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SubjectRe: [PATCH v4 5/6] usb:cdns3 Add Cadence USB3 DRD Driver
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hi,
On Thu, 2019-02-14 at 19:45 +0000, Pawel Laszczak wrote:
> This patch introduce new Cadence USBSS DRD driver to linux kernel.
>
> The Cadence USBSS DRD Driver is a highly configurable IP Core whichi
> can be instantiated as Dual-Role Device (DRD), Peripheral Only and
> Host Only (XHCI)configurations.
>
> The current driver has been validated with FPGA burned. We have support
> for PCIe bus, which is used on FPGA prototyping.
>
> The host side of USBSS-DRD controller is compliance with XHCI
> specification, so it works with standard XHCI linux driver.
>
> Signed-off-by: Pawel Laszczak <pawell@cadence.com>
> ---
> drivers/usb/Kconfig | 2 +
> drivers/usb/Makefile | 2 +
> drivers/usb/cdns3/Kconfig | 44 +
> drivers/usb/cdns3/Makefile | 14 +
> drivers/usb/cdns3/cdns3-pci-wrap.c | 155 +++
> drivers/usb/cdns3/core.c | 403 ++++++
> drivers/usb/cdns3/core.h | 116 ++
> drivers/usb/cdns3/debug.h | 168 +++
> drivers/usb/cdns3/debugfs.c | 164 +++
> drivers/usb/cdns3/drd.c | 365 +++++
> drivers/usb/cdns3/drd.h | 162 +++
> drivers/usb/cdns3/ep0.c | 907 +++++++++++++
> drivers/usb/cdns3/gadget-export.h | 28 +
> drivers/usb/cdns3/gadget.c | 2003 ++++++++++++++++++++++++++++
> drivers/usb/cdns3/gadget.h | 1207 +++++++++++++++++
> drivers/usb/cdns3/host-export.h | 28 +
> drivers/usb/cdns3/host.c | 72 +
> drivers/usb/cdns3/trace.c | 23 +
> drivers/usb/cdns3/trace.h | 404 ++++++
> 19 files changed, 6267 insertions(+)
> create mode 100644 drivers/usb/cdns3/Kconfig
> create mode 100644 drivers/usb/cdns3/Makefile
> create mode 100644 drivers/usb/cdns3/cdns3-pci-wrap.c
> create mode 100644 drivers/usb/cdns3/core.c
> create mode 100644 drivers/usb/cdns3/core.h
> create mode 100644 drivers/usb/cdns3/debug.h
> create mode 100644 drivers/usb/cdns3/debugfs.c
> create mode 100644 drivers/usb/cdns3/drd.c
> create mode 100644 drivers/usb/cdns3/drd.h
> create mode 100644 drivers/usb/cdns3/ep0.c
> create mode 100644 drivers/usb/cdns3/gadget-export.h
> create mode 100644 drivers/usb/cdns3/gadget.c
> create mode 100644 drivers/usb/cdns3/gadget.h
> create mode 100644 drivers/usb/cdns3/host-export.h
> create mode 100644 drivers/usb/cdns3/host.c
> create mode 100644 drivers/usb/cdns3/trace.c
> create mode 100644 drivers/usb/cdns3/trace.h
>
> diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
> index 987fc5ba6321..5f9334019d04 100644
> --- a/drivers/usb/Kconfig
> +++ b/drivers/usb/Kconfig
> @@ -112,6 +112,8 @@ source "drivers/usb/usbip/Kconfig"
>
> endif
>
> +source "drivers/usb/cdns3/Kconfig"
> +
> source "drivers/usb/mtu3/Kconfig"
>
> source "drivers/usb/musb/Kconfig"
> diff --git a/drivers/usb/Makefile b/drivers/usb/Makefile
> index 7d1b8c82b208..ab125b966cac 100644
> --- a/drivers/usb/Makefile
> +++ b/drivers/usb/Makefile
> @@ -12,6 +12,8 @@ obj-$(CONFIG_USB_DWC3) += dwc3/
> obj-$(CONFIG_USB_DWC2) += dwc2/
> obj-$(CONFIG_USB_ISP1760) += isp1760/
>
> +obj-$(CONFIG_USB_CDNS3) += cdns3/
> +
> obj-$(CONFIG_USB_MON) += mon/
> obj-$(CONFIG_USB_MTU3) += mtu3/
>
> diff --git a/drivers/usb/cdns3/Kconfig b/drivers/usb/cdns3/Kconfig
> new file mode 100644
> index 000000000000..27cb3d8dbe3d
> --- /dev/null
> +++ b/drivers/usb/cdns3/Kconfig
> @@ -0,0 +1,44 @@
> +config USB_CDNS3
> + tristate "Cadence USB3 Dual-Role Controller"
> + depends on USB_SUPPORT && (USB || USB_GADGET) && HAS_DMA
> + help
> + Say Y here if your system has a cadence USB3 dual-role controller.
> + It supports: dual-role switch, Host-only, and Peripheral-only.
> +
> + If you choose to build this driver is a dynamically linked
> + as module, the module will be called cdns3.ko.
> +
> +if USB_CDNS3
> +
> +config USB_CDNS3_GADGET
> + bool "Cadence USB3 device controller"
> + depends on USB_GADGET
> + help
> + Say Y here to enable device controller functionality of the
> + cadence USBSS-DEV driver.
> +
> + This controller supports FF, HS and SS mode. It doesn't support
> + LS and SSP mode.
> +
> +config USB_CDNS3_HOST
> + bool "Cadence USB3 host controller"
> + depends on USB_XHCI_HCD
> + help
> + Say Y here to enable host controller functionality of the
> + cadence driver.
> +
> + Host controller is compliant with XHCI so it will use
> + standard XHCI driver.
> +
> +config USB_CDNS3_PCI_WRAP
> + tristate "Cadence USB3 support on PCIe-based platforms"
> + depends on USB_PCI && ACPI
> + default USB_CDNS3
> + help
> + If you're using the USBSS Core IP with a PCIe, please say
> + 'Y' or 'M' here.
