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From:   Aaron Wu <aaron.wu@analog.com>
To:     <linux-kernel@vger.kernel.org>
CC:     <aaron.wu@analog.com>
Subject: [Blackfin removal] [PATCH 22/28] can: Remove Blackfin CAN bus support
Date:   Fri, 16 Mar 2018 15:08:20 +0800
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Signed-off-by: Aaron Wu <aaron.wu@analog.com>

Remove Blackfin CAN bus support
---
 drivers/net/can/Kconfig    |   9 -
 drivers/net/can/Makefile   |   1 -
 drivers/net/can/bfin_can.c | 784 ---------------------------------------------
 3 files changed, 794 deletions(-)
 delete mode 100644 drivers/net/can/bfin_can.c

diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig
index ac4ff39..2cb7598 100644
--- a/drivers/net/can/Kconfig
+++ b/drivers/net/can/Kconfig
@@ -88,15 +88,6 @@ config CAN_AT91
 	  This is a driver for the SoC CAN controller in Atmel's AT91SAM9263
 	  and AT91SAM9X5 processors.
 
-config CAN_BFIN
-	depends on BF534 || BF536 || BF537 || BF538 || BF539 || BF54x
-	tristate "Analog Devices Blackfin on-chip CAN"
-	---help---
-	  Driver for the Analog Devices Blackfin on-chip CAN controllers
-
-	  To compile this driver as a module, choose M here: the
-	  module will be called bfin_can.
-
 config CAN_FLEXCAN
 	tristate "Support for Freescale FLEXCAN based chips"
 	depends on ARM || PPC
diff --git a/drivers/net/can/Makefile b/drivers/net/can/Makefile
index 02b8ed7..44922bf 100644
--- a/drivers/net/can/Makefile
+++ b/drivers/net/can/Makefile
@@ -19,7 +19,6 @@ obj-y				+= usb/
 obj-y				+= softing/
 
 obj-$(CONFIG_CAN_AT91)		+= at91_can.o
-obj-$(CONFIG_CAN_BFIN)		+= bfin_can.o
 obj-$(CONFIG_CAN_CC770)		+= cc770/
 obj-$(CONFIG_CAN_C_CAN)		+= c_can/
 obj-$(CONFIG_CAN_FLEXCAN)	+= flexcan.o
diff --git a/drivers/net/can/bfin_can.c b/drivers/net/can/bfin_can.c
deleted file mode 100644
index 1deb8ff9..0000000
--- a/drivers/net/can/bfin_can.c
+++ /dev/null
@@ -1,784 +0,0 @@
-/*
- * Blackfin On-Chip CAN Driver
- *
- * Copyright 2004-2009 Analog Devices Inc.
- *
- * Enter bugs at http://blackfin.uclinux.org/
- *
- * Licensed under the GPL-2 or later.
