1ccc3d7e5b
This patch adds a new PIO-accessible GICv2m shim. This shim has a PIO slave port on one side, and SPI 'wires' on the other. It accepts MSIs from the system and triggers SPIs on the GIC. It is configurable with a number of frames, each of which has a number of SPIs and a base SPI offset. A Linux driver for GICv2m is available upstream.
121 lines
4 KiB
C++
121 lines
4 KiB
C++
/*
|
|
* Copyright (c) 2013 ARM Limited
|
|
* All rights reserved
|
|
*
|
|
* The license below extends only to copyright in the software and shall
|
|
* not be construed as granting a license to any other intellectual
|
|
* property including but not limited to intellectual property relating
|
|
* to a hardware implementation of the functionality of the software
|
|
* licensed hereunder. You may use the software subject to the license
|
|
* terms below provided that you ensure that this notice is replicated
|
|
* unmodified and in its entirety in all distributions of the software,
|
|
* modified or unmodified, in source code or in binary form.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are
|
|
* met: redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer;
|
|
* redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution;
|
|
* neither the name of the copyright holders nor the names of its
|
|
* contributors may be used to endorse or promote products derived from
|
|
* this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* Authors: Matt Evans
|
|
*/
|
|
|
|
/** @file
|
|
* Implementiation of a GICv2m MSI shim.
|
|
*
|
|
* See gic_v2m.cc for an instantiation example.
|
|
*/
|
|
|
|
#ifndef __DEV_ARM_GIC_V2M_H__
|
|
#define __DEV_ARM_GIC_V2M_H__
|
|
|
|
#include "base/bitunion.hh"
|
|
#include "cpu/intr_control.hh"
|
|
#include "dev/arm/base_gic.hh"
|
|
#include "dev/io_device.hh"
|
|
#include "dev/platform.hh"
|
|
#include "params/Gicv2m.hh"
|
|
#include "params/Gicv2mFrame.hh"
|
|
|
|
/**
|
|
* Ultimately this class should be embedded in the Gicv2m class, but
|
|
* this confuses Python as 'Gicv2m::Frame' gets interpreted as 'Frame'
|
|
* in namespace Gicv2m.
|
|
*/
|
|
class Gicv2mFrame : public SimObject
|
|
{
|
|
public:
|
|
const Addr addr;
|
|
const unsigned int spi_base;
|
|
const unsigned int spi_len;
|
|
|
|
typedef Gicv2mFrameParams Params;
|
|
Gicv2mFrame(const Params *p) :
|
|
SimObject(p), addr(p->addr), spi_base(p->spi_base), spi_len(p->spi_len)
|
|
{}
|
|
};
|
|
|
|
class Gicv2m : public PioDevice
|
|
{
|
|
private:
|
|
static const int FRAME_SIZE = 0x10000;
|
|
|
|
static const int MSI_TYPER = 0x0008;
|
|
static const int MSI_SETSPI_NSR = 0x0040;
|
|
static const int PER_ID4 = 0x0fd0;
|
|
|
|
/** Latency for an MMIO operation */
|
|
const Tick pioDelay;
|
|
|
|
/** A set of configured hardware frames */
|
|
std::vector<Gicv2mFrame *> frames;
|
|
|
|
/** Gic to which we fire interrupts */
|
|
BaseGic *gic;
|
|
|
|
/** Count of number of configured frames, as log2(frames) */
|
|
unsigned int log2framenum;
|
|
|
|
public:
|
|
typedef Gicv2mParams Params;
|
|
Gicv2m(const Params *p);
|
|
|
|
/** @{ */
|
|
/** Return the address ranges used by the Gicv2m
|
|
* This is the set of frame addresses
|
|
*/
|
|
virtual AddrRangeList getAddrRanges() const;
|
|
|
|
/** A PIO read to the device
|
|
*/
|
|
virtual Tick read(PacketPtr pkt);
|
|
|
|
/** A PIO read to the device
|
|
*/
|
|
virtual Tick write(PacketPtr pkt);
|
|
/** @} */
|
|
|
|
private:
|
|
/** Determine which frame a PIO access lands in
|
|
*/
|
|
int frameFromAddr(Addr a) const;
|
|
};
|
|
|
|
#endif //__DEV_ARM_GIC_V2M_H__
|