diff options
Diffstat (limited to 'drivers/ptp')
| -rw-r--r-- | drivers/ptp/Kconfig | 75 | ||||
| -rw-r--r-- | drivers/ptp/Makefile | 7 | ||||
| -rw-r--r-- | drivers/ptp/ptp_chardev.c | 159 | ||||
| -rw-r--r-- | drivers/ptp/ptp_clock.c | 343 | ||||
| -rw-r--r-- | drivers/ptp/ptp_ixp46x.c | 332 | ||||
| -rw-r--r-- | drivers/ptp/ptp_private.h | 92 | ||||
| -rw-r--r-- | drivers/ptp/ptp_sysfs.c | 230 |
7 files changed, 1238 insertions, 0 deletions
diff --git a/drivers/ptp/Kconfig b/drivers/ptp/Kconfig new file mode 100644 index 000000000000..68d720102296 --- /dev/null +++ b/drivers/ptp/Kconfig @@ -0,0 +1,75 @@ +# +# PTP clock support configuration +# + +menu "PTP clock support" + +comment "Enable Device Drivers -> PPS to see the PTP clock options." + depends on PPS=n + +config PTP_1588_CLOCK + tristate "PTP clock support" + depends on EXPERIMENTAL + depends on PPS + help + The IEEE 1588 standard defines a method to precisely + synchronize distributed clocks over Ethernet networks. The + standard defines a Precision Time Protocol (PTP), which can + be used to achieve synchronization within a few dozen + microseconds. In addition, with the help of special hardware + time stamping units, it can be possible to achieve + synchronization to within a few hundred nanoseconds. + + This driver adds support for PTP clocks as character + devices. If you want to use a PTP clock, then you should + also enable at least one clock driver as well. + + To compile this driver as a module, choose M here: the module + will be called ptp. + +config PTP_1588_CLOCK_GIANFAR + tristate "Freescale eTSEC as PTP clock" + depends on PTP_1588_CLOCK + depends on GIANFAR + help + This driver adds support for using the eTSEC as a PTP + clock. This clock is only useful if your PTP programs are + getting hardware time stamps on the PTP Ethernet packets + using the SO_TIMESTAMPING API. + + To compile this driver as a module, choose M here: the module + will be called gianfar_ptp. + +config PTP_1588_CLOCK_IXP46X + tristate "Intel IXP46x as PTP clock" + depends on PTP_1588_CLOCK + depends on IXP4XX_ETH + help + This driver adds support for using the IXP46X as a PTP + clock. This clock is only useful if your PTP programs are + getting hardware time stamps on the PTP Ethernet packets + using the SO_TIMESTAMPING API. + + To compile this driver as a module, choose M here: the module + will be called ptp_ixp46x. + +comment "Enable PHYLIB and NETWORK_PHY_TIMESTAMPING to see the additional clocks." + depends on PTP_1588_CLOCK && (PHYLIB=n || NETWORK_PHY_TIMESTAMPING=n) + +config DP83640_PHY + tristate "Driver for the National Semiconductor DP83640 PHYTER" + depends on PTP_1588_CLOCK + depends on NETWORK_PHY_TIMESTAMPING + depends on PHYLIB + ---help--- + Supports the DP83640 PHYTER with IEEE 1588 features. + + This driver adds support for using the DP83640 as a PTP + clock. This clock is only useful if your PTP programs are + getting hardware time stamps on the PTP Ethernet packets + using the SO_TIMESTAMPING API. + + In order for this to work, your MAC driver must also + implement the skb_tx_timetamp() function. + +endmenu diff --git a/drivers/ptp/Makefile b/drivers/ptp/Makefile new file mode 100644 index 000000000000..f6933e83de72 --- /dev/null +++ b/drivers/ptp/Makefile @@ -0,0 +1,7 @@ +# +# Makefile for PTP 1588 clock support. +# + +ptp-y := ptp_clock.o ptp_chardev.o ptp_sysfs.o +obj-$(CONFIG_PTP_1588_CLOCK) += ptp.o +obj-$(CONFIG_PTP_1588_CLOCK_IXP46X) += ptp_ixp46x.o diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c new file mode 100644 index 000000000000..a8d03aeb4051 --- /dev/null +++ b/drivers/ptp/ptp_chardev.c @@ -0,0 +1,159 @@ +/* + * PTP 1588 clock support - character