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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2025 ISCAS
*
* Authors:
* Icenowy Zheng <[email protected]>
*/
#include <sbi/riscv_io.h>
#include <sbi/sbi_console.h>
#include <sbi_utils/serial/altr-juart.h>
/* clang-format off */
#define JUART_DATA_OFFSET 0x00
# define JUART_DATA_DATA_MASK 0x000000ff
# define JUART_DATA_RVALID (1 << 15)
# define JUART_DATA_RAVAIL_MASK 0xffff0000
# define JUART_DATA_RAVAIL_SHIFT 16
#define JUART_CTRL_OFFSET 0x04
# define JUART_CTRL_RE (1 << 0)
# define JUART_CTRL_WE (1 << 1)
# define JUART_CTRL_RI (1 << 8)
# define JUART_CTRL_WI (1 << 9)
# define JUART_CTRL_AC (1 << 10)
# define JUART_CTRL_WSPACE_MASK 0xffff0000
# define JUART_CTRL_WSPACE_SHIFT 16
/* clang-format on */
static volatile char *altr_juart_base;
static u32 get_reg(u32 offset)
{
return readl(altr_juart_base + offset);
}
static void set_reg(u32 offset, u32 val)
{
writel(val, altr_juart_base + offset);
}
static void altr_juart_putc(char ch)
{
while(!(get_reg(JUART_CTRL_OFFSET) & JUART_CTRL_WSPACE_MASK))
;
set_reg(JUART_DATA_OFFSET, (unsigned char)ch);
}
static int altr_juart_getc(void)
{
u32 reg = get_reg(JUART_DATA_OFFSET);
if (reg & JUART_DATA_RVALID)
return reg & JUART_DATA_DATA_MASK;
return -1;
}
static struct sbi_console_device altr_juart_console = {
.name = "altr-juart",
.console_putc = altr_juart_putc,
.console_getc = altr_juart_getc
};
int altr_juart_init(unsigned long base)
{
altr_juart_base = (volatile char *)base;
sbi_console_set_device(&altr_juart_console);
return 0;
}
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