[PATCH 05/17] pci: host: pcie-dra7xx: add support for pcie-dra7xx controller

Kishon Vijay Abraham I
2014-05-06T13:33:51Z

Added support for pcie controller in dra7xx. This driver re-uses
the designware core code that is already present in kernel.

Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Mohit Kumar <mohit.kumar@st.com>
Cc: Jingoo Han <jg1.han@samsung.com>
Cc: Marek Vasut <marex@denx.de>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
Documentation/devicetree/bindings/pci/ti-pci.txt | 33 ++
drivers/pci/host/Kconfig | 10 +
drivers/pci/host/Makefile | 1 +
drivers/pci/host/pci-dra7xx.c | 385 ++++++++++++++++++++++
4 files changed, 429 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pci/ti-pci.txt
create mode 100644 drivers/pci/host/pci-dra7xx.c

diff --git a/Documentation/devicetree/bindings/pci/ti-pci.txt b/Documentation/devicetree/bindings/pci/ti-pci.txt
new file mode 100644
index 0000000..6cb6f09
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/ti-pci.txt
@@ -0,0 +1,33 @@
+TI PCI Controllers
+
+PCIe Designware Controller
+This node should have the properties described in "designware-pcie.txt".
+ - compatible: Should be "ti,dra7xx-pcie""
+ - reg : Address and length of the register set for the device.
+ - reg-names : "ti_conf" for the TI specific registers and rc_dbics for the
+ "designware" registers.
+ - phys : the phandle for the PHY device (used by generic PHY framework)
+ - phy-names : the names of the PHY corresponding to the PHYs present in the
+ *phy* phandle.
+
+Example:
+pcie at 51000000 {
+ compatible = "ti,dra7xx-pcie";
+ reg = <0x51002000 0x14c>, <0x51000000 0x2000>;
+ reg-names = "ti_conf", "rc_dbics";
+ interrupts = <0 232 0x4>, <0 233 0x4>;
+ #address-cells = <3>;
+ #size-cells = <2>;
+ device_type = "pci";
+ ti,device_type = <3>;
+ ranges = <0x00000800 0 0x20001000 0x20001000 0 0x00002000 /* Configuration Space */
+ 0x81000000 0 0 0x20003000 0 0x00010000 /* IO Space */
+ 0x82000000 0 0x20013000 0x20013000 0 0xffed000>; /* MEM Space */
+ #interrupt-cells = <1>;
+ num-lanes = <1>;
+ interrupt-map-mask = <0 0 0 0>;
+ interrupt-map = <0x0 0 &gic 134>;
+ ti,hwmods = "pcie1";
+ phys = <&pcie1_phy>;
+ phy-names = "pcie-phy";
+};
diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index a6f67ec..7be6393 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -1,6 +1,16 @@
menu "PCI host controller drivers"
depends on PCI

+config PCI_DRA7XX
+ bool "TI DRA7xx PCIe controller"
+ select PCIE_DW
+ depends on OF || HAS_IOMEM || TI_PIPE3
+ help
+ Enables support for the PCIE controller present in DRA7xx SoC. There
+ are two instances of PCIE controller in DRA7xx. This controller can
+ act both as EP and RC. This reuses the same Designware core as used
+ by other SoCs.