device implementation. + * + * Copyright (C) 2010 OMICRON electronics GmbH + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ +#include <linux/module.h> +#include <linux/posix-clock.h> +#include <linux/poll.h> +#include <linux/sched.h> + +#include "ptp_private.h" + +int ptp_open(struct posix_clock *pc, fmode_t fmode) +{ + return 0; +} + +long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg) +{ + struct ptp_clock_caps caps; + struct ptp_clock_request req; + struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); + struct ptp_clock_info *ops = ptp->info; + int enable, err = 0; + + switch (cmd) { + + case PTP_CLOCK_GETCAPS: + memset(&caps, 0, sizeof(caps)); + caps.max_adj = ptp->info->max_adj; + caps.n_alarm = ptp->info->n_alarm; + caps.n_ext_ts = ptp->info->n_ext_ts; + caps.n_per_out = ptp->info->n_per_out; + caps.pps = ptp->info->pps; + err = copy_to_user((void __user *)arg, &caps, sizeof(caps)); + break; + + case PTP_EXTTS_REQUEST: + if (copy_from_user(&req.extts, (void __user *)arg, + sizeof(req.extts))) { + err = -EFAULT; + break; + } + if (req.extts.index >= ops->n_ext_ts) { + err = -EINVAL; + break; + } + req.type = PTP_CLK_REQ_EXTTS; + enable = req.extts.flags & PTP_ENABLE_FEATURE ? 1 : 0; + err = ops->enable(ops, &req, enable); + break; + + case PTP_PEROUT_REQUEST: + if (copy_from_user(&req.perout, (void __user *)arg, + sizeof(req.perout))) { + err = -EFAULT; + break; + } + if (req.perout.index >= ops->n_per_out) { + err = -EINVAL; + break; + } + req.type = PTP_CLK_REQ_PEROUT; + enable = req.perout.period.sec || req.perout.period.nsec; + err = ops->enable(ops, &req, enable); + break; + + case PTP_ENABLE_PPS: + if (!capable(CAP_SYS_TIME)) + return -EPERM; + req.type = PTP_CLK_REQ_PPS; + enable = arg ? 1 : 0; + err = ops->enable(ops, &req, enable); + break; + + default: + err = -ENOTTY; + break; + } + return err; +} + +unsigned int ptp_poll(struct posix_clock *pc, struct file *fp, poll_table *wait) +{ + struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); + + poll_wait(fp, &ptp->tsev_wq, wait); + + return queue_cnt(&ptp->tsevq) ? POLLIN : 0; +} + +ssize_t ptp_read(struct posix_clock *pc, + uint rdflags, char __user *buf, size_t cnt) +{ + struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); + struct timestamp_event_queue *queue = &ptp->tsevq; + struct ptp_extts_event event[PTP_BUF_TIMESTAMPS]; + unsigned long flags; + size_t qcnt, i; + + if (cnt % sizeof(struct ptp_extts_event) != 0) + return -EINVAL; + + if (cnt > sizeof(event)) + cnt = sizeof(event); + + cnt = cnt / sizeof(struct ptp_extts_event); + + if (mutex_lock_interruptible(&ptp->tsevq_mux)) + return -ERESTARTSYS; + + if (wait_event_interruptible(ptp->tsev_wq, + ptp->defunct || queue_cnt(queue))) { + mutex_unlock(&ptp->tsevq_mux); + return -ERESTARTSYS; + } + + if (ptp->defunct) + return -ENODEV; + + spin_lock_irqsave(&queue->lock, flags); + + qcnt = queue_cnt(queue); + + if (cnt > qcnt) + cnt = qcnt; + + for (i = 0; i < cnt; i++) { + event[i] = queue->buf[queue->head]; + queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS; + } + + spin_unlock_irqrestore(&queue->lock, flags); + + cnt = cnt * sizeof(struct ptp_extts_event); + + mutex_unlock(&ptp->tsevq_mux); + + if (copy_to_user(buf, event, cnt)) { + mutex_unlock(&ptp->tsevq_mux); + return -EFAULT; + } + + return cnt; +} diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c new file mode 100644 index 000000000000..cf3f9997546d --- /dev/null +++ b/drivers/ptp/ptp_clock.c @@ -0,0 +1,343 @@ +/* + * PTP 1588 clock support + * + * Copyright (C) 2010 OMICRON electronics GmbH + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ +#include <linux/bitops.