| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Pawel Laszczak | 10312 | 74.42% | 14 | 21.88% |
| Jayshri Pawar | 2193 | 15.83% | 1 | 1.56% |
| Peter Chen | 876 | 6.32% | 26 | 40.62% |
| Frank Li | 170 | 1.23% | 4 | 6.25% |
| Sanket Parmar | 167 | 1.21% | 4 | 6.25% |
| Roger Quadros | 53 | 0.38% | 1 | 1.56% |
| Nathan Chancellor | 30 | 0.22% | 1 | 1.56% |
| Lee Jones | 19 | 0.14% | 3 | 4.69% |
| Dinghao Liu | 9 | 0.06% | 1 | 1.56% |
| Jason Yan | 7 | 0.05% | 1 | 1.56% |
| Andrey Strachuk | 6 | 0.04% | 1 | 1.56% |
| Nicolas Boichat | 5 | 0.04% | 1 | 1.56% |
| Gustavo A. R. Silva | 4 | 0.03% | 1 | 1.56% |
| Colin Ian King | 3 | 0.02% | 2 | 3.12% |
| Souptick Joarder | 1 | 0.01% | 1 | 1.56% |
| Baokun Li | 1 | 0.01% | 1 | 1.56% |
| Xu Wang | 1 | 0.01% | 1 | 1.56% |
| Total | 13857 | 64 |
// 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/dmapool.h> #include <linux/iopoll.h> #include "core.h" #include "gadget-export.h" #include "cdns3-gadget.h" #include "cdns3-trace.h" #include "drd.h" static int __cdns3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request, gfp_t gfp_flags); static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep, struct usb_request *request); static int cdns3_ep_run_stream_transfer(struct cdns3_endpoint *priv_ep, struct usb_request *request); /** * cdns3_clear_register_bit - clear bit in given register. * @ptr: address of device controller register to be read and changed * @mask: bits requested to clar */ static void cdns3_clear_register_bit(void __iomem *ptr, u32 mask) { mask = readl(ptr) & ~mask; writel(mask, ptr); } /** * 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 */ static 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 */ static struct cdns3_request *cdns3_next_priv_request(struct list_head *list) { return list_first_entry_or_null(list, struct cdns3_request, list); } /** * cdns3_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); } /** * cdns3_get_tdl - gets current tdl for selected endpoint. * @priv_dev: extended gadget object * * Before calling this function the appropriate endpoint must * be selected by means of cdns3_select_ep function. */ static int cdns3_get_tdl(struct cdns3_device *priv_dev) { if (priv_dev->dev_ver < DEV_VER_V3) return EP_CMD_TDL_GET(readl(&priv_dev->regs->ep_cmd)); else return readl(&priv_dev->regs->ep_tdl); } 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; } 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_pool_free(priv_dev->eps_dma_pool, priv_ep->trb_pool, priv_ep->trb_pool_dma); priv_ep->trb_pool = NULL; } } /** * 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 = TRB_RING_SIZE; int num_trbs = ring_size / TRB_SIZE; struct cdns3_trb *link_trb; if (priv_ep->trb_pool && priv_ep->alloc_ring_size < ring_size) cdns3_free_trb_pool(priv_ep); if (!priv_ep->trb_pool) { priv_ep->trb_pool = dma_pool_alloc(priv_dev->eps_dma_pool, GFP_ATOMIC, &priv_ep->trb_pool_dma); if (!priv_ep->trb_pool) return -ENOMEM; priv_ep->alloc_ring_size = ring_size; } memset(priv_ep->trb_pool, 0, ring_size); priv_ep->num_trbs = num_trbs; if (!priv_ep->num) return 0; /* Initialize the last TRB as Link TRB */ link_trb = (priv_ep->trb_pool + (priv_ep->num_trbs - 1)); if (priv_ep->use_streams) { /* * For stream capable endpoints driver use single correct TRB. * The last trb has zeroed cycle bit */ link_trb->control = 0; } else { link_trb->buffer = cpu_to_le32(TRB_BUFFER(priv_ep->trb_pool_dma)); link_trb->control = cpu_to_le32(TRB_CYCLE | TRB_TYPE(TRB_LINK) | TRB_TOGGLE); } return 0; } /** * 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) { int i; 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; priv_dev->using_streams = 0; for (i = 0; i < CDNS3_ENDPOINTS_MAX_COUNT; i++) if (priv_dev->eps[i]) priv_dev->eps[i]->flags &= ~EP_CONFIGURED; } /** * 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); } /** * 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; u8 pending_empty = list_empty(&priv_ep->pending_req_list); /* * If the last pending transfer is INTERNAL * OR streams are enabled for this endpoint * do NOT start new transfer till the last one is pending */ if (!pending_empty) { struct cdns3_request *priv_req; request = cdns3_next_request(&priv_ep->pending_req_list); priv_req = to_cdns3_request(request); if ((priv_req->flags & REQUEST_INTERNAL) || (priv_ep->flags & EP_TDLCHK_EN) || priv_ep->use_streams) { dev_dbg(priv_dev->dev, "Blocking external request\n"); return ret; } } while (!list_empty(&priv_ep->deferred_req_list)) { request = cdns3_next_request(&priv_ep->deferred_req_list); if (!priv_ep->use_streams) { ret = cdns3_ep_run_transfer(priv_ep, request); } else { priv_ep->stream_sg_idx = 0; ret = cdns3_ep_run_stream_transfer(priv_ep, request); } if (ret) return ret; list_move_tail(&request->list, &priv_ep->pending_req_list); if (request->stream_id != 0 || (priv_ep->flags & EP_TDLCHK_EN)) break; } 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, priv_ep, 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) static void __cdns3_descmiss_copy_data(struct usb_request *request, struct usb_request *descmiss_req) { int length = request->actual + descmiss_req->actual; struct scatterlist *s = request->sg; if (!s) { 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; } } else { if (length <= sg_dma_len(s)) { void *p = phys_to_virt(sg_dma_address(s)); memcpy(&((u8 *)p)[request->actual], descmiss_req->buf, descmiss_req->actual); request->actual = length; } else { request->status = -ENOMEM; } } } /** * 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; 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; request->status = descmiss_req->status; __cdns3_descmiss_copy_data(request, descmiss_req); 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; } } static 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; /* unmap the gadget request before copying data */ usb_gadget_unmap_request_by_dev(priv_dev->sysdev, req, priv_ep->dir); 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 */ /* re-map the gadget request buffer*/ usb_gadget_map_request_by_dev(priv_dev->sysdev, req, usb_endpoint_dir_in(priv_ep->endpoint.desc)); 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; } static 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); list_del_init(&priv_req->list); cdns3_gadget_ep_free_request(&priv_ep->endpoint, &priv_req->request); --priv_ep->wa2_counter; if (!chain) break; } } /** * cdns3_wa2_descmissing_packet - handles descriptor missing event. * @priv_ep: 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; u8 pending_empty = list_empty(&priv_ep->pending_req_list); /* check for pending transfer */ if (!pending_empty) { trace_cdns3_wa2(priv_ep, "Ignoring Descriptor missing IRQ\n"); return; } 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) { trace_cdns3_wa2(priv_ep, "WA2 overflow\n"); 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"); } static void cdns3_wa2_reset_tdl(struct cdns3_device *priv_dev) { u16 tdl = EP_CMD_TDL_GET(readl(&priv_dev->regs->ep_cmd)); if (tdl) { u16 reset_val = EP_CMD_TDL_MAX + 1 - tdl; writel(EP_CMD_TDL_SET(reset_val) | EP_CMD_STDL, &priv_dev->regs->ep_cmd); } } static void cdns3_wa2_check_outq_status(struct cdns3_device *priv_dev) { u32 ep_sts_reg; /* select EP0-out */ cdns3_select_ep(priv_dev, 0); ep_sts_reg = readl(&priv_dev->regs->ep_sts); if (EP_STS_OUTQ_VAL(ep_sts_reg)) { u32 outq_ep_num = EP_STS_OUTQ_NO(ep_sts_reg); struct cdns3_endpoint *outq_ep = priv_dev->eps[outq_ep_num]; if ((outq_ep->flags & EP_ENABLED) && !(outq_ep->use_streams) && outq_ep->type != USB_ENDPOINT_XFER_ISOC && outq_ep_num) { u8 pending_empty = list_empty(&outq_ep->pending_req_list); if ((outq_ep->flags & EP_QUIRK_EXTRA_BUF_DET) || (outq_ep->flags & EP_QUIRK_EXTRA_BUF_EN) || !pending_empty) { } else { u32 ep_sts_en_reg; u32 ep_cmd_reg; cdns3_select_ep(priv_dev, outq_ep->num | outq_ep->dir); ep_sts_en_reg = readl(&priv_dev->regs->ep_sts_en); ep_cmd_reg = readl(&priv_dev->regs->ep_cmd); outq_ep->flags |= EP_TDLCHK_EN; cdns3_set_register_bit(&priv_dev->regs->ep_cfg, EP_CFG_TDL_CHK); cdns3_wa2_enable_detection(priv_dev, outq_ep, ep_sts_en_reg); writel(ep_sts_en_reg, &priv_dev->regs->ep_sts_en); /* reset tdl value to zero */ cdns3_wa2_reset_tdl(priv_dev); /* * Memory barrier - Reset tdl before ringing the * doorbell. */ wmb(); if (EP_CMD_DRDY & ep_cmd_reg) { trace_cdns3_wa2(outq_ep, "Enabling WA2 skipping doorbell\n"); } else { trace_cdns3_wa2(outq_ep, "Enabling WA2 ringing doorbell\n"); /* * ring doorbell to generate DESCMIS irq */ writel(EP_CMD_DRDY, &priv_dev->regs->ep_cmd); } } } } } /** * 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) { /* Make DMA buffer CPU accessible */ dma_sync_single_for_cpu(priv_dev->sysdev, priv_req->aligned_buf->dma, priv_req->aligned_buf->size, priv_req->aligned_buf->dir); memcpy(request->buf, priv_req->aligned_buf->buf, request->length); } priv_req->flags &= ~(REQUEST_PENDING | REQUEST_UNALIGNED); /* All TRBs have finished, clear the counter */ priv_req->finished_trb = 0; 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); } static 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 | cpu_to_le32(0x1); } else { priv_ep->wa1_trb->control = priv_ep->wa1_trb->control & cpu_to_le32(~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_noncoherent(priv_dev->sysdev, buf->size, buf->buf, buf->dma, buf->dir); 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->dir = usb_endpoint_dir_in(priv_ep->endpoint.desc) ? DMA_TO_DEVICE : DMA_FROM_DEVICE; buf->buf = dma_alloc_noncoherent(priv_dev->sysdev, buf->size, &buf->dma, buf->dir, 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) { /* Make DMA buffer CPU accessible */ dma_sync_single_for_cpu(priv_dev->sysdev, buf->dma, buf->size, buf->dir); memcpy(buf->buf, priv_req->request.buf, priv_req->request.length); } /* Transfer DMA buffer ownership back to device */ dma_sync_single_for_device(priv_dev->sysdev, buf->dma, buf->size, buf->dir); 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); } static int cdns3_ep_run_stream_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; int address; u32 control; u32 length; u32 tdl; unsigned int sg_idx = priv_ep->stream_sg_idx; 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; /* For stream capable endpoints driver use only single TD. */ trb = priv_ep->trb_pool + priv_ep->enqueue; priv_req->start_trb = priv_ep->enqueue; priv_req->end_trb = priv_req->start_trb; priv_req->trb = trb; cdns3_select_ep(priv_ep->cdns3_dev, address); control = TRB_TYPE(TRB_NORMAL) | TRB_CYCLE | TRB_STREAM_ID(priv_req->request.stream_id) | TRB_ISP; if (!request->num_sgs) { trb->buffer = cpu_to_le32(TRB_BUFFER(trb_dma)); length = request->length; } else { trb->buffer = cpu_to_le32(TRB_BUFFER(request->sg[sg_idx].dma_address)); length = request->sg[sg_idx].length; } tdl = DIV_ROUND_UP(length, priv_ep->endpoint.maxpacket); trb->length = cpu_to_le32(TRB_BURST_LEN(16) | TRB_LEN(length)); /* * For DEV_VER_V2 controller version we have enabled * USB_CONF2_EN_TDL_TRB in DMULT configuration. * This enables TDL calculation based on TRB, hence setting TDL in TRB. */ if (priv_dev->dev_ver >= DEV_VER_V2) { if (priv_dev->gadget.speed == USB_SPEED_SUPER) trb->length |= cpu_to_le32(TRB_TDL_SS_SIZE(tdl)); } priv_req->flags |= REQUEST_PENDING; trb->control = cpu_to_le32(control); trace_cdns3_prepare_trb(priv_ep, priv_req->trb); /* * Memory barrier - Cycle Bit must be set before trb->length and * trb->buffer fields. */ wmb(); /* always first element */ writel(EP_TRADDR_TRADDR(priv_ep->trb_pool_dma), &priv_dev->regs->ep_traddr); if (!(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); priv_ep->prime_flag = false; /* * Controller version DEV_VER_V2 tdl calculation * is based on TRB */ if (priv_dev->dev_ver < DEV_VER_V2) writel(EP_CMD_TDL_SET(tdl) | EP_CMD_STDL, &priv_dev->regs->ep_cmd); else if (priv_dev->dev_ver > DEV_VER_V2) writel(tdl, &priv_dev->regs->ep_tdl); priv_ep->last_stream_id = priv_req->request.stream_id; writel(EP_CMD_DRDY, &priv_dev->regs->ep_cmd); writel(EP_CMD_ERDY_SID(priv_req->request.stream_id) | EP_CMD_ERDY, &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; } static void cdns3_rearm_drdy_if_needed(struct cdns3_endpoint *priv_ep) { struct cdns3_device *priv_dev = priv_ep->cdns3_dev; if (priv_dev->dev_ver < DEV_VER_V3) return; if (readl(&priv_dev->regs->ep_sts) & EP_STS_TRBERR) { writel(EP_STS_TRBERR, &priv_dev->regs->ep_sts); writel(EP_CMD_DRDY, &priv_dev->regs->ep_cmd); } } /** * cdns3_ep_run_transfer - start transfer on no-default endpoint hardware * @priv_ep: endpoint object * @request: request object * * Returns zero on success or negative value on failure */ static 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; struct cdns3_trb *link_trb = NULL; dma_addr_t trb_dma; u32 togle_pcs = 1; int sg_iter = 0; int num_trb; int address; u32 control; int pcs; u16 total_tdl = 0; struct scatterlist *s = NULL; bool sg_supported = !!