[PATCH 3/4] pcie: s32g: Add initial PCIe support (RC)

Vincent Guittot
2025-09-12T14:14:59Z

Add initial support of the PCIe controller for S32G Soc family. Only
host mode is supported.

Co-developed-by: Ionut Vicovan <Ionut.Vicovan@nxp.com>
Signed-off-by: Ionut Vicovan <Ionut.Vicovan@nxp.com>
Co-developed-by: Ciprian Marian Costea <ciprianmarian.costea@nxp.com>
Signed-off-by: Ciprian Marian Costea <ciprianmarian.costea@nxp.com>
Co-developed-by: Ghennadi Procopciuc <Ghennadi.Procopciuc@nxp.com>
Signed-off-by: Ghennadi Procopciuc <Ghennadi.Procopciuc@nxp.com>
Co-developed-by: Larisa Grigore <larisa.grigore@nxp.com>
Signed-off-by: Larisa Grigore <larisa.grigore@nxp.com>
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
---
drivers/pci/controller/dwc/Kconfig | 12 +
drivers/pci/controller/dwc/Makefile | 1 +
drivers/pci/controller/dwc/pci-s32g-regs.h | 105 ++++
drivers/pci/controller/dwc/pci-s32g.c | 697 +++++++++++++++++++++
drivers/pci/controller/dwc/pci-s32g.h | 45 ++
5 files changed, 860 insertions(+)
create mode 100644 drivers/pci/controller/dwc/pci-s32g-regs.h
create mode 100644 drivers/pci/controller/dwc/pci-s32g.c
create mode 100644 drivers/pci/controller/dwc/pci-s32g.h

diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig
index ff6b6d9e18ec..39d9a47f6fea 100644
--- a/drivers/pci/controller/dwc/Kconfig
+++ b/drivers/pci/controller/dwc/Kconfig
@@ -255,6 +255,18 @@ config PCIE_TEGRA194_EP
in order to enable device-specific features PCIE_TEGRA194_EP must be
selected. This uses the DesignWare core.

+config PCI_S32G
+ bool "NXP S32G PCIe controller (host mode)"
+ depends on ARCH_S32 || (OF && COMPILE_TEST)
+ select PCIE_DW_HOST
+ help
+ Enable support for the PCIe controller in NXP S32G based boards to
+ work in Host mode. The controller is based on Designware IP and
+ can work either as RC or EP. In order to enable host-specific
+ features PCI_S32G must be selected and in order to enable
+ device-specific features PCI_S32G_EP must be selected.
+
+
config PCIE_DW_PLAT
bool

diff --git a/drivers/pci/controller/dwc/Makefile b/drivers/pci/controller/dwc/Makefile
index 6919d27798d1..69f8e80fdae4 100644
--- a/drivers/pci/controller/dwc/Makefile
+++ b/drivers/pci/controller/dwc/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_PCIE_SPEAR13XX) += pcie-spear13xx.o
obj-$(CONFIG_PCI_KEYSTONE) += pci-keystone.o
obj-$(CONFIG_PCI_LAYERSCAPE) += pci-layerscape.o
obj-$(CONFIG_PCI_LAYERSCAPE_EP) += pci-layerscape-ep.o
+obj-$(CONFIG_PCI_S32G) += pci-s32g.o
obj-$(CONFIG_PCIE_QCOM_COMMON) += pcie-qcom-common.o
obj-$(CONFIG_PCIE_QCOM) += pcie-qcom.o
obj-$(CONFIG_PCIE_QCOM_EP) += pcie-qcom-ep.o
diff --git a/drivers/pci/controller/dwc/pci-s32g-regs.h b/drivers/pci/controller/dwc/pci-s32g-regs.h
new file mode 100644
index 000000000000..e7ad1b6b7aa5
--- /dev/null
+++ b/drivers/pci/controller/dwc/pci-s32g-regs.h
@@ -0,0 +1,105 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2015-2016 Freescale Semiconductor, Inc.