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/posix-clock.h> +#include <linux/pps_kernel.h> +#include <linux/slab.h> +#include <linux/syscalls.h> +#include <linux/uaccess.h> + +#include "ptp_private.h" + +#define PTP_MAX_ALARMS 4 +#define PTP_MAX_CLOCKS 8 +#define PTP_PPS_DEFAULTS (PPS_CAPTUREASSERT | PPS_OFFSETASSERT) +#define PTP_PPS_EVENT PPS_CAPTUREASSERT +#define PTP_PPS_MODE (PTP_PPS_DEFAULTS | PPS_CANWAIT | PPS_TSFMT_TSPEC) + +/* private globals */ + +static dev_t ptp_devt; +static struct class *ptp_class; + +static DECLARE_BITMAP(ptp_clocks_map, PTP_MAX_CLOCKS); +static DEFINE_MUTEX(ptp_clocks_mutex); /* protects 'ptp_clocks_map' */ + +/* time stamp event queue operations */ + +static inline int queue_free(struct timestamp_event_queue *q) +{ + return PTP_MAX_TIMESTAMPS - queue_cnt(q) - 1; +} + +static void enqueue_external_timestamp(struct timestamp_event_queue *queue, + struct ptp_clock_event *src) +{ + struct ptp_extts_event *dst; + unsigned long flags; + s64 seconds; + u32 remainder; + + seconds = div_u64_rem(src->timestamp, 1000000000, &remainder); + + spin_lock_irqsave(&queue->lock, flags); + + dst = &queue->buf[queue->tail]; + dst->index = src->index; + dst->t.sec = seconds; + dst->t.nsec = remainder; + + if (!queue_free(queue)) + queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS; + + queue->tail = (queue->tail + 1) % PTP_MAX_TIMESTAMPS; + + spin_unlock_irqrestore(&queue->lock, flags); +} + +static s32 scaled_ppm_to_ppb(long ppm) +{ + /* + * The 'freq' field in the 'struct timex' is in parts per + * million, but with a 16 bit binary fractional field. + * + * We want to calculate + * + * ppb = scaled_ppm * 1000 / 2^16 + * + * which simplifies to + * + * ppb = scaled_ppm * 125 / 2^13 + */ + s64 ppb = 1 + ppm; + ppb *= 125; + ppb >>= 13; + return (s32) ppb; +} + +/* posix clock implementation */ + +static int ptp_clock_getres(struct posix_clock *pc, struct timespec *tp) +{ + return 1; /* always round timer functions to one nanosecond */ +} + +static int ptp_clock_settime(struct posix_clock *pc, const struct timespec *tp) +{ + struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); + return ptp->info->settime(ptp->info, tp); +} + +static int ptp_clock_gettime(struct posix_clock *pc, struct timespec *tp) +{ + struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); + return ptp->info->gettime(ptp->info, tp); +} + +static int ptp_clock_adjtime(struct posix_clock *pc, struct timex *tx) +{ + struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); + struct ptp_clock_info *ops; + int err = -EOPNOTSUPP; + + ops = ptp->info; + + if (tx->modes & ADJ_SETOFFSET) { + struct timespec ts; + ktime_t kt; + s64 delta; + + ts.tv_sec = tx->time.tv_sec; + ts.tv_nsec = tx->time.tv_usec; + + if (!(tx->modes & ADJ_NANO)) + ts.tv_nsec *= 1000; + + if ((unsigned long) ts.tv_nsec >= NSEC_PER_SEC) + return -EINVAL; + + kt = timespec_to_ktime(ts); + delta = ktime_to_ns(kt); + err = ops->adjtime(ops, delta); + + } else if (tx->modes & ADJ_FREQUENCY) { + + err = ops->adjfreq(ops, scaled_ppm_to_ppb(tx->freq)); + } + + return err; +} + +static struct posix_clock_operations ptp_clock_ops = { + .owner = THIS_MODULE, + .clock_adjtime = ptp_clock_adjtime, + .clock_gettime = ptp_clock_gettime, + .clock_getres = ptp_clock_getres, + .clock_settime = ptp_clock_settime, + .ioctl = ptp_ioctl, + .open = ptp_open, + .poll = ptp_poll, + .read = ptp_read, +}; + +static void delete_ptp_clock(struct posix_clock *pc) +{ + struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); + + mutex_destroy(&ptp->tsevq_mux); + + /* Remove the clock from the bit map. */ + mutex_lock(&ptp_clocks_mutex); + clear_bit(ptp->index, ptp_clocks_map); + mutex_unlock(&ptp_clocks_mutex); + + kfree(ptp); +} + +/* public