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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2020 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#include <libfdt.h>
#include <sbi/sbi_scratch.h>
#include <sbi_utils/fdt/fdt_helper.h>
#include <sbi_utils/serial/fdt_serial.h>
extern struct fdt_serial fdt_serial_uart8250;
extern struct fdt_serial fdt_serial_sifive;
extern struct fdt_serial fdt_serial_htif;
static struct fdt_serial *serial_drivers[] = {
&fdt_serial_uart8250,
&fdt_serial_sifive,
&fdt_serial_htif,
};
static void dummy_putc(char ch)
{
}
static int dummy_getc(void)
{
return -1;
}
static struct fdt_serial dummy = {
.match_table = NULL,
.init = NULL,
.putc = dummy_putc,
.getc = dummy_getc,
};
static struct fdt_serial *current_driver = &dummy;
void fdt_serial_putc(char ch)
{
current_driver->putc(ch);
}
int fdt_serial_getc(void)
{
return current_driver->getc();
}
int fdt_serial_init(void)
{
const void *prop;
struct fdt_serial *drv;
const struct fdt_match *match;
int pos, noff = -1, len, coff, rc;
void *fdt = sbi_scratch_thishart_arg1_ptr();
/* Find offset of node pointed by stdout-path */
coff = fdt_path_offset(fdt, "/chosen");
if (-1 < coff) {
prop = fdt_getprop(fdt, coff, "stdout-path", &len);
if (prop && len)
noff = fdt_path_offset(fdt, prop);
}
/* First check DT node pointed by stdout-path */
for (pos = 0; pos < array_size(serial_drivers) && -1 < noff; pos++) {
drv = serial_drivers[pos];
match = fdt_match_node(fdt, noff, drv->match_table);
if (!match)
continue;
if (drv->init) {
rc = drv->init(fdt, noff, match);
if (rc)
return rc;
}
current_driver = drv;
break;
}
/* Check if we found desired driver */
if (current_driver != &dummy)
goto done;
/* Lastly check all DT nodes */
for (pos = 0; pos < array_size(serial_drivers); pos++) {
drv = serial_drivers[pos];
noff = fdt_find_match(fdt, drv->match_table, &match);
if (noff < 0)
continue;
if (drv->init) {
rc = drv->init(fdt, noff, match);
if (rc)
return rc;
}
current_driver = drv;
break;
}
done:
return 0;
}
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