opensbi.git/platform/fpga/openpiton, branch master

platform: openpiton: Move openpiton platform from fpga to generic

2025-08-26T11:38:00Z

The OpenPiton framework has a generic PMU that is not used by OpenSBI. Due to OpenSBI’s build system we cannot directly reuse the generic platform functions, so move the OpenPiton platform to generic. Also due to the generic platform is where new features are added. Signed-off-by: Manuel Hernández Méndez Reviewed-by: Anup Patel Link: https://lore.kernel.org/r/20250813104759.33276-1-maherme.dev@gmail.com Signed-off-by: Anup Patel

platform: openpiton: fix uninitialized plic_data struct

2025-07-22T09:56:44Z

The plic_data struct was uninitialized. This led to misfunction behavior since it was subsequently assigned to the global plic struct, and some struct fields, such as flags and irqchip, contained random values. The fix proposes to initialize the plic_data to the global plic struct, so, after parsing the fdt, the fields of the struct will be set to the default values set in global plic struct definition, or the parsed values in the fdt, or zero. Fixes: 4c37451 ("platform: openpiton: Read the device configurations from device tree") Signed-off-by: Manuel Hernández Méndez Reviewed-by: Xiang W Reviewed-by: Anup Patel Link: https://lore.kernel.org/r/20250708180914.1131-1-maherme.dev@gmail.com Signed-off-by: Anup Patel

lib: utils/serial: Add PXA UARTs support

2025-03-27T14:50:05Z

The PXA variant of the uart8250 adds the UART Unit Enable bit (UUE) that needs to be set to enable the XScale PXA UART. And it is required for some RISC-V SoCs like the Spacemit K1 that implement the PXA UART. This introduces the "intel,xscale-uart" compatible to handle setting the UUE bit. Signed-off-by: Junhui Liu Reviewed-by: Anup Patel Link: https://lore.kernel.org/r/20250327-pxa-uart-support-v2-1-c4400c1fcd0b@pigmoral.tech Signed-off-by: Anup Patel

platform: Drop irqchip warm init and exit hooks

2024-11-28T06:16:36Z

Now that driver lifecycle is managed from within the SBI irqchip core, platforms need only to initialize the driver once during cold init. Remove the remaining platform hooks that are no longer used. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

lib: sbi_irqchip: Call driver warm_init from SBI core

2024-11-28T06:10:17Z

Currently, each platform keeps track of which irqchip driver is in use and calls its warm init function. Since the generic platform may use multiple irqchip drivers, it has logic to track an array of drivers. The code is simplified and made common across platforms by treating warm init and exit as properties of the driver, not the platform. Then the platform's only role is to select and prepare a driver during cold boot. For now, only add a .warm_init hook, since none of the existing drivers need an .exit hook. It could be added in the future if needed. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

lib: utils/irqchip: Move per-hart data from fdt_plic to plic

2024-11-28T06:05:01Z

The per-hart PLIC pointer is not really specific to FDT platforms. Move it into the main driver and drop the extra wrapper functions. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

lib: utils/irqchip: plic: Provide a hartindex to context map

2024-11-28T04:06:46Z

This removes platform-specific arguments to plic_warm_irqchip_init(), which makes the driver independent from the platform after cold init, and allows for further refactoring. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

lib: utils/irqchip: plic: Allow enabling IRQs by default

2024-11-28T04:05:10Z

Unlike other platforms, Ariane and OpenPiton enable all IRQs by default. This was described in commit b44e844880d0 ("Add support for Ariane FPGA SoC") as "due to some issue of the design." Add this workaround behind a flag in plic_warm_irqchip_init(), so every platform can use the same warm init function. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

platform: Drop IPI warm init and exit hooks

2024-11-11T12:51:04Z

Now that the SBI IPI core clears IPIs at warm boot in a generic way, none of the drivers or platforms use these hooks, and we can remove them. Platforms need only to initialize the driver once during cold init. If other hooks are needed in the future, they can be added to struct sbi_ipi_device. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

lib: sbi_ipi: Move initial IPI clear to sbi_ipi_init()

2024-11-11T12:48:35Z

sbi_ipi_init() expects the platform warm init function to clear IPIs on the local hart, but there is already a generic function to do this. After this change, none of the existing drivers need a warm init callback. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel