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- /*
- * SPDX-License-Identifier: BSD-2-Clause
- *
- * Copyright (c) 2019 Western Digital Corporation or its affiliates.
- *
- * Authors:
- * Anup Patel <anup.patel@wdc.com>
- * Nick Kossifidis <mick@ics.forth.gr>
- */
- #include <sbi/riscv_asm.h>
- #include <sbi/sbi_bitops.h>
- #include <sbi/sbi_domain.h>
- #include <sbi/sbi_hart.h>
- #include <sbi/sbi_hsm.h>
- #include <sbi/sbi_platform.h>
- #include <sbi/sbi_system.h>
- #include <sbi/sbi_ipi.h>
- #include <sbi/sbi_init.h>
- static SBI_LIST_HEAD(reset_devices_list);
- const struct sbi_system_reset_device *sbi_system_reset_get_device(
- u32 reset_type, u32 reset_reason)
- {
- struct sbi_system_reset_device *reset_dev = NULL;
- struct sbi_dlist *pos;
- /** lowest priority - any non zero is our candidate */
- int priority = 0;
- /* Check each reset device registered for supported reset type */
- sbi_list_for_each(pos, &(reset_devices_list)) {
- struct sbi_system_reset_device *dev =
- to_system_reset_device(pos);
- if (dev->system_reset_check) {
- int status = dev->system_reset_check(reset_type,
- reset_reason);
- /** reset_type not supported */
- if (status == 0)
- continue;
- if (status > priority) {
- reset_dev = dev;
- priority = status;
- }
- }
- }
- return reset_dev;
- }
- void sbi_system_reset_add_device(struct sbi_system_reset_device *dev)
- {
- if (!dev || !dev->system_reset_check)
- return;
- sbi_list_add(&(dev->node), &(reset_devices_list));
- }
- bool sbi_system_reset_supported(u32 reset_type, u32 reset_reason)
- {
- return !!sbi_system_reset_get_device(reset_type, reset_reason);
- }
- void __noreturn sbi_system_reset(u32 reset_type, u32 reset_reason)
- {
- ulong hbase = 0, hmask;
- u32 cur_hartid = current_hartid();
- struct sbi_domain *dom = sbi_domain_thishart_ptr();
- struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
- /* Send HALT IPI to every hart other than the current hart */
- while (!sbi_hsm_hart_interruptible_mask(dom, hbase, &hmask)) {
- if (hbase <= cur_hartid)
- hmask &= ~(1UL << (cur_hartid - hbase));
- if (hmask)
- sbi_ipi_send_halt(hmask, hbase);
- hbase += BITS_PER_LONG;
- }
- /* Stop current HART */
- sbi_hsm_hart_stop(scratch, false);
- /* Platform specific reset if domain allowed system reset */
- if (dom->system_reset_allowed) {
- const struct sbi_system_reset_device *dev =
- sbi_system_reset_get_device(reset_type, reset_reason);
- if (dev)
- dev->system_reset(reset_type, reset_reason);
- }
- /* If platform specific reset did not work then do sbi_exit() */
- sbi_exit(scratch);
- }
- static const struct sbi_system_suspend_device *suspend_dev = NULL;
- const struct sbi_system_suspend_device *sbi_system_suspend_get_device(void)
- {
- return suspend_dev;
- }
- void sbi_system_suspend_set_device(struct sbi_system_suspend_device *dev)
- {
- if (!dev || suspend_dev)
- return;
- suspend_dev = dev;
- }
- bool sbi_system_suspend_supported(u32 sleep_type)
- {
- return suspend_dev && suspend_dev->system_suspend_check &&
- suspend_dev->system_suspend_check(sleep_type);
- }
- int sbi_system_suspend(u32 sleep_type, ulong resume_addr, ulong opaque)
- {
- return 0;
- }
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