| Message ID | 1508757470-22631-1-git-send-email-shawnguo@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On Mon, Oct 23, 2017 at 07:17:50PM +0800, Shawn Guo wrote: > From: Jianguo Sun <sunjianguo1@huawei.com> > > Add PCIe controller driver for HiSilicon STB SoCs, > the controller is based on the DesignWare PCIe core. > > Signed-off-by: Jianguo Sun <sunjianguo1@huawei.com> > Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Applied to pci/host-hisi for v4.15, thanks! > --- > Changes for v2: > - Add a MAINTAINERS entry for the driver. > - Unify the spell of DesignWare and PCIe in text and messages. > - Use "MSI IRQ" in message output. > - Fix the indentation of function parameters on newline. > - Fix interrupt-map for legacy interrupts in bindings example. > > .../bindings/pci/hisilicon-histb-pcie.txt | 68 +++ > MAINTAINERS | 8 + > drivers/pci/dwc/Kconfig | 10 + > drivers/pci/dwc/Makefile | 1 + > drivers/pci/dwc/pcie-histb.c | 469 +++++++++++++++++++++ > 5 files changed, 556 insertions(+) > create mode 100644 Documentation/devicetree/bindings/pci/hisilicon-histb-pcie.txt > create mode 100644 drivers/pci/dwc/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 000000000000..e4d79d03214b > --- /dev/null > +++ b/Documentation/devicetree/bindings/pci/hisilicon-histb-pcie.txt > @@ -0,0 +1,68 @@ > +HiSilicon STB PCIe host bridge DT description > + > +HiSilicon STB PCIe host controller is based on DesignWare PCIe core. > +It shares common functions with PCIe DesignWare core driver and inherits > +common properties defined in > +Documentation/devicetree/bindings/pci/designware-pcie.txt. > + > +Additional properties are described here: > + > +Required properties > +- compatible: Should be one of the following strings: > + "hisilicon,hi3798cv200-pcie" > +- reg: Should contain sysctl, rc_dbi, config registers location and length. > +- reg-names: Must include the following entries: > + "control": control registers of PCIe controller; > + "rc-dbi": configuration space of PCIe controller; > + "config": configuration transaction space of PCIe controller. > +- bus-range: PCI bus numbers covered. > +- 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": auxiliary gate clock; > + "pipe": pipe gate clock; > + "sys": sys gate clock; > + "bus": 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": soft reset; > + "sys": sys reset; > + "bus": bus reset. > + > +Optional properties: > +- reset-gpios: The gpio to generate PCIe PERST# assert and deassert signal. > +- phys: List of phandle and phy mode specifier, should be 0. > +- phy-names: Must be "phy". > + > +Example: > + pcie@f9860000 { > + compatible = "hisilicon,hi3798cv200-pcie"; > + reg = <0xf9860000 0x1000>, > + <0xf0000000 0x2000>, > + <0xf2000000 0x01000000>; > + reg-names = "control", "rc-dbi", "config"; > + #address-cells = <3>; > + #size-cells = <2>; > + device_type = "pci"; > + bus-range = <0 15>; > + 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 0>; > + interrupt-map = <0 0 0 0 &gic GIC_SPI 131 IRQ_TYPE_LEVEL_HIGH>; > + clocks = <&crg PCIE_AUX_CLK>, > + <&crg PCIE_PIPE_CLK>, > + <&crg PCIE_SYS_CLK>, > + <&crg PCIE_BUS_CLK>; > + clock-names = "aux", "pipe", "sys", "bus"; > + resets = <&crg 0x18c 6>, <&crg 0x18c 5>, <&crg 0x18c 4>; > + reset-names = "soft", "sys", "bus"; > + phys = <&combphy1 