1 /*
2  * Freescale i.MX28 Boot setup
3  *
4  * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
5  * on behalf of DENX Software Engineering GmbH
6  *
7  * SPDX-License-Identifier:	GPL-2.0+
8  */
9 
10 #include <common.h>
11 #include <config.h>
12 #include <asm/io.h>
13 #include <asm/arch/imx-regs.h>
14 #include <asm/arch/sys_proto.h>
15 #include <asm/gpio.h>
16 #include <linux/compiler.h>
17 
18 #include "mxs_init.h"
19 
20 DECLARE_GLOBAL_DATA_PTR;
21 static gd_t gdata __section(".data");
22 #ifdef CONFIG_SPL_SERIAL_SUPPORT
23 static bd_t bdata __section(".data");
24 #endif
25 
26 /*
27  * This delay function is intended to be used only in early stage of boot, where
28  * clock are not set up yet. The timer used here is reset on every boot and
29  * takes a few seconds to roll. The boot doesn't take that long, so to keep the
30  * code simple, it doesn't take rolling into consideration.
31  */
32 void early_delay(int delay)
33 {
34 	struct mxs_digctl_regs *digctl_regs =
35 		(struct mxs_digctl_regs *)MXS_DIGCTL_BASE;
36 
37 	uint32_t st = readl(&digctl_regs->hw_digctl_microseconds);
38 	st += delay;
39 	while (st > readl(&digctl_regs->hw_digctl_microseconds))
40 		;
41 }
42 
43 #define	MUX_CONFIG_BOOTMODE_PAD	(MXS_PAD_3V3 | MXS_PAD_4MA | MXS_PAD_NOPULL)
44 static const iomux_cfg_t iomux_boot[] = {
45 #if defined(CONFIG_MX23)
46 	MX23_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD,
47 	MX23_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD,
48 	MX23_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD,
49 	MX23_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD,
50 	MX23_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD,
51 	MX23_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD,
52 #elif defined(CONFIG_MX28)
53 	MX28_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD,
54 	MX28_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD,
55 	MX28_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD,
56 	MX28_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD,
57 	MX28_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD,
58 	MX28_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD,
59 #endif
60 };
61 
62 static uint8_t mxs_get_bootmode_index(void)
63 {
64 	uint8_t bootmode = 0;
65 	int i;
66 	uint8_t masked;
67 
68 	/* Setup IOMUX of bootmode pads to GPIO */
69 	mxs_iomux_setup_multiple_pads(iomux_boot, ARRAY_SIZE(iomux_boot));
70 
71 #if defined(CONFIG_MX23)
72 	/* Setup bootmode pins as GPIO input */
73 	gpio_direction_input(MX23_PAD_LCD_D00__GPIO_1_0);
74 	gpio_direction_input(MX23_PAD_LCD_D01__GPIO_1_1);
75 	gpio_direction_input(MX23_PAD_LCD_D02__GPIO_1_2);
76 	gpio_direction_input(MX23_PAD_LCD_D03__GPIO_1_3);
77 	gpio_direction_input(MX23_PAD_LCD_D05__GPIO_1_5);
78 
79 	/* Read bootmode pads */
80 	bootmode |= (gpio_get_value(MX23_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0;
81 	bootmode |= (gpio_get_value(MX23_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1;
82 	bootmode |= (gpio_get_value(MX23_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2;
83 	bootmode |= (gpio_get_value(MX23_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3;
84 	bootmode |= (gpio_get_value(MX23_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5;
85 #elif defined(CONFIG_MX28)
86 	/* Setup bootmode pins as GPIO input */
87 	gpio_direction_input(MX28_PAD_LCD_D00__GPIO_1_0);
88 	gpio_direction_input(MX28_PAD_LCD_D01__GPIO_1_1);
89 	gpio_direction_input(MX28_PAD_LCD_D02__GPIO_1_2);
90 	gpio_direction_input(MX28_PAD_LCD_D03__GPIO_1_3);
91 	gpio_direction_input(MX28_PAD_LCD_D04__GPIO_1_4);
92 	gpio_direction_input(MX28_PAD_LCD_D05__GPIO_1_5);
93 
94 	/* Read bootmode pads */
95 	bootmode |= (gpio_get_value(MX28_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0;
96 	bootmode |= (gpio_get_value(MX28_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1;
97 	bootmode |= (gpio_get_value(MX28_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2;
98 	bootmode |= (gpio_get_value(MX28_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3;
99 	bootmode |= (gpio_get_value(MX28_PAD_LCD_D04__GPIO_1_4) ? 1 : 0) << 4;
100 	bootmode |= (gpio_get_value(MX28_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5;
101 #endif
102 
103 	for (i = 0; i < ARRAY_SIZE(mxs_boot_modes); i++) {
104 		masked = bootmode & mxs_boot_modes[i].boot_mask;
105 		if (masked == mxs_boot_modes[i].boot_pads)
106 			break;
107 	}
108 
109 	return i;
110 }
111 
112 static void mxs_spl_fixup_vectors(void)
113 {
114 	/*
115 	 * Copy our vector table to 0x0, since due to HAB, we cannot
116 	 * be loaded to 0x0. We want to have working vectoring though,
117 	 * thus this fixup. Our vectoring table is PIC, so copying is
118 	 * fine.
119 	 */
120 	extern uint32_t _start;
121 
122 	/* cppcheck-suppress nullPointer */
123 	memcpy(0x0, &_start, 0x60);
124 }
125 
126 static void mxs_spl_console_init(void)
127 {
128 #ifdef CONFIG_SPL_SERIAL_SUPPORT
129 	gd->bd = &bdata;
130 	gd->baudrate = CONFIG_BAUDRATE;
131 	serial_init();
132 	gd->have_console = 1;
133 #endif
134 }
135 
136 void mxs_common_spl_init(const uint32_t arg, const uint32_t *resptr,
137 			 const iomux_cfg_t *iomux_setup,
138 			 const unsigned int iomux_size)
139 {
140 	struct mxs_spl_data *data = (struct mxs_spl_data *)
141 		((CONFIG_SYS_TEXT_BASE - sizeof(struct mxs_spl_data)) & ~0xf);
142 	uint8_t bootmode = mxs_get_bootmode_index();
143 	gd = &gdata;
144 
145 	mxs_spl_fixup_vectors();
146 
147 	mxs_iomux_setup_multiple_pads(iomux_setup, iomux_size);
148 
149 	mxs_spl_console_init();
150 
151 	mxs_power_init();
152 
153 	mxs_mem_init();
154 	data->mem_dram_size = mxs_mem_get_size();
155 
156 	data->boot_mode_idx = bootmode;
157 
158 	mxs_power_wait_pswitch();
159 }
160 
161 /* Support aparatus */
162 inline void board_init_f(unsigned long bootflag)
163 {
164 	for (;;)
165 		;
166 }
167 
168 inline void board_init_r(gd_t *id, ulong dest_addr)
169 {
170 	for (;;)
171 		;
172 }
173