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Message-ID: <88742d5b-ee10-cf4e-6724-58e7bdd19cb9@ti.com>
Date: Wed, 7 Aug 2019 15:08:33 +0300
From: Roger Quadros <rogerq@...com>
To: Pawel Laszczak <pawell@...ence.com>, <felipe.balbi@...ux.intel.com>
CC: <gregkh@...uxfoundation.org>, <linux-usb@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <jbergsagel@...com>,
<nsekhar@...com>, <nm@...com>, <sureshp@...ence.com>,
<jpawar@...ence.com>, <kurahul@...ence.com>, <aniljoy@...ence.com>,
"heikki.krogerus@...ux.intel.com" <heikki.krogerus@...ux.intel.com>
Subject: Re: [PATCH v10 5/6] usb:cdns3 Add Cadence USB3 DRD Driver
Pawel,
On 21/07/2019 21:32, Pawel Laszczak wrote:
> This patch introduce new Cadence USBSS DRD driver to Linux kernel.
>
> The Cadence USBSS DRD Controller is a highly configurable IP Core which
> can be instantiated as Dual-Role Device (DRD), Peripheral Only and
> Host Only (XHCI)configurations.
>
> The current driver has been validated with FPGA platform. We have
> support for PCIe bus, which is used on FPGA prototyping.
>
> The host side of USBSS-DRD controller is compliant with XHCI
> specification, so it works with standard XHCI Linux driver.
>
> Signed-off-by: Pawel Laszczak <pawell@...ence.com>
> ---
> drivers/usb/Kconfig | 2 +
> drivers/usb/Makefile | 2 +
> drivers/usb/cdns3/Kconfig | 46 +
> drivers/usb/cdns3/Makefile | 17 +
> drivers/usb/cdns3/cdns3-pci-wrap.c | 203 +++
> drivers/usb/cdns3/core.c | 554 +++++++
> drivers/usb/cdns3/core.h | 109 ++
> drivers/usb/cdns3/debug.h | 171 ++
> drivers/usb/cdns3/debugfs.c | 87 ++
> drivers/usb/cdns3/drd.c | 390 +++++
> drivers/usb/cdns3/drd.h | 166 ++
> drivers/usb/cdns3/ep0.c | 914 +++++++++++
> drivers/usb/cdns3/gadget-export.h | 28 +
> drivers/usb/cdns3/gadget.c | 2338 ++++++++++++++++++++++++++++
> drivers/usb/cdns3/gadget.h | 1321 ++++++++++++++++
> drivers/usb/cdns3/host-export.h | 28 +
> drivers/usb/cdns3/host.c | 71 +
> drivers/usb/cdns3/trace.c | 11 +
> drivers/usb/cdns3/trace.h | 493 ++++++
> 19 files changed, 6951 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 e4b27413f528..c2e78882f8c2 100644
> --- a/drivers/usb/Kconfig
> +++ b/drivers/usb/Kconfig
> @@ -113,6 +113,8 @@ 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..d0331613a355
> --- /dev/null
> +++ b/drivers/usb/cdns3/Kconfig
> @@ -0,0 +1,46 @@
> +config USB_CDNS3
> + tristate "Cadence USB3 Dual-Role Controller"
> + depends on USB_SUPPORT && (USB || USB_GADGET) && HAS_DMA
> + select USB_XHCI_PLATFORM if USB_XHCI_HCD
> + select USB_ROLE_SWITCH
> + 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=y || USB_GADGET=USB_CDNS3
> + 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
s/FF/FS
> + LS and SSP mode.
> +
> +config USB_CDNS3_HOST
> + bool "Cadence USB3 host controller"
> + depends on USB=y || USB=USB_CDNS3
> + 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..6c58660b9cd1
> --- /dev/null
> +++ b/drivers/usb/cdns3/Makefile
> @@ -0,0 +1,17 @@
> +# SPDX-License-Identifier: GPL-2.0
> +# define_trace.h needs to know how to find our header
> +CFLAGS_trace.o := -I$(src)
> +
> +cdns3-y := core.o drd.o
> +
> +obj-$(CONFIG_USB_CDNS3) += cdns3.o
> +cdns3-$(CONFIG_DEBUG_FS) += debugfs.o
> +cdns3-$(CONFIG_USB_CDNS3_GADGET) += gadget.o ep0.o
> +
> +ifneq ($(CONFIG_USB_CDNS3_GADGET),)
> +cdns3-$(CONFIG_TRACING) += trace.o
> +endif
> +
> +cdns3-$(CONFIG_USB_CDNS3_HOST) += host.o
> +
> +obj-$(CONFIG_USB_CDNS3_PCI_WRAP) += cdns3-pci-wrap.o
> diff --git a/drivers/usb/cdns3/cdns3-pci-wrap.c b/drivers/usb/cdns3/cdns3-pci-wrap.c
> new file mode 100644
> index 000000000000..c41ddb61b857
> --- /dev/null
> +++ b/drivers/usb/cdns3/cdns3-pci-wrap.c
> @@ -0,0 +1,203 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Cadence USBSS PCI Glue driver
> + *
> + * Copyright (C) 2018-2019 Cadence.
> + *
> + * Author: Pawel Laszczak <pawell@...ence.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 resource dev_res[6];
> + int devfn;
> +};
> +
> +#define RES_IRQ_HOST_ID 0
> +#define RES_IRQ_PERIPHERAL_ID 1
> +#define RES_IRQ_OTG_ID 2
> +#define RES_HOST_ID 3
> +#define RES_DEV_ID 4
> +#define RES_DRD_ID 5
> +
> +#define PCI_BAR_HOST 0
> +#define PCI_BAR_DEV 2
> +#define PCI_BAR_OTG 0
> +
> +#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
> +
> +static struct pci_dev *cdns3_get_second_fun(struct pci_dev *pdev)
> +{
> + struct pci_dev *func;
> +
> + /*
> + * Gets the second function.
> + * It's little tricky, but this platform has two function.
> + * The fist keeps resources for Host/Device while the second
> + * keeps resources for DRD/OTG.
