diff mbox series

[v4,2/6] PCI: iproc: Add INTx support with better modeling

Message ID 1576814058-30003-3-git-send-email-srinath.mannam@broadcom.com
State New
Headers show
Series PAXB INTx support with proper model | expand

Commit Message

Srinath Mannam Dec. 20, 2019, 3:54 a.m. UTC
From: Ray Jui <ray.jui@broadcom.com>

Add PCIe legacy interrupt INTx support to the iProc PCIe driver by
modeling it with its own IRQ domain. All 4 interrupts INTA, INTB, INTC,
INTD share the same interrupt line connected to the GIC in the system,
while the status of each INTx can be obtained through the INTX CSR
register

Signed-off-by: Ray Jui <ray.jui@broadcom.com>
Signed-off-by: Srinath Mannam <srinath.mannam@broadcom.com>
---
 drivers/pci/controller/pcie-iproc.c | 108 +++++++++++++++++++++++++++++++++++-
 drivers/pci/controller/pcie-iproc.h |   6 ++
 2 files changed, 112 insertions(+), 2 deletions(-)

Comments

Andrew Murray Jan. 6, 2020, 12:38 p.m. UTC | #1
On Fri, Dec 20, 2019 at 09:24:14AM +0530, Srinath Mannam wrote:
> From: Ray Jui <ray.jui@broadcom.com>
> 
> Add PCIe legacy interrupt INTx support to the iProc PCIe driver by
> modeling it with its own IRQ domain. All 4 interrupts INTA, INTB, INTC,
> INTD share the same interrupt line connected to the GIC in the system,
> while the status of each INTx can be obtained through the INTX CSR
> register
> 
> Signed-off-by: Ray Jui <ray.jui@broadcom.com>
> Signed-off-by: Srinath Mannam <srinath.mannam@broadcom.com>

