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arm-trusted-firmware/include/common/fdt_fixup.h

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qemu: Move and generalise FDT PSCI fixup The QEMU platform port scans its device tree to advertise PSCI as the CPU enable method. It does this by scanning *every* node in the DT and check whether its compatible string starts with "arm,cortex-a". Then it sets the enable-method to PSCI, if it doesn't already have one. Other platforms might want to use this functionality as well, so let's move it out of the QEMU platform directory and make it more robust by fixing some shortcomings: - A compatible string starting with a certain prefix is not a good way to find the CPU nodes. For instance a "arm,cortex-a72-pmu" node will match as well and is in turn favoured with an enable-method. - If the DT already has an enable-method, we won't change this to PSCI. Those two issues will for instance fail on the Raspberry Pi 4 DT. To fix those problems, we adjust the scanning method: The DT spec says that all CPU nodes are subnodes of the mandatory /cpus node, which is a subnode of the root node. Also each CPU node has to have a device_type = "cpu" property. So we find the /cpus node, then scan for a subnode with the proper device_type, forcing the enable-method to "psci". We have to restart this search after a property has been patched, as the node offsets might have changed meanwhile. This allows this routine to be reused for the Raspberry Pi 4 later. Change-Id: I00cae16cc923d9f8bb96a9b2a2933b9a79b06139 Signed-off-by: Andre Przywara <andre.przywara@arm.com>
5 years ago
/*
Add support to export a /cpus node to the device tree. This patch creates and populates the /cpus node in a device tree based on the existing topology. It uses the minimum required nodes and properties to satisfy the binding as specified in https://www.kernel.org/doc/Documentation/devicetree/bindings/arm/cpus.txt Signed-off-by: Javier Almansa Sobrino <javier.almansasobrino@arm.com> Change-Id: I03bf4e9a6427da0a3b8ed013f93d7bc43b5c4df0
4 years ago
* Copyright (c) 2019-2020, ARM Limited and Contributors. All rights reserved.
qemu: Move and generalise FDT PSCI fixup The QEMU platform port scans its device tree to advertise PSCI as the CPU enable method. It does this by scanning *every* node in the DT and check whether its compatible string starts with "arm,cortex-a". Then it sets the enable-method to PSCI, if it doesn't already have one. Other platforms might want to use this functionality as well, so let's move it out of the QEMU platform directory and make it more robust by fixing some shortcomings: - A compatible string starting with a certain prefix is not a good way to find the CPU nodes. For instance a "arm,cortex-a72-pmu" node will match as well and is in turn favoured with an enable-method. - If the DT already has an enable-method, we won't change this to PSCI. Those two issues will for instance fail on the Raspberry Pi 4 DT. To fix those problems, we adjust the scanning method: The DT spec says that all CPU nodes are subnodes of the mandatory /cpus node, which is a subnode of the root node. Also each CPU node has to have a device_type = "cpu" property. So we find the /cpus node, then scan for a subnode with the proper device_type, forcing the enable-method to "psci". We have to restart this search after a property has been patched, as the node offsets might have changed meanwhile. This allows this routine to be reused for the Raspberry Pi 4 later. Change-Id: I00cae16cc923d9f8bb96a9b2a2933b9a79b06139 Signed-off-by: Andre Przywara <andre.przywara@arm.com>
5 years ago
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef FDT_FIXUP_H
#define FDT_FIXUP_H
int dt_add_psci_node(void *fdt);
int dt_add_psci_cpu_enable_methods(void *fdt);
Add fdt_add_reserved_memory() helper function If a firmware component like TF-A reserves special memory regions for its own or secure payload services, it should announce the location and size of those regions to the non-secure world. This will avoid disappointment when some rich OS tries to acccess this memory, which will likely end in a crash. The traditional way of advertising reserved memory using device tree is using the special memreserve feature of the device tree blob (DTB). However by definition those regions mentioned there do not prevent the rich OS to map this memory, which may lead to speculative accesses to this memory and hence spurious bus errors. A safer way of carving out memory is to use the /reserved-memory node as part of the normal DT structure. Besides being easier to setup, this also defines an explicit "no-map" property to signify the secure-only nature of certain memory regions, which avoids the rich OS to accidentally step on it. Add a helper function to allow platform ports to easily add a region. Change-Id: I2b92676cf48fd3bdacda05b5c6b1c7952ebed68c Signed-off-by: Andre Przywara <andre.przywara@arm.com>
5 years ago
int fdt_add_reserved_memory(void *dtb, const char *node_name,
uintptr_t base, size_t size);
Add support to export a /cpus node to the device tree. This patch creates and populates the /cpus node in a device tree based on the existing topology. It uses the minimum required nodes and properties to satisfy the binding as specified in https://www.kernel.org/doc/Documentation/devicetree/bindings/arm/cpus.txt Signed-off-by: Javier Almansa Sobrino <javier.almansasobrino@arm.com> Change-Id: I03bf4e9a6427da0a3b8ed013f93d7bc43b5c4df0
4 years ago
int fdt_add_cpus_node(void *dtb, unsigned int afflv0,
unsigned int afflv1, unsigned int afflv2);
fdt: Add function to adjust GICv3 redistributor size We now have code to detect the CPU topology at runtime, and can also populate the CPU nodes in a devicetree accordingly. This is used by the ARM FPGA port, for instance. But also a GICv3 compatible interrupt controller provides MMIO frames per core, so the size of this region needs to be adjusted in the DT, to match the number of cores as well. Provide a generic function to find the GICv3 interrupt controller in the DT, then adjust the "reg" entry to match the number of detected cores. Since the size of the GICR frame per cores differs between GICv4 and GICv3, this size is supplied as a parameter to the function. The caller should determine the applicable value by either hardcoding it or by observing GICR_TYPER.VLPIS. Change-Id: Ic2a6445c2c5381a36bf24263f52fcbefad378c05 Signed-off-by: Andre Przywara <andre.przywara@arm.com>
4 years ago
int fdt_adjust_gic_redist(void *dtb, unsigned int nr_cores,
unsigned int gicr_frame_size);
qemu: Move and generalise FDT PSCI fixup The QEMU platform port scans its device tree to advertise PSCI as the CPU enable method. It does this by scanning *every* node in the DT and check whether its compatible string starts with "arm,cortex-a". Then it sets the enable-method to PSCI, if it doesn't already have one. Other platforms might want to use this functionality as well, so let's move it out of the QEMU platform directory and make it more robust by fixing some shortcomings: - A compatible string starting with a certain prefix is not a good way to find the CPU nodes. For instance a "arm,cortex-a72-pmu" node will match as well and is in turn favoured with an enable-method. - If the DT already has an enable-method, we won't change this to PSCI. Those two issues will for instance fail on the Raspberry Pi 4 DT. To fix those problems, we adjust the scanning method: The DT spec says that all CPU nodes are subnodes of the mandatory /cpus node, which is a subnode of the root node. Also each CPU node has to have a device_type = "cpu" property. So we find the /cpus node, then scan for a subnode with the proper device_type, forcing the enable-method to "psci". We have to restart this search after a property has been patched, as the node offsets might have changed meanwhile. This allows this routine to be reused for the Raspberry Pi 4 later. Change-Id: I00cae16cc923d9f8bb96a9b2a2933b9a79b06139 Signed-off-by: Andre Przywara <andre.przywara@arm.com>
5 years ago
#endif /* FDT_FIXUP_H */