PHY_TYPE_PCIE>; > + phy-names = "phy"; > + }; > diff --git a/MAINTAINERS b/MAINTAINERS > index a74227ad082e..2520bf02bc12 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -10487,6 +10487,14 @@ S: Maintained > F: Documentation/devicetree/bindings/pci/pcie-kirin.txt > F: drivers/pci/dwc/pcie-kirin.c > > +PCIE DRIVER FOR HISILICON STB > +M: Jianguo Sun <sunjianguo1@huawei.com> > +M: Shawn Guo <shawn.guo@linaro.org> > +L: linux-pci@vger.kernel.org > +S: Maintained > +F: Documentation/devicetree/bindings/pci/hisilicon-histb-pcie.txt > +F: drivers/pci/dwc/pcie-histb.c > + > PCIE DRIVER FOR MEDIATEK > M: Ryder Lee <ryder.lee@mediatek.com> > L: linux-pci@vger.kernel.org > diff --git a/drivers/pci/dwc/Kconfig b/drivers/pci/dwc/Kconfig > index 22ec82fcdea2..113e09440f85 100644 > --- a/drivers/pci/dwc/Kconfig > +++ b/drivers/pci/dwc/Kconfig > @@ -169,4 +169,14 @@ config PCIE_KIRIN > Say Y here if you want PCIe controller support > on HiSilicon Kirin series SoCs. > > +config PCIE_HISI_STB > + bool "HiSilicon STB SoCs PCIe controllers" > + depends on ARCH_HISI > + depends on PCI > + depends on PCI_MSI_IRQ_DOMAIN > + select PCIEPORTBUS > + select PCIE_DW_HOST > + help > + Say Y here if you want PCIe controller support on HiSilicon STB SoCs > + > endmenu > diff --git a/drivers/pci/dwc/Makefile b/drivers/pci/dwc/Makefile > index c61be9738cce..54f56f6e9236 100644 > --- a/drivers/pci/dwc/Makefile > +++ b/drivers/pci/dwc/Makefile > @@ -14,6 +14,7 @@ obj-$(CONFIG_PCIE_QCOM) += pcie-qcom.o > obj-$(CONFIG_PCIE_ARMADA_8K) += pcie-armada8k.o > obj-$(CONFIG_PCIE_ARTPEC6) += pcie-artpec6.o > obj-$(CONFIG_PCIE_KIRIN) += pcie-kirin.o > +obj-$(CONFIG_PCIE_HISI_STB) += pcie-histb.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/dwc/pcie-histb.c b/drivers/pci/dwc/pcie-histb.c > new file mode 100644 > index 000000000000..d41ed01e3415 > --- /dev/null > +++ b/drivers/pci/dwc/pcie-histb.c > @@ -0,0 +1,469 @@ > +/* > + * PCIe host controller driver for HiSilicon STB SoCs > + * > + * Copyright (C) 2016-2017 HiSilicon Co., Ltd. http://www.hisilicon.com > + * > + * Authors: Ruqiang Ju <juruqiang@hisilicon.com> > + * Jianguo Sun <sunjianguo1@huawei.com> > + * > + * 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/phy/phy.h> > +#include <linux/platform_device.h> > +#include <linux/resource.h> > +#include <linux/reset.h> > + > +#include "pcie-designware.h" > + > +#define to_histb_pcie(x) dev_get_drvdata((x)->dev) > + > +#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 { > + struct dw_pcie *pci; > + struct clk *aux_clk; > + struct clk *pipe_clk; > + struct clk *sys_clk; > + struct clk *bus_clk; > + struct phy *phy; > + struct reset_control *soft_reset; > + struct reset_control *sys_reset; > + struct reset_control *bus_reset; > + void __iomem *ctrl; > + int reset_gpio; > +}; > + > +static u32 histb_pcie_readl(struct histb_pcie *histb_pcie, u32 reg) > +{ > + return readl(histb_pcie->ctrl + reg); > +} > + > +static void histb_pcie_writel(struct histb_pcie *histb_pcie, u32 reg, u32 val) > +{ > + writel(val, histb_pcie->ctrl + reg); > +} > + > +static void histb_pcie_dbi_w_mode(struct pcie_port *pp, bool enable) > +{ > + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); > + struct histb_pcie *hipcie = to_histb_pcie(pci); > + u32 val; > + > + val = histb_pcie_readl(hipcie, PCIE_SYS_CTRL0); > + if (enable) > + val |= PCIE_ELBI_SLV_DBI_ENABLE; > + else > + val &= ~PCIE_ELBI_SLV_DBI_ENABLE; > + histb_pcie_writel(hipcie, PCIE_SYS_CTRL0, val); > +} > + > +static void histb_pcie_dbi_r_mode(struct pcie_port *pp, bool enable) > +{ > + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); > + struct histb_pcie *hipcie = to_histb_pcie(pci); > + u32 val; > + > + val = histb_pcie_readl(hipcie, PCIE_SYS_CTRL1); > + if (enable) > + val |= PCIE_ELBI_SLV_DBI_ENABLE; > + else > + val &= ~PCIE_ELBI_SLV_DBI_ENABLE; > + histb_pcie_writel(hipcie, PCIE_SYS_CTRL1, val); > +} > + > +static u32 histb_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base, > + u32 reg, size_t size) > +{ > + u32 val; > + > + histb_pcie_dbi_r_mode(&pci->pp, true); > + dw_pcie_read(base + reg, size, &val); > + histb_pcie_dbi_r_mode(&pci->pp, false); > + > + return val; > +} > + > +static void histb_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base, > + u32 reg, size_t size, u32 val) > +{ > + histb_pcie_dbi_w_mode(&pci->pp, true); > + dw_pcie_write(base + reg, size, val); > + histb_pcie_dbi_w_mode(&pci->pp, false); > +} > + > +static int histb_pcie_rd_own_conf(struct pcie_port *pp, int where, > + int size, u32 *val) > +{ > + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); > + int ret; > + > + histb_pcie_dbi_r_mode(pp, true); > + ret = dw_pcie_read(pci->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) > +{ > + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); > + int ret; > + > + histb_pcie_dbi_w_mode(pp, true); > + ret = dw_pcie_write(pci->dbi_base + where, size, val); > + histb_pcie_dbi_w_mode(pp, false); > + > + return ret; > +} > + > +static int histb_pcie_link_up(struct dw_pcie *pci) > +{ > + struct histb_pcie *hipcie = to_histb_pcie(pci); > + u32 regval; > + u32 status; > + > + regval = histb_pcie_readl(hipcie, PCIE_SYS_STAT0); > + status = histb_pcie_readl(hipcie, 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 dw_pcie *pci = to_dw_pcie_from_pp(pp); > + struct histb_pcie *hipcie = to_histb_pcie(pci); > + u32 regval; > + > + if (dw_pcie_link_up(pci)) { > + dev_info(pci->dev, "Link already up\n"); > + return 0; > + } > + > + /* PCIe RC work mode */ > + regval = histb_pcie_readl(hipcie, PCIE_SYS_CTRL0); > + regval &= ~PCIE_DEVICE_TYPE_MASK; > + regval |= PCIE_WM_RC; > + histb_pcie_writel(hipcie, PCIE_SYS_CTRL0, regval); > + > + /* setup root complex */ > + dw_pcie_setup_rc(pp); > + > + /* assert LTSSM enable */ > + regval = histb_pcie_readl(hipcie, PCIE_SYS_CTRL7); > + regval |= PCIE_APP_LTSSM_ENABLE; > + histb_pcie_writel(hipcie, PCIE_SYS_CTRL7, regval); > + > + return dw_pcie_wait_for_link(pci); > +} > + > +static int histb_pcie_host_init(struct pcie_port *pp) > +{ > + histb_pcie_establish_link(pp); > + > + if (IS_ENABLED(CONFIG_PCI_MSI)) > + dw_pcie_msi_init(pp); > + > + return 0; > +} > + > +static struct dw_pcie_host_ops histb_pcie_host_ops = { > + .rd_own_conf = histb_pcie_rd_own_conf, > + .wr_own_conf = histb_pcie_wr_own_conf, > + .host_init = histb_pcie_host_init, > +}; > + > +static irqreturn_t histb_pcie_msi_irq_handler(int irq, void *arg) > +{ > + struct pcie_port *pp = arg; > + > + return dw_handle_msi_irq(pp); > +} > + > +static void histb_pcie_host_disable(struct histb_pcie *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->reset_gpio)) > + gpio_set_value_cansleep(hipcie->reset_gpio, 0); > +} > + > +static int histb_pcie_host_enable(struct pcie_port *pp) > +{ > + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); > + struct histb_pcie *hipcie = to_histb_pcie(pci); > + struct device *dev = pci->dev; > + int ret; > + > + /* power on PCIe device if have */ > + if (gpio_is_valid(hipcie->reset_gpio)) > + gpio_set_value_cansleep(hipcie->reset_gpio, 1); > + > + 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 const struct dw_pcie_ops dw_pcie_ops = { > + .read_dbi = histb_pcie_read_dbi, > + .write_dbi = histb_pcie_write_dbi, > + .link_up = histb_pcie_link_up, > +}; > + > +static int histb_pcie_probe(struct platform_device *pdev) > +{ > + struct histb_pcie *hipcie; > + struct dw_pcie *pci; > + struct pcie_port *pp; > + struct resource *res; > + struct device_node *np = pdev->dev.of_node; > + struct device *dev = &pdev->dev; > + enum of_gpio_flags of_flags; > + unsigned long flag = GPIOF_DIR_OUT; > + int ret; > + > + hipcie = devm_kzalloc(dev, sizeof(*hipcie), GFP_KERNEL); > + if (!hipcie) > + return -ENOMEM; > + > + pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL); > + if (!pci) > + return -ENOMEM; > + > + hipcie->pci = pci; > + pp = &pci->pp; > + pci->dev = dev; > + pci->ops = &dw_pcie_ops; > + > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "control"); > + hipcie->ctrl = devm_ioremap_resource(dev, res); > + if (IS_ERR(hipcie->ctrl)) { > + dev_err(dev, "cannot get control reg base\n"); > + return PTR_ERR(hipcie->ctrl); > + } > + > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rc-dbi"); > + pci->dbi_base = devm_ioremap_resource(dev, res); > + if (IS_ERR(pci->dbi_base)) { > + dev_err(dev, "cannot get rc-dbi base\n"); > + return PTR_ERR(pci->dbi_base); > + } > + > + hipcie->reset_gpio = of_get_named_gpio_flags(np, > + "reset-gpios", 0, &of_flags); > + if (of_flags & OF_GPIO_ACTIVE_LOW) > + flag |= GPIOF_ACTIVE_LOW; > + if (gpio_is_valid(hipcie->reset_gpio)) { > + ret = devm_gpio_request_one(dev, hipcie->reset_gpio, > + flag, "PCIe device power control"); > + if (ret) { > + dev_err(dev, "unable to request gpio\n"); > + return ret; > + } > + } > + > + hipcie->aux_clk = devm_clk_get(dev, "aux"); > + if (IS_ERR(hipcie->aux_clk)) { > + dev_err(dev, "Failed to get PCIe aux clk\n"); > + return PTR_ERR(hipcie->aux_clk); > + } > + > + hipcie->pipe_clk = devm_clk_get(dev, "pipe"); > + if (IS_ERR(hipcie->pipe_clk)) { > + dev_err(dev, "Failed to get PCIe pipe clk\n"); > + return PTR_ERR(hipcie->pipe_clk); > + } > + > + hipcie->sys_clk = devm_clk_get(dev, "sys"); > + if (IS_ERR(hipcie->sys_clk)) { > + dev_err(dev, "Failed to get PCIEe sys clk\n"); > + return PTR_ERR(hipcie->sys_clk); > + } > + > + hipcie->bus_clk = devm_clk_get(dev, "bus"); > + if (IS_ERR(hipcie->bus_clk)) { > + dev_err(dev, "Failed to get PCIe bus clk\n"); > + return PTR_ERR(hipcie->bus_clk); > + } > + > + hipcie->soft_reset = devm_reset_control_get(dev, "soft"); > + 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"); > + 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"); > + 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; > + } > + } > + > + hipcie->phy = devm_phy_get(dev, "phy"); > + if (IS_ERR(hipcie->phy)) { > + dev_info(dev, "no pcie-phy