[PATCH v16 05/10]USB/ppc4xx: Add Synopsys DWC OTG HCD interrupt function
Rupjyoti Sarmah
rsarmah at amcc.com
Thu May 3 22:34:33 EST 2012
FImplements DWC OTG USB HCD interrupt service routine.
Signed-off-by: Rupjyoti Sarmah <rsarmah at apm.com>
Signed-off-by: Tirumala R Marri <tmarri at apm.com>
Signed-off-by: Fushen Chen <fchen at apm.com>
Signed-off-by: Mark Miesfeld <mmiesfeld at apm.com>
---
drivers/usb/dwc/hcd_intr.c | 1472 ++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 1472 insertions(+), 0 deletions(-)
create mode 100644 drivers/usb/dwc/hcd_intr.c
diff --git a/drivers/usb/dwc/hcd_intr.c b/drivers/usb/dwc/hcd_intr.c
new file mode 100644
index 0000000..1239c78
--- /dev/null
+++ b/drivers/usb/dwc/hcd_intr.c
@@ -0,0 +1,1472 @@
+/*
+ * DesignWare HS OTG controller driver
+ * Copyright (C) 2006 Synopsys, Inc.
+ * Portions Copyright (C) 2010 Applied Micro Circuits Corporation.
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License version 2 for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see http://www.gnu.org/licenses
+ * or write to the Free Software Foundation, Inc., 51 Franklin Street,
+ * Suite 500, Boston, MA 02110-1335 USA.
+ *
+ * Based on Synopsys driver version 2.60a
+ * Modified by Mark Miesfeld <mmiesfeld at apm.com>
+ * Modified by Stefan Roese <sr at denx.de>, DENX Software Engineering
+ * Modified by Chuck Meade <chuck at theptrgroup.com>
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING BUT NOT LIMITED TO THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL SYNOPSYS, INC. 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.
+ *
+ */
+
+#include "hcd.h"
+
+/* This file contains the implementation of the HCD Interrupt handlers. */
+static const int erratum_usb09_patched;
+static const int deferral_on = 1;
+static const int nak_deferral_delay = 8;
+static const int nyet_deferral_delay = 1;
+
+/**
+ * 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 int dwc_otg_hcd_handle_sof_intr(struct dwc_hcd *hcd)
+{
+ u32 hfnum;
+ struct list_head *qh_entry;
+ struct dwc_qh *qh;
+ enum dwc_transaction_type tr_type;
+ u32 gintsts = 0;
+
+ hfnum =
+ dwc_reg_read(hcd->core_if->host_if->host_global_regs,
+ DWC_HFNUM);
+
+ hcd->frame_number = DWC_HFNUM_FRNUM_RD(hfnum);
+
+ /* 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_qh, qh_list_entry);
+ qh_entry = qh_entry->next;
+
+ /*
+ * If needed, move QH to the ready list to be executed next
+ * (micro)frame.
+ */
+ if (dwc_frame_num_le(qh->sched_frame, hcd->frame_number))
+ list_move(&qh->qh_list_entry,
+ &hcd->periodic_sched_ready);
+ }
+
+ tr_type = dwc_otg_hcd_select_transactions(hcd);
+ if (tr_type != DWC_OTG_TRANSACTION_NONE)
+ dwc_otg_hcd_queue_transactions(hcd, tr_type);
+
+ /* Clear interrupt */
+ gintsts |= DWC_INTMSK_STRT_OF_FRM;
+ dwc_reg_write(gintsts_reg(hcd), 0, gintsts);
+ 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.
+ */
+static int dwc_otg_hcd_handle_rx_status_q_level_intr(struct dwc_hcd *hcd)
+{
+ u32 grxsts;
+ struct dwc_hc *hc;
+
+ grxsts = dwc_reg_read(hcd->core_if->core_global_regs, DWC_GRXSTSP);
+ hc = hcd->hc_ptr_array[grxsts & DWC_HM_RXSTS_CHAN_NUM_RD(grxsts)];
+
+ /* Packet Status */
+ switch (DWC_HM_RXSTS_PKT_STS_RD(grxsts)) {
+ case DWC_GRXSTS_PKTSTS_IN:
+ /* Read the data into the host buffer. */
+ if (DWC_HM_RXSTS_BYTE_CNT_RD(grxsts) > 0) {
+ dwc_otg_read_packet(hcd->core_if, hc->xfer_buff,
+ DWC_HM_RXSTS_BYTE_CNT_RD(grxsts));
+ /* Update the HC fields for the next packet received. */
+ hc->xfer_count += DWC_HM_RXSTS_BYTE_CNT_RD(grxsts);
+ hc->xfer_buff += DWC_HM_RXSTS_BYTE_CNT_RD(grxsts);
+ }
+ 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:
+ pr_err("RX_STS_Q Interrupt: Unknown status %d\n",
+ DWC_HM_RXSTS_PKT_STS_RD(grxsts));
+ break;
+ }
+ 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.
+ */
+static int dwc_otg_hcd_handle_np_tx_fifo_empty_intr(struct dwc_hcd *hcd)
+{
+ dwc_otg_hcd_queue_transactions(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.
