| Message ID | 20230424195402.516-2-jm@ti.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Enable multiple MCAN on AM62x | expand |
On 24.04.2023 14:53:59, Judith Mendez wrote: > Add an hrtimer to MCAN class device. Each MCAN will have its own > hrtimer instantiated if there is no hardware interrupt found and > poll-interval property is defined in device tree M_CAN node. > > The hrtimer will generate a software interrupt every 1 ms. In > hrtimer callback, we check if there is a transaction pending by > reading a register, then process by calling the isr if there is. > > Signed-off-by: Judith Mendez <jm@ti.com> > --- > Changelog: > v2: > 1. Add poll-interval to MCAN class device to check if poll-interval propery is > present in MCAN node, this enables timer polling method. > 2. Add 'polling' flag to MCAN class device to check if a device is using timer > polling method > 3. Check if both timer polling and hardware interrupt are enabled for a MCAN > device, default to hardware interrupt mode if both are enabled. > 4. Changed ms_to_ktime() to ns_to_ktime() > 5. Removed newlines, tabs, and restructure if/else section. > > drivers/net/can/m_can/m_can.c | 30 ++++++++++++++++++++----- > drivers/net/can/m_can/m_can.h | 5 +++++ > drivers/net/can/m_can/m_can_platform.c | 31 ++++++++++++++++++++++++-- > 3 files changed, 59 insertions(+), 7 deletions(-) > > diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c > index a5003435802b..33e094f88da1 100644 > --- a/drivers/net/can/m_can/m_can.c > +++ b/drivers/net/can/m_can/m_can.c > @@ -23,6 +23,7 @@ > #include <linux/pinctrl/consumer.h> > #include <linux/platform_device.h> > #include <linux/pm_runtime.h> > +#include <linux/hrtimer.h> keep the list of includes sorted > > #include "m_can.h" > > @@ -1587,6 +1588,11 @@ static int m_can_close(struct net_device *dev) > if (!cdev->is_peripheral) > napi_disable(&cdev->napi); > > + if (cdev->polling) { > + dev_dbg(cdev->dev, "Disabling the hrtimer\n"); > + hrtimer_cancel(&cdev->hrtimer); > + } > + > m_can_stop(dev); > m_can_clk_stop(cdev); > free_irq(dev->irq, dev); > @@ -1793,6 +1799,18 @@ static netdev_tx_t m_can_start_xmit(struct sk_buff *skb, > return NETDEV_TX_OK; > } > > +enum hrtimer_restart hrtimer_callback(struct hrtimer *timer) > +{ > + struct m_can_classdev *cdev = > + container_of(timer, struct m_can_classdev, hrtimer); > + > + m_can_isr(0, cdev->net); > + > + hrtimer_forward_now(timer, ms_to_ktime(1)); Please create a define for this > + > + return HRTIMER_RESTART; > +} > + > static int m_can_open(struct net_device *dev) > { > struct m_can_classdev *cdev = netdev_priv(dev); > @@ -1827,13 +1845,15 @@ static int m_can_open(struct net_device *dev) > } > > INIT_WORK(&cdev->tx_work, m_can_tx_work_queue); > - > err = request_threaded_irq(dev->irq, NULL, m_can_isr, > - IRQF_ONESHOT, > - dev->name, dev); > - } else { > - err = request_irq(dev->irq, m_can_isr, IRQF_SHARED, dev->name, > + IRQF_ONESHOT, dev->name, dev); > + } else if (!cdev->polling) { > + err = request_irq(dev->irq, m_can_isr, IRQF_SHARED, dev->name, > dev); No need to change the indention > + } else { > + dev_dbg(cdev->dev, "Start hrtimer\n"); > + cdev->hrtimer.function = &hrtimer_callback; > + hrtimer_start(&cdev->hrtimer, ms_to_ktime(cdev->poll_interval), HRTIMER_MODE_REL_PINNED); > } > > if (err < 0) { > diff --git