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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>
*/
#include <sbi/riscv_io.h>
#include <sbi/riscv_encoding.h>
#include <sbi/sbi_console.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_string.h>
#include <sbi_utils/irqchip/plic.h>
#define PLIC_PRIORITY_BASE 0x0
#define PLIC_PENDING_BASE 0x1000
#define PLIC_ENABLE_BASE 0x2000
#define PLIC_ENABLE_STRIDE 0x80
#define PLIC_CONTEXT_BASE 0x200000
#define PLIC_CONTEXT_STRIDE 0x1000
static void plic_set_priority(struct plic_data *plic, u32 source, u32 val)
{
volatile void *plic_priority = (void *)plic->addr +
PLIC_PRIORITY_BASE + 4 * source;
writel(val, plic_priority);
}
void plic_set_thresh(struct plic_data *plic, u32 cntxid, u32 val)
{
volatile void *plic_thresh;
if (!plic)
return;
plic_thresh = (void *)plic->addr +
PLIC_CONTEXT_BASE + PLIC_CONTEXT_STRIDE * cntxid;
writel(val, plic_thresh);
}
void plic_set_ie(struct plic_data *plic, u32 cntxid, u32 word_index, u32 val)
{
volatile void *plic_ie;
if (!plic)
return;
plic_ie = (void *)plic->addr +
PLIC_ENABLE_BASE + PLIC_ENABLE_STRIDE * cntxid;
writel(val, plic_ie + word_index * 4);
}
int plic_warm_irqchip_init(struct plic_data *plic,
int m_cntx_id, int s_cntx_id)
{
size_t i, ie_words;
if (!plic)
return SBI_EINVAL;
ie_words = plic->num_src / 32 + 1;
/* By default, disable all IRQs for M-mode of target HART */
if (m_cntx_id > -1) {
for (i = 0; i < ie_words; i++)
plic_set_ie(plic, m_cntx_id, i, 0);
}
/* By default, disable all IRQs for S-mode of target HART */
if (s_cntx_id > -1) {
for (i = 0; i < ie_words; i++)
plic_set_ie(plic, s_cntx_id, i, 0);
}
/* By default, disable M-mode threshold */
if (m_cntx_id > -1)
plic_set_thresh(plic, m_cntx_id, 0x7);
/* By default, disable S-mode threshold */
if (s_cntx_id > -1)
plic_set_thresh(plic, s_cntx_id, 0x7);
return 0;
}
int plic_cold_irqchip_init(struct plic_data *plic)
{
int i;
if (!plic)
return SBI_EINVAL;
/* Configure default priorities of all IRQs */
for (i = 1; i <= plic->num_src; i++)
plic_set_priority(plic, i, 0);
return 0;
}
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