[RFC 11/27] PCI: dwc: histb: Use pci_ops for root config space accessors

[Rob Herring]

Now that DWC drivers can setup their own pci_ops for the root and child
buses, convert the HiSilicon histb driver to use the standard pci_ops
for root bus config accesses.

Cc: Shawn Guo <shawn.guo at linaro.org>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi at arm.com>
Cc: Bjorn Helgaas <bhelgaas at google.com>
Signed-off-by: Rob Herring <robh at kernel.org>
---
 drivers/pci/controller/dwc/pcie-histb.c | 41 ++++++++++++++-----------
 1 file changed, 23 insertions(+), 18 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-histb.c b/drivers/pci/controller/dwc/pcie-histb.c
index 811b5c6d62ea..0d93088deea3 100644
--- a/drivers/pci/controller/dwc/pcie-histb.c
+++ b/drivers/pci/controller/dwc/pcie-histb.c
@@ -122,32 +122,37 @@ static void histb_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base,
 	histb_pcie_dbi_w_mode(&pci->pp, false);
 }
 
-static int histb_pcie_rd_own_conf(struct pcie_port *pp, int where,
-				  int size, u32 *val)
+static int histb_pcie_rd_own_conf(struct pci_bus *bus, unsigned int devfn,
+				  int where, int size, u32 *val)
 {
-	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
-	int ret;
+	struct dw_pcie *pci = to_dw_pcie_from_pp(bus->sysdata);
 
-	histb_pcie_dbi_r_mode(pp, true);
-	ret = dw_pcie_read(pci->dbi_base + where, size, val);
-	histb_pcie_dbi_r_mode(pp, false);
+	if (PCI_SLOT(devfn)) {
+		*val = ~0;
+		return PCIBIOS_DEVICE_NOT_FOUND;
+	}
 
-	return ret;
+	*val = dw_pcie_read_dbi(pci, where, size);
+	return PCIBIOS_SUCCESSFUL;
 }
 
-static int histb_pcie_wr_own_conf(struct pcie_port *pp, int where,
-				  int size, u32 val)
+static int histb_pcie_wr_own_conf(struct pci_bus *bus, unsigned int devfn,
+				  int where, int size, u32 val)
 {
-	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
-	int ret;
+	struct dw_pcie *pci = to_dw_pcie_from_pp(bus->sysdata);
 
-	histb_pcie_dbi_w_mode(pp, true);
-	ret = dw_pcie_write(pci->dbi_base + where, size, val);
-	histb_pcie_dbi_w_mode(pp, false);
+	if (PCI_SLOT(devfn))
+		return PCIBIOS_DEVICE_NOT_FOUND;
 
-	return ret;
+	dw_pcie_write_dbi(pci, where, size, val);
+	return PCIBIOS_SUCCESSFUL;
 }
 
+static struct pci_ops histb_pci_ops = {
+	.read = histb_pcie_rd_own_conf,
+	.write = histb_pcie_wr_own_conf,
+};
+
 static int histb_pcie_link_up(struct dw_pcie *pci)
 {
 	struct histb_pcie *hipcie = to_histb_pcie(pci);
@@ -194,6 +199,8 @@ static int histb_pcie_establish_link(struct pcie_port *pp)
 
 static int histb_pcie_host_init(struct pcie_port *pp)
 {
+	pp->bridge->ops = &histb_pci_ops;
+
 	histb_pcie_establish_link(pp);
 
 	if (IS_ENABLED(CONFIG_PCI_MSI))
@@ -203,8 +210,6 @@ static int histb_pcie_host_init(struct pcie_port *pp)
 }
 
 static const struct dw_pcie_host_ops histb_pcie_host_ops = {
-	.rd_own_conf = histb_pcie_rd_own_conf,
-	.wr_own_conf = histb_pcie_wr_own_conf,
 	.host_init = histb_pcie_host_init,
 };
 
-- 
2.25.1