+ */
+static int dwc_otg_hcd_handle_perio_tx_fifo_empty_intr(struct dwc_hcd *hcd)
+{
+ dwc_otg_hcd_queue_transactions(hcd, DWC_OTG_TRANSACTION_PERIODIC);
+ return 1;
+}
+
+/**
+ * When the port changes to enabled it may be necessary to adjust the phy clock
+ * speed.
+ */
+static int adjusted_phy_clock_speed(struct dwc_hcd *hcd, u32 hprt0)
+{
+ int adjusted = 0;
+ u32 usbcfg;
+ ulong global_regs = hcd->core_if->core_global_regs;
+ struct core_params *params = hcd->core_if->core_params;
+ ulong h_regs = hcd->core_if->host_if->host_global_regs;
+
+ usbcfg = dwc_reg_read(global_regs, DWC_GUSBCFG);
+
+ if (DWC_HPRT0_PRT_SPD_RD(hprt0) == DWC_HPRT0_PRTSPD_LOW_SPEED ||
+ DWC_HPRT0_PRT_SPD_RD(hprt0) == DWC_HPRT0_PRTSPD_FULL_SPEED) {
+ /* Low power */
+ u32 hcfg;
+
+ if (!(usbcfg & DWC_USBCFG_PHYLPWRCLKSEL)) {
+ /* Set PHY low power clock select for FS/LS devices */
+ usbcfg |= DWC_USBCFG_PHYLPWRCLKSEL;
+ dwc_reg_write(global_regs, DWC_GUSBCFG, usbcfg);
+ adjusted = 1;
+ }
+
+ hcfg = dwc_reg_read(h_regs, DWC_HCFG);
+ if (DWC_HPRT0_PRT_SPD_RD(hprt0) == DWC_HPRT0_PRTSPD_LOW_SPEED &&
+ params->host_ls_low_power_phy_clk ==
+ DWC_HOST_LS_LOW_POWER_PHY_CLK_PARAM_6MHZ) {
+ /* 6 MHZ, check for 6 MHZ clock select */
+ if (DWC_HCFG_FSLSP_CLK_RD(hcfg) != DWC_HCFG_6_MHZ) {
+ hcfg = DWC_HCFG_FSLSP_CLK_RW(hcfg,
+ DWC_HCFG_6_MHZ);
+ dwc_reg_write(h_regs, DWC_HCFG, hcfg);
+ adjusted = 1;
+ }
+ } else if (DWC_HCFG_FSLSP_CLK_RD(hcfg) != DWC_HCFG_48_MHZ) {
+ /* 48 MHZ and clock select is not 48 MHZ */
+ hcfg = DWC_HCFG_FSLSP_CLK_RW(hcfg, DWC_HCFG_48_MHZ);
+ dwc_reg_write(h_regs, DWC_HCFG, hcfg);
+ adjusted = 1;
+ }
+ } else if (usbcfg & DWC_USBCFG_PHYLPWRCLKSEL) {
+ usbcfg &= ~((u32) DWC_USBCFG_PHYLPWRCLKSEL);
+ dwc_reg_write(global_regs, DWC_GUSBCFG, usbcfg);
+ adjusted = 1;
+ }
+ if (adjusted)
+ schedule_work(&hcd->usb_port_reset);
+
+ return adjusted;
+}
+
+/**
+ * Helper function to handle the port enable changed interrupt when the port
+ * becomes enabled. Checks if we need to adjust the PHY clock speed for low
+ * power and adjusts it if needed.
+ */
+static void port_enabled(struct dwc_hcd *hcd, u32 hprt0)
+{
+ if (hcd->core_if->core_params->host_support_fs_ls_low_power)
+ if (!adjusted_phy_clock_speed(hcd, hprt0))
+ hprt0 = DWC_HPRT0_PRT_RES_RW(hprt0, 0);
+ dwc_reg_write(hcd->core_if->host_if->hprt0, 0, hprt0);
+}
+
+/**
+ * There are multiple conditions that can cause a port interrupt. This function
+ * determines which interrupt conditions have occurred and handles them
+ * appropriately.
