summaryrefslogtreecommitdiff
path: root/drivers/usb/cdns3/gadget.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/usb/cdns3/gadget.c')
-rw-r--r--drivers/usb/cdns3/gadget.c2744
1 files changed, 2744 insertions, 0 deletions
diff --git a/drivers/usb/cdns3/gadget.c b/drivers/usb/cdns3/gadget.c
new file mode 100644
index 000000000000..228cdc4ab886
--- /dev/null
+++ b/drivers/usb/cdns3/gadget.c
@@ -0,0 +1,2744 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Cadence USBSS DRD Driver - gadget side.
+ *
+ * Copyright (C) 2018-2019 Cadence Design Systems.
+ * Copyright (C) 2017-2018 NXP
+ *
+ * Authors: Pawel Jez <pjez@cadence.com>,
+ * Pawel Laszczak <pawell@cadence.com>
+ * Peter Chen <peter.chen@nxp.com>
+ */
+
+/*
+ * Work around 1:
+ * At some situations, the controller may get stale data address in TRB
+ * at below sequences:
+ * 1. Controller read TRB includes data address
+ * 2. Software updates TRBs includes data address and Cycle bit
+ * 3. Controller read TRB which includes Cycle bit
+ * 4. DMA run with stale data address
+ *
+ * To fix this problem, driver needs to make the first TRB in TD as invalid.
+ * After preparing all TRBs driver needs to check the position of DMA and
+ * if the DMA point to the first just added TRB and doorbell is 1,
+ * then driver must defer making this TRB as valid. This TRB will be make
+ * as valid during adding next TRB only if DMA is stopped or at TRBERR
+ * interrupt.
+ *
+ * Issue has been fixed in DEV_VER_V3 version of controller.
+ *
+ * Work around 2:
+ * Controller for OUT endpoints has shared on-chip buffers for all incoming
+ * packets, including ep0out. It's FIFO buffer, so packets must be handle by DMA
+ * in correct order. If the first packet in the buffer will not be handled,
+ * then the following packets directed for other endpoints and functions
+ * will be blocked.
+ * Additionally the packets directed to one endpoint can block entire on-chip
+ * buffers. In this case transfer to other endpoints also will blocked.
+ *
+ * To resolve this issue after raising the descriptor missing interrupt
+ * driver prepares internal usb_request object and use it to arm DMA transfer.
+ *
+ * The problematic situation was observed in case when endpoint has been enabled
+ * but no usb_request were queued. Driver try detects such endpoints and will
+ * use this workaround only for these endpoint.
+ *
+ * Driver use limited number of buffer. This number can be set by macro
+ * CDNS3_WA2_NUM_BUFFERS.
+ *
+ * Such blocking situation was observed on ACM gadget. For this function
+ * host send OUT data packet but ACM function is not prepared for this packet.
+ * It's cause that buffer placed in on chip memory block transfer to other
+ * endpoints.
+ *
+ * Issue has been fixed in DEV_VER_V2 version of controller.
+ *
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/usb/gadget.h>
+#include <linux/module.h>
+#include <linux/iopoll.h>
+
+#include "core.h"
+#include "gadget-export.h"
+#include "gadget.h"
+#include "trace.h"
+#include "drd.h"
+
+static int __cdns3_gadget_ep_queue(struct usb_ep *ep,
+ struct usb_request *request,
+ gfp_t gfp_flags);
+
+/**
+ * cdns3_set_register_bit - set bit in given register.
+ * @ptr: address of device controller register to be read and changed
+ * @mask: bits requested to set
+ */
+void cdns3_set_register_bit(void __iomem *ptr, u32 mask)
+{
+ mask = readl(ptr) | mask;
+ writel(mask, ptr);
+}
+
+/**
+ * cdns3_ep_addr_to_index - Macro converts endpoint address to
+ * index of endpoint object in cdns3_device.eps[] container
+ * @ep_addr: endpoint address for which endpoint object is required
+ *
+ */
+u8 cdns3_ep_addr_to_index(u8 ep_addr)
+{
+ return (((ep_addr & 0x7F)) + ((ep_addr & USB_DIR_IN) ? 16 : 0));
+}
+
+static int cdns3_get_dma_pos(struct cdns3_device *priv_dev,
+ struct cdns3_endpoint *priv_ep)
+{
+ int dma_index;
+
+ dma_index = readl(&priv_dev->regs->ep_traddr) - priv_ep->trb_pool_dma;
+
+ return dma_index / TRB_SIZE;
+}
+
+/**
+ * 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)
+{
+ return list_first_entry_or_null(list, struct usb_request, list);
+}
+
+/**
+ * cdns3_next_align_buf - returns next buffer from list
+ * @list: list containing buffers
+ *
+ * Returns buffer or NULL if no buffers in list
+ */
+struct cdns3_aligned_buf *cdns3_next_align_buf(struct list_head *list)
+{
+ return list_first_entry_or_null(list, struct cdns3_aligned_buf, list);
+}
+
+/**
+ * cdns3_next_priv_request - returns next request from list
+ * @list: list containing requests
+ *
+ * Returns request or NULL if no requests in list
+ */
+struct cdns3_request *cdns3_next_priv_request(struct list_head *list)
+{
+ return list_first_entry_or_null(list, struct cdns3_request, list);
+}
+
+/**
+ * select_ep - selects endpoint
+ * @priv_dev: extended gadget object
+ * @ep: endpoint address
+ */
+void cdns3_select_ep(struct cdns3_device *priv_dev, u32 ep)
+{
+ if (priv_dev->selected_ep == ep)
+ return;
+
+ priv_dev->selected_ep = ep;
+ writel(ep, &priv_dev->regs->ep_sel);
+}
+
+dma_addr_t cdns3_trb_virt_to_dma(struct cdns3_endpoint *priv_ep,
+ struct cdns3_trb *trb)
+{
+ u32 offset = (char *)trb - (char *)priv_ep->trb_pool;
+
+ return priv_ep->trb_pool_dma + offset;
+}
+
+int cdns3_ring_size(struct cdns3_endpoint *priv_ep)
+{
+ switch (priv_ep->type) {
+ case USB_ENDPOINT_XFER_ISOC:
+ return TRB_ISO_RING_SIZE;
+ case USB_ENDPOINT_XFER_CONTROL:
+ return TRB_CTRL_RING_SIZE;
+ default:
+ return TRB_RING_SIZE;
+ }
+}
+
+/**
+ * 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
+ */
+int cdns3_allocate_trb_pool(struct cdns3_endpoint *priv_ep)
+{
+ struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+ int ring_size = cdns3_ring_size(priv_ep);
+ struct cdns3_trb *link_trb;
+
+ if (!priv_ep->trb_pool) {
+ priv_ep->trb_pool = dma_alloc_coherent(priv_dev->sysdev,
+ ring_size,
+ &priv_ep->trb_pool_dma,
+ GFP_DMA32 | GFP_ATOMIC);
+ if (!priv_ep->trb_pool)
+ return -ENOMEM;
+ } else {
+ memset(priv_ep->trb_pool, 0, ring_size);
+ }
+
+ if (!priv_ep->num)
+ return 0;
+
+ priv_ep->num_trbs = ring_size / TRB_SIZE;
+ /* Initialize the last TRB as Link TRB. */
+ link_trb = (priv_ep->trb_pool + (priv_ep->num_trbs - 1));
+ link_trb->buffer = TRB_BUFFER(priv_ep->trb_pool_dma);
+ link_trb->control = TRB_CYCLE | TRB_TYPE(TRB_LINK) | TRB_TOGGLE;
+
+ return 0;
+}
+
+static void cdns3_free_trb_pool(struct cdns3_endpoint *priv_ep)
+{
+ struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+
+ if (priv_ep->trb_pool) {
+ dma_free_coherent(priv_dev->sysdev,
+ cdns3_ring_size(priv_ep),
+ priv_ep->trb_pool, priv_ep->trb_pool_dma);
+ priv_ep->trb_pool = NULL;
+ }
+}
+
+/**
+ * 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;
+ int val;
+
+ trace_cdns3_halt(priv_ep, 1, 1);
+
+ writel(EP_CMD_DFLUSH | EP_CMD_ERDY | EP_CMD_SSTALL,
+ &priv_dev->regs->ep_cmd);
+
+ /* wait for DFLUSH cleared */
+ readl_poll_timeout_atomic(&priv_dev->regs->ep_cmd, val,
+ !(val & EP_CMD_DFLUSH), 1, 1000);
+ priv_ep->flags |= EP_STALLED;
+ priv_ep->flags &= ~EP_STALL_PENDING;
+}
+
+/**
+ * cdns3_hw_reset_eps_config - reset endpoints configuration kept by controller.
+ * @priv_dev: extended gadget object
+ */
+void cdns3_hw_reset_eps_config(struct cdns3_device *priv_dev)
+{
+ writel(USB_CONF_CFGRST, &priv_dev->regs->usb_conf);
+
+ cdns3_allow_enable_l1(priv_dev, 0);
+ priv_dev->hw_configured_flag = 0;
+ priv_dev->onchip_used_size = 0;
+ priv_dev->out_mem_is_allocated = 0;
+ priv_dev->wait_for_setup = 0;
+}
+
+/**
+ * cdns3_ep_inc_trb - increment a trb index.
+ * @index: Pointer to the TRB index to increment.
+ * @cs: Cycle state
+ * @trb_in_seg: number of TRBs in segment
+ *
+ * The index should never point to the link TRB. After incrementing,
+ * if it is point to the link TRB, wrap around to the beginning and revert
+ * cycle state bit The
+ * link TRB is always at the last TRB entry.
+ */
+static void cdns3_ep_inc_trb(int *index, u8 *cs, int trb_in_seg)
+{
+ (*index)++;
+ if (*index == (trb_in_seg - 1)) {
+ *index = 0;
+ *cs ^= 1;
+ }
+}
+
+/**
+ * cdns3_ep_inc_enq - increment endpoint's enqueue pointer
+ * @priv_ep: The endpoint whose enqueue pointer we're incrementing
+ */
+static void cdns3_ep_inc_enq(struct cdns3_endpoint *priv_ep)
+{
+ priv_ep->free_trbs--;
+ cdns3_ep_inc_trb(&priv_ep->enqueue, &priv_ep->pcs, priv_ep->num_trbs);
+}
+
+/**
+ * cdns3_ep_inc_deq - increment endpoint's dequeue pointer
+ * @priv_ep: The endpoint whose dequeue pointer we're incrementing
+ */
+static void cdns3_ep_inc_deq(struct cdns3_endpoint *priv_ep)
+{
+ priv_ep->free_trbs++;
+ cdns3_ep_inc_trb(&priv_ep->dequeue, &priv_ep->ccs, priv_ep->num_trbs);
+}
+
+void cdns3_move_deq_to_next_trb(struct cdns3_request *priv_req)
+{
+ struct cdns3_endpoint *priv_ep = priv_req->priv_ep;
+ int current_trb = priv_req->start_trb;
+
+ while (current_trb != priv_req->end_trb) {
+ cdns3_ep_inc_deq(priv_ep);
+ current_trb = priv_ep->dequeue;
+ }
+
+ cdns3_ep_inc_deq(priv_ep);
+}
+
+/**
+ * cdns3_allow_enable_l1 - enable/disable permits to transition to L1.
+ * @priv_dev: Extended gadget object
+ * @enable: Enable/disable permit to transition to L1.
+ *
+ * If bit USB_CONF_L1EN is set and device receive Extended Token packet,
+ * then controller answer with ACK handshake.
+ * If bit USB_CONF_L1DS is set and device receive Extended Token packet,
+ * then controller answer with NYET handshake.
+ */
+void cdns3_allow_enable_l1(struct cdns3_device *priv_dev, int enable)
+{
+ if (enable)
+ writel(USB_CONF_L1EN, &priv_dev->regs->usb_conf);
+ else
+ writel(USB_CONF_L1DS, &priv_dev->regs->usb_conf);
+}
+
+enum usb_device_speed cdns3_get_speed(struct cdns3_device *priv_dev)
+{
+ u32 reg;
+
+ reg = readl(&priv_dev->regs->usb_sts);
+
+ if (DEV_SUPERSPEED(reg))
+ return USB_SPEED_SUPER;
+ else if (DEV_HIGHSPEED(reg))
+ return USB_SPEED_HIGH;
+ else if (DEV_FULLSPEED(reg))
+ return USB_SPEED_FULL;
+ else if (DEV_LOWSPEED(reg))
+ return USB_SPEED_LOW;
+ return USB_SPEED_UNKNOWN;
+}
+
+/**
+ * cdns3_start_all_request - add to ring all request not started
+ * @priv_dev: Extended gadget object
+ * @priv_ep: The endpoint for whom request will be started.
