This file contains code to support the HCD descriptor DMA mode of
the controller
Signed-off-by: Paul Zimmerman <pa...@synopsys.com>
Reviewed-by: Felipe Balbi <ba...@ti.com>
---
drivers/staging/dwc2/hcd_ddma.c | 1196 +++++++++++++++++++++++++++++++++++++++
1 file changed, 1196 insertions(+)
create mode 100644 drivers/staging/dwc2/hcd_ddma.c
diff --git a/drivers/staging/dwc2/hcd_ddma.c b/drivers/staging/dwc2/hcd_ddma.c
new file mode 100644
index 0000000..ab88f50
--- /dev/null
+++ b/drivers/staging/dwc2/hcd_ddma.c
@@ -0,0 +1,1196 @@
+/*
+ * hcd_ddma.c - DesignWare HS OTG Controller descriptor DMA routines
+ *
+ * Copyright (C) 2004-2013 Synopsys, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions, and the following disclaimer,
+ * without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ * to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option) any
+ * later version.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * This file contains the Descriptor DMA implementation for Host mode
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/usb.h>
+
+#include <linux/usb/hcd.h>
+#include <linux/usb/ch11.h>
+
+#include "core.h"
+#include "hcd.h"
+
+static u16 dwc2_frame_list_idx(u16 frame)
+{
+ return frame & (FRLISTEN_64_SIZE - 1);
+}
+
+static u16 dwc2_desclist_idx_inc(u16 idx, u16 inc, u8 speed)
+{
+ return (idx + inc) &
+ ((speed == USB_SPEED_HIGH ? MAX_DMA_DESC_NUM_HS_ISOC :
+ MAX_DMA_DESC_NUM_GENERIC) - 1);
+}
+
+static u16 dwc2_desclist_idx_dec(u16 idx, u16 inc, u8 speed)
+{
+ return (idx - inc) &
+ ((speed == USB_SPEED_HIGH ? MAX_DMA_DESC_NUM_HS_ISOC :
+ MAX_DMA_DESC_NUM_GENERIC) - 1);
+}
+
+static u16 dwc2_max_desc_num(struct dwc2_qh *qh)
+{
+ return (qh->ep_type == USB_ENDPOINT_XFER_ISOC &&
+ qh->dev_speed == USB_SPEED_HIGH) ?
+ MAX_DMA_DESC_NUM_HS_ISOC : MAX_DMA_DESC_NUM_GENERIC;
+}
+
+static u16 dwc2_frame_incr_val(struct dwc2_qh *qh)
+{
+ return qh->dev_speed == USB_SPEED_HIGH ?
+ (qh->interval + 8 - 1) / 8 : qh->interval;
+}
+
+static int dwc2_desc_list_alloc(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh,
+ gfp_t flags)
+{
+ qh->desc_list = dma_alloc_coherent(hsotg->dev,
+ sizeof(struct dwc2_hcd_dma_desc) *
+ dwc2_max_desc_num(qh), &qh->desc_list_dma,
+ flags);
+
+ if (!qh->desc_list)
+ return -ENOMEM;
+
+ memset(qh->desc_list, 0,
+ sizeof(struct dwc2_hcd_dma_desc) * dwc2_max_desc_num(qh));
+
+ qh->n_bytes = kzalloc(sizeof(u32) * dwc2_max_desc_num(qh), flags);
+ if (!qh->n_bytes) {
+ dma_free_coherent(hsotg->dev, sizeof(struct dwc2_hcd_dma_desc)
+ * dwc2_max_desc_num(qh), qh->desc_list,
+ qh->desc_list_dma);
+ qh->desc_list = NULL;
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static void dwc2_desc_list_free(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
+{
+ if (qh->desc_list) {
+ dma_free_coherent(hsotg->dev, sizeof(struct dwc2_hcd_dma_desc)
+ * dwc2_max_desc_num(qh), qh->desc_list,
+ qh->desc_list_dma);
+ qh->desc_list = NULL;
+ }
+
+ kfree(qh->n_bytes);
+ qh->n_bytes = NULL;
+}
+
+static int dwc2_frame_list_alloc(struct dwc2_hsotg *hsotg, gfp_t mem_flags)
+{
+ if (hsotg->frame_list)
+ return 0;
+
+ hsotg->frame_list = dma_alloc_coherent(hsotg->dev,
+ 4 * FRLISTEN_64_SIZE,
+ &hsotg->frame_list_dma,
+ mem_flags);
+ if (!hsotg->frame_list)
+ return -ENOMEM;
+
+ memset(hsotg->frame_list, 0, 4 * FRLISTEN_64_SIZE);
+ return 0;
+}
+
+static void dwc2_frame_list_free(struct dwc2_hsotg *hsotg)
+{
+ u32 *frame_list;
+ dma_addr_t frame_list_dma;
+ unsigned long flags;
+
+ spin_lock_irqsave(&hsotg->lock, flags);
+
+ if (!hsotg->frame_list) {
+ spin_unlock_irqrestore(&hsotg->lock, flags);
+ return;
+ }
+
+ frame_list = hsotg->frame_list;
+ frame_list_dma = hsotg->frame_list_dma;
+ hsotg->frame_list = NULL;
+
+ spin_unlock_irqrestore(&hsotg->lock, flags);
+
+ dma_free_coherent(hsotg->dev, 4 * FRLISTEN_64_SIZE, frame_list,
+ frame_list_dma);
+}
+
+static void dwc2_per_sched_enable(struct dwc2_hsotg *hsotg, u32 fr_list_en)
+{
+ u32 hcfg;
+ unsigned long flags;
+
+ spin_lock_irqsave(&hsotg->lock, flags);
+
+ hcfg = readl(hsotg->regs + HCFG);
+ if (hcfg & HCFG_PERSCHEDENA) {
+ /* already enabled */
+ spin_unlock_irqrestore(&hsotg->lock, flags);
+ return;
+ }
+
+ writel(hsotg->frame_list_dma, hsotg->regs + HFLBADDR);
