linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * Lattice MachXO2 Slave SPI Driver

 *

 * Manage Lattice FPGA firmware that is loaded over SPI using

 * the slave serial configuration interface.

 *

 * Copyright (C) 2018 Paolo Pisati <p.pisati@gmail.com>

 */

​

#include <linux/delay.h>

#include <linux/fpga/fpga-mgr.h>

#include <linux/gpio/consumer.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/spi/spi.h>

​

/* MachXO2 Programming Guide - sysCONFIG Programming Commands */

#define IDCODE_PUB      {0xe0, 0x00, 0x00, 0x00}

#define ISC_ENABLE      {0xc6, 0x08, 0x00, 0x00}

#define ISC_ERASE       {0x0e, 0x04, 0x00, 0x00}

#define ISC_PROGRAMDONE     {0x5e, 0x00, 0x00, 0x00}

#define LSC_INITADDRESS     {0x46, 0x00, 0x00, 0x00}

#define LSC_PROGINCRNV      {0x70, 0x00, 0x00, 0x01}

#define LSC_READ_STATUS     {0x3c, 0x00, 0x00, 0x00}

#define LSC_REFRESH     {0x79, 0x00, 0x00, 0x00}

​

/*

 * Max CCLK in Slave SPI mode according to 'MachXO2 Family Data

 * Sheet' sysCONFIG Port Timing Specifications (3-36)

 */

#define MACHXO2_MAX_SPEED       66000000

​

#define MACHXO2_LOW_DELAY_USEC      5

#define MACHXO2_HIGH_DELAY_USEC     200

#define MACHXO2_REFRESH_USEC        4800

#define MACHXO2_MAX_BUSY_LOOP       128

#define MACHXO2_MAX_REFRESH_LOOP    16

​

#define MACHXO2_PAGE_SIZE       16

#define MACHXO2_BUF_SIZE        (MACHXO2_PAGE_SIZE + 4)

​

/* Status register bits, errors and error mask */

#define BUSY    12

#define DONE    8

#define DVER    27

#define ENAB    9

#define ERRBITS 23

#define ERRMASK 7

#define FAIL    13

​

#define ENOERR  0 /* no error */

#define EID 1

#define ECMD    2

#define ECRC    3

#define EPREAM  4 /* preamble error */

#define EABRT   5 /* abort error */

#define EOVERFL 6 /* overflow error */

#define ESDMEOF 7 /* SDM EOF */

​

static inline u8 get_err(unsigned long *status)

{

    return (*status >> ERRBITS) & ERRMASK;