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[2/2] PCI: sophgo-dwc: Add Sophgo SG2044 PCIe driver

Message ID 20250221013758.370936-3-inochiama@gmail.com (mailing list archive)
State New
Headers show
Series riscv: sophgo Add PCIe support to Sophgo SG2044 SoC | expand

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Commit Message

Inochi Amaoto Feb. 21, 2025, 1:37 a.m. UTC 
Add support for DesignWare-based PCIe controller in SG2044 SoC.

Signed-off-by: Inochi Amaoto <inochiama@gmail.com>
---
 drivers/pci/controller/dwc/Kconfig          |  10 +
 drivers/pci/controller/dwc/Makefile         |   1 +
 drivers/pci/controller/dwc/pcie-dw-sophgo.c | 282 ++++++++++++++++++++
 3 files changed, 293 insertions(+)
 create mode 100644 drivers/pci/controller/dwc/pcie-dw-sophgo.c

Comments

Philipp Zabel Feb. 21, 2025, 9:07 a.m. UTC | #1 
On Fr, 2025-02-21 at 09:37 +0800, Inochi Amaoto wrote:
> Add support for DesignWare-based PCIe controller in SG2044 SoC.
> 
> Signed-off-by: Inochi Amaoto <inochiama@gmail.com>
> ---
>  drivers/pci/controller/dwc/Kconfig          |  10 +
>  drivers/pci/controller/dwc/Makefile         |   1 +
>  drivers/pci/controller/dwc/pcie-dw-sophgo.c | 282 ++++++++++++++++++++
>  3 files changed, 293 insertions(+)
>  create mode 100644 drivers/pci/controller/dwc/pcie-dw-sophgo.c
> 
[...]
> diff --git a/drivers/pci/controller/dwc/pcie-dw-sophgo.c b/drivers/pci/controller/dwc/pcie-dw-sophgo.c
> new file mode 100644
> index 000000000000..a4ca4f1e26e0
> --- /dev/null
> +++ b/drivers/pci/controller/dwc/pcie-dw-sophgo.c
> @@ -0,0 +1,282 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * PCIe host controller driver for Sophgo SoCs.
> + *
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/irqchip/chained_irq.h>
> +#include <linux/irqdomain.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/module.h>
> +#include <linux/phy/phy.h>
> +#include <linux/property.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/reset.h>

Drop this ...

> +
> +#include "pcie-designware.h"
> +
> +#define to_sophgo_pcie(x)		dev_get_drvdata((x)->dev)
> +
> +#define PCIE_INT_SIGNAL			0xc48
> +#define PCIE_INT_EN			0xca0
> +
> +#define PCIE_SIGNAL_INTX_SHIFT		5
> +
> +#define PCIE_INT_EN_INTX_SHIFT		1
> +#define PCIE_INT_EN_INT_SII		BIT(0)
> +#define PCIE_INT_EN_INT_INTA		BIT(1)
> +#define PCIE_INT_EN_INT_INTB		BIT(2)
> +#define PCIE_INT_EN_INT_INTC		BIT(3)
> +#define PCIE_INT_EN_INT_INTD		BIT(4)
> +#define PCIE_INT_EN_INT_MSI		BIT(5)
> +
> +struct sophgo_pcie {
> +	struct dw_pcie pci;
> +	void __iomem *app_base;
> +	struct clk_bulk_data *clks;
> +	unsigned int clk_cnt;
> +	struct reset_control *rst;

... and this. It is unused.


regards
Philipp
Bjorn Helgaas Feb. 21, 2025, 11:49 p.m. UTC | #2 
On Fri, Feb 21, 2025 at 09:37:56AM +0800, Inochi Amaoto wrote:
> Add support for DesignWare-based PCIe controller in SG2044 SoC.

> @@ -341,6 +341,16 @@ config PCIE_ROCKCHIP_DW_EP
>  	  Enables support for the DesignWare PCIe controller in the
>  	  Rockchip SoC (except RK3399) to work in endpoint mode.
>  
> +config PCIE_SOPHGO_DW
> +	bool "SOPHGO DesignWare PCIe controller"

What's the canonical styling of "SOPHGO"?  I see "Sophgo" in the
subject line and in Chen Wang's SG2042 series.  Pick the official
styling and use it consistently.

