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path: root/drivers/media/pci/ivtv/ivtv-irq.c
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Diffstat (limited to 'drivers/media/pci/ivtv/ivtv-irq.c')
-rw-r--r--drivers/media/pci/ivtv/ivtv-irq.c1088
1 files changed, 1088 insertions, 0 deletions
diff --git a/drivers/media/pci/ivtv/ivtv-irq.c b/drivers/media/pci/ivtv/ivtv-irq.c
new file mode 100644
index 00000000000..19a7c9b990a
--- /dev/null
+++ b/drivers/media/pci/ivtv/ivtv-irq.c
@@ -0,0 +1,1088 @@
+/* interrupt handling
+ Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
+ Copyright (C) 2004 Chris Kennedy <c@groovy.org>
+ Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ 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 for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "ivtv-driver.h"
+#include "ivtv-queue.h"
+#include "ivtv-udma.h"
+#include "ivtv-irq.h"
+#include "ivtv-mailbox.h"
+#include "ivtv-vbi.h"
+#include "ivtv-yuv.h"
+#include <media/v4l2-event.h>
+
+#define DMA_MAGIC_COOKIE 0x000001fe
+
+static void ivtv_dma_dec_start(struct ivtv_stream *s);
+
+static const int ivtv_stream_map[] = {
+ IVTV_ENC_STREAM_TYPE_MPG,
+ IVTV_ENC_STREAM_TYPE_YUV,
+ IVTV_ENC_STREAM_TYPE_PCM,
+ IVTV_ENC_STREAM_TYPE_VBI,
+};
+
+static void ivtv_pcm_work_handler(struct ivtv *itv)
+{
+ struct ivtv_stream *s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM];
+ struct ivtv_buffer *buf;
+
+ /* Pass the PCM data to ivtv-alsa */
+
+ while (1) {
+ /*
+ * Users should not be using both the ALSA and V4L2 PCM audio
+ * capture interfaces at the same time. If the user is doing
+ * this, there maybe a buffer in q_io to grab, use, and put
+ * back in rotation.
+ */
+ buf = ivtv_dequeue(s, &s->q_io);
+ if (buf == NULL)
+ buf = ivtv_dequeue(s, &s->q_full);
+ if (buf == NULL)
+ break;
+
+ if (buf->readpos < buf->bytesused)
+ itv->pcm_announce_callback(itv->alsa,
+ (u8 *)(buf->buf + buf->readpos),
+ (size_t)(buf->bytesused - buf->readpos));
+
+ ivtv_enqueue(s, buf, &s->q_free);
+ }
+}
+
+static void ivtv_pio_work_handler(struct ivtv *itv)
+{
+ struct ivtv_stream *s = &itv->streams[itv->cur_pio_stream];
+ struct ivtv_buffer *buf;
+ int i = 0;
+
+ IVTV_DEBUG_HI_DMA("ivtv_pio_work_handler\n");
+ if (itv->cur_pio_stream < 0 || itv->cur_pio_stream >= IVTV_MAX_STREAMS ||
+ s->vdev == NULL || !ivtv_use_pio(s)) {
+ itv->cur_pio_stream = -1;
+ /* trigger PIO complete user interrupt */
+ write_reg(IVTV_IRQ_ENC_PIO_COMPLETE, 0x44);
+ return;
+ }
+ IVTV_DEBUG_HI_DMA("Process PIO %s\n", s->name);
+ list_for_each_entry(buf, &s->q_dma.list, list) {
+ u32 size = s->sg_processing[i].size & 0x3ffff;
+
+ /* Copy the data from the card to the buffer */
+ if (s->type == IVTV_DEC_STREAM_TYPE_VBI) {
+ memcpy_fromio(buf->buf, itv->dec_mem + s->sg_processing[i].src - IVTV_DECODER_OFFSET, size);
+ }
+ else {
+ memcpy_fromio(buf->buf, itv->enc_mem + s->sg_processing[i].src, size);
+ }
+ i++;
+ if (i == s->sg_processing_size)
+ break;
+ }
+ write_reg(IVTV_IRQ_ENC_PIO_COMPLETE, 0x44);
+}
+
+void ivtv_irq_work_handler(struct kthread_work *work)
+{
+ struct ivtv *itv = container_of(work, struct ivtv, irq_work);
+
+ if (test_and_clear_bit(IVTV_F_I_WORK_HANDLER_PIO, &itv->i_flags))
+ ivtv_pio_work_handler(itv);
+
+ if (test_and_clear_bit(IVTV_F_I_WORK_HANDLER_VBI, &itv->i_flags))
+ ivtv_vbi_work_handler(itv);
+
+ if (test_and_clear_bit(IVTV_F_I_WORK_HANDLER_YUV, &itv->i_flags))
+ ivtv_yuv_work_handler(itv);
+
+ if (test_and_clear_bit(IVTV_F_I_WORK_HANDLER_PCM, &itv->i_flags))
+ ivtv_pcm_work_handler(itv);
+}
+
+/* Determine the required DMA size, setup enough buffers in the predma queue and
+ actually copy the data from the card to the buffers in case a PIO transfer is
+ required for this stream.
+ */
+static int stream_enc_dma_append(struct ivtv_stream *s, u32 data[CX2341X_MBOX_MAX_DATA])
+{
+ struct ivtv *itv = s->itv;
+ struct ivtv_buffer *buf;
+ u32 bytes_needed = 0;
+ u32 offset, size;
+ u32 UVoffset = 0, UVsize = 0;
+ int skip_bufs = s->q_predma.buffers;
+ int idx = s->sg_pending_size;
+ int rc;
+
+ /* sanity checks */
+ if (s->vdev == NULL) {
+ IVTV_DEBUG_WARN("Stream %s not started\n", s->name);
+ return -1;
+ }
+ if (!test_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
+ IVTV_DEBUG_WARN("Stream %s not open\n", s->name);
+ return -1;
+ }
+
+ /* determine offset, size and PTS for the various streams */
+ switch (s->type) {
+ case IVTV_ENC_STREAM_TYPE_MPG:
+ offset = data[1];
+ size = data[2];
+ s->pending_pts = 0;
+ break;
+
+ case IVTV_ENC_STREAM_TYPE_YUV:
+ offset = data[1];
+ size = data[2];
+ UVoffset = data[3];
+ UVsize = data[4];
+ s->pending_pts = ((u64) data[5] << 32) | data[6];
+ break;
+
+ case IVTV_ENC_STREAM_TYPE_PCM:
+ offset = data[1] + 12;
+ size = data[2] - 12;
+ s->pending_pts = read_dec(offset - 8) |
+ ((u64)(read_dec(offset - 12)) << 32);
+ if (itv->has_cx23415)
+ offset += IVTV_DECODER_OFFSET;
+ break;
+
+ case IVTV_ENC_STREAM_TYPE_VBI:
+ size = itv->vbi.enc_size * itv->vbi.fpi;
+ offset = read_enc(itv->vbi.enc_start - 4) + 12;
+ if (offset == 12) {
+ IVTV_DEBUG_INFO("VBI offset == 0\n");
+ return -1;
+ }
+ s->pending_pts = read_enc(offset - 4) | ((u64)read_enc(offset - 8) << 32);
+ break;
+
+ case IVTV_DEC_STREAM_TYPE_VBI:
+ size = read_dec(itv->vbi.dec_start + 4) + 8;
+ offset = read_dec(itv->vbi.dec_start) + itv->vbi.dec_start;
+ s->pending_pts = 0;
+ offset += IVTV_DECODER_OFFSET;
+ break;
+ default:
+ /* shouldn't happen */
+ return -1;
+ }
+
+ /* if this is the start of the DMA then fill in the magic cookie */
+ if (s->sg_pending_size == 0 && ivtv_use_dma(s)) {
+ if (itv->has_cx23415 && (s->type == IVTV_ENC_STREAM_TYPE_PCM ||
+ s->type == IVTV_DEC_STREAM_TYPE_VBI)) {
+ s->pending_backup = read_dec(offset - IVTV_DECODER_OFFSET);
+ write_dec_sync(cpu_to_le32(DMA_MAGIC_COOKIE), offset - IVTV_DECODER_OFFSET);
+ }
+ else {
+ s->pending_backup = read_enc(offset);
+ write_enc_sync(cpu_to_le32(DMA_MAGIC_COOKIE), offset);
+ }
+ s->pending_offset = offset;
+ }
+
+ bytes_needed = size;
+ if (s->type == IVTV_ENC_STREAM_TYPE_YUV) {
+ /* The size for the Y samples needs to be rounded upwards to a
+ multiple of the buf_size. The UV samples then start in the
+ next buffer. */
+ bytes_needed = s->buf_size * ((bytes_needed + s->buf_size - 1) / s->buf_size);
+ bytes_needed += UVsize;
+ }
+
+ IVTV_DEBUG_HI_DMA("%s %s: 0x%08x bytes at 0x%08x\n",
+ ivtv_use_pio(s) ? "PIO" : "DMA", s->name, bytes_needed, offset);
+
+ rc = ivtv_queue_move(s, &s->q_free, &s->q_full, &s->q_predma, bytes_needed);
+ if (rc < 0) { /* Insufficient buffers */
+ IVTV_DEBUG_WARN("Cannot obtain %d bytes for %s data transfer\n",
+ bytes_needed, s->name);
+ return -1;
+ }
+ if (rc && !s->buffers_stolen && test_bit(IVTV_F_S_APPL_IO, &s->s_flags)) {
+ IVTV_WARN("All %s stream buffers are full. Dropping data.\n", s->name);
+ IVTV_WARN("Cause: the application is not reading fast enough.\n");
+ }
+ s->buffers_stolen = rc;
+
+ /* got the buffers, now fill in sg_pending */
+ buf = list_entry(s->q_predma.list.next, struct ivtv_buffer, list);
+ memset(buf->buf, 0, 128);
+ list_for_each_entry(buf, &s->q_predma.list, list) {
+ if (skip_bufs-- > 0)
+ continue;
+ s->sg_pending[idx].dst = buf->dma_handle;
+ s->sg_pending[idx].src = offset;
+ s->sg_pending[idx].size = s->buf_size;
+ buf->bytesused = min(size, s->buf_size);
+ buf->dma_xfer_cnt = s->dma_xfer_cnt;
+
+ s->q_predma.bytesused += buf->bytesused;
+ size -= buf->bytesused;
+ offset += s->buf_size;
+
+ /* Sync SG buffers */
+ ivtv_buf_sync_for_device(s, buf);
+
+ if (size == 0) { /* YUV */
+ /* process the UV section */
+ offset = UVoffset;
+ size = UVsize;
+ }
+ idx++;
+ }
+ s->sg_pending_size = idx;
+ return 0;
+}
+
+static void dma_post(struct ivtv_stream *s)
+{
+ struct ivtv *itv = s->itv;
+ struct ivtv_buffer *buf = NULL;
+ struct list_head *p;
+ u32 offset;
+ __le32 *u32buf;
+ int x = 0;
+
+ IVTV_DEBUG_HI_DMA("%s %s completed (%x)\n", ivtv_use_pio(s) ? "PIO" : "DMA",
+ s->name, s->dma_offset);
+ list_for_each(p, &s->q_dma.list) {
+ buf = list_entry(p, struct ivtv_buffer, list);
+ u32buf = (__le32 *)buf->buf;
+
+ /* Sync Buffer */
+ ivtv_buf_sync_for_cpu(s, buf);
+
+ if (x == 0 && ivtv_use_dma(s)) {
+ offset = s->dma_last_offset;
+ if (u32buf[offset / 4] != DMA_MAGIC_COOKIE)
+ {
+ for (offset = 0; offset < 64; offset++) {
+ if (u32buf[offset] == DMA_MAGIC_COOKIE) {
+ break;
+ }
+ }
+ offset *= 4;
+ if (offset == 256) {
+ IVTV_DEBUG_WARN("%s: Couldn't find start of buffer within the first 256 bytes\n", s->name);
+ offset = s->dma_last_offset;
+ }
+ if (s->dma_last_offset != offset)
+ IVTV_DEBUG_WARN("%s: offset %d -> %d\n", s->name, s->dma_last_offset, offset);
+ s->dma_last_offset = offset;
+ }
+ if (itv->has_cx23415 && (s->type == IVTV_ENC_STREAM_TYPE_PCM ||
+ s->type == IVTV_DEC_STREAM_TYPE_VBI)) {
+ write_dec_sync(0, s->dma_offset - IVTV_DECODER_OFFSET);
+ }
+ else {
+ write_enc_sync(0, s->dma_offset);
+ }
+ if (offset) {
+ buf->bytesused -= offset;
+ memcpy(buf->buf, buf->buf + offset, buf->bytesused + offset);
+ }
+ *u32buf = cpu_to_le32(s->dma_backup);
+ }
+ x++;
+ /* flag byteswap ABCD -> DCBA for MPG & VBI data outside irq */
+ if (s->type == IVTV_ENC_STREAM_TYPE_MPG ||
+ s->type == IVTV_ENC_STREAM_TYPE_VBI)
+ buf->b_flags |= IVTV_F_B_NEED_BUF_SWAP;
+ }
+ if (buf)
+ buf->bytesused += s->dma_last_offset;
+ if (buf && s->type == IVTV_DEC_STREAM_TYPE_VBI) {
+ list_for_each_entry(buf, &s->q_dma.list, list) {
+ /* Parse and Groom VBI Data */
+ s->q_dma.bytesused -= buf->bytesused;
+ ivtv_process_vbi_data(itv, buf, 0, s->type);
+ s->q_dma.bytesused += buf->bytesused;
+ }
+ if (s->fh == NULL) {
+ ivtv_queue_move(s, &s->q_dma, NULL, &s->q_free, 0);
+ return;
+ }
+ }
+
+ ivtv_queue_move(s, &s->q_dma, NULL, &s->q_full, s->q_dma.bytesused);
+
+ if (s->type == IVTV_ENC_STREAM_TYPE_PCM &&
+ itv->pcm_announce_callback != NULL) {
+ /*
+ * Set up the work handler to pass the data to ivtv-alsa.
+ *
+ * We just use q_full and let the work handler race with users
+ * making ivtv-fileops.c calls on the PCM device node.
+ *
+ * Users should not be using both the ALSA and V4L2 PCM audio
+ * capture interfaces at the same time. If the user does this,
+ * fragments of data will just go out each interface as they
+ * race for PCM data.
+ */
+ set_bit(IVTV_F_I_WORK_HANDLER_PCM, &itv->i_flags);
+ set_bit(IVTV_F_I_HAVE_WORK, &itv->i_flags);
+ }
+
+ if (s->fh)
+ wake_up(&s->waitq);
+}
+
+void ivtv_dma_stream_dec_prepare(struct ivtv_stream *s, u32 offset, int lock)
+{
+ struct ivtv *itv = s->itv;
+ struct yuv_playback_info *yi = &itv->yuv_info;
+ u8 frame = yi->draw_frame;
+ struct yuv_frame_info *f = &yi->new_frame_info[frame];
+ struct ivtv_buffer *buf;
+ u32 y_size = 720 * ((f->src_h + 31) & ~31);
+ u32 uv_offset = offset + IVTV_YUV_BUFFER_UV_OFFSET;
+ int y_done = 0;
+ int bytes_written = 0;
+ unsigned long flags = 0;
+ int idx = 0;
+
+ IVTV_DEBUG_HI_DMA("DEC PREPARE DMA %s: %08x %08x\n", s->name, s->q_predma.bytesused, offset);
+
+ /* Insert buffer block for YUV if needed */
+ if (s->type == IVTV_DEC_STREAM_TYPE_YUV && f->offset_y) {
+ if (yi->blanking_dmaptr) {
+ s->sg_pending[idx].src = yi->blanking_dmaptr;
+ s->sg_pending[idx].dst = offset;
+ s->sg_pending[idx].size = 720 * 16;
+ }
+ offset += 720 * 16;
+ idx++;
+ }
+
+ list_for_each_entry(buf, &s->q_predma.list, list) {
+ /* YUV UV Offset from Y Buffer */
+ if (s->type == IVTV_DEC_STREAM_TYPE_YUV && !y_done &&
+ (bytes_written + buf->bytesused) >= y_size) {
+ s->sg_pending[idx].src = buf->dma_handle;
+ s->sg_pending[idx].dst = offset;
+ s->sg_pending[idx].size = y_size - bytes_written;
+ offset = uv_offset;
+ if (s->sg_pending[idx].size != buf->bytesused) {
+ idx++;
+ s->sg_pending[idx].src =
+ buf->dma_handle + s->sg_pending[idx - 1].size;
+ s->sg_pending[idx].dst = offset;
+ s->sg_pending[idx].size =
+ buf->bytesused - s->sg_pending[idx - 1].size;
+ offset += s->sg_pending[idx].size;
+ }
+ y_done = 1;
+ } else {
+ s->sg_pending[idx].src = buf->dma_handle;
+ s->sg_pending[idx].dst = offset;
+ s->sg_pending[idx].size = buf->bytesused;
+ offset += buf->bytesused;
+ }
+ bytes_written += buf->bytesused;
+
+ /* Sync SG buffers */
+ ivtv_buf_sync_for_device(s, buf);
+ idx++;
+ }
+ s->sg_pending_size = idx;
+
+ /* Sync Hardware SG List of buffers */
+ ivtv_stream_sync_for_device(s);
+ if (lock)
+ spin_lock_irqsave(&itv->dma_reg_lock, flags);
+ if (!test_bit(IVTV_F_I_DMA, &itv->i_flags)) {
+ ivtv_dma_dec_start(s);
+ }
+ else {
+ set_bit(IVTV_F_S_DMA_PENDING, &s->s_flags);
+ }
+ if (lock)
+ spin_unlock_irqrestore(&itv->dma_reg_lock, flags);
+}
+
+static void ivtv_dma_enc_start_xfer(struct ivtv_stream *s)
+{
+ struct ivtv *itv = s->itv;
+
+ s->sg_dma->src = cpu_to_le32(s->sg_processing[s->sg_processed].src);
+ s->sg_dma->dst = cpu_to_le32(s->sg_processing[s->sg_processed].dst);
+ s->sg_dma->size = cpu_to_le32(s->sg_processing[s->sg_processed].size | 0x80000000);
+ s->sg_processed++;
+ /* Sync Hardware SG List of buffers */
+ ivtv_stream_sync_for_device(s);
+ write_reg(s->sg_handle, IVTV_REG_ENCDMAADDR);
+ write_reg_sync(read_reg(IVTV_REG_DMAXFER) | 0x02, IVTV_REG_DMAXFER);
+ itv->dma_timer.expires = jiffies + msecs_to_jiffies(300);
+ add_timer(&itv->dma_timer);
+}
+
+static void ivtv_dma_dec_start_xfer(struct ivtv_stream *s)
+{
+ struct ivtv *itv = s->itv;
+
+ s->sg_dma->src = cpu_to_le32(s->sg_processing[s->sg_processed].src);
+ s->sg_dma->dst = cpu_to_le32(s->sg_processing[s->sg_processed].dst);
+ s->sg_dma->size = cpu_to_le32(s->sg_processing[s->sg_processed].size | 0x80000000);
+ s->sg_processed++;
+ /* Sync Hardware SG List of buffers */
+ ivtv_stream_sync_for_device(s);
+ write_reg(s->sg_handle, IVTV_REG_DECDMAADDR);
+ write_reg_sync(read_reg(IVTV_REG_DMAXFER) | 0x01, IVTV_REG_DMAXFER);
+ itv->dma_timer.expires = jiffies + msecs_to_jiffies(300);
