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1 /*
2  * sound/oss/uart401.c
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>
27 #include <linux/slab.h>
28 #include <linux/spinlock.h>
29 #include "sound_config.h"
30
31 #include "mpu401.h"
32
33 typedef struct uart401_devc
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;
44 }
45 uart401_devc;
46
47 #define DATAPORT   (devc->base)
48 #define COMDPORT   (devc->base+1)
49 #define STATPORT   (devc->base+1)
50
51 static int uart401_status(uart401_devc * devc)
52 {
53         return inb(STATPORT);
54 }
55
56 #define input_avail(devc) (!(uart401_status(devc)&INPUT_AVAIL))
57 #define output_ready(devc)      (!(uart401_status(devc)&OUTPUT_READY))
58
59 static void uart401_cmd(uart401_devc * devc, unsigned char cmd)
60 {
61         outb((cmd), COMDPORT);
62 }
63
64 static int uart401_read(uart401_devc * devc)
65 {
66         return inb(DATAPORT);
67 }
68
69 static void uart401_write(uart401_devc * devc, unsigned char byte)
70 {
71         outb((byte), DATAPORT);
72 }
73
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
79
80 static int      reset_uart401(uart401_devc * devc);
81 static void     enter_uart_mode(uart401_devc * devc);
82
83 static void uart401_input_loop(uart401_devc * devc)
84 {
85         int work_limit=30000;
86         
87         while (input_avail(devc) && --work_limit)
88         {
89                 unsigned char   c = uart401_read(devc);
90
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);
95         }
96         if(work_limit==0)
97                 printk(KERN_WARNING "Too much work in interrupt on uart401 (0x%X). UART jabbering ??\n", devc->base);
98 }
99
100 irqreturn_t uart401intr(int irq, void *dev_id)
101 {
102         uart401_devc *devc = dev_id;
103
104         if (devc == NULL)
105         {
106                 printk(KERN_ERR "uart401: bad devc\n");
107                 return IRQ_NONE;
108         }
109
110         if (input_avail(devc))
111                 uart401_input_loop(devc);
112         return IRQ_HANDLED;
113 }
114
115 static int
116 uart401_open(int dev, int mode,
117              void            (*input) (int dev, unsigned char data),
118              void            (*output) (int dev)
119 )
120 {
121         uart401_devc *devc = (uart401_devc *) midi_devs[dev]->devc;
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 {
141         uart401_devc *devc = (uart401_devc *) midi_devs[dev]->devc;
142
143         reset_uart401(devc);
144         devc->opened = 0;
145 }
146
147 static int uart401_out(int dev, unsigned char midi_byte)
148 {
149         int timeout;
150         unsigned long flags;
151         uart401_devc *devc = (uart401_devc *) midi_devs[dev]->devc;
152
153         if (devc->disabled)
154                 return 1;
155         /*
156          * Test for input since pending input seems to block the output.
157          */
158
159         spin_lock_irqsave(&devc->lock,flags);   
160         if (input_avail(devc))
161                 uart401_input_loop(devc);
162
163         spin_unlock_irqrestore(&devc->lock,flags);
164
165         /*
166          * Sometimes it takes about 13000 loops before the output becomes ready
167          * (After reset). Normally it takes just about 10 loops.
168          */
169
170         for (timeout = 30000; timeout > 0 && !output_ready(devc); timeout--);
171
172         if (!output_ready(devc))
173         {
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;
179         }
180         uart401_write(devc, midi_byte);
181         return 1;
182 }
183
184 static inline int uart401_start_read(int dev)
185 {
186         return 0;
187 }
188
189 static inline int uart401_end_read(int dev)
190 {
191         return 0;
192 }
193
194 static inline void uart401_kick(int dev)
195 {
196 }
197
198 static inline int uart401_buffer_status(int dev)
199 {
200         return 0;
201 }
202
203 #define MIDI_SYNTH_NAME "MPU-401 UART"
204 #define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
205 #include "midi_synth.h"
206
207 static const struct midi_operations uart401_operations =
208 {
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,
220 };
221
222 static void enter_uart_mode(uart401_devc * devc)
223 {
224         int ok, timeout;
225         unsigned long flags;
226
227         spin_lock_irqsave(&devc->lock,flags);   
228         for (timeout = 30000; timeout > 0 && !output_ready(devc); timeout--);
229
230         devc->input_byte = 0;
231         uart401_cmd(devc, UART_MODE_ON);
232
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;
240
241         spin_unlock_irqrestore(&devc->lock,flags);
242 }
243
244 static int reset_uart401(uart401_devc * devc)
245 {
246         int ok, timeout, n;
247
248         /*
249          * Send the RESET command. Try again if no success at the first time.
