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can: mcp251x: Move to threaded interrupts instead of workqueues.
This patch addresses concerns about efficiency of handling incoming packets. Handling of interrupts is done in a threaded interrupt handler which has a smaller latency than workqueues. This change needed a rework of the locking scheme that was much simplified. Some other (more or less longstanding) bugs are fixed: utilization of just half of the RX buffers, useless wait for interrupt on open, more reliable reset sequence. The MERR interrupt is not used anymore: it overloads the CPU in error-passive state without any additional information. One shot mode is disabled because it's not clear if it can be handled efficiently on this CAN controller. Signed-off-by: Christian Pellegrin <chripell@fsfe.org> Acked-by: Wolfgang Grandegger <wg@grandegger.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christian Pellegrin
David S. Miller
parent
35cfabdc5e
commit
bf66f3736a
@ -180,6 +180,14 @@
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#define RXBEID0_OFF 4
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#define RXBDLC_OFF 5
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#define RXBDAT_OFF 6
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#define RXFSIDH(n) ((n) * 4)
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#define RXFSIDL(n) ((n) * 4 + 1)
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#define RXFEID8(n) ((n) * 4 + 2)
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#define RXFEID0(n) ((n) * 4 + 3)
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#define RXMSIDH(n) ((n) * 4 + 0x20)
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#define RXMSIDL(n) ((n) * 4 + 0x21)
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#define RXMEID8(n) ((n) * 4 + 0x22)
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#define RXMEID0(n) ((n) * 4 + 0x23)
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#define GET_BYTE(val, byte) \
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(((val) >> ((byte) * 8)) & 0xff)
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@ -219,7 +227,8 @@ struct mcp251x_priv {
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struct net_device *net;
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struct spi_device *spi;
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struct mutex spi_lock; /* SPI buffer lock */
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struct mutex mcp_lock; /* SPI device lock */
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u8 *spi_tx_buf;
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u8 *spi_rx_buf;
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dma_addr_t spi_tx_dma;
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@ -227,11 +236,11 @@ struct mcp251x_priv {
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struct sk_buff *tx_skb;
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int tx_len;
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struct workqueue_struct *wq;
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struct work_struct tx_work;
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struct work_struct irq_work;
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struct completion awake;
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int wake;
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struct work_struct restart_work;
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int force_quit;
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int after_suspend;
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#define AFTER_SUSPEND_UP 1
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@ -245,7 +254,8 @@ static void mcp251x_clean(struct net_device *net)
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{
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struct mcp251x_priv *priv = netdev_priv(net);
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net->stats.tx_errors++;
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if (priv->tx_skb || priv->tx_len)
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net->stats.tx_errors++;
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if (priv->tx_skb)
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dev_kfree_skb(priv->tx_skb);
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if (priv->tx_len)
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@ -300,16 +310,12 @@ static u8 mcp251x_read_reg(struct spi_device *spi, uint8_t reg)
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struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev);
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u8 val = 0;
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mutex_lock(&priv->spi_lock);
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priv->spi_tx_buf[0] = INSTRUCTION_READ;
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priv->spi_tx_buf[1] = reg;
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mcp251x_spi_trans(spi, 3);
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val = priv->spi_rx_buf[2];
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mutex_unlock(&priv->spi_lock);
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return val;
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}
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@ -317,15 +323,11 @@ static void mcp251x_write_reg(struct spi_device *spi, u8 reg, uint8_t val)
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{
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struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev);
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mutex_lock(&priv->spi_lock);
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priv->spi_tx_buf[0] = INSTRUCTION_WRITE;
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priv->spi_tx_buf[1] = reg;
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priv->spi_tx_buf[2] = val;
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mcp251x_spi_trans(spi, 3);
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mutex_unlock(&priv->spi_lock);
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}
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static void mcp251x_write_bits(struct spi_device *spi, u8 reg,
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@ -333,16 +335,12 @@ static void mcp251x_write_bits(struct spi_device *spi, u8 reg,
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{
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struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev);
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mutex_lock(&priv->spi_lock);
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priv->spi_tx_buf[0] = INSTRUCTION_BIT_MODIFY;
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priv->spi_tx_buf[1] = reg;
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priv->spi_tx_buf[2] = mask;
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priv->spi_tx_buf[3] = val;
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mcp251x_spi_trans(spi, 4);
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mutex_unlock(&priv->spi_lock);
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}
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static void mcp251x_hw_tx_frame(struct spi_device *spi, u8 *buf,