> + */
> + func = pci_get_device(pdev->vendor, pdev->device, NULL);
> + if (unlikely(!func))
> + return NULL;
> +
> + if (func->devfn == pdev->devfn) {
> + func = pci_get_device(pdev->vendor, pdev->device, func);
> + if (unlikely(!func))
> + return NULL;
> + }
> +
> + return func;
> +}
> +
> +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;
> + struct pci_dev *func;
> + 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 &&
> + pdev->devfn != PCI_DEV_FN_OTG))
> + return -EINVAL;
> +
> + func = cdns3_get_second_fun(pdev);
> + if (unlikely(!func))
> + 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);
> +
> + if (pci_is_enabled(func)) {
> + wrap = pci_get_drvdata(func);
> + } else {
> + wrap = kzalloc(sizeof(*wrap), GFP_KERNEL);
> + if (!wrap) {
> + pci_disable_device(pdev);
> + return -ENOMEM;
> + }
> + }
> +
> + res = wrap->dev_res;
> +
> + if (pdev->devfn == PCI_DEV_FN_HOST_DEVICE) {
> + /* function 0: host(BAR_0) + device(BAR_1).*/
> + dev_dbg(&pdev->dev, "Initialize Device resources\n");
> + 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);
> +
> + /* Interrupt for XHCI */
> + wrap->dev_res[RES_IRQ_HOST_ID].start = pdev->irq;
> + wrap->dev_res[RES_IRQ_HOST_ID].name = "host";
> + wrap->dev_res[RES_IRQ_HOST_ID].flags = IORESOURCE_IRQ;
> +
> + /* Interrupt device. It's the same as for HOST. */
> + wrap->dev_res[RES_IRQ_PERIPHERAL_ID].start = pdev->irq;
> + wrap->dev_res[RES_IRQ_PERIPHERAL_ID].name = "peripheral";
> + wrap->dev_res[RES_IRQ_PERIPHERAL_ID].flags = IORESOURCE_IRQ;
> + } else {
> + 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 for OTG/DRD. */
> + wrap->dev_res[RES_IRQ_OTG_ID].start = pdev->irq;
> + wrap->dev_res[RES_IRQ_OTG_ID].name = "otg";
> + wrap->dev_res[RES_IRQ_OTG_ID].flags = IORESOURCE_IRQ;
> + }
> +
> + if (pci_is_enabled(func)) {
> + /* 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;
> + wrap->devfn = 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)) {
> + pci_disable_device(pdev);
> + kfree(wrap);
> + return PTR_ERR(wrap->plat_dev);
> + }
> + }
> +
> + pci_set_drvdata(pdev, wrap);
> + return err;
> +}
> +
> +static void cdns3_pci_remove(struct pci_dev *pdev)
> +{
> + struct cdns3_wrap *wrap;
> + struct pci_dev *func;
> +
> + func = cdns3_get_second_fun(pdev);
> +
> + wrap = (struct cdns3_wrap *)pci_get_drvdata(pdev);
> + if (wrap->devfn == pdev->devfn)
> + platform_device_unregister(wrap->plat_dev);
> +
> + if (!pci_is_enabled(func))
> + kfree(wrap);
> +}
> +
> +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@...ence.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..900b2ce08162
> --- /dev/null
> +++ b/drivers/usb/cdns3/core.c
> @@ -0,0 +1,554 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Cadence USBSS DRD Driver.
> + *
> + * Copyright (C) 2018-2019 Cadence.
> + * Copyright (C) 2017-2018 NXP
> + * Copyright (C) 2019 Texas Instruments
> + *
> + * Author: Peter Chen <peter.chen@....com>
> + * Pawel Laszczak <pawell@...ence.com>
> + * Roger Quadros <rogerq@...com>
> + */
> +
> +#include <linux/dma-mapping.h>
> +#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->roles[cdns->role]);
> + return cdns->roles[cdns->role];
> +}
> +
> +static int cdns3_role_start(struct cdns3 *cdns, enum usb_role role)
> +{
> + int ret;
> +
> + if (WARN_ON(role > USB_ROLE_DEVICE))
> + return 0;
> +
> + mutex_lock(&cdns->mutex);
> + cdns->role = role;
> + mutex_unlock(&cdns->mutex);
> +
> + if (role == USB_ROLE_NONE)
> + return 0;
> +
> + if (!cdns->roles[role])
> + return -ENXIO;
> +
> + if (cdns->roles[role]->state == CDNS3_ROLE_STATE_ACTIVE)
> + return 0;
> +
> + mutex_lock(&cdns->mutex);
> + if (role == USB_ROLE_HOST)
> + cdns3_drd_switch_host(cdns, 1);
> + else
> + cdns3_drd_switch_gadget(cdns, 1);
> +
> + ret = cdns->roles[role]->start(cdns);
> + if (!ret)
> + cdns->roles[role]->state = CDNS3_ROLE_STATE_ACTIVE;
> + mutex_unlock(&cdns->mutex);
> +
> + return ret;
> +}
> +
> +static void cdns3_role_stop(struct cdns3 *cdns)
> +{
> + enum usb_role role = cdns->role;
> +
> + if (WARN_ON(role > USB_ROLE_DEVICE))
> + return;
> +
> + if (role == USB_ROLE_NONE)
> + return;
> +
> + if (cdns->roles[role]->state == CDNS3_ROLE_STATE_INACTIVE)
> + return;
> +
> + mutex_lock(&cdns->mutex);
> + cdns->roles[role]->stop(cdns);
> + if (role == USB_ROLE_HOST)
> + cdns3_drd_switch_host(cdns, 0);
> + else
> + cdns3_drd_switch_gadget(cdns, 0);
> +
> + cdns->roles[role]->state = CDNS3_ROLE_STATE_INACTIVE;
> + mutex_unlock(&cdns->mutex);
> +}
> +
> +static void cdns3_exit_roles(struct cdns3 *cdns)
> +{
> + cdns3_role_stop(cdns);
> + cdns3_drd_exit(cdns);
> +}
> +
> +enum usb_role cdsn3_real_role_switch_get(struct device *dev);
> +
> +/**
> + * 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 = USB_ROLE_NONE;
> +
> + /*
> + * If driver can't read mode by means of usb_get_dr_mode 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;
> + }
> +
> + /*
> + * At this point cdns->dr_mode contains strap configuration.
> + * Driver try update this setting considering kernel configuration
> + */
> + best_dr_mode = cdns->dr_mode;
> +
> + 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;
> +
> + /*
> + * desired_dr_mode might have changed so we need to update
> + * the controller configuration"?
> + */
> + ret = cdns3_drd_update_mode(cdns);
> + if (ret)
> + goto err;
> +
> + cdns->role = cdsn3_real_role_switch_get(cdns->dev);
> +
> + 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_real_role_switch_get - get real role of controller based on hardware
> + * settings.
> + * @dev: Pointer to device structure
> + *
> + * Returns role
> + */
> +enum usb_role cdsn3_real_role_switch_get(struct device *dev)
> +{
> + struct cdns3 *cdns = dev_get_drvdata(dev);
> + enum usb_role role;
> + int id, vbus;
> +
> + if (cdns->current_dr_mode != USB_DR_MODE_OTG)
> + goto not_otg;
> +
> + id = cdns3_get_id(cdns);
> + vbus = cdns3_get_vbus(cdns);
> +
> + /*
> + * Role change state machine
> + * Inputs: ID, VBUS
> + * Previous state: cdns->role
> + * Next state: role
> + */
> + role = cdns->role;
> +
> + switch (role) {
> + case USB_ROLE_NONE:
> + /*
> + * Driver treat USB_ROLE_NONE synonymous to IDLE state from
> + * controller specification.