Reviewed-by: Andrew Murray <andrew.murray@arm.com>

> ---
>  drivers/pci/controller/pcie-iproc.c | 108 +++++++++++++++++++++++++++++++++++-
>  drivers/pci/controller/pcie-iproc.h |   6 ++
>  2 files changed, 112 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-iproc.c b/drivers/pci/controller/pcie-iproc.c
> index 0a468c7..485967b 100644
> --- a/drivers/pci/controller/pcie-iproc.c
> +++ b/drivers/pci/controller/pcie-iproc.c
> @@ -14,6 +14,7 @@
>  #include <linux/delay.h>
>  #include <linux/interrupt.h>
>  #include <linux/irqchip/arm-gic-v3.h>
> +#include <linux/irqchip/chained_irq.h>
>  #include <linux/platform_device.h>
>  #include <linux/of_address.h>
>  #include <linux/of_pci.h>
> @@ -270,6 +271,7 @@ enum iproc_pcie_reg {
>  
>  	/* enable INTx */
>  	IPROC_PCIE_INTX_EN,
> +	IPROC_PCIE_INTX_CSR,
>  
>  	/* outbound address mapping */
>  	IPROC_PCIE_OARR0,
> @@ -314,6 +316,7 @@ static const u16 iproc_pcie_reg_paxb_bcma[] = {
>  	[IPROC_PCIE_CFG_ADDR]		= 0x1f8,
>  	[IPROC_PCIE_CFG_DATA]		= 0x1fc,
>  	[IPROC_PCIE_INTX_EN]		= 0x330,
> +	[IPROC_PCIE_INTX_CSR]		= 0x334,
>  	[IPROC_PCIE_LINK_STATUS]	= 0xf0c,
>  };
>  
> @@ -325,6 +328,7 @@ static const u16 iproc_pcie_reg_paxb[] = {
>  	[IPROC_PCIE_CFG_ADDR]		= 0x1f8,
>  	[IPROC_PCIE_CFG_DATA]		= 0x1fc,
>  	[IPROC_PCIE_INTX_EN]		= 0x330,
> +	[IPROC_PCIE_INTX_CSR]		= 0x334,
>  	[IPROC_PCIE_OARR0]		= 0xd20,
>  	[IPROC_PCIE_OMAP0]		= 0xd40,
>  	[IPROC_PCIE_OARR1]		= 0xd28,
> @@ -341,6 +345,7 @@ static const u16 iproc_pcie_reg_paxb_v2[] = {
>  	[IPROC_PCIE_CFG_ADDR]		= 0x1f8,
>  	[IPROC_PCIE_CFG_DATA]		= 0x1fc,
>  	[IPROC_PCIE_INTX_EN]		= 0x330,
> +	[IPROC_PCIE_INTX_CSR]		= 0x334,
>  	[IPROC_PCIE_OARR0]		= 0xd20,
>  	[IPROC_PCIE_OMAP0]		= 0xd40,
>  	[IPROC_PCIE_OARR1]		= 0xd28,
> @@ -846,9 +851,103 @@ static int iproc_pcie_check_link(struct iproc_pcie *pcie)
>  	return link_is_active ? 0 : -ENODEV;
>  }
>  
> -static void iproc_pcie_enable(struct iproc_pcie *pcie)
> +static int iproc_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
> +			       irq_hw_number_t hwirq)
>  {
> +	irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);
> +	irq_set_chip_data(irq, domain->host_data);
> +
> +	return 0;
> +}
> +
> +static const struct irq_domain_ops intx_domain_ops = {
> +	.map = iproc_pcie_intx_map,
> +};
> +
> +static void iproc_pcie_isr(struct irq_desc *desc)
> +{
> +	struct irq_chip *chip = irq_desc_get_chip(desc);
> +	struct iproc_pcie *pcie;
> +	struct device *dev;
> +	unsigned long status;
> +	u32 bit, virq;
> +
> +	chained_irq_enter(chip, desc);
> +	pcie = irq_desc_get_handler_data(desc);
> +	dev = pcie->dev;
> +
> +	/* go through INTx A, B, C, D until all interrupts are handled */
> +	do {
> +		status = iproc_pcie_read_reg(pcie, IPROC_PCIE_INTX_CSR);
> +		for_each_set_bit(bit, &status, PCI_NUM_INTX) {
> +			virq = irq_find_mapping(pcie->irq_domain, bit);
> +			if (virq)
> +				generic_handle_irq(virq);
> +			else
> +				dev_err(dev, "unexpected INTx%u\n", bit);
> +		}
> +	} while ((status & SYS_RC_INTX_MASK) != 0);
> +
> +	chained_irq_exit(chip, desc);
> +}
> +
> +static int iproc_pcie_intx_enable(struct iproc_pcie *pcie)
> +{
> +	struct device *dev = pcie->dev;
