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kernel / pub / scm / linux / kernel / git / jhogan / metag-legacy / f41e0d92a683a20eaa0ff80dbd45b0b362fa1fb6 / . / drivers / usb / dwc_otg / dwc_otg_hcd_intr.c
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/* ==========================================================================
*
* Synopsys HS OTG Linux Software Driver and documentation (hereinafter,
* "Software") is an Unsupported proprietary work of Synopsys, Inc. unless
* otherwise expressly agreed to in writing between Synopsys and you.
*
* The Software IS NOT an item of Licensed Software or Licensed Product under
* any End User Software License Agreement or Agreement for Licensed Product
* with Synopsys or any supplement thereto. You are permitted to use and
* redistribute this Software in source and binary forms, with or without
* modification, provided that redistributions of source code must retain this
* notice. You may not view, use, disclose, copy or distribute this file or
* any information contained herein except pursuant to this license grant from
* Synopsys. If you do not agree with this notice, including the disclaimer
* below, then you are not authorized to use the Software.
*
* THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS" BASIS
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
* ========================================================================== */
#ifndef DWC_DEVICE_ONLY
#include <linux/moduleparam.h>
#include "dwc_otg_driver.h"
#include "dwc_otg_hcd.h"
#include "dwc_otg_regs.h"
static const int deferral_on = 1;
static int nak_deferral_delay = 20;
module_param(nak_deferral_delay, int, 0644);
static const int nyet_deferral_delay = 1;
static const int LOCKED = 1;
/** @file
* This file contains the implementation of the HCD Interrupt handlers.
*/
/** This function handles interrupts for the HCD. */
int dwc_otg_hcd_handle_intr(struct dwc_otg_hcd *dwc_otg_hcd)
{
int retval = 0;
struct dwc_otg_core_if *core_if = dwc_otg_hcd->core_if;
union gintsts_data gintsts;
#ifdef DEBUG
struct dwc_otg_core_global_regs __iomem *global_regs =
core_if->core_global_regs;
#endif /* */
/* Check if HOST Mode */
if (dwc_otg_is_host_mode(core_if)) {
gintsts.d32 = dwc_otg_read_core_intr(core_if);
if (!gintsts.d32)
return 0;
#ifdef DEBUG
/* Don't print debug message in the interrupt handler on SOF */
#ifndef DEBUG_SOF
if (gintsts.d32 != DWC_SOF_INTR_MASK)
#endif
DWC_DEBUGPL(DBG_HCD, "\n");
#endif /* */
#ifdef DEBUG
#ifndef DEBUG_SOF
if (gintsts.d32 != DWC_SOF_INTR_MASK)
#endif
DWC_DEBUGPL(DBG_HCD, "DWC OTG HCD Interrupt Detected "
"gintsts&gintmsk=0x%08x\n",
gintsts.d32);
#endif /* */
if (gintsts.b.sofintr)
retval |= dwc_otg_hcd_handle_sof_intr(dwc_otg_hcd);
#ifdef OTG_PLB_DMA_TASKLET
if (!atomic_read(&release_later) && gintsts.b.rxstsqlvl)
#else
if (gintsts.b.rxstsqlvl)
#endif
retval |= dwc_otg_hcd_handle_rx_status_q_level_intr(
dwc_otg_hcd);
#ifdef OTG_PLB_DMA_TASKLET
if (!atomic_read(&release_later) && gintsts.b.nptxfempty)
#else
if (gintsts.b.nptxfempty)
#endif
retval |= dwc_otg_hcd_handle_np_tx_fifo_empty_intr(
dwc_otg_hcd);
#if 0
if (gintsts.b.i2cintr)
;
/** @todo Implement i2cintr handler. */
#endif
if (gintsts.b.portintr)
retval |= dwc_otg_hcd_handle_port_intr(dwc_otg_hcd);
if (gintsts.b.hcintr)
retval |= dwc_otg_hcd_handle_hc_intr(dwc_otg_hcd);
if (gintsts.b.ptxfempty)
retval |= dwc_otg_hcd_handle_perio_tx_fifo_empty_intr(
dwc_otg_hcd);
#ifdef DEBUG
#ifndef DEBUG_SOF
if (gintsts.d32 != DWC_SOF_INTR_MASK) {
#endif
DWC_DEBUGPL(DBG_HCD,
"DWC OTG HCD Finished "
"Servicing Interrupts\n");
DWC_DEBUGPL(DBG_HCDV, "DWC OTG HCD gintsts=0x%08x\n",
dwc_read_reg32(&global_regs->gintsts));
DWC_DEBUGPL(DBG_HCDV, "DWC OTG HCD gintmsk=0x%08x\n",
dwc_read_reg32(&global_regs->gintmsk));
#ifndef DEBUG_SOF
}
if (gintsts.d32 != DWC_SOF_INTR_MASK)
#endif
DWC_DEBUGPL(DBG_HCD, "\n");
#endif
}
return retval;
}
#ifdef DWC_TRACK_MISSED_SOFS
#warning Compiling code to track missed SOFs
#define FRAME_NUM_ARRAY_SIZE 1000
/**
* This function is for debug only.
*/
static inline void track_missed_sofs(u16 curr_frame_number)
{
static u16 frame_num_array[FRAME_NUM_ARRAY_SIZE];
static u16 last_frame_num_array[FRAME_NUM_ARRAY_SIZE];
static int frame_num_idx;
static u16 last_frame_num = DWC_HFNUM_MAX_FRNUM;
static int dumped_frame_num_array;
if (frame_num_idx < FRAME_NUM_ARRAY_SIZE) {
if ((((last_frame_num + 1) & DWC_HFNUM_MAX_FRNUM) !=
curr_frame_number)) {
frame_num_array[frame_num_idx] = curr_frame_number;
last_frame_num_array[frame_num_idx++] = last_frame_num;
}
} else if (!dumped_frame_num_array) {
int i;
printk(KERN_EMERG USB_DWC "Frame Last Frame\n");
printk(KERN_EMERG USB_DWC "----- ----------\n");
for (i = 0; i < FRAME_NUM_ARRAY_SIZE; i++) {
printk(KERN_EMERG USB_DWC "0x%04x 0x%04x\n",
frame_num_array[i], last_frame_num_array[i]);
}
dumped_frame_num_array = 1;
}
last_frame_num = curr_frame_number;
}
#endif
/**
* 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.
*/
int dwc_otg_hcd_handle_sof_intr(struct dwc_otg_hcd *hcd)
{
union hfnum_data hfnum;
struct list_head *qh_entry;
struct dwc_otg_qh *qh;
enum dwc_otg_transaction_type tr_type;
union gintsts_data gintsts = {.d32 = 0};
hfnum.d32 =
dwc_read_reg32(&hcd->core_if->host_if->host_global_regs->hfnum);
#ifdef DEBUG_SOF
DWC_DEBUGPL(DBG_HCD, "--Start of Frame Interrupt--\n");
#endif /* */
hcd->frame_number = hfnum.b.frnum;
#ifdef DEBUG
hcd->frrem_accum += hfnum.b.frrem;
hcd->frrem_samples++;
#endif /* */
#ifdef DWC_TRACK_MISSED_SOFS
track_missed_sofs(hcd->frame_number);
#endif
/* Determine whether any periodic QHs should be executed. */
qh_entry = hcd->periodic_sched_inactive.next;
while (qh_entry != &hcd->periodic_sched_inactive) {
qh = list_entry(qh_entry, struct dwc_otg_qh, qh_list_entry);
qh_entry = qh_entry->next;
if (dwc_frame_num_le(qh->sched_frame, hcd->frame_number)) {
/*
* Move QH to the ready list to be executed next
* (micro)frame.
*/
list_move(&qh->qh_list_entry,
&hcd->periodic_sched_ready);
}
}
tr_type = __dwc_otg_hcd_select_transactions(hcd, LOCKED);
if (tr_type != DWC_OTG_TRANSACTION_NONE)
dwc_otg_hcd_queue_transactions(hcd, tr_type);
/* Clear interrupt */
gintsts.b.sofintr = 1;
dwc_write_reg32(&hcd->core_if->core_global_regs->gintsts, gintsts.d32);
return 1;
}
/* Handles the Rx Status Queue 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.
