| /** |
| * ep0.c - DesignWare USB3 DRD Controller Endpoint 0 Handling |
| * |
| * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com |
| * |
| * Authors: Felipe Balbi <balbi@ti.com>, |
| * Sebastian Andrzej Siewior <bigeasy@linutronix.de> |
| * |
| * This program is free software: you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 of |
| * the License as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/platform_device.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/interrupt.h> |
| #include <linux/io.h> |
| #include <linux/list.h> |
| #include <linux/dma-mapping.h> |
| |
| #include <linux/usb/ch9.h> |
| #include <linux/usb/gadget.h> |
| #include <linux/usb/composite.h> |
| |
| #include "core.h" |
| #include "debug.h" |
| #include "gadget.h" |
| #include "io.h" |
| |
| static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep); |
| static void __dwc3_ep0_do_control_data(struct dwc3 *dwc, |
| struct dwc3_ep *dep, struct dwc3_request *req); |
| |
| static const char *dwc3_ep0_state_string(enum dwc3_ep0_state state) |
| { |
| switch (state) { |
| case EP0_UNCONNECTED: |
| return "Unconnected"; |
| case EP0_SETUP_PHASE: |
| return "Setup Phase"; |
| case EP0_DATA_PHASE: |
| return "Data Phase"; |
| case EP0_STATUS_PHASE: |
| return "Status Phase"; |
| default: |
| return "UNKNOWN"; |
| } |
| } |
| |
| static void dwc3_ep0_prepare_one_trb(struct dwc3 *dwc, u8 epnum, |
| dma_addr_t buf_dma, u32 len, u32 type, bool chain) |
| { |
| struct dwc3_trb *trb; |
| struct dwc3_ep *dep; |
| |
| dep = dwc->eps[epnum]; |
| |
| trb = &dwc->ep0_trb[dep->trb_enqueue]; |
| |
| if (chain) |
| dep->trb_enqueue++; |
| |
| trb->bpl = lower_32_bits(buf_dma); |
| trb->bph = upper_32_bits(buf_dma); |
| trb->size = len; |
| trb->ctrl = type; |
| |
| trb->ctrl |= (DWC3_TRB_CTRL_HWO |
| | DWC3_TRB_CTRL_ISP_IMI); |
| |
| if (chain) |
| trb->ctrl |= DWC3_TRB_CTRL_CHN; |
| else |
| trb->ctrl |= (DWC3_TRB_CTRL_IOC |
| | DWC3_TRB_CTRL_LST); |
| |
| trace_dwc3_prepare_trb(dep, trb); |
| } |
| |
| static int dwc3_ep0_start_trans(struct dwc3 *dwc, u8 epnum) |
| { |
| struct dwc3_gadget_ep_cmd_params params; |
| struct dwc3_ep *dep; |
| int ret; |
| |
| dep = dwc->eps[epnum]; |
| if (dep->flags & DWC3_EP_BUSY) { |
| dwc3_trace(trace_dwc3_ep0, "%s still busy", dep->name); |
| return 0; |
| } |
| |
| memset(¶ms, 0, sizeof(params)); |
| params.param0 = upper_32_bits(dwc->ep0_trb_addr); |
| params.param1 = lower_32_bits(dwc->ep0_trb_addr); |
| |
| ret = dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_STARTTRANSFER, ¶ms); |
| if (ret < 0) { |
| dwc3_trace(trace_dwc3_ep0, "%s STARTTRANSFER failed", |
| dep->name); |
| return ret; |
| } |
| |
| dep->flags |= DWC3_EP_BUSY; |
| dep->resource_index = dwc3_gadget_ep_get_transfer_index(dep); |
| dwc->ep0_next_event = DWC3_EP0_COMPLETE; |
| |
| return 0; |
| } |
| |
| static int __dwc3_gadget_ep0_queue(struct dwc3_ep *dep, |
| struct dwc3_request *req) |
| { |
| struct dwc3 *dwc = dep->dwc; |
| |
| req->request.actual = 0; |
| req->request.status = -EINPROGRESS; |
| req->epnum = dep->number; |
| |
| list_add_tail(&req->list, &dep->pending_list); |
| |
| /* |
| * Gadget driver might not be quick enough to queue a request |
| * before we get a Transfer Not Ready event on this endpoint. |
| * |
| * In that case, we will set DWC3_EP_PENDING_REQUEST. When that |
| * flag is set, it's telling us that as soon as Gadget queues the |
| * required request, we should kick the transfer here because the |
| * IRQ we were waiting for is long gone. |
| */ |
| if (dep->flags & DWC3_EP_PENDING_REQUEST) { |
| unsigned direction; |
| |
| direction = !!(dep->flags & DWC3_EP0_DIR_IN); |
| |
| if (dwc->ep0state != EP0_DATA_PHASE) { |
| dev_WARN(dwc->dev, "Unexpected pending request\n"); |
