/*
 * Zoran zr36057/zr36067 PCI controller driver, for the
 * Pinnacle/Miro DC10/DC10+/DC30/DC30+, Iomega Buz, Linux
 * Media Labs LML33/LML33R10.
 *
 * This part handles device access (PCI/I2C/codec/...)
 *
 * Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx>
 *
 * Currently maintained by:
 *   Ronald Bultje    <rbultje@ronald.bitfreak.net>
 *   Laurent Pinchart <laurent.pinchart@skynet.be>
 *   Mailinglist      <mjpeg-users@lists.sf.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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/vmalloc.h>

#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include <linux/spinlock.h>
#include <linux/sem.h>

#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/wait.h>

#include <asm/byteorder.h>
#include <asm/io.h>

#include "videocodec.h"
#include "zoran.h"
#include "zoran_device.h"
#include "zoran_card.h"

#define IRQ_MASK ( ZR36057_ISR_GIRQ0 | \
                   ZR36057_ISR_GIRQ1 | \
                   ZR36057_ISR_JPEGRepIRQ )

static int lml33dpath;          /* default = 0
                                 * 1 will use digital path in capture
                                 * mode instead of analog. It can be
                                 * used for picture adjustments using
                                 * tool like xawtv while watching image
                                 * on TV monitor connected to the output.
                                 * However, due to absence of 75 Ohm
                                 * load on Bt819 input, there will be
                                 * some image imperfections */

module_param(lml33dpath, bool, 0644);
MODULE_PARM_DESC(lml33dpath,
                 "Use digital path capture mode (on LML33 cards)");

static void
zr36057_init_vfe (struct zoran *zr);

/*
 * General Purpose I/O and Guest bus access
 */

/*
 * This is a bit tricky. When a board lacks a GPIO function, the corresponding
 * GPIO bit number in the card_info structure is set to 0.
 */

void
GPIO (struct zoran *zr,
      int           bit,
      unsigned int  value)
{
        u32 reg;
        u32 mask;

        /* Make sure the bit number is legal
         * A bit number of -1 (lacking) gives a mask of 0,
         * making it harmless */
        mask = (1 << (24 + bit)) & 0xff000000;
        reg = btread(ZR36057_GPPGCR1) & ~mask;
        if (value) {
                reg |= mask;
        }
        btwrite(reg, ZR36057_GPPGCR1);
        udelay(1);
}

/*
 * Wait til post office is no longer busy
 */

int
post_office_wait (struct zoran *zr)
{
        u32 por;

//      while (((por = btread(ZR36057_POR)) & (ZR36057_POR_POPen | ZR36057_POR_POTime)) == ZR36057_POR_POPen) {
        while ((por = btread(ZR36057_POR)) & ZR36057_POR_POPen) {
                /* wait for something to happen */
        }
        if ((por & ZR36057_POR_POTime) && !zr->card.gws_not_connected) {
                /* In LML33/BUZ \GWS line is not connected, so it has always timeout set */
                dprintk(1, KERN_INFO "%s: pop timeout %08x\n", ZR_DEVNAME(zr),
                        por);
                return -1;
        }

        return 0;
}

int
post_office_write (struct zoran *zr,
                   unsigned int  guest,
                   unsigned int  reg,
                   unsigned int  value)
{
        u32 por;

        por =
            ZR36057_POR_PODir | ZR36057_POR_POTime | ((guest & 7) << 20) |
            ((reg & 7) << 16) | (value & 0xFF);
        btwrite(por, ZR36057_POR);

        return post_office_wait(zr);
}

int
post_office_read (struct zoran *zr,
                  unsigned int  guest,
                  unsigned int  reg)
{
        u32 por;

        por = ZR36057_POR_POTime | ((guest & 7) << 20) | ((reg & 7) << 16);
        btwrite(por, ZR36057_POR);
        if (post_office_wait(zr) < 0) {
                return -1;
        }

        return btread(ZR36057_POR) & 0xFF;
}

/*
 * detect guests
 */

static void
dump_guests (struct zoran *zr)
{
        if (zr36067_debug > 2) {
                int i, guest[8];

                for (i = 1; i < 8; i++) {       // Don't read jpeg codec here
                        guest[i] = post_office_read(zr, i, 0);
                }

                printk(KERN_INFO "%s: Guests:", ZR_DEVNAME(zr));

                for (i = 1; i < 8; i++) {
                        printk(" 0x%02x", guest[i]);
                }
                printk("\n");
        }
}

static inline unsigned long
get_time (void)
{
        struct timeval tv;

        do_gettimeofday(&tv);
        return (1000000 * tv.tv_sec + tv.tv_usec);
}

void
detect_guest_activity (struct zoran *zr)
{
        int timeout, i, j, res, guest[8], guest0[8], change[8][3];
        unsigned long t0, t1;

        dump_guests(zr);
        printk(KERN_INFO "%s: Detecting guests activity, please wait...\n",
               ZR_DEVNAME(zr));
        for (i = 1; i < 8; i++) {       // Don't read jpeg codec here
                guest0[i] = guest[i] = post_office_read(zr, i, 0);
        }

        timeout = 0;
        j = 0;
        t0 = get_time();
        while (timeout < 10000) {
                udelay(10);
                timeout++;
                for (i = 1; (i < 8) && (j < 8); i++) {
                        res = post_office_read(zr, i, 0);
                        if (res != guest[i]) {
                                t1 = get_time();
                                change[j][0] = (t1 - t0);
                                t0 = t1;
                                change[j][1] = i;
                                change[j][2] = res;
                                j++;
                                guest[i] = res;
                        }
                }
                if (j >= 8)
                        break;
        }
        printk(KERN_INFO "%s: Guests:", ZR_DEVNAME(zr));

        for (i = 1; i < 8; i++) {
                printk(" 0x%02x", guest0[i]);
        }
        printk("\n");
        if (j == 0) {
                printk(KERN_INFO "%s: No activity detected.\n", ZR_DEVNAME(zr));
                return;
        }
        for (i = 0; i < j; i++) {
                printk(KERN_INFO "%s: %6d: %d => 0x%02x\n", ZR_DEVNAME(zr),
                       change[i][0], change[i][1], change[i][2]);
        }
}

/*
 * JPEG Codec access
 */

void
jpeg_codec_sleep (struct zoran *zr,
                  int           sleep)
{
        GPIO(zr, zr->card.gpio[ZR_GPIO_JPEG_SLEEP], !sleep);
        if (!sleep) {
                dprintk(3,
                        KERN_DEBUG
                        "%s: jpeg_codec_sleep() - wake GPIO=0x%08x\n",
                        ZR_DEVNAME(zr), btread(ZR36057_GPPGCR1));
                udelay(500);
        } else {
                dprintk(3,
                        KERN_DEBUG
                        "%s: jpeg_codec_sleep() - sleep GPIO=0x%08x\n",
                        ZR_DEVNAME(zr), btread(ZR36057_GPPGCR1));
                udelay(2);
        }
}

int
jpeg_codec_reset (struct zoran *zr)
{
        /* Take the codec out of sleep */
        jpeg_codec_sleep(zr, 0);

        if (zr->card.gpcs[GPCS_JPEG_RESET] != 0xff) {
                post_office_write(zr, zr->card.gpcs[GPCS_JPEG_RESET], 0,
                                  0);
                udelay(2);
        } else {
                GPIO(zr, zr->card.gpio[ZR_GPIO_JPEG_RESET], 0);
                udelay(2);
                GPIO(zr, zr->card.gpio[ZR_GPIO_JPEG_RESET], 1);
                udelay(2);
        }

