[PATCH v4 10/11] PCI: starfive: Add JH7110 PCIe controller

[Minda Chen <minda.chen@starfivetech.com>]

Add StarFive JH7110 SoC PCIe controller platform
driver codes, and add host init/deinit to pcie-plda-host.c

Signed-off-by: Minda Chen <minda.chen@starfivetech.com>
Co-developed-by: Kevin Xie <kevin.xie@starfivetech.com>
Reviewed-by: Mason Huo <mason.huo@starfivetech.com>
---
 MAINTAINERS                                  |   7 +
 drivers/pci/controller/plda/Kconfig          |  12 +
 drivers/pci/controller/plda/Makefile         |   1 +
 drivers/pci/controller/plda/pcie-plda-host.c | 118 ++++-
 drivers/pci/controller/plda/pcie-plda.h      |  87 +++-
 drivers/pci/controller/plda/pcie-starfive.c  | 460 +++++++++++++++++++
 6 files changed, 680 insertions(+), 5 deletions(-)
 create mode 100644 drivers/pci/controller/plda/pcie-starfive.c

diff --git a/MAINTAINERS b/MAINTAINERS
index bec32d66e711..00ecafffc315 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -16537,6 +16537,13 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/pci/socionext,uniphier-pcie*
 F:	drivers/pci/controller/dwc/pcie-uniphier*
 
+PCIE DRIVER FOR STARFIVE JH71x0
+M:	Kevin Xie <kevin.xie@starfivetech.com>
+L:	linux-pci@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/pci/starfive*
+F:	drivers/pci/controller/plda/pcie-starfive.c
+
 PCIE DRIVER FOR ST SPEAR13XX
 M:	Pratyush Anand <pratyush.anand@gmail.com>
 L:	linux-pci@vger.kernel.org
diff --git a/drivers/pci/controller/plda/Kconfig b/drivers/pci/controller/plda/Kconfig
index e54a82ee94f5..8de661730aa5 100644
--- a/drivers/pci/controller/plda/Kconfig
+++ b/drivers/pci/controller/plda/Kconfig
@@ -15,4 +15,16 @@ config PCIE_MICROCHIP_HOST
 	  Say Y here if you want kernel to support the Microchip AXI PCIe
 	  Host Bridge driver.
 
+config PCIE_STARFIVE_HOST
+	tristate "StarFive PCIe host controller"
+	depends on OF && PCI_MSI
+	select PCIE_PLDA_HOST
+	help
+	  Say Y here if you want to support the StarFive PCIe controller
+	  in host mode. StarFive PCIe controller uses PLDA PCIe
+	  core.
+	  If you choose to build this driver as module it will
+	  be dynamically linked and module will be called
+	  pcie-starfive.ko
+
 endmenu
diff --git a/drivers/pci/controller/plda/Makefile b/drivers/pci/controller/plda/Makefile
index 4340ab007f44..0ac6851bed48 100644
--- a/drivers/pci/controller/plda/Makefile
+++ b/drivers/pci/controller/plda/Makefile
@@ -1,3 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_PCIE_PLDA_HOST) += pcie-plda-host.o
 obj-$(CONFIG_PCIE_MICROCHIP_HOST) += pcie-microchip-host.o
+obj-$(CONFIG_PCIE_STARFIVE_HOST) += pcie-starfive.o
diff --git a/drivers/pci/controller/plda/pcie-plda-host.c b/drivers/pci/controller/plda/pcie-plda-host.c
index 73a7c10d379d..2517d826bae1 100644
--- a/drivers/pci/controller/plda/pcie-plda-host.c
+++ b/drivers/pci/controller/plda/pcie-plda-host.c
@@ -20,6 +20,15 @@
 
 #include "pcie-plda.h"
 
+void __iomem *plda_pcie_map_bus(struct pci_bus *bus, unsigned int devfn,
+				int where)
+{
+	struct plda_pcie_rp *pcie = bus->sysdata;
+
+	return pcie->config_base + PCIE_ECAM_OFFSET(bus->number, devfn, where);
+}
+EXPORT_SYMBOL_GPL(plda_pcie_map_bus);
+
 static void plda_handle_msi(struct irq_desc *desc)
 {
 	struct plda_pcie_rp *port = irq_desc_get_handler_data(desc);
@@ -402,7 +411,6 @@ int plda_init_interrupts(struct platform_device *pdev,
 			 struct plda_pcie_rp *port, struct plda_evt *evt)
 {
 	struct device *dev = &pdev->dev;
-	int irq;
 	int i, intx_irq, msi_irq, event_irq;
 	int ret;
 
