Linux Audio

Check our new training course

Embedded Linux Audio

Check our new training course
with Creative Commons CC-BY-SA
lecture materials

Bootlin logo

Elixir Cross Referencer

Loading...
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
/*
 *  arch/m68k/q40/config.c
 *
 * originally based on:
 *
 *  linux/bvme/config.c
 *
 *  Copyright (C) 1993 Hamish Macdonald
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file README.legal in the main directory of this archive
 * for more details.
 */

#include <stdarg.h>
#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/kd.h>
#include <linux/tty.h>
#include <linux/console.h>
#include <linux/linkage.h>
#include <linux/init.h>
#include <linux/major.h>

#include <asm/bootinfo.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/setup.h>
#include <asm/irq.h>
#include <asm/traps.h>
#include <asm/machdep.h>
#include <asm/q40_master.h>
#include <asm/keyboard.h>

extern void fd_floppy_eject(void);
extern void fd_floppy_setup(char *str, int *ints);

extern void q40_process_int (int level, struct pt_regs *regs);
extern void (*q40_sys_default_handler[]) (int, void *, struct pt_regs *);  /* added just for debugging */
extern void q40_init_IRQ (void);
extern void q40_free_irq (unsigned int, void *);
extern int  q40_get_irq_list (char *);
extern void q40_enable_irq (unsigned int);
extern void q40_disable_irq (unsigned int);
static void q40_get_model(char *model);
static int  q40_get_hardware_list(char *buffer);
extern int  q40_request_irq(unsigned int irq, void (*handler)(int, void *, struct pt_regs *), unsigned long flags, const char *devname, void *dev_id);
extern void q40_sched_init(void (*handler)(int, void *, struct pt_regs *));
extern int  q40_keyb_init(void);
extern int  q40_kbdrate (struct kbd_repeat *);
extern unsigned long q40_gettimeoffset (void);
extern void q40_gettod (int *year, int *mon, int *day, int *hour,
                           int *min, int *sec);
extern int q40_hwclk (int, struct hwclk_time *);
extern int q40_set_clock_mmss (unsigned long);
extern void q40_reset (void);
extern void q40_waitbut(void);
void q40_set_vectors (void);
extern void (*kd_mksound)(unsigned int, unsigned int);
void q40_mksound(unsigned int /*freq*/, unsigned int /*ticks*/ );

extern char *saved_command_line;
extern char m68k_debug_device[];
static void q40_mem_console_write(struct console *co, const char *b,
				    unsigned int count);

static int ql_ticks=0;
static int sound_ticks=0;

static unsigned char bcd2bin (unsigned char b);
static unsigned char bin2bcd (unsigned char b);

static int q40_wait_key(struct console *co){return 0;}
static struct console q40_console_driver = {
	"debug",
	NULL,			/* write */
	NULL,			/* read */
	NULL,			/* device */
	q40_wait_key,		/* wait_key */
	NULL,			/* unblank */
	NULL,			/* setup */
	CON_PRINTBUFFER,
	-1,
	0,
	NULL
};


/* Save tick handler routine pointer, will point to do_timer() in
 * kernel/sched.c */

/* static void (*tick_handler)(int, void *, struct pt_regs *); */


/* early debugging function:*/
extern char *q40_mem_cptr; /*=(char *)0xff020000;*/
static int _cpleft;

static void q40_mem_console_write(struct console *co, const char *s,
				  unsigned int count)
{
  char *p=(char *)s;

  if (count<_cpleft)
    while (count-- >0){
      *q40_mem_cptr=*p++;
      q40_mem_cptr+=4;
      _cpleft--;
    }
}
#if 0
void printq40(char *str)
{
  int l=strlen(str);
  char *p=q40_mem_cptr;

  while (l-- >0 && _cpleft-- >0)
    {
      *p=*str++;
      p+=4;
    }
  q40_mem_cptr=p;
}
#endif

#if 0
int q40_kbdrate (struct kbd_repeat *k)
{
	return 0;
}
#endif

void q40_reset()
{

	printk ("\n\n*******************************************\n"
                     "Called q40_reset : press the RESET button!! \n");
	printk(     "*******************************************\n");

	while(1)
		;
}

static void q40_get_model(char *model)
{
    sprintf(model, "Q40");
}


/* No hardware options on Q40? */

static int q40_get_hardware_list(char *buffer)
{
    *buffer = '\0';
    return 0;
}


