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PCI: dwc: keystone: Convert .scan_bus() callback to use add_bus
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TI keystone is the only Designware driver using .scan_bus(). This
function pointer is the only thing preventing the Designware driver from
using pci_host_probe(). Let's use the pci_ops.add_bus hook instead.

Link: https://lore.kernel.org/r/20200821035420.380495-16-robh@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Murali Karicheri <m-karicheri2@ti.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
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Rob Herring authored and Lorenzo Pieralisi committed Sep 8, 2020
1 parent 6e8e104 commit 6ab15b5
Showing 1 changed file with 9 additions and 3 deletions.
12 changes: 9 additions & 3 deletions drivers/pci/controller/dwc/pci-keystone.c
Original file line number Diff line number Diff line change
Expand Up @@ -454,15 +454,19 @@ static struct pci_ops ks_child_pcie_ops = {
};

/**
* ks_pcie_v3_65_scan_bus() - keystone scan_bus post initialization
* ks_pcie_v3_65_add_bus() - keystone add_bus post initialization
*
* This sets BAR0 to enable inbound access for MSI_IRQ register
*/
static void ks_pcie_v3_65_scan_bus(struct pcie_port *pp)
static int ks_pcie_v3_65_add_bus(struct pci_bus *bus)
{
struct pcie_port *pp = bus->sysdata;
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);

if (!pci_is_root_bus(bus))
return 0;

/* Configure and set up BAR0 */
ks_pcie_set_dbi_mode(ks_pcie);

Expand All @@ -477,12 +481,15 @@ static void ks_pcie_v3_65_scan_bus(struct pcie_port *pp)
* be sufficient. Use physical address to avoid any conflicts.
*/
dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, ks_pcie->app.start);

return 0;
}

static struct pci_ops ks_pcie_ops = {
.map_bus = dw_pcie_own_conf_map_bus,
.read = pci_generic_config_read,
.write = pci_generic_config_write,
.add_bus = ks_pcie_v3_65_add_bus,
};

/**
Expand Down Expand Up @@ -842,7 +849,6 @@ static int __init ks_pcie_host_init(struct pcie_port *pp)
static const struct dw_pcie_host_ops ks_pcie_host_ops = {
.host_init = ks_pcie_host_init,
.msi_host_init = ks_pcie_msi_host_init,
.scan_bus = ks_pcie_v3_65_scan_bus,
};

static const struct dw_pcie_host_ops ks_pcie_am654_host_ops = {
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