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Subject[RFC PATCH v1 08/14] usb:cdns3: EpX operations part of the API
Date
Patch implements callback functions for non-default endpoints
defined in usb_ep_ops object.

Signed-off-by: Pawel Laszczak <pawell@cadence.com>
---
drivers/usb/cdns3/ep0.c | 18 ++
drivers/usb/cdns3/gadget.c | 430 ++++++++++++++++++++++++++++++++++++-
drivers/usb/cdns3/gadget.h | 3 +
3 files changed, 449 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/cdns3/ep0.c b/drivers/usb/cdns3/ep0.c
index c08d02665f9d..ca1795467155 100644
--- a/drivers/usb/cdns3/ep0.c
+++ b/drivers/usb/cdns3/ep0.c
@@ -23,6 +23,24 @@ static void cdns3_prepare_setup_packet(struct cdns3_device *priv_dev)
//TODO: Implements this function
}

+/**
+ * cdns3_gadget_ep_set_wedge Set wedge on selected endpoint
+ * @ep: endpoint object
+ *
+ * Returns 0
+ */
+int cdns3_gadget_ep_set_wedge(struct usb_ep *ep)
+{
+ struct cdns3_endpoint *priv_ep = ep_to_cdns3_ep(ep);
+ struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+
+ dev_dbg(&priv_dev->dev, "Wedge for %s\n", ep->name);
+ cdns3_gadget_ep_set_halt(ep, 1);
+ priv_ep->flags |= EP_WEDGE;
+
+ return 0;
+}
+
/**
* cdns3_ep0_config - Configures default endpoint
* @priv_dev: extended gadget object
diff --git a/drivers/usb/cdns3/gadget.c b/drivers/usb/cdns3/gadget.c
index ff8306ac070e..b08e0836f9a5 100644
--- a/drivers/usb/cdns3/gadget.c
+++ b/drivers/usb/cdns3/gadget.c
@@ -58,6 +58,19 @@ void cdns3_set_register_bit(void __iomem *ptr, u32 mask)
writel(mask, ptr);
}

+/**
+ * cdns3_next_request - returns next request from list
+ * @list: list containing requests
+ *
+ * Returns request or NULL if no requests in list
+ */
+struct usb_request *cdns3_next_request(struct list_head *list)
+{
+ if (list_empty(list))
+ return NULL;
+ return list_first_entry(list, struct usb_request, list);
+}
+
/**
* select_ep - selects endpoint
* @priv_dev: extended gadget object
@@ -75,6 +88,46 @@ void cdns3_select_ep(struct cdns3_device *priv_dev, u32 ep)
wmb();
}

+/**
+ * cdns3_allocate_trb_pool - Allocates TRB's pool for selected endpoint
+ * @priv_ep: endpoint object
+ *
+ * Function will return 0 on success or -ENOMEM on allocation error
+ */
+static int cdns3_allocate_trb_pool(struct cdns3_endpoint *priv_ep)
+{
+ struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+ struct cdns3_trb *link_trb;
+
+ priv_ep->trb_pool = dma_zalloc_coherent(priv_dev->sysdev,
+ TRB_SIZE * TRBS_PER_SEGMENT,
+ &priv_ep->trb_pool_dma,
+ GFP_DMA);
+ if (!priv_ep->trb_pool)
+ return -ENOMEM;
+
+ priv_ep->aligned_buff = dma_alloc_coherent(priv_dev->sysdev,
+ CDNS3_UNALIGNED_BUF_SIZE,
+ &priv_ep->aligned_dma_addr,
+ GFP_DMA);
+ if (!priv_ep->aligned_buff) {
+ dma_free_coherent(priv_dev->sysdev,
+ TRB_SIZE * TRBS_PER_SEGMENT,
+ priv_ep->trb_pool, priv_ep->trb_pool_dma);
+ priv_ep->trb_pool = NULL;
+
+ return -ENOMEM;
+ }
+
+ /* Initialize the last TRB as Link TRB */
+ link_trb = (priv_ep->trb_pool + TRBS_PER_SEGMENT - 1);