> + */
> + if (!id)
> + role = USB_ROLE_HOST;
> + else if (vbus)
> + role = USB_ROLE_DEVICE;
> + break;
> + case USB_ROLE_HOST: /* from HOST, we can only change to NONE */
> + if (id)
> + role = USB_ROLE_NONE;
> + break;
> + case USB_ROLE_DEVICE: /* from GADGET, we can only change to NONE*/
> + if (!vbus)
> + role = USB_ROLE_NONE;
> + break;
> + }
> +
> + dev_dbg(cdns->dev, "role %d -> %d\n", cdns->role, role);
> +
> + return role;
> +
> +not_otg:
> + if (cdns3_is_host(cdns))
> + role = USB_ROLE_HOST;
> + if (cdns3_is_device(cdns))
> + role = USB_ROLE_DEVICE;
> +
> + return role;
> +}
> +
> +/**
> + * cdns3_role_switch_set - work queue handler for role switch
> + *
> + * @dev: pointer to device object
> + * @role - the previous role
> + * Handles below events:
> + * - Role switch for dual-role devices
> + * - USB_ROLE_GADGET <--> USB_ROLE_NONE for peripheral-only devices
> + */
> +static int cdns3_role_switch_set(struct device *dev, enum usb_role role)
> +{
> + struct cdns3 *cdns = dev_get_drvdata(dev);
> + enum usb_role real_role = USB_ROLE_NONE;
> + enum usb_role current_role;
> + int ret = 0;
> +
> + /* Check if dr_mode was changed.*/
> + ret = cdns3_drd_update_mode(cdns);
> + if (ret)
> + return ret;
> +
> + pm_runtime_get_sync(cdns->dev);
> +
> + real_role = cdsn3_real_role_switch_get(cdns->dev);
> +
> + /* Do nothing if nothing changed */
> + if (cdns->role == real_role)
> + goto exit;
> +
> + cdns3_role_stop(cdns);
> +
> + real_role = cdsn3_real_role_switch_get(cdns->dev);
> +
> + current_role = role;
> + dev_dbg(cdns->dev, "Switching role");
> +
> + ret = cdns3_role_start(cdns, real_role);
> + if (ret) {
> + /* Back to current role */
> + dev_err(cdns->dev, "set %d has failed, back to %d\n",
> + role, current_role);
> + ret = cdns3_role_start(cdns, current_role);
> + if (ret)
> + dev_err(cdns->dev, "back to %d failed too\n",
> + current_role);
> + }
> +exit:
> + pm_runtime_put_sync(cdns->dev);
> + return ret;
> +}
> +
> +static const struct usb_role_switch_desc cdns3_switch_desc = {
> + .set = cdns3_role_switch_set,
> + .get = cdsn3_real_role_switch_get,
> + .allow_userspace_control = true,
how does user initiated cdns3_role_switch_set() via sysfs co-exist with role
changes done by hardware events. e.g. ID/VBUS?
> +};
> +
> +/**
> + * 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;
> +
> + ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
> + if (ret) {
> + dev_err(dev, "error setting dma mask: %d\n", ret);
> + return -ENODEV;
> + }
> +
> + cdns = devm_kzalloc(dev, sizeof(*cdns), GFP_KERNEL);
> + if (!cdns)
> + return -ENOMEM;
> +
> + cdns->dev = dev;
> +
> + platform_set_drvdata(pdev, cdns);
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "host");
> + if (!res) {
> + dev_err(dev, "missing host IRQ\n");
> + return -ENODEV;
> + }
> +
> + cdns->xhci_res[0] = *res;
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "xhci");
> + if (!res) {
> + dev_err(dev, "couldn't get xhci resource\n");
> + return -ENXIO;
> + }
> +
> + cdns->xhci_res[1] = *res;
> +
> + cdns->dev_irq = platform_get_irq_byname(pdev, "peripheral");
> + if (cdns->dev_irq == -EPROBE_DEFER)
> + return cdns->dev_irq;
> +
> + if (cdns->dev_irq < 0)
> + dev_err(dev, "couldn't get peripheral irq\n");
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dev");
> + regs = devm_ioremap_resource(dev, res);
> + if (IS_ERR(regs)) {
> + dev_err(dev, "couldn't iomap dev resource\n");
> + return PTR_ERR(regs);
> + }
> + cdns->dev_regs = regs;
> +
> + cdns->otg_irq = platform_get_irq_byname(pdev, "otg");
> + if (cdns->otg_irq == -EPROBE_DEFER)
> + return cdns->otg_irq;
> +
> + if (cdns->otg_irq < 0) {
> + dev_err(dev, "couldn't get otg irq\n");
> + return cdns->otg_irq;
> + }
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "otg");
> + if (!res) {
> + dev_err(dev, "couldn't get otg resource\n");
> + return -ENXIO;
> + }
> +
> + cdns->otg_res = *res;
> +
> + mutex_init(&cdns->mutex);
> +
> + cdns->usb2_phy = devm_phy_optional_get(dev, "cdns3,usb2-phy");
> + if (IS_ERR(cdns->usb2_phy))
> + return PTR_ERR(cdns->usb2_phy);
> +
> + phy_init(cdns->usb2_phy);
> + ret = phy_init(cdns->usb2_phy);
why phy_init() twice?
> + if (ret)
> + return ret;
> +
> + cdns->usb3_phy = devm_phy_optional_get(dev, "cdns3,usb3-phy");
> + if (IS_ERR(cdns->usb3_phy))
> + return PTR_ERR(cdns->usb3_phye t);
> +
> + phy_init(cdns->usb3_phy);
> + ret = phy_init(cdns->usb3_phy);
here too.
> + if (ret)
phy_exit(usb2_phy);
> + return ret;
> +
> + ret = phy_power_on(cdns->usb2_phy);
> + if (ret)
phy_exit on cleanup.
