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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [drivers/] [sound/] [uart401.c] - Blame information for rev 1765

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/*
 * sound/uart401.c
 *
 * MPU-401 UART driver (formerly uart401_midi.c)
 */
/*
 * Copyright (C) by Hannu Savolainen 1993-1996
 *
 * USS/Lite for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
 * Version 2 (June 1991). See the "COPYING" file distributed with this software
 * for more info.
 */
#include <linux/config.h>
 
 
#include "sound_config.h"
 
#if defined(CONFIG_UART401) && defined(CONFIG_MIDI)
 
typedef struct uart401_devc
  {
    int             base;
    int             irq;
    int            *osp;
    void            (*midi_input_intr) (int dev, unsigned char data);
    int             opened;
    volatile unsigned char input_byte;
    int             my_dev;
    int             share_irq;
  }
uart401_devc;
 
static uart401_devc *detected_devc = NULL;
static uart401_devc *irq2devc[16] =
{NULL};
 
#define DATAPORT   (devc->base)
#define COMDPORT   (devc->base+1)
#define STATPORT   (devc->base+1)
 
static int
uart401_status (uart401_devc * devc)
{
  return inb (STATPORT);
}
#define input_avail(devc) (!(uart401_status(devc)&INPUT_AVAIL))
#define output_ready(devc)      (!(uart401_status(devc)&OUTPUT_READY))
static void
uart401_cmd (uart401_devc * devc, unsigned char cmd)
{
  outb (cmd, COMDPORT);
}
static int
uart401_read (uart401_devc * devc)
{
  return inb (DATAPORT);
}
static void
uart401_write (uart401_devc * devc, unsigned char byte)
{
  outb (byte, DATAPORT);
}
 
#define OUTPUT_READY    0x40
#define INPUT_AVAIL     0x80
#define MPU_ACK         0xFE
#define MPU_RESET       0xFF
#define UART_MODE_ON    0x3F
 
static int      reset_uart401 (uart401_devc * devc);
 
static void
uart401_input_loop (uart401_devc * devc)
{
  while (input_avail (devc))
    {
      unsigned char   c = uart401_read (devc);
 
      if (c == MPU_ACK)
        devc->input_byte = c;
      else if (devc->opened & OPEN_READ && devc->midi_input_intr)
        devc->midi_input_intr (devc->my_dev, c);
    }
}
 
void
uart401intr (int irq, void *dev_id, struct pt_regs *dummy)
{
  uart401_devc   *devc;
 
  if (irq < 1 || irq > 15)
    return;
 
  devc = irq2devc[irq];
 
  if (devc == NULL)
    return;
 
  if (input_avail (devc))
    uart401_input_loop (devc);
}
 
static int
uart401_open (int dev, int mode,
              void            (*input) (int dev, unsigned char data),
              void            (*output) (int dev)
)
{
  uart401_devc   *devc = (uart401_devc *) midi_devs[dev]->devc;
 
  if (devc->opened)
    {
      return -(EBUSY);
    }
 
  while (input_avail (devc))
    uart401_read (devc);
 
  devc->midi_input_intr = input;
  devc->opened = mode;
 
  return 0;
}
 
static void
uart401_close (int dev)
{
  uart401_devc   *devc = (uart401_devc *) midi_devs[dev]->devc;
 
  devc->opened = 0;
}
 
static int
uart401_out (int dev, unsigned char midi_byte)
{
  int             timeout;
  unsigned long   flags;
  uart401_devc   *devc = (uart401_devc *) midi_devs[dev]->devc;
 
  /*
   * Test for input since pending input seems to block the output.
   */
 
  save_flags (flags);
  cli ();
 
  if (input_avail (devc))
    uart401_input_loop (devc);
 
  restore_flags (flags);
 
  /*
   * Sometimes it takes about 13000 loops before the output becomes ready
   * (After reset). Normally it takes just about 10 loops.
   */
 
  for (timeout = 30000; timeout > 0 && !output_ready (devc); timeout--);
 
  if (!output_ready (devc))
    {
      printk ("MPU-401: Timeout\n");
      return 0;
    }
 
  uart401_write (devc, midi_byte);
  return 1;
}
 
static int
uart401_start_read (int dev)
{
  return 0;
}
 
static int
uart401_end_read (int dev)
{
  return 0;
}
 
static int
uart401_ioctl (int dev, unsigned cmd, caddr_t arg)
{
  return -(EINVAL);
}
 
static void
uart401_kick (int dev)
{
}
 
static int
uart401_buffer_status (int dev)
{
  return 0;
}
 
#define MIDI_SYNTH_NAME "MPU-401 UART"
#define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
#include "midi_synth.h"
 
static struct midi_operations uart401_operations =
{
  {"MPU-401 (UART) MIDI", 0, 0, SNDCARD_MPU401},
  &std_midi_synth,
  {0},
  uart401_open,
  uart401_close,
  uart401_ioctl,
  uart401_out,
  uart401_start_read,
  uart401_end_read,
  uart401_kick,
  NULL,
  uart401_buffer_status,
  NULL
};
 
static void
enter_uart_mode (uart401_devc * devc)
{
  int             ok, timeout;
  unsigned long   flags;
 
  save_flags (flags);
  cli ();
  for (timeout = 30000; timeout < 0 && !output_ready (devc); timeout--);
 
  devc->input_byte = 0;
  uart401_cmd (devc, UART_MODE_ON);
 
  ok = 0;
  for (timeout = 50000; timeout > 0 && !ok; timeout--)
    if (devc->input_byte == MPU_ACK)
      ok = 1;
    else if (input_avail (devc))
      if (uart401_read (devc) == MPU_ACK)
        ok = 1;
 
  restore_flags (flags);
}
 
void
attach_uart401 (struct address_info *hw_config)
{
  uart401_devc   *devc;
  char           *name = "MPU-401 (UART) MIDI";
 
  if (hw_config->name)
    name = hw_config->name;
 
  if (detected_devc == NULL)
    return;
 
 
  devc = (uart401_devc *) (sound_mem_blocks[sound_nblocks] = vmalloc (sizeof (uart401_devc)));
  if (sound_nblocks < 1024)
    sound_nblocks++;;
  if (devc == NULL)
    {
      printk ("uart401: Can't allocate memory\n");
      return;
    }
 
  memcpy ((char *) devc, (char *) detected_devc, sizeof (uart401_devc));
  detected_devc = NULL;
 
  devc->irq = hw_config->irq;
  if (devc->irq < 0)
    {
      devc->share_irq = 1;
      devc->irq *= -1;
    }
  else
    devc->share_irq = 0;
 
  if (devc->irq < 1 || devc->irq > 15)
    return;
 
  if (!devc->share_irq)
    if (snd_set_irq_handler (devc->irq, uart401intr, "uart401", devc->osp) < 0)
      {
        printk ("uart401: Failed to allocate IRQ%d\n", devc->irq);
        return;
      }
 
  irq2devc[devc->irq] = devc;
  devc->my_dev = num_midis;
 
  request_region (hw_config->io_base, 4, "SB MIDI");
  enter_uart_mode (devc);
 
  if (num_midis >= MAX_MIDI_DEV)
    {
      printk ("Sound: Too many midi devices detected\n");
      return;
    }
 
  conf_printf (name, hw_config);
 
  std_midi_synth.midi_dev = devc->my_dev = num_midis;
 
 
  midi_devs[num_midis] = (struct midi_operations *) (sound_mem_blocks[sound_nblocks] = vmalloc (sizeof (struct midi_operations)));
 
  if (sound_nblocks < 1024)
    sound_nblocks++;;
  if (midi_devs[num_midis] == NULL)
    {
      printk ("uart401: Failed to allocate memory\n");
      return;
    }
 
  memcpy ((char *) midi_devs[num_midis], (char *) &uart401_operations,
          sizeof (struct midi_operations));
 
  midi_devs[num_midis]->devc = devc;
 
 
  midi_devs[num_midis]->converter = (struct synth_operations *) (sound_mem_blocks[sound_nblocks] = vmalloc (sizeof (struct synth_operations)));
 
  if (sound_nblocks < 1024)
    sound_nblocks++;;
 
  if (midi_devs[num_midis]->converter == NULL)
    {
      printk ("uart401: Failed to allocate memory\n");
      return;
    }
 
  memcpy ((char *) midi_devs[num_midis]->converter, (char *) &std_midi_synth,
          sizeof (struct synth_operations));
 
  strcpy (midi_devs[num_midis]->info.name, name);
  num_midis++;
  devc->opened = 0;
}
 
static int
reset_uart401 (uart401_devc * devc)
{
  int             ok, timeout, n;
 
