--- /dev/null
+/*
+ * Driver for the NXP ISP1761 device controller
+ *
+ * Copyright 2014 Ideas on Board Oy
+ *
+ * Contacts:
+ * Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/timer.h>
+#include <linux/usb.h>
+
+#include "isp1760-core.h"
+#include "isp1760-regs.h"
+#include "isp1760-udc.h"
+
+#define ISP1760_VBUS_POLL_INTERVAL msecs_to_jiffies(500)
+
+struct isp1760_request {
+ struct usb_request req;
+ struct list_head queue;
+ struct isp1760_ep *ep;
+ unsigned int packet_size;
+};
+
+static inline struct isp1760_udc *gadget_to_udc(struct usb_gadget *gadget)
+{
+ return container_of(gadget, struct isp1760_udc, gadget);
+}
+
+static inline struct isp1760_ep *ep_to_udc_ep(struct usb_ep *ep)
+{
+ return container_of(ep, struct isp1760_ep, ep);
+}
+
+static inline struct isp1760_request *req_to_udc_req(struct usb_request *req)
+{
+ return container_of(req, struct isp1760_request, req);
+}
+
+static inline u32 isp1760_udc_read(struct isp1760_udc *udc, u16 reg)
+{
+ return isp1760_read32(udc->regs, reg);
+}
+
+static inline void isp1760_udc_write(struct isp1760_udc *udc, u16 reg, u32 val)
+{
+ isp1760_write32(udc->regs, reg, val);
+}
+
+/* -----------------------------------------------------------------------------
+ * Endpoint Management
+ */
+
+static struct isp1760_ep *isp1760_udc_find_ep(struct isp1760_udc *udc,
+ u16 index)
+{
+ unsigned int i;
+
+ if (index == 0)
+ return &udc->ep[0];
+
+ for (i = 1; i < ARRAY_SIZE(udc->ep); ++i) {
+ if (udc->ep[i].addr == index)
+ return udc->ep[i].desc ? &udc->ep[i] : NULL;
+ }
+
+ return NULL;
+}
+
+static void __isp1760_udc_select_ep(struct isp1760_ep *ep, int dir)
+{
+ isp1760_udc_write(ep->udc, DC_EPINDEX,
+ DC_ENDPIDX(ep->addr & USB_ENDPOINT_NUMBER_MASK) |
+ (dir == USB_DIR_IN ? DC_EPDIR : 0));
+}
+
+/**
+ * isp1760_udc_select_ep - Select an endpoint for register access
+ * @ep: The endpoint
+ *
+ * The ISP1761 endpoint registers are banked. This function selects the target
+ * endpoint for banked register access. The selection remains valid until the
+ * next call to this function, the next direct access to the EPINDEX register
+ * or the next reset, whichever comes first.
+ *
+ * Called with the UDC spinlock held.
+ */
+static void isp1760_udc_select_ep(struct isp1760_ep *ep)
+{
+ __isp1760_udc_select_ep(ep, ep->addr & USB_ENDPOINT_DIR_MASK);
+}
+
+/* Called with the UDC spinlock held. */
+static void isp1760_udc_ctrl_send_status(struct isp1760_ep *ep, int dir)
+{
+ struct isp1760_udc *udc = ep->udc;
+
+ /*
+ * Proceed to the status stage. The status stage data packet flows in
+ * the direction opposite to the data stage data packets, we thus need
+ * to select the OUT/IN endpoint for IN/OUT transfers.
+ */
+ isp1760_udc_write(udc, DC_EPINDEX, DC_ENDPIDX(0) |
+ (dir == USB_DIR_IN ? 0 : DC_EPDIR));
+ isp1760_udc_write(udc, DC_CTRLFUNC, DC_STATUS);
+
+ /*
+ * The hardware will terminate the request automatically and go back to
+ * the setup stage without notifying us.
+ */
+ udc->ep0_state = ISP1760_CTRL_SETUP;
+}
+
+/* Called without the UDC spinlock held. */
+static void isp1760_udc_request_complete(struct isp1760_ep *ep,
+ struct isp1760_request *req,
+ int status)
+{
+ struct isp1760_udc *udc = ep->udc;
+ unsigned long flags;
+
+ dev_dbg(ep->udc->isp->dev, "completing request %p with status %d\n",
+ req, status);
+
+ req->ep = NULL;
+ req->req.status = status;
+ req->req.complete(&ep->ep, &req->req);
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ /*
+ * When completing control OUT requests, move to the status stage after
+ * calling the request complete callback. This gives the gadget an
+ * opportunity to stall the control transfer if needed.
+ */
+ if (status == 0 && ep->addr == 0 && udc->ep0_dir == USB_DIR_OUT)
+ isp1760_udc_ctrl_send_status(ep, USB_DIR_OUT);
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+}
+
+static void isp1760_udc_ctrl_send_stall(struct isp1760_ep *ep)
+{
+ struct isp1760_udc *udc = ep->udc;
+ unsigned long flags;
+
+ dev_dbg(ep->udc->isp->dev, "%s(ep%02x)\n", __func__, ep->addr);
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ /* Stall both the IN and OUT endpoints. */
+ __isp1760_udc_select_ep(ep, USB_DIR_OUT);
+ isp1760_udc_write(udc, DC_CTRLFUNC, DC_STALL);
+ __isp1760_udc_select_ep(ep, USB_DIR_IN);
+ isp1760_udc_write(udc, DC_CTRLFUNC, DC_STALL);
+
+ /* A protocol stall completes the control transaction. */
+ udc->ep0_state = ISP1760_CTRL_SETUP;
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+}
+
+/* -----------------------------------------------------------------------------
+ * Data Endpoints
+ */
+
+/* Called with the UDC spinlock held. */
+static bool isp1760_udc_receive(struct isp1760_ep *ep,
+ struct isp1760_request *req)
+{
+ struct isp1760_udc *udc = ep->udc;
+ unsigned int len;
+ u32 *buf;
+ int i;
+
+ isp1760_udc_select_ep(ep);
+ len = isp1760_udc_read(udc, DC_BUFLEN) & DC_DATACOUNT_MASK;
+
+ dev_dbg(udc->isp->dev, "%s: received %u bytes (%u/%u done)\n",
+ __func__, len, req->req.actual, req->req.length);
+
+ len = min(len, req->req.length - req->req.actual);
+
+ if (!len) {
+ /*
+ * There's no data to be read from the FIFO, acknowledge the RX
+ * interrupt by clearing the buffer.
