1/*
   2 * hcd_intr.c - DesignWare HS OTG Controller host-mode interrupt handling
   3 *
   4 * Copyright (C) 2004-2013 Synopsys, Inc.
   5 *
   6 * Redistribution and use in source and binary forms, with or without
   7 * modification, are permitted provided that the following conditions
   8 * are met:
   9 * 1. Redistributions of source code must retain the above copyright
  10 *    notice, this list of conditions, and the following disclaimer,
  11 *    without modification.
  12 * 2. Redistributions in binary form must reproduce the above copyright
  13 *    notice, this list of conditions and the following disclaimer in the
  14 *    documentation and/or other materials provided with the distribution.
  15 * 3. The names of the above-listed copyright holders may not be used
  16 *    to endorse or promote products derived from this software without
  17 *    specific prior written permission.
  18 *
  19 * ALTERNATIVELY, this software may be distributed under the terms of the
  20 * GNU General Public License ("GPL") as published by the Free Software
  21 * Foundation; either version 2 of the License, or (at your option) any
  22 * later version.
  23 *
  24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  25 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  26 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  27 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  28 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  29 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  30 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  31 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35 */
  36
  37/*
  38 * This file contains the interrupt handlers for Host mode
  39 */
  40#include <linux/kernel.h>
  41#include <linux/module.h>
  42#include <linux/spinlock.h>
  43#include <linux/interrupt.h>
  44#include <linux/dma-mapping.h>
  45#include <linux/io.h>
  46#include <linux/slab.h>
  47#include <linux/usb.h>
  48
  49#include <linux/usb/hcd.h>
  50#include <linux/usb/ch11.h>
  51
  52#include "core.h"
  53#include "hcd.h"
  54
 
 
 
 
 
 
  55/* This function is for debug only */
  56static void dwc2_track_missed_sofs(struct dwc2_hsotg *hsotg)
  57{
  58	u16 curr_frame_number = hsotg->frame_number;
  59	u16 expected = dwc2_frame_num_inc(hsotg->last_frame_num, 1);
  60
  61	if (expected != curr_frame_number)
  62		dwc2_sch_vdbg(hsotg, "MISSED SOF %04x != %04x\n",
  63			expected, curr_frame_number);
  64
  65#ifdef CONFIG_USB_DWC2_TRACK_MISSED_SOFS
  66	if (hsotg->frame_num_idx < FRAME_NUM_ARRAY_SIZE) {
  67		if (expected != curr_frame_number) {
  68			hsotg->frame_num_array[hsotg->frame_num_idx] =
  69					curr_frame_number;
  70			hsotg->last_frame_num_array[hsotg->frame_num_idx] =
  71					hsotg->last_frame_num;
  72			hsotg->frame_num_idx++;
  73		}
  74	} else if (!hsotg->dumped_frame_num_array) {
  75		int i;
  76
  77		dev_info(hsotg->dev, "Frame     Last Frame\n");
  78		dev_info(hsotg->dev, "-----     ----------\n");
  79		for (i = 0; i < FRAME_NUM_ARRAY_SIZE; i++) {
  80			dev_info(hsotg->dev, "0x%04x    0x%04x\n",
  81				 hsotg->frame_num_array[i],
  82				 hsotg->last_frame_num_array[i]);
  83		}
  84		hsotg->dumped_frame_num_array = 1;
  85	}
  86#endif
  87	hsotg->last_frame_num = curr_frame_number;
  88}
  89
  90static void dwc2_hc_handle_tt_clear(struct dwc2_hsotg *hsotg,
  91				    struct dwc2_host_chan *chan,
  92				    struct dwc2_qtd *qtd)
  93{
  94	struct usb_device *root_hub = dwc2_hsotg_to_hcd(hsotg)->self.root_hub;
  95	struct urb *usb_urb;
  96
  97	if (!chan->qh)
  98		return;
  99
 100	if (chan->qh->dev_speed == USB_SPEED_HIGH)
 101		return;
 102
 103	if (!qtd->urb)
 104		return;
 105
 106	usb_urb = qtd->urb->priv;
 107	if (!usb_urb || !usb_urb->dev || !usb_urb->dev->tt)
 108		return;
 109
 110	/*
 111	 * The root hub doesn't really have a TT, but Linux thinks it
 112	 * does because how could you have a "high speed hub" that
 113	 * directly talks directly to low speed devices without a TT?
 114	 * It's all lies.  Lies, I tell you.
 115	 */
 116	if (usb_urb->dev->tt->hub == root_hub)
 117		return;
 118
 119	if (qtd->urb->status != -EPIPE && qtd->urb->status != -EREMOTEIO) {
 120		chan->qh->tt_buffer_dirty = 1;
 121		if (usb_hub_clear_tt_buffer(usb_urb))
 122			/* Clear failed; let's hope things work anyway */
 123			chan->qh->tt_buffer_dirty = 0;
 124	}
 125}
 126
 127/*
 128 * Handles the start-of-frame interrupt in host mode. Non-periodic
 129 * transactions may be queued to the DWC_otg controller for the current
 130 * (micro)frame. Periodic transactions may be queued to the controller
 131 * for the next (micro)frame.
 132 */
 133static void dwc2_sof_intr(struct dwc2_hsotg *hsotg)
 134{
 135	struct list_head *qh_entry;
 136	struct dwc2_qh *qh;
 137	enum dwc2_transaction_type tr_type;
 138
 139	/* Clear interrupt */
 140	dwc2_writel(GINTSTS_SOF, hsotg->regs + GINTSTS);
 141
 142#ifdef DEBUG_SOF
 143	dev_vdbg(hsotg->dev, "--Start of Frame Interrupt--\n");
 144#endif
 145
 146	hsotg->frame_number = dwc2_hcd_get_frame_number(hsotg);
 147
 148	dwc2_track_missed_sofs(hsotg);
 149
 150	/* Determine whether any periodic QHs should be executed */
 151	qh_entry = hsotg->periodic_sched_inactive.next;
 152	while (qh_entry != &hsotg->periodic_sched_inactive) {
 153		qh = list_entry(qh_entry, struct dwc2_qh, qh_list_entry);
 154		qh_entry = qh_entry->next;
 155		if (dwc2_frame_num_le(qh->next_active_frame,
 156				      hsotg->frame_number)) {
 157			dwc2_sch_vdbg(hsotg, "QH=%p ready fn=%04x, nxt=%04x\n",
 158				      qh, hsotg->frame_number,
 159				      qh->next_active_frame);
 160
 161			/*
 162			 * Move QH to the ready list to be executed next
 163			 * (micro)frame
 164			 */
 165			list_move_tail(&qh->qh_list_entry,
 166				  &hsotg->periodic_sched_ready);
 167		}
 168	}
 169	tr_type = dwc2_hcd_select_transactions(hsotg);
 170	if (tr_type != DWC2_TRANSACTION_NONE)
 171		dwc2_hcd_queue_transactions(hsotg, tr_type);
 172}
 173
 174/*
 175 * Handles the Rx FIFO Level Interrupt, which indicates that there is
 176 * at least one packet in the Rx FIFO. The packets are moved from the FIFO to
 177 * memory if the DWC_otg controller is operating in Slave mode.
 178 */
 179static void dwc2_rx_fifo_level_intr(struct dwc2_hsotg *hsotg)
 180{
 181	u32 grxsts, chnum, bcnt, dpid, pktsts;
 182	struct dwc2_host_chan *chan;
 183
 184	if (dbg_perio())
 185		dev_vdbg(hsotg->dev, "--RxFIFO Level Interrupt--\n");
 186
 187	grxsts = dwc2_readl(hsotg->regs + GRXSTSP);
 188	chnum = (grxsts & GRXSTS_HCHNUM_MASK) >> GRXSTS_HCHNUM_SHIFT;
 189	chan = hsotg->hc_ptr_array[chnum];
 190	if (!chan) {
 191		dev_err(hsotg->dev, "Unable to get corresponding channel\n");
 192		return;
 193	}
 194
 195	bcnt = (grxsts & GRXSTS_BYTECNT_MASK) >> GRXSTS_BYTECNT_SHIFT;
 196	dpid = (grxsts & GRXSTS_DPID_MASK) >> GRXSTS_DPID_SHIFT;
 197	pktsts = (grxsts & GRXSTS_PKTSTS_MASK) >> GRXSTS_PKTSTS_SHIFT;
 198
 199	/* Packet Status */
 200	if (dbg_perio()) {
 201		dev_vdbg(hsotg->dev, "    Ch num = %d\n", chnum);
 202		dev_vdbg(hsotg->dev, "    Count = %d\n", bcnt);
 203		dev_vdbg(hsotg->dev, "    DPID = %d, chan.dpid = %d\n", dpid,
 204			 chan->data_pid_start);
 205		dev_vdbg(hsotg->dev, "    PStatus = %d\n", pktsts);
 206	}
 207
 208	switch (pktsts) {
 209	case GRXSTS_PKTSTS_HCHIN:
 210		/* Read the data into the host buffer */
 211		if (bcnt > 0) {
 212			dwc2_read_packet(hsotg, chan->xfer_buf, bcnt);
 213
 214			/* Update the HC fields for the next packet received */
 215			chan->xfer_count += bcnt;
 216			chan->xfer_buf += bcnt;
 217		}
 218		break;
 219	case GRXSTS_PKTSTS_HCHIN_XFER_COMP:
 220	case GRXSTS_PKTSTS_DATATOGGLEERR:
 221	case GRXSTS_PKTSTS_HCHHALTED:
 222		/* Handled in interrupt, just ignore data */
 223		break;
 224	default:
 225		dev_err(hsotg->dev,
 226			"RxFIFO Level Interrupt: Unknown status %d\n", pktsts);
 227		break;
 228	}
 229}
 230
 231/*
 232 * This interrupt occurs when the non-periodic Tx FIFO is half-empty. More
 233 * data packets may be written to the FIFO for OUT transfers. More requests
 234 * may be written to the non-periodic request queue for IN transfers. This
 235 * interrupt is enabled only in Slave mode.
 236 */
 237static void dwc2_np_tx_fifo_empty_intr(struct dwc2_hsotg *hsotg)
 238{
 239	dev_vdbg(hsotg->dev, "--Non-Periodic TxFIFO Empty Interrupt--\n");
 240	dwc2_hcd_queue_transactions(hsotg, DWC2_TRANSACTION_NON_PERIODIC);
 241}
 242
 243/*
 244 * This interrupt occurs when the periodic Tx FIFO is half-empty. More data
 245 * packets may be written to the FIFO for OUT transfers. More requests may be
 246 * written to the periodic request queue for IN transfers. This interrupt is
 247 * enabled only in Slave mode.
 248 */
 249static void dwc2_perio_tx_fifo_empty_intr(struct dwc2_hsotg *hsotg)
 250{
 251	if (dbg_perio())
 252		dev_vdbg(hsotg->dev, "--Periodic TxFIFO Empty Interrupt--\n");
 253	dwc2_hcd_queue_transactions(hsotg, DWC2_TRANSACTION_PERIODIC);
 254}
 255
 256static void dwc2_hprt0_enable(struct dwc2_hsotg *hsotg, u32 hprt0,
 257			      u32 *hprt0_modify)
 258{
 259	struct dwc2_core_params *params = hsotg->core_params;
 260	int do_reset = 0;
 261	u32 usbcfg;
 262	u32 prtspd;
 263	u32 hcfg;
 264	u32 fslspclksel;
 265	u32 hfir;
 266
 267	dev_vdbg(hsotg->dev, "%s(%p)\n", __func__, hsotg);
 268
 269	/* Every time when port enables calculate HFIR.FrInterval */
 270	hfir = dwc2_readl(hsotg->regs + HFIR);
 271	hfir &= ~HFIR_FRINT_MASK;
 272	hfir |= dwc2_calc_frame_interval(hsotg) << HFIR_FRINT_SHIFT &
 273		HFIR_FRINT_MASK;
 274	dwc2_writel(hfir, hsotg->regs + HFIR);
 275
 276	/* Check if we need to adjust the PHY clock speed for low power */
 277	if (!params->host_support_fs_ls_low_power) {
 278		/* Port has been enabled, set the reset change flag */
 279		hsotg->flags.b.port_reset_change = 1;
 280		return;
 281	}
 282
 283	usbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
 284	prtspd = (hprt0 & HPRT0_SPD_MASK) >> HPRT0_SPD_SHIFT;
 285
 286	if (prtspd == HPRT0_SPD_LOW_SPEED || prtspd == HPRT0_SPD_FULL_SPEED) {
 287		/* Low power */
 288		if (!(usbcfg & GUSBCFG_PHY_LP_CLK_SEL)) {
 289			/* Set PHY low power clock select for FS/LS devices */
 290			usbcfg |= GUSBCFG_PHY_LP_CLK_SEL;
 291			dwc2_writel(usbcfg, hsotg->regs + GUSBCFG);
 292			do_reset = 1;
 293		}
 294
 295		hcfg = dwc2_readl(hsotg->regs + HCFG);
 296		fslspclksel = (hcfg & HCFG_FSLSPCLKSEL_MASK) >>
 297			      HCFG_FSLSPCLKSEL_SHIFT;
 298
 299		if (prtspd == HPRT0_SPD_LOW_SPEED &&
 300		    params->host_ls_low_power_phy_clk ==
 301		    DWC2_HOST_LS_LOW_POWER_PHY_CLK_PARAM_6MHZ) {
 302			/* 6 MHZ */
 303			dev_vdbg(hsotg->dev,
 304				 "FS_PHY programming HCFG to 6 MHz\n");
 305			if (fslspclksel != HCFG_FSLSPCLKSEL_6_MHZ) {
 306				fslspclksel = HCFG_FSLSPCLKSEL_6_MHZ;
 307				hcfg &= ~HCFG_FSLSPCLKSEL_MASK;
 308				hcfg |= fslspclksel << HCFG_FSLSPCLKSEL_SHIFT;
 309				dwc2_writel(hcfg, hsotg->regs + HCFG);
 310				do_reset = 1;
 311			}
 312		} else {
 313			/* 48 MHZ */
 314			dev_vdbg(hsotg->dev,
 315				 "FS_PHY programming HCFG to 48 MHz\n");
 316			if (fslspclksel != HCFG_FSLSPCLKSEL_48_MHZ) {
 317				fslspclksel = HCFG_FSLSPCLKSEL_48_MHZ;
 318				hcfg &= ~HCFG_FSLSPCLKSEL_MASK;
 319				hcfg |= fslspclksel << HCFG_FSLSPCLKSEL_SHIFT;
 320				dwc2_writel(hcfg, hsotg->regs + HCFG);
 321				do_reset = 1;
 322			}
 323		}
 324	} else {
 325		/* Not low power */
 326		if (usbcfg & GUSBCFG_PHY_LP_CLK_SEL) {
 327			usbcfg &= ~GUSBCFG_PHY_LP_CLK_SEL;
 328			dwc2_writel(usbcfg, hsotg->regs + GUSBCFG);
 329			do_reset = 1;
 330		}
 331	}
 332
 333	if (do_reset) {
 334		*hprt0_modify |= HPRT0_RST;
 335		dwc2_writel(*hprt0_modify, hsotg->regs + HPRT0);
 336		queue_delayed_work(hsotg->wq_otg, &hsotg->reset_work,
 337				   msecs_to_jiffies(60));
 338	} else {
 339		/* Port has been enabled, set the reset change flag */
 340		hsotg->flags.b.port_reset_change = 1;
 341	}
 342}
 343
 344/*
 345 * There are multiple conditions that can cause a port interrupt. This function
 346 * determines which interrupt conditions have occurred and handles them
 347 * appropriately.
 348 */
 349static void dwc2_port_intr(struct dwc2_hsotg *hsotg)
 350{
 351	u32 hprt0;
 352	u32 hprt0_modify;
 353
 354	dev_vdbg(hsotg->dev, "--Port Interrupt--\n");
 355
 356	hprt0 = dwc2_readl(hsotg->regs + HPRT0);
 357	hprt0_modify = hprt0;
 358
 359	/*
 360	 * Clear appropriate bits in HPRT0 to clear the interrupt bit in
 361	 * GINTSTS
 362	 */
 363	hprt0_modify &= ~(HPRT0_ENA | HPRT0_CONNDET | HPRT0_ENACHG |
 364			  HPRT0_OVRCURRCHG);
 365
 366	/*
 367	 * Port Connect Detected
 368	 * Set flag and clear if detected
 369	 */
 370	if (hprt0 & HPRT0_CONNDET) {
 371		dwc2_writel(hprt0_modify | HPRT0_CONNDET, hsotg->regs + HPRT0);
 372
 373		dev_vdbg(hsotg->dev,
 374			 "--Port Interrupt HPRT0=0x%08x Port Connect Detected--\n",
 375			 hprt0);
 376		dwc2_hcd_connect(hsotg);
 377
 378		/*
 379		 * The Hub driver asserts a reset when it sees port connect
 380		 * status change flag
 381		 */
 382	}
 383
 384	/*
 385	 * Port Enable Changed
 386	 * Clear if detected - Set internal flag if disabled
 387	 */
 388	if (hprt0 & HPRT0_ENACHG) {
 389		dwc2_writel(hprt0_modify | HPRT0_ENACHG, hsotg->regs + HPRT0);
 390		dev_vdbg(hsotg->dev,
 391			 "  --Port Interrupt HPRT0=0x%08x Port Enable Changed (now %d)--\n",
 392			 hprt0, !!(hprt0 & HPRT0_ENA));
 393		if (hprt0 & HPRT0_ENA) {
 394			hsotg->new_connection = true;
 395			dwc2_hprt0_enable(hsotg, hprt0, &hprt0_modify);
 396		} else {
 397			hsotg->flags.b.port_enable_change = 1;
 398			if (hsotg->core_params->dma_desc_fs_enable) {
 399				u32 hcfg;
 400
 401				hsotg->core_params->dma_desc_enable = 0;
 402				hsotg->new_connection = false;
 403				hcfg = dwc2_readl(hsotg->regs + HCFG);
 404				hcfg &= ~HCFG_DESCDMA;
 405				dwc2_writel(hcfg, hsotg->regs + HCFG);
 406			}
 407		}
 408	}
 409
 410	/* Overcurrent Change Interrupt */
 411	if (hprt0 & HPRT0_OVRCURRCHG) {
 412		dwc2_writel(hprt0_modify | HPRT0_OVRCURRCHG,
 413			    hsotg->regs + HPRT0);
 414		dev_vdbg(hsotg->dev,
 415			 "  --Port Interrupt HPRT0=0x%08x Port Overcurrent Changed--\n",
 416			 hprt0);
 417		hsotg->flags.b.port_over_current_change = 1;
 418	}
 419}
 420
 421/*
 422 * Gets the actual length of a transfer after the transfer halts. halt_status
 423 * holds the reason for the halt.
 424 *
 425 * For IN transfers where halt_status is DWC2_HC_XFER_COMPLETE, *short_read
 426 * is set to 1 upon return if less than the requested number of bytes were
 427 * transferred. short_read may also be NULL on entry, in which case it remains
 428 * unchanged.
 429 */
 430static u32 dwc2_get_actual_xfer_length(struct dwc2_hsotg *hsotg,
 431				       struct dwc2_host_chan *chan, int chnum,
 432				       struct dwc2_qtd *qtd,
 433				       enum dwc2_halt_status halt_status,
 434				       int *short_read)
 435{
 436	u32 hctsiz, count, length;
 437
 438	hctsiz = dwc2_readl(hsotg->regs + HCTSIZ(chnum));
 439
 440	if (halt_status == DWC2_HC_XFER_COMPLETE) {
 441		if (chan->ep_is_in) {
 442			count = (hctsiz & TSIZ_XFERSIZE_MASK) >>
 443				TSIZ_XFERSIZE_SHIFT;
 444			length = chan->xfer_len - count;
 445			if (short_read != NULL)
 446				*short_read = (count != 0);
 447		} else if (chan->qh->do_split) {
 448			length = qtd->ssplit_out_xfer_count;
 449		} else {
 450			length = chan->xfer_len;
 451		}
 452	} else {
 453		/*
 454		 * Must use the hctsiz.pktcnt field to determine how much data
 455		 * has been transferred. This field reflects the number of
 456		 * packets that have been transferred via the USB. This is
 457		 * always an integral number of packets if the transfer was
 458		 * halted before its normal completion. (Can't use the
 459		 * hctsiz.xfersize field because that reflects the number of
 460		 * bytes transferred via the AHB, not the USB).
 461		 */
 462		count = (hctsiz & TSIZ_PKTCNT_MASK) >> TSIZ_PKTCNT_SHIFT;
 463		length = (chan->start_pkt_count - count) * chan->max_packet;
 464	}
 465
 466	return length;
 467}
 468
 469/**
 470 * dwc2_update_urb_state() - Updates the state of the URB after a Transfer
 471 * Complete interrupt on the host channel. Updates the actual_length field
 472 * of the URB based on the number of bytes transferred via the host channel.
 473 * Sets the URB status if the data transfer is finished.
 474 *
 
 
 
 
 
 
 475 * Return: 1 if the data transfer specified by the URB is completely finished,
 476 * 0 otherwise
 477 */
 478static int dwc2_update_urb_state(struct dwc2_hsotg *hsotg,
 479				 struct dwc2_host_chan *chan, int chnum,
 480				 struct dwc2_hcd_urb *urb,
 481				 struct dwc2_qtd *qtd)
 482{
 483	u32 hctsiz;
 484	int xfer_done = 0;
 485	int short_read = 0;
 486	int xfer_length = dwc2_get_actual_xfer_length(hsotg, chan, chnum, qtd,
 487						      DWC2_HC_XFER_COMPLETE,
 488						      &short_read);
 489
 490	if (urb->actual_length + xfer_length > urb->length) {
 491		dev_warn(hsotg->dev, "%s(): trimming xfer length\n", __func__);
 492		xfer_length = urb->length - urb->actual_length;
 493	}
 494
 495	dev_vdbg(hsotg->dev, "urb->actual_length=%d xfer_length=%d\n",
 496		 urb->actual_length, xfer_length);
 497	urb->actual_length += xfer_length;
 498
 499	if (xfer_length && chan->ep_type == USB_ENDPOINT_XFER_BULK &&
 500	    (urb->flags & URB_SEND_ZERO_PACKET) &&
 501	    urb->actual_length >= urb->length &&
 502	    !(urb->length % chan->max_packet)) {
 503		xfer_done = 0;
 504	} else if (short_read || urb->actual_length >= urb->length) {
 505		xfer_done = 1;
 506		urb->status = 0;
 507	}
 508
 509	hctsiz = dwc2_readl(hsotg->regs + HCTSIZ(chnum));
 510	dev_vdbg(hsotg->dev, "DWC_otg: %s: %s, channel %d\n",
 511		 __func__, (chan->ep_is_in ? "IN" : "OUT"), chnum);
 512	dev_vdbg(hsotg->dev, "  chan->xfer_len %d\n", chan->xfer_len);
 513	dev_vdbg(hsotg->dev, "  hctsiz.xfersize %d\n",
 514		 (hctsiz & TSIZ_XFERSIZE_MASK) >> TSIZ_XFERSIZE_SHIFT);
 515	dev_vdbg(hsotg->dev, "  urb->transfer_buffer_length %d\n", urb->length);
 516	dev_vdbg(hsotg->dev, "  urb->actual_length %d\n", urb->actual_length);
 517	dev_vdbg(hsotg->dev, "  short_read %d, xfer_done %d\n", short_read,
 518		 xfer_done);
 519
 520	return xfer_done;
 521}
 522
 523/*
 524 * Save the starting data toggle for the next transfer. The data toggle is
 525 * saved in the QH for non-control transfers and it's saved in the QTD for
 526 * control transfers.
 527 */
 528void dwc2_hcd_save_data_toggle(struct dwc2_hsotg *hsotg,
 529			       struct dwc2_host_chan *chan, int chnum,
 530			       struct dwc2_qtd *qtd)
 531{
 532	u32 hctsiz = dwc2_readl(hsotg->regs + HCTSIZ(chnum));
 533	u32 pid = (hctsiz & TSIZ_SC_MC_PID_MASK) >> TSIZ_SC_MC_PID_SHIFT;
 534
 535	if (chan->ep_type != USB_ENDPOINT_XFER_CONTROL) {
 536		if (WARN(!chan || !chan->qh,
 537			 "chan->qh must be specified for non-control eps\n"))
 538			return;
 539
 540		if (pid == TSIZ_SC_MC_PID_DATA0)
 541			chan->qh->data_toggle = DWC2_HC_PID_DATA0;
 542		else
 543			chan->qh->data_toggle = DWC2_HC_PID_DATA1;
 544	} else {
 545		if (WARN(!qtd,
 546			 "qtd must be specified for control eps\n"))
 547			return;
 548
 549		if (pid == TSIZ_SC_MC_PID_DATA0)
 550			qtd->data_toggle = DWC2_HC_PID_DATA0;
 551		else
 552			qtd->data_toggle = DWC2_HC_PID_DATA1;
 553	}
 554}
 555
 556/**
 557 * dwc2_update_isoc_urb_state() - Updates the state of an Isochronous URB when
 558 * the transfer is stopped for any reason. The fields of the current entry in
 559 * the frame descriptor array are set based on the transfer state and the input
 560 * halt_status. Completes the Isochronous URB if all the URB frames have been
 561 * completed.
 562 *
 
