// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Zoran ZR36050 basic configuration functions
 *
 * Copyright (C) 2001 Wolfgang Scherr <scherr@net4you.at>
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/delay.h>

#include <linux/types.h>
#include <linux/wait.h>

/* I/O commands, error codes */
#include <linux/io.h>

/* headerfile of this module */
#include "zr36050.h"

/* codec io API */
#include "videocodec.h"

/* it doesn't make sense to have more than 20 or so,
  just to prevent some unwanted loops */
#define MAX_CODECS 20

/* amount of chips attached via this driver */
static int zr36050_codecs;

/* =========================================================================
   Local hardware I/O functions:

   read/write via codec layer (registers are located in the master device)
   ========================================================================= */

/* read and write functions */
static u8 zr36050_read(struct zr36050 *ptr, u16 reg)
{
	struct zoran *zr = videocodec_to_zoran(ptr->codec);
	u8 value = 0;

	/* just in case something is wrong... */
	if (ptr->codec->master_data->readreg)
		value = (ptr->codec->master_data->readreg(ptr->codec, reg)) & 0xFF;
	else
		zrdev_err(zr, "%s: invalid I/O setup, nothing read!\n", ptr->name);

	zrdev_dbg(zr, "%s: reading from 0x%04x: %02x\n", ptr->name, reg, value);

	return value;
}

static void zr36050_write(struct zr36050 *ptr, u16 reg, u8 value)
{
	struct zoran *zr = videocodec_to_zoran(ptr->codec);

	zrdev_dbg(zr, "%s: writing 0x%02x to 0x%04x\n", ptr->name, value, reg);

	/* just in case something is wrong... */
	if (ptr->codec->master_data->writereg)
		ptr->codec->master_data->writereg(ptr->codec, reg, value);
	else
		zrdev_err(zr, "%s: invalid I/O setup, nothing written!\n",
			  ptr->name);
}

/* =========================================================================
   Local helper function:

   status read
   ========================================================================= */

/* status is kept in datastructure */
static u8 zr36050_read_status1(struct zr36050 *ptr)
{
	ptr->status1 = zr36050_read(ptr, ZR050_STATUS_1);

	zr36050_read(ptr, 0);
	return ptr->status1;
}

/* =========================================================================
   Local helper function:

   scale factor read
   ========================================================================= */

/* scale factor is kept in datastructure */
static u16 zr36050_read_scalefactor(struct zr36050 *ptr)
{
	ptr->scalefact = (zr36050_read(ptr, ZR050_SF_HI) << 8) |
			 (zr36050_read(ptr, ZR050_SF_LO) & 0xFF);

	/* leave 0 selected for an eventually GO from master */
	zr36050_read(ptr, 0);
	return ptr->scalefact;
}

/* =========================================================================
   Local helper function:

   wait if codec is ready to proceed (end of processing) or time is over
   ========================================================================= */

static void zr36050_wait_end(struct zr36050 *ptr)
{
	struct zoran *zr = videocodec_to_zoran(ptr->codec);
	int i = 0;

	while (!(zr36050_read_status1(ptr) & 0x4)) {
		udelay(1);
		if (i++ > 200000) {	// 200ms, there is for sure something wrong!!!
			zrdev_err(zr,
				  "%s: timeout at wait_end (last status: 0x%02x)\n",
				  ptr->name, ptr->status1);
			break;
		}
	}
}

/* =========================================================================
   Local helper function:

   basic test of "connectivity", writes/reads to/from memory the SOF marker
   ========================================================================= */

static int zr36050_basic_test(struct zr36050 *ptr)
{
	struct zoran *zr = videocodec_to_zoran(ptr->codec);