+ *
+ * TODO: What if another packet arrives in the meantime ? The
+ * datasheet doesn't clearly document how this should be
+ * handled.
+ */
+ isp1760_udc_write(udc, DC_CTRLFUNC, DC_CLBUF);
+ return false;
+ }
+
+ buf = req->req.buf + req->req.actual;
+
+ /*
+ * Make sure not to read more than one extra byte, otherwise data from
+ * the next packet might be removed from the FIFO.
+ */
+ for (i = len; i > 2; i -= 4, ++buf)
+ *buf = le32_to_cpu(isp1760_udc_read(udc, DC_DATAPORT));
+ if (i > 0)
+ *(u16 *)buf = le16_to_cpu(readw(udc->regs + DC_DATAPORT));
+
+ req->req.actual += len;
+
+ /*
+ * TODO: The short_not_ok flag isn't supported yet, but isn't used by
+ * any gadget driver either.
+ */
+
+ dev_dbg(udc->isp->dev,
+ "%s: req %p actual/length %u/%u maxpacket %u packet size %u\n",
+ __func__, req, req->req.actual, req->req.length, ep->maxpacket,
+ len);
+
+ ep->rx_pending = false;
+
+ /*
+ * Complete the request if all data has been received or if a short
+ * packet has been received.
+ */
+ if (req->req.actual == req->req.length || len < ep->maxpacket) {
+ list_del(&req->queue);
+ return true;
+ }
+
+ return false;
+}
+
+static void isp1760_udc_transmit(struct isp1760_ep *ep,
+ struct isp1760_request *req)
+{
+ struct isp1760_udc *udc = ep->udc;
+ u32 *buf = req->req.buf + req->req.actual;
+ int i;
+
+ req->packet_size = min(req->req.length - req->req.actual,
+ ep->maxpacket);
+
+ dev_dbg(udc->isp->dev, "%s: transferring %u bytes (%u/%u done)\n",
+ __func__, req->packet_size, req->req.actual,
+ req->req.length);
+
+ __isp1760_udc_select_ep(ep, USB_DIR_IN);
+
+ if (req->packet_size)
+ isp1760_udc_write(udc, DC_BUFLEN, req->packet_size);
+
+ /*
+ * Make sure not to write more than one extra byte, otherwise extra data
+ * will stay in the FIFO and will be transmitted during the next control
+ * request. The endpoint control CLBUF bit is supposed to allow flushing
+ * the FIFO for this kind of conditions, but doesn't seem to work.
+ */
+ for (i = req->packet_size; i > 2; i -= 4, ++buf)
+ isp1760_udc_write(udc, DC_DATAPORT, cpu_to_le32(*buf));
+ if (i > 0)
+ writew(cpu_to_le16(*(u16 *)buf), udc->regs + DC_DATAPORT);
+
+ if (ep->addr == 0)
+ isp1760_udc_write(udc, DC_CTRLFUNC, DC_DSEN);
+ if (!req->packet_size)
+ isp1760_udc_write(udc, DC_CTRLFUNC, DC_VENDP);
+}
+
+static void isp1760_ep_rx_ready(struct isp1760_ep *ep)
+{
+ struct isp1760_udc *udc = ep->udc;
+ struct isp1760_request *req;
+ bool complete;
+
+ spin_lock(&udc->lock);
+
+ if (ep->addr == 0 && udc->ep0_state != ISP1760_CTRL_DATA_OUT) {
+ spin_unlock(&udc->lock);
+ dev_dbg(udc->isp->dev, "%s: invalid ep0 state %u\n", __func__,
+ udc->ep0_state);
+ return;
+ }
+
+ if (ep->addr != 0 && !ep->desc) {
+ spin_unlock(&udc->lock);
+ dev_dbg(udc->isp->dev, "%s: ep%02x is disabled\n", __func__,
+ ep->addr);
+ return;
+ }
+
+ if (list_empty(&ep->queue)) {
+ ep->rx_pending = true;
+ spin_unlock(&udc->lock);
+ dev_dbg(udc->isp->dev, "%s: ep%02x (%p) has no request queued\n",
+ __func__, ep->addr, ep);
+ return;
+ }
+
+ req = list_first_entry(&ep->queue, struct isp1760_request,
+ queue);
+ complete = isp1760_udc_receive(ep, req);
+
+ spin_unlock(&udc->lock);
+
+ if (complete)
+ isp1760_udc_request_complete(ep, req, 0);
+}
+
+static void isp1760_ep_tx_complete(struct isp1760_ep *ep)
+{
+ struct isp1760_udc *udc = ep->udc;
+ struct isp1760_request *complete = NULL;
+ struct isp1760_request *req;
+ bool need_zlp;
+
+ spin_lock(&udc->lock);
+
+ if (ep->addr == 0 && udc->ep0_state != ISP1760_CTRL_DATA_IN) {
+ spin_unlock(&udc->lock);
+ dev_dbg(udc->isp->dev, "TX IRQ: invalid endpoint state %u\n",
+ udc->ep0_state);
+ return;
+ }
+
+ if (list_empty(&ep->queue)) {
+ /*
+ * This can happen for the control endpoint when the reply to
+ * the GET_STATUS IN control request is sent directly by the
+ * setup IRQ handler. Just proceed to the status stage.
+ */
+ if (ep->addr == 0) {
+ isp1760_udc_ctrl_send_status(ep, USB_DIR_IN);
+ spin_unlock(&udc->lock);
+ return;
+ }
+
+ spin_unlock(&udc->lock);
+ dev_dbg(udc->isp->dev, "%s: ep%02x has no request queued\n",
+ __func__, ep->addr);
+ return;
+ }
+
+ req = list_first_entry(&ep->queue, struct isp1760_request,
+ queue);
+ req->req.actual += req->packet_size;
+
+ need_zlp = req->req.actual == req->req.length &&
+ !(req->req.length % ep->maxpacket) &&
+ req->packet_size && req->req.zero;
+
+ dev_dbg(udc->isp->dev,
+ "TX IRQ: req %p actual/length %u/%u maxpacket %u packet size %u zero %u need zlp %u\n",
+ req, req->req.actual, req->req.length, ep->maxpacket,
+ req->packet_size, req->req.zero, need_zlp);
+
+ /*
+ * Complete the request if all data has been sent and we don't need to
+ * transmit a zero length packet.
