aboutsummaryrefslogtreecommitdiffstats
path: root/arch/m68k/mac/debug.c
blob: 4eeb09dc0e8fc43576cff99ae9a3023cc782f465 (plain) (blame)
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
/*
 * linux/arch/m68k/mac/debug.c
 *
 * Shamelessly stolen (SCC code and general framework) from:
 *
 * linux/arch/m68k/atari/debug.c
 *
 * Atari debugging and serial console stuff
 *
 * Assembled of parts of former atari/config.c 97-12-18 by Roman Hodek
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#include <linux/types.h>
#include <linux/sched.h>
#include <linux/tty.h>
#include <linux/console.h>
#include <linux/init.h>
#include <linux/delay.h>

#define BOOTINFO_COMPAT_1_0
#include <asm/setup.h>
#include <asm/bootinfo.h>
#include <asm/machw.h>
#include <asm/macints.h>

extern char m68k_debug_device[];

extern struct compat_bootinfo compat_boot_info;

extern unsigned long mac_videobase;
extern unsigned long mac_videodepth;
extern unsigned long mac_rowbytes;

extern void mac_serial_print(const char *);

#define DEBUG_HEADS
#undef DEBUG_SCREEN
#define DEBUG_SERIAL

/*
 * These two auxiliary debug functions should go away ASAP. Only usage:
 * before the console output is up (after head.S come some other crucial
 * setup routines :-) it permits writing 'data' to the screen as bit patterns
 * (good luck reading those). Helped to figure that the bootinfo contained
 * garbage data on the amount and size of memory chunks ...
 *
 * The 'pos' argument now simply means 'linefeed after print' ...
 */

#ifdef DEBUG_SCREEN
static int peng=0, line=0;
#endif

void mac_debugging_short(int pos, short num)
{
#ifdef DEBUG_SCREEN
	unsigned char *pengoffset;
	unsigned char *pptr;
	int i;
#endif

#ifdef DEBUG_SERIAL
	printk("debug: %d !\n", num);
#endif

#ifdef DEBUG_SCREEN
	if (!MACH_IS_MAC) {
		/* printk("debug: %d !\n", num); */
		return;
	}

	/* calculate current offset */
	pengoffset=(unsigned char *)(mac_videobase+(150+line*2)*mac_rowbytes)
		    +80*peng;

	pptr=pengoffset;

	for(i=0;i<8*sizeof(short);i++) /* # of bits */
	{
		/*        value        mask for bit i, reverse order */
		*pptr++ = (num & ( 1 << (8*sizeof(short)-i-1) ) ? 0xFF : 0x00);
	}

	peng++;

	if (pos) {
		line++;
		peng = 0;
	}
#endif
}

void mac_debugging_long(int pos, long addr)
{
#ifdef DEBUG_SCREEN
	unsigned char *pengoffset;
	unsigned char *pptr;
	int i;
#endif

#ifdef DEBUG_SERIAL
	printk("debug: #%ld !\n", addr);
#endif

#ifdef DEBUG_SCREEN
	if (!MACH_IS_MAC) {
		/* printk("debug: #%ld !\n", addr); */
		return;
	}

	pengoffset=(unsigned char *)(mac_videobase+(150+line*2)*mac_rowbytes)
		    +80*peng;

	pptr=pengoffset;

	for(i=0;i<8*sizeof(long);i++) /* # of bits */
	{
		*pptr++ = (addr & ( 1 << (8*sizeof(long)-i-1) ) ? 0xFF : 0x00);
	}

	peng++;

	if (pos) {
		line++;
		peng = 0;
	}
#endif
}

#ifdef DEBUG_SERIAL
/*
 * TODO: serial debug code
 */

struct mac_SCC
 {
  u_char cha_b_ctrl;
  u_char char_dummy1;
  u_char cha_a_ctrl;
  u_char char_dummy2;
  u_char cha_b_data;
  u_char char_dummy3;
  u_char cha_a_data;
 };

# define scc (*((volatile struct mac_SCC*)mac_bi_data.sccbase))

/* Flag that serial port is already initialized and used */
int mac_SCC_init_done;
/* Can be set somewhere, if a SCC master reset has already be done and should
 * not be repeated; used by kgdb */
int mac_SCC_reset_done;

static int scc_port = -1;

static struct console mac_console_driver = {
	.name =		"debug",
	.flags =	CON_PRINTBUFFER,
	.index =	-1,
};