250          */
251
252         ok = 0;
253
254         for (n = 0; n < 2 && !ok; n++)
255         {
256                 for (timeout = 30000; timeout > 0 && !output_ready(devc); timeout--);
257                 devc->input_byte = 0;
258                 uart401_cmd(devc, MPU_RESET);
259
260                 /*
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.
263                  */
264
265                 for (timeout = 50000; timeout > 0 && !ok; timeout--)
266                 {
267                         if (devc->input_byte == MPU_ACK)        /* Interrupt */
268                                 ok = 1;
269                         else if (input_avail(devc))
270                         {
271                                 if (uart401_read(devc) == MPU_ACK)
272                                         ok = 1;
273                         }
274                 }
275         }
276
277
278         if (ok)
279         {
280                 DEB(printk("Reset UART401 OK\n"));
281         }
282         else
283                 DDB(printk("Reset UART401 failed - No hardware detected.\n"));
284
285         if (ok)
286                 uart401_input_loop(devc);       /*
287                                                  * Flush input before enabling interrupts
288                                                  */
289
290         return ok;
291 }
292
293 int probe_uart401(struct address_info *hw_config, struct module *owner)
294 {
295         uart401_devc *devc;
296         char *name = "MPU-401 (UART) MIDI";
297         int ok = 0;
298         unsigned long flags;
299
300         DDB(printk("Entered probe_uart401()\n"));
301
302         /* Default to "not found" */
303         hw_config->slots[4] = -1;
304
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;
308         }
309
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;
314         }
315
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);
325
326         spin_lock_irqsave(&devc->lock,flags);   
327         ok = reset_uart401(devc);
328         spin_unlock_irqrestore(&devc->lock,flags);
329
330         if (!ok)
331                 goto cleanup_devc;
332
333         if (hw_config->name)
334                 name = hw_config->name;
335
336         if (devc->irq < 0) {
337                 devc->share_irq = 1;
338                 devc->irq *= -1;
339         } else
340                 devc->share_irq = 0;
341
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;
346                 }
347         devc->my_dev = sound_alloc_mididev();
348         enter_uart_mode(devc);
349
350         if (devc->my_dev == -1) {
351                 printk(KERN_INFO "uart401: Too many midi devices detected\n");
352                 goto cleanup_irq;
353         }
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;
359         }
360         memcpy(midi_devs[devc->my_dev], &uart401_operations, sizeof(struct midi_operations));
361
362         if (owner)
363                 midi_devs[devc->my_dev]->owner = owner;
364         
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;
370         }
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;
375
376         if (owner)
377                 midi_devs[devc->my_dev]->converter->owner = owner;
378
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;
395 }
396
397 void unload_uart401(struct address_info *hw_config)
398 {
399         uart401_devc *devc;
400         int n=hw_config->slots[4];
401         
402         /* Not set up */
403         if(n==-1 || midi_devs[n]==NULL)
404                 return;
405                 
406         /* Not allocated (erm ??) */
407         
408         devc = midi_devs[hw_config->slots[4]]->devc;
409         if (devc == NULL)
410                 return;
411
412         reset_uart401(devc);
413         release_region(hw_config->io_base, 4);
414
415         if (!devc->share_irq)
416                 free_irq(devc->irq, devc);
417         if (devc)
418         {
419                 kfree(midi_devs[devc->my_dev]->converter);
420                 kfree(midi_devs[devc->my_dev]);
421                 kfree(devc);
422                 devc = NULL;
423         }
424         /* This kills midi_devs[x] */
425         sound_unload_mididev(hw_config->slots[4]);
426 }
427
428 EXPORT_SYMBOL(probe_uart401);
429 EXPORT_SYMBOL(unload_uart401);
430 EXPORT_SYMBOL(uart401intr);
431
432 static struct address_info cfg_mpu;
433
434 static int io = -1;
435 static int irq = -1;
436
437 module_param(io, int, 0444);
438 module_param(irq, int, 0444);
439
440
441 static int __init init_uart401(void)
442 {
443         cfg_mpu.irq = irq;
444         cfg_mpu.io_base = io;
445
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;
452         }
453
454         return 0;
455 }
456
457 static void __exit cleanup_uart401(void)
458 {
459         if (cfg_mpu.io_base != -1 && cfg_mpu.irq != -1)
460                 unload_uart401(&cfg_mpu);
461 }
462
463 module_init(init_uart401);
464 module_exit(cleanup_uart401);
465
466 #ifndef MODULE
467 static int __init setup_uart401(char *str)
468 {
469         /* io, irq */
470         int ints[3];
471         
472         str = get_options(str, ARRAY_SIZE(ints), ints);
473
474         io = ints[1];
475         irq = ints[2];
476         
477         return 1;
478 }
479
480 __setup("uart401=", setup_uart401);
481 #endif
482 MODULE_LICENSE("GPL");