123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206 |
- /*
- * 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>
- #include <sbi/sbi_timer.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;
- }
- static int sbi_system_suspend_test_check(u32 sleep_type)
- {
- return sleep_type == SBI_SUSP_SLEEP_TYPE_SUSPEND;
- }
- static int sbi_system_suspend_test_suspend(u32 sleep_type,
- unsigned long mmode_resume_addr)
- {
- if (sleep_type != SBI_SUSP_SLEEP_TYPE_SUSPEND)
- return SBI_EINVAL;
- sbi_timer_mdelay(5000);
- /* Wait for interrupt */
- wfi();
- return SBI_OK;
- }
- static struct sbi_system_suspend_device sbi_system_suspend_test = {
- .name = "system-suspend-test",
- .system_suspend_check = sbi_system_suspend_test_check,
- .system_suspend = sbi_system_suspend_test_suspend,
- };
- void sbi_system_suspend_test_enable(void)
- {
- sbi_system_suspend_set_device(&sbi_system_suspend_test);
- }
- 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)
- {
- int ret = SBI_ENOTSUPP;
- const struct sbi_domain *dom = sbi_domain_thishart_ptr();
- struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
- void (*jump_warmboot)(void) = (void (*)(void))scratch->warmboot_addr;
- unsigned int hartid = current_hartid();
- unsigned long prev_mode;
- unsigned long i;
- if (!dom || !dom->system_suspend_allowed)
- return SBI_EFAIL;
- if (!suspend_dev || !suspend_dev->system_suspend)
- return SBI_EFAIL;
- if (!sbi_system_suspend_supported(sleep_type))
- return SBI_ENOTSUPP;
- prev_mode = (csr_read(CSR_MSTATUS) & MSTATUS_MPP) >> MSTATUS_MPP_SHIFT;
- if (prev_mode != PRV_S && prev_mode != PRV_U)
- return SBI_EFAIL;
- sbi_hartmask_for_each_hart(i, &dom->assigned_harts) {
- if (i == hartid)
- continue;
- if (__sbi_hsm_hart_get_state(i) != SBI_HSM_STATE_STOPPED)
- return SBI_EFAIL;
- }
- if (!sbi_domain_check_addr(dom, resume_addr, prev_mode,
- SBI_DOMAIN_EXECUTE))
- return SBI_EINVALID_ADDR;
- if (!sbi_hsm_hart_change_state(scratch, SBI_HSM_STATE_STARTED,
- SBI_HSM_STATE_SUSPENDED))
- return SBI_EFAIL;
- /* Prepare for resume */
- scratch->next_mode = prev_mode;
- scratch->next_addr = resume_addr;
- scratch->next_arg1 = opaque;
- __sbi_hsm_suspend_non_ret_save(scratch);
- /* Suspend */
- ret = suspend_dev->system_suspend(sleep_type, scratch->warmboot_addr);
- if (ret != SBI_OK) {
- if (!sbi_hsm_hart_change_state(scratch, SBI_HSM_STATE_SUSPENDED,
- SBI_HSM_STATE_STARTED))
- sbi_hart_hang();
- return ret;
- }
- /* Resume */
- jump_warmboot();
- __builtin_unreachable();
- }
|