+ link_trb->buffer = TRB_BUFFER(priv_ep->trb_pool_dma);
+ link_trb->control = TRB_CYCLE | TRB_TYPE(TRB_LINK) |
+ TRB_CHAIN | TRB_TOGGLE;
+
+ return 0;
+}
+
static void cdns3_free_trb_pool(struct cdns3_endpoint *priv_ep)
{
struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
@@ -89,6 +142,73 @@ static void cdns3_free_trb_pool(struct cdns3_endpoint *priv_ep)
priv_ep->aligned_buff = NULL;
}

+/**
+ * cdns3_data_flush - flush data at onchip buffer
+ * @priv_ep: endpoint object
+ *
+ * Endpoint must be selected before call to this function
+ *
+ * Returns zero on success or negative value on failure
+ */
+static int cdns3_data_flush(struct cdns3_endpoint *priv_ep)
+{
+ struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+
+ writel(EP_CMD_DFLUSH, &priv_dev->regs->ep_cmd);
+
+ /* wait for DFLUSH cleared */
+ return cdns3_handshake(&priv_dev->regs->ep_cmd, EP_CMD_DFLUSH, 0, 100);
+}
+
+/**
+ * cdns3_ep_stall_flush - Stalls and flushes selected endpoint
+ * @priv_ep: endpoint object
+ *
+ * Endpoint must be selected before call to this function
+ */
+static void cdns3_ep_stall_flush(struct cdns3_endpoint *priv_ep)
+{
+ struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+
+ writel(EP_CMD_DFLUSH | EP_CMD_ERDY | EP_CMD_SSTALL,
+ &priv_dev->regs->ep_cmd);
+
+ /* wait for DFLUSH cleared */
+ cdns3_handshake(&priv_dev->regs->ep_cmd, EP_CMD_DFLUSH, 0, 100);
+ priv_ep->flags |= EP_STALL;
+}
+
+/**
+ * cdns3_gadget_giveback - call struct usb_request's ->complete callback
+ * @priv_ep: The endpoint to whom the request belongs to
+ * @priv_req: The request we're giving back
+ * @status: completion code for the request
+ *
+ * Must be called with controller's lock held and interrupts disabled. This
+ * function will unmap @req and call its ->complete() callback to notify upper
+ * layers that it has completed.
+ */
+void cdns3_gadget_giveback(struct cdns3_endpoint *priv_ep,
+ struct cdns3_request *priv_req,
+ int status)
+{
+ //TODO: Implements this function.
+}
+
+/**
+ * cdns3_ep_run_transfer - start transfer on no-default endpoint hardware
+ * @priv_ep: endpoint object
+ *
+ * Returns zero on success or negative value on failure
+ */
+int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
+ struct usb_request *request)
+{
+ //TODO: Implements this function.
+
+ return 0;
+}
+
/**
* cdns3_irq_handler - irq line interrupt handler
* @cdns: cdns3 instance
@@ -167,6 +287,313 @@ static struct usb_ep *cdns3_gadget_match_ep(struct usb_gadget *gadget,
return &priv_ep->endpoint;
}

+/**
+ * cdns3_gadget_ep_enable Enable endpoint
+ * @ep: endpoint object
+ * @desc: endpoint descriptor
+ *
+ * Returns 0 on success, error code elsewhere
+ */
+static int cdns3_gadget_ep_enable(struct usb_ep *ep,
+ const struct usb_endpoint_descriptor *desc)
+{
+ struct cdns3_endpoint *priv_ep;
+ struct cdns3_device *priv_dev;
+ unsigned long flags;
+ int ret;
+
+ priv_ep = ep_to_cdns3_ep(ep);
+ priv_dev = priv_ep->cdns3_dev;
+