@@ -412,8 +420,8 @@ int plda_init_interrupts(struct platform_device *pdev,
 		return ret;
 	}
 
-	irq = platform_get_irq(pdev, 0);
-	if (irq < 0)
+	port->irq = platform_get_irq(pdev, 0);
+	if (port->irq < 0)
 		return -ENODEV;
 
 	for (i = 0; i < port->num_events; i++) {
@@ -440,6 +448,7 @@ int plda_init_interrupts(struct platform_device *pdev,
 		dev_err(dev, "failed to map INTx interrupt\n");
 		return -ENXIO;
 	}
+	port->intx_irq = intx_irq;
 
 	/* Plug the INTx chained handler */
 	irq_set_chained_handler_and_data(intx_irq, plda_handle_intx, port);
@@ -448,12 +457,13 @@ int plda_init_interrupts(struct platform_device *pdev,
 				     evt->msi_evt);
 	if (!msi_irq)
 		return -ENXIO;
+	port->msi_irq = msi_irq;
 
 	/* Plug the MSI chained handler */
 	irq_set_chained_handler_and_data(msi_irq, plda_handle_msi, port);
 
 	/* Plug the main event chained handler */
-	irq_set_chained_handler_and_data(irq, plda_handle_event, port);
+	irq_set_chained_handler_and_data(port->irq, plda_handle_event, port);
 
 	return 0;
 }
@@ -519,3 +529,103 @@ int plda_pcie_setup_iomems(struct pci_host_bridge *bridge,
 	return 0;
 }
 EXPORT_SYMBOL_GPL(plda_pcie_setup_iomems);
+
+static void plda_pcie_irq_domain_deinit(struct plda_pcie_rp *pcie)
+{
+	irq_set_chained_handler_and_data(pcie->irq, NULL, NULL);
+	irq_set_chained_handler_and_data(pcie->msi_irq, NULL, NULL);
+	irq_set_chained_handler_and_data(pcie->intx_irq, NULL, NULL);
+
+	irq_domain_remove(pcie->msi.msi_domain);
+	irq_domain_remove(pcie->msi.dev_domain);
+
+	irq_domain_remove(pcie->intx_domain);
+	irq_domain_remove(pcie->event_domain);
+}
+
+int plda_pcie_host_init(struct plda_pcie_rp *pcie, struct pci_ops *ops)
+{
+	struct resource *cfg_res;
+	struct device *dev = pcie->dev;
+	int ret;
+	struct pci_host_bridge *bridge;
+	struct platform_device *pdev = to_platform_device(dev);
+	struct plda_evt evt = {NULL, NULL, EVENT_PM_MSI_INT_INTX,
+			       EVENT_PM_MSI_INT_MSI};
+
+	pcie->bridge_addr =
+		devm_platform_ioremap_resource_byname(pdev, "apb");
+
+	if (IS_ERR(pcie->bridge_addr))
+		return dev_err_probe(dev, PTR_ERR(pcie->bridge_addr),
+				     "failed to map reg memory\n");
+
+	cfg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
+	if (!cfg_res)
+		return dev_err_probe(dev, -ENODEV,
+				     "failed to get config memory\n");
+
+	pcie->config_base = devm_ioremap_resource(dev, cfg_res);
+	if (IS_ERR(pcie->config_base))
+		return dev_err_probe(dev, PTR_ERR(pcie->config_base),
+				     "failed to map config memory\n");
+
+	pcie->phy = devm_phy_optional_get(dev, NULL);
+	if (IS_ERR(pcie->phy))
+		return dev_err_probe(dev, PTR_ERR(pcie->phy),
+				     "failed to get pcie phy\n");
+
+	bridge = devm_pci_alloc_host_bridge(dev, 0);
+	if (!bridge)
+		return dev_err_probe(dev, -ENOMEM,
+				     "failed to alloc bridge\n");
+
+	pcie->bridge = bridge;
+
+	if (pcie->ops->host_init) {
+		ret = pcie->ops->host_init(pcie);
+		if (ret)
+			return ret;
+	}
+
+	plda_pcie_setup_window(pcie->bridge_addr, 0, cfg_res->start, 0,
+			       resource_size(cfg_res));
+	plda_pcie_setup_iomems(bridge, pcie);
+	plda_set_default_msi(&pcie->msi);
+	ret = plda_init_interrupts(pdev, pcie, &evt);
+	if (ret)
+		goto err_host;
+
+	/* Set default bus ops */
+	bridge->ops = ops;
+	bridge->sysdata = pcie;
+
+	ret = pci_host_probe(bridge);
+	if (ret < 0) {
+		dev_err(dev, "failed to pci host probe: %d\n", ret);
+		goto err_probe;
+	}
+
+	return ret;
+
+err_probe:
+	plda_pcie_irq_domain_deinit(pcie);
+err_host:
+	if (pcie->ops->host_deinit)
+		pcie->ops->host_deinit(pcie);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(plda_pcie_host_init);
+
+void plda_pcie_host_deinit(struct plda_pcie_rp *pcie)
+{
+	pci_stop_root_bus(pcie->bridge->bus);
+	pci_remove_root_bus(pcie->bridge->bus);
+
+	plda_pcie_irq_domain_deinit(pcie);
+
+	if (pcie->ops->host_deinit)
+		pcie->ops->host_deinit(pcie);
+}
+EXPORT_SYMBOL_GPL(plda_pcie_host_deinit);
diff --git a/drivers/pci/controller/plda/pcie-plda.h b/drivers/pci/controller/plda/pcie-plda.h
index 7d470304f047..602d5686ba41 100644
--- a/drivers/pci/controller/plda/pcie-plda.h
+++ b/drivers/pci/controller/plda/pcie-plda.h
@@ -6,14 +6,24 @@
 #ifndef _PCIE_PLDA_H
 #define _PCIE_PLDA_H
 
