1/* SPDX-License-Identifier: GPL-2.0 */
  2/*
  3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
  4 */
  5#ifndef _ASM_IRQ_H
  6#define _ASM_IRQ_H
  7
  8#include <linux/irqdomain.h>
  9#include <linux/irqreturn.h>
 10
 11#define IRQ_STACK_SIZE			THREAD_SIZE
 12#define IRQ_STACK_START			(IRQ_STACK_SIZE - 16)
 13
 14DECLARE_PER_CPU(unsigned long, irq_stack);
 15
 16/*
 17 * The highest address on the IRQ stack contains a dummy frame which is
 18 * structured as follows:
 19 *
 20 *   top ------------
 21 *       | task sp  | <- irq_stack[cpu] + IRQ_STACK_START
 22 *       ------------
 23 *       |          | <- First frame of IRQ context
 24 *       ------------
 25 *
 26 * task sp holds a copy of the task stack pointer where the struct pt_regs
 27 * from exception entry can be found.
 28 */
 29
 30static inline bool on_irq_stack(int cpu, unsigned long sp)
 31{
 32	unsigned long low = per_cpu(irq_stack, cpu);
 33	unsigned long high = low + IRQ_STACK_SIZE;
 34
 35	return (low <= sp && sp <= high);
 36}
 37
 38void spurious_interrupt(void);
 39
 40#define NR_IRQS_LEGACY 16
 41
 42#define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
 43void arch_trigger_cpumask_backtrace(const struct cpumask *mask, int exclude_cpu);
 44
 45#define MAX_IO_PICS 2
 46#define NR_IRQS	(64 + (256 * MAX_IO_PICS))
 47
 48struct acpi_vector_group {
 49	int node;
 50	int pci_segment;
 51	struct irq_domain *parent;
 52};
 53extern struct acpi_vector_group pch_group[MAX_IO_PICS];
 54extern struct acpi_vector_group msi_group[MAX_IO_PICS];
 55
 56#define CORES_PER_EIO_NODE	4
 57
 58#define LOONGSON_CPU_UART0_VEC		10 /* CPU UART0 */
 59#define LOONGSON_CPU_THSENS_VEC		14 /* CPU Thsens */
 60#define LOONGSON_CPU_HT0_VEC		16 /* CPU HT0 irq vector base number */
 61#define LOONGSON_CPU_HT1_VEC		24 /* CPU HT1 irq vector base number */
 62
 63/* IRQ number definitions */
 64#define LOONGSON_LPC_IRQ_BASE		0
 65#define LOONGSON_LPC_LAST_IRQ		(LOONGSON_LPC_IRQ_BASE + 15)
 66
 67#define LOONGSON_CPU_IRQ_BASE		16
 68#define LOONGSON_CPU_LAST_IRQ		(LOONGSON_CPU_IRQ_BASE + 14)
 69
 70#define LOONGSON_PCH_IRQ_BASE		64
 71#define LOONGSON_PCH_ACPI_IRQ		(LOONGSON_PCH_IRQ_BASE + 47)
 72#define LOONGSON_PCH_LAST_IRQ		(LOONGSON_PCH_IRQ_BASE + 64 - 1)
 73
 74#define LOONGSON_MSI_IRQ_BASE		(LOONGSON_PCH_IRQ_BASE + 64)
 75#define LOONGSON_MSI_LAST_IRQ		(LOONGSON_PCH_IRQ_BASE + 256 - 1)
 76
 77#define GSI_MIN_LPC_IRQ		LOONGSON_LPC_IRQ_BASE
 78#define GSI_MAX_LPC_IRQ		(LOONGSON_LPC_IRQ_BASE + 16 - 1)
 79#define GSI_MIN_CPU_IRQ		LOONGSON_CPU_IRQ_BASE
 80#define GSI_MAX_CPU_IRQ		(LOONGSON_CPU_IRQ_BASE + 48 - 1)
 81#define GSI_MIN_PCH_IRQ		LOONGSON_PCH_IRQ_BASE
 82#define GSI_MAX_PCH_IRQ		(LOONGSON_PCH_IRQ_BASE + 256 - 1)
 83
 84struct acpi_madt_lio_pic;
 85struct acpi_madt_eio_pic;
 86struct acpi_madt_ht_pic;
 87struct acpi_madt_bio_pic;
 88struct acpi_madt_msi_pic;
 89struct acpi_madt_lpc_pic;
 90
 91int liointc_acpi_init(struct irq_domain *parent,
 92					struct acpi_madt_lio_pic *acpi_liointc);
 93int eiointc_acpi_init(struct irq_domain *parent,
 94					struct acpi_madt_eio_pic *acpi_eiointc);
 95
 96int htvec_acpi_init(struct irq_domain *parent,
 97					struct acpi_madt_ht_pic *acpi_htvec);
 98int pch_lpc_acpi_init(struct irq_domain *parent,
 99					struct acpi_madt_lpc_pic *acpi_pchlpc);
100int pch_msi_acpi_init(struct irq_domain *parent,
101					struct acpi_madt_msi_pic *acpi_pchmsi);
102int pch_pic_acpi_init(struct irq_domain *parent,
103					struct acpi_madt_bio_pic *acpi_pchpic);
104int find_pch_pic(u32 gsi);
105struct fwnode_handle *get_pch_msi_handle(int pci_segment);
106
107extern struct acpi_madt_lio_pic *acpi_liointc;
108extern struct acpi_madt_eio_pic *acpi_eiointc[MAX_IO_PICS];
109
110extern struct acpi_madt_ht_pic *acpi_htintc;
111extern struct acpi_madt_lpc_pic *acpi_pchlpc;
112extern struct acpi_madt_msi_pic *acpi_pchmsi[MAX_IO_PICS];
113extern struct acpi_madt_bio_pic *acpi_pchpic[MAX_IO_PICS];
114
115extern struct fwnode_handle *cpuintc_handle;
116extern struct fwnode_handle *liointc_handle;
117extern struct fwnode_handle *pch_lpc_handle;
118extern struct fwnode_handle *pch_pic_handle[MAX_IO_PICS];
119
120extern irqreturn_t loongson_ipi_interrupt(int irq, void *dev);
121
122#include <asm-generic/irq.h>
123
124#endif /* _ASM_IRQ_H */