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 static const iomux_cfg_t iomux_boot[] = {
54 #if defined(CONFIG_MX23)
55 	MX23_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD,
56 	MX23_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD,
57 	MX23_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD,
58 	MX23_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD,
59 	MX23_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD,
60 	MX23_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD,
61 #elif defined(CONFIG_MX28)
62 	MX28_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD,
63 	MX28_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD,
64 	MX28_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD,
65 	MX28_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD,
66 	MX28_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD,
67 	MX28_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD,
68 #endif
69 };
70 
71 static uint8_t mxs_get_bootmode_index(void)
72 {
73 	uint8_t bootmode = 0;
74 	int i;
75 	uint8_t masked;
76 
77 	/* Setup IOMUX of bootmode pads to GPIO */
78 	mxs_iomux_setup_multiple_pads(iomux_boot, ARRAY_SIZE(iomux_boot));
79 
80 #if defined(CONFIG_MX23)
81 	/* Setup bootmode pins as GPIO input */
82 	gpio_direction_input(MX23_PAD_LCD_D00__GPIO_1_0);
83 	gpio_direction_input(MX23_PAD_LCD_D01__GPIO_1_1);
84 	gpio_direction_input(MX23_PAD_LCD_D02__GPIO_1_2);
85 	gpio_direction_input(MX23_PAD_LCD_D03__GPIO_1_3);
86 	gpio_direction_input(MX23_PAD_LCD_D05__GPIO_1_5);
87 
88 	/* Read bootmode pads */
89 	bootmode |= (gpio_get_value(MX23_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0;
90 	bootmode |= (gpio_get_value(MX23_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1;
91 	bootmode |= (gpio_get_value(MX23_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2;
92 	bootmode |= (gpio_get_value(MX23_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3;
93 	bootmode |= (gpio_get_value(MX23_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5;
94 #elif defined(CONFIG_MX28)
95 	/* Setup bootmode pins as GPIO input */
96 	gpio_direction_input(MX28_PAD_LCD_D00__GPIO_1_0);
97 	gpio_direction_input(MX28_PAD_LCD_D01__GPIO_1_1);
98 	gpio_direction_input(MX28_PAD_LCD_D02__GPIO_1_2);
99 	gpio_direction_input(MX28_PAD_LCD_D03__GPIO_1_3);
100 	gpio_direction_input(MX28_PAD_LCD_D04__GPIO_1_4);
101 	gpio_direction_input(MX28_PAD_LCD_D05__GPIO_1_5);
102 
103 	/* Read bootmode pads */
104 	bootmode |= (gpio_get_value(MX28_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0;
105 	bootmode |= (gpio_get_value(MX28_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1;
106 	bootmode |= (gpio_get_value(MX28_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2;
107 	bootmode |= (gpio_get_value(MX28_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3;
108 	bootmode |= (gpio_get_value(MX28_PAD_LCD_D04__GPIO_1_4) ? 1 : 0) << 4;
109 	bootmode |= (gpio_get_value(MX28_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5;
110 #endif
111 
112 	for (i = 0; i < ARRAY_SIZE(mxs_boot_modes); i++) {
113 		masked = bootmode & mxs_boot_modes[i].boot_mask;
114 		if (masked == mxs_boot_modes[i].boot_pads)
115 			break;
116 	}
117 
118 	return i;
119 }
120 
121 void mxs_common_spl_init(const iomux_cfg_t *iomux_setup,
122 			const unsigned int iomux_size)
123 {
124 	struct mxs_spl_data *data = (struct mxs_spl_data *)
125 		((CONFIG_SYS_TEXT_BASE - sizeof(struct mxs_spl_data)) & ~0xf);
126 	uint8_t bootmode = mxs_get_bootmode_index();
127 
128 	mxs_iomux_setup_multiple_pads(iomux_setup, iomux_size);
129 	mxs_power_init();
130 
131 	mxs_mem_init();
132 	data->mem_dram_size = mxs_mem_get_size();
133 
134 	data->boot_mode_idx = bootmode;
135 
136 	mxs_power_wait_pswitch();
137 }
138 
139 /* Support aparatus */
140 inline void board_init_f(unsigned long bootflag)
141 {
142 	for (;;)
143 		;
144 }
145 
146 inline void board_init_r(gd_t *id, ulong dest_addr)
147 {
148 	for (;;)
149 		;
150 }
151 
152 void hang(void) __attribute__ ((noreturn));
153 void hang(void)
154 {
155 	for (;;)
156 		;
157 }
158