summaryrefslogtreecommitdiff
path: root/cpu/mpc8xx/cpu.c
blob: 5f92a371b0f4696a3a5fff9a4fd12d5b6bc11c54 (plain)
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
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
/*
 * (C) Copyright 2000-2002
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/*
 * m8xx.c
 *
 * CPU specific code
 *
 * written or collected and sometimes rewritten by
 * Magnus Damm <damm@bitsmart.com>
 *
 * minor modifications by
 * Wolfgang Denk <wd@denx.de>
 */

#include <common.h>
#include <watchdog.h>
#include <command.h>
#include <mpc8xx.h>
#include <asm/cache.h>

static char *cpu_warning = "\n         " \
	"*** Warning: CPU Core has Silicon Bugs -- Check the Errata ***";

#if ((defined(CONFIG_MPC86x) || defined(CONFIG_MPC855)) && \
     !defined(CONFIG_MPC862))

static int check_CPU (long clock, uint pvr, uint immr)
{
	char *id_str =
# if defined(CONFIG_MPC855)
	"PC855";
# elif defined(CONFIG_MPC860P)
	"PC860P";
# else
	NULL;
# endif
	volatile immap_t *immap = (immap_t *) (immr & 0xFFFF0000);
	uint k, m;
	char buf[32];
	char pre = 'X';
	char *mid = "xx";
	char *suf;

	/* the highest 16 bits should be 0x0050 for a 860 */

	if ((pvr >> 16) != 0x0050)
		return -1;

	k = (immr << 16) | *((ushort *) & immap->im_cpm.cp_dparam[0xB0]);
	m = 0;

	/*
	 * Some boards use sockets so different CPUs can be used.
	 * We have to check chip version in run time.
	 */
	switch (k) {
	case 0x00020001: pre = 'P'; suf = ""; break;
	case 0x00030001: suf = ""; break;
	case 0x00120003: suf = "A"; break;
	case 0x00130003: suf = "A3"; break;

	case 0x00200004: suf = "B"; break;

	case 0x00300004: suf = "C"; break;
	case 0x00310004: suf = "C1"; m = 1; break;

	case 0x00200064: mid = "SR"; suf = "B"; break;
	case 0x00300065: mid = "SR"; suf = "C"; break;
	case 0x00310065: mid = "SR"; suf = "C1"; m = 1; break;
	case 0x05010000: suf = "D3"; m = 1; break;
	case 0x05020000: suf = "D4"; m = 1; break;
		/* this value is not documented anywhere */
	case 0x40000000: pre = 'P'; suf = "D"; m = 1; break;
		/* MPC866P/MPC866T/MPC859T/MPC859DSL/MPC852T */
	case 0x08000003: pre = 'M'; suf = ""; m = 1;
		if (id_str == NULL)
			id_str =
# if defined(CONFIG_MPC852T)
		"PC852T";
# elif defined(CONFIG_MPC859T)
		"PC859T";
# elif defined(CONFIG_MPC859DSL)
		"PC859DSL";
# elif defined(CONFIG_MPC866T)
		"PC866T";
# else
		"PC866x"; /* Unknown chip from MPC866 family */
# endif
		break;
	case 0x09000000: pre = 'M'; mid = suf = ""; m = 1;
		if (id_str == NULL)
			id_str = "PC885"; /* 870/875/880/885 */
		break;

	default: suf = NULL; break;
	}

	if (id_str == NULL)
		id_str = "PC86x";	/* Unknown 86x chip */
	if (suf)
		printf ("%c%s%sZPnn%s", pre, id_str, mid, suf);
	else
		printf ("unknown M%s (0x%08x)", id_str, k);


