[PATCH v2 09/13] can: pruss CAN driver.

@@ -112,6 +112,7 @@ config PCH_CAN
 	  This driver can access CAN bus.
 
 source "drivers/net/can/mscan/Kconfig"
+source "drivers/net/can/da8xx_pruss/Kconfig"
 
 source "drivers/net/can/sja1000/Kconfig"
 

@@ -14,6 +14,7 @@ obj-$(CONFIG_CAN_SJA1000)	+= sja1000/
 obj-$(CONFIG_CAN_MSCAN)		+= mscan/
 obj-$(CONFIG_CAN_AT91)		+= at91_can.o
 obj-$(CONFIG_CAN_TI_HECC)	+= ti_hecc.o
+obj-$(CONFIG_CAN_TI_DA8XX_PRU)	+= da8xx_pruss/
 obj-$(CONFIG_CAN_MCP251X)	+= mcp251x.o
 obj-$(CONFIG_CAN_BFIN)		+= bfin_can.o
 obj-$(CONFIG_CAN_JANZ_ICAN3)	+= janz-ican3.o

@@ -0,0 +1,73 @@
+#
+# CAN Lite Kernel Configuration
+#
+config CAN_TI_DA8XX_PRU
+	depends on CAN_DEV && ARCH_DAVINCI && ARCH_DAVINCI_DA850
+	tristate "PRU based CAN emulation for DA8XX"
+	---help---
+	Enable this to emulate a CAN controller on the PRU of DA8XX.
+	If not sure, mark N
+
+config DA8XX_PRU_CANID_MBX0
+	hex "CANID for mailbox 0"
+	depends on CAN_TI_DA8XX_PRU
+	default "0x123"
+	---help---
+	Enter the CANID for mailbox 0
+	Default value is set to 0x123, change this as required.
+
+config DA8XX_PRU_CANID_MBX1
+	hex "CANID for mailbox 1"
+	depends on CAN_TI_DA8XX_PRU
+	default "0x123"
+	 ---help---
+	Enter the CANID for mailbox 1
+	Default value is set to 0x123, change this as required.
+
+config DA8XX_PRU_CANID_MBX2
+	hex "CANID for mailbox 2"
+	depends on CAN_TI_DA8XX_PRU
+	default "0x123"
+	---help---
+	Enter the CANID for mailbox 2
+	Default value is set to 0x123, change this as required.
+
+config DA8XX_PRU_CANID_MBX3
+	hex "CANID for mailbox 3"
+	depends on CAN_TI_DA8XX_PRU
+	default "0x123"
+	---help---
+	Enter the CANID for mailbox 3
+	Default value is set to 0x123, change this as required.
+
+config DA8XX_PRU_CANID_MBX4
+	hex "CANID for mailbox 4"
+	depends on CAN_TI_DA8XX_PRU
+	default "0x123"
+	---help---
+	Enter the CANID for mailbox 4
+	Default value is set to 0x123, change this as required.
+
+config DA8XX_PRU_CANID_MBX5
+	hex "CANID for mailbox 5"
+	depends on CAN_TI_DA8XX_PRU
+	default "0x123"
+	---help---
+	Enter the CANID for mailbox 5
+	Default value is set to 0x123, change this as required.
+
+config DA8XX_PRU_CANID_MBX6
+	hex "CANID for mailbox 6"
+	depends on CAN_TI_DA8XX_PRU
+	default "0x123"
+	---help---
+	Enter the CANID for mailbox 6
+	Default value is set to 0x123, change this as required.
+
+config DA8XX_PRU_CANID_MBX7
+	hex "CANID for mailbox 7"
+	depends on CAN_TI_DA8XX_PRU
+	default "0x123"
+	---help---
+	Enter the CANID for mailbox 7
+	Default value is set to 0x123, change this as required.

@@ -0,0 +1,7 @@
+#
+# Makefile for CAN Lite emulation
+#
+can_emu-objs :=   pruss_can.o \
+                  pruss_can_api.o
+
+obj-$(CONFIG_CAN_TI_DA8XX_PRU)    += can_emu.o

@@ -0,0 +1,758 @@
+/*
+ *  TI DA8XX PRU CAN Emulation device driver
+ *  Author: subhasish@mistralsolutions.com
+ *
+ *  This driver supports TI's PRU CAN Emulation and the
+ *  specs for the same is available at <http://www.ti.com>
+ *
+ *  Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License as
+ *  published by the Free Software Foundation version 2.
+ *
+ *  This program is distributed as is WITHOUT ANY WARRANTY of any
+ *  kind, whether express or implied; without even the implied warranty
+ *  of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/init.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/firmware.h>
+#include <linux/clk.h>
+#include <linux/types.h>
+
+#include <linux/can.h>
+#include <linux/can/dev.h>
+#include <linux/can/error.h>
+#include <mach/da8xx.h>
+#include "pruss_can_api.h"
+
+#define DRV_NAME "da8xx_pruss_can"
+#define DRV_DESC "TI PRU CAN Controller Driver v0.1"
+#define PRU_CAN_START		1
+#define PRU_CAN_STOP		0
+#define MB_MIN			0
+#define MB_MAX			7
+
+#define PRU_CANMID_IDE			BIT(29)	/* Extended frame format */
+
+#define PRU_CAN_ISR_BIT_CCI		BIT(15)
+#define PRU_CAN_ISR_BIT_ESI		BIT(14)
+#define PRU_CAN_ISR_BIT_SRDI		BIT(13)
+#define PRU_CAN_ISR_BIT_RRI		BIT(8)
+
+#define PRU_CAN_MBXSR_BIT_STATE		BIT(7)
+#define PRU_CAN_MBXSR_BIT_TC		BIT(6)
+#define PRU_CAN_MBXSR_BIT_ERR		BIT(5)
+#define PRU_CAN_MBXSR_BIT_OF		BIT(0)
+
+#define PRU_CAN_GSR_BIT_TXM		BIT(7)
+#define PRU_CAN_GSR_BIT_RXM		BIT(6)
+#define PRU_CAN_GSR_BIT_CM		BIT(5)
+#define PRU_CAN_GSR_BIT_EPM		BIT(4)
+#define PRU_CAN_GSR_BIT_BFM		BIT(3)
+#define RTR_MBX_NO			8
+#define MAX_INIT_RETRIES		20
+#define L138_PRU_ARM_FREQ		312000
+#define DFLT_PRU_FREQ			156000000
+#define DFLT_PRU_BITRATE		125000
+
+#define CONFIG_DA8XX_PRU_CANID_MBX0	0x123
+#define CONFIG_DA8XX_PRU_CANID_MBX1	0x123
+#define CONFIG_DA8XX_PRU_CANID_MBX2	0x123
+#define CONFIG_DA8XX_PRU_CANID_MBX3	0x123
+#define CONFIG_DA8XX_PRU_CANID_MBX4	0x123
+#define CONFIG_DA8XX_PRU_CANID_MBX5	0x123
+#define CONFIG_DA8XX_PRU_CANID_MBX6	0x123
+#define CONFIG_DA8XX_PRU_CANID_MBX7	0x123
+
+#ifdef __CAN_DEBUG
+#define __can_debug(fmt, args...) printk(KERN_DEBUG "can_debug: " fmt, ## args)
+#else
+#define __can_debug(fmt, args...)