+
config PCI_MVEBU
bool "Marvell EBU PCIe controller"
depends on ARCH_MVEBU || ARCH_DOVE || ARCH_KIRKWOOD
diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
index 13fb333..5216f55 100644
--- a/drivers/pci/host/Makefile
+++ b/drivers/pci/host/Makefile
@@ -1,4 +1,5 @@
obj-$(CONFIG_PCIE_DW) += pcie-designware.o
+obj-$(CONFIG_PCI_DRA7XX) += pci-dra7xx.o
obj-$(CONFIG_PCI_EXYNOS) += pci-exynos.o
obj-$(CONFIG_PCI_IMX6) += pci-imx6.o
obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
diff --git a/drivers/pci/host/pci-dra7xx.c b/drivers/pci/host/pci-dra7xx.c
new file mode 100644
index 0000000..a37c25c
--- /dev/null
+++ b/drivers/pci/host/pci-dra7xx.c
@@ -0,0 +1,385 @@
+/*
+ * pcie-dra7xx - PCIe controller driver for TI DRA7xx SoCs
+ *
+ * Copyright (C) 2013-2014 Texas Instruments Incorporated - http://www.ti.com
+ *
+ * Authors: Kishon Vijay Abraham I <kishon@ti.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/delay.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/resource.h>
+#include <linux/types.h>
+
+#include "pcie-designware.h"
+
+/* PCIe controller wrapper DRA7XX configuration registers */
+
+#define PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN 0x0024
+#define PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MAIN 0x0028
+#define ERR_SYS BIT(0)
+#define ERR_FATAL BIT(1)
+#define ERR_NONFATAL BIT(2)
+#define ERR_COR BIT(3)
+#define ERR_AXI BIT(4)
+#define ERR_ECRC BIT(5)
+#define PME_TURN_OFF BIT(8)
+#define PME_TO_ACK BIT(9)
+#define PM_PME BIT(10)
+#define LINK_REQ_RST BIT(11)
+#define LINK_UP_EVT BIT(12)
+#define CFG_BME_EVT BIT(13)
+#define CFG_MSE_EVT BIT(14)
+#define INTERRUPTS (ERR_SYS | ERR_FATAL | ERR_NONFATAL | ERR_COR | ERR_AXI | \
+ ERR_ECRC | PME_TURN_OFF | PME_TO_ACK | PM_PME | \
+ LINK_REQ_RST | LINK_UP_EVT | CFG_BME_EVT | CFG_MSE_EVT)
+
+#define PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI 0x0034
+#define PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MSI 0x0038
+#define INTA BIT(0)
+#define INTB BIT(1)
+#define INTC BIT(2)
+#define INTD BIT(3)
+#define MSI BIT(4)
+#define LEG_EP_INTERRUPTS (INTA | INTB | INTC | INTD)
+
+#define PCIECTRL_DRA7XX_CONF_DEVICE_CMD 0x0104
+#define LTSSM_EN 0x1
+
+#define PCIECTRL_DRA7XX_CONF_PHY_CS 0x010C
+#define LINK_UP BIT(16)
+
+struct dra7xx_pcie {
+ void __iomem *base;
+ struct phy *phy;
+ struct device *dev;
+ struct pcie_port pp;
+};
+
+#define to_dra7xx_pcie(x) container_of((x), struct dra7xx_pcie, pp)
+
+static inline u32 dra7xx_pcie_readl(void __iomem *base, u32 offset)
+{
+ return readl(base + offset);
+}
+
+static inline void dra7xx_pcie_writel(void __iomem *base, u32 offset, u32 value)
+{
+ writel(value, base + offset);
+}
+
+static int dra7xx_pcie_link_up(struct pcie_port *pp)
+{
+ struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pp);
+ u32 reg = dra7xx_pcie_readl(dra7xx->base, PCIECTRL_DRA7XX_CONF_PHY_CS);
+
+ if (reg & LINK_UP)
+ return true;
+ return false;
+}
+
+static int dra7xx_pcie_establish_link(struct pcie_port *pp)
+{
+ u32 reg;
+ int retries = 1000;
+ struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pp);
+
+ if (dw_pcie_link_up(pp)) {
+ dev_err(pp->dev, "link is already up\n");
+ return 0;
+ }
+
+ reg = dra7xx_pcie_readl(dra7xx->base, PCIECTRL_DRA7XX_CONF_DEVICE_CMD);
+ reg |= LTSSM_EN;
+ dra7xx_pcie_writel(dra7xx->base, PCIECTRL_DRA7XX_CONF_DEVICE_CMD, reg);
+
+ while (--retries) {
