/*
 * Earthsoft PT3 driver
 *
 * Copyright (C) 2014 Akihiro Tsukada <tskd08@gmail.com>
 *
 * 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 version 2.
 *
 *
 * 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.
 */

#ifndef PT3_H
#define PT3_H

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

#include "dvb_demux.h"
#include "dvb_frontend.h"
#include "dmxdev.h"

#include "tc90522.h"
#include "mxl301rf.h"
#include "qm1d1c0042.h"

#define DRV_NAME KBUILD_MODNAME

#define PT3_NUM_FE 4

/*
 * register index of the FPGA chip
 */
#define REG_VERSION	0x00
#define REG_BUS		0x04
#define REG_SYSTEM_W	0x08
#define REG_SYSTEM_R	0x0c
#define REG_I2C_W	0x10
#define REG_I2C_R	0x14
#define REG_RAM_W	0x18
#define REG_RAM_R	0x1c
#define REG_DMA_BASE	0x40	/* regs for FE[i] = REG_DMA_BASE + 0x18 * i */
#define OFST_DMA_DESC_L	0x00
#define OFST_DMA_DESC_H	0x04
#define OFST_DMA_CTL	0x08
#define OFST_TS_CTL	0x0c
#define OFST_STATUS	0x10
#define OFST_TS_ERR	0x14

/*
 * internal buffer for I2C
 */
#define PT3_I2C_MAX 4091
struct pt3_i2cbuf {
	u8  data[PT3_I2C_MAX];
	u8  tmp;
	u32 num_cmds;
};

/*
 * DMA things
 */
#define TS_PACKET_SZ  188
/* DMA transfers must not cross 4GiB, so use one page / transfer */
#define DATA_XFER_SZ   4096
#define DATA_BUF_XFERS 47
/* (num_bufs * DATA_BUF_SZ) % TS_PACKET_SZ must be 0 */
#define DATA_BUF_SZ    (DATA_BUF_XFERS * DATA_XFER_SZ)
#define MAX_DATA_BUFS  16
#define MIN_DATA_BUFS   2

#define DESCS_IN_PAGE (PAGE_SIZE / sizeof(struct xfer_desc))
#define MAX_NUM_XFERS (MAX_DATA_BUFS * DATA_BUF_XFERS)
#define MAX_DESC_BUFS DIV_ROUND_UP(MAX_NUM_XFERS, DESCS_IN_PAGE)

/* DMA transfer description.
 * device is passed a pointer to this struct, dma-reads it,
 * and gets the DMA buffer ring for storing TS data.
 */
struct xfer_desc {
	u32 addr_l; /* bus address of target data buffer */
	u32 addr_h;
	u32 size;
	u32 next_l; /* bus adddress of the next xfer_desc */
	u32 next_h;
};

/* A DMA mapping of a page containing xfer_desc's */
struct xfer_desc_buffer {
	dma_addr_t b_addr;
	struct xfer_desc *descs; /* PAGE_SIZE (xfer_desc[DESCS_IN_PAGE]) */
};

/* A DMA mapping of a data buffer */
struct dma_data_buffer {
	dma_addr_t b_addr;
	u8 *data; /* size: u8[PAGE_SIZE] */
};

/*
 * device things
 */
struct pt3_adap_config {
	struct i2c_board_info demod_info;
	struct tc90522_config demod_cfg;

	struct i2c_board_info tuner_info;
	union tuner_config {
		struct qm1d1c0042_config qm1d1c0042;
		struct mxl301rf_config   mxl301rf;
	} tuner_cfg;
	u32 init_freq;
};

struct pt3_adapter {
	struct dvb_adapter  dvb_adap;  /* dvb_adap.priv => struct pt3_board */
	int adap_idx;

	struct dvb_demux    demux;
	struct dmxdev       dmxdev;
	struct dvb_frontend *fe;
	struct i2c_client   *i2c_demod;
	struct i2c_client   *i2c_tuner;

	/* data fetch thread */
	struct task_struct *thread;
	int num_feeds;

	bool cur_lna;
	bool cur_lnb; /* current LNB power status (on/off) */

	/* items below are for DMA */
	struct dma_data_buffer buffer[MAX_DATA_BUFS];
	int buf_idx;
	int buf_ofs;
	int num_bufs;  /* == pt3_board->num_bufs */
	int num_discard; /* how many access units to discard initially */

	struct xfer_desc_buffer desc_buf[MAX_DESC_BUFS];
	int num_desc_bufs;  /* == num_bufs * DATA_BUF_XFERS / DESCS_IN_PAGE */
};


struct pt3_board {
	struct pci_dev *pdev;
	void __iomem *regs[2];
	/* regs[0]: registers, regs[1]: internal memory, used for I2C */

	struct mutex lock;

	/* LNB power shared among sat-FEs */
	int lnb_on_cnt; /* LNB power on count */

	/* LNA shared among terr-FEs */
	int lna_on_cnt; /* booster enabled count */

	int num_bufs;  /* number of DMA buffers allocated/mapped per FE */

	struct i2c_adapter i2c_adap;
	struct pt3_i2cbuf *i2c_buf;

	struct pt3_adapter *adaps[PT3_NUM_FE];
};


/*
 * prototypes
 */
extern int  pt3_alloc_dmabuf(struct pt3_adapter *adap);
extern void pt3_init_dmabuf(struct pt3_adapter *adap);
extern void pt3_free_dmabuf(struct pt3_adapter *adap);
extern int  pt3_start_dma(struct pt3_adapter *adap);
extern int  pt3_stop_dma(struct pt3_adapter *adap);
extern int  pt3_proc_dma(struct pt3_adapter *adap);

extern int  pt3_i2c_master_xfer(struct i2c_adapter *adap,
				struct i2c_msg *msgs, int num);
extern u32  pt3_i2c_functionality(struct i2c_adapter *adap);
extern void pt3_i2c_reset(struct pt3_board *pt3);
extern int  pt3_init_all_demods(struct pt3_board *pt3);
extern int  pt3_init_all_mxl301rf(struct pt3_board *pt3);
#endif /* PT3_H */