/* * Freescale i.MX28 Boot setup * * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com> * on behalf of DENX Software Engineering GmbH * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ #include <common.h> #include <config.h> #include <asm/io.h> #include <asm/arch/imx-regs.h> #include <asm/arch/sys_proto.h> #include <asm/gpio.h> #include "mxs_init.h" /* * This delay function is intended to be used only in early stage of boot, where * clock are not set up yet. The timer used here is reset on every boot and * takes a few seconds to roll. The boot doesn't take that long, so to keep the * code simple, it doesn't take rolling into consideration. */ #define HW_DIGCTRL_MICROSECONDS 0x8001c0c0 void early_delay(int delay) { uint32_t st = readl(HW_DIGCTRL_MICROSECONDS); st += delay; while (st > readl(HW_DIGCTRL_MICROSECONDS)) ; } #define MUX_CONFIG_BOOTMODE_PAD (MXS_PAD_3V3 | MXS_PAD_4MA | MXS_PAD_NOPULL) const iomux_cfg_t iomux_boot[] = { MX28_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD, MX28_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD, MX28_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD, MX28_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD, MX28_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD, MX28_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD, }; uint8_t mxs_get_bootmode_index(void) { uint8_t bootmode = 0; int i; uint8_t masked; /* Setup IOMUX of bootmode pads to GPIO */ mxs_iomux_setup_multiple_pads(iomux_boot, ARRAY_SIZE(iomux_boot)); /* Setup bootmode pins as GPIO input */ gpio_direction_input(MX28_PAD_LCD_D00__GPIO_1_0); gpio_direction_input(MX28_PAD_LCD_D01__GPIO_1_1); gpio_direction_input(MX28_PAD_LCD_D02__GPIO_1_2); gpio_direction_input(MX28_PAD_LCD_D03__GPIO_1_3); gpio_direction_input(MX28_PAD_LCD_D04__GPIO_1_4); gpio_direction_input(MX28_PAD_LCD_D05__GPIO_1_5); /* Read bootmode pads */ bootmode |= (gpio_get_value(MX28_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0; bootmode |= (gpio_get_value(MX28_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1; bootmode |= (gpio_get_value(MX28_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2; bootmode |= (gpio_get_value(MX28_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3; bootmode |= (gpio_get_value(MX28_PAD_LCD_D04__GPIO_1_4) ? 1 : 0) << 4; bootmode |= (gpio_get_value(MX28_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5; for (i = 0; i < ARRAY_SIZE(mxs_boot_modes); i++) { masked = bootmode & mxs_boot_modes[i].boot_mask; if (masked == mxs_boot_modes[i].boot_pads) break; } return i; } void mxs_common_spl_init(const iomux_cfg_t *iomux_setup, const unsigned int iomux_size) { struct mxs_spl_data *data = (struct mxs_spl_data *) ((CONFIG_SYS_TEXT_BASE - sizeof(struct mxs_spl_data)) & ~0xf); uint8_t bootmode = mxs_get_bootmode_index(); mxs_iomux_setup_multiple_pads(iomux_setup, iomux_size); mxs_power_init(); mxs_mem_init(); data->mem_dram_size = mxs_mem_get_size(); data->boot_mode_idx = bootmode; mxs_power_wait_pswitch(); } /* Support aparatus */ inline void board_init_f(unsigned long bootflag) { for (;;) ; } inline void board_init_r(gd_t *id, ulong dest_addr) { for (;;) ; } #ifndef CONFIG_SPL_SERIAL_SUPPORT void serial_putc(const char c) {} void serial_puts(const char *s) {} #endif void hang(void) __attribute__ ((noreturn)); void hang(void) { for (;;) ; }