Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1247 insertions, 0 deletions

diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c
new file mode 100644
index 000000000..1272ec793
--- /dev/null
+++ b/drivers/net/can/pch_can.c
@@ -0,0 +1,1247 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 1999 - 2010 Intel Corporation.
+ * Copyright (C) 2010 LAPIS SEMICONDUCTOR CO., LTD.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/can.h>
+#include <linux/can/dev.h>
+#include <linux/can/error.h>
+
+#define PCH_CTRL_INIT		BIT(0) /* The INIT bit of CANCONT register. */
+#define PCH_CTRL_IE		BIT(1) /* The IE bit of CAN control register */
+#define PCH_CTRL_IE_SIE_EIE	(BIT(3) | BIT(2) | BIT(1))
+#define PCH_CTRL_CCE		BIT(6)
+#define PCH_CTRL_OPT		BIT(7) /* The OPT bit of CANCONT register. */
+#define PCH_OPT_SILENT		BIT(3) /* The Silent bit of CANOPT reg. */
+#define PCH_OPT_LBACK		BIT(4) /* The LoopBack bit of CANOPT reg. */
+
+#define PCH_CMASK_RX_TX_SET	0x00f3
+#define PCH_CMASK_RX_TX_GET	0x0073
+#define PCH_CMASK_ALL		0xff
+#define PCH_CMASK_NEWDAT	BIT(2)
+#define PCH_CMASK_CLRINTPND	BIT(3)
+#define PCH_CMASK_CTRL		BIT(4)
+#define PCH_CMASK_ARB		BIT(5)
+#define PCH_CMASK_MASK		BIT(6)
+#define PCH_CMASK_RDWR		BIT(7)
+#define PCH_IF_MCONT_NEWDAT	BIT(15)
+#define PCH_IF_MCONT_MSGLOST	BIT(14)
+#define PCH_IF_MCONT_INTPND	BIT(13)
+#define PCH_IF_MCONT_UMASK	BIT(12)
+#define PCH_IF_MCONT_TXIE	BIT(11)
+#define PCH_IF_MCONT_RXIE	BIT(10)
+#define PCH_IF_MCONT_RMTEN	BIT(9)
+#define PCH_IF_MCONT_TXRQXT	BIT(8)
+#define PCH_IF_MCONT_EOB	BIT(7)
+#define PCH_IF_MCONT_DLC	(BIT(0) | BIT(1) | BIT(2) | BIT(3))
+#define PCH_MASK2_MDIR_MXTD	(BIT(14) | BIT(15))
+#define PCH_ID2_DIR		BIT(13)
+#define PCH_ID2_XTD		BIT(14)
+#define PCH_ID_MSGVAL		BIT(15)
+#define PCH_IF_CREQ_BUSY	BIT(15)
+
+#define PCH_STATUS_INT		0x8000
+#define PCH_RP			0x00008000
+#define PCH_REC			0x00007f00
+#define PCH_TEC			0x000000ff
+
+#define PCH_TX_OK		BIT(3)
+#define PCH_RX_OK		BIT(4)
+#define PCH_EPASSIV		BIT(5)
+#define PCH_EWARN		BIT(6)
+#define PCH_BUS_OFF		BIT(7)
+
+/* bit position of certain controller bits. */
+#define PCH_BIT_BRP_SHIFT	0
+#define PCH_BIT_SJW_SHIFT	6
+#define PCH_BIT_TSEG1_SHIFT	8
+#define PCH_BIT_TSEG2_SHIFT	12
+#define PCH_BIT_BRPE_BRPE_SHIFT	6
+
+#define PCH_MSK_BITT_BRP	0x3f
+#define PCH_MSK_BRPE_BRPE	0x3c0
+#define PCH_MSK_CTRL_IE_SIE_EIE	0x07
+#define PCH_COUNTER_LIMIT	10
+
+#define PCH_CAN_CLK		50000000	/* 50MHz */
+
+/*
+ * 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
+#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
+
+/* TxRqst2 show status of MsgObjNo.17~32 */
+#define PCH_TREQ2_TX_MASK	(((1 << PCH_TX_OBJ_NUM) - 1) <<\
+							(PCH_RX_OBJ_END - 16))
+
+enum pch_ifreg {
+	PCH_RX_IFREG,
+	PCH_TX_IFREG,
+};
+
+enum pch_can_err {
+	PCH_STUF_ERR = 1,
+	PCH_FORM_ERR,
+	PCH_ACK_ERR,
+	PCH_BIT1_ERR,
+	PCH_BIT0_ERR,
+	PCH_CRC_ERR,
+	PCH_LEC_ALL,
+};
+
+enum pch_can_mode {
+	PCH_CAN_ENABLE,
+	PCH_CAN_DISABLE,
+	PCH_CAN_ALL,
+	PCH_CAN_NONE,
+	PCH_CAN_STOP,
+	PCH_CAN_RUN,
+};
+
+struct pch_can_if_regs {
+	u32 creq;
+	u32 cmask;
+	u32 mask1;
+	u32 mask2;
+	u32 id1;
+	u32 id2;
+	u32 mcont;
+	u32 data[4];
+	u32 rsv[13];
+};
+
+struct pch_can_regs {
+	u32 cont;
+	u32 stat;
+	u32 errc;
+	u32 bitt;
+	u32 intr;
+	u32 opt;
+	u32 brpe;
+	u32 reserve;
+	struct pch_can_if_regs ifregs[2]; /* [0]=if1  [1]=if2 */
+	u32 reserve1[8];
+	u32 treq1;
+	u32 treq2;
+	u32 reserve2[6];
+	u32 data1;
+	u32 data2;
+	u32 reserve3[6];
+	u32 canipend1;
+	u32 canipend2;
+	u32 reserve4[6];
+	u32 canmval1;
+	u32 canmval2;
+	u32 reserve5[37];
+	u32 srst;
+};
+
+struct pch_can_priv {
+	struct can_priv can;
+	struct pci_dev *dev;
+	u32 tx_enable[PCH_TX_OBJ_END];
+	u32 rx_enable[PCH_TX_OBJ_END];
+	u32 rx_link[PCH_TX_OBJ_END];
+	u32 int_enables;
+	struct net_device *ndev;
+	struct pch_can_regs __iomem *regs;
+	struct napi_struct napi;
+	int tx_obj;	/* Point next Tx Obj index */