+#include <linux/phy/phy.h>
+
 /* Number of MSI IRQs */
 #define PLDA_MAX_NUM_MSI_IRQS			32
 
 /* PCIe Bridge Phy Regs */
+#define GEN_SETTINGS				0x80
+#define  RP_ENABLE				1
+#define PCIE_PCI_IDS_DW1			0x9c
+#define  IDS_CLASS_CODE_SHIFT			16
 #define PCIE_PCI_IRQ_DW0			0xa8
 #define  MSIX_CAP_MASK				BIT(31)
 #define  NUM_MSI_MSGS_MASK			GENMASK(6, 4)
 #define  NUM_MSI_MSGS_SHIFT			4
+#define PCI_MISC				0xb4
+#define  PHY_FUNCTION_DIS			BIT(15)
+#define PCIE_WINROM				0xfc
+#define  PREF_MEM_WIN_64_SUPPORT		BIT(3)
 
 #define IMASK_LOCAL				0x180
 #define  DMA_END_ENGINE_0_MASK			0x00000000u
@@ -64,6 +74,8 @@
 #define ISTATUS_HOST				0x18c
 #define IMSI_ADDR				0x190
 #define ISTATUS_MSI				0x194
+#define PMSG_SUPPORT_RX				0x3f0
+#define  PMSG_LTR_SUPPORT			BIT(2)
 
 /* PCIe Master table init defines */
 #define ATR0_PCIE_WIN0_SRCADDR_PARAM		0x600u
@@ -85,6 +97,8 @@
 #define  PCIE_TX_RX_INTERFACE			0x00000000u
 #define  PCIE_CONFIG_INTERFACE			0x00000001u
 
+#define CONFIG_SPACE_ADDR			0x1000u
+
 #define ATR_ENTRY_SIZE				32
 
 #define EVENT_A_ATR_EVT_POST_ERR		0
@@ -107,6 +121,8 @@
 struct plda_pcie_rp;
 
 struct plda_pcie_ops {
+	int (*host_init)(struct plda_pcie_rp *pcie);
+	void (*host_deinit)(struct plda_pcie_rp *pcie);
 	u32 (*get_events)(struct plda_pcie_rp *pcie);
 };
 