+ reg = dra7xx_pcie_readl(dra7xx->base,
+ PCIECTRL_DRA7XX_CONF_PHY_CS);
+ if (reg & LINK_UP)
+ break;
+ usleep_range(10, 20);
+ }
+
+ if (retries <= 0) {
+ dev_err(pp->dev, "link is not up\n");
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
+static void dra7xx_pcie_enable_interrupts(struct pcie_port *pp)
+{
+ struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pp);
+
+ dra7xx_pcie_writel(dra7xx->base, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN,
+ ~INTERRUPTS);
+ dra7xx_pcie_writel(dra7xx->base,
+ PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MAIN, INTERRUPTS);
+ dra7xx_pcie_writel(dra7xx->base, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI,
+ ~LEG_EP_INTERRUPTS & ~MSI);
+
+ if (IS_ENABLED(CONFIG_PCI_MSI))
+ dra7xx_pcie_writel(dra7xx->base,
+ PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MSI, MSI);
+ else
+ dra7xx_pcie_writel(dra7xx->base,
+ PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MSI,
+ LEG_EP_INTERRUPTS);
+}
+
+static void dra7xx_pcie_host_init(struct pcie_port *pp)
+{
+ dw_pcie_setup_rc(pp);
+ dra7xx_pcie_establish_link(pp);
+ if (IS_ENABLED(CONFIG_PCI_MSI))
+ dw_pcie_msi_init(pp);
+ dra7xx_pcie_enable_interrupts(pp);
+}
+
+static struct pcie_host_ops dra7xx_pcie_host_ops = {
+ .link_up = dra7xx_pcie_link_up,
+ .host_init = dra7xx_pcie_host_init,
+};
+
+static irqreturn_t dra7xx_pcie_msi_irq_handler(int irq, void *arg)
+{
+ struct pcie_port *pp = arg;
+ struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pp);
+ u32 reg;
+
+ reg = dra7xx_pcie_readl(dra7xx->base,
+ PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI);
+ dw_handle_msi_irq(pp);
+ dra7xx_pcie_writel(dra7xx->base, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI,
+ reg);
+
+ return IRQ_HANDLED;
+}
+
+
+static irqreturn_t dra7xx_pcie_irq_handler(int irq, void *arg)
+{
+ struct dra7xx_pcie *dra7xx = arg;
+ u32 reg;
+
+ reg = dra7xx_pcie_readl(dra7xx->base,
+ PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN);
+
+ if (reg & ERR_SYS)
+ dev_dbg(dra7xx->dev, "System Error\n");
+
+ if (reg & ERR_FATAL)
+ dev_dbg(dra7xx->dev, "Fatal Error\n");
+
+ if (reg & ERR_NONFATAL)
+ dev_dbg(dra7xx->dev, "Non Fatal Error\n");
+
+ if (reg & ERR_COR)
+ dev_dbg(dra7xx->dev, "Correctable Error\n");
+
+ if (reg & ERR_AXI)
+ dev_dbg(dra7xx->dev, "AXI tag lookup fatal Error\n");
+
+ if (reg & ERR_ECRC)
+ dev_dbg(dra7xx->dev, "ECRC Error\n");
+
+ if (reg & PME_TURN_OFF)
+ dev_dbg(dra7xx->dev,
+ "Power Management Event Turn-Off message received\n");
+
+ if (reg & PME_TO_ACK)
+ dev_dbg(dra7xx->dev,
+ "Power Management Turn-Off Ack message received\n");
+
+ if (reg & PM_PME)
+ dev_dbg(dra7xx->dev,
+ "PM Power Management Event message received\n");
+
+ if (reg & LINK_REQ_RST)
+ dev_dbg(dra7xx->dev, "Link Request Reset\n");
+
+ if (reg & LINK_UP_EVT)
+ dev_dbg(dra7xx->dev, "Link-up state change\n");
+
+ if (reg & CFG_BME_EVT)
+ dev_dbg(dra7xx->dev, "CFG 'Bus Master Enable' change\n");
+
+ if (reg & CFG_MSE_EVT)
+ dev_dbg(dra7xx->dev, "CFG 'Memory Space Enable' change\n");
+
+ dra7xx_pcie_writel(dra7xx->base, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN,
+ reg);
+
+ return IRQ_HANDLED;
+}
+
+static int add_pcie_port(struct dra7xx_pcie *dra7xx,
+ struct platform_device *pdev)
+{
+ int ret;
+ struct pcie_port *pp;
+ struct resource *res;
+ struct device *dev = &pdev->dev;
+
+ pp = &dra7xx->pp;
+ pp->dev = dev;
