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 #endif
53 };
54 
55 static uint8_t mxs_get_bootmode_index(void)
56 {
57 	uint8_t bootmode = 0;
58 	int i;
59 	uint8_t masked;
60 
61 #if defined(CONFIG_MX23)
62 	/* Setup IOMUX of bootmode pads to GPIO */
63 	mxs_iomux_setup_multiple_pads(iomux_boot, ARRAY_SIZE(iomux_boot));
64 
65 	/* Setup bootmode pins as GPIO input */
66 	gpio_direction_input(MX23_PAD_LCD_D00__GPIO_1_0);
67 	gpio_direction_input(MX23_PAD_LCD_D01__GPIO_1_1);
68 	gpio_direction_input(MX23_PAD_LCD_D02__GPIO_1_2);
69 	gpio_direction_input(MX23_PAD_LCD_D03__GPIO_1_3);
70 	gpio_direction_input(MX23_PAD_LCD_D05__GPIO_1_5);
71 
72 	/* Read bootmode pads */
73 	bootmode |= (gpio_get_value(MX23_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0;
74 	bootmode |= (gpio_get_value(MX23_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1;
75 	bootmode |= (gpio_get_value(MX23_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2;
76 	bootmode |= (gpio_get_value(MX23_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3;
77 	bootmode |= (gpio_get_value(MX23_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5;
78 #elif defined(CONFIG_MX28)
79 	/* The global boot mode will be detected by ROM code and its value
80 	 * is stored at the fixed address 0x00019BF0 in OCRAM.
81 	 */
82 #define GLOBAL_BOOT_MODE_ADDR 0x00019BF0
83 	bootmode = __raw_readl(GLOBAL_BOOT_MODE_ADDR);
84 #endif
85 
86 	for (i = 0; i < ARRAY_SIZE(mxs_boot_modes); i++) {
87 		masked = bootmode & mxs_boot_modes[i].boot_mask;
88 		if (masked == mxs_boot_modes[i].boot_pads)
89 			break;
90 	}
91 
92 	return i;
93 }
94 
95 static void mxs_spl_fixup_vectors(void)
96 {
97 	/*
98 	 * Copy our vector table to 0x0, since due to HAB, we cannot
99 	 * be loaded to 0x0. We want to have working vectoring though,
100 	 * thus this fixup. Our vectoring table is PIC, so copying is
101 	 * fine.
102 	 */
103 	extern uint32_t _start;
104 
105 	/* cppcheck-suppress nullPointer */
106 	memcpy(0x0, &_start, 0x60);
107 }
108 
109 static void mxs_spl_console_init(void)
110 {
111 #ifdef CONFIG_SPL_SERIAL_SUPPORT
112 	gd->bd = &bdata;
113 	gd->baudrate = CONFIG_BAUDRATE;
114 	serial_init();
115 	gd->have_console = 1;
116 #endif
117 }
118 
119 void mxs_common_spl_init(const uint32_t arg, const uint32_t *resptr,
120 			 const iomux_cfg_t *iomux_setup,
121 			 const unsigned int iomux_size)
122 {
123 	struct mxs_spl_data *data = (struct mxs_spl_data *)
124 		((CONFIG_SYS_TEXT_BASE - sizeof(struct mxs_spl_data)) & ~0xf);
125 	uint8_t bootmode = mxs_get_bootmode_index();
126 	gd = &gdata;
127 
128 	mxs_spl_fixup_vectors();
129 
130 	mxs_iomux_setup_multiple_pads(iomux_setup, iomux_size);
131 
132 	mxs_spl_console_init();
133 	debug("SPL: Serial Console Initialised\n");
134 
135 	mxs_power_init();
136 
137 	mxs_mem_init();
138 	data->mem_dram_size = mxs_mem_get_size();
139 
140 	data->boot_mode_idx = bootmode;
141 
142 	mxs_power_wait_pswitch();
143 
144 	if (mxs_boot_modes[data->boot_mode_idx].boot_pads == MXS_BM_JTAG) {
145 		debug("SPL: Waiting for JTAG user\n");
146 		asm volatile ("x: b x");
147 	}
148 }
149 
150 /* Support aparatus */
151 inline void board_init_f(unsigned long bootflag)
152 {
153 	for (;;)
154 		;
155 }
156 
157 inline void board_init_r(gd_t *id, ulong dest_addr)
158 {
159 	for (;;)
160 		;
161 }
162