V4L/DVB (3539): Move bttv fragments to bt8xx/

Signed-off-by: Manu Abraham <manu@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 795 insertions, 0 deletions

diff --git a/drivers/media/video/bt8xx/bttv-risc.c b/drivers/media/video/bt8xx/bttv-risc.c
new file mode 100644
index 00000000000..16323a5d68a
--- /dev/null
+++ b/drivers/media/video/bt8xx/bttv-risc.c
@@ -0,0 +1,795 @@
+/*
+
+    bttv-risc.c  --  interfaces to other kernel modules
+
+    bttv risc code handling
+	- memory management
+	- generation
+
+    (c) 2000-2003 Gerd Knorr <kraxel@bytesex.org>
+
+    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/module.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/vmalloc.h>
+#include <linux/interrupt.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+
+#include "bttvp.h"
+
+#define VCR_HACK_LINES 4
+
+/* ---------------------------------------------------------- */
+/* risc code generators                                       */
+
+int
+bttv_risc_packed(struct bttv *btv, struct btcx_riscmem *risc,
+		 struct scatterlist *sglist,
+		 unsigned int offset, unsigned int bpl,
+		 unsigned int padding, unsigned int lines)
+{
+	u32 instructions,line,todo;
+	struct scatterlist *sg;
+	u32 *rp;
+	int rc;
+
+	/* estimate risc mem: worst case is one write per page border +
+	   one write per scan line + sync + jump (all 2 dwords).  padding
+	   can cause next bpl to start close to a page border.  First DMA
+	   region may be smaller than PAGE_SIZE */
+	instructions  = 1 + ((bpl + padding) * lines) / PAGE_SIZE + lines;
+	instructions += 2;
+	if ((rc = btcx_riscmem_alloc(btv->c.pci,risc,instructions*8)) < 0)
+		return rc;
+
+	/* sync instruction */
+	rp = risc->cpu;
+	*(rp++) = cpu_to_le32(BT848_RISC_SYNC|BT848_FIFO_STATUS_FM1);
+	*(rp++) = cpu_to_le32(0);
+
+	/* scan lines */
+	sg = sglist;
+	for (line = 0; line < lines; line++) {
+		if ((btv->opt_vcr_hack) &&
+		    (line >= (lines - VCR_HACK_LINES)))
+			continue;
+		while (offset && offset >= sg_dma_len(sg)) {
+			offset -= sg_dma_len(sg);
+			sg++;
+		}
+		if (bpl <= sg_dma_len(sg)-offset) {
+			/* fits into current chunk */
+			*(rp++)=cpu_to_le32(BT848_RISC_WRITE|BT848_RISC_SOL|
+					    BT848_RISC_EOL|bpl);
+			*(rp++)=cpu_to_le32(sg_dma_address(sg)+offset);
+			offset+=bpl;
+		} else {
+			/* scanline needs to be splitted */
+			todo = bpl;
+			*(rp++)=cpu_to_le32(BT848_RISC_WRITE|BT848_RISC_SOL|
+					    (sg_dma_len(sg)-offset));
+			*(rp++)=cpu_to_le32(sg_dma_address(sg)+offset);
+			todo -= (sg_dma_len(sg)-offset);
+			offset = 0;
+			sg++;
+			while (todo > sg_dma_len(sg)) {
+				*(rp++)=cpu_to_le32(BT848_RISC_WRITE|
+						    sg_dma_len(sg));
+				*(rp++)=cpu_to_le32(sg_dma_address(sg));
+				todo -= sg_dma_len(sg);
+				sg++;
+			}
+			*(rp++)=cpu_to_le32(BT848_RISC_WRITE|BT848_RISC_EOL|
+					    todo);
+			*(rp++)=cpu_to_le32(sg_dma_address(sg));
+			offset += todo;
+		}
+		offset += padding;
+	}
+
+	/* save pointer to jmp instruction address */
+	risc->jmp = rp;
+	BUG_ON((risc->jmp - risc->cpu + 2) * sizeof(*risc->cpu) > risc->size);
+	return 0;
+}
+
+static int
+bttv_risc_planar(struct bttv *btv, struct btcx_riscmem *risc,
+		 struct scatterlist *sglist,
+		 unsigned int yoffset,  unsigned int ybpl,
+		 unsigned int ypadding, unsigned int ylines,
+		 unsigned int uoffset,  unsigned int voffset,
+		 unsigned int hshift,   unsigned int vshift,
+		 unsigned int cpadding)
+{
+	unsigned int instructions,line,todo,ylen,chroma;
+	u32 *rp,ri;
+	struct scatterlist *ysg;
+	struct scatterlist *usg;
+	struct scatterlist *vsg;
+	int topfield = (0 == yoffset);
+	int rc;
+
+	/* estimate risc mem: worst case is one write per page border +
+	   one write per scan line (5 dwords)
+	   plus sync + jump (2 dwords) */
+	instructions  = (ybpl * ylines * 2) / PAGE_SIZE + ylines;
+	instructions += 2;
+	if ((rc = btcx_riscmem_alloc(btv->c.pci,risc,instructions*4*5)) < 0)
+		return rc;
+
+	/* sync instruction */
+	rp = risc->cpu;
+	*(rp++) = cpu_to_le32(BT848_RISC_SYNC|BT848_FIFO_STATUS_FM3);
+	*(rp++) = cpu_to_le32(0);
+
+	/* scan lines */
+	ysg = sglist;
+	usg = sglist;
+	vsg = sglist;
+	for (line = 0; line < ylines; line++) {
+		if ((btv->opt_vcr_hack) &&
+		    (line >= (ylines - VCR_HACK_LINES)))
+			continue;
+		switch (vshift) {
+		case 0:
+			chroma = 1;
+			break;
+		case 1:
+			if (topfield)
+				chroma = ((line & 1) == 0);
+			else
+				chroma = ((line & 1) == 1);
+			break;
+		case 2:
+			if (topfield)
+				chroma = ((line & 3) == 0);
+			else
+				chroma = ((line & 3) == 2);
+			break;
+		default:
+			chroma = 0;
+			break;
+		}
+
+		for (todo = ybpl; todo > 0; todo -= ylen) {
+			/* go to next sg entry if needed */
+			while (yoffset && yoffset >= sg_dma_len(ysg)) {
+				yoffset -= sg_dma_len(ysg);
+				ysg++;
+			}
+			while (uoffset && uoffset >= sg_dma_len(usg)) {
+				uoffset -= sg_dma_len(usg);
+				usg++;
+			}
+			while (voffset && voffset >= sg_dma_len(vsg)) {
+				voffset -= sg_dma_len(vsg);
+				vsg++;
+			}
+
+			/* calculate max number of bytes we can write */
+			ylen = todo;
+			if (yoffset + ylen > sg_dma_len(ysg))
+				ylen = sg_dma_len(ysg) - yoffset;
+			if (chroma) {
+				if (uoffset + (ylen>>hshift) > sg_dma_len(usg))
+					ylen = (sg_dma_len(usg) - uoffset) << hshift;
+				if (voffset + (ylen>>hshift) > sg_dma_len(vsg))
+					ylen = (sg_dma_len(vsg) - voffset) << hshift;
+				ri = BT848_RISC_WRITE123;
+			} else {
+				ri = BT848_RISC_WRITE1S23;
+			}
+			if (ybpl == todo)
+				ri |= BT848_RISC_SOL;
+			if (ylen == todo)
+				ri |= BT848_RISC_EOL;
+
+			/* write risc instruction */
+			*(rp++)=cpu_to_le32(ri | ylen);
+			*(rp++)=cpu_to_le32(((ylen >> hshift) << 16) |
+					    (ylen >> hshift));
+			*(rp++)=cpu_to_le32(sg_dma_address(ysg)+yoffset);
+			yoffset += ylen;
+			if (chroma) {
+				*(rp++)=cpu_to_le32(sg_dma_address(usg)+uoffset);