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@ -358,10 +356,8 @@ static void mcp251x_hw_tx_frame(struct spi_device *spi, u8 *buf,
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mcp251x_write_reg(spi, TXBCTRL(tx_buf_idx) + i,
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buf[i]);
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} else {
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mutex_lock(&priv->spi_lock);
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memcpy(priv->spi_tx_buf, buf, TXBDAT_OFF + len);
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mcp251x_spi_trans(spi, TXBDAT_OFF + len);
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mutex_unlock(&priv->spi_lock);
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}
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}
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@ -408,13 +404,9 @@ static void mcp251x_hw_rx_frame(struct spi_device *spi, u8 *buf,
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for (; i < (RXBDAT_OFF + len); i++)
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buf[i] = mcp251x_read_reg(spi, RXBCTRL(buf_idx) + i);
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} else {
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mutex_lock(&priv->spi_lock);
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priv->spi_tx_buf[RXBCTRL_OFF] = INSTRUCTION_READ_RXB(buf_idx);
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mcp251x_spi_trans(spi, SPI_TRANSFER_BUF_LEN);
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memcpy(buf, priv->spi_rx_buf, SPI_TRANSFER_BUF_LEN);
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mutex_unlock(&priv->spi_lock);
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}
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}
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@ -467,21 +459,6 @@ static void mcp251x_hw_sleep(struct spi_device *spi)
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mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_SLEEP);
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}
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static void mcp251x_hw_wakeup(struct spi_device *spi)
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{
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struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev);
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priv->wake = 1;
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/* Can only wake up by generating a wake-up interrupt. */
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mcp251x_write_bits(spi, CANINTE, CANINTE_WAKIE, CANINTE_WAKIE);
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mcp251x_write_bits(spi, CANINTF, CANINTF_WAKIF, CANINTF_WAKIF);
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/* Wait until the device is awake */
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if (!wait_for_completion_timeout(&priv->awake, HZ))
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dev_err(&spi->dev, "MCP251x didn't wake-up\n");
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}
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static netdev_tx_t mcp251x_hard_start_xmit(struct sk_buff *skb,
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struct net_device *net)
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{
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@ -490,7 +467,6 @@ static netdev_tx_t mcp251x_hard_start_xmit(struct sk_buff *skb,
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if (priv->tx_skb || priv->tx_len) {
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dev_warn(&spi->dev, "hard_xmit called while tx busy\n");
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netif_stop_queue(net);
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return NETDEV_TX_BUSY;
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}
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@ -511,12 +487,13 @@ static int mcp251x_do_set_mode(struct net_device *net, enum can_mode mode)
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switch (mode) {
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case CAN_MODE_START:
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mcp251x_clean(net);
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/* We have to delay work since SPI I/O may sleep */
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priv->can.state = CAN_STATE_ERROR_ACTIVE;
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priv->restart_tx = 1;
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if (priv->can.restart_ms == 0)
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priv->after_suspend = AFTER_SUSPEND_RESTART;
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queue_work(priv->wq, &priv->irq_work);
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queue_work(priv->wq, &priv->restart_work);
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break;
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default:
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return -EOPNOTSUPP;
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@ -525,7 +502,7 @@ static int mcp251x_do_set_mode(struct net_device *net, enum can_mode mode)
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return 0;
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}
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static void mcp251x_set_normal_mode(struct spi_device *spi)
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static int mcp251x_set_normal_mode(struct spi_device *spi)
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{
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struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev);
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unsigned long timeout;
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@ -533,8 +510,7 @@ static void mcp251x_set_normal_mode(struct spi_device *spi)
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/* Enable interrupts */
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mcp251x_write_reg(spi, CANINTE,
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CANINTE_ERRIE | CANINTE_TX2IE | CANINTE_TX1IE |
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CANINTE_TX0IE | CANINTE_RX1IE | CANINTE_RX0IE |
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CANINTF_MERRF);
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CANINTE_TX0IE | CANINTE_RX1IE | CANINTE_RX0IE);
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if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) {
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/* Put device into loopback mode */
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@ -544,9 +520,7 @@ static void mcp251x_set_normal_mode(struct spi_device *spi)
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mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_LISTEN_ONLY);
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} else {
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/* Put device into normal mode */
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mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_NORMAL |
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(priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT ?