> + return ret;
> +
> + ret = phy_power_on(cdns->usb3_phy);
> + if (ret)
> + goto err1;
> +
> + cdns->role_sw = usb_role_switch_register(dev, &cdns3_switch_desc);
> + if (IS_ERR(cdns->role_sw)) {
> + ret = PTR_ERR(cdns->role_sw);
> + dev_warn(dev, "Unable to register Role Switch\n");
> + goto err2;
> + }
> +
> + ret = cdns3_drd_init(cdns);
> + if (ret)
> + goto err3;
> +
> + ret = cdns3_core_init_role(cdns);
> + if (ret)
cdns3_drd_exit();
> + goto err3;
> +
> + 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;
> +err3:
> + usb_role_switch_unregister(cdns->role_sw);
> +err2:
> + phy_power_off(cdns->usb3_phy);
> +
> +err1:
> + phy_power_off(cdns->usb2_phy);
> + phy_exit(cdns->usb2_phy);
> + phy_exit(cdns->usb3_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);
> + usb_role_switch_unregister(cdns->role_sw);
> + phy_power_off(cdns->usb2_phy);
> + phy_power_off(cdns->usb3_phy);
> + phy_exit(cdns->usb2_phy);
> + phy_exit(cdns->usb3_phy);
> + return 0;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +
> +static int cdns3_suspend(struct device *dev)
> +{
> + struct cdns3 *cdns = dev_get_drvdata(dev);
> + unsigned long flags;
> +
> + if (cdns->role == USB_ROLE_HOST)
> + return 0;
> +
> + if (pm_runtime_status_suspended(dev))
> + pm_runtime_resume(dev);
> +
> + if (cdns->roles[cdns->role]->suspend) {
> + spin_lock_irqsave(&cdns->gadget_dev->lock, flags);
Aren't interrupts disabled during system suspend?
What is the purpose of this lock?
> + cdns->roles[cdns->role]->suspend(cdns, false);
> + spin_unlock_irqrestore(&cdns->gadget_dev->lock, flags);
> + }
> +
> + return 0;
> +}
> +
> +static int cdns3_resume(struct device *dev)
> +{
> + struct cdns3 *cdns = dev_get_drvdata(dev);
> + unsigned long flags;
> +> + if (cdns->role == USB_ROLE_HOST)
> + return 0;> +
> + if (cdns->roles[cdns->role]->resume) {
> + spin_lock_irqsave(&cdns->gadget_dev->lock, flags);
> + cdns->roles[cdns->role]->resume(cdns, false);
> + spin_unlock_irqrestore(&cdns->gadget_dev->lock, flags);
> + }
> +
> + pm_runtime_disable(dev);
> + pm_runtime_set_active(dev);
> + pm_runtime_enable(dev);
> +
> + return 0;
> +}
> +#endif
> +
> +static const struct dev_pm_ops cdns3_pm_ops = {
> + SET_SYSTEM_SLEEP_PM_OPS(cdns3_suspend, cdns3_resume)
> +};
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id of_cdns3_match[] = {
> + { .compatible = "cdns,usb3" },
> + { },
> +};
> +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),
> + .pm = &cdns3_pm_ops,
> + },
> +};
> +
> +module_platform_driver(cdns3_driver);
> +
> +MODULE_ALIAS("platform:cdns3");
> +MODULE_AUTHOR("Pawel Laszczak <pawell@...ence.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..581a2f28aca4
> --- /dev/null
> +++ b/drivers/usb/cdns3/core.h
> @@ -0,0 +1,109 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Cadence USBSS DRD Header File.
> + *
> + * Copyright (C) 2017-2018 NXP
> + * Copyright (C) 2018-2019 Cadence.
> + *
> + * Authors: Peter Chen <peter.chen@....com>
> + * Pawel Laszczak <pawell@...ence.com>
> + */
> +#include <linux/usb/otg.h>
> +#include <linux/usb/role.h>
> +
> +#ifndef __LINUX_CDNS3_CORE_H
> +#define __LINUX_CDNS3_CORE_H
> +
> +struct cdns3;
> +
> +/**
> + * 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
> + * @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_res: the resource for otg
> + * @otg_v0_regs: pointer to base of v0 otg registers
> + * @otg_v1_regs: pointer to base of v1 otg registers
> + * @otg_regs: pointer to base of otg registers
> + * @otg_irq: irq number for otg controller
> + * @dev_irq: irq number for device 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
> + * @usb2_phy: pointer to USB2 PHY
> + * @usb3_phy: pointer to USB3 PHY
> + * @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 | USB_DR_MODE_OTG or USB_DR_MODE_HOST or
> + * | USB_DR_MODE_PERIPHERAL
> + * Desired_dr_role can be changed by means of debugfs.
> + * @role_sw: pointer to role switch object.
> + * @root: debugfs root folder pointer
> + */
> +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 otg_irq;
> + int dev_irq;
> + struct cdns3_role_driver *roles[USB_ROLE_DEVICE + 1];
> + enum usb_role role;
> + struct platform_device *host_dev;
> + struct cdns3_device *gadget_dev;
> + struct phy *usb2_phy;
> + struct phy *usb3_phy;
> + /* 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 usb_role_switch *role_sw;
> + struct dentry *root;
> +};
> +
> +#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..4fcd826cf930
> --- /dev/null
> +++ b/drivers/usb/cdns3/debug.h
> @@ -0,0 +1,171 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Cadence USBSS DRD Driver.
> + * Debug header file.
> + *
> + * Copyright (C) 2018-2019 Cadence.
> + *
> + * Author: Pawel Laszczak <pawell@...ence.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_DIS2I || usb_ists & USB_ISTS_DISI)
> + ret += sprintf(str + ret, "Disconnection ");
> + if (usb_ists & USB_ISTS_L2ENTI)
> + ret += sprintf(str + ret, "suspended ");
> + if (usb_ists & USB_ISTS_L1ENTI)
> + ret += sprintf(str + ret, "L1 enter ");
> + if (usb_ists & USB_ISTS_L1EXTI)
> + ret += sprintf(str + ret, "L1 exit ");
> + if (usb_ists & USB_ISTS_L2ENTI)
> + ret += sprintf(str + ret, "L2 enter ");
> + 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@...d %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;
> +}
> +
> +#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);
static inline void ...
> +{ }
> +void cdns3_debugfs_exit(struct cdns3 *cdns);
static inline void ...
> +{ }
> +#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..6a4dcde8dac9
> --- /dev/null
> +++ b/drivers/usb/cdns3/debugfs.c
> @@ -0,0 +1,87 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Cadence USBSS DRD Controller DebugFS filer.
> + *
> + * Copyright (C) 2018-2019 Cadence.