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/bitops.h>
-#include <linux/interrupt.h>
-#include <linux/errno.h>
-#include <linux/netdevice.h>
-#include <linux/skbuff.h>
-#include <linux/platform_device.h>
-
-#include <linux/can/dev.h>
-#include <linux/can/error.h>
-
-#include <asm/portmux.h>
-
-#define DRV_NAME "bfin_can"
-#define BFIN_CAN_TIMEOUT 100
-#define TX_ECHO_SKB_MAX  1
-
-/* transmit and receive channels */
-#define TRANSMIT_CHL 24
-#define RECEIVE_STD_CHL 0
-#define RECEIVE_EXT_CHL 4
-#define RECEIVE_RTR_CHL 8
-#define RECEIVE_EXT_RTR_CHL 12
-#define MAX_CHL_NUMBER 32
-
-/* All Blackfin system MMRs are padded to 32bits even if the register
- * itself is only 16bits.  So use a helper macro to streamline this
- */
-#define __BFP(m) u16 m; u16 __pad_##m
-
-/* bfin can registers layout */
-struct bfin_can_mask_regs {
-	__BFP(aml);
-	__BFP(amh);
-};
-
-struct bfin_can_channel_regs {
-	/* data[0,2,4,6] -> data{0,1,2,3} while data[1,3,5,7] is padding */
-	u16 data[8];
-	__BFP(dlc);
-	__BFP(tsv);
-	__BFP(id0);
-	__BFP(id1);
-};
-
-struct bfin_can_regs {
-	/* global control and status registers */
-	__BFP(mc1);		/* offset 0x00 */
-	__BFP(md1);		/* offset 0x04 */
-	__BFP(trs1);		/* offset 0x08 */
-	__BFP(trr1);		/* offset 0x0c */
-	__BFP(ta1);		/* offset 0x10 */
-	__BFP(aa1);		/* offset 0x14 */
-	__BFP(rmp1);		/* offset 0x18 */
-	__BFP(rml1);		/* offset 0x1c */
-	__BFP(mbtif1);		/* offset 0x20 */
-	__BFP(mbrif1);		/* offset 0x24 */
-	__BFP(mbim1);		/* offset 0x28 */
-	__BFP(rfh1);		/* offset 0x2c */
-	__BFP(opss1);		/* offset 0x30 */
-	u32 __pad1[3];
-	__BFP(mc2);		/* offset 0x40 */
-	__BFP(md2);		/* offset 0x44 */
-	__BFP(trs2);		/* offset 0x48 */
-	__BFP(trr2);		/* offset 0x4c */
-	__BFP(ta2);		/* offset 0x50 */
-	__BFP(aa2);		/* offset 0x54 */
-	__BFP(rmp2);		/* offset 0x58 */
-	__BFP(rml2);		/* offset 0x5c */
-	__BFP(mbtif2);		/* offset 0x60 */
-	__BFP(mbrif2);		/* offset 0x64 */
-	__BFP(mbim2);		/* offset 0x68 */
-	__BFP(rfh2);		/* offset 0x6c */
-	__BFP(opss2);		/* offset 0x70 */
-	u32 __pad2[3];
-	__BFP(clock);		/* offset 0x80 */
-	__BFP(timing);		/* offset 0x84 */
-	__BFP(debug);		/* offset 0x88 */
-	__BFP(status);		/* offset 0x8c */
-	__BFP(cec);		/* offset 0x90 */
-	__BFP(gis);		/* offset 0x94 */
-	__BFP(gim);		/* offset 0x98 */
-	__BFP(gif);		/* offset 0x9c */
-	__BFP(control);		/* offset 0xa0 */
-	__BFP(intr);		/* offset 0xa4 */
-	__BFP(version);		/* offset 0xa8 */
-	__BFP(mbtd);		/* offset 0xac */
-	__BFP(ewr);		/* offset 0xb0 */
-	__BFP(esr);		/* offset 0xb4 */
-	u32 __pad3[2];
-	__BFP(ucreg);		/* offset 0xc0 */
-	__BFP(uccnt);		/* offset 0xc4 */
-	__BFP(ucrc);		/* offset 0xc8 */
-	__BFP(uccnf);		/* offset 0xcc */
-	u32 __pad4[1];
-	__BFP(version2);	/* offset 0xd4 */
-	u32 __pad5[10];
-
-	/* channel(mailbox) mask and message registers */
-	struct bfin_can_mask_regs msk[MAX_CHL_NUMBER];		/* offset 0x100 */
-	struct bfin_can_channel_regs chl[MAX_CHL_NUMBER];	/* offset 0x200 */
-};
-
-#undef __BFP
-
-#define SRS 0x0001		/* Software Reset */
-#define SER 0x0008		/* Stuff Error */
-#define BOIM 0x0008		/* Enable Bus Off Interrupt */
-#define CCR 0x0080		/* CAN Configuration Mode Request */
-#define CCA 0x0080		/* Configuration Mode Acknowledge */
-#define SAM 0x0080		/* Sampling */
-#define AME 0x8000		/* Acceptance Mask Enable */
-#define RMLIM 0x0080		/* Enable RX Message Lost Interrupt */
-#define RMLIS 0x0080		/* RX Message Lost IRQ Status */
-#define RTR 0x4000		/* Remote Frame Transmission Request */
-#define BOIS 0x0008		/* Bus Off IRQ Status */
-#define IDE 0x2000		/* Identifier Extension */
-#define EPIS 0x0004		/* Error-Passive Mode IRQ Status */
-#define EPIM 0x0004		/* Enable Error-Passive Mode Interrupt */
-#define EWTIS 0x0001		/* TX Error Count IRQ Status */
-#define EWRIS 0x0002		/* RX Error Count IRQ Status */
-#define BEF 0x0040		/* Bit Error Flag */
-#define FER 0x0080		/* Form Error Flag */
-#define SMR 0x0020		/* Sleep Mode Request */
-#define SMACK 0x0008		/* Sleep Mode Acknowledge */
-
-/*
- * bfin can private data
- */
-struct bfin_can_priv {
-	struct can_priv can;	/* must be the first member */
-	struct net_device *dev;
-	void __iomem *membase;
-	int rx_irq;
-	int tx_irq;
-	int err_irq;
-	unsigned short *pin_list;
-};
-
-/*
- * bfin can timing parameters
- */
-static const struct can_bittiming_const bfin_can_bittiming_const = {
-	.name = DRV_NAME,
-	.tseg1_min = 1,
-	.tseg1_max = 16,
-	.tseg2_min = 1,
-	.tseg2_max = 8,
-	.sjw_max = 4,
-	/*
-	 * Although the BRP field can be set to any value, it is recommended
-	 * that the value be greater than or equal to 4, as restrictions
-	 * apply to the bit timing configuration when BRP is less than 4.
-	 */
-	.brp_min = 4,
-	.brp_max = 1024,
-	.brp_inc = 1,
-};
-
-static int bfin_can_set_bittiming(struct net_device *dev)
-{
-	struct bfin_can_priv *priv = netdev_priv(dev);
-	struct bfin_can_regs __iomem *reg = priv->membase;
-	struct can_bittiming *bt = &priv->can.bittiming;
-	u16 clk, timing;
-
-	clk = bt->brp - 1;
-	timing = ((bt->sjw - 1) << 8) | (bt->prop_seg + bt->phase_seg1 - 1) |
-		((bt->phase_seg2 - 1) << 4);
-
-	/*
-	 * If the SAM bit is set, the input signal is oversampled three times
-	 * at the SCLK rate.
-	 */
-	if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
-		timing |= SAM;
-
-	writew(clk, &reg->clock);
-	writew(timing, &reg->timing);
-
-	netdev_info(dev, "setting CLOCK=0x%04x TIMING=0x%04x\n", clk, timing);
-
-	return 0;
-}
-
-static void bfin_can_set_reset_mode(struct net_device *dev)
-{
-	struct bfin_can_priv *priv = netdev_priv(dev);
-	struct bfin_can_regs __iomem *reg = priv->membase;
-	int timeout = BFIN_CAN_TIMEOUT;
-	int i;
-
-	/* disable interrupts */
-	writew(0, &reg->mbim1);
-	writew(0, &reg->mbim2);
-	writew(0, &reg->gim);
-