        return 0;
}

/*
 *   Set the registers for the size we have specified. Don't bother
 *   trying to understand this without the ZR36057 manual in front of
 *   you [AC].
 *
 *   PS: The manual is free for download in .pdf format from
 *   www.zoran.com - nicely done those folks.
 */

static void
zr36057_adjust_vfe (struct zoran          *zr,
                    enum zoran_codec_mode  mode)
{
        u32 reg;

        switch (mode) {
        case BUZ_MODE_MOTION_DECOMPRESS:
                btand(~ZR36057_VFESPFR_ExtFl, ZR36057_VFESPFR);
                reg = btread(ZR36057_VFEHCR);
                if ((reg & (1 << 10)) && zr->card.type != LML33R10) {
                        reg += ((1 << 10) | 1);
                }
                btwrite(reg, ZR36057_VFEHCR);
                break;
        case BUZ_MODE_MOTION_COMPRESS:
        case BUZ_MODE_IDLE:
        default:
                if ((zr->norm & V4L2_STD_NTSC) ||
                    (zr->card.type == LML33R10 &&
                     (zr->norm & V4L2_STD_PAL)))
                        btand(~ZR36057_VFESPFR_ExtFl, ZR36057_VFESPFR);
                else
                        btor(ZR36057_VFESPFR_ExtFl, ZR36057_VFESPFR);
                reg = btread(ZR36057_VFEHCR);
                if (!(reg & (1 << 10)) && zr->card.type != LML33R10) {
                        reg -= ((1 << 10) | 1);
                }
                btwrite(reg, ZR36057_VFEHCR);
                break;
        }
}

/*
 * set geometry
 */

static void
zr36057_set_vfe (struct zoran              *zr,
                 int                        video_width,
                 int                        video_height,
                 const struct zoran_format *format)
{
        struct tvnorm *tvn;
        unsigned HStart, HEnd, VStart, VEnd;
        unsigned DispMode;
        unsigned VidWinWid, VidWinHt;
        unsigned hcrop1, hcrop2, vcrop1, vcrop2;
        unsigned Wa, We, Ha, He;
        unsigned X, Y, HorDcm, VerDcm;
        u32 reg;
        unsigned mask_line_size;

        tvn = zr->timing;

        Wa = tvn->Wa;
        Ha = tvn->Ha;

        dprintk(2, KERN_INFO "%s: set_vfe() - width = %d, height = %d\n",
                ZR_DEVNAME(zr), video_width, video_height);

        if (video_width < BUZ_MIN_WIDTH ||
            video_height < BUZ_MIN_HEIGHT ||
            video_width > Wa || video_height > Ha) {
                dprintk(1, KERN_ERR "%s: set_vfe: w=%d h=%d not valid\n",
                        ZR_DEVNAME(zr), video_width, video_height);
                return;
        }

        /**** zr36057 ****/

        /* horizontal */
        VidWinWid = video_width;
        X = DIV_ROUND_UP(VidWinWid * 64, tvn->Wa);
        We = (VidWinWid * 64) / X;
        HorDcm = 64 - X;
        hcrop1 = 2 * ((tvn->Wa - We) / 4);
        hcrop2 = tvn->Wa - We - hcrop1;
        HStart = tvn->HStart ? tvn->HStart : 1;
        /* (Ronald) Original comment:
         * "| 1 Doesn't have any effect, tested on both a DC10 and a DC10+"
         * this is false. It inverses chroma values on the LML33R10 (so Cr
         * suddenly is shown as Cb and reverse, really cool effect if you
         * want to see blue faces, not useful otherwise). So don't use |1.
         * However, the DC10 has '0' as HStart, but does need |1, so we
         * use a dirty check...
         */
        HEnd = HStart + tvn->Wa - 1;
        HStart += hcrop1;
        HEnd -= hcrop2;
        reg = ((HStart & ZR36057_VFEHCR_Hmask) << ZR36057_VFEHCR_HStart)
            | ((HEnd & ZR36057_VFEHCR_Hmask) << ZR36057_VFEHCR_HEnd);
        if (zr->card.vfe_pol.hsync_pol)
                reg |= ZR36057_VFEHCR_HSPol;
        btwrite(reg, ZR36057_VFEHCR);

        /* Vertical */
        DispMode = !(video_height > BUZ_MAX_HEIGHT / 2);
        VidWinHt = DispMode ? video_height : video_height / 2;
        Y = DIV_ROUND_UP(VidWinHt * 64 * 2, tvn->Ha);
        He = (VidWinHt * 64) / Y;
        VerDcm = 64 - Y;
        vcrop1 = (tvn->Ha / 2 - He) / 2;
        vcrop2 = tvn->Ha / 2 - He - vcrop1;
        VStart = tvn->VStart;
        VEnd = VStart + tvn->Ha / 2;    // - 1; FIXME SnapShot times out with -1 in 768*576 on the DC10 - LP
        VStart += vcrop1;
        VEnd -= vcrop2;
        reg = ((VStart & ZR36057_VFEVCR_Vmask) << ZR36057_VFEVCR_VStart)
            | ((VEnd & ZR36057_VFEVCR_Vmask) << ZR36057_VFEVCR_VEnd);
        if (zr->card.vfe_pol.vsync_pol)
                reg |= ZR36057_VFEVCR_VSPol;
        btwrite(reg, ZR36057_VFEVCR);

        /* scaler and pixel format */
        reg = 0;
        reg |= (HorDcm << ZR36057_VFESPFR_HorDcm);
        reg |= (VerDcm << ZR36057_VFESPFR_VerDcm);
        reg |= (DispMode << ZR36057_VFESPFR_DispMode);
        /* RJ: I don't know, why the following has to be the opposite
         * of the corresponding ZR36060 setting, but only this way
         * we get the correct colors when uncompressing to the screen  */
        //reg |= ZR36057_VFESPFR_VCLKPol; /**/
        /* RJ: Don't know if that is needed for NTSC also */
        if (!(zr->norm & V4L2_STD_NTSC))
                reg |= ZR36057_VFESPFR_ExtFl;   // NEEDED!!!!!!! Wolfgang
        reg |= ZR36057_VFESPFR_TopField;
        if (HorDcm >= 48) {
                reg |= 3 << ZR36057_VFESPFR_HFilter;    /* 5 tap filter */
        } else if (HorDcm >= 32) {
                reg |= 2 << ZR36057_VFESPFR_HFilter;    /* 4 tap filter */
        } else if (HorDcm >= 16) {
                reg |= 1 << ZR36057_VFESPFR_HFilter;    /* 3 tap filter */
        }
        reg |= format->vfespfr;
        btwrite(reg, ZR36057_VFESPFR);

        /* display configuration */
        reg = (16 << ZR36057_VDCR_MinPix)
            | (VidWinHt << ZR36057_VDCR_VidWinHt)
            | (VidWinWid << ZR36057_VDCR_VidWinWid);
        if (pci_pci_problems & PCIPCI_TRITON)
                // || zr->revision < 1) // Revision 1 has also Triton support
                reg &= ~ZR36057_VDCR_Triton;
        else
                reg |= ZR36057_VDCR_Triton;
        btwrite(reg, ZR36057_VDCR);

