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linux/drivers/net/gianfar_ptp.c

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/*
* PTP 1588 clock using the eTSEC
*
* 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/hrtimer.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/timex.h>
#include <linux/io.h>
#include <linux/ptp_clock_kernel.h>
#include "gianfar.h"
/*
* gianfar ptp registers
* Generated by regen.tcl on Thu May 13 01:38:57 PM CEST 2010
*/
struct gianfar_ptp_registers {
u32 tmr_ctrl; /* Timer control register */
u32 tmr_tevent; /* Timestamp event register */
u32 tmr_temask; /* Timer event mask register */
u32 tmr_pevent; /* Timestamp event register */
u32 tmr_pemask; /* Timer event mask register */
u32 tmr_stat; /* Timestamp status register */
u32 tmr_cnt_h; /* Timer counter high register */
u32 tmr_cnt_l; /* Timer counter low register */
u32 tmr_add; /* Timer drift compensation addend register */
u32 tmr_acc; /* Timer accumulator register */
u32 tmr_prsc; /* Timer prescale */
u8 res1[4];
u32 tmroff_h; /* Timer offset high */
u32 tmroff_l; /* Timer offset low */
u8 res2[8];
u32 tmr_alarm1_h; /* Timer alarm 1 high register */
u32 tmr_alarm1_l; /* Timer alarm 1 high register */
u32 tmr_alarm2_h; /* Timer alarm 2 high register */
u32 tmr_alarm2_l; /* Timer alarm 2 high register */
u8 res3[48];
u32 tmr_fiper1; /* Timer fixed period interval */
u32 tmr_fiper2; /* Timer fixed period interval */
u32 tmr_fiper3; /* Timer fixed period interval */
u8 res4[20];
u32 tmr_etts1_h; /* Timestamp of general purpose external trigger */
u32 tmr_etts1_l; /* Timestamp of general purpose external trigger */
u32 tmr_etts2_h; /* Timestamp of general purpose external trigger */
u32 tmr_etts2_l; /* Timestamp of general purpose external trigger */
};
/* Bit definitions for the TMR_CTRL register */
#define ALM1P (1<<31) /* Alarm1 output polarity */
#define ALM2P (1<<30) /* Alarm2 output polarity */
#define FS (1<<28) /* FIPER start indication */
#define PP1L (1<<27) /* Fiper1 pulse loopback mode enabled. */
#define PP2L (1<<26) /* Fiper2 pulse loopback mode enabled. */
#define TCLK_PERIOD_SHIFT (16) /* 1588 timer reference clock period. */
#define TCLK_PERIOD_MASK (0x3ff)
#define RTPE (1<<15) /* Record Tx Timestamp to PAL Enable. */
#define FRD (1<<14) /* FIPER Realignment Disable */
#define ESFDP (1<<11) /* External Tx/Rx SFD Polarity. */
#define ESFDE (1<<10) /* External Tx/Rx SFD Enable. */
#define ETEP2 (1<<9) /* External trigger 2 edge polarity */
#define ETEP1 (1<<8) /* External trigger 1 edge polarity */
#define COPH (1<<7) /* Generated clock output phase. */
#define CIPH (1<<6) /* External oscillator input clock phase */
#define TMSR (1<<5) /* Timer soft reset. */
#define BYP (1<<3) /* Bypass drift compensated clock */
#define TE (1<<2) /* 1588 timer enable. */
#define CKSEL_SHIFT (0) /* 1588 Timer reference clock source */
#define CKSEL_MASK (0x3)
/* Bit definitions for the TMR_TEVENT register */
#define ETS2 (1<<25) /* External trigger 2 timestamp sampled */
#define ETS1 (1<<24) /* External trigger 1 timestamp sampled */
#define ALM2 (1<<17) /* Current time = alarm time register 2 */
#define ALM1 (1<<16) /* Current time = alarm time register 1 */
#define PP1 (1<<7) /* periodic pulse generated on FIPER1 */
#define PP2 (1<<6) /* periodic pulse generated on FIPER2 */
#define PP3 (1<<5) /* periodic pulse generated on FIPER3 */
/* Bit definitions for the TMR_TEMASK register */
#define ETS2EN (1<<25) /* External trigger 2 timestamp enable */
#define ETS1EN (1<<24) /* External trigger 1 timestamp enable */
#define ALM2EN (1<<17) /* Timer ALM2 event enable */
#define ALM1EN (1<<16) /* Timer ALM1 event enable */
#define PP1EN (1<<7) /* Periodic pulse event 1 enable */
#define PP2EN (1<<6) /* Periodic pulse event 2 enable */
/* Bit definitions for the TMR_PEVENT register */