+ */
+ if (req->req.actual == req->req.length && !need_zlp) {
+ complete = req;
+ list_del(&req->queue);
+
+ if (ep->addr == 0)
+ isp1760_udc_ctrl_send_status(ep, USB_DIR_IN);
+
+ if (!list_empty(&ep->queue))
+ req = list_first_entry(&ep->queue,
+ struct isp1760_request, queue);
+ else
+ req = NULL;
+ }
+
+ /*
+ * Transmit the next packet or start the next request, if any.
+ *
+ * TODO: If the endpoint is stalled the next request shouldn't be
+ * started, but what about the next packet ?
+ */
+ if (req)
+ isp1760_udc_transmit(ep, req);
+
+ spin_unlock(&udc->lock);
+
+ if (complete)
+ isp1760_udc_request_complete(ep, complete, 0);
+}
+
+static int __isp1760_udc_set_halt(struct isp1760_ep *ep, bool halt)
+{
+ struct isp1760_udc *udc = ep->udc;
+
+ dev_dbg(udc->isp->dev, "%s: %s halt on ep%02x\n", __func__,
+ halt ? "set" : "clear", ep->addr);
+
+ if (ep->desc && usb_endpoint_xfer_isoc(ep->desc)) {
+ dev_dbg(udc->isp->dev, "%s: ep%02x is isochronous\n", __func__,
+ ep->addr);
+ return -EINVAL;
+ }
+
+ isp1760_udc_select_ep(ep);
+ isp1760_udc_write(udc, DC_CTRLFUNC, halt ? DC_STALL : 0);
+
+ if (ep->addr == 0) {
+ /* When halting the control endpoint, stall both IN and OUT. */
+ __isp1760_udc_select_ep(ep, USB_DIR_IN);
+ isp1760_udc_write(udc, DC_CTRLFUNC, halt ? DC_STALL : 0);
+ } else if (!halt) {
+ /* Reset the data PID by cycling the endpoint enable bit. */
+ u16 eptype = isp1760_udc_read(udc, DC_EPTYPE);
+
+ isp1760_udc_write(udc, DC_EPTYPE, eptype & ~DC_EPENABLE);
+ isp1760_udc_write(udc, DC_EPTYPE, eptype);
+
+ /*
+ * Disabling the endpoint emptied the transmit FIFO, fill it
+ * again if a request is pending.
+ *
+ * TODO: Does the gadget framework require synchronizatino with
+ * the TX IRQ handler ?
+ */
+ if ((ep->addr & USB_DIR_IN) && !list_empty(&ep->queue)) {
+ struct isp1760_request *req;
+
+ req = list_first_entry(&ep->queue,
+ struct isp1760_request, queue);
+ isp1760_udc_transmit(ep, req);
+ }
+ }
+
+ ep->halted = halt;
+
+ return 0;
+}
+
+/* -----------------------------------------------------------------------------
+ * Control Endpoint
+ */
+
+static int isp1760_udc_get_status(struct isp1760_udc *udc,
+ const struct usb_ctrlrequest *req)
+{
+ struct isp1760_ep *ep;
+ u16 status;
+
+ if (req->wLength != cpu_to_le16(2) || req->wValue != cpu_to_le16(0))
+ return -EINVAL;
+
+ switch (req->bRequestType) {
+ case USB_DIR_IN | USB_RECIP_DEVICE:
+ status = udc->devstatus;
+ break;
+
+ case USB_DIR_IN | USB_RECIP_INTERFACE:
+ status = 0;
+ break;
+
+ case USB_DIR_IN | USB_RECIP_ENDPOINT:
+ ep = isp1760_udc_find_ep(udc, le16_to_cpu(req->wIndex));
+ if (!ep)
+ return -EINVAL;
+
+ status = 0;
+ if (ep->halted)
+ status |= 1 << USB_ENDPOINT_HALT;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ isp1760_udc_write(udc, DC_EPINDEX, DC_ENDPIDX(0) | DC_EPDIR);
+ isp1760_udc_write(udc, DC_BUFLEN, 2);
+
+ writew(cpu_to_le16(status), udc->regs + DC_DATAPORT);
+
+ isp1760_udc_write(udc, DC_CTRLFUNC, DC_DSEN);
+
+ dev_dbg(udc->isp->dev, "%s: status 0x%04x\n", __func__, status);
+
+ return 0;
+}
+
+static int isp1760_udc_set_address(struct isp1760_udc *udc, u16 addr)
+{
+ if (addr > 127) {
+ dev_dbg(udc->isp->dev, "invalid device address %u\n", addr);
+ return -EINVAL;
+ }
+
+ if (udc->gadget.state != USB_STATE_DEFAULT &&
+ udc->gadget.state != USB_STATE_ADDRESS) {
+ dev_dbg(udc->isp->dev, "can't set address in state %u\n",
+ udc->gadget.state);
+ return -EINVAL;
+ }
+
+ usb_gadget_set_state(&udc->gadget, addr ? USB_STATE_ADDRESS :
+ USB_STATE_DEFAULT);
+
+ isp1760_udc_write(udc, DC_ADDRESS, DC_DEVEN | addr);
+
+ spin_lock(&udc->lock);
+ isp1760_udc_ctrl_send_status(&udc->ep[0], USB_DIR_OUT);
+ spin_unlock(&udc->lock);
+
+ return 0;
+}
+
+static bool isp1760_ep0_setup_standard(struct isp1760_udc *udc,
+ struct usb_ctrlrequest *req)
+{
+ bool stall;
+
+ switch (req->bRequest) {
+ case USB_REQ_GET_STATUS:
+ return isp1760_udc_get_status(udc, req);
+
+ case USB_REQ_CLEAR_FEATURE:
+ switch (req->bRequestType) {
+ case USB_DIR_OUT | USB_RECIP_DEVICE: {
+ /* TODO: Handle remote wakeup feature. */
+ return true;
+ }
+
+ case USB_DIR_OUT | USB_RECIP_ENDPOINT: {
+ u16 index = le16_to_cpu(req->wIndex);
+ struct isp1760_ep *ep;
+
+ if (req->wLength != cpu_to_le16(0) ||
+ req->wValue != cpu_to_le16(USB_ENDPOINT_HALT))
+ return true;
+
+ ep = isp1760_udc_find_ep(udc, index);
+ if (!ep)
+ return true;
+
+ spin_lock(&udc->lock);
+
+ /*
+ * If the endpoint is wedged only the gadget can clear
+ * the halt feature. Pretend success in that case, but
+ * keep the endpoint halted.