-	/* reset can and enter configuration mode */
-	writew(SRS | CCR, &reg->control);
-	writew(CCR, &reg->control);
-	while (!(readw(&reg->control) & CCA)) {
-		udelay(10);
-		if (--timeout == 0) {
-			netdev_err(dev, "fail to enter configuration mode\n");
-			BUG();
-		}
-	}
-
-	/*
-	 * All mailbox configurations are marked as inactive
-	 * by writing to CAN Mailbox Configuration Registers 1 and 2
-	 * For all bits: 0 - Mailbox disabled, 1 - Mailbox enabled
-	 */
-	writew(0, &reg->mc1);
-	writew(0, &reg->mc2);
-
-	/* Set Mailbox Direction */
-	writew(0xFFFF, &reg->md1);   /* mailbox 1-16 are RX */
-	writew(0, &reg->md2);   /* mailbox 17-32 are TX */
-
-	/* RECEIVE_STD_CHL */
-	for (i = 0; i < 2; i++) {
-		writew(0, &reg->chl[RECEIVE_STD_CHL + i].id0);
-		writew(AME, &reg->chl[RECEIVE_STD_CHL + i].id1);
-		writew(0, &reg->chl[RECEIVE_STD_CHL + i].dlc);
-		writew(0x1FFF, &reg->msk[RECEIVE_STD_CHL + i].amh);
-		writew(0xFFFF, &reg->msk[RECEIVE_STD_CHL + i].aml);
-	}
-
-	/* RECEIVE_EXT_CHL */
-	for (i = 0; i < 2; i++) {
-		writew(0, &reg->chl[RECEIVE_EXT_CHL + i].id0);
-		writew(AME | IDE, &reg->chl[RECEIVE_EXT_CHL + i].id1);
-		writew(0, &reg->chl[RECEIVE_EXT_CHL + i].dlc);
-		writew(0x1FFF, &reg->msk[RECEIVE_EXT_CHL + i].amh);
-		writew(0xFFFF, &reg->msk[RECEIVE_EXT_CHL + i].aml);
-	}
-
-	writew(BIT(TRANSMIT_CHL - 16), &reg->mc2);
-	writew(BIT(RECEIVE_STD_CHL) + BIT(RECEIVE_EXT_CHL), &reg->mc1);
-
-	priv->can.state = CAN_STATE_STOPPED;
-}
-
-static void bfin_can_set_normal_mode(struct net_device *dev)
-{
-	struct bfin_can_priv *priv = netdev_priv(dev);
-	struct bfin_can_regs __iomem *reg = priv->membase;
-	int timeout = BFIN_CAN_TIMEOUT;
-
-	/*
-	 * leave configuration mode
-	 */
-	writew(readw(&reg->control) & ~CCR, &reg->control);
-
-	while (readw(&reg->status) & CCA) {
-		udelay(10);
-		if (--timeout == 0) {
-			netdev_err(dev, "fail to leave configuration mode\n");
-			BUG();
-		}
-	}
-
-	/*
-	 * clear _All_  tx and rx interrupts
-	 */
-	writew(0xFFFF, &reg->mbtif1);
-	writew(0xFFFF, &reg->mbtif2);
-	writew(0xFFFF, &reg->mbrif1);
-	writew(0xFFFF, &reg->mbrif2);
-
-	/*
-	 * clear global interrupt status register
-	 */
-	writew(0x7FF, &reg->gis); /* overwrites with '1' */
-
-	/*
-	 * Initialize Interrupts
-	 * - set bits in the mailbox interrupt mask register
-	 * - global interrupt mask
-	 */
-	writew(BIT(RECEIVE_STD_CHL) + BIT(RECEIVE_EXT_CHL), &reg->mbim1);
-	writew(BIT(TRANSMIT_CHL - 16), &reg->mbim2);
-
-	writew(EPIM | BOIM | RMLIM, &reg->gim);
-}
-
-static void bfin_can_start(struct net_device *dev)
-{
-	struct bfin_can_priv *priv = netdev_priv(dev);
-
-	/* enter reset mode */
-	if (priv->can.state != CAN_STATE_STOPPED)
-		bfin_can_set_reset_mode(dev);
-
-	/* leave reset mode */
-	bfin_can_set_normal_mode(dev);
-}
-
-static int bfin_can_set_mode(struct net_device *dev, enum can_mode mode)
-{
-	switch (mode) {
-	case CAN_MODE_START:
-		bfin_can_start(dev);
-		if (netif_queue_stopped(dev))
-			netif_wake_queue(dev);
-		break;
-
-	default:
-		return -EOPNOTSUPP;
-	}
-
-	return 0;
-}
-
-static int bfin_can_get_berr_counter(const struct net_device *dev,
-				     struct can_berr_counter *bec)
-{
-	struct bfin_can_priv *priv = netdev_priv(dev);
-	struct bfin_can_regs __iomem *reg = priv->membase;
-
-	u16 cec = readw(&reg->cec);
-
-	bec->txerr = cec >> 8;
-	bec->rxerr = cec;
-
-	return 0;
-}
-
-static int bfin_can_start_xmit(struct sk_buff *skb, struct net_device *dev)
-{
-	struct bfin_can_priv *priv = netdev_priv(dev);
-	struct bfin_can_regs __iomem *reg = priv->membase;
-	struct can_frame *cf = (struct can_frame *)skb->data;
-	u8 dlc = cf->can_dlc;
-	canid_t id = cf->can_id;
-	u8 *data = cf->data;
-	u16 val;
-	int i;
-
-	if (can_dropped_invalid_skb(dev, skb))
-		return NETDEV_TX_OK;
-
-	netif_stop_queue(dev);
-
-	/* fill id */
-	if (id & CAN_EFF_FLAG) {
-		writew(id, &reg->chl[TRANSMIT_CHL].id0);
-		val = ((id & 0x1FFF0000) >> 16) | IDE;
-	} else
-		val = (id << 2);
-	if (id & CAN_RTR_FLAG)
-		val |= RTR;
-	writew(val | AME, &reg->chl[TRANSMIT_CHL].id1);
-
-	/* fill payload */
-	for (i = 0; i < 8; i += 2) {
-		val = ((7 - i) < dlc ? (data[7 - i]) : 0) +
-			((6 - i) < dlc ? (data[6 - i] << 8) : 0);
-		writew(val, &reg->chl[TRANSMIT_CHL].data[i]);
-	}
-
-	/* fill data length code */
-	writew(dlc, &reg->chl[TRANSMIT_CHL].dlc);
-
-	can_put_echo_skb(skb, dev, 0);
-
-	/* set transmit request */
-	writew(BIT(TRANSMIT_CHL - 16), &reg->trs2);
-
-	return 0;
-}
-
-static void bfin_can_rx(struct net_device *dev, u16 isrc)
-{
-	struct bfin_can_priv *priv = netdev_priv(dev);
-	struct net_device_stats *stats = &dev->stats;
-	struct bfin_can_regs __iomem *reg = priv->membase;
-	struct can_frame *cf;
-	struct sk_buff *skb;
-	int obj;
-	int i;
-	u16 val;
-
-	skb = alloc_can_skb(dev, &cf);
-	if (skb == NULL)
-		return;
-
-	/* get id */
-	if (isrc & BIT(RECEIVE_EXT_CHL)) {
-		/* extended frame format (EFF) */
-		cf->can_id = ((readw(&reg->chl[RECEIVE_EXT_CHL].id1)
-			     & 0x1FFF) << 16)
-			     + readw(&reg->chl[RECEIVE_EXT_CHL].id0);
-		cf->can_id |= CAN_EFF_FLAG;
-		obj = RECEIVE_EXT_CHL;
-	} else {
-		/* standard frame format (SFF) */
-		cf->can_id = (readw(&reg->chl[RECEIVE_STD_CHL].id1)
-			     & 0x1ffc) >> 2;
-		obj = RECEIVE_STD_CHL;
-	}
-	if (readw(&reg->chl[obj].id1) & RTR)
-		cf->can_id |= CAN_RTR_FLAG;
-
-	/* get data length code */
-	cf->can_dlc = get_can_dlc(readw(&reg->chl[obj].dlc) & 0xF);
-
-	/* get payload */
-	for (i = 0; i < 8; i += 2) {
-		val = readw(&reg->chl[obj].data[i]);
-		cf->data[7 - i] = (7 - i) < cf->can_dlc ? val : 0;
-		cf->data[6 - i] = (6 - i) < cf->can_dlc ? (val >> 8) : 0;
-	}
-
-	stats->rx_packets++;
-	stats->rx_bytes += cf->can_dlc;
-	netif_rx(skb);
-}
-
-static int bfin_can_err(struct net_device *dev, u16 isrc, u16 status)