+ *
+ * Returns return ENOMEM if transfer ring i not enough TRBs to start
+ * all requests.
+ */
+static int cdns3_start_all_request(struct cdns3_device *priv_dev,
+ struct cdns3_endpoint *priv_ep)
+{
+ struct usb_request *request;
+ int ret = 0;
+
+ while (!list_empty(&priv_ep->deferred_req_list)) {
+ request = cdns3_next_request(&priv_ep->deferred_req_list);
+
+ ret = cdns3_ep_run_transfer(priv_ep, request);
+ if (ret)
+ return ret;
+
+ list_del(&request->list);
+ list_add_tail(&request->list,
+ &priv_ep->pending_req_list);
+ }
+
+ priv_ep->flags &= ~EP_RING_FULL;
+ return ret;
+}
+
+/*
+ * WA2: Set flag for all not ISOC OUT endpoints. If this flag is set
+ * driver try to detect whether endpoint need additional internal
+ * buffer for unblocking on-chip FIFO buffer. This flag will be cleared
+ * if before first DESCMISS interrupt the DMA will be armed.
+ */
+#define cdns3_wa2_enable_detection(priv_dev, ep_priv, reg) do { \
+ if (!priv_ep->dir && priv_ep->type != USB_ENDPOINT_XFER_ISOC) { \
+ priv_ep->flags |= EP_QUIRK_EXTRA_BUF_DET; \
+ (reg) |= EP_STS_EN_DESCMISEN; \
+ } } while (0)
+
+/**
+ * cdns3_wa2_descmiss_copy_data copy data from internal requests to
+ * request queued by class driver.
+ * @priv_ep: extended endpoint object
+ * @request: request object
+ */
+static void cdns3_wa2_descmiss_copy_data(struct cdns3_endpoint *priv_ep,
+ struct usb_request *request)
+{
+ struct usb_request *descmiss_req;
+ struct cdns3_request *descmiss_priv_req;
+
+ while (!list_empty(&priv_ep->wa2_descmiss_req_list)) {
+ int chunk_end;
+ int length;
+
+ descmiss_priv_req =
+ cdns3_next_priv_request(&priv_ep->wa2_descmiss_req_list);
+ descmiss_req = &descmiss_priv_req->request;
+
+ /* driver can't touch pending request */
+ if (descmiss_priv_req->flags & REQUEST_PENDING)
+ break;
+
+ chunk_end = descmiss_priv_req->flags & REQUEST_INTERNAL_CH;
+ length = request->actual + descmiss_req->actual;
+
+ request->status = descmiss_req->status;
+
+ if (length <= request->length) {
+ memcpy(&((u8 *)request->buf)[request->actual],
+ descmiss_req->buf,
+ descmiss_req->actual);
+ request->actual = length;
+ } else {
+ /* It should never occures */
+ request->status = -ENOMEM;
+ }
+
+ list_del_init(&descmiss_priv_req->list);
+
+ kfree(descmiss_req->buf);
+ cdns3_gadget_ep_free_request(&priv_ep->endpoint, descmiss_req);
+ --priv_ep->wa2_counter;
+
+ if (!chunk_end)
+ break;
+ }
+}
+
+struct usb_request *cdns3_wa2_gadget_giveback(struct cdns3_device *priv_dev,
+ struct cdns3_endpoint *priv_ep,
+ struct cdns3_request *priv_req)
+{
+ if (priv_ep->flags & EP_QUIRK_EXTRA_BUF_EN &&
+ priv_req->flags & REQUEST_INTERNAL) {
+ struct usb_request *req;
+
+ req = cdns3_next_request(&priv_ep->deferred_req_list);
+
+ priv_ep->descmis_req = NULL;
+
+ if (!req)
+ return NULL;
+
+ cdns3_wa2_descmiss_copy_data(priv_ep, req);
+ if (!(priv_ep->flags & EP_QUIRK_END_TRANSFER) &&
+ req->length != req->actual) {
+ /* wait for next part of transfer */
+ return NULL;
+ }
+
+ if (req->status == -EINPROGRESS)
+ req->status = 0;
+
+ list_del_init(&req->list);
+ cdns3_start_all_request(priv_dev, priv_ep);
+ return req;
+ }
+
+ return &priv_req->request;
+}
+
+int cdns3_wa2_gadget_ep_queue(struct cdns3_device *priv_dev,
+ struct cdns3_endpoint *priv_ep,
+ struct cdns3_request *priv_req)
+{
+ int deferred = 0;
+
+ /*
+ * If transfer was queued before DESCMISS appear than we
+ * can disable handling of DESCMISS interrupt. Driver assumes that it
+ * can disable special treatment for this endpoint.
+ */
+ if (priv_ep->flags & EP_QUIRK_EXTRA_BUF_DET) {
+ u32 reg;
+
+ cdns3_select_ep(priv_dev, priv_ep->num | priv_ep->dir);
+ priv_ep->flags &= ~EP_QUIRK_EXTRA_BUF_DET;
+ reg = readl(&priv_dev->regs->ep_sts_en);
+ reg &= ~EP_STS_EN_DESCMISEN;
+ trace_cdns3_wa2(priv_ep, "workaround disabled\n");
+ writel(reg, &priv_dev->regs->ep_sts_en);
+ }
+
+ if (priv_ep->flags & EP_QUIRK_EXTRA_BUF_EN) {
+ u8 pending_empty = list_empty(&priv_ep->pending_req_list);
+ u8 descmiss_empty = list_empty(&priv_ep->wa2_descmiss_req_list);
+
+ /*
+ * DESCMISS transfer has been finished, so data will be
+ * directly copied from internal allocated usb_request
+ * objects.
+ */
+ if (pending_empty && !descmiss_empty &&
+ !(priv_req->flags & REQUEST_INTERNAL)) {
+ cdns3_wa2_descmiss_copy_data(priv_ep,
+ &priv_req->request);
+
+ trace_cdns3_wa2(priv_ep, "get internal stored data");
+
+ list_add_tail(&priv_req->request.list,
+ &priv_ep->pending_req_list);
+ cdns3_gadget_giveback(priv_ep, priv_req,
+ priv_req->request.status);
+
+ /*
+ * Intentionally driver returns positive value as
+ * correct value. It informs that transfer has
+ * been finished.
+ */
+ return EINPROGRESS;
+ }
+
+ /*
+ * Driver will wait for completion DESCMISS transfer,
+ * before starts new, not DESCMISS transfer.
+ */
+ if (!pending_empty && !descmiss_empty) {
+ trace_cdns3_wa2(priv_ep, "wait for pending transfer\n");
+ deferred = 1;
+ }
+
+ if (priv_req->flags & REQUEST_INTERNAL)
+ list_add_tail(&priv_req->list,
+ &priv_ep->wa2_descmiss_req_list);
+ }
+
+ return deferred;
+}
+
+static void cdns3_wa2_remove_old_request(struct cdns3_endpoint *priv_ep)
+{
+ struct cdns3_request *priv_req;
+
+ while (!list_empty(&priv_ep->wa2_descmiss_req_list)) {
+ u8 chain;
+
+ priv_req = cdns3_next_priv_request(&priv_ep->wa2_descmiss_req_list);
+ chain = !!(priv_req->flags & REQUEST_INTERNAL_CH);
+
+ trace_cdns3_wa2(priv_ep, "removes eldest request");
+
+ kfree(priv_req->request.buf);
+ cdns3_gadget_ep_free_request(&priv_ep->endpoint,
+ &priv_req->request);
+ list_del_init(&priv_req->list);
+ --priv_ep->wa2_counter;
+
+ if (!chain)
+ break;
+ }
+}
+
+/**
+ * cdns3_wa2_descmissing_packet - handles descriptor missing event.
+ * @priv_dev: extended gadget object
+ *
+ * This function is used only for WA2. For more information see Work around 2
+ * description.
+ */
+static void cdns3_wa2_descmissing_packet(struct cdns3_endpoint *priv_ep)
+{
+ struct cdns3_request *priv_req;
+ struct usb_request *request;
+
+ if (priv_ep->flags & EP_QUIRK_EXTRA_BUF_DET) {
+ priv_ep->flags &= ~EP_QUIRK_EXTRA_BUF_DET;
+ priv_ep->flags |= EP_QUIRK_EXTRA_BUF_EN;
+ }
+
+ trace_cdns3_wa2(priv_ep, "Description Missing detected\n");
+
+ if (priv_ep->wa2_counter >= CDNS3_WA2_NUM_BUFFERS)
+ cdns3_wa2_remove_old_request(priv_ep);
+
+ request = cdns3_gadget_ep_alloc_request(&priv_ep->endpoint,
+ GFP_ATOMIC);
+ if (!request)
+ goto err;
+
+ priv_req = to_cdns3_request(request);
+ priv_req->flags |= REQUEST_INTERNAL;
+
+ /* if this field is still assigned it indicate that transfer related
+ * with this request has not been finished yet. Driver in this
+ * case simply allocate next request and assign flag REQUEST_INTERNAL_CH
+ * flag to previous one. It will indicate that current request is
+ * part of the previous one.
+ */
+ if (priv_ep->descmis_req)
+ priv_ep->descmis_req->flags |= REQUEST_INTERNAL_CH;
+
+ priv_req->request.buf = kzalloc(CDNS3_DESCMIS_BUF_SIZE,
+ GFP_ATOMIC);
+ priv_ep->wa2_counter++;
+
+ if (!priv_req->request.buf) {
+ cdns3_gadget_ep_free_request(&priv_ep->endpoint, request);
+ goto err;
+ }
+
+ priv_req->request.length = CDNS3_DESCMIS_BUF_SIZE;
+ priv_ep->descmis_req = priv_req;
+
+ __cdns3_gadget_ep_queue(&priv_ep->endpoint,
+ &priv_ep->descmis_req->request,
+ GFP_ATOMIC);
+
+ return;
+
+err:
+ dev_err(priv_ep->cdns3_dev->dev,
+ "Failed: No sufficient memory for DESCMIS\n");
+}
+
+/**
+ * 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)
+{
+ struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+ struct usb_request *request = &priv_req->request;
+
+ list_del_init(&request->list);
+
+ if (request->status == -EINPROGRESS)
+ request->status = status;
+
+ usb_gadget_unmap_request_by_dev(priv_dev->sysdev, request,
+ priv_ep->dir);
+
+ if ((priv_req->flags & REQUEST_UNALIGNED) &&
+ priv_ep->dir == USB_DIR_OUT && !request->status)
+ memcpy(request->buf, priv_req->aligned_buf->buf,
+ request->length);
+
+ priv_req->flags &= ~(REQUEST_PENDING | REQUEST_UNALIGNED);
+ trace_cdns3_gadget_giveback(priv_req);
+
+ if (priv_dev->dev_ver < DEV_VER_V2) {
+ request = cdns3_wa2_gadget_giveback(priv_dev, priv_ep,
+ priv_req);
+ if (!request)
+ return;
+ }
+
+ if (request->complete) {
+ spin_unlock(&priv_dev->lock);
+ usb_gadget_giveback_request(&priv_ep->endpoint,
+ request);
+ spin_lock(&priv_dev->lock);
+ }
+
+ if (request->buf == priv_dev->zlp_buf)
+ cdns3_gadget_ep_free_request(&priv_ep->endpoint, request);
+}
+
+void cdns3_wa1_restore_cycle_bit(struct cdns3_endpoint *priv_ep)
+{
+ /* Work around for stale data address in TRB*/
+ if (priv_ep->wa1_set) {
+ trace_cdns3_wa1(priv_ep, "restore cycle bit");
+
+ priv_ep->wa1_set = 0;
+ priv_ep->wa1_trb_index = 0xFFFF;
+ if (priv_ep->wa1_cycle_bit) {
+ priv_ep->wa1_trb->control =
+ priv_ep->wa1_trb->control | 0x1;
+ } else {
+ priv_ep->wa1_trb->control =
+ priv_ep->wa1_trb->control & ~0x1;
+ }
+ }
+}
+
+static void cdns3_free_aligned_request_buf(struct work_struct *work)
+{
+ struct cdns3_device *priv_dev = container_of(work, struct cdns3_device,
+ aligned_buf_wq);
+ struct cdns3_aligned_buf *buf, *tmp;
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv_dev->lock, flags);
+
+ list_for_each_entry_safe(buf, tmp, &priv_dev->aligned_buf_list, list) {
+ if (!buf->in_use) {
+ list_del(&buf->list);
+
+ /*
+ * Re-enable interrupts to free DMA capable memory.
