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Diffstat (limited to 'roms/u-boot/arch/x86/cpu/slimbootloader/serial.c')
-rw-r--r--roms/u-boot/arch/x86/cpu/slimbootloader/serial.c66
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,
+};