Reorder this so the menuconfig menu items remain alphabetically
sorted.

> +	depends on ARCH_SOPHGO || COMPILE_TEST
> +	depends on PCI_MSI
> +	depends on OF
> +	select PCIE_DW_HOST
> +	help
> +	  Enables support for the DesignWare PCIe controller in the
> +	  SOPHGO SoC.
> +
>  config PCI_EXYNOS
>  	tristate "Samsung Exynos PCIe controller"
>  	depends on ARCH_EXYNOS || COMPILE_TEST

> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * PCIe host controller driver for Sophgo SoCs.

Looks too generic, since Chen Wang's series says Sophgo SG2042 SoC is
Cadence-based, so this driver apparently doesn't cover all Sophgo
SoCs.

> + *

Spurious blank line.

> + */
> +
> +#include <linux/clk.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/irqchip/chained_irq.h>
> +#include <linux/irqdomain.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/module.h>
> +#include <linux/phy/phy.h>
> +#include <linux/property.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/reset.h>
> +
> +#include "pcie-designware.h"
> +
> +#define to_sophgo_pcie(x)		dev_get_drvdata((x)->dev)
> +
> +#define PCIE_INT_SIGNAL			0xc48
> +#define PCIE_INT_EN			0xca0
> +
> +#define PCIE_SIGNAL_INTX_SHIFT		5
> +#define PCIE_INT_EN_INTX_SHIFT		1

Define masks with GENMASK() and get rid of the _SHIFT #defines.

> +#define PCIE_INT_EN_INT_SII		BIT(0)
> +#define PCIE_INT_EN_INT_INTA		BIT(1)
> +#define PCIE_INT_EN_INT_INTB		BIT(2)
> +#define PCIE_INT_EN_INT_INTC		BIT(3)
> +#define PCIE_INT_EN_INT_INTD		BIT(4)

These are unused, drop them.

> +#define PCIE_INT_EN_INT_MSI		BIT(5)
> +
> +struct sophgo_pcie {
> +	struct dw_pcie pci;
> +	void __iomem *app_base;
> +	struct clk_bulk_data *clks;
> +	unsigned int clk_cnt;
> +	struct reset_control *rst;
> +	struct irq_domain *irq_domain;

Indent the member names to align vertically as most other drivers do.

> +};
> +
> +static int sophgo_pcie_readl_app(struct sophgo_pcie *sophgo, u32 reg)
> +{
> +	return readl_relaxed(sophgo->app_base + reg);
> +}
> +
> +static void sophgo_pcie_writel_app(struct sophgo_pcie *sophgo, u32 val, u32 reg)
> +{
> +	writel_relaxed(val, sophgo->app_base + reg);
> +}
> +
> +static void sophgo_pcie_intx_handler(struct irq_desc *desc)
> +{
> +	struct dw_pcie_rp *pp = irq_desc_get_handler_data(desc);
> +	struct irq_chip *chip = irq_desc_get_chip(desc);
> +	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> +	struct sophgo_pcie *sophgo = to_sophgo_pcie(pci);
> +	unsigned long hwirq = PCIE_SIGNAL_INTX_SHIFT;
> +	unsigned long reg;
> +
> +	chained_irq_enter(chip, desc);
> +
> +	reg = sophgo_pcie_readl_app(sophgo, PCIE_INT_SIGNAL);
> +
> +	for_each_set_bit_from(hwirq, &reg, PCI_NUM_INTX + PCIE_SIGNAL_INTX_SHIFT)

Use FIELD_GET() here and iterate through PCI_NUM_INTX.  Then you don't
need for_each_set_bit_from() and shouldn't need PCIE_SIGNAL_INTX_SHIFT
here and below.