  /*
   * Send the RESET command. Try again if no success at the first time.
   */
 
  ok = 0;
 
  /* save_flags(flags);cli(); */
 
  for (n = 0; n < 2 && !ok; n++)
    {
      for (timeout = 30000; timeout < 0 && !output_ready (devc); timeout--);
 
      devc->input_byte = 0;
      uart401_cmd (devc, MPU_RESET);
 
      /*
       * Wait at least 25 msec. This method is not accurate so let's make the
       * loop bit longer. Cannot sleep since this is called during boot.
       */
 
      for (timeout = 50000; timeout > 0 && !ok; timeout--)
        if (devc->input_byte == MPU_ACK)        /* Interrupt */
          ok = 1;
        else if (input_avail (devc))
          if (uart401_read (devc) == MPU_ACK)
            ok = 1;
 
    }
 
  if (ok)
    uart401_input_loop (devc);  /*
                                 * Flush input before enabling interrupts
                                 */
 
  /* restore_flags(flags); */
 
  return ok;
}
 
int
probe_uart401 (struct address_info *hw_config)
{
  int             ok = 0;
 
  static uart401_devc hw_info;
  uart401_devc   *devc = &hw_info;
 
  detected_devc = NULL;
 
  if (check_region (hw_config->io_base, 4))
    return 0;
 
  devc->base = hw_config->io_base;
  devc->irq = hw_config->irq;
  devc->osp = hw_config->osp;
  devc->midi_input_intr = NULL;
  devc->opened = 0;
  devc->input_byte = 0;
  devc->my_dev = 0;
  devc->share_irq = 0;
 
  ok = reset_uart401 (devc);
 
  if (ok)
    detected_devc = devc;
 
  return ok;
}
 
void
unload_uart401 (struct address_info *hw_config)
{
  uart401_devc   *devc;
 
  int             irq = hw_config->irq;
 
  if (irq < 0)
    irq *= -1;
 
  if (irq < 1 || irq > 15)
    return;
 
  devc = irq2devc[irq];
  if (devc == NULL)
    return;
 
  reset_uart401 (devc);
 
  release_region (hw_config->io_base, 4);
 