+				uoffset += ylen >> hshift;
+				*(rp++)=cpu_to_le32(sg_dma_address(vsg)+voffset);
+				voffset += ylen >> hshift;
+			}
+		}
+		yoffset += ypadding;
+		if (chroma) {
+			uoffset += cpadding;
+			voffset += cpadding;
+		}
+	}
+
+	/* save pointer to jmp instruction address */
+	risc->jmp = rp;
+	BUG_ON((risc->jmp - risc->cpu + 2) * sizeof(*risc->cpu) > risc->size);
+	return 0;
+}
+
+static int
+bttv_risc_overlay(struct bttv *btv, struct btcx_riscmem *risc,
+		  const struct bttv_format *fmt, struct bttv_overlay *ov,
+		  int skip_even, int skip_odd)
+{
+	int instructions,rc,line,maxy,start,end,skip,nskips;
+	struct btcx_skiplist *skips;
+	u32 *rp,ri,ra;
+	u32 addr;
+
+	/* skip list for window clipping */
+	if (NULL == (skips = kmalloc(sizeof(*skips) * ov->nclips,GFP_KERNEL)))
+		return -ENOMEM;
+
+	/* estimate risc mem: worst case is (clip+1) * lines instructions
+	   + sync + jump (all 2 dwords) */
+	instructions  = (ov->nclips + 1) *
+		((skip_even || skip_odd) ? ov->w.height>>1 :  ov->w.height);
+	instructions += 2;
+	if ((rc = btcx_riscmem_alloc(btv->c.pci,risc,instructions*8)) < 0) {
+		kfree(skips);
+		return rc;
+	}
+
+	/* sync instruction */
+	rp = risc->cpu;
+	*(rp++) = cpu_to_le32(BT848_RISC_SYNC|BT848_FIFO_STATUS_FM1);
+	*(rp++) = cpu_to_le32(0);
+
+	addr  = (unsigned long)btv->fbuf.base;
+	addr += btv->fbuf.fmt.bytesperline * ov->w.top;
+	addr += (fmt->depth >> 3)          * ov->w.left;
+
+	/* scan lines */
+	for (maxy = -1, line = 0; line < ov->w.height;
+	     line++, addr += btv->fbuf.fmt.bytesperline) {
+		if ((btv->opt_vcr_hack) &&
+		     (line >= (ov->w.height - VCR_HACK_LINES)))
+			continue;
+		if ((line%2) == 0  &&  skip_even)
+			continue;
+		if ((line%2) == 1  &&  skip_odd)
+			continue;
+
+		/* calculate clipping */
+		if (line > maxy)
+			btcx_calc_skips(line, ov->w.width, &maxy,
+					skips, &nskips, ov->clips, ov->nclips);
+		else
+			nskips = 0;
+
+		/* write out risc code */
+		for (start = 0, skip = 0; start < ov->w.width; start = end) {
+			if (skip >= nskips) {
+				ri  = BT848_RISC_WRITE;
+				end = ov->w.width;
+			} else if (start < skips[skip].start) {
+				ri  = BT848_RISC_WRITE;
+				end = skips[skip].start;
+			} else {
+				ri  = BT848_RISC_SKIP;
+				end = skips[skip].end;
+				skip++;
+			}
+			if (BT848_RISC_WRITE == ri)
+				ra = addr + (fmt->depth>>3)*start;
+			else
+				ra = 0;
+
+			if (0 == start)
+				ri |= BT848_RISC_SOL;
+			if (ov->w.width == end)
+				ri |= BT848_RISC_EOL;
+			ri |= (fmt->depth>>3) * (end-start);
+
+			*(rp++)=cpu_to_le32(ri);
+			if (0 != ra)
+				*(rp++)=cpu_to_le32(ra);
+		}
+	}
+
+	/* save pointer to jmp instruction address */
+	risc->jmp = rp;
+	BUG_ON((risc->jmp - risc->cpu + 2) * sizeof(*risc->cpu) > risc->size);
+	kfree(skips);
+	return 0;
+}
+
+/* ---------------------------------------------------------- */
+
+static void
+bttv_calc_geo(struct bttv *btv, struct bttv_geometry *geo,
