Add R-Car Gen4 PCIe Host support. This controller is based on
Synopsys Designware PCIe.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
---
drivers/pci/controller/dwc/Kconfig | 9 +
drivers/pci/controller/dwc/Makefile | 1 +
.../pci/controller/dwc/pcie-rcar-gen4-host.c | 235 ++++++++++++++++++
drivers/pci/controller/dwc/pcie-rcar-gen4.c | 198 +++++++++++++++
drivers/pci/controller/dwc/pcie-rcar-gen4.h | 59 +++++
5 files changed, 502 insertions(+)
create mode 100644 drivers/pci/controller/dwc/pcie-rcar-gen4-host.c
create mode 100644 drivers/pci/controller/dwc/pcie-rcar-gen4.c
create mode 100644 drivers/pci/controller/dwc/pcie-rcar-gen4.h
diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig
index 62ce3abf0f19..3ddccc9c38c5 100644
--- a/drivers/pci/controller/dwc/Kconfig
+++ b/drivers/pci/controller/dwc/Kconfig
@@ -384,4 +384,13 @@ config PCIE_FU740
Say Y here if you want PCIe controller support for the SiFive
FU740.
+config PCIE_RCAR_GEN4
+ bool "Renesas R-Car Gen4 PCIe Host controller"
+ depends on ARCH_RENESAS || COMPILE_TEST
+ depends on PCI_MSI_IRQ_DOMAIN
+ select PCIE_DW_HOST
+ help
+ Say Y here if you want PCIe host controller support on R-Car Gen4 SoCs.
+ This uses the DesignWare core.
+
endmenu
diff --git a/drivers/pci/controller/dwc/Makefile b/drivers/pci/controller/dwc/Makefile
index 8ba7b67f5e50..b3f285e685f9 100644
--- a/drivers/pci/controller/dwc/Makefile
+++ b/drivers/pci/controller/dwc/Makefile
@@ -25,6 +25,7 @@ obj-$(CONFIG_PCIE_TEGRA194) += pcie-tegra194.o
obj-$(CONFIG_PCIE_UNIPHIER) += pcie-uniphier.o
obj-$(CONFIG_PCIE_UNIPHIER_EP) += pcie-uniphier-ep.o
obj-$(CONFIG_PCIE_VISCONTI_HOST) += pcie-visconti.o
+obj-$(CONFIG_PCIE_RCAR_GEN4) += pcie-rcar-gen4.o pcie-rcar-gen4-host.o
# The following drivers are for devices that use the generic ACPI
# pci_root.c driver but don't support standard ECAM config access.
diff --git a/drivers/pci/controller/dwc/pcie-rcar-gen4-host.c b/drivers/pci/controller/dwc/pcie-rcar-gen4-host.c
new file mode 100644
index 000000000000..788cd0206528
--- /dev/null
+++ b/drivers/pci/controller/dwc/pcie-rcar-gen4-host.c
@@ -0,0 +1,235 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCIe host controller driver for Renesas R-Car Gen4 Series SoCs
+ * Copyright (C) 2022 Renesas Electronics Corporation
+ */
+
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+
+#include "pcie-rcar-gen4.h"
+#include "pcie-designware.h"
+
+/* ASPM L1 PM Substates */
+#define L1PSCAP(x) (0x01bc + (x))
+
+static int rcar_gen4_pcie_host_init(struct pcie_port *pp)
+{
+ struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+ int ret;
+
+ dw_pcie_setup_rc(pp);
+
+ dw_pcie_dbi_ro_wr_en(pci);
+
+ /* Set Max Link Width */
+ rcar_gen4_pcie_set_max_link_width(pci, pci->num_lanes);
+
+ dw_pcie_dbi_ro_wr_dis(pci);
+
+ if (!dw_pcie_link_up(pci)) {
+ ret = pci->ops->start_link(pci);
+ if (ret)
+ return ret;
+ }
+
+ /* Ignore errors, the link may come up later */
+ if (dw_pcie_wait_for_link(pci))
+ dev_info(pci->dev, "PCIe link down\n");
+
+ return 0;
+}
+
+static const struct dw_pcie_host_ops rcar_gen4_pcie_host_ops = {
+ .host_init = rcar_gen4_pcie_host_init,
+};
+
+static int rcar_gen4_add_pcie_port(struct rcar_gen4_pcie *pcie,
+ struct platform_device *pdev)
+{
+ struct dw_pcie *pci = pcie->pci;
+ struct pcie_port *pp = &pci->pp;
+ u32 val;
+ int ret;
+
+ if (IS_ENABLED(CONFIG_PCI_MSI)) {
+ pp->msi_irq = platform_get_irq_byname(pdev, "msi");
+ if (pp->msi_irq < 0)
+ return pp->msi_irq;
+
+ /* Enable MSI interrupt signal */
+ val = rcar_gen4_pcie_readl(pcie, PCIEINTSTS0EN);
+ val |= MSI_CTRL_INT;
+ rcar_gen4_pcie_writel(pcie, PCIEINTSTS0EN, val);
+ }
+
+ pp->ops = &rcar_gen4_pcie_host_ops;
+
+ ret = dw_pcie_host_init(pp);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to initialize host\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static void rcar_gen4_remove_pcie_port(struct rcar_gen4_pcie *pcie)
+{
+ dw_pcie_host_deinit(&pcie->pci->pp);
+}
+
+static void rcar_gen4_pcie_init_rc(struct rcar_gen4_pcie *pcie, u32 num_lanes)
+{
+ struct dw_pcie *pci = pcie->pci;
+ int val;
+
+ /* Device type selection - Root Complex */
+ val = rcar_gen4_pcie_readl(pcie, PCIEMSR0);
+ val |= DEVICE_TYPE_RC;
+ if (num_lanes < 4)
+ val |= BIFUR_MOD_SET_ON;
+ rcar_gen4_pcie_writel(pcie, PCIEMSR0, val);
+
+ dw_pcie_dbi_ro_wr_en(pci);
+
+ /* Enable L1 Substates */
+ val = dw_pcie_readl_dbi(pci, L1PSCAP(PCI_L1SS_CTL1));
+ val &= ~PCI_L1SS_CTL1_L1SS_MASK;
+ val |= PCI_L1SS_CTL1_PCIPM_L1_2 | PCI_L1SS_CTL1_PCIPM_L1_1 |
+ PCI_L1SS_CTL1_ASPM_L1_2 | PCI_L1SS_CTL1_ASPM_L1_1;
+ dw_pcie_writel_dbi(pci, L1PSCAP(PCI_L1SS_CTL1), val);
+
+ /* Disable BARs */
+ dw_pcie_writel_dbi(pci, SHADOW_REG(BAR0MASKF), 0x0);
+ dw_pcie_writel_dbi(pci, SHADOW_REG(BAR1MASKF), 0x0);
+
+ /* Set Root Control */
+ val = dw_pcie_readl_dbi(pci, EXPCAP(PCI_EXP_RTCTL));
+ val |= PCI_EXP_RTCTL_SECEE | PCI_EXP_RTCTL_SENFEE |
+ PCI_EXP_RTCTL_SEFEE | PCI_EXP_RTCTL_PMEIE |
+ PCI_EXP_RTCTL_CRSSVE;
+ dw_pcie_writel_dbi(pci, EXPCAP(PCI_EXP_RTCTL), val);
+
+ /* Set Interrupt Disable, SERR# Enable, Parity Error Response */
+ val = dw_pcie_readl_dbi(pci, PCI_COMMAND);
+ val |= PCI_COMMAND_PARITY | PCI_COMMAND_SERR |
+ PCI_COMMAND_INTX_DISABLE;
+ dw_pcie_writel_dbi(pci, PCI_COMMAND, val);
+
+ /* Enable SERR */
+ val = dw_pcie_readb_dbi(pci, PCI_BRIDGE_CONTROL);
+ val |= PCI_BRIDGE_CTL_SERR;
+ dw_pcie_writeb_dbi(pci, PCI_BRIDGE_CONTROL, val);
+
+ /* Device control */
+ val = dw_pcie_readl_dbi(pci, EXPCAP(PCI_EXP_DEVCTL));
+ val |= PCI_EXP_DEVCTL_CERE | PCI_EXP_DEVCTL_NFERE |
+ PCI_EXP_DEVCTL_FERE | PCI_EXP_DEVCTL_URRE;
+ dw_pcie_writel_dbi(pci, EXPCAP(PCI_EXP_DEVCTL), val);
+
+ dw_pcie_dbi_ro_wr_dis(pci);
+}
+
+static int rcar_gen4_pcie_get_resources(struct rcar_gen4_pcie *pcie,
+ struct platform_device *pdev)
+{
+ struct dw_pcie *pci = pcie->pci;
+ struct resource *res;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
+ pci->dbi_base = devm_pci_remap_cfg_resource(pci->dev, res);
