diff mbox series

[v8,4/7] PCI: mediatek-gen3: Add INTx support

Message ID 20210224061132.26526-5-jianjun.wang@mediatek.com
State New
Headers show
Series PCI: mediatek: Add new generation controller support | expand

Commit Message

Jianjun Wang (王建军) Feb. 24, 2021, 6:11 a.m. UTC 
Add INTx support for MediaTek Gen3 PCIe controller.

Signed-off-by: Jianjun Wang <jianjun.wang@mediatek.com>
Acked-by: Ryder Lee <ryder.lee@mediatek.com>
---
 drivers/pci/controller/pcie-mediatek-gen3.c | 176 ++++++++++++++++++++
 1 file changed, 176 insertions(+)

Comments

Krzysztof Wilczyński Feb. 24, 2021, 2:24 p.m. UTC | #1 
Hi Jianjun,

[...]
> +/**
> + * mtk_intx_eoi
> + * @data: pointer to chip specific data
> + *
> + * As an emulated level IRQ, its interrupt status will remain
> + * until the corresponding de-assert message is received; hence that
> + * the status can only be cleared when the interrupt has been serviced.
> + */
[...]

See my comment about the kernel-doc from the following:

  https://lore.kernel.org/linux-pci/YDZWUGcKet%2FlNWlF@rocinante/

[...]
> +	if (err) {
> +		dev_err(dev, "failed to init PCIe IRQ domain\n");
> +		return err;
> +	}
[...]

Just a nitpick.  What about using "initialize" in the above?

Krzysztof
Jianjun Wang (王建军) Feb. 25, 2021, 3:10 a.m. UTC | #2 
Hi Krzysztof,

Thanks for your review, I will fix it at next version.

On Wed, 2021-02-24 at 15:24 +0100, Krzysztof Wilczyński wrote:
> Hi Jianjun,
> 
> [...]
> > +/**
> > + * mtk_intx_eoi
> > + * @data: pointer to chip specific data
> > + *
> > + * As an emulated level IRQ, its interrupt status will remain
> > + * until the corresponding de-assert message is received; hence that
> > + * the status can only be cleared when the interrupt has been serviced.
> > + */
> [...]
> 
> See my comment about the kernel-doc from the following:
> 
>   https://lore.kernel.org/linux-pci/YDZWUGcKet%2FlNWlF@rocinante/
> 
> [...]
> > +	if (err) {
> > +		dev_err(dev, "failed to init PCIe IRQ domain\n");
> > +		return err;
> > +	}
> [...]
> 
> Just a nitpick.  What about using "initialize" in the above?
> 
> Krzysztof