 
 
 
 
 
 563 * Return: DWC2_HC_XFER_COMPLETE if there are more frames remaining to be
 564 * transferred in the URB. Otherwise return DWC2_HC_XFER_URB_COMPLETE.
 565 */
 566static enum dwc2_halt_status dwc2_update_isoc_urb_state(
 567		struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan,
 568		int chnum, struct dwc2_qtd *qtd,
 569		enum dwc2_halt_status halt_status)
 570{
 571	struct dwc2_hcd_iso_packet_desc *frame_desc;
 572	struct dwc2_hcd_urb *urb = qtd->urb;
 573
 574	if (!urb)
 575		return DWC2_HC_XFER_NO_HALT_STATUS;
 576
 577	frame_desc = &urb->iso_descs[qtd->isoc_frame_index];
 578
 579	switch (halt_status) {
 580	case DWC2_HC_XFER_COMPLETE:
 581		frame_desc->status = 0;
 582		frame_desc->actual_length = dwc2_get_actual_xfer_length(hsotg,
 583					chan, chnum, qtd, halt_status, NULL);
 584		break;
 585	case DWC2_HC_XFER_FRAME_OVERRUN:
 586		urb->error_count++;
 587		if (chan->ep_is_in)
 588			frame_desc->status = -ENOSR;
 589		else
 590			frame_desc->status = -ECOMM;
 591		frame_desc->actual_length = 0;
 592		break;
 593	case DWC2_HC_XFER_BABBLE_ERR:
 594		urb->error_count++;
 595		frame_desc->status = -EOVERFLOW;
 596		/* Don't need to update actual_length in this case */
 597		break;
 598	case DWC2_HC_XFER_XACT_ERR:
 599		urb->error_count++;
 600		frame_desc->status = -EPROTO;
 601		frame_desc->actual_length = dwc2_get_actual_xfer_length(hsotg,
 602					chan, chnum, qtd, halt_status, NULL);
 603
 604		/* Skip whole frame */
 605		if (chan->qh->do_split &&
 606		    chan->ep_type == USB_ENDPOINT_XFER_ISOC && chan->ep_is_in &&
 607		    hsotg->core_params->dma_enable > 0) {
 608			qtd->complete_split = 0;
 609			qtd->isoc_split_offset = 0;
 610		}
 611
 612		break;
 613	default:
 614		dev_err(hsotg->dev, "Unhandled halt_status (%d)\n",
 615			halt_status);
 616		break;
 617	}
 618
 619	if (++qtd->isoc_frame_index == urb->packet_count) {
 620		/*
 621		 * urb->status is not used for isoc transfers. The individual
 622		 * frame_desc statuses are used instead.
 623		 */
 624		dwc2_host_complete(hsotg, qtd, 0);
 625		halt_status = DWC2_HC_XFER_URB_COMPLETE;
 626	} else {
 627		halt_status = DWC2_HC_XFER_COMPLETE;
 628	}
 629
 630	return halt_status;
 631}
 632
 633/*
 634 * Frees the first QTD in the QH's list if free_qtd is 1. For non-periodic
 635 * QHs, removes the QH from the active non-periodic schedule. If any QTDs are
 636 * still linked to the QH, the QH is added to the end of the inactive
 637 * non-periodic schedule. For periodic QHs, removes the QH from the periodic
 638 * schedule if no more QTDs are linked to the QH.
 639 */
 640static void dwc2_deactivate_qh(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh,
 641			       int free_qtd)
 642{
 643	int continue_split = 0;
 644	struct dwc2_qtd *qtd;
 645
 646	if (dbg_qh(qh))
 647		dev_vdbg(hsotg->dev, "  %s(%p,%p,%d)\n", __func__,
 648			 hsotg, qh, free_qtd);
 649
 650	if (list_empty(&qh->qtd_list)) {
 651		dev_dbg(hsotg->dev, "## QTD list empty ##\n");
 652		goto no_qtd;
 653	}
 654
 655	qtd = list_first_entry(&qh->qtd_list, struct dwc2_qtd, qtd_list_entry);
 656
 657	if (qtd->complete_split)
 658		continue_split = 1;
 659	else if (qtd->isoc_split_pos == DWC2_HCSPLT_XACTPOS_MID ||
 660		 qtd->isoc_split_pos == DWC2_HCSPLT_XACTPOS_END)
 661		continue_split = 1;
 662
 663	if (free_qtd) {
 664		dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh);
 665		continue_split = 0;
 666	}
 667
 668no_qtd:
 669	qh->channel = NULL;
 670	dwc2_hcd_qh_deactivate(hsotg, qh, continue_split);
 671}
 672
 673/**
 674 * dwc2_release_channel() - Releases a host channel for use by other transfers
 675 *
 676 * @hsotg:       The HCD state structure
 677 * @chan:        The host channel to release
 678 * @qtd:         The QTD associated with the host channel. This QTD may be
 679 *               freed if the transfer is complete or an error has occurred.
 680 * @halt_status: Reason the channel is being released. This status
 681 *               determines the actions taken by this function.
 682 *
 683 * Also attempts to select and queue more transactions since at least one host
 684 * channel is available.
 685 */
 686static void dwc2_release_channel(struct dwc2_hsotg *hsotg,
 687				 struct dwc2_host_chan *chan,
 688				 struct dwc2_qtd *qtd,
 689				 enum dwc2_halt_status halt_status)
 690{
 691	enum dwc2_transaction_type tr_type;
 692	u32 haintmsk;
 693	int free_qtd = 0;
 694
 695	if (dbg_hc(chan))
 696		dev_vdbg(hsotg->dev, "  %s: channel %d, halt_status %d\n",
 697			 __func__, chan->hc_num, halt_status);
 698
 699	switch (halt_status) {
 700	case DWC2_HC_XFER_URB_COMPLETE:
 701		free_qtd = 1;
 702		break;
 703	case DWC2_HC_XFER_AHB_ERR:
 704	case DWC2_HC_XFER_STALL:
 705	case DWC2_HC_XFER_BABBLE_ERR:
 706		free_qtd = 1;
 707		break;
 708	case DWC2_HC_XFER_XACT_ERR:
 709		if (qtd && qtd->error_count >= 3) {
 710			dev_vdbg(hsotg->dev,
 711				 "  Complete URB with transaction error\n");
 712			free_qtd = 1;
 713			dwc2_host_complete(hsotg, qtd, -EPROTO);
 714		}
 715		break;
 716	case DWC2_HC_XFER_URB_DEQUEUE:
 717		/*
 718		 * The QTD has already been removed and the QH has been
 719		 * deactivated. Don't want to do anything except release the
 720		 * host channel and try to queue more transfers.
 721		 */
 722		goto cleanup;
 723	case DWC2_HC_XFER_PERIODIC_INCOMPLETE:
 724		dev_vdbg(hsotg->dev, "  Complete URB with I/O error\n");
 725		free_qtd = 1;
 726		dwc2_host_complete(hsotg, qtd, -EIO);
 727		break;
 728	case DWC2_HC_XFER_NO_HALT_STATUS:
 729	default:
 730		break;
 731	}
 732
 733	dwc2_deactivate_qh(hsotg, chan->qh, free_qtd);
 734
 735cleanup:
 736	/*
 737	 * Release the host channel for use by other transfers. The cleanup
 738	 * function clears the channel interrupt enables and conditions, so
 739	 * there's no need to clear the Channel Halted interrupt separately.
 740	 */
 741	if (!list_empty(&chan->hc_list_entry))
 742		list_del(&chan->hc_list_entry);
 743	dwc2_hc_cleanup(hsotg, chan);
 744	list_add_tail(&chan->hc_list_entry, &hsotg->free_hc_list);
 745
 746	if (hsotg->core_params->uframe_sched > 0) {
 747		hsotg->available_host_channels++;
 748	} else {
 749		switch (chan->ep_type) {
 750		case USB_ENDPOINT_XFER_CONTROL:
 751		case USB_ENDPOINT_XFER_BULK:
 752			hsotg->non_periodic_channels--;
 753			break;
 754		default:
 755			/*
 756			 * Don't release reservations for periodic channels
 757			 * here. That's done when a periodic transfer is
 758			 * descheduled (i.e. when the QH is removed from the
 759			 * periodic schedule).
 760			 */
 761			break;
 762		}
 763	}
 764
 765	haintmsk = dwc2_readl(hsotg->regs + HAINTMSK);
 766	haintmsk &= ~(1 << chan->hc_num);
 767	dwc2_writel(haintmsk, hsotg->regs + HAINTMSK);
 768
 769	/* Try to queue more transfers now that there's a free channel */
 770	tr_type = dwc2_hcd_select_transactions(hsotg);
 771	if (tr_type != DWC2_TRANSACTION_NONE)
 772		dwc2_hcd_queue_transactions(hsotg, tr_type);
 773}
 774
 775/*
 776 * Halts a host channel. If the channel cannot be halted immediately because
 777 * the request queue is full, this function ensures that the FIFO empty
 778 * interrupt for the appropriate queue is enabled so that the halt request can
 779 * be queued when there is space in the request queue.
 780 *
 781 * This function may also be called in DMA mode. In that case, the channel is
 782 * simply released since the core always halts the channel automatically in
 783 * DMA mode.
 784 */
 785static void dwc2_halt_channel(struct dwc2_hsotg *hsotg,
 786			      struct dwc2_host_chan *chan, struct dwc2_qtd *qtd,
 787			      enum dwc2_halt_status halt_status)
 788{
 789	if (dbg_hc(chan))
 790		dev_vdbg(hsotg->dev, "%s()\n", __func__);
 791
 792	if (hsotg->core_params->dma_enable > 0) {
 793		if (dbg_hc(chan))
 794			dev_vdbg(hsotg->dev, "DMA enabled\n");
 795		dwc2_release_channel(hsotg, chan, qtd, halt_status);
 796		return;
 797	}
 798
 799	/* Slave mode processing */
 800	dwc2_hc_halt(hsotg, chan, halt_status);
 801
 802	if (chan->halt_on_queue) {
 803		u32 gintmsk;
 804
 805		dev_vdbg(hsotg->dev, "Halt on queue\n");
 806		if (chan->ep_type == USB_ENDPOINT_XFER_CONTROL ||
 807		    chan->ep_type == USB_ENDPOINT_XFER_BULK) {
 808			dev_vdbg(hsotg->dev, "control/bulk\n");
 809			/*
 810			 * Make sure the Non-periodic Tx FIFO empty interrupt
 811			 * is enabled so that the non-periodic schedule will
 812			 * be processed
 813			 */
 814			gintmsk = dwc2_readl(hsotg->regs + GINTMSK);
 815			gintmsk |= GINTSTS_NPTXFEMP;
 816			dwc2_writel(gintmsk, hsotg->regs + GINTMSK);
 817		} else {
 818			dev_vdbg(hsotg->dev, "isoc/intr\n");
 819			/*
 820			 * Move the QH from the periodic queued schedule to
 821			 * the periodic assigned schedule. This allows the
 822			 * halt to be queued when the periodic schedule is
 823			 * processed.
 824			 */
 825			list_move_tail(&chan->qh->qh_list_entry,
 826				  &hsotg->periodic_sched_assigned);
 827
 828			/*
 829			 * Make sure the Periodic Tx FIFO Empty interrupt is
 830			 * enabled so that the periodic schedule will be
 831			 * processed
 832			 */
 833			gintmsk = dwc2_readl(hsotg->regs + GINTMSK);
 834			gintmsk |= GINTSTS_PTXFEMP;
 835			dwc2_writel(gintmsk, hsotg->regs + GINTMSK);
 836		}
 837	}
 838}
 839
 840/*
 841 * Performs common cleanup for non-periodic transfers after a Transfer
 842 * Complete interrupt. This function should be called after any endpoint type
 843 * specific handling is finished to release the host channel.
 844 */
 845static void dwc2_complete_non_periodic_xfer(struct dwc2_hsotg *hsotg,
 846					    struct dwc2_host_chan *chan,
 847					    int chnum, struct dwc2_qtd *qtd,
 848					    enum dwc2_halt_status halt_status)
 849{
 850	dev_vdbg(hsotg->dev, "%s()\n", __func__);
 851
 852	qtd->error_count = 0;
 853
 854	if (chan->hcint & HCINTMSK_NYET) {
 855		/*
 856		 * Got a NYET on the last transaction of the transfer. This
 857		 * means that the endpoint should be in the PING state at the
 858		 * beginning of the next transfer.
 859		 */
 860		dev_vdbg(hsotg->dev, "got NYET\n");
 861		chan->qh->ping_state = 1;
 862	}
 863
 864	/*
 865	 * Always halt and release the host channel to make it available for
 866	 * more transfers. There may still be more phases for a control
 867	 * transfer or more data packets for a bulk transfer at this point,
 868	 * but the host channel is still halted. A channel will be reassigned
 869	 * to the transfer when the non-periodic schedule is processed after
 870	 * the channel is released. This allows transactions to be queued
 871	 * properly via dwc2_hcd_queue_transactions, which also enables the
 872	 * Tx FIFO Empty interrupt if necessary.
 873	 */
 874	if (chan->ep_is_in) {
 875		/*
 876		 * IN transfers in Slave mode require an explicit disable to
 877		 * halt the channel. (In DMA mode, this call simply releases
 878		 * the channel.)
 879		 */
 880		dwc2_halt_channel(hsotg, chan, qtd, halt_status);
 881	} else {
 882		/*
 883		 * The channel is automatically disabled by the core for OUT
 884		 * transfers in Slave mode
 885		 */
 886		dwc2_release_channel(hsotg, chan, qtd, halt_status);
 887	}
 888}
 889
 890/*
 891 * Performs common cleanup for periodic transfers after a Transfer Complete
 892 * interrupt. This function should be called after any endpoint type specific
 893 * handling is finished to release the host channel.
 894 */
 895static void dwc2_complete_periodic_xfer(struct dwc2_hsotg *hsotg,
 896					struct dwc2_host_chan *chan, int chnum,
 897					struct dwc2_qtd *qtd,
 898					enum dwc2_halt_status halt_status)
 899{
 900	u32 hctsiz = dwc2_readl(hsotg->regs + HCTSIZ(chnum));
 901
 902	qtd->error_count = 0;
 903
 904	if (!chan->ep_is_in || (hctsiz & TSIZ_PKTCNT_MASK) == 0)
 905		/* Core halts channel in these cases */
 906		dwc2_release_channel(hsotg, chan, qtd, halt_status);
 907	else
 908		/* Flush any outstanding requests from the Tx queue */
 909		dwc2_halt_channel(hsotg, chan, qtd, halt_status);
 910}
 911
 912static int dwc2_xfercomp_isoc_split_in(struct dwc2_hsotg *hsotg,
 913				       struct dwc2_host_chan *chan, int chnum,
 914				       struct dwc2_qtd *qtd)
 915{
 916	struct dwc2_hcd_iso_packet_desc *frame_desc;
 917	u32 len;
 
 
 918
 919	if (!qtd->urb)
 920		return 0;
 921
 922	frame_desc = &qtd->urb->iso_descs[qtd->isoc_frame_index];
 923	len = dwc2_get_actual_xfer_length(hsotg, chan, chnum, qtd,
 924					  DWC2_HC_XFER_COMPLETE, NULL);
 925	if (!len) {
 926		qtd->complete_split = 0;
 927		qtd->isoc_split_offset = 0;
 928		return 0;
 929	}
 930
 931	frame_desc->actual_length += len;
 932
 
 
 
 
 
 
 
 
 933	qtd->isoc_split_offset += len;
 934
 935	if (frame_desc->actual_length >= frame_desc->length) {
 
 
 
 936		frame_desc->status = 0;
 937		qtd->isoc_frame_index++;
 938		qtd->complete_split = 0;
 939		qtd->isoc_split_offset = 0;
 940	}
 941
 942	if (qtd->isoc_frame_index == qtd->urb->packet_count) {
 943		dwc2_host_complete(hsotg, qtd, 0);
 944		dwc2_release_channel(hsotg, chan, qtd,
 945				     DWC2_HC_XFER_URB_COMPLETE);
 946	} else {
 947		dwc2_release_channel(hsotg, chan, qtd,
 948				     DWC2_HC_XFER_NO_HALT_STATUS);
 949	}
 950
 951	return 1;	/* Indicates that channel released */
 952}
 953
 954/*
 955 * Handles a host channel Transfer Complete interrupt. This handler may be
 956 * called in either DMA mode or Slave mode.
 957 */
 958static void dwc2_hc_xfercomp_intr(struct dwc2_hsotg *hsotg,
 959				  struct dwc2_host_chan *chan, int chnum,
 960				  struct dwc2_qtd *qtd)
 961{
 962	struct dwc2_hcd_urb *urb = qtd->urb;
 963	enum dwc2_halt_status halt_status = DWC2_HC_XFER_COMPLETE;
 964	int pipe_type;
 965	int urb_xfer_done;
 966
 967	if (dbg_hc(chan))
 968		dev_vdbg(hsotg->dev,
 969			 "--Host Channel %d Interrupt: Transfer Complete--\n",
 970			 chnum);
 971
 972	if (!urb)
 973		goto handle_xfercomp_done;
 974
 975	pipe_type = dwc2_hcd_get_pipe_type(&urb->pipe_info);
 976
 977	if (hsotg->core_params->dma_desc_enable > 0) {
 978		dwc2_hcd_complete_xfer_ddma(hsotg, chan, chnum, halt_status);
 979		if (pipe_type == USB_ENDPOINT_XFER_ISOC)
 980			/* Do not disable the interrupt, just clear it */
 981			return;
 982		goto handle_xfercomp_done;
 983	}
 984
 985	/* Handle xfer complete on CSPLIT */
 986	if (chan->qh->do_split) {
 987		if (chan->ep_type == USB_ENDPOINT_XFER_ISOC && chan->ep_is_in &&
 988		    hsotg->core_params->dma_enable > 0) {
 989			if (qtd->complete_split &&
 990			    dwc2_xfercomp_isoc_split_in(hsotg, chan, chnum,
 991							qtd))
 992				goto handle_xfercomp_done;
 993		} else {
 994			qtd->complete_split = 0;
 995		}
 996	}
 997
 998	/* Update the QTD and URB states */
 999	switch (pipe_type) {
1000	case USB_ENDPOINT_XFER_CONTROL:
1001		switch (qtd->control_phase) {
1002		case DWC2_CONTROL_SETUP:
1003			if (urb->length > 0)
1004				qtd->control_phase = DWC2_CONTROL_DATA;
1005			else
1006				qtd->control_phase = DWC2_CONTROL_STATUS;
1007			dev_vdbg(hsotg->dev,
1008				 "  Control setup transaction done\n");
1009			halt_status = DWC2_HC_XFER_COMPLETE;
1010			break;
1011		case DWC2_CONTROL_DATA:
1012			urb_xfer_done = dwc2_update_urb_state(hsotg, chan,
1013							      chnum, urb, qtd);
1014			if (urb_xfer_done) {
1015				qtd->control_phase = DWC2_CONTROL_STATUS;
1016				dev_vdbg(hsotg->dev,
1017					 "  Control data transfer done\n");
1018			} else {
1019				dwc2_hcd_save_data_toggle(hsotg, chan, chnum,
1020							  qtd);
1021			}
1022			halt_status = DWC2_HC_XFER_COMPLETE;
1023			break;
1024		case DWC2_CONTROL_STATUS:
1025			dev_vdbg(hsotg->dev, "  Control transfer complete\n");
1026			if (urb->status == -EINPROGRESS)
1027				urb->status = 0;
1028			dwc2_host_complete(hsotg, qtd, urb->status);
1029			halt_status = DWC2_HC_XFER_URB_COMPLETE;
1030			break;
1031		}
1032
1033		dwc2_complete_non_periodic_xfer(hsotg, chan, chnum, qtd,
1034						halt_status);
1035		break;
1036	case USB_ENDPOINT_XFER_BULK:
1037		dev_vdbg(hsotg->dev, "  Bulk transfer complete\n");
1038		urb_xfer_done = dwc2_update_urb_state(hsotg, chan, chnum, urb,
1039						      qtd);
1040		if (urb_xfer_done) {
1041			dwc2_host_complete(hsotg, qtd, urb->status);
1042			halt_status = DWC2_HC_XFER_URB_COMPLETE;
1043		} else {
1044			halt_status = DWC2_HC_XFER_COMPLETE;
1045		}
1046
1047		dwc2_hcd_save_data_toggle(hsotg, chan, chnum, qtd);
1048		dwc2_complete_non_periodic_xfer(hsotg, chan, chnum, qtd,
1049						halt_status);
1050		break;
1051	case USB_ENDPOINT_XFER_INT:
1052		dev_vdbg(hsotg->dev, "  Interrupt transfer complete\n");
1053		urb_xfer_done = dwc2_update_urb_state(hsotg, chan, chnum, urb,
1054						      qtd);
1055
1056		/*
1057		 * Interrupt URB is done on the first transfer complete
1058		 * interrupt
1059		 */
1060		if (urb_xfer_done) {
1061			dwc2_host_complete(hsotg, qtd, urb->status);
1062			halt_status = DWC2_HC_XFER_URB_COMPLETE;
1063		} else {
1064			halt_status = DWC2_HC_XFER_COMPLETE;
1065		}
1066
1067		dwc2_hcd_save_data_toggle(hsotg, chan, chnum, qtd);
1068		dwc2_complete_periodic_xfer(hsotg, chan, chnum, qtd,
1069					    halt_status);
1070		break;
1071	case USB_ENDPOINT_XFER_ISOC:
1072		if (dbg_perio())
1073			dev_vdbg(hsotg->dev, "  Isochronous transfer complete\n");
1074		if (qtd->isoc_split_pos == DWC2_HCSPLT_XACTPOS_ALL)
1075			halt_status = dwc2_update_isoc_urb_state(hsotg, chan,
1076					chnum, qtd, DWC2_HC_XFER_COMPLETE);
 