@@ -121,12 +137,18 @@ struct plda_msi {
 
 struct plda_pcie_rp {
 	struct device *dev;
+	struct pci_host_bridge *bridge;
 	struct irq_domain *intx_domain;
 	struct irq_domain *event_domain;
 	raw_spinlock_t lock;
 	struct plda_msi msi;
 	const struct plda_pcie_ops *ops;
+	struct phy *phy;
 	void __iomem *bridge_addr;
+	void __iomem *config_base;
+	int irq;
+	int msi_irq;
+	int intx_irq;
 	int num_events;
 };
 
@@ -137,6 +159,7 @@ struct plda_evt {
 	int msi_evt;
 };
 
+void __iomem *plda_pcie_map_bus(struct pci_bus *bus, unsigned int devfn, int where);
 int plda_init_interrupts(struct platform_device *pdev,
 			 struct plda_pcie_rp *port, struct plda_evt *evt);
 void plda_pcie_setup_window(void __iomem *bridge_base_addr, u32 index,
@@ -144,4 +167,66 @@ void plda_pcie_setup_window(void __iomem *bridge_base_addr, u32 index,
 			    size_t size);
 int plda_pcie_setup_iomems(struct pci_host_bridge *bridge,
 			   struct plda_pcie_rp *port);
-#endif
+int plda_pcie_host_init(struct plda_pcie_rp *pcie, struct pci_ops *ops);
+void plda_pcie_host_deinit(struct plda_pcie_rp *pcie);
+
+static inline void plda_set_default_msi(struct plda_msi *msi)
+{
+	msi->vector_phy = IMSI_ADDR;
+	msi->num_vectors = PLDA_MAX_NUM_MSI_IRQS;
+}
+
+static inline void plda_pcie_enable_root_port(struct plda_pcie_rp *plda)
+{
+	u32 value;
+
+	value = readl_relaxed(plda->bridge_addr + GEN_SETTINGS);
+	value |= RP_ENABLE;
+	writel_relaxed(value, plda->bridge_addr + GEN_SETTINGS);
+}
+
+static inline void plda_pcie_set_standard_class(struct plda_pcie_rp *plda)
+{
+	u32 value;
+
+	value = readl_relaxed(plda->bridge_addr + PCIE_PCI_IDS_DW1);
+	value &= 0xff;
+	value |= (PCI_CLASS_BRIDGE_PCI << IDS_CLASS_CODE_SHIFT);
+	writel_relaxed(value, plda->bridge_addr + PCIE_PCI_IDS_DW1);
+}
+
+static inline void plda_pcie_set_pref_win_64bit(struct plda_pcie_rp *plda)
+{
+	u32 value;
+
+	value = readl_relaxed(plda->bridge_addr + PCIE_WINROM);
+	value |= PREF_MEM_WIN_64_SUPPORT;
+	writel_relaxed(value, plda->bridge_addr + PCIE_WINROM);
+}
+
+static inline void plda_pcie_disable_ltr(struct plda_pcie_rp *plda)
+{
+	u32 value;
+
+	value = readl_relaxed(plda->bridge_addr + PMSG_SUPPORT_RX);
+	value &= ~PMSG_LTR_SUPPORT;
+	writel_relaxed(value, plda->bridge_addr + PMSG_SUPPORT_RX);
+}
+
+static inline void plda_pcie_disable_func(struct plda_pcie_rp *plda)
+{
+	u32 value;
+
+	value = readl_relaxed(plda->bridge_addr + PCI_MISC);
+	value |= PHY_FUNCTION_DIS;
+	writel_relaxed(value, plda->bridge_addr + PCI_MISC);
+}
+
+static inline void plda_pcie_write_rc_bar(struct plda_pcie_rp *plda, u64 val)
+{
+	void __iomem *addr = plda->bridge_addr + CONFIG_SPACE_ADDR;
+
+	writel_relaxed(val & 0xffffffff, addr + PCI_BASE_ADDRESS_0);
+	writel_relaxed(val >> 32, addr + PCI_BASE_ADDRESS_1);
+}
+#endif /* _PCIE_PLDA_H */
diff --git a/drivers/pci/controller/plda/pcie-starfive.c b/drivers/pci/controller/plda/pcie-starfive.c
new file mode 100644
index 000000000000..a22f7d681d5a
--- /dev/null
+++ b/drivers/pci/controller/plda/pcie-starfive.c