+
+ hcfg &= ~HCFG_FRLISTEN_MASK;
+ hcfg |= fr_list_en | HCFG_PERSCHEDENA;
+ dev_vdbg(hsotg->dev, "Enabling Periodic schedule\n");
+ writel(hcfg, hsotg->regs + HCFG);
+
+ spin_unlock_irqrestore(&hsotg->lock, flags);
+}
+
+static void dwc2_per_sched_disable(struct dwc2_hsotg *hsotg)
+{
+ u32 hcfg;
+ unsigned long flags;
+
+ spin_lock_irqsave(&hsotg->lock, flags);
+
+ hcfg = readl(hsotg->regs + HCFG);
+ if (!(hcfg & HCFG_PERSCHEDENA)) {
+ /* already disabled */
+ spin_unlock_irqrestore(&hsotg->lock, flags);
+ return;
+ }
+
+ hcfg &= ~HCFG_PERSCHEDENA;
+ dev_vdbg(hsotg->dev, "Disabling Periodic schedule\n");
+ writel(hcfg, hsotg->regs + HCFG);
+
+ spin_unlock_irqrestore(&hsotg->lock, flags);
+}
+
+/*
+ * Activates/Deactivates FrameList entries for the channel based on endpoint
+ * servicing period
+ */
+static void dwc2_update_frame_list(struct dwc2_hsotg *hsotg, struct dwc2_qh
*qh,
+ int enable)
+{
+ struct dwc2_host_chan *chan;
+ u16 i, j, inc;
+
+ if (!qh->channel) {
+ dev_err(hsotg->dev, "qh->channel = %p", qh->channel);
+ return;
+ }
+
+ if (!hsotg) {
+ dev_err(hsotg->dev, "------hsotg = %p", hsotg);
+ return;
+ }
+
+ if (!hsotg->frame_list) {
+ dev_err(hsotg->dev, "-------hsotg->frame_list = %p",
+ hsotg->frame_list);
+ return;
+ }
+
+ chan = qh->channel;
+ inc = dwc2_frame_incr_val(qh);
+ if (qh->ep_type == USB_ENDPOINT_XFER_ISOC)
+ i = dwc2_frame_list_idx(qh->sched_frame);
+ else
+ i = 0;
+
+ j = i;
+ do {
+ if (enable)
+ hsotg->frame_list[j] |= 1 << chan->hc_num;
+ else
+ hsotg->frame_list[j] &= ~(1 << chan->hc_num);
+ j = (j + inc) & (FRLISTEN_64_SIZE - 1);
+ } while (j != i);
+
+ if (!enable)
+ return;
+
+ chan->schinfo = 0;
+ if (chan->speed == USB_SPEED_HIGH && qh->interval) {
+ j = 1;
+ /* TODO - check this */
+ inc = (8 + qh->interval - 1) / qh->interval;
+ for (i = 0; i < inc; i++) {
+ chan->schinfo |= j;
+ j = j << qh->interval;
+ }
+ } else {
+ chan->schinfo = 0xff;
+ }
+}
+
+static void dwc2_release_channel_ddma(struct dwc2_hsotg *hsotg,
+ struct dwc2_qh *qh)
+{
+ struct dwc2_host_chan *chan = qh->channel;
+
+ if (dwc2_qh_is_non_per(qh))
+ hsotg->non_periodic_channels--;
+ else
+ dwc2_update_frame_list(hsotg, qh, 0);
+
+ /*
+ * The condition is added to prevent double cleanup try in case of
+ * device disconnect. See channel cleanup in dwc2_hcd_disconnect().
+ */
+ if (chan->qh) {
+ if (!list_empty(&chan->hc_list_entry))
+ list_del(&chan->hc_list_entry);
+ dwc2_hc_cleanup(hsotg, chan);
+ list_add_tail(&chan->hc_list_entry, &hsotg->free_hc_list);
+ chan->qh = NULL;
+ }
+
+ qh->channel = NULL;
+ qh->ntd = 0;
+
+ if (qh->desc_list)
+ memset(qh->desc_list, 0, sizeof(struct dwc2_hcd_dma_desc) *
+ dwc2_max_desc_num(qh));
+}
+
+/**
+ * dwc2_hcd_qh_init_ddma() - Initializes a QH structure's Descriptor DMA
+ * related members
+ *
+ * @hsotg: The HCD state structure for the DWC OTG controller
+ * @qh: The QH to init
+ *
+ * Return: 0 if successful, negative error code otherwise
+ *
+ * Allocates memory for the descriptor list. For the first periodic QH,
+ * allocates memory for the FrameList and enables periodic scheduling.
+ */
+int dwc2_hcd_qh_init_ddma(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh,
+ gfp_t mem_flags)
+{
+ int retval;
+
+ if (qh->do_split) {
+ dev_err(hsotg->dev,
+ "SPLIT Transfers are not supported in Descriptor DMA
mode.\n");
+ retval = -EINVAL;
+ goto err0;
+ }
+
+ retval = dwc2_desc_list_alloc(hsotg, qh, mem_flags);
+ if (retval)
+ goto err0;
+
+ if (qh->ep_type == USB_ENDPOINT_XFER_ISOC ||
+ qh->ep_type == USB_ENDPOINT_XFER_INT) {
+ if (!hsotg->frame_list) {
+ retval = dwc2_frame_list_alloc(hsotg, mem_flags);
+ if (retval)
+ goto err1;
+ /* Enable periodic schedule on first periodic QH */
+ dwc2_per_sched_enable(hsotg, HCFG_FRLISTEN_64);
+ }
+ }
+
+ qh->ntd = 0;
+ return 0;
+
+err1:
+ dwc2_desc_list_free(hsotg, qh);
+err0:
+ return retval;
+}
+
+/**
+ * dwc2_hcd_qh_free_ddma() - Frees a QH structure's Descriptor DMA related
+ * members
+ *
+ * @hsotg: The HCD state structure for the DWC OTG controller
+ * @qh: The QH to free
+ *
+ * Frees descriptor list memory associated with the QH. If QH is periodic and
+ * the last, frees FrameList memory and disables periodic scheduling.