  if (!devc->share_irq)
    snd_release_irq (devc->irq);
}
 
 
#endif

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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [drivers/] [sound/] [uart401.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1626	jcastillo	`/*`
2			`* sound/uart401.c`
3			`*`
4			`* MPU-401 UART driver (formerly uart401_midi.c)`
5			`*/`
6			`/*`
7			`* Copyright (C) by Hannu Savolainen 1993-1996`
8			`*`
9			`* USS/Lite 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			`#include <linux/config.h>`
14
15
16			`#include "sound_config.h"`
17
18			`#if defined(CONFIG_UART401) && defined(CONFIG_MIDI)`
19
20			`typedef struct uart401_devc`
21			`{`
22			`int base;`
23			`int irq;`
24			`int *osp;`
25			`void (*midi_input_intr) (int dev, unsigned char data);`
26			`int opened;`
27			`volatile unsigned char input_byte;`
28			`int my_dev;`
29			`int share_irq;`
30			`}`
31			`uart401_devc;`
32
33			`static uart401_devc *detected_devc = NULL;`
34			`static uart401_devc *irq2devc[16] =`
35			`{NULL};`
36
37			`#define DATAPORT (devc->base)`
38			`#define COMDPORT (devc->base+1)`
39			`#define STATPORT (devc->base+1)`
40
41			`static int`
42			`uart401_status (uart401_devc * devc)`
43			`{`
44			`return inb (STATPORT);`
45			`}`
46			`#define input_avail(devc) (!(uart401_status(devc)&INPUT_AVAIL))`
47			`#define output_ready(devc) (!(uart401_status(devc)&OUTPUT_READY))`
48			`static void`
49			`uart401_cmd (uart401_devc * devc, unsigned char cmd)`
50			`{`
51			`outb (cmd, COMDPORT);`
52			`}`
53			`static int`
54			`uart401_read (uart401_devc * devc)`
55			`{`
56			`return inb (DATAPORT);`
57			`}`
58			`static void`
59			`uart401_write (uart401_devc * devc, unsigned char byte)`
60			`{`
61			`outb (byte, DATAPORT);`
62			`}`
63
64			`#define OUTPUT_READY 0x40`
65			`#define INPUT_AVAIL 0x80`
66			`#define MPU_ACK 0xFE`
67			`#define MPU_RESET 0xFF`
68			`#define UART_MODE_ON 0x3F`
69
70			`static int reset_uart401 (uart401_devc * devc);`
71
72			`static void`
73			`uart401_input_loop (uart401_devc * devc)`
74			`{`
75			`while (input_avail (devc))`
76			`{`
77			`unsigned char c = uart401_read (devc);`
78
79			`if (c == MPU_ACK)`
80			`devc->input_byte = c;`
81			`else if (devc->opened & OPEN_READ && devc->midi_input_intr)`
82			`devc->midi_input_intr (devc->my_dev, c);`
83			`}`
84			`}`
85
86			`void`
87			`uart401intr (int irq, void dev_id, struct pt_regs dummy)`
88			`{`
89			`uart401_devc *devc;`
90
91			`if (irq < 1 \|\| irq > 15)`
92			`return;`
93
94			`devc = irq2devc[irq];`
95
96			`if (devc == NULL)`
97			`return;`
98
99			`if (input_avail (devc))`
100			`uart401_input_loop (devc);`
101			`}`
102
103			`static int`
104			`uart401_open (int dev, int mode,`
105			`void (*input) (int dev, unsigned char data),`
106			`void (*output) (int dev)`
107			`)`
108			`{`
109			`uart401_devc devc = (uart401_devc ) midi_devs[dev]->devc;`
110
111			`if (devc->opened)`
112			`{`
113			`return -(EBUSY);`
114			`}`
115
116			`while (input_avail (devc))`
117			`uart401_read (devc);`
118
119			`devc->midi_input_intr = input;`
120			`devc->opened = mode;`
121
122			`return 0;`
123			`}`
124
125			`static void`
126			`uart401_close (int dev)`
127			`{`
128			`uart401_devc devc = (uart401_devc ) midi_devs[dev]->devc;`
129
130			`devc->opened = 0;`
131			`}`
132
133			`static int`
134			`uart401_out (int dev, unsigned char midi_byte)`
135			`{`
136			`int timeout;`
137			`unsigned long flags;`
138			`uart401_devc devc = (uart401_devc ) midi_devs[dev]->devc;`
139
140			`/*`
141			`* Test for input since pending input seems to block the output.`
