--- /dev/null
+/*
+ * Copyright (C) 1999 - 2010 Intel Corporation.
+ * Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
+ *
+ * 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 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/can.h>
+#include <linux/can/dev.h>
+#include <linux/can/error.h>
+
+#define MAX_MSG_OBJ 32
+#define MSG_OBJ_RX 0 /* The receive message object flag. */
+#define MSG_OBJ_TX 1 /* The transmit message object flag. */
+
+#define ENABLE 1 /* The enable flag */
+#define DISABLE 0 /* The disable flag */
+#define CAN_CTRL_INIT 0x0001 /* The INIT bit of CANCONT register. */
+#define CAN_CTRL_IE 0x0002 /* The IE bit of CAN control register */
+#define CAN_CTRL_IE_SIE_EIE 0x000e
+#define CAN_CTRL_CCE 0x0040
+#define CAN_CTRL_OPT 0x0080 /* The OPT bit of CANCONT register. */
+#define CAN_OPT_SILENT 0x0008 /* The Silent bit of CANOPT reg. */
+#define CAN_OPT_LBACK 0x0010 /* The LoopBack bit of CANOPT reg. */
+#define CAN_CMASK_RX_TX_SET 0x00f3
+#define CAN_CMASK_RX_TX_GET 0x0073
+#define CAN_CMASK_ALL 0xff
+#define CAN_CMASK_RDWR 0x80
+#define CAN_CMASK_ARB 0x20
+#define CAN_CMASK_CTRL 0x10
+#define CAN_CMASK_MASK 0x40
+#define CAN_CMASK_NEWDAT 0x04
+#define CAN_CMASK_CLRINTPND 0x08
+
+#define CAN_IF_MCONT_NEWDAT 0x8000
+#define CAN_IF_MCONT_INTPND 0x2000
+#define CAN_IF_MCONT_UMASK 0x1000
+#define CAN_IF_MCONT_TXIE 0x0800
+#define CAN_IF_MCONT_RXIE 0x0400
+#define CAN_IF_MCONT_RMTEN 0x0200
+#define CAN_IF_MCONT_TXRQXT 0x0100
+#define CAN_IF_MCONT_EOB 0x0080
+#define CAN_IF_MCONT_DLC 0x000f
+#define CAN_IF_MCONT_MSGLOST 0x4000
+#define CAN_MASK2_MDIR_MXTD 0xc000
+#define CAN_ID2_DIR 0x2000
+#define CAN_ID_MSGVAL 0x8000
+
+#define CAN_STATUS_INT 0x8000
+#define CAN_IF_CREQ_BUSY 0x8000
+#define CAN_ID2_XTD 0x4000
+
+#define CAN_REC 0x00007f00
+#define CAN_TEC 0x000000ff
+
+#define PCH_RX_OK 0x00000010
+#define PCH_TX_OK 0x00000008
+#define PCH_BUS_OFF 0x00000080
+#define PCH_EWARN 0x00000040
+#define PCH_EPASSIV 0x00000020
+#define PCH_LEC0 0x00000001
+#define PCH_LEC1 0x00000002
+#define PCH_LEC2 0x00000004
+#define PCH_LEC_ALL (PCH_LEC0 | PCH_LEC1 | PCH_LEC2)
+#define PCH_STUF_ERR PCH_LEC0
+#define PCH_FORM_ERR PCH_LEC1
+#define PCH_ACK_ERR (PCH_LEC0 | PCH_LEC1)
+#define PCH_BIT1_ERR PCH_LEC2
+#define PCH_BIT0_ERR (PCH_LEC0 | PCH_LEC2)
+#define PCH_CRC_ERR (PCH_LEC1 | PCH_LEC2)
+
+/* bit position of certain controller bits. */
+#define BIT_BITT_BRP 0
+#define BIT_BITT_SJW 6
+#define BIT_BITT_TSEG1 8
+#define BIT_BITT_TSEG2 12
+#define BIT_IF1_MCONT_RXIE 10
+#define BIT_IF2_MCONT_TXIE 11
+#define BIT_BRPE_BRPE 6
+#define BIT_ES_TXERRCNT 0
+#define BIT_ES_RXERRCNT 8
+#define MSK_BITT_BRP 0x3f
+#define MSK_BITT_SJW 0xc0
+#define MSK_BITT_TSEG1 0xf00
+#define MSK_BITT_TSEG2 0x7000
+#define MSK_BRPE_BRPE 0x3c0
+#define MSK_BRPE_GET 0x0f
+#define MSK_CTRL_IE_SIE_EIE 0x07
+#define MSK_MCONT_TXIE 0x08
+#define MSK_MCONT_RXIE 0x10
+#define PCH_CAN_NO_TX_BUFF 1
+#define COUNTER_LIMIT 10
+
+#define PCH_CAN_CLK 50000000 /* 50MHz */
+
+/* Define the number of message object.
+ * PCH CAN communications are done via Message RAM.
+ * The Message RAM consists of 32 message objects. */
+#define PCH_RX_OBJ_NUM 26 /* 1~ PCH_RX_OBJ_NUM is Rx*/
+#define PCH_TX_OBJ_NUM 6 /* PCH_RX_OBJ_NUM is RX ~ Tx*/
+#define PCH_OBJ_NUM (PCH_TX_OBJ_NUM + PCH_RX_OBJ_NUM)
+
+#define PCH_FIFO_THRESH 16
+
+enum pch_can_mode {
+ PCH_CAN_ENABLE,
+ PCH_CAN_DISABLE,
+ PCH_CAN_ALL,
+ PCH_CAN_NONE,
+ PCH_CAN_STOP,
+ PCH_CAN_RUN
+};
+
+struct pch_can_regs {
+ u32 cont;
+ u32 stat;
+ u32 errc;
+ u32 bitt;
+ u32 intr;
+ u32 opt;
+ u32 brpe;
+ u32 reserve1;
+ u32 if1_creq;
+ u32 if1_cmask;
+ u32 if1_mask1;
+ u32 if1_mask2;
+ u32 if1_id1;
+ u32 if1_id2;
+ u32 if1_mcont;
+ u32 if1_dataa1;
+ u32 if1_dataa2;
+ u32 if1_datab1;
+ u32 if1_datab2;
+ u32 reserve2;
+ u32 reserve3[12];
+ u32 if2_creq;
+ u32 if2_cmask;
+ u32 if2_mask1;
+ u32 if2_mask2;
+ u32 if2_id1;
+ u32 if2_id2;
+ u32 if2_mcont;
+ u32 if2_dataa1;
+ u32 if2_dataa2;
+ u32 if2_datab1;
+ u32 if2_datab2;
+ u32 reserve4;
+ u32 reserve5[20];
+ u32 treq1;
+ u32 treq2;
+ u32 reserve6[2];
+ u32 reserve7[56];
+ u32 reserve8[3];
+ u32 srst;
+};
+
+struct pch_can_priv {
+ struct can_priv can;
+ unsigned int can_num;
+ struct pci_dev *dev;
+ unsigned int tx_enable[MAX_MSG_OBJ];
+ unsigned int rx_enable[MAX_MSG_OBJ];
+ unsigned int rx_link[MAX_MSG_OBJ];
+ unsigned int int_enables;
+ unsigned int int_stat;
+ struct net_device *ndev;
+ spinlock_t msgif_reg_lock; /* Message Interface Registers Access Lock*/
+ unsigned int msg_obj[MAX_MSG_OBJ];
+ struct pch_can_regs __iomem *regs;
+ struct napi_struct napi;
+ unsigned int tx_obj; /* Point next Tx Obj index */
+ unsigned int use_msi;
+};
+
+static struct can_bittiming_const pch_can_bittiming_const = {
+ .name = KBUILD_MODNAME,
+ .tseg1_min = 1,
+ .tseg1_max = 16,
+ .tseg2_min = 1,
+ .tseg2_max = 8,
+ .sjw_max = 4,
+ .brp_min = 1,
+ .brp_max = 1024, /* 6bit + extended 4bit */