+	int use_msi;
+};
+
+static const struct can_bittiming_const pch_can_bittiming_const = {
+	.name = KBUILD_MODNAME,
+	.tseg1_min = 2,
+	.tseg1_max = 16,
+	.tseg2_min = 1,
+	.tseg2_max = 8,
+	.sjw_max = 4,
+	.brp_min = 1,
+	.brp_max = 1024, /* 6bit + extended 4bit */
+	.brp_inc = 1,
+};
+
+static const struct pci_device_id pch_pci_tbl[] = {
+	{PCI_VENDOR_ID_INTEL, 0x8818, PCI_ANY_ID, PCI_ANY_ID,},
+	{0,}
+};
+MODULE_DEVICE_TABLE(pci, pch_pci_tbl);
+
+static inline void pch_can_bit_set(void __iomem *addr, u32 mask)
+{
+	iowrite32(ioread32(addr) | mask, addr);
+}
+
+static inline void pch_can_bit_clear(void __iomem *addr, u32 mask)
+{
+	iowrite32(ioread32(addr) & ~mask, addr);
+}
+
+static void pch_can_set_run_mode(struct pch_can_priv *priv,
+				 enum pch_can_mode mode)
+{
+	switch (mode) {
+	case PCH_CAN_RUN:
+		pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_INIT);
+		break;
+
+	case PCH_CAN_STOP:
+		pch_can_bit_set(&priv->regs->cont, PCH_CTRL_INIT);
+		break;
+
+	default:
+		netdev_err(priv->ndev, "%s -> Invalid Mode.\n", __func__);
+		break;
+	}
+}
+
+static void pch_can_set_optmode(struct pch_can_priv *priv)
+{
+	u32 reg_val = ioread32(&priv->regs->opt);
+
+	if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
+		reg_val |= PCH_OPT_SILENT;
+
+	if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
+		reg_val |= PCH_OPT_LBACK;
+
+	pch_can_bit_set(&priv->regs->cont, PCH_CTRL_OPT);
+	iowrite32(reg_val, &priv->regs->opt);
+}
+
+static void pch_can_rw_msg_obj(void __iomem *creq_addr, u32 num)
+{
+	int counter = PCH_COUNTER_LIMIT;
+	u32 ifx_creq;
+
+	iowrite32(num, creq_addr);
+	while (counter) {
+		ifx_creq = ioread32(creq_addr) & PCH_IF_CREQ_BUSY;
+		if (!ifx_creq)
+			break;
+		counter--;
+		udelay(1);
+	}
+	if (!counter)
+		pr_err("%s:IF1 BUSY Flag is set forever.\n", __func__);
+}
+
+static void pch_can_set_int_enables(struct pch_can_priv *priv,
+				    enum pch_can_mode interrupt_no)
+{
+	switch (interrupt_no) {
+	case PCH_CAN_DISABLE:
+		pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_IE);
+		break;
+
+	case PCH_CAN_ALL:
+		pch_can_bit_set(&priv->regs->cont, PCH_CTRL_IE_SIE_EIE);
+		break;
+
+	case PCH_CAN_NONE:
+		pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_IE_SIE_EIE);
+		break;
+
+	default:
+		netdev_err(priv->ndev, "Invalid interrupt number.\n");
+		break;
+	}
+}
+
+static void pch_can_set_rxtx(struct pch_can_priv *priv, u32 buff_num,
+			     int set, enum pch_ifreg dir)
+{
+	u32 ie;
+
+	if (dir)
+		ie = PCH_IF_MCONT_TXIE;
+	else
+		ie = PCH_IF_MCONT_RXIE;
+
+	/* Reading the Msg buffer from Message RAM to IF1/2 registers. */
+	iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[dir].cmask);
+	pch_can_rw_msg_obj(&priv->regs->ifregs[dir].creq, buff_num);
+
+	/* Setting the IF1/2MASK1 register to access MsgVal and RxIE bits */
+	iowrite32(PCH_CMASK_RDWR | PCH_CMASK_ARB | PCH_CMASK_CTRL,
+		  &priv->regs->ifregs[dir].cmask);
+
+	if (set) {
+		/* Setting the MsgVal and RxIE/TxIE bits */
+		pch_can_bit_set(&priv->regs->ifregs[dir].mcont, ie);
+		pch_can_bit_set(&priv->regs->ifregs[dir].id2, PCH_ID_MSGVAL);
+	} else {
+		/* Clearing the MsgVal and RxIE/TxIE bits */
+		pch_can_bit_clear(&priv->regs->ifregs[dir].mcont, ie);
+		pch_can_bit_clear(&priv->regs->ifregs[dir].id2, PCH_ID_MSGVAL);
+	}
+
+	pch_can_rw_msg_obj(&priv->regs->ifregs[dir].creq, buff_num);
+}
+
+static void pch_can_set_rx_all(struct pch_can_priv *priv, int set)
+{
+	int i;
+
+	/* Traversing to obtain the object configured as receivers. */
+	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, int set)
+{
+	int i;
+
+	/* Traversing to obtain the object configured as transmit object. */
+	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_int_pending(struct pch_can_priv *priv)
+{
+	return ioread32(&priv->regs->intr) & 0xffff;
+}
+
+static void pch_can_clear_if_buffers(struct pch_can_priv *priv)
+{
+	int i; /* Msg Obj ID (1~32) */
+
+	for (i = PCH_RX_OBJ_START; i <= PCH_TX_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);
+		iowrite32(0x0, &priv->regs->ifregs[0].id1);
+		iowrite32(0x0, &priv->regs->ifregs[0].id2);
+		iowrite32(0x0, &priv->regs->ifregs[0].mcont);
+		iowrite32(0x0, &priv->regs->ifregs[0].data[0]);
+		iowrite32(0x0, &priv->regs->ifregs[0].data[1]);
+		iowrite32(0x0, &priv->regs->ifregs[0].data[2]);
+		iowrite32(0x0, &priv->regs->ifregs[0].data[3]);
+		iowrite32(PCH_CMASK_RDWR | PCH_CMASK_MASK |
+			  PCH_CMASK_ARB | PCH_CMASK_CTRL,
+			  &priv->regs->ifregs[0].cmask);
+		pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, i);
+	}
+}
+
+static void pch_can_config_rx_tx_buffers(struct pch_can_priv *priv)
+{
+	int i;
+
+	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_rw_msg_obj(&priv->regs->ifregs[0].creq, i);
+
+		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);
+
+		/* 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_EOB);
+		else
+			pch_can_bit_clear(&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);
+
+		/* Setting CMASK for writing */
+		iowrite32(PCH_CMASK_RDWR | PCH_CMASK_MASK | PCH_CMASK_ARB |
+			  PCH_CMASK_CTRL, &priv->regs->ifregs[0].cmask);
+
+		pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, i);
+	}
+
+	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_rw_msg_obj(&priv->regs->ifregs[1].creq, i);
+
+		/* Resetting DIR bit for reception */
+		iowrite32(0x0, &priv->regs->ifregs[1].id1);
+		iowrite32(PCH_ID2_DIR, &priv->regs->ifregs[1].id2);
+
+		/* Setting EOB bit for transmitter */
+		iowrite32(PCH_IF_MCONT_EOB | PCH_IF_MCONT_UMASK,
+			  &priv->regs->ifregs[1].mcont);
+
+		iowrite32(0, &priv->regs->ifregs[1].mask1);
+		pch_can_bit_clear(&priv->regs->ifregs[1].mask2, 0x1fff);
+
+		/* Setting CMASK for writing */
+		iowrite32(PCH_CMASK_RDWR | PCH_CMASK_MASK | PCH_CMASK_ARB |
+			  PCH_CMASK_CTRL, &priv->regs->ifregs[1].cmask);
+
+		pch_can_rw_msg_obj(&priv->regs->ifregs[1].creq, i);
+	}
+}
+
+static void pch_can_init(struct pch_can_priv *priv)
+{
+	/* Stopping the Can device. */
+	pch_can_set_run_mode(priv, PCH_CAN_STOP);
+
+	/* Clearing all the message object buffers. */
+	pch_can_clear_if_buffers(priv);
+
+	/* Configuring the respective message object as either rx/tx object. */
+	pch_can_config_rx_tx_buffers(priv);
+
+	/* Enabling the interrupts. */
+	pch_can_set_int_enables(priv, PCH_CAN_ALL);
+}
+
+static void pch_can_release(struct pch_can_priv *priv)
+{
+	/* Stooping the CAN device. */
+	pch_can_set_run_mode(priv, PCH_CAN_STOP);
+
+	/* Disabling the interrupts. */
+	pch_can_set_int_enables(priv, PCH_CAN_NONE);
+
+	/* Disabling all the receive object. */
+	pch_can_set_rx_all(priv, 0);
+
+	/* Disabling all the transmit object. */
+	pch_can_set_tx_all(priv, 0);
+}
+
+/* This function clears interrupt(s) from the CAN device. */
+static void pch_can_int_clr(struct pch_can_priv *priv, u32 mask)
+{
+	/* Clear interrupt for transmit object */
+	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_rw_msg_obj(&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,
+			  &priv->regs->ifregs[1].cmask);
+
+		/* Resetting the ID registers. */
+		pch_can_bit_set(&priv->regs->ifregs[1].id2,
+			       PCH_ID2_DIR | (0x7ff << 2));
+		iowrite32(0x0, &priv->regs->ifregs[1].id1);
+
+		/* Clearing NewDat, TxRqst & IntPnd */
+		pch_can_bit_clear(&priv->regs->ifregs[1].mcont,
+				  PCH_IF_MCONT_NEWDAT | PCH_IF_MCONT_INTPND |
+				  PCH_IF_MCONT_TXRQXT);
+		pch_can_rw_msg_obj(&priv->regs->ifregs[1].creq, mask);
+	}
+}
+
+static void pch_can_reset(struct pch_can_priv *priv)
+{
+	/* write to sw reset register */
+	iowrite32(1, &priv->regs->srst);
+	iowrite32(0, &priv->regs->srst);
+}
+
+static void pch_can_error(struct net_device *ndev, u32 status)
+{
+	struct sk_buff *skb;
+	struct pch_can_priv *priv = netdev_priv(ndev);
+	struct can_frame *cf;
+	u32 errc, lec;
+	struct net_device_stats *stats = &(priv->ndev->stats);
