summaryrefslogtreecommitdiff
path: root/arch/x86/lib/board.c
blob: b64c2d3ca385ba0db8c27ff72b517578bb2b8ddf (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
/*
 * (C) Copyright 2008-2011
 * Graeme Russ, <graeme.russ@gmail.com>
 *
 * (C) Copyright 2002
 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
 *
 * (C) Copyright 2002
 * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Marius Groeger <mgroeger@sysgo.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
 */

#include <common.h>
#include <watchdog.h>
#include <command.h>
#include <stdio_dev.h>
#include <version.h>
#include <malloc.h>
#include <net.h>
#include <ide.h>
#include <serial.h>
#include <asm/u-boot-x86.h>
#include <elf.h>
#include <asm/processor.h>

#ifdef CONFIG_BITBANGMII
#include <miiphy.h>
#endif

/************************************************************************
 * Init Utilities							*
 ************************************************************************
 * Some of this code should be moved into the core functions,
 * or dropped completely,
 * but let's get it working (again) first...
 */
static int init_baudrate(void)
{
	gd->baudrate = getenv_ulong("baudrate", 10, CONFIG_BAUDRATE);
	return 0;
}

static int display_banner(void)
{

	printf("\n\n%s\n\n", version_string);

	return 0;
}

static int display_dram_config(void)
{
	int i;

	puts("DRAM Configuration:\n");

	for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
		printf("Bank #%d: %08lx ", i, gd->bd->bi_dram[i].start);
		print_size(gd->bd->bi_dram[i].size, "\n");
	}

	return 0;
}

#ifndef CONFIG_SYS_NO_FLASH
static void display_flash_config(ulong size)
{
	puts("Flash: ");
	print_size(size, "\n");
}
#endif

/*
 * Breath some life into the board...
 *
 * Initialize an SMC for serial comms, and carry out some hardware
 * tests.
 *
 * The first part of initialization is running from Flash memory;
 * its main purpose is to initialize the RAM so that we
 * can relocate the monitor code to RAM.
 */

/*
 * All attempts to come up with a "common" initialization sequence
 * that works for all boards and architectures failed: some of the
 * requirements are just _too_ different. To get rid of the resulting
 * mess of board dependend #ifdef'ed code we now make the whole
 * initialization sequence configurable to the user.
 *
 * The requirements for any new initalization function is simple: it
 * receives a pointer to the "global data" structure as it's only
 * argument, and returns an integer return code, where 0 means
 * "continue" and != 0 means "fatal error, hang the system".
 */
typedef int (init_fnc_t) (void);

static int calculate_relocation_address(void);
static int copy_uboot_to_ram(void);
static int clear_bss(void);
static int do_elf_reloc_fixups(void);
static int copy_gd_to_ram(void);

init_fnc_t *init_sequence_f[] = {
	cpu_init_f,
	board_early_init_f,
	env_init,
	init_baudrate,
	serial_init,
	console_init_f,
	dram_init_f,
	calculate_relocation_address,
	copy_uboot_to_ram,
	clear_bss,
	do_elf_reloc_fixups,

	NULL,
};

init_fnc_t *init_sequence_r[] = {
	copy_gd_to_ram,
	cpu_init_r,		/* basic cpu dependent setup */
	board_early_init_r,	/* basic board dependent setup */
	dram_init,		/* configure available RAM banks */
	interrupt_init,		/* set up exceptions */
	timer_init,
	display_banner,
	display_dram_config,

	NULL,
};

static int calculate_relocation_address(void)
{
	ulong text_start = (ulong)&__text_start;
	ulong bss_end = (ulong)&__bss_end;
	ulong dest_addr;

	/*
	 * NOTE: All destination address are rounded down to 16-byte
	 *       boundary to satisfy various worst-case alignment
	 *       requirements
	 */

	/* Global Data is at top of available memory */
	dest_addr = gd->ram_size;
	dest_addr -= GENERATED_GBL_DATA_SIZE;
	dest_addr &= ~15;
	gd->new_gd_addr = dest_addr;

	/* GDT is below Global Data */
	dest_addr -= X86_GDT_SIZE;
	dest_addr &= ~15;
	gd->gdt_addr = dest_addr;

	/* Stack is below GDT */
	gd->start_addr_sp = dest_addr;

