184 lines
7.3 KiB
C
184 lines
7.3 KiB
C
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/*
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* Copyright (c) 2011-2012, Freescale Semiconductor, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* o Redistributions of source code must retain the above copyright notice, this list
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* of conditions and the following disclaimer.
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*
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* o Redistributions in binary form must reproduce the above copyright notice, this
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* list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* o Neither the name of Freescale Semiconductor, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __GIC_H__
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#define __GIC_H__
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#include "sdk_types.h"
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//! @addtogroup gic
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//! @{
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////////////////////////////////////////////////////////////////////////////////
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// Definitions
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////////////////////////////////////////////////////////////////////////////////
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//! @brief Options for sending a software generated interrupt.
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//!
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//! These options are used for the @a filter_list parameter of the gic_send_sgi()
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//! function. They control how to select which CPUs that the interrupt is
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//! sent to.
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enum _gicd_sgi_filter
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{
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//! Forward the interrupt to the CPU interfaces specified in the @a target_list parameter.
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kGicSgiFilter_UseTargetList = 0,
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//! Forward the interrupt to all CPU interfaces except that of the processor that requested
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//! the interrupt.
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kGicSgiFilter_AllOtherCPUs = 1,
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//! Forward the interrupt only to the CPU interface of the processor that requested the
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//! interrupt.
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kGicSgiFilter_OnlyThisCPU = 2
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};
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////////////////////////////////////////////////////////////////////////////////
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// API
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////////////////////////////////////////////////////////////////////////////////
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#if defined(__cplusplus)
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extern "C" {
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#endif
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//! @name Initialization
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//@{
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//! @brief Init interrupt handling.
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//!
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//! This function is intended to be called only by the primary CPU init code, so it will
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//! only be called once during system bootup.
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//!
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//! Also inits the current CPU. You don't need to call gic_init_cpu() separately.
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//!
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//! @post The interrupt distributor and the current CPU interface are enabled. All interrupts
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//! that were pending are cleared, and all interrupts are made secure (group 0).
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void gic_init(void);
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//! @brief Init the current CPU's GIC interface.
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//!
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//! @post Enables the CPU interface and sets the priority mask to 255. Interrupt preemption
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//! is disabled by setting the Binary Point to a value of 7.
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void gic_init_cpu(void);
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//@}
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//! @name GIC Interrupt Distributor Functions
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//@{
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//! @brief Enable or disable the GIC Distributor.
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//!
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//! Enables or disables the GIC distributor passing both secure (group 0) and non-secure
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//! (group 1) interrupts to the CPU interfaces.
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//!
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//! @param enableIt Pass true to enable or false to disable.
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void gic_enable(bool enableIt);
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//! @brief Set the security mode for an interrupt.
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//!
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//! @param irqID The interrupt number.
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//! @param isSecure Whether the interrupt is taken to secure mode.
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void gic_set_irq_security(uint32_t irqID, bool isSecure);
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//! @brief Enable or disable an interrupt.
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//!
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//! @param irqID The number of the interrupt to control.
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//! @param isEnabled Pass true to enable or false to disable.
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void gic_enable_irq(uint32_t irqID, bool isEnabled);
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//! @brief Set whether a CPU will receive a particular interrupt.
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//!
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//! @param irqID The interrupt number.
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//! @param cpuNumber The CPU number. The first CPU core is 0.
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//! @param enableIt Whether to send the interrupt to the specified CPU. Pass true to enable
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//! or false to disable.
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void gic_set_cpu_target(uint32_t irqID, unsigned cpuNumber, bool enableIt);
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//! @brief Set an interrupt's priority.
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//!
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//! @param irq_id The interrupt number.
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//! @param priority The priority for the interrupt. In the range of 0 through 0xff, with
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//! 0 being the highest priority.
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void gic_set_irq_priority(uint32_t irq_id, uint32_t priority);
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//! @brief Send a software generated interrupt to a specific CPU.
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//!
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//! @param irq_id The interrupt number to send.
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//! @param target_list Each bit indicates a CPU to which the interrupt will be forwarded.
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//! Bit 0 is CPU 0, bit 1 is CPU 1, and so on. If the value is 0, then the interrupt
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//! will not be forwarded to any CPUs. This parameter is only used if @a filter_list
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//! is set to #kGicSgiFilter_UseTargetList.
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//! @param filter_list One of the enums of the #_gicd_sgi_filter enumeration. The selected
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//! option determines which CPUs the interrupt will be sent to. If the value
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//! is #kGicSgiFilter_UseTargetList, then the @a target_list parameter is used.
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void gic_send_sgi(uint32_t irq_id, uint32_t target_list, uint32_t filter_list);
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//@}
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//! @name GIC CPU Interface Functions
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//@{
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//! @brief Enable or disable the interface to the GIC for the current CPU.
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//!
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//! @param enableIt Pass true to enable or false to disable.
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void gic_cpu_enable(bool enableIt);
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//! @brief Set the mask of which interrupt priorities the CPU will receive.
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//!
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//! @param priority The lowest priority that will be passed to the current CPU. Pass 0xff to
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//! allow all priority interrupts to signal the CPU.
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void gic_set_cpu_priority_mask(uint32_t priority);
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//! @brief Acknowledge starting of interrupt handling and get the interrupt number.
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//!
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//! Normally, this function is called at the beginning of the IRQ handler. It tells the GIC
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//! that you are starting to handle an interupt, and returns the number of the interrupt you
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//! need to handle. After the interrupt is handled, you should call gic_write_end_of_irq()
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//! to signal that the interrupt is completely handled.
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//!
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//! In some cases, a spurious interrupt might happen. One possibility is if another CPU handles
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//! the interrupt. When a spurious interrupt occurs, the end of the interrupt should be indicated
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//! but nothing else.
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//!
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//! @return The number for the highest priority interrupt available for the calling CPU. If
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//! the return value is 1022 or 1023, a spurious interrupt has occurred.
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uint32_t gic_read_irq_ack(void);
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//! @brief Signal the end of handling an interrupt.
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//!
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//! @param irq_id The number of the interrupt for which handling has finished.
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void gic_write_end_of_irq(uint32_t irq_id);
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//@}
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#if defined(__cplusplus)
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}
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#endif
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//! @}
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#endif // __GIC_H__
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////////////////////////////////////////////////////////////////////////////////
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// EOF
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////////////////////////////////////////////////////////////////////////////////
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