xref: /openbmc/linux/arch/loongarch/include/asm/irq.h (revision 173940b3)
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 int get_ipi_irq(void);
39 int get_pmc_irq(void);
40 int get_timer_irq(void);
41 void spurious_interrupt(void);
42 
43 #define NR_IRQS_LEGACY 16
44 
45 #define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
46 void arch_trigger_cpumask_backtrace(const struct cpumask *mask, bool exclude_self);
47 
48 #define MAX_IO_PICS 2
49 #define NR_IRQS	(64 + (256 * MAX_IO_PICS))
50 
51 #define CORES_PER_EIO_NODE	4
52 
53 #define LOONGSON_CPU_UART0_VEC		10 /* CPU UART0 */
54 #define LOONGSON_CPU_THSENS_VEC		14 /* CPU Thsens */
55 #define LOONGSON_CPU_HT0_VEC		16 /* CPU HT0 irq vector base number */
56 #define LOONGSON_CPU_HT1_VEC		24 /* CPU HT1 irq vector base number */
57 
58 /* IRQ number definitions */
59 #define LOONGSON_LPC_IRQ_BASE		0
60 #define LOONGSON_LPC_LAST_IRQ		(LOONGSON_LPC_IRQ_BASE + 15)
61 
62 #define LOONGSON_CPU_IRQ_BASE		16
63 #define LOONGSON_CPU_LAST_IRQ		(LOONGSON_CPU_IRQ_BASE + 14)
64 
65 #define LOONGSON_PCH_IRQ_BASE		64
66 #define LOONGSON_PCH_ACPI_IRQ		(LOONGSON_PCH_IRQ_BASE + 47)
67 #define LOONGSON_PCH_LAST_IRQ		(LOONGSON_PCH_IRQ_BASE + 64 - 1)
68 
69 #define LOONGSON_MSI_IRQ_BASE		(LOONGSON_PCH_IRQ_BASE + 64)
70 #define LOONGSON_MSI_LAST_IRQ		(LOONGSON_PCH_IRQ_BASE + 256 - 1)
71 
72 #define GSI_MIN_LPC_IRQ		LOONGSON_LPC_IRQ_BASE
73 #define GSI_MAX_LPC_IRQ		(LOONGSON_LPC_IRQ_BASE + 16 - 1)
74 #define GSI_MIN_CPU_IRQ		LOONGSON_CPU_IRQ_BASE
75 #define GSI_MAX_CPU_IRQ		(LOONGSON_CPU_IRQ_BASE + 48 - 1)
76 #define GSI_MIN_PCH_IRQ		LOONGSON_PCH_IRQ_BASE
77 #define GSI_MAX_PCH_IRQ		(LOONGSON_PCH_IRQ_BASE + 256 - 1)
78 
79 extern int find_pch_pic(u32 gsi);
80 extern int eiointc_get_node(int id);
81 
82 static inline void eiointc_enable(void)
83 {
84 	uint64_t misc;
85 
86 	misc = iocsr_read64(LOONGARCH_IOCSR_MISC_FUNC);
87 	misc |= IOCSR_MISC_FUNC_EXT_IOI_EN;
88 	iocsr_write64(misc, LOONGARCH_IOCSR_MISC_FUNC);
89 }
90 
91 struct acpi_madt_lio_pic;
92 struct acpi_madt_eio_pic;
93 struct acpi_madt_ht_pic;
94 struct acpi_madt_bio_pic;
95 struct acpi_madt_msi_pic;
96 struct acpi_madt_lpc_pic;
97 
98 struct irq_domain *loongarch_cpu_irq_init(void);
99 
100 struct irq_domain *liointc_acpi_init(struct irq_domain *parent,
101 					struct acpi_madt_lio_pic *acpi_liointc);
102 struct irq_domain *eiointc_acpi_init(struct irq_domain *parent,
103 					struct acpi_madt_eio_pic *acpi_eiointc);
104 
105 struct irq_domain *htvec_acpi_init(struct irq_domain *parent,
106 					struct acpi_madt_ht_pic *acpi_htvec);
107 struct irq_domain *pch_lpc_acpi_init(struct irq_domain *parent,
108 					struct acpi_madt_lpc_pic *acpi_pchlpc);
109 struct irq_domain *pch_msi_acpi_init(struct irq_domain *parent,
110 					struct acpi_madt_msi_pic *acpi_pchmsi);
111 struct irq_domain *pch_pic_acpi_init(struct irq_domain *parent,
112 					struct acpi_madt_bio_pic *acpi_pchpic);
113 
114 extern struct acpi_madt_lio_pic *acpi_liointc;
115 extern struct acpi_madt_eio_pic *acpi_eiointc[MAX_IO_PICS];
116 
117 extern struct acpi_madt_ht_pic *acpi_htintc;
118 extern struct acpi_madt_lpc_pic *acpi_pchlpc;
119 extern struct acpi_madt_msi_pic *acpi_pchmsi[MAX_IO_PICS];
120 extern struct acpi_madt_bio_pic *acpi_pchpic[MAX_IO_PICS];
121 
122 extern struct irq_domain *cpu_domain;
123 extern struct irq_domain *liointc_domain;
124 extern struct irq_domain *pch_lpc_domain;
125 extern struct irq_domain *pch_msi_domain[MAX_IO_PICS];
126 extern struct irq_domain *pch_pic_domain[MAX_IO_PICS];
127 
128 extern irqreturn_t loongson3_ipi_interrupt(int irq, void *dev);
129 
130 #include <asm-generic/irq.h>
131 
132 #endif /* _ASM_IRQ_H */
133