+#endif
+#define __can_err(fmt, args...) printk(KERN_ERR "can_err: " fmt, ## args)
+
+/*
+ * omapl_pru can private data
+ */
+struct omapl_pru_can_priv {
+	struct can_priv can;
+	struct workqueue_struct *pru_can_wQ;
+	struct work_struct rx_work;
+	struct net_device *ndev;
+	struct device *dev; /* pdev->dev */
+	struct clk *clk_timer;
+	u32 timer_freq;
+	can_emu_app_hndl can_tx_hndl;
+	can_emu_app_hndl can_rx_hndl;
+	const struct firmware *fw_rx;
+	const struct firmware *fw_tx;
+	spinlock_t mbox_lock;
+	u32 trx_irq;
+	u32 tx_head;
+	u32 tx_tail;
+	u32 tx_next;
+	u32 rx_next;
+};
+
+static int omapl_pru_can_get_state(const struct net_device *ndev,
+				   enum can_state *state)
+{
+	struct omapl_pru_can_priv *priv = netdev_priv(ndev);
+	*state = priv->can.state;
+	return 0;
+}
+
+static int omapl_pru_can_set_bittiming(struct net_device *ndev)
+{
+	struct omapl_pru_can_priv *priv = netdev_priv(ndev);
+	struct can_bittiming *bt = &priv->can.bittiming;
+	long bit_error = 0;
+
+	if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) {
+		dev_warn(priv->dev, "WARN: Triple"
+			 "sampling not set due to h/w limitations");
+	}
+	if (pru_can_calc_timing(priv->dev, priv->can.clock.freq,
+				bt->bitrate) != 0)
+		return -EINVAL;
+	bit_error =
+	    (((priv->timer_freq / (priv->timer_freq / bt->bitrate)) -
+	      bt->bitrate) * 1000) / bt->bitrate;
+	if (bit_error) {
+		bit_error =
+		    (((priv->timer_freq / (priv->timer_freq / bt->bitrate)) -
+		      bt->bitrate) * 1000000) / bt->bitrate;
+		printk(KERN_INFO "\nBitrate error %ld.%ld%%\n",
+			bit_error / 10000, bit_error % 1000);
+	} else
+		printk(KERN_INFO "\nBitrate error 0.0%%\n");
+
+	return 0;
+}
+
+static void omapl_pru_can_stop(struct net_device *ndev)
+{
+	struct omapl_pru_can_priv *priv = netdev_priv(ndev);
+	u16 int_mask = 0;
+
+	pru_can_mask_ints(priv->dev, int_mask);	/* mask all ints */
+	pru_can_start_abort_tx(priv->dev, PRU_CAN_STOP);
+	priv->can.state = CAN_STATE_STOPPED;
+}
+
+/*
+ * This is to just set the can state to ERROR_ACTIVE
+ *	ip link set canX up type can bitrate 125000
+ */
+static void omapl_pru_can_start(struct net_device *ndev)
+{
+	struct omapl_pru_can_priv *priv = netdev_priv(ndev);
+	u16 int_mask = 0xFFFF;
+
+	if (priv->can.state != CAN_STATE_STOPPED)
+		omapl_pru_can_stop(ndev);
+
+	pru_can_mask_ints(priv->dev, int_mask);	/* unmask all ints */
+
+	pru_can_get_global_status(priv->dev, &priv->can_tx_hndl);
+	pru_can_get_global_status(priv->dev, &priv->can_rx_hndl);
+
+	if (PRU_CAN_GSR_BIT_EPM & priv->can_tx_hndl.u32globalstatus)
+		priv->can.state = CAN_STATE_ERROR_PASSIVE;
+	else if (PRU_CAN_GSR_BIT_BFM & priv->can_tx_hndl.u32globalstatus)
+		priv->can.state = CAN_STATE_BUS_OFF;
+	else
+		priv->can.state = CAN_STATE_ERROR_ACTIVE;
+}
+
+static int omapl_pru_can_set_mode(struct net_device *ndev, enum can_mode mode)
+{
+	int ret = 0;
+
+	switch (mode) {
+	case CAN_MODE_START:
+		omapl_pru_can_start(ndev);
+		if (netif_queue_stopped(ndev))
+			netif_wake_queue(ndev);
+		break;
+	case CAN_MODE_STOP:
+		omapl_pru_can_stop(ndev);
+		if (!netif_queue_stopped(ndev))
+			netif_stop_queue(ndev);
+		break;
+	default:
+		ret = -EOPNOTSUPP;
+		break;
+	}
+	return ret;
+}
+
+static netdev_tx_t omapl_pru_can_start_xmit(struct sk_buff *skb,
+					    struct net_device *ndev)
+{
+	struct omapl_pru_can_priv *priv = netdev_priv(ndev);
+	struct can_frame *cf = (struct can_frame *)skb->data;
+	int count;
+	u8 *data = cf->data;
+	u8 dlc = cf->can_dlc;
+	u8 *ptr8data = NULL;
+
+	netif_stop_queue(ndev);
+	if (cf->can_id & CAN_EFF_FLAG)	/* Extended frame format */
+		*((u32 *) &priv->can_tx_hndl.strcanmailbox) =
+		    (cf->can_id & CAN_EFF_MASK) | PRU_CANMID_IDE;
+	else			/* Standard frame format */
+		*((u32 *) &priv->can_tx_hndl.strcanmailbox) =
+		    (cf->can_id & CAN_SFF_MASK) << 18;
+
+	if (cf->can_id & CAN_RTR_FLAG)	/* Remote transmission request */
+		*((u32 *) &priv->can_tx_hndl.strcanmailbox) |= CAN_RTR_FLAG;
+
+	ptr8data = &priv->can_tx_hndl.strcanmailbox.u8data7 + (dlc - 1);
+	for (count = 0; count < (u8) dlc; count++) {
+		*ptr8data-- = *data++;
+	}
+	*((u32 *) &priv->can_tx_hndl.strcanmailbox.u16datalength) = (u32) dlc;
+/*
+ * search for the next available mbx
+ * if the next mbx is busy, then try the next + 1
+ * do this until the head is reached.
+ * if still unable to tx, stop accepting any packets
+ * if able to tx and the head is reached, then reset next to tail, i.e mbx0
+ * if head is not reached, then just point to the next mbx
+ */
+	for (; priv->tx_next <= priv->tx_head; priv->tx_next++) {
+		priv->can_tx_hndl.ecanmailboxnumber =
+		    (can_mailbox_number) priv->tx_next;
+		if (-1 == pru_can_write_data_to_mailbox(priv->dev,
+					&priv->can_tx_hndl)) {
+			if (priv->tx_next == priv->tx_head) {
+				priv->tx_next = priv->tx_tail;
+				if (!netif_queue_stopped(ndev))
+					netif_stop_queue(ndev);	/* IF stalled */
+				dev_err(priv->dev,
+					"%s: no tx mbx available", __func__);
+				return NETDEV_TX_BUSY;
+			} else
+				continue;
+		} else {
+			/* set transmit request */
+			pru_can_tx(priv->dev, priv->tx_next, CAN_TX_PRU_1);
+			pru_can_tx_mode_set(priv->dev, false, ecanreceive);
+			pru_can_tx_mode_set(priv->dev, true, ecantransmit);
+			pru_can_start_abort_tx(priv->dev, PRU_CAN_START);
+			priv->tx_next++;
+			can_put_echo_skb(skb, ndev, 0);
+			break;
+		}
+	}
+	if (priv->tx_next > priv->tx_head) {
+		priv->tx_next = priv->tx_tail;
+	}
+	return NETDEV_TX_OK;
+}
+
+static int omapl_pru_can_rx(struct net_device *ndev, u32 mbxno)
+{
+	struct omapl_pru_can_priv *priv = netdev_priv(ndev);
+	struct net_device_stats *stats = &ndev->stats;
+	struct can_frame *cf;
+	struct sk_buff *skb;
+	u32 pru_can_mbx_data;
+	u8 *data = NULL;
+	u8 *ptr8data = NULL;
+	int count = 0;
+
+	skb = alloc_can_skb(ndev, &cf);
+	if (!skb) {
+		if (printk_ratelimit())
+			dev_err(priv->dev,
+				"alloc_can_skb() failed\n");
+		return -ENOMEM;
+	}
+	data = cf->data;
+	/*      get payload */
+	priv->can_rx_hndl.ecanmailboxnumber = (can_mailbox_number) mbxno;
+	if (pru_can_get_data_from_mailbox(priv->dev, &priv->can_rx_hndl)) {
+		__can_err("failed to get data from mailbox\n");
+		return -EAGAIN;
+	}
+	/* give ownweship to pru */
+	pru_can_tx(priv->dev, mbxno, CAN_RX_PRU_0);
+
+	/* get data length code */
+	cf->can_dlc =
+	    get_can_dlc(*
+			((u32 *) &priv->can_rx_hndl.strcanmailbox.
