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 #define HW_DIGCTRL_MICROSECONDS 0x8001c0c0 42 void early_delay(int delay) 43 { 44 uint32_t st = readl(HW_DIGCTRL_MICROSECONDS); 45 st += delay; 46 while (st > readl(HW_DIGCTRL_MICROSECONDS)) 47 ; 48 } 49 50 #define MUX_CONFIG_BOOTMODE_PAD (MXS_PAD_3V3 | MXS_PAD_4MA | MXS_PAD_NOPULL) 51 const iomux_cfg_t iomux_boot[] = { 52 MX28_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD, 53 MX28_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD, 54 MX28_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD, 55 MX28_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD, 56 MX28_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD, 57 MX28_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD, 58 }; 59 60 uint8_t mxs_get_bootmode_index(void) 61 { 62 uint8_t bootmode = 0; 63 int i; 64 uint8_t masked; 65 66 /* Setup IOMUX of bootmode pads to GPIO */ 67 mxs_iomux_setup_multiple_pads(iomux_boot, ARRAY_SIZE(iomux_boot)); 68 69 /* Setup bootmode pins as GPIO input */ 70 gpio_direction_input(MX28_PAD_LCD_D00__GPIO_1_0); 71 gpio_direction_input(MX28_PAD_LCD_D01__GPIO_1_1); 72 gpio_direction_input(MX28_PAD_LCD_D02__GPIO_1_2); 73 gpio_direction_input(MX28_PAD_LCD_D03__GPIO_1_3); 74 gpio_direction_input(MX28_PAD_LCD_D04__GPIO_1_4); 75 gpio_direction_input(MX28_PAD_LCD_D05__GPIO_1_5); 76 77 /* Read bootmode pads */ 78 bootmode |= (gpio_get_value(MX28_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0; 79 bootmode |= (gpio_get_value(MX28_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1; 80 bootmode |= (gpio_get_value(MX28_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2; 81 bootmode |= (gpio_get_value(MX28_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3; 82 bootmode |= (gpio_get_value(MX28_PAD_LCD_D04__GPIO_1_4) ? 1 : 0) << 4; 83 bootmode |= (gpio_get_value(MX28_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5; 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 void mxs_common_spl_init(const iomux_cfg_t *iomux_setup, 95 const unsigned int iomux_size) 96 { 97 struct mxs_spl_data *data = (struct mxs_spl_data *) 98 ((CONFIG_SYS_TEXT_BASE - sizeof(struct mxs_spl_data)) & ~0xf); 99 uint8_t bootmode = mxs_get_bootmode_index(); 100 101 mxs_iomux_setup_multiple_pads(iomux_setup, iomux_size); 102 mxs_power_init(); 103 104 mxs_mem_init(); 105 data->mem_dram_size = mxs_mem_get_size(); 106 107 data->boot_mode_idx = bootmode; 108 109 mxs_power_wait_pswitch(); 110 } 111 112 /* Support aparatus */ 113 inline void board_init_f(unsigned long bootflag) 114 { 115 for (;;) 116 ; 117 } 118 119 inline void board_init_r(gd_t *id, ulong dest_addr) 120 { 121 for (;;) 122 ; 123 } 124 125 #ifndef CONFIG_SPL_SERIAL_SUPPORT 126 void serial_putc(const char c) {} 127 void serial_puts(const char *s) {} 128 #endif 129 void hang(void) __attribute__ ((noreturn)); 130 void hang(void) 131 { 132 for (;;) 133 ; 134 } 135