i.MX28: Implement boot pads sampling and reporting
This patch implements code that samples i.MX28 boot pads and reports boot mode
accordingly.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Detlev Zundel <dzu@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
diff --git a/arch/arm/cpu/arm926ejs/mx28/spl_boot.c b/arch/arm/cpu/arm926ejs/mx28/spl_boot.c
index 37e1eb7..c9b4566 100644
--- a/arch/arm/cpu/arm926ejs/mx28/spl_boot.c
+++ b/arch/arm/cpu/arm926ejs/mx28/spl_boot.c
@@ -29,6 +29,7 @@
#include <asm/arch/iomux-mx28.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/sys_proto.h>
+#include <asm/gpio.h>
#include "mx28_init.h"
@@ -47,11 +48,56 @@
;
}
+#define MUX_CONFIG_BOOTMODE_PAD (MXS_PAD_3V3 | MXS_PAD_4MA | MXS_PAD_NOPULL)
+const iomux_cfg_t iomux_boot[] = {
+ MX28_PAD_LCD_D00__GPIO_1_0 | MUX_CONFIG_BOOTMODE_PAD,
+ MX28_PAD_LCD_D01__GPIO_1_1 | MUX_CONFIG_BOOTMODE_PAD,
+ MX28_PAD_LCD_D02__GPIO_1_2 | MUX_CONFIG_BOOTMODE_PAD,
+ MX28_PAD_LCD_D03__GPIO_1_3 | MUX_CONFIG_BOOTMODE_PAD,
+ MX28_PAD_LCD_D04__GPIO_1_4 | MUX_CONFIG_BOOTMODE_PAD,
+ MX28_PAD_LCD_D05__GPIO_1_5 | MUX_CONFIG_BOOTMODE_PAD,
+};
+
+uint8_t mx28_get_bootmode_index(void)
+{
+ uint8_t bootmode = 0;
+ int i;
+ uint8_t masked;
+
+ /* 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(MX28_PAD_LCD_D00__GPIO_1_0);
+ gpio_direction_input(MX28_PAD_LCD_D01__GPIO_1_1);
+ gpio_direction_input(MX28_PAD_LCD_D02__GPIO_1_2);
+ gpio_direction_input(MX28_PAD_LCD_D03__GPIO_1_3);
+ gpio_direction_input(MX28_PAD_LCD_D04__GPIO_1_4);
+ gpio_direction_input(MX28_PAD_LCD_D05__GPIO_1_5);
+
+ /* Read bootmode pads */
+ bootmode |= (gpio_get_value(MX28_PAD_LCD_D00__GPIO_1_0) ? 1 : 0) << 0;
+ bootmode |= (gpio_get_value(MX28_PAD_LCD_D01__GPIO_1_1) ? 1 : 0) << 1;
+ bootmode |= (gpio_get_value(MX28_PAD_LCD_D02__GPIO_1_2) ? 1 : 0) << 2;
+ bootmode |= (gpio_get_value(MX28_PAD_LCD_D03__GPIO_1_3) ? 1 : 0) << 3;
+ bootmode |= (gpio_get_value(MX28_PAD_LCD_D04__GPIO_1_4) ? 1 : 0) << 4;
+ bootmode |= (gpio_get_value(MX28_PAD_LCD_D05__GPIO_1_5) ? 1 : 0) << 5;
+
+ for (i = 0; i < ARRAY_SIZE(mx28_boot_modes); i++) {
+ masked = bootmode & mx28_boot_modes[i].boot_mask;
+ if (masked == mx28_boot_modes[i].boot_pads)
+ break;
+ }
+
+ return i;
+}
+
void mx28_common_spl_init(const iomux_cfg_t *iomux_setup,
const unsigned int iomux_size)
{
struct mx28_spl_data *data = (struct mx28_spl_data *)
((CONFIG_SYS_TEXT_BASE - sizeof(struct mx28_spl_data)) & ~0xf);
+ uint8_t bootmode = mx28_get_bootmode_index();
mxs_iomux_setup_multiple_pads(iomux_setup, iomux_size);
mx28_power_init();
@@ -59,6 +105,8 @@
mx28_mem_init();
data->mem_dram_size = mx28_mem_get_size();
+ data->boot_mode_idx = bootmode;
+
mx28_power_wait_pswitch();
}