+			 u16datalength) & 0xF);
+	if (cf->can_dlc <= 4) {
+		ptr8data =
+		    &priv->can_rx_hndl.strcanmailbox.u8data3 + (4 -
+								cf->can_dlc);
+		for (count = 0; count < cf->can_dlc; count++) {
+			*data++ = *ptr8data++;
+		}
+	} else {
+		ptr8data = &priv->can_rx_hndl.strcanmailbox.u8data3;
+		for (count = 0; count < 4; count++) {
+			*data++ = *ptr8data++;
+		}
+		ptr8data =
+		    &priv->can_rx_hndl.strcanmailbox.u8data4 - (cf->can_dlc -
+								5);
+		for (count = 0; count < cf->can_dlc - 4; count++) {
+			*data++ = *ptr8data++;
+		}
+	}
+
+	pru_can_mbx_data = *((u32 *) &priv->can_rx_hndl.strcanmailbox);
+	/* get id extended or std */
+	if (pru_can_mbx_data & PRU_CANMID_IDE)
+		cf->can_id = (pru_can_mbx_data & CAN_EFF_MASK) | CAN_EFF_FLAG;
+	else
+		cf->can_id = (pru_can_mbx_data >> 18) & CAN_SFF_MASK;
+
+	if (pru_can_mbx_data & CAN_RTR_FLAG)
+		cf->can_id |= CAN_RTR_FLAG;
+
+	netif_rx_ni(skb);
+	stats->rx_packets++;
+	stats->rx_bytes += cf->can_dlc;
+	return 0;
+}
+
+static int omapl_pru_can_err(struct net_device *ndev, int int_status,
+			     int err_status)
+{
+	struct omapl_pru_can_priv *priv = netdev_priv(ndev);
+	struct net_device_stats *stats = &ndev->stats;
+	struct can_frame *cf;
+	struct sk_buff *skb;
+	int tx_err_cnt, rx_err_cnt;
+
+	/* propogate the error condition to the can stack */
+	skb = alloc_can_err_skb(ndev, &cf);
+	if (!skb) {
+		if (printk_ratelimit())
+			dev_err(priv->dev,
+				"alloc_can_err_skb() failed\n");
+		return -ENOMEM;
+	}
+
+	if (err_status & PRU_CAN_GSR_BIT_EPM) {	/* error passive int */
+		priv->can.state = CAN_STATE_ERROR_PASSIVE;
+		++priv->can.can_stats.error_passive;
+		cf->can_id |= CAN_ERR_CRTL;
+		tx_err_cnt = pru_can_get_error_cnt(priv->dev, CAN_TX_PRU_1);
+		rx_err_cnt = pru_can_get_error_cnt(priv->dev, CAN_RX_PRU_0);
+		if (tx_err_cnt > 127)
+			cf->data[1] |= CAN_ERR_CRTL_TX_PASSIVE;
+		if (rx_err_cnt > 127)
+			cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE;
+
+		dev_dbg(priv->ndev->dev.parent, "Error passive interrupt\n");
+	}
+
+	if (err_status & PRU_CAN_GSR_BIT_BFM) {
+		priv->can.state = CAN_STATE_BUS_OFF;
+		cf->can_id |= CAN_ERR_BUSOFF;
+		/*
+		 *      Disable all interrupts in bus-off to avoid int hog
+		 *      this should be handled by the pru
+		 */
+		pru_can_mask_ints(priv->dev, 0xFFFF);
+		can_bus_off(ndev);
+		dev_dbg(priv->ndev->dev.parent, "Bus off mode\n");
+	}
+
+	netif_rx(skb);
+	stats->rx_packets++;
+	stats->rx_bytes += cf->can_dlc;
+	return 0;
+}
+
+void omapl_pru_can_rx_wQ(struct work_struct *work)
+{
+	struct omapl_pru_can_priv *priv = container_of(work,
+			struct omapl_pru_can_priv, rx_work);
+	struct net_device *ndev = priv->ndev;
+	u32 bit_set, mbxno = 0;
+
+	if (-1 == pru_can_get_intr_status(priv->dev, &priv->can_rx_hndl))
+		return;
+
+	if (PRU_CAN_ISR_BIT_RRI & priv->can_rx_hndl.u32interruptstatus) {
+		mbxno = RTR_MBX_NO;
+		omapl_pru_can_rx(ndev, mbxno);
+	} else {
+		/* Extract the mboxno from the status */
+		for (bit_set = 0; ((priv->can_rx_hndl.u32interruptstatus & 0xFF)
+						>> bit_set != 0); bit_set++)
+		;
+		if (0 == bit_set) {
+			dev_err(priv->dev,
+				"%s: invalid mailbox number: %X\n", __func__,
+				priv->can_rx_hndl.u32interruptstatus);
+		} else {
+			mbxno = bit_set - 1;
+			if (PRU_CAN_ISR_BIT_ESI & priv->can_rx_hndl.
+			    u32interruptstatus) {
+				pru_can_get_global_status(priv->dev,
+					&priv->can_rx_hndl);
+				omapl_pru_can_err(ndev,
+				priv->can_rx_hndl.u32interruptstatus,
+				priv->can_rx_hndl.u32globalstatus);
+			} else {
+				omapl_pru_can_rx(ndev, mbxno);
+			}
+		}
+	}
+}
+
+irqreturn_t omapl_tx_can_intr(int irq, void *dev_id)
+{
+	struct net_device *ndev = dev_id;
+	struct omapl_pru_can_priv *priv = netdev_priv(ndev);
+	struct net_device_stats *stats = &ndev->stats;
+	u32 bit_set, mbxno;
+
+	pru_can_get_intr_status(priv->dev, &priv->can_tx_hndl);
+	if ((PRU_CAN_ISR_BIT_CCI & priv->can_tx_hndl.u32interruptstatus)
+	    || (PRU_CAN_ISR_BIT_SRDI & priv->can_tx_hndl.u32interruptstatus)) {
+		__can_debug("tx_int_status = 0x%X\n",
+			    priv->can_tx_hndl.u32interruptstatus);
+		can_free_echo_skb(ndev, 0);
+	} else {
+		for (bit_set = 0; ((priv->can_tx_hndl.u32interruptstatus & 0xFF)
+						>> bit_set != 0); bit_set++)
+		;
+		if (0 == bit_set) {
+			__can_err("%s: invalid mailbox number\n", __func__);
+			can_free_echo_skb(ndev, 0);
+		} else {
+			mbxno = bit_set - 1;	/* mail box numbering starts from 0 */
+			if (PRU_CAN_ISR_BIT_ESI & priv->can_tx_hndl.
+			    u32interruptstatus) {
+				/* read gsr and ack pru */
+				pru_can_get_global_status(priv->dev, &priv->can_tx_hndl);
+				omapl_pru_can_err(ndev,
+						  priv->can_tx_hndl.
+						  u32interruptstatus,
+						  priv->can_tx_hndl.
+						  u32globalstatus);
+			} else {
+				stats->tx_packets++;
+				/* stats->tx_bytes += dlc; */
+				/*can_get_echo_skb(ndev, 0);*/
+			}
+		}
+	}
+	if (netif_queue_stopped(ndev))
+		netif_wake_queue(ndev);
+
+	can_get_echo_skb(ndev, 0);
+	pru_can_tx_mode_set(priv->dev, true, ecanreceive);
+	return IRQ_HANDLED;
+}
+
+irqreturn_t omapl_rx_can_intr(int irq, void *dev_id)
+{
+
+	struct net_device *ndev = dev_id;
+	struct omapl_pru_can_priv *priv = netdev_priv(ndev);
+	u32 intc_status = 0;
+
+	intc_status = pru_can_get_intc_status(priv->dev);
+	if (intc_status & 4)
+		return omapl_tx_can_intr(irq, dev_id);
+	if (intc_status & 2) {
+		if (!work_pending(&priv->rx_work))
+			queue_work(priv->pru_can_wQ, &priv->rx_work);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int omapl_pru_can_open(struct net_device *ndev)
+{
+	struct omapl_pru_can_priv *priv = netdev_priv(ndev);
+	int err;
+
+	/* register interrupt handler */
+	err = request_irq(priv->trx_irq, &omapl_rx_can_intr, IRQF_SHARED,
+			  "pru_can_irq", ndev);
+	if (err) {
+		dev_err(priv->dev, "error requesting rx interrupt\n");
+		goto exit_trx_irq;
+	}
+	/* common open */
+	err = open_candev(ndev);
+	if (err) {
+		dev_err(priv->dev, "open_candev() failed %d\n", err);
+		goto exit_open;
+	}
+
+	pru_can_emu_init(priv->dev, priv->can.clock.freq);
+	priv->tx_tail = MB_MIN;
+	priv->tx_head = MB_MAX;
+
+	pru_can_rx_id_map(priv->dev, CONFIG_DA8XX_PRU_CANID_MBX0, 0);
+	pru_can_rx_id_map(priv->dev, CONFIG_DA8XX_PRU_CANID_MBX1, 1);
+	pru_can_rx_id_map(priv->dev, CONFIG_DA8XX_PRU_CANID_MBX2, 2);
+	pru_can_rx_id_map(priv->dev, CONFIG_DA8XX_PRU_CANID_MBX3, 3);
+	pru_can_rx_id_map(priv->dev, CONFIG_DA8XX_PRU_CANID_MBX4, 4);
+	pru_can_rx_id_map(priv->dev, CONFIG_DA8XX_PRU_CANID_MBX5, 5);
+	pru_can_rx_id_map(priv->dev, CONFIG_DA8XX_PRU_CANID_MBX6, 6);
+	pru_can_rx_id_map(priv->dev, CONFIG_DA8XX_PRU_CANID_MBX7, 7);
+
+	omapl_pru_can_start(ndev);
+	netif_start_queue(ndev);
+	return 0;
+
+exit_open:
+	free_irq(priv->trx_irq, ndev);
+exit_trx_irq:
+	return err;
+}
+
+static int omapl_pru_can_close(struct net_device *ndev)
+{
+	struct omapl_pru_can_priv *priv = netdev_priv(ndev);
+
+	if (!netif_queue_stopped(ndev))
+		netif_stop_queue(ndev);
+
+	close_candev(ndev);
+
+	free_irq(priv->trx_irq, ndev);
+	return 0;
+}
+
+static const struct net_device_ops omapl_pru_can_netdev_ops = {
+	.ndo_open		= omapl_pru_can_open,
+	.ndo_stop		= omapl_pru_can_close,