> + *
> + * Author: Pawel Laszczak <pawell@...ence.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;
> +
> + seq_printf(s, "%s\n", usb_dr_mode_to_string(cdns->current_dr_mode));
> + 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;
> + char buf[32];
> + int ret;
> +
> + if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
> + return -EFAULT;
> +
> + buf[count - 1] = '\0';
> +
> + ret = usb_get_dr_mode_from_string(buf);
> + if (ret == USB_DR_MODE_UNKNOWN) {
> + dev_err(cdns->dev, "Failed: incorrect mode setting\n");
> + return -EINVAL;
> + }
> +
> + if (cdns->current_dr_mode != ret) {
> + cdns->desired_dr_mode = ret;
> +
> + if (cdns->role != USB_ROLE_NONE)
> + usb_role_switch_set_role(cdns->role_sw, cdns->role);
> +
> + usb_role_switch_set_role(cdns->role_sw, cdns->role);
> + }
> +
> + return count;
> +}
Why do we still need this debugfs interface?
Doesn't the role switch sysfs do the same thing?
> +
> +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,
> +};
> +
> +void cdns3_debugfs_init(struct cdns3 *cdns)
> +{
> + struct dentry *root;
> +
> + root = debugfs_create_dir(dev_name(cdns->dev), usb_debug_root);
> + 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);
> +}
> +
> +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..77f8a1516140
> --- /dev/null
> +++ b/drivers/usb/cdns3/drd.c
> @@ -0,0 +1,390 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Cadence USBSS DRD Driver.
> + *
> + * Copyright (C) 2018-2019 Cadence.
> + * Copyright (C) 2019 Texas Instruments
> + *
> + * Author: Pawel Laszczak <pawell@...ence.com>
> + * Roger Quadros <rogerq@...com>
> + *
> + *
> + */
> +#include <linux/kernel.h>
> +#include <linux/interrupt.h>
> +#include <linux/delay.h>
> +#include <linux/iopoll.h>
> +#include <linux/usb/otg.h>
> +
> +#include "gadget.h"
> +#include "drd.h"
> +#include "core.h"
> +
> +/**
> + * 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:
> + break;
> + case USB_DR_MODE_HOST:
> + break;
> + case USB_DR_MODE_OTG:
> + dev_dbg(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_get_vbus(struct cdns3 *cdns)
> +{
> + int vbus;
> +
> + vbus = !!(readl(&cdns->otg_regs->sts) & OTGSTS_VBUS_VALID);
> + dev_dbg(cdns->dev, "OTG VBUS: %d", vbus);
> +
> + return vbus;
> +}
> +
> +int cdns3_is_host(struct cdns3 *cdns)
> +{
> + 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)
> +{
> + 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
> + */
> +int cdns3_drd_switch_host(struct cdns3 *cdns, int on)
> +{
> + int ret, val;
> + u32 reg = OTGCMD_OTG_DIS;
> +
> + /* switch OTG core */
> + if (on) {
> + writel(OTGCMD_HOST_BUS_REQ | reg, &cdns->otg_regs->cmd);
> +
> + dev_dbg(cdns->dev, "Waiting till Host mode is turned on\n");
> + ret = readl_poll_timeout_atomic(&cdns->otg_regs->sts, val,
> + val & OTGSTS_XHCI_READY,
> + 1, 100000);
> + if (ret) {
> + dev_err(cdns->dev, "timeout waiting for xhci_ready\n");
> + return ret;
> + }
> + } else {
> + writel(OTGCMD_HOST_BUS_DROP | OTGCMD_DEV_BUS_DROP |
> + OTGCMD_DEV_POWER_OFF | OTGCMD_HOST_POWER_OFF,
> + &cdns->otg_regs->cmd);
> + /* Waiting till H_IDLE state.*/
> + readl_poll_timeout_atomic(&cdns->otg_regs->state, val,
> + !(val & OTGSTATE_HOST_STATE_MASK),
> + 1, 2000000);
> + }
> +
> + return 0;
> +}
> +
> +/**
> + * cdns3_drd_switch_gadget - start/stop gadget
> + * @cdns: Pointer to controller context structure
> + * @on: 1 for start, 0 for stop
> + *
> + * Returns 0 on success otherwise negative errno
> + */
> +int cdns3_drd_switch_gadget(struct cdns3 *cdns, int on)
> +{
> + int ret, val;
> + u32 reg = OTGCMD_OTG_DIS;
> +
> + /* switch OTG core */
> + if (on) {
> + writel(OTGCMD_DEV_BUS_REQ | reg, &cdns->otg_regs->cmd);
> +
> + dev_dbg(cdns->dev, "Waiting till Device mode is turned on\n");
> +
> + ret = readl_poll_timeout_atomic(&cdns->otg_regs->sts, val,
> + val & OTGSTS_DEV_READY,
> + 1, 100000);
> + if (ret) {
> + dev_err(cdns->dev, "timeout waiting for dev_ready\n");
> + return ret;
> + }
> + } else {
> + /*
> + * driver should wait at least 10us after disabling Device
> + * before turning-off Device (DEV_BUS_DROP)
> + */
> + usleep_range(20, 30);
> + writel(OTGCMD_HOST_BUS_DROP | OTGCMD_DEV_BUS_DROP |
> + OTGCMD_DEV_POWER_OFF | OTGCMD_HOST_POWER_OFF,
> + &cdns->otg_regs->cmd);
> + /* Waiting till DEV_IDLE state.*/
> + readl_poll_timeout_atomic(&cdns->otg_regs->state, val,
> + !(val & OTGSTATE_DEV_STATE_MASK),
> + 1, 2000000);
> + }
> +
> + return 0;
> +}
> +
> +/**
> + * cdns3_init_otg_mode - initialize drd controller
> + * @cdns: Pointer to controller context structure
> + *
> + * Returns 0 on success otherwise negative errno
> + */
> +static int cdns3_init_otg_mode(struct cdns3 *cdns)
> +{
> + int ret = 0;
> +
> + cdns3_otg_disable_irq(cdns);
> + /* clear all interrupts */
> + writel(~0, &cdns->otg_regs->ivect);
> +
> + ret = cdns3_set_mode(cdns, USB_DR_MODE_OTG);
> + if (ret)
> + return ret;
> +
> + cdns3_otg_enable_irq(cdns);
> + return ret;
> +}
> +
> +/**
> + * cdns3_drd_update_mode - initialize mode of operation
> + * @cdns: Pointer to controller context structure
> + *
> + * Returns 0 on success otherwise negative errno
> + */
> +int cdns3_drd_update_mode(struct cdns3 *cdns)
> +{
> + int ret = 0;
> +
> + if (cdns->desired_dr_mode == cdns->current_dr_mode)
> + return ret;
> +
> + switch (cdns->desired_dr_mode) {
> + case USB_DR_MODE_PERIPHERAL:
> + ret = cdns3_set_mode(cdns, USB_DR_MODE_PERIPHERAL);
> + break;
> + case USB_DR_MODE_HOST:
> + ret = cdns3_set_mode(cdns, USB_DR_MODE_HOST);
> + break;
> + case USB_DR_MODE_OTG:
> + ret = cdns3_init_otg_mode(cdns);
> + break;
> + default:
> + dev_err(cdns->dev, "Unsupported mode of operation %d\n",
> + cdns->dr_mode);
> + return -EINVAL;
> + }
> +
> + return ret;
> +}
> +
> +static irqreturn_t cdns3_drd_thread_irq(int irq, void *data)
> +{
> + struct cdns3 *cdns = data;
> +
> + usb_role_switch_set_role(cdns->role_sw, cdns->role);
How to ensure that HW events don't step over user chosen role?