> +		generic_handle_domain_irq(sophgo->irq_domain,
> +					  hwirq - PCIE_SIGNAL_INTX_SHIFT);
> +
> +	chained_irq_exit(chip, desc);
> +}
> +
> +static void sophgo_intx_mask(struct irq_data *d)
> +{
> +	struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d);
> +	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> +	struct sophgo_pcie *sophgo = to_sophgo_pcie(pci);
> +	unsigned long flags;
> +	u32 val;
> +
> +	raw_spin_lock_irqsave(&pp->lock, flags);
> +
> +	val = sophgo_pcie_readl_app(sophgo, PCIE_INT_EN);
> +	val &= ~BIT(d->hwirq + PCIE_INT_EN_INTX_SHIFT);

FIELD_PREP().

> +	sophgo_pcie_writel_app(sophgo, val, PCIE_INT_EN);
> +
> +	raw_spin_unlock_irqrestore(&pp->lock, flags);
> +};
> +
> +static void sophgo_intx_unmask(struct irq_data *d)
> +{
> +	struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d);
> +	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> +	struct sophgo_pcie *sophgo = to_sophgo_pcie(pci);
> +	unsigned long flags;
> +	u32 val;
> +
> +	raw_spin_lock_irqsave(&pp->lock, flags);
> +
> +	val = sophgo_pcie_readl_app(sophgo, PCIE_INT_EN);
> +	val |= BIT(d->hwirq + PCIE_INT_EN_INTX_SHIFT);

Ditto.

> +	sophgo_pcie_writel_app(sophgo, val, PCIE_INT_EN);
> +
> +	raw_spin_unlock_irqrestore(&pp->lock, flags);
> +};
> +
> +static void sophgo_intx_eoi(struct irq_data *d)
> +{
> +}
> +
> +static struct irq_chip sophgo_intx_irq_chip = {
> +	.name			= "INTx",
> +	.irq_mask		= sophgo_intx_mask,
> +	.irq_unmask		= sophgo_intx_unmask,
> +	.irq_eoi		= sophgo_intx_eoi,

Name these ending with the irq_chip field names, e.g.,
sophgo_intx_irq_mask(), to make them easier to find with grep.

Bjorn
Inochi Amaoto Feb. 22, 2025, 12:30 a.m. UTC | #3 
On Fri, Feb 21, 2025 at 10:07:54AM +0100, Philipp Zabel wrote:
> On Fr, 2025-02-21 at 09:37 +0800, Inochi Amaoto wrote:
> > Add support for DesignWare-based PCIe controller in SG2044 SoC.
> > 
> > Signed-off-by: Inochi Amaoto <inochiama@gmail.com>
> > ---
> >  drivers/pci/controller/dwc/Kconfig          |  10 +
> >  drivers/pci/controller/dwc/Makefile         |   1 +
> >  drivers/pci/controller/dwc/pcie-dw-sophgo.c | 282 ++++++++++++++++++++
> >  3 files changed, 293 insertions(+)
> >  create mode 100644 drivers/pci/controller/dwc/pcie-dw-sophgo.c
> > 
> [...]
> > diff --git a/drivers/pci/controller/dwc/pcie-dw-sophgo.c b/drivers/pci/controller/dwc/pcie-dw-sophgo.c
> > new file mode 100644
> > index 000000000000..a4ca4f1e26e0
> > --- /dev/null
> > +++ b/drivers/pci/controller/dwc/pcie-dw-sophgo.c
> > @@ -0,0 +1,282 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * PCIe host controller driver for Sophgo SoCs.
> > + *
> > + */
> > +
> > +#include <linux/clk.h>
> > +#include <linux/gpio/consumer.h>
> > +#include <linux/irqchip/chained_irq.h>
> > +#include <linux/irqdomain.h>
> > +#include <linux/mfd/syscon.h>
> > +#include <linux/module.h>
> > +#include <linux/phy/phy.h>
> > +#include <linux/property.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/regmap.h>
> > +#include <linux/reset.h>
> 
> Drop this ...
> 
> > +
> > +#include "pcie-designware.h"
> > +
> > +#define to_sophgo_pcie(x)		dev_get_drvdata((x)->dev)
> > +
> > +#define PCIE_INT_SIGNAL			0xc48
> > +#define PCIE_INT_EN			0xca0
> > +
> > +#define PCIE_SIGNAL_INTX_SHIFT		5
> > +
> > +#define PCIE_INT_EN_INTX_SHIFT		1
> > +#define PCIE_INT_EN_INT_SII		BIT(0)
> > +#define PCIE_INT_EN_INT_INTA		BIT(1)
> > +#define PCIE_INT_EN_INT_INTB		BIT(2)
> > +#define PCIE_INT_EN_INT_INTC		BIT(3)
> > +#define PCIE_INT_EN_INT_INTD		BIT(4)
> > +#define PCIE_INT_EN_INT_MSI		BIT(5)
> > +
> > +struct sophgo_pcie {
> > +	struct dw_pcie pci;
> > +	void __iomem *app_base;
> > +	struct clk_bulk_data *clks;
> > +	unsigned int clk_cnt;
> > +	struct reset_control *rst;
> 
> ... and this. It is unused.
> 
> 
> regards
> Philipp

