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can: EG20T PCH: Change Message Object Index 

For easy to readable, add Message Object index like below.
PCH_RX_OBJ_START
PCH_RX_OBJ_END
PCH_TX_OBJ_START
PCH_TX_OBJ_END

Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tomoya 2010-11-29 18:15:02 +00:00 committed by David S. Miller
parent 8339a7ed56
commit 15ffc8fddf
1 changed files with 114 additions and 145 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

259
drivers/net/can/pch_can.c
View File

@ -32,10 +32,6 @@
#include <linux/can/dev.h>
#include <linux/can/error.h>
#define PCH_MAX_MSG_OBJ 32
#define PCH_MSG_OBJ_RX 0 /* The receive message object flag. */
#define PCH_MSG_OBJ_TX 1 /* The transmit message object flag. */
#define PCH_ENABLE 1 /* The enable flag */
#define PCH_DISABLE 0 /* The disable flag */
#define PCH_CTRL_INIT BIT(0) /* The INIT bit of CANCONT register. */
@ -107,9 +103,12 @@
/* Define the number of message object.
* PCH CAN communications are done via Message RAM.
* The Message RAM consists of 32 message objects. */
#define PCH_RX_OBJ_NUM 26 /* 1~ PCH_RX_OBJ_NUM is Rx*/
#define PCH_TX_OBJ_NUM 6 /* PCH_RX_OBJ_NUM is RX ~ Tx*/
#define PCH_OBJ_NUM (PCH_TX_OBJ_NUM + PCH_RX_OBJ_NUM)
#define PCH_RX_OBJ_NUM 26
#define PCH_TX_OBJ_NUM 6
#define PCH_RX_OBJ_START 1
#define PCH_RX_OBJ_END PCH_RX_OBJ_NUM
#define PCH_TX_OBJ_START (PCH_RX_OBJ_END + 1)
#define PCH_TX_OBJ_END (PCH_RX_OBJ_NUM + PCH_TX_OBJ_NUM)
#define PCH_FIFO_THRESH 16
@ -172,14 +171,14 @@ struct pch_can_priv {
struct can_priv can;
unsigned int can_num;
struct pci_dev *dev;
unsigned int tx_enable[PCH_MAX_MSG_OBJ];
unsigned int rx_enable[PCH_MAX_MSG_OBJ];
unsigned int rx_link[PCH_MAX_MSG_OBJ];
int tx_enable[PCH_TX_OBJ_END];
int rx_enable[PCH_TX_OBJ_END];
int rx_link[PCH_TX_OBJ_END];
unsigned int int_enables;
unsigned int int_stat;
struct net_device *ndev;
spinlock_t msgif_reg_lock; /* Message Interface Registers Access Lock*/
unsigned int msg_obj[PCH_MAX_MSG_OBJ];
unsigned int msg_obj[PCH_TX_OBJ_END];
struct pch_can_regs __iomem *regs;
struct napi_struct napi;
unsigned int tx_obj; /* Point next Tx Obj index */
@ -347,10 +346,8 @@ static void pch_can_set_rx_all(struct pch_can_priv *priv, u32 set)
int i;
/* Traversing to obtain the object configured as receivers. */
for (i = 0; i < PCH_OBJ_NUM; i++) {
if (priv->msg_obj[i] == PCH_MSG_OBJ_RX)
pch_can_set_rxtx(priv, i + 1, set, PCH_RX_IFREG);
}
for (i = PCH_RX_OBJ_START; i <= PCH_RX_OBJ_END; i++)
pch_can_set_rxtx(priv, i, set, PCH_RX_IFREG);
}
static void pch_can_set_tx_all(struct pch_can_priv *priv, u32 set)
@ -358,10 +355,8 @@ static void pch_can_set_tx_all(struct pch_can_priv *priv, u32 set)
int i;
/* Traversing to obtain the object configured as transmit object. */