*/
int dwc_otg_hcd_handle_rx_status_q_level_intr(struct dwc_otg_hcd *dwc_otg_hcd)
{
union host_grxsts_data grxsts;
struct dwc_hc *hc = NULL;
DWC_DEBUGPL(DBG_HCD, "--RxStsQ Level Interrupt--\n");
grxsts.d32 =
dwc_read_reg32(&dwc_otg_hcd->core_if->core_global_regs->grxstsp);
hc = dwc_otg_hcd->hc_ptr_array[grxsts.b.chnum];
if (hc) {
/* Packet Status */
DWC_DEBUGPL(DBG_HCDV, " Ch num = %d\n", grxsts.b.chnum);
DWC_DEBUGPL(DBG_HCDV, " Count = %d\n", grxsts.b.bcnt);
DWC_DEBUGPL(DBG_HCDV, " DPID = %d, hc.dpid = %d\n",
grxsts.b.dpid, hc->data_pid_start);
DWC_DEBUGPL(DBG_HCDV, " PStatus = %d\n", grxsts.b.pktsts);
switch (grxsts.b.pktsts) {
case DWC_GRXSTS_PKTSTS_IN:
/* Read the data into the host buffer. */
if (grxsts.b.bcnt > 0 && hc->xfer_buff) {
dwc_otg_read_packet(dwc_otg_hcd->core_if,
hc->xfer_buff, grxsts.b.bcnt);
/*
* Update the HC fields for the
* next packet received.
*/
hc->xfer_count += grxsts.b.bcnt;
hc->xfer_buff += grxsts.b.bcnt;
}
case DWC_GRXSTS_PKTSTS_IN_XFER_COMP:
case DWC_GRXSTS_PKTSTS_DATA_TOGGLE_ERR:
case DWC_GRXSTS_PKTSTS_CH_HALTED:
/* Handled in interrupt, just ignore data */
break;
default:
DWC_ERROR("RX_STS_Q Interrupt: Unknown status %d\n",
grxsts.b.pktsts);
break;
}
return 1;
}
return -1;
}
/** 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. */
int dwc_otg_hcd_handle_np_tx_fifo_empty_intr(struct dwc_otg_hcd *dwc_otg_hcd)
{
DWC_DEBUGPL(DBG_HCD, "--Non-Periodic TxFIFO Empty Interrupt--\n");
dwc_otg_hcd_queue_transactions(dwc_otg_hcd,
DWC_OTG_TRANSACTION_NON_PERIODIC);
return 1;
}
/** 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. */
int dwc_otg_hcd_handle_perio_tx_fifo_empty_intr(struct dwc_otg_hcd *dwc_otg_hcd)
{
DWC_DEBUGPL(DBG_HCD, "--Periodic TxFIFO Empty Interrupt--\n");
dwc_otg_hcd_queue_transactions(dwc_otg_hcd,
DWC_OTG_TRANSACTION_PERIODIC);
return 1;
}
static void dwc_otg_handle_port_change(struct dwc_otg_hcd *dwc_otg_hcd,
union hprt0_data *hprt0)
{
int do_reset = 0;
struct dwc_otg_core_params *params =
dwc_otg_hcd->core_if->core_params;
struct dwc_otg_core_global_regs __iomem *global_regs =
dwc_otg_hcd->core_if->core_global_regs;
struct dwc_otg_host_if *host_if =
dwc_otg_hcd->core_if->host_if;
/* Check if we need to adjust the PHY clock speed for
* low power and adjust it */
if (params->host_support_fs_ls_low_power) {
union gusbcfg_data usbcfg;
usbcfg.d32 = dwc_read_reg32(&global_regs->gusbcfg);
if ((hprt0->b.prtspd == DWC_HPRT0_PRTSPD_LOW_SPEED) ||
(hprt0->b.prtspd == DWC_HPRT0_PRTSPD_FULL_SPEED)) {
/*
* Low power
*/
union hcfg_data hcfg;
if (usbcfg.b.phylpwrclksel == 0) {
/*
* Set PHY low power clock select
* for FS/LS devices
*/
usbcfg.b.phylpwrclksel = 1;
dwc_write_reg32(
&global_regs->gusbcfg, usbcfg.d32);
do_reset = 1;
}
hcfg.d32 =
dwc_read_reg32(&host_if->host_global_regs->hcfg);
if ((hprt0->b.prtspd == DWC_HPRT0_PRTSPD_LOW_SPEED) &&
(params->host_ls_low_power_phy_clk ==
DWC_HOST_LS_LOW_POWER_PHY_CLK_PARAM_6MHZ)) {
/* 6 MHZ */
DWC_DEBUGPL(DBG_CIL, "FS_PHY programming HCFG "
"to 6 MHz (Low Power)\n");
if (hcfg.b.fslspclksel != DWC_HCFG_6_MHZ) {
hcfg.b.fslspclksel = DWC_HCFG_6_MHZ;
dwc_write_reg32(
&host_if->host_global_regs->hcfg
, hcfg.d32
);
do_reset = 1;
}
} else {
/* 48 MHZ */
DWC_DEBUGPL(DBG_CIL, "FS_PHY programming "
"HCFG to 48 MHz ()\n");
if (hcfg.b.fslspclksel != DWC_HCFG_48_MHZ) {
hcfg.b.fslspclksel = DWC_HCFG_48_MHZ;
dwc_write_reg32(
&host_if->host_global_regs->hcfg
, hcfg.d32
);
do_reset = 1;
}
}
} else {
/*
* Not low power
*/
if (usbcfg.b.phylpwrclksel == 1) {
usbcfg.b.phylpwrclksel = 0;
dwc_write_reg32(&global_regs->gusbcfg,
usbcfg.d32);
do_reset = 1;
}
}
if (do_reset)
tasklet_schedule(dwc_otg_hcd->reset_tasklet);
}
if (!do_reset) {
/* Port has been enabled set the reset change flag */
dwc_otg_hcd->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. */
int dwc_otg_hcd_handle_port_intr(struct dwc_otg_hcd *dwc_otg_hcd)
{
int retval = 0;
union hprt0_data hprt0;
union hprt0_data hprt0_modify;
hprt0.d32 = dwc_read_reg32(dwc_otg_hcd->core_if->host_if->hprt0);
hprt0_modify.d32 = dwc_read_reg32(dwc_otg_hcd->core_if->host_if->hprt0);
/*
* Clear appropriate bits in HPRT0 to clear the interrupt bit in
* GINTSTS
*/
hprt0_modify.b.prtena = 0;
hprt0_modify.b.prtconndet = 0;
hprt0_modify.b.prtenchng = 0;
hprt0_modify.b.prtovrcurrchng = 0;
/* Port Connect Detected
* Set flag and clear if detected */
if (hprt0.b.prtconndet) {
DWC_DEBUGPL(DBG_HCD, "--Port Interrupt HPRT0=0x%08x "
"Port Connect Detected--\n", hprt0.d32);
dwc_otg_hcd->flags.b.port_connect_status_change = 1;
dwc_otg_hcd->flags.b.port_connect_status = 1;
hprt0_modify.b.prtconndet = 1;
/* B-Device has connected, Delete the connection timer. */
del_timer(&dwc_otg_hcd->conn_timer);
/* The Hub driver asserts a reset when it sees port connect
* status change flag
*/
retval |= 1;
}
/*
* Port Enable Changed
* Clear if detected - Set internal flag if disabled
*/
if (hprt0.b.prtenchng) {
DWC_DEBUGPL(DBG_HCD, " --Port Interrupt HPRT0=0x%08x "
"Port Enable Changed--\n", hprt0.d32);
hprt0_modify.b.prtenchng = 1;
if (hprt0.b.prtena == 1)
dwc_otg_handle_port_change(dwc_otg_hcd, &hprt0);
else
dwc_otg_hcd->flags.b.port_enable_change = 1;
retval |= 1;
}
/** Overcurrent Change Interrupt */
if (hprt0.b.prtovrcurrchng) {
DWC_DEBUGPL(DBG_HCD, " --Port Interrupt HPRT0=0x%08x "
"Port Overcurrent Changed--\n", hprt0.d32);
dwc_otg_hcd->flags.b.port_over_current_change = 1;
hprt0_modify.b.prtovrcurrchng = 1;
retval |= 1;
}
/* Clear Port Interrupts */
dwc_write_reg32(dwc_otg_hcd->core_if->host_if->hprt0, hprt0_modify.d32);
return retval;
}
/** 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. */
int dwc_otg_hcd_handle_hc_intr(struct dwc_otg_hcd *dwc_otg_hcd)
{
int i;
int retval = 0;
union haint_data haint;
/* Clear appropriate bits in HCINTn to clear the interrupt bit in
* GINTSTS */
haint.d32 = dwc_otg_read_host_all_channels_intr(dwc_otg_hcd->core_if);
for (i = 0; i < dwc_otg_hcd->core_if->core_params->host_channels; i++) {
if (haint.b2.chint & (1 << i))
retval |= dwc_otg_hcd_handle_hc_n_intr(dwc_otg_hcd, i);
}
return retval;
}
/**
* 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 DWC_OTG_HC_XFER_COMPLETE,
* *short_read is set to 1 upon return if less than the requested
* number of bytes were transferred. Otherwise, *short_read is set to 0 upon
* return. short_read may also be NULL on entry, in which case it remains
* unchanged.
