Hello,
On 10/29/2010 09:32 PM, Wolfgang Grandegger wrote:
some comments inline.
[...]
>>> --- /dev/null
>>> +++ b/drivers/net/can/pch_can.c
>>> @@ -0,0 +1,1436 @@
>>> +/*
>>> + * 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 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
>>
>> A prefix for like PCH_ instead of CAN_ for all those define above would
>> be fine to avoid namespace clashes and/or confusion with the defines from the socketcan framework.
>>
>>> +
>>> +#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
>>
>> These are just single set bit, please use BIT()
>> Consider adding the name of the corresponding register to the define's
>> name.
>>
>>> +#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)
>
> This is an enumeration:
>
> enum {
> PCH_STUF_ERR = 1,
> PCH_FORM_ERR,
> PCH_ACK_ERR,
> PCH_BIT1_ERR;
> PCH_BIT0_ERR,
> PCH_CRC_ERR,
> PCH_LEC_ALL;
^
","
> }
^
";"
>
> Also, s/PCH_/PCH_LEC_/ would be nice.
ACK
>
>>> +/* 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
>>
>> these are usually called SHIFT
>>
>>> +#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
>>
>> MSK or MASK is okay, however the last two are just single bits.
>>
>> Please add a PCH_ prefix here, too.
>>
>>> +#define PCH_CAN_NO_TX_BUFF 1
>>> +#define COUNTER_LIMIT 10
>>
>> dito
>>
>>> +
>>> +#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)
>>
>> You define MAX_MSG_OBJ earlier, seems like two names for the same value.
>>
>>> +
>>> +#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;
>>
>> VVVV
>>> + 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;
>> ^^^^
>>
>> these registers and....
>>
>>> + u32 reserve2;
>>> + u32 reserve3[12];
>>
>> ...and these
>>
>> VVVV
>>> + 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;
>>
>> ^^^^
>>
>> ...are identical. I suggest to make a struct defining a complete
>> "Message Interface Register Set". If you include the correct number of
>> reserved bytes in the struct, you can have an array of two of these
>> structs in the struct pch_can_regs.
>
> Yep, that would be nice. Using it consequently would also allow to
> remove duplicated code efficiently. I will name it "struct pch_can_if"
> for latter references.
>
>>
>>> + u32 reserve4;
>>> + u32 reserve5[20];
>>> + u32 treq1;
>>> + u32 treq2;
>>> + u32 reserve6[2];
>>> + u32 reserve7[56];
>>> + u32 reserve8[3];
>
> Why not just one reserveX ?
>
>>> + u32 srst;
>>> +};
>>> +
>>> +struct pch_can_priv {
>>> + struct can_priv can;
>>> + 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*/
>> ^^^
>> please add a whitespace
>>
>>> + 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 = "pch_can",
>>> + .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)
>> ^^^^^
>>
>> that should be an void __iomem *, see mail I've send the other day.
>> Please use sparse to check for this kinds of errors.
>> (Compile the driver with C=2, i.e.: make drivers/net/can/pch_can.ko C=2)
>>
>>> +{
>>> + iowrite32(ioread32(addr) | mask, addr);
>>> +}
>>> +
>>> +static inline void pch_can_bit_clear(u32 *addr, u32 mask)
>> ^^^^^
>>
>> dito
>>
>>> +{
>>> + 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);
>>> +}
>>> +
>>
>> IMHO the function name is missleading, if I understand the code
>> correctly, this functions triggers the transmission of the message.
>> After this it checks for busy, but
>>
>>> +static void pch_can_check_if_busy(u32 __iomem *creq_addr, u32 num)
>> ^^^^
>>
>> that should probaby be a void
>
> With separate structs for if1 and i2, a pointer to the relevant "struct
> pch_can_if" could be passed instead.
>
>>> +{
>>> + 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_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);
>>
>> noone uses this case.
>>
>>> + 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_set_rx_enable(struct pch_can_priv *priv, u32 buff_num,
>>> + int 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 == 1) {
>>> + /* 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 == 0) {
>>> + /* 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);
>>> + }
>
> Why not just?