> +
> + If you choose to build this driver as module it will
> + be dynamically linked and module will be called cdns3-pci.ko
> +
> +endif
> diff --git a/drivers/usb/cdns3/Makefile b/drivers/usb/cdns3/Makefile
> new file mode 100644
> index 000000000000..8f9438593375
> --- /dev/null
> +++ b/drivers/usb/cdns3/Makefile
> @@ -0,0 +1,14 @@
> +# SPDX-License-Identifier: GPL-2.0
> +# define_trace.h needs to know how to find our header
> +CFLAGS_trace.o := -I$(src)
> +
> +cdns3-y := core.o drd.o trace.o
> +
> +obj-$(CONFIG_USB_CDNS3) += cdns3.o
> +ifneq ($(CONFIG_DEBUG_FS),)
> + cdns3-y += debugfs.o
> +endif
> +
> +cdns3-$(CONFIG_USB_CDNS3_GADGET) += gadget.o ep0.o
> +cdns3-$(CONFIG_USB_CDNS3_HOST) += host.o
> +obj-$(CONFIG_USB_CDNS3_PCI_WRAP) += cdns3-pci-wrap.o
when build as module:
CONFIG_USB_CDNS3=m
CONFIG_USB_CDNS3_GADGET=m
CONFIG_USB_CDNS3_HOST=m
there is an error:
ERROR: "cdns3_handshake" [drivers/usb/cdns3/cdns3.ko] undefined!

when only set:
CONFIG_USB_CDNS3=y
also encounter errors:
drivers/usb/cdns3/drd.o: In function `cdns3_drd_switch_gadget':
/drivers/usb/cdns3/drd.c:173: undefined reference to `cdns3_handshake'
drivers/usb/cdns3/drd.o: In function `cdns3_drd_switch_host':
drivers/usb/cdns3/drd.c:139: undefined reference to `cdns3_handshake'



> diff --git a/drivers/usb/cdns3/cdns3-pci-wrap.c b/drivers/usb/cdns3/cdns3-pci-wrap.c
> new file mode 100644
> index 000000000000..d0b2d3d9b983
> --- /dev/null
> +++ b/drivers/usb/cdns3/cdns3-pci-wrap.c
> @@ -0,0 +1,155 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Cadence USBSS PCI Glue driver
> + *
> + * Copyright (C) 2018 Cadence.
> + *
> + * Author: Pawel Laszczak <pawell@cadence.com>
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/pci.h>
> +#include <linux/platform_device.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/slab.h>
> +
> +struct cdns3_wrap {
> + struct platform_device *plat_dev;
> + struct pci_dev *hg_dev;
> + struct resource dev_res[4];
> +};
> +
> +struct cdns3_wrap wrap;
not used in fact?

> +
> +#define RES_IRQ_ID 0
> +#define RES_HOST_ID 1
> +#define RES_DEV_ID 2
> +#define RES_DRD_ID 3
> +
> +#define PCI_BAR_HOST 0
> +#define PCI_BAR_DEV 2
> +#define PCI_BAR_OTG 4
> +
> +#define PCI_DEV_FN_HOST_DEVICE 0
> +#define PCI_DEV_FN_OTG 1
> +
> +#define PCI_DRIVER_NAME "cdns3-pci-usbss"
> +#define PLAT_DRIVER_NAME "cdns-usb3"
> +
> +#define CDNS_VENDOR_ID 0x17cd
> +#define CDNS_DEVICE_ID 0x0100
> +
> +/**
> + * cdns3_pci_probe - Probe function for Cadence USB wrapper driver
> + * @pdev: platform device object
> + * @id: pci device id
> + *
> + * Returns 0 on success otherwise negative errno
> + */
> +static int cdns3_pci_probe(struct pci_dev *pdev,
> + const struct pci_device_id *id)
> +{
> + struct platform_device_info plat_info;
> + struct cdns3_wrap *wrap;
> + struct resource *res;
> + int err;
> +
> + /*
> + * for GADGET/HOST PCI (devfn) function number is 0,
> + * for OTG PCI (devfn) function number is 1
> + */
> + if (!id || pdev->devfn != PCI_DEV_FN_HOST_DEVICE)
> + return -EINVAL;
> +
> + err = pcim_enable_device(pdev);
> + if (err) {
> + dev_err(&pdev->dev, "Enabling PCI device has failed %d\n", err);
> + return err;
> + }
> +
> + pci_set_master(pdev);
> + wrap = devm_kzalloc(&pdev->dev, sizeof(*wrap), GFP_KERNEL);
> + if (!wrap) {
> + dev_err(&pdev->dev, "Failed to allocate memory\n");
> + return -ENOMEM;
> + }
> +
> + /* function 0: host(BAR_0) + device(BAR_1) + otg(BAR_2)). */
> + memset(wrap->dev_res, 0x00,
> + sizeof(struct resource) * ARRAY_SIZE(wrap->dev_res));
Mabye not necessary, devm_kzalloc() already set them as 0;

> + dev_dbg(&pdev->dev, "Initialize Device resources\n");
> + res = wrap->dev_res;
> +
> + res[RES_DEV_ID].start = pci_resource_start(pdev, PCI_BAR_DEV);
> + res[RES_DEV_ID].end = pci_resource_end(pdev, PCI_BAR_DEV);
> + res[RES_DEV_ID].name = "dev";
> + res[RES_DEV_ID].flags = IORESOURCE_MEM;
> + dev_dbg(&pdev->dev, "USBSS-DEV physical base addr: %pa\n",
> + &res[RES_DEV_ID].start);
> +
> + res[RES_HOST_ID].start = pci_resource_start(pdev, PCI_BAR_HOST);
> + res[RES_HOST_ID].end = pci_resource_end(pdev, PCI_BAR_HOST);
> + res[RES_HOST_ID].name = "xhci";
> + res[RES_HOST_ID].flags = IORESOURCE_MEM;
> + dev_dbg(&pdev->dev, "USBSS-XHCI physical base addr: %pa\n",
> + &res[RES_HOST_ID].start);
> +
> + res[RES_DRD_ID].start = pci_resource_start(pdev, PCI_BAR_OTG);
> + res[RES_DRD_ID].end = pci_resource_end(pdev, PCI_BAR_OTG);
> + res[RES_DRD_ID].name = "otg";
> + res[RES_DRD_ID].flags = IORESOURCE_MEM;
> + dev_dbg(&pdev->dev, "USBSS-DRD physical base addr: %pa\n",
> + &res[RES_DRD_ID].start);
> +
> + /* Interrupt common for both device and XHCI */
> + wrap->dev_res[RES_IRQ_ID].start = pdev->irq;
> + wrap->dev_res[RES_IRQ_ID].name = "cdns3-irq";
> + wrap->dev_res[RES_IRQ_ID].flags = IORESOURCE_IRQ;