> +	struct device_node *node;
> +	int ret;
> +
> +	/*
> +	 * BCMA devices do not map INTx the same way as platform devices. All
> +	 * BCMA needs below line to enable INTx
> +	 */
>  	iproc_pcie_write_reg(pcie, IPROC_PCIE_INTX_EN, SYS_RC_INTX_MASK);
> +
> +	node = of_get_compatible_child(dev->of_node, "brcm,iproc-intc");
> +	if (node)
> +		pcie->irq = of_irq_get(node, 0);
> +
> +	if (!node || pcie->irq <= 0)
> +		return 0;
> +
> +	/* set IRQ handler */
> +	irq_set_chained_handler_and_data(pcie->irq, iproc_pcie_isr, pcie);
> +
> +	/* add IRQ domain for INTx */
> +	pcie->irq_domain = irq_domain_add_linear(node, PCI_NUM_INTX,
> +						 &intx_domain_ops, pcie);
> +	if (!pcie->irq_domain) {
> +		dev_err(dev, "failed to add INTx IRQ domain\n");
> +		ret = -ENOMEM;
> +		goto err_rm_handler_data;
> +	}
> +
> +	return 0;
> +
> +err_rm_handler_data:
> +	of_node_put(node);
> +	irq_set_chained_handler_and_data(pcie->irq, NULL, NULL);
> +
> +	return ret;
> +}
> +
> +static void iproc_pcie_intx_disable(struct iproc_pcie *pcie)
> +{
> +	uint32_t offset, virq;
> +
> +	iproc_pcie_write_reg(pcie, IPROC_PCIE_INTX_EN, 0x0);
> +
> +	if (pcie->irq <= 0)
> +		return;
> +
> +	for (offset = 0; offset < PCI_NUM_INTX; offset++) {
> +		virq = irq_find_mapping(pcie->irq_domain, offset);
> +		if (virq)
> +			irq_dispose_mapping(virq);
> +	}
> +
> +	irq_domain_remove(pcie->irq_domain);
> +	irq_set_chained_handler_and_data(pcie->irq, NULL, NULL);
>  }
>  
>  static inline bool iproc_pcie_ob_is_valid(struct iproc_pcie *pcie,
> @@ -1518,7 +1617,11 @@ int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
>  		goto err_power_off_phy;
>  	}
>  
> -	iproc_pcie_enable(pcie);
> +	ret = iproc_pcie_intx_enable(pcie);
> +	if (ret) {
> +		dev_err(dev, "failed to enable INTx\n");
> +		goto err_power_off_phy;
> +	}
>  
>  	if (IS_ENABLED(CONFIG_PCI_MSI))
>  		if (iproc_pcie_msi_enable(pcie))
> @@ -1562,6 +1665,7 @@ int iproc_pcie_remove(struct iproc_pcie *pcie)
>  	pci_remove_root_bus(pcie->root_bus);
>  
>  	iproc_pcie_msi_disable(pcie);
> +	iproc_pcie_intx_disable(pcie);
>  
>  	phy_power_off(pcie->phy);
>  	phy_exit(pcie->phy);
> diff --git a/drivers/pci/controller/pcie-iproc.h b/drivers/pci/controller/pcie-iproc.h
> index 4f03ea5..103e568 100644
> --- a/drivers/pci/controller/pcie-iproc.h
> +++ b/drivers/pci/controller/pcie-iproc.h
> @@ -74,6 +74,9 @@ struct iproc_msi;
>   * @ib: inbound mapping related parameters
>   * @ib_map: outbound mapping region related parameters
>   *
> + * @irq: interrupt line wired to the generic GIC for INTx
> + * @irq_domain: IRQ domain for INTx
> + *
>   * @need_msi_steer: indicates additional configuration of the iProc PCIe
>   * controller is required to steer MSI writes to external interrupt controller
>   * @msi: MSI data
> @@ -102,6 +105,9 @@ struct iproc_pcie {
>  	struct iproc_pcie_ib ib;
>  	const struct iproc_pcie_ib_map *ib_map;
>  
> +	int irq;
> +	struct irq_domain *irq_domain;
> +
>  	bool need_msi_steer;
>  	struct iproc_msi *msi;
>  };
> -- 
> 2.7.4
>
Lorenzo Pieralisi Jan. 14, 2020, 3:37 p.m. UTC | #2
[+Marc thanks to whom I can review this code with the required IRQ chip
knowledge]