+ * Driver can't free this memory with disabled
+ * interrupts.
+ */
+ spin_unlock_irqrestore(&priv_dev->lock, flags);
+ dma_free_coherent(priv_dev->sysdev, buf->size,
+ buf->buf, buf->dma);
+ kfree(buf);
+ spin_lock_irqsave(&priv_dev->lock, flags);
+ }
+ }
+
+ spin_unlock_irqrestore(&priv_dev->lock, flags);
+}
+
+static int cdns3_prepare_aligned_request_buf(struct cdns3_request *priv_req)
+{
+ struct cdns3_endpoint *priv_ep = priv_req->priv_ep;
+ struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+ struct cdns3_aligned_buf *buf;
+
+ /* check if buffer is aligned to 8. */
+ if (!((uintptr_t)priv_req->request.buf & 0x7))
+ return 0;
+
+ buf = priv_req->aligned_buf;
+
+ if (!buf || priv_req->request.length > buf->size) {
+ buf = kzalloc(sizeof(*buf), GFP_ATOMIC);
+ if (!buf)
+ return -ENOMEM;
+
+ buf->size = priv_req->request.length;
+
+ buf->buf = dma_alloc_coherent(priv_dev->sysdev,
+ buf->size,
+ &buf->dma,
+ GFP_ATOMIC);
+ if (!buf->buf) {
+ kfree(buf);
+ return -ENOMEM;
+ }
+
+ if (priv_req->aligned_buf) {
+ trace_cdns3_free_aligned_request(priv_req);
+ priv_req->aligned_buf->in_use = 0;
+ queue_work(system_freezable_wq,
+ &priv_dev->aligned_buf_wq);
+ }
+
+ buf->in_use = 1;
+ priv_req->aligned_buf = buf;
+
+ list_add_tail(&buf->list,
+ &priv_dev->aligned_buf_list);
+ }
+
+ if (priv_ep->dir == USB_DIR_IN) {
+ memcpy(buf->buf, priv_req->request.buf,
+ priv_req->request.length);
+ }
+
+ priv_req->flags |= REQUEST_UNALIGNED;
+ trace_cdns3_prepare_aligned_request(priv_req);
+
+ return 0;
+}
+
+static int cdns3_wa1_update_guard(struct cdns3_endpoint *priv_ep,
+ struct cdns3_trb *trb)
+{
+ struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+
+ if (!priv_ep->wa1_set) {
+ u32 doorbell;
+
+ doorbell = !!(readl(&priv_dev->regs->ep_cmd) & EP_CMD_DRDY);
+
+ if (doorbell) {
+ priv_ep->wa1_cycle_bit = priv_ep->pcs ? TRB_CYCLE : 0;
+ priv_ep->wa1_set = 1;
+ priv_ep->wa1_trb = trb;
+ priv_ep->wa1_trb_index = priv_ep->enqueue;
+ trace_cdns3_wa1(priv_ep, "set guard");
+ return 0;
+ }
+ }
+ return 1;
+}
+
+static void cdns3_wa1_tray_restore_cycle_bit(struct cdns3_device *priv_dev,
+ struct cdns3_endpoint *priv_ep)
+{
+ int dma_index;
+ u32 doorbell;
+
+ doorbell = !!(readl(&priv_dev->regs->ep_cmd) & EP_CMD_DRDY);
+ dma_index = cdns3_get_dma_pos(priv_dev, priv_ep);
+
+ if (!doorbell || dma_index != priv_ep->wa1_trb_index)
+ cdns3_wa1_restore_cycle_bit(priv_ep);
+}
+
+/**
+ * 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)
+{
+ struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+ struct cdns3_request *priv_req;
+ struct cdns3_trb *trb;
+ dma_addr_t trb_dma;
+ u32 togle_pcs = 1;
+ int sg_iter = 0;
+ int num_trb;
+ int address;
+ u32 control;
+ int pcs;
+
+ if (priv_ep->type == USB_ENDPOINT_XFER_ISOC)
+ num_trb = priv_ep->interval;
+ else
+ num_trb = request->num_sgs ? request->num_sgs : 1;
+
+ if (num_trb > priv_ep->free_trbs) {
+ priv_ep->flags |= EP_RING_FULL;
+ return -ENOBUFS;
+ }
+
+ priv_req = to_cdns3_request(request);
+ address = priv_ep->endpoint.desc->bEndpointAddress;
+
+ priv_ep->flags |= EP_PENDING_REQUEST;
+
+ /* must allocate buffer aligned to 8 */
+ if (priv_req->flags & REQUEST_UNALIGNED)
+ trb_dma = priv_req->aligned_buf->dma;
+ else
+ trb_dma = request->dma;
+
+ trb = priv_ep->trb_pool + priv_ep->enqueue;
+ priv_req->start_trb = priv_ep->enqueue;
+ priv_req->trb = trb;
+
+ cdns3_select_ep(priv_ep->cdns3_dev, address);
+
+ /* prepare ring */
+ if ((priv_ep->enqueue + num_trb) >= (priv_ep->num_trbs - 1)) {
+ struct cdns3_trb *link_trb;
+ int doorbell, dma_index;
+ u32 ch_bit = 0;
+
+ doorbell = !!(readl(&priv_dev->regs->ep_cmd) & EP_CMD_DRDY);
+ dma_index = cdns3_get_dma_pos(priv_dev, priv_ep);
+
+ /* Driver can't update LINK TRB if it is current processed. */
+ if (doorbell && dma_index == priv_ep->num_trbs - 1) {
+ priv_ep->flags |= EP_DEFERRED_DRDY;
+ return -ENOBUFS;
+ }
+
+ /*updating C bt in Link TRB before starting DMA*/
+ link_trb = priv_ep->trb_pool + (priv_ep->num_trbs - 1);
+ /*
+ * For TRs size equal 2 enabling TRB_CHAIN for epXin causes
+ * that DMA stuck at the LINK TRB.
+ * On the other hand, removing TRB_CHAIN for longer TRs for
+ * epXout cause that DMA stuck after handling LINK TRB.
+ * To eliminate this strange behavioral driver set TRB_CHAIN
+ * bit only for TR size > 2.
+ */
+ if (priv_ep->type == USB_ENDPOINT_XFER_ISOC ||
+ TRBS_PER_SEGMENT > 2)
+ ch_bit = TRB_CHAIN;
+
+ link_trb->control = ((priv_ep->pcs) ? TRB_CYCLE : 0) |
+ TRB_TYPE(TRB_LINK) | TRB_TOGGLE | ch_bit;
+ }
+
+ if (priv_dev->dev_ver <= DEV_VER_V2)
+ togle_pcs = cdns3_wa1_update_guard(priv_ep, trb);
+
+ /* set incorrect Cycle Bit for first trb*/
+ control = priv_ep->pcs ? 0 : TRB_CYCLE;
+
+ do {
+ u32 length;
+ u16 td_size = 0;
+
+ /* fill TRB */
+ control |= TRB_TYPE(TRB_NORMAL);
+ trb->buffer = TRB_BUFFER(request->num_sgs == 0
+ ? trb_dma : request->sg[sg_iter].dma_address);
+
+ if (likely(!request->num_sgs))
+ length = request->length;
+ else
+ length = request->sg[sg_iter].length;
+
+ if (likely(priv_dev->dev_ver >= DEV_VER_V2))
+ td_size = DIV_ROUND_UP(length,
+ priv_ep->endpoint.maxpacket);
+
+ trb->length = TRB_BURST_LEN(priv_ep->trb_burst_size) |
+ TRB_LEN(length);
+ if (priv_dev->gadget.speed == USB_SPEED_SUPER)
+ trb->length |= TRB_TDL_SS_SIZE(td_size);
+ else
+ control |= TRB_TDL_HS_SIZE(td_size);
+
+ pcs = priv_ep->pcs ? TRB_CYCLE : 0;
+
+ /*
+ * first trb should be prepared as last to avoid processing
+ * transfer to early
+ */
+ if (sg_iter != 0)
+ control |= pcs;
+
+ if (priv_ep->type == USB_ENDPOINT_XFER_ISOC && !priv_ep->dir) {
+ control |= TRB_IOC | TRB_ISP;
+ } else {
+ /* for last element in TD or in SG list */
+ if (sg_iter == (num_trb - 1) && sg_iter != 0)
+ control |= pcs | TRB_IOC | TRB_ISP;
+ }
+
+ if (sg_iter)
+ trb->control = control;
+ else
+ priv_req->trb->control = control;
+
+ control = 0;
+ ++sg_iter;
+ priv_req->end_trb = priv_ep->enqueue;
+ cdns3_ep_inc_enq(priv_ep);
+ trb = priv_ep->trb_pool + priv_ep->enqueue;
+ } while (sg_iter < num_trb);
+
+ trb = priv_req->trb;
+
+ priv_req->flags |= REQUEST_PENDING;
+
+ if (sg_iter == 1)
+ trb->control |= TRB_IOC | TRB_ISP;
+
+ /*
+ * Memory barrier - cycle bit must be set before other filds in trb.
+ */
+ wmb();
+
+ /* give the TD to the consumer*/
+ if (togle_pcs)
+ trb->control = trb->control ^ 1;
+
+ if (priv_dev->dev_ver <= DEV_VER_V2)
+ cdns3_wa1_tray_restore_cycle_bit(priv_dev, priv_ep);
+
+ trace_cdns3_prepare_trb(priv_ep, priv_req->trb);
+
+ /*
+ * Memory barrier - Cycle Bit must be set before trb->length and
+ * trb->buffer fields.
+ */
+ wmb();
+
+ /*
+ * For DMULT mode we can set address to transfer ring only once after
+ * enabling endpoint.
+ */
+ if (priv_ep->flags & EP_UPDATE_EP_TRBADDR) {
+ /*
+ * Until SW is not ready to handle the OUT transfer the ISO OUT
+ * Endpoint should be disabled (EP_CFG.ENABLE = 0).
+ * EP_CFG_ENABLE must be set before updating ep_traddr.
+ */
+ if (priv_ep->type == USB_ENDPOINT_XFER_ISOC && !priv_ep->dir &&
+ !(priv_ep->flags & EP_QUIRK_ISO_OUT_EN)) {
+ priv_ep->flags |= EP_QUIRK_ISO_OUT_EN;
+ cdns3_set_register_bit(&priv_dev->regs->ep_cfg,
+ EP_CFG_ENABLE);
+ }
+
+ writel(EP_TRADDR_TRADDR(priv_ep->trb_pool_dma +
+ priv_req->start_trb * TRB_SIZE),
+ &priv_dev->regs->ep_traddr);
+
+ priv_ep->flags &= ~EP_UPDATE_EP_TRBADDR;
+ }
+
+ if (!priv_ep->wa1_set && !(priv_ep->flags & EP_STALLED)) {
+ trace_cdns3_ring(priv_ep);
+ /*clearing TRBERR and EP_STS_DESCMIS before seting DRDY*/
+ writel(EP_STS_TRBERR | EP_STS_DESCMIS, &priv_dev->regs->ep_sts);
+ writel(EP_CMD_DRDY, &priv_dev->regs->ep_cmd);
+ trace_cdns3_doorbell_epx(priv_ep->name,
+ readl(&priv_dev->regs->ep_traddr));
+ }
+
+ /* WORKAROUND for transition to L0 */
+ __cdns3_gadget_wakeup(priv_dev);
+
+ return 0;
+}
+
+void cdns3_set_hw_configuration(struct cdns3_device *priv_dev)
+{
+ struct cdns3_endpoint *priv_ep;
+ struct usb_ep *ep;
+ int val;
+
+ if (priv_dev->hw_configured_flag)
+ return;
+
+ writel(USB_CONF_CFGSET, &priv_dev->regs->usb_conf);
+ writel(EP_CMD_ERDY | EP_CMD_REQ_CMPL, &priv_dev->regs->ep_cmd);
+
+ cdns3_set_register_bit(&priv_dev->regs->usb_conf,
+ USB_CONF_U1EN | USB_CONF_U2EN);
+
+ /* wait until configuration set */
+ readl_poll_timeout_atomic(&priv_dev->regs->usb_sts, val,
+ val & USB_STS_CFGSTS_MASK, 1, 100);
+
+ priv_dev->hw_configured_flag = 1;
+
+ list_for_each_entry(ep, &priv_dev->gadget.ep_list, ep_list) {
+ if (ep->enabled) {
+ priv_ep = ep_to_cdns3_ep(ep);
+ cdns3_start_all_request(priv_dev, priv_ep);
+ }
+ }
+}
+
+/**
+ * cdns3_request_handled - check whether request has been handled by DMA
+ *
+ * @priv_ep: extended endpoint object.
+ * @priv_req: request object for checking
+ *
+ * Endpoint must be selected before invoking this function.
+ *
+ * Returns false if request has not been handled by DMA, else returns true.
+ *
+ * SR - start ring
+ * ER - end ring
+ * DQ = priv_ep->dequeue - dequeue position
+ * EQ = priv_ep->enqueue - enqueue position
+ * ST = priv_req->start_trb - index of first TRB in transfer ring
+ * ET = priv_req->end_trb - index of last TRB in transfer ring
+ * CI = current_index - index of processed TRB by DMA.
+ *
+ * As first step, function checks if cycle bit for priv_req->start_trb is
+ * correct.
+ *
+ * some rules:
+ * 1. priv_ep->dequeue never exceed current_index.
+ * 2 priv_ep->enqueue never exceed priv_ep->dequeue
+ * 3. exception: priv_ep->enqueue == priv_ep->dequeue
+ * and priv_ep->free_trbs is zero.
+ * This case indicate that TR is full.
+ *
+ * Then We can split recognition into two parts:
+ * Case 1 - priv_ep->dequeue < current_index
+ * SR ... EQ ... DQ ... CI ... ER
+ * SR ... DQ ... CI ... EQ ... ER
+ *
+ * Request has been handled by DMA if ST and ET is between DQ and CI.
+ *
+ * Case 2 - priv_ep->dequeue > current_index
+ * This situation take place when CI go through the LINK TRB at the end of
+ * transfer ring.
+ * SR ... CI ... EQ ... DQ ... ER
+ *
+ * Request has been handled by DMA if ET is less then CI or
+ * ET is greater or equal DQ.
+ */
+static bool cdns3_request_handled(struct cdns3_endpoint *priv_ep,
+ struct cdns3_request *priv_req)
+{
+ struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+ struct cdns3_trb *trb = priv_req->trb;
+ int current_index = 0;
+ int handled = 0;
+ int doorbell;
+
+ current_index = cdns3_get_dma_pos(priv_dev, priv_ep);
+ doorbell = !!(readl(&priv_dev->regs->ep_cmd) & EP_CMD_DRDY);
+
+ trb = &priv_ep->trb_pool[priv_req->start_trb];
+
+ if ((trb->control & TRB_CYCLE) != priv_ep->ccs)
+ goto finish;
+
+ if (doorbell == 1 && current_index == priv_ep->dequeue)
+ goto finish;
+
+ /* The corner case for TRBS_PER_SEGMENT equal 2). */
+ if (TRBS_PER_SEGMENT == 2 && priv_ep->type != USB_ENDPOINT_XFER_ISOC) {
+ handled = 1;
+ goto finish;
+ }
+
+ if (priv_ep->enqueue == priv_ep->dequeue &&
+ priv_ep->free_trbs == 0) {
+ handled = 1;
+ } else if (priv_ep->dequeue < current_index) {
+ if ((current_index == (priv_ep->num_trbs - 1)) &&
+ !priv_ep->dequeue)
+ goto finish;
+
+ if (priv_req->end_trb >= priv_ep->dequeue &&
+ priv_req->end_trb < current_index)
+ handled = 1;
+ } else if (priv_ep->dequeue > current_index) {
+ if (priv_req->end_trb < current_index ||
+ priv_req->end_trb >= priv_ep->dequeue)
+ handled = 1;
+ }
+
+finish:
+ trace_cdns3_request_handled(priv_req, current_index, handled);
+
+ return handled;
+}
+
+static void cdns3_transfer_completed(struct cdns3_device *priv_dev,
+ struct cdns3_endpoint *priv_ep)
+{
+ struct cdns3_request *priv_req;
+ struct usb_request *request;
+ struct cdns3_trb *trb;
+
+ while (!list_empty(&priv_ep->pending_req_list)) {
+ request = cdns3_next_request(&priv_ep->pending_req_list);
+ priv_req = to_cdns3_request(request);
+
+ /* Re-select endpoint. It could be changed by other CPU during
+ * handling usb_gadget_giveback_request.
+ */
+ cdns3_select_ep(priv_dev, priv_ep->endpoint.address);
+
+ if (!cdns3_request_handled(priv_ep, priv_req))
+ goto prepare_next_td;
+
+ trb = priv_ep->trb_pool + priv_ep->dequeue;
+ trace_cdns3_complete_trb(priv_ep, trb);
+
+ if (trb != priv_req->trb)
+ dev_warn(priv_dev->dev,
+ "request_trb=0x%p, queue_trb=0x%p\n",
+ priv_req->trb, trb);
+
+ request->actual = TRB_LEN(le32_to_cpu(trb->length));
+ cdns3_move_deq_to_next_trb(priv_req);
+ cdns3_gadget_giveback(priv_ep, priv_req, 0);
+
+ if (priv_ep->type != USB_ENDPOINT_XFER_ISOC &&
+ TRBS_PER_SEGMENT == 2)
+ break;
+ }
+ priv_ep->flags &= ~EP_PENDING_REQUEST;
+
+prepare_next_td:
+ if (!(priv_ep->flags & EP_STALLED) &&
+ !(priv_ep->flags & EP_STALL_PENDING))
+ cdns3_start_all_request(priv_dev, priv_ep);
+}
+
+void cdns3_rearm_transfer(struct cdns3_endpoint *priv_ep, u8 rearm)
+{
+ struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+
+ cdns3_wa1_restore_cycle_bit(priv_ep);
+
+ if (rearm) {
+ trace_cdns3_ring(priv_ep);
+
+ /* Cycle Bit must be updated before arming DMA. */
+ wmb();
+ writel(EP_CMD_DRDY, &priv_dev->regs->ep_cmd);
+
+ __cdns3_gadget_wakeup(priv_dev);
+
+ trace_cdns3_doorbell_epx(priv_ep->name,
+ readl(&priv_dev->regs->ep_traddr));
+ }
+}
+
+/**
+ * cdns3_check_ep_interrupt_proceed - Processes interrupt related to endpoint
+ * @priv_ep: endpoint object
+ *
+ * Returns 0
+ */
+static int cdns3_check_ep_interrupt_proceed(struct cdns3_endpoint *priv_ep)
+{
+ struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+ u32 ep_sts_reg;
+
+ cdns3_select_ep(priv_dev, priv_ep->endpoint.address);
+
+ trace_cdns3_epx_irq(priv_dev, priv_ep);
+
+ ep_sts_reg = readl(&priv_dev->regs->ep_sts);
+ writel(ep_sts_reg, &priv_dev->regs->ep_sts);
+
+ if (ep_sts_reg & EP_STS_TRBERR) {
+ if (priv_ep->flags & EP_STALL_PENDING &&
+ !(ep_sts_reg & EP_STS_DESCMIS &&
+ priv_dev->dev_ver < DEV_VER_V2)) {
+ cdns3_ep_stall_flush(priv_ep);
+ }
+
+ /*
+ * For isochronous transfer driver completes request on
+ * IOC or on TRBERR. IOC appears only when device receive
+ * OUT data packet. If host disable stream or lost some packet
+ * then the only way to finish all queued transfer is to do it
+ * on TRBERR event.
+ */
+ if (priv_ep->type == USB_ENDPOINT_XFER_ISOC &&
+ !priv_ep->wa1_set) {
+ if (!priv_ep->dir) {
+ u32 ep_cfg = readl(&priv_dev->regs->ep_cfg);
+
+ ep_cfg &= ~EP_CFG_ENABLE;
+ writel(ep_cfg, &priv_dev->regs->ep_cfg);
+ priv_ep->flags &= ~EP_QUIRK_ISO_OUT_EN;
+ }
+ cdns3_transfer_completed(priv_dev, priv_ep);
+ } else if (!(priv_ep->flags & EP_STALLED) &&
+ !(priv_ep->flags & EP_STALL_PENDING)) {
+ if (priv_ep->flags & EP_DEFERRED_DRDY) {
+ priv_ep->flags &= ~EP_DEFERRED_DRDY;
+ cdns3_start_all_request(priv_dev, priv_ep);
+ } else {
+ cdns3_rearm_transfer(priv_ep,
+ priv_ep->wa1_set);
+ }
+ }
+ }
+
+ if ((ep_sts_reg & EP_STS_IOC) || (ep_sts_reg & EP_STS_ISP)) {
+ if (priv_ep->flags & EP_QUIRK_EXTRA_BUF_EN) {
+ if (ep_sts_reg & EP_STS_ISP)
+ priv_ep->flags |= EP_QUIRK_END_TRANSFER;
+ else
+ priv_ep->flags &= ~EP_QUIRK_END_TRANSFER;
+ }
+
+ cdns3_transfer_completed(priv_dev, priv_ep);
+ }
+
+ /*
+ * WA2: this condition should only be meet when
+ * priv_ep->flags & EP_QUIRK_EXTRA_BUF_DET or
+ * priv_ep->flags & EP_QUIRK_EXTRA_BUF_EN.
+ * In other cases this interrupt will be disabled/
+ */
+ if (ep_sts_reg & EP_STS_DESCMIS && priv_dev->dev_ver < DEV_VER_V2 &&
+ !(priv_ep->flags & EP_STALLED))
+ cdns3_wa2_descmissing_packet(priv_ep);
+
+ return 0;
+}
+
+static void cdns3_disconnect_gadget(struct cdns3_device *priv_dev)
+{
+ if (priv_dev->gadget_driver && priv_dev->gadget_driver->disconnect) {
+ spin_unlock(&priv_dev->lock);
+ priv_dev->gadget_driver->disconnect(&priv_dev->gadget);
+ spin_lock(&priv_dev->lock);
+ }
+}
+
+/**
+ * cdns3_check_usb_interrupt_proceed - Processes interrupt related to device
+ * @priv_dev: extended gadget object
+ * @usb_ists: bitmap representation of device's reported interrupts
+ * (usb_ists register value)
+ */
+static void cdns3_check_usb_interrupt_proceed(struct cdns3_device *priv_dev,
+ u32 usb_ists)
+{
+ int speed = 0;
+
+ trace_cdns3_usb_irq(priv_dev, usb_ists);
+ if (usb_ists & USB_ISTS_L1ENTI) {
+ /*
+ * WORKAROUND: CDNS3 controller has issue with hardware resuming
+ * from L1. To fix it, if any DMA transfer is pending driver
+ * must starts driving resume signal immediately.