+ if (IS_ERR(pci->dbi_base))
+ return PTR_ERR(pci->dbi_base);
+
+ /* Renesas-specific registers */
+ pcie->base = devm_platform_ioremap_resource_byname(pdev, "app");
+ if (IS_ERR(pcie->base))
+ return PTR_ERR(pcie->base);
+
+ return rcar_gen4_pcie_devm_clk_and_reset_get(pcie, pci->dev);
+}
+
+static int rcar_gen4_pcie_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct rcar_gen4_pcie *pcie;
+ struct device_node *np = dev->of_node;
+ int err;
+ u32 num_lanes;
+
+ pcie = rcar_gen4_pcie_devm_alloc(dev);
+ if (!pcie)
+ return -ENOMEM;
+
+ err = rcar_gen4_pcie_pm_runtime_enable(dev);
+ if (err < 0) {
+ dev_err(dev, "pm_runtime_get_sync failed\n");
+ return err;
+ }
+
+ err = rcar_gen4_pcie_get_resources(pcie, pdev);
+ if (err < 0) {
+ dev_err(dev, "failed to request resource: %d\n", err);
+ goto err_pm_put;
+ }
+
+ err = of_property_read_u32(np, "num-lanes", &num_lanes);
+ if (err < 0) {
+ dev_err(dev, "num-lanes not found %d\n", err);
+ goto err_pm_put;
+ }
+
+ platform_set_drvdata(pdev, pcie);
+
+ err = rcar_gen4_pcie_prepare(pcie);
+ if (err < 0)
+ goto err_pm_put;
+ rcar_gen4_pcie_init_rc(pcie, num_lanes);
+
+ err = rcar_gen4_add_pcie_port(pcie, pdev);
+ if (err < 0)
+ goto err_host_disable;
+
+ return 0;
+
+err_host_disable:
+ rcar_gen4_pcie_unprepare(pcie);
+
+err_pm_put:
+ rcar_gen4_pcie_pm_runtime_disable(dev);
+
+ return err;
+}
+
+static int rcar_gen4_pcie_remove(struct platform_device *pdev)
+{
+ struct rcar_gen4_pcie *pcie = platform_get_drvdata(pdev);
+
+ rcar_gen4_remove_pcie_port(pcie);
+ rcar_gen4_pcie_unprepare(pcie);
+ rcar_gen4_pcie_pm_runtime_disable(&pdev->dev);
+
+ return 0;
+}
+
+static const struct of_device_id rcar_gen4_pcie_of_match[] = {
+ { .compatible = "renesas,rcar-gen4-pcie", },
+ {},
+};
+
+static struct platform_driver rcar_gen4_pcie_driver = {
+ .driver = {
+ .name = "pcie-rcar-gen4",
+ .of_match_table = rcar_gen4_pcie_of_match,
+ },
+ .probe = rcar_gen4_pcie_probe,
+ .remove = rcar_gen4_pcie_remove,
+};
+builtin_platform_driver(rcar_gen4_pcie_driver);
+
+MODULE_DESCRIPTION("Renesas R-Car Gen4 PCIe host controller driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/pci/controller/dwc/pcie-rcar-gen4.c b/drivers/pci/controller/dwc/pcie-rcar-gen4.c
new file mode 100644
index 000000000000..48c3fc0b5e67
--- /dev/null
+++ b/drivers/pci/controller/dwc/pcie-rcar-gen4.c
@@ -0,0 +1,198 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCIe host/endpoint controller driver for Renesas R-Car Gen4 Series SoCs
+ * Copyright (C) 2022 Renesas Electronics Corporation
+ */
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/of_device.h>
+#include <linux/pci.h>
+#include <linux/pm_runtime.h>
+#include <linux/reset.h>
+
+#include "pcie-rcar-gen4.h"
+#include "pcie-designware.h"
+
+/* Link Capabilities - Maximum Link Width */
+#define PCI_EXP_LNKCAP_MLW_X1 BIT(4)
+#define PCI_EXP_LNKCAP_MLW_X2 BIT(5)
+#define PCI_EXP_LNKCAP_MLW_X4 BIT(6)
+
+/* ASPM L1 PM Substates */