+ */
+static int dwc_otg_hcd_handle_port_intr(struct dwc_hcd *hcd)
+{
+ int retval = 0;
+ u32 hprt0;
+ u32 hprt0_modify;
+
+ hprt0 = dwc_reg_read(hcd->core_if->host_if->hprt0, 0);
+ hprt0_modify = dwc_reg_read(hcd->core_if->host_if->hprt0, 0);
+
+ /*
+ * Clear appropriate bits in HPRT0 to clear the interrupt bit in
+ * GINTSTS
+ */
+ hprt0_modify = DWC_HPRT0_PRT_ENA_RW(hprt0_modify, 0);
+ hprt0_modify = DWC_HPRT0_PRT_CONN_DET_RW(hprt0_modify, 0);
+ hprt0_modify = DWC_HPRT0_PRT_ENA_DIS_CHG_RW(hprt0_modify, 0);
+ hprt0_modify = DWC_HPRT0_PRT_OVRCURR_CHG_RW(hprt0_modify, 0);
+
+ /* Port connect detected interrupt */
+ if (DWC_HPRT0_PRT_CONN_DET_RD(hprt0)) {
+ /* Set the status flags and clear interrupt */
+ hprt0_modify = DWC_HPRT0_PRT_CONN_DET_RW(hprt0_modify, 1);
+
+ /* B-Device has connected, Delete the connection timer. */
+ del_timer_sync(&hcd->conn_timer);
+
+ /*
+ * The Hub driver asserts a reset when it sees port connect
+ * status change flag
+ */
+ retval |= 1;
+ }
+
+ /* Port enable changed interrupt */
+ if (DWC_HPRT0_PRT_ENA_DIS_CHG_RD(hprt0)) {
+ /* Set the internal flag if the port was disabled */
+ if (DWC_HPRT0_PRT_ENA_RD(hprt0))
+ port_enabled(hcd, hprt0);
+ /* Clear the interrupt */
+ hprt0_modify = DWC_HPRT0_PRT_ENA_DIS_CHG_RW(hprt0_modify, 1);
+ retval |= 1;
+ }
+
+ /* Overcurrent change interrupt */
+ if (DWC_HPRT0_PRT_OVRCURR_CHG_RD(hprt0)) {
+ hprt0_modify = DWC_HPRT0_PRT_OVRCURR_CHG_RW(hprt0_modify, 1);
+ retval |= 1;
+ }
+
+ /* Clear the port interrupts */
+ dwc_reg_write(hcd->core_if->host_if->hprt0, 0, hprt0_modify);
+ 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, ulong regs,
+ struct dwc_qtd *qtd,
+ enum dwc_halt_status halt_status,
+ int *_short_read)
+{
+ u32 hctsiz = 0;
+ u32 length;
+
+ if (_short_read)
+ *_short_read = 0;
+
+ hctsiz = dwc_reg_read(regs, DWC_HCTSIZ);
+ if (halt_status == DWC_OTG_HC_XFER_COMPLETE) {
+ if (hc->ep_is_in) {
+ length = hc->xfer_len - DWC_HCTSIZ_XFER_SIZE_RD(hctsiz);
+ if (_short_read)
+ *_short_read =
+ (DWC_HCTSIZ_XFER_SIZE_RD(hctsiz) != 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 - DWC_HCTSIZ_PKT_CNT_RD(hctsiz)) *
+ 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.
+ */
+static int update_urb_state_xfer_comp(struct dwc_hc *hc,
+ ulong regs, struct urb *urb,
+ struct dwc_qtd *qtd, int *status)
+{
+ int xfer_done = 0;
+ int short_read = 0;
+
+ urb->actual_length += get_actual_xfer_length(hc, regs, qtd,
+ DWC_OTG_HC_XFER_COMPLETE,
+ &short_read);
+
+ 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;
+ }
+ 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.
+ */
+static void save_data_toggle(struct dwc_hc *hc, ulong regs, struct dwc_qtd *qtd)
+{
+ u32 hctsiz = 0;
+ hctsiz = dwc_reg_read(regs, DWC_HCTSIZ);
+
+ if (hc->ep_type != DWC_OTG_EP_TYPE_CONTROL) {
+ struct dwc_qh *qh = hc->qh;
+
+ if (DWC_HCTSIZ_PKT_PID_RD(hctsiz) == DWC_HCTSIZ_DATA0)
+ qh->data_toggle = DWC_OTG_HC_PID_DATA0;
+ else
+ qh->data_toggle = DWC_OTG_HC_PID_DATA1;
+ } else {
+ if (DWC_HCTSIZ_PKT_PID_RD(hctsiz) == DWC_HCTSIZ_DATA0)
+ qtd->data_toggle = DWC_OTG_HC_PID_DATA0;
+ else
+ qtd->data_toggle = DWC_OTG_HC_PID_DATA1;
+ }
+}
+
+/**
+ * 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_hcd *hcd, struct dwc_qh *qh, int free_qtd)
+{
+ int continue_split = 0;
+ struct dwc_qtd *qtd;
+
+ qtd = list_entry(qh->qtd_list.next, struct dwc_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;
+
+ if (free_qtd) {
+ dwc_otg_hcd_qtd_remove(qtd);
+ continue_split = 0;
+ }
+
+ qh->channel = NULL;
+ qh->qtd_in_process = NULL;
+ dwc_otg_hcd_qh_deactivate(hcd, qh, continue_split);
+}
+
+/**
+ * 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 status. Completes the
+ * Isochronous URB if all the URB frames have been completed.
+ */
+static enum dwc_halt_status update_isoc_urb_state(struct dwc_hcd *hcd,
+ struct dwc_hc *hc, u32 regs,
+ struct dwc_qtd *qtd,
+ enum dwc_halt_status status)
+{
+ struct urb *urb = qtd->urb;
+ enum dwc_halt_status ret_val = status;
+ struct usb_iso_packet_descriptor *frame_desc;
+ frame_desc = &urb->iso_frame_desc[qtd->isoc_frame_index];
+
+ switch (status) {
+ case DWC_OTG_HC_XFER_COMPLETE:
+ frame_desc->status = 0;
+ frame_desc->actual_length =
+ get_actual_xfer_length(hc, regs, qtd, status, NULL);
+ 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:
+ /* Don't need to update actual_length in this case. */
+ urb->error_count++;
+ frame_desc->status = -EOVERFLOW;
+ break;
+ case DWC_OTG_HC_XFER_XACT_ERR:
+ urb->error_count++;
+ frame_desc->status = -EPROTO;
+ frame_desc->actual_length =
+ get_actual_xfer_length(hc, regs, qtd, status, NULL);
+ default:
+ pr_err("%s: Unhandled halt_status (%d)\n", __func__, 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;
+}
+
+/**
+ * Releases a host channel for use by other transfers. Attempts to select and
+ * queue more transactions since at least one host channel is available.
