V4L/DVB (9800): cx18: Eliminate q_io from stream buffer handling

[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / media / video / cx18 / cx18-streams.c

/*
 *  cx18 init/start/stop/exit stream functions
 *
 *  Derived from ivtv-streams.c
 *
 *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
 *  Copyright (C) 2008  Andy Walls <awalls@radix.net>
 *
 *  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 "cx18-driver.h"
#include "cx18-io.h"
#include "cx18-fileops.h"
#include "cx18-mailbox.h"
#include "cx18-i2c.h"
#include "cx18-queue.h"
#include "cx18-ioctl.h"
#include "cx18-streams.h"
#include "cx18-cards.h"
#include "cx18-scb.h"
#include "cx18-av-core.h"
#include "cx18-dvb.h"

#define CX18_DSP0_INTERRUPT_MASK        0xd0004C

static struct file_operations cx18_v4l2_enc_fops = {
        .owner = THIS_MODULE,
        .read = cx18_v4l2_read,
        .open = cx18_v4l2_open,
        /* FIXME change to video_ioctl2 if serialization lock can be removed */
        .ioctl = cx18_v4l2_ioctl,
        .compat_ioctl = v4l_compat_ioctl32,
        .release = cx18_v4l2_close,
        .poll = cx18_v4l2_enc_poll,
};

/* offset from 0 to register ts v4l2 minors on */
#define CX18_V4L2_ENC_TS_OFFSET   16
/* offset from 0 to register pcm v4l2 minors on */
#define CX18_V4L2_ENC_PCM_OFFSET  24
/* offset from 0 to register yuv v4l2 minors on */
#define CX18_V4L2_ENC_YUV_OFFSET  32

static struct {
        const char *name;
        int vfl_type;
        int num_offset;
        int dma;
        enum v4l2_buf_type buf_type;
        struct file_operations *fops;
} cx18_stream_info[] = {
        {       /* CX18_ENC_STREAM_TYPE_MPG */
                "encoder MPEG",
                VFL_TYPE_GRABBER, 0,
                PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VIDEO_CAPTURE,
                &cx18_v4l2_enc_fops
        },
        {       /* CX18_ENC_STREAM_TYPE_TS */
                "TS",
                VFL_TYPE_GRABBER, -1,
                PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VIDEO_CAPTURE,
                &cx18_v4l2_enc_fops
        },
        {       /* CX18_ENC_STREAM_TYPE_YUV */
                "encoder YUV",
                VFL_TYPE_GRABBER, CX18_V4L2_ENC_YUV_OFFSET,
                PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VIDEO_CAPTURE,
                &cx18_v4l2_enc_fops
        },
        {       /* CX18_ENC_STREAM_TYPE_VBI */
                "encoder VBI",
                VFL_TYPE_VBI, 0,
                PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VBI_CAPTURE,
                &cx18_v4l2_enc_fops
        },
        {       /* CX18_ENC_STREAM_TYPE_PCM */
                "encoder PCM audio",
                VFL_TYPE_GRABBER, CX18_V4L2_ENC_PCM_OFFSET,
                PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_PRIVATE,
                &cx18_v4l2_enc_fops
        },
        {       /* CX18_ENC_STREAM_TYPE_IDX */
                "encoder IDX",
                VFL_TYPE_GRABBER, -1,
                PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VIDEO_CAPTURE,
                &cx18_v4l2_enc_fops
        },
        {       /* CX18_ENC_STREAM_TYPE_RAD */
                "encoder radio",
                VFL_TYPE_RADIO, 0,
                PCI_DMA_NONE, V4L2_BUF_TYPE_PRIVATE,
                &cx18_v4l2_enc_fops
        },
};

static void cx18_stream_init(struct cx18 *cx, int type)
{
        struct cx18_stream *s = &cx->streams[type];
        struct video_device *dev = s->v4l2dev;
        u32 max_size = cx->options.megabytes[type] * 1024 * 1024;

        /* we need to keep v4l2dev, so restore it afterwards */
        memset(s, 0, sizeof(*s));
        s->v4l2dev = dev;