+	      int width, int height, int interleaved, int norm)
+{
+	const struct bttv_tvnorm *tvnorm = &bttv_tvnorms[norm];
+	u32 xsf, sr;
+	int vdelay;
+
+	int swidth       = tvnorm->swidth;
+	int totalwidth   = tvnorm->totalwidth;
+	int scaledtwidth = tvnorm->scaledtwidth;
+
+	if (bttv_tvcards[btv->c.type].muxsel[btv->input] < 0) {
+		swidth       = 720;
+		totalwidth   = 858;
+		scaledtwidth = 858;
+	}
+
+	vdelay = tvnorm->vdelay;
+
+	xsf = (width*scaledtwidth)/swidth;
+	geo->hscale =  ((totalwidth*4096UL)/xsf-4096);
+	geo->hdelay =  tvnorm->hdelayx1;
+	geo->hdelay =  (geo->hdelay*width)/swidth;
+	geo->hdelay &= 0x3fe;
+	sr = ((tvnorm->sheight >> (interleaved?0:1))*512)/height - 512;
+	geo->vscale =  (0x10000UL-sr) & 0x1fff;
+	geo->crop   =  ((width>>8)&0x03) | ((geo->hdelay>>6)&0x0c) |
+		((tvnorm->sheight>>4)&0x30) | ((vdelay>>2)&0xc0);
+	geo->vscale |= interleaved ? (BT848_VSCALE_INT<<8) : 0;
+	geo->vdelay  =  vdelay;
+	geo->width   =  width;
+	geo->sheight =  tvnorm->sheight;
+	geo->vtotal  =  tvnorm->vtotal;
+
+	if (btv->opt_combfilter) {
+		geo->vtc  = (width < 193) ? 2 : ((width < 385) ? 1 : 0);
+		geo->comb = (width < 769) ? 1 : 0;
+	} else {
+		geo->vtc  = 0;
+		geo->comb = 0;
+	}
+}
+
+static void
+bttv_apply_geo(struct bttv *btv, struct bttv_geometry *geo, int odd)
+{
+	int off = odd ? 0x80 : 0x00;
+
+	if (geo->comb)
+		btor(BT848_VSCALE_COMB, BT848_E_VSCALE_HI+off);
+	else
+		btand(~BT848_VSCALE_COMB, BT848_E_VSCALE_HI+off);
+
+	btwrite(geo->vtc,             BT848_E_VTC+off);
+	btwrite(geo->hscale >> 8,     BT848_E_HSCALE_HI+off);
+	btwrite(geo->hscale & 0xff,   BT848_E_HSCALE_LO+off);
+	btaor((geo->vscale>>8), 0xe0, BT848_E_VSCALE_HI+off);
+	btwrite(geo->vscale & 0xff,   BT848_E_VSCALE_LO+off);
+	btwrite(geo->width & 0xff,    BT848_E_HACTIVE_LO+off);
+	btwrite(geo->hdelay & 0xff,   BT848_E_HDELAY_LO+off);
+	btwrite(geo->sheight & 0xff,  BT848_E_VACTIVE_LO+off);
+	btwrite(geo->vdelay & 0xff,   BT848_E_VDELAY_LO+off);
+	btwrite(geo->crop,            BT848_E_CROP+off);
+	btwrite(geo->vtotal>>8,       BT848_VTOTAL_HI);
+	btwrite(geo->vtotal & 0xff,   BT848_VTOTAL_LO);
+}
+
+/* ---------------------------------------------------------- */
+/* risc group / risc main loop / dma management               */
+
+void
+bttv_set_dma(struct bttv *btv, int override)
+{
+	unsigned long cmd;
+	int capctl;
+
+	btv->cap_ctl = 0;
+	if (NULL != btv->curr.top)      btv->cap_ctl |= 0x02;
+	if (NULL != btv->curr.bottom)   btv->cap_ctl |= 0x01;
+	if (NULL != btv->cvbi)          btv->cap_ctl |= 0x0c;
+
+	capctl  = 0;
+	capctl |= (btv->cap_ctl & 0x03) ? 0x03 : 0x00;  /* capture  */
+	capctl |= (btv->cap_ctl & 0x0c) ? 0x0c : 0x00;  /* vbi data */
+	capctl |= override;
+
+	d2printk(KERN_DEBUG
+		 "bttv%d: capctl=%x lirq=%d top=%08Lx/%08Lx even=%08Lx/%08Lx\n",
+		 btv->c.nr,capctl,btv->loop_irq,
+		 btv->cvbi         ? (unsigned long long)btv->cvbi->top.dma            : 0,