Thanks, I will remove this.

Regards,
Inochi
Inochi Amaoto Feb. 22, 2025, 12:43 a.m. UTC | #4 
On Fri, Feb 21, 2025 at 05:49:58PM -0600, Bjorn Helgaas wrote:
> On Fri, Feb 21, 2025 at 09:37:56AM +0800, Inochi Amaoto wrote:
> > Add support for DesignWare-based PCIe controller in SG2044 SoC.
> 
> > @@ -341,6 +341,16 @@ config PCIE_ROCKCHIP_DW_EP
> >  	  Enables support for the DesignWare PCIe controller in the
> >  	  Rockchip SoC (except RK3399) to work in endpoint mode.
> >  
> > +config PCIE_SOPHGO_DW
> > +	bool "SOPHGO DesignWare PCIe controller"
> 
> What's the canonical styling of "SOPHGO"?  I see "Sophgo" in the
> subject line and in Chen Wang's SG2042 series.  Pick the official
> styling and use it consistently.
> 

This is my mistake. It should be "Sophgo", I will change it.

> Reorder this so the menuconfig menu items remain alphabetically
> sorted.
> 

I think this order is applied to the entry title in menuconfig,
and is not the config key? If so, I will change it.

> > +	depends on ARCH_SOPHGO || COMPILE_TEST
> > +	depends on PCI_MSI
> > +	depends on OF
> > +	select PCIE_DW_HOST
> > +	help
> > +	  Enables support for the DesignWare PCIe controller in the
> > +	  SOPHGO SoC.
> > +
> >  config PCI_EXYNOS
> >  	tristate "Samsung Exynos PCIe controller"
> >  	depends on ARCH_EXYNOS || COMPILE_TEST
> 
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * PCIe host controller driver for Sophgo SoCs.
> 
> Looks too generic, since Chen Wang's series says Sophgo SG2042 SoC is
> Cadence-based, so this driver apparently doesn't cover all Sophgo
> SoCs.
> 

OK, I will change the description to point it only cover
the controller based on the DesignWare core.

