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/*
* Copyright (c) 2011 The Chromium OS Authors.
*
* SPDX-License-Identifier: GPL-2.0+
*/
/*
* This provide a test serial port. It provides an emulated serial port where
* a test program and read out the serial output and inject serial input for
* U-Boot.
*/
#include <common.h>
#include <dm.h>
#include <fdtdec.h>
#include <lcd.h>
#include <os.h>
#include <serial.h>
#include <linux/compiler.h>
#include <asm/state.h>
DECLARE_GLOBAL_DATA_PTR;
/*
*
* serial_buf: A buffer that holds keyboard characters for the
* Sandbox U-boot.
*
* invariants:
* serial_buf_write == serial_buf_read -> empty buffer
* (serial_buf_write + 1) % 16 == serial_buf_read -> full buffer
*/
static char serial_buf[16];
static unsigned int serial_buf_write;
static unsigned int serial_buf_read;
static int sandbox_serial_probe(struct udevice *dev)
{
struct sandbox_state *state = state_get_current();
if (state->term_raw != STATE_TERM_COOKED)
os_tty_raw(0, state->term_raw == STATE_TERM_RAW_WITH_SIGS);
return 0;
}
static int sandbox_serial_putc(struct udevice *dev, const char ch)
{
os_write(1, &ch, 1);
return 0;
}
static unsigned int increment_buffer_index(unsigned int index)
{
return (index + 1) % ARRAY_SIZE(serial_buf);
}
static int sandbox_serial_pending(struct udevice *dev, bool input)
{
const unsigned int next_index =
increment_buffer_index(serial_buf_write);
ssize_t count;
if (!input)
return 0;
os_usleep(100);
#ifdef CONFIG_LCD
lcd_sync();
#endif
if (next_index == serial_buf_read)
return 1; /* buffer full */
count = os_read_no_block(0, &serial_buf[serial_buf_write], 1);
if (count == 1)
serial_buf_write = next_index;
return serial_buf_write != serial_buf_read;
}
static int sandbox_serial_getc(struct udevice *dev)
{
int result;
if (!sandbox_serial_pending(dev, true))
return -EAGAIN; /* buffer empty */
result = serial_buf[serial_buf_read];
serial_buf_read = increment_buffer_index(serial_buf_read);
return result;
}
static const struct dm_serial_ops sandbox_serial_ops = {
.putc = sandbox_serial_putc,
.pending = sandbox_serial_pending,
.getc = sandbox_serial_getc,
};
static const struct udevice_id sandbox_serial_ids[] = {
{ .compatible = "sandbox,serial" },
{ }
};
U_BOOT_DRIVER(serial_sandbox) = {
.name = "serial_sandbox",
.id = UCLASS_SERIAL,
.of_match = sandbox_serial_ids,
.probe = sandbox_serial_probe,
.ops = &sandbox_serial_ops,
.flags = DM_FLAG_PRE_RELOC,
};
U_BOOT_DEVICE(serial_sandbox_non_fdt) = {
.name = "serial_sandbox",
};
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