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Message-ID: <1539582287-9171-10-git-send-email-honghui.zhang@mediatek.com>
Date: Mon, 15 Oct 2018 13:44:47 +0800
From: <honghui.zhang@...iatek.com>
To: <lorenzo.pieralisi@....com>, <bhelgaas@...gle.com>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-mediatek@...ts.infradead.org>, <linux-pci@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <ryder.lee@...iatek.com>
CC: <ulf.hansson@...aro.org>, <marc.zyngier@....com>,
<matthias.bgg@...il.com>, <devicetree@...r.kernel.org>,
<yingjoe.chen@...iatek.com>, <eddie.huang@...iatek.com>,
<honghui.zhang@...iatek.com>, <youlin.pei@...iatek.com>,
<yt.shen@...iatek.com>, <jianjun.wang@...iatek.com>
Subject: [PATCH v7 9/9] PCI: mediatek: Add loadable kernel module support
From: Honghui Zhang <honghui.zhang@...iatek.com>
Implement remove callback function for Mediatek PCIe driver to add
loadable kernel module support.
Signed-off-by: Honghui Zhang <honghui.zhang@...iatek.com>
Reviewed-by: Ryder Lee <ryder.lee@...iatek.com>
---
drivers/pci/controller/Kconfig | 2 +-
drivers/pci/controller/pcie-mediatek.c | 51 +++++++++++++++++++++++++++++++++-
2 files changed, 51 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
index 028b287..465790f 100644
--- a/drivers/pci/controller/Kconfig
+++ b/drivers/pci/controller/Kconfig
@@ -231,7 +231,7 @@ config PCIE_ROCKCHIP_EP
available to support GEN2 with 4 slots.
config PCIE_MEDIATEK
- bool "MediaTek PCIe controller"
+ tristate "MediaTek PCIe controller"
depends on ARCH_MEDIATEK || COMPILE_TEST
depends on OF
depends on PCI_MSI_IRQ_DOMAIN
diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
index daba78f..5048adb 100644
--- a/drivers/pci/controller/pcie-mediatek.c
+++ b/drivers/pci/controller/pcie-mediatek.c
@@ -15,6 +15,7 @@
#include <linux/irqdomain.h>
#include <linux/kernel.h>
#include <linux/msi.h>
+#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_pci.h>
#include <linux/of_platform.h>
@@ -532,6 +533,27 @@ static void mtk_pcie_enable_msi(struct mtk_pcie_port *port)
writel(val, port->base + PCIE_INT_MASK);
}
+static void mtk_pcie_irq_teardown(struct mtk_pcie *pcie)
+{
+ struct mtk_pcie_port *port, *tmp;
+
+ list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
+ irq_set_chained_handler_and_data(port->irq, NULL, NULL);
+
+ if (port->irq_domain)
+ irq_domain_remove(port->irq_domain);
+
+ if (IS_ENABLED(CONFIG_PCI_MSI)) {
+ if (port->msi_domain)
+ irq_domain_remove(port->msi_domain);
+ if (port->inner_domain)
+ irq_domain_remove(port->inner_domain);
+ }
+
+ irq_dispose_mapping(port->irq);
+ }
+}
+
static int mtk_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
irq_hw_number_t hwirq)
{
@@ -1171,6 +1193,31 @@ static int mtk_pcie_probe(struct platform_device *pdev)
return err;
}
+
+static void mtk_pcie_free_resources(struct mtk_pcie *pcie)
+{
+ struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
+ struct list_head *windows = &host->windows;
+
+ pci_free_resource_list(windows);
+}
+
+static int mtk_pcie_remove(struct platform_device *pdev)
+{
+ struct mtk_pcie *pcie = platform_get_drvdata(pdev);
+ struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
+
+ pci_stop_root_bus(host->bus);
+ pci_remove_root_bus(host->bus);
+ mtk_pcie_free_resources(pcie);
+
+ mtk_pcie_irq_teardown(pcie);
+
+ mtk_pcie_put_resources(pcie);
+
+ return 0;
+}
+
static int __maybe_unused mtk_pcie_suspend_noirq(struct device *dev)
{
struct mtk_pcie *pcie = dev_get_drvdata(dev);
@@ -1248,6 +1295,7 @@ static const struct of_device_id mtk_pcie_ids[] = {
static struct platform_driver mtk_pcie_driver = {
.probe = mtk_pcie_probe,
+ .remove = mtk_pcie_remove,
.driver = {
.name = "mtk-pcie",
.of_match_table = mtk_pcie_ids,
@@ -1255,4 +1303,5 @@ static struct platform_driver mtk_pcie_driver = {
.pm = &mtk_pcie_pm_ops,
},
};
-builtin_platform_driver(mtk_pcie_driver);
+module_platform_driver(mtk_pcie_driver);
+MODULE_LICENSE("GPL v2");
--
2.6.4
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