/*
 * Crude hack to get console output to the screen before the framebuffer
 * is initialized (happens a lot later in 2.1!).
 * We just use the console routines declared in head.S, this will interfere
 * with regular framebuffer console output and should be used exclusively
 * to debug kernel problems manifesting before framebuffer init (aka WSOD)
 *
 * To keep this hack from interfering with the regular console driver, either
 * deregister this driver before/on framebuffer console init, or silence this
 * function after the fbcon driver is running (will lose console messages!?).
 * To debug real early bugs, need to write a 'mac_register_console_hack()'
 * that is called from start_kernel() before setup_arch() and just registers
 * this driver if Mac.
 */

void mac_debug_console_write (struct console *co, const char *str,
			      unsigned int count)
{
	mac_serial_print(str);
}



/* Mac: loops_per_jiffy min. 19000 ^= .5 us; MFPDELAY was 0.6 us*/

#define uSEC 1

static inline void mac_sccb_out (char c)
{
    int i;
    do {
	for( i = uSEC; i > 0; --i )
		barrier();
    } while (!(scc.cha_b_ctrl & 0x04)); /* wait for tx buf empty */
    for( i = uSEC; i > 0; --i )
	barrier();
    scc.cha_b_data = c;
}

static inline void mac_scca_out (char c)
{
    int i;
    do {
	for( i = uSEC; i > 0; --i )
		barrier();
    } while (!(scc.cha_a_ctrl & 0x04)); /* wait for tx buf empty */
    for( i = uSEC; i > 0; --i )
	barrier();
    scc.cha_a_data = c;
}

void mac_sccb_console_write (struct console *co, const char *str,
			      unsigned int count)
{
    while (count--) {
	if (*str == '\n')
	    mac_sccb_out( '\r' );
	mac_sccb_out( *str++ );
    }
}

void mac_scca_console_write (struct console *co, const char *str,
			      unsigned int count)
{
    while (count--) {
	if (*str == '\n')
	    mac_scca_out( '\r' );
	mac_scca_out( *str++ );
    }
}


/* The following two functions do a quick'n'dirty initialization of the MFP or
 * SCC serial ports. They're used by the debugging interface, kgdb, and the
 * serial console code. */
#define SCCB_WRITE(reg,val)				\
    do {						\
	int i;						\
	scc.cha_b_ctrl = (reg);				\
	for( i = uSEC; i > 0; --i )			\
		barrier();				\
	scc.cha_b_ctrl = (val);				\
	for( i = uSEC; i > 0; --i )			\
		barrier();				\
    } while(0)

#define SCCA_WRITE(reg,val)				\
    do {						\
	int i;						\
	scc.cha_a_ctrl = (reg);				\
	for( i = uSEC; i > 0; --i )			\
		barrier();				\
	scc.cha_a_ctrl = (val);				\
	for( i = uSEC; i > 0; --i )			\
		barrier();				\
    } while(0)

/* loops_per_jiffy isn't initialized yet, so we can't use udelay(). This does a
 * delay of ~ 60us. */
/* Mac: loops_per_jiffy min. 19000 ^= .5 us; MFPDELAY was 0.6 us*/
#define LONG_DELAY()				\
    do {					\
	int i;					\
	for( i = 60*uSEC; i > 0; --i )		\
	    barrier();				\
    } while(0)

#ifndef CONFIG_SERIAL_CONSOLE
static void __init mac_init_scc_port( int cflag, int port )
#else
void mac_init_scc_port( int cflag, int port )
#endif
{
	extern int mac_SCC_reset_done;

	/*
	 * baud rates: 1200, 1800, 2400, 4800, 9600, 19.2k, 38.4k, 57.6k, 115.2k
	 */

	static int clksrc_table[9] =
		/* reg 11: 0x50 = BRG, 0x00 = RTxC, 0x28 = TRxC */
		{ 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x00, 0x00 };
	static int clkmode_table[9] =
		/* reg 4: 0x40 = x16, 0x80 = x32, 0xc0 = x64 */
		{ 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0xc0, 0x80 };
	static int div_table[9] =
		/* reg12 (BRG low) */
		{ 94, 62, 46, 22, 10, 4, 1, 0, 0 };