>
> if (set)
> else
>
>
>>> + 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 = 1; i <= PCH_RX_OBJ_NUM; i++)
>>> + pch_can_set_rx_enable(priv, i, 1);
>>> +}
>>> +
>>> +static void pch_can_rx_disable_all(struct pch_can_priv *priv)
>>> +{
>>> + int i;
>>> +
>>> + /* Traversing to obtain the object configured as receivers. */
>>> + for (i = 1; i <= PCH_RX_OBJ_NUM; i++)
>>> + pch_can_set_rx_enable(priv, i, 0);
>>> +}
>>> +
>>> +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 == 1) {
>>> + /* 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 == 0) {
>>> + /* 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);
>>> +}
>
> That function is almost identical to pch_can_set_rx_enable. Just if2 is
> used instead of if1 and CAN_IF_MCONT_TXIE instead of CAN_IF_MCONT_RXIE.
> With separate "struct pch_can_if" for if1 and if2, it could be handled
> by a common function.
>
>>> +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 = PCH_RX_OBJ_NUM + 1; i <= PCH_OBJ_NUM; i++)
>>> + pch_can_set_tx_enable(priv, i, 1);
>>> +}
>>> +
>>> +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 = PCH_RX_OBJ_NUM + 1; i <= PCH_OBJ_NUM; i++)
>>> + pch_can_set_tx_enable(priv, i, 0);
>>> +}
>
> I think there is no need for separate functions for enable and disable.
> Just pass "enable" 0 or 1 like you do with "set" above.
>
>>> +static int pch_can_int_pending(struct pch_can_priv *priv)
>> ^^^
>>
>> make it u32 as it returns a register value, or a u16 as you only use
>> the 16 lower bits.
>>
>>> +{
>>> + return ioread32(&priv->regs->intr) & 0xffff;
>>> +}
>>> +
>>> +static void pch_can_clear_buffers(struct pch_can_priv *priv)
>>> +{
>>> + int i; /* Msg Obj ID (1~32) */
>>> +
>>> + for (i = 1; i <= PCH_RX_OBJ_NUM; i++) {
>>
>> IMHO the readability would be improved if you define something like
>> PCH_RX_OBJ_START and PCH_RX_OBJ_END.
>>
>>> + 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);
>>> + }
>>> +
>>> + for (i = PCH_RX_OBJ_NUM + 1; i <= PCH_OBJ_NUM; i++) {
>> ^^^^^^^^^^^^^^^^^^
>> dito for TX objects
>>
>>> + 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);
>
> This is almost the same code as above, just if2 instead of if1. With
> separate "struct pch_can_if" for if1 and i2, it could be handled by a
> common function.
>
>>> + }
>>> +}
>>> +
>>> +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 = 1; i <= PCH_RX_OBJ_NUM; i++) {
>>> + iowrite32(CAN_CMASK_RX_TX_GET, &priv->regs->if1_cmask);
>>> + pch_can_check_if_busy(&priv->regs->if1_creq, i);
>>
>> If I understand the code correctly, the about function triggers a
>> transfer. Why do you first trigger a transfer, then set the message contents....
>>> +
>>> + iowrite32(0x0, &priv->regs->if1_id1);
>>> + iowrite32(0x0, &priv->regs->if1_id2);
>>> +
>>> + pch_can_bit_set(&priv->regs->if1_mcont, CAN_IF_MCONT_UMASK);
>>
>> Why do you set the "Use acceptance mask" bit? We want to receive
>> all can messages.
>>
>>> +
>>> + /* 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);
>>
>> Make it if () { } else { }, please.
>>
>>> +
>>> + 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);
>>
>> ...and then trigger the transfer again?
>>
>>> + }
>>> +
>>> + for (i = PCH_RX_OBJ_NUM + 1; i <= PCH_OBJ_NUM; i++) {
>>> + iowrite32(CAN_CMASK_RX_TX_GET, &priv->regs->if2_cmask);
>>> + pch_can_check_if_busy(&priv->regs->if2_creq, i);
>>
>> same question about triggering the transfer 2 times applied here, too
>>> +
>>> + /* 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);
>>
>> Can you combine the two accesses to >if2_id2 into one?
>>
>>> +
>>> + /* 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);
>>
>> dito for if2_mcont
>>
>>> +
>>> + 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);
>>> + }
>>> +
>>> + 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) {
>>
>> is this a valid case?
>>
>>> + ioread32(&priv->regs->stat);
>>> + return;
>>> + }
>>> +
>>> + /* Clear interrupt for transmit object */
>>> + if ((mask >= 1) && (mask <= PCH_RX_OBJ_NUM)) {
>>> + /* 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);
>>> + } else if ((mask > PCH_RX_OBJ_NUM) && (mask <= PCH_OBJ_NUM)) {
>>> + /* Setting CMASK for clearing interrupts for
>>> + frame transmission. */
>>
>> /*
>> * this is the prefered style of multi line comments,
>> * please adjust you comments
>> */
>>
>>> + 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);
>>> + }
>>> +}
>>> +
>>> +static u32 pch_can_get_buffer_status(struct pch_can_priv *priv)
>>> +{
>>> + return (ioread32(&priv->regs->treq1) & 0xffff) |
>>> + ((ioread32(&priv->regs->treq2) & 0xffff) << 16);
>>
>> the second 0xffff is not needed, as the return value is u32 and you shift by 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);
>>> + }
>>> +
>>> + /* 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__);
>>
>> Please use just "debug" level not warning here. Consider to use
>> netdev_dbg() instead. IMHO the __func__ can be dropped and the
>> "official" name for the error is "Error Warning".
>>
>>> + }
>>> + /* 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__);
>>
>> dito
>>
>>> + }
>>> +
>>> + if (status & PCH_LEC_ALL) {
>>> + priv->can.can_stats.bus_error++;
>>> + stats->rx_errors++;
>>> + switch (status & PCH_LEC_ALL) {
>>
>> I suggest to convert to a if-bit-set because there might be more than
>> one bit set.
>
> Marc, what do you mean here. It's an enumeraton. Maybe the following
> code is more clear:
Oh, I haven't looked this one up in the datasheet.
>
> lec = status & PCH_LEC_ALL;
> if (lec > 0) {
or "if (lec)", YMMV
> switch (lec) {
>
>>> + 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;
>
> Could you check what that type of bus error that is? Usually it's a ack
> lost error.
>
>>> + 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;
>>> + }
>>> +
>>> + }
>
> Also, could you please add the TEC and REC:
>
> cf->data[6] = ioread32(&priv->regs->errc) & CAN_TEC;
> cf->data[7] = (ioread32(&priv->regs->errc) & CAN_REC) >> 8;
>
>>> + priv->can.state = state;
>>> + netif_receive_skb(skb);
>>> +
>>> + stats->rx_packets++;
>>> + stats->rx_bytes += cf->can_dlc;
>>> +}
>>> +
>>> +static irqreturn_t pch_can_interrupt(int irq, void *dev_id)
>>> +{
>>> + struct net_device *ndev = (struct net_device *)dev_id;
>>> + struct pch_can_priv *priv = netdev_priv(ndev);
>>> +
>>> + pch_can_set_int_enables(priv, PCH_CAN_NONE);
>>> + napi_schedule(&priv->napi);
>>> +
>>> + return IRQ_HANDLED;
>>> +}
>>> +
>>> +static void pch_fifo_thresh(struct pch_can_priv *priv, int obj_id)
>>> +{
>>> + if (obj_id < PCH_FIFO_THRESH) {
>>> + iowrite32(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, obj_id);
>>> + } else if (obj_id > PCH_FIFO_THRESH) {
>>> + pch_can_int_clr(priv, obj_id);
>>> + } else if (obj_id == PCH_FIFO_THRESH) {
>>> + int cnt;
>>> + for (cnt = 0; cnt < PCH_FIFO_THRESH; cnt++)
>>> + pch_can_int_clr(priv, cnt+1);
>>> + }
>>> +}
>>> +
>>> +static int pch_can_rx_msg_lost(struct net_device *ndev, int obj_id)
>>> +{
>>> + struct pch_can_priv *priv = netdev_priv(ndev);
>>> + struct net_device_stats *stats = &(priv->ndev->stats);
>>> + struct sk_buff *skb;
>>> + struct can_frame *cf;
>>> +
>>> + dev_err(&priv->ndev->dev, "Msg Obj is overwritten.\n");
>
> Please use dev_dbg or even remove the line above.
>
>>> + 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, obj_id);
>
> I think the if busy checks could be improved. Why do you need to wait here?
If I understand the code and datasheet correctly, this function doesn't
only check for busy. The functions sends the message to the object and
waits until it's finished. I suggest to split this functionality into
two functions and give them proper names. In the TX path you usually
don't need the send-message-and-wait-for-completion. In TX you need a
can-I-modify-the-mailbox-registers function and a now-send-the-mailbox
function.
The RX path needs first the waiting-for-free function, then the send and
then again the waiting-for-completion function. But as RX and TX use
always different interfaces the first waiting function can be removed.
>
>>> +
>>> + skb = alloc_can_err_skb(ndev, &cf);
>>> + if (!skb)
>>> + return -ENOMEM;
>>> +
>>> + priv->can.can_stats.error_passive++;
>>> + priv->can.state = CAN_STATE_ERROR_PASSIVE;
>
> Please remove the above two bogus lines.
>
>>> + cf->can_id |= CAN_ERR_CRTL;
>>> + cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
>>> + stats->rx_over_errors++;
>>> + stats->rx_errors++;
>>> +
>>> + netif_receive_skb(skb);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int pch_can_rx_normal(struct net_device *ndev, u32 obj_num, int quota)
>>> +{
>>> + u32 reg;
>>> + canid_t id;
>>> + u32 ide;
>>> + u32 rtr;
>>> + int rcv_pkts = 0;
>>> + int rtn;
>>> + int next_flag = 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, obj_num);
>>> +
>>> + /* Reading the MCONT register. */
>>> + reg = ioread32(&priv->regs->if1_mcont);
>>> + reg &= 0xffff;
>>> +
>>> + for (; (!(reg & CAN_IF_MCONT_EOB)) && (quota > 0);
>>> + obj_num++, next_flag = 0) {
>>> + /* If MsgLost bit set. */
>>> + if (reg & CAN_IF_MCONT_MSGLOST) {
>>> + rtn = pch_can_rx_msg_lost(ndev, obj_num);
>>> + if (!rtn)
>>> + return rtn;
>>> + rcv_pkts++;
>>> + quota--;
>>> + next_flag = 1;
>>> + } else if (!(reg & CAN_IF_MCONT_NEWDAT))
>>> + next_flag = 1;
>>> +
>>
>> after rearanging the code (see below..) you should be able to use a continue here.
>>
>>> + if (!next_flag) {
>>> + skb = alloc_can_skb(priv->ndev, &cf);
>>> + if (!skb)
>>> + return -ENOMEM;
>>> +
>>> + /* Get Received data */
>>> + ide = ((ioread32(&priv->regs->if1_id2)) & CAN_ID2_XTD);
>>> + 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;
>> ^^^^^^^^^^^^^^^^^
>>
>> is the mask needed, you mask the if1_id{1,2} already
>>
>>> + } else {
>>> + id = (((ioread32(&priv->regs->if1_id2)) &
>>> + (CAN_SFF_MASK << 2)) >> 2);
>>> + cf->can_id = (id & CAN_SFF_MASK);
>>
>> one mask can go away
>>
>>> + }
>>> +
>>> + rtr = ioread32(&priv->regs->if1_id2) & CAN_ID2_DIR;
>> ^^
>>
>> remove one space
>>
>>> +
>>> + if (rtr)
>>> + cf->can_id |= CAN_RTR_FLAG;
>>> +
>>> + cf->can_dlc = get_can_dlc((ioread32(&priv->regs->
>>> + if1_mcont)) & 0xF);
>>> + *(u16 *)(cf->data + 0) = ioread16(&priv->regs->
>>> + if1_dataa1);
>>> + *(u16 *)(cf->data + 2) = ioread16(&priv->regs->
>>> + if1_dataa2);
>>> + *(u16 *)(cf->data + 4) = ioread16(&priv->regs->
>>> + if1_datab1);
>>> + *(u16 *)(cf->data + 6) = ioread16(&priv->regs->
>>> + if1_datab2);
>>
>> are you sure, the bytes in the can package a in the correct order.
>> Please test your pch_can against a non pch_can system.
>>
>>> +
>>> + netif_receive_skb(skb);
>>> + rcv_pkts++;
>>> + stats->rx_packets++;
>>> + quota--;
>>> + stats->rx_bytes += cf->can_dlc;
>>> +
>>> + pch_fifo_thresh(priv, obj_num);
>>> + }
>>> +
>>> + /* 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, obj_num + 1);
>>> + reg = ioread32(&priv->regs->if1_mcont);
>>
>> this is almost the same code as before the the loop, can you rearange
>> the code to avoid duplication?
>>
>>> + }
>>> +
>>> + return rcv_pkts;
>>> +}
>>> +
>>> +static void pch_can_tx_complete(struct net_device *ndev, u32 int_stat)
>>> +{
>>> + struct pch_can_priv *priv = netdev_priv(ndev);
>>> + struct net_device_stats *stats = &(priv->ndev->stats);
>>> + unsigned long flags;
>>> + u32 dlc;
>>> +
>>> + 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;
>>
>> use get_can_dlc
>>
>>> + stats->tx_bytes += dlc;
>>> + stats->tx_packets++;
>>> +}
>>> +
>>> +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);
>>> + u32 int_stat;
>>> + int rcv_pkts = 0;
>>> + u32 reg_stat;
>>> + unsigned long flags;
>>> +
>>> + int_stat = pch_can_int_pending(priv);
>>> + if (!int_stat)
>>> + goto END;
>
> Labels should be lowercase as well.
>
>>> +
>>> + if ((int_stat == CAN_STATUS_INT) && (quota > 0)) {
>>> + 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);
>>> + quota--;
>>> + }
>>> + }
>>> +
>>> + 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));
>> ^^^^^^^^^^^^^^^^^^^^^^^^^^^
>>
>> Isn't this "int_stat". Might it be possilbe that regs->intr changes
>> between the pch_can_int_pending and here?
>>
>> What should this transfer do?
>>
>>> + 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 (quota == 0)
>>> + goto END;
>>> +
>>> + 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, quota);
>>> + spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
>>> + quota -= rcv_pkts;
>>> + if (rcv_pkts < 0)
>>
>> how can this happen?
>>
>>> + goto END;
>>> + } else if ((int_stat > PCH_RX_OBJ_NUM) && (int_stat <= PCH_OBJ_NUM)) {
>>> + /* Handle transmission interrupt */
>>> + pch_can_tx_complete(ndev, int_stat);
>>> + }
>>> +
>>> +END:
>>> + 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;
>>> +
>>> + /* Setting the CCE bit for accessing the Can Timing register. */
>>> + pch_can_bit_set(&priv->regs->cont, CAN_CTRL_CCE);
>>> +
>>> + canbit = (bt->brp - 1) & 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 = ((bt->brp - 1) & 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;
>>> +
>>> + /* Regsitering the interrupt. */
>
> Typo!
>
>>> + 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:
>>> + pch_can_release(priv);
>>> +
>>> + return retval;
>>> +}
>>> +
>>> +static int pch_close(struct net_device *ndev)
>>> +{
>>> + struct pch_can_priv *priv = netdev_priv(ndev);
>>> +
>>> + netif_stop_queue(ndev);
>>> + napi_disable(&priv->napi);
>>> + pch_can_release(priv);
>>> + free_irq(priv->dev->irq, ndev);
>>> + close_candev(ndev);
>>> + priv->can.state = CAN_STATE_STOPPED;
>>> + return 0;
>>> +}
>>> +
>>> +static netdev_tx_t pch_xmit(struct sk_buff *skb, struct net_device *ndev)
>>> +{
>>> + 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;
>>
>> What I'm totally missing is the TX flow controll. Your driver has to
>> ensure that the package leave the controller in the order that come
>> into the xmit function. Further you have to stop your xmit queue if
>> you're out of tx objects and reenable if you have a object free.
>>
>> Use netif_stop_queue() and netif_wake_queue() for this.
>>
>>> +
>>> + if (can_dropped_invalid_skb(ndev, skb))
>>> + return NETDEV_TX_OK;
>>> +
>>> + if (priv->tx_obj == (PCH_OBJ_NUM + 1)) { /* Point tail Obj + 1 */
>>> + while (ioread32(&priv->regs->treq2) & 0xfc00)
>>> + udelay(1);
>>
>> please no (possible) infinite delays!
>>
>>> + priv->tx_obj = PCH_RX_OBJ_NUM + 1; /* Point head of Tx Obj ID */
>>> + }
>>
>>> +
>>> + tx_buffer_avail = priv->tx_obj;
>>
>> why has the "object" become a "buffer" now? :)
>>
>>> + priv->tx_obj++;
>>> +
>>> + /* Attaining the lock. */
>>> + spin_lock_irqsave(&priv->msgif_reg_lock, flags);
>>> +
>>> + /* Setting the CMASK register to set value*/
>> ^^^
>>
>> pleas add a whitespace
>>
>>> + iowrite32(CAN_CMASK_RX_TX_SET, &priv->regs->if2_cmask);
>>> +
>>> + /* If ID extended is set. */
>>> + if (cf->can_id & CAN_EFF_FLAG) {
>>> + iowrite32(cf->can_id & 0xffff, &priv->regs->if2_id1);
>>> + iowrite32(((cf->can_id >> 16) & 0x1fff) | CAN_ID2_XTD,
>>> + &priv->regs->if2_id2);
>>> + } else {
>>> + iowrite32(0, &priv->regs->if2_id1);
>>> + iowrite32((cf->can_id & CAN_SFF_MASK) << 2,
>>> + &priv->regs->if2_id2);
>>> + }
>>> +
>>> + pch_can_bit_set(&priv->regs->if2_id2, CAN_ID_MSGVAL);
>>
>> Do you need to do a read-modify-write of the hardware register? Please
>> prepare the values you want to write to hardware, then do it.
>>
>>> +
>>> + /* If remote frame has to be transmitted.. */
>>> + if (!(cf->can_id & CAN_RTR_FLAG))
>>> + pch_can_bit_set(&priv->regs->if2_id2, CAN_ID2_DIR);
>> dito
>>> + /* 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);
>> dito
>>> +
>>> + /* Copy data to register */
>>> + if (cf->can_dlc > 0) {
>>> + u32 data1 = *((u16 *)&cf->data[0]);
>>> + iowrite32(data1, &priv->regs->if2_dataa1);
>>
>> do you think you send the bytes in correct order?
>>
>>> + }
>>> + if (cf->can_dlc > 2) {
>>> + u32 data1 = *((u16 *)&cf->data[2]);
>>> + iowrite32(data1, &priv->regs->if2_dataa2);
>>> + }
>>> + if (cf->can_dlc > 4) {
>>> + u32 data1 = *((u16 *)&cf->data[4]);
>>> + iowrite32(data1, &priv->regs->if2_datab1);
>>> + }
>>> + if (cf->can_dlc > 6) {
>>> + u32 data1 = *((u16 *)&cf->data[6]);
>>> + iowrite32(data1, &priv->regs->if2_datab2);
>>> + }
>
> Could be handled by a loop.
>
>>> + can_put_echo_skb(skb, ndev, tx_buffer_avail - PCH_RX_OBJ_NUM - 1);
>>> +
>>> + /* Set the size of the data. */
>>> + iowrite32(cf->can_dlc, &priv->regs->if2_mcont);
>>> +
>>> + /* Update if2_mcont */
>>> + pch_can_bit_set(&priv->regs->if2_mcont,
>>> + CAN_IF_MCONT_NEWDAT | CAN_IF_MCONT_TXRQXT |
>>> + CAN_IF_MCONT_TXIE);
>>
>> pleae first perpare your value, then write to hardware.
>>
>>> +
>>> + if (tx_buffer_avail == PCH_RX_OBJ_NUM) /* If points tail of FIFO */
>>> + pch_can_bit_set(&priv->regs->if2_mcont, CAN_IF_MCONT_EOB);
>>
>> dito
>>
>> Is EOB relevant for TX objects?
>>
>>> + 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);
>>> + pci_iounmap(pdev, priv->regs);
>>> + if (priv->use_msi)
>>> + pci_disable_msi(priv->dev);
>>> + pci_release_regions(pdev);
>>> + pci_disable_device(pdev);
>>> + pci_set_drvdata(pdev, NULL);
>>> + free_candev(priv->ndev);
>>> +}
>>> +
>>> +#ifdef CONFIG_PM
>>> +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 u32 pch_can_get_int_enables(struct pch_can_priv *priv)
>>> +{
>>> + /* Obtaining the status of IE, SIE and EIE interrupt bits. */
>>> + return (ioread32(&priv->regs->cont) & CAN_CTRL_IE_SIE_EIE) >> 1;
>>> +}
>>> +
>>> +static u32 pch_can_get_rx_enable(struct pch_can_priv *priv, u32 buff_num)
>>> +{
>>> + unsigned long flags;
>>> + u32 enable;
>>> +
>>> + 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 = 1;
>>> + else
>>> + enable = 0;
>>> + spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
>>> + return enable;
>>> +}
>>> +
>>> +static u32 pch_can_get_tx_enable(struct pch_can_priv *priv, u32 buff_num)
>>> +{
>>> + unsigned long flags;
>>> + u32 enable;
>>> +
>>> + 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 = 1;
>>> + } else {
>>> + enable = 0;
>>> + }
>>> + spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
>>> +
>>> + return enable;
>>> +}
>
> The above two functions could be handled by a common one passing "struct
> pch_can_if". See similar comments above.
>
>>> +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 == 1)
>>> + 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 u32 pch_can_get_rx_buffer_link(struct pch_can_priv *priv, u32 buffer_num)
>>> +{
>>> + unsigned long flags;
>>> + u32 link;
>>> +
>>> + 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 = 0;
>>> + else
>>> + link = 1;
>>> + spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
>>> + return link;
>>> +}
>>> +
>>> +static int pch_can_suspend(struct pci_dev *pdev, pm_message_t state)
>>> +{
>>> + int i;
>>> + int retval;
>>> + u32 buf_stat; /* Variable for reading the transmit buffer status. */
>>> + u32 counter = COUNTER_LIMIT;
>>> +
>>> + 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_STOPPED;
>>> +
>>> + /* Waiting for all transmission to complete. */
>>> + while (counter) {
>>> + buf_stat = pch_can_get_buffer_status(priv);
>>> + if (!buf_stat)
>>> + break;
>>> + counter--;
>>> + udelay(1);
>>> + }
>>> + if (!counter)
>>> + dev_err(&pdev->dev, "%s -> Transmission time out.\n", __func__);
>>> +
>>> + /* Save interrupt configuration and then disable them */
>>> + priv->int_enables = pch_can_get_int_enables(priv);
>>> + pch_can_set_int_enables(priv, PCH_CAN_DISABLE);
>>> +
>>> + /* Save Tx buffer enable state */
>>> + for (i = PCH_RX_OBJ_NUM + 1; i <= PCH_OBJ_NUM; i++)
>>> + priv->tx_enable[i] = pch_can_get_tx_enable(priv, i);
