softing_fw.c

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/*
 * Copyright (C) 2008-2010
 *
 * - Kurt Van Dijck, EIA Electronics
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the version 2 of the GNU General Public License
 * as published by the Free Software Foundation
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/firmware.h>
#include <linux/sched.h>
#include <asm/div64.h>
#include <asm/io.h>

#include "softing.h"

/*
 * low level DPRAM command.
 * Make sure that card->dpram[DPRAM_FCT_HOST] is preset
 */
static int _softing_fct_cmd(struct softing *card, int16_t cmd, uint16_t vector,
        const char *msg)
{
    int ret;
    unsigned long stamp;

    iowrite16(cmd, &card->dpram[DPRAM_FCT_PARAM]);
    iowrite8(vector >> 8, &card->dpram[DPRAM_FCT_HOST + 1]);
    iowrite8(vector, &card->dpram[DPRAM_FCT_HOST]);
    /* be sure to flush this to the card */
    wmb();
    stamp = jiffies + 1 * HZ;
    /* wait for card */
    do {
        /* DPRAM_FCT_HOST is _not_ aligned */
        ret = ioread8(&card->dpram[DPRAM_FCT_HOST]) +
            (ioread8(&card->dpram[DPRAM_FCT_HOST + 1]) << 8);
        /* don't have any cached variables */
        rmb();
        if (ret == RES_OK)
            /* read return-value now */
            return ioread16(&card->dpram[DPRAM_FCT_RESULT]);

        if ((ret != vector) || time_after(jiffies, stamp))
            break;
        /* process context => relax */
        usleep_range(500, 10000);
    } while (1);

    ret = (ret == RES_NONE) ? -ETIMEDOUT : -ECANCELED;
    dev_alert(&card->pdev->dev, "firmware %s failed (%i)\n", msg, ret);
    return ret;
}

static int softing_fct_cmd(struct softing *card, int16_t cmd, const char *msg)
{
    int ret;

    ret = _softing_fct_cmd(card, cmd, 0, msg);
    if (ret > 0) {
        dev_alert(&card->pdev->dev, "%s returned %u\n", msg, ret);
        ret = -EIO;
    }
    return ret;
}

int softing_bootloader_command(struct softing *card, int16_t cmd,
        const char *msg)
{
    int ret;
    unsigned long stamp;

    iowrite16(RES_NONE, &card->dpram[DPRAM_RECEIPT]);
    iowrite16(cmd, &card->dpram[DPRAM_COMMAND]);
    /* be sure to flush this to the card */
    wmb();
    stamp = jiffies + 3 * HZ;
    /* wait for card */
    do {
        ret = ioread16(&card->dpram[DPRAM_RECEIPT]);
        /* don't have any cached variables */
        rmb();
        if (ret == RES_OK)
            return 0;
        if (time_after(jiffies, stamp))
            break;
        /* process context => relax */
        usleep_range(500, 10000);
    } while (!signal_pending(current));

    ret = (ret == RES_NONE) ? -ETIMEDOUT : -ECANCELED;
    dev_alert(&card->pdev->dev, "bootloader %s failed (%i)\n", msg, ret);
    return ret;
}

static int fw_parse(const uint8_t **pmem, uint16_t *ptype, uint32_t *paddr,
        uint16_t *plen, const uint8_t **pdat)
{
    uint16_t checksum[2];
    const uint8_t *mem;
    const uint8_t *end;

    /*
     * firmware records are a binary, unaligned stream composed of:
     * uint16_t type;
     * uint32_t addr;
     * uint16_t len;
     * uint8_t dat[len];
     * uint16_t checksum;
     * all values in little endian.
     * We could define a struct for this, with __attribute__((packed)),
     * but would that solve the alignment in _all_ cases (cfr. the
     * struct itself may be an odd address)?
     *
     * I chose to use leXX_to_cpup() since this solves both
     * endianness & alignment.
     */
    mem = *pmem;
    *ptype = le16_to_cpup((void *)&mem[0]);
    *paddr = le32_to_cpup((void *)&mem[2]);
    *plen = le16_to_cpup((void *)&mem[6]);
    *pdat = &mem[8];
    /* verify checksum */
    end = &mem[8 + *plen];
    checksum[0] = le16_to_cpup((void *)end);
    for (checksum[1] = 0; mem < end; ++mem)
        checksum[1] += *mem;
    if (checksum[0] != checksum[1])
        return -EINVAL;
    /* increment */
    *pmem += 10 + *plen;
    return 0;
}

