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/iomux-mx28.h> 30 #include <asm/arch/imx-regs.h> 31 #include <asm/arch/sys_proto.h> 32 #include <asm/gpio.h> 33 34 #include "mxs_init.h" 35 36 /* 37 * This delay function is intended to be used only in early stage of boot, where 38 * clock are not set up yet. The timer used here is reset on every boot and 39 * takes a few seconds to roll. The boot doesn't take that long, so to keep the 40 * code simple, it doesn't take rolling into consideration. 41 */ 42 #define HW_DIGCTRL_MICROSECONDS 0x8001c0c0 43 void early_delay(int delay) 44 { 45 uint32_t st = readl(HW_DIGCTRL_MICROSECONDS); 46 st += delay; 47 while (st > readl(HW_DIGCTRL_MICROSECONDS)) 48 ; 49 } 50 51 #define MUX_CONFIG_BOOTMODE_PAD (MXS_PAD_3V3 | MXS_PAD_4MA | MXS_PAD_NOPULL) 52 const iomux_cfg_t iomux_boot[] = { 53 MX28_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD, 54 MX28_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD, 55 MX28_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD, 56 MX28_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD, 57 MX28_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD, 58 MX28_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD, 59 }; 60 61 uint8_t mxs_get_bootmode_index(void) 62 { 63 uint8_t bootmode = 0; 64 int i; 65 uint8_t masked; 66 67 /* Setup IOMUX of bootmode pads to GPIO */ 68 mxs_iomux_setup_multiple_pads(iomux_boot, ARRAY_SIZE(iomux_boot)); 69 70 /* Setup bootmode pins as GPIO input */ 71 gpio_direction_input(MX28_PAD_LCD_D00__GPIO_1_0); 72 gpio_direction_input(MX28_PAD_LCD_D01__GPIO_1_1); 73 gpio_direction_input(MX28_PAD_LCD_D02__GPIO_1_2); 74 gpio_direction_input(MX28_PAD_LCD_D03__GPIO_1_3); 75 gpio_direction_input(MX28_PAD_LCD_D04__GPIO_1_4); 76 gpio_direction_input(MX28_PAD_LCD_D05__GPIO_1_5); 77 78 /* Read bootmode pads */ 79 bootmode |= (gpio_get_value(MX28_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0; 80 bootmode |= (gpio_get_value(MX28_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1; 81 bootmode |= (gpio_get_value(MX28_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2; 82 bootmode |= (gpio_get_value(MX28_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3; 83 bootmode |= (gpio_get_value(MX28_PAD_LCD_D04__GPIO_1_4) ? 1 : 0) << 4; 84 bootmode |= (gpio_get_value(MX28_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5; 85 86 for (i = 0; i < ARRAY_SIZE(mx28_boot_modes); i++) { 87 masked = bootmode & mx28_boot_modes[i].boot_mask; 88 if (masked == mx28_boot_modes[i].boot_pads) 89 break; 90 } 91 92 return i; 93 } 94 95 void mxs_common_spl_init(const iomux_cfg_t *iomux_setup, 96 const unsigned int iomux_size) 97 { 98 struct mxs_spl_data *data = (struct mxs_spl_data *) 99 ((CONFIG_SYS_TEXT_BASE - sizeof(struct mxs_spl_data)) & ~0xf); 100 uint8_t bootmode = mxs_get_bootmode_index(); 101 102 mxs_iomux_setup_multiple_pads(iomux_setup, iomux_size); 103 mxs_power_init(); 104 105 mxs_mem_init(); 106 data->mem_dram_size = mxs_mem_get_size(); 107 108 data->boot_mode_idx = bootmode; 109 110 mxs_power_wait_pswitch(); 111 } 112 113 /* Support aparatus */ 114 inline void board_init_f(unsigned long bootflag) 115 { 116 for (;;) 117 ; 118 } 119 120 inline void board_init_r(gd_t *id, ulong dest_addr) 121 { 122 for (;;) 123 ; 124 } 125 126 #ifndef CONFIG_SPL_SERIAL_SUPPORT 127 void serial_putc(const char c) {} 128 void serial_puts(const char *s) {} 129 #endif 130 void hang(void) __attribute__ ((noreturn)); 131 void hang(void) 132 { 133 for (;;) 134 ; 135 } 136