*/
static u32 get_actual_xfer_length(struct dwc_hc *hc,
struct dwc_otg_hc_regs __iomem *hc_regs,
struct dwc_otg_qtd *qtd,
enum dwc_otg_halt_status halt_status,
int *short_read)
{
union hctsiz_data hctsiz;
u32 length;
if (short_read != NULL)
*short_read = 0;
hctsiz.d32 = dwc_read_reg32(&hc_regs->hctsiz);
if (halt_status == DWC_OTG_HC_XFER_COMPLETE) {
if (hc->ep_is_in) {
length = hc->xfer_len - hctsiz.b.xfersize;
if (short_read != NULL)
*short_read = (hctsiz.b.xfersize != 0);
} else if (hc->qh->do_split)
length = qtd->ssplit_out_xfer_count;
else
length = hc->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).
*/
length = (hc->start_pkt_count - hctsiz.b.pktcnt) * hc->max_packet;
}
return length;
}
/**
* 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.
*
* @return 1 if the data transfer specified by the URB is completely finished,
* 0 otherwise.
*/
static int update_urb_state_xfer_comp(struct dwc_hc *hc,
struct dwc_otg_hc_regs __iomem *hc_regs,
struct urb *urb,
struct dwc_otg_qtd *qtd, int *status)
{
int xfer_done = 0;
int short_read = 0;
int xfer_length;
xfer_length = get_actual_xfer_length(hc, hc_regs, qtd,
DWC_OTG_HC_XFER_COMPLETE,
&short_read);
/* non DWORD-aligned buffer case handling. */
if (hc->align_buff && xfer_length && hc->ep_is_in) {
memcpy(urb->transfer_buffer + urb->actual_length,
hc->qh->dw_align_buf, xfer_length);
}
urb->actual_length += xfer_length;
if (xfer_length && (hc->ep_type == USB_ENDPOINT_XFER_BULK)
&& (urb->transfer_flags & URB_ZERO_PACKET)
&& (urb->actual_length == urb->transfer_buffer_length)
&& !(urb->transfer_buffer_length % hc->max_packet)) {
xfer_done = 0;
} else if (short_read ||
urb->actual_length == urb->transfer_buffer_length) {
xfer_done = 1;
if (short_read && (urb->transfer_flags & URB_SHORT_NOT_OK))
*status = -EREMOTEIO;
else
*status = 0;
}
#ifdef DEBUG
{
union hctsiz_data hctsiz;
hctsiz.d32 = dwc_read_reg32(&hc_regs->hctsiz);
DWC_DEBUGPL(DBG_HCDV, "DWC_otg: %s: %s, channel %d\n",
__func__, (hc->ep_is_in ? "IN" : "OUT"),
hc->hc_num);
DWC_DEBUGPL(DBG_HCDV, " hc->xfer_len %d\n", hc->xfer_len);
DWC_DEBUGPL(DBG_HCDV, " hctsiz.xfersize %d\n",
hctsiz.b.xfersize);
DWC_DEBUGPL(DBG_HCDV, " urb->transfer_buffer_length %d\n",
urb->transfer_buffer_length);
DWC_DEBUGPL(DBG_HCDV, " urb->actual_length %d\n",
urb->actual_length);
DWC_DEBUGPL(DBG_HCDV, " short_read %d, xfer_done %d\n",
short_read, xfer_done);
}
#endif
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 dwc_otg_hcd_save_data_toggle(struct dwc_hc *hc,
struct dwc_otg_hc_regs __iomem *hc_regs, struct dwc_otg_qtd *qtd)
{
union hctsiz_data hctsiz;
hctsiz.d32 = dwc_read_reg32(&hc_regs->hctsiz);
if (hc->ep_type != USB_ENDPOINT_XFER_CONTROL) {
struct dwc_otg_qh *qh = hc->qh;
if (hctsiz.b.pid == DWC_HCTSIZ_DATA0)
qh->data_toggle = DWC_OTG_HC_PID_DATA0;
else
qh->data_toggle = DWC_OTG_HC_PID_DATA1;
} else {
if (hctsiz.b.pid == DWC_HCTSIZ_DATA0)
qtd->data_toggle = DWC_OTG_HC_PID_DATA0;
else
qtd->data_toggle = DWC_OTG_HC_PID_DATA1;
}
}
/**
* 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.
*
* @return DWC_OTG_HC_XFER_COMPLETE if there are more frames remaining to be
* transferred in the URB. Otherwise return DWC_OTG_HC_XFER_URB_COMPLETE.
*/
static enum dwc_otg_halt_status update_isoc_urb_state(struct dwc_otg_hcd *hcd,
struct dwc_hc *hc, struct dwc_otg_hc_regs __iomem *hc_regs,
struct dwc_otg_qtd *qtd, enum dwc_otg_halt_status halt_status)
{
struct urb *urb = qtd->urb;
enum dwc_otg_halt_status ret_val = halt_status;
struct usb_iso_packet_descriptor *frame_desc;
frame_desc = &urb->iso_frame_desc[qtd->isoc_frame_index];
switch (halt_status) {
case DWC_OTG_HC_XFER_COMPLETE:
frame_desc->status = 0;
frame_desc->actual_length =
get_actual_xfer_length(hc,
hc_regs,
qtd,
halt_status,
NULL);
/* non DWORD-aligned buffer case handling. */
if (hc->align_buff &&
frame_desc->actual_length && hc->ep_is_in) {
memcpy(urb->transfer_buffer +
frame_desc->offset +
qtd->isoc_split_offset,
hc->qh->dw_align_buf,
frame_desc->actual_length);
}
break;
case DWC_OTG_HC_XFER_FRAME_OVERRUN:
urb->error_count++;
if (hc->ep_is_in)
frame_desc->status = -ENOSR;
else
frame_desc->status = -ECOMM;
frame_desc->actual_length = 0;
break;
case DWC_OTG_HC_XFER_BABBLE_ERR:
urb->error_count++;
frame_desc->status = -EOVERFLOW;
/* Don't need to update actual_length in this case. */
break;
case DWC_OTG_HC_XFER_XACT_ERR:
urb->error_count++;
frame_desc->status = -EPROTO;
frame_desc->actual_length =
get_actual_xfer_length(hc, hc_regs, qtd, halt_status, NULL);
/* non DWORD-aligned buffer case handling. */
if (hc->align_buff &&
frame_desc->actual_length && hc->ep_is_in) {
memcpy(urb->transfer_buffer +
frame_desc->offset +
qtd->isoc_split_offset,
hc->qh->dw_align_buf,
frame_desc->actual_length);
}
/* Skip whole frame */
if (hc->qh->do_split && (hc->ep_type == USB_ENDPOINT_XFER_ISOC) &&
hc->ep_is_in && hcd->core_if->dma_enable) {
qtd->complete_split = 0;
qtd->isoc_split_offset = 0;
}
break;
default:
DWC_ERROR("%s: Unhandled halt_status (%d)\n",
__func__, halt_status);
BUG();
break;
}
if (++qtd->isoc_frame_index == urb->number_of_packets) {
/*
* urb->status is not used for isoc transfers.
* The individual frame_desc statuses are used instead.
*/
dwc_otg_hcd_complete_urb(hcd, urb, 0);
ret_val = DWC_OTG_HC_XFER_URB_COMPLETE;
} else
ret_val = DWC_OTG_HC_XFER_COMPLETE;
return ret_val;
}
/**
* 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 deactivate_qh(struct dwc_otg_hcd *hcd,
struct dwc_otg_qh *qh, int free_qtd)
{
int continue_split = 0;
struct dwc_otg_qtd *qtd;
DWC_DEBUGPL(DBG_HCDV, " %s(%p,%p,%d)\n", __func__, hcd, qh,
free_qtd);
qtd = list_entry(qh->qtd_list.next, struct dwc_otg_qtd, qtd_list_entry);
if (qtd->complete_split)
continue_split = 1;
else if ((qtd->isoc_split_pos == DWC_HCSPLIT_XACTPOS_MID) ||
(qtd->isoc_split_pos == DWC_HCSPLIT_XACTPOS_END))
continue_split = 1;
/*
* All calls come through dwc_otg_hcd_handle_hc_n_intr which takes the
* hcd lock, therefore we use the unlocked internal versions of
* qtd_remove and qh_deactivate to avoid recursive locking.
*/
if (free_qtd) {
/*
* Note that this was previously a call to
* dwc_otg_hcd_qtd_remove_and_free(qtd), which frees the qtd.
* However, that call frees the qtd memory, and we continue in
* the interrupt logic to access it many more times, including
* writing to it. With slub debugging on, it is clear that we
* were writing to memory we had freed.
* Call this instead, and now I have moved the freeing of the
* memory to the end of processing this interrupt.