+ */
+static void release_channel(struct dwc_hcd *hcd, struct dwc_hc *hc,
+ struct dwc_qtd *qtd,
+ enum dwc_halt_status halt_status, int *must_free)
+{
+ enum dwc_transaction_type tr_type;
+ int free_qtd;
+ int deact = 1;
+ struct dwc_qh *qh;
+ int retry_delay = 1;
+
+ 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) {
+ 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:
+ pr_err("%s: No halt_status, channel %d\n", __func__,
+ hc->hc_num);
+ free_qtd = 0;
+ break;
+ default:
+ free_qtd = 0;
+ break;
+ }
+ if (free_qtd)
+ /* must_free pre-initialized to zero */
+ *must_free = 1;
+ 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);
+ hcd->available_host_channels++;
+ /* Try to queue more transfers now that there's a free channel. */
+ if (!erratum_usb09_patched) {
+ tr_type = dwc_otg_hcd_select_transactions(hcd);
+ 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_hcd *hcd, struct dwc_hc *hc,
+ struct dwc_qtd *qtd, enum dwc_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) {
+ u32 gintmsk = 0;
+
+ if (hc->ep_type == DWC_OTG_EP_TYPE_CONTROL ||
+ hc->ep_type == DWC_OTG_EP_TYPE_BULK) {
+ /*
+ * Make sure the Non-periodic Tx FIFO empty interrupt
+ * is enabled so that the non-periodic schedule will
+ * be processed.
+ */
+ gintmsk |= DWC_INTMSK_NP_TXFIFO_EMPT;
+ dwc_reg_modify(gintmsk_reg(hcd), 0, 0, gintmsk);
+ } 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 |= DWC_INTMSK_P_TXFIFO_EMPTY;
+ dwc_reg_modify(gintmsk_reg(hcd), 0, 0, 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 complete_non_periodic_xfer(struct dwc_hcd *hcd, struct dwc_hc *hc,
+ ulong regs, struct dwc_qtd *qtd,
+ enum dwc_halt_status halt_status,
+ int *must_free)
+{
+ u32 hcint;
+
+ qtd->error_count = 0;
+ hcint = dwc_reg_read(regs, DWC_HCINT);
+ if (DWC_HCINT_NYET_RESP_REC_RD(hcint)) {
+ u32 hcint_clear = 0;
+
+ hcint_clear = DWC_HCINT_NYET_RESP_REC_RW(hcint_clear, 1);
+ /*
+ * 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;
+ dwc_reg_write(regs, DWC_HCINT, hcint_clear);
+ }
+
+ /*
+ * 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.
+ *
+ * IN transfers in Slave mode require an explicit disable to
+ * halt the channel. (In DMA mode, this call simply releases
+ * the channel.)
+ *
+ * The channel is automatically disabled by the core for OUT
+ * transfers in Slave mode.
+ */
+ if (hc->ep_is_in)
+ halt_channel(hcd, hc, qtd, halt_status, must_free);
+ else
+ 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_hcd *hcd, struct dwc_hc *hc,
+ ulong regs, struct dwc_qtd *qtd,
+ enum dwc_halt_status halt_status,
+ int *must_free)
+{
+ u32 hctsiz = 0;
+
+ hctsiz = dwc_reg_read(regs, DWC_HCTSIZ);
+ qtd->error_count = 0;
+
+ /*
+ * For OUT transfers and 0 packet count, the Core halts the channel,
+ * otherwise, Flush any outstanding requests from the Tx queue.
+ */
+ if (!hc->ep_is_in || (DWC_HCTSIZ_PKT_CNT_RD(hctsiz) == 0))
+ release_channel(hcd, hc, qtd, halt_status, must_free);
+ else
+ halt_channel(hcd, hc, qtd, halt_status, must_free);
+}
+
+/**
+ * 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_hcd *hcd, struct dwc_hc *hc,
+ ulong regs, struct dwc_qtd *qtd,
+ int *must_free)
+{
+ int urb_xfer_done;
+ enum dwc_halt_status halt_status = DWC_OTG_HC_XFER_COMPLETE;
+ struct urb *urb = qtd->urb;
+ int pipe_type = usb_pipetype(urb->pipe);
+ int status = -EINPROGRESS;
+ u32 hcintmsk = 0;
+
+ /* Handle xfer complete on CSPLIT. */
+ if (hc->qh->do_split)
+ 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;
+ halt_status = DWC_OTG_HC_XFER_COMPLETE;
+ break;
+ case DWC_OTG_CONTROL_DATA:
+ urb_xfer_done = update_urb_state_xfer_comp(hc, regs,
+ urb, qtd,
+ &status);
+ if (urb_xfer_done)
+ qtd->control_phase = DWC_OTG_CONTROL_STATUS;
+ else
+ save_data_toggle(hc, regs, qtd);
+ halt_status = DWC_OTG_HC_XFER_COMPLETE;
+ break;
+ case DWC_OTG_CONTROL_STATUS:
+ 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, regs, qtd,
+ halt_status, must_free);
+ break;
+ case PIPE_BULK:
+ urb_xfer_done = update_urb_state_xfer_comp(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;
+ }
+
+ save_data_toggle(hc, regs, qtd);
+ complete_non_periodic_xfer(hcd, hc, regs, qtd,
+ halt_status, must_free);
+ break;
+ case PIPE_INTERRUPT:
+ update_urb_state_xfer_comp(hc, regs, urb, qtd, &status);
+ /*
+ * Interrupt URB is done on the first transfer complete
+ * interrupt.
