From f468fdca9bc04b042f8354ca411821a035b7b3be Mon Sep 17 00:00:00 2001 From: Jia Wang Date: Wed, 15 Apr 2026 15:21:17 +0800 Subject: [PATCH 1/3] riscv: add UltraRISC SoC family Kconfig support The first SoC in the UltraRISC series is UR-DP1000, containing octa UltraRISC CP100 cores. Signed-off-by: Jia Wang Signed-off-by: Linux RISC-V bot --- arch/riscv/Kconfig.socs | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/riscv/Kconfig.socs b/arch/riscv/Kconfig.socs index d621b85dd63bd0..0b4d06a7b4bf43 100644 --- a/arch/riscv/Kconfig.socs +++ b/arch/riscv/Kconfig.socs @@ -84,6 +84,12 @@ config ARCH_THEAD help This enables support for the RISC-V based T-HEAD SoCs. +config ARCH_ULTRARISC + bool "UltraRISC RISC-V SoCs" + help + This enables support for UltraRISC SoC platform hardware, + including boards based on the UR-DP1000. + config ARCH_VIRT bool "QEMU Virt Machine" select POWER_RESET From d111ae87b234220306ceff518b1cbb14d13850f4 Mon Sep 17 00:00:00 2001 From: Jia Wang Date: Wed, 15 Apr 2026 15:21:18 +0800 Subject: [PATCH 2/3] dt-bindings: PCI: Add UltraRISC DP1000 PCIe controller Add UltraRISC DP1000 SoC PCIe controller devicetree bindings. Signed-off-by: Jia Wang Signed-off-by: Linux RISC-V bot --- .../bindings/pci/ultrarisc,dp1000-pcie.yaml | 93 +++++++++++++++++++ MAINTAINERS | 7 ++ 2 files changed, 100 insertions(+) create mode 100644 Documentation/devicetree/bindings/pci/ultrarisc,dp1000-pcie.yaml diff --git a/Documentation/devicetree/bindings/pci/ultrarisc,dp1000-pcie.yaml b/Documentation/devicetree/bindings/pci/ultrarisc,dp1000-pcie.yaml new file mode 100644 index 00000000000000..512b935bf5d1e9 --- /dev/null +++ b/Documentation/devicetree/bindings/pci/ultrarisc,dp1000-pcie.yaml @@ -0,0 +1,93 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/pci/ultrarisc,dp1000-pcie.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: UltraRISC DP1000 PCIe Host Controller + +description: + UltraRISC DP1000 SoC PCIe host controller is based on the DesignWare PCIe IP. + +maintainers: + - Xincheng Zhang + - Jia Wang + +allOf: + - $ref: /schemas/pci/snps,dw-pcie.yaml# + +properties: + compatible: + const: ultrarisc,dp1000-pcie + + reg: + items: + - description: Data Bus Interface (DBI) registers. + - description: PCIe configuration space region. + + reg-names: + items: + - const: dbi + - const: config + + num-lanes: + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [4, 16] + description: Number of lanes to use. + + interrupts: + items: + - description: MSI interrupt + - description: Legacy INTA interrupt + - description: Legacy INTB interrupt + - description: Legacy INTC interrupt + - description: Legacy INTD interrupt + + interrupt-names: + items: + - const: msi + - const: inta + - const: intb + - const: intc + - const: intd + +required: + - compatible + - reg + - reg-names + - interrupts + - interrupt-names + +unevaluatedProperties: false + +examples: + - | + soc { + #address-cells = <2>; + #size-cells = <2>; + + pcie@21000000 { + compatible = "ultrarisc,dp1000-pcie"; + reg = <0x0 0x21000000 0x0 0x01000000>, + <0x0 0x4fff0000 0x0 0x00010000>; + reg-names = "dbi", "config"; + ranges = <0x81000000 0x0 0x4fbf0000 0x0 0x4fbf0000 0x0 0x00400000>, + <0x82000000 0x0 0x40000000 