mirror of
https://github.com/riscv-software-src/opensbi.git
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264d0be1fd
A final check of all DT nodes does not necessarily find a match, so SBI_ENODEV needs to be returned. Optimize removal of current_driver. Signed-off-by: Xiang W <wxjstz@126.com> Reviewed-by: Anup Patel <anup@brainfault.org>
83 lines
1.9 KiB
C
83 lines
1.9 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2020 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Anup Patel <anup.patel@wdc.com>
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*/
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#include <libfdt.h>
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#include <sbi/sbi_error.h>
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#include <sbi/sbi_scratch.h>
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#include <sbi_utils/fdt/fdt_helper.h>
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#include <sbi_utils/serial/fdt_serial.h>
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/* List of FDT serial drivers generated at compile time */
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extern struct fdt_serial *fdt_serial_drivers[];
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extern unsigned long fdt_serial_drivers_size;
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int fdt_serial_init(void)
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{
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const void *prop;
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struct fdt_serial *drv;
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const struct fdt_match *match;
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int pos, noff = -1, len, coff, rc;
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void *fdt = fdt_get_address();
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/* Find offset of node pointed to by stdout-path */
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coff = fdt_path_offset(fdt, "/chosen");
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if (-1 < coff) {
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prop = fdt_getprop(fdt, coff, "stdout-path", &len);
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if (prop && len) {
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const char *sep, *start = prop;
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/* The device path may be followed by ':' */
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sep = strchr(start, ':');
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if (sep)
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noff = fdt_path_offset_namelen(fdt, prop,
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sep - start);
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else
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noff = fdt_path_offset(fdt, prop);
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}
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}
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/* First check DT node pointed by stdout-path */
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for (pos = 0; pos < fdt_serial_drivers_size && -1 < noff; pos++) {
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drv = fdt_serial_drivers[pos];
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match = fdt_match_node(fdt, noff, drv->match_table);
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if (!match)
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continue;
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/* drv->init must not be NULL */
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if (drv->init == NULL)
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return SBI_EFAIL;
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rc = drv->init(fdt, noff, match);
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if (rc == SBI_ENODEV)
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continue;
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return rc;
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}
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/* Lastly check all DT nodes */
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for (pos = 0; pos < fdt_serial_drivers_size; pos++) {
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drv = fdt_serial_drivers[pos];
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noff = fdt_find_match(fdt, -1, drv->match_table, &match);
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if (noff < 0)
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continue;
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/* drv->init must not be NULL */
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if (drv->init == NULL)
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return SBI_EFAIL;
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rc = drv->init(fdt, noff, match);
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if (rc == SBI_ENODEV)
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continue;
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return rc;
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}
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return SBI_ENODEV;
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}
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