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
14 DECLARE_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
on_irq_stack(int cpu,unsigned long sp)30 static 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
38 void 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
61 void 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
71 struct acpi_vector_group {
72 int node;
73 int pci_segment;
74 struct irq_domain *parent;
75 };
76 extern struct acpi_vector_group pch_group[MAX_IO_PICS];
77 extern 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
108 struct acpi_madt_lio_pic;
109 struct acpi_madt_eio_pic;
110 struct acpi_madt_ht_pic;
111 struct acpi_madt_bio_pic;
112 struct acpi_madt_msi_pic;
113 struct acpi_madt_lpc_pic;
114
115 void complete_irq_moving(void);
116
117 struct fwnode_handle *get_pch_msi_handle(int pci_segment);
118
119 extern struct acpi_madt_lio_pic *acpi_liointc;
120 extern struct acpi_madt_eio_pic *acpi_eiointc[MAX_IO_PICS];
121
122 extern struct acpi_madt_ht_pic *acpi_htintc;
123 extern struct acpi_madt_lpc_pic *acpi_pchlpc;
124 extern struct acpi_madt_msi_pic *acpi_pchmsi[MAX_IO_PICS];
125 extern struct acpi_madt_bio_pic *acpi_pchpic[MAX_IO_PICS];
126
127 extern struct fwnode_handle *cpuintc_handle;
128 extern struct fwnode_handle *liointc_handle;
129 extern struct fwnode_handle *pch_lpc_handle;
130 extern struct fwnode_handle *pch_pic_handle[MAX_IO_PICS];
131
get_percpu_irq(int vector)132 static 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 */
146