a/drivers/net/can/m_can/m_can.h b/drivers/net/can/m_can/m_can.h > index a839dc71dc9b..1ba87eb23f8e 100644 > --- a/drivers/net/can/m_can/m_can.h > +++ b/drivers/net/can/m_can/m_can.h > @@ -28,6 +28,7 @@ > #include <linux/pm_runtime.h> > #include <linux/slab.h> > #include <linux/uaccess.h> > +#include <linux/hrtimer.h> keep the list of includes sorted > > /* m_can lec values */ > enum m_can_lec_type { > @@ -93,6 +94,10 @@ struct m_can_classdev { > int is_peripheral; > > struct mram_cfg mcfg[MRAM_CFG_NUM]; > + > + struct hrtimer hrtimer; > + u32 poll_interval; > + u8 polling; bool > }; > > struct m_can_classdev *m_can_class_allocate_dev(struct device *dev, int sizeof_priv); > diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c > index 9c1dcf838006..e899c04edc01 100644 > --- a/drivers/net/can/m_can/m_can_platform.c > +++ b/drivers/net/can/m_can/m_can_platform.c > @@ -7,6 +7,7 @@ > > #include <linux/phy/phy.h> > #include <linux/platform_device.h> > +#include <linux/hrtimer.h> > > #include "m_can.h" > > @@ -97,11 +98,37 @@ static int m_can_plat_probe(struct platform_device *pdev) > > addr = devm_platform_ioremap_resource_byname(pdev, "m_can"); > irq = platform_get_irq_byname(pdev, "int0"); use platform_get_irq_byname_optional(), it doesn't print an error message. > - if (IS_ERR(addr) || irq < 0) { > - ret = -EINVAL; > + if (irq == -EPROBE_DEFER) { > + ret = -EPROBE_DEFER; > goto probe_fail; > } > > + if (IS_ERR(addr)) { > + ret = PTR_ERR(addr); > + goto probe_fail; > + } please move the error check for "addr" directly after the "addr = " assignment. > + > + mcan_class->polling = 0; No need to init as "0" > + if (device_property_present(mcan_class->dev, "poll-interval")) { > + mcan_class->polling = 1; > + } No need for the { } here. > + > + if (!mcan_class->polling && irq < 0) { > + ret = -ENODATA; -ENXIO > + dev_dbg(mcan_class->dev, "Polling not enabled\n"); print a proper error message using dev_err_probe("IRQ %s not found and polling not activated\n") > + goto probe_fail; > + } > + > + if (mcan_class->polling && irq > 0) { > + mcan_class->polling = 0; > + dev_dbg(mcan_class->dev, "Polling not enabled, hardware interrupt exists\n"); > + } > + > + if (mcan_class->polling && irq < 0) { > + dev_dbg(mcan_class->dev, "Polling enabled, initialize hrtimer"); > + hrtimer_init(&mcan_class->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_PINNED); > + } combine both if (mcan_class->polling) into one. > + > /* message ram could be shared */ > res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "message_ram"); > if (!res) { > -- > 2.17.1 > > Marc
Hello Marc, On 4/24/2023 3:14 PM, Marc Kleine-Budde wrote: > On 24.04.2023 14:53:59, Judith Mendez wrote: >> Add an hrtimer to MCAN class device. Each MCAN will have its own >> hrtimer instantiated if there is no hardware interrupt found and >> poll-interval property is defined in device tree M_CAN node. >> >> The hrtimer will generate a software interrupt every 1 ms. In >> hrtimer callback, we check if there is a transaction pending by >> reading a register, then process by calling the isr if there is. >> >> Signed-off-by: Judith Mendez <jm@ti.com> >> --- >> Changelog: >> v2: >> 1. Add poll-interval to MCAN class device to check if poll-interval propery is >> present in MCAN node, this enables timer polling method. >> 2. Add 'polling' flag to