int softing_load_fw(const char *file, struct softing *card,
        __iomem uint8_t *dpram, unsigned int size, int offset)
{
    const struct firmware *fw;
    int ret;
    const uint8_t *mem, *end, *dat;
    uint16_t type, len;
    uint32_t addr;
    uint8_t *buf = NULL, *new_buf;
    int buflen = 0;
    int8_t type_end = 0;

    ret = request_firmware(&fw, file, &card->pdev->dev);
    if (ret < 0)
        return ret;
    dev_dbg(&card->pdev->dev, "%s, firmware(%s) got %u bytes"
        ", offset %c0x%04x\n",
        card->pdat->name, file, (unsigned int)fw->size,
        (offset >= 0) ? '+' : '-', (unsigned int)abs(offset));
    /* parse the firmware */
    mem = fw->data;
    end = &mem[fw->size];
    /* look for header record */
    ret = fw_parse(&mem, &type, &addr, &len, &dat);
    if (ret < 0)
        goto failed;
    if (type != 0xffff)
        goto failed;
    if (strncmp("Structured Binary Format, Softing GmbH" , dat, len)) {
        ret = -EINVAL;
        goto failed;
    }
    /* ok, we had a header */
    while (mem < end) {
        ret = fw_parse(&mem, &type, &addr, &len, &dat);
        if (ret < 0)
            goto failed;
        if (type == 3) {
            /* start address, not used here */
            continue;
        } else if (type == 1) {
            /* eof */
            type_end = 1;
            break;
        } else if (type != 0) {
            ret = -EINVAL;
            goto failed;
        }

        if ((addr + len + offset) > size)
            goto failed;
        memcpy_toio(&dpram[addr + offset], dat, len);
        /* be sure to flush caches from IO space */
        mb();
        if (len > buflen) {
            /* align buflen */
            buflen = (len + (1024-1)) & ~(1024-1);
            new_buf = krealloc(buf, buflen, GFP_KERNEL);
            if (!new_buf) {
                ret = -ENOMEM;
                goto failed;
            }
            buf = new_buf;
        }
        /* verify record data */
        memcpy_fromio(buf, &dpram[addr + offset], len);
        if (memcmp(buf, dat, len)) {
            /* is not ok */
            dev_alert(&card->pdev->dev, "DPRAM readback failed\n");
            ret = -EIO;
            goto failed;
        }
    }
    if (!type_end)
        /* no end record seen */
        goto failed;
    ret = 0;
failed:
    kfree(buf);
    release_firmware(fw);
    if (ret < 0)
        dev_info(&card->pdev->dev, "firmware %s failed\n", file);
    return ret;
}

int softing_load_app_fw(const char *file, struct softing *card)
{
    const struct firmware *fw;
    const uint8_t *mem, *end, *dat;
    int ret, j;
    uint16_t type, len;
    uint32_t addr, start_addr = 0;
    unsigned int sum, rx_sum;
    int8_t type_end = 0, type_entrypoint = 0;

    ret = request_firmware(&fw, file, &card->pdev->dev);
    if (ret) {
        dev_alert(&card->pdev->dev, "request_firmware(%s) got %i\n",
            file, ret);
        return ret;
    }
    dev_dbg(&card->pdev->dev, "firmware(%s) got %lu bytes\n",
        file, (unsigned long)fw->size);
    /* parse the firmware */
    mem = fw->data;
    end = &mem[fw->size];
    /* look for header record */
    ret = fw_parse(&mem, &type, &addr, &len, &dat);
    if (ret)
        goto failed;
    ret = -EINVAL;
    if (type != 0xffff) {
        dev_alert(&card->pdev->dev, "firmware starts with type 0x%x\n",
            type);
        goto failed;
    }
    if (strncmp("Structured Binary Format, Softing GmbH", dat, len)) {
        dev_alert(&card->pdev->dev, "firmware string '%.*s' fault\n",
                len, dat);
        goto failed;
    }
    /* ok, we had a header */
    while (mem < end) {
        ret = fw_parse(&mem, &type, &addr, &len, &dat);
        if (ret)
            goto failed;

