From: lakshmi.sowjanya.d@intel.com To: tglx@linutronix.de, jstultz@google.com, giometti@enneenne.com, corbet@lwn.net, linux-kernel@vger.kernel.org Cc: x86@kernel.org, netdev@vger.kernel.org, linux-doc@vger.kernel.org, intel-wired-lan@lists.osuosl.org, andriy.shevchenko@linux.intel.com, eddie.dong@intel.com, christopher.s.hall@intel.com, jesse.brandeburg@intel.com, davem@davemloft.net, alexandre.torgue@foss.st.com, joabreu@synopsys.com, mcoquelin.stm32@gmail.com, perex@perex.cz, linux-sound@vger.kernel.org, anthony.l.nguyen@intel.com, peter.hilber@opensynergy.com, pandith.n@intel.com, subramanian.mohan@intel.com, thejesh.reddy.t.r@intel.com, lakshmi.sowjanya.d@intel.com Subject: [PATCH v6 09/11] pps: generators: Add PPS Generator TIO Driver Date: Wed, 10 Apr 2024 17:18:26 +0530 [thread overview] Message-ID: <20240410114828.25581-10-lakshmi.sowjanya.d@intel.com> (raw) In-Reply-To: <20240410114828.25581-1-lakshmi.sowjanya.d@intel.com> From: Lakshmi Sowjanya D <lakshmi.sowjanya.d@intel.com> The Intel Timed IO PPS generator driver outputs a PPS signal using dedicated hardware that is more accurate than software actuated PPS. The Timed IO hardware generates output events using the ART timer. The ART timer period varies based on platform type, but is less than 100 nanoseconds for all current platforms. Timed IO output accuracy is within 1 ART period. PPS output is enabled by writing '1' the 'enable' sysfs attribute. The driver uses hrtimers to schedule a wake-up 10 ms before each event (edge) target time. At wakeup, the driver converts the target time in terms of CLOCK_REALTIME to ART trigger time and writes this to the Timed IO hardware. The Timed IO hardware generates an event precisely at the requested system time without software involvement. Co-developed-by: Christopher Hall <christopher.s.hall@intel.com> Signed-off-by: Christopher Hall <christopher.s.hall@intel.com> Co-developed-by: Pandith N <pandith.n@intel.com> Signed-off-by: Pandith N <pandith.n@intel.com> Co-developed-by: Thejesh Reddy T R <thejesh.reddy.t.r@intel.com> Signed-off-by: Thejesh Reddy T R <thejesh.reddy.t.r@intel.com> Signed-off-by: Lakshmi Sowjanya D <lakshmi.sowjanya.d@intel.com> Reviewed-by: Eddie Dong <eddie.dong@intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Rodolfo Giometti <giometti@enneenne.com> --- drivers/pps/generators/Kconfig | 16 ++ drivers/pps/generators/Makefile | 1 + drivers/pps/generators/pps_gen_tio.c | 258 +++++++++++++++++++++++++++ 3 files changed, 275 insertions(+) create mode 100644 drivers/pps/generators/pps_gen_tio.c diff --git a/drivers/pps/generators/Kconfig b/drivers/pps/generators/Kconfig index d615e640fcad..0f090932336f 100644 --- a/drivers/pps/generators/Kconfig +++ b/drivers/pps/generators/Kconfig @@ -12,3 +12,19 @@ config PPS_GENERATOR_PARPORT If you say yes here you get support for a PPS signal generator which utilizes STROBE pin of a parallel port to send PPS signals. It uses parport abstraction layer and hrtimers to precisely control the signal. + +config PPS_GENERATOR_TIO + tristate "TIO PPS signal generator" + depends on X86 && CPU_SUP_INTEL + help + If you say yes here you get support for a PPS TIO signal generator + which generates a pulse at a prescribed time based on the system clock. + It uses time translation and hrtimers to precisely generate a pulse. + This hardware is present on 2019 and newer Intel CPUs. However, this + driver is not useful without adding highly specialized hardware outside + the Linux system to observe these pulses. + + To compile this driver as a module, choose M here: the module + will be called pps_gen_tio. + + If unsure, say N. diff --git a/drivers/pps/generators/Makefile b/drivers/pps/generators/Makefile index 2589fd0f2481..714e847ae193 100644 --- a/drivers/pps/generators/Makefile +++ b/drivers/pps/generators/Makefile @@ -4,5 +4,6 @@ # obj-$(CONFIG_PPS_GENERATOR_PARPORT) += pps_gen_parport.o +obj-$(CONFIG_PPS_GENERATOR_TIO) += pps_gen_tio.o ccflags-$(CONFIG_PPS_DEBUG) := -DDEBUG diff --git a/drivers/pps/generators/pps_gen_tio.c b/drivers/pps/generators/pps_gen_tio.c new file mode 100644 index 000000000000..74c2a92eddb8 --- /dev/null +++ b/drivers/pps/generators/pps_gen_tio.c @@ -0,0 +1,258 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Intel PPS signal Generator Driver + * + * Copyright (C) 2023 Intel Corporation + */ + +#include <linux/bits.h> +#include <linux/bitfield.h> +#include <linux/cleanup.h> +#include <linux/container_of.h> +#include <linux/cpu.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/hrtimer.h> +#include <linux/io-64-nonatomic-hi-lo.h> +#include <linux/kstrtox.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/spinlock.h> +#include <linux/sysfs.h> +#include <linux/timekeeping.h> +#include <linux/types.h> + +#include <asm/cpu_device_id.h> + +#define TIOCTL 0x00 +#define TIOCOMPV 0x10 +#define TIOEC 0x30 + +/* Control Register */ +#define TIOCTL_EN BIT(0) +#define TIOCTL_DIR BIT(1) +#define TIOCTL_EP GENMASK(3, 2) +#define TIOCTL_EP_RISING_EDGE FIELD_PREP(TIOCTL_EP, 0) +#define TIOCTL_EP_FALLING_EDGE FIELD_PREP(TIOCTL_EP, 1) +#define TIOCTL_EP_TOGGLE_EDGE FIELD_PREP(TIOCTL_EP, 2) + +#define SAFE_TIME_NS (10 * NSEC_PER_MSEC) /* Safety time to set hrtimer early */ +#define MAGIC_CONST (NSEC_PER_SEC - SAFE_TIME_NS) +#define ART_HW_DELAY_CYCLES 2 + +struct pps_tio { + struct hrtimer timer; + struct device *dev; + spinlock_t lock; + struct attribute_group attrs; + void __iomem *base; + bool enabled; + u32 prev_count; +}; + +static inline u32 pps_tio_read(struct pps_tio *tio, u32 offset) +{ + return readl(tio->base + offset); +} + +static inline void pps_ctl_write(struct pps_tio *tio, u32 value) +{ + writel(value, tio->base + TIOCTL); +} + +/* For COMPV register, It's safer to write higher 32-bit followed by lower 32-bit */ +static inline void pps_compv_write(struct pps_tio *tio, u64 value) +{ + hi_lo_writeq(value, tio->base + TIOCOMPV); +} + +static inline ktime_t first_event(struct pps_tio *tio) +{ + return ktime_set(ktime_get_real_seconds() + 1, MAGIC_CONST); +} + +static u32 