+ */
+ if (!ep->wedged)
+ stall = __isp1760_udc_set_halt(ep, false);
+ else
+ stall = false;
+
+ if (!stall)
+ isp1760_udc_ctrl_send_status(&udc->ep[0],
+ USB_DIR_OUT);
+
+ spin_unlock(&udc->lock);
+ return stall;
+ }
+
+ default:
+ return true;
+ }
+ break;
+
+ case USB_REQ_SET_FEATURE:
+ switch (req->bRequestType) {
+ case USB_DIR_OUT | USB_RECIP_DEVICE: {
+ /* TODO: Handle remote wakeup and test mode features */
+ return true;
+ }
+
+ case USB_DIR_OUT | USB_RECIP_ENDPOINT: {
+ u16 index = le16_to_cpu(req->wIndex);
+ struct isp1760_ep *ep;
+
+ if (req->wLength != cpu_to_le16(0) ||
+ req->wValue != cpu_to_le16(USB_ENDPOINT_HALT))
+ return true;
+
+ ep = isp1760_udc_find_ep(udc, index);
+ if (!ep)
+ return true;
+
+ spin_lock(&udc->lock);
+
+ stall = __isp1760_udc_set_halt(ep, true);
+ if (!stall)
+ isp1760_udc_ctrl_send_status(&udc->ep[0],
+ USB_DIR_OUT);
+
+ spin_unlock(&udc->lock);
+ return stall;
+ }
+
+ default:
+ return true;
+ }
+ break;
+
+ case USB_REQ_SET_ADDRESS:
+ if (req->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE))
+ return true;
+
+ return isp1760_udc_set_address(udc, le16_to_cpu(req->wValue));
+
+ case USB_REQ_SET_CONFIGURATION:
+ if (req->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE))
+ return true;
+
+ if (udc->gadget.state != USB_STATE_ADDRESS &&
+ udc->gadget.state != USB_STATE_CONFIGURED)
+ return true;
+
+ stall = udc->driver->setup(&udc->gadget, req) < 0;
+ if (stall)
+ return true;
+
+ usb_gadget_set_state(&udc->gadget, req->wValue ?
+ USB_STATE_CONFIGURED : USB_STATE_ADDRESS);
+
+ /*
+ * SET_CONFIGURATION (and SET_INTERFACE) must reset the halt
+ * feature on all endpoints. There is however no need to do so
+ * explicitly here as the gadget driver will disable and
+ * reenable endpoints, clearing the halt feature.
+ */
+ return false;
+
+ default:
+ return udc->driver->setup(&udc->gadget, req) < 0;
+ }
+}
+
+static void isp1760_ep0_setup(struct isp1760_udc *udc)
+{
+ union {
+ struct usb_ctrlrequest r;
+ u32 data[2];
+ } req;
+ unsigned int count;
+ bool stall = false;
+
+ spin_lock(&udc->lock);
+
+ isp1760_udc_write(udc, DC_EPINDEX, DC_EP0SETUP);
+
+ count = isp1760_udc_read(udc, DC_BUFLEN) & DC_DATACOUNT_MASK;
+ if (count != sizeof(req)) {
+ spin_unlock(&udc->lock);
+
+ dev_err(udc->isp->dev, "invalid length %u for setup packet\n",
+ count);
+
+ isp1760_udc_ctrl_send_stall(&udc->ep[0]);
+ return;
+ }
+
+ req.data[0] = isp1760_udc_read(udc, DC_DATAPORT);
+ req.data[1] = isp1760_udc_read(udc, DC_DATAPORT);
+
+ if (udc->ep0_state != ISP1760_CTRL_SETUP) {
+ spin_unlock(&udc->lock);
+ dev_dbg(udc->isp->dev, "unexpected SETUP packet\n");
+ return;
+ }
+
+ /* Move to the data stage. */
+ if (!req.r.wLength)
+ udc->ep0_state = ISP1760_CTRL_STATUS;
+ else if (req.r.bRequestType & USB_DIR_IN)
+ udc->ep0_state = ISP1760_CTRL_DATA_IN;
+ else
+ udc->ep0_state = ISP1760_CTRL_DATA_OUT;
+
+ udc->ep0_dir = req.r.bRequestType & USB_DIR_IN;
+ udc->ep0_length = le16_to_cpu(req.r.wLength);
+
+ spin_unlock(&udc->lock);
+
+ dev_dbg(udc->isp->dev,
+ "%s: bRequestType 0x%02x bRequest 0x%02x wValue 0x%04x wIndex 0x%04x wLength 0x%04x\n",
+ __func__, req.r.bRequestType, req.r.bRequest,
+ le16_to_cpu(req.r.wValue), le16_to_cpu(req.r.wIndex),
+ le16_to_cpu(req.r.wLength));
+
+ if ((req.r.bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
+ stall = isp1760_ep0_setup_standard(udc, &req.r);
+ else
+ stall = udc->driver->setup(&udc->gadget, &req.r) < 0;
+
+ if (stall)
+ isp1760_udc_ctrl_send_stall(&udc->ep[0]);
+}
+
+/* -----------------------------------------------------------------------------
+ * Gadget Endpoint Operations
+ */
+
+static int isp1760_ep_enable(struct usb_ep *ep,
+ const struct usb_endpoint_descriptor *desc)
+{
+ struct isp1760_ep *uep = ep_to_udc_ep(ep);
+ struct isp1760_udc *udc = uep->udc;
+ unsigned long flags;
+ unsigned int type;
+
+ dev_dbg(uep->udc->isp->dev, "%s\n", __func__);
+
+ /*
+ * Validate the descriptor. The control endpoint can't be enabled
+ * manually.