#if defined(CFG_8xx_CPUCLK_MIN) && defined(CFG_8xx_CPUCLK_MAX)
	printf (" at %s MHz [%d.%d...%d.%d MHz]\n       ",
		strmhz (buf, clock),
		CFG_8xx_CPUCLK_MIN / 1000000,
		((CFG_8xx_CPUCLK_MIN % 1000000) + 50000) / 100000,
		CFG_8xx_CPUCLK_MAX / 1000000,
		((CFG_8xx_CPUCLK_MAX % 1000000) + 50000) / 100000
	);
#else
	printf (" at %s MHz: ", strmhz (buf, clock));
#endif
	printf ("%u kB I-Cache %u kB D-Cache",
		checkicache () >> 10,
		checkdcache () >> 10
	);

	/* do we have a FEC (860T/P or 852/859/866/885)? */

	immap->im_cpm.cp_fec.fec_addr_low = 0x12345678;
	if (immap->im_cpm.cp_fec.fec_addr_low == 0x12345678) {
		printf (" FEC present");
	}

	if (!m) {
		puts (cpu_warning);
	}

	putc ('\n');

#ifdef DEBUG
	if(clock != measure_gclk()) {
	    printf ("clock %ldHz != %dHz\n", clock, measure_gclk());
	}
#endif

	return 0;
}

#elif defined(CONFIG_MPC862)

static int check_CPU (long clock, uint pvr, uint immr)
{
	volatile immap_t *immap = (immap_t *) (immr & 0xFFFF0000);
	uint k, m;
	char buf[32];
	char pre = 'X';
	char *mid = "xx";
	char *suf;

	/* the highest 16 bits should be 0x0050 for a 8xx */

	if ((pvr >> 16) != 0x0050)
		return -1;

	k = (immr << 16) | *((ushort *) & immap->im_cpm.cp_dparam[0xB0]);
	m = 0;

	switch (k) {

		/* this value is not documented anywhere */
	case 0x06000000: mid = "P"; suf = "0"; break;
	case 0x06010001: mid = "P"; suf = "A"; m = 1; break;
	case 0x07000003: mid = "P"; suf = "B"; m = 1; break;
	default: suf = NULL; break;
	}

#ifndef CONFIG_MPC857
	if (suf)
		printf ("%cPC862%sZPnn%s", pre, mid, suf);
	else
		printf ("unknown MPC862 (0x%08x)", k);
#else
	if (suf)
		printf ("%cPC857TZPnn%s", pre, suf); /* only 857T tested right now! */
	else
		printf ("unknown MPC857 (0x%08x)", k);
#endif

	printf (" at %s MHz:", strmhz (buf, clock));

	printf (" %u kB I-Cache", checkicache () >> 10);
	printf (" %u kB D-Cache", checkdcache () >> 10);

	/* lets check and see if we're running on a 862T (or P?) */

	immap->im_cpm.cp_fec.fec_addr_low = 0x12345678;
	if (immap->im_cpm.cp_fec.fec_addr_low == 0x12345678) {
		printf (" FEC present");
	}

	if (!m) {
		puts (cpu_warning);
	}

	putc ('\n');

	return 0;
}

#elif defined(CONFIG_MPC823)

static int check_CPU (long clock, uint pvr, uint immr)
{
	volatile immap_t *immap = (immap_t *) (immr & 0xFFFF0000);
	uint k, m;
	char buf[32];
	char *suf;

	/* the highest 16 bits should be 0x0050 for a 8xx */

	if ((pvr >> 16) != 0x0050)
		return -1;

	k = (immr << 16) | *((ushort *) & immap->im_cpm.cp_dparam[0xB0]);
	m = 0;

	switch (k) {
		/* MPC823 */
	case 0x20000000: suf = "0"; break;
	case 0x20010000: suf = "0.1"; break;
	case 0x20020000: suf = "Z2/3"; break;
	case 0x20020001: suf = "Z3"; break;
	case 0x21000000: suf = "A"; break;
	case 0x21010000: suf = "B"; m = 1; break;
	case 0x21010001: suf = "B2"; m = 1; break;
		/* MPC823E */
	case 0x24010000: suf = NULL;
			puts ("PPC823EZTnnB2");
			m = 1;
			break;
	default:
			suf = NULL;
			printf ("unknown MPC823 (0x%08x)", k);
			break;
	}
	if (suf)
		printf ("PPC823ZTnn%s", suf);

	printf (" at %s MHz:", strmhz (buf, clock));

	printf (" %u kB I-Cache", checkicache () >> 10);
	printf (" %u kB D-Cache", checkdcache () >> 10);