        /* (Ronald) don't write this if overlay_mask = NULL */
        if (zr->overlay_mask) {
                /* Write overlay clipping mask data, but don't enable overlay clipping */
                /* RJ: since this makes only sense on the screen, we use
                 * zr->overlay_settings.width instead of video_width */

                mask_line_size = (BUZ_MAX_WIDTH + 31) / 32;
                reg = virt_to_bus(zr->overlay_mask);
                btwrite(reg, ZR36057_MMTR);
                reg = virt_to_bus(zr->overlay_mask + mask_line_size);
                btwrite(reg, ZR36057_MMBR);
                reg =
                    mask_line_size - (zr->overlay_settings.width +
                                      31) / 32;
                if (DispMode == 0)
                        reg += mask_line_size;
                reg <<= ZR36057_OCR_MaskStride;
                btwrite(reg, ZR36057_OCR);
        }

        zr36057_adjust_vfe(zr, zr->codec_mode);
}

/*
 * Switch overlay on or off
 */

void
zr36057_overlay (struct zoran *zr,
                 int           on)
{
        u32 reg;

        if (on) {
                /* do the necessary settings ... */
                btand(~ZR36057_VDCR_VidEn, ZR36057_VDCR);       /* switch it off first */

                zr36057_set_vfe(zr,
                                zr->overlay_settings.width,
                                zr->overlay_settings.height,
                                zr->overlay_settings.format);

                /* Start and length of each line MUST be 4-byte aligned.
                 * This should be already checked before the call to this routine.
                 * All error messages are internal driver checking only! */

                /* video display top and bottom registers */
                reg = (long) zr->vbuf_base +
                    zr->overlay_settings.x *
                    ((zr->overlay_settings.format->depth + 7) / 8) +
                    zr->overlay_settings.y *
                    zr->vbuf_bytesperline;
                btwrite(reg, ZR36057_VDTR);
                if (reg & 3)
                        dprintk(1,
                                KERN_ERR
                                "%s: zr36057_overlay() - video_address not aligned\n",
                                ZR_DEVNAME(zr));
                if (zr->overlay_settings.height > BUZ_MAX_HEIGHT / 2)
                        reg += zr->vbuf_bytesperline;
                btwrite(reg, ZR36057_VDBR);

                /* video stride, status, and frame grab register */
                reg = zr->vbuf_bytesperline -
                    zr->overlay_settings.width *
                    ((zr->overlay_settings.format->depth + 7) / 8);
                if (zr->overlay_settings.height > BUZ_MAX_HEIGHT / 2)
                        reg += zr->vbuf_bytesperline;
                if (reg & 3)
                        dprintk(1,
                                KERN_ERR
                                "%s: zr36057_overlay() - video_stride not aligned\n",
                                ZR_DEVNAME(zr));
                reg = (reg << ZR36057_VSSFGR_DispStride);
                reg |= ZR36057_VSSFGR_VidOvf;   /* clear overflow status */
                btwrite(reg, ZR36057_VSSFGR);

                /* Set overlay clipping */
                if (zr->overlay_settings.clipcount > 0)
                        btor(ZR36057_OCR_OvlEnable, ZR36057_OCR);

                /* ... and switch it on */
                btor(ZR36057_VDCR_VidEn, ZR36057_VDCR);
        } else {
                /* Switch it off */
                btand(~ZR36057_VDCR_VidEn, ZR36057_VDCR);
        }
}

/*
 * The overlay mask has one bit for each pixel on a scan line,
 *  and the maximum window size is BUZ_MAX_WIDTH * BUZ_MAX_HEIGHT pixels.
 */

void write_overlay_mask(struct zoran_fh *fh, struct v4l2_clip *vp, int count)
{
        struct zoran *zr = fh->zr;
        unsigned mask_line_size = (BUZ_MAX_WIDTH + 31) / 32;
        u32 *mask;
        int x, y, width, height;
        unsigned i, j, k;
        u32 reg;

        /* fill mask with one bits */
        memset(fh->overlay_mask, ~0, mask_line_size * 4 * BUZ_MAX_HEIGHT);
        reg = 0;

        for (i = 0; i < count; ++i) {
                /* pick up local copy of clip */
                x = vp[i].c.left;
                y = vp[i].c.top;
                width = vp[i].c.width;
                height = vp[i].c.height;

                /* trim clips that extend beyond the window */
                if (x < 0) {
                        width += x;
                        x = 0;
                }
                if (y < 0) {
                        height += y;
                        y = 0;
                }
                if (x + width > fh->overlay_settings.width) {
                        width = fh->overlay_settings.width - x;
                }
                if (y + height > fh->overlay_settings.height) {
                        height = fh->overlay_settings.height - y;
                }

                /* ignore degenerate clips */
                if (height <= 0) {
                        continue;
                }
                if (width <= 0) {
                        continue;
                }

                /* apply clip for each scan line */
                for (j = 0; j < height; ++j) {
                        /* reset bit for each pixel */
                        /* this can be optimized later if need be */
                        mask = fh->overlay_mask + (y + j) * mask_line_size;
                        for (k = 0; k < width; ++k) {
                                mask[(x + k) / 32] &=
                                    ~((u32) 1 << (x + k) % 32);
                        }
                }
        }
}

/* Enable/Disable uncompressed memory grabbing of the 36057 */

void
zr36057_set_memgrab (struct zoran *zr,
                     int           mode)
{
        if (mode) {
                /* We only check SnapShot and not FrameGrab here.  SnapShot==1
                 * means a capture is already in progress, but FrameGrab==1
                 * doesn't necessary mean that.  It's more correct to say a 1
                 * to 0 transition indicates a capture completed.  If a
                 * capture is pending when capturing is tuned off, FrameGrab
                 * will be stuck at 1 until capturing is turned back on.
                 */
                if (btread(ZR36057_VSSFGR) & ZR36057_VSSFGR_SnapShot)
                        dprintk(1,
                                KERN_WARNING
                                "%s: zr36057_set_memgrab(1) with SnapShot on!?\n",
                                ZR_DEVNAME(zr));

                /* switch on VSync interrupts */
                btwrite(IRQ_MASK, ZR36057_ISR); // Clear Interrupts
                btor(zr->card.vsync_int, ZR36057_ICR);  // SW

                /* enable SnapShot */
                btor(ZR36057_VSSFGR_SnapShot, ZR36057_VSSFGR);

                /* Set zr36057 video front end  and enable video */
                zr36057_set_vfe(zr, zr->v4l_settings.width,
                                zr->v4l_settings.height,
                                zr->v4l_settings.format);

                zr->v4l_memgrab_active = 1;
        } else {
                /* switch off VSync interrupts */
                btand(~zr->card.vsync_int, ZR36057_ICR);        // SW

                zr->v4l_memgrab_active = 0;
                zr->v4l_grab_frame = NO_GRAB_ACTIVE;

                /* reenable grabbing to screen if it was running */
                if (zr->v4l_overlay_active) {
                        zr36057_overlay(zr, 1);
                } else {
                        btand(~ZR36057_VDCR_VidEn, ZR36057_VDCR);
                        btand(~ZR36057_VSSFGR_SnapShot, ZR36057_VSSFGR);
                }
        }
}

int
wait_grab_pending (struct zoran *zr)
{
        unsigned long flags;

        /* wait until all pending grabs are finished */

        if (!zr->v4l_memgrab_active)
                return 0;

        wait_event_interruptible(zr->v4l_capq,
                        (zr->v4l_pend_tail == zr->v4l_pend_head));
        if (signal_pending(current))
                return -ERESTARTSYS;

        spin_lock_irqsave(&zr->spinlock, flags);
        zr36057_set_memgrab(zr, 0);
        spin_unlock_irqrestore(&zr->spinlock, flags);

        return 0;
}

/*****************************************************************************
 *                                                                           *
 *  Set up the Buz-specific MJPEG part                                       *
 *                                                                           *
 *****************************************************************************/

static inline void
set_frame (struct zoran *zr,
           int           val)
{
        GPIO(zr, zr->card.gpio[ZR_GPIO_JPEG_FRAME], val);
}

static void
set_videobus_dir (struct zoran *zr,
                  int           val)
{
        switch (zr->card.type) {
        case LML33:
        case LML33R10:
                if (lml33dpath == 0)
                        GPIO(zr, 5, val);
                else
                        GPIO(zr, 5, 1);
                break;
        default:
                GPIO(zr, zr->card.gpio[ZR_GPIO_VID_DIR],
                     zr->card.gpio_pol[ZR_GPIO_VID_DIR] ? !val : val);
                break;
        }
}

static void
init_jpeg_queue (struct zoran *zr)
{
        int i;

        /* re-initialize DMA ring stuff */
        zr->jpg_que_head = 0;
        zr->jpg_dma_head = 0;
        zr->jpg_dma_tail = 0;
        zr->jpg_que_tail = 0;
        zr->jpg_seq_num = 0;
        zr->JPEG_error = 0;
        zr->num_errors = 0;
        zr->jpg_err_seq = 0;
        zr->jpg_err_shift = 0;
        zr->jpg_queued_num = 0;
        for (i = 0; i < zr->jpg_buffers.num_buffers; i++) {
                zr->jpg_buffers.buffer[i].state = BUZ_STATE_USER;       /* nothing going on */
        }
        for (i = 0; i < BUZ_NUM_STAT_COM; i++) {
                zr->stat_com[i] = cpu_to_le32(1);       /* mark as unavailable to zr36057 */
        }
}

static void
zr36057_set_jpg (struct zoran          *zr,
                 enum zoran_codec_mode  mode)
{
        struct tvnorm *tvn;
        u32 reg;

        tvn = zr->timing;

        /* assert P_Reset, disable code transfer, deassert Active */
        btwrite(0, ZR36057_JPC);

        /* MJPEG compression mode */
        switch (mode) {

        case BUZ_MODE_MOTION_COMPRESS:
        default:
                reg = ZR36057_JMC_MJPGCmpMode;
                break;

        case BUZ_MODE_MOTION_DECOMPRESS:
                reg = ZR36057_JMC_MJPGExpMode;
                reg |= ZR36057_JMC_SyncMstr;
                /* RJ: The following is experimental - improves the output to screen */
                //if(zr->jpg_settings.VFIFO_FB) reg |= ZR36057_JMC_VFIFO_FB; // No, it doesn't. SM
                break;

        case BUZ_MODE_STILL_COMPRESS:
                reg = ZR36057_JMC_JPGCmpMode;
                break;

        case BUZ_MODE_STILL_DECOMPRESS:
                reg = ZR36057_JMC_JPGExpMode;
                break;

        }
        reg |= ZR36057_JMC_JPG;
        if (zr->jpg_settings.field_per_buff == 1)
                reg |= ZR36057_JMC_Fld_per_buff;
        btwrite(reg, ZR36057_JMC);

        /* vertical */
        btor(ZR36057_VFEVCR_VSPol, ZR36057_VFEVCR);
        reg = (6 << ZR36057_VSP_VsyncSize) |
              (tvn->Ht << ZR36057_VSP_FrmTot);
        btwrite(reg, ZR36057_VSP);
        reg = ((zr->jpg_settings.img_y + tvn->VStart) << ZR36057_FVAP_NAY) |
              (zr->jpg_settings.img_height << ZR36057_FVAP_PAY);
        btwrite(reg, ZR36057_FVAP);

        /* horizontal */
        if (zr->card.vfe_pol.hsync_pol)
                btor(ZR36057_VFEHCR_HSPol, ZR36057_VFEHCR);
        else
                btand(~ZR36057_VFEHCR_HSPol, ZR36057_VFEHCR);
        reg = ((tvn->HSyncStart) << ZR36057_HSP_HsyncStart) |
              (tvn->Wt << ZR36057_HSP_LineTot);
        btwrite(reg, ZR36057_HSP);
        reg = ((zr->jpg_settings.img_x +
                tvn->HStart + 4) << ZR36057_FHAP_NAX) |
              (zr->jpg_settings.img_width << ZR36057_FHAP_PAX);
        btwrite(reg, ZR36057_FHAP);

        /* field process parameters */
        if (zr->jpg_settings.odd_even)
                reg = ZR36057_FPP_Odd_Even;
        else
                reg = 0;

        btwrite(reg, ZR36057_FPP);

        /* Set proper VCLK Polarity, else colors will be wrong during playback */
        //btor(ZR36057_VFESPFR_VCLKPol, ZR36057_VFESPFR);

        /* code base address */
        reg = virt_to_bus(zr->stat_com);
        btwrite(reg, ZR36057_JCBA);

        /* FIFO threshold (FIFO is 160. double words) */
        /* NOTE: decimal values here */
        switch (mode) {

        case BUZ_MODE_STILL_COMPRESS:
        case BUZ_MODE_MOTION_COMPRESS:
                if (zr->card.type != BUZ)
                        reg = 140;
                else
                        reg = 60;
                break;

        case BUZ_MODE_STILL_DECOMPRESS:
        case BUZ_MODE_MOTION_DECOMPRESS:
                reg = 20;
                break;

        default:
                reg = 80;
                break;

        }
        btwrite(reg, ZR36057_JCFT);
        zr36057_adjust_vfe(zr, mode);

}

void
print_interrupts (struct zoran *zr)
{
        int res, noerr = 0;

        printk(KERN_INFO "%s: interrupts received:", ZR_DEVNAME(zr));
        if ((res = zr->field_counter) < -1 || res > 1) {
                printk(" FD:%d", res);
        }
        if ((res = zr->intr_counter_GIRQ1) != 0) {
                printk(" GIRQ1:%d", res);
                noerr++;
        }
        if ((res = zr->intr_counter_GIRQ0) != 0) {
                printk(" GIRQ0:%d", res);
                noerr++;
        }
        if ((res = zr->intr_counter_CodRepIRQ) != 0) {
                printk(" CodRepIRQ:%d", res);
                noerr++;
        }
        if ((res = zr->intr_counter_JPEGRepIRQ) != 0) {
                printk(" JPEGRepIRQ:%d", res);
                noerr++;
        }
        if (zr->JPEG_max_missed) {
                printk(" JPEG delays: max=%d min=%d", zr->JPEG_max_missed,
                       zr->JPEG_min_missed);
        }
        if (zr->END_event_missed) {
                printk(" ENDs missed: %d", zr->END_event_missed);
        }
        //if (zr->jpg_queued_num) {
        printk(" queue_state=%ld/%ld/%ld/%ld", zr->jpg_que_tail,
               zr->jpg_dma_tail, zr->jpg_dma_head, zr->jpg_que_head);
        //}
        if (!noerr) {
                printk(": no interrupts detected.");
        }
        printk("\n");
}

void
clear_interrupt_counters (struct zoran *zr)
{
        zr->intr_counter_GIRQ1 = 0;
        zr->intr_counter_GIRQ0 = 0;
        zr->intr_counter_CodRepIRQ = 0;
        zr->intr_counter_JPEGRepIRQ = 0;
        zr->field_counter = 0;
        zr->IRQ1_in = 0;
        zr->IRQ1_out = 0;
        zr->JPEG_in = 0;
        zr->JPEG_out = 0;
        zr->JPEG_0 = 0;
        zr->JPEG_1 = 0;
        zr->END_event_missed = 0;
        zr->JPEG_missed = 0;
        zr->JPEG_max_missed = 0;
        zr->JPEG_min_missed = 0x7fffffff;
}

static u32
count_reset_interrupt (struct zoran *zr)
{
        u32 isr;

        if ((isr = btread(ZR36057_ISR) & 0x78000000)) {
                if (isr & ZR36057_ISR_GIRQ1) {
                        btwrite(ZR36057_ISR_GIRQ1, ZR36057_ISR);
                        zr->intr_counter_GIRQ1++;
                }
                if (isr & ZR36057_ISR_GIRQ0) {
                        btwrite(ZR36057_ISR_GIRQ0, ZR36057_ISR);
                        zr->intr_counter_GIRQ0++;
                }
                if (isr & ZR36057_ISR_CodRepIRQ) {
                        btwrite(ZR36057_ISR_CodRepIRQ, ZR36057_ISR);
                        zr->intr_counter_CodRepIRQ++;
                }
                if (isr & ZR36057_ISR_JPEGRepIRQ) {
                        btwrite(ZR36057_ISR_JPEGRepIRQ, ZR36057_ISR);
                        zr->intr_counter_JPEGRepIRQ++;
                }
        }
        return isr;
}

void
jpeg_start (struct zoran *zr)
{
        int reg;

        zr->frame_num = 0;