+ */
+ dwc_otg_hcd_complete_urb(hcd, urb, status);
+ save_data_toggle(hc, regs, qtd);
+ complete_periodic_xfer(hcd, hc, regs, qtd,
+ DWC_OTG_HC_XFER_URB_COMPLETE, must_free);
+ break;
+ case PIPE_ISOCHRONOUS:
+ if (qtd->isoc_split_pos == DWC_HCSPLIT_XACTPOS_ALL) {
+ halt_status = update_isoc_urb_state(hcd, hc, regs, qtd,
+ DWC_OTG_HC_XFER_COMPLETE);
+ }
+ complete_periodic_xfer(hcd, hc, regs, qtd,
+ halt_status, must_free);
+ break;
+ }
+
+ /* disable xfercompl */
+ hcintmsk = DWC_HCINTMSK_TXFER_CMPL_RW(hcintmsk, 1);
+ dwc_reg_modify(regs, DWC_HCINTMSK, hcintmsk, 0);
+
+ 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_hcd *hcd, struct dwc_hc *hc,
+ u32 regs, struct dwc_qtd *qtd, int *must_free)
+{
+ struct urb *urb = qtd->urb;
+ int pipe_type = usb_pipetype(urb->pipe);
+ u32 hcintmsk = 0;
+
+ 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);
+ /* disable stall */
+ hcintmsk = DWC_HCINTMSK_STALL_RESP_REC_RW(hcintmsk, 1);
+ dwc_reg_modify(regs, DWC_HCINTMSK, hcintmsk, 0);
+
+ 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,
+ u32 regs, struct urb *urb,
+ struct dwc_qtd *qtd,
+ enum dwc_halt_status sts)
+{
+ u32 xfr_len = get_actual_xfer_length(hc, regs, qtd, sts, NULL);
+ urb->actual_length += xfr_len;
+}
+
+/**
+ * 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_hcd *hcd, struct dwc_hc *hc,
+ u32 regs, struct dwc_qtd *qtd, int *must_free)
+{
+ u32 hcintmsk = 0;
+
+ /*
+ * 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, regs, qtd->urb, qtd,
+ DWC_OTG_HC_XFER_NAK);
+
+ save_data_toggle(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 nak */
+ hcintmsk = DWC_HCINTMSK_NAK_RESP_REC_RW(hcintmsk, 1);
+ dwc_reg_modify(regs, DWC_HCINTMSK, hcintmsk, 0);
+
+ return 1;
+}
+
+/**
+ * Helper function for handle_hc_ack_intr(). Sets the split values for an ACK
+ * on SSPLIT for ISOC OUT.
+ */
+static void set_isoc_out_vals(struct dwc_hc *hc, struct dwc_qtd *qtd)
+{
+ struct usb_iso_packet_descriptor *frame_desc;
+
+ 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.
+ */
+ 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;
+ }
+}
+
+/**
+ * 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_hcd *hcd, struct dwc_hc *hc,
+ u32 regs, struct dwc_qtd *qtd, int *must_free)
+{
+ u32 hcintmsk = 0;
+
+ 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;
+
+ /* Don't need complete for isochronous out transfers. */
+ if (!(hc->ep_type == DWC_OTG_EP_TYPE_ISOC && !hc->ep_is_in))
+ qtd->complete_split = 1;
+
+ if (hc->ep_type == DWC_OTG_EP_TYPE_ISOC && !hc->ep_is_in)
+ set_isoc_out_vals(hc, qtd);
+ 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 ack */
+ hcintmsk = DWC_HCINTMSK_ACK_RESP_REC_RW(hcintmsk, 1);
+ dwc_reg_modify(regs, DWC_HCINTMSK, hcintmsk, 0);
+
+ 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_hcd *hcd, struct dwc_hc *hc,
+ u32 regs, struct dwc_qtd *qtd, int *must_free)
+{
+ u32 hcintmsk = 0;
+ u32 hcint_clear = 0;
+
+ /*
+ * NYET on CSPLIT
+ * re-do the CSPLIT immediately on non-periodic
+ */
+ if (hc->do_split && hc->complete_split) {
+ if (hc->ep_type == DWC_OTG_EP_TYPE_INTR ||
+ hc->ep_type == DWC_OTG_EP_TYPE_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)) {
+ qtd->complete_split = 0;
+ halt_channel(hcd, hc, qtd,
+ DWC_OTG_HC_XFER_XACT_ERR,
+ must_free);
+ 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, regs, qtd->urb, qtd,
+ DWC_OTG_HC_XFER_NYET);
+ save_data_toggle(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 nyet */
+ hcintmsk = DWC_HCINTMSK_NYET_RESP_REC_RW(hcintmsk, 1);
+ dwc_reg_modify(regs, DWC_HCINTMSK, hcintmsk, 0);
+ /* clear nyet */
+ hcint_clear = DWC_HCINT_NYET_RESP_REC_RW(hcint_clear, 1);
+ dwc_reg_write(regs, DWC_HCINT, hcint_clear);
+ 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_hcd *hcd, struct dwc_hc *hc,
+ u32 regs, struct dwc_qtd *qtd, int *must_free)
+{
+ u32 hcintmsk = 0;
+
+ if (hc->ep_type != DWC_OTG_EP_TYPE_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_halt_status halt_status;