> +
> + return IRQ_HANDLED;
> +}
> +
> +/**
> + * cdns3_drd_irq - interrupt handler for OTG events
> + *
> + * @irq: irq number for cdns3 core device
> + * @data: structure of cdns3
> + *
> + * Returns IRQ_HANDLED or IRQ_NONE
> + */
> +static irqreturn_t cdns3_drd_irq(int irq, void *data)
> +{
> + irqreturn_t ret = IRQ_NONE;
> + struct cdns3 *cdns = data;
> + u32 reg;
> +
> + if (cdns->dr_mode != USB_DR_MODE_OTG)
> + return ret;
> +
> + reg = readl(&cdns->otg_regs->ivect);
> +
> + if (!reg)
> + return ret;
> +
> + if (reg & OTGIEN_ID_CHANGE_INT) {
> + dev_dbg(cdns->dev, "OTG IRQ: new ID: %d\n",
> + cdns3_get_id(cdns));
> +
> + ret = IRQ_WAKE_THREAD;
> + }
> +
> + if (reg & (OTGIEN_VBUSVALID_RISE_INT | OTGIEN_VBUSVALID_FALL_INT)) {
> + dev_dbg(cdns->dev, "OTG IRQ: new VBUS: %d\n",
> + cdns3_get_vbus(cdns));
> +
> + ret = IRQ_WAKE_THREAD;
> + }
> +
> + writel(~0, &cdns->otg_regs->ivect);
Do we need to keep the events masked till IRQ thread handler completes?
Else we can get a new hard irq even before previous event is handled by the thread.
> + return ret;
> +}
> +
> +int cdns3_drd_init(struct cdns3 *cdns)
> +{
> + void __iomem *regs;
> + int ret = 0;
> + u32 state;
> +
> + regs = devm_ioremap_resource(cdns->dev, &cdns->otg_res);
> + if (IS_ERR(regs))
> + return PTR_ERR(regs);
> +
> + /* Detection of DRD version. Controller has been released
> + * in two versions. Both are similar, but they have same changes
> + * in register maps.
> + * The first register in old version is command register and it's read
> + * only, so driver should read 0 from it. On the other hand, in v1
> + * the first register contains device ID number which is not set to 0.
> + * Driver uses this fact to detect the proper version of
> + * controller.
> + */
> + cdns->otg_v0_regs = regs;
> + if (!readl(&cdns->otg_v0_regs->cmd)) {
> + cdns->version = CDNS3_CONTROLLER_V0;
> + cdns->otg_v1_regs = NULL;
> + cdns->otg_regs = regs;
> + writel(1, &cdns->otg_v0_regs->simulate);
> + dev_info(cdns->dev, "DRD version v0 (%08x)\n",
> + readl(&cdns->otg_v0_regs->version));
> + } else {
> + cdns->otg_v0_regs = NULL;
> + cdns->otg_v1_regs = regs;
> + cdns->otg_regs = (void *)&cdns->otg_v1_regs->cmd;
> + cdns->version = CDNS3_CONTROLLER_V1;
> + writel(1, &cdns->otg_v1_regs->simulate);
> + dev_info(cdns->dev, "DRD version v1 (ID: %08x, rev: %08x)\n",
> + readl(&cdns->otg_v1_regs->did),
> + readl(&cdns->otg_v1_regs->rid));
> + }
> +
> + state = OTGSTS_STRAP(readl(&cdns->otg_regs->sts));
> +
> + /* Update dr_mode according to STRAP configuration. */
> + cdns->dr_mode = USB_DR_MODE_OTG;
> + if (state == OTGSTS_STRAP_HOST) {
> + dev_dbg(cdns->dev, "Controller strapped to HOST\n");
> + cdns->dr_mode = USB_DR_MODE_HOST;
> + } else if (state == OTGSTS_STRAP_GADGET) {
> + dev_dbg(cdns->dev, "Controller strapped to PERIPHERAL\n");
> + cdns->dr_mode = USB_DR_MODE_PERIPHERAL;
> + }
> +
> + cdns->desired_dr_mode = cdns->dr_mode;
> + cdns->current_dr_mode = USB_DR_MODE_UNKNOWN;
> +
> + ret = devm_request_threaded_irq(cdns->dev, cdns->otg_irq,
> + cdns3_drd_irq,
> + cdns3_drd_thread_irq,
> + IRQF_SHARED,
> + dev_name(cdns->dev), cdns);
> +
> + if (ret) {
> + dev_err(cdns->dev, "couldn't get otg_irq\n");
> + return ret;
> + }
> +
> + state = readl(&cdns->otg_regs->sts);
> + if (OTGSTS_OTG_NRDY(state) != 0) {
> + dev_err(cdns->dev, "Cadence USB3 OTG device not ready\n");
> + return -ENODEV;
> + }
> +
> + return ret;
> +}
> +
> +int cdns3_drd_exit(struct cdns3 *cdns)
> +{
> + cdns3_otg_disable_irq(cdns);
> + return 0;
> +}
> diff --git a/drivers/usb/cdns3/drd.h b/drivers/usb/cdns3/drd.h
> new file mode 100644
> index 000000000000..bf6c7bc41b58
> --- /dev/null
> +++ b/drivers/usb/cdns3/drd.h
> @@ -0,0 +1,166 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Cadence USB3 DRD header file.
> + *
> + * Copyright (C) 2018-2019 Cadence.
