Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754164Ab0KOJhq (ORCPT ); Mon, 15 Nov 2010 04:37:46 -0500 Received: from metis.ext.pengutronix.de ([92.198.50.35]:55325 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753419Ab0KOJhp (ORCPT ); Mon, 15 Nov 2010 04:37:45 -0500 Message-ID: <4CE0FF5A.3000100@pengutronix.de> Date: Mon, 15 Nov 2010 10:37:30 +0100 From: Marc Kleine-Budde Organization: Pengutronix User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.15) Gecko/20101027 Thunderbird/3.0.10 MIME-Version: 1.0 To: Tomoya MORINAGA CC: Wolfgang Grandegger , "David S. Miller" , Wolfram Sang , Christian Pellegrin , Barry Song <21cnbao@gmail.com>, Samuel Ortiz , socketcan-core@lists.berlios.de, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, andrew.chih.howe.khor@intel.com, qi.wang@intel.com, margie.foster@intel.com, yong.y.wang@intel.com, Masayuki Ohtake , kok.howg.ewe@intel.com, joel.clark@intel.com Subject: Re: [PATCH net-next-2.6 v2] can: Topcliff: PCH_CAN driver: Add Flow control, References: <4CE0EFA7.9020007@dsn.okisemi.com> In-Reply-To: <4CE0EFA7.9020007@dsn.okisemi.com> X-Enigmail-Version: 1.0.1 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig9C61BF3E9DD6C4869BDFDE8F" X-SA-Exim-Connect-IP: 2001:6f8:1178:4:5054:ff:fe8d:eefb X-SA-Exim-Mail-From: mkl@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 65044 Lines: 1984 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig9C61BF3E9DD6C4869BDFDE8F Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On 11/15/2010 09:30 AM, Tomoya MORINAGA wrote: > * Add Flow control > * Fix Data copy issue (endianness) > * Add Macro prefix "PCH_" > * Separate interface register structure > * Some functions are unified. > * Change MessageObject indication(PCH_RX_OBJ_START, etc..) > * Enumerate LEC macro > * Move MSI processing from open/close to probe/remove processing > * Use BIT(x) > * and more... >=20 > Signed-off-by: Tomoya MORINAGA > --- > drivers/net/can/pch_can.c | 1348 ++++++++++++++++++++-----------------= -------- > 1 files changed, 595 insertions(+), 753 deletions(-) >=20 > diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c > index 6727182..6a38593 100644 > --- a/drivers/net/can/pch_can.c > +++ b/drivers/net/can/pch_can.c > @@ -1,6 +1,6 @@ > /* > * Copyright (C) 1999 - 2010 Intel Corporation. > - * Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD. > + * Copyright (C) 2010 OKI SEMICONDUCTOR CO., LTD. > * > * This program is free software; you can redistribute it and/or modif= y > * it under the terms of the GNU General Public License as published b= y > @@ -32,106 +32,109 @@ > #include > #include > =20 > -#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) > +#define PCH_CTRL_INIT BIT(0) /* The INIT bit of CANCONT register. */ > +#define PCH_CTRL_IE BIT(1) /* The IE bit of CAN control register */ > +#define PCH_CTRL_IE_SIE_EIE (BIT(3) | BIT(2) | BIT(1)) > +#define PCH_CTRL_CCE BIT(6) > +#define PCH_CTRL_OPT BIT(7) /* The OPT bit of CANCONT register. */ > +#define PCH_OPT_SILENT BIT(3) /* The Silent bit of CANOPT reg. */ > +#define PCH_OPT_LBACK BIT(4) /* The LoopBack bit of CANOPT reg. */ > + > +#define PCH_CMASK_RX_TX_SET 0x00f3 > +#define PCH_CMASK_RX_TX_GET 0x0073 > +#define PCH_CMASK_ALL 0xff > +#define PCH_CMASK_NEWDAT BIT(2) > +#define PCH_CMASK_CLRINTPND BIT(3) > +#define PCH_CMASK_CTRL BIT(4) > +#define PCH_CMASK_ARB BIT(5) > +#define PCH_CMASK_MASK BIT(6) > +#define PCH_CMASK_RDWR BIT(7) > +#define PCH_IF_MCONT_NEWDAT BIT(15) > +#define PCH_IF_MCONT_MSGLOST BIT(14) > +#define PCH_IF_MCONT_INTPND BIT(13) > +#define PCH_IF_MCONT_UMASK BIT(12) > +#define PCH_IF_MCONT_TXIE BIT(11) > +#define PCH_IF_MCONT_RXIE BIT(10) > +#define PCH_IF_MCONT_RMTEN BIT(9) > +#define PCH_IF_MCONT_TXRQXT BIT(8) > +#define PCH_IF_MCONT_EOB BIT(7) > +#define PCH_IF_MCONT_DLC (BIT(0) | BIT(1) | BIT(2) | BIT(3)) > +#define PCH_MASK2_MDIR_MXTD (BIT(14) | BIT(15)) > +#define PCH_ID2_DIR BIT(13) > +#define PCH_ID2_XTD BIT(14) > +#define PCH_ID_MSGVAL BIT(15) > +#define PCH_IF_CREQ_BUSY BIT(15) > + > +#define PCH_STATUS_INT 0x8000 > +#define PCH_REC 0x00007f00 > +#define PCH_TEC 0x000000ff > + > +#define PCH_TX_OK BIT(3) > +#define PCH_RX_OK BIT(4) > +#define PCH_EPASSIV BIT(5) > +#define PCH_EWARN BIT(6) > +#define PCH_BUS_OFF BIT(7) > =20 > /* 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. > +#define PCH_BIT_BRP_SHIFT 0 > +#define PCH_BIT_SJW_SHIFT 6 > +#define PCH_BIT_TSEG1_SHIFT 8 > +#define PCH_BIT_TSEG2_SHIFT 12 > +#define PCH_BIT_IF1_MCONT_RXIE_SHIFT 10 > +#define PCH_BIT_IF2_MCONT_TXIE_SHIFT 11 > +#define PCH_BIT_BRPE_BRPE_SHIFT 6 > + > +#define PCH_MSK_BITT_BRP 0x3f > +#define PCH_MSK_BRPE_BRPE 0x3c0 > +#define PCH_MSK_CTRL_IE_SIE_EIE 0x07 > +#define PCH_COUNTER_LIMIT 10 > + > +#define PCH_RX_IFREG 0 > +#define PCH_TX_IFREG 1 > + > +#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*/ I would keep these two and use them to define the PCH_xx_OBJ_END... > -#define PCH_OBJ_NUM (PCH_TX_OBJ_NUM + PCH_RX_OBJ_NUM) > + * The Message RAM consists of 32 message objects. > + */ > +#define PCH_RX_OBJ_START 1 > +#define PCH_RX_OBJ_END 26 > +#define PCH_TX_OBJ_START 27 ^^ Which is (PCH_RX_OBJ_END + 1) > +#define PCH_TX_OBJ_END 32 > =20 > #define PCH_FIFO_THRESH 16 > =20 > +enum pch_can_err { > + PCH_STUF_ERR =3D 1, > + PCH_FORM_ERR, > + PCH_ACK_ERR, > + PCH_BIT1_ERR, > + PCH_BIT0_ERR, > + PCH_CRC_ERR, > + PCH_LEC_ALL, > +}; > + > enum pch_can_mode { > PCH_CAN_ENABLE, > PCH_CAN_DISABLE, > PCH_CAN_ALL, > PCH_CAN_NONE, > PCH_CAN_STOP, > - PCH_CAN_RUN > + PCH_CAN_RUN, > +}; > + > +struct pch_can_if_regs { > + u32 creq; > + u32 cmask; > + u32 mask1; > + u32 mask2; > + u32 id1; > + u32 id2; > + u32 mcont; > + u32 data[4]; > + u32 rsv[13]; > }; > =20 > struct pch_can_regs { > @@ -142,61 +145,44 @@ struct pch_can_regs { > 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 reserve; > + struct pch_can_if_regs ifregs[2]; /* [0]=3Dif1 [1]=3Dif2 */ > + u32 reserve1[8]; > u32 treq1; > u32 treq2; > - u32 reserve6[2]; > - u32 reserve7[56]; > - u32 reserve8[3]; > + u32 reserve2[6]; > + u32 data1; > + u32 data2; > + u32 reserve3[6]; > + u32 canipend1; > + u32 canipend2; > + u32 reserve4[6]; > + u32 canmval1; > + u32 canmval2; > + u32 reserve5[37]; > u32 srst; > }; > =20 > 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 tx_enable[PCH_TX_OBJ_END]; > + unsigned int rx_enable[PCH_TX_OBJ_END]; > + unsigned int rx_link[PCH_TX_OBJ_END]; > 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]; > + spinlock_t msgif_reg_lock; /* Message Interface Registers Access Lock= */ ^^^^^^^^^^^^^^^^^^^^^^^^^^ is it still used? > + unsigned int msg_obj[PCH_TX_OBJ_END]; > struct pch_can_regs __iomem *regs; > struct napi_struct napi; > unsigned int tx_obj; /* Point next Tx Obj index */ > unsigned int use_msi; > + unsigned int netif_stop; > }; > =20 > static struct can_bittiming_const pch_can_bittiming_const =3D { > - .name =3D KBUILD_MODNAME, > + .name =3D "pch_can", I do like the KBUILD_MODNAME more than the string. > .tseg1_min =3D 1, > .tseg1_max =3D 16, > .tseg2_min =3D 1, > @@ -228,15 +214,15 @@ static void pch_can_set_run_mode(struct pch_can_p= riv *priv, > { > switch (mode) { > case PCH_CAN_RUN: > - pch_can_bit_clear(&priv->regs->cont, CAN_CTRL_INIT); > + pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_INIT); > break; > =20 > case PCH_CAN_STOP: > - pch_can_bit_set(&priv->regs->cont, CAN_CTRL_INIT); > + pch_can_bit_set(&priv->regs->cont, PCH_CTRL_INIT); > break; > =20 > default: > - dev_err(&priv->ndev->dev, "%s -> Invalid Mode.\n", __func__); > + netdev_err(priv->ndev, "%s -> Invalid Mode.\n", __func__); > break; > } > } > @@ -246,357 +232,184 @@ static void pch_can_set_optmode(struct pch_can_= priv *priv) > u32 reg_val =3D ioread32(&priv->regs->opt); > =20 > if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) > - reg_val |=3D CAN_OPT_SILENT; > + reg_val |=3D PCH_OPT_SILENT; > =20 > if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) > - reg_val |=3D CAN_OPT_LBACK; > + reg_val |=3D PCH_OPT_LBACK; > =20 > - pch_can_bit_set(&priv->regs->cont, CAN_CTRL_OPT); > + pch_can_bit_set(&priv->regs->cont, PCH_CTRL_OPT); > iowrite32(reg_val, &priv->regs->opt); > } > =20 > -static void pch_can_set_int_custom(struct pch_can_priv *priv) > +static void pch_can_rw_msg_obj(void __iomem *creq_addr, u32 num) > { > - /* 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)); > -} > + u32 counter =3D PCH_COUNTER_LIMIT; ^^^ It's a normal variable, just make it an "int". > + u32 ifx_creq; > =20 > -/* This function retrieves interrupt enabled for the CAN device. */ > -static void pch_can_get_int_enables(struct pch_can_priv *priv, u32 *en= ables) > -{ > - /* Obtaining the status of IE, SIE and EIE interrupt bits. */ > - *enables =3D ((ioread32(&priv->regs->cont) & CAN_CTRL_IE_SIE_EIE) >> = 1); > + iowrite32(num, creq_addr); > + while (counter) { > + ifx_creq =3D ioread32(creq_addr) & PCH_IF_CREQ_BUSY; > + if (!ifx_creq) > + break; > + counter--; > + udelay(1); > + } > + if (!counter) > + pr_err("%s:IF1 BUSY Flag is set forever.\n", __func__); > } > =20 > 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); > + pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_IE); > break; > =20 > case PCH_CAN_ALL: > - pch_can_bit_set(&priv->regs->cont, CAN_CTRL_IE_SIE_EIE); > + pch_can_bit_set(&priv->regs->cont, PCH_CTRL_IE_SIE_EIE); > break; > =20 > case PCH_CAN_NONE: > - pch_can_bit_clear(&priv->regs->cont, CAN_CTRL_IE_SIE_EIE); > + pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_IE_SIE_EIE); > break; > =20 > default: > - dev_err(&priv->ndev->dev, "Invalid interrupt number.\n"); > + netdev_err(priv->ndev, "Invalid interrupt number.\n"); > break; > } > } > =20 > -static void pch_can_check_if_busy(u32 __iomem *creq_addr, u32 num) > -{ > - u32 counter =3D COUNTER_LIMIT; > - u32 ifx_creq; > - > - iowrite32(num, creq_addr); > - while (counter) { > - ifx_creq =3D 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 =3D=3D 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 =3D=3D 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 =3D 0; i < PCH_OBJ_NUM; i++) { > - if (priv->msg_obj[i] =3D=3D MSG_OBJ_RX) > - pch_can_set_rx_enable(priv, i + 1, ENABLE); > - } > -} > - > -static void pch_can_rx_disable_all(struct pch_can_priv *priv) > +static void pch_can_set_rxtx(struct pch_can_priv *priv, u32 buff_num, > + u32 set, u32 dir) > { > - int i; > - > - /* Traversing to obtain the object configured as receivers. */ > - for (i =3D 0; i < PCH_OBJ_NUM; i++) { > - if (priv->msg_obj[i] =3D=3D MSG_OBJ_RX) > - pch_can_set_rx_enable(priv, i + 1, DISABLE); > - } > -} > + u32 ie; > =20 > -static void pch_can_set_tx_enable(struct pch_can_priv *priv, u32 buff_= num, > - u32 set) > -{ > - unsigned long flags; > + if (dir) > + ie =3D PCH_IF_MCONT_TXIE; > + else > + ie =3D PCH_IF_MCONT_RXIE; > =20 > - 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); > + iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[dir].cmask); > + pch_can_rw_msg_obj(&priv->regs->ifregs[dir].creq, buff_num); > =20 > /* 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); > + iowrite32(PCH_CMASK_RDWR | PCH_CMASK_ARB | PCH_CMASK_CTRL, > + &priv->regs->ifregs[dir].cmask); > =20 > - if (set =3D=3D ENABLE) { > + if (set) { > /* 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 =3D=3D DISABLE) { > + pch_can_bit_set(&priv->regs->ifregs[dir].mcont, ie); > + pch_can_bit_set(&priv->regs->ifregs[dir].id2, PCH_ID_MSGVAL); > + } else { > /* 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_bit_clear(&priv->regs->ifregs[dir].mcont, ie); > + pch_can_bit_clear(&priv->regs->ifregs[dir].id2, PCH_ID_MSGVAL); > } > =20 > - pch_can_check_if_busy(&priv->regs->if2_creq, buff_num); > - spin_unlock_irqrestore(&priv->msgif_reg_lock, flags); > + pch_can_rw_msg_obj(&priv->regs->ifregs[dir].creq, buff_num); > } > =20 > -static void pch_can_tx_enable_all(struct pch_can_priv *priv) > +static void pch_can_set_rx_all(struct pch_can_priv *priv, u32 set) > { > int i; > =20 > - /* Traversing to obtain the object configured as transmit object. */ > - for (i =3D 0; i < PCH_OBJ_NUM; i++) { > - if (priv->msg_obj[i] =3D=3D MSG_OBJ_TX) > - pch_can_set_tx_enable(priv, i + 1, ENABLE); > - } > + /* Traversing to obtain the object configured as receivers. */ > + for (i =3D PCH_RX_OBJ_START; i <=3D PCH_RX_OBJ_END; i++) > + pch_can_set_rxtx(priv, i, set, PCH_RX_IFREG); > } > =20 > -static void pch_can_tx_disable_all(struct pch_can_priv *priv) > +static void pch_can_set_tx_all(struct pch_can_priv *priv, u32 set) > { > int i; > =20 > - /* Traversing to obtain the object configured as transmit object. */ > - for (i =3D 0; i < PCH_OBJ_NUM; i++) { > - if (priv->msg_obj[i] =3D=3D 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 =3D ENABLE; > - else > - *enable =3D 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 =3D ENABLE; > - } else { > - *enable =3D DISABLE; > - } > - spin_unlock_irqrestore(&priv->msgif_reg_lock, flags); > + /* Traversing to obtain the object configured as receivers. */ > + for (i =3D PCH_TX_OBJ_START; i <=3D PCH_TX_OBJ_END; i++) > + pch_can_set_rxtx(priv, i, set, PCH_TX_IFREG); > } > =20 > -static int pch_can_int_pending(struct pch_can_priv *priv) > +static u32 pch_can_int_pending(struct pch_can_priv *priv) > { > return ioread32(&priv->regs->intr) & 0xffff; > } > =20 > -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 =3D=3D 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) > +static void pch_can_clear_if_buffers(struct pch_can_priv *priv) > { > - 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 =3D DISABLE; > - else > - *link =3D ENABLE; > - spin_unlock_irqrestore(&priv->msgif_reg_lock, flags); > -} > - > -static void pch_can_clear_buffers(struct pch_can_priv *priv) > -{ > - int i; > - > - for (i =3D 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 =3D 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); > + int i; /* Msg Obj ID (1~32) */ > + > + for (i =3D PCH_RX_OBJ_START; i <=3D PCH_TX_OBJ_END; i++) { > + iowrite32(PCH_CMASK_RX_TX_SET, &priv->regs->ifregs[0].cmask); > + iowrite32(0xffff, &priv->regs->ifregs[0].mask1); > + iowrite32(0xffff, &priv->regs->ifregs[0].mask2); > + iowrite32(0x0, &priv->regs->ifregs[0].id1); > + iowrite32(0x0, &priv->regs->ifregs[0].id2); > + iowrite32(0x0, &priv->regs->ifregs[0].mcont); > + iowrite32(0x0, &priv->regs->ifregs[0].data[0]); > + iowrite32(0x0, &priv->regs->ifregs[0].data[1]); > + iowrite32(0x0, &priv->regs->ifregs[0].data[2]); > + iowrite32(0x0, &priv->regs->ifregs[0].data[3]); > + iowrite32(PCH_CMASK_RDWR | PCH_CMASK_MASK | > + PCH_CMASK_ARB | PCH_CMASK_CTRL, > + &priv->regs->ifregs[0].cmask); > + pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, i); > } > } > =20 > 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); > =20 > - for (i =3D 0; i < PCH_OBJ_NUM; i++) { > - if (priv->msg_obj[i] =3D=3D MSG_OBJ_RX) { > - iowrite32(CAN_CMASK_RX_TX_GET, > - &priv->regs->if1_cmask); > - pch_can_check_if_busy(&priv->regs->if1_creq, i+1); > + for (i =3D PCH_RX_OBJ_START; i <=3D PCH_RX_OBJ_END; i++) { > + iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[0].cmask); > + pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, i); > =20 > - iowrite32(0x0, &priv->regs->if1_id1); > - iowrite32(0x0, &priv->regs->if1_id2); > + iowrite32(0x0, &priv->regs->ifregs[0].id1); > + iowrite32(0x0, &priv->regs->ifregs[0].id2); > =20 > - pch_can_bit_set(&priv->regs->if1_mcont, > - CAN_IF_MCONT_UMASK); > + pch_can_bit_set(&priv->regs->ifregs[0].mcont, > + PCH_IF_MCONT_UMASK); > =20 > - /* 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 =3D=3D (PCH_RX_OBJ_NUM - 1)) > - pch_can_bit_set(&priv->regs->if1_mcont, > - CAN_IF_MCONT_EOB); > + if (i =3D=3D PCH_RX_OBJ_END) > + pch_can_bit_set(&priv->regs->ifregs[0].mcont, > + PCH_IF_MCONT_EOB); > + else > + pch_can_bit_clear(&priv->regs->ifregs[0].mcont, > + PCH_IF_MCONT_EOB); > =20 > - iowrite32(0, &priv->regs->if1_mask1); > - pch_can_bit_clear(&priv->regs->if1_mask2, > - 0x1fff | CAN_MASK2_MDIR_MXTD); > + iowrite32(0, &priv->regs->ifregs[0].mask1); > + pch_can_bit_clear(&priv->regs->ifregs[0].mask2, > + 0x1fff | PCH_MASK2_MDIR_MXTD); > =20 > - /* Setting CMASK for writing */ > - iowrite32(CAN_CMASK_RDWR | CAN_CMASK_MASK | > - CAN_CMASK_ARB | CAN_CMASK_CTRL, > - &priv->regs->if1_cmask); > + /* Setting CMASK for writing */ > + iowrite32(PCH_CMASK_RDWR | PCH_CMASK_MASK | PCH_CMASK_ARB | > + PCH_CMASK_CTRL, &priv->regs->ifregs[0].cmask); > =20 > - pch_can_check_if_busy(&priv->regs->if1_creq, i+1); > - } else if (priv->msg_obj[i] =3D=3D MSG_OBJ_TX) { > - iowrite32(CAN_CMASK_RX_TX_GET, > - &priv->regs->if2_cmask); > - pch_can_check_if_busy(&priv->regs->if2_creq, i+1); > + pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, i); > + } > =20 > - /* 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); > + for (i =3D PCH_TX_OBJ_START; i <=3D PCH_TX_OBJ_END; i++) { > + iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[1].cmask); > + pch_can_rw_msg_obj(&priv->regs->ifregs[1].creq, i); > =20 > - /* Setting EOB bit for transmitter */ > - iowrite32(CAN_IF_MCONT_EOB, &priv->regs->if2_mcont); > + /* Resetting DIR bit for reception */ > + iowrite32(0x0, &priv->regs->ifregs[1].id1); > + iowrite32(PCH_ID2_DIR, &priv->regs->ifregs[1].id2); > =20 > - pch_can_bit_set(&priv->regs->if2_mcont, > - CAN_IF_MCONT_UMASK); > + /* Setting EOB bit for transmitter */ > + iowrite32(PCH_IF_MCONT_EOB | PCH_IF_MCONT_UMASK, > + &priv->regs->ifregs[1].mcont); > =20 > - iowrite32(0, &priv->regs->if2_mask1); > - pch_can_bit_clear(&priv->regs->if2_mask2, 0x1fff); > + iowrite32(0, &priv->regs->ifregs[1].mask1); > + pch_can_bit_clear(&priv->regs->ifregs[1].mask2, 0x1fff); > =20 > - /* Setting CMASK for writing */ > - iowrite32(CAN_CMASK_RDWR | CAN_CMASK_MASK | > - CAN_CMASK_ARB | CAN_CMASK_CTRL, > - &priv->regs->if2_cmask); > + /* Setting CMASK for writing */ > + iowrite32(PCH_CMASK_RDWR | PCH_CMASK_MASK | PCH_CMASK_ARB | > + PCH_CMASK_CTRL, &priv->regs->ifregs[1].cmask); > =20 > - pch_can_check_if_busy(&priv->regs->if2_creq, i+1); > - } > + pch_can_rw_msg_obj(&priv->regs->ifregs[1].creq, i); > } > - spin_unlock_irqrestore(&priv->msgif_reg_lock, flags); > } > =20 > static void pch_can_init(struct pch_can_priv *priv) > @@ -605,7 +418,7 @@ static void pch_can_init(struct