87 lines
1.7 KiB
C
87 lines
1.7 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 <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/ipi/fdt_ipi.h>
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/* List of FDT ipi drivers generated at compile time */
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extern struct fdt_ipi *fdt_ipi_drivers[];
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extern unsigned long fdt_ipi_drivers_size;
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static struct fdt_ipi *current_driver = NULL;
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void fdt_ipi_exit(void)
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{
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if (current_driver && current_driver->exit)
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current_driver->exit();
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}
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static int fdt_ipi_warm_init(void)
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{
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if (current_driver && current_driver->warm_init)
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return current_driver->warm_init();
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return 0;
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}
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static int fdt_ipi_cold_init(void)
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{
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int pos, noff, rc;
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struct fdt_ipi *drv;
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const struct fdt_match *match;
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void *fdt = fdt_get_address();
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for (pos = 0; pos < fdt_ipi_drivers_size; pos++) {
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drv = fdt_ipi_drivers[pos];
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noff = -1;
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while ((noff = fdt_find_match(fdt, noff,
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drv->match_table, &match)) >= 0) {
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if (!fdt_node_is_enabled(fdt, noff))
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continue;
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/* drv->cold_init must not be NULL */
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if (drv->cold_init == NULL)
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return SBI_EFAIL;
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rc = drv->cold_init(fdt, noff, match);
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if (rc == SBI_ENODEV)
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continue;
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if (rc)
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return rc;
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current_driver = drv;
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/*
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* We will have multiple IPI devices on multi-die or
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* multi-socket systems so we cannot break here.
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*/
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}
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}
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/*
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* On some single-hart system there is no need for ipi,
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* so we cannot return a failure here
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*/
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return 0;
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}
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int fdt_ipi_init(bool cold_boot)
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{
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int rc;
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if (cold_boot) {
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rc = fdt_ipi_cold_init();
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if (rc)
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return rc;
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}
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return fdt_ipi_warm_init();
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}
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