> + *
> + * Author: Pawel Laszczak <pawell@...ence.com>
> + */
> +#ifndef __LINUX_CDNS3_DRD
> +#define __LINUX_CDNS3_DRD
> +
> +#include <linux/usb/otg.h>
> +#include <linux/phy/phy.h>
> +#include "core.h"
> +
> +/* DRD register interface for version v1. */
> +struct cdns3_otg_regs {
> + __le32 did;
> + __le32 rid;
> + __le32 capabilities;
> + __le32 reserved1;
> + __le32 cmd;
> + __le32 sts;
> + __le32 state;
> + __le32 reserved2;
> + __le32 ien;
> + __le32 ivect;
> + __le32 refclk;
> + __le32 tmr;
> + __le32 reserved3[4];
> + __le32 simulate;
> + __le32 override;
> + __le32 susp_ctrl;
> + __le32 reserved4;
> + __le32 anasts;
> + __le32 adp_ramp_time;
> + __le32 ctrl1;
> + __le32 ctrl2;
> +};
> +
> +/* DRD register interface for version v0. */
> +struct cdns3_otg_legacy_regs {
> + __le32 cmd;
> + __le32 sts;
> + __le32 state;
> + __le32 refclk;
> + __le32 ien;
> + __le32 ivect;
> + __le32 reserved1[3];
> + __le32 tmr;
> + __le32 reserved2[2];
> + __le32 version;
> + __le32 capabilities;
> + __le32 reserved3[2];
> + __le32 simulate;
> + __le32 reserved4[5];
> + __le32 ctrl1;
> +};
> +
> +/*
> + * Common registers interface for both version of DRD.
> + */
> +struct cdns3_otg_common_regs {
> + __le32 cmd;
> + __le32 sts;
> + __le32 state;
> + __le32 different1;
> + __le32 ien;
> + __le32 ivect;
> +};
> +
> +/* CDNS_RID - bitmasks */
> +#define CDNS_RID(p) ((p) & GENMASK(15, 0))
> +
> +/* CDNS_VID - bitmasks */
> +#define CDNS_DID(p) ((p) & GENMASK(31, 0))
> +
> +/* OTGCMD - bitmasks */
> +/* "Request the bus for Device mode. */
> +#define OTGCMD_DEV_BUS_REQ BIT(0)
> +/* Request the bus for Host mode */
> +#define OTGCMD_HOST_BUS_REQ BIT(1)
> +/* Enable OTG mode. */
> +#define OTGCMD_OTG_EN BIT(2)
> +/* Disable OTG mode */
> +#define OTGCMD_OTG_DIS BIT(3)
> +/*"Configure OTG as A-Device. */
> +#define OTGCMD_A_DEV_EN BIT(4)
> +/*"Configure OTG as A-Device. */
> +#define OTGCMD_A_DEV_DIS BIT(5)
> +/* Drop the bus for Device mod e. */
> +#define OTGCMD_DEV_BUS_DROP BIT(8)
> +/* Drop the bus for Host mode*/
> +#define OTGCMD_HOST_BUS_DROP BIT(9)
> +/* Power Down USBSS-DEV. */
> +#define OTGCMD_DEV_POWER_OFF BIT(11)
> +/* Power Down CDNSXHCI. */
> +#define OTGCMD_HOST_POWER_OFF BIT(12)
> +
> +/* OTGIEN - bitmasks */
> +/* ID change interrupt enable */
> +#define OTGIEN_ID_CHANGE_INT BIT(0)
> +/* Vbusvalid fall detected interrupt enable.*/
> +#define OTGIEN_VBUSVALID_RISE_INT BIT(4)
> +/* Vbusvalid fall detected interrupt enable */
> +#define OTGIEN_VBUSVALID_FALL_INT BIT(5)
> +
> +/* OTGSTS - bitmasks */
> +/*
> + * Current value of the ID pin. It is only valid when idpullup in
> + * OTGCTRL1_TYPE register is set to '1'.
> + */
> +#define OTGSTS_ID_VALUE BIT(0)
> +/* Current value of the vbus_valid */
> +#define OTGSTS_VBUS_VALID BIT(1)
> +/* Current value of the b_sess_vld */
> +#define OTGSTS_SESSION_VALID BIT(2)
> +/*Device mode is active*/
> +#define OTGSTS_DEV_ACTIVE BIT(3)
> +/* Host mode is active. */
> +#define OTGSTS_HOST_ACTIVE BIT(4)
> +/* OTG Controller not ready. */
> +#define OTGSTS_OTG_NRDY_MASK BIT(11)
> +#define OTGSTS_OTG_NRDY(p) ((p) & OTGSTS_OTG_NRDY_MASK)
> +/*
> + * Value of the strap pins.
> + * 000 - no default configuration
> + * 010 - Controller initiall configured as Host
> + * 100 - Controller initially configured as Device
> + */
> +#define OTGSTS_STRAP(p) (((p) & GENMASK(14, 12)) >> 12)
> +#define OTGSTS_STRAP_NO_DEFAULT_CFG 0x00
> +#define OTGSTS_STRAP_HOST_OTG 0x01
> +#define OTGSTS_STRAP_HOST 0x02
> +#define OTGSTS_STRAP_GADGET 0x04
> +/* Host mode is turned on. */
> +#define OTGSTS_XHCI_READY BIT(26)
> +/* "Device mode is turned on .*/
> +#define OTGSTS_DEV_READY BIT(27)
> +
> +/* OTGSTATE- bitmasks */
> +#define OTGSTATE_DEV_STATE_MASK GENMASK(2, 0)
> +#define OTGSTATE_HOST_STATE_MASK GENMASK(5, 3)
> +#define OTGSTATE_HOST_STATE_IDLE 0x0
> +#define OTGSTATE_HOST_STATE_VBUS_FALL 0x7
> +#define OTGSTATE_HOST_STATE(p) (((p) & OTGSTATE_HOST_STATE_MASK) >> 3)
> +
> +/* OTGREFCLK - bitmasks */
> +#define OTGREFCLK_STB_CLK_SWITCH_EN BIT(31)
> +
> +/* OVERRIDE - bitmasks */
> +#define OVERRIDE_IDPULLUP BIT(0)
> +/* Only for CDNS3_CONTROLLER_V0 version */
> +#define OVERRIDE_IDPULLUP_V0 BIT(24)
> +
> +int cdns3_is_host(struct cdns3 *cdns);
> +int cdns3_is_device(struct cdns3 *cdns);
> +int cdns3_get_id(struct cdns3 *cdns);
> +int cdns3_get_vbus(struct cdns3 *cdns);
> +int cdns3_drd_init(struct cdns3 *cdns);
> +int cdns3_drd_exit(struct cdns3 *cdns);
> +int cdns3_drd_update_mode(struct cdns3 *cdns);
> +int cdns3_drd_switch_gadget(struct cdns3 *cdns, int on);
> +int cdns3_drd_switch_host(struct cdns3 *cdns, int on);
> +
> +#endif /* __LINUX_CDNS3_DRD */
<snip>
> diff --git a/drivers/usb/cdns3/gadget.c b/drivers/usb/cdns3/gadget.c
> new file mode 100644
> index 000000000000..291f08be56fe
> --- /dev/null
> +++ b/drivers/usb/cdns3/gadget.c
> @@ -0,0 +1,2338 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Cadence USBSS DRD Driver - gadget side.
> + *
> + * Copyright (C) 2018-2019 Cadence Design Systems.
