[PATCH v1 4/9] can: pruss CAN driver.
Subhasish Ghosh
subhasish at mistralsolutions.com
Tue Feb 1 09:47:42 EST 2011
This patch adds support for the CAN device emulated on PRUSS.
Signed-off-by: Subhasish Ghosh <subhasish at mistralsolutions.com>
---
drivers/net/can/Kconfig | 1 +
drivers/net/can/Makefile | 1 +
drivers/net/can/da8xx_pruss/Kconfig | 73 ++
drivers/net/can/da8xx_pruss/Makefile | 7 +
drivers/net/can/da8xx_pruss/pruss_can.c | 759 +++++++++++++++++
drivers/net/can/da8xx_pruss/pruss_can_api.c | 1224 +++++++++++++++++++++++++++
drivers/net/can/da8xx_pruss/pruss_can_api.h | 290 +++++++
7 files changed, 2355 insertions(+), 0 deletions(-)
create mode 100644 drivers/net/can/da8xx_pruss/Kconfig
create mode 100644 drivers/net/can/da8xx_pruss/Makefile
create mode 100644 drivers/net/can/da8xx_pruss/pruss_can.c
create mode 100644 drivers/net/can/da8xx_pruss/pruss_can_api.c
create mode 100644 drivers/net/can/da8xx_pruss/pruss_can_api.h
diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig
index d5a9db6..ae8f0f9 100644
--- a/drivers/net/can/Kconfig
+++ b/drivers/net/can/Kconfig
@@ -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"
diff --git a/drivers/net/can/Makefile b/drivers/net/can/Makefile
index 07ca159..849cdbf 100644
--- a/drivers/net/can/Makefile
+++ b/drivers/net/can/Makefile
@@ -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
diff --git a/drivers/net/can/da8xx_pruss/Kconfig b/drivers/net/can/da8xx_pruss/Kconfig
new file mode 100644
index 0000000..8b68f68
--- /dev/null
+++ b/drivers/net/can/da8xx_pruss/Kconfig
@@ -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.
diff --git a/drivers/net/can/da8xx_pruss/Makefile b/drivers/net/can/da8xx_pruss/Makefile
new file mode 100644
index 0000000..48f3055
--- /dev/null
+++ b/drivers/net/can/da8xx_pruss/Makefile
@@ -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
diff --git a/drivers/net/can/da8xx_pruss/pruss_can.c b/drivers/net/can/da8xx_pruss/pruss_can.c
new file mode 100644
index 0000000..44f60fa
--- /dev/null
+++ b/drivers/net/can/da8xx_pruss/pruss_can.c
@@ -0,0 +1,759 @@
+/*
+ * TI DA8XX PRU CAN Emulation device driver
+ * Author: subhasish at 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; /* mail box numbering starts from 0 */
+ 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 at mistralsolutions.com>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("omapl pru CAN netdevice driver");
diff --git a/drivers/net/can/da8xx_pruss/pruss_can_api.c b/drivers/net/can/da8xx_pruss/pruss_can_api.c
new file mode 100644
index 0000000..e48c877
--- /dev/null
+++ b/drivers/net/can/da8xx_pruss/pruss_can_api.c
@@ -0,0 +1,1224 @@
+/*
+ * 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 updtae 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;
+}
diff --git a/drivers/net/can/da8xx_pruss/pruss_can_api.h b/drivers/net/can/da8xx_pruss/pruss_can_api.h
new file mode 100644
index 0000000..f5f704b
--- /dev/null
+++ b/drivers/net/can/da8xx_pruss/pruss_can_api.h
@@ -0,0 +1,290 @@
+/*
+ * Copyright (C) 2010 Texas Instruments Incorporated
+ * Author: Ganeshan N
+ *
+ * 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.