        /* deassert P_reset, disable code transfer, deassert Active */
        btwrite(ZR36057_JPC_P_Reset, ZR36057_JPC);
        /* stop flushing the internal code buffer */
        btand(~ZR36057_MCTCR_CFlush, ZR36057_MCTCR);
        /* enable code transfer */
        btor(ZR36057_JPC_CodTrnsEn, ZR36057_JPC);

        /* clear IRQs */
        btwrite(IRQ_MASK, ZR36057_ISR);
        /* enable the JPEG IRQs */
        btwrite(zr->card.jpeg_int |
                        ZR36057_ICR_JPEGRepIRQ |
                        ZR36057_ICR_IntPinEn,
                ZR36057_ICR);

        set_frame(zr, 0);       // \FRAME

        /* set the JPEG codec guest ID */
        reg = (zr->card.gpcs[1] << ZR36057_JCGI_JPEGuestID) |
               (0 << ZR36057_JCGI_JPEGuestReg);
        btwrite(reg, ZR36057_JCGI);

        if (zr->card.video_vfe == CODEC_TYPE_ZR36016 &&
            zr->card.video_codec == CODEC_TYPE_ZR36050) {
                /* Enable processing on the ZR36016 */
                if (zr->vfe)
                        zr36016_write(zr->vfe, 0, 1);

                /* load the address of the GO register in the ZR36050 latch */
                post_office_write(zr, 0, 0, 0);
        }

        /* assert Active */
        btor(ZR36057_JPC_Active, ZR36057_JPC);

        /* enable the Go generation */
        btor(ZR36057_JMC_Go_en, ZR36057_JMC);
        udelay(30);

        set_frame(zr, 1);       // /FRAME

        dprintk(3, KERN_DEBUG "%s: jpeg_start\n", ZR_DEVNAME(zr));
}

void
zr36057_enable_jpg (struct zoran          *zr,
                    enum zoran_codec_mode  mode)
{
        struct vfe_settings cap;
        int field_size =
            zr->jpg_buffers.buffer_size / zr->jpg_settings.field_per_buff;

        zr->codec_mode = mode;

        cap.x = zr->jpg_settings.img_x;
        cap.y = zr->jpg_settings.img_y;
        cap.width = zr->jpg_settings.img_width;
        cap.height = zr->jpg_settings.img_height;
        cap.decimation =
            zr->jpg_settings.HorDcm | (zr->jpg_settings.VerDcm << 8);
        cap.quality = zr->jpg_settings.jpg_comp.quality;

        switch (mode) {

        case BUZ_MODE_MOTION_COMPRESS: {
                struct jpeg_app_marker app;
                struct jpeg_com_marker com;

                /* In motion compress mode, the decoder output must be enabled, and
                 * the video bus direction set to input.
                 */
                set_videobus_dir(zr, 0);
                decoder_call(zr, video, s_stream, 1);
                encoder_call(zr, video, s_routing, 0, 0, 0);

                /* Take the JPEG codec and the VFE out of sleep */
                jpeg_codec_sleep(zr, 0);

                /* set JPEG app/com marker */
                app.appn = zr->jpg_settings.jpg_comp.APPn;
                app.len = zr->jpg_settings.jpg_comp.APP_len;
                memcpy(app.data, zr->jpg_settings.jpg_comp.APP_data, 60);
                zr->codec->control(zr->codec, CODEC_S_JPEG_APP_DATA,
                                   sizeof(struct jpeg_app_marker), &app);

                com.len = zr->jpg_settings.jpg_comp.COM_len;
                memcpy(com.data, zr->jpg_settings.jpg_comp.COM_data, 60);
                zr->codec->control(zr->codec, CODEC_S_JPEG_COM_DATA,
                                   sizeof(struct jpeg_com_marker), &com);

                /* Setup the JPEG codec */
                zr->codec->control(zr->codec, CODEC_S_JPEG_TDS_BYTE,
                                   sizeof(int), &field_size);
                zr->codec->set_video(zr->codec, zr->timing, &cap,
                                     &zr->card.vfe_pol);
                zr->codec->set_mode(zr->codec, CODEC_DO_COMPRESSION);

                /* Setup the VFE */
                if (zr->vfe) {
                        zr->vfe->control(zr->vfe, CODEC_S_JPEG_TDS_BYTE,
                                         sizeof(int), &field_size);
                        zr->vfe->set_video(zr->vfe, zr->timing, &cap,
                                           &zr->card.vfe_pol);
                        zr->vfe->set_mode(zr->vfe, CODEC_DO_COMPRESSION);
                }

                init_jpeg_queue(zr);
                zr36057_set_jpg(zr, mode);      // \P_Reset, ... Video param, FIFO

                clear_interrupt_counters(zr);
                dprintk(2, KERN_INFO "%s: enable_jpg(MOTION_COMPRESS)\n",
                        ZR_DEVNAME(zr));
                break;
        }

        case BUZ_MODE_MOTION_DECOMPRESS:
                /* In motion decompression mode, the decoder output must be disabled, and
                 * the video bus direction set to output.
                 */
                decoder_call(zr, video, s_stream, 0);
                set_videobus_dir(zr, 1);
                encoder_call(zr, video, s_routing, 1, 0, 0);

                /* Take the JPEG codec and the VFE out of sleep */
                jpeg_codec_sleep(zr, 0);
                /* Setup the VFE */
                if (zr->vfe) {
                        zr->vfe->set_video(zr->vfe, zr->timing, &cap,
                                           &zr->card.vfe_pol);
                        zr->vfe->set_mode(zr->vfe, CODEC_DO_EXPANSION);
                }
                /* Setup the JPEG codec */
                zr->codec->set_video(zr->codec, zr->timing, &cap,
                                     &zr->card.vfe_pol);
                zr->codec->set_mode(zr->codec, CODEC_DO_EXPANSION);

                init_jpeg_queue(zr);
                zr36057_set_jpg(zr, mode);      // \P_Reset, ... Video param, FIFO

                clear_interrupt_counters(zr);
                dprintk(2, KERN_INFO "%s: enable_jpg(MOTION_DECOMPRESS)\n",
                        ZR_DEVNAME(zr));
                break;

        case BUZ_MODE_IDLE:
        default:
                /* shut down processing */
                btand(~(zr->card.jpeg_int | ZR36057_ICR_JPEGRepIRQ),
                      ZR36057_ICR);
                btwrite(zr->card.jpeg_int | ZR36057_ICR_JPEGRepIRQ,
                        ZR36057_ISR);
                btand(~ZR36057_JMC_Go_en, ZR36057_JMC); // \Go_en

                msleep(50);

                set_videobus_dir(zr, 0);
                set_frame(zr, 1);       // /FRAME
                btor(ZR36057_MCTCR_CFlush, ZR36057_MCTCR);      // /CFlush
                btwrite(0, ZR36057_JPC);        // \P_Reset,\CodTrnsEn,\Active
                btand(~ZR36057_JMC_VFIFO_FB, ZR36057_JMC);
                btand(~ZR36057_JMC_SyncMstr, ZR36057_JMC);
                jpeg_codec_reset(zr);
                jpeg_codec_sleep(zr, 1);
                zr36057_adjust_vfe(zr, mode);

                decoder_call(zr, video, s_stream, 1);
                encoder_call(zr, video, s_routing, 0, 0, 0);

                dprintk(2, KERN_INFO "%s: enable_jpg(IDLE)\n", ZR_DEVNAME(zr));
                break;