Thanks.
Marc Zyngier March 9, 2021, 11:10 a.m. UTC | #3 
On Wed, 24 Feb 2021 06:11:29 +0000,
Jianjun Wang <jianjun.wang@mediatek.com> wrote:
> 
> Add INTx support for MediaTek Gen3 PCIe controller.
> 
> Signed-off-by: Jianjun Wang <jianjun.wang@mediatek.com>
> Acked-by: Ryder Lee <ryder.lee@mediatek.com>
> ---
>  drivers/pci/controller/pcie-mediatek-gen3.c | 176 ++++++++++++++++++++
>  1 file changed, 176 insertions(+)
> 
> diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/controller/pcie-mediatek-gen3.c
> index c602beb9afec..8b3b5f838b69 100644
> --- a/drivers/pci/controller/pcie-mediatek-gen3.c
> +++ b/drivers/pci/controller/pcie-mediatek-gen3.c
> @@ -9,6 +9,9 @@
>  #include <linux/clk.h>
>  #include <linux/delay.h>
>  #include <linux/iopoll.h>
> +#include <linux/irq.h>
> +#include <linux/irqchip/chained_irq.h>
> +#include <linux/irqdomain.h>
>  #include <linux/kernel.h>
>  #include <linux/module.h>
>  #include <linux/pci.h>
> @@ -45,6 +48,13 @@
>  #define PCIE_LINK_STATUS_REG		0x154
>  #define PCIE_PORT_LINKUP		BIT(8)
>  
> +#define PCIE_INT_ENABLE_REG		0x180
> +#define PCIE_INTX_SHIFT			24
> +#define PCIE_INTX_ENABLE \
> +	GENMASK(PCIE_INTX_SHIFT + PCI_NUM_INTX - 1, PCIE_INTX_SHIFT)
> +
> +#define PCIE_INT_STATUS_REG		0x184
> +
>  #define PCIE_TRANS_TABLE_BASE_REG	0x800
>  #define PCIE_ATR_SRC_ADDR_MSB_OFFSET	0x4
>  #define PCIE_ATR_TRSL_ADDR_LSB_OFFSET	0x8
> @@ -73,6 +83,9 @@
>   * @phy: PHY controller block
>   * @clks: PCIe clocks
>   * @num_clks: PCIe clocks count for this port
> + * @irq: PCIe controller interrupt number
> + * @irq_lock: lock protecting IRQ register access
> + * @intx_domain: legacy INTx IRQ domain
>   */
>  struct mtk_pcie_port {
>  	struct device *dev;
> @@ -83,6 +96,10 @@ struct mtk_pcie_port {
>  	struct phy *phy;
>  	struct clk_bulk_data *clks;
>  	int num_clks;
> +
> +	int irq;
> +	raw_spinlock_t irq_lock;
> +	struct irq_domain *intx_domain;
>  };
>  
>  /**
> @@ -199,6 +216,11 @@ static int mtk_pcie_startup_port(struct mtk_pcie_port *port)
>  	val |= PCI_CLASS(PCI_CLASS_BRIDGE_PCI << 8);
>  	writel_relaxed(val, port->base + PCIE_PCI_IDS_1);
>  
> +	/* Mask all INTx interrupts */
> +	val = readl_relaxed(port->base + PCIE_INT_ENABLE_REG);
> +	val &= ~PCIE_INTX_ENABLE;
> +	writel_relaxed(val, port->base + PCIE_INT_ENABLE_REG);
> +
>  	/* Assert all reset signals */
>  	val = readl_relaxed(port->base + PCIE_RST_CTRL_REG);
>  	val |= PCIE_MAC_RSTB | PCIE_PHY_RSTB | PCIE_BRG_RSTB | PCIE_PE_RSTB;
> @@ -262,6 +284,154 @@ static int mtk_pcie_startup_port(struct mtk_pcie_port *port)
>  	return 0;
>  }
>  
> +static int mtk_pcie_set_affinity(struct irq_data *data,
> +				 const struct cpumask *mask, bool force)
> +{
> +	return -EINVAL;
> +}
> +
> +static void mtk_intx_mask(struct irq_data *data)
> +{
> +	struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
> +	unsigned long flags;
> +	u32 val;
> +
> +	raw_spin_lock_irqsave(&port->irq_lock, flags);
> +	val = readl_relaxed(port->base + PCIE_INT_ENABLE_REG);
> +	val &= ~BIT(data->hwirq + PCIE_INTX_SHIFT);
> +	writel_relaxed(val, port->base + PCIE_INT_ENABLE_REG);
> +	raw_spin_unlock_irqrestore(&port->irq_lock, flags);
> +}
> +
> +static void mtk_intx_unmask(struct irq_data *data)
> +{
> +	struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
> +	unsigned long flags;
> +	u32 val;
> +
> +	raw_spin_lock_irqsave(&port->irq_lock, flags);
> +	val = readl_relaxed(port->base + PCIE_INT_ENABLE_REG);
> +	val |= BIT(data->hwirq + PCIE_INTX_SHIFT);
> +	writel_relaxed(val, port->base + PCIE_INT_ENABLE_REG);
> +	raw_spin_unlock_irqrestore(&port->irq_lock, flags);
> +}
> +
> +/**
> + * mtk_intx_eoi
> + * @data: pointer to chip specific data
> + *
> + * As an emulated level IRQ, its interrupt status will remain
> + * until the corresponding de-assert message is received; hence that
> + * the status can only be cleared when the interrupt has been serviced.
> + */
> +static void mtk_intx_eoi(struct irq_data *data)
> +{
> +	struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
> +	unsigned long hwirq;
> +
> +	hwirq = data->hwirq + PCIE_INTX_SHIFT;
> +	writel_relaxed(BIT(hwirq), port->base + PCIE_INT_STATUS_REG);
> +}
> +
> +static struct irq_chip mtk_intx_irq_chip = {
> +	.irq_enable		= mtk_intx_unmask,
> +	.irq_disable		= mtk_intx_mask,

Please get rid of enable/disable. Given that you already have
mask/unmask with the *same* implementation, this offers zero benefit.

