On Fri, Apr 17, 2020 at 06:27:51PM +0530, Kishon Vijay Abraham I wrote: > Add support for PCIe controller in J721E SoC. The controller uses the > Cadence PCIe core programmed by pcie-cadence*.c. The PCIe controller > will work in both host mode and device mode. > Some of the features of the controller are: > *) Supports both RC mode and EP mode > *) Supports MSI and MSI-X support > *) Supports upto GEN3 speed mode > *) Supports SR-IOV capability > *) Ability to route all transactions via SMMU (support will be added > in a later patch). > > Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx> > --- > drivers/pci/controller/cadence/Kconfig | 23 + > drivers/pci/controller/cadence/Makefile | 1 + > drivers/pci/controller/cadence/pci-j721e.c | 500 ++++++++++++++++++ > .../controller/cadence/pcie-cadence-host.c | 4 +- > drivers/pci/controller/cadence/pcie-cadence.h | 8 + > 5 files changed, 534 insertions(+), 2 deletions(-) > create mode 100644 drivers/pci/controller/cadence/pci-j721e.c > > diff --git a/drivers/pci/controller/cadence/Kconfig b/drivers/pci/controller/cadence/Kconfig > index b76b3cf55ce5..5d30564190e1 100644 > --- a/drivers/pci/controller/cadence/Kconfig > +++ b/drivers/pci/controller/cadence/Kconfig > @@ -42,4 +42,27 @@ config PCIE_CADENCE_PLAT_EP > endpoint mode. This PCIe controller may be embedded into many > different vendors SoCs. > > +config PCI_J721E > + bool > + > +config PCI_J721E_HOST > + bool "TI J721E PCIe platform host controller" > + depends on OF > + select PCIE_CADENCE_HOST > + select PCI_J721E > + help > + Say Y here if you want to support the TI J721E PCIe platform > + controller in host mode. TI J721E PCIe controller uses Cadence PCIe > + core. > + > +config PCI_J721E_EP > + bool "TI J721E PCIe platform endpoint controller" > + depends on OF > + depends on PCI_ENDPOINT > + select PCIE_CADENCE_EP > + select PCI_J721E > + help > + Say Y here if you want to support the TI J721E PCIe platform > + controller in endpoint mode. TI J721E PCIe controller uses Cadence PCIe > + core. > endmenu > diff --git a/drivers/pci/controller/cadence/Makefile b/drivers/pci/controller/cadence/Makefile > index 232a3f20876a..9bac5fb2f13d 100644 > --- a/drivers/pci/controller/cadence/Makefile > +++ b/drivers/pci/controller/cadence/Makefile > @@ -3,3 +3,4 @@ obj-$(CONFIG_PCIE_CADENCE) += pcie-cadence.o > obj-$(CONFIG_PCIE_CADENCE_HOST) += pcie-cadence-host.o > obj-$(CONFIG_PCIE_CADENCE_EP) += pcie-cadence-ep.o > obj-$(CONFIG_PCIE_CADENCE_PLAT) += pcie-cadence-plat.o > +obj-$(CONFIG_PCI_J721E) += pci-j721e.o > diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c > new file mode 100644 > index 000000000000..eee619c6ffae > --- /dev/null > +++ b/drivers/pci/controller/cadence/pci-j721e.c > @@ -0,0 +1,500 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/** > + * pci-j721e - PCIe controller driver for TI's J721E SoCs > + * > + * Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com > + * Author: Kishon Vijay Abraham I <kishon@xxxxxx> > + */ > + > +#include <linux/delay.h> > +#include <linux/gpio/consumer.h> > +#include <linux/io.h> > +#include <linux/irqchip/chained_irq.h> > +#include <linux/irqdomain.h> > +#include <linux/mfd/syscon.h> > +#include <linux/of_device.h> > +#include <linux/of_irq.h> > +#include <linux/pci.h> > +#include <linux/pm_runtime.h> > +#include <linux/regmap.h> > + > +#include "../../pci.h" > +#include "pcie-cadence.h" > + > +#define ENABLE_REG_SYS_2 0x108 > +#define