+ */
+
+#ifndef _PRU_CAN_API_H_
+#define _PRU_CAN_API_H_
+
+#include <linux/types.h>
+#include <linux/mfd/pruss/da8xx_pru.h>
+
+
+#define CAN_BIT_TIMINGS (0x273)
+
+/* Timer Clock is sourced from DDR freq (PLL1 SYS CLK 2) */
+#define TIMER_CLK_FREQ 132000000
+
+#define TIMER_SETUP_DELAY 14
+#define GPIO_SETUP_DELAY 150
+
+#define CAN_RX_PRU_0 PRUSS_NUM0
+#define CAN_TX_PRU_1 PRUSS_NUM1
+
+/* Number of Instruction in the Delay loop */
+#define DELAY_LOOP_LENGTH 2
+
+#define PRU1_BASE_ADDR 0x2000
+
+#define PRU_CAN_TX_GLOBAL_CONTROL_REGISTER (PRU1_BASE_ADDR)
+#define PRU_CAN_TX_GLOBAL_STATUS_REGISTER (PRU1_BASE_ADDR + 0x04)
+#define PRU_CAN_TX_INTERRUPT_MASK_REGISTER (PRU1_BASE_ADDR + 0x08)
+#define PRU_CAN_TX_INTERRUPT_STATUS_REGISTER (PRU1_BASE_ADDR + 0x0C)
+#define PRU_CAN_TX_MAILBOX0_STATUS_REGISTER (PRU1_BASE_ADDR + 0x10)
+#define PRU_CAN_TX_MAILBOX1_STATUS_REGISTER (PRU1_BASE_ADDR + 0x14)
+#define PRU_CAN_TX_MAILBOX2_STATUS_REGISTER (PRU1_BASE_ADDR + 0x18)
+#define PRU_CAN_TX_MAILBOX3_STATUS_REGISTER (PRU1_BASE_ADDR + 0x1C)
+#define PRU_CAN_TX_MAILBOX4_STATUS_REGISTER (PRU1_BASE_ADDR + 0x20)
+#define PRU_CAN_TX_MAILBOX5_STATUS_REGISTER (PRU1_BASE_ADDR + 0x24)
+#define PRU_CAN_TX_MAILBOX6_STATUS_REGISTER (PRU1_BASE_ADDR + 0x28)
+#define PRU_CAN_TX_MAILBOX7_STATUS_REGISTER (PRU1_BASE_ADDR + 0x2C)
+#define PRU_CAN_TX_ERROR_COUNTER_REGISTER (PRU1_BASE_ADDR + 0x30)
+#define PRU_CAN_TX_TIMING_REGISTER (PRU1_BASE_ADDR + 0x34)
+#define PRU_CAN_TX_CLOCK_BRP_REGISTER (PRU1_BASE_ADDR + 0x38)
+
+#define PRU_CAN_TX_MAILBOX0 (PRU1_BASE_ADDR + 0x40)
+#define PRU_CAN_TX_MAILBOX1 (PRU1_BASE_ADDR + 0x50)
+#define PRU_CAN_TX_MAILBOX2 (PRU1_BASE_ADDR + 0x60)
+#define PRU_CAN_TX_MAILBOX3 (PRU1_BASE_ADDR + 0x70)
+#define PRU_CAN_TX_MAILBOX4 (PRU1_BASE_ADDR + 0x80)
+#define PRU_CAN_TX_MAILBOX5 (PRU1_BASE_ADDR + 0x90)
+#define PRU_CAN_TX_MAILBOX6 (PRU1_BASE_ADDR + 0xA0)
+#define PRU_CAN_TX_MAILBOX7 (PRU1_BASE_ADDR + 0xB0)
+
+#define PRU_CAN_TIMING_VAL_TX (PRU1_BASE_ADDR + 0xC0)
+#define PRU_CAN_TIMING_VAL_TX_SJW (PRU1_BASE_ADDR + 0xC4)
+#define PRU_CAN_TRANSMIT_FRAME (PRU1_BASE_ADDR + 0xE0)
+
+#define PRU0_BASE_ADDR 0
+
+#define PRU_CAN_RX_GLOBAL_CONTROL_REGISTER (PRU0_BASE_ADDR)
+#define PRU_CAN_RX_GLOBAL_STATUS_REGISTER (PRU0_BASE_ADDR + 0x04)
+#define PRU_CAN_RX_INTERRUPT_MASK_REGISTER (PRU0_BASE_ADDR + 0x08)
+#define PRU_CAN_RX_INTERRUPT_STATUS_REGISTER (PRU0_BASE_ADDR + 0x0C)
+#define PRU_CAN_RX_MAILBOX0_STATUS_REGISTER (PRU0_BASE_ADDR + 0x10)
+#define PRU_CAN_RX_MAILBOX1_STATUS_REGISTER (PRU0_BASE_ADDR + 0x14)
+#define PRU_CAN_RX_MAILBOX2_STATUS_REGISTER (PRU0_BASE_ADDR + 0x18)
+#define PRU_CAN_RX_MAILBOX3_STATUS_REGISTER (PRU0_BASE_ADDR + 0x1C)
+#define PRU_CAN_RX_MAILBOX4_STATUS_REGISTER (PRU0_BASE_ADDR + 0x20)
+#define PRU_CAN_RX_MAILBOX5_STATUS_REGISTER (PRU0_BASE_ADDR + 0x24)
+#define PRU_CAN_RX_MAILBOX6_STATUS_REGISTER (PRU0_BASE_ADDR + 0x28)