> +	.irq_mask		= mtk_intx_mask,
> +	.irq_unmask		= mtk_intx_unmask,
> +	.irq_eoi		= mtk_intx_eoi,
> +	.irq_set_affinity	= mtk_pcie_set_affinity,
> +	.name			= "INTx",
> +};

[...]

Other that that, this look good to me.

Thanks,

	M.
Jianjun Wang (王建军) March 10, 2021, 3:05 a.m. UTC | #4 
On Tue, 2021-03-09 at 11:10 +0000, Marc Zyngier wrote:
> On Wed, 24 Feb 2021 06:11:29 +0000,
> Jianjun Wang <jianjun.wang@mediatek.com> wrote:
> > 
> > Add INTx support for MediaTek Gen3 PCIe controller.
> > 
> > Signed-off-by: Jianjun Wang <jianjun.wang@mediatek.com>
> > Acked-by: Ryder Lee <ryder.lee@mediatek.com>
> > ---
> >  drivers/pci/controller/pcie-mediatek-gen3.c | 176 ++++++++++++++++++++
> >  1 file changed, 176 insertions(+)
> > 
> > diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/controller/pcie-mediatek-gen3.c
> > index c602beb9afec..8b3b5f838b69 100644
> > --- a/drivers/pci/controller/pcie-mediatek-gen3.c
> > +++ b/drivers/pci/controller/pcie-mediatek-gen3.c
> > @@ -9,6 +9,9 @@
> >  #include <linux/clk.h>
> >  #include <linux/delay.h>
> >  #include <linux/iopoll.h>
> > +#include <linux/irq.h>
> > +#include <linux/irqchip/chained_irq.h>
> > +#include <linux/irqdomain.h>
> >  #include <linux/kernel.h>
> >  #include <linux/module.h>
> >  #include <linux/pci.h>
> > @@ -45,6 +48,13 @@
> >  #define PCIE_LINK_STATUS_REG		0x154
> >  #define PCIE_PORT_LINKUP		BIT(8)
> >  
> > +#define PCIE_INT_ENABLE_REG		0x180
> > +#define PCIE_INTX_SHIFT			24
> > +#define PCIE_INTX_ENABLE \
> > +	GENMASK(PCIE_INTX_SHIFT + PCI_NUM_INTX - 1, PCIE_INTX_SHIFT)
> > +
> > +#define PCIE_INT_STATUS_REG		0x184
> > +
> >  #define PCIE_TRANS_TABLE_BASE_REG	0x800
> >  #define PCIE_ATR_SRC_ADDR_MSB_OFFSET	0x4
> >  #define PCIE_ATR_TRSL_ADDR_LSB_OFFSET	0x8
> > @@ -73,6 +83,9 @@
> >   * @phy: PHY controller block
> >   * @clks: PCIe clocks
> >   * @num_clks: PCIe clocks count for this port
> > + * @irq: PCIe controller interrupt number
> > + * @irq_lock: lock protecting IRQ register access
> > + * @intx_domain: legacy INTx IRQ domain
> >   */
> >  struct mtk_pcie_port {
> >  	struct device *dev;
> > @@ -83,6 +96,10 @@ struct mtk_pcie_port {
> >  	struct phy *phy;
> >  	struct clk_bulk_data *clks;
> >  	int num_clks;
> > +
> > +	int irq;
> > +	raw_spinlock_t irq_lock;
> > +	struct irq_domain *intx_domain;
> >  };
> >  
> >  /**
> > @@ -199,6 +216,11 @@ static int mtk_pcie_startup_port(struct mtk_pcie_port *port)
> >  	val |= PCI_CLASS(PCI_CLASS_BRIDGE_PCI << 8);
> >  	writel_relaxed(val, port->base + PCIE_PCI_IDS_1);
> >  
> > +	/* Mask all INTx interrupts */
> > +	val = readl_relaxed(port->base + PCIE_INT_ENABLE_REG);
> > +	val &= ~PCIE_INTX_ENABLE;
> > +	writel_relaxed(val, port->base + PCIE_INT_ENABLE_REG);
> > +
> >  	/* Assert all reset signals */
> >  	val = readl_relaxed(port->base + PCIE_RST_CTRL_REG);
> >  	val |= PCIE_MAC_RSTB | PCIE_PHY_RSTB | PCIE_BRG_RSTB | PCIE_PE_RSTB;
> > @@ -262,6 +284,154 @@ static int mtk_pcie_startup_port(struct mtk_pcie_port *port)
> >  	return 0;
> >  }
> >  
> > +static int mtk_pcie_set_affinity(struct irq_data *data,
> > +				 const struct cpumask *mask, bool force)
> > +{
> > +	return -EINVAL;
> > +}
> > +
> > +static void mtk_intx_mask(struct irq_data *data)
> > +{
> > +	struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
> > +	unsigned long flags;
> > +	u32 val;
> > +
> > +	raw_spin_lock_irqsave(&port->irq_lock, flags);
> > +	val = readl_relaxed(port->base + PCIE_INT_ENABLE_REG);
> > +	val &= ~BIT(data->hwirq + PCIE_INTX_SHIFT);
> > +	writel_relaxed(val, port->base + PCIE_INT_ENABLE_REG);
> > +	raw_spin_unlock_irqrestore(&port->irq_lock, flags);
> > +}
> > +
> > +static void mtk_intx_unmask(struct irq_data *data)
> > +{
> > +	struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
> > +	unsigned long flags;
> > +	u32 val;
> > +
> > +	raw_spin_lock_irqsave(&port->irq_lock, flags);
> > +	val = readl_relaxed(port->base + PCIE_INT_ENABLE_REG);
> > +	val |= BIT(data->hwirq + PCIE_INTX_SHIFT);
> > +	writel_relaxed(val, port->base + PCIE_INT_ENABLE_REG);
> > +	raw_spin_unlock_irqrestore(&port->irq_lock, flags);
> > +}
> > +
> > +/**
> > + * mtk_intx_eoi
> > + * @data: pointer to chip specific data
> > + *
> > + * As an emulated level IRQ, its interrupt status will remain
> > + * until the corresponding de-assert message is received; hence that
> > + * the status can only be cleared when the interrupt has been serviced.
> > + */
> > +static void mtk_intx_eoi(struct irq_data *data)
> > +{
> > +	struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
> > +	unsigned long hwirq;
> > +
> > +	hwirq = data->hwirq + PCIE_INTX_SHIFT;
> > +	writel_relaxed(BIT(hwirq), port->base + PCIE_INT_STATUS_REG);
> > +}
> > +
> > +static struct irq_chip mtk_intx_irq_chip = {
> > +	.irq_enable		= mtk_intx_unmask,
> > +	.irq_disable		= mtk_intx_mask,
> 
> Please get rid of enable/disable. Given that you already have
> mask/unmask with the *same* implementation, this offers zero benefit.