On Fri, Dec 20, 2019 at 09:24:14AM +0530, Srinath Mannam wrote:
> From: Ray Jui <ray.jui@broadcom.com>
> 
> Add PCIe legacy interrupt INTx support to the iProc PCIe driver by
> modeling it with its own IRQ domain. All 4 interrupts INTA, INTB, INTC,
> INTD share the same interrupt line connected to the GIC in the system,
> while the status of each INTx can be obtained through the INTX CSR
> register
          ^
Missing a period.

> Signed-off-by: Ray Jui <ray.jui@broadcom.com>
> Signed-off-by: Srinath Mannam <srinath.mannam@broadcom.com>
> ---
>  drivers/pci/controller/pcie-iproc.c | 108 +++++++++++++++++++++++++++++++++++-
>  drivers/pci/controller/pcie-iproc.h |   6 ++
>  2 files changed, 112 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-iproc.c b/drivers/pci/controller/pcie-iproc.c
> index 0a468c7..485967b 100644
> --- a/drivers/pci/controller/pcie-iproc.c
> +++ b/drivers/pci/controller/pcie-iproc.c
> @@ -14,6 +14,7 @@
>  #include <linux/delay.h>
>  #include <linux/interrupt.h>
>  #include <linux/irqchip/arm-gic-v3.h>
> +#include <linux/irqchip/chained_irq.h>
>  #include <linux/platform_device.h>
>  #include <linux/of_address.h>
>  #include <linux/of_pci.h>
> @@ -270,6 +271,7 @@ enum iproc_pcie_reg {
>  
>  	/* enable INTx */
>  	IPROC_PCIE_INTX_EN,
> +	IPROC_PCIE_INTX_CSR,
>  
>  	/* outbound address mapping */
>  	IPROC_PCIE_OARR0,
> @@ -314,6 +316,7 @@ static const u16 iproc_pcie_reg_paxb_bcma[] = {
>  	[IPROC_PCIE_CFG_ADDR]		= 0x1f8,
>  	[IPROC_PCIE_CFG_DATA]		= 0x1fc,
>  	[IPROC_PCIE_INTX_EN]		= 0x330,
> +	[IPROC_PCIE_INTX_CSR]		= 0x334,
>  	[IPROC_PCIE_LINK_STATUS]	= 0xf0c,
>  };
>  
> @@ -325,6 +328,7 @@ static const u16 iproc_pcie_reg_paxb[] = {
>  	[IPROC_PCIE_CFG_ADDR]		= 0x1f8,
>  	[IPROC_PCIE_CFG_DATA]		= 0x1fc,
>  	[IPROC_PCIE_INTX_EN]		= 0x330,
> +	[IPROC_PCIE_INTX_CSR]		= 0x334,
>  	[IPROC_PCIE_OARR0]		= 0xd20,
>  	[IPROC_PCIE_OMAP0]		= 0xd40,
>  	[IPROC_PCIE_OARR1]		= 0xd28,
> @@ -341,6 +345,7 @@ static const u16 iproc_pcie_reg_paxb_v2[] = {
>  	[IPROC_PCIE_CFG_ADDR]		= 0x1f8,
>  	[IPROC_PCIE_CFG_DATA]		= 0x1fc,
>  	[IPROC_PCIE_INTX_EN]		= 0x330,
> +	[IPROC_PCIE_INTX_CSR]		= 0x334,
>  	[IPROC_PCIE_OARR0]		= 0xd20,
>  	[IPROC_PCIE_OMAP0]		= 0xd40,
>  	[IPROC_PCIE_OARR1]		= 0xd28,
> @@ -846,9 +851,103 @@ static int iproc_pcie_check_link(struct iproc_pcie *pcie)
>  	return link_is_active ? 0 : -ENODEV;
>  }
>  
> -static void iproc_pcie_enable(struct iproc_pcie *pcie)
> +static int iproc_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
> +			       irq_hw_number_t hwirq)
>  {
> +	irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);

This looks wrong.

Don't tell me there are other PCI controllers drivers implementing this
code so you copied and pasted it; I know that and they are all wrong.

Legacy PCI IRQs are level IRQs so they must be masked/unmasked upon IRQ
entry/exit.

Therefore the IRQ chip representing your controller can't be a
dummy_irq_chip, that has no methods so no masking is implemented
through it and the flow handler must be handle_level_irq (which,
in turn takes care of masking the IRQ - handle_simple_irq does
not).

The IRQ chip in the PCI host bridge has to have a way to mask/unmask
specific IRQs, implement a proper IRQ chip for it please.

We are curious: Have you ever tested this change with a PCI driver
requesting a threaded IRQ ?