	/* U-Boot is below the stack */
	dest_addr -= CONFIG_SYS_STACK_SIZE;
	dest_addr -= (bss_end - text_start);
	dest_addr &= ~15;
	gd->relocaddr = dest_addr;
	gd->reloc_off = (dest_addr - text_start);

	return 0;
}

static int copy_uboot_to_ram(void)
{
	size_t len = (size_t)&__data_end - (size_t)&__text_start;

	memcpy((void *)gd->relocaddr, (void *)&__text_start, len);

	return 0;
}

static int clear_bss(void)
{
	ulong dst_addr = (ulong)&__bss_start + gd->reloc_off;
	size_t len = (size_t)&__bss_end - (size_t)&__bss_start;

	memset((void *)dst_addr, 0x00, len);

	return 0;
}

static int do_elf_reloc_fixups(void)
{
	Elf32_Rel *re_src = (Elf32_Rel *)(&__rel_dyn_start);
	Elf32_Rel *re_end = (Elf32_Rel *)(&__rel_dyn_end);

	Elf32_Addr *offset_ptr_rom;
	Elf32_Addr *offset_ptr_ram;

	/* The size of the region of u-boot that runs out of RAM. */
	uintptr_t size = (uintptr_t)&__bss_end - (uintptr_t)&__text_start;

	do {
		/* Get the location from the relocation entry */
		offset_ptr_rom = (Elf32_Addr *)re_src->r_offset;

		/* Check that the location of the relocation is in .text */
		if (offset_ptr_rom >= (Elf32_Addr *)CONFIG_SYS_TEXT_BASE) {

			/* Switch to the in-RAM version */
			offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
							gd->reloc_off);

			/* Check that the target points into .text */
			if (*offset_ptr_ram >= CONFIG_SYS_TEXT_BASE &&
					*offset_ptr_ram <
					(CONFIG_SYS_TEXT_BASE + size)) {
				*offset_ptr_ram += gd->reloc_off;
			}
		}
	} while (re_src++ < re_end);

	return 0;
}

/* Load U-Boot into RAM, initialize BSS, perform relocation adjustments */
void board_init_f(ulong boot_flags)
{
	init_fnc_t **init_fnc_ptr;

	gd->flags = boot_flags;

	for (init_fnc_ptr = init_sequence_f; *init_fnc_ptr; ++init_fnc_ptr) {
		if ((*init_fnc_ptr)() != 0)
			hang();
	}

	gd->flags |= GD_FLG_RELOC;

	/*
	 * SDRAM is now initialised, U-Boot has been copied into SDRAM,
	 * the BSS has been cleared etc. The final stack can now be setup
	 * in SDRAM. Code execution will continue (momentarily) in Flash,
	 * but with the stack in SDRAM and Global Data in temporary memory
	 * (CPU cache)
	 */
	board_init_f_r_trampoline(gd->start_addr_sp);

	/* NOTREACHED - board_init_f_r_trampoline() does not return */
	while (1)
		;
}

void board_init_f_r(void)
{
	/*
	 * Transfer execution from Flash to RAM by calculating the address
	 * of the in-RAM copy of board_init_r() and calling it
	 */
	(board_init_r + gd->reloc_off)(gd, gd->relocaddr);

	/* NOTREACHED - board_init_r() does not return */
	while (1)
		;
}

static int copy_gd_to_ram(void)
{
	gd_t *ram_gd;

	/*
	 * Global data is still in temporary memory (the CPU cache).
	 * calculate_relocation_address() has set gd->new_gd_addr to
	 * where the global data lives in RAM but getting it there
	 * safely is a bit tricky due to the 'F-Segment Hack' that
	 * we need to use for x86
	 */
	ram_gd = (gd_t *)gd->new_gd_addr;
	memcpy((void *)ram_gd, gd, sizeof(gd_t));

	/*
	 * Reload the Global Descriptor Table so FS points to the
	 * in-RAM copy of Global Data (calculate_relocation_address()
	 * has already calculated the in-RAM location of the GDT)
	 */
	ram_gd->gd_addr = (ulong)ram_gd;
	init_gd(ram_gd, (u64 *)gd->gdt_addr);

	return 0;
}

void board_init_r(gd_t *id, ulong dest_addr)
{
#if defined(CONFIG_CMD_NET)
	char *s;
#endif
#ifndef CONFIG_SYS_NO_FLASH
	ulong size;
#endif
	static bd_t bd_data;
	init_fnc_t **init_fnc_ptr;

	show_boot_progress(0x21);

	/* compiler optimization barrier needed for GCC >= 3.4 */
	__asm__ __volatile__("" : : : "memory");

	gd->bd = &bd_data;
	memset(gd->bd, 0, sizeof(bd_t));
	show_boot_progress(0x22);

	gd->baudrate =  CONFIG_BAUDRATE;

	mem_malloc_init((((ulong)dest_addr - CONFIG_SYS_MALLOC_LEN)+3)&~3,
			CONFIG_SYS_MALLOC_LEN);

	for (init_fnc_ptr = init_sequence_r; *init_fnc_ptr; ++init_fnc_ptr) {
		if ((*init_fnc_ptr)() != 0)
			hang();
	}
	show_boot_progress(0x23);

