Revert "microblaze_mmu_v2: Update signal returning address"
[linux/fpc-iii.git] / sound / oss / uart401.c
blob8e514a676a0d00df1dcff0ce71a57119b456b254
1 /*
2 * sound/oss/uart401.c
4 * MPU-401 UART driver (formerly uart401_midi.c)
7 * Copyright (C) by Hannu Savolainen 1993-1997
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.
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
20 * Status:
21 * Untested
24 #include <linux/init.h>
25 #include <linux/interrupt.h>
26 #include <linux/module.h>
27 #include <linux/slab.h>
28 #include <linux/spinlock.h>
29 #include "sound_config.h"
31 #include "mpu401.h"
33 typedef struct uart401_devc
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;
45 uart401_devc;
47 #define DATAPORT (devc->base)
48 #define COMDPORT (devc->base+1)
49 #define STATPORT (devc->base+1)
51 static int uart401_status(uart401_devc * devc)
53 return inb(STATPORT);
56 #define input_avail(devc) (!(uart401_status(devc)&INPUT_AVAIL))
57 #define output_ready(devc) (!(uart401_status(devc)&OUTPUT_READY))
59 static void uart401_cmd(uart401_devc * devc, unsigned char cmd)
61 outb((cmd), COMDPORT);
64 static int uart401_read(uart401_devc * devc)
66 return inb(DATAPORT);
69 static void uart401_write(uart401_devc * devc, unsigned char byte)
71 outb((byte), DATAPORT);
74 #define OUTPUT_READY 0x40
75 #define INPUT_AVAIL 0x80
76 #define MPU_ACK 0xFE
77 #define MPU_RESET 0xFF
78 #define UART_MODE_ON 0x3F
80 static int reset_uart401(uart401_devc * devc);
81 static void enter_uart_mode(uart401_devc * devc);
83 static void uart401_input_loop(uart401_devc * devc)
85 int work_limit=30000;
87 while (input_avail(devc) && --work_limit)
89 unsigned char c = uart401_read(devc);
91 if (c == MPU_ACK)
92 devc->input_byte = c;
93 else if (devc->opened & OPEN_READ && devc->midi_input_intr)
94 devc->midi_input_intr(devc->my_dev, c);
96 if(work_limit==0)
97 printk(KERN_WARNING "Too much work in interrupt on uart401 (0x%X). UART jabbering ??\n", devc->base);
100 irqreturn_t uart401intr(int irq, void *dev_id)
102 uart401_devc *devc = dev_id;
104 if (devc == NULL)
106 printk(KERN_ERR "uart401: bad devc\n");
107 return IRQ_NONE;
110 if (input_avail(devc))
111 uart401_input_loop(devc);
112 return IRQ_HANDLED;
115 static int
116 uart401_open(int dev, int mode,
117 void (*input) (int dev, unsigned char data),
118 void (*output) (int dev)
121 uart401_devc *devc = (uart401_devc *) midi_devs[dev]->devc;
123 if (devc->opened)
124 return -EBUSY;
126 /* Flush the UART */
128 while (input_avail(devc))
129 uart401_read(devc);
131 devc->midi_input_intr = input;
132 devc->opened = mode;
133 enter_uart_mode(devc);
134 devc->disabled = 0;
136 return 0;
139 static void uart401_close(int dev)
141 uart401_devc *devc = (uart401_devc *) midi_devs[dev]->devc;
143 reset_uart401(devc);
144 devc->opened = 0;
147 static int uart401_out(int dev, unsigned char midi_byte)
149 int timeout;
150 unsigned long flags;
151 uart401_devc *devc = (uart401_devc *) midi_devs[dev]->devc;
153 if (devc->disabled)
154 return 1;
156 * Test for input since pending input seems to block the output.
159 spin_lock_irqsave(&devc->lock,flags);
160 if (input_avail(devc))
161 uart401_input_loop(devc);
163 spin_unlock_irqrestore(&devc->lock,flags);
166 * Sometimes it takes about 13000 loops before the output becomes ready
167 * (After reset). Normally it takes just about 10 loops.
