472 lines
10 KiB
C
472 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Cadence CDNSP DRD Driver.
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*
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* Copyright (C) 2020 Cadence.
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*
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* Author: Pawel Laszczak <pawell@cadence.com>
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*
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*/
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#include <linux/usb/composite.h>
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#include <linux/usb/gadget.h>
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#include <linux/list.h>
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#include "cdnsp-gadget.h"
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#include "cdnsp-trace.h"
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static void cdnsp_ep0_stall(struct cdnsp_device *pdev)
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{
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struct cdnsp_request *preq;
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struct cdnsp_ep *pep;
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pep = &pdev->eps[0];
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preq = next_request(&pep->pending_list);
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if (pdev->three_stage_setup) {
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cdnsp_halt_endpoint(pdev, pep, true);
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if (preq)
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cdnsp_gadget_giveback(pep, preq, -ECONNRESET);
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} else {
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pep->ep_state |= EP0_HALTED_STATUS;
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if (preq)
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list_del(&preq->list);
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cdnsp_status_stage(pdev);
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}
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}
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static int cdnsp_ep0_delegate_req(struct cdnsp_device *pdev,
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struct usb_ctrlrequest *ctrl)
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{
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int ret;
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spin_unlock(&pdev->lock);
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ret = pdev->gadget_driver->setup(&pdev->gadget, ctrl);
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spin_lock(&pdev->lock);
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return ret;
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}
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static int cdnsp_ep0_set_config(struct cdnsp_device *pdev,
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struct usb_ctrlrequest *ctrl)
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{
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enum usb_device_state state = pdev->gadget.state;
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u32 cfg;
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int ret;
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cfg = le16_to_cpu(ctrl->wValue);
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switch (state) {
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case USB_STATE_ADDRESS:
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trace_cdnsp_ep0_set_config("from Address state");
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break;
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case USB_STATE_CONFIGURED:
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trace_cdnsp_ep0_set_config("from Configured state");
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break;
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default:
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dev_err(pdev->dev, "Set Configuration - bad device state\n");
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return -EINVAL;
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}
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ret = cdnsp_ep0_delegate_req(pdev, ctrl);
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if (ret)
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return ret;
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if (!cfg)
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usb_gadget_set_state(&pdev->gadget, USB_STATE_ADDRESS);
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return 0;
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}
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static int cdnsp_ep0_set_address(struct cdnsp_device *pdev,
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struct usb_ctrlrequest *ctrl)
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{
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enum usb_device_state state = pdev->gadget.state;
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struct cdnsp_slot_ctx *slot_ctx;
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unsigned int slot_state;
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int ret;
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u32 addr;
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addr = le16_to_cpu(ctrl->wValue);
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if (addr > 127) {
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dev_err(pdev->dev, "Invalid device address %d\n", addr);
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return -EINVAL;
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}
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slot_ctx = cdnsp_get_slot_ctx(&pdev->out_ctx);
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if (state == USB_STATE_CONFIGURED) {
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dev_err(pdev->dev, "Can't Set Address from Configured State\n");
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return -EINVAL;
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}
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pdev->device_address = le16_to_cpu(ctrl->wValue);
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slot_ctx = cdnsp_get_slot_ctx(&pdev->out_ctx);
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slot_state = GET_SLOT_STATE(le32_to_cpu(slot_ctx->dev_state));
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if (slot_state == SLOT_STATE_ADDRESSED)
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cdnsp_reset_device(pdev);
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/*set device address*/
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ret = cdnsp_setup_device(pdev, SETUP_CONTEXT_ADDRESS);
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if (ret)
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return ret;
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if (addr)
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usb_gadget_set_state(&pdev->gadget, USB_STATE_ADDRESS);
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else
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usb_gadget_set_state(&pdev->gadget, USB_STATE_DEFAULT);
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return 0;
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}
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int cdnsp_status_stage(struct cdnsp_device *pdev)
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{
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pdev->ep0_stage = CDNSP_STATUS_STAGE;
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pdev->ep0_preq.request.length = 0;
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return cdnsp_ep_enqueue(pdev->ep0_preq.pep, &pdev->ep0_preq);
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}
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static int cdnsp_w_index_to_ep_index(u16 wIndex)
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{
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if (!(wIndex & USB_ENDPOINT_NUMBER_MASK))
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return 0;
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return ((wIndex & USB_ENDPOINT_NUMBER_MASK) * 2) +
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(wIndex & USB_ENDPOINT_DIR_MASK ? 1 : 0) - 1;
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}
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static int cdnsp_ep0_handle_status(struct cdnsp_device *pdev,
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struct usb_ctrlrequest *ctrl)
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{
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struct cdnsp_ep *pep;
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__le16 *response;
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int ep_sts = 0;
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u16 status = 0;
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u32 recipient;
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recipient = ctrl->bRequestType & USB_RECIP_MASK;
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switch (recipient) {
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case USB_RECIP_DEVICE:
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status = pdev->gadget.is_selfpowered;
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status |= pdev->may_wakeup << USB_DEVICE_REMOTE_WAKEUP;
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if (pdev->gadget.speed >= USB_SPEED_SUPER) {
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status |= pdev->u1_allowed << USB_DEV_STAT_U1_ENABLED;
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status |= pdev->u2_allowed << USB_DEV_STAT_U2_ENABLED;
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}
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break;
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case USB_RECIP_INTERFACE:
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/*
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* Function Remote Wake Capable D0
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* Function Remote Wakeup D1
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*/
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return cdnsp_ep0_delegate_req(pdev, ctrl);
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case USB_RECIP_ENDPOINT:
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ep_sts = cdnsp_w_index_to_ep_index(le16_to_cpu(ctrl->wIndex));
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pep = &pdev->eps[ep_sts];
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ep_sts = GET_EP_CTX_STATE(pep->out_ctx);
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/* check if endpoint is stalled */
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if (ep_sts == EP_STATE_HALTED)
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status = BIT(USB_ENDPOINT_HALT);
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break;
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default:
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return -EINVAL;
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}
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response = (__le16 *)pdev->setup_buf;
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*response = cpu_to_le16(status);
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pdev->ep0_preq.request.length = sizeof(*response);
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pdev->ep0_preq.request.buf = pdev->setup_buf;
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return cdnsp_ep_enqueue(pdev->ep0_preq.pep, &pdev->ep0_preq);
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}
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static void cdnsp_enter_test_mode(struct cdnsp_device *pdev)
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{
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u32 temp;
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temp = readl(&pdev->active_port->regs->portpmsc) & ~GENMASK(31, 28);
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temp |= PORT_TEST_MODE(pdev->test_mode);
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writel(temp, &pdev->active_port->regs->portpmsc);
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}
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static int cdnsp_ep0_handle_feature_device(struct cdnsp_device *pdev,
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struct usb_ctrlrequest *ctrl,
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int set)
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{
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enum usb_device_state state;
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enum usb_device_speed speed;
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u16 tmode;
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state = pdev->gadget.state;
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speed = pdev->gadget.speed;
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switch (le16_to_cpu(ctrl->wValue)) {
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case USB_DEVICE_REMOTE_WAKEUP:
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pdev->may_wakeup = !!set;
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trace_cdnsp_may_wakeup(set);
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break;
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case USB_DEVICE_U1_ENABLE:
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if (state != USB_STATE_CONFIGURED || speed < USB_SPEED_SUPER)
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return -EINVAL;
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pdev->u1_allowed = !!set;
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trace_cdnsp_u1(set);
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break;
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case USB_DEVICE_U2_ENABLE:
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if (state != USB_STATE_CONFIGURED || speed < USB_SPEED_SUPER)
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return -EINVAL;
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pdev->u2_allowed = !!set;
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trace_cdnsp_u2(set);
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break;
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case USB_DEVICE_LTM_ENABLE:
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return -EINVAL;
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case USB_DEVICE_TEST_MODE:
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if (state != USB_STATE_CONFIGURED || speed > USB_SPEED_HIGH)
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return -EINVAL;
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tmode = le16_to_cpu(ctrl->wIndex);
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if (!set || (tmode & 0xff) != 0)
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return -EINVAL;
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tmode = tmode >> 8;
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if (tmode > USB_TEST_FORCE_ENABLE || tmode < USB_TEST_J)
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return -EINVAL;
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pdev->test_mode = tmode;
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/*
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* Test mode must be set before Status Stage but controller
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* will start testing sequence after Status Stage.