> +
> + /* set up platform device info */
> + memset(&plat_info, 0, sizeof(plat_info));
> + plat_info.parent = &pdev->dev;
> + plat_info.fwnode = pdev->dev.fwnode;
> + plat_info.name = PLAT_DRIVER_NAME;
> + plat_info.id = pdev->devfn;
> + plat_info.res = wrap->dev_res;
> + plat_info.num_res = ARRAY_SIZE(wrap->dev_res);
> + plat_info.dma_mask = pdev->dma_mask;
> +
> + /* register platform device */
> + wrap->plat_dev = platform_device_register_full(&plat_info);
> + if (IS_ERR(wrap->plat_dev))
> + return PTR_ERR(wrap->plat_dev);
> +
> + pci_set_drvdata(pdev, wrap);
> +
> + return err;
> +}
> +
> +void cdns3_pci_remove(struct pci_dev *pdev)
> +{
> + struct cdns3_wrap *wrap = (struct cdns3_wrap *)pci_get_drvdata(pdev);
> +
> + platform_device_unregister(wrap->plat_dev);
> +}
> +
> +static const struct pci_device_id cdns3_pci_ids[] = {
> + { PCI_DEVICE(CDNS_VENDOR_ID, CDNS_DEVICE_ID), },
> + { 0, }
> +};
> +
> +static struct pci_driver cdns3_pci_driver = {
> + .name = PCI_DRIVER_NAME,
> + .id_table = cdns3_pci_ids,
> + .probe = cdns3_pci_probe,
> + .remove = cdns3_pci_remove,
> +};
> +
> +module_pci_driver(cdns3_pci_driver);
> +MODULE_DEVICE_TABLE(pci, cdns3_pci_ids);
> +
> +MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>");
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("Cadence USBSS PCI wrapperr");
> +
> diff --git a/drivers/usb/cdns3/core.c b/drivers/usb/cdns3/core.c
> new file mode 100644
> index 000000000000..aa2f63241dab
> --- /dev/null
> +++ b/drivers/usb/cdns3/core.c
> @@ -0,0 +1,403 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Cadence USBSS DRD Driver.
> + *
> + * Copyright (C) 2018 Cadence.
> + * Copyright (C) 2017-2018 NXP
> + *
> + * Author: Peter Chen <peter.chen@nxp.com>
> + * Pawel Laszczak <pawell@cadence.com>
> + */
> +
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/platform_device.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/pm_runtime.h>
> +
> +#include "gadget.h"
> +#include "core.h"
> +#include "host-export.h"
> +#include "gadget-export.h"
> +#include "drd.h"
> +#include "debug.h"
> +
> +static inline
> +struct cdns3_role_driver *cdns3_get_current_role_driver(struct cdns3 *cdns)
> +{
> + WARN_ON(cdns->role >= CDNS3_ROLE_END || !cdns->roles[cdns->role]);
> + return cdns->roles[cdns->role];
> +}
> +
> +static int cdns3_role_start(struct cdns3 *cdns, enum cdns3_roles role)
> +{
> + int ret;
> +
> + if (WARN_ON(role >= CDNS3_ROLE_END))
> + return 0;
> +
> + if (!cdns->roles[role])
> + return -ENXIO;
> +
> + if (cdns->roles[role]->state == CDNS3_ROLE_STATE_ACTIVE)
> + return 0;
> +
> + mutex_lock(&cdns->mutex);
> + cdns->role = role;
> + ret = cdns->roles[role]->start(cdns);
> + if (!ret)
> + cdns->roles[role]->state = CDNS3_ROLE_STATE_ACTIVE;
> + mutex_unlock(&cdns->mutex);
> + return ret;
> +}
> +
> +void cdns3_role_stop(struct cdns3 *cdns)
> +{
> + enum cdns3_roles role = cdns->role;
> +
> + if (role >= CDNS3_ROLE_END) {
> + WARN_ON(role > CDNS3_ROLE_END);
> + return;
> + }
> +
> + if (cdns->roles[role]->state == CDNS3_ROLE_STATE_INACTIVE)
> + return;
> +
> + mutex_lock(&cdns->mutex);
> + cdns->roles[role]->stop(cdns);
> + cdns->roles[role]->state = CDNS3_ROLE_STATE_INACTIVE;
> + mutex_unlock(&cdns->mutex);
> +}
> +
> +/*
> + * cdns->role gets from cdns3_get_initial_role, and this API tells role at the
> + * runtime.
> + * If both roles are supported, the role is selected based on vbus/id.
> + * It could be read from OTG register or external connector.
> + * If only single role is supported, only one role structure
> + * is allocated, cdns->roles[CDNS3_ROLE_HOST] or cdns->roles[CDNS3_ROLE_GADGET].
> + */
> +static enum cdns3_roles cdns3_get_initial_role(struct cdns3 *cdns)
> +{
> + if (cdns->roles[CDNS3_ROLE_HOST] && cdns->roles[CDNS3_ROLE_GADGET]) {
> + if (cdns3_is_host(cdns))
> + return CDNS3_ROLE_HOST;
> + if (cdns3_is_device(cdns))
> + return CDNS3_ROLE_GADGET;
> + }
> + return cdns->roles[CDNS3_ROLE_HOST]
> + ? CDNS3_ROLE_HOST
> + : CDNS3_ROLE_GADGET;
> +}
> +
> +static void cdns3_exit_roles(struct cdns3 *cdns)
> +{
> + cdns3_role_stop(cdns);
> + cdns3_drd_exit(cdns);
> +}
> +
> +/**
> + * cdns3_core_init_role - initialize role of operation
> + * @cdns: Pointer to cdns3 structure
> + *
> + * Returns 0 on success otherwise negative errno
> + */
> +static int cdns3_core_init_role(struct cdns3 *cdns)
> +{
> + struct device *dev = cdns->dev;
> + enum usb_dr_mode best_dr_mode;
> + enum usb_dr_mode dr_mode;
> + int ret = 0;
> +
> + dr_mode = usb_get_dr_mode(dev);
> + cdns->role = CDNS3_ROLE_END;
> +
> + /*
> + * If driver can't read mode by means of usb_get_dr_mdoe function then
> + * chooses mode according with Kernel configuration. This setting
> + * can be restricted later depending on strap pin configuration.