	/* lets check and see if we're running on a 860T (or P?) */

	immap->im_cpm.cp_fec.fec_addr_low = 0x12345678;
	if (immap->im_cpm.cp_fec.fec_addr_low == 0x12345678) {
		puts (" FEC present");
	}

	if (!m) {
		puts (cpu_warning);
	}

	putc ('\n');

	return 0;
}

#elif defined(CONFIG_MPC850)

static int check_CPU (long clock, uint pvr, uint immr)
{
	volatile immap_t *immap = (immap_t *) (immr & 0xFFFF0000);
	uint k, m;
	char buf[32];

	/* the highest 16 bits should be 0x0050 for a 8xx */

	if ((pvr >> 16) != 0x0050)
		return -1;

	k = (immr << 16) | *((ushort *) & immap->im_cpm.cp_dparam[0xB0]);
	m = 0;

	switch (k) {
	case 0x20020001:
		printf ("XPC850xxZT");
		break;
	case 0x21000065:
		printf ("XPC850xxZTA");
		break;
	case 0x21010067:
		printf ("XPC850xxZTB");
		m = 1;
		break;
	case 0x21020068:
		printf ("XPC850xxZTC");
		m = 1;
		break;
	default:
		printf ("unknown MPC850 (0x%08x)", k);
	}
	printf (" at %s MHz:", strmhz (buf, clock));

	printf (" %u kB I-Cache", checkicache () >> 10);
	printf (" %u kB D-Cache", checkdcache () >> 10);

	/* lets check and see if we're running on a 850T (or P?) */

	immap->im_cpm.cp_fec.fec_addr_low = 0x12345678;
	if (immap->im_cpm.cp_fec.fec_addr_low == 0x12345678) {
		printf (" FEC present");
	}

	if (!m) {
		puts (cpu_warning);
	}

	putc ('\n');

	return 0;
}
#else
#error CPU undefined
#endif
/* ------------------------------------------------------------------------- */

int checkcpu (void)
{
	DECLARE_GLOBAL_DATA_PTR;

	ulong clock = gd->cpu_clk;
	uint immr = get_immr (0);	/* Return full IMMR contents */
	uint pvr = get_pvr ();

	puts ("CPU:   ");

	/* 850 has PARTNUM 20 */
	/* 801 has PARTNUM 10 */
	return check_CPU (clock, pvr, immr);
}

/* ------------------------------------------------------------------------- */
/* L1 i-cache                                                                */
/* the standard 860 has 128 sets of 16 bytes in 2 ways (= 4 kB)              */
/* the 860 P (plus) has 256 sets of 16 bytes in 4 ways (= 16 kB)             */

int checkicache (void)
{
	volatile immap_t *immap = (immap_t *) CFG_IMMR;
	volatile memctl8xx_t *memctl = &immap->im_memctl;
	u32 cacheon = rd_ic_cst () & IDC_ENABLED;

#ifdef CONFIG_IP86x
	u32 k = memctl->memc_br1 & ~0x00007fff;	/* probe in flash memoryarea */
#else
	u32 k = memctl->memc_br0 & ~0x00007fff;	/* probe in flash memoryarea */
#endif
	u32 m;
	u32 lines = -1;

	wr_ic_cst (IDC_UNALL);
	wr_ic_cst (IDC_INVALL);
	wr_ic_cst (IDC_DISABLE);
	__asm__ volatile ("isync");

	while (!((m = rd_ic_cst ()) & IDC_CERR2)) {
		wr_ic_adr (k);
		wr_ic_cst (IDC_LDLCK);
		__asm__ volatile ("isync");

		lines++;
		k += 0x10;				/* the number of bytes in a cacheline */
	}

	wr_ic_cst (IDC_UNALL);
	wr_ic_cst (IDC_INVALL);

	if (cacheon)
		wr_ic_cst (IDC_ENABLE);
	else
		wr_ic_cst (IDC_DISABLE);