+#define L1PSCAP(x) (0x01bc + (x))
+
+/* Renesas-specific */
+#define PCIEMSR0 0x0000
+#define BIFUR_MOD_SET_ON (0x1 << 0)
+#define DEVICE_TYPE_RC (0x4 << 2)
+
+#define PCIERSTCTRL1 0x0014
+#define APP_HOLD_PHY_RST BIT(16)
+#define APP_LTSSM_ENABLE BIT(0)
+
+#define DWC_VERSION 0x520a
+
+#define to_rcar_gen4_pcie(x) dev_get_drvdata((x)->dev)
+
+u32 rcar_gen4_pcie_readl(struct rcar_gen4_pcie *pcie, u32 reg)
+{
+ return readl(pcie->base + reg);
+}
+
+void rcar_gen4_pcie_writel(struct rcar_gen4_pcie *pcie, u32 reg, u32 val)
+{
+ writel(val, pcie->base + reg);
+}
+
+static void rcar_gen4_pcie_ltssm_enable(struct rcar_gen4_pcie *pcie,
+ bool enable)
+{
+ u32 val;
+
+ val = rcar_gen4_pcie_readl(pcie, PCIERSTCTRL1);
+ if (enable) {
+ val |= APP_LTSSM_ENABLE;
+ val &= ~APP_HOLD_PHY_RST;
+ } else {
+ val &= ~APP_LTSSM_ENABLE;
+ val |= APP_HOLD_PHY_RST;
+ }
+ rcar_gen4_pcie_writel(pcie, PCIERSTCTRL1, val);
+}
+
+static int rcar_gen4_pcie_link_up(struct dw_pcie *pci)
+{
+ struct rcar_gen4_pcie *pcie = to_rcar_gen4_pcie(pci);
+ u32 val, mask;
+
+ val = rcar_gen4_pcie_readl(pcie, PCIEINTSTS0);
+ mask = RDLH_LINK_UP | SMLH_LINK_UP;
+
+ return (val & mask) == mask;
+}
+
+static int rcar_gen4_pcie_start_link(struct dw_pcie *pci)
+{
+ struct rcar_gen4_pcie *pcie = to_rcar_gen4_pcie(pci);
+
+ rcar_gen4_pcie_ltssm_enable(pcie, true);
+
+ return 0;
+}
+
+static void rcar_gen4_pcie_stop_link(struct dw_pcie *pci)
+{
+ struct rcar_gen4_pcie *pcie = to_rcar_gen4_pcie(pci);
+
+ rcar_gen4_pcie_ltssm_enable(pcie, false);
+}
+
+void rcar_gen4_pcie_set_max_link_width(struct dw_pcie *pci, int num_lanes)
+{
+ u32 val = dw_pcie_readl_dbi(pci, EXPCAP(PCI_EXP_LNKCAP));
+
+ val &= ~PCI_EXP_LNKCAP_MLW;
+ switch (num_lanes) {
+ case 1:
+ val |= PCI_EXP_LNKCAP_MLW_X1;
+ break;
+ case 2:
+ val |= PCI_EXP_LNKCAP_MLW_X2;
+ break;
+ case 4:
+ val |= PCI_EXP_LNKCAP_MLW_X4;
+ break;
+ default:
+ dev_info(pci->dev, "invalid num-lanes %d\n", num_lanes);
+ val |= PCI_EXP_LNKCAP_MLW_X1;
+ break;
+ }
+ dw_pcie_writel_dbi(pci, EXPCAP(PCI_EXP_LNKCAP), val);
+}
+
+int rcar_gen4_pcie_prepare(struct rcar_gen4_pcie *pcie)
+{
+ struct dw_pcie *pci = pcie->pci;
+ int ret;
+
+ ret = clk_prepare_enable(pcie->bus_clk);
+ if (ret) {
+ dev_err(pci->dev, "failed to enable bus clock: %d\n", ret);
+ return ret;
+ }
+
+ ret = reset_control_deassert(pcie->rst);
+ if (ret)
+ goto err_clk_disable;
+
+ return 0;
+
+err_clk_disable:
+ clk_disable_unprepare(pcie->bus_clk);
+
+ return ret;
+}
+
+void rcar_gen4_pcie_unprepare(struct rcar_gen4_pcie *pcie)
+{
+ reset_control_assert(pcie->rst);
+ clk_disable_unprepare(pcie->bus_clk);
+}
+
+int rcar_gen4_pcie_pm_runtime_enable(struct device *dev)
+{
+ pm_runtime_enable(dev);
+ return pm_runtime_get_sync(dev);
+}
+
+void rcar_gen4_pcie_pm_runtime_disable(struct device *dev)
+{
+ pm_runtime_put(dev);
+ pm_runtime_disable(dev);
+}
+
+int rcar_gen4_pcie_devm_clk_and_reset_get(struct rcar_gen4_pcie *pcie,
+ struct device *dev)
+{
+ pcie->bus_clk = devm_clk_get(dev, "pcie_bus");
