[U-Boot] [PATCH 05/13] i.MX28: Implement boot pads sampling and reporting
Marek Vasut
marex at denx.de
Tue May 1 23:03:44 CEST 2012
This patch implements code that samples i.MX28 boot pads and reports boot mode
accordingly.
Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Detlev Zundel <dzu at denx.de>
Cc: Fabio Estevam <fabio.estevam at freescale.com>
Cc: Stefano Babic <sbabic at denx.de>
Cc: Wolfgang Denk <wd at denx.de>
---
arch/arm/cpu/arm926ejs/mx28/mx28.c | 4 +++
arch/arm/cpu/arm926ejs/mx28/spl_boot.c | 48 ++++++++++++++++++++++++++++
arch/arm/include/asm/arch-mx28/sys_proto.h | 26 +++++++++++++++
include/configs/m28evk.h | 1 +
include/configs/mx28evk.h | 1 +
5 files changed, 80 insertions(+)
diff --git a/arch/arm/cpu/arm926ejs/mx28/mx28.c b/arch/arm/cpu/arm926ejs/mx28/mx28.c
index 54a68e1..865dbb3 100644
--- a/arch/arm/cpu/arm926ejs/mx28/mx28.c
+++ b/arch/arm/cpu/arm926ejs/mx28/mx28.c
@@ -185,8 +185,12 @@ int arch_cpu_init(void)
#if defined(CONFIG_DISPLAY_CPUINFO)
int print_cpuinfo(void)
{
+ struct mx28_spl_data *data = (struct mx28_spl_data *)
+ ((CONFIG_SYS_TEXT_BASE - sizeof(struct mx28_spl_data)) & ~0xf);
+
printf("Freescale i.MX28 family at %d MHz\n",
mxc_get_clock(MXC_ARM_CLK) / 1000000);
+ printf("BOOT: %s\n", mx28_boot_modes[data->boot_mode_idx].mode);
return 0;
}
#endif
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 @@ void early_delay(int delay)
;
}
+#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 @@ void mx28_common_spl_init(const iomux_cfg_t *iomux_setup,
mx28_mem_init();
data->mem_dram_size = mx28_mem_get_size();
+ data->boot_mode_idx = bootmode;
+
mx28_power_wait_pswitch();
}
diff --git a/arch/arm/include/asm/arch-mx28/sys_proto.h b/arch/arm/include/asm/arch-mx28/sys_proto.h
index 04f2e4d..e701c64 100644
--- a/arch/arm/include/asm/arch-mx28/sys_proto.h
+++ b/arch/arm/include/asm/arch-mx28/sys_proto.h
@@ -39,7 +39,33 @@ void mx28_common_spl_init(const iomux_cfg_t *iomux_setup,
const unsigned int iomux_size);
#endif
+struct mx28_pair {
+ uint8_t boot_pads;
+ uint8_t boot_mask;
+ const char *mode;
+};
+
+static const struct mx28_pair mx28_boot_modes[] = {
+ { 0x00, 0x0f, "USB #0" },
+ { 0x01, 0x1f, "I2C #0, master, 3V3" },
+ { 0x11, 0x1f, "I2C #0, master, 1V8" },
+ { 0x02, 0x1f, "SSP SPI #2, master, 3V3 NOR" },
+ { 0x12, 0x1f, "SSP SPI #2, master, 1V8 NOR" },
+ { 0x03, 0x1f, "SSP SPI #3, master, 3V3 NOR" },
+ { 0x13, 0x1f, "SSP SPI #3, master, 1V8 NOR" },
+ { 0x04, 0x1f, "NAND, 3V3" },
+ { 0x14, 0x1f, "NAND, 1V8" },
+ { 0x08, 0x1f, "SSP SPI #3, master, 3V3 EEPROM" },
+ { 0x18, 0x1f, "SSP SPI #3, master, 1V8 EEPROM" },
+ { 0x09, 0x1f, "SSP SD/MMC #0, 3V3" },
+ { 0x19, 0x1f, "SSP SD/MMC #0, 1V8" },
+ { 0x0a, 0x1f, "SSP SD/MMC #1, 3V3" },
+ { 0x1a, 0x1f, "SSP SD/MMC #1, 1V8" },
+ { 0x00, 0x00, "Reserved/Unknown/Wrong" },
+};
+
struct mx28_spl_data {
+ uint8_t boot_mode_idx;
uint32_t mem_dram_size;
};
diff --git a/include/configs/m28evk.h b/include/configs/m28evk.h
index c40d2a8..12059db 100644
--- a/include/configs/m28evk.h
+++ b/include/configs/m28evk.h
@@ -52,6 +52,7 @@
#define CONFIG_SPL_LDSCRIPT "arch/arm/cpu/arm926ejs/mx28/u-boot-spl.lds"
#define CONFIG_SPL_LIBCOMMON_SUPPORT
#define CONFIG_SPL_LIBGENERIC_SUPPORT
+#define CONFIG_SPL_GPIO_SUPPORT
/*
* U-Boot Commands
diff --git a/include/configs/mx28evk.h b/include/configs/mx28evk.h
index 02f3366..0984d70 100644
--- a/include/configs/mx28evk.h
+++ b/include/configs/mx28evk.h
@@ -46,6 +46,7 @@
#define CONFIG_SPL_LDSCRIPT "arch/arm/cpu/arm926ejs/mx28/u-boot-spl.lds"
#define CONFIG_SPL_LIBCOMMON_SUPPORT
#define CONFIG_SPL_LIBGENERIC_SUPPORT
+#define CONFIG_SPL_GPIO_SUPPORT
/*
* U-Boot Commands
--
1.7.10
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