208 lines
5.3 KiB
C++
208 lines
5.3 KiB
C++
/*
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* \brief Frame-buffer driver for the OMAP4430 display-subsystem (HDMI)
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* \author Norman Feske
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* \date 2012-06-21
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*/
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/*
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* Copyright (C) 2012-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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/* Genode includes */
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#include <base/attached_rom_dataspace.h>
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#include <base/component.h>
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#include <base/log.h>
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#include <framebuffer_session/framebuffer_session.h>
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#include <dataspace/client.h>
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#include <blit/blit.h>
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#include <os/static_root.h>
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#include <timer_session/connection.h>
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/* local includes */
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#include <driver.h>
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namespace Framebuffer {
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using namespace Genode;
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class Session_component;
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};
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class Framebuffer::Session_component : public Genode::Rpc_object<Framebuffer::Session>
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{
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private:
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/*
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* Noncopyable
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*/
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Session_component(Session_component const &);
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Session_component &operator = (Session_component const &);
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size_t _width;
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size_t _height;
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bool _buffered;
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Mode _mode { };
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Driver::Format _format;
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size_t _size;
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/* dataspace uses a back buffer (if '_buffered' is true) */
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Genode::Dataspace_capability _bb_ds;
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void *_bb_addr;
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/* dataspace of physical frame buffer */
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Genode::Dataspace_capability _fb_ds;
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void *_fb_addr;
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Signal_context_capability _sync_sigh { };
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Timer::Connection _timer;
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/**
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* Convert Driver::Format to Framebuffer::Mode::Format
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*/
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static Mode::Format _convert_format(Driver::Format driver_format)
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{
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switch (driver_format) {
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case Driver::FORMAT_RGB565: return Mode::RGB565;
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}
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return Mode::INVALID;
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}
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void _refresh_buffered(int x, int y, int w, int h)
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{
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Mode _mode = mode();
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/* clip specified coordinates against screen boundaries */
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int x2 = min(x + w - 1, (int)_mode.width() - 1),
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y2 = min(y + h - 1, (int)_mode.height() - 1);
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int x1 = max(x, 0),
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y1 = max(y, 0);
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if (x1 > x2 || y1 > y2) return;
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int bypp = _mode.bytes_per_pixel();
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/* copy pixels from back buffer to physical frame buffer */
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char *src = (char *)_bb_addr + bypp*(_mode.width()*y1 + x1),
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*dst = (char *)_fb_addr + bypp*(_mode.width()*y1 + x1);
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blit(src, bypp*_mode.width(), dst, bypp*_mode.width(),
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bypp*(x2 - x1 + 1), y2 - y1 + 1);
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}
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public:
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Session_component(Genode::Env &env, Driver &driver, size_t width, size_t height,
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Driver::Output output, bool buffered)
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: _width(width),
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_height(height),
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_buffered(buffered),
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_format(Driver::FORMAT_RGB565),
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_size(driver.buffer_size(width, height, _format)),
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_bb_ds(buffered ? env.ram().alloc(_size)
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: Genode::Ram_dataspace_capability()),
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_bb_addr(buffered ? (void*)env.rm().attach(_bb_ds) : 0),
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_fb_ds(env.ram().alloc(_size, WRITE_COMBINED)),
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_fb_addr((void*)env.rm().attach(_fb_ds)),
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_timer(env)
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{
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if (!driver.init(width, height, _format, output,
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Dataspace_client(_fb_ds).phys_addr())) {
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error("Could not initialize display");
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struct Could_not_initialize_display : Exception { };
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throw Could_not_initialize_display();
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}
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Genode::log("using ", width, "x", height,
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output == Driver::OUTPUT_HDMI ? " HDMI" : " LCD");
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}
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/************************************
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** Framebuffer::Session interface **
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************************************/
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Dataspace_capability dataspace() override
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{
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return _buffered ? _bb_ds : _fb_ds;
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}
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Mode mode() const override
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{
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return Mode(_width,
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_height,
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_convert_format(_format));
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}
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void mode_sigh(Genode::Signal_context_capability) override { }
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void sync_sigh(Genode::Signal_context_capability sigh) override
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{
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_sync_sigh = sigh;
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_timer.sigh(_sync_sigh);
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_timer.trigger_periodic(10*1000);
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}
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void refresh(int x, int y, int w, int h) override
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{
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if (_buffered)
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_refresh_buffered(x, y, w, h);
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if (_sync_sigh.valid())
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Signal_transmitter(_sync_sigh).submit();
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}
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};
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template <typename T>
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static T config_attribute(Genode::Xml_node node, char const *attr_name, T const &default_value)
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{
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return node.attribute_value(attr_name, default_value);
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}
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static Framebuffer::Driver::Output config_output(Genode::Xml_node node,
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Framebuffer::Driver::Output default_value)
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{
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Framebuffer::Driver::Output value = default_value;
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try {
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Genode::String<8> output;
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node.attribute("output").value(&output);
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if (output == "LCD") { value = Framebuffer::Driver::OUTPUT_LCD; }
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} catch (...) { }
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return value;
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}
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struct Main
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{
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Genode::Env &_env;
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Genode::Entrypoint &_ep;
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Genode::Attached_rom_dataspace _config { _env, "config" };
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Framebuffer::Driver _driver { _env };
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Framebuffer::Session_component _fb_session { _env, _driver,
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config_attribute(_config.xml(), "width", 1024u),
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config_attribute(_config.xml(), "height", 768u),
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config_output(_config.xml(), Framebuffer::Driver::OUTPUT_HDMI),
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config_attribute(_config.xml(), "buffered", false),
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};
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Genode::Static_root<Framebuffer::Session> _fb_root { _ep.manage(_fb_session) };
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Main(Genode::Env &env) : _env(env), _ep(_env.ep())
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{
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/* announce service */
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_env.parent().announce(_ep.manage(_fb_root));
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}
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};
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void Component::construct(Genode::Env &env) { static Main main(env); }
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