@@ -0,0 +1,460 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * PCIe host controller driver for StarFive JH7110 Soc.
+ *
+ * Copyright (C) 2023 StarFive Technology Co., Ltd.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_pci.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include "../../pci.h"
+
+#include "pcie-plda.h"
+
+#define PCIE_FUNC_NUM			4
+
+/* system control */
+#define STG_SYSCON_PCIE0_BASE			0x48
+#define STG_SYSCON_PCIE1_BASE			0x1f8
+
+#define STG_SYSCON_ARFUNC_OFFSET		0x78
+#define STG_SYSCON_AXI4_SLVL_ARFUNC_MASK	 GENMASK(22, 8)
+#define STG_SYSCON_AXI4_SLVL_PHY_ARFUNC(x)	 FIELD_PREP(GENMASK(20, 17), x)
+#define STG_SYSCON_AWFUNC_OFFSET		0x7c
+#define STG_SYSCON_AXI4_SLVL_AWFUNC_MASK	 GENMASK(14, 0)
+#define STG_SYSCON_AXI4_SLVL_PHY_AWFUNC(x)	 FIELD_PREP(GENMASK(12, 9), x)
+#define STG_SYSCON_CLKREQ			 BIT(22)
+#define STG_SYSCON_CKREF_SRC_MASK		 GENMASK(19, 18)
+#define STG_SYSCON_RP_NEP_OFFSET		0xe8
+#define STG_SYSCON_K_RP_NEP			 BIT(8)
+#define STG_SYSCON_LNKSTA_OFFSET		0x170
+#define DATA_LINK_ACTIVE			 BIT(5)
+
+/* Parameters for the waiting for link up routine */
+#define LINK_WAIT_MAX_RETRIES	10
+#define LINK_WAIT_USLEEP_MIN	90000
+#define LINK_WAIT_USLEEP_MAX	100000
+
+struct starfive_jh7110_pcie {
+	struct plda_pcie_rp plda;
+	struct reset_control *resets;
+	struct clk_bulk_data *clks;
+	struct regmap *reg_syscon;
+	struct gpio_desc *power_gpio;
+	struct gpio_desc *reset_gpio;
+
+	u32 stg_arfun;
+	u32 stg_awfun;
+	u32 stg_rp_nep;
+	u32 stg_lnksta;
+
+	int num_clks;
+};
+
+/*
+ * The BAR0/1 of bridge should be hidden during enumeration to
+ * avoid the sizing and resource allocation by PCIe core.
+ */
+static bool starfive_pcie_hide_rc_bar(struct pci_bus *bus, unsigned int  devfn,
+				      int offset)
+{
+	if (pci_is_root_bus(bus) && !devfn &&
+	    (offset == PCI_BASE_ADDRESS_0 || offset == PCI_BASE_ADDRESS_1))
+		return true;
+
+	return false;
+}
+
+int starfive_pcie_config_write(struct pci_bus *bus, unsigned int devfn,
+			       int where, int size, u32 value)
+{
+	if (starfive_pcie_hide_rc_bar(bus, devfn, where))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	return pci_generic_config_write(bus, devfn, where, size, value);
+}
+
+int starfive_pcie_config_read(struct pci_bus *bus, unsigned int devfn,
+			      int where, int size, u32 *value)
+{
+	if (starfive_pcie_hide_rc_bar(bus, devfn, where))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	return pci_generic_config_read(bus, devfn, where, size, value);
+}
+
+static int starfive_pcie_parse_dt(struct starfive_jh7110_pcie *pcie, struct device *dev)
+{
+	int pcie_id, stg_pcie_base;
+
+	pcie->num_clks = devm_clk_bulk_get_all(dev, &pcie->clks);
+	if (pcie->num_clks < 0)
+		return dev_err_probe(dev, -ENODEV,
+			"failed to get pcie clocks\n");
+
+	pcie->resets = devm_reset_control_array_get_exclusive(dev);
+	if (IS_ERR(pcie->resets))
+		return dev_err_probe(dev, PTR_ERR(pcie->resets),
+			"failed to get pcie resets");
+
+	pcie->reg_syscon =
