1 files changed, 84 insertions, 0 deletions
diff --git a/arch/arm/boards/variscite-dt8mcustomboard-imx8mp/board.c b/arch/arm/boards/variscite-dt8mcustomboard-imx8mp/board.c
new file mode 100644
index 0000000000..154931d534
--- /dev/null
+++ b/arch/arm/boards/variscite-dt8mcustomboard-imx8mp/board.c
@@ -0,0 +1,84 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2023 Michael Kopfensteiner, VAHLE Automation GmbH
+ */
+
+#include <asm/memory.h>
+#include <bootsource.h>
+#include <common.h>
+#include <deep-probe.h>
+#include <init.h>
+#include <linux/phy.h>
+#include <linux/sizes.h>
+#include <mach/imx/bbu.h>
+#include <mach/imx/iomux-mx8mp.h>
+#include <gpio.h>
+#include <envfs.h>
+
+#define PHY_ID_ADIN1300		0x0283bc30
+#define PHY_ID_MODEL_MASK	0xfffffff0
+
+/*
+ * This fixup is necessary to properly configure the ADIN1300
+ * PHY on the SOM to properly communicate using RGMII.
+ * This fixup disables the PHY's internal 2ns RGMII receive clock
+ * delay. Without this configuration change, the system will
+ * be able to send Ethernet packages, but the MAC won't receive
+ * any response packages.
+ *
+ * This fixup is specific to the ADIN1300 PHY. This implementation
+ * was ported from Variscite's U-Boot sources.
+ */
+static int phy_fixup_adin1300(struct phy_device *dev) {
+	int ret;
+
+	pr_debug("BOARD: applying PHY fixup for ADIN1300\n");
+
+	ret = mdiobus_write(dev->bus, dev->addr, 0x0010, 0xFF23);
+	if (ret) {
+		pr_warn("ADIN1300 PHY fixup: failed to write EXT_REG_PTR\n");
+		return ret;
+	}
+
+	ret = mdiobus_write(dev->bus, dev->addr, 0x0011, 0x0E01);
+	if (ret)  {
+		pr_warn("ADIN1300 PHY fixup: failed to write EXT_REG_DATA\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int var_imx8mp_dart_cb_probe(struct device *dev)
+{
+	int emmc_bbu_flag = 0;
+	int sd_bbu_flag = 0;
+
+	phy_register_fixup_for_uid(PHY_ID_ADIN1300, PHY_ID_MODEL_MASK, phy_fixup_adin1300);
+
+	if (bootsource_get() == BOOTSOURCE_MMC && bootsource_get_instance() == 1) {
+		of_device_enable_path("/chosen/environment-sd");
+		sd_bbu_flag = BBU_HANDLER_FLAG_DEFAULT;
+	} else {
+		of_device_enable_path("/chosen/environment-emmc");
+		emmc_bbu_flag = BBU_HANDLER_FLAG_DEFAULT;
+	}
+
+	imx8m_bbu_internal_mmc_register_handler("SD", "/dev/mmc1.barebox", sd_bbu_flag);
+	imx8m_bbu_internal_mmcboot_register_handler("eMMC", "/dev/mmc2", emmc_bbu_flag);
+
+	return 0;
+}
+
+static const struct of_device_id var_imx8mp_dart_cb_of_match[] = {
+	{ .compatible = "variscite,imx8mp-var-dart" },
+	{ /* Sentinel */ }
+};
+BAREBOX_DEEP_PROBE_ENABLE(var_imx8mp_dart_cb_of_match);
+
+static struct driver var_imx8mp_dart_cb_board_driver = {
+	.name = "board-var-imx8mp-dart-cb",
+	.probe = var_imx8mp_dart_cb_probe,
+	.of_compatible = var_imx8mp_dart_cb_of_match,
+};
+coredevice_platform_driver(var_imx8mp_dart_cb_board_driver);