Hi Marc,

Thanks for your review.

We need to support suspend/resume feature, the HW will be powered off
when the system is suspended, and its register value will be cleared. If
the enable/disable callback is not implemented, the unmask function will
not be called when the system resume, so INTx will remain disabled.

Can I keep the enable/disable callback? Or do we have any solutions to
restore the register value when the system resume?

Thanks.
> 
> > +	.irq_mask		= mtk_intx_mask,
> > +	.irq_unmask		= mtk_intx_unmask,
> > +	.irq_eoi		= mtk_intx_eoi,
> > +	.irq_set_affinity	= mtk_pcie_set_affinity,
> > +	.name			= "INTx",
> > +};
> 
> [...]
> 
> Other that that, this look good to me.
> 
> Thanks,
> 
> 	M.
>
diff mbox series

Patch

diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/controller/pcie-mediatek-gen3.c
index c602beb9afec..8b3b5f838b69 100644
--- a/drivers/pci/controller/pcie-mediatek-gen3.c
+++ b/drivers/pci/controller/pcie-mediatek-gen3.c
@@ -9,6 +9,9 @@ 
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/iopoll.h>
+#include <linux/irq.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/irqdomain.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>
@@ -45,6 +48,13 @@ 
 #define PCIE_LINK_STATUS_REG		0x154
 #define PCIE_PORT_LINKUP		BIT(8)
 