pps_tio_disable(struct pps_tio *tio) +{ + u32 ctrl; + + ctrl = pps_tio_read(tio, TIOCTL); + pps_compv_write(tio, 0); + + ctrl &= ~TIOCTL_EN; + pps_ctl_write(tio, ctrl); + tio->prev_count = 0; + + return ctrl; +} + +static void pps_tio_direction_output(struct pps_tio *tio) +{ + u32 ctrl; + + ctrl = pps_tio_disable(tio); + + /* We enable the device, be sure that the 'compare' value is invalid */ + pps_compv_write(tio, 0); + + ctrl &= ~(TIOCTL_DIR | TIOCTL_EP); + ctrl |= TIOCTL_EP_TOGGLE_EDGE; + pps_ctl_write(tio, ctrl); + + ctrl |= TIOCTL_EN; + pps_ctl_write(tio, ctrl); +} + +static bool pps_generate_next_pulse(struct pps_tio *tio, ktime_t expires) +{ + u64 art; + + if (!ktime_real_to_base_clock(expires, CSID_X86_ART, &art)) { + pps_tio_disable(tio); + return false; + } + + pps_compv_write(tio, art - ART_HW_DELAY_CYCLES); + return true; +} + +static enum hrtimer_restart hrtimer_callback(struct hrtimer *timer) +{ + struct pps_tio *tio = container_of(timer, struct pps_tio, timer); + ktime_t expires, now; + u32 event_count; + + guard(spinlock)(&tio->lock); + + /* Check if any event is missed. If an event is missed, TIO will be disabled*/ + event_count = pps_tio_read(tio, TIOEC); + if (!tio->prev_count && tio->prev_count == event_count) + goto err; + tio->prev_count = event_count; + expires = hrtimer_get_expires(timer); + now = ktime_get_real(); + + if (now - expires < SAFE_TIME_NS) { + if (!pps_generate_next_pulse(tio, expires + SAFE_TIME_NS)) + goto err; + } + + hrtimer_forward(timer, now, NSEC_PER_SEC / 2); + return HRTIMER_RESTART; +err: + dev_err(tio->dev, "Event missed, Disabling Timed I/O"); + pps_tio_disable(tio); + return HRTIMER_NORESTART; +} + +static ssize_t enable_store(struct device *dev, struct device_attribute *attr, const char *buf, + size_t count) +{ + struct pps_tio *tio = dev_get_drvdata(dev); + bool enable; + int err; + + err = kstrtobool(buf, &enable); + if (err) + return err; + + guard(spinlock_irqsave)(&tio->lock); + if (enable && !tio->enabled) { + if (!timekeeping_clocksource_has_base(CSID_X86_ART)) { + dev_err(tio->dev, "PPS cannot be started as clock is not related to ART"); + return -EPERM; + } + pps_tio_direction_output(tio); + hrtimer_start(&tio->timer, first_event(tio), HRTIMER_MODE_ABS); + tio->enabled = true; + } else if (!enable && tio->enabled) { + hrtimer_cancel(&tio->timer); + pps_tio_disable(tio); + tio->enabled = false; + } + return count; +} + +static ssize_t enable_show(struct device *dev, struct device_attribute *devattr, char *buf) +{ + struct pps_tio *tio = dev_get_drvdata(dev); + u32 ctrl; + + ctrl = pps_tio_read(tio, TIOCTL); + ctrl &= TIOCTL_EN; + + return sysfs_emit(buf, "%u\n", ctrl); +} +static DEVICE_ATTR_RW(enable); + +static struct attribute *pps_tio_attrs[] = { + &dev_attr_enable.attr, + NULL +}; +ATTRIBUTE_GROUPS(pps_tio); + +static int pps_tio_probe(struct platform_device *pdev) +{ + struct pps_tio *tio; + + if (!