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toradex: colibri_imx7: Enable nand/emmc detection and set boot variant

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Add detection of eMMC vs NAND devices on the Colibri iMX7
board. A GPIO is configured to detect the presence of an on-board resistor
that is configured differently based on the flash memory used. Depending on
the detection result, the 'variant' environment variable is set to '-emmc'
or cleared, indicating the type of storage device.

This enhancement improves variant detection during system initialization
through USB recovery mode, where U-Boot is loaded directly to RAM. This
allows variant detection for an accurate device tree selection.

Signed-off-by: Hiago De Franco <hiago.franco@toradex.com>
Acked-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
This commit is contained in:
Hiago De Franco 2023-10-02 08:57:49 -03:00 committed by Stefano Babic
parent 35fe2ae244
commit 0c39564d02
1 changed files with 24 additions and 0 deletions
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24
board/toradex/colibri_imx7/colibri_imx7.c
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@ -53,6 +53,11 @@ DECLARE_GLOBAL_DATA_PTR;
#define USB_CDET_GPIO IMX_GPIO_NR(7, 14)
#define FLASH_DETECTION_CTRL (PAD_CTL_HYS | PAD_CTL_PUE)
#define FLASH_DET_GPIO IMX_GPIO_NR(6, 11)
static bool is_emmc;
int dram_init(void)
{
gd->ram_size = get_ram_size((void *)PHYS_SDRAM, imx_ddr_size());
@ -60,6 +65,10 @@ int dram_init(void)
return 0;
}
static iomux_v3_cfg_t const flash_detection_pads[] = {
MX7D_PAD_SD3_RESET_B__GPIO6_IO11 | MUX_PAD_CTRL(FLASH_DETECTION_CTRL),
};
static iomux_v3_cfg_t const uart1_pads[] = {
MX7D_PAD_UART1_RX_DATA__UART1_DTE_TX | MUX_PAD_CTRL(UART_PAD_CTRL),
MX7D_PAD_UART1_TX_DATA__UART1_DTE_RX | MUX_PAD_CTRL(UART_PAD_CTRL),
@ -183,6 +192,16 @@ int board_init(void)
/* address of boot parameters */
gd->bd->bi_boot_params = PHYS_SDRAM + 0x100;
/*
* Enable GPIO on NAND_WE_B/eMMC_RST with 100k pull-down. eMMC_RST
* is pulled high with 4.7k for eMMC devices. This allows to reliably
* detect eMMC/NAND flash
*/
imx_iomux_v3_setup_multiple_pads(flash_detection_pads, ARRAY_SIZE(flash_detection_pads));
gpio_request(FLASH_DET_GPIO, "flash-detection-gpio");
is_emmc = gpio_get_value(FLASH_DET_GPIO);
gpio_free(FLASH_DET_GPIO);
#ifdef CONFIG_FEC_MXC
setup_fec();
#endif
@ -348,6 +367,11 @@ int board_late_init(void)
env_set("bootcmd", "sdp 0");
}
#endif
if (is_emmc)
env_set("variant", "-emmc");
else
env_set("variant", "");
return 0;
}
#endif /* CONFIG_BOARD_LATE_INIT */