summaryrefslogtreecommitdiff
path: root/arch/arm/mach-mvebu/spl.c
blob: 50b24f5760b71bbea7ce76d43fed17568a2574ae (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
// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2014-2016 Stefan Roese <sr@denx.de>
 */

#include <common.h>
#include <dm.h>
#include <debug_uart.h>
#include <fdtdec.h>
#include <spl.h>
#include <asm/io.h>
#include <asm/arch/cpu.h>
#include <asm/arch/soc.h>

static u32 get_boot_device(void)
{
	u32 val;
	u32 boot_device;

	/*
	 * First check, if UART boot-mode is active. This can only
	 * be done, via the bootrom error register. Here the
	 * MSB marks if the UART mode is active.
	 */
	val = readl(CONFIG_BOOTROM_ERR_REG);
	boot_device = (val & BOOTROM_ERR_MODE_MASK) >> BOOTROM_ERR_MODE_OFFS;
	debug("BOOTROM_REG=0x%08x boot_device=0x%x\n", val, boot_device);
#if defined(CONFIG_ARMADA_38X)
	/*
	 * If the bootrom error register contains any else than zeros
	 * in the first 8 bits it's an error condition. And in that case
	 * try to boot from UART.
	 */
	if (boot_device)
#else
	if (boot_device == BOOTROM_ERR_MODE_UART)
#endif
		return BOOT_DEVICE_UART;

	/*
	 * Now check the SAR register for the strapped boot-device
	 */
	val = readl(CONFIG_SAR_REG);	/* SAR - Sample At Reset */
	boot_device = (val & BOOT_DEV_SEL_MASK) >> BOOT_DEV_SEL_OFFS;
	debug("SAR_REG=0x%08x boot_device=0x%x\n", val, boot_device);
	switch (boot_device) {
#if defined(CONFIG_ARMADA_38X)
	case BOOT_FROM_NAND:
		return BOOT_DEVICE_NAND;
#endif
#ifdef CONFIG_SPL_MMC_SUPPORT
	case BOOT_FROM_MMC:
	case BOOT_FROM_MMC_ALT:
		return BOOT_DEVICE_MMC1;
#endif
	case BOOT_FROM_UART:
#ifdef BOOT_FROM_UART_ALT
	case BOOT_FROM_UART_ALT:
#endif
		return BOOT_DEVICE_UART;
	case BOOT_FROM_SPI:
	default:
		return BOOT_DEVICE_SPI;
	};
}

u32 spl_boot_device(void)
{
	return get_boot_device();
}

void board_init_f(ulong dummy)
{
	int ret;

	/*
	 * Pin muxing needs to be done before UART output, since
	 * on A38x the UART pins need some re-muxing for output
	 * to work.
	 */
	board_early_init_f();

	/* Example code showing how to enable the debug UART on MVEBU */
#ifdef EARLY_UART
	/*
	 * Debug UART can be used from here if required:
	 *
	 * debug_uart_init();
	 * printch('a');
	 * printhex8(0x1234);
	 * printascii("string");
	 */
#endif

	ret = spl_init();
	if (ret) {
		debug("spl_init() failed: %d\n", ret);
		hang();
	}

	/* Use special translation offset for SPL */
	dm_set_translation_offset(0xd0000000 - 0xf1000000);

	preloader_console_init();

	timer_init();

	/* Armada 375 does not support SerDes and DDR3 init yet */
#if !defined(CONFIG_ARMADA_375)
	/* First init the serdes PHY's */
	serdes_phy_config();

	/* Setup DDR */
	ddr3_init();
#endif

	/*
	 * Return to the BootROM to continue the Marvell xmodem
	 * UART boot protocol. As initiated by the kwboot tool.
	 *
	 * This can only be done by the BootROM and not by the
	 * U-Boot SPL infrastructure, since the beginning of the
	 * image is already read and interpreted by the BootROM.
	 * SPL has no chance to receive this information. So we
	 * need to return to the BootROM to enable this xmodem
	 * UART download.
	 *
	 * If booting from NAND lets let the BootROM load the
	 * rest of the bootloader.
	 */
	switch (get_boot_device()) {
		case BOOT_DEVICE_UART:
#if defined(CONFIG_ARMADA_38X)
		case BOOT_DEVICE_NAND:
#endif
			return_to_bootrom();
	}
}