+		 btv->curr.top     ? (unsigned long long)btv->curr.top->top.dma        : 0,
+		 btv->cvbi         ? (unsigned long long)btv->cvbi->bottom.dma         : 0,
+		 btv->curr.bottom  ? (unsigned long long)btv->curr.bottom->bottom.dma  : 0);
+
+	cmd = BT848_RISC_JUMP;
+	if (btv->loop_irq) {
+		cmd |= BT848_RISC_IRQ;
+		cmd |= (btv->loop_irq  & 0x0f) << 16;
+		cmd |= (~btv->loop_irq & 0x0f) << 20;
+	}
+	if (btv->curr.frame_irq || btv->loop_irq || btv->cvbi) {
+		mod_timer(&btv->timeout, jiffies+BTTV_TIMEOUT);
+	} else {
+		del_timer(&btv->timeout);
+	}
+	btv->main.cpu[RISC_SLOT_LOOP] = cpu_to_le32(cmd);
+
+	btaor(capctl, ~0x0f, BT848_CAP_CTL);
+	if (capctl) {
+		if (btv->dma_on)
+			return;
+		btwrite(btv->main.dma, BT848_RISC_STRT_ADD);
+		btor(3, BT848_GPIO_DMA_CTL);
+		btv->dma_on = 1;
+	} else {
+		if (!btv->dma_on)
+			return;
+		btand(~3, BT848_GPIO_DMA_CTL);
+		btv->dma_on = 0;
+	}
+	return;
+}
+
+int
+bttv_risc_init_main(struct bttv *btv)
+{
+	int rc;
+
+	if ((rc = btcx_riscmem_alloc(btv->c.pci,&btv->main,PAGE_SIZE)) < 0)
+		return rc;
+	dprintk(KERN_DEBUG "bttv%d: risc main @ %08Lx\n",
+		btv->c.nr,(unsigned long long)btv->main.dma);
+
+	btv->main.cpu[0] = cpu_to_le32(BT848_RISC_SYNC | BT848_RISC_RESYNC |
+				       BT848_FIFO_STATUS_VRE);
+	btv->main.cpu[1] = cpu_to_le32(0);
+	btv->main.cpu[2] = cpu_to_le32(BT848_RISC_JUMP);
+	btv->main.cpu[3] = cpu_to_le32(btv->main.dma + (4<<2));
+
+	/* top field */
+	btv->main.cpu[4] = cpu_to_le32(BT848_RISC_JUMP);
+	btv->main.cpu[5] = cpu_to_le32(btv->main.dma + (6<<2));
+	btv->main.cpu[6] = cpu_to_le32(BT848_RISC_JUMP);
+	btv->main.cpu[7] = cpu_to_le32(btv->main.dma + (8<<2));
+
+	btv->main.cpu[8] = cpu_to_le32(BT848_RISC_SYNC | BT848_RISC_RESYNC |
+				       BT848_FIFO_STATUS_VRO);
+	btv->main.cpu[9] = cpu_to_le32(0);
+
+	/* bottom field */
+	btv->main.cpu[10] = cpu_to_le32(BT848_RISC_JUMP);
+	btv->main.cpu[11] = cpu_to_le32(btv->main.dma + (12<<2));
+	btv->main.cpu[12] = cpu_to_le32(BT848_RISC_JUMP);
+	btv->main.cpu[13] = cpu_to_le32(btv->main.dma + (14<<2));
+
+	/* jump back to top field */
+	btv->main.cpu[14] = cpu_to_le32(BT848_RISC_JUMP);
+	btv->main.cpu[15] = cpu_to_le32(btv->main.dma + (0<<2));
+
+	return 0;
+}
+
+int
+bttv_risc_hook(struct bttv *btv, int slot, struct btcx_riscmem *risc,
+	       int irqflags)
+{
+	unsigned long cmd;
+	unsigned long next = btv->main.dma + ((slot+2) << 2);
+
+	if (NULL == risc) {
+		d2printk(KERN_DEBUG "bttv%d: risc=%p slot[%d]=NULL\n",
+			 btv->c.nr,risc,slot);
+		btv->main.cpu[slot+1] = cpu_to_le32(next);
+	} else {
+		d2printk(KERN_DEBUG "bttv%d: risc=%p slot[%d]=%08Lx irq=%d\n",
+			 btv->c.nr,risc,slot,(unsigned long long)risc->dma,irqflags);
+		cmd = BT848_RISC_JUMP;
+		if (irqflags) {
+			cmd |= BT848_RISC_IRQ;
+			cmd |= (irqflags  & 0x0f) << 16;
+			cmd |= (~irqflags & 0x0f) << 20;
+		}
+		risc->jmp[0] = cpu_to_le32(cmd);
+		risc->jmp[1] = cpu_to_le32(next);
+		btv->main.cpu[slot+1] = cpu_to_le32(risc->dma);