MCAN class device to check if a device is using timer >> polling method >> 3. Check if both timer polling and hardware interrupt are enabled for a MCAN >> device, default to hardware interrupt mode if both are enabled. >> 4. Changed ms_to_ktime() to ns_to_ktime() >> 5. Removed newlines, tabs, and restructure if/else section. >> >> drivers/net/can/m_can/m_can.c | 30 ++++++++++++++++++++----- >> drivers/net/can/m_can/m_can.h | 5 +++++ >> drivers/net/can/m_can/m_can_platform.c | 31 ++++++++++++++++++++++++-- >> 3 files changed, 59 insertions(+), 7 deletions(-) >> >> diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c >> index a5003435802b..33e094f88da1 100644 >> --- a/drivers/net/can/m_can/m_can.c >> +++ b/drivers/net/can/m_can/m_can.c >> @@ -23,6 +23,7 @@ >> #include <linux/pinctrl/consumer.h> >> #include <linux/platform_device.h> >> #include <linux/pm_runtime.h> >> +#include <linux/hrtimer.h> > > keep the list of includes sorted > Will do. >> >> #include "m_can.h" >> >> @@ -1587,6 +1588,11 @@ static int m_can_close(struct net_device *dev) >> if (!cdev->is_peripheral) >> napi_disable(&cdev->napi); >> >> + if (cdev->polling) { >> + dev_dbg(cdev->dev, "Disabling the hrtimer\n"); >> + hrtimer_cancel(&cdev->hrtimer); >> + } >> + >> m_can_stop(dev); >> m_can_clk_stop(cdev); >> free_irq(dev->irq, dev); >> @@ -1793,6 +1799,18 @@ static netdev_tx_t m_can_start_xmit(struct sk_buff *skb, >> return NETDEV_TX_OK; >> } >> >> +enum hrtimer_restart hrtimer_callback(struct hrtimer *timer) >> +{ >> + struct m_can_classdev *cdev = >> + container_of(timer, struct m_can_classdev, hrtimer); >> + >> + m_can_isr(0, cdev->net); >> + >> + hrtimer_forward_now(timer, ms_to_ktime(1)); > > Please create a define for this > Thanks, will create a define for the 1 ms polling interval. >> + >> + return HRTIMER_RESTART; >> +} >> + >> static int m_can_open(struct net_device *dev) >> { >> struct m_can_classdev *cdev = netdev_priv(dev); >> @@ -1827,13 +1845,15 @@ static int m_can_open(struct net_device *dev) >> } >> >> INIT_WORK(&cdev->tx_work, m_can_tx_work_queue); >> - >> err = request_threaded_irq(dev->irq, NULL, m_can_isr, >> - IRQF_ONESHOT, >> - dev->name, dev); >> - } else { >> - err = request_irq(dev->irq, m_can_isr, IRQF_SHARED, dev->name, >> + IRQF_ONESHOT, dev->name, dev); >> + } else if (!cdev->polling) { >> + err = request_irq(dev->irq, m_can_isr, IRQF_SHARED, dev->name, >> dev); > > No need to change the indention > Will fix. >> + } else { >> + dev_dbg(cdev->dev, "Start hrtimer\n"); >> + cdev->hrtimer.function = &hrtimer_callback; >> + hrtimer_start(&cdev->hrtimer, ms_to_ktime(cdev->poll_interval), HRTIMER_MODE_REL_PINNED); >> } >> >> if (err < 0) { >> diff --git a/drivers/net/can/m_can/m_can.h b/drivers/net/can/m_can/m_can.h >> index a839dc71dc9b..1ba87eb23f8e 100644 >> --- a/drivers/net/can/m_can/m_can.h >> +++ b/drivers/net/can/m_can/m_can.h >> @@ -28,6 +28,7 @@ >> #include <linux/pm_runtime.h> >> #include <linux/slab.h> >> #include <linux/uaccess.h> >> +#include <linux/hrtimer.h> > > keep the list of includes sorted > >> >> /* m_can lec values */ >> enum m_can_lec_type { >> @@ -93,6 +94,10 @@ struct m_can_classdev { >> int is_peripheral; >> >> struct mram_cfg mcfg[MRAM_CFG_NUM]; >> + >> + struct hrtimer hrtimer; >> + u32 poll_interval; >> + u8 polling; > > bool > Will use bool instead. >> }; >> >> struct