174 lines
4.0 KiB
C
174 lines
4.0 KiB
C
/*
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* Copyright (c) 2014 Wind River Systems, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief ARCv2 interrupt management
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*
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*
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* Interrupt management:
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*
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* - enabling/disabling
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*
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* An IRQ number passed to the @a irq parameters found in this file is a
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* number from 16 to last IRQ number on the platform.
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*/
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#include <kernel.h>
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#include <arch/cpu.h>
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#include <sys/__assert.h>
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#include <toolchain.h>
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#include <linker/sections.h>
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#include <sw_isr_table.h>
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#include <irq.h>
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#include <sys/printk.h>
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/*
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* storage space for the interrupt stack of fast_irq
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*/
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#if defined(CONFIG_ARC_FIRQ_STACK)
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#if defined(CONFIG_SMP)
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K_KERNEL_STACK_ARRAY_DEFINE(_firq_interrupt_stack, CONFIG_MP_NUM_CPUS,
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CONFIG_ARC_FIRQ_STACK_SIZE);
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#else
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K_KERNEL_STACK_DEFINE(_firq_interrupt_stack, CONFIG_ARC_FIRQ_STACK_SIZE);
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#endif
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/**
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* @brief Set the stack pointer for firq handling
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*/
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void z_arc_firq_stack_set(void)
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{
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#ifdef CONFIG_SMP
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char *firq_sp = Z_KERNEL_STACK_BUFFER(
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_firq_interrupt_stack[z_arc_v2_core_id()]) +
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CONFIG_ARC_FIRQ_STACK_SIZE;
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#else
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char *firq_sp = Z_KERNEL_STACK_BUFFER(_firq_interrupt_stack) +
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CONFIG_ARC_FIRQ_STACK_SIZE;
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#endif
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/* the z_arc_firq_stack_set must be called when irq diasbled, as
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* it can be called not only in the init phase but also other places
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*/
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unsigned int key = arch_irq_lock();
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__asm__ volatile (
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/* only ilink will not be banked, so use ilink as channel
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* between 2 banks
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*/
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"mov %%ilink, %0\n\t"
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"lr %0, [%1]\n\t"
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"or %0, %0, %2\n\t"
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"kflag %0\n\t"
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"mov %%sp, %%ilink\n\t"
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/* switch back to bank0, use ilink to avoid the pollution of
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* bank1's gp regs.
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*/
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"lr %%ilink, [%1]\n\t"
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"and %%ilink, %%ilink, %3\n\t"
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"kflag %%ilink\n\t"
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:
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: "r"(firq_sp), "i"(_ARC_V2_STATUS32),
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"i"(_ARC_V2_STATUS32_RB(1)),
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"i"(~_ARC_V2_STATUS32_RB(7))
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);
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arch_irq_unlock(key);
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}
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#endif
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/**
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* @brief Enable an interrupt line
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*
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* Clear possible pending interrupts on the line, and enable the interrupt
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* line. After this call, the CPU will receive interrupts for the specified
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* @a irq.
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*/
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void arch_irq_enable(unsigned int irq)
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{
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z_arc_v2_irq_unit_int_enable(irq);
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}
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/**
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* @brief Disable an interrupt line
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*
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* Disable an interrupt line. After this call, the CPU will stop receiving
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* interrupts for the specified @a irq.
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*/
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void arch_irq_disable(unsigned int irq)
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{
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z_arc_v2_irq_unit_int_disable(irq);
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}
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/**
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* @brief Return IRQ enable state
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*
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* @param irq IRQ line
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* @return interrupt enable state, true or false
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*/
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int arch_irq_is_enabled(unsigned int irq)
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{
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return z_arc_v2_irq_unit_int_enabled(irq);
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}
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/**
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* @internal
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*
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* @brief Set an interrupt's priority
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*
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* Lower values take priority over higher values. Special case priorities are
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* expressed via mutually exclusive flags.
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* The priority is verified if ASSERT_ON is enabled; max priority level
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* depends on CONFIG_NUM_IRQ_PRIO_LEVELS.
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*/
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void z_irq_priority_set(unsigned int irq, unsigned int prio, uint32_t flags)
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{
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ARG_UNUSED(flags);
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__ASSERT(prio < CONFIG_NUM_IRQ_PRIO_LEVELS,
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"invalid priority %d for irq %d", prio, irq);
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/* 0 -> CONFIG_NUM_IRQ_PRIO_LEVELS allocated to secure world
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* left prio levels allocated to normal world
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*/
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#if defined(CONFIG_ARC_SECURE_FIRMWARE)
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prio = prio < ARC_N_IRQ_START_LEVEL ?
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prio : (ARC_N_IRQ_START_LEVEL - 1);
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#elif defined(CONFIG_ARC_NORMAL_FIRMWARE)
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prio = prio < ARC_N_IRQ_START_LEVEL ?
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ARC_N_IRQ_START_LEVEL : prio;
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#endif
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z_arc_v2_irq_unit_prio_set(irq, prio);
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}
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/**
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* @brief Spurious interrupt handler
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*
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* Installed in all dynamic interrupt slots at boot time. Throws an error if
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* called.
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*/
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void z_irq_spurious(const void *unused)
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{
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ARG_UNUSED(unused);
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z_fatal_error(K_ERR_SPURIOUS_IRQ, NULL);
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}
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#ifdef CONFIG_DYNAMIC_INTERRUPTS
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int arch_irq_connect_dynamic(unsigned int irq, unsigned int priority,
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void (*routine)(const void *parameter),
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const void *parameter, uint32_t flags)
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{
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z_isr_install(irq, routine, parameter);
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z_irq_priority_set(irq, priority, flags);
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return irq;
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}
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#endif /* CONFIG_DYNAMIC_INTERRUPTS */
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