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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/irqdomain.h>
#include <asm/loongarch.h>
#include <asm/setup.h>
static struct irq_domain *irq_domain;
struct fwnode_handle *cpuintc_handle;
static u32 lpic_gsi_to_irq(u32 gsi)
{
/* Only pch irqdomain transferring is required for LoongArch. */
if (gsi >= GSI_MIN_PCH_IRQ && gsi <= GSI_MAX_PCH_IRQ)
return acpi_register_gsi(NULL, gsi, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_HIGH);
return 0;
}
static struct fwnode_handle *lpic_get_gsi_domain_id(u32 gsi)
{
int id;
struct fwnode_handle *domain_handle = NULL;
switch (gsi) {
case GSI_MIN_CPU_IRQ ... GSI_MAX_CPU_IRQ:
if (liointc_handle)
domain_handle = liointc_handle;
break;
case GSI_MIN_LPC_IRQ ... GSI_MAX_LPC_IRQ:
if (pch_lpc_handle)
domain_handle = pch_lpc_handle;
break;
case GSI_MIN_PCH_IRQ ... GSI_MAX_PCH_IRQ:
id = find_pch_pic(gsi);
if (id >= 0 && pch_pic_handle[id])
domain_handle = pch_pic_handle[id];
break;
}
return domain_handle;
}
static void mask_loongarch_irq(struct irq_data *d)
{
clear_csr_ecfg(ECFGF(d->hwirq));
}
static void unmask_loongarch_irq(struct irq_data *d)
{
set_csr_ecfg(ECFGF(d->hwirq));
}
static struct irq_chip cpu_irq_controller = {
.name = "CPUINTC",
.irq_mask = mask_loongarch_irq,
.irq_unmask = unmask_loongarch_irq,
};
static void handle_cpu_irq(struct pt_regs *regs)
{
int hwirq;
unsigned int estat = read_csr_estat() & CSR_ESTAT_IS;
while ((hwirq = ffs(estat))) {
estat &= ~BIT(hwirq - 1);
generic_handle_domain_irq(irq_domain, hwirq - 1);
}
}
static int loongarch_cpu_intc_map(struct irq_domain *d, unsigned int irq,
irq_hw_number_t hwirq)
{
irq_set_noprobe(irq);
irq_set_chip_and_handler(irq, &cpu_irq_controller, handle_percpu_irq);
return 0;
}
static const struct irq_domain_ops loongarch_cpu_intc_irq_domain_ops = {
.map = loongarch_cpu_intc_map,
.xlate = irq_domain_xlate_onecell,
};
static int __init
liointc_parse_madt(union acpi_subtable_headers *header,
const unsigned long end)
{
struct acpi_madt_lio_pic *liointc_entry = (struct acpi_madt_lio_pic *)header;
return liointc_acpi_init(irq_domain, liointc_entry);
}
static int __init
eiointc_parse_madt(union acpi_subtable_headers *header,
const unsigned long end)
{
struct acpi_madt_eio_pic *eiointc_entry = (struct acpi_madt_eio_pic *)header;
return eiointc_acpi_init(irq_domain, eiointc_entry);
}
static int __init acpi_cascade_irqdomain_init(void)
{
acpi_table_parse_madt(ACPI_MADT_TYPE_LIO_PIC,
liointc_parse_madt, 0);
acpi_table_parse_madt(ACPI_MADT_TYPE_EIO_PIC,
eiointc_parse_madt, 0);
return 0;
}
static int __init cpuintc_acpi_init(union acpi_subtable_headers *header,
const unsigned long end)
{
if (irq_domain)
return 0;
/* Mask interrupts. */
clear_csr_ecfg(ECFG0_IM);
clear_csr_estat(ESTATF_IP);
cpuintc_handle = irq_domain_alloc_fwnode(NULL);
irq_domain = irq_domain_create_linear(cpuintc_handle, EXCCODE_INT_NUM,
&loongarch_cpu_intc_irq_domain_ops, NULL);
if (!irq_domain)
panic("Failed to add irqdomain for LoongArch CPU");
set_handle_irq(&handle_cpu_irq);
acpi_set_irq_model(ACPI_IRQ_MODEL_LPIC, lpic_get_gsi_domain_id);
acpi_set_gsi_to_irq_fallback(lpic_gsi_to_irq);
acpi_cascade_irqdomain_init();
return 0;
}
IRQCHIP_ACPI_DECLARE(cpuintc_v1, ACPI_MADT_TYPE_CORE_PIC,
NULL, ACPI_MADT_CORE_PIC_VERSION_V1, cpuintc_acpi_init);
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