+ add_timer(&itv->dma_timer);
+}
+
+/* start the encoder DMA */
+static void ivtv_dma_enc_start(struct ivtv_stream *s)
+{
+ struct ivtv *itv = s->itv;
+ struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
+ int i;
+
+ IVTV_DEBUG_HI_DMA("start %s for %s\n", ivtv_use_dma(s) ? "DMA" : "PIO", s->name);
+
+ if (s->q_predma.bytesused)
+ ivtv_queue_move(s, &s->q_predma, NULL, &s->q_dma, s->q_predma.bytesused);
+
+ if (ivtv_use_dma(s))
+ s->sg_pending[s->sg_pending_size - 1].size += 256;
+
+ /* If this is an MPEG stream, and VBI data is also pending, then append the
+ VBI DMA to the MPEG DMA and transfer both sets of data at once.
+
+ VBI DMA is a second class citizen compared to MPEG and mixing them together
+ will confuse the firmware (the end of a VBI DMA is seen as the end of a
+ MPEG DMA, thus effectively dropping an MPEG frame). So instead we make
+ sure we only use the MPEG DMA to transfer the VBI DMA if both are in
+ use. This way no conflicts occur. */
+ clear_bit(IVTV_F_S_DMA_HAS_VBI, &s->s_flags);
+ if (s->type == IVTV_ENC_STREAM_TYPE_MPG && s_vbi->sg_pending_size &&
+ s->sg_pending_size + s_vbi->sg_pending_size <= s->buffers) {
+ ivtv_queue_move(s_vbi, &s_vbi->q_predma, NULL, &s_vbi->q_dma, s_vbi->q_predma.bytesused);
+ if (ivtv_use_dma(s_vbi))
+ s_vbi->sg_pending[s_vbi->sg_pending_size - 1].size += 256;
+ for (i = 0; i < s_vbi->sg_pending_size; i++) {
+ s->sg_pending[s->sg_pending_size++] = s_vbi->sg_pending[i];
+ }
+ s_vbi->dma_offset = s_vbi->pending_offset;
+ s_vbi->sg_pending_size = 0;
+ s_vbi->dma_xfer_cnt++;
+ set_bit(IVTV_F_S_DMA_HAS_VBI, &s->s_flags);
+ IVTV_DEBUG_HI_DMA("include DMA for %s\n", s_vbi->name);
+ }
+
+ s->dma_xfer_cnt++;
+ memcpy(s->sg_processing, s->sg_pending, sizeof(struct ivtv_sg_host_element) * s->sg_pending_size);
+ s->sg_processing_size = s->sg_pending_size;
+ s->sg_pending_size = 0;
+ s->sg_processed = 0;
+ s->dma_offset = s->pending_offset;
+ s->dma_backup = s->pending_backup;
+ s->dma_pts = s->pending_pts;
+
+ if (ivtv_use_pio(s)) {
+ set_bit(IVTV_F_I_WORK_HANDLER_PIO, &itv->i_flags);
+ set_bit(IVTV_F_I_HAVE_WORK, &itv->i_flags);
+ set_bit(IVTV_F_I_PIO, &itv->i_flags);
+ itv->cur_pio_stream = s->type;
+ }
+ else {
+ itv->dma_retries = 0;
+ ivtv_dma_enc_start_xfer(s);
+ set_bit(IVTV_F_I_DMA, &itv->i_flags);
+ itv->cur_dma_stream = s->type;
+ }
+}
+
+static void ivtv_dma_dec_start(struct ivtv_stream *s)
+{
+ struct ivtv *itv = s->itv;
+
+ if (s->q_predma.bytesused)
+ ivtv_queue_move(s, &s->q_predma, NULL, &s->q_dma, s->q_predma.bytesused);
+ s->dma_xfer_cnt++;
+ memcpy(s->sg_processing, s->sg_pending, sizeof(struct ivtv_sg_host_element) * s->sg_pending_size);
+ s->sg_processing_size = s->sg_pending_size;
+ s->sg_pending_size = 0;
+ s->sg_processed = 0;
+
+ IVTV_DEBUG_HI_DMA("start DMA for %s\n", s->name);
+ itv->dma_retries = 0;
+ ivtv_dma_dec_start_xfer(s);
+ set_bit(IVTV_F_I_DMA, &itv->i_flags);
+ itv->cur_dma_stream = s->type;
+}
+
+static void ivtv_irq_dma_read(struct ivtv *itv)
+{
+ struct ivtv_stream *s = NULL;
+ struct ivtv_buffer *buf;
+ int hw_stream_type = 0;
+
+ IVTV_DEBUG_HI_IRQ("DEC DMA READ\n");
+
+ del_timer(&itv->dma_timer);
+
+ if (!test_bit(IVTV_F_I_UDMA, &itv->i_flags) && itv->cur_dma_stream < 0)
+ return;
+
+ if (!test_bit(IVTV_F_I_UDMA, &itv->i_flags)) {
+ s = &itv->streams[itv->cur_dma_stream];
+ ivtv_stream_sync_for_cpu(s);
+
+ if (read_reg(IVTV_REG_DMASTATUS) & 0x14) {
+ IVTV_DEBUG_WARN("DEC DMA ERROR %x (xfer %d of %d, retry %d)\n",
+ read_reg(IVTV_REG_DMASTATUS),
+ s->sg_processed, s->sg_processing_size, itv->dma_retries);
+ write_reg(read_reg(IVTV_REG_DMASTATUS) & 3, IVTV_REG_DMASTATUS);
+ if (itv->dma_retries == 3) {
+ /* Too many retries, give up on this frame */
+ itv->dma_retries = 0;
+ s->sg_processed = s->sg_processing_size;
+ }
+ else {
+ /* Retry, starting with the first xfer segment.
+ Just retrying the current segment is not sufficient. */
+ s->sg_processed = 0;
+ itv->dma_retries++;
+ }
+ }
+ if (s->sg_processed < s->sg_processing_size) {
+ /* DMA next buffer */
+ ivtv_dma_dec_start_xfer(s);
+ return;
+ }
+ if (s->type == IVTV_DEC_STREAM_TYPE_YUV)
+ hw_stream_type = 2;
+ IVTV_DEBUG_HI_DMA("DEC DATA READ %s: %d\n", s->name, s->q_dma.bytesused);
+
+ /* For some reason must kick the firmware, like PIO mode,
+ I think this tells the firmware we are done and the size
+ of the xfer so it can calculate what we need next.
+ I think we can do this part ourselves but would have to
+ fully calculate xfer info ourselves and not use interrupts
+ */
+ ivtv_vapi(itv, CX2341X_DEC_SCHED_DMA_FROM_HOST, 3, 0, s->q_dma.bytesused,
+ hw_stream_type);
+
+ /* Free last DMA call */
+ while ((buf = ivtv_dequeue(s, &s->q_dma)) != NULL) {
+ ivtv_buf_sync_for_cpu(s, buf);
+ ivtv_enqueue(s, buf, &s->q_free);
+ }
+ wake_up(&s->waitq);
+ }
+ clear_bit(IVTV_F_I_UDMA, &itv->i_flags);
+ clear_bit(IVTV_F_I_DMA, &itv->i_flags);
+ itv->cur_dma_stream = -1;
+ wake_up(&itv->dma_waitq);
+}
+
+static void ivtv_irq_enc_dma_complete(struct ivtv *itv)
+{
+ u32 data[CX2341X_MBOX_MAX_DATA];
+ struct ivtv_stream *s;
+
+ ivtv_api_get_data(&itv->enc_mbox, IVTV_MBOX_DMA_END, 2, data);
+ IVTV_DEBUG_HI_IRQ("ENC DMA COMPLETE %x %d (%d)\n", data[0], data[1], itv->cur_dma_stream);
+
+ del_timer(&itv->dma_timer);
+
+ if (itv->cur_dma_stream < 0)
+ return;
+
+ s = &itv->streams[itv->cur_dma_stream];
+ ivtv_stream_sync_for_cpu(s);
+
+ if (data[0] & 0x18) {
+ IVTV_DEBUG_WARN("ENC DMA ERROR %x (offset %08x, xfer %d of %d, retry %d)\n", data[0],
+ s->dma_offset, s->sg_processed, s->sg_processing_size, itv->dma_retries);
+ write_reg(read_reg(IVTV_REG_DMASTATUS) & 3, IVTV_REG_DMASTATUS);
+ if (itv->dma_retries == 3) {
+ /* Too many retries, give up on this frame */
+ itv->dma_retries = 0;
+ s->sg_processed = s->sg_processing_size;
+ }
+ else {
+ /* Retry, starting with the first xfer segment.
+ Just retrying the current segment is not sufficient. */
+ s->sg_processed = 0;
+ itv->dma_retries++;
+ }
+ }
+ if (s->sg_processed < s->sg_processing_size) {
+ /* DMA next buffer */
+ ivtv_dma_enc_start_xfer(s);
+ return;
+ }
+ clear_bit(IVTV_F_I_DMA, &itv->i_flags);
+ itv->cur_dma_stream = -1;
+ dma_post(s);
+ if (test_and_clear_bit(IVTV_F_S_DMA_HAS_VBI, &s->s_flags)) {
+ s = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
+ dma_post(s);
+ }
+ s->sg_processing_size = 0;
+ s->sg_processed = 0;
+ wake_up(&itv->dma_waitq);
+}
+
+static void ivtv_irq_enc_pio_complete(struct ivtv *itv)
+{
+ struct ivtv_stream *s;
+
+ if (itv->cur_pio_stream < 0 || itv->cur_pio_stream >= IVTV_MAX_STREAMS) {
+ itv->cur_pio_stream = -1;
+ return;
+ }
+ s = &itv->streams[itv->cur_pio_stream];
+ IVTV_DEBUG_HI_IRQ("ENC PIO COMPLETE %s\n", s->name);
+ clear_bit(IVTV_F_I_PIO, &itv->i_flags);
+ itv->cur_pio_stream = -1;
+ dma_post(s);
+ if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
+ ivtv_vapi(itv, CX2341X_ENC_SCHED_DMA_TO_HOST, 3, 0, 0, 0);
+ else if (s->type == IVTV_ENC_STREAM_TYPE_YUV)
+ ivtv_vapi(itv, CX2341X_ENC_SCHED_DMA_TO_HOST, 3, 0, 0, 1);
+ else if (s->type == IVTV_ENC_STREAM_TYPE_PCM)
+ ivtv_vapi(itv, CX2341X_ENC_SCHED_DMA_TO_HOST, 3, 0, 0, 2);
+ clear_bit(IVTV_F_I_PIO, &itv->i_flags);
+ if (test_and_clear_bit(IVTV_F_S_DMA_HAS_VBI, &s->s_flags)) {
+ s = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
+ dma_post(s);
+ }
+ wake_up(&itv->dma_waitq);
+}
+
+static void ivtv_irq_dma_err(struct ivtv *itv)
+{
+ u32 data[CX2341X_MBOX_MAX_DATA];
+ u32 status;
+
+ del_timer(&itv->dma_timer);
+
+ ivtv_api_get_data(&itv->enc_mbox, IVTV_MBOX_DMA_END, 2, data);
+ status = read_reg(IVTV_REG_DMASTATUS);
+ IVTV_DEBUG_WARN("DMA ERROR %08x %08x %08x %d\n", data[0], data[1],
+ status, itv->cur_dma_stream);
+ /*
+ * We do *not* write back to the IVTV_REG_DMASTATUS register to
+ * clear the error status, if either the encoder write (0x02) or
+ * decoder read (0x01) bus master DMA operation do not indicate
+ * completed. We can race with the DMA engine, which may have
+ * transitioned to completed status *after* we read the register.
