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
  17 #include "mxs_init.h"
  18
  19 /*
  20  * This delay function is intended to be used only in early stage of boot, where
  21  * clock are not set up yet. The timer used here is reset on every boot and
  22  * takes a few seconds to roll. The boot doesn't take that long, so to keep the
  23  * code simple, it doesn't take rolling into consideration.
  24  */
  25 void early_delay(int delay)
  26 {
  27         struct mxs_digctl_regs *digctl_regs =
  28                 (struct mxs_digctl_regs *)MXS_DIGCTL_BASE;
  29
  30         uint32_t st = readl(&digctl_regs->hw_digctl_microseconds);
  31         st += delay;
  32         while (st > readl(&digctl_regs->hw_digctl_microseconds))
  33                 ;
  34 }
  35
  36 #define MUX_CONFIG_BOOTMODE_PAD (MXS_PAD_3V3 | MXS_PAD_4MA | MXS_PAD_NOPULL)
  37 static const iomux_cfg_t iomux_boot[] = {
  38 #if defined(CONFIG_MX23)
  39         MX23_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD,
  40         MX23_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD,
  41         MX23_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD,
  42         MX23_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD,
  43         MX23_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD,
  44         MX23_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD,
  45 #elif defined(CONFIG_MX28)
  46         MX28_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD,
  47         MX28_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD,
  48         MX28_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD,
  49         MX28_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD,
  50         MX28_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD,
  51         MX28_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD,
  52 #endif
  53 };
  54
  55 static uint8_t mxs_get_bootmode_index(void)
  56 {
  57         uint8_t bootmode = 0;
  58         int i;
  59         uint8_t masked;
  60
  61         /* Setup IOMUX of bootmode pads to GPIO */
  62         mxs_iomux_setup_multiple_pads(iomux_boot, ARRAY_SIZE(iomux_boot));
  63
  64 #if defined(CONFIG_MX23)
  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         /* Setup bootmode pins as GPIO input */
  80         gpio_direction_input(MX28_PAD_LCD_D00__GPIO_1_0);
  81         gpio_direction_input(MX28_PAD_LCD_D01__GPIO_1_1);
  82         gpio_direction_input(MX28_PAD_LCD_D02__GPIO_1_2);
  83         gpio_direction_input(MX28_PAD_LCD_D03__GPIO_1_3);
  84         gpio_direction_input(MX28_PAD_LCD_D04__GPIO_1_4);
  85         gpio_direction_input(MX28_PAD_LCD_D05__GPIO_1_5);
  86
  87         /* Read bootmode pads */
  88         bootmode |= (gpio_get_value(MX28_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0;
  89         bootmode |= (gpio_get_value(MX28_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1;
  90         bootmode |= (gpio_get_value(MX28_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2;
  91         bootmode |= (gpio_get_value(MX28_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3;
  92         bootmode |= (gpio_get_value(MX28_PAD_LCD_D04__GPIO_1_4) ? 1 : 0) << 4;
  93         bootmode |= (gpio_get_value(MX28_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5;
  94 #endif
  95
  96         for (i = 0; i < ARRAY_SIZE(mxs_boot_modes); i++) {
  97                 masked = bootmode & mxs_boot_modes[i].boot_mask;
  98                 if (masked == mxs_boot_modes[i].boot_pads)
  99                         break;
 100         }
 101
 102         return i;
 103 }
 104
 105 void mxs_common_spl_init(const iomux_cfg_t *iomux_setup,
 106                         const unsigned int iomux_size)
 107 {
 108         struct mxs_spl_data *data = (struct mxs_spl_data *)
 109                 ((CONFIG_SYS_TEXT_BASE - sizeof(struct mxs_spl_data)) & ~0xf);
 110         uint8_t bootmode = mxs_get_bootmode_index();
 111
 112         mxs_iomux_setup_multiple_pads(iomux_setup, iomux_size);
 113         mxs_power_init();
 114
 115         mxs_mem_init();
 116         data->mem_dram_size = mxs_mem_get_size();
 117
 118         data->boot_mode_idx = bootmode;
 119
 120         mxs_power_wait_pswitch();
 121 }
 122
 123 /* Support aparatus */
 124 inline void board_init_f(unsigned long bootflag)
 125 {
 126         for (;;)
 127                 ;
 128 }
 129
 130 inline void board_init_r(gd_t *id, ulong dest_addr)
 131 {
 132         for (;;)
 133                 ;
 134 }