buz.c

讲述linux的初始化过程

	return btread(ZR36057_POR) & 0xFF;
}

static int zr36060_write_8(struct zoran *zr, unsigned reg, unsigned val)
{
	if (post_office_wait(zr)
	    || post_office_write(zr, 0, 1, reg >> 8)
	    || post_office_write(zr, 0, 2, reg)) {
		return -1;
	}
	return post_office_write(zr, 0, 3, val);
}

static int zr36060_write_16(struct zoran *zr, unsigned reg, unsigned val)
{
	if (zr36060_write_8(zr, reg + 0, val >> 8)) {
		return -1;
	}
	return zr36060_write_8(zr, reg + 1, val >> 0);
}

static int zr36060_write_24(struct zoran *zr, unsigned reg, unsigned val)
{
	if (zr36060_write_8(zr, reg + 0, val >> 16)) {
		return -1;
	}
	return zr36060_write_16(zr, reg + 1, val >> 0);
}

static int zr36060_write_32(struct zoran *zr, unsigned reg, unsigned val)
{
	if (zr36060_write_16(zr, reg + 0, val >> 16)) {
		return -1;
	}
	return zr36060_write_16(zr, reg + 2, val >> 0);
}

static u32 zr36060_read_8(struct zoran *zr, unsigned reg)
{
	if (post_office_wait(zr)
	    || post_office_write(zr, 0, 1, reg >> 8)
	    || post_office_write(zr, 0, 2, reg)) {
		return -1;
	}
	return post_office_read(zr, 0, 3) & 0xFF;
}

static int zr36060_reset(struct zoran *zr)
{
	return post_office_write(zr, 3, 0, 0);
}

static void zr36060_sleep(struct zoran *zr, int sleep)
{
	GPIO(zr, 1, !sleep);
}


static void zr36060_set_jpg(struct zoran *zr, enum zoran_codec_mode mode)
{
	struct tvnorm *tvn;
	u32 reg;
	int size;

	reg = (1 << 0)		/* CodeMstr */
	    |(0 << 2)		/* CFIS=0 */
	    |(0 << 6)		/* Endian=0 */
	    |(0 << 7);		/* Code16=0 */
	zr36060_write_8(zr, 0x002, reg);

	switch (mode) {

	case BUZ_MODE_MOTION_DECOMPRESS:
	case BUZ_MODE_STILL_DECOMPRESS:
		reg = 0x00;	/* Codec mode = decompression */
		break;

	case BUZ_MODE_MOTION_COMPRESS:
	case BUZ_MODE_STILL_COMPRESS:
	default:
		reg = 0xa4;	/* Codec mode = compression with variable scale factor */
		break;

	}
	zr36060_write_8(zr, 0x003, reg);

	reg = 0x00;		/* reserved, mbz */
	zr36060_write_8(zr, 0x004, reg);

	reg = 0xff;		/* 510 bits/block */
	zr36060_write_8(zr, 0x005, reg);

	/* JPEG markers */
	reg = (zr->params.jpeg_markers) & 0x38;	/* DRI, DQT, DHT */
	if (zr->params.COM_len)
		reg |= JPEG_MARKER_COM;
	if (zr->params.APP_len)
		reg |= JPEG_MARKER_APP;
	zr36060_write_8(zr, 0x006, reg);

	reg = (0 << 3)		/* DATERR=0 */
	    |(0 << 2)		/* END=0 */
	    |(0 << 1)		/* EOI=0 */
	    |(0 << 0);		/* EOAV=0 */
	zr36060_write_8(zr, 0x007, reg);

	/* code volume */

	/* Target field size in pixels: */
	tvn = &tvnorms[zr->params.norm];
	size = (tvn->Ha / 2) * (tvn->Wa) / (zr->params.HorDcm) / (zr->params.VerDcm);

	/* Target compressed field size in bits: */
	size = size * 16;	/* uncompressed size in bits */
	size = size * zr->params.quality / 400;	/* quality = 100 is a compression ratio 1:4 */

	/* Lower limit (arbitrary, 1 KB) */
	if (size < 8192)
		size = 8192;

	/* Upper limit: 7/8 of the code buffers */
	if (size * zr->params.field_per_buff > zr->jpg_bufsize * 7)
		size = zr->jpg_bufsize * 7 / zr->params.field_per_buff;

	reg = size;
	zr36060_write_32(zr, 0x009, reg);

	/* how do we set initial SF as a function of quality parameter? */
	reg = 0x0100;		/* SF=1.0 */
	zr36060_write_16(zr, 0x011, reg);

	reg = 0x00ffffff;	/* AF=max */
	zr36060_write_24(zr, 0x013, reg);

	reg = 0x0000;		/* test */
	zr36060_write_16(zr, 0x024, reg);
}

static void zr36060_set_video(struct zoran *zr, enum zoran_codec_mode mode)
{
	struct tvnorm *tvn;
	u32 reg;

	reg = (0 << 7)		/* Video8=0 */
	    |(0 << 6)		/* Range=0 */
	    |(0 << 3)		/* FlDet=0 */
	    |(1 << 2)		/* FlVedge=1 */
	    |(0 << 1)		/* FlExt=0 */
	    |(0 << 0);		/* SyncMstr=0 */

	/* According to ZR36067 documentation, FlDet should correspond
	   to the odd_even flag of the ZR36067 */
	if (zr->params.odd_even)
		reg |= (1 << 3);

	if (mode != BUZ_MODE_STILL_DECOMPRESS) {
		/* limit pixels to range 16..235 as per CCIR-601 */
		reg |= (1 << 6);	/* Range=1 */
	}
	zr36060_write_8(zr, 0x030, reg);

	reg = (0 << 7)		/* VCLKPol=0 */
	    |(0 << 6)		/* PValPol=0 */
	    |(1 << 5)		/* PoePol=1 */
	    |(0 << 4)		/* SImgPol=0 */
	    |(0 << 3)		/* BLPol=0 */
	    |(0 << 2)		/* FlPol=0 */
	    |(0 << 1)		/* HSPol=0, sync on falling edge */
	    |(1 << 0);		/* VSPol=1 */
	zr36060_write_8(zr, 0x031, reg);

	switch (zr->params.HorDcm) {
	default:
	case 1:
		reg = (0 << 0);
		break;		/* HScale = 0 */

	case 2:
		reg = (1 << 0);
		break;		/* HScale = 1 */

	case 4:
		reg = (2 << 0);
		break;		/* HScale = 2 */
	}
	if (zr->params.VerDcm == 2)
		reg |= (1 << 2);
	zr36060_write_8(zr, 0x032, reg);

	reg = 0x80;		/* BackY */
	zr36060_write_8(zr, 0x033, reg);

	reg = 0xe0;		/* BackU */
	zr36060_write_8(zr, 0x034, reg);

	reg = 0xe0;		/* BackV */
	zr36060_write_8(zr, 0x035, reg);

	/* sync generator */

	tvn = &tvnorms[zr->params.norm];

	reg = tvn->Ht - 1;	/* Vtotal */
	zr36060_write_16(zr, 0x036, reg);

	reg = tvn->Wt - 1;	/* Htotal */
	zr36060_write_16(zr, 0x038, reg);

	reg = 6 - 1;		/* VsyncSize */
	zr36060_write_8(zr, 0x03a, reg);

	reg = 100 - 1;		/* HsyncSize */
	zr36060_write_8(zr, 0x03b, reg);

	reg = tvn->VStart - 1;	/* BVstart */
	zr36060_write_8(zr, 0x03c, reg);

	reg += tvn->Ha / 2;	/* BVend */
	zr36060_write_16(zr, 0x03e, reg);

	reg = tvn->HStart - 1;	/* BHstart */
	zr36060_write_8(zr, 0x03d, reg);

	reg += tvn->Wa;		/* BHend */
	zr36060_write_16(zr, 0x040, reg);

	/* active area */
	reg = zr->params.img_y + tvn->VStart;	/* Vstart */
	zr36060_write_16(zr, 0x042, reg);

	reg += zr->params.img_height;	/* Vend */
	zr36060_write_16(zr, 0x044, reg);

	reg = zr->params.img_x + tvn->HStart;	/* Hstart */
	zr36060_write_16(zr, 0x046, reg);

	reg += zr->params.img_width;	/* Hend */
	zr36060_write_16(zr, 0x048, reg);

	/* subimage area */
	reg = zr->params.img_y + tvn->VStart;	/* SVstart */
	zr36060_write_16(zr, 0x04a, reg);

	reg += zr->params.img_height;	/* SVend */
	zr36060_write_16(zr, 0x04c, reg);

	reg = zr->params.img_x + tvn->HStart;	/* SHstart */
	zr36060_write_16(zr, 0x04e, reg);

	reg += zr->params.img_width;	/* SHend */
	zr36060_write_16(zr, 0x050, reg);
}

static void zr36060_set_jpg_SOF(struct zoran *zr)
{
	u32 reg;


	reg = 0xffc0;		/* SOF marker */
	zr36060_write_16(zr, 0x060, reg);

	reg = 17;		/* SOF length */
	zr36060_write_16(zr, 0x062, reg);

	reg = 8;		/* precision 8 bits */
	zr36060_write_8(zr, 0x064, reg);

	reg = zr->params.img_height / zr->params.VerDcm;	/* image height */
	zr36060_write_16(zr, 0x065, reg);

	reg = zr->params.img_width / zr->params.HorDcm;	/* image width */
	zr36060_write_16(zr, 0x067, reg);

	reg = 3;		/* 3 color components */
	zr36060_write_8(zr, 0x069, reg);

	reg = 0x002100;		/* Y component */
	zr36060_write_24(zr, 0x06a, reg);

	reg = 0x011101;		/* U component */
	zr36060_write_24(zr, 0x06d, reg);

	reg = 0x021101;		/* V component */
	zr36060_write_24(zr, 0x070, reg);
}

static void zr36060_set_jpg_SOS(struct zoran *zr)
{
	u32 reg;


	reg = 0xffda;		/* SOS marker */
	zr36060_write_16(zr, 0x07a, reg);

	reg = 12;		/* SOS length */
	zr36060_write_16(zr, 0x07c, reg);

	reg = 3;		/* 3 color components */
	zr36060_write_8(zr, 0x07e, reg);

	reg = 0x0000;		/* Y component */
	zr36060_write_16(zr, 0x07f, reg);

	reg = 0x0111;		/* U component */
	zr36060_write_16(zr, 0x081, reg);

	reg = 0x0211;		/* V component */
	zr36060_write_16(zr, 0x083, reg);

	reg = 0x003f00;		/* Start, end spectral scans */
	zr36060_write_24(zr, 0x085, reg);
}

static void zr36060_set_jpg_DRI(struct zoran *zr)
{
	u32 reg;


	reg = 0xffdd;		/* DRI marker */
	zr36060_write_16(zr, 0x0c0, reg);

	reg = 4;		/* DRI length */
	zr36060_write_16(zr, 0x0c2, reg);

	reg = 8;		/* length in MCUs */
	zr36060_write_16(zr, 0x0c4, reg);
}

static void zr36060_set_jpg_DQT(struct zoran *zr)
{
	unsigned i;
	unsigned adr;
	static const u8 dqt[] =
	{
		0xff, 0xdb,	/* DHT marker */
		0x00, 0x84,	/* DHT length */
		0x00,		/* table ID 0 */
		0x10, 0x0b, 0x0c, 0x0e, 0x0c, 0x0a, 0x10, 0x0e,
		0x0d, 0x0e, 0x12, 0x11, 0x10, 0x13, 0x18, 0x28,
		0x1a, 0x18, 0x16, 0x16, 0x18, 0x31, 0x23, 0x25,
		0x1d, 0x28, 0x3a, 0x33, 0x3d, 0x3c, 0x39, 0x33,
		0x38, 0x37, 0x40, 0x48, 0x5c, 0x4e, 0x40, 0x44,
		0x57, 0x45, 0x37, 0x38, 0x50, 0x6d, 0x51, 0x57,
		0x5f, 0x62, 0x67, 0x68, 0x67, 0x3e, 0x4d, 0x71,
		0x79, 0x70, 0x64, 0x78, 0x5c, 0x65, 0x67, 0x63,
		0x01,		/* table ID 1 */
		0x11, 0x12, 0x12, 0x18, 0x15, 0x18, 0x2f, 0x1a,
		0x1a, 0x2f, 0x63, 0x42, 0x38, 0x42, 0x63, 0x63,
		0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
		0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
		0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
		0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
		0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
		0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63
	};

	/* write fixed quantitization tables */
	adr = 0x0cc;
	for (i = 0; i < sizeof(dqt); ++i) {
		zr36060_write_8(zr, adr++, dqt[i]);
	}
}

static void zr36060_set_jpg_DHT(struct zoran *zr)
{
	unsigned i;
	unsigned adr;
	static const u8 dht[] =
	{
		0xff, 0xc4,	/* DHT marker */
		0x01, 0xa2,	/* DHT length */
		0x00,		/* table class 0, ID 0 */
		0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01, 0x01,		/* # codes of length 1..8 */
		0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,		/* # codes of length 8..16 */
		0x00,		/* values for codes of length 2 */
		0x01, 0x02, 0x03, 0x04, 0x05,	/* values for codes of length 3 */
		0x06,		/* values for codes of length 4 */
		0x07,		/* values for codes of length 5 */
		0x08,		/* values for codes of length 6 */
		0x09,		/* values for codes of length 7 */
		0x0a,		/* values for codes of length 8 */
		0x0b,		/* values for codes of length 9 */
		0x01,		/* table class 0, ID 1 */
		0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,		/* # codes of length 1..8 */
		0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,		/* # codes of length 9..16 */
		0x00, 0x01, 0x02,	/* values for codes of length 2 */
		0x03,		/* values for codes of length 3 */
		0x04,		/* values for codes of length 4 */
		0x05,		/* values for codes of length 5 */
		0x06,		/* values for codes of length 6 */
		0x07,		/* values for codes of length 7 */
		0x08,		/* values for codes of length 8 */
		0x09,		/* values for codes of length 9 */
		0x0a,		/* values for codes of length 10 */
		0x0b,		/* values for codes of length 11 */
		0x10,
		0x00, 0x02, 0x01, 0x03, 0x03, 0x02, 0x04, 0x03,
		0x05, 0x05, 0x04, 0x04, 0x00, 0x00, 0x01, 0x7d,
		0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
		0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
		0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
		0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
		0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
		0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
		0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
		0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
		0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
		0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
		0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
		0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
		0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
		0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
		0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
		0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
		0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
		0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
		0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
		0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
		0xf9, 0xfa, 0x11, 0x00, 0x02, 0x01, 0x02, 0x04,
		0x04, 0x03, 0x04, 0x07, 0x05, 0x04, 0x04, 0x00,
		0x01, 0x02, 0x77, 0x00, 0x01, 0x02, 0x03, 0x11,
		0x04, 0x05, 0x21, 0x31, 0x06, 0x12, 0x41, 0x51,
		0x07, 0x61, 0x71, 0x13, 0x22, 0x32, 0x81, 0x08,
		0x14, 0x42, 0x91, 0xa1, 0xb1, 0xc1, 0x09, 0x23,
		0x33, 0x52, 0xf0, 0x15, 0x62, 0x72, 0xd1, 0x0a,
		0x16, 0x24, 0x34, 0xe1, 0x25, 0xf1, 0x17, 0x18,
		0x19, 0x1a, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x35,
		0x36, 0x37, 0x38, 0x39, 0x3a, 0x43, 0x44, 0x45,
		0x46, 0x47, 0x48, 0x49, 0x4a, 0x53, 0x54, 0x55,
		0x56, 0x57, 0x58, 0x59, 0x5a, 0x63, 0x64, 0x65,
		0x66, 0x67, 0x68, 0x69, 0x6a, 0x73, 0x74, 0x75,
		0x76, 0x77, 0x78, 0x79, 0x7a, 0x82, 0x83, 0x84,
		0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x92, 0x93,
		0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0xa2,
		0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa,
		0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9,
		0xba, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8,
		0xc9, 0xca, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
		0xd8, 0xd9, 0xda, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6,
		0xe7, 0xe8, 0xe9, 0xea, 0xf2, 0xf3, 0xf4, 0xf5,
		0xf6, 0xf7, 0xf8, 0xf9, 0xfa
	};

	/* write fixed Huffman tables */
	adr = 0x1d4;
	for (i = 0; i < sizeof(dht); ++i) {
		zr36060_write_8(zr, adr++, dht[i]);
	}
}

static void zr36060_set_jpg_APP(struct zoran *zr)
{
	unsigned adr;
	int len, i;
	u32 reg;


	len = zr->params.APP_len;
	if (len < 0)
		len = 0;
	if (len > 60)
		len = 60;

	i = zr->params.APPn;
	if (i < 0)
		i = 0;
	if (i > 15)
		i = 15;

	reg = 0xffe0 + i;	/* APPn marker */
	zr36060_write_16(zr, 0x380, reg);

	reg = len + 2;		/* APPn len */
	zr36060_write_16(zr, 0x382, reg);

	/* write APPn data */
	adr = 0x384;
	for (i = 0; i < 60; i++) {
		zr36060_write_8(zr, adr++, (i < len ? zr->params.APP_data[i] : 0));
	}
}

static void zr36060_set_jpg_COM(struct zoran *zr)
{
	unsigned adr;
	int len, i;
	u32 reg;


	len = zr->params.COM_len;
	if (len < 0)
		len = 0;
	if (len > 60)
		len = 60;

	reg = 0xfffe;		/* COM marker */
	zr36060_write_16(zr, 0x3c0, reg);

	reg = len + 2;		/* COM len */
	zr36060_write_16(zr, 0x3c2, reg);

	/* write COM data */
	adr = 0x3c4;
	for (i = 0; i < 60; i++) {
		zr36060_write_8(zr, adr++, (i < len ? zr->params.COM_data[i] : 0));
	}
}

static void zr36060_set_cap(struct zoran *zr, enum zoran_codec_mode mode)
{
	unsigned i;