+ * Setting a IVTV_REG_DMASTATUS flag back to "busy" status, after the
+ * DMA engine has completed, will cause the DMA engine to stop working.
+ */
+ status &= 0x3;
+ if (status == 0x3)
+ write_reg(status, IVTV_REG_DMASTATUS);
+
+ if (!test_bit(IVTV_F_I_UDMA, &itv->i_flags) &&
+ itv->cur_dma_stream >= 0 && itv->cur_dma_stream < IVTV_MAX_STREAMS) {
+ struct ivtv_stream *s = &itv->streams[itv->cur_dma_stream];
+
+ if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) {
+ /* retry */
+ /*
+ * FIXME - handle cases of DMA error similar to
+ * encoder below, except conditioned on status & 0x1
+ */
+ ivtv_dma_dec_start(s);
+ return;
+ } else {
+ if ((status & 0x2) == 0) {
+ /*
+ * CX2341x Bus Master DMA write is ongoing.
+ * Reset the timer and let it complete.
+ */
+ itv->dma_timer.expires =
+ jiffies + msecs_to_jiffies(600);
+ add_timer(&itv->dma_timer);
+ return;
+ }
+
+ if (itv->dma_retries < 3) {
+ /*
+ * CX2341x Bus Master DMA write has ended.
+ * Retry the write, starting with the first
+ * xfer segment. Just retrying the current
+ * segment is not sufficient.
+ */
+ s->sg_processed = 0;
+ itv->dma_retries++;
+ ivtv_dma_enc_start_xfer(s);
+ return;
+ }
+ /* Too many retries, give up on this one */
+ }
+
+ }
+ if (test_bit(IVTV_F_I_UDMA, &itv->i_flags)) {
+ ivtv_udma_start(itv);
+ return;
+ }
+ clear_bit(IVTV_F_I_UDMA, &itv->i_flags);
+ clear_bit(IVTV_F_I_DMA, &itv->i_flags);
+ itv->cur_dma_stream = -1;
+ wake_up(&itv->dma_waitq);
+}
+
+static void ivtv_irq_enc_start_cap(struct ivtv *itv)
+{
+ u32 data[CX2341X_MBOX_MAX_DATA];
+ struct ivtv_stream *s;
+
+ /* Get DMA destination and size arguments from card */
+ ivtv_api_get_data(&itv->enc_mbox, IVTV_MBOX_DMA, 7, data);
+ IVTV_DEBUG_HI_IRQ("ENC START CAP %d: %08x %08x\n", data[0], data[1], data[2]);
+
+ if (data[0] > 2 || data[1] == 0 || data[2] == 0) {
+ IVTV_DEBUG_WARN("Unknown input: %08x %08x %08x\n",
+ data[0], data[1], data[2]);
+ return;
+ }
+ s = &itv->streams[ivtv_stream_map[data[0]]];
+ if (!stream_enc_dma_append(s, data)) {
+ set_bit(ivtv_use_pio(s) ? IVTV_F_S_PIO_PENDING : IVTV_F_S_DMA_PENDING, &s->s_flags);
+ }
+}
+
+static void ivtv_irq_enc_vbi_cap(struct ivtv *itv)
+{
+ u32 data[CX2341X_MBOX_MAX_DATA];
+ struct ivtv_stream *s;
+
+ IVTV_DEBUG_HI_IRQ("ENC START VBI CAP\n");
+ s = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
+
+ if (!stream_enc_dma_append(s, data))
+ set_bit(ivtv_use_pio(s) ? IVTV_F_S_PIO_PENDING : IVTV_F_S_DMA_PENDING, &s->s_flags);
+}
+
+static void ivtv_irq_dec_vbi_reinsert(struct ivtv *itv)
+{
+ u32 data[CX2341X_MBOX_MAX_DATA];
+ struct ivtv_stream *s = &itv->streams[IVTV_DEC_STREAM_TYPE_VBI];
+
+ IVTV_DEBUG_HI_IRQ("DEC VBI REINSERT\n");
+ if (test_bit(IVTV_F_S_CLAIMED, &s->s_flags) &&
+ !stream_enc_dma_append(s, data)) {
+ set_bit(IVTV_F_S_PIO_PENDING, &s->s_flags);
+ }
+}
+
+static void ivtv_irq_dec_data_req(struct ivtv *itv)
+{
+ u32 data[CX2341X_MBOX_MAX_DATA];
+ struct ivtv_stream *s;
+
+ /* YUV or MPG */
+
+ if (test_bit(IVTV_F_I_DEC_YUV, &itv->i_flags)) {
+ ivtv_api_get_data(&itv->dec_mbox, IVTV_MBOX_DMA, 2, data);
+ itv->dma_data_req_size =
+ 1080 * ((itv->yuv_info.v4l2_src_h + 31) & ~31);
+ itv->dma_data_req_offset = data[1];
+ if (atomic_read(&itv->yuv_info.next_dma_frame) >= 0)
+ ivtv_yuv_frame_complete(itv);
+ s = &itv->streams[IVTV_DEC_STREAM_TYPE_YUV];
+ }
+ else {
+ ivtv_api_get_data(&itv->dec_mbox, IVTV_MBOX_DMA, 3, data);
+ itv->dma_data_req_size = min_t(u32, data[2], 0x10000);
+ itv->dma_data_req_offset = data[1];
+ s = &itv->streams[IVTV_DEC_STREAM_TYPE_MPG];
+ }
+ IVTV_DEBUG_HI_IRQ("DEC DATA REQ %s: %d %08x %u\n", s->name, s->q_full.bytesused,
+ itv->dma_data_req_offset, itv->dma_data_req_size);
+ if (itv->dma_data_req_size == 0 || s->q_full.bytesused < itv->dma_data_req_size) {
+ set_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
+ }
+ else {
+ if (test_bit(IVTV_F_I_DEC_YUV, &itv->i_flags))
+ ivtv_yuv_setup_stream_frame(itv);
+ clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
+ ivtv_queue_move(s, &s->q_full, NULL, &s->q_predma, itv->dma_data_req_size);
+ ivtv_dma_stream_dec_prepare(s, itv->dma_data_req_offset + IVTV_DECODER_OFFSET, 0);
+ }
+}
+
+static void ivtv_irq_vsync(struct ivtv *itv)
+{
+ /* The vsync interrupt is unusual in that it won't clear until
+ * the end of the first line for the current field, at which
+ * point it clears itself. This can result in repeated vsync
+ * interrupts, or a missed vsync. Read some of the registers
+ * to determine the line being displayed and ensure we handle
+ * one vsync per frame.