	__asm__ volatile ("isync");

	return lines << 4;
};

/* ------------------------------------------------------------------------- */
/* L1 d-cache                                                                */
/* the standard 860 has 128 sets of 16 bytes in 2 ways (= 4 kB)              */
/* the 860 P (plus) has 256 sets of 16 bytes in 2 ways (= 8 kB)              */
/* call with cache disabled                                                  */

int checkdcache (void)
{
	volatile immap_t *immap = (immap_t *) CFG_IMMR;
	volatile memctl8xx_t *memctl = &immap->im_memctl;
	u32 cacheon = rd_dc_cst () & IDC_ENABLED;

#ifdef CONFIG_IP86x
	u32 k = memctl->memc_br1 & ~0x00007fff;	/* probe in flash memoryarea */
#else
	u32 k = memctl->memc_br0 & ~0x00007fff;	/* probe in flash memoryarea */
#endif
	u32 m;
	u32 lines = -1;

	wr_dc_cst (IDC_UNALL);
	wr_dc_cst (IDC_INVALL);
	wr_dc_cst (IDC_DISABLE);

	while (!((m = rd_dc_cst ()) & IDC_CERR2)) {
		wr_dc_adr (k);
		wr_dc_cst (IDC_LDLCK);
		lines++;
		k += 0x10;	/* the number of bytes in a cacheline */
	}

	wr_dc_cst (IDC_UNALL);
	wr_dc_cst (IDC_INVALL);

	if (cacheon)
		wr_dc_cst (IDC_ENABLE);
	else
		wr_dc_cst (IDC_DISABLE);

	return lines << 4;
};

/* ------------------------------------------------------------------------- */

void upmconfig (uint upm, uint * table, uint size)
{
	uint i;
	uint addr = 0;
	volatile immap_t *immap = (immap_t *) CFG_IMMR;
	volatile memctl8xx_t *memctl = &immap->im_memctl;

	for (i = 0; i < size; i++) {
		memctl->memc_mdr = table[i];	/* (16-15) */
		memctl->memc_mcr = addr | upm;	/* (16-16) */
		addr++;
	}
}

/* ------------------------------------------------------------------------- */

int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
	ulong msr, addr;

	volatile immap_t *immap = (immap_t *) CFG_IMMR;

	immap->im_clkrst.car_plprcr |= PLPRCR_CSR;	/* Checkstop Reset enable */

	/* Interrupts and MMU off */
	__asm__ volatile ("mtspr    81, 0");
	__asm__ volatile ("mfmsr    %0":"=r" (msr));

	msr &= ~0x1030;
	__asm__ volatile ("mtmsr    %0"::"r" (msr));

	/*
	 * Trying to execute the next instruction at a non-existing address
	 * should cause a machine check, resulting in reset
	 */
#ifdef CFG_RESET_ADDRESS
	addr = CFG_RESET_ADDRESS;
#else
	/*
	 * note: when CFG_MONITOR_BASE points to a RAM address, CFG_MONITOR_BASE
	 * - sizeof (ulong) is usually a valid address. Better pick an address
	 * known to be invalid on your system and assign it to CFG_RESET_ADDRESS.
	 * "(ulong)-1" used to be a good choice for many systems...
	 */
	addr = CFG_MONITOR_BASE - sizeof (ulong);
#endif
	((void (*)(void)) addr) ();
	return 1;
}