+ .brp_inc = 1,
+};
+
+static DEFINE_PCI_DEVICE_TABLE(pch_pci_tbl) = {
+ {PCI_VENDOR_ID_INTEL, 0x8818, PCI_ANY_ID, PCI_ANY_ID,},
+ {0,}
+};
+MODULE_DEVICE_TABLE(pci, pch_pci_tbl);
+
+static inline void pch_can_bit_set(u32 *addr, u32 mask)
+{
+ iowrite32(ioread32(addr) | mask, addr);
+}
+
+static inline void pch_can_bit_clear(u32 *addr, u32 mask)
+{
+ iowrite32(ioread32(addr) & ~mask, addr);
+}
+
+static void pch_can_set_run_mode(struct pch_can_priv *priv,
+ enum pch_can_mode mode)
+{
+ switch (mode) {
+ case PCH_CAN_RUN:
+ pch_can_bit_clear(&priv->regs->cont, CAN_CTRL_INIT);
+ break;
+
+ case PCH_CAN_STOP:
+ pch_can_bit_set(&priv->regs->cont, CAN_CTRL_INIT);
+ break;
+
+ default:
+ dev_err(&priv->ndev->dev, "%s -> Invalid Mode.\n", __func__);
+ break;
+ }
+}
+
+static void pch_can_set_optmode(struct pch_can_priv *priv)
+{
+ u32 reg_val = ioread32(&priv->regs->opt);
+
+ if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
+ reg_val |= CAN_OPT_SILENT;
+
+ if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
+ reg_val |= CAN_OPT_LBACK;
+
+ pch_can_bit_set(&priv->regs->cont, CAN_CTRL_OPT);
+ iowrite32(reg_val, &priv->regs->opt);
+}
+
+static void pch_can_set_int_custom(struct pch_can_priv *priv)
+{
+ /* Clearing the IE, SIE and EIE bits of Can control register. */
+ pch_can_bit_clear(&priv->regs->cont, CAN_CTRL_IE_SIE_EIE);
+
+ /* Appropriately setting them. */
+ pch_can_bit_set(&priv->regs->cont,
+ ((priv->int_enables & MSK_CTRL_IE_SIE_EIE) << 1));
+}
+
+/* This function retrieves interrupt enabled for the CAN device. */
+static void pch_can_get_int_enables(struct pch_can_priv *priv, u32 *enables)
+{
+ /* Obtaining the status of IE, SIE and EIE interrupt bits. */
+ *enables = ((ioread32(&priv->regs->cont) & CAN_CTRL_IE_SIE_EIE) >> 1);
+}
+
+static void pch_can_set_int_enables(struct pch_can_priv *priv,
+ enum pch_can_mode interrupt_no)
+{
+ switch (interrupt_no) {
+ case PCH_CAN_ENABLE:
+ pch_can_bit_set(&priv->regs->cont, CAN_CTRL_IE);
+ break;
+
+ case PCH_CAN_DISABLE:
+ pch_can_bit_clear(&priv->regs->cont, CAN_CTRL_IE);
+ break;
+
+ case PCH_CAN_ALL:
+ pch_can_bit_set(&priv->regs->cont, CAN_CTRL_IE_SIE_EIE);
+ break;
+
+ case PCH_CAN_NONE:
+ pch_can_bit_clear(&priv->regs->cont, CAN_CTRL_IE_SIE_EIE);
+ break;
+
+ default:
+ dev_err(&priv->ndev->dev, "Invalid interrupt number.\n");
+ break;
+ }
+}
+
+static void pch_can_check_if_busy(u32 __iomem *creq_addr, u32 num)
+{
+ u32 counter = COUNTER_LIMIT;
+ u32 ifx_creq;
+
+ iowrite32(num, creq_addr);
+ while (counter) {
+ ifx_creq = ioread32(creq_addr) & CAN_IF_CREQ_BUSY;
+ if (!ifx_creq)
+ break;
+ counter--;
+ udelay(1);
+ }
+ if (!counter)
+ pr_err("%s:IF1 BUSY Flag is set forever.\n", __func__);
+}
+
+static void pch_can_set_rx_enable(struct pch_can_priv *priv, u32 buff_num,
+ u32 set)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv->msgif_reg_lock, flags);
+ /* Reading the receive buffer data from RAM to Interface1 registers */
+ iowrite32(CAN_CMASK_RX_TX_GET, &priv->regs->if1_cmask);
+ pch_can_check_if_busy(&priv->regs->if1_creq, buff_num);
+
+ /* Setting the IF1MASK1 register to access MsgVal and RxIE bits */
+ iowrite32(CAN_CMASK_RDWR | CAN_CMASK_ARB | CAN_CMASK_CTRL,
+ &priv->regs->if1_cmask);
+
+ if (set == ENABLE) {
+ /* Setting the MsgVal and RxIE bits */
+ pch_can_bit_set(&priv->regs->if1_mcont, CAN_IF_MCONT_RXIE);
+ pch_can_bit_set(&priv->regs->if1_id2, CAN_ID_MSGVAL);
+
+ } else if (set == DISABLE) {
+ /* Resetting the MsgVal and RxIE bits */
+ pch_can_bit_clear(&priv->regs->if1_mcont, CAN_IF_MCONT_RXIE);
+ pch_can_bit_clear(&priv->regs->if1_id2, CAN_ID_MSGVAL);
+ }
+
+ pch_can_check_if_busy(&priv->regs->if1_creq, buff_num);
+ spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
+}
+
+static void pch_can_rx_enable_all(struct pch_can_priv *priv)
+{
+ int i;
+
+ /* Traversing to obtain the object configured as receivers. */
+ for (i = 0; i < PCH_OBJ_NUM; i++) {
+ if (priv->msg_obj[i] == MSG_OBJ_RX)
+ pch_can_set_rx_enable(priv, i + 1, ENABLE);
+ }
+}
+
+static void pch_can_rx_disable_all(struct pch_can_priv *priv)
+{
+ int i;
+
+ /* Traversing to obtain the object configured as receivers. */
+ for (i = 0; i < PCH_OBJ_NUM; i++) {
+ if (priv->msg_obj[i] == MSG_OBJ_RX)
+ pch_can_set_rx_enable(priv, i + 1, DISABLE);
+ }
+}
+
+static void pch_can_set_tx_enable(struct pch_can_priv *priv, u32 buff_num,
+ u32 set)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv->msgif_reg_lock, flags);
+ /* Reading the Msg buffer from Message RAM to Interface2 registers. */
+ iowrite32(CAN_CMASK_RX_TX_GET, &priv->regs->if2_cmask);
+ pch_can_check_if_busy(&priv->regs->if2_creq, buff_num);
+
+ /* Setting the IF2CMASK register for accessing the
+ MsgVal and TxIE bits */
+ iowrite32(CAN_CMASK_RDWR | CAN_CMASK_ARB | CAN_CMASK_CTRL,
+ &priv->regs->if2_cmask);
+
+ if (set == ENABLE) {
+ /* Setting the MsgVal and TxIE bits */
+ pch_can_bit_set(&priv->regs->if2_mcont, CAN_IF_MCONT_TXIE);
