| #ifndef __ALT_LEGACY_IRQ_H__ |
| #define __ALT_LEGACY_IRQ_H__ |
| |
| /****************************************************************************** |
| * * |
| * License Agreement * |
| * * |
| * Copyright (c) 2009 Altera Corporation, San Jose, California, USA. * |
| * All rights reserved. * |
| * * |
| * Permission is hereby granted, free of charge, to any person obtaining a * |
| * copy of this software and associated documentation files (the "Software"), * |
| * to deal in the Software without restriction, including without limitation * |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, * |
| * and/or sell copies of the Software, and to permit persons to whom the * |
| * Software is furnished to do so, subject to the following conditions: * |
| * * |
| * The above copyright notice and this permission notice shall be included in * |
| * all copies or substantial portions of the Software. * |
| * * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * |
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * |
| * DEALINGS IN THE SOFTWARE. * |
| * * |
| * * |
| ******************************************************************************/ |
| |
| /* |
| * This file provides prototypes and inline implementations of certain routines |
| * used by the legacy interrupt API. Do not include this in your driver or |
| * application source files, use "sys/alt_irq.h" instead to access the proper |
| * public API. |
| */ |
| |
| #include <errno.h> |
| #include "system.h" |
| |
| #ifndef NIOS2_EIC_PRESENT |
| |
| #include "nios2.h" |
| #include "alt_types.h" |
| |
| #include "sys/alt_irq.h" |
| |
| #ifdef __cplusplus |
| extern "C" |
| { |
| #endif /* __cplusplus */ |
| |
| /* |
| * alt_irq_register() can be used to register an interrupt handler. If the |
| * function is succesful, then the requested interrupt will be enabled upon |
| * return. |
| */ |
| extern int alt_irq_register (alt_u32 id, |
| void* context, |
| alt_isr_func handler); |
| |
| /* |
| * alt_irq_disable() disables the individual interrupt indicated by "id". |
| */ |
| static ALT_INLINE int ALT_ALWAYS_INLINE alt_irq_disable (alt_u32 id) |
| { |
| alt_irq_context status; |
| extern volatile alt_u32 alt_irq_active; |
| |
| status = alt_irq_disable_all (); |
| |
| alt_irq_active &= ~(1 << id); |
| NIOS2_WRITE_IENABLE (alt_irq_active); |
| |
| alt_irq_enable_all(status); |
| |
| return 0; |
| } |
| |
| /* |
| * alt_irq_enable() enables the individual interrupt indicated by "id". |
| */ |
| static ALT_INLINE int ALT_ALWAYS_INLINE alt_irq_enable (alt_u32 id) |
| { |
| alt_irq_context status; |
| extern volatile alt_u32 alt_irq_active; |
| |
| status = alt_irq_disable_all (); |
| |
| alt_irq_active |= (1 << id); |
| NIOS2_WRITE_IENABLE (alt_irq_active); |
| |
| alt_irq_enable_all(status); |
| |
| return 0; |
| } |
| |
| #ifndef ALT_EXCEPTION_STACK |
| /* |
| * alt_irq_initerruptable() should only be called from within an ISR. It is used |
| * to allow higer priority interrupts to interrupt the current ISR. The input |
| * argument, "priority", is the priority, i.e. interrupt number of the current |
| * interrupt. |
| * |
| * If this function is called, then the ISR is required to make a call to |
| * alt_irq_non_interruptible() before returning. The input argument to |
| * alt_irq_non_interruptible() is the return value from alt_irq_interruptible(). |
| * |
| * Care should be taken when using this pair of functions, since they increasing |
| * the system overhead associated with interrupt handling. |
| * |
| * If you are using an exception stack then nested interrupts won't work, so |
| * these functions are not available in that case. |
| */ |
| static ALT_INLINE alt_u32 ALT_ALWAYS_INLINE alt_irq_interruptible (alt_u32 priority) |
| { |
| extern volatile alt_u32 alt_priority_mask; |
| extern volatile alt_u32 alt_irq_active; |
| |
| alt_u32 old_priority; |
| |
| old_priority = alt_priority_mask; |
| alt_priority_mask = (1 << priority) - 1; |
| |
| NIOS2_WRITE_IENABLE (alt_irq_active & alt_priority_mask); |
| |
| NIOS2_WRITE_STATUS (1); |
| |
| return old_priority; |
| } |
| |
| /* |
| * See Comments above for alt_irq_interruptible() for an explanation of the use of this |
| * function. |
| */ |
| static ALT_INLINE void ALT_ALWAYS_INLINE alt_irq_non_interruptible (alt_u32 mask) |
| { |
| extern volatile alt_u32 alt_priority_mask; |
| extern volatile alt_u32 alt_irq_active; |
| |
| NIOS2_WRITE_STATUS (0); |
| |
| alt_priority_mask = mask; |
| |
| NIOS2_WRITE_IENABLE (mask & alt_irq_active); |
| } |
| #endif /* ALT_EXCEPTION_STACK */ |
| |
| #ifdef __cplusplus |
| } |
| #endif /* __cplusplus */ |
| |
| #endif /* NIOS2_EIC_PRESENT */ |
| |
| #endif /* __ALT_LEGACY_IRQ_H__ */ |