+ pp->ops = &dra7xx_pcie_host_ops;
+
+ spin_lock_init(&pp->conf_lock);
+
+ pp->irq = platform_get_irq(pdev, 1);
+ if (pp->irq < 0) {
+ dev_err(dev, "missing IRQ resource\n");
+ return -EINVAL;
+ }
+
+ if (IS_ENABLED(CONFIG_PCI_MSI)) {
+ ret = devm_request_irq(&pdev->dev, pp->irq,
+ dra7xx_pcie_msi_irq_handler, IRQF_SHARED,
+ "dra7-pcie-msi", pp);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to request irq\n");
+ return ret;
+ }
+ }
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rc_dbics");
+ pp->dbi_base = devm_ioremap_nocache(dev, res->start,
+ resource_size(res));
+ if (!pp->dbi_base)
+ return -ENOMEM;
+
+ ret = dw_pcie_host_init(pp);
+ if (ret) {
+ dev_err(dra7xx->dev, "failed to initialize host\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int __init dra7xx_pcie_probe(struct platform_device *pdev)
+{
+ u32 reg;
+ int ret;
+ int irq;
+ struct phy *phy;
+ void __iomem *base;
+ struct resource *res;
+ struct dra7xx_pcie *dra7xx;
+ struct device *dev = &pdev->dev;
+
+ dra7xx = devm_kzalloc(&pdev->dev, sizeof(*dra7xx), GFP_KERNEL);
+ if (!dra7xx)
+ return -ENOMEM;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(dev, "missing IRQ resource\n");
+ return -EINVAL;
+ }
+
+ ret = devm_request_irq(&pdev->dev, irq, dra7xx_pcie_irq_handler,
+ IRQF_SHARED, "dra7xx-pcie-main", dra7xx);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to request irq\n");
+ return ret;
+ }
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ti_conf");
+ base = devm_ioremap_nocache(dev, res->start, resource_size(res));
+ if (!base)
+ return -ENOMEM;
+
+ phy = devm_phy_get(dev, "pcie-phy");
+ if (IS_ERR(phy))
+ return PTR_ERR(phy);
+
+ ret = phy_init(phy);
+ if (ret < 0)
+ return ret;
+
+ ret = phy_power_on(phy);
+ if (ret < 0)
+ goto err_power_on;
+
+ dra7xx->base = base;
+ dra7xx->phy = phy;
+ dra7xx->dev = dev;
+
+ pm_runtime_enable(&pdev->dev);
+ ret = pm_runtime_get_sync(&pdev->dev);
+ if (IS_ERR_VALUE(ret)) {
+ dev_err(dev, "pm_runtime_get_sync failed\n");
+ goto err_runtime_get;
+ }
+
+ reg = dra7xx_pcie_readl(dra7xx->base, PCIECTRL_DRA7XX_CONF_DEVICE_CMD);
+ reg &= ~LTSSM_EN;
+ dra7xx_pcie_writel(dra7xx->base, PCIECTRL_DRA7XX_CONF_DEVICE_CMD, reg);
+
+ ret = add_pcie_port(dra7xx, pdev);
+ if (ret < 0)
+ goto err_add_port;
+
+ platform_set_drvdata(pdev, dra7xx);
+ return 0;
+
+err_power_on:
+ phy_exit(phy);
+
+err_runtime_get:
+ phy_power_off(phy);
+
+err_add_port:
+ pm_runtime_put(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+
+ return ret;
+}
+
+static int __exit dra7xx_pcie_remove(struct platform_device *pdev)
+{
+ struct dra7xx_pcie *dra7xx = platform_get_drvdata(pdev);
+
+ pm_runtime_put(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+ phy_power_off(dra7xx->phy);
+ phy_exit(dra7xx->phy);
+
+ return 0;
+}
+
+static const struct of_device_id of_dra7xx_pcie_match[] = {
+ { .compatible = "ti,dra7xx-pcie", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, of_dra7xx_pcie_match);
+
+static struct platform_driver dra7xx_pcie_driver = {
+ .remove = __exit_p(dra7xx_pcie_remove),
+ .driver = {
+ .name = "dra7xx-pcie",
+ .owner = THIS_MODULE,
+ .of_match_table = of_dra7xx_pcie_match,
+ },
+};
+
+module_platform_driver_probe(dra7xx_pcie_driver, dra7xx_pcie_probe);
+
+MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
+MODULE_DESCRIPTION("TI PCIe controller driver");
+MODULE_LICENSE("GPL v2");
--
1.7.9.5