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CANCTRL_OSM : 0));
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mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_NORMAL);
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/* Wait for the device to enter normal mode */
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timeout = jiffies + HZ;
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@ -555,11 +529,12 @@ static void mcp251x_set_normal_mode(struct spi_device *spi)
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if (time_after(jiffies, timeout)) {
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dev_err(&spi->dev, "MCP251x didn't"
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" enter in normal mode\n");
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return;
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return -EBUSY;
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}
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}
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}
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priv->can.state = CAN_STATE_ERROR_ACTIVE;
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return 0;
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}
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static int mcp251x_do_set_bittiming(struct net_device *net)
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@ -590,33 +565,39 @@ static int mcp251x_setup(struct net_device *net, struct mcp251x_priv *priv,
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{
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mcp251x_do_set_bittiming(net);
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/* Enable RX0->RX1 buffer roll over and disable filters */
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mcp251x_write_bits(spi, RXBCTRL(0),
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RXBCTRL_BUKT | RXBCTRL_RXM0 | RXBCTRL_RXM1,
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RXBCTRL_BUKT | RXBCTRL_RXM0 | RXBCTRL_RXM1);
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mcp251x_write_bits(spi, RXBCTRL(1),
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RXBCTRL_RXM0 | RXBCTRL_RXM1,
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RXBCTRL_RXM0 | RXBCTRL_RXM1);
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mcp251x_write_reg(spi, RXBCTRL(0),
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RXBCTRL_BUKT | RXBCTRL_RXM0 | RXBCTRL_RXM1);
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mcp251x_write_reg(spi, RXBCTRL(1),
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RXBCTRL_RXM0 | RXBCTRL_RXM1);
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return 0;
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}
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static void mcp251x_hw_reset(struct spi_device *spi)
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static int mcp251x_hw_reset(struct spi_device *spi)
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{
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struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev);
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int ret;
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mutex_lock(&priv->spi_lock);
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unsigned long timeout;
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priv->spi_tx_buf[0] = INSTRUCTION_RESET;
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ret = spi_write(spi, priv->spi_tx_buf, 1);
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mutex_unlock(&priv->spi_lock);
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if (ret)
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if (ret) {
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dev_err(&spi->dev, "reset failed: ret = %d\n", ret);
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return -EIO;
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}
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/* Wait for reset to finish */
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timeout = jiffies + HZ;
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mdelay(10);
