[PATCH] PCI: hisi: add PCIe driver support for HiSilicon STB SoCs
Shawn Guo
shawnguo at kernel.org
Sat Oct 14 22:06:11 PDT 2017
From: Jianguo Sun <sunjianguo1 at huawei.com>
Add PCIe controller driver for HiSilicon STB SoCs,
the controller is based on the DesignWare's PCIe core.
Signed-off-by: Jianguo Sun <sunjianguo1 at huawei.com>
Signed-off-by: Shawn Guo <shawn.guo at linaro.org>
---
.../bindings/pci/hisilicon-histb-pcie.txt | 66 +++
drivers/pci/dwc/Kconfig | 10 +
drivers/pci/dwc/Makefile | 1 +
drivers/pci/dwc/pcie-histb.c | 469 +++++++++++++++++++++
4 files changed, 546 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..9474ad9bc36c
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/hisilicon-histb-pcie.txt
@@ -0,0 +1,66 @@
+HiSilicon STB PCIe host bridge DT description
+
+HiSilicon STB 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-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 at 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 7>;
+ interrupt-map = <0 0 0 1 &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";
+ };
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..bc0d00b2a06a
--- /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: Jianguo Sun <sunjianguo1 at 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 pcie 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
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