170 for (timeout = 30000; timeout > 0 && !output_ready(devc); timeout--);
172 if (!output_ready(devc))
174 printk(KERN_WARNING "uart401: Timeout - Device not responding\n");
175 devc->disabled = 1;
176 reset_uart401(devc);
177 enter_uart_mode(devc);
178 return 1;
180 uart401_write(devc, midi_byte);
181 return 1;
184 static inline int uart401_start_read(int dev)
186 return 0;
189 static inline int uart401_end_read(int dev)
191 return 0;
194 static inline void uart401_kick(int dev)
198 static inline int uart401_buffer_status(int dev)
200 return 0;
203 #define MIDI_SYNTH_NAME "MPU-401 UART"
204 #define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
205 #include "midi_synth.h"
207 static const struct midi_operations uart401_operations =
209 .owner = THIS_MODULE,
210 .info = {"MPU-401 (UART) MIDI", 0, 0, SNDCARD_MPU401},
211 .converter = &std_midi_synth,
212 .in_info = {0},
213 .open = uart401_open,
214 .close = uart401_close,
215 .outputc = uart401_out,
216 .start_read = uart401_start_read,
217 .end_read = uart401_end_read,
218 .kick = uart401_kick,
219 .buffer_status = uart401_buffer_status,
222 static void enter_uart_mode(uart401_devc * devc)
224 int ok, timeout;
225 unsigned long flags;
227 spin_lock_irqsave(&devc->lock,flags);
228 for (timeout = 30000; timeout > 0 && !output_ready(devc); timeout--);
230 devc->input_byte = 0;
231 uart401_cmd(devc, UART_MODE_ON);
233 ok = 0;
234 for (timeout = 50000; timeout > 0 && !ok; timeout--)
235 if (devc->input_byte == MPU_ACK)
236 ok = 1;
237 else if (input_avail(devc))
238 if (uart401_read(devc) == MPU_ACK)
239 ok = 1;
241 spin_unlock_irqrestore(&devc->lock,flags);
244 static int reset_uart401(uart401_devc * devc)
246 int ok, timeout, n;
249 * Send the RESET command. Try again if no success at the first time.
252 ok = 0;
254 for (n = 0; n < 2 && !ok; n++)
256 for (timeout = 30000; timeout > 0 && !output_ready(devc); timeout--);
257 devc->input_byte = 0;
258 uart401_cmd(devc, MPU_RESET);
261 * Wait at least 25 msec. This method is not accurate so let's make the
262 * loop bit longer. Cannot sleep since this is called during boot.
265 for (timeout = 50000; timeout > 0 && !ok; timeout--)
267 if (devc->input_byte == MPU_ACK) /* Interrupt */
268 ok = 1;
269 else if (input_avail(devc))
271 if (uart401_read(devc) == MPU_ACK)
272 ok = 1;
278 if (ok)
280 DEB(printk("Reset UART401 OK\n"));
282 else
283 DDB(printk("Reset UART401 failed - No hardware detected.\n"));
285 if (ok)
286 uart401_input_loop(devc); /*
287 * Flush input before enabling interrupts
290 return ok;
293 int probe_uart401(struct address_info *hw_config, struct module *owner)
295 uart401_devc *devc;
296 char *name = "MPU-401 (UART) MIDI";
297 int ok = 0;
298 unsigned long flags;
300 DDB(printk("Entered probe_uart401()\n"));
302 /* Default to "not found" */
303 hw_config->slots[4] = -1;
305 if (!request_region(hw_config->io_base, 4, "MPU-401 UART")) {
306 printk(KERN_INFO "uart401: could not request_region(%d, 4)\n", hw_config->io_base);
307 return 0;
310 devc = kmalloc(sizeof(uart401_devc), GFP_KERNEL);
311 if (!devc) {
312 printk(KERN_WARNING "uart401: Can't allocate memory\n");
313 goto cleanup_region;
316 devc->base = hw_config->io_base;
317 devc->irq = hw_config->irq;
318 devc->osp = hw_config->osp;
319 devc->midi_input_intr = NULL;
320 devc->opened = 0;
321 devc->input_byte = 0;
322 devc->my_dev = 0;
323 devc->share_irq = 0;
324 spin_lock_init(&devc->lock);
326 spin_lock_irqsave(&devc->lock,flags);
327 ok = reset_uart401(devc);
328 spin_unlock_irqrestore(&devc->lock,flags);
330 if (!ok)
331 goto cleanup_devc;
333 if (hw_config->name)
334 name = hw_config->name;
336 if (devc->irq < 0) {