+ */
+void dwc2_hcd_qh_free_ddma(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
+{
+ dwc2_desc_list_free(hsotg, qh);
+
+ /*
+ * Channel still assigned due to some reasons.
+ * Seen on Isoc URB dequeue. Channel halted but no subsequent
+ * ChHalted interrupt to release the channel. Afterwards
+ * when it comes here from endpoint disable routine
+ * channel remains assigned.
+ */
+ if (qh->channel)
+ dwc2_release_channel_ddma(hsotg, qh);
+
+ if ((qh->ep_type == USB_ENDPOINT_XFER_ISOC ||
+ qh->ep_type == USB_ENDPOINT_XFER_INT) &&
+ !hsotg->periodic_channels && hsotg->frame_list) {
+ dwc2_per_sched_disable(hsotg);
+ dwc2_frame_list_free(hsotg);
+ }
+}
+
+static u8 dwc2_frame_to_desc_idx(struct dwc2_qh *qh, u16 frame_idx)
+{
+ if (qh->dev_speed == USB_SPEED_HIGH)
+ /* Descriptor set (8 descriptors) index which is 8-aligned */
+ return (frame_idx & ((MAX_DMA_DESC_NUM_HS_ISOC / 8) - 1)) * 8;
+ else
+ return frame_idx & (MAX_DMA_DESC_NUM_GENERIC - 1);
+}
+
+/*
+ * Determine starting frame for Isochronous transfer.
+ * Few frames skipped to prevent race condition with HC.
+ */
+static u16 dwc2_calc_starting_frame(struct dwc2_hsotg *hsotg,
+ struct dwc2_qh *qh, u16 *skip_frames)
+{
+ u16 frame;
+
+ hsotg->frame_number = dwc2_hcd_get_frame_number(hsotg);
+
+ /* sched_frame is always frame number (not uFrame) both in FS and HS! */
+
+ /*
+ * skip_frames is used to limit activated descriptors number
+ * to avoid the situation when HC services the last activated
+ * descriptor firstly.
+ * Example for FS:
+ * Current frame is 1, scheduled frame is 3. Since HC always fetches
+ * the descriptor corresponding to curr_frame+1, the descriptor
+ * corresponding to frame 2 will be fetched. If the number of
+ * descriptors is max=64 (or greather) the list will be fully programmed
+ * with Active descriptors and it is possible case (rare) that the
+ * latest descriptor(considering rollback) corresponding to frame 2 will
+ * be serviced first. HS case is more probable because, in fact, up to
+ * 11 uframes (16 in the code) may be skipped.
+ */
+ if (qh->dev_speed == USB_SPEED_HIGH) {
+ /*
+ * Consider uframe counter also, to start xfer asap. If half of
+ * the frame elapsed skip 2 frames otherwise just 1 frame.
+ * Starting descriptor index must be 8-aligned, so if the
+ * current frame is near to complete the next one is skipped as
+ * well.
+ */
+ if (dwc2_micro_frame_num(hsotg->frame_number) >= 5) {
+ *skip_frames = 2 * 8;
+ frame = dwc2_frame_num_inc(hsotg->frame_number,
+ *skip_frames);
+ } else {
+ *skip_frames = 1 * 8;
+ frame = dwc2_frame_num_inc(hsotg->frame_number,
+ *skip_frames);
+ }
+
+ frame = dwc2_full_frame_num(frame);
+ } else {
+ /*
+ * Two frames are skipped for FS - the current and the next.
+ * But for descriptor programming, 1 frame (descriptor) is
+ * enough, see example above.
+ */
+ *skip_frames = 1;
+ frame = dwc2_frame_num_inc(hsotg->frame_number, 2);
+ }
+
+ return frame;
+}
+
+/*
+ * Calculate initial descriptor index for isochronous transfer based on
+ * scheduled frame
+ */
+static u16 dwc2_recalc_initial_desc_idx(struct dwc2_hsotg *hsotg,
+ struct dwc2_qh *qh)
+{
+ u16 frame, fr_idx, fr_idx_tmp, skip_frames;
+
+ /*
+ * With current ISOC processing algorithm the channel is being released
+ * when no more QTDs in the list (qh->ntd == 0). Thus this function is
+ * called only when qh->ntd == 0 and qh->channel == 0.
+ *
+ * So qh->channel != NULL branch is not used and just not removed from
+ * the source file. It is required for another possible approach which
+ * is, do not disable and release the channel when ISOC session
+ * completed, just move QH to inactive schedule until new QTD arrives.
+ * On new QTD, the QH moved back to 'ready' schedule, starting frame and
+ * therefore starting desc_index are recalculated. In this case channel
+ * is released only on ep_disable.
+ */
+
+ /*
+ * Calculate starting descriptor index. For INTERRUPT endpoint it is
+ * always 0.
