[RFC PATCH] platform: generic: renesas: Add support to configure the PMA

[Yu-Chien Peter Lin <peterlin@andestech.com>]

On Wed, Dec 21, 2022 at 09:23:21AM +0800, Bin Meng wrote:
> On Mon, Dec 12, 2022 at 5:44 PM Lad Prabhakar
> <prabhakar.mahadev-lad.rj@bp.renesas.com> wrote:
> >
> > Add support to configure the PMA regions and create a corresponding
> > reserve memory node and propagate it to the higher boot stack.
> >
> > &L2 {
> >        andestech,pma-regions = <0x0 0x58000000 0x0 0x08000000
> >                                 (AX45MP_PMACFG_ETYP_NAPOT |
> >                                  AX45MP_PMACFG_MTYP_MEM_NON_CACHE_BUF)>;
> > };
> >
> > PMA regions are passed as part of L2 cache node to OpenSBI, these regions
> > are parsed and configured in the OpenSBI.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > ---
> > Hi All,
> >
> > This patch is based on the discussion [0] so sending this as an RFC
> > patch so that we get the Linux side of things accepeted first and once its
> > finalized I'll send a non RFC patch for this.
> >
> > [0] https://patchwork.kernel.org/project/linux-renesas-soc/patch/20221124172207.153718-8-prabhakar.mahadev-lad.rj at bp.renesas.com/
> >
> > Cheers,
> > Prabhakar
> > ---
> >  platform/generic/renesas/rzfive/objects.mk   |   1 +
> >  platform/generic/renesas/rzfive/rzfive-pma.c | 181 +++++++++++++++
> >  platform/generic/renesas/rzfive/rzfive-pma.h |  12 +
> 
> I feel we should name this to something like ax45mp-pma instead of
> rzfive-pma, as this is at the core configuration level not SoC's, no?

Agreed, Andes PMA CSRs also exist in A45MP (RV32) so it's better if we
call it andes45-pma.c and andes45_{read|write}_pma{cfg|addr} as function
name.

Any suggestion to add these functions which will be shared between the
platforms?

> 
> >  platform/generic/renesas/rzfive/rzfive.c     | 227 +++++++++++++++++++
> >  4 files changed, 421 insertions(+)
> >  create mode 100644 platform/generic/renesas/rzfive/rzfive-pma.c
> >  create mode 100644 platform/generic/renesas/rzfive/rzfive-pma.h
> >

Best regards,
Peter Lin