arch/loongarch/include/asm/irq.h

   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 #define IRQ_MATRIX_BITS         NR_VECTORS
  52
  53 #define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
  54 void arch_trigger_cpumask_backtrace(const struct cpumask *mask, int exclude_cpu);
  55
  56 #define MAX_IO_PICS 2
  57 #define NR_IRQS (64 + NR_VECTORS * (NR_CPUS + MAX_IO_PICS))
  58
  59 struct acpi_vector_group {
  60         int node;
  61         int pci_segment;
  62         struct irq_domain *parent;
  63 };
  64 extern struct acpi_vector_group pch_group[MAX_IO_PICS];
  65 extern struct acpi_vector_group msi_group[MAX_IO_PICS];
  66
  67 #define CORES_PER_EIO_NODE      4
  68 #define CORES_PER_VEIO_NODE     256
  69
  70 #define LOONGSON_CPU_UART0_VEC          10 /* CPU UART0 */
  71 #define LOONGSON_CPU_THSENS_VEC         14 /* CPU Thsens */
  72 #define LOONGSON_CPU_HT0_VEC            16 /* CPU HT0 irq vector base number */
  73 #define LOONGSON_CPU_HT1_VEC            24 /* CPU HT1 irq vector base number */
  74
  75 /* IRQ number definitions */
  76 #define LOONGSON_LPC_IRQ_BASE           0
  77 #define LOONGSON_LPC_LAST_IRQ           (LOONGSON_LPC_IRQ_BASE + 15)
  78
  79 #define LOONGSON_CPU_IRQ_BASE           16
  80 #define LOONGSON_CPU_LAST_IRQ           (LOONGSON_CPU_IRQ_BASE + 15)
  81
  82 #define LOONGSON_PCH_IRQ_BASE           64
  83 #define LOONGSON_PCH_ACPI_IRQ           (LOONGSON_PCH_IRQ_BASE + 47)
  84 #define LOONGSON_PCH_LAST_IRQ           (LOONGSON_PCH_IRQ_BASE + 64 - 1)
  85
  86 #define LOONGSON_MSI_IRQ_BASE           (LOONGSON_PCH_IRQ_BASE + 64)
  87 #define LOONGSON_MSI_LAST_IRQ           (LOONGSON_PCH_IRQ_BASE + 256 - 1)
  88
  89 #define GSI_MIN_LPC_IRQ         LOONGSON_LPC_IRQ_BASE
  90 #define GSI_MAX_LPC_IRQ         (LOONGSON_LPC_IRQ_BASE + 16 - 1)
  91 #define GSI_MIN_CPU_IRQ         LOONGSON_CPU_IRQ_BASE
  92 #define GSI_MAX_CPU_IRQ         (LOONGSON_CPU_IRQ_BASE + 48 - 1)
  93 #define GSI_MIN_PCH_IRQ         LOONGSON_PCH_IRQ_BASE
  94 #define GSI_MAX_PCH_IRQ         (LOONGSON_PCH_IRQ_BASE + 256 - 1)
  95
  96 struct acpi_madt_lio_pic;
  97 struct acpi_madt_eio_pic;
  98 struct acpi_madt_ht_pic;
  99 struct acpi_madt_bio_pic;
 100 struct acpi_madt_msi_pic;
 101 struct acpi_madt_lpc_pic;
 102
 103 void complete_irq_moving(void);
 104
 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 */