+		syscon_regmap_lookup_by_phandle(dev->of_node,
+						"starfive,stg-syscon");
+
+	if (IS_ERR(pcie->reg_syscon))
+		return dev_err_probe(dev, PTR_ERR(pcie->reg_syscon),
+			"failed to parse starfive,stg-syscon\n");
+
+	pcie_id = of_alias_get_id(dev->of_node, "pcie");
+	if (pcie_id < 0 || pcie_id > 1)
+		return dev_err_probe(dev, -ENODEV,
+			"failed to get valid pcie id\n");
+
+	if (pcie_id == 0)
+		stg_pcie_base = STG_SYSCON_PCIE0_BASE;
+	else
+		stg_pcie_base = STG_SYSCON_PCIE1_BASE;
+
+	pcie->stg_arfun = stg_pcie_base + STG_SYSCON_ARFUNC_OFFSET;
+	pcie->stg_awfun = stg_pcie_base + STG_SYSCON_AWFUNC_OFFSET;
+	pcie->stg_rp_nep = stg_pcie_base + STG_SYSCON_RP_NEP_OFFSET;
+	pcie->stg_lnksta = stg_pcie_base + STG_SYSCON_LNKSTA_OFFSET;
+
+	pcie->reset_gpio = devm_gpiod_get_optional(dev, "perst", GPIOD_OUT_HIGH);
+	if (IS_ERR(pcie->reset_gpio)) {
+		dev_warn(dev, "failed to get perst-gpio\n");
+		return -EINVAL;
+	}
+
+	pcie->power_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);
+	if (IS_ERR(pcie->power_gpio)) {
+		dev_warn(dev, "failed to get power-gpio\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static struct pci_ops starfive_pcie_ops = {
+	.map_bus	= plda_pcie_map_bus,
+	.read           = starfive_pcie_config_read,
+	.write          = starfive_pcie_config_write,
+};
+
+static int starfive_pcie_clk_rst_init(struct starfive_jh7110_pcie *pcie)
+{
+	int ret;
+	struct device *dev = pcie->plda.dev;
+
+	ret = clk_bulk_prepare_enable(pcie->num_clks, pcie->clks);
+	if (ret) {
+		dev_err(dev, "failed to enable clocks\n");
+		return ret;
+	}
+
+	ret = reset_control_deassert(pcie->resets);
+	if (ret) {
+		clk_bulk_disable_unprepare(pcie->num_clks, pcie->clks);
+		dev_err(dev, "failed to resets\n");
+	}
+
+	return ret;
+}
+
+static void starfive_pcie_clk_rst_deinit(struct starfive_jh7110_pcie *pcie)
+{
+	reset_control_assert(pcie->resets);
+	clk_bulk_disable_unprepare(pcie->num_clks, pcie->clks);
+}
+
+static bool starfive_pcie_link_up(struct plda_pcie_rp *plda)
+{
+	struct starfive_jh7110_pcie *pcie =
+		container_of(plda, struct starfive_jh7110_pcie, plda);
+	struct device *dev = pcie->plda.dev;
+	int ret;
+	u32 stg_reg_val;
+
+	ret = regmap_read(pcie->reg_syscon, pcie->stg_lnksta, &stg_reg_val);
+	if (ret) {
+		dev_err(dev, "failed to read link status\n");
+		return false;
+	}
+
+	if (stg_reg_val & DATA_LINK_ACTIVE)
+		return true;
+
+	return false;
+}
+
+static int starfive_pcie_host_wait_for_link(struct starfive_jh7110_pcie *pcie)
+{
+	struct device *dev = pcie->plda.dev;
+	int retries;
+
+	/* Check if the link is up or not */
+	for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) {
+		if (starfive_pcie_link_up(&pcie->plda)) {
+			dev_info(dev, "port link up\n");
+			return 0;
+		}
+		usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX);
+	}
+
+	return -ETIMEDOUT;
+}
+
+int starfive_pcie_enable_phy(struct device *dev, struct plda_pcie_rp *pcie)
+{
+	int ret;
+
+	if (!pcie->phy)
+		return 0;
+
+	ret = phy_init(pcie->phy);
+	if (ret)
+		return dev_err_probe(dev, ret,
