uboot-phytec

// SPDX-License-Identifier: GPL-2.0+

/*

 * Chromium OS cros_ec driver - LPC interface

 *

 * Copyright (c) 2012 The Chromium OS Authors.

 */

​

/*

 * The Matrix Keyboard Protocol driver handles talking to the keyboard

 * controller chip. Mostly this is for keyboard functions, but some other

 * things have slipped in, so we provide generic services to talk to the

 * KBC.

 */

​

#include <common.h>

#include <dm.h>

#include <command.h>

#include <cros_ec.h>

#include <asm/io.h>

​

#ifdef DEBUG_TRACE

#define debug_trace(fmt, b...)  debug(fmt, ##b)

#else

#define debug_trace(fmt, b...)

#endif

​

static int wait_for_sync(struct cros_ec_dev *dev)

{

    unsigned long start;

​

    start = get_timer(0);

    while (inb(EC_LPC_ADDR_HOST_CMD) & EC_LPC_STATUS_BUSY_MASK) {

        if (get_timer(start) > 1000) {

            debug("%s: Timeout waiting for CROS_EC sync\n",

                  __func__);

            return -1;

        }

    }

​

    return 0;

}

​

int cros_ec_lpc_packet(struct udevice *udev, int out_bytes, int in_bytes)

{

    struct cros_ec_dev *dev = dev_get_uclass_priv(udev);

    uint8_t *d;

    int i;

​

    if (out_bytes > EC_LPC_HOST_PACKET_SIZE)

        return log_msg_ret("Cannot send that many bytes\n", -E2BIG);

​

    if (in_bytes > EC_LPC_HOST_PACKET_SIZE)

        return log_msg_ret("Cannot receive that many bytes\n", -E2BIG);

​

    if (wait_for_sync(dev))

        return log_msg_ret("Timeout waiting ready\n", -ETIMEDOUT);

​

    /* Write data */

    for (i = 0, d = (uint8_t *)dev->dout; i < out_bytes; i++, d++)

        outb(*d, EC_LPC_ADDR_HOST_PACKET + i);

​

    /* Start the command */

    outb(EC_COMMAND_PROTOCOL_3, EC_LPC_ADDR_HOST_CMD);