1 files changed, 66 insertions, 0 deletions
diff --git a/roms/u-boot/arch/x86/cpu/slimbootloader/serial.c b/roms/u-boot/arch/x86/cpu/slimbootloader/serial.c
new file mode 100644
index 000000000..d28b28089
--- /dev/null
+++ b/roms/u-boot/arch/x86/cpu/slimbootloader/serial.c
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2019 Intel Corporation <www.intel.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <log.h>
+#include <ns16550.h>
+#include <serial.h>
+#include <asm/arch/slimbootloader.h>
+#include <asm/global_data.h>
+
+/**
+ * The serial port info hob is generated by Slim Bootloader, so eligible for
+ * Slim Bootloader based boards only.
+ */
+static int slimbootloader_serial_of_to_plat(struct udevice *dev)
+{
+	const efi_guid_t guid = SBL_SERIAL_PORT_INFO_GUID;
+	struct sbl_serial_port_info *data;
+	struct ns16550_plat *plat = dev_get_plat(dev);
+
+	if (!gd->arch.hob_list)
+		panic("hob list not found!");
+
+	data = hob_get_guid_hob_data(gd->arch.hob_list, NULL, &guid);
+	if (!data) {
+		debug("failed to get serial port information\n");
+		return -ENOENT;
+	}
+	debug("type:%d base=0x%08x baudrate=%d stride=%d clk=%d\n",
+	      data->type,
+	      data->base,
+	      data->baud,
+	      data->stride,
+	      data->clk);
+
+	plat->base = data->base;
+	/* ns16550 uses reg_shift, then covert stride to shift */
+	plat->reg_shift = data->stride >> 1;
+	plat->reg_width = data->stride;
+	plat->clock = data->clk;
+	plat->fcr = UART_FCR_DEFVAL;
+	plat->flags = 0;
+	if (data->type == 1)
+		plat->flags |= NS16550_FLAG_IO;
+
+	return 0;
+}
+
+static const struct udevice_id slimbootloader_serial_ids[] = {
+	{ .compatible = "intel,slimbootloader-uart" },
+	{}
+};
+
+U_BOOT_DRIVER(serial_slimbootloader) = {
+	.name	= "serial_slimbootloader",
+	.id	= UCLASS_SERIAL,
+	.of_match = slimbootloader_serial_ids,
+	.of_to_plat = slimbootloader_serial_of_to_plat,
+	.plat_auto	= sizeof(struct ns16550_plat),
+	.priv_auto	= sizeof(struct ns16550),
+	.probe	= ns16550_serial_probe,
+	.ops	= &ns16550_serial_ops,
+};