/* ------------------------------------------------------------------------- */

/*
 * Get timebase clock frequency (like cpu_clk in Hz)
 *
 * See sections 14.2 and 14.6 of the User's Manual
 */
unsigned long get_tbclk (void)
{
	DECLARE_GLOBAL_DATA_PTR;

	uint immr = get_immr (0);	/* Return full IMMR contents */
	volatile immap_t *immap = (volatile immap_t *)(immr & 0xFFFF0000);
	ulong oscclk, factor, pll;

	if (immap->im_clkrst.car_sccr & SCCR_TBS) {
		return (gd->cpu_clk / 16);
	}

	pll = immap->im_clkrst.car_plprcr;

#define PLPRCR_val(a) ((pll & PLPRCR_ ## a ## _MSK) >> PLPRCR_ ## a ## _SHIFT)

	/*
	 * For newer PQ1 chips (MPC866/87x/88x families), PLL multiplication
	 * factor is calculated as follows:
	 *
	 *		     MFN
	 *	     MFI + -------
	 *		   MFD + 1
	 * factor =  -----------------
	 *	     (PDF + 1) * 2^S
	 *
	 * For older chips, it's just MF field of PLPRCR plus one.
	 */
	if ((immr & 0x0FFF) >= MPC8xx_NEW_CLK) { /* MPC866/87x/88x series */
		factor = (PLPRCR_val(MFI) + PLPRCR_val(MFN)/(PLPRCR_val(MFD)+1))/
			(PLPRCR_val(PDF)+1) / (1<<PLPRCR_val(S));
	} else {
		factor = PLPRCR_val(MF)+1;
	}

	oscclk = gd->cpu_clk / factor;

	if ((immap->im_clkrst.car_sccr & SCCR_RTSEL) == 0 || factor > 2) {
		return (oscclk / 4);
	}
	return (oscclk / 16);
}

/* ------------------------------------------------------------------------- */

#if defined(CONFIG_WATCHDOG)
void watchdog_reset (void)
{
	int re_enable = disable_interrupts ();

	reset_8xx_watchdog ((immap_t *) CFG_IMMR);
	if (re_enable)
		enable_interrupts ();
}

void reset_8xx_watchdog (volatile immap_t * immr)
{
# if defined(CONFIG_LWMON)
	/*
	 * The LWMON board uses a MAX6301 Watchdog
	 * with the trigger pin connected to port PA.7
	 *
	 * (The old board version used a MAX706TESA Watchdog, which
	 * had to be handled exactly the same.)
	 */
# define WATCHDOG_BIT	0x0100
	immr->im_ioport.iop_papar &= ~(WATCHDOG_BIT);	/* GPIO     */
	immr->im_ioport.iop_padir |= WATCHDOG_BIT;	/* Output   */
	immr->im_ioport.iop_paodr &= ~(WATCHDOG_BIT);	/* active output */

	immr->im_ioport.iop_padat ^= WATCHDOG_BIT;	/* Toggle WDI   */
# elif defined(CONFIG_KUP4K) || defined(CONFIG_KUP4X)
	/*
	 * The KUP4 boards uses a TPS3705 Watchdog
	 * with the trigger pin connected to port PA.5
	 */
# define WATCHDOG_BIT	0x0400
	immr->im_ioport.iop_papar &= ~(WATCHDOG_BIT);	/* GPIO     */
	immr->im_ioport.iop_padir |= WATCHDOG_BIT;	/* Output   */
	immr->im_ioport.iop_paodr &= ~(WATCHDOG_BIT);	/* active output */

	immr->im_ioport.iop_padat ^= WATCHDOG_BIT;	/* Toggle WDI   */
# else
	/*
	 * All other boards use the MPC8xx Internal Watchdog
	 */
	immr->im_siu_conf.sc_swsr = 0x556c;	/* write magic1 */
	immr->im_siu_conf.sc_swsr = 0xaa39;	/* write magic2 */
# endif /* CONFIG_LWMON */
}

#endif /* CONFIG_WATCHDOG */

/* ------------------------------------------------------------------------- */