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Diffstat (limited to '')
| -rw-r--r-- | drivers/usb/dwc2/hcd_intr.c | 2294 |
1 files changed, 2294 insertions, 0 deletions
diff --git a/drivers/usb/dwc2/hcd_intr.c b/drivers/usb/dwc2/hcd_intr.c new file mode 100644 index 000000000..08e2792cb --- /dev/null +++ b/drivers/usb/dwc2/hcd_intr.c @@ -0,0 +1,2294 @@ +// 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 <linux/kernel.h> +#include <linux/module.h> +#include <linux/spinlock.h> +#include <linux/interrupt.h> +#include <linux/dma-mapping.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/usb.h> + +#include <linux/usb/hcd.h> +#include <linux/usb/ch11.h> + +#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(hsotg, GINTSTS_SOF, 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, 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, HFIR); + hfir &= ~HFIR_FRINT_MASK; + hfir |= dwc2_calc_frame_interval(hsotg) << HFIR_FRINT_SHIFT & + HFIR_FRINT_MASK; + dwc2_writel(hsotg, hfir, 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, 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(hsotg, usbcfg, GUSBCFG); + do_reset = 1; + } + + hcfg = dwc2_readl(hsotg, 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(hsotg, hcfg, 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(hsotg, hcfg, HCFG); + do_reset = 1; + } + } + } else { + /* Not low power */ + if (usbcfg & GUSBCFG_PHY_LP_CLK_SEL) { + usbcfg &= ~GUSBCFG_PHY_LP_CLK_SEL; + dwc2_writel(hsotg, usbcfg, GUSBCFG); + do_reset = 1; + } + } + + if (do_reset) { + *hprt0_modify |= HPRT0_RST; + dwc2_writel(hsotg, *hprt0_modify, 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, 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(hsotg, hprt0_modify | HPRT0_CONNDET, 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(hsotg, hprt0_modify | HPRT0_ENACHG, 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, HCFG); + hcfg &= ~HCFG_DESCDMA; + dwc2_writel(hsotg, hcfg, HCFG); + } + } + } + + /* Overcurrent Change Interrupt */ + if (hprt0 & HPRT0_OVRCURRCHG) { + dwc2_writel(hsotg, hprt0_modify | HPRT0_OVRCURRCHG, + 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, 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_dbg(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, 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, 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, HAINTMSK); + haintmsk &= ~(1 << chan->hc_num); + dwc2_writel(hsotg, haintmsk, 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, GINTMSK); + gintmsk |= GINTSTS_NPTXFEMP; + dwc2_writel(hsotg, gintmsk, 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, GINTMSK); + gintmsk |= GINTSTS_PTXFEMP; + dwc2_writel(hsotg, gintmsk, 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, 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, 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, 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, HCCHAR(chnum)); + hcsplt = dwc2_readl(hsotg, HCSPLT(chnum)); + hctsiz = dwc2_readl(hsotg, HCTSIZ(chnum)); + hc_dma = dwc2_readl(hsotg, 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 (mult %d)\n", + dwc2_hcd_get_maxp(&urb->pipe_info), + dwc2_hcd_get_maxp_mult(&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, HCCHAR(chnum)); + hctsiz = dwc2_readl(hsotg, HCTSIZ(chnum)); + hcintmsk = dwc2_readl(hsotg, HCINTMSK(chnum)); + hcsplt = dwc2_readl(hsotg, 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, 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, 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, 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); + /* + * We can get here after a completed transaction + * (urb->actual_length >= urb->length) which was not reported + * as completed. If that is the case, and we do not abort + * the transfer, a transfer of size 0 will be enqueued + * subsequently. If urb->actual_length is not DMA-aligned, + * the buffer will then point to an unaligned address, and + * the resulting behavior is undefined. Bail out in that + * situation. + */ + if (qtd->urb->actual_length >= qtd->urb->length) + qtd->error_count = 3; + 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, hcintraw, hcintmsk; + + chan = hsotg->hc_ptr_array[chnum]; + + hcintraw = dwc2_readl(hsotg, HCINT(chnum)); + hcintmsk = dwc2_readl(hsotg, HCINTMSK(chnum)); + hcint = hcintraw & hcintmsk; + dwc2_writel(hsotg, hcint, HCINT(chnum)); + + if (!chan) { + dev_err(hsotg->dev, "## hc_ptr_array for channel is NULL ##\n"); + 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", + hcintraw, hcintmsk, hcint); + } + + /* + * 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 = hcintraw; + + /* + * 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, 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, GINTSTS), + dwc2_readl(hsotg, GINTMSK)); + } + } + + spin_unlock(&hsotg->lock); + + return retval; +} |