+ */
+ if (qh->channel) {
+ frame = dwc2_calc_starting_frame(hsotg, qh, &skip_frames);
+ /*
+ * Calculate initial descriptor index based on FrameList current
+ * bitmap and servicing period
+ */
+ fr_idx_tmp = dwc2_frame_list_idx(frame);
+ fr_idx = (FRLISTEN_64_SIZE +
+ dwc2_frame_list_idx(qh->sched_frame) - fr_idx_tmp)
+ % dwc2_frame_incr_val(qh);
+ fr_idx = (fr_idx + fr_idx_tmp) % FRLISTEN_64_SIZE;
+ } else {
+ qh->sched_frame = dwc2_calc_starting_frame(hsotg, qh,
+ &skip_frames);
+ fr_idx = dwc2_frame_list_idx(qh->sched_frame);
+ }
+
+ qh->td_first = qh->td_last = dwc2_frame_to_desc_idx(qh, fr_idx);
+
+ return skip_frames;
+}
+
+#define ISOC_URB_GIVEBACK_ASAP
+
+#define MAX_ISOC_XFER_SIZE_FS 1023
+#define MAX_ISOC_XFER_SIZE_HS 3072
+#define DESCNUM_THRESHOLD 4
+
+static void dwc2_fill_host_isoc_dma_desc(struct dwc2_hsotg *hsotg,
+ struct dwc2_qtd *qtd,
+ struct dwc2_qh *qh, u32 max_xfer_size,
+ u16 idx)
+{
+ struct dwc2_hcd_dma_desc *dma_desc = &qh->desc_list[idx];
+ struct dwc2_hcd_iso_packet_desc *frame_desc;
+
+ memset(dma_desc, 0, sizeof(*dma_desc));
+ frame_desc = &qtd->urb->iso_descs[qtd->isoc_frame_index_last];
+
+ if (frame_desc->length > max_xfer_size)
+ qh->n_bytes[idx] = max_xfer_size;
+ else
+ qh->n_bytes[idx] = frame_desc->length;
+
+ dma_desc->buf = (u32)(qtd->urb->dma + frame_desc->offset);
+ dma_desc->status = qh->n_bytes[idx] << HOST_DMA_ISOC_NBYTES_SHIFT &
+ HOST_DMA_ISOC_NBYTES_MASK;
+
+#ifdef ISOC_URB_GIVEBACK_ASAP
+ /* Set IOC for each descriptor corresponding to last frame of URB */
+ if (qtd->isoc_frame_index_last == qtd->urb->packet_count)
+ dma_desc->status |= HOST_DMA_IOC;
+#endif
+
+ qh->ntd++;
+ qtd->isoc_frame_index_last++;
+}
+
+static void dwc2_init_isoc_dma_desc(struct dwc2_hsotg *hsotg,
+ struct dwc2_qh *qh, u16 skip_frames)
+{
+ struct dwc2_qtd *qtd;
+ u32 max_xfer_size;
+ u16 idx, inc, n_desc, ntd_max = 0;
+
+ idx = qh->td_last;
+ inc = qh->interval;
+ n_desc = 0;
+
+ if (qh->interval) {
+ ntd_max = (dwc2_max_desc_num(qh) + qh->interval - 1) /
+ qh->interval;
+ if (skip_frames && !qh->channel)
+ ntd_max -= skip_frames / qh->interval;
+ }
+
+ max_xfer_size = qh->dev_speed == USB_SPEED_HIGH ?
+ MAX_ISOC_XFER_SIZE_HS : MAX_ISOC_XFER_SIZE_FS;
+
+ list_for_each_entry(qtd, &qh->qtd_list, qtd_list_entry) {
+ while (qh->ntd < ntd_max && qtd->isoc_frame_index_last <
+ qtd->urb->packet_count) {
+ if (n_desc > 1)
+ qh->desc_list[n_desc - 1].status |= HOST_DMA_A;
+ dwc2_fill_host_isoc_dma_desc(hsotg, qtd, qh,
+ max_xfer_size, idx);
+ idx = dwc2_desclist_idx_inc(idx, inc, qh->dev_speed);
+ n_desc++;
+ }
+ qtd->in_process = 1;
+ }
+
+ qh->td_last = idx;
+
+#ifdef ISOC_URB_GIVEBACK_ASAP
+ /* Set IOC for last descriptor if descriptor list is full */
+ if (qh->ntd == ntd_max) {
+ idx = dwc2_desclist_idx_dec(qh->td_last, inc, qh->dev_speed);
+ qh->desc_list[idx].status |= HOST_DMA_IOC;
+ }
+#else
+ /*
+ * Set IOC bit only for one descriptor. Always try to be ahead of HW
+ * processing, i.e. on IOC generation driver activates next descriptor
+ * but core continues to process descriptors following the one with IOC
+ * set.
+ */
+
+ if (n_desc > DESCNUM_THRESHOLD)
+ /*
+ * Move IOC "up". Required even if there is only one QTD
+ * in the list, because QTDs might continue to be queued,
+ * but during the activation it was only one queued.
+ * Actually more than one QTD might be in the list if this
+ * function called from XferCompletion - QTDs was queued during
+ * HW processing of the previous descriptor chunk.