+#define PCIE_INT_ENABLE_REG		0x180
+#define PCIE_INTX_SHIFT			24
+#define PCIE_INTX_ENABLE \
+	GENMASK(PCIE_INTX_SHIFT + PCI_NUM_INTX - 1, PCIE_INTX_SHIFT)
+
+#define PCIE_INT_STATUS_REG		0x184
+
 #define PCIE_TRANS_TABLE_BASE_REG	0x800
 #define PCIE_ATR_SRC_ADDR_MSB_OFFSET	0x4
 #define PCIE_ATR_TRSL_ADDR_LSB_OFFSET	0x8
@@ -73,6 +83,9 @@ 
  * @phy: PHY controller block
  * @clks: PCIe clocks
  * @num_clks: PCIe clocks count for this port
+ * @irq: PCIe controller interrupt number
+ * @irq_lock: lock protecting IRQ register access
+ * @intx_domain: legacy INTx IRQ domain
  */
 struct mtk_pcie_port {
 	struct device *dev;
@@ -83,6 +96,10 @@  struct mtk_pcie_port {
 	struct phy *phy;
 	struct clk_bulk_data *clks;
 	int num_clks;
+
+	int irq;
+	raw_spinlock_t irq_lock;
+	struct irq_domain *intx_domain;
 };
 
 /**
@@ -199,6 +216,11 @@  static int mtk_pcie_startup_port(struct mtk_pcie_port *port)
 	val |= PCI_CLASS(PCI_CLASS_BRIDGE_PCI << 8);
 	writel_relaxed(val, port->base + PCIE_PCI_IDS_1);
 
+	/* Mask all INTx interrupts */
+	val = readl_relaxed(port->base + PCIE_INT_ENABLE_REG);
+	val &= ~PCIE_INTX_ENABLE;
+	writel_relaxed(val, port->base + PCIE_INT_ENABLE_REG);
+
 	/* Assert all reset signals */
 	val = readl_relaxed(port->base + PCIE_RST_CTRL_REG);
 	val |= PCIE_MAC_RSTB | PCIE_PHY_RSTB | PCIE_BRG_RSTB | PCIE_PE_RSTB;
@@ -262,6 +284,154 @@  static int mtk_pcie_startup_port(struct mtk_pcie_port *port)
 	return 0;
 }
 
