2 * Freescale i.MX28 Boot setup
4 * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
5 * on behalf of DENX Software Engineering GmbH
7 * See file CREDITS for list of people who contributed to this
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.
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.
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,
29 #include <asm/arch/iomux-mx28.h>
30 #include <asm/arch/imx-regs.h>
31 #include <asm/arch/sys_proto.h>
34 #include "mx28_init.h"
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.
43 * There's nothing to be taken into consideration for the rollover.
44 * Two's complement arithmetic used correctly does all the magic automagically.
46 #define HW_DIGCTRL_MICROSECONDS 0x8001c0c0
47 void early_delay(int delay)
49 uint32_t st = readl(HW_DIGCTRL_MICROSECONDS);
51 while (readl(HW_DIGCTRL_MICROSECONDS) - st < delay);
54 #define MUX_CONFIG_BOOTMODE_PAD (MXS_PAD_3V3 | MXS_PAD_4MA | MXS_PAD_NOPULL)
55 const iomux_cfg_t iomux_boot[] = {
56 MX28_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD,
57 MX28_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD,
58 MX28_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD,
59 MX28_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD,
60 MX28_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD,
61 MX28_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD,
64 uint8_t mx28_get_bootmode_index(void)
70 /* Setup IOMUX of bootmode pads to GPIO */
71 mxs_iomux_setup_multiple_pads(iomux_boot, ARRAY_SIZE(iomux_boot));
73 /* Setup bootmode pins as GPIO input */
74 gpio_direction_input(MX28_PAD_LCD_D00__GPIO_1_0);
75 gpio_direction_input(MX28_PAD_LCD_D01__GPIO_1_1);
76 gpio_direction_input(MX28_PAD_LCD_D02__GPIO_1_2);
77 gpio_direction_input(MX28_PAD_LCD_D03__GPIO_1_3);
78 gpio_direction_input(MX28_PAD_LCD_D04__GPIO_1_4);
79 gpio_direction_input(MX28_PAD_LCD_D05__GPIO_1_5);
81 /* Read bootmode pads */
82 bootmode |= (gpio_get_value(MX28_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0;
83 bootmode |= (gpio_get_value(MX28_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1;
84 bootmode |= (gpio_get_value(MX28_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2;
85 bootmode |= (gpio_get_value(MX28_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3;
86 bootmode |= (gpio_get_value(MX28_PAD_LCD_D04__GPIO_1_4) ? 1 : 0) << 4;
87 bootmode |= (gpio_get_value(MX28_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5;
89 for (i = 0; i < ARRAY_SIZE(mx28_boot_modes); i++) {
90 masked = bootmode & mx28_boot_modes[i].boot_mask;
91 if (masked == mx28_boot_modes[i].boot_pads)
98 void mx28_common_spl_init(const iomux_cfg_t *iomux_setup,
99 const unsigned int iomux_size)
101 struct mx28_spl_data *data = (struct mx28_spl_data *)
102 ((CONFIG_SYS_TEXT_BASE - sizeof(struct mx28_spl_data)) & ~0xf);
103 uint8_t bootmode = mx28_get_bootmode_index();
105 mxs_iomux_setup_multiple_pads(iomux_setup, iomux_size);
109 data->mem_dram_size = mx28_mem_get_size();
111 data->boot_mode_idx = bootmode;
113 mx28_power_wait_pswitch();
116 /* Support apparatus */
117 inline void board_init_f(unsigned long bootflag)
123 inline void board_init_r(gd_t *id, ulong dest_addr)
129 #ifndef CONFIG_SPL_SERIAL_SUPPORT
130 void serial_putc(const char c) {}
131 void serial_puts(const char *s) {}
133 void hang(void) __attribute__ ((noreturn));
136 serial_puts("ERROR: please reset the target\n");