+ pch_can_bit_set(&priv->regs->if2_id2, CAN_ID_MSGVAL);
+ } else if (set == DISABLE) {
+ /* Resetting the MsgVal and TxIE bits. */
+ pch_can_bit_clear(&priv->regs->if2_mcont, CAN_IF_MCONT_TXIE);
+ pch_can_bit_clear(&priv->regs->if2_id2, CAN_ID_MSGVAL);
+ }
+
+ pch_can_check_if_busy(&priv->regs->if2_creq, buff_num);
+ spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
+}
+
+static void pch_can_tx_enable_all(struct pch_can_priv *priv)
+{
+ int i;
+
+ /* Traversing to obtain the object configured as transmit object. */
+ for (i = 0; i < PCH_OBJ_NUM; i++) {
+ if (priv->msg_obj[i] == MSG_OBJ_TX)
+ pch_can_set_tx_enable(priv, i + 1, ENABLE);
+ }
+}
+
+static void pch_can_tx_disable_all(struct pch_can_priv *priv)
+{
+ int i;
+
+ /* Traversing to obtain the object configured as transmit object. */
+ for (i = 0; i < PCH_OBJ_NUM; i++) {
+ if (priv->msg_obj[i] == MSG_OBJ_TX)
+ pch_can_set_tx_enable(priv, i + 1, DISABLE);
+ }
+}
+
+static void pch_can_get_rx_enable(struct pch_can_priv *priv, u32 buff_num,
+ u32 *enable)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv->msgif_reg_lock, flags);
+ iowrite32(CAN_CMASK_RX_TX_GET, &priv->regs->if1_cmask);
+ pch_can_check_if_busy(&priv->regs->if1_creq, buff_num);
+
+ if (((ioread32(&priv->regs->if1_id2)) & CAN_ID_MSGVAL) &&
+ ((ioread32(&priv->regs->if1_mcont)) &
+ CAN_IF_MCONT_RXIE))
+ *enable = ENABLE;
+ else
+ *enable = DISABLE;
+ spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
+}
+
+static void pch_can_get_tx_enable(struct pch_can_priv *priv, u32 buff_num,
+ u32 *enable)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv->msgif_reg_lock, flags);
+ iowrite32(CAN_CMASK_RX_TX_GET, &priv->regs->if2_cmask);
+ pch_can_check_if_busy(&priv->regs->if2_creq, buff_num);
+
+ if (((ioread32(&priv->regs->if2_id2)) & CAN_ID_MSGVAL) &&
+ ((ioread32(&priv->regs->if2_mcont)) &
+ CAN_IF_MCONT_TXIE)) {
+ *enable = ENABLE;
+ } else {
+ *enable = DISABLE;
+ }
+ spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
+}
+
+static int pch_can_int_pending(struct pch_can_priv *priv)
+{
+ return ioread32(&priv->regs->intr) & 0xffff;
+}
+
+static void pch_can_set_rx_buffer_link(struct pch_can_priv *priv,
+ u32 buffer_num, u32 set)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv->msgif_reg_lock, flags);
+ iowrite32(CAN_CMASK_RX_TX_GET, &priv->regs->if1_cmask);
+ pch_can_check_if_busy(&priv->regs->if1_creq, buffer_num);
+ iowrite32(CAN_CMASK_RDWR | CAN_CMASK_CTRL, &priv->regs->if1_cmask);
+ if (set == ENABLE)
+ pch_can_bit_clear(&priv->regs->if1_mcont, CAN_IF_MCONT_EOB);
+ else
+ pch_can_bit_set(&priv->regs->if1_mcont, CAN_IF_MCONT_EOB);
+
+ pch_can_check_if_busy(&priv->regs->if1_creq, buffer_num);
+ spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
+}
+
+static void pch_can_get_rx_buffer_link(struct pch_can_priv *priv,
+ u32 buffer_num, u32 *link)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv->msgif_reg_lock, flags);
+ iowrite32(CAN_CMASK_RX_TX_GET, &priv->regs->if1_cmask);
+ pch_can_check_if_busy(&priv->regs->if1_creq, buffer_num);
+
+ if (ioread32(&priv->regs->if1_mcont) & CAN_IF_MCONT_EOB)
+ *link = DISABLE;
+ else
+ *link = ENABLE;
+ spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
+}
+
+static void pch_can_clear_buffers(struct pch_can_priv *priv)
+{
+ int i;
+
+ for (i = 0; i < PCH_RX_OBJ_NUM; i++) {
+ iowrite32(CAN_CMASK_RX_TX_SET, &priv->regs->if1_cmask);
+ iowrite32(0xffff, &priv->regs->if1_mask1);
+ iowrite32(0xffff, &priv->regs->if1_mask2);
+ iowrite32(0x0, &priv->regs->if1_id1);
+ iowrite32(0x0, &priv->regs->if1_id2);
+ iowrite32(0x0, &priv->regs->if1_mcont);
+ iowrite32(0x0, &priv->regs->if1_dataa1);
+ iowrite32(0x0, &priv->regs->if1_dataa2);
+ iowrite32(0x0, &priv->regs->if1_datab1);
+ iowrite32(0x0, &priv->regs->if1_datab2);
+ iowrite32(CAN_CMASK_RDWR | CAN_CMASK_MASK |
+ CAN_CMASK_ARB | CAN_CMASK_CTRL,
+ &priv->regs->if1_cmask);
+ pch_can_check_if_busy(&priv->regs->if1_creq, i+1);
+ }
+
+ for (i = i; i < PCH_OBJ_NUM; i++) {
+ iowrite32(CAN_CMASK_RX_TX_SET, &priv->regs->if2_cmask);
+ iowrite32(0xffff, &priv->regs->if2_mask1);
+ iowrite32(0xffff, &priv->regs->if2_mask2);
+ iowrite32(0x0, &priv->regs->if2_id1);
+ iowrite32(0x0, &priv->regs->if2_id2);
+ iowrite32(0x0, &priv->regs->if2_mcont);
+ iowrite32(0x0, &priv->regs->if2_dataa1);
+ iowrite32(0x0, &priv->regs->if2_dataa2);
+ iowrite32(0x0, &priv->regs->if2_datab1);
+ iowrite32(0x0, &priv->regs->if2_datab2);
+ iowrite32(CAN_CMASK_RDWR | CAN_CMASK_MASK |
+ CAN_CMASK_ARB | CAN_CMASK_CTRL,
+ &priv->regs->if2_cmask);
+ pch_can_check_if_busy(&priv->regs->if2_creq, i+1);
+ }
+}
+
+static void pch_can_config_rx_tx_buffers(struct pch_can_priv *priv)
+{
+ int i;
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv->msgif_reg_lock, flags);
+
+ for (i = 0; i < PCH_OBJ_NUM; i++) {
+ if (priv->msg_obj[i] == MSG_OBJ_RX) {
+ iowrite32(CAN_CMASK_RX_TX_GET,
+ &priv->regs->if1_cmask);
+ pch_can_check_if_busy(&priv->regs->if1_creq, i+1);