STATUS_REG_SYS_2 0x508 > +#define STATUS_CLR_REG_SYS_2 0x708 > +#define LINK_DOWN BIT(1) > + > +#define J721E_PCIE_USER_CMD_STATUS 0x4 > +#define LINK_TRAINING_ENABLE BIT(0) > + > +#define J721E_PCIE_USER_LINKSTATUS 0x14 > +#define LINK_STATUS GENMASK(1, 0) > + > +enum link_status { > + NO_RECEIVERS_DETECTED, > + LINK_TRAINING_IN_PROGRESS, > + LINK_UP_DL_IN_PROGRESS, > + LINK_UP_DL_COMPLETED, > +}; > + > +#define J721E_MODE_RC BIT(7) > +#define LANE_COUNT_MASK BIT(8) > +#define LANE_COUNT(n) ((n) << 8) > + > +#define GENERATION_SEL_MASK GENMASK(1, 0) > + > +#define MAX_LANES 2 > + > +struct j721e_pcie { > + struct device *dev; > + struct device_node *node; > + u32 mode; > + u32 num_lanes; > + struct cdns_pcie *cdns_pcie; > + void __iomem *user_cfg_base; > + void __iomem *intd_cfg_base; > +}; > + > +enum j721e_pcie_mode { > + PCI_MODE_RC, > + PCI_MODE_EP, > +}; > + > +struct j721e_pcie_data { > + enum j721e_pcie_mode mode; > +}; > + > +static inline u32 j721e_pcie_user_readl(struct j721e_pcie *pcie, u32 offset) > +{ > + return readl(pcie->user_cfg_base + offset); > +} > + > +static inline void j721e_pcie_user_writel(struct j721e_pcie *pcie, u32 offset, > + u32 value) > +{ > + writel(value, pcie->user_cfg_base + offset); > +} > + > +static inline u32 j721e_pcie_intd_readl(struct j721e_pcie *pcie, u32 offset) > +{ > + return readl(pcie->intd_cfg_base + offset); > +} > + > +static inline void j721e_pcie_intd_writel(struct j721e_pcie *pcie, u32 offset, > + u32 value) > +{ > + writel(value, pcie->intd_cfg_base + offset); > +} > + > +static irqreturn_t j721e_pcie_link_irq_handler(int irq, void *priv) > +{ > + struct j721e_pcie *pcie = priv; > + struct device *dev = pcie->dev; > + u32 reg; > + > + reg = j721e_pcie_intd_readl(pcie, STATUS_REG_SYS_2); > + if (!(reg & LINK_DOWN)) > + return IRQ_NONE; > + > + dev_err(dev, "LINK DOWN!\n"); > + > + j721e_pcie_intd_writel(pcie, STATUS_CLR_REG_SYS_2, LINK_DOWN); > + return IRQ_HANDLED; > +} > + > +static void j721e_pcie_config_link_irq(struct j721e_pcie *pcie) > +{ > + u32 reg; > + > + reg = j721e_pcie_intd_readl(pcie, ENABLE_REG_SYS_2); > + reg |= LINK_DOWN; > + j721e_pcie_intd_writel(pcie, ENABLE_REG_SYS_2, reg); > +} > + > +static int j721e_pcie_start_link(struct cdns_pcie *cdns_pcie) > +{ > + struct j721e_pcie *pcie = dev_get_drvdata(cdns_pcie->dev); > + u32 reg; > + > + reg = j721e_pcie_user_readl(pcie, J721E_PCIE_USER_CMD_STATUS); > + reg |= LINK_TRAINING_ENABLE; > + j721e_pcie_user_writel(pcie, J721E_PCIE_USER_CMD_STATUS, reg); > + > + return 0; > +} > + > +static void j721e_pcie_stop_link(struct cdns_pcie *cdns_pcie) > +{ > + struct j721e_pcie *pcie = dev_get_drvdata(cdns_pcie->dev); > + u32 reg; > + > + reg = j721e_pcie_user_readl(pcie, J721E_PCIE_USER_CMD_STATUS); > + reg &= ~LINK_TRAINING_ENABLE; > + j721e_pcie_user_writel(pcie, J721E_PCIE_USER_CMD_STATUS, reg); > +} > + > +static bool j721e_pcie_link_up(struct cdns_pcie *cdns_pcie) > +{ > + struct j721e_pcie *pcie = dev_get_drvdata(cdns_pcie->dev); > + u32 reg; > + > + reg = j721e_pcie_user_readl(pcie, J721E_PCIE_USER_LINKSTATUS); > + reg &= LINK_STATUS; > + if (reg == LINK_UP_DL_COMPLETED) > + return true; > + > + return false; > +} > + > +static const struct cdns_pcie_ops j721e_ops_ops = { > + .read = cdns_platform_pcie_read32, > + .write = cdns_platform_pcie_write32, > + .start_link = j721e_pcie_start_link, > + .stop_link = j721e_pcie_stop_link, > + .link_up = j721e_pcie_link_up, > +}; > + > +static int