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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2021 Marcelo Politzer <marcelo.politzer@cartesi.io>
*/
#include <common.h>
#include <driver.h>
#include <malloc.h>
#include <asm/sbi.h>
struct sbi_serial_priv {
struct console_device cdev;
uint8_t b[2], head, tail;
};
static int sbi_serial_getc(struct console_device *cdev)
{
struct sbi_serial_priv *priv = cdev->dev->priv;
if (priv->head == priv->tail)
return -1;
return priv->b[priv->head++ & 0x1];
}
static void sbi_serial_putc(struct console_device *cdev, const char ch)
{
sbi_console_putchar(ch);
}
static int sbi_serial_tstc(struct console_device *cdev)
{
struct sbi_serial_priv *priv = cdev->dev->priv;
int c = sbi_console_getchar();
if (c != -1)
priv->b[priv->tail++ & 0x1] = c;
return priv->head != priv->tail;
}
static int sbi_serial_probe(struct device *dev)
{
struct sbi_serial_priv *priv;
priv = dev->priv = xzalloc(sizeof(*priv));
priv->cdev.dev = dev;
priv->cdev.putc = sbi_serial_putc;
priv->cdev.getc = sbi_serial_getc;
priv->cdev.tstc = sbi_serial_tstc;
priv->cdev.flush = 0;
priv->cdev.setbrg = 0;
return console_register(&priv->cdev);
}
static struct driver serial_sbi_driver = {
.name = "riscv-serial-sbi",
.probe = sbi_serial_probe,
};
postcore_platform_driver(serial_sbi_driver);
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