devs[dev]->devc; | |
1da177e4 LT |
143 | |
144 | reset_uart401(devc); | |
145 | devc->opened = 0; | |
146 | } | |
147 | ||
148 | static int uart401_out(int dev, unsigned char midi_byte) | |
149 | { | |
150 | int timeout; | |
151 | unsigned long flags; | |
80e7bbac HS |
152 | struct uart401_devc *devc = (struct uart401_devc *) |
153 | midi_devs[dev]->devc; | |
1da177e4 LT |
154 | |
155 | if (devc->disabled) | |
156 | return 1; | |
157 | /* | |
158 | * Test for input since pending input seems to block the output. | |
159 | */ | |
160 | ||
161 | spin_lock_irqsave(&devc->lock,flags); | |
162 | if (input_avail(devc)) | |
163 | uart401_input_loop(devc); | |
164 | ||
165 | spin_unlock_irqrestore(&devc->lock,flags); | |
166 | ||
167 | /* | |
168 | * Sometimes it takes about 13000 loops before the output becomes ready | |
169 | * (After reset). Normally it takes just about 10 loops. | |
170 | */ | |
171 | ||
172 | for (timeout = 30000; timeout > 0 && !output_ready(devc); timeout--); | |
173 | ||
174 | if (!output_ready(devc)) | |
175 | { | |
176 | printk(KERN_WARNING "uart401: Timeout - Device not responding\n"); | |
177 | devc->disabled = 1; | |
178 | reset_uart401(devc); | |
179 | enter_uart_mode(devc); | |
180 | return 1; | |
181 | } | |
182 | uart401_write(devc, midi_byte); | |
183 | return 1; | |
184 | } | |
185 | ||
186 | static inline int uart401_start_read(int dev) | |
187 | { | |
188 | return 0; | |
189 | } | |
190 | ||
191 | static inline int uart401_end_read(int dev) | |
192 | { | |
193 | return 0; | |
194 | } | |
195 | ||
196 | static inline void uart401_kick(int dev) | |
197 | { | |
198 | } | |
199 | ||
200 | static inline int uart401_buffer_status(int dev) | |
201 | { | |
202 | return 0; | |
203 | } | |
204 | ||
205 | #define MIDI_SYNTH_NAME "MPU-401 UART" | |
206 | #define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT | |
207 | #include "midi_synth.h" | |
208 | ||
209 | static const struct midi_operations uart401_operations = | |
210 | { | |
211 | .owner = THIS_MODULE, | |
212 | .info = {"MPU-401 (UART) MIDI", 0, 0, SNDCARD_MPU401}, | |
213 | .converter = &std_midi_synth, | |
214 | .in_info = {0}, | |
215 | .open = uart401_open, | |
216 | .close = uart401_close, | |
217 | .outputc = uart401_out, | |
218 | .start_read = uart401_start_read, | |
219 | .end_read = uart401_end_read, | |
220 | .kick = uart401_kick, | |
221 | .buffer_status = uart401_buffer_status, | |
222 | }; | |
223 | ||
80e7bbac | 224 | static void enter_uart_mode(struct uart401_devc *devc) |
1da177e4 LT |
225 | { |
226 | int ok, timeout; | |
227 | unsigned long flags; | |
228 | ||
229 | spin_lock_irqsave(&devc->lock,flags); | |
230 | for (timeout = 30000; timeout > 0 && !output_ready(devc); timeout--); | |
231 | ||
232 | devc->input_byte = 0; | |
233 | uart401_cmd(devc, UART_MODE_ON); | |
234 | ||
235 | ok = 0; | |
236 | for (timeout = 50000; timeout > 0 && !ok; timeout--) | |
237 | if (devc->input_byte == MPU_ACK) | |
238 | ok = 1; | |
239 | else if (input_avail(devc)) | |
240 | if (uart401_read(devc) == MPU_ACK) | |
241 | ok = 1; | |
242 | ||
243 | spin_unlock_irqrestore(&devc->lock,flags); | |
244 | } | |
245 | ||
80e7bbac | 246 | static int reset_uart401(struct uart401_devc *devc) |
1da177e4 LT |
247 | { |
248 | int ok, timeout, n; | |
249 | ||
250 | /* | |
251 | * Send the RESET command. Try again if no success at the first time. | |
252 | */ | |
253 | ||
254 | ok = 0; | |
255 | ||
256 | for (n = 0; n < 2 && !ok; n++) | |
257 | { | |
258 | for (timeout = 30000; timeout > 0 && !output_ready(devc); timeout--); | |