+	.ndo_start_xmit		= omapl_pru_can_start_xmit,
+};
+
+static int __devinit omapl_pru_can_probe(struct platform_device *pdev)
+{
+	struct net_device *ndev = NULL;
+	const struct da8xx_pru_can_data *pdata;
+	struct omapl_pru_can_priv *priv = NULL;
+	struct device *dev = &pdev->dev;
+	u32 err;
+
+	pdata = dev->platform_data;
+	if (!pdata) {
+		dev_err(&pdev->dev, "platform data not found\n");
+		return -EINVAL;
+	}
+
+	ndev = alloc_candev(sizeof(struct omapl_pru_can_priv), MB_MAX + 1);
+	if (!ndev) {
+		dev_err(&pdev->dev, "alloc_candev failed\n");
+		err = -ENOMEM;
+		goto probe_exit;
+	}
+	priv = netdev_priv(ndev);
+
+	priv->trx_irq = platform_get_irq(to_platform_device(dev->parent), 0);
+	if (!priv->trx_irq) {
+		dev_err(&pdev->dev, "unable to get pru interrupt resources!\n");
+		err = -ENODEV;
+		goto probe_exit;
+	}
+
+	priv->ndev = ndev;
+	priv->dev = dev; /* priv->dev = pdev->dev */
+
+	priv->can.bittiming_const = NULL;
+	priv->can.do_set_bittiming = omapl_pru_can_set_bittiming;
+	priv->can.do_set_mode = omapl_pru_can_set_mode;
+	priv->can.do_get_state = omapl_pru_can_get_state;
+	priv->can_tx_hndl.u8prunumber = CAN_TX_PRU_1;
+	priv->can_rx_hndl.u8prunumber = CAN_RX_PRU_0;
+
+	/* we support local echo, no arp */
+	ndev->flags |= (IFF_ECHO | IFF_NOARP);
+
+	/* pdev->dev->device_private->driver_data = ndev */
+	platform_set_drvdata(pdev, ndev);
+	SET_NETDEV_DEV(ndev, &pdev->dev);
+	ndev->netdev_ops = &omapl_pru_can_netdev_ops;
+
+	priv->can.clock.freq = pruss_get_clk_freq(priv->dev);
+
+	priv->clk_timer = clk_get(&pdev->dev, "pll1_sysclk2");
+	if (IS_ERR(priv->clk_timer)) {
+		dev_err(&pdev->dev, "no timer clock available\n");
+		err = PTR_ERR(priv->clk_timer);
+		priv->clk_timer = NULL;
+		goto probe_exit_candev;
+	}
+	priv->timer_freq = clk_get_rate(priv->clk_timer);
+
+	err = register_candev(ndev);
+	if (err) {
+		dev_err(&pdev->dev, "register_candev() failed\n");
+		err = -ENODEV;
+		goto probe_exit_clk;
+	}
+
+	err = request_firmware(&priv->fw_tx, "PRU_CAN_Emulation_Tx.bin",
+			&pdev->dev);
+	if (err) {
+		dev_err(&pdev->dev, "can't load firmware\n");
+		err = -ENODEV;
+		goto probe_exit_clk;
+	}
+
+	dev_info(&pdev->dev, "fw_tx size %d. downloading...\n",
+		 priv->fw_tx->size);
+
+	err = request_firmware(&priv->fw_rx, "PRU_CAN_Emulation_Rx.bin",
+			&pdev->dev);
+	if (err) {
+		dev_err(&pdev->dev, "can't load firmware\n");
+		err = -ENODEV;
+		goto probe_release_fw;
+	}
+	dev_info(&pdev->dev, "fw_rx size %d. downloading...\n",
+		 priv->fw_rx->size);
+
+	/* init the pru */
+	pru_can_emu_init(priv->dev, priv->can.clock.freq);
+	udelay(200);
+
+	pruss_enable(priv->dev, CAN_RX_PRU_0);
+	pruss_enable(priv->dev, CAN_TX_PRU_1);
+
+	/* download firmware into pru */
+	err = pruss_load(priv->dev, CAN_RX_PRU_0,
+		(u32 *)priv->fw_rx->data, (priv->fw_rx->size / 4));
+	if (err) {
+		dev_err(&pdev->dev, "firmware download error\n");
+		err = -ENODEV;
+		goto probe_release_fw_1;
+	}
+	err = pruss_load(priv->dev, CAN_TX_PRU_1,
+		(u32 *)priv->fw_tx->data, (priv->fw_tx->size / 4));
+	if (err) {
+		dev_err(&pdev->dev, "firmware download error\n");
+		err = -ENODEV;
+		goto probe_release_fw_1;
+	}
+
+	if (pru_can_calc_timing(priv->dev, DFLT_PRU_FREQ,
+				DFLT_PRU_BITRATE) != 0)
+		return -EINVAL;
+
+	pruss_run(priv->dev, CAN_RX_PRU_0);
+	pruss_run(priv->dev, CAN_TX_PRU_1);
+
+	/*Create The Work Queue */
+	priv->pru_can_wQ = create_freezeable_workqueue("omapl_pru_wQ");
+	if (priv->pru_can_wQ == NULL) {
+		dev_err(&pdev->dev, "failed to create work queue\n");
+		err = -ENODEV;
+		goto probe_release_fw_1;
+	}
+
+	INIT_WORK(&priv->rx_work, omapl_pru_can_rx_wQ);
+	dev_info(&pdev->dev,
+		 "%s device registered (trx_irq = %d,  clk = %d)\n",
+		 DRV_NAME, priv->trx_irq, priv->can.clock.freq);
+
+	return 0;
+
+probe_release_fw_1:
+	release_firmware(priv->fw_rx);
+probe_release_fw:
+	release_firmware(priv->fw_tx);
+probe_exit_clk:
+	clk_put(priv->clk_timer);
+probe_exit_candev:
+	if (NULL != ndev)
+		free_candev(ndev);
+probe_exit:
+	return err;
+}
+
+static int __devexit omapl_pru_can_remove(struct platform_device *pdev)
+{
+	struct net_device *ndev = platform_get_drvdata(pdev);
+	struct omapl_pru_can_priv *priv = netdev_priv(ndev);
+
+	omapl_pru_can_stop(ndev);
+
+	pru_can_emu_exit(priv->dev);
+	release_firmware(priv->fw_tx);
+	release_firmware(priv->fw_rx);
+	clk_put(priv->clk_timer);
+	flush_workqueue(priv->pru_can_wQ);
+	destroy_workqueue(priv->pru_can_wQ);
+	unregister_candev(ndev);
+	free_candev(ndev);
+	platform_set_drvdata(pdev, NULL);
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int omapl_pru_can_suspend(struct platform_device *pdev,
+			pm_message_t mesg)
+{
+	dev_info(&pdev->dev, "%s not yet implemented\n", __func__);
+	return 0;
+}
+
+static int omapl_pru_can_resume(struct platform_device *pdev)
+{
+	dev_info(&pdev->dev, "%s not yet implemented\n", __func__);
+	return 0;
+}
+#else
+#define omapl_pru_can_suspend NULL
+#define omapl_pru_can_resume NULL
+#endif /* CONFIG_PM */
+
+static struct platform_driver omapl_pru_can_driver = {
+	.probe		= omapl_pru_can_probe,
+	.remove		= __devexit_p(omapl_pru_can_remove),
+	.suspend	= omapl_pru_can_suspend,
+	.resume		= omapl_pru_can_resume,
+	.driver		= {
+		.name	= DRV_NAME,
+		.owner	= THIS_MODULE,
+	},
+};
+
+static int __init omapl_pru_can_init(void)
+{
+	__can_debug(KERN_INFO DRV_DESC "\n");
+	return platform_driver_register(&omapl_pru_can_driver);
+}
+
+module_init(omapl_pru_can_init);
+
+static void __exit omapl_pru_can_exit(void)
+{
+	__can_debug(KERN_INFO DRV_DESC " unloaded\n");
+	platform_driver_unregister(&omapl_pru_can_driver);
+}
+
+module_exit(omapl_pru_can_exit);
+
+MODULE_AUTHOR("Subhasish Ghosh <subhasish@mistralsolutions.com>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("omapl pru CAN netdevice driver");

@@ -0,0 +1,1227 @@
+/*
+ * Copyright (C) 2010 Texas Instruments Incorporated
+ * Author: Wilfred Felix
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as  published by the
+ * Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
+ * whether express or implied; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#include "pruss_can_api.h"
+
+static can_emu_drv_inst gstr_can_inst[ecanmaxinst];
+
+/*
+ * pru_can_set_brp()	Updates the  BRP register of PRU0
+ * and PRU1 of OMAP L138. This API will be called by the
+ * Application to updtae the BRP register of PRU0 and PRU1
+ *
+ * param	u16bitrateprescaler		The can bus bitrate
+ * prescaler value be set
+ *
+ * return   SUCCESS or FAILURE
+ */
+s16 pru_can_set_brp(struct device *dev, u16 u16bitrateprescaler)
+{
+
+	u32 u32offset;
+
+	if (u16bitrateprescaler > 255) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_RX_CLOCK_BRP_REGISTER);
+	pruss_writel(dev, u32offset, (u32 *) &u16bitrateprescaler, 1);
+
+	u32offset = (PRU_CAN_TX_CLOCK_BRP_REGISTER);
+	pruss_writel(dev, u32offset, (u32 *) &u16bitrateprescaler, 1);
+
+	return 0;
+
+}
+
+/*
+ * pru_can_set_bit_timing()		Updates the timing register
+ * of PRU0 and PRU1 of OMAP L138. This API will be called by
+ * the Application to updtae the timing register of PRU0 and PRU1
+ *
+ * param	pstrbittiming		Pointer to structure holding
+ * the bit timing values for can bus.