interface */ + +struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info) +{ + struct ptp_clock *ptp; + int err = 0, index, major = MAJOR(ptp_devt); + + if (info->n_alarm > PTP_MAX_ALARMS) + return ERR_PTR(-EINVAL); + + /* Find a free clock slot and reserve it. */ + err = -EBUSY; + mutex_lock(&ptp_clocks_mutex); + index = find_first_zero_bit(ptp_clocks_map, PTP_MAX_CLOCKS); + if (index < PTP_MAX_CLOCKS) + set_bit(index, ptp_clocks_map); + else + goto no_slot; + + /* Initialize a clock structure. */ + err = -ENOMEM; + ptp = kzalloc(sizeof(struct ptp_clock), GFP_KERNEL); + if (ptp == NULL) + goto no_memory; + + ptp->clock.ops = ptp_clock_ops; + ptp->clock.release = delete_ptp_clock; + ptp->info = info; + ptp->devid = MKDEV(major, index); + ptp->index = index; + spin_lock_init(&ptp->tsevq.lock); + mutex_init(&ptp->tsevq_mux); + init_waitqueue_head(&ptp->tsev_wq); + + /* Create a new device in our class. */ + ptp->dev = device_create(ptp_class, NULL, ptp->devid, ptp, + "ptp%d", ptp->index); + if (IS_ERR(ptp->dev)) + goto no_device; + + dev_set_drvdata(ptp->dev, ptp); + + err = ptp_populate_sysfs(ptp); + if (err) + goto no_sysfs; + + /* Register a new PPS source. */ + if (info->pps) { + struct pps_source_info pps; + memset(&pps, 0, sizeof(pps)); + snprintf(pps.name, PPS_MAX_NAME_LEN, "ptp%d", index); + pps.mode = PTP_PPS_MODE; + pps.owner = info->owner; + ptp->pps_source = pps_register_source(&pps, PTP_PPS_DEFAULTS); + if (!ptp->pps_source) { + pr_err("failed to register pps source\n"); + goto no_pps; + } + } + + /* Create a posix clock. */ + err = posix_clock_register(&ptp->clock, ptp->devid); + if (err) { + pr_err("failed to create posix clock\n"); + goto no_clock; + } + + mutex_unlock(&ptp_clocks_mutex); + return ptp; + +no_clock: + if (ptp->pps_source) + pps_unregister_source(ptp->pps_source); +no_pps: + ptp_cleanup_sysfs(ptp); +no_sysfs: + device_destroy(ptp_class, ptp->devid); +no_device: + mutex_destroy(&ptp->tsevq_mux); + kfree(ptp); +no_memory: + clear_bit(index, ptp_clocks_map); +no_slot: + mutex_unlock(&ptp_clocks_mutex); + return ERR_PTR(err); +} +EXPORT_SYMBOL(ptp_clock_register); + +int ptp_clock_unregister(struct ptp_clock *ptp) +{ + ptp->defunct = 1; + wake_up_interruptible(&ptp->tsev_wq); + + /* Release the clock's resources. */ + if (ptp->pps_source) + pps_unregister_source(ptp->pps_source); + ptp_cleanup_sysfs(ptp); + device_destroy(ptp_class, ptp->devid); + + posix_clock_unregister(&ptp->clock); + return 0; +} +EXPORT_SYMBOL(ptp_clock_unregister); + +void ptp_clock_event(struct ptp_clock *ptp, struct ptp_clock_event *event) +{ + struct pps_event_time evt; + + switch (event->type) { + + case PTP_CLOCK_ALARM: + break; + + case PTP_CLOCK_EXTTS: + enqueue_external_timestamp(&ptp->tsevq, event); + wake_up_interruptible(&ptp->tsev_wq); + break; + + case PTP_CLOCK_PPS: + pps_get_ts(&evt); + pps_event(ptp->pps_source, &evt, PTP_PPS_EVENT, NULL); + break; + } +} +EXPORT_SYMBOL(ptp_clock_event); + +/* module operations */ + +static void __exit ptp_exit(void) +{ + class_destroy(ptp_class); + unregister_chrdev_region(ptp_devt, PTP_MAX_CLOCKS); +} + +static int __init ptp_init(void) +{ + int err; + + ptp_class = class_create(THIS_MODULE, "ptp"); + if (IS_ERR(ptp_class)) { + pr_err("ptp: failed to allocate class\n"); + return PTR_ERR(ptp_class); + } + + err = alloc_chrdev_region(&ptp_devt, 0, PTP_MAX_CLOCKS, "ptp"); + if (err < 0) { + pr_err("ptp: failed to allocate device region\n"); + goto no_region; + } + + ptp_class->dev_attrs = ptp_dev_attrs; + pr_info("PTP clock support registered\n"); + return 0; + +no_region: + class_destroy(ptp_class); + return err; +} + +subsys_initcall(ptp_init); +module_exit(ptp_exit); + +MODULE_AUTHOR("Richard Cochran <richard.cochran@omicron.at>"); +MODULE_DESCRIPTION("PTP clocks support"); +MODULE_LICENSE("GPL"); diff --git a/drivers/ptp/ptp_ixp46x.c b/drivers/ptp/ptp_ixp46x.c new file mode 100644 index 000000000000..803d665b15ef --- /dev/null +++ b/drivers/ptp/ptp_ixp46x.c @@ -0,0 +1,332 @@ +/* + * PTP 1588 clock using the IXP46X + * + * Copyright (C) 2010 OMICRON electronics GmbH + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ +#include <linux/device.h> +#include <linux/err.h> +#include <linux/gpio.