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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2008 David Gibson, IBM Corporation
* Copyright (C) 2012 Regents of the University of California
* Copyright (C) 2017 SiFive
*/
#include <linux/console.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <asm/sbi.h>
#include "hvc_console.h"
static ssize_t hvc_sbi_tty_put(uint32_t vtermno, const u8 *buf, size_t count)
{
size_t i;
for (i = 0; i < count; i++)
sbi_console_putchar(buf[i]);
return i;
}
static ssize_t hvc_sbi_tty_get(uint32_t vtermno, u8 *buf, size_t count)
{
size_t i;
int c;
for (i = 0; i < count; i++) {
c = sbi_console_getchar();
if (c < 0)
break;
buf[i] = c;
}
return i;
}
static const struct hv_ops hvc_sbi_v01_ops = {
.get_chars = hvc_sbi_tty_get,
.put_chars = hvc_sbi_tty_put,
};
static ssize_t hvc_sbi_dbcn_tty_put(uint32_t vtermno, const u8 *buf, size_t count)
{
return sbi_debug_console_write(buf, count);
}
static ssize_t hvc_sbi_dbcn_tty_get(uint32_t vtermno, u8 *buf, size_t count)
{
return sbi_debug_console_read(buf, count);
}
static const struct hv_ops hvc_sbi_dbcn_ops = {
.put_chars = hvc_sbi_dbcn_tty_put,
.get_chars = hvc_sbi_dbcn_tty_get,
};
static int __init hvc_sbi_init(void)
{
int err;
if (sbi_debug_console_available) {
err = PTR_ERR_OR_ZERO(hvc_alloc(0, 0, &hvc_sbi_dbcn_ops, 256));
if (err)
return err;
hvc_instantiate(0, 0, &hvc_sbi_dbcn_ops);
} else if (IS_ENABLED(CONFIG_RISCV_SBI_V01)) {
err = PTR_ERR_OR_ZERO(hvc_alloc(0, 0, &hvc_sbi_v01_ops, 256));
if (err)
return err;
hvc_instantiate(0, 0, &hvc_sbi_v01_ops);
} else {
return -ENODEV;
}
return 0;
}
device_initcall(hvc_sbi_init);
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