	zr36050_write(ptr, ZR050_SOF_IDX, 0x00);
	zr36050_write(ptr, ZR050_SOF_IDX + 1, 0x00);
	if ((zr36050_read(ptr, ZR050_SOF_IDX) |
	     zr36050_read(ptr, ZR050_SOF_IDX + 1)) != 0x0000) {
		zrdev_err(zr,
			  "%s: attach failed, can't connect to jpeg processor!\n",
			  ptr->name);
		return -ENXIO;
	}
	zr36050_write(ptr, ZR050_SOF_IDX, 0xff);
	zr36050_write(ptr, ZR050_SOF_IDX + 1, 0xc0);
	if (((zr36050_read(ptr, ZR050_SOF_IDX) << 8) |
	     zr36050_read(ptr, ZR050_SOF_IDX + 1)) != 0xffc0) {
		zrdev_err(zr,
			  "%s: attach failed, can't connect to jpeg processor!\n",
			  ptr->name);
		return -ENXIO;
	}

	zr36050_wait_end(ptr);
	if ((ptr->status1 & 0x4) == 0) {
		zrdev_err(zr,
			  "%s: attach failed, jpeg processor failed (end flag)!\n",
			  ptr->name);
		return -EBUSY;
	}

	return 0;		/* looks good! */
}

/* =========================================================================
   Local helper function:

   simple loop for pushing the init datasets
   ========================================================================= */

static int zr36050_pushit(struct zr36050 *ptr, u16 startreg, u16 len, const char *data)
{
	struct zoran *zr = videocodec_to_zoran(ptr->codec);
	int i = 0;

	zrdev_dbg(zr, "%s: write data block to 0x%04x (len=%d)\n", ptr->name,
		  startreg, len);
	while (i < len)
		zr36050_write(ptr, startreg++, data[i++]);

	return i;
}

/* =========================================================================
   Basic datasets:

   jpeg baseline setup data (you find it on lots places in internet, or just
   extract it from any regular .jpg image...)

   Could be variable, but until it's not needed it they are just fixed to save
   memory. Otherwise expand zr36050 structure with arrays, push the values to
   it and initialize from there, as e.g. the linux zr36057/60 driver does it.
   ========================================================================= */

static const char zr36050_dqt[0x86] = {
	0xff, 0xdb,		//Marker: DQT
	0x00, 0x84,		//Length: 2*65+2
	0x00,			//Pq,Tq first table
	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,			//Pq,Tq second table
	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
};

static const char zr36050_dht[0x1a4] = {
	0xff, 0xc4,		//Marker: DHT
	0x01, 0xa2,		//Length: 2*AC, 2*DC
	0x00,			//DC first table
	0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01, 0x01,
	0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
	0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B,
	0x01,			//DC second table
	0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
	0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
	0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B,
	0x10,			//AC first table
	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,			//AC second table
	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
};

/* jpeg baseline setup, this is just fixed in this driver (YUV pictures) */
#define NO_OF_COMPONENTS          0x3	//Y,U,V
#define BASELINE_PRECISION        0x8	//MCU size (?)
static const char zr36050_tq[8] = { 0, 1, 1, 0, 0, 0, 0, 0 };	//table idx's QT
static const char zr36050_td[8] = { 0, 1, 1, 0, 0, 0, 0, 0 };	//table idx's DC
static const char zr36050_ta[8] = { 0, 1, 1, 0, 0, 0, 0, 0 };	//table idx's AC

/* horizontal 422 decimation setup (maybe we support 411 or so later, too) */
static const char zr36050_decimation_h[8] = { 2, 1, 1, 0, 0, 0, 0, 0 };
static const char zr36050_decimation_v[8] = { 1, 1, 1, 0, 0, 0, 0, 0 };

/* =========================================================================
   Local helper functions:

   calculation and setup of parameter-dependent JPEG baseline segments
   (needed for compression only)
   ========================================================================= */