+
+ iowrite32(0x0, &priv->regs->if1_id1);
+ iowrite32(0x0, &priv->regs->if1_id2);
+
+ pch_can_bit_set(&priv->regs->if1_mcont,
+ CAN_IF_MCONT_UMASK);
+
+ /* Set FIFO mode set to 0 except last Rx Obj*/
+ pch_can_bit_clear(&priv->regs->if1_mcont,
+ CAN_IF_MCONT_EOB);
+ /* In case FIFO mode, Last EoB of Rx Obj must be 1 */
+ if (i == (PCH_RX_OBJ_NUM - 1))
+ pch_can_bit_set(&priv->regs->if1_mcont,
+ CAN_IF_MCONT_EOB);
+
+ iowrite32(0, &priv->regs->if1_mask1);
+ pch_can_bit_clear(&priv->regs->if1_mask2,
+ 0x1fff | CAN_MASK2_MDIR_MXTD);
+
+ /* Setting CMASK for writing */
+ iowrite32(CAN_CMASK_RDWR | CAN_CMASK_MASK |
+ CAN_CMASK_ARB | CAN_CMASK_CTRL,
+ &priv->regs->if1_cmask);
+
+ pch_can_check_if_busy(&priv->regs->if1_creq, i+1);
+ } else if (priv->msg_obj[i] == MSG_OBJ_TX) {
+ iowrite32(CAN_CMASK_RX_TX_GET,
+ &priv->regs->if2_cmask);
+ pch_can_check_if_busy(&priv->regs->if2_creq, i+1);
+
+ /* Resetting DIR bit for reception */
+ iowrite32(0x0, &priv->regs->if2_id1);
+ iowrite32(0x0, &priv->regs->if2_id2);
+ pch_can_bit_set(&priv->regs->if2_id2, CAN_ID2_DIR);
+
+ /* Setting EOB bit for transmitter */
+ iowrite32(CAN_IF_MCONT_EOB, &priv->regs->if2_mcont);
+
+ pch_can_bit_set(&priv->regs->if2_mcont,
+ CAN_IF_MCONT_UMASK);
+
+ iowrite32(0, &priv->regs->if2_mask1);
+ pch_can_bit_clear(&priv->regs->if2_mask2, 0x1fff);
+
+ /* Setting CMASK for writing */
+ iowrite32(CAN_CMASK_RDWR | CAN_CMASK_MASK |
+ CAN_CMASK_ARB | CAN_CMASK_CTRL,
+ &priv->regs->if2_cmask);
+
+ pch_can_check_if_busy(&priv->regs->if2_creq, i+1);
+ }
+ }
+ spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
+}
+
+static void pch_can_init(struct pch_can_priv *priv)
+{
+ /* Stopping the Can device. */
+ pch_can_set_run_mode(priv, PCH_CAN_STOP);
+
+ /* Clearing all the message object buffers. */
+ pch_can_clear_buffers(priv);
+
+ /* Configuring the respective message object as either rx/tx object. */
+ pch_can_config_rx_tx_buffers(priv);
+
+ /* Enabling the interrupts. */
+ pch_can_set_int_enables(priv, PCH_CAN_ALL);
+}
+
+static void pch_can_release(struct pch_can_priv *priv)
+{
+ /* Stooping the CAN device. */
+ pch_can_set_run_mode(priv, PCH_CAN_STOP);
+
+ /* Disabling the interrupts. */
+ pch_can_set_int_enables(priv, PCH_CAN_NONE);
+
+ /* Disabling all the receive object. */
+ pch_can_rx_disable_all(priv);
+
+ /* Disabling all the transmit object. */
+ pch_can_tx_disable_all(priv);
+}
+
+/* This function clears interrupt(s) from the CAN device. */
+static void pch_can_int_clr(struct pch_can_priv *priv, u32 mask)
+{
+ if (mask == CAN_STATUS_INT) {
+ ioread32(&priv->regs->stat);
+ return;
+ }
+
+ /* Clear interrupt for transmit object */
+ if (priv->msg_obj[mask - 1] == MSG_OBJ_TX) {
+ /* Setting CMASK for clearing interrupts for
+ frame transmission. */
+ iowrite32(CAN_CMASK_RDWR | CAN_CMASK_CTRL | CAN_CMASK_ARB,
+ &priv->regs->if2_cmask);
+
+ /* Resetting the ID registers. */
+ pch_can_bit_set(&priv->regs->if2_id2,
+ CAN_ID2_DIR | (0x7ff << 2));
+ iowrite32(0x0, &priv->regs->if2_id1);
+
+ /* Claring NewDat, TxRqst & IntPnd */
+ pch_can_bit_clear(&priv->regs->if2_mcont,
+ CAN_IF_MCONT_NEWDAT | CAN_IF_MCONT_INTPND |
+ CAN_IF_MCONT_TXRQXT);
+ pch_can_check_if_busy(&priv->regs->if2_creq, mask);
+ } else if (priv->msg_obj[mask - 1] == MSG_OBJ_RX) {
+ /* Setting CMASK for clearing the reception interrupts. */
+ iowrite32(CAN_CMASK_RDWR | CAN_CMASK_CTRL | CAN_CMASK_ARB,
+ &priv->regs->if1_cmask);
+
+ /* Clearing the Dir bit. */
+ pch_can_bit_clear(&priv->regs->if1_id2, CAN_ID2_DIR);
+
+ /* Clearing NewDat & IntPnd */
+ pch_can_bit_clear(&priv->regs->if1_mcont,
+ CAN_IF_MCONT_NEWDAT | CAN_IF_MCONT_INTPND);
+
+ pch_can_check_if_busy(&priv->regs->if1_creq, mask);
+ }
+}
+
+static int pch_can_get_buffer_status(struct pch_can_priv *priv)
+{
+ return (ioread32(&priv->regs->treq1) & 0xffff) |
+ ((ioread32(&priv->regs->treq2) & 0xffff) << 16);
+}
+
+static void pch_can_reset(struct pch_can_priv *priv)
+{
+ /* write to sw reset register */
+ iowrite32(1, &priv->regs->srst);
+ iowrite32(0, &priv->regs->srst);
+}
+
+static void pch_can_error(struct net_device *ndev, u32 status)
+{
+ struct sk_buff *skb;
+ struct pch_can_priv *priv = netdev_priv(ndev);
+ struct can_frame *cf;
+ u32 errc;
+ struct net_device_stats *stats = &(priv->ndev->stats);
+ enum can_state state = priv->can.state;
+
+ skb = alloc_can_err_skb(ndev, &cf);
+ if (!skb)
+ return;
+
+ if (status & PCH_BUS_OFF) {
+ pch_can_tx_disable_all(priv);
+ pch_can_rx_disable_all(priv);
+ state = CAN_STATE_BUS_OFF;
+ cf->can_id |= CAN_ERR_BUSOFF;
+ can_bus_off(ndev);
+ pch_can_set_run_mode(priv, PCH_CAN_RUN);
+ dev_err(&ndev->dev, "%s -> Bus Off occurres.\n", __func__);
+ }
+
+ /* Warning interrupt. */
+ if (status & PCH_EWARN) {
+ state = CAN_STATE_ERROR_WARNING;
+ priv->can.can_stats.error_warning++;
+ cf->can_id |= CAN_ERR_CRTL;
+ errc = ioread32(&priv->regs->errc);
+ if (((errc & CAN_REC) >> 8) > 96)