__initfunc(void config_q40(void))
{
    mach_sched_init      = q40_sched_init;           /* ok */
    /*mach_kbdrate         = q40_kbdrate;*/          /* unneeded ?*/
    mach_keyb_init       = q40_keyb_init;            /* OK */
    mach_init_IRQ        = q40_init_IRQ;   
    mach_gettimeoffset   = q40_gettimeoffset; 
    mach_gettod  	 = q40_gettod;
    mach_hwclk           = q40_hwclk; 
    mach_set_clock_mmss	 = q40_set_clock_mmss;
/*  mach_mksound         = q40_mksound; */
    mach_reset		 = q40_reset;           /* use reset button instead !*/
    mach_free_irq	 = q40_free_irq; 
    mach_process_int	 = q40_process_int;
    mach_get_irq_list	 = q40_get_irq_list;
    mach_request_irq	 = q40_request_irq;
    enable_irq		 = q40_enable_irq;
    disable_irq          = q40_disable_irq;
    mach_default_handler = &q40_sys_default_handler;
    mach_get_model       = q40_get_model; /* no use..*/
    mach_get_hardware_list = q40_get_hardware_list; /* no use */
    kd_mksound             = q40_mksound;
    /*mach_kbd_leds        = q40kbd_leds;*/
#ifdef CONFIG_MAGIC_SYSRQ
    mach_sysrq_key       = 0x54;
#endif
    conswitchp = &dummy_con;
#ifdef CONFIG_BLK_DEV_FD
    mach_floppy_setup    = fd_floppy_setup;
    mach_floppy_eject    = fd_floppy_eject;
    /**/
#endif

    mach_max_dma_address = 0;   /* no DMA at all */


/* userfull for early debuging stages writes kernel messages into SRAM */

    if (!strncmp( m68k_debug_device,"mem",3 ))
      {
	/*printk("using NVRAM debug, q40_mem_cptr=%p\n",q40_mem_cptr);*/
	_cpleft=2000-((long)q40_mem_cptr-0xff020000)/4;
	q40_console_driver.write = q40_mem_console_write;
	register_console(&q40_console_driver);
      }
}


int q40_parse_bootinfo(const struct bi_record *rec)
{
  return 1;  /* unknown */
}

#define DAC_LEFT  ((unsigned char *)0xff008000)
#define DAC_RIGHT ((unsigned char *)0xff008004)
void q40_mksound(unsigned int hz, unsigned int ticks)
{
  /* for now ignore hz, except that hz==0 switches off sound */
  /* simply alternate the ampl 0-255-0-.. at 200Hz */
  if (hz==0)
    {
      if (sound_ticks)
	sound_ticks=1; /* atomic - no irq spinlock used */

      *DAC_LEFT=0;
      *DAC_RIGHT=0;

      return;
    }
  /* sound itself is done in q40_timer_int */
  if (sound_ticks == 0) sound_ticks=1000; /* pretty long beep */
  sound_ticks=ticks<<1;
}

static void (*q40_timer_routine)(int, void *, struct pt_regs *);

static void q40_timer_int (int irq, void *dev_id, struct pt_regs *fp)
{
#if (HZ==10000)
    master_outb(-1,SAMPLE_CLEAR_REG);
#else /* must be 50 or 100 */
    master_outb(-1,FRAME_CLEAR_REG);
#endif

#if (HZ==100)
    ql_ticks = ql_ticks ? 0 : 1;
    if (sound_ticks)
      {
	unsigned char sval=(sound_ticks & 1) ? 0 : 255;
	sound_ticks--;
	*DAC_LEFT=sval;
	*DAC_RIGHT=sval;
      }
    if (ql_ticks) return;
#endif
    q40_timer_routine(irq, dev_id, fp);
}


void q40_sched_init (void (*timer_routine)(int, void *, struct pt_regs *))
{
    int timer_irq;

    q40_timer_routine = timer_routine;

#if (HZ==10000)
    timer_irq=Q40_IRQ_TIMER;
#else
    timer_irq=Q40_IRQ_FRAME;
#endif

    /*printk("registering sched/timer IRQ %d\n", timer_irq);*/

    if (request_irq(timer_irq, q40_timer_int, 0,
				"timer", q40_timer_int))
	panic ("Couldn't register timer int");