1077		dwc2_complete_periodic_xfer(hsotg, chan, chnum, qtd,
1078					    halt_status);
1079		break;
1080	}
1081
1082handle_xfercomp_done:
1083	disable_hc_int(hsotg, chnum, HCINTMSK_XFERCOMPL);
1084}
1085
1086/*
1087 * Handles a host channel STALL interrupt. This handler may be called in
1088 * either DMA mode or Slave mode.
1089 */
1090static void dwc2_hc_stall_intr(struct dwc2_hsotg *hsotg,
1091			       struct dwc2_host_chan *chan, int chnum,
1092			       struct dwc2_qtd *qtd)
1093{
1094	struct dwc2_hcd_urb *urb = qtd->urb;
1095	int pipe_type;
1096
1097	dev_dbg(hsotg->dev, "--Host Channel %d Interrupt: STALL Received--\n",
1098		chnum);
1099
1100	if (hsotg->core_params->dma_desc_enable > 0) {
1101		dwc2_hcd_complete_xfer_ddma(hsotg, chan, chnum,
1102					    DWC2_HC_XFER_STALL);
1103		goto handle_stall_done;
1104	}
1105
1106	if (!urb)
1107		goto handle_stall_halt;
1108
1109	pipe_type = dwc2_hcd_get_pipe_type(&urb->pipe_info);
1110
1111	if (pipe_type == USB_ENDPOINT_XFER_CONTROL)
1112		dwc2_host_complete(hsotg, qtd, -EPIPE);
1113
1114	if (pipe_type == USB_ENDPOINT_XFER_BULK ||
1115	    pipe_type == USB_ENDPOINT_XFER_INT) {
1116		dwc2_host_complete(hsotg, qtd, -EPIPE);
1117		/*
1118		 * USB protocol requires resetting the data toggle for bulk
1119		 * and interrupt endpoints when a CLEAR_FEATURE(ENDPOINT_HALT)
1120		 * setup command is issued to the endpoint. Anticipate the
1121		 * CLEAR_FEATURE command since a STALL has occurred and reset
1122		 * the data toggle now.
1123		 */
1124		chan->qh->data_toggle = 0;
1125	}
1126
1127handle_stall_halt:
1128	dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_STALL);
1129
1130handle_stall_done:
1131	disable_hc_int(hsotg, chnum, HCINTMSK_STALL);
1132}
1133
1134/*
1135 * Updates the state of the URB when a transfer has been stopped due to an
1136 * abnormal condition before the transfer completes. Modifies the
1137 * actual_length field of the URB to reflect the number of bytes that have
1138 * actually been transferred via the host channel.
1139 */
1140static void dwc2_update_urb_state_abn(struct dwc2_hsotg *hsotg,
1141				      struct dwc2_host_chan *chan, int chnum,
1142				      struct dwc2_hcd_urb *urb,
1143				      struct dwc2_qtd *qtd,
1144				      enum dwc2_halt_status halt_status)
1145{
1146	u32 xfer_length = dwc2_get_actual_xfer_length(hsotg, chan, chnum,
1147						      qtd, halt_status, NULL);
1148	u32 hctsiz;
1149
1150	if (urb->actual_length + xfer_length > urb->length) {
1151		dev_warn(hsotg->dev, "%s(): trimming xfer length\n", __func__);
1152		xfer_length = urb->length - urb->actual_length;
1153	}
1154
1155	urb->actual_length += xfer_length;
1156
1157	hctsiz = dwc2_readl(hsotg->regs + HCTSIZ(chnum));
1158	dev_vdbg(hsotg->dev, "DWC_otg: %s: %s, channel %d\n",
1159		 __func__, (chan->ep_is_in ? "IN" : "OUT"), chnum);
1160	dev_vdbg(hsotg->dev, "  chan->start_pkt_count %d\n",
1161		 chan->start_pkt_count);
1162	dev_vdbg(hsotg->dev, "  hctsiz.pktcnt %d\n",
1163		 (hctsiz & TSIZ_PKTCNT_MASK) >> TSIZ_PKTCNT_SHIFT);
1164	dev_vdbg(hsotg->dev, "  chan->max_packet %d\n", chan->max_packet);
1165	dev_vdbg(hsotg->dev, "  bytes_transferred %d\n",
1166		 xfer_length);
1167	dev_vdbg(hsotg->dev, "  urb->actual_length %d\n",
1168		 urb->actual_length);
1169	dev_vdbg(hsotg->dev, "  urb->transfer_buffer_length %d\n",
1170		 urb->length);
1171}
1172
1173/*
1174 * Handles a host channel NAK interrupt. This handler may be called in either
1175 * DMA mode or Slave mode.
1176 */
1177static void dwc2_hc_nak_intr(struct dwc2_hsotg *hsotg,
1178			     struct dwc2_host_chan *chan, int chnum,
1179			     struct dwc2_qtd *qtd)
1180{
1181	if (!qtd) {
1182		dev_dbg(hsotg->dev, "%s: qtd is NULL\n", __func__);
1183		return;
1184	}
1185
1186	if (!qtd->urb) {
1187		dev_dbg(hsotg->dev, "%s: qtd->urb is NULL\n", __func__);
1188		return;
1189	}
1190
1191	if (dbg_hc(chan))
1192		dev_vdbg(hsotg->dev, "--Host Channel %d Interrupt: NAK Received--\n",
1193			 chnum);
1194
1195	/*
1196	 * Handle NAK for IN/OUT SSPLIT/CSPLIT transfers, bulk, control, and
1197	 * interrupt. Re-start the SSPLIT transfer.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1198	 */
1199	if (chan->do_split) {
1200		if (chan->complete_split)
1201			qtd->error_count = 0;
1202		qtd->complete_split = 0;
 
 
 
 
1203		dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_NAK);
1204		goto handle_nak_done;
1205	}
1206
1207	switch (dwc2_hcd_get_pipe_type(&qtd->urb->pipe_info)) {
1208	case USB_ENDPOINT_XFER_CONTROL:
1209	case USB_ENDPOINT_XFER_BULK:
1210		if (hsotg->core_params->dma_enable > 0 && chan->ep_is_in) {
1211			/*
1212			 * NAK interrupts are enabled on bulk/control IN
1213			 * transfers in DMA mode for the sole purpose of
1214			 * resetting the error count after a transaction error
1215			 * occurs. The core will continue transferring data.
1216			 */
1217			qtd->error_count = 0;
1218			break;
1219		}
1220
1221		/*
1222		 * NAK interrupts normally occur during OUT transfers in DMA
1223		 * or Slave mode. For IN transfers, more requests will be
1224		 * queued as request queue space is available.
1225		 */
1226		qtd->error_count = 0;
1227
1228		if (!chan->qh->ping_state) {
1229			dwc2_update_urb_state_abn(hsotg, chan, chnum, qtd->urb,
1230						  qtd, DWC2_HC_XFER_NAK);
1231			dwc2_hcd_save_data_toggle(hsotg, chan, chnum, qtd);
1232
1233			if (chan->speed == USB_SPEED_HIGH)
1234				chan->qh->ping_state = 1;
1235		}
1236
1237		/*
1238		 * Halt the channel so the transfer can be re-started from
1239		 * the appropriate point or the PING protocol will
1240		 * start/continue
1241		 */
1242		dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_NAK);
1243		break;
1244	case USB_ENDPOINT_XFER_INT:
1245		qtd->error_count = 0;
1246		dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_NAK);
1247		break;
1248	case USB_ENDPOINT_XFER_ISOC:
1249		/* Should never get called for isochronous transfers */
1250		dev_err(hsotg->dev, "NACK interrupt for ISOC transfer\n");
1251		break;
1252	}
1253
1254handle_nak_done:
1255	disable_hc_int(hsotg, chnum, HCINTMSK_NAK);
1256}
1257
1258/*
1259 * Handles a host channel ACK interrupt. This interrupt is enabled when
1260 * performing the PING protocol in Slave mode, when errors occur during
1261 * either Slave mode or DMA mode, and during Start Split transactions.
1262 */
1263static void dwc2_hc_ack_intr(struct dwc2_hsotg *hsotg,
1264			     struct dwc2_host_chan *chan, int chnum,
1265			     struct dwc2_qtd *qtd)
1266{
1267	struct dwc2_hcd_iso_packet_desc *frame_desc;
1268
1269	if (dbg_hc(chan))
1270		dev_vdbg(hsotg->dev, "--Host Channel %d Interrupt: ACK Received--\n",
1271			 chnum);
1272
1273	if (chan->do_split) {
1274		/* Handle ACK on SSPLIT. ACK should not occur in CSPLIT. */
1275		if (!chan->ep_is_in &&
1276		    chan->data_pid_start != DWC2_HC_PID_SETUP)
1277			qtd->ssplit_out_xfer_count = chan->xfer_len;
1278
1279		if (chan->ep_type != USB_ENDPOINT_XFER_ISOC || chan->ep_is_in) {
1280			qtd->complete_split = 1;
1281			dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_ACK);
1282		} else {
1283			/* ISOC OUT */
1284			switch (chan->xact_pos) {
1285			case DWC2_HCSPLT_XACTPOS_ALL:
1286				break;
1287			case DWC2_HCSPLT_XACTPOS_END:
1288				qtd->isoc_split_pos = DWC2_HCSPLT_XACTPOS_ALL;
1289				qtd->isoc_split_offset = 0;
1290				break;
1291			case DWC2_HCSPLT_XACTPOS_BEGIN:
1292			case DWC2_HCSPLT_XACTPOS_MID:
1293				/*
1294				 * For BEGIN or MID, calculate the length for
1295				 * the next microframe to determine the correct
1296				 * SSPLIT token, either MID or END
1297				 */
1298				frame_desc = &qtd->urb->iso_descs[
1299						qtd->isoc_frame_index];
1300				qtd->isoc_split_offset += 188;
1301
1302				if (frame_desc->length - qtd->isoc_split_offset
1303							<= 188)
1304					qtd->isoc_split_pos =
1305							DWC2_HCSPLT_XACTPOS_END;
1306				else
1307					qtd->isoc_split_pos =
1308							DWC2_HCSPLT_XACTPOS_MID;
1309				break;
1310			}
1311		}
1312	} else {
1313		qtd->error_count = 0;
1314
1315		if (chan->qh->ping_state) {
1316			chan->qh->ping_state = 0;
1317			/*
1318			 * Halt the channel so the transfer can be re-started
1319			 * from the appropriate point. This only happens in
1320			 * Slave mode. In DMA mode, the ping_state is cleared
1321			 * when the transfer is started because the core
1322			 * automatically executes the PING, then the transfer.
1323			 */
1324			dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_ACK);
1325		}
1326	}
1327
1328	/*
1329	 * If the ACK occurred when _not_ in the PING state, let the channel
1330	 * continue transferring data after clearing the error count
1331	 */
1332	disable_hc_int(hsotg, chnum, HCINTMSK_ACK);
1333}
1334
1335/*
1336 * Handles a host channel NYET interrupt. This interrupt should only occur on
1337 * Bulk and Control OUT endpoints and for complete split transactions. If a
1338 * NYET occurs at the same time as a Transfer Complete interrupt, it is
1339 * handled in the xfercomp interrupt handler, not here. This handler may be
1340 * called in either DMA mode or Slave mode.
1341 */
1342static void dwc2_hc_nyet_intr(struct dwc2_hsotg *hsotg,
1343			      struct dwc2_host_chan *chan, int chnum,
1344			      struct dwc2_qtd *qtd)
1345{
1346	if (dbg_hc(chan))
1347		dev_vdbg(hsotg->dev, "--Host Channel %d Interrupt: NYET Received--\n",
1348			 chnum);
1349
1350	/*
1351	 * NYET on CSPLIT
1352	 * re-do the CSPLIT immediately on non-periodic
1353	 */
1354	if (chan->do_split && chan->complete_split) {
1355		if (chan->ep_is_in && chan->ep_type == USB_ENDPOINT_XFER_ISOC &&
1356		    hsotg->core_params->dma_enable > 0) {
1357			qtd->complete_split = 0;
1358			qtd->isoc_split_offset = 0;
1359			qtd->isoc_frame_index++;
1360			if (qtd->urb &&
1361			    qtd->isoc_frame_index == qtd->urb->packet_count) {
1362				dwc2_host_complete(hsotg, qtd, 0);
1363				dwc2_release_channel(hsotg, chan, qtd,
1364						     DWC2_HC_XFER_URB_COMPLETE);
1365			} else {
1366				dwc2_release_channel(hsotg, chan, qtd,
1367						DWC2_HC_XFER_NO_HALT_STATUS);
1368			}
1369			goto handle_nyet_done;
1370		}
1371
1372		if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
1373		    chan->ep_type == USB_ENDPOINT_XFER_ISOC) {
1374			struct dwc2_qh *qh = chan->qh;
1375			bool past_end;
1376
1377			if (hsotg->core_params->uframe_sched <= 0) {
1378				int frnum = dwc2_hcd_get_frame_number(hsotg);
1379
1380				/* Don't have num_hs_transfers; simple logic */
1381				past_end = dwc2_full_frame_num(frnum) !=
1382				     dwc2_full_frame_num(qh->next_active_frame);
1383			} else {
1384				int end_frnum;
1385
1386				/*
1387				* Figure out the end frame based on schedule.
1388				*
1389				* We don't want to go on trying again and again
1390				* forever.  Let's stop when we've done all the
1391				* transfers that were scheduled.
1392				*
1393				* We're going to be comparing start_active_frame
1394				* and next_active_frame, both of which are 1
1395				* before the time the packet goes on the wire,
1396				* so that cancels out.  Basically if had 1
1397				* transfer and we saw 1 NYET then we're done.
1398				* We're getting a NYET here so if next >=
1399				* (start + num_transfers) we're done. The
1400				* complexity is that for all but ISOC_OUT we
1401				* skip one slot.
1402				*/
 
 
 
 
 
