summaryrefslogtreecommitdiff
path: root/board/freescale/m54451evb/m54451evb.c
blob: 7cb840346c8a7e395bb5b693ab03b922bbf8760a (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
// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2000-2003
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * Copyright (C) 2004-2008, 2012 Freescale Semiconductor, Inc.
 * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
 */

#include <common.h>
#include <spi.h>
#include <asm/immap.h>
#include <asm/io.h>

DECLARE_GLOBAL_DATA_PTR;

int checkboard(void)
{
	/*
	 * need to to:
	 * Check serial flash size. if 2mb evb, else 8mb demo
	 */
	puts("Board: ");
	puts("Freescale M54451 EVB\n");
	return 0;
};

int dram_init(void)
{
	u32 dramsize;
#ifdef CONFIG_CF_SBF
	/*
	 * Serial Boot: The dram is already initialized in start.S
	 * only require to return DRAM size
	 */
	dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
#else
	sdramc_t *sdram = (sdramc_t *)(MMAP_SDRAM);
	gpio_t *gpio = (gpio_t *)(MMAP_GPIO);
	u32 i;

	dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;

	if ((in_be32(&sdram->sdcfg1) == CONFIG_SYS_SDRAM_CFG1) &&
	    (in_be32(&sdram->sdcfg2) == CONFIG_SYS_SDRAM_CFG2))
		return dramsize;

	for (i = 0x13; i < 0x20; i++) {
		if (dramsize == (1 << i))
			break;
	}
	i--;

	out_8(&gpio->mscr_sdram, CONFIG_SYS_SDRAM_DRV_STRENGTH);

	out_be32(&sdram->sdcs0, CONFIG_SYS_SDRAM_BASE | i);

	out_be32(&sdram->sdcfg1, CONFIG_SYS_SDRAM_CFG1);
	out_be32(&sdram->sdcfg2, CONFIG_SYS_SDRAM_CFG2);

	udelay(200);

	/* Issue PALL */
	out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 2);
	__asm__("nop");

	/* Perform two refresh cycles */
	out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
	__asm__("nop");
	out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
	__asm__("nop");

	/* Issue LEMR */
	out_be32(&sdram->sdmr, CONFIG_SYS_SDRAM_MODE);
	__asm__("nop");
	out_be32(&sdram->sdmr, CONFIG_SYS_SDRAM_MODE);
	__asm__("nop");

	out_be32(&sdram->sdcr,
		(CONFIG_SYS_SDRAM_CTRL & ~0x80000000) | 0x10000000);

	udelay(100);
#endif
	gd->ram_size = dramsize;

	return 0;
};

int testdram(void)
{
	/* TODO: XXX XXX XXX */
	printf("DRAM test not implemented!\n");

	return (0);
}