f7055e9215
Rewrite the HDLCD controller to use the new DMA engine and pixel
pump. This fixes several bugs in the current implementation:
* Broken/missing interrupt support (VSync, underrun, DMA end)
* Fragile resolution changes (changing resolutions used
to cause assertion errors).
* Support for resolutions with a width that isn't divisible by 32.
* The pixel clock can now be set dynamically.
This breaks checkpoint compatibility. Checkpoints can be upgraded with
the checkpoint conversion script. However, upgraded checkpoints won't
contain the state of the current frame. That means that HDLCD
controllers restoring from a converted checkpoint immediately start
drawing a new frame (i.e, expect timing differences).
110 lines
4.6 KiB
Python
110 lines
4.6 KiB
Python
# Copyright (c) 2015 ARM Limited
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# All rights reserved
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#
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# The license below extends only to copyright in the software and shall
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# not be construed as granting a license to any other intellectual
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# property including but not limited to intellectual property relating
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# to a hardware implementation of the functionality of the software
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# licensed hereunder. You may use the software subject to the license
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# terms below provided that you ensure that this notice is replicated
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# unmodified and in its entirety in all distributions of the software,
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# modified or unmodified, in source code or in binary form.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met: redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer;
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# redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution;
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# neither the name of the copyright holders nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# 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
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# Authors: Andreas Sandberg
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#
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def upgrader(cpt):
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"""HDLCD controller rewrite. Converted checkpoints cause the HDLCD
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model to start a new screen refresh and FIFO buffer fill immediately
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after they are loaded. Expect some timing differences."""
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import re
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if cpt.get('root','isa') != 'arm':
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return
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option_names = {
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"int_rawstat" : "int_rawstat_serial",
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"int_mask" : "int_mask_serial",
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"fb_base" : "fb_base",
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"fb_line_length" : "fb_line_length",
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"fb_line_count" : "fb_line_count_serial",
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"fb_line_pitch" : "fb_line_pitch",
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"bus_options" : "bus_options_serial",
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"v_sync" : "v_sync_serial",
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"v_back_porch" : "v_back_porch_serial",
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"v_data" : "v_data_serial",
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"v_front_porch" : "v_front_porch_serial",
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"h_sync" : "h_sync_serial",
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"h_back_porch" : "h_back_porch_serial",
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"h_data" : "h_data_serial",
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"h_front_porch" : "h_front_porch_serial",
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"polarities" : "polarities_serial",
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"command" : "command_serial",
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"pixel_format" : "pixel_format_serial",
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"red_select" : "red_select_serial",
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"green_select" : "green_select_serial",
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"blue_select" : "blue_select_serial",
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}
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for sec in cpt.sections():
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if re.search('.*\.hdlcd$', sec):
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options = {}
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for new, old in option_names.items():
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options[new] = cpt.get(sec, old)
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cpt.remove_section(sec)
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cpt.add_section(sec)
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for key, value in options.items():
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cpt.set(sec, key, value)
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# Create a DMA engine section. The LCD controller will
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# initialize the DMA it after the next VSync, so we don't
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# care about the actual values
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sec_dma = "%s.dmaEngine" % sec
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cpt.add_section(sec_dma)
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cpt.set(sec_dma, "nextLineAddr", "0")
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cpt.set(sec_dma, "frameEnd", "0")
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cpt.set(sec_dma, "startAddr", "0")
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cpt.set(sec_dma, "endAddr", "0")
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cpt.set(sec_dma, "nextAddr", "0")
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cpt.set(sec_dma, "buffer", "")
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print "Warning: Assuming that the HDLCD pixel clock and global frequency " \
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"are still using their default values."
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sec_osc = "system.realview.realview_io.osc_pxl"
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global_tick = 1E12
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pxl_freq = 137E6
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pxl_ticks = global_tick / pxl_freq
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if not cpt.has_section(sec_osc):
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cpt.add_section(sec_osc)
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cpt.set(sec_osc, "type", "RealViewOsc")
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cpt.set(sec_osc, "_clockPeriod", "%i" % pxl_ticks)
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