0x0 0x40000000 0x0 0x0fbf0000>, + <0xc3000000 0x40 0x00000000 0x40 0x00000000 0xd 0x00000000>; + #address-cells = <3>; + #size-cells = <2>; + #interrupt-cells = <1>; + device_type = "pci"; + dma-coherent; + bus-range = <0x0 0xff>; + num-lanes = <16>; + interrupt-parent = <&plic>; + interrupts = <43>, <44>, <45>, <46>, <47>; + interrupt-names = "msi", "inta", "intb", "intc", "intd"; + interrupt-map-mask = <0x0 0x0 0x0 0x7>; + interrupt-map = <0x0 0x0 0x0 0x1 &plic 44>, + <0x0 0x0 0x0 0x2 &plic 45>, + <0x0 0x0 0x0 0x3 &plic 46>, + <0x0 0x0 0x0 0x4 &plic 47>; + }; + }; diff --git a/MAINTAINERS b/MAINTAINERS index 7d10988cbc62b7..c1128ad3257136 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -20573,6 +20573,13 @@ S: Maintained F: Documentation/devicetree/bindings/pci/starfive,jh7110-pcie.yaml F: drivers/pci/controller/plda/pcie-starfive.c +PCIE DRIVER FOR ULTRARISC DP1000 +M: Xincheng Zhang +M: Jia Wang +L: linux-pci@vger.kernel.org +S: Maintained +F: Documentation/devicetree/bindings/pci/ultrarisc,dp1000-pcie.yaml + PCIE ENDPOINT DRIVER FOR QUALCOMM M: Manivannan Sadhasivam L: linux-pci@vger.kernel.org From 8bbd3904681945725325a0c8caed4c078c33461a Mon Sep 17 00:00:00 2001 From: Xincheng Zhang Date: Wed, 15 Apr 2026 15:21:19 +0800 Subject: [PATCH 3/3] PCI: ultrarisc: Add UltraRISC DP1000 PCIe Root Complex driver Add DP1000 SoC PCIe Root Complex driver. Signed-off-by: Xincheng Zhang Signed-off-by: Jia Wang Signed-off-by: Linux RISC-V bot --- MAINTAINERS | 1 + drivers/pci/controller/dwc/Kconfig | 12 ++ drivers/pci/controller/dwc/Makefile | 1 + drivers/pci/controller/dwc/pcie-designware.h | 22 +++ drivers/pci/controller/dwc/pcie-ultrarisc.c | 186 +++++++++++++++++++ 5 files changed, 222 insertions(+) create mode 100644 drivers/pci/controller/dwc/pcie-ultrarisc.c diff --git a/MAINTAINERS b/MAINTAINERS index c1128ad3257136..7adfabbb97c8a8 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -20579,6 +20579,7 @@ M: Jia Wang L: linux-pci@vger.kernel.org S: Maintained F: Documentation/devicetree/bindings/pci/ultrarisc,dp1000-pcie.yaml +F: drivers/pci/controller/dwc/pcie-ultrarisc.c PCIE ENDPOINT DRIVER FOR QUALCOMM M: Manivannan Sadhasivam diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig index d0aa031397fab1..06f7d98259cd52 100644 --- a/drivers/pci/controller/dwc/Kconfig +++ b/drivers/pci/controller/dwc/Kconfig @@ -548,4 +548,16 @@ config PCIE_VISCONTI_HOST Say Y here if you want PCIe controller support on Toshiba Visconti SoC. This driver supports TMPV7708 SoC. +config PCIE_ULTRARISC + tristate "UltraRISC PCIe host controller" + depends on ARCH_ULTRARISC || COMPILE_TEST + select PCIE_DW_HOST + select PCI_MSI + default y if ARCH_ULTRARISC + help + Enables support for the PCIe controller in the UltraRISC SoC. + This driver supports UR-DP1000 SoC. + By default, this symbol is enabled when ARCH_ULTRARISC is active, + requiring no further configuration on that platform. + endmenu diff --git a/drivers/pci/controller/dwc/Makefile b/drivers/pci/controller/dwc/Makefile index 67ba59c02038c8..884c46b78e01fb 100644 --- a/drivers/pci/controller/dwc/Makefile +++ b/drivers/pci/controller/dwc/Makefile @@ -38,6 +38,7 @@ obj-$(CONFIG_PCIE_RCAR_GEN4) += pcie-rcar-gen4.o obj-$(CONFIG_PCIE_SPACEMIT_K1) += pcie-spacemit-k1.o obj-$(CONFIG_PCIE_STM32_HOST) += pcie-stm32.o obj-$(CONFIG_PCIE_STM32_EP) += pcie-stm32-ep.o +obj-$(CONFIG_PCIE_ULTRARISC) += pcie-ultrarisc.