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