/*
 * \brief  Implementation of IRQ session component
 * \author Norman Feske
 * \date   2009-10-02
 */

/*
 * Copyright (C) 2009-2013 Genode Labs GmbH
 *
 * This file is part of the Genode OS framework, which is distributed
 * under the terms of the GNU General Public License version 2.
 */

/* Genode includes */
#include <base/printf.h>

/* core includes */
#include <irq_root.h>

/* Codezero includes */
#include <codezero/syscalls.h>


using namespace Genode;


bool Irq_object::_associate() { return true; }


void Irq_object::_wait_for_irq()
{
	using namespace Codezero;

	/* block for IRQ */
	int ret = l4_irq_control(IRQ_CONTROL_WAIT, 0, _irq);
	if (ret < 0)
		PWRN("l4_irq_control(IRQ_CONTROL_WAIT) returned %d", ret);
}


void Irq_object::start()
{
	::Thread_base::start();
	_sync_bootup.lock();
}


void Irq_object::entry()
{
	if (!_associate()) {
		PERR("Could not associate with IRQ 0x%x", _irq);
		return;
	}

	/* thread is up and ready */
	_sync_bootup.unlock();

	/* wait for first ack_irq */
	_sync_ack.lock();

	using namespace Codezero;

	/* attach thread to IRQ when first called */
	int ret = l4_irq_control(IRQ_CONTROL_REGISTER, 0, _irq);
	if (ret < 0) {
		PERR("l4_irq_control(IRQ_CONTROL_REGISTER) returned %d", ret);
		return;
	}

	while (true) {

		_wait_for_irq();

		if (!_sig_cap.valid())
			continue;

		Genode::Signal_transmitter(_sig_cap).submit(1);

		_sync_ack.lock();
	}
}


Irq_object::Irq_object(unsigned irq)
:
	Thread<4096>("irq"),
	_sync_ack(Lock::LOCKED), _sync_bootup(Lock::LOCKED),
	_irq(irq)
{ }


Irq_session_component::Irq_session_component(Range_allocator *irq_alloc,
                                             const char      *args)
:
	_irq_number(Arg_string::find_arg(args, "irq_number").long_value(-1)),
	_irq_alloc(irq_alloc),
	_irq_object(_irq_number)
{
	long msi = Arg_string::find_arg(args, "device_config_phys").long_value(0);
	if (msi)
		throw Root::Unavailable();

	if (!irq_alloc || irq_alloc->alloc_addr(1, _irq_number).is_error()) {
		PERR("Unavailable IRQ 0x%x requested", _irq_number);
		throw Root::Unavailable();
	}

	_irq_object.start();
}


Irq_session_component::~Irq_session_component()
{
	PERR("Not yet implemented.");
}


void Irq_session_component::ack_irq()
{
	_irq_object.ack_irq();
}


void Irq_session_component::sigh(Genode::Signal_context_capability cap)
{
	_irq_object.sigh(cap);
}


Genode::Irq_session::Info Irq_session_component::info()
{
	/* no MSI support */
	return { .type = Genode::Irq_session::Info::Type::INVALID };
}