j721e_pcie_set_mode(struct j721e_pcie *pcie, struct regmap *syscon) > +{ > + struct device *dev = pcie->dev; > + u32 mask = J721E_MODE_RC; > + u32 mode = pcie->mode; > + u32 val = 0; > + int ret = 0; > + > + if (mode == PCI_MODE_RC) > + val = J721E_MODE_RC; > + > + ret = regmap_update_bits(syscon, 0, mask, val); > + if (ret) > + dev_err(dev, "failed to set pcie mode\n"); > + > + return ret; > +} > + > +static int j721e_pcie_set_link_speed(struct j721e_pcie *pcie, > + struct regmap *syscon) > +{ > + struct device *dev = pcie->dev; > + struct device_node *np = dev->of_node; > + int link_speed; > + u32 val = 0; > + int ret; > + > + link_speed = of_pci_get_max_link_speed(np); > + if (link_speed < 2) > + link_speed = 2; > + > + val = link_speed - 1; > + ret = regmap_update_bits(syscon, 0, GENERATION_SEL_MASK, val); > + if (ret) > + dev_err(dev, "failed to set link speed\n"); > + > + return ret; > +} > + > +static int j721e_pcie_set_lane_count(struct j721e_pcie *pcie, > + struct regmap *syscon) > +{ > + struct device *dev = pcie->dev; > + u32 lanes = pcie->num_lanes; > + u32 val = 0; > + int ret; > + > + val = LANE_COUNT(lanes - 1); > + ret = regmap_update_bits(syscon, 0, LANE_COUNT_MASK, val); > + if (ret) > + dev_err(dev, "failed to set link count\n"); > + > + return ret; > +} > + > +static int j721e_pcie_ctrl_init(struct j721e_pcie *pcie) > +{ > + struct device *dev = pcie->dev; > + struct device_node *node = dev->of_node; > + struct regmap *syscon; > + int ret; > + > + syscon = syscon_regmap_lookup_by_phandle(node, "ti,syscon-pcie-ctrl"); > + if (IS_ERR(syscon)) { > + dev_err(dev, "Unable to get ti,syscon-pcie-ctrl regmap\n"); > + return PTR_ERR(syscon); > + } > + > + ret = j721e_pcie_set_mode(pcie, syscon); > + if (ret < 0) { > + dev_err(dev, "Failed to set pci mode\n"); > + return ret; > + } > + > + ret = j721e_pcie_set_link_speed(pcie, syscon); > + if (ret < 0) { > + dev_err(dev, "Failed to set link speed\n"); > + return ret; > + } > + > + ret = j721e_pcie_set_lane_count(pcie, syscon); > + if (ret < 0) { > + dev_err(dev, "Failed to set num-lanes\n"); > + return ret; > + } > + > + return 0; > +} > + > +static int cdns_ti_pcie_config_read(struct pci_bus *bus, unsigned int devfn, > + int where, int size, u32 *value) > +{ > + struct pci_host_bridge *bridge = pci_find_host_bridge(bus); > + struct cdns_pcie_rc *rc = pci_host_bridge_priv(bridge); > + unsigned int busn = bus->number; > + > + if (busn == rc->bus_range->start) > + return pci_generic_config_read32(bus, devfn, where, size, > + value); > + > + return pci_generic_config_read(bus, devfn, where, size, value); > +} > + > +static int cdns_ti_pcie_config_write(struct pci_bus *bus, unsigned int devfn, > + int where, int size, u32 value) > +{ > + struct pci_host_bridge *bridge = pci_find_host_bridge(bus); > + struct cdns_pcie_rc *rc = pci_host_bridge_priv(bridge); > + unsigned int busn = bus->number; > + > + if (busn == rc->bus_range->start) > + return pci_generic_config_write32(bus, devfn, where, size, > + value); > + > + return pci_generic_config_write(bus, devfn, where, size, value); > +} > + > +static struct pci_ops cdns_ti_pcie_host_ops = { > + .map_bus = cdns_pci_map_bus, > + .read = cdns_ti_pcie_config_read, > + .write = cdns_ti_pcie_config_write, > +}; > + > +static const struct j721e_pcie_data j721e_pcie_rc_data = { > + .mode = PCI_MODE_RC, > +}; > + > +static const struct j721e_pcie_data j721e_pcie_ep_data = { > + .mode = PCI_MODE_EP, > +}; > + > +static