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Add a mock regmap implementation to act as a simulated DSP for KUnit testing. This is built as a utility module so that it could be used by clients of cs_dsp to create a mock "DSP" for their own testing. cs_dsp interacts with the DSP only through registers. Most of the register space of the DSP is RAM. ADSP cores have a small set of control registers. HALO Core DSPs have a much larger set of control registers but only a small subset are used. Most writes are "blind" in the sense that cs_dsp does not expect to receive any sort of response from the DSP. So there isn't any need to emulate a "DSP", only a set of registers that can be written and read back. The idea of the mock regmap is to use the cache to accumulate writes which can then be tested against the values that are expected to be in the registers. Stray writes can be detected by dropping the cache entries for all addresses that should have been written and then issuing a regcache_sync(). If this causes bus writes it means there were writes to unexpected registers. Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com> Link: https://patch.msgid.link/20241212143725.1381013-2-rf@opensource.cirrus.com Signed-off-by: Mark Brown <broonie@kernel.org>
13 lines
419 B
C
13 lines
419 B
C
// SPDX-License-Identifier: GPL-2.0-only
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//
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// Utility module for cs_dsp KUnit testing.
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//
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// Copyright (C) 2024 Cirrus Logic, Inc. and
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// Cirrus Logic International Semiconductor Ltd.
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#include <linux/module.h>
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MODULE_DESCRIPTION("Utilities for Cirrus Logic DSP driver testing");
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MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
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MODULE_LICENSE("GPL");
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MODULE_IMPORT_NS("FW_CS_DSP");
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