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-designware.h b/drivers/pci/controller/dwc/pcie-designware.h index ae6389dd9caa5c..88dcb0e7943a6c 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -69,6 +69,8 @@ /* Synopsys-specific PCIe configuration registers */ #define PCIE_PORT_FORCE 0x708 +/* Bit[7:0] LINK_NUM: Link Number. Not used for endpoint */ +#define PORT_LINK_NUM_MASK GENMASK(7, 0) #define PORT_FORCE_DO_DESKEW_FOR_SRIS BIT(23) #define PCIE_PORT_AFR 0x70C @@ -96,6 +98,26 @@ #define PCIE_PORT_LANE_SKEW 0x714 #define PORT_LANE_SKEW_INSERT_MASK GENMASK(23, 0) +/* + * PCIE_TIMER_CTRL_MAX_FUNC_NUM: Timer Control and Max Function Number + * Register. + * This register holds the ack frequency, latency, replay, fast link + * scaling timers, and max function number values. + * Bit[30:29] FAST_LINK_SCALING_FACTOR: Fast Link Timer Scaling Factor. + * 0x0 (SF_1024):Scaling Factor is 1024 (1ms is 1us). + * When the LTSSM is in Config or L12 Entry State, 1ms + * timer is 2us, 2ms timer is 4us and 3ms timer is 6us. + * 0x1 (SF_256): Scaling Factor is 256 (1ms is 4us) + * 0x2 (SF_64): Scaling Factor is 64 (1ms is 16us) + * 0x3 (SF_16): Scaling Factor is 16 (1ms is 64us) + */ +#define PCIE_TIMER_CTRL_MAX_FUNC_NUM 0x718 +#define PORT_FLT_SF_MASK GENMASK(30, 29) +#define PORT_FLT_SF_VAL_1024 0x0 +#define PORT_FLT_SF_VAL_256 0x1 +#define PORT_FLT_SF_VAL_64 0x2 +#define PORT_FLT_SF_VAL_16 0x3 + #define PCIE_PORT_DEBUG0 0x728 #define PORT_LOGIC_LTSSM_STATE_MASK 0x3f #define PORT_LOGIC_LTSSM_STATE_L0 0x11 diff --git a/drivers/pci/controller/dwc/pcie-ultrarisc.c b/drivers/pci/controller/dwc/pcie-ultrarisc.c new file mode 100644 index 00000000000000..7094ee8c532f86 --- /dev/null +++ b/drivers/pci/controller/dwc/pcie-ultrarisc.c @@ -0,0 +1,186 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * DWC PCIe RC driver for UltraRISC DP1000 SoC + * + * Copyright (C) 2026 UltraRISC Technology (Shanghai) Co., Ltd. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "pcie-designware.h" + +#define PCIE_CUS_CORE 0x400000 + +#define LTSSM_ENABLE BIT(7) +#define FAST_LINK_MODE BIT(12) +#define HOLD_PHY_RST BIT(14) +#define L1SUB_DISABLE BIT(15) + +struct ultrarisc_pcie { + struct dw_pcie *pci; +}; + +static struct pci_ops ultrarisc_pci_ops = { + .map_bus = dw_pcie_own_conf_map_bus, + .read = pci_generic_config_read32, + .write = pci_generic_config_write32, +}; + +static int ultrarisc_pcie_host_init(struct dw_pcie_rp *pp) +{ + struct pci_host_bridge *bridge = pp->bridge; + + bridge->ops = &ultrarisc_pci_ops; + + return 0; +} + +static void ultrarisc_pcie_pme_turn_off(struct dw_pcie_rp *pp) +{ + /* + * DP1000 does not support sending PME_Turn_Off from the RC. + * Keep this callback empty to skip the generic MSG TLP path. + */ +} + +static const struct dw_pcie_host_ops ultrarisc_pcie_host_ops = { + .init = ultrarisc_pcie_host_init, + .pme_turn_off = ultrarisc_pcie_pme_turn_off, +}; + +static int ultrarisc_pcie_start_link(struct dw_pcie *pci) +{ + u32 val; + u8 cap_exp; + + val = dw_pcie_readl_dbi(pci, PCIE_CUS_CORE); + val &= ~FAST_LINK_MODE; + dw_pcie_writel_dbi(pci, PCIE_CUS_CORE, val); + + val = dw_pcie_readl_dbi(pci, PCIE_TIMER_CTRL_MAX_FUNC_NUM); + FIELD_MODIFY(PORT_FLT_SF_MASK, &val, PORT_FLT_SF_VAL_64); + dw_pcie_writel_dbi(pci, PCIE_TIMER_CTRL_MAX_FUNC_NUM, val); + + cap_exp = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP); + val = dw_pcie_readl_dbi(pci, cap_exp + PCI_EXP_LNKCTL2); + FIELD_MODIFY(PCI_EXP_LNKCTL2_TLS, &val, PCI_EXP_LNKCTL2_TLS_16_0GT); + dw_pcie_writel_dbi(pci, cap_exp + PCI_EXP_LNKCTL2, val); + + val = dw_pcie_readl_dbi(pci, PCIE_PORT_FORCE); + FIELD_MODIFY(PORT_LINK_NUM_MASK, &val, 0); + dw_pcie_writel_dbi(pci, PCIE_PORT_FORCE, val); + + val = dw_pcie_readl_dbi(pci, cap_exp + PCI_EXP_DEVCTL2); + FIELD_MODIFY(PCI_EXP_DEVCTL2_COMP_TIMEOUT, &val, 0x6); + dw_pcie_writel_dbi(pci, cap_exp + PCI_EXP_DEVCTL2, val); + + val = dw_pcie_readl_dbi(pci, PCIE_CUS_CORE); + val &= ~(HOLD_PHY_RST | L1SUB_DISABLE); + val |= LTSSM_ENABLE; + dw_pcie_writel_dbi(pci, PCIE_CUS_CORE, val); + + return 0; +} + +static const struct dw_pcie_ops dw_pcie_ops = { + .start_link = ultrarisc_pcie_start_link, +}; + +static int ultrarisc_pcie_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct ultrarisc_pcie *pcie; + struct dw_pcie *pci; + struct dw_pcie_rp *pp; + int ret; + + pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL); + if (!pcie) + return -ENOMEM; + + pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL); + if (!pci) + return -ENOMEM; + + pci->dev = dev; + pci->ops = &dw_pcie_ops; + + /* Set a default value suitable for at most 16 in and 16 out windows */ + pci->atu_size = SZ_8K; + pci->max_link_speed = 4; + pcie->pci = pci; + + pp = &pci->pp; + + platform_set_drvdata(pdev, pcie); + + pp->irq = platform_get_irq(pdev, 1); + if (pp->irq < 0) + return pp->irq; + + pp->num_vectors = MAX_MSI_IRQS; + /* No L2/L3 Ready indication is available on this platform. */ + pp->skip_l23_ready = true; + pp->ops = &ultrarisc_pcie_host_ops; + + ret = dw_pcie_host_init(pp); + if (ret) { + dev_err(dev, "Failed to initialize host\n"); + return ret; + } + + return 0; +} + +static int ultrarisc_pcie_suspend_noirq(struct device *dev) +{ + struct ultrarisc_pcie *pcie = dev_get_drvdata(dev); + struct dw_pcie *pci = pcie->pci; + + return dw_pcie_suspend_noirq(pci); +} + +static int ultrarisc_pcie_resume_noirq(struct device *dev) +{ + struct ultrarisc_pcie *pcie = dev_get_drvdata(dev); + struct dw_pcie *pci = pcie->pci; + + return dw_pcie_resume_noirq(pci); +} + +static const struct dev_pm_ops ultrarisc_pcie_pm_ops = { + NOIRQ_SYSTEM_SLEEP_PM_OPS(ultrarisc_pcie_suspend_noirq, + ultrarisc_pcie_resume_noirq) +}; + +static const struct of_device_id ultrarisc_pcie_of_match[] = { + { + .compatible = "ultrarisc,dp1000-pcie", + }, + {}, +}; +MODULE_DEVICE_TABLE(of, ultrarisc_pcie_of_match); + +static struct platform_driver ultrarisc_pcie_driver = { + .driver = { + .name = "ultrarisc-pcie", + .of_match_table = ultrarisc_pcie_of_match, + .suppress_bind_attrs = true, + .pm = &ultrarisc_pcie_pm_ops, + }, + .probe = ultrarisc_pcie_probe, +}; +module_platform_driver(ultrarisc_pcie_driver); + +MODULE_DESCRIPTION("UltraRISC DP1000 DWC PCIe host controller"); +MODULE_LICENSE("GPL");