+	enum can_state state = priv->can.state;
+
+	skb = alloc_can_err_skb(ndev, &cf);
+	if (!skb)
+		return;
+
+	errc = ioread32(&priv->regs->errc);
+	if (status & PCH_BUS_OFF) {
+		pch_can_set_tx_all(priv, 0);
+		pch_can_set_rx_all(priv, 0);
+		state = CAN_STATE_BUS_OFF;
+		cf->can_id |= CAN_ERR_BUSOFF;
+		priv->can.can_stats.bus_off++;
+		can_bus_off(ndev);
+	} else {
+		cf->data[6] = errc & PCH_TEC;
+		cf->data[7] = (errc & PCH_REC) >> 8;
+	}
+
+	/* Warning interrupt. */
+	if (status & PCH_EWARN) {
+		state = CAN_STATE_ERROR_WARNING;
+		priv->can.can_stats.error_warning++;
+		cf->can_id |= CAN_ERR_CRTL;
+		if (((errc & PCH_REC) >> 8) > 96)
+			cf->data[1] |= CAN_ERR_CRTL_RX_WARNING;
+		if ((errc & PCH_TEC) > 96)
+			cf->data[1] |= CAN_ERR_CRTL_TX_WARNING;
+		netdev_dbg(ndev,
+			"%s -> Error Counter is more than 96.\n", __func__);
+	}
+	/* Error passive interrupt. */
+	if (status & PCH_EPASSIV) {
+		priv->can.can_stats.error_passive++;
+		state = CAN_STATE_ERROR_PASSIVE;
+		cf->can_id |= CAN_ERR_CRTL;
+		if (errc & PCH_RP)
+			cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE;
+		if ((errc & PCH_TEC) > 127)
+			cf->data[1] |= CAN_ERR_CRTL_TX_PASSIVE;
+		netdev_dbg(ndev,
+			"%s -> CAN controller is ERROR PASSIVE .\n", __func__);
+	}
+
+	lec = status & PCH_LEC_ALL;
+	switch (lec) {
+	case PCH_STUF_ERR:
+		cf->data[2] |= CAN_ERR_PROT_STUFF;
+		priv->can.can_stats.bus_error++;
+		stats->rx_errors++;
+		break;
+	case PCH_FORM_ERR:
+		cf->data[2] |= CAN_ERR_PROT_FORM;
+		priv->can.can_stats.bus_error++;
+		stats->rx_errors++;
+		break;
+	case PCH_ACK_ERR:
+		cf->can_id |= CAN_ERR_ACK;
+		priv->can.can_stats.bus_error++;
+		stats->rx_errors++;
+		break;
+	case PCH_BIT1_ERR:
+	case PCH_BIT0_ERR:
+		cf->data[2] |= CAN_ERR_PROT_BIT;
+		priv->can.can_stats.bus_error++;
+		stats->rx_errors++;
+		break;
+	case PCH_CRC_ERR:
+		cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
+		priv->can.can_stats.bus_error++;
+		stats->rx_errors++;
+		break;
+	case PCH_LEC_ALL: /* Written by CPU. No error status */
+		break;
+	}
+
+	priv->can.state = state;
+	netif_receive_skb(skb);
+
+	stats->rx_packets++;
+	stats->rx_bytes += cf->can_dlc;
+}
+
+static irqreturn_t pch_can_interrupt(int irq, void *dev_id)
+{
+	struct net_device *ndev = (struct net_device *)dev_id;
+	struct pch_can_priv *priv = netdev_priv(ndev);
+
+	if (!pch_can_int_pending(priv))
+		return IRQ_NONE;
+
+	pch_can_set_int_enables(priv, PCH_CAN_NONE);
+	napi_schedule(&priv->napi);
+	return IRQ_HANDLED;
+}
+
+static void pch_fifo_thresh(struct pch_can_priv *priv, int obj_id)
+{
+	if (obj_id < PCH_FIFO_THRESH) {
+		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_INTPND);
+		pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, obj_id);
+	} else if (obj_id > PCH_FIFO_THRESH) {
+		pch_can_int_clr(priv, obj_id);
+	} else if (obj_id == PCH_FIFO_THRESH) {
+		int cnt;
+		for (cnt = 0; cnt < PCH_FIFO_THRESH; cnt++)
+			pch_can_int_clr(priv, cnt + 1);
+	}
+}
+
+static void pch_can_rx_msg_lost(struct net_device *ndev, int obj_id)
+{
+	struct pch_can_priv *priv = netdev_priv(ndev);
+	struct net_device_stats *stats = &(priv->ndev->stats);
+	struct sk_buff *skb;
+	struct can_frame *cf;
+
+	netdev_dbg(priv->ndev, "Msg Obj is overwritten.\n");
+	pch_can_bit_clear(&priv->regs->ifregs[0].mcont,
+			  PCH_IF_MCONT_MSGLOST);
+	iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL,
+		  &priv->regs->ifregs[0].cmask);
+	pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, obj_id);
+
+	skb = alloc_can_err_skb(ndev, &cf);
+	if (!skb)
+		return;
+
+	cf->can_id |= CAN_ERR_CRTL;
+	cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
+	stats->rx_over_errors++;
+	stats->rx_errors++;
+
+	netif_receive_skb(skb);
+}
+
+static int pch_can_rx_normal(struct net_device *ndev, u32 obj_num, int quota)
+{
+	u32 reg;
+	canid_t id;
+	int rcv_pkts = 0;
+	struct sk_buff *skb;
+	struct can_frame *cf;