for (i = 0; i < PCH_OBJ_NUM; i++) {
if (priv->msg_obj[i] == PCH_MSG_OBJ_TX)
pch_can_set_rxtx(priv, i + 1, set, PCH_TX_IFREG);
}
for (i = PCH_TX_OBJ_START; i <= PCH_TX_OBJ_END; i++)
pch_can_set_rxtx(priv, i, set, PCH_TX_IFREG);
}
static u32 pch_can_get_rxtx_ir(struct pch_can_priv *priv, u32 buff_num,
@ -381,9 +376,9 @@ static u32 pch_can_get_rxtx_ir(struct pch_can_priv *priv, u32 buff_num,
if (((ioread32(&priv->regs->ifregs[dir].id2)) & PCH_ID_MSGVAL) &&
((ioread32(&priv->regs->ifregs[dir].mcont)) & ie)) {
enable = PCH_ENABLE;
enable = 1;
} else {
enable = PCH_DISABLE;
enable = 0;
}
spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
return enable;
@ -434,7 +429,7 @@ static void pch_can_clear_buffers(struct pch_can_priv *priv)
{
int i;
for (i = 0; i < PCH_RX_OBJ_NUM; i++) {
for (i = PCH_RX_OBJ_START; i <= PCH_RX_OBJ_END; i++) {
iowrite32(PCH_CMASK_RX_TX_SET, &priv->regs->ifregs[0].cmask);
iowrite32(0xffff, &priv->regs->ifregs[0].mask1);
iowrite32(0xffff, &priv->regs->ifregs[0].mask2);
@ -448,10 +443,10 @@ static void pch_can_clear_buffers(struct pch_can_priv *priv)
iowrite32(PCH_CMASK_RDWR | PCH_CMASK_MASK |
PCH_CMASK_ARB | PCH_CMASK_CTRL,
&priv->regs->ifregs[0].cmask);
pch_can_check_if_busy(&priv->regs->ifregs[0].creq, i+1);
pch_can_check_if_busy(&priv->regs->ifregs[0].creq, i);
}
for (i = i; i < PCH_OBJ_NUM; i++) {
for (i = PCH_TX_OBJ_START; i <= PCH_TX_OBJ_END; i++) {
iowrite32(PCH_CMASK_RX_TX_SET, &priv->regs->ifregs[1].cmask);
iowrite32(0xffff, &priv->regs->ifregs[1].mask1);
iowrite32(0xffff, &priv->regs->ifregs[1].mask2);
@ -465,7 +460,7 @@ static void pch_can_clear_buffers(struct pch_can_priv *priv)
iowrite32(PCH_CMASK_RDWR | PCH_CMASK_MASK |
PCH_CMASK_ARB | PCH_CMASK_CTRL,
&priv->regs->ifregs[1].cmask);
pch_can_check_if_busy(&priv->regs->ifregs[1].creq, i+1);
pch_can_check_if_busy(&priv->regs->ifregs[1].creq, i);
}
}
@ -476,64 +471,62 @@ static void pch_can_config_rx_tx_buffers(struct pch_can_priv *priv)
spin_lock_irqsave(&priv->msgif_reg_lock, flags);
for (i = 0; i < PCH_OBJ_NUM; i++) {
if (priv->msg_obj[i] == PCH_MSG_OBJ_RX) {
iowrite32(PCH_CMASK_RX_TX_GET,
&priv->regs->ifregs[0].cmask);
pch_can_check_if_busy(&priv->regs->ifregs[0].creq, i+1);
for (i = PCH_RX_OBJ_START; i <= PCH_RX_OBJ_END; i++) {
iowrite32(PCH_CMASK_RX_TX_GET,
&priv->regs->ifregs[0].cmask);
pch_can_check_if_busy(&priv->regs->ifregs[0].creq, i);
iowrite32(0x0, &priv->regs->ifregs[0].id1);
iowrite32(0x0, &priv->regs->ifregs[0].id2);
iowrite32(0x0, &priv->regs->ifregs[0].id1);
iowrite32(0x0, &priv->regs->ifregs[0].id2);
pch_can_bit_set(&priv->regs->ifregs[0].mcont,
PCH_IF_MCONT_UMASK);
/* Set FIFO mode set to 0 except last Rx Obj*/
pch_can_bit_clear(&priv->regs->ifregs[0].mcont,
PCH_IF_MCONT_EOB);