| return 0; |
| } |
| |
| __dwc3_ep0_do_control_data(dwc, dwc->eps[direction], req); |
| |
| dep->flags &= ~(DWC3_EP_PENDING_REQUEST | |
| DWC3_EP0_DIR_IN); |
| |
| return 0; |
| } |
| |
| /* |
| * In case gadget driver asked us to delay the STATUS phase, |
| * handle it here. |
| */ |
| if (dwc->delayed_status) { |
| unsigned direction; |
| |
| direction = !dwc->ep0_expect_in; |
| dwc->delayed_status = false; |
| usb_gadget_set_state(&dwc->gadget, USB_STATE_CONFIGURED); |
| |
| if (dwc->ep0state == EP0_STATUS_PHASE) |
| __dwc3_ep0_do_control_status(dwc, dwc->eps[direction]); |
| else |
| dwc3_trace(trace_dwc3_ep0, |
| "too early for delayed status"); |
| |
| return 0; |
| } |
| |
| /* |
| * Unfortunately we have uncovered a limitation wrt the Data Phase. |
| * |
| * Section 9.4 says we can wait for the XferNotReady(DATA) event to |
| * come before issueing Start Transfer command, but if we do, we will |
| * miss situations where the host starts another SETUP phase instead of |
| * the DATA phase. Such cases happen at least on TD.7.6 of the Link |
| * Layer Compliance Suite. |
| * |
| * The problem surfaces due to the fact that in case of back-to-back |
| * SETUP packets there will be no XferNotReady(DATA) generated and we |
| * will be stuck waiting for XferNotReady(DATA) forever. |
| * |
| * By looking at tables 9-13 and 9-14 of the Databook, we can see that |
| * it tells us to start Data Phase right away. It also mentions that if |
| * we receive a SETUP phase instead of the DATA phase, core will issue |
| * XferComplete for the DATA phase, before actually initiating it in |
| * the wire, with the TRB's status set to "SETUP_PENDING". Such status |
| * can only be used to print some debugging logs, as the core expects |
| * us to go through to the STATUS phase and start a CONTROL_STATUS TRB, |
| * just so it completes right away, without transferring anything and, |
| * only then, we can go back to the SETUP phase. |
| * |
| * Because of this scenario, SNPS decided to change the programming |
| * model of control transfers and support on-demand transfers only for |
| * the STATUS phase. To fix the issue we have now, we will always wait |
| * for gadget driver to queue the DATA phase's struct usb_request, then |
| * start it right away. |
| * |
| * If we're actually in a 2-stage transfer, we will wait for |
| * XferNotReady(STATUS). |
| */ |
| if (dwc->three_stage_setup) { |
| unsigned direction; |
| |
| direction = dwc->ep0_expect_in; |
| dwc->ep0state = EP0_DATA_PHASE; |
| |
| __dwc3_ep0_do_control_data(dwc, dwc->eps[direction], req); |
| |
| dep->flags &= ~DWC3_EP0_DIR_IN; |
| } |
| |
| return 0; |
| } |
| |
| int dwc3_gadget_ep0_queue(struct usb_ep *ep, struct usb_request *request, |
| gfp_t gfp_flags) |
| { |
| struct dwc3_request *req = to_dwc3_request(request); |
| struct dwc3_ep *dep = to_dwc3_ep(ep); |
| struct dwc3 *dwc = dep->dwc; |
| |
| unsigned long flags; |
| |
| int ret; |
| |
| spin_lock_irqsave(&dwc->lock, flags); |
| if (!dep->endpoint.desc) { |
| dwc3_trace(trace_dwc3_ep0, |
| "trying to queue request %p to disabled %s", |
| request, dep->name); |
| ret = -ESHUTDOWN; |
| goto out; |
| } |
| |
| /* we share one TRB for ep0/1 */ |
| if (!list_empty(&dep->pending_list)) { |
| ret = -EBUSY; |
| goto out; |
| } |
| |
| dwc3_trace(trace_dwc3_ep0, |
| "queueing request %p to %s length %d state '%s'", |
| request, dep->name, request->length, |
| dwc3_ep0_state_string(dwc->ep0state)); |
| |
| ret = __dwc3_gadget_ep0_queue(dep, req); |
| |
| out: |
| spin_unlock_irqrestore(&dwc->lock, flags); |
| |
| return ret; |
| } |
| |
| static void dwc3_ep0_stall_and_restart(struct dwc3 *dwc) |
| { |
| struct dwc3_ep *dep; |
| |
| /* reinitialize physical ep1 */ |
