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Date: Mon, 2 Oct 2017 17:04:42 -0700
From: Troy Kisky <troy.kisky@...ndarydevices.com>
To: shawn.guo@...aro.org, fugang.duan@....com, netdev@...r.kernel.org,
davem@...emloft.net
Cc: 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.
---
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");
+ 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;
}
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;
+ 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;
+ }
+
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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