From 8badd65e48c90d66587359d5329c2813088c0f50 Mon Sep 17 00:00:00 2001 From: David Jander Date: Wed, 27 Aug 2014 12:02:16 +0200 Subject: can: flexcan: avoid calling usleep_range from interrupt context Apparently can_restart() runs from a (timer-) interrupt and can call flexcan_chip_[en|dis]able(), so avoid using usleep_range() Signed-off-by: David Jander Cc: linux-stable Signed-off-by: Marc Kleine-Budde --- drivers/net/can/flexcan.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'drivers/net/can') diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index 944aa5d..630c7bf 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -298,7 +298,7 @@ static int flexcan_chip_enable(struct flexcan_priv *priv) flexcan_write(reg, ®s->mcr); while (timeout-- && (flexcan_read(®s->mcr) & FLEXCAN_MCR_LPM_ACK)) - usleep_range(10, 20); + udelay(10); if (flexcan_read(®s->mcr) & FLEXCAN_MCR_LPM_ACK) return -ETIMEDOUT; @@ -317,7 +317,7 @@ static int flexcan_chip_disable(struct flexcan_priv *priv) flexcan_write(reg, ®s->mcr); while (timeout-- && !(flexcan_read(®s->mcr) & FLEXCAN_MCR_LPM_ACK)) - usleep_range(10, 20); + udelay(10); if (!(flexcan_read(®s->mcr) & FLEXCAN_MCR_LPM_ACK)) return -ETIMEDOUT; @@ -336,7 +336,7 @@ static int flexcan_chip_freeze(struct flexcan_priv *priv) flexcan_write(reg, ®s->mcr); while (timeout-- && !(flexcan_read(®s->mcr) & FLEXCAN_MCR_FRZ_ACK)) - usleep_range(100, 200); + udelay(100); if (!(flexcan_read(®s->mcr) & FLEXCAN_MCR_FRZ_ACK)) return -ETIMEDOUT; @@ -355,7 +355,7 @@ static int flexcan_chip_unfreeze(struct flexcan_priv *priv) flexcan_write(reg, ®s->mcr); while (timeout-- && (flexcan_read(®s->mcr) & FLEXCAN_MCR_FRZ_ACK)) - usleep_range(10, 20); + udelay(10); if (flexcan_read(®s->mcr) & FLEXCAN_MCR_FRZ_ACK) return -ETIMEDOUT; @@ -370,7 +370,7 @@ static int flexcan_chip_softreset(struct flexcan_priv *priv) flexcan_write(FLEXCAN_MCR_SOFTRST, ®s->mcr); while (timeout-- && (flexcan_read(®s->mcr) & FLEXCAN_MCR_SOFTRST)) - usleep_range(10, 20); + udelay(10); if (flexcan_read(®s->mcr) & FLEXCAN_MCR_SOFTRST) return -ETIMEDOUT; -- cgit v1.1 From a7380db5f0d6dd94981e73da08d8fa863ee72235 Mon Sep 17 00:00:00 2001 From: Roger Quadros Date: Tue, 9 Sep 2014 17:31:08 +0300 Subject: can: c_can_platform: fix parameters of c_can_hw_raminit_ti() Pass the correct 'mask' and 'value' bits to c_can_hw_raminit_wait_ti(). They seem to have been swapped in the usage instances. Reported-by: Jay Schroeder Signed-off-by: Roger Quadros Cc: linux-stable Signed-off-by: Marc Kleine-Budde --- drivers/net/can/c_can/c_can_platform.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers/net/can') diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c index 109cb44..fb279d6 100644 --- a/drivers/net/can/c_can/c_can_platform.c +++ b/drivers/net/can/c_can/c_can_platform.c @@ -97,14 +97,14 @@ static void c_can_hw_raminit_ti(const struct c_can_priv *priv, bool enable) ctrl |= CAN_RAMINIT_DONE_MASK(priv->instance); writel(ctrl, priv->raminit_ctrlreg); ctrl &= ~CAN_RAMINIT_DONE_MASK(priv->instance); - c_can_hw_raminit_wait_ti(priv, ctrl, mask); + c_can_hw_raminit_wait_ti(priv, mask, ctrl); if (enable) { /* Set start bit and wait for the done bit. */ ctrl |= CAN_RAMINIT_START_MASK(priv->instance); writel(ctrl, priv->raminit_ctrlreg); ctrl |= CAN_RAMINIT_DONE_MASK(priv->instance); - c_can_hw_raminit_wait_ti(priv, ctrl, mask); + c_can_hw_raminit_wait_ti(priv, mask, ctrl); } spin_unlock(&raminit_lock); } -- cgit v1.1 From 4be0015c955a9a6e26395dbaba4bfdedf8f755ca Mon Sep 17 00:00:00 2001 From: Oliver Hartkopp Date: Tue, 16 Sep 2014 10:05:41 +0200 Subject: can: peak_pci: add PCI ID definition pcie card variant Add PCI ID definition for the single channel PCAN ExpressCard 34 adapter. Due to the subsystem id evaluation the correct number of channels (here 1) is created at initialization time. Tested including the LED functionality. Signed-off-by: Oliver Hartkopp Acked-by: Stephane Grosjean Signed-off-by: Marc Kleine-Budde --- drivers/net/can/sja1000/peak_pci.