irq.h

  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/*
 43 * 256 Vectors Mapping for AVECINTC:
 44 *
 45 * 0 - 15: Mapping classic IPs, e.g. IP0-12.
 46 * 16 - 255: Mapping vectors for external IRQ.
 47 *
 48 */
 49#define NR_VECTORS		256
 50#define NR_LEGACY_VECTORS	16
 51#define IRQ_MATRIX_BITS		NR_VECTORS
 52
 53#define AVEC_IRQ_SHIFT		4
 54#define AVEC_IRQ_BIT		8
 55#define AVEC_IRQ_MASK		GENMASK(AVEC_IRQ_BIT - 1, 0)
 56#define AVEC_CPU_SHIFT		12
 57#define AVEC_CPU_BIT		16
 58#define AVEC_CPU_MASK		GENMASK(AVEC_CPU_BIT - 1, 0)
 59
 60#define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
 61void arch_trigger_cpumask_backtrace(const struct cpumask *mask, int exclude_cpu);
 62
 63#ifdef CONFIG_32BIT
 64#define MAX_IO_PICS 1
 65#else
 66#define MAX_IO_PICS 8
 67#endif
 68
 69#define NR_IRQS	(64 + NR_VECTORS * (NR_CPUS + MAX_IO_PICS))
 70
 71struct acpi_vector_group {
 72	int node;
 73	int pci_segment;
 74	struct irq_domain *parent;
 75};
 76extern struct acpi_vector_group pch_group[MAX_IO_PICS];
 77extern struct acpi_vector_group msi_group[MAX_IO_PICS];
 78
 79#define CORES_PER_EIO_NODE	4
 80#define CORES_PER_VEIO_NODE	256
 81
 82#define LOONGSON_CPU_UART0_VEC		10 /* CPU UART0 */
 83#define LOONGSON_CPU_THSENS_VEC		14 /* CPU Thsens */
 84#define LOONGSON_CPU_HT0_VEC		16 /* CPU HT0 irq vector base number */
 85#define LOONGSON_CPU_HT1_VEC		24 /* CPU HT1 irq vector base number */
 86
 87/* IRQ number definitions */
 88#define LOONGSON_LPC_IRQ_BASE		0
 89#define LOONGSON_LPC_LAST_IRQ		(LOONGSON_LPC_IRQ_BASE + 15)
 90
 91#define LOONGSON_CPU_IRQ_BASE		16
 92#define LOONGSON_CPU_LAST_IRQ		(LOONGSON_CPU_IRQ_BASE + 15)
 93
 94#define LOONGSON_PCH_IRQ_BASE		64
 95#define LOONGSON_PCH_ACPI_IRQ		(LOONGSON_PCH_IRQ_BASE + 47)
 96#define LOONGSON_PCH_LAST_IRQ		(LOONGSON_PCH_IRQ_BASE + 64 - 1)
 97
 98#define LOONGSON_MSI_IRQ_BASE		(LOONGSON_PCH_IRQ_BASE + 64)
 99#define LOONGSON_MSI_LAST_IRQ		(LOONGSON_PCH_IRQ_BASE + 256 - 1)
100
101#define GSI_MIN_LPC_IRQ		LOONGSON_LPC_IRQ_BASE
102#define GSI_MAX_LPC_IRQ		(LOONGSON_LPC_IRQ_BASE + 16 - 1)
103#define GSI_MIN_CPU_IRQ		LOONGSON_CPU_IRQ_BASE
104#define GSI_MAX_CPU_IRQ		(LOONGSON_CPU_IRQ_BASE + 48 - 1)
105#define GSI_MIN_PCH_IRQ		LOONGSON_PCH_IRQ_BASE
106#define GSI_MAX_PCH_IRQ		(LOONGSON_PCH_IRQ_BASE + 256 - 1)
107
108struct acpi_madt_lio_pic;
109struct acpi_madt_eio_pic;
110struct acpi_madt_ht_pic;
111struct acpi_madt_bio_pic;
112struct acpi_madt_msi_pic;
113struct acpi_madt_lpc_pic;
114
115void complete_irq_moving(void);
116
117struct fwnode_handle *get_pch_msi_handle(int pci_segment);
118
119extern struct acpi_madt_lio_pic *acpi_liointc;
120extern struct acpi_madt_eio_pic *acpi_eiointc[MAX_IO_PICS];
121
122extern struct acpi_madt_ht_pic *acpi_htintc;
123extern struct acpi_madt_lpc_pic *acpi_pchlpc;
124extern struct acpi_madt_msi_pic *acpi_pchmsi[MAX_IO_PICS];
125extern struct acpi_madt_bio_pic *acpi_pchpic[MAX_IO_PICS];
126
127extern struct fwnode_handle *cpuintc_handle;
128extern struct fwnode_handle *liointc_handle;
129extern struct fwnode_handle *pch_lpc_handle;
130extern struct fwnode_handle *pch_pic_handle[MAX_IO_PICS];
131
132static inline int get_percpu_irq(int vector)
133{
134	struct irq_domain *d;
135
136	d = irq_find_matching_fwnode(cpuintc_handle, DOMAIN_BUS_ANY);
137	if (d)
138		return irq_create_mapping(d, vector);
139
140	return -EINVAL;
141}
142
143#include <asm-generic/irq.h>
144
145#endif /* _ASM_IRQ_H */