/*
 * $Id: cx88-core.c,v 1.24 2005/01/19 12:01:55 kraxel Exp $
 *
 * device driver for Conexant 2388x based TV cards
 * driver core
 *
 * (c) 2003 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
 *
 *  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/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/kmod.h>
#include <linux/sound.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/videodev.h>

#include "cx88.h"

MODULE_DESCRIPTION("v4l2 driver module for cx2388x based TV cards");
MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
MODULE_LICENSE("GPL");

/* ------------------------------------------------------------------ */

static unsigned int core_debug = 0;
module_param(core_debug,int,0644);
MODULE_PARM_DESC(core_debug,"enable debug messages [core]");

static unsigned int latency = UNSET;
module_param(latency,int,0444);
MODULE_PARM_DESC(latency,"pci latency timer");

static unsigned int tuner[] = {[0 ... (CX88_MAXBOARDS - 1)] = UNSET };
static unsigned int card[]  = {[0 ... (CX88_MAXBOARDS - 1)] = UNSET };

module_param_array(tuner, int, NULL, 0444);
module_param_array(card,  int, NULL, 0444);

MODULE_PARM_DESC(tuner,"tuner type");
MODULE_PARM_DESC(card,"card type");

static unsigned int nicam = 0;
module_param(nicam,int,0644);
MODULE_PARM_DESC(nicam,"tv audio is nicam");

static unsigned int nocomb = 0;
module_param(nocomb,int,0644);
MODULE_PARM_DESC(nocomb,"disable comb filter");

#define dprintk(level,fmt, arg...)	if (core_debug >= level)	\
	printk(KERN_DEBUG "%s: " fmt, core->name , ## arg)

static unsigned int cx88_devcount;
static LIST_HEAD(cx88_devlist);
static DECLARE_MUTEX(devlist);

/* ------------------------------------------------------------------ */
/* debug help functions                                               */

static const char *v4l1_ioctls[] = {
	"0", "CGAP", "GCHAN", "SCHAN", "GTUNER", "STUNER", "GPICT", "SPICT",
	"CCAPTURE", "GWIN", "SWIN", "GFBUF", "SFBUF", "KEY", "GFREQ",
	"SFREQ", "GAUDIO", "SAUDIO", "SYNC", "MCAPTURE", "GMBUF", "GUNIT",
	"GCAPTURE", "SCAPTURE", "SPLAYMODE", "SWRITEMODE", "GPLAYINFO",
	"SMICROCODE", "GVBIFMT", "SVBIFMT" };
#define V4L1_IOCTLS ARRAY_SIZE(v4l1_ioctls)

static const char *v4l2_ioctls[] = {
	"QUERYCAP", "1", "ENUM_PIXFMT", "ENUM_FBUFFMT", "G_FMT", "S_FMT",
	"G_COMP", "S_COMP", "REQBUFS", "QUERYBUF", "G_FBUF", "S_FBUF",
	"G_WIN", "S_WIN", "PREVIEW", "QBUF", "16", "DQBUF", "STREAMON",
	"STREAMOFF", "G_PERF", "G_PARM", "S_PARM", "G_STD", "S_STD",
	"ENUMSTD", "ENUMINPUT", "G_CTRL", "S_CTRL", "G_TUNER", "S_TUNER",
	"G_FREQ", "S_FREQ", "G_AUDIO", "S_AUDIO", "35", "QUERYCTRL",
	"QUERYMENU", "G_INPUT", "S_INPUT", "ENUMCVT", "41", "42", "43",
	"44", "45",  "G_OUTPUT", "S_OUTPUT", "ENUMOUTPUT", "G_AUDOUT",
	"S_AUDOUT", "ENUMFX", "G_EFFECT", "S_EFFECT", "G_MODULATOR",
	"S_MODULATOR"
};
#define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls)

void cx88_print_ioctl(char *name, unsigned int cmd)
{
	char *dir;

	switch (_IOC_DIR(cmd)) {
	case _IOC_NONE:              dir = "--"; break;
	case _IOC_READ:              dir = "r-"; break;
	case _IOC_WRITE:             dir = "-w"; break;
	case _IOC_READ | _IOC_WRITE: dir = "rw"; break;
	default:                     dir = "??"; break;
	}
	switch (_IOC_TYPE(cmd)) {
	case 'v':
		printk(KERN_DEBUG "%s: ioctl 0x%08x (v4l1, %s, VIDIOC%s)\n",
		       name, cmd, dir, (_IOC_NR(cmd) < V4L1_IOCTLS) ?
		       v4l1_ioctls[_IOC_NR(cmd)] : "???");
		break;
	case 'V':
		printk(KERN_DEBUG "%s: ioctl 0x%08x (v4l2, %s, VIDIOC_%s)\n",
		       name, cmd, dir, (_IOC_NR(cmd) < V4L2_IOCTLS) ?
		       v4l2_ioctls[_IOC_NR(cmd)] : "???");
		break;
	default:
		printk(KERN_DEBUG "%s: ioctl 0x%08x (???, %s, #%d)\n",
		       name, cmd, dir, _IOC_NR(cmd));
	}
}

/* ------------------------------------------------------------------ */
#define NO_SYNC_LINE (-1U)

static u32* cx88_risc_field(u32 *rp, struct scatterlist *sglist,
			    unsigned int offset, u32 sync_line,
			    unsigned int bpl, unsigned int padding,
			    unsigned int lines)
{
	struct scatterlist *sg;
	unsigned int line,todo;

	/* sync instruction */
	if (sync_line != NO_SYNC_LINE)
		*(rp++) = cpu_to_le32(RISC_RESYNC | sync_line);

	/* scan lines */
	sg = sglist;
	for (line = 0; line < lines; line++) {
		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(RISC_WRITE|RISC_SOL|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(RISC_WRITE|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(RISC_WRITE|
						    sg_dma_len(sg));
                                *(rp++)=cpu_to_le32(sg_dma_address(sg));
				todo -= sg_dma_len(sg);
				sg++;
			}
                        *(rp++)=cpu_to_le32(RISC_WRITE|RISC_EOL|todo);
			*(rp++)=cpu_to_le32(sg_dma_address(sg));
			offset += todo;
		}
		offset += padding;
	}

	return rp;
}

int cx88_risc_buffer(struct pci_dev *pci, struct btcx_riscmem *risc,
		     struct scatterlist *sglist,
		     unsigned int top_offset, unsigned int bottom_offset,
		     unsigned int bpl, unsigned int padding, unsigned int lines)
{
	u32 instructions,fields;
	u32 *rp;
	int rc;

	fields = 0;
	if (UNSET != top_offset)
		fields++;
	if (UNSET != bottom_offset)
		fields++;

	/* estimate risc mem: worst case is one write per page border +
	   one write per scan line + syncs + jump (all 2 dwords) */
	instructions  = (bpl * lines * fields) / PAGE_SIZE + lines * fields;
	instructions += 3 + 4;
	if ((rc = btcx_riscmem_alloc(pci,risc,instructions*8)) < 0)
		return rc;

	/* write risc instructions */
	rp = risc->cpu;
	if (UNSET != top_offset)
		rp = cx88_risc_field(rp, sglist, top_offset, 0,
				     bpl, padding, lines);
	if (UNSET != bottom_offset)
		rp = cx88_risc_field(rp, sglist, bottom_offset, 0x200,
				     bpl, padding, lines);

	/* save pointer to jmp instruction address */
	risc->jmp = rp;
	BUG_ON((risc->jmp - risc->cpu + 2) / 4 > risc->size);
	return 0;
}

int cx88_risc_databuffer(struct pci_dev *pci, struct btcx_riscmem *risc,
			 struct scatterlist *sglist, unsigned int bpl,
			 unsigned int lines)
{
	u32 instructions;
	u32 *rp;
	int rc;

	/* estimate risc mem: worst case is one write per page border +
	   one write per scan line + syncs + jump (all 2 dwords) */
	instructions  = (bpl * lines) / PAGE_SIZE + lines;
	instructions += 3 + 4;
	if ((rc = btcx_riscmem_alloc(pci,risc,instructions*8)) < 0)
		return rc;

	/* write risc instructions */
	rp = risc->cpu;
	rp = cx88_risc_field(rp, sglist, 0, NO_SYNC_LINE, bpl, 0, lines);

	/* save pointer to jmp instruction address */
	risc->jmp = rp;
	BUG_ON((risc->jmp - risc->cpu + 2) / 4 > risc->size);
	return 0;
}

int cx88_risc_stopper(struct pci_dev *pci, struct btcx_riscmem *risc,
		      u32 reg, u32 mask, u32 value)
{
	u32 *rp;
	int rc;

	if ((rc = btcx_riscmem_alloc(pci, risc, 4*16)) < 0)
		return rc;

	/* write risc instructions */
	rp = risc->cpu;
	*(rp++) = cpu_to_le32(RISC_WRITECR  | RISC_IRQ2 | RISC_IMM);
	*(rp++) = cpu_to_le32(reg);
	*(rp++) = cpu_to_le32(value);
	*(rp++) = cpu_to_le32(mask);
	*(rp++) = cpu_to_le32(RISC_JUMP);
	*(rp++) = cpu_to_le32(risc->dma);
	return 0;
}

void
cx88_free_buffer(struct pci_dev *pci, struct cx88_buffer *buf)
{
	if (in_interrupt())
		BUG();
	videobuf_waiton(&buf->vb,0,0);
	videobuf_dma_pci_unmap(pci, &buf->vb.dma);
	videobuf_dma_free(&buf->vb.dma);
	btcx_riscmem_free(pci, &buf->risc);
	buf->vb.state = STATE_NEEDS_INIT;
}

/* ------------------------------------------------------------------ */
/* our SRAM memory layout                                             */

/* we are going to put all thr risc programs into host memory, so we
 * can use the whole SDRAM for the DMA fifos.  To simplify things, we
 * use a static memory layout.  That surely will waste memory in case
 * we don't use all DMA channels at the same time (which will be the
 * case most of the time).  But that still gives us enougth FIFO space
 * to be able to deal with insane long pci latencies ...
 *
 * FIFO space allocations:
 *    channel  21    (y video)  - 10.0k
 *    channel  22    (u video)  -  2.0k
 *    channel  23    (v video)  -  2.0k
 *    channel  24    (vbi)      -  4.0k
 *    channels 25+26 (audio)    -  0.5k
 *    channel  28    (mpeg)     -  4.0k
 *    TOTAL                     = 25.5k
 *
 * Every channel has 160 bytes control data (64 bytes instruction
 * queue and 6 CDT entries), which is close to 2k total.
 *
 * Address layout:
 *    0x0000 - 0x03ff    CMDs / reserved
 *    0x0400 - 0x0bff    instruction queues + CDs
 *    0x0c00 -           FIFOs
 */