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while ((mcp251x_read_reg(spi, CANSTAT) & CANCTRL_REQOP_MASK)
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!= CANCTRL_REQOP_CONF) {
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schedule();
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if (time_after(jiffies, timeout)) {
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dev_err(&spi->dev, "MCP251x didn't"
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" enter in conf mode after reset\n");
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return -EBUSY;
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}
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}
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return 0;
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}
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static int mcp251x_hw_probe(struct spi_device *spi)
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@ -640,63 +621,17 @@ static int mcp251x_hw_probe(struct spi_device *spi)
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return (st1 == 0x80 && st2 == 0x07) ? 1 : 0;
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}
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static irqreturn_t mcp251x_can_isr(int irq, void *dev_id)
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{
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struct net_device *net = (struct net_device *)dev_id;
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struct mcp251x_priv *priv = netdev_priv(net);
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/* Schedule bottom half */
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if (!work_pending(&priv->irq_work))
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queue_work(priv->wq, &priv->irq_work);
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return IRQ_HANDLED;
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}
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static int mcp251x_open(struct net_device *net)
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static void mcp251x_open_clean(struct net_device *net)
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{
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struct mcp251x_priv *priv = netdev_priv(net);
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struct spi_device *spi = priv->spi;
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struct mcp251x_platform_data *pdata = spi->dev.platform_data;
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int ret;
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ret = open_candev(net);
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if (ret) {
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dev_err(&spi->dev, "unable to set initial baudrate!\n");
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return ret;
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}
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free_irq(spi->irq, priv);
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mcp251x_hw_sleep(spi);
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if (pdata->transceiver_enable)
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pdata->transceiver_enable(1);
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priv->force_quit = 0;
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priv->tx_skb = NULL;
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priv->tx_len = 0;
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ret = request_irq(spi->irq, mcp251x_can_isr,
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IRQF_TRIGGER_FALLING, DEVICE_NAME, net);
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if (ret) {
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dev_err(&spi->dev, "failed to acquire irq %d\n", spi->irq);
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if (pdata->transceiver_enable)
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pdata->transceiver_enable(0);
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close_candev(net);
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return ret;
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}
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mcp251x_hw_wakeup(spi);