Thanks,
Lorenzo

> +	irq_set_chip_data(irq, domain->host_data);
> +
> +	return 0;
> +}
> +
> +static const struct irq_domain_ops intx_domain_ops = {
> +	.map = iproc_pcie_intx_map,
> +};
> +
> +static void iproc_pcie_isr(struct irq_desc *desc)
> +{
> +	struct irq_chip *chip = irq_desc_get_chip(desc);
> +	struct iproc_pcie *pcie;
> +	struct device *dev;
> +	unsigned long status;
> +	u32 bit, virq;
> +
> +	chained_irq_enter(chip, desc);
> +	pcie = irq_desc_get_handler_data(desc);
> +	dev = pcie->dev;
> +
> +	/* go through INTx A, B, C, D until all interrupts are handled */
> +	do {
> +		status = iproc_pcie_read_reg(pcie, IPROC_PCIE_INTX_CSR);
> +		for_each_set_bit(bit, &status, PCI_NUM_INTX) {
> +			virq = irq_find_mapping(pcie->irq_domain, bit);
> +			if (virq)
> +				generic_handle_irq(virq);
> +			else
> +				dev_err(dev, "unexpected INTx%u\n", bit);
> +		}
> +	} while ((status & SYS_RC_INTX_MASK) != 0);
> +
> +	chained_irq_exit(chip, desc);
> +}
> +
> +static int iproc_pcie_intx_enable(struct iproc_pcie *pcie)
> +{
> +	struct device *dev = pcie->dev;
> +	struct device_node *node;
> +	int ret;
> +
> +	/*
> +	 * BCMA devices do not map INTx the same way as platform devices. All
> +	 * BCMA needs below line to enable INTx
> +	 */
>  	iproc_pcie_write_reg(pcie, IPROC_PCIE_INTX_EN, SYS_RC_INTX_MASK);
> +
> +	node = of_get_compatible_child(dev->of_node, "brcm,iproc-intc");
> +	if (node)
> +		pcie->irq = of_irq_get(node, 0);
> +
> +	if (!node || pcie->irq <= 0)
> +		return 0;
> +
> +	/* set IRQ handler */
> +	irq_set_chained_handler_and_data(pcie->irq, iproc_pcie_isr, pcie);
> +
> +	/* add IRQ domain for INTx */
> +	pcie->irq_domain = irq_domain_add_linear(node, PCI_NUM_INTX,
> +						 &intx_domain_ops, pcie);
> +	if (!pcie->irq_domain) {
> +		dev_err(dev, "failed to add INTx IRQ domain\n");
> +		ret = -ENOMEM;
> +		goto err_rm_handler_data;
> +	}
> +
> +	return 0;
> +
> +err_rm_handler_data:
> +	of_node_put(node);
> +	irq_set_chained_handler_and_data(pcie->irq, NULL, NULL);
> +
> +	return ret;
> +}
> +
> +static void iproc_pcie_intx_disable(struct iproc_pcie *pcie)
> +{
> +	uint32_t offset, virq;
> +
> +	iproc_pcie_write_reg(pcie, IPROC_PCIE_INTX_EN, 0x0);
> +
> +	if (pcie->irq <= 0)
> +		return;
> +
> +	for (offset = 0; offset < PCI_NUM_INTX; offset++) {
> +		virq = irq_find_mapping(pcie->irq_domain, offset);
> +		if (virq)
> +			irq_dispose_mapping(virq);
> +	}
> +
> +	irq_domain_remove(pcie->irq_domain);
> +	irq_set_chained_handler_and_data(pcie->irq, NULL, NULL);
>  }
>  
>  static inline bool iproc_pcie_ob_is_valid(struct iproc_pcie *pcie,
> @@ -1518,7 +1617,11 @@ int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
>  		goto err_power_off_phy;
>  	}
>  
> -	iproc_pcie_enable(pcie);
> +	ret = iproc_pcie_intx_enable(pcie);
> +	if (ret) {
> +		dev_err(dev, "failed to enable INTx\n");
> +		goto err_power_off_phy;
> +	}
>  
>  	if (IS_ENABLED(CONFIG_PCI_MSI))
>  		if (iproc_pcie_msi_enable(pcie))
> @@ -1562,6 +1665,7 @@ int iproc_pcie_remove(struct iproc_pcie *pcie)
>  	pci_remove_root_bus(pcie->root_bus);
>  
>  	iproc_pcie_msi_disable(pcie);
> +	iproc_pcie_intx_disable(pcie);
>  
>  	phy_power_off(pcie->phy);
>  	phy_exit(pcie->phy);
> diff --git a/drivers/pci/controller/pcie-iproc.h b/drivers/pci/controller/pcie-iproc.h
> index 4f03ea5..103e568 100644
> --- a/drivers/pci/controller/pcie-iproc.h
> +++ b/drivers/pci/controller/pcie-iproc.h
> @@ -74,6 +74,9 @@ struct iproc_msi;
>   * @ib: inbound mapping related parameters
>   * @ib_map: outbound mapping region related parameters
>   *
> + * @irq: interrupt line wired to the generic GIC for INTx
> + * @irq_domain: IRQ domain for INTx
> + *
>   * @need_msi_steer: indicates additional configuration of the iProc PCIe
>   * controller is required to steer MSI writes to external interrupt controller
>   * @msi: MSI data
> @@ -102,6 +105,9 @@ struct iproc_pcie {
>  	struct iproc_pcie_ib ib;
>  	const struct iproc_pcie_ib_map *ib_map;
>  
> +	int irq;
> +	struct irq_domain *irq_domain;
> +
>  	bool need_msi_steer;
>  	struct iproc_msi *msi;
>  };
> -- 
> 2.7.4
>
diff mbox series

