arch/arm/cpu/arm926ejs/mxs/spl_boot.c

   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  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <common.h>
  11 #include <config.h>
  12 #include <asm/io.h>
  13 #include <asm/arch/imx-regs.h>
  14 #include <asm/arch/sys_proto.h>
  15 #include <asm/gpio.h>
  16 #include <linux/compiler.h>
  17
  18 #include "mxs_init.h"
  19
  20 DECLARE_GLOBAL_DATA_PTR;
  21 static gd_t gdata __section(".data");
  22 #ifdef CONFIG_SPL_SERIAL_SUPPORT
  23 static bd_t bdata __section(".data");
  24 #endif
  25
  26 /*
  27  * This delay function is intended to be used only in early stage of boot, where
  28  * clock are not set up yet. The timer used here is reset on every boot and
  29  * takes a few seconds to roll. The boot doesn't take that long, so to keep the
  30  * code simple, it doesn't take rolling into consideration.
  31  */
  32 void early_delay(int delay)
  33 {
  34         struct mxs_digctl_regs *digctl_regs =
  35                 (struct mxs_digctl_regs *)MXS_DIGCTL_BASE;
  36
  37         uint32_t st = readl(&digctl_regs->hw_digctl_microseconds);
  38         st += delay;
  39         while (st > readl(&digctl_regs->hw_digctl_microseconds))
  40                 ;
  41 }
  42
  43 #define MUX_CONFIG_BOOTMODE_PAD (MXS_PAD_3V3 | MXS_PAD_4MA | MXS_PAD_NOPULL)
  44 static const iomux_cfg_t iomux_boot[] = {
  45 #if defined(CONFIG_MX23)
  46         MX23_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD,
  47         MX23_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD,
  48         MX23_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD,
  49         MX23_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD,
  50         MX23_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD,
  51         MX23_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD,
  52 #elif defined(CONFIG_MX28)
  53         MX28_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD,
  54         MX28_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD,
  55         MX28_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD,
  56         MX28_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD,
  57         MX28_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD,
  58         MX28_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD,
  59 #endif
  60 };
  61
  62 static 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 #if defined(CONFIG_MX23)
  72         /* Setup bootmode pins as GPIO input */
  73         gpio_direction_input(MX23_PAD_LCD_D00__GPIO_1_0);
  74         gpio_direction_input(MX23_PAD_LCD_D01__GPIO_1_1);
  75         gpio_direction_input(MX23_PAD_LCD_D02__GPIO_1_2);
  76         gpio_direction_input(MX23_PAD_LCD_D03__GPIO_1_3);
  77         gpio_direction_input(MX23_PAD_LCD_D05__GPIO_1_5);
  78
  79         /* Read bootmode pads */
  80         bootmode |= (gpio_get_value(MX23_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0;
  81         bootmode |= (gpio_get_value(MX23_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1;
  82         bootmode |= (gpio_get_value(MX23_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2;
  83         bootmode |= (gpio_get_value(MX23_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3;
  84         bootmode |= (gpio_get_value(MX23_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5;
  85 #elif defined(CONFIG_MX28)
  86         /* Setup bootmode pins as GPIO input */
  87         gpio_direction_input(MX28_PAD_LCD_D00__GPIO_1_0);
  88         gpio_direction_input(MX28_PAD_LCD_D01__GPIO_1_1);
  89         gpio_direction_input(MX28_PAD_LCD_D02__GPIO_1_2);
  90         gpio_direction_input(MX28_PAD_LCD_D03__GPIO_1_3);
  91         gpio_direction_input(MX28_PAD_LCD_D04__GPIO_1_4);
  92         gpio_direction_input(MX28_PAD_LCD_D05__GPIO_1_5);
  93
  94         /* Read bootmode pads */
  95         bootmode |= (gpio_get_value(MX28_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0;
  96         bootmode |= (gpio_get_value(MX28_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1;
  97         bootmode |= (gpio_get_value(MX28_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2;
  98         bootmode |= (gpio_get_value(MX28_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3;
  99         bootmode |= (gpio_get_value(MX28_PAD_LCD_D04__GPIO_1_4) ? 1 : 0) << 4;
 100         bootmode |= (gpio_get_value(MX28_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5;
 101 #endif
 102
 103         for (i = 0; i < ARRAY_SIZE(mxs_boot_modes); i++) {
 104                 masked = bootmode & mxs_boot_modes[i].boot_mask;
 105                 if (masked == mxs_boot_modes[i].boot_pads)
 106                         break;
 107         }
 108
 109         return i;
 110 }
 111
 112 static void mxs_spl_fixup_vectors(void)
 113 {
 114         /*
 115          * Copy our vector table to 0x0, since due to HAB, we cannot
 116          * be loaded to 0x0. We want to have working vectoring though,
 117          * thus this fixup. Our vectoring table is PIC, so copying is
 118          * fine.
 119          */
 120         extern uint32_t _start;
 121
 122         /* cppcheck-suppress nullPointer */
 123         memcpy(0x0, &_start, 0x60);
 124 }
 125
 126 static void mxs_spl_console_init(void)
 127 {
 128 #ifdef CONFIG_SPL_SERIAL_SUPPORT
 129         gd->bd = &bdata;
 130         gd->baudrate = CONFIG_BAUDRATE;
 131         serial_init();
 132         gd->have_console = 1;
 133 #endif
 134 }
 135
 136 void mxs_common_spl_init(const uint32_t arg, const uint32_t *resptr,
 137                          const iomux_cfg_t *iomux_setup,
 138                          const unsigned int iomux_size)
 139 {
 140         struct mxs_spl_data *data = (struct mxs_spl_data *)
 141                 ((CONFIG_SYS_TEXT_BASE - sizeof(struct mxs_spl_data)) & ~0xf);
 142         uint8_t bootmode = mxs_get_bootmode_index();
 143         gd = &gdata;
 144
 145         mxs_spl_fixup_vectors();
 146
 147         mxs_iomux_setup_multiple_pads(iomux_setup, iomux_size);
 148
 149         mxs_spl_console_init();
 150
 151         mxs_power_init();
 152
 153         mxs_mem_init();
 154         data->mem_dram_size = mxs_mem_get_size();
 155
 156         data->boot_mode_idx = bootmode;
 157
 158         mxs_power_wait_pswitch();
 159 }
 160
 161 /* Support aparatus */
 162 inline void board_init_f(unsigned long bootflag)
 163 {
 164         for (;;)
 165                 ;
 166 }
 167
 168 inline void board_init_r(gd_t *id, ulong dest_addr)
 169 {
 170         for (;;)
 171                 ;
 172 }