        /* initialize cx18_stream fields */
        s->cx = cx;
        s->type = type;
        s->name = cx18_stream_info[type].name;
        s->handle = CX18_INVALID_TASK_HANDLE;

        s->dma = cx18_stream_info[type].dma;
        s->buf_size = cx->stream_buf_size[type];
        if (s->buf_size)
                s->buffers = max_size / s->buf_size;
        if (s->buffers > 63) {
                /* Each stream has a maximum of 63 buffers,
                   ensure we do not exceed that. */
                s->buffers = 63;
                s->buf_size = (max_size / s->buffers) & ~0xfff;
        }
        mutex_init(&s->qlock);
        init_waitqueue_head(&s->waitq);
        s->id = -1;
        cx18_queue_init(&s->q_free);
        cx18_queue_init(&s->q_full);
}

static int cx18_prep_dev(struct cx18 *cx, int type)
{
        struct cx18_stream *s = &cx->streams[type];
        u32 cap = cx->v4l2_cap;
        int num_offset = cx18_stream_info[type].num_offset;
        int num = cx->num + cx18_first_minor + num_offset;

        /* These four fields are always initialized. If v4l2dev == NULL, then
           this stream is not in use. In that case no other fields but these
           four can be used. */
        s->v4l2dev = NULL;
        s->cx = cx;
        s->type = type;
        s->name = cx18_stream_info[type].name;

        /* Check whether the radio is supported */
        if (type == CX18_ENC_STREAM_TYPE_RAD && !(cap & V4L2_CAP_RADIO))
                return 0;

        /* Check whether VBI is supported */
        if (type == CX18_ENC_STREAM_TYPE_VBI &&
            !(cap & (V4L2_CAP_VBI_CAPTURE | V4L2_CAP_SLICED_VBI_CAPTURE)))
                return 0;

        /* User explicitly selected 0 buffers for these streams, so don't
           create them. */
        if (cx18_stream_info[type].dma != PCI_DMA_NONE &&
            cx->options.megabytes[type] == 0) {
                CX18_INFO("Disabled %s device\n", cx18_stream_info[type].name);
                return 0;
        }

        cx18_stream_init(cx, type);

        if (num_offset == -1)
                return 0;

        /* allocate and initialize the v4l2 video device structure */
        s->v4l2dev = video_device_alloc();
        if (s->v4l2dev == NULL) {
                CX18_ERR("Couldn't allocate v4l2 video_device for %s\n",
                                s->name);
                return -ENOMEM;
        }

        snprintf(s->v4l2dev->name, sizeof(s->v4l2dev->name), "cx18-%d",
                        cx->num);

        s->v4l2dev->num = num;
        s->v4l2dev->parent = &cx->dev->dev;
        s->v4l2dev->fops = cx18_stream_info[type].fops;
        s->v4l2dev->release = video_device_release;
        s->v4l2dev->tvnorms = V4L2_STD_ALL;
        cx18_set_funcs(s->v4l2dev);
        return 0;
}

/* Initialize v4l2 variables and register v4l2 devices */
int cx18_streams_setup(struct cx18 *cx)
{
        int type, ret;

        /* Setup V4L2 Devices */
        for (type = 0; type < CX18_MAX_STREAMS; type++) {
                /* Prepare device */
                ret = cx18_prep_dev(cx, type);
                if (ret < 0)
                        break;

                /* Allocate Stream */
                ret = cx18_stream_alloc(&cx->streams[type]);
                if (ret < 0)
                        break;
        }
        if (type == CX18_MAX_STREAMS)
                return 0;

        /* One or more streams could not be initialized. Clean 'em all up. */
        cx18_streams_cleanup(cx, 0);
        return ret;
}

static int cx18_reg_dev(struct cx18 *cx, int type)
{
        struct cx18_stream *s = &cx->streams[type];
        int vfl_type = cx18_stream_info[type].vfl_type;
        int num, ret;

        /* TODO: Shouldn't this be a VFL_TYPE_TRANSPORT or something?
         * We need a VFL_TYPE_TS defined.
         */
        if (strcmp("TS", s->name) == 0) {
                /* just return if no DVB is supported */
                if ((cx->card->hw_all & CX18_HW_DVB) == 0)
                        return 0;
                ret = cx18_dvb_register(s);
                if (ret < 0) {
                        CX18_ERR("DVB failed to register\n");
                        return ret;
                }
        }

        if (s->v4l2dev == NULL)
                return 0;

        num = s->v4l2dev->num;
        /* card number + user defined offset + device offset */
        if (type != CX18_ENC_STREAM_TYPE_MPG) {
                struct cx18_stream *s_mpg = &cx->streams[CX18_ENC_STREAM_TYPE_MPG];

                if (s_mpg->v4l2dev)
                        num = s_mpg->v4l2dev->num + cx18_stream_info[type].num_offset;
        }