259 | devc->input_byte = 0; | |
260 | uart401_cmd(devc, MPU_RESET); | |
261 | ||
262 | /* | |
263 | * Wait at least 25 msec. This method is not accurate so let's make the | |
264 | * loop bit longer. Cannot sleep since this is called during boot. | |
265 | */ | |
266 | ||
267 | for (timeout = 50000; timeout > 0 && !ok; timeout--) | |
268 | { | |
269 | if (devc->input_byte == MPU_ACK) /* Interrupt */ | |
270 | ok = 1; | |
271 | else if (input_avail(devc)) | |
272 | { | |
273 | if (uart401_read(devc) == MPU_ACK) | |
274 | ok = 1; | |
275 | } | |
276 | } | |
277 | } | |
278 | ||
3af5d052 | 279 | /* Flush input before enabling interrupts */ |
1da177e4 | 280 | if (ok) |
3af5d052 | 281 | uart401_input_loop(devc); |
1da177e4 LT |
282 | else |
283 | DDB(printk("Reset UART401 failed - No hardware detected.\n")); | |
284 | ||
1da177e4 LT |
285 | return ok; |
286 | } | |
287 | ||
288 | int probe_uart401(struct address_info *hw_config, struct module *owner) | |
289 | { | |
80e7bbac | 290 | struct uart401_devc *devc; |
1da177e4 LT |
291 | char *name = "MPU-401 (UART) MIDI"; |
292 | int ok = 0; | |
293 | unsigned long flags; | |
294 | ||
295 | DDB(printk("Entered probe_uart401()\n")); | |
296 | ||
297 | /* Default to "not found" */ | |
298 | hw_config->slots[4] = -1; | |
299 | ||
300 | if (!request_region(hw_config->io_base, 4, "MPU-401 UART")) { | |
301 | printk(KERN_INFO "uart401: could not request_region(%d, 4)\n", hw_config->io_base); | |
302 | return 0; | |
303 | } | |
304 | ||
80e7bbac | 305 | devc = kmalloc(sizeof(struct uart401_devc), GFP_KERNEL); |
1da177e4 LT |
306 | if (!devc) { |
307 | printk(KERN_WARNING "uart401: Can't allocate memory\n"); | |
308 | goto cleanup_region; | |
309 | } | |
310 | ||
311 | devc->base = hw_config->io_base; | |
312 | devc->irq = hw_config->irq; | |
313 | devc->osp = hw_config->osp; | |
314 | devc->midi_input_intr = NULL; | |
315 | devc->opened = 0; | |
316 | devc->input_byte = 0; | |
317 | devc->my_dev = 0; | |
318 | devc->share_irq = 0; | |
319 | spin_lock_init(&devc->lock); | |
320 | ||
321 | spin_lock_irqsave(&devc->lock,flags); | |
322 | ok = reset_uart401(devc); | |
323 | spin_unlock_irqrestore(&devc->lock,flags); | |
324 | ||
325 | if (!ok) | |
326 | goto cleanup_devc; | |
327 | ||
328 | if (hw_config->name) | |
329 | name = hw_config->name; | |
330 | ||
331 | if (devc->irq < 0) { | |
332 | devc->share_irq = 1; | |
333 | devc->irq *= -1; | |
334 | } else | |
335 | devc->share_irq = 0; | |
336 | ||
337 | if (!devc->share_irq) | |
338 | if (request_irq(devc->irq, uart401intr, 0, "MPU-401 UART", devc) < 0) { | |
339 | printk(KERN_WARNING "uart401: Failed to allocate IRQ%d\n", devc->irq); | |
340 | devc->share_irq = 1; | |
341 | } | |
342 | devc->my_dev = sound_alloc_mididev(); | |
343 | enter_uart_mode(devc); | |
344 | ||
345 | if (devc->my_dev == -1) { | |
346 | printk(KERN_INFO "uart401: Too many midi devices detected\n"); | |
347 | goto cleanup_irq; | |
348 | } | |
349 | conf_printf(name, hw_config); | |
0d9ffc97 AG |
350 | midi_devs[devc->my_dev] = kmemdup(&uart401_operations, |
351 | sizeof(struct midi_operations), | |
352 | GFP_KERNEL); | |
1da177e4 LT |
353 | if (!midi_devs[devc->my_dev]) { |
354 | printk(KERN_ERR "uart401: Failed to allocate memory\n"); | |
355 | goto cleanup_unload_mididev; | |
356 | } | |
1da177e4 LT |
357 | |
358 | if (owner) | |
359 | midi_devs[devc->my_dev]->owner = owner; | |
360 | ||
361 | midi_devs[devc->my_dev]->devc = devc; | |
0d9ffc97 AG |
