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+/*
+ * Copyright (c) 2015 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: Andreas Sandberg
+ */
+
+#include "dev/pixelpump.hh"
+
+const DisplayTimings DisplayTimings::vga(
+ 640, 480,
+ 48, 96, 16,
+ 33, 2, 10);
+
+
+DisplayTimings::DisplayTimings(unsigned _width, unsigned _height,
+ unsigned hbp, unsigned h_sync, unsigned hfp,
+ unsigned vbp, unsigned v_sync, unsigned vfp)
+ : width(_width), height(_height),
+ hBackPorch(hbp), hFrontPorch(hfp), hSync(h_sync),
+ vBackPorch(vbp), vFrontPorch(vfp), vSync(v_sync)
+{
+}
+
+void
+DisplayTimings::serialize(CheckpointOut &cp) const
+{
+ SERIALIZE_SCALAR(width);
+ SERIALIZE_SCALAR(height);
+
+ SERIALIZE_SCALAR(hBackPorch);
+ SERIALIZE_SCALAR(hFrontPorch);
+ SERIALIZE_SCALAR(hSync);
+
+ SERIALIZE_SCALAR(vBackPorch);
+ SERIALIZE_SCALAR(vFrontPorch);
+ SERIALIZE_SCALAR(vSync);
+}
+
+void
+DisplayTimings::unserialize(CheckpointIn &cp)
+{
+ UNSERIALIZE_SCALAR(width);
+ UNSERIALIZE_SCALAR(height);
+
+ UNSERIALIZE_SCALAR(hBackPorch);
+ UNSERIALIZE_SCALAR(hFrontPorch);
+ UNSERIALIZE_SCALAR(hSync);
+
+ UNSERIALIZE_SCALAR(vBackPorch);
+ UNSERIALIZE_SCALAR(vFrontPorch);
+ UNSERIALIZE_SCALAR(vSync);
+}
+
+
+BasePixelPump::BasePixelPump(EventManager &em, ClockDomain &pxl_clk,
+ unsigned pixel_chunk)
+ : EventManager(em), Clocked(pxl_clk), Serializable(),
+ pixelChunk(pixel_chunk),
+ pixelEvents(),
+ evVSyncBegin("evVSyncBegin", this, &BasePixelPump::onVSyncBegin),
+ evVSyncEnd("evVSyncEnd", this, &BasePixelPump::onVSyncEnd),
+ evHSyncBegin("evHSyncBegin", this, &BasePixelPump::onHSyncBegin),
+ evHSyncEnd("evHSyncEnd", this, &BasePixelPump::onHSyncEnd),
+ evBeginLine("evBeginLine", this, &BasePixelPump::beginLine),
+ evRenderPixels("evRenderPixels", this, &BasePixelPump::renderPixels),
+ _timings(DisplayTimings::vga),
+ line(0), _posX(0), _underrun(false)
+{
+}
+
+BasePixelPump::~BasePixelPump()
+{
+}
+
+void
+BasePixelPump::serialize(CheckpointOut &cp) const
+{
+ SERIALIZE_SCALAR(line);
+ SERIALIZE_SCALAR(_posX);
+ SERIALIZE_SCALAR(_underrun);
+
+ SERIALIZE_OBJ(_timings);
+ SERIALIZE_OBJ(fb);
+
+ for (PixelEvent *event : pixelEvents)
+ event->serializeSection(cp, event->name());
+}
+
+void
+BasePixelPump::unserialize(CheckpointIn &cp)
+{
+ UNSERIALIZE_SCALAR(line);
+ UNSERIALIZE_SCALAR(_posX);
+ UNSERIALIZE_SCALAR(_underrun);
+
+ UNSERIALIZE_OBJ(_timings);
+ UNSERIALIZE_OBJ(fb);
+
+ // We don't need to reschedule the event here since the event was
+ // suspended by PixelEvent::drain() and will be rescheduled by
+ // PixelEvent::drainResume().
+ for (PixelEvent *event : pixelEvents)
+ event->unserializeSection(cp, event->name());
+}
+
+
+void
+BasePixelPump::start(const DisplayTimings &timings)
+{
+ _timings = timings;
+
+ // Resize the frame buffer if needed
+ if (_timings.width != fb.width() || _timings.height != fb.height())
+ fb.resize(timings.width, timings.height);
+
+ // Set the current line past the last line in the frame. This
+ // triggers the new frame logic in beginLine().