#define TXP2 (1<<9) /* PTP transmitted timestamp im TXTS2 */
#define TXP1 (1<<8) /* PTP transmitted timestamp in TXTS1 */
#define RXP (1<<0) /* PTP frame has been received */
/* Bit definitions for the TMR_PEMASK register */
#define TXP2EN (1<<9) /* Transmit PTP packet event 2 enable */
#define TXP1EN (1<<8) /* Transmit PTP packet event 1 enable */
#define RXPEN (1<<0) /* Receive PTP packet event enable */
/* Bit definitions for the TMR_STAT register */
#define STAT_VEC_SHIFT (0) /* Timer general purpose status vector */
#define STAT_VEC_MASK (0x3f)
/* Bit definitions for the TMR_PRSC register */
#define PRSC_OCK_SHIFT (0) /* Output clock division/prescale factor. */
#define PRSC_OCK_MASK (0xffff)
#define DRIVER "gianfar_ptp"
#define DEFAULT_CKSEL 1
#define N_ALARM 1 /* first alarm is used internally to reset fipers */
#define N_EXT_TS 2
#define REG_SIZE sizeof(struct gianfar_ptp_registers)
struct etsects {
struct gianfar_ptp_registers *regs;
spinlock_t lock; /* protects regs */
struct ptp_clock *clock;
struct ptp_clock_info caps;
struct resource *rsrc;
int irq;
u64 alarm_interval; /* for periodic alarm */
u64 alarm_value;
u32 tclk_period; /* nanoseconds */
u32 tmr_prsc;
u32 tmr_add;
u32 cksel;
u32 tmr_fiper1;
u32 tmr_fiper2;
};
/*
* Register access functions
*/
/* Caller must hold etsects->lock. */
static u64 tmr_cnt_read(struct etsects *etsects)
{
u64 ns;
u32 lo, hi;
lo = gfar_read(&etsects->regs->tmr_cnt_l);
hi = gfar_read(&etsects->regs->tmr_cnt_h);
ns = ((u64) hi) << 32;
ns |= lo;
return ns;
}
/* Caller must hold etsects->lock. */
static void tmr_cnt_write(struct etsects *etsects, u64 ns)
{
u32 hi = ns >> 32;
u32 lo = ns & 0xffffffff;
gfar_write(&etsects->regs->tmr_cnt_l, lo);
gfar_write(&etsects->regs->tmr_cnt_h, hi);
}
/* Caller must hold etsects->lock. */
static void set_alarm(struct etsects *etsects)
{
u64 ns;
u32 lo, hi;
ns = tmr_cnt_read(etsects) + 1500000000ULL;
ns = div_u64(ns, 1000000000UL) * 1000000000ULL;
ns -= etsects->tclk_period;
hi = ns >> 32;
lo = ns & 0xffffffff;
gfar_write(&etsects->regs->tmr_alarm1_l, lo);
gfar_write(&etsects->regs->tmr_alarm1_h, hi);
}
/* Caller must hold etsects->lock. */
static void set_fipers(struct etsects *etsects)
{
set_alarm(etsects);
gfar_write(&etsects->regs->tmr_fiper1, etsects->tmr_fiper1);
gfar_write(&etsects->regs->tmr_fiper2, etsects->tmr_fiper2);
}
/*
* Interrupt service routine
*/
static irqreturn_t isr(int irq, void *priv)
{
struct etsects *etsects = priv;
struct ptp_clock_event event;
u64 ns;
u32 ack = 0, lo, hi, mask, val;
val = gfar_read(&etsects->regs->tmr_tevent);
if (val & ETS1) {
ack |= ETS1;
hi = gfar_read(&etsects->regs->tmr_etts1_h);
lo = gfar_read(&etsects->regs->tmr_etts1_l);
event.type = PTP_CLOCK_EXTTS;
event.index = 0;
event.timestamp = ((u64) hi) << 32;
event.timestamp |= lo;
ptp_clock_event(etsects->clock, &event);
}
if (val & ETS2) {
ack |= ETS2;
hi = gfar_read(&etsects->regs->tmr_etts2_h);
lo = gfar_read(&etsects->regs->tmr_etts2_l);
event.type = PTP_CLOCK_EXTTS;
event.index = 1;
event.timestamp = ((u64) hi) << 32;
event.timestamp |= lo;
ptp_clock_event(etsects->clock, &event);
}
if (val & ALM2) {
ack |= ALM2;
if (etsects->alarm_value) {
event.type = PTP_CLOCK_ALARM;
event.index = 0;
event.timestamp = etsects->alarm_value;
ptp_clock_event(etsects->clock, &event);
}
if (etsects->alarm_interval) {
ns = etsects->alarm_value + etsects->alarm_interval;
hi = ns >> 32;
lo = ns & 0xffffffff;
spin_lock(&etsects->lock);
gfar_write(&etsects->regs->tmr_alarm2_l, lo);
gfar_write(&etsects->regs->tmr_alarm2_h, hi);
spin_unlock(&etsects->lock);
etsects->alarm_value = ns;
} else {
gfar_write(&etsects->regs->tmr_tevent, ALM2);
spin_lock(&etsects->lock);
mask = gfar_read(&etsects->regs->tmr_temask);
mask &= ~ALM2EN;
gfar_write(&etsects->regs->tmr_temask, mask);
spin_unlock(&etsects->lock);