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

/* SOF (start of frame) segment depends on width, height and sampling ratio
			 of each color component */

static int zr36050_set_sof(struct zr36050 *ptr)
{
	struct zoran *zr = videocodec_to_zoran(ptr->codec);
	char sof_data[34];	// max. size of register set
	int i;

	zrdev_dbg(zr, "%s: write SOF (%dx%d, %d components)\n", ptr->name,
		  ptr->width, ptr->height, NO_OF_COMPONENTS);
	sof_data[0] = 0xff;
	sof_data[1] = 0xc0;
	sof_data[2] = 0x00;
	sof_data[3] = (3 * NO_OF_COMPONENTS) + 8;
	sof_data[4] = BASELINE_PRECISION;	// only '8' possible with zr36050
	sof_data[5] = (ptr->height) >> 8;
	sof_data[6] = (ptr->height) & 0xff;
	sof_data[7] = (ptr->width) >> 8;
	sof_data[8] = (ptr->width) & 0xff;
	sof_data[9] = NO_OF_COMPONENTS;
	for (i = 0; i < NO_OF_COMPONENTS; i++) {
		sof_data[10 + (i * 3)] = i;	// index identifier
		sof_data[11 + (i * 3)] = (ptr->h_samp_ratio[i] << 4) | (ptr->v_samp_ratio[i]);	// sampling ratios
		sof_data[12 + (i * 3)] = zr36050_tq[i];	// Q table selection
	}
	return zr36050_pushit(ptr, ZR050_SOF_IDX,
			      (3 * NO_OF_COMPONENTS) + 10, sof_data);
}

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

/* SOS (start of scan) segment depends on the used scan components
			of each color component */

static int zr36050_set_sos(struct zr36050 *ptr)
{
	struct zoran *zr = videocodec_to_zoran(ptr->codec);
	char sos_data[16];	// max. size of register set
	int i;

	zrdev_dbg(zr, "%s: write SOS\n", ptr->name);
	sos_data[0] = 0xff;
	sos_data[1] = 0xda;
	sos_data[2] = 0x00;
	sos_data[3] = 2 + 1 + (2 * NO_OF_COMPONENTS) + 3;
	sos_data[4] = NO_OF_COMPONENTS;
	for (i = 0; i < NO_OF_COMPONENTS; i++) {
		sos_data[5 + (i * 2)] = i;	// index
		sos_data[6 + (i * 2)] = (zr36050_td[i] << 4) | zr36050_ta[i];	// AC/DC tbl.sel.
	}
	sos_data[2 + 1 + (2 * NO_OF_COMPONENTS) + 2] = 00;	// scan start
	sos_data[2 + 1 + (2 * NO_OF_COMPONENTS) + 3] = 0x3F;
	sos_data[2 + 1 + (2 * NO_OF_COMPONENTS) + 4] = 00;
	return zr36050_pushit(ptr, ZR050_SOS1_IDX,
			      4 + 1 + (2 * NO_OF_COMPONENTS) + 3,
			      sos_data);
}

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

/* DRI (define restart interval) */

static int zr36050_set_dri(struct zr36050 *ptr)
{
	struct zoran *zr = videocodec_to_zoran(ptr->codec);
	char dri_data[6];	// max. size of register set

	zrdev_dbg(zr, "%s: write DRI\n", ptr->name);
	dri_data[0] = 0xff;
	dri_data[1] = 0xdd;
	dri_data[2] = 0x00;
	dri_data[3] = 0x04;
	dri_data[4] = ptr->dri >> 8;
	dri_data[5] = ptr->dri & 0xff;
	return zr36050_pushit(ptr, ZR050_DRI_IDX, 6, dri_data);
}

/* =========================================================================
   Setup function:

   Setup compression/decompression of Zoran's JPEG processor
   ( see also zoran 36050 manual )

   ... sorry for the spaghetti code ...
   ========================================================================= */
static void zr36050_init(struct zr36050 *ptr)
{
	int sum = 0;
	long bitcnt, tmp;
	struct zoran *zr = videocodec_to_zoran(ptr->codec);

	if (ptr->mode == CODEC_DO_COMPRESSION) {
		zrdev_dbg(zr, "%s: COMPRESSION SETUP\n", ptr->name);

		/* 050 communicates with 057 in master mode */
		zr36050_write(ptr, ZR050_HARDWARE, ZR050_HW_MSTR);

		/* encoding table preload for compression */
		zr36050_write(ptr, ZR050_MODE,
			      ZR050_MO_COMP | ZR050_MO_TLM);
		zr36050_write(ptr, ZR050_OPTIONS, 0);