142			`*/`
143
144			`save_flags (flags);`
145			`cli ();`
146
147			`if (input_avail (devc))`
148			`uart401_input_loop (devc);`
149
150			`restore_flags (flags);`
151
152			`/*`
153			`* Sometimes it takes about 13000 loops before the output becomes ready`
154			`* (After reset). Normally it takes just about 10 loops.`
155			`*/`
156
157			`for (timeout = 30000; timeout > 0 && !output_ready (devc); timeout--);`
158
159			`if (!output_ready (devc))`
160			`{`
161			`printk ("MPU-401: Timeout\n");`
162			`return 0;`
163			`}`
164
165			`uart401_write (devc, midi_byte);`
166			`return 1;`
167			`}`
168
169			`static int`
170			`uart401_start_read (int dev)`
171			`{`
172			`return 0;`
173			`}`
174
175			`static int`
176			`uart401_end_read (int dev)`
177			`{`
178			`return 0;`
179			`}`
180
181			`static int`
182			`uart401_ioctl (int dev, unsigned cmd, caddr_t arg)`
183			`{`
184			`return -(EINVAL);`
185			`}`
186
187			`static void`
188			`uart401_kick (int dev)`
189			`{`
190			`}`
191
192			`static int`
193			`uart401_buffer_status (int dev)`
194			`{`
195			`return 0;`
196			`}`
197
198			`#define MIDI_SYNTH_NAME "MPU-401 UART"`
199			`#define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT`
200			`#include "midi_synth.h"`
201
202			`static struct midi_operations uart401_operations =`
203			`{`
204			`{"MPU-401 (UART) MIDI", 0, 0, SNDCARD_MPU401},`
205			`&std_midi_synth,`
206			`{0},`
207			`uart401_open,`
208			`uart401_close,`
209			`uart401_ioctl,`
210			`uart401_out,`
211			`uart401_start_read,`
212			`uart401_end_read,`
213			`uart401_kick,`
214			`NULL,`
215			`uart401_buffer_status,`
216			`NULL`
217			`};`
218
219			`static void`
220			`enter_uart_mode (uart401_devc * devc)`
221			`{`
222			`int ok, timeout;`
223			`unsigned long flags;`
224
225			`save_flags (flags);`
226			`cli ();`
227			`for (timeout = 30000; timeout < 0 && !output_ready (devc); timeout--);`
228
229			`devc->input_byte = 0;`
230			`uart401_cmd (devc, UART_MODE_ON);`
231
232			`ok = 0;`
233			`for (timeout = 50000; timeout > 0 && !ok; timeout--)`
234			`if (devc->input_byte == MPU_ACK)`
235			`ok = 1;`
236			`else if (input_avail (devc))`
237			`if (uart401_read (devc) == MPU_ACK)`
238			`ok = 1;`
239
240			`restore_flags (flags);`
241			`}`
242
243			`void`
244			`attach_uart401 (struct address_info *hw_config)`
245			`{`
246			`uart401_devc *devc;`
247			`char *name = "MPU-401 (UART) MIDI";`
248
249			`if (hw_config->name)`
250			`name = hw_config->name;`
251
252			`if (detected_devc == NULL)`
253			`return;`
254
255
256			`devc = (uart401_devc *) (sound_mem_blocks[sound_nblocks] = vmalloc (sizeof (uart401_devc)));`
257			`if (sound_nblocks < 1024)`
258			`sound_nblocks++;;`
259			`if (devc == NULL)`
260			`{`
261			`printk ("uart401: Can't allocate memory\n");`
262			`return;`
263			`}`
264
265			`memcpy ((char ) devc, (char ) detected_devc, sizeof (uart401_devc));`
266			`detected_devc = NULL;`
267
268			`devc->irq = hw_config->irq;`
269			`if (devc->irq < 0)`
270			`{`
271			`devc->share_irq = 1;`
272			`devc->irq *= -1;`
273			`}`
274			`else`
275			`devc->share_irq = 0;`
276
277			`if (devc->irq < 1 \|\| devc->irq > 15)`
278			`return;`
279
280			`if (!devc->share_irq)`
281			`if (snd_set_irq_handler (devc->irq, uart401intr, "uart401", devc->osp) < 0)`
282			`{`
283			`printk ("uart401: Failed to allocate IRQ%d\n", devc->irq);`
284			`return;`
285			`}`
286
287			`irq2devc[devc->irq] = devc;`
288			`devc->my_dev = num_midis;`
289
290			`request_region (hw_config->io_base, 4, "SB MIDI");`
291			`enter_uart_mode (devc);`
292
293			`if (num_midis >= MAX_MIDI_DEV)`
