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can: flexcan: Consolidate and unify state change handling 

Replacing error state change handling with the new mechanism.

Signed-off-by: Andri Yngvason <andri.yngvason@marel.com>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Andri Yngvason 2014-12-03 17:54:15 +00:00 committed by Marc Kleine-Budde
parent b12a43e6dd
commit 71a3aedce6
1 changed files with 18 additions and 83 deletions
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101
drivers/net/can/flexcan.c
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@ -577,98 +577,30 @@ static int flexcan_poll_bus_err(struct net_device *dev, u32 reg_esr)
return 1;
}
static void do_state(struct net_device *dev,
struct can_frame *cf, enum can_state new_state)
{
struct flexcan_priv *priv = netdev_priv(dev);
struct can_berr_counter bec;
__flexcan_get_berr_counter(dev, &bec);
switch (priv->can.state) {
case CAN_STATE_ERROR_ACTIVE:
/*
* from: ERROR_ACTIVE
* to : ERROR_WARNING, ERROR_PASSIVE, BUS_OFF
* => : there was a warning int
*/
if (new_state >= CAN_STATE_ERROR_WARNING &&
new_state <= CAN_STATE_BUS_OFF) {
netdev_dbg(dev, "Error Warning IRQ\n");
priv->can.can_stats.error_warning++;
cf->can_id |= CAN_ERR_CRTL;
cf->data[1] = (bec.txerr > bec.rxerr) ?
CAN_ERR_CRTL_TX_WARNING :
CAN_ERR_CRTL_RX_WARNING;
}
case CAN_STATE_ERROR_WARNING: /* fallthrough */
/*
* from: ERROR_ACTIVE, ERROR_WARNING
* to : ERROR_PASSIVE, BUS_OFF
* => : error passive int
*/
if (new_state >= CAN_STATE_ERROR_PASSIVE &&
new_state <= CAN_STATE_BUS_OFF) {
netdev_dbg(dev, "Error Passive IRQ\n");
priv->can.can_stats.error_passive++;
cf->can_id |= CAN_ERR_CRTL;
cf->data[1] = (bec.txerr > bec.rxerr) ?
CAN_ERR_CRTL_TX_PASSIVE :
CAN_ERR_CRTL_RX_PASSIVE;
}
break;
case CAN_STATE_BUS_OFF:
netdev_err(dev, "BUG! "
"hardware recovered automatically from BUS_OFF\n");
break;
default:
break;
}
/* process state changes depending on the new state */
switch (new_state) {
case CAN_STATE_ERROR_WARNING:
netdev_dbg(dev, "Error Warning\n");
cf->can_id |= CAN_ERR_CRTL;
cf->data[1] = (bec.txerr > bec.rxerr) ?
CAN_ERR_CRTL_TX_WARNING :
CAN_ERR_CRTL_RX_WARNING;
break;
case CAN_STATE_ERROR_ACTIVE:
netdev_dbg(dev, "Error Active\n");
cf->can_id |= CAN_ERR_PROT;
cf->data[2] = CAN_ERR_PROT_ACTIVE;
break;
case CAN_STATE_BUS_OFF:
cf->can_id |= CAN_ERR_BUSOFF;
can_bus_off(dev);
break;
default:
break;
}
}
static int flexcan_poll_state(struct net_device *dev, u32 reg_esr)
{
struct flexcan_priv *priv = netdev_priv(dev);
struct sk_buff *skb;
struct can_frame *cf;
enum can_state new_state;
enum can_state new_state = 0, rx_state = 0, tx_state = 0;
int flt;
struct can_berr_counter bec;
flt = reg_esr & FLEXCAN_ESR_FLT_CONF_MASK;
if (likely(flt == FLEXCAN_ESR_FLT_CONF_ACTIVE)) {
if (likely(!(reg_esr & (FLEXCAN_ESR_TX_WRN |
FLEXCAN_ESR_RX_WRN))))
new_state = CAN_STATE_ERROR_ACTIVE;
else
new_state = CAN_STATE_ERROR_WARNING;
} else if (unlikely(flt == FLEXCAN_ESR_FLT_CONF_PASSIVE))
tx_state = unlikely(reg_esr & FLEXCAN_ESR_TX_WRN) ?
CAN_STATE_ERROR_WARNING : CAN_STATE_ERROR_ACTIVE;
rx_state = unlikely(reg_esr & FLEXCAN_ESR_RX_WRN) ?
CAN_STATE_ERROR_WARNING : CAN_STATE_ERROR_ACTIVE;
new_state = max(tx_state, rx_state);
} else if (unlikely(flt == FLEXCAN_ESR_FLT_CONF_PASSIVE)) {
__flexcan_get_berr_counter(dev, &bec);
new_state = CAN_STATE_ERROR_PASSIVE;
else
rx_state = bec.rxerr >= bec.txerr ? new_state : 0;
tx_state = bec.rxerr <= bec.txerr ? new_state : 0;
} else {
new_state = CAN_STATE_BUS_OFF;
}
/* state hasn't changed */
if (likely(new_state == priv->can.state))
@ -678,8 +610,11 @@ static int flexcan_poll_state(struct net_device *dev, u32 reg_esr)
if (unlikely(!skb))
return 0;
do_state(dev, cf, new_state);
priv->can.state = new_state;
can_change_state(dev, cf, tx_state, rx_state);
if (unlikely(new_state == CAN_STATE_BUS_OFF))
can_bus_off(dev);
netif_receive_skb(skb);
dev->stats.rx_packets++;