[RFC 05/27] PCI: dwc: al: Use pci_ops for child config space accessors

[Rob Herring <robh@kernel.org>]

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

Cc: Jonathan Chocron <jonnyc@amazon.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Rob Herring <robh@kernel.org>
---
 drivers/pci/controller/dwc/pcie-al.c | 63 ++++++----------------------
 1 file changed, 13 insertions(+), 50 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-al.c b/drivers/pci/controller/dwc/pcie-al.c
index 270868f3859a..5c5763f14485 100644
--- a/drivers/pci/controller/dwc/pcie-al.c
+++ b/drivers/pci/controller/dwc/pcie-al.c
@@ -222,14 +222,15 @@ static inline void al_pcie_target_bus_set(struct al_pcie *pcie,
 				  reg);
 }
 
-static void __iomem *al_pcie_conf_addr_map(struct al_pcie *pcie,
-					   unsigned int busnr,
-					   unsigned int devfn)
+static void __iomem *al_pcie_conf_addr_map_bus(struct pci_bus *bus,
+					       unsigned int devfn, int where)
 {
+	struct pcie_port *pp = bus->sysdata;
+	struct al_pcie *pcie = to_al_pcie(to_dw_pcie_from_pp(pp));
+	unsigned int busnr = bus->number;
 	struct al_pcie_target_bus_cfg *target_bus_cfg = &pcie->target_bus_cfg;
 	unsigned int busnr_ecam = busnr & target_bus_cfg->ecam_mask;
 	unsigned int busnr_reg = busnr & target_bus_cfg->reg_mask;
-	struct pcie_port *pp = &pcie->pci->pp;
 	void __iomem *pci_base_addr;
 
 	pci_base_addr = (void __iomem *)((uintptr_t)pp->va_cfg0_base +
@@ -245,52 +246,14 @@ static void __iomem *al_pcie_conf_addr_map(struct al_pcie *pcie,
 				       target_bus_cfg->reg_mask);
 	}
 
-	return pci_base_addr;
-}
-
-static int al_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
-				 unsigned int devfn, int where, int size,
-				 u32 *val)
-{
-	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
-	struct al_pcie *pcie = to_al_pcie(pci);
-	unsigned int busnr = bus->number;
-	void __iomem *pci_addr;
-	int rc;
-
-	pci_addr = al_pcie_conf_addr_map(pcie, busnr, devfn);
-
-	rc = dw_pcie_read(pci_addr + where, size, val);
-
-	dev_dbg(pci->dev, "%d-byte config read from %04x:%02x:%02x.%d offset 0x%x (pci_addr: 0x%px) - val:0x%x\n",
-		size, pci_domain_nr(bus), bus->number,
-		PCI_SLOT(devfn), PCI_FUNC(devfn), where,
-		(pci_addr + where), *val);
-
-	return rc;
+	return pci_base_addr + where;
 }
 
-static int al_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
-				 unsigned int devfn, int where, int size,
-				 u32 val)
-{
-	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
-	struct al_pcie *pcie = to_al_pcie(pci);
-	unsigned int busnr = bus->number;
-	void __iomem *pci_addr;
-	int rc;
-
-	pci_addr = al_pcie_conf_addr_map(pcie, busnr, devfn);
-
-	rc = dw_pcie_write(pci_addr + where, size, val);
-
-	dev_dbg(pci->dev, "%d-byte config write to %04x:%02x:%02x.%d offset 0x%x (pci_addr: 0x%px) - val:0x%x\n",
-		size, pci_domain_nr(bus), bus->number,
-		PCI_SLOT(devfn), PCI_FUNC(devfn), where,
-		(pci_addr + where), val);
-
-	return rc;
-}
+static struct pci_ops al_child_pci_ops = {
+	.map_bus = al_pcie_conf_addr_map_bus,
+	.read = pci_generic_config_read,
+	.write = pci_generic_config_write,
+};
 
 static void al_pcie_config_prepare(struct al_pcie *pcie)
 {
@@ -344,6 +307,8 @@ static int al_pcie_host_init(struct pcie_port *pp)
 	struct al_pcie *pcie = to_al_pcie(pci);
 	int rc;
 
+	pp->bridge->child_ops = &al_child_pci_ops;
+
 	rc = al_pcie_rev_id_get(pcie, &pcie->controller_rev_id);
 	if (rc)
 		return rc;
@@ -358,8 +323,6 @@ static int al_pcie_host_init(struct pcie_port *pp)
 }
 
 static const struct dw_pcie_host_ops al_pcie_host_ops = {
-	.rd_other_conf = al_pcie_rd_other_conf,
-	.wr_other_conf = al_pcie_wr_other_conf,
 	.host_init = al_pcie_host_init,
 };
 
-- 
2.25.1