(cpu_feature_enabled(X86_FEATURE_TSC_KNOWN_FREQ) && + cpu_feature_enabled(X86_FEATURE_ART))) { + dev_warn(&pdev->dev, "TSC/ART is not enabled"); + return -ENODEV; + } + + tio = devm_kzalloc(&pdev->dev, sizeof(*tio), GFP_KERNEL); + if (!tio) + return -ENOMEM; + + tio->dev = &pdev->dev; + tio->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(tio->base)) + return PTR_ERR(tio->base); + + pps_tio_disable(tio); + hrtimer_init(&tio->timer, CLOCK_REALTIME, HRTIMER_MODE_ABS); + tio->timer.function = hrtimer_callback; + spin_lock_init(&tio->lock); + tio->enabled = false; + platform_set_drvdata(pdev, tio); + + return 0; +} + +static int pps_tio_remove(struct platform_device *pdev) +{ + struct pps_tio *tio = platform_get_drvdata(pdev); + + hrtimer_cancel(&tio->timer); + pps_tio_disable(tio); + + return 0; +} + +static const struct acpi_device_id intel_pmc_tio_acpi_match[] = { + { "INTC1021" }, + { "INTC1022" }, + { "INTC1023" }, + { "INTC1024" }, + {} +}; +MODULE_DEVICE_TABLE(acpi, intel_pmc_tio_acpi_match); + +static struct platform_driver pps_tio_driver = { + .probe = pps_tio_probe, + .remove = pps_tio_remove, + .driver = { + .name = "intel-pps-generator", + .acpi_match_table = intel_pmc_tio_acpi_match, + .dev_groups = pps_tio_groups, + }, +}; +module_platform_driver(pps_tio_driver); + +MODULE_AUTHOR("Lakshmi Sowjanya D <lakshmi.sowjanya.d@intel.com>"); +MODULE_AUTHOR("Christopher Hall <christopher.s.hall@intel.com>"); +MODULE_AUTHOR("Pandith N <pandith.n@intel.com>"); +MODULE_AUTHOR("Thejesh Reddy T R <thejesh.reddy.t.r@intel.com>"); +MODULE_DESCRIPTION("Intel PMC Time-Aware IO Generator Driver"); +MODULE_LICENSE("GPL"); -- 2.35.3
WARNING: multiple messages have this Message-ID (diff)
From: lakshmi.sowjanya.d@intel.com To: tglx@linutronix.de, jstultz@google.com, giometti@enneenne.com, corbet@lwn.net, linux-kernel@vger.kernel.org Cc: christopher.s.hall@intel.com, subramanian.mohan@intel.com, lakshmi.sowjanya.d@intel.com, linux-doc@vger.kernel.org, netdev@vger.kernel.org, pandith.n@intel.com, x86@kernel.org, eddie.dong@intel.com, linux-sound@vger.kernel.org, alexandre.torgue@foss.st.com, peter.hilber@opensynergy.com, joabreu@synopsys.com, intel-wired-lan@lists.osuosl.org, mcoquelin.stm32@gmail.com, thejesh.reddy.t.r@intel.com, perex@perex.cz, anthony.l.nguyen@intel.com, andriy.shevchenko@linux.intel.com, davem@davemloft.net Subject: [Intel-wired-lan] [PATCH v6 09/11] pps: generators: Add PPS Generator TIO Driver Date: Wed, 10 Apr 2024 17:18:26 +0530 [thread overview] Message-ID: <20240410114828.25581-10-lakshmi.sowjanya.d@intel.com> (raw) In-Reply-To: <20240410114828.25581-1-lakshmi.sowjanya.d@intel.com> From: Lakshmi Sowjanya D <lakshmi.sowjanya.d@intel.com> The Intel Timed IO PPS generator driver outputs a PPS signal using dedicated hardware that is more accurate than software actuated PPS. The Timed IO hardware generates output events using the ART timer. The ART timer period varies based on platform type, but is less than 100 nanoseconds for all current platforms. Timed IO output accuracy is within 1 ART period. PPS output is enabled by writing '1' the 'enable' sysfs attribute. The driver