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https://github.com/brain-hackers/u-boot-brain
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![Simon Glass](/assets/img/avatar_default.png)
Move this uncommon header out of the common header. Signed-off-by: Simon Glass <sjg@chromium.org>
500 lines
11 KiB
C
500 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Cadence USBSS DRD Driver.
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*
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* Copyright (C) 2018-2019 Cadence.
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* Copyright (C) 2017-2018 NXP
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* Copyright (C) 2019 Texas Instruments
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*
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* Author: Peter Chen <peter.chen@nxp.com>
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* Pawel Laszczak <pawell@cadence.com>
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* Roger Quadros <rogerq@ti.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <log.h>
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#include <dm/device-internal.h>
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#include <dm/device_compat.h>
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#include <dm/devres.h>
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#include <dm/lists.h>
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#include <linux/bug.h>
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#include <linux/kernel.h>
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#include <linux/io.h>
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#include <usb.h>
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#include <usb/xhci.h>
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#include "core.h"
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#include "host-export.h"
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#include "gadget-export.h"
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#include "drd.h"
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static int cdns3_idle_init(struct cdns3 *cdns);
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struct cdns3_host_priv {
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struct xhci_ctrl xhci_ctrl;
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struct cdns3 cdns;
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};
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struct cdns3_gadget_priv {
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struct cdns3 cdns;
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};
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static inline
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struct cdns3_role_driver *cdns3_get_current_role_driver(struct cdns3 *cdns)
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{
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WARN_ON(!cdns->roles[cdns->role]);
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return cdns->roles[cdns->role];
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}
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static int cdns3_role_start(struct cdns3 *cdns, enum usb_role role)
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{
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int ret;
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if (WARN_ON(role > USB_ROLE_DEVICE))
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return 0;
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mutex_lock(&cdns->mutex);
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cdns->role = role;
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mutex_unlock(&cdns->mutex);
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if (!cdns->roles[role])
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return -ENXIO;
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if (cdns->roles[role]->state == CDNS3_ROLE_STATE_ACTIVE)
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return 0;
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mutex_lock(&cdns->mutex);
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ret = cdns->roles[role]->start(cdns);
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if (!ret)
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cdns->roles[role]->state = CDNS3_ROLE_STATE_ACTIVE;
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mutex_unlock(&cdns->mutex);
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return ret;
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}
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static void cdns3_role_stop(struct cdns3 *cdns)
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{
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enum usb_role role = cdns->role;
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if (WARN_ON(role > USB_ROLE_DEVICE))
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return;
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if (cdns->roles[role]->state == CDNS3_ROLE_STATE_INACTIVE)
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return;
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mutex_lock(&cdns->mutex);
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cdns->roles[role]->stop(cdns);
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cdns->roles[role]->state = CDNS3_ROLE_STATE_INACTIVE;
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mutex_unlock(&cdns->mutex);
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}
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static void cdns3_exit_roles(struct cdns3 *cdns)
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{
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cdns3_role_stop(cdns);
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cdns3_drd_exit(cdns);
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}
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static enum usb_role cdsn3_hw_role_state_machine(struct cdns3 *cdns);
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/**
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* cdns3_core_init_role - initialize role of operation
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* @cdns: Pointer to cdns3 structure
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*
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* Returns 0 on success otherwise negative errno
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*/
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static int cdns3_core_init_role(struct cdns3 *cdns)
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{
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struct udevice *dev = cdns->dev;
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enum usb_dr_mode best_dr_mode;
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enum usb_dr_mode dr_mode;
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int ret = 0;
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dr_mode = usb_get_dr_mode(dev->node);
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cdns->role = USB_ROLE_NONE;
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/*
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* If driver can't read mode by means of usb_get_dr_mode function then
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* chooses mode according with Kernel configuration. This setting
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* can be restricted later depending on strap pin configuration.
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*/
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if (dr_mode == USB_DR_MODE_UNKNOWN) {
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if (IS_ENABLED(CONFIG_USB_CDNS3_HOST) &&
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IS_ENABLED(CONFIG_USB_CDNS3_GADGET))
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dr_mode = USB_DR_MODE_OTG;
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else if (IS_ENABLED(CONFIG_USB_CDNS3_HOST))
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dr_mode = USB_DR_MODE_HOST;
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else if (IS_ENABLED(CONFIG_USB_CDNS3_GADGET))
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dr_mode = USB_DR_MODE_PERIPHERAL;
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}
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/*
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* At this point cdns->dr_mode contains strap configuration.