+ */
+ idx = dwc2_desclist_idx_dec(idx, inc * ((qh->ntd + 1) / 2),
+ qh->dev_speed);
+ else
+ /*
+ * Set the IOC for the latest descriptor if either number of
+ * descriptors is not greater than threshold or no more new
+ * descriptors activated
+ */
+ idx = dwc2_desclist_idx_dec(qh->td_last, inc, qh->dev_speed);
+
+ qh->desc_list[idx].status |= HOST_DMA_IOC;
+#endif
+
+ if (n_desc) {
+ qh->desc_list[n_desc - 1].status |= HOST_DMA_A;
+ if (n_desc > 1)
+ qh->desc_list[0].status |= HOST_DMA_A;
+ }
+}
+
+static void dwc2_fill_host_dma_desc(struct dwc2_hsotg *hsotg,
+ struct dwc2_host_chan *chan,
+ struct dwc2_qtd *qtd, struct dwc2_qh *qh,
+ int n_desc)
+{
+ struct dwc2_hcd_dma_desc *dma_desc = &qh->desc_list[n_desc];
+ int len = chan->xfer_len;
+
+ if (len > MAX_DMA_DESC_SIZE)
+ len = MAX_DMA_DESC_SIZE - chan->max_packet + 1;
+
+ if (chan->ep_is_in) {
+ int num_packets;
+
+ if (len > 0 && chan->max_packet)
+ num_packets = (len + chan->max_packet - 1)
+ / chan->max_packet;
+ else
+ /* Need 1 packet for transfer length of 0 */
+ num_packets = 1;
+
+ /* Always program an integral # of packets for IN transfers */
+ len = num_packets * chan->max_packet;
+ }
+
+ dma_desc->status = len << HOST_DMA_NBYTES_SHIFT & HOST_DMA_NBYTES_MASK;
+ qh->n_bytes[n_desc] = len;
+
+ if (qh->ep_type == USB_ENDPOINT_XFER_CONTROL &&
+ qtd->control_phase == DWC2_CONTROL_SETUP)
+ dma_desc->status |= HOST_DMA_SUP;
+
+ dma_desc->buf = (u32)chan->xfer_dma;
+
+ /*
+ * Last (or only) descriptor of IN transfer with actual size less
+ * than MaxPacket
+ */
+ if (len > chan->xfer_len) {
+ chan->xfer_len = 0;
+ } else {
+ chan->xfer_dma += len;
+ chan->xfer_len -= len;
+ }
+}
+
+static void dwc2_init_non_isoc_dma_desc(struct dwc2_hsotg *hsotg,
+ struct dwc2_qh *qh)
+{
+ struct dwc2_qtd *qtd;
+ struct dwc2_host_chan *chan = qh->channel;
+ int n_desc = 0;
+
+ dev_vdbg(hsotg->dev, "%s(): qh=%p dma=%08lx len=%d\n", __func__, qh,
+ (unsigned long)chan->xfer_dma, chan->xfer_len);
+
+ /*
+ * Start with chan->xfer_dma initialized in assign_and_init_hc(), then
+ * if SG transfer consists of multiple URBs, this pointer is re-assigned
+ * to the buffer of the currently processed QTD. For non-SG request
+ * there is always one QTD active.
+ */
+
+ list_for_each_entry(qtd, &qh->qtd_list, qtd_list_entry) {
+ dev_vdbg(hsotg->dev, "qtd=%p\n", qtd);
+
+ if (n_desc) {
+ /* SG request - more than 1 QTD */
+ chan->xfer_dma = qtd->urb->dma +
+ qtd->urb->actual_length;
+ chan->xfer_len = qtd->urb->length -
+ qtd->urb->actual_length;
+ dev_vdbg(hsotg->dev, "buf=%08lx len=%d\n",
+ (unsigned long)chan->xfer_dma, chan->xfer_len);
+ }
+
+ qtd->n_desc = 0;
+ do {
+ if (n_desc > 1) {
+ qh->desc_list[n_desc - 1].status |= HOST_DMA_A;
+ dev_vdbg(hsotg->dev,
+ "set A bit in desc %d (%p)\n",
+ n_desc - 1,
+ &qh->desc_list[n_desc - 1]);
+ }
+ dwc2_fill_host_dma_desc(hsotg, chan, qtd, qh, n_desc);
+ dev_vdbg(hsotg->dev,
+ "desc %d (%p) buf=%08x status=%08x\n",
+ n_desc, &qh->desc_list[n_desc],
+ qh->desc_list[n_desc].buf,
+ qh->desc_list[n_desc].status);
+ qtd->n_desc++;
+ n_desc++;
+ } while (chan->xfer_len > 0 &&
+ n_desc != MAX_DMA_DESC_NUM_GENERIC);
+
+ dev_vdbg(hsotg->dev, "n_desc=%d\n", n_desc);
+ qtd->in_process = 1;
+ if (qh->ep_type == USB_ENDPOINT_XFER_CONTROL)
+ break;
+ if (n_desc == MAX_DMA_DESC_NUM_GENERIC)
+ break;
+ }
+
+ if (n_desc) {
+ qh->desc_list[n_desc - 1].status |=
+ HOST_DMA_IOC | HOST_DMA_EOL | HOST_DMA_A;
+ dev_vdbg(hsotg->dev, "set IOC/EOL/A bits in desc %d (%p)\n",
+ n_desc - 1, &qh->desc_list[n_desc - 1]);
+ if (n_desc > 1) {
+ qh->desc_list[0].status |= HOST_DMA_A;
+ dev_vdbg(hsotg->dev, "set A bit in desc 0 (%p)\n",
+ &qh->desc_list[0]);
+ }
+ chan->ntd = n_desc;
+ }
+}
+
+/**
+ * dwc2_hcd_start_xfer_ddma() - Starts a transfer in Descriptor DMA mode
+ *
+ * @hsotg: The HCD state structure for the DWC OTG controller
+ * @qh: The QH to init
+ *
+ * Return: 0 if successful, negative error code otherwise
+ *
+ * For Control and Bulk endpoints, initializes descriptor list and starts the
+ * transfer. For Interrupt and Isochronous endpoints, initializes descriptor
+ * list then updates FrameList, marking appropriate entries as active.
+ *
+ * For Isochronous endpoints the starting descriptor index is calculated based
+ * on the scheduled frame, but only on the first transfer descriptor within a
+ * session. Then the transfer is started via enabling the channel.
+ *
+ * For Isochronous endpoints the channel is not halted on XferComplete
+ * interrupt so remains assigned to the endpoint(QH) until session is done.