+ */
+ if (readl(&priv_dev->regs->drbl))
+ __cdns3_gadget_wakeup(priv_dev);
+ }
+
+ /* Connection detected */
+ if (usb_ists & (USB_ISTS_CON2I | USB_ISTS_CONI)) {
+ speed = cdns3_get_speed(priv_dev);
+ priv_dev->gadget.speed = speed;
+ usb_gadget_set_state(&priv_dev->gadget, USB_STATE_POWERED);
+ cdns3_ep0_config(priv_dev);
+ }
+
+ /* Disconnection detected */
+ if (usb_ists & (USB_ISTS_DIS2I | USB_ISTS_DISI)) {
+ cdns3_disconnect_gadget(priv_dev);
+ priv_dev->gadget.speed = USB_SPEED_UNKNOWN;
+ usb_gadget_set_state(&priv_dev->gadget, USB_STATE_NOTATTACHED);
+ cdns3_hw_reset_eps_config(priv_dev);
+ }
+
+ if (usb_ists & (USB_ISTS_L2ENTI | USB_ISTS_U3ENTI)) {
+ if (priv_dev->gadget_driver &&
+ priv_dev->gadget_driver->suspend) {
+ spin_unlock(&priv_dev->lock);
+ priv_dev->gadget_driver->suspend(&priv_dev->gadget);
+ spin_lock(&priv_dev->lock);
+ }
+ }
+
+ if (usb_ists & (USB_ISTS_L2EXTI | USB_ISTS_U3EXTI)) {
+ if (priv_dev->gadget_driver &&
+ priv_dev->gadget_driver->resume) {
+ spin_unlock(&priv_dev->lock);
+ priv_dev->gadget_driver->resume(&priv_dev->gadget);
+ spin_lock(&priv_dev->lock);
+ }
+ }
+
+ /* reset*/
+ if (usb_ists & (USB_ISTS_UWRESI | USB_ISTS_UHRESI | USB_ISTS_U2RESI)) {
+ if (priv_dev->gadget_driver) {
+ spin_unlock(&priv_dev->lock);
+ usb_gadget_udc_reset(&priv_dev->gadget,
+ priv_dev->gadget_driver);
+ spin_lock(&priv_dev->lock);
+
+ /*read again to check the actual speed*/
+ speed = cdns3_get_speed(priv_dev);
+ priv_dev->gadget.speed = speed;
+ cdns3_hw_reset_eps_config(priv_dev);
+ cdns3_ep0_config(priv_dev);
+ }
+ }
+}
+
+/**
+ * cdns3_device_irq_handler- interrupt handler for device part of controller
+ *
+ * @irq: irq number for cdns3 core device
+ * @data: structure of cdns3
+ *
+ * Returns IRQ_HANDLED or IRQ_NONE
+ */
+static irqreturn_t cdns3_device_irq_handler(int irq, void *data)
+{
+ struct cdns3_device *priv_dev;
+ struct cdns3 *cdns = data;
+ irqreturn_t ret = IRQ_NONE;
+ u32 reg;
+
+ priv_dev = cdns->gadget_dev;
+
+ /* check USB device interrupt */
+ reg = readl(&priv_dev->regs->usb_ists);
+ if (reg) {
+ /* After masking interrupts the new interrupts won't be
+ * reported in usb_ists/ep_ists. In order to not lose some
+ * of them driver disables only detected interrupts.
+ * They will be enabled ASAP after clearing source of
+ * interrupt. This an unusual behavior only applies to
+ * usb_ists register.
+ */
+ reg = ~reg & readl(&priv_dev->regs->usb_ien);
+ /* mask deferred interrupt. */
+ writel(reg, &priv_dev->regs->usb_ien);
+ ret = IRQ_WAKE_THREAD;
+ }
+
+ /* check endpoint interrupt */
+ reg = readl(&priv_dev->regs->ep_ists);
+ if (reg) {
+ writel(0, &priv_dev->regs->ep_ien);
+ ret = IRQ_WAKE_THREAD;
+ }
+
+ return ret;
+}
+
+/**
+ * cdns3_device_thread_irq_handler- interrupt handler for device part
+ * of controller
+ *
+ * @irq: irq number for cdns3 core device
+ * @data: structure of cdns3
+ *
+ * Returns IRQ_HANDLED or IRQ_NONE
+ */
+static irqreturn_t cdns3_device_thread_irq_handler(int irq, void *data)
+{
+ struct cdns3_device *priv_dev;
+ struct cdns3 *cdns = data;
+ irqreturn_t ret = IRQ_NONE;
+ unsigned long flags;
+ int bit;
+ u32 reg;
+
+ priv_dev = cdns->gadget_dev;
+ spin_lock_irqsave(&priv_dev->lock, flags);
+
+ reg = readl(&priv_dev->regs->usb_ists);
+ if (reg) {
+ writel(reg, &priv_dev->regs->usb_ists);
+ writel(USB_IEN_INIT, &priv_dev->regs->usb_ien);
+ cdns3_check_usb_interrupt_proceed(priv_dev, reg);
+ ret = IRQ_HANDLED;
+ }
+
+ reg = readl(&priv_dev->regs->ep_ists);
+
+ /* handle default endpoint OUT */
+ if (reg & EP_ISTS_EP_OUT0) {
+ cdns3_check_ep0_interrupt_proceed(priv_dev, USB_DIR_OUT);
+ ret = IRQ_HANDLED;
+ }
+
+ /* handle default endpoint IN */
+ if (reg & EP_ISTS_EP_IN0) {
+ cdns3_check_ep0_interrupt_proceed(priv_dev, USB_DIR_IN);
+ ret = IRQ_HANDLED;
+ }
+
+ /* check if interrupt from non default endpoint, if no exit */
+ reg &= ~(EP_ISTS_EP_OUT0 | EP_ISTS_EP_IN0);
+ if (!reg)
+ goto irqend;
+
+ for_each_set_bit(bit, (unsigned long *)&reg,
+ sizeof(u32) * BITS_PER_BYTE) {
+ cdns3_check_ep_interrupt_proceed(priv_dev->eps[bit]);
+ ret = IRQ_HANDLED;
+ }
+
+irqend:
+ writel(~0, &priv_dev->regs->ep_ien);
+ spin_unlock_irqrestore(&priv_dev->lock, flags);
+
+ return ret;
+}
+
+/**
+ * cdns3_ep_onchip_buffer_reserve - Try to reserve onchip buf for EP
+ *
+ * The real reservation will occur during write to EP_CFG register,
+ * this function is used to check if the 'size' reservation is allowed.
+ *
+ * @priv_dev: extended gadget object
+ * @size: the size (KB) for EP would like to allocate
+ * @is_in: endpoint direction
+ *
+ * Return 0 if the required size can met or negative value on failure
+ */
+static int cdns3_ep_onchip_buffer_reserve(struct cdns3_device *priv_dev,
+ int size, int is_in)
+{
+ int remained;
+
+ /* 2KB are reserved for EP0*/
+ remained = priv_dev->onchip_buffers - priv_dev->onchip_used_size - 2;
+
+ if (is_in) {
+ if (remained < size)
+ return -EPERM;
+
+ priv_dev->onchip_used_size += size;
+ } else {
+ int required;
+
+ /**
+ * ALL OUT EPs are shared the same chunk onchip memory, so
+ * driver checks if it already has assigned enough buffers
+ */
+ if (priv_dev->out_mem_is_allocated >= size)
+ return 0;
+
+ required = size - priv_dev->out_mem_is_allocated;
+
+ if (required > remained)
+ return -EPERM;
+
+ priv_dev->out_mem_is_allocated += required;
+ priv_dev->onchip_used_size += required;
+ }
+
+ return 0;
+}
+
+void cdns3_configure_dmult(struct cdns3_device *priv_dev,
+ struct cdns3_endpoint *priv_ep)
+{
+ struct cdns3_usb_regs __iomem *regs = priv_dev->regs;
+
+ /* For dev_ver > DEV_VER_V2 DMULT is configured per endpoint */
+ if (priv_dev->dev_ver <= DEV_VER_V2)
+ writel(USB_CONF_DMULT, &regs->usb_conf);
+
+ if (priv_dev->dev_ver == DEV_VER_V2)
+ writel(USB_CONF2_EN_TDL_TRB, &regs->usb_conf2);
+
+ if (priv_dev->dev_ver >= DEV_VER_V3 && priv_ep) {
+ u32 mask;
+
+ if (priv_ep->dir)
+ mask = BIT(priv_ep->num + 16);
+ else
+ mask = BIT(priv_ep->num);
+
+ if (priv_ep->type != USB_ENDPOINT_XFER_ISOC) {
+ cdns3_set_register_bit(&regs->tdl_from_trb, mask);
+ cdns3_set_register_bit(&regs->tdl_beh, mask);
+ cdns3_set_register_bit(&regs->tdl_beh2, mask);
+ cdns3_set_register_bit(&regs->dma_adv_td, mask);
+ }
+
+ if (priv_ep->type == USB_ENDPOINT_XFER_ISOC && !priv_ep->dir)
+ cdns3_set_register_bit(&regs->tdl_from_trb, mask);
+
+ cdns3_set_register_bit(&regs->dtrans, mask);
+ }
+}
+
+/**
+ * cdns3_ep_config Configure hardware endpoint
+ * @priv_ep: extended endpoint object
+ */
+void cdns3_ep_config(struct cdns3_endpoint *priv_ep)
+{
+ bool is_iso_ep = (priv_ep->type == USB_ENDPOINT_XFER_ISOC);
+ struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+ u32 bEndpointAddress = priv_ep->num | priv_ep->dir;
+ u32 max_packet_size = 0;
+ u8 maxburst = 0;
+ u32 ep_cfg = 0;
+ u8 buffering;
+ u8 mult = 0;
+ int ret;
+
+ buffering = CDNS3_EP_BUF_SIZE - 1;
+
+ cdns3_configure_dmult(priv_dev, priv_ep);
+
+ switch (priv_ep->type) {
+ case USB_ENDPOINT_XFER_INT:
+ ep_cfg = EP_CFG_EPTYPE(USB_ENDPOINT_XFER_INT);
+
+ if ((priv_dev->dev_ver == DEV_VER_V2 && !priv_ep->dir) ||
+ priv_dev->dev_ver > DEV_VER_V2)
+ ep_cfg |= EP_CFG_TDL_CHK;
+ break;
+ case USB_ENDPOINT_XFER_BULK:
+ ep_cfg = EP_CFG_EPTYPE(USB_ENDPOINT_XFER_BULK);
+
+ if ((priv_dev->dev_ver == DEV_VER_V2 && !priv_ep->dir) ||
+ priv_dev->dev_ver > DEV_VER_V2)
+ ep_cfg |= EP_CFG_TDL_CHK;
+ break;
+ default:
+ ep_cfg = EP_CFG_EPTYPE(USB_ENDPOINT_XFER_ISOC);
+ mult = CDNS3_EP_ISO_HS_MULT - 1;
+ buffering = mult + 1;
+ }
+
+ switch (priv_dev->gadget.speed) {
+ case USB_SPEED_FULL:
+ max_packet_size = is_iso_ep ? 1023 : 64;
+ break;
+ case USB_SPEED_HIGH:
+ max_packet_size = is_iso_ep ? 1024 : 512;
+ break;
+ case USB_SPEED_SUPER:
+ /* It's limitation that driver assumes in driver. */
+ mult = 0;
+ max_packet_size = 1024;
+ if (priv_ep->type == USB_ENDPOINT_XFER_ISOC) {
+ maxburst = CDNS3_EP_ISO_SS_BURST - 1;
+ buffering = (mult + 1) *
+ (maxburst + 1);
+
+ if (priv_ep->interval > 1)
+ buffering++;
+ } else {
+ maxburst = CDNS3_EP_BUF_SIZE - 1;
+ }
+ break;
+ default:
+ /* all other speed are not supported */
+ return;
+ }
+
+ if (max_packet_size == 1024)
+ priv_ep->trb_burst_size = 128;
+ else if (max_packet_size >= 512)
+ priv_ep->trb_burst_size = 64;
+ else
+ priv_ep->trb_burst_size = 16;
+
+ ret = cdns3_ep_onchip_buffer_reserve(priv_dev, buffering + 1,
+ !!priv_ep->dir);
+ if (ret) {
+ dev_err(priv_dev->dev, "onchip mem is full, ep is invalid\n");
+ return;
+ }
+
+ ep_cfg |= EP_CFG_MAXPKTSIZE(max_packet_size) |
+ EP_CFG_MULT(mult) |
+ EP_CFG_BUFFERING(buffering) |
+ EP_CFG_MAXBURST(maxburst);
+
+ cdns3_select_ep(priv_dev, bEndpointAddress);
+ writel(ep_cfg, &priv_dev->regs->ep_cfg);
+
+ dev_dbg(priv_dev->dev, "Configure %s: with val %08x\n",
+ priv_ep->name, ep_cfg);
+}
+
+/* Find correct direction for HW endpoint according to description */
+static int cdns3_ep_dir_is_correct(struct usb_endpoint_descriptor *desc,
+ struct cdns3_endpoint *priv_ep)
+{
+ return (priv_ep->endpoint.caps.dir_in && usb_endpoint_dir_in(desc)) ||
+ (priv_ep->endpoint.caps.dir_out && usb_endpoint_dir_out(desc));
+}
+
+static struct
+cdns3_endpoint *cdns3_find_available_ep(struct cdns3_device *priv_dev,
+ struct usb_endpoint_descriptor *desc)
+{
+ struct usb_ep *ep;
+ struct cdns3_endpoint *priv_ep;
+
+ list_for_each_entry(ep, &priv_dev->gadget.ep_list, ep_list) {
+ unsigned long num;
+ int ret;
+ /* ep name pattern likes epXin or epXout */
+ char c[2] = {ep->name[2], '\0'};
+
+ ret = kstrtoul(c, 10, &num);
+ if (ret)
+ return ERR_PTR(ret);
+
+ priv_ep = ep_to_cdns3_ep(ep);
+ if (cdns3_ep_dir_is_correct(desc, priv_ep)) {
+ if (!(priv_ep->flags & EP_CLAIMED)) {
+ priv_ep->num = num;
+ return priv_ep;
+ }
+ }
+ }
+
+ return ERR_PTR(-ENOENT);
+}
+
+/*
+ * Cadence IP has one limitation that all endpoints must be configured
+ * (Type & MaxPacketSize) before setting configuration through hardware
+ * register, it means we can't change endpoints configuration after
+ * set_configuration.