> + */
> + if (dr_mode == USB_DR_MODE_UNKNOWN) {
> + if (IS_ENABLED(CONFIG_USB_CDNS3_HOST) &&
> + IS_ENABLED(CONFIG_USB_CDNS3_GADGET))
> + dr_mode = USB_DR_MODE_OTG;
> + else if (IS_ENABLED(CONFIG_USB_CDNS3_HOST))
> + dr_mode = USB_DR_MODE_HOST;
> + else if (IS_ENABLED(CONFIG_USB_CDNS3_GADGET))
> + dr_mode = USB_DR_MODE_PERIPHERAL;
> + }
> +
> + best_dr_mode = USB_DR_MODE_OTG;
> +
> + if (dr_mode == USB_DR_MODE_OTG) {
> + best_dr_mode = cdns->dr_mode;
> + } else if (cdns->dr_mode == USB_DR_MODE_OTG) {
> + best_dr_mode = dr_mode;
> + } else if (cdns->dr_mode != dr_mode) {
> + dev_err(dev, "Incorrect DRD configuration\n");
> + return -EINVAL;
> + }
> +
> + dr_mode = best_dr_mode;
> +
> + if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
> + ret = cdns3_host_init(cdns);
> + if (ret) {
> + dev_err(dev, "Host initialization failed with %d\n",
> + ret);
> + goto err;
> + }
> + }
> +
> + if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {
> + ret = cdns3_gadget_init(cdns);
> + if (ret) {
> + dev_err(dev, "Device initialization failed with %d\n",
> + ret);
> + goto err;
> + }
> + }
> +
> + cdns->desired_dr_mode = dr_mode;
> + cdns->dr_mode = dr_mode;
> + /*
> + * dr_mode could be change so DRD must update controller
> + * configuration
> + */
> + ret = cdns3_drd_update_mode(cdns);
> + if (ret)
> + goto err;
> +
> + cdns->role = cdns3_get_initial_role(cdns);
> +
> + ret = cdns3_role_start(cdns, cdns->role);
> + if (ret) {
> + dev_err(dev, "can't start %s role\n",
> + cdns3_get_current_role_driver(cdns)->name);
> + goto err;
> + }
> +
> + return ret;
> +err:
> + cdns3_exit_roles(cdns);
> + return ret;
> +}
> +
> +/**
> + * cdsn3_get_real_role - get real role of controller based on hardware settings.
> + * @cdns: Pointer to cdns3 structure
> + *
> + * Returns role
> + */
> +enum cdns3_roles cdsn3_get_real_role(struct cdns3 *cdns)
> +{
> + enum cdns3_roles role = CDNS3_ROLE_END;
> +
> + if (cdns->current_dr_mode == USB_DR_MODE_OTG) {
> + if (cdns3_get_id(cdns))
> + role = CDNS3_ROLE_GADGET;
> + else
> + role = CDNS3_ROLE_HOST;
> + } else {
> + if (cdns3_is_host(cdns))
> + role = CDNS3_ROLE_HOST;
> + if (cdns3_is_device(cdns))
> + role = CDNS3_ROLE_GADGET;
> + }
> +
> + return role;
> +}
> +
> +/**
> + * cdns3_role_switch - work queue handler for role switch
> + *
> + * @work: work queue item structure
> + *
> + * Handles below events:
> + * - Role switch for dual-role devices
> + * - CDNS3_ROLE_GADGET <--> CDNS3_ROLE_END for peripheral-only devices
> + */
> +static void cdns3_role_switch(struct work_struct *work)
> +{
> + enum cdns3_roles role = CDNS3_ROLE_END;
> + struct cdns3_role_driver *role_drv;
> + enum cdns3_roles current_role;
> + struct cdns3 *cdns;
> + int ret = 0;
> +
> + cdns = container_of(work, struct cdns3, role_switch_wq);
> +
> + /* During switching cdns->role can be different then role */
> + role = cdsn3_get_real_role(cdns);
> +
> + role_drv = cdns3_get_current_role_driver(cdns);
> +
> + pm_runtime_get_sync(cdns->dev);
> +
> + /* Disable current role. This state can be forced from user space. */
> + if (cdns->debug_disable && role_drv->state == CDNS3_ROLE_STATE_ACTIVE) {
> + cdns3_role_stop(cdns);
> + goto exit;
> + }
> +
> + /* Do nothing if nothing changed */
> + if (cdns->role == role && role_drv->state == CDNS3_ROLE_STATE_ACTIVE)
> + goto exit;
> +
> + cdns3_role_stop(cdns);
> +
> + role = cdsn3_get_real_role(cdns);
> +
> + current_role = cdns->role;
> + dev_dbg(cdns->dev, "Switching role");
> +
> + ret = cdns3_role_start(cdns, role);
> + if (ret) {
> + /* Back to current role */
> + dev_err(cdns->dev, "set %d has failed, back to %d\n",
> + role, current_role);
> + cdns3_role_start(cdns, current_role);
> + }
> +exit:
> + pm_runtime_put_sync(cdns->dev);
> +}
> +
> +/**
> + * cdns3_probe - probe for cdns3 core device
> + * @pdev: Pointer to cdns3 core platform device
> + *
> + * Returns 0 on success otherwise negative errno
> + */
> +static int cdns3_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct resource *res;
> + struct cdns3 *cdns;
> + void __iomem *regs;
> + int ret;
> +
> + cdns = devm_kzalloc(dev, sizeof(*cdns), GFP_KERNEL);
> + if (!cdns)
> + return -ENOMEM;
> +
> + cdns->dev = dev;
> +
> + platform_set_drvdata(pdev, cdns);
> +
> + res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> + if (!res) {
> + dev_err(dev, "missing IRQ\n");
> + return -ENODEV;
> + }
> + cdns->irq = res->start;
> +
> + cdns->xhci_res[0] = *res;
> +
> + /*
> + * Request memory region
> + * region-0: xHCI
> + * region-1: Peripheral
> + * region-2: OTG registers
> + */
the comment should be modified or removed if not necessary when codes
changed.
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "xhci");
> + if (!res)
> + return -ENXIO;
> +
> + cdns->xhci_res[1] = *res;
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dev");
> + regs = devm_ioremap_resource(dev, res);
> + if (IS_ERR(regs))
> + return PTR_ERR(regs);
> + cdns->dev_regs = regs;
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "otg");
> + if (!res)
> + return -ENXIO;
> +
> + cdns->otg_res = *res;
> +
> + mutex_init(&cdns->mutex);
> +
> + cdns->phy = devm_phy_optional_get(dev, "cdns3,usbphy");
> + if (IS_ERR(cdns->phy))
> + return PTR_ERR(cdns->phy);
> +
> + phy_init(cdns->phy);
check the return value? and
It's better to call phy_power_on() here even if the phy driver doesn't
provide power_on()

> +
> + INIT_WORK(&cdns->role_switch_wq, cdns3_role_switch);
> +
> + ret = cdns3_drd_init(cdns);
> + if (ret)
> + goto err;
> +
> + ret = cdns3_core_init_role(cdns);
> + if (ret)
> + goto err;
> +
> + cdns3_debugfs_init(cdns);
> + device_set_wakeup_capable(dev, true);
> + pm_runtime_set_active(dev);
> + pm_runtime_enable(dev);
> +
> + /*
> + * The controller needs less time between bus and controller suspend,
> + * and we also needs a small delay to avoid frequently entering low
> + * power mode.
