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 #if defined(CONFIG_MX23) 44 #define MUX_CONFIG_BOOTMODE_PAD (MXS_PAD_3V3 | MXS_PAD_4MA | MXS_PAD_NOPULL) 45 static const iomux_cfg_t iomux_boot[] = { 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 }; 53 #endif 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