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Date: Mon, 9 Oct 2017 02:55:30 +0000
From: Andy Duan <fugang.duan@....com>
To: Troy Kisky <troy.kisky@...ndarydevices.com>,
"shawn.guo@...aro.org" <shawn.guo@...aro.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"davem@...emloft.net" <davem@...emloft.net>
CC: Fabio Estevam <fabio.estevam@....com>,
"lznuaa@...il.com" <lznuaa@...il.com>
Subject: RE: [PATCH net v1 2/2] net: fec: Let fec_ptp have its own interrupt
routine
From: Troy Kisky <troy.kisky@...ndarydevices.com> Sent: Tuesday, October 03, 2017 8:05 AM
>To: shawn.guo@...aro.org; Andy Duan <fugang.duan@....com>;
>netdev@...r.kernel.org; davem@...emloft.net
>Cc: Fabio Estevam <fabio.estevam@....com>; lznuaa@...il.com; Troy Kisky
><troy.kisky@...ndarydevices.com>
>Subject: [PATCH net v1 2/2] net: fec: Let fec_ptp have its own interrupt
>routine
>
>This is better for code locality and should slightly speed up normal interrupts.
>
>This also allows PPS clock output to start working for i.mx7. This is because
>i.mx7 was already using the limit of 3 interrupts, and needed another.
>
>Signed-off-by: Troy Kisky <troy.kisky@...ndarydevices.com>
>
>---
>If this patch is taken before the corresponding dtb file patch than time
>stamping will be momentarily broken.
>---
The two patches for PPS seems
> drivers/net/ethernet/freescale/fec.h | 1 -
> drivers/net/ethernet/freescale/fec_main.c | 15 +++---
>drivers/net/ethernet/freescale/fec_ptp.c | 77 ++++++++++++++++++--------
>-----
> 3 files changed, 52 insertions(+), 41 deletions(-)
>
>diff --git a/drivers/net/ethernet/freescale/fec.h
>b/drivers/net/ethernet/freescale/fec.h
>index ede1876a9a19..782509041102 100644
>--- a/drivers/net/ethernet/freescale/fec.h
>+++ b/drivers/net/ethernet/freescale/fec.h
>@@ -587,7 +587,6 @@ void fec_ptp_stop(struct platform_device *pdev);
>void fec_ptp_start_cyclecounter(struct net_device *ndev); int
>fec_ptp_set(struct net_device *ndev, struct ifreq *ifr); int
>fec_ptp_get(struct net_device *ndev, struct ifreq *ifr); -uint
>fec_ptp_check_pps_event(struct fec_enet_private *fep);
>
>
>/**********************************************************
>******************/
> #endif /* FEC_H */
>diff --git a/drivers/net/ethernet/freescale/fec_main.c
>b/drivers/net/ethernet/freescale/fec_main.c
>index 3dc2d771a222..80fe04165ba0 100644
>--- a/drivers/net/ethernet/freescale/fec_main.c
>+++ b/drivers/net/ethernet/freescale/fec_main.c
>@@ -1602,10 +1602,6 @@ fec_enet_interrupt(int irq, void *dev_id)
> ret = IRQ_HANDLED;
> complete(&fep->mdio_done);
> }
>-
>- if (fep->ptp_clock)
>- if (fec_ptp_check_pps_event(fep))
>- ret = IRQ_HANDLED;
> return ret;
> }
>
>@@ -3325,6 +3321,7 @@ fec_probe(struct platform_device *pdev)
> struct device_node *np = pdev->dev.of_node, *phy_node;
> int num_tx_qs;
> int num_rx_qs;
>+ int ptp_irq, j;
>
> fec_enet_get_queue_num(pdev, &num_tx_qs, &num_rx_qs);
>
>@@ -3472,20 +3469,24 @@ fec_probe(struct platform_device *pdev)
> if (ret)
> goto failed_init;
>
>- for (i = 0; i < FEC_IRQ_NUM; i++) {
>- irq = platform_get_irq(pdev, i);
>+ ptp_irq = platform_get_irq_byname(pdev, "ptp");
Here, interrupt-names property is required properties, it should update binding doc.
Also need to handle the return value checking.
>+ i = j = 0;
>+ while (i < FEC_IRQ_NUM) {
>+ irq = platform_get_irq(pdev, j++);
> if (irq < 0) {
> if (i)
> break;
> ret = irq;
> goto failed_irq;
> }
>+ if (irq == ptp_irq)
>+ continue;
> ret = devm_request_irq(&pdev->dev, irq, fec_enet_interrupt,
> 0, pdev->name, ndev);
> if (ret)
> goto failed_irq;
>
>- fep->irq[i] = irq;
>+ fep->irq[i++] = irq;
I think it is not necessary to split pps interrupt handler.