+	struct pch_can_priv *priv = netdev_priv(ndev);
+	struct net_device_stats *stats = &(priv->ndev->stats);
+	int i;
+	u32 id2;
+	u16 data_reg;
+
+	do {
+		/* Reading the message object from the Message RAM */
+		iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[0].cmask);
+		pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, obj_num);
+
+		/* Reading the MCONT register. */
+		reg = ioread32(&priv->regs->ifregs[0].mcont);
+
+		if (reg & PCH_IF_MCONT_EOB)
+			break;
+
+		/* If MsgLost bit set. */
+		if (reg & PCH_IF_MCONT_MSGLOST) {
+			pch_can_rx_msg_lost(ndev, obj_num);
+			rcv_pkts++;
+			quota--;
+			obj_num++;
+			continue;
+		} else if (!(reg & PCH_IF_MCONT_NEWDAT)) {
+			obj_num++;
+			continue;
+		}
+
+		skb = alloc_can_skb(priv->ndev, &cf);
+		if (!skb) {
+			netdev_err(ndev, "alloc_can_skb Failed\n");
+			return rcv_pkts;
+		}
+
+		/* Get Received data */
+		id2 = ioread32(&priv->regs->ifregs[0].id2);
+		if (id2 & PCH_ID2_XTD) {
+			id = (ioread32(&priv->regs->ifregs[0].id1) & 0xffff);
+			id |= (((id2) & 0x1fff) << 16);
+			cf->can_id = id | CAN_EFF_FLAG;
+		} else {
+			id = (id2 >> 2) & CAN_SFF_MASK;
+			cf->can_id = id;
+		}
+
+		if (id2 & PCH_ID2_DIR)
+			cf->can_id |= CAN_RTR_FLAG;
+
+		cf->can_dlc = get_can_dlc((ioread32(&priv->regs->
+						    ifregs[0].mcont)) & 0xF);
+
+		for (i = 0; i < cf->can_dlc; i += 2) {
+			data_reg = ioread16(&priv->regs->ifregs[0].data[i / 2]);
+			cf->data[i] = data_reg;
+			cf->data[i + 1] = data_reg >> 8;
+		}
+
+		rcv_pkts++;
+		stats->rx_packets++;
+		quota--;
+		stats->rx_bytes += cf->can_dlc;
+		netif_receive_skb(skb);
+
+		pch_fifo_thresh(priv, obj_num);
+		obj_num++;
+	} while (quota > 0);
+
+	return rcv_pkts;
+}
+
+static void pch_can_tx_complete(struct net_device *ndev, u32 int_stat)
+{
+	struct pch_can_priv *priv = netdev_priv(ndev);
+	struct net_device_stats *stats = &(priv->ndev->stats);
+	u32 dlc;
+
+	can_get_echo_skb(ndev, int_stat - PCH_RX_OBJ_END - 1);
+	iowrite32(PCH_CMASK_RX_TX_GET | PCH_CMASK_CLRINTPND,
+		  &priv->regs->ifregs[1].cmask);
+	pch_can_rw_msg_obj(&priv->regs->ifregs[1].creq, int_stat);
+	dlc = get_can_dlc(ioread32(&priv->regs->ifregs[1].mcont) &
+			  PCH_IF_MCONT_DLC);
+	stats->tx_bytes += dlc;
+	stats->tx_packets++;
+	if (int_stat == PCH_TX_OBJ_END)
+		netif_wake_queue(ndev);
+}
+
+static int pch_can_poll(struct napi_struct *napi, int quota)
+{
+	struct net_device *ndev = napi->dev;
+	struct pch_can_priv *priv = netdev_priv(ndev);
+	u32 int_stat;
+	u32 reg_stat;
+	int quota_save = quota;
+
+	int_stat = pch_can_int_pending(priv);
+	if (!int_stat)
+		goto end;
+
+	if (int_stat == PCH_STATUS_INT) {
+		reg_stat = ioread32(&priv->regs->stat);
+
+		if ((reg_stat & (PCH_BUS_OFF | PCH_LEC_ALL)) &&
+		   ((reg_stat & PCH_LEC_ALL) != PCH_LEC_ALL)) {
+			pch_can_error(ndev, reg_stat);
+			quota--;
+		}
+
+		if (reg_stat & (PCH_TX_OK | PCH_RX_OK))
+			pch_can_bit_clear(&priv->regs->stat,
+					  reg_stat & (PCH_TX_OK | PCH_RX_OK));
+
+		int_stat = pch_can_int_pending(priv);
+	}
+
+	if (quota == 0)
+		goto end;
+
+	if ((int_stat >= PCH_RX_OBJ_START) && (int_stat <= PCH_RX_OBJ_END)) {
+		quota -= pch_can_rx_normal(ndev, int_stat, quota);
+	} else if ((int_stat >= PCH_TX_OBJ_START) &&
+		   (int_stat <= PCH_TX_OBJ_END)) {
+		/* Handle transmission interrupt */
+		pch_can_tx_complete(ndev, int_stat);
+	}
+
+end:
+	napi_complete(napi);
+	pch_can_set_int_enables(priv, PCH_CAN_ALL);
+
+	return quota_save - quota;
+}
+
+static int pch_set_bittiming(struct net_device *ndev)
+{
+	struct pch_can_priv *priv = netdev_priv(ndev);
+	const struct can_bittiming *bt = &priv->can.bittiming;
+	u32 canbit;
+	u32 bepe;
+
+	/* Setting the CCE bit for accessing the Can Timing register. */
+	pch_can_bit_set(&priv->regs->cont, PCH_CTRL_CCE);
+
+	canbit = (bt->brp - 1) & PCH_MSK_BITT_BRP;
+	canbit |= (bt->sjw - 1) << PCH_BIT_SJW_SHIFT;
+	canbit |= (bt->phase_seg1 + bt->prop_seg - 1) << PCH_BIT_TSEG1_SHIFT;
