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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2021 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#include <sbi/riscv_asm.h>
#include <sbi/riscv_atomic.h>
#include <sbi/riscv_io.h>
#include <sbi/sbi_domain.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_hartmask.h>
#include <sbi/sbi_ipi.h>
#include <sbi/sbi_timer.h>
#include <sbi_utils/ipi/aclint_mswi.h>
static struct aclint_mswi_data *mswi_hartid2data[SBI_HARTMASK_MAX_BITS];
static void mswi_ipi_send(u32 target_hart)
{
u32 *msip;
struct aclint_mswi_data *mswi;
if (SBI_HARTMASK_MAX_BITS <= target_hart)
return;
mswi = mswi_hartid2data[target_hart];
if (!mswi)
return;
/* Set ACLINT IPI */
msip = (void *)mswi->addr;
writel(1, &msip[target_hart - mswi->first_hartid]);
}
static void mswi_ipi_clear(u32 target_hart)
{
u32 *msip;
struct aclint_mswi_data *mswi;
if (SBI_HARTMASK_MAX_BITS <= target_hart)
return;
mswi = mswi_hartid2data[target_hart];
if (!mswi)
return;
/* Clear ACLINT IPI */
msip = (void *)mswi->addr;
writel(0, &msip[target_hart - mswi->first_hartid]);
}
static struct sbi_ipi_device aclint_mswi = {
.name = "aclint-mswi",
.ipi_send = mswi_ipi_send,
.ipi_clear = mswi_ipi_clear
};
int aclint_mswi_warm_init(void)
{
/* Clear IPI for current HART */
mswi_ipi_clear(current_hartid());
return 0;
}
int aclint_mswi_cold_init(struct aclint_mswi_data *mswi)
{
u32 i;
int rc;
unsigned long pos, region_size;
struct sbi_domain_memregion reg;
/* Sanity checks */
if (!mswi || (mswi->addr & (ACLINT_MSWI_ALIGN - 1)) ||
(mswi->size < (mswi->hart_count * sizeof(u32))) ||
(mswi->first_hartid >= SBI_HARTMASK_MAX_BITS) ||
(mswi->hart_count > ACLINT_MSWI_MAX_HARTS))
return SBI_EINVAL;
/* Update MSWI hartid table */
for (i = 0; i < mswi->hart_count; i++)
mswi_hartid2data[mswi->first_hartid + i] = mswi;
/* Add MSWI regions to the root domain */
for (pos = 0; pos < mswi->size; pos += ACLINT_MSWI_ALIGN) {
region_size = ((mswi->size - pos) < ACLINT_MSWI_ALIGN) ?
(mswi->size - pos) : ACLINT_MSWI_ALIGN;
sbi_domain_memregion_init(mswi->addr + pos, region_size,
SBI_DOMAIN_MEMREGION_MMIO, ®);
rc = sbi_domain_root_add_memregion(®);
if (rc)
return rc;
}
sbi_ipi_set_device(&aclint_mswi);
return 0;
}
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