+ *
+ * return   SUCCESS or FAILURE
+ */
+s16 pru_can_set_bit_timing(struct device *dev,
+		can_bit_timing_consts *pstrbittiming)
+{
+
+	u32 u32offset;
+	u32 u32serregister;
+
+	u32serregister = 0;
+
+	if (pstrbittiming == NULL) {
+		return -1;
+	}
+
+	if ((pstrbittiming->u8syncjumpwidth > PRU_CAN_MAX_SJW) ||
+	    (pstrbittiming->u8phseg1 > PRU_CAN_MAX_PHSEG1) ||
+	    (pstrbittiming->u8phseg2 > PRU_CAN_MAX_PHSEG2)) {
+		return -1;
+	}
+
+	u32serregister = u32serregister |
+			((pstrbittiming->u8syncjumpwidth << 7) |
+			(pstrbittiming->u8phseg1 << 3) |
+			(pstrbittiming->u8phseg2));
+
+	u32offset = (PRU_CAN_TX_TIMING_REGISTER);
+	pruss_writel(dev, u32offset, (u32 *) &u32serregister, 1);
+
+	u32offset = (PRU_CAN_RX_TIMING_REGISTER);
+	pruss_writel(dev, u32offset, (u32 *) &u32serregister, 1);
+
+	return 0;
+}
+
+
+/*
+ * pru_can_calc_timing()
+ * Updates the  timing values of PRU0 and PRU1 of OMAP L138.
+ * This API will be called by the
+ * Application to updtae the timing values of PRU0 and PRU1
+ *
+ * return   SUCCESS or FAILURE
+ */
+
+s16 pru_can_calc_timing(struct device *dev, u32 pru_freq, u32 bit_rate)
+{
+	u16 u16phaseseg1;
+	u16 u16phaseseg2;
+	u32 u32offset;
+	u32 u32timing_value;
+	u32 u32setup_value;
+	u32timing_value = TIMER_CLK_FREQ / bit_rate;
+	u32offset = (PRU_CAN_TIMING_VAL_TX);
+	pruss_writel(dev, u32offset, (u32 *) &u32timing_value, 4);
+	pruss_readl(dev, u32offset, (u32 *) &u32timing_value, 4);
+	u32setup_value =
+	    (GPIO_SETUP_DELAY * (pru_freq / 1000000) / 1000) /
+	    DELAY_LOOP_LENGTH;
+	u32offset = (PRU_CAN_TIMING_VAL_TX_SJW);
+	pruss_writel(dev, u32offset, (u32 *) &u32setup_value, 4);
+	u16phaseseg1 = (u16) (u32timing_value / 2);
+	u16phaseseg2 = u32timing_value - u16phaseseg1;
+	u16phaseseg1 -= TIMER_SETUP_DELAY;
+	u16phaseseg2 -= TIMER_SETUP_DELAY;
+	u32setup_value = (u16phaseseg1 << 16) | u16phaseseg2;
+	u32offset = (PRU_CAN_TIMING_VAL_RX);
+	pruss_writel(dev, u32offset, (u32 *) &u32setup_value, 4);
+	u32offset = (PRU_CAN_TIMING_VAL_RX + 4);
+	pruss_writel(dev, u32offset, (u32 *) &u32timing_value, 4);
+
+	return 0;
+}
+
+/*
+ * pru_can_write_data_to_mailbox()
+ * Updates the transmit mailboxes of PRU1 of OMAP L138.
+ * This API will be called by the Application to update
+ * the transmit mailboxes of PRU1
+ *
+ * param  pu16canframedata	Can mailbox data buffer
+ *
+ * param  u8mailboxnum		Mailbox to be updated
+ *
+ * return SUCCESS or FAILURE
+ */
+s16 pru_can_write_data_to_mailbox(struct device *dev,
+			can_emu_app_hndl *pstremuapphndl)
+{
+	s16 s16subrtnretval;
+	u32 u32offset;
+
+	if (pstremuapphndl == NULL) {
+		return -1;
+	}
+
+	switch ((u8) pstremuapphndl->ecanmailboxnumber) {
+	case 0:
+		u32offset = (PRU_CAN_TX_MAILBOX0);
+		break;
+	case 1:
+		u32offset = (PRU_CAN_TX_MAILBOX1);
+		break;
+	case 2:
+		u32offset = (PRU_CAN_TX_MAILBOX2);
+		break;
+	case 3:
+		u32offset = (PRU_CAN_TX_MAILBOX3);
+		break;
+	case 4:
+		u32offset = (PRU_CAN_TX_MAILBOX4);
+		break;
+	case 5:
+		u32offset = (PRU_CAN_TX_MAILBOX5);
+		break;
+	case 6:
+		u32offset = (PRU_CAN_TX_MAILBOX6);
+		break;
+	case 7:
+		u32offset = (PRU_CAN_TX_MAILBOX7);
+		break;
+	default:
+		return -1;
+	}
+
+	s16subrtnretval = pruss_writel(dev, u32offset,
+		(u32 *) &(pstremuapphndl->strcanmailbox), 4);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+	return 0;
+}
+
+/*
+ * pru_can_get_data_from_mailbox()
+ * Receive data from the receive mailboxes of PRU0  of OMAP L138.
+ * This API will be called by the Application to get data from
+ * the receive mailboxes of PRU0
+ *
+ * param  pu16canframedata	Can mailbox data buffer
+ *
+ * param  u8mailboxnum		Mailbox to be updated
+ *
+ * return SUCCESS or FAILURE
+ */
+s16 pru_can_get_data_from_mailbox(struct device *dev,
+		can_emu_app_hndl *pstremuapphndl)
+{
+	s16 s16subrtnretval;
+	u32 u32offset;
+
+	if (pstremuapphndl == NULL) {
+		return -1;
+	}
+
+	switch ((u8) pstremuapphndl->ecanmailboxnumber) {
+	case 0:
+		u32offset = (PRU_CAN_RX_MAILBOX0);
+		break;
+	case 1:
+		u32offset = (PRU_CAN_RX_MAILBOX1);
+		break;
+	case 2:
+		u32offset = (PRU_CAN_RX_MAILBOX2);
+		break;
+	case 3:
+		u32offset = (PRU_CAN_RX_MAILBOX3);
+		break;
+	case 4:
+		u32offset = (PRU_CAN_RX_MAILBOX4);
+		break;
+	case 5:
+		u32offset = (PRU_CAN_RX_MAILBOX5);
+		break;
+	case 6:
+		u32offset = (PRU_CAN_RX_MAILBOX6);
+		break;
+	case 7:
+		u32offset = (PRU_CAN_RX_MAILBOX7);
+		break;
+	case 8:
+		u32offset = (PRU_CAN_RX_MAILBOX8);
+		break;
+	default:
+		return -1;
+	}
+
+	s16subrtnretval =
+	    pruss_readl(dev, u32offset,
+		  (u32 *) &(pstremuapphndl->strcanmailbox),
+				  4);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+	return 0;
+}
+
+/*
+ * pru_can_receive_id_map()
+ * Receive mailboxes ID Mapping of PRU0  of OMAP L138.
+ * This API will be called by the Application
+ * to map the IDs  to receive mailboxes of PRU0
+ *
+ * param  u32nodeid		Can node ID
+ *
+ * param  ecanmailboxno		Mailbox to be mapped
+ *
+ * return   SUCCESS or FAILURE
+ */
+s16 pru_can_rx_id_map(struct device *dev, u32 u32nodeid,
+		can_mailbox_number ecanmailboxno)
+{
+
+	pruss_writel(dev, (PRU_CAN_ID_MAP +
+		(((u8) ecanmailboxno) * 4)), (u32 *) &u32nodeid, 1);
+
+	return 0;
+}
+
+/*
+ * pru_can_get_intr_status()
+ * Gets the interrupts status register value.