+	canbit |= (bt->phase_seg2 - 1) << PCH_BIT_TSEG2_SHIFT;
+	bepe = ((bt->brp - 1) & PCH_MSK_BRPE_BRPE) >> PCH_BIT_BRPE_BRPE_SHIFT;
+	iowrite32(canbit, &priv->regs->bitt);
+	iowrite32(bepe, &priv->regs->brpe);
+	pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_CCE);
+
+	return 0;
+}
+
+static void pch_can_start(struct net_device *ndev)
+{
+	struct pch_can_priv *priv = netdev_priv(ndev);
+
+	if (priv->can.state != CAN_STATE_STOPPED)
+		pch_can_reset(priv);
+
+	pch_set_bittiming(ndev);
+	pch_can_set_optmode(priv);
+
+	pch_can_set_tx_all(priv, 1);
+	pch_can_set_rx_all(priv, 1);
+
+	/* Setting the CAN to run mode. */
+	pch_can_set_run_mode(priv, PCH_CAN_RUN);
+
+	priv->can.state = CAN_STATE_ERROR_ACTIVE;
+
+	return;
+}
+
+static int pch_can_do_set_mode(struct net_device *ndev, enum can_mode mode)
+{
+	int ret = 0;
+
+	switch (mode) {
+	case CAN_MODE_START:
+		pch_can_start(ndev);
+		netif_wake_queue(ndev);
+		break;
+	default:
+		ret = -EOPNOTSUPP;
+		break;
+	}
+
+	return ret;
+}
+
+static int pch_can_open(struct net_device *ndev)
+{
+	struct pch_can_priv *priv = netdev_priv(ndev);
+	int retval;
+
+	/* Registering the interrupt. */
+	retval = request_irq(priv->dev->irq, pch_can_interrupt, IRQF_SHARED,
+			     ndev->name, ndev);
+	if (retval) {
+		netdev_err(ndev, "request_irq failed.\n");
+		goto req_irq_err;
+	}
+
+	/* Open common can device */
+	retval = open_candev(ndev);
+	if (retval) {
+		netdev_err(ndev, "open_candev() failed %d\n", retval);
+		goto err_open_candev;
+	}
+
+	pch_can_init(priv);
+	pch_can_start(ndev);
+	napi_enable(&priv->napi);
+	netif_start_queue(ndev);
+
+	return 0;
+
+err_open_candev:
+	free_irq(priv->dev->irq, ndev);
+req_irq_err:
+	pch_can_release(priv);
+
+	return retval;
+}
+
+static int pch_close(struct net_device *ndev)
+{
+	struct pch_can_priv *priv = netdev_priv(ndev);
+
+	netif_stop_queue(ndev);
+	napi_disable(&priv->napi);
+	pch_can_release(priv);
+	free_irq(priv->dev->irq, ndev);
+	close_candev(ndev);
+	priv->can.state = CAN_STATE_STOPPED;
+	return 0;
+}
+
+static netdev_tx_t pch_xmit(struct sk_buff *skb, struct net_device *ndev)
+{
+	struct pch_can_priv *priv = netdev_priv(ndev);
+	struct can_frame *cf = (struct can_frame *)skb->data;
+	int tx_obj_no;
+	int i;
+	u32 id2;
+
+	if (can_dropped_invalid_skb(ndev, skb))
+		return NETDEV_TX_OK;
+
+	tx_obj_no = priv->tx_obj;
+	if (priv->tx_obj == PCH_TX_OBJ_END) {
+		if (ioread32(&priv->regs->treq2) & PCH_TREQ2_TX_MASK)
+			netif_stop_queue(ndev);
+
+		priv->tx_obj = PCH_TX_OBJ_START;
+	} else {
+		priv->tx_obj++;
+	}
+
+	/* Setting the CMASK register. */
+	pch_can_bit_set(&priv->regs->ifregs[1].cmask, PCH_CMASK_ALL);
+
+	/* If ID extended is set. */
+	if (cf->can_id & CAN_EFF_FLAG) {
+		iowrite32(cf->can_id & 0xffff, &priv->regs->ifregs[1].id1);
+		id2 = ((cf->can_id >> 16) & 0x1fff) | PCH_ID2_XTD;
+	} else {
+		iowrite32(0, &priv->regs->ifregs[1].id1);
+		id2 = (cf->can_id & CAN_SFF_MASK) << 2;
+	}
+
+	id2 |= PCH_ID_MSGVAL;
+
+	/* If remote frame has to be transmitted.. */
+	if (!(cf->can_id & CAN_RTR_FLAG))
+		id2 |= PCH_ID2_DIR;
+
+	iowrite32(id2, &priv->regs->ifregs[1].id2);
+
+	/* Copy data to register */
+	for (i = 0; i < cf->can_dlc; i += 2) {
+		iowrite16(cf->data[i] | (cf->data[i + 1] << 8),
+			  &priv->regs->ifregs[1].data[i / 2]);
+	}
+
+	can_put_echo_skb(skb, ndev, tx_obj_no - PCH_RX_OBJ_END - 1);
+
+	/* Set the size of the data. Update if2_mcont */
+	iowrite32(cf->can_dlc | PCH_IF_MCONT_NEWDAT | PCH_IF_MCONT_TXRQXT |
+		  PCH_IF_MCONT_TXIE, &priv->regs->ifregs[1].mcont);
+
+	pch_can_rw_msg_obj(&priv->regs->ifregs[1].creq, tx_obj_no);
+
+	return NETDEV_TX_OK;
+}
+
+static const struct net_device_ops pch_can_netdev_ops = {
+	.ndo_open		= pch_can_open,
+	.ndo_stop		= pch_close,
+	.ndo_start_xmit		= pch_xmit,
+	.ndo_change_mtu		= can_change_mtu,
+};
+
+static void pch_can_remove(struct pci_dev *pdev)
+{
+	struct net_device *ndev = pci_get_drvdata(pdev);