#if (HZ==10000)
    master_outb(SAMPLE_LOW,SAMPLE_RATE_REG);
    master_outb(-1,SAMPLE_CLEAR_REG);
    master_outb(1,SAMPLE_ENABLE_REG);
#else
    master_outb(-1,FRAME_CLEAR_REG);   /* not necessary ? */
#if (HZ==100)
    master_outb( 1,FRAME_RATE_REG);
#endif
#endif
}


unsigned long q40_gettimeoffset (void)
{
#if (HZ==100)
    return 5000*(ql_ticks!=0);
#else
    return 0;
#endif
}

extern void q40_gettod (int *year, int *mon, int *day, int *hour,
                           int *min, int *sec)
{
	RTC_CTRL |= RTC_READ;
	*year = bcd2bin (RTC_YEAR);
	*mon = bcd2bin (RTC_MNTH)-1;
	*day = bcd2bin (RTC_DATE);
	*hour = bcd2bin (RTC_HOUR);
	*min = bcd2bin (RTC_MINS);
	*sec = bcd2bin (RTC_SECS);
	RTC_CTRL &= ~(RTC_READ);

}

static unsigned char bcd2bin (unsigned char b)
{
	return ((b>>4)*10 + (b&15));
}

static unsigned char bin2bcd (unsigned char b)
{
	return (((b/10)*16) + (b%10));
}


/*
 * Looks like op is non-zero for setting the clock, and zero for
 * reading the clock.
 *
 *  struct hwclk_time {
 *         unsigned        sec;       0..59
 *         unsigned        min;       0..59
 *         unsigned        hour;      0..23
 *         unsigned        day;       1..31
 *         unsigned        mon;       0..11
 *         unsigned        year;      00...
 *         int             wday;      0..6, 0 is Sunday, -1 means unknown/don't set
 * };
 */

int q40_hwclk(int op, struct hwclk_time *t)
{
        if (op)
	{	/* Write.... */
	        RTC_CTRL |= RTC_WRITE;

		RTC_SECS = bin2bcd(t->sec);
		RTC_MINS = bin2bcd(t->min);
		RTC_HOUR = bin2bcd(t->hour);
		RTC_DATE = bin2bcd(t->day);
		RTC_MNTH = bin2bcd(t->mon + 1);
		RTC_YEAR = bin2bcd(t->year%100);
		if (t->wday >= 0)
			RTC_DOW = bin2bcd(t->wday+1);

	        RTC_CTRL &= ~(RTC_WRITE);
	}
	else
	{	/* Read....  */
	  RTC_CTRL |= RTC_READ;

	  t->year = bcd2bin (RTC_YEAR);
	  t->mon  = bcd2bin (RTC_MNTH)-1;
	  t->day  = bcd2bin (RTC_DATE);
	  t->hour = bcd2bin (RTC_HOUR);
	  t->min  = bcd2bin (RTC_MINS);
	  t->sec  = bcd2bin (RTC_SECS);

	  RTC_CTRL &= ~(RTC_READ);
	  
	  if (t->year < 70)
	    t->year += 100;
	  t->wday = bcd2bin(RTC_DOW)-1;

	}

	return 0;
}

/*
 * Set the minutes and seconds from seconds value 'nowtime'.  Fail if
 * clock is out by > 30 minutes.  Logic lifted from atari code.
 * Algorithm is to wait for the 10ms register to change, and then to
 * wait a short while, and then set it.
 */

int q40_set_clock_mmss (unsigned long nowtime)
{
	int retval = 0;
	short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;

	int rtc_minutes;


	rtc_minutes = bcd2bin (RTC_MINS);

	if ((rtc_minutes < real_minutes
		? real_minutes - rtc_minutes
			: rtc_minutes - real_minutes) < 30)
	{	   
	        RTC_CTRL |= RTC_WRITE;
		RTC_MINS = bin2bcd(real_minutes);
		RTC_SECS = bin2bcd(real_seconds);
		RTC_CTRL &= ~(RTC_WRITE);
	}
	else
		retval = -1;


	return retval;
}

extern void q40kbd_init_hw(void);

int q40_keyb_init (void)
{
        q40kbd_init_hw();
	return 0;
}

#if 0
/* dummy to cause */
void q40_slow_io()
{
  return;
}
#endif