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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2020 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#include <libfdt.h>
#include <sbi/riscv_asm.h>
#include <sbi/riscv_io.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_heap.h>
#include <sbi/sbi_platform.h>
#include <sbi/sbi_scratch.h>
#include <sbi_utils/fdt/fdt_helper.h>
#include <sbi_utils/irqchip/fdt_irqchip.h>
#include <sbi_utils/irqchip/plic.h>
static int irqchip_plic_update_context_map(const void *fdt, int nodeoff,
struct plic_data *pd)
{
const fdt32_t *val;
u32 phandle, hwirq, hartid, hartindex;
int i, err, count, cpu_offset, cpu_intc_offset;
val = fdt_getprop(fdt, nodeoff, "interrupts-extended", &count);
if (!val || count < sizeof(fdt32_t))
return SBI_EINVAL;
count = count / sizeof(fdt32_t);
for (i = 0; i < count; i += 2) {
phandle = fdt32_to_cpu(val[i]);
hwirq = fdt32_to_cpu(val[i + 1]);
cpu_intc_offset = fdt_node_offset_by_phandle(fdt, phandle);
if (cpu_intc_offset < 0)
continue;
cpu_offset = fdt_parent_offset(fdt, cpu_intc_offset);
if (cpu_offset < 0)
continue;
err = fdt_parse_hart_id(fdt, cpu_offset, &hartid);
if (err)
continue;
hartindex = sbi_hartid_to_hartindex(hartid);
if (hartindex == -1U)
continue;
switch (hwirq) {
case IRQ_M_EXT:
pd->context_map[hartindex][PLIC_M_CONTEXT] = i / 2;
break;
case IRQ_S_EXT:
pd->context_map[hartindex][PLIC_S_CONTEXT] = i / 2;
break;
}
}
return 0;
}
static int irqchip_plic_cold_init(const void *fdt, int nodeoff,
const struct fdt_match *match)
{
struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
const struct sbi_platform *plat = sbi_platform_ptr(scratch);
int rc;
struct plic_data *pd;
pd = sbi_zalloc(PLIC_DATA_SIZE(plat->hart_count));
if (!pd)
return SBI_ENOMEM;
rc = fdt_parse_plic_node(fdt, nodeoff, pd);
if (rc)
goto fail_free_data;
pd->flags = (unsigned long)match->data;
rc = irqchip_plic_update_context_map(fdt, nodeoff, pd);
if (rc)
goto fail_free_data;
rc = plic_cold_irqchip_init(pd);
if (rc)
goto fail_free_data;
return 0;
fail_free_data:
sbi_free(pd);
return rc;
}
static const struct fdt_match irqchip_plic_match[] = {
{ .compatible = "andestech,nceplic100" },
{ .compatible = "sifive,plic-1.0.0" },
{ .compatible = "thead,c900-plic",
.data = (void *)(PLIC_FLAG_THEAD_DELEGATION | PLIC_FLAG_ENABLE_PM) },
/*
* We keep the generic RISC-V PLIC at the end.
* This ensures we match against more specific options first.
* (This is important if the PLIC has quirks, like the T-HEAD PLIC.)
*/
{ .compatible = "riscv,plic0" },
{ /* sentinel */ }
};
const struct fdt_driver fdt_irqchip_plic = {
.match_table = irqchip_plic_match,
.init = irqchip_plic_cold_init,
};
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