+ cf->data[1] |= CAN_ERR_CRTL_RX_WARNING;
+ if ((errc & CAN_TEC) > 96)
+ cf->data[1] |= CAN_ERR_CRTL_TX_WARNING;
+ dev_warn(&ndev->dev,
+ "%s -> Error Counter is more than 96.\n", __func__);
+ }
+ /* Error passive interrupt. */
+ if (status & PCH_EPASSIV) {
+ priv->can.can_stats.error_passive++;
+ state = CAN_STATE_ERROR_PASSIVE;
+ cf->can_id |= CAN_ERR_CRTL;
+ errc = ioread32(&priv->regs->errc);
+ if (((errc & CAN_REC) >> 8) > 127)
+ cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE;
+ if ((errc & CAN_TEC) > 127)
+ cf->data[1] |= CAN_ERR_CRTL_TX_PASSIVE;
+ dev_err(&ndev->dev,
+ "%s -> CAN controller is ERROR PASSIVE .\n", __func__);
+ }
+
+ if (status & PCH_LEC_ALL) {
+ priv->can.can_stats.bus_error++;
+ stats->rx_errors++;
+ switch (status & PCH_LEC_ALL) {
+ case PCH_STUF_ERR:
+ cf->data[2] |= CAN_ERR_PROT_STUFF;
+ break;
+ case PCH_FORM_ERR:
+ cf->data[2] |= CAN_ERR_PROT_FORM;
+ break;
+ case PCH_ACK_ERR:
+ cf->data[2] |= CAN_ERR_PROT_LOC_ACK |
+ CAN_ERR_PROT_LOC_ACK_DEL;
+ break;
+ case PCH_BIT1_ERR:
+ case PCH_BIT0_ERR:
+ cf->data[2] |= CAN_ERR_PROT_BIT;
+ break;
+ case PCH_CRC_ERR:
+ cf->data[2] |= CAN_ERR_PROT_LOC_CRC_SEQ |
+ CAN_ERR_PROT_LOC_CRC_DEL;
+ break;
+ default:
+ iowrite32(status | PCH_LEC_ALL, &priv->regs->stat);
+ break;
+ }
+
+ }
+
+ priv->can.state = state;
+ netif_rx(skb);
+
+ stats->rx_packets++;
+ stats->rx_bytes += cf->can_dlc;
+}
+
+static irqreturn_t pch_can_interrupt(int irq, void *dev_id)
+{
+ struct net_device *ndev = (struct net_device *)dev_id;
+ struct pch_can_priv *priv = netdev_priv(ndev);
+
+ pch_can_set_int_enables(priv, PCH_CAN_NONE);
+
+ napi_schedule(&priv->napi);
+
+ return IRQ_HANDLED;
+}
+
+static int pch_can_rx_normal(struct net_device *ndev, u32 int_stat)
+{
+ u32 reg;
+ canid_t id;
+ u32 ide;
+ u32 rtr;
+ int i, j, k;
+ int rcv_pkts = 0;
+ struct sk_buff *skb;
+ struct can_frame *cf;
+ struct pch_can_priv *priv = netdev_priv(ndev);
+ struct net_device_stats *stats = &(priv->ndev->stats);
+
+ /* Reading the messsage object from the Message RAM */
+ iowrite32(CAN_CMASK_RX_TX_GET, &priv->regs->if1_cmask);
+ pch_can_check_if_busy(&priv->regs->if1_creq, int_stat);
+
+ /* Reading the MCONT register. */
+ reg = ioread32(&priv->regs->if1_mcont);
+ reg &= 0xffff;
+
+ for (k = int_stat; !(reg & CAN_IF_MCONT_EOB); k++) {
+ /* If MsgLost bit set. */
+ if (reg & CAN_IF_MCONT_MSGLOST) {
+ dev_err(&priv->ndev->dev, "Msg Obj is overwritten.\n");
+ pch_can_bit_clear(&priv->regs->if1_mcont,
+ CAN_IF_MCONT_MSGLOST);
+ iowrite32(CAN_CMASK_RDWR | CAN_CMASK_CTRL,
+ &priv->regs->if1_cmask);
+ pch_can_check_if_busy(&priv->regs->if1_creq, k);
+
+ skb = alloc_can_err_skb(ndev, &cf);
+ if (!skb)
+ return -ENOMEM;
+
+ priv->can.can_stats.error_passive++;
+ priv->can.state = CAN_STATE_ERROR_PASSIVE;
+ cf->can_id |= CAN_ERR_CRTL;
+ cf->data[1] |= CAN_ERR_CRTL_RX_OVERFLOW;
+ cf->data[2] |= CAN_ERR_PROT_OVERLOAD;
+ stats->rx_packets++;
+ stats->rx_bytes += cf->can_dlc;
+
+ netif_receive_skb(skb);
+ rcv_pkts++;
+ goto RX_NEXT;
+ }
+ if (!(reg & CAN_IF_MCONT_NEWDAT))
+ goto RX_NEXT;
+
+ skb = alloc_can_skb(priv->ndev, &cf);
+ if (!skb)
+ return -ENOMEM;
+
+ /* Get Received data */
+ ide = ((ioread32(&priv->regs->if1_id2)) & CAN_ID2_XTD) >> 14;
+ if (ide) {
+ id = (ioread32(&priv->regs->if1_id1) & 0xffff);
+ id |= (((ioread32(&priv->regs->if1_id2)) &
+ 0x1fff) << 16);
+ cf->can_id = (id & CAN_EFF_MASK) | CAN_EFF_FLAG;
+ } else {
+ id = (((ioread32(&priv->regs->if1_id2)) &
+ (CAN_SFF_MASK << 2)) >> 2);
+ cf->can_id = (id & CAN_SFF_MASK);
+ }
+
+ rtr = (ioread32(&priv->regs->if1_id2) & CAN_ID2_DIR);
+ if (rtr) {
+ cf->can_dlc = 0;
+ cf->can_id |= CAN_RTR_FLAG;
+ } else {
+ cf->can_dlc = ((ioread32(&priv->regs->if1_mcont)) &
+ 0x0f);
+ }
+
+ for (i = 0, j = 0; i < cf->can_dlc; j++) {
+ reg = ioread32(&priv->regs->if1_dataa1 + j*4);
+ cf->data[i++] = cpu_to_le32(reg & 0xff);
+ if (i == cf->can_dlc)
+ break;
+ cf->data[i++] = cpu_to_le32((reg >> 8) & 0xff);
+ }
+
+ netif_receive_skb(skb);
+ rcv_pkts++;
+ stats->rx_packets++;
+ stats->rx_bytes += cf->can_dlc;
+
+ if (k < PCH_FIFO_THRESH) {
+ iowrite32(CAN_CMASK_RDWR | CAN_CMASK_CTRL |
+ CAN_CMASK_ARB, &priv->regs->if1_cmask);
+
+ /* Clearing the Dir bit. */
+ pch_can_bit_clear(&priv->regs->if1_id2, CAN_ID2_DIR);
+
+ /* Clearing NewDat & IntPnd */
+ pch_can_bit_clear(&priv->regs->if1_mcont,
+ CAN_IF_MCONT_INTPND);
+ pch_can_check_if_busy(&priv->regs->if1_creq, k);
+ } else if (k > PCH_FIFO_THRESH) {
+ pch_can_int_clr(priv, k);
+ } else if (k == PCH_FIFO_THRESH) {
+ int cnt;
+ for (cnt = 0; cnt < PCH_FIFO_THRESH; cnt++)
+ pch_can_int_clr(priv, cnt+1);
+ }
+RX_NEXT:
+ /* Reading the messsage object from the Message RAM */
+ iowrite32(CAN_CMASK_RX_TX_GET, &priv->regs->if1_cmask);
+ pch_can_check_if_busy(&priv->regs->if1_creq, k + 1);
+ reg = ioread32(&priv->regs->if1_mcont);
+ }
+
+ return rcv_pkts;
+}
+static int pch_can_rx_poll(struct napi_struct *napi, int quota)
+{
+ struct net_device *ndev = napi->dev;
+ struct pch_can_priv *priv = netdev_priv(ndev);
+ struct net_device_stats *stats = &(priv->ndev->stats);
+ u32 dlc;
+ u32 int_stat;
+ int rcv_pkts = 0;
+ u32 reg_stat;
+ unsigned long flags;
+
+ int_stat = pch_can_int_pending(priv);
+ if (!int_stat)
+ return 0;
+
+INT_STAT:
+ if (int_stat == CAN_STATUS_INT) {
+ reg_stat = ioread32(&priv->regs->stat);
+ if (reg_stat & (PCH_BUS_OFF | PCH_LEC_ALL)) {
+ if ((reg_stat & PCH_LEC_ALL) != PCH_LEC_ALL)
+ pch_can_error(ndev, reg_stat);
+ }
+
+ if (reg_stat & PCH_TX_OK) {
+ spin_lock_irqsave(&priv->msgif_reg_lock, flags);
+ iowrite32(CAN_CMASK_RX_TX_GET, &priv->regs->if2_cmask);
+ pch_can_check_if_busy(&priv->regs->if2_creq,
+ ioread32(&priv->regs->intr));
+ spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
+ pch_can_bit_clear(&priv->regs->stat, PCH_TX_OK);
+ }
+
+ if (reg_stat & PCH_RX_OK)
+ pch_can_bit_clear(&priv->regs->stat, PCH_RX_OK);
+
+ int_stat = pch_can_int_pending(priv);
+ if (int_stat == CAN_STATUS_INT)
+ goto INT_STAT;
+ }
+
+MSG_OBJ:
+ if ((int_stat >= 1) && (int_stat <= PCH_RX_OBJ_NUM)) {
+ spin_lock_irqsave(&priv->msgif_reg_lock, flags);
+ rcv_pkts = pch_can_rx_normal(ndev, int_stat);
+ spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
+ if (rcv_pkts < 0)
+ return 0;
+ } else if ((int_stat > PCH_RX_OBJ_NUM) && (int_stat <= PCH_OBJ_NUM)) {
+ if (priv->msg_obj[int_stat - 1] == MSG_OBJ_TX) {
+ /* Handle transmission interrupt */
+ can_get_echo_skb(ndev, int_stat - PCH_RX_OBJ_NUM - 1);
+ spin_lock_irqsave(&priv->msgif_reg_lock, flags);
+ iowrite32(CAN_CMASK_RX_TX_GET | CAN_CMASK_CLRINTPND,
+ &priv->regs->if2_cmask);
+ dlc = ioread32(&priv->regs->if2_mcont) &
+ CAN_IF_MCONT_DLC;
+ pch_can_check_if_busy(&priv->regs->if2_creq, int_stat);
+ spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
+ if (dlc > 8)
+ dlc = 8;
+ stats->tx_bytes += dlc;
+ stats->tx_packets++;
+ }
+ }
+
+ int_stat = pch_can_int_pending(priv);
+ if (int_stat == CAN_STATUS_INT)
+ goto INT_STAT;
+ else if (int_stat >= 1 && int_stat <= 32)
+ goto MSG_OBJ;
+
+ napi_complete(napi);
+ pch_can_set_int_enables(priv, PCH_CAN_ALL);
+
+ return rcv_pkts;
+}
+
+static int pch_set_bittiming(struct net_device *ndev)
+{
+ struct pch_can_priv *priv = netdev_priv(ndev);
+ const struct can_bittiming *bt = &priv->can.bittiming;
+ u32 canbit;
+ u32 bepe;
+ u32 brp;
+
+ /* Setting the CCE bit for accessing the Can Timing register. */
+ pch_can_bit_set(&priv->regs->cont, CAN_CTRL_CCE);
+
+ brp = (bt->tq) / (1000000000/PCH_CAN_CLK) - 1;
+ canbit = brp & MSK_BITT_BRP;
+ canbit |= (bt->sjw - 1) << BIT_BITT_SJW;
+ canbit |= (bt->phase_seg1 + bt->prop_seg - 1) << BIT_BITT_TSEG1;
+ canbit |= (bt->phase_seg2 - 1) << BIT_BITT_TSEG2;
+ bepe = (brp & MSK_BRPE_BRPE) >> BIT_BRPE_BRPE;
+ iowrite32(canbit, &priv->regs->bitt);
+ iowrite32(bepe, &priv->regs->brpe);
+ pch_can_bit_clear(&priv->regs->cont, CAN_CTRL_CCE);
+
+ return 0;
+}
+
+static void pch_can_start(struct net_device *ndev)
+{
+ struct pch_can_priv *priv = netdev_priv(ndev);
+
+ if (priv->can.state != CAN_STATE_STOPPED)
+ pch_can_reset(priv);
+
+ pch_set_bittiming(ndev);
+ pch_can_set_optmode(priv);
+
+ pch_can_tx_enable_all(priv);
+ pch_can_rx_enable_all(priv);
+
+ /* Setting the CAN to run mode. */
+ pch_can_set_run_mode(priv, PCH_CAN_RUN);
+
+ priv->can.state = CAN_STATE_ERROR_ACTIVE;
+
+ return;
+}
+
+static int pch_can_do_set_mode(struct net_device *ndev, enum can_mode mode)
+{
+ int ret = 0;
+
+ switch (mode) {
+ case CAN_MODE_START:
+ pch_can_start(ndev);
+ netif_wake_queue(ndev);
+ break;
+ default:
+ ret = -EOPNOTSUPP;
+ break;
+ }
+
+ return ret;
+}
+
+static int pch_can_open(struct net_device *ndev)
+{
+ struct pch_can_priv *priv = netdev_priv(ndev);
+ int retval;
+
+ retval = pci_enable_msi(priv->dev);
+ if (retval) {
+ dev_info(&ndev->dev, "PCH CAN opened without MSI\n");
+ priv->use_msi = 0;
+ } else {
+ dev_info(&ndev->dev, "PCH CAN opened with MSI\n");
+ priv->use_msi = 1;
+ }
+
+ /* Regsitering the interrupt. */
+ retval = request_irq(priv->dev->irq, pch_can_interrupt, IRQF_SHARED,
+ ndev->name, ndev);
+ if (retval) {
+ dev_err(&ndev->dev, "request_irq failed.\n");
+ goto req_irq_err;
+ }
+
+ /* Open common can device */
+ retval = open_candev(ndev);
+ if (retval) {
+ dev_err(ndev->dev.parent, "open_candev() failed %d\n", retval);
+ goto err_open_candev;
+ }
+
+ pch_can_init(priv);
+ pch_can_start(ndev);
+ napi_enable(&priv->napi);
+ netif_start_queue(ndev);
+
+ return 0;
+
+err_open_candev:
+ free_irq(priv->dev->irq, ndev);
+req_irq_err:
+ if (priv->use_msi)
+ pci_disable_msi(priv->dev);
+
+ pch_can_release(priv);
+
+ return retval;
+}
+
+static int pch_close(struct net_device *ndev)
+{
+ struct pch_can_priv *priv = netdev_priv(ndev);
+
+ netif_stop_queue(ndev);
+ napi_disable(&priv->napi);
+ pch_can_release(priv);
+ free_irq(priv->dev->irq, ndev);
+ if (priv->use_msi)
+ pci_disable_msi(priv->dev);
+ close_candev(ndev);
+ priv->can.state = CAN_STATE_STOPPED;
+ return 0;
+}
+
+static int pch_get_msg_obj_sts(struct net_device *ndev, u32 obj_id)
+{
+ u32 buffer_status = 0;
+ struct pch_can_priv *priv = netdev_priv(ndev);
+
+ /* Getting the message object status. */
+ buffer_status = (u32) pch_can_get_buffer_status(priv);
+
+ return buffer_status & obj_id;
+}
+
+
+static netdev_tx_t pch_xmit(struct sk_buff *skb, struct net_device *ndev)
+{
+ int i, j;
+ unsigned long flags;
+ struct pch_can_priv *priv = netdev_priv(ndev);
+ struct can_frame *cf = (struct can_frame *)skb->data;
+ int tx_buffer_avail = 0;
+
+ if (can_dropped_invalid_skb(ndev, skb))
+ return NETDEV_TX_OK;
+
+ if (priv->tx_obj == (PCH_OBJ_NUM + 1)) { /* Point tail Obj */
+ while (pch_get_msg_obj_sts(ndev, (((1 << PCH_TX_OBJ_NUM)-1) <<
+ PCH_RX_OBJ_NUM)))
+ udelay(500);
+
+ priv->tx_obj = PCH_RX_OBJ_NUM + 1; /* Point head of Tx Obj ID */
+ tx_buffer_avail = priv->tx_obj; /* Point Tail of Tx Obj */
+ } else {
+ tx_buffer_avail = priv->tx_obj;
+ }
+ priv->tx_obj++;
+
+ /* Attaining the lock. */
+ spin_lock_irqsave(&priv->msgif_reg_lock, flags);
+
+ /* Reading the Msg Obj from the Msg RAM to the Interface register. */
+ iowrite32(CAN_CMASK_RX_TX_GET, &priv->regs->if2_cmask);
+ pch_can_check_if_busy(&priv->regs->if2_creq, tx_buffer_avail);
+
+ /* Setting the CMASK register. */
+ pch_can_bit_set(&priv->regs->if2_cmask, CAN_CMASK_ALL);
+
+ /* If ID extended is set. */
+ pch_can_bit_clear(&priv->regs->if2_id1, 0xffff);
+ pch_can_bit_clear(&priv->regs->if2_id2, 0x1fff | CAN_ID2_XTD);
+ if (cf->can_id & CAN_EFF_FLAG) {
+ pch_can_bit_set(&priv->regs->if2_id1, cf->can_id & 0xffff);
+ pch_can_bit_set(&priv->regs->if2_id2,
+ ((cf->can_id >> 16) & 0x1fff) | CAN_ID2_XTD);
+ } else {
+ pch_can_bit_set(&priv->regs->if2_id1, 0);
+ pch_can_bit_set(&priv->regs->if2_id2,
+ (cf->can_id & CAN_SFF_MASK) << 2);
+ }
+
+ /* If remote frame has to be transmitted.. */
+ if (cf->can_id & CAN_RTR_FLAG)
+ pch_can_bit_clear(&priv->regs->if2_id2, CAN_ID2_DIR);
+
+ for (i = 0, j = 0; i < cf->can_dlc; j++) {
+ iowrite32(le32_to_cpu(cf->data[i++]),
+ (&priv->regs->if2_dataa1) + j*4);
+ if (i == cf->can_dlc)
+ break;
+ iowrite32(le32_to_cpu(cf->data[i++] << 8),
+ (&priv->regs->if2_dataa1) + j*4);
+ }
+
+ can_put_echo_skb(skb, ndev, tx_buffer_avail - PCH_RX_OBJ_NUM - 1);
+
+ /* Updating the size of the data. */
+ pch_can_bit_clear(&priv->regs->if2_mcont, 0x0f);
+ pch_can_bit_set(&priv->regs->if2_mcont, cf->can_dlc);
+
+ /* Clearing IntPend, NewDat & TxRqst */
+ pch_can_bit_clear(&priv->regs->if2_mcont,
+ CAN_IF_MCONT_NEWDAT | CAN_IF_MCONT_INTPND |
+ CAN_IF_MCONT_TXRQXT);
+
+ /* Setting NewDat, TxRqst bits */
+ pch_can_bit_set(&priv->regs->if2_mcont,
+ CAN_IF_MCONT_NEWDAT | CAN_IF_MCONT_TXRQXT);
+
+ pch_can_check_if_busy(&priv->regs->if2_creq, tx_buffer_avail);
+
+ spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
+
+ return NETDEV_TX_OK;
+}
+
+static const struct net_device_ops pch_can_netdev_ops = {
+ .ndo_open = pch_can_open,
+ .ndo_stop = pch_close,
+ .ndo_start_xmit = pch_xmit,
+};
+
+static void __devexit pch_can_remove(struct pci_dev *pdev)
+{
+ struct net_device *ndev = pci_get_drvdata(pdev);
+ struct pch_can_priv *priv = netdev_priv(ndev);
+
+ unregister_candev(priv->ndev);
+ free_candev(priv->ndev);
+ pci_iounmap(pdev, priv->regs);
+ pci_release_regions(pdev);
+ pci_disable_device(pdev);
+ pci_set_drvdata(pdev, NULL);
+ pch_can_reset(priv);
+}
+
+#ifdef CONFIG_PM
+static int pch_can_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+ int i; /* Counter variable. */
+ int retval; /* Return value. */
+ u32 buf_stat; /* Variable for reading the transmit buffer status. */
+ u32 counter = 0xFFFFFF;
+
+ struct net_device *dev = pci_get_drvdata(pdev);
+ struct pch_can_priv *priv = netdev_priv(dev);
+
+ /* Stop the CAN controller */
+ pch_can_set_run_mode(priv, PCH_CAN_STOP);
+
+ /* Indicate that we are aboutto/in suspend */
+ priv->can.state = CAN_STATE_SLEEPING;
+
+ /* Waiting for all transmission to complete. */
+ while (counter) {
+ buf_stat = pch_can_get_buffer_status(priv);
+ if (!buf_stat)
+ break;
+ counter--;
+ udelay(1);
+ }
+ if (!counter)
+ dev_err(&pdev->dev, "%s -> Transmission time out.\n", __func__);
+
+ /* Save interrupt configuration and then disable them */
+ pch_can_get_int_enables(priv, &(priv->int_enables));
+ pch_can_set_int_enables(priv, PCH_CAN_DISABLE);
+
+ /* Save Tx buffer enable state */
+ for (i = 0; i < PCH_OBJ_NUM; i++) {
+ if (priv->msg_obj[i] == MSG_OBJ_TX)
+ pch_can_get_tx_enable(priv, i + 1,
+ &(priv->tx_enable[i]));
+ }
+
+ /* Disable all Transmit buffers */
+ pch_can_tx_disable_all(priv);
+
+ /* Save Rx buffer enable state */
+ for (i = 0; i < PCH_OBJ_NUM; i++) {
+ if (priv->msg_obj[i] == MSG_OBJ_RX) {
+ pch_can_get_rx_enable(priv, i + 1,
+ &(priv->rx_enable[i]));
+ pch_can_get_rx_buffer_link(priv, i + 1,
+ &(priv->rx_link[i]));
+ }
+ }
+
+ /* Disable all Receive buffers */
+ pch_can_rx_disable_all(priv);