+			"failed to initialize pcie phy\n");
+
+	ret = phy_set_mode(pcie->phy, PHY_MODE_PCIE);
+	if (ret) {
+		dev_err(dev, "failed to set pcie mode\n");
+		goto err_phy_on;
+	}
+
+	ret = phy_power_on(pcie->phy);
+	if (ret) {
+		dev_err(dev, "failed to power on pcie phy\n");
+		goto err_phy_on;
+	}
+
+	return 0;
+
+err_phy_on:
+	phy_exit(pcie->phy);
+	return ret;
+}
+
+void starfive_pcie_disable_phy(struct plda_pcie_rp *pcie)
+{
+	phy_power_off(pcie->phy);
+	phy_exit(pcie->phy);
+}
+
+static void starfive_pcie_host_deinit(struct plda_pcie_rp *plda)
+{
+	struct starfive_jh7110_pcie *pcie =
+		container_of(plda, struct starfive_jh7110_pcie, plda);
+
+	starfive_pcie_clk_rst_deinit(pcie);
+	if (pcie->power_gpio)
+		gpiod_set_value_cansleep(pcie->power_gpio, 0);
+	starfive_pcie_disable_phy(plda);
+}
+
+static int starfive_pcie_host_init(struct plda_pcie_rp *plda)
+{
+	int i;
+	struct starfive_jh7110_pcie *pcie =
+		container_of(plda, struct starfive_jh7110_pcie, plda);
+	struct device *dev = plda->dev;
+	int ret;
+
+	ret = starfive_pcie_enable_phy(dev, plda);
+	if (ret)
+		return ret;
+
+	regmap_update_bits(pcie->reg_syscon, pcie->stg_rp_nep,
+			   STG_SYSCON_K_RP_NEP, STG_SYSCON_K_RP_NEP);
+
+	regmap_update_bits(pcie->reg_syscon, pcie->stg_awfun,
+			   STG_SYSCON_CKREF_SRC_MASK,
+			   FIELD_PREP(STG_SYSCON_CKREF_SRC_MASK, 2));
+
+	regmap_update_bits(pcie->reg_syscon, pcie->stg_awfun,
+			   STG_SYSCON_CLKREQ, STG_SYSCON_CLKREQ);
+
+	ret = starfive_pcie_clk_rst_init(pcie);
+	if (ret)
+		return ret;
+
+	if (pcie->power_gpio)
+		gpiod_set_value_cansleep(pcie->power_gpio, 1);
+
+	if (pcie->reset_gpio)
+		gpiod_set_value_cansleep(pcie->reset_gpio, 1);
+
+	/* Disable physical functions except #0 */
+	for (i = 1; i < PCIE_FUNC_NUM; i++) {
+		regmap_update_bits(pcie->reg_syscon,
+				   pcie->stg_arfun,
+				   STG_SYSCON_AXI4_SLVL_ARFUNC_MASK,
+				   STG_SYSCON_AXI4_SLVL_PHY_ARFUNC(i));
+
+		regmap_update_bits(pcie->reg_syscon,
+				   pcie->stg_awfun,
+				   STG_SYSCON_AXI4_SLVL_AWFUNC_MASK,
+				   STG_SYSCON_AXI4_SLVL_PHY_AWFUNC(i));
+
+		plda_pcie_disable_func(plda);
+	}
+
+	regmap_update_bits(pcie->reg_syscon, pcie->stg_arfun,
+			   STG_SYSCON_AXI4_SLVL_ARFUNC_MASK, 0);
+	regmap_update_bits(pcie->reg_syscon, pcie->stg_awfun,
+			   STG_SYSCON_AXI4_SLVL_AWFUNC_MASK, 0);
+
+	plda_pcie_enable_root_port(plda);
+	plda_pcie_write_rc_bar(plda, 0);
+
+	/* PCIe PCI Standard Configuration Identification Settings. */
+	plda_pcie_set_standard_class(plda);
+
+	/*
+	 * The LTR message forwarding of PCIe Message Reception was set by core
+	 * as default, but the forward id & addr are also need to be reset.
+	 * If we do not disable LTR message forwarding here, or set a legal
+	 * forwarding address, the kernel will get stuck after this driver probe.
+	 * To workaround, disable the LTR message forwarding support on
+	 * PCIe Message Reception.
+	 */
+	plda_pcie_disable_ltr(plda);
+
+	/* Prefetchable memory window 64-bit addressing support */
+	plda_pcie_set_pref_win_64bit(plda);