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/kernel.h> +#include <linux/module.h> + +#include <linux/ptp_clock_kernel.h> +#include <mach/ixp46x_ts.h> + +#define DRIVER "ptp_ixp46x" +#define N_EXT_TS 2 +#define MASTER_GPIO 8 +#define MASTER_IRQ 25 +#define SLAVE_GPIO 7 +#define SLAVE_IRQ 24 + +struct ixp_clock { + struct ixp46x_ts_regs *regs; + struct ptp_clock *ptp_clock; + struct ptp_clock_info caps; + int exts0_enabled; + int exts1_enabled; +}; + +DEFINE_SPINLOCK(register_lock); + +/* + * Register access functions + */ + +static u64 ixp_systime_read(struct ixp46x_ts_regs *regs) +{ + u64 ns; + u32 lo, hi; + + lo = __raw_readl(®s->systime_lo); + hi = __raw_readl(®s->systime_hi); + + ns = ((u64) hi) << 32; + ns |= lo; + ns <<= TICKS_NS_SHIFT; + + return ns; +} + +static void ixp_systime_write(struct ixp46x_ts_regs *regs, u64 ns) +{ + u32 hi, lo; + + ns >>= TICKS_NS_SHIFT; + hi = ns >> 32; + lo = ns & 0xffffffff; + + __raw_writel(lo, ®s->systime_lo); + __raw_writel(hi, ®s->systime_hi); +} + +/* + * Interrupt service routine + */ + +static irqreturn_t isr(int irq, void *priv) +{ + struct ixp_clock *ixp_clock = priv; + struct ixp46x_ts_regs *regs = ixp_clock->regs; + struct ptp_clock_event event; + u32 ack = 0, lo, hi, val; + + val = __raw_readl(®s->event); + + if (val & TSER_SNS) { + ack |= TSER_SNS; + if (ixp_clock->exts0_enabled) { + hi = __raw_readl(®s->asms_hi); + lo = __raw_readl(®s->asms_lo); + event.type = PTP_CLOCK_EXTTS; + event.index = 0; + event.timestamp = ((u64) hi) << 32; + event.timestamp |= lo; + event.timestamp <<= TICKS_NS_SHIFT; + ptp_clock_event(ixp_clock->ptp_clock, &event); + } + } + + if (val & TSER_SNM) { + ack |= TSER_SNM; + if (ixp_clock->exts1_enabled) { + hi = __raw_readl(®s->amms_hi); + lo = __raw_readl(®s->amms_lo); + event.type = PTP_CLOCK_EXTTS; + event.index = 1; + event.timestamp = ((u64) hi) << 32; + event.timestamp |= lo; + event.timestamp <<= TICKS_NS_SHIFT; + ptp_clock_event(ixp_clock->ptp_clock, &event); + } + } + + if (val & TTIPEND) + ack |= TTIPEND; /* this bit seems to be always set */ + + if (ack) { + __raw_writel(ack, ®s->event); + return IRQ_HANDLED; + } else + return IRQ_NONE; +} + +/* + * PTP clock operations + */ + +static int ptp_ixp_adjfreq(struct ptp_clock_info *ptp, s32 ppb) +{ + u64 adj; + u32 diff, addend; + int neg_adj = 0; + struct ixp_clock *ixp_clock = container_of(ptp, struct ixp_clock, caps); + struct ixp46x_ts_regs *regs = ixp_clock->regs; + + if (ppb < 0) { + neg_adj = 1; + ppb = -ppb; + } + addend = DEFAULT_ADDEND; + adj = addend; + adj *= ppb; + diff = div_u64(adj, 1000000000ULL); + + addend = neg_adj ? addend - diff : addend + diff; + + __raw_writel(addend, ®s->addend); + + return 0; +} + +static int ptp_ixp_adjtime(struct ptp_clock_info *ptp, s64 delta) +{ + s64 now; + unsigned long flags; + struct ixp_clock *ixp_clock = container_of(ptp, struct ixp_clock, caps); + struct ixp46x_ts_regs *regs = ixp_clock->regs; + + spin_lock_irqsave(®ister_lock, flags); + + now = ixp_systime_read(regs); + now += delta; + ixp_systime_write(regs, now); + + spin_unlock_irqrestore(®ister_lock, flags); + + return 0; +} + +static int ptp_ixp_gettime(struct ptp_clock_info *ptp, struct timespec *ts) +{ + u64 ns; + u32 remainder; + unsigned long flags; + struct ixp_clock *ixp_clock = container_of(ptp, struct ixp_clock, caps); + struct ixp46x_ts_regs *regs = ixp_clock->regs; + + spin_lock_irqsave(®ister_lock, flags); + + ns = ixp_systime_read(regs); + + spin_unlock_irqrestore(®ister_lock, flags); + + ts->tv_sec = div_u64_rem(ns, 1000000000, &remainder); + ts->tv_nsec = remainder; + return 0; +} + +static int ptp_ixp_settime(struct ptp_clock_info *ptp, + const struct timespec *ts) +{ + u64 ns; + unsigned long flags; + struct ixp_clock *ixp_clock = container_of(ptp, struct ixp_clock, caps); + struct ixp46x_ts_regs *regs = ixp_clock->regs; + + ns = ts->tv_sec * 1000000000ULL; + ns += ts->tv_nsec; + + spin_lock_irqsave(®ister_lock, flags); + + ixp_systime_write(regs, ns); + + spin_unlock_irqrestore(®ister_lock, flags); + + return 0; +} + +static int ptp_ixp_enable(struct ptp_clock_info *ptp, + struct ptp_clock_request *rq, int on) +{ + struct ixp_clock *ixp_clock = container_of(ptp, struct ixp_clock, caps); + + switch (rq->type) { + case PTP_CLK_REQ_EXTTS: + switch (rq->extts.index) { + case 0: + ixp_clock->exts0_enabled = on ? 1 : 0; + break; + case 1: + ixp_clock->exts1_enabled = on ? 1 : 0; + break; + default: + return -EINVAL; + } + return 0; + default: + break; + } + + return -EOPNOTSUPP; +} + +static struct ptp_clock_info ptp_ixp_caps = { + .owner = THIS_MODULE, + .name = "IXP46X timer", + .max_adj = 66666655, + .n_ext_ts = N_EXT_TS, + .pps = 0, + .adjfreq = ptp_ixp_adjfreq, + .adjtime = ptp_ixp_adjtime, + .gettime = ptp_ixp_gettime, + .settime = ptp_ixp_settime, + .enable = ptp_ixp_enable, +}; + +/* module operations */ + +static struct ixp_clock ixp_clock; + +static int setup_interrupt(int gpio) +{ + int irq; + + gpio_line_config(gpio, IXP4XX_GPIO_IN); + + irq = gpio_to_irq(gpio); + + if (NO_IRQ == irq) + return NO_IRQ; + + if (irq_set_irq_type(irq, IRQF_TRIGGER_FALLING)) { + pr_err("cannot set trigger type for irq %d\n", irq); + return NO_IRQ; + } + + if (request_irq(irq, isr, 0, DRIVER, &ixp_clock)) { + pr_err("request_irq failed for irq %d\n", irq); + return NO_IRQ; + } + + return irq; +} + +static void __exit ptp_ixp_exit(void) +{ + free_irq(MASTER_IRQ, &ixp_clock); + free_irq(SLAVE_IRQ, &ixp_clock); + ptp_clock_unregister(ixp_clock.ptp_clock); +} + +static int __init ptp_ixp_init(void) +{ + if (!cpu_is_ixp46x()) + return -ENODEV; + + ixp_clock.regs = + (struct ixp46x_ts_regs __iomem *) IXP4XX_TIMESYNC_BASE_VIRT; + + ixp_clock.caps = ptp_ixp_caps; + + ixp_clock.ptp_clock = ptp_clock_register(&ixp_clock.caps); + + if (IS_ERR(ixp_clock.ptp_clock)) + return PTR_ERR(ixp_clock.ptp_clock); + + __raw_writel(DEFAULT_ADDEND, &ixp_clock.regs->addend); + __raw_writel(1, &ixp_clock.regs->trgt_lo); + __raw_writel(0, &ixp_clock.regs->trgt_hi); + __raw_writel(TTIPEND, &ixp_clock.regs->event); + + if (MASTER_IRQ != setup_interrupt(MASTER_GPIO)) { + pr_err("failed to setup gpio %d as irq\n", MASTER_GPIO); + goto no_master; + } + if (SLAVE_IRQ != setup_interrupt(SLAVE_GPIO)) { + pr_err("failed to setup gpio %d as irq\n", SLAVE_GPIO); + goto no_slave; + } + + return 0; +no_slave: + free_irq(MASTER_IRQ, &ixp_clock); +no_master: + ptp_clock_unregister(ixp_clock.ptp_clock); + return -ENODEV; +} + +module_init(ptp_ixp_init); +module_exit(ptp_ixp_exit); + +MODULE_AUTHOR("Richard Cochran <richard.cochran@omicron.at>"); +MODULE_DESCRIPTION("PTP clock using the IXP46X timer"); +MODULE_LICENSE("GPL"); diff --git a/drivers/ptp/ptp_private.h b/drivers/ptp/ptp_private.h new file mode 100644 index 000000000000..4d5b5082c3b1 --- /dev/null +++ b/drivers/ptp/ptp_private.h @@ -0,0 +1,92 @@ +/* + * PTP 1588 clock support - private