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 * See file CREDITS for list of people who contributed to this 8 * project. 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License as 12 * published by the Free Software Foundation; either version 2 of 13 * the License, or (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 23 * MA 02111-1307 USA 24 */ 25 26 #include <common.h> 27 #include <config.h> 28 #include <asm/io.h> 29 #include <asm/arch/imx-regs.h> 30 #include <asm/arch/sys_proto.h> 31 #include <asm/gpio.h> 32 33 #include "mxs_init.h" 34 35 /* 36 * This delay function is intended to be used only in early stage of boot, where 37 * clock are not set up yet. The timer used here is reset on every boot and 38 * takes a few seconds to roll. The boot doesn't take that long, so to keep the 39 * code simple, it doesn't take rolling into consideration. 40 */ 41 void early_delay(int delay) 42 { 43 struct mxs_digctl_regs *digctl_regs = 44 (struct mxs_digctl_regs *)MXS_DIGCTL_BASE; 45 46 uint32_t st = readl(&digctl_regs->hw_digctl_microseconds); 47 st += delay; 48 while (st > readl(&digctl_regs->hw_digctl_microseconds)) 49 ; 50 } 51 52 #define MUX_CONFIG_BOOTMODE_PAD (MXS_PAD_3V3 | MXS_PAD_4MA | MXS_PAD_NOPULL) 53 static const iomux_cfg_t iomux_boot[] = { 54 MX28_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD, 55 MX28_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD, 56 MX28_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD, 57 MX28_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD, 58 MX28_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD, 59 MX28_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD, 60 }; 61 62 static uint8_t mxs_get_bootmode_index(void) 63 { 64 uint8_t bootmode = 0; 65 int i; 66 uint8_t masked; 67 68 /* Setup IOMUX of bootmode pads to GPIO */ 69 mxs_iomux_setup_multiple_pads(iomux_boot, ARRAY_SIZE(iomux_boot)); 70 71 /* Setup bootmode pins as GPIO input */ 72 gpio_direction_input(MX28_PAD_LCD_D00__GPIO_1_0); 73 gpio_direction_input(MX28_PAD_LCD_D01__GPIO_1_1); 74 gpio_direction_input(MX28_PAD_LCD_D02__GPIO_1_2); 75 gpio_direction_input(MX28_PAD_LCD_D03__GPIO_1_3); 76 gpio_direction_input(MX28_PAD_LCD_D04__GPIO_1_4); 77 gpio_direction_input(MX28_PAD_LCD_D05__GPIO_1_5); 78 79 /* Read bootmode pads */ 80 bootmode |= (gpio_get_value(MX28_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0; 81 bootmode |= (gpio_get_value(MX28_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1; 82 bootmode |= (gpio_get_value(MX28_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2; 83 bootmode |= (gpio_get_value(MX28_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3; 84 bootmode |= (gpio_get_value(MX28_PAD_LCD_D04__GPIO_1_4) ? 1 : 0) << 4; 85 bootmode |= (gpio_get_value(MX28_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5; 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 void mxs_common_spl_init(const iomux_cfg_t *iomux_setup, 97 const unsigned int iomux_size) 98 { 99 struct mxs_spl_data *data = (struct mxs_spl_data *) 100 ((CONFIG_SYS_TEXT_BASE - sizeof(struct mxs_spl_data)) & ~0xf); 101 uint8_t bootmode = mxs_get_bootmode_index(); 102 103 mxs_iomux_setup_multiple_pads(iomux_setup, iomux_size); 104 mxs_power_init(); 105 106 mxs_mem_init(); 107 data->mem_dram_size = mxs_mem_get_size(); 108 109 data->boot_mode_idx = bootmode; 110 111 mxs_power_wait_pswitch(); 112 } 113 114 /* Support aparatus */ 115 inline void board_init_f(unsigned long bootflag) 116 { 117 for (;;) 118 ; 119 } 120 121 inline void board_init_r(gd_t *id, ulong dest_addr) 122 { 123 for (;;) 124 ; 125 } 126 127 void hang(void) __attribute__ ((noreturn)); 128 void hang(void) 129 { 130 for (;;) 131 ; 132 } 133