master/mailbox.c
author Florian Pose <fp@igh-essen.com>
Mon, 10 Apr 2006 14:25:02 +0000
changeset 178 b84f69db8566
parent 154 94d780887be0
child 195 674071846ee3
permissions -rw-r--r--
MERGE branches/sysfs -> trunk (whole SysFS implementation)
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/******************************************************************************
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 *
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 *  m a i l b o x . c
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 *
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 *  Mailbox-Funktionen
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 *
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 *  $Id$
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 *
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 *****************************************************************************/
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include "mailbox.h"
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#include "command.h"
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#include "master.h"
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/*****************************************************************************/
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/**
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   Bereitet ein Mailbox-Send-Kommando vor.
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 */
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uint8_t *ec_slave_mbox_prepare_send(ec_slave_t *slave, /**< Slave */
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                                    uint8_t type, /**< Mailbox-Protokoll */
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                                    size_t size /**< Datengröße */
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                                    )
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{
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    ec_command_t *command = &slave->mbox_command;
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    size_t total_size;
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    if (unlikely(!slave->sii_mailbox_protocols)) {
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        EC_ERR("Slave %i does not support mailbox communication!\n",
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               slave->ring_position);
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        return NULL;
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    }
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    total_size = size + 6;
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    if (unlikely(total_size > slave->sii_rx_mailbox_size)) {
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        EC_ERR("Data size does not fit in mailbox!\n");
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        return NULL;
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    }
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    if (ec_command_npwr(command, slave->station_address,
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                        slave->sii_rx_mailbox_offset,
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                        slave->sii_rx_mailbox_size))
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        return NULL;
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    EC_WRITE_U16(command->data,     size); // Mailbox service data length
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    EC_WRITE_U16(command->data + 2, slave->station_address); // Station address
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    EC_WRITE_U8 (command->data + 4, 0x00); // Channel & priority
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    EC_WRITE_U8 (command->data + 5, type); // Underlying protocol type
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    return command->data + 6;
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}
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/*****************************************************************************/
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/**
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   Bereitet ein Kommando zum Abfragen des Mailbox-Zustandes vor.
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 */
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int ec_slave_mbox_prepare_check(ec_slave_t *slave /**< Slave */)
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{
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    ec_command_t *command = &slave->mbox_command;
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    // FIXME: Zweiter Sync-Manager nicht immer TX-Mailbox?
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    if (ec_command_nprd(command, slave->station_address, 0x808, 8))
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        return -1;
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    return 0;
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}
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/*****************************************************************************/
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/**
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   Liest den Mailbox-Zustand aus einem empfangenen Kommando.
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 */
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int ec_slave_mbox_check(const ec_slave_t *slave /**< Slave */)
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{
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    return EC_READ_U8(slave->mbox_command.data + 5) & 8 ? 1 : 0;
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}
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/*****************************************************************************/
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/**
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   Bereitet ein Kommando zum Laden von Daten von der Mailbox vor.
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 */
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int ec_slave_mbox_prepare_fetch(ec_slave_t *slave /**< Slave */)
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{
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    ec_command_t *command = &slave->mbox_command;
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    if (ec_command_nprd(command, slave->station_address,
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                        slave->sii_tx_mailbox_offset,
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                        slave->sii_tx_mailbox_size)) return -1;
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    return 0;
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}
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/*****************************************************************************/
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/**
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   Verarbeitet empfangene Mailbox-Daten.
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 */
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uint8_t *ec_slave_mbox_fetch(ec_slave_t *slave, /**< Slave */
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                             uint8_t type, /**< Protokoll */
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                             size_t *size /**< Größe der empfangenen Daten */
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                             )
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{
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    ec_command_t *command = &slave->mbox_command;
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    size_t data_size;
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    if ((EC_READ_U8(command->data + 5) & 0x0F) != type) {
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        EC_ERR("Unexpected mailbox protocol 0x%02X (exp.: 0x%02X) at"
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               " slave %i!\n", EC_READ_U8(command->data + 5), type,
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               slave->ring_position);
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        return NULL;
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    }
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    if ((data_size = EC_READ_U16(command->data)) >
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        slave->sii_tx_mailbox_size - 6) {
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        EC_ERR("Currupt mailbox response detected!\n");
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        return NULL;
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    }
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    *size = data_size;
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    return command->data + 6;
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}
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/*****************************************************************************/
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/**
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   Sendet und wartet auf den Empfang eines Mailbox-Kommandos.
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 */
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uint8_t *ec_slave_mbox_simple_io(ec_slave_t *slave, /**< Slave */
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                                 size_t *size /**< Größe der gelesenen
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                                                 Daten */
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                                 )
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{
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    uint8_t type;
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    ec_command_t *command;
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    command = &slave->mbox_command;
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    type = EC_READ_U8(command->data + 5);
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    if (unlikely(ec_master_simple_io(slave->master, command))) {
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        EC_ERR("Mailbox checking failed on slave %i!\n",
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               slave->ring_position);
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        return NULL;
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    }
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    return ec_slave_mbox_simple_receive(slave, type, size);
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}
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/*****************************************************************************/
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/**
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   Wartet auf den Empfang eines Mailbox-Kommandos.
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 */
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uint8_t *ec_slave_mbox_simple_receive(ec_slave_t *slave, /**< Slave */
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                                      uint8_t type, /**< Protokoll */
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                                      size_t *size /**< Größe der gelesenen
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                                                      Daten */
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                                      )
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{
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    cycles_t start, end, timeout;
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    ec_command_t *command;
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    command = &slave->mbox_command;
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    start = get_cycles();
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    timeout = (cycles_t) 100 * cpu_khz; // 100ms
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    while (1)
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    {
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        if (ec_slave_mbox_prepare_check(slave)) return NULL;
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        if (unlikely(ec_master_simple_io(slave->master, command))) {
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            EC_ERR("Mailbox checking failed on slave %i!\n",
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                   slave->ring_position);
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            return NULL;
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        }
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        end = get_cycles();
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        if (ec_slave_mbox_check(slave))
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            break; // Proceed with receiving data
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        if ((end - start) >= timeout) {
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   192
            EC_ERR("Mailbox check - Slave %i timed out.\n",
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   193
                   slave->ring_position);
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   194
            return NULL;
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   195
        }
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        udelay(100);
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   198
    }
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    if (ec_slave_mbox_prepare_fetch(slave)) return NULL;
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   201
    if (unlikely(ec_master_simple_io(slave->master, command))) {
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   202
        EC_ERR("Mailbox receiving failed on slave %i!\n",
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   203
               slave->ring_position);
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   204
        return NULL;
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   205
    }
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   206
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   207
    if (unlikely(slave->master->debug_level) > 1)
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   208
        EC_DBG("Mailbox receive took %ius.\n", ((u32) (end - start) * 1000
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   209
                                                / cpu_khz));
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   210
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   211
    return ec_slave_mbox_fetch(slave, type, size);
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   212
}
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   213
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   214
/*****************************************************************************/