[RFC 3/4] [flexcan] Add support for FLEXCAN_DEBUG

@@ -220,6 +220,35 @@ static inline void flexcan_write(u32 val, void __iomem *addr)
 }
 #endif
 
+#if defined(FLEXCAN_DEBUG)
+void _flexcan_reg_dump(struct net_device *dev, const char *file, int line,
+		       const char *func)
+{
+	const struct flexcan_priv *priv = netdev_priv(dev);
+	struct flexcan_regs __iomem *regs = priv->base;
+
+	netdev_info("flexcan_reg_dump:%s:%d:%s()\n", file, line, func);
+	netdev_info("\t  mcr 0x%08x  ctrl 0x%08x timer 0x%08x   rxg 0x%08x",
+		flexcan_read(&regs->mcr),
+		flexcan_read(&regs->ctrl),
+		flexcan_read(&regs->timer),
+		flexcan_read(&regs->rxgmask));
+	netdev_info("\t rx14 0x%08x  rx15 0x%08x   ecr 0x%08x   esr 0x%08x",
+		flexcan_read(&regs->rx14mask),
+		flexcan_read(&regs->rx15mask),
+		flexcan_read(&regs->ecr),
+		flexcan_read(&regs->esr));
+	netdev_info("\timsk2 0x%08x imsk1 0x%08x iflg2 0x%08x iflg1 0x%08x",
+		flexcan_read(&regs->imask2),
+		flexcan_read(&regs->imask1),
+		flexcan_read(&regs->iflag2),
+		flexcan_read(&regs->iflag1));
+}
+#define flexcan_reg_dump(_d) _flexcan_reg_dump(_d, __FILE__, __LINE__, __func__)
+#else
+#define flexcan_reg_dump(_d)
+#endif
+
 /*
  * Swtich transceiver on or off
  */

@@ -280,6 +309,8 @@ static int flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	u32 can_id;
 	u32 ctrl = FLEXCAN_MB_CNT_CODE(0xc) | (cf->can_dlc << 16);
 
+	flexcan_reg_dump(dev);
+
 	if (can_dropped_invalid_skb(dev, skb))
 		return NETDEV_TX_OK;
 

@@ -312,6 +343,8 @@ static int flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	/* tx_packets is incremented in flexcan_irq */
 	stats->tx_bytes += cf->can_dlc;
 
+	flexcan_reg_dump(dev);
+
 	return NETDEV_TX_OK;
 }
 

@@ -580,6 +613,8 @@ static irqreturn_t flexcan_irq(int irq, void *dev_id)
 	struct flexcan_regs __iomem *regs = priv->base;
 	u32 reg_iflag1, reg_esr;
 
+	flexcan_reg_dump(dev);
+
 	reg_iflag1 = flexcan_read(&regs->iflag1);
 	reg_esr = flexcan_read(&regs->esr);
 	flexcan_write(FLEXCAN_ESR_ERR_INT, &regs->esr);	/* ACK err IRQ */

@@ -620,6 +655,8 @@ static irqreturn_t flexcan_irq(int irq, void *dev_id)
 		netif_wake_queue(dev);
 	}
 
+	flexcan_reg_dump(dev);
+
 	return IRQ_HANDLED;
 }