+ halt_status = update_isoc_urb_state(hcd, hc, regs, qtd,
+ DWC_OTG_HC_XFER_BABBLE_ERR);
+ halt_channel(hcd, hc, qtd, halt_status, must_free);
+ }
+ /* disable bblerr */
+ hcintmsk = DWC_HCINTMSK_BBL_ERR_RW(hcintmsk, 1);
+ dwc_reg_modify(regs, DWC_HCINTMSK, hcintmsk, 0);
+ 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_hcd *hcd, struct dwc_hc *hc,
+ u32 regs, struct dwc_qtd *qtd)
+{
+ u32 hcchar;
+ u32 hcsplt;
+ u32 hctsiz = 0;
+ u32 hcdma;
+ struct urb *urb = qtd->urb;
+ u32 hcintmsk = 0;
+
+ hcchar = dwc_reg_read(regs, DWC_HCCHAR);
+ hcsplt = dwc_reg_read(regs, DWC_HCSPLT);
+ hctsiz = dwc_reg_read(regs, DWC_HCTSIZ);
+ hcdma = dwc_reg_read(regs, DWC_HCDMA);
+
+ pr_err("AHB ERROR, Channel %d\n", hc->hc_num);
+ pr_err(" hcchar 0x%08x, hcsplt 0x%08x\n", hcchar, hcsplt);
+ pr_err(" hctsiz 0x%08x, hcdma 0x%08x\n", hctsiz, hcdma);
+
+ pr_err(" Device address: %d\n", usb_pipedevice(urb->pipe));
+ pr_err(" Endpoint: %d, %s\n", usb_pipeendpoint(urb->pipe),
+ (usb_pipein(urb->pipe) ? "IN" : "OUT"));
+
+ pr_err(" Endpoint type: %s\n", pipetype_str(urb->pipe));
+ pr_err(" Speed: %s\n", dev_speed_str(urb->dev->speed));
+ pr_err(" Max packet size: %d\n",
+ usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)));
+ pr_err(" Data buffer length: %d\n", urb->transfer_buffer_length);
+ pr_err(" Transfer buffer: %p, Transfer DMA: %p\n",
+ urb->transfer_buffer, (void *)(u32) urb->transfer_dma);
+ pr_err(" Setup buffer: %p, Setup DMA: %p\n",
+ urb->setup_packet, (void *)(u32) urb->setup_dma);
+ pr_err(" Interval: %d\n", urb->interval);
+
+ 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);
+ /* disable ahberr */
+ hcintmsk = DWC_HCINTMSK_AHB_ERR_RW(hcintmsk, 1);
+ dwc_reg_modify(regs, DWC_HCINTMSK, hcintmsk, 0);
+
+ 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_hcd *hcd, struct dwc_hc *hc,
+ u32 regs, struct dwc_qtd *qtd, int *must_free)
+{
+ enum dwc_halt_status status = DWC_OTG_HC_XFER_XACT_ERR;
+ u32 hcintmsk = 0;
+
+ 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, regs, qtd->urb, qtd,
+ status);
+ save_data_toggle(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, status, 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, status, must_free);
+ break;
+ case PIPE_ISOCHRONOUS:
+ status = update_isoc_urb_state(hcd, hc, regs, qtd, status);
+ halt_channel(hcd, hc, qtd, status, must_free);
+ break;
+ }
+ /* Disable xacterr */
+ hcintmsk = DWC_HCINTMSK_TRANS_ERR_RW(hcintmsk, 1);
+ dwc_reg_modify(regs, DWC_HCINTMSK, hcintmsk, 0);
+
+ 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_hcd *hcd, struct dwc_hc *hc,
+ u32 regs, struct dwc_qtd *qtd,
+ int *must_free)
+{
+ enum dwc_halt_status status = DWC_OTG_HC_XFER_FRAME_OVERRUN;
+ u32 hcintmsk = 0;
+
+ switch (usb_pipetype(qtd->urb->pipe)) {
+ case PIPE_CONTROL:
+ case PIPE_BULK:
+ break;
+ case PIPE_INTERRUPT:
+ halt_channel(hcd, hc, qtd, status, must_free);
+ break;
+ case PIPE_ISOCHRONOUS:
+ status = update_isoc_urb_state(hcd, hc, regs, qtd, status);
+ halt_channel(hcd, hc, qtd, status, must_free);
+ break;
+ }
+ /* Disable frmovrun */
+ hcintmsk = DWC_HCINTMSK_FRAME_OVERN_ERR_RW(hcintmsk, 1);
+ dwc_reg_modify(regs, DWC_HCINTMSK, hcintmsk, 0);
+
+ 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_hcd *hcd, struct dwc_hc *hc,
+ u32 regs, struct dwc_qtd *qtd)
+{
+ u32 hcintmsk = 0;
+
+ if (hc->ep_is_in)
+ qtd->error_count = 0;
+ else
+ pr_err("Data Toggle Error on OUT transfer, channel "
+ "%d\n", hc->hc_num);
+
+ /* disable datatglerr */
+ hcintmsk = DWC_HCINTMSK_DATA_TOG_ERR_RW(hcintmsk, 1);
+ dwc_reg_modify(regs, DWC_HCINTMSK, hcintmsk, 0);
+
+ return 1;
+}
+
+/**
+ * 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_hcd *hcd, struct dwc_hc *hc,
+ ulong regs, struct dwc_qtd *qtd,
+ int *must_free)
+{
+ u32 hcint;
+ u32 hcintmsk = 0;
+
+ if (hc->halt_status == DWC_OTG_HC_XFER_URB_DEQUEUE ||
+ hc->halt_status == DWC_OTG_HC_XFER_AHB_ERR) {
+ /*
+ * 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.