        if (type == 3) {
            /* start address */
            start_addr = addr;
            type_entrypoint = 1;
            continue;
        } else if (type == 1) {
            /* eof */
            type_end = 1;
            break;
        } else if (type != 0) {
            dev_alert(&card->pdev->dev,
                    "unknown record type 0x%04x\n", type);
            ret = -EINVAL;
            goto failed;
        }

        /* regualar data */
        for (sum = 0, j = 0; j < len; ++j)
            sum += dat[j];
        /* work in 16bit (target) */
        sum &= 0xffff;

        memcpy_toio(&card->dpram[card->pdat->app.offs], dat, len);
        iowrite32(card->pdat->app.offs + card->pdat->app.addr,
                &card->dpram[DPRAM_COMMAND + 2]);
        iowrite32(addr, &card->dpram[DPRAM_COMMAND + 6]);
        iowrite16(len, &card->dpram[DPRAM_COMMAND + 10]);
        iowrite8(1, &card->dpram[DPRAM_COMMAND + 12]);
        ret = softing_bootloader_command(card, 1, "loading app.");
        if (ret < 0)
            goto failed;
        /* verify checksum */
        rx_sum = ioread16(&card->dpram[DPRAM_RECEIPT + 2]);
        if (rx_sum != sum) {
            dev_alert(&card->pdev->dev, "SRAM seems to be damaged"
                ", wanted 0x%04x, got 0x%04x\n", sum, rx_sum);
            ret = -EIO;
            goto failed;
        }
    }
    if (!type_end || !type_entrypoint)
        goto failed;
    /* start application in card */
    iowrite32(start_addr, &card->dpram[DPRAM_COMMAND + 2]);
    iowrite8(1, &card->dpram[DPRAM_COMMAND + 6]);
    ret = softing_bootloader_command(card, 3, "start app.");
    if (ret < 0)
        goto failed;
    ret = 0;
failed:
    release_firmware(fw);
    if (ret < 0)
        dev_info(&card->pdev->dev, "firmware %s failed\n", file);
    return ret;
}

static int softing_reset_chip(struct softing *card)
{
    int ret;

    do {
        /* reset chip */
        iowrite8(0, &card->dpram[DPRAM_RESET_RX_FIFO]);
        iowrite8(0, &card->dpram[DPRAM_RESET_RX_FIFO+1]);
        iowrite8(1, &card->dpram[DPRAM_RESET]);
        iowrite8(0, &card->dpram[DPRAM_RESET+1]);

        ret = softing_fct_cmd(card, 0, "reset_can");
        if (!ret)
            break;
        if (signal_pending(current))
            /* don't wait any longer */
            break;
    } while (1);
    card->tx.pending = 0;
    return ret;
}

int softing_chip_poweron(struct softing *card)
{
    int ret;
    /* sync */
    ret = _softing_fct_cmd(card, 99, 0x55, "sync-a");
    if (ret < 0)
        goto failed;

    ret = _softing_fct_cmd(card, 99, 0xaa, "sync-b");
    if (ret < 0)
        goto failed;

