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 */
125