/*
 * =================================================================
     >>>>>>>>>>>>>>>>>>>>>>> COPYRIGHT NOTICE <<<<<<<<<<<<<<<<<<<<<<<<<
     ------------------------------------------------------------------
     Copyright (c) 2006-2018 by Lattice Semiconductor Corporation
     ALL RIGHTS RESERVED
     ------------------------------------------------------------------

     IMPORTANT: THIS FILE IS AUTO-GENERATED BY LATTICE RADIANT Software.

     Permission:

	Lattice grants permission to use this code pursuant to the
	terms of the Lattice Corporation Open Source License Agreement.

     Disclaimer:

	Lattice provides no warranty regarding the use or functionality
	of this code. It is the user's responsibility to verify the
	user Software design for consistency and functionality through
	the use of formal Software validation methods.

     ------------------------------------------------------------------

     Lattice Semiconductor Corporation
     111 SW Fifth Avenue, Suite 700
     Portland, OR 97204
     U.S.A

     Email: techsupport@latticesemi.com
     Web: http://www.latticesemi.com/Home/Support/SubmitSupportTicket.aspx
     ==================================================================
*/

#include "spi_master.h"
#include "spi_master_regs.h"
#include "hal.h"

uint8_t spi_master_init(struct spim_instance *this_spim,
			uint32_t base_addr,
			uint8_t slave_count,
			uint8_t data_width,
			uint8_t clk_polarity,
			uint8_t clk_phase, uint8_t interrupts_en)
{
	if(this_spim == NULL)
		return -1;

	this_spim->base_address = base_addr;
	this_spim->slave_count = slave_count;

	this_spim->data_width = data_width;
	this_spim->spi_clk_polarity = clk_polarity;
	this_spim->spi_clk_phase = clk_phase;
	this_spim->interrupts_en_bits = interrupts_en;

	// clear the tx/rx fifo
	reg_8b_write(this_spim->base_address | SPI_MASTER_FIFO_RST,
	                 SPI_MASTER_TX_FIFO_RST|SPI_MASTER_RX_FIFO_RST);

	// enable all the INTs by default
	reg_8b_write(this_spim->base_address | SPI_MASTER_INT_ENABLE,0xff);

	reg_8b_write(this_spim->base_address | SPI_MASTER_BYTE_COUNT_RST, 0xff);

	// manually clear the FIFO reset flag
	reg_8b_write(this_spim->base_address | SPI_MASTER_FIFO_RST, 0);

	return 0;
}

uint8_t spi_master_config(struct spim_instance *this_spim,
                          spim_data_width data_width,
                          uint16_t prescaler,
                          uint8_t clk_polarity, uint8_t clk_phase,uint8_t ssnp)
{
	uint8_t spi_config = 0;
	uint8_t status = 0;

	if(this_spim == NULL)
		return -1;

	spi_config =
		   (data_width << 3) | (ssnp<<2) |(clk_polarity << 1) | clk_phase;
	reg_8b_modify(this_spim->base_address | SPI_MASTER_SPI_CFG,SPI_CFG_DATA_WIDTH_MASK | SPI_CFG_CPOL_MASK | SPI_CFG_CPHA_MASK | SPI_CFG_SSNP_MASK, spi_config);

	//reg_8b_write(this_spim->base_address | SPI_MASTER_SPI_CFG,0);
    reg_8b_write(this_spim->base_address | SPI_MASTER_CLK_PRESCALER_LOW, prescaler & 0xff);
    reg_8b_write(this_spim->base_address | SPI_MASTER_CLK_PRESCALER_HIGH, prescaler >> 8);
    reg_8b_write(this_spim->base_address | SPI_MASTER_BYTE_COUNT_RST, 0xff);
	return status;
}



uint8_t spi_master_transfer(struct spim_instance *this_spim,
			    uint32_t *data_buffer_out,
			    uint32_t byte_out_size,
			    uint32_t *data_buffer_in,
			    uint32_t byte_in_size)
{
	uint8_t int_status = 0;
	uint32_t byte_out_cnt = 0;
	uint32_t byte_in_cnt = 0;
	uint8_t ret_val = 0;
	uint8_t fifo;
	uint32_t value;

	if(this_spim == NULL)
		return -1;

    // clear the tx/rx fifo
    reg_8b_write(this_spim->base_address | SPI_MASTER_FIFO_RST,
                     SPI_MASTER_TX_FIFO_RST|SPI_MASTER_RX_FIFO_RST);

	// clear all the interrupt bits
	reg_8b_write(this_spim->base_address | SPI_MASTER_INT_STATUS,
		     0xff);

    // clear the tx/rx fifo reset flag
    reg_8b_write(this_spim->base_address | SPI_MASTER_FIFO_RST, 0);

    reg_8b_write(this_spim->base_address | SPI_MASTER_BYTE_COUNT_RST, 0xff);
    // set the byte count register
    reg_8b_write(this_spim->base_address | SPI_MASTER_TARGET_WORD_COUNT, byte_out_size+byte_in_size);

	while(1)
	{
	    reg_8b_read(this_spim->base_address |
	            SPI_MASTER_INT_STATUS, &int_status);

	    // write the data into the out buffer
	    if(int_status & (SPI_INT_TX_BUFFER_FULL))
	    {
	    	 reg_8b_write(this_spim->base_address |
	    	                  SPI_MASTER_INT_STATUS, int_status & 0xff);
	    	break;
	    }
	    if(int_status & (SPI_INT_TRAN_CMP))
	    {
	        reg_8b_read(this_spim->base_address |
	    			SPI_MASTER_FIFO_STATUS, &fifo);
	    	if((fifo & SPI_MASTER_RX_FIFO_EMPTY) == 0)
	    	{

	    		for(byte_in_cnt=0;byte_in_cnt < byte_in_size;byte_in_cnt++)
				{
					reg_32b_read(this_spim->base_address |
							SPI_MASTER_RD_DATA, data_buffer_in);

					data_buffer_in++;
				}

	    	}
	    	reg_8b_write(this_spim->base_address |
	    	                  SPI_MASTER_INT_STATUS, int_status & 0xff);
	    	break;
	   	}
	    else
	    {
	        if(byte_out_cnt < byte_out_size)
	        {
	            reg_32b_write(this_spim->base_address |
	                     SPI_MASTER_WR_DATA, *data_buffer_out);

	            data_buffer_out++;
	        }
	        else if(byte_out_cnt < byte_in_size + byte_out_size)
	        {
	        	reg_32b_write(this_spim->base_address |
	                                 SPI_MASTER_WR_DATA, 0xffffffff);  // write dummy byte
            }

            byte_out_cnt++;
        }

	}
	return ret_val;
}

uint8_t spi_device_select(struct spim_instance *this_spim,
			  uint8_t enable_slave)
{
	uint8_t status = 0;

	if(this_spim == NULL)
		return -1;

	reg_8b_write(this_spim->base_address | SPI_MASTER_SLAVE_SEL,
		     enable_slave);

	return status;
}

void spi_master_isr(void* ctx)
{
	return;
}