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authorMarc Kleine-Budde <mkl@pengutronix.de>2015-07-12 00:47:47 +0200
committerMarc Kleine-Budde <mkl@pengutronix.de>2017-02-06 15:13:37 +0100
commitb93917c3700636dadc6688144e7d55e07699367b (patch)
treea9045f461f97712afa4ed6208496c3a9f70ef74c /drivers/net/can/flexcan.c
parent28ac7dcd5b1354e46f5f28a53b5a6b443fcc88ed (diff)
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: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'drivers/net/can/flexcan.c')
-rw-r--r--drivers/net/can/flexcan.c42
1 files changed, 24 insertions, 18 deletions
diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index 0a00a6dd7994..1a7df29a0f32 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -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);