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 17 #include "mxs_init.h" 18 19 /* 20 * This delay function is intended to be used only in early stage of boot, where 21 * clock are not set up yet. The timer used here is reset on every boot and 22 * takes a few seconds to roll. The boot doesn't take that long, so to keep the 23 * code simple, it doesn't take rolling into consideration. 24 */ 25 void early_delay(int delay) 26 { 27 struct mxs_digctl_regs *digctl_regs = 28 (struct mxs_digctl_regs *)MXS_DIGCTL_BASE; 29 30 uint32_t st = readl(&digctl_regs->hw_digctl_microseconds); 31 st += delay; 32 while (st > readl(&digctl_regs->hw_digctl_microseconds)) 33 ; 34 } 35 36 #define MUX_CONFIG_BOOTMODE_PAD (MXS_PAD_3V3 | MXS_PAD_4MA | MXS_PAD_NOPULL) 37 static const iomux_cfg_t iomux_boot[] = { 38 #if defined(CONFIG_MX23) 39 MX23_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD, 40 MX23_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD, 41 MX23_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD, 42 MX23_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD, 43 MX23_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD, 44 MX23_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD, 45 #elif defined(CONFIG_MX28) 46 MX28_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD, 47 MX28_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD, 48 MX28_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD, 49 MX28_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD, 50 MX28_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD, 51 MX28_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD, 52 #endif 53 }; 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 /* Setup IOMUX of bootmode pads to GPIO */ 62 mxs_iomux_setup_multiple_pads(iomux_boot, ARRAY_SIZE(iomux_boot)); 63 64 #if defined(CONFIG_MX23) 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 /* Setup bootmode pins as GPIO input */ 80 gpio_direction_input(MX28_PAD_LCD_D00__GPIO_1_0); 81 gpio_direction_input(MX28_PAD_LCD_D01__GPIO_1_1); 82 gpio_direction_input(MX28_PAD_LCD_D02__GPIO_1_2); 83 gpio_direction_input(MX28_PAD_LCD_D03__GPIO_1_3); 84 gpio_direction_input(MX28_PAD_LCD_D04__GPIO_1_4); 85 gpio_direction_input(MX28_PAD_LCD_D05__GPIO_1_5); 86 87 /* Read bootmode pads */ 88 bootmode |= (gpio_get_value(MX28_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0; 89 bootmode |= (gpio_get_value(MX28_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1; 90 bootmode |= (gpio_get_value(MX28_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2; 91 bootmode |= (gpio_get_value(MX28_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3; 92 bootmode |= (gpio_get_value(MX28_PAD_LCD_D04__GPIO_1_4) ? 1 : 0) << 4; 93 bootmode |= (gpio_get_value(MX28_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5; 94 #endif 95 96 for (i = 0; i < ARRAY_SIZE(mxs_boot_modes); i++) { 97 masked = bootmode & mxs_boot_modes[i].boot_mask; 98 if (masked == mxs_boot_modes[i].boot_pads) 99 break; 100 } 101 102 return i; 103 } 104 105 void mxs_common_spl_init(const uint32_t arg, const uint32_t *resptr, 106 const iomux_cfg_t *iomux_setup, 107 const unsigned int iomux_size) 108 { 109 struct mxs_spl_data *data = (struct mxs_spl_data *) 110 ((CONFIG_SYS_TEXT_BASE - sizeof(struct mxs_spl_data)) & ~0xf); 111 uint8_t bootmode = mxs_get_bootmode_index(); 112 113 mxs_iomux_setup_multiple_pads(iomux_setup, iomux_size); 114 mxs_power_init(); 115 116 mxs_mem_init(); 117 data->mem_dram_size = mxs_mem_get_size(); 118 119 data->boot_mode_idx = bootmode; 120 121 mxs_power_wait_pswitch(); 122 } 123 124 /* Support aparatus */ 125 inline void board_init_f(unsigned long bootflag) 126 { 127 for (;;) 128 ; 129 } 130 131 inline void board_init_r(gd_t *id, ulong dest_addr) 132 { 133 for (;;) 134 ; 135 } 136