2 * Freescale i.MX28 Boot setup
4 * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
5 * on behalf of DENX Software Engineering GmbH
7 * SPDX-License-Identifier: GPL-2.0+
13 #include <asm/arch/imx-regs.h>
14 #include <asm/arch/sys_proto.h>
16 #include <linux/compiler.h>
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");
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.
33 * There's nothing to be taken into consideration for the rollover.
34 * Two's complement arithmetic used correctly does all that's needed
37 void early_delay(int delay)
39 struct mxs_digctl_regs *digctl_regs =
40 (struct mxs_digctl_regs *)MXS_DIGCTL_BASE;
41 u32 start = readl(&digctl_regs->hw_digctl_microseconds);
43 while (readl(&digctl_regs->hw_digctl_microseconds) - start < delay);
46 #define MUX_CONFIG_BOOTMODE_PAD (MXS_PAD_3V3 | MXS_PAD_4MA | MXS_PAD_NOPULL)
47 static const iomux_cfg_t iomux_boot[] = {
48 #if defined(CONFIG_SOC_MX23)
49 MX23_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD,
50 MX23_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD,
51 MX23_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD,
52 MX23_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD,
53 MX23_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD,
54 MX23_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD,
55 #elif defined(CONFIG_SOC_MX28)
56 MX28_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD,
57 MX28_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD,
58 MX28_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD,
59 MX28_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD,
60 MX28_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD,
61 MX28_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD,
65 static uint8_t mxs_get_bootmode_index(void)
71 /* Setup IOMUX of bootmode pads to GPIO */
72 mxs_iomux_setup_multiple_pads(iomux_boot, ARRAY_SIZE(iomux_boot));
74 #if defined(CONFIG_SOC_MX23)
75 /* Setup bootmode pins as GPIO input */
76 gpio_direction_input(MX23_PAD_LCD_D00__GPIO_1_0);
77 gpio_direction_input(MX23_PAD_LCD_D01__GPIO_1_1);
78 gpio_direction_input(MX23_PAD_LCD_D02__GPIO_1_2);
79 gpio_direction_input(MX23_PAD_LCD_D03__GPIO_1_3);
80 gpio_direction_input(MX23_PAD_LCD_D05__GPIO_1_5);
82 /* Read bootmode pads */
83 bootmode |= (gpio_get_value(MX23_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0;
84 bootmode |= (gpio_get_value(MX23_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1;
85 bootmode |= (gpio_get_value(MX23_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2;
86 bootmode |= (gpio_get_value(MX23_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3;
87 bootmode |= (gpio_get_value(MX23_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5;
88 #elif defined(CONFIG_SOC_MX28)
89 /* Setup bootmode pins as GPIO input */
90 gpio_direction_input(MX28_PAD_LCD_D00__GPIO_1_0);
91 gpio_direction_input(MX28_PAD_LCD_D01__GPIO_1_1);
92 gpio_direction_input(MX28_PAD_LCD_D02__GPIO_1_2);
93 gpio_direction_input(MX28_PAD_LCD_D03__GPIO_1_3);
94 gpio_direction_input(MX28_PAD_LCD_D04__GPIO_1_4);
95 gpio_direction_input(MX28_PAD_LCD_D05__GPIO_1_5);
97 /* Read bootmode pads */
98 bootmode |= (gpio_get_value(MX28_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0;
99 bootmode |= (gpio_get_value(MX28_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1;
100 bootmode |= (gpio_get_value(MX28_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2;
101 bootmode |= (gpio_get_value(MX28_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3;
102 bootmode |= (gpio_get_value(MX28_PAD_LCD_D04__GPIO_1_4) ? 1 : 0) << 4;
103 bootmode |= (gpio_get_value(MX28_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5;
106 for (i = 0; i < ARRAY_SIZE(mxs_boot_modes); i++) {
107 masked = bootmode & mxs_boot_modes[i].boot_mask;
108 if (masked == mxs_boot_modes[i].boot_pads)
115 static void mxs_spl_fixup_vectors(void)
118 * Copy our vector table to 0x0, since due to HAB, we cannot
119 * be loaded to 0x0. We want to have working vectoring though,
120 * thus this fixup. Our vectoring table is PIC, so copying is
123 extern uint32_t _start;
125 /* cppcheck-suppress nullPointer */
126 memcpy(0x0, &_start, 0x60);
129 static void mxs_spl_console_init(void)
131 #ifdef CONFIG_SPL_SERIAL_SUPPORT
133 gd->baudrate = CONFIG_BAUDRATE;
135 gd->have_console = 1;
139 void mxs_common_spl_init(const uint32_t arg, const uint32_t *resptr,
140 const iomux_cfg_t *iomux_setup,
141 const unsigned int iomux_size)
143 struct mxs_spl_data *data = (struct mxs_spl_data *)
144 ((CONFIG_SYS_TEXT_BASE - sizeof(struct mxs_spl_data)) & ~0xf);
145 uint8_t bootmode = mxs_get_bootmode_index();
148 mxs_spl_fixup_vectors();
150 mxs_iomux_setup_multiple_pads(iomux_setup, iomux_size);
152 mxs_spl_console_init();
153 debug("SPL: Serial Console Initialised\n");
158 data->mem_dram_size = mxs_mem_get_size();
160 data->boot_mode_idx = bootmode;
162 mxs_power_wait_pswitch();
164 if (mxs_boot_modes[data->boot_mode_idx].boot_pads == MXS_BM_JTAG) {
165 debug("SPL: Waiting for JTAG user\n");
166 asm volatile ("x: b x");
170 /* Support apparatus */
171 inline void board_init_f(unsigned long bootflag)
177 inline void board_init_r(gd_t *id, ulong dest_addr)