> > + *
> 
> Spurious blank line.
> 
> > + */
> > +
> > +#include <linux/clk.h>
> > +#include <linux/gpio/consumer.h>
> > +#include <linux/irqchip/chained_irq.h>
> > +#include <linux/irqdomain.h>
> > +#include <linux/mfd/syscon.h>
> > +#include <linux/module.h>
> > +#include <linux/phy/phy.h>
> > +#include <linux/property.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/regmap.h>
> > +#include <linux/reset.h>
> > +
> > +#include "pcie-designware.h"
> > +
> > +#define to_sophgo_pcie(x)		dev_get_drvdata((x)->dev)
> > +
> > +#define PCIE_INT_SIGNAL			0xc48
> > +#define PCIE_INT_EN			0xca0
> > +
> > +#define PCIE_SIGNAL_INTX_SHIFT		5
> > +#define PCIE_INT_EN_INTX_SHIFT		1
> 
> Define masks with GENMASK() and get rid of the _SHIFT #defines.
> 
> > +#define PCIE_INT_EN_INT_SII		BIT(0)
> > +#define PCIE_INT_EN_INT_INTA		BIT(1)
> > +#define PCIE_INT_EN_INT_INTB		BIT(2)
> > +#define PCIE_INT_EN_INT_INTC		BIT(3)
> > +#define PCIE_INT_EN_INT_INTD		BIT(4)
> 
> These are unused, drop them.
> 
> > +#define PCIE_INT_EN_INT_MSI		BIT(5)
> > +
> > +struct sophgo_pcie {
> > +	struct dw_pcie pci;
> > +	void __iomem *app_base;
> > +	struct clk_bulk_data *clks;
> > +	unsigned int clk_cnt;
> > +	struct reset_control *rst;
> > +	struct irq_domain *irq_domain;
> 
> Indent the member names to align vertically as most other drivers do.
> 
> > +};
> > +
> > +static int sophgo_pcie_readl_app(struct sophgo_pcie *sophgo, u32 reg)
> > +{
> > +	return readl_relaxed(sophgo->app_base + reg);
> > +}
> > +
> > +static void sophgo_pcie_writel_app(struct sophgo_pcie *sophgo, u32 val, u32 reg)
> > +{
> > +	writel_relaxed(val, sophgo->app_base + reg);
> > +}
> > +
> > +static void sophgo_pcie_intx_handler(struct irq_desc *desc)
> > +{
> > +	struct dw_pcie_rp *pp = irq_desc_get_handler_data(desc);
> > +	struct irq_chip *chip = irq_desc_get_chip(desc);
> > +	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> > +	struct sophgo_pcie *sophgo = to_sophgo_pcie(pci);
> > +	unsigned long hwirq = PCIE_SIGNAL_INTX_SHIFT;
> > +	unsigned long reg;
> > +
> > +	chained_irq_enter(chip, desc);
> > +
> > +	reg = sophgo_pcie_readl_app(sophgo, PCIE_INT_SIGNAL);
> > +
> > +	for_each_set_bit_from(hwirq, &reg, PCI_NUM_INTX + PCIE_SIGNAL_INTX_SHIFT)
> 
> Use FIELD_GET() here and iterate through PCI_NUM_INTX.  Then you don't
> need for_each_set_bit_from() and shouldn't need PCIE_SIGNAL_INTX_SHIFT
> here and below.
> 

OK, I will change it

> > +		generic_handle_domain_irq(sophgo->irq_domain,
> > +					  hwirq - PCIE_SIGNAL_INTX_SHIFT);
> > +
> > +	chained_irq_exit(chip, desc);
> > +}
> > +
> > +static void sophgo_intx_mask(struct irq_data *d)
> > +{
> > +	struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d);
> > +	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> > +	struct sophgo_pcie *sophgo = to_sophgo_pcie(pci);
> > +	unsigned long flags;
> > +	u32 val;
> > +
> > +	raw_spin_lock_irqsave(&pp->lock, flags);
> > +
> > +	val = sophgo_pcie_readl_app(sophgo, PCIE_INT_EN);
> > +	val &= ~BIT(d->hwirq + PCIE_INT_EN_INTX_SHIFT);
> 
> FIELD_PREP().
> 
> > +	sophgo_pcie_writel_app(sophgo, val, PCIE_INT_EN);
> > +
> > +	raw_spin_unlock_irqrestore(&pp->lock, flags);
> > +};
> > +
> > +static void sophgo_intx_unmask(struct irq_data *d)
> > +{
> > +	struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d);
> > +	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> > +	struct sophgo_pcie *sophgo = to_sophgo_pcie(pci);
> > +	unsigned long flags;
> > +	u32 val;
> > +
> > +	raw_spin_lock_irqsave(&pp->lock, flags);
> > +
> > +	val = sophgo_pcie_readl_app(sophgo, PCIE_INT_EN);
> > +	val |= BIT(d->hwirq + PCIE_INT_EN_INTX_SHIFT);
> 
> Ditto.
> 
> > +	sophgo_pcie_writel_app(sophgo, val, PCIE_INT_EN);
> > +
> > +	raw_spin_unlock_irqrestore(&pp->lock, flags);
> > +};
> > +
> > +static void sophgo_intx_eoi(struct irq_data *d)
> > +{
> > +}
> > +
> > +static struct irq_chip sophgo_intx_irq_chip = {
> > +	.name			= "INTx",
> > +	.irq_mask		= sophgo_intx_mask,
> > +	.irq_unmask		= sophgo_intx_unmask,
> > +	.irq_eoi		= sophgo_intx_eoi,
> 
> Name these ending with the irq_chip field names, e.g.,
> sophgo_intx_irq_mask(), to make them easier to find with grep.
> 
> Bjorn

Thanks, I will take all the comments and improve the driver.