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mcp251x_hw_reset(spi);
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ret = mcp251x_setup(net, priv, spi);
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if (ret) {
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free_irq(spi->irq, net);
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mcp251x_hw_sleep(spi);
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if (pdata->transceiver_enable)
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pdata->transceiver_enable(0);
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close_candev(net);
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return ret;
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}
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mcp251x_set_normal_mode(spi);
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netif_wake_queue(net);
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return 0;
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pdata->transceiver_enable(0);
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close_candev(net);
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}
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static int mcp251x_stop(struct net_device *net)
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@ -707,17 +642,19 @@ static int mcp251x_stop(struct net_device *net)
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close_candev(net);
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priv->force_quit = 1;
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free_irq(spi->irq, priv);
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destroy_workqueue(priv->wq);
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priv->wq = NULL;
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mutex_lock(&priv->mcp_lock);
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/* Disable and clear pending interrupts */
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mcp251x_write_reg(spi, CANINTE, 0x00);
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mcp251x_write_reg(spi, CANINTF, 0x00);
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priv->force_quit = 1;
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free_irq(spi->irq, net);
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flush_workqueue(priv->wq);
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mcp251x_write_reg(spi, TXBCTRL(0), 0);
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if (priv->tx_skb || priv->tx_len)
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mcp251x_clean(net);
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mcp251x_clean(net);
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mcp251x_hw_sleep(spi);
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@ -726,9 +663,27 @@ static int mcp251x_stop(struct net_device *net)
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priv->can.state = CAN_STATE_STOPPED;
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mutex_unlock(&priv->mcp_lock);
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return 0;
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}
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static void mcp251x_error_skb(struct net_device *net, int can_id, int data1)
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{
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struct sk_buff *skb;
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struct can_frame *frame;
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skb = alloc_can_err_skb(net, &frame);
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if (skb) {
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frame->can_id = can_id;
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frame->data[1] = data1;
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netif_rx(skb);
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} else {
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dev_err(&net->dev,
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"cannot allocate error skb\n");
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}
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}
