tree e0c54fded79d26baa16445924fabc6259b0824e0
parent ca41b58205ffa9b4d1f796afa99535a78e081720
author Nicolas Le Bayon <nicolas.le.bayon@st.com> 1646755799 +0100
committer Maxime Méré <maxime.mere@foss.st.com> 1727886456 +0200

refactor(st-ddr): create generic services

Disabling AXI port, enabling host interface and both enabling/disabling
software self-refresh services are already present inside the driver
source code.
Factorize by gathering them as services inside the generic part,
and adapt driver to call these new functions.

Add services to manage quasi-dynamic registers. DDRCTRL contains
quasi-dynamic registers, which are dynamic only under some conditions
defined by the user guide (with 4 groups).
In our driver, out of reset state, only groups 3 and 4 are updated.
Group 4 needs only sw_done/sw_done_ack sequence, already available.
Group 3 sequence include more conditions, that are gathered in
specific services. stm32mp_ddr_disable_host_interface() has been added
to do this.

Add dedicated generic service to toggle rfshctl3.refresh_update_level
and wait for completion.

Manage AXI ports and HIF when updating QD3 registers. Quasi-dynamic
group 3 (QD3) registers are updated when DDR is not completely
initialized, i.e. when AXI ports are not enabled and possibly when
host interface (HIF) is not enabled too.
In that case, a specific mechanism is necessary to restore the same
conditions as before accessing QD3 registers.
Static functions have been added to get AXI ports and HIF states and
are used to determine the needed conditions to set/unset.

Signed-off-by: Nicolas Le Bayon <nicolas.le.bayon@st.com>
Change-Id: I880f88b1cb6fc76199ad9ea33e9d63a5c469aed4