1 // SPDX-License-Identifier: GPL-2.0+
3 * Freescale i.MX28 Boot setup
5 * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
6 * on behalf of DENX Software Engineering GmbH
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.
30 void early_delay(int delay)
32 struct mxs_digctl_regs *digctl_regs =
33 (struct mxs_digctl_regs *)MXS_DIGCTL_BASE;
35 uint32_t st = readl(&digctl_regs->hw_digctl_microseconds);
36 while (readl(&digctl_regs->hw_digctl_microseconds) - st <= delay)
40 #if defined(CONFIG_MX23)
41 #define MUX_CONFIG_BOOTMODE_PAD (MXS_PAD_3V3 | MXS_PAD_4MA | MXS_PAD_NOPULL)
42 static const iomux_cfg_t iomux_boot[] = {
43 MX23_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD,
44 MX23_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD,
45 MX23_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD,
46 MX23_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD,
47 MX23_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD,
48 MX23_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD,
52 static uint8_t mxs_get_bootmode_index(void)
58 #if defined(CONFIG_MX23)
59 /* Setup IOMUX of bootmode pads to GPIO */
60 mxs_iomux_setup_multiple_pads(iomux_boot, ARRAY_SIZE(iomux_boot));
62 /* Setup bootmode pins as GPIO input */
63 gpio_direction_input(MX23_PAD_LCD_D00__GPIO_1_0);
64 gpio_direction_input(MX23_PAD_LCD_D01__GPIO_1_1);
65 gpio_direction_input(MX23_PAD_LCD_D02__GPIO_1_2);
66 gpio_direction_input(MX23_PAD_LCD_D03__GPIO_1_3);
67 gpio_direction_input(MX23_PAD_LCD_D05__GPIO_1_5);
69 /* Read bootmode pads */
70 bootmode |= (gpio_get_value(MX23_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0;
71 bootmode |= (gpio_get_value(MX23_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1;
72 bootmode |= (gpio_get_value(MX23_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2;
73 bootmode |= (gpio_get_value(MX23_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3;
74 bootmode |= (gpio_get_value(MX23_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5;
75 #elif defined(CONFIG_MX28)
76 /* The global boot mode will be detected by ROM code and its value
77 * is stored at the fixed address 0x00019BF0 in OCRAM.
79 #define GLOBAL_BOOT_MODE_ADDR 0x00019BF0
80 bootmode = __raw_readl(GLOBAL_BOOT_MODE_ADDR);
83 for (i = 0; i < ARRAY_SIZE(mxs_boot_modes); i++) {
84 masked = bootmode & mxs_boot_modes[i].boot_mask;
85 if (masked == mxs_boot_modes[i].boot_pads)
92 static void mxs_spl_fixup_vectors(void)
95 * Copy our vector table to 0x0, since due to HAB, we cannot
96 * be loaded to 0x0. We want to have working vectoring though,
97 * thus this fixup. Our vectoring table is PIC, so copying is
100 extern uint32_t _start;
102 /* cppcheck-suppress nullPointer */
103 memcpy(0x0, &_start, 0x60);
106 static void mxs_spl_console_init(void)
108 #ifdef CONFIG_SPL_SERIAL_SUPPORT
110 gd->baudrate = CONFIG_BAUDRATE;
112 gd->have_console = 1;
116 void mxs_common_spl_init(const uint32_t arg, const uint32_t *resptr,
117 const iomux_cfg_t *iomux_setup,
118 const unsigned int iomux_size)
120 struct mxs_spl_data *data = MXS_SPL_DATA;
121 uint8_t bootmode = mxs_get_bootmode_index();
124 mxs_spl_fixup_vectors();
126 mxs_iomux_setup_multiple_pads(iomux_setup, iomux_size);
128 mxs_spl_console_init();
129 debug("SPL: Serial Console Initialised\n");
134 data->mem_dram_size = mxs_mem_get_size();
136 data->boot_mode_idx = bootmode;
138 mxs_power_wait_pswitch();
140 if (mxs_boot_modes[data->boot_mode_idx].boot_pads == MXS_BM_JTAG) {
141 debug("SPL: Waiting for JTAG user\n");
142 asm volatile ("x: b x");
146 #ifndef CONFIG_SPL_FRAMEWORK
147 /* Support aparatus */
148 inline void board_init_f(unsigned long bootflag)
154 inline void board_init_r(gd_t *id, ulong dest_addr)