+ * This API will be called by the Application
+ * to get the interrupts status register value
+ *
+ * param  u8prunumber	PRU number for which IntStatusReg
+ * has to be read
+ *
+ * return   SUCCESS or FAILURE
+ */
+s16 pru_can_get_intr_status(struct device *dev,
+		can_emu_app_hndl *pstremuapphndl)
+{
+	u32 u32offset;
+	s16 s16subrtnretval = -1;
+
+	if (pstremuapphndl == NULL) {
+		return -1;
+	}
+
+	if (pstremuapphndl->u8prunumber == DA8XX_PRUCORE_1) {
+		u32offset = (PRU_CAN_TX_INTERRUPT_STATUS_REGISTER);
+	} else if (pstremuapphndl->u8prunumber == DA8XX_PRUCORE_0) {
+		u32offset = (PRU_CAN_RX_INTERRUPT_STATUS_REGISTER);
+	} else {
+		return -1;
+	}
+
+	s16subrtnretval = pruss_readl(dev, u32offset,
+		(u32 *) &pstremuapphndl->u32interruptstatus, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	return 0;
+}
+
+/*
+ * pru_can_get_global_status()	Gets the globalstatus
+ * register value. This API will be called by the Application
+ * to  get the global status register value
+ *
+ * return   SUCCESS or FAILURE
+ */
+s16 pru_can_get_global_status(struct device *dev,
+		can_emu_app_hndl *pstremuapphndl)
+{
+	u32 u32offset;
+	int s16subrtnretval = -1;
+
+	if (pstremuapphndl == NULL) {
+		return -1;
+	}
+
+	if (pstremuapphndl->u8prunumber == DA8XX_PRUCORE_1) {
+		u32offset = (PRU_CAN_TX_GLOBAL_STATUS_REGISTER);
+	} else if (pstremuapphndl->u8prunumber == DA8XX_PRUCORE_0) {
+		u32offset = (PRU_CAN_RX_GLOBAL_STATUS_REGISTER);
+	} else {
+		return -1;
+	}
+
+	s16subrtnretval = pruss_readl(dev, u32offset,
+		(u32 *) &pstremuapphndl->u32globalstatus, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	return 0;
+}
+
+/*
+ * pru_can_get_mailbox_status()		Gets the mailbox status
+ * register value. This API will be called by the Application
+ * to get the mailbox status register value
+ *
+ * return   SUCCESS or FAILURE
+ */
+s16 pru_can_get_mailbox_status(struct device *dev,
+		can_emu_app_hndl *pstremuapphndl)
+{
+	u32 u32offset;
+	s16 s16subrtnretval = -1;
+
+	if (pstremuapphndl == NULL) {
+		return -1;
+	}
+
+	if (pstremuapphndl->u8prunumber == DA8XX_PRUCORE_1) {
+		switch (pstremuapphndl->ecanmailboxnumber) {
+		case 0:
+			u32offset = (PRU_CAN_TX_MAILBOX0_STATUS_REGISTER);
+			break;
+		case 1:
+			u32offset = (PRU_CAN_TX_MAILBOX1_STATUS_REGISTER);
+			break;
+		case 2:
+			u32offset = (PRU_CAN_TX_MAILBOX2_STATUS_REGISTER);
+			break;
+		case 3:
+			u32offset = (PRU_CAN_TX_MAILBOX3_STATUS_REGISTER);
+			break;
+		case 4:
+			u32offset = (PRU_CAN_TX_MAILBOX4_STATUS_REGISTER);
+			break;
+		case 5:
+			u32offset = (PRU_CAN_TX_MAILBOX5_STATUS_REGISTER);
+			break;
+		case 6:
+			u32offset = (PRU_CAN_TX_MAILBOX6_STATUS_REGISTER);
+			break;
+		case 7:
+			u32offset = (PRU_CAN_TX_MAILBOX7_STATUS_REGISTER);
+			break;
+		default:
+			return -1;
+		}
+	}
+
+	else if (pstremuapphndl->u8prunumber == DA8XX_PRUCORE_0) {
+		switch (pstremuapphndl->ecanmailboxnumber) {
+		case 0:
+			u32offset = (PRU_CAN_RX_MAILBOX0_STATUS_REGISTER);
+			break;
+		case 1:
+			u32offset = (PRU_CAN_RX_MAILBOX1_STATUS_REGISTER);
+			break;
+		case 2:
+			u32offset = (PRU_CAN_RX_MAILBOX2_STATUS_REGISTER);
+			break;
+		case 3:
+			u32offset = (PRU_CAN_RX_MAILBOX3_STATUS_REGISTER);
+			break;
+		case 4:
+			u32offset = (PRU_CAN_RX_MAILBOX4_STATUS_REGISTER);
+			break;
+		case 5:
+			u32offset = (PRU_CAN_RX_MAILBOX5_STATUS_REGISTER);
+			break;
+		case 6:
+			u32offset = (PRU_CAN_RX_MAILBOX6_STATUS_REGISTER);
+			break;
+		case 7:
+			u32offset = (PRU_CAN_RX_MAILBOX7_STATUS_REGISTER);
+			break;
+		case 8:
+			u32offset = (PRU_CAN_RX_MAILBOX8_STATUS_REGISTER);
+			break;
+		default:
+			return -1;
+		}
+	}
+
+	else {
+		return -1;
+	}
+
+	s16subrtnretval = pruss_readl(dev, u32offset,
+		(u32 *) &pstremuapphndl->u32mailboxstatus, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	return 0;
+}
+
+s16 pru_can_tx_mode_set(struct device *dev, bool btransfer_flag,
+				can_transfer_direction ecan_trx)
+{
+	u32 u32offset;
+	u32 u32value;
+
+	if (ecan_trx == ecantransmit) {
+		u32offset = (PRU_CAN_RX_GLOBAL_STATUS_REGISTER);
+		pruss_readl(dev, u32offset, &u32value, 1);
+		if (btransfer_flag == true) {
+			u32value &= 0x1F;
+			u32value |= 0x80;
+		} else {
+			u32value &= 0x7F;
+		}
+		pruss_writel(dev, u32offset, &u32value, 1);
+		u32offset = (PRU_CAN_TX_GLOBAL_STATUS_REGISTER);
+		pruss_writel(dev, u32offset, &u32value, 1);
+	} else if (ecan_trx == ecanreceive) {
+		u32offset = (PRU_CAN_RX_GLOBAL_STATUS_REGISTER);
+		pruss_readl(dev, u32offset, &u32value, 1);
+		if (btransfer_flag == true) {
+			u32value &= 0x1F;
+			u32value |= 0x40;
+		} else {
+			u32value &= 0xBF;
+		}
+		pruss_writel(dev, u32offset, &u32value, 1);
+		u32offset = (PRU_CAN_TX_GLOBAL_STATUS_REGISTER);
+		pruss_writel(dev, u32offset, &u32value, 1);
+	} else
+		return -1;
+
+	return 0;
+}
+
+/*
+ * pru_can_config_mode_set()		Sets the timing value
+ * for data transfer. This API will be called by the Application
+ * to set timing valus for data transfer
+ *
+ * return   SUCCESS or FAILURE
+ */
+s16 pru_can_config_mode_set(struct device *dev, bool bconfigmodeflag)
+{
+
+	u32 u32bitrateprescaler;
+	u32 u32canbittiming;
+
+	pruss_readl(dev, (PRU_CAN_TX_CLOCK_BRP_REGISTER),
+			(u32 *) &u32bitrateprescaler, 1);
+	pruss_readl(dev, (PRU_CAN_TX_TIMING_REGISTER),
+			(u32 *) &u32canbittiming, 1);
+
+	if (bconfigmodeflag == 1) {
+		pru_can_calc_timing(dev, u32canbittiming, u32bitrateprescaler);
+	}
+
+	else {
+		pru_can_calc_timing(dev, 0, 0);
+	}
+
+	return 0;
+}
+
+/*
+ * pru_can_emu_init()		Initializes the Can
+ * Emulation Parameters. This API will be called by the Application
+ * to Initialize the Can Emulation Parameters
+ *
+ * param    u32pruclock         PRU Clock value
+ *
+ * return   SUCCESS or FAILURE
+ */
+s16 pru_can_emu_init(struct device *dev, u32 u32pruclock)
+{
+	u32 u32offset;
+	u32 u32value;
+	s16 s16subrtnretval = -1;
+	u8 u8loop;
+
+	for (u8loop = 0; u8loop < (u8) ecanmaxinst; u8loop++) {
+		gstr_can_inst[u8loop].bcaninststate = (bool) 0;
+		gstr_can_inst[u8loop].ecantransferdirection =
+		    (can_transfer_direction) 0;
+		gstr_can_inst[u8loop].u32apphandlerptr = 0;
+	}
+
+	u32offset = (PRU_CAN_TX_GLOBAL_CONTROL_REGISTER & 0xFFFF);
+	u32value = 0x00000000;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_TX_GLOBAL_STATUS_REGISTER & 0xFFFF);
+	u32value = 0x00000040;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+	u32offset = (PRU_CAN_RX_GLOBAL_STATUS_REGISTER & 0xFFFF);
+	u32value = 0x00000040;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_TX_INTERRUPT_MASK_REGISTER & 0xFFFF);