Regards,
Inochi
diff mbox series

Patch

diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig
index b6d6778b0698..202014acf260 100644
--- a/drivers/pci/controller/dwc/Kconfig
+++ b/drivers/pci/controller/dwc/Kconfig
@@ -341,6 +341,16 @@  config PCIE_ROCKCHIP_DW_EP
 	  Enables support for the DesignWare PCIe controller in the
 	  Rockchip SoC (except RK3399) to work in endpoint mode.
 
+config PCIE_SOPHGO_DW
+	bool "SOPHGO DesignWare PCIe controller"
+	depends on ARCH_SOPHGO || COMPILE_TEST
+	depends on PCI_MSI
+	depends on OF
+	select PCIE_DW_HOST
+	help
+	  Enables support for the DesignWare PCIe controller in the
+	  SOPHGO SoC.
+
 config PCI_EXYNOS
 	tristate "Samsung Exynos PCIe controller"
 	depends on ARCH_EXYNOS || COMPILE_TEST
diff --git a/drivers/pci/controller/dwc/Makefile b/drivers/pci/controller/dwc/Makefile
index a8308d9ea986..193150056dd3 100644
--- a/drivers/pci/controller/dwc/Makefile
+++ b/drivers/pci/controller/dwc/Makefile
@@ -18,6 +18,7 @@  obj-$(CONFIG_PCIE_QCOM_EP) += pcie-qcom-ep.o
 obj-$(CONFIG_PCIE_ARMADA_8K) += pcie-armada8k.o
 obj-$(CONFIG_PCIE_ARTPEC6) += pcie-artpec6.o
 obj-$(CONFIG_PCIE_ROCKCHIP_DW) += pcie-dw-rockchip.o
+obj-$(CONFIG_PCIE_SOPHGO_DW) += pcie-dw-sophgo.o
 obj-$(CONFIG_PCIE_INTEL_GW) += pcie-intel-gw.o
 obj-$(CONFIG_PCIE_KEEMBAY) += pcie-keembay.o
 obj-$(CONFIG_PCIE_KIRIN) += pcie-kirin.o
diff --git a/drivers/pci/controller/dwc/pcie-dw-sophgo.c b/drivers/pci/controller/dwc/pcie-dw-sophgo.c
new file mode 100644
index 000000000000..a4ca4f1e26e0
--- /dev/null
+++ b/drivers/pci/controller/dwc/pcie-dw-sophgo.c
@@ -0,0 +1,282 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCIe host controller driver for Sophgo SoCs.
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/gpio/consumer.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/irqdomain.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/phy/phy.h>
+#include <linux/property.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+
+#include "pcie-designware.h"
+
+#define to_sophgo_pcie(x)		dev_get_drvdata((x)->dev)
+
+#define PCIE_INT_SIGNAL			0xc48
+#define PCIE_INT_EN			0xca0
+
+#define PCIE_SIGNAL_INTX_SHIFT		5
+
+#define PCIE_INT_EN_INTX_SHIFT		1
+#define PCIE_INT_EN_INT_SII		BIT(0)
+#define PCIE_INT_EN_INT_INTA		BIT(1)
+#define PCIE_INT_EN_INT_INTB		BIT(2)
+#define PCIE_INT_EN_INT_INTC		BIT(3)
+#define PCIE_INT_EN_INT_INTD		BIT(4)
+#define PCIE_INT_EN_INT_MSI		BIT(5)
+
+struct sophgo_pcie {
+	struct dw_pcie pci;
+	void __iomem *app_base;
+	struct clk_bulk_data *clks;
+	unsigned int clk_cnt;
+	struct reset_control *rst;
+	struct irq_domain *irq_domain;
+};
+
+static int sophgo_pcie_readl_app(struct sophgo_pcie *sophgo, u32 reg)
+{
+	return readl_relaxed(sophgo->app_base + reg);
+}
+
+static void sophgo_pcie_writel_app(struct sophgo_pcie *sophgo, u32 val, u32 reg)
+{
+	writel_relaxed(val, sophgo->app_base + reg);
+}
+