/* In case FIFO mode, Last EoB of Rx Obj must be 1 */
if (i == PCH_RX_OBJ_END)
pch_can_bit_set(&priv->regs->ifregs[0].mcont,
PCH_IF_MCONT_UMASK);
/* Set FIFO mode set to 0 except last Rx Obj*/
pch_can_bit_clear(&priv->regs->ifregs[0].mcont,
PCH_IF_MCONT_EOB);
/* In case FIFO mode, Last EoB of Rx Obj must be 1 */
if (i == (PCH_RX_OBJ_NUM - 1))
pch_can_bit_set(&priv->regs->ifregs[0].mcont,
PCH_IF_MCONT_EOB);
iowrite32(0, &priv->regs->ifregs[0].mask1);
pch_can_bit_clear(&priv->regs->ifregs[0].mask2,
0x1fff | PCH_MASK2_MDIR_MXTD);
iowrite32(0, &priv->regs->ifregs[0].mask1);
pch_can_bit_clear(&priv->regs->ifregs[0].mask2,
0x1fff | PCH_MASK2_MDIR_MXTD);
/* Setting CMASK for writing */
iowrite32(PCH_CMASK_RDWR | PCH_CMASK_MASK |
PCH_CMASK_ARB | PCH_CMASK_CTRL,
&priv->regs->ifregs[0].cmask);
/* Setting CMASK for writing */
iowrite32(PCH_CMASK_RDWR | PCH_CMASK_MASK |
PCH_CMASK_ARB | PCH_CMASK_CTRL,
&priv->regs->ifregs[0].cmask);
pch_can_check_if_busy(&priv->regs->ifregs[0].creq, i+1);
} else if (priv->msg_obj[i] == PCH_MSG_OBJ_TX) {
iowrite32(PCH_CMASK_RX_TX_GET,
&priv->regs->ifregs[1].cmask);
pch_can_check_if_busy(&priv->regs->ifregs[1].creq, i+1);
pch_can_check_if_busy(&priv->regs->ifregs[0].creq, i);
}
/* Resetting DIR bit for reception */
iowrite32(0x0, &priv->regs->ifregs[1].id1);
iowrite32(0x0, &priv->regs->ifregs[1].id2);
pch_can_bit_set(&priv->regs->ifregs[1].id2,
PCH_ID2_DIR);
for (i = PCH_TX_OBJ_START; i <= PCH_TX_OBJ_END; i++) {
iowrite32(PCH_CMASK_RX_TX_GET,
&priv->regs->ifregs[1].cmask);
pch_can_check_if_busy(&priv->regs->ifregs[1].creq, i);
/* Setting EOB bit for transmitter */
iowrite32(PCH_IF_MCONT_EOB,
&priv->regs->ifregs[1].mcont);
/* Resetting DIR bit for reception */
iowrite32(0x0, &priv->regs->ifregs[1].id1);
iowrite32(0x0, &priv->regs->ifregs[1].id2);
pch_can_bit_set(&priv->regs->ifregs[1].id2, PCH_ID2_DIR);
pch_can_bit_set(&priv->regs->ifregs[1].mcont,
PCH_IF_MCONT_UMASK);
/* Setting EOB bit for transmitter */
iowrite32(PCH_IF_MCONT_EOB, &priv->regs->ifregs[1].mcont);
iowrite32(0, &priv->regs->ifregs[1].mask1);
pch_can_bit_clear(&priv->regs->ifregs[1].mask2, 0x1fff);
pch_can_bit_set(&priv->regs->ifregs[1].mcont,
PCH_IF_MCONT_UMASK);
/* Setting CMASK for writing */
iowrite32(PCH_CMASK_RDWR | PCH_CMASK_MASK |
PCH_CMASK_ARB | PCH_CMASK_CTRL,
&priv->regs->ifregs[1].cmask);
iowrite32(0, &priv->regs->ifregs[1].mask1);
pch_can_bit_clear(&priv->regs->ifregs[1].mask2, 0x1fff);
pch_can_check_if_busy(&priv->regs->ifregs[1].creq, i+1);
}
/* Setting CMASK for writing */
iowrite32(PCH_CMASK_RDWR | PCH_CMASK_MASK |
PCH_CMASK_ARB | PCH_CMASK_CTRL,
&priv->regs->ifregs[1].cmask);
pch_can_check_if_busy(&priv->regs->ifregs[1].creq, i);
}
spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
}
