/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Earthsoft PT3 driver
 *
 * Copyright (C) 2014 Akihiro Tsukada <tskd08@gmail.com>
 */

#ifndef PT3_H
#define PT3_H

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

#include <media/dvb_demux.h>
#include <media/dvb_frontend.h>
#include <media/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 address 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 */