890fcefe2e
Adjust the sandbox serial driver to use the new driver model uclass. The driver works much as before, but within the new framework. Signed-off-by: Simon Glass <sjg@chromium.org>
117 lines
2.5 KiB
C
117 lines
2.5 KiB
C
/*
|
|
* 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",
|
|
};
|