        /* Register device. First try the desired minor, then any free one. */
        ret = video_register_device(s->v4l2dev, vfl_type, num);
        if (ret < 0) {
                CX18_ERR("Couldn't register v4l2 device for %s kernel number %d\n",
                        s->name, num);
                video_device_release(s->v4l2dev);
                s->v4l2dev = NULL;
                return ret;
        }
        num = s->v4l2dev->num;

        switch (vfl_type) {
        case VFL_TYPE_GRABBER:
                CX18_INFO("Registered device video%d for %s (%d MB)\n",
                        num, s->name, cx->options.megabytes[type]);
                break;

        case VFL_TYPE_RADIO:
                CX18_INFO("Registered device radio%d for %s\n",
                        num, s->name);
                break;

        case VFL_TYPE_VBI:
                if (cx->options.megabytes[type])
                        CX18_INFO("Registered device vbi%d for %s (%d MB)\n",
                                num,
                                s->name, cx->options.megabytes[type]);
                else
                        CX18_INFO("Registered device vbi%d for %s\n",
                                num, s->name);
                break;
        }

        return 0;
}

/* Register v4l2 devices */
int cx18_streams_register(struct cx18 *cx)
{
        int type;
        int err;
        int ret = 0;

        /* Register V4L2 devices */
        for (type = 0; type < CX18_MAX_STREAMS; type++) {
                err = cx18_reg_dev(cx, type);
                if (err && ret == 0)
                        ret = err;
        }

        if (ret == 0)
                return 0;

        /* One or more streams could not be initialized. Clean 'em all up. */
        cx18_streams_cleanup(cx, 1);
        return ret;
}

/* Unregister v4l2 devices */
void cx18_streams_cleanup(struct cx18 *cx, int unregister)
{
        struct video_device *vdev;
        int type;

        /* Teardown all streams */
        for (type = 0; type < CX18_MAX_STREAMS; type++) {
                if (cx->streams[type].dvb.enabled) {
                        cx18_dvb_unregister(&cx->streams[type]);
                        cx->streams[type].dvb.enabled = false;
                }

                vdev = cx->streams[type].v4l2dev;

                cx->streams[type].v4l2dev = NULL;
                if (vdev == NULL)
                        continue;

                cx18_stream_free(&cx->streams[type]);

                /* Unregister or release device */
                if (unregister)
                        video_unregister_device(vdev);
                else
                        video_device_release(vdev);
        }
}

static void cx18_vbi_setup(struct cx18_stream *s)
{
        struct cx18 *cx = s->cx;
        int raw = cx->vbi.sliced_in->service_set == 0;
        u32 data[CX2341X_MBOX_MAX_DATA];
        int lines;

        if (cx->is_60hz) {
                cx->vbi.count = 12;
                cx->vbi.start[0] = 10;
                cx->vbi.start[1] = 273;
        } else {        /* PAL/SECAM */
                cx->vbi.count = 18;
                cx->vbi.start[0] = 6;
                cx->vbi.start[1] = 318;
        }

        /* setup VBI registers */
        cx18_av_cmd(cx, VIDIOC_S_FMT, &cx->vbi.in);

        /* determine number of lines and total number of VBI bytes.
           A raw line takes 1443 bytes: 2 * 720 + 4 byte frame header - 1
           The '- 1' byte is probably an unused U or V byte. Or something...
           A sliced line takes 51 bytes: 4 byte frame header, 4 byte internal
           header, 42 data bytes + checksum (to be confirmed) */
        if (raw) {
                lines = cx->vbi.count * 2;
        } else {
                lines = cx->is_60hz ? 24 : 38;
                if (cx->is_60hz)
                        lines += 2;
        }

        cx->vbi.enc_size = lines *
                (raw ? cx->vbi.raw_size : cx->vbi.sliced_size);

        data[0] = s->handle;
        /* Lines per field */
        data[1] = (lines / 2) | ((lines / 2) << 16);
        /* bytes per line */
        data[2] = (raw ? cx->vbi.raw_size : cx->vbi.sliced_size);
        /* Every X number of frames a VBI interrupt arrives
           (frames as in 25 or 30 fps) */
        data[3] = 1;
        /* Setup VBI for the cx25840 digitizer */
        if (raw) {
                data[4] = 0x20602060;
                data[5] = 0x30703070;
        } else {
                data[4] = 0xB0F0B0F0;
                data[5] = 0xA0E0A0E0;
        }

