Commit 27e7ed01 authored by Rob Herring's avatar Rob Herring Committed by Lorenzo Pieralisi
Browse files

PCI: dwc: Add a default pci_ops.map_bus for root port 

The Designware root port config space is memory mapped accesses via the
DBI space by default. Add a common implementation
dw_pcie_own_conf_map_bus() for platforms to use.

Link: https://lore.kernel.org/r/20200821035420.380495-5-robh@kernel.org


Signed-off-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Jingoo Han <jingoohan1@gmail.com>
Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
parent 444ddca5

drivers/pci/controller/dwc/pcie-designware-host.c

+12 −0
Original line number Diff line number Diff line
@@ -602,6 +602,18 @@ static int dw_pcie_wr_conf(struct pci_bus *bus, u32 devfn, 
	return dw_pcie_wr_other_conf(pp, bus, devfn, where, size, val);

}



void __iomem *dw_pcie_own_conf_map_bus(struct pci_bus *bus, unsigned int devfn, int where)

{

	struct pcie_port *pp = bus->sysdata;

	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);



	if (PCI_SLOT(devfn) > 0)

		return NULL;



	return pci->dbi_base + where;

}

EXPORT_SYMBOL_GPL(dw_pcie_own_conf_map_bus);



static struct pci_ops dw_pcie_ops = {

	.read = dw_pcie_rd_conf,

	.write = dw_pcie_wr_conf,

drivers/pci/controller/dwc/pcie-designware.h

+8 −0
Original line number Diff line number Diff line
@@ -377,6 +377,8 @@ void dw_pcie_setup_rc(struct pcie_port *pp); 
int dw_pcie_host_init(struct pcie_port *pp);

void dw_pcie_host_deinit(struct pcie_port *pp);

int dw_pcie_allocate_domains(struct pcie_port *pp);

void __iomem *dw_pcie_own_conf_map_bus(struct pci_bus *bus, unsigned int devfn,

				       int where);

#else

static inline irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)

{
@@ -408,6 +410,12 @@ static inline int dw_pcie_allocate_domains(struct pcie_port *pp) 
{

	return 0;

}

static inline void __iomem *dw_pcie_own_conf_map_bus(struct pci_bus *bus,

						     unsigned int devfn,

						     int where)

{

	return NULL;

}

#endif



#ifdef CONFIG_PCIE_DW_EP

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