*/
__dwc_otg_hcd_qtd_remove(hcd, qtd, qh);
continue_split = 0;
}
qh->channel = NULL;
qh->qtd_in_process = NULL;
__dwc_otg_hcd_qh_deactivate(hcd, qh, continue_split);
}
/**
* Releases a host channel for use by other transfers. Attempts to select and
* queue more transactions since at least one host channel is available.
*
* @param hcd The HCD state structure.
* @param hc The host channel to release.
* @param qtd The QTD associated with the host channel. This QTD may be freed
* if the transfer is complete or an error has occurred.
* @param halt_status Reason the channel is being released. This status
* determines the actions taken by this function.
*/
static void release_channel(struct dwc_otg_hcd *hcd,
struct dwc_hc *hc, struct dwc_otg_qtd *qtd,
enum dwc_otg_halt_status halt_status, int *must_free) {
enum dwc_otg_transaction_type tr_type;
int free_qtd;
struct dwc_otg_qh *qh;
int deact = 1;
int retry_delay = 1;
WARN_ON(!in_interrupt());
DWC_DEBUGPL(DBG_HCDV, " %s: channel %d, halt_status %d\n", __func__,
hc->hc_num, halt_status);
switch (halt_status) {
case DWC_OTG_HC_XFER_NYET:
case DWC_OTG_HC_XFER_NAK:
if (halt_status == DWC_OTG_HC_XFER_NYET)
retry_delay = nyet_deferral_delay;
else
retry_delay = nak_deferral_delay;
free_qtd = 0;
if (deferral_on && hc->do_split) {
qh = hc->qh;
if (qh)
deact = dwc_otg_hcd_qh_deferr(hcd,
qh, retry_delay);
}
break;
case DWC_OTG_HC_XFER_URB_COMPLETE:
free_qtd = 1;
break;
case DWC_OTG_HC_XFER_AHB_ERR:
case DWC_OTG_HC_XFER_STALL:
case DWC_OTG_HC_XFER_BABBLE_ERR:
free_qtd = 1;
break;
case DWC_OTG_HC_XFER_XACT_ERR:
if (qtd->error_count >= 3) {
DWC_DEBUGPL(DBG_HCDV, " Complete URB with "
"transaction error\n");
free_qtd = 1;
dwc_otg_hcd_complete_urb(hcd, qtd->urb, -EPROTO);
} else
free_qtd = 0;
break;
case DWC_OTG_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 DWC_OTG_HC_XFER_NO_HALT_STATUS:
DWC_ERROR("%s: No halt_status, channel %d\n", __func__,
hc->hc_num);
free_qtd = 0;
break;
default:
free_qtd = 0;
break;
}
*must_free = free_qtd;
if (deact)
deactivate_qh(hcd, hc->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.
*/
dwc_otg_hc_cleanup(hcd->core_if, hc);
list_add_tail(&hc->hc_list_entry, &hcd->free_hc_list);
switch (hc->ep_type) {
case USB_ENDPOINT_XFER_CONTROL:
case USB_ENDPOINT_XFER_BULK:
hcd->non_periodic_channels--;
if (dwc_otg_hcd_idle(hcd))
wake_up_interruptible(&hcd->idleq);
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;
}
/* Try to queue more transfers now that there's a free channel */
tr_type = __dwc_otg_hcd_select_transactions(hcd, LOCKED);
if (tr_type != DWC_OTG_TRANSACTION_NONE)
dwc_otg_hcd_queue_transactions(hcd, 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 halt_channel(struct dwc_otg_hcd *hcd, struct dwc_hc *hc,
struct dwc_otg_qtd *qtd, enum dwc_otg_halt_status halt_status,
int *must_free)
{
if (hcd->core_if->dma_enable) {
release_channel(hcd, hc, qtd, halt_status, must_free);
return;
}
/* Slave mode processing... */
dwc_otg_hc_halt(hcd->core_if, hc, halt_status);
if (hc->halt_on_queue) {
union gintmsk_data gintmsk = {.d32 = 0};
struct dwc_otg_core_global_regs __iomem *global_regs;
global_regs = hcd->core_if->core_global_regs;
if (hc->ep_type == USB_ENDPOINT_XFER_CONTROL ||
hc->ep_type == USB_ENDPOINT_XFER_BULK) {
/*
* Make sure the Non-periodic Tx FIFO empty interrupt
* is enabled so that the non-periodic schedule will
* be processed.
*/
gintmsk.b.nptxfempty = 1;
dwc_modify_reg32(&global_regs->gintmsk, 0, gintmsk.d32);
} else {
/*
* 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(&hc->qh->qh_list_entry,
&hcd->periodic_sched_assigned);
/*
* Make sure the Periodic Tx FIFO Empty interrupt is
* enabled so that the periodic schedule will be
* processed.
*/
gintmsk.b.ptxfempty = 1;
dwc_modify_reg32(&global_regs->gintmsk, 0, gintmsk.d32);
}
}
}
/**
* 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 complete_non_periodic_xfer(struct dwc_otg_hcd *hcd,
struct dwc_hc *hc, struct dwc_otg_hc_regs __iomem *hc_regs,
struct dwc_otg_qtd *qtd, enum dwc_otg_halt_status halt_status,
int *must_free)
{
union hcint_data hcint;
qtd->error_count = 0;
hcint.d32 = dwc_read_reg32(&hc_regs->hcint);
if (hcint.b.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.
*/
hc->qh->ping_state = 1;
clear_hc_int(hc_regs, nyet);
}
/*
* 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 dwc_otg_hcd_queue_transactions, which also enables the
* Tx FIFO Empty interrupt if necessary.
*/
if (hc->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.)
*/
halt_channel(hcd, hc, qtd, halt_status, must_free);
} else {
/*
* The channel is automatically disabled by the core for OUT
* transfers in Slave mode.
*/
release_channel(hcd, hc, qtd, halt_status, must_free);
}
}
/**
* 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 complete_periodic_xfer(struct dwc_otg_hcd *hcd,
struct dwc_hc *hc, struct dwc_otg_hc_regs __iomem *hc_regs,
struct dwc_otg_qtd *qtd, enum dwc_otg_halt_status halt_status,
int *must_free)
{
union hctsiz_data hctsiz;
qtd->error_count = 0;
hctsiz.d32 = dwc_read_reg32(&hc_regs->hctsiz);
if (!hc->ep_is_in || hctsiz.b.pktcnt == 0)
/* Core halts channel in these cases. */
release_channel(hcd, hc, qtd, halt_status, must_free);
else
/* Flush any outstanding requests from the Tx queue. */
halt_channel(hcd, hc, qtd, halt_status, must_free);
}
static int handle_xfercomp_isoc_split_in(
struct dwc_otg_hcd *hcd,
struct dwc_hc *hc,
struct dwc_otg_hc_regs __iomem *hc_regs,
struct dwc_otg_qtd *qtd,
int *must_free)
{
u32 len;
struct usb_iso_packet_descriptor *frame_desc;
frame_desc = &qtd->urb->iso_frame_desc[qtd->isoc_frame_index];
len = get_actual_xfer_length(hc, hc_regs, qtd,
DWC_OTG_HC_XFER_COMPLETE,
NULL);
if (!len) {
qtd->complete_split = 0;
qtd->isoc_split_offset = 0;
return 0;
}
frame_desc->actual_length += len;
if (hc->align_buff && len)
memcpy(qtd->urb->transfer_buffer + frame_desc->offset +
qtd->isoc_split_offset,
hc->qh->dw_align_buf,
len);
qtd->isoc_split_offset += len;
if (frame_desc->length == frame_desc->actual_length) {
frame_desc->status = 0;
qtd->isoc_frame_index++;
qtd->complete_split = 0;
qtd->isoc_split_offset = 0;
}
if (qtd->isoc_frame_index == qtd->urb->number_of_packets) {
dwc_otg_hcd_complete_urb(hcd, qtd->urb, 0);
release_channel(hcd, hc, qtd, DWC_OTG_HC_XFER_URB_COMPLETE,
must_free);
} else
release_channel(hcd, hc, qtd, DWC_OTG_HC_XFER_NO_HALT_STATUS,
must_free);
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 int handle_hc_xfercomp_intr(struct dwc_otg_hcd *hcd,
struct dwc_hc *hc, struct dwc_otg_hc_regs __iomem *hc_regs,
struct dwc_otg_qtd *qtd, int *must_free)
{
int urb_xfer_done;
enum dwc_otg_halt_status halt_status = DWC_OTG_HC_XFER_COMPLETE;
struct urb *urb = qtd->urb;
int pipe_type = usb_pipetype(urb->pipe);
int status = -EINPROGRESS;
DWC_DEBUGPL(DBG_HCD, "--Host Channel %d Interrupt: "
"Transfer Complete--\n", hc->hc_num);
if (hcd->core_if->dma_desc_enable) {
dwc_otg_hcd_complete_xfer_ddma(hcd, hc, hc_regs, halt_status);
if (pipe_type == PIPE_ISOCHRONOUS) {
/* Do not disable the interrupt, just clear it */
clear_hc_int(hc_regs, xfercomp);
return 1;
}
goto handle_xfercomp_done;
}
/*
* Handle xfer complete on CSPLIT.
*/
if (hc->qh->do_split) {
if ((hc->ep_type == USB_ENDPOINT_XFER_ISOC)
&& hc->ep_is_in && hcd->core_if->dma_enable) {
if (qtd->complete_split &&
handle_xfercomp_isoc_split_in(hcd, hc, hc_regs,
qtd, must_free))
goto handle_xfercomp_done;
} else
qtd->complete_split = 0;
}
/* Update the QTD and URB states. */
switch (pipe_type) {
case PIPE_CONTROL:
switch (qtd->control_phase) {
case DWC_OTG_CONTROL_SETUP:
if (urb->transfer_buffer_length > 0)
qtd->control_phase = DWC_OTG_CONTROL_DATA;
else
qtd->control_phase = DWC_OTG_CONTROL_STATUS;
DWC_DEBUGPL(DBG_HCDV,
" Control setup transaction done\n");
halt_status = DWC_OTG_HC_XFER_COMPLETE;
break;
case DWC_OTG_CONTROL_DATA:
urb_xfer_done = update_urb_state_xfer_comp(hc, hc_regs,
urb, qtd, &status);
if (urb_xfer_done) {
qtd->control_phase = DWC_OTG_CONTROL_STATUS;
DWC_DEBUGPL(DBG_HCDV, " Control data "
"transfer done\n");
} else
dwc_otg_hcd_save_data_toggle(hc, hc_regs, qtd);
halt_status = DWC_OTG_HC_XFER_COMPLETE;
break;
case DWC_OTG_CONTROL_STATUS:
DWC_DEBUGPL(DBG_HCDV, " Control transfer complete\n");
if (status == -EINPROGRESS)
status = 0;
dwc_otg_hcd_complete_urb(hcd, urb, status);
halt_status = DWC_OTG_HC_XFER_URB_COMPLETE;
break;
}
complete_non_periodic_xfer(hcd, hc, hc_regs, qtd,
halt_status, must_free);
break;
case PIPE_BULK:
DWC_DEBUGPL(DBG_HCDV, " Bulk transfer complete\n");
urb_xfer_done = update_urb_state_xfer_comp(hc, hc_regs, urb,
qtd, &status);
if (urb_xfer_done) {
dwc_otg_hcd_complete_urb(hcd, urb, status);
halt_status = DWC_OTG_HC_XFER_URB_COMPLETE;
} else
halt_status = DWC_OTG_HC_XFER_COMPLETE;
dwc_otg_hcd_save_data_toggle(hc, hc_regs, qtd);
complete_non_periodic_xfer(hcd, hc, hc_regs, qtd,
halt_status, must_free);
break;
case PIPE_INTERRUPT:
DWC_DEBUGPL(DBG_HCDV, " Interrupt transfer complete\n");
update_urb_state_xfer_comp(hc, hc_regs, urb, qtd, &status);
/*
* Interrupt URB is done on the first transfer complete
* interrupt.
*/
dwc_otg_hcd_complete_urb(hcd, urb, status);
dwc_otg_hcd_save_data_toggle(hc, hc_regs, qtd);
complete_periodic_xfer(hcd, hc, hc_regs,
qtd, DWC_OTG_HC_XFER_URB_COMPLETE, must_free);
break;
case PIPE_ISOCHRONOUS:
DWC_DEBUGPL(DBG_HCDV, " Isochronous transfer complete\n");
if (qtd->isoc_split_pos == DWC_HCSPLIT_XACTPOS_ALL)
halt_status = update_isoc_urb_state(hcd, hc, hc_regs,
qtd, DWC_OTG_HC_XFER_COMPLETE);
complete_periodic_xfer(hcd, hc, hc_regs, qtd,
halt_status, must_free);
break;
}
handle_xfercomp_done:
disable_hc_int(hc_regs, xfercompl);
return 1;
}
/**
* Handles a host channel STALL interrupt. This handler may be called in
* either DMA mode or Slave mode.
*/
static int handle_hc_stall_intr(struct dwc_otg_hcd *hcd, struct dwc_hc *hc,
struct dwc_otg_hc_regs __iomem *hc_regs,
struct dwc_otg_qtd *qtd, int *must_free)
{
struct urb *urb = qtd->urb;
int pipe_type = usb_pipetype(urb->pipe);
DWC_DEBUGPL(DBG_HCD, "--Host Channel %d Interrupt: "
"STALL Received--\n", hc->hc_num);
if (hcd->core_if->dma_desc_enable) {
dwc_otg_hcd_complete_xfer_ddma(hcd, hc, hc_regs,
DWC_OTG_HC_XFER_STALL);
goto handle_stall_done;
}
if (pipe_type == PIPE_CONTROL)
dwc_otg_hcd_complete_urb(hcd, qtd->urb, -EPIPE);
if (pipe_type == PIPE_BULK || pipe_type == PIPE_INTERRUPT) {
dwc_otg_hcd_complete_urb(hcd, qtd->urb, -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.
*/
hc->qh->data_toggle = 0;
}
halt_channel(hcd, hc, qtd, DWC_OTG_HC_XFER_STALL, must_free);
handle_stall_done:
disable_hc_int(hc_regs, stall);
return 1;
}
/*
* 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 update_urb_state_xfer_intr(struct dwc_hc *hc,
struct dwc_otg_hc_regs __iomem *hc_regs, struct urb *urb,
struct dwc_otg_qtd *qtd, enum dwc_otg_halt_status halt_status)
{
u32 bytes_transferred =
get_actual_xfer_length(hc, hc_regs, qtd, halt_status, NULL);
/* non DWORD-aligned buffer case handling. */
if (hc->align_buff && bytes_transferred && hc->ep_is_in)
memcpy(urb->transfer_buffer + urb->actual_length,
hc->qh->dw_align_buf,
bytes_transferred);
urb->actual_length += bytes_transferred;
#ifdef DEBUG
{
union hctsiz_data hctsiz;
hctsiz.d32 = dwc_read_reg32(&hc_regs->hctsiz);
DWC_DEBUGPL(DBG_HCDV, "DWC_otg: %s: %s, channel %d\n",
__func__, (hc->ep_is_in ? "IN" : "OUT"),
hc->hc_num);
DWC_DEBUGPL(DBG_HCDV, " hc->start_pkt_count %d\n",
hc->start_pkt_count);
DWC_DEBUGPL(DBG_HCDV, " hctsiz.pktcnt %d\n", hctsiz.b.pktcnt);
DWC_DEBUGPL(DBG_HCDV, " hc->max_packet %d\n", hc->max_packet);
DWC_DEBUGPL(DBG_HCDV, " bytes_transferred %d\n",
bytes_transferred);
DWC_DEBUGPL(DBG_HCDV, " urb->actual_length %d\n",
urb->actual_length);
DWC_DEBUGPL(DBG_HCDV, " urb->transfer_buffer_length %d\n",
urb->transfer_buffer_length);
}
#endif
}
/**
* Handles a host channel NAK interrupt. This handler may be called in either
* DMA mode or Slave mode.
*/
static int handle_hc_nak_intr(struct dwc_otg_hcd *hcd, struct dwc_hc *hc,
struct dwc_otg_hc_regs __iomem *hc_regs,
struct dwc_otg_qtd *qtd, int *must_free)
{
DWC_DEBUGPL(DBG_HCD, "--Host Channel %d Interrupt: "
"NAK Received--\n", hc->hc_num);
/*
* Handle NAK for IN/OUT SSPLIT/CSPLIT transfers, bulk, control, and
* interrupt. Re-start the SSPLIT transfer.
*/
if (hc->do_split) {
if (hc->complete_split)
qtd->error_count = 0;
qtd->complete_split = 0;
halt_channel(hcd, hc, qtd, DWC_OTG_HC_XFER_NAK, must_free);
goto handle_nak_done;
}
switch (usb_pipetype(qtd->urb->pipe)) {
case PIPE_CONTROL:
case PIPE_BULK:
if (hcd->core_if->dma_enable && hc->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;
goto handle_nak_done;
}
/*
* 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 (!hc->qh->ping_state) {
update_urb_state_xfer_intr(hc, hc_regs, qtd->urb,
qtd, DWC_OTG_HC_XFER_NAK);
dwc_otg_hcd_save_data_toggle(hc, hc_regs, qtd);
if (qtd->urb->dev->speed == USB_SPEED_HIGH)
hc->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.
