Add PCIe controller drvier for HiSilicon STB SoCs, the controller is based on the DesignWare's PCIe core.
Signed-off-by: Ruqiang Ju <[email protected]> --- .../bindings/pci/hisilicon-histb-pcie.txt | 66 +++ drivers/pci/host/Kconfig | 8 + drivers/pci/host/Makefile | 1 + drivers/pci/host/pcie-histb.c | 448 +++++++++++++++++++++ 4 files changed, 523 insertions(+) create mode 100644 Documentation/devicetree/bindings/pci/hisilicon-histb-pcie.txt create mode 100644 drivers/pci/host/pcie-histb.c diff --git a/Documentation/devicetree/bindings/pci/hisilicon-histb-pcie.txt b/Documentation/devicetree/bindings/pci/hisilicon-histb-pcie.txt new file mode 100644 index 0000000..952f1db --- /dev/null +++ b/Documentation/devicetree/bindings/pci/hisilicon-histb-pcie.txt @@ -0,0 +1,66 @@ +HiSilicon STB PCIe host bridge DT description + +HiSilicon PCIe host controller is based on Designware PCI core. +It shares common functions with PCIe Designware core driver and inherits +common properties defined in +Documentation/devicetree/bindings/pci/designware-pci.txt. + +Additional properties are described here: + +Required properties +- compatible: Should be one of the following strings + "hisilicon,histb-pcie", + "hisilicon,hi3798cv200-pcie" +- reg: Should contain sysctl, rc_dbi, config registers location and length. +- reg-names: Must include the following entries: + "sysctrl": system control registers of PCIe controller; + "rc_dbi": configuration space of PCIe controller; + "config": configuration transaction space of PCIe controller. +- interrupts: MSI interrupt. +- interrupt-names: Must include "msi" entries. +- clocks: List of phandle and clock specifier pairs as listed + in clock-names property. +- clock-name: Must include the following entries: + "aux_clk": auxiliary gate clock; + "pipe_clk": pipe gate clock; + "sys_clk": sys gate clock; + "bus_clk": bus gate clock. +- resets: List of phandle and reset specifier pairs as listed + in reset-names property +- reset-names: Must include the following entries: + "soft_reset": soft reset; + "sys_reset": sys reset; + "bus_rest": bus reset. + +Optional properties: +- power-gpios: pcie device power control gpio if needed; +- power-gpios-active-high: must include this propty + if active level is high. +- status: Either "ok" or "disabled". + +Example: + pcie@f9860000 { + compatible = "hisilicon,histb-pcie", "snps,dw-pcie"; + reg = <0xf9860000 0x1000>, + <0xf0000000 0x2000>, + <0xf2000000 0x01000000>; + reg-names = "sysctrl", "rc_dbi", "config"; + #address-cells = <3>; + #size-cells = <2>; + device_type = "pci"; + num-lanes = <1>; + ranges=<0x81000000 0 0 0xf4000000 0 0x00010000 + 0x82000000 0 0xf3000000 0xf3000000 0 0x01000000>; + interrupts = <GIC_SPI 128 IRQ_TYPE_LEVEL_HIGH>; + interrupt-names = "msi"; + #interrupt-cells = <1>; + interrupt-map-mask = <0 0 0 7>; + interrupt-map = <0x0 0 0 1 &gic 0 131 4>; + clocks = <&crg PCIE_AUX_CLK>, + <&crg PCIE_PIPE_CLK>, + <&crg PCIE_SYS_CLK>, + <&crg PCIE_BUS_CLK>; + clock-names = "aux_clk", "pipe_clk", "sys_clk", "bus_clk"; + resets = <&crg 0x18c 6>, <&crg 0x18c 5>, <&crg 0x18c 4>; + reset-names = "soft_reset", "sys_reset", "bus_reset"; + }; diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig index d7e7c0a..57ce4df 100644 --- a/drivers/pci/host/Kconfig +++ b/drivers/pci/host/Kconfig @@ -227,6 +227,14 @@ config PCI_HISI Say Y here if you want PCIe controller support on HiSilicon Hip05 and Hip06 SoCs +config PCIE_HISI_STB + depends on OF + bool "HiSilicon STB SoCs PCIe controllers" + select PCIEPORTBUS + select PCIE_DW + help + Say Y here if you want PCIe controller support on HiSilicon STB SoCs + config PCIE_QCOM bool "Qualcomm PCIe controller" depends on ARCH_QCOM && OF diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile index 084cb49..55f4fe7 100644 --- a/drivers/pci/host/Makefile +++ b/drivers/pci/host/Makefile @@ -26,6 +26,7 @@ obj-$(CONFIG_PCIE_IPROC_BCMA) += pcie-iproc-bcma.o obj-$(CONFIG_PCIE_ALTERA) += pcie-altera.o obj-$(CONFIG_PCIE_ALTERA_MSI) += pcie-altera-msi.o obj-$(CONFIG_PCI_HISI) += pcie-hisi.o +obj-$(CONFIG_PCIE_HISI_STB) += pcie-histb.o obj-$(CONFIG_PCIE_QCOM) += pcie-qcom.o obj-$(CONFIG_PCI_HOST_THUNDER_ECAM) += pci-thunder-ecam.o obj-$(CONFIG_PCI_HOST_THUNDER_PEM) += pci-thunder-pem.o diff --git a/drivers/pci/host/pcie-histb.c b/drivers/pci/host/pcie-histb.c new file mode 100644 index 0000000..71e344f --- /dev/null +++ b/drivers/pci/host/pcie-histb.c @@ -0,0 +1,448 @@ +/* + * PCIe host controller driver for HiSilicon STB SoCs + * + * Copyright (C) 2016 HiSilicon Co., Ltd. http://www.hisilicon.com + * + * Authors: RuQiang Ju <[email protected]> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_gpio.h> +#include <linux/pci.h> +#include <linux/platform_device.h> +#include <linux/resource.h> +#include <linux/reset.h> + +#include "pcie-designware.h" + +#define PCIE_SYS_CTRL0 0x0000 +#define PCIE_SYS_CTRL1 0x0004 +#define PCIE_SYS_CTRL7 0x001C +#define PCIE_SYS_CTRL13 0x0034 +#define PCIE_SYS_CTRL15 0x003c +#define PCIE_SYS_CTRL16 0x0040 +#define PCIE_SYS_CTRL17 0x0044 + +#define PCIE_SYS_STAT0 0x0100 +#define PCIE_SYS_STAT4 0x0110 + +#define PCIE_RDLH_LINK_UP BIT(5) +#define PCIE_XMLH_LINK_UP BIT(15) +#define PCIE_ELBI_SLV_DBI_ENABLE BIT(21) +#define PCIE_APP_LTSSM_ENABLE BIT(11) + +#define PCIE_DEVICE_TYPE_MASK GENMASK(31, 28) +#define PCIE_WM_EP 0 +#define PCIE_WM_LEGACY BIT(1) +#define PCIE_WM_RC BIT(30) + +#define PCIE_LTSSM_STATE_MASK GENMASK(5, 0) +#define PCIE_LTSSM_STATE_ACTIVE 0x11 + +struct histb_pcie_host { + void __iomem *sysctrl; + int power_gpio; + bool gpio_active_high; + struct clk *aux_clk; + struct clk *pipe_clk; + struct clk *sys_clk; + struct clk *bus_clk; + struct reset_control *soft_reset; + struct reset_control *sys_reset; + struct reset_control *bus_reset; + struct pcie_port pp; +}; + +#define to_histb_pcie(x) container_of(x, struct histb_pcie_host, pp) + +static void histb_pcie_dbi_w_mode(struct pcie_port *pp, bool enable) +{ + struct histb_pcie_host *hipcie = to_histb_pcie(pp); + u32 val; + + if (enable) { + val = readl(hipcie->sysctrl + PCIE_SYS_CTRL0); + val |= PCIE_ELBI_SLV_DBI_ENABLE; + writel(val, hipcie->sysctrl + PCIE_SYS_CTRL0); + } else { + val = readl(hipcie->sysctrl + PCIE_SYS_CTRL0); + val &= ~PCIE_ELBI_SLV_DBI_ENABLE; + writel(val, hipcie->sysctrl + PCIE_SYS_CTRL0); + } +} + +static void histb_pcie_dbi_r_mode(struct pcie_port *pp, bool enable) +{ + struct histb_pcie_host *hipcie = to_histb_pcie(pp); + u32 val; + + if (enable) { + val = readl(hipcie->sysctrl + PCIE_SYS_CTRL1); + val |= PCIE_ELBI_SLV_DBI_ENABLE; + writel(val, hipcie->sysctrl + PCIE_SYS_CTRL1); + } else { + val = readl(hipcie->sysctrl + PCIE_SYS_CTRL1); + val &= ~PCIE_ELBI_SLV_DBI_ENABLE; + writel(val, hipcie->sysctrl + PCIE_SYS_CTRL1); + } +} + +static inline u32 histb_pcie_readl_rc(struct pcie_port *pp, u32 reg) +{ + u32 val; + + histb_pcie_dbi_r_mode(pp, true); + val = readl(pp->dbi_base + reg); + histb_pcie_dbi_r_mode(pp, false); + + return val; +} + +static inline void histb_pcie_writel_rc(struct pcie_port *pp, + u32 reg, u32 val) +{ + histb_pcie_dbi_w_mode(pp, true); + writel(val, pp->dbi_base + reg); + histb_pcie_dbi_w_mode(pp, false); +} + +static int histb_pcie_rd_own_conf(struct pcie_port *pp, + int where, int size, u32 *val) +{ + int ret; + + histb_pcie_dbi_r_mode(pp, true); + ret = dw_pcie_cfg_read(pp->dbi_base + where, size, val); + histb_pcie_dbi_r_mode(pp, false); + + return ret; +} + +static int histb_pcie_wr_own_conf(struct pcie_port *pp, + int where, int size, u32 val) +{ + int ret; + + histb_pcie_dbi_w_mode(pp, true); + ret = dw_pcie_cfg_write(pp->dbi_base + where, size, val); + histb_pcie_dbi_w_mode(pp, false); + + return ret; +} + +static int histb_pcie_link_up(struct pcie_port *pp) +{ + struct histb_pcie_host *hipcie = to_histb_pcie(pp); + u32 regval; + u32 status; + + regval = readl(hipcie->sysctrl + PCIE_SYS_STAT0); + status = readl(hipcie->sysctrl + PCIE_SYS_STAT4); + status &= PCIE_LTSSM_STATE_MASK; + if ((regval & PCIE_XMLH_LINK_UP) && + (regval & PCIE_RDLH_LINK_UP) && + (status == PCIE_LTSSM_STATE_ACTIVE)) + return 1; + + return 0; +} + +static int histb_pcie_establish_link(struct pcie_port *pp) +{ + struct histb_pcie_host *hipcie = to_histb_pcie(pp); + u32 regval; + int count = 0; + + if (dw_pcie_link_up(pp)) { + dev_err(pp->dev, "Link already up\n"); + return 0; + } + + /* PCIe RC work mode */ + regval = readl(hipcie->sysctrl + PCIE_SYS_CTRL0); + regval &= ~PCIE_DEVICE_TYPE_MASK; + regval |= PCIE_WM_RC; + writel(regval, hipcie->sysctrl + PCIE_SYS_CTRL0); + + /* setup root complex */ + dw_pcie_setup_rc(pp); + + /* assert LTSSM enable */ + regval = readl(hipcie->sysctrl + PCIE_SYS_CTRL7); + regval |= PCIE_APP_LTSSM_ENABLE; + writel(regval, hipcie->sysctrl + PCIE_SYS_CTRL7); + + /* check if the link is up or not */ + while (!dw_pcie_link_up(pp)) { + mdelay(10); + count++; + if (count == 50) { + dev_err(pp->dev, "PCIe Link Fail\n"); + return -EINVAL; + } + } + + dev_info(pp->dev, "Link up\n"); + + return 0; +} + +static void histb_pcie_host_init(struct pcie_port *pp) +{ + histb_pcie_establish_link(pp); + + if (IS_ENABLED(CONFIG_PCI_MSI)) + dw_pcie_msi_init(pp); +} + +static struct pcie_host_ops histb_pcie_host_ops = { + .readl_rc = histb_pcie_readl_rc, + .writel_rc = histb_pcie_writel_rc, + .rd_own_conf = histb_pcie_rd_own_conf, + .wr_own_conf = histb_pcie_wr_own_conf, + .link_up = histb_pcie_link_up, + .host_init = histb_pcie_host_init, +}; + +#ifdef CONFIG_PCI_MSI +static irqreturn_t histb_pcie_msi_irq_handler(int irq, void *arg) +{ + struct pcie_port *pp = arg; + + return dw_handle_msi_irq(pp); +} +#endif + +static void histb_pcie_host_disable(struct histb_pcie_host *hipcie) +{ + reset_control_assert(hipcie->soft_reset); + reset_control_assert(hipcie->sys_reset); + reset_control_assert(hipcie->bus_reset); + + clk_disable_unprepare(hipcie->aux_clk); + clk_disable_unprepare(hipcie->pipe_clk); + clk_disable_unprepare(hipcie->sys_clk); + clk_disable_unprepare(hipcie->bus_clk); + + if (gpio_is_valid(hipcie->power_gpio)) + gpio_set_value_cansleep(hipcie->power_gpio, + !hipcie->gpio_active_high); +} + +static int histb_pcie_host_enable(struct pcie_port *pp) +{ + struct histb_pcie_host *hipcie = to_histb_pcie(pp); + struct device *dev = pp->dev; + int ret; + + /* power on pcie device if have */ + if (gpio_is_valid(hipcie->power_gpio)) + gpio_set_value_cansleep(hipcie->power_gpio, + hipcie->gpio_active_high); + + ret = clk_prepare_enable(hipcie->bus_clk); + if (ret) { + dev_err(dev, "cannot prepare/enable bus_clk\n"); + goto err_bus_clk; + } + ret = clk_prepare_enable(hipcie->sys_clk); + if (ret) { + dev_err(dev, "cannot prepare/enable sys_clk\n"); + goto err_sys_clk; + } + ret = clk_prepare_enable(hipcie->pipe_clk); + if (ret) { + dev_err(dev, "cannot prepare/enable pipe_clk\n"); + goto err_pipe_clk; + } + ret = clk_prepare_enable(hipcie->aux_clk); + if (ret) { + dev_err(dev, "cannot prepare/enable aux_clk\n"); + goto err_aux_clk; + } + + reset_control_assert(hipcie->soft_reset); + reset_control_deassert(hipcie->soft_reset); + + reset_control_assert(hipcie->sys_reset); + reset_control_deassert(hipcie->sys_reset); + + reset_control_assert(hipcie->bus_reset); + reset_control_deassert(hipcie->bus_reset); + + return 0; + +err_aux_clk: + clk_disable_unprepare(hipcie->aux_clk); +err_pipe_clk: + clk_disable_unprepare(hipcie->pipe_clk); +err_sys_clk: + clk_disable_unprepare(hipcie->sys_clk); +err_bus_clk: + clk_disable_unprepare(hipcie->bus_clk); + + return ret; +} + + +static int histb_pcie_probe(struct platform_device *pdev) +{ + struct histb_pcie_host *hipcie; + struct pcie_port *pp; + struct resource *res; + struct device_node *np = pdev->dev.of_node; + struct device *dev = &pdev->dev; + int ret; + + hipcie = devm_kzalloc(dev, sizeof(*hipcie), GFP_KERNEL); + if (!hipcie) + return -ENOMEM; + + pp = &hipcie->pp; + pp->dev = dev; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sysctrl"); + hipcie->sysctrl = devm_ioremap_resource(dev, res); + if (IS_ERR(hipcie->sysctrl)) { + dev_err(dev, "cannot get sysctrl base\n"); + return PTR_ERR(hipcie->sysctrl); + } + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rc_dbi"); + pp->dbi_base = devm_ioremap_resource(dev, res); + if (IS_ERR(pp->dbi_base)) { + dev_err(dev, "cannot get rc_dbi base\n"); + return PTR_ERR(pp->dbi_base); + } + + hipcie->power_gpio = of_get_named_gpio(np, "power-gpios", 0); + hipcie->gpio_active_high = of_property_read_bool(np, + "power-gpios-active-high"); + if (gpio_is_valid(hipcie->power_gpio)) { + ret = devm_gpio_request_one(dev, hipcie->power_gpio, + hipcie->gpio_active_high ? + GPIOF_OUT_INIT_HIGH : + GPIOF_OUT_INIT_LOW, + "PCIe Dev power"); + if (ret) { + dev_err(dev, "unable to request gpio\n"); + return ret; + } + } + + hipcie->aux_clk = devm_clk_get(dev, "aux_clk"); + if (IS_ERR(hipcie->aux_clk)) { + dev_err(dev, "Failed to get pcie aux_clk clock\n"); + return PTR_ERR(hipcie->aux_clk); + } + + hipcie->pipe_clk = devm_clk_get(dev, "pipe_clk"); + if (IS_ERR(hipcie->pipe_clk)) { + dev_err(dev, "Failed to get pcie pipe_clk clock\n"); + return PTR_ERR(hipcie->pipe_clk); + } + + hipcie->sys_clk = devm_clk_get(dev, "sys_clk"); + if (IS_ERR(hipcie->sys_clk)) { + dev_err(dev, "Failed to get pcie sys_clk clock\n"); + return PTR_ERR(hipcie->sys_clk); + } + + hipcie->bus_clk = devm_clk_get(dev, "bus_clk"); + if (IS_ERR(hipcie->bus_clk)) { + dev_err(dev, "Failed to get pcie bus_clk clock\n"); + return PTR_ERR(hipcie->bus_clk); + } + + hipcie->soft_reset = devm_reset_control_get(dev, "soft_reset"); + if (IS_ERR(hipcie->soft_reset)) { + dev_err(dev, "couldn't get soft_reset\n"); + return PTR_ERR(hipcie->soft_reset); + } + + hipcie->sys_reset = devm_reset_control_get(dev, "sys_reset"); + if (IS_ERR(hipcie->sys_reset)) { + dev_err(dev, "couldn't get sys_reset\n"); + return PTR_ERR(hipcie->sys_reset); + } + + hipcie->bus_reset = devm_reset_control_get(dev, "bus_reset"); + if (IS_ERR(hipcie->bus_reset)) { + dev_err(dev, "couldn't get bus_reset\n"); + return PTR_ERR(hipcie->bus_reset); + } + + if (IS_ENABLED(CONFIG_PCI_MSI)) { + pp->msi_irq = platform_get_irq_byname(pdev, "msi"); + if (pp->msi_irq < 0) { + dev_err(dev, "Failed to get msi irq\n"); + return pp->msi_irq; + } + ret = devm_request_irq(dev, pp->msi_irq, + histb_pcie_msi_irq_handler, + IRQF_SHARED, "histb-pcie-msi", pp); + if (ret) { + dev_err(dev, "cannot request msi irq\n"); + return ret; + } + } + + pp->root_bus_nr = -1; + pp->ops = &histb_pcie_host_ops; + + ret = histb_pcie_host_enable(pp); + if (ret) { + dev_err(dev, "failed to enable host\n"); + return ret; + } + + ret = dw_pcie_host_init(pp); + if (ret) { + dev_err(dev, "failed to initialize host\n"); + return ret; + } + + platform_set_drvdata(pdev, hipcie); + + return 0; +} + +static int histb_pcie_remove(struct platform_device *pdev) +{ + struct histb_pcie_host *hipcie = platform_get_drvdata(pdev); + + histb_pcie_host_disable(hipcie); + + return 0; +} + +static const struct of_device_id histb_pcie_of_match[] = { + { .compatible = "hisilicon,histb-pcie", }, + { .compatible = "hisilicon,hi3798cv200-pcie", }, + {}, +}; + +MODULE_DEVICE_TABLE(of, histb_pcie_of_match); + +static struct platform_driver histb_pcie_platform_driver = { + .probe = histb_pcie_probe, + .remove = histb_pcie_remove, + .driver = { + .name = "histb-pcie", + .of_match_table = of_match_ptr(histb_pcie_of_match), + }, +}; + +module_platform_driver(histb_pcie_platform_driver); + +MODULE_AUTHOR("RuQiang Ju <[email protected]>"); +MODULE_DESCRIPTION("HiSilicon STB PCIe host controller driver"); +MODULE_LICENSE("GPL v2"); -- 1.9.1
