// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) /* * hcd_intr.c - DesignWare HS OTG Controller host-mode interrupt handling * * Copyright (C) 2004-2013 Synopsys, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions, and the following disclaimer, * without modification. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The names of the above-listed copyright holders may not be used * to endorse or promote products derived from this software without * specific prior written permission. * * ALTERNATIVELY, this software may be distributed under the terms of the * GNU General Public License ("GPL") as published by the Free Software * Foundation; either version 2 of the License, or (at your option) any * later version. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* * This file contains the interrupt handlers for Host mode */ #include #include #include #include #include #include #include #include #include #include #include "core.h" #include "hcd.h" /* * If we get this many NAKs on a split transaction we'll slow down * retransmission. A 1 here means delay after the first NAK. */ #define DWC2_NAKS_BEFORE_DELAY 3 /* This function is for debug only */ static void dwc2_track_missed_sofs(struct dwc2_hsotg *hsotg) { u16 curr_frame_number = hsotg->frame_number; u16 expected = dwc2_frame_num_inc(hsotg->last_frame_num, 1); if (expected != curr_frame_number) dwc2_sch_vdbg(hsotg, "MISSED SOF %04x != %04x\n", expected, curr_frame_number); #ifdef CONFIG_USB_DWC2_TRACK_MISSED_SOFS if (hsotg->frame_num_idx < FRAME_NUM_ARRAY_SIZE) { if (expected != curr_frame_number) { hsotg->frame_num_array[hsotg->frame_num_idx] = curr_frame_number; hsotg->last_frame_num_array[hsotg->frame_num_idx] = hsotg->last_frame_num; hsotg->frame_num_idx++; } } else if (!hsotg->dumped_frame_num_array) { int i; dev_info(hsotg->dev, "Frame Last Frame\n"); dev_info(hsotg->dev, "----- ----------\n"); for (i = 0; i < FRAME_NUM_ARRAY_SIZE; i++) { dev_info(hsotg->dev, "0x%04x 0x%04x\n", hsotg->frame_num_array[i], hsotg->last_frame_num_array[i]); } hsotg->dumped_frame_num_array = 1; } #endif hsotg->last_frame_num = curr_frame_number; } static void dwc2_hc_handle_tt_clear(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, struct dwc2_qtd *qtd) { struct usb_device *root_hub = dwc2_hsotg_to_hcd(hsotg)->self.root_hub; struct urb *usb_urb; if (!chan->qh) return; if (chan->qh->dev_speed == USB_SPEED_HIGH) return; if (!qtd->urb) return; usb_urb = qtd->urb->priv; if (!usb_urb || !usb_urb->dev || !usb_urb->dev->tt) return; /* * The root hub doesn't really have a TT, but Linux thinks it * does because how could you have a "high speed hub" that * directly talks directly to low speed devices without a TT? * It's all lies. Lies, I tell you. */ if (usb_urb->dev->tt->hub == root_hub) return; if (qtd->urb->status != -EPIPE && qtd->urb->status != -EREMOTEIO) { chan->qh->tt_buffer_dirty = 1; if (usb_hub_clear_tt_buffer(usb_urb)) /* Clear failed; let's hope things work anyway */ chan->qh->tt_buffer_dirty = 0; } } /* * Handles the start-of-frame interrupt in host mode. Non-periodic * transactions may be queued to the DWC_otg controller for the current * (micro)frame. Periodic transactions may be queued to the controller * for the next (micro)frame. */ static void dwc2_sof_intr(struct dwc2_hsotg *hsotg) { struct list_head *qh_entry; struct dwc2_qh *qh; enum dwc2_transaction_type tr_type; /* Clear interrupt */ dwc2_writel(GINTSTS_SOF, hsotg->regs + GINTSTS); #ifdef DEBUG_SOF dev_vdbg(hsotg->dev, "--Start of Frame Interrupt--\n"); #endif hsotg->frame_number = dwc2_hcd_get_frame_number(hsotg); dwc2_track_missed_sofs(hsotg); /* Determine whether any periodic QHs should be executed */ qh_entry = hsotg->periodic_sched_inactive.next; while (qh_entry != &hsotg->periodic_sched_inactive) { qh = list_entry(qh_entry, struct dwc2_qh, qh_list_entry); qh_entry = qh_entry->next; if (dwc2_frame_num_le(qh->next_active_frame, hsotg->frame_number)) { dwc2_sch_vdbg(hsotg, "QH=%p ready fn=%04x, nxt=%04x\n", qh, hsotg->frame_number, qh->next_active_frame); /* * Move QH to the ready list to be executed next * (micro)frame */ list_move_tail(&qh->qh_list_entry, &hsotg->periodic_sched_ready); } } tr_type = dwc2_hcd_select_transactions(hsotg); if (tr_type != DWC2_TRANSACTION_NONE) dwc2_hcd_queue_transactions(hsotg, tr_type); } /* * Handles the Rx FIFO Level Interrupt, which indicates that there is * at least one packet in the Rx FIFO. The packets are moved from the FIFO to * memory if the DWC_otg controller is operating in Slave mode. */ static void dwc2_rx_fifo_level_intr(struct dwc2_hsotg *hsotg) { u32 grxsts, chnum, bcnt, dpid, pktsts; struct dwc2_host_chan *chan; if (dbg_perio()) dev_vdbg(hsotg->dev, "--RxFIFO Level Interrupt--\n"); grxsts = dwc2_readl(hsotg->regs + GRXSTSP); chnum = (grxsts & GRXSTS_HCHNUM_MASK) >> GRXSTS_HCHNUM_SHIFT; chan = hsotg->hc_ptr_array[chnum]; if (!chan) { dev_err(hsotg->dev, "Unable to get corresponding channel\n"); return; } bcnt = (grxsts & GRXSTS_BYTECNT_MASK) >> GRXSTS_BYTECNT_SHIFT; dpid = (grxsts & GRXSTS_DPID_MASK) >> GRXSTS_DPID_SHIFT; pktsts = (grxsts & GRXSTS_PKTSTS_MASK) >> GRXSTS_PKTSTS_SHIFT; /* Packet Status */ if (dbg_perio()) { dev_vdbg(hsotg->dev, " Ch num = %d\n", chnum); dev_vdbg(hsotg->dev, " Count = %d\n", bcnt); dev_vdbg(hsotg->dev, " DPID = %d, chan.dpid = %d\n", dpid, chan->data_pid_start); dev_vdbg(hsotg->dev, " PStatus = %d\n", pktsts); } switch (pktsts) { case GRXSTS_PKTSTS_HCHIN: /* Read the data into the host buffer */ if (bcnt > 0) { dwc2_read_packet(hsotg, chan->xfer_buf, bcnt); /* Update the HC fields for the next packet received */ chan->xfer_count += bcnt; chan->xfer_buf += bcnt; } break; case GRXSTS_PKTSTS_HCHIN_XFER_COMP: case GRXSTS_PKTSTS_DATATOGGLEERR: case GRXSTS_PKTSTS_HCHHALTED: /* Handled in interrupt, just ignore data */ break; default: dev_err(hsotg->dev, "RxFIFO Level Interrupt: Unknown status %d\n", pktsts); break; } } /* * This interrupt occurs when the non-periodic Tx FIFO is half-empty. More * data packets may be written to the FIFO for OUT transfers. More requests * may be written to the non-periodic request queue for IN transfers. This * interrupt is enabled only in Slave mode. */ static void dwc2_np_tx_fifo_empty_intr(struct dwc2_hsotg *hsotg) { dev_vdbg(hsotg->dev, "--Non-Periodic TxFIFO Empty Interrupt--\n"); dwc2_hcd_queue_transactions(hsotg, DWC2_TRANSACTION_NON_PERIODIC); } /* * This interrupt occurs when the periodic Tx FIFO is half-empty. More data * packets may be written to the FIFO for OUT transfers. More requests may be * written to the periodic request queue for IN transfers. This interrupt is * enabled only in Slave mode. */ static void dwc2_perio_tx_fifo_empty_intr(struct dwc2_hsotg *hsotg) { if (dbg_perio()) dev_vdbg(hsotg->dev, "--Periodic TxFIFO Empty Interrupt--\n"); dwc2_hcd_queue_transactions(hsotg, DWC2_TRANSACTION_PERIODIC); } static void dwc2_hprt0_enable(struct dwc2_hsotg *hsotg, u32 hprt0, u32 *hprt0_modify) { struct dwc2_core_params *params = &hsotg->params; int do_reset = 0; u32 usbcfg; u32 prtspd; u32 hcfg; u32 fslspclksel; u32 hfir; dev_vdbg(hsotg->dev, "%s(%p)\n", __func__, hsotg); /* Every time when port enables calculate HFIR.FrInterval */ hfir = dwc2_readl(hsotg->regs + HFIR); hfir &= ~HFIR_FRINT_MASK; hfir |= dwc2_calc_frame_interval(hsotg) << HFIR_FRINT_SHIFT & HFIR_FRINT_MASK; dwc2_writel(hfir, hsotg->regs + HFIR); /* Check if we need to adjust the PHY clock speed for low power */ if (!params->host_support_fs_ls_low_power) { /* Port has been enabled, set the reset change flag */ hsotg->flags.b.port_reset_change = 1; return; } usbcfg = dwc2_readl(hsotg->regs + GUSBCFG); prtspd = (hprt0 & HPRT0_SPD_MASK) >> HPRT0_SPD_SHIFT; if (prtspd == HPRT0_SPD_LOW_SPEED || prtspd == HPRT0_SPD_FULL_SPEED) { /* Low power */ if (!