>>> +
>>> + /* Disable all Transmit buffers */
>>> + pch_can_tx_disable_all(priv);
>>> +
>>> + /* Save Rx buffer enable state */
>>> + for (i = 1; i <= PCH_RX_OBJ_NUM; i++) {
>>> + priv->rx_enable[i] = pch_can_get_rx_enable(priv, i);
>>> + priv->rx_link[i] = pch_can_get_rx_buffer_link(priv, 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;
>>> + int retval;
>>> + 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 = 1; i <= PCH_RX_OBJ_NUM; i++)
>>> + pch_can_set_tx_enable(priv, i, priv->tx_enable[i]);
>>> +
>>> + /* Configuring the receive buffer and enabling them. */
>>> + for (i = PCH_RX_OBJ_NUM + 1; i <= PCH_OBJ_NUM; i++) {
>>> + /* Restore buffer link */
>>> + pch_can_set_rx_buffer_link(priv, i, priv->rx_link[i]);
>>> +
>>> + /* Restore buffer enables */
>>> + pch_can_set_rx_enable(priv, i, 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;
>>> + 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;
>
> I'm missing CAN_CTRLMODE_3_SAMPLES here?
>
>>> + 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 */
>>> +
>>> + netif_napi_add(ndev, &priv->napi, pch_can_rx_poll, PCH_RX_OBJ_NUM);
>>> +
>>> + rc = pci_enable_msi(priv->dev);
>>> + if (rc) {
>>> + 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;
>>> + }
>>> +
>>> + 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("Intel EG20T PCH CAN(Controller Area Network) Driver");
>>> +MODULE_LICENSE("GPL v2");
>>> +MODULE_VERSION("0.94");
>
> As the driver has already been merged. Please provide incremental
> patches against the net-2.6 branch. Also, it would be nice if you could
> check in-order transmission and reception, e.g., with the can-utils
> program canfdtest:
>
> http://svn.berlios.de/wsvn/socketcan/trunk/can-utils/canfdtest.c
>
> Thanks,
>
> Wolfgang.
> --
> To unsubscribe from this list: send the line "unsubscribe netdev" in
> the body of a message to [email protected]
> More majordomo info at http://vger.kernel.org/majordomo-info.html
cheers, Marc
--
Pengutronix e.K. | Marc Kleine-Budde |
Industrial Linux Solutions | Phone: +49-231-2826-924 |
Vertretung West/Dortmund | Fax: +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de |
On 11/01/2010 12:05 PM, Marc Kleine-Budde wrote:
> Hello,
>
> On 10/29/2010 09:32 PM, Wolfgang Grandegger wrote:
>
> some comments inline.
>
> [...]
...
>>>> + if (status & PCH_LEC_ALL) {
>>>> + priv->can.can_stats.bus_error++;
>>>> + stats->rx_errors++;
>>>> + switch (status & PCH_LEC_ALL) {
>>>
>>> I suggest to convert to a if-bit-set because there might be more than
>>> one bit set.
>>
>> Marc, what do you mean here. It's an enumeraton. Maybe the following
>> code is more clear:
>
> Oh, I haven't looked this one up in the datasheet.
>>
>> lec = status & PCH_LEC_ALL;
>> if (lec > 0) {
>
> or "if (lec)", YMMV
>
>> switch (lec) {
>>
>>>> + 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;
>>
>> Could you check what that type of bus error that is? Usually it's a ack
>> lost error.
>>
>>>> + 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;
>>>> + }
>>>> +
>>>> + }
At a closer look, I doubt that the above LEC handling is correct.
According to the manual: "when the LEC shows the value ?7,? this value
was written to the LEC by the CPU; thus, no CAN bus event was detected"
Therefore the LEC bits should be properly *initialized* and *reset* to
0x7, which I do not find in the code.
Wolfgang.