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linuxdebug/drivers/usb/dwc2/hcd_intr.c

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null pointer error
2024-07-16 15:50:57 +02:00
// 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.
*/
/*
* 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, hcintmsk;
chan = hsotg->hc_ptr_array[chnum];
hcint = dwc2_readl(hsotg, HCINT(chnum));
hcintmsk = dwc2_readl(hsotg, HCINTMSK(chnum));
if (!chan) {
dev_err(hsotg->dev, "## hc_ptr_array for channel is NULL ##\n");
dwc2_writel(hsotg, hcint, HCINT(chnum));
return;
}
if (dbg_hc(chan)) {
dev_vdbg(hsotg->dev, "--Host Channel Interrupt--, Channel %d\n",
chnum);
dev_vdbg(hsotg->dev,
" hcint 0x%08x, hcintmsk 0x%08x, hcint&hcintmsk 0x%08x\n",
hcint, hcintmsk, hcint & hcintmsk);
}
dwc2_writel(hsotg, hcint, HCINT(chnum));
/*
* If we got an interrupt after someone called
* dwc2_hcd_endpoint_disable() we don't want to crash below
*/
if (!chan->qh) {
dev_warn(hsotg->dev, "Interrupt on disabled channel\n");
return;
}
chan->hcint = hcint;
hcint &= hcintmsk;
/*
* If the channel was halted due to a dequeue, the qtd list might
* be empty or at least the first entry will not be the active qtd.
* In this case, take a shortcut and just release the channel.
*/
if (chan->halt_status == DWC2_HC_XFER_URB_DEQUEUE) {
/*
* If the channel was halted, this should be the only
* interrupt unmasked
*/
WARN_ON(hcint != HCINTMSK_CHHLTD);
if (hsotg->params.dma_desc_enable)
dwc2_hcd_complete_xfer_ddma(hsotg, chan, chnum,
chan->halt_status);
else
dwc2_release_channel(hsotg, chan, NULL,
chan->halt_status);
return;
}
if (list_empty(&chan->qh->qtd_list)) {
/*
* TODO: Will this ever happen with the
* DWC2_HC_XFER_URB_DEQUEUE handling above?
*/
dev_dbg(hsotg->dev, "## no QTD queued for channel %d ##\n",
chnum);
dev_dbg(hsotg->dev,
" hcint 0x%08x, hcintmsk 0x%08x, hcint&hcintmsk 0x%08x\n",
chan->hcint, hcintmsk, hcint);
chan->halt_status = DWC2_HC_XFER_NO_HALT_STATUS;
disable_hc_int(hsotg, chnum, HCINTMSK_CHHLTD);
chan->hcint = 0;
return;
}
qtd = list_first_entry(&chan->qh->qtd_list, struct dwc2_qtd,
qtd_list_entry);
if (!hsotg->params.host_dma) {
if ((hcint & HCINTMSK_CHHLTD) && hcint != HCINTMSK_CHHLTD)
hcint &= ~HCINTMSK_CHHLTD;
}
if (hcint & HCINTMSK_XFERCOMPL) {
dwc2_hc_xfercomp_intr(hsotg, chan, chnum, qtd);
/*
* If NYET occurred at same time as Xfer Complete, the NYET is
* handled by the Xfer Complete interrupt handler. Don't want
* to call the NYET interrupt handler in this case.
*/
hcint &= ~HCINTMSK_NYET;
}
if (hcint & HCINTMSK_CHHLTD) {
dwc2_hc_chhltd_intr(hsotg, chan, chnum, qtd);
if (!dwc2_check_qtd_still_ok(qtd, chan->qh))
goto exit;
}
if (hcint & HCINTMSK_AHBERR) {
dwc2_hc_ahberr_intr(hsotg, chan, chnum, qtd);
if (!dwc2_check_qtd_still_ok(qtd, chan->qh))
goto exit;
}
if (hcint & HCINTMSK_STALL) {
dwc2_hc_stall_intr(hsotg, chan, chnum, qtd);
if (!dwc2_check_qtd_still_ok(qtd, chan->qh))
goto exit;
}
if (hcint & HCINTMSK_NAK) {
dwc2_hc_nak_intr(hsotg, chan, chnum, qtd);
if (!dwc2_check_qtd_still_ok(qtd, chan->qh))
goto exit;
}
if (hcint & HCINTMSK_ACK) {
dwc2_hc_ack_intr(hsotg, chan, chnum, qtd);
if (!dwc2_check_qtd_still_ok(qtd, chan->qh))
goto exit;
}
if (hcint & HCINTMSK_NYET) {
dwc2_hc_nyet_intr(hsotg, chan, chnum, qtd);
if (!dwc2_check_qtd_still_ok(qtd, chan->qh))
goto exit;
}
if (hcint & HCINTMSK_XACTERR) {
dwc2_hc_xacterr_intr(hsotg, chan, chnum, qtd);
if (!dwc2_check_qtd_still_ok(qtd, chan->qh))
goto exit;
}
if (hcint & HCINTMSK_BBLERR) {
dwc2_hc_babble_intr(hsotg, chan, chnum, qtd);
if (!dwc2_check_qtd_still_ok(qtd, chan->qh))
goto exit;
}
if (hcint & HCINTMSK_FRMOVRUN) {
dwc2_hc_frmovrun_intr(hsotg, chan, chnum, qtd);
if (!dwc2_check_qtd_still_ok(qtd, chan->qh))
goto exit;
}
if (hcint & HCINTMSK_DATATGLERR) {
dwc2_hc_datatglerr_intr(hsotg, chan, chnum, qtd);
if (!dwc2_check_qtd_still_ok(qtd, chan->qh))
goto exit;
}
exit:
chan->hcint = 0;
}
/*
* This interrupt indicates that one or more host channels has a pending
* interrupt. There are multiple conditions that can cause each host channel
* interrupt. This function determines which conditions have occurred for each
* host channel interrupt and handles them appropriately.
*/
static void dwc2_hc_intr(struct dwc2_hsotg *hsotg)
{
u32 haint;
int i;
struct dwc2_host_chan *chan, *chan_tmp;
haint = dwc2_readl(hsotg, 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;
}