+ */
+ unsigned int frame = read_reg(IVTV_REG_DEC_LINE_FIELD) & 1;
+ struct yuv_playback_info *yi = &itv->yuv_info;
+ int last_dma_frame = atomic_read(&yi->next_dma_frame);
+ struct yuv_frame_info *f = &yi->new_frame_info[last_dma_frame];
+
+ if (0) IVTV_DEBUG_IRQ("DEC VSYNC\n");
+
+ if (((frame ^ f->sync_field) == 0 &&
+ ((itv->last_vsync_field & 1) ^ f->sync_field)) ||
+ (frame != (itv->last_vsync_field & 1) && !f->interlaced)) {
+ int next_dma_frame = last_dma_frame;
+
+ if (!(f->interlaced && f->delay && yi->fields_lapsed < 1)) {
+ if (next_dma_frame >= 0 && next_dma_frame != atomic_read(&yi->next_fill_frame)) {
+ write_reg(yuv_offset[next_dma_frame] >> 4, 0x82c);
+ write_reg((yuv_offset[next_dma_frame] + IVTV_YUV_BUFFER_UV_OFFSET) >> 4, 0x830);
+ write_reg(yuv_offset[next_dma_frame] >> 4, 0x834);
+ write_reg((yuv_offset[next_dma_frame] + IVTV_YUV_BUFFER_UV_OFFSET) >> 4, 0x838);
+ next_dma_frame = (next_dma_frame + 1) % IVTV_YUV_BUFFERS;
+ atomic_set(&yi->next_dma_frame, next_dma_frame);
+ yi->fields_lapsed = -1;
+ yi->running = 1;
+ }
+ }
+ }
+ if (frame != (itv->last_vsync_field & 1)) {
+ static const struct v4l2_event evtop = {
+ .type = V4L2_EVENT_VSYNC,
+ .u.vsync.field = V4L2_FIELD_TOP,
+ };
+ static const struct v4l2_event evbottom = {
+ .type = V4L2_EVENT_VSYNC,
+ .u.vsync.field = V4L2_FIELD_BOTTOM,
+ };
+ struct ivtv_stream *s = ivtv_get_output_stream(itv);
+
+ itv->last_vsync_field += 1;
+ if (frame == 0) {
+ clear_bit(IVTV_F_I_VALID_DEC_TIMINGS, &itv->i_flags);
+ clear_bit(IVTV_F_I_EV_VSYNC_FIELD, &itv->i_flags);
+ }
+ else {
+ set_bit(IVTV_F_I_EV_VSYNC_FIELD, &itv->i_flags);
+ }
+ if (test_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags)) {
+ set_bit(IVTV_F_I_EV_VSYNC, &itv->i_flags);
+ wake_up(&itv->event_waitq);
+ if (s)
+ wake_up(&s->waitq);
+ }
+ if (s && s->vdev)
+ v4l2_event_queue(s->vdev, frame ? &evtop : &evbottom);
+ wake_up(&itv->vsync_waitq);
+
+ /* Send VBI to saa7127 */
+ if (frame && (itv->output_mode == OUT_PASSTHROUGH ||
+ test_bit(IVTV_F_I_UPDATE_WSS, &itv->i_flags) ||
+ test_bit(IVTV_F_I_UPDATE_VPS, &itv->i_flags) ||
+ test_bit(IVTV_F_I_UPDATE_CC, &itv->i_flags))) {
+ set_bit(IVTV_F_I_WORK_HANDLER_VBI, &itv->i_flags);
+ set_bit(IVTV_F_I_HAVE_WORK, &itv->i_flags);
+ }
+
+ /* Check if we need to update the yuv registers */
+ if (yi->running && (yi->yuv_forced_update || f->update)) {
+ if (!f->update) {
+ last_dma_frame =
+ (u8)(atomic_read(&yi->next_dma_frame) -
+ 1) % IVTV_YUV_BUFFERS;
+ f = &yi->new_frame_info[last_dma_frame];
+ }
+
+ if (f->src_w) {
+ yi->update_frame = last_dma_frame;
+ f->update = 0;
+ yi->yuv_forced_update = 0;
+ set_bit(IVTV_F_I_WORK_HANDLER_YUV, &itv->i_flags);
+ set_bit(IVTV_F_I_HAVE_WORK, &itv->i_flags);
+ }
+ }
+
+ yi->fields_lapsed++;
+ }
+}
+
+#define IVTV_IRQ_DMA (IVTV_IRQ_DMA_READ | IVTV_IRQ_ENC_DMA_COMPLETE | IVTV_IRQ_DMA_ERR | IVTV_IRQ_ENC_START_CAP | IVTV_IRQ_ENC_VBI_CAP | IVTV_IRQ_DEC_DATA_REQ | IVTV_IRQ_DEC_VBI_RE_INSERT)
+
+irqreturn_t ivtv_irq_handler(int irq, void *dev_id)
+{
+ struct ivtv *itv = (struct ivtv *)dev_id;
+ u32 combo;
+ u32 stat;
+ int i;
+ u8 vsync_force = 0;
+
+ spin_lock(&itv->dma_reg_lock);
+ /* get contents of irq status register */
+ stat = read_reg(IVTV_REG_IRQSTATUS);
+
+ combo = ~itv->irqmask & stat;
+
+ /* Clear out IRQ */
+ if (combo) write_reg(combo, IVTV_REG_IRQSTATUS);
+
+ if (0 == combo) {
+ /* The vsync interrupt is unusual and clears itself. If we
+ * took too long, we may have missed it. Do some checks
+ */
+ if (~itv->irqmask & IVTV_IRQ_DEC_VSYNC) {
+ /* vsync is enabled, see if we're in a new field */
