Loongson-3A5000 support 14 interrupts from 64 - 77(Timer->75 IPI->76) Loongson-3A5000 and ls7a form a legacy model and extended model irq hierarchy.Tcg mode emulate a simplified extended model which has no Legacy I/O Interrupt Controller(LIOINTC) and LPC. e.g:
| +-----+ +---------+ +-------+ | | | IPI |--> | CPUINTC | <-- | Timer | | | +-----+ +---------+ +-------+ | | ^ | | | | | +---------+ | | EIOINTC | | +---------+ | ^ ^ | | | | | | +---------+ +---------+ | | | PCH-PIC | | PCH-MSI | | | +---------+ +---------+ | | ^ ^ ^ | | | | | | | +---------+ +---------+ +---------+ | | | UARTs | | Devices | | Devices | | | +---------+ +---------+ +---------+ | | ^ | The following series patch will realize the interrupt controller in this model. More detailed info can be found at the kernel doc or manual 1.https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/ linux-loongson.git/tree/Documentation/loongarch?h=loongarch-next 2.https://github.com/loongson/LoongArch-Documentation Signed-off-by: Xiaojuan Yang <yangxiaoj...@loongson.cn> Signed-off-by: Song Gao <gaos...@loongson.cn> --- hw/loongarch/loongarch_int.c | 59 ++++++++++++++++++++++++++++++++ hw/loongarch/ls3a5000_virt.c | 2 ++ hw/loongarch/meson.build | 1 + include/hw/loongarch/loongarch.h | 2 ++ 4 files changed, 64 insertions(+) create mode 100644 hw/loongarch/loongarch_int.c diff --git a/hw/loongarch/loongarch_int.c b/hw/loongarch/loongarch_int.c new file mode 100644 index 0000000000..2502d056ac --- /dev/null +++ b/hw/loongarch/loongarch_int.c @@ -0,0 +1,59 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * QEMU LOONGARCH interrupt support + * + * Copyright (C) 2021 Loongson Technology Corporation Limited + */ + +#include "qemu/osdep.h" +#include "qemu/main-loop.h" +#include "hw/irq.h" +#include "hw/loongarch/loongarch.h" +#include "cpu.h" + +static void cpu_loongarch_irq_request(void *opaque, int irq, int level) +{ + LoongArchCPU *cpu = opaque; + CPULoongArchState *env = &cpu->env; + CPUState *cs = CPU(cpu); + bool locked = false; + + if (irq < 0 || irq > N_IRQS) { + return; + } + + /* Make sure locking works even if BQL is already held by the caller */ + if (!qemu_mutex_iothread_locked()) { + locked = true; + qemu_mutex_lock_iothread(); + } + + if (level) { + env->CSR_ESTAT |= 1 << irq; + } else { + env->CSR_ESTAT &= ~(1 << irq); + } + + if (FIELD_EX64(env->CSR_ESTAT, CSR_ESTAT, IS)) { + cpu_interrupt(cs, CPU_INTERRUPT_HARD); + } else { + cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD); + } + + if (locked) { + qemu_mutex_unlock_iothread(); + } +} + +void cpu_loongarch_init_irq(LoongArchCPU *cpu) +{ + CPULoongArchState *env = &cpu->env; + qemu_irq *qi; + int i; + + qi = qemu_allocate_irqs(cpu_loongarch_irq_request, cpu, N_IRQS); + for (i = 0; i < N_IRQS; i++) { + env->irq[i] = qi[i]; + } + g_free(qi); +} diff --git a/hw/loongarch/ls3a5000_virt.c b/hw/loongarch/ls3a5000_virt.c index 7c88d64795..37d6b1ec88 100644 --- a/hw/loongarch/ls3a5000_virt.c +++ b/hw/loongarch/ls3a5000_virt.c @@ -150,6 +150,8 @@ static void ls3a5000_virt_init(MachineState *machine) env = &cpu->env; cpu_states[i] = env; + /* Init CPU internal devices */ + cpu_loongarch_init_irq(cpu); cpu_loongarch_clock_init(cpu); qemu_register_reset(main_cpu_reset, cpu); } diff --git a/hw/loongarch/meson.build b/hw/loongarch/meson.build index 1e743cadb8..a972210680 100644 --- a/hw/loongarch/meson.build +++ b/hw/loongarch/meson.build @@ -1,4 +1,5 @@ loongarch_ss = ss.source_set() +loongarch_ss.add(files('loongarch_int.c')) loongarch_ss.add(when: 'CONFIG_LOONGSON_3A5000', if_true: files('ls3a5000_virt.c')) hw_arch += {'loongarch': loongarch_ss} diff --git a/include/hw/loongarch/loongarch.h b/include/hw/loongarch/loongarch.h index edab069f76..8538697e5f 100644 --- a/include/hw/loongarch/loongarch.h +++ b/include/hw/loongarch/loongarch.h @@ -43,4 +43,6 @@ typedef struct LoongArchMachineState { #define TYPE_LOONGARCH_MACHINE MACHINE_TYPE_NAME("loongson7a") DECLARE_INSTANCE_CHECKER(LoongArchMachineState, LOONGARCH_MACHINE, TYPE_LOONGARCH_MACHINE) + +void cpu_loongarch_init_irq(LoongArchCPU *cpu); #endif -- 2.27.0