+#define PRU_CAN_RX_MAILBOX7_STATUS_REGISTER (PRU0_BASE_ADDR + 0x2C)
+#define PRU_CAN_RX_MAILBOX8_STATUS_REGISTER (PRU0_BASE_ADDR + 0x30)
+#define PRU_CAN_RX_ERROR_COUNTER_REGISTER (PRU0_BASE_ADDR + 0x34)
+#define PRU_CAN_RX_TIMING_REGISTER (PRU0_BASE_ADDR + 0x38)
+#define PRU_CAN_RX_CLOCK_BRP_REGISTER (PRU0_BASE_ADDR + 0x3C)
+
+#define PRU_CAN_RX_MAILBOX0 (PRU0_BASE_ADDR + 0x40)
+#define PRU_CAN_RX_MAILBOX1 (PRU0_BASE_ADDR + 0x50)
+#define PRU_CAN_RX_MAILBOX2 (PRU0_BASE_ADDR + 0x60)
+#define PRU_CAN_RX_MAILBOX3 (PRU0_BASE_ADDR + 0x70)
+#define PRU_CAN_RX_MAILBOX4 (PRU0_BASE_ADDR + 0x80)
+#define PRU_CAN_RX_MAILBOX5 (PRU0_BASE_ADDR + 0x90)
+#define PRU_CAN_RX_MAILBOX6 (PRU0_BASE_ADDR + 0xA0)
+#define PRU_CAN_RX_MAILBOX7 (PRU0_BASE_ADDR + 0xB0)
+#define PRU_CAN_RX_MAILBOX8 (PRU0_BASE_ADDR + 0xC0)
+
+#define PRU_CAN_TIMING_VAL_RX (PRU0_BASE_ADDR + 0xD0)
+#define PRU_CAN_RECEIVE_FRAME (PRU0_BASE_ADDR + 0xD4)
+#define PRU_CAN_ID_MAP (PRU0_BASE_ADDR + 0xF0)
+
+#define PRU_CAN_ERROR_ACTIVE 128
+
+#define CAN_ACK_FAILED 0xE
+#define CAN_ARBTR_FAIL 0xD
+#define CAN_BIT_ERROR 0xC
+#define CAN_TRANSMISSION_SUCCESS 0xA
+
+#define STD_DATA_FRAME 0x1
+#define EXTD_DATA_FRAME 0x2
+#define STD_REMOTE_FRAME 0x3
+#define EXTD_REMOTE_FRAME 0x4
+
+#define PRU_CAN_MAX_SJW 8
+#define PRU_CAN_MAX_PHSEG1 25
+#define PRU_CAN_MAX_PHSEG2 25
+
+#define DA8XX_PRUCANCORE_0_REGS 0x7000
+#define DA8XX_PRUCANCORE_1_REGS 0x7800
+#define PRU0_PROG_RAM_START_OFFSET 0x8000
+#define PRU1_PROG_RAM_START_OFFSET 0xC000
+#define PRU_CAN_INIT_MAX_TIMEOUT 0xFF
+
+typedef enum {
+ ecaninst0 = 0,
+ ecaninst1,
+ ecanmaxinst
+} can_instance_enum;
+
+typedef enum {
+ ecanmailbox0 = 0,
+ ecanmailbox1,
+ ecanmailbox2,
+ ecanmailbox3,
+ ecanmailbox4,
+ ecanmailbox5,
+ ecanmailbox6,
+ ecanmailbox7
+} can_mailbox_number;
+
+typedef enum {
+ ecandirectioninit = 0,
+ ecantransmit,
+ ecanreceive
+} can_transfer_direction;
+
+typedef struct {
+ u16 u16extendedidentifier;
+ u16 u16baseidentifier;
+ u8 u8data7;
+ u8 u8data6;
+ u8 u8data5;
+ u8 u8data4;
+ u8 u8data3;
+ u8 u8data2;
+ u8 u8data1;
+ u8 u8data0;
+ u16 u16datalength;
+ u16 u16crc;
+} can_mail_box_structure;
+
+typedef struct {
+ can_transfer_direction ecantransferdirection;
+} can_mailbox_config;
+
+typedef struct {
+ can_instance_enum ecaninstance;
+ can_transfer_direction ecantransferdirection;
+ can_mail_box_structure strcanmailbox;
+ can_mailbox_number ecanmailboxnumber;
+ u8 u8prunumber;
+ u32 u32globalstatus;
+ u32 u32interruptstatus;
+ u32 u32mailboxstatus;
+} can_emu_app_hndl;
+
+typedef struct {
+ bool bcaninststate;
+ can_transfer_direction ecantransferdirection;
+ u32 u32apphandlerptr;
+} can_emu_drv_inst;
+
+typedef struct {
+ u8 u8syncjumpwidth;
+ u8 u8phseg1;
+ u8 u8phseg2;
+} can_bit_timing_consts;
+
+/* Field Definition Macros */
+
+/* CONTROL */
+
+/*
+ * pru_can_set_brp() Updates the BRP register of PRU.