+ if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
+ dev_err(&priv_dev->dev, "usbss: invalid parameters\n");
+ return -EINVAL;
+ }
+
+ if (!desc->wMaxPacketSize) {
+ dev_err(&priv_dev->dev, "usbss: missing wMaxPacketSize\n");
+ return -EINVAL;
+ }
+
+ if (dev_WARN_ONCE(&priv_dev->dev, priv_ep->flags & EP_ENABLED,
+ "%s is already enabled\n", priv_ep->name))
+ return 0;
+
+ ret = cdns3_allocate_trb_pool(priv_ep);
+ if (ret)
+ return ret;
+
+ dev_dbg(&priv_dev->dev, "Enabling endpoint: %s\n", ep->name);
+ spin_lock_irqsave(&priv_dev->lock, flags);
+ cdns3_select_ep(priv_dev, desc->bEndpointAddress);
+ writel(EP_CMD_EPRST, &priv_dev->regs->ep_cmd);
+
+ ret = cdns3_handshake(&priv_dev->regs->ep_cmd,
+ EP_CMD_EPRST, 0, 100);
+
+ cdns3_set_register_bit(&priv_dev->regs->ep_cfg, EP_CFG_ENABLE);
+
+ ep->desc = desc;
+ priv_ep->flags &= ~(EP_PENDING_REQUEST | EP_STALL);
+ priv_ep->flags |= EP_ENABLED | EP_UPDATE_EP_TRBADDR;
+ priv_ep->enqueue = 0;
+ priv_ep->dequeue = 0;
+ priv_ep->pcs = 1;
+ priv_ep->ccs = 1;
+ /* one TRB is reserved for link TRB used in DMULT mode*/
+ priv_ep->free_trbs = TRBS_PER_SEGMENT - 1;
+
+ spin_unlock_irqrestore(&priv_dev->lock, flags);
+ return 0;
+}
+
+/**
+ * cdns3_gadget_ep_disable Disable endpoint
+ * @ep: endpoint object
+ *
+ * Returns 0 on success, error code elsewhere
+ */
+static int cdns3_gadget_ep_disable(struct usb_ep *ep)
+{
+ struct cdns3_endpoint *priv_ep;
+ struct cdns3_device *priv_dev;
+ unsigned long flags;
+ int ret = 0;
+ struct usb_request *request;
+ u32 ep_cfg;
+
+ if (!ep) {
+ pr_debug("usbss: invalid parameters\n");
+ return -EINVAL;
+ }
+
+ priv_ep = ep_to_cdns3_ep(ep);
+ priv_dev = priv_ep->cdns3_dev;
+
+ if (dev_WARN_ONCE(&priv_dev->dev, !(priv_ep->flags & EP_ENABLED),
+ "%s is already disabled\n", priv_ep->name))
+ return 0;
+
+ spin_lock_irqsave(&priv_dev->lock, flags);
+ if (!priv_dev->start_gadget) {
+ dev_dbg(&priv_dev->dev,
+ "Disabling endpoint at disconnection: %s\n", ep->name);
+ spin_unlock_irqrestore(&priv_dev->lock, flags);
+ return 0;
+ }
+
+ dev_dbg(&priv_dev->dev, "Disabling endpoint: %s\n", ep->name);
+
+ cdns3_select_ep(priv_dev, ep->desc->bEndpointAddress);
+ ret = cdns3_data_flush(priv_ep);
+ while (!list_empty(&priv_ep->request_list)) {
+ request = cdns3_next_request(&priv_ep->request_list);
+
+ cdns3_gadget_giveback(priv_ep, to_cdns3_request(request),
+ -ESHUTDOWN);
+ }
+
+ ep_cfg = readl(&priv_dev->regs->ep_cfg);
+ ep_cfg &= ~EP_CFG_ENABLE;
+ writel(ep_cfg, &priv_dev->regs->ep_cfg);
+ ep->desc = NULL;
+ priv_ep->flags &= ~EP_ENABLED;
+
+ spin_unlock_irqrestore(&priv_dev->lock, flags);
+
+ return ret;
+}
+
+/**
+ * cdns3_gadget_ep_alloc_request Allocates request
+ * @ep: endpoint object associated with request
+ * @gfp_flags: gfp flags
+ *
+ * Returns allocated request address, NULL on allocation error
+ */
+struct usb_request *cdns3_gadget_ep_alloc_request(struct usb_ep *ep,
+ gfp_t gfp_flags)
+{
+ struct cdns3_request *priv_req;
+
