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/*
* 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/iomux-mx28.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/sys_proto.h>
#include <asm/gpio.h>
#include "mx28_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 mx28_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(mx28_boot_modes); i++) {
masked = bootmode & mx28_boot_modes[i].boot_mask;
if (masked == mx28_boot_modes[i].boot_pads)
break;
}
return i;
}
void mx28_common_spl_init(const iomux_cfg_t *iomux_setup,
const unsigned int iomux_size)
{
struct mx28_spl_data *data = (struct mx28_spl_data *)
((CONFIG_SYS_TEXT_BASE - sizeof(struct mx28_spl_data)) & ~0xf);
uint8_t bootmode = mx28_get_bootmode_index();
mxs_iomux_setup_multiple_pads(iomux_setup, iomux_size);
mx28_power_init();
mx28_mem_init();
data->mem_dram_size = mx28_mem_get_size();
data->boot_mode_idx = bootmode;
mx28_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 (;;)
;
}
void serial_putc(const char c) {}
void serial_puts(const char *s) {}
void hang(void) __attribute__ ((noreturn));
void hang(void)
{
for (;;)
;
}
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