+ */
+ if (desc->bDescriptorType != USB_DT_ENDPOINT ||
+ desc->bEndpointAddress == 0 ||
+ desc->bEndpointAddress != uep->addr ||
+ le16_to_cpu(desc->wMaxPacketSize) > ep->maxpacket) {
+ dev_dbg(udc->isp->dev,
+ "%s: invalid descriptor type %u addr %02x ep addr %02x max packet size %u/%u\n",
+ __func__, desc->bDescriptorType,
+ desc->bEndpointAddress, uep->addr,
+ le16_to_cpu(desc->wMaxPacketSize), ep->maxpacket);
+ return -EINVAL;
+ }
+
+ switch (usb_endpoint_type(desc)) {
+ case USB_ENDPOINT_XFER_ISOC:
+ type = DC_ENDPTYP_ISOC;
+ break;
+ case USB_ENDPOINT_XFER_BULK:
+ type = DC_ENDPTYP_BULK;
+ break;
+ case USB_ENDPOINT_XFER_INT:
+ type = DC_ENDPTYP_INTERRUPT;
+ break;
+ case USB_ENDPOINT_XFER_CONTROL:
+ default:
+ dev_dbg(udc->isp->dev, "%s: control endpoints unsupported\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ uep->desc = desc;
+ uep->maxpacket = le16_to_cpu(desc->wMaxPacketSize);
+ uep->rx_pending = false;
+ uep->halted = false;
+ uep->wedged = false;
+
+ isp1760_udc_select_ep(uep);
+ isp1760_udc_write(udc, DC_EPMAXPKTSZ, uep->maxpacket);
+ isp1760_udc_write(udc, DC_BUFLEN, uep->maxpacket);
+ isp1760_udc_write(udc, DC_EPTYPE, DC_EPENABLE | type);
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+
+ return 0;
+}
+
+static int isp1760_ep_disable(struct usb_ep *ep)
+{
+ struct isp1760_ep *uep = ep_to_udc_ep(ep);
+ struct isp1760_udc *udc = uep->udc;
+ struct isp1760_request *req, *nreq;
+ LIST_HEAD(req_list);
+ unsigned long flags;
+
+ dev_dbg(udc->isp->dev, "%s\n", __func__);
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ if (!uep->desc) {
+ dev_dbg(udc->isp->dev, "%s: endpoint not enabled\n", __func__);
+ spin_unlock_irqrestore(&udc->lock, flags);
+ return -EINVAL;
+ }
+
+ uep->desc = NULL;
+ uep->maxpacket = 0;
+
+ isp1760_udc_select_ep(uep);
+ isp1760_udc_write(udc, DC_EPTYPE, 0);
+
+ /* TODO Synchronize with the IRQ handler */
+
+ list_splice_init(&uep->queue, &req_list);
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+
+ list_for_each_entry_safe(req, nreq, &req_list, queue) {
+ list_del(&req->queue);
+ isp1760_udc_request_complete(uep, req, -ESHUTDOWN);
+ }
+
+ return 0;
+}
+
+static struct usb_request *isp1760_ep_alloc_request(struct usb_ep *ep,
+ gfp_t gfp_flags)
+{
+ struct isp1760_request *req;
+
+ req = kzalloc(sizeof(*req), gfp_flags);
+
+ return &req->req;
+}
+
+static void isp1760_ep_free_request(struct usb_ep *ep, struct usb_request *_req)
+{
+ struct isp1760_request *req = req_to_udc_req(_req);
+
+ kfree(req);
+}
+
+static int isp1760_ep_queue(struct usb_ep *ep, struct usb_request *_req,
+ gfp_t gfp_flags)
+{
+ struct isp1760_request *req = req_to_udc_req(_req);
+ struct isp1760_ep *uep = ep_to_udc_ep(ep);
+ struct isp1760_udc *udc = uep->udc;
+ bool complete = false;
+ unsigned long flags;
+ int ret = 0;
+
+ _req->status = -EINPROGRESS;
+ _req->actual = 0;
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ dev_dbg(udc->isp->dev,
+ "%s: req %p (%u bytes%s) ep %p(0x%02x)\n", __func__, _req,
+ _req->length, _req->zero ? " (zlp)" : "", uep, uep->addr);
+
+ req->ep = uep;
+
+ if (uep->addr == 0) {
+ if (_req->length != udc->ep0_length &&
+ udc->ep0_state != ISP1760_CTRL_DATA_IN) {
+ dev_dbg(udc->isp->dev,
+ "%s: invalid length %u for req %p\n",
+ __func__, _req->length, req);
+ ret = -EINVAL;
+ goto done;
+ }
+
+ switch (udc->ep0_state) {
+ case ISP1760_CTRL_DATA_IN:
+ dev_dbg(udc->isp->dev, "%s: transmitting req %p\n",
+ __func__, req);
+
+ list_add_tail(&req->queue, &uep->queue);
+ isp1760_udc_transmit(uep, req);
+ break;
+
+ case ISP1760_CTRL_DATA_OUT:
+ list_add_tail(&req->queue, &uep->queue);
+ __isp1760_udc_select_ep(uep, USB_DIR_OUT);
+ isp1760_udc_write(udc, DC_CTRLFUNC, DC_DSEN);
+ break;
+
+ case ISP1760_CTRL_STATUS:
+ complete = true;
+ break;
+
+ default:
+ dev_dbg(udc->isp->dev, "%s: invalid ep0 state\n",
+ __func__);
+ ret = -EINVAL;
+ break;
+ }
+ } else if (uep->desc) {
+ bool empty = list_empty(&uep->queue);
+
+ list_add_tail(&req->queue, &uep->queue);
+ if ((uep->addr & USB_DIR_IN) && !uep->halted && empty)
+ isp1760_udc_transmit(uep, req);
+ else if (!(uep->addr & USB_DIR_IN) && uep->rx_pending)
+ complete = isp1760_udc_receive(uep, req);
+ } else {
+ dev_dbg(udc->isp->dev,
+ "%s: can't queue request to disabled ep%02x\n",
+ __func__, uep->addr);
+ ret = -ESHUTDOWN;
+ }
+
+done:
+ if (ret < 0)
+ req->ep = NULL;
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+
+ if (complete)
+ isp1760_udc_request_complete(uep, req, 0);
+
+ return ret;
+}
+
+static int isp1760_ep_dequeue(struct usb_ep *ep, struct usb_request *_req)
+{
+ struct isp1760_request *req = req_to_udc_req(_req);
+ struct isp1760_ep *uep = ep_to_udc_ep(ep);
+ struct isp1760_udc *udc = uep->udc;
+ unsigned long flags;
+
+ dev_dbg(uep->udc->isp->dev, "%s(ep%02x)\n", __func__, uep->addr);
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ if (req->ep != uep)
+ req = NULL;
+ else
+ list_del(&req->queue);
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+
+ if (!req)
+ return -EINVAL;
+
+ isp1760_udc_request_complete(uep, req, -ECONNRESET);
+ return 0;
+}
+
+static int __isp1760_ep_set_halt(struct isp1760_ep *uep, bool stall, bool wedge)
+{
+ struct isp1760_udc *udc = uep->udc;
+ int ret;
+
+ if (!uep->addr) {
+ /*
+ * Halting the control endpoint is only valid as a delayed error
+ * response to a SETUP packet. Make sure EP0 is in the right
+ * stage and that the gadget isn't trying to clear the halt
+ * condition.