+	u32value = 0x00004000;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_TX_INTERRUPT_STATUS_REGISTER & 0xFFFF);
+	u32value = 0x00000000;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_TX_MAILBOX0_STATUS_REGISTER & 0xFFFF);
+	u32value = 0x00000001;
+	s16subrtnretval =
+	    pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_TX_MAILBOX1_STATUS_REGISTER & 0xFFFF);
+	u32value = 0x00000001;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_TX_MAILBOX2_STATUS_REGISTER & 0xFFFF);
+	u32value = 0x00000001;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_TX_MAILBOX3_STATUS_REGISTER & 0xFFFF);
+	u32value = 0x00000001;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_TX_MAILBOX4_STATUS_REGISTER & 0xFFFF);
+	u32value = 0x00000001;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_TX_MAILBOX5_STATUS_REGISTER & 0xFFFF);
+	u32value = 0x00000001;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_TX_MAILBOX6_STATUS_REGISTER & 0xFFFF);
+	u32value = 0x00000001;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_TX_MAILBOX7_STATUS_REGISTER & 0xFFFF);
+	u32value = 0x00000001;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_TX_ERROR_COUNTER_REGISTER & 0xFFFF);
+	u32value = 0x00000000;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_TX_TIMING_REGISTER & 0xFFFF);
+	u32value = 0x00000000;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_TX_CLOCK_BRP_REGISTER & 0xFFFF);
+	u32value = 0x00000000;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_TX_ERROR_COUNTER_REGISTER & 0xFFFF);
+	u32value = 0x00000000;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRUSS_INTC_POLARITY0 & 0xFFFF);
+	u32value = 0xFFFFFFFF;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+	u32offset = (PRUSS_INTC_POLARITY1 & 0xFFFF);
+	u32value = 0xFFFFFFFF;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+	u32offset = (PRUSS_INTC_TYPE0 & 0xFFFF);
+	u32value = 0x1C000000;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+	u32offset = (PRUSS_INTC_TYPE1 & 0xFFFF);
+	u32value = 0x00000000;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRUSS_INTC_HSTINTENIDXCLR & 0xFFFF);
+	u32value = 0x0;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRUSS_INTC_GLBLEN & 0xFFFF);
+	u32value = 0x1;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+	/* tx intr map arm->pru */
+	u32offset = (PRUSS_INTC_HSTINTENIDXSET & 0xFFFF);
+	u32value = 0x0;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRUSS_INTC_HOSTMAP0 & 0xFFFF);
+	u32value = 0x03020100;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRUSS_INTC_HOSTMAP1 & 0xFFFF);
+	u32value = 0x07060504;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRUSS_INTC_HOSTMAP2 & 0xFFFF);
+	u32value = 0x0000908;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRUSS_INTC_CHANMAP0 & 0xFFFF);
+	u32value = 0;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRUSS_INTC_CHANMAP8 & 0xFFFF);
+	u32value = 0x00020200;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRUSS_INTC_STATIDXCLR & 0xFFFF);
+	u32value = 32;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRUSS_INTC_STATIDXCLR & 0xFFFF);
+	u32value = 19;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRUSS_INTC_ENIDXSET & 0xFFFF);
+	u32value = 19;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+	u32offset = (PRUSS_INTC_STATIDXCLR & 0xFFFF);
+	u32value = 18;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRUSS_INTC_ENIDXSET & 0xFFFF);
+	u32value = 18;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRUSS_INTC_STATIDXCLR & 0xFFFF);
+	u32value = 34;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRUSS_INTC_ENIDXSET & 0xFFFF);
+	u32value = 34;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRUSS_INTC_ENIDXSET & 0xFFFF);
+	u32value = 32;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRUSS_INTC_HOSTINTEN & 0xFFFF);
+	u32value = 0x5;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+/* PRU0 - Rx Internal Registers Initializations */
+
+	u32offset = (PRU_CAN_RX_GLOBAL_CONTROL_REGISTER & 0xFFFF);
+	u32value = 0x00000000;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_RX_GLOBAL_STATUS_REGISTER & 0xFFFF);
+	u32value = 0x00000040;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_RX_INTERRUPT_MASK_REGISTER & 0xFFFF);
+	u32value = 0x00004000;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_RX_INTERRUPT_STATUS_REGISTER & 0xFFFF);
+	u32value = 0x00000000;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_RX_MAILBOX0_STATUS_REGISTER & 0xFFFF);
+	u32value = 0x00000000;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_RX_MAILBOX1_STATUS_REGISTER & 0xFFFF);
+	u32value = 0x0000000;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_RX_MAILBOX2_STATUS_REGISTER & 0xFFFF);
+	u32value = 0x00000000;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_RX_MAILBOX3_STATUS_REGISTER & 0xFFFF);
+	u32value = 0x00000000;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_RX_MAILBOX4_STATUS_REGISTER & 0xFFFF);
+	u32value = 0x00000000;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_RX_MAILBOX5_STATUS_REGISTER & 0xFFFF);
+	u32value = 0x00000000;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_RX_MAILBOX6_STATUS_REGISTER & 0xFFFF);
+	u32value = 0x00000000;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_RX_MAILBOX7_STATUS_REGISTER & 0xFFFF);
+	u32value = 0x00000000;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_RX_ERROR_COUNTER_REGISTER & 0xFFFF);
+	u32value = 0x00000000;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_RX_TIMING_REGISTER & 0xFFFF);
+	u32value = 0x0000000;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+
+	u32offset = (PRU_CAN_RX_CLOCK_BRP_REGISTER & 0xFFFF);
+	u32value = 0x00000000;
+	s16subrtnretval = pruss_writel(dev, u32offset, (u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+	return 0;
+}
+
+
+/*
+ * pru_can_emu_open()		Opens the can emu for
+ * application to use. This API will be called by the Application
+ * to Open the can emu for application to use.
+ *
+ * param	pstremuapphndl	Pointer to application handler
+ * structure
+ *
+ * return   SUCCESS or FAILURE
+ */
+s16 pru_can_emu_open(struct device *dev, can_emu_app_hndl *pstremuapphndl)
+{
+
+	if (pstremuapphndl == NULL) {
+		return -1;
+	}
+
+	if (gstr_can_inst[pstremuapphndl->ecaninstance].bcaninststate == 1) {
+		return -1;
+	}
+
+	gstr_can_inst[(u8) pstremuapphndl->ecaninstance].
+					bcaninststate = (bool)1;
+	gstr_can_inst[(u8) pstremuapphndl->
+		ecaninstance].ecantransferdirection =
+		(can_transfer_direction)(u8)pstremuapphndl->ecantransferdirection;
+	gstr_can_inst[(u8) pstremuapphndl->ecaninstance].