| dep = dwc->eps[1]; |
| dep->flags = DWC3_EP_ENABLED; |
| |
| /* stall is always issued on EP0 */ |
| dep = dwc->eps[0]; |
| __dwc3_gadget_ep_set_halt(dep, 1, false); |
| dep->flags = DWC3_EP_ENABLED; |
| dwc->delayed_status = false; |
| |
| if (!list_empty(&dep->pending_list)) { |
| struct dwc3_request *req; |
| |
| req = next_request(&dep->pending_list); |
| dwc3_gadget_giveback(dep, req, -ECONNRESET); |
| } |
| |
| dwc->ep0state = EP0_SETUP_PHASE; |
| dwc3_ep0_out_start(dwc); |
| } |
| |
| int __dwc3_gadget_ep0_set_halt(struct usb_ep *ep, int value) |
| { |
| struct dwc3_ep *dep = to_dwc3_ep(ep); |
| struct dwc3 *dwc = dep->dwc; |
| |
| dwc3_ep0_stall_and_restart(dwc); |
| |
| return 0; |
| } |
| |
| int dwc3_gadget_ep0_set_halt(struct usb_ep *ep, int value) |
| { |
| struct dwc3_ep *dep = to_dwc3_ep(ep); |
| struct dwc3 *dwc = dep->dwc; |
| unsigned long flags; |
| int ret; |
| |
| spin_lock_irqsave(&dwc->lock, flags); |
| ret = __dwc3_gadget_ep0_set_halt(ep, value); |
| spin_unlock_irqrestore(&dwc->lock, flags); |
| |
| return ret; |
| } |
| |
| void dwc3_ep0_out_start(struct dwc3 *dwc) |
| { |
| int ret; |
| |
| dwc3_ep0_prepare_one_trb(dwc, 0, dwc->ctrl_req_addr, 8, |
| DWC3_TRBCTL_CONTROL_SETUP, false); |
| ret = dwc3_ep0_start_trans(dwc, 0); |
| WARN_ON(ret < 0); |
| } |
| |
| static struct dwc3_ep *dwc3_wIndex_to_dep(struct dwc3 *dwc, __le16 wIndex_le) |
| { |
| struct dwc3_ep *dep; |
| u32 windex = le16_to_cpu(wIndex_le); |
| u32 epnum; |
| |
| epnum = (windex & USB_ENDPOINT_NUMBER_MASK) << 1; |
| if ((windex & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) |
| epnum |= 1; |
| |
| dep = dwc->eps[epnum]; |
| if (dep == NULL) |
| return NULL; |
| |
| if (dep->flags & DWC3_EP_ENABLED) |
| return dep; |
| |
| return NULL; |
| } |
| |
| static void dwc3_ep0_status_cmpl(struct usb_ep *ep, struct usb_request *req) |
| { |
| } |
| /* |
| * ch 9.4.5 |
| */ |
| static int dwc3_ep0_handle_status(struct dwc3 *dwc, |
| struct usb_ctrlrequest *ctrl) |
| { |
| struct dwc3_ep *dep; |
| u32 recip; |
| u32 reg; |
| u16 usb_status = 0; |
| __le16 *response_pkt; |
| |
| recip = ctrl->bRequestType & USB_RECIP_MASK; |
| switch (recip) { |
| case USB_RECIP_DEVICE: |
| /* |
| * LTM will be set once we know how to set this in HW. |
| */ |
| usb_status |= dwc->gadget.is_selfpowered; |
| |
| if ((dwc->speed == DWC3_DSTS_SUPERSPEED) || |
| (dwc->speed == DWC3_DSTS_SUPERSPEED_PLUS)) { |
| reg = dwc3_readl(dwc->regs, DWC3_DCTL); |
| if (reg & DWC3_DCTL_INITU1ENA) |
| usb_status |= 1 << USB_DEV_STAT_U1_ENABLED; |
| if (reg & DWC3_DCTL_INITU2ENA) |
| usb_status |= 1 << USB_DEV_STAT_U2_ENABLED; |
| } |
| |
| break; |
| |
| case USB_RECIP_INTERFACE: |
| /* |
| * Function Remote Wake Capable D0 |
| * Function Remote Wakeup D1 |
| */ |
| break; |
| |
| case USB_RECIP_ENDPOINT: |
| dep = dwc3_wIndex_to_dep(dwc, ctrl->wIndex); |
| if (!dep) |
| return -EINVAL; |
| |
| if (dep->flags & DWC3_EP_STALL) |
| usb_status = 1 << USB_ENDPOINT_HALT; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| response_pkt = (__le16 *) dwc->setup_buf; |
| *response_pkt = cpu_to_le16(usb_status); |
| |
| dep = dwc->eps[0]; |
| dwc->ep0_usb_req.dep = dep; |
| dwc->ep0_usb_req.request.length = sizeof(*response_pkt); |
| dwc->ep0_usb_req.request.buf = dwc->setup_buf; |
| dwc->ep0_usb_req.request.complete = dwc3_ep0_status_cmpl; |
| |
| return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req); |
| } |
| |
| static int dwc3_ep0_handle_feature(struct dwc3 *dwc, |
| struct usb_ctrlrequest *ctrl, int set) |
| { |
| struct dwc3_ep *dep; |
| u32 recip; |
| u32 wValue; |
| u32 wIndex; |
| u32 reg; |
| int ret; |
| enum usb_device_state state; |
| |
| wValue = le16_to_cpu(ctrl->wValue); |
