diff options
Diffstat (limited to 'drivers/pci/controller/dwc')
25 files changed, 1282 insertions, 326 deletions
diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig index ff6b6d9e18ec..349d4657393c 100644 --- a/drivers/pci/controller/dwc/Kconfig +++ b/drivers/pci/controller/dwc/Kconfig @@ -20,6 +20,7 @@ config PCIE_DW_HOST bool select PCIE_DW select IRQ_MSI_LIB + select PCI_HOST_COMMON config PCIE_DW_EP bool @@ -298,6 +299,7 @@ config PCIE_QCOM select CRC8 select PCIE_QCOM_COMMON select PCI_HOST_COMMON + select PCI_PWRCTRL_SLOT help Say Y here to enable PCIe controller support on Qualcomm SoCs. The PCIe controller uses the DesignWare core plus Qualcomm-specific @@ -422,6 +424,30 @@ config PCIE_SPEAR13XX help Say Y here if you want PCIe support on SPEAr13XX SoCs. +config PCIE_STM32_HOST + tristate "STMicroelectronics STM32MP25 PCIe Controller (host mode)" + depends on ARCH_STM32 || COMPILE_TEST + depends on PCI_MSI + select PCIE_DW_HOST + help + Enables Root Complex (RC) support for the DesignWare core based PCIe + controller found in STM32MP25 SoC. + + This driver can also be built as a module. If so, the module + will be called pcie-stm32. + +config PCIE_STM32_EP + tristate "STMicroelectronics STM32MP25 PCIe Controller (endpoint mode)" + depends on ARCH_STM32 || COMPILE_TEST + depends on PCI_ENDPOINT + select PCIE_DW_EP + help + Enables Endpoint (EP) support for the DesignWare core based PCIe + controller found in STM32MP25 SoC. + + This driver can also be built as a module. If so, the module + will be called pcie-stm32-ep. + config PCI_DRA7XX tristate diff --git a/drivers/pci/controller/dwc/Makefile b/drivers/pci/controller/dwc/Makefile index 6919d27798d1..7ae28f3b0fb3 100644 --- a/drivers/pci/controller/dwc/Makefile +++ b/drivers/pci/controller/dwc/Makefile @@ -31,6 +31,8 @@ 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 +obj-$(CONFIG_PCIE_STM32_HOST) += pcie-stm32.o +obj-$(CONFIG_PCIE_STM32_EP) += pcie-stm32-ep.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/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c index f97f5266d196..01cfd9aeb0b8 100644 --- a/drivers/pci/controller/dwc/pci-dra7xx.c +++ b/drivers/pci/controller/dwc/pci-dra7xx.c @@ -426,7 +426,6 @@ static int dra7xx_pcie_raise_irq(struct dw_pcie_ep *ep, u8 func_no, static const struct pci_epc_features dra7xx_pcie_epc_features = { .linkup_notifier = true, .msi_capable = true, - .msix_capable = false, }; static const struct pci_epc_features* diff --git a/drivers/pci/controller/dwc/pci-exynos.c b/drivers/pci/controller/dwc/pci-exynos.c index 1f0e98d07109..0bb7d4f5d784 100644 --- a/drivers/pci/controller/dwc/pci-exynos.c +++ b/drivers/pci/controller/dwc/pci-exynos.c @@ -53,7 +53,6 @@ struct exynos_pcie { struct dw_pcie pci; - void __iomem *elbi_base; struct clk_bulk_data *clks; struct phy *phy; struct regulator_bulk_data supplies[2]; @@ -71,73 +70,78 @@ static u32 exynos_pcie_readl(void __iomem *base, u32 reg) static void exynos_pcie_sideband_dbi_w_mode(struct exynos_pcie *ep, bool on) { + struct dw_pcie *pci = &ep->pci; u32 val; - val = exynos_pcie_readl(ep->elbi_base, PCIE_ELBI_SLV_AWMISC); + val = exynos_pcie_readl(pci->elbi_base, PCIE_ELBI_SLV_AWMISC); if (on) val |= PCIE_ELBI_SLV_DBI_ENABLE; else val &= ~PCIE_ELBI_SLV_DBI_ENABLE; - exynos_pcie_writel(ep->elbi_base, val, PCIE_ELBI_SLV_AWMISC); + exynos_pcie_writel(pci->elbi_base, val, PCIE_ELBI_SLV_AWMISC); } static void exynos_pcie_sideband_dbi_r_mode(struct exynos_pcie *ep, bool on) { + struct dw_pcie *pci = &ep->pci; u32 val; - val = exynos_pcie_readl(ep->elbi_base, PCIE_ELBI_SLV_ARMISC); + val = exynos_pcie_readl(pci->elbi_base, PCIE_ELBI_SLV_ARMISC); if (on) val |= PCIE_ELBI_SLV_DBI_ENABLE; else val &= ~PCIE_ELBI_SLV_DBI_ENABLE; - exynos_pcie_writel(ep->elbi_base, val, PCIE_ELBI_SLV_ARMISC); + exynos_pcie_writel(pci->elbi_base, val, PCIE_ELBI_SLV_ARMISC); } static void exynos_pcie_assert_core_reset(struct exynos_pcie *ep) { + struct dw_pcie *pci = &ep->pci; u32 val; - val = exynos_pcie_readl(ep->elbi_base, PCIE_CORE_RESET); + val = exynos_pcie_readl(pci->elbi_base, PCIE_CORE_RESET); val &= ~PCIE_CORE_RESET_ENABLE; - exynos_pcie_writel(ep->elbi_base, val, PCIE_CORE_RESET); - exynos_pcie_writel(ep->elbi_base, 0, PCIE_STICKY_RESET); - exynos_pcie_writel(ep->elbi_base, 0, PCIE_NONSTICKY_RESET); + exynos_pcie_writel(pci->elbi_base, val, PCIE_CORE_RESET); + exynos_pcie_writel(pci->elbi_base, 0, PCIE_STICKY_RESET); + exynos_pcie_writel(pci->elbi_base, 0, PCIE_NONSTICKY_RESET); } static void exynos_pcie_deassert_core_reset(struct exynos_pcie *ep) { + struct dw_pcie *pci = &ep->pci; u32 val; - val = exynos_pcie_readl(ep->elbi_base, PCIE_CORE_RESET); + val = exynos_pcie_readl(pci->elbi_base, PCIE_CORE_RESET); val |= PCIE_CORE_RESET_ENABLE; - exynos_pcie_writel(ep->elbi_base, val, PCIE_CORE_RESET); - exynos_pcie_writel(ep->elbi_base, 1, PCIE_STICKY_RESET); - exynos_pcie_writel(ep->elbi_base, 1, PCIE_NONSTICKY_RESET); - exynos_pcie_writel(ep->elbi_base, 1, PCIE_APP_INIT_RESET); - exynos_pcie_writel(ep->elbi_base, 0, PCIE_APP_INIT_RESET); + exynos_pcie_writel(pci->elbi_base, val, PCIE_CORE_RESET); + exynos_pcie_writel(pci->elbi_base, 1, PCIE_STICKY_RESET); + exynos_pcie_writel(pci->elbi_base, 1, PCIE_NONSTICKY_RESET); + exynos_pcie_writel(pci->elbi_base, 1, PCIE_APP_INIT_RESET); + exynos_pcie_writel(pci->elbi_base, 0, PCIE_APP_INIT_RESET); } static int exynos_pcie_start_link(struct dw_pcie *pci) { - struct exynos_pcie *ep = to_exynos_pcie(pci); u32 val; - val = exynos_pcie_readl(ep->elbi_base, PCIE_SW_WAKE); + val = exynos_pcie_readl(pci->elbi_base, PCIE_SW_WAKE); val &= ~PCIE_BUS_EN; - exynos_pcie_writel(ep->elbi_base, val, PCIE_SW_WAKE); + exynos_pcie_writel(pci->elbi_base, val, PCIE_SW_WAKE); /* assert LTSSM enable */ - exynos_pcie_writel(ep->elbi_base, PCIE_ELBI_LTSSM_ENABLE, + exynos_pcie_writel(pci->elbi_base, PCIE_ELBI_LTSSM_ENABLE, PCIE_APP_LTSSM_ENABLE); return 0; } static void exynos_pcie_clear_irq_pulse(struct exynos_pcie *ep) { - u32 val = exynos_pcie_readl(ep->elbi_base, PCIE_IRQ_PULSE); + struct dw_pcie *pci = &ep->pci; - exynos_pcie_writel(ep->elbi_base, val, PCIE_IRQ_PULSE); + u32 val = exynos_pcie_readl(pci->elbi_base, PCIE_IRQ_PULSE); + + exynos_pcie_writel(pci->elbi_base, val, PCIE_IRQ_PULSE); } static irqreturn_t exynos_pcie_irq_handler(int irq, void *arg) @@ -150,12 +154,14 @@ static irqreturn_t exynos_pcie_irq_handler(int irq, void *arg) static void exynos_pcie_enable_irq_pulse(struct exynos_pcie *ep) { + struct dw_pcie *pci = &ep->pci; + u32 val = IRQ_INTA_ASSERT | IRQ_INTB_ASSERT | IRQ_INTC_ASSERT | IRQ_INTD_ASSERT; - exynos_pcie_writel(ep->elbi_base, val, PCIE_IRQ_EN_PULSE); - exynos_pcie_writel(ep->elbi_base, 0, PCIE_IRQ_EN_LEVEL); - exynos_pcie_writel(ep->elbi_base, 0, PCIE_IRQ_EN_SPECIAL); + exynos_pcie_writel(pci->elbi_base, val, PCIE_IRQ_EN_PULSE); + exynos_pcie_writel(pci->elbi_base, 0, PCIE_IRQ_EN_LEVEL); + exynos_pcie_writel(pci->elbi_base, 0, PCIE_IRQ_EN_SPECIAL); } static u32 exynos_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base, @@ -211,8 +217,7 @@ static struct pci_ops exynos_pci_ops = { static bool exynos_pcie_link_up(struct dw_pcie *pci) { - struct exynos_pcie *ep = to_exynos_pcie(pci); - u32 val = exynos_pcie_readl(ep->elbi_base, PCIE_ELBI_RDLH_LINKUP); + u32 val = exynos_pcie_readl(pci->elbi_base, PCIE_ELBI_RDLH_LINKUP); return val & PCIE_ELBI_XMLH_LINKUP; } @@ -295,11 +300,6 @@ static int exynos_pcie_probe(struct platform_device *pdev) if (IS_ERR(ep->phy)) return PTR_ERR(ep->phy); - /* External Local Bus interface (ELBI) registers */ - ep->elbi_base = devm_platform_ioremap_resource_byname(pdev, "elbi"); - if (IS_ERR(ep->elbi_base)) - return PTR_ERR(ep->elbi_base); - ret = devm_clk_bulk_get_all_enabled(dev, &ep->clks); if (ret < 0) return ret; diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c index 80e48746bbaf..4668fc9648bf 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -1387,9 +1387,7 @@ static int imx_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no, } static const struct pci_epc_features imx8m_pcie_epc_features = { - .linkup_notifier = false, .msi_capable = true, - .msix_capable = false, .bar[BAR_1] = { .type = BAR_RESERVED, }, .bar[BAR_3] = { .type = BAR_RESERVED, }, .bar[BAR_4] = { .type = BAR_FIXED, .fixed_size = SZ_256, }, @@ -1398,9 +1396,7 @@ static const struct pci_epc_features imx8m_pcie_epc_features = { }; static const struct pci_epc_features imx8q_pcie_epc_features = { - .linkup_notifier = false, .msi_capable = true, - .msix_capable = false, .bar[BAR_1] = { .type = BAR_RESERVED, }, .bar[BAR_3] = { .type = BAR_RESERVED, }, .bar[BAR_5] = { .type = BAR_RESERVED, }, @@ -1745,6 +1741,10 @@ static int imx_pcie_probe(struct platform_device *pdev) pci->max_link_speed = 1; of_property_read_u32(node, "fsl,max-link-speed", &pci->max_link_speed); + ret = devm_regulator_get_enable_optional(&pdev->dev, "vpcie3v3aux"); + if (ret < 0 && ret != -ENODEV) + return dev_err_probe(dev, ret, "failed to enable Vaux supply\n"); + imx_pcie->vpcie = devm_regulator_get_optional(&pdev->dev, "vpcie"); if (IS_ERR(imx_pcie->vpcie)) { if (PTR_ERR(imx_pcie->vpcie) != -ENODEV) diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c index 2b2632e513b5..eb00aa380722 100644 --- a/drivers/pci/controller/dwc/pci-keystone.c +++ b/drivers/pci/controller/dwc/pci-keystone.c @@ -960,7 +960,6 @@ static int ks_pcie_am654_raise_irq(struct dw_pcie_ep *ep, u8 func_no, } static const struct pci_epc_features ks_pcie_am654_epc_features = { - .linkup_notifier = false, .msi_capable = true, .msix_capable = true, .bar[BAR_0] = { .type = BAR_RESERVED, }, @@ -1201,8 +1200,8 @@ static int ks_pcie_probe(struct platform_device *pdev) if (irq < 0) return irq; - ret = request_irq(irq, ks_pcie_err_irq_handler, IRQF_SHARED, - "ks-pcie-error-irq", ks_pcie); + ret = devm_request_irq(dev, irq, ks_pcie_err_irq_handler, IRQF_SHARED, + "ks-pcie-error-irq", ks_pcie); if (ret < 0) { dev_err(dev, "failed to request error IRQ %d\n", irq); @@ -1213,11 +1212,11 @@ static int ks_pcie_probe(struct platform_device *pdev) if (ret) num_lanes = 1; - phy = devm_kzalloc(dev, sizeof(*phy) * num_lanes, GFP_KERNEL); + phy = devm_kcalloc(dev, num_lanes, sizeof(*phy), GFP_KERNEL); if (!phy) return -ENOMEM; - link = devm_kzalloc(dev, sizeof(*link) * num_lanes, GFP_KERNEL); + link = devm_kcalloc(dev, num_lanes, sizeof(*link), GFP_KERNEL); if (!link) return -ENOMEM; diff --git a/drivers/pci/controller/dwc/pcie-al.c b/drivers/pci/controller/dwc/pcie-al.c index 643115f74092..345c281c74fe 100644 --- a/drivers/pci/controller/dwc/pcie-al.c +++ b/drivers/pci/controller/dwc/pcie-al.c @@ -352,6 +352,7 @@ static int al_pcie_probe(struct platform_device *pdev) return -ENOENT; } al_pcie->ecam_size = resource_size(ecam_res); + pci->pp.native_ecam = true; controller_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "controller"); diff --git a/drivers/pci/controller/dwc/pcie-amd-mdb.c b/drivers/pci/controller/dwc/pcie-amd-mdb.c index 9f7251a16d32..3c6e837465bb 100644 --- a/drivers/pci/controller/dwc/pcie-amd-mdb.c +++ b/drivers/pci/controller/dwc/pcie-amd-mdb.c @@ -18,6 +18,7 @@ #include <linux/resource.h> #include <linux/types.h> +#include "../../pci.h" #include "pcie-designware.h" #define AMD_MDB_TLP_IR_STATUS_MISC 0x4C0 @@ -56,6 +57,7 @@ * @slcr: MDB System Level Control and Status Register (SLCR) base * @intx_domain: INTx IRQ domain pointer * @mdb_domain: MDB IRQ domain pointer + * @perst_gpio: GPIO descriptor for PERST# signal handling * @intx_irq: INTx IRQ interrupt number */ struct amd_mdb_pcie { @@ -63,6 +65,7 @@ struct amd_mdb_pcie { void __iomem *slcr; struct irq_domain *intx_domain; struct irq_domain *mdb_domain; + struct gpio_desc *perst_gpio; int intx_irq; }; @@ -284,7 +287,7 @@ static int amd_mdb_pcie_init_irq_domains(struct amd_mdb_pcie *pcie, struct device_node *pcie_intc_node; int err; - pcie_intc_node = of_get_next_child(node, NULL); + pcie_intc_node = of_get_child_by_name(node, "interrupt-controller"); if (!pcie_intc_node) { dev_err(dev, "No PCIe Intc node found\n"); return -ENODEV; @@ -402,6 +405,28 @@ static int amd_mdb_setup_irq(struct amd_mdb_pcie *pcie, return 0; } +static int amd_mdb_parse_pcie_port(struct amd_mdb_pcie *pcie) +{ + struct device *dev = pcie->pci.dev; + struct device_node *pcie_port_node __maybe_unused; + + /* + * This platform currently supports only one Root Port, so the loop + * will execute only once. + * TODO: Enhance the driver to handle multiple Root Ports in the future. + */ + for_each_child_of_node_with_prefix(dev->of_node, pcie_port_node, "pcie") { + pcie->perst_gpio = devm_fwnode_gpiod_get(dev, of_fwnode_handle(pcie_port_node), + "reset", GPIOD_OUT_HIGH, NULL); + if (IS_ERR(pcie->perst_gpio)) + return dev_err_probe(dev, PTR_ERR(pcie->perst_gpio), + "Failed to request reset GPIO\n"); + return 0; + } + + return -ENODEV; +} + static int amd_mdb_add_pcie_port(struct amd_mdb_pcie *pcie, struct platform_device *pdev) { @@ -426,6 +451,12 @@ static int amd_mdb_add_pcie_port(struct amd_mdb_pcie *pcie, pp->ops = &amd_mdb_pcie_host_ops; + if (pcie->perst_gpio) { + mdelay(PCIE_T_PVPERL_MS); + gpiod_set_value_cansleep(pcie->perst_gpio, 0); + mdelay(PCIE_RESET_CONFIG_WAIT_MS); + } + err = dw_pcie_host_init(pp); if (err) { dev_err(dev, "Failed to initialize host, err=%d\n", err); @@ -444,6 +475,7 @@ static int amd_mdb_pcie_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; struct amd_mdb_pcie *pcie; struct dw_pcie *pci; + int ret; pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL); if (!pcie) @@ -454,6 +486,24 @@ static int amd_mdb_pcie_probe(struct platform_device *pdev) platform_set_drvdata(pdev, pcie); + ret = amd_mdb_parse_pcie_port(pcie); + /* + * If amd_mdb_parse_pcie_port returns -ENODEV, it indicates that the + * PCIe Bridge node was not found in the device tree. This is not + * considered a fatal error and will trigger a fallback where the + * reset GPIO is acquired directly from the PCIe Host Bridge node. + */ + if (ret) { + if (ret != -ENODEV) + return ret; + + pcie->perst_gpio = devm_gpiod_get_optional(dev, "reset", + GPIOD_OUT_HIGH); + if (IS_ERR(pcie->perst_gpio)) + return dev_err_probe(dev, PTR_ERR(pcie->perst_gpio), + "Failed to request reset GPIO\n"); + } + return amd_mdb_add_pcie_port(pcie, pdev); } diff --git a/drivers/pci/controller/dwc/pcie-artpec6.c b/drivers/pci/controller/dwc/pcie-artpec6.c index 234c8cbcae3a..f4a136ee2daf 100644 --- a/drivers/pci/controller/dwc/pcie-artpec6.c +++ b/drivers/pci/controller/dwc/pcie-artpec6.c @@ -370,9 +370,7 @@ static int artpec6_pcie_raise_irq(struct dw_pcie_ep *ep, u8 func_no, } static const struct pci_epc_features artpec6_pcie_epc_features = { - .linkup_notifier = false, .msi_capable = true, - .msix_capable = false, }; static const struct pci_epc_features * diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c index 0ae54a94809b..7f2112c2fb21 100644 --- a/drivers/pci/controller/dwc/pcie-designware-ep.c +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c @@ -69,37 +69,10 @@ void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar) } EXPORT_SYMBOL_GPL(dw_pcie_ep_reset_bar); -static u8 __dw_pcie_ep_find_next_cap(struct dw_pcie_ep *ep, u8 func_no, - u8 cap_ptr, u8 cap) -{ - u8 cap_id, next_cap_ptr; - u16 reg; - - if (!cap_ptr) - return 0; - - reg = dw_pcie_ep_readw_dbi(ep, func_no, cap_ptr); - cap_id = (reg & 0x00ff); - - if (cap_id > PCI_CAP_ID_MAX) - return 0; - - if (cap_id == cap) - return cap_ptr; - - next_cap_ptr = (reg & 0xff00) >> 8; - return __dw_pcie_ep_find_next_cap(ep, func_no, next_cap_ptr, cap); -} - static u8 dw_pcie_ep_find_capability(struct dw_pcie_ep *ep, u8 func_no, u8 cap) { - u8 next_cap_ptr; - u16 reg; - - reg = dw_pcie_ep_readw_dbi(ep, func_no, PCI_CAPABILITY_LIST); - next_cap_ptr = (reg & 0x00ff); - - return __dw_pcie_ep_find_next_cap(ep, func_no, next_cap_ptr, cap); + return PCI_FIND_NEXT_CAP(dw_pcie_ep_read_cfg, PCI_CAPABILITY_LIST, + cap, ep, func_no); } /** diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c index 952f8594b501..20c9333bcb1c 100644 --- a/drivers/pci/controller/dwc/pcie-designware-host.c +++ b/drivers/pci/controller/dwc/pcie-designware-host.c @@ -8,6 +8,7 @@ * Author: Jingoo Han <jg1.han@samsung.com> */ +#include <linux/align.h> #include <linux/iopoll.h> #include <linux/irqchip/chained_irq.h> #include <linux/irqchip/irq-msi-lib.h> @@ -32,6 +33,8 @@ static struct pci_ops dw_child_pcie_ops; MSI_FLAG_PCI_MSIX | \ MSI_GENERIC_FLAGS_MASK) +#define IS_256MB_ALIGNED(x) IS_ALIGNED(x, SZ_256M) + static const struct msi_parent_ops dw_pcie_msi_parent_ops = { .required_flags = DW_PCIE_MSI_FLAGS_REQUIRED, .supported_flags = DW_PCIE_MSI_FLAGS_SUPPORTED, @@ -413,6 +416,95 @@ static void dw_pcie_host_request_msg_tlp_res(struct dw_pcie_rp *pp) } } +static int dw_pcie_config_ecam_iatu(struct dw_pcie_rp *pp) +{ + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); + struct dw_pcie_ob_atu_cfg atu = {0}; + resource_size_t bus_range_max; + struct resource_entry *bus; + int ret; + + bus = resource_list_first_type(&pp->bridge->windows, IORESOURCE_BUS); + + /* + * Root bus under the host bridge doesn't require any iATU configuration + * as DBI region will be used to access root bus config space. + * Immediate bus under Root Bus, needs type 0 iATU configuration and + * remaining buses need type 1 iATU configuration. + */ + atu.index = 0; + atu.type = PCIE_ATU_TYPE_CFG0; + atu.parent_bus_addr = pp->cfg0_base + SZ_1M; + /* 1MiB is to cover 1 (bus) * 32 (devices) * 8 (functions) */ + atu.size = SZ_1M; + atu.ctrl2 = PCIE_ATU_CFG_SHIFT_MODE_ENABLE; + ret = dw_pcie_prog_outbound_atu(pci, &atu); + if (ret) + return ret; + + bus_range_max = resource_size(bus->res); + + if (bus_range_max < 2) + return 0; + + /* Configure remaining buses in type 1 iATU configuration */ + atu.index = 1; + atu.type = PCIE_ATU_TYPE_CFG1; + atu.parent_bus_addr = pp->cfg0_base + SZ_2M; + atu.size = (SZ_1M * bus_range_max) - SZ_2M; + atu.ctrl2 = PCIE_ATU_CFG_SHIFT_MODE_ENABLE; + + return dw_pcie_prog_outbound_atu(pci, &atu); +} + +static int dw_pcie_create_ecam_window(struct dw_pcie_rp *pp, struct resource *res) +{ + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); + struct device *dev = pci->dev; + struct resource_entry *bus; + + bus = resource_list_first_type(&pp->bridge->windows, IORESOURCE_BUS); + if (!bus) + return -ENODEV; + + pp->cfg = pci_ecam_create(dev, res, bus->res, &pci_generic_ecam_ops); + if (IS_ERR(pp->cfg)) + return PTR_ERR(pp->cfg); + + pci->dbi_base = pp->cfg->win; + pci->dbi_phys_addr = res->start; + + return 0; +} + +static bool dw_pcie_ecam_enabled(struct dw_pcie_rp *pp, struct resource *config_res) +{ + struct resource *bus_range; + u64 nr_buses; + + /* Vendor glue drivers may implement their own ECAM mechanism */ + if (pp->native_ecam) + return false; + + /* + * PCIe spec r6.0, sec 7.2.2 mandates the base address used for ECAM to + * be aligned on a 2^(n+20) byte boundary, where n is the number of bits + * used for representing 'bus' in BDF. Since the DWC cores always use 8 + * bits for representing 'bus', the base address has to be aligned to + * 2^28 byte boundary, which is 256 MiB. + */ + if (!IS_256MB_ALIGNED(config_res->start)) + return false; + + bus_range = resource_list_first_type(&pp->bridge->windows, IORESOURCE_BUS)->res; + if (!bus_range) + return false; + + nr_buses = resource_size(config_res) >> PCIE_ECAM_BUS_SHIFT; + + return nr_buses >= resource_size(bus_range); +} + static