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-rw-r--r--arch/loongarch/include/asm/irq.h124
1 files changed, 124 insertions, 0 deletions
diff --git a/arch/loongarch/include/asm/irq.h b/arch/loongarch/include/asm/irq.h
new file mode 100644
index 0000000000..218b4da0ea
--- /dev/null
+++ b/arch/loongarch/include/asm/irq.h
@@ -0,0 +1,124 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+#ifndef _ASM_IRQ_H
+#define _ASM_IRQ_H
+
+#include <linux/irqdomain.h>
+#include <linux/irqreturn.h>
+
+#define IRQ_STACK_SIZE THREAD_SIZE
+#define IRQ_STACK_START (IRQ_STACK_SIZE - 16)
+
+DECLARE_PER_CPU(unsigned long, irq_stack);
+
+/*
+ * The highest address on the IRQ stack contains a dummy frame which is
+ * structured as follows:
+ *
+ * top ------------
+ * | task sp | <- irq_stack[cpu] + IRQ_STACK_START
+ * ------------
+ * | | <- First frame of IRQ context
+ * ------------
+ *
+ * task sp holds a copy of the task stack pointer where the struct pt_regs
+ * from exception entry can be found.
+ */
+
+static inline bool on_irq_stack(int cpu, unsigned long sp)
+{
+ unsigned long low = per_cpu(irq_stack, cpu);
+ unsigned long high = low + IRQ_STACK_SIZE;
+
+ return (low <= sp && sp <= high);
+}
+
+void spurious_interrupt(void);
+
+#define NR_IRQS_LEGACY 16
+
+#define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
+void arch_trigger_cpumask_backtrace(const struct cpumask *mask, int exclude_cpu);
+
+#define MAX_IO_PICS 2
+#define NR_IRQS (64 + (256 * MAX_IO_PICS))
+
+struct acpi_vector_group {
+ int node;
+ int pci_segment;
+ struct irq_domain *parent;
+};
+extern struct acpi_vector_group pch_group[MAX_IO_PICS];
+extern struct acpi_vector_group msi_group[MAX_IO_PICS];
+
+#define CORES_PER_EIO_NODE 4
+
+#define LOONGSON_CPU_UART0_VEC 10 /* CPU UART0 */
+#define LOONGSON_CPU_THSENS_VEC 14 /* CPU Thsens */
+#define LOONGSON_CPU_HT0_VEC 16 /* CPU HT0 irq vector base number */
+#define LOONGSON_CPU_HT1_VEC 24 /* CPU HT1 irq vector base number */
+
+/* IRQ number definitions */
+#define LOONGSON_LPC_IRQ_BASE 0
+#define LOONGSON_LPC_LAST_IRQ (LOONGSON_LPC_IRQ_BASE + 15)
+
+#define LOONGSON_CPU_IRQ_BASE 16
+#define LOONGSON_CPU_LAST_IRQ (LOONGSON_CPU_IRQ_BASE + 14)
+
+#define LOONGSON_PCH_IRQ_BASE 64
+#define LOONGSON_PCH_ACPI_IRQ (LOONGSON_PCH_IRQ_BASE + 47)
+#define LOONGSON_PCH_LAST_IRQ (LOONGSON_PCH_IRQ_BASE + 64 - 1)
+
+#define LOONGSON_MSI_IRQ_BASE (LOONGSON_PCH_IRQ_BASE + 64)
+#define LOONGSON_MSI_LAST_IRQ (LOONGSON_PCH_IRQ_BASE + 256 - 1)
+
+#define GSI_MIN_LPC_IRQ LOONGSON_LPC_IRQ_BASE
+#define GSI_MAX_LPC_IRQ (LOONGSON_LPC_IRQ_BASE + 16 - 1)
+#define GSI_MIN_CPU_IRQ LOONGSON_CPU_IRQ_BASE
+#define GSI_MAX_CPU_IRQ (LOONGSON_CPU_IRQ_BASE + 48 - 1)
+#define GSI_MIN_PCH_IRQ LOONGSON_PCH_IRQ_BASE
+#define GSI_MAX_PCH_IRQ (LOONGSON_PCH_IRQ_BASE + 256 - 1)
+
+struct acpi_madt_lio_pic;
+struct acpi_madt_eio_pic;
+struct acpi_madt_ht_pic;
+struct acpi_madt_bio_pic;
+struct acpi_madt_msi_pic;
+struct acpi_madt_lpc_pic;
+
+int liointc_acpi_init(struct irq_domain *parent,
+ struct acpi_madt_lio_pic *acpi_liointc);
+int eiointc_acpi_init(struct irq_domain *parent,
+ struct acpi_madt_eio_pic *acpi_eiointc);
+
+int htvec_acpi_init(struct irq_domain *parent,
+ struct acpi_madt_ht_pic *acpi_htvec);
+int pch_lpc_acpi_init(struct irq_domain *parent,
+ struct acpi_madt_lpc_pic *acpi_pchlpc);
+int pch_msi_acpi_init(struct irq_domain *parent,
+ struct acpi_madt_msi_pic *acpi_pchmsi);
+int pch_pic_acpi_init(struct irq_domain *parent,
+ struct acpi_madt_bio_pic *acpi_pchpic);
+int find_pch_pic(u32 gsi);
+struct fwnode_handle *get_pch_msi_handle(int pci_segment);
+
+extern struct acpi_madt_lio_pic *acpi_liointc;
+extern struct acpi_madt_eio_pic *acpi_eiointc[MAX_IO_PICS];
+
+extern struct acpi_madt_ht_pic *acpi_htintc;
+extern struct acpi_madt_lpc_pic *acpi_pchlpc;
+extern struct acpi_madt_msi_pic *acpi_pchmsi[MAX_IO_PICS];
+extern struct acpi_madt_bio_pic *acpi_pchpic[MAX_IO_PICS];
+
+extern struct fwnode_handle *cpuintc_handle;
+extern struct fwnode_handle *liointc_handle;
+extern struct fwnode_handle *pch_lpc_handle;
+extern struct fwnode_handle *pch_pic_handle[MAX_IO_PICS];
+
+extern irqreturn_t loongson_ipi_interrupt(int irq, void *dev);
+
+#include <asm-generic/irq.h>
+
+#endif /* _ASM_IRQ_H */