+ if (IS_ERR(pcie->bus_clk)) {
+ dev_err(dev, "cannot get pcie bus clock\n");
+ return PTR_ERR(pcie->bus_clk);
+ }
+
+ pcie->rst = devm_reset_control_get(dev, NULL);
+ if (IS_ERR(pcie->rst)) {
+ dev_err(dev, "failed to get Cold-reset\n");
+ return PTR_ERR(pcie->rst);
+ }
+
+ return 0;
+}
+
+static const struct dw_pcie_ops dw_pcie_ops = {
+ .start_link = rcar_gen4_pcie_start_link,
+ .stop_link = rcar_gen4_pcie_stop_link,
+ .link_up = rcar_gen4_pcie_link_up,
+};
+
+struct rcar_gen4_pcie *rcar_gen4_pcie_devm_alloc(struct device *dev)
+{
+ struct rcar_gen4_pcie *pcie;
+ struct dw_pcie *pci;
+
+ pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
+ if (!pcie)
+ return NULL;
+
+ pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
+ if (!pci)
+ return NULL;
+
+ pci->dev = dev;
+ pci->ops = &dw_pcie_ops;
+ pci->version = DWC_VERSION;
+ pcie->pci = pci;
+
+ return pcie;
+}
diff --git a/drivers/pci/controller/dwc/pcie-rcar-gen4.h b/drivers/pci/controller/dwc/pcie-rcar-gen4.h
new file mode 100644
index 000000000000..bd01d0ffcac9
--- /dev/null
+++ b/drivers/pci/controller/dwc/pcie-rcar-gen4.h
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * PCIe host/endpoint controller driver for Renesas R-Car Gen4 Series SoCs
+ * Copyright (C) 2022 Renesas Electronics Corporation
+ */
+
+#ifndef _PCIE_RCAR_GEN4_H_
+#define _PCIE_RCAR_GEN4_H_
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/pci.h>
+#include <linux/reset.h>
+
+#include "pcie-designware.h"
+
+/* PCI Express capability */
+#define EXPCAP(x) (0x0070 + (x))
+/* PCI Shadow offset */
+#define SHADOW_REG(x) (0x2000 + (x))
+/* BAR Mask registers */
+#define BAR0MASKF 0x0010
+#define BAR1MASKF 0x0014
+#define BAR2MASKF 0x0018
+#define BAR3MASKF 0x001c
+#define BAR4MASKF 0x0020
+#define BAR5MASKF 0x0024
+
+/* Renesas-specific */
+#define PCIEMSR0 0x0000
+#define BIFUR_MOD_SET_ON (0x1 << 0)
+#define DEVICE_TYPE_EP (0x0 << 2)
+#define DEVICE_TYPE_RC (0x4 << 2)
+
+#define PCIEINTSTS0 0x0084
+#define PCIEINTSTS0EN 0x0310
+#define MSI_CTRL_INT BIT(26)
+#define SMLH_LINK_UP BIT(7)
+#define RDLH_LINK_UP BIT(6)
+
+struct rcar_gen4_pcie {
+ struct dw_pcie *pci;
+ void __iomem *base;
+ struct clk *bus_clk;
+ struct reset_control *rst;
+};
+
+extern u32 rcar_gen4_pcie_readl(struct rcar_gen4_pcie *pcie, u32 reg);
+extern void rcar_gen4_pcie_writel(struct rcar_gen4_pcie *pcie, u32 reg, u32 val);
+extern void rcar_gen4_pcie_set_max_link_width(struct dw_pcie *pci, int num_lanes);
+extern int rcar_gen4_pcie_prepare(struct rcar_gen4_pcie *pcie);
+extern void rcar_gen4_pcie_unprepare(struct rcar_gen4_pcie *pcie);
+extern int rcar_gen4_pcie_pm_runtime_enable(struct device *dev);
+extern void rcar_gen4_pcie_pm_runtime_disable(struct device *dev);
+extern int rcar_gen4_pcie_devm_clk_and_reset_get(struct rcar_gen4_pcie *pcie,
+ struct device *dev);
+extern struct rcar_gen4_pcie *rcar_gen4_pcie_devm_alloc(struct device *dev);
+
+#endif /* _PCIE_RCAR_GEN4_H_ */
--
2.25.1
