[PATCH 08/10] PCI: tegra: Add loadable kernel module support

Manikanta Maddireddy
2017-11-24T15:53:18Z

Implement remove call back function for Tegra PCIe driver to add
loadable kernel module support. Change PCI_TEGRA config to tristate to
allow pci-tegra driver to build as a module.

Signed-off-by: Manikanta Maddireddy <mmaddireddy-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
---
drivers/pci/host/Kconfig | 2 +-
drivers/pci/host/pci-tegra.c | 31 ++++++++++++++++++++++++++++++-
2 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index b868803792d8..15eb265461b2 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -34,7 +34,7 @@ config PCI_FTPCI100
default ARCH_GEMINI

config PCI_TEGRA
- bool "NVIDIA Tegra PCIe controller"
+ tristate "NVIDIA Tegra PCIe controller"
depends on ARCH_TEGRA
help
Say Y here if you want support for the PCIe host controller found
diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
index 09f52cd569c6..2ff1ac3aefc1 100644
--- a/drivers/pci/host/pci-tegra.c
+++ b/drivers/pci/host/pci-tegra.c
@@ -35,6 +35,7 @@
#include <linux/irqdomain.h>
#include <linux/kernel.h>
#include <linux/init.h>
+#include <linux/module.h>
#include <linux/msi.h>
#include <linux/of_address.h>
#include <linux/of_pci.h>
@@ -2700,6 +2701,12 @@ static int tegra_pcie_debugfs_init(struct tegra_pcie *pcie)
return -ENOMEM;
}

+static void tegra_pcie_debugfs_exit(struct tegra_pcie *pcie)
+{
+ debugfs_remove_recursive(pcie->debugfs);
+ pcie->debugfs = NULL;
+}
+
static int tegra_pcie_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -2714,6 +2721,7 @@ static int tegra_pcie_probe(struct platform_device *pdev)
return -ENOMEM;

pcie = pci_host_bridge_priv(host);
+ platform_set_drvdata(pdev, pcie);

pcie->soc = of_device_get_match_data(dev);
INIT_LIST_HEAD(&pcie->buses);
@@ -2796,6 +2804,25 @@ static int tegra_pcie_probe(struct platform_device *pdev)
return err;
}

+static int tegra_pcie_remove(struct platform_device *pdev)
+{
+ struct tegra_pcie *pcie = platform_get_drvdata(pdev);
+ struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
+
+ if (IS_ENABLED(CONFIG_DEBUG_FS))
+ tegra_pcie_debugfs_exit(pcie);
+ pci_stop_root_bus(host->bus);
+ pci_remove_root_bus(host->bus);
+ if (IS_ENABLED(CONFIG_PCI_MSI))
+ tegra_pcie_disable_msi(pcie);
+ tegra_pcie_disable_ports(pcie);
+ tegra_pcie_free_resources(pcie);
+ tegra_pcie_disable_controller(pcie);
+ tegra_pcie_put_resources(pcie);
+
+ return 0;
+}
+
static struct platform_driver tegra_pcie_driver = {
.driver = {
.name = "tegra-pcie",
@@ -2803,5 +2830,7 @@ static struct platform_driver tegra_pcie_driver = {
.suppress_bind_attrs = true,
},
.probe = tegra_pcie_probe,
+ .remove = tegra_pcie_remove,
};
-builtin_platform_driver(tegra_pcie_driver);
+module_platform_driver(tegra_pcie_driver);
+MODULE_LICENSE("GPL");
--
2.1.4