+ */
+ release_channel(hcd, hc, qtd, hc->halt_status, must_free);
+ return;
+ }
+
+ /* Read the HCINTn register to determine the cause for the halt. */
+ hcint = dwc_reg_read(regs, DWC_HCINT);
+ hcintmsk = dwc_reg_read(regs, DWC_HCINTMSK);
+ if (DWC_HCINT_TXFER_CMPL_RD(hcint)) {
+ /*
+ * 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 == DWC_OTG_EP_TYPE_ISOC && !hc->ep_is_in)
+ handle_hc_ack_intr(hcd, hc, regs, qtd, must_free);
+
+ handle_hc_xfercomp_intr(hcd, hc, regs, qtd, must_free);
+ } else if (DWC_HCINT_STALL_RESP_REC_RD(hcint)) {
+ handle_hc_stall_intr(hcd, hc, regs, qtd, must_free);
+ } else if (DWC_HCINT_TRANS_ERR_RD(hcint)) {
+ /*
+ * 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, regs, qtd, must_free);
+ } else if (DWC_HCINT_NYET_RESP_REC_RD(hcint)) {
+ /*
+ * 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, regs, qtd, must_free);
+ } else if (DWC_HCINT_BBL_ERR_RD(hcint)) {
+ handle_hc_babble_intr(hcd, hc, regs, qtd, must_free);
+ } else if (DWC_HCINT_FRAME_OVERN_ERR_RD(hcint)) {
+ handle_hc_frmovrun_intr(hcd, hc, regs, qtd, must_free);
+ } else if (DWC_HCINT_DATA_TOG_ERR_RD(hcint)) {
+ handle_hc_datatglerr_intr(hcd, hc, regs, qtd);
+ hc->qh->data_toggle = 0;
+ halt_channel(hcd, hc, qtd, hc->halt_status, must_free);
+ } else if (DWC_HCINT_NAK_RESP_REC_RD(hcint) &&
+ !DWC_HCINTMSK_NAK_RESP_REC_RD(hcintmsk)) {
+ /*
+ * 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, regs, qtd, must_free);
+ } else if (DWC_HCINT_ACK_RESP_REC_RD(hcint) &&
+ !DWC_HCINTMSK_ACK_RESP_REC_RD(hcintmsk)) {
+ /*
+ * 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, regs, qtd, must_free);
+ } else {
+ if (hc->ep_type == DWC_OTG_EP_TYPE_INTR ||
+ hc->ep_type == DWC_OTG_EP_TYPE_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.
+ */
+ halt_channel(hcd, hc, qtd,
+ DWC_OTG_HC_XFER_PERIODIC_INCOMPLETE,
+ must_free);
+ } else {
+ pr_err("%s: Channel %d, DMA Mode -- ChHltd "
+ "set, but reason for halting is unknown, "
+ "hcint 0x%08x, intsts 0x%08x\n",
+ __func__, hc->hc_num, hcint,
+ dwc_reg_read(gintsts_reg(hcd), 0));
+ }
+ }
+}
+
+/**
+ * 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_hcd *hcd, struct dwc_hc *hc,
+ ulong regs, struct dwc_qtd *qtd, int *must_free)
+{
+ if (hcd->core_if->dma_enable)
+ handle_hc_chhltd_intr_dma(hcd, hc, regs, qtd, must_free);
+ else
+ release_channel(hcd, hc, qtd, hc->halt_status, must_free);
+
+ return 1;
+}
+
+/* Handles interrupt for a specific Host Channel */
+static int dwc_otg_hcd_handle_hc_n_intr(struct dwc_hcd *hcd, u32 num)
+{
+ int must_free = 0;
+ int retval = 0;
+ u32 hcint;
+ u32 hcintmsk = 0;
+ struct dwc_hc *hc;
+ ulong hc_regs;
+ struct dwc_qtd *qtd;
+
+ hc = hcd->hc_ptr_array[num];
+ hc_regs = hcd->core_if->host_if->hc_regs[num];
+ qtd = list_entry(hc->qh->qtd_list.next, struct dwc_qtd, qtd_list_entry);
+
+ hcint = dwc_reg_read(hc_regs, DWC_HCINT);
+ hcintmsk = dwc_reg_read(hc_regs, DWC_HCINTMSK);
+
+ hcint = hcint & hcintmsk;
+ if (!hcd->core_if->dma_enable && DWC_HCINT_CHAN_HALTED_RD(hcint)
+ && hcint != 0x2)
+ hcint = DWC_HCINT_CHAN_HALTED_RW(hcint, 0);
+
+ if (DWC_HCINT_TXFER_CMPL_RD(hcint)) {