declarations for the core module. + * + * Copyright (C) 2010 OMICRON electronics GmbH + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ +#ifndef _PTP_PRIVATE_H_ +#define _PTP_PRIVATE_H_ + +#include <linux/cdev.h> +#include <linux/device.h> +#include <linux/mutex.h> +#include <linux/posix-clock.h> +#include <linux/ptp_clock.h> +#include <linux/ptp_clock_kernel.h> +#include <linux/time.h> + +#define PTP_MAX_TIMESTAMPS 128 +#define PTP_BUF_TIMESTAMPS 30 + +struct timestamp_event_queue { + struct ptp_extts_event buf[PTP_MAX_TIMESTAMPS]; + int head; + int tail; + spinlock_t lock; +}; + +struct ptp_clock { + struct posix_clock clock; + struct device *dev; + struct ptp_clock_info *info; + dev_t devid; + int index; /* index into clocks.map */ + struct pps_device *pps_source; + struct timestamp_event_queue tsevq; /* simple fifo for time stamps */ + struct mutex tsevq_mux; /* one process at a time reading the fifo */ + wait_queue_head_t tsev_wq; + int defunct; /* tells readers to go away when clock is being removed */ +}; + +/* + * The function queue_cnt() is safe for readers to call without + * holding q->lock. Readers use this function to verify that the queue + * is nonempty before proceeding with a dequeue operation. The fact + * that a writer might concurrently increment the tail does not + * matter, since the queue remains nonempty nonetheless. + */ +static inline int queue_cnt(struct timestamp_event_queue *q) +{ + int cnt = q->tail - q->head; + return cnt < 0 ? PTP_MAX_TIMESTAMPS + cnt : cnt; +} + +/* + * see ptp_chardev.c + */ + +long ptp_ioctl(struct posix_clock *pc, + unsigned int cmd, unsigned long arg); + +int ptp_open(struct posix_clock *pc, fmode_t fmode); + +ssize_t ptp_read(struct posix_clock *pc, + uint flags, char __user *buf, size_t cnt); + +uint ptp_poll(struct posix_clock *pc, + struct file *fp, poll_table *wait); + +/* + * see ptp_sysfs.c + */ + +extern struct device_attribute ptp_dev_attrs[]; + +int ptp_cleanup_sysfs(struct ptp_clock *ptp); + +int ptp_populate_sysfs(struct ptp_clock *ptp); + +#endif diff --git a/drivers/ptp/ptp_sysfs.c b/drivers/ptp/ptp_sysfs.c new file mode 100644 index 000000000000..2f93926ac976 --- /dev/null +++ b/drivers/ptp/ptp_sysfs.c @@ -0,0 +1,230 @@ +/* + * PTP 1588 clock support - sysfs interface. + * + * Copyright (C) 2010 OMICRON electronics GmbH + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ +#include <linux/capability.h> + +#include "ptp_private.h" + +static ssize_t clock_name_show(struct device *dev, + struct device_attribute *attr, char *page) +{ + struct ptp_clock *ptp = dev_get_drvdata(dev); + return snprintf(page, PAGE_SIZE-1, "%s\n", ptp->info->name); +} + +#define PTP_SHOW_INT(name) \ +static ssize_t name##_show(struct device *dev, \ + struct device_attribute *attr, char *page) \ +{ \ + struct ptp_clock *ptp = dev_get_drvdata(dev); \ + return snprintf(page, PAGE_SIZE-1, "%d\n", ptp->info->name); \ +} + +PTP_SHOW_INT(max_adj); +PTP_SHOW_INT(n_alarm); +PTP_SHOW_INT(n_ext_ts); +PTP_SHOW_INT(n_per_out); +PTP_SHOW_INT(pps); + +#define PTP_RO_ATTR(_var, _name) { \ + .attr = { .name = __stringify(_name), .mode = 0444 }, \ + .show = _var##_show, \ +} + +struct device_attribute ptp_dev_attrs[] = { + PTP_RO_ATTR(clock_name, clock_name), + PTP_RO_ATTR(max_adj, max_adjustment), + PTP_RO_ATTR(n_alarm, n_alarms), + PTP_RO_ATTR(n_ext_ts, n_external_timestamps), + PTP_RO_ATTR(n_per_out, n_periodic_outputs), + PTP_RO_ATTR(pps, pps_available), + __ATTR_NULL, +}; + +static ssize_t extts_enable_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ptp_clock *ptp = dev_get_drvdata(dev); + struct ptp_clock_info *ops = ptp->info; + struct ptp_clock_request req = { .type = PTP_CLK_REQ_EXTTS }; + int cnt, enable; + int err = -EINVAL; + + cnt = sscanf(buf, "%u %d", &req.extts.index, &enable); + if (cnt != 2) + goto out; + if (req.extts.index >= ops->n_ext_ts) + goto out; + + err = ops->enable(ops, &req, enable ? 