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Linux/sound/oss/uart6850.c

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  1 /*
  2  * sound/oss/uart6850.c
  3  *
  4  *
  5  * Copyright (C) by Hannu Savolainen 1993-1997
  6  *
  7  * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
  8  * Version 2 (June 1991). See the "COPYING" file distributed with this software
  9  * for more info.
 10  * Extended by Alan Cox for Red Hat Software. Now a loadable MIDI driver.
 11  * 28/4/97 - (C) Copyright Alan Cox. Released under the GPL version 2.
 12  *
 13  * Alan Cox:            Updated for new modular code. Removed snd_* irq handling. Now
 14  *                      uses native linux resources
 15  * Christoph Hellwig:   Adapted to module_init/module_exit
 16  * Jeff Garzik:         Made it work again, in theory
 17  *                      FIXME: If the request_irq() succeeds, the probe succeeds. Ug.
 18  *
 19  *      Status: Testing required (no shit -jgarzik)
 20  *
 21  *
 22  */
 23 
 24 #include <linux/init.h>
 25 #include <linux/interrupt.h>
 26 #include <linux/module.h>
 27 #include <linux/spinlock.h>
 28 /* Mon Nov 22 22:38:35 MET 1993 marco@driq.home.usn.nl:
 29  *      added 6850 support, used with COVOX SoundMaster II and custom cards.
 30  */
 31 
 32 #include "sound_config.h"
 33 
 34 static int uart6850_base = 0x330;
 35 
 36 static int *uart6850_osp;
 37 
 38 #define DATAPORT   (uart6850_base)
 39 #define COMDPORT   (uart6850_base+1)
 40 #define STATPORT   (uart6850_base+1)
 41 
 42 static int uart6850_status(void)
 43 {
 44         return inb(STATPORT);
 45 }
 46 
 47 #define input_avail()           (uart6850_status()&INPUT_AVAIL)
 48 #define output_ready()          (uart6850_status()&OUTPUT_READY)
 49 
 50 static void uart6850_cmd(unsigned char cmd)
 51 {
 52         outb(cmd, COMDPORT);
 53 }
 54 
 55 static int uart6850_read(void)
 56 {
 57         return inb(DATAPORT);
 58 }
 59 
 60 static void uart6850_write(unsigned char byte)
 61 {
 62         outb(byte, DATAPORT);
 63 }
 64 
 65 #define OUTPUT_READY    0x02    /* Mask for data ready Bit */
 66 #define INPUT_AVAIL     0x01    /* Mask for Data Send Ready Bit */
 67 
 68 #define UART_RESET      0x95
 69 #define UART_MODE_ON    0x03
 70 
 71 static int uart6850_opened;
 72 static int uart6850_irq;
 73 static int uart6850_detected;
 74 static int my_dev;
 75 static DEFINE_SPINLOCK(lock);
 76 
 77 static void (*midi_input_intr) (int dev, unsigned char data);
 78 static void poll_uart6850(unsigned long dummy);
 79 
 80 
 81 static DEFINE_TIMER(uart6850_timer, poll_uart6850, 0, 0);
 82 
 83 static void uart6850_input_loop(void)
 84 {
 85         int count = 10;
 86 
 87         while (count)
 88         {
 89                 /*
 90                  * Not timed out
 91                  */
 92                 if (input_avail())
 93                 {
 94                         unsigned char c = uart6850_read();
 95                         count = 100;
 96                         if (uart6850_opened & OPEN_READ)
 97                                 midi_input_intr(my_dev, c);
 98                 }
 99                 else
100                 {
101                         while (!input_avail() && count)
102                                 count--;
103                 }
104         }
105 }
106 
107 static irqreturn_t m6850intr(int irq, void *dev_id)
108 {
109         if (input_avail())
110                 uart6850_input_loop();
111         return IRQ_HANDLED;
112 }
113 
114 /*
115  *      It looks like there is no input interrupts in the UART mode. Let's try
116  *      polling.
117  */
118 
119 static void poll_uart6850(unsigned long dummy)
120 {
121         unsigned long flags;
122 
123         if (!(uart6850_opened & OPEN_READ))
124                 return;         /* Device has been closed */
125 
126         spin_lock_irqsave(&lock,flags);
127         if (input_avail())
128                 uart6850_input_loop();
129 
130         uart6850_timer.expires = 1 + jiffies;
131         add_timer(&uart6850_timer);
132         
133         /*
134          *      Come back later
135          */
136 
137         spin_unlock_irqrestore(&lock,flags);
138 }
139 
140 static int uart6850_open(int dev, int mode,
141               void            (*input) (int dev, unsigned char data),
142               void            (*output) (int dev)
143 )
144 {
145         if (uart6850_opened)
146         {
147 /*                printk("Midi6850: Midi busy\n");*/
148                   return -EBUSY;
149         };
150 
151         uart6850_cmd(UART_RESET);
152         uart6850_input_loop();
153         midi_input_intr = input;
154         uart6850_opened = mode;
155         poll_uart6850(0);       /*
156                                  * Enable input polling
157                                  */
158 
159         return 0;
160 }
161 
162 static void uart6850_close(int dev)
163 {
164         uart6850_cmd(UART_MODE_ON);
165         del_timer(&uart6850_timer);
166         uart6850_opened = 0;
167 }
168 
169 static int uart6850_out(int dev, unsigned char midi_byte)
170 {
171         int timeout;
172         unsigned long flags;
173 
174         /*
175          * Test for input since pending input seems to block the output.