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static void mcp251x_tx_work_handler(struct work_struct *ws)
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{
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struct mcp251x_priv *priv = container_of(ws, struct mcp251x_priv,
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@ -737,33 +692,32 @@ static void mcp251x_tx_work_handler(struct work_struct *ws)
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struct net_device *net = priv->net;
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struct can_frame *frame;
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mutex_lock(&priv->mcp_lock);
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if (priv->tx_skb) {
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frame = (struct can_frame *)priv->tx_skb->data;
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if (priv->can.state == CAN_STATE_BUS_OFF) {
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mcp251x_clean(net);
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netif_wake_queue(net);
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return;
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} else {
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frame = (struct can_frame *)priv->tx_skb->data;
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if (frame->can_dlc > CAN_FRAME_MAX_DATA_LEN)
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frame->can_dlc = CAN_FRAME_MAX_DATA_LEN;
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mcp251x_hw_tx(spi, frame, 0);
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priv->tx_len = 1 + frame->can_dlc;
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can_put_echo_skb(priv->tx_skb, net, 0);
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priv->tx_skb = NULL;
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}
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if (frame->can_dlc > CAN_FRAME_MAX_DATA_LEN)
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frame->can_dlc = CAN_FRAME_MAX_DATA_LEN;
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mcp251x_hw_tx(spi, frame, 0);
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priv->tx_len = 1 + frame->can_dlc;
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can_put_echo_skb(priv->tx_skb, net, 0);
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priv->tx_skb = NULL;
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}
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mutex_unlock(&priv->mcp_lock);
|
||||
}
|
||||
|
||||
static void mcp251x_irq_work_handler(struct work_struct *ws)
|
||||
static void mcp251x_restart_work_handler(struct work_struct *ws)
|
||||
{
|
||||
struct mcp251x_priv *priv = container_of(ws, struct mcp251x_priv,
|
||||
irq_work);
|
||||
restart_work);
|
||||
struct spi_device *spi = priv->spi;
|
||||
struct net_device *net = priv->net;
|
||||
u8 txbnctrl;
|
||||
u8 intf;
|
||||
enum can_state new_state;
|
||||
|
||||
mutex_lock(&priv->mcp_lock);
|
||||
if (priv->after_suspend) {
|
||||
mdelay(10);
|
||||
mcp251x_hw_reset(spi);
|
||||
@ -772,45 +726,54 @@ static void mcp251x_irq_work_handler(struct work_struct *ws)
|
||||
mcp251x_set_normal_mode(spi);
|
||||
} else if (priv->after_suspend & AFTER_SUSPEND_UP) {
|
||||
netif_device_attach(net);
|
||||
/* Clean since we lost tx buffer */
|
||||
if (priv->tx_skb || priv->tx_len) {
|
||||
mcp251x_clean(net);
|
||||
netif_wake_queue(net);
|
||||
}
|
||||
mcp251x_clean(net);
|
||||
mcp251x_set_normal_mode(spi);
|
||||
netif_wake_queue(net);
|
||||
} else {
|
||||
mcp251x_hw_sleep(spi);
|
||||
}
|
||||
priv->after_suspend = 0;
|
||||
priv->force_quit = 0;
|
||||
}
|
||||
|
||||
if (priv->can.restart_ms == 0 && priv->can.state == CAN_STATE_BUS_OFF)
|
||||
return;
|
||||
if (priv->restart_tx) {
|
||||
priv->restart_tx = 0;
|
||||
mcp251x_write_reg(spi, TXBCTRL(0), 0);
|
||||
mcp251x_clean(net);
|
||||
netif_wake_queue(net);
|
||||
mcp251x_error_skb(net, CAN_ERR_RESTARTED, 0);
|
||||
}
|
||||
mutex_unlock(&priv->mcp_lock);
|
||||
}
|
||||
|
||||
while (!priv->force_quit && !freezing(current)) {
|
||||
u8 eflag = mcp251x_read_reg(spi, EFLG);
|
||||
static irqreturn_t mcp251x_can_ist(int irq, void *dev_id)
|