+ */
+ if (WARN_ON(udc->ep0_state == ISP1760_CTRL_SETUP || !stall ||
+ wedge)) {
+ return -EINVAL;
+ }
+ }
+
+ if (uep->addr && !uep->desc) {
+ dev_dbg(udc->isp->dev, "%s: ep%02x is disabled\n", __func__,
+ uep->addr);
+ return -EINVAL;
+ }
+
+ if (uep->addr & USB_DIR_IN) {
+ /* Refuse to halt IN endpoints with active transfers. */
+ if (!list_empty(&uep->queue)) {
+ dev_dbg(udc->isp->dev,
+ "%s: ep%02x has request pending\n", __func__,
+ uep->addr);
+ return -EAGAIN;
+ }
+ }
+
+ ret = __isp1760_udc_set_halt(uep, stall);
+ if (ret < 0)
+ return ret;
+
+ if (!uep->addr) {
+ /*
+ * Stalling EP0 completes the control transaction, move back to
+ * the SETUP state.
+ */
+ udc->ep0_state = ISP1760_CTRL_SETUP;
+ return 0;
+ }
+
+ if (wedge)
+ uep->wedged = true;
+ else if (!stall)
+ uep->wedged = false;
+
+ return 0;
+}
+
+static int isp1760_ep_set_halt(struct usb_ep *ep, int value)
+{
+ struct isp1760_ep *uep = ep_to_udc_ep(ep);
+ unsigned long flags;
+ int ret;
+
+ dev_dbg(uep->udc->isp->dev, "%s: %s halt on ep%02x\n", __func__,
+ value ? "set" : "clear", uep->addr);
+
+ spin_lock_irqsave(&uep->udc->lock, flags);
+ ret = __isp1760_ep_set_halt(uep, value, false);
+ spin_unlock_irqrestore(&uep->udc->lock, flags);
+
+ return ret;
+}
+
+static int isp1760_ep_set_wedge(struct usb_ep *ep)
+{
+ struct isp1760_ep *uep = ep_to_udc_ep(ep);
+ unsigned long flags;
+ int ret;
+
+ dev_dbg(uep->udc->isp->dev, "%s: set wedge on ep%02x)\n", __func__,
+ uep->addr);
+
+ spin_lock_irqsave(&uep->udc->lock, flags);
+ ret = __isp1760_ep_set_halt(uep, true, true);
+ spin_unlock_irqrestore(&uep->udc->lock, flags);
+
+ return ret;
+}
+
+static void isp1760_ep_fifo_flush(struct usb_ep *ep)
+{
+ struct isp1760_ep *uep = ep_to_udc_ep(ep);
+ struct isp1760_udc *udc = uep->udc;
+ unsigned long flags;
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ isp1760_udc_select_ep(uep);
+
+ /*
+ * Set the CLBUF bit twice to flush both buffers in case double
+ * buffering is enabled.
+ */
+ isp1760_udc_write(udc, DC_CTRLFUNC, DC_CLBUF);
+ isp1760_udc_write(udc, DC_CTRLFUNC, DC_CLBUF);
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+}
+
+static const struct usb_ep_ops isp1760_ep_ops = {
+ .enable = isp1760_ep_enable,
+ .disable = isp1760_ep_disable,
+ .alloc_request = isp1760_ep_alloc_request,
+ .free_request = isp1760_ep_free_request,
+ .queue = isp1760_ep_queue,
+ .dequeue = isp1760_ep_dequeue,
+ .set_halt = isp1760_ep_set_halt,
+ .set_wedge = isp1760_ep_set_wedge,
+ .fifo_flush = isp1760_ep_fifo_flush,
+};
+
+/* -----------------------------------------------------------------------------
+ * Device States
+ */
+
+/* Called with the UDC spinlock held. */
+static void isp1760_udc_connect(struct isp1760_udc *udc)
+{
+ usb_gadget_set_state(&udc->gadget, USB_STATE_POWERED);
+ mod_timer(&udc->vbus_timer, jiffies + ISP1760_VBUS_POLL_INTERVAL);
+}
+
+/* Called with the UDC spinlock held. */
+static void isp1760_udc_disconnect(struct isp1760_udc *udc)
+{
+ if (udc->gadget.state < USB_STATE_POWERED)
+ return;
+
+ dev_dbg(udc->isp->dev, "Device disconnected in state %u\n",
+ udc->gadget.state);
+
+ udc->gadget.speed = USB_SPEED_UNKNOWN;
+ usb_gadget_set_state(&udc->gadget, USB_STATE_ATTACHED);
+
+ if (udc->driver->disconnect)
+ udc->driver->disconnect(&udc->gadget);
+
+ del_timer(&udc->vbus_timer);
+
+ /* TODO Reset all endpoints ? */
+}
+
+static void isp1760_udc_init_hw(struct isp1760_udc *udc)
+{
+ /*
+ * The device controller currently shares its interrupt with the host
+ * controller, the DC_IRQ polarity and signaling mode are ignored. Set
+ * the to active-low level-triggered.
+ *
+ * Configure the control, in and out pipes to generate interrupts on
+ * ACK tokens only (and NYET for the out pipe). The default
+ * configuration also generates an interrupt on the first NACK token.
+ */
+ isp1760_udc_write(udc, DC_INTCONF, DC_CDBGMOD_ACK | DC_DDBGMODIN_ACK |
+ DC_DDBGMODOUT_ACK_NYET);
+
+ isp1760_udc_write(udc, DC_INTENABLE, DC_IEPRXTX(7) | DC_IEPRXTX(6) |
+ DC_IEPRXTX(5) | DC_IEPRXTX(4) | DC_IEPRXTX(3) |
+ DC_IEPRXTX(2) | DC_IEPRXTX(1) | DC_IEPRXTX(0) |
+ DC_IEP0SETUP | DC_IEVBUS | DC_IERESM | DC_IESUSP |
+ DC_IEHS_STA | DC_IEBRST);
+
+ if (udc->connected)
+ isp1760_set_pullup(udc->isp, true);
+
+ isp1760_udc_write(udc, DC_ADDRESS, DC_DEVEN);
+}
+
+static void isp1760_udc_reset(struct isp1760_udc *udc)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ /*
+ * The bus reset has reset most registers to their default value,
+ * reinitialize the UDC hardware.