+ * Copyright 2016-2023, 2025 NXP
+ */
+
+#ifndef PCI_S32G_REGS_H
+#define PCI_S32G_REGS_H
+
+/* Instance PCIE_SS - CTRL register offsets (ctrl base) */
+#define LINK_INT_CTRL_STS (0x40U)
+#define LINK_REQ_RST_NOT_INT_EN BIT(1)
+#define LINK_REQ_RST_NOT_CLR BIT(2)
+
+/* PCIe controller 0 general control 1 (PE0_GEN_CTRL_1) (ctrl base) */
+#define PE0_GEN_CTRL_1 (0x50U)
+#define SS_DEVICE_TYPE_MASK GENMASK(3, 0)
+#define SS_DEVICE_TYPE(x) FIELD_PREP(SS_DEVICE_TYPE_MASK, x)
+
+enum pcie_dev_type_val {
+ PCIE_EP_VAL = 0x0,
+ PCIE_RC_VAL = 0x4
+};
+
+#define SRIS_MODE_EN BIT(8)
+
+/* PCIe controller 0 general control 3 (PE0_GEN_CTRL_3) (ctrl base) */
+#define PE0_GEN_CTRL_3 (0x58U)
+/* LTSSM Enable. Active high. Set it low to hold the LTSSM in Detect state. */
+#define LTSSM_EN BIT(0)
+
+/* PCIe Controller 0 Link Debug 2 (ctrl base) */
+#define PCIE_SS_PE0_LINK_DBG_2 (0xB4U)
+#define PCIE_SS_SMLH_LTSSM_STATE_MASK GENMASK(5, 0)
+#define PCIE_SS_SMLH_LINK_UP BIT(6)
+#define PCIE_SS_RDLH_LINK_UP BIT(7)
+#define LTSSM_STATE_L0 0x11U /* L0 state */
+#define LTSSM_STATE_L0S 0x12U /* L0S state */
+#define LTSSM_STATE_L1_IDLE 0x14U /* L1_IDLE state */
+#define LTSSM_STATE_HOT_RESET 0x1FU /* HOT_RESET state */
+
+/* PCIe Controller 0 Interrupt Status (ctrl base) */
+#define PE0_INT_STS (0xE8U)
+#define HP_INT_STS BIT(6)
+
+/* Status and Command Register. pci-regs.h */
+
+/* Instance PCIE_CAP */
+#define PCIE_CAP_BASE (0x70U)
+
+/* Device Control and Status Register. */
+#define CAP_DEVICE_CONTROL_DEVICE_STATUS (PCIE_CAP_BASE + PCI_EXP_DEVCTL)
+#define CAP_CORR_ERR_REPORT_EN BIT(0)
+#define CAP_NON_FATAL_ERR_REPORT_EN BIT(1)
+#define CAP_FATAL_ERR_REPORT_EN BIT(2)
+#define CAP_UNSUPPORT_REQ_REP_EN BIT(3)
+#define CAP_EN_REL_ORDER BIT(4)
+#define CAP_MAX_PAYLOAD_SIZE_CS_MASK GENMASK(7, 5)
+#define CAP_MAX_PAYLOAD_SIZE_CS(x) FIELD_PREP(CAP_MAX_PAYLOAD_SIZE_CS_MASK, x)
+#define CAP_MAX_READ_REQ_SIZE_MASK GENMASK(14, 12)
+#define CAP_MAX_READ_REQ_SIZE(x) FIELD_PREP(CAP_MAX_READ_REQ_SIZE_MASK, x)
+
+/* Link Control and Status Register. */
+#define PCIE_CTRL_LINK_STATUS (PCIE_CAP_BASE + PCI_EXP_LNKCTL)
+#define PCIE_CAP_RETRAIN_LINK BIT(5)
+#define PCIE_CAP_LINK_TRAINING BIT(27)
+
+/* Slot Control and Status Register */
+#define PCIE_SLOT_CONTROL_SLOT_STATUS (PCIE_CAP_BASE + PCI_EXP_SLTCTL)
+#define PCIE_CAP_PRESENCE_DETECT_CHANGE_EN BIT(3)
+#define PCIE_CAP_HOT_PLUG_INT_EN BIT(5)
+#define PCIE_CAP_DLL_STATE_CHANGED_EN BIT(12)
+
+/* Link Control 2 and Status 2 Register. */
+#define CAP_LINK_CONTROL2_LINK_STATUS2 (PCIE_CAP_BASE + PCI_EXP_LNKCTL2)
+#define PCIE_CAP_TARGET_LINK_SPEED_MASK GENMASK(3, 0)
+#define PCIE_CAP_TARGET_LINK_SPEED(x) FIELD_PREP(PCIE_CAP_TARGET_LINK_SPEED_MASK, x)
+
+/* Instance PCIE_PORT_LOGIC - DBI register offsets */
+#define PCIE_PORT_LOGIC_BASE (0x700U)
+
+/* Port Force Link Register. pcie-designware.h */
+
+/* Link Width and Speed Change Control Register. pcie-designware.h */
+
+/* Gen3 Control Register. pcie-designware.h */
+#define PCIE_EQ_PHASE_2_3 BIT(9)
+
+/* Gen3 EQ Control Register. pcie-designware.h */
+
+/* ACE Cache Coherency Control Register 3 */
+#define PORT_LOGIC_COHERENCY_CONTROL_1 (PCIE_PORT_LOGIC_BASE + 0x1E0U)
+#define PORT_LOGIC_COHERENCY_CONTROL_2 (PCIE_PORT_LOGIC_BASE + 0x1E4U)
+#define PORT_LOGIC_COHERENCY_CONTROL_3 (PCIE_PORT_LOGIC_BASE + 0x1E8U)