		/* disable all IRQs */
		zr36050_write(ptr, ZR050_INT_REQ_0, 0);
		zr36050_write(ptr, ZR050_INT_REQ_1, 3);	// low 2 bits always 1

		/* volume control settings */
		/*zr36050_write(ptr, ZR050_MBCV, ptr->max_block_vol);*/
		zr36050_write(ptr, ZR050_SF_HI, ptr->scalefact >> 8);
		zr36050_write(ptr, ZR050_SF_LO, ptr->scalefact & 0xff);

		zr36050_write(ptr, ZR050_AF_HI, 0xff);
		zr36050_write(ptr, ZR050_AF_M, 0xff);
		zr36050_write(ptr, ZR050_AF_LO, 0xff);

		/* setup the variable jpeg tables */
		sum += zr36050_set_sof(ptr);
		sum += zr36050_set_sos(ptr);
		sum += zr36050_set_dri(ptr);

		/* setup the fixed jpeg tables - maybe variable, though -
		 * (see table init section above) */
		zrdev_dbg(zr, "%s: write DQT, DHT, APP\n", ptr->name);
		sum += zr36050_pushit(ptr, ZR050_DQT_IDX,
				      sizeof(zr36050_dqt), zr36050_dqt);
		sum += zr36050_pushit(ptr, ZR050_DHT_IDX,
				      sizeof(zr36050_dht), zr36050_dht);
		zr36050_write(ptr, ZR050_APP_IDX, 0xff);
		zr36050_write(ptr, ZR050_APP_IDX + 1, 0xe0 + ptr->app.appn);
		zr36050_write(ptr, ZR050_APP_IDX + 2, 0x00);
		zr36050_write(ptr, ZR050_APP_IDX + 3, ptr->app.len + 2);
		sum += zr36050_pushit(ptr, ZR050_APP_IDX + 4, 60,
				      ptr->app.data) + 4;
		zr36050_write(ptr, ZR050_COM_IDX, 0xff);
		zr36050_write(ptr, ZR050_COM_IDX + 1, 0xfe);
		zr36050_write(ptr, ZR050_COM_IDX + 2, 0x00);
		zr36050_write(ptr, ZR050_COM_IDX + 3, ptr->com.len + 2);
		sum += zr36050_pushit(ptr, ZR050_COM_IDX + 4, 60,
				      ptr->com.data) + 4;

		/* do the internal huffman table preload */
		zr36050_write(ptr, ZR050_MARKERS_EN, ZR050_ME_DHTI);

		zr36050_write(ptr, ZR050_GO, 1);	// launch codec
		zr36050_wait_end(ptr);
		zrdev_dbg(zr, "%s: Status after table preload: 0x%02x\n",
			  ptr->name, ptr->status1);

		if ((ptr->status1 & 0x4) == 0) {
			zrdev_err(zr, "%s: init aborted!\n", ptr->name);
			return;	// something is wrong, its timed out!!!!
		}

		/* setup misc. data for compression (target code sizes) */

		/* size of compressed code to reach without header data */
		sum = ptr->real_code_vol - sum;
		bitcnt = sum << 3;	/* need the size in bits */

		tmp = bitcnt >> 16;
		zrdev_dbg(zr,
			  "%s: code: csize=%d, tot=%d, bit=%ld, highbits=%ld\n",
			  ptr->name, sum, ptr->real_code_vol, bitcnt, tmp);
		zr36050_write(ptr, ZR050_TCV_NET_HI, tmp >> 8);
		zr36050_write(ptr, ZR050_TCV_NET_MH, tmp & 0xff);
		tmp = bitcnt & 0xffff;
		zr36050_write(ptr, ZR050_TCV_NET_ML, tmp >> 8);
		zr36050_write(ptr, ZR050_TCV_NET_LO, tmp & 0xff);

		bitcnt -= bitcnt >> 7;	// bits without stuffing
		bitcnt -= ((bitcnt * 5) >> 6);	// bits without eob

		tmp = bitcnt >> 16;
		zrdev_dbg(zr, "%s: code: nettobit=%ld, highnettobits=%ld\n",
			  ptr->name, bitcnt, tmp);
		zr36050_write(ptr, ZR050_TCV_DATA_HI, tmp >> 8);
		zr36050_write(ptr, ZR050_TCV_DATA_MH, tmp & 0xff);
		tmp = bitcnt & 0xffff;
		zr36050_write(ptr, ZR050_TCV_DATA_ML, tmp >> 8);
		zr36050_write(ptr, ZR050_TCV_DATA_LO, tmp & 0xff);

		/* compression setup with or without bitrate control */
		zr36050_write(ptr, ZR050_MODE,
			      ZR050_MO_COMP | ZR050_MO_PASS2 |
			      (ptr->bitrate_ctrl ? ZR050_MO_BRC : 0));

		/* this headers seem to deliver "valid AVI" jpeg frames */
		zr36050_write(ptr, ZR050_MARKERS_EN,
			      ZR050_ME_DQT | ZR050_ME_DHT |
			      ((ptr->app.len > 0) ? ZR050_ME_APP : 0) |
			      ((ptr->com.len > 0) ? ZR050_ME_COM : 0));
	} else {
		zrdev_dbg(zr, "%s: EXPANSION SETUP\n", ptr->name);

		/* 050 communicates with 055 in master mode */
		zr36050_write(ptr, ZR050_HARDWARE,
			      ZR050_HW_MSTR | ZR050_HW_CFIS_2_CLK);

		/* encoding table preload */
		zr36050_write(ptr, ZR050_MODE, ZR050_MO_TLM);

		/* disable all IRQs */
		zr36050_write(ptr, ZR050_INT_REQ_0, 0);
		zr36050_write(ptr, ZR050_INT_REQ_1, 3);	// low 2 bits always 1

		zrdev_dbg(zr, "%s: write DHT\n", ptr->name);
		zr36050_pushit(ptr, ZR050_DHT_IDX, sizeof(zr36050_dht),
			       zr36050_dht);

		/* do the internal huffman table preload */
		zr36050_write(ptr, ZR050_MARKERS_EN, ZR050_ME_DHTI);

		zr36050_write(ptr, ZR050_GO, 1);	// launch codec
		zr36050_wait_end(ptr);
		zrdev_dbg(zr, "%s: Status after table preload: 0x%02x\n",
			  ptr->name, ptr->status1);

		if ((ptr->status1 & 0x4) == 0) {
			zrdev_err(zr, "%s: init aborted!\n", ptr->name);
			return;	// something is wrong, its timed out!!!!
		}

		/* setup misc. data for expansion */
		zr36050_write(ptr, ZR050_MODE, 0);
		zr36050_write(ptr, ZR050_MARKERS_EN, 0);
	}

	/* adr on selected, to allow GO from master */
	zr36050_read(ptr, 0);
}

/* =========================================================================
   CODEC API FUNCTIONS

   this functions are accessed by the master via the API structure
   ========================================================================= */

/* set compression/expansion mode and launches codec -
   this should be the last call from the master before starting processing */
static int zr36050_set_mode(struct videocodec *codec, int mode)
{
	struct zr36050 *ptr = (struct zr36050 *)codec->data;
	struct zoran *zr = videocodec_to_zoran(codec);

	zrdev_dbg(zr, "%s: set_mode %d call\n", ptr->name, mode);

	if ((mode != CODEC_DO_EXPANSION) && (mode != CODEC_DO_COMPRESSION))
		return -EINVAL;

	ptr->mode = mode;
	zr36050_init(ptr);

	return 0;
}

/* set picture size (norm is ignored as the codec doesn't know about it) */
static int zr36050_set_video(struct videocodec *codec, const struct tvnorm *norm,
			     struct vfe_settings *cap, struct vfe_polarity *pol)
{
	struct zr36050 *ptr = (struct zr36050 *)codec->data;
	struct zoran *zr = videocodec_to_zoran(codec);
	int size;

	zrdev_dbg(zr, "%s: set_video %d.%d, %d/%d-%dx%d (0x%x) q%d call\n",
		  ptr->name, norm->h_start, norm->v_start,
		  cap->x, cap->y, cap->width, cap->height,
		  cap->decimation, cap->quality);
	/* if () return -EINVAL;
	 * trust the master driver that it knows what it does - so
	 * we allow invalid startx/y and norm for now ... */
	ptr->width = cap->width / (cap->decimation & 0xff);
	ptr->height = cap->height / ((cap->decimation >> 8) & 0xff);

	/* (KM) JPEG quality */
	size = ptr->width * ptr->height;
	size *= 16; /* size in bits */
	/* apply quality setting */
	size = size * cap->quality / 200;

	/* Minimum: 1kb */
	if (size < 8192)
		size = 8192;
	/* Maximum: 7/8 of code buffer */
	if (size > ptr->total_code_vol * 7)
		size = ptr->total_code_vol * 7;

	ptr->real_code_vol = size >> 3; /* in bytes */

	/* Set max_block_vol here (previously in zr36050_init, moved
 * here for consistency with zr36060 code */
	zr36050_write(ptr, ZR050_MBCV, ptr->max_block_vol);

	return 0;
}

/* additional control functions */
static int zr36050_control(struct videocodec *codec, int type, int size, void *data)
{
	struct zr36050 *ptr = (struct zr36050 *)codec->data;
	struct zoran *zr = videocodec_to_zoran(codec);
	int *ival = (int *)data;

	zrdev_dbg(zr, "%s: control %d call with %d byte\n", ptr->name, type,
		  size);

	switch (type) {
	case CODEC_G_STATUS:	/* get last status */
		if (size != sizeof(int))
			return -EFAULT;
		zr36050_read_status1(ptr);
		*ival = ptr->status1;
		break;

	case CODEC_G_CODEC_MODE:
		if (size != sizeof(int))
			return -EFAULT;
		*ival = CODEC_MODE_BJPG;
		break;

	case CODEC_S_CODEC_MODE:
		if (size != sizeof(int))
			return -EFAULT;
		if (*ival != CODEC_MODE_BJPG)
			return -EINVAL;
		/* not needed, do nothing */
		return 0;

	case CODEC_G_VFE:
	case CODEC_S_VFE:
		/* not needed, do nothing */
		return 0;

	case CODEC_S_MMAP:
		/* not available, give an error */
		return -ENXIO;

	case CODEC_G_JPEG_TDS_BYTE:	/* get target volume in byte */
		if (size != sizeof(int))
			return -EFAULT;
		*ival = ptr->total_code_vol;
		break;

	case CODEC_S_JPEG_TDS_BYTE:	/* get target volume in byte */
		if (size != sizeof(int))
			return -EFAULT;
		ptr->total_code_vol = *ival;
		/* (Kieran Morrissey)
		 * code copied from zr36060.c to ensure proper bitrate */
		ptr->real_code_vol = (ptr->total_code_vol * 6) >> 3;
		break;

	case CODEC_G_JPEG_SCALE:	/* get scaling factor */
		if (size != sizeof(int))
			return -EFAULT;
		*ival = zr36050_read_scalefactor(ptr);
		break;

	case CODEC_S_JPEG_SCALE:	/* set scaling factor */
		if (size != sizeof(int))
			return -EFAULT;
		ptr->scalefact = *ival;
		break;

	case CODEC_G_JPEG_APP_DATA: {	/* get appn marker data */
		struct jpeg_app_marker *app = data;

		if (size != sizeof(struct jpeg_app_marker))
			return -EFAULT;

		*app = ptr->app;
		break;
	}

	case CODEC_S_JPEG_APP_DATA: {	 /* set appn marker data */
		struct jpeg_app_marker *app = data;

		if (size != sizeof(struct jpeg_app_marker))
			return -EFAULT;

		ptr->app = *app;
		break;
	}

	case CODEC_G_JPEG_COM_DATA: {	/* get comment marker data */
		struct jpeg_com_marker *com = data;

		if (size != sizeof(struct jpeg_com_marker))
			return -EFAULT;