*/
halt_channel(hcd, hc, qtd, DWC_OTG_HC_XFER_NAK, must_free);
break;
case PIPE_INTERRUPT:
qtd->error_count = 0;
halt_channel(hcd, hc, qtd, DWC_OTG_HC_XFER_NAK, must_free);
break;
case PIPE_ISOCHRONOUS:
/* Should never get called for isochronous transfers. */
BUG();
break;
}
handle_nak_done:
disable_hc_int(hc_regs, nak);
return 1;
}
/**
* 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 int handle_hc_ack_intr(struct dwc_otg_hcd *hcd,
struct dwc_hc *hc, struct dwc_otg_hc_regs __iomem *hc_regs,
struct dwc_otg_qtd *qtd, int *must_free)
{
DWC_DEBUGPL(DBG_HCD, "--Host Channel %d Interrupt: "
"ACK Received--\n", hc->hc_num);
if (hc->do_split) {
/*
* Handle ACK on SSPLIT.
* ACK should not occur in CSPLIT.
*/
if ((!hc->ep_is_in) &&
(hc->data_pid_start != DWC_OTG_HC_PID_SETUP))
qtd->ssplit_out_xfer_count = hc->xfer_len;
if (!(hc->ep_type == USB_ENDPOINT_XFER_ISOC && !hc->ep_is_in))
/* Don't need complete for isochronous out transfr*/
qtd->complete_split = 1;
/* ISOC OUT */
if ((hc->ep_type == USB_ENDPOINT_XFER_ISOC) && !hc->ep_is_in) {
switch (hc->xact_pos) {
case DWC_HCSPLIT_XACTPOS_ALL:
break;
case DWC_HCSPLIT_XACTPOS_END:
qtd->isoc_split_pos = DWC_HCSPLIT_XACTPOS_ALL;
qtd->isoc_split_offset = 0;
break;
case DWC_HCSPLIT_XACTPOS_BEGIN:
case DWC_HCSPLIT_XACTPOS_MID: {
/*
* For BEGIN or MID, calculate the length for
* the next microframe to determine the correct
* SSPLIT token, either MID or END.
*/
struct usb_iso_packet_descriptor *frame_desc;
frame_desc =
&qtd->urb->iso_frame_desc[qtd->isoc_frame_index];
qtd->isoc_split_offset += 188;
if ((frame_desc->length -
qtd->isoc_split_offset) <= 188)
qtd->isoc_split_pos =
DWC_HCSPLIT_XACTPOS_END;
else
qtd->isoc_split_pos =
DWC_HCSPLIT_XACTPOS_MID;
}
break;
}
} else
halt_channel(hcd, hc, qtd,
DWC_OTG_HC_XFER_ACK, must_free);
} else {
qtd->error_count = 0;
if (hc->qh->ping_state) {
hc->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.
*/
halt_channel(hcd, hc, qtd,
DWC_OTG_HC_XFER_ACK, must_free);
}
}
/*
* If the ACK occurred when _not_ in the PING state, let the channel
* continue transferring data after clearing the error count.
*/
disable_hc_int(hc_regs, ack);
return 1;
}
/**
* 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 int handle_hc_nyet_intr(struct dwc_otg_hcd *hcd,
struct dwc_hc *hc, struct dwc_otg_hc_regs __iomem *hc_regs,
struct dwc_otg_qtd *qtd, int *must_free)
{
DWC_DEBUGPL(DBG_HCD, "--Host Channel %d Interrupt: "
"NYET Received--\n", hc->hc_num);
/*
* NYET on CSPLIT
* re-do the CSPLIT immediately on non-periodic
*/
if (hc->do_split && hc->complete_split) {
if (hc->ep_is_in && (hc->ep_type == USB_ENDPOINT_XFER_ISOC)
&& hcd->core_if->dma_enable) {
qtd->complete_split = 0;
qtd->isoc_split_offset = 0;
if (++qtd->isoc_frame_index ==
qtd->urb->number_of_packets) {
dwc_otg_hcd_complete_urb(hcd, qtd->urb, 0);
release_channel(hcd, hc, qtd,
DWC_OTG_HC_XFER_URB_COMPLETE,
must_free);
} else
release_channel(hcd, hc, qtd,
DWC_OTG_HC_XFER_NO_HALT_STATUS,
must_free);
goto handle_nyet_done;
}
if ((hc->ep_type == USB_ENDPOINT_XFER_INT) ||
(hc->ep_type == USB_ENDPOINT_XFER_ISOC)) {
int frnum =
dwc_otg_hcd_get_frame_number(
dwc_otg_hcd_to_hcd(hcd)
);
if (dwc_full_frame_num(frnum) !=
dwc_full_frame_num(hc->qh->sched_frame)) {
/*
* No longer in the same full speed frame.
* 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;
halt_channel(hcd, hc, qtd,
DWC_OTG_HC_XFER_XACT_ERR,
must_free);
/** @todo add support for isoc release */
goto handle_nyet_done;
}
}
halt_channel(hcd, hc, qtd, DWC_OTG_HC_XFER_NYET, must_free);
goto handle_nyet_done;
}
hc->qh->ping_state = 1;
qtd->error_count = 0;
update_urb_state_xfer_intr(hc, hc_regs, qtd->urb, qtd,
DWC_OTG_HC_XFER_NYET);
dwc_otg_hcd_save_data_toggle(hc, hc_regs, qtd);
/*
* Halt the channel and re-start the transfer so the PING
* protocol will start.
*/
halt_channel(hcd, hc, qtd, DWC_OTG_HC_XFER_NYET, must_free);
handle_nyet_done:
disable_hc_int(hc_regs, nyet);
return 1;
}
/**
* Handles a host channel babble interrupt. This handler may be called in
* either DMA mode or Slave mode.
*/
static int handle_hc_babble_intr(struct dwc_otg_hcd *hcd,
struct dwc_hc *hc, struct dwc_otg_hc_regs __iomem *hc_regs,
struct dwc_otg_qtd *qtd, int *must_free)
{
DWC_DEBUGPL(DBG_HCD, "--Host Channel %d Interrupt: "
"Babble Error--\n", hc->hc_num);
if (hcd->core_if->dma_desc_enable) {
dwc_otg_hcd_complete_xfer_ddma(hcd, hc, hc_regs,
DWC_OTG_HC_XFER_BABBLE_ERR);
goto handle_babble_done;
}
if (hc->ep_type != USB_ENDPOINT_XFER_ISOC) {
dwc_otg_hcd_complete_urb(hcd, qtd->urb, -EOVERFLOW);
halt_channel(hcd, hc, qtd,
DWC_OTG_HC_XFER_BABBLE_ERR, must_free);
} else {
enum dwc_otg_halt_status halt_status;
halt_status = update_isoc_urb_state(hcd, hc, hc_regs, qtd,
DWC_OTG_HC_XFER_BABBLE_ERR);
halt_channel(hcd, hc, qtd, halt_status, must_free);
}
handle_babble_done:
disable_hc_int(hc_regs, bblerr);
return 1;
}
/**
* Handles a host channel AHB error interrupt. This handler is only called in
* DMA mode.
*/
static int handle_hc_ahberr_intr(struct dwc_otg_hcd *hcd, struct dwc_hc *hc,
struct dwc_otg_hc_regs __iomem *hc_regs,
struct dwc_otg_qtd *qtd)
{
union hcchar_data hcchar;
union hcsplt_data hcsplt;
union hctsiz_data hctsiz;
u32 hcdma;
struct urb *urb = qtd->urb;
DWC_DEBUGPL(DBG_HCD, "--Host Channel %d Interrupt: "
"AHB Error--\n", hc->hc_num);
hcchar.d32 = dwc_read_reg32(&hc_regs->hcchar);
hcsplt.d32 = dwc_read_reg32(&hc_regs->hcsplt);
hctsiz.d32 = dwc_read_reg32(&hc_regs->hctsiz);
hcdma = dwc_read_reg32(&hc_regs->hcdma);
DWC_ERROR("AHB ERROR, Channel %d\n", hc->hc_num);
DWC_ERROR(" hcchar 0x%08x, hcsplt 0x%08x\n", hcchar.d32, hcsplt.d32);
DWC_ERROR(" hctsiz 0x%08x, hcdma 0x%08x\n", hctsiz.d32, hcdma);
DWC_DEBUGPL(DBG_HCD, "DWC OTG HCD URB Enqueue\n");
DWC_ERROR(" Device address: %d\n", usb_pipedevice(urb->pipe));
DWC_ERROR(" Endpoint: %d, %s\n", usb_pipeendpoint(urb->pipe),
(usb_pipein(urb->pipe) ? "IN" : "OUT"));
DWC_ERROR(" Endpoint type: %s\n", ({
char *pipetype;
switch (usb_pipetype(urb->pipe)) {
case PIPE_CONTROL:
pipetype = "CONTROL"; break;
case PIPE_BULK:
pipetype = "BULK"; break;
case PIPE_INTERRUPT:
pipetype = "INTERRUPT"; break;
case PIPE_ISOCHRONOUS:
pipetype = "ISOCHRONOUS"; break;
default:
pipetype = "UNKNOWN"; break;
};
pipetype;
})) ;
DWC_ERROR(" Speed: %s\n", ({
char *speed;
switch (urb->dev->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;
};
speed;
})) ;
DWC_ERROR(" Max packet size: %d\n",
usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)));
DWC_ERROR(" Data buffer length: %d\n", urb->transfer_buffer_length);
DWC_ERROR(" Transfer buffer: %p, Transfer DMA: %p\n",
urb->transfer_buffer, (void *)(u32)urb->transfer_dma);
DWC_ERROR(" Setup buffer: %p, Setup DMA: %p\n", urb->setup_packet,
(void *)(u32)urb->setup_dma);
DWC_ERROR(" Interval: %d\n", urb->interval);
/* Core haltes the channel for Descriptor DMA mode */
if (hcd->core_if->dma_desc_enable) {
dwc_otg_hcd_complete_xfer_ddma(hcd, hc, hc_regs,
DWC_OTG_HC_XFER_AHB_ERR);
goto handle_ahberr_done;
}
dwc_otg_hcd_complete_urb(hcd, urb, -EIO);
/*
* Force a channel halt. Don't call halt_channel because that won't
* write to the HCCHARn register in DMA mode to force the halt.