+/*
+ * See definition of register "ACE Cache Coherency Control Register 1"
+ * (COHERENCY_CONTROL_1_OFF) in the SoC RM
+ */
+#define CC_1_MEMTYPE_BOUNDARY_MASK GENMASK(31, 2)
+#define CC_1_MEMTYPE_BOUNDARY(x) FIELD_PREP(CC_1_MEMTYPE_BOUNDARY_MASK, x)
+#define CC_1_MEMTYPE_VALUE BIT(0)
+#define CC_1_MEMTYPE_LOWER_PERIPH 0x0
+#define CC_1_MEMTYPE_LOWER_MEM 0x1
+
+#endif /* PCI_S32G_REGS_H */
diff --git a/drivers/pci/controller/dwc/pci-s32g.c b/drivers/pci/controller/dwc/pci-s32g.c
new file mode 100644
index 000000000000..3a7c2fc83432
--- /dev/null
+++ b/drivers/pci/controller/dwc/pci-s32g.c
@@ -0,0 +1,697 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCIe host controller driver for NXP S32G SoCs
+ *
+ * Copyright 2019-2025 NXP
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/pci.h>
+#include <linux/phy.h>
+#include <linux/phy/phy.h>
+#include <linux/interrupt.h>
+#include <linux/pm_runtime.h>
+#include <linux/io.h>
+#include <linux/sizes.h>
+
+#include "pcie-designware.h"
+#include "pci-s32g-regs.h"
+#include "pci-s32g.h"
+
+static void s32g_pcie_writel_ctrl(struct s32g_pcie *pci, u32 reg, u32 val)
+{
+ if (dw_pcie_write(pci->ctrl_base + reg, 0x4, val))
+ dev_err(pci->pcie.dev, "Write ctrl address failed\n");
+}
+
+static u32 s32g_pcie_readl_ctrl(struct s32g_pcie *pci, u32 reg)
+{
+ u32 val = 0;
+
+ if (dw_pcie_read(pci->ctrl_base + reg, 0x4, &val))
+ dev_err(pci->pcie.dev, "Read ctrl address failed\n");
+
+ return val;
+}
+
+static void s32g_pcie_enable_ltssm(struct s32g_pcie *pci)
+{
+ u32 reg;
+
+ reg = s32g_pcie_readl_ctrl(pci, PE0_GEN_CTRL_3);
+ reg |= LTSSM_EN;
+ s32g_pcie_writel_ctrl(pci, PE0_GEN_CTRL_3, reg);
+}
+
+static void s32g_pcie_disable_ltssm(struct s32g_pcie *pci)
+{
+ u32 reg;
+
+ reg = s32g_pcie_readl_ctrl(pci, PE0_GEN_CTRL_3);
+ reg &= ~LTSSM_EN;
+ s32g_pcie_writel_ctrl(pci, PE0_GEN_CTRL_3, reg);
+}
+
+static bool is_s32g_pcie_ltssm_enabled(struct s32g_pcie *pci)
+{
+ return (s32g_pcie_readl_ctrl(pci, PE0_GEN_CTRL_3) & LTSSM_EN);
+}
+
+#define PCIE_LINKUP (PCIE_SS_SMLH_LINK_UP | PCIE_SS_RDLH_LINK_UP)
+
+static bool has_data_phy_link(struct s32g_pcie *s32g_pp)
+{
+ u32 val = s32g_pcie_readl_ctrl(s32g_pp, PCIE_SS_PE0_LINK_DBG_2);
+
+ if ((val & PCIE_LINKUP) == PCIE_LINKUP) {
+ switch (val & PCIE_SS_SMLH_LTSSM_STATE_MASK) {
+ case LTSSM_STATE_L0:
+ case LTSSM_STATE_L0S:
+ case LTSSM_STATE_L1_IDLE:
+ return true;
+ default:
+ return false;
+ }
+ }
+
+ return false;
+}
+
+static struct pci_bus *s32g_get_child_downstream_bus(struct pci_bus *bus)
+{
+ struct pci_bus *child, *root_bus = NULL;
+
+ list_for_each_entry(child, &bus->children, node) {
+ if (child->parent == bus) {
+ root_bus = child;
+ break;
+ }
+ }
+
+ if (!root_bus)
+ return ERR_PTR(-ENODEV);
+
+ return root_bus;
+}
+
+static bool s32g_pcie_link_is_up(struct dw_pcie *pcie)
+{
+ struct s32g_pcie *s32g_pp = to_s32g_from_dw_pcie(pcie);
+
+ if (!is_s32g_pcie_ltssm_enabled(s32g_pp))
+ return 0;
+
+ return has_data_phy_link(s32g_pp);
+}
+
+/* Use 200ms for PHY link timeout (slightly larger than 100ms, which PCIe standard requests
+ * to wait "before sending a Configuration Request to the device")
+ */
+#define PCIE_LINK_TIMEOUT_US (200 * USEC_PER_MSEC)
+#define PCIE_LINK_WAIT_US 1000
+
+static int s32g_pcie_start_link(struct dw_pcie *pcie)