+ */
+ isp1760_udc_init_hw(udc);
+
+ udc->ep0_state = ISP1760_CTRL_SETUP;
+ udc->gadget.speed = USB_SPEED_FULL;
+
+ usb_gadget_udc_reset(&udc->gadget, udc->driver);
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+}
+
+static void isp1760_udc_suspend(struct isp1760_udc *udc)
+{
+ if (udc->gadget.state < USB_STATE_DEFAULT)
+ return;
+
+ if (udc->driver->suspend)
+ udc->driver->suspend(&udc->gadget);
+}
+
+static void isp1760_udc_resume(struct isp1760_udc *udc)
+{
+ if (udc->gadget.state < USB_STATE_DEFAULT)
+ return;
+
+ if (udc->driver->resume)
+ udc->driver->resume(&udc->gadget);
+}
+
+/* -----------------------------------------------------------------------------
+ * Gadget Operations
+ */
+
+static int isp1760_udc_get_frame(struct usb_gadget *gadget)
+{
+ struct isp1760_udc *udc = gadget_to_udc(gadget);
+
+ return isp1760_udc_read(udc, DC_FRAMENUM) & ((1 << 11) - 1);
+}
+
+static int isp1760_udc_wakeup(struct usb_gadget *gadget)
+{
+ struct isp1760_udc *udc = gadget_to_udc(gadget);
+
+ dev_dbg(udc->isp->dev, "%s\n", __func__);
+ return -ENOTSUPP;
+}
+
+static int isp1760_udc_set_selfpowered(struct usb_gadget *gadget,
+ int is_selfpowered)
+{
+ struct isp1760_udc *udc = gadget_to_udc(gadget);
+
+ if (is_selfpowered)
+ udc->devstatus |= 1 << USB_DEVICE_SELF_POWERED;
+ else
+ udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
+
+ return 0;
+}
+
+static int isp1760_udc_pullup(struct usb_gadget *gadget, int is_on)
+{
+ struct isp1760_udc *udc = gadget_to_udc(gadget);
+
+ isp1760_set_pullup(udc->isp, is_on);
+ udc->connected = is_on;
+
+ return 0;
+}
+
+static int isp1760_udc_start(struct usb_gadget *gadget,
+ struct usb_gadget_driver *driver)
+{
+ struct isp1760_udc *udc = gadget_to_udc(gadget);
+ unsigned long flags;
+
+ /* The hardware doesn't support low speed. */
+ if (driver->max_speed < USB_SPEED_FULL) {
+ dev_err(udc->isp->dev, "Invalid gadget driver\n");
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ if (udc->driver) {
+ dev_err(udc->isp->dev, "UDC already has a gadget driver\n");
+ spin_unlock_irqrestore(&udc->lock, flags);
+ return -EBUSY;
+ }
+
+ udc->driver = driver;
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+
+ dev_dbg(udc->isp->dev, "starting UDC with driver %s\n",
+ driver->function);
+
+ udc->devstatus = 0;
+ udc->connected = true;
+
+ usb_gadget_set_state(&udc->gadget, USB_STATE_ATTACHED);
+
+ /* DMA isn't supported yet, don't enable the DMA clock. */
+ isp1760_udc_write(udc, DC_MODE, DC_GLINTENA);
+
+ isp1760_udc_init_hw(udc);
+
+ dev_dbg(udc->isp->dev, "UDC started with driver %s\n",
+ driver->function);
+
+ return 0;
+}
+
+static int isp1760_udc_stop(struct usb_gadget *gadget)
+{
+ struct isp1760_udc *udc = gadget_to_udc(gadget);
+ unsigned long flags;
+
+ dev_dbg(udc->isp->dev, "%s\n", __func__);
+
+ del_timer_sync(&udc->vbus_timer);
+
+ isp1760_udc_write(udc, DC_MODE, 0);
+
+ spin_lock_irqsave(&udc->lock, flags);
+ udc->driver = NULL;
+ spin_unlock_irqrestore(&udc->lock, flags);
+
+ return 0;
+}
+
+static struct usb_gadget_ops isp1760_udc_ops = {
+ .get_frame = isp1760_udc_get_frame,
+ .wakeup = isp1760_udc_wakeup,
+ .set_selfpowered = isp1760_udc_set_selfpowered,
+ .pullup = isp1760_udc_pullup,
+ .udc_start = isp1760_udc_start,
+ .udc_stop = isp1760_udc_stop,
+};
+
+/* -----------------------------------------------------------------------------
+ * Interrupt Handling
+ */
+
+static irqreturn_t isp1760_udc_irq(int irq, void *dev)
+{
+ struct isp1760_udc *udc = dev;
+ unsigned int i;
+ u32 status;
+
+ status = isp1760_udc_read(udc, DC_INTERRUPT)
+ & isp1760_udc_read(udc, DC_INTENABLE);
+ isp1760_udc_write(udc, DC_INTERRUPT, status);
+
+ if (status & DC_IEVBUS) {
+ dev_dbg(udc->isp->dev, "%s(VBUS)\n", __func__);
+ /* The VBUS interrupt is only triggered when VBUS appears. */
+ spin_lock(&udc->lock);
+ isp1760_udc_connect(udc);
+ spin_unlock(&udc->lock);
+ }
+
+ if (status & DC_IEBRST) {
+ dev_dbg(udc->isp->dev, "%s(BRST)\n", __func__);
+
+ isp1760_udc_reset(udc);
+ }
+
+ for (i = 0; i <= 7; ++i) {
+ struct isp1760_ep *ep = &udc->ep[i*2];
+
+ if (status & DC_IEPTX(i)) {
+ dev_dbg(udc->isp->dev, "%s(EPTX%u)\n", __func__, i);
+ isp1760_ep_tx_complete(ep);
+ }
+
+ if (status & DC_IEPRX(i)) {
+ dev_dbg(udc->isp->dev, "%s(EPRX%u)\n", __func__, i);
+ isp1760_ep_rx_ready(i ? ep - 1 : ep);
+ }
+ }
+
+ if (status & DC_IEP0SETUP) {
+ dev_dbg(udc->isp->dev, "%s(EP0SETUP)\n", __func__);
+
+ isp1760_ep0_setup(udc);
+ }
+
+ if (status & DC_IERESM) {
+ dev_dbg(udc->isp->dev, "%s(RESM)\n", __func__);
