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

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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: Rob Herring <robh@kernel.org>
Signed-off-by: Lorenzo 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>
This commit is contained in:
Rob Herring
2020-08-20 21:53:44 -06:00
committed by Lorenzo Pieralisi
parent 444ddca524
commit 27e7ed0181
2 changed files with 20 additions and 0 deletions
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12
drivers/pci/controller/dwc/pcie-designware-host.c
View File

@@ -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,

8
drivers/pci/controller/dwc/pcie-designware.h
View File

@@ -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