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'drivers/net/can') diff --git a/drivers/net/can/sja1000/peak_pci.c b/drivers/net/can/sja1000/peak_pci.c index 7a85590..e5fac36 100644 --- a/drivers/net/can/sja1000/peak_pci.c +++ b/drivers/net/can/sja1000/peak_pci.c @@ -70,6 +70,8 @@ struct peak_pci_chan { #define PEAK_PC_104P_DEVICE_ID 0x0006 /* PCAN-PC/104+ cards */ #define PEAK_PCI_104E_DEVICE_ID 0x0007 /* PCAN-PCI/104 Express cards */ #define PEAK_MPCIE_DEVICE_ID 0x0008 /* The miniPCIe slot cards */ +#define PEAK_PCIE_OEM_ID 0x0009 /* PCAN-PCI Express OEM */ +#define PEAK_PCIEC34_DEVICE_ID 0x000A /* PCAN-PCI Express 34 (one channel) */ #define PEAK_PCI_CHAN_MAX 4 @@ -87,6 +89,7 @@ static const struct pci_device_id peak_pci_tbl[] = { {PEAK_PCI_VENDOR_ID, PEAK_CPCI_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, #ifdef CONFIG_CAN_PEAK_PCIEC {PEAK_PCI_VENDOR_ID, PEAK_PCIEC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, + {PEAK_PCI_VENDOR_ID, PEAK_PCIEC34_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, #endif {0,} }; @@ -653,7 +656,8 @@ static int peak_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent) * This must be done *before* register_sja1000dev() but * *after* devices linkage */ - if (pdev->device == PEAK_PCIEC_DEVICE_ID) { + if (pdev->device == PEAK_PCIEC_DEVICE_ID || + pdev->device == PEAK_PCIEC34_DEVICE_ID) { err = peak_pciec_probe(pdev, dev); if (err) { dev_err(&pdev->dev, -- cgit v1.1 From c32fe4ad3e4861b2bfa1f44114c564935a123dda Mon Sep 17 00:00:00 2001 From: Marc Kleine-Budde Date: Tue, 16 Sep 2014 12:39:28 +0200 Subject: can: flexcan: mark TX mailbox as TX_INACTIVE This patch fixes the initialization of the TX mailbox. It is now correctly initialized as TX_INACTIVE not RX_EMPTY. Cc: linux-stable Signed-off-by: Marc Kleine-Budde --- drivers/net/can/flexcan.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) (limited to 'drivers/net/can') diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index 630c7bf..76dcbca 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -136,6 +136,17 @@ /* FLEXCAN message buffers */ #define FLEXCAN_MB_CNT_CODE(x) (((x) & 0xf) << 24) +#define FLEXCAN_MB_CODE_RX_INACTIVE (0x0 << 24) +#define FLEXCAN_MB_CODE_RX_EMPTY (0x4 << 24) +#define FLEXCAN_MB_CODE_RX_FULL (0x2 << 24) +#define FLEXCAN_MB_CODE_RX_OVERRRUN (0x6 << 24) +#define FLEXCAN_MB_CODE_RX_RANSWER (0xa << 24) + +#define FLEXCAN_MB_CODE_TX_INACTIVE (0x8 << 24) +#define FLEXCAN_MB_CODE_TX_ABORT (0x9 << 24) +#define FLEXCAN_MB_CODE_TX_DATA (0xc << 24) +#define FLEXCAN_MB_CODE_TX_TANSWER (0xe << 24) + #define FLEXCAN_MB_CNT_SRR BIT(22) #define FLEXCAN_MB_CNT_IDE BIT(21) #define FLEXCAN_MB_CNT_RTR BIT(20) @@ -867,8 +878,8 @@ static int flexcan_chip_start(struct net_device *dev) netdev_dbg(dev, "%s: writing ctrl=0x%08x", __func__, reg_ctrl); flexcan_write(reg_ctrl, ®s->ctrl); - /* Abort any pending TX, mark Mailbox as INACTIVE */ - flexcan_write(FLEXCAN_MB_CNT_CODE(0x4), + /* mark TX mailbox as INACTIVE */ + flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl); /* acceptance mask/acceptance code (accept everything) */ -- cgit v1.1 From fc05b884a31dbf259cc73cc856e634ec3acbebb6 Mon Sep 17 00:00:00 2001 From: David Jander Date: Wed, 27 Aug 2014 11:58:05 +0200 Subject: can: flexcan: correctly initialize mailboxes Apparently mailboxes may contain random data at startup, causing some of them being prepared for message reception. This causes overruns being missed or even confusing the IRQ check for trasmitted messages, increasing the transmit counter instead of the error counter. This patch initializes all mailboxes after the FIFO as RX_INACTIVE. Signed-off-by: David Jander Cc: linux-stable Signed-off-by: Marc Kleine-Budde --- drivers/net/can/flexcan.