1 /*
2 * Copyright (C) 2018-2022 Intel Corporation.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <types.h>
8 #include <rtl.h>
9 #include <pci.h>
10 #include <uart16550.h>
11 #include <dbg_cmd.h>
12
13 #define MAX_PORT 0x10000 /* port 0 - 64K */
14 #define DEFAULT_UART_PORT 0x3F8
15
16 #define MAX_CMD_LEN 64
17
18 static struct uart_cmd {
19 const char *const str;
20 int type;
21 } cmd_list[] = {
22 { "uart=port@", PIO }, /* uart=port@0x3F8 */
23 { "uart=bdf@", PCI }, /* uart=bdf@0xc1 */
24 { "uart=mmio@", MMIO }, /* uart=mmio@0xfe040000 */
25 { "uart=disabled", INVALID }
26 };
27
handle_dbg_cmd(const char * cmd,int32_t len)28 bool handle_dbg_cmd(const char *cmd, int32_t len)
29 {
30 uint32_t i;
31 uint64_t data;
32
33 for (i = 0; i < ARRAY_SIZE(cmd_list); i++) {
34 int32_t tmp = strnlen_s(cmd_list[i].str, MAX_CMD_LEN);
35 int type = cmd_list[i].type;
36
37 /* cmd prefix should be same with one in cmd_list */
38 if (len < tmp)
39 continue;
40
41 if (strncmp(cmd_list[i].str, cmd, tmp) != 0)
42 continue;
43
44 if (type == INVALID) {
45 /* set uart disabled*/
46 uart16550_set_property(false, type, 0UL);
47 } else if (type == PIO) {
48 data = strtoul_hex(cmd + tmp);
49
50 if (data > MAX_PORT) {
51 data = DEFAULT_UART_PORT;
52 }
53
54 uart16550_set_property(true, type, data);
55 } else {
56 data = strtoul_hex(cmd + tmp);
57 uart16550_set_property(true, type, data);
58 }
59 }
60
61 return (i < ARRAY_SIZE(cmd_list));
62 }
63