> + */
> + pm_runtime_set_autosuspend_delay(dev, 20);
> + pm_runtime_mark_last_busy(dev);
> + pm_runtime_use_autosuspend(dev);
> + dev_dbg(dev, "Cadence USB3 core: probe succeed\n");
> +
> + return 0;
> +
> +err:
> + phy_exit(cdns->phy);
> + return ret;
> +}
> +
> +/**
> + * cdns3_remove - unbind drd driver and clean up
> + * @pdev: Pointer to Linux platform device
> + *
> + * Returns 0 on success otherwise negative errno
> + */
> +static int cdns3_remove(struct platform_device *pdev)
> +{
> + struct cdns3 *cdns = platform_get_drvdata(pdev);
> +
> + pm_runtime_get_sync(&pdev->dev);
> + pm_runtime_disable(&pdev->dev);
> + pm_runtime_put_noidle(&pdev->dev);
> + cdns3_debugfs_exit(cdns);
> + cdns3_exit_roles(cdns);
> + phy_exit(cdns->phy);
> + return 0;
> +}
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id of_cdns3_match[] = {
> + { .compatible = "cdns,usb3-1.0.0" },
> + { .compatible = "cdns,usb3-1.0.1" },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, of_cdns3_match);
> +#endif
> +
> +static struct platform_driver cdns3_driver = {
> + .probe = cdns3_probe,
> + .remove = cdns3_remove,
> + .driver = {
> + .name = "cdns-usb3",
> + .of_match_table = of_match_ptr(of_cdns3_match),
> + },
> +};
> +
> +module_platform_driver(cdns3_driver);
> +
> +MODULE_ALIAS("platform:cdns3");
> +MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>");
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("Cadence USB3 DRD Controller Driver");
> diff --git a/drivers/usb/cdns3/core.h b/drivers/usb/cdns3/core.h
> new file mode 100644
> index 000000000000..fb4b39206158
> --- /dev/null
> +++ b/drivers/usb/cdns3/core.h
> @@ -0,0 +1,116 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Cadence USBSS DRD Header File.
> + *
> + * Copyright (C) 2017-2018 NXP
> + * Copyright (C) 2018 Cadence.
> + *
> + * Authors: Peter Chen <peter.chen@nxp.com>
> + * Pawel Laszczak <pawell@cadence.com>
> + */
> +#include <linux/usb/otg.h>
> +
> +#ifndef __LINUX_CDNS3_CORE_H
> +#define __LINUX_CDNS3_CORE_H
> +
> +struct cdns3;
> +enum cdns3_roles {
> + CDNS3_ROLE_HOST = 0,
> + CDNS3_ROLE_GADGET,
> + CDNS3_ROLE_END,
> +};
> +
> +/**
> + * struct cdns3_role_driver - host/gadget role driver
> + * @start: start this role
> + * @stop: stop this role
> + * @suspend: suspend callback for this role
> + * @resume: resume callback for this role
> + * @irq: irq handler for this role
no irq member,
> + * @name: role name string (host/gadget)
> + * @state: current state
> + */
> +struct cdns3_role_driver {
> + int (*start)(struct cdns3 *cdns);
> + void (*stop)(struct cdns3 *cdns);
> + int (*suspend)(struct cdns3 *cdns, bool do_wakeup);
> + int (*resume)(struct cdns3 *cdns, bool hibernated);
> + const char *name;
> +#define CDNS3_ROLE_STATE_INACTIVE 0
> +#define CDNS3_ROLE_STATE_ACTIVE 1
> + int state;
> +};
> +
> +#define CDNS3_XHCI_RESOURCES_NUM 2
> +/**
> + * struct cdns3 - Representation of Cadence USB3 DRD controller.
> + * @dev: pointer to Cadence device struct
> + * @xhci_regs: pointer to base of xhci registers
> + * @xhci_res: the resource for xhci
> + * @dev_regs: pointer to base of dev registers
> + * @otg_regs: pointer to base of otg registers
not pointer
> + * @irq: irq number for controller
> + * @roles: array of supported roles for this controller
> + * @role: current role
> + * @host_dev: the child host device pointer for cdns3 core
> + * @gadget_dev: the child gadget device pointer for cdns3 core
> + * @usb: phy for this controller
> + * @role_switch_wq: work queue item for role switch
> + * @in_lpm: the controller in low power mode
> + * @wakeup_int: the wakeup interrupt
> + * @mutex: the mutex for concurrent code at driver
> + * @dr_mode: supported mode of operation it can be only Host, only Device
> + * or OTG mode that allow to switch between Device and Host mode.
> + * This field based on firmware setting, kernel configuration
> + * and hardware configuration.
> + * @current_dr_mode: current mode of operation when in dual-role mode
> + * @desired_dr_mode: desired mode of operation when in dual-role mode.
> + * This value can be changed during runtime.
> + * Available options depends on dr_mode:
> + * dr_mode | desired_dr_mode and current_dr_mode
> + * ----------------------------------------------------------------
> + * USB_DR_MODE_HOST | only USB_DR_MODE_HOST
> + * USB_DR_MODE_PERIPHERAL | only USB_DR_MODE_PERIPHERAL
> + * USB_DR_MODE_OTG | only USB_DR_MODE_HOST
> + * USB_DR_MODE_OTG | only USB_DR_MODE_PERIPHERAL
> + * USB_DR_MODE_OTG | USB_DR_MODE_OTG
> + *
> + * Desired_dr_role can be changed by means of debugfs.
> + * @root: debugfs root folder pointer
> + * @debug_disable:
> + */
> +struct cdns3 {
> + struct device *dev;
> + void __iomem *xhci_regs;
> + struct resource xhci_res[CDNS3_XHCI_RESOURCES_NUM];
> + struct cdns3_usb_regs __iomem *dev_regs;
> +
> + struct resource otg_res;
> + struct cdns3_otg_legacy_regs *otg_v0_regs;
> + struct cdns3_otg_regs *otg_v1_regs;
> + struct cdns3_otg_common_regs *otg_regs;
> +#define CDNS3_CONTROLLER_V0 0
> +#define CDNS3_CONTROLLER_V1 1
> + u32 version;
> +
> + int irq;
> + struct cdns3_role_driver *roles[CDNS3_ROLE_END];
> + enum cdns3_roles role;
> + struct platform_device *host_dev;
> + struct cdns3_device *gadget_dev;
> + struct phy *phy;
Does the single phy support both HS and SS?
