drivers: stm32_hpdma: implement transient CID0 on AHB errata for HPDMAs

On stm32mp2x SoCs, when an AHB busy signal is inserted during a
transaction, a ghost CID0 is generated on the bus. If the comp

drivers: stm32_hpdma: implement transient CID0 on AHB errata for HPDMAs

On stm32mp2x SoCs, when an AHB busy signal is inserted during a
transaction, a ghost CID0 is generated on the bus. If the compartment
filtering is enabled on RISAB3/4/5, this transient CID0 is interpreted
as a fault access by RISAB3/4/5 which aborts current access and returns
an IAC. Described in section 2.3.21 of errata sheet available here: [1].
Therefore, when CID filtering is enabled on RISAB, we must ban CID0 as
a possible CID value configured for any initiator on the bus.
This avoids a conflict between an initiator holding CID0 and the
transient CID0.

When "st,errata-ahbrisab" is set in the device tree, HPDMA channels cannot
hold the CID0 value on the bus.

Link: https://www.st.com/resource/en/errata_sheet/es0598-stm32mp23xx25xx-device-errata-stmicroelectronics.pdf [1]
Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Acked-by: Etienne Carriere <etienne.carriere@foss.st.com>

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drivers: stm32_hpdma: update and fix CID filtering configuration

The conditions to acquire or release RIF semaphores when applying
the CID filtering configuration were incorrect. Add
handle_availabl

drivers: stm32_hpdma: update and fix CID filtering configuration

The conditions to acquire or release RIF semaphores when applying
the CID filtering configuration were incorrect. Add
handle_available_semaphores() to handle correctly the RIF semaphores.

Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Acked-by: Etienne Carriere <etienne.carriere@foss.st.com>
Fixes: 0cf1cd13ceb6 ("drivers: add HPDMA driver with RIF support")

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drivers: stm32_hpdma: do not make RIF configuration mandatory

It should not be mandatory to apply a RIF configuration for a HPDMA.
Remove this constraint by allocating a RIF configuration structure

drivers: stm32_hpdma: do not make RIF configuration mandatory

It should not be mandatory to apply a RIF configuration for a HPDMA.
Remove this constraint by allocating a RIF configuration structure only
when the "st,protreg" property is present in the device tree to be
able to check if it has been allocated later.

Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>

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drivers: stm32_rif: update and fix RIF configuration parsing

Fix the parsing of the RIF configuration by using device tree bindings,
when necessary. Generalize RIF bit fields and use them when deali

drivers: stm32_rif: update and fix RIF configuration parsing

Fix the parsing of the RIF configuration by using device tree bindings,
when necessary. Generalize RIF bit fields and use them when dealing
with generic RIF functions. Update drivers that use stm32_rif_parse_cfg()
accordingly.

Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>
Fixes: 1506f47af917 ("drivers: firewall: add stm32_rif driver for common RIF features")

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drivers: add HPDMA driver with RIF support

This driver implements RIF configuration for HPDMA, which is a RIF aware
IP. It means that the HPDMA driver is in charge of configuring its own RIF
restric

drivers: add HPDMA driver with RIF support

This driver implements RIF configuration for HPDMA, which is a RIF aware
IP. It means that the HPDMA driver is in charge of configuring its own RIF
restrictions and that the HPDMA has dedicated RIF configuration registers.

RIF configuration is possible when the executing context is TDCID.

Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Acked-by: Etienne Carriere <etienne.carriere@foss.st.com>

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