(request->num_mapped_sgs); if (priv_ep->type == USB_ENDPOINT_XFER_ISOC) num_trb = priv_ep->interval; else num_trb = sg_supported ? request->num_mapped_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)) { 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 = cpu_to_le32(((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); if (sg_supported) s = request->sg; /* set incorrect Cycle Bit for first trb*/ control = priv_ep->pcs ? 0 : TRB_CYCLE; trb->length = 0; if (priv_dev->dev_ver >= DEV_VER_V2) { u16 td_size; td_size = DIV_ROUND_UP(request->length, priv_ep->endpoint.maxpacket); if (priv_dev->gadget.speed == USB_SPEED_SUPER) trb->length = cpu_to_le32(TRB_TDL_SS_SIZE(td_size)); else control |= TRB_TDL_HS_SIZE(td_size); } do { u32 length; /* fill TRB */ control |= TRB_TYPE(TRB_NORMAL); if (sg_supported) { trb->buffer = cpu_to_le32(TRB_BUFFER(sg_dma_address(s))); length = sg_dma_len(s); } else { trb->buffer = cpu_to_le32(TRB_BUFFER(trb_dma)); length = request->length; } if (priv_ep->flags & EP_TDLCHK_EN) total_tdl += DIV_ROUND_UP(length, priv_ep->endpoint.maxpacket); trb->length |= cpu_to_le32(TRB_BURST_LEN(priv_ep->trb_burst_size) | TRB_LEN(length)); 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 = cpu_to_le32(control); else priv_req->trb->control = cpu_to_le32(control); if (sg_supported) { trb->control |= cpu_to_le32(TRB_ISP); /* Don't set chain bit for last TRB */ if (sg_iter < num_trb - 1) trb->control |= cpu_to_le32(TRB_CHAIN); s = sg_next(s); } 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; trb->length = 0; } while (sg_iter < num_trb); trb = priv_req->trb; priv_req->flags |= REQUEST_PENDING; priv_req->num_of_trb = num_trb; if (sg_iter == 1) trb->control |= cpu_to_le32(TRB_IOC | TRB_ISP); if (priv_dev->dev_ver < DEV_VER_V2 && (priv_ep->flags & EP_TDLCHK_EN)) { u16 tdl = total_tdl; u16 old_tdl = EP_CMD_TDL_GET(readl(&priv_dev->regs->ep_cmd)); if (tdl > EP_CMD_TDL_MAX) { tdl = EP_CMD_TDL_MAX; priv_ep->pending_tdl = total_tdl - EP_CMD_TDL_MAX; } if (old_tdl < tdl) { tdl -= old_tdl; writel(EP_CMD_TDL_SET(tdl) | EP_CMD_STDL, &priv_dev->regs->ep_cmd); } } /* * 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 ^ cpu_to_le32(1); if (priv_dev->dev_ver <= DEV_VER_V2) cdns3_wa1_tray_restore_cycle_bit(priv_dev, priv_ep); if (num_trb > 1) { int i = 0; while (i < num_trb) { trace_cdns3_prepare_trb(priv_ep, trb + i); if (trb + i == link_trb) { trb = priv_ep->trb_pool; num_trb = num_trb - i; i = 0; } else { i++; } } } else { 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); cdns3_rearm_drdy_if_needed(priv_ep); 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; if (priv_dev->hw_configured_flag) return; writel(USB_CONF_CFGSET, &priv_dev->regs->usb_conf); cdns3_set_register_bit(&priv_dev->regs->usb_conf, USB_CONF_U1EN | USB_CONF_U2EN); 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_allow_enable_l1(priv_dev, 1); } /** * cdns3_trb_handled - check whether trb 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, we check if the TRB between the ST and ET. * Then, we check if cycle bit for index priv_ep->dequeue * is correct. * * some rules: * 1. priv_ep->dequeue never equals to 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. * * At below two cases, the request have been handled. * Case 1 - priv_ep->dequeue < current_index * SR ... EQ ... DQ ... CI ... ER * SR ... DQ ... CI ... EQ ... ER * * Case 2 - priv_ep->dequeue > current_index * This situation takes place when CI go through the LINK TRB at the end of * transfer ring. * SR ... CI ... EQ ... DQ ... ER */ static bool cdns3_trb_handled(struct cdns3_endpoint *priv_ep, struct cdns3_request *priv_req) { struct cdns3_device *priv_dev = priv_ep->cdns3_dev; struct cdns3_trb *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); /* current trb doesn't belong to this request */ if (priv_req->start_trb < priv_req->end_trb) { if (priv_ep->dequeue > priv_req->end_trb) goto finish; if (priv_ep->dequeue < priv_req->start_trb) goto finish; } if ((priv_req->start_trb > priv_req->end_trb) && (priv_ep->dequeue > priv_req->end_trb) && (priv_ep->dequeue < priv_req->start_trb)) goto finish; if ((priv_req->start_trb == priv_req->end_trb) && (priv_ep->dequeue != priv_req->end_trb)) goto finish; trb = &priv_ep->trb_pool[priv_ep->dequeue]; if ((le32_to_cpu(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; handled = 1; } else if (priv_ep->dequeue > current_index) { 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; bool