const struct of_device_id of_j721e_pcie_match[] = { > + { > + .compatible = "ti,j721e-pcie-host", > + .data = &j721e_pcie_rc_data, > + }, > + { > + .compatible = "ti,j721e-pcie-ep", > + .data = &j721e_pcie_ep_data, > + }, > + {}, > +}; > + > +static int j721e_pcie_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct device_node *node = dev->of_node; > + const struct of_device_id *match; > + struct pci_host_bridge *bridge; > + struct j721e_pcie_data *data; > + struct cdns_pcie *cdns_pcie; > + struct j721e_pcie *pcie; > + struct cdns_pcie_rc *rc; > + struct cdns_pcie_ep *ep; > + struct gpio_desc *gpiod; > + struct resource *res; > + void __iomem *base; > + u32 num_lanes; > + u32 mode; > + int ret; > + int irq; > + > + match = of_match_device(of_match_ptr(of_j721e_pcie_match), dev); > + if (!match) > + return -EINVAL; > + > + data = (struct j721e_pcie_data *)match->data; Use of_device_get_match_data() > + mode = (u32)data->mode; > + > + pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL); > + if (!pcie) > + return -ENOMEM; > + > + pcie->dev = dev; > + pcie->node = node; The dev has the node, why do you need it twice? > + pcie->mode = mode; > + > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "intd_cfg"); > + base = devm_ioremap_resource(dev, res); devm_platform_ioremap_resource_byname() > + if (IS_ERR(base)) > + return PTR_ERR(base); > + pcie->intd_cfg_base = base; > + > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "user_cfg"); > + base = devm_ioremap_resource(dev, res); devm_platform_ioremap_resource_byname > + if (IS_ERR(base)) > + return PTR_ERR(base); > + pcie->user_cfg_base = base; > + > + ret = of_property_read_u32(node, "num-lanes", &num_lanes); > + if (ret || num_lanes > MAX_LANES) > + num_lanes = 1; > + pcie->num_lanes = num_lanes; > + > + irq = platform_get_irq_byname(pdev, "link_state"); > + if (irq < 0) > + return irq; > + > + dev_set_drvdata(dev, pcie); > + pm_runtime_enable(dev); > + ret = pm_runtime_get_sync(dev); > + if (ret < 0) { > + dev_err(dev, "pm_runtime_get_sync failed\n"); > + goto err_get_sync; > + } > + > + ret = j721e_pcie_ctrl_init(pcie); > + if (ret < 0) { > + dev_err(dev, "pm_runtime_get_sync failed\n"); > + goto err_get_sync; > + } > + > + ret = devm_request_irq(dev, irq, j721e_pcie_link_irq_handler, > + IRQF_SHARED, "j721e-pcie-link_state-irq", pcie); Really shared? > + if (ret < 0) { > + dev_err(dev, "failed to request link state IRQ %d\n", irq); > + goto err_get_sync; > + } > + > + j721e_pcie_config_link_irq(pcie); > + > + switch (mode) { > + case PCI_MODE_RC: > + if (!IS_ENABLED(CONFIG_PCIE_CADENCE_HOST)) { > + ret = -ENODEV; > + goto err_get_sync; > + } > + > + bridge = devm_pci_alloc_host_bridge(dev, sizeof(*rc)); > + if (!bridge) { > + ret = -ENOMEM; > + goto err_get_sync; > + } > + > + bridge->ops = &cdns_ti_pcie_host_ops; > + rc = pci_host_bridge_priv(bridge); > + > + cdns_pcie = &rc->pcie; > + cdns_pcie->dev = dev; > + cdns_pcie->ops = &j721e_ops_ops; > + pcie->cdns_pcie = cdns_pcie; > + > + gpiod = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); > + if (IS_ERR(gpiod)) { > + ret = PTR_ERR(gpiod); > + if (ret != -EPROBE_DEFER) > + dev_err(dev, "Failed to get reset GPIO\n"); > + goto err_get_sync; > + } > + > + ret = cdns_pcie_init_phy(dev, cdns_pcie); > + if (ret) { > + dev_err(dev, "Failed to init phy\n"); > + goto err_get_sync; > + } > + > + /* > + * "Power Sequencing and Reset Signal Timings" table in > + * PCI EXPRESS CARD