Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753296Ab0LMGZ1 (ORCPT ); Mon, 13 Dec 2010 01:25:27 -0500 Received: from sm-d311v.smileserver.ne.jp ([203.211.202.206]:24402 "EHLO sm-d311v.smileserver.ne.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752111Ab0LMGWB (ORCPT ); Mon, 13 Dec 2010 01:22:01 -0500 From: Tomoya MORINAGA To: wg@grandegger.com, w.sang@pengutronix.de, chripell@fsfe.org, 21cnbao@gmail.com, sameo@linux.intel.com, socketcan-core@lists.berlios.de, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, davem@davemloft.net Cc: qi.wang@intel.com, yong.y.wang@intel.com, andrew.chih.howe.khor@intel.com, joel.clark@intel.com, kok.howg.ewe@intel.com, margie.foster@intel.com, Tomoya MORINAGA Subject: [PATCH net-next-2.6 v9 08/20] pch_can: Reduce register access Date: Mon, 13 Dec 2010 15:24:14 +0900 Message-Id: <1292221467-8039-8-git-send-email-tomoya-linux@dsn.okisemi.com> X-Mailer: git-send-email 1.6.0.6 In-Reply-To: <1292221467-8039-7-git-send-email-tomoya-linux@dsn.okisemi.com> References: <1292221467-8039-1-git-send-email-tomoya-linux@dsn.okisemi.com> <1292221467-8039-2-git-send-email-tomoya-linux@dsn.okisemi.com> <1292221467-8039-3-git-send-email-tomoya-linux@dsn.okisemi.com> <1292221467-8039-4-git-send-email-tomoya-linux@dsn.okisemi.com> <1292221467-8039-5-git-send-email-tomoya-linux@dsn.okisemi.com> <1292221467-8039-6-git-send-email-tomoya-linux@dsn.okisemi.com> <1292221467-8039-7-git-send-email-tomoya-linux@dsn.okisemi.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5390 Lines: 144 For improve tx/rx speed, reduce register access. Signed-off-by: Tomoya MORINAGA --- drivers/net/can/pch_can.c | 55 +++++++++++++++++--------------------------- 1 files changed, 21 insertions(+), 34 deletions(-) diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c index c6c0842..0acc877 100644 --- a/drivers/net/can/pch_can.c +++ b/drivers/net/can/pch_can.c @@ -372,9 +372,6 @@ static void pch_can_config_rx_tx_buffers(struct pch_can_priv *priv) pch_can_bit_set(&priv->regs->ifregs[0].mcont, PCH_IF_MCONT_UMASK); - /* Set FIFO mode set to 0 except last Rx Obj*/ - pch_can_bit_clear(&priv->regs->ifregs[0].mcont, - PCH_IF_MCONT_EOB); /* In case FIFO mode, Last EoB of Rx Obj must be 1 */ if (i == PCH_RX_OBJ_END) pch_can_bit_set(&priv->regs->ifregs[0].mcont, @@ -402,14 +399,11 @@ static void pch_can_config_rx_tx_buffers(struct pch_can_priv *priv) /* Resetting DIR bit for reception */ iowrite32(0x0, &priv->regs->ifregs[1].id1); - iowrite32(0x0, &priv->regs->ifregs[1].id2); - pch_can_bit_set(&priv->regs->ifregs[1].id2, PCH_ID2_DIR); + iowrite32(PCH_ID2_DIR, &priv->regs->ifregs[1].id2); /* Setting EOB bit for transmitter */ - iowrite32(PCH_IF_MCONT_EOB, &priv->regs->ifregs[1].mcont); - - pch_can_bit_set(&priv->regs->ifregs[1].mcont, - PCH_IF_MCONT_UMASK); + iowrite32(PCH_IF_MCONT_EOB | PCH_IF_MCONT_UMASK, + &priv->regs->ifregs[1].mcont); iowrite32(0, &priv->regs->ifregs[1].mask1); pch_can_bit_clear(&priv->regs->ifregs[1].mask2, 0x1fff); @@ -524,12 +518,12 @@ static void pch_can_error(struct net_device *ndev, u32 status) dev_err(&ndev->dev, "%s -> Bus Off occurres.