On Fri, Aug 21, 2020 at 1:05 AM Kunihiko Hayashi
<hayashi.kunihiko@xxxxxxxxxxxxx> wrote:
>
> On 2020/08/18 1:48, Rob Herring wrote:
> > On Fri, Aug 7, 2020 at 4:25 AM Kunihiko Hayashi
> > <hayashi.kunihiko@xxxxxxxxxxxxx> wrote:
> >>
> >> This gets iATU register area from reg property. In Synopsys DWC version
> >> 4.80 or later, since iATU register area is separated from core register
> >> area, this area is necessary to get from DT independently.
> >>
> >> Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@xxxxxxxxxxxxx>
> >> ---
> >> drivers/pci/controller/dwc/pcie-uniphier.c | 5 +++++
> >> 1 file changed, 5 insertions(+)
> >>
> >> diff --git a/drivers/pci/controller/dwc/pcie-uniphier.c b/drivers/pci/controller/dwc/pcie-uniphier.c
> >> index 55a7166..93ef608 100644
> >> --- a/drivers/pci/controller/dwc/pcie-uniphier.c
> >> +++ b/drivers/pci/controller/dwc/pcie-uniphier.c
> >> @@ -471,6 +471,11 @@ static int uniphier_pcie_probe(struct platform_device *pdev)
> >> if (IS_ERR(priv->pci.dbi_base))
> >> return PTR_ERR(priv->pci.dbi_base);
> >>
> >> + priv->pci.atu_base =
> >> + devm_platform_ioremap_resource_byname(pdev, "atu");
> >> + if (IS_ERR(priv->pci.atu_base))
> >> + priv->pci.atu_base = NULL;
> >
> > Keystone has the same 'atu' resource setup. Please move its code to
> > the DW core and use that.
>
> There are some platforms that pci.atu_base is set by other way.
> The 'atu' code shouldn't be conflicted with the following existing code.
No, it's not a conflict but needless duplication.
> drivers/pci/controller/dwc/pci-keystone.c: atu_base = devm_platform_ioremap_resource_byname(pdev, "atu");
> drivers/pci/controller/dwc/pci-keystone.c: pci->atu_base = atu_base;
> drivers/pci/controller/dwc/pcie-designware.c: pci->atu_base = pci->dbi_base + DEFAULT_DBI_ATU_OFFSET;
> drivers/pci/controller/dwc/pcie-intel-gw.c: pci->atu_base = pci->dbi_base + data->pcie_atu_offset;
This one should have had an 'atu' region in DT.
> drivers/pci/controller/dwc/pcie-tegra194.c: pci->atu_base = devm_ioremap_resource(dev, atu_dma_res);
Unfortunately, a different name was used. That is the mess which is
the DW PCI controller.
>
> So I'm not sure where to move the code in the DW core.
> Is there any idea?
You just need this and then remove the keystone code:
diff --git a/drivers/pci/controller/dwc/pcie-designware.c
b/drivers/pci/controller/dwc/pcie-designware.c
index b723e0cc41fb..680084467447 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -556,6 +556,8 @@ void dw_pcie_setup(struct dw_pcie *pci)
dw_pcie_iatu_unroll_enabled(pci))) {
pci->iatu_unroll_enabled = true;
if (!pci->atu_base)
+ pci->atu_base =
devm_platform_ioremap_resource_byname(pdev, "atu");
+ if (IS_ERR(pci->atu_base))
pci->atu_base = pci->dbi_base + DEFAULT_DBI_ATU_OFFSET;
}
dev_dbg(pci->dev, "iATU unroll: %s\n", pci->iatu_unroll_enabled ?