+	}
+	return 0;
+}
+
+void
+bttv_dma_free(struct videobuf_queue *q,struct bttv *btv, struct bttv_buffer *buf)
+{
+	BUG_ON(in_interrupt());
+	videobuf_waiton(&buf->vb,0,0);
+	videobuf_dma_unmap(q, &buf->vb.dma);
+	videobuf_dma_free(&buf->vb.dma);
+	btcx_riscmem_free(btv->c.pci,&buf->bottom);
+	btcx_riscmem_free(btv->c.pci,&buf->top);
+	buf->vb.state = STATE_NEEDS_INIT;
+}
+
+int
+bttv_buffer_activate_vbi(struct bttv *btv,
+			 struct bttv_buffer *vbi)
+{
+	/* vbi capture */
+	if (vbi) {
+		vbi->vb.state = STATE_ACTIVE;
+		list_del(&vbi->vb.queue);
+		bttv_risc_hook(btv, RISC_SLOT_O_VBI, &vbi->top,    0);
+		bttv_risc_hook(btv, RISC_SLOT_E_VBI, &vbi->bottom, 4);
+	} else {
+		bttv_risc_hook(btv, RISC_SLOT_O_VBI, NULL, 0);
+		bttv_risc_hook(btv, RISC_SLOT_E_VBI, NULL, 0);
+	}
+	return 0;
+}
+
+int
+bttv_buffer_activate_video(struct bttv *btv,
+			   struct bttv_buffer_set *set)
+{
+	/* video capture */
+	if (NULL != set->top  &&  NULL != set->bottom) {
+		if (set->top == set->bottom) {
+			set->top->vb.state    = STATE_ACTIVE;
+			if (set->top->vb.queue.next)
+				list_del(&set->top->vb.queue);
+		} else {
+			set->top->vb.state    = STATE_ACTIVE;
+			set->bottom->vb.state = STATE_ACTIVE;
+			if (set->top->vb.queue.next)
+				list_del(&set->top->vb.queue);
+			if (set->bottom->vb.queue.next)
+				list_del(&set->bottom->vb.queue);
+		}
+		bttv_apply_geo(btv, &set->top->geo, 1);
+		bttv_apply_geo(btv, &set->bottom->geo,0);
+		bttv_risc_hook(btv, RISC_SLOT_O_FIELD, &set->top->top,
+			       set->top_irq);
+		bttv_risc_hook(btv, RISC_SLOT_E_FIELD, &set->bottom->bottom,
+			       set->frame_irq);
+		btaor((set->top->btformat & 0xf0) | (set->bottom->btformat & 0x0f),
+		      ~0xff, BT848_COLOR_FMT);
+		btaor((set->top->btswap & 0x0a) | (set->bottom->btswap & 0x05),
+		      ~0x0f, BT848_COLOR_CTL);
+	} else if (NULL != set->top) {
+		set->top->vb.state  = STATE_ACTIVE;
+		if (set->top->vb.queue.next)
+			list_del(&set->top->vb.queue);
+		bttv_apply_geo(btv, &set->top->geo,1);
+		bttv_apply_geo(btv, &set->top->geo,0);
+		bttv_risc_hook(btv, RISC_SLOT_O_FIELD, &set->top->top,
+			       set->frame_irq);
+		bttv_risc_hook(btv, RISC_SLOT_E_FIELD, NULL,           0);
+		btaor(set->top->btformat & 0xff, ~0xff, BT848_COLOR_FMT);
+		btaor(set->top->btswap & 0x0f,   ~0x0f, BT848_COLOR_CTL);
+	} else if (NULL != set->bottom) {
+		set->bottom->vb.state = STATE_ACTIVE;
+		if (set->bottom->vb.queue.next)
+			list_del(&set->bottom->vb.queue);
+		bttv_apply_geo(btv, &set->bottom->geo,1);
+		bttv_apply_geo(btv, &set->bottom->geo,0);
+		bttv_risc_hook(btv, RISC_SLOT_O_FIELD, NULL, 0);
+		bttv_risc_hook(btv, RISC_SLOT_E_FIELD, &set->bottom->bottom,
+			       set->frame_irq);
+		btaor(set->bottom->btformat & 0xff, ~0xff, BT848_COLOR_FMT);
+		btaor(set->bottom->btswap & 0x0f,   ~0x0f, BT848_COLOR_CTL);
+	} else {
+		bttv_risc_hook(btv, RISC_SLOT_O_FIELD, NULL, 0);
+		bttv_risc_hook(btv, RISC_SLOT_E_FIELD, NULL, 0);