+ isp1760_udc_resume(udc);
+ }
+
+ if (status & DC_IESUSP) {
+ dev_dbg(udc->isp->dev, "%s(SUSP)\n", __func__);
+
+ spin_lock(&udc->lock);
+ if (!(isp1760_udc_read(udc, DC_MODE) & DC_VBUSSTAT))
+ isp1760_udc_disconnect(udc);
+ else
+ isp1760_udc_suspend(udc);
+ spin_unlock(&udc->lock);
+ }
+
+ if (status & DC_IEHS_STA) {
+ dev_dbg(udc->isp->dev, "%s(HS_STA)\n", __func__);
+ udc->gadget.speed = USB_SPEED_HIGH;
+ }
+
+ return status ? IRQ_HANDLED : IRQ_NONE;
+}
+
+static void isp1760_udc_vbus_poll(unsigned long data)
+{
+ struct isp1760_udc *udc = (struct isp1760_udc *)data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ if (!(isp1760_udc_read(udc, DC_MODE) & DC_VBUSSTAT))
+ isp1760_udc_disconnect(udc);
+ else if (udc->gadget.state >= USB_STATE_POWERED)
+ mod_timer(&udc->vbus_timer,
+ jiffies + ISP1760_VBUS_POLL_INTERVAL);
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+}
+
+/* -----------------------------------------------------------------------------
+ * Registration
+ */
+
+static void isp1760_udc_init_eps(struct isp1760_udc *udc)
+{
+ unsigned int i;
+
+ INIT_LIST_HEAD(&udc->gadget.ep_list);
+
+ for (i = 0; i < ARRAY_SIZE(udc->ep); ++i) {
+ struct isp1760_ep *ep = &udc->ep[i];
+ unsigned int ep_num = (i + 1) / 2;
+ bool is_in = !(i & 1);
+
+ ep->udc = udc;
+
+ INIT_LIST_HEAD(&ep->queue);
+
+ ep->addr = (ep_num && is_in ? USB_DIR_IN : USB_DIR_OUT)
+ | ep_num;
+ ep->desc = NULL;
+
+ sprintf(ep->name, "ep%u%s", ep_num,
+ ep_num ? (is_in ? "in" : "out") : "");
+
+ ep->ep.ops = &isp1760_ep_ops;
+ ep->ep.name = ep->name;
+
+ /*
+ * Hardcode the maximum packet sizes for now, to 64 bytes for
+ * the control endpoint and 512 bytes for all other endpoints.
+ * This fits in the 8kB FIFO without double-buffering.
+ */
+ if (ep_num == 0) {
+ ep->ep.maxpacket = 64;
+ ep->maxpacket = 64;
+ udc->gadget.ep0 = &ep->ep;
+ } else {
+ ep->ep.maxpacket = 512;
+ ep->maxpacket = 0;
+ list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
+ }
+ }
+}
+
+static int isp1760_udc_init(struct isp1760_udc *udc)
+{
+ u16 scratch;
+ u32 chipid;
+
+ /*
+ * Check that the controller is present by writing to the scratch
+ * register, modifying the bus pattern by reading from the chip ID
+ * register, and reading the scratch register value back. The chip ID
+ * and scratch register contents must match the expected values.
+ */
+ isp1760_udc_write(udc, DC_SCRATCH, 0xbabe);
+ chipid = isp1760_udc_read(udc, DC_CHIPID);
+ scratch = isp1760_udc_read(udc, DC_SCRATCH);
+
+ if (scratch != 0xbabe) {
+ dev_err(udc->isp->dev,
+ "udc: scratch test failed (0x%04x/0x%08x)\n",
+ scratch, chipid);
+ return -ENODEV;
+ }
+
+ if (chipid != 0x00011582 && chipid != 0x00158210) {
+ dev_err(udc->isp->dev, "udc: invalid chip ID 0x%08x\n", chipid);
+ return -ENODEV;
+ }
+
+ /* Reset the device controller. */
+ isp1760_udc_write(udc, DC_MODE, DC_SFRESET);
+ usleep_range(10000, 11000);
+ isp1760_udc_write(udc, DC_MODE, 0);
+ usleep_range(10000, 11000);
+
+ return 0;
+}
+
+int isp1760_udc_register(struct isp1760_device *isp, int irq,
+ unsigned long irqflags)
+{
+ struct isp1760_udc *udc = &isp->udc;
+ const char *devname;
+ int ret;
+
+ udc->irq = -1;
+ udc->isp = isp;
+ udc->regs = isp->regs;
+
+ spin_lock_init(&udc->lock);
+ setup_timer(&udc->vbus_timer, isp1760_udc_vbus_poll,
+ (unsigned long)udc);
+
+ ret = isp1760_udc_init(udc);
+ if (ret < 0)
+ return ret;
+
+ devname = dev_name(isp->dev);
+ udc->irqname = kmalloc(strlen(devname) + 7, GFP_KERNEL);
+ if (!udc->irqname)
+ return -ENOMEM;
+
+ sprintf(udc->irqname, "%s (udc)", devname);
+
+ ret = request_irq(irq, isp1760_udc_irq, IRQF_SHARED | irqflags,
+ udc->irqname, udc);
+ if (ret < 0)
+ goto error;
+
+ udc->irq = irq;
+
+ /*
+ * Initialize the gadget static fields and register its device. Gadget
+ * fields that vary during the life time of the gadget are initialized
+ * by the UDC core.
+ */
+ udc->gadget.ops = &isp1760_udc_ops;
+ udc->gadget.speed = USB_SPEED_UNKNOWN;
+ udc->gadget.max_speed = USB_SPEED_HIGH;
+ udc->gadget.name = "isp1761_udc";
+
+ isp1760_udc_init_eps(udc);
+
+ ret = usb_add_gadget_udc(isp->dev, &udc->gadget);
+ if (ret < 0)
+ goto error;
+
+ return 0;
+
+error:
+ if (udc->irq >= 0)
+ free_irq(udc->irq, udc);
+ kfree(udc->irqname);
+
+ return ret;
+}
+
+void isp1760_udc_unregister(struct isp1760_device *isp)
+{
+ struct isp1760_udc *udc = &isp->udc;
+
+ if (!udc->isp)
+ return;
+
+ usb_del_gadget_udc(&udc->gadget);
+
+ free_irq(udc->irq, udc);
+ kfree(udc->irqname);
+}
Code Review / kvmfornfv.git / blobdiff