+{
+ struct s32g_pcie *s32g_pp = to_s32g_from_dw_pcie(pcie);
+ u32 reg, tmp;
+ int ret;
+
+ /* Don't do anything if not Root Complex */
+ if (!is_s32g_pcie_rc(s32g_pp->mode))
+ return 0;
+
+ if (pcie->max_link_speed >= 1 && pcie->max_link_speed < 3) {
+ /* Limit max link speed */
+ reg = dw_pcie_readl_dbi(pcie, CAP_LINK_CONTROL2_LINK_STATUS2);
+ reg &= ~(PCIE_CAP_TARGET_LINK_SPEED_MASK);
+ reg |= PCIE_CAP_TARGET_LINK_SPEED(pcie->max_link_speed);
+ dw_pcie_writel_dbi(pcie, CAP_LINK_CONTROL2_LINK_STATUS2, reg);
+
+ if (is_s32g_pcie_ltssm_enabled(s32g_pp)) {
+ ret = read_poll_timeout(dw_pcie_readl_dbi, tmp,
+ !(tmp & PCIE_CAP_LINK_TRAINING),
+ PCIE_LINK_WAIT_US, PCIE_LINK_TIMEOUT_US, 0,
+ pcie, PCIE_CTRL_LINK_STATUS);
+ if (ret)
+ dev_warn(s32g_pp->pcie.dev,
+ "Failed to finalize link training\n");
+
+ reg = dw_pcie_readl_dbi(pcie, PCIE_CTRL_LINK_STATUS);
+ reg |= PCIE_CAP_RETRAIN_LINK;
+ dw_pcie_writel_dbi(pcie, PCIE_CTRL_LINK_STATUS, reg);
+ }
+ }
+
+ /* Start LTSSM. */
+ s32g_pcie_enable_ltssm(s32g_pp);
+
+ return 0;
+}
+
+static void s32g_pcie_stop_link(struct dw_pcie *pcie)
+{
+ struct s32g_pcie *s32g_pp = to_s32g_from_dw_pcie(pcie);
+
+ s32g_pcie_disable_ltssm(s32g_pp);
+}
+
+struct dw_pcie_ops s32g_pcie_ops = {
+ .link_up = s32g_pcie_link_is_up,
+ .start_link = s32g_pcie_start_link,
+ .stop_link = s32g_pcie_stop_link,
+};
+
+static struct dw_pcie_host_ops s32g_pcie_host_ops;
+
+static void s32g_pcie_set_phy_mode(struct s32g_pcie *s32g_pp)
+{
+ struct dw_pcie *pcie = &s32g_pp->pcie;
+ struct device *dev = pcie->dev;
+ struct device_node *np = dev->of_node;
+ const char *pcie_phy_mode = NULL;
+ int ret;
+
+ ret = of_property_read_string(np, "nxp,phy-mode", &pcie_phy_mode);
+ if (ret || !pcie_phy_mode) {
+ dev_info(dev, "Missing 'nxp,phy-mode' property, using default CRNS\n");
+ s32g_pp->phy_mode = CRNS;
+ } else if (!strcmp(pcie_phy_mode, "crns")) {
+ s32g_pp->phy_mode = CRNS;
+ } else if (!strcmp(pcie_phy_mode, "crss")) {
+ s32g_pp->phy_mode = CRSS;
+ } else if (!strcmp(pcie_phy_mode, "srns")) {
+ s32g_pp->phy_mode = SRNS;
+ } else if (!strcmp(pcie_phy_mode, "sris")) {
+ s32g_pp->phy_mode = SRIS;
+ } else {
+ dev_warn(dev, "Unsupported 'nxp,phy-mode' specified, using default CRNS\n");
+ s32g_pp->phy_mode = CRNS;
+ }
+}
+
+static void disable_equalization(struct dw_pcie *pcie)
+{
+ u32 val;
+
+ val = dw_pcie_readl_dbi(pcie, GEN3_EQ_CONTROL_OFF);
+ val &= ~(GEN3_EQ_CONTROL_OFF_FB_MODE |
+ GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC);
+ val |= FIELD_PREP(GEN3_EQ_CONTROL_OFF_FB_MODE, 1) |
+ FIELD_PREP(GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC, 0x84);
+ dw_pcie_dbi_ro_wr_en(pcie);
+ dw_pcie_writel_dbi(pcie, GEN3_EQ_CONTROL_OFF, val);
+ dw_pcie_dbi_ro_wr_dis(pcie);
+}
+
+static void s32g_pcie_reset_mstr_ace(struct dw_pcie *pcie, u64 ddr_base_addr)
+{
+ u32 ddr_base_low = lower_32_bits(ddr_base_addr);
+ u32 ddr_base_high = upper_32_bits(ddr_base_addr);
+
+ dw_pcie_dbi_ro_wr_en(pcie);
+ dw_pcie_writel_dbi(pcie, PORT_LOGIC_COHERENCY_CONTROL_3, 0x0);
+ /* Transactions to peripheral targets should be non-coherent,
+ * or Ncore might drop them. Define the start of DDR as seen by Linux
+ * as the boundary between "memory" and "peripherals", with peripherals
+ * being below this boundary, and memory addresses being above it.
