static irqreturn_t if_cs_interrupt(int irq, void *data)
{
struct if_cs_card *card = data;
struct lbs_private *priv = card->priv;
u16 cause;
lbs_deb_enter(LBS_DEB_CS);
/* Ask card interrupt cause register if there is something for us */
cause = if_cs_read16(card, IF_CS_CARD_INT_CAUSE);
lbs_deb_cs("cause 0x%04x\n", cause);
if (cause == 0) {
/* Not for us */
return IRQ_NONE;
}
if (cause == 0xffff) {
/* Read in junk, the card has probably been removed */
card->priv->surpriseremoved = 1;
return IRQ_HANDLED;
}
if (cause & IF_CS_BIT_RX) {
struct sk_buff *skb;
lbs_deb_cs("rx packet\n");
skb = if_cs_receive_data(priv);
if (skb)
lbs_process_rxed_packet(priv, skb);
}
if (cause & IF_CS_BIT_TX) {
lbs_deb_cs("tx done\n");
lbs_host_to_card_done(priv);
}
if (cause & IF_CS_BIT_RESP) {
unsigned long flags;
u8 i;
lbs_deb_cs("cmd resp\n");
spin_lock_irqsave(&priv->driver_lock, flags);
i = (priv->resp_idx == 0) ? 1 : 0;
spin_unlock_irqrestore(&priv->driver_lock, flags);
BUG_ON(priv->resp_len[i]);
if_cs_receive_cmdres(priv, priv->resp_buf[i],
&priv->resp_len[i]);
spin_lock_irqsave(&priv->driver_lock, flags);
lbs_notify_command_response(priv, i);
spin_unlock_irqrestore(&priv->driver_lock, flags);
}
if (cause & IF_CS_BIT_EVENT) {
u16 status = if_cs_read16(priv->card, IF_CS_CARD_STATUS);
if_cs_write16(priv->card, IF_CS_HOST_INT_CAUSE,
IF_CS_BIT_EVENT);
lbs_queue_event(priv, (status & IF_CS_CARD_STATUS_MASK) >> 8);
}
static struct sk_buff *if_cs_receive_data(struct lbs_private *priv)
{
struct sk_buff *skb = NULL;
u16 len;
u8 *data;
lbs_deb_enter(LBS_DEB_CS);
len = if_cs_read16(priv->card, IF_CS_READ_LEN);
if (len == 0 || len > MRVDRV_ETH_RX_PACKET_BUFFER_SIZE) {
lbs_pr_err("card data buffer has invalid # of bytes (%d)\n", len);
priv->dev->stats.rx_dropped++;
goto dat_err;
}
skb = dev_alloc_skb(MRVDRV_ETH_RX_PACKET_BUFFER_SIZE + 2);
if (!skb)
goto out;
skb_put(skb, len);
skb_reserve(skb, 2);/* 16 byte align */
data = skb->data;
/* read even number of bytes, then odd byte if necessary */
if_cs_read16_rep(priv->card, IF_CS_READ, data, len/sizeof(u16));
if (len & 1)
data[len-1] = if_cs_read8(priv->card, IF_CS_READ);
dat_err:
if_cs_write16(priv->card, IF_CS_HOST_STATUS, IF_CS_BIT_RX);
if_cs_write16(priv->card, IF_CS_HOST_INT_CAUSE, IF_CS_BIT_RX);
out:
lbs_deb_leave_args(LBS_DEB_CS, "ret %p", skb);
return skb;
}
/*
* Get the command result out of the card.
*/
static int if_cs_receive_cmdres(struct lbs_private *priv, u8 *data, u32 *len)
{
unsigned long flags;
int ret = -1;
u16 status;
lbs_deb_enter(LBS_DEB_CS);
/* is hardware ready? */
status = if_cs_read16(priv->card, IF_CS_CARD_STATUS);
if ((status & IF_CS_BIT_RESP) == 0) {
netdev_err(priv->dev, "no cmd response in card\n");
*len = 0;
goto out;
}
*len = if_cs_read16(priv->card, IF_CS_RESP_LEN);
if ((*len == 0) || (*len > LBS_CMD_BUFFER_SIZE)) {
netdev_err(priv->dev,
"card cmd buffer has invalid # of bytes (%d)\n",
*len);
goto out;
}
/* read even number of bytes, then odd byte if necessary */
if_cs_read16_rep(priv->card, IF_CS_RESP, data, *len/sizeof(u16));
if (*len & 1)
data[*len-1] = if_cs_read8(priv->card, IF_CS_RESP);
/* This is a workaround for a firmware that reports too much
* bytes */
*len -= 8;
ret = 0;
/* Clear this flag again */
spin_lock_irqsave(&priv->driver_lock, flags);
priv->dnld_sent = DNLD_RES_RECEIVED;
spin_unlock_irqrestore(&priv->driver_lock, flags);
out:
lbs_deb_leave_args(LBS_DEB_CS, "ret %d, len %d", ret, *len);
return ret;
}
/*
* Called from if_cs_host_to_card to send a command to the hardware
*/
static int if_cs_send_cmd(struct lbs_private *priv, u8 *buf, u16 nb)
{
struct if_cs_card *card = (struct if_cs_card *)priv->card;
int ret = -1;
int loops = 0;
lbs_deb_enter(LBS_DEB_CS);
if_cs_disable_ints(card);
/* Is hardware ready? */
while (1) {
u16 status = if_cs_read16(card, IF_CS_CARD_STATUS);
if (status & IF_CS_BIT_COMMAND)
break;
if (++loops > 100) {
lbs_pr_err("card not ready for commands\n");
goto done;
}
mdelay(1);
}
if_cs_write16(card, IF_CS_CMD_LEN, nb);
if_cs_write16_rep(card, IF_CS_CMD, buf, nb / 2);
/* Are we supposed to transfer an odd amount of bytes? */
if (nb & 1)
if_cs_write8(card, IF_CS_CMD, buf[nb-1]);
/* "Assert the download over interrupt command in the Host
* status register" */
if_cs_write16(card, IF_CS_HOST_STATUS, IF_CS_BIT_COMMAND);
/* "Assert the download over interrupt command in the Card
* interrupt case register" */
if_cs_write16(card, IF_CS_HOST_INT_CAUSE, IF_CS_BIT_COMMAND);
ret = 0;
done:
if_cs_enable_ints(card);
lbs_deb_leave_args(LBS_DEB_CS, "ret %d", ret);
return ret;
}
/*
* Called from if_cs_host_to_card to send a data to the hardware
*/
static void if_cs_send_data(struct lbs_private *priv, u8 *buf, u16 nb)
{
struct if_cs_card *card = (struct if_cs_card *)priv->card;
u16 status;
lbs_deb_enter(LBS_DEB_CS);
if_cs_disable_ints(card);
status = if_cs_read16(card, IF_CS_CARD_STATUS);
BUG_ON((status & IF_CS_BIT_TX) == 0);
if_cs_write16(card, IF_CS_WRITE_LEN, nb);
/* write even number of bytes, then odd byte if necessary */
if_cs_write16_rep(card, IF_CS_WRITE, buf, nb / 2);
if (nb & 1)
if_cs_write8(card, IF_CS_WRITE, buf[nb-1]);
if_cs_write16(card, IF_CS_HOST_STATUS, IF_CS_BIT_TX);
if_cs_write16(card, IF_CS_HOST_INT_CAUSE, IF_CS_BIT_TX);
if_cs_enable_ints(card);
lbs_deb_leave(LBS_DEB_CS);
}