int dw_pcie_host_get_resources(struct dw_pcie_rp *pp) { struct dw_pcie *pci = to_dw_pcie_from_pp(pp); @@ -422,10 +514,6 @@ static int dw_pcie_host_get_resources(struct dw_pcie_rp *pp) struct resource *res; int ret; - ret = dw_pcie_get_resources(pci); - if (ret) - return ret; - res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config"); if (!res) { dev_err(dev, "Missing \"config\" reg space\n"); @@ -435,9 +523,32 @@ static int dw_pcie_host_get_resources(struct dw_pcie_rp *pp) pp->cfg0_size = resource_size(res); pp->cfg0_base = res->start; - pp->va_cfg0_base = devm_pci_remap_cfg_resource(dev, res); - if (IS_ERR(pp->va_cfg0_base)) - return PTR_ERR(pp->va_cfg0_base); + pp->ecam_enabled = dw_pcie_ecam_enabled(pp, res); + if (pp->ecam_enabled) { + ret = dw_pcie_create_ecam_window(pp, res); + if (ret) + return ret; + + pp->bridge->ops = (struct pci_ops *)&pci_generic_ecam_ops.pci_ops; + pp->bridge->sysdata = pp->cfg; + pp->cfg->priv = pp; + } else { + pp->va_cfg0_base = devm_pci_remap_cfg_resource(dev, res); + if (IS_ERR(pp->va_cfg0_base)) + return PTR_ERR(pp->va_cfg0_base); + + /* Set default bus ops */ + pp->bridge->ops = &dw_pcie_ops; + pp->bridge->child_ops = &dw_child_pcie_ops; + pp->bridge->sysdata = pp; + } + + ret = dw_pcie_get_resources(pci); + if (ret) { + if (pp->cfg) + pci_ecam_free(pp->cfg); + return ret; + } /* Get the I/O range from DT */ win = resource_list_first_type(&pp->bridge->windows, IORESOURCE_IO); @@ -476,14 +587,10 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp) if (ret) return ret; - /* Set default bus ops */ - bridge->ops = &dw_pcie_ops; - bridge->child_ops = &dw_child_pcie_ops; - if (pp->ops->init) { ret = pp->ops->init(pp); if (ret) - return ret; + goto err_free_ecam; } if (pci_msi_enabled()) { @@ -525,6 +632,14 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp) if (ret) goto err_free_msi; + if (pp->ecam_enabled) { + ret = dw_pcie_config_ecam_iatu(pp); + if (ret) { + dev_err(dev, "Failed to configure iATU in ECAM mode\n"); + goto err_free_msi; + } + } + /* * Allocate the resource for MSG TLP before programming the iATU * outbound window in dw_pcie_setup_rc(). Since the allocation depends @@ -560,8 +675,6 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp) /* Ignore errors, the link may come up later */ dw_pcie_wait_for_link(pci); - bridge->sysdata = pp; - ret = pci_host_probe(bridge); if (ret) goto err_stop_link; @@ -587,6 +700,10 @@ err_deinit_host: if (pp->ops->deinit) pp->ops->deinit(pp); +err_free_ecam: + if (pp->cfg) + pci_ecam_free(pp->cfg); + return ret; } EXPORT_SYMBOL_GPL(dw_pcie_host_init); @@ -609,6 +726,9 @@ void dw_pcie_host_deinit(struct dw_pcie_rp *pp) if (pp->ops->deinit) pp->ops->deinit(pp); + + if (pp->cfg) + pci_ecam_free(pp->cfg); } EXPORT_SYMBOL_GPL(dw_pcie_host_deinit); diff --git a/drivers/pci/controller/dwc/pcie-designware-plat.c b/drivers/pci/controller/dwc/pcie-designware-plat.c index 771b9d9be077..12f41886c65d 100644 --- a/drivers/pci/controller/dwc/pcie-designware-plat.c +++ b/drivers/pci/controller/dwc/pcie-designware-plat.c @@ -61,7 +61,6 @@ static int dw_plat_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no, } static const struct pci_epc_features dw_plat_pcie_epc_features = { - .linkup_notifier = false, .msi_capable = true, .msix_capable = true, }; diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c index 89aad5a08928..c644216995f6 100644 --- a/drivers/pci/controller/dwc/pcie-designware.c +++ b/drivers/pci/controller/dwc/pcie-designware.c @@ -167,6 +167,14 @@ int dw_pcie_get_resources(struct dw_pcie *pci) } } + /* ELBI is an optional resource */ + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "elbi"); + if (res) { + pci->elbi_base = devm_ioremap_resource(pci->dev, res); + if (IS_ERR(pci->elbi_base)) + return PTR_ERR(pci->elbi_base); + } + /* LLDD is supposed to manually switch the clocks and resets state */ if (dw_pcie_cap_is(pci, REQ_RES)) { ret = dw_pcie_get_clocks(pci); @@ -213,83 +221,16 @@ void dw_pcie_version_detect(struct dw_pcie *pci) pci->type = ver; } -/* - * These interfaces resemble the pci_find_*capability() interfaces, but these - * are for configuring host controllers, which are bridges *to* PCI devices but - * are not PCI devices themselves. - */ -static u8 __dw_pcie_find_next_cap(struct dw_pcie *pci, u8 cap_ptr, - u8 cap) -{ - u8 cap_id, next_cap_ptr; - u16 reg; - - if (!cap_ptr) - return 0; - - reg = dw_pcie_readw_dbi(pci, cap_ptr); - cap_id = (reg & 0x00ff); - - if (cap_id > PCI_CAP_ID_MAX) - return 0; - - if (cap_id == cap) - return cap_ptr; - - next_cap_ptr = (reg & 0xff00) >> 8; - return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap); -} - u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap) { - u8 next_cap_ptr; - u16 reg; - - reg = dw_pcie_readw_dbi(pci, PCI_CAPABILITY_LIST); - next_cap_ptr = (reg & 0x00ff); - - return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap); + return PCI_FIND_NEXT_CAP(dw_pcie_read_cfg, PCI_CAPABILITY_LIST, cap, + pci); } EXPORT_SYMBOL_GPL(dw_pcie_find_capability); -static u16 dw_pcie_find_next_ext_capability(struct dw_pcie *pci, u16 start, - u8 cap) -{ - u32 header; - int ttl; - int pos = PCI_CFG_SPACE_SIZE; - - /* minimum 8 bytes per capability */ - ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8; - - if (start) - pos = start; - - header = dw_pcie_readl_dbi(pci, pos); - /* - * If we have no capabilities, this is indicated by cap ID, - * cap version and next pointer all being 0. - */ - if (header == 0) - return 0; - - while (ttl-- > 0) { - if (PCI_EXT_CAP_ID(header) == cap && pos != start) - return pos; - - pos = PCI_EXT_CAP_NEXT(header); - if (pos < PCI_CFG_SPACE_SIZE) - break; - - header = dw_pcie_readl_dbi(pci, pos); - } - - return 0; -} - u16 dw_pcie_find_ext_capability(struct dw_pcie *pci, u8 cap) { - return dw_pcie_find_next_ext_capability(pci, 0, cap); + return PCI_FIND_NEXT_EXT_CAP(dw_pcie_read_cfg, 0, cap, pci); } EXPORT_SYMBOL_GPL(dw_pcie_find_ext_capability); @@ -302,8 +243,8 @@ static u16 __dw_pcie_find_vsec_capability(struct dw_pcie *pci, u16 vendor_id, if (vendor_id != dw_pcie_readw_dbi(pci, PCI_VENDOR_ID)) return 0; - while ((vsec = dw_pcie_find_next_ext_capability(pci, vsec, - PCI_EXT_CAP_ID_VNDR))) { + while ((vsec = PCI_FIND_NEXT_EXT_CAP(dw_pcie_read_cfg, vsec, + PCI_EXT_CAP_ID_VNDR, pci))) { header = dw_pcie_readl_dbi(pci, vsec + PCI_VNDR_HEADER); if (PCI_VNDR_HEADER_ID(header) == vsec_id) return vsec; @@ -567,7 +508,7 @@ int dw_pcie_prog_outbound_atu(struct dw_pcie *pci, val = dw_pcie_enable_ecrc(val); dw_pcie_writel_atu_ob(pci, atu->index, PCIE_ATU_REGION_CTRL1, val); - val = PCIE_ATU_ENABLE; + val = PCIE_ATU_ENABLE | atu->ctrl2; if (atu->type == PCIE_ATU_TYPE_MSG) { /* The data-less messages only for now */ val |= PCIE_ATU_INHIBIT_PAYLOAD | atu->code; @@ -841,6 +782,9 @@ static void dw_pcie_link_set_max_link_width(struct dw_pcie *pci, u32 num_lanes) case 8: plc |= PORT_LINK_MODE_8_LANES; break; + case 16: + plc |= PORT_LINK_MODE_16_LANES; + break; default: dev_err(pci->dev, "num-lanes %u: invalid value\n", num_lanes); return; @@ -1045,9 +989,7 @@ static int dw_pcie_edma_irq_verify(struct dw_pcie *pci) char name[15]; int ret; - if (pci->edma.nr_irqs == 1) - return 0; - else if (pci->edma.nr_irqs > 1) + if (pci->edma.nr_irqs > 1) return pci->edma.nr_irqs != ch_cnt ? -EINVAL : 0; ret = platform_get_irq_byname_optional(pdev, "dma"); diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h index 00f52d472dcd..e995f692a1ec 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -20,6 +20,7 @@ #include <linux/irq.h> #include <linux/msi.h> #include <linux/pci.h> +#include <linux/pci-ecam.h> #include <linux/reset.h> #include <linux/pci-epc.h> @@ -90,6 +91,7 @@ #define PORT_LINK_MODE_2_LANES PORT_LINK_MODE(0x3) #define PORT_LINK_MODE_4_LANES PORT_LINK_MODE(0x7) #define PORT_LINK_MODE_8_LANES PORT_LINK_MODE(0xf) +#define PORT_LINK_MODE_16_LANES PORT_LINK_MODE(0x1f) #define PCIE_PORT_LANE_SKEW 0x714 #define PORT_LANE_SKEW_INSERT_MASK GENMASK(23, 0) @@ -123,7 +125,6 @@ #define GEN3_RELATED_OFF_GEN3_EQ_DISABLE BIT(16) #define GEN3_RELATED_OFF_RATE_SHADOW_SEL_SHIFT 24 #define GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK GENMASK(25, 24) -#define GEN3_RELATED_OFF_RATE_SHADOW_SEL_16_0GT 0x1 #define GEN3_EQ_CONTROL_OFF 0x8A8 #define GEN3_EQ_CONTROL_OFF_FB_MODE GENMASK(3, 0) @@ -134,8 +135,8 @@ #define GEN3_EQ_FB_MODE_DIR_CHANGE_OFF 0x8AC #define GEN3_EQ_FMDC_T_MIN_PHASE23 GENMASK(4, 0) #define GEN3_EQ_FMDC_N_EVALS GENMASK(9, 5) -#define GEN3_EQ_FMDC_MAX_PRE_CUSROR_DELTA GENMASK(13, 10) -#define GEN3_EQ_FMDC_MAX_POST_CUSROR_DELTA GENMASK(17, 14) +#define GEN3_EQ_FMDC_MAX_PRE_CURSOR_DELTA GENMASK(13, 10) +#define GEN3_EQ_FMDC_MAX_POST_CURSOR_DELTA GENMASK(17, 14) #define PCIE_PORT_MULTI_LANE_CTRL 0x8C0 #define PORT_MLTI_UPCFG_SUPPORT BIT(7) @@ -169,6 +170,7 @@ #define PCIE_ATU_REGION_CTRL2 0x004 #define PCIE_ATU_ENABLE BIT(31) #define PCIE_ATU_BAR_MODE_ENABLE BIT(30) +#define PCIE_ATU_CFG_SHIFT_MODE_ENABLE BIT(28) #define PCIE_ATU_INHIBIT_PAYLOAD BIT(22) #define PCIE_ATU_FUNC_NUM_MATCH_EN BIT(19) #define PCIE_ATU_LOWER_BASE 0x008 @@ -387,6 +389,7 @@ struct dw_pcie_ob_atu_cfg { u8 func_no; u8 code; u8 routing; + u32 ctrl2; u64 parent_bus_addr; u64 pci_addr; u64 size; @@ -425,6 +428,9 @@ struct dw_pcie_rp { struct resource *msg_res; bool use_linkup_irq; struct pci_eq_presets presets; + struct pci_config_window *cfg; + bool ecam_enabled; + bool native_ecam; }; struct dw_pcie_ep_ops { @@ -492,6 +498,7 @@ struct dw_pcie { resource_size_t dbi_phys_addr; void __iomem *dbi_base2; void __iomem *atu_base; + void __iomem *elbi_base; resource_size_t atu_phys_addr; size_t atu_size; resource_size_t parent_bus_offset; @@ -609,6 +616,27 @@ static