+ * One example where this is needed are PCIe MSIs, which use NoSnoop=0
+ * and might end up routed to Ncore.
+ */
+ dw_pcie_writel_dbi(pcie, PORT_LOGIC_COHERENCY_CONTROL_1,
+ (ddr_base_low & CC_1_MEMTYPE_BOUNDARY_MASK) |
+ (CC_1_MEMTYPE_LOWER_PERIPH & CC_1_MEMTYPE_VALUE));
+ dw_pcie_writel_dbi(pcie, PORT_LOGIC_COHERENCY_CONTROL_2, ddr_base_high);
+ dw_pcie_dbi_ro_wr_dis(pcie);
+}
+
+static int init_pcie(struct s32g_pcie *s32g_pp)
+{
+ struct dw_pcie *pcie = &s32g_pp->pcie;
+ u32 val;
+
+ val = s32g_pcie_readl_ctrl(s32g_pp, PE0_GEN_CTRL_1);
+ val &= ~SS_DEVICE_TYPE_MASK;
+
+ if (is_s32g_pcie_rc(s32g_pp->mode))
+ val |= SS_DEVICE_TYPE(PCIE_RC_VAL);
+ else
+ val |= SS_DEVICE_TYPE(PCIE_EP_VAL);
+
+ if (s32g_pp->phy_mode == SRIS)
+ val |= SRIS_MODE_EN;
+ else
+ val &= ~SRIS_MODE_EN;
+
+ s32g_pcie_writel_ctrl(s32g_pp, PE0_GEN_CTRL_1, val);
+
+ /* Disable phase 2,3 equalization */
+ disable_equalization(pcie);
+
+ /* Make sure DBI registers are R/W - see dw_pcie_setup_rc */
+ dw_pcie_dbi_ro_wr_en(pcie);
+ dw_pcie_setup(pcie);
+ dw_pcie_dbi_ro_wr_dis(pcie);
+
+ /* Make sure we use the coherency defaults (just in case the settings
+ * have been changed from their reset values
+ */
+ s32g_pcie_reset_mstr_ace(pcie, s32g_pp->coherency_base);
+
+ val = dw_pcie_readl_dbi(pcie, PCIE_PORT_FORCE);
+ val |= PORT_FORCE_DO_DESKEW_FOR_SRIS;
+ dw_pcie_dbi_ro_wr_en(pcie);
+ dw_pcie_writel_dbi(pcie, PCIE_PORT_FORCE, val);
+
+ if (is_s32g_pcie_rc(s32g_pp->mode)) {
+ /* Set max payload supported, 256 bytes and
+ * relaxed ordering.
+ */
+ val = dw_pcie_readl_dbi(pcie, CAP_DEVICE_CONTROL_DEVICE_STATUS);
+ val &= ~(CAP_EN_REL_ORDER |
+ CAP_MAX_PAYLOAD_SIZE_CS_MASK |
+ CAP_MAX_READ_REQ_SIZE_MASK);
+ val |= CAP_EN_REL_ORDER |
+ CAP_MAX_PAYLOAD_SIZE_CS(1) |
+ CAP_MAX_READ_REQ_SIZE(1);
+ dw_pcie_writel_dbi(pcie, CAP_DEVICE_CONTROL_DEVICE_STATUS, val);
+
+ /* Enable the IO space, Memory space, Bus master,
+ * Parity error, Serr and disable INTx generation
+ */
+ dw_pcie_writel_dbi(pcie, PCI_COMMAND,
+ PCI_COMMAND_SERR | PCI_COMMAND_PARITY |
+ PCI_COMMAND_INTX_DISABLE | PCI_COMMAND_IO |
+ PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
+
+ /* Enable errors */
+ val = dw_pcie_readl_dbi(pcie, CAP_DEVICE_CONTROL_DEVICE_STATUS);
+ val |= CAP_CORR_ERR_REPORT_EN |
+ CAP_NON_FATAL_ERR_REPORT_EN |
+ CAP_FATAL_ERR_REPORT_EN |
+ CAP_UNSUPPORT_REQ_REP_EN;
+ dw_pcie_writel_dbi(pcie, CAP_DEVICE_CONTROL_DEVICE_STATUS, val);
+ }
+
+ val = dw_pcie_readl_dbi(pcie, GEN3_RELATED_OFF);
+ val |= PCIE_EQ_PHASE_2_3;
+ dw_pcie_writel_dbi(pcie, GEN3_RELATED_OFF, val);
+
+ /* Disable writing dbi registers */
+ dw_pcie_dbi_ro_wr_dis(pcie);
+
+ s32g_pcie_enable_ltssm(s32g_pp);
+
+ return 0;
+}
+
+static int init_pcie_phy(struct s32g_pcie *s32g_pp)
+{
+ struct dw_pcie *pcie = &s32g_pp->pcie;
+ struct device *dev = pcie->dev;
+ int ret;
+
+ ret = phy_init(s32g_pp->phy);
+ if (ret) {
+ dev_err(dev, "Failed to init serdes PHY\n");
+ return ret;
+ }
+
+ ret = phy_set_mode_ext(s32g_pp->phy, PHY_MODE_PCIE,
+ s32g_pp->phy_mode);
+ if (ret) {
+ dev_err(dev, "Failed to set mode on serdes PHY\n");
+ goto err_phy_exit;
+ }
+
+ ret = phy_power_on(s32g_pp->phy);
+ if (ret) {
+ dev_err(dev, "Failed to power on serdes PHY\n");
+ goto err_phy_exit;
+ }
+
+ return 0;
+
+err_phy_exit:
+ phy_exit(s32g_pp->phy);
+ return ret;
+}
+
+static int deinit_pcie_phy(struct s32g_pcie *s32g_pp)
+{