+ */
+void dwc2_hcd_start_xfer_ddma(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
+{
+ /* Channel is already assigned */
+ struct dwc2_host_chan *chan = qh->channel;
+ u16 skip_frames = 0;
+
+ switch (chan->ep_type) {
+ case USB_ENDPOINT_XFER_CONTROL:
+ case USB_ENDPOINT_XFER_BULK:
+ dwc2_init_non_isoc_dma_desc(hsotg, qh);
+ dwc2_hc_start_transfer_ddma(hsotg, chan);
+ break;
+ case USB_ENDPOINT_XFER_INT:
+ dwc2_init_non_isoc_dma_desc(hsotg, qh);
+ dwc2_update_frame_list(hsotg, qh, 1);
+ dwc2_hc_start_transfer_ddma(hsotg, chan);
+ break;
+ case USB_ENDPOINT_XFER_ISOC:
+ if (!qh->ntd)
+ skip_frames = dwc2_recalc_initial_desc_idx(hsotg, qh);
+ dwc2_init_isoc_dma_desc(hsotg, qh, skip_frames);
+
+ if (!chan->xfer_started) {
+ dwc2_update_frame_list(hsotg, qh, 1);
+
+ /*
+ * Always set to max, instead of actual size. Otherwise
+ * ntd will be changed with channel being enabled. Not
+ * recommended.
+ */
+ chan->ntd = dwc2_max_desc_num(qh);
+
+ /* Enable channel only once for ISOC */
+ dwc2_hc_start_transfer_ddma(hsotg, chan);
+ }
+
+ break;
+ default:
+ break;
+ }
+}
+
+#define DWC2_CMPL_DONE 1
+#define DWC2_CMPL_STOP 2
+
+static int dwc2_cmpl_host_isoc_dma_desc(struct dwc2_hsotg *hsotg,
+ struct dwc2_host_chan *chan,
+ struct dwc2_qtd *qtd,
+ struct dwc2_qh *qh, u16 idx)
+{
+ struct dwc2_hcd_dma_desc *dma_desc = &qh->desc_list[idx];
+ struct dwc2_hcd_iso_packet_desc *frame_desc;
+ u16 remain = 0;
+ int rc = 0;
+
+ frame_desc = &qtd->urb->iso_descs[qtd->isoc_frame_index_last];
+ dma_desc->buf = (u32)(qtd->urb->dma + frame_desc->offset);
+ if (chan->ep_is_in)
+ remain = dma_desc->status >> HOST_DMA_ISOC_NBYTES_SHIFT &
+ HOST_DMA_ISOC_NBYTES_MASK >> HOST_DMA_ISOC_NBYTES_SHIFT;
+
+ if ((dma_desc->status & HOST_DMA_STS_MASK) == HOST_DMA_STS_PKTERR) {
+ /*
+ * XactError, or unable to complete all the transactions
+ * in the scheduled micro-frame/frame, both indicated by
+ * HOST_DMA_STS_PKTERR
+ */
+ qtd->urb->error_count++;
+ frame_desc->actual_length = qh->n_bytes[idx] - remain;
+ frame_desc->status = -EPROTO;
+ } else {
+ /* Success */
+ frame_desc->actual_length = qh->n_bytes[idx] - remain;
+ frame_desc->status = 0;
+ }
+
+ if (++qtd->isoc_frame_index == qtd->urb->packet_count) {
+ /*
+ * urb->status is not used for isoc transfers here. The
+ * individual frame_desc status are used instead.
+ */
+ dwc2_host_complete(hsotg, qtd->urb->priv, qtd->urb, 0);
+ dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh);
+
+ /*
+ * This check is necessary because urb_dequeue can be called
+ * from urb complete callback (sound driver for example). All
+ * pending URBs are dequeued there, so no need for further
+ * processing.
+ */
+ if (chan->halt_status == DWC2_HC_XFER_URB_DEQUEUE)
+ return -1;
+ rc = DWC2_CMPL_DONE;
+ }
+
+ qh->ntd--;
+
+ /* Stop if IOC requested descriptor reached */
+ if (dma_desc->status & HOST_DMA_IOC)
+ rc = DWC2_CMPL_STOP;
+
+ return rc;
+}
+
+static void dwc2_complete_isoc_xfer_ddma(struct dwc2_hsotg *hsotg,
+ struct dwc2_host_chan *chan,
+ enum dwc2_halt_status halt_status)
+{
+ struct dwc2_hcd_iso_packet_desc *frame_desc;
+ struct dwc2_qtd *qtd, *qtd_tmp;
+ struct dwc2_qh *qh;
+ u16 idx;
+ int rc;
+
+ qh = chan->qh;
+ idx = qh->td_first;
+
+ if (chan->halt_status == DWC2_HC_XFER_URB_DEQUEUE) {
+ list_for_each_entry(qtd, &qh->qtd_list, qtd_list_entry)
+ qtd->in_process = 0;
+ return;
+ }
+
+ if (halt_status == DWC2_HC_XFER_AHB_ERR ||
+ halt_status == DWC2_HC_XFER_BABBLE_ERR) {
+ /*
+ * Channel is halted in these error cases, considered as serious
+ * issues.
+ * Complete all URBs marking all frames as failed, irrespective
+ * whether some of the descriptors (frames) succeeded or not.
+ * Pass error code to completion routine as well, to update
+ * urb->status, some of class drivers might use it to stop
+ * queing transfer requests.
+ */
+ int err = halt_status == DWC2_HC_XFER_AHB_ERR ?