+static int mtk_pcie_set_affinity(struct irq_data *data,
+				 const struct cpumask *mask, bool force)
+{
+	return -EINVAL;
+}
+
+static void mtk_intx_mask(struct irq_data *data)
+{
+	struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
+	unsigned long flags;
+	u32 val;
+
+	raw_spin_lock_irqsave(&port->irq_lock, flags);
+	val = readl_relaxed(port->base + PCIE_INT_ENABLE_REG);
+	val &= ~BIT(data->hwirq + PCIE_INTX_SHIFT);
+	writel_relaxed(val, port->base + PCIE_INT_ENABLE_REG);
+	raw_spin_unlock_irqrestore(&port->irq_lock, flags);
+}
+
+static void mtk_intx_unmask(struct irq_data *data)
+{
+	struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
+	unsigned long flags;
+	u32 val;
+
+	raw_spin_lock_irqsave(&port->irq_lock, flags);
+	val = readl_relaxed(port->base + PCIE_INT_ENABLE_REG);
+	val |= BIT(data->hwirq + PCIE_INTX_SHIFT);
+	writel_relaxed(val, port->base + PCIE_INT_ENABLE_REG);
+	raw_spin_unlock_irqrestore(&port->irq_lock, flags);
+}
+
+/**
+ * mtk_intx_eoi
+ * @data: pointer to chip specific data
+ *
+ * As an emulated level IRQ, its interrupt status will remain
+ * until the corresponding de-assert message is received; hence that
+ * the status can only be cleared when the interrupt has been serviced.
+ */
+static void mtk_intx_eoi(struct irq_data *data)
+{
+	struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
+	unsigned long hwirq;
+
+	hwirq = data->hwirq + PCIE_INTX_SHIFT;
+	writel_relaxed(BIT(hwirq), port->base + PCIE_INT_STATUS_REG);
+}
+
+static struct irq_chip mtk_intx_irq_chip = {
+	.irq_enable		= mtk_intx_unmask,
+	.irq_disable		= mtk_intx_mask,
+	.irq_mask		= mtk_intx_mask,
+	.irq_unmask		= mtk_intx_unmask,
+	.irq_eoi		= mtk_intx_eoi,
+	.irq_set_affinity	= mtk_pcie_set_affinity,
+	.name			= "INTx",
+};
+
+static int mtk_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
+			     irq_hw_number_t hwirq)
+{
+	irq_set_chip_data(irq, domain->host_data);
+	irq_set_chip_and_handler_name(irq, &mtk_intx_irq_chip,
+				      handle_fasteoi_irq, "INTx");
+	return 0;
+}
+
+static const struct irq_domain_ops intx_domain_ops = {
+	.map = mtk_pcie_intx_map,
+};
+
+static int mtk_pcie_init_irq_domains(struct mtk_pcie_port *port)
+{
+	struct device *dev = port->dev;
+	struct device_node *intc_node, *node = dev->of_node;
+
+	raw_spin_lock_init(&port->irq_lock);
+
+	/* Setup INTx */
+	intc_node = of_get_child_by_name(node, "interrupt-controller");
+	if (!intc_node) {
+		dev_err(dev, "missing PCIe Intc node\n");
+		return -ENODEV;
+	}
+
+	port->intx_domain = irq_domain_add_linear(intc_node, PCI_NUM_INTX,
+						  &intx_domain_ops, port);
+	if (!port->intx_domain) {
+		dev_err(dev, "failed to get INTx IRQ domain\n");
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static void mtk_pcie_irq_teardown(struct mtk_pcie_port *port)
+{
+	irq_set_chained_handler_and_data(port->irq, NULL, NULL);
+
+	if (port->intx_domain)
+		irq_domain_remove(port->intx_domain);
+
+	irq_dispose_mapping(port->irq);
+}
+
+static void mtk_pcie_irq_handler(struct irq_desc *desc)
+{
+	struct mtk_pcie_port *port = irq_desc_get_handler_data(desc);
+	struct irq_chip *irqchip = irq_desc_get_chip(desc);
+	unsigned long status;
+	unsigned int virq;
+	irq_hw_number_t irq_bit = PCIE_INTX_SHIFT;
+
+	chained_irq_enter(irqchip, desc);
+
+	status = readl_relaxed(port->base + PCIE_INT_STATUS_REG);
+	for_each_set_bit_from(irq_bit, &status, PCI_NUM_INTX +
+			      PCIE_INTX_SHIFT) {
+		virq = irq_find_mapping(port->intx_domain,
+					irq_bit - PCIE_INTX_SHIFT);
+		generic_handle_irq(virq);
+	}
+
+	chained_irq_exit(irqchip, desc);
+}
+
+static int mtk_pcie_setup_irq(struct mtk_pcie_port *port)
+{
+	struct device *dev = port->dev;
+	struct platform_device *pdev = to_platform_device(dev);
+	int err;
+
+	err = mtk_pcie_init_irq_domains(port);
+	if (err) {
+		dev_err(dev, "failed to init PCIe IRQ domain\n");
+		return err;
+	}
+
+	port->irq = platform_get_irq(pdev, 0);
+	if (port->irq < 0)
+		return port->irq;
+
+	irq_set_chained_handler_and_data(port->irq, mtk_pcie_irq_handler, port);
+
+	return 0;
+}
+
 static int mtk_pcie_clk_init(struct mtk_pcie_port *port)
 {
 	int ret;
@@ -384,6 +554,10 @@  static int mtk_pcie_setup(struct mtk_pcie_port *port)
 		goto err_setup;
 	}
 
+	err = mtk_pcie_setup_irq(port);
+	if (err)
+		goto err_setup;
+
 	return 0;
 
 err_setup:
@@ -417,6 +591,7 @@  static int mtk_pcie_probe(struct platform_device *pdev)
 
 	err = pci_host_probe(host);
 	if (err) {
+		mtk_pcie_irq_teardown(port);
 		mtk_pcie_power_down(port);
 		return err;
 	}
@@ -434,6 +609,7 @@  static int mtk_pcie_remove(struct platform_device *pdev)
 	pci_remove_root_bus(host->bus);
 	pci_unlock_rescan_remove();
 
+	mtk_pcie_irq_teardown(port);
 	mtk_pcie_power_down(port);
 
 	return 0;