        CX18_DEBUG_INFO("Setup VBI h: %d lines %x bpl %d fr %d %x %x\n",
                        data[0], data[1], data[2], data[3], data[4], data[5]);

        if (s->type == CX18_ENC_STREAM_TYPE_VBI)
                cx18_api(cx, CX18_CPU_SET_RAW_VBI_PARAM, 6, data);
}

int cx18_start_v4l2_encode_stream(struct cx18_stream *s)
{
        u32 data[MAX_MB_ARGUMENTS];
        struct cx18 *cx = s->cx;
        struct list_head *p;
        int ts = 0;
        int captype = 0;

        if (s->v4l2dev == NULL && s->dvb.enabled == 0)
                return -EINVAL;

        CX18_DEBUG_INFO("Start encoder stream %s\n", s->name);

        switch (s->type) {
        case CX18_ENC_STREAM_TYPE_MPG:
                captype = CAPTURE_CHANNEL_TYPE_MPEG;
                cx->mpg_data_received = cx->vbi_data_inserted = 0;
                cx->dualwatch_jiffies = jiffies;
                cx->dualwatch_stereo_mode = cx->params.audio_properties & 0x300;
                cx->search_pack_header = 0;
                break;

        case CX18_ENC_STREAM_TYPE_TS:
                captype = CAPTURE_CHANNEL_TYPE_TS;
                ts = 1;
                break;
        case CX18_ENC_STREAM_TYPE_YUV:
                captype = CAPTURE_CHANNEL_TYPE_YUV;
                break;
        case CX18_ENC_STREAM_TYPE_PCM:
                captype = CAPTURE_CHANNEL_TYPE_PCM;
                break;
        case CX18_ENC_STREAM_TYPE_VBI:
                captype = cx->vbi.sliced_in->service_set ?
                    CAPTURE_CHANNEL_TYPE_SLICED_VBI : CAPTURE_CHANNEL_TYPE_VBI;
                cx->vbi.frame = 0;
                cx->vbi.inserted_frame = 0;
                memset(cx->vbi.sliced_mpeg_size,
                        0, sizeof(cx->vbi.sliced_mpeg_size));
                break;
        default:
                return -EINVAL;
        }

        /* mute/unmute video */
        cx18_vapi(cx, CX18_CPU_SET_VIDEO_MUTE, 2,
                  s->handle, !!test_bit(CX18_F_I_RADIO_USER, &cx->i_flags));

        /* Clear Streamoff flags in case left from last capture */
        clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);

        cx18_vapi_result(cx, data, CX18_CREATE_TASK, 1, CPU_CMD_MASK_CAPTURE);
        s->handle = data[0];
        cx18_vapi(cx, CX18_CPU_SET_CHANNEL_TYPE, 2, s->handle, captype);

        if (atomic_read(&cx->ana_capturing) == 0 && !ts) {
                /* Stuff from Windows, we don't know what it is */
                cx18_vapi(cx, CX18_CPU_SET_VER_CROP_LINE, 2, s->handle, 0);
                cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 3, s->handle, 3, 1);
                cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 3, s->handle, 8, 0);
                cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 3, s->handle, 4, 1);
                cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 2, s->handle, 12);

                cx18_vapi(cx, CX18_CPU_SET_CAPTURE_LINE_NO, 3,
                               s->handle, cx->digitizer, cx->digitizer);

                /* Setup VBI */
                if (cx->v4l2_cap & V4L2_CAP_VBI_CAPTURE)
                        cx18_vbi_setup(s);

                /* assign program index info.
                   Mask 7: select I/P/B, Num_req: 400 max */
                cx18_vapi_result(cx, data, CX18_CPU_SET_INDEXTABLE, 1, 0);

                /* Setup API for Stream */
                cx2341x_update(cx, cx18_api_func, NULL, &cx->params);
        }

        if (atomic_read(&cx->tot_capturing) == 0) {
                clear_bit(CX18_F_I_EOS, &cx->i_flags);
                cx18_write_reg(cx, 7, CX18_DSP0_INTERRUPT_MASK);
        }

        cx18_vapi(cx, CX18_CPU_DE_SET_MDL_ACK, 3, s->handle,
                (void __iomem *)&cx->scb->cpu_mdl_ack[s->type][0] - cx->enc_mem,
                (void __iomem *)&cx->scb->cpu_mdl_ack[s->type][1] - cx->enc_mem);

        list_for_each(p, &s->q_free.list) {
                struct cx18_buffer *buf = list_entry(p, struct cx18_buffer, list);