+ -EIO : -EOVERFLOW;
+
+ list_for_each_entry_safe(qtd, qtd_tmp, &qh->qtd_list,
+ qtd_list_entry) {
+ for (idx = 0; idx < qtd->urb->packet_count; idx++) {
+ frame_desc = &qtd->urb->iso_descs[idx];
+ frame_desc->status = err;
+ }
+
+ dwc2_host_complete(hsotg, qtd->urb->priv, qtd->urb,
+ err);
+ dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh);
+ }
+
+ return;
+ }
+
+ list_for_each_entry_safe(qtd, qtd_tmp, &qh->qtd_list, qtd_list_entry) {
+ if (!qtd->in_process)
+ break;
+ do {
+ rc = dwc2_cmpl_host_isoc_dma_desc(hsotg, chan, qtd, qh,
+ idx);
+ if (rc < 0)
+ return;
+ idx = dwc2_desclist_idx_inc(idx, qh->interval,
+ chan->speed);
+ if (rc == DWC2_CMPL_STOP)
+ goto stop_scan;
+ if (rc == DWC2_CMPL_DONE)
+ break;
+ } while (idx != qh->td_first);
+ }
+
+stop_scan:
+ qh->td_first = idx;
+}
+
+static int dwc2_update_non_isoc_urb_state_ddma(struct dwc2_hsotg *hsotg,
+ struct dwc2_host_chan *chan,
+ struct dwc2_qtd *qtd,
+ struct dwc2_hcd_dma_desc *dma_desc,
+ enum dwc2_halt_status halt_status,
+ u32 n_bytes, int *xfer_done)
+{
+ struct dwc2_hcd_urb *urb = qtd->urb;
+ u16 remain = 0;
+
+ if (chan->ep_is_in)
+ remain = dma_desc->status >> HOST_DMA_NBYTES_SHIFT &
+ HOST_DMA_NBYTES_MASK >> HOST_DMA_NBYTES_SHIFT;
+
+ dev_vdbg(hsotg->dev, "remain=%d dwc2_urb=%p\n", remain, urb);
+
+ if (halt_status == DWC2_HC_XFER_AHB_ERR) {
+ dev_err(hsotg->dev, "EIO\n");
+ urb->status = -EIO;
+ return 1;
+ }
+
+ if ((dma_desc->status & HOST_DMA_STS_MASK) == HOST_DMA_STS_PKTERR) {
+ switch (halt_status) {
+ case DWC2_HC_XFER_STALL:
+ dev_vdbg(hsotg->dev, "Stall\n");
+ urb->status = -EPIPE;
+ break;
+ case DWC2_HC_XFER_BABBLE_ERR:
+ dev_err(hsotg->dev, "Babble\n");
+ urb->status = -EOVERFLOW;
+ break;
+ case DWC2_HC_XFER_XACT_ERR:
+ dev_err(hsotg->dev, "XactErr\n");
+ urb->status = -EPROTO;
+ break;
+ default:
+ dev_err(hsotg->dev,
+ "%s: Unhandled descriptor error status (%d)\n",
+ __func__, halt_status);
+ break;
+ }
+ return 1;
+ }
+
+ if (dma_desc->status & HOST_DMA_A) {
+ dev_vdbg(hsotg->dev,
+ "Active descriptor encountered on channel %d\n",
+ chan->hc_num);
+ return 0;
+ }
+
+ if (chan->ep_type == USB_ENDPOINT_XFER_CONTROL) {
+ if (qtd->control_phase == DWC2_CONTROL_DATA) {
+ urb->actual_length += n_bytes - remain;
+ if (remain || urb->actual_length >= urb->length) {
+ /*
+ * For Control Data stage do not set urb->status
+ * to 0, to prevent URB callback. Set it when
+ * Status phase is done. See below.
+ */
+ *xfer_done = 1;
+ }
+ } else if (qtd->control_phase == DWC2_CONTROL_STATUS) {
+ urb->status = 0;
+ *xfer_done = 1;
+ }
+ /* No handling for SETUP stage */
+ } else {
+ /* BULK and INTR */
+ urb->actual_length += n_bytes - remain;
+ dev_vdbg(hsotg->dev, "length=%d actual=%d\n", urb->length,
+ urb->actual_length);
+ if (remain || urb->actual_length >= urb->length) {
+ urb->status = 0;
+ *xfer_done = 1;
+ }
+ }
+
+ return 0;
+}
+
+static int dwc2_process_non_isoc_desc(struct dwc2_hsotg *hsotg,
+ struct dwc2_host_chan *chan,
+ int chnum, struct dwc2_qtd *qtd,
+ int desc_num,
+ enum dwc2_halt_status halt_status,
+ int *xfer_done)
+{
+ struct dwc2_qh *qh = chan->qh;
+ struct dwc2_hcd_urb *urb = qtd->urb;
+ struct dwc2_hcd_dma_desc *dma_desc;
+ u32 n_bytes;
+ int failed;
+
+ dev_vdbg(hsotg->dev, "%s()\n", __func__);
+
+ dma_desc = &qh->desc_list[desc_num];
+ n_bytes = qh->n_bytes[desc_num];
+ dev_vdbg(hsotg->dev,
+ "qtd=%p dwc2_urb=%p desc_num=%d desc=%p n_bytes=%d\n",
+ qtd, urb, desc_num, dma_desc, n_bytes);
+ failed = dwc2_update_non_isoc_urb_state_ddma(hsotg, chan, qtd, dma_desc,
+ halt_status, n_bytes,
+ xfer_done);
+ if (failed || (*xfer_done && urb->status != -EINPROGRESS)) {
+ dwc2_host_complete(hsotg, urb->priv, urb, urb->status);
+ dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh);
+ dev_vdbg(hsotg->dev, "failed=%1x xfer_done=%1x status=%08x\n",
+ failed, *xfer_done, urb->status);
+ return failed;
+ }
+
+ if (qh->ep_type == USB_ENDPOINT_XFER_CONTROL) {
+ switch (qtd->control_phase) {
+ case DWC2_CONTROL_SETUP:
+ if (urb->length > 0)
+ qtd->control_phase = DWC2_CONTROL_DATA;
+ else
+ qtd->control_phase = DWC2_CONTROL_STATUS;
+ dev_vdbg(hsotg->dev,
+ " Control setup transaction done\n");
+ break;
+ case DWC2_CONTROL_DATA:
+ if (*xfer_done) {
+ qtd->control_phase = DWC2_CONTROL_STATUS;
+ dev_vdbg(hsotg->dev,