pch_can_priv *priv)= > pch_can_set_run_mode(priv, PCH_CAN_STOP); > =20 > /* Clearing all the message object buffers. */ > - pch_can_clear_buffers(priv); > + pch_can_clear_if_buffers(priv); > =20 > /* Configuring the respective message object as either rx/tx object. = */ > pch_can_config_rx_tx_buffers(priv); > @@ -623,57 +436,53 @@ static void pch_can_release(struct pch_can_priv *= priv) > pch_can_set_int_enables(priv, PCH_CAN_NONE); > =20 > /* Disabling all the receive object. */ > - pch_can_rx_disable_all(priv); > + pch_can_set_rx_all(priv, 0); > =20 > /* Disabling all the transmit object. */ > - pch_can_tx_disable_all(priv); > + pch_can_set_tx_all(priv, 0); > } > =20 > /* This function clears interrupt(s) from the CAN device. */ > static void pch_can_int_clr(struct pch_can_priv *priv, u32 mask) > { > - if (mask =3D=3D CAN_STATUS_INT) { > - ioread32(&priv->regs->stat); > - return; > - } > - > /* Clear interrupt for transmit object */ > - if (priv->msg_obj[mask - 1] =3D=3D 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] =3D=3D MSG_OBJ_RX) { > + if ((mask >=3D PCH_RX_OBJ_START) && (mask <=3D PCH_RX_OBJ_END)) { > /* Setting CMASK for clearing the reception interrupts. */ > - iowrite32(CAN_CMASK_RDWR | CAN_CMASK_CTRL | CAN_CMASK_ARB, > - &priv->regs->if1_cmask); > + iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL | PCH_CMASK_ARB, > + &priv->regs->ifregs[0].cmask); > =20 > /* Clearing the Dir bit. */ > - pch_can_bit_clear(&priv->regs->if1_id2, CAN_ID2_DIR); > + pch_can_bit_clear(&priv->regs->ifregs[0].id2, PCH_ID2_DIR); > =20 > /* Clearing NewDat & IntPnd */ > - pch_can_bit_clear(&priv->regs->if1_mcont, > - CAN_IF_MCONT_NEWDAT | CAN_IF_MCONT_INTPND); > + pch_can_bit_clear(&priv->regs->ifregs[0].mcont, > + PCH_IF_MCONT_NEWDAT | PCH_IF_MCONT_INTPND); > + > + pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, mask); > + } else if ((mask >=3D PCH_TX_OBJ_START) && (mask <=3D PCH_TX_OBJ_END)= ) { > + /* > + * Setting CMASK for clearing interrupts for frame transmission. > + */ > + iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL | PCH_CMASK_ARB, > + &priv->regs->ifregs[1].cmask); > + > + /* Resetting the ID registers. */ > + pch_can_bit_set(&priv->regs->ifregs[1].id2, > + PCH_ID2_DIR | (0x7ff << 2)); > + iowrite32(0x0, &priv->regs->ifregs[1].id1); > =20 > - pch_can_check_if_busy(&priv->regs->if1_creq, mask); > + /* Claring NewDat, TxRqst & IntPnd */ > + pch_can_bit_clear(&priv->regs->ifregs[1].mcont, > + PCH_IF_MCONT_NEWDAT | PCH_IF_MCONT_INTPND | > + PCH_IF_MCONT_TXRQXT); > + pch_can_rw_msg_obj(&priv->regs->ifregs[1].creq, mask); > } > } > =20 > -static int pch_can_get_buffer_status(struct pch_can_priv *priv) > +static u32 pch_can_get_buffer_status(struct pch_can_priv *priv) > { > return (ioread32(&priv->regs->treq1) & 0xffff) | > - ((ioread32(&priv->regs->treq2) & 0xffff) << 16); > + (ioread32(&priv->regs->treq2) << 16); > } > =20 > static void pch_can_reset(struct pch_can_priv *priv) > @@ -688,7 +497,7 @@ static void pch_can_error(struct net_device *ndev, = u32 status) > struct sk_buff *skb; > struct pch_can_priv *priv =3D netdev_priv(ndev); > struct can_frame *cf; > - u32 errc; > + u32 errc, lec; > struct net_device_stats *stats =3D &(priv->ndev->stats); > enum can_state state =3D priv->can.state; > =20 > @@ -697,13 +506,11 @@ static void pch_can_error(struct net_device *ndev= , u32 status) > return; > =20 > if (status & PCH_BUS_OFF) { > - pch_can_tx_disable_all(priv); > - pch_can_rx_disable_all(priv); > + pch_can_set_tx_all(priv, 0); > + pch_can_set_rx_all(priv, 0); > state =3D CAN_STATE_BUS_OFF; > cf->can_id |=3D 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__); > } > =20 > /* Warning interrupt. */ > @@ -712,11 +519,11 @@ static void pch_can_error(struct net_device *ndev= , u32 status) > priv->can.can_stats.error_warning++; > cf->can_id |=3D CAN_ERR_CRTL; > errc =3D ioread32(&priv->regs->errc); > - if (((errc & CAN_REC) >> 8) > 96) > + if (((errc & PCH_REC) >> 8) > 96) > cf->data[1] |=3D CAN_ERR_CRTL_RX_WARNING; > - if ((errc & CAN_TEC) > 96) > + if ((errc & PCH_TEC) > 96) > cf->data[1] |=3D CAN_ERR_CRTL_TX_WARNING; > - dev_warn(&ndev->dev, > + netdev_dbg(ndev, > "%s -> Error Counter is more than 96.\n", __func__); > } > /* Error passive interrupt. */ > @@ -725,45 +532,52 @@ static void pch_can_error(struct net_device *ndev= , u32 status) > state =3D CAN_STATE_ERROR_PASSIVE; > cf->can_id |=3D CAN_ERR_CRTL; > errc =3D ioread32(&priv->regs->errc); > - if (((errc & CAN_REC) >> 8) > 127) > + if (((errc & PCH_REC) >> 8) > 127) > cf->data[1] |=3D CAN_ERR_CRTL_RX_PASSIVE; > - if ((errc & CAN_TEC) > 127) > + if ((errc & PCH_TEC) > 127) > cf->data[1] |=3D CAN_ERR_CRTL_TX_PASSIVE; > - dev_err(&ndev->dev, > + netdev_dbg(ndev, > "%s -> CAN controller is ERROR PASSIVE .\n", __func__); > } > =20 > - if (status & PCH_LEC_ALL) { > + lec =3D status & PCH_LEC_ALL; > + switch (lec) { > + case PCH_STUF_ERR: > + cf->data[2] |=3D CAN_ERR_PROT_STUFF; > priv->can.can_stats.bus_error++; > stats->rx_errors++; > - switch (status & PCH_LEC_ALL) { > - case PCH_STUF_ERR: > - cf->data[2] |=3D CAN_ERR_PROT_STUFF; > - break; > - case PCH_FORM_ERR: > - cf->data[2] |=3D CAN_ERR_PROT_FORM; > - break; > - case PCH_ACK_ERR: > - cf->data[2] |=3D CAN_ERR_PROT_LOC_ACK | > - CAN_ERR_PROT_LOC_ACK_DEL; > - break; > - case PCH_BIT1_ERR: > - case PCH_BIT0_ERR: > - cf->data[2] |=3D CAN_ERR_PROT_BIT; > - break; > - case PCH_CRC_ERR: > - cf->data[2] |=3D CAN_ERR_PROT_LOC_CRC_SEQ | > - CAN_ERR_PROT_LOC_CRC_DEL; > - break; > - default: > - iowrite32(status | PCH_LEC_ALL, &priv->regs->stat); > - break; > - } > - > + break; > + case PCH_FORM_ERR: > + cf->data[2] |=3D CAN_ERR_PROT_FORM; > + priv->can.can_stats.bus_error++; > + stats->rx_errors++; > + break; > + case PCH_ACK_ERR: > + cf->can_id |=3D CAN_ERR_ACK; > + priv->can.can_stats.bus_error++; > + stats->rx_errors++; > + break; > + case PCH_BIT1_ERR: > + case PCH_BIT0_ERR: > + cf->data[2] |=3D CAN_ERR_PROT_BIT; > + priv->can.can_stats.bus_error++; > + stats->rx_errors++; > + break; > + case PCH_CRC_ERR: > + cf->data[2] |=3D CAN_ERR_PROT_LOC_CRC_SEQ | > + CAN_ERR_PROT_LOC_CRC_DEL; > + priv->can.can_stats.bus_error++; > + stats->rx_errors++; > + break; > + case PCH_LEC_ALL: /* Written by CPU. No error status */ > + break; > } > =20 > + cf->data[6] =3D ioread32(&priv->regs->errc) & PCH_TEC; > + cf->data[7] =3D (ioread32(&priv->regs->errc) & PCH_REC) >> 8; > + > priv->can.state =3D state; > - netif_rx(skb); > + netif_receive_skb(skb); > =20 > stats->rx_packets++; > stats->rx_bytes +=3D cf->can_dlc; > @@ -775,199 +589,214 @@ static irqreturn_t pch_can_interrupt(int irq, v= oid *dev_id) > struct pch_can_priv *priv =3D netdev_priv(ndev); > =20 > pch_can_set_int_enables(priv, PCH_CAN_NONE); > - > napi_schedule(&priv->napi); > =20 > return IRQ_HANDLED; > } > =20 > -static int pch_can_rx_normal(struct net_device *ndev, u32 int_stat) > +static void pch_fifo_thresh(struct pch_can_priv *priv, int obj_id) > +{ > + if (obj_id < PCH_FIFO_THRESH) { > + iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL | > + PCH_CMASK_ARB, &priv->regs->ifregs[0].cmask); > + > + /* Clearing the Dir bit. */ > + pch_can_bit_clear(&priv->regs->ifregs[0].id2, PCH_ID2_DIR); > + > + /* Clearing NewDat & IntPnd */ > + pch_can_bit_clear(&priv->regs->ifregs[0].mcont, > + PCH_IF_MCONT_INTPND); > + pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, obj_id); > + } else if (obj_id > PCH_FIFO_THRESH) { > + pch_can_int_clr(priv, obj_id); > + } else if (obj_id =3D=3D PCH_FIFO_THRESH) { > + int cnt; > + for (cnt =3D 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 =3D netdev_priv(ndev); > + struct net_device_stats *stats =3D &(priv->ndev->stats); > + struct sk_buff *skb; > + struct can_frame *cf; > + > + netdev_dbg(priv->ndev, "Msg Obj is overwritten.\n"); > + pch_can_bit_clear(&priv->regs->ifregs[0].mcont, > + PCH_IF_MCONT_MSGLOST); > + iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL, > + &priv->regs->ifregs[0].cmask); > + pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, obj_id); > + > + skb =3D alloc_can_err_skb(ndev, &cf); > + if (!skb) > + return -ENOMEM; > + > + cf->can_id |=3D CAN_ERR_CRTL; > + cf->data[1] =3D 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 i, j, k; > int rcv_pkts =3D 0; > + int rtn; > + int next_flag =3D 0; > struct sk_buff *skb; > struct can_frame *cf; > struct pch_can_priv *priv =3D netdev_priv(ndev); > struct net_device_stats *stats =3D &(priv->ndev->stats); > + u8 *can_data; > + int i; > =20 > - /* 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); > + do { > + /* Reading the messsage object from the Message RAM */ > + iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[0].cmask); > + pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, obj_num); > =20 > - /* Reading the MCONT register. */ > - reg =3D ioread32(&priv->regs->if1_mcont); > - reg &=3D 0xffff; > + /* Reading the MCONT register. */ > + reg =3D ioread32(&priv->regs->ifregs[0].mcont); > + > + if (reg & PCH_IF_MCONT_EOB) > + break; > =20 > - for (k =3D 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 =3D alloc_can_err_skb(ndev, &cf); > + if (reg & PCH_IF_MCONT_MSGLOST) { > + rtn =3D pch_can_rx_msg_lost(ndev, obj_num); > + if (!rtn) > + return rtn; > + rcv_pkts++; > + quota--; > + next_flag =3D 1; > + } else if (!(reg & PCH_IF_MCONT_NEWDAT)) > + next_flag =3D 1; > + > + if (!next_flag) { > + skb =3D alloc_can_skb(priv->ndev, &cf); > if (!skb) > return -ENOMEM; > =20 > - priv->can.can_stats.error_passive++; > - priv->can.state =3D CAN_STATE_ERROR_PASSIVE; > - cf->can_id |=3D CAN_ERR_CRTL; > - cf->data[1] |=3D CAN_ERR_CRTL_RX_OVERFLOW; > - cf->data[2] |=3D CAN_ERR_PROT_OVERLOAD; > - stats->rx_packets++; > - stats->rx_bytes +=3D cf->can_dlc; > + /* Get Received data */ > + ide =3D ((ioread32(&priv->regs->ifregs[0].id2)) & > + PCH_ID2_XTD); > + if (ide) { > + id =3D (ioread32(&priv->regs->ifregs[0].id1) & > + 0xffff); > + id |=3D (((ioread32(&priv->regs->ifregs[0].id2)) & > + 0x1fff) << 16); > + cf->can_id =3D id | CAN_EFF_FLAG; > + } else { > + id =3D (((ioread32(&priv->regs->ifregs[0].id2)) & > + (CAN_SFF_MASK << 2)) >> 2); > + cf->can_id =3D id; > + } > + > + rtr =3D ioread32(&priv->regs->ifregs[0].id2) & > + PCH_ID2_DIR; Try to minimize the ioread to "id2". I suggest to read id2 only _once_ and use it multiple times. > + > + if (rtr) > + cf->can_id |=3D CAN_RTR_FLAG; > + > + cf->can_dlc =3D get_can_dlc((ioread32(&priv->regs-> > + ifregs[0].mcont)) & 0xF); > + > + can_data =3D (u8 *)&priv->regs->ifregs[0].data[0]; > + for (i =3D 0; i < cf->can_dlc; i +=3D 2, can_data +=3D 4) { > + cf->data[i] =3D ioread8(can_data); > + cf->data[i+1] =3D ioread8(can_data + 1); ^^^ codingstyle: "i + 1", please use checkpatch.pl. > + } Either use ioread8 or ioread16 in both the rx and tx path. > =20 > netif_receive_skb(skb); > rcv_pkts++; > - goto RX_NEXT; > - } > - if (!(reg & CAN_IF_MCONT_NEWDAT)) > - goto RX_NEXT; > - > - skb =3D alloc_can_skb(priv->ndev, &cf); > - if (!skb) > - return -ENOMEM; > - > - /* Get Received data */ > - ide =3D ((ioread32(&priv->regs->if1_id2)) & CAN_ID2_XTD) >> 14; > - if (ide) { > - id =3D (ioread32(&priv->regs->if1_id1) & 0xffff); > - id |=3D (((ioread32(&priv->regs->if1_id2)) & > - 0x1fff) << 16); > - cf->can_id =3D (id & CAN_EFF_MASK) | CAN_EFF_FLAG; > - } else { > - id =3D (((ioread32(&priv->regs->if1_id2)) & > - (CAN_SFF_MASK << 2)) >> 2); > - cf->can_id =3D (id & CAN_SFF_MASK); > - } > + stats->rx_packets++; > + quota--; > + stats->rx_bytes +=3D cf->can_dlc; > =20 > - rtr =3D (ioread32(&priv->regs->if1_id2) & CAN_ID2_DIR); > - if (rtr) { > - cf->can_dlc =3D 0; > - cf->can_id |=3D CAN_RTR_FLAG; > - } else { > - cf->can_dlc =3D ((ioread32(&priv->regs->if1_mcont)) & > - 0x0f); > + pch_fifo_thresh(priv, obj_num); > } > + obj_num++; > + next_flag =3D 0; > + } while (quota > 0); > =20 > - for (i =3D 0, j =3D 0; i < cf->can_dlc; j++) { > - reg =3D ioread32(&priv->regs->if1_dataa1 + j*4); > - cf->data[i++] =3D cpu_to_le32(reg & 0xff); > - if (i =3D=3D cf->can_dlc) > - break; > - cf->data[i++] =3D cpu_to_le32((reg >> 8) & 0xff); > - } > + return rcv_pkts; > +} > =20 > - netif_receive_skb(skb); > - rcv_pkts++; > - stats->rx_packets++; > - stats->rx_bytes +=3D 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 =3D=3D PCH_FIFO_THRESH) { > - int cnt; > - for (cnt =3D 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 =3D ioread32(&priv->regs->if1_mcont); > - } > +static void pch_can_tx_complete(struct net_device *ndev, u32 int_stat)= > +{ > + struct pch_can_priv *priv =3D netdev_priv(ndev); > + struct net_device_stats *stats =3D &(priv->ndev->stats); > + u32 dlc; > =20 > - return rcv_pkts; > + can_get_echo_skb(ndev, int_stat - PCH_RX_OBJ_END - 1); > + iowrite32(PCH_CMASK_RX_TX_GET | PCH_CMASK_CLRINTPND, > + &priv->regs->ifregs[1].cmask); > + dlc =3D get_can_dlc(ioread32(&priv->regs->ifregs[1].mcont) & > + PCH_IF_MCONT_DLC); > + pch_can_rw_msg_obj(&priv->regs->ifregs[1].creq, int_stat); > + stats->tx_bytes +=3D dlc; > + stats->tx_packets++; > + if ((int_stat =3D=3D PCH_TX_OBJ_END) && (priv->netif_stop =3D=3D 1)) = { No need for the netif_stop variable. netif_wake_queue does the check anyw= ay. > + netif_wake_queue(ndev); > + priv->netif_stop =3D 0; > + } > } > + > static int pch_can_rx_poll(struct napi_struct *napi, int quota) > { > struct net_device *ndev =3D napi->dev; > struct pch_can_priv *priv =3D netdev_priv(ndev); > - struct net_device_stats *stats =3D &(priv->ndev->stats); > - u32 dlc; > u32 int_stat; > int rcv_pkts =3D 0; > u32 reg_stat; > - unsigned long flags; > =20 > int_stat =3D pch_can_int_pending(priv); > if (!int_stat) > - return 0; > + goto end; > =20 > -INT_STAT: > - if (int_stat =3D=3D CAN_STATUS_INT) { > + if ((int_stat =3D=3D PCH_STATUS_INT) && (quota > 0)) { > reg_stat =3D ioread32(&priv->regs->stat); > if (reg_stat & (PCH_BUS_OFF | PCH_LEC_ALL)) { > - if ((reg_stat & PCH_LEC_ALL) !=3D PCH_LEC_ALL) > + if ((reg_stat & PCH_LEC_ALL) !=3D PCH_LEC_ALL) { > pch_can_error(ndev, reg_stat); > + quota--; > + } > } > =20 > - 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); > + if (reg_stat & PCH_TX_OK) > pch_can_bit_clear(&priv->regs->stat, PCH_TX_OK); > - } > =20 > if (reg_stat & PCH_RX_OK) > pch_can_bit_clear(&priv->regs->stat, PCH_RX_OK); > =20 > int_stat =3D pch_can_int_pending(priv); > - if (int_stat =3D=3D CAN_STATUS_INT) > - goto INT_STAT; > } > =20 > -MSG_OBJ: > - if ((int_stat >=3D 1) && (int_stat <=3D PCH_RX_OBJ_NUM)) { > - spin_lock_irqsave(&priv->msgif_reg_lock, flags); > - rcv_pkts =3D 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 <=3D PCH_OBJ_NUM)= ) { > - if (priv->msg_obj[int_stat - 1] =3D=3D 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 =3D 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 =3D 8; > - stats->tx_bytes +=3D dlc; > - stats->tx_packets++; > - } > + if (quota =3D=3D 0) > + goto end; > + > + if ((int_stat >=3D PCH_RX_OBJ_START) && (int_stat <=3D PCH_RX_OBJ_END= )) { > + rcv_pkts +=3D pch_can_rx_normal(ndev, int_stat, quota); > + quota -=3D rcv_pkts; > + if (quota < 0) > + goto end; > + } else if ((int_stat >=3D PCH_TX_OBJ_START) && > + (int_stat <=3D PCH_TX_OBJ_END)) { > + /* Handle transmission interrupt */ > + pch_can_tx_complete(ndev, int_stat); > } > =20 > - int_stat =3D pch_can_int_pending(priv); > - if (int_stat =3D=3D CAN_STATUS_INT) > - goto INT_STAT; > - else if (int_stat >=3D 1 && int_stat <=3D 32) > - goto MSG_OBJ; > - > +end: > napi_complete(napi); > pch_can_set_int_enables(priv, PCH_CAN_ALL); > =20 > @@ -980,20 +809,18 @@ static int pch_set_bittiming(struct net_device *n= dev) > const struct can_bittiming *bt =3D &priv->can.bittiming; > u32 canbit; > u32 bepe; > - u32 brp; > =20 > /* Setting the CCE bit for accessing the Can Timing register. */ > - pch_can_bit_set(&priv->regs->cont, CAN_CTRL_CCE); > - > - brp =3D (bt->tq) / (1000000000/PCH_CAN_CLK) - 1; > - canbit =3D brp & MSK_BITT_BRP; > - canbit |=3D (bt->sjw - 1) << BIT_BITT_SJW; > - canbit |=3D (bt->phase_seg1 + bt->prop_seg - 1) << BIT_BITT_TSEG1; > - canbit |=3D (bt->phase_seg2 - 1) << BIT_BITT_TSEG2; > - bepe =3D (brp & MSK_BRPE_BRPE) >> BIT_BRPE_BRPE; > + pch_can_bit_set(&priv->regs->cont, PCH_CTRL_CCE); > + > + canbit =3D (bt->brp - 1) & PCH_MSK_BITT_BRP; > + canbit |=3D (bt->sjw - 1) << PCH_BIT_SJW_SHIFT; > + canbit |=3D (bt->phase_seg1 + bt->prop_seg - 1) << PCH_BIT_TSEG1_SHIF= T; > + canbit |=3D (bt->phase_seg2 - 1) << PCH_BIT_TSEG2_SHIFT; > + bepe =3D ((bt->brp - 1) & PCH_MSK_BRPE_BRPE) >> PCH_BIT_BRPE_BRPE_SHI= FT; > iowrite32(canbit, &priv->regs->bitt); > iowrite32(bepe, &priv->regs->brpe); > - pch_can_bit_clear(&priv->regs->cont, CAN_CTRL_CCE); > + pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_CCE); > =20 > return 0; > } > @@ -1008,8 +835,8 @@ static void pch_can_start(struct net_device *ndev)= > pch_set_bittiming(ndev); > pch_can_set_optmode(priv); > =20 > - pch_can_tx_enable_all(priv); > - pch_can_rx_enable_all(priv); > + pch_can_set_tx_all(priv, 1); > + pch_can_set_rx_all(priv, 1); > =20 > /* Setting the CAN to run mode. */ > pch_can_set_run_mode(priv, PCH_CAN_RUN); > @@ -1041,27 +868,18 @@ static int pch_can_open(struct net_device *ndev)= > struct pch_can_priv *priv =3D netdev_priv(ndev); > int retval; > =20 > - retval =3D pci_enable_msi(priv->dev); > - if (retval) { > - dev_info(&ndev->dev, "PCH CAN opened without MSI\n"); > - priv->use_msi =3D 0; > - } else { > - dev_info(&ndev->dev, "PCH CAN opened with MSI\n"); > - priv->use_msi =3D 1; > - } > - > - /* Regsitering the interrupt. */ > + /* Regstering the interrupt. */ > retval =3D request_irq(priv->dev->irq, pch_can_interrupt, IRQF_SHARED= , > ndev->name, ndev); > if (retval) { > - dev_err(&ndev->dev, "request_irq failed.\n"); > + netdev_err(ndev, "request_irq failed.\n"); > goto req_irq_err; > } > =20 > /* Open common can device */ > retval =3D open_candev(ndev); > if (retval) { > - dev_err(ndev->dev.parent, "open_candev() failed %d\n", retval); > + netdev_err(ndev, "open_candev() failed %d\n", retval); > goto err_open_candev; > } > =20 > @@ -1075,9 +893,6 @@ static int pch_can_open(struct net_device *ndev) > 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); > =20 > return retval; > @@ -1091,102 +906,70 @@ static int pch_close(struct net_device *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 =3D CAN_STATE_STOPPED; > return 0; > } > =20 > -static int pch_get_msg_obj_sts(struct net_device *ndev, u32 obj_id) > -{ > - u32 buffer_status =3D 0; > - struct pch_can_priv *priv =3D netdev_priv(ndev); > - > - /* Getting the message object status. */ > - buffer_status =3D (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 *nd= ev) > { > - int i, j; > - unsigned long flags; > struct pch_can_priv *priv =3D netdev_priv(ndev); > struct can_frame *cf =3D (struct can_frame *)skb->data; > - int tx_buffer_avail =3D 0; > + int tx_obj_no =3D 0; > + int i; > =20 > if (can_dropped_invalid_skb(ndev, skb)) > return NETDEV_TX_OK; > =20 > - if (priv->tx_obj =3D=3D (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 =3D PCH_RX_OBJ_NUM + 1; /* Point head of Tx Obj ID */ > - tx_buffer_avail =3D priv->tx_obj; /* Point Tail of Tx Obj */ > + if (priv->tx_obj =3D=3D PCH_TX_OBJ_END) { > + if (ioread32(&priv->regs->treq2) & 0xfc00) { what does this if check? > + netif_stop_queue(ndev); > + priv->netif_stop =3D 1; > + } > + tx_obj_no =3D priv->tx_obj; > + priv->tx_obj =3D PCH_TX_OBJ_START; > } else { > - tx_buffer_avail =3D priv->tx_obj; > + tx_obj_no =3D priv->tx_obj; > + 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); > =20 > - /* Setting the CMASK register. */ > - pch_can_bit_set(&priv->regs->if2_cmask, CAN_CMASK_ALL); > + /* Setting the CMASK register to set value */ > + iowrite32(PCH_CMASK_RX_TX_SET, &priv->regs->ifregs[1].cmask); > =20 > /* 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); > + iowrite32(cf->can_id & 0xffff, &priv->regs->ifregs[1].id1); > + iowrite32(((cf->can_id >> 16) & 0x1fff) | PCH_ID2_XTD, > + &priv->regs->ifregs[1].id2); > } 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); > + iowrite32(0, &priv->regs->ifregs[1].id1); > + iowrite32((cf->can_id & CAN_SFF_MASK) << 2, > + &priv->regs->ifregs[1].id2); > } > =20 > + pch_can_bit_set(&priv->regs->ifregs[1].id2, PCH_ID_MSGVAL); Please don't read-modify-write the id2 register. Prepare the value for id2, then write it to hardware! > + > + /* If remote frame has to be transmitted.. */ > + if (!(cf->can_id & CAN_RTR_FLAG)) > + pch_can_bit_set(&priv->regs->ifregs[1].id2, PCH_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); > + pch_can_bit_clear(&priv->regs->ifregs[1].id2, PCH_ID2_DIR); dito > =20 > - for (i =3D 0, j =3D 0; i < cf->can_dlc; j++) { > - iowrite32(le32_to_cpu(cf->data[i++]), > - (&priv->regs->if2_dataa1) + j*4); > - if (i =3D=3D cf->can_dlc) > - break; > - iowrite32(le32_to_cpu(cf->data[i++] << 8), > - (&priv->regs->if2_dataa1) + j*4); > + /* Copy data to register */ > + for (i =3D 0; i < cf->can_dlc; i +=3D 2) { > + iowrite16(cf->data[i] | (cf->data[i+1] << 8), ^^^ > + &priv->regs->ifregs[1].data[i/2]); ^^^ codingstyle > } > =20 > - can_put_echo_skb(skb, ndev, tx_buffer_avail - PCH_RX_OBJ_NUM - 1); > + can_put_echo_skb(skb, ndev, tx_obj_no - PCH_RX_OBJ_END - 1); > =20 > - /* 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); > + /* Set the size of the data. Update if2_mcont*/ > + iowrite32(cf->can_dlc | PCH_IF_MCONT_NEWDAT | PCH_IF_MCONT_TXRQXT | > + PCH_IF_MCONT_TXIE, &priv->regs->ifregs[1].mcont); > =20 > - /* 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); > + pch_can_rw_msg_obj(&priv->regs->ifregs[1].creq, tx_obj_no); > =20 > return NETDEV_TX_OK; > } > @@ -1203,21 +986,90 @@ static void __devexit pch_can_remove(struct pci_= dev *pdev) > struct pch_can_priv *priv =3D netdev_priv(ndev); > =20 > unregister_candev(priv->ndev); > - free_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); > pch_can_reset(priv); > + free_candev(priv->ndev); > } > =20 > #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, PCH_CTRL_IE_SIE_EIE); > + > + /* Appropriately setting them. */ > + pch_can_bit_set(&priv->regs->cont, > + ((priv->int_enables & PCH_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) & PCH_CTRL_IE_SIE_EIE) >> 1; > +} > + > +static u32 pch_can_get_rxtx_ir(struct pch_can_priv *priv, u32 buff_num= , u32 dir) > +{ > + u32 ie, enable; > + > + if (dir) > + ie =3D PCH_IF_MCONT_RXIE; > + else > + ie =3D PCH_IF_MCONT_TXIE; > + > + iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[dir].cmask); > + pch_can_rw_msg_obj(&priv->regs->ifregs[dir].creq, buff_num); > + > + if (((ioread32(&priv->regs->ifregs[dir].id2)) & PCH_ID_MSGVAL) && > + ((ioread32(&priv->regs->ifregs[dir].mcont)) & ie)) > + enable =3D 1; > + else > + enable =3D 0; > + return enable; > +} > + > +static void pch_can_set_rx_buffer_link(struct pch_can_priv *priv, > + u32 buffer_num, u32 set) > +{ > + iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[0].cmask); > + pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, buffer_num); > + iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL, > + &priv->regs->ifregs[0].cmask); > + if (set) > + pch_can_bit_clear(&priv->regs->ifregs[0].mcont, > + PCH_IF_MCONT_EOB); > + else > + pch_can_bit_set(&priv->regs->ifregs[0].mcont, PCH_IF_MCONT_EOB); > + > + pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, buffer_num); > +} > + > +static u32 pch_can_get_rx_buffer_link(struct pch_can_priv *priv, u32 b= uffer_num) > +{ > + u32 link; > + > + iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[0].cmask); > + pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, buffer_num); > + > + if (ioread32(&priv->regs->ifregs[0].mcont) & PCH_IF_MCONT_EOB) > + link =3D 0; > + else > + link =3D 1; > + return link; > +} > + > static int pch_can_suspend(struct pci_dev *pdev, pm_message_t state) > { > - int i; /* Counter variable. */ > - int retval; /* Return value. */ > + int i; > + int retval; > u32 buf_stat; /* Variable for reading the transmit buffer status. */ > - u32 counter =3D 0xFFFFFF; > + u32 counter =3D PCH_COUNTER_LIMIT; > =20 > struct net_device *dev =3D pci_get_drvdata(pdev); > struct pch_can_priv *priv =3D netdev_priv(dev); > @@ -1226,7 +1078,7 @@ static int pch_can_suspend(struct pci_dev *pdev, = pm_message_t state) > pch_can_set_run_mode(priv, PCH_CAN_STOP); > =20 > /* Indicate that we are aboutto/in suspend */ > - priv->can.state =3D CAN_STATE_SLEEPING; > + priv->can.state =3D CAN_STATE_STOPPED; > =20 > /* Waiting for all transmission to complete. */ > while (counter) { > @@ -1240,31 +1092,24 @@ static int pch_can_suspend(struct pci_dev *pdev= , pm_message_t state) > dev_err(&pdev->dev, "%s -> Transmission time out.\n", __func__); > =20 > /* Save interrupt configuration and then disable them */ > - pch_can_get_int_enables(priv, &(priv->int_enables)); > + priv->int_enables =3D pch_can_get_int_enables(priv); > pch_can_set_int_enables(priv, PCH_CAN_DISABLE); > =20 > /* Save Tx buffer enable state */ > - for (i =3D 0; i < PCH_OBJ_NUM; i++) { > - if (priv->msg_obj[i] =3D=3D MSG_OBJ_TX) > - pch_can_get_tx_enable(priv, i + 1, > - &(priv->tx_enable[i])); > - } > + for (i =3D PCH_TX_OBJ_START; i <=3D PCH_TX_OBJ_END; i++) > + priv->tx_enable[i] =3D pch_can_get_rxtx_ir(priv, i, PCH_TX_IFREG); > =20 > /* Disable all Transmit buffers */ > - pch_can_tx_disable_all(priv); > + pch_can_set_tx_all(priv, 0); > =20 > /* Save Rx buffer enable state */ > - for (i =3D 0; i < PCH_OBJ_NUM; i++) { > - if (priv->msg_obj[i] =3D=3D 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])); > - } > + for (i =3D PCH_RX_OBJ_START; i <=3D PCH_RX_OBJ_END; i++) { > + priv->rx_enable[i] =3D pch_can_get_rxtx_ir(priv, i, PCH_RX_IFREG); > + priv->rx_link[i] =3D pch_can_get_rx_buffer_link(priv, i); > } > =20 > /* Disable all Receive buffers */ > - pch_can_rx_disable_all(priv); > + pch_can_set_rx_all(priv, 0); > retval =3D pci_save_state(pdev); > if (retval) { > dev_err(&pdev->dev, "pci_save_state failed.\n"); > @@ -1279,8 +1124,8 @@ static int pch_can_suspend(struct pci_dev *pdev, = pm_message_t state) > =20 > static int pch_can_resume(struct pci_dev *pdev) > { > - int i; /* Counter variable. */ > - int retval; /* Return variable. */ > + int i; > + int retval; > struct net_device *dev =3D pci_get_drvdata(pdev); > struct pch_can_priv *priv =3D netdev_priv(dev); > =20 > @@ -1312,23 +1157,16 @@ static int pch_can_resume(struct pci_dev *pdev)= > pch_can_set_optmode(priv); > =20 > /* Enabling the transmit buffer. */ > - for (i =3D 0; i < PCH_OBJ_NUM; i++) { > - if (priv->msg_obj[i] =3D=3D MSG_OBJ_TX) { > - pch_can_set_tx_enable(priv, i + 1, > - priv->tx_enable[i]); > - } > - } > + for (i =3D PCH_RX_OBJ_START; i <=3D PCH_RX_OBJ_END; i++) > + pch_can_set_rxtx(priv, i, priv->tx_enable[i], PCH_TX_IFREG); > =20 > /* Configuring the receive buffer and enabling them. */ > - for (i =3D 0; i < PCH_OBJ_NUM; i++) { > - if (priv->msg_obj[i] =3D=3D 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]); > - } > + for (i =3D PCH_TX_OBJ_START; i <=3D PCH_TX_OBJ_END; i++) { > + /* Restore buffer link */ > + pch_can_set_rx_buffer_link(priv, i, priv->rx_link[i]); > + > + /* Restore buffer enables */ > + pch_can_set_rxtx(priv, i, priv->rx_enable[i], PCH_RX_IFREG); > } > =20 > /* Enable CAN Interrupts */ > @@ -1349,8 +1187,8 @@ static int pch_can_get_berr_counter(const struct = net_device *dev, > { > struct pch_can_priv *priv =3D netdev_priv(dev); > =20 > - bec->txerr =3D ioread32(&priv->regs->errc) & CAN_TEC; > - bec->rxerr =3D (ioread32(&priv->regs->errc) & CAN_REC) >> 8; > + bec->txerr =3D ioread32(&priv->regs->errc) & PCH_TEC; > + bec->rxerr =3D (ioread32(&priv->regs->errc) & PCH_REC) >> 8; > =20 > return 0; > } > @@ -1361,7 +1199,6 @@ static int __devinit pch_can_probe(struct pci_dev= *pdev, > struct net_device *ndev; > struct pch_can_priv *priv; > int rc; > - int index; > void __iomem *addr; > =20 > rc =3D pci_enable_device(pdev); > @@ -1383,7 +1220,8 @@ static int __devinit pch_can_probe(struct pci_dev= *pdev, > goto probe_exit_ipmap; > } > =20 > - ndev =3D alloc_candev(sizeof(struct pch_can_priv), PCH_TX_OBJ_NUM); ^^^^^^^^^^^^^^ I like that define.... > + ndev =3D alloc_candev(sizeof(struct pch_can_priv), > + PCH_TX_OBJ_END - PCH_TX_OBJ_START + 1); more readable than this ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > if (!ndev) { > rc =3D -ENOMEM; > dev_err(&pdev->dev, "Failed alloc_candev\n"); > @@ -1399,7 +1237,7 @@ static int __devinit pch_can_probe(struct pci_dev= *pdev, > priv->can.do_get_berr_counter =3D pch_can_get_berr_counter; > priv->can.ctrlmode_supported =3D CAN_CTRLMODE_LISTENONLY | > CAN_CTRLMODE_LOOPBACK; > - priv->tx_obj =3D PCH_RX_OBJ_NUM + 1; /* Point head of Tx Obj */ > + priv->tx_obj =3D PCH_TX_OBJ_START; /* Point head of Tx Obj */ > =20 > ndev->irq =3D pdev->irq; > ndev->flags |=3D IFF_ECHO; > @@ -1407,15 +1245,18 @@ static int __devinit pch_can_probe(struct pci_d= ev *pdev, > pci_set_drvdata(pdev, ndev); > SET_NETDEV_DEV(ndev, &pdev->dev); > ndev->netdev_ops =3D &pch_can_netdev_ops; > - > priv->can.clock.freq =3D PCH_CAN_CLK; /* Hz */ > - for (index =3D 0; index < PCH_RX_OBJ_NUM;) > - priv->msg_obj[index++] =3D MSG_OBJ_RX; > =20 > - for (index =3D index; index < PCH_OBJ_NUM;) > - priv->msg_obj[index++] =3D MSG_OBJ_TX; > + netif_napi_add(ndev, &priv->napi, pch_can_rx_poll, PCH_RX_OBJ_END); > =20 > - netif_napi_add(ndev, &priv->napi, pch_can_rx_poll, PCH_RX_OBJ_NUM); > + rc =3D pci_enable_msi(priv->dev); > + if (rc) { > + dev_info(&ndev->dev, "PCH CAN opened without MSI\n"); > + priv->use_msi =3D 0; > + } else { > + dev_info(&ndev->dev, "PCH CAN opened with MSI\n"); > + priv->use_msi =3D 1; > + } > =20 > rc =3D register_candev(ndev); > if (rc) { > @@ -1426,7 +1267,8 @@ static int __devinit pch_can_probe(struct pci_dev= *pdev, > return 0; > =20 > probe_exit_reg_candev: > - free_candev(ndev); > + if (priv->use_msi) > + pci_disable_msi(priv->dev); > probe_exit_alloc_candev: > pci_iounmap(pdev, addr); > probe_exit_ipmap: > @@ -1458,6 +1300,6 @@ static void __exit pch_can_pci_exit(void) > } > module_exit(pch_can_pci_exit); > =20 > -MODULE_DESCRIPTION("Controller Area Network Driver"); > +MODULE_DESCRIPTION("Intel EG20T PCH CAN(Controller Area Network) Drive= r"); > MODULE_LICENSE("GPL v2"); > MODULE_VERSION("0.94"); cheers, Marc --=20 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 | --------------enig9C61BF3E9DD6C4869BDFDE8F Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; 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