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'drivers/net/can') diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index 76dcbca..fc076952 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -812,6 +812,7 @@ static int flexcan_chip_start(struct net_device *dev) struct flexcan_regs __iomem *regs = priv->base; int err; u32 reg_mcr, reg_ctrl; + int i; /* enable module */ err = flexcan_chip_enable(priv); @@ -878,6 +879,12 @@ static int flexcan_chip_start(struct net_device *dev) netdev_dbg(dev, "%s: writing ctrl=0x%08x", __func__, reg_ctrl); flexcan_write(reg_ctrl, ®s->ctrl); + /* clear and invalidate all mailboxes first */ + for (i = FLEXCAN_TX_BUF_ID; i < ARRAY_SIZE(regs->cantxfg); i++) { + flexcan_write(FLEXCAN_MB_CODE_RX_INACTIVE, + ®s->cantxfg[i].can_ctrl); + } + /* mark TX mailbox as INACTIVE */ flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl); -- cgit v1.1 From 25e924450fcb23c11c07c95ea8964dd9f174652e Mon Sep 17 00:00:00 2001 From: David Jander Date: Wed, 3 Sep 2014 16:47:22 +0200 Subject: can: flexcan: implement workaround for errata ERR005829 This patch implements the workaround mentioned in ERR005829: ERR005829: FlexCAN: FlexCAN does not transmit a message that is enabled to be transmitted in a specific moment during the arbitration process. Workaround: The workaround consists of two extra steps after setting up a message for transmission: Step 8: Reserve the first valid mailbox as an inactive mailbox (CODE=0b1000). If RX FIFO is disabled, this mailbox must be message buffer 0. Otherwise, the first valid mailbox can be found using the "RX FIFO filters" table in the FlexCAN chapter of the chip reference manual. Step 9: Write twice INACTIVE code (0b1000) into the first valid mailbox. Signed-off-by: David Jander Cc: linux-stable Signed-off-by: Marc Kleine-Budde --- drivers/net/can/flexcan.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) (limited to 'drivers/net/can') diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index fc076952..54061c4 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -125,7 +125,9 @@ FLEXCAN_ESR_BOFF_INT | FLEXCAN_ESR_ERR_INT) /* FLEXCAN interrupt flag register (IFLAG) bits */ -#define FLEXCAN_TX_BUF_ID 8 +/* Errata ERR005829 step7: Reserve first valid MB */ +#define FLEXCAN_TX_BUF_RESERVED 8 +#define FLEXCAN_TX_BUF_ID 9 #define FLEXCAN_IFLAG_BUF(x) BIT(x) #define FLEXCAN_IFLAG_RX_FIFO_OVERFLOW BIT(7) #define FLEXCAN_IFLAG_RX_FIFO_WARN BIT(6) @@ -439,6 +441,14 @@ static int flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev) flexcan_write(can_id, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_id); flexcan_write(ctrl, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl); + /* Errata ERR005829 step8: + * Write twice INACTIVE(0x8) code to first MB. + */ + flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE, + ®s->cantxfg[FLEXCAN_TX_BUF_RESERVED].can_ctrl); + flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE, + ®s->cantxfg[FLEXCAN_TX_BUF_RESERVED].can_ctrl); + return NETDEV_TX_OK; } @@ -885,6 +895,10 @@ static int flexcan_chip_start(struct net_device *dev) ®s->cantxfg[i].can_ctrl); } + /* Errata ERR005829: mark first TX mailbox as INACTIVE */ + flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE, + ®s->cantxfg[FLEXCAN_TX_BUF_RESERVED].can_ctrl); + /* mark TX mailbox as INACTIVE */ flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl); -- cgit v1.1 From de5944883ebbedbf5adc8497659772f5da7b7d72 Mon Sep 17 