+ *
+ * This function set EP_CLAIMED flag which is added when the gadget driver
+ * uses usb_ep_autoconfig to configure specific endpoint;
+ * When the udc driver receives set_configurion request,
+ * it goes through all claimed endpoints, and configure all endpoints
+ * accordingly.
+ *
+ * At usb_ep_ops.enable/disable, we only enable and disable endpoint through
+ * ep_cfg register which can be changed after set_configuration, and do
+ * some software operation accordingly.
+ */
+static struct
+usb_ep *cdns3_gadget_match_ep(struct usb_gadget *gadget,
+ struct usb_endpoint_descriptor *desc,
+ struct usb_ss_ep_comp_descriptor *comp_desc)
+{
+ struct cdns3_device *priv_dev = gadget_to_cdns3_device(gadget);
+ struct cdns3_endpoint *priv_ep;
+ unsigned long flags;
+
+ priv_ep = cdns3_find_available_ep(priv_dev, desc);
+ if (IS_ERR(priv_ep)) {
+ dev_err(priv_dev->dev, "no available ep\n");
+ return NULL;
+ }
+
+ dev_dbg(priv_dev->dev, "match endpoint: %s\n", priv_ep->name);
+
+ spin_lock_irqsave(&priv_dev->lock, flags);
+ priv_ep->endpoint.desc = desc;
+ priv_ep->dir = usb_endpoint_dir_in(desc) ? USB_DIR_IN : USB_DIR_OUT;
+ priv_ep->type = usb_endpoint_type(desc);
+ priv_ep->flags |= EP_CLAIMED;
+ priv_ep->interval = desc->bInterval ? BIT(desc->bInterval - 1) : 0;
+
+ spin_unlock_irqrestore(&priv_dev->lock, flags);
+ return &priv_ep->endpoint;
+}
+
+/**
+ * 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_endpoint *priv_ep = ep_to_cdns3_ep(ep);
+ struct cdns3_request *priv_req;
+
+ priv_req = kzalloc(sizeof(*priv_req), gfp_flags);
+ if (!priv_req)
+ return NULL;
+
+ priv_req->priv_ep = priv_ep;
+
+ trace_cdns3_alloc_request(priv_req);
+ 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);
+
+ if (priv_req->aligned_buf)
+ priv_req->aligned_buf->in_use = 0;
+
+ trace_cdns3_free_request(priv_req);
+ kfree(priv_req);
+}
+
+/**
+ * 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;
+ u32 reg = EP_STS_EN_TRBERREN;
+ u32 bEndpointAddress;
+ unsigned long flags;
+ int enable = 1;
+ int ret;
+ int val;
+
+ priv_ep = ep_to_cdns3_ep(ep);
+ priv_dev = priv_ep->cdns3_dev;
+
+ if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
+ dev_dbg(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;
+
+ spin_lock_irqsave(&priv_dev->lock, flags);
+
+ priv_ep->endpoint.desc = desc;
+ priv_ep->type = usb_endpoint_type(desc);
+ priv_ep->interval = desc->bInterval ? BIT(desc->bInterval - 1) : 0;
+
+ if (priv_ep->interval > ISO_MAX_INTERVAL &&
+ priv_ep->type == USB_ENDPOINT_XFER_ISOC) {
+ dev_err(priv_dev->dev, "Driver is limited to %d period\n",
+ ISO_MAX_INTERVAL);
+
+ ret = -EINVAL;
+ goto exit;
+ }
+
+ ret = cdns3_allocate_trb_pool(priv_ep);
+
+ if (ret)
+ goto exit;
+
+ bEndpointAddress = priv_ep->num | priv_ep->dir;
+ cdns3_select_ep(priv_dev, bEndpointAddress);
+
+ trace_cdns3_gadget_ep_enable(priv_ep);
+
+ writel(EP_CMD_EPRST, &priv_dev->regs->ep_cmd);
+
+ ret = readl_poll_timeout_atomic(&priv_dev->regs->ep_cmd, val,
+ !(val & (EP_CMD_CSTALL | EP_CMD_EPRST)),
+ 1, 1000);
+
+ if (unlikely(ret)) {
+ cdns3_free_trb_pool(priv_ep);
+ ret = -EINVAL;
+ goto exit;
+ }
+
+ /* enable interrupt for selected endpoint */
+ cdns3_set_register_bit(&priv_dev->regs->ep_ien,
+ BIT(cdns3_ep_addr_to_index(bEndpointAddress)));
+
+ if (priv_dev->dev_ver < DEV_VER_V2)
+ cdns3_wa2_enable_detection(priv_dev, priv_ep, reg);
+
+ writel(reg, &priv_dev->regs->ep_sts_en);
+
+ /*
+ * For some versions of controller at some point during ISO OUT traffic
+ * DMA reads Transfer Ring for the EP which has never got doorbell.
+ * This issue was detected only on simulation, but to avoid this issue
+ * driver add protection against it. To fix it driver enable ISO OUT
+ * endpoint before setting DRBL. This special treatment of ISO OUT
+ * endpoints are recommended by controller specification.
+ */
+ if (priv_ep->type == USB_ENDPOINT_XFER_ISOC && !priv_ep->dir)
+ enable = 0;
+
+ if (enable)
+ cdns3_set_register_bit(&priv_dev->regs->ep_cfg, EP_CFG_ENABLE);
+
+ ep->desc = desc;
+ priv_ep->flags &= ~(EP_PENDING_REQUEST | EP_STALLED | EP_STALL_PENDING |
+ EP_QUIRK_ISO_OUT_EN | EP_QUIRK_EXTRA_BUF_EN);
+ priv_ep->flags |= EP_ENABLED | EP_UPDATE_EP_TRBADDR;
+ priv_ep->wa1_set = 0;
+ priv_ep->enqueue = 0;
+ priv_ep->dequeue = 0;
+ reg = readl(&priv_dev->regs->ep_sts);
+ priv_ep->pcs = !!EP_STS_CCS(reg);
+ priv_ep->ccs = !!EP_STS_CCS(reg);
+ /* one TRB is reserved for link TRB used in DMULT mode*/
+ priv_ep->free_trbs = priv_ep->num_trbs - 1;
+exit:
+ spin_unlock_irqrestore(&priv_dev->lock, flags);
+
+ return ret;
+}
+
+/**
+ * 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_request *priv_req;
+ struct cdns3_device *priv_dev;
+ struct usb_request *request;
+ unsigned long flags;
+ int ret = 0;
+ u32 ep_cfg;
+ int val;
+
+ if (!ep) {
+ pr_err("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);
+
+ trace_cdns3_gadget_ep_disable(priv_ep);
+
+ cdns3_select_ep(priv_dev, ep->desc->bEndpointAddress);
+
+ ep_cfg = readl(&priv_dev->regs->ep_cfg);
+ ep_cfg &= ~EP_CFG_ENABLE;
+ writel(ep_cfg, &priv_dev->regs->ep_cfg);
+
+ /**
+ * Driver needs some time before resetting endpoint.
+ * It need waits for clearing DBUSY bit or for timeout expired.
+ * 10us is enough time for controller to stop transfer.
+ */
+ readl_poll_timeout_atomic(&priv_dev->regs->ep_sts, val,
+ !(val & EP_STS_DBUSY), 1, 10);
+ writel(EP_CMD_EPRST, &priv_dev->regs->ep_cmd);
+
+ readl_poll_timeout_atomic(&priv_dev->regs->ep_cmd, val,
+ !(val & (EP_CMD_CSTALL | EP_CMD_EPRST)),
+ 1, 1000);
+ if (unlikely(ret))
+ dev_err(priv_dev->dev, "Timeout: %s resetting failed.\n",
+ priv_ep->name);
+
+ while (!list_empty(&priv_ep->pending_req_list)) {
+ request = cdns3_next_request(&priv_ep->pending_req_list);
+
+ cdns3_gadget_giveback(priv_ep, to_cdns3_request(request),
+ -ESHUTDOWN);
+ }
+
+ while (!list_empty(&priv_ep->wa2_descmiss_req_list)) {
+ priv_req = cdns3_next_priv_request(&priv_ep->wa2_descmiss_req_list);
+
+ kfree(priv_req->request.buf);
+ cdns3_gadget_ep_free_request(&priv_ep->endpoint,
+ &priv_req->request);
+ list_del_init(&priv_req->list);
+ --priv_ep->wa2_counter;
+ }
+
+ while (!list_empty(&priv_ep->deferred_req_list)) {
+ request = cdns3_next_request(&priv_ep->deferred_req_list);
+
+ cdns3_gadget_giveback(priv_ep, to_cdns3_request(request),
+ -ESHUTDOWN);
+ }
+
+ priv_ep->descmis_req = NULL;
+
+ ep->desc = NULL;
+ priv_ep->flags &= ~EP_ENABLED;
+
+ spin_unlock_irqrestore(&priv_dev->lock, flags);
+
+ return ret;
+}
+
+/**
+ * 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;
+ struct cdns3_request *priv_req;
+ int ret = 0;
+
+ request->actual = 0;
+ request->status = -EINPROGRESS;
+ priv_req = to_cdns3_request(request);
+ trace_cdns3_ep_queue(priv_req);
+
+ if (priv_dev->dev_ver < DEV_VER_V2) {
+ ret = cdns3_wa2_gadget_ep_queue(priv_dev, priv_ep,
+ priv_req);
+
+ if (ret == EINPROGRESS)
+ return 0;
+ }
+
+ ret = cdns3_prepare_aligned_request_buf(priv_req);
+ if (ret < 0)
+ return ret;
+
+ ret = usb_gadget_map_request_by_dev(priv_dev->sysdev, request,
+ usb_endpoint_dir_in(ep->desc));
+ if (ret)
+ return ret;
+
+ list_add_tail(&request->list, &priv_ep->deferred_req_list);
+
+ /*
+ * If hardware endpoint configuration has not been set yet then
+ * just queue request in deferred list. Transfer will be started in
+ * cdns3_set_hw_configuration.