struct sram_channel cx88_sram_channels[] = {
	[SRAM_CH21] = {
		.name       = "video y / packed",
		.cmds_start = 0x180040,
		.ctrl_start = 0x180400,
	        .cdt        = 0x180400 + 64,
		.fifo_start = 0x180c00,
		.fifo_size  = 0x002800,
		.ptr1_reg   = MO_DMA21_PTR1,
		.ptr2_reg   = MO_DMA21_PTR2,
		.cnt1_reg   = MO_DMA21_CNT1,
		.cnt2_reg   = MO_DMA21_CNT2,
	},
	[SRAM_CH22] = {
		.name       = "video u",
		.cmds_start = 0x180080,
		.ctrl_start = 0x1804a0,
	        .cdt        = 0x1804a0 + 64,
		.fifo_start = 0x183400,
		.fifo_size  = 0x000800,
		.ptr1_reg   = MO_DMA22_PTR1,
		.ptr2_reg   = MO_DMA22_PTR2,
		.cnt1_reg   = MO_DMA22_CNT1,
		.cnt2_reg   = MO_DMA22_CNT2,
	},
	[SRAM_CH23] = {
		.name       = "video v",
		.cmds_start = 0x1800c0,
		.ctrl_start = 0x180540,
	        .cdt        = 0x180540 + 64,
		.fifo_start = 0x183c00,
		.fifo_size  = 0x000800,
		.ptr1_reg   = MO_DMA23_PTR1,
		.ptr2_reg   = MO_DMA23_PTR2,
		.cnt1_reg   = MO_DMA23_CNT1,
		.cnt2_reg   = MO_DMA23_CNT2,
	},
	[SRAM_CH24] = {
		.name       = "vbi",
		.cmds_start = 0x180100,
		.ctrl_start = 0x1805e0,
	        .cdt        = 0x1805e0 + 64,
		.fifo_start = 0x184400,
		.fifo_size  = 0x001000,
		.ptr1_reg   = MO_DMA24_PTR1,
		.ptr2_reg   = MO_DMA24_PTR2,
		.cnt1_reg   = MO_DMA24_CNT1,
		.cnt2_reg   = MO_DMA24_CNT2,
	},
	[SRAM_CH25] = {
		.name       = "audio from",
		.cmds_start = 0x180140,
		.ctrl_start = 0x180680,
	        .cdt        = 0x180680 + 64,
		.fifo_start = 0x185400,
		.fifo_size  = 0x000200,
		.ptr1_reg   = MO_DMA25_PTR1,
		.ptr2_reg   = MO_DMA25_PTR2,
		.cnt1_reg   = MO_DMA25_CNT1,
		.cnt2_reg   = MO_DMA25_CNT2,
	},
	[SRAM_CH26] = {
		.name       = "audio to",
		.cmds_start = 0x180180,
		.ctrl_start = 0x180720,
	        .cdt        = 0x180680 + 64,  /* same as audio IN */
		.fifo_start = 0x185400,       /* same as audio IN */
		.fifo_size  = 0x000200,       /* same as audio IN */
		.ptr1_reg   = MO_DMA26_PTR1,
		.ptr2_reg   = MO_DMA26_PTR2,
		.cnt1_reg   = MO_DMA26_CNT1,
		.cnt2_reg   = MO_DMA26_CNT2,
	},
	[SRAM_CH28] = {
		.name       = "mpeg",
		.cmds_start = 0x180200,
		.ctrl_start = 0x1807C0,
		.cdt        = 0x1807C0 + 64,
		.fifo_start = 0x185600,
		.fifo_size  = 0x001000,
		.ptr1_reg   = MO_DMA28_PTR1,
		.ptr2_reg   = MO_DMA28_PTR2,
		.cnt1_reg   = MO_DMA28_CNT1,
		.cnt2_reg   = MO_DMA28_CNT2,
	},
};

int cx88_sram_channel_setup(struct cx88_core *core,
			    struct sram_channel *ch,
			    unsigned int bpl, u32 risc)
{
	unsigned int i,lines;
	u32 cdt;

	bpl   = (bpl + 7) & ~7; /* alignment */
	cdt   = ch->cdt;
	lines = ch->fifo_size / bpl;
	if (lines > 6)
		lines = 6;
	BUG_ON(lines < 2);

	/* write CDT */
	for (i = 0; i < lines; i++)
		cx_write(cdt + 16*i, ch->fifo_start + bpl*i);

	/* write CMDS */
	cx_write(ch->cmds_start +  0, risc);
	cx_write(ch->cmds_start +  4, cdt);
	cx_write(ch->cmds_start +  8, (lines*16) >> 3);
	cx_write(ch->cmds_start + 12, ch->ctrl_start);
	cx_write(ch->cmds_start + 16, 64 >> 2);
	for (i = 20; i < 64; i += 4)
		cx_write(ch->cmds_start + i, 0);

	/* fill registers */
	cx_write(ch->ptr1_reg, ch->fifo_start);
	cx_write(ch->ptr2_reg, cdt);
	cx_write(ch->cnt1_reg, (bpl >> 3) -1);
	cx_write(ch->cnt2_reg, (lines*16) >> 3);

	dprintk(2,"sram setup %s: bpl=%d lines=%d\n", ch->name, bpl, lines);
	return 0;
}

/* ------------------------------------------------------------------ */
/* debug helper code                                                  */

int cx88_risc_decode(u32 risc)
{
	static char *instr[16] = {
		[ RISC_SYNC    >> 28 ] = "sync",
		[ RISC_WRITE   >> 28 ] = "write",
		[ RISC_WRITEC  >> 28 ] = "writec",
		[ RISC_READ    >> 28 ] = "read",
		[ RISC_READC   >> 28 ] = "readc",
		[ RISC_JUMP    >> 28 ] = "jump",
		[ RISC_SKIP    >> 28 ] = "skip",
		[ RISC_WRITERM >> 28 ] = "writerm",
		[ RISC_WRITECM >> 28 ] = "writecm",
		[ RISC_WRITECR >> 28 ] = "writecr",
	};
	static int incr[16] = {
		[ RISC_WRITE   >> 28 ] = 2,
		[ RISC_JUMP    >> 28 ] = 2,
		[ RISC_WRITERM >> 28 ] = 3,
		[ RISC_WRITECM >> 28 ] = 3,
		[ RISC_WRITECR >> 28 ] = 4,
	};
	static char *bits[] = {
		"12",   "13",   "14",   "resync",
		"cnt0", "cnt1", "18",   "19",
		"20",   "21",   "22",   "23",
		"irq1", "irq2", "eol",  "sol",
	};
	int i;

	printk("0x%08x [ %s", risc,
	       instr[risc >> 28] ? instr[risc >> 28] : "INVALID");
	for (i = ARRAY_SIZE(bits)-1; i >= 0; i--)
		if (risc & (1 << (i + 12)))
			printk(" %s",bits[i]);
	printk(" count=%d ]\n", risc & 0xfff);
	return incr[risc >> 28] ? incr[risc >> 28] : 1;
}