(usbcfg & GUSBCFG_PHY_LP_CLK_SEL)) { /* Set PHY low power clock select for FS/LS devices */ usbcfg |= GUSBCFG_PHY_LP_CLK_SEL; dwc2_writel(usbcfg, hsotg->regs + GUSBCFG); do_reset = 1; } hcfg = dwc2_readl(hsotg->regs + HCFG); fslspclksel = (hcfg & HCFG_FSLSPCLKSEL_MASK) >> HCFG_FSLSPCLKSEL_SHIFT; if (prtspd == HPRT0_SPD_LOW_SPEED && params->host_ls_low_power_phy_clk) { /* 6 MHZ */ dev_vdbg(hsotg->dev, "FS_PHY programming HCFG to 6 MHz\n"); if (fslspclksel != HCFG_FSLSPCLKSEL_6_MHZ) { fslspclksel = HCFG_FSLSPCLKSEL_6_MHZ; hcfg &= ~HCFG_FSLSPCLKSEL_MASK; hcfg |= fslspclksel << HCFG_FSLSPCLKSEL_SHIFT; dwc2_writel(hcfg, hsotg->regs + HCFG); do_reset = 1; } } else { /* 48 MHZ */ dev_vdbg(hsotg->dev, "FS_PHY programming HCFG to 48 MHz\n"); if (fslspclksel != HCFG_FSLSPCLKSEL_48_MHZ) { fslspclksel = HCFG_FSLSPCLKSEL_48_MHZ; hcfg &= ~HCFG_FSLSPCLKSEL_MASK; hcfg |= fslspclksel << HCFG_FSLSPCLKSEL_SHIFT; dwc2_writel(hcfg, hsotg->regs + HCFG); do_reset = 1; } } } else { /* Not low power */ if (usbcfg & GUSBCFG_PHY_LP_CLK_SEL) { usbcfg &= ~GUSBCFG_PHY_LP_CLK_SEL; dwc2_writel(usbcfg, hsotg->regs + GUSBCFG); do_reset = 1; } } if (do_reset) { *hprt0_modify |= HPRT0_RST; dwc2_writel(*hprt0_modify, hsotg->regs + HPRT0); queue_delayed_work(hsotg->wq_otg, &hsotg->reset_work, msecs_to_jiffies(60)); } else { /* Port has been enabled, set the reset change flag */ hsotg->flags.b.port_reset_change = 1; } } /* * There are multiple conditions that can cause a port interrupt. This function * determines which interrupt conditions have occurred and handles them * appropriately. */ static void dwc2_port_intr(struct dwc2_hsotg *hsotg) { u32 hprt0; u32 hprt0_modify; dev_vdbg(hsotg->dev, "--Port Interrupt--\n"); hprt0 = dwc2_readl(hsotg->regs + HPRT0); hprt0_modify = hprt0; /* * Clear appropriate bits in HPRT0 to clear the interrupt bit in * GINTSTS */ hprt0_modify &= ~(HPRT0_ENA | HPRT0_CONNDET | HPRT0_ENACHG | HPRT0_OVRCURRCHG); /* * Port Connect Detected * Set flag and clear if detected */ if (hprt0 & HPRT0_CONNDET) { dwc2_writel(hprt0_modify | HPRT0_CONNDET, hsotg->regs + HPRT0); dev_vdbg(hsotg->dev, "--Port Interrupt HPRT0=0x%08x Port Connect Detected--\n", hprt0); dwc2_hcd_connect(hsotg); /* * The Hub driver asserts a reset when it sees port connect * status change flag */ } /* * Port Enable Changed * Clear if detected - Set internal flag if disabled */ if (hprt0 & HPRT0_ENACHG) { dwc2_writel(hprt0_modify | HPRT0_ENACHG, hsotg->regs + HPRT0); dev_vdbg(hsotg->dev, " --Port Interrupt HPRT0=0x%08x Port Enable Changed (now %d)--\n", hprt0, !!(hprt0 & HPRT0_ENA)); if (hprt0 & HPRT0_ENA) { hsotg->new_connection = true; dwc2_hprt0_enable(hsotg, hprt0, &hprt0_modify); } else { hsotg->flags.b.port_enable_change = 1; if (hsotg->params.dma_desc_fs_enable) { u32 hcfg; hsotg->params.dma_desc_enable = false; hsotg->new_connection = false; hcfg = dwc2_readl(hsotg->regs + HCFG); hcfg &= ~HCFG_DESCDMA; dwc2_writel(hcfg, hsotg->regs + HCFG); } } } /* Overcurrent Change Interrupt */ if (hprt0 & HPRT0_OVRCURRCHG) { dwc2_writel(hprt0_modify | HPRT0_OVRCURRCHG, hsotg->regs + HPRT0); dev_vdbg(hsotg->dev, " --Port Interrupt HPRT0=0x%08x Port Overcurrent Changed--\n", hprt0); hsotg->flags.b.port_over_current_change = 1; } } /* * Gets the actual length of a transfer after the transfer halts. halt_status * holds the reason for the halt. * * For IN transfers where halt_status is DWC2_HC_XFER_COMPLETE, *short_read * is set to 1 upon return if less than the requested number of bytes were * transferred. short_read may also be NULL on entry, in which case it remains * unchanged. */ static u32 dwc2_get_actual_xfer_length(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, int chnum, struct dwc2_qtd *qtd, enum dwc2_halt_status halt_status, int *short_read) { u32 hctsiz, count, length; hctsiz = dwc2_readl(hsotg->regs + HCTSIZ(chnum)); if (halt_status == DWC2_HC_XFER_COMPLETE) { if (chan->ep_is_in) { count = (hctsiz & TSIZ_XFERSIZE_MASK) >> TSIZ_XFERSIZE_SHIFT; length = chan->xfer_len - count; if (short_read) *short_read = (count != 0); } else if (chan->qh->do_split) { length = qtd->ssplit_out_xfer_count; } else { length = chan->xfer_len; } } else { /* * Must use the hctsiz.pktcnt field to determine how much data * has been transferred. This field reflects the number of * packets that have been transferred via the USB. This is * always an integral number of packets if the transfer was * halted before its normal completion. (Can't use the * hctsiz.xfersize field because that reflects the number of * bytes transferred via the AHB, not the USB). */ count = (hctsiz & TSIZ_PKTCNT_MASK) >> TSIZ_PKTCNT_SHIFT; length = (chan->start_pkt_count - count) * chan->max_packet; } return length; } /** * dwc2_update_urb_state() - Updates the state of the URB after a Transfer * Complete interrupt on the host channel. Updates the actual_length field * of the URB based on the number of bytes transferred via the host channel. * Sets the URB status if the data transfer is finished. * * @hsotg: Programming view of the DWC_otg controller * @chan: Programming view of host channel * @chnum: Channel number * @urb: Processing URB * @qtd: Queue transfer descriptor * * Return: 1 if the data transfer specified by the URB is completely finished, * 0 otherwise */ static int dwc2_update_urb_state(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, int chnum, struct dwc2_hcd_urb *urb, struct dwc2_qtd *qtd) { u32 hctsiz; int xfer_done = 0; int short_read = 0; int xfer_length = dwc2_get_actual_xfer_length(hsotg, chan, chnum, qtd, DWC2_HC_XFER_COMPLETE, &short_read); if (urb->actual_length + xfer_length > urb->length) { dev_warn(hsotg->dev, "%s(): trimming xfer length\n", __func__); xfer_length = urb->length - urb->actual_length; } dev_vdbg(hsotg->dev, "urb->actual_length=%d xfer_length=%d\n", urb->actual_length, xfer_length); urb->actual_length += xfer_length; if (xfer_length && chan->ep_type == USB_ENDPOINT_XFER_BULK && (urb->flags & URB_SEND_ZERO_PACKET) && urb->actual_length >= urb->length && !(urb->length % chan->max_packet)) { xfer_done = 0; } else if (short_read || urb->actual_length >= urb->length) { xfer_done = 1; urb->status = 0; } hctsiz = dwc2_readl(hsotg->regs + HCTSIZ(chnum)); dev_vdbg(hsotg->dev, "DWC_otg: %s: %s, channel %d\n", __func__, (chan->ep_is_in ? "IN" : "OUT"), chnum); dev_vdbg(hsotg->dev, " chan->xfer_len %d\n", chan->xfer_len); dev_vdbg(hsotg->dev, " hctsiz.xfersize %d\n", (hctsiz & TSIZ_XFERSIZE_MASK) >> TSIZ_XFERSIZE_SHIFT); dev_vdbg(hsotg->dev, " urb->transfer_buffer_length %d\n", urb->length); dev_vdbg(hsotg->dev, " urb->actual_length %d\n", urb->actual_length); dev_vdbg(hsotg->dev, " short_read %d, xfer_done %d\n", short_read, xfer_done); return xfer_done; } /* * Save the starting data toggle for the next transfer. The data toggle is * saved in the QH for non-control transfers and it's saved in the QTD for * control transfers. */ void dwc2_hcd_save_data_toggle(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, int chnum, struct dwc2_qtd *qtd) { u32 hctsiz = dwc2_readl(hsotg->regs + HCTSIZ(chnum)); u32 pid = (hctsiz & TSIZ_SC_MC_PID_MASK) >> TSIZ_SC_MC_PID_SHIFT; if (chan->ep_type != USB_ENDPOINT_XFER_CONTROL) { if (WARN(!chan || !chan->qh, "chan->qh must be specified for non-control eps\n")) return; if (pid == TSIZ_SC_MC_PID_DATA0) chan->qh->data_toggle = DWC2_HC_PID_DATA0; else chan->qh->data_toggle = DWC2_HC_PID_DATA1; } else { if (WARN(!qtd, "qtd must be specified for control eps\n")) return; if (pid == TSIZ_SC_MC_PID_DATA0) qtd->data_toggle = DWC2_HC_PID_DATA0; else qtd->data_toggle = DWC2_HC_PID_DATA1; } } /** * dwc2_update_isoc_urb_state() - Updates the state of an Isochronous URB when * the transfer is stopped for any reason. The fields of the current entry in * the frame descriptor array are set based