-{
-	struct bfin_can_priv *priv = netdev_priv(dev);
-	struct bfin_can_regs __iomem *reg = priv->membase;
-	struct net_device_stats *stats = &dev->stats;
-	struct can_frame *cf;
-	struct sk_buff *skb;
-	enum can_state state = priv->can.state;
-
-	skb = alloc_can_err_skb(dev, &cf);
-	if (skb == NULL)
-		return -ENOMEM;
-
-	if (isrc & RMLIS) {
-		/* data overrun interrupt */
-		netdev_dbg(dev, "data overrun interrupt\n");
-		cf->can_id |= CAN_ERR_CRTL;
-		cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
-		stats->rx_over_errors++;
-		stats->rx_errors++;
-	}
-
-	if (isrc & BOIS) {
-		netdev_dbg(dev, "bus-off mode interrupt\n");
-		state = CAN_STATE_BUS_OFF;
-		cf->can_id |= CAN_ERR_BUSOFF;
-		priv->can.can_stats.bus_off++;
-		can_bus_off(dev);
-	}
-
-	if (isrc & EPIS) {
-		/* error passive interrupt */
-		netdev_dbg(dev, "error passive interrupt\n");
-		state = CAN_STATE_ERROR_PASSIVE;
-	}
-
-	if ((isrc & EWTIS) || (isrc & EWRIS)) {
-		netdev_dbg(dev, "Error Warning Transmit/Receive Interrupt\n");
-		state = CAN_STATE_ERROR_WARNING;
-	}
-
-	if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING ||
-				state == CAN_STATE_ERROR_PASSIVE)) {
-		u16 cec = readw(&reg->cec);
-		u8 rxerr = cec;
-		u8 txerr = cec >> 8;
-
-		cf->can_id |= CAN_ERR_CRTL;
-		if (state == CAN_STATE_ERROR_WARNING) {
-			priv->can.can_stats.error_warning++;
-			cf->data[1] = (txerr > rxerr) ?
-				CAN_ERR_CRTL_TX_WARNING :
-				CAN_ERR_CRTL_RX_WARNING;
-		} else {
-			priv->can.can_stats.error_passive++;
-			cf->data[1] = (txerr > rxerr) ?
-				CAN_ERR_CRTL_TX_PASSIVE :
-				CAN_ERR_CRTL_RX_PASSIVE;
-		}
-	}
-
-	if (status) {
-		priv->can.can_stats.bus_error++;
-
-		cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
-
-		if (status & BEF)
-			cf->data[2] |= CAN_ERR_PROT_BIT;
-		else if (status & FER)
-			cf->data[2] |= CAN_ERR_PROT_FORM;
-		else if (status & SER)
-			cf->data[2] |= CAN_ERR_PROT_STUFF;
-	}
-
-	priv->can.state = state;
-
-	stats->rx_packets++;
-	stats->rx_bytes += cf->can_dlc;
-	netif_rx(skb);
-
-	return 0;
-}
-
-static irqreturn_t bfin_can_interrupt(int irq, void *dev_id)
-{
-	struct net_device *dev = dev_id;
-	struct bfin_can_priv *priv = netdev_priv(dev);
-	struct bfin_can_regs __iomem *reg = priv->membase;
-	struct net_device_stats *stats = &dev->stats;
-	u16 status, isrc;
-
-	if ((irq == priv->tx_irq) && readw(&reg->mbtif2)) {
-		/* transmission complete interrupt */
-		writew(0xFFFF, &reg->mbtif2);
-		stats->tx_packets++;
-		stats->tx_bytes += readw(&reg->chl[TRANSMIT_CHL].dlc);
-		can_get_echo_skb(dev, 0);
-		netif_wake_queue(dev);
-	} else if ((irq == priv->rx_irq) && readw(&reg->mbrif1)) {
-		/* receive interrupt */
-		isrc = readw(&reg->mbrif1);
-		writew(0xFFFF, &reg->mbrif1);
-		bfin_can_rx(dev, isrc);
-	} else if ((irq == priv->err_irq) && readw(&reg->gis)) {
-		/* error interrupt */
-		isrc = readw(&reg->gis);