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*/
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cdnsp_enter_test_mode(pdev);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int cdnsp_ep0_handle_feature_intf(struct cdnsp_device *pdev,
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struct usb_ctrlrequest *ctrl,
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int set)
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{
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u16 wValue, wIndex;
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int ret;
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wValue = le16_to_cpu(ctrl->wValue);
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wIndex = le16_to_cpu(ctrl->wIndex);
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switch (wValue) {
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case USB_INTRF_FUNC_SUSPEND:
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ret = cdnsp_ep0_delegate_req(pdev, ctrl);
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if (ret)
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return ret;
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/*
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* Remote wakeup is enabled when any function within a device
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* is enabled for function remote wakeup.
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*/
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if (wIndex & USB_INTRF_FUNC_SUSPEND_RW)
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pdev->may_wakeup++;
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else
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if (pdev->may_wakeup > 0)
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pdev->may_wakeup--;
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return 0;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int cdnsp_ep0_handle_feature_endpoint(struct cdnsp_device *pdev,
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struct usb_ctrlrequest *ctrl,
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int set)
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{
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struct cdnsp_ep *pep;
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u16 wValue;
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wValue = le16_to_cpu(ctrl->wValue);
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pep = &pdev->eps[cdnsp_w_index_to_ep_index(le16_to_cpu(ctrl->wIndex))];
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switch (wValue) {
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case USB_ENDPOINT_HALT:
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if (!set && (pep->ep_state & EP_WEDGE)) {
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/* Resets Sequence Number */
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cdnsp_halt_endpoint(pdev, pep, 0);
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cdnsp_halt_endpoint(pdev, pep, 1);
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break;
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}
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return cdnsp_halt_endpoint(pdev, pep, set);
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default:
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dev_warn(pdev->dev, "WARN Incorrect wValue %04x\n", wValue);
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return -EINVAL;
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}
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return 0;
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}
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static int cdnsp_ep0_handle_feature(struct cdnsp_device *pdev,
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struct usb_ctrlrequest *ctrl,
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int set)
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{
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switch (ctrl->bRequestType & USB_RECIP_MASK) {
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case USB_RECIP_DEVICE:
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return cdnsp_ep0_handle_feature_device(pdev, ctrl, set);
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case USB_RECIP_INTERFACE:
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return cdnsp_ep0_handle_feature_intf(pdev, ctrl, set);
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case USB_RECIP_ENDPOINT:
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return cdnsp_ep0_handle_feature_endpoint(pdev, ctrl, set);
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default:
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return -EINVAL;
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}
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}
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static int cdnsp_ep0_set_sel(struct cdnsp_device *pdev,
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struct usb_ctrlrequest *ctrl)
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{
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enum usb_device_state state = pdev->gadget.state;
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u16 wLength;
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if (state == USB_STATE_DEFAULT)
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return -EINVAL;
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wLength = le16_to_cpu(ctrl->wLength);
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if (wLength != 6) {
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dev_err(pdev->dev, "Set SEL should be 6 bytes, got %d\n",
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wLength);
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return -EINVAL;
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}
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/*
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* To handle Set SEL we need to receive 6 bytes from Host. So let's
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* queue a usb_request for 6 bytes.