request_handled = false; bool transfer_end = false; while (!list_empty(&priv_ep->pending_req_list)) { request = cdns3_next_request(&priv_ep->pending_req_list); priv_req = to_cdns3_request(request); trb = priv_ep->trb_pool + priv_ep->dequeue; /* The TRB was changed as link TRB, and the request was handled at ep_dequeue */ while (TRB_FIELD_TO_TYPE(le32_to_cpu(trb->control)) == TRB_LINK) { trace_cdns3_complete_trb(priv_ep, trb); cdns3_ep_inc_deq(priv_ep); trb = priv_ep->trb_pool + priv_ep->dequeue; } if (!request->stream_id) { /* 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); while (cdns3_trb_handled(priv_ep, priv_req)) { priv_req->finished_trb++; if (priv_req->finished_trb >= priv_req->num_of_trb) request_handled = true; trb = priv_ep->trb_pool + priv_ep->dequeue; trace_cdns3_complete_trb(priv_ep, trb); if (!transfer_end) request->actual += TRB_LEN(le32_to_cpu(trb->length)); if (priv_req->num_of_trb > 1 && le32_to_cpu(trb->control) & TRB_SMM && le32_to_cpu(trb->control) & TRB_CHAIN) transfer_end = true; cdns3_ep_inc_deq(priv_ep); } if (request_handled) { cdns3_gadget_giveback(priv_ep, priv_req, 0); request_handled = false; transfer_end = false; } else { goto prepare_next_td; } if (priv_ep->type != USB_ENDPOINT_XFER_ISOC && TRBS_PER_SEGMENT == 2) break; } else { /* 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); trb = priv_ep->trb_pool; 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)); if (!request->num_sgs || (request->num_sgs == (priv_ep->stream_sg_idx + 1))) { priv_ep->stream_sg_idx = 0; cdns3_gadget_giveback(priv_ep, priv_req, 0); } else { priv_ep->stream_sg_idx++; cdns3_ep_run_stream_transfer(priv_ep, request); } 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)); } } static void cdns3_reprogram_tdl(struct cdns3_endpoint *priv_ep) { u16 tdl = priv_ep->pending_tdl; struct cdns3_device *priv_dev = priv_ep->cdns3_dev; if (tdl > EP_CMD_TDL_MAX) { tdl = EP_CMD_TDL_MAX; priv_ep->pending_tdl -= EP_CMD_TDL_MAX; } else { priv_ep->pending_tdl = 0; } writel(EP_CMD_TDL_SET(tdl) | EP_CMD_STDL, &priv_dev->regs->ep_cmd); } /** * 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; struct usb_request *deferred_request; struct usb_request *pending_request; u32 tdl = 0; 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_PRIME) && priv_ep->use_streams) { bool dbusy = !!(ep_sts_reg & EP_STS_DBUSY); tdl = cdns3_get_tdl(priv_dev); /* * Continue the previous transfer: * There is some racing between ERDY and PRIME. The device send * ERDY and almost in the same time Host send PRIME. It cause * that host ignore the ERDY packet and driver has to send it * again. */ if (tdl && (dbusy || !EP_STS_BUFFEMPTY(ep_sts_reg) || EP_STS_HOSTPP(ep_sts_reg))) { writel(EP_CMD_ERDY | EP_CMD_ERDY_SID(priv_ep->last_stream_id), &priv_dev->regs->ep_cmd); ep_sts_reg &= ~(EP_STS_MD_EXIT | EP_STS_IOC); } else { priv_ep->prime_flag = true; pending_request = cdns3_next_request(&priv_ep->pending_req_list); deferred_request = cdns3_next_request(&priv_ep->deferred_req_list); if (deferred_request && !pending_request) { cdns3_start_all_request(priv_dev, priv_ep); } } } 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; priv_ep->flags |= EP_UPDATE_EP_TRBADDR; } 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) || (ep_sts_reg & EP_STS_IOT)) { 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; } if (!priv_ep->use_streams) { if ((ep_sts_reg & EP_STS_IOC) || (ep_sts_reg & EP_STS_ISP)) { cdns3_transfer_completed(priv_dev, priv_ep); } else if ((priv_ep->flags & EP_TDLCHK_EN) & priv_ep->pending_tdl) { /* handle IOT with pending tdl */ cdns3_reprogram_tdl(priv_ep); } } else if (priv_ep->dir == USB_DIR_OUT) { priv_ep->ep_sts_pending |= ep_sts_reg; } else if (ep_sts_reg & EP_STS_IOT) { cdns3_transfer_completed(priv_dev, priv_ep); } } /* * MD_EXIT interrupt sets when stream capable endpoint exits * from MOVE DATA state of Bulk IN/OUT stream protocol state machine */ if (priv_ep->dir == USB_DIR_OUT && (ep_sts_reg & EP_STS_MD_EXIT) && (priv_ep->ep_sts_pending & EP_STS_IOT) && priv_ep->use_streams) { priv_ep->ep_sts_pending = 0; 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) priv_dev->gadget_driver->disconnect(&priv_dev->gadget); } /** * 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) __must_hold(&priv_dev->lock) { 