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Add Linux SPI device SWD adapter support

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To alleviate the need to bitbang SWD, I've written a SWD SPI
implementation. This code is inspired by the work of luppy@appkaki.com
as shown at github.com/lupyuen/openocd-spi but with the desire to be
more generic. This implementation makes use of the more common 4 wire
SPI port using full duplex transfers to be able to capture the SWD ACK
bits when a SWD TX operation is in progress.

TEST:
  Connects successfully with the following combinations:
  Hosts:
    Raspberry Pi 4B
    Unnamed Qualcomm SoC with QUPv3 based SPI port
  Targets:
    Raspberry Pi 2040
    Nordic nRF52840
    NXP RT500

Change-Id: Ic2f38a1806085d527e6f999a3d15aea6f32d1019
Signed-off-by: Richard Pasek <rpasek@google.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/8645
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-by: zapb <dev@zapb.de>
Tested-by: jenkins
This commit is contained in:
Richard Pasek
2024-12-11 00:43:57 -05:00
committed by Tomas Vanek
parent 26f2df80c3
commit 83e0293f7b
7 changed files with 711 additions and 0 deletions
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src/jtag/interface.h
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@@ -386,6 +386,7 @@ extern struct adapter_driver jtag_dpi_adapter_driver;
extern struct adapter_driver jtag_vpi_adapter_driver;
extern struct adapter_driver kitprog_adapter_driver;
extern struct adapter_driver linuxgpiod_adapter_driver;
extern struct adapter_driver linuxspidev_adapter_driver;
extern struct adapter_driver opendous_adapter_driver;
extern struct adapter_driver openjtag_adapter_driver;
extern struct adapter_driver osbdm_adapter_driver;