+static void sophgo_pcie_intx_handler(struct irq_desc *desc)
+{
+	struct dw_pcie_rp *pp = irq_desc_get_handler_data(desc);
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+	struct sophgo_pcie *sophgo = to_sophgo_pcie(pci);
+	unsigned long hwirq = PCIE_SIGNAL_INTX_SHIFT;
+	unsigned long reg;
+
+	chained_irq_enter(chip, desc);
+
+	reg = sophgo_pcie_readl_app(sophgo, PCIE_INT_SIGNAL);
+
+	for_each_set_bit_from(hwirq, &reg, PCI_NUM_INTX + PCIE_SIGNAL_INTX_SHIFT)
+		generic_handle_domain_irq(sophgo->irq_domain,
+					  hwirq - PCIE_SIGNAL_INTX_SHIFT);
+
+	chained_irq_exit(chip, desc);
+}
+
+static void sophgo_intx_mask(struct irq_data *d)
+{
+	struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d);
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+	struct sophgo_pcie *sophgo = to_sophgo_pcie(pci);
+	unsigned long flags;
+	u32 val;
+
+	raw_spin_lock_irqsave(&pp->lock, flags);
+
+	val = sophgo_pcie_readl_app(sophgo, PCIE_INT_EN);
+	val &= ~BIT(d->hwirq + PCIE_INT_EN_INTX_SHIFT);
+	sophgo_pcie_writel_app(sophgo, val, PCIE_INT_EN);
+
+	raw_spin_unlock_irqrestore(&pp->lock, flags);
+};
+
+static void sophgo_intx_unmask(struct irq_data *d)
+{
+	struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d);
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+	struct sophgo_pcie *sophgo = to_sophgo_pcie(pci);
+	unsigned long flags;
+	u32 val;
+
+	raw_spin_lock_irqsave(&pp->lock, flags);
+
+	val = sophgo_pcie_readl_app(sophgo, PCIE_INT_EN);
+	val |= BIT(d->hwirq + PCIE_INT_EN_INTX_SHIFT);
+	sophgo_pcie_writel_app(sophgo, val, PCIE_INT_EN);
+
+	raw_spin_unlock_irqrestore(&pp->lock, flags);
+};
+
+static void sophgo_intx_eoi(struct irq_data *d)
+{
+}
+
+static struct irq_chip sophgo_intx_irq_chip = {
+	.name			= "INTx",
+	.irq_mask		= sophgo_intx_mask,
+	.irq_unmask		= sophgo_intx_unmask,
+	.irq_eoi		= sophgo_intx_eoi,
+};
+
+static int sophgo_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
+				irq_hw_number_t hwirq)
+{
+	irq_set_chip_and_handler(irq, &sophgo_intx_irq_chip, handle_fasteoi_irq);
+	irq_set_chip_data(irq, domain->host_data);
+
+	return 0;
+}
+
+static const struct irq_domain_ops intx_domain_ops = {
+	.map = sophgo_pcie_intx_map,
+};
+
+static int sophgo_pcie_init_irq_domain(struct dw_pcie_rp *pp)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+	struct sophgo_pcie *sophgo = to_sophgo_pcie(pci);
+	struct device *dev = sophgo->pci.dev;
+	struct fwnode_handle *intc;
+	int irq;
+
+	intc = device_get_named_child_node(dev, "interrupt-controller");
+	if (!intc) {
+		dev_err(dev, "missing child interrupt-controller node\n");
+		return -ENODEV;
+	}
+
+	irq = fwnode_irq_get(intc, 0);
+	if (irq < 0) {
+		dev_err(dev, "failed to get INTx irq number\n");
+		fwnode_handle_put(intc);
+		return irq;
+	}
+
+	sophgo->irq_domain = irq_domain_create_linear(intc, PCI_NUM_INTX,
+						      &intx_domain_ops, sophgo);
+	fwnode_handle_put(intc);
