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

   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  */
  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
  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
  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
 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
 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 */
 150 inline void board_init_f(unsigned long bootflag)
 151 {
 152         for (;;)
 153                 ;
 154 }
 155
 156 inline void board_init_r(gd_t *id, ulong dest_addr)
 157 {
 158         for (;;)
 159                 ;
 160 }
 161 #endif