    int baud = cflag & CBAUD;
    int clksrc, clkmode, div, reg3, reg5;

    if (cflag & CBAUDEX)
	baud += B38400;
    if (baud < B1200 || baud > B38400+2)
	baud = B9600; /* use default 9600bps for non-implemented rates */
    baud -= B1200; /* tables starts at 1200bps */

    clksrc  = clksrc_table[baud];
    clkmode = clkmode_table[baud];
    div     = div_table[baud];

    reg3 = (((cflag & CSIZE) == CS8) ? 0xc0 : 0x40);
    reg5 = (((cflag & CSIZE) == CS8) ? 0x60 : 0x20) | 0x82 /* assert DTR/RTS */;

    if (port == 1) {
	    (void)scc.cha_b_ctrl;	/* reset reg pointer */
	    SCCB_WRITE( 9, 0xc0 );	/* reset */
	    LONG_DELAY();		/* extra delay after WR9 access */
	    SCCB_WRITE( 4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03) : 0 |
			  0x04 /* 1 stopbit */ |
			  clkmode );
	    SCCB_WRITE( 3, reg3 );
	    SCCB_WRITE( 5, reg5 );
	    SCCB_WRITE( 9, 0 );		/* no interrupts */
	    LONG_DELAY();		/* extra delay after WR9 access */
	    SCCB_WRITE( 10, 0 );	/* NRZ mode */
	    SCCB_WRITE( 11, clksrc );	/* main clock source */
	    SCCB_WRITE( 12, div );	/* BRG value */
	    SCCB_WRITE( 13, 0 );		/* BRG high byte */
	    SCCB_WRITE( 14, 1 );
	    SCCB_WRITE( 3, reg3 | 1 );
	    SCCB_WRITE( 5, reg5 | 8 );
    } else if (port == 0) {
	    (void)scc.cha_a_ctrl;	/* reset reg pointer */
	    SCCA_WRITE( 9, 0xc0 );	/* reset */
	    LONG_DELAY();		/* extra delay after WR9 access */
	    SCCA_WRITE( 4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03) : 0 |
			  0x04 /* 1 stopbit */ |
			  clkmode );
	    SCCA_WRITE( 3, reg3 );
	    SCCA_WRITE( 5, reg5 );
	    SCCA_WRITE( 9, 0 );		/* no interrupts */
	    LONG_DELAY();		/* extra delay after WR9 access */
	    SCCA_WRITE( 10, 0 );	/* NRZ mode */
	    SCCA_WRITE( 11, clksrc );	/* main clock source */
	    SCCA_WRITE( 12, div );	/* BRG value */
	    SCCA_WRITE( 13, 0 );		/* BRG high byte */
	    SCCA_WRITE( 14, 1 );
	    SCCA_WRITE( 3, reg3 | 1 );
	    SCCA_WRITE( 5, reg5 | 8 );
    }

    mac_SCC_reset_done = 1;
    mac_SCC_init_done = 1;
}
#endif /* DEBUG_SERIAL */

void mac_init_scca_port( int cflag )
{
	mac_init_scc_port(cflag, 0);
}

void mac_init_sccb_port( int cflag )
{
	mac_init_scc_port(cflag, 1);
}

void __init mac_debug_init(void)
{
#ifdef DEBUG_SERIAL
    if (   !strcmp( m68k_debug_device, "ser"  )
        || !strcmp( m68k_debug_device, "ser1" )) {
	/* Mac modem port */
	mac_init_scc_port( B9600|CS8, 0 );
	mac_console_driver.write = mac_scca_console_write;
	scc_port = 0;
    }
    else if (!strcmp( m68k_debug_device, "ser2" )) {
	/* Mac printer port */
	mac_init_scc_port( B9600|CS8, 1 );
	mac_console_driver.write = mac_sccb_console_write;
	scc_port = 1;
    }
#endif
#ifdef DEBUG_HEADS
    if (   !strcmp( m68k_debug_device, "scn"  )
        || !strcmp( m68k_debug_device, "con" )) {
	/* display, using head.S console routines */
	mac_console_driver.write = mac_debug_console_write;
    }
#endif
    if (mac_console_driver.write)
	register_console(&mac_console_driver);
}

/*
 * Local variables:
 *  c-indent-level: 4
 *  tab-width: 8
 * End:
 */