+	if (!sophgo->irq_domain) {
+		dev_err(dev, "failed to get a INTx irq domain\n");
+		return -EINVAL;
+	}
+
+	return irq;
+}
+
+static void sophgo_pcie_msi_enable(struct dw_pcie_rp *pp)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+	struct sophgo_pcie *sophgo = to_sophgo_pcie(pci);
+	unsigned long flags;
+	u32 val;
+
+	raw_spin_lock_irqsave(&pp->lock, flags);
+
+	val = sophgo_pcie_readl_app(sophgo, PCIE_INT_EN);
+	val |= PCIE_INT_EN_INT_MSI;
+	sophgo_pcie_writel_app(sophgo, val, PCIE_INT_EN);
+
+	raw_spin_unlock_irqrestore(&pp->lock, flags);
+}
+
+static int sophgo_pcie_host_init(struct dw_pcie_rp *pp)
+{
+	int irq;
+
+	irq = sophgo_pcie_init_irq_domain(pp);
+	if (irq < 0)
+		return irq;
+
+	irq_set_chained_handler_and_data(irq, sophgo_pcie_intx_handler,
+					 pp);
+
+	sophgo_pcie_msi_enable(pp);
+
+	return 0;
+}
+
+static const struct dw_pcie_host_ops sophgo_pcie_host_ops = {
+	.init = sophgo_pcie_host_init,
+};
+
+static int sophgo_pcie_clk_init(struct sophgo_pcie *sophgo)
+{
+	struct device *dev = sophgo->pci.dev;
+	int ret;
+
+	ret = devm_clk_bulk_get_all_enabled(dev, &sophgo->clks);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "failed to get clocks\n");
+
+	sophgo->clk_cnt = ret;
+
+	return 0;
+}
+
+static int sophgo_pcie_resource_get(struct platform_device *pdev,
+				    struct sophgo_pcie *sophgo)
+{
+	sophgo->app_base = devm_platform_ioremap_resource_byname(pdev, "app");
+	if (IS_ERR(sophgo->app_base))
+		return dev_err_probe(&pdev->dev, PTR_ERR(sophgo->app_base),
+				     "failed to map app registers\n");
+
+	return 0;
+}
+
+static int sophgo_pcie_configure_rc(struct sophgo_pcie *sophgo)
+{
+	struct dw_pcie_rp *pp;
+
+	pp = &sophgo->pci.pp;
+	pp->ops = &sophgo_pcie_host_ops;
+
+	return dw_pcie_host_init(pp);
+}
+
+static int sophgo_pcie_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct sophgo_pcie *sophgo;
+	int ret;
+
+	sophgo = devm_kzalloc(dev, sizeof(*sophgo), GFP_KERNEL);
+	if (!sophgo)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, sophgo);
+
+	sophgo->pci.dev = dev;
+
+	ret = sophgo_pcie_resource_get(pdev, sophgo);
+	if (ret)
+		return ret;
+
+	ret = sophgo_pcie_clk_init(sophgo);
+	if (ret)
+		return ret;
+
+	return sophgo_pcie_configure_rc(sophgo);
+}
+
+static const struct of_device_id sophgo_pcie_of_match[] = {
+	{ .compatible = "sophgo,sg2044-pcie" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sophgo_pcie_acpi_match);
+
+static const struct acpi_device_id sophgo_pcie_acpi_match[] = {
+	{ "SOPHO000", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, sophgo_pcie_acpi_match);
+
+static struct platform_driver sophgo_pcie_driver = {
+	.driver = {
+		.name = "sophgo-dw-pcie",
+		.of_match_table = sophgo_pcie_of_match,
+		.acpi_match_table = sophgo_pcie_acpi_match,
+		.suppress_bind_attrs = true,
+	},
+	.probe = sophgo_pcie_probe,
+};
+builtin_platform_driver(sophgo_pcie_driver);