+	}
+	return 0;
+}
+
+/* ---------------------------------------------------------- */
+
+/* calculate geometry, build risc code */
+int
+bttv_buffer_risc(struct bttv *btv, struct bttv_buffer *buf)
+{
+	const struct bttv_tvnorm *tvnorm = bttv_tvnorms + buf->tvnorm;
+
+	dprintk(KERN_DEBUG
+		"bttv%d: buffer field: %s  format: %s  size: %dx%d\n",
+		btv->c.nr, v4l2_field_names[buf->vb.field],
+		buf->fmt->name, buf->vb.width, buf->vb.height);
+
+	/* packed pixel modes */
+	if (buf->fmt->flags & FORMAT_FLAGS_PACKED) {
+		int bpl = (buf->fmt->depth >> 3) * buf->vb.width;
+		int bpf = bpl * (buf->vb.height >> 1);
+
+		bttv_calc_geo(btv,&buf->geo,buf->vb.width,buf->vb.height,
+			      V4L2_FIELD_HAS_BOTH(buf->vb.field),buf->tvnorm);
+
+		switch (buf->vb.field) {
+		case V4L2_FIELD_TOP:
+			bttv_risc_packed(btv,&buf->top,buf->vb.dma.sglist,
+					 0,bpl,0,buf->vb.height);
+			break;
+		case V4L2_FIELD_BOTTOM:
+			bttv_risc_packed(btv,&buf->bottom,buf->vb.dma.sglist,
+					 0,bpl,0,buf->vb.height);
+			break;
+		case V4L2_FIELD_INTERLACED:
+			bttv_risc_packed(btv,&buf->top,buf->vb.dma.sglist,
+					 0,bpl,bpl,buf->vb.height >> 1);
+			bttv_risc_packed(btv,&buf->bottom,buf->vb.dma.sglist,
+					 bpl,bpl,bpl,buf->vb.height >> 1);
+			break;
+		case V4L2_FIELD_SEQ_TB:
+			bttv_risc_packed(btv,&buf->top,buf->vb.dma.sglist,
+					 0,bpl,0,buf->vb.height >> 1);
+			bttv_risc_packed(btv,&buf->bottom,buf->vb.dma.sglist,
+					 bpf,bpl,0,buf->vb.height >> 1);
+			break;
+		default:
+			BUG();
+		}
+	}
+
+	/* planar modes */
+	if (buf->fmt->flags & FORMAT_FLAGS_PLANAR) {
+		int uoffset, voffset;
+		int ypadding, cpadding, lines;
+
+		/* calculate chroma offsets */
+		uoffset = buf->vb.width * buf->vb.height;
+		voffset = buf->vb.width * buf->vb.height;
+		if (buf->fmt->flags & FORMAT_FLAGS_CrCb) {
+			/* Y-Cr-Cb plane order */
+			uoffset >>= buf->fmt->hshift;
+			uoffset >>= buf->fmt->vshift;
+			uoffset  += voffset;
+		} else {
+			/* Y-Cb-Cr plane order */
+			voffset >>= buf->fmt->hshift;
+			voffset >>= buf->fmt->vshift;
+			voffset  += uoffset;
+		}
+
+		switch (buf->vb.field) {
+		case V4L2_FIELD_TOP:
+			bttv_calc_geo(btv,&buf->geo,buf->vb.width,
+				      buf->vb.height,0,buf->tvnorm);
+			bttv_risc_planar(btv, &buf->top, buf->vb.dma.sglist,
+					 0,buf->vb.width,0,buf->vb.height,
+					 uoffset,voffset,buf->fmt->hshift,
+					 buf->fmt->vshift,0);
+			break;
+		case V4L2_FIELD_BOTTOM:
+			bttv_calc_geo(btv,&buf->geo,buf->vb.width,
+				      buf->vb.height,0,buf->tvnorm);
+			bttv_risc_planar(btv, &buf->bottom, buf->vb.dma.sglist,
+					 0,buf->vb.width,0,buf->vb.height,
+					 uoffset,voffset,buf->fmt->hshift,
+					 buf->fmt->vshift,0);
+			break;
+		case V4L2_FIELD_INTERLACED:
+			bttv_calc_geo(btv,&buf->geo,buf->vb.width,
+				      buf->vb.height,1,buf->tvnorm);
+			lines    = buf->vb.height >> 1;
+			ypadding = buf->vb.width;
+			cpadding = buf->vb.width >> buf->fmt->hshift;
