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 #define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
43 void arch_trigger_cpumask_backtrace(const struct cpumask *mask, bool exclude_self);
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 extern irqreturn_t loongson_ipi_interrupt(int irq, void *dev);
121 
122 #include <asm-generic/irq.h>
123 
124 #endif /* _ASM_IRQ_H */
125