+ if ((itv->last_vsync_field & 1) !=
+ (read_reg(IVTV_REG_DEC_LINE_FIELD) & 1)) {
+ /* New field, looks like we missed it */
+ IVTV_DEBUG_YUV("VSync interrupt missed %d\n",
+ read_reg(IVTV_REG_DEC_LINE_FIELD) >> 16);
+ vsync_force = 1;
+ }
+ }
+
+ if (!vsync_force) {
+ /* No Vsync expected, wasn't for us */
+ spin_unlock(&itv->dma_reg_lock);
+ return IRQ_NONE;
+ }
+ }
+
+ /* Exclude interrupts noted below from the output, otherwise the log is flooded with
+ these messages */
+ if (combo & ~0xff6d0400)
+ IVTV_DEBUG_HI_IRQ("======= valid IRQ bits: 0x%08x ======\n", combo);
+
+ if (combo & IVTV_IRQ_DEC_DMA_COMPLETE) {
+ IVTV_DEBUG_HI_IRQ("DEC DMA COMPLETE\n");
+ }
+
+ if (combo & IVTV_IRQ_DMA_READ) {
+ ivtv_irq_dma_read(itv);
+ }
+
+ if (combo & IVTV_IRQ_ENC_DMA_COMPLETE) {
+ ivtv_irq_enc_dma_complete(itv);
+ }
+
+ if (combo & IVTV_IRQ_ENC_PIO_COMPLETE) {
+ ivtv_irq_enc_pio_complete(itv);
+ }
+
+ if (combo & IVTV_IRQ_DMA_ERR) {
+ ivtv_irq_dma_err(itv);
+ }
+
+ if (combo & IVTV_IRQ_ENC_START_CAP) {
+ ivtv_irq_enc_start_cap(itv);
+ }
+
+ if (combo & IVTV_IRQ_ENC_VBI_CAP) {
+ ivtv_irq_enc_vbi_cap(itv);
+ }
+
+ if (combo & IVTV_IRQ_DEC_VBI_RE_INSERT) {
+ ivtv_irq_dec_vbi_reinsert(itv);
+ }
+
+ if (combo & IVTV_IRQ_ENC_EOS) {
+ IVTV_DEBUG_IRQ("ENC EOS\n");
+ set_bit(IVTV_F_I_EOS, &itv->i_flags);
+ wake_up(&itv->eos_waitq);
+ }
+
+ if (combo & IVTV_IRQ_DEC_DATA_REQ) {
+ ivtv_irq_dec_data_req(itv);
+ }
+
+ /* Decoder Vertical Sync - We can't rely on 'combo', so check if vsync enabled */
+ if (~itv->irqmask & IVTV_IRQ_DEC_VSYNC) {
+ ivtv_irq_vsync(itv);
+ }
+
+ if (combo & IVTV_IRQ_ENC_VIM_RST) {
+ IVTV_DEBUG_IRQ("VIM RST\n");
+ /*ivtv_vapi(itv, CX2341X_ENC_REFRESH_INPUT, 0); */
+ }
+
+ if (combo & IVTV_IRQ_DEC_AUD_MODE_CHG) {
+ IVTV_DEBUG_INFO("Stereo mode changed\n");
+ }
+
+ if ((combo & IVTV_IRQ_DMA) && !test_bit(IVTV_F_I_DMA, &itv->i_flags)) {
+ itv->irq_rr_idx++;
+ for (i = 0; i < IVTV_MAX_STREAMS; i++) {
+ int idx = (i + itv->irq_rr_idx) % IVTV_MAX_STREAMS;
+ struct ivtv_stream *s = &itv->streams[idx];
+
+ if (!test_and_clear_bit(IVTV_F_S_DMA_PENDING, &s->s_flags))
+ continue;
+ if (s->type >= IVTV_DEC_STREAM_TYPE_MPG)
+ ivtv_dma_dec_start(s);
+ else
+ ivtv_dma_enc_start(s);
+ break;
+ }
+
+ if (i == IVTV_MAX_STREAMS &&
+ test_bit(IVTV_F_I_UDMA_PENDING, &itv->i_flags))
+ ivtv_udma_start(itv);
+ }
+
+ if ((combo & IVTV_IRQ_DMA) && !test_bit(IVTV_F_I_PIO, &itv->i_flags)) {
+ itv->irq_rr_idx++;
+ for (i = 0; i < IVTV_MAX_STREAMS; i++) {
+ int idx = (i + itv->irq_rr_idx) % IVTV_MAX_STREAMS;
+ struct ivtv_stream *s = &itv->streams[idx];
+
+ if (!test_and_clear_bit(IVTV_F_S_PIO_PENDING, &s->s_flags))
+ continue;
+ if (s->type == IVTV_DEC_STREAM_TYPE_VBI || s->type < IVTV_DEC_STREAM_TYPE_MPG)
+ ivtv_dma_enc_start(s);
+ break;
+ }
+ }
+
+ if (test_and_clear_bit(IVTV_F_I_HAVE_WORK, &itv->i_flags)) {
+ queue_kthread_work(&itv->irq_worker, &itv->irq_work);
+ }
+
+ spin_unlock(&itv->dma_reg_lock);
+
+ /* If we've just handled a 'forced' vsync, it's safest to say it
+ * wasn't ours. Another device may have triggered it at just
+ * the right time.
+ */
+ return vsync_force ? IRQ_NONE : IRQ_HANDLED;
+}
+
+void ivtv_unfinished_dma(unsigned long arg)
+{
+ struct ivtv *itv = (struct ivtv *)arg;
+
+ if (!test_bit(IVTV_F_I_DMA, &itv->i_flags))
+ return;
+ IVTV_ERR("DMA TIMEOUT %08x %d\n", read_reg(IVTV_REG_DMASTATUS), itv->cur_dma_stream);
+
+ write_reg(read_reg(IVTV_REG_DMASTATUS) & 3, IVTV_REG_DMASTATUS);
+ clear_bit(IVTV_F_I_UDMA, &itv->i_flags);
+ clear_bit(IVTV_F_I_DMA, &itv->i_flags);
+ itv->cur_dma_stream = -1;
+ wake_up(&itv->dma_waitq);
+}