#if 0 /* currently unused, but useful for debugging */
void cx88_risc_disasm(struct cx88_core *core,
		      struct btcx_riscmem *risc)
{
	unsigned int i,j,n;

	printk("%s: risc disasm: %p [dma=0x%08lx]\n",
	       core->name, risc->cpu, (unsigned long)risc->dma);
	for (i = 0; i < (risc->size >> 2); i += n) {
		printk("%s:   %04d: ", core->name, i);
		n = cx88_risc_decode(risc->cpu[i]);
		for (j = 1; j < n; j++)
			printk("%s:   %04d: 0x%08x [ arg #%d ]\n",
			       core->name, i+j, risc->cpu[i+j], j);
		if (risc->cpu[i] == RISC_JUMP)
			break;
	}
}
#endif

void cx88_sram_channel_dump(struct cx88_core *core,
			    struct sram_channel *ch)
{
	static char *name[] = {
		"initial risc",
		"cdt base",
		"cdt size",
		"iq base",
		"iq size",
		"risc pc",
		"iq wr ptr",
		"iq rd ptr",
		"cdt current",
		"pci target",
		"line / byte",
	};
	u32 risc;
	unsigned int i,j,n;

	printk("%s: %s - dma channel status dump\n",
	       core->name,ch->name);
	for (i = 0; i < ARRAY_SIZE(name); i++)
		printk("%s:   cmds: %-12s: 0x%08x\n",
		       core->name,name[i],
		       cx_read(ch->cmds_start + 4*i));
	for (i = 0; i < 4; i++) {
		risc = cx_read(ch->cmds_start + 4 * (i+11));
		printk("%s:   risc%d: ", core->name, i);
		cx88_risc_decode(risc);
	}
	for (i = 0; i < 16; i += n) {
		risc = cx_read(ch->ctrl_start + 4 * i);
		printk("%s:   iq %x: ", core->name, i);
		n = cx88_risc_decode(risc);
		for (j = 1; j < n; j++) {
			risc = cx_read(ch->ctrl_start + 4 * (i+j));
			printk("%s:   iq %x: 0x%08x [ arg #%d ]\n",
			       core->name, i+j, risc, j);
		}
	}

	printk("%s: fifo: 0x%08x -> 0x%x\n",
	       core->name, ch->fifo_start, ch->fifo_start+ch->fifo_size);
	printk("%s: ctrl: 0x%08x -> 0x%x\n",
	       core->name, ch->ctrl_start, ch->ctrl_start+6*16);
	printk("%s:   ptr1_reg: 0x%08x\n",
	       core->name,cx_read(ch->ptr1_reg));
	printk("%s:   ptr2_reg: 0x%08x\n",
	       core->name,cx_read(ch->ptr2_reg));
	printk("%s:   cnt1_reg: 0x%08x\n",
	       core->name,cx_read(ch->cnt1_reg));
	printk("%s:   cnt2_reg: 0x%08x\n",
	       core->name,cx_read(ch->cnt2_reg));
}

char *cx88_pci_irqs[32] = {
	"vid", "aud", "ts", "vip", "hst", "5", "6", "tm1",
	"src_dma", "dst_dma", "risc_rd_err", "risc_wr_err",
	"brdg_err", "src_dma_err", "dst_dma_err", "ipb_dma_err",
	"i2c", "i2c_rack", "ir_smp", "gpio0", "gpio1"
};
char *cx88_vid_irqs[32] = {
	"y_risci1", "u_risci1", "v_risci1", "vbi_risc1",
	"y_risci2", "u_risci2", "v_risci2", "vbi_risc2",
	"y_oflow",  "u_oflow",  "v_oflow",  "vbi_oflow",
	"y_sync",   "u_sync",   "v_sync",   "vbi_sync",
	"opc_err",  "par_err",  "rip_err",  "pci_abort",
};
char *cx88_mpeg_irqs[32] = {
	"ts_risci1", NULL, NULL, NULL,
	"ts_risci2", NULL, NULL, NULL,
	"ts_oflow",  NULL, NULL, NULL,
	"ts_sync",   NULL, NULL, NULL,
	"opc_err", "par_err", "rip_err", "pci_abort",
	"ts_err?",
};

void cx88_print_irqbits(char *name, char *tag, char **strings,
			u32 bits, u32 mask)
{
	unsigned int i;

	printk(KERN_DEBUG "%s: %s [0x%x]", name, tag, bits);
	for (i = 0; i < 32; i++) {
		if (!(bits & (1 << i)))
			continue;
		if (strings[i])
			printk(" %s", strings[i]);
		else
			printk(" %d", i);
		if (!(mask & (1 << i)))
			continue;
		printk("*");
	}
	printk("\n");
}

/* ------------------------------------------------------------------ */

int cx88_core_irq(struct cx88_core *core, u32 status)
{
	int handled = 0;

	if (status & (1<<18)) {
		cx88_ir_irq(core);
		handled++;
	}
	if (!handled)
		cx88_print_irqbits(core->name, "irq pci",
				   cx88_pci_irqs, status,
				   core->pci_irqmask);
	return handled;
}

void cx88_wakeup(struct cx88_core *core,
		 struct cx88_dmaqueue *q, u32 count)
{
	struct cx88_buffer *buf;
	int bc;

	for (bc = 0;; bc++) {
		if (list_empty(&q->active))
			break;
		buf = list_entry(q->active.next,
				 struct cx88_buffer, vb.queue);
#if 0
		if (buf->count > count)
			break;
#else
		/* count comes from the hw and is is 16bit wide --
		 * this trick handles wrap-arounds correctly for
		 * up to 32767 buffers in flight... */
		if ((s16) (count - buf->count) < 0)
			break;
#endif
		do_gettimeofday(&buf->vb.ts);
		dprintk(2,"[%p/%d] wakeup reg=%d buf=%d\n",buf,buf->vb.i,
			count, buf->count);
		buf->vb.state = STATE_DONE;
		list_del(&buf->vb.queue);
		wake_up(&buf->vb.done);
	}
	if (list_empty(&q->active)) {
		del_timer(&q->timeout);
	} else {
		mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);
	}
	if (bc != 1)
		printk("%s: %d buffers handled (should be 1)\n",__FUNCTION__,bc);
}

void cx88_shutdown(struct cx88_core *core)
{
	/* disable RISC controller + IRQs */
	cx_write(MO_DEV_CNTRL2, 0);

	/* stop dma transfers */
	cx_write(MO_VID_DMACNTRL, 0x0);
	cx_write(MO_AUD_DMACNTRL, 0x0);
	cx_write(MO_TS_DMACNTRL, 0x0);
	cx_write(MO_VIP_DMACNTRL, 0x0);
	cx_write(MO_GPHST_DMACNTRL, 0x0);

	/* stop interrupts */
	cx_write(MO_PCI_INTMSK, 0x0);
	cx_write(MO_VID_INTMSK, 0x0);
	cx_write(MO_AUD_INTMSK, 0x0);
	cx_write(MO_TS_INTMSK, 0x0);
	cx_write(MO_VIP_INTMSK, 0x0);
	cx_write(MO_GPHST_INTMSK, 0x0);

	/* stop capturing */
	cx_write(VID_CAPTURE_CONTROL, 0);
}

int cx88_reset(struct cx88_core *core)
{
	dprintk(1,"%s\n",__FUNCTION__);
	cx88_shutdown(core);

	/* clear irq status */
	cx_write(MO_VID_INTSTAT, 0xFFFFFFFF); // Clear PIV int
	cx_write(MO_PCI_INTSTAT, 0xFFFFFFFF); // Clear PCI int
	cx_write(MO_INT1_STAT,   0xFFFFFFFF); // Clear RISC int

	/* wait a bit */
	msleep(100);

	/* init sram */
	cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH21], 720*4, 0);
	cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH22], 128, 0);
	cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH23], 128, 0);
	cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH24], 128, 0);
	cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH25], 128, 0);
	cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH26], 128, 0);
	cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH28], 188*4, 0);

	/* misc init ... */
	cx_write(MO_INPUT_FORMAT, ((1 << 13) |   // agc enable
				   (1 << 12) |   // agc gain
				   (1 << 11) |   // adaptibe agc
				   (0 << 10) |   // chroma agc
				   (0 <<  9) |   // ckillen
				   (7)));

	/* setup image format */
	cx_andor(MO_COLOR_CTRL, 0x4000, 0x4000);

	/* setup FIFO Threshholds */
	cx_write(MO_PDMA_STHRSH,   0x0807);
	cx_write(MO_PDMA_DTHRSH,   0x0807);

	/* fixes flashing of image */
	cx_write(MO_AGC_SYNC_TIP1, 0x0380000F);
	cx_write(MO_AGC_BACK_VBI,  0x00E00555);

	cx_write(MO_VID_INTSTAT,   0xFFFFFFFF); // Clear PIV int
	cx_write(MO_PCI_INTSTAT,   0xFFFFFFFF); // Clear PCI int
	cx_write(MO_INT1_STAT,     0xFFFFFFFF); // Clear RISC int

	/* Reset on-board parts */
	cx_write(MO_SRST_IO, 0);
	msleep(10);
	cx_write(MO_SRST_IO, 1);

	return 0;
}

/* ------------------------------------------------------------------ */

static unsigned int inline norm_swidth(struct cx88_tvnorm *norm)
{
	return (norm->id & V4L2_STD_625_50) ? 922 : 754;
}

static unsigned int inline norm_hdelay(struct cx88_tvnorm *norm)
{
	return (norm->id & V4L2_STD_625_50) ? 186 : 135;
}

static unsigned int inline norm_vdelay(struct cx88_tvnorm *norm)
{
	return (norm->id & V4L2_STD_625_50) ? 0x24 : 0x18;
}

static unsigned int inline norm_fsc8(struct cx88_tvnorm *norm)
{
	static const unsigned int ntsc = 28636360;
	static const unsigned int pal  = 35468950;

	return (norm->id & V4L2_STD_625_50) ? pal : ntsc;
}

static unsigned int inline norm_notchfilter(struct cx88_tvnorm *norm)
{
	return (norm->id & V4L2_STD_625_50)
		? HLNotchFilter135PAL
		: HLNotchFilter135NTSC;
}

static unsigned int inline norm_htotal(struct cx88_tvnorm *norm)
{
	return (norm->id & V4L2_STD_625_50) ? 1135 : 910;
}

static unsigned int inline norm_vbipack(struct cx88_tvnorm *norm)
{
	return (norm->id & V4L2_STD_625_50) ? 511 : 288;
}

int cx88_set_scale(struct cx88_core *core, unsigned int width, unsigned int height,
		   enum v4l2_field field)
{
	unsigned int swidth  = norm_swidth(core->tvnorm);
	unsigned int sheight = norm_maxh(core->tvnorm);
	u32 value;

	dprintk(1,"set_scale: %dx%d [%s%s,%s]\n", width, height,
		V4L2_FIELD_HAS_TOP(field)    ? "T" : "",
		V4L2_FIELD_HAS_BOTTOM(field) ? "B" : "",
		core->tvnorm->name);
	if (!V4L2_FIELD_HAS_BOTH(field))
		height *= 2;

	// recalc H delay and scale registers
	value = (width * norm_hdelay(core->tvnorm)) / swidth;
	value &= 0x3fe;
	cx_write(MO_HDELAY_EVEN,  value);
	cx_write(MO_HDELAY_ODD,   value);
	dprintk(1,"set_scale: hdelay  0x%04x\n", value);

	value = (swidth * 4096 / width) - 4096;
	cx_write(MO_HSCALE_EVEN,  value);
	cx_write(MO_HSCALE_ODD,   value);
	dprintk(1,"set_scale: hscale  0x%04x\n", value);

	cx_write(MO_HACTIVE_EVEN, width);
	cx_write(MO_HACTIVE_ODD,  width);
	dprintk(1,"set_scale: hactive 0x%04x\n", width);

	// recalc V scale Register (delay is constant)
	cx_write(MO_VDELAY_EVEN, norm_vdelay(core->tvnorm));
	cx_write(MO_VDELAY_ODD,  norm_vdelay(core->tvnorm));
	dprintk(1,"set_scale: vdelay  0x%04x\n", norm_vdelay(core->tvnorm));

	value = (0x10000 - (sheight * 512 / height - 512)) & 0x1fff;
	cx_write(MO_VSCALE_EVEN,  value);
	cx_write(MO_VSCALE_ODD,   value);
	dprintk(1,"set_scale: vscale  0x%04x\n", value);

	cx_write(MO_VACTIVE_EVEN, sheight);
	cx_write(MO_VACTIVE_ODD,  sheight);
	dprintk(1,"set_scale: vactive 0x%04x\n", sheight);

	// setup filters
	value = 0;
	value |= (1 << 19);        // CFILT (default)
	if (core->tvnorm->id & V4L2_STD_SECAM) {
		value |= (1 << 15);
		value |= (1 << 16);
	}
	if (INPUT(core->input)->type == CX88_VMUX_SVIDEO)
		value |= (1 << 13) | (1 << 5);
	if (V4L2_FIELD_INTERLACED == field)
		value |= (1 << 3); // VINT (interlaced vertical scaling)
	if (width < 385)
		value |= (1 << 0); // 3-tap interpolation
	if (width < 193)
		value |= (1 << 1); // 5-tap interpolation
	if (nocomb)
		value |= (3 << 5); // disable comb filter

	cx_write(MO_FILTER_EVEN,  value);
	cx_write(MO_FILTER_ODD,   value);
	dprintk(1,"set_scale: filter  0x%04x\n", value);

	return 0;
}

static const u32 xtal = 28636363;

static int set_pll(struct cx88_core *core, int prescale, u32 ofreq)
{
	static u32 pre[] = { 0, 0, 0, 3, 2, 1 };
	u64 pll;
	u32 reg;
	int i;

	if (prescale < 2)
		prescale = 2;
	if (prescale > 5)
		prescale = 5;

	pll = ofreq * 8 * prescale * (u64)(1 << 20);
	do_div(pll,xtal);
	reg = (pll & 0x3ffffff) | (pre[prescale] << 26);
	if (((reg >> 20) & 0x3f) < 14) {
		printk("%s/0: pll out of range\n",core->name);
		return -1;
	}

	dprintk(1,"set_pll:    MO_PLL_REG       0x%08x [old=0x%08x,freq=%d]\n",
		reg, cx_read(MO_PLL_REG), ofreq);
	cx_write(MO_PLL_REG, reg);
	for (i = 0; i < 100; i++) {
		reg = cx_read(MO_DEVICE_STATUS);
		if (reg & (1<<2)) {
			dprintk(1,"pll locked [pre=%d,ofreq=%d]\n",
				prescale,ofreq);
			return 0;
		}
		dprintk(1,"pll not locked yet, waiting ...\n");
		msleep(10);
	}
	dprintk(1,"pll NOT locked [pre=%d,ofreq=%d]\n",prescale,ofreq);
	return -1;
}

static int set_tvaudio(struct cx88_core *core)
{
	struct cx88_tvnorm *norm = core->tvnorm;

	if (CX88_VMUX_TELEVISION != INPUT(core->input)->type)
		return 0;

	if (V4L2_STD_PAL_BG & norm->id) {
		core->tvaudio = nicam ? WW_NICAM_BGDKL : WW_A2_BG;

	} else if (V4L2_STD_PAL_DK & norm->id) {
		core->tvaudio = nicam ? WW_NICAM_BGDKL : WW_A2_DK;

	} else if (V4L2_STD_PAL_I & norm->id) {
		core->tvaudio = WW_NICAM_I;

	} else if (V4L2_STD_SECAM_L & norm->id) {
		core->tvaudio = WW_SYSTEM_L_AM;

	} else if (V4L2_STD_SECAM_DK & norm->id) {
		core->tvaudio = WW_A2_DK;

	} else if ((V4L2_STD_NTSC_M & norm->id) ||
		   (V4L2_STD_PAL_M  & norm->id)) {
		core->tvaudio = WW_BTSC;

	} else if (V4L2_STD_NTSC_M_JP & norm->id) {
		core->tvaudio = WW_EIAJ;

	} else {
		printk("%s/0: tvaudio support needs work for this tv norm [%s], sorry\n",
		       core->name, norm->name);
		core->tvaudio = 0;
		return 0;
	}

	cx_andor(MO_AFECFG_IO, 0x1f, 0x0);
	cx88_set_tvaudio(core);
	// cx88_set_stereo(dev,V4L2_TUNER_MODE_STEREO);

	cx_write(MO_AUDD_LNGTH,    128); /* fifo size */
	cx_write(MO_AUDR_LNGTH,    128); /* fifo size */
	cx_write(MO_AUD_DMACNTRL, 0x03); /* need audio fifo */
	return 0;
}

int cx88_set_tvnorm(struct cx88_core *core, struct cx88_tvnorm *norm)
{
	u32 fsc8;
	u32 adc_clock;
	u32 vdec_clock;
	u32 step_db,step_dr;
	u64 tmp64;
	u32 bdelay,agcdelay,htotal;

	core->tvnorm = norm;
	fsc8       = norm_fsc8(norm);
	adc_clock  = xtal;
	vdec_clock = fsc8;
	step_db    = fsc8;
	step_dr    = fsc8;

	if (norm->id & V4L2_STD_SECAM) {
		step_db = 4250000 * 8;
		step_dr = 4406250 * 8;
	}

	dprintk(1,"set_tvnorm: \"%s\" fsc8=%d adc=%d vdec=%d db/dr=%d/%d\n",
		norm->name, fsc8, adc_clock, vdec_clock, step_db, step_dr);
	set_pll(core,2,vdec_clock);

	dprintk(1,"set_tvnorm: MO_INPUT_FORMAT  0x%08x [old=0x%08x]\n",
		norm->cxiformat, cx_read(MO_INPUT_FORMAT) & 0x0f);
	cx_andor(MO_INPUT_FORMAT, 0xf, norm->cxiformat);

#if 1
	// FIXME: as-is from DScaler
	dprintk(1,"set_tvnorm: MO_OUTPUT_FORMAT 0x%08x [old=0x%08x]\n",
		norm->cxoformat, cx_read(MO_OUTPUT_FORMAT));
	cx_write(MO_OUTPUT_FORMAT, norm->cxoformat);
#endif

	// MO_SCONV_REG = adc clock / video dec clock * 2^17
	tmp64  = adc_clock * (u64)(1 << 17);
	do_div(tmp64, vdec_clock);
	dprintk(1,"set_tvnorm: MO_SCONV_REG     0x%08x [old=0x%08x]\n",
		(u32)tmp64, cx_read(MO_SCONV_REG));
	cx_write(MO_SCONV_REG, (u32)tmp64);

	// MO_SUB_STEP = 8 * fsc / video dec clock * 2^22
	tmp64  = step_db * (u64)(1 << 22);
	do_div(tmp64, vdec_clock);
	dprintk(1,"set_tvnorm: MO_SUB_STEP      0x%08x [old=0x%08x]\n",
		(u32)tmp64, cx_read(MO_SUB_STEP));
	cx_write(MO_SUB_STEP, (u32)tmp64);

	// MO_SUB_STEP_DR = 8 * 4406250 / video dec clock * 2^22
	tmp64  = step_dr * (u64)(1 << 22);
	do_div(tmp64, vdec_clock);
	dprintk(1,"set_tvnorm: MO_SUB_STEP_DR   0x%08x [old=0x%08x]\n",
		(u32)tmp64, cx_read(MO_SUB_STEP_DR));
	cx_write(MO_SUB_STEP_DR, (u32)tmp64);

	// bdelay + agcdelay
	bdelay   = vdec_clock * 65 / 20000000 + 21;
	agcdelay = vdec_clock * 68 / 20000000 + 15;
	dprintk(1,"set_tvnorm: MO_AGC_BURST     0x%08x [old=0x%08x,bdelay=%d,agcdelay=%d]\n",
		(bdelay << 8) | agcdelay, cx_read(MO_AGC_BURST), bdelay, agcdelay);
	cx_write(MO_AGC_BURST, (bdelay << 8) | agcdelay);

	// htotal
	tmp64 = norm_htotal(norm) * (u64)vdec_clock;
	do_div(tmp64, fsc8);
	htotal = (u32)tmp64 | (norm_notchfilter(norm) << 11);
	dprintk(1,"set_tvnorm: MO_HTOTAL        0x%08x [old=0x%08x,htotal=%d]\n",
		htotal, cx_read(MO_HTOTAL), (u32)tmp64);
	cx_write(MO_HTOTAL, htotal);

	// vbi stuff
	cx_write(MO_VBI_PACKET, ((1 << 11) | /* (norm_vdelay(norm)   << 11) | */
				 norm_vbipack(norm)));

	// this is needed as well to set all tvnorm parameter
	cx88_set_scale(core, 320, 240, V4L2_FIELD_INTERLACED);

	// audio
	set_tvaudio(core);

	// tell i2c chips
#ifdef V4L2_I2C_CLIENTS
	cx88_call_i2c_clients(core,VIDIOC_S_STD,&norm->id);
#else
	{
		struct video_channel c;
		memset(&c,0,sizeof(c));
		c.channel = core->input;
		c.norm = VIDEO_MODE_PAL;
		if ((norm->id & (V4L2_STD_NTSC_M|V4L2_STD_NTSC_M_JP)))
			c.norm = VIDEO_MODE_NTSC;
		if (norm->id & V4L2_STD_SECAM)
			c.norm = VIDEO_MODE_SECAM;
		cx88_call_i2c_clients(core,VIDIOCSCHAN,&c);
	}
#endif

	// done
	return 0;
}

/* ------------------------------------------------------------------ */

static int cx88_pci_quirks(char *name, struct pci_dev *pci)
{
	unsigned int lat = UNSET;
	u8 ctrl = 0;
	u8 value;

	/* check pci quirks */
	if (pci_pci_problems & PCIPCI_TRITON) {
		printk(KERN_INFO "%s: quirk: PCIPCI_TRITON -- set TBFX\n",
		       name);
		ctrl |= CX88X_EN_TBFX;
	}
	if (pci_pci_problems & PCIPCI_NATOMA) {
		printk(KERN_INFO "%s: quirk: PCIPCI_NATOMA -- set TBFX\n",
		       name);
		ctrl |= CX88X_EN_TBFX;
	}
	if (pci_pci_problems & PCIPCI_VIAETBF) {
		printk(KERN_INFO "%s: quirk: PCIPCI_VIAETBF -- set TBFX\n",
		       name);
		ctrl |= CX88X_EN_TBFX;
	}
	if (pci_pci_problems & PCIPCI_VSFX) {
		printk(KERN_INFO "%s: quirk: PCIPCI_VSFX -- set VSFX\n",
		       name);
		ctrl |= CX88X_EN_VSFX;
	}
#ifdef PCIPCI_ALIMAGIK
	if (pci_pci_problems & PCIPCI_ALIMAGIK) {
		printk(KERN_INFO "%s: quirk: PCIPCI_ALIMAGIK -- latency fixup\n",
		       name);
		lat = 0x0A;
	}
#endif

	/* check insmod options */
	if (UNSET != latency)
		lat = latency;

	/* apply stuff */
	if (ctrl) {
		pci_read_config_byte(pci, CX88X_DEVCTRL, &value);
		value |= ctrl;
		pci_write_config_byte(pci, CX88X_DEVCTRL, value);
	}
	if (UNSET != lat) {
		printk(KERN_INFO "%s: setting pci latency timer to %d\n",
		       name, latency);
		pci_write_config_byte(pci, PCI_LATENCY_TIMER, latency);
	}
	return 0;
}