#ifdef CONFIG_SERIAL_MULTI
	serial_initialize();
#endif

#ifndef CONFIG_SYS_NO_FLASH
	/* configure available FLASH banks */
	size = flash_init();
	display_flash_config(size);
	show_boot_progress(0x24);
#endif

	show_boot_progress(0x25);

	/* initialize environment */
	env_relocate();
	show_boot_progress(0x26);


#ifdef CONFIG_CMD_NET
	/* IP Address */
	bd_data.bi_ip_addr = getenv_IPaddr("ipaddr");
#endif

#if defined(CONFIG_PCI)
	/*
	 * Do pci configuration
	 */
	pci_init();
#endif

	show_boot_progress(0x27);


	stdio_init();

	jumptable_init();

	/* Initialize the console (after the relocation and devices init) */
	console_init_r();

#ifdef CONFIG_MISC_INIT_R
	/* miscellaneous platform dependent initialisations */
	misc_init_r();
#endif

#if defined(CONFIG_CMD_PCMCIA) && !defined(CONFIG_CMD_IDE)
	WATCHDOG_RESET();
	puts("PCMCIA:");
	pcmcia_init();
#endif

#if defined(CONFIG_CMD_KGDB)
	WATCHDOG_RESET();
	puts("KGDB:  ");
	kgdb_init();
#endif

	/* enable exceptions */
	enable_interrupts();
	show_boot_progress(0x28);

#ifdef CONFIG_STATUS_LED
	status_led_set(STATUS_LED_BOOT, STATUS_LED_BLINKING);
#endif

	udelay(20);

	/* Initialize from environment */
	load_addr = getenv_ulong("loadaddr", 16, load_addr);
#if defined(CONFIG_CMD_NET)
	s = getenv("bootfile");

	if (s != NULL)
		copy_filename(BootFile, s, sizeof(BootFile));
#endif

	WATCHDOG_RESET();

#if defined(CONFIG_CMD_IDE)
	WATCHDOG_RESET();
	puts("IDE:   ");
	ide_init();
#endif

#if defined(CONFIG_CMD_SCSI)
	WATCHDOG_RESET();
	puts("SCSI:  ");
	scsi_init();
#endif

#if defined(CONFIG_CMD_DOC)
	WATCHDOG_RESET();
	puts("DOC:   ");
	doc_init();
#endif

#ifdef CONFIG_BITBANGMII
	bb_miiphy_init();
#endif
#if defined(CONFIG_CMD_NET)
	WATCHDOG_RESET();
	puts("Net:   ");
	eth_initialize(gd->bd);
#endif

#if (defined(CONFIG_CMD_NET)) && (0)
	WATCHDOG_RESET();
# ifdef DEBUG
	puts("Reset Ethernet PHY\n");
# endif
	reset_phy();
#endif

#ifdef CONFIG_LAST_STAGE_INIT
	WATCHDOG_RESET();
	/*
	 * Some parts can be only initialized if all others (like
	 * Interrupts) are up and running (i.e. the PC-style ISA
	 * keyboard).
	 */
	last_stage_init();
#endif


#ifdef CONFIG_POST
	post_run(NULL, POST_RAM | post_bootmode_get(0));
#endif

	show_boot_progress(0x29);

	/* main_loop() can return to retry autoboot, if so just run it again. */
	for (;;)
		main_loop();

	/* NOTREACHED - no way out of command loop except booting */
}

void hang(void)
{
	puts("### ERROR ### Please RESET the board ###\n");
	for (;;)
		;
}

unsigned long do_go_exec(ulong (*entry)(int, char * const []),
			 int argc, char * const argv[])
{
	unsigned long ret = 0;
	char **argv_tmp;

	/*
	 * x86 does not use a dedicated register to pass the pointer to
	 * the global_data, so it is instead passed as argv[-1]. By using
	 * argv[-1], the called 'Application' can use the contents of
	 * argv natively. However, to safely use argv[-1] a new copy of
	 * argv is needed with the extra element
	 */
	argv_tmp = malloc(sizeof(char *) * (argc + 1));

	if (argv_tmp) {
		argv_tmp[0] = (char *)gd;

		memcpy(&argv_tmp[1], argv, (size_t)(sizeof(char *) * argc));

		ret = (entry) (argc, &argv_tmp[1]);
		free(argv_tmp);
	}

	return ret;
}

void setup_pcat_compatibility(void)
	__attribute__((weak, alias("__setup_pcat_compatibility")));

void __setup_pcat_compatibility(void)
{
}