m_can_classdev *m_can_class_allocate_dev(struct device *dev, int sizeof_priv); >> diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c >> index 9c1dcf838006..e899c04edc01 100644 >> --- a/drivers/net/can/m_can/m_can_platform.c >> +++ b/drivers/net/can/m_can/m_can_platform.c >> @@ -7,6 +7,7 @@ >> >> #include <linux/phy/phy.h> >> #include <linux/platform_device.h> >> +#include <linux/hrtimer.h> >> >> #include "m_can.h" >> >> @@ -97,11 +98,37 @@ static int m_can_plat_probe(struct platform_device *pdev) >> >> addr = devm_platform_ioremap_resource_byname(pdev, "m_can"); >> irq = platform_get_irq_byname(pdev, "int0"); > > use platform_get_irq_byname_optional(), it doesn't print an error > message. > Thanks. >> - if (IS_ERR(addr) || irq < 0) { >> - ret = -EINVAL; >> + if (irq == -EPROBE_DEFER) { >> + ret = -EPROBE_DEFER; >> goto probe_fail; >> } >> >> + if (IS_ERR(addr)) { >> + ret = PTR_ERR(addr); >> + goto probe_fail; >> + } > > please move the error check for "addr" directly after the "addr = " > assignment. > Will do. >> + >> + mcan_class->polling = 0; > > No need to init as "0" > Awsome thanks. >> + if (device_property_present(mcan_class->dev, "poll-interval")) { >> + mcan_class->polling = 1; >> + } > > No need for the { } here. > >> + >> + if (!mcan_class->polling && irq < 0) { >> + ret = -ENODATA; > -ENXIO >> + dev_dbg(mcan_class->dev, "Polling not enabled\n"); > > print a proper error message using dev_err_probe("IRQ %s not found and > polling not activated\n") > Why %s when MCAN requests 1 IRQ which is "int0"? If we want to print "int0", should it be hardcoded into the print error message? >> + goto probe_fail; >> + } >> + >> + if (mcan_class->polling && irq > 0) { >> + mcan_class->polling = 0; >> + dev_dbg(mcan_class->dev, "Polling not enabled, hardware interrupt exists\n"); >> + } >> + >> + if (mcan_class->polling && irq < 0) { >> + dev_dbg(mcan_class->dev, "Polling enabled, initialize hrtimer"); >> + hrtimer_init(&mcan_class->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_PINNED); >> + } > > combine both if (mcan_class->polling) into one. > Will do. >> + >> /* message ram could be shared */ >> res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "message_ram"); >> if (!res) { >> -- >> 2.17.1 >> >> regards, Judith
On 26.04.2023 11:11:12, Mendez, Judith wrote: [...] > > print a proper error message using dev_err_probe("IRQ %s not found and > > polling not activated\n") > > > Why %s when MCAN requests 1 IRQ which is "int0"? If we want to print "int0", > should it be hardcoded into the print error message? I think I copied the error message from platform_get_irq_byname() and extended it. Of course it makes sense to hardcode the IRQ name. Marc
On Mon, Apr 24, 2023 at 02:53:59PM -0500, Judith Mendez wrote: > Add an hrtimer to MCAN class device. Each MCAN will have its own > hrtimer instantiated if there is no hardware interrupt found and > poll-interval property is defined in device tree M_CAN node. > > The hrtimer will generate a software interrupt every 1 ms. In > hrtimer callback, we check if there is a transaction pending by > reading a register, then process by calling the isr if there is. > > Signed-off-by: Judith Mendez <jm@ti.com> > --- > Changelog: > v2: > 1. Add poll-interval to MCAN class device to check if poll-interval propery is > present