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zoran_device.c

/*
 * 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/byteorder/generic.h>

#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>
#include <linux/videodev.h>
#include <linux/spinlock.h>
#include <linux/sem.h>

#include <linux/pci.h>
#include <linux/video_decoder.h>
#include <linux/video_encoder.h>
#include <linux/delay.h>
#include <linux/wait.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 )

extern const struct zoran_format zoran_formats[];

static int lml33dpath = 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[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[GPIO_JPEG_RESET], 0);
            udelay(2);
            GPIO(zr, zr->card.gpio[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 == VIDEO_MODE_NTSC ||
                (zr->card.type == LML33R10 &&
                 zr->norm == VIDEO_MODE_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 (zr->norm != VIDEO_MODE_PAL &&
          zr->norm != VIDEO_MODE_NTSC &&
          zr->norm != VIDEO_MODE_SECAM) {
            dprintk(1,
                  KERN_ERR "%s: set_vfe() - norm = %d not valid\n",
                  ZR_DEVNAME(zr), zr->norm);
            return;
      }
      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 = (VidWinWid * 64 + tvn->Wa - 1) / 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 = (VidWinHt * 64 * 2 + tvn->Ha - 1) / 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 != VIDEO_MODE_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 allready checked before the call to this routine.
             * All error messages are internal driver checking only! */

            /* video display top and bottom registers */
            reg = (long) zr->buffer.base +
                zr->overlay_settings.x *
                ((zr->overlay_settings.format->depth + 7) / 8) +
                zr->overlay_settings.y *
                zr->buffer.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->buffer.bytesperline;
            btwrite(reg, ZR36057_VDBR);

            /* video stride, status, and frame grab register */
            reg = zr->buffer.bytesperline -
                zr->overlay_settings.width *
                ((zr->overlay_settings.format->depth + 7) / 8);
            if (zr->overlay_settings.height > BUZ_MAX_HEIGHT / 2)
                  reg += zr->buffer.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 file       *file,
                struct video_clip *vp,
                int                count)
{
      struct zoran_fh *fh = file->private_data;
      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].x;
            y = vp[i].y;
            width = vp[i].width;
            height = vp[i].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[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[GPIO_VID_DIR],
                 zr->card.gpio_pol[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;
}

/* hack */
extern void zr36016_write (struct videocodec *codec,
                     u16                reg,
                     u32                val);

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)
{
      static int zero = 0;
      static int one = 1;
      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_command(zr, DECODER_ENABLE_OUTPUT, &one);
            encoder_command(zr, ENCODER_SET_INPUT, &zero);

            /* 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_command(zr, DECODER_ENABLE_OUTPUT, &zero);
            set_videobus_dir(zr, 1);
            encoder_command(zr, ENCODER_SET_INPUT, &one);

            /* 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_command(zr, DECODER_ENABLE_OUTPUT, &one);
            encoder_command(zr, ENCODER_SET_INPUT, &zero);

            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].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].frag_tab_bus);
                  zr->stat_com[i + 1] =
                      cpu_to_le32(zr->jpg_buffers.buffer[frame].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_jpg_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
error_handler (struct zoran *zr,
             u32           astat,
             u32           stat)
{
      /* This is JPEG error handling part */
      if ((zr->codec_mode != BUZ_MODE_MOTION_COMPRESS) &&
          (zr->codec_mode != BUZ_MODE_MOTION_DECOMPRESS)) {
            //dprintk(1, KERN_ERR "%s: Internal error: error handling request in mode %d\n", ZR_DEVNAME(zr), zr->codec_mode);
            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) {
            /*
             * 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;
                  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("stat_com frames:");
                  {
                        int i, j;
                        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].
                                        frag_tab_bus) {
                                          printk("% d->%d",
                                                 j, i);
                                    }
                              }
                        }
                        printk("\n");
                  }
            }
            /* Find an entry in stat_com and rotate contents */
            {
                  int i;

                  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;
                        u32 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; */
            }
      }

      /* Now the stat_comm buffer is ready for restart */
      do {
            int status, mode;

            if (zr->codec_mode == BUZ_MODE_MOTION_COMPRESS) {
                  decoder_command(zr, DECODER_GET_STATUS, &status);
                  mode = CODEC_DO_COMPRESSION;
            } else {
                  status = 0;
                  mode = CODEC_DO_EXPANSION;
            }
            if (zr->codec_mode == BUZ_MODE_MOTION_DECOMPRESS ||
                (status & DECODER_STATUS_GOOD)) {
                  /********** 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 ***********/
            }
      } while (0);
}

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].
                                  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) {

                  if (zr->codec_mode == BUZ_MODE_MOTION_DECOMPRESS ||
                      zr->codec_mode == BUZ_MODE_MOTION_COMPRESS) {
                        if (zr36067_debug > 1 &&
                            (!zr->frame_num || zr->JPEG_error)) {
                              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);
                              {
                                    char sc[] = "0000";
                                    char sv[5];
                                    int i;
                                    strcpy(sv, sc);
                                    for (i = 0; i < 4; i++) {
                                          if (le32_to_cpu(zr->stat_com[i]) & 1)
                                                sv[i] = '1';
                                    }
                                    sv[4] = 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 {
                              if (zr->JPEG_missed > zr->JPEG_max_missed)      // Get statistics
                                    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("%s: seq=%ld stat_com:",
                                     ZR_DEVNAME(zr), zr->jpg_seq_num);
                              for (i = 0; i < 4; i++) {
                                    printk(" %08x",
                                           le32_to_cpu(zr->stat_com[i]));
                              }
                              printk("\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);
                  } /*else {
                        dprintk(1,
                              KERN_ERR
                              "%s: JPEG interrupt while not in motion (de)compress mode!\n",
                              ZR_DEVNAME(zr));
                  }*/
            }
#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)
{
      int j, zero = 0;

      /* Enable bus-mastering */
      zoran_set_pci_master(zr, 1);

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

      j = zr->card.input[zr->input].muxsel;

      decoder_command(zr, 0, NULL);
      decoder_command(zr, DECODER_SET_NORM, &zr->norm);
      decoder_command(zr, DECODER_SET_INPUT, &j);

      encoder_command(zr, 0, NULL);
      encoder_command(zr, ENCODER_SET_NORM, &zr->norm);
      encoder_command(zr, ENCODER_SET_INPUT, &zero);

      /* 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);
}

/*
 * Interface to decoder and encoder chips using i2c bus
 */

int
decoder_command (struct zoran *zr,
             int           cmd,
             void         *data)
{
      if (zr->decoder == NULL)
            return -EIO;

      if (zr->card.type == LML33 &&
          (cmd == DECODER_SET_NORM || DECODER_SET_INPUT)) {
            int res;

            // Bt819 needs to reset its FIFO buffer using #FRST pin and
            // LML33 card uses GPIO(7) for that.
            GPIO(zr, 7, 0);
            res = zr->decoder->driver->command(zr->decoder, cmd, data);
            // Pull #FRST high.
            GPIO(zr, 7, 1);
            return res;
      } else
            return zr->decoder->driver->command(zr->decoder, cmd,
                                        data);
}

int
encoder_command (struct zoran *zr,
             int           cmd,
             void         *data)
{
      if (zr->encoder == NULL)
            return -1;

      return zr->encoder->driver->command(zr->encoder, cmd, data);
}

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