||||
{
|
||||
struct mcp251x_priv *priv = dev_id;
|
||||
struct spi_device *spi = priv->spi;
|
||||
struct net_device *net = priv->net;
|
||||
|
||||
mutex_lock(&priv->mcp_lock);
|
||||
while (!priv->force_quit) {
|
||||
enum can_state new_state;
|
||||
u8 intf = mcp251x_read_reg(spi, CANINTF);
|
||||
u8 eflag;
|
||||
int can_id = 0, data1 = 0;
|
||||
|
||||
mcp251x_write_reg(spi, EFLG, 0x00);
|
||||
|
||||
if (priv->restart_tx) {
|
||||
priv->restart_tx = 0;
|
||||
mcp251x_write_reg(spi, TXBCTRL(0), 0);
|
||||
if (priv->tx_skb || priv->tx_len)
|
||||
mcp251x_clean(net);
|
||||
netif_wake_queue(net);
|
||||
can_id |= CAN_ERR_RESTARTED;
|
||||
if (intf & CANINTF_RX0IF) {
|
||||
mcp251x_hw_rx(spi, 0);
|
||||
/* Free one buffer ASAP */
|
||||
mcp251x_write_bits(spi, CANINTF, intf & CANINTF_RX0IF,
|
||||
0x00);
|
||||
}
|
||||
|
||||
if (priv->wake) {
|
||||
/* Wait whilst the device wakes up */
|
||||
mdelay(10);
|
||||
priv->wake = 0;
|
||||
}
|
||||
if (intf & CANINTF_RX1IF)
|
||||
mcp251x_hw_rx(spi, 1);
|
||||
|
||||
intf = mcp251x_read_reg(spi, CANINTF);
|
||||
mcp251x_write_bits(spi, CANINTF, intf, 0x00);
|
||||
|
||||
eflag = mcp251x_read_reg(spi, EFLG);
|
||||
mcp251x_write_reg(spi, EFLG, 0x00);
|
||||
|
||||
/* Update can state */
|
||||
if (eflag & EFLG_TXBO) {
|
||||
new_state = CAN_STATE_BUS_OFF;
|
||||
@ -851,59 +814,31 @@ static void mcp251x_irq_work_handler(struct work_struct *ws)
|
||||
}
|
||||
priv->can.state = new_state;
|
||||
|
||||
if ((intf & CANINTF_ERRIF) || (can_id & CAN_ERR_RESTARTED)) {
|
||||
struct sk_buff *skb;
|
||||
struct can_frame *frame;
|
||||
|
||||
/* Create error frame */
|
||||
skb = alloc_can_err_skb(net, &frame);
|
||||
if (skb) {
|
||||
/* Set error frame flags based on bus state */
|
||||
frame->can_id = can_id;
|
||||
frame->data[1] = data1;
|
||||
|
||||
/* Update net stats for overflows */
|
||||
if (eflag & (EFLG_RX0OVR | EFLG_RX1OVR)) {
|
||||
if (eflag & EFLG_RX0OVR)
|
||||
net->stats.rx_over_errors++;
|
||||
if (eflag & EFLG_RX1OVR)
|
||||
net->stats.rx_over_errors++;
|
||||
frame->can_id |= CAN_ERR_CRTL;
|
||||
frame->data[1] |=
|
||||
CAN_ERR_CRTL_RX_OVERFLOW;
|
||||
}
|
||||
|
||||
netif_rx(skb);
|
||||
} else {
|
||||
dev_info(&spi->dev,
|
||||
"cannot allocate error skb\n");
|
||||
if (intf & CANINTF_ERRIF) {
|
||||
/* Handle overflow counters */
|
||||
if (eflag & (EFLG_RX0OVR | EFLG_RX1OVR)) {
|
||||
if (eflag & EFLG_RX0OVR)
|
||||
net->stats.rx_over_errors++;
|
||||
if (eflag & EFLG_RX1OVR)
|
||||
net->stats.rx_over_errors++;
|
||||
can_id |= CAN_ERR_CRTL;
|
||||
data1 |= CAN_ERR_CRTL_RX_OVERFLOW;
|
||||
}
|
||||
mcp251x_error_skb(net, can_id, data1);
|
||||
}
|
||||
|
||||
if (priv->can.state == CAN_STATE_BUS_OFF) {
|
||||
if (priv->can.restart_ms == 0) {
|
||||
priv->force_quit = 1;
|
||||
can_bus_off(net);
|
||||
mcp251x_hw_sleep(spi);
|
||||
return;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (intf == 0)
|
||||
break;
|
||||
|
||||
if (intf & CANINTF_WAKIF)
|
||||
complete(&priv->awake);
|
||||
|
||||
if (intf & CANINTF_MERRF) {
|
||||
/* If there are pending Tx buffers, restart queue */
|
||||
txbnctrl = mcp251x_read_reg(spi, TXBCTRL(0));
|
||||
if (!(txbnctrl & TXBCTRL_TXREQ)) {
|
||||
if (priv->tx_skb || priv->tx_len)
|
||||
mcp251x_clean(net);
|
||||
netif_wake_queue(net);
|
||||
}
|
||||
}
|
||||
|
||||
if (intf & (CANINTF_TX2IF | CANINTF_TX1IF | CANINTF_TX0IF)) {
|
||||
net->stats.tx_packets++;
|
||||
net->stats.tx_bytes += priv->tx_len - 1;
|
||||
@ -914,12 +849,66 @@ static void mcp251x_irq_work_handler(struct work_struct *ws)
|
||||
netif_wake_queue(net);
|
||||
}
|
||||
|
||||
if (intf & CANINTF_RX0IF)
|
||||
mcp251x_hw_rx(spi, 0);
|
||||
|
||||
if (intf & CANINTF_RX1IF)
|
||||
mcp251x_hw_rx(spi, 1);
|
||||
}
|
||||
mutex_unlock(&priv->mcp_lock);
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static int mcp251x_open(struct net_device *net)
|
||||
{
|
||||
struct mcp251x_priv *priv = netdev_priv(net);
|
||||
struct spi_device *spi = priv->spi;
|
||||
struct mcp251x_platform_data *pdata = spi->dev.platform_data;
|
||||
int ret;
|
||||
|
||||
ret = open_candev(net);
|
||||
if (ret) {
|
||||
dev_err(&spi->dev, "unable to set initial baudrate!\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