+
+	/* Ensure that PERST has been asserted for at least 100 ms,
+	 * the sleep value is T_PVPERL from PCIe CEM spec r2.0 (Table 2-4)
+	 */
+	msleep(100);
+	if (pcie->reset_gpio)
+		gpiod_set_value_cansleep(pcie->reset_gpio, 0);
+
+	/* As the requirement in PCIe base spec r6.0, system (<=5GT/s) must
+	 * wait a minimum of 100 ms following exit from a conventional reset
+	 * before sending a configuration request to the device.
+	 */
+	msleep(100);
+
+	if (starfive_pcie_host_wait_for_link(pcie))
+		dev_info(dev, "port link down\n");
+
+	return ret;
+}
+
+static const struct plda_pcie_ops pcie_ops = {
+	.host_init = starfive_pcie_host_init,
+	.host_deinit = starfive_pcie_host_deinit,
+};
+
+static int starfive_pcie_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct starfive_jh7110_pcie *pcie;
+	struct plda_pcie_rp *plda;
+	int ret;
+
+	pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
+	if (!pcie)
+		return -ENOMEM;
+
+	plda = &pcie->plda;
+	plda->dev = dev;
+
+	ret = starfive_pcie_parse_dt(pcie, dev);
+	if (ret)
+		return ret;
+
+	plda->ops = &pcie_ops;
+	plda->num_events = NUM_PLDA_EVENTS;
+	ret = plda_pcie_host_init(&pcie->plda, &starfive_pcie_ops);
+	if (ret)
+		return ret;
+
+	pm_runtime_enable(&pdev->dev);
+	pm_runtime_get_sync(&pdev->dev);
+	platform_set_drvdata(pdev, pcie);
+
+	return 0;
+}
+
+static void starfive_pcie_remove(struct platform_device *pdev)
+{
+	struct starfive_jh7110_pcie *pcie = platform_get_drvdata(pdev);
+
+	plda_pcie_host_deinit(&pcie->plda);
+	platform_set_drvdata(pdev, NULL);
+}
+
+static int starfive_pcie_suspend_noirq(struct device *dev)
+{
+	struct starfive_jh7110_pcie *pcie = dev_get_drvdata(dev);
+
+	if (!pcie)
+		return 0;
+
+	clk_bulk_disable_unprepare(pcie->num_clks, pcie->clks);
+	starfive_pcie_disable_phy(&pcie->plda);
+
+	return 0;
+}
+
+static int starfive_pcie_resume_noirq(struct device *dev)
+{
+	struct starfive_jh7110_pcie *pcie = dev_get_drvdata(dev);
+	int ret;
+
+	ret = starfive_pcie_enable_phy(dev, &pcie->plda);
+	if (ret)
+		return ret;
+
+	ret = clk_bulk_prepare_enable(pcie->num_clks, pcie->clks);
+	if (ret) {
+		dev_err(dev, "failed to enable clocks\n");
+		starfive_pcie_disable_phy(&pcie->plda);
+		return ret;
+	}
+
+	return ret;
+}
+
+static const struct dev_pm_ops starfive_pcie_pm_ops = {
+	NOIRQ_SYSTEM_SLEEP_PM_OPS(starfive_pcie_suspend_noirq,
+				  starfive_pcie_resume_noirq)
+};
+
+static const struct of_device_id starfive_pcie_of_match[] = {
+	{ .compatible = "starfive,jh7110-pcie"},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, starfive_pcie_of_match);
+
+static struct platform_driver starfive_pcie_driver = {
+	.driver = {
+		.name = "pcie-starfive",
+		.of_match_table = of_match_ptr(starfive_pcie_of_match),
+#ifdef CONFIG_PM_SLEEP
+		.pm = &starfive_pcie_pm_ops,
+#endif
+	},
+	.probe = starfive_pcie_probe,
+	.remove_new = starfive_pcie_remove,
+};
+module_platform_driver(starfive_pcie_driver);
+
+MODULE_DESCRIPTION("StarFive JH7110 PCIe host driver");
+MODULE_LICENSE("GPL v2");
-- 
2.17.1