etsects->alarm_value = 0;
etsects->alarm_interval = 0;
}
}
if (val & PP1) {
ack |= PP1;
event.type = PTP_CLOCK_PPS;
ptp_clock_event(etsects->clock, &event);
}
if (ack) {
gfar_write(&etsects->regs->tmr_tevent, ack);
return IRQ_HANDLED;
} else
return IRQ_NONE;
}
/*
* PTP clock operations
*/
static int ptp_gianfar_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
{
u64 adj;
u32 diff, tmr_add;
int neg_adj = 0;
struct etsects *etsects = container_of(ptp, struct etsects, caps);
if (ppb < 0) {
neg_adj = 1;
ppb = -ppb;
}
tmr_add = etsects->tmr_add;
adj = tmr_add;
adj *= ppb;
diff = div_u64(adj, 1000000000ULL);
tmr_add = neg_adj ? tmr_add - diff : tmr_add + diff;
gfar_write(&etsects->regs->tmr_add, tmr_add);
return 0;
}
static int ptp_gianfar_adjtime(struct ptp_clock_info *ptp, s64 delta)
{
s64 now;
unsigned long flags;
struct etsects *etsects = container_of(ptp, struct etsects, caps);
spin_lock_irqsave(&etsects->lock, flags);
now = tmr_cnt_read(etsects);
now += delta;
tmr_cnt_write(etsects, now);
spin_unlock_irqrestore(&etsects->lock, flags);
set_fipers(etsects);
return 0;
}
static int ptp_gianfar_gettime(struct ptp_clock_info *ptp, struct timespec *ts)
{
u64 ns;
u32 remainder;
unsigned long flags;
struct etsects *etsects = container_of(ptp, struct etsects, caps);
spin_lock_irqsave(&etsects->lock, flags);
ns = tmr_cnt_read(etsects);
spin_unlock_irqrestore(&etsects->lock, flags);
ts->tv_sec = div_u64_rem(ns, 1000000000, &remainder);
ts->tv_nsec = remainder;
return 0;
}
static int ptp_gianfar_settime(struct ptp_clock_info *ptp,
const struct timespec *ts)
{
u64 ns;
unsigned long flags;
struct etsects *etsects = container_of(ptp, struct etsects, caps);
ns = ts->tv_sec * 1000000000ULL;
ns += ts->tv_nsec;
spin_lock_irqsave(&etsects->lock, flags);
tmr_cnt_write(etsects, ns);
set_fipers(etsects);
spin_unlock_irqrestore(&etsects->lock, flags);
return 0;
}
static int ptp_gianfar_enable(struct ptp_clock_info *ptp,
struct ptp_clock_request *rq, int on)
{
struct etsects *etsects = container_of(ptp, struct etsects, caps);
unsigned long flags;
u32 bit, mask;
switch (rq->type) {
case PTP_CLK_REQ_EXTTS:
switch (rq->extts.index) {
case 0:
bit = ETS1EN;
break;
case 1:
bit = ETS2EN;
break;
default:
return -EINVAL;
}
spin_lock_irqsave(&etsects->lock, flags);
mask = gfar_read(&etsects->regs->tmr_temask);
if (on)
mask |= bit;
else
mask &= ~bit;
gfar_write(&etsects->regs->tmr_temask, mask);
spin_unlock_irqrestore(&etsects->lock, flags);
return 0;
case PTP_CLK_REQ_PPS:
spin_lock_irqsave(&etsects->lock, flags);
mask = gfar_read(&etsects->regs->tmr_temask);
if (on)
mask |= PP1EN;
else
mask &= ~PP1EN;
gfar_write(&etsects->regs->tmr_temask, mask);
spin_unlock_irqrestore(&etsects->lock, flags);
return 0;
default:
break;
}
return -EOPNOTSUPP;
}
static struct ptp_clock_info ptp_gianfar_caps = {
.owner = THIS_MODULE,
.name = "gianfar clock",
.max_adj = 512000,
.n_alarm = N_ALARM,
.n_ext_ts = N_EXT_TS,
.n_per_out = 0,
.pps = 1,
.adjfreq = ptp_gianfar_adjfreq,
.adjtime = ptp_gianfar_adjtime,
.gettime = ptp_gianfar_gettime,
.settime = ptp_gianfar_settime,
.enable = ptp_gianfar_enable,
};
/* OF device tree */
static int get_of_u32(struct device_node *node, char *str, u32 *val)
{
int plen;
const u32 *prop = of_get_property(node, str, &plen);
if (!prop || plen != sizeof(*prop))
return -1;
*val = *prop;
return 0;
}
static int gianfar_ptp_probe(struct platform_device *dev)
{
struct device_node *node = dev->dev.of_node;
struct etsects *etsects;
struct timespec now;
int err = -ENOMEM;
u32 tmr_ctrl;
unsigned long flags;
etsects = kzalloc(sizeof(*etsects), GFP_KERNEL);
if (!etsects)
goto no_memory;
err = -ENODEV;
etsects->caps = ptp_gianfar_caps;
etsects->cksel = DEFAULT_CKSEL;
if (get_of_u32(node, "fsl,tclk-period", &etsects->tclk_period) ||
get_of_u32(node, "fsl,tmr-prsc", &etsects->tmr_prsc) ||