uses hrtimers to schedule a wake-up 10 ms before each event (edge) target time. At wakeup, the driver converts the target time in terms of CLOCK_REALTIME to ART trigger time and writes this to the Timed IO hardware. The Timed IO hardware generates an event precisely at the requested system time without software involvement. Co-developed-by: Christopher Hall <christopher.s.hall@intel.com> Signed-off-by: Christopher Hall <christopher.s.hall@intel.com> Co-developed-by: Pandith N <pandith.n@intel.com> Signed-off-by: Pandith N <pandith.n@intel.com> Co-developed-by: Thejesh Reddy T R <thejesh.reddy.t.r@intel.com> Signed-off-by: Thejesh Reddy T R <thejesh.reddy.t.r@intel.com> Signed-off-by: Lakshmi Sowjanya D <lakshmi.sowjanya.d@intel.com> Reviewed-by: Eddie Dong <eddie.dong@intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Rodolfo Giometti <giometti@enneenne.com> --- drivers/pps/generators/Kconfig | 16 ++ drivers/pps/generators/Makefile | 1 + drivers/pps/generators/pps_gen_tio.c | 258 +++++++++++++++++++++++++++ 3 files changed, 275 insertions(+) create mode 100644 drivers/pps/generators/pps_gen_tio.c diff --git a/drivers/pps/generators/Kconfig b/drivers/pps/generators/Kconfig index d615e640fcad..0f090932336f 100644 --- a/drivers/pps/generators/Kconfig +++ b/drivers/pps/generators/Kconfig @@ -12,3 +12,19 @@ config PPS_GENERATOR_PARPORT If you say yes here you get support for a PPS signal generator which utilizes STROBE pin of a parallel port to send PPS signals. It uses parport abstraction layer and hrtimers to precisely control the signal. + +config PPS_GENERATOR_TIO + tristate "TIO PPS signal generator" + depends on X86 && CPU_SUP_INTEL + help + If you say yes here you get support for a PPS TIO signal generator + which generates a pulse at a prescribed time based on the system clock. + It uses time translation and hrtimers to precisely generate a pulse. + This hardware is present on 2019 and newer Intel CPUs. However, this + driver is not useful without adding highly specialized hardware outside + the Linux system to observe these pulses. + + To compile this driver as a module, choose M here: the module + will be called pps_gen_tio. + + If unsure, say N. diff --git a/drivers/pps/generators/Makefile b/drivers/pps/generators/Makefile index 2589fd0f2481..714e847ae193 100644 --- a/drivers/pps/generators/Makefile +++ b/drivers/pps/generators/Makefile @@ -4,5 +4,6 @@ # obj-$(CONFIG_PPS_GENERATOR_PARPORT) += pps_gen_parport.o +obj-$(CONFIG_PPS_GENERATOR_TIO) += pps_gen_tio.o ccflags-$(CONFIG_PPS_DEBUG) := -DDEBUG diff --git a/drivers/pps/generators/pps_gen_tio.c b/drivers/pps/generators/pps_gen_tio.c new file mode 100644 index 000000000000..74c2a92eddb8 --- /dev/null +++ b/drivers/pps/generators/pps_gen_tio.c @@ -0,0 +1,258 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Intel PPS signal Generator Driver + * + * Copyright (C) 2023 Intel Corporation + */ + +#include <linux/bits.h> +#include <linux/bitfield.h> +#include <linux/cleanup.h> +#include <linux/container_of.h> +#include <linux/cpu.