linux-imx

// SPDX-License-Identifier: GPL-2.0-or-later

/*

 * Copyright (C) 2004 - 2006 rt2x00 SourceForge Project

 * <http://rt2x00.serialmonkey.com>

 *

 * Module: eeprom_93cx6

 * Abstract: EEPROM reader routines for 93cx6 chipsets.

 * Supported chipsets: 93c46 & 93c66.

 */

​

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/delay.h>

#include <linux/eeprom_93cx6.h>

​

MODULE_AUTHOR("http://rt2x00.serialmonkey.com");

MODULE_VERSION("1.0");

MODULE_DESCRIPTION("EEPROM 93cx6 chip driver");

MODULE_LICENSE("GPL");

​

static inline void eeprom_93cx6_pulse_high(struct eeprom_93cx6 *eeprom)

{

    eeprom->reg_data_clock = 1;

    eeprom->register_write(eeprom);

​

    /*

     * Add a short delay for the pulse to work.

     * According to the specifications the "maximum minimum"

     * time should be 450ns.

     */

    ndelay(450);

}

​

static inline void eeprom_93cx6_pulse_low(struct eeprom_93cx6 *eeprom)

{

    eeprom->reg_data_clock = 0;

    eeprom->register_write(eeprom);

​

    /*

     * Add a short delay for the pulse to work.

     * According to the specifications the "maximum minimum"

     * time should be 450ns.

     */

    ndelay(450);

}

​

static void eeprom_93cx6_startup(struct eeprom_93cx6 *eeprom)

{

    /*

     * Clear all flags, and enable chip select.

     */

    eeprom->register_read(eeprom);

    eeprom->reg_data_in = 0;

    eeprom->reg_data_out = 0;

    eeprom->reg_data_clock = 0;

    eeprom->reg_chip_select = 1;

    eeprom->drive_data = 1;

    eeprom->register_write(eeprom);

​

    /*

     * kick a pulse.

     */

    eeprom_93cx6_pulse_high(eeprom);

    eeprom_93cx6_pulse_low(eeprom);

}

​

static void eeprom_93cx6_cleanup(struct eeprom_93cx6 *eeprom)

{

    /*

     * Clear chip_select and data_in flags.

     */

    eeprom->register_read(eeprom);

    eeprom->reg_data_in = 0;

    eeprom->reg_chip_select = 0;

    eeprom->register_write(eeprom);

​

    /*

     * kick a pulse.

     */

    eeprom_93cx6_pulse_high(eeprom);

    eeprom_93cx6_pulse_low(eeprom);

}

​

static void eeprom_93cx6_write_bits(struct eeprom_93cx6 *eeprom,

    const u16 data, const u16 count)

{

    unsigned int i;

​

    eeprom->register_read(eeprom);

​

    /*

     * Clear data flags.