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 */
slimbootloader_serial_of_to_plat(struct udevice * dev)18 static 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
52 static const struct udevice_id slimbootloader_serial_ids[] = {
53 { .compatible = "intel,slimbootloader-uart" },
54 {}
55 };
56
57 U_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