+ */
+ if (priv_dev->hw_configured_flag && !(priv_ep->flags & EP_STALLED) &&
+ !(priv_ep->flags & EP_STALL_PENDING))
+ cdns3_start_all_request(priv_dev, priv_ep);
+
+ return 0;
+}
+
+static int cdns3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,
+ gfp_t gfp_flags)
+{
+ struct usb_request *zlp_request;
+ struct cdns3_endpoint *priv_ep;
+ struct cdns3_device *priv_dev;
+ unsigned long flags;
+ int ret;
+
+ if (!request || !ep)
+ return -EINVAL;
+
+ priv_ep = ep_to_cdns3_ep(ep);
+ priv_dev = priv_ep->cdns3_dev;
+
+ 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)) {
+ struct cdns3_request *priv_req;
+
+ zlp_request = cdns3_gadget_ep_alloc_request(ep, GFP_ATOMIC);
+ zlp_request->buf = priv_dev->zlp_buf;
+ zlp_request->length = 0;
+
+ priv_req = to_cdns3_request(zlp_request);
+ priv_req->flags |= REQUEST_ZLP;
+
+ 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;
+ struct cdns3_request *priv_req;
+ struct cdns3_trb *link_trb;
+ unsigned long flags;
+ int ret = 0;
+
+ if (!ep || !request || !ep->desc)
+ return -EINVAL;
+
+ spin_lock_irqsave(&priv_dev->lock, flags);
+
+ priv_req = to_cdns3_request(request);
+
+ trace_cdns3_ep_dequeue(priv_req);
+
+ cdns3_select_ep(priv_dev, ep->desc->bEndpointAddress);
+
+ list_for_each_entry_safe(req, req_temp, &priv_ep->pending_req_list,
+ list) {
+ if (request == req)
+ goto found;
+ }
+
+ list_for_each_entry_safe(req, req_temp, &priv_ep->deferred_req_list,
+ list) {
+ if (request == req)
+ goto found;
+ }
+
+ goto not_found;
+
+found:
+
+ if (priv_ep->wa1_trb == priv_req->trb)
+ cdns3_wa1_restore_cycle_bit(priv_ep);
+
+ link_trb = priv_req->trb;
+ cdns3_move_deq_to_next_trb(priv_req);
+ cdns3_gadget_giveback(priv_ep, priv_req, -ECONNRESET);
+
+ /* Update ring */
+ request = cdns3_next_request(&priv_ep->deferred_req_list);
+ if (request) {
+ priv_req = to_cdns3_request(request);
+
+ link_trb->buffer = TRB_BUFFER(priv_ep->trb_pool_dma +
+ (priv_req->start_trb * TRB_SIZE));
+ link_trb->control = (link_trb->control & TRB_CYCLE) |
+ TRB_TYPE(TRB_LINK) | TRB_CHAIN | TRB_TOGGLE;
+ } else {
+ priv_ep->flags |= EP_UPDATE_EP_TRBADDR;
+ }
+
+not_found:
+ spin_unlock_irqrestore(&priv_dev->lock, flags);
+ return ret;
+}
+
+/**
+ * __cdns3_gadget_ep_set_halt Sets stall on selected endpoint
+ * Should be called after acquiring spin_lock and selecting ep
+ * @ep: endpoint object to set stall on.
+ */
+void __cdns3_gadget_ep_set_halt(struct cdns3_endpoint *priv_ep)
+{
+ struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+
+ trace_cdns3_halt(priv_ep, 1, 0);
+
+ if (!(priv_ep->flags & EP_STALLED)) {
+ u32 ep_sts_reg = readl(&priv_dev->regs->ep_sts);
+
+ if (!(ep_sts_reg & EP_STS_DBUSY))
+ cdns3_ep_stall_flush(priv_ep);
+ else
+ priv_ep->flags |= EP_STALL_PENDING;
+ }
+}
+
+/**
+ * __cdns3_gadget_ep_clear_halt Clears stall on selected endpoint
+ * Should be called after acquiring spin_lock and selecting ep
+ * @ep: endpoint object to clear stall on
+ */
+int __cdns3_gadget_ep_clear_halt(struct cdns3_endpoint *priv_ep)
+{
+ struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+ struct usb_request *request;
+ int ret;
+ int val;
+
+ trace_cdns3_halt(priv_ep, 0, 0);
+
+ writel(EP_CMD_CSTALL | EP_CMD_EPRST, &priv_dev->regs->ep_cmd);
+
+ /* wait for EPRST cleared */
+ ret = readl_poll_timeout_atomic(&priv_dev->regs->ep_cmd, val,
+ !(val & EP_CMD_EPRST), 1, 100);
+ if (ret)
+ return -EINVAL;
+
+ priv_ep->flags &= ~(EP_STALLED | EP_STALL_PENDING);
+
+ request = cdns3_next_request(&priv_ep->pending_req_list);
+
+ if (request)
+ cdns3_rearm_transfer(priv_ep, 1);
+
+ cdns3_start_all_request(priv_dev, priv_ep);
+ 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;
+
+ spin_lock_irqsave(&priv_dev->lock, flags);
+
+ cdns3_select_ep(priv_dev, ep->desc->bEndpointAddress);
+
+ if (!value) {
+ priv_ep->flags &= ~EP_WEDGE;
+ ret = __cdns3_gadget_ep_clear_halt(priv_ep);
+ } else {
+ __cdns3_gadget_ep_set_halt(priv_ep);
+ }
+
+ 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
+ *
+ * Returns number of actual ITP frame
+ */
+static int cdns3_gadget_get_frame(struct usb_gadget *gadget)
+{
+ struct cdns3_device *priv_dev = gadget_to_cdns3_device(gadget);
+
+ return readl(&priv_dev->regs->usb_itpn);
+}
+
+int __cdns3_gadget_wakeup(struct cdns3_device *priv_dev)
+{
+ enum usb_device_speed speed;
+
+ speed = cdns3_get_speed(priv_dev);
+
+ if (speed >= USB_SPEED_SUPER)
+ return 0;
+
+ /* Start driving resume signaling to indicate remote wakeup. */
+ writel(USB_CONF_LGO_L0, &priv_dev->regs->usb_conf);
+
+ return 0;
+}
+
+static int cdns3_gadget_wakeup(struct usb_gadget *gadget)
+{
+ struct cdns3_device *priv_dev = gadget_to_cdns3_device(gadget);
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&priv_dev->lock, flags);
+ ret = __cdns3_gadget_wakeup(priv_dev);
+ spin_unlock_irqrestore(&priv_dev->lock, flags);
+ return ret;
+}
+
+static int cdns3_gadget_set_selfpowered(struct usb_gadget *gadget,
+ int is_selfpowered)
+{
+ struct cdns3_device *priv_dev = gadget_to_cdns3_device(gadget);
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv_dev->lock, flags);
+ priv_dev->is_selfpowered = !!is_selfpowered;
+ spin_unlock_irqrestore(&priv_dev->lock, flags);
+ return 0;
+}
+
+static int cdns3_gadget_pullup(struct usb_gadget *gadget, int is_on)
+{
+ struct cdns3_device *priv_dev = gadget_to_cdns3_device(gadget);
+
+ if (is_on)
+ writel(USB_CONF_DEVEN, &priv_dev->regs->usb_conf);
+ else
+ writel(USB_CONF_DEVDS, &priv_dev->regs->usb_conf);
+
+ return 0;
+}
+
+static void cdns3_gadget_config(struct cdns3_device *priv_dev)
+{
+ struct cdns3_usb_regs __iomem *regs = priv_dev->regs;
+ u32 reg;
+
+ cdns3_ep0_config(priv_dev);
+
+ /* enable interrupts for endpoint 0 (in and out) */
+ writel(EP_IEN_EP_OUT0 | EP_IEN_EP_IN0, &regs->ep_ien);
+
+ /*
+ * Driver needs to modify LFPS minimal U1 Exit time for DEV_VER_TI_V1
+ * revision of controller.
+ */
+ if (priv_dev->dev_ver == DEV_VER_TI_V1) {
+ reg = readl(&regs->dbg_link1);
+
+ reg &= ~DBG_LINK1_LFPS_MIN_GEN_U1_EXIT_MASK;
+ reg |= DBG_LINK1_LFPS_MIN_GEN_U1_EXIT(0x55) |
+ DBG_LINK1_LFPS_MIN_GEN_U1_EXIT_SET;
+ writel(reg, &regs->dbg_link1);
+ }
+
+ /*
+ * By default some platforms has set protected access to memory.
+ * This cause problem with cache, so driver restore non-secure
+ * access to memory.
+ */
+ reg = readl(&regs->dma_axi_ctrl);
+ reg |= DMA_AXI_CTRL_MARPROT(DMA_AXI_CTRL_NON_SECURE) |
+ DMA_AXI_CTRL_MAWPROT(DMA_AXI_CTRL_NON_SECURE);
+ writel(reg, &regs->dma_axi_ctrl);
+
+ /* enable generic interrupt*/
+ writel(USB_IEN_INIT, &regs->usb_ien);
+ writel(USB_CONF_CLK2OFFDS | USB_CONF_L1DS, &regs->usb_conf);
+
+ cdns3_configure_dmult(priv_dev, NULL);
+
+ cdns3_gadget_pullup(&priv_dev->gadget, 1);
+}
+
+/**
+ * cdns3_gadget_udc_start Gadget start
+ * @gadget: gadget object
+ * @driver: driver which operates on this gadget
+ *
+ * Returns 0 on success, error code elsewhere
+ */
+static int cdns3_gadget_udc_start(struct usb_gadget *gadget,
+ struct usb_gadget_driver *driver)
+{
+ struct cdns3_device *priv_dev = gadget_to_cdns3_device(gadget);
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv_dev->lock, flags);
+ priv_dev->gadget_driver = driver;
+ cdns3_gadget_config(priv_dev);
+ spin_unlock_irqrestore(&priv_dev->lock, flags);
+ return 0;
+}
+
+/**
+ * cdns3_gadget_udc_stop Stops gadget
+ * @gadget: gadget object
+ *
+ * Returns 0
+ */
+static int cdns3_gadget_udc_stop(struct usb_gadget *gadget)
+{
+ struct cdns3_device *priv_dev = gadget_to_cdns3_device(gadget);
+ struct cdns3_endpoint *priv_ep;
+ u32 bEndpointAddress;
+ struct usb_ep *ep;
+ int ret = 0;
+ int val;
+
+ priv_dev->gadget_driver = NULL;
+
+ priv_dev->onchip_used_size = 0;
+ priv_dev->out_mem_is_allocated = 0;
+ priv_dev->gadget.speed = USB_SPEED_UNKNOWN;
+
+ list_for_each_entry(ep, &priv_dev->gadget.ep_list, ep_list) {
+ priv_ep = ep_to_cdns3_ep(ep);
+ bEndpointAddress = priv_ep->num | priv_ep->dir;
+ cdns3_select_ep(priv_dev, bEndpointAddress);
+ writel(EP_CMD_EPRST, &priv_dev->regs->ep_cmd);
+ readl_poll_timeout_atomic(&priv_dev->regs->ep_cmd, val,
+ !(val & EP_CMD_EPRST), 1, 100);
+ }
+
+ /* disable interrupt for device */
+ writel(0, &priv_dev->regs->usb_ien);
+ writel(USB_CONF_DEVDS, &priv_dev->regs->usb_conf);
+
+ return ret;
+}
+
+static const struct usb_gadget_ops cdns3_gadget_ops = {
+ .get_frame = cdns3_gadget_get_frame,
+ .wakeup = cdns3_gadget_wakeup,
+ .set_selfpowered = cdns3_gadget_set_selfpowered,
+ .pullup = cdns3_gadget_pullup,
+ .udc_start = cdns3_gadget_udc_start,
+ .udc_stop = cdns3_gadget_udc_stop,
