| /* |
| * Copyright (c) 2017 Jean-Paul Etienne <fractalclone@gmail.com> |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| /** |
| * @file |
| * @brief interrupt management code for riscv SOCs supporting the riscv |
| privileged architecture specification |
| */ |
| #include <irq.h> |
| |
| /** |
| * @brief Get an IRQ's level |
| * @param irq The IRQ number in the Zephyr irq.h numbering system |
| * @return IRQ level, either 1 or 2 |
| */ |
| static inline unsigned int _irq_level(unsigned int irq) |
| { |
| return ((irq >> 8) & 0xff) == 0U ? 1 : 2; |
| } |
| |
| static inline unsigned int _level2_irq(unsigned int irq) |
| { |
| return (irq >> 8) - 1; |
| } |
| |
| void arch_irq_enable(unsigned int irq) |
| { |
| u32_t mie; |
| |
| #if defined(CONFIG_RISCV_HAS_PLIC) |
| unsigned int level = _irq_level(irq); |
| |
| if (level == 2) { |
| irq = _level2_irq(irq); |
| riscv_plic_irq_enable(irq); |
| return; |
| } |
| #endif |
| |
| /* |
| * CSR mie register is updated using atomic instruction csrrs |
| * (atomic read and set bits in CSR register) |
| */ |
| __asm__ volatile ("csrrs %0, mie, %1\n" |
| : "=r" (mie) |
| : "r" (1 << irq)); |
| } |
| |
| void arch_irq_disable(unsigned int irq) |
| { |
| u32_t mie; |
| |
| #if defined(CONFIG_RISCV_HAS_PLIC) |
| unsigned int level = _irq_level(irq); |
| |
| if (level == 2) { |
| irq = _level2_irq(irq); |
| riscv_plic_irq_disable(irq); |
| return; |
| } |
| #endif |
| |
| /* |
| * Use atomic instruction csrrc to disable device interrupt in mie CSR. |
| * (atomic read and clear bits in CSR register) |
| */ |
| __asm__ volatile ("csrrc %0, mie, %1\n" |
| : "=r" (mie) |
| : "r" (1 << irq)); |
| }; |
| |
| void arch_irq_priority_set(unsigned int irq, unsigned int prio) |
| { |
| #if defined(CONFIG_RISCV_HAS_PLIC) |
| unsigned int level = _irq_level(irq); |
| |
| if (level == 2) { |
| irq = _level2_irq(irq); |
| riscv_plic_set_priority(irq, prio); |
| } |
| #endif |
| |
| return ; |
| } |
| |
| int arch_irq_is_enabled(unsigned int irq) |
| { |
| u32_t mie; |
| |
| #if defined(CONFIG_RISCV_HAS_PLIC) |
| unsigned int level = _irq_level(irq); |
| |
| if (level == 2) { |
| irq = _level2_irq(irq); |
| return riscv_plic_irq_is_enabled(irq); |
| } |
| #endif |
| |
| __asm__ volatile ("csrr %0, mie" : "=r" (mie)); |
| |
| return !!(mie & (1 << irq)); |
| } |
| |
| #if defined(CONFIG_RISCV_SOC_INTERRUPT_INIT) |
| void soc_interrupt_init(void) |
| { |
| /* ensure that all interrupts are disabled */ |
| (void)irq_lock(); |
| |
| __asm__ volatile ("csrwi mie, 0\n" |
| "csrwi mip, 0\n"); |
| } |
| #endif |