To support pps interrupt handler, just change the maximum interrupt number FEC_IRQ_NUM to 4 that minimize the code change.
> }
>
> init_completion(&fep->mdio_done);
>diff --git a/drivers/net/ethernet/freescale/fec_ptp.c
>b/drivers/net/ethernet/freescale/fec_ptp.c
>index 6ebad3fac81d..20e01a3ca453 100644
>--- a/drivers/net/ethernet/freescale/fec_ptp.c
>+++ b/drivers/net/ethernet/freescale/fec_ptp.c
>@@ -549,6 +549,38 @@ static void fec_time_keep(struct work_struct *work)
> schedule_delayed_work(&fep->time_keep, HZ); }
>
>+/*
>+ * This function checks the pps event and reloads the timer compare counter.
>+ */
>+static irqreturn_t fec_ptp_interrupt(int irq, void *dev_id) {
>+ struct net_device *ndev = dev_id;
>+ struct fec_enet_private *fep = netdev_priv(ndev);
>+ u32 val;
>+ u8 channel = fep->pps_channel;
>+ struct ptp_clock_event event;
>+
>+ val = readl(fep->hwp + FEC_TCSR(channel));
>+ if (val & FEC_T_TF_MASK) {
>+ /* Write the next next compare(not the next according the
>spec)
>+ * value to the register
>+ */
>+ writel(fep->next_counter, fep->hwp + FEC_TCCR(channel));
>+ do {
>+ writel(val, fep->hwp + FEC_TCSR(channel));
>+ } while (readl(fep->hwp + FEC_TCSR(channel)) &
>FEC_T_TF_MASK);
>+
>+ /* Update the counter; */
>+ fep->next_counter = (fep->next_counter + fep-
>>reload_period) &
>+fep->cc.mask;
>+
>+ event.type = PTP_CLOCK_PPS;
>+ ptp_clock_event(fep->ptp_clock, &event);
>+ return IRQ_HANDLED;
>+ }
>+
>+ return IRQ_NONE;
>+}
>+
> /**
> * fec_ptp_init
> * @ndev: The FEC network adapter
>@@ -562,6 +594,8 @@ void fec_ptp_init(struct platform_device *pdev) {
> struct net_device *ndev = platform_get_drvdata(pdev);
> struct fec_enet_private *fep = netdev_priv(ndev);
>+ int irq;
>+ int ret;
>
> fep->ptp_caps.owner = THIS_MODULE;
> snprintf(fep->ptp_caps.name, 16, "fec ptp"); @@ -587,6 +621,16 @@
>void fec_ptp_init(struct platform_device *pdev)
>
> INIT_DELAYED_WORK(&fep->time_keep, fec_time_keep);
>
>+ irq = platform_get_irq_byname(pdev, "ptp");
>+ if (irq < 0)
>+ return;
If dts don't set interrupt name, here break ptp function. Suppose PPS don't break ptp.
>+ ret = devm_request_irq(&pdev->dev, irq, fec_ptp_interrupt,
>+ 0, pdev->name, ndev);
>+ if (ret < 0) {
>+ dev_warn(&pdev->dev, "request for ptp irq failed(%d)\n",
>ret);
>+ return;
Ditto...
>+ }
>+
> fep->ptp_clock = ptp_clock_register(&fep->ptp_caps, &pdev->dev);
> if (IS_ERR(fep->ptp_clock)) {
> fep->ptp_clock = NULL;
>@@ -605,36 +649,3 @@ void fec_ptp_stop(struct platform_device *pdev)
> if (fep->ptp_clock)
> ptp_clock_unregister(fep->ptp_clock);
> }
>-
>-/**
>- * fec_ptp_check_pps_event
>- * @fep: the fec_enet_private structure handle
>- *
>- * This function check the pps event and reload the timer compare counter.
>- */
>-uint fec_ptp_check_pps_event(struct fec_enet_private *fep) -{
>- u32 val;
>- u8 channel = fep->pps_channel;
>- struct ptp_clock_event event;
>-
>- val = readl(fep->hwp + FEC_TCSR(channel));
>- if (val & FEC_T_TF_MASK) {
>- /* Write the next next compare(not the next according the
>spec)
>- * value to the register
>- */
>- writel(fep->next_counter, fep->hwp + FEC_TCCR(channel));
>- do {
>- writel(val, fep->hwp + FEC_TCSR(channel));
>- } while (readl(fep->hwp + FEC_TCSR(channel)) &
>FEC_T_TF_MASK);
>-
>- /* Update the counter; */
>- fep->next_counter = (fep->next_counter + fep-
>>reload_period) & fep->cc.mask;
>-
>- event.type = PTP_CLOCK_PPS;
>- ptp_clock_event(fep->ptp_clock, &event);
>- return 1;
>- }
>-
>- return 0;
>-}
>--
>2.11.0
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