+		u32apphandlerptr = (u32) pstremuapphndl;
+
+	return 0;
+}
+
+
+/*
+ * brief    pru_can_emu_close()	Closes the can emu for other
+ * applications to use. This API will be called by the Application to Close
+ * the can emu for other applications to use
+ *
+ * param	pstremuapphndl	Pointer to application handler structure
+ *
+ * return   SUCCESS or FAILURE
+ */
+s16 pru_can_emu_close(struct device *dev, can_emu_app_hndl *pstremuapphndl)
+{
+
+	if (pstremuapphndl == NULL) {
+		return -1;
+	}
+	if (gstr_can_inst[pstremuapphndl->ecaninstance].bcaninststate == 0) {
+		return -1;
+	}
+	if ((u32) pstremuapphndl != gstr_can_inst[(u8) pstremuapphndl->
+			ecaninstance].u32apphandlerptr){
+		return -1;
+	}
+	gstr_can_inst[(u8) pstremuapphndl->ecaninstance].bcaninststate
+		= (bool) 0;
+	gstr_can_inst[(u8) pstremuapphndl->
+	ecaninstance].ecantransferdirection = (can_transfer_direction) 0;
+	gstr_can_inst[(u8) pstremuapphndl->ecaninstance].u32apphandlerptr = 0;
+
+	return 0;
+}
+
+/*
+ * brief    pru_can_emu_exit()	Diables all the PRUs
+ * This API will be called by the Application to disable all PRUs
+ * param	None
+ * return   SUCCESS or FAILURE
+ */
+s16 pru_can_emu_exit(struct device *dev)
+{
+	s16 s16subrtnretval;
+
+	s16subrtnretval = pruss_disable(dev, CAN_RX_PRU_0);
+	if (s16subrtnretval == -1)
+		return -1;
+	s16subrtnretval = pruss_disable(dev, CAN_TX_PRU_1);
+	if (s16subrtnretval == -1)
+		return -1;
+
+	return 0;
+}
+
+s16 pru_can_emu_sreset(struct device *dev)
+{
+	return 0;
+}
+
+s16 pru_can_tx(struct device *dev, u8 u8mailboxnumber, u8 u8prunumber)
+{
+	u32 u32offset = 0;
+	u32 u32value = 0;
+	s16 s16subrtnretval = -1;
+
+	if (DA8XX_PRUCORE_1 == u8prunumber) {
+		switch (u8mailboxnumber) {
+		case 0:
+			u32offset = (PRU_CAN_TX_MAILBOX0_STATUS_REGISTER & 0xFFFF);
+			u32value = 0x00000080;
+			s16subrtnretval = pruss_writel(dev, u32offset,
+					(u32 *) &u32value, 1);
+			if (s16subrtnretval == -1) {
+				return -1;
+			}
+			break;
+		case 1:
+			u32offset = (PRU_CAN_TX_MAILBOX1_STATUS_REGISTER & 0xFFFF);
+			u32value = 0x00000080;
+			s16subrtnretval = pruss_writel(dev, u32offset,
+						(u32 *) &u32value, 1);
+			if (s16subrtnretval == -1) {
+				return -1;
+			}
+			break;
+		case 2:
+			u32offset = (PRU_CAN_TX_MAILBOX2_STATUS_REGISTER & 0xFFFF);
+			u32value = 0x00000080;
+			s16subrtnretval = pruss_writel(dev, u32offset,
+						(u32 *) &u32value, 1);
+			if (s16subrtnretval == -1) {
+				return -1;
+			}
+			break;
+		case 3:
+			u32offset = (PRU_CAN_TX_MAILBOX3_STATUS_REGISTER & 0xFFFF);
+			u32value = 0x00000080;
+			s16subrtnretval = pruss_writel(dev, u32offset,
+						(u32 *) &u32value, 1);
+			if (s16subrtnretval == -1) {
+				return -1;
+			}
+			break;
+		case 4:
+			u32offset = (PRU_CAN_TX_MAILBOX4_STATUS_REGISTER & 0xFFFF);
+			u32value = 0x00000080;
+			s16subrtnretval = pruss_writel(dev, u32offset,
+						(u32 *) &u32value, 1);
+			if (s16subrtnretval == -1) {
+				return -1;
+			}
+			break;
+		case 5:
+			u32offset = (PRU_CAN_TX_MAILBOX5_STATUS_REGISTER & 0xFFFF);
+			u32value = 0x00000080;
+			s16subrtnretval = pruss_writel(dev, u32offset,
+						(u32 *) &u32value, 1);
+			if (s16subrtnretval == -1) {
+				return -1;
+			}
+			break;
+		case 6:
+			u32offset = (PRU_CAN_TX_MAILBOX6_STATUS_REGISTER & 0xFFFF);
+			u32value = 0x00000080;
+			s16subrtnretval = pruss_writel(dev, u32offset,
+						(u32 *) &u32value, 1);
+			if (s16subrtnretval == -1) {
+				return -1;
+			}
+			break;
+		case 7:
+			u32offset = (PRU_CAN_TX_MAILBOX7_STATUS_REGISTER & 0xFFFF);
+			u32value = 0x00000080;
+			s16subrtnretval = pruss_writel(dev, u32offset,
+						(u32 *) &u32value, 1);
+			if (s16subrtnretval == -1) {
+				return -1;
+			}
+			break;
+		default:
+			return -1;
+		}
+	} else {
+
+		u32offset = (PRU_CAN_RX_INTERRUPT_STATUS_REGISTER & 0xFFFF);
+		u32value = 0x00000000;
+		s16subrtnretval = pruss_readl(dev, u32offset,
+						(u32 *) &u32value, 1);
+		if (s16subrtnretval == -1) {
+			return -1;
+		}
+		u32value = u32value & ~(1 << u8mailboxnumber);
+		s16subrtnretval = pruss_writel(dev, u32offset,
+					(u32 *) &u32value, 1);
+		if (s16subrtnretval == -1) {
+			return -1;
+		}
+
+		switch (u8mailboxnumber) {
+		case 0:
+			u32offset = (PRU_CAN_RX_MAILBOX0_STATUS_REGISTER & 0xFFFF);
+			u32value = 0x00000000;
+			s16subrtnretval = pruss_writel(dev, u32offset,
+						(u32 *) &u32value, 1);
+			if (s16subrtnretval == -1) {
+				return -1;
+			}
+			break;
+		case 1:
+			u32offset = (PRU_CAN_RX_MAILBOX1_STATUS_REGISTER & 0xFFFF);
+			u32value = 0x00000000;
+			s16subrtnretval = pruss_writel(dev, u32offset,
+						(u32 *) &u32value, 1);
+			if (s16subrtnretval == -1) {
+				return -1;
+			}
+			break;
+		case 2:
+			u32offset = (PRU_CAN_RX_MAILBOX2_STATUS_REGISTER & 0xFFFF);
+			u32value = 0x00000000;
+			s16subrtnretval = pruss_writel(dev, u32offset,
+						(u32 *) &u32value, 1);
+			if (s16subrtnretval == -1) {
+				return -1;
+			}
+			break;
+		case 3:
+			u32offset = (PRU_CAN_RX_MAILBOX3_STATUS_REGISTER & 0xFFFF);
+			u32value = 0x00000000;
+			s16subrtnretval = pruss_writel(dev, u32offset,
+						(u32 *) &u32value, 1);
+			if (s16subrtnretval == -1) {
+				return -1;
+			}
+			break;
+		case 4:
+			u32offset = (PRU_CAN_RX_MAILBOX4_STATUS_REGISTER & 0xFFFF);
+			u32value = 0x00000000;
+			s16subrtnretval = pruss_writel(dev, u32offset,
+						(u32 *) &u32value, 1);
+			if (s16subrtnretval == -1) {
+				return -1;
+			}
+			break;
+		case 5:
+			u32offset = (PRU_CAN_RX_MAILBOX5_STATUS_REGISTER & 0xFFFF);
+			u32value = 0x00000000;
+			s16subrtnretval = pruss_writel(dev, u32offset,
+						(u32 *) &u32value, 1);
+			if (s16subrtnretval == -1) {
+				return -1;
+			}
+			break;
+		case 6:
+			u32offset = (PRU_CAN_RX_MAILBOX6_STATUS_REGISTER & 0xFFFF);
+			u32value = 0x00000000;
+			s16subrtnretval = pruss_writel(dev, u32offset,
+						(u32 *) &u32value, 1);
+			if (s16subrtnretval == -1) {
+				return -1;
+			}
+			break;
+		case 7:
+			u32offset = (PRU_CAN_RX_MAILBOX7_STATUS_REGISTER & 0xFFFF);
+			u32value = 0x00000000;
+			s16subrtnretval = pruss_writel(dev, u32offset,
+						(u32 *) &u32value, 1);
+			if (s16subrtnretval == -1) {
+				return -1;
+			}
+			break;
+		default:
+			return -1;
+		}
+	}
+	return 0;
+}
+
+s16 pru_can_start_abort_tx(struct device *dev, bool bcantransmitabortflag)
+{
+	u32 u32offset;
+	u32 u32value;
+	s16 s16subrtnretval;
+	u32offset = (PRUSS_INTC_STATIDXCLR & 0xFFFF);
+	u32value = 32;
+	s16subrtnretval = pruss_writel(dev, u32offset,
+					(u32 *) &u32value, 1);
+
+	u32offset = (PRUSS_INTC_ENIDXSET & 0xFFFF);
+	u32value = 32;
+	s16subrtnretval = pruss_writel(dev, u32offset,
+					(u32 *) &u32value, 1);
+
+	u32offset = (PRUSS_INTC_STATIDXSET & 0xFFFF);
+	u32value = 32;
+	s16subrtnretval = pruss_writel(dev, u32offset,
+					(u32 *) &u32value, 1);
+	if (s16subrtnretval == -1) {
+		return -1;
+	}
+	return 0;
+}
+
+s16 pru_can_mask_ints(struct device *dev, u32 int_mask)
+{
+	return 0;
+}
+
+int pru_can_get_error_cnt(struct device *dev, u8 u8prunumber)
+{
+	return 0;
+}
+
+int pru_can_get_intc_status(struct device *dev)
+{
+	u32 u32offset = 0;
+	u32 u32getvalue = 0;
+	u32 u32clrvalue = 0;
+
+	u32offset = (PRUSS_INTC_STATCLRINT1 & 0xFFFF);
+	pruss_readl(dev, u32offset, (u32 *) &u32getvalue, 1);
+
+	if (u32getvalue & 4)
+		u32clrvalue = 34;	/* CLR Event 34 */
+
+	if (u32getvalue & 2)
+		u32clrvalue = 33;	/* CLR Event 33  */
+
+	if (u32clrvalue) {
+		u32offset = (PRUSS_INTC_STATIDXCLR & 0xFFFF);
+		pruss_writel(dev, u32offset, &u32clrvalue, 1);
+	} else
+		return -1;
+
+	return u32getvalue;
+}