        }
}

/* when this is called the spinlock must be held */
void
zoran_feed_stat_com (struct zoran *zr)
{
        /* move frames from pending queue to DMA */

        int frame, i, max_stat_com;

        max_stat_com =
            (zr->jpg_settings.TmpDcm ==
             1) ? BUZ_NUM_STAT_COM : (BUZ_NUM_STAT_COM >> 1);

        while ((zr->jpg_dma_head - zr->jpg_dma_tail) < max_stat_com &&
               zr->jpg_dma_head < zr->jpg_que_head) {

                frame = zr->jpg_pend[zr->jpg_dma_head & BUZ_MASK_FRAME];
                if (zr->jpg_settings.TmpDcm == 1) {
                        /* fill 1 stat_com entry */
                        i = (zr->jpg_dma_head -
                             zr->jpg_err_shift) & BUZ_MASK_STAT_COM;
                        if (!(zr->stat_com[i] & cpu_to_le32(1)))
                                break;
                        zr->stat_com[i] =
                            cpu_to_le32(zr->jpg_buffers.buffer[frame].jpg.frag_tab_bus);
                } else {
                        /* fill 2 stat_com entries */
                        i = ((zr->jpg_dma_head -
                              zr->jpg_err_shift) & 1) * 2;
                        if (!(zr->stat_com[i] & cpu_to_le32(1)))
                                break;
                        zr->stat_com[i] =
                            cpu_to_le32(zr->jpg_buffers.buffer[frame].jpg.frag_tab_bus);
                        zr->stat_com[i + 1] =
                            cpu_to_le32(zr->jpg_buffers.buffer[frame].jpg.frag_tab_bus);
                }
                zr->jpg_buffers.buffer[frame].state = BUZ_STATE_DMA;
                zr->jpg_dma_head++;

        }
        if (zr->codec_mode == BUZ_MODE_MOTION_DECOMPRESS)
                zr->jpg_queued_num++;
}

/* when this is called the spinlock must be held */
static void
zoran_reap_stat_com (struct zoran *zr)
{
        /* move frames from DMA queue to done queue */

        int i;
        u32 stat_com;
        unsigned int seq;
        unsigned int dif;
        struct zoran_buffer *buffer;
        int frame;

        /* In motion decompress we don't have a hardware frame counter,
         * we just count the interrupts here */

        if (zr->codec_mode == BUZ_MODE_MOTION_DECOMPRESS) {
                zr->jpg_seq_num++;
        }
        while (zr->jpg_dma_tail < zr->jpg_dma_head) {
                if (zr->jpg_settings.TmpDcm == 1)
                        i = (zr->jpg_dma_tail -
                             zr->jpg_err_shift) & BUZ_MASK_STAT_COM;
                else
                        i = ((zr->jpg_dma_tail -
                              zr->jpg_err_shift) & 1) * 2 + 1;

                stat_com = le32_to_cpu(zr->stat_com[i]);

                if ((stat_com & 1) == 0) {
                        return;
                }
                frame = zr->jpg_pend[zr->jpg_dma_tail & BUZ_MASK_FRAME];
                buffer = &zr->jpg_buffers.buffer[frame];
                do_gettimeofday(&buffer->bs.timestamp);

                if (zr->codec_mode == BUZ_MODE_MOTION_COMPRESS) {
                        buffer->bs.length = (stat_com & 0x7fffff) >> 1;

                        /* update sequence number with the help of the counter in stat_com */

                        seq = ((stat_com >> 24) + zr->jpg_err_seq) & 0xff;
                        dif = (seq - zr->jpg_seq_num) & 0xff;
                        zr->jpg_seq_num += dif;
                } else {
                        buffer->bs.length = 0;
                }
                buffer->bs.seq =
                    zr->jpg_settings.TmpDcm ==
                    2 ? (zr->jpg_seq_num >> 1) : zr->jpg_seq_num;
                buffer->state = BUZ_STATE_DONE;

                zr->jpg_dma_tail++;
        }
}

static void zoran_restart(struct zoran *zr)
{
        /* Now the stat_comm buffer is ready for restart */
        unsigned int status = 0;
        int mode;

        if (zr->codec_mode == BUZ_MODE_MOTION_COMPRESS) {
                decoder_call(zr, video, g_input_status, &status);
                mode = CODEC_DO_COMPRESSION;
        } else {
                status = V4L2_IN_ST_NO_SIGNAL;
                mode = CODEC_DO_EXPANSION;
        }
        if (zr->codec_mode == BUZ_MODE_MOTION_DECOMPRESS ||
            !(status & V4L2_IN_ST_NO_SIGNAL)) {
                /********** RESTART code *************/
                jpeg_codec_reset(zr);
                zr->codec->set_mode(zr->codec, mode);
                zr36057_set_jpg(zr, zr->codec_mode);
                jpeg_start(zr);

                if (zr->num_errors <= 8)
                        dprintk(2, KERN_INFO "%s: Restart\n",
                                ZR_DEVNAME(zr));

                zr->JPEG_missed = 0;
                zr->JPEG_error = 2;
                /********** End RESTART code ***********/
        }
}

static void
error_handler (struct zoran *zr,
               u32           astat,
               u32           stat)
{
        int i;

        /* This is JPEG error handling part */
        if (zr->codec_mode != BUZ_MODE_MOTION_COMPRESS &&
            zr->codec_mode != BUZ_MODE_MOTION_DECOMPRESS) {
                return;
        }

        if ((stat & 1) == 0 &&
            zr->codec_mode == BUZ_MODE_MOTION_COMPRESS &&
            zr->jpg_dma_tail - zr->jpg_que_tail >= zr->jpg_buffers.num_buffers) {
                /* No free buffers... */
                zoran_reap_stat_com(zr);
                zoran_feed_stat_com(zr);
                wake_up_interruptible(&zr->jpg_capq);
                zr->JPEG_missed = 0;
                return;
        }

        if (zr->JPEG_error == 1) {
                zoran_restart(zr);
                return;
        }

        /*
         * First entry: error just happened during normal operation
         *
         * In BUZ_MODE_MOTION_COMPRESS:
         *
         * Possible glitch in TV signal. In this case we should
         * stop the codec and wait for good quality signal before
         * restarting it to avoid further problems
         *
         * In BUZ_MODE_MOTION_DECOMPRESS:
         *
         * Bad JPEG frame: we have to mark it as processed (codec crashed
         * and was not able to do it itself), and to remove it from queue.
         */
        btand(~ZR36057_JMC_Go_en, ZR36057_JMC);
        udelay(1);
        stat = stat | (post_office_read(zr, 7, 0) & 3) << 8;
        btwrite(0, ZR36057_JPC);
        btor(ZR36057_MCTCR_CFlush, ZR36057_MCTCR);
        jpeg_codec_reset(zr);
        jpeg_codec_sleep(zr, 1);
        zr->JPEG_error = 1;
        zr->num_errors++;

