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PCI: tegra264: Add driver unbind support

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Add remove callback function support driver unbind.

Bug 4712048

Change-Id: I9c855d6403f187de1c93c00ba8cc270e4fed37f4
Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-t264/+/3163926
Reviewed-by: Nagarjuna Kristam <nkristam@nvidia.com>
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
This commit is contained in:
Manikanta Maddireddy
2024-06-23 18:10:55 +00:00
committed by Jon Hunter
parent 26c5dc150d
commit d091253965
1 changed files with 22 additions and 0 deletions
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22
drivers/pci/controller/private-soc/pcie-tegra264.c
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@@ -48,6 +48,7 @@ extern int of_get_pci_domain_nr(struct device_node *node);
struct tegra264_pcie {
struct device *dev;
struct pci_config_window *cfg;
struct pci_host_bridge *bridge;
void __iomem *xal_base;
void __iomem *xtl_pri_base;
void __iomem *ecam_base;
@@ -129,6 +130,7 @@ static int tegra264_pcie_probe(struct platform_device *pdev)
pcie = pci_host_bridge_priv(bridge);
pcie->dev = dev;
platform_set_drvdata(pdev, pcie);
pcie->bridge = bridge;
resource_list_for_each_entry(entry, &bridge->windows) {
struct resource *res = entry->res;
@@ -200,6 +202,25 @@ static int tegra264_pcie_probe(struct platform_device *pdev)
return ret;
}
static int tegra264_pcie_remove(struct platform_device *pdev)
{
struct tegra264_pcie *pcie = platform_get_drvdata(pdev);
/*
* If we undo tegra264_pcie_init() then link goes down and need controller reset to bring up
* the link again. Remove intention is to clean up the root bridge and re enumerate during
* bind.
*/
pci_lock_rescan_remove();
pci_stop_root_bus(pcie->bridge->bus);
pci_remove_root_bus(pcie->bridge->bus);
pci_unlock_rescan_remove();
pci_ecam_free(pcie->cfg);
return 0;
}
static int tegra264_pcie_resume_noirq(struct device *dev)
{
struct tegra264_pcie *pcie = dev_get_drvdata(dev);
@@ -222,6 +243,7 @@ static const struct of_device_id tegra264_pcie_of_match[] = {
static struct platform_driver tegra264_pcie_driver = {
.probe = tegra264_pcie_probe,
.remove = tegra264_pcie_remove,
.driver = {
.name = "tegra264-pcie",
.pm = &tegra264_pcie_pm_ops,