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*/
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pdev->ep0_preq.request.length = 6;
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pdev->ep0_preq.request.buf = pdev->setup_buf;
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return cdnsp_ep_enqueue(pdev->ep0_preq.pep, &pdev->ep0_preq);
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}
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static int cdnsp_ep0_set_isoch_delay(struct cdnsp_device *pdev,
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struct usb_ctrlrequest *ctrl)
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{
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if (le16_to_cpu(ctrl->wIndex) || le16_to_cpu(ctrl->wLength))
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return -EINVAL;
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pdev->gadget.isoch_delay = le16_to_cpu(ctrl->wValue);
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return 0;
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}
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static int cdnsp_ep0_std_request(struct cdnsp_device *pdev,
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struct usb_ctrlrequest *ctrl)
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{
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int ret;
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switch (ctrl->bRequest) {
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case USB_REQ_GET_STATUS:
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ret = cdnsp_ep0_handle_status(pdev, ctrl);
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break;
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case USB_REQ_CLEAR_FEATURE:
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ret = cdnsp_ep0_handle_feature(pdev, ctrl, 0);
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break;
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case USB_REQ_SET_FEATURE:
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ret = cdnsp_ep0_handle_feature(pdev, ctrl, 1);
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break;
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case USB_REQ_SET_ADDRESS:
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ret = cdnsp_ep0_set_address(pdev, ctrl);
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break;
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case USB_REQ_SET_CONFIGURATION:
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ret = cdnsp_ep0_set_config(pdev, ctrl);
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break;
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case USB_REQ_SET_SEL:
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ret = cdnsp_ep0_set_sel(pdev, ctrl);
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break;
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case USB_REQ_SET_ISOCH_DELAY:
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ret = cdnsp_ep0_set_isoch_delay(pdev, ctrl);
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break;
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default:
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ret = cdnsp_ep0_delegate_req(pdev, ctrl);
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break;
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}
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return ret;
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}
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void cdnsp_setup_analyze(struct cdnsp_device *pdev)
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{
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struct usb_ctrlrequest *ctrl = &pdev->setup;
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int ret = -EINVAL;
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u16 len;
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trace_cdnsp_ctrl_req(ctrl);
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if (!pdev->gadget_driver)
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goto out;
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if (pdev->gadget.state == USB_STATE_NOTATTACHED) {
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dev_err(pdev->dev, "ERR: Setup detected in unattached state\n");
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goto out;
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}
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/* Restore the ep0 to Stopped/Running state. */
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if (pdev->eps[0].ep_state & EP_HALTED) {
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trace_cdnsp_ep0_halted("Restore to normal state");
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cdnsp_halt_endpoint(pdev, &pdev->eps[0], 0);
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}
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/*
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* Finishing previous SETUP transfer by removing request from
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* list and informing upper layer
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*/
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if (!list_empty(&pdev->eps[0].pending_list)) {
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struct cdnsp_request *req;
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trace_cdnsp_ep0_request("Remove previous");
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req = next_request(&pdev->eps[0].pending_list);
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cdnsp_ep_dequeue(&pdev->eps[0], req);
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}
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len = le16_to_cpu(ctrl->wLength);
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if (!len) {
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pdev->three_stage_setup = false;
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pdev->ep0_expect_in = false;
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} else {
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pdev->three_stage_setup = true;
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pdev->ep0_expect_in = !!(ctrl->bRequestType & USB_DIR_IN);
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}
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if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
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ret = cdnsp_ep0_std_request(pdev, ctrl);
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else
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ret = cdnsp_ep0_delegate_req(pdev, ctrl);
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if (ret == USB_GADGET_DELAYED_STATUS) {
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trace_cdnsp_ep0_status_stage("delayed");
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return;
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}
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out:
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if (ret < 0)
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cdnsp_ep0_stall(pdev);
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else if (!len && pdev->ep0_stage != CDNSP_STATUS_STAGE)
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cdnsp_status_stage(pdev);
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}
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