mirror of
https://github.com/AsahiLinux/u-boot
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f8c4a86b5e
This patch implements code that samples i.MX28 boot pads and reports boot mode accordingly. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Detlev Zundel <dzu@denx.de> Cc: Fabio Estevam <fabio.estevam@freescale.com> Cc: Stefano Babic <sbabic@denx.de> Cc: Wolfgang Denk <wd@denx.de>
133 lines
4 KiB
C
133 lines
4 KiB
C
/*
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* Freescale i.MX28 Boot setup
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*
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* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
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* on behalf of DENX Software Engineering GmbH
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <config.h>
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#include <asm/io.h>
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#include <asm/arch/iomux-mx28.h>
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#include <asm/arch/imx-regs.h>
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#include <asm/arch/sys_proto.h>
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#include <asm/gpio.h>
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#include "mx28_init.h"
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/*
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* This delay function is intended to be used only in early stage of boot, where
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* clock are not set up yet. The timer used here is reset on every boot and
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* takes a few seconds to roll. The boot doesn't take that long, so to keep the
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* code simple, it doesn't take rolling into consideration.
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*/
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#define HW_DIGCTRL_MICROSECONDS 0x8001c0c0
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void early_delay(int delay)
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{
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uint32_t st = readl(HW_DIGCTRL_MICROSECONDS);
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st += delay;
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while (st > readl(HW_DIGCTRL_MICROSECONDS))
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;
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}
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#define MUX_CONFIG_BOOTMODE_PAD (MXS_PAD_3V3 | MXS_PAD_4MA | MXS_PAD_NOPULL)
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const iomux_cfg_t iomux_boot[] = {
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MX28_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD,
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MX28_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD,
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MX28_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD,
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MX28_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD,
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MX28_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD,
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MX28_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD,
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};
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uint8_t mx28_get_bootmode_index(void)
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{
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uint8_t bootmode = 0;
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int i;
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uint8_t masked;
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/* Setup IOMUX of bootmode pads to GPIO */
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mxs_iomux_setup_multiple_pads(iomux_boot, ARRAY_SIZE(iomux_boot));
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/* Setup bootmode pins as GPIO input */
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gpio_direction_input(MX28_PAD_LCD_D00__GPIO_1_0);
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gpio_direction_input(MX28_PAD_LCD_D01__GPIO_1_1);
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gpio_direction_input(MX28_PAD_LCD_D02__GPIO_1_2);
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gpio_direction_input(MX28_PAD_LCD_D03__GPIO_1_3);
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gpio_direction_input(MX28_PAD_LCD_D04__GPIO_1_4);
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gpio_direction_input(MX28_PAD_LCD_D05__GPIO_1_5);
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/* Read bootmode pads */
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bootmode |= (gpio_get_value(MX28_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0;
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bootmode |= (gpio_get_value(MX28_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1;
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bootmode |= (gpio_get_value(MX28_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2;
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bootmode |= (gpio_get_value(MX28_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3;
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bootmode |= (gpio_get_value(MX28_PAD_LCD_D04__GPIO_1_4) ? 1 : 0) << 4;
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bootmode |= (gpio_get_value(MX28_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5;
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for (i = 0; i < ARRAY_SIZE(mx28_boot_modes); i++) {
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masked = bootmode & mx28_boot_modes[i].boot_mask;
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if (masked == mx28_boot_modes[i].boot_pads)
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break;
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}
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return i;
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}
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void mx28_common_spl_init(const iomux_cfg_t *iomux_setup,
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const unsigned int iomux_size)
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{
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struct mx28_spl_data *data = (struct mx28_spl_data *)
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((CONFIG_SYS_TEXT_BASE - sizeof(struct mx28_spl_data)) & ~0xf);
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uint8_t bootmode = mx28_get_bootmode_index();
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mxs_iomux_setup_multiple_pads(iomux_setup, iomux_size);
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mx28_power_init();
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mx28_mem_init();
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data->mem_dram_size = mx28_mem_get_size();
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data->boot_mode_idx = bootmode;
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mx28_power_wait_pswitch();
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}
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/* Support aparatus */
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inline void board_init_f(unsigned long bootflag)
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{
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for (;;)
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;
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}
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inline void board_init_r(gd_t *id, ulong dest_addr)
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{
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for (;;)
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;
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}
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void serial_putc(const char c) {}
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void serial_puts(const char *s) {}
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void hang(void) __attribute__ ((noreturn));
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void hang(void)
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{
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for (;;)
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;
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}
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