1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Freescale i.MX28 Boot setup 4 * 5 * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com> 6 * on behalf of DENX Software Engineering GmbH 7 */ 8 9 #include <common.h> 10 #include <config.h> 11 #include <init.h> 12 #include <log.h> 13 #include <serial.h> 14 #include <asm/global_data.h> 15 #include <asm/io.h> 16 #include <asm/arch/imx-regs.h> 17 #include <asm/arch/sys_proto.h> 18 #include <asm/gpio.h> 19 #include <asm/sections.h> 20 #include <linux/compiler.h> 21 22 #include "mxs_init.h" 23 24 DECLARE_GLOBAL_DATA_PTR; 25 static gd_t gdata __section(".data"); 26 #ifdef CONFIG_SPL_SERIAL_SUPPORT 27 static struct bd_info bdata __section(".data"); 28 #endif 29 30 /* 31 * This delay function is intended to be used only in early stage of boot, where 32 * clock are not set up yet. 33 */ 34 void early_delay(int delay) 35 { 36 struct mxs_digctl_regs *digctl_regs = 37 (struct mxs_digctl_regs *)MXS_DIGCTL_BASE; 38 39 uint32_t st = readl(&digctl_regs->hw_digctl_microseconds); 40 while (readl(&digctl_regs->hw_digctl_microseconds) - st <= delay) 41 ; 42 } 43 44 #if defined(CONFIG_MX23) 45 #define MUX_CONFIG_BOOTMODE_PAD (MXS_PAD_3V3 | MXS_PAD_4MA | MXS_PAD_NOPULL) 46 static const iomux_cfg_t iomux_boot[] = { 47 MX23_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD, 48 MX23_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD, 49 MX23_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD, 50 MX23_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD, 51 MX23_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD, 52 MX23_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD, 53 }; 54 #endif 55 56 static uint8_t mxs_get_bootmode_index(void) 57 { 58 uint8_t bootmode = 0; 59 int i; 60 uint8_t masked; 61 62 #if defined(CONFIG_MX23) 63 /* Setup IOMUX of bootmode pads to GPIO */ 64 mxs_iomux_setup_multiple_pads(iomux_boot, ARRAY_SIZE(iomux_boot)); 65 66 /* Setup bootmode pins as GPIO input */ 67 gpio_direction_input(MX23_PAD_LCD_D00__GPIO_1_0); 68 gpio_direction_input(MX23_PAD_LCD_D01__GPIO_1_1); 69 gpio_direction_input(MX23_PAD_LCD_D02__GPIO_1_2); 70 gpio_direction_input(MX23_PAD_LCD_D03__GPIO_1_3); 71 gpio_direction_input(MX23_PAD_LCD_D05__GPIO_1_5); 72 73 /* Read bootmode pads */ 74 bootmode |= (gpio_get_value(MX23_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0; 75 bootmode |= (gpio_get_value(MX23_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1; 76 bootmode |= (gpio_get_value(MX23_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2; 77 bootmode |= (gpio_get_value(MX23_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3; 78 bootmode |= (gpio_get_value(MX23_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5; 79 #elif defined(CONFIG_MX28) 80 /* The global boot mode will be detected by ROM code and its value 81 * is stored at the fixed address 0x00019BF0 in OCRAM. 82 */ 83 #define GLOBAL_BOOT_MODE_ADDR 0x00019BF0 84 bootmode = __raw_readl(GLOBAL_BOOT_MODE_ADDR); 85 #endif 86 87 for (i = 0; i < ARRAY_SIZE(mxs_boot_modes); i++) { 88 masked = bootmode & mxs_boot_modes[i].boot_mask; 89 if (masked == mxs_boot_modes[i].boot_pads) 90 break; 91 } 92 93 return i; 94 } 95 96 static void mxs_spl_fixup_vectors(void) 97 { 98 /* 99 * Copy our vector table to 0x0, since due to HAB, we cannot 100 * be loaded to 0x0. We want to have working vectoring though, 101 * thus this fixup. Our vectoring table is PIC, so copying is 102 * fine. 103 */ 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 = MXS_SPL_DATA; 124 uint8_t bootmode = mxs_get_bootmode_index(); 125 set_gd(&gdata); 126 127 mxs_spl_fixup_vectors(); 128 129 mxs_iomux_setup_multiple_pads(iomux_setup, iomux_size); 130 131 mxs_spl_console_init(); 132 debug("SPL: Serial Console Initialised\n"); 133 134 mxs_power_init(); 135 136 mxs_mem_init(); 137 data->mem_dram_size = mxs_mem_get_size(); 138 139 data->boot_mode_idx = bootmode; 140 141 mxs_power_wait_pswitch(); 142 143 if (mxs_boot_modes[data->boot_mode_idx].boot_pads == MXS_BM_JTAG) { 144 debug("SPL: Waiting for JTAG user\n"); 145 asm volatile ("x: b x"); 146 } 147 } 148 149 #ifndef CONFIG_SPL_FRAMEWORK 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 #endif 163