+ priv_req = kzalloc(sizeof(*priv_req), gfp_flags);
+ if (!priv_req)
+ return NULL;
+
+ return &priv_req->request;
+}
+
+/**
+ * cdns3_gadget_ep_free_request Free memory occupied by request
+ * @ep: endpoint object associated with request
+ * @request: request to free memory
+ */
+void cdns3_gadget_ep_free_request(struct usb_ep *ep,
+ struct usb_request *request)
+{
+ struct cdns3_request *priv_req = to_cdns3_request(request);
+
+ kfree(priv_req);
+}
+
+/**
+ * cdns3_gadget_ep_queue Transfer data on endpoint
+ * @ep: endpoint object
+ * @request: request object
+ * @gfp_flags: gfp flags
+ *
+ * Returns 0 on success, error code elsewhere
+ */
+static int __cdns3_gadget_ep_queue(struct usb_ep *ep,
+ struct usb_request *request,
+ gfp_t gfp_flags)
+{
+ struct cdns3_endpoint *priv_ep = ep_to_cdns3_ep(ep);
+ struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+ int ret = 0;
+
+ request->actual = 0;
+ request->status = -EINPROGRESS;
+
+ dev_dbg(&priv_dev->dev, "Queuing to endpoint: %s\n", priv_ep->name);
+
+ ret = usb_gadget_map_request_by_dev(priv_dev->sysdev, request,
+ usb_endpoint_dir_in(ep->desc));
+
+ if (ret)
+ return ret;
+
+ if (!cdns3_ep_run_transfer(priv_ep, request))
+ list_add_tail(&request->list, &priv_ep->request_list);
+
+ return ret;
+}
+
+static int cdns3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,
+ gfp_t gfp_flags)
+{
+ struct cdns3_endpoint *priv_ep = ep_to_cdns3_ep(ep);
+ struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+ struct usb_request *zlp_request;
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&priv_dev->lock, flags);
+ ret = __cdns3_gadget_ep_queue(ep, request, gfp_flags);
+
+ if (ret == 0 && request->zero && request->length &&
+ (request->length % ep->maxpacket == 0)) {
+ zlp_request = cdns3_gadget_ep_alloc_request(ep, GFP_ATOMIC);
+ zlp_request->buf = priv_dev->zlp_buf;
+ zlp_request->length = 0;
+
+ dev_dbg(&priv_dev->dev, "Queuing ZLP for endpoint: %s\n",
+ priv_ep->name);
+ ret = __cdns3_gadget_ep_queue(ep, zlp_request, gfp_flags);
+ }
+
+ spin_unlock_irqrestore(&priv_dev->lock, flags);
+ return ret;
+}
+
+/**
+ * cdns3_gadget_ep_dequeue Remove request from transfer queue
+ * @ep: endpoint object associated with request
+ * @request: request object
+ *
+ * Returns 0 on success, error code elsewhere
+ */
+int cdns3_gadget_ep_dequeue(struct usb_ep *ep,
+ struct usb_request *request)
+{
+ struct cdns3_endpoint *priv_ep = ep_to_cdns3_ep(ep);
+ struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+ struct usb_request *req, *req_temp;
+ unsigned long flags;
+ int ret = 0;
+
+ if (!ep || !request || !ep->desc)
+ return -EINVAL;
+
+ spin_lock_irqsave(&priv_dev->lock, flags);
+ dev_dbg(&priv_dev->dev, "Dequeue from %s\n", ep->name);
+
+ cdns3_select_ep(priv_dev, ep->desc->bEndpointAddress);
+ if (priv_dev->start_gadget)
+ ret = cdns3_data_flush(priv_ep);
+
+ list_for_each_entry_safe(req, req_temp, &priv_ep->request_list, list) {
+ if (request == req) {
+ cdns3_gadget_giveback(priv_ep,
