06ad980305
GEM-related clock models were incorrect and are fixed as follows (documented below for GEM0, but the same holds for any GEM ID): - CLK_GEM0_REF_UNGATED represents clock that has DIV0/1 divisors and the multiplexer controllable in GEM0_REF_CTRL (CRL_APB). The ID of this clock is newly introduced in this patch. - CLK_GEM0_REF models the clock mux that selects the reference clock for Tx, i.e. selects CLK_GEM0_REF_UNGATED or external Tx clock. This mux is controllable via GEM_CLK_CTRL (IOU_SLCR), bit GEM0_REF_SRC_SEL. Note that the routing of external clock to the mux is not modelled and is assumed to be configured by the FSBL if required, and not changeable at runtime. The ID of this clock is introduced in this patch. - CLK_GEM0_TX models clock with only a gate that is controlled via bit 25 in GEM0_REF_CTRL (CRL_APB). The parent of this clock is CLK_GEM0_REF. The clock ID of CLK_GEM0_TX matches the previous ID value of CLK_GEM0_REF. This is done in order to fix the clock models and incorrect binding without requiring to change device-tree (binding of clock IDs to GEM interface). - CLK_GEM0_RX models clock that has only gate controlled via RX_CLKACT bit (26) in GEM0_REF_CTRL (CRL_APB). Parent of this clock is sourced from external RGMII PHY (via MIO or EMIO). We do not model the whole clock path to the Rx gate, since this is configured by the FSBL and never changed at runtime (and there is no mechanism to change the path at runtime). The clock ID of CLK_GEM0_RX clock is equal to the previous ID value of CLK_GEM0_TX clock. This is done because the TX/RX were swapped in device tree, so by fixing the IDs this way there is no need for device tree fix. Rates of the external RX/TX clocks can be specified in device tree if needed. Right now, that's not necessary because Tx clock is sourced from an on-chip PLL (via CLK_GEM0_REF_UNGATED/CLK_GEM0_REF), whereas the Rx clock is sourced from external reference and the driver never attempts to get/get clock rate (only to enable it). If this changes in future, ATF clock model doesn't need to be changed. Instead, the clock rates for gem0_tx_ext and gem0_rx_ext have to be specified in device tree. Signed-off-by: Mirela Simonovic <mirela.simonovic@aggios.com> Acked-by: Will Wong <will.wong@xilinx.com> Signed-off-by: Jolly Shah <jolly.shah@xilinx.com> Change-Id: I6497d4309e92205c527bd81b3aa932f4474f5b79 |
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readme.rst
Trusted Firmware-A
Trusted Firmware-A (TF-A) is a reference implementation of secure world software for Arm A-Profile architectures (Armv8-A and Armv7-A), including an Exception Level 3 (EL3) Secure Monitor. It provides a suitable starting point for productization of secure world boot and runtime firmware, in either the AArch32 or AArch64 execution states.
TF-A implements Arm interface standards, including:
- Power State Coordination Interface (PSCI)
- Trusted Board Boot Requirements CLIENT (TBBR-CLIENT)
- SMC Calling Convention
- System Control and Management Interface (SCMI)
- Software Delegated Exception Interface (SDEI)
The code is designed to be portable and reusable across hardware platforms and software models that are based on the Armv8-A and Armv7-A architectures.
In collaboration with interested parties, we will continue to enhance TF-A with reference implementations of Arm standards to benefit developers working with Armv7-A and Armv8-A TrustZone technology.
Users are encouraged to do their own security validation, including penetration testing, on any secure world code derived from TF-A.
More Info and Documentation
To find out more about Trusted Firmware-A, please view the full documentation that is available through trustedfirmware.org.
Copyright (c) 2013-2019, Arm Limited and Contributors. All rights reserved.