| wIndex = le16_to_cpu(ctrl->wIndex); |
| recip = ctrl->bRequestType & USB_RECIP_MASK; |
| state = dwc->gadget.state; |
| |
| switch (recip) { |
| case USB_RECIP_DEVICE: |
| |
| switch (wValue) { |
| case USB_DEVICE_REMOTE_WAKEUP: |
| break; |
| /* |
| * 9.4.1 says only only for SS, in AddressState only for |
| * default control pipe |
| */ |
| case USB_DEVICE_U1_ENABLE: |
| if (state != USB_STATE_CONFIGURED) |
| return -EINVAL; |
| if ((dwc->speed != DWC3_DSTS_SUPERSPEED) && |
| (dwc->speed != DWC3_DSTS_SUPERSPEED_PLUS)) |
| return -EINVAL; |
| |
| reg = dwc3_readl(dwc->regs, DWC3_DCTL); |
| if (set) |
| reg |= DWC3_DCTL_INITU1ENA; |
| else |
| reg &= ~DWC3_DCTL_INITU1ENA; |
| dwc3_writel(dwc->regs, DWC3_DCTL, reg); |
| break; |
| |
| case USB_DEVICE_U2_ENABLE: |
| if (state != USB_STATE_CONFIGURED) |
| return -EINVAL; |
| if ((dwc->speed != DWC3_DSTS_SUPERSPEED) && |
| (dwc->speed != DWC3_DSTS_SUPERSPEED_PLUS)) |
| return -EINVAL; |
| |
| reg = dwc3_readl(dwc->regs, DWC3_DCTL); |
| if (set) |
| reg |= DWC3_DCTL_INITU2ENA; |
| else |
| reg &= ~DWC3_DCTL_INITU2ENA; |
| dwc3_writel(dwc->regs, DWC3_DCTL, reg); |
| break; |
| |
| case USB_DEVICE_LTM_ENABLE: |
| return -EINVAL; |
| |
| case USB_DEVICE_TEST_MODE: |
| if ((wIndex & 0xff) != 0) |
| return -EINVAL; |
| if (!set) |
| return -EINVAL; |
| |
| switch (wIndex >> 8) { |
| case TEST_J: |
| case TEST_K: |
| case TEST_SE0_NAK: |
| case TEST_PACKET: |
| case TEST_FORCE_EN: |
| dwc->test_mode_nr = wIndex >> 8; |
| dwc->test_mode = true; |
| break; |
| default: |
| return -EINVAL; |
| } |
| break; |
| default: |
| return -EINVAL; |
| } |
| break; |
| |
| case USB_RECIP_INTERFACE: |
| switch (wValue) { |
| case USB_INTRF_FUNC_SUSPEND: |
| if (wIndex & USB_INTRF_FUNC_SUSPEND_LP) |
| /* XXX enable Low power suspend */ |
| ; |
| if (wIndex & USB_INTRF_FUNC_SUSPEND_RW) |
| /* XXX enable remote wakeup */ |
| ; |
| break; |
| default: |
| return -EINVAL; |
| } |
| break; |
| |
| case USB_RECIP_ENDPOINT: |
| switch (wValue) { |
| case USB_ENDPOINT_HALT: |
| dep = dwc3_wIndex_to_dep(dwc, ctrl->wIndex); |
| if (!dep) |
| return -EINVAL; |
| if (set == 0 && (dep->flags & DWC3_EP_WEDGE)) |
| break; |
| ret = __dwc3_gadget_ep_set_halt(dep, set, true); |
| if (ret) |
| return -EINVAL; |
| break; |
| default: |
| return -EINVAL; |
| } |
| break; |
| |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static int dwc3_ep0_set_address(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl) |
| { |
| enum usb_device_state state = dwc->gadget.state; |
| u32 addr; |
| u32 reg; |
| |
| addr = le16_to_cpu(ctrl->wValue); |
| if (addr > 127) { |
| dwc3_trace(trace_dwc3_ep0, "invalid device address %d", addr); |
| return -EINVAL; |
| } |
| |
| if (state == USB_STATE_CONFIGURED) { |
| dwc3_trace(trace_dwc3_ep0, |
| "trying to set address when configured"); |
| return -EINVAL; |
| } |
| |
| reg = dwc3_readl(dwc->regs, DWC3_DCFG); |
| reg &= ~(DWC3_DCFG_DEVADDR_MASK); |
| reg |= DWC3_DCFG_DEVADDR(addr); |
| dwc3_writel(dwc->regs, DWC3_DCFG, reg); |
| |
| if (addr) |
| usb_gadget_set_state(&dwc->gadget, USB_STATE_ADDRESS); |
| else |
| usb_gadget_set_state(&dwc->gadget, USB_STATE_DEFAULT); |
| |
| return 0; |
| } |
| |
| static int dwc3_ep0_delegate_req(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl) |
| { |
| int ret; |
| |
| spin_unlock(&dwc->lock); |
| ret = dwc->gadget_driver->setup(&dwc->gadget, ctrl); |
| spin_lock(&dwc->lock); |
| return ret; |
| } |
| |
| static int dwc3_ep0_set_config(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl) |
| { |
| enum usb_device_state state = dwc->gadget.state; |
| u32 cfg; |
| int ret; |
| u32 reg; |
| |
| cfg = le16_to_cpu(ctrl->wValue); |
| |
| switch (state) { |
| case USB_STATE_DEFAULT: |
| return -EINVAL; |
