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 /* 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 52 #define AVEC_IRQ_SHIFT 4 53 #define AVEC_IRQ_BIT 8 54 #define AVEC_IRQ_MASK GENMASK(AVEC_IRQ_BIT - 1, 0) 55 #define AVEC_CPU_SHIFT 12 56 #define AVEC_CPU_BIT 16 57 #define AVEC_CPU_MASK GENMASK(AVEC_CPU_BIT - 1, 0) 58 59 #define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace 60 void arch_trigger_cpumask_backtrace(const struct cpumask *mask, int exclude_cpu); 61 62 #ifdef CONFIG_32BIT 63 #define MAX_IO_PICS 1 64 #else 65 #define MAX_IO_PICS 8 66 #endif 67 68 #define NR_IRQS (64 + NR_VECTORS * (NR_CPUS + MAX_IO_PICS)) 69 70 struct acpi_vector_group { 71 int node; 72 int pci_segment; 73 struct irq_domain *parent; 74 }; 75 extern struct acpi_vector_group pch_group[MAX_IO_PICS]; 76 extern struct acpi_vector_group msi_group[MAX_IO_PICS]; 77 78 #define CORES_PER_EIO_NODE 4 79 #define CORES_PER_VEIO_NODE 256 80 81 #define LOONGSON_CPU_UART0_VEC 10 /* CPU UART0 */ 82 #define LOONGSON_CPU_THSENS_VEC 14 /* CPU Thsens */ 83 #define LOONGSON_CPU_HT0_VEC 16 /* CPU HT0 irq vector base number */ 84 #define LOONGSON_CPU_HT1_VEC 24 /* CPU HT1 irq vector base number */ 85 86 /* IRQ number definitions */ 87 #define LOONGSON_LPC_IRQ_BASE 0 88 #define LOONGSON_LPC_LAST_IRQ (LOONGSON_LPC_IRQ_BASE + 15) 89 90 #define LOONGSON_CPU_IRQ_BASE 16 91 #define LOONGSON_CPU_LAST_IRQ (LOONGSON_CPU_IRQ_BASE + 15) 92 93 #define LOONGSON_PCH_IRQ_BASE 64 94 #define LOONGSON_PCH_ACPI_IRQ (LOONGSON_PCH_IRQ_BASE + 47) 95 #define LOONGSON_PCH_LAST_IRQ (LOONGSON_PCH_IRQ_BASE + 64 - 1) 96 97 #define LOONGSON_MSI_IRQ_BASE (LOONGSON_PCH_IRQ_BASE + 64) 98 #define LOONGSON_MSI_LAST_IRQ (LOONGSON_PCH_IRQ_BASE + 256 - 1) 99 100 #define GSI_MIN_LPC_IRQ LOONGSON_LPC_IRQ_BASE 101 #define GSI_MAX_LPC_IRQ (LOONGSON_LPC_IRQ_BASE + 16 - 1) 102 #define GSI_MIN_CPU_IRQ LOONGSON_CPU_IRQ_BASE 103 #define GSI_MAX_CPU_IRQ (LOONGSON_CPU_IRQ_BASE + 48 - 1) 104 #define GSI_MIN_PCH_IRQ LOONGSON_PCH_IRQ_BASE 105 #define GSI_MAX_PCH_IRQ (LOONGSON_PCH_IRQ_BASE + 256 - 1) 106 107 struct acpi_madt_lio_pic; 108 struct acpi_madt_eio_pic; 109 struct acpi_madt_ht_pic; 110 struct acpi_madt_bio_pic; 111 struct acpi_madt_msi_pic; 112 struct acpi_madt_lpc_pic; 113 114 void complete_irq_moving(void); 115 116 struct fwnode_handle *get_pch_msi_handle(int pci_segment); 117 118 extern struct acpi_madt_lio_pic *acpi_liointc; 119 extern struct acpi_madt_eio_pic *acpi_eiointc[MAX_IO_PICS]; 120 121 extern struct acpi_madt_ht_pic *acpi_htintc; 122 extern struct acpi_madt_lpc_pic *acpi_pchlpc; 123 extern struct acpi_madt_msi_pic *acpi_pchmsi[MAX_IO_PICS]; 124 extern struct acpi_madt_bio_pic *acpi_pchpic[MAX_IO_PICS]; 125 126 extern struct fwnode_handle *cpuintc_handle; 127 extern struct fwnode_handle *liointc_handle; 128 extern struct fwnode_handle *pch_lpc_handle; 129 extern struct fwnode_handle *pch_pic_handle[MAX_IO_PICS]; 130 131 static inline int get_percpu_irq(int vector) 132 { 133 struct irq_domain *d; 134 135 d = irq_find_matching_fwnode(cpuintc_handle, DOMAIN_BUS_ANY); 136 if (d) 137 return irq_create_mapping(d, vector); 138 139 return -EINVAL; 140 } 141 142 #include <asm-generic/irq.h> 143 144 #endif /* _ASM_IRQ_H */ 145