path: root/drivers/media/video/ivtv/ivtv-irq.c

/* 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"

#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_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->v4l2dev == 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 work_struct *work)
{
	struct ivtv *itv = container_of(work, struct ivtv, irq_work_queue);

	DEFINE_WAIT(wait);

	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);
}

/* 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->v4l2dev == 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(