Patch

diff --git a/drivers/pci/controller/pcie-iproc.c b/drivers/pci/controller/pcie-iproc.c
index 0a468c7..485967b 100644
--- a/drivers/pci/controller/pcie-iproc.c
+++ b/drivers/pci/controller/pcie-iproc.c
@@ -14,6 +14,7 @@ 
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/irqchip/arm-gic-v3.h>
+#include <linux/irqchip/chained_irq.h>
 #include <linux/platform_device.h>
 #include <linux/of_address.h>
 #include <linux/of_pci.h>
@@ -270,6 +271,7 @@  enum iproc_pcie_reg {
 
 	/* enable INTx */
 	IPROC_PCIE_INTX_EN,
+	IPROC_PCIE_INTX_CSR,
 
 	/* outbound address mapping */
 	IPROC_PCIE_OARR0,
@@ -314,6 +316,7 @@  static const u16 iproc_pcie_reg_paxb_bcma[] = {
 	[IPROC_PCIE_CFG_ADDR]		= 0x1f8,
 	[IPROC_PCIE_CFG_DATA]		= 0x1fc,
 	[IPROC_PCIE_INTX_EN]		= 0x330,
+	[IPROC_PCIE_INTX_CSR]		= 0x334,
 	[IPROC_PCIE_LINK_STATUS]	= 0xf0c,
 };
 
@@ -325,6 +328,7 @@  static const u16 iproc_pcie_reg_paxb[] = {
 	[IPROC_PCIE_CFG_ADDR]		= 0x1f8,
 	[IPROC_PCIE_CFG_DATA]		= 0x1fc,
 	[IPROC_PCIE_INTX_EN]		= 0x330,
+	[IPROC_PCIE_INTX_CSR]		= 0x334,
 	[IPROC_PCIE_OARR0]		= 0xd20,
 	[IPROC_PCIE_OMAP0]		= 0xd40,
 	[IPROC_PCIE_OARR1]		= 0xd28,
@@ -341,6 +345,7 @@  static const u16 iproc_pcie_reg_paxb_v2[] = {
 	[IPROC_PCIE_CFG_ADDR]		= 0x1f8,
 	[IPROC_PCIE_CFG_DATA]		= 0x1fc,
 	[IPROC_PCIE_INTX_EN]		= 0x330,
+	[IPROC_PCIE_INTX_CSR]		= 0x334,
 	[IPROC_PCIE_OARR0]		= 0xd20,
 	[IPROC_PCIE_OMAP0]		= 0xd40,
 	[IPROC_PCIE_OARR1]		= 0xd28,
@@ -846,9 +851,103 @@  static int iproc_pcie_check_link(struct iproc_pcie *pcie)
 	return link_is_active ? 0 : -ENODEV;
 }
 
