source: trunk/modules/vci_spi/caba/source/include/vci_spi.h @ 551

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 * Copyright (c) UPMC, Lip6, SoC
 *         manuel.bouyer@lip6.fr october 2013
 *
 * Maintainers: bouyer
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//////////////////////////////////////////////////////////////////////////////////////
// This component is a SPI controller with a VCI interface
// It supports only 32 or 64 bits VCI DATA width, but all addressable registers
// contain 32 bits words. It supports VCI addresss lartger than 32 bits.
//
// This component can perform data transfers between one single file belonging 
// to the host system and a buffer in the memory of the virtual prototype.
// The file name is an argument of the constructor.
// This component has a DMA capability, and is both a target and an initiator.
// The burst size (bytes) must be power of 2.
// The burst size is typically a cache line. 
// The memory buffer must be aligned to a a burst boundary.
// Both read and write transfers are supported. An IRQ is optionally
// asserted when the transfer is completed. 
//

#ifndef SOCLIB_VCI_SPI_H
#define SOCLIB_VCI_SPI_H

#include <stdint.h>
#include <systemc>
#include <unistd.h>
#include "caba_base_module.h"
#include "mapping_table.h"
#include "vci_initiator.h"
#include "vci_target.h"

namespace soclib {
namespace caba {

using namespace sc_core;

template<typename vci_param>
class VciSpi
        : public caba::BaseModule
{
private:

    // Registers
    sc_signal<int>                     r_target_fsm;       // target fsm state register
    sc_signal<int>                     r_initiator_fsm;    // initiator fsm state register
    sc_signal<int>                     r_spi_fsm;          // spi engine state
    sc_signal<uint64_t>                r_txrx[2];          // data in/out
    sc_signal<uint32_t>                r_divider;          // SPI clk divider
    sc_signal<uint8_t>                 r_ss;               // SPI slave select
    sc_signal<bool>                    r_ctrl_cpol;     // clock polarity
    sc_signal<bool>                    r_ctrl_cpha;     // clock phase
    sc_signal<bool>                    r_ctrl_ass;      // auto slave select
    sc_signal<bool>                    r_ctrl_ie;       // interrupt enable
    sc_signal<bool>                    r_ctrl_go_bsy;
    sc_signal<uint8_t>                 r_ctrl_char_len; // number of bits in xfer

    sc_signal<uint8_t>                 r_txrx_addr;

    sc_signal<uint32_t>                r_bit_count;
    sc_signal<uint32_t>                r_clk_counter;
    sc_signal<bool>                    r_spi_clk;
    sc_signal<bool>                    r_spi_clk_previous;
    sc_signal<bool>                    r_spi_clk_ignore;
    sc_signal<bool>                    r_spi_out;
    sc_signal<bool>                    r_irq;

    sc_signal<bool>                    r_read;
    sc_signal<uint32_t>                r_nblocks;          // number of blocks in transfer
    sc_signal<uint64_t>                r_buf_address;      // memory buffer address 
    sc_signal<uint32_t>                r_index;            // word index in local buffer
    sc_signal<uint32_t>                r_latency_count;    // latency counter 
    sc_signal<uint32_t>                r_words_count;      // word counter (in a burst)
    sc_signal<uint32_t>                r_burst_count;      // burst counter (in a block)
    sc_signal<uint32_t>                r_block_count;      // block counter (in a transfer)
    sc_signal<uint32_t>                r_burst_offset;     // number of non aligned words
    sc_signal<uint32_t>                r_burst_nwords;     // number of words in a burst
    sc_signal<bool>                    r_go;               // command from T_FSM to M_FSM

    sc_signal<typename vci_param::srcid_t >     r_srcid;   // save srcid
    sc_signal<typename vci_param::trdid_t >     r_trdid;   // save trdid
    sc_signal<typename vci_param::pktid_t >     r_pktid;   // save pktid
    sc_signal<typename vci_param::data_t >      r_tdata;   // save wdata

    uint32_t*                          r_local_buffer;     // capacity is one block 

    // structural parameters
    std::list<soclib::common::Segment> m_seglist;
    uint32_t                           m_srcid;            // initiator index
    const uint32_t                     m_words_per_block;  // block size 
    const uint32_t                     m_words_per_burst;  // number of words in a burst
    const uint32_t                     m_bursts_per_block; // number of bursts in a block

    // methods
    void transition();
    void genMoore();

    //  Master FSM states
    enum {
    M_IDLE              = 0,

    M_READ_BLOCK        = 1,
    M_READ_BURST        = 2,
    M_READ_CMD          = 3,
    M_READ_RSP          = 4,
    M_READ_SUCCESS      = 5,
    M_READ_ERROR        = 6,

    M_WRITE_BURST       = 7,
    M_WRITE_CMD         = 8,
    M_WRITE_RSP         = 9,
    M_WRITE_BLOCK       = 10,
    M_WRITE_SUCCESS     = 11,
    M_WRITE_ERROR       = 12,
    };

    // Target FSM states
    enum {
    T_IDLE              = 0,
    T_WRITE_TXRX        = 1,
    T_READ_TXRX         = 2,
    T_WRITE_CTRL        = 3,
    T_READ_CTRL         = 4,
    T_WRITE_DIVIDER     = 5,
    T_READ_DIVIDER      = 6,
    T_WRITE_SS          = 7,
    T_READ_SS           = 8,
    T_WRITE_ERROR       = 9,
    T_READ_ERROR        = 10,
    };

    // SPI FSM states
    enum {
    S_IDLE              = 0,
    S_XMIT              = 1,
    };

    // Error codes values
    enum {
    VCI_READ_OK         = 0,
    VCI_READ_ERROR      = 1,
    VCI_WRITE_OK        = 2,
    VCI_WRITE_ERROR     = 3,
    };

    /* transaction type, pktid field */
    enum transaction_type_e
    {
      // b3 unused
      // b2 READ / NOT READ
      // Si READ
      //  b1 DATA / INS
      //  b0 UNC / MISS
      // Si NOT READ
      //  b1 accÚs table llsc type SW / other
      //  b2 WRITE/CAS/LL/SC
      TYPE_READ_DATA_UNC          = 0x0,
      TYPE_READ_DATA_MISS         = 0x1,
      TYPE_READ_INS_UNC           = 0x2,
      TYPE_READ_INS_MISS          = 0x3,
      TYPE_WRITE                  = 0x4,
      TYPE_CAS                    = 0x5,
      TYPE_LL                     = 0x6,
      TYPE_SC                     = 0x7
    };

protected:

    SC_HAS_PROCESS(VciSpi);

public:

    // ports
    sc_in<bool>                                               p_clk;
    sc_in<bool>                                               p_resetn;
    sc_out<bool>                                              p_irq;
    soclib::caba::VciInitiator<vci_param> p_vci_initiator;
    soclib::caba::VciTarget<vci_param>    p_vci_target;
    sc_out<bool>                                              p_spi_ss;
    sc_out<bool>                                              p_spi_clk;
    sc_out<bool>                                              p_spi_mosi;
    sc_in<bool>                                               p_spi_miso;

    void print_trace();

    // Constructor   
    VciSpi(
        sc_module_name                      name,
        const soclib::common::MappingTable  &mt,
        const soclib::common::IntTab        &srcid,
        const soclib::common::IntTab        &tgtid,
        const uint32_t                      burst_size = 64);

    ~VciSpi();

};

}}

#endif /* SOCLIB_VCI_SPI_H */

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