summaryrefslogtreecommitdiff
path: root/board/freescale/common/pixis.c
blob: e9b71278333be8df61d2ffda606cdb8f840723c1 (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
// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright 2006,2010 Freescale Semiconductor
 * Jeff Brown
 * Srikanth Srinivasan (srikanth.srinivasan@freescale.com)
 */

#include <common.h>
#include <command.h>
#include <asm/io.h>

#define pixis_base (u8 *)PIXIS_BASE

/*
 * Simple board reset.
 */
void pixis_reset(void)
{
	out_8(pixis_base + PIXIS_RST, 0);

	while (1);
}

/*
 * Per table 27, page 58 of MPC8641HPCN spec.
 */
static int set_px_sysclk(unsigned long sysclk)
{
	u8 sysclk_s, sysclk_r, sysclk_v, vclkh, vclkl, sysclk_aux;

	switch (sysclk) {
	case 33:
		sysclk_s = 0x04;
		sysclk_r = 0x04;
		sysclk_v = 0x07;
		sysclk_aux = 0x00;
		break;
	case 40:
		sysclk_s = 0x01;
		sysclk_r = 0x1F;
		sysclk_v = 0x20;
		sysclk_aux = 0x01;
		break;
	case 50:
		sysclk_s = 0x01;
		sysclk_r = 0x1F;
		sysclk_v = 0x2A;
		sysclk_aux = 0x02;
		break;
	case 66:
		sysclk_s = 0x01;
		sysclk_r = 0x04;
		sysclk_v = 0x04;
		sysclk_aux = 0x03;
		break;
	case 83:
		sysclk_s = 0x01;
		sysclk_r = 0x1F;
		sysclk_v = 0x4B;
		sysclk_aux = 0x04;
		break;
	case 100:
		sysclk_s = 0x01;
		sysclk_r = 0x1F;
		sysclk_v = 0x5C;
		sysclk_aux = 0x05;
		break;
	case 134:
		sysclk_s = 0x06;
		sysclk_r = 0x1F;
		sysclk_v = 0x3B;
		sysclk_aux = 0x06;
		break;
	case 166:
		sysclk_s = 0x06;
		sysclk_r = 0x1F;
		sysclk_v = 0x4B;
		sysclk_aux = 0x07;
		break;
	default:
		printf("Unsupported SYSCLK frequency.\n");
		return 0;
	}

	vclkh = (sysclk_s << 5) | sysclk_r;
	vclkl = sysclk_v;

	out_8(pixis_base + PIXIS_VCLKH, vclkh);
	out_8(pixis_base + PIXIS_VCLKL, vclkl);

	out_8(pixis_base + PIXIS_AUX, sysclk_aux);

	return 1;
}

/* Set the CFG_SYSPLL bits
 *
 * This only has effect if PX_VCFGEN0[SYSPLL]=1, which is true if
 * read_from_px_regs() is called.
 */
static int set_px_mpxpll(unsigned long mpxpll)
{
	switch (mpxpll) {
	case 2:
	case 4:
	case 6:
	case 8:
	case 10:
	case 12:
	case 14:
	case 16:
		clrsetbits_8(pixis_base + PIXIS_VSPEED1, 0x1F, mpxpll);
		return 1;
	}

	printf("Unsupported MPXPLL ratio.\n");
	return 0;
}

static int set_px_corepll(unsigned long corepll)
{
	u8 val;

	switch (corepll) {
	case 20:
		val = 0x08;
		break;
	case 25:
		val = 0x0C;
		break;
	case 30:
		val = 0x10;
		break;
	case 35:
		val = 0x1C;
		break;
	case 40:
		val = 0x14;
		break;
	case 45:
		val = 0x0E;
		break;
	default:
		printf("Unsupported COREPLL ratio.\n");
		return 0;
	}

	clrsetbits_8(pixis_base + PIXIS_VSPEED0, 0x1F, val);
	return 1;
}

#ifndef CONFIG_SYS_PIXIS_VCFGEN0_ENABLE
#define CONFIG_SYS_PIXIS_VCFGEN0_ENABLE		0x1C
#endif

/* Tell the PIXIS where to find the COREPLL, MPXPLL, SYSCLK values
 *
 * The PIXIS can be programmed to look at either the on-board dip switches
 * or various other PIXIS registers to determine the values for COREPLL,
 * MPXPLL, and SYSCLK.
 *
 * CONFIG_SYS_PIXIS_VCFGEN0_ENABLE is the value to write to the PIXIS_VCFGEN0
 * register that tells the pixis to use the various PIXIS register.
 */
static void read_from_px_regs(int set)
{
	u8 tmp = in_8(pixis_base + PIXIS_VCFGEN0);

	if (set)
		tmp = tmp | CONFIG_SYS_PIXIS_VCFGEN0_ENABLE;
	else
		tmp = tmp & ~CONFIG_SYS_PIXIS_VCFGEN0_ENABLE;

	out_8(pixis_base + PIXIS_VCFGEN0, tmp);
}

/* CONFIG_SYS_PIXIS_VBOOT_ENABLE is the value to write to the PX_VCFGEN1
 * register that tells the pixis to use the PX_VBOOT[LBMAP] register.
 */
#ifndef CONFIG_SYS_PIXIS_VBOOT_ENABLE
#define CONFIG_SYS_PIXIS_VBOOT_ENABLE	0x04
#endif

/* Configure the source of the boot location
 *
 * The PIXIS can be programmed to look at either the on-board dip switches
 * or the PX_VBOOT[LBMAP] register to determine where we should boot.
 *
 * If we want to boot from the alternate boot bank, we need to tell the PIXIS
 * to ignore the on-board dip switches and use the PX_VBOOT[LBMAP] instead.
 */
static void read_from_px_regs_altbank(int set)
{
	u8 tmp = in_8(pixis_base + PIXIS_VCFGEN1);

	if (set)
		tmp = tmp | CONFIG_SYS_PIXIS_VBOOT_ENABLE;
	else
		tmp = tmp & ~CONFIG_SYS_PIXIS_VBOOT_ENABLE;

	out_8(pixis_base + PIXIS_VCFGEN1, tmp);
}

/* CONFIG_SYS_PIXIS_VBOOT_MASK contains the bits to set in VBOOT register that
 * tells the PIXIS what the alternate flash bank is.
 *
 * Note that it's not really a mask.  It contains the actual LBMAP bits that
 * must be set to select the alternate bank.  This code assumes that the
 * primary bank has these bits set to 0, and the alternate bank has these
 * bits set to 1.
 */
#ifndef CONFIG_SYS_PIXIS_VBOOT_MASK
#define CONFIG_SYS_PIXIS_VBOOT_MASK	(0x40)
#endif

/* Tell the PIXIS to boot from the default flash bank
 *
 * Program the default flash bank into the VBOOT register.  This register is
 * used only if PX_VCFGEN1[FLASH]=1.
 */
static void clear_altbank(void)
{
	clrbits_8(pixis_base + PIXIS_VBOOT, CONFIG_SYS_PIXIS_VBOOT_MASK);
}

/* Tell the PIXIS to boot from the alternate flash bank
 *
 * Program the alternate flash bank into the VBOOT register.  This register is
 * used only if PX_VCFGEN1[FLASH]=1.
 */
static void set_altbank(void)
{
	setbits_8(pixis_base + PIXIS_VBOOT, CONFIG_SYS_PIXIS_VBOOT_MASK);
}

/* Reset the board with watchdog disabled.
 *
 * This respects the altbank setting.
 */
static void set_px_go(void)
{
	/* Disable the VELA sequencer and watchdog */
	clrbits_8(pixis_base + PIXIS_VCTL, 9);

	/* Reboot by starting the VELA sequencer */
	setbits_8(pixis_base + PIXIS_VCTL, 0x1);

	while (1);
}

/* Reset the board with watchdog enabled.
 *
 * This respects the altbank setting.
 */
static void set_px_go_with_watchdog(void)
{
	/* Disable the VELA sequencer */
	clrbits_8(pixis_base + PIXIS_VCTL, 1);

	/* Enable the watchdog and reboot by starting the VELA sequencer */
	setbits_8(pixis_base + PIXIS_VCTL, 0x9);

	while (1);
}

/* Disable the watchdog
 *
 */
static int pixis_disable_watchdog_cmd(cmd_tbl_t *cmdtp, int flag, int argc,
				      char * const argv[])
{
	/* Disable the VELA sequencer and the watchdog */
	clrbits_8(pixis_base + PIXIS_VCTL, 9);

	return 0;
}

U_BOOT_CMD(
	diswd, 1, 0, pixis_disable_watchdog_cmd,
	"Disable watchdog timer",
	""
);

#ifdef CONFIG_PIXIS_SGMII_CMD

/* Enable or disable SGMII mode for a TSEC
 */
static int pixis_set_sgmii(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	int which_tsec = -1;
	unsigned char mask;
	unsigned char switch_mask;

	if ((argc > 2) && (strcmp(argv[1], "all") != 0))
		which_tsec = simple_strtoul(argv[1], NULL, 0);

	switch (which_tsec) {
#ifdef CONFIG_TSEC1
	case 1:
		mask = PIXIS_VSPEED2_TSEC1SER;
		switch_mask = PIXIS_VCFGEN1_TSEC1SER;
		break;
#endif
#ifdef CONFIG_TSEC2
	case 2:
		mask = PIXIS_VSPEED2_TSEC2SER;
		switch_mask = PIXIS_VCFGEN1_TSEC2SER;
		break;
#endif
#ifdef CONFIG_TSEC3
	case 3:
		mask = PIXIS_VSPEED2_TSEC3SER;
		switch_mask = PIXIS_VCFGEN1_TSEC3SER;
		break;
#endif
#ifdef CONFIG_TSEC4
	case 4:
		mask = PIXIS_VSPEED2_TSEC4SER;
		switch_mask = PIXIS_VCFGEN1_TSEC4SER;
		break;
#endif
	default:
		mask = PIXIS_VSPEED2_MASK;
		switch_mask = PIXIS_VCFGEN1_MASK;
		break;
	}

	/* Toggle whether the switches or FPGA control the settings */
	if (!strcmp(argv[argc - 1], "switch"))
		clrbits_8(pixis_base + PIXIS_VCFGEN1, switch_mask);
	else
		setbits_8(pixis_base + PIXIS_VCFGEN1, switch_mask);

	/* If it's not the switches, enable or disable SGMII, as specified */
	if (!strcmp(argv[argc - 1], "on"))
		clrbits_8(pixis_base + PIXIS_VSPEED2, mask);
	else if (!strcmp(argv[argc - 1], "off"))
		setbits_8(pixis_base + PIXIS_VSPEED2, mask);

	return 0;
}

U_BOOT_CMD(
	pixis_set_sgmii, CONFIG_SYS_MAXARGS, 1, pixis_set_sgmii,
	"pixis_set_sgmii"
	" - Enable or disable SGMII mode for a given TSEC \n",
	"\npixis_set_sgmii [TSEC num] <on|off|switch>\n"
	"    TSEC num: 1,2,3,4 or 'all'.  'all' is default.\n"
	"    on - enables SGMII\n"
	"    off - disables SGMII\n"
	"    switch - use switch settings"
);

#endif

/*
 * This function takes the non-integral cpu:mpx pll ratio
 * and converts it to an integer that can be used to assign
 * FPGA register values.
 * input: strptr i.e. argv[2]
 */
static unsigned long strfractoint(char *strptr)
{
	int i, j;
	int mulconst;
	int no_dec = 0;
	unsigned long intval = 0, decval = 0;
	char intarr[3], decarr[3];

	/* Assign the integer part to intarr[]
	 * If there is no decimal point i.e.
	 * if the ratio is an integral value
	 * simply create the intarr.
	 */
	i = 0;
	while (strptr[i] != '.') {
		if (strptr[i] == 0) {
			no_dec = 1;
			break;
		}
		intarr[i] = strptr[i];
		i++;
	}

	intarr[i] = '\0';

	if (no_dec) {
		/* Currently needed only for single digit corepll ratios */
		mulconst = 10;
		decval = 0;
	} else {
		j = 0;
		i++;		/* Skipping the decimal point */
		while ((strptr[i] >= '0') && (strptr[i] <= '9')) {
			decarr[j] = strptr[i];
			i++;
			j++;
		}

		decarr[j] = '\0';

		mulconst = 1;
		for (i = 0; i < j; i++)
			mulconst *= 10;
		decval = simple_strtoul(decarr, NULL, 10);
	}

	intval = simple_strtoul(intarr, NULL, 10);
	intval = intval * mulconst;

	return intval + decval;
}

static int pixis_reset_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	unsigned int i;
	char *p_cf = NULL;
	char *p_cf_sysclk = NULL;
	char *p_cf_corepll = NULL;
	char *p_cf_mpxpll = NULL;
	char *p_altbank = NULL;
	char *p_wd = NULL;
	int unknown_param = 0;

	/*
	 * No args is a simple reset request.
	 */
	if (argc <= 1) {
		pixis_reset();
		/* not reached */
	}

	for (i = 1; i < argc; i++) {
		if (strcmp(argv[i], "cf") == 0) {
			p_cf = argv[i];
			if (i + 3 >= argc) {
				break;
			}
			p_cf_sysclk = argv[i+1];
			p_cf_corepll = argv[i+2];
			p_cf_mpxpll = argv[i+3];
			i += 3;
			continue;
		}

		if (strcmp(argv[i], "altbank") == 0) {
			p_altbank = argv[i];
			continue;
		}

		if (strcmp(argv[i], "wd") == 0) {
			p_wd = argv[i];
			continue;
		}

		unknown_param = 1;
	}

	/*
	 * Check that cf has all required parms
	 */
	if ((p_cf && !(p_cf_sysclk && p_cf_corepll && p_cf_mpxpll))
	    ||	unknown_param) {
#ifdef CONFIG_SYS_LONGHELP
		puts(cmdtp->help);
		putc('\n');
#endif
		return 1;
	}

	/*
	 * PIXIS seems to be sensitive to the ordering of
	 * the registers that are touched.
	 */
	read_from_px_regs(0);

	if (p_altbank)
		read_from_px_regs_altbank(0);

	clear_altbank();

	/*
	 * Clock configuration specified.
	 */
	if (p_cf) {
		unsigned long sysclk;
		unsigned long corepll;
		unsigned long mpxpll;

		sysclk = simple_strtoul(p_cf_sysclk, NULL, 10);
		corepll = strfractoint(p_cf_corepll);
		mpxpll = simple_strtoul(p_cf_mpxpll, NULL, 10);

		if (!(set_px_sysclk(sysclk)
		      && set_px_corepll(corepll)
		      && set_px_mpxpll(mpxpll))) {
#ifdef CONFIG_SYS_LONGHELP
			puts(cmdtp->help);
			putc('\n');
#endif
			return 1;
		}
		read_from_px_regs(1);
	}

	/*
	 * Altbank specified
	 *
	 * NOTE CHANGE IN BEHAVIOR: previous code would default
	 * to enabling watchdog if altbank is specified.
	 * Now the watchdog must be enabled explicitly using 'wd'.
	 */
	if (p_altbank) {
		set_altbank();
		read_from_px_regs_altbank(1);
	}

	/*
	 * Reset with watchdog specified.
	 */
	if (p_wd)
		set_px_go_with_watchdog();
	else
		set_px_go();

	/*
	 * Shouldn't be reached.
	 */
	return 0;
}


U_BOOT_CMD(
	pixis_reset, CONFIG_SYS_MAXARGS, 1, pixis_reset_cmd,
	"Reset the board using the FPGA sequencer",
	"    pixis_reset\n"
	"    pixis_reset [altbank]\n"
	"    pixis_reset altbank wd\n"
	"    pixis_reset altbank cf <SYSCLK freq> <COREPLL ratio> <MPXPLL ratio>\n"
	"    pixis_reset cf <SYSCLK freq> <COREPLL ratio> <MPXPLL ratio>"
);