> + struct work_struct role_switch_wq;
> + int in_lpm:1;
> + int wakeup_int:1;
> + /* mutext used in workqueue*/
> + struct mutex mutex;
> + enum usb_dr_mode dr_mode;
> + enum usb_dr_mode current_dr_mode;
> + enum usb_dr_mode desired_dr_mode;
> + struct dentry *root;
> + int debug_disable:1;
> +};
> +
> +void cdns3_role_stop(struct cdns3 *cdns);
> +
> +#endif /* __LINUX_CDNS3_CORE_H */
> diff --git a/drivers/usb/cdns3/debug.h b/drivers/usb/cdns3/debug.h
> new file mode 100644
> index 000000000000..1929edb3a521
> --- /dev/null
> +++ b/drivers/usb/cdns3/debug.h
> @@ -0,0 +1,168 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Cadence USBSS DRD Driver.
> + * Debug header file.
> + *
> + * Copyright (C) 2018 Cadence.
> + *
> + * Author: Pawel Laszczak <pawell@cadence.com>
> + */
> +#ifndef __LINUX_CDNS3_DEBUG
> +#define __LINUX_CDNS3_DEBUG
> +
> +#include "core.h"
> +
> +static inline char *cdns3_decode_usb_irq(char *str,
> + enum usb_device_speed speed,
> + u32 usb_ists)
> +{
> + int ret;
> +
> + ret = sprintf(str, "IRQ %08x = ", usb_ists);
> +
> + if (usb_ists & (USB_ISTS_CON2I | USB_ISTS_CONI)) {
> + ret += sprintf(str + ret, "Connection %s\n",
> + usb_speed_string(speed));
> + }
> + if (usb_ists & USB_ISTS_CON2I || usb_ists & USB_ISTS_CONI)
> + ret += sprintf(str + ret, "Disconnection ");
> + if (usb_ists & USB_ISTS_L2ENTI)
> + ret += sprintf(str + ret, "suspended ");
> +
> + if (usb_ists & USB_ISTS_L2EXTI)
> + ret += sprintf(str + ret, "L2 exit ");
> + if (usb_ists & USB_ISTS_U3EXTI)
> + ret += sprintf(str + ret, "U3 exit ");
> + if (usb_ists & USB_ISTS_UWRESI)
> + ret += sprintf(str + ret, "Warm Reset ");
> + if (usb_ists & USB_ISTS_UHRESI)
> + ret += sprintf(str + ret, "Hot Reset ");
> + if (usb_ists & USB_ISTS_U2RESI)
> + ret += sprintf(str + ret, "Reset");
> +
> + return str;
> +}
> +
> +static inline char *cdns3_decode_ep_irq(char *str,
> + u32 ep_sts,
> + const char *ep_name)
> +{
> + int ret;
> +
> + ret = sprintf(str, "IRQ for %s: %08x ", ep_name, ep_sts);
> +
> + if (ep_sts & EP_STS_SETUP)
> + ret += sprintf(str + ret, "SETUP ");
> + if (ep_sts & EP_STS_IOC)
> + ret += sprintf(str + ret, "IOC ");
> + if (ep_sts & EP_STS_ISP)
> + ret += sprintf(str + ret, "ISP ");
> + if (ep_sts & EP_STS_DESCMIS)
> + ret += sprintf(str + ret, "DESCMIS ");
> + if (ep_sts & EP_STS_STREAMR)
> + ret += sprintf(str + ret, "STREAMR ");
> + if (ep_sts & EP_STS_MD_EXIT)
> + ret += sprintf(str + ret, "MD_EXIT ");
> + if (ep_sts & EP_STS_TRBERR)
> + ret += sprintf(str + ret, "TRBERR ");
> + if (ep_sts & EP_STS_NRDY)
> + ret += sprintf(str + ret, "NRDY ");
> + if (ep_sts & EP_STS_PRIME)
> + ret += sprintf(str + ret, "PRIME ");
> + if (ep_sts & EP_STS_SIDERR)
> + ret += sprintf(str + ret, "SIDERRT ");
> + if (ep_sts & EP_STS_OUTSMM)
> + ret += sprintf(str + ret, "OUTSMM ");
> + if (ep_sts & EP_STS_ISOERR)
> + ret += sprintf(str + ret, "ISOERR ");
> + if (ep_sts & EP_STS_IOT)
> + ret += sprintf(str + ret, "IOT ");
> +
> + return str;
> +}
> +
> +static inline char *cdns3_decode_epx_irq(char *str,
> + char *ep_name,
> + u32 ep_sts)
> +{
> + return cdns3_decode_ep_irq(str, ep_sts, ep_name);
> +}
> +
> +static inline char *cdns3_decode_ep0_irq(char *str,
> + int dir,
> + u32 ep_sts)
> +{
> + return cdns3_decode_ep_irq(str, ep_sts,
> + dir ? "ep0IN" : "ep0OUT");
> +}
> +
> +/**
> + * Debug a transfer ring.
> + *
> + * Prints out all TRBs in the endpoint ring, even those after the Link TRB.
> + *.