> + * Copyright (C) 2017-2018 NXP
> + *
> + * Authors: Pawel Jez <pjez@...ence.com>,
> + * Pawel Laszczak <pawell@...ence.com>
> + * Peter Chen <peter.chen@....com>
> + */
> +
<snip>
> +/**
> + * cdns3_device_irq_handler- interrupt handler for device part of controller
> + *
> + * @irq: irq number for cdns3 core device
> + * @data: structure of cdns3
> + *
> + * Returns IRQ_HANDLED or IRQ_NONE
> + */
> +static irqreturn_t cdns3_device_irq_handler(int irq, void *data)
> +{
> + struct cdns3_device *priv_dev;
> + struct cdns3 *cdns = data;
> + irqreturn_t ret = IRQ_NONE;
> + unsigned long flags;
> + u32 reg;
> +
> + priv_dev = cdns->gadget_dev;
> + spin_lock_irqsave(&priv_dev->lock, flags);
> +
> + /* check USB device interrupt */
> + reg = readl(&priv_dev->regs->usb_ists);
> +
> + if (reg) {
> + writel(reg, &priv_dev->regs->usb_ists);
Do we need to mask device interrupts till thread handler has done processing
current set of events?
> + cdns3_check_usb_interrupt_proceed(priv_dev, reg);
> + ret = IRQ_HANDLED;
> + }
> +
> + /* check endpoint interrupt */
> + reg = readl(&priv_dev->regs->ep_ists);
> +
> + if (reg) {
> + priv_dev->shadow_ep_en |= reg;
> + reg = ~reg & readl(&priv_dev->regs->ep_ien);
> + /* mask deferred interrupt. */
> + writel(reg, &priv_dev->regs->ep_ien);
> + ret = IRQ_WAKE_THREAD;
> + }
> +
> + spin_unlock_irqrestore(&priv_dev->lock, flags);
> + return ret;
> +}
> +
<snip>
> +
> +static int cdns3_gadget_start(struct cdns3 *cdns)
> +{
> + struct cdns3_device *priv_dev;
> + u32 max_speed;
> + int ret;
> +
> + priv_dev = kzalloc(sizeof(*priv_dev), GFP_KERNEL);
> + if (!priv_dev)
> + return -ENOMEM;
> +
> + cdns->gadget_dev = priv_dev;
> + priv_dev->sysdev = cdns->dev;
> + priv_dev->dev = cdns->dev;
> + priv_dev->regs = cdns->dev_regs;
> +
> + device_property_read_u16(priv_dev->dev, "cdns,on-chip-buff-size",
> + &priv_dev->onchip_buffers);
> +
> + if (priv_dev->onchip_buffers <= 0) {
> + u32 reg = readl(&priv_dev->regs->usb_cap2);
> +
> + priv_dev->onchip_buffers = USB_CAP2_ACTUAL_MEM_SIZE(reg);
> + }
> +
> + if (!priv_dev->onchip_buffers)
> + priv_dev->onchip_buffers = 256;
> +
> + max_speed = usb_get_maximum_speed(cdns->dev);
> +
> + /* Check the maximum_speed parameter */
> + switch (max_speed) {
> + case USB_SPEED_FULL:
In this case we need to limit controller max speed to full-speed as system
integrator would expect that. e.g. in DT node, maximum-speed = "full-speed";
I suppose we need to set the force Full-speed bit here?
> + case USB_SPEED_HIGH:
Here we need to restrict device controller max-speed to high-speed.
> + case USB_SPEED_SUPER:
> + break;
> + default:
> + dev_err(cdns->dev, "invalid maximum_speed parameter %d\n",
> + max_speed);
> + /* fall through */
> + case USB_SPEED_UNKNOWN:
> + /* default to superspeed */
> + max_speed = USB_SPEED_SUPER;
> + break;
> + }
> +
> + /* fill gadget fields */
> + priv_dev->gadget.max_speed = max_speed;
> + priv_dev->gadget.speed = USB_SPEED_UNKNOWN;
> + priv_dev->gadget.ops = &cdns3_gadget_ops;
> + priv_dev->gadget.name = "usb-ss-gadget";
> + priv_dev->gadget.sg_supported = 1;
> +
> + spin_lock_init(&priv_dev->lock);
> + INIT_WORK(&priv_dev->pending_status_wq,
> + cdns3_pending_setup_status_handler);
> +
> + /* initialize endpoint container */
> + INIT_LIST_HEAD(&priv_dev->gadget.ep_list);
> + INIT_LIST_HEAD(&priv_dev->aligned_buf_list);
> +
> + ret = cdns3_init_eps(priv_dev);
> + if (ret) {
> + dev_err(priv_dev->dev, "Failed to create endpoints\n");
> + goto err1;
> + }
> +
> + /* allocate memory for setup packet buffer */
> + priv_dev->setup_buf = dma_alloc_coherent(priv_dev->sysdev, 8,
> + &priv_dev->setup_dma, GFP_DMA);
> + if (!priv_dev->setup_buf) {
> + ret = -ENOMEM;
> + goto err2;
> + }
> +
> + priv_dev->dev_ver = readl(&priv_dev->regs->usb_cap6);
> +
> + dev_dbg(priv_dev->dev, "Device Controller version: %08x\n",
> + readl(&priv_dev->regs->usb_cap6));
> + dev_dbg(priv_dev->dev, "USB Capabilities:: %08x\n",
> + readl(&priv_dev->regs->usb_cap1));
> + dev_dbg(priv_dev->dev, "On-Chip memory cnfiguration: %08x\n",
> + readl(&priv_dev->regs->usb_cap2));
> +
> + priv_dev->dev_ver = GET_DEV_BASE_VERSION(priv_dev->dev_ver);
> +
> + priv_dev->zlp_buf = kzalloc(CDNS3_EP_ZLP_BUF_SIZE, GFP_KERNEL);
> + if (!priv_dev->zlp_buf) {
> + ret = -ENOMEM;
> + goto err3;
> + }
> +
> + /* add USB gadget device */
> + ret = usb_add_gadget_udc(priv_dev->dev, &priv_dev->gadget);
> + if (ret < 0) {
> + dev_err(priv_dev->dev,
> + "Failed to register USB device controller\n");
> + goto err4;
> + }
> +
> + return 0;
> +err4:
> + kfree(priv_dev->zlp_buf);
> +err3:
> + dma_free_coherent(priv_dev->sysdev, 8, priv_dev->setup_buf,
> + priv_dev->setup_dma);
> +err2:
> + cdns3_free_all_eps(priv_dev);
> +err1:
> + cdns->gadget_dev = NULL;
> + return ret;
> +}
> +
<snip>
cheers,
-roger
--
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