ELECTROMECHANICAL SPECIFICATION, REV. 3.0 > + * indicates PERST# should be deasserted after minimum of 100us > + * once REFCLK is stable. The REFCLK to the connector in RC > + * mode is selected while enabling the PHY. So deassert PERST# > + * after 100 us. > + */ > + if (gpiod) { > + usleep_range(100, 200); > + gpiod_set_value_cansleep(gpiod, 1); > + } > + > + ret = cdns_pcie_host_setup(rc); > + if (ret < 0) > + goto err_pcie_setup; > + > + break; > + case PCI_MODE_EP: > + if (!IS_ENABLED(CONFIG_PCIE_CADENCE_EP)) { > + ret = -ENODEV; > + goto err_get_sync; > + } > + > + ep = devm_kzalloc(dev, sizeof(*ep), GFP_KERNEL); > + if (!ep) { > + ret = -ENOMEM; > + goto err_get_sync; > + } > + > + cdns_pcie = &ep->pcie; > + cdns_pcie->dev = dev; > + cdns_pcie->ops = &j721e_ops_ops; > + pcie->cdns_pcie = cdns_pcie; > + > + ret = cdns_pcie_init_phy(dev, cdns_pcie); > + if (ret) { > + dev_err(dev, "Failed to init phy\n"); > + goto err_get_sync; > + } > + > + ret = cdns_pcie_ep_setup(ep); > + if (ret < 0) > + goto err_pcie_setup; > + > + break; > + default: > + dev_err(dev, "INVALID device type %d\n", mode); > + } > + > + return 0; > + > +err_pcie_setup: > + cdns_pcie_disable_phy(cdns_pcie); > + > +err_get_sync: > + pm_runtime_put(dev); > + pm_runtime_disable(dev); > + > + return ret; > +} > + > +static int j721e_pcie_remove(struct platform_device *pdev) > +{ > + struct j721e_pcie *pcie = platform_get_drvdata(pdev); > + struct cdns_pcie *cdns_pcie = pcie->cdns_pcie; > + struct device *dev = &pdev->dev; > + > + cdns_pcie_disable_phy(cdns_pcie); > + pm_runtime_put(dev); > + pm_runtime_disable(dev); > + of_platform_depopulate(dev); I don't see a populate. Is this supposed to be here? > + > + return 0; > +} > + > +static struct platform_driver j721e_pcie_driver = { > + .probe = j721e_pcie_probe, > + .remove = j721e_pcie_remove, > + .driver = { > + .name = "j721e-pcie", > + .of_match_table = of_j721e_pcie_match, > + .suppress_bind_attrs = true, > + }, > +}; > +builtin_platform_driver(j721e_pcie_driver); > diff --git a/drivers/pci/controller/cadence/pcie-cadence-host.c b/drivers/pci/controller/cadence/pcie-cadence-host.c > index c7dc7be0da40..d7cc7ea4fba3 100644 > --- a/drivers/pci/controller/cadence/pcie-cadence-host.c > +++ b/drivers/pci/controller/cadence/pcie-cadence-host.c > @@ -11,8 +11,8 @@ > > #include "pcie-cadence.h" > > -static void __iomem *cdns_pci_map_bus(struct pci_bus *bus, unsigned int devfn, > - int where) > +void __iomem *cdns_pci_map_bus(struct pci_bus *bus, unsigned int devfn, > + int where) > { > struct pci_host_bridge *bridge = pci_find_host_bridge(bus); > struct cdns_pcie_rc *rc = pci_host_bridge_priv(bridge); > diff --git a/drivers/pci/controller/cadence/pcie-cadence.h b/drivers/pci/controller/cadence/pcie-cadence.h > index ea850290a602..f349f5828a58 100644 > --- a/drivers/pci/controller/cadence/pcie-cadence.h > +++ b/drivers/pci/controller/cadence/pcie-cadence.h > @@ -488,11 +488,19 @@ static inline bool cdns_pcie_link_up(struct cdns_pcie *pcie) > > #ifdef CONFIG_PCIE_CADENCE_HOST > int cdns_pcie_host_setup(struct cdns_pcie_rc *rc); > +void __iomem *cdns_pci_map_bus(struct pci_bus *bus, unsigned int devfn, > + int where); > #else > static inline int cdns_pcie_host_setup(struct cdns_pcie_rc *rc) > { > return 0; > } > + > +static void __iomem *cdns_pci_map_bus(struct pci_bus *bus, unsigned int devfn, > + int where) > +{ > + return NULL; > +} > #endif > > #ifdef CONFIG_PCIE_CADENCE_EP > -- > 2.17.1 >