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/hrtimer.h> +#include <linux/io-64-nonatomic-hi-lo.h> +#include <linux/kstrtox.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/spinlock.h> +#include <linux/sysfs.h> +#include <linux/timekeeping.h> +#include <linux/types.h> + +#include <asm/cpu_device_id.h> + +#define TIOCTL 0x00 +#define TIOCOMPV 0x10 +#define TIOEC 0x30 + +/* Control Register */ +#define TIOCTL_EN BIT(0) +#define TIOCTL_DIR BIT(1) +#define TIOCTL_EP GENMASK(3, 2) +#define TIOCTL_EP_RISING_EDGE FIELD_PREP(TIOCTL_EP, 0) +#define TIOCTL_EP_FALLING_EDGE FIELD_PREP(TIOCTL_EP, 1) +#define TIOCTL_EP_TOGGLE_EDGE FIELD_PREP(TIOCTL_EP, 2) + +#define SAFE_TIME_NS (10 * NSEC_PER_MSEC) /* Safety time to set hrtimer early */ +#define MAGIC_CONST (NSEC_PER_SEC - SAFE_TIME_NS) +#define ART_HW_DELAY_CYCLES 2 + +struct pps_tio { + struct hrtimer timer; + struct device *dev; + spinlock_t lock; + struct attribute_group attrs; + void __iomem *base; + bool enabled; + u32 prev_count; +}; + +static inline u32 pps_tio_read(struct pps_tio *tio, u32 offset) +{ + return readl(tio->base + offset); +} + +static inline void pps_ctl_write(struct pps_tio *tio, u32 value) +{ + writel(value, tio->base + TIOCTL); +} + +/* For COMPV register, It's safer to write higher 32-bit followed by lower 32-bit */ +static inline void pps_compv_write(struct pps_tio *tio, u64 value) +{ + hi_lo_writeq(value, tio->base + TIOCOMPV); +} + +static inline ktime_t first_event(struct pps_tio *tio) +{ + return ktime_set(ktime_get_real_seconds() + 1, MAGIC_CONST); +} + +static u32 pps_tio_disable(struct pps_tio *tio) +{ + u32 ctrl; + + ctrl = pps_tio_read(tio, TIOCTL); + pps_compv_write(tio, 0); + + ctrl &= ~TIOCTL_EN; + pps_ctl_write(tio, ctrl); + tio->prev_count = 0; + + return ctrl; +} + +static void pps_tio_direction_output(struct pps_tio *tio) +{ + u32 ctrl; + + ctrl = pps_tio_disable(tio); + + /* We enable the device, be sure that the 'compare' value is invalid */ + pps_compv_write(tio, 0); + + ctrl &= ~(TIOCTL_DIR | TIOCTL_EP); + ctrl |= TIOCTL_EP_TOGGLE_EDGE; + pps_ctl_write(tio, ctrl); + + ctrl |= TIOCTL_EN; + pps_ctl_write(tio, ctrl); +} + +static bool pps_generate_next_pulse(struct pps_tio *tio, ktime_t expires) +{ + u64 art; + + if (!ktime_real_to_base_clock(expires, CSID_X86_ART, &art)) { + pps_tio_disable(tio); + return false; + } + + pps_compv_write(tio, art - ART_HW_DELAY_CYCLES); + return true; +} + +static enum hrtimer_restart hrtimer_callback(struct hrtimer *timer) +{ + struct pps_tio *tio = container_of(timer, struct pps_tio, timer); + ktime_t expires, now; + u32 event_count; + + guard(spinlock)(&tio->lock); + + /* Check if any event is missed. If an event is missed, TIO will be disabled*/ + event_count = pps_tio_read(tio, TIOEC); + if (!tio->prev_count && tio->prev_count == event_count) + goto err; + tio->prev_count = event_count; + expires = hrtimer_get_expires(timer); + now = ktime_get_real(); + + if (now - expires < SAFE_TIME_NS) { + if (!pps_generate_next_pulse(tio, expires + SAFE_TIME_NS)) + goto err; + } + + hrtimer_forward(timer, now, NSEC_PER_SEC / 2); + return HRTIMER_RESTART; +err: + dev_err(tio->dev, "Event missed, Disabling Timed I/O"); + pps_tio_disable(tio); + return HRTIMER_NORESTART; +} + +static ssize_t enable_store(struct device *dev, struct device_attribute *attr, const char *buf, + size_t count) +{ + struct pps_tio *tio = dev_get_drvdata(dev); + bool enable; + int err; + + err = kstrtobool(buf, &enable); + if (err) + return err; + + guard(spinlock_irqsave)(&tio->lock); + if (enable && !tio->enabled) { + if (!timekeeping_clocksource_has_base(CSID_X86_ART)) { + dev_err(tio->dev, "PPS cannot be started as clock is not related to ART"); + return -EPERM; + } + pps_tio_direction_output(tio); + hrtimer_start(&tio->timer, first_event(tio), HRTIMER_MODE_ABS); + tio->enabled = true; + } else if (!enable && tio->enabled) { + hrtimer_cancel(&tio->timer); + pps_tio_disable(tio); + tio->enabled = false; + } + return count; +} + +static ssize_t enable_show(struct device *dev, struct device_attribute *devattr, char *buf) +{ + struct pps_tio *tio = dev_get_drvdata(dev); + u32 ctrl; + + ctrl = pps_tio_read(tio, TIOCTL); + ctrl &= TIOCTL_EN; + + return sysfs_emit(buf, "%u\n", ctrl); +} +static DEVICE_ATTR_RW(enable); + +static struct attribute *pps_tio_attrs[] = { + &dev_attr_enable.attr, + NULL +}; +ATTRIBUTE_GROUPS(pps_tio); + +static int pps_tio_probe(struct platform_device *pdev) +{ + struct pps_tio *tio; + + if (!(cpu_feature_enabled(X86_FEATURE_TSC_KNOWN_FREQ) && + cpu_feature_enabled(X86_FEATURE_ART))) { + dev_warn(&pdev->dev, "TSC/ART is not enabled"); + return -ENODEV; + } + + tio = devm_kzalloc(&pdev->dev, sizeof(*tio), GFP_KERNEL); + if (!tio) + return -ENOMEM; + + tio->dev = &pdev->dev; + tio->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(tio->base)) + return PTR_ERR(tio->base); + + pps_tio_disable(tio); + hrtimer_init(&tio->timer, CLOCK_REALTIME, HRTIMER_MODE_ABS); + tio->timer.function = hrtimer_callback; + spin_lock_init(&tio->lock); + tio->enabled = false; + platform_set_drvdata(pdev, tio); + + return 0; +} + +static int pps_tio_remove(struct platform_device *pdev) +{ + struct pps_tio *tio = platform_get_drvdata(pdev); + + hrtimer_cancel(&tio->timer); + pps_tio_disable(tio); + + return 0; +} + +static const struct acpi_device_id intel_pmc_tio_acpi_match[] = { + { "INTC1021" }, + { "INTC1022" }, + { "INTC1023" }, + { "INTC1024" }, + {} +}; +MODULE_DEVICE_TABLE(acpi, intel_pmc_tio_acpi_match); + +static struct platform_driver pps_tio_driver = { + .probe = pps_tio_probe, + .remove = pps_tio_remove, + .driver = { + .name = "intel-pps-generator", + .acpi_match_table = intel_pmc_tio_acpi_match, + .dev_groups = pps_tio_groups, + }, +}; +module_platform_driver(pps_tio_driver); + +MODULE_AUTHOR("Lakshmi Sowjanya D <lakshmi.sowjanya.d@intel.com>"); +MODULE_AUTHOR("Christopher Hall <christopher.s.hall@intel.com>"); +MODULE_AUTHOR("Pandith N <pandith.n@intel.com>"); +MODULE_AUTHOR("Thejesh Reddy T R <thejesh.reddy.t.r@intel.com>"); +MODULE_DESCRIPTION("Intel PMC Time-Aware IO Generator Driver"); +MODULE_LICENSE("GPL"); -- 2.35.3