+ struct dw_pcie *pcie = &s32g_pp->pcie;
+ struct device *dev = pcie->dev;
+ int ret;
+
+ if (s32g_pp->phy) {
+ ret = phy_power_off(s32g_pp->phy);
+ if (ret) {
+ dev_err(dev, "Failed to power off serdes PHY\n");
+ return ret;
+ }
+
+ ret = phy_exit(s32g_pp->phy);
+ if (ret) {
+ dev_err(dev, "Failed to exit serdes PHY\n");
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int wait_phy_data_link(struct s32g_pcie *s32g_pp)
+{
+ bool has_link;
+ int ret;
+
+ ret = read_poll_timeout(has_data_phy_link, has_link, has_link,
+ PCIE_LINK_WAIT_US, PCIE_LINK_TIMEOUT_US, 0, s32g_pp);
+ if (ret)
+ dev_info(s32g_pp->pcie.dev, "Failed to stabilize PHY link\n");
+
+ return ret;
+}
+
+static void s32g_pcie_downstream_dev_to_D0(struct s32g_pcie *s32g_pp)
+{
+ struct dw_pcie *pcie = &s32g_pp->pcie;
+ struct dw_pcie_rp *pp = &pcie->pp;
+ struct pci_bus *root_bus = NULL;
+ struct pci_dev *pdev;
+
+ /* Check if we did manage to initialize the host */
+ if (!pp->bridge || !pp->bridge->bus)
+ return;
+
+ /*
+ * link doesn't go into L2 state with some of the EndPoints
+ * if they are not in D0 state. So, we need to make sure that immediate
+ * downstream devices are in D0 state before sending PME_TurnOff to put
+ * link into L2 state.
+ */
+
+ root_bus = s32g_get_child_downstream_bus(pp->bridge->bus);
+ if (IS_ERR(root_bus)) {
+ dev_err(pcie->dev, "Failed to find downstream devices\n");
+ return;
+ }
+
+ list_for_each_entry(pdev, &root_bus->devices, bus_list) {
+ if (PCI_SLOT(pdev->devfn) == 0) {
+ if (pci_set_power_state(pdev, PCI_D0))
+ dev_err(pcie->dev,
+ "Failed to transition %s to D0 state\n",
+ dev_name(&pdev->dev));
+ }
+ }
+}
+
+static u64 s32g_get_coherency_boundary(struct device *dev)
+{
+ struct device_node *np;
+ struct resource res;
+
+ np = of_find_node_by_type(NULL, "memory");
+
+ if (of_address_to_resource(np, 0, &res)) {
+ dev_warn(dev, "Fail to get coherency boundary\n");
+ return 0;
+ }
+
+ return res.start;
+}
+
+static int s32g_pcie_init_common(struct platform_device *pdev,
+ struct s32g_pcie *s32g_pp,
+ const struct s32g_pcie_data *data)
+{
+ struct device *dev = &pdev->dev;
+ struct dw_pcie *pcie = &s32g_pp->pcie;
+ struct phy *phy;
+
+ pcie->dev = dev;
+ pcie->ops = &s32g_pcie_ops;
+
+ s32g_pp->mode = data->mode;
+
+ platform_set_drvdata(pdev, s32g_pp);
+
+ phy = devm_phy_get(dev, NULL);
+ if (IS_ERR(phy))
+ return dev_err_probe(dev, PTR_ERR(phy),
+ "Failed to get serdes PHY\n");
+ s32g_pp->phy = phy;
+
+ s32g_pcie_set_phy_mode(s32g_pp);
+
+ pcie->dbi_base = devm_platform_ioremap_resource_byname(pdev, "dbi");
+ if (IS_ERR(pcie->dbi_base))
+ return PTR_ERR(pcie->dbi_base);
+
+ pcie->dbi_base2 = devm_platform_ioremap_resource_byname(pdev, "dbi2");
+ if (IS_ERR(pcie->dbi_base2))
+ return PTR_ERR(pcie->dbi_base2);
+
+ pcie->atu_base = devm_platform_ioremap_resource_byname(pdev, "atu");
+ if (IS_ERR(pcie->atu_base))
+ return PTR_ERR(pcie->atu_base);
+
+ s32g_pp->ctrl_base = devm_platform_ioremap_resource_byname(pdev, "ctrl");
+ if (IS_ERR(s32g_pp->ctrl_base))
+ return PTR_ERR(s32g_pp->ctrl_base);
+
+ s32g_pp->coherency_base = s32g_get_coherency_boundary(dev);
+
+ return 0;
+}
+
+static int s32g_pcie_init_host(struct platform_device *pdev,
+ struct s32g_pcie *s32g_pp)
+{
+ struct dw_pcie *pcie = &s32g_pp->pcie;
+ struct dw_pcie_rp *pp = &pcie->pp;
+
+ /* Set dw host ops */
+ pp->ops = &s32g_pcie_host_ops;
+
+ return 0;
+}
+
