mirror of
https://github.com/smaeul/u-boot.git
synced 2025-10-20 07:38:14 +01:00
712aa6e24c
The MXS starts with CPSR V bit set, which makes the CPU jump to high vectors in case of an exception. Those high vectors are located at 0xffff0000, which is where the BootROM exception table is located as well. U-Boot should handle exceptions on its own using its own exception handling code, which is located at 0x0, i.e. at low vectors. Clear the CPSR V bit, so that the CPU would jump to low vectors on exception instead, and therefore run the U-Boot exception handling code. Signed-off-by: Marek Vasut <marex@denx.de> Reviewed-by: Fabio Estevam <festevam@gmail.com>
171 lines
4.3 KiB
C
171 lines
4.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Freescale i.MX28 Boot setup
|
|
*
|
|
* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
|
|
* on behalf of DENX Software Engineering GmbH
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <config.h>
|
|
#include <init.h>
|
|
#include <log.h>
|
|
#include <serial.h>
|
|
#include <asm/global_data.h>
|
|
#include <asm/io.h>
|
|
#include <asm/arch/imx-regs.h>
|
|
#include <asm/arch/sys_proto.h>
|
|
#include <asm/gpio.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/system.h>
|
|
#include <linux/compiler.h>
|
|
|
|
#include "mxs_init.h"
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
static gd_t gdata __section(".data");
|
|
#ifdef CONFIG_SPL_SERIAL
|
|
static struct bd_info bdata __section(".data");
|
|
#endif
|
|
|
|
/*
|
|
* This delay function is intended to be used only in early stage of boot, where
|
|
* clock are not set up yet.
|
|
*/
|
|
void early_delay(int delay)
|
|
{
|
|
struct mxs_digctl_regs *digctl_regs =
|
|
(struct mxs_digctl_regs *)MXS_DIGCTL_BASE;
|
|
|
|
uint32_t st = readl(&digctl_regs->hw_digctl_microseconds);
|
|
while (readl(&digctl_regs->hw_digctl_microseconds) - st <= delay)
|
|
;
|
|
}
|
|
|
|
#if defined(CONFIG_MX23)
|
|
#define MUX_CONFIG_BOOTMODE_PAD (MXS_PAD_3V3 | MXS_PAD_4MA | MXS_PAD_NOPULL)
|
|
static const iomux_cfg_t iomux_boot[] = {
|
|
MX23_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD,
|
|
MX23_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD,
|
|
MX23_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD,
|
|
MX23_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD,
|
|
MX23_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD,
|
|
MX23_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD,
|
|
};
|
|
#endif
|
|
|
|
static uint8_t mxs_get_bootmode_index(void)
|
|
{
|
|
uint8_t bootmode = 0;
|
|
int i;
|
|
uint8_t masked;
|
|
|
|
#if defined(CONFIG_MX23)
|
|
/* Setup IOMUX of bootmode pads to GPIO */
|
|
mxs_iomux_setup_multiple_pads(iomux_boot, ARRAY_SIZE(iomux_boot));
|
|
|
|
/* Setup bootmode pins as GPIO input */
|
|
gpio_direction_input(MX23_PAD_LCD_D00__GPIO_1_0);
|
|
gpio_direction_input(MX23_PAD_LCD_D01__GPIO_1_1);
|
|
gpio_direction_input(MX23_PAD_LCD_D02__GPIO_1_2);
|
|
gpio_direction_input(MX23_PAD_LCD_D03__GPIO_1_3);
|
|
gpio_direction_input(MX23_PAD_LCD_D05__GPIO_1_5);
|
|
|
|
/* Read bootmode pads */
|
|
bootmode |= (gpio_get_value(MX23_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0;
|
|
bootmode |= (gpio_get_value(MX23_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1;
|
|
bootmode |= (gpio_get_value(MX23_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2;
|
|
bootmode |= (gpio_get_value(MX23_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3;
|
|
bootmode |= (gpio_get_value(MX23_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5;
|
|
#elif defined(CONFIG_MX28)
|
|
/* The global boot mode will be detected by ROM code and its value
|
|
* is stored at the fixed address 0x00019BF0 in OCRAM.
|
|
*/
|
|
#define GLOBAL_BOOT_MODE_ADDR 0x00019BF0
|
|
bootmode = __raw_readl(GLOBAL_BOOT_MODE_ADDR);
|
|
#endif
|
|
|
|
for (i = 0; i < ARRAY_SIZE(mxs_boot_modes); i++) {
|
|
masked = bootmode & mxs_boot_modes[i].boot_mask;
|
|
if (masked == mxs_boot_modes[i].boot_pads)
|
|
break;
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
static noinline
|
|
__attribute__((target("arm")))
|
|
void mxs_spl_fixup_vectors(void)
|
|
{
|
|
/*
|
|
* Copy our vector table to 0x0, since due to HAB, we cannot
|
|
* be loaded to 0x0. We want to have working vectoring though,
|
|
* thus this fixup. Our vectoring table is PIC, so copying is
|
|
* fine.
|
|
*/
|
|
|
|
/* cppcheck-suppress nullPointer */
|
|
memcpy(0x0, _start, 0x60);
|
|
|
|
/* Make sure ARM core points to low vectors */
|
|
set_cr(get_cr() & ~CR_V);
|
|
}
|
|
|
|
static void mxs_spl_console_init(void)
|
|
{
|
|
#ifdef CONFIG_SPL_SERIAL
|
|
gd->bd = &bdata;
|
|
gd->baudrate = CONFIG_BAUDRATE;
|
|
serial_init();
|
|
gd->have_console = 1;
|
|
#endif
|
|
}
|
|
|
|
void mxs_common_spl_init(const uint32_t arg, const uint32_t *resptr,
|
|
const iomux_cfg_t *iomux_setup,
|
|
const unsigned int iomux_size)
|
|
{
|
|
struct mxs_spl_data *data = MXS_SPL_DATA;
|
|
uint8_t bootmode = mxs_get_bootmode_index();
|
|
set_gd(&gdata);
|
|
|
|
mxs_spl_fixup_vectors();
|
|
|
|
mxs_iomux_setup_multiple_pads(iomux_setup, iomux_size);
|
|
|
|
if (!CONFIG_IS_ENABLED(DM_SERIAL)) {
|
|
mxs_spl_console_init();
|
|
debug("SPL: Serial Console Initialised\n");
|
|
}
|
|
|
|
mxs_power_init();
|
|
|
|
mxs_mem_init();
|
|
data->mem_dram_size = mxs_mem_get_size();
|
|
|
|
data->boot_mode_idx = bootmode;
|
|
|
|
mxs_power_wait_pswitch();
|
|
|
|
if (mxs_boot_modes[data->boot_mode_idx].boot_pads == MXS_BM_JTAG) {
|
|
debug("SPL: Waiting for JTAG user\n");
|
|
asm volatile ("x: b x");
|
|
}
|
|
}
|
|
|
|
#ifndef CONFIG_SPL_FRAMEWORK
|
|
/* Support aparatus */
|
|
inline void board_init_f(unsigned long bootflag)
|
|
{
|
|
for (;;)
|
|
;
|
|
}
|
|
|
|
inline void board_init_r(gd_t *id, ulong dest_addr)
|
|
{
|
|
for (;;)
|
|
;
|
|
}
|
|
#endif
|