found\n"); > + hipcie->phy = NULL; > + /* fall through here! > + * if no pcie-phy found, phy init > + * should be done under boot! > + */ > + } else { > + phy_init(hipcie->phy); > + } > + > + pp->root_bus_nr = -1; > + pp->ops = &histb_pcie_host_ops; > + > + platform_set_drvdata(pdev, hipcie); > + > + 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; > + } > + > + return 0; > +} > + > +static int histb_pcie_remove(struct platform_device *pdev) > +{ > + struct histb_pcie *hipcie = platform_get_drvdata(pdev); > + > + histb_pcie_host_disable(hipcie); > + > + if (hipcie->phy) > + phy_exit(hipcie->phy); > + > + return 0; > +} > + > +static const struct of_device_id histb_pcie_of_match[] = { > + { .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 = histb_pcie_of_match, > + }, > +}; > +module_platform_driver(histb_pcie_platform_driver); > + > +MODULE_DESCRIPTION("HiSilicon STB PCIe host controller driver"); > +MODULE_LICENSE("GPL v2"); > -- > 1.9.1 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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 000000000000..e4d79d03214b --- /dev/null +++ b/Documentation/devicetree/bindings/pci/hisilicon-histb-pcie.txt @@ -0,0 +1,68 @@ +HiSilicon STB PCIe host bridge DT description + +HiSilicon STB PCIe host controller is based on DesignWare PCIe core. +It shares common functions with PCIe DesignWare core driver and inherits +common properties defined in +Documentation/devicetree/bindings/pci/designware-pcie.txt. + +Additional properties are described here: + +Required properties +- compatible: Should be one of the following strings: + "hisilicon,hi3798cv200-pcie" +- reg: Should contain sysctl, rc_dbi, config registers location and length. +- reg-names: Must include the following entries: + "control": control registers of PCIe controller; + "rc-dbi": configuration space of PCIe controller; + "config": configuration transaction space of PCIe controller. +- bus-range: PCI bus numbers covered. +- 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": auxiliary gate clock; + "pipe": pipe gate clock; + "sys": sys gate clock; + "bus": 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": soft reset; + "sys": sys reset; + "bus": bus reset. + +Optional properties: +- reset-gpios: The gpio to generate PCIe PERST# assert and deassert signal. +- phys: List of phandle and phy mode specifier, should be 0. +- phy-names: Must be "phy". + +Example: + pcie@f9860000 { + compatible = "hisilicon,hi3798cv200-pcie"; + reg = <0xf9860000 0x1000>, + <0xf0000000 0x2000>, + <0xf2000000 0x01000000>; + reg-names = "control", "rc-dbi", "config"; + #address-cells = <3>; + #size-cells = <2>; + device_type = "pci"; + bus-range = <0 15>; + 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 0>; + interrupt-map = <0 0 0 0 &gic GIC_SPI 131 IRQ_TYPE_LEVEL_HIGH>; + clocks = <&crg PCIE_AUX_CLK>, + <&crg PCIE_PIPE_CLK>, + <&crg PCIE_SYS_CLK>, + <&crg PCIE_BUS_CLK>; + clock-names = "aux", "pipe", "sys", "bus"; + resets = <&crg 0x18c 6>, <&crg 0x18c 5>, <&crg 0x18c 4>; + reset-names = "soft", "sys", "bus"; + phys = <&combphy1 PHY_TYPE_PCIE>; + phy-names = "phy"; + }; diff --git a/MAINTAINERS b/MAINTAINERS index a74227ad082e..2520bf02bc12 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -10487,6 +10487,14 @@ S: Maintained F: Documentation/devicetree/bindings/pci/pcie-kirin.txt F: drivers/pci/dwc/pcie-kirin.c +PCIE DRIVER FOR HISILICON STB +M: Jianguo Sun <sunjianguo1@huawei.com> +M: Shawn Guo <shawn.guo@linaro.org> +L: linux-pci@vger.kernel.org +S: Maintained +F: Documentation/devicetree/bindings/pci/hisilicon-histb-pcie.txt +F: drivers/pci/dwc/pcie-histb.c + PCIE DRIVER FOR MEDIATEK M: Ryder Lee <ryder.lee@mediatek.com> L: linux-pci@vger.kernel.org diff --git a/drivers/pci/dwc/Kconfig b/drivers/pci/dwc/Kconfig index 22ec82fcdea2..113e09440f85 100644 --- a/drivers/pci/dwc/Kconfig +++ b/drivers/pci/dwc/Kconfig @@ -169,4 +169,14 @@ config PCIE_KIRIN Say Y here if you want PCIe controller support on HiSilicon Kirin series SoCs. +config PCIE_HISI_STB + bool "HiSilicon STB SoCs PCIe controllers" + depends on ARCH_HISI + depends on PCI + depends on PCI_MSI_IRQ_DOMAIN + select PCIEPORTBUS + select PCIE_DW_HOST + help + Say Y here if you want PCIe controller support on HiSilicon STB SoCs + endmenu diff --git a/drivers/pci/dwc/Makefile b/drivers/pci/dwc/Makefile index c61be9738cce..54f56f6e9236 100644 --- a/drivers/pci/dwc/Makefile +++ b/drivers/pci/dwc/Makefile @@ -14,6 +14,7 @@ obj-$(CONFIG_PCIE_QCOM) += pcie-qcom.o obj-$(CONFIG_PCIE_ARMADA_8K) += pcie-armada8k.o obj-$(CONFIG_PCIE_ARTPEC6) += pcie-artpec6.o obj-$(CONFIG_PCIE_KIRIN) += pcie-kirin.o +obj-$(CONFIG_PCIE_HISI_STB) += pcie-histb.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/dwc/pcie-histb.c b/drivers/pci/dwc/pcie-histb.c new file mode 100644 index 000000000000..d41ed01e3415 --- /dev/null +++ b/drivers/pci/dwc/pcie-histb.c @@ -0,0 +1,469 @@ +/* + * PCIe host controller driver for HiSilicon STB SoCs + * + * Copyright (C) 2016-2017 HiSilicon Co., Ltd. http://www.hisilicon.com + * + * Authors: Ruqiang Ju <juruqiang@hisilicon.com> + * Jianguo Sun <sunjianguo1@huawei.com> + * + * 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/phy/phy.h> +#include <linux/platform_device.h> +#include <linux/resource.h> +#include <linux/reset.h> + +#include "pcie-designware.h" + +#define to_histb_pcie(x) dev_get_drvdata((x)->dev) + +#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 { + struct dw_pcie *pci; + struct clk *aux_clk; + struct clk *pipe_clk; + struct clk *sys_clk; + struct clk *bus_clk; + struct phy *phy; + struct reset_control *soft_reset; + struct reset_control *sys_reset; + struct reset_control *bus_reset; + void __iomem *ctrl; + int reset_gpio; +}; + +static u32 histb_pcie_readl(struct histb_pcie *histb_pcie, u32 reg) +{ + return readl(histb_pcie->ctrl + reg); +} + +static void histb_pcie_writel(struct histb_pcie *histb_pcie, u32 reg, u32 val) +{ + writel(val, histb_pcie->ctrl + reg); +} + +static void histb_pcie_dbi_w_mode(struct pcie_port *pp, bool enable) +{ + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); + struct histb_pcie *hipcie = to_histb_pcie(pci); + u32 val; + + val = histb_pcie_readl(hipcie, PCIE_SYS_CTRL0); + if (enable) + val |= PCIE_ELBI_SLV_DBI_ENABLE; + else + val &= ~PCIE_ELBI_SLV_DBI_ENABLE; + histb_pcie_writel(hipcie, PCIE_SYS_CTRL0, val); +} + +static void histb_pcie_dbi_r_mode(struct pcie_port *pp, bool enable) +{ + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); + struct histb_pcie *hipcie = to_histb_pcie(pci); + u32 val; + + val = histb_pcie_readl(hipcie, PCIE_SYS_CTRL1); + if (enable) + val |= PCIE_ELBI_SLV_DBI_ENABLE; + else + val &= ~PCIE_ELBI_SLV_DBI_ENABLE; + histb_pcie_writel(hipcie, PCIE_SYS_CTRL1, val); +} + +static u32 histb_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base, + u32 reg, size_t size) +{ + u32 val; + + histb_pcie_dbi_r_mode(&pci->pp, true); + dw_pcie_read(base + reg, size, &val); + histb_pcie_dbi_r_mode(&pci->pp, false); + + return val; +} + +static void histb_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base, + u32 reg, size_t size, u32 val) +{ + histb_pcie_dbi_w_mode(&pci->pp, true); + dw_pcie_write(base + reg, size, val); + histb_pcie_dbi_w_mode(&pci->pp, false); +} + +static int histb_pcie_rd_own_conf(struct pcie_port *pp, int where, + int size, u32 *val) +{ + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); + int ret; + + histb_pcie_dbi_r_mode(pp, true); + ret = dw_pcie_read(pci->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) +{ + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); + int ret; + + histb_pcie_dbi_w_mode(pp, true); + ret = dw_pcie_write(pci->dbi_base + where, size, val); + histb_pcie_dbi_w_mode(pp, false); + + return ret; +} + +static int histb_pcie_link_up(struct dw_pcie *pci) +{ + struct histb_pcie *hipcie = to_histb_pcie(pci); + u32 regval; + u32 status; + + regval = histb_pcie_readl(hipcie, PCIE_SYS_STAT0); + status = histb_pcie_readl(hipcie, 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 dw_pcie *pci = to_dw_pcie_from_pp(pp); + struct histb_pcie *hipcie = to_histb_pcie(pci); + u32 regval; + + if (dw_pcie_link_up(pci)) { + dev_info(pci->dev, "Link already up\n"); + return 0; + } + + /* PCIe RC work mode */ + regval = histb_pcie_readl(hipcie, PCIE_SYS_CTRL0); + regval &= ~PCIE_DEVICE_TYPE_MASK; + regval |= PCIE_WM_RC; + histb_pcie_writel(hipcie, PCIE_SYS_CTRL0, regval); + + /* setup root complex */ + dw_pcie_setup_rc(pp); + + /* assert LTSSM enable */ + regval = histb_pcie_readl(hipcie, PCIE_SYS_CTRL7); + regval |= PCIE_APP_LTSSM_ENABLE; + histb_pcie_writel(hipcie, PCIE_SYS_CTRL7, regval); + + return dw_pcie_wait_for_link(pci); +} + +static int histb_pcie_host_init(struct pcie_port *pp) +{ + histb_pcie_establish_link(pp); + + if (IS_ENABLED(CONFIG_PCI_MSI)) + dw_pcie_msi_init(pp); + + return 0; +} + +static struct dw_pcie_host_ops histb_pcie_host_ops = { + .rd_own_conf = histb_pcie_rd_own_conf, + .wr_own_conf = histb_pcie_wr_own_conf, + .host_init = histb_pcie_host_init, +}; + +static irqreturn_t histb_pcie_msi_irq_handler(int irq, void *arg) +{ + struct pcie_port *pp = arg; + + return dw_handle_msi_irq(pp); +} + +static void histb_pcie_host_disable(struct histb_pcie *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->reset_gpio)) + gpio_set_value_cansleep(hipcie->reset_gpio, 0); +} + +static int histb_pcie_host_enable(struct pcie_port *pp) +{ + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); + struct histb_pcie *hipcie = to_histb_pcie(pci); + struct device *dev = pci->dev; + int ret; + + /* power on PCIe device if have */ + if (gpio_is_valid(hipcie->reset_gpio)) + gpio_set_value_cansleep(hipcie->reset_gpio, 1); + + 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 const struct dw_pcie_ops dw_pcie_ops = { + .read_dbi = histb_pcie_read_dbi, + .write_dbi = histb_pcie_write_dbi, + .link_up = histb_pcie_link_up, +}; + +static