176          */
177 
178         spin_lock_irqsave(&lock,flags);
179 
180         if (input_avail())
181                 uart6850_input_loop();
182 
183         spin_unlock_irqrestore(&lock,flags);
184 
185         /*
186          * Sometimes it takes about 13000 loops before the output becomes ready
187          * (After reset). Normally it takes just about 10 loops.
188          */
189 
190         for (timeout = 30000; timeout > 0 && !output_ready(); timeout--);       /*
191                                                                                  * Wait
192                                                                                  */
193         if (!output_ready())
194         {
195                 printk(KERN_WARNING "Midi6850: Timeout\n");
196                 return 0;
197         }
198         uart6850_write(midi_byte);
199         return 1;
200 }
201 
202 static inline int uart6850_command(int dev, unsigned char *midi_byte)
203 {
204         return 1;
205 }
206 
207 static inline int uart6850_start_read(int dev)
208 {
209         return 0;
210 }
211 
212 static inline int uart6850_end_read(int dev)
213 {
214         return 0;
215 }
216 
217 static inline void uart6850_kick(int dev)
218 {
219 }
220 
221 static inline int uart6850_buffer_status(int dev)
222 {
223         return 0;               /*
224                                  * No data in buffers
225                                  */
226 }
227 
228 #define MIDI_SYNTH_NAME "6850 UART Midi"
229 #define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
230 #include "midi_synth.h"
231 
232 static struct midi_operations uart6850_operations =
233 {
234         .owner          = THIS_MODULE,
235         .info           = {"6850 UART", 0, 0, SNDCARD_UART6850},
236         .converter      = &std_midi_synth,
237         .in_info        = {0},
238         .open           = uart6850_open,
239         .close          = uart6850_close,
240         .outputc        = uart6850_out,
241         .start_read     = uart6850_start_read,
242         .end_read       = uart6850_end_read,
243         .kick           = uart6850_kick,
244         .command        = uart6850_command,
245         .buffer_status  = uart6850_buffer_status
246 };
247 
248 
249 static void __init attach_uart6850(struct address_info *hw_config)
250 {
251         int ok, timeout;
252         unsigned long   flags;
253 
254         if (!uart6850_detected)
255                 return;
256 
257         if ((my_dev = sound_alloc_mididev()) == -1)
258         {
259                 printk(KERN_INFO "uart6850: Too many midi devices detected\n");
260                 return;
261         }
262         uart6850_base = hw_config->io_base;
263         uart6850_osp = hw_config->osp;
264         uart6850_irq = hw_config->irq;
265 
266         spin_lock_irqsave(&lock,flags);
267 
268         for (timeout = 30000; timeout > 0 && !output_ready(); timeout--);       /*
269                                                                                  * Wait
270                                                                                  */
271         uart6850_cmd(UART_MODE_ON);
272         ok = 1;
273         spin_unlock_irqrestore(&lock,flags);
274 
275         conf_printf("6850 Midi Interface", hw_config);
276 
277         std_midi_synth.midi_dev = my_dev;
278         hw_config->slots[4] = my_dev;
279         midi_devs[my_dev] = &uart6850_operations;
280         sequencer_init();
281 }
282 
283 static inline int reset_uart6850(void)
284 {
285         uart6850_read();
286         return 1;               /*
287                                  * OK
288                                  */
289 }
290 
291 static int __init probe_uart6850(struct address_info *hw_config)
292 {
293         int ok;
294 
295         uart6850_osp = hw_config->osp;
296         uart6850_base = hw_config->io_base;
297         uart6850_irq = hw_config->irq;
298 
299         if (request_irq(uart6850_irq, m6850intr, 0, "MIDI6850", NULL) < 0)
300                 return 0;
301 
302         ok = reset_uart6850();
303         uart6850_detected = ok;
304         return ok;
305 }
306 
307 static void __exit unload_uart6850(struct address_info *hw_config)
308 {
309         free_irq(hw_config->irq, NULL);
310         sound_unload_mididev(hw_config->slots[4]);
311 }
312 
313 static struct address_info cfg_mpu;
314 
315 static int __initdata io = -1;
316 static int __initdata irq = -1;
317 
318 module_param(io, int, 0);
319 module_param(irq, int, 0);
320 
321 static int __init init_uart6850(void)
322 {
323         cfg_mpu.io_base = io;
324         cfg_mpu.irq = irq;
325 
326         if (cfg_mpu.io_base == -1 || cfg_mpu.irq == -1) {
327                 printk(KERN_INFO "uart6850: irq and io must be set.\n");
328                 return -EINVAL;
329         }
330 
331         if (probe_uart6850(&cfg_mpu))
332                 return -ENODEV;
333         attach_uart6850(&cfg_mpu);
334 
335         return 0;
336 }
337 
338 static void __exit cleanup_uart6850(void)
339 {
340         unload_uart6850(&cfg_mpu);
341 }
342 
343 module_init(init_uart6850);
344 module_exit(cleanup_uart6850);
345 
346 #ifndef MODULE
347 static int __init setup_uart6850(char *str)
348 {
349         /* io, irq */
350         int ints[3];
351         
352         str = get_options(str, ARRAY_SIZE(ints), ints);
353         
354         io = ints[1];
355         irq = ints[2];
356 
357         return 1;
358 }
359 __setup("uart6850=", setup_uart6850);
360 #endif
361 MODULE_LICENSE("GPL");
362 

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