> + */
> +static inline char *cdns3_dbg_ring(struct cdns3_endpoint *priv_ep,
> + struct cdns3_trb *ring, char *str)
> +{
> + dma_addr_t addr = priv_ep->trb_pool_dma;
> + struct cdns3_trb *trb;
> + int trb_per_sector;
> + int ret = 0;
> + int i;
> +
> + trb_per_sector = GET_TRBS_PER_SEGMENT(priv_ep->type);
> +
> + trb = &priv_ep->trb_pool[priv_ep->dequeue];
> + ret += sprintf(str + ret, "\n\t\tRing contents for %s:", priv_ep->name);
> +
> + ret += sprintf(str + ret,
> + "\n\t\tRing deq index: %d, trb: %p (virt), 0x%llx (dma)\n",
> + priv_ep->dequeue, trb,
> + (unsigned long long)cdns3_trb_virt_to_dma(priv_ep, trb));
> +
> + trb = &priv_ep->trb_pool[priv_ep->enqueue];
> + ret += sprintf(str + ret,
> + "\t\tRing enq index: %d, trb: %p (virt), 0x%llx (dma)\n",
> + priv_ep->enqueue, trb,
> + (unsigned long long)cdns3_trb_virt_to_dma(priv_ep, trb));
> +
> + ret += sprintf(str + ret,
> + "\t\tfree trbs: %d, CCS=%d, PCS=%d\n",
> + priv_ep->free_trbs, priv_ep->ccs, priv_ep->pcs);
> +
> + if (trb_per_sector > TRBS_PER_SEGMENT)
> + trb_per_sector = TRBS_PER_SEGMENT;
> +
> + if (trb_per_sector > TRBS_PER_SEGMENT) {
> + sprintf(str + ret, "\t\tTo big transfer ring %d\n",
> + trb_per_sector);
> + return str;
> + }
> +
> + for (i = 0; i < trb_per_sector; ++i) {
> + trb = &ring[i];
> + ret += sprintf(str + ret,
> + "\t\t@%pad %08x %08x %08x\n", &addr,
> + le32_to_cpu(trb->buffer),
> + le32_to_cpu(trb->length),
> + le32_to_cpu(trb->control));
> + addr += sizeof(*trb);
> + }
> +
> + return str;
> +}
> +
> +void cdns3_dbg(struct cdns3_device *priv_dev, const char *fmt, ...);
> +
> +#ifdef CONFIG_DEBUG_FS
> +void cdns3_debugfs_init(struct cdns3 *cdns);
> +void cdns3_debugfs_exit(struct cdns3 *cdns);
> +#else
> +void cdns3_debugfs_init(struct cdns3 *cdns);
> +{ }
> +void cdns3_debugfs_exit(struct cdns3 *cdns);
> +{ }
> +#endif
> +
> +#endif /*__LINUX_CDNS3_DEBUG*/
> diff --git a/drivers/usb/cdns3/debugfs.c b/drivers/usb/cdns3/debugfs.c
> new file mode 100644
> index 000000000000..d8fcd90d05b3
> --- /dev/null
> +++ b/drivers/usb/cdns3/debugfs.c
> @@ -0,0 +1,164 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Cadence USBSS DRD Controller DebugFS filer.
> + *
> + * Copyright (C) 2018 Cadence.
> + *
> + * Author: Pawel Laszczak <pawell@cadence.com>
> + */
> +
> +#include <linux/types.h>
> +#include <linux/debugfs.h>
> +#include <linux/seq_file.h>
> +#include <linux/uaccess.h>
> +
> +#include "core.h"
> +#include "gadget.h"
> +#include "drd.h"
> +
> +static int cdns3_mode_show(struct seq_file *s, void *unused)
> +{
> + struct cdns3 *cdns = s->private;
> +
> + switch (cdns->current_dr_mode) {
> + case USB_DR_MODE_HOST:
> + seq_puts(s, "host\n");
> + break;
> + case USB_DR_MODE_PERIPHERAL:
> + seq_puts(s, "device\n");
> + break;
> + case USB_DR_MODE_OTG:
> + seq_puts(s, "otg\n");
> + break;
> + default:
> + seq_puts(s, "UNKNOWN mode\n");
> + }
> +
> + return 0;
> +}
> +
> +static int cdns3_mode_open(struct inode *inode, struct file *file)
> +{
> + return single_open(file, cdns3_mode_show, inode->i_private);
> +}
> +
> +static ssize_t cdns3_mode_write(struct file *file,
> + const char __user *ubuf,
> + size_t count, loff_t *ppos)
> +{
> + struct seq_file *s = file->private_data;
> + struct cdns3 *cdns = s->private;
> + u32 mode = USB_DR_MODE_UNKNOWN;
> + char buf[32];
> +
> + if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
> + return -EFAULT;
> +
> + if (!strncmp(buf, "host", 4)) {
> + if (cdns->dr_mode == USB_DR_MODE_HOST ||
> + cdns->dr_mode == USB_DR_MODE_OTG) {
> + mode = USB_DR_MODE_HOST;
> + }
> + }
> +
> + if (!strncmp(buf, "device", 6))
> + if (cdns->dr_mode == USB_DR_MODE_PERIPHERAL ||
> + cdns->dr_mode == USB_DR_MODE_OTG)
> + mode = USB_DR_MODE_PERIPHERAL;
> +
> + if (!strncmp(buf, "otg", 3) && cdns->dr_mode == USB_DR_MODE_OTG)
> + mode = USB_DR_MODE_OTG;
> +
> + if (mode == USB_DR_MODE_UNKNOWN) {
> + dev_err(cdns->dev, "Failed: incorrect mode setting\n");
> + return -EFAULT;
> + }
> +
> + if (cdns->current_dr_mode != mode) {
> + cdns->desired_dr_mode = mode;
> + cdns->debug_disable = 0;
> + cdns3_role_stop(cdns);
> + cdns3_drd_update_mode(cdns);
> + queue_work(system_freezable_wq, &cdns->role_switch_wq);
> + }
> +
> + return count;
> +}
> +
> +static const struct file_operations cdns3_mode_fops = {
> + .open = cdns3_mode_open,
> + .write = cdns3_mode_write,
> + .read = seq_read,
> + .llseek = seq_lseek,
> + .release = single_release,
> +};
> +
> +static int cdns3_disable_show(struct seq_file *s, void *unused)
> +{
> + struct cdns3 *cdns = s->private;
> +
> + if (!cdns->debug_disable)
> + seq_puts(s, "0\n");
> + else
> + seq_puts(s, "1\n");
> +
> + return 0;
> +}
> +
> +static ssize_t cdns3_disable_write(struct file *file,
> + const char __user *ubuf,
> + size_t count, loff_t *ppos)
> +{
> + struct seq_file *s = file->private_data;
> + struct cdns3 *cdns = s->private;
> + bool disable;
> + char buf[16];
> +
> + if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
> + return -EFAULT;
> +
> + if (kstrtobool(buf, &disable)) {
> + dev_err(cdns->dev, "wrong setting\n");
> + return -EINVAL;
> + }
> +
> + if (disable != cdns->debug_disable) {
> + cdns->debug_disable = disable;
> + queue_work(system_freezable_wq, &cdns->role_switch_wq);
> + }
> +
> + return count;
> +}
> +
> +static int cdns3_disable_open(struct inode *inode, struct file *file)
> +{
> + return single_open(file, cdns3_disable_show, inode->i_private);
> +}
> +
> +static const struct file_operations cdns3_disable_fops = {
> + .open = cdns3_disable_open,
> + .write = cdns3_disable_write,
> + .read = seq_read,
> + .llseek = seq_lseek,
> + .release = single_release,
> +};
> +
> +void cdns3_debugfs_init(struct cdns3 *cdns)
> +{
> + struct dentry *root;
> +
> + root = debugfs_create_dir(dev_name(cdns->dev), NULL);
> + cdns->root = root;
> + if (IS_ENABLED(CONFIG_USB_CDNS3_GADGET) &&
> + IS_ENABLED(CONFIG_USB_CDNS3_HOST))
> + debugfs_create_file("mode", 0644, root, cdns,
> + &cdns3_mode_fops);
> +
> + debugfs_create_file("disable", 0644, root, cdns,
> + &cdns3_disable_fops);
> +}
> +
> +void cdns3_debugfs_exit(struct cdns3 *cdns)
> +{
> + debugfs_remove_recursive(cdns->root);
> +}
> diff --git a/drivers/usb/cdns3/drd.c b/drivers/usb/cdns3/drd.c
> new file mode 100644
> index 000000000000..3e56338cd7b9
> --- /dev/null
> +++ b/drivers/usb/cdns3/drd.c
> @@ -0,0 +1,365 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Cadence USBSS DRD Driver.
