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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;
- extern struct fdt_serial fdt_serial_shakti;
- extern struct fdt_serial fdt_serial_gaisler;
- static struct fdt_serial *serial_drivers[] = {
- &fdt_serial_uart8250,
- &fdt_serial_sifive,
- &fdt_serial_htif,
- &fdt_serial_shakti,
- &fdt_serial_gaisler
- };
- static struct fdt_serial dummy = {
- .match_table = NULL,
- .init = NULL,
- };
- static struct fdt_serial *current_driver = &dummy;
- 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, -1, 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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