| |
| case USB_STATE_ADDRESS: |
| ret = dwc3_ep0_delegate_req(dwc, ctrl); |
| /* if the cfg matches and the cfg is non zero */ |
| if (cfg && (!ret || (ret == USB_GADGET_DELAYED_STATUS))) { |
| |
| /* |
| * only change state if set_config has already |
| * been processed. If gadget driver returns |
| * USB_GADGET_DELAYED_STATUS, we will wait |
| * to change the state on the next usb_ep_queue() |
| */ |
| if (ret == 0) |
| usb_gadget_set_state(&dwc->gadget, |
| USB_STATE_CONFIGURED); |
| |
| /* |
| * Enable transition to U1/U2 state when |
| * nothing is pending from application. |
| */ |
| reg = dwc3_readl(dwc->regs, DWC3_DCTL); |
| reg |= (DWC3_DCTL_ACCEPTU1ENA | DWC3_DCTL_ACCEPTU2ENA); |
| dwc3_writel(dwc->regs, DWC3_DCTL, reg); |
| } |
| break; |
| |
| case USB_STATE_CONFIGURED: |
| ret = dwc3_ep0_delegate_req(dwc, ctrl); |
| if (!cfg && !ret) |
| usb_gadget_set_state(&dwc->gadget, |
| USB_STATE_ADDRESS); |
| break; |
| default: |
| ret = -EINVAL; |
| } |
| return ret; |
| } |
| |
| static void dwc3_ep0_set_sel_cmpl(struct usb_ep *ep, struct usb_request *req) |
| { |
| struct dwc3_ep *dep = to_dwc3_ep(ep); |
| struct dwc3 *dwc = dep->dwc; |
| |
| u32 param = 0; |
| u32 reg; |
| |
| struct timing { |
| u8 u1sel; |
| u8 u1pel; |
| __le16 u2sel; |
| __le16 u2pel; |
| } __packed timing; |
| |
| int ret; |
| |
| memcpy(&timing, req->buf, sizeof(timing)); |
| |
| dwc->u1sel = timing.u1sel; |
| dwc->u1pel = timing.u1pel; |
| dwc->u2sel = le16_to_cpu(timing.u2sel); |
| dwc->u2pel = le16_to_cpu(timing.u2pel); |
| |
| reg = dwc3_readl(dwc->regs, DWC3_DCTL); |
| if (reg & DWC3_DCTL_INITU2ENA) |
| param = dwc->u2pel; |
| if (reg & DWC3_DCTL_INITU1ENA) |
| param = dwc->u1pel; |
| |
| /* |
| * According to Synopsys Databook, if parameter is |
| * greater than 125, a value of zero should be |
| * programmed in the register. |
| */ |
| if (param > 125) |
| param = 0; |
| |
| /* now that we have the time, issue DGCMD Set Sel */ |
| ret = dwc3_send_gadget_generic_command(dwc, |
| DWC3_DGCMD_SET_PERIODIC_PAR, param); |
| WARN_ON(ret < 0); |
| } |
| |
| static int dwc3_ep0_set_sel(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl) |
| { |
| struct dwc3_ep *dep; |
| enum usb_device_state state = dwc->gadget.state; |
| u16 wLength; |
| u16 wValue; |
| |
| if (state == USB_STATE_DEFAULT) |
| return -EINVAL; |
| |
| wValue = le16_to_cpu(ctrl->wValue); |
| wLength = le16_to_cpu(ctrl->wLength); |
| |
| if (wLength != 6) { |
| dev_err(dwc->dev, "Set SEL should be 6 bytes, got %d\n", |
| wLength); |
| return -EINVAL; |
| } |
| |
| /* |
| * To handle Set SEL we need to receive 6 bytes from Host. So let's |
| * queue a usb_request for 6 bytes. |
| * |
| * Remember, though, this controller can't handle non-wMaxPacketSize |
| * aligned transfers on the OUT direction, so we queue a request for |
| * wMaxPacketSize instead. |
| */ |
| dep = dwc->eps[0]; |
| dwc->ep0_usb_req.dep = dep; |
| dwc->ep0_usb_req.request.length = dep->endpoint.maxpacket; |
| dwc->ep0_usb_req.request.buf = dwc->setup_buf; |
| dwc->ep0_usb_req.request.complete = dwc3_ep0_set_sel_cmpl; |
| |
| return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req); |
| } |
| |
| static int dwc3_ep0_set_isoch_delay(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl) |
| { |
| u16 wLength; |
| u16 wValue; |
| u16 wIndex; |
| |
| wValue = le16_to_cpu(ctrl->wValue); |
| wLength = le16_to_cpu(ctrl->wLength); |
| wIndex = le16_to_cpu(ctrl->wIndex); |
| |
| if (wIndex || wLength) |
| return -EINVAL; |
| |
| /* |
| * REVISIT It's unclear from Databook what to do with this |
| * value. For now, just cache it. |
| */ |
| dwc->isoch_delay = wValue; |
| |
| return 0; |
| } |
| |
| static int dwc3_ep0_std_request(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl) |