in MCAN node, this enables timer polling method. > 2. Add 'polling' flag to MCAN class device to check if a device is using timer > polling method > 3. Check if both timer polling and hardware interrupt are enabled for a MCAN > device, default to hardware interrupt mode if both are enabled. > 4. Changed ms_to_ktime() to ns_to_ktime() > 5. Removed newlines, tabs, and restructure if/else section. > > drivers/net/can/m_can/m_can.c | 30 ++++++++++++++++++++----- > drivers/net/can/m_can/m_can.h | 5 +++++ > drivers/net/can/m_can/m_can_platform.c | 31 ++++++++++++++++++++++++-- > 3 files changed, 59 insertions(+), 7 deletions(-) > > diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c > index a5003435802b..33e094f88da1 100644 > --- a/drivers/net/can/m_can/m_can.c > +++ b/drivers/net/can/m_can/m_can.c > @@ -23,6 +23,7 @@ > #include <linux/pinctrl/consumer.h> > #include <linux/platform_device.h> > #include <linux/pm_runtime.h> > +#include <linux/hrtimer.h> > > #include "m_can.h" > > @@ -1587,6 +1588,11 @@ static int m_can_close(struct net_device *dev) > if (!cdev->is_peripheral) > napi_disable(&cdev->napi); > > + if (cdev->polling) { > + dev_dbg(cdev->dev, "Disabling the hrtimer\n"); > + hrtimer_cancel(&cdev->hrtimer); > + } > + > m_can_stop(dev); > m_can_clk_stop(cdev); > free_irq(dev->irq, dev); > @@ -1793,6 +1799,18 @@ static netdev_tx_t m_can_start_xmit(struct sk_buff *skb, > return NETDEV_TX_OK; > } > > +enum hrtimer_restart hrtimer_callback(struct hrtimer *timer) Hi Judith, This function seems to only be used in this file, so it should be static. > +{ > + struct m_can_classdev *cdev = > + container_of(timer, struct m_can_classdev, hrtimer); > + > + m_can_isr(0, cdev->net); > + > + hrtimer_forward_now(timer, ms_to_ktime(1)); > + > + return HRTIMER_RESTART; > +} > + ...
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c index a5003435802b..33e094f88da1 100644 --- a/drivers/net/can/m_can/m_can.c +++ b/drivers/net/can/m_can/m_can.c @@ -23,6 +23,7 @@ #include <linux/pinctrl/consumer.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> +#include <linux/hrtimer.h> #include "m_can.h" @@ -1587,6 +1588,11 @@ static int m_can_close(struct net_device *dev) if (!cdev->is_peripheral) napi_disable(&cdev->napi); + if (cdev->polling) { + dev_dbg(cdev->dev, "Disabling the hrtimer\n"); + hrtimer_cancel(&cdev->hrtimer); + } + m_can_stop(dev); m_can_clk_stop(cdev); free_irq(dev->irq, dev); @@ -1793,6 +1799,18 @@ static netdev_tx_t m_can_start_xmit(struct sk_buff *skb, return NETDEV_TX_OK; } +enum hrtimer_restart hrtimer_callback(struct hrtimer *timer) +{ + struct m_can_classdev *cdev = + container_of(timer, struct m_can_classdev, hrtimer); + + m_can_isr(0, cdev->net); + + hrtimer_forward_now(timer, ms_to_ktime(1)); + + return HRTIMER_RESTART; +} + static int m_can_open(struct net_device *dev) { struct m_can_classdev *cdev = netdev_priv(dev); @@ -1827,13 +1845,15 @@ static int m_can_open(struct net_device *dev) } INIT_WORK(&cdev->tx_work, m_can_tx_work_queue); - err = request_threaded_irq(dev->irq, NULL, m_can_isr, - IRQF_ONESHOT, - dev->name, dev); - } else { - err = request_irq(dev->irq, m_can_isr, IRQF_SHARED, dev->name, + IRQF_ONESHOT, dev->name, dev); + } else if (!cdev->polling) { + err = request_irq(dev->irq, m_can_isr, IRQF_SHARED, dev->name, dev); + } else { + dev_dbg(cdev->dev, "Start