        /* Report error */
        if (zr36067_debug > 1 && zr->num_errors <= 8) {
                long frame;
                int j;

                frame = zr->jpg_pend[zr->jpg_dma_tail & BUZ_MASK_FRAME];
                printk(KERN_ERR
                       "%s: JPEG error stat=0x%08x(0x%08x) queue_state=%ld/%ld/%ld/%ld seq=%ld frame=%ld. Codec stopped. ",
                       ZR_DEVNAME(zr), stat, zr->last_isr,
                       zr->jpg_que_tail, zr->jpg_dma_tail,
                       zr->jpg_dma_head, zr->jpg_que_head,
                       zr->jpg_seq_num, frame);
                printk(KERN_INFO "stat_com frames:");
                for (j = 0; j < BUZ_NUM_STAT_COM; j++) {
                        for (i = 0; i < zr->jpg_buffers.num_buffers; i++) {
                                if (le32_to_cpu(zr->stat_com[j]) == zr->jpg_buffers.buffer[i].jpg.frag_tab_bus)
                                        printk(KERN_CONT "% d->%d", j, i);
                        }
                }
                printk(KERN_CONT "\n");
        }
        /* Find an entry in stat_com and rotate contents */
        if (zr->jpg_settings.TmpDcm == 1)
                i = (zr->jpg_dma_tail - zr->jpg_err_shift) & BUZ_MASK_STAT_COM;
        else
                i = ((zr->jpg_dma_tail - zr->jpg_err_shift) & 1) * 2;
        if (zr->codec_mode == BUZ_MODE_MOTION_DECOMPRESS) {
                /* Mimic zr36067 operation */
                zr->stat_com[i] |= cpu_to_le32(1);
                if (zr->jpg_settings.TmpDcm != 1)
                        zr->stat_com[i + 1] |= cpu_to_le32(1);
                /* Refill */
                zoran_reap_stat_com(zr);
                zoran_feed_stat_com(zr);
                wake_up_interruptible(&zr->jpg_capq);
                /* Find an entry in stat_com again after refill */
                if (zr->jpg_settings.TmpDcm == 1)
                        i = (zr->jpg_dma_tail - zr->jpg_err_shift) & BUZ_MASK_STAT_COM;
                else
                        i = ((zr->jpg_dma_tail - zr->jpg_err_shift) & 1) * 2;
        }
        if (i) {
                /* Rotate stat_comm entries to make current entry first */
                int j;
                __le32 bus_addr[BUZ_NUM_STAT_COM];

                /* Here we are copying the stat_com array, which
                 * is already in little endian format, so
                 * no endian conversions here
                 */
                memcpy(bus_addr, zr->stat_com, sizeof(bus_addr));

                for (j = 0; j < BUZ_NUM_STAT_COM; j++)
                        zr->stat_com[j] = bus_addr[(i + j) & BUZ_MASK_STAT_COM];

                zr->jpg_err_shift += i;
                zr->jpg_err_shift &= BUZ_MASK_STAT_COM;
        }
        if (zr->codec_mode == BUZ_MODE_MOTION_COMPRESS)
                zr->jpg_err_seq = zr->jpg_seq_num;      /* + 1; */
        zoran_restart(zr);
}

irqreturn_t
zoran_irq (int             irq,
           void           *dev_id)
{
        u32 stat, astat;
        int count;
        struct zoran *zr;
        unsigned long flags;

        zr = dev_id;
        count = 0;

        if (zr->testing) {
                /* Testing interrupts */
                spin_lock_irqsave(&zr->spinlock, flags);
                while ((stat = count_reset_interrupt(zr))) {
                        if (count++ > 100) {
                                btand(~ZR36057_ICR_IntPinEn, ZR36057_ICR);
                                dprintk(1,
                                        KERN_ERR
                                        "%s: IRQ lockup while testing, isr=0x%08x, cleared int mask\n",
                                        ZR_DEVNAME(zr), stat);
                                wake_up_interruptible(&zr->test_q);
                        }
                }
                zr->last_isr = stat;
                spin_unlock_irqrestore(&zr->spinlock, flags);
                return IRQ_HANDLED;
        }

        spin_lock_irqsave(&zr->spinlock, flags);
        while (1) {
                /* get/clear interrupt status bits */
                stat = count_reset_interrupt(zr);
                astat = stat & IRQ_MASK;
                if (!astat) {
                        break;
                }
                dprintk(4,
                        KERN_DEBUG
                        "zoran_irq: astat: 0x%08x, mask: 0x%08x\n",
                        astat, btread(ZR36057_ICR));
                if (astat & zr->card.vsync_int) {       // SW

                        if (zr->codec_mode == BUZ_MODE_MOTION_DECOMPRESS ||
                            zr->codec_mode == BUZ_MODE_MOTION_COMPRESS) {
                                /* count missed interrupts */
                                zr->JPEG_missed++;
                        }
                        //post_office_read(zr,1,0);
                        /* Interrupts may still happen when
                         * zr->v4l_memgrab_active is switched off.
                         * We simply ignore them */

                        if (zr->v4l_memgrab_active) {
                                /* A lot more checks should be here ... */
                                if ((btread(ZR36057_VSSFGR) & ZR36057_VSSFGR_SnapShot) == 0)
                                        dprintk(1,
                                                KERN_WARNING
                                                "%s: BuzIRQ with SnapShot off ???\n",
                                                ZR_DEVNAME(zr));

                                if (zr->v4l_grab_frame != NO_GRAB_ACTIVE) {
                                        /* There is a grab on a frame going on, check if it has finished */
                                        if ((btread(ZR36057_VSSFGR) & ZR36057_VSSFGR_FrameGrab) == 0) {
                                                /* it is finished, notify the user */

                                                zr->v4l_buffers.buffer[zr->v4l_grab_frame].state = BUZ_STATE_DONE;
                                                zr->v4l_buffers.buffer[zr->v4l_grab_frame].bs.seq = zr->v4l_grab_seq;
                                                do_gettimeofday(&zr->v4l_buffers.buffer[zr->v4l_grab_frame].bs.timestamp);
                                                zr->v4l_grab_frame = NO_GRAB_ACTIVE;
                                                zr->v4l_pend_tail++;
                                        }
                                }

                                if (zr->v4l_grab_frame == NO_GRAB_ACTIVE)
                                        wake_up_interruptible(&zr->v4l_capq);

                                /* Check if there is another grab queued */

                                if (zr->v4l_grab_frame == NO_GRAB_ACTIVE &&
                                    zr->v4l_pend_tail != zr->v4l_pend_head) {
                                        int frame = zr->v4l_pend[zr->v4l_pend_tail & V4L_MASK_FRAME];
                                        u32 reg;

                                        zr->v4l_grab_frame = frame;

                                        /* Set zr36057 video front end and enable video */

                                        /* Buffer address */

                                        reg = zr->v4l_buffers.buffer[frame].v4l.fbuffer_bus;
                                        btwrite(reg, ZR36057_VDTR);
                                        if (zr->v4l_settings.height > BUZ_MAX_HEIGHT / 2)
                                                reg += zr->v4l_settings.bytesperline;
                                        btwrite(reg, ZR36057_VDBR);

                                        /* video stride, status, and frame grab register */
                                        reg = 0;
                                        if (zr->v4l_settings.height > BUZ_MAX_HEIGHT / 2)
                                                reg += zr->v4l_settings.bytesperline;
                                        reg = (reg << ZR36057_VSSFGR_DispStride);
                                        reg |= ZR36057_VSSFGR_VidOvf;
                                        reg |= ZR36057_VSSFGR_SnapShot;
                                        reg |= ZR36057_VSSFGR_FrameGrab;
                                        btwrite(reg, ZR36057_VSSFGR);

                                        btor(ZR36057_VDCR_VidEn,
                                             ZR36057_VDCR);
                                }
                        }