| { |
| int ret; |
| |
| switch (ctrl->bRequest) { |
| case USB_REQ_GET_STATUS: |
| dwc3_trace(trace_dwc3_ep0, "USB_REQ_GET_STATUS"); |
| ret = dwc3_ep0_handle_status(dwc, ctrl); |
| break; |
| case USB_REQ_CLEAR_FEATURE: |
| dwc3_trace(trace_dwc3_ep0, "USB_REQ_CLEAR_FEATURE"); |
| ret = dwc3_ep0_handle_feature(dwc, ctrl, 0); |
| break; |
| case USB_REQ_SET_FEATURE: |
| dwc3_trace(trace_dwc3_ep0, "USB_REQ_SET_FEATURE"); |
| ret = dwc3_ep0_handle_feature(dwc, ctrl, 1); |
| break; |
| case USB_REQ_SET_ADDRESS: |
| dwc3_trace(trace_dwc3_ep0, "USB_REQ_SET_ADDRESS"); |
| ret = dwc3_ep0_set_address(dwc, ctrl); |
| break; |
| case USB_REQ_SET_CONFIGURATION: |
| dwc3_trace(trace_dwc3_ep0, "USB_REQ_SET_CONFIGURATION"); |
| ret = dwc3_ep0_set_config(dwc, ctrl); |
| break; |
| case USB_REQ_SET_SEL: |
| dwc3_trace(trace_dwc3_ep0, "USB_REQ_SET_SEL"); |
| ret = dwc3_ep0_set_sel(dwc, ctrl); |
| break; |
| case USB_REQ_SET_ISOCH_DELAY: |
| dwc3_trace(trace_dwc3_ep0, "USB_REQ_SET_ISOCH_DELAY"); |
| ret = dwc3_ep0_set_isoch_delay(dwc, ctrl); |
| break; |
| default: |
| dwc3_trace(trace_dwc3_ep0, "Forwarding to gadget driver"); |
| ret = dwc3_ep0_delegate_req(dwc, ctrl); |
| break; |
| } |
| |
| return ret; |
| } |
| |
| static void dwc3_ep0_inspect_setup(struct dwc3 *dwc, |
| const struct dwc3_event_depevt *event) |
| { |
| struct usb_ctrlrequest *ctrl = dwc->ctrl_req; |
| int ret = -EINVAL; |
| u32 len; |
| |
| if (!dwc->gadget_driver) |
| goto out; |
| |
| trace_dwc3_ctrl_req(ctrl); |
| |
| len = le16_to_cpu(ctrl->wLength); |
| if (!len) { |
| dwc->three_stage_setup = false; |
| dwc->ep0_expect_in = false; |
| dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS; |
| } else { |
| dwc->three_stage_setup = true; |
| dwc->ep0_expect_in = !!(ctrl->bRequestType & USB_DIR_IN); |
| dwc->ep0_next_event = DWC3_EP0_NRDY_DATA; |
| } |
| |
| if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) |
| ret = dwc3_ep0_std_request(dwc, ctrl); |
| else |
| ret = dwc3_ep0_delegate_req(dwc, ctrl); |
| |
| if (ret == USB_GADGET_DELAYED_STATUS) |
| dwc->delayed_status = true; |
| |
| out: |
| if (ret < 0) |
| dwc3_ep0_stall_and_restart(dwc); |
| } |
| |
| static void dwc3_ep0_complete_data(struct dwc3 *dwc, |
| const struct dwc3_event_depevt *event) |
| { |
| struct dwc3_request *r = NULL; |
| struct usb_request *ur; |
| struct dwc3_trb *trb; |
| struct dwc3_ep *ep0; |
| unsigned transfer_size = 0; |
| unsigned maxp; |
| unsigned remaining_ur_length; |
| void *buf; |
| u32 transferred = 0; |
| u32 status; |
| u32 length; |
| u8 epnum; |
| |
| epnum = event->endpoint_number; |
| ep0 = dwc->eps[0]; |
| |
| dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS; |
| |
| trb = dwc->ep0_trb; |
| |
| trace_dwc3_complete_trb(ep0, trb); |
| |
| r = next_request(&ep0->pending_list); |
| if (!r) |
| return; |
| |
| status = DWC3_TRB_SIZE_TRBSTS(trb->size); |
| if (status == DWC3_TRBSTS_SETUP_PENDING) { |
| dwc->setup_packet_pending = true; |
| |
| dwc3_trace(trace_dwc3_ep0, "Setup Pending received"); |
| |
| if (r) |
| dwc3_gadget_giveback(ep0, r, -ECONNRESET); |
| |
| return; |
| } |
| |
| ur = &r->request; |
| buf = ur->buf; |
| remaining_ur_length = ur->length; |
| |
| length = trb->size & DWC3_TRB_SIZE_MASK; |
| |
| maxp = ep0->endpoint.maxpacket; |
| |
| if (dwc->ep0_bounced) { |
| /* |
| * Handle the first TRB before handling the bounce buffer if |
| * the request length is greater than the bounce buffer size |
| */ |
| if (ur->length > DWC3_EP0_BOUNCE_SIZE) { |
| transfer_size = ALIGN(ur->length - maxp, maxp); |
| transferred = transfer_size - length; |
| buf = (u8 *)buf + transferred; |
| ur->actual += transferred; |
| remaining_ur_length -= transferred; |
| |
| trb++; |