+ */
+s16 pru_can_set_brp(struct device *dev, u16 u16prescaler);
+
+/*
+ * pru_can_set_bit_timing() Updates the timing register of PRU
+ */
+s16 pru_can_set_bit_timing(struct device *dev,
+ can_bit_timing_consts *pstrbittiming);
+
+/*
+ * pru_can_calc_timing() Updates the timing values of PRU
+ */
+s16 pru_can_calc_timing(struct device *dev,
+ u32 u32bittiming, u32 u32bitrateprescaler);
+
+/*
+ * pru_can_write_data_to_mailbox() Updates the transmit mailboxes of PRU1
+ */
+s16 pru_can_write_data_to_mailbox(struct device *dev,
+ can_emu_app_hndl *pstremuapphndl);
+
+/*
+ * pru_can_get_data_from_mailbox() Receive data from receive mailboxes
+ */
+s16 pru_can_get_data_from_mailbox(struct device *dev,
+ can_emu_app_hndl *pstremuapphndl);
+
+/*
+ * pru_can_rx_id_map()Receive mailboxes ID Mapping of PRU0
+ */
+s16 pru_can_rx_id_map(struct device *dev,
+ u32 u32nodeid, can_mailbox_number ecanmailboxno);
+
+/*
+ *pru_can_get_intr_status() Get interrupts status register value
+ */
+s16 pru_can_get_intr_status(struct device *dev,
+ can_emu_app_hndl *pstremuapphndl);
+
+
+/*
+ * pru_can_get_global_status() Get the globalstatus register value
+ */
+s16 pru_can_get_global_status(struct device *dev,
+ can_emu_app_hndl *pstremuapphndl);
+
+/*
+ * pru_can_get_mailbox_status() Get mailbox status reg value
+ */
+s16 pru_can_get_mailbox_status(struct device *dev,
+ can_emu_app_hndl *pstremuapphndl);
+
+/*
+ * pru_can_configuration_mode_set() Sets timing val for data transfer
+ */
+s16 pru_can_config_mode_set(struct device *dev,
+ bool bconfig_modeflag);
+
+/*
+ * pru_can_emu_init() Initializes Can Emulation Parameters
+ */
+s16 pru_can_emu_init(struct device *dev,
+ u32 u32pruclock);
+
+/*
+ * pru_can_emu_open() Opens can emu for application to use
+ */
+s16 pru_can_emu_open(struct device *dev,
+ can_emu_app_hndl *pstremuapphndl);
+
+/*
+ * pru_can_emu_close() Closes can emu for applications to use
+ */
+s16 pru_can_emu_close(struct device *dev,
+ can_emu_app_hndl *pstremuapphndl);
+
+/*
+ * pru_can_emu_exit() Diables all the PRUs
+ */
+s16 pru_can_emu_exit(struct device *dev);
+
+s16 pru_can_tx_mode_set(struct device *dev, bool btransfer_flag,
+ can_transfer_direction ecan_trx);
+
+s16 pru_can_emu_sreset(struct device *dev);
+
+s16 pru_can_tx(struct device *dev,
+ u8 u8mailboxnumber, u8 u8prunumber);
+
+s16 pru_can_start_abort_tx(struct device *dev,
+ bool btxabort_flag);
+
+s16 pru_can_mask_ints(struct device *dev, u32 int_mask);
+
+s32 pru_can_get_error_cnt(struct device *dev, u8 u8prunumber);
+
+s32 pru_can_get_intc_status(struct device *dev);
+#endif
--
1.7.2.3
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