1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (C) 2008 David Gibson, IBM Corporation
4 * Copyright (C) 2012 Regents of the University of California
5 * Copyright (C) 2017 SiFive
8 #include <linux/console.h>
10 #include <linux/init.h>
11 #include <linux/moduleparam.h>
12 #include <linux/types.h>
16 #include "hvc_console.h"
18 static ssize_t hvc_sbi_tty_put(uint32_t vtermno, const u8 *buf, size_t count)
22 for (i = 0; i < count; i++)
23 sbi_console_putchar(buf[i]);
28 static ssize_t hvc_sbi_tty_get(uint32_t vtermno, u8 *buf, size_t count)
33 for (i = 0; i < count; i++) {
34 c = sbi_console_getchar();
43 static const struct hv_ops hvc_sbi_v01_ops = {
44 .get_chars = hvc_sbi_tty_get,
45 .put_chars = hvc_sbi_tty_put,
48 static ssize_t hvc_sbi_dbcn_tty_put(uint32_t vtermno, const u8 *buf, size_t count)
50 return sbi_debug_console_write(buf, count);
53 static ssize_t hvc_sbi_dbcn_tty_get(uint32_t vtermno, u8 *buf, size_t count)
55 return sbi_debug_console_read(buf, count);
58 static const struct hv_ops hvc_sbi_dbcn_ops = {
59 .put_chars = hvc_sbi_dbcn_tty_put,
60 .get_chars = hvc_sbi_dbcn_tty_get,
63 static int __init hvc_sbi_init(void)
67 if (sbi_debug_console_available) {
68 err = PTR_ERR_OR_ZERO(hvc_alloc(0, 0, &hvc_sbi_dbcn_ops, 256));
71 hvc_instantiate(0, 0, &hvc_sbi_dbcn_ops);
72 } else if (IS_ENABLED(CONFIG_RISCV_SBI_V01)) {
73 err = PTR_ERR_OR_ZERO(hvc_alloc(0, 0, &hvc_sbi_v01_ops, 256));
76 hvc_instantiate(0, 0, &hvc_sbi_v01_ops);
83 device_initcall(hvc_sbi_init);