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/******************************************************************************
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* *
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* License Agreement *
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* *
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* Copyright (c) 2009 Altera Corporation, San Jose, California, USA. *
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* All rights reserved. *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a *
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* copy of this software and associated documentation files (the "Software"), *
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* to deal in the Software without restriction, including without limitation *
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* the rights to use, copy, modify, merge, publish, distribute, sublicense, *
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* and/or sell copies of the Software, and to permit persons to whom the *
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* Software is furnished to do so, subject to the following conditions: *
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* *
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* The above copyright notice and this permission notice shall be included in *
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* all copies or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *
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* DEALINGS IN THE SOFTWARE. *
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* *
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* This agreement shall be governed in all respects by the laws of the State *
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* of California and by the laws of the United States of America. *
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* *
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******************************************************************************/
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#include "system.h"
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/*
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* This file implements the HAL Enhanced interrupt API for Nios II processors
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* with an internal interrupt controller (IIC). For most routines, this serves
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* as a wrapper layer over the legacy interrupt API (which must be used with
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* the IIC only).
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*
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* Use of the enhanced API is recommended so that application and device
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* drivers are compatible with a Nios II system configured with an external
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* interrupt controller (EIC), or IIC. This will afford maximum portability.
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*
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* If an EIC is present, the EIC device driver must provide these routines,
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* because their operation will be specific to that EIC type.
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*/
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#ifndef NIOS2_EIC_PRESENT
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#ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT
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#include "sys/alt_irq.h"
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#include "priv/alt_iic_isr_register.h"
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#include "priv/alt_legacy_irq.h"
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/** @Function Description: This function registers an interrupt handler.
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* If the function is succesful, then the requested interrupt will be enabled upon
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* return. Registering a NULL handler will disable the interrupt.
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* @API Type: External
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* @param ic_id Ignored.
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* @param irq IRQ number
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* @return 0 if successful, else error (-1)
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*/
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int alt_ic_isr_register(alt_u32 ic_id, alt_u32 irq, alt_isr_func isr,
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void *isr_context, void *flags)
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{
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return alt_iic_isr_register(ic_id, irq, isr, isr_context, flags);
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}
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/** @Function Description: This function enables a single interrupt.
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* @API Type: External
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* @param ic_id Ignored.
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* @param irq IRQ number
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* @return 0 if successful, else error (-1)
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*/
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int alt_ic_irq_enable (alt_u32 ic_id, alt_u32 irq)
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{
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return alt_irq_enable(irq);
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}
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/** @Function Description: This function disables a single interrupt.
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* @API Type: External
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* @param ic_id Ignored.
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* @param irq IRQ number
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* @return 0 if successful, else error (-1)
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*/
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int alt_ic_irq_disable(alt_u32 ic_id, alt_u32 irq)
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{
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return alt_irq_disable(irq);
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}
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/** @Function Description: This function to determine if corresponding
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* interrupt is enabled.
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* @API Type: External
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* @param ic_id Ignored.
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* @param irq IRQ number
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* @return Zero if corresponding interrupt is disabled and
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* non-zero otherwise.
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*/
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alt_u32 alt_ic_irq_enabled(alt_u32 ic_id, alt_u32 irq)
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{
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alt_u32 irq_enabled;
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NIOS2_READ_IENABLE(irq_enabled);
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return (irq_enabled & (1 << irq)) ? 1: 0;
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}
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#endif /* ALT_ENHANCED_INTERRUPT_API_PRESENT */
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#endif /* NIOS2_EIC_PRESENT */
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