> + *
> + * Copyright (C) 2018 Cadence.
> + *
> + * Author: Pawel Laszczak <pawell@cadence.com
> + *
> + */
> +#include <linux/kernel.h>
> +#include <linux/interrupt.h>
> +#include <linux/delay.h>
> +#include <linux/usb/otg.h>
> +
> +#include "gadget.h"
> +#include "drd.h"
> +#include "core.h"
> +
> +static int cdns3_drd_switch_gadget(struct cdns3 *cdns, int on);
> +static int cdns3_drd_switch_host(struct cdns3 *cdns, int on);
> +
> +/**
> + * cdns3_set_mode - change mode of OTG Core
> + * @cdns: pointer to context structure
> + * @mode: selected mode from cdns_role
> + *
> + * Returns 0 on success otherwise negative errno
> + */
> +int cdns3_set_mode(struct cdns3 *cdns, enum usb_dr_mode mode)
> +{
> + int ret = 0;
> + u32 reg;
> +
> + cdns->current_dr_mode = mode;
> +
> + switch (mode) {
> + case USB_DR_MODE_PERIPHERAL:
> + dev_info(cdns->dev, "Set controller to Gadget mode\n");
> + ret = cdns3_drd_switch_gadget(cdns, 1);
> + break;
> + case USB_DR_MODE_HOST:
> + dev_info(cdns->dev, "Set controller to Host mode\n");
> + ret = cdns3_drd_switch_host(cdns, 1);
> + break;
> + case USB_DR_MODE_OTG:
> + dev_info(cdns->dev, "Set controller to OTG mode\n");
> + if (cdns->version == CDNS3_CONTROLLER_V1) {
> + reg = readl(&cdns->otg_v1_regs->override);
> + reg |= OVERRIDE_IDPULLUP;
> + writel(reg, &cdns->otg_v1_regs->override);
> + } else {
> + reg = readl(&cdns->otg_v0_regs->ctrl1);
> + reg |= OVERRIDE_IDPULLUP_V0;
> + writel(reg, &cdns->otg_v0_regs->ctrl1);
> + }
> +
> + /*
> + * Hardware specification says: "ID_VALUE must be valid within
> + * 50ms after idpullup is set to '1" so driver must wait
> + * 50ms before reading this pin.
> + */
> + usleep_range(50000, 60000);
> + break;
> + default:
> + cdns->current_dr_mode = USB_DR_MODE_UNKNOWN;
> + dev_err(cdns->dev, "Unsupported mode of operation %d\n", mode);
> + return -EINVAL;
> + }
> +
> + return ret;
> +}
> +
> +int cdns3_get_id(struct cdns3 *cdns)
> +{
> + int id;
> +
> + id = readl(&cdns->otg_regs->sts) & OTGSTS_ID_VALUE;
> + dev_dbg(cdns->dev, "OTG ID: %d", id);
> + return id;
> +}
> +
> +int cdns3_is_host(struct cdns3 *cdns)
maybe it's better to use bool instead of int
> +{
> + if (cdns->current_dr_mode == USB_DR_MODE_HOST)
> + return 1;
> + else if (!cdns3_get_id(cdns))
> + return 1;
> +
> + return 0;
> +}
> +
> +int cdns3_is_device(struct cdns3 *cdns)
ditto
> +{
> + if (cdns->current_dr_mode == USB_DR_MODE_PERIPHERAL)
> + return 1;
> + else if (cdns->current_dr_mode == USB_DR_MODE_OTG)
> + if (cdns3_get_id(cdns))
> + return 1;
> +
> + return 0;
> +}
> +
> +/**
> + * cdns3_otg_disable_irq - Disable all OTG interrupts
> + * @cdns: Pointer to controller context structure
> + */
> +static void cdns3_otg_disable_irq(struct cdns3 *cdns)
> +{
> + writel(0, &cdns->otg_regs->ien);
> +}
> +
> +/**
> + * cdns3_otg_enable_irq - enable id and sess_valid interrupts
> + * @cdns: Pointer to controller context structure
> + */
> +static void cdns3_otg_enable_irq(struct cdns3 *cdns)
> +{
> + writel(OTGIEN_ID_CHANGE_INT | OTGIEN_VBUSVALID_RISE_INT |
> + OTGIEN_VBUSVALID_FALL_INT, &cdns->otg_regs->ien);
> +}
> +
> +/**
> + * cdns3_drd_switch_host - start/stop host
> + * @cdns: Pointer to controller context structure
> + * @on: 1 for start, 0 for stop
> + *
> + * Returns 0 on success otherwise negative errno
> + */
[...]
> +DEFINE_EVENT(cdns3_log_request_handled, cdns3_request_handled,
> + TP_PROTO(struct cdns3_request *priv_req, int current_index,
> + int handled),
> + TP_ARGS(priv_req, current_index, handled)
> +);
> +#endif /* __LINUX_CDNS3_TRACE */
> +
> +/* this part must be outside header guard */
> +
> +#undef TRACE_INCLUDE_PATH
> +#define TRACE_INCLUDE_PATH .
> +
> +#undef TRACE_INCLUDE_FILE
> +#define TRACE_INCLUDE_FILE trace
> +
> +#include <trace/define_trace.h>


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