362 | midi_devs[devc->my_dev]->converter = kmemdup(&std_midi_synth, |
363 | sizeof(struct synth_operations), | |
364 | GFP_KERNEL); | |
365 | ||
1da177e4 LT |
366 | if (!midi_devs[devc->my_dev]->converter) { |
367 | printk(KERN_WARNING "uart401: Failed to allocate memory\n"); | |
368 | goto cleanup_midi_devs; | |
369 | } | |
1da177e4 LT |
370 | strcpy(midi_devs[devc->my_dev]->info.name, name); |
371 | midi_devs[devc->my_dev]->converter->id = "UART401"; | |
372 | midi_devs[devc->my_dev]->converter->midi_dev = devc->my_dev; | |
373 | ||
374 | if (owner) | |
375 | midi_devs[devc->my_dev]->converter->owner = owner; | |
376 | ||
377 | hw_config->slots[4] = devc->my_dev; | |
378 | sequencer_init(); | |
379 | devc->opened = 0; | |
380 | return 1; | |
381 | cleanup_midi_devs: | |
382 | kfree(midi_devs[devc->my_dev]); | |
383 | cleanup_unload_mididev: | |
384 | sound_unload_mididev(devc->my_dev); | |
385 | cleanup_irq: | |
386 | if (!devc->share_irq) | |
387 | free_irq(devc->irq, devc); | |
388 | cleanup_devc: | |
389 | kfree(devc); | |
390 | cleanup_region: | |
391 | release_region(hw_config->io_base, 4); | |
392 | return 0; | |
393 | } | |
394 | ||
395 | void unload_uart401(struct address_info *hw_config) | |
396 | { | |
80e7bbac | 397 | struct uart401_devc *devc; |
1da177e4 LT |
398 | int n=hw_config->slots[4]; |
399 | ||
400 | /* Not set up */ | |
401 | if(n==-1 || midi_devs[n]==NULL) | |
402 | return; | |
403 | ||
404 | /* Not allocated (erm ??) */ | |
405 | ||
406 | devc = midi_devs[hw_config->slots[4]]->devc; | |
407 | if (devc == NULL) | |
408 | return; | |
409 | ||
410 | reset_uart401(devc); | |
411 | release_region(hw_config->io_base, 4); | |
412 | ||
413 | if (!devc->share_irq) | |
414 | free_irq(devc->irq, devc); | |
4fc390a1 DC |
415 | kfree(midi_devs[devc->my_dev]->converter); |
416 | kfree(midi_devs[devc->my_dev]); | |
417 | kfree(devc); | |
418 | ||
1da177e4 LT |
419 | /* This kills midi_devs[x] */ |
420 | sound_unload_mididev(hw_config->slots[4]); | |
421 | } | |
422 | ||
423 | EXPORT_SYMBOL(probe_uart401); | |
424 | EXPORT_SYMBOL(unload_uart401); | |
425 | EXPORT_SYMBOL(uart401intr); | |
426 | ||
427 | static struct address_info cfg_mpu; | |
428 | ||
429 | static int io = -1; | |
430 | static int irq = -1; | |
431 | ||
432 | module_param(io, int, 0444); | |
433 | module_param(irq, int, 0444); | |
434 | ||
435 | ||
436 | static int __init init_uart401(void) | |
437 | { | |
438 | cfg_mpu.irq = irq; | |
439 | cfg_mpu.io_base = io; | |
440 | ||
441 | /* Can be loaded either for module use or to provide functions | |
442 | to others */ | |
443 | if (cfg_mpu.io_base != -1 && cfg_mpu.irq != -1) { | |
444 | printk(KERN_INFO "MPU-401 UART driver Copyright (C) Hannu Savolainen 1993-1997"); | |
445 | if (!probe_uart401(&cfg_mpu, THIS_MODULE)) | |
446 | return -ENODEV; | |
447 | } | |
448 | ||
449 | return 0; | |
450 | } | |
451 | ||
452 | static void __exit cleanup_uart401(void) | |
453 | { | |
454 | if (cfg_mpu.io_base != -1 && cfg_mpu.irq != -1) | |
455 | unload_uart401(&cfg_mpu); | |
456 | } | |
457 | ||
458 | module_init(init_uart401); | |
459 | module_exit(cleanup_uart401); | |
460 | ||
461 | #ifndef MODULE | |
462 | static int __init setup_uart401(char *str) | |
463 | { | |
464 | /* io, irq */ | |
465 | int ints[3]; | |
466 | ||
467 | str = get_options(str, ARRAY_SIZE(ints), ints); | |
468 | ||
469 | io = ints[1]; | |
470 | irq = ints[2]; | |
471 | ||
472 | return 1; | |
473 | } | |
474 | ||
475 | __setup("uart401=", setup_uart401); | |
476 | #endif | |
477 | MODULE_LICENSE("GPL"); |