mutex_lock(&priv->mcp_lock);
|
||||
if (pdata->transceiver_enable)
|
||||
pdata->transceiver_enable(1);
|
||||
|
||||
priv->force_quit = 0;
|
||||
priv->tx_skb = NULL;
|
||||
priv->tx_len = 0;
|
||||
|
||||
ret = request_threaded_irq(spi->irq, NULL, mcp251x_can_ist,
|
||||
IRQF_TRIGGER_FALLING, DEVICE_NAME, priv);
|
||||
if (ret) {
|
||||
dev_err(&spi->dev, "failed to acquire irq %d\n", spi->irq);
|
||||
if (pdata->transceiver_enable)
|
||||
pdata->transceiver_enable(0);
|
||||
close_candev(net);
|
||||
goto open_unlock;
|
||||
}
|
||||
|
||||
priv->wq = create_freezeable_workqueue("mcp251x_wq");
|
||||
INIT_WORK(&priv->tx_work, mcp251x_tx_work_handler);
|
||||
INIT_WORK(&priv->restart_work, mcp251x_restart_work_handler);
|
||||
|
||||
ret = mcp251x_hw_reset(spi);
|
||||
if (ret) {
|
||||
mcp251x_open_clean(net);
|
||||
goto open_unlock;
|
||||
}
|
||||
ret = mcp251x_setup(net, priv, spi);
|
||||
if (ret) {
|
||||
mcp251x_open_clean(net);
|
||||
goto open_unlock;
|
||||
}
|
||||
ret = mcp251x_set_normal_mode(spi);
|
||||
if (ret) {
|
||||
mcp251x_open_clean(net);
|
||||
goto open_unlock;
|
||||
}
|
||||
netif_wake_queue(net);
|
||||
|
||||
open_unlock:
|
||||
mutex_unlock(&priv->mcp_lock);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static const struct net_device_ops mcp251x_netdev_ops = {
|
||||
@ -955,13 +944,11 @@ static int __devinit mcp251x_can_probe(struct spi_device *spi)
|
||||
priv->can.clock.freq = pdata->oscillator_frequency / 2;
|
||||
priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
|
||||
CAN_CTRLMODE_LOOPBACK | CAN_CTRLMODE_LISTENONLY;
|
||||
if (pdata->model == CAN_MCP251X_MCP2515)
|
||||
priv->can.ctrlmode_supported |= CAN_CTRLMODE_ONE_SHOT;
|
||||
priv->net = net;
|
||||
dev_set_drvdata(&spi->dev, priv);
|
||||
|
||||
priv->spi = spi;
|
||||
mutex_init(&priv->spi_lock);
|
||||
mutex_init(&priv->mcp_lock);
|
||||
|
||||
/* If requested, allocate DMA buffers */
|
||||
if (mcp251x_enable_dma) {
|
||||
@ -1010,18 +997,12 @@ static int __devinit mcp251x_can_probe(struct spi_device *spi)
|
||||
|
||||
SET_NETDEV_DEV(net, &spi->dev);
|
||||
|
||||
priv->wq = create_freezeable_workqueue("mcp251x_wq");
|
||||
|
||||
INIT_WORK(&priv->tx_work, mcp251x_tx_work_handler);
|
||||
INIT_WORK(&priv->irq_work, mcp251x_irq_work_handler);
|
||||
|
||||
init_completion(&priv->awake);
|
||||
|
||||
/* Configure the SPI bus */
|
||||
spi->mode = SPI_MODE_0;
|
||||
spi->bits_per_word = 8;
|
||||
spi_setup(spi);
|
||||
|
||||
/* Here is OK to not lock the MCP, no one knows about it yet */
|
||||
if (!mcp251x_hw_probe(spi)) {
|
||||
dev_info(&spi->dev, "Probe failed\n");
|
||||
goto error_probe;
|
||||
@ -1064,10 +1045,6 @@ static int __devexit mcp251x_can_remove(struct spi_device *spi)
|
||||
unregister_candev(net);
|
||||
free_candev(net);
|
||||
|
||||
priv->force_quit = 1;
|
||||
flush_workqueue(priv->wq);
|
||||
destroy_workqueue(priv->wq);
|
||||
|
||||
if (mcp251x_enable_dma) {
|
||||
dma_free_coherent(&spi->dev, PAGE_SIZE,
|
||||
priv->spi_tx_buf, priv->spi_tx_dma);
|
||||
@ -1089,6 +1066,12 @@ static int mcp251x_can_suspend(struct spi_device *spi, pm_message_t state)
|
||||
struct mcp251x_priv *priv = dev_get_drvdata(&spi->dev);
|
||||
struct net_device *net = priv->net;
|
||||
|
||||
priv->force_quit = 1;
|
||||
disable_irq(spi->irq);
|
||||
/*
|
||||
* Note: at this point neither IST nor workqueues are running.
|
||||
* open/stop cannot be called anyway so locking is not needed
|
||||
*/
|
||||
if (netif_running(net)) {
|
||||
netif_device_detach(net);
|
||||
|
||||
@ -1115,16 +1098,18 @@ static int mcp251x_can_resume(struct spi_device *spi)
|
||||
|
||||
if (priv->after_suspend & AFTER_SUSPEND_POWER) {
|
||||
pdata->power_enable(1);
|
||||
queue_work(priv->wq, &priv->irq_work);
|
||||
queue_work(priv->wq, &priv->restart_work);
|
||||
} else {
|
||||
if (priv->after_suspend & AFTER_SUSPEND_UP) {
|
||||
if (pdata->transceiver_enable)
|
||||
pdata->transceiver_enable(1);
|
||||
queue_work(priv->wq, &priv->irq_work);
|
||||
queue_work(priv->wq, &priv->restart_work);
|
||||
} else {
|
||||
priv->after_suspend = 0;
|
||||
}
|
||||
}
|
||||
priv->force_quit = 0;
|
||||
enable_irq(spi->irq);
|
||||
return 0;
|
||||
}
|
||||
#else
|
||||
|
||||
Loading…
Reference in New Issue
Block a user