-		status = readw(&reg->esr);
-		writew(0x7FF, &reg->gis);
-		bfin_can_err(dev, isrc, status);
-	} else {
-		return IRQ_NONE;
-	}
-
-	return IRQ_HANDLED;
-}
-
-static int bfin_can_open(struct net_device *dev)
-{
-	struct bfin_can_priv *priv = netdev_priv(dev);
-	int err;
-
-	/* set chip into reset mode */
-	bfin_can_set_reset_mode(dev);
-
-	/* common open */
-	err = open_candev(dev);
-	if (err)
-		goto exit_open;
-
-	/* register interrupt handler */
-	err = request_irq(priv->rx_irq, &bfin_can_interrupt, 0,
-			"bfin-can-rx", dev);
-	if (err)
-		goto exit_rx_irq;
-	err = request_irq(priv->tx_irq, &bfin_can_interrupt, 0,
-			"bfin-can-tx", dev);
-	if (err)
-		goto exit_tx_irq;
-	err = request_irq(priv->err_irq, &bfin_can_interrupt, 0,
-			"bfin-can-err", dev);
-	if (err)
-		goto exit_err_irq;
-
-	bfin_can_start(dev);
-
-	netif_start_queue(dev);
-
-	return 0;
-
-exit_err_irq:
-	free_irq(priv->tx_irq, dev);
-exit_tx_irq:
-	free_irq(priv->rx_irq, dev);
-exit_rx_irq:
-	close_candev(dev);
-exit_open:
-	return err;
-}
-
-static int bfin_can_close(struct net_device *dev)
-{
-	struct bfin_can_priv *priv = netdev_priv(dev);
-
-	netif_stop_queue(dev);
-	bfin_can_set_reset_mode(dev);
-
-	close_candev(dev);
-
-	free_irq(priv->rx_irq, dev);
-	free_irq(priv->tx_irq, dev);
-	free_irq(priv->err_irq, dev);
-
-	return 0;
-}
-
-static struct net_device *alloc_bfin_candev(void)
-{
-	struct net_device *dev;
-	struct bfin_can_priv *priv;
-
-	dev = alloc_candev(sizeof(*priv), TX_ECHO_SKB_MAX);
-	if (!dev)
-		return NULL;
-
-	priv = netdev_priv(dev);
-
-	priv->dev = dev;
-	priv->can.bittiming_const = &bfin_can_bittiming_const;
-	priv->can.do_set_bittiming = bfin_can_set_bittiming;
-	priv->can.do_set_mode = bfin_can_set_mode;
-	priv->can.do_get_berr_counter = bfin_can_get_berr_counter;
-	priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
-
-	return dev;
-}
-
-static const struct net_device_ops bfin_can_netdev_ops = {
-	.ndo_open               = bfin_can_open,
-	.ndo_stop               = bfin_can_close,
-	.ndo_start_xmit         = bfin_can_start_xmit,
-	.ndo_change_mtu         = can_change_mtu,
-};
-
-static int bfin_can_probe(struct platform_device *pdev)
-{
-	int err;
-	struct net_device *dev;
-	struct bfin_can_priv *priv;
-	struct resource *res_mem, *rx_irq, *tx_irq, *err_irq;
-	unsigned short *pdata;
-
-	pdata = dev_get_platdata(&pdev->dev);
-	if (!pdata) {
-		dev_err(&pdev->dev, "No platform data provided!\n");
-		err = -EINVAL;
-		goto exit;
-	}
-
-	res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	rx_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	tx_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
-	err_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 2);
-	if (!res_mem || !rx_irq || !tx_irq || !err_irq) {
-		err = -EINVAL;
-		goto exit;
-	}
-
-	/* request peripheral pins */
-	err = peripheral_request_list(pdata, dev_name(&pdev->dev));
