apalis-imx8: implement pcb version and soc variant handling
Implement PCB version and SoC variant handling which automatically loads
the correct device tree for the Linux kernel.
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Andrejs Cainikovs <andrejs.cainikovs@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Reviewed-by: Fabio Estevam <festevam@denx.de>
diff --git a/board/toradex/apalis-imx8/apalis-imx8.c b/board/toradex/apalis-imx8/apalis-imx8.c
index 4081988..6f28367 100644
--- a/board/toradex/apalis-imx8/apalis-imx8.c
+++ b/board/toradex/apalis-imx8/apalis-imx8.c
@@ -15,10 +15,12 @@
#include <asm/arch/sys_proto.h>
#include <asm/gpio.h>
#include <asm/io.h>
+#include <command.h>
#include <env.h>
#include <errno.h>
-#include <linux/libfdt.h>
#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/libfdt.h>
#include "../common/tdx-cfg-block.h"
@@ -29,11 +31,41 @@
(SC_PAD_28FDSOI_DSE_DV_HIGH << PADRING_DSE_SHIFT) | \
(SC_PAD_28FDSOI_PS_PU << PADRING_PULL_SHIFT))
+#define PCB_VERS_DETECT ((SC_PAD_CONFIG_NORMAL << PADRING_CONFIG_SHIFT) | \
+ (SC_PAD_ISO_OFF << PADRING_LPCONFIG_SHIFT) | \
+ (SC_PAD_28FDSOI_DSE_DV_HIGH << PADRING_DSE_SHIFT) | \
+ (SC_PAD_28FDSOI_PS_PU << PADRING_PULL_SHIFT))
+
+#define GPIO_PAD_CTRL ((SC_PAD_CONFIG_NORMAL << PADRING_CONFIG_SHIFT) | \
+ (SC_PAD_ISO_OFF << PADRING_LPCONFIG_SHIFT) | \
+ (SC_PAD_28FDSOI_DSE_DV_HIGH << PADRING_DSE_SHIFT) | \
+ (SC_PAD_28FDSOI_PS_PU << PADRING_PULL_SHIFT))
+
+#define PCB_VERS_DEFAULT ((SC_PAD_CONFIG_NORMAL << PADRING_CONFIG_SHIFT) | \
+ (SC_PAD_ISO_OFF << PADRING_LPCONFIG_SHIFT) | \
+ (SC_PAD_28FDSOI_PS_PD << PADRING_PULL_SHIFT) | \
+ (SC_PAD_28FDSOI_DSE_DV_HIGH << PADRING_DSE_SHIFT))
+
#define TDX_USER_FUSE_BLOCK1_A 276
#define TDX_USER_FUSE_BLOCK1_B 277
#define TDX_USER_FUSE_BLOCK2_A 278
#define TDX_USER_FUSE_BLOCK2_B 279
+enum pcb_rev_t {
+ PCB_VERSION_1_0,
+ PCB_VERSION_1_1
+};
+
+static iomux_cfg_t pcb_vers_detect[] = {
+ SC_P_MIPI_DSI0_GPIO0_00 | MUX_MODE_ALT(3) | MUX_PAD_CTRL(PCB_VERS_DETECT),
+ SC_P_MIPI_DSI0_GPIO0_01 | MUX_MODE_ALT(3) | MUX_PAD_CTRL(PCB_VERS_DETECT),
+};
+
+static iomux_cfg_t pcb_vers_default[] = {
+ SC_P_MIPI_DSI0_GPIO0_00 | MUX_MODE_ALT(3) | MUX_PAD_CTRL(PCB_VERS_DEFAULT),
+ SC_P_MIPI_DSI0_GPIO0_01 | MUX_MODE_ALT(3) | MUX_PAD_CTRL(PCB_VERS_DEFAULT),
+};
+
static iomux_cfg_t uart1_pads[] = {
SC_P_UART1_RX | MUX_PAD_CTRL(UART_PAD_CTRL),
SC_P_UART1_TX | MUX_PAD_CTRL(UART_PAD_CTRL),
@@ -180,6 +212,75 @@
return 0;
}
+static enum pcb_rev_t get_pcb_revision(void)
+{
+ unsigned int pcb_vers = 0;
+
+ imx8_iomux_setup_multiple_pads(pcb_vers_detect,
+ ARRAY_SIZE(pcb_vers_detect));
+
+ gpio_request(IMX_GPIO_NR(1, 18),
+ "PCB version detection on PAD SC_P_MIPI_DSI0_GPIO0_00");
+ gpio_request(IMX_GPIO_NR(1, 19),
+ "PCB version detection on PAD SC_P_MIPI_DSI0_GPIO0_01");
+ gpio_direction_input(IMX_GPIO_NR(1, 18));
+ gpio_direction_input(IMX_GPIO_NR(1, 19));
+
+ udelay(1000);
+
+ pcb_vers = gpio_get_value(IMX_GPIO_NR(1, 18));
+ pcb_vers |= gpio_get_value(IMX_GPIO_NR(1, 19)) << 1;
+
+ /* Set muxing back to default values for saving energy */
+ imx8_iomux_setup_multiple_pads(pcb_vers_default,
+ ARRAY_SIZE(pcb_vers_default));
+
+ switch (pcb_vers) {
+ case 0b11:
+ return PCB_VERSION_1_0;
+ case 0b10:
+ return PCB_VERSION_1_1;
+ default:
+ printf("Unknown PCB version=0x%x, default to V1.1\n", pcb_vers);
+ return PCB_VERSION_1_1;
+ }
+}
+
+static void select_dt_from_module_version(void)
+{
+ env_set("soc", "imx8qm");
+ env_set("variant", "-v1.1");
+
+ switch (tdx_hw_tag.prodid) {
+ /* Select Apalis iMX8QM device trees */
+ case APALIS_IMX8QM_IT:
+ case APALIS_IMX8QM_WIFI_BT_IT:
+ case APALIS_IMX8QM_8GB_WIFI_BT_IT:
+ if (get_pcb_revision() == PCB_VERSION_1_0)
+ env_set("variant", "");
+ break;
+ /* Select Apalis iMX8QP device trees */
+ case APALIS_IMX8QP_WIFI_BT:
+ case APALIS_IMX8QP:
+ env_set("soc", "imx8qp");
+ break;
+ default:
+ printf("Unknown Apalis iMX8 module\n");
+ return;
+ }
+}
+
+static int do_select_dt_from_module_version(struct cmd_tbl *cmdtp, int flag,
+ int argc, char * const argv[])
+{
+ select_dt_from_module_version();
+ return 0;
+}
+
+U_BOOT_CMD(select_dt_from_module_version, CONFIG_SYS_MAXARGS, 1, do_select_dt_from_module_version,
+ "\n", " - select devicetree from module version"
+);
+
int board_init(void)
{
board_gpio_init();
@@ -215,5 +316,7 @@
env_set("board_rev", "v1.0");
#endif
+ select_dt_from_module_version();
+
return 0;
}