on the transfer state and the input * halt_status. Completes the Isochronous URB if all the URB frames have been * completed. * * @hsotg: Programming view of the DWC_otg controller * @chan: Programming view of host channel * @chnum: Channel number * @halt_status: Reason for halting a host channel * @qtd: Queue transfer descriptor * * Return: DWC2_HC_XFER_COMPLETE if there are more frames remaining to be * transferred in the URB. Otherwise return DWC2_HC_XFER_URB_COMPLETE. */ static enum dwc2_halt_status dwc2_update_isoc_urb_state( struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, int chnum, struct dwc2_qtd *qtd, enum dwc2_halt_status halt_status) { struct dwc2_hcd_iso_packet_desc *frame_desc; struct dwc2_hcd_urb *urb = qtd->urb; if (!urb) return DWC2_HC_XFER_NO_HALT_STATUS; frame_desc = &urb->iso_descs[qtd->isoc_frame_index]; switch (halt_status) { case DWC2_HC_XFER_COMPLETE: frame_desc->status = 0; frame_desc->actual_length = dwc2_get_actual_xfer_length(hsotg, chan, chnum, qtd, halt_status, NULL); break; case DWC2_HC_XFER_FRAME_OVERRUN: urb->error_count++; if (chan->ep_is_in) frame_desc->status = -ENOSR; else frame_desc->status = -ECOMM; frame_desc->actual_length = 0; break; case DWC2_HC_XFER_BABBLE_ERR: urb->error_count++; frame_desc->status = -EOVERFLOW; /* Don't need to update actual_length in this case */ break; case DWC2_HC_XFER_XACT_ERR: urb->error_count++; frame_desc->status = -EPROTO; frame_desc->actual_length = dwc2_get_actual_xfer_length(hsotg, chan, chnum, qtd, halt_status, NULL); /* Skip whole frame */ if (chan->qh->do_split && chan->ep_type == USB_ENDPOINT_XFER_ISOC && chan->ep_is_in && hsotg->params.host_dma) { qtd->complete_split = 0; qtd->isoc_split_offset = 0; } break; default: dev_err(hsotg->dev, "Unhandled halt_status (%d)\n", halt_status); break; } if (++qtd->isoc_frame_index == urb->packet_count) { /* * urb->status is not used for isoc transfers. The individual * frame_desc statuses are used instead. */ dwc2_host_complete(hsotg, qtd, 0); halt_status = DWC2_HC_XFER_URB_COMPLETE; } else { halt_status = DWC2_HC_XFER_COMPLETE; } return halt_status; } /* * Frees the first QTD in the QH's list if free_qtd is 1. For non-periodic * QHs, removes the QH from the active non-periodic schedule. If any QTDs are * still linked to the QH, the QH is added to the end of the inactive * non-periodic schedule. For periodic QHs, removes the QH from the periodic * schedule if no more QTDs are linked to the QH. */ static void dwc2_deactivate_qh(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh, int free_qtd) { int continue_split = 0; struct dwc2_qtd *qtd; if (dbg_qh(qh)) dev_vdbg(hsotg->dev, " %s(%p,%p,%d)\n", __func__, hsotg, qh, free_qtd); if (list_empty(&qh->qtd_list)) { dev_dbg(hsotg->dev, "## QTD list empty ##\n"); goto no_qtd; } qtd = list_first_entry(&qh->qtd_list, struct dwc2_qtd, qtd_list_entry); if (qtd->complete_split) continue_split = 1; else if (qtd->isoc_split_pos == DWC2_HCSPLT_XACTPOS_MID || qtd->isoc_split_pos == DWC2_HCSPLT_XACTPOS_END) continue_split = 1; if (free_qtd) { dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh); continue_split = 0; } no_qtd: qh->channel = NULL; dwc2_hcd_qh_deactivate(hsotg, qh, continue_split); } /** * dwc2_release_channel() - Releases a host channel for use by other transfers * * @hsotg: The HCD state structure * @chan: The host channel to release * @qtd: The QTD associated with the host channel. This QTD may be * freed if the transfer is complete or an error has occurred. * @halt_status: Reason the channel is being released. This status * determines the actions taken by this function. * * Also attempts to select and queue more transactions since at least one host * channel is available. */ static void dwc2_release_channel(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, struct dwc2_qtd *qtd, enum dwc2_halt_status halt_status) { enum dwc2_transaction_type tr_type; u32 haintmsk; int free_qtd = 0; if (dbg_hc(chan)) dev_vdbg(hsotg->dev, " %s: channel %d, halt_status %d\n", __func__, chan->hc_num, halt_status); switch (halt_status) { case DWC2_HC_XFER_URB_COMPLETE: free_qtd = 1; break; case DWC2_HC_XFER_AHB_ERR: case DWC2_HC_XFER_STALL: case DWC2_HC_XFER_BABBLE_ERR: free_qtd = 1; break; case DWC2_HC_XFER_XACT_ERR: if (qtd && qtd->error_count >= 3) { dev_vdbg(hsotg->dev, " Complete URB with transaction error\n"); free_qtd = 1; dwc2_host_complete(hsotg, qtd, -EPROTO); } break; case DWC2_HC_XFER_URB_DEQUEUE: /* * The QTD has already been removed and the QH has been * deactivated. Don't want to do anything except release the * host channel and try to queue more transfers. */ goto cleanup; case DWC2_HC_XFER_PERIODIC_INCOMPLETE: dev_vdbg(hsotg->dev, " Complete URB with I/O error\n"); free_qtd = 1; dwc2_host_complete(hsotg, qtd, -EIO); break; case DWC2_HC_XFER_NO_HALT_STATUS: default: break; } dwc2_deactivate_qh(hsotg, chan->qh, free_qtd); cleanup: /* * Release the host channel for use by other transfers. The cleanup * function clears the channel interrupt enables and conditions, so * there's no need to clear the Channel Halted interrupt separately. */ if (!list_empty(&chan->hc_list_entry)) list_del(&chan->hc_list_entry); dwc2_hc_cleanup(hsotg, chan); list_add_tail(&chan->hc_list_entry, &hsotg->free_hc_list); if (hsotg->params.uframe_sched) { hsotg->available_host_channels++; } else { switch (chan->ep_type) { case USB_ENDPOINT_XFER_CONTROL: case USB_ENDPOINT_XFER_BULK: hsotg->non_periodic_channels--; break; default: /* * Don't release reservations for periodic channels * here. That's done when a periodic transfer is * descheduled (i.e. when the QH is removed from the * periodic schedule). */ break; } } haintmsk = dwc2_readl(hsotg->regs + HAINTMSK); haintmsk &= ~(1 << chan->hc_num); dwc2_writel(haintmsk, hsotg->regs + HAINTMSK); /* Try to queue more transfers now that there's a free channel */ tr_type = dwc2_hcd_select_transactions(hsotg); if (tr_type != DWC2_TRANSACTION_NONE) dwc2_hcd_queue_transactions(hsotg, tr_type); } /* * Halts a host channel. If the channel cannot be halted immediately because * the request queue is full, this function ensures that the FIFO empty * interrupt for the appropriate queue is enabled so that the halt request can * be queued when there is space in the request queue. * * This function may also be called in DMA mode. In that case, the channel is * simply released since the core always halts the channel automatically in * DMA mode. */ static void dwc2_halt_channel(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, struct dwc2_qtd *qtd, enum dwc2_halt_status halt_status) { if (dbg_hc(chan)) dev_vdbg(hsotg->dev, "%s()\n", __func__); if (hsotg->params.host_dma) { if (dbg_hc(chan)) dev_vdbg(hsotg->dev, "DMA enabled\n"); dwc2_release_channel(hsotg, chan, qtd, halt_status); return; } /* Slave mode processing */ dwc2_hc_halt(hsotg, chan, halt_status); if (chan->halt_on_queue) { u32 gintmsk; dev_vdbg(hsotg->dev, "Halt on queue\n"); if (chan->ep_type == USB_ENDPOINT_XFER_CONTROL || chan->ep_type == USB_ENDPOINT_XFER_BULK) { dev_vdbg(hsotg->dev, "control/bulk\n"); /* * Make sure the Non-periodic Tx FIFO empty interrupt * is enabled so that the non-periodic schedule will * be processed */ gintmsk = dwc2_readl(hsotg->regs + GINTMSK); gintmsk |= GINTSTS_NPTXFEMP; dwc2_writel(gintmsk, hsotg->regs + GINTMSK); } else { dev_vdbg(hsotg->dev, "isoc/intr\n"); /* * Move the QH from the periodic queued schedule to * the periodic assigned schedule. This allows the * halt to be queued when the periodic schedule is * processed. */ list_move_tail(&chan->qh->qh_list_entry, &hsotg->periodic_sched_assigned); /* * Make sure the Periodic Tx FIFO Empty interrupt is * enabled so that the periodic schedule will be * processed */ gintmsk = dwc2_readl(hsotg->regs + GINTMSK); gintmsk |= GINTSTS_PTXFEMP; dwc2_writel(gintmsk, hsotg->regs + GINTMSK); } } } /* * Performs common cleanup for non-periodic transfers after a Transfer * Complete interrupt. This function should be called after any endpoint type * specific handling is finished to release the host channel. */ static void dwc2_complete_non_periodic_xfer(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, int chnum, struct dwc2_qtd *qtd, enum dwc2_halt_status halt_status) { dev_vdbg(hsotg->dev, "%s()\n", __func__); qtd->error_count = 0; if (chan->hcint & HCINTMSK_NYET) { /* * Got a NYET on the last transaction of the transfer. This * means that the endpoint should be in the PING state at the * beginning of the next transfer. */ dev_vdbg(hsotg->dev, "got NYET\n"); chan->qh->ping_state = 1; } /* * Always halt and release the host channel to make it available for * more transfers. There may still be more phases for a control * transfer or more data packets for a bulk transfer at this point, * but the host channel is still halted. A channel will be reassigned * to the transfer when the non-periodic schedule is processed after * the channel is released. This allows transactions to be queued * properly via dwc2_hcd_queue_transactions, which also enables the * Tx FIFO Empty interrupt if necessary. */ if (chan->ep_is_in) { /* * IN transfers in Slave mode require an explicit disable to * halt the channel. (In DMA mode, this call simply releases * the channel.) */ dwc2_halt_channel(hsotg, chan, qtd, halt_status); } else { /* * The channel is automatically disabled by the core for OUT * transfers in Slave mode */ dwc2_release_channel(hsotg, chan, qtd, halt_status); } } /* * Performs common cleanup for periodic transfers after a Transfer Complete * interrupt. This function should be called after any endpoint type specific * handling is finished to release the host channel. */ static void dwc2_complete_periodic_xfer(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, int chnum, struct dwc2_qtd *qtd, enum dwc2_halt_status halt_status) { u32 hctsiz = dwc2_readl(hsotg->regs + HCTSIZ(chnum)); qtd->error_count = 0; if (!chan->ep_is_in || (hctsiz & TSIZ_PKTCNT_MASK) == 0) /* Core halts channel in these cases */ dwc2_release_channel(hsotg, chan, qtd, halt_status); else /* Flush any outstanding requests from the Tx queue */ dwc2_halt_channel(hsotg, chan, qtd, halt_status); } static int dwc2_xfercomp_isoc_split_in(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, int chnum, struct dwc2_qtd *qtd) { struct dwc2_hcd_iso_packet_desc *frame_desc; u32 len; u32 hctsiz; u32 pid; if (!qtd->urb) return 0; frame_desc = &qtd->urb->iso_descs[qtd->isoc_frame_index]; len = dwc2_get_actual_xfer_length(hsotg, chan, chnum, qtd, DWC2_HC_XFER_COMPLETE, NULL); if (!len && !qtd->isoc_split_offset) { qtd->complete_split = 0; return 0; } frame_desc->actual_length += len; if (chan->align_buf) { dev_vdbg(hsotg->dev, "non-aligned buffer\n"); dma_unmap_single(hsotg->dev, chan->qh->dw_align_buf_dma, DWC2_KMEM_UNALIGNED_BUF_SIZE, DMA_FROM_DEVICE); memcpy(qtd->urb->buf + (chan->xfer_dma - qtd->urb->dma), chan->qh->dw_align_buf, len); } qtd->isoc_split_offset += len; hctsiz = dwc2_readl(hsotg->regs + HCTSIZ(chnum)); pid = (hctsiz & TSIZ_SC_MC_PID_MASK) >> TSIZ_SC_MC_PID_SHIFT; if (frame_desc->actual_length >= frame_desc->length || pid == 0) { frame_desc->status = 0; qtd->isoc_frame_index++; qtd->complete_split = 0; qtd->isoc_split_offset = 0; } if (qtd->isoc_frame_index == qtd->urb->packet_count) { dwc2_host_complete(hsotg, qtd, 0); dwc2_release_channel(hsotg, chan, qtd, DWC2_HC_XFER_URB_COMPLETE); } else { dwc2_release_channel(hsotg, chan, qtd, DWC2_HC_XFER_NO_HALT_STATUS); } return 1; /* Indicates that channel released */ } /* * Handles a host channel Transfer Complete interrupt. This handler may be * called in either DMA mode or Slave mode. */ static void dwc2_hc_xfercomp_intr(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, int chnum, struct dwc2_qtd *qtd) { struct dwc2_hcd_urb *urb = qtd->urb; enum dwc2_halt_status halt_status = DWC2_HC_XFER_COMPLETE; int pipe_type; int urb_xfer_done; if (dbg_hc(chan)) dev_vdbg(hsotg->dev, "--Host Channel %d Interrupt: Transfer Complete--\n", chnum); if (!urb) goto handle_xfercomp_done; pipe_type = dwc2_hcd_get_pipe_type(&urb->pipe_info); if (hsotg->params.dma_desc_enable) { dwc2_hcd_complete_xfer_ddma(hsotg, chan, chnum, halt_status); if (pipe_type == USB_ENDPOINT_XFER_ISOC) /* Do not disable the interrupt, just clear it */ return; goto handle_xfercomp_done; } /* Handle xfer complete on CSPLIT */ if (chan->qh->do_split) { if (chan->ep_type == USB_ENDPOINT_XFER_ISOC && chan->ep_is_in && hsotg->params.host_dma) { if (qtd->complete_split && dwc2_xfercomp_isoc_split_in(hsotg, chan, chnum, qtd)) goto handle_xfercomp_done; } else { qtd->complete_split = 0; } } /* Update the QTD and URB states */ switch (pipe_type) { case USB_ENDPOINT_XFER_CONTROL: switch (qtd->control_phase) { case DWC2_CONTROL_SETUP: if (urb->length > 0) qtd->control_phase = DWC2_CONTROL_DATA; else qtd->control_phase = DWC2_CONTROL_STATUS; dev_vdbg(hsotg->dev, " Control setup transaction done\n"); halt_status = DWC2_HC_XFER_COMPLETE; break; case DWC2_CONTROL_DATA: urb_xfer_done = dwc2_update_urb_state(hsotg, chan, chnum, urb, qtd); if (urb_xfer_done) { qtd->control_phase = DWC2_CONTROL_STATUS; dev_vdbg(hsotg->dev, " Control data transfer done\n"); } else { dwc2_hcd_save_data_toggle(hsotg, chan, chnum, qtd); } halt_status = DWC2_HC_XFER_COMPLETE; break; case DWC2_CONTROL_STATUS: dev_vdbg(hsotg->dev, " Control transfer complete\n"); if (urb->status == -EINPROGRESS) urb->status = 0; dwc2_host_complete(hsotg, qtd, urb->status); halt_status = DWC2_HC_XFER_URB_COMPLETE; break; } dwc2_complete_non_periodic_xfer(hsotg, chan, chnum, qtd, halt_status); break; case USB_ENDPOINT_XFER_BULK: dev_vdbg(hsotg->dev, " Bulk transfer complete\n"); urb_xfer_done = dwc2_update_urb_state(hsotg, chan, chnum, urb, qtd); if (urb_xfer_done) { dwc2_host_complete(hsotg, qtd, urb->status); halt_status = DWC2_HC_XFER_URB_COMPLETE; } else { halt_status = DWC2_HC_XFER_COMPLETE; } dwc2_hcd_save_data_toggle(hsotg, chan, chnum, qtd); dwc2_complete_non_periodic_xfer(hsotg, chan, chnum, qtd, halt_status); break; case USB_ENDPOINT_XFER_INT: dev_vdbg(hsotg->dev, " Interrupt transfer complete\n"); urb_xfer_done = dwc2_update_urb_state(hsotg, chan, chnum, urb, qtd); /* * Interrupt URB is done on the first transfer complete * interrupt */ if (urb_xfer_done) { dwc2_host_complete(hsotg, qtd, urb->status); halt_status = DWC2_HC_XFER_URB_COMPLETE; } else { halt_status = DWC2_HC_XFER_COMPLETE; } dwc2_hcd_save_data_toggle(hsotg, chan, chnum, qtd); dwc2_complete_periodic_xfer(hsotg, chan, chnum, qtd, halt_status); break; case USB_ENDPOINT_XFER_ISOC: if (dbg_perio()) dev_vdbg(hsotg->dev, " Isochronous transfer complete\n"); if (qtd->isoc_split_pos == DWC2_HCSPLT_XACTPOS_ALL) halt_status = dwc2_update_isoc_urb_state(hsotg, chan, chnum, qtd, DWC2_HC_XFER_COMPLETE); dwc2_complete_periodic_xfer(hsotg, chan, chnum, qtd, halt_status); break; } handle_xfercomp_done: disable_hc_int(hsotg, chnum, HCINTMSK_XFERCOMPL); } /* * Handles a host channel STALL interrupt. This handler may be called in * either DMA mode or Slave mode. */ static void dwc2_hc_stall_intr(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, int chnum, struct dwc2_qtd *qtd) { struct dwc2_hcd_urb *urb = qtd->urb; int pipe_type; dev_dbg(hsotg->dev, "--Host Channel %d Interrupt: STALL Received--\n", chnum); if (hsotg->params.dma_desc_enable) { dwc2_hcd_complete_xfer_ddma(hsotg, chan, chnum, DWC2_HC_XFER_STALL); goto handle_stall_done; } if (!urb) goto handle_stall_halt; pipe_type = dwc2_hcd_get_pipe_type(&urb->pipe_info); if (pipe_type == USB_ENDPOINT_XFER_CONTROL) dwc2_host_complete(hsotg, qtd, -EPIPE); if (pipe_type == USB_ENDPOINT_XFER_BULK || pipe_type == USB_ENDPOINT_XFER_INT) { dwc2_host_complete(hsotg, qtd, -EPIPE); /* * USB protocol requires resetting the data toggle for bulk * and interrupt endpoints when a CLEAR_FEATURE(ENDPOINT_HALT) * setup command is issued to the endpoint. Anticipate the * CLEAR_FEATURE command since a STALL has occurred and reset * the data toggle now. */ chan->qh->data_toggle = 0; } handle_stall_halt: dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_STALL); handle_stall_done: disable_hc_int(hsotg, chnum, HCINTMSK_STALL); } /* * Updates the state of the URB when a transfer has been stopped due to an * abnormal condition before the transfer completes. Modifies the * actual_length field of the URB to reflect the number of bytes that have * actually been transferred via the host channel. */ static void dwc2_update_urb_state_abn(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, int chnum, struct dwc2_hcd_urb *urb, struct dwc2_qtd *qtd, enum dwc2_halt_status halt_status) { u32 xfer_length = dwc2_get_actual_xfer_length(hsotg, chan, chnum, qtd, halt_status, NULL); u32 hctsiz; if (urb->actual_length + xfer_length > urb->length) { dev_warn(hsotg->dev, "%s(): trimming xfer length\n", __func__); xfer_length = urb->length - urb->actual_length; } urb->actual_length += xfer_length; hctsiz = dwc2_readl(hsotg->regs + HCTSIZ(chnum)); dev_vdbg(hsotg->dev, "DWC_otg: %s: %s, channel %d\n", __func__, (chan->ep_is_in ? "IN" : "OUT"), chnum); dev_vdbg(hsotg->dev, " chan->start_pkt_count %d\n", chan->start_pkt_count); dev_vdbg(hsotg->dev, " hctsiz.pktcnt %d\n", (hctsiz & TSIZ_PKTCNT_MASK) >> TSIZ_PKTCNT_SHIFT); dev_vdbg(hsotg->dev, " chan->max_packet %d\n", chan->max_packet); dev_vdbg(hsotg->dev, " bytes_transferred %d\n", xfer_length); dev_vdbg(hsotg->dev, " urb->actual_length %d\n", urb->actual_length); dev_vdbg(hsotg->dev, " urb->transfer_buffer_length %d\n", urb->length); } /* * Handles a host channel NAK interrupt. This handler may be called in either * DMA mode or Slave mode. */ static void dwc2_hc_nak_intr(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, int chnum, struct dwc2_qtd *qtd) { if (!qtd) { dev_dbg(hsotg->dev, "%s: qtd is NULL\n", __func__); return; } if (!qtd->urb) { dev_dbg(hsotg->dev, "%s: qtd->urb is NULL\n", __func__); return; } if (dbg_hc(chan)) dev_vdbg(hsotg->dev, "--Host Channel %d Interrupt: NAK Received--\n", chnum); /* * Handle NAK for IN/OUT SSPLIT/CSPLIT transfers, bulk, control, and * interrupt. Re-start the SSPLIT transfer. * * Normally for non-periodic transfers we'll retry right away, but to * avoid interrupt storms we'll wait before retrying if we've got * several NAKs. If we didn't do this we'd retry directly from the * interrupt handler and could end up quickly getting another * interrupt (another NAK), which we'd retry. Note that we do not * delay retries for IN parts of control requests, as those are expected * to complete fairly quickly, and if we delay them we risk confusing * the device and cause it issue STALL. * * Note that in DMA mode software only gets involved to re-send NAKed * transfers for split transactions, so we only need to apply this * delaying logic when handling splits. In non-DMA mode presumably we * might want a similar delay if someone can demonstrate this problem * affects that code path too. */ if (chan->do_split) { if (chan->complete_split) qtd->error_count = 0; qtd->complete_split = 0; qtd->num_naks++; qtd->qh->want_wait = qtd->num_naks >= DWC2_NAKS_BEFORE_DELAY && !(chan->ep_type == USB_ENDPOINT_XFER_CONTROL && chan->ep_is_in); dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_NAK); goto handle_nak_done; } switch (dwc2_hcd_get_pipe_type(&qtd->urb->pipe_info)) { case USB_ENDPOINT_XFER_CONTROL: case USB_ENDPOINT_XFER_BULK: if (hsotg->params.host_dma && chan->ep_is_in) { /* * NAK interrupts are enabled on bulk/control IN * transfers in DMA mode for the sole purpose of * resetting the error count after a transaction error * occurs. The core will continue transferring data. */ qtd->error_count = 0; break; } /* * NAK interrupts normally occur during OUT transfers in DMA * or Slave mode. For IN transfers, more requests will be * queued as request queue space is available. */ qtd->error_count = 0; if (!chan->qh->ping_state) { dwc2_update_urb_state_abn(hsotg, chan, chnum, qtd->urb, qtd, DWC2_HC_XFER_NAK); dwc2_hcd_save_data_toggle(hsotg, chan, chnum, qtd); if (chan->speed == USB_SPEED_HIGH) chan->qh->ping_state = 1; } /* * Halt the channel so the transfer can be re-started from * the appropriate point or the PING protocol will * start/continue */ dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_NAK); break; case USB_ENDPOINT_XFER_INT: qtd->error_count = 0; dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_NAK); break; case USB_ENDPOINT_XFER_ISOC: /* Should never get called for isochronous transfers */ dev_err(hsotg->dev, "NACK interrupt for ISOC transfer\n"); break; } handle_nak_done: disable_hc_int(hsotg, chnum, HCINTMSK_NAK); } /* * Handles a host channel ACK interrupt. This interrupt is enabled when * performing the PING protocol in Slave mode, when errors occur during * either Slave mode or DMA mode, and during Start Split transactions. */ static void dwc2_hc_ack_intr(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, int chnum, struct dwc2_qtd *qtd) { struct dwc2_hcd_iso_packet_desc *frame_desc; if (dbg_hc(chan)) dev_vdbg(hsotg->dev, "--Host Channel %d Interrupt: ACK Received--\n", chnum); if (chan->do_split) { /* Handle ACK on SSPLIT. ACK should not occur in CSPLIT. */ if (!chan->ep_is_in && chan->data_pid_start != DWC2_HC_PID_SETUP) qtd->ssplit_out_xfer_count = chan->xfer_len; if (chan->ep_type != USB_ENDPOINT_XFER_ISOC || chan->ep_is_in) { qtd->complete_split = 1; dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_ACK); } else { /* ISOC OUT */ switch (chan->xact_pos) { case DWC2_HCSPLT_XACTPOS_ALL: break; case DWC2_HCSPLT_XACTPOS_END: qtd->isoc_split_pos = DWC2_HCSPLT_XACTPOS_ALL; qtd->isoc_split_offset = 0; break; case DWC2_HCSPLT_XACTPOS_BEGIN: case DWC2_HCSPLT_XACTPOS_MID: /* * For BEGIN or MID, calculate the length for * the next microframe to determine the correct * SSPLIT token, either MID or END */ frame_desc = &qtd->urb->iso_descs[ qtd->isoc_frame_index]; qtd->isoc_split_offset += 188; if (frame_desc->length - qtd->isoc_split_offset <= 188) qtd->isoc_split_pos = DWC2_HCSPLT_XACTPOS_END; else qtd->isoc_split_pos = DWC2_HCSPLT_XACTPOS_MID; break; } } } else { qtd->error_count = 0; if (chan->qh->ping_state) { chan->qh->ping_state = 0; /* * Halt the channel so the transfer can be re-started * from the appropriate point. This only happens in * Slave mode. In DMA mode, the ping_state is cleared * when the transfer is started because the core * automatically executes the PING, then the transfer. */ dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_ACK); } } /* * If the ACK occurred when _not_ in the PING state, let the channel * continue transferring data after clearing the error count */ disable_hc_int(hsotg, chnum, HCINTMSK_ACK); } /* * Handles a host channel NYET interrupt. This interrupt should only occur on * Bulk and Control OUT endpoints and for complete split transactions. If a * NYET occurs at the same time as a Transfer Complete interrupt, it is * handled in the xfercomp interrupt handler, not here. This handler may be * called in either DMA mode or Slave mode. */ static void dwc2_hc_nyet_intr(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, int chnum, struct dwc2_qtd *qtd) { if (dbg_hc(chan)) dev_vdbg(hsotg->dev, "--Host Channel %d Interrupt: NYET Received--\n", chnum); /* * NYET on CSPLIT * re-do the CSPLIT immediately on non-periodic */ if (chan->do_split && chan->complete_split) { if (chan->ep_is_in && chan->ep_type == USB_ENDPOINT_XFER_ISOC && hsotg->params.host_dma) { qtd->complete_split = 0; qtd->isoc_split_offset = 0; qtd->isoc_frame_index++; if (qtd->urb && qtd->isoc_frame_index == qtd->urb->packet_count) { dwc2_host_complete(hsotg, qtd, 0); dwc2_release_channel(hsotg, chan, qtd, DWC2_HC_XFER_URB_COMPLETE); } else { dwc2_release_channel(hsotg, chan, qtd, DWC2_HC_XFER_NO_HALT_STATUS); } goto handle_nyet_done; } if (chan->ep_type == USB_ENDPOINT_XFER_INT || chan->ep_type == USB_ENDPOINT_XFER_ISOC) { struct dwc2_qh *qh = chan->qh; bool past_end; if (!hsotg->params.uframe_sched) { int frnum = dwc2_hcd_get_frame_number(hsotg); /* Don't have num_hs_transfers; simple logic */ past_end = dwc2_full_frame_num(frnum) != dwc2_full_frame_num(qh->next_active_frame); } else { int end_frnum; /* * Figure out the end frame based on * schedule. * * We don't want to go on trying again * and again forever. Let's stop when * we've done all the transfers that * were scheduled. * * We're going to be comparing * start_active_frame and * next_active_frame, both of which * are 1 before the time the packet * goes on the wire, so that cancels * out. Basically if had 1 transfer * and we saw 1 NYET then we're done. * We're getting a NYET here so if * next >= (start + num_transfers) * we're done. The complexity is that * for all but ISOC_OUT we skip one * slot. */ end_frnum = dwc2_frame_num_inc( qh->start_active_frame, qh->num_hs_transfers); if (qh->ep_type != USB_ENDPOINT_XFER_ISOC || qh->ep_is_in) end_frnum = dwc2_frame_num_inc(end_frnum, 1); past_end = dwc2_frame_num_le( end_frnum, qh->next_active_frame); } if (past_end) { /* Treat this as a transaction error. */ #if 0 /* * Todo: Fix system performance so this can * be treated as an error. Right now complete * splits cannot be scheduled precisely enough * due to other system activity, so this error * occurs regularly in Slave mode. */ qtd->error_count++; #endif qtd->complete_split = 0; dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_XACT_ERR); /* Todo: add support for isoc release */ goto handle_nyet_done; } } dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_NYET); goto handle_nyet_done; } chan->qh->ping_state = 1; qtd->error_count = 0; dwc2_update_urb_state_abn(hsotg, chan, chnum, qtd->urb, qtd, DWC2_HC_XFER_NYET); dwc2_hcd_save_data_toggle(hsotg, chan, chnum, qtd); /* * Halt the channel and re-start the transfer so the PING protocol * will start */ dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_NYET); handle_nyet_done: disable_hc_int(hsotg, chnum, HCINTMSK_NYET); } /* * Handles a host channel babble interrupt. This handler may be called in * either DMA mode or Slave mode. */ static void dwc2_hc_babble_intr(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, int chnum, struct dwc2_qtd *qtd) { dev_dbg(hsotg->dev, "--Host Channel %d Interrupt: Babble Error--\n", chnum); dwc2_hc_handle_tt_clear(hsotg, chan, qtd); if (hsotg->params.dma_desc_enable) { dwc2_hcd_complete_xfer_ddma(hsotg, chan, chnum, DWC2_HC_XFER_BABBLE_ERR); goto disable_int; } if (chan->ep_type != USB_ENDPOINT_XFER_ISOC) { dwc2_host_complete(hsotg, qtd, -EOVERFLOW); dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_BABBLE_ERR); } else { enum dwc2_halt_status halt_status; halt_status = dwc2_update_isoc_urb_state(hsotg, chan, chnum, qtd, DWC2_HC_XFER_BABBLE_ERR); dwc2_halt_channel(hsotg, chan, qtd, halt_status); } disable_int: disable_hc_int(hsotg, chnum, HCINTMSK_BBLERR); } /* * Handles a host channel AHB error interrupt. This handler is only called in * DMA mode. */ static void dwc2_hc_ahberr_intr(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, int chnum, struct dwc2_qtd *qtd) { struct dwc2_hcd_urb *urb = qtd->urb; char *pipetype, *speed; u32 hcchar; u32 hcsplt; u32 hctsiz; u32 hc_dma; dev_dbg(hsotg->dev, "--Host Channel %d Interrupt: AHB Error--\n", chnum); if (!urb) goto handle_ahberr_halt; dwc2_hc_handle_tt_clear(hsotg, chan, qtd); hcchar = dwc2_readl(hsotg->regs + HCCHAR(chnum)); hcsplt = dwc2_readl(hsotg->regs + HCSPLT(chnum)); hctsiz = dwc2_readl(hsotg->regs + HCTSIZ(chnum)); hc_dma = dwc2_readl(hsotg->regs + HCDMA(chnum)); dev_err(hsotg->dev, "AHB ERROR, Channel %d\n", chnum); dev_err(hsotg->dev, " hcchar 0x%08x, hcsplt 0x%08x\n", hcchar, hcsplt); dev_err(hsotg->dev, " hctsiz 0x%08x, hc_dma 0x%08x\n", hctsiz, hc_dma); dev_err(hsotg->dev, " Device address: %d\n", dwc2_hcd_get_dev_addr(&urb->pipe_info)); dev_err(hsotg->dev, " Endpoint: %d, %s\n", dwc2_hcd_get_ep_num(&urb->pipe_info), dwc2_hcd_is_pipe_in(&urb->pipe_info) ? "IN" : "OUT"); switch (dwc2_hcd_get_pipe_type(&urb->pipe_info)) { case USB_ENDPOINT_XFER_CONTROL: pipetype = "CONTROL"; break; case USB_ENDPOINT_XFER_BULK: pipetype = "BULK"; break; case USB_ENDPOINT_XFER_INT: pipetype = "INTERRUPT"; break; case USB_ENDPOINT_XFER_ISOC: pipetype = "ISOCHRONOUS"; break; default: pipetype = "UNKNOWN"; break; } dev_err(hsotg->dev, " Endpoint type: %s\n", pipetype); switch (chan->speed) { case USB_SPEED_HIGH: speed = "HIGH"; break; case USB_SPEED_FULL: speed = "FULL"; break; case USB_SPEED_LOW: speed = "LOW"; break; default: speed = "UNKNOWN"; break; } dev_err(hsotg->dev, " Speed: %s\n", speed); dev_err(hsotg->dev, " Max packet size: %d\n", dwc2_hcd_get_mps(&urb->pipe_info)); dev_err(hsotg->dev, " Data buffer length: %d\n", urb->length); dev_err(hsotg->dev, " Transfer buffer: %p, Transfer DMA: %08lx\n", urb->buf, (unsigned long)urb->dma); dev_err(hsotg->dev, " Setup buffer: %p, Setup DMA: %08lx\n", urb->setup_packet, (unsigned long)urb->setup_dma); dev_err(hsotg->dev, " Interval: %d\n", urb->interval); /* Core halts the channel for Descriptor DMA mode */ if (hsotg->params.dma_desc_enable) { dwc2_hcd_complete_xfer_ddma(hsotg, chan, chnum, DWC2_HC_XFER_AHB_ERR); goto handle_ahberr_done; } dwc2_host_complete(hsotg, qtd, -EIO); handle_ahberr_halt: /* * Force a channel halt. Don't call dwc2_halt_channel because that won't * write to the HCCHARn register in DMA mode to force the halt. */ dwc2_hc_halt(hsotg, chan, DWC2_HC_XFER_AHB_ERR); handle_ahberr_done: disable_hc_int(hsotg, chnum, HCINTMSK_AHBERR); } /* * Handles a host channel transaction error interrupt. This handler may be * called in either DMA mode or Slave mode. */ static void dwc2_hc_xacterr_intr(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, int chnum, struct dwc2_qtd *qtd) { dev_dbg(hsotg->dev, "--Host Channel %d Interrupt: Transaction Error--\n", chnum); dwc2_hc_handle_tt_clear(hsotg, chan, qtd); if (hsotg->params.dma_desc_enable) { dwc2_hcd_complete_xfer_ddma(hsotg, chan, chnum, DWC2_HC_XFER_XACT_ERR); goto handle_xacterr_done; } switch (dwc2_hcd_get_pipe_type(&qtd->urb->pipe_info)) { case USB_ENDPOINT_XFER_CONTROL: case USB_ENDPOINT_XFER_BULK: qtd->error_count++; if (!chan->qh->ping_state) { dwc2_update_urb_state_abn(hsotg, chan, chnum, qtd->urb, qtd, DWC2_HC_XFER_XACT_ERR); dwc2_hcd_save_data_toggle(hsotg, chan, chnum, qtd); if (!chan->ep_is_in && chan->speed == USB_SPEED_HIGH) chan->qh->ping_state = 1; } /* * Halt the channel so the transfer can be re-started from * the appropriate point or the PING protocol will start */ dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_XACT_ERR); break; case USB_ENDPOINT_XFER_INT: qtd->error_count++; if (chan->do_split && chan->complete_split) qtd->complete_split = 0; dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_XACT_ERR); break; case USB_ENDPOINT_XFER_ISOC: { enum dwc2_halt_status halt_status; halt_status = dwc2_update_isoc_urb_state(hsotg, chan, chnum, qtd, DWC2_HC_XFER_XACT_ERR); dwc2_halt_channel(hsotg, chan, qtd, halt_status); } break; } handle_xacterr_done: disable_hc_int(hsotg, chnum, HCINTMSK_XACTERR); } /* * Handles a host channel frame overrun interrupt. This handler may be called * in either DMA mode or Slave mode. */ static void