+static int s32g_pcie_config_common(struct device *dev,
+ struct s32g_pcie *s32g_pp)
+{
+ int ret = 0;
+
+ s32g_pcie_disable_ltssm(s32g_pp);
+
+ ret = init_pcie_phy(s32g_pp);
+ if (ret)
+ return ret;
+
+ ret = init_pcie(s32g_pp);
+ if (ret)
+ goto err_deinit_phy;
+
+ return 0;
+
+err_deinit_phy:
+ deinit_pcie_phy(s32g_pp);
+ return ret;
+}
+
+static void s32g_pcie_deconfig_common(struct s32g_pcie *s32g_pp)
+{
+ s32g_pcie_disable_ltssm(s32g_pp);
+ deinit_pcie_phy(s32g_pp);
+}
+
+static int s32g_pcie_config_host(struct device *dev,
+ struct s32g_pcie *s32g_pp)
+{
+ struct dw_pcie *pcie = &s32g_pp->pcie;
+ struct dw_pcie_rp *pp = &pcie->pp;
+ int ret = 0;
+
+ ret = wait_phy_data_link(s32g_pp);
+ if ((ret) && (!phy_validate(s32g_pp->phy, PHY_MODE_PCIE, 0, NULL))) {
+ dev_err(pcie->dev, "Failed to get link up with EP connected\n");
+ goto err_host_deinit;
+ }
+
+ ret = dw_pcie_host_init(pp);
+ if (ret) {
+ dev_err(dev, "Failed to initialize host\n");
+ goto err_host_deinit;
+ }
+
+ return 0;
+
+err_host_deinit:
+ dw_pcie_host_deinit(pp);
+ return ret;
+}
+
+static int s32g_pcie_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct s32g_pcie *s32g_pp;
+ const struct s32g_pcie_data *data;
+ int ret = 0;
+
+ data = of_device_get_match_data(dev);
+ if (!data)
+ return -EINVAL;
+
+ s32g_pp = devm_kzalloc(dev, sizeof(*s32g_pp), GFP_KERNEL);
+ if (!s32g_pp)
+ return -ENOMEM;
+
+ ret = s32g_pcie_init_common(pdev, s32g_pp, data);
+ if (ret)
+ return ret;
+
+ ret = s32g_pcie_init_host(pdev, s32g_pp);
+ if (ret)
+ return ret;
+
+ pm_runtime_enable(dev);
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0)
+ goto err_pm_runtime_put;
+
+ ret = s32g_pcie_config_common(dev, s32g_pp);
+ if (ret)
+ goto err_pm_runtime_put;
+
+ ret = s32g_pcie_config_host(dev, s32g_pp);
+ if (ret)
+ goto err_deinit_controller;
+
+ return 0;
+
+err_deinit_controller:
+ s32g_pcie_deconfig_common(s32g_pp);
+err_pm_runtime_put:
+ pm_runtime_put(dev);
+ pm_runtime_disable(dev);
+
+ return ret;
+}
+
+static void s32g_pcie_shutdown(struct platform_device *pdev)
+{
+ pm_runtime_put(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+}
+
+static int s32g_pcie_suspend(struct device *dev)
+{
+ struct s32g_pcie *s32g_pp = dev_get_drvdata(dev);
+ struct dw_pcie *pcie = &s32g_pp->pcie;
+ struct dw_pcie_rp *pp = &pcie->pp;
+ struct pci_bus *bus, *root_bus;
+
+ /* Save MSI interrupt vector */
+ s32g_pp->msi_ctrl_int = dw_pcie_readl_dbi(pcie,
+ PCIE_MSI_INTR0_ENABLE);
+
+ if (is_s32g_pcie_rc(s32g_pp->mode)) {
+ s32g_pcie_downstream_dev_to_D0(s32g_pp);
+
+ bus = pp->bridge->bus;
+ root_bus = s32g_get_child_downstream_bus(bus);
+ if (!IS_ERR(root_bus))
+ pci_walk_bus(root_bus, pci_dev_set_disconnected, NULL);
+
+ pci_stop_root_bus(bus);
+ pci_remove_root_bus(bus);
+ }
+
+ s32g_pcie_deconfig_common(s32g_pp);
+
+ return 0;
+}
+
+static int s32g_pcie_resume(struct device *dev)
+{
+ struct s32g_pcie *s32g_pp = dev_get_drvdata(dev);
+ struct dw_pcie *pcie = &s32g_pp->pcie;
+ struct dw_pcie_rp *pp = &pcie->pp;
+ int ret = 0;
+
+ ret = s32g_pcie_config_common(dev, s32g_pp);
+ if (ret < 0)
+ return ret;
+
+ if (is_s32g_pcie_rc(s32g_pp->mode)) {
+ ret = dw_pcie_setup_rc(pp);
+ if (ret) {
+ dev_err(dev, "Failed to resume DW RC: %d\n", ret);
+ goto fail_host_init;
+ }
+
+ ret = dw_pcie_start_link(pcie);
+ if (ret) {
+ /* We do not exit with error if link up was unsuccessful
+ * EndPoint may not be connected.