+ line = _timings.linesPerFrame();
+ schedule(evBeginLine, clockEdge());
+}
+
+void
+BasePixelPump::stop()
+{
+ if (evVSyncEnd.scheduled())
+ deschedule(evVSyncEnd);
+
+ if (evHSyncBegin.scheduled())
+ deschedule(evHSyncBegin);
+
+ if (evHSyncEnd.scheduled())
+ deschedule(evHSyncEnd);
+
+ if (evBeginLine.scheduled())
+ deschedule(evBeginLine);
+
+ if (evRenderPixels.scheduled())
+ deschedule(evRenderPixels);
+}
+
+void
+BasePixelPump::beginLine()
+{
+ _posX = 0;
+ line++;
+ if (line >= _timings.linesPerFrame()) {
+ _underrun = false;
+ line = 0;
+ }
+
+ if (line == _timings.lineVSyncStart()) {
+ onVSyncBegin();
+ } else if (line == _timings.lineVBackPorchStart()) {
+ onVSyncEnd();
+ }
+
+ const Cycles h_sync_begin(0);
+ schedule(evHSyncBegin, clockEdge(h_sync_begin));
+
+ const Cycles h_sync_end(h_sync_begin + _timings.hSync);
+ schedule(evHSyncEnd, clockEdge(h_sync_end));
+
+ // Visible area
+ if (line >= _timings.lineFirstVisible() &&
+ line < _timings.lineFrontPorchStart()) {
+
+ const Cycles h_first_visible(h_sync_end + _timings.hBackPorch);
+ schedule(evRenderPixels, clockEdge(h_first_visible));
+ }
+
+ schedule(evBeginLine, clockEdge(_timings.cyclesPerLine()));
+}
+
+void
+BasePixelPump::renderPixels()
+{
+ // Try to handle multiple pixels at a time; doing so reduces the
+ // accuracy of the underrun detection but lowers simulation
+ // overhead
+ const unsigned x_end(std::min(_posX + pixelChunk, _timings.width));
+ const unsigned pxl_count(x_end - _posX);
+ const unsigned pos_y(posY());
+
+ Pixel pixel(0, 0, 0);
+ const Pixel underrun_pixel(0, 0, 0);
+ for (; _posX < x_end && !_underrun; ++_posX) {
+ if (!nextPixel(pixel)) {
+ warn("Input buffer underrun in BasePixelPump (%u, %u)\n",
+ _posX, pos_y);
+ _underrun = true;
+ onUnderrun(_posX, pos_y);
+ pixel = underrun_pixel;
+ }
+ fb.pixel(_posX, pos_y) = pixel;
+ }
+
+ // Fill remaining pixels with a dummy pixel value if we ran out of
+ // data
+ for (; _posX < x_end; ++_posX)
+ fb.pixel(_posX, pos_y) = underrun_pixel;
+
+ // Schedule a new event to handle the next block of pixels
+ if (_posX < _timings.width) {
+ schedule(evRenderPixels, clockEdge(Cycles(pxl_count)));
+ } else {
+ if (pos_y == _timings.height - 1)
+ onFrameDone();
+ }
+}
+
+BasePixelPump::PixelEvent::PixelEvent(
+ const char *name, BasePixelPump *_parent, CallbackType _func)
+ : Event(), Drainable(),
+ _name(name), parent(*_parent), func(_func),
+ suspended(false),
+ relativeTick(0)
+{
+ parent.pixelEvents.push_back(this);
+}
+
+DrainState
+BasePixelPump::PixelEvent::drain()
+{
+ if (scheduled())
+ suspend();
+ return DrainState::Drained;
+}
+
+void
+BasePixelPump::PixelEvent::drainResume()
+{
+ if (suspended)
+ resume();
+}
+
+void
+BasePixelPump::PixelEvent::serialize(CheckpointOut &cp) const
+{
+ assert(!scheduled());
+ Event::serialize(cp);
+ SERIALIZE_SCALAR(suspended);
+ SERIALIZE_SCALAR(relativeTick);
+}
+
+void
+BasePixelPump::PixelEvent::unserialize(CheckpointIn &cp)
+{
+ Event::unserialize(cp);
+ UNSERIALIZE_SCALAR(suspended);
+ UNSERIALIZE_SCALAR(relativeTick);
+ assert(!scheduled());
+}
+
+void
+BasePixelPump::PixelEvent::suspend()
+{
+ assert(scheduled());
+ assert(!suspended);
+
+ suspended = true;
+ relativeTick = when() - curTick();
+ parent.deschedule(this);
+}
+
+void
+BasePixelPump::PixelEvent::resume()
+{
+ assert(!scheduled());
+ assert(suspended);
+ parent.schedule(this, relativeTick + curTick());
+ suspended = false;
+ relativeTick = 0;
+}
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