+ " Control data transfer done\n");
+ } else if (desc_num + 1 == qtd->n_desc) {
+ /*
+ * Last descriptor for Control data stage which
+ * is not completed yet
+ */
+ dwc2_hcd_save_data_toggle(hsotg, chan, chnum,
+ qtd);
+ }
+ break;
+ default:
+ break;
+ }
+ }
+
+ return 0;
+}
+
+static void dwc2_complete_non_isoc_xfer_ddma(struct dwc2_hsotg *hsotg,
+ struct dwc2_host_chan *chan,
+ int chnum,
+ enum dwc2_halt_status halt_status)
+{
+ struct list_head *qtd_item, *qtd_tmp;
+ struct dwc2_qh *qh = chan->qh;
+ struct dwc2_qtd *qtd = NULL;
+ int xfer_done;
+ int desc_num = 0;
+
+ if (chan->halt_status == DWC2_HC_XFER_URB_DEQUEUE) {
+ list_for_each_entry(qtd, &qh->qtd_list, qtd_list_entry)
+ qtd->in_process = 0;
+ return;
+ }
+
+ list_for_each_safe(qtd_item, qtd_tmp, &qh->qtd_list) {
+ int i;
+
+ qtd = list_entry(qtd_item, struct dwc2_qtd, qtd_list_entry);
+ xfer_done = 0;
+
+ for (i = 0; i < qtd->n_desc; i++) {
+ if (dwc2_process_non_isoc_desc(hsotg, chan, chnum, qtd,
+ desc_num, halt_status,
+ &xfer_done))
+ break;
+ desc_num++;
+ }
+ }
+
+ if (qh->ep_type != USB_ENDPOINT_XFER_CONTROL) {
+ /*
+ * Resetting the data toggle for bulk and interrupt endpoints
+ * in case of stall. See handle_hc_stall_intr().
+ */
+ if (halt_status == DWC2_HC_XFER_STALL)
+ qh->data_toggle = DWC2_HC_PID_DATA0;
+ else if (qtd)
+ dwc2_hcd_save_data_toggle(hsotg, chan, chnum, qtd);
+ }
+
+ if (halt_status == DWC2_HC_XFER_COMPLETE) {
+ if (chan->hcint & HCINTMSK_NYET) {
+ /*
+ * Got a NYET on the last transaction of the transfer.
+ * It means that the endpoint should be in the PING
+ * state at the beginning of the next transfer.
+ */
+ qh->ping_state = 1;
+ }
+ }
+}
+
+/**
+ * dwc2_hcd_complete_xfer_ddma() - Scans the descriptor list, updates URB's
+ * status and calls completion routine for the URB if it's done. Called from
+ * interrupt handlers.
+ *
+ * @hsotg: The HCD state structure for the DWC OTG controller
+ * @chan: Host channel the transfer is completed on
+ * @chnum: Index of Host channel registers
+ * @halt_status: Reason the channel is being halted or just XferComplete
+ * for isochronous transfers
+ *
+ * Releases the channel to be used by other transfers.
+ * In case of Isochronous endpoint the channel is not halted until the end of
+ * the session, i.e. QTD list is empty.
+ * If periodic channel released the FrameList is updated accordingly.
+ * Calls transaction selection routines to activate pending transfers.
+ */
+void dwc2_hcd_complete_xfer_ddma(struct dwc2_hsotg *hsotg,
+ struct dwc2_host_chan *chan, int chnum,
+ enum dwc2_halt_status halt_status)
+{
+ struct dwc2_qh *qh = chan->qh;
+ int continue_isoc_xfer = 0;
+ enum dwc2_transaction_type tr_type;
+
+ if (chan->ep_type == USB_ENDPOINT_XFER_ISOC) {
+ dwc2_complete_isoc_xfer_ddma(hsotg, chan, halt_status);
+
+ /* Release the channel if halted or session completed */
+ if (halt_status != DWC2_HC_XFER_COMPLETE ||
+ list_empty(&qh->qtd_list)) {
+ /* Halt the channel if session completed */
+ if (halt_status == DWC2_HC_XFER_COMPLETE)
+ dwc2_hc_halt(hsotg, chan, halt_status);
+ dwc2_release_channel_ddma(hsotg, qh);
+ dwc2_hcd_qh_unlink(hsotg, qh);
+ } else {
+ /* Keep in assigned schedule to continue transfer */
+ list_move(&qh->qh_list_entry,
+ &hsotg->periodic_sched_assigned);
+ continue_isoc_xfer = 1;
+ }
+ /*
+ * Todo: Consider the case when period exceeds FrameList size.
+ * Frame Rollover interrupt should be used.
+ */
+ } else {
+ /*
+ * Scan descriptor list to complete the URB(s), then release
+ * the channel
+ */
+ dwc2_complete_non_isoc_xfer_ddma(hsotg, chan, chnum,
+ halt_status);
+ dwc2_release_channel_ddma(hsotg, qh);
+ dwc2_hcd_qh_unlink(hsotg, qh);
+
+ if (!list_empty(&qh->qtd_list)) {
+ /*
+ * Add back to inactive non-periodic schedule on normal
+ * completion
+ */
+ dwc2_hcd_qh_add(hsotg, qh);
+ }
+ }
+
+ tr_type = dwc2_hcd_select_transactions(hsotg);
+ if (tr_type != DWC2_TRANSACTION_NONE || continue_isoc_xfer) {
+ if (continue_isoc_xfer) {
+ if (tr_type == DWC2_TRANSACTION_NONE)
+ tr_type = DWC2_TRANSACTION_PERIODIC;
+ else if (tr_type == DWC2_TRANSACTION_NON_PERIODIC)
+ tr_type = DWC2_TRANSACTION_ALL;
+ }
+ dwc2_hcd_queue_transactions(hsotg, tr_type);
+ }
+}
--
1.8.2.rc0.16.g20a599e
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