-static void iproc_pcie_enable(struct iproc_pcie *pcie)
+static int iproc_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
+			       irq_hw_number_t hwirq)
 {
+	irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);
+	irq_set_chip_data(irq, domain->host_data);
+
+	return 0;
+}
+
+static const struct irq_domain_ops intx_domain_ops = {
+	.map = iproc_pcie_intx_map,
+};
+
+static void iproc_pcie_isr(struct irq_desc *desc)
+{
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	struct iproc_pcie *pcie;
+	struct device *dev;
+	unsigned long status;
+	u32 bit, virq;
+
+	chained_irq_enter(chip, desc);
+	pcie = irq_desc_get_handler_data(desc);
+	dev = pcie->dev;
+
+	/* go through INTx A, B, C, D until all interrupts are handled */
+	do {
+		status = iproc_pcie_read_reg(pcie, IPROC_PCIE_INTX_CSR);
+		for_each_set_bit(bit, &status, PCI_NUM_INTX) {
+			virq = irq_find_mapping(pcie->irq_domain, bit);
+			if (virq)
+				generic_handle_irq(virq);
+			else
+				dev_err(dev, "unexpected INTx%u\n", bit);
+		}
+	} while ((status & SYS_RC_INTX_MASK) != 0);
+
+	chained_irq_exit(chip, desc);
+}
+
+static int iproc_pcie_intx_enable(struct iproc_pcie *pcie)
+{
+	struct device *dev = pcie->dev;
+	struct device_node *node;
+	int ret;
+
+	/*
+	 * BCMA devices do not map INTx the same way as platform devices. All
+	 * BCMA needs below line to enable INTx
+	 */
 	iproc_pcie_write_reg(pcie, IPROC_PCIE_INTX_EN, SYS_RC_INTX_MASK);
+
+	node = of_get_compatible_child(dev->of_node, "brcm,iproc-intc");
+	if (node)
+		pcie->irq = of_irq_get(node, 0);
+
+	if (!node || pcie->irq <= 0)
+		return 0;
+
+	/* set IRQ handler */
+	irq_set_chained_handler_and_data(pcie->irq, iproc_pcie_isr, pcie);
+
+	/* add IRQ domain for INTx */
+	pcie->irq_domain = irq_domain_add_linear(node, PCI_NUM_INTX,
+						 &intx_domain_ops, pcie);
+	if (!pcie->irq_domain) {
+		dev_err(dev, "failed to add INTx IRQ domain\n");
+		ret = -ENOMEM;
+		goto err_rm_handler_data;
+	}
+
+	return 0;
+
+err_rm_handler_data:
+	of_node_put(node);
+	irq_set_chained_handler_and_data(pcie->irq, NULL, NULL);
+
+	return ret;
+}
+
+static void iproc_pcie_intx_disable(struct iproc_pcie *pcie)
+{
+	uint32_t offset, virq;
+
+	iproc_pcie_write_reg(pcie, IPROC_PCIE_INTX_EN, 0x0);
+
+	if (pcie->irq <= 0)
+		return;
+
+	for (offset = 0; offset < PCI_NUM_INTX; offset++) {
+		virq = irq_find_mapping(pcie->irq_domain, offset);
+		if (virq)
+			irq_dispose_mapping(virq);
+	}
+
+	irq_domain_remove(pcie->irq_domain);
+	irq_set_chained_handler_and_data(pcie->irq, NULL, NULL);
 }
 
 static inline bool iproc_pcie_ob_is_valid(struct iproc_pcie *pcie,
@@ -1518,7 +1617,11 @@  int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
 		goto err_power_off_phy;
 	}
 
-	iproc_pcie_enable(pcie);
+	ret = iproc_pcie_intx_enable(pcie);
+	if (ret) {
+		dev_err(dev, "failed to enable INTx\n");
+		goto err_power_off_phy;
+	}
 
 	if (IS_ENABLED(CONFIG_PCI_MSI))
 		if (iproc_pcie_msi_enable(pcie))
@@ -1562,6 +1665,7 @@  int iproc_pcie_remove(struct iproc_pcie *pcie)
 	pci_remove_root_bus(pcie->root_bus);
 
 	iproc_pcie_msi_disable(pcie);
+	iproc_pcie_intx_disable(pcie);
 
 	phy_power_off(pcie->phy);
 	phy_exit(pcie->phy);
diff --git a/drivers/pci/controller/pcie-iproc.h b/drivers/pci/controller/pcie-iproc.h
index 4f03ea5..103e568 100644
--- a/drivers/pci/controller/pcie-iproc.h
+++ b/drivers/pci/controller/pcie-iproc.h
@@ -74,6 +74,9 @@  struct iproc_msi;
  * @ib: inbound mapping related parameters
  * @ib_map: outbound mapping region related parameters
  *
+ * @irq: interrupt line wired to the generic GIC for INTx
+ * @irq_domain: IRQ domain for INTx
+ *
  * @need_msi_steer: indicates additional configuration of the iProc PCIe
  * controller is required to steer MSI writes to external interrupt controller
  * @msi: MSI data
@@ -102,6 +105,9 @@  struct iproc_pcie {
 	struct iproc_pcie_ib ib;
 	const struct iproc_pcie_ib_map *ib_map;
 
+	int irq;
+	struct irq_domain *irq_domain;
+
 	bool need_msi_steer;
 	struct iproc_msi *msi;
 };