+ */
+ if (dw_pcie_wait_for_link(pcie))
+ dev_warn(pcie->dev,
+ "Link Up failed, EndPoint may not be connected\n");
+
+ if (!phy_validate(s32g_pp->phy, PHY_MODE_PCIE, 0, NULL)) {
+ dev_err(dev, "Failed to get link up with EP connected\n");
+ goto fail_host_init;
+ }
+ }
+
+ ret = pci_host_probe(pp->bridge);
+ if (ret)
+ goto fail_host_init;
+ }
+
+ /* Restore MSI interrupt vector */
+ dw_pcie_writel_dbi(pcie, PCIE_MSI_INTR0_ENABLE,
+ s32g_pp->msi_ctrl_int);
+
+ return 0;
+
+fail_host_init:
+ s32g_pcie_deconfig_common(s32g_pp);
+ return ret;
+}
+
+static const struct dev_pm_ops s32g_pcie_pm_ops = {
+ SYSTEM_SLEEP_PM_OPS(s32g_pcie_suspend,
+ s32g_pcie_resume)
+};
+
+static const struct s32g_pcie_data rc_of_data = {
+ .mode = DW_PCIE_RC_TYPE,
+};
+
+static const struct of_device_id s32g_pcie_of_match[] = {
+ { .compatible = "nxp,s32g2-pcie", .data = &rc_of_data },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, s32g_pcie_of_match);
+
+static struct platform_driver s32g_pcie_driver = {
+ .driver = {
+ .name = "s32g-pcie",
+ .owner = THIS_MODULE,
+ .of_match_table = s32g_pcie_of_match,
+ .pm = pm_sleep_ptr(&s32g_pcie_pm_ops),
+ },
+ .probe = s32g_pcie_probe,
+ .shutdown = s32g_pcie_shutdown,
+};
+
+module_platform_driver(s32g_pcie_driver);
+
+MODULE_AUTHOR("Ionut Vicovan <Ionut.Vicovan@nxp.com>");
+MODULE_DESCRIPTION("NXP S32G PCIe Host controller driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/pci/controller/dwc/pci-s32g.h b/drivers/pci/controller/dwc/pci-s32g.h
new file mode 100644
index 000000000000..cdd0c635cc72
--- /dev/null
+++ b/drivers/pci/controller/dwc/pci-s32g.h
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * PCIe host controller driver for NXP S32G SoCs
+ *
+ * Copyright 2019-2025 NXP
+ */
+
+#ifndef PCIE_S32G_H
+#define PCIE_S32G_H
+
+#include <linux/types.h>
+#include <linux/pcie/nxp-s32g-pcie-phy-submode.h>
+
+#define to_s32g_from_dw_pcie(x) \
+ container_of(x, struct s32g_pcie, pcie)
+
+struct s32g_pcie_data {
+ enum dw_pcie_device_mode mode;
+};
+
+struct s32g_pcie {
+ struct dw_pcie pcie;
+
+ u32 msi_ctrl_int;
+
+ /* we have cfg in struct dw_pcie_rp and
+ * dbi in struct dw_pcie, so define only ctrl here
+ */
+ void __iomem *ctrl_base;
+ u64 coherency_base;
+
+ enum dw_pcie_device_mode mode;
+
+ enum pcie_phy_mode phy_mode;
+
+ struct phy *phy;
+};
+
+static inline
+bool is_s32g_pcie_rc(enum dw_pcie_device_mode mode)
+{
+ return mode == DW_PCIE_RC_TYPE;
+}
+
+#endif /* PCIE_S32G_H */
--
2.43.0