1403				end_frnum = dwc2_frame_num_inc(
1404					qh->start_active_frame,
1405					qh->num_hs_transfers);
1406
1407				if (qh->ep_type != USB_ENDPOINT_XFER_ISOC ||
1408				    qh->ep_is_in)
1409					end_frnum =
1410					       dwc2_frame_num_inc(end_frnum, 1);
1411
1412				past_end = dwc2_frame_num_le(
1413					end_frnum, qh->next_active_frame);
1414			}
1415
1416			if (past_end) {
1417				/* Treat this as a transaction error. */
1418#if 0
1419				/*
1420				 * Todo: Fix system performance so this can
1421				 * be treated as an error. Right now complete
1422				 * splits cannot be scheduled precisely enough
1423				 * due to other system activity, so this error
1424				 * occurs regularly in Slave mode.
1425				 */
1426				qtd->error_count++;
1427#endif
1428				qtd->complete_split = 0;
1429				dwc2_halt_channel(hsotg, chan, qtd,
1430						  DWC2_HC_XFER_XACT_ERR);
1431				/* Todo: add support for isoc release */
1432				goto handle_nyet_done;
1433			}
1434		}
1435
1436		dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_NYET);
1437		goto handle_nyet_done;
1438	}
1439
1440	chan->qh->ping_state = 1;
1441	qtd->error_count = 0;
1442
1443	dwc2_update_urb_state_abn(hsotg, chan, chnum, qtd->urb, qtd,
1444				  DWC2_HC_XFER_NYET);
1445	dwc2_hcd_save_data_toggle(hsotg, chan, chnum, qtd);
1446
1447	/*
1448	 * Halt the channel and re-start the transfer so the PING protocol
1449	 * will start
1450	 */
1451	dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_NYET);
1452
1453handle_nyet_done:
1454	disable_hc_int(hsotg, chnum, HCINTMSK_NYET);
1455}
1456
1457/*
1458 * Handles a host channel babble interrupt. This handler may be called in
1459 * either DMA mode or Slave mode.
1460 */
1461static void dwc2_hc_babble_intr(struct dwc2_hsotg *hsotg,
1462				struct dwc2_host_chan *chan, int chnum,
1463				struct dwc2_qtd *qtd)
1464{
1465	dev_dbg(hsotg->dev, "--Host Channel %d Interrupt: Babble Error--\n",
1466		chnum);
1467
1468	dwc2_hc_handle_tt_clear(hsotg, chan, qtd);
1469
1470	if (hsotg->core_params->dma_desc_enable > 0) {
1471		dwc2_hcd_complete_xfer_ddma(hsotg, chan, chnum,
1472					    DWC2_HC_XFER_BABBLE_ERR);
1473		goto disable_int;
1474	}
1475
1476	if (chan->ep_type != USB_ENDPOINT_XFER_ISOC) {
1477		dwc2_host_complete(hsotg, qtd, -EOVERFLOW);
1478		dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_BABBLE_ERR);
1479	} else {
1480		enum dwc2_halt_status halt_status;
1481
1482		halt_status = dwc2_update_isoc_urb_state(hsotg, chan, chnum,
1483						qtd, DWC2_HC_XFER_BABBLE_ERR);
1484		dwc2_halt_channel(hsotg, chan, qtd, halt_status);
1485	}
1486
1487disable_int:
1488	disable_hc_int(hsotg, chnum, HCINTMSK_BBLERR);
1489}
1490
1491/*
1492 * Handles a host channel AHB error interrupt. This handler is only called in
1493 * DMA mode.
1494 */
1495static void dwc2_hc_ahberr_intr(struct dwc2_hsotg *hsotg,
1496				struct dwc2_host_chan *chan, int chnum,
1497				struct dwc2_qtd *qtd)
1498{
1499	struct dwc2_hcd_urb *urb = qtd->urb;
1500	char *pipetype, *speed;
1501	u32 hcchar;
1502	u32 hcsplt;
1503	u32 hctsiz;
1504	u32 hc_dma;
1505
1506	dev_dbg(hsotg->dev, "--Host Channel %d Interrupt: AHB Error--\n",
1507		chnum);
1508
1509	if (!urb)
1510		goto handle_ahberr_halt;
1511
1512	dwc2_hc_handle_tt_clear(hsotg, chan, qtd);
1513
1514	hcchar = dwc2_readl(hsotg->regs + HCCHAR(chnum));
1515	hcsplt = dwc2_readl(hsotg->regs + HCSPLT(chnum));
1516	hctsiz = dwc2_readl(hsotg->regs + HCTSIZ(chnum));
1517	hc_dma = dwc2_readl(hsotg->regs + HCDMA(chnum));
1518
1519	dev_err(hsotg->dev, "AHB ERROR, Channel %d\n", chnum);
1520	dev_err(hsotg->dev, "  hcchar 0x%08x, hcsplt 0x%08x\n", hcchar, hcsplt);
1521	dev_err(hsotg->dev, "  hctsiz 0x%08x, hc_dma 0x%08x\n", hctsiz, hc_dma);
1522	dev_err(hsotg->dev, "  Device address: %d\n",
1523		dwc2_hcd_get_dev_addr(&urb->pipe_info));
1524	dev_err(hsotg->dev, "  Endpoint: %d, %s\n",
1525		dwc2_hcd_get_ep_num(&urb->pipe_info),
1526		dwc2_hcd_is_pipe_in(&urb->pipe_info) ? "IN" : "OUT");
1527
1528	switch (dwc2_hcd_get_pipe_type(&urb->pipe_info)) {
1529	case USB_ENDPOINT_XFER_CONTROL:
1530		pipetype = "CONTROL";
1531		break;
1532	case USB_ENDPOINT_XFER_BULK:
1533		pipetype = "BULK";
1534		break;
1535	case USB_ENDPOINT_XFER_INT:
1536		pipetype = "INTERRUPT";
1537		break;
1538	case USB_ENDPOINT_XFER_ISOC:
1539		pipetype = "ISOCHRONOUS";
1540		break;
1541	default:
1542		pipetype = "UNKNOWN";
1543		break;
1544	}
1545
1546	dev_err(hsotg->dev, "  Endpoint type: %s\n", pipetype);
1547
1548	switch (chan->speed) {
1549	case USB_SPEED_HIGH:
1550		speed = "HIGH";
1551		break;
1552	case USB_SPEED_FULL:
1553		speed = "FULL";
1554		break;
1555	case USB_SPEED_LOW:
1556		speed = "LOW";
1557		break;
1558	default:
1559		speed = "UNKNOWN";
1560		break;
1561	}
1562
1563	dev_err(hsotg->dev, "  Speed: %s\n", speed);
1564
1565	dev_err(hsotg->dev, "  Max packet size: %d\n",
1566		dwc2_hcd_get_mps(&urb->pipe_info));
 