294			`{`
295			`printk ("Sound: Too many midi devices detected\n");`
296			`return;`
297			`}`
298
299			`conf_printf (name, hw_config);`
300
301			`std_midi_synth.midi_dev = devc->my_dev = num_midis;`
302
303
304			`midi_devs[num_midis] = (struct midi_operations *) (sound_mem_blocks[sound_nblocks] = vmalloc (sizeof (struct midi_operations)));`
305
306			`if (sound_nblocks < 1024)`
307			`sound_nblocks++;;`
308			`if (midi_devs[num_midis] == NULL)`
309			`{`
310			`printk ("uart401: Failed to allocate memory\n");`
311			`return;`
312			`}`
313
314			`memcpy ((char ) midi_devs[num_midis], (char ) &uart401_operations,`
315			`sizeof (struct midi_operations));`
316
317			`midi_devs[num_midis]->devc = devc;`
318
319
320			`midi_devs[num_midis]->converter = (struct synth_operations *) (sound_mem_blocks[sound_nblocks] = vmalloc (sizeof (struct synth_operations)));`
321
322			`if (sound_nblocks < 1024)`
323			`sound_nblocks++;;`
324
325			`if (midi_devs[num_midis]->converter == NULL)`
326			`{`
327			`printk ("uart401: Failed to allocate memory\n");`
328			`return;`
329			`}`
330
331			`memcpy ((char ) midi_devs[num_midis]->converter, (char ) &std_midi_synth,`
332			`sizeof (struct synth_operations));`
333
334			`strcpy (midi_devs[num_midis]->info.name, name);`
335			`num_midis++;`
336			`devc->opened = 0;`
337			`}`
338
339			`static int`
340			`reset_uart401 (uart401_devc * devc)`
341			`{`
342			`int ok, timeout, n;`
343
344			`/*`
345			`* Send the RESET command. Try again if no success at the first time.`
346			`*/`
347
348			`ok = 0;`
349
350			`/* save_flags(flags);cli(); */`
351
352			`for (n = 0; n < 2 && !ok; n++)`
353			`{`
354			`for (timeout = 30000; timeout < 0 && !output_ready (devc); timeout--);`
355
356			`devc->input_byte = 0;`
357			`uart401_cmd (devc, MPU_RESET);`
358
359			`/*`
360			`* Wait at least 25 msec. This method is not accurate so let's make the`
361			`* loop bit longer. Cannot sleep since this is called during boot.`
362			`*/`
363
364			`for (timeout = 50000; timeout > 0 && !ok; timeout--)`
365			`if (devc->input_byte == MPU_ACK) /* Interrupt */`
366			`ok = 1;`
367			`else if (input_avail (devc))`
368			`if (uart401_read (devc) == MPU_ACK)`
369			`ok = 1;`
370
371			`}`
372
373			`if (ok)`
374			`uart401_input_loop (devc); /*`
375			`* Flush input before enabling interrupts`
376			`*/`
377
378			`/* restore_flags(flags); */`
379
380			`return ok;`
381			`}`
382
383			`int`
384			`probe_uart401 (struct address_info *hw_config)`
385			`{`
386			`int ok = 0;`
387
388			`static uart401_devc hw_info;`
389			`uart401_devc *devc = &hw_info;`
390
391			`detected_devc = NULL;`
392
393			`if (check_region (hw_config->io_base, 4))`
394			`return 0;`
395
396			`devc->base = hw_config->io_base;`
397			`devc->irq = hw_config->irq;`
398			`devc->osp = hw_config->osp;`
399			`devc->midi_input_intr = NULL;`
400			`devc->opened = 0;`
401			`devc->input_byte = 0;`
402			`devc->my_dev = 0;`
403			`devc->share_irq = 0;`
404
405			`ok = reset_uart401 (devc);`
406
407			`if (ok)`
408			`detected_devc = devc;`
409
410			`return ok;`
411			`}`
412
413			`void`
414			`unload_uart401 (struct address_info *hw_config)`
415			`{`
416			`uart401_devc *devc;`
417
418			`int irq = hw_config->irq;`
419
420			`if (irq < 0)`
421			`irq *= -1;`
422
423			`if (irq < 1 \|\| irq > 15)`
424			`return;`
425
426			`devc = irq2devc[irq];`
427			`if (devc == NULL)`
428			`return;`
429
430			`reset_uart401 (devc);`
431
432			`release_region (hw_config->io_base, 4);`
433
434			`if (!devc->share_irq)`
435			`snd_release_irq (devc->irq);`
436			`}`
437
438
439			`#endif`