                cx18_writel(cx, buf->dma_handle,
                                        &cx->scb->cpu_mdl[buf->id].paddr);
                cx18_writel(cx, s->buf_size, &cx->scb->cpu_mdl[buf->id].length);
                cx18_vapi(cx, CX18_CPU_DE_SET_MDL, 5, s->handle,
                        (void __iomem *)&cx->scb->cpu_mdl[buf->id] - cx->enc_mem,
                        1, buf->id, s->buf_size);
        }
        /* begin_capture */
        if (cx18_vapi(cx, CX18_CPU_CAPTURE_START, 1, s->handle)) {
                CX18_DEBUG_WARN("Error starting capture!\n");
                /* Ensure we're really not capturing before releasing MDLs */
                if (s->type == CX18_ENC_STREAM_TYPE_MPG)
                        cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 2, s->handle, 1);
                else
                        cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 1, s->handle);
                cx18_vapi(cx, CX18_CPU_DE_RELEASE_MDL, 1, s->handle);
                cx18_vapi(cx, CX18_DESTROY_TASK, 1, s->handle);
                /* FIXME - clean-up DSP0_INT mask, i_flags, s_flags, etc. */
                return -EINVAL;
        }

        /* you're live! sit back and await interrupts :) */
        if (!ts)
                atomic_inc(&cx->ana_capturing);
        atomic_inc(&cx->tot_capturing);
        return 0;
}

void cx18_stop_all_captures(struct cx18 *cx)
{
        int i;

        for (i = CX18_MAX_STREAMS - 1; i >= 0; i--) {
                struct cx18_stream *s = &cx->streams[i];

                if (s->v4l2dev == NULL && s->dvb.enabled == 0)
                        continue;
                if (test_bit(CX18_F_S_STREAMING, &s->s_flags))
                        cx18_stop_v4l2_encode_stream(s, 0);
        }
}

int cx18_stop_v4l2_encode_stream(struct cx18_stream *s, int gop_end)
{
        struct cx18 *cx = s->cx;
        unsigned long then;

        if (s->v4l2dev == NULL && s->dvb.enabled == 0)
                return -EINVAL;

        /* This function assumes that you are allowed to stop the capture
           and that we are actually capturing */

        CX18_DEBUG_INFO("Stop Capture\n");

        if (atomic_read(&cx->tot_capturing) == 0)
                return 0;

        if (s->type == CX18_ENC_STREAM_TYPE_MPG)
                cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 2, s->handle, !gop_end);
        else
                cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 1, s->handle);

        then = jiffies;

        if (s->type == CX18_ENC_STREAM_TYPE_MPG && gop_end) {
                CX18_INFO("ignoring gop_end: not (yet?) supported by the firmware\n");
        }

        if (s->type != CX18_ENC_STREAM_TYPE_TS)
                atomic_dec(&cx->ana_capturing);
        atomic_dec(&cx->tot_capturing);

        /* Clear capture and no-read bits */
        clear_bit(CX18_F_S_STREAMING, &s->s_flags);

        /* Tell the CX23418 it can't use our buffers anymore */
        cx18_vapi(cx, CX18_CPU_DE_RELEASE_MDL, 1, s->handle);

        cx18_vapi(cx, CX18_DESTROY_TASK, 1, s->handle);
        s->handle = CX18_INVALID_TASK_HANDLE;

        if (atomic_read(&cx->tot_capturing) > 0)
                return 0;

        cx18_write_reg(cx, 5, CX18_DSP0_INTERRUPT_MASK);
        wake_up(&s->waitq);

        return 0;
}

u32 cx18_find_handle(struct cx18 *cx)
{
        int i;

        /* find first available handle to be used for global settings */
        for (i = 0; i < CX18_MAX_STREAMS; i++) {
                struct cx18_stream *s = &cx->streams[i];

                if (s->v4l2dev && (s->handle != CX18_INVALID_TASK_HANDLE))
                        return s->handle;
        }
        return CX18_INVALID_TASK_HANDLE;
}

struct cx18_stream *cx18_handle_to_stream(struct cx18 *cx, u32 handle)
{
        int i;
        struct cx18_stream *s;

        if (handle == CX18_INVALID_TASK_HANDLE)
                return NULL;

        for (i = 0; i < CX18_MAX_STREAMS; i++) {
                s = &cx->streams[i];
                if (s->handle != handle)
                        continue;
                if (s->v4l2dev || s->dvb.enabled)
                        return s;
        }
        return NULL;
}