1567	dev_err(hsotg->dev, "  Data buffer length: %d\n", urb->length);
1568	dev_err(hsotg->dev, "  Transfer buffer: %p, Transfer DMA: %08lx\n",
1569		urb->buf, (unsigned long)urb->dma);
1570	dev_err(hsotg->dev, "  Setup buffer: %p, Setup DMA: %08lx\n",
1571		urb->setup_packet, (unsigned long)urb->setup_dma);
1572	dev_err(hsotg->dev, "  Interval: %d\n", urb->interval);
1573
1574	/* Core halts the channel for Descriptor DMA mode */
1575	if (hsotg->core_params->dma_desc_enable > 0) {
1576		dwc2_hcd_complete_xfer_ddma(hsotg, chan, chnum,
1577					    DWC2_HC_XFER_AHB_ERR);
1578		goto handle_ahberr_done;
1579	}
1580
1581	dwc2_host_complete(hsotg, qtd, -EIO);
1582
1583handle_ahberr_halt:
1584	/*
1585	 * Force a channel halt. Don't call dwc2_halt_channel because that won't
1586	 * write to the HCCHARn register in DMA mode to force the halt.
1587	 */
1588	dwc2_hc_halt(hsotg, chan, DWC2_HC_XFER_AHB_ERR);
1589
1590handle_ahberr_done:
1591	disable_hc_int(hsotg, chnum, HCINTMSK_AHBERR);
1592}
1593
1594/*
1595 * Handles a host channel transaction error interrupt. This handler may be
1596 * called in either DMA mode or Slave mode.
1597 */
1598static void dwc2_hc_xacterr_intr(struct dwc2_hsotg *hsotg,
1599				 struct dwc2_host_chan *chan, int chnum,
1600				 struct dwc2_qtd *qtd)
1601{
1602	dev_dbg(hsotg->dev,
1603		"--Host Channel %d Interrupt: Transaction Error--\n", chnum);
1604
1605	dwc2_hc_handle_tt_clear(hsotg, chan, qtd);
1606
1607	if (hsotg->core_params->dma_desc_enable > 0) {
1608		dwc2_hcd_complete_xfer_ddma(hsotg, chan, chnum,
1609					    DWC2_HC_XFER_XACT_ERR);
1610		goto handle_xacterr_done;
1611	}
1612
1613	switch (dwc2_hcd_get_pipe_type(&qtd->urb->pipe_info)) {
1614	case USB_ENDPOINT_XFER_CONTROL:
1615	case USB_ENDPOINT_XFER_BULK:
1616		qtd->error_count++;
1617		if (!chan->qh->ping_state) {
1618
1619			dwc2_update_urb_state_abn(hsotg, chan, chnum, qtd->urb,
1620						  qtd, DWC2_HC_XFER_XACT_ERR);
1621			dwc2_hcd_save_data_toggle(hsotg, chan, chnum, qtd);
1622			if (!chan->ep_is_in && chan->speed == USB_SPEED_HIGH)
1623				chan->qh->ping_state = 1;
1624		}
1625
1626		/*
1627		 * Halt the channel so the transfer can be re-started from
1628		 * the appropriate point or the PING protocol will start
1629		 */
1630		dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_XACT_ERR);
1631		break;
1632	case USB_ENDPOINT_XFER_INT:
1633		qtd->error_count++;
1634		if (chan->do_split && chan->complete_split)
1635			qtd->complete_split = 0;
1636		dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_XACT_ERR);
1637		break;
1638	case USB_ENDPOINT_XFER_ISOC:
1639		{
1640			enum dwc2_halt_status halt_status;
1641
1642			halt_status = dwc2_update_isoc_urb_state(hsotg, chan,
1643					chnum, qtd, DWC2_HC_XFER_XACT_ERR);
1644			dwc2_halt_channel(hsotg, chan, qtd, halt_status);
1645		}
1646		break;
1647	}
1648
1649handle_xacterr_done:
1650	disable_hc_int(hsotg, chnum, HCINTMSK_XACTERR);
1651}
1652
1653/*
1654 * Handles a host channel frame overrun interrupt. This handler may be called
1655 * in either DMA mode or Slave mode.
1656 */
1657static void dwc2_hc_frmovrun_intr(struct dwc2_hsotg *hsotg,
1658				  struct dwc2_host_chan *chan, int chnum,
1659				  struct dwc2_qtd *qtd)
1660{
1661	enum dwc2_halt_status halt_status;
1662
1663	if (dbg_hc(chan))
1664		dev_dbg(hsotg->dev, "--Host Channel %d Interrupt: Frame Overrun--\n",
1665			chnum);
1666
1667	dwc2_hc_handle_tt_clear(hsotg, chan, qtd);
1668
1669	switch (dwc2_hcd_get_pipe_type(&qtd->urb->pipe_info)) {
1670	case USB_ENDPOINT_XFER_CONTROL:
1671	case USB_ENDPOINT_XFER_BULK:
1672		break;
1673	case USB_ENDPOINT_XFER_INT:
1674		dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_FRAME_OVERRUN);
1675		break;
1676	case USB_ENDPOINT_XFER_ISOC:
1677		halt_status = dwc2_update_isoc_urb_state(hsotg, chan, chnum,
1678					qtd, DWC2_HC_XFER_FRAME_OVERRUN);
1679		dwc2_halt_channel(hsotg, chan, qtd, halt_status);
1680		break;
1681	}
1682
1683	disable_hc_int(hsotg, chnum, HCINTMSK_FRMOVRUN);
1684}
1685
1686/*
1687 * Handles a host channel data toggle error interrupt. This handler may be
1688 * called in either DMA mode or Slave mode.
1689 */
1690static void dwc2_hc_datatglerr_intr(struct dwc2_hsotg *hsotg,
1691				    struct dwc2_host_chan *chan, int chnum,
1692				    struct dwc2_qtd *qtd)
1693{
1694	dev_dbg(hsotg->dev,
1695		"--Host Channel %d Interrupt: Data Toggle Error--\n", chnum);
1696
1697	if (chan->ep_is_in)
1698		qtd->error_count = 0;
1699	else
1700		dev_err(hsotg->dev,
1701			"Data Toggle Error on OUT transfer, channel %d\n",
1702			chnum);
1703
1704	dwc2_hc_handle_tt_clear(hsotg, chan, qtd);
1705	disable_hc_int(hsotg, chnum, HCINTMSK_DATATGLERR);
1706}
1707
1708/*
1709 * For debug only. It checks that a valid halt status is set and that
1710 * HCCHARn.chdis is clear. If there's a problem, corrective action is
1711 * taken and a warning is issued.
1712 *
1713 * Return: true if halt status is ok, false otherwise
1714 */
1715static bool dwc2_halt_status_ok(struct dwc2_hsotg *hsotg,
1716				struct dwc2_host_chan *chan, int chnum,
1717				struct dwc2_qtd *qtd)
1718{
1719#ifdef DEBUG
1720	u32 hcchar;
1721	u32 hctsiz;
1722	u32 hcintmsk;
1723	u32 hcsplt;
1724
1725	if (chan->halt_status == DWC2_HC_XFER_NO_HALT_STATUS) {
1726		/*
1727		 * This code is here only as a check. This condition should
1728		 * never happen. Ignore the halt if it does occur.
1729		 */
1730		hcchar = dwc2_readl(hsotg->regs + HCCHAR(chnum));
1731		hctsiz = dwc2_readl(hsotg->regs + HCTSIZ(chnum));
1732		hcintmsk = dwc2_readl(hsotg->regs + HCINTMSK(chnum));
1733		hcsplt = dwc2_readl(hsotg->regs + HCSPLT(chnum));
1734		dev_dbg(hsotg->dev,
1735			"%s: chan->halt_status DWC2_HC_XFER_NO_HALT_STATUS,\n",
1736			 __func__);
1737		dev_dbg(hsotg->dev,
1738			"channel %d, hcchar 0x%08x, hctsiz 0x%08x,\n",
1739			chnum, hcchar, hctsiz);
1740		dev_dbg(hsotg->dev,
1741			"hcint 0x%08x, hcintmsk 0x%08x, hcsplt 0x%08x,\n",
1742			chan->hcint, hcintmsk, hcsplt);
1743		if (qtd)
1744			dev_dbg(hsotg->dev, "qtd->complete_split %d\n",
1745				qtd->complete_split);
1746		dev_warn(hsotg->dev,
1747			 "%s: no halt status, channel %d, ignoring interrupt\n",
1748			 __func__, chnum);
1749		return false;
1750	}
1751
1752	/*
1753	 * This code is here only as a check. hcchar.chdis should never be set
1754	 * when the halt interrupt occurs. Halt the channel again if it does
1755	 * occur.
1756	 */
1757	hcchar = dwc2_readl(hsotg->regs + HCCHAR(chnum));
1758	if (hcchar & HCCHAR_CHDIS) {
1759		dev_warn(hsotg->dev,
1760			 "%s: hcchar.chdis set unexpectedly, hcchar 0x%08x, trying to halt again\n",
1761			 __func__, hcchar);
1762		chan->halt_pending = 0;
1763		dwc2_halt_channel(hsotg, chan, qtd, chan->halt_status);
1764		return false;
1765	}
1766#endif
1767
1768	return true;
1769}
1770
1771/*
1772 * Handles a host Channel Halted interrupt in DMA mode. This handler
1773 * determines the reason the channel halted and proceeds accordingly.
1774 */
1775static void dwc2_hc_chhltd_intr_dma(struct dwc2_hsotg *hsotg,
1776				    struct dwc2_host_chan *chan, int chnum,
1777				    struct dwc2_qtd *qtd)
1778{
1779	u32 hcintmsk;
1780	int out_nak_enh = 0;
1781
1782	if (dbg_hc(chan))
1783		dev_vdbg(hsotg->dev,
1784			 "--Host Channel %d Interrupt: DMA Channel Halted--\n",
1785			 chnum);
1786
1787	/*
1788	 * For core with OUT NAK enhancement, the flow for high-speed
1789	 * CONTROL/BULK OUT is handled a little differently
1790	 */
1791	if (hsotg->hw_params.snpsid >= DWC2_CORE_REV_2_71a) {
1792		if (chan->speed == USB_SPEED_HIGH && !chan->ep_is_in &&
1793		    (chan->ep_type == USB_ENDPOINT_XFER_CONTROL ||
1794		     chan->ep_type == USB_ENDPOINT_XFER_BULK)) {
1795			out_nak_enh = 1;
1796		}
1797	}
1798
1799	if (chan->halt_status == DWC2_HC_XFER_URB_DEQUEUE ||
1800	    (chan->halt_status == DWC2_HC_XFER_AHB_ERR &&
1801	     hsotg->core_params->dma_desc_enable <= 0)) {
1802		if (hsotg->core_params->dma_desc_enable > 0)
1803			dwc2_hcd_complete_xfer_ddma(hsotg, chan, chnum,
1804						    chan->halt_status);
1805		else
1806			/*
1807			 * Just release the channel. A dequeue can happen on a
1808			 * transfer timeout. In the case of an AHB Error, the
1809			 * channel was forced to halt because there's no way to
1810			 * gracefully recover.
1811			 */
1812			dwc2_release_channel(hsotg, chan, qtd,
1813					     chan->halt_status);
1814		return;
1815	}
1816
1817	hcintmsk = dwc2_readl(hsotg->regs + HCINTMSK(chnum));
1818
1819	if (chan->hcint & HCINTMSK_XFERCOMPL) {
1820		/*
1821		 * Todo: This is here because of a possible hardware bug. Spec
1822		 * says that on SPLIT-ISOC OUT transfers in DMA mode that a HALT
1823		 * interrupt w/ACK bit set should occur, but I only see the
1824		 * XFERCOMP bit, even with it masked out. This is a workaround
1825		 * for that behavior. Should fix this when hardware is fixed.
1826		 */
1827		if (chan->ep_type == USB_ENDPOINT_XFER_ISOC && !chan->ep_is_in)
1828			dwc2_hc_ack_intr(hsotg, chan, chnum, qtd);
1829		dwc2_hc_xfercomp_intr(hsotg, chan, chnum, qtd);
1830	} else if (chan->hcint & HCINTMSK_STALL) {
1831		dwc2_hc_stall_intr(hsotg, chan, chnum, qtd);
1832	} else if ((chan->hcint & HCINTMSK_XACTERR) &&
1833		   hsotg->core_params->dma_desc_enable <= 0) {
1834		if (out_nak_enh) {
1835			if (chan->hcint &
1836			    (HCINTMSK_NYET | HCINTMSK_NAK | HCINTMSK_ACK)) {
1837				dev_vdbg(hsotg->dev,
1838					 "XactErr with NYET/NAK/ACK\n");
1839				qtd->error_count = 0;
1840			} else {
1841				dev_vdbg(hsotg->dev,
1842					 "XactErr without NYET/NAK/ACK\n");
1843			}
1844		}
1845
1846		/*
1847		 * Must handle xacterr before nak or ack. Could get a xacterr
1848		 * at the same time as either of these on a BULK/CONTROL OUT
1849		 * that started with a PING. The xacterr takes precedence.
1850		 */
1851		dwc2_hc_xacterr_intr(hsotg, chan, chnum, qtd);
1852	} else if ((chan->hcint & HCINTMSK_XCS_XACT) &&
1853		   hsotg->core_params->dma_desc_enable > 0) {
1854		dwc2_hc_xacterr_intr(hsotg, chan, chnum, qtd);
1855	} else if ((chan->hcint & HCINTMSK_AHBERR) &&
1856		   hsotg->core_params->dma_desc_enable > 0) {
1857		dwc2_hc_ahberr_intr(hsotg, chan, chnum, qtd);
1858	} else if (chan->hcint & HCINTMSK_BBLERR) {
1859		dwc2_hc_babble_intr(hsotg, chan, chnum, qtd);
1860	} else if (chan->hcint & HCINTMSK_FRMOVRUN) {
1861		dwc2_hc_frmovrun_intr(hsotg, chan, chnum, qtd);
1862	} else if (!out_nak_enh) {
1863		if (chan->hcint & HCINTMSK_NYET) {
1864			/*
1865			 * Must handle nyet before nak or ack. Could get a nyet
1866			 * at the same time as either of those on a BULK/CONTROL
1867			 * OUT that started with a PING. The nyet takes
1868			 * precedence.
1869			 */
1870			dwc2_hc_nyet_intr(hsotg, chan, chnum, qtd);
1871		} else if ((chan->hcint & HCINTMSK_NAK) &&
1872			   !(hcintmsk & HCINTMSK_NAK)) {
1873			/*
1874			 * If nak is not masked, it's because a non-split IN
1875			 * transfer is in an error state. In that case, the nak
1876			 * is handled by the nak interrupt handler, not here.
1877			 * Handle nak here for BULK/CONTROL OUT transfers, which
1878			 * halt on a NAK to allow rewinding the buffer pointer.
1879			 */
1880			dwc2_hc_nak_intr(hsotg, chan, chnum, qtd);
1881		} else if ((chan->hcint & HCINTMSK_ACK) &&
1882			   !(hcintmsk & HCINTMSK_ACK)) {
1883			/*
1884			 * If ack is not masked, it's because a non-split IN
1885			 * transfer is in an error state. In that case, the ack
1886			 * is handled by the ack interrupt handler, not here.
1887			 * Handle ack here for split transfers. Start splits
1888			 * halt on ACK.
1889			 */
1890			dwc2_hc_ack_intr(hsotg, chan, chnum, qtd);
1891		} else {
1892			if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
1893			    chan->ep_type == USB_ENDPOINT_XFER_ISOC) {
1894				/*
1895				 * A periodic transfer halted with no other
1896				 * channel interrupts set. Assume it was halted
1897				 * by the core because it could not be completed
1898				 * in its scheduled (micro)frame.
1899				 */
1900				dev_dbg(hsotg->dev,
1901					"%s: Halt channel %d (assume incomplete periodic transfer)\n",
1902					__func__, chnum);
1903				dwc2_halt_channel(hsotg, chan, qtd,
1904					DWC2_HC_XFER_PERIODIC_INCOMPLETE);
1905			} else {
1906				dev_err(hsotg->dev,
1907					"%s: Channel %d - ChHltd set, but reason is unknown\n",
1908					__func__, chnum);
1909				dev_err(hsotg->dev,
1910					"hcint 0x%08x, intsts 0x%08x\n",
1911					chan->hcint,
1912					dwc2_readl(hsotg->regs + GINTSTS));
1913				goto error;
1914			}
1915		}
1916	} else {
1917		dev_info(hsotg->dev,
1918			 "NYET/NAK/ACK/other in non-error case, 0x%08x\n",
1919			 chan->hcint);
1920error:
1921		/* Failthrough: use 3-strikes rule */
1922		qtd->error_count++;
1923		dwc2_update_urb_state_abn(hsotg, chan, chnum, qtd->urb,
1924					  qtd, DWC2_HC_XFER_XACT_ERR);
 
 
 
 
 
 
 
 
 
 
 