@ -577,7 +570,20 @@ static void pch_can_int_clr(struct pch_can_priv *priv, u32 mask)
}
/* Clear interrupt for transmit object */
if (priv->msg_obj[mask - 1] == PCH_MSG_OBJ_TX) {
if ((mask >= PCH_RX_OBJ_START) && (mask <= PCH_RX_OBJ_END)) {
/* Setting CMASK for clearing the reception interrupts. */
iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL | PCH_CMASK_ARB,
&priv->regs->ifregs[0].cmask);
/* Clearing the Dir bit. */
pch_can_bit_clear(&priv->regs->ifregs[0].id2, PCH_ID2_DIR);
/* Clearing NewDat & IntPnd */
pch_can_bit_clear(&priv->regs->ifregs[0].mcont,
PCH_IF_MCONT_NEWDAT | PCH_IF_MCONT_INTPND);
pch_can_check_if_busy(&priv->regs->ifregs[0].creq, mask);
} else if ((mask >= PCH_TX_OBJ_START) && (mask <= PCH_TX_OBJ_END)) {
/* Setting CMASK for clearing interrupts for
frame transmission. */
iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL | PCH_CMASK_ARB,
@ -593,19 +599,6 @@ static void pch_can_int_clr(struct pch_can_priv *priv, u32 mask)
PCH_IF_MCONT_NEWDAT | PCH_IF_MCONT_INTPND |
PCH_IF_MCONT_TXRQXT);
pch_can_check_if_busy(&priv->regs->ifregs[1].creq, mask);
} else if (priv->msg_obj[mask - 1] == PCH_MSG_OBJ_RX) {
/* Setting CMASK for clearing the reception interrupts. */
iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL | PCH_CMASK_ARB,
&priv->regs->ifregs[0].cmask);
/* Clearing the Dir bit. */
pch_can_bit_clear(&priv->regs->ifregs[0].id2, PCH_ID2_DIR);
/* Clearing NewDat & IntPnd */
pch_can_bit_clear(&priv->regs->ifregs[0].mcont,
PCH_IF_MCONT_NEWDAT | PCH_IF_MCONT_INTPND);
pch_can_check_if_busy(&priv->regs->ifregs[0].creq, mask);
}
}
@ -793,8 +786,8 @@ static int pch_can_rx_normal(struct net_device *ndev, u32 int_stat)
cf->can_dlc = 0;
cf->can_id |= CAN_RTR_FLAG;
} else {
cf->can_dlc = ((ioread32(&priv->regs->ifregs[0].mcont))
& 0x0f);
cf->can_dlc =
((ioread32(&priv->regs->ifregs[0].mcont)) & 0x0f);
}
for (i = 0, j = 0; i < cf->can_dlc; j++) {
@ -832,7 +825,7 @@ static int pch_can_rx_normal(struct net_device *ndev, u32 int_stat)
RX_NEXT:
/* Reading the messsage object from the Message RAM */
iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[0].cmask);
pch_can_check_if_busy(&priv->regs->ifregs[0].creq, k + 1);
pch_can_check_if_busy(&priv->regs->ifregs[0].creq, k);
reg = ioread32(&priv->regs->ifregs[0].mcont);
}
@ -880,29 +873,27 @@ static int pch_can_rx_poll(struct napi_struct *napi, int quota)
}
MSG_OBJ:
if ((int_stat >= 1) && (int_stat <= PCH_RX_OBJ_NUM)) {
if ((int_stat >= PCH_RX_OBJ_START) && (int_stat <= PCH_RX_OBJ_END)) {
spin_lock_irqsave(&priv->msgif_reg_lock, flags);
rcv_pkts = pch_can_rx_normal(ndev, int_stat);
spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
if (rcv_pkts < 0)
return 0;
} else if ((int_stat > PCH_RX_OBJ_NUM) && (int_stat <= PCH_OBJ_NUM)) {