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* Driver try update this setting considering kernel configuration
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*/
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best_dr_mode = cdns->dr_mode;
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ret = cdns3_idle_init(cdns);
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if (ret)
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return ret;
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if (dr_mode == USB_DR_MODE_OTG) {
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best_dr_mode = cdns->dr_mode;
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} else if (cdns->dr_mode == USB_DR_MODE_OTG) {
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best_dr_mode = dr_mode;
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} else if (cdns->dr_mode != dr_mode) {
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dev_err(dev, "Incorrect DRD configuration\n");
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return -EINVAL;
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}
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dr_mode = best_dr_mode;
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#if defined(CONFIG_SPL_USB_HOST_SUPPORT) || !defined(CONFIG_SPL_BUILD)
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if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
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ret = cdns3_host_init(cdns);
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if (ret) {
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dev_err(dev, "Host initialization failed with %d\n",
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ret);
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goto err;
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}
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}
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#endif
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#if CONFIG_IS_ENABLED(DM_USB_GADGET)
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if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {
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ret = cdns3_gadget_init(cdns);
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if (ret) {
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dev_err(dev, "Device initialization failed with %d\n",
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ret);
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goto err;
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}
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}
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#endif
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cdns->dr_mode = dr_mode;
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ret = cdns3_drd_update_mode(cdns);
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if (ret)
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goto err;
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if (cdns->dr_mode != USB_DR_MODE_OTG) {
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ret = cdns3_hw_role_switch(cdns);
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if (ret)
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goto err;
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}
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return ret;
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err:
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cdns3_exit_roles(cdns);
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return ret;
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}
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/**
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* cdsn3_hw_role_state_machine - role switch state machine based on hw events
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* @cdns: Pointer to controller structure.
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*
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* Returns next role to be entered based on hw events.
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*/
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static enum usb_role cdsn3_hw_role_state_machine(struct cdns3 *cdns)
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{
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enum usb_role role;
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int id, vbus;
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if (cdns->dr_mode != USB_DR_MODE_OTG)
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goto not_otg;
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id = cdns3_get_id(cdns);
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vbus = cdns3_get_vbus(cdns);
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/*
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* Role change state machine
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* Inputs: ID, VBUS
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* Previous state: cdns->role
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* Next state: role
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*/
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role = cdns->role;
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switch (role) {
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case USB_ROLE_NONE:
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/*
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* Driver treats USB_ROLE_NONE synonymous to IDLE state from
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* controller specification.
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*/
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if (!id)
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role = USB_ROLE_HOST;
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else if (vbus)
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role = USB_ROLE_DEVICE;
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break;
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case USB_ROLE_HOST: /* from HOST, we can only change to NONE */
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if (id)
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role = USB_ROLE_NONE;
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break;
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case USB_ROLE_DEVICE: /* from GADGET, we can only change to NONE*/
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if (!vbus)
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role = USB_ROLE_NONE;
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break;
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}
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dev_dbg(cdns->dev, "role %d -> %d\n", cdns->role, role);
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return role;
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not_otg:
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if (cdns3_is_host(cdns))
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role = USB_ROLE_HOST;
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if (cdns3_is_device(cdns))
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role = USB_ROLE_DEVICE;
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return role;
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}
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static int cdns3_idle_role_start(struct cdns3 *cdns)
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{
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return 0;
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}
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static void cdns3_idle_role_stop(struct cdns3 *cdns)
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{
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/* Program Lane swap and bring PHY out of RESET */
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generic_phy_reset(&cdns->usb3_phy);
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}
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static int cdns3_idle_init(struct cdns3 *cdns)
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{
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struct cdns3_role_driver *rdrv;
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rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);
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if (!rdrv)
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return -ENOMEM;
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rdrv->start = cdns3_idle_role_start;
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rdrv->stop = cdns3_idle_role_stop;
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rdrv->state = CDNS3_ROLE_STATE_INACTIVE;
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rdrv->suspend = NULL;
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rdrv->resume = NULL;
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rdrv->name = "idle";
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cdns->roles[USB_ROLE_NONE] = rdrv;
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return 0;
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}
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/**
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* cdns3_hw_role_switch - switch roles based on HW state
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* @cdns3: controller
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*/
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int cdns3_hw_role_switch(struct cdns3 *cdns)
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{
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enum usb_role real_role, current_role;
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int ret = 0;
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/* Do nothing if role based on syfs. */
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if (cdns->role_override)
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return 0;
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current_role = cdns->role;
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real_role = cdsn3_hw_role_state_machine(cdns);
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/* Do nothing if nothing changed */
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if (current_role == real_role)
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goto exit;
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cdns3_role_stop(cdns);
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dev_dbg(cdns->dev, "Switching role %d -> %d", current_role, real_role);
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ret = cdns3_role_start(cdns, real_role);
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if (ret) {
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/* Back to current role */
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dev_err(cdns->dev, "set %d has failed, back to %d\n",
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real_role, current_role);
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ret = cdns3_role_start(cdns, current_role);
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if (ret)
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dev_err(cdns->dev, "back to %d failed too\n",
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current_role);
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}
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exit:
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return ret;
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}
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static int cdns3_probe(struct cdns3 *cdns)
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{
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struct udevice *dev = cdns->dev;
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int ret;
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cdns->xhci_regs = dev_remap_addr_name(dev, "xhci");
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if (!cdns->xhci_regs)
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return -EINVAL;
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cdns->dev_regs = dev_remap_addr_name(dev, "dev");
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if (!cdns->dev_regs)
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return -EINVAL;
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mutex_init(&cdns->mutex);
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ret = generic_phy_get_by_name(dev, "cdns3,usb2-phy", &cdns->usb2_phy);
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if (ret)
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dev_warn(dev, "Unable to get USB2 phy (ret %d)\n", ret);
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ret = generic_phy_init(&cdns->usb2_phy);
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if (ret)
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return ret;
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ret = generic_phy_get_by_name(dev, "cdns3,usb3-phy", &cdns->usb3_phy);
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if (ret)
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dev_warn(dev, "Unable to get USB3 phy (ret %d)\n", ret);
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ret = generic_phy_init(&cdns->usb3_phy);
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if (ret)
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return ret;
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ret = generic_phy_power_on(&cdns->usb2_phy);
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if (ret)
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return ret;
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ret = generic_phy_power_on(&cdns->usb3_phy);
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if (ret)
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return ret;
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ret = cdns3_drd_init(cdns);
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if (ret)
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return ret;
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ret = cdns3_core_init_role(cdns);
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if (ret)
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return ret;
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dev_dbg(dev, "Cadence USB3 core: probe succeed\n");
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return 0;
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}
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static int cdns3_remove(struct cdns3 *cdns)
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{
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cdns3_exit_roles(cdns);
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generic_phy_power_off(&cdns->usb2_phy);
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generic_phy_power_off(&cdns->usb3_phy);
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generic_phy_exit(&cdns->usb2_phy);
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generic_phy_exit(&cdns->usb3_phy);
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return 0;
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}
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static const struct udevice_id cdns3_ids[] = {
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{ .compatible = "cdns,usb3" },
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{ },
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};
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int cdns3_bind(struct udevice *parent)
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{
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enum usb_dr_mode dr_mode;
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struct udevice *dev;
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const char *driver;
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const char *name;
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ofnode node;
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int ret;
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node = ofnode_by_compatible(parent->node, "cdns,usb3");
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if (!ofnode_valid(node)) {
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ret = -ENODEV;
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goto fail;
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}
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name = ofnode_get_name(node);
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dr_mode = usb_get_dr_mode(node);
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switch (dr_mode) {
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#if defined(CONFIG_SPL_USB_HOST_SUPPORT) || \
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(!defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_HOST))
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case USB_DR_MODE_HOST:
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debug("%s: dr_mode: HOST\n", __func__);
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driver = "cdns-usb3-host";
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break;
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#endif
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#if CONFIG_IS_ENABLED(DM_USB_GADGET)
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case USB_DR_MODE_PERIPHERAL:
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debug("%s: dr_mode: PERIPHERAL\n", __func__);
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driver = "cdns-usb3-peripheral";
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break;
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#endif
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default:
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printf("%s: unsupported dr_mode\n", __func__);
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ret = -ENODEV;
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goto fail;
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};
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ret = device_bind_driver_to_node(parent, driver, name, node, &dev);
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if (ret) {
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printf("%s: not able to bind usb device mode\n",
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__func__);
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goto fail;
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}
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return 0;
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fail:
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/* do not return an error: failing to bind would hang the board */
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return 0;
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}
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#if CONFIG_IS_ENABLED(DM_USB_GADGET)
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static int cdns3_gadget_probe(struct udevice *dev)
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{
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struct cdns3_gadget_priv *priv = dev_get_priv(dev);
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struct cdns3 *cdns = &priv->cdns;
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cdns->dev = dev;
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return cdns3_probe(cdns);
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}
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static int cdns3_gadget_remove(struct udevice *dev)
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{
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struct cdns3_gadget_priv *priv = dev_get_priv(dev);
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struct cdns3 *cdns = &priv->cdns;
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return cdns3_remove(cdns);
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}
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U_BOOT_DRIVER(cdns_usb3_peripheral) = {
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.name = "cdns-usb3-peripheral",
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.id = UCLASS_USB_GADGET_GENERIC,
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.of_match = cdns3_ids,
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.probe = cdns3_gadget_probe,
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.remove = cdns3_gadget_remove,
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.priv_auto_alloc_size = sizeof(struct cdns3_gadget_priv),
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.flags = DM_FLAG_ALLOC_PRIV_DMA,
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};
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#endif
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#if defined(CONFIG_SPL_USB_HOST_SUPPORT) || \
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(!defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_HOST))
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static int cdns3_host_probe(struct udevice *dev)
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{
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struct cdns3_host_priv *priv = dev_get_priv(dev);
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struct cdns3 *cdns = &priv->cdns;
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cdns->dev = dev;
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return cdns3_probe(cdns);
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}
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static int cdns3_host_remove(struct udevice *dev)
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{
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struct cdns3_host_priv *priv = dev_get_priv(dev);
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struct cdns3 *cdns = &priv->cdns;
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return cdns3_remove(cdns);
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}
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U_BOOT_DRIVER(cdns_usb3_host) = {
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.name = "cdns-usb3-host",
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.id = UCLASS_USB,
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.of_match = cdns3_ids,
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.probe = cdns3_host_probe,
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.remove = cdns3_host_remove,
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.priv_auto_alloc_size = sizeof(struct cdns3_host_priv),
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.ops = &xhci_usb_ops,
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.flags = DM_FLAG_ALLOC_PRIV_DMA,
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};
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#endif
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