inline void dw_pcie_writel_dbi2(struct dw_pcie *pci, u32 reg, u32 val) dw_pcie_write_dbi2(pci, reg, 0x4, val); } +static inline int dw_pcie_read_cfg_byte(struct dw_pcie *pci, int where, + u8 *val) +{ + *val = dw_pcie_readb_dbi(pci, where); + return PCIBIOS_SUCCESSFUL; +} + +static inline int dw_pcie_read_cfg_word(struct dw_pcie *pci, int where, + u16 *val) +{ + *val = dw_pcie_readw_dbi(pci, where); + return PCIBIOS_SUCCESSFUL; +} + +static inline int dw_pcie_read_cfg_dword(struct dw_pcie *pci, int where, + u32 *val) +{ + *val = dw_pcie_readl_dbi(pci, where); + return PCIBIOS_SUCCESSFUL; +} + static inline unsigned int dw_pcie_ep_get_dbi_offset(struct dw_pcie_ep *ep, u8 func_no) { @@ -674,6 +702,27 @@ static inline u8 dw_pcie_ep_readb_dbi(struct dw_pcie_ep *ep, u8 func_no, return dw_pcie_ep_read_dbi(ep, func_no, reg, 0x1); } +static inline int dw_pcie_ep_read_cfg_byte(struct dw_pcie_ep *ep, u8 func_no, + int where, u8 *val) +{ + *val = dw_pcie_ep_readb_dbi(ep, func_no, where); + return PCIBIOS_SUCCESSFUL; +} + +static inline int dw_pcie_ep_read_cfg_word(struct dw_pcie_ep *ep, u8 func_no, + int where, u16 *val) +{ + *val = dw_pcie_ep_readw_dbi(ep, func_no, where); + return PCIBIOS_SUCCESSFUL; +} + +static inline int dw_pcie_ep_read_cfg_dword(struct dw_pcie_ep *ep, u8 func_no, + int where, u32 *val) +{ + *val = dw_pcie_ep_readl_dbi(ep, func_no, where); + return PCIBIOS_SUCCESSFUL; +} + static inline unsigned int dw_pcie_ep_get_dbi2_offset(struct dw_pcie_ep *ep, u8 func_no) { diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c index 5d7f6f544942..3e2752c7dd09 100644 --- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c +++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c @@ -331,7 +331,6 @@ static const struct pci_epc_features rockchip_pcie_epc_features_rk3568 = { .linkup_notifier = true, .msi_capable = true, .msix_capable = true, - .intx_capable = false, .align = SZ_64K, .bar[BAR_0] = { .type = BAR_RESIZABLE, }, .bar[BAR_1] = { .type = BAR_RESIZABLE, }, @@ -352,7 +351,6 @@ static const struct pci_epc_features rockchip_pcie_epc_features_rk3588 = { .linkup_notifier = true, .msi_capable = true, .msix_capable = true, - .intx_capable = false, .align = SZ_64K, .bar[BAR_0] = { .type = BAR_RESIZABLE, }, .bar[BAR_1] = { .type = BAR_RESIZABLE, }, diff --git a/drivers/pci/controller/dwc/pcie-keembay.c b/drivers/pci/controller/dwc/pcie-keembay.c index 67dd3337b447..60e74ac782af 100644 --- a/drivers/pci/controller/dwc/pcie-keembay.c +++ b/drivers/pci/controller/dwc/pcie-keembay.c @@ -309,7 +309,6 @@ static int keembay_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no, } static const struct pci_epc_features keembay_pcie_epc_features = { - .linkup_notifier = false, .msi_capable = true, .msix_capable = true, .bar[BAR_0] = { .only_64bit = true, }, diff --git a/drivers/pci/controller/dwc/pcie-qcom-common.c b/drivers/pci/controller/dwc/pcie-qcom-common.c index 3aad19b56da8..01c5387e53bf 100644 --- a/drivers/pci/controller/dwc/pcie-qcom-common.c +++ b/drivers/pci/controller/dwc/pcie-qcom-common.c @@ -8,9 +8,11 @@ #include "pcie-designware.h" #include "pcie-qcom-common.h" -void qcom_pcie_common_set_16gt_equalization(struct dw_pcie *pci) +void qcom_pcie_common_set_equalization(struct dw_pcie *pci) { + struct device *dev = pci->dev; u32 reg; + u16 speed; /* * GEN3_RELATED_OFF register is repurposed to apply equalization @@ -19,32 +21,40 @@ void qcom_pcie_common_set_16gt_equalization(struct dw_pcie *pci) * determines the data rate for which these equalization settings are * applied. */ - reg = dw_pcie_readl_dbi(pci, GEN3_RELATED_OFF); - reg &= ~GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL; - reg &= ~GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK; - reg |= FIELD_PREP(GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK, - GEN3_RELATED_OFF_RATE_SHADOW_SEL_16_0GT); - dw_pcie_writel_dbi(pci, GEN3_RELATED_OFF, reg); - reg = dw_pcie_readl_dbi(pci, GEN3_EQ_FB_MODE_DIR_CHANGE_OFF); - reg &= ~(GEN3_EQ_FMDC_T_MIN_PHASE23 | - GEN3_EQ_FMDC_N_EVALS | - GEN3_EQ_FMDC_MAX_PRE_CUSROR_DELTA | - GEN3_EQ_FMDC_MAX_POST_CUSROR_DELTA); - reg |= FIELD_PREP(GEN3_EQ_FMDC_T_MIN_PHASE23, 0x1) | - FIELD_PREP(GEN3_EQ_FMDC_N_EVALS, 0xd) | - FIELD_PREP(GEN3_EQ_FMDC_MAX_PRE_CUSROR_DELTA, 0x5) | - FIELD_PREP(GEN3_EQ_FMDC_MAX_POST_CUSROR_DELTA, 0x5); - dw_pcie_writel_dbi(pci, GEN3_EQ_FB_MODE_DIR_CHANGE_OFF, reg); + for (speed = PCIE_SPEED_8_0GT; speed <= pcie_link_speed[pci->max_link_speed]; speed++) { + if (speed > PCIE_SPEED_32_0GT) { + dev_warn(dev, "Skipped equalization settings for unsupported data rate\n"); + break; + } - reg = dw_pcie_readl_dbi(pci, GEN3_EQ_CONTROL_OFF); - reg &= ~(GEN3_EQ_CONTROL_OFF_FB_MODE | - GEN3_EQ_CONTROL_OFF_PHASE23_EXIT_MODE | - GEN3_EQ_CONTROL_OFF_FOM_INC_INITIAL_EVAL | - GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC); - dw_pcie_writel_dbi(pci, GEN3_EQ_CONTROL_OFF, reg); + reg = dw_pcie_readl_dbi(pci, GEN3_RELATED_OFF); + reg &= ~GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL; + reg &= ~GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK; + reg |= FIELD_PREP(GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK, + speed - PCIE_SPEED_8_0GT); + dw_pcie_writel_dbi(pci, GEN3_RELATED_OFF, reg); + + reg = dw_pcie_readl_dbi(pci, GEN3_EQ_FB_MODE_DIR_CHANGE_OFF); + reg &= ~(GEN3_EQ_FMDC_T_MIN_PHASE23 | + GEN3_EQ_FMDC_N_EVALS | + GEN3_EQ_FMDC_MAX_PRE_CURSOR_DELTA | + GEN3_EQ_FMDC_MAX_POST_CURSOR_DELTA); + reg |= FIELD_PREP(GEN3_EQ_FMDC_T_MIN_PHASE23, 0x1) | + FIELD_PREP(GEN3_EQ_FMDC_N_EVALS, 0xd) | + FIELD_PREP(GEN3_EQ_FMDC_MAX_PRE_CURSOR_DELTA, 0x5) | + FIELD_PREP(GEN3_EQ_FMDC_MAX_POST_CURSOR_DELTA, 0x5); + dw_pcie_writel_dbi(pci, GEN3_EQ_FB_MODE_DIR_CHANGE_OFF, reg); + + reg = dw_pcie_readl_dbi(pci, GEN3_EQ_CONTROL_OFF); + reg &= ~(GEN3_EQ_CONTROL_OFF_FB_MODE | + GEN3_EQ_CONTROL_OFF_PHASE23_EXIT_MODE | + GEN3_EQ_CONTROL_OFF_FOM_INC_INITIAL_EVAL | + GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC); + dw_pcie_writel_dbi(pci, GEN3_EQ_CONTROL_OFF, reg); + } } -EXPORT_SYMBOL_GPL(qcom_pcie_common_set_16gt_equalization); +EXPORT_SYMBOL_GPL(qcom_pcie_common_set_equalization); void qcom_pcie_common_set_16gt_lane_margining(struct dw_pcie *pci) { diff --git a/drivers/pci/controller/dwc/pcie-qcom-common.h b/drivers/pci/controller/dwc/pcie-qcom-common.h index 7d88d29e4766..7f5ca2fd9a72 100644 --- a/drivers/pci/controller/dwc/pcie-qcom-common.h +++ b/drivers/pci/controller/dwc/pcie-qcom-common.h @@ -8,7 +8,7 @@ struct dw_pcie; -void qcom_pcie_common_set_16gt_equalization(struct dw_pcie *pci); +void qcom_pcie_common_set_equalization(struct dw_pcie *pci); void qcom_pcie_common_set_16gt_lane_margining(struct dw_pcie *pci); #endif diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c index bf7c6ac0f3e3..f1bc0ac81a92 100644 --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c @@ -179,7 +179,6 @@ struct qcom_pcie_ep_cfg { * struct qcom_pcie_ep - Qualcomm PCIe Endpoint Controller * @pci: Designware PCIe controller struct * @parf: Qualcomm PCIe specific PARF register base - * @elbi: Designware PCIe specific ELBI register base * @mmio: MMIO register base * @perst_map: PERST regmap * @mmio_res: MMIO region resource @@ -202,7 +201,6 @@ struct qcom_pcie_ep { struct dw_pcie pci; void __iomem *parf; - void __iomem *elbi; void __iomem *mmio; struct regmap *perst_map; struct resource *mmio_res; @@ -267,10 +265,9 @@ static void qcom_pcie_ep_configure_tcsr(struct qcom_pcie_ep *pcie_ep) static bool qcom_pcie_dw_link_up(struct dw_pcie *pci) { - struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci); u32 reg; - reg = readl_relaxed(pcie_ep->elbi + ELBI_SYS_STTS); + reg = readl_relaxed(pci->elbi_base + ELBI_SYS_STTS); return reg & XMLH_LINK_UP; } @@ -294,16 +291,15 @@ static void qcom_pcie_dw_stop_link(struct dw_pcie *pci) static void qcom_pcie_dw_write_dbi2(struct dw_pcie *pci, void __iomem *base, u32 reg, size_t size, u32 val) { - struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci); int ret; - writel(1, pcie_ep->elbi + ELBI_CS2_ENABLE); + writel(1, pci->elbi_base + ELBI_CS2_ENABLE); ret = dw_pcie_write(pci->dbi_base2 + reg, size, val); if (ret) dev_err(pci->dev, "Failed to write DBI2 register (0x%x): %d\n", reg, ret); - writel(0, pcie_ep->elbi + ELBI_CS2_ENABLE); + writel(0, pci->elbi_base + ELBI_CS2_ENABLE); } static void qcom_pcie_ep_icc_update(struct qcom_pcie_ep *pcie_ep) @@ -511,10 +507,10 @@ static int qcom_pcie_perst_deassert(struct dw_pcie *pci) goto err_disable_resources; } - if (pcie_link_speed[pci->max_link_speed] == PCIE_SPEED_16_0GT) { - qcom_pcie_common_set_16gt_equalization(pci); + qcom_pcie_common_set_equalization(pci); + + if (pcie_link_speed[pci->max_link_speed] == PCIE_SPEED_16_0GT) qcom_pcie_common_set_16gt_lane_margining(pci); - } /* * The physical address of the MMIO region which is exposed as the BAR @@ -583,11 +579,6 @@ static int qcom_pcie_ep_get_io_resources(struct platform_device *pdev, return PTR_ERR(pci->dbi_base); pci->dbi_base2 = pci->dbi_base; - res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "elbi"); - pcie_ep->elbi = devm_pci_remap_cfg_resource(dev, res); - if (IS_ERR(pcie_ep->elbi)) - return PTR_ERR(pcie_ep->elbi); - pcie_ep->mmio_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mmio"); if (!pcie_ep->mmio_res) { @@ -831,7 +822,6 @@ static void qcom_pcie_ep_init_debugfs(struct qcom_pcie_ep *pcie_ep) static const struct pci_epc_features qcom_pcie_epc_features = { .linkup_notifier = true, .msi_capable = true, - .msix_capable = false, .align = SZ_4K, .bar[BAR_0] = { .only_64bit = true, }, .bar[BAR_1] = { .type = BAR_RESERVED, }, @@ -874,7 +864,6 @@ static int qcom_pcie_ep_probe(struct platform_device *pdev) pcie_ep->pci.dev = dev; pcie_ep->pci.ops = &pci_ops; pcie_ep->pci.ep.ops = &pci_ep_ops; - pcie_ep->pci.edma.nr_irqs = 1; pcie_ep->cfg = of_device_get_match_data(dev); if (pcie_ep->cfg && pcie_ep->cfg->hdma_support) { diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c index 294babe1816e..805edbbfe7eb 100644 --- a/drivers/pci/controller/dwc/pcie-qcom.c +++ b/drivers/pci/controller/dwc/pcie-qcom.c @@ -55,6 +55,7 @@ #define PARF_AXI_MSTR_WR_ADDR_HALT_V2 0x1a8 #define PARF_Q2A_FLUSH 0x1ac #define PARF_LTSSM 0x1b0 +#define PARF_SLV_DBI_ELBI 0x1b4 #define PARF_INT_ALL_STATUS 0x224 #define PARF_INT_ALL_CLEAR 0x228 #define PARF_INT_ALL_MASK 0x22c @@ -64,6 +65,16 @@ #define PARF_DBI_BASE_ADDR_V2_HI 0x354 #define PARF_SLV_ADDR_SPACE_SIZE_V2 0x358 #define PARF_SLV_ADDR_SPACE_SIZE_V2_HI 0x35c +#define PARF_BLOCK_SLV_AXI_WR_BASE 0x360 +#define PARF_BLOCK_SLV_AXI_WR_BASE_HI 0x364 +#define PARF_BLOCK_SLV_AXI_WR_LIMIT 0x368 +#define PARF_BLOCK_SLV_AXI_WR_LIMIT_HI 0x36c +#define PARF_BLOCK_SLV_AXI_RD_BASE 0x370 +#define PARF_BLOCK_SLV_AXI_RD_BASE_HI 0x374 +#define PARF_BLOCK_SLV_AXI_RD_LIMIT 0x378 +#define PARF_BLOCK_SLV_AXI_RD_LIMIT_HI 0x37c +#define PARF_ECAM_BASE 0x380 +#define PARF_ECAM_BASE_HI 0x384 #define PARF_NO_SNOOP_OVERRIDE 0x3d4 #define PARF_ATU_BASE_ADDR 0x634 #define PARF_ATU_BASE_ADDR_HI 0x638 @@ -87,6 +98,7 @@ /* PARF_SYS_CTRL register fields */ #define MAC_PHY_POWERDOWN_IN_P2_D_MUX_EN BIT(29) +#define PCIE_ECAM_BLOCKER_EN BIT(26) #define MST_WAKEUP_EN BIT(13) #define SLV_WAKEUP_EN BIT(12) #define MSTR_ACLK_CGC_DIS BIT(10) @@ -134,6 +146,9 @@ /* PARF_LTSSM register fields */ #define LTSSM_EN BIT(8) +/* PARF_SLV_DBI_ELBI */ +#define SLV_DBI_ELBI_ADDR_BASE GENMASK(11, 0) + /* PARF_INT_ALL_{STATUS/CLEAR/MASK} register fields */ #define PARF_INT_ALL_LINK_UP BIT(13) #define PARF_INT_MSI_DEV_0_7 GENMASK(30, 23) @@ -247,7 +262,6 @@ struct qcom_pcie_ops { int (*get_resources)(struct qcom_pcie *pcie); int (*init)(struct qcom_pcie *pcie); int (*post_init)(struct qcom_pcie *pcie); - void (*host_post_init)(struct qcom_pcie *pcie); void (*deinit)(struct qcom_pcie *pcie); void (*ltssm_enable)(struct qcom_pcie *pcie); int (*config_sid)(struct qcom_pcie *pcie); @@ -276,11 +290,8 @@ struct qcom_pcie_port { struct qcom_pcie { struct dw_pcie *pci; void __iomem *parf; /* DT parf */ - void __iomem *elbi; /* DT elbi */ void __iomem *mhi; union qcom_pcie_resources res; - struct phy *phy; - struct gpio_desc *reset; struct icc_path *icc_mem; struct icc_path *icc_cpu; const struct qcom_pcie_cfg *cfg; @@ -297,11 +308,8 @@ static void qcom_perst_assert(struct qcom_pcie *pcie, bool assert) struct qcom_pcie_port *port; int val = assert ? 1 : 0; - if (list_empty(&pcie->ports)) - gpiod_set_value_cansleep(pcie->reset, val); - else - list_for_each_entry(port, &pcie->ports, list) - gpiod_set_value_cansleep(port->reset, val); + list_for_each_entry(port, &pcie->ports, list) + gpiod_set_value_cansleep(port->reset, val); usleep_range(PERST_DELAY_US, PERST_DELAY_US + 500); } @@ -318,14 +326,55 @@ static void qcom_ep_reset_deassert(struct qcom_pcie *pcie) qcom_perst_assert(pcie, false); } +static void qcom_pci_config_ecam(struct dw_pcie_rp *pp) +{ + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); + struct qcom_pcie *pcie = to_qcom_pcie(pci); + u64 addr, addr_end; + u32 val; + + writel_relaxed(lower_32_bits(pci->dbi_phys_addr), pcie->parf + PARF_ECAM_BASE); + writel_relaxed(upper_32_bits(pci->dbi_phys_addr), pcie->parf + PARF_ECAM_BASE_HI); + + /* + * The only device on the root bus is a single Root Port. If we try to + * access any devices other than Device/Function 00.0 on Bus 0, the TLP + * will go outside of the controller to the PCI bus. But with CFG Shift + * Feature (ECAM) enabled in iATU, there is no guarantee that the + * response is going to be all F's. Hence, to make sure that the + * requester gets all F's response for accesses other than the Root + * Port, configure iATU to block the transactions starting from + * function 1 of the root bus to the end of the root bus (i.e., from + * dbi_base + 4KB to dbi_base + 1MB). + */ + addr = pci->dbi_phys_addr + SZ_4K; + writel_relaxed(lower_32_bits(addr), pcie->parf + PARF_BLOCK_SLV_AXI_WR_BASE); + writel_relaxed(upper_32_bits(addr), pcie->parf + PARF_BLOCK_SLV_AXI_WR_BASE_HI); + + writel_relaxed(lower_32_bits(addr), pcie->parf + PARF_BLOCK_SLV_AXI_RD_BASE); + writel_relaxed(upper_32_bits(addr), pcie->parf + PARF_BLOCK_SLV_AXI_RD_BASE_HI); + + addr_end = pci->dbi_phys_addr + SZ_1M - 1; + + writel_relaxed(lower_32_bits(addr_end), pcie->parf + PARF_BLOCK_SLV_AXI_WR_LIMIT); + writel_relaxed(upper_32_bits(addr_end), pcie->parf + PARF_BLOCK_SLV_AXI_WR_LIMIT_HI); + + writel_relaxed(lower_32_bits(addr_end), pcie->parf + PARF_BLOCK_SLV_AXI_RD_LIMIT); + writel_relaxed(upper_32_bits(addr_end), pcie->parf + PARF_BLOCK_SLV_AXI_RD_LIMIT_HI); + + val = readl_relaxed(pcie->parf + PARF_SYS_CTRL); + val |= PCIE_ECAM_BLOCKER_EN; + writel_relaxed(val, pcie->parf + PARF_SYS_CTRL); +} + static int qcom_pcie_start_link(struct dw_pcie *pci) { struct qcom_pcie *pcie = to_qcom_pcie(pci); - if (pcie_link_speed[pci->max_link_speed] == PCIE_SPEED_16_0GT) { - qcom_pcie_common_set_16gt_equalization(pci); + qcom_pcie_common_set_equalization(pci); + + if (pcie_link_speed[pci->max_link_speed] == PCIE_SPEED_16_0GT) qcom_pcie_common_set_16gt_lane_margining(pci); - } /* Enable Link Training state machine */ if (pcie->cfg->ops->ltssm_enable) @@ -414,12 +463,17 @@ static void qcom_pcie_configure_dbi_atu_base(struct qcom_pcie *pcie) static void qcom_pcie_2_1_0_ltssm_enable(struct qcom_pcie *pcie) { + struct dw_pcie *pci = pcie->pci; u32 val; + if (!pci->elbi_base) { + dev_err(pci->dev, "ELBI is not present\n"); + return; + } /* enable link training */ - val = readl(pcie->elbi + ELBI_SYS_CTRL); + val = readl(pci->elbi_base + ELBI_SYS_CTRL); val |= ELBI_SYS_CTRL_LT_ENABLE; - writel(val, pcie->elbi + ELBI_SYS_CTRL); + writel(val, pci->elbi_base + ELBI_SYS_CTRL); } static int qcom_pcie_get_resources_2_1_0(struct qcom_pcie *pcie) @@ -1040,25 +1094,6 @@ static int qcom_pcie_post_init_2_7_0(struct qcom_pcie *pcie) return 0; } -static int qcom_pcie_enable_aspm(struct pci_dev *pdev, void *userdata) -{ - /* - * Downstream devices need to be in D0 state before enabling PCI PM - * substates. - */ - pci_set_power_state_locked(pdev, PCI_D0); - pci_enable_link_state_locked(pdev, PCIE_LINK_STATE_ALL); - - return 0; -} - -static void qcom_pcie_host_post_init_2_7_0(struct qcom_pcie *pcie) -{ - struct dw_pcie_rp *pp = &pcie->pci->pp; - - pci_walk_bus(pp->bridge->bus, qcom_pcie_enable_aspm, NULL); -} - static void qcom_pcie_deinit_2_7_0(struct qcom_pcie *pcie) { struct qcom_pcie_resources_2_7_0 *res = &pcie->res.v2_7_0; @@ -1253,63 +1288,39 @@ static bool qcom_pcie_link_up(struct dw_pcie *pci) return val & PCI_EXP_LNKSTA_DLLLA; } -static void qcom_pcie_phy_exit(struct qcom_pcie *pcie) -{ - struct qcom_pcie_port *port; - - if (list_empty(&pcie->ports)) - phy_exit(pcie->phy); - else - list_for_each_entry(port, &pcie->ports, list) - phy_exit(port->phy); -} - static void qcom_pcie_phy_power_off(struct qcom_pcie *pcie) { struct qcom_pcie_port *port; - if (list_empty(&pcie->ports)) { - phy_power_off(pcie->phy); - } else { - list_for_each_entry(port, &pcie->ports, list) - phy_power_off(port->phy); - } + list_for_each_entry(port, &pcie->ports, list) + phy_power_off(port->phy); } static int qcom_pcie_phy_power_on(struct qcom_pcie *pcie) { struct qcom_pcie_port *port; - int ret = 0; + int ret; - if (list_empty(&pcie->ports)) { - ret = phy_set_mode_ext(pcie->phy, PHY_MODE_PCIE, PHY_MODE_PCIE_RC); + list_for_each_entry(port, &pcie->ports, list) { + ret = phy_set_mode_ext(port->phy, PHY_MODE_PCIE, PHY_MODE_PCIE_RC); if (ret) return ret; - ret = phy_power_on(pcie->phy); - if (ret) + ret = phy_power_on(port->phy); + if (ret) { + qcom_pcie_phy_power_off(pcie); return ret; - } else { - list_for_each_entry(port, &pcie->ports, list) { - ret = phy_set_mode_ext(port->phy, PHY_MODE_PCIE, PHY_MODE_PCIE_RC); - if (ret) - return ret; - - ret = phy_power_on(port->phy); - if (ret) { - qcom_pcie_phy_power_off(pcie); - return ret; - } } } - return ret; + return 0; } static int qcom_pcie_host_init(struct dw_pcie_rp *pp) { struct dw_pcie *pci = to_dw_pcie_from_pp(pp); struct qcom_pcie *pcie = to_qcom_pcie(pci); + u16 offset; int ret; qcom_ep_reset_assert(pcie); @@ -1318,6 +1329,17 @@ static int qcom_pcie_host_init(struct dw_pcie_rp *pp) if (ret) return ret; + if (pp->ecam_enabled) { + /* + * Override ELBI when ECAM is enabled, as when ECAM is enabled, + * ELBI moves under the 'config' space. + */ + offset = FIELD_GET(SLV_DBI_ELBI_ADDR_BASE, readl(pcie->parf + PARF_SLV_DBI_ELBI)); + pci->elbi_base = pci->dbi_base + offset; + + qcom_pci_config_ecam(pp); + } + ret = qcom_pcie_phy_power_on(pcie); if (ret) goto err_deinit; @@ -1358,19 +1380,9 @@ static void qcom_pcie_host_deinit(struct dw_pcie_rp *pp) pcie->cfg->ops->deinit(pcie); } -static void qcom_pcie_host_post_init(struct dw_pcie_rp *pp) -{ - struct dw_pcie *pci = to_dw_pcie_from_pp(pp); - struct qcom_pcie *pcie = to_qcom_pcie(pci); - - if (pcie->cfg->ops->host_post_init) - pcie->cfg->ops->host_post_init(pcie); -} - static const struct dw_pcie_host_ops qcom_pcie_dw_ops = { .init = qcom_pcie_host_init, .deinit = qcom_pcie_host_deinit, - .post_init = qcom_pcie_host_post_init, }; /* Qcom IP rev.: 2.1.0 Synopsys IP rev.: 4.01a */ @@ -1432,7 +1444,6 @@ static const struct qcom_pcie_ops ops_1_9_0 = { .get_resources = qcom_pcie_get_resources_2_7_0, .init = qcom_pcie_init_2_7_0, .post_init = qcom_pcie_post_init_2_7_0, - .host_post_init = qcom_pcie_host_post_init_2_7_0, .deinit = qcom_pcie_deinit_2_7_0, .