    ret = softing_reset_chip(card);
    if (ret < 0)
        goto failed;
    /* get_serial */
    ret = softing_fct_cmd(card, 43, "get_serial_number");
    if (ret < 0)
        goto failed;
    card->id.serial = ioread32(&card->dpram[DPRAM_FCT_PARAM]);
    /* get_version */
    ret = softing_fct_cmd(card, 12, "get_version");
    if (ret < 0)
        goto failed;
    card->id.fw_version = ioread16(&card->dpram[DPRAM_FCT_PARAM + 2]);
    card->id.hw_version = ioread16(&card->dpram[DPRAM_FCT_PARAM + 4]);
    card->id.license = ioread16(&card->dpram[DPRAM_FCT_PARAM + 6]);
    card->id.chip[0] = ioread16(&card->dpram[DPRAM_FCT_PARAM + 8]);
    card->id.chip[1] = ioread16(&card->dpram[DPRAM_FCT_PARAM + 10]);
    return 0;
failed:
    return ret;
}

static void softing_initialize_timestamp(struct softing *card)
{
    uint64_t ovf;

    card->ts_ref = ktime_get();

    /* 16MHz is the reference */
    ovf = 0x100000000ULL * 16;
    do_div(ovf, card->pdat->freq ?: 16);

    card->ts_overflow = ktime_add_us(ktime_set(0, 0), ovf);
}

ktime_t softing_raw2ktime(struct softing *card, u32 raw)
{
    uint64_t rawl;
    ktime_t now, real_offset;
    ktime_t target;
    ktime_t tmp;

    now = ktime_get();
    real_offset = ktime_sub(ktime_get_real(), now);

    /* find nsec from card */
    rawl = raw * 16;
    do_div(rawl, card->pdat->freq ?: 16);
    target = ktime_add_us(card->ts_ref, rawl);
    /* test for overflows */
    tmp = ktime_add(target, card->ts_overflow);
    while (unlikely(ktime_to_ns(tmp) > ktime_to_ns(now))) {
        card->ts_ref = ktime_add(card->ts_ref, card->ts_overflow);
        target = tmp;
        tmp = ktime_add(target, card->ts_overflow);
    }
    return ktime_add(target, real_offset);
}

static inline int softing_error_reporting(struct net_device *netdev)
{
    struct softing_priv *priv = netdev_priv(netdev);

    return (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
        ? 1 : 0;
}

int softing_startstop(struct net_device *dev, int up)
{
    int ret;
    struct softing *card;
    struct softing_priv *priv;
    struct net_device *netdev;
    int bus_bitmask_start;
    int j, error_reporting;
    struct can_frame msg;
    const struct can_bittiming *bt;

    priv = netdev_priv(dev);
    card = priv->card;

    if (!card->fw.up)
        return -EIO;

    ret = mutex_lock_interruptible(&card->fw.lock);
    if (ret)
        return ret;

    bus_bitmask_start = 0;
    if (dev && up)
        /* prepare to start this bus as well */
        bus_bitmask_start |= (1 << priv->index);
    /* bring netdevs down */
    for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
        netdev = card->net[j];
        if (!netdev)
            continue;
        priv = netdev_priv(netdev);

        if (dev != netdev)
            netif_stop_queue(netdev);

        if (netif_running(netdev)) {
            if (dev != netdev)
                bus_bitmask_start |= (1 << j);
            priv->tx.pending = 0;
            priv->tx.echo_put = 0;
            priv->tx.echo_get = 0;
            /*
             * this bus' may just have called open_candev()
             * which is rather stupid to call close_candev()
             * already
             * but we may come here from busoff recovery too
             * in which case the echo_skb _needs_ flushing too.
             * just be sure to call open_candev() again
             */
            close_candev(netdev);
        }
        priv->can.state = CAN_STATE_STOPPED;
    }
    card->tx.pending = 0;

    softing_enable_irq(card, 0);
    ret = softing_reset_chip(card);
    if (ret)
        goto failed;
    if (!bus_bitmask_start)
        /* no busses to be brought up */
        goto card_done;

    if ((bus_bitmask_start & 1) && (bus_bitmask_start & 2)
            && (softing_error_reporting(card->net[0])
                != softing_error_reporting(card->net[1]))) {
        dev_alert(&card->pdev->dev,
                "err_reporting flag differs for busses\n");
        goto invalid;
    }
    error_reporting = 0;
    if (bus_bitmask_start & 1) {
        netdev = card->net[0];
        priv = netdev_priv(netdev);
        error_reporting += softing_error_reporting(netdev);
        /* init chip 1 */
        bt = &priv->can.bittiming;
        iowrite16(bt->brp, &card->dpram[DPRAM_FCT_PARAM + 2]);
        iowrite16(bt->sjw, &card->dpram[DPRAM_FCT_PARAM + 4]);
        iowrite16(bt->phase_seg1 + bt->prop_seg,
                &card->dpram[DPRAM_FCT_PARAM + 6]);
        iowrite16(bt->phase_seg2, &card->dpram[DPRAM_FCT_PARAM + 8]);
        iowrite16((priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) ? 1 : 0,
                &card->dpram[DPRAM_FCT_PARAM + 10]);
        ret = softing_fct_cmd(card, 1, "initialize_chip[0]");
        if (ret < 0)
            goto failed;
        /* set mode */
        iowrite16(0, &card->dpram[DPRAM_FCT_PARAM + 2]);
        iowrite16(0, &card->dpram[DPRAM_FCT_PARAM + 4]);
        ret = softing_fct_cmd(card, 3, "set_mode[0]");
        if (ret < 0)
            goto failed;
        /* set filter */
        /* 11bit id & mask */
        iowrite16(0x0000, &card->dpram[DPRAM_FCT_PARAM + 2]);
        iowrite16(0x07ff, &card->dpram[DPRAM_FCT_PARAM + 4]);
        /* 29bit id.lo & mask.lo & id.hi & mask.hi */
        iowrite16(0x0000, &card->dpram[DPRAM_FCT_PARAM + 6]);
        iowrite16(0xffff, &card->dpram[DPRAM_FCT_PARAM + 8]);
        iowrite16(0x0000, &card->dpram[DPRAM_FCT_PARAM + 10]);
        iowrite16(0x1fff, &card->dpram[DPRAM_FCT_PARAM + 12]);
        ret = softing_fct_cmd(card, 7, "set_filter[0]");
        if (ret < 0)
            goto failed;
        /* set output control */
        iowrite16(priv->output, &card->dpram[DPRAM_FCT_PARAM + 2]);
        ret = softing_fct_cmd(card, 5, "set_output[0]");
        if (ret < 0)
            goto failed;
    }
    if (bus_bitmask_start & 2) {
        netdev = card->net[1];
        priv = netdev_priv(netdev);
        error_reporting += softing_error_reporting(netdev);
        /* init chip2 */
        bt = &priv->can.bittiming;
        iowrite16(bt->brp, &card->dpram[DPRAM_FCT_PARAM + 2]);
        iowrite16(bt->sjw, &card->dpram[DPRAM_FCT_PARAM + 4]);
        iowrite16(bt->phase_seg1 + bt->prop_seg,
                &card->dpram[DPRAM_FCT_PARAM + 6]);
        iowrite16(bt->phase_seg2, &card->dpram[DPRAM_FCT_PARAM + 8]);
        iowrite16((priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) ? 1 : 0,
                &card->dpram[DPRAM_FCT_PARAM + 10]);
        ret = softing_fct_cmd(card, 2, "initialize_chip[1]");
        if (ret < 0)
            goto failed;
        /* set mode2 */
        iowrite16(0, &card->dpram[DPRAM_FCT_PARAM + 2]);
        iowrite16(0, &card->dpram[DPRAM_FCT_PARAM + 4]);
        ret = softing_fct_cmd(card, 4, "set_mode[1]");
        if (ret < 0)
            goto failed;
        /* set filter2 */
        /* 11bit id & mask */
        iowrite16(0x0000, &card->dpram[DPRAM_FCT_PARAM + 2]);
        iowrite16(0x07ff, &card->dpram[DPRAM_FCT_PARAM + 4]);
        /* 29bit id.lo & mask.lo & id.hi & mask.hi */
        iowrite16(0x0000, &card->dpram[DPRAM_FCT_PARAM + 6]);
        iowrite16(0xffff, &card->dpram[DPRAM_FCT_PARAM + 8]);
        iowrite16(0x0000, &card->dpram[DPRAM_FCT_PARAM + 10]);
        iowrite16(0x1fff, &card->dpram[DPRAM_FCT_PARAM + 12]);
        ret = softing_fct_cmd(card, 8, "set_filter[1]");
        if (ret < 0)
            goto failed;
        /* set output control2 */
        iowrite16(priv->output, &card->dpram[DPRAM_FCT_PARAM + 2]);
        ret = softing_fct_cmd(card, 6, "set_output[1]");
        if (ret < 0)
            goto failed;
    }
    /* enable_error_frame */
    /*
     * Error reporting is switched off at the moment since
     * the receiving of them is not yet 100% verified
     * This should be enabled sooner or later
     *
    if (error_reporting) {
        ret = softing_fct_cmd(card, 51, "enable_error_frame");
        if (ret < 0)
            goto failed;
    }
    */
    /* initialize interface */
    iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 2]);
    iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 4]);
    iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 6]);
    iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 8]);
    iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 10]);
    iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 12]);
    iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 14]);
    iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 16]);
    iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 18]);
    iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 20]);
    ret = softing_fct_cmd(card, 17, "initialize_interface");
    if (ret < 0)
        goto failed;
    /* enable_fifo */
    ret = softing_fct_cmd(card, 36, "enable_fifo");
    if (ret < 0)
        goto failed;
    /* enable fifo tx ack */
    ret = softing_fct_cmd(card, 13, "fifo_tx_ack[0]");
    if (ret < 0)
        goto failed;
    /* enable fifo tx ack2 */
    ret = softing_fct_cmd(card, 14, "fifo_tx_ack[1]");
    if (ret < 0)
        goto failed;
    /* start_chip */
    ret = softing_fct_cmd(card, 11, "start_chip");
    if (ret < 0)
        goto failed;
    iowrite8(0, &card->dpram[DPRAM_INFO_BUSSTATE]);
    iowrite8(0, &card->dpram[DPRAM_INFO_BUSSTATE2]);
    if (card->pdat->generation < 2) {
        iowrite8(0, &card->dpram[DPRAM_V2_IRQ_TOHOST]);
        /* flush the DPRAM caches */
        wmb();
    }

    softing_initialize_timestamp(card);

    /*
     * do socketcan notifications/status changes
     * from here, no errors should occur, or the failed: part
     * must be reviewed
     */
    memset(&msg, 0, sizeof(msg));
    msg.can_id = CAN_ERR_FLAG | CAN_ERR_RESTARTED;
    msg.can_dlc = CAN_ERR_DLC;
    for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
        if (!(bus_bitmask_start & (1 << j)))
            continue;
        netdev = card->net[j];
        if (!netdev)
            continue;
        priv = netdev_priv(netdev);
        priv->can.state = CAN_STATE_ERROR_ACTIVE;
        open_candev(netdev);
        if (dev != netdev) {
            /* notify other busses on the restart */
            softing_netdev_rx(netdev, &msg, ktime_set(0, 0));
            ++priv->can.can_stats.restarts;
        }
        netif_wake_queue(netdev);
    }

    /* enable interrupts */
    ret = softing_enable_irq(card, 1);
    if (ret)
        goto failed;
card_done:
    mutex_unlock(&card->fw.lock);
    return 0;
invalid:
    ret = -EINVAL;
failed:
    softing_enable_irq(card, 0);
    softing_reset_chip(card);
    mutex_unlock(&card->fw.lock);
    /* bring all other interfaces down */
    for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
        netdev = card->net[j];
        if (!netdev)
            continue;
        dev_close(netdev);
    }
    return ret;
}

int softing_default_output(struct net_device *netdev)
{
    struct softing_priv *priv = netdev_priv(netdev);
    struct softing *card = priv->card;

    switch (priv->chip) {
    case 1000:
        return (card->pdat->generation < 2) ? 0xfb : 0xfa;
    case 5:
        return 0x60;
    default:
        return 0x40;
    }
}