To increase code readability, use the same naming of the counters for
the TX FIFO as in the other drivers implementing the same algorithm.
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
---
drivers/net/can/at91_can.c | 56 +++++++++++++++++++++++-----------------------
1 file changed, 28 insertions(+), 28 deletions(-)
diff --git a/drivers/net/can/at91_can.c b/drivers/net/can/at91_can.c
index b94fb35dc59e..092652fd7352 100644
--- a/drivers/net/can/at91_can.c
+++ b/drivers/net/can/at91_can.c
@@ -154,8 +154,8 @@ struct at91_priv {
void __iomem *reg_base;
u32 reg_sr;
- unsigned int tx_next;
- unsigned int tx_echo;
+ unsigned int tx_head;
+ unsigned int tx_tail;
unsigned int rx_next;
struct at91_devtype_data devtype_data;
@@ -253,24 +253,24 @@ static inline unsigned int get_mb_tx_last(const struct at91_priv *priv)
return get_mb_tx_first(priv) + get_mb_tx_num(priv) - 1;
}
-static inline unsigned int get_next_prio_shift(const struct at91_priv *priv)
+static inline unsigned int get_head_prio_shift(const struct at91_priv *priv)
{
return get_mb_tx_shift(priv);
}
-static inline unsigned int get_next_prio_mask(const struct at91_priv *priv)
+static inline unsigned int get_head_prio_mask(const struct at91_priv *priv)
{
return 0xf << get_mb_tx_shift(priv);
}
-static inline unsigned int get_next_mb_mask(const struct at91_priv *priv)
+static inline unsigned int get_head_mb_mask(const struct at91_priv *priv)
{
return AT91_MB_MASK(get_mb_tx_shift(priv));
}
-static inline unsigned int get_next_mask(const struct at91_priv *priv)
+static inline unsigned int get_head_mask(const struct at91_priv *priv)
{
- return get_next_mb_mask(priv) | get_next_prio_mask(priv);
+ return get_head_mb_mask(priv) | get_head_prio_mask(priv);
}
static inline unsigned int get_irq_mb_rx(const struct at91_priv *priv)
@@ -285,19 +285,19 @@ static inline unsigned int get_irq_mb_tx(const struct at91_priv *priv)
~AT91_MB_MASK(get_mb_tx_first(priv));
}
-static inline unsigned int get_tx_next_mb(const struct at91_priv *priv)
+static inline unsigned int get_tx_head_mb(const struct at91_priv *priv)
{
- return (priv->tx_next & get_next_mb_mask(priv)) + get_mb_tx_first(priv);
+ return (priv->tx_head & get_head_mb_mask(priv)) + get_mb_tx_first(priv);
}
-static inline unsigned int get_tx_next_prio(const struct at91_priv *priv)
+static inline unsigned int get_tx_head_prio(const struct at91_priv *priv)
{
- return (priv->tx_next >> get_next_prio_shift(priv)) & 0xf;
+ return (priv->tx_head >> get_head_prio_shift(priv)) & 0xf;
}
-static inline unsigned int get_tx_echo_mb(const struct at91_priv *priv)
+static inline unsigned int get_tx_tail_mb(const struct at91_priv *priv)
{
- return (priv->tx_echo & get_next_mb_mask(priv)) + get_mb_tx_first(priv);
+ return (priv->tx_tail & get_head_mb_mask(priv)) + get_mb_tx_first(priv);
}
static inline u32 at91_read(const struct at91_priv *priv, enum at91_reg reg)
@@ -374,7 +374,7 @@ static void at91_setup_mailboxes(struct net_device *dev)
set_mb_mode_prio(priv, i, AT91_MB_MODE_TX, 0);
/* Reset tx and rx helper pointers */
- priv->tx_next = priv->tx_echo = 0;
+ priv->tx_head = priv->tx_tail = 0;
priv->rx_next = get_mb_rx_first(priv);
}
@@ -470,11 +470,11 @@ static void at91_chip_stop(struct net_device *dev, enum can_state state)
* stop sending, waiting for all messages to be delivered, then start
* again with mailbox AT91_MB_TX_FIRST prio 0.
*
- * We use the priv->tx_next as counter for the next transmission
+ * We use the priv->tx_head as counter for the next transmission
* mailbox, but without the offset AT91_MB_TX_FIRST. The lower bits
* encode the mailbox number, the upper 4 bits the mailbox priority:
*
- * priv->tx_next = (prio << get_next_prio_shift(priv)) |
+ * priv->tx_head = (prio << get_next_prio_shift(priv)) |
* (mb - get_mb_tx_first(priv));
*
*/
@@ -488,8 +488,8 @@ static netdev_tx_t at91_start_xmit(struct sk_buff *skb, struct net_device *dev)
if (can_dev_dropped_skb(dev, skb))
return NETDEV_TX_OK;
- mb = get_tx_next_mb(priv);
- prio = get_tx_next_prio(priv);
+ mb = get_tx_head_mb(priv);
+ prio = get_tx_head_prio(priv);
if (unlikely(!(at91_read(priv, AT91_MSR(mb)) & AT91_MSR_MRDY))) {
netif_stop_queue(dev);
@@ -521,15 +521,15 @@ static netdev_tx_t at91_start_xmit(struct sk_buff *skb, struct net_device *dev)
/* we have to stop the queue and deliver all messages in case
* of a prio+mb counter wrap around. This is the case if
- * tx_next buffer prio and mailbox equals 0.
+ * tx_head buffer prio and mailbox equals 0.
*
* also stop the queue if next buffer is still in use
* (== not ready)
*/
- priv->tx_next++;
- if (!(at91_read(priv, AT91_MSR(get_tx_next_mb(priv))) &
+ priv->tx_head++;
+ if (!(at91_read(priv, AT91_MSR(get_tx_head_mb(priv))) &
AT91_MSR_MRDY) ||
- (priv->tx_next & get_next_mask(priv)) == 0)
+ (priv->tx_head & get_head_mask(priv)) == 0)
netif_stop_queue(dev);
/* Enable interrupt for this mailbox */
@@ -849,11 +849,11 @@ static int at91_poll(struct napi_struct *napi, int quota)
/* theory of operation:
*
- * priv->tx_echo holds the number of the oldest can_frame put for
+ * priv->tx_tail holds the number of the oldest can_frame put for
* transmission into the hardware, but not yet ACKed by the CAN tx
* complete IRQ.
*
- * We iterate from priv->tx_echo to priv->tx_next and check if the
+ * We iterate from priv->tx_tail to priv->tx_head and check if the
* packet has been transmitted, echo it back to the CAN framework. If
* we discover a not yet transmitted package, stop looking for more.
*
@@ -866,8 +866,8 @@ static void at91_irq_tx(struct net_device *dev, u32 reg_sr)
/* masking of reg_sr not needed, already done by at91_irq */
- for (/* nix */; (priv->tx_next - priv->tx_echo) > 0; priv->tx_echo++) {
- mb = get_tx_echo_mb(priv);
+ for (/* nix */; (priv->tx_head - priv->tx_tail) > 0; priv->tx_tail++) {
+ mb = get_tx_tail_mb(priv);
/* no event in mailbox? */
if (!(reg_sr & (1 << mb)))
@@ -896,8 +896,8 @@ static void at91_irq_tx(struct net_device *dev, u32 reg_sr)
* we get a TX int for the last can frame directly before a
* wrap around.
*/
- if ((priv->tx_next & get_next_mask(priv)) != 0 ||
- (priv->tx_echo & get_next_mask(priv)) == 0)
+ if ((priv->tx_head & get_head_mask(priv)) != 0 ||
+ (priv->tx_tail & get_head_mask(priv)) == 0)
netif_wake_queue(dev);
}
--
2.40.1
