1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Freescale i.MX28 Boot setup 4 * 5 * Copyright (C) 2011 Marek Vasut <marek.vasut (at) gmail.com> 6 * on behalf of DENX Software Engineering GmbH 7 */ 8 9 #include <common.h> 10 #include <config.h> 11 #include <asm/io.h> 12 #include <asm/arch/imx-regs.h> 13 #include <asm/arch/sys_proto.h> 14 #include <asm/gpio.h> 15 #include <linux/compiler.h> 16 17 #include "mxs_init.h" 18 19 DECLARE_GLOBAL_DATA_PTR; 20 static gd_t gdata __section(".data"); 21 #ifdef CONFIG_SPL_SERIAL_SUPPORT 22 static bd_t bdata __section(".data"); 23 #endif 24 25 /* 26 * This delay function is intended to be used only in early stage of boot, where 27 * clock are not set up yet. The timer used here is reset on every boot and 28 * takes a few seconds to roll. The boot doesn't take that long, so to keep the 29 * code simple, it doesn't take rolling into consideration. 30 */ 31 void early_delay(int delay) 32 { 33 struct mxs_digctl_regs *digctl_regs = 34 (struct mxs_digctl_regs *)MXS_DIGCTL_BASE; 35 36 uint32_t st = readl(&digctl_regs->hw_digctl_microseconds); 37 st += delay; 38 while (st > readl(&digctl_regs->hw_digctl_microseconds)) 39 ; 40 } 41 42 #if defined(CONFIG_MX23) 43 #define MUX_CONFIG_BOOTMODE_PAD (MXS_PAD_3V3 | MXS_PAD_4MA | MXS_PAD_NOPULL) 44 static const iomux_cfg_t iomux_boot[] = { 45 MX23_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD, 46 MX23_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD, 47 MX23_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD, 48 MX23_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD, 49 MX23_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD, 50 MX23_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD, 51 }; 52 #endif 53 54 static uint8_t mxs_get_bootmode_index(void) 55 { 56 uint8_t bootmode = 0; 57 int i; 58 uint8_t masked; 59 60 #if defined(CONFIG_MX23) 61 /* Setup IOMUX of bootmode pads to GPIO */ 62 mxs_iomux_setup_multiple_pads(iomux_boot, ARRAY_SIZE(iomux_boot)); 63 64 /* Setup bootmode pins as GPIO input */ 65 gpio_direction_input(MX23_PAD_LCD_D00__GPIO_1_0); 66 gpio_direction_input(MX23_PAD_LCD_D01__GPIO_1_1); 67 gpio_direction_input(MX23_PAD_LCD_D02__GPIO_1_2); 68 gpio_direction_input(MX23_PAD_LCD_D03__GPIO_1_3); 69 gpio_direction_input(MX23_PAD_LCD_D05__GPIO_1_5); 70 71 /* Read bootmode pads */ 72 bootmode |= (gpio_get_value(MX23_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0; 73 bootmode |= (gpio_get_value(MX23_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1; 74 bootmode |= (gpio_get_value(MX23_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2; 75 bootmode |= (gpio_get_value(MX23_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3; 76 bootmode |= (gpio_get_value(MX23_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5; 77 #elif defined(CONFIG_MX28) 78 /* The global boot mode will be detected by ROM code and its value 79 * is stored at the fixed address 0x00019BF0 in OCRAM. 80 */ 81 #define GLOBAL_BOOT_MODE_ADDR 0x00019BF0 82 bootmode = __raw_readl(GLOBAL_BOOT_MODE_ADDR); 83 #endif 84 85 for (i = 0; i < ARRAY_SIZE(mxs_boot_modes); i++) { 86 masked = bootmode & mxs_boot_modes[i].boot_mask; 87 if (masked == mxs_boot_modes[i].boot_pads) 88 break; 89 } 90 91 return i; 92 } 93 94 static void mxs_spl_fixup_vectors(void) 95 { 96 /* 97 * Copy our vector table to 0x0, since due to HAB, we cannot 98 * be loaded to 0x0. We want to have working vectoring though, 99 * thus this fixup. Our vectoring table is PIC, so copying is 100 * fine. 101 */ 102 extern uint32_t _start; 103 104 /* cppcheck-suppress nullPointer */ 105 memcpy(0x0, &_start, 0x60); 106 } 107 108 static void mxs_spl_console_init(void) 109 { 110 #ifdef CONFIG_SPL_SERIAL_SUPPORT 111 gd->bd = &bdata; 112 gd->baudrate = CONFIG_BAUDRATE; 113 serial_init(); 114 gd->have_console = 1; 115 #endif 116 } 117 118 void mxs_common_spl_init(const uint32_t arg, const uint32_t *resptr, 119 const iomux_cfg_t *iomux_setup, 120 const unsigned int iomux_size) 121 { 122 struct mxs_spl_data *data = MXS_SPL_DATA; 123 uint8_t bootmode = mxs_get_bootmode_index(); 124 gd = &gdata; 125 126 mxs_spl_fixup_vectors(); 127 128 mxs_iomux_setup_multiple_pads(iomux_setup, iomux_size); 129 130 mxs_spl_console_init(); 131 debug("SPL: Serial Console Initialised\n"); 132 133 mxs_power_init(); 134 135 mxs_mem_init(); 136 data->mem_dram_size = mxs_mem_get_size(); 137 138 data->boot_mode_idx = bootmode; 139 140 mxs_power_wait_pswitch(); 141 142 if (mxs_boot_modes[data->boot_mode_idx].boot_pads == MXS_BM_JTAG) { 143 debug("SPL: Waiting for JTAG user\n"); 144 asm volatile ("x: b x"); 145 } 146 } 147 148 #ifndef CONFIG_SPL_FRAMEWORK 149 /* Support aparatus */ 150 inline void board_init_f(unsigned long bootflag) 151 { 152 for (;;) 153 ; 154 } 155 156 inline void board_init_r(gd_t *id, ulong dest_addr) 157 { 158 for (;;) 159 ; 160 } 161 #endif 162