337 devc->share_irq = 1;
338 devc->irq *= -1;
339 } else
340 devc->share_irq = 0;
342 if (!devc->share_irq)
343 if (request_irq(devc->irq, uart401intr, 0, "MPU-401 UART", devc) < 0) {
344 printk(KERN_WARNING "uart401: Failed to allocate IRQ%d\n", devc->irq);
345 devc->share_irq = 1;
347 devc->my_dev = sound_alloc_mididev();
348 enter_uart_mode(devc);
350 if (devc->my_dev == -1) {
351 printk(KERN_INFO "uart401: Too many midi devices detected\n");
352 goto cleanup_irq;
354 conf_printf(name, hw_config);
355 midi_devs[devc->my_dev] = kmalloc(sizeof(struct midi_operations), GFP_KERNEL);
356 if (!midi_devs[devc->my_dev]) {
357 printk(KERN_ERR "uart401: Failed to allocate memory\n");
358 goto cleanup_unload_mididev;
360 memcpy(midi_devs[devc->my_dev], &uart401_operations, sizeof(struct midi_operations));
362 if (owner)
363 midi_devs[devc->my_dev]->owner = owner;
365 midi_devs[devc->my_dev]->devc = devc;
366 midi_devs[devc->my_dev]->converter = kmalloc(sizeof(struct synth_operations), GFP_KERNEL);
367 if (!midi_devs[devc->my_dev]->converter) {
368 printk(KERN_WARNING "uart401: Failed to allocate memory\n");
369 goto cleanup_midi_devs;
371 memcpy(midi_devs[devc->my_dev]->converter, &std_midi_synth, sizeof(struct synth_operations));
372 strcpy(midi_devs[devc->my_dev]->info.name, name);
373 midi_devs[devc->my_dev]->converter->id = "UART401";
374 midi_devs[devc->my_dev]->converter->midi_dev = devc->my_dev;
376 if (owner)
377 midi_devs[devc->my_dev]->converter->owner = owner;
379 hw_config->slots[4] = devc->my_dev;
380 sequencer_init();
381 devc->opened = 0;
382 return 1;
383 cleanup_midi_devs:
384 kfree(midi_devs[devc->my_dev]);
385 cleanup_unload_mididev:
386 sound_unload_mididev(devc->my_dev);
387 cleanup_irq:
388 if (!devc->share_irq)
389 free_irq(devc->irq, devc);
390 cleanup_devc:
391 kfree(devc);
392 cleanup_region:
393 release_region(hw_config->io_base, 4);
394 return 0;
397 void unload_uart401(struct address_info *hw_config)
399 uart401_devc *devc;
400 int n=hw_config->slots[4];
402 /* Not set up */
403 if(n==-1 || midi_devs[n]==NULL)
404 return;
406 /* Not allocated (erm ??) */
408 devc = midi_devs[hw_config->slots[4]]->devc;
409 if (devc == NULL)
410 return;
412 reset_uart401(devc);
413 release_region(hw_config->io_base, 4);
415 if (!devc->share_irq)
416 free_irq(devc->irq, devc);
417 if (devc)
419 kfree(midi_devs[devc->my_dev]->converter);
420 kfree(midi_devs[devc->my_dev]);
421 kfree(devc);
422 devc = NULL;
424 /* This kills midi_devs[x] */
425 sound_unload_mididev(hw_config->slots[4]);
428 EXPORT_SYMBOL(probe_uart401);
429 EXPORT_SYMBOL(unload_uart401);
430 EXPORT_SYMBOL(uart401intr);
432 static struct address_info cfg_mpu;
434 static int io = -1;
435 static int irq = -1;
437 module_param(io, int, 0444);
438 module_param(irq, int, 0444);
441 static int __init init_uart401(void)
443 cfg_mpu.irq = irq;
444 cfg_mpu.io_base = io;
446 /* Can be loaded either for module use or to provide functions
447 to others */
448 if (cfg_mpu.io_base != -1 && cfg_mpu.irq != -1) {
449 printk(KERN_INFO "MPU-401 UART driver Copyright (C) Hannu Savolainen 1993-1997");
450 if (!probe_uart401(&cfg_mpu, THIS_MODULE))
451 return -ENODEV;
454 return 0;
457 static void __exit cleanup_uart401(void)
459 if (cfg_mpu.io_base != -1 && cfg_mpu.irq != -1)
460 unload_uart401(&cfg_mpu);
463 module_init(init_uart401);
464 module_exit(cleanup_uart401);
466 #ifndef MODULE
467 static int __init setup_uart401(char *str)
469 /* io, irq */
470 int ints[3];
472 str = get_options(str, ARRAY_SIZE(ints), ints);
474 io = ints[1];
475 irq = ints[2];
477 return 1;
480 __setup("uart401=", setup_uart401);
481 #endif
482 MODULE_LICENSE("GPL");