int histb_pcie_probe(struct platform_device *pdev) +{ + struct histb_pcie *hipcie; + struct dw_pcie *pci; + struct pcie_port *pp; + struct resource *res; + struct device_node *np = pdev->dev.of_node; + struct device *dev = &pdev->dev; + enum of_gpio_flags of_flags; + unsigned long flag = GPIOF_DIR_OUT; + int ret; + + hipcie = devm_kzalloc(dev, sizeof(*hipcie), GFP_KERNEL); + if (!hipcie) + return -ENOMEM; + + pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL); + if (!pci) + return -ENOMEM; + + hipcie->pci = pci; + pp = &pci->pp; + pci->dev = dev; + pci->ops = &dw_pcie_ops; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "control"); + hipcie->ctrl = devm_ioremap_resource(dev, res); + if (IS_ERR(hipcie->ctrl)) { + dev_err(dev, "cannot get control reg base\n"); + return PTR_ERR(hipcie->ctrl); + } + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rc-dbi"); + pci->dbi_base = devm_ioremap_resource(dev, res); + if (IS_ERR(pci->dbi_base)) { + dev_err(dev, "cannot get rc-dbi base\n"); + return PTR_ERR(pci->dbi_base); + } + + hipcie->reset_gpio = of_get_named_gpio_flags(np, + "reset-gpios", 0, &of_flags); + if (of_flags & OF_GPIO_ACTIVE_LOW) + flag |= GPIOF_ACTIVE_LOW; + if (gpio_is_valid(hipcie->reset_gpio)) { + ret = devm_gpio_request_one(dev, hipcie->reset_gpio, + flag, "PCIe device power control"); + if (ret) { + dev_err(dev, "unable to request gpio\n"); + return ret; + } + } + + hipcie->aux_clk = devm_clk_get(dev, "aux"); + if (IS_ERR(hipcie->aux_clk)) { + dev_err(dev, "Failed to get PCIe aux clk\n"); + return PTR_ERR(hipcie->aux_clk); + } + + hipcie->pipe_clk = devm_clk_get(dev, "pipe"); + if (IS_ERR(hipcie->pipe_clk)) { + dev_err(dev, "Failed to get PCIe pipe clk\n"); + return PTR_ERR(hipcie->pipe_clk); + } + + hipcie->sys_clk = devm_clk_get(dev, "sys"); + if (IS_ERR(hipcie->sys_clk)) { + dev_err(dev, "Failed to get PCIEe sys clk\n"); + return PTR_ERR(hipcie->sys_clk); + } + + hipcie->bus_clk = devm_clk_get(dev, "bus"); + if (IS_ERR(hipcie->bus_clk)) { + dev_err(dev, "Failed to get PCIe bus clk\n"); + return PTR_ERR(hipcie->bus_clk); + } + + hipcie->soft_reset = devm_reset_control_get(dev, "soft"); + 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"); + 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"); + 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; + } + } + + hipcie->phy = devm_phy_get(dev, "phy"); + if (IS_ERR(hipcie->phy)) { + dev_info(dev, "no pcie-phy found\n"); + hipcie->phy = NULL; + /* fall through here! + * if no pcie-phy found, phy init + * should be done under boot! + */ + } else { + phy_init(hipcie->phy); + } + + pp->root_bus_nr = -1; + pp->ops = &histb_pcie_host_ops; + + platform_set_drvdata(pdev, hipcie); + + 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; + } + + return 0; +} + +static int histb_pcie_remove(struct platform_device *pdev) +{ + struct histb_pcie *hipcie = platform_get_drvdata(pdev); + + histb_pcie_host_disable(hipcie); + + if (hipcie->phy) + phy_exit(hipcie->phy); + + return 0; +} + +static const struct of_device_id histb_pcie_of_match[] = { + { .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 = histb_pcie_of_match, + }, +}; +module_platform_driver(histb_pcie_platform_driver); + +MODULE_DESCRIPTION("HiSilicon STB PCIe host controller driver"); +MODULE_LICENSE("GPL v2");