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539d147ef6
Add a new compatible for the plic found in UltraRISC DP1000 with a quirk to work around a known hardware bug with IRQ claiming in the UR-CP100 cores. When claiming an interrupt on UR-CP100 cores, all other interrupts must be disabled before the claim register is accessed to prevent incorrect handling of the interrupt. This is a hardware bug in the CP100 core implementation, not specific to the DP1000 SoC. When the PLIC_QUIRK_CP100_CLAIM_REGISTER_ERRATUM flag is present, a specialized handler (plic_handle_irq_cp100) disables all interrupts except for the first pending one before reading the claim register, and then restores the interrupts before further processing of the claimed interrupt continues. This implementation leverages the enable_save optimization, which maintains the current interrupt enable state in memory, avoiding additional register reads during the workaround. The driver matches on "ultrarisc,cp100-plic" to apply the quirk to all SoCs using UR-CP100 cores, regardless of the specific SoC implementation. This has no impact on other platforms. [ tglx: Condensed the code a bit, massaged change log and comments ] Co-developed-by: Zhang Xincheng <zhangxincheng@ultrarisc.com> Signed-off-by: Zhang Xincheng <zhangxincheng@ultrarisc.com> Signed-off-by: Charles Mirabile <cmirabil@redhat.com> Signed-off-by: Lucas Zampieri <lzampier@redhat.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Samuel Holland <samuel.holland@sifive.com> Link: https://patch.msgid.link/20251024083647.475239-5-lzampier@redhat.com |
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.