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 void early_delay(int delay)
42 {
43 	struct mxs_digctl_regs *digctl_regs =
44 		(struct mxs_digctl_regs *)MXS_DIGCTL_BASE;
45 
46 	uint32_t st = readl(&digctl_regs->hw_digctl_microseconds);
47 	st += delay;
48 	while (st > readl(&digctl_regs->hw_digctl_microseconds))
49 		;
50 }
51 
52 #define	MUX_CONFIG_BOOTMODE_PAD	(MXS_PAD_3V3 | MXS_PAD_4MA | MXS_PAD_NOPULL)
53 const iomux_cfg_t iomux_boot[] = {
54 	MX28_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD,
55 	MX28_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD,
56 	MX28_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD,
57 	MX28_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD,
58 	MX28_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD,
59 	MX28_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD,
60 };
61 
62 uint8_t mxs_get_bootmode_index(void)
63 {
64 	uint8_t bootmode = 0;
65 	int i;
66 	uint8_t masked;
67 
68 	/* Setup IOMUX of bootmode pads to GPIO */
69 	mxs_iomux_setup_multiple_pads(iomux_boot, ARRAY_SIZE(iomux_boot));
70 
71 	/* Setup bootmode pins as GPIO input */
72 	gpio_direction_input(MX28_PAD_LCD_D00__GPIO_1_0);
73 	gpio_direction_input(MX28_PAD_LCD_D01__GPIO_1_1);
74 	gpio_direction_input(MX28_PAD_LCD_D02__GPIO_1_2);
75 	gpio_direction_input(MX28_PAD_LCD_D03__GPIO_1_3);
76 	gpio_direction_input(MX28_PAD_LCD_D04__GPIO_1_4);
77 	gpio_direction_input(MX28_PAD_LCD_D05__GPIO_1_5);
78 
79 	/* Read bootmode pads */
80 	bootmode |= (gpio_get_value(MX28_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0;
81 	bootmode |= (gpio_get_value(MX28_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1;
82 	bootmode |= (gpio_get_value(MX28_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2;
83 	bootmode |= (gpio_get_value(MX28_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3;
84 	bootmode |= (gpio_get_value(MX28_PAD_LCD_D04__GPIO_1_4) ? 1 : 0) << 4;
85 	bootmode |= (gpio_get_value(MX28_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5;
86 
87 	for (i = 0; i < ARRAY_SIZE(mxs_boot_modes); i++) {
88 		masked = bootmode & mxs_boot_modes[i].boot_mask;
89 		if (masked == mxs_boot_modes[i].boot_pads)
90 			break;
91 	}
92 
93 	return i;
94 }
95 
96 void mxs_common_spl_init(const iomux_cfg_t *iomux_setup,
97 			const unsigned int iomux_size)
98 {
99 	struct mxs_spl_data *data = (struct mxs_spl_data *)
100 		((CONFIG_SYS_TEXT_BASE - sizeof(struct mxs_spl_data)) & ~0xf);
101 	uint8_t bootmode = mxs_get_bootmode_index();
102 
103 	mxs_iomux_setup_multiple_pads(iomux_setup, iomux_size);
104 	mxs_power_init();
105 
106 	mxs_mem_init();
107 	data->mem_dram_size = mxs_mem_get_size();
108 
109 	data->boot_mode_idx = bootmode;
110 
111 	mxs_power_wait_pswitch();
112 }
113 
114 /* Support aparatus */
115 inline void board_init_f(unsigned long bootflag)
116 {
117 	for (;;)
118 		;
119 }
120 
121 inline void board_init_r(gd_t *id, ulong dest_addr)
122 {
123 	for (;;)
124 		;
125 }
126 
127 void hang(void) __attribute__ ((noreturn));
128 void hang(void)
129 {
130 	for (;;)
131 		;
132 }
133