+ .match_ep = cdns3_gadget_match_ep,
+};
+
+static void cdns3_free_all_eps(struct cdns3_device *priv_dev)
+{
+ int i;
+
+ /* ep0 OUT point to ep0 IN. */
+ priv_dev->eps[16] = NULL;
+
+ for (i = 0; i < CDNS3_ENDPOINTS_MAX_COUNT; i++)
+ if (priv_dev->eps[i]) {
+ cdns3_free_trb_pool(priv_dev->eps[i]);
+ devm_kfree(priv_dev->dev, priv_dev->eps[i]);
+ }
+}
+
+/**
+ * cdns3_init_eps Initializes software endpoints of gadget
+ * @cdns3: extended gadget object
+ *
+ * Returns 0 on success, error code elsewhere
+ */
+static int cdns3_init_eps(struct cdns3_device *priv_dev)
+{
+ u32 ep_enabled_reg, iso_ep_reg;
+ struct cdns3_endpoint *priv_ep;
+ int ep_dir, ep_number;
+ u32 ep_mask;
+ int ret = 0;
+ int i;
+
+ /* Read it from USB_CAP3 to USB_CAP5 */
+ ep_enabled_reg = readl(&priv_dev->regs->usb_cap3);
+ iso_ep_reg = readl(&priv_dev->regs->usb_cap4);
+
+ dev_dbg(priv_dev->dev, "Initializing non-zero endpoints\n");
+
+ for (i = 0; i < CDNS3_ENDPOINTS_MAX_COUNT; i++) {
+ ep_dir = i >> 4; /* i div 16 */
+ ep_number = i & 0xF; /* i % 16 */
+ ep_mask = BIT(i);
+
+ if (!(ep_enabled_reg & ep_mask))
+ continue;
+
+ if (ep_dir && !ep_number) {
+ priv_dev->eps[i] = priv_dev->eps[0];
+ continue;
+ }
+
+ priv_ep = devm_kzalloc(priv_dev->dev, sizeof(*priv_ep),
+ GFP_KERNEL);
+ if (!priv_ep)
+ goto err;
+
+ /* set parent of endpoint object */
+ priv_ep->cdns3_dev = priv_dev;
+ priv_dev->eps[i] = priv_ep;
+ priv_ep->num = ep_number;
+ priv_ep->dir = ep_dir ? USB_DIR_IN : USB_DIR_OUT;
+
+ if (!ep_number) {
+ ret = cdns3_init_ep0(priv_dev, priv_ep);
+ if (ret) {
+ dev_err(priv_dev->dev, "Failed to init ep0\n");
+ goto err;
+ }
+ } else {
+ snprintf(priv_ep->name, sizeof(priv_ep->name), "ep%d%s",
+ ep_number, !!ep_dir ? "in" : "out");
+ priv_ep->endpoint.name = priv_ep->name;
+
+ usb_ep_set_maxpacket_limit(&priv_ep->endpoint,
+ CDNS3_EP_MAX_PACKET_LIMIT);
+ priv_ep->endpoint.max_streams = CDNS3_EP_MAX_STREAMS;
+ priv_ep->endpoint.ops = &cdns3_gadget_ep_ops;
+ if (ep_dir)
+ priv_ep->endpoint.caps.dir_in = 1;
+ else
+ priv_ep->endpoint.caps.dir_out = 1;
+
+ if (iso_ep_reg & ep_mask)
+ priv_ep->endpoint.caps.type_iso = 1;
+
+ priv_ep->endpoint.caps.type_bulk = 1;
+ priv_ep->endpoint.caps.type_int = 1;
+
+ list_add_tail(&priv_ep->endpoint.ep_list,
+ &priv_dev->gadget.ep_list);
+ }
+
+ priv_ep->flags = 0;
+
+ dev_info(priv_dev->dev, "Initialized %s support: %s %s\n",
+ priv_ep->name,
+ priv_ep->endpoint.caps.type_bulk ? "BULK, INT" : "",
+ priv_ep->endpoint.caps.type_iso ? "ISO" : "");
+
+ INIT_LIST_HEAD(&priv_ep->pending_req_list);
+ INIT_LIST_HEAD(&priv_ep->deferred_req_list);
+ INIT_LIST_HEAD(&priv_ep->wa2_descmiss_req_list);
+ }
+
+ return 0;
+err:
+ cdns3_free_all_eps(priv_dev);
+ return -ENOMEM;
+}
+
+void cdns3_gadget_exit(struct cdns3 *cdns)
+{
+ struct cdns3_device *priv_dev;
+
+ priv_dev = cdns->gadget_dev;
+
+ devm_free_irq(cdns->dev, cdns->dev_irq, cdns);
+
+ pm_runtime_mark_last_busy(cdns->dev);
+ pm_runtime_put_autosuspend(cdns->dev);
+
+ usb_del_gadget_udc(&priv_dev->gadget);
+
+ cdns3_free_all_eps(priv_dev);
+
+ while (!list_empty(&priv_dev->aligned_buf_list)) {
+ struct cdns3_aligned_buf *buf;
+
+ buf = cdns3_next_align_buf(&priv_dev->aligned_buf_list);
+ dma_free_coherent(priv_dev->sysdev, buf->size,
+ buf->buf,
+ buf->dma);
+
+ list_del(&buf->list);
+ kfree(buf);
+ }
+
+ dma_free_coherent(priv_dev->sysdev, 8, priv_dev->setup_buf,
+ priv_dev->setup_dma);
+
+ kfree(priv_dev->zlp_buf);
+ kfree(priv_dev);
+ cdns->gadget_dev = NULL;
+ cdns3_drd_switch_gadget(cdns, 0);
+}
+
+static int cdns3_gadget_start(struct cdns3 *cdns)
+{
+ struct cdns3_device *priv_dev;
+ u32 max_speed;
+ int ret;
+
+ priv_dev = kzalloc(sizeof(*priv_dev), GFP_KERNEL);
+ if (!priv_dev)
+ return -ENOMEM;
+
+ cdns->gadget_dev = priv_dev;
+ priv_dev->sysdev = cdns->dev;
+ priv_dev->dev = cdns->dev;
+ priv_dev->regs = cdns->dev_regs;
+
+ device_property_read_u16(priv_dev->dev, "cdns,on-chip-buff-size",
+ &priv_dev->onchip_buffers);
+
+ if (priv_dev->onchip_buffers <= 0) {
+ u32 reg = readl(&priv_dev->regs->usb_cap2);
+
+ priv_dev->onchip_buffers = USB_CAP2_ACTUAL_MEM_SIZE(reg);
+ }
+
+ if (!priv_dev->onchip_buffers)
+ priv_dev->onchip_buffers = 256;
+
+ max_speed = usb_get_maximum_speed(cdns->dev);
+
+ /* Check the maximum_speed parameter */
+ switch (max_speed) {
+ case USB_SPEED_FULL:
+ writel(USB_CONF_SFORCE_FS, &priv_dev->regs->usb_conf);
+ break;
+ case USB_SPEED_HIGH:
+ writel(USB_CONF_USB3DIS, &priv_dev->regs->usb_conf);
+ break;
+ case USB_SPEED_SUPER:
+ break;
+ default:
+ dev_err(cdns->dev, "invalid maximum_speed parameter %d\n",
+ max_speed);
+ /* fall through */
+ case USB_SPEED_UNKNOWN:
+ /* default to superspeed */
+ max_speed = USB_SPEED_SUPER;
+ break;
+ }
+
+ /* fill gadget fields */
+ priv_dev->gadget.max_speed = max_speed;
+ priv_dev->gadget.speed = USB_SPEED_UNKNOWN;
+ priv_dev->gadget.ops = &cdns3_gadget_ops;
+ priv_dev->gadget.name = "usb-ss-gadget";
+ priv_dev->gadget.sg_supported = 1;
+ priv_dev->gadget.quirk_avoids_skb_reserve = 1;
+
+ spin_lock_init(&priv_dev->lock);
+ INIT_WORK(&priv_dev->pending_status_wq,
+ cdns3_pending_setup_status_handler);
+
+ INIT_WORK(&priv_dev->aligned_buf_wq,
+ cdns3_free_aligned_request_buf);
+
+ /* initialize endpoint container */
+ INIT_LIST_HEAD(&priv_dev->gadget.ep_list);
+ INIT_LIST_HEAD(&priv_dev->aligned_buf_list);
+
+ ret = cdns3_init_eps(priv_dev);
+ if (ret) {
+ dev_err(priv_dev->dev, "Failed to create endpoints\n");
+ goto err1;
+ }
+
+ /* allocate memory for setup packet buffer */
+ priv_dev->setup_buf = dma_alloc_coherent(priv_dev->sysdev, 8,
+ &priv_dev->setup_dma, GFP_DMA);
+ if (!priv_dev->setup_buf) {
+ ret = -ENOMEM;
+ goto err2;
+ }
+
+ priv_dev->dev_ver = readl(&priv_dev->regs->usb_cap6);
+
+ dev_dbg(priv_dev->dev, "Device Controller version: %08x\n",
+ readl(&priv_dev->regs->usb_cap6));
+ dev_dbg(priv_dev->dev, "USB Capabilities:: %08x\n",
+ readl(&priv_dev->regs->usb_cap1));
+ dev_dbg(priv_dev->dev, "On-Chip memory configuration: %08x\n",
+ readl(&priv_dev->regs->usb_cap2));
+
+ priv_dev->dev_ver = GET_DEV_BASE_VERSION(priv_dev->dev_ver);
+
+ priv_dev->zlp_buf = kzalloc(CDNS3_EP_ZLP_BUF_SIZE, GFP_KERNEL);
+ if (!priv_dev->zlp_buf) {
+ ret = -ENOMEM;
+ goto err3;
+ }
+
+ /* add USB gadget device */
+ ret = usb_add_gadget_udc(priv_dev->dev, &priv_dev->gadget);
+ if (ret < 0) {
+ dev_err(priv_dev->dev,
+ "Failed to register USB device controller\n");
+ goto err4;
+ }
+
+ return 0;
+err4:
+ kfree(priv_dev->zlp_buf);
+err3:
+ dma_free_coherent(priv_dev->sysdev, 8, priv_dev->setup_buf,
+ priv_dev->setup_dma);
+err2:
+ cdns3_free_all_eps(priv_dev);
+err1:
+ cdns->gadget_dev = NULL;
+ return ret;
+}
+
+static int __cdns3_gadget_init(struct cdns3 *cdns)
+{
+ int ret = 0;
+
+ cdns3_drd_switch_gadget(cdns, 1);
+ pm_runtime_get_sync(cdns->dev);
+
+ ret = cdns3_gadget_start(cdns);
+ if (ret)
+ return ret;
+
+ /*
+ * Because interrupt line can be shared with other components in
+ * driver it can't use IRQF_ONESHOT flag here.
+ */
+ ret = devm_request_threaded_irq(cdns->dev, cdns->dev_irq,
+ cdns3_device_irq_handler,
+ cdns3_device_thread_irq_handler,
+ IRQF_SHARED, dev_name(cdns->dev), cdns);
+
+ if (ret)
+ goto err0;
+
+ return 0;
+err0:
+ cdns3_gadget_exit(cdns);
+ return ret;
+}
+
+static int cdns3_gadget_suspend(struct cdns3 *cdns, bool do_wakeup)
+{
+ struct cdns3_device *priv_dev = cdns->gadget_dev;
+
+ cdns3_disconnect_gadget(priv_dev);
+
+ priv_dev->gadget.speed = USB_SPEED_UNKNOWN;
+ usb_gadget_set_state(&priv_dev->gadget, USB_STATE_NOTATTACHED);
+ cdns3_hw_reset_eps_config(priv_dev);
+
+ /* disable interrupt for device */
+ writel(0, &priv_dev->regs->usb_ien);
+
+ cdns3_gadget_pullup(&priv_dev->gadget, 0);
+
+ return 0;
+}
+
+static int cdns3_gadget_resume(struct cdns3 *cdns, bool hibernated)
+{
+ struct cdns3_device *priv_dev = cdns->gadget_dev;
+
+ if (!priv_dev->gadget_driver)
+ return 0;
+
+ cdns3_gadget_config(priv_dev);
+
+ return 0;
+}
+
+/**
+ * cdns3_gadget_init - initialize device structure
+ *
+ * cdns: cdns3 instance
+ *
+ * This function initializes the gadget.
+ */
+int cdns3_gadget_init(struct cdns3 *cdns)
+{
+ struct cdns3_role_driver *rdrv;
+
+ rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);
+ if (!rdrv)
+ return -ENOMEM;
+
+ rdrv->start = __cdns3_gadget_init;
+ rdrv->stop = cdns3_gadget_exit;
+ rdrv->suspend = cdns3_gadget_suspend;
+ rdrv->resume = cdns3_gadget_resume;
+ rdrv->state = CDNS3_ROLE_STATE_INACTIVE;
+ rdrv->name = "gadget";
+ cdns->roles[USB_ROLE_DEVICE] = rdrv;
+
+ return 0;
+}