/* ------------------------------------------------------------------ */

struct video_device *cx88_vdev_init(struct cx88_core *core,
				    struct pci_dev *pci,
				    struct video_device *template,
				    char *type)
{
	struct video_device *vfd;

	vfd = video_device_alloc();
	if (NULL == vfd)
		return NULL;
	*vfd = *template;
	vfd->minor   = -1;
	vfd->dev     = &pci->dev;
	vfd->release = video_device_release;
	snprintf(vfd->name, sizeof(vfd->name), "%s %s (%s)",
		 core->name, type, cx88_boards[core->board].name);
	return vfd;
}

static int get_ressources(struct cx88_core *core, struct pci_dev *pci)
{
	if (request_mem_region(pci_resource_start(pci,0),
			       pci_resource_len(pci,0),
			       core->name))
		return 0;
	printk(KERN_ERR "%s: can't get MMIO memory @ 0x%lx\n",
	       core->name,pci_resource_start(pci,0));
	return -EBUSY;
}

struct cx88_core* cx88_core_get(struct pci_dev *pci)
{
	struct cx88_core *core;
	struct list_head *item;
	int i;

	down(&devlist);
	list_for_each(item,&cx88_devlist) {
		core = list_entry(item, struct cx88_core, devlist);
		if (pci->bus->number != core->pci_bus)
			continue;
		if (PCI_SLOT(pci->devfn) != core->pci_slot)
			continue;

		if (0 != get_ressources(core,pci))
			goto fail_unlock;
		atomic_inc(&core->refcount);
		up(&devlist);
		return core;
	}
	core = kmalloc(sizeof(*core),GFP_KERNEL);
	if (NULL == core)
		goto fail_unlock;

	memset(core,0,sizeof(*core));
	atomic_inc(&core->refcount);
	core->pci_bus  = pci->bus->number;
	core->pci_slot = PCI_SLOT(pci->devfn);
	core->pci_irqmask = 0x00fc00;

	core->nr = cx88_devcount++;
	sprintf(core->name,"cx88[%d]",core->nr);
	if (0 != get_ressources(core,pci)) {
		cx88_devcount--;
		goto fail_free;
	}
	list_add_tail(&core->devlist,&cx88_devlist);

	/* PCI stuff */
	cx88_pci_quirks(core->name, pci);
	core->lmmio = ioremap(pci_resource_start(pci,0),
			      pci_resource_len(pci,0));
	core->bmmio = (u8 __iomem *)core->lmmio;

	/* board config */
	core->board = UNSET;
	if (card[core->nr] < cx88_bcount)
		core->board = card[core->nr];
	for (i = 0; UNSET == core->board  &&  i < cx88_idcount; i++)
		if (pci->subsystem_vendor == cx88_subids[i].subvendor &&
		    pci->subsystem_device == cx88_subids[i].subdevice)
			core->board = cx88_subids[i].card;
	if (UNSET == core->board) {
		core->board = CX88_BOARD_UNKNOWN;
		cx88_card_list(core,pci);
	}
        printk(KERN_INFO "%s: subsystem: %04x:%04x, board: %s [card=%d,%s]\n",
	       core->name,pci->subsystem_vendor,
	       pci->subsystem_device,cx88_boards[core->board].name,
	       core->board, card[core->nr] == core->board ?
	       "insmod option" : "autodetected");

	core->tuner_type = tuner[core->nr];
	if (UNSET == core->tuner_type)
		core->tuner_type = cx88_boards[core->board].tuner_type;
	core->tda9887_conf = cx88_boards[core->board].tda9887_conf;

	/* init hardware */
	cx88_reset(core);
	cx88_i2c_init(core,pci);
	cx88_card_setup(core);
	cx88_ir_init(core,pci);

	up(&devlist);
	return core;

fail_free:
	kfree(core);
fail_unlock:
	up(&devlist);
	return NULL;
}

void cx88_core_put(struct cx88_core *core, struct pci_dev *pci)
{
	release_mem_region(pci_resource_start(pci,0),
			   pci_resource_len(pci,0));

	if (!atomic_dec_and_test(&core->refcount))
		return;

	down(&devlist);
	cx88_ir_fini(core);
	if (0 == core->i2c_rc)
		i2c_bit_del_bus(&core->i2c_adap);
	list_del(&core->devlist);
	iounmap(core->lmmio);
	cx88_devcount--;
	up(&devlist);
	kfree(core);
}

/* ------------------------------------------------------------------ */

EXPORT_SYMBOL(cx88_print_ioctl);
EXPORT_SYMBOL(cx88_pci_irqs);
EXPORT_SYMBOL(cx88_vid_irqs);
EXPORT_SYMBOL(cx88_mpeg_irqs);
EXPORT_SYMBOL(cx88_print_irqbits);

EXPORT_SYMBOL(cx88_core_irq);
EXPORT_SYMBOL(cx88_wakeup);
EXPORT_SYMBOL(cx88_reset);
EXPORT_SYMBOL(cx88_shutdown);

EXPORT_SYMBOL(cx88_risc_buffer);
EXPORT_SYMBOL(cx88_risc_databuffer);
EXPORT_SYMBOL(cx88_risc_stopper);
EXPORT_SYMBOL(cx88_free_buffer);

EXPORT_SYMBOL(cx88_sram_channels);
EXPORT_SYMBOL(cx88_sram_channel_setup);
EXPORT_SYMBOL(cx88_sram_channel_dump);

EXPORT_SYMBOL(cx88_set_tvnorm);
EXPORT_SYMBOL(cx88_set_scale);

EXPORT_SYMBOL(cx88_vdev_init);
EXPORT_SYMBOL(cx88_core_get);
EXPORT_SYMBOL(cx88_core_put);

/*
 * Local variables:
 * c-basic-offset: 8
 * End:
 */