1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2019 Intel Corporation <www.intel.com>
4 */
5
6#include <common.h>
7#include <dm.h>
8#include <log.h>
9#include <ns16550.h>
10#include <serial.h>
11#include <asm/arch/slimbootloader.h>
12#include <asm/global_data.h>
13
14/**
15 * The serial port info hob is generated by Slim Bootloader, so eligible for
16 * Slim Bootloader based boards only.
17 */
18static int slimbootloader_serial_of_to_plat(struct udevice *dev)
19{
20	const efi_guid_t guid = SBL_SERIAL_PORT_INFO_GUID;
21	struct sbl_serial_port_info *data;
22	struct ns16550_plat *plat = dev_get_plat(dev);
23
24	if (!gd->arch.hob_list)
25		panic("hob list not found!");
26
27	data = hob_get_guid_hob_data(gd->arch.hob_list, NULL, &guid);
28	if (!data) {
29		debug("failed to get serial port information\n");
30		return -ENOENT;
31	}
32	debug("type:%d base=0x%08x baudrate=%d stride=%d clk=%d\n",
33	      data->type,
34	      data->base,
35	      data->baud,
36	      data->stride,
37	      data->clk);
38
39	plat->base = data->base;
40	/* ns16550 uses reg_shift, then covert stride to shift */
41	plat->reg_shift = data->stride >> 1;
42	plat->reg_width = data->stride;
43	plat->clock = data->clk;
44	plat->fcr = UART_FCR_DEFVAL;
45	plat->flags = 0;
46	if (data->type == 1)
47		plat->flags |= NS16550_FLAG_IO;
48
49	return 0;
50}
51
52static const struct udevice_id slimbootloader_serial_ids[] = {
53	{ .compatible = "intel,slimbootloader-uart" },
54	{}
55};
56
57U_BOOT_DRIVER(serial_slimbootloader) = {
58	.name	= "serial_slimbootloader",
59	.id	= UCLASS_SERIAL,
60	.of_match = slimbootloader_serial_ids,
61	.of_to_plat = slimbootloader_serial_of_to_plat,
62	.plat_auto	= sizeof(struct ns16550_plat),
63	.priv_auto	= sizeof(struct ns16550),
64	.probe	= ns16550_serial_probe,
65	.ops	= &ns16550_serial_ops,
66};
67