LXR uboot/arch/arm/cpu/arm926ejs/mxs/spl

   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
  20DECLARE_GLOBAL_DATA_PTR;
  21static gd_t gdata __section(".data");
  22#ifdef CONFIG_SPL_SERIAL_SUPPORT
  23static 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 */
  32void 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)
  44static 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#endif
  53};
  54
  55static uint8_t mxs_get_bootmode_index(void)
  56{
  57        uint8_t bootmode = 0;
  58        int i;
  59        uint8_t masked;
  60
  61#if defined(CONFIG_MX23)
  62        /* Setup IOMUX of bootmode pads to GPIO */
  63        mxs_iomux_setup_multiple_pads(iomux_boot, ARRAY_SIZE(iomux_boot));
  64
  65        /* Setup bootmode pins as GPIO input */
  66        gpio_direction_input(MX23_PAD_LCD_D00__GPIO_1_0);
  67        gpio_direction_input(MX23_PAD_LCD_D01__GPIO_1_1);
  68        gpio_direction_input(MX23_PAD_LCD_D02__GPIO_1_2);
  69        gpio_direction_input(MX23_PAD_LCD_D03__GPIO_1_3);
  70        gpio_direction_input(MX23_PAD_LCD_D05__GPIO_1_5);
  71
  72        /* Read bootmode pads */
  73        bootmode |= (gpio_get_value(MX23_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0;
  74        bootmode |= (gpio_get_value(MX23_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1;
  75        bootmode |= (gpio_get_value(MX23_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2;
  76        bootmode |= (gpio_get_value(MX23_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3;
  77        bootmode |= (gpio_get_value(MX23_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5;
  78#elif defined(CONFIG_MX28)
  79        /* The global boot mode will be detected by ROM code and its value
  80         * is stored at the fixed address 0x00019BF0 in OCRAM.
  81         */
  82#define GLOBAL_BOOT_MODE_ADDR 0x00019BF0
  83        bootmode = __raw_readl(GLOBAL_BOOT_MODE_ADDR);
  84#endif
  85
  86        for (i = 0; i < ARRAY_SIZE(mxs_boot_modes); i++) {
  87                masked = bootmode & mxs_boot_modes[i].boot_mask;
  88                if (masked == mxs_boot_modes[i].boot_pads)
  89                        break;
  90        }
  91
  92        return i;
  93}
  94
  95static void mxs_spl_fixup_vectors(void)
  96{
  97        /*
  98         * Copy our vector table to 0x0, since due to HAB, we cannot
  99         * be loaded to 0x0. We want to have working vectoring though,
 100         * thus this fixup. Our vectoring table is PIC, so copying is
 101         * fine.
 102         */
 103        extern uint32_t _start;
 104
 105        /* cppcheck-suppress nullPointer */
 106        memcpy(0x0, &_start, 0x60);
 107}
 108
 109static void mxs_spl_console_init(void)
 110{
 111#ifdef CONFIG_SPL_SERIAL_SUPPORT
 112        gd->bd = &bdata;
 113        gd->baudrate = CONFIG_BAUDRATE;
 114        serial_init();
 115        gd->have_console = 1;
 116#endif
 117}
 118
 119void mxs_common_spl_init(const uint32_t arg, const uint32_t *resptr,
 120                         const iomux_cfg_t *iomux_setup,
 121                         const unsigned int iomux_size)
 122{
 123        struct mxs_spl_data *data = (struct mxs_spl_data *)
 124                ((CONFIG_SYS_TEXT_BASE - sizeof(struct mxs_spl_data)) & ~0xf);
 125        uint8_t bootmode = mxs_get_bootmode_index();
 126        gd = &gdata;
 127
 128        mxs_spl_fixup_vectors();
 129
 130        mxs_iomux_setup_multiple_pads(iomux_setup, iomux_size);
 131
 132        mxs_spl_console_init();
 133        debug("SPL: Serial Console Initialised\n");
 134
 135        mxs_power_init();
 136
 137        mxs_mem_init();
 138        data->mem_dram_size = mxs_mem_get_size();
 139
 140        data->boot_mode_idx = bootmode;
 141
 142        mxs_power_wait_pswitch();
 143
 144        if (mxs_boot_modes[data->boot_mode_idx].boot_pads == MXS_BM_JTAG) {
 145                debug("SPL: Waiting for JTAG user\n");
 146                asm volatile ("x: b x");
 147        }
 148}
 149
 150/* Support aparatus */
 151inline void board_init_f(unsigned long bootflag)
 152{
 153        for (;;)
 154                ;
 155}
 156
 157inline void board_init_r(gd_t *id, ulong dest_addr)
 158{
 159        for (;;)
 160                ;
 161}
 162