-	if (err)
-		goto exit;
-
-	dev = alloc_bfin_candev();
-	if (!dev) {
-		err = -ENOMEM;
-		goto exit_peri_pin_free;
-	}
-
-	priv = netdev_priv(dev);
-
-	priv->membase = devm_ioremap_resource(&pdev->dev, res_mem);
-	if (IS_ERR(priv->membase)) {
-		err = PTR_ERR(priv->membase);
-		goto exit_peri_pin_free;
-	}
-
-	priv->rx_irq = rx_irq->start;
-	priv->tx_irq = tx_irq->start;
-	priv->err_irq = err_irq->start;
-	priv->pin_list = pdata;
-	priv->can.clock.freq = get_sclk();
-
-	platform_set_drvdata(pdev, dev);
-	SET_NETDEV_DEV(dev, &pdev->dev);
-
-	dev->flags |= IFF_ECHO;	/* we support local echo */
-	dev->netdev_ops = &bfin_can_netdev_ops;
-
-	bfin_can_set_reset_mode(dev);
-
-	err = register_candev(dev);
-	if (err) {
-		dev_err(&pdev->dev, "registering failed (err=%d)\n", err);
-		goto exit_candev_free;
-	}
-
-	dev_info(&pdev->dev,
-		"%s device registered"
-		"(&reg_base=%p, rx_irq=%d, tx_irq=%d, err_irq=%d, sclk=%d)\n",
-		DRV_NAME, priv->membase, priv->rx_irq,
-		priv->tx_irq, priv->err_irq, priv->can.clock.freq);
-	return 0;
-
-exit_candev_free:
-	free_candev(dev);
-exit_peri_pin_free:
-	peripheral_free_list(pdata);
-exit:
-	return err;
-}
-
-static int bfin_can_remove(struct platform_device *pdev)
-{
-	struct net_device *dev = platform_get_drvdata(pdev);
-	struct bfin_can_priv *priv = netdev_priv(dev);
-
-	bfin_can_set_reset_mode(dev);
-
-	unregister_candev(dev);
-
-	peripheral_free_list(priv->pin_list);
-
-	free_candev(dev);
-	return 0;
-}
-
-#ifdef CONFIG_PM
-static int bfin_can_suspend(struct platform_device *pdev, pm_message_t mesg)
-{
-	struct net_device *dev = platform_get_drvdata(pdev);
-	struct bfin_can_priv *priv = netdev_priv(dev);
-	struct bfin_can_regs __iomem *reg = priv->membase;
-	int timeout = BFIN_CAN_TIMEOUT;
-
-	if (netif_running(dev)) {
-		/* enter sleep mode */
-		writew(readw(&reg->control) | SMR, &reg->control);
-		while (!(readw(&reg->intr) & SMACK)) {
-			udelay(10);
-			if (--timeout == 0) {
-				netdev_err(dev, "fail to enter sleep mode\n");
-				BUG();
-			}
-		}
-	}
-
-	return 0;
-}
-
-static int bfin_can_resume(struct platform_device *pdev)
-{
-	struct net_device *dev = platform_get_drvdata(pdev);
-	struct bfin_can_priv *priv = netdev_priv(dev);
-	struct bfin_can_regs __iomem *reg = priv->membase;
-
-	if (netif_running(dev)) {
-		/* leave sleep mode */
-		writew(0, &reg->intr);
-	}
-
-	return 0;
-}
-#else
-#define bfin_can_suspend NULL
-#define bfin_can_resume NULL
-#endif	/* CONFIG_PM */
-
-static struct platform_driver bfin_can_driver = {
-	.probe = bfin_can_probe,
-	.remove = bfin_can_remove,
-	.suspend = bfin_can_suspend,
-	.resume = bfin_can_resume,
-	.driver = {
-		.name = DRV_NAME,
-	},
-};
-
-module_platform_driver(bfin_can_driver);
-
-MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("Blackfin on-chip CAN netdevice driver");
-MODULE_ALIAS("platform:" DRV_NAME);
-- 
2.7.4