1 : 0); + if (err) + goto out; + + return count; +out: + return err; +} + +static ssize_t extts_fifo_show(struct device *dev, + struct device_attribute *attr, char *page) +{ + struct ptp_clock *ptp = dev_get_drvdata(dev); + struct timestamp_event_queue *queue = &ptp->tsevq; + struct ptp_extts_event event; + unsigned long flags; + size_t qcnt; + int cnt = 0; + + memset(&event, 0, sizeof(event)); + + if (mutex_lock_interruptible(&ptp->tsevq_mux)) + return -ERESTARTSYS; + + spin_lock_irqsave(&queue->lock, flags); + qcnt = queue_cnt(queue); + if (qcnt) { + event = queue->buf[queue->head]; + queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS; + } + spin_unlock_irqrestore(&queue->lock, flags); + + if (!qcnt) + goto out; + + cnt = snprintf(page, PAGE_SIZE, "%u %lld %u\n", + event.index, event.t.sec, event.t.nsec); +out: + mutex_unlock(&ptp->tsevq_mux); + return cnt; +} + +static ssize_t period_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ptp_clock *ptp = dev_get_drvdata(dev); + struct ptp_clock_info *ops = ptp->info; + struct ptp_clock_request req = { .type = PTP_CLK_REQ_PEROUT }; + int cnt, enable, err = -EINVAL; + + cnt = sscanf(buf, "%u %lld %u %lld %u", &req.perout.index, + &req.perout.start.sec, &req.perout.start.nsec, + &req.perout.period.sec, &req.perout.period.nsec); + if (cnt != 5) + goto out; + if (req.perout.index >= ops->n_per_out) + goto out; + + enable = req.perout.period.sec || req.perout.period.nsec; + err = ops->enable(ops, &req, enable); + if (err) + goto out; + + return count; +out: + return err; +} + +static ssize_t pps_enable_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ptp_clock *ptp = dev_get_drvdata(dev); + struct ptp_clock_info *ops = ptp->info; + struct ptp_clock_request req = { .type = PTP_CLK_REQ_PPS }; + int cnt, enable; + int err = -EINVAL; + + if (!capable(CAP_SYS_TIME)) + return -EPERM; + + cnt = sscanf(buf, "%d", &enable); + if (cnt != 1) + goto out; + + err = ops->enable(ops, &req, enable ? 1 : 0); + if (err) + goto out; + + return count; +out: + return err; +} + +static DEVICE_ATTR(extts_enable, 0220, NULL, extts_enable_store); +static DEVICE_ATTR(fifo, 0444, extts_fifo_show, NULL); +static DEVICE_ATTR(period, 0220, NULL, period_store); +static DEVICE_ATTR(pps_enable, 0220, NULL, pps_enable_store); + +int ptp_cleanup_sysfs(struct ptp_clock *ptp) +{ + struct device *dev = ptp->dev; + struct ptp_clock_info *info = ptp->info; + + if (info->n_ext_ts) { + device_remove_file(dev, &dev_attr_extts_enable); + device_remove_file(dev, &dev_attr_fifo); + } + if (info->n_per_out) + device_remove_file(dev, &dev_attr_period); + + if (info->pps) + device_remove_file(dev, &dev_attr_pps_enable); + + return 0; +} + +int ptp_populate_sysfs(struct ptp_clock *ptp) +{ + struct device *dev = ptp->dev; + struct ptp_clock_info *info = ptp->info; + int err; + + if (info->n_ext_ts) { + err = device_create_file(dev, &dev_attr_extts_enable); + if (err) + goto out1; + err = device_create_file(dev, &dev_attr_fifo); + if (err) + goto out2; + } + if (info->n_per_out) { + err = device_create_file(dev, &dev_attr_period); + if (err) + goto out3; + } + if (info->pps) { + err = device_create_file(dev, &dev_attr_pps_enable); + if (err) + goto out4; + } + return 0; +out4: + if (info->n_per_out) + device_remove_file(dev, &dev_attr_period); +out3: + if (info->n_ext_ts) + device_remove_file(dev, &dev_attr_fifo); +out2: + if (info->n_ext_ts) + device_remove_file(dev, &dev_attr_extts_enable); +out1: + return err; +} |