+ retval = pci_save_state(pdev);
+ if (retval) {
+ dev_err(&pdev->dev, "pci_save_state failed.\n");
+ } else {
+ pci_enable_wake(pdev, PCI_D3hot, 0);
+ pci_disable_device(pdev);
+ pci_set_power_state(pdev, pci_choose_state(pdev, state));
+ }
+
+ return retval;
+}
+
+static int pch_can_resume(struct pci_dev *pdev)
+{
+ int i; /* Counter variable. */
+ int retval; /* Return variable. */
+ struct net_device *dev = pci_get_drvdata(pdev);
+ struct pch_can_priv *priv = netdev_priv(dev);
+
+ pci_set_power_state(pdev, PCI_D0);
+ pci_restore_state(pdev);
+ retval = pci_enable_device(pdev);
+ if (retval) {
+ dev_err(&pdev->dev, "pci_enable_device failed.\n");
+ return retval;
+ }
+
+ pci_enable_wake(pdev, PCI_D3hot, 0);
+
+ priv->can.state = CAN_STATE_ERROR_ACTIVE;
+
+ /* Disabling all interrupts. */
+ pch_can_set_int_enables(priv, PCH_CAN_DISABLE);
+
+ /* Setting the CAN device in Stop Mode. */
+ pch_can_set_run_mode(priv, PCH_CAN_STOP);
+
+ /* Configuring the transmit and receive buffers. */
+ pch_can_config_rx_tx_buffers(priv);
+
+ /* Restore the CAN state */
+ pch_set_bittiming(dev);
+
+ /* Listen/Active */
+ pch_can_set_optmode(priv);
+
+ /* Enabling the transmit buffer. */
+ for (i = 0; i < PCH_OBJ_NUM; i++) {
+ if (priv->msg_obj[i] == MSG_OBJ_TX) {
+ pch_can_set_tx_enable(priv, i + 1,
+ priv->tx_enable[i]);
+ }
+ }
+
+ /* Configuring the receive buffer and enabling them. */
+ for (i = 0; i < PCH_OBJ_NUM; i++) {
+ if (priv->msg_obj[i] == MSG_OBJ_RX) {
+ /* Restore buffer link */
+ pch_can_set_rx_buffer_link(priv, i + 1,
+ priv->rx_link[i]);
+
+ /* Restore buffer enables */
+ pch_can_set_rx_enable(priv, i + 1, priv->rx_enable[i]);
+ }
+ }
+
+ /* Enable CAN Interrupts */
+ pch_can_set_int_custom(priv);
+
+ /* Restore Run Mode */
+ pch_can_set_run_mode(priv, PCH_CAN_RUN);
+
+ return retval;
+}
+#else
+#define pch_can_suspend NULL
+#define pch_can_resume NULL
+#endif
+
+static int pch_can_get_berr_counter(const struct net_device *dev,
+ struct can_berr_counter *bec)
+{
+ struct pch_can_priv *priv = netdev_priv(dev);
+
+ bec->txerr = ioread32(&priv->regs->errc) & CAN_TEC;
+ bec->rxerr = (ioread32(&priv->regs->errc) & CAN_REC) >> 8;
+
+ return 0;
+}
+
+static int __devinit pch_can_probe(struct pci_dev *pdev,
+ const struct pci_device_id *id)
+{
+ struct net_device *ndev;
+ struct pch_can_priv *priv;
+ int rc;
+ int index;
+ void __iomem *addr;
+
+ rc = pci_enable_device(pdev);
+ if (rc) {
+ dev_err(&pdev->dev, "Failed pci_enable_device %d\n", rc);
+ goto probe_exit_endev;
+ }
+
+ rc = pci_request_regions(pdev, KBUILD_MODNAME);
+ if (rc) {
+ dev_err(&pdev->dev, "Failed pci_request_regions %d\n", rc);
+ goto probe_exit_pcireq;
+ }
+
+ addr = pci_iomap(pdev, 1, 0);
+ if (!addr) {
+ rc = -EIO;
+ dev_err(&pdev->dev, "Failed pci_iomap\n");
+ goto probe_exit_ipmap;
+ }
+
+ ndev = alloc_candev(sizeof(struct pch_can_priv), PCH_TX_OBJ_NUM);
+ if (!ndev) {
+ rc = -ENOMEM;
+ dev_err(&pdev->dev, "Failed alloc_candev\n");
+ goto probe_exit_alloc_candev;
+ }
+
+ priv = netdev_priv(ndev);
+ priv->ndev = ndev;
+ priv->regs = addr;
+ priv->dev = pdev;
+ priv->can.bittiming_const = &pch_can_bittiming_const;
+ priv->can.do_set_mode = pch_can_do_set_mode;
+ priv->can.do_get_berr_counter = pch_can_get_berr_counter;
+ priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY |
+ CAN_CTRLMODE_LOOPBACK;
+ priv->tx_obj = PCH_RX_OBJ_NUM + 1; /* Point head of Tx Obj */
+
+ ndev->irq = pdev->irq;
+ ndev->flags |= IFF_ECHO;
+
+ pci_set_drvdata(pdev, ndev);
+ SET_NETDEV_DEV(ndev, &pdev->dev);
+ ndev->netdev_ops = &pch_can_netdev_ops;
+
+ priv->can.clock.freq = PCH_CAN_CLK; /* Hz */
+ for (index = 0; index < PCH_RX_OBJ_NUM;)
+ priv->msg_obj[index++] = MSG_OBJ_RX;
+
+ for (index = index; index < PCH_OBJ_NUM;)
+ priv->msg_obj[index++] = MSG_OBJ_TX;
+
+ netif_napi_add(ndev, &priv->napi, pch_can_rx_poll, PCH_RX_OBJ_NUM);
+
+ rc = register_candev(ndev);
+ if (rc) {
+ dev_err(&pdev->dev, "Failed register_candev %d\n", rc);
+ goto probe_exit_reg_candev;
+ }
+
+ return 0;
+
+probe_exit_reg_candev:
+ free_candev(ndev);
+probe_exit_alloc_candev:
+ pci_iounmap(pdev, addr);
+probe_exit_ipmap:
+ pci_release_regions(pdev);
+probe_exit_pcireq:
+ pci_disable_device(pdev);
+probe_exit_endev:
+ return rc;
+}
+
+static struct pci_driver pch_can_pcidev = {
+ .name = "pch_can",
+ .id_table = pch_pci_tbl,
+ .probe = pch_can_probe,
+ .remove = __devexit_p(pch_can_remove),
+ .suspend = pch_can_suspend,
+ .resume = pch_can_resume,
+};
+
+static int __init pch_can_pci_init(void)
+{
+ return pci_register_driver(&pch_can_pcidev);
+}
+module_init(pch_can_pci_init);
+
+static void __exit pch_can_pci_exit(void)
+{
+ pci_unregister_driver(&pch_can_pcidev);
+}
+module_exit(pch_can_pci_exit);
+
+MODULE_DESCRIPTION("Controller Area Network Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_VERSION("0.94");
projects / GitHub / LineageOS / android_kernel_samsung_universal7580.git / commitdiff