/** * Copyright (c) 2011 Samsung Electronics Co., Ltd. * http://www.samsung.com * * Copyright 2008 Openmoko, Inc. * Copyright 2008 Simtec Electronics * Ben Dooks * http://armlinux.simtec.co.uk/ * * S3C USB2.0 High-speed / OtG driver * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "core.h" #include "hw.h" /* conversion functions */ static inline struct s3c_hsotg_req *our_req(struct usb_request *req) { return container_of(req, struct s3c_hsotg_req, req); } static inline struct s3c_hsotg_ep *our_ep(struct usb_ep *ep) { return container_of(ep, struct s3c_hsotg_ep, ep); } static inline struct dwc2_hsotg *to_hsotg(struct usb_gadget *gadget) { return container_of(gadget, struct dwc2_hsotg, gadget); } static inline void __orr32(void __iomem *ptr, u32 val) { writel(readl(ptr) | val, ptr); } static inline void __bic32(void __iomem *ptr, u32 val) { writel(readl(ptr) & ~val, ptr); } static inline struct s3c_hsotg_ep *index_to_ep(struct dwc2_hsotg *hsotg, u32 ep_index, u32 dir_in) { if (dir_in) return hsotg->eps_in[ep_index]; else return hsotg->eps_out[ep_index]; } /* forward declaration of functions */ static void s3c_hsotg_dump(struct dwc2_hsotg *hsotg); /** * using_dma - return the DMA status of the driver. * @hsotg: The driver state. * * Return true if we're using DMA. * * Currently, we have the DMA support code worked into everywhere * that needs it, but the AMBA DMA implementation in the hardware can * only DMA from 32bit aligned addresses. This means that gadgets such * as the CDC Ethernet cannot work as they often pass packets which are * not 32bit aligned. * * Unfortunately the choice to use DMA or not is global to the controller * and seems to be only settable when the controller is being put through * a core reset. This means we either need to fix the gadgets to take * account of DMA alignment, or add bounce buffers (yuerk). * * g_using_dma is set depending on dts flag. */ static inline bool using_dma(struct dwc2_hsotg *hsotg) { return hsotg->g_using_dma; } /** * s3c_hsotg_en_gsint - enable one or more of the general interrupt * @hsotg: The device state * @ints: A bitmask of the interrupts to enable */ static void s3c_hsotg_en_gsint(struct dwc2_hsotg *hsotg, u32 ints) { u32 gsintmsk = readl(hsotg->regs + GINTMSK); u32 new_gsintmsk; new_gsintmsk = gsintmsk | ints; if (new_gsintmsk != gsintmsk) { dev_dbg(hsotg->dev, "gsintmsk now 0x%08x\n", new_gsintmsk); writel(new_gsintmsk, hsotg->regs + GINTMSK); } } /** * s3c_hsotg_disable_gsint - disable one or more of the general interrupt * @hsotg: The device state * @ints: A bitmask of the interrupts to enable */ static void s3c_hsotg_disable_gsint(struct dwc2_hsotg *hsotg, u32 ints) { u32 gsintmsk = readl(hsotg->regs + GINTMSK); u32 new_gsintmsk; new_gsintmsk = gsintmsk & ~ints; if (new_gsintmsk != gsintmsk) writel(new_gsintmsk, hsotg->regs + GINTMSK); } /** * s3c_hsotg_ctrl_epint - enable/disable an endpoint irq * @hsotg: The device state * @ep: The endpoint index * @dir_in: True if direction is in. * @en: The enable value, true to enable * * Set or clear the mask for an individual endpoint's interrupt * request. */ static void s3c_hsotg_ctrl_epint(struct dwc2_hsotg *hsotg, unsigned int ep, unsigned int dir_in, unsigned int en) { unsigned long flags; u32 bit = 1 << ep; u32 daint; if (!dir_in) bit <<= 16; local_irq_save(flags); daint = readl(hsotg->regs + DAINTMSK); if (en) daint |= bit; else daint &= ~bit; writel(daint, hsotg->regs + DAINTMSK); local_irq_restore(flags); } /** * s3c_hsotg_init_fifo - initialise non-periodic FIFOs * @hsotg: The device instance. */ static void s3c_hsotg_init_fifo(struct dwc2_hsotg *hsotg) { unsigned int ep; unsigned int addr; int timeout; u32 val; /* set RX/NPTX FIFO sizes */ writel(hsotg->g_rx_fifo_sz, hsotg->regs + GRXFSIZ); writel((hsotg->g_rx_fifo_sz << FIFOSIZE_STARTADDR_SHIFT) | (hsotg->g_np_g_tx_fifo_sz << FIFOSIZE_DEPTH_SHIFT), hsotg->regs + GNPTXFSIZ); /* * arange all the rest of the TX FIFOs, as some versions of this * block have overlapping default addresses. This also ensures * that if the settings have been changed, then they are set to * known values. */ /* start at the end of the GNPTXFSIZ, rounded up */ addr = hsotg->g_rx_fifo_sz + hsotg->g_np_g_tx_fifo_sz; /* * Configure fifos sizes from provided configuration and assign * them to endpoints dynamically according to maxpacket size value of * given endpoint. */ for (ep = 1; ep < MAX_EPS_CHANNELS; ep++) { if (!hsotg->g_tx_fifo_sz[ep]) continue; val = addr; val |= hsotg->g_tx_fifo_sz[ep] << FIFOSIZE_DEPTH_SHIFT; WARN_ONCE(addr + hsotg->g_tx_fifo_sz[ep] > hsotg->fifo_mem, "insufficient fifo memory"); addr += hsotg->g_tx_fifo_sz[ep]; writel(val, hsotg->regs + DPTXFSIZN(ep)); } /* * according to p428 of the design guide, we need to ensure that * all fifos are flushed before continuing */ writel(GRSTCTL_TXFNUM(0x10) | GRSTCTL_TXFFLSH | GRSTCTL_RXFFLSH, hsotg->regs + GRSTCTL); /* wait until the fifos are both flushed */ timeout = 100; while (1) { val = readl(hsotg->regs + GRSTCTL); if ((val & (GRSTCTL_TXFFLSH | GRSTCTL_RXFFLSH)) == 0) break; if (--timeout == 0) { dev_err(hsotg->dev, "%s: timeout flushing fifos (GRSTCTL=%08x)\n", __func__, val); } udelay(1); } dev_dbg(hsotg->dev, "FIFOs reset, timeout at %d\n", timeout); } /** * @ep: USB endpoint to allocate request for. * @flags: Allocation flags * * Allocate a new USB request structure appropriate for the specified endpoint */ static struct usb_request *s3c_hsotg_ep_alloc_request(struct usb_ep *ep, gfp_t flags) { struct s3c_hsotg_req *req; req = kzalloc(sizeof(struct s3c_hsotg_req), flags); if (!req) return NULL; INIT_LIST_HEAD(&req->queue); return &req->req; } /** * is_ep_periodic - return true if the endpoint is in periodic mode. * @hs_ep: The endpoint to query. * * Returns true if the endpoint is in periodic mode, meaning it is being * used for an Interrupt or ISO transfer. */ static inline int is_ep_periodic(struct s3c_hsotg_ep *hs_ep) { return hs_ep->periodic; } /** * s3c_hsotg_unmap_dma - unmap the DMA memory being used for the request * @hsotg: The device state. * @hs_ep: The endpoint for the request * @hs_req: The request being processed. * * This is the reverse of s3c_hsotg_map_dma(), called for the completion * of a request to ensure the buffer is ready for access by the caller. */ static void s3c_hsotg_unmap_dma(struct dwc2_hsotg *hsotg, struct s3c_hsotg_ep *hs_ep, struct s3c_hsotg_req *hs_req) { struct usb_request *req = &hs_req->req; /* ignore this if we're not moving any data */ if (hs_req->req.length == 0) return; usb_gadget_unmap_request(&hsotg->gadget, req, hs_ep->dir_in); } /** * s3c_hsotg_write_fifo - write packet Data to the TxFIFO * @hsotg: The controller state. * @hs_ep: The endpoint we're going to write for. * @hs_req: The request to write data for. * * This is called when the TxFIFO has some space in it to hold a new * transmission and we have something to give it. The actual setup of * the data size is done elsewhere, so all we have to do is to actually * write the data. * * The return value is zero if there is more space (or nothing was done) * otherwise -ENOSPC is returned if the FIFO space was used up. * * This routine is only needed for PIO */ static int s3c_hsotg_write_fifo(struct dwc2_hsotg *hsotg, struct s3c_hsotg_ep *hs_ep, struct s3c_hsotg_req *hs_req) { bool periodic = is_ep_periodic(hs_ep); u32 gnptxsts = readl(hsotg->regs + GNPTXSTS); int buf_pos = hs_req->req.actual; int to_write = hs_ep->size_loaded; void *data; int can_write; int pkt_round; int max_transfer; to_write -= (buf_pos - hs_ep->last_load); /* if there's nothing to write, get out early */ if (to_write == 0) return 0; if (periodic && !hsotg->dedicated_fifos) { u32 epsize = readl(hsotg->regs + DIEPTSIZ(hs_ep->index)); int size_left; int size_done; /* * work out how much data was loaded so we can calculate * how much data is left in the fifo. */ size_left = DXEPTSIZ_XFERSIZE_GET(epsize); /* * if shared fifo, we cannot write anything until the * previous data has been completely sent. */ if (hs_ep->fifo_load != 0) { s3c_hsotg_en_gsint(hsotg, GINTSTS_PTXFEMP); return -ENOSPC; } dev_dbg(hsotg->dev, "%s: left=%d, load=%d, fifo=%d, size %d\n", __func__, size_left, hs_ep->size_loaded, hs_ep->fifo_load, hs_ep->fifo_size); /* how much of the data has moved */ size_done = hs_ep->size_loaded - size_left; /* how much data is left in the fifo */ can_write = hs_ep->fifo_load - size_done; dev_dbg(hsotg->dev, "%s: => can_write1=%d\n", __func__, can_write); can_write = hs_ep->fifo_size - can_write; dev_dbg(hsotg->dev, "%s: => can_write2=%d\n", __func__, can_write); if (can_write <= 0) { s3c_hsotg_en_gsint(hsotg, GINTSTS_PTXFEMP); return -ENOSPC; } } else if (hsotg->dedicated_fifos && hs_ep->index != 0) { can_write = readl(hsotg->regs + DTXFSTS(hs_ep->index)); can_write &= 0xffff; can_write *= 4; } else { if (GNPTXSTS_NP_TXQ_SPC_AVAIL_GET(gnptxsts) == 0) { dev_dbg(hsotg->dev, "%s: no queue slots available (0x%08x)\n", __func__, gnptxsts); s3c_hsotg_en_gsint(hsotg, GINTSTS_NPTXFEMP); return -ENOSPC; } can_write = GNPTXSTS_NP_TXF_SPC_AVAIL_GET(gnptxsts); can_write *= 4; /* fifo size is in 32bit quantities. */ } max_transfer = hs_ep->ep.maxpacket * hs_ep->mc; dev_dbg(hsotg->dev, "%s: GNPTXSTS=%08x, can=%d, to=%d, max_transfer %d\n", __func__, gnptxsts, can_write, to_write, max_transfer); /* * limit to 512 bytes of data, it seems at least on the non-periodic * FIFO, requests of >512 cause the endpoint to get stuck with a * fragment of the end of the transfer in it. */ if (can_write > 512 && !periodic) can_write = 512; /* * limit the write to one max-packet size worth of data, but allow * the transfer to return that it did not run out of fifo space * doing it. */ if (to_write > max_transfer) { to_write = max_transfer; /* it's needed only when we do not use dedicated fifos */ if (!hsotg->dedicated_fifos) s3c_hsotg_en_gsint(hsotg, periodic ? GINTSTS_PTXFEMP : GINTSTS_NPTXFEMP); } /* see if we can write data */ if (to_write > can_write) { to_write = can_write; pkt_round = to_write % max_transfer; /* * Round the write down to an * exact number of packets. * * Note, we do not currently check to see if we can ever * write a full packet or not to the FIFO. */ if (pkt_round) to_write -= pkt_round; /* * enable correct FIFO interrupt to alert us when there * is more room left. */ /* it's needed only when we do not use dedicated fifos */ if (!hsotg->dedicated_fifos) s3c_hsotg_en_gsint(hsotg, periodic ? GINTSTS_PTXFEMP : GINTSTS_NPTXFEMP); } dev_dbg(hsotg->dev, "write %d/%d, can_write %d, done %d\n", to_write, hs_req->req.length, can_write, buf_pos); if (to_write <= 0) return -ENOSPC; hs_req->req.actual = buf_pos + to_write; hs_ep->total_data += to_write; if (periodic) hs_ep->fifo_load += to_write; to_write = DIV_ROUND_UP(to_write, 4); data = hs_req->req.buf + buf_pos; iowrite32_rep(hsotg->regs + EPFIFO(hs_ep->index), data, to_write); return (to_write >= can_write) ? -ENOSPC : 0; } /** * get_ep_limit - get the maximum data legnth for this endpoint * @hs_ep: The endpoint * * Return the maximum data that can be queued in one go on a given endpoint * so that transfers that are too long can be split. */ static unsigned get_ep_limit(struct s3c_hsotg_ep *hs_ep) { int index = hs_ep->index; unsigned maxsize; unsigned maxpkt; if (index != 0) { maxsize = DXEPTSIZ_XFERSIZE_LIMIT + 1; maxpkt = DXEPTSIZ_PKTCNT_LIMIT + 1; } else { maxsize = 64+64; if (hs_ep->dir_in) maxpkt = DIEPTSIZ0_PKTCNT_LIMIT + 1; else maxpkt = 2; } /* we made the constant loading easier above by using +1 */ maxpkt--; maxsize--; /* * constrain by packet count if maxpkts*pktsize is greater * than the length register size. */ if ((maxpkt * hs_ep->ep.maxpacket) < maxsize) maxsize = maxpkt * hs_ep->ep.maxpacket; return maxsize; } /** * s3c_hsotg_start_req - start a USB request from an endpoint's queue * @hsotg: The controller state. * @hs_ep: The endpoint to process a request for * @hs_req: The request to start. * @continuing: True if we are doing more for the current request. * * Start the given request running by setting the endpoint registers * appropriately, and writing any data to the FIFOs. */ static void s3c_hsotg_start_req(struct dwc2_hsotg *hsotg, struct s3c_hsotg_ep *hs_ep, struct s3c_hsotg_req *hs_req, bool continuing) { struct usb_request *ureq = &hs_req->req; int index = hs_ep->index; int dir_in = hs_ep->dir_in; u32 epctrl_reg; u32 epsize_reg; u32 epsize; u32 ctrl; unsigned length; unsigned packets; unsigned maxreq; if (index != 0) { if (hs_ep->req && !continuing) { dev_err(hsotg->dev, "%s: active request\n", __func__); WARN_ON(1); return; } else if (hs_ep->req != hs_req && continuing) { dev_err(hsotg->dev, "%s: continue different req\n", __func__); WARN_ON(1); return; } } epctrl_reg = dir_in ? DIEPCTL(index) : DOEPCTL(index); epsize_reg = dir_in ? DIEPTSIZ(index) : DOEPTSIZ(index); dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x, ep %d, dir %s\n", __func__, readl(hsotg->regs + epctrl_reg), index, hs_ep->dir_in ? "in" : "out"); /* If endpoint is stalled, we will restart request later */ ctrl = readl(hsotg->regs + epctrl_reg); if (ctrl & DXEPCTL_STALL) { dev_warn(hsotg->dev, "%s: ep%d is stalled\n", __func__, index); return; } length = ureq->length - ureq->actual; dev_dbg(hsotg->dev, "ureq->length:%d ureq->actual:%d\n", ureq->length, ureq->actual); if (0) dev_dbg(hsotg->dev, "REQ buf %p len %d dma %pad noi=%d zp=%d snok=%d\n", ureq->buf, length, &ureq->dma, ureq->no_interrupt, ureq->zero, ureq->short_not_ok); maxreq = get_ep_limit(hs_ep); if (length > maxreq) { int round = maxreq % hs_ep->ep.maxpacket; dev_dbg(hsotg->dev, "%s: length %d, max-req %d, r %d\n", __func__, length, maxreq, round); /* round down to multiple of packets */ if (round) maxreq -= round; length = maxreq; } if (length) packets = DIV_ROUND_UP(length, hs_ep->ep.maxpacket); else packets = 1; /* send one packet if length is zero. */ if (hs_ep->isochronous && length > (hs_ep->mc * hs_ep->ep.maxpacket)) { dev_err(hsotg->dev, "req length > maxpacket*mc\n"); return; } if (dir_in && index != 0) if (hs_ep->isochronous) epsize = DXEPTSIZ_MC(packets); else epsize = DXEPTSIZ_MC(1); else epsize = 0; /* * zero length packet should be programmed on its own and should not * be counted in DIEPTSIZ.PktCnt with other packets. */ if (dir_in && ureq->zero && !continuing) { /* Test if zlp is actually required. */ if ((ureq->length >= hs_ep->ep.maxpacket) && !(ureq->length % hs_ep->ep.maxpacket)) hs_ep->sent_zlp = 1; } epsize |= DXEPTSIZ_PKTCNT(packets); epsize |= DXEPTSIZ_XFERSIZE(length); dev_dbg(hsotg->dev, "%s: %d@%d/%d, 0x%08x => 0x%08x\n", __func__, packets, length, ureq->length, epsize, epsize_reg); /* store the request as the current one we're doing */ hs_ep->req = hs_req; /* write size / packets */ writel(epsize, hsotg->regs + epsize_reg); if (using_dma(hsotg) && !continuing) { unsigned int dma_reg; /* * write DMA address to control register, buffer already * synced by s3c_hsotg_ep_queue(). */ dma_reg = dir_in ? DIEPDMA(index) : DOEPDMA(index); writel(ureq->dma, hsotg->regs + dma_reg); dev_dbg(hsotg->dev, "%s: %pad => 0x%08x\n", __func__, &ureq->dma, dma_reg); } ctrl |= DXEPCTL_EPENA; /* ensure ep enabled */ ctrl |= DXEPCTL_USBACTEP; dev_dbg(hsotg->dev, "ep0 state:%d\n", hsotg->ep0_state); /* For Setup request do not clear NAK */ if (!(index == 0 && hsotg->ep0_state == DWC2_EP0_SETUP)) ctrl |= DXEPCTL_CNAK; /* clear NAK set by core */ dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x\n", __func__, ctrl); writel(ctrl, hsotg->regs + epctrl_reg); /* * set these, it seems that DMA support increments past the end * of the packet buffer so we need to calculate the length from * this information. */ hs_ep->size_loaded = length; hs_ep->last_load = ureq->actual; if (dir_in && !using_dma(hsotg)) { /* set these anyway, we may need them for non-periodic in */ hs_ep->fifo_load = 0; s3c_hsotg_write_fifo(hsotg, hs_ep, hs_req); } /* * clear the INTknTXFEmpMsk when we start request, more as a aide * to debugging to see what is going on. */ if (dir_in) writel(DIEPMSK_INTKNTXFEMPMSK, hsotg->regs + DIEPINT(index)); /* * Note, trying to clear the NAK here causes problems with transmit * on the S3C6400 ending up with the TXFIFO becoming full. */ /* check ep is enabled */ if (!(readl(hsotg->regs + epctrl_reg) & DXEPCTL_EPENA)) dev_dbg(hsotg->dev, "ep%d: failed to become enabled (DXEPCTL=0x%08x)?\n", index, readl(hsotg->regs + epctrl_reg)); dev_dbg(hsotg->dev, "%s: DXEPCTL=0x%08x\n", __func__, readl(hsotg->regs + epctrl_reg)); /* enable ep interrupts */ s3c_hsotg_ctrl_epint(hsotg, hs_ep->index, hs_ep->dir_in, 1); } /** * s3c_hsotg_map_dma - map the DMA memory being used for the request * @hsotg: The device state. * @hs_ep: The endpoint the request is on. * @req: The request being processed. * * We've been asked to queue a request, so ensure that the memory buffer * is correctly setup for DMA. If we've been passed an extant DMA address * then ensure the buffer has been synced to memory. If our buffer has no * DMA memory, then we map the memory and mark our request to allow us to * cleanup on completion. */ static int s3c_hsotg_map_dma(struct dwc2_hsotg *hsotg, struct s3c_hsotg_ep *hs_ep, struct usb_request *req) { struct s3c_hsotg_req *hs_req = our_req(req); int ret; /* if the length is zero, ignore the DMA data */ if (hs_req->req.length == 0) return 0; ret = usb_gadget_map_request(&hsotg->gadget, req, hs_ep->dir_in); if (ret) goto dma_error; return 0; dma_error: dev_err(hsotg->dev, "%s: failed to map buffer %p, %d bytes\n", __func__, req->buf, req->length); return -EIO; } static int s3c_hsotg_ep_queue(struct usb_ep *ep, struct usb_request *req, gfp_t gfp_flags) { struct s3c_hsotg_req *hs_req = our_req(req); struct s3c_hsotg_ep *hs_ep = our_ep(ep); struct dwc2_hsotg *hs = hs_ep->parent; bool first; dev_dbg(hs->dev, "%s: req %p: %d@%p, noi=%d, zero=%d, snok=%d\n", ep->name, req, req->length, req->buf, req->no_interrupt, req->zero, req->short_not_ok); /* initialise status of the request */ INIT_LIST_HEAD(&hs_req->queue); req->actual = 0; req->status = -EINPROGRESS; /* if we're using DMA, sync the buffers as necessary */ if (using_dma(hs)) { int ret = s3c_hsotg_map_dma(hs, hs_ep, req); if (ret) return ret; } first = list_empty(&hs_ep->queue); list_add_tail(&hs_req->queue, &hs_ep->queue); if (first) s3c_hsotg_start_req(hs, hs_ep, hs_req, false); return 0; } static int s3c_hsotg_ep_queue_lock(struct usb_ep *ep, struct usb_request *req, gfp_t gfp_flags) { struct s3c_hsotg_ep *hs_ep = our_ep(ep); struct dwc2_hsotg *hs = hs_ep->parent; unsigned long flags = 0; int ret = 0; spin_lock_irqsave(&hs->lock, flags); ret = s3c_hsotg_ep_queue(ep, req, gfp_flags); spin_unlock_irqrestore(&hs->lock, flags); return ret; } static void s3c_hsotg_ep_free_request(struct usb_ep *ep, struct usb_request *req) { struct s3c_hsotg_req *hs_req = our_req(req); kfree(hs_req); } /** * s3c_hsotg_complete_oursetup - setup completion callback * @ep: The endpoint the request was on. * @req: The request completed. * * Called on completion of any requests the driver itself * submitted that need cleaning up. */ static void s3c_hsotg_complete_oursetup(struct usb_ep *ep, struct usb_request *req) { struct s3c_hsotg_ep *hs_ep = our_ep(ep); struct dwc2_hsotg *hsotg = hs_ep->parent; dev_dbg(hsotg->dev, "%s: ep %p, req %p\n", __func__, ep, req); s3c_hsotg_ep_free_request(ep, req); } /** * ep_from_windex - convert control wIndex value to endpoint * @hsotg: The driver state. * @windex: The control request wIndex field (in host order). * * Convert the given wIndex into a pointer to an driver endpoint * structure, or return NULL if it is not a valid endpoint. */ static struct s3c_hsotg_ep *ep_from_windex(struct dwc2_hsotg *hsotg, u32 windex) { struct s3c_hsotg_ep *ep; int dir = (windex & USB_DIR_IN) ? 1 : 0; int idx = windex & 0x7F; if (windex >= 0x100) return NULL; if (idx > hsotg->num_of_eps) return NULL; ep = index_to_ep(hsotg, idx, dir); if (idx && ep->dir_in != dir) return NULL; return ep; } /** * s3c_hsotg_send_reply - send reply to control request * @hsotg: The device state * @ep: Endpoint 0 * @buff: Buffer for request * @length: Length of reply. * * Create a request and queue it on the given endpoint. This is useful as * an internal method of sending replies to certain control requests, etc. */ static int s3c_hsotg_send_reply(struct dwc2_hsotg *hsotg, struct s3c_hsotg_ep *ep, void *buff, int length) { struct usb_request *req; int ret; dev_dbg(hsotg->dev, "%s: buff %p, len %d\n", __func__, buff, length); req = s3c_hsotg_ep_alloc_request(&ep->ep, GFP_ATOMIC); hsotg->ep0_reply = req; if (!req) { dev_warn(hsotg->dev, "%s: cannot alloc req\n", __func__); return -ENOMEM; } req->buf = hsotg->ep0_buff; req->length = length; /* * zero flag is for sending zlp in DATA IN stage. It has no impact on * STATUS stage. */ req->zero = 0; req->complete = s3c_hsotg_complete_oursetup; if (length) memcpy(req->buf, buff, length); ret = s3c_hsotg_ep_queue(&ep->ep, req, GFP_ATOMIC); if (ret) { dev_warn(hsotg->dev, "%s: cannot queue req\n", __func__); return ret; } return 0; } /** * s3c_hsotg_process_req_status - process request GET_STATUS * @hsotg: The device state * @ctrl: USB control request */ static int s3c_hsotg_process_req_status(struct dwc2_hsotg *hsotg, struct usb_ctrlrequest *ctrl) { struct s3c_hsotg_ep *ep0 = hsotg->eps_out[0]; struct s3c_hsotg_ep *ep; __le16 reply; int ret; dev_dbg(hsotg->dev, "%s: USB_REQ_GET_STATUS\n", __func__); if (!ep0->dir_in) { dev_warn(hsotg->dev, "%s: direction out?\n", __func__); return -EINVAL; } switch (ctrl->bRequestType & USB_RECIP_MASK) { case USB_RECIP_DEVICE: reply = cpu_to_le16(0); /* bit 0 => self powered, * bit 1 => remote wakeup */ break; case USB_RECIP_INTERFACE: /* currently, the data result should be zero */ reply = cpu_to_le16(0); break; case USB_RECIP_ENDPOINT: ep = ep_from_windex(hsotg, le16_to_cpu(ctrl->wIndex)); if (!ep) return -ENOENT; reply = cpu_to_le16(ep->halted ? 1 : 0); break; default: return 0; } if (le16_to_cpu(ctrl->wLength) != 2) return -EINVAL; ret = s3c_hsotg_send_reply(hsotg, ep0, &reply, 2); if (ret) { dev_err(hsotg->dev, "%s: failed to send reply\n", __func__); return ret; } return 1; } static int s3c_hsotg_ep_sethalt(struct usb_ep *ep, int value); /** * get_ep_head - return the first request on the endpoint * @hs_ep: The controller endpoint to get * * Get the first request on the endpoint. */ static struct s3c_hsotg_req *get_ep_head(struct s3c_hsotg_ep *hs_ep) { if (list_empty(&hs_ep->queue)) return NULL; return list_first_entry(&hs_ep->queue, struct s3c_hsotg_req, queue); } /** * s3c_hsotg_process_req_featire - process request {SET,CLEAR}_FEATURE * @hsotg: The device state * @ctrl: USB control request */ static int s3c_hsotg_process_req_feature(struct dwc2_hsotg *hsotg, struct usb_ctrlrequest *ctrl) { struct s3c_hsotg_ep *ep0 = hsotg->eps_out[0]; struct s3c_hsotg_req *hs_req; bool restart; bool set = (ctrl->bRequest == USB_REQ_SET_FEATURE); struct s3c_hsotg_ep *ep; int ret; bool halted; dev_dbg(hsotg->dev, "%s: %s_FEATURE\n", __func__, set ? "SET" : "CLEAR"); if (ctrl->bRequestType == USB_RECIP_ENDPOINT) { ep = ep_from_windex(hsotg, le16_to_cpu(ctrl->wIndex)); if (!ep) { dev_dbg(hsotg->dev, "%s: no endpoint for 0x%04x\n", __func__, le16_to_cpu(ctrl->wIndex)); return -ENOENT; } switch (le16_to_cpu(ctrl->wValue)) { case USB_ENDPOINT_HALT: halted = ep->halted; s3c_hsotg_ep_sethalt(&ep->ep, set); ret = s3c_hsotg_send_reply(hsotg, ep0, NULL, 0); if (ret) { dev_err(hsotg->dev, "%s: failed to send reply\n", __func__); return ret; } /* * we have to complete all requests for ep if it was * halted, and the halt was cleared by CLEAR_FEATURE */ if (!set && halted) { /* * If we have request in progress, * then complete it */ if (ep->req) { hs_req = ep->req; ep->req = NULL; list_del_init(&hs_req->queue); usb_gadget_giveback_request(&ep->ep, &hs_req->req); } /* If we have pending request, then start it */ restart = !list_empty(&ep->queue); if (restart) { hs_req = get_ep_head(ep); s3c_hsotg_start_req(hsotg, ep, hs_req, false); } } break; default: return -ENOENT; } } else return -ENOENT; /* currently only deal with endpoint */ return 1; } static void s3c_hsotg_enqueue_setup(struct dwc2_hsotg *hsotg); /** * s3c_hsotg_stall_ep0 - stall ep0 * @hsotg: The device state * * Set stall for ep0 as response for setup request. */ static void s3c_hsotg_stall_ep0(struct dwc2_hsotg *hsotg) { struct s3c_hsotg_ep *ep0 = hsotg->eps_out[0]; u32 reg; u32 ctrl; dev_dbg(hsotg->dev, "ep0 stall (dir=%d)\n", ep0->dir_in); reg = (ep0->dir_in) ? DIEPCTL0 : DOEPCTL0; /* * DxEPCTL_Stall will be cleared by EP once it has * taken effect, so no need to clear later. */ ctrl = readl(hsotg->regs + reg); ctrl |= DXEPCTL_STALL; ctrl |= DXEPCTL_CNAK; writel(ctrl, hsotg->regs + reg); dev_dbg(hsotg->dev, "written DXEPCTL=0x%08x to %08x (DXEPCTL=0x%08x)\n", ctrl, reg, readl(hsotg->regs + reg)); /* * complete won't be called, so we enqueue * setup request here */ s3c_hsotg_enqueue_setup(hsotg); } /** * s3c_hsotg_process_control - process a control request * @hsotg: The device state * @ctrl: The control request received * * The controller has received the SETUP phase of a control request, and * needs to work out what to do next (and whether to pass it on to the * gadget driver). */ static void s3c_hsotg_process_control(struct dwc2_hsotg *hsotg, struct usb_ctrlrequest *ctrl) { struct s3c_hsotg_ep *ep0 = hsotg->eps_out[0]; int ret = 0; u32 dcfg; dev_dbg(hsotg->dev, "ctrl Req=%02x, Type=%02x, V=%04x, L=%04x\n", ctrl->bRequest, ctrl->bRequestType, ctrl->wValue, ctrl->wLength); if (ctrl->wLength == 0) { ep0->dir_in = 1; hsotg->ep0_state = DWC2_EP0_STATUS_IN; } else if (ctrl->bRequestType & USB_DIR_IN) { ep0->dir_in = 1; hsotg->ep0_state = DWC2_EP0_DATA_IN; } else { ep0->dir_in = 0; hsotg->ep0_state = DWC2_EP0_DATA_OUT; } if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) { switch (ctrl->bRequest) { case USB_REQ_SET_ADDRESS: dcfg = readl(hsotg->regs + DCFG); dcfg &= ~DCFG_DEVADDR_MASK; dcfg |= (le16_to_cpu(ctrl->wValue) << DCFG_DEVADDR_SHIFT) & DCFG_DEVADDR_MASK; writel(dcfg, hsotg->regs + DCFG); dev_info(hsotg->dev, "new address %d\n", ctrl->wValue); ret = s3c_hsotg_send_reply(hsotg, ep0, NULL, 0); return; case USB_REQ_GET_STATUS: ret = s3c_hsotg_process_req_status(hsotg, ctrl); break; case USB_REQ_CLEAR_FEATURE: case USB_REQ_SET_FEATURE: ret = s3c_hsotg_process_req_feature(hsotg, ctrl); break; } } /* as a fallback, try delivering it to the driver to deal with */ if (ret == 0 && hsotg->driver) { spin_unlock(&hsotg->lock); ret = hsotg->driver->setup(&hsotg->gadget, ctrl); spin_lock(&hsotg->lock); if (ret < 0) dev_dbg(hsotg->dev, "driver->setup() ret %d\n", ret); } /* * the request is either unhandlable, or is not formatted correctly * so respond with a STALL for the status stage to indicate failure. */ if (ret < 0) s3c_hsotg_stall_ep0(hsotg); } /** * s3c_hsotg_complete_setup - completion of a setup transfer * @ep: The endpoint the request was on. * @req: The request completed. * * Called on completion of any requests the driver itself submitted for * EP0 setup packets */ static void s3c_hsotg_complete_setup(struct usb_ep *ep, struct usb_request *req) { struct s3c_hsotg_ep *hs_ep = our_ep(ep); struct dwc2_hsotg *hsotg = hs_ep->parent; if (req->status < 0) { dev_dbg(hsotg->dev, "%s: failed %d\n", __func__, req->status); return; } spin_lock(&hsotg->lock); if (req->actual == 0) s3c_hsotg_enqueue_setup(hsotg); else s3c_hsotg_process_control(hsotg, req->buf); spin_unlock(&hsotg->lock); } /** * s3c_hsotg_enqueue_setup - start a request for EP0 packets * @hsotg: The device state. * * Enqueue a request on EP0 if necessary to received any SETUP packets * received from the host. */ static void s3c_hsotg_enqueue_setup(struct dwc2_hsotg *hsotg) { struct usb_request *req = hsotg->ctrl_req; struct s3c_hsotg_req *hs_req = our_req(req); int ret; dev_dbg(hsotg->dev, "%s: queueing setup request\n", __func__); req->zero = 0; req->length = 8; req->buf = hsotg->ctrl_buff; req->complete = s3c_hsotg_complete_setup; if (!list_empty(&hs_req->queue)) { dev_dbg(hsotg->dev, "%s already queued???\n", __func__); return; } hsotg->eps_out[0]->dir_in = 0; hsotg->eps_out[0]->sent_zlp = 0; hsotg->ep0_state = DWC2_EP0_SETUP; ret = s3c_hsotg_ep_queue(&hsotg->eps_out[0]->ep, req, GFP_ATOMIC); if (ret < 0) { dev_err(hsotg->dev, "%s: failed queue (%d)\n", __func__, ret); /* * Don't think there's much we can do other than watch the * driver fail. */ } } static void s3c_hsotg_program_zlp(struct dwc2_hsotg *hsotg, struct s3c_hsotg_ep *hs_ep) { u32 ctrl; u8 index = hs_ep->index; u32 epctl_reg = hs_ep->dir_in ? DIEPCTL(index) : DOEPCTL(index); u32 epsiz_reg = hs_ep->dir_in ? DIEPTSIZ(index) : DOEPTSIZ(index); dev_dbg(hsotg->dev, "Sending zero-length packet on ep%d\n", index); writel(DXEPTSIZ_MC(1) | DXEPTSIZ_PKTCNT(1) | DXEPTSIZ_XFERSIZE(0), hsotg->regs + epsiz_reg); ctrl = readl(hsotg->regs + epctl_reg); ctrl |= DXEPCTL_CNAK; /* clear NAK set by core */ ctrl |= DXEPCTL_EPENA; /* ensure ep enabled */ ctrl |= DXEPCTL_USBACTEP; writel(ctrl, hsotg->regs + epctl_reg); } /** * s3c_hsotg_complete_request - complete a request given to us * @hsotg: The device state. * @hs_ep: The endpoint the request was on. * @hs_req: The request to complete. * @result: The result code (0 => Ok, otherwise errno) * * The given request has finished, so call the necessary completion * if it has one and then look to see if we can start a new request * on the endpoint. * * Note, expects the ep to already be locked as appropriate. */ static void s3c_hsotg_complete_request(struct dwc2_hsotg *hsotg, struct s3c_hsotg_ep *hs_ep, struct s3c_hsotg_req *hs_req, int result) { bool restart; if (!hs_req) { dev_dbg(hsotg->dev, "%s: nothing to complete?\n", __func__); return; } dev_dbg(hsotg->dev, "complete: ep %p %s, req %p, %d => %p\n", hs_ep, hs_ep->ep.name, hs_req, result, hs_req->req.complete); /* * only replace the status if we've not already set an error * from a previous transaction */ if (hs_req->req.status == -EINPROGRESS) hs_req->req.status = result; hs_ep->req = NULL; list_del_init(&hs_req->queue); if (using_dma(hsotg)) s3c_hsotg_unmap_dma(hsotg, hs_ep, hs_req); /* * call the complete request with the locks off, just in case the * request tries to queue more work for this endpoint. */ if (hs_req->req.complete) { spin_unlock(&hsotg->lock); usb_gadget_giveback_request(&hs_ep->ep, &hs_req->req); spin_lock(&hsotg->lock); } /* * Look to see if there is anything else to do. Note, the completion * of the previous request may have caused a new request to be started * so be careful when doing this. */ if (!hs_ep->req && result >= 0) { restart = !list_empty(&hs_ep->queue); if (restart) { hs_req = get_ep_head(hs_ep); s3c_hsotg_start_req(hsotg, hs_ep, hs_req, false); } } } /** * s3c_hsotg_rx_data - receive data from the FIFO for an endpoint * @hsotg: The device state. * @ep_idx: The endpoint index for the data * @size: The size of data in the fifo, in bytes * * The FIFO status shows there is data to read from the FIFO for a given * endpoint, so sort out whether we need to read the data into a request * that has been made for that endpoint. */ static void s3c_hsotg_rx_data(struct dwc2_hsotg *hsotg, int ep_idx, int size) { struct s3c_hsotg_ep *hs_ep = hsotg->eps_out[ep_idx]; struct s3c_hsotg_req *hs_req = hs_ep->req; void __iomem *fifo = hsotg->regs + EPFIFO(ep_idx); int to_read; int max_req; int read_ptr; if (!hs_req) { u32 epctl = readl(hsotg->regs + DOEPCTL(ep_idx)); int ptr; dev_dbg(hsotg->dev, "%s: FIFO %d bytes on ep%d but no req (DXEPCTl=0x%08x)\n", __func__, size, ep_idx, epctl); /* dump the data from the FIFO, we've nothing we can do */ for (ptr = 0; ptr < size; ptr += 4) (void)readl(fifo); return; } to_read = size; read_ptr = hs_req->req.actual; max_req = hs_req->req.length - read_ptr; dev_dbg(hsotg->dev, "%s: read %d/%d, done %d/%d\n", __func__, to_read, max_req, read_ptr, hs_req->req.length); if (to_read > max_req) { /* * more data appeared than we where willing * to deal with in this request. */ /* currently we don't deal this */ WARN_ON_ONCE(1); } hs_ep->total_data += to_read; hs_req->req.actual += to_read; to_read = DIV_ROUND_UP(to_read, 4); /* * note, we might over-write the buffer end by 3 bytes depending on * alignment of the data. */ ioread32_rep(fifo, hs_req->req.buf + read_ptr, to_read); } /** * s3c_hsotg_ep0_zlp - send/receive zero-length packet on control endpoint * @hsotg: The device instance * @dir_in: If IN zlp * * Generate a zero-length IN packet request for terminating a SETUP * transaction. * * Note, since we don't write any data to the TxFIFO, then it is * currently believed that we do not need to wait for any space in * the TxFIFO. */ static void s3c_hsotg_ep0_zlp(struct dwc2_hsotg *hsotg, bool dir_in) { /* eps_out[0] is used in both directions */ hsotg->eps_out[0]->dir_in = dir_in; hsotg->ep0_state = dir_in ? DWC2_EP0_STATUS_IN : DWC2_EP0_STATUS_OUT; s3c_hsotg_program_zlp(hsotg, hsotg->eps_out[0]); } /** * s3c_hsotg_handle_outdone - handle receiving OutDone/SetupDone from RXFIFO * @hsotg: The device instance * @epnum: The endpoint received from * * The RXFIFO has delivered an OutDone event, which means that the data * transfer for an OUT endpoint has been completed, either by a short * packet or by the finish of a transfer. */ static void s3c_hsotg_handle_outdone(struct dwc2_hsotg *hsotg, int epnum) { u32 epsize = readl(hsotg->regs + DOEPTSIZ(epnum)); struct s3c_hsotg_ep *hs_ep = hsotg->eps_out[epnum]; struct s3c_hsotg_req *hs_req = hs_ep->req; struct usb_request *req = &hs_req->req; unsigned size_left = DXEPTSIZ_XFERSIZE_GET(epsize); int result = 0; if (!hs_req) { dev_dbg(hsotg->dev, "%s: no request active\n", __func__); return; } if (epnum == 0 && hsotg->ep0_state == DWC2_EP0_STATUS_OUT) { dev_dbg(hsotg->dev, "zlp packet received\n"); s3c_hsotg_complete_request(hsotg, hs_ep, hs_req, 0); s3c_hsotg_enqueue_setup(hsotg); return; } if (using_dma(hsotg)) { unsigned size_done; /* * Calculate the size of the transfer by checking how much * is left in the endpoint size register and then working it * out from the amount we loaded for the transfer. * * We need to do this as DMA pointers are always 32bit aligned * so may overshoot/undershoot the transfer. */ size_done = hs_ep->size_loaded - size_left; size_done += hs_ep->last_load; req->actual = size_done; } /* if there is more request to do, schedule new transfer */ if (req->actual < req->length && size_left == 0) { s3c_hsotg_start_req(hsotg, hs_ep, hs_req, true); return; } if (req->actual < req->length && req->short_not_ok) { dev_dbg(hsotg->dev, "%s: got %d/%d (short not ok) => error\n", __func__, req->actual, req->length); /* * todo - what should we return here? there's no one else * even bothering to check the status. */ } if (epnum == 0 && hsotg->ep0_state == DWC2_EP0_DATA_OUT) { /* Move to STATUS IN */ s3c_hsotg_ep0_zlp(hsotg, true); return; } s3c_hsotg_complete_request(hsotg, hs_ep, hs_req, result); } /** * s3c_hsotg_read_frameno - read current frame number * @hsotg: The device instance * * Return the current frame number */ static u32 s3c_hsotg_read_frameno(struct dwc2_hsotg *hsotg) { u32 dsts; dsts = readl(hsotg->regs + DSTS); dsts &= DSTS_SOFFN_MASK; dsts >>= DSTS_SOFFN_SHIFT; return dsts; } /** * s3c_hsotg_handle_rx - RX FIFO has data * @hsotg: The device instance * * The IRQ handler has detected that the RX FIFO has some data in it * that requires processing, so find out what is in there and do the * appropriate read. * * The RXFIFO is a true FIFO, the packets coming out are still in packet * chunks, so if you have x packets received on an endpoint you'll get x * FIFO events delivered, each with a packet's worth of data in it. * * When using DMA, we should not be processing events from the RXFIFO * as the actual data should be sent to the memory directly and we turn * on the completion interrupts to get notifications of transfer completion. */ static void s3c_hsotg_handle_rx(struct dwc2_hsotg *hsotg) { u32 grxstsr = readl(hsotg->regs + GRXSTSP); u32 epnum, status, size; WARN_ON(using_dma(hsotg)); epnum = grxstsr & GRXSTS_EPNUM_MASK; status = grxstsr & GRXSTS_PKTSTS_MASK; size = grxstsr & GRXSTS_BYTECNT_MASK; size >>= GRXSTS_BYTECNT_SHIFT; if (1) dev_dbg(hsotg->dev, "%s: GRXSTSP=0x%08x (%d@%d)\n", __func__, grxstsr, size, epnum); switch ((status & GRXSTS_PKTSTS_MASK) >> GRXSTS_PKTSTS_SHIFT) { case GRXSTS_PKTSTS_GLOBALOUTNAK: dev_dbg(hsotg->dev, "GLOBALOUTNAK\n"); break; case GRXSTS_PKTSTS_OUTDONE: dev_dbg(hsotg->dev, "OutDone (Frame=0x%08x)\n", s3c_hsotg_read_frameno(hsotg)); if (!using_dma(hsotg)) s3c_hsotg_handle_outdone(hsotg, epnum); break; case GRXSTS_PKTSTS_SETUPDONE: dev_dbg(hsotg->dev, "SetupDone (Frame=0x%08x, DOPEPCTL=0x%08x)\n", s3c_hsotg_read_frameno(hsotg), readl(hsotg->regs + DOEPCTL(0))); /* * Call s3c_hsotg_handle_outdone here if it was not called from * GRXSTS_PKTSTS_OUTDONE. That is, if the core didn't * generate GRXSTS_PKTSTS_OUTDONE for setup packet. */ if (hsotg->ep0_state == DWC2_EP0_SETUP) s3c_hsotg_handle_outdone(hsotg, epnum); break; case GRXSTS_PKTSTS_OUTRX: s3c_hsotg_rx_data(hsotg, epnum, size); break; case GRXSTS_PKTSTS_SETUPRX: dev_dbg(hsotg->dev, "SetupRX (Frame=0x%08x, DOPEPCTL=0x%08x)\n", s3c_hsotg_read_frameno(hsotg), readl(hsotg->regs + DOEPCTL(0))); WARN_ON(hsotg->ep0_state != DWC2_EP0_SETUP); s3c_hsotg_rx_data(hsotg, epnum, size); break; default: dev_warn(hsotg->dev, "%s: unknown status %08x\n", __func__, grxstsr); s3c_hsotg_dump(hsotg); break; } } /** * s3c_hsotg_ep0_mps - turn max packet size into register setting * @mps: The maximum packet size in bytes. */ static u32 s3c_hsotg_ep0_mps(unsigned int mps) { switch (mps) { case 64: return D0EPCTL_MPS_64; case 32: return D0EPCTL_MPS_32; case 16: return D0EPCTL_MPS_16; case 8: return D0EPCTL_MPS_8; } /* bad max packet size, warn and return invalid result */ WARN_ON(1); return (u32)-1; } /** * s3c_hsotg_set_ep_maxpacket - set endpoint's max-packet field * @hsotg: The driver state. * @ep: The index number of the endpoint * @mps: The maximum packet size in bytes * * Configure the maximum packet size for the given endpoint, updating * the hardware control registers to reflect this. */ static void s3c_hsotg_set_ep_maxpacket(struct dwc2_hsotg *hsotg, unsigned int ep, unsigned int mps, unsigned int dir_in) { struct s3c_hsotg_ep *hs_ep; void __iomem *regs = hsotg->regs; u32 mpsval; u32 mcval; u32 reg; hs_ep = index_to_ep(hsotg, ep, dir_in); if (!hs_ep) return; if (ep == 0) { /* EP0 is a special case */ mpsval = s3c_hsotg_ep0_mps(mps); if (mpsval > 3) goto bad_mps; hs_ep->ep.maxpacket = mps; hs_ep->mc = 1; } else { mpsval = mps & DXEPCTL_MPS_MASK; if (mpsval > 1024) goto bad_mps; mcval = ((mps >> 11) & 0x3) + 1; hs_ep->mc = mcval; if (mcval > 3) goto bad_mps; hs_ep->ep.maxpacket = mpsval; } if (dir_in) { reg = readl(regs + DIEPCTL(ep)); reg &= ~DXEPCTL_MPS_MASK; reg |= mpsval; writel(reg, regs + DIEPCTL(ep)); } else { reg = readl(regs + DOEPCTL(ep)); reg &= ~DXEPCTL_MPS_MASK; reg |= mpsval; writel(reg, regs + DOEPCTL(ep)); } return; bad_mps: dev_err(hsotg->dev, "ep%d: bad mps of %d\n", ep, mps); } /** * s3c_hsotg_txfifo_flush - flush Tx FIFO * @hsotg: The driver state * @idx: The index for the endpoint (0..15) */ static void s3c_hsotg_txfifo_flush(struct dwc2_hsotg *hsotg, unsigned int idx) { int timeout; int val; writel(GRSTCTL_TXFNUM(idx) | GRSTCTL_TXFFLSH, hsotg->regs + GRSTCTL); /* wait until the fifo is flushed */ timeout = 100; while (1) { val = readl(hsotg->regs + GRSTCTL); if ((val & (GRSTCTL_TXFFLSH)) == 0) break; if (--timeout == 0) { dev_err(hsotg->dev, "%s: timeout flushing fifo (GRSTCTL=%08x)\n", __func__, val); break; } udelay(1); } } /** * s3c_hsotg_trytx - check to see if anything needs transmitting * @hsotg: The driver state * @hs_ep: The driver endpoint to check. * * Check to see if there is a request that has data to send, and if so * make an attempt to write data into the FIFO. */ static int s3c_hsotg_trytx(struct dwc2_hsotg *hsotg, struct s3c_hsotg_ep *hs_ep) { struct s3c_hsotg_req *hs_req = hs_ep->req; if (!hs_ep->dir_in || !hs_req) { /** * if request is not enqueued, we disable interrupts * for endpoints, excepting ep0 */ if (hs_ep->index != 0) s3c_hsotg_ctrl_epint(hsotg, hs_ep->index, hs_ep->dir_in, 0); return 0; } if (hs_req->req.actual < hs_req->req.length) { dev_dbg(hsotg->dev, "trying to write more for ep%d\n", hs_ep->index); return s3c_hsotg_write_fifo(hsotg, hs_ep, hs_req); } return 0; } /** * s3c_hsotg_complete_in - complete IN transfer * @hsotg: The device state. * @hs_ep: The endpoint that has just completed. * * An IN transfer has been completed, update the transfer's state and then * call the relevant completion routines. */ static void s3c_hsotg_complete_in(struct dwc2_hsotg *hsotg, struct s3c_hsotg_ep *hs_ep) { struct s3c_hsotg_req *hs_req = hs_ep->req; u32 epsize = readl(hsotg->regs + DIEPTSIZ(hs_ep->index)); int size_left, size_done; if (!hs_req) { dev_dbg(hsotg->dev, "XferCompl but no req\n"); return; } /* Finish ZLP handling for IN EP0 transactions */ if (hs_ep->index == 0 && hsotg->ep0_state == DWC2_EP0_STATUS_IN) { dev_dbg(hsotg->dev, "zlp packet sent\n"); s3c_hsotg_complete_request(hsotg, hs_ep, hs_req, 0); s3c_hsotg_enqueue_setup(hsotg); return; } /* * Calculate the size of the transfer by checking how much is left * in the endpoint size register and then working it out from * the amount we loaded for the transfer. * * We do this even for DMA, as the transfer may have incremented * past the end of the buffer (DMA transfers are always 32bit * aligned). */ size_left = DXEPTSIZ_XFERSIZE_GET(epsize); size_done = hs_ep->size_loaded - size_left; size_done += hs_ep->last_load; if (hs_req->req.actual != size_done) dev_dbg(hsotg->dev, "%s: adjusting size done %d => %d\n", __func__, hs_req->req.actual, size_done); hs_req->req.actual = size_done; dev_dbg(hsotg->dev, "req->length:%d req->actual:%d req->zero:%d\n", hs_req->req.length, hs_req->req.actual, hs_req->req.zero); if (!size_left && hs_req->req.actual < hs_req->req.length) { dev_dbg(hsotg->dev, "%s trying more for req...\n", __func__); s3c_hsotg_start_req(hsotg, hs_ep, hs_req, true); return; } /* Zlp for all endpoints, for ep0 only in DATA IN stage */ if (hs_ep->sent_zlp) { s3c_hsotg_program_zlp(hsotg, hs_ep); hs_ep->sent_zlp = 0; /* transfer will be completed on next complete interrupt */ return; } if (hs_ep->index == 0 && hsotg->ep0_state == DWC2_EP0_DATA_IN) { /* Move to STATUS OUT */ s3c_hsotg_ep0_zlp(hsotg, false); return; } s3c_hsotg_complete_request(hsotg, hs_ep, hs_req, 0); } /** * s3c_hsotg_epint - handle an in/out endpoint interrupt * @hsotg: The driver state * @idx: The index for the endpoint (0..15) * @dir_in: Set if this is an IN endpoint * * Process and clear any interrupt pending for an individual endpoint */ static void s3c_hsotg_epint(struct dwc2_hsotg *hsotg, unsigned int idx, int dir_in) { struct s3c_hsotg_ep *hs_ep = index_to_ep(hsotg, idx, dir_in); u32 epint_reg = dir_in ? DIEPINT(idx) : DOEPINT(idx); u32 epctl_reg = dir_in ? DIEPCTL(idx) : DOEPCTL(idx); u32 epsiz_reg = dir_in ? DIEPTSIZ(idx) : DOEPTSIZ(idx); u32 ints; u32 ctrl; ints = readl(hsotg->regs + epint_reg); ctrl = readl(hsotg->regs + epctl_reg); /* Clear endpoint interrupts */ writel(ints, hsotg->regs + epint_reg); if (!hs_ep) { dev_err(hsotg->dev, "%s:Interrupt for unconfigured ep%d(%s)\n", __func__, idx, dir_in ? "in" : "out"); return; } dev_dbg(hsotg->dev, "%s: ep%d(%s) DxEPINT=0x%08x\n", __func__, idx, dir_in ? "in" : "out", ints); /* Don't process XferCompl interrupt if it is a setup packet */ if (idx == 0 && (ints & (DXEPINT_SETUP | DXEPINT_SETUP_RCVD))) ints &= ~DXEPINT_XFERCOMPL; if (ints & DXEPINT_XFERCOMPL) { if (hs_ep->isochronous && hs_ep->interval == 1) { if (ctrl & DXEPCTL_EOFRNUM) ctrl |= DXEPCTL_SETEVENFR; else ctrl |= DXEPCTL_SETODDFR; writel(ctrl, hsotg->regs + epctl_reg); } dev_dbg(hsotg->dev, "%s: XferCompl: DxEPCTL=0x%08x, DXEPTSIZ=%08x\n", __func__, readl(hsotg->regs + epctl_reg), readl(hsotg->regs + epsiz_reg)); /* * we get OutDone from the FIFO, so we only need to look * at completing IN requests here */ if (dir_in) { s3c_hsotg_complete_in(hsotg, hs_ep); if (idx == 0 && !hs_ep->req) s3c_hsotg_enqueue_setup(hsotg); } else if (using_dma(hsotg)) { /* * We're using DMA, we need to fire an OutDone here * as we ignore the RXFIFO. */ s3c_hsotg_handle_outdone(hsotg, idx); } } if (ints & DXEPINT_EPDISBLD) { dev_dbg(hsotg->dev, "%s: EPDisbld\n", __func__); if (dir_in) { int epctl = readl(hsotg->regs + epctl_reg); s3c_hsotg_txfifo_flush(hsotg, hs_ep->fifo_index); if ((epctl & DXEPCTL_STALL) && (epctl & DXEPCTL_EPTYPE_BULK)) { int dctl = readl(hsotg->regs + DCTL); dctl |= DCTL_CGNPINNAK; writel(dctl, hsotg->regs + DCTL); } } } if (ints & DXEPINT_AHBERR) dev_dbg(hsotg->dev, "%s: AHBErr\n", __func__); if (ints & DXEPINT_SETUP) { /* Setup or Timeout */ dev_dbg(hsotg->dev, "%s: Setup/Timeout\n", __func__); if (using_dma(hsotg) && idx == 0) { /* * this is the notification we've received a * setup packet. In non-DMA mode we'd get this * from the RXFIFO, instead we need to process * the setup here. */ if (dir_in) WARN_ON_ONCE(1); else s3c_hsotg_handle_outdone(hsotg, 0); } } if (ints & DXEPINT_BACK2BACKSETUP) dev_dbg(hsotg->dev, "%s: B2BSetup/INEPNakEff\n", __func__); if (dir_in && !hs_ep->isochronous) { /* not sure if this is important, but we'll clear it anyway */ if (ints & DIEPMSK_INTKNTXFEMPMSK) { dev_dbg(hsotg->dev, "%s: ep%d: INTknTXFEmpMsk\n", __func__, idx); } /* this probably means something bad is happening */ if (ints & DIEPMSK_INTKNEPMISMSK) { dev_warn(hsotg->dev, "%s: ep%d: INTknEP\n", __func__, idx); } /* FIFO has space or is empty (see GAHBCFG) */ if (hsotg->dedicated_fifos && ints & DIEPMSK_TXFIFOEMPTY) { dev_dbg(hsotg->dev, "%s: ep%d: TxFIFOEmpty\n", __func__, idx); if (!using_dma(hsotg)) s3c_hsotg_trytx(hsotg, hs_ep); } } } /** * s3c_hsotg_irq_enumdone - Handle EnumDone interrupt (enumeration done) * @hsotg: The device state. * * Handle updating the device settings after the enumeration phase has * been completed. */ static void s3c_hsotg_irq_enumdone(struct dwc2_hsotg *hsotg) { u32 dsts = readl(hsotg->regs + DSTS); int ep0_mps = 0, ep_mps = 8; /* * This should signal the finish of the enumeration phase * of the USB handshaking, so we should now know what rate * we connected at. */ dev_dbg(hsotg->dev, "EnumDone (DSTS=0x%08x)\n", dsts); /* * note, since we're limited by the size of transfer on EP0, and * it seems IN transfers must be a even number of packets we do * not advertise a 64byte MPS on EP0. */ /* catch both EnumSpd_FS and EnumSpd_FS48 */ switch (dsts & DSTS_ENUMSPD_MASK) { case DSTS_ENUMSPD_FS: case DSTS_ENUMSPD_FS48: hsotg->gadget.speed = USB_SPEED_FULL; ep0_mps = EP0_MPS_LIMIT; ep_mps = 1023; break; case DSTS_ENUMSPD_HS: hsotg->gadget.speed = USB_SPEED_HIGH; ep0_mps = EP0_MPS_LIMIT; ep_mps = 1024; break; case DSTS_ENUMSPD_LS: hsotg->gadget.speed = USB_SPEED_LOW; /* * note, we don't actually support LS in this driver at the * moment, and the documentation seems to imply that it isn't * supported by the PHYs on some of the devices. */ break; } dev_info(hsotg->dev, "new device is %s\n", usb_speed_string(hsotg->gadget.speed)); /* * we should now know the maximum packet size for an * endpoint, so set the endpoints to a default value. */ if (ep0_mps) { int i; /* Initialize ep0 for both in and out directions */ s3c_hsotg_set_ep_maxpacket(hsotg, 0, ep0_mps, 1); s3c_hsotg_set_ep_maxpacket(hsotg, 0, ep0_mps, 0); for (i = 1; i < hsotg->num_of_eps; i++) { if (hsotg->eps_in[i]) s3c_hsotg_set_ep_maxpacket(hsotg, i, ep_mps, 1); if (hsotg->eps_out[i]) s3c_hsotg_set_ep_maxpacket(hsotg, i, ep_mps, 0); } } /* ensure after enumeration our EP0 is active */ s3c_hsotg_enqueue_setup(hsotg); dev_dbg(hsotg->dev, "EP0: DIEPCTL0=0x%08x, DOEPCTL0=0x%08x\n", readl(hsotg->regs + DIEPCTL0), readl(hsotg->regs + DOEPCTL0)); } /** * kill_all_requests - remove all requests from the endpoint's queue * @hsotg: The device state. * @ep: The endpoint the requests may be on. * @result: The result code to use. * * Go through the requests on the given endpoint and mark them * completed with the given result code. */ static void kill_all_requests(struct dwc2_hsotg *hsotg, struct s3c_hsotg_ep *ep, int result) { struct s3c_hsotg_req *req, *treq; unsigned size; ep->req = NULL; list_for_each_entry_safe(req, treq, &ep->queue, queue) s3c_hsotg_complete_request(hsotg, ep, req, result); if (!hsotg->dedicated_fifos) return; size = (readl(hsotg->regs + DTXFSTS(ep->index)) & 0xffff) * 4; if (size < ep->fifo_size) s3c_hsotg_txfifo_flush(hsotg, ep->fifo_index); } /** * s3c_hsotg_disconnect - disconnect service * @hsotg: The device state. * * The device has been disconnected. Remove all current * transactions and signal the gadget driver that this * has happened. */ void s3c_hsotg_disconnect(struct dwc2_hsotg *hsotg) { unsigned ep; if (!hsotg->connected) return; hsotg->connected = 0; for (ep = 0; ep < hsotg->num_of_eps; ep++) { if (hsotg->eps_in[ep]) kill_all_requests(hsotg, hsotg->eps_in[ep], -ESHUTDOWN); if (hsotg->eps_out[ep]) kill_all_requests(hsotg, hsotg->eps_out[ep], -ESHUTDOWN); } call_gadget(hsotg, disconnect); } EXPORT_SYMBOL_GPL(s3c_hsotg_disconnect); /** * s3c_hsotg_irq_fifoempty - TX FIFO empty interrupt handler * @hsotg: The device state: * @periodic: True if this is a periodic FIFO interrupt */ static void s3c_hsotg_irq_fifoempty(struct dwc2_hsotg *hsotg, bool periodic) { struct s3c_hsotg_ep *ep; int epno, ret; /* look through for any more data to transmit */ for (epno = 0; epno < hsotg->num_of_eps; epno++) { ep = index_to_ep(hsotg, epno, 1); if (!ep) continue; if (!ep->dir_in) continue; if ((periodic && !ep->periodic) || (!periodic && ep->periodic)) continue; ret = s3c_hsotg_trytx(hsotg, ep); if (ret < 0) break; } } /* IRQ flags which will trigger a retry around the IRQ loop */ #define IRQ_RETRY_MASK (GINTSTS_NPTXFEMP | \ GINTSTS_PTXFEMP | \ GINTSTS_RXFLVL) /** * s3c_hsotg_corereset - issue softreset to the core * @hsotg: The device state * * Issue a soft reset to the core, and await the core finishing it. */ static int s3c_hsotg_corereset(struct dwc2_hsotg *hsotg) { int timeout; u32 grstctl; dev_dbg(hsotg->dev, "resetting core\n"); /* issue soft reset */ writel(GRSTCTL_CSFTRST, hsotg->regs + GRSTCTL); timeout = 10000; do { grstctl = readl(hsotg->regs + GRSTCTL); } while ((grstctl & GRSTCTL_CSFTRST) && timeout-- > 0); if (grstctl & GRSTCTL_CSFTRST) { dev_err(hsotg->dev, "Failed to get CSftRst asserted\n"); return -EINVAL; } timeout = 10000; while (1) { u32 grstctl = readl(hsotg->regs + GRSTCTL); if (timeout-- < 0) { dev_info(hsotg->dev, "%s: reset failed, GRSTCTL=%08x\n", __func__, grstctl); return -ETIMEDOUT; } if (!(grstctl & GRSTCTL_AHBIDLE)) continue; break; /* reset done */ } dev_dbg(hsotg->dev, "reset successful\n"); return 0; } /** * s3c_hsotg_core_init - issue softreset to the core * @hsotg: The device state * * Issue a soft reset to the core, and await the core finishing it. */ void s3c_hsotg_core_init_disconnected(struct dwc2_hsotg *hsotg) { s3c_hsotg_corereset(hsotg); /* * we must now enable ep0 ready for host detection and then * set configuration. */ /* set the PLL on, remove the HNP/SRP and set the PHY */ writel(hsotg->phyif | GUSBCFG_TOUTCAL(7) | (0x5 << 10), hsotg->regs + GUSBCFG); s3c_hsotg_init_fifo(hsotg); __orr32(hsotg->regs + DCTL, DCTL_SFTDISCON); writel(1 << 18 | DCFG_DEVSPD_HS, hsotg->regs + DCFG); /* Clear any pending OTG interrupts */ writel(0xffffffff, hsotg->regs + GOTGINT); /* Clear any pending interrupts */ writel(0xffffffff, hsotg->regs + GINTSTS); writel(GINTSTS_ERLYSUSP | GINTSTS_SESSREQINT | GINTSTS_GOUTNAKEFF | GINTSTS_GINNAKEFF | GINTSTS_CONIDSTSCHNG | GINTSTS_USBRST | GINTSTS_ENUMDONE | GINTSTS_OTGINT | GINTSTS_USBSUSP | GINTSTS_WKUPINT, hsotg->regs + GINTMSK); if (using_dma(hsotg)) writel(GAHBCFG_GLBL_INTR_EN | GAHBCFG_DMA_EN | (GAHBCFG_HBSTLEN_INCR4 << GAHBCFG_HBSTLEN_SHIFT), hsotg->regs + GAHBCFG); else writel(((hsotg->dedicated_fifos) ? (GAHBCFG_NP_TXF_EMP_LVL | GAHBCFG_P_TXF_EMP_LVL) : 0) | GAHBCFG_GLBL_INTR_EN, hsotg->regs + GAHBCFG); /* * If INTknTXFEmpMsk is enabled, it's important to disable ep interrupts * when we have no data to transfer. Otherwise we get being flooded by * interrupts. */ writel(((hsotg->dedicated_fifos && !using_dma(hsotg)) ? DIEPMSK_TXFIFOEMPTY | DIEPMSK_INTKNTXFEMPMSK : 0) | DIEPMSK_EPDISBLDMSK | DIEPMSK_XFERCOMPLMSK | DIEPMSK_TIMEOUTMSK | DIEPMSK_AHBERRMSK | DIEPMSK_INTKNEPMISMSK, hsotg->regs + DIEPMSK); /* * don't need XferCompl, we get that from RXFIFO in slave mode. In * DMA mode we may need this. */ writel((using_dma(hsotg) ? (DIEPMSK_XFERCOMPLMSK | DIEPMSK_TIMEOUTMSK) : 0) | DOEPMSK_EPDISBLDMSK | DOEPMSK_AHBERRMSK | DOEPMSK_SETUPMSK, hsotg->regs + DOEPMSK); writel(0, hsotg->regs + DAINTMSK); dev_dbg(hsotg->dev, "EP0: DIEPCTL0=0x%08x, DOEPCTL0=0x%08x\n", readl(hsotg->regs + DIEPCTL0), readl(hsotg->regs + DOEPCTL0)); /* enable in and out endpoint interrupts */ s3c_hsotg_en_gsint(hsotg, GINTSTS_OEPINT | GINTSTS_IEPINT); /* * Enable the RXFIFO when in slave mode, as this is how we collect * the data. In DMA mode, we get events from the FIFO but also * things we cannot process, so do not use it. */ if (!using_dma(hsotg)) s3c_hsotg_en_gsint(hsotg, GINTSTS_RXFLVL); /* Enable interrupts for EP0 in and out */ s3c_hsotg_ctrl_epint(hsotg, 0, 0, 1); s3c_hsotg_ctrl_epint(hsotg, 0, 1, 1); __orr32(hsotg->regs + DCTL, DCTL_PWRONPRGDONE); udelay(10); /* see openiboot */ __bic32(hsotg->regs + DCTL, DCTL_PWRONPRGDONE); dev_dbg(hsotg->dev, "DCTL=0x%08x\n", readl(hsotg->regs + DCTL)); /* * DxEPCTL_USBActEp says RO in manual, but seems to be set by * writing to the EPCTL register.. */ /* set to read 1 8byte packet */ writel(DXEPTSIZ_MC(1) | DXEPTSIZ_PKTCNT(1) | DXEPTSIZ_XFERSIZE(8), hsotg->regs + DOEPTSIZ0); writel(s3c_hsotg_ep0_mps(hsotg->eps_out[0]->ep.maxpacket) | DXEPCTL_CNAK | DXEPCTL_EPENA | DXEPCTL_USBACTEP, hsotg->regs + DOEPCTL0); /* enable, but don't activate EP0in */ writel(s3c_hsotg_ep0_mps(hsotg->eps_out[0]->ep.maxpacket) | DXEPCTL_USBACTEP, hsotg->regs + DIEPCTL0); s3c_hsotg_enqueue_setup(hsotg); dev_dbg(hsotg->dev, "EP0: DIEPCTL0=0x%08x, DOEPCTL0=0x%08x\n", readl(hsotg->regs + DIEPCTL0), readl(hsotg->regs + DOEPCTL0)); /* clear global NAKs */ writel(DCTL_CGOUTNAK | DCTL_CGNPINNAK | DCTL_SFTDISCON, hsotg->regs + DCTL); /* must be at-least 3ms to allow bus to see disconnect */ mdelay(3); hsotg->last_rst = jiffies; } static void s3c_hsotg_core_disconnect(struct dwc2_hsotg *hsotg) { /* set the soft-disconnect bit */ __orr32(hsotg->regs + DCTL, DCTL_SFTDISCON); } void s3c_hsotg_core_connect(struct dwc2_hsotg *hsotg) { /* remove the soft-disconnect and let's go */ __bic32(hsotg->regs + DCTL, DCTL_SFTDISCON); } /** * s3c_hsotg_irq - handle device interrupt * @irq: The IRQ number triggered * @pw: The pw value when registered the handler. */ static irqreturn_t s3c_hsotg_irq(int irq, void *pw) { struct dwc2_hsotg *hsotg = pw; int retry_count = 8; u32 gintsts; u32 gintmsk; spin_lock(&hsotg->lock); irq_retry: gintsts = readl(hsotg->regs + GINTSTS); gintmsk = readl(hsotg->regs + GINTMSK); dev_dbg(hsotg->dev, "%s: %08x %08x (%08x) retry %d\n", __func__, gintsts, gintsts & gintmsk, gintmsk, retry_count); gintsts &= gintmsk; if (gintsts & GINTSTS_ENUMDONE) { writel(GINTSTS_ENUMDONE, hsotg->regs + GINTSTS); s3c_hsotg_irq_enumdone(hsotg); hsotg->connected = 1; } if (gintsts & (GINTSTS_OEPINT | GINTSTS_IEPINT)) { u32 daint = readl(hsotg->regs + DAINT); u32 daintmsk = readl(hsotg->regs + DAINTMSK); u32 daint_out, daint_in; int ep; daint &= daintmsk; daint_out = daint >> DAINT_OUTEP_SHIFT; daint_in = daint & ~(daint_out << DAINT_OUTEP_SHIFT); dev_dbg(hsotg->dev, "%s: daint=%08x\n", __func__, daint); for (ep = 0; ep < hsotg->num_of_eps && daint_out; ep++, daint_out >>= 1) { if (daint_out & 1) s3c_hsotg_epint(hsotg, ep, 0); } for (ep = 0; ep < hsotg->num_of_eps && daint_in; ep++, daint_in >>= 1) { if (daint_in & 1) s3c_hsotg_epint(hsotg, ep, 1); } } if (gintsts & GINTSTS_USBRST) { u32 usb_status = readl(hsotg->regs + GOTGCTL); dev_dbg(hsotg->dev, "%s: USBRst\n", __func__); dev_dbg(hsotg->dev, "GNPTXSTS=%08x\n", readl(hsotg->regs + GNPTXSTS)); writel(GINTSTS_USBRST, hsotg->regs + GINTSTS); if (usb_status & GOTGCTL_BSESVLD) { if (time_after(jiffies, hsotg->last_rst + msecs_to_jiffies(200))) { kill_all_requests(hsotg, hsotg->eps_out[0], -ECONNRESET); s3c_hsotg_core_init_disconnected(hsotg); s3c_hsotg_core_connect(hsotg); } } } /* check both FIFOs */ if (gintsts & GINTSTS_NPTXFEMP) { dev_dbg(hsotg->dev, "NPTxFEmp\n"); /* * Disable the interrupt to stop it happening again * unless one of these endpoint routines decides that * it needs re-enabling */ s3c_hsotg_disable_gsint(hsotg, GINTSTS_NPTXFEMP); s3c_hsotg_irq_fifoempty(hsotg, false); } if (gintsts & GINTSTS_PTXFEMP) { dev_dbg(hsotg->dev, "PTxFEmp\n"); /* See note in GINTSTS_NPTxFEmp */ s3c_hsotg_disable_gsint(hsotg, GINTSTS_PTXFEMP); s3c_hsotg_irq_fifoempty(hsotg, true); } if (gintsts & GINTSTS_RXFLVL) { /* * note, since GINTSTS_RxFLvl doubles as FIFO-not-empty, * we need to retry s3c_hsotg_handle_rx if this is still * set. */ s3c_hsotg_handle_rx(hsotg); } if (gintsts & GINTSTS_ERLYSUSP) { dev_dbg(hsotg->dev, "GINTSTS_ErlySusp\n"); writel(GINTSTS_ERLYSUSP, hsotg->regs + GINTSTS); } /* * these next two seem to crop-up occasionally causing the core * to shutdown the USB transfer, so try clearing them and logging * the occurrence. */ if (gintsts & GINTSTS_GOUTNAKEFF) { dev_info(hsotg->dev, "GOUTNakEff triggered\n"); writel(DCTL_CGOUTNAK, hsotg->regs + DCTL); s3c_hsotg_dump(hsotg); } if (gintsts & GINTSTS_GINNAKEFF) { dev_info(hsotg->dev, "GINNakEff triggered\n"); writel(DCTL_CGNPINNAK, hsotg->regs + DCTL); s3c_hsotg_dump(hsotg); } /* * if we've had fifo events, we should try and go around the * loop again to see if there's any point in returning yet. */ if (gintsts & IRQ_RETRY_MASK && --retry_count > 0) goto irq_retry; spin_unlock(&hsotg->lock); return IRQ_HANDLED; } /** * s3c_hsotg_ep_enable - enable the given endpoint * @ep: The USB endpint to configure * @desc: The USB endpoint descriptor to configure with. * * This is called from the USB gadget code's usb_ep_enable(). */ static int s3c_hsotg_ep_enable(struct usb_ep *ep, const struct usb_endpoint_descriptor *desc) { struct s3c_hsotg_ep *hs_ep = our_ep(ep); struct dwc2_hsotg *hsotg = hs_ep->parent; unsigned long flags; int index = hs_ep->index; u32 epctrl_reg; u32 epctrl; u32 mps; int dir_in; int i, val, size; int ret = 0; dev_dbg(hsotg->dev, "%s: ep %s: a 0x%02x, attr 0x%02x, mps 0x%04x, intr %d\n", __func__, ep->name, desc->bEndpointAddress, desc->bmAttributes, desc->wMaxPacketSize, desc->bInterval); /* not to be called for EP0 */ WARN_ON(index == 0); dir_in = (desc->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ? 1 : 0; if (dir_in != hs_ep->dir_in) { dev_err(hsotg->dev, "%s: direction mismatch!\n", __func__); return -EINVAL; } mps = usb_endpoint_maxp(desc); /* note, we handle this here instead of s3c_hsotg_set_ep_maxpacket */ epctrl_reg = dir_in ? DIEPCTL(index) : DOEPCTL(index); epctrl = readl(hsotg->regs + epctrl_reg); dev_dbg(hsotg->dev, "%s: read DxEPCTL=0x%08x from 0x%08x\n", __func__, epctrl, epctrl_reg); spin_lock_irqsave(&hsotg->lock, flags); epctrl &= ~(DXEPCTL_EPTYPE_MASK | DXEPCTL_MPS_MASK); epctrl |= DXEPCTL_MPS(mps); /* * mark the endpoint as active, otherwise the core may ignore * transactions entirely for this endpoint */ epctrl |= DXEPCTL_USBACTEP; /* * set the NAK status on the endpoint, otherwise we might try and * do something with data that we've yet got a request to process * since the RXFIFO will take data for an endpoint even if the * size register hasn't been set. */ epctrl |= DXEPCTL_SNAK; /* update the endpoint state */ s3c_hsotg_set_ep_maxpacket(hsotg, hs_ep->index, mps, dir_in); /* default, set to non-periodic */ hs_ep->isochronous = 0; hs_ep->periodic = 0; hs_ep->halted = 0; hs_ep->interval = desc->bInterval; if (hs_ep->interval > 1 && hs_ep->mc > 1) dev_err(hsotg->dev, "MC > 1 when interval is not 1\n"); switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) { case USB_ENDPOINT_XFER_ISOC: epctrl |= DXEPCTL_EPTYPE_ISO; epctrl |= DXEPCTL_SETEVENFR; hs_ep->isochronous = 1; if (dir_in) hs_ep->periodic = 1; break; case USB_ENDPOINT_XFER_BULK: epctrl |= DXEPCTL_EPTYPE_BULK; break; case USB_ENDPOINT_XFER_INT: if (dir_in) hs_ep->periodic = 1; epctrl |= DXEPCTL_EPTYPE_INTERRUPT; break; case USB_ENDPOINT_XFER_CONTROL: epctrl |= DXEPCTL_EPTYPE_CONTROL; break; } /* * if the hardware has dedicated fifos, we must give each IN EP * a unique tx-fifo even if it is non-periodic. */ if (dir_in && hsotg->dedicated_fifos) { size = hs_ep->ep.maxpacket*hs_ep->mc; for (i = 1; i < hsotg->num_of_eps; ++i) { if (hsotg->fifo_map & (1<regs + DPTXFSIZN(i)); val = (val >> FIFOSIZE_DEPTH_SHIFT)*4; if (val < size) continue; hsotg->fifo_map |= 1<fifo_index = i; hs_ep->fifo_size = val; break; } if (i == hsotg->num_of_eps) { dev_err(hsotg->dev, "%s: No suitable fifo found\n", __func__); ret = -ENOMEM; goto error; } } /* for non control endpoints, set PID to D0 */ if (index) epctrl |= DXEPCTL_SETD0PID; dev_dbg(hsotg->dev, "%s: write DxEPCTL=0x%08x\n", __func__, epctrl); writel(epctrl, hsotg->regs + epctrl_reg); dev_dbg(hsotg->dev, "%s: read DxEPCTL=0x%08x\n", __func__, readl(hsotg->regs + epctrl_reg)); /* enable the endpoint interrupt */ s3c_hsotg_ctrl_epint(hsotg, index, dir_in, 1); error: spin_unlock_irqrestore(&hsotg->lock, flags); return ret; } /** * s3c_hsotg_ep_disable - disable given endpoint * @ep: The endpoint to disable. */ static int s3c_hsotg_ep_disable(struct usb_ep *ep) { struct s3c_hsotg_ep *hs_ep = our_ep(ep); struct dwc2_hsotg *hsotg = hs_ep->parent; int dir_in = hs_ep->dir_in; int index = hs_ep->index; unsigned long flags; u32 epctrl_reg; u32 ctrl; dev_dbg(hsotg->dev, "%s(ep %p)\n", __func__, ep); if (ep == &hsotg->eps_out[0]->ep) { dev_err(hsotg->dev, "%s: called for ep0\n", __func__); return -EINVAL; } epctrl_reg = dir_in ? DIEPCTL(index) : DOEPCTL(index); spin_lock_irqsave(&hsotg->lock, flags); hsotg->fifo_map &= ~(1<fifo_index); hs_ep->fifo_index = 0; hs_ep->fifo_size = 0; ctrl = readl(hsotg->regs + epctrl_reg); ctrl &= ~DXEPCTL_EPENA; ctrl &= ~DXEPCTL_USBACTEP; ctrl |= DXEPCTL_SNAK; dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x\n", __func__, ctrl); writel(ctrl, hsotg->regs + epctrl_reg); /* disable endpoint interrupts */ s3c_hsotg_ctrl_epint(hsotg, hs_ep->index, hs_ep->dir_in, 0); /* terminate all requests with shutdown */ kill_all_requests(hsotg, hs_ep, -ESHUTDOWN); spin_unlock_irqrestore(&hsotg->lock, flags); return 0; } /** * on_list - check request is on the given endpoint * @ep: The endpoint to check. * @test: The request to test if it is on the endpoint. */ static bool on_list(struct s3c_hsotg_ep *ep, struct s3c_hsotg_req *test) { struct s3c_hsotg_req *req, *treq; list_for_each_entry_safe(req, treq, &ep->queue, queue) { if (req == test) return true; } return false; } /** * s3c_hsotg_ep_dequeue - dequeue given endpoint * @ep: The endpoint to dequeue. * @req: The request to be removed from a queue. */ static int s3c_hsotg_ep_dequeue(struct usb_ep *ep, struct usb_request *req) { struct s3c_hsotg_req *hs_req = our_req(req); struct s3c_hsotg_ep *hs_ep = our_ep(ep); struct dwc2_hsotg *hs = hs_ep->parent; unsigned long flags; dev_dbg(hs->dev, "ep_dequeue(%p,%p)\n", ep, req); spin_lock_irqsave(&hs->lock, flags); if (!on_list(hs_ep, hs_req)) { spin_unlock_irqrestore(&hs->lock, flags); return -EINVAL; } s3c_hsotg_complete_request(hs, hs_ep, hs_req, -ECONNRESET); spin_unlock_irqrestore(&hs->lock, flags); return 0; } /** * s3c_hsotg_ep_sethalt - set halt on a given endpoint * @ep: The endpoint to set halt. * @value: Set or unset the halt. */ static int s3c_hsotg_ep_sethalt(struct usb_ep *ep, int value) { struct s3c_hsotg_ep *hs_ep = our_ep(ep); struct dwc2_hsotg *hs = hs_ep->parent; int index = hs_ep->index; u32 epreg; u32 epctl; u32 xfertype; dev_info(hs->dev, "%s(ep %p %s, %d)\n", __func__, ep, ep->name, value); if (index == 0) { if (value) s3c_hsotg_stall_ep0(hs); else dev_warn(hs->dev, "%s: can't clear halt on ep0\n", __func__); return 0; } if (hs_ep->dir_in) { epreg = DIEPCTL(index); epctl = readl(hs->regs + epreg); if (value) { epctl |= DXEPCTL_STALL + DXEPCTL_SNAK; if (epctl & DXEPCTL_EPENA) epctl |= DXEPCTL_EPDIS; } else { epctl &= ~DXEPCTL_STALL; xfertype = epctl & DXEPCTL_EPTYPE_MASK; if (xfertype == DXEPCTL_EPTYPE_BULK || xfertype == DXEPCTL_EPTYPE_INTERRUPT) epctl |= DXEPCTL_SETD0PID; } writel(epctl, hs->regs + epreg); } else { epreg = DOEPCTL(index); epctl = readl(hs->regs + epreg); if (value) epctl |= DXEPCTL_STALL; else { epctl &= ~DXEPCTL_STALL; xfertype = epctl & DXEPCTL_EPTYPE_MASK; if (xfertype == DXEPCTL_EPTYPE_BULK || xfertype == DXEPCTL_EPTYPE_INTERRUPT) epctl |= DXEPCTL_SETD0PID; } writel(epctl, hs->regs + epreg); } hs_ep->halted = value; return 0; } /** * s3c_hsotg_ep_sethalt_lock - set halt on a given endpoint with lock held * @ep: The endpoint to set halt. * @value: Set or unset the halt. */ static int s3c_hsotg_ep_sethalt_lock(struct usb_ep *ep, int value) { struct s3c_hsotg_ep *hs_ep = our_ep(ep); struct dwc2_hsotg *hs = hs_ep->parent; unsigned long flags = 0; int ret = 0; spin_lock_irqsave(&hs->lock, flags); ret = s3c_hsotg_ep_sethalt(ep, value); spin_unlock_irqrestore(&hs->lock, flags); return ret; } static struct usb_ep_ops s3c_hsotg_ep_ops = { .enable = s3c_hsotg_ep_enable, .disable = s3c_hsotg_ep_disable, .alloc_request = s3c_hsotg_ep_alloc_request, .free_request = s3c_hsotg_ep_free_request, .queue = s3c_hsotg_ep_queue_lock, .dequeue = s3c_hsotg_ep_dequeue, .set_halt = s3c_hsotg_ep_sethalt_lock, /* note, don't believe we have any call for the fifo routines */ }; /** * s3c_hsotg_phy_enable - enable platform phy dev * @hsotg: The driver state * * A wrapper for platform code responsible for controlling * low-level USB code */ static void s3c_hsotg_phy_enable(struct dwc2_hsotg *hsotg) { struct platform_device *pdev = to_platform_device(hsotg->dev); dev_dbg(hsotg->dev, "pdev 0x%p\n", pdev); if (hsotg->uphy) usb_phy_init(hsotg->uphy); else if (hsotg->plat && hsotg->plat->phy_init) hsotg->plat->phy_init(pdev, hsotg->plat->phy_type); else { phy_init(hsotg->phy); phy_power_on(hsotg->phy); } } /** * s3c_hsotg_phy_disable - disable platform phy dev * @hsotg: The driver state * * A wrapper for platform code responsible for controlling * low-level USB code */ static void s3c_hsotg_phy_disable(struct dwc2_hsotg *hsotg) { struct platform_device *pdev = to_platform_device(hsotg->dev); if (hsotg->uphy) usb_phy_shutdown(hsotg->uphy); else if (hsotg->plat && hsotg->plat->phy_exit) hsotg->plat->phy_exit(pdev, hsotg->plat->phy_type); else { phy_power_off(hsotg->phy); phy_exit(hsotg->phy); } } /** * s3c_hsotg_init - initalize the usb core * @hsotg: The driver state */ static void s3c_hsotg_init(struct dwc2_hsotg *hsotg) { /* unmask subset of endpoint interrupts */ writel(DIEPMSK_TIMEOUTMSK | DIEPMSK_AHBERRMSK | DIEPMSK_EPDISBLDMSK | DIEPMSK_XFERCOMPLMSK, hsotg->regs + DIEPMSK); writel(DOEPMSK_SETUPMSK | DOEPMSK_AHBERRMSK | DOEPMSK_EPDISBLDMSK | DOEPMSK_XFERCOMPLMSK, hsotg->regs + DOEPMSK); writel(0, hsotg->regs + DAINTMSK); /* Be in disconnected state until gadget is registered */ __orr32(hsotg->regs + DCTL, DCTL_SFTDISCON); if (0) { /* post global nak until we're ready */ writel(DCTL_SGNPINNAK | DCTL_SGOUTNAK, hsotg->regs + DCTL); } /* setup fifos */ dev_dbg(hsotg->dev, "GRXFSIZ=0x%08x, GNPTXFSIZ=0x%08x\n", readl(hsotg->regs + GRXFSIZ), readl(hsotg->regs + GNPTXFSIZ)); s3c_hsotg_init_fifo(hsotg); /* set the PLL on, remove the HNP/SRP and set the PHY */ writel(GUSBCFG_PHYIF16 | GUSBCFG_TOUTCAL(7) | (0x5 << 10), hsotg->regs + GUSBCFG); if (using_dma(hsotg)) __orr32(hsotg->regs + GAHBCFG, GAHBCFG_DMA_EN); } /** * s3c_hsotg_udc_start - prepare the udc for work * @gadget: The usb gadget state * @driver: The usb gadget driver * * Perform initialization to prepare udc device and driver * to work. */ static int s3c_hsotg_udc_start(struct usb_gadget *gadget, struct usb_gadget_driver *driver) { struct dwc2_hsotg *hsotg = to_hsotg(gadget); unsigned long flags; int ret; if (!hsotg) { pr_err("%s: called with no device\n", __func__); return -ENODEV; } if (!driver) { dev_err(hsotg->dev, "%s: no driver\n", __func__); return -EINVAL; } if (driver->max_speed < USB_SPEED_FULL) dev_err(hsotg->dev, "%s: bad speed\n", __func__); if (!driver->setup) { dev_err(hsotg->dev, "%s: missing entry points\n", __func__); return -EINVAL; } mutex_lock(&hsotg->init_mutex); WARN_ON(hsotg->driver); driver->driver.bus = NULL; hsotg->driver = driver; hsotg->gadget.dev.of_node = hsotg->dev->of_node; hsotg->gadget.speed = USB_SPEED_UNKNOWN; clk_enable(hsotg->clk); ret = regulator_bulk_enable(ARRAY_SIZE(hsotg->supplies), hsotg->supplies); if (ret) { dev_err(hsotg->dev, "failed to enable supplies: %d\n", ret); goto err; } s3c_hsotg_phy_enable(hsotg); if (!IS_ERR_OR_NULL(hsotg->uphy)) otg_set_peripheral(hsotg->uphy->otg, &hsotg->gadget); spin_lock_irqsave(&hsotg->lock, flags); s3c_hsotg_init(hsotg); s3c_hsotg_core_init_disconnected(hsotg); hsotg->enabled = 0; spin_unlock_irqrestore(&hsotg->lock, flags); dev_info(hsotg->dev, "bound driver %s\n", driver->driver.name); mutex_unlock(&hsotg->init_mutex); return 0; err: mutex_unlock(&hsotg->init_mutex); hsotg->driver = NULL; return ret; } /** * s3c_hsotg_udc_stop - stop the udc * @gadget: The usb gadget state * @driver: The usb gadget driver * * Stop udc hw block and stay tunned for future transmissions */ static int s3c_hsotg_udc_stop(struct usb_gadget *gadget) { struct dwc2_hsotg *hsotg = to_hsotg(gadget); unsigned long flags = 0; int ep; if (!hsotg) return -ENODEV; mutex_lock(&hsotg->init_mutex); /* all endpoints should be shutdown */ for (ep = 1; ep < hsotg->num_of_eps; ep++) { if (hsotg->eps_in[ep]) s3c_hsotg_ep_disable(&hsotg->eps_in[ep]->ep); if (hsotg->eps_out[ep]) s3c_hsotg_ep_disable(&hsotg->eps_out[ep]->ep); } spin_lock_irqsave(&hsotg->lock, flags); hsotg->driver = NULL; hsotg->gadget.speed = USB_SPEED_UNKNOWN; hsotg->enabled = 0; spin_unlock_irqrestore(&hsotg->lock, flags); if (!IS_ERR_OR_NULL(hsotg->uphy)) otg_set_peripheral(hsotg->uphy->otg, NULL); s3c_hsotg_phy_disable(hsotg); regulator_bulk_disable(ARRAY_SIZE(hsotg->supplies), hsotg->supplies); clk_disable(hsotg->clk); mutex_unlock(&hsotg->init_mutex); return 0; } /** * s3c_hsotg_gadget_getframe - read the frame number * @gadget: The usb gadget state * * Read the {micro} frame number */ static int s3c_hsotg_gadget_getframe(struct usb_gadget *gadget) { return s3c_hsotg_read_frameno(to_hsotg(gadget)); } /** * s3c_hsotg_pullup - connect/disconnect the USB PHY * @gadget: The usb gadget state * @is_on: Current state of the USB PHY * * Connect/Disconnect the USB PHY pullup */ static int s3c_hsotg_pullup(struct usb_gadget *gadget, int is_on) { struct dwc2_hsotg *hsotg = to_hsotg(gadget); unsigned long flags = 0; dev_dbg(hsotg->dev, "%s: is_on: %d\n", __func__, is_on); mutex_lock(&hsotg->init_mutex); spin_lock_irqsave(&hsotg->lock, flags); if (is_on) { clk_enable(hsotg->clk); hsotg->enabled = 1; s3c_hsotg_core_connect(hsotg); } else { s3c_hsotg_core_disconnect(hsotg); hsotg->enabled = 0; clk_disable(hsotg->clk); } hsotg->gadget.speed = USB_SPEED_UNKNOWN; spin_unlock_irqrestore(&hsotg->lock, flags); mutex_unlock(&hsotg->init_mutex); return 0; } static const struct usb_gadget_ops s3c_hsotg_gadget_ops = { .get_frame = s3c_hsotg_gadget_getframe, .udc_start = s3c_hsotg_udc_start, .udc_stop = s3c_hsotg_udc_stop, .pullup = s3c_hsotg_pullup, }; /** * s3c_hsotg_initep - initialise a single endpoint * @hsotg: The device state. * @hs_ep: The endpoint to be initialised. * @epnum: The endpoint number * * Initialise the given endpoint (as part of the probe and device state * creation) to give to the gadget driver. Setup the endpoint name, any * direction information and other state that may be required. */ static void s3c_hsotg_initep(struct dwc2_hsotg *hsotg, struct s3c_hsotg_ep *hs_ep, int epnum, bool dir_in) { char *dir; if (epnum == 0) dir = ""; else if (dir_in) dir = "in"; else dir = "out"; hs_ep->dir_in = dir_in; hs_ep->index = epnum; snprintf(hs_ep->name, sizeof(hs_ep->name), "ep%d%s", epnum, dir); INIT_LIST_HEAD(&hs_ep->queue); INIT_LIST_HEAD(&hs_ep->ep.ep_list); /* add to the list of endpoints known by the gadget driver */ if (epnum) list_add_tail(&hs_ep->ep.ep_list, &hsotg->gadget.ep_list); hs_ep->parent = hsotg; hs_ep->ep.name = hs_ep->name; usb_ep_set_maxpacket_limit(&hs_ep->ep, epnum ? 1024 : EP0_MPS_LIMIT); hs_ep->ep.ops = &s3c_hsotg_ep_ops; /* * if we're using dma, we need to set the next-endpoint pointer * to be something valid. */ if (using_dma(hsotg)) { u32 next = DXEPCTL_NEXTEP((epnum + 1) % 15); if (dir_in) writel(next, hsotg->regs + DIEPCTL(epnum)); else writel(next, hsotg->regs + DOEPCTL(epnum)); } } /** * s3c_hsotg_hw_cfg - read HW configuration registers * @param: The device state * * Read the USB core HW configuration registers */ static int s3c_hsotg_hw_cfg(struct dwc2_hsotg *hsotg) { u32 cfg; u32 ep_type; u32 i; /* check hardware configuration */ cfg = readl(hsotg->regs + GHWCFG2); hsotg->num_of_eps = (cfg >> 10) & 0xF; /* Add ep0 */ hsotg->num_of_eps++; hsotg->eps_in[0] = devm_kzalloc(hsotg->dev, sizeof(struct s3c_hsotg_ep), GFP_KERNEL); if (!hsotg->eps_in[0]) return -ENOMEM; /* Same s3c_hsotg_ep is used in both directions for ep0 */ hsotg->eps_out[0] = hsotg->eps_in[0]; cfg = readl(hsotg->regs + GHWCFG1); for (i = 1; i < hsotg->num_of_eps; i++, cfg >>= 2) { ep_type = cfg & 3; /* Direction in or both */ if (!(ep_type & 2)) { hsotg->eps_in[i] = devm_kzalloc(hsotg->dev, sizeof(struct s3c_hsotg_ep), GFP_KERNEL); if (!hsotg->eps_in[i]) return -ENOMEM; } /* Direction out or both */ if (!(ep_type & 1)) { hsotg->eps_out[i] = devm_kzalloc(hsotg->dev, sizeof(struct s3c_hsotg_ep), GFP_KERNEL); if (!hsotg->eps_out[i]) return -ENOMEM; } } cfg = readl(hsotg->regs + GHWCFG3); hsotg->fifo_mem = (cfg >> 16); cfg = readl(hsotg->regs + GHWCFG4); hsotg->dedicated_fifos = (cfg >> 25) & 1; dev_info(hsotg->dev, "EPs: %d, %s fifos, %d entries in SPRAM\n", hsotg->num_of_eps, hsotg->dedicated_fifos ? "dedicated" : "shared", hsotg->fifo_mem); return 0; } /** * s3c_hsotg_dump - dump state of the udc * @param: The device state */ static void s3c_hsotg_dump(struct dwc2_hsotg *hsotg) { #ifdef DEBUG struct device *dev = hsotg->dev; void __iomem *regs = hsotg->regs; u32 val; int idx; dev_info(dev, "DCFG=0x%08x, DCTL=0x%08x, DIEPMSK=%08x\n", readl(regs + DCFG), readl(regs + DCTL), readl(regs + DIEPMSK)); dev_info(dev, "GAHBCFG=0x%08x, 0x44=0x%08x\n", readl(regs + GAHBCFG), readl(regs + 0x44)); dev_info(dev, "GRXFSIZ=0x%08x, GNPTXFSIZ=0x%08x\n", readl(regs + GRXFSIZ), readl(regs + GNPTXFSIZ)); /* show periodic fifo settings */ for (idx = 1; idx < hsotg->num_of_eps; idx++) { val = readl(regs + DPTXFSIZN(idx)); dev_info(dev, "DPTx[%d] FSize=%d, StAddr=0x%08x\n", idx, val >> FIFOSIZE_DEPTH_SHIFT, val & FIFOSIZE_STARTADDR_MASK); } for (idx = 0; idx < hsotg->num_of_eps; idx++) { dev_info(dev, "ep%d-in: EPCTL=0x%08x, SIZ=0x%08x, DMA=0x%08x\n", idx, readl(regs + DIEPCTL(idx)), readl(regs + DIEPTSIZ(idx)), readl(regs + DIEPDMA(idx))); val = readl(regs + DOEPCTL(idx)); dev_info(dev, "ep%d-out: EPCTL=0x%08x, SIZ=0x%08x, DMA=0x%08x\n", idx, readl(regs + DOEPCTL(idx)), readl(regs + DOEPTSIZ(idx)), readl(regs + DOEPDMA(idx))); } dev_info(dev, "DVBUSDIS=0x%08x, DVBUSPULSE=%08x\n", readl(regs + DVBUSDIS), readl(regs + DVBUSPULSE)); #endif } /** * state_show - debugfs: show overall driver and device state. * @seq: The seq file to write to. * @v: Unused parameter. * * This debugfs entry shows the overall state of the hardware and * some general information about each of the endpoints available * to the system. */ static int state_show(struct seq_file *seq, void *v) { struct dwc2_hsotg *hsotg = seq->private; void __iomem *regs = hsotg->regs; int idx; seq_printf(seq, "DCFG=0x%08x, DCTL=0x%08x, DSTS=0x%08x\n", readl(regs + DCFG), readl(regs + DCTL), readl(regs + DSTS)); seq_printf(seq, "DIEPMSK=0x%08x, DOEPMASK=0x%08x\n", readl(regs + DIEPMSK), readl(regs + DOEPMSK)); seq_printf(seq, "GINTMSK=0x%08x, GINTSTS=0x%08x\n", readl(regs + GINTMSK), readl(regs + GINTSTS)); seq_printf(seq, "DAINTMSK=0x%08x, DAINT=0x%08x\n", readl(regs + DAINTMSK), readl(regs + DAINT)); seq_printf(seq, "GNPTXSTS=0x%08x, GRXSTSR=%08x\n", readl(regs + GNPTXSTS), readl(regs + GRXSTSR)); seq_puts(seq, "\nEndpoint status:\n"); for (idx = 0; idx < hsotg->num_of_eps; idx++) { u32 in, out; in = readl(regs + DIEPCTL(idx)); out = readl(regs + DOEPCTL(idx)); seq_printf(seq, "ep%d: DIEPCTL=0x%08x, DOEPCTL=0x%08x", idx, in, out); in = readl(regs + DIEPTSIZ(idx)); out = readl(regs + DOEPTSIZ(idx)); seq_printf(seq, ", DIEPTSIZ=0x%08x, DOEPTSIZ=0x%08x", in, out); seq_puts(seq, "\n"); } return 0; } static int state_open(struct inode *inode, struct file *file) { return single_open(file, state_show, inode->i_private); } static const struct file_operations state_fops = { .owner = THIS_MODULE, .open = state_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; /** * fifo_show - debugfs: show the fifo information * @seq: The seq_file to write data to. * @v: Unused parameter. * * Show the FIFO information for the overall fifo and all the * periodic transmission FIFOs. */ static int fifo_show(struct seq_file *seq, void *v) { struct dwc2_hsotg *hsotg = seq->private; void __iomem *regs = hsotg->regs; u32 val; int idx; seq_puts(seq, "Non-periodic FIFOs:\n"); seq_printf(seq, "RXFIFO: Size %d\n", readl(regs + GRXFSIZ)); val = readl(regs + GNPTXFSIZ); seq_printf(seq, "NPTXFIFO: Size %d, Start 0x%08x\n", val >> FIFOSIZE_DEPTH_SHIFT, val & FIFOSIZE_DEPTH_MASK); seq_puts(seq, "\nPeriodic TXFIFOs:\n"); for (idx = 1; idx < hsotg->num_of_eps; idx++) { val = readl(regs + DPTXFSIZN(idx)); seq_printf(seq, "\tDPTXFIFO%2d: Size %d, Start 0x%08x\n", idx, val >> FIFOSIZE_DEPTH_SHIFT, val & FIFOSIZE_STARTADDR_MASK); } return 0; } static int fifo_open(struct inode *inode, struct file *file) { return single_open(file, fifo_show, inode->i_private); } static const struct file_operations fifo_fops = { .owner = THIS_MODULE, .open = fifo_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static const char *decode_direction(int is_in) { return is_in ? "in" : "out"; } /** * ep_show - debugfs: show the state of an endpoint. * @seq: The seq_file to write data to. * @v: Unused parameter. * * This debugfs entry shows the state of the given endpoint (one is * registered for each available). */ static int ep_show(struct seq_file *seq, void *v) { struct s3c_hsotg_ep *ep = seq->private; struct dwc2_hsotg *hsotg = ep->parent; struct s3c_hsotg_req *req; void __iomem *regs = hsotg->regs; int index = ep->index; int show_limit = 15; unsigned long flags; seq_printf(seq, "Endpoint index %d, named %s, dir %s:\n", ep->index, ep->ep.name, decode_direction(ep->dir_in)); /* first show the register state */ seq_printf(seq, "\tDIEPCTL=0x%08x, DOEPCTL=0x%08x\n", readl(regs + DIEPCTL(index)), readl(regs + DOEPCTL(index))); seq_printf(seq, "\tDIEPDMA=0x%08x, DOEPDMA=0x%08x\n", readl(regs + DIEPDMA(index)), readl(regs + DOEPDMA(index))); seq_printf(seq, "\tDIEPINT=0x%08x, DOEPINT=0x%08x\n", readl(regs + DIEPINT(index)), readl(regs + DOEPINT(index))); seq_printf(seq, "\tDIEPTSIZ=0x%08x, DOEPTSIZ=0x%08x\n", readl(regs + DIEPTSIZ(index)), readl(regs + DOEPTSIZ(index))); seq_puts(seq, "\n"); seq_printf(seq, "mps %d\n", ep->ep.maxpacket); seq_printf(seq, "total_data=%ld\n", ep->total_data); seq_printf(seq, "request list (%p,%p):\n", ep->queue.next, ep->queue.prev); spin_lock_irqsave(&hsotg->lock, flags); list_for_each_entry(req, &ep->queue, queue) { if (--show_limit < 0) { seq_puts(seq, "not showing more requests...\n"); break; } seq_printf(seq, "%c req %p: %d bytes @%p, ", req == ep->req ? '*' : ' ', req, req->req.length, req->req.buf); seq_printf(seq, "%d done, res %d\n", req->req.actual, req->req.status); } spin_unlock_irqrestore(&hsotg->lock, flags); return 0; } static int ep_open(struct inode *inode, struct file *file) { return single_open(file, ep_show, inode->i_private); } static const struct file_operations ep_fops = { .owner = THIS_MODULE, .open = ep_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; /** * s3c_hsotg_create_debug - create debugfs directory and files * @hsotg: The driver state * * Create the debugfs files to allow the user to get information * about the state of the system. The directory name is created * with the same name as the device itself, in case we end up * with multiple blocks in future systems. */ static void s3c_hsotg_create_debug(struct dwc2_hsotg *hsotg) { struct dentry *root; unsigned epidx; root = debugfs_create_dir(dev_name(hsotg->dev), NULL); hsotg->debug_root = root; if (IS_ERR(root)) { dev_err(hsotg->dev, "cannot create debug root\n"); return; } /* create general state file */ hsotg->debug_file = debugfs_create_file("state", 0444, root, hsotg, &state_fops); if (IS_ERR(hsotg->debug_file)) dev_err(hsotg->dev, "%s: failed to create state\n", __func__); hsotg->debug_fifo = debugfs_create_file("fifo", 0444, root, hsotg, &fifo_fops); if (IS_ERR(hsotg->debug_fifo)) dev_err(hsotg->dev, "%s: failed to create fifo\n", __func__); /* Create one file for each out endpoint */ for (epidx = 0; epidx < hsotg->num_of_eps; epidx++) { struct s3c_hsotg_ep *ep; ep = hsotg->eps_out[epidx]; if (ep) { ep->debugfs = debugfs_create_file(ep->name, 0444, root, ep, &ep_fops); if (IS_ERR(ep->debugfs)) dev_err(hsotg->dev, "failed to create %s debug file\n", ep->name); } } /* Create one file for each in endpoint. EP0 is handled with out eps */ for (epidx = 1; epidx < hsotg->num_of_eps; epidx++) { struct s3c_hsotg_ep *ep; ep = hsotg->eps_in[epidx]; if (ep) { ep->debugfs = debugfs_create_file(ep->name, 0444, root, ep, &ep_fops); if (IS_ERR(ep->debugfs)) dev_err(hsotg->dev, "failed to create %s debug file\n", ep->name); } } } /** * s3c_hsotg_delete_debug - cleanup debugfs entries * @hsotg: The driver state * * Cleanup (remove) the debugfs files for use on module exit. */ static void s3c_hsotg_delete_debug(struct dwc2_hsotg *hsotg) { unsigned epidx; for (epidx = 0; epidx < hsotg->num_of_eps; epidx++) { if (hsotg->eps_in[epidx]) debugfs_remove(hsotg->eps_in[epidx]->debugfs); if (hsotg->eps_out[epidx]) debugfs_remove(hsotg->eps_out[epidx]->debugfs); } debugfs_remove(hsotg->debug_file); debugfs_remove(hsotg->debug_fifo); debugfs_remove(hsotg->debug_root); } #ifdef CONFIG_OF static void s3c_hsotg_of_probe(struct dwc2_hsotg *hsotg) { struct device_node *np = hsotg->dev->of_node; u32 len = 0; u32 i = 0; /* Enable dma if requested in device tree */ hsotg->g_using_dma = of_property_read_bool(np, "g-use-dma"); /* * Register TX periodic fifo size per endpoint. * EP0 is excluded since it has no fifo configuration. */ if (!of_find_property(np, "g-tx-fifo-size", &len)) goto rx_fifo; len /= sizeof(u32); /* Read tx fifo sizes other than ep0 */ if (of_property_read_u32_array(np, "g-tx-fifo-size", &hsotg->g_tx_fifo_sz[1], len)) goto rx_fifo; /* Add ep0 */ len++; /* Make remaining TX fifos unavailable */ if (len < MAX_EPS_CHANNELS) { for (i = len; i < MAX_EPS_CHANNELS; i++) hsotg->g_tx_fifo_sz[i] = 0; } rx_fifo: /* Register RX fifo size */ of_property_read_u32(np, "g-rx-fifo-size", &hsotg->g_rx_fifo_sz); /* Register NPTX fifo size */ of_property_read_u32(np, "g-np-tx-fifo-size", &hsotg->g_np_g_tx_fifo_sz); } #else static inline void s3c_hsotg_of_probe(struct dwc2_hsotg *hsotg) { } #endif /** * dwc2_gadget_init - init function for gadget * @dwc2: The data structure for the DWC2 driver. * @irq: The IRQ number for the controller. */ int dwc2_gadget_init(struct dwc2_hsotg *hsotg, int irq) { struct device *dev = hsotg->dev; struct s3c_hsotg_plat *plat = dev->platform_data; int epnum; int ret; int i; u32 p_tx_fifo[] = DWC2_G_P_LEGACY_TX_FIFO_SIZE; /* Set default UTMI width */ hsotg->phyif = GUSBCFG_PHYIF16; s3c_hsotg_of_probe(hsotg); /* Initialize to legacy fifo configuration values */ hsotg->g_rx_fifo_sz = 2048; hsotg->g_np_g_tx_fifo_sz = 1024; memcpy(&hsotg->g_tx_fifo_sz[1], p_tx_fifo, sizeof(p_tx_fifo)); /* Device tree specific probe */ s3c_hsotg_of_probe(hsotg); /* Dump fifo information */ dev_dbg(dev, "NonPeriodic TXFIFO size: %d\n", hsotg->g_np_g_tx_fifo_sz); dev_dbg(dev, "RXFIFO size: %d\n", hsotg->g_rx_fifo_sz); for (i = 0; i < MAX_EPS_CHANNELS; i++) dev_dbg(dev, "Periodic TXFIFO%2d size: %d\n", i, hsotg->g_tx_fifo_sz[i]); /* * If platform probe couldn't find a generic PHY or an old style * USB PHY, fall back to pdata */ if (IS_ERR_OR_NULL(hsotg->phy) && IS_ERR_OR_NULL(hsotg->uphy)) { plat = dev_get_platdata(dev); if (!plat) { dev_err(dev, "no platform data or transceiver defined\n"); return -EPROBE_DEFER; } hsotg->plat = plat; } else if (hsotg->phy) { /* * If using the generic PHY framework, check if the PHY bus * width is 8-bit and set the phyif appropriately. */ if (phy_get_bus_width(hsotg->phy) == 8) hsotg->phyif = GUSBCFG_PHYIF8; } hsotg->clk = devm_clk_get(dev, "otg"); if (IS_ERR(hsotg->clk)) { hsotg->clk = NULL; dev_dbg(dev, "cannot get otg clock\n"); } hsotg->gadget.max_speed = USB_SPEED_HIGH; hsotg->gadget.ops = &s3c_hsotg_gadget_ops; hsotg->gadget.name = dev_name(dev); /* reset the system */ ret = clk_prepare_enable(hsotg->clk); if (ret) { dev_err(dev, "failed to enable otg clk\n"); goto err_clk; } /* regulators */ for (i = 0; i < ARRAY_SIZE(hsotg->supplies); i++) hsotg->supplies[i].supply = s3c_hsotg_supply_names[i]; ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(hsotg->supplies), hsotg->supplies); if (ret) { dev_err(dev, "failed to request supplies: %d\n", ret); goto err_clk; } ret = regulator_bulk_enable(ARRAY_SIZE(hsotg->supplies), hsotg->supplies); if (ret) { dev_err(dev, "failed to enable supplies: %d\n", ret); goto err_clk; } /* usb phy enable */ s3c_hsotg_phy_enable(hsotg); s3c_hsotg_corereset(hsotg); ret = s3c_hsotg_hw_cfg(hsotg); if (ret) { dev_err(hsotg->dev, "Hardware configuration failed: %d\n", ret); goto err_clk; } s3c_hsotg_init(hsotg); hsotg->ctrl_buff = devm_kzalloc(hsotg->dev, DWC2_CTRL_BUFF_SIZE, GFP_KERNEL); if (!hsotg->ctrl_buff) { dev_err(dev, "failed to allocate ctrl request buff\n"); ret = -ENOMEM; goto err_supplies; } hsotg->ep0_buff = devm_kzalloc(hsotg->dev, DWC2_CTRL_BUFF_SIZE, GFP_KERNEL); if (!hsotg->ep0_buff) { dev_err(dev, "failed to allocate ctrl reply buff\n"); ret = -ENOMEM; goto err_supplies; } ret = devm_request_irq(hsotg->dev, irq, s3c_hsotg_irq, IRQF_SHARED, dev_name(hsotg->dev), hsotg); if (ret < 0) { s3c_hsotg_phy_disable(hsotg); clk_disable_unprepare(hsotg->clk); regulator_bulk_disable(ARRAY_SIZE(hsotg->supplies), hsotg->supplies); dev_err(dev, "cannot claim IRQ for gadget\n"); goto err_supplies; } /* hsotg->num_of_eps holds number of EPs other than ep0 */ if (hsotg->num_of_eps == 0) { dev_err(dev, "wrong number of EPs (zero)\n"); ret = -EINVAL; goto err_supplies; } /* setup endpoint information */ INIT_LIST_HEAD(&hsotg->gadget.ep_list); hsotg->gadget.ep0 = &hsotg->eps_out[0]->ep; /* allocate EP0 request */ hsotg->ctrl_req = s3c_hsotg_ep_alloc_request(&hsotg->eps_out[0]->ep, GFP_KERNEL); if (!hsotg->ctrl_req) { dev_err(dev, "failed to allocate ctrl req\n"); ret = -ENOMEM; goto err_supplies; } /* initialise the endpoints now the core has been initialised */ for (epnum = 0; epnum < hsotg->num_of_eps; epnum++) { if (hsotg->eps_in[epnum]) s3c_hsotg_initep(hsotg, hsotg->eps_in[epnum], epnum, 1); if (hsotg->eps_out[epnum]) s3c_hsotg_initep(hsotg, hsotg->eps_out[epnum], epnum, 0); } /* disable power and clock */ s3c_hsotg_phy_disable(hsotg); ret = regulator_bulk_disable(ARRAY_SIZE(hsotg->supplies), hsotg->supplies); if (ret) { dev_err(dev, "failed to disable supplies: %d\n", ret); goto err_supplies; } ret = usb_add_gadget_udc(dev, &hsotg->gadget); if (ret) goto err_supplies; s3c_hsotg_create_debug(hsotg); s3c_hsotg_dump(hsotg); return 0; err_supplies: s3c_hsotg_phy_disable(hsotg); err_clk: clk_disable_unprepare(hsotg->clk); return ret; } EXPORT_SYMBOL_GPL(dwc2_gadget_init); /** * s3c_hsotg_remove - remove function for hsotg driver * @pdev: The platform information for the driver */ int s3c_hsotg_remove(struct dwc2_hsotg *hsotg) { usb_del_gadget_udc(&hsotg->gadget); s3c_hsotg_delete_debug(hsotg); clk_disable_unprepare(hsotg->clk); return 0; } EXPORT_SYMBOL_GPL(s3c_hsotg_remove); int s3c_hsotg_suspend(struct dwc2_hsotg *hsotg) { unsigned long flags; int ret = 0; mutex_lock(&hsotg->init_mutex); if (hsotg->driver) { int ep; dev_info(hsotg->dev, "suspending usb gadget %s\n", hsotg->driver->driver.name); spin_lock_irqsave(&hsotg->lock, flags); if (hsotg->enabled) s3c_hsotg_core_disconnect(hsotg); s3c_hsotg_disconnect(hsotg); hsotg->gadget.speed = USB_SPEED_UNKNOWN; spin_unlock_irqrestore(&hsotg->lock, flags); s3c_hsotg_phy_disable(hsotg); for (ep = 0; ep < hsotg->num_of_eps; ep++) { if (hsotg->eps_in[ep]) s3c_hsotg_ep_disable(&hsotg->eps_in[ep]->ep); if (hsotg->eps_out[ep]) s3c_hsotg_ep_disable(&hsotg->eps_out[ep]->ep); } ret = regulator_bulk_disable(ARRAY_SIZE(hsotg->supplies), hsotg->supplies); clk_disable(hsotg->clk); } mutex_unlock(&hsotg->init_mutex); return ret; } EXPORT_SYMBOL_GPL(s3c_hsotg_suspend); int s3c_hsotg_resume(struct dwc2_hsotg *hsotg) { unsigned long flags; int ret = 0; mutex_lock(&hsotg->init_mutex); if (hsotg->driver) { dev_info(hsotg->dev, "resuming usb gadget %s\n", hsotg->driver->driver.name); clk_enable(hsotg->clk); ret = regulator_bulk_enable(ARRAY_SIZE(hsotg->supplies), hsotg->supplies); s3c_hsotg_phy_enable(hsotg); spin_lock_irqsave(&hsotg->lock, flags); s3c_hsotg_core_init_disconnected(hsotg); if (hsotg->enabled) s3c_hsotg_core_connect(hsotg); spin_unlock_irqrestore(&hsotg->lock, flags); } mutex_unlock(&hsotg->init_mutex); return ret; } EXPORT_SYMBOL_GPL(s3c_hsotg_resume);