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Commit b93917c3 authored by Marc Kleine-Budde's avatar Marc Kleine-Budde
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can: flexcan: make TX mailbox selectable during runtime 



This patch makes the TX mailbox selectable duing runtime. This is a preparation
patch to use of the hardware FIFO selectable via runtime. As the TX mailbox
number is different in HW FIFO and normal mode.

Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
parent 28ac7dcd

drivers/net/can/flexcan.c

+24 −18
Original line number Diff line number Diff line
@@ -143,9 +143,9 @@ 


/* FLEXCAN interrupt flag register (IFLAG) bits */

/* Errata ERR005829 step7: Reserve first valid MB */

#define FLEXCAN_TX_BUF_RESERVED		8

#define FLEXCAN_TX_BUF_ID		9

#define FLEXCAN_IFLAG_BUF(x)		BIT(x)

#define FLEXCAN_TX_MB_RESERVED_OFF_FIFO	8

#define FLEXCAN_TX_MB_OFF_FIFO		9

#define FLEXCAN_IFLAG_MB(x)		BIT(x)

#define FLEXCAN_IFLAG_RX_FIFO_OVERFLOW	BIT(7)

#define FLEXCAN_IFLAG_RX_FIFO_WARN	BIT(6)

#define FLEXCAN_IFLAG_RX_FIFO_AVAILABLE	BIT(5)
@@ -256,6 +256,9 @@ struct flexcan_priv { 
	struct napi_struct napi;



	struct flexcan_regs __iomem *regs;

	struct flexcan_mb __iomem *tx_mb;

	struct flexcan_mb __iomem *tx_mb_reserved;

	u8 tx_mb_idx;

	u32 reg_esr;

	u32 reg_ctrl_default;

	u32 reg_imask1_default;
@@ -472,7 +475,6 @@ static int flexcan_get_berr_counter(const struct net_device *dev, 
static int flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev)

{

	const struct flexcan_priv *priv = netdev_priv(dev);

	struct flexcan_regs __iomem *regs = priv->regs;

	struct can_frame *cf = (struct can_frame *)skb->data;

	u32 can_id;

	u32 data;
@@ -495,25 +497,25 @@ static int flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev) 


	if (cf->can_dlc > 0) {

		data = be32_to_cpup((__be32 *)&cf->data[0]);

		flexcan_write(data, &regs->mb[FLEXCAN_TX_BUF_ID].data[0]);

		flexcan_write(data, &priv->tx_mb->data[0]);

	}

	if (cf->can_dlc > 3) {

		data = be32_to_cpup((__be32 *)&cf->data[4]);

		flexcan_write(data, &regs->mb[FLEXCAN_TX_BUF_ID].data[1]);

		flexcan_write(data, &priv->tx_mb->data[1]);

	}



	can_put_echo_skb(skb, dev, 0);



	flexcan_write(can_id, &regs->mb[FLEXCAN_TX_BUF_ID].can_id);

	flexcan_write(ctrl, &regs->mb[FLEXCAN_TX_BUF_ID].can_ctrl);

	flexcan_write(can_id, &priv->tx_mb->can_id);

	flexcan_write(ctrl, &priv->tx_mb->can_ctrl);



	/* Errata ERR005829 step8:

	 * Write twice INACTIVE(0x8) code to first MB.

	 */

	flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE,

		      &regs->mb[FLEXCAN_TX_BUF_RESERVED].can_ctrl);

		      &priv->tx_mb_reserved->can_ctrl);

	flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE,

		      &regs->mb[FLEXCAN_TX_BUF_RESERVED].can_ctrl);

		      &priv->tx_mb_reserved->can_ctrl);



	return NETDEV_TX_OK;

}
@@ -750,7 +752,7 @@ static irqreturn_t flexcan_irq(int irq, void *dev_id) 
	}



	/* transmission complete interrupt */

	if (reg_iflag1 & (1 << FLEXCAN_TX_BUF_ID)) {

	if (reg_iflag1 & FLEXCAN_IFLAG_MB(priv->tx_mb_idx)) {

		handled = IRQ_HANDLED;

		stats->tx_bytes += can_get_echo_skb(dev, 0);

		stats->tx_packets++;
@@ -758,8 +760,8 @@ static irqreturn_t flexcan_irq(int irq, void *dev_id) 


		/* after sending a RTR frame MB is in RX mode */

		flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE,

			      &regs->mb[FLEXCAN_TX_BUF_ID].can_ctrl);

		flexcan_write((1 << FLEXCAN_TX_BUF_ID), &regs->iflag1);

			      &priv->tx_mb->can_ctrl);

		flexcan_write(FLEXCAN_IFLAG_MB(priv->tx_mb_idx), &regs->iflag1);

		netif_wake_queue(dev);

	}
@@ -849,7 +851,7 @@ static int flexcan_chip_start(struct net_device *dev) 
	reg_mcr &= ~FLEXCAN_MCR_MAXMB(0xff);

	reg_mcr |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_FEN | FLEXCAN_MCR_HALT |

		FLEXCAN_MCR_SUPV | FLEXCAN_MCR_WRN_EN | FLEXCAN_MCR_SRX_DIS |

		FLEXCAN_MCR_IDAM_C | FLEXCAN_MCR_MAXMB(FLEXCAN_TX_BUF_ID);

		FLEXCAN_MCR_IDAM_C | FLEXCAN_MCR_MAXMB(priv->tx_mb_idx);

	netdev_dbg(dev, "%s: writing mcr=0x%08x", __func__, reg_mcr);

	flexcan_write(reg_mcr, &regs->mcr);
@@ -887,18 +889,18 @@ static int flexcan_chip_start(struct net_device *dev) 
	flexcan_write(reg_ctrl, &regs->ctrl);



	/* clear and invalidate all mailboxes first */

	for (i = FLEXCAN_TX_BUF_ID; i < ARRAY_SIZE(regs->mb); i++) {

	for (i = priv->tx_mb_idx; i < ARRAY_SIZE(regs->mb); i++) {

		flexcan_write(FLEXCAN_MB_CODE_RX_INACTIVE,

			      &regs->mb[i].can_ctrl);

	}



	/* Errata ERR005829: mark first TX mailbox as INACTIVE */

	flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE,

		      &regs->mb[FLEXCAN_TX_BUF_RESERVED].can_ctrl);

		      &priv->tx_mb_reserved->can_ctrl);



	/* mark TX mailbox as INACTIVE */

	flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE,

		      &regs->mb[FLEXCAN_TX_BUF_ID].can_ctrl);

		      &priv->tx_mb->can_ctrl);



	/* acceptance mask/acceptance code (accept everything) */

	flexcan_write(0x0, &regs->rxgmask);
@@ -1229,9 +1231,13 @@ static int flexcan_probe(struct platform_device *pdev) 
	priv->devtype_data = devtype_data;

	priv->reg_xceiver = reg_xceiver;



	priv->tx_mb_idx = FLEXCAN_TX_MB_OFF_FIFO;

	priv->tx_mb_reserved = &regs->mb[FLEXCAN_TX_MB_RESERVED_OFF_FIFO];

	priv->tx_mb = &regs->mb[priv->tx_mb_idx];



	priv->reg_imask1_default = FLEXCAN_IFLAG_RX_FIFO_OVERFLOW |

		FLEXCAN_IFLAG_RX_FIFO_AVAILABLE |

		FLEXCAN_IFLAG_BUF(FLEXCAN_TX_BUF_ID);

		FLEXCAN_IFLAG_MB(priv->tx_mb_idx);



	netif_napi_add(dev, &priv->napi, flexcan_poll, FLEXCAN_NAPI_WEIGHT);