+	struct pch_can_priv *priv = netdev_priv(ndev);
+
+	unregister_candev(priv->ndev);
+	if (priv->use_msi)
+		pci_disable_msi(priv->dev);
+	pci_release_regions(pdev);
+	pci_disable_device(pdev);
+	pch_can_reset(priv);
+	pci_iounmap(pdev, priv->regs);
+	free_candev(priv->ndev);
+}
+
+static void __maybe_unused pch_can_set_int_custom(struct pch_can_priv *priv)
+{
+	/* Clearing the IE, SIE and EIE bits of Can control register. */
+	pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_IE_SIE_EIE);
+
+	/* Appropriately setting them. */
+	pch_can_bit_set(&priv->regs->cont,
+			((priv->int_enables & PCH_MSK_CTRL_IE_SIE_EIE) << 1));
+}
+
+/* This function retrieves interrupt enabled for the CAN device. */
+static u32 __maybe_unused pch_can_get_int_enables(struct pch_can_priv *priv)
+{
+	/* Obtaining the status of IE, SIE and EIE interrupt bits. */
+	return (ioread32(&priv->regs->cont) & PCH_CTRL_IE_SIE_EIE) >> 1;
+}
+
+static u32 __maybe_unused pch_can_get_rxtx_ir(struct pch_can_priv *priv,
+					      u32 buff_num, enum pch_ifreg dir)
+{
+	u32 ie, enable;
+
+	if (dir)
+		ie = PCH_IF_MCONT_RXIE;
+	else
+		ie = PCH_IF_MCONT_TXIE;
+
+	iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[dir].cmask);
+	pch_can_rw_msg_obj(&priv->regs->ifregs[dir].creq, buff_num);
+
+	if (((ioread32(&priv->regs->ifregs[dir].id2)) & PCH_ID_MSGVAL) &&
+			((ioread32(&priv->regs->ifregs[dir].mcont)) & ie))
+		enable = 1;
+	else
+		enable = 0;
+
+	return enable;
+}
+
+static void __maybe_unused pch_can_set_rx_buffer_link(struct pch_can_priv *priv,
+						      u32 buffer_num, int set)
+{
+	iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[0].cmask);
+	pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, buffer_num);
+	iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL,
+		  &priv->regs->ifregs[0].cmask);
+	if (set)
+		pch_can_bit_clear(&priv->regs->ifregs[0].mcont,
+				  PCH_IF_MCONT_EOB);
+	else
+		pch_can_bit_set(&priv->regs->ifregs[0].mcont, PCH_IF_MCONT_EOB);
+
+	pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, buffer_num);
+}
+
+static u32 __maybe_unused pch_can_get_rx_buffer_link(struct pch_can_priv *priv,
+						     u32 buffer_num)
+{
+	u32 link;
+
+	iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[0].cmask);
+	pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, buffer_num);
+
+	if (ioread32(&priv->regs->ifregs[0].mcont) & PCH_IF_MCONT_EOB)
+		link = 0;
+	else
+		link = 1;
+	return link;
+}
+
+static int __maybe_unused pch_can_get_buffer_status(struct pch_can_priv *priv)
+{
+	return (ioread32(&priv->regs->treq1) & 0xffff) |
+	       (ioread32(&priv->regs->treq2) << 16);
+}
+
+static int __maybe_unused pch_can_suspend(struct device *dev_d)
+{
+	int i;
+	u32 buf_stat;	/* Variable for reading the transmit buffer status. */
+	int counter = PCH_COUNTER_LIMIT;
+
+	struct net_device *dev = dev_get_drvdata(dev_d);
+	struct pch_can_priv *priv = netdev_priv(dev);
+
+	/* Stop the CAN controller */
+	pch_can_set_run_mode(priv, PCH_CAN_STOP);
+
+	/* Indicate that we are aboutto/in suspend */
+	priv->can.state = CAN_STATE_STOPPED;
+
+	/* Waiting for all transmission to complete. */
+	while (counter) {
+		buf_stat = pch_can_get_buffer_status(priv);
+		if (!buf_stat)
+			break;
+		counter--;
+		udelay(1);
+	}
+	if (!counter)
+		dev_err(dev_d, "%s -> Transmission time out.\n", __func__);
+
+	/* Save interrupt configuration and then disable them */
+	priv->int_enables = pch_can_get_int_enables(priv);
+	pch_can_set_int_enables(priv, PCH_CAN_DISABLE);
+
+	/* Save Tx buffer enable state */
+	for (i = PCH_TX_OBJ_START; i <= PCH_TX_OBJ_END; i++)
+		priv->tx_enable[i - 1] = 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 = PCH_RX_OBJ_START; i <= PCH_RX_OBJ_END; i++) {
+		priv->rx_enable[i - 1] = pch_can_get_rxtx_ir(priv, i,
+							     PCH_RX_IFREG);
+		priv->rx_link[i - 1] = pch_can_get_rx_buffer_link(priv, i);
+	}
+
