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can: mscan: 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 17:54:14 +00:00 committed by Marc Kleine-Budde
parent 215db1856e
commit b12a43e6dd
1 changed files with 14 additions and 34 deletions
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48
drivers/net/can/mscan/mscan.c
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@ -289,18 +289,15 @@ static netdev_tx_t mscan_start_xmit(struct sk_buff *skb, struct net_device *dev)
return NETDEV_TX_OK;
}
/* This function returns the old state to see where we came from */
static enum can_state check_set_state(struct net_device *dev, u8 canrflg)
static enum can_state get_new_state(struct net_device *dev, u8 canrflg)
{
struct mscan_priv *priv = netdev_priv(dev);
enum can_state state, old_state = priv->can.state;
if (canrflg & MSCAN_CSCIF && old_state <= CAN_STATE_BUS_OFF) {
state = state_map[max(MSCAN_STATE_RX(canrflg),
MSCAN_STATE_TX(canrflg))];
priv->can.state = state;
}
return old_state;
if (unlikely(canrflg & MSCAN_CSCIF))
return state_map[max(MSCAN_STATE_RX(canrflg),
MSCAN_STATE_TX(canrflg))];
return priv->can.state;
}
static void mscan_get_rx_frame(struct net_device *dev, struct can_frame *frame)
@ -349,7 +346,7 @@ static void mscan_get_err_frame(struct net_device *dev, struct can_frame *frame,
struct mscan_priv *priv = netdev_priv(dev);
struct mscan_regs __iomem *regs = priv->reg_base;
struct net_device_stats *stats = &dev->stats;
enum can_state old_state;
enum can_state new_state;
netdev_dbg(dev, "error interrupt (canrflg=%#x)\n", canrflg);
frame->can_id = CAN_ERR_FLAG;
@ -363,27 +360,13 @@ static void mscan_get_err_frame(struct net_device *dev, struct can_frame *frame,
frame->data[1] = 0;
}
old_state = check_set_state(dev, canrflg);
/* State changed */
if (old_state != priv->can.state) {
switch (priv->can.state) {
case CAN_STATE_ERROR_WARNING:
frame->can_id |= CAN_ERR_CRTL;
priv->can.can_stats.error_warning++;
if ((priv->shadow_statflg & MSCAN_RSTAT_MSK) <
(canrflg & MSCAN_RSTAT_MSK))
frame->data[1] |= CAN_ERR_CRTL_RX_WARNING;
if ((priv->shadow_statflg & MSCAN_TSTAT_MSK) <
(canrflg & MSCAN_TSTAT_MSK))
frame->data[1] |= CAN_ERR_CRTL_TX_WARNING;
break;
case CAN_STATE_ERROR_PASSIVE:
frame->can_id |= CAN_ERR_CRTL;
priv->can.can_stats.error_passive++;
frame->data[1] |= CAN_ERR_CRTL_RX_PASSIVE;
break;
case CAN_STATE_BUS_OFF:
frame->can_id |= CAN_ERR_BUSOFF;
new_state = get_new_state(dev, canrflg);
if (new_state != priv->can.state) {
can_change_state(dev, frame,
state_map[MSCAN_STATE_TX(canrflg)],
state_map[MSCAN_STATE_RX(canrflg)]);
if (priv->can.state == CAN_STATE_BUS_OFF) {
/*
* The MSCAN on the MPC5200 does recover from bus-off
* automatically. To avoid that we stop the chip doing
@ -396,9 +379,6 @@ static void mscan_get_err_frame(struct net_device *dev, struct can_frame *frame,
MSCAN_SLPRQ | MSCAN_INITRQ);
}
can_bus_off(dev);
break;
default:
break;
}
}
priv->shadow_statflg = canrflg & MSCAN_STAT_MSK;