+			bttv_risc_planar(btv,&buf->top,
+					 buf->vb.dma.sglist,
+					 0,buf->vb.width,ypadding,lines,
+					 uoffset,voffset,
+					 buf->fmt->hshift,
+					 buf->fmt->vshift,
+					 cpadding);
+			bttv_risc_planar(btv,&buf->bottom,
+					 buf->vb.dma.sglist,
+					 ypadding,buf->vb.width,ypadding,lines,
+					 uoffset+cpadding,
+					 voffset+cpadding,
+					 buf->fmt->hshift,
+					 buf->fmt->vshift,
+					 cpadding);
+			break;
+		case V4L2_FIELD_SEQ_TB:
+			bttv_calc_geo(btv,&buf->geo,buf->vb.width,
+				      buf->vb.height,1,buf->tvnorm);
+			lines    = buf->vb.height >> 1;
+			ypadding = buf->vb.width;
+			cpadding = buf->vb.width >> buf->fmt->hshift;
+			bttv_risc_planar(btv,&buf->top,
+					 buf->vb.dma.sglist,
+					 0,buf->vb.width,0,lines,
+					 uoffset >> 1,
+					 voffset >> 1,
+					 buf->fmt->hshift,
+					 buf->fmt->vshift,
+					 0);
+			bttv_risc_planar(btv,&buf->bottom,
+					 buf->vb.dma.sglist,
+					 lines * ypadding,buf->vb.width,0,lines,
+					 lines * ypadding + (uoffset >> 1),
+					 lines * ypadding + (voffset >> 1),
+					 buf->fmt->hshift,
+					 buf->fmt->vshift,
+					 0);
+			break;
+		default:
+			BUG();
+		}
+	}
+
+	/* raw data */
+	if (buf->fmt->flags & FORMAT_FLAGS_RAW) {
+		/* build risc code */
+		buf->vb.field = V4L2_FIELD_SEQ_TB;
+		bttv_calc_geo(btv,&buf->geo,tvnorm->swidth,tvnorm->sheight,
+			      1,buf->tvnorm);
+		bttv_risc_packed(btv, &buf->top,  buf->vb.dma.sglist,
+				 0, RAW_BPL, 0, RAW_LINES);
+		bttv_risc_packed(btv, &buf->bottom, buf->vb.dma.sglist,
+				 buf->vb.size/2 , RAW_BPL, 0, RAW_LINES);
+	}
+
+	/* copy format info */
+	buf->btformat = buf->fmt->btformat;
+	buf->btswap   = buf->fmt->btswap;
+	return 0;
+}
+
+/* ---------------------------------------------------------- */
+
+/* calculate geometry, build risc code */
+int
+bttv_overlay_risc(struct bttv *btv,
+		  struct bttv_overlay *ov,
+		  const struct bttv_format *fmt,
+		  struct bttv_buffer *buf)
+{
+	/* check interleave, bottom+top fields */
+	dprintk(KERN_DEBUG
+		"bttv%d: overlay fields: %s format: %s  size: %dx%d\n",
+		btv->c.nr, v4l2_field_names[buf->vb.field],
+		fmt->name,ov->w.width,ov->w.height);
+
+	/* calculate geometry */
+	bttv_calc_geo(btv,&buf->geo,ov->w.width,ov->w.height,
+		      V4L2_FIELD_HAS_BOTH(ov->field), ov->tvnorm);
+
+	/* build risc code */
+	switch (ov->field) {
+	case V4L2_FIELD_TOP:
+		bttv_risc_overlay(btv, &buf->top,    fmt, ov, 0, 0);
+		break;
+	case V4L2_FIELD_BOTTOM:
+		bttv_risc_overlay(btv, &buf->bottom, fmt, ov, 0, 0);
+		break;
+	case V4L2_FIELD_INTERLACED:
+		bttv_risc_overlay(btv, &buf->top,    fmt, ov, 0, 1);
+		bttv_risc_overlay(btv, &buf->bottom, fmt, ov, 1, 0);
+		break;
+	default:
+		BUG();
+	}
+
+	/* copy format info */
+	buf->btformat = fmt->btformat;
+	buf->btswap   = fmt->btswap;
+	buf->vb.field = ov->field;
+	return 0;
+}
+
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */