forked from luck/tmp_suning_uos_patched
can: EG20T PCH: Delete unnecessary spin_lock
Delete unnecessary spin_lock for accessing Message Object. Since all message objects are divided into tx/rx area completely, spin_lock processing is unnecessary. Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com> Acked-by: Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tomoya
David S. Miller
parent
d68f6837c4
commit
2989042ca8
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@ -71,7 +71,6 @@
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#define PCH_REC 0x00007f00
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#define PCH_TEC 0x000000ff
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#define PCH_TX_OK BIT(3)
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#define PCH_RX_OK BIT(4)
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#define PCH_EPASSIV BIT(5)
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@ -178,7 +177,6 @@ struct pch_can_priv {
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unsigned int int_enables;
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unsigned int int_stat;
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struct net_device *ndev;
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spinlock_t msgif_reg_lock; /* Message Interface Registers Access Lock*/
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unsigned int msg_obj[PCH_TX_OBJ_END];
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struct pch_can_regs __iomem *regs;
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struct napi_struct napi;
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@ -309,7 +307,6 @@ static void pch_can_check_if_busy(u32 __iomem *creq_addr, u32 num)
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static void pch_can_set_rxtx(struct pch_can_priv *priv, u32 buff_num,
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u32 set, enum pch_ifreg dir)
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{
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unsigned long flags;
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u32 ie;
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if (dir)
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@ -317,7 +314,6 @@ static void pch_can_set_rxtx(struct pch_can_priv *priv, u32 buff_num,
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else
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ie = PCH_IF_MCONT_RXIE;
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spin_lock_irqsave(&priv->msgif_reg_lock, flags);
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/* Reading the receive buffer data from RAM to Interface1 registers */
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iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[dir].cmask);
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pch_can_check_if_busy(&priv->regs->ifregs[dir].creq, buff_num);
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@ -338,10 +334,8 @@ static void pch_can_set_rxtx(struct pch_can_priv *priv, u32 buff_num,
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}
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pch_can_check_if_busy(&priv->regs->ifregs[dir].creq, buff_num);
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spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
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}
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static void pch_can_set_rx_all(struct pch_can_priv *priv, u32 set)
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{
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int i;
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@ -363,7 +357,6 @@ static void pch_can_set_tx_all(struct pch_can_priv *priv, u32 set)
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static u32 pch_can_get_rxtx_ir(struct pch_can_priv *priv, u32 buff_num,
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enum pch_ifreg dir)
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{
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unsigned long flags;
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u32 ie, enable;
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if (dir)
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@ -371,7 +364,6 @@ static u32 pch_can_get_rxtx_ir(struct pch_can_priv *priv, u32 buff_num,
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else
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ie = PCH_IF_MCONT_TXIE;
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spin_lock_irqsave(&priv->msgif_reg_lock, flags);
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iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[dir].cmask);
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pch_can_check_if_busy(&priv->regs->ifregs[dir].creq, buff_num);
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@ -381,7 +373,6 @@ static u32 pch_can_get_rxtx_ir(struct pch_can_priv *priv, u32 buff_num,
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} else {
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enable = 0;
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}
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spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
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return enable;
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}
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@ -393,9 +384,6 @@ static int pch_can_int_pending(struct pch_can_priv *priv)
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static void pch_can_set_rx_buffer_link(struct pch_can_priv *priv,
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u32 buffer_num, u32 set)
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{
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unsigned long flags;
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spin_lock_irqsave(&priv->msgif_reg_lock, flags);
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iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[0].cmask);
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pch_can_check_if_busy(&priv->regs->ifregs[0].creq, buffer_num);
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iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL,
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@ -407,15 +395,11 @@ static void pch_can_set_rx_buffer_link(struct pch_can_priv *priv,
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pch_can_bit_set(&priv->regs->ifregs[0].mcont, PCH_IF_MCONT_EOB);
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pch_can_check_if_busy(&priv->regs->ifregs[0].creq, buffer_num);
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spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
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}
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static void pch_can_get_rx_buffer_link(struct pch_can_priv *priv,
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u32 buffer_num, u32 *link)
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{
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unsigned long flags;
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spin_lock_irqsave(&priv->msgif_reg_lock, flags);
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iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[0].cmask);
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pch_can_check_if_busy(&priv->regs->ifregs[0].creq, buffer_num);
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@ -423,7 +407,6 @@ static void pch_can_get_rx_buffer_link(struct pch_can_priv *priv,
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*link = PCH_DISABLE;
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else
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*link = PCH_ENABLE;
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spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
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}
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static void pch_can_clear_buffers(struct pch_can_priv *priv)
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@ -468,9 +451,6 @@ static void pch_can_clear_buffers(struct pch_can_priv *priv)
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static void pch_can_config_rx_tx_buffers(struct pch_can_priv *priv)
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{
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int i;
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unsigned long flags;
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spin_lock_irqsave(&priv->msgif_reg_lock, flags);
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for (i = PCH_RX_OBJ_START; i <= PCH_RX_OBJ_END; i++) {
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iowrite32(PCH_CMASK_RX_TX_GET,
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@ -529,7 +509,6 @@ static void pch_can_config_rx_tx_buffers(struct pch_can_priv *priv)
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pch_can_check_if_busy(&priv->regs->ifregs[1].creq, i);
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}
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spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
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}
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static void pch_can_init(struct pch_can_priv *priv)
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@ -845,7 +824,6 @@ static int pch_can_rx_poll(struct napi_struct *napi, int quota)
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u32 int_stat;
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int rcv_pkts = 0;
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u32 reg_stat;
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unsigned long flags;
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int_stat = pch_can_int_pending(priv);
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if (!int_stat)
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@ -860,12 +838,10 @@ static int pch_can_rx_poll(struct napi_struct *napi, int quota)
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}
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if (reg_stat & PCH_TX_OK) {
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spin_lock_irqsave(&priv->msgif_reg_lock, flags);
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iowrite32(PCH_CMASK_RX_TX_GET,
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&priv->regs->ifregs[1].cmask);
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pch_can_check_if_busy(&priv->regs->ifregs[1].creq,
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ioread32(&priv->regs->intr));
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spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
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pch_can_bit_clear(&priv->regs->stat, PCH_TX_OK);
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}
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@ -879,22 +855,18 @@ static int pch_can_rx_poll(struct napi_struct *napi, int quota)
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MSG_OBJ:
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if ((int_stat >= PCH_RX_OBJ_START) && (int_stat <= PCH_RX_OBJ_END)) {
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spin_lock_irqsave(&priv->msgif_reg_lock, flags);
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rcv_pkts = pch_can_rx_normal(ndev, int_stat);
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spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
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if (rcv_pkts < 0)
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return 0;
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} else if ((int_stat >= PCH_TX_OBJ_START) &&
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(int_stat <= PCH_TX_OBJ_END)) {
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/* Handle transmission interrupt */
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can_get_echo_skb(ndev, int_stat - PCH_RX_OBJ_END - 1);
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spin_lock_irqsave(&priv->msgif_reg_lock, flags);
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iowrite32(PCH_CMASK_RX_TX_GET | PCH_CMASK_CLRINTPND,
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&priv->regs->ifregs[1].cmask);
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dlc = ioread32(&priv->regs->ifregs[1].mcont) &
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PCH_IF_MCONT_DLC;
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pch_can_check_if_busy(&priv->regs->ifregs[1].creq, int_stat);
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spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
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if (dlc > 8)
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dlc = 8;
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stats->tx_bytes += dlc;
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@ -1052,7 +1024,6 @@ static int pch_get_msg_obj_sts(struct net_device *ndev, u32 obj_id)
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static netdev_tx_t pch_xmit(struct sk_buff *skb, struct net_device *ndev)
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{
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int i, j;
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unsigned long flags;
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struct pch_can_priv *priv = netdev_priv(ndev);
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struct can_frame *cf = (struct can_frame *)skb->data;
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int tx_buffer_avail = 0;
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@ -1072,9 +1043,6 @@ static netdev_tx_t pch_xmit(struct sk_buff *skb, struct net_device *ndev)
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}
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priv->tx_obj++;
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/* Attaining the lock. */
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spin_lock_irqsave(&priv->msgif_reg_lock, flags);
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/* Reading the Msg Obj from the Msg RAM to the Interface register. */
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iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[1].cmask);
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pch_can_check_if_busy(&priv->regs->ifregs[1].creq, tx_buffer_avail);
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@ -1126,8 +1094,6 @@ static netdev_tx_t pch_xmit(struct sk_buff *skb, struct net_device *ndev)
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pch_can_check_if_busy(&priv->regs->ifregs[1].creq, tx_buffer_avail);
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spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
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return NETDEV_TX_OK;
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}
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