1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Freescale i.MX28 Boot setup
4 *
5 * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
6 * on behalf of DENX Software Engineering GmbH
7 */
8
9 #include <common.h>
10 #include <config.h>
11 #include <asm/io.h>
12 #include <asm/arch/imx-regs.h>
13 #include <asm/arch/sys_proto.h>
14 #include <asm/gpio.h>
15 #include <linux/compiler.h>
16
17 #include "mxs_init.h"
18
19 DECLARE_GLOBAL_DATA_PTR;
20 static gd_t gdata __section(".data");
21 #ifdef CONFIG_SPL_SERIAL_SUPPORT
22 static bd_t bdata __section(".data");
23 #endif
24
25 /*
26 * This delay function is intended to be used only in early stage of boot, where
27 * clock are not set up yet. The timer used here is reset on every boot and
28 * takes a few seconds to roll. The boot doesn't take that long, so to keep the
29 * code simple, it doesn't take rolling into consideration.
30 */
early_delay(int delay)31 void early_delay(int delay)
32 {
33 struct mxs_digctl_regs *digctl_regs =
34 (struct mxs_digctl_regs *)MXS_DIGCTL_BASE;
35
36 uint32_t st = readl(&digctl_regs->hw_digctl_microseconds);
37 st += delay;
38 while (st > readl(&digctl_regs->hw_digctl_microseconds))
39 ;
40 }
41
42 #if defined(CONFIG_MX23)
43 #define MUX_CONFIG_BOOTMODE_PAD (MXS_PAD_3V3 | MXS_PAD_4MA | MXS_PAD_NOPULL)
44 static const iomux_cfg_t iomux_boot[] = {
45 MX23_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD,
46 MX23_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD,
47 MX23_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD,
48 MX23_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD,
49 MX23_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD,
50 MX23_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD,
51 };
52 #endif
53
mxs_get_bootmode_index(void)54 static uint8_t mxs_get_bootmode_index(void)
55 {
56 uint8_t bootmode = 0;
57 int i;
58 uint8_t masked;
59
60 #if defined(CONFIG_MX23)
61 /* Setup IOMUX of bootmode pads to GPIO */
62 mxs_iomux_setup_multiple_pads(iomux_boot, ARRAY_SIZE(iomux_boot));
63
64 /* Setup bootmode pins as GPIO input */
65 gpio_direction_input(MX23_PAD_LCD_D00__GPIO_1_0);
66 gpio_direction_input(MX23_PAD_LCD_D01__GPIO_1_1);
67 gpio_direction_input(MX23_PAD_LCD_D02__GPIO_1_2);
68 gpio_direction_input(MX23_PAD_LCD_D03__GPIO_1_3);
69 gpio_direction_input(MX23_PAD_LCD_D05__GPIO_1_5);
70
71 /* Read bootmode pads */
72 bootmode |= (gpio_get_value(MX23_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0;
73 bootmode |= (gpio_get_value(MX23_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1;
74 bootmode |= (gpio_get_value(MX23_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2;
75 bootmode |= (gpio_get_value(MX23_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3;
76 bootmode |= (gpio_get_value(MX23_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5;
77 #elif defined(CONFIG_MX28)
78 /* The global boot mode will be detected by ROM code and its value
79 * is stored at the fixed address 0x00019BF0 in OCRAM.
80 */
81 #define GLOBAL_BOOT_MODE_ADDR 0x00019BF0
82 bootmode = __raw_readl(GLOBAL_BOOT_MODE_ADDR);
83 #endif
84
85 for (i = 0; i < ARRAY_SIZE(mxs_boot_modes); i++) {
86 masked = bootmode & mxs_boot_modes[i].boot_mask;
87 if (masked == mxs_boot_modes[i].boot_pads)
88 break;
89 }
90
91 return i;
92 }
93
mxs_spl_fixup_vectors(void)94 static void mxs_spl_fixup_vectors(void)
95 {
96 /*
97 * Copy our vector table to 0x0, since due to HAB, we cannot
98 * be loaded to 0x0. We want to have working vectoring though,
99 * thus this fixup. Our vectoring table is PIC, so copying is
100 * fine.
101 */
102 extern uint32_t _start;
103
104 /* cppcheck-suppress nullPointer */
105 memcpy(0x0, &_start, 0x60);
106 }
107
mxs_spl_console_init(void)108 static void mxs_spl_console_init(void)
109 {
110 #ifdef CONFIG_SPL_SERIAL_SUPPORT
111 gd->bd = &bdata;
112 gd->baudrate = CONFIG_BAUDRATE;
113 serial_init();
114 gd->have_console = 1;
115 #endif
116 }
117
mxs_common_spl_init(const uint32_t arg,const uint32_t * resptr,const iomux_cfg_t * iomux_setup,const unsigned int iomux_size)118 void mxs_common_spl_init(const uint32_t arg, const uint32_t *resptr,
119 const iomux_cfg_t *iomux_setup,
120 const unsigned int iomux_size)
121 {
122 struct mxs_spl_data *data = MXS_SPL_DATA;
123 uint8_t bootmode = mxs_get_bootmode_index();
124 gd = &gdata;
125
126 mxs_spl_fixup_vectors();
127
128 mxs_iomux_setup_multiple_pads(iomux_setup, iomux_size);
129
130 mxs_spl_console_init();
131 debug("SPL: Serial Console Initialised\n");
132
133 mxs_power_init();
134
135 mxs_mem_init();
136 data->mem_dram_size = mxs_mem_get_size();
137
138 data->boot_mode_idx = bootmode;
139
140 mxs_power_wait_pswitch();
141
142 if (mxs_boot_modes[data->boot_mode_idx].boot_pads == MXS_BM_JTAG) {
143 debug("SPL: Waiting for JTAG user\n");
144 asm volatile ("x: b x");
145 }
146 }
147
148 #ifndef CONFIG_SPL_FRAMEWORK
149 /* Support aparatus */
board_init_f(unsigned long bootflag)150 inline void board_init_f(unsigned long bootflag)
151 {
152 for (;;)
153 ;
154 }
155
board_init_r(gd_t * id,ulong dest_addr)156 inline void board_init_r(gd_t *id, ulong dest_addr)
157 {
158 for (;;)
159 ;
160 }
161 #endif
162