+	/* Disable all Receive buffers */
+	pch_can_set_rx_all(priv, 0);
+
+	return 0;
+}
+
+static int __maybe_unused pch_can_resume(struct device *dev_d)
+{
+	int i;
+	struct net_device *dev = dev_get_drvdata(dev_d);
+	struct pch_can_priv *priv = netdev_priv(dev);
+
+	priv->can.state = CAN_STATE_ERROR_ACTIVE;
+
+	/* Disabling all interrupts. */
+	pch_can_set_int_enables(priv, PCH_CAN_DISABLE);
+
+	/* Setting the CAN device in Stop Mode. */
+	pch_can_set_run_mode(priv, PCH_CAN_STOP);
+
+	/* Configuring the transmit and receive buffers. */
+	pch_can_config_rx_tx_buffers(priv);
+
+	/* Restore the CAN state */
+	pch_set_bittiming(dev);
+
+	/* Listen/Active */
+	pch_can_set_optmode(priv);
+
+	/* Enabling the transmit buffer. */
+	for (i = PCH_TX_OBJ_START; i <= PCH_TX_OBJ_END; i++)
+		pch_can_set_rxtx(priv, i, priv->tx_enable[i - 1], PCH_TX_IFREG);
+
+	/* Configuring the receive buffer and enabling them. */
+	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 - 1]);
+
+		/* Restore buffer enables */
+		pch_can_set_rxtx(priv, i, priv->rx_enable[i - 1], PCH_RX_IFREG);
+	}
+
+	/* Enable CAN Interrupts */
+	pch_can_set_int_custom(priv);
+
+	/* Restore Run Mode */
+	pch_can_set_run_mode(priv, PCH_CAN_RUN);
+
+	return 0;
+}
+
+static int pch_can_get_berr_counter(const struct net_device *dev,
+				    struct can_berr_counter *bec)
+{
+	struct pch_can_priv *priv = netdev_priv(dev);
+	u32 errc = ioread32(&priv->regs->errc);
+
+	bec->txerr = errc & PCH_TEC;
+	bec->rxerr = (errc & PCH_REC) >> 8;
+
+	return 0;
+}
+
+static int pch_can_probe(struct pci_dev *pdev,
+				   const struct pci_device_id *id)
+{
+	struct net_device *ndev;
+	struct pch_can_priv *priv;
+	int rc;
+	void __iomem *addr;
+
+	rc = pci_enable_device(pdev);
+	if (rc) {
+		dev_err(&pdev->dev, "Failed pci_enable_device %d\n", rc);
+		goto probe_exit_endev;
+	}
+
+	rc = pci_request_regions(pdev, KBUILD_MODNAME);
+	if (rc) {
+		dev_err(&pdev->dev, "Failed pci_request_regions %d\n", rc);
+		goto probe_exit_pcireq;
+	}
+
+	addr = pci_iomap(pdev, 1, 0);
+	if (!addr) {
+		rc = -EIO;
+		dev_err(&pdev->dev, "Failed pci_iomap\n");
+		goto probe_exit_ipmap;
+	}
+
+	ndev = alloc_candev(sizeof(struct pch_can_priv), PCH_TX_OBJ_END);
+	if (!ndev) {
+		rc = -ENOMEM;
+		dev_err(&pdev->dev, "Failed alloc_candev\n");
+		goto probe_exit_alloc_candev;
+	}
+
+	priv = netdev_priv(ndev);
+	priv->ndev = ndev;
+	priv->regs = addr;
+	priv->dev = pdev;
+	priv->can.bittiming_const = &pch_can_bittiming_const;
+	priv->can.do_set_mode = pch_can_do_set_mode;
+	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_TX_OBJ_START; /* Point head of Tx Obj */
+
+	ndev->irq = pdev->irq;
+	ndev->flags |= IFF_ECHO;
+
+	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 */
+
+	netif_napi_add(ndev, &priv->napi, pch_can_poll, PCH_RX_OBJ_END);
+
+	rc = pci_enable_msi(priv->dev);
+	if (rc) {
+		netdev_err(ndev, "PCH CAN opened without MSI\n");
+		priv->use_msi = 0;
+	} else {
+		netdev_err(ndev, "PCH CAN opened with MSI\n");
+		pci_set_master(pdev);
+		priv->use_msi = 1;
+	}
+
+	rc = register_candev(ndev);
+	if (rc) {
+		dev_err(&pdev->dev, "Failed register_candev %d\n", rc);
+		goto probe_exit_reg_candev;
+	}
+
+	return 0;
+
+probe_exit_reg_candev:
+	if (priv->use_msi)
+		pci_disable_msi(priv->dev);
+	free_candev(ndev);
+probe_exit_alloc_candev:
+	pci_iounmap(pdev, addr);
+probe_exit_ipmap:
+	pci_release_regions(pdev);
+probe_exit_pcireq:
+	pci_disable_device(pdev);
+probe_exit_endev:
+	return rc;
+}
+
+static SIMPLE_DEV_PM_OPS(pch_can_pm_ops,
+			 pch_can_suspend,
+			 pch_can_resume);
+
+static struct pci_driver pch_can_pci_driver = {
+	.name = "pch_can",
+	.id_table = pch_pci_tbl,
+	.probe = pch_can_probe,
+	.remove = pch_can_remove,
+	.driver.pm = &pch_can_pm_ops,
+};
+
+module_pci_driver(pch_can_pci_driver);
+
+MODULE_DESCRIPTION("Intel EG20T PCH CAN(Controller Area Network) Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_VERSION("0.94");