hrtimer\n"); + cdev->hrtimer.function = &hrtimer_callback; + hrtimer_start(&cdev->hrtimer, ms_to_ktime(cdev->poll_interval), HRTIMER_MODE_REL_PINNED); } if (err < 0) { diff --git a/drivers/net/can/m_can/m_can.h b/drivers/net/can/m_can/m_can.h index a839dc71dc9b..1ba87eb23f8e 100644 --- a/drivers/net/can/m_can/m_can.h +++ b/drivers/net/can/m_can/m_can.h @@ -28,6 +28,7 @@ #include <linux/pm_runtime.h> #include <linux/slab.h> #include <linux/uaccess.h> +#include <linux/hrtimer.h> /* m_can lec values */ enum m_can_lec_type { @@ -93,6 +94,10 @@ struct m_can_classdev { int is_peripheral; struct mram_cfg mcfg[MRAM_CFG_NUM]; + + struct hrtimer hrtimer; + u32 poll_interval; + u8 polling; }; struct m_can_classdev *m_can_class_allocate_dev(struct device *dev, int sizeof_priv); diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c index 9c1dcf838006..e899c04edc01 100644 --- a/drivers/net/can/m_can/m_can_platform.c +++ b/drivers/net/can/m_can/m_can_platform.c @@ -7,6 +7,7 @@ #include <linux/phy/phy.h> #include <linux/platform_device.h> +#include <linux/hrtimer.h> #include "m_can.h" @@ -97,11 +98,37 @@ static int m_can_plat_probe(struct platform_device *pdev) addr = devm_platform_ioremap_resource_byname(pdev, "m_can"); irq = platform_get_irq_byname(pdev, "int0"); - if (IS_ERR(addr) || irq < 0) { - ret = -EINVAL; + if (irq == -EPROBE_DEFER) { + ret = -EPROBE_DEFER; goto probe_fail; } + if (IS_ERR(addr)) { + ret = PTR_ERR(addr); + goto probe_fail; + } + + mcan_class->polling = 0; + if (device_property_present(mcan_class->dev, "poll-interval")) { + mcan_class->polling = 1; + } + + if (!mcan_class->polling && irq < 0) { + ret = -ENODATA; + dev_dbg(mcan_class->dev, "Polling not enabled\n"); + goto probe_fail; + } + + if (mcan_class->polling && irq > 0) { + mcan_class->polling = 0; + dev_dbg(mcan_class->dev, "Polling not enabled, hardware interrupt exists\n"); + } + + if (mcan_class->polling && irq < 0) { + dev_dbg(mcan_class->dev, "Polling enabled, initialize hrtimer"); + hrtimer_init(&mcan_class->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_PINNED); + } + /* message ram could be shared */ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "message_ram"); if (!res) {
Add an hrtimer to MCAN class device. Each MCAN will have its own hrtimer instantiated if there is no hardware interrupt found and poll-interval property is defined in device tree M_CAN node. The hrtimer will generate a software interrupt every 1 ms. In hrtimer callback, we check if there is a transaction pending by reading a register, then process by calling the isr if there is. Signed-off-by: Judith Mendez <jm@ti.com> --- Changelog: v2: 1. Add poll-interval to MCAN class device to check if poll-interval propery is present in MCAN node, this enables timer polling method. 2. Add 'polling' flag to MCAN class device to check if a device is using timer polling method 3. Check if both timer polling and hardware interrupt are enabled for a MCAN device, default to hardware interrupt mode if both are enabled. 4. Changed ms_to_ktime() to ns_to_ktime() 5. Removed newlines, tabs, and restructure if/else section. drivers/net/can/m_can/m_can.c | 30 ++++++++++++++++++++----- drivers/net/can/m_can/m_can.h | 5 +++++ drivers/net/can/m_can/m_can_platform.c | 31 ++++++++++++++++++++++++-- 3 files changed, 59 insertions(+), 7 deletions(-)