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
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 #define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
43 void 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
48 struct acpi_vector_group {
49 int node;
50 int pci_segment;
51 struct irq_domain *parent;
52 };
53 extern struct acpi_vector_group pch_group[MAX_IO_PICS];
54 extern 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
84 struct acpi_madt_lio_pic;
85 struct acpi_madt_eio_pic;
86 struct acpi_madt_ht_pic;
87 struct acpi_madt_bio_pic;
88 struct acpi_madt_msi_pic;
89 struct acpi_madt_lpc_pic;
90
91 int liointc_acpi_init(struct irq_domain *parent,
92 struct acpi_madt_lio_pic *acpi_liointc);
93 int eiointc_acpi_init(struct irq_domain *parent,
94 struct acpi_madt_eio_pic *acpi_eiointc);
95
96 int htvec_acpi_init(struct irq_domain *parent,
97 struct acpi_madt_ht_pic *acpi_htvec);
98 int pch_lpc_acpi_init(struct irq_domain *parent,
99 struct acpi_madt_lpc_pic *acpi_pchlpc);
100 int pch_msi_acpi_init(struct irq_domain *parent,
101 struct acpi_madt_msi_pic *acpi_pchmsi);
102 int pch_pic_acpi_init(struct irq_domain *parent,
103 struct acpi_madt_bio_pic *acpi_pchpic);
104 int find_pch_pic(u32 gsi);
105 struct fwnode_handle *get_pch_msi_handle(int pci_segment);
106
107 extern struct acpi_madt_lio_pic *acpi_liointc;
108 extern struct acpi_madt_eio_pic *acpi_eiointc[MAX_IO_PICS];
109
110 extern struct acpi_madt_ht_pic *acpi_htintc;
111 extern struct acpi_madt_lpc_pic *acpi_pchlpc;
112 extern struct acpi_madt_msi_pic *acpi_pchmsi[MAX_IO_PICS];
113 extern struct acpi_madt_bio_pic *acpi_pchpic[MAX_IO_PICS];
114
115 extern struct fwnode_handle *cpuintc_handle;
116 extern struct fwnode_handle *liointc_handle;
117 extern struct fwnode_handle *pch_lpc_handle;
118 extern struct fwnode_handle *pch_pic_handle[MAX_IO_PICS];
119
120 static inline int get_percpu_irq(int vector)
121 {
122 struct irq_domain *d;
123
124 d = irq_find_matching_fwnode(cpuintc_handle, DOMAIN_BUS_ANY);
125 if (d)
126 return irq_create_mapping(d, vector);
127
128 return -EINVAL;
129 }
130
131 #include <asm-generic/irq.h>
132
133 #endif /* _ASM_IRQ_H */
134
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