if (priv->msg_obj[int_stat - 1] == PCH_MSG_OBJ_TX) {
/* Handle transmission interrupt */
can_get_echo_skb(ndev, int_stat - PCH_RX_OBJ_NUM - 1);
spin_lock_irqsave(&priv->msgif_reg_lock, flags);
iowrite32(PCH_CMASK_RX_TX_GET | PCH_CMASK_CLRINTPND,
&priv->regs->ifregs[1].cmask);
dlc = ioread32(&priv->regs->ifregs[1].mcont) &
PCH_IF_MCONT_DLC;
pch_can_check_if_busy(&priv->regs->ifregs[1].creq,
int_stat);
spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
if (dlc > 8)
dlc = 8;
stats->tx_bytes += dlc;
stats->tx_packets++;
}
} else if ((int_stat >= PCH_TX_OBJ_START) &&
(int_stat <= PCH_TX_OBJ_END)) {
/* Handle transmission interrupt */
can_get_echo_skb(ndev, int_stat - PCH_RX_OBJ_END - 1);
spin_lock_irqsave(&priv->msgif_reg_lock, flags);
iowrite32(PCH_CMASK_RX_TX_GET | PCH_CMASK_CLRINTPND,
&priv->regs->ifregs[1].cmask);
dlc = ioread32(&priv->regs->ifregs[1].mcont) &
PCH_IF_MCONT_DLC;
pch_can_check_if_busy(&priv->regs->ifregs[1].creq, int_stat);
spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
if (dlc > 8)
dlc = 8;
stats->tx_bytes += dlc;
stats->tx_packets++;
}
int_stat = pch_can_int_pending(priv);
@ -1064,12 +1055,12 @@ static netdev_tx_t pch_xmit(struct sk_buff *skb, struct net_device *ndev)
if (can_dropped_invalid_skb(ndev, skb))
return NETDEV_TX_OK;
if (priv->tx_obj == (PCH_OBJ_NUM + 1)) { /* Point tail Obj */
if (priv->tx_obj == PCH_TX_OBJ_END) { /* Point tail Obj */
while (pch_get_msg_obj_sts(ndev, (((1 << PCH_TX_OBJ_NUM)-1) <<
PCH_RX_OBJ_NUM)))
udelay(500);
priv->tx_obj = PCH_RX_OBJ_NUM + 1; /* Point head of Tx Obj ID */
priv->tx_obj = PCH_TX_OBJ_START; /* Point head of Tx Obj ID */
tx_buffer_avail = priv->tx_obj; /* Point Tail of Tx Obj */
} else {
tx_buffer_avail = priv->tx_obj;
@ -1113,7 +1104,7 @@ static netdev_tx_t pch_xmit(struct sk_buff *skb, struct net_device *ndev)
(&priv->regs->ifregs[1].dataa1) + j*4);
}
can_put_echo_skb(skb, ndev, tx_buffer_avail - PCH_RX_OBJ_NUM - 1);
can_put_echo_skb(skb, ndev, tx_buffer_avail - PCH_RX_OBJ_END - 1);
/* Updating the size of the data. */
pch_can_bit_clear(&priv->regs->ifregs[1].mcont, 0x0f);
@ -1188,23 +1179,16 @@ static int pch_can_suspend(struct pci_dev *pdev, pm_message_t state)
pch_can_set_int_enables(priv, PCH_CAN_DISABLE);
/* Save Tx buffer enable state */
for (i = 0; i < PCH_OBJ_NUM; i++) {
if (priv->msg_obj[i] == PCH_MSG_OBJ_TX)
priv->tx_enable[i] = pch_can_get_rxtx_ir(priv, i + 1,
PCH_TX_IFREG);
}
for (i = PCH_TX_OBJ_START; i <= PCH_TX_OBJ_END; i++)
priv->tx_enable[i] = pch_can_get_rxtx_ir(priv, i, PCH_TX_IFREG);
/* Disable all Transmit buffers */
pch_can_set_tx_all(priv, 0);
/* Save Rx buffer enable state */
for (i = 0; i < PCH_OBJ_NUM; i++) {
if (priv->msg_obj[i] == PCH_MSG_OBJ_RX) {
priv->rx_enable[i] = pch_can_get_rxtx_ir(priv, i + 1,
PCH_RX_IFREG);
pch_can_get_rx_buffer_link(priv, i + 1,
&(priv->rx_link[i]));
}
for (i = PCH_RX_OBJ_START; i <= PCH_RX_OBJ_END; i++) {
priv->rx_enable[i] = pch_can_get_rxtx_ir(priv, i, PCH_RX_IFREG);
pch_can_get_rx_buffer_link(priv, i, &priv->rx_link[i]);
}
/* Disable all Receive buffers */
@ -1256,24 +1240,16 @@ static int pch_can_resume(struct pci_dev *pdev)
pch_can_set_optmode(priv);
/* Enabling the transmit buffer. */
for (i = 0; i < PCH_OBJ_NUM; i++) {
if (priv->msg_obj[i] == PCH_MSG_OBJ_TX)
pch_can_set_rxtx(priv, i, priv->tx_enable[i],
PCH_TX_IFREG);
}
for (i = PCH_TX_OBJ_START; i <= PCH_TX_OBJ_END; i++)
pch_can_set_rxtx(priv, i, priv->tx_enable[i], PCH_TX_IFREG);
/* Configuring the receive buffer and enabling them. */
for (i = 0; i < PCH_OBJ_NUM; i++) {
if (priv->msg_obj[i] == PCH_MSG_OBJ_RX) {
/* Restore buffer link */
pch_can_set_rx_buffer_link(priv, i + 1,
priv->rx_link[i]);
for (i = PCH_RX_OBJ_START; i <= PCH_RX_OBJ_END; i++) {
/* Restore buffer link */
pch_can_set_rx_buffer_link(priv, i, priv->rx_link[i]);
/* Restore buffer enables */
pch_can_set_rxtx(priv, i, priv->rx_enable[i],
PCH_RX_IFREG);
}
/* Restore buffer enables */
pch_can_set_rxtx(priv, i, priv->rx_enable[i], PCH_RX_IFREG);
}
/* Enable CAN Interrupts */
@ -1306,7 +1282,6 @@ static int __devinit pch_can_probe(struct pci_dev *pdev,
struct net_device *ndev;
struct pch_can_priv *priv;
int rc;
int index;
void __iomem *addr;
rc = pci_enable_device(pdev);
@ -1328,7 +1303,7 @@ static int __devinit pch_can_probe(struct pci_dev *pdev,
goto probe_exit_ipmap;
}
ndev = alloc_candev(sizeof(struct pch_can_priv), PCH_TX_OBJ_NUM);
ndev = alloc_candev(sizeof(struct pch_can_priv), PCH_TX_OBJ_END);
if (!ndev) {
rc = -ENOMEM;
dev_err(&pdev->dev, "Failed alloc_candev\n");
@ -1344,7 +1319,7 @@ static int __devinit pch_can_probe(struct pci_dev *pdev,
priv->can.do_get_berr_counter = pch_can_get_berr_counter;
priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY |
CAN_CTRLMODE_LOOPBACK;
priv->tx_obj = PCH_RX_OBJ_NUM + 1; /* Point head of Tx Obj */
priv->tx_obj = PCH_TX_OBJ_START; /* Point head of Tx Obj */
ndev->irq = pdev->irq;
ndev->flags |= IFF_ECHO;
@ -1352,15 +1327,9 @@ static int __devinit pch_can_probe(struct pci_dev *pdev,
pci_set_drvdata(pdev, ndev);
SET_NETDEV_DEV(ndev, &pdev->dev);
ndev->netdev_ops = &pch_can_netdev_ops;
priv->can.clock.freq = PCH_CAN_CLK; /* Hz */
for (index = 0; index < PCH_RX_OBJ_NUM;)
priv->msg_obj[index++] = PCH_MSG_OBJ_RX;
for (index = index; index < PCH_OBJ_NUM;)
priv->msg_obj[index++] = PCH_MSG_OBJ_TX;
netif_napi_add(ndev, &priv->napi, pch_can_rx_poll, PCH_RX_OBJ_NUM);
netif_napi_add(ndev, &priv->napi, pch_can_rx_poll, PCH_RX_OBJ_END);
rc = register_candev(ndev);
if (rc) {