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)) { spin_unlock(&priv_dev->lock); cdns3_disconnect_gadget(priv_dev); spin_lock(&priv_dev->lock); 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 = data; struct cdns *cdns = dev_get_drvdata(priv_dev->dev); irqreturn_t ret = IRQ_NONE; u32 reg; if (cdns->in_lpm) return ret; /* 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 = data; irqreturn_t ret = IRQ_NONE; unsigned long flags; unsigned int bit; unsigned long reg; 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, ®, sizeof(u32) * BITS_PER_BYTE) { cdns3_check_ep_interrupt_proceed(priv_dev->eps[bit]); ret = IRQ_HANDLED; } if (priv_dev->dev_ver < DEV_VER_V2 && priv_dev->using_streams) cdns3_wa2_check_outq_status(priv_dev); 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; } static 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, ®s->usb_conf); if (priv_dev->dev_ver == DEV_VER_V2) writel(USB_CONF2_EN_TDL_TRB, ®s->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 && !priv_ep->dir) { cdns3_set_register_bit(®s->tdl_from_trb, mask); cdns3_set_register_bit(®s->tdl_beh, mask); cdns3_set_register_bit(®s->tdl_beh2, mask); cdns3_set_register_bit(®s->dma_adv_td, mask); } if (priv_ep->type == USB_ENDPOINT_XFER_ISOC && !priv_ep->dir) cdns3_set_register_bit(®s->tdl_from_trb, mask); cdns3_set_register_bit(®s->dtrans, mask); } } /** * cdns3_ep_config - Configure hardware endpoint * @priv_ep: extended endpoint object * @enable: set EP_CFG_ENABLE bit in ep_cfg register. */ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable) { 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 = priv_dev->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) 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) ep_cfg |= EP_CFG_TDL_CHK; break; default: ep_cfg = EP_CFG_EPTYPE(USB_ENDPOINT_XFER_ISOC); mult = priv_dev->ep_iso_burst - 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 = priv_dev->ep_iso_burst - 1; buffering = (mult + 1) * (maxburst + 1); if (priv_ep->interval > 1) buffering++; } else { maxburst = priv_dev->ep_buf_size - 1; } break; default: /* all other speed are not supported */ return -EINVAL; } 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; mult = min_t(u8, mult, EP_CFG_MULT_MAX); buffering = min_t(u8, buffering, EP_CFG_BUFFERING_MAX); maxburst = min_t(u8, maxburst, EP_CFG_MAXBURST_MAX); /* onchip buffer is only allocated before configuration */ if (!priv_dev->hw_configured_flag) { 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 ret; } } if (enable) ep_cfg |= EP_CFG_ENABLE; if (priv_ep->use_streams && priv_dev->gadget.speed >= USB_SPEED_SUPER) { if (priv_dev->dev_ver >= DEV_VER_V3) { u32 mask = BIT(priv_ep->num + (priv_ep->dir ? 16 : 0)); /* * Stream capable endpoints are handled by using ep_tdl * register. Other endpoints use TDL from TRB feature. */ cdns3_clear_register_bit(&priv_dev->regs->tdl_from_trb, mask); } /* Enable Stream Bit TDL chk and SID chk */ ep_cfg |= EP_CFG_STREAM_EN | EP_CFG_TDL_CHK | EP_CFG_SID_CHK; } 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); priv_ep->flags |= EP_CONFIGURED; dev_dbg(priv_dev->dev, "Configure %s: with val %08x\n", priv_ep->name, ep_cfg); return 0; } /* 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; const struct usb_ss_ep_comp_descriptor *comp_desc; u32 reg = EP_STS_EN_TRBERREN; u32 bEndpointAddress; unsigned long flags; int enable = 1; int ret = 0; int val; if (!ep) { pr_debug("usbss: ep not configured?\n"); return -EINVAL; } priv_ep = ep_to_cdns3_ep(ep); priv_dev = priv_ep->cdns3_dev; comp_desc = priv_ep->endpoint.comp_desc; if (!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; } bEndpointAddress = priv_ep->num | priv_ep->dir; cdns3_select_ep(priv_dev, bEndpointAddress); /* * 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 (usb_ss_max_streams(comp_desc) && usb_endpoint_xfer_bulk(desc)) { /* * Enable stream support (SS mode) related interrupts * in EP_STS_EN Register */ if (priv_dev->gadget.speed >= USB_SPEED_SUPER) { reg |= EP_STS_EN_IOTEN | EP_STS_EN_PRIMEEEN | EP_STS_EN_SIDERREN | EP_STS_EN_MD_EXITEN | EP_STS_EN_STREAMREN; priv_ep->use_streams = true; ret = cdns3_ep_config(priv_ep, enable); priv_dev->using_streams |= true; } } else { ret = cdns3_ep_config(priv_ep, enable); } if (ret) 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); 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; priv_ep->use_streams = false; 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); /* * For stream capable endpoint if prime irq flag is set then only start * request. * 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 (!request->stream_id) { 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); } else { if (priv_dev->hw_configured_flag && priv_ep->prime_flag) 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; struct usb_request *req, *req_temp; struct cdns3_request *priv_req; struct cdns3_trb *link_trb; u8 req_on_hw_ring = 0; unsigned long flags; int ret = 0; int val; if (!ep || !request || !ep->desc) return -EINVAL; priv_dev = priv_ep->cdns3_dev; 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) { req_on_hw_ring = 1; 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: link_trb = priv_req->trb; /* Update ring only if removed request is on pending_req_list list */ if (req_on_hw_ring && link_trb) { /* Stop DMA */ writel(EP_CMD_DFLUSH, &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); link_trb->buffer = cpu_to_le32(TRB_BUFFER(priv_ep->trb_pool_dma + ((priv_req->end_trb + 1) * TRB_SIZE))); link_trb->control = cpu_to_le32((le32_to_cpu(link_trb->control) & TRB_CYCLE) | TRB_TYPE(TRB_LINK) | TRB_CHAIN); if (priv_ep->wa1_trb == priv_req->trb) cdns3_wa1_restore_cycle_bit(priv_ep); } cdns3_gadget_giveback(priv_ep, priv_req, -ECONNRESET); req = cdns3_next_request(&priv_ep->pending_req_list); if (req) cdns3_rearm_transfer(priv_ep, 1); 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 * @priv_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 * @priv_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; struct cdns3_request *priv_req; struct cdns3_trb *trb = NULL; struct cdns3_trb trb_tmp; int ret; int val; trace_cdns3_halt(priv_ep, 0, 0); request = cdns3_next_request(&priv_ep->pending_req_list); if (request) { priv_req = to_cdns3_request(request); trb = priv_req->trb; if (trb) { trb_tmp = *trb; trb->control = trb->control ^ cpu_to_le32(TRB_CYCLE); } } 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); if (request) { if (trb) *trb = trb_tmp; 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(~0, &priv_dev->regs->ep_ists); writel(~0, &priv_dev->regs->usb_ists); 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, ®s->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(®s->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, ®s->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(®s->dma_axi_ctrl); reg |= DMA_AXI_CTRL_MARPROT(DMA_AXI_CTRL_NON_SECURE) | DMA_AXI_CTRL_MAWPROT(DMA_AXI_CTRL_NON_SECURE); writel(reg, ®s->dma_axi_ctrl); /* enable generic interrupt*/ writel(USB_IEN_INIT, ®s->usb_ien); writel(USB_CONF_CLK2OFFDS | USB_CONF_L1DS, ®s->usb_conf); /* keep Fast Access bit */ writel(PUSB_PWR_FST_REG_ACCESS, &priv_dev->regs->usb_pwr); cdns3_configure_dmult(priv_dev, NULL); } /** * 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; enum usb_device_speed max_speed = driver->max_speed; spin_lock_irqsave(&priv_dev->lock, flags); priv_dev->gadget_driver = driver; /* limit speed if necessary */ max_speed = min(driver->max_speed, gadget->max_speed); switch (max_speed) { case USB_SPEED_FULL: writel(USB_CONF_SFORCE_FS, &priv_dev->regs->usb_conf); writel(USB_CONF_USB3DIS, &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(priv_dev->dev, "invalid maximum_speed parameter %d\n", max_speed); fallthrough; case USB_SPEED_UNKNOWN: /* default to superspeed */ max_speed = USB_SPEED_SUPER; break; } 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 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); priv_ep->flags &= ~EP_CLAIMED; } /* disable interrupt for device */ writel(0, &priv_dev->regs->usb_ien); writel(0, &priv_dev->regs->usb_pwr); writel(USB_CONF_DEVDS, &priv_dev->regs->usb_conf); return 0; } /** * cdns3_gadget_check_config - ensure cdns3 can support the USB configuration * @gadget: pointer to the USB gadget * * Used to record the maximum number of endpoints being used in a USB composite * device. (across all configurations) This is to be used in the calculation * of the TXFIFO sizes when resizing internal memory for individual endpoints. * It will help ensured that the resizing logic reserves enough space for at * least one max packet. */ static int cdns3_gadget_check_config(struct usb_gadget *gadget) { struct cdns3_device *priv_dev = gadget_to_cdns3_device(gadget); struct usb_ep *ep; int n_in = 0; int total; list_for_each_entry(ep, &gadget->ep_list, ep_list) { if (ep->claimed && (ep->address & USB_DIR_IN)) n_in++; } /* 2KB are reserved for EP0, 1KB for out*/ total = 2 + n_in + 1; if (total > priv_dev->onchip_buffers) return -ENOMEM; priv_dev->ep_buf_size = priv_dev->ep_iso_burst = (priv_dev->onchip_buffers - 2) / (n_in + 1); return 0; } 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, .check_config = cdns3_gadget_check_config, }; 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 * @priv_dev: 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_dbg(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; } static void cdns3_gadget_release(struct device *dev) { struct cdns3_device *priv_dev = container_of(dev, struct cdns3_device, gadget.dev); kfree(priv_dev); } static void cdns3_gadget_exit(struct cdns *cdns) { struct cdns3_device *priv_dev; priv_dev = cdns->gadget_dev; pm_runtime_mark_last_busy(cdns->dev); pm_runtime_put_autosuspend(cdns->dev); usb_del_gadget(&priv_dev->gadget); devm_free_irq(cdns->dev, cdns->dev_irq, priv_dev); 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_noncoherent(priv_dev->sysdev, buf->size, buf->buf, buf->dma, buf->dir); list_del(&buf->list); kfree(buf); } dma_free_coherent(priv_dev->sysdev, 8, priv_dev->setup_buf, priv_dev->setup_dma); dma_pool_destroy(priv_dev->eps_dma_pool); kfree(priv_dev->zlp_buf); usb_put_gadget(&priv_dev->gadget); cdns->gadget_dev = NULL; cdns_drd_gadget_off(cdns); } static int cdns3_gadget_start(struct cdns *cdns) { struct cdns3_device *priv_dev; u32 max_speed; int ret; priv_dev = kzalloc(sizeof(*priv_dev), GFP_KERNEL); if (!priv_dev) return -ENOMEM; usb_initialize_gadget(cdns->dev, &priv_dev->gadget, cdns3_gadget_release); 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: case USB_SPEED_HIGH: case USB_SPEED_SUPER: break; default: dev_err(cdns->dev, "invalid maximum_speed parameter %d\n", max_speed); fallthrough; 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.quirk_avoids_skb_reserve = 1; priv_dev->gadget.irq = cdns->dev_irq; 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); priv_dev->eps_dma_pool = dma_pool_create("cdns3_eps_dma_pool", priv_dev->sysdev, TRB_RING_SIZE, 8, 0); if (!priv_dev->eps_dma_pool) { dev_err(priv_dev->dev, "Failed to create TRB dma pool\n"); ret = -ENOMEM; goto err1; } 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); if (priv_dev->dev_ver >= DEV_VER_V2) priv_dev->gadget.sg_supported = 1; 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(&priv_dev->gadget); if (ret < 0) { dev_err(priv_dev->dev, "Failed to add gadget\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: dma_pool_destroy(priv_dev->eps_dma_pool); usb_put_gadget(&priv_dev->gadget); cdns->gadget_dev = NULL; return ret; } static int __cdns3_gadget_init(struct cdns *cdns) { int ret = 0; /* Ensure 32-bit DMA Mask in case we switched back from Host mode */ ret = dma_set_mask_and_coherent(cdns->dev, DMA_BIT_MASK(32)); if (ret) { dev_err(cdns->dev, "Failed to set dma mask: %d\n", ret); return ret; } cdns_drd_gadget_on(cdns); pm_runtime_get_sync(cdns->dev); ret = cdns3_gadget_start(cdns); if (ret) { pm_runtime_put_sync(cdns->dev); 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->gadget_dev); if (ret) goto err0; return 0; err0: cdns3_gadget_exit(cdns); return ret; } static int cdns3_gadget_suspend(struct cdns *cdns, bool do_wakeup) __must_hold(&cdns->lock) { struct cdns3_device *priv_dev = cdns->gadget_dev; spin_unlock(&cdns->lock); cdns3_disconnect_gadget(priv_dev); spin_lock(&cdns->lock); 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); return 0; } static int cdns3_gadget_resume(struct cdns *cdns, bool hibernated) { struct cdns3_device *priv_dev = cdns->gadget_dev; if (!priv_dev->gadget_driver) return 0; cdns3_gadget_config(priv_dev); if (hibernated) writel(USB_CONF_DEVEN, &priv_dev->regs->usb_conf); return 0; } /** * cdns3_gadget_init - initialize device structure * * @cdns: cdns instance * * This function initializes the gadget. */ int cdns3_gadget_init(struct cdns *cdns) { struct cdns_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 = CDNS_ROLE_STATE_INACTIVE; rdrv->name = "gadget"; cdns->roles[USB_ROLE_DEVICE] = rdrv; return 0; }
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