		*com = ptr->com;
		break;
	}

	case CODEC_S_JPEG_COM_DATA: {	/* set comment marker data */
		struct jpeg_com_marker *com = data;

		if (size != sizeof(struct jpeg_com_marker))
			return -EFAULT;

		ptr->com = *com;
		break;
	}

	default:
		return -EINVAL;
	}

	return size;
}

/* =========================================================================
   Exit and unregister function:

   Deinitializes Zoran's JPEG processor
   ========================================================================= */

static int zr36050_unset(struct videocodec *codec)
{
	struct zr36050 *ptr = codec->data;
	struct zoran *zr = videocodec_to_zoran(codec);

	if (ptr) {
		/* do wee need some codec deinit here, too ???? */

		zrdev_dbg(zr, "%s: finished codec #%d\n", ptr->name,
			  ptr->num);
		kfree(ptr);
		codec->data = NULL;

		zr36050_codecs--;
		return 0;
	}

	return -EFAULT;
}

/* =========================================================================
   Setup and registry function:

   Initializes Zoran's JPEG processor

   Also sets pixel size, average code size, mode (compr./decompr.)
   (the given size is determined by the processor with the video interface)
   ========================================================================= */

static int zr36050_setup(struct videocodec *codec)
{
	struct zr36050 *ptr;
	struct zoran *zr = videocodec_to_zoran(codec);
	int res;

	zrdev_dbg(zr, "zr36050: initializing MJPEG subsystem #%d.\n",
		  zr36050_codecs);

	if (zr36050_codecs == MAX_CODECS) {
		zrdev_err(zr,
			  "zr36050: Can't attach more codecs!\n");
		return -ENOSPC;
	}
	//mem structure init
	ptr = kzalloc(sizeof(*ptr), GFP_KERNEL);
	codec->data = ptr;
	if (!ptr)
		return -ENOMEM;

	snprintf(ptr->name, sizeof(ptr->name), "zr36050[%d]",
		 zr36050_codecs);
	ptr->num = zr36050_codecs++;
	ptr->codec = codec;

	//testing
	res = zr36050_basic_test(ptr);
	if (res < 0) {
		zr36050_unset(codec);
		return res;
	}
	//final setup
	memcpy(ptr->h_samp_ratio, zr36050_decimation_h, 8);
	memcpy(ptr->v_samp_ratio, zr36050_decimation_v, 8);

	ptr->bitrate_ctrl = 0;	/* 0 or 1 - fixed file size flag
				 * (what is the difference?) */
	ptr->mode = CODEC_DO_COMPRESSION;
	ptr->width = 384;
	ptr->height = 288;
	ptr->total_code_vol = 16000;
	ptr->max_block_vol = 240;
	ptr->scalefact = 0x100;
	ptr->dri = 1;

	/* no app/com marker by default */
	ptr->app.appn = 0;
	ptr->app.len = 0;
	ptr->com.len = 0;

	zr36050_init(ptr);

	zrdev_info(zr, "%s: codec attached and running\n",
		   ptr->name);

	return 0;
}

static const struct videocodec zr36050_codec = {
	.name = "zr36050",
	.magic = 0L,		// magic not used
	.flags =
	    CODEC_FLAG_JPEG | CODEC_FLAG_HARDWARE | CODEC_FLAG_ENCODER |
	    CODEC_FLAG_DECODER,
	.type = CODEC_TYPE_ZR36050,
	.setup = zr36050_setup,	// functionality
	.unset = zr36050_unset,
	.set_mode = zr36050_set_mode,
	.set_video = zr36050_set_video,
	.control = zr36050_control,
	// others are not used
};

/* =========================================================================
   HOOK IN DRIVER AS KERNEL MODULE
   ========================================================================= */

int zr36050_init_module(void)
{
	zr36050_codecs = 0;
	return videocodec_register(&zr36050_codec);
}

void zr36050_cleanup_module(void)
{
	if (zr36050_codecs) {
		pr_debug("zr36050: something's wrong - %d codecs left somehow.\n",
			 zr36050_codecs);
	}
	videocodec_unregister(&zr36050_codec);
}