dwc2_hc_frmovrun_intr(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, int chnum, struct dwc2_qtd *qtd) { enum dwc2_halt_status halt_status; if (dbg_hc(chan)) dev_dbg(hsotg->dev, "--Host Channel %d Interrupt: Frame Overrun--\n", chnum); dwc2_hc_handle_tt_clear(hsotg, chan, qtd); switch (dwc2_hcd_get_pipe_type(&qtd->urb->pipe_info)) { case USB_ENDPOINT_XFER_CONTROL: case USB_ENDPOINT_XFER_BULK: break; case USB_ENDPOINT_XFER_INT: dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_FRAME_OVERRUN); break; case USB_ENDPOINT_XFER_ISOC: halt_status = dwc2_update_isoc_urb_state(hsotg, chan, chnum, qtd, DWC2_HC_XFER_FRAME_OVERRUN); dwc2_halt_channel(hsotg, chan, qtd, halt_status); break; } disable_hc_int(hsotg, chnum, HCINTMSK_FRMOVRUN); } /* * Handles a host channel data toggle error interrupt. This handler may be * called in either DMA mode or Slave mode. */ static void dwc2_hc_datatglerr_intr(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, int chnum, struct dwc2_qtd *qtd) { dev_dbg(hsotg->dev, "--Host Channel %d Interrupt: Data Toggle Error--\n", chnum); if (chan->ep_is_in) qtd->error_count = 0; else dev_err(hsotg->dev, "Data Toggle Error on OUT transfer, channel %d\n", chnum); dwc2_hc_handle_tt_clear(hsotg, chan, qtd); disable_hc_int(hsotg, chnum, HCINTMSK_DATATGLERR); } /* * For debug only. It checks that a valid halt status is set and that * HCCHARn.chdis is clear. If there's a problem, corrective action is * taken and a warning is issued. * * Return: true if halt status is ok, false otherwise */ static bool dwc2_halt_status_ok(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, int chnum, struct dwc2_qtd *qtd) { #ifdef DEBUG u32 hcchar; u32 hctsiz; u32 hcintmsk; u32 hcsplt; if (chan->halt_status == DWC2_HC_XFER_NO_HALT_STATUS) { /* * This code is here only as a check. This condition should * never happen. Ignore the halt if it does occur. */ hcchar = dwc2_readl(hsotg->regs + HCCHAR(chnum)); hctsiz = dwc2_readl(hsotg->regs + HCTSIZ(chnum)); hcintmsk = dwc2_readl(hsotg->regs + HCINTMSK(chnum)); hcsplt = dwc2_readl(hsotg->regs + HCSPLT(chnum)); dev_dbg(hsotg->dev, "%s: chan->halt_status DWC2_HC_XFER_NO_HALT_STATUS,\n", __func__); dev_dbg(hsotg->dev, "channel %d, hcchar 0x%08x, hctsiz 0x%08x,\n", chnum, hcchar, hctsiz); dev_dbg(hsotg->dev, "hcint 0x%08x, hcintmsk 0x%08x, hcsplt 0x%08x,\n", chan->hcint, hcintmsk, hcsplt); if (qtd) dev_dbg(hsotg->dev, "qtd->complete_split %d\n", qtd->complete_split); dev_warn(hsotg->dev, "%s: no halt status, channel %d, ignoring interrupt\n", __func__, chnum); return false; } /* * This code is here only as a check. hcchar.chdis should never be set * when the halt interrupt occurs. Halt the channel again if it does * occur. */ hcchar = dwc2_readl(hsotg->regs + HCCHAR(chnum)); if (hcchar & HCCHAR_CHDIS) { dev_warn(hsotg->dev, "%s: hcchar.chdis set unexpectedly, hcchar 0x%08x, trying to halt again\n", __func__, hcchar); chan->halt_pending = 0; dwc2_halt_channel(hsotg, chan, qtd, chan->halt_status); return false; } #endif return true; } /* * Handles a host Channel Halted interrupt in DMA mode. This handler * determines the reason the channel halted and proceeds accordingly. */ static void dwc2_hc_chhltd_intr_dma(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, int chnum, struct dwc2_qtd *qtd) { u32 hcintmsk; int out_nak_enh = 0; if (dbg_hc(chan)) dev_vdbg(hsotg->dev, "--Host Channel %d Interrupt: DMA Channel Halted--\n", chnum); /* * For core with OUT NAK enhancement, the flow for high-speed * CONTROL/BULK OUT is handled a little differently */ if (hsotg->hw_params.snpsid >= DWC2_CORE_REV_2_71a) { if (chan->speed == USB_SPEED_HIGH && !chan->ep_is_in && (chan->ep_type == USB_ENDPOINT_XFER_CONTROL || chan->ep_type == USB_ENDPOINT_XFER_BULK)) { out_nak_enh = 1; } } if (chan->halt_status == DWC2_HC_XFER_URB_DEQUEUE || (chan->halt_status == DWC2_HC_XFER_AHB_ERR && !hsotg->params.dma_desc_enable)) { if (hsotg->params.dma_desc_enable) dwc2_hcd_complete_xfer_ddma(hsotg, chan, chnum, chan->halt_status); else /* * Just release the channel. A dequeue can happen on a * transfer timeout. In the case of an AHB Error, the * channel was forced to halt because there's no way to * gracefully recover. */ dwc2_release_channel(hsotg, chan, qtd, chan->halt_status); return; } hcintmsk = dwc2_readl(hsotg->regs + HCINTMSK(chnum)); if (chan->hcint & HCINTMSK_XFERCOMPL) { /* * Todo: This is here because of a possible hardware bug. Spec * says that on SPLIT-ISOC OUT transfers in DMA mode that a HALT * interrupt w/ACK bit set should occur, but I only see the * XFERCOMP bit, even with it masked out. This is a workaround * for that behavior. Should fix this when hardware is fixed. */ if (chan->ep_type == USB_ENDPOINT_XFER_ISOC && !chan->ep_is_in) dwc2_hc_ack_intr(hsotg, chan, chnum, qtd); dwc2_hc_xfercomp_intr(hsotg, chan, chnum, qtd); } else if (chan->hcint & HCINTMSK_STALL) { dwc2_hc_stall_intr(hsotg, chan, chnum, qtd); } else if ((chan->hcint & HCINTMSK_XACTERR) && !hsotg->params.dma_desc_enable) { if (out_nak_enh) { if (chan->hcint & (HCINTMSK_NYET | HCINTMSK_NAK | HCINTMSK_ACK)) { dev_vdbg(hsotg->dev, "XactErr with NYET/NAK/ACK\n"); qtd->error_count = 0; } else { dev_vdbg(hsotg->dev, "XactErr without NYET/NAK/ACK\n"); } } /* * Must handle xacterr before nak or ack. Could get a xacterr * at the same time as either of these on a BULK/CONTROL OUT * that started with a PING. The xacterr takes precedence. */ dwc2_hc_xacterr_intr(hsotg, chan, chnum, qtd); } else if ((chan->hcint & HCINTMSK_XCS_XACT) && hsotg->params.dma_desc_enable) { dwc2_hc_xacterr_intr(hsotg, chan, chnum, qtd); } else if ((chan->hcint & HCINTMSK_AHBERR) && hsotg->params.dma_desc_enable) { dwc2_hc_ahberr_intr(hsotg, chan, chnum, qtd); } else if (chan->hcint & HCINTMSK_BBLERR) { dwc2_hc_babble_intr(hsotg, chan, chnum, qtd); } else if (chan->hcint & HCINTMSK_FRMOVRUN) { dwc2_hc_frmovrun_intr(hsotg, chan, chnum, qtd); } else if (!out_nak_enh) { if (chan->hcint & HCINTMSK_NYET) { /* * Must handle nyet before nak or ack. Could get a nyet * at the same time as either of those on a BULK/CONTROL * OUT that started with a PING. The nyet takes * precedence. */ dwc2_hc_nyet_intr(hsotg, chan, chnum, qtd); } else if ((chan->hcint & HCINTMSK_NAK) && !(hcintmsk & HCINTMSK_NAK)) { /* * If nak is not masked, it's because a non-split IN * transfer is in an error state. In that case, the nak * is handled by the nak interrupt handler, not here. * Handle nak here for BULK/CONTROL OUT transfers, which * halt on a NAK to allow rewinding the buffer pointer. */ dwc2_hc_nak_intr(hsotg, chan, chnum, qtd); } else if ((chan->hcint & HCINTMSK_ACK) && !(hcintmsk & HCINTMSK_ACK)) { /* * If ack is not masked, it's because a non-split IN * transfer is in an error state. In that case, the ack * is handled by the ack interrupt handler, not here. * Handle ack here for split transfers. Start splits * halt on ACK. */ dwc2_hc_ack_intr(hsotg, chan, chnum, qtd); } else { if (chan->ep_type == USB_ENDPOINT_XFER_INT || chan->ep_type == USB_ENDPOINT_XFER_ISOC) { /* * A periodic transfer halted with no other * channel interrupts set. Assume it was halted * by the core because it could not be completed * in its scheduled (micro)frame. */ dev_dbg(hsotg->dev, "%s: Halt channel %d (assume incomplete periodic transfer)\n", __func__, chnum); dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_PERIODIC_INCOMPLETE); } else { dev_err(hsotg->dev, "%s: Channel %d - ChHltd set, but reason is unknown\n", __func__, chnum); dev_err(hsotg->dev, "hcint 0x%08x, intsts 0x%08x\n", chan->hcint, dwc2_readl(hsotg->regs + GINTSTS)); goto error; } } } else { dev_info(hsotg->dev, "NYET/NAK/ACK/other in non-error case, 0x%08x\n", chan->hcint); error: /* Failthrough: use 3-strikes rule */ qtd->error_count++; dwc2_update_urb_state_abn(hsotg, chan, chnum, qtd->urb, qtd, DWC2_HC_XFER_XACT_ERR); dwc2_hcd_save_data_toggle(hsotg, chan, chnum, qtd); dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_XACT_ERR); } } /* * Handles a host channel Channel Halted interrupt * * In slave mode, this handler is called only when the driver specifically * requests a halt. This occurs during handling other host channel interrupts * (e.g. nak, xacterr, stall, nyet, etc.). * * In DMA mode, this is the interrupt that occurs when the core has finished * processing a transfer on a channel. Other host channel interrupts (except * ahberr) are disabled in DMA mode. */ static void dwc2_hc_chhltd_intr(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, int chnum, struct dwc2_qtd *qtd) { if (dbg_hc(chan)) dev_vdbg(hsotg->dev, "--Host Channel %d Interrupt: Channel Halted--\n", chnum); if (hsotg->params.host_dma) { dwc2_hc_chhltd_intr_dma(hsotg, chan, chnum, qtd); } else { if (!dwc2_halt_status_ok(hsotg, chan, chnum, qtd)) return; dwc2_release_channel(hsotg, chan, qtd, chan->halt_status); } } /* * Check if the given qtd is still the top of the list (and thus valid). * * If dwc2_hcd_qtd_unlink_and_free() has been called since we grabbed * the qtd from the top of the list, this will return false (otherwise true). */ static bool dwc2_check_qtd_still_ok(struct dwc2_qtd *qtd, struct dwc2_qh *qh) { struct dwc2_qtd *cur_head; if (!qh) return false; cur_head = list_first_entry(&qh->qtd_list, struct dwc2_qtd, qtd_list_entry); return (cur_head == qtd); } /* Handles interrupt for a specific Host Channel */ static void dwc2_hc_n_intr(struct dwc2_hsotg *hsotg, int chnum) { struct dwc2_qtd *qtd; struct dwc2_host_chan *chan; u32 hcint, hcintmsk; chan = hsotg->hc_ptr_array[chnum]; hcint = dwc2_readl(hsotg->regs + HCINT(chnum)); hcintmsk = dwc2_readl(hsotg->regs + HCINTMSK(chnum)); if (!chan) { dev_err(hsotg->dev, "## hc_ptr_array for channel is NULL ##\n"); dwc2_writel(hcint, hsotg->regs + HCINT(chnum)); return; } if (dbg_hc(chan)) { dev_vdbg(hsotg->dev, "--Host Channel Interrupt--, Channel %d\n", chnum); dev_vdbg(hsotg->dev, " hcint 0x%08x, hcintmsk 0x%08x, hcint&hcintmsk 0x%08x\n", hcint, hcintmsk, hcint & hcintmsk); } dwc2_writel(hcint, hsotg->regs + HCINT(chnum)); /* * If we got an interrupt after someone called * dwc2_hcd_endpoint_disable() we don't want to crash below */ if (!chan->qh) { dev_warn(hsotg->dev, "Interrupt on disabled channel\n"); return; } chan->hcint = hcint; hcint &= hcintmsk; /* * If the channel was halted due to a dequeue, the qtd list might * be empty or at least the first entry will not be the active qtd. * In this case, take a shortcut and just release the channel. */ if (chan->halt_status == DWC2_HC_XFER_URB_DEQUEUE) { /* * If the channel was halted, this should be the only * interrupt unmasked */ WARN_ON(hcint != HCINTMSK_CHHLTD); if (hsotg->params.dma_desc_enable) dwc2_hcd_complete_xfer_ddma(hsotg, chan, chnum, chan->halt_status); else dwc2_release_channel(hsotg, chan, NULL, chan->halt_status); return; } if (list_empty(&chan->qh->qtd_list)) { /* * TODO: Will this ever happen with the * DWC2_HC_XFER_URB_DEQUEUE handling above? */ dev_dbg(hsotg->dev, "## no QTD queued for channel %d ##\n", chnum); dev_dbg(hsotg->dev, " hcint 0x%08x, hcintmsk 0x%08x, hcint&hcintmsk 0x%08x\n", chan->hcint, hcintmsk, hcint); chan->halt_status = DWC2_HC_XFER_NO_HALT_STATUS; disable_hc_int(hsotg, chnum, HCINTMSK_CHHLTD); chan->hcint = 0; return; } qtd = list_first_entry(&chan->qh->qtd_list, struct dwc2_qtd, qtd_list_entry); if (!hsotg->params.host_dma) { if ((hcint & HCINTMSK_CHHLTD) && hcint != HCINTMSK_CHHLTD) hcint &= ~HCINTMSK_CHHLTD; } if (hcint & HCINTMSK_XFERCOMPL) { dwc2_hc_xfercomp_intr(hsotg, chan, chnum, qtd); /* * If NYET occurred at same time as Xfer Complete, the NYET is * handled by the Xfer Complete interrupt handler. Don't want * to call the NYET interrupt handler in this case. */ hcint &= ~HCINTMSK_NYET; } if (hcint & HCINTMSK_CHHLTD) { dwc2_hc_chhltd_intr(hsotg, chan, chnum, qtd); if (!dwc2_check_qtd_still_ok(qtd, chan->qh)) goto exit; } if (hcint & HCINTMSK_AHBERR) { dwc2_hc_ahberr_intr(hsotg, chan, chnum, qtd); if (!dwc2_check_qtd_still_ok(qtd, chan->qh)) goto exit; } if (hcint & HCINTMSK_STALL) { dwc2_hc_stall_intr(hsotg, chan, chnum, qtd); if (!dwc2_check_qtd_still_ok(qtd, chan->qh)) goto exit; } if (hcint & HCINTMSK_NAK) { dwc2_hc_nak_intr(hsotg, chan, chnum, qtd); if (!dwc2_check_qtd_still_ok(qtd, chan->qh)) goto exit; } if (hcint & HCINTMSK_ACK) { dwc2_hc_ack_intr(hsotg, chan, chnum, qtd); if (!dwc2_check_qtd_still_ok(qtd, chan->qh)) goto exit; } if (hcint & HCINTMSK_NYET) { dwc2_hc_nyet_intr(hsotg, chan, chnum, qtd); if (!dwc2_check_qtd_still_ok(qtd, chan->qh)) goto exit; } if (hcint & HCINTMSK_XACTERR) { dwc2_hc_xacterr_intr(hsotg, chan, chnum, qtd); if (!dwc2_check_qtd_still_ok(qtd, chan->qh)) goto exit; } if (hcint & HCINTMSK_BBLERR) { dwc2_hc_babble_intr(hsotg, chan, chnum, qtd); if (!dwc2_check_qtd_still_ok(qtd, chan->qh)) goto exit; } if (hcint & HCINTMSK_FRMOVRUN) { dwc2_hc_frmovrun_intr(hsotg, chan, chnum, qtd); if (!dwc2_check_qtd_still_ok(qtd, chan->qh)) goto exit; } if (hcint & HCINTMSK_DATATGLERR) { dwc2_hc_datatglerr_intr(hsotg, chan, chnum, qtd); if (!dwc2_check_qtd_still_ok(qtd, chan->qh)) goto exit; } exit: chan->hcint = 0; } /* * This interrupt indicates that one or more host channels has a pending * interrupt. There are multiple conditions that can cause each host channel * interrupt. This function determines which conditions have occurred for each * host channel interrupt and handles them appropriately. */ static void dwc2_hc_intr(struct dwc2_hsotg *hsotg) { u32 haint; int i; struct dwc2_host_chan *chan, *chan_tmp; haint = dwc2_readl(hsotg->regs + HAINT); if (dbg_perio()) { dev_vdbg(hsotg->dev, "%s()\n", __func__); dev_vdbg(hsotg->dev, "HAINT=%08x\n", haint); } /* * According to USB 2.0 spec section 11.18.8, a host must * issue complete-split transactions in a microframe for a * set of full-/low-speed endpoints in the same relative * order as the start-splits were issued in a microframe for. */ list_for_each_entry_safe(chan, chan_tmp, &hsotg->split_order, split_order_list_entry) { int hc_num = chan->hc_num; if (haint & (1 << hc_num)) { dwc2_hc_n_intr(hsotg, hc_num); haint &= ~(1 << hc_num); } } for (i = 0; i < hsotg->params.host_channels; i++) { if (haint & (1 << i)) dwc2_hc_n_intr(hsotg, i); } } /* This function handles interrupts for the HCD */ irqreturn_t dwc2_handle_hcd_intr(struct dwc2_hsotg *hsotg) { u32 gintsts, dbg_gintsts; irqreturn_t retval = IRQ_NONE; if (!dwc2_is_controller_alive(hsotg)) { dev_warn(hsotg->dev, "Controller is dead\n"); return retval; } spin_lock(&hsotg->lock); /* Check if HOST Mode */ if (dwc2_is_host_mode(hsotg)) { gintsts = dwc2_read_core_intr(hsotg); if (!gintsts) { spin_unlock(&hsotg->lock); return retval; } retval = IRQ_HANDLED; dbg_gintsts = gintsts; #ifndef DEBUG_SOF dbg_gintsts &= ~GINTSTS_SOF; #endif if (!dbg_perio()) dbg_gintsts &= ~(GINTSTS_HCHINT | GINTSTS_RXFLVL | GINTSTS_PTXFEMP); /* Only print if there are any non-suppressed interrupts left */ if (dbg_gintsts) dev_vdbg(hsotg->dev, "DWC OTG HCD Interrupt Detected gintsts&gintmsk=0x%08x\n", gintsts); if (gintsts & GINTSTS_SOF) dwc2_sof_intr(hsotg); if (gintsts & GINTSTS_RXFLVL) dwc2_rx_fifo_level_intr(hsotg); if (gintsts & GINTSTS_NPTXFEMP) dwc2_np_tx_fifo_empty_intr(hsotg); if (gintsts & GINTSTS_PRTINT) dwc2_port_intr(hsotg); if (gintsts & GINTSTS_HCHINT) dwc2_hc_intr(hsotg); if (gintsts & GINTSTS_PTXFEMP) dwc2_perio_tx_fifo_empty_intr(hsotg); if (dbg_gintsts) { dev_vdbg(hsotg->dev, "DWC OTG HCD Finished Servicing Interrupts\n"); dev_vdbg(hsotg->dev, "DWC OTG HCD gintsts=0x%08x gintmsk=0x%08x\n", dwc2_readl(hsotg->regs + GINTSTS), dwc2_readl(hsotg->regs + GINTMSK)); } } spin_unlock(&hsotg->lock); return retval; }