| length = trb->size & DWC3_TRB_SIZE_MASK; |
| |
| ep0->trb_enqueue = 0; |
| } |
| |
| transfer_size = roundup((ur->length - transfer_size), |
| maxp); |
| |
| transferred = min_t(u32, remaining_ur_length, |
| transfer_size - length); |
| memcpy(buf, dwc->ep0_bounce, transferred); |
| } else { |
| transferred = ur->length - length; |
| } |
| |
| ur->actual += transferred; |
| |
| if ((epnum & 1) && ur->actual < ur->length) { |
| /* for some reason we did not get everything out */ |
| |
| dwc3_ep0_stall_and_restart(dwc); |
| } else { |
| dwc3_gadget_giveback(ep0, r, 0); |
| |
| if (IS_ALIGNED(ur->length, ep0->endpoint.maxpacket) && |
| ur->length && ur->zero) { |
| int ret; |
| |
| dwc->ep0_next_event = DWC3_EP0_COMPLETE; |
| |
| dwc3_ep0_prepare_one_trb(dwc, epnum, dwc->ctrl_req_addr, |
| 0, DWC3_TRBCTL_CONTROL_DATA, false); |
| ret = dwc3_ep0_start_trans(dwc, epnum); |
| WARN_ON(ret < 0); |
| } |
| } |
| } |
| |
| static void dwc3_ep0_complete_status(struct dwc3 *dwc, |
| const struct dwc3_event_depevt *event) |
| { |
| struct dwc3_request *r; |
| struct dwc3_ep *dep; |
| struct dwc3_trb *trb; |
| u32 status; |
| |
| dep = dwc->eps[0]; |
| trb = dwc->ep0_trb; |
| |
| trace_dwc3_complete_trb(dep, trb); |
| |
| if (!list_empty(&dep->pending_list)) { |
| r = next_request(&dep->pending_list); |
| |
| dwc3_gadget_giveback(dep, r, 0); |
| } |
| |
| if (dwc->test_mode) { |
| int ret; |
| |
| ret = dwc3_gadget_set_test_mode(dwc, dwc->test_mode_nr); |
| if (ret < 0) { |
| dwc3_trace(trace_dwc3_ep0, "Invalid Test #%d", |
| dwc->test_mode_nr); |
| dwc3_ep0_stall_and_restart(dwc); |
| return; |
| } |
| } |
| |
| status = DWC3_TRB_SIZE_TRBSTS(trb->size); |
| if (status == DWC3_TRBSTS_SETUP_PENDING) { |
| dwc->setup_packet_pending = true; |
| dwc3_trace(trace_dwc3_ep0, "Setup Pending received"); |
| } |
| |
| dwc->ep0state = EP0_SETUP_PHASE; |
| dwc3_ep0_out_start(dwc); |
| } |
| |
| static void dwc3_ep0_xfer_complete(struct dwc3 *dwc, |
| const struct dwc3_event_depevt *event) |
| { |
| struct dwc3_ep *dep = dwc->eps[event->endpoint_number]; |
| |
| dep->flags &= ~DWC3_EP_BUSY; |
| dep->resource_index = 0; |
| dwc->setup_packet_pending = false; |
| |
| switch (dwc->ep0state) { |
| case EP0_SETUP_PHASE: |
| dwc3_trace(trace_dwc3_ep0, "Setup Phase"); |
| dwc3_ep0_inspect_setup(dwc, event); |
| break; |
| |
| case EP0_DATA_PHASE: |
| dwc3_trace(trace_dwc3_ep0, "Data Phase"); |
| dwc3_ep0_complete_data(dwc, event); |
| break; |
| |
| case EP0_STATUS_PHASE: |
| dwc3_trace(trace_dwc3_ep0, "Status Phase"); |
| dwc3_ep0_complete_status(dwc, event); |
| break; |
| default: |
| WARN(true, "UNKNOWN ep0state %d\n", dwc->ep0state); |
| } |
| } |
| |
| static void __dwc3_ep0_do_control_data(struct dwc3 *dwc, |
| struct dwc3_ep *dep, struct dwc3_request *req) |
| { |
| int ret; |
| |
| req->direction = !!dep->number; |
| |
| if (req->request.length == 0) { |
| dwc3_ep0_prepare_one_trb(dwc, dep->number, |
| dwc->ctrl_req_addr, 0, |
| DWC3_TRBCTL_CONTROL_DATA, false); |
| ret = dwc3_ep0_start_trans(dwc, dep->number); |
| } else if (!IS_ALIGNED(req->request.length, dep->endpoint.maxpacket) |
| && (dep->number == 0)) { |
| u32 transfer_size = 0; |
| u32 maxpacket; |
| |
| ret = usb_gadget_map_request(&dwc->gadget, &req->request, |
| dep->number); |
| if (ret) { |
| dwc3_trace(trace_dwc3_ep0, "failed to map request"); |
| return; |
| } |
| |
| maxpacket = dep->endpoint.maxpacket; |
| |
| if (req->request.length > DWC3_EP0_BOUNCE_SIZE) { |
| transfer_size = ALIGN(req->request.length - maxpacket, |
| maxpacket); |
| dwc3_ep0_prepare_one_trb(dwc, dep->number, |
| req->request.dma, |
| transfer_size, |
| DWC3_TRBCTL_CONTROL_DATA, |
| true); |
| } |
| |
| transfer_size = roundup((req->request.length - transfer_size), |
| maxpacket); |
| |
| dwc->ep0_bounced = true; |
| |
| dwc3_ep0_prepare_one_trb(dwc, dep->number, |
| dwc->ep0_bounce_addr, transfer_size, |
| DWC3_TRBCTL_CONTROL_DATA, false); |
| ret = dwc3_ep0_start_trans(dwc, dep->number); |
| } else { |
| ret = usb_gadget_map_request(&dwc->gadget, &req->request, |
| dep->number); |
| if (ret) { |
| dwc3_trace(trace_dwc3_ep0, "failed to map request"); |
| return; |
| } |
| |
| dwc3_ep0_prepare_one_trb(dwc, dep->number, req->request.dma, |
| req->request.length, DWC3_TRBCTL_CONTROL_DATA, |
| false); |
| ret = dwc3_ep0_start_trans(dwc, dep->number); |
| } |
| |
| WARN_ON(ret < 0); |
| } |
| |
| static int dwc3_ep0_start_control_status(struct dwc3_ep *dep) |
| { |
| struct dwc3 *dwc = dep->dwc; |
| u32 type; |
| |
| type = dwc->three_stage_setup ? DWC3_TRBCTL_CONTROL_STATUS3 |
| : DWC3_TRBCTL_CONTROL_STATUS2; |
| |
| dwc3_ep0_prepare_one_trb(dwc, dep->number, |
| dwc->ctrl_req_addr, 0, type, false); |
| return dwc3_ep0_start_trans(dwc, dep->number); |
| } |
| |
| static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep) |
| { |
| WARN_ON(dwc3_ep0_start_control_status(dep)); |
| } |
| |
| static void dwc3_ep0_do_control_status(struct dwc3 *dwc, |
| const struct dwc3_event_depevt *event) |
| { |
| struct dwc3_ep *dep = dwc->eps[event->endpoint_number]; |
| |
| __dwc3_ep0_do_control_status(dwc, dep); |
| } |
| |
| static void dwc3_ep0_end_control_data(struct dwc3 *dwc, struct dwc3_ep *dep) |
| { |
| struct dwc3_gadget_ep_cmd_params params; |
| u32 cmd; |
| int ret; |
| |
| if (!dep->resource_index) |
| return; |
| |
| cmd = DWC3_DEPCMD_ENDTRANSFER; |
| cmd |= DWC3_DEPCMD_CMDIOC; |
| cmd |= DWC3_DEPCMD_PARAM(dep->resource_index); |
| memset(¶ms, 0, sizeof(params)); |
| ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms); |
| WARN_ON_ONCE(ret); |
| dep->resource_index = 0; |
| } |
| |
| static void dwc3_ep0_xfernotready(struct dwc3 *dwc, |
| const struct dwc3_event_depevt *event) |
| { |
| switch (event->status) { |
| case DEPEVT_STATUS_CONTROL_DATA: |
| dwc3_trace(trace_dwc3_ep0, "Control Data"); |
| |
| /* |
| * We already have a DATA transfer in the controller's cache, |
| * if we receive a XferNotReady(DATA) we will ignore it, unless |
| * it's for the wrong direction. |
| * |
| * In that case, we must issue END_TRANSFER command to the Data |
| * Phase we already have started and issue SetStall on the |
| * control endpoint. |
| */ |
| if (dwc->ep0_expect_in != event->endpoint_number) { |
| struct dwc3_ep *dep = dwc->eps[dwc->ep0_expect_in]; |
| |
| dwc3_trace(trace_dwc3_ep0, |
| "Wrong direction for Data phase"); |
| dwc3_ep0_end_control_data(dwc, dep); |
| dwc3_ep0_stall_and_restart(dwc); |
| return; |
| } |
| |
| break; |
| |
| case DEPEVT_STATUS_CONTROL_STATUS: |
| if (dwc->ep0_next_event != DWC3_EP0_NRDY_STATUS) |
| return; |
| |
| dwc3_trace(trace_dwc3_ep0, "Control Status"); |
| |
| dwc->ep0state = EP0_STATUS_PHASE; |
| |
| if (dwc->delayed_status) { |
| WARN_ON_ONCE(event->endpoint_number != 1); |
| dwc3_trace(trace_dwc3_ep0, "Delayed Status"); |
| return; |
| } |
| |
| dwc3_ep0_do_control_status(dwc, event); |
| } |
| } |
| |
| void dwc3_ep0_interrupt(struct dwc3 *dwc, |
| const struct dwc3_event_depevt *event) |
| { |
| dwc3_trace(trace_dwc3_ep0, "%s: state '%s'", |
| dwc3_ep_event_string(event), |
| dwc3_ep0_state_string(dwc->ep0state)); |
| |
| switch (event->endpoint_event) { |
| case DWC3_DEPEVT_XFERCOMPLETE: |
| dwc3_ep0_xfer_complete(dwc, event); |
| break; |
| |
| case DWC3_DEPEVT_XFERNOTREADY: |
| dwc3_ep0_xfernotready(dwc, event); |
| break; |
| |
| case DWC3_DEPEVT_XFERINPROGRESS: |
| case DWC3_DEPEVT_RXTXFIFOEVT: |
| case DWC3_DEPEVT_STREAMEVT: |
| case DWC3_DEPEVT_EPCMDCMPLT: |
| break; |
| } |
| } |