                        /* even if we don't grab, we do want to increment
                         * the sequence counter to see lost frames */
                        zr->v4l_grab_seq++;
                }
#if (IRQ_MASK & ZR36057_ISR_CodRepIRQ)
                if (astat & ZR36057_ISR_CodRepIRQ) {
                        zr->intr_counter_CodRepIRQ++;
                        IDEBUG(printk(KERN_DEBUG "%s: ZR36057_ISR_CodRepIRQ\n",
                                ZR_DEVNAME(zr)));
                        btand(~ZR36057_ICR_CodRepIRQ, ZR36057_ICR);
                }
#endif                          /* (IRQ_MASK & ZR36057_ISR_CodRepIRQ) */

#if (IRQ_MASK & ZR36057_ISR_JPEGRepIRQ)
                if ((astat & ZR36057_ISR_JPEGRepIRQ) &&
                    (zr->codec_mode == BUZ_MODE_MOTION_DECOMPRESS ||
                     zr->codec_mode == BUZ_MODE_MOTION_COMPRESS)) {
                        if (zr36067_debug > 1 && (!zr->frame_num || zr->JPEG_error)) {
                                char sv[BUZ_NUM_STAT_COM + 1];
                                int i;

                                printk(KERN_INFO
                                       "%s: first frame ready: state=0x%08x odd_even=%d field_per_buff=%d delay=%d\n",
                                       ZR_DEVNAME(zr), stat,
                                       zr->jpg_settings.odd_even,
                                       zr->jpg_settings.field_per_buff,
                                       zr->JPEG_missed);

                                for (i = 0; i < BUZ_NUM_STAT_COM; i++)
                                        sv[i] = le32_to_cpu(zr->stat_com[i]) & 1 ? '1' : '0';
                                sv[BUZ_NUM_STAT_COM] = 0;
                                printk(KERN_INFO
                                       "%s: stat_com=%s queue_state=%ld/%ld/%ld/%ld\n",
                                       ZR_DEVNAME(zr), sv,
                                       zr->jpg_que_tail,
                                       zr->jpg_dma_tail,
                                       zr->jpg_dma_head,
                                       zr->jpg_que_head);
                        } else {
                                /* Get statistics */
                                if (zr->JPEG_missed > zr->JPEG_max_missed)
                                        zr->JPEG_max_missed = zr->JPEG_missed;
                                if (zr->JPEG_missed < zr->JPEG_min_missed)
                                        zr->JPEG_min_missed = zr->JPEG_missed;
                        }

                        if (zr36067_debug > 2 && zr->frame_num < 6) {
                                int i;

                                printk(KERN_INFO "%s: seq=%ld stat_com:",
                                       ZR_DEVNAME(zr), zr->jpg_seq_num);
                                for (i = 0; i < 4; i++) {
                                        printk(KERN_CONT " %08x",
                                               le32_to_cpu(zr->stat_com[i]));
                                }
                                printk(KERN_CONT "\n");
                        }
                        zr->frame_num++;
                        zr->JPEG_missed = 0;
                        zr->JPEG_error = 0;
                        zoran_reap_stat_com(zr);
                        zoran_feed_stat_com(zr);
                        wake_up_interruptible(&zr->jpg_capq);
                }
#endif                          /* (IRQ_MASK & ZR36057_ISR_JPEGRepIRQ) */

                /* DATERR, too many fields missed, error processing */
                if ((astat & zr->card.jpeg_int) ||
                    zr->JPEG_missed > 25 ||
                    zr->JPEG_error == 1 ||
                    ((zr->codec_mode == BUZ_MODE_MOTION_DECOMPRESS) &&
                     (zr->frame_num && (zr->JPEG_missed > zr->jpg_settings.field_per_buff)))) {
                        error_handler(zr, astat, stat);
                }

                count++;
                if (count > 10) {
                        dprintk(2, KERN_WARNING "%s: irq loop %d\n",
                                ZR_DEVNAME(zr), count);
                        if (count > 20) {
                                btand(~ZR36057_ICR_IntPinEn, ZR36057_ICR);
                                dprintk(2,
                                        KERN_ERR
                                        "%s: IRQ lockup, cleared int mask\n",
                                        ZR_DEVNAME(zr));
                                break;
                        }
                }
                zr->last_isr = stat;
        }
        spin_unlock_irqrestore(&zr->spinlock, flags);

        return IRQ_HANDLED;
}

void
zoran_set_pci_master (struct zoran *zr,
                      int           set_master)
{
        if (set_master) {
                pci_set_master(zr->pci_dev);
        } else {
                u16 command;

                pci_read_config_word(zr->pci_dev, PCI_COMMAND, &command);
                command &= ~PCI_COMMAND_MASTER;
                pci_write_config_word(zr->pci_dev, PCI_COMMAND, command);
        }
}

void
zoran_init_hardware (struct zoran *zr)
{
        /* Enable bus-mastering */
        zoran_set_pci_master(zr, 1);

        /* Initialize the board */
        if (zr->card.init) {
                zr->card.init(zr);
        }

        decoder_call(zr, core, init, 0);
        decoder_call(zr, core, s_std, zr->norm);
        decoder_call(zr, video, s_routing,
                zr->card.input[zr->input].muxsel, 0, 0);

        encoder_call(zr, core, init, 0);
        encoder_call(zr, video, s_std_output, zr->norm);
        encoder_call(zr, video, s_routing, 0, 0, 0);

        /* toggle JPEG codec sleep to sync PLL */
        jpeg_codec_sleep(zr, 1);
        jpeg_codec_sleep(zr, 0);

        /* set individual interrupt enables (without GIRQ1)
         * but don't global enable until zoran_open() */

        //btwrite(IRQ_MASK & ~ZR36057_ISR_GIRQ1, ZR36057_ICR);  // SW
        // It looks like using only JPEGRepIRQEn is not always reliable,
        // may be when JPEG codec crashes it won't generate IRQ? So,
         /*CP*/                 //        btwrite(IRQ_MASK, ZR36057_ICR); // Enable Vsync interrupts too. SM    WHY ? LP
            zr36057_init_vfe(zr);

        zr36057_enable_jpg(zr, BUZ_MODE_IDLE);

        btwrite(IRQ_MASK, ZR36057_ISR); // Clears interrupts
}

void
zr36057_restart (struct zoran *zr)
{
        btwrite(0, ZR36057_SPGPPCR);
        mdelay(1);
        btor(ZR36057_SPGPPCR_SoftReset, ZR36057_SPGPPCR);
        mdelay(1);

        /* assert P_Reset */
        btwrite(0, ZR36057_JPC);
        /* set up GPIO direction - all output */
        btwrite(ZR36057_SPGPPCR_SoftReset | 0, ZR36057_SPGPPCR);

        /* set up GPIO pins and guest bus timing */
        btwrite((0x81 << 24) | 0x8888, ZR36057_GPPGCR1);
}

/*
 * initialize video front end
 */

static void
zr36057_init_vfe (struct zoran *zr)
{
        u32 reg;

        reg = btread(ZR36057_VFESPFR);
        reg |= ZR36057_VFESPFR_LittleEndian;
        reg &= ~ZR36057_VFESPFR_VCLKPol;
        reg |= ZR36057_VFESPFR_ExtFl;
        reg |= ZR36057_VFESPFR_TopField;
        btwrite(reg, ZR36057_VFESPFR);
        reg = btread(ZR36057_VDCR);
        if (pci_pci_problems & PCIPCI_TRITON)
                // || zr->revision < 1) // Revision 1 has also Triton support
                reg &= ~ZR36057_VDCR_Triton;
        else
                reg |= ZR36057_VDCR_Triton;
        btwrite(reg, ZR36057_VDCR);
}