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable, .config_sid = qcom_pcie_config_sid_1_9_0, @@ -1443,7 +1454,6 @@ static const struct qcom_pcie_ops ops_1_21_0 = { .get_resources = qcom_pcie_get_resources_2_7_0, .init = qcom_pcie_init_2_7_0, .post_init = qcom_pcie_post_init_2_7_0, - .host_post_init = qcom_pcie_host_post_init_2_7_0, .deinit = qcom_pcie_deinit_2_7_0, .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable, }; @@ -1740,6 +1750,8 @@ static int qcom_pcie_parse_ports(struct qcom_pcie *pcie) int ret = -ENOENT; for_each_available_child_of_node_scoped(dev->of_node, of_port) { + if (!of_node_is_type(of_port, "pci")) + continue; ret = qcom_pcie_parse_port(pcie, of_port); if (ret) goto err_port_del; @@ -1748,8 +1760,10 @@ static int qcom_pcie_parse_ports(struct qcom_pcie *pcie) return ret; err_port_del: - list_for_each_entry_safe(port, tmp, &pcie->ports, list) + list_for_each_entry_safe(port, tmp, &pcie->ports, list) { + phy_exit(port->phy); list_del(&port->list); + } return ret; } @@ -1757,20 +1771,32 @@ err_port_del: static int qcom_pcie_parse_legacy_binding(struct qcom_pcie *pcie) { struct device *dev = pcie->pci->dev; + struct qcom_pcie_port *port; + struct gpio_desc *reset; + struct phy *phy; int ret; - pcie->phy = devm_phy_optional_get(dev, "pciephy"); - if (IS_ERR(pcie->phy)) - return PTR_ERR(pcie->phy); + phy = devm_phy_optional_get(dev, "pciephy"); + if (IS_ERR(phy)) + return PTR_ERR(phy); - pcie->reset = devm_gpiod_get_optional(dev, "perst", GPIOD_OUT_HIGH); - if (IS_ERR(pcie->reset)) - return PTR_ERR(pcie->reset); + reset = devm_gpiod_get_optional(dev, "perst", GPIOD_OUT_HIGH); + if (IS_ERR(reset)) + return PTR_ERR(reset); - ret = phy_init(pcie->phy); + ret = phy_init(phy); if (ret) return ret; + port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL); + if (!port) + return -ENOMEM; + + port->reset = reset; + port->phy = phy; + INIT_LIST_HEAD(&port->list); + list_add_tail(&port->list, &pcie->ports); + return 0; } @@ -1861,12 +1887,6 @@ static int qcom_pcie_probe(struct platform_device *pdev) goto err_pm_runtime_put; } - pcie->elbi = devm_platform_ioremap_resource_byname(pdev, "elbi"); - if (IS_ERR(pcie->elbi)) { - ret = PTR_ERR(pcie->elbi); - goto err_pm_runtime_put; - } - /* MHI region is optional */ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mhi"); if (res) { @@ -1984,9 +2004,10 @@ static int qcom_pcie_probe(struct platform_device *pdev) err_host_deinit: dw_pcie_host_deinit(pp); err_phy_exit: - qcom_pcie_phy_exit(pcie); - list_for_each_entry_safe(port, tmp, &pcie->ports, list) + list_for_each_entry_safe(port, tmp, &pcie->ports, list) { + phy_exit(port->phy); list_del(&port->list); + } err_pm_runtime_put: pm_runtime_put(dev); pm_runtime_disable(dev); diff --git a/drivers/pci/controller/dwc/pcie-rcar-gen4.c b/drivers/pci/controller/dwc/pcie-rcar-gen4.c index 18055807a4f5..80778917d2dd 100644 --- a/drivers/pci/controller/dwc/pcie-rcar-gen4.c +++ b/drivers/pci/controller/dwc/pcie-rcar-gen4.c @@ -182,8 +182,17 @@ static int rcar_gen4_pcie_common_init(struct rcar_gen4_pcie *rcar) return ret; } - if (!reset_control_status(dw->core_rsts[DW_PCIE_PWR_RST].rstc)) + if (!reset_control_status(dw->core_rsts[DW_PCIE_PWR_RST].rstc)) { reset_control_assert(dw->core_rsts[DW_PCIE_PWR_RST].rstc); + /* + * R-Car V4H Reference Manual R19UH0186EJ0130 Rev.1.30 Apr. + * 21, 2025 page 585 Figure 9.3.2 Software Reset flow (B) + * indicates that for peripherals in HSC domain, after + * reset has been asserted by writing a matching reset bit + * into register SRCR, it is mandatory to wait 1ms. + */ + fsleep(1000); + } val = readl(rcar->base + PCIEMSR0); if (rcar->drvdata->mode == DW_PCIE_RC_TYPE) { @@ -204,6 +213,19 @@ static int rcar_gen4_pcie_common_init(struct rcar_gen4_pcie *rcar) if (ret) goto err_unprepare; + /* + * Assure the reset is latched and the core is ready for DBI access. + * On R-Car V4H, the PCIe reset is asynchronous and does not take + * effect immediately, but needs a short time to complete. In case + * DBI access happens in that short time, that access generates an + * SError. To make sure that condition can never happen, read back the + * state of the reset, which should turn the asynchronous reset into + * synchronous one, and wait a little over 1ms to add additional + * safety margin. + */ + reset_control_status(dw->core_rsts[DW_PCIE_PWR_RST].rstc); + fsleep(1000); + if (rcar->drvdata->additional_common_init) rcar->drvdata->additional_common_init(rcar); @@ -398,9 +420,7 @@ static int rcar_gen4_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no, } static const struct pci_epc_features rcar_gen4_pcie_epc_features = { - .linkup_notifier = false, .msi_capable = true, - .msix_capable = false, .bar[BAR_1] = { .type = BAR_RESERVED, }, .bar[BAR_3] = { .type = BAR_RESERVED, }, .bar[BAR_4] = { .type = BAR_FIXED, .fixed_size = 256 }, @@ -701,7 +721,7 @@ static int rcar_gen4_pcie_ltssm_control(struct rcar_gen4_pcie *rcar, bool enable rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x148, GENMASK(23, 22), BIT(22)); rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x148, GENMASK(18, 16), GENMASK(17, 16)); rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x148, GENMASK(7, 6), BIT(6)); - rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x148, GENMASK(2, 0), GENMASK(11, 0)); + rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x148, GENMASK(2, 0), GENMASK(1, 0)); rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x1d4, GENMASK(16, 15), GENMASK(16, 15)); rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x514, BIT(26), BIT(26)); rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x0f8, BIT(16), 0); @@ -711,7 +731,7 @@ static int rcar_gen4_pcie_ltssm_control(struct rcar_gen4_pcie *rcar, bool enable val &= ~APP_HOLD_PHY_RST; writel(val, rcar->base + PCIERSTCTRL1); - ret = readl_poll_timeout(rcar->phy_base + 0x0f8, val, !(val & BIT(18)), 100, 10000); + ret = readl_poll_timeout(rcar->phy_base + 0x0f8, val, val & BIT(18), 100, 10000); if (ret < 0) return ret; diff --git a/drivers/pci/controller/dwc/pcie-stm32-ep.c b/drivers/pci/controller/dwc/pcie-stm32-ep.c new file mode 100644 index 000000000000..3400c7cd2d88 --- /dev/null +++ b/drivers/pci/controller/dwc/pcie-stm32-ep.c @@ -0,0 +1,364 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * STMicroelectronics STM32MP25 PCIe endpoint driver. + * + * Copyright (C) 2025 STMicroelectronics + * Author: Christian Bruel <christian.bruel@foss.st.com> + */ + +#include <linux/clk.h> +#include <linux/mfd/syscon.h> +#include <linux/of_platform.h> +#include <linux/of_gpio.h> +#include <linux/phy/phy.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/regmap.h> +#include <linux/reset.h> +#include "pcie-designware.h" +#include "pcie-stm32.h" + +struct stm32_pcie { + struct dw_pcie pci; + struct regmap *regmap; + struct reset_control *rst; + struct phy *phy; + struct clk *clk; + struct gpio_desc *perst_gpio; + unsigned int perst_irq; +}; + +static void stm32_pcie_ep_init(struct dw_pcie_ep *ep) +{ + struct dw_pcie *pci = to_dw_pcie_from_ep(ep); + enum pci_barno bar; + + for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) + dw_pcie_ep_reset_bar(pci, bar); +} + +static int stm32_pcie_enable_link(struct dw_pcie *pci) +{ + struct stm32_pcie *stm32_pcie = to_stm32_pcie(pci); + + regmap_update_bits(stm32_pcie->regmap, SYSCFG_PCIECR, + STM32MP25_PCIECR_LTSSM_EN, + STM32MP25_PCIECR_LTSSM_EN); + + return dw_pcie_wait_for_link(pci); +} + +static void stm32_pcie_disable_link(struct dw_pcie *pci) +{ + struct stm32_pcie *stm32_pcie = to_stm32_pcie(pci); + + regmap_update_bits(stm32_pcie->regmap, SYSCFG_PCIECR, STM32MP25_PCIECR_LTSSM_EN, 0); +} + +static int stm32_pcie_start_link(struct dw_pcie *pci) +{ + struct stm32_pcie *stm32_pcie = to_stm32_pcie(pci); + int ret; + + dev_dbg(pci->dev, "Enable link\n"); + + ret = stm32_pcie_enable_link(pci); + if (ret) { + dev_err(pci->dev, "PCIe cannot establish link: %d\n", ret); + return ret; + } + + enable_irq(stm32_pcie->perst_irq); + + return 0; +} + +static void stm32_pcie_stop_link(struct dw_pcie *pci) +{ + struct stm32_pcie *stm32_pcie = to_stm32_pcie(pci); + + dev_dbg(pci->dev, "Disable link\n"); + + disable_irq(stm32_pcie->perst_irq); + + stm32_pcie_disable_link(pci); +} + +static int stm32_pcie_raise_irq(struct dw_pcie_ep *ep, u8 func_no, + unsigned int type, u16 interrupt_num) +{ + struct dw_pcie *pci = to_dw_pcie_from_ep(ep); + + switch (type) { + case PCI_IRQ_INTX: + return dw_pcie_ep_raise_intx_irq(ep, func_no); + case PCI_IRQ_MSI: + return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num); + default: + dev_err(pci->dev, "UNKNOWN IRQ type\n"); + return -EINVAL; + } +} + +static const struct pci_epc_features stm32_pcie_epc_features = { + .msi_capable = true, + .align = SZ_64K, +}; + +static const struct pci_epc_features* +stm32_pcie_get_features(struct dw_pcie_ep *ep) +{ + return &stm32_pcie_epc_features; +} + +static const struct dw_pcie_ep_ops stm32_pcie_ep_ops = { + .init = stm32_pcie_ep_init, + .raise_irq = stm32_pcie_raise_irq, + .get_features = stm32_pcie_get_features, +}; + +static const struct dw_pcie_ops dw_pcie_ops = { + .start_link = stm32_pcie_start_link, + .stop_link = stm32_pcie_stop_link, +}; + +static int stm32_pcie_enable_resources(struct stm32_pcie *stm32_pcie) +{ + int ret; + + ret = phy_init(stm32_pcie->phy); + if (ret) + return ret; + + ret = clk_prepare_enable(stm32_pcie->clk); + if (ret) + phy_exit(stm32_pcie->phy); + + return ret; +} + +static void stm32_pcie_disable_resources(struct stm32_pcie *stm32_pcie) +{ + clk_disable_unprepare(stm32_pcie->clk); + + phy_exit(stm32_pcie->phy); +} + +static void stm32_pcie_perst_assert(struct dw_pcie *pci) +{ + struct stm32_pcie *stm32_pcie = to_stm32_pcie(pci); + struct dw_pcie_ep *ep = &stm32_pcie->pci.ep; + struct device *dev = pci->dev; + + dev_dbg(dev, "PERST asserted by host\n"); + + pci_epc_deinit_notify(ep->epc); + + stm32_pcie_disable_resources(stm32_pcie); + + pm_runtime_put_sync(dev); +} + +static void stm32_pcie_perst_deassert(struct dw_pcie *pci) +{ + struct stm32_pcie *stm32_pcie = to_stm32_pcie(pci); + struct device *dev = pci->dev; + struct dw_pcie_ep *ep = &pci->ep; + int ret; + + dev_dbg(dev, "PERST de-asserted by host\n"); + + ret = pm_runtime_resume_and_get(dev); + if (ret < 0) { + dev_err(dev, "Failed to resume runtime PM: %d\n", ret); + return; + } + + ret = stm32_pcie_enable_resources(stm32_pcie); + if (ret) { + dev_err(dev, "Failed to enable resources: %d\n", ret); + goto err_pm_put_sync; + } + + /* + * Reprogram the configuration space registers here because the DBI + * registers were reset by the PHY RCC during phy_init(). + */ + ret = dw_pcie_ep_init_registers(ep); + if (ret) { + dev_err(dev, "Failed to complete initialization: %d\n", ret); + goto err_disable_resources; + } + + pci_epc_init_notify(ep->epc); + + return; + +err_disable_resources: + stm32_pcie_disable_resources(stm32_pcie); + +err_pm_put_sync: + pm_runtime_put_sync(dev); +} + +static irqreturn_t stm32_pcie_ep_perst_irq_thread(int irq, void *data) +{ + struct stm32_pcie *stm32_pcie = data; + struct dw_pcie *pci = &stm32_pcie->pci; + u32 perst; + + perst = gpiod_get_value(stm32_pcie->perst_gpio); + if (perst) + stm32_pcie_perst_assert(pci); + else + stm32_pcie_perst_deassert(pci); + + irq_set_irq_type(gpiod_to_irq(stm32_pcie->perst_gpio), + (perst ? IRQF_TRIGGER_HIGH : IRQF_TRIGGER_LOW)); + + return IRQ_HANDLED; +} + +static int stm32_add_pcie_ep(struct stm32_pcie *stm32_pcie, + struct platform_device *pdev) +{ + struct dw_pcie_ep *ep = &stm32_pcie->pci.ep; + struct device *dev = &pdev->dev; + int ret; + + ret = regmap_update_bits(stm32_pcie->regmap, SYSCFG_PCIECR, + STM32MP25_PCIECR_TYPE_MASK, + STM32MP25_PCIECR_EP); + if (ret) + return ret; + + reset_control_assert(stm32_pcie->rst); + reset_control_deassert(stm32_pcie->rst); + + ep->ops = &stm32_pcie_ep_ops; + + ret = dw_pcie_ep_init(ep); + if (ret) { + dev_err(dev, "Failed to initialize ep: %d\n", ret); + return ret; + } + + ret = stm32_pcie_enable_resources(stm32_pcie); + if (ret) { + dev_err(dev, "Failed to enable resources: %d\n", ret); + dw_pcie_ep_deinit(ep); + return ret; + } + + return 0; +} + +static int stm32_pcie_probe(struct platform_device *pdev) +{ + struct stm32_pcie *stm32_pcie; + struct device *dev = &pdev->dev; + int ret; + + stm32_pcie = devm_kzalloc(dev, sizeof(*stm32_pcie), GFP_KERNEL); + if (!stm32_pcie) + return -ENOMEM; + + stm32_pcie->pci.dev = dev; + stm32_pcie->pci.ops = &dw_pcie_ops; + + stm32_pcie->regmap = syscon_regmap_lookup_by_compatible("st,stm32mp25-syscfg"); + if (IS_ERR(stm32_pcie->regmap)) + return dev_err_probe(dev, PTR_ERR(stm32_pcie->regmap), + "No syscfg specified\n"); + + stm32_pcie->phy = devm_phy_get(dev, NULL); + if (IS_ERR(stm32_pcie->phy)) + return dev_err_probe(dev, PTR_ERR(stm32_pcie->phy), + "failed to get pcie-phy\n"); + + stm32_pcie->clk = devm_clk_get(dev, NULL); + if (IS_ERR(stm32_pcie->clk)) + return dev_err_probe(dev, PTR_ERR(stm32_pcie->clk), + "Failed to get PCIe clock source\n"); + + stm32_pcie->rst = devm_reset_control_get_exclusive(dev, NULL); + if (IS_ERR(stm32_pcie->rst)) + return dev_err_probe(dev, PTR_ERR(stm32_pcie->rst), + "Failed to get PCIe reset\n"); + + stm32_pcie->perst_gpio = devm_gpiod_get(dev, "reset", GPIOD_IN); + if (IS_ERR(stm32_pcie->perst_gpio)) + return dev_err_probe(dev, PTR_ERR(stm32_pcie->perst_gpio), + "Failed to get reset GPIO\n"); + + ret = phy_set_mode(stm32_pcie->phy, PHY_MODE_PCIE); + if (ret) + return ret; + + platform_set_drvdata(pdev, stm32_pcie); + + pm_runtime_get_noresume(dev); + + ret = devm_pm_runtime_enable(dev); + if (ret < 0) { + pm_runtime_put_noidle(&pdev->dev); + return dev_err_probe(dev, ret, "Failed to enable runtime PM\n"); + } + + stm32_pcie->perst_irq = gpiod_to_irq(stm32_pcie->perst_gpio); + + /* Will be enabled in start_link when device is initialized. */ + irq_set_status_flags(stm32_pcie->perst_irq, IRQ_NOAUTOEN); + + ret = devm_request_threaded_irq(dev, stm32_pcie->perst_irq, NULL, + stm32_pcie_ep_perst_irq_thread, + IRQF_TRIGGER_HIGH | IRQF_ONESHOT, + "perst_irq", stm32_pcie); + if (ret) { + pm_runtime_put_noidle(&pdev->dev); + return dev_err_probe(dev, ret, "Failed to request PERST IRQ\n"); + } + + ret = stm32_add_pcie_ep(stm32_pcie, pdev); + if (ret) + pm_runtime_put_noidle(&pdev->dev); + + return ret; +} + +static void stm32_pcie_remove(struct platform_device *pdev) +{ + struct stm32_pcie *stm32_pcie = platform_get_drvdata(pdev); + struct dw_pcie *pci = &stm32_pcie->pci; + struct dw_pcie_ep *ep = &pci->ep; + + dw_pcie_stop_link(pci); + + pci_epc_deinit_notify(ep->epc); + dw_pcie_ep_deinit(ep); + + stm32_pcie_disable_resources(stm32_pcie); + + pm_runtime_put_sync(&pdev->dev); +} + +static const struct of_device_id stm32_pcie_ep_of_match[] = { + { .compatible = "st,stm32mp25-pcie-ep" }, + {}, +}; + +static struct platform_driver stm32_pcie_ep_driver = { + .probe = stm32_pcie_probe, + .remove = stm32_pcie_remove, + .driver = { + .name = "stm32-ep-pcie", + .of_match_table = stm32_pcie_ep_of_match, + }, +}; + +module_platform_driver(stm32_pcie_ep_driver); + +MODULE_AUTHOR("Christian Bruel <christian.bruel@foss.st.com>"); +MODULE_DESCRIPTION("STM32MP25 PCIe Endpoint Controller driver"); +MODULE_LICENSE("GPL"); +MODULE_DEVICE_TABLE(of, stm32_pcie_ep_of_match); diff --git a/drivers/pci/controller/dwc/pcie-stm32.c b/drivers/pci/controller/dwc/pcie-stm32.c new file mode 100644 index 000000000000..96a5fb893af4 --- /dev/null +++ b/drivers/pci/controller/dwc/pcie-stm32.c @@ -0,0 +1,358 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * STMicroelectronics STM32MP25 PCIe root complex driver. + * + * Copyright (C) 2025 STMicroelectronics + * Author: Christian Bruel <christian.bruel@foss.st.com> + */ + +#include <linux/clk.h> +#include <linux/mfd/syscon.h> +#include <linux/of_platform.h> +#include <linux/phy/phy.h> +#include <linux/pinctrl/consumer.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/pm_wakeirq.h> +#include <linux/regmap.h> +#include <linux/reset.h> +#include "pcie-designware.h" +#include "pcie-stm32.h" +#include "../../pci.h" + +struct stm32_pcie { + struct dw_pcie pci; + struct regmap *regmap; + struct reset_control *rst; + struct phy *phy; + struct clk *clk; + struct gpio_desc *perst_gpio; + struct gpio_desc *wake_gpio; +}; + +static void stm32_pcie_deassert_perst(struct stm32_pcie *stm32_pcie) +{ + if (stm32_pcie->perst_gpio) { + msleep(PCIE_T_PVPERL_MS); + gpiod_set_value(stm32_pcie->perst_gpio, 0); + } + + msleep(PCIE_RESET_CONFIG_WAIT_MS); +} + +static void stm32_pcie_assert_perst(struct stm32_pcie *stm32_pcie) +{ + gpiod_set_value(stm32_pcie->perst_gpio, 1); +} + +static int stm32_pcie_start_link(struct dw_pcie *pci) +{ + struct stm32_pcie *stm32_pcie = to_stm32_pcie(pci); + + return regmap_update_bits(stm32_pcie->regmap, SYSCFG_PCIECR, + STM32MP25_PCIECR_LTSSM_EN, + STM32MP25_PCIECR_LTSSM_EN); +} + +static void stm32_pcie_stop_link(struct dw_pcie *pci) +{ + struct stm32_pcie *stm32_pcie = to_stm32_pcie(pci); + + regmap_update_bits(stm32_pcie->regmap, SYSCFG_PCIECR, + STM32MP25_PCIECR_LTSSM_EN, 0); +} + +static int stm32_pcie_suspend_noirq(struct device *dev) +{ + struct stm32_pcie *stm32_pcie = dev_get_drvdata(dev); + int ret; + + ret = dw_pcie_suspend_noirq(&stm32_pcie->pci); + if (ret) + return ret; + + stm32_pcie_assert_perst(stm32_pcie); + + clk_disable_unprepare(stm32_pcie->clk); + + if (!device_wakeup_path(dev)) + phy_exit(stm32_pcie->phy); + + return pinctrl_pm_select_sleep_state(dev); +} + +static int stm32_pcie_resume_noirq(struct device *dev) +{ + struct stm32_pcie *stm32_pcie = dev_get_drvdata(dev); + int ret; + + /* + * The core clock is gated with CLKREQ# from the COMBOPHY REFCLK, + * thus if no device is present, must deassert it with a GPIO from + * pinctrl pinmux before accessing the DBI registers. + */ + ret = pinctrl_pm_select_init_state(dev); + if (ret) { + dev_err(dev, "Failed to activate pinctrl pm state: %d\n", ret); + return ret; + } + + if (!device_wakeup_path(dev)) { + ret = phy_init(stm32_pcie->phy); + if (ret) { + pinctrl_pm_select_default_state(dev); + return ret; + } + } + + ret = clk_prepare_enable(stm32_pcie->clk); + if (ret) + goto err_phy_exit; + + stm32_pcie_deassert_perst(stm32_pcie); + + ret = dw_pcie_resume_noirq(&stm32_pcie->pci); + if (ret) + goto err_disable_clk; + + pinctrl_pm_select_default_state(dev); + + return 0; + +err_disable_clk: + stm32_pcie_assert_perst(stm32_pcie); + clk_disable_unprepare(stm32_pcie->clk); + +err_phy_exit: + phy_exit(stm32_pcie->phy); + pinctrl_pm_select_default_state(dev); + + return ret; +} + +static const struct dev_pm_ops stm32_pcie_pm_ops = { + NOIRQ_SYSTEM_SLEEP_PM_OPS(stm32_pcie_suspend_noirq, + stm32_pcie_resume_noirq) +}; + +static const struct dw_pcie_host_ops stm32_pcie_host_ops = { +}; + +static const struct dw_pcie_ops dw_pcie_ops = { + .start_link = stm32_pcie_start_link, + .stop_link = stm32_pcie_stop_link +}; + +static int stm32_add_pcie_port(struct stm32_pcie *stm32_pcie) +{ + struct device *dev = stm32_pcie->pci.dev; + unsigned int wake_irq; + int ret; + + ret = phy_set_mode(stm32_pcie->phy, PHY_MODE_PCIE); + if (ret) + return ret; + + ret = phy_init(stm32_pcie->phy); + if (ret) + return ret; + + ret = regmap_update_bits(stm32_pcie->regmap, SYSCFG_PCIECR, + STM32MP25_PCIECR_TYPE_MASK, + STM32MP25_PCIECR_RC); + if (ret) + goto err_phy_exit; + + stm32_pcie_deassert_perst(stm32_pcie); + + if (stm32_pcie->wake_gpio) { + wake_irq = gpiod_to_irq(stm32_pcie->wake_gpio); + ret = dev_pm_set_dedicated_wake_irq(dev, wake_irq); + if (ret) { + dev_err(dev, "Failed to enable wakeup irq %d\n", ret); + goto err_assert_perst; + } + irq_set_irq_type(wake_irq, IRQ_TYPE_EDGE_FALLING); + } + + return 0; + +err_assert_perst: + stm32_pcie_assert_perst(stm32_pcie); + +err_phy_exit: + phy_exit(stm32_pcie->phy); + + return ret; +} + +static void stm32_remove_pcie_port(struct stm32_pcie *stm32_pcie) +{ + dev_pm_clear_wake_irq(stm32_pcie->pci.dev); + + stm32_pcie_assert_perst(stm32_pcie); + + phy_exit(stm32_pcie->phy); +} + +static int stm32_pcie_parse_port(struct stm32_pcie *stm32_pcie) +{ + struct device *dev = stm32_pcie->pci.dev; + struct device_node *root_port; + + root_port = of_get_next_available_child(dev->of_node, NULL); + + stm32_pcie->phy = devm_of_phy_get(dev, root_port, NULL); + if (IS_ERR(stm32_pcie->phy)) { + of_node_put(root_port); + return dev_err_probe(dev, PTR_ERR(stm32_pcie->phy), + "Failed to get pcie-phy\n"); + } + + stm32_pcie->perst_gpio = devm_fwnode_gpiod_get(dev, of_fwnode_handle(root_port), + "reset", GPIOD_OUT_HIGH, NULL); + if (IS_ERR(stm32_pcie->perst_gpio)) { + if (PTR_ERR(stm32_pcie->perst_gpio) != -ENOENT) { + of_node_put(root_port); + return dev_err_probe(dev, PTR_ERR(stm32_pcie->perst_gpio), + "Failed to get reset GPIO\n"); + } + stm32_pcie->perst_gpio = NULL; + } + + stm32_pcie->wake_gpio = devm_fwnode_gpiod_get(dev, of_fwnode_handle(root_port), + "wake", GPIOD_IN, NULL); + + if (IS_ERR(stm32_pcie->wake_gpio)) { + if (PTR_ERR(stm32_pcie->wake_gpio) != -ENOENT) { + of_node_put(root_port); + return dev_err_probe(dev, PTR_ERR(stm32_pcie->wake_gpio), + "Failed to get wake GPIO\n"); + } + stm32_pcie->wake_gpio = NULL; + } + + of_node_put(root_port); + + return 0; +} + +static int stm32_pcie_probe(struct platform_device *pdev) +{ + struct stm32_pcie *stm32_pcie; + struct device *dev = &pdev->dev; + int ret; + + stm32_pcie = devm_kzalloc(dev, sizeof(*stm32_pcie), GFP_KERNEL); + if (!stm32_pcie) + return -ENOMEM; + + stm32_pcie->pci.dev = dev; + stm32_pcie->pci.ops = &dw_pcie_ops; + stm32_pcie->pci.pp.ops = &stm32_pcie_host_ops; + + stm32_pcie->regmap = syscon_regmap_lookup_by_compatible("st,stm32mp25-syscfg"); + if (IS_ERR(stm32_pcie->regmap)) + return dev_err_probe(dev, PTR_ERR(stm32_pcie->regmap), + "No syscfg specified\n"); + + stm32_pcie->clk = devm_clk_get(dev, NULL); + if (IS_ERR(stm32_pcie->clk)) + return dev_err_probe(dev, PTR_ERR(stm32_pcie->clk), + "Failed to get PCIe clock source\n"); + + stm32_pcie->rst = devm_reset_control_get_exclusive(dev, NULL); + if (IS_ERR(stm32_pcie->rst)) + return dev_err_probe(dev, PTR_ERR(stm32_pcie->rst), + "Failed to get PCIe reset\n"); + + ret = stm32_pcie_parse_port(stm32_pcie); + if (ret) + return ret; + + platform_set_drvdata(pdev, stm32_pcie); + + ret = stm32_add_pcie_port(stm32_pcie); + if (ret) + return ret; + + reset_control_assert(stm32_pcie->rst); + reset_control_deassert(stm32_pcie->rst); + + ret = clk_prepare_enable(stm32_pcie->clk); + if (ret) { + dev_err(dev, "Core clock enable failed %d\n", ret); + goto err_remove_port; + } + + ret = pm_runtime_set_active(dev); + if (ret < 0) { + dev_err_probe(dev, ret, "Failed to activate runtime PM\n"); + goto err_disable_clk; + } + + pm_runtime_no_callbacks(dev); + + ret = devm_pm_runtime_enable(dev); + if (ret < 0) { + dev_err_probe(dev, ret, "Failed to enable runtime PM\n"); + goto err_disable_clk; + } + + ret = dw_pcie_host_init(&stm32_pcie->pci.pp); + if (ret) + goto err_disable_clk; + + if (stm32_pcie->wake_gpio) + device_init_wakeup(dev, true); + + return 0; + +err_disable_clk: + clk_disable_unprepare(stm32_pcie->clk); + +err_remove_port: + stm32_remove_pcie_port(stm32_pcie); + + return ret; +} + +static void stm32_pcie_remove(struct platform_device *pdev) +{ + struct stm32_pcie *stm32_pcie = platform_get_drvdata(pdev); + struct dw_pcie_rp *pp = &stm32_pcie->pci.pp; + + if (stm32_pcie->wake_gpio) + device_init_wakeup(&pdev->dev, false); + + dw_pcie_host_deinit(pp); + + clk_disable_unprepare(stm32_pcie->clk); + + stm32_remove_pcie_port(stm32_pcie); + + pm_runtime_put_noidle(&pdev->dev); +} + +static const struct of_device_id stm32_pcie_of_match[] = { + { .compatible = "st,stm32mp25-pcie-rc" }, + {}, +}; + +static struct platform_driver stm32_pcie_driver = { + .probe = stm32_pcie_probe, + .remove = stm32_pcie_remove, + .driver = { + .name = "stm32-pcie", + .of_match_table = stm32_pcie_of_match, + .pm = &stm32_pcie_pm_ops, + .probe_type = PROBE_PREFER_ASYNCHRONOUS, + }, +}; + +module_platform_driver(stm32_pcie_driver); + +MODULE_AUTHOR("Christian Bruel <christian.bruel@foss.st.com>"); +MODULE_DESCRIPTION("STM32MP25 PCIe Controller driver"); +MODULE_LICENSE("GPL"); +MODULE_DEVICE_TABLE(of, stm32_pcie_of_match); diff --git a/drivers/pci/controller/dwc/pcie-stm32.h b/drivers/pci/controller/dwc/pcie-stm32.h new file mode 100644 index 000000000000..09d39f04e469 --- /dev/null +++ b/drivers/pci/controller/dwc/pcie-stm32.h @@ -0,0 +1,16 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * ST PCIe driver definitions for STM32-MP25 SoC + * + * Copyright (C) 2025 STMicroelectronics - All Rights Reserved + * Author: Christian Bruel <christian.bruel@foss.st.com> + */ + +#define to_stm32_pcie(x) dev_get_drvdata((x)->dev) + +#define STM32MP25_PCIECR_TYPE_MASK GENMASK(11, 8) +#define STM32MP25_PCIECR_EP 0 +#define STM32MP25_PCIECR_LTSSM_EN BIT(2) +#define STM32MP25_PCIECR_RC BIT(10) + +#define SYSCFG_PCIECR 0x6000 diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c index 4f26086f25da..10e74458e667 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -1214,6 +1214,7 @@ static int tegra_pcie_bpmp_set_ctrl_state(struct tegra_pcie_dw *pcie, struct mrq_uphy_response resp; struct tegra_bpmp_message msg; struct mrq_uphy_request req; + int err; /* * Controller-5 doesn't need to have its state set by BPMP-FW in @@ -1236,7 +1237,13 @@ static int tegra_pcie_bpmp_set_ctrl_state(struct tegra_pcie_dw *pcie, msg.rx.data = &resp; msg.rx.size = sizeof(resp); - return tegra_bpmp_transfer(pcie->bpmp, &msg); + err = tegra_bpmp_transfer(pcie->bpmp, &msg); + if (err) + return err; + if (msg.rx.ret) + return -EINVAL; + + return 0; } static int tegra_pcie_bpmp_set_pll_state(struct tegra_pcie_dw *pcie, @@ -1245,6 +1252,7 @@ static int tegra_pcie_bpmp_set_pll_state(struct tegra_pcie_dw *pcie, struct mrq_uphy_response resp; struct tegra_bpmp_message msg; struct mrq_uphy_request req; + int err; memset(&req, 0, sizeof(req)); memset(&resp, 0, sizeof(resp)); @@ -1264,13 +1272,19 @@ static int tegra_pcie_bpmp_set_pll_state(struct tegra_pcie_dw *pcie, msg.rx.data = &resp; msg.rx.size = sizeof(resp); - return tegra_bpmp_transfer(pcie->bpmp, &msg); + err = tegra_bpmp_transfer(pcie->bpmp, &msg); + if (err) + return err; + if (msg.rx.ret) + return -EINVAL; + + return 0; } static void tegra_pcie_downstream_dev_to_D0(struct tegra_pcie_dw *pcie) { struct dw_pcie_rp *pp = &pcie->pci.pp; - struct pci_bus *child, *root_bus = NULL; + struct pci_bus *child, *root_port_bus = NULL; struct pci_dev *pdev; /* @@ -1283,19 +1297,19 @@ static void tegra_pcie_downstream_dev_to_D0(struct tegra_pcie_dw *pcie) */ list_for_each_entry(child, &pp->bridge->bus->children, node) { - /* Bring downstream devices to D0 if they are not already in */ if (child->parent == pp->bridge->bus) { - root_bus = child; + root_port_bus = child; break; } } - if (!root_bus) { - dev_err(pcie->dev, "Failed to find downstream devices\n"); + if (!root_port_bus) { + dev_err(pcie->dev, "Failed to find downstream bus of Root Port\n"); return; } - list_for_each_entry(pdev, &root_bus->devices, bus_list) { + /* Bring downstream devices to D0 if they are not already in */ + list_for_each_entry(pdev, &root_port_bus->devices, bus_list) { if (PCI_SLOT(pdev->devfn) == 0) { if (pci_set_power_state(pdev, PCI_D0)) dev_err(pcie->dev, @@ -1722,9 +1736,9 @@ static void pex_ep_event_pex_rst_assert(struct tegra_pcie_dw *pcie) ret); } - ret = tegra_pcie_bpmp_set_pll_state(pcie, false); + ret = tegra_pcie_bpmp_set_ctrl_state(pcie, false); if (ret) - dev_err(pcie->dev, "Failed to turn off UPHY: %d\n", ret); + dev_err(pcie->dev, "Failed to disable controller: %d\n", ret); pcie->ep_state = EP_STATE_DISABLED; dev_dbg(pcie->dev, "Uninitialization of endpoint is completed\n"); @@ -1941,6 +1955,15 @@ static irqreturn_t tegra_pcie_ep_pex_rst_irq(int irq, void *arg) return IRQ_HANDLED; } +static void tegra_pcie_ep_init(struct dw_pcie_ep *ep) +{ + struct dw_pcie *pci = to_dw_pcie_from_ep(ep); + enum pci_barno bar; + + for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) + dw_pcie_ep_reset_bar(pci, bar); +}; + static int tegra_pcie_ep_raise_intx_irq(struct tegra_pcie_dw *pcie, u16 irq) { /* Tegra194 supports only INTA */ @@ -1955,10 +1978,10 @@ static int tegra_pcie_ep_raise_intx_irq(struct tegra_pcie_dw *pcie, u16 irq) static int tegra_pcie_ep_raise_msi_irq(struct tegra_pcie_dw *pcie, u16 irq) { - if (unlikely(irq > 31)) + if (unlikely(irq > 32)) return -EINVAL; - appl_writel(pcie, BIT(irq), APPL_MSI_CTRL_1); + appl_writel(pcie, BIT(irq - 1), APPL_MSI_CTRL_1); return 0; } @@ -1998,8 +2021,7 @@ static int tegra_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no, static const struct pci_epc_features tegra_pcie_epc_features = { .linkup_notifier = true, - .msi_capable = false, - .msix_capable = false, + .msi_capable = true, .bar[BAR_0] = { .type = BAR_FIXED, .fixed_size = SZ_1M, .only_64bit = true, }, .bar[BAR_1] = { .type = BAR_RESERVED, }, @@ -2017,6 +2039,7 @@ tegra_pcie_ep_get_features(struct dw_pcie_ep *ep) } static const struct dw_pcie_ep_ops pcie_ep_ops = { + .init = tegra_pcie_ep_init, .raise_irq = tegra_pcie_ep_raise_irq, .get_features = tegra_pcie_ep_get_features, }; |