 
1925		dwc2_hcd_save_data_toggle(hsotg, chan, chnum, qtd);
1926		dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_XACT_ERR);
1927	}
1928}
1929
1930/*
1931 * Handles a host channel Channel Halted interrupt
1932 *
1933 * In slave mode, this handler is called only when the driver specifically
1934 * requests a halt. This occurs during handling other host channel interrupts
1935 * (e.g. nak, xacterr, stall, nyet, etc.).
1936 *
1937 * In DMA mode, this is the interrupt that occurs when the core has finished
1938 * processing a transfer on a channel. Other host channel interrupts (except
1939 * ahberr) are disabled in DMA mode.
1940 */
1941static void dwc2_hc_chhltd_intr(struct dwc2_hsotg *hsotg,
1942				struct dwc2_host_chan *chan, int chnum,
1943				struct dwc2_qtd *qtd)
1944{
1945	if (dbg_hc(chan))
1946		dev_vdbg(hsotg->dev, "--Host Channel %d Interrupt: Channel Halted--\n",
1947			 chnum);
1948
1949	if (hsotg->core_params->dma_enable > 0) {
1950		dwc2_hc_chhltd_intr_dma(hsotg, chan, chnum, qtd);
1951	} else {
1952		if (!dwc2_halt_status_ok(hsotg, chan, chnum, qtd))
1953			return;
1954		dwc2_release_channel(hsotg, chan, qtd, chan->halt_status);
1955	}
1956}
1957
1958/*
1959 * Check if the given qtd is still the top of the list (and thus valid).
1960 *
1961 * If dwc2_hcd_qtd_unlink_and_free() has been called since we grabbed
1962 * the qtd from the top of the list, this will return false (otherwise true).
1963 */
1964static bool dwc2_check_qtd_still_ok(struct dwc2_qtd *qtd, struct dwc2_qh *qh)
1965{
1966	struct dwc2_qtd *cur_head;
1967
1968	if (qh == NULL)
1969		return false;
1970
1971	cur_head = list_first_entry(&qh->qtd_list, struct dwc2_qtd,
1972				    qtd_list_entry);
1973	return (cur_head == qtd);
1974}
1975
1976/* Handles interrupt for a specific Host Channel */
1977static void dwc2_hc_n_intr(struct dwc2_hsotg *hsotg, int chnum)
1978{
1979	struct dwc2_qtd *qtd;
1980	struct dwc2_host_chan *chan;
1981	u32 hcint, hcintmsk;
1982
1983	chan = hsotg->hc_ptr_array[chnum];
1984
1985	hcint = dwc2_readl(hsotg->regs + HCINT(chnum));
1986	hcintmsk = dwc2_readl(hsotg->regs + HCINTMSK(chnum));
1987	if (!chan) {
1988		dev_err(hsotg->dev, "## hc_ptr_array for channel is NULL ##\n");
1989		dwc2_writel(hcint, hsotg->regs + HCINT(chnum));
1990		return;
1991	}
1992
1993	if (dbg_hc(chan)) {
1994		dev_vdbg(hsotg->dev, "--Host Channel Interrupt--, Channel %d\n",
1995			 chnum);
1996		dev_vdbg(hsotg->dev,
1997			 "  hcint 0x%08x, hcintmsk 0x%08x, hcint&hcintmsk 0x%08x\n",
1998			 hcint, hcintmsk, hcint & hcintmsk);
1999	}
2000
2001	dwc2_writel(hcint, hsotg->regs + HCINT(chnum));
2002
2003	/*
2004	 * If we got an interrupt after someone called
2005	 * dwc2_hcd_endpoint_disable() we don't want to crash below
2006	 */
2007	if (!chan->qh) {
2008		dev_warn(hsotg->dev, "Interrupt on disabled channel\n");
2009		return;
2010	}
2011
2012	chan->hcint = hcint;
2013	hcint &= hcintmsk;
2014
2015	/*
2016	 * If the channel was halted due to a dequeue, the qtd list might
2017	 * be empty or at least the first entry will not be the active qtd.
2018	 * In this case, take a shortcut and just release the channel.
2019	 */
2020	if (chan->halt_status == DWC2_HC_XFER_URB_DEQUEUE) {
2021		/*
2022		 * If the channel was halted, this should be the only
2023		 * interrupt unmasked
2024		 */
2025		WARN_ON(hcint != HCINTMSK_CHHLTD);
2026		if (hsotg->core_params->dma_desc_enable > 0)
2027			dwc2_hcd_complete_xfer_ddma(hsotg, chan, chnum,
2028						    chan->halt_status);
2029		else
2030			dwc2_release_channel(hsotg, chan, NULL,
2031					     chan->halt_status);
2032		return;
2033	}
2034
2035	if (list_empty(&chan->qh->qtd_list)) {
2036		/*
2037		 * TODO: Will this ever happen with the
2038		 * DWC2_HC_XFER_URB_DEQUEUE handling above?
2039		 */
2040		dev_dbg(hsotg->dev, "## no QTD queued for channel %d ##\n",
2041			chnum);
2042		dev_dbg(hsotg->dev,
2043			"  hcint 0x%08x, hcintmsk 0x%08x, hcint&hcintmsk 0x%08x\n",
2044			chan->hcint, hcintmsk, hcint);
2045		chan->halt_status = DWC2_HC_XFER_NO_HALT_STATUS;
2046		disable_hc_int(hsotg, chnum, HCINTMSK_CHHLTD);
2047		chan->hcint = 0;
2048		return;
2049	}
2050
2051	qtd = list_first_entry(&chan->qh->qtd_list, struct dwc2_qtd,
2052			       qtd_list_entry);
2053
2054	if (hsotg->core_params->dma_enable <= 0) {
2055		if ((hcint & HCINTMSK_CHHLTD) && hcint != HCINTMSK_CHHLTD)
2056			hcint &= ~HCINTMSK_CHHLTD;
2057	}
2058
2059	if (hcint & HCINTMSK_XFERCOMPL) {
2060		dwc2_hc_xfercomp_intr(hsotg, chan, chnum, qtd);
2061		/*
2062		 * If NYET occurred at same time as Xfer Complete, the NYET is
2063		 * handled by the Xfer Complete interrupt handler. Don't want
2064		 * to call the NYET interrupt handler in this case.
2065		 */
2066		hcint &= ~HCINTMSK_NYET;
2067	}
2068
2069	if (hcint & HCINTMSK_CHHLTD) {
2070		dwc2_hc_chhltd_intr(hsotg, chan, chnum, qtd);
2071		if (!dwc2_check_qtd_still_ok(qtd, chan->qh))
2072			goto exit;
2073	}
2074	if (hcint & HCINTMSK_AHBERR) {
2075		dwc2_hc_ahberr_intr(hsotg, chan, chnum, qtd);
2076		if (!dwc2_check_qtd_still_ok(qtd, chan->qh))
2077			goto exit;
2078	}
2079	if (hcint & HCINTMSK_STALL) {
2080		dwc2_hc_stall_intr(hsotg, chan, chnum, qtd);
2081		if (!dwc2_check_qtd_still_ok(qtd, chan->qh))
2082			goto exit;
2083	}
2084	if (hcint & HCINTMSK_NAK) {
2085		dwc2_hc_nak_intr(hsotg, chan, chnum, qtd);
2086		if (!dwc2_check_qtd_still_ok(qtd, chan->qh))
2087			goto exit;
2088	}
2089	if (hcint & HCINTMSK_ACK) {
2090		dwc2_hc_ack_intr(hsotg, chan, chnum, qtd);
2091		if (!dwc2_check_qtd_still_ok(qtd, chan->qh))
2092			goto exit;
2093	}
2094	if (hcint & HCINTMSK_NYET) {
2095		dwc2_hc_nyet_intr(hsotg, chan, chnum, qtd);
2096		if (!dwc2_check_qtd_still_ok(qtd, chan->qh))
2097			goto exit;
2098	}
2099	if (hcint & HCINTMSK_XACTERR) {
2100		dwc2_hc_xacterr_intr(hsotg, chan, chnum, qtd);
2101		if (!dwc2_check_qtd_still_ok(qtd, chan->qh))
2102			goto exit;
2103	}
2104	if (hcint & HCINTMSK_BBLERR) {
2105		dwc2_hc_babble_intr(hsotg, chan, chnum, qtd);
2106		if (!dwc2_check_qtd_still_ok(qtd, chan->qh))
2107			goto exit;
2108	}
2109	if (hcint & HCINTMSK_FRMOVRUN) {
2110		dwc2_hc_frmovrun_intr(hsotg, chan, chnum, qtd);
2111		if (!dwc2_check_qtd_still_ok(qtd, chan->qh))
2112			goto exit;
2113	}
2114	if (hcint & HCINTMSK_DATATGLERR) {
2115		dwc2_hc_datatglerr_intr(hsotg, chan, chnum, qtd);
2116		if (!dwc2_check_qtd_still_ok(qtd, chan->qh))
2117			goto exit;
2118	}
2119
2120exit:
2121	chan->hcint = 0;
2122}
2123
2124/*
2125 * This interrupt indicates that one or more host channels has a pending
2126 * interrupt. There are multiple conditions that can cause each host channel
2127 * interrupt. This function determines which conditions have occurred for each
2128 * host channel interrupt and handles them appropriately.
2129 */
2130static void dwc2_hc_intr(struct dwc2_hsotg *hsotg)
2131{
2132	u32 haint;
2133	int i;
2134	struct dwc2_host_chan *chan, *chan_tmp;
2135
2136	haint = dwc2_readl(hsotg->regs + HAINT);
2137	if (dbg_perio()) {
2138		dev_vdbg(hsotg->dev, "%s()\n", __func__);
2139
2140		dev_vdbg(hsotg->dev, "HAINT=%08x\n", haint);
2141	}
2142
2143	/*
2144	 * According to USB 2.0 spec section 11.18.8, a host must
2145	 * issue complete-split transactions in a microframe for a
2146	 * set of full-/low-speed endpoints in the same relative
2147	 * order as the start-splits were issued in a microframe for.
2148	 */
2149	list_for_each_entry_safe(chan, chan_tmp, &hsotg->split_order,
2150				 split_order_list_entry) {
2151		int hc_num = chan->hc_num;
2152
2153		if (haint & (1 << hc_num)) {
2154			dwc2_hc_n_intr(hsotg, hc_num);
2155			haint &= ~(1 << hc_num);
2156		}
2157	}
2158
2159	for (i = 0; i < hsotg->core_params->host_channels; i++) {
2160		if (haint & (1 << i))
2161			dwc2_hc_n_intr(hsotg, i);
2162	}
2163}
2164
2165/* This function handles interrupts for the HCD */
2166irqreturn_t dwc2_handle_hcd_intr(struct dwc2_hsotg *hsotg)
2167{
2168	u32 gintsts, dbg_gintsts;
2169	irqreturn_t retval = IRQ_NONE;
2170
2171	if (!dwc2_is_controller_alive(hsotg)) {
2172		dev_warn(hsotg->dev, "Controller is dead\n");
2173		return retval;
2174	}
2175
2176	spin_lock(&hsotg->lock);
2177
2178	/* Check if HOST Mode */
2179	if (dwc2_is_host_mode(hsotg)) {
2180		gintsts = dwc2_read_core_intr(hsotg);
2181		if (!gintsts) {
2182			spin_unlock(&hsotg->lock);
2183			return retval;
2184		}
2185
2186		retval = IRQ_HANDLED;
2187
2188		dbg_gintsts = gintsts;
2189#ifndef DEBUG_SOF
2190		dbg_gintsts &= ~GINTSTS_SOF;
2191#endif
2192		if (!dbg_perio())
2193			dbg_gintsts &= ~(GINTSTS_HCHINT | GINTSTS_RXFLVL |
2194					 GINTSTS_PTXFEMP);
2195
2196		/* Only print if there are any non-suppressed interrupts left */
2197		if (dbg_gintsts)
2198			dev_vdbg(hsotg->dev,
2199				 "DWC OTG HCD Interrupt Detected gintsts&gintmsk=0x%08x\n",
2200				 gintsts);
2201
2202		if (gintsts & GINTSTS_SOF)
2203			dwc2_sof_intr(hsotg);
2204		if (gintsts & GINTSTS_RXFLVL)
2205			dwc2_rx_fifo_level_intr(hsotg);
2206		if (gintsts & GINTSTS_NPTXFEMP)
2207			dwc2_np_tx_fifo_empty_intr(hsotg);
2208		if (gintsts & GINTSTS_PRTINT)
2209			dwc2_port_intr(hsotg);
2210		if (gintsts & GINTSTS_HCHINT)
2211			dwc2_hc_intr(hsotg);
2212		if (gintsts & GINTSTS_PTXFEMP)
2213			dwc2_perio_tx_fifo_empty_intr(hsotg);
2214
2215		if (dbg_gintsts) {
2216			dev_vdbg(hsotg->dev,
2217				 "DWC OTG HCD Finished Servicing Interrupts\n");
2218			dev_vdbg(hsotg->dev,
2219				 "DWC OTG HCD gintsts=0x%08x gintmsk=0x%08x\n",
2220				 dwc2_readl(hsotg->regs + GINTSTS),
2221				 dwc2_readl(hsotg->regs + GINTMSK));
2222		}
2223	}
2224
2225	spin_unlock(&hsotg->lock);
2226
2227	return retval;
2228}