+ retval |= handle_hc_xfercomp_intr(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 = DWC_HCINT_NYET_RESP_REC_RW(hcint, 0);
+ }
+
+ if (DWC_HCINT_CHAN_HALTED_RD(hcint))
+ retval |= handle_hc_chhltd_intr(hcd, hc, hc_regs,
+ qtd, &must_free);
+ if (DWC_HCINT_AHB_ERR_RD(hcint))
+ retval |= handle_hc_ahberr_intr(hcd, hc, hc_regs, qtd);
+ if (DWC_HCINT_STALL_RESP_REC_RD(hcint))
+ retval |= handle_hc_stall_intr(hcd, hc, hc_regs,
+ qtd, &must_free);
+ if (DWC_HCINT_NAK_RESP_REC_RD(hcint))
+ retval |= handle_hc_nak_intr(hcd, hc, hc_regs, qtd, &must_free);
+ if (DWC_HCINT_ACK_RESP_REC_RD(hcint))
+ retval |= handle_hc_ack_intr(hcd, hc, hc_regs, qtd, &must_free);
+ if (DWC_HCINT_NYET_RESP_REC_RD(hcint))
+ retval |= handle_hc_nyet_intr(hcd, hc, hc_regs,
+ qtd, &must_free);
+ if (DWC_HCINT_TRANS_ERR_RD(hcint))
+ retval |= handle_hc_xacterr_intr(hcd, hc, hc_regs,
+ qtd, &must_free);
+ if (DWC_HCINT_BBL_ERR_RD(hcint))
+ retval |= handle_hc_babble_intr(hcd, hc, hc_regs,
+ qtd, &must_free);
+ if (DWC_HCINT_FRAME_OVERN_ERR_RD(hcint))
+ retval |= handle_hc_frmovrun_intr(hcd, hc, hc_regs,
+ qtd, &must_free);
+ if (DWC_HCINT_DATA_TOG_ERR_RD(hcint))
+ retval |= handle_hc_datatglerr_intr(hcd, hc, hc_regs, qtd);
+
+ if (must_free)
+ /* Free the qtd here now that we are done using it. */
+ dwc_otg_hcd_qtd_free(qtd);
+ return retval;
+}
+
+/**
+ * This function returns the Host All Channel Interrupt register
+ */
+static inline u32 dwc_otg_read_host_all_channels_intr(struct core_if
+ *core_if)
+{
+ return dwc_reg_read(core_if->host_if->host_global_regs, DWC_HAINT);
+}
+
+/**
+ * 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 int dwc_otg_hcd_handle_hc_intr(struct dwc_hcd *hcd)
+{
+ u32 i;
+ int retval = 0;
+ u32 haint;
+
+ /*
+ * Clear appropriate bits in HCINTn to clear the interrupt bit in
+ * GINTSTS
+ */
+ haint = dwc_otg_read_host_all_channels_intr(hcd->core_if);
+ for (i = 0; i < hcd->core_if->core_params->host_channels; i++)
+ if (DWC_HAINT_RD(haint) & (1 << i))
+ retval |= dwc_otg_hcd_handle_hc_n_intr(hcd, i);
+
+ return retval;
+}
+
+/* This function handles interrupts for the HCD.*/
+int dwc_otg_hcd_handle_intr(struct dwc_hcd *hcd)
+{
+ int ret = 0;
+ struct core_if *core_if = hcd->core_if;
+ u32 gintsts;
+
+ /* Check if HOST Mode */
+ if (dwc_otg_is_host_mode(core_if)) {
+ spin_lock(&hcd->lock);
+ gintsts = dwc_otg_read_core_intr(core_if);
+ if (!gintsts) {
+ spin_unlock(&hcd->lock);
+ return IRQ_NONE;
+ }
+
+ if (gintsts & DWC_INTMSK_STRT_OF_FRM)
+ ret |= dwc_otg_hcd_handle_sof_intr(hcd);
+ if (gintsts & DWC_INTMSK_RXFIFO_NOT_EMPT)
+ ret |= dwc_otg_hcd_handle_rx_status_q_level_intr(hcd);
+ if (gintsts & DWC_INTMSK_NP_TXFIFO_EMPT)
+ ret |= dwc_otg_hcd_handle_np_tx_fifo_empty_intr(hcd);
+ if (gintsts & DWC_INTMSK_HST_PORT)
+ ret |= dwc_otg_hcd_handle_port_intr(hcd);
+ if (gintsts & DWC_INTMSK_HST_CHAN)
+ ret |= dwc_otg_hcd_handle_hc_intr(hcd);
+ if (gintsts & DWC_INTMSK_P_TXFIFO_EMPTY)
+ ret |= dwc_otg_hcd_handle_perio_tx_fifo_empty_intr(hcd);
+
+ spin_unlock(&hcd->lock);
+ }
+ return ret;
+}
--
1.7.0.4
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