next prev parent reply other threads:[~2024-04-10 11:49 UTC|newest] Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-04-10 11:48 [PATCH v6 00/11] Add support for Intel PPS Generator lakshmi.sowjanya.d 2024-04-10 11:48 ` [Intel-wired-lan] " lakshmi.sowjanya.d 2024-04-10 11:48 ` [PATCH v6 01/11] x86/tsc: Add base clock properties in clocksource structure lakshmi.sowjanya.d 2024-04-10 11:48 ` [Intel-wired-lan] " lakshmi.sowjanya.d 2024-04-10 21:20 ` Thomas Gleixner 2024-04-10 21:20 ` [Intel-wired-lan] " Thomas Gleixner 2024-04-16 10:10 ` D, Lakshmi Sowjanya 2024-04-16 10:10 ` [Intel-wired-lan] " D, Lakshmi Sowjanya 2024-04-10 21:32 ` Thomas Gleixner 2024-04-10 21:32 ` [Intel-wired-lan] " Thomas Gleixner 2024-04-16 10:11 ` D, Lakshmi Sowjanya 2024-04-16 10:11 ` [Intel-wired-lan] " D, Lakshmi Sowjanya 2024-04-10 11:48 ` [PATCH v6 02/11] e1000e: remove convert_art_to_tsc() lakshmi.sowjanya.d 2024-04-10 11:48 ` [Intel-wired-lan] " lakshmi.sowjanya.d 2024-04-10 21:42 ` Thomas Gleixner 2024-04-10 21:42 ` [Intel-wired-lan] " Thomas Gleixner 2024-04-10 11:48 ` [Intel-wired-lan] [PATCH v6 03/11] igc: " lakshmi.sowjanya.d 2024-04-10 11:48 ` lakshmi.sowjanya.d 2024-04-10 11:48 ` [PATCH v6 04/11] stmmac: intel: " lakshmi.sowjanya.d 2024-04-10 11:48 ` [Intel-wired-lan] " lakshmi.sowjanya.d 2024-04-10 11:48 ` [PATCH v6 05/11] ALSA: hda: " lakshmi.sowjanya.d 2024-04-10 11:48 ` [Intel-wired-lan] " lakshmi.sowjanya.d 2024-04-10 11:48 ` [PATCH v6 06/11] ice/ptp: " lakshmi.sowjanya.d 2024-04-10 11:48 ` [Intel-wired-lan] " lakshmi.sowjanya.d 2024-04-10 11:48 ` [PATCH v6 07/11] x86/tsc: Remove art to tsc conversion functions which are obsolete lakshmi.sowjanya.d 2024-04-10 11:48 ` [Intel-wired-lan] " lakshmi.sowjanya.d 2024-04-10 11:48 ` [PATCH v6 08/11] timekeeping: Add function to convert realtime to base clock lakshmi.sowjanya.d 2024-04-10 11:48 ` [Intel-wired-lan] " lakshmi.sowjanya.d 2024-04-10 22:15 ` Thomas Gleixner 2024-04-10 22:15 ` [Intel-wired-lan] " Thomas Gleixner 2024-04-16 10:17 ` D, Lakshmi Sowjanya 2024-04-16 10:17 ` [Intel-wired-lan] " D, Lakshmi Sowjanya 2024-04-10 11:48 ` lakshmi.sowjanya.d [this message] 2024-04-10 11:48 ` [Intel-wired-lan] [PATCH v6 09/11] pps: generators: Add PPS Generator TIO Driver lakshmi.sowjanya.d 2024-04-10 22:28 ` Thomas Gleixner 2024-04-10 22:28 ` [Intel-wired-lan] " Thomas Gleixner 2024-04-16 10:19 ` D, Lakshmi Sowjanya 2024-04-16 10:19 ` [Intel-wired-lan] " D, Lakshmi Sowjanya 2024-04-10 11:48 ` [PATCH v6 10/11] Documentation: driver-api: pps: Add Intel Timed I/O PPS generator lakshmi.sowjanya.d 2024-04-10 11:48 ` [Intel-wired-lan] " lakshmi.sowjanya.d 2024-04-10 11:48 ` [PATCH v6 11/11] ABI: pps: Add ABI documentation for Intel TIO lakshmi.sowjanya.d 2024-04-10 11:48 ` [Intel-wired-lan] " lakshmi.sowjanya.d 2024-04-10 13:59 ` Andy Shevchenko 2024-04-10 13:59 ` [Intel-wired-lan] " Andy Shevchenko
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