\n", __func__); } + errc = ioread32(&priv->regs->errc); /* 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 & PCH_REC) >> 8) > 96) cf->data[1] |= CAN_ERR_CRTL_RX_WARNING; if ((errc & PCH_TEC) > 96) @@ -542,7 +536,6 @@ static void pch_can_error(struct net_device *ndev, u32 status) priv->can.can_stats.error_passive++; state = CAN_STATE_ERROR_PASSIVE; cf->can_id |= CAN_ERR_CRTL; - errc = ioread32(&priv->regs->errc); if (((errc & PCH_REC) >> 8) > 127) cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE; if ((errc & PCH_TEC) > 127) @@ -927,6 +920,7 @@ static netdev_tx_t pch_xmit(struct sk_buff *skb, struct net_device *ndev) struct can_frame *cf = (struct can_frame *)skb->data; int tx_obj_no; int i; + u32 id2; if (can_dropped_invalid_skb(ndev, skb)) return NETDEV_TX_OK; @@ -950,22 +944,23 @@ static netdev_tx_t pch_xmit(struct sk_buff *skb, struct net_device *ndev) pch_can_bit_set(&priv->regs->ifregs[1].cmask, PCH_CMASK_ALL); /* If ID extended is set. */ - pch_can_bit_clear(&priv->regs->ifregs[1].id1, 0xffff); - pch_can_bit_clear(&priv->regs->ifregs[1].id2, 0x1fff | PCH_ID2_XTD); if (cf->can_id & CAN_EFF_FLAG) { - pch_can_bit_set(&priv->regs->ifregs[1].id1, - cf->can_id & 0xffff); - pch_can_bit_set(&priv->regs->ifregs[1].id2, - ((cf->can_id >> 16) & 0x1fff) | PCH_ID2_XTD); + iowrite32(cf->can_id & 0xffff, &priv->regs->ifregs[1].id1); + id2 = ((cf->can_id >> 16) & 0x1fff) | PCH_ID2_XTD; } else { - pch_can_bit_set(&priv->regs->ifregs[1].id1, 0); - pch_can_bit_set(&priv->regs->ifregs[1].id2, - (cf->can_id & CAN_SFF_MASK) << 2); + iowrite32(0, &priv->regs->ifregs[1].id1); + id2 = (cf->can_id & CAN_SFF_MASK) << 2; } + id2 |= PCH_ID_MSGVAL; + /* If remote frame has to be transmitted.. */ if (cf->can_id & CAN_RTR_FLAG) - pch_can_bit_clear(&priv->regs->ifregs[1].id2, PCH_ID2_DIR); + id2 &= ~PCH_ID2_DIR; + else + id2 |= PCH_ID2_DIR; + + iowrite32(id2, &priv->regs->ifregs[1].id2); /* Copy data to register */ for (i = 0; i < cf->can_dlc; i += 2) { @@ -976,17 +971,8 @@ static netdev_tx_t pch_xmit(struct sk_buff *skb, struct net_device *ndev) can_put_echo_skb(skb, ndev, tx_obj_no - PCH_RX_OBJ_END - 1); /* Updating the size of the data. */ - pch_can_bit_clear(&priv->regs->ifregs[1].mcont, 0x0f); - pch_can_bit_set(&priv->regs->ifregs[1].mcont, cf->can_dlc); - - /* Clearing IntPend, NewDat & TxRqst */ - pch_can_bit_clear(&priv->regs->ifregs[1].mcont, - PCH_IF_MCONT_NEWDAT | PCH_IF_MCONT_INTPND | - PCH_IF_MCONT_TXRQXT); - - /* Setting NewDat, TxRqst bits */ - pch_can_bit_set(&priv->regs->ifregs[1].mcont, - PCH_IF_MCONT_NEWDAT | PCH_IF_MCONT_TXRQXT); + iowrite32(cf->can_dlc | PCH_IF_MCONT_NEWDAT | PCH_IF_MCONT_TXRQXT | + PCH_IF_MCONT_TXIE, &priv->regs->ifregs[1].mcont); pch_can_rw_msg_obj(&priv->regs->ifregs[1].creq, tx_obj_no); @@ -1211,9 +1197,10 @@ 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); + u32 errc = ioread32(&priv->regs->errc); - bec->txerr = ioread32(&priv->regs->errc) & PCH_TEC; - bec->rxerr = (ioread32(&priv->regs->errc) & PCH_REC) >> 8; + bec->txerr = errc & PCH_TEC; + bec->rxerr = (errc & PCH_REC) >> 8; return 0; } -- 1.6.0.6 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/