00:00:00 2001 From: Marc Kleine-Budde Date: Tue, 16 Sep 2014 15:31:27 +0200 Subject: can: flexcan: put TX mailbox into TX_INACTIVE mode after tx-complete After sending a RTR frame the TX mailbox becomes a RX_EMPTY mailbox. To avoid side effects when the RX-FIFO is full, this patch puts the TX mailbox into TX_INACTIVE mode in the transmission complete interrupt handler. This, of course, leaves a race window between the actual completion of the transmission and the handling of tx-complete interrupt. However this is the best we can do without busy polling the tx complete interrupt. Cc: linux-stable Signed-off-by: Marc Kleine-Budde --- drivers/net/can/flexcan.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/net/can') diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index 54061c4..c17ae9e 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -765,6 +765,9 @@ static irqreturn_t flexcan_irq(int irq, void *dev_id) stats->tx_bytes += can_get_echo_skb(dev, 0); stats->tx_packets++; can_led_event(dev, CAN_LED_EVENT_TX); + /* after sending a RTR frame mailbox is in RX mode */ + flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE, + ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl); flexcan_write((1 << FLEXCAN_TX_BUF_ID), ®s->iflag1); netif_wake_queue(dev); } -- cgit v1.1 From 4c728d804c4b9d1ae7f76e8f32c419bc21a6e540 Mon Sep 17 00:00:00 2001 From: Marc Kleine-Budde Date: Tue, 2 Sep 2014 16:54:17 +0200 Subject: can: flexcan: increase FLEXCAN_MCR_MAXMB() macro to 7 bits This patch increases the mask in the FLEXCAN_MCR_MAXMB() to 7 bits as in the newer flexcan cores the MAXMB field is 7 bits wide. Reported-by: David Jander Signed-off-by: Marc Kleine-Budde --- drivers/net/can/flexcan.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/net/can') diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index c17ae9e..6586309 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -62,7 +62,7 @@ #define FLEXCAN_MCR_BCC BIT(16) #define FLEXCAN_MCR_LPRIO_EN BIT(13) #define FLEXCAN_MCR_AEN BIT(12) -#define FLEXCAN_MCR_MAXMB(x) ((x) & 0x1f) +#define FLEXCAN_MCR_MAXMB(x) ((x) & 0x7f) #define FLEXCAN_MCR_IDAM_A (0 << 8) #define FLEXCAN_MCR_IDAM_B (1 << 8) #define FLEXCAN_MCR_IDAM_C (2 << 8) -- cgit v1.1 From e77980e50bc2850599d4d9c0192b67a9ffd6daac Mon Sep 17 00:00:00 2001 From: David Dueck Date: Wed, 17 Sep 2014 14:26:48 +0200 Subject: can: at91_can: add missing prepare and unprepare of the clock In order to make the driver work with the common clock framework, this patch converts the clk_enable()/clk_disable() to clk_prepare_enable()/clk_disable_unprepare(). While there, add the missing error handling. Signed-off-by: David Dueck Signed-off-by: Anthony Harivel Acked-by: Boris Brezillon Cc: linux-stable Signed-off-by: Marc Kleine-Budde --- drivers/net/can/at91_can.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) (limited to 'drivers/net/can') diff --git a/drivers/net/can/at91_can.c b/drivers/net/can/at91_can.c index f07fa89..05e1aa0 100644 --- a/drivers/net/can/at91_can.c +++ b/drivers/net/can/at91_can.c @@ -1123,7 +1123,9 @@ static int at91_open(struct net_device *dev) struct at91_priv *priv = netdev_priv(dev); int err; - clk_enable(priv->clk); + err = clk_prepare_enable(priv->clk); + if (err) + return err; /* check or determine and set bittime */ err = open_candev(dev); @@ -1149,7 +1151,7 @@ static int at91_open(struct net_device *dev) out_close: close_candev(dev); out: - clk_disable(priv->clk); + clk_disable_unprepare(priv->clk); return err; } @@ -1166,7 +1168,7 @@ static int at91_close(struct net_device *dev) at91_chip_stop(dev, CAN_STATE_STOPPED); free_irq(dev->irq, dev); - clk_disable(priv->clk); + clk_disable_unprepare(priv->clk); close_candev(dev); -- cgit v1.1