+ to_cdns3_request(request),
+ -ECONNRESET);
+ break;
+ }
+ }
+
+ spin_unlock_irqrestore(&priv_dev->lock, flags);
+ return ret;
+}
+
+/**
+ * cdns3_gadget_ep_set_halt Sets/clears stall on selected endpoint
+ * @ep: endpoint object to set/clear stall on
+ * @value: 1 for set stall, 0 for clear stall
+ *
+ * Returns 0 on success, error code elsewhere
+ */
+int cdns3_gadget_ep_set_halt(struct usb_ep *ep, int value)
+{
+ struct cdns3_endpoint *priv_ep = ep_to_cdns3_ep(ep);
+ struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+ unsigned long flags;
+ int ret = 0;
+
+ if (!(priv_ep->flags & EP_ENABLED))
+ return -EPERM;
+
+ /* if actual transfer is pending defer setting stall on this endpoint */
+ if ((priv_ep->flags & EP_PENDING_REQUEST) && value) {
+ priv_ep->flags |= EP_STALL;
+ return 0;
+ }
+
+ dev_dbg(&priv_dev->dev, "Halt endpoint %s\n", priv_ep->name);
+
+ spin_lock_irqsave(&priv_dev->lock, flags);
+
+ cdns3_select_ep(priv_dev, ep->desc->bEndpointAddress);
+ if (value) {
+ cdns3_ep_stall_flush(priv_ep);
+ } else {
+ priv_ep->flags &= ~EP_WEDGE;
+ writel(EP_CMD_CSTALL | EP_CMD_EPRST, &priv_dev->regs->ep_cmd);
+
+ /* wait for EPRST cleared */
+ ret = cdns3_handshake(&priv_dev->regs->ep_cmd,
+ EP_CMD_EPRST, 0, 100);
+ priv_ep->flags &= ~EP_STALL;
+ }
+
+ priv_ep->flags &= ~EP_PENDING_REQUEST;
+ spin_unlock_irqrestore(&priv_dev->lock, flags);
+
+ return ret;
+}
+
+extern const struct usb_ep_ops cdns3_gadget_ep0_ops;
+
+static const struct usb_ep_ops cdns3_gadget_ep_ops = {
+ .enable = cdns3_gadget_ep_enable,
+ .disable = cdns3_gadget_ep_disable,
+ .alloc_request = cdns3_gadget_ep_alloc_request,
+ .free_request = cdns3_gadget_ep_free_request,
+ .queue = cdns3_gadget_ep_queue,
+ .dequeue = cdns3_gadget_ep_dequeue,
+ .set_halt = cdns3_gadget_ep_set_halt,
+ .set_wedge = cdns3_gadget_ep_set_wedge,
+};
+
/**
* cdns3_gadget_get_frame Returns number of actual ITP frame
* @gadget: gadget object
@@ -363,8 +790,7 @@ static int cdns3_init_ep(struct cdns3_device *priv_dev)
usb_ep_set_maxpacket_limit(&priv_ep->endpoint,
ENDPOINT_MAX_PACKET_LIMIT);
priv_ep->endpoint.max_streams = ENDPOINT_MAX_STREAMS;
- //TODO: Add implementation of cdns3_gadget_ep_ops
- //priv_ep->endpoint.ops = &cdns3_gadget_ep_ops;
+ priv_ep->endpoint.ops = &cdns3_gadget_ep_ops;
if (ep_dir)
priv_ep->endpoint.caps.dir_in = 1;
else
diff --git a/drivers/usb/cdns3/gadget.h b/drivers/usb/cdns3/gadget.h
index b57e863017b0..3930613aadda 100644
--- a/drivers/usb/cdns3/gadget.h
+++ b/drivers/usb/cdns3/gadget.h
@@ -1068,4 +1068,7 @@ void cdns3_set_register_bit(void __iomem *ptr, u32 mask);
int cdns3_init_ep0(struct cdns3_device *priv_dev);
void cdns3_ep0_config(struct cdns3_device *priv_dev);
void cdns3_select_ep(struct cdns3_device *priv_dev, u32 ep);
+int cdns3_gadget_ep_set_wedge(struct usb_ep *ep);
+int cdns3_gadget_ep_set_halt(struct usb_ep *ep, int value);
+
#endif /* __LINUX_CDNS3_GADGET */
--
2.17.1
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