*/
dwc_otg_hc_halt(hcd->core_if, hc, DWC_OTG_HC_XFER_AHB_ERR);
handle_ahberr_done:
disable_hc_int(hc_regs, ahberr);
return 1;
}
/**
* Handles a host channel transaction error interrupt. This handler may be
* called in either DMA mode or Slave mode.
*/
static int handle_hc_xacterr_intr(struct dwc_otg_hcd *hcd, struct dwc_hc *hc,
struct dwc_otg_hc_regs __iomem *hc_regs,
struct dwc_otg_qtd *qtd, int *must_free)
{
DWC_DEBUGPL(DBG_HCD, "--Host Channel %d Interrupt: "
"Transaction Error--\n", hc->hc_num);
if (hcd->core_if->dma_desc_enable) {
dwc_otg_hcd_complete_xfer_ddma(hcd, hc, hc_regs,
DWC_OTG_HC_XFER_XACT_ERR);
goto handle_xacterr_done;
}
switch (usb_pipetype(qtd->urb->pipe)) {
case PIPE_CONTROL:
case PIPE_BULK:
qtd->error_count++;
if (!hc->qh->ping_state) {
update_urb_state_xfer_intr(hc, hc_regs, qtd->urb,
qtd, DWC_OTG_HC_XFER_XACT_ERR);
dwc_otg_hcd_save_data_toggle(hc, hc_regs, qtd);
if (!hc->ep_is_in && qtd->urb->dev->speed ==
USB_SPEED_HIGH)
hc->qh->ping_state = 1;
}
/*
* Halt the channel so the transfer can be re-started from
* the appropriate point or the PING protocol will start.
*/
halt_channel(hcd, hc, qtd, DWC_OTG_HC_XFER_XACT_ERR, must_free);
break;
case PIPE_INTERRUPT:
qtd->error_count++;
if ((hc->do_split) && (hc->complete_split))
qtd->complete_split = 0;
halt_channel(hcd, hc, qtd, DWC_OTG_HC_XFER_XACT_ERR, must_free);
break;
case PIPE_ISOCHRONOUS: {
enum dwc_otg_halt_status halt_status;
halt_status = update_isoc_urb_state(hcd, hc, hc_regs, qtd,
DWC_OTG_HC_XFER_XACT_ERR);
halt_channel(hcd, hc, qtd, halt_status, must_free);
break;
}
}
handle_xacterr_done:
disable_hc_int(hc_regs, xacterr);
return 1;
}
/**
* Handles a host channel frame overrun interrupt. This handler may be called
* in either DMA mode or Slave mode.
*/
static int handle_hc_frmovrun_intr(struct dwc_otg_hcd *hcd,
struct dwc_hc *hc, struct dwc_otg_hc_regs __iomem *hc_regs,
struct dwc_otg_qtd *qtd, int *must_free)
{
DWC_DEBUGPL(DBG_HCD, "--Host Channel %d Interrupt: "
"Frame Overrun--\n", hc->hc_num);
switch (usb_pipetype(qtd->urb->pipe)) {
case PIPE_CONTROL:
case PIPE_BULK:
break;
case PIPE_INTERRUPT:
halt_channel(hcd, hc, qtd, DWC_OTG_HC_XFER_FRAME_OVERRUN,
must_free);
break;
case PIPE_ISOCHRONOUS: {
enum dwc_otg_halt_status halt_status;
halt_status = update_isoc_urb_state(hcd, hc, hc_regs,
qtd, DWC_OTG_HC_XFER_FRAME_OVERRUN);
halt_channel(hcd, hc, qtd, halt_status, must_free);
break;
}
}
disable_hc_int(hc_regs, frmovrun);
return 1;
}
/**
* Handles a host channel data toggle error interrupt. This handler may be
* called in either DMA mode or Slave mode.
*/
static int handle_hc_datatglerr_intr(struct dwc_otg_hcd *hcd,
struct dwc_hc *hc, struct dwc_otg_hc_regs __iomem *hc_regs,
struct dwc_otg_qtd *qtd, int *must_free)
{
DWC_DEBUGPL(DBG_HCD, "--Host Channel %d Interrupt: "
"Data Toggle Error--\n", hc->hc_num);
if (hc->ep_is_in)
qtd->error_count = 0;
else
DWC_ERROR("Data Toggle Error on OUT transfer,"
"channel %d\n", hc->hc_num);
disable_hc_int(hc_regs, datatglerr);
return 1;
}
#ifdef DEBUG
/**
* This function is 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 1 if halt status is ok, 0 otherwise.
*/
static inline int halt_status_ok(struct dwc_otg_hcd *hcd, struct dwc_hc *hc,
struct dwc_otg_hc_regs __iomem *hc_regs,
struct dwc_otg_qtd *qtd)
{
union hcchar_data hcchar;
union hctsiz_data hctsiz;
union hcint_data hcint;
union hcintmsk_data hcintmsk;
union hcsplt_data hcsplt;
if (hc->halt_status == DWC_OTG_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.d32 = dwc_read_reg32(&hc_regs->hcchar);
hctsiz.d32 = dwc_read_reg32(&hc_regs->hctsiz);
hcint.d32 = dwc_read_reg32(&hc_regs->hcint);
hcintmsk.d32 = dwc_read_reg32(&hc_regs->hcintmsk);
hcsplt.d32 = dwc_read_reg32(&hc_regs->hcsplt);
DWC_WARN("%s: hc->halt_status == "
"DWC_OTG_HC_XFER_NO_HALT_STATUS, "
"channel %d, hcchar 0x%08x, hctsiz 0x%08x, "
"hcint 0x%08x, hcintmsk 0x%08x, "
"hcsplt 0x%08x, qtd->complete_split %d\n",
__func__, hc->hc_num, hcchar.d32, hctsiz.d32,
hcint.d32, hcintmsk.d32, hcsplt.d32,
qtd->complete_split);
DWC_WARN("%s: no halt status, channel %d, ignoring interrupt\n",
__func__, hc->hc_num);
DWC_WARN("\n");
clear_hc_int(hc_regs, chhltd);
return 0;
}
/*
* 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.d32 = dwc_read_reg32(&hc_regs->hcchar);
if (hcchar.b.chdis) {
DWC_WARN("%s: hcchar.chdis set unexpectedly, "
"hcchar 0x%08x, trying to halt again\n", __func__,
hcchar.d32);
clear_hc_int(hc_regs, chhltd);
hc->halt_pending = 0;
halt_channel(hcd, hc, qtd, hc->halt_status, NULL);
return 0;
}
return 1;
}
#endif /* */
/**
* Handles a host Channel Halted interrupt in DMA mode. This handler
* determines the reason the channel halted and proceeds accordingly.
*/
static void
handle_hc_chhltd_intr_dma(struct dwc_otg_hcd *hcd, struct dwc_hc *hc,
struct dwc_otg_hc_regs __iomem *hc_regs,
struct dwc_otg_qtd *qtd,
int *must_free)
{
union hcint_data hcint;
union hcintmsk_data hcintmsk;
int out_nak_enh = 0;
/* For core with OUT NAK enhancement, the flow for high-
* speed CONTROL/BULK OUT is handled a little differently.
*/
if (hcd->core_if->snpsid >= OTG_CORE_REV_2_71a) {
if (hc->speed == USB_SPEED_HIGH && !hc->ep_is_in &&
(hc->ep_type == USB_ENDPOINT_XFER_CONTROL ||
hc->ep_type == USB_ENDPOINT_XFER_BULK)) {
out_nak_enh = 1;
}
}
if (hc->halt_status == DWC_OTG_HC_XFER_URB_DEQUEUE
|| (hc->halt_status == DWC_OTG_HC_XFER_AHB_ERR
&& !hcd->core_if->dma_desc_enable)) {
/*
* 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.
*/
if (hcd->core_if->dma_desc_enable)
dwc_otg_hcd_complete_xfer_ddma(hcd, hc, hc_regs,
hc->halt_status);
else
release_channel(hcd, hc, qtd, hc->halt_status,
must_free);
return;
}
/* Read the HCINTn register to determine the cause for the halt. */
hcint.d32 = dwc_read_reg32(&hc_regs->hcint);
hcintmsk.d32 = dwc_read_reg32(&hc_regs->hcintmsk);
if (hcint.b.xfercomp) {
/** @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 ((hc->ep_type == USB_ENDPOINT_XFER_ISOC) && (!hc->ep_is_in))
handle_hc_ack_intr(hcd, hc, hc_regs, qtd, must_free);
handle_hc_xfercomp_intr(hcd, hc, hc_regs, qtd, must_free);
} else if (hcint.b.stall) {
handle_hc_stall_intr(hcd, hc, hc_regs, qtd, must_free);
} else if (hcint.b.xacterr && !hcd->core_if->dma_desc_enable) {
if (out_nak_enh) {
if (hcint.b.nyet || hcint.b.nak || hcint.b.ack) {
DWC_PRINT("XactErr with NYET/NAK/ACK\n");
qtd->error_count = 0;
} else
DWC_PRINT("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.
*/
handle_hc_xacterr_intr(hcd, hc, hc_regs, qtd, must_free);
} else if (hcint.b.xcs_xact && hcd->core_if->dma_desc_enable) {
handle_hc_xacterr_intr(hcd, hc, hc_regs, qtd, must_free);
} else if (hcint.b.ahberr && hcd->core_if->dma_desc_enable) {
handle_hc_ahberr_intr(hcd, hc, hc_regs, qtd);
} else if (hcint.b.bblerr) {
handle_hc_babble_intr(hcd, hc, hc_regs, qtd , must_free);
} else if (hcint.b.frmovrun) {
handle_hc_frmovrun_intr(hcd, hc, hc_regs, qtd , must_free);
} else if (!out_nak_enh) {
if (hcint.b.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.
*/
handle_hc_nyet_intr(hcd, hc, hc_regs, qtd, must_free);
} else if (hcint.b.nak && !hcintmsk.b.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.
*/
handle_hc_nak_intr(hcd, hc, hc_regs, qtd, must_free);
} else if (hcint.b.ack && !hcintmsk.b.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.
*/
handle_hc_ack_intr(hcd, hc, hc_regs, qtd, must_free);
} else {
if (hc->ep_type == USB_ENDPOINT_XFER_INT ||
hc->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.
*/
#ifdef DEBUG
DWC_PRINT("%s: Halt channel %d (assume "
"incomplete periodic "
"transfer)\n",
__func__, hc->hc_num);
#endif
halt_channel(hcd, hc, qtd,
DWC_OTG_HC_XFER_PERIODIC_INCOMPLETE,
must_free);
} else {
DWC_ERROR("%s: Channel %d, DMA Mode -- "
"ChHltd set, but reason "
"for halting is unknown, nyet %d, "
"hcint 0x%08x, intsts 0x%08x\n",
__func__,
hc->hc_num,
hcint.b.nyet,
hcint.d32,
dwc_read_reg32(&hcd->
core_if->
core_global_regs->
gintsts));
}
}
} else {
DWC_PRINT("NYET/NAK/ACK/other in non-error case, 0x%08x\n",
hcint.d32);
}
}
/**
* 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 int handle_hc_chhltd_intr(struct dwc_otg_hcd *hcd, struct dwc_hc *hc,
struct dwc_otg_hc_regs __iomem *hc_regs,
struct dwc_otg_qtd *qtd, int *must_free)
{
DWC_DEBUGPL(DBG_HCD, "--Host Channel %d Interrupt: "
"Channel Halted--\n", hc->hc_num);
if (hcd->core_if->dma_enable)
handle_hc_chhltd_intr_dma(hcd, hc, hc_regs, qtd, must_free);
else {
#ifdef DEBUG
if (!halt_status_ok(hcd, hc, hc_regs, qtd))
return 1;
#endif
release_channel(hcd, hc, qtd, hc->halt_status, must_free);
}
return 1;
}
/** Handles interrupt for a specific Host Channel */
int dwc_otg_hcd_handle_hc_n_intr(struct dwc_otg_hcd *dwc_otg_hcd, u32 num)
{
int must_free = 0;
int retval = 0;
union hcint_data hcint;
union hcintmsk_data hcintmsk;
struct dwc_hc *hc;
struct dwc_otg_hc_regs __iomem *hc_regs;
struct dwc_otg_qtd *qtd;
DWC_DEBUGPL(DBG_HCDV, "--Host Channel Interrupt--, Channel %d\n", num);
spin_lock(&dwc_otg_hcd->lock);
hc = dwc_otg_hcd->hc_ptr_array[num];
hc_regs = dwc_otg_hcd->core_if->host_if->hc_regs[num];
hcint.d32 = dwc_read_reg32(&hc_regs->hcint);
hcintmsk.d32 = dwc_read_reg32(&hc_regs->hcintmsk);
DWC_DEBUGPL(DBG_HCDV, " hcint 0x%08x, hcintmsk 0x%08x, "
"hcint&hcintmsk 0x%08x\n",
hcint.d32, hcintmsk.d32, (hcint.d32 & hcintmsk.d32));
hcint.d32 = hcint.d32 & hcintmsk.d32;
/*
* The qtd_list can be empty, i.e. after a dequeue. In this case, lets
* ensure qtd is NULL instead of somewhere around qh to catch potential
* bugs, and WARN if any interrupts are active other than ChHltd.
*/
qtd = list_entry(hc->qh->qtd_list.next,
struct dwc_otg_qtd, qtd_list_entry);
if (unlikely(list_empty(&hc->qh->qtd_list))) {
qtd = NULL;
WARN(hcint.d32 != 0x2,
"non ChHltd irq active while qtd_list empty");
}
if (!dwc_otg_hcd->core_if->dma_enable) {
if ((hcint.b.chhltd) && (hcint.d32 != 0x2))
hcint.b.chhltd = 0;
}
if (hcint.b.xfercomp) {
retval |= handle_hc_xfercomp_intr(dwc_otg_hcd, hc,
hc_regs, qtd, &must_free);
/*
* 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.b.nyet = 0;
}
if (hcint.b.chhltd)
retval |= handle_hc_chhltd_intr(dwc_otg_hcd, hc, hc_regs,
qtd, &must_free);
if (hcint.b.ahberr)
retval |= handle_hc_ahberr_intr(dwc_otg_hcd, hc, hc_regs,
qtd);
if (hcint.b.stall)
retval |= handle_hc_stall_intr(dwc_otg_hcd, hc, hc_regs,
qtd, &must_free);
if (hcint.b.nak)
retval |= handle_hc_nak_intr(dwc_otg_hcd, hc, hc_regs,
qtd, &must_free);
if (hcint.b.ack)
retval |= handle_hc_ack_intr(dwc_otg_hcd, hc, hc_regs,
qtd, &must_free);
if (hcint.b.nyet)
retval |= handle_hc_nyet_intr(dwc_otg_hcd, hc, hc_regs,
qtd, &must_free);
if (hcint.b.xacterr)
retval |= handle_hc_xacterr_intr(dwc_otg_hcd, hc, hc_regs,
qtd, &must_free);
if (hcint.b.bblerr)
retval |= handle_hc_babble_intr(dwc_otg_hcd, hc, hc_regs,
qtd, &must_free);
if (hcint.b.frmovrun)
retval |= handle_hc_frmovrun_intr(dwc_otg_hcd, hc, hc_regs,
qtd, &must_free);
if (hcint.b.datatglerr)
retval |= handle_hc_datatglerr_intr(dwc_otg_hcd, hc, hc_regs,
qtd, &must_free);
/*
* Logic to free the qtd here, at the end of the hc intr
* processing, if the handling of this interrupt determined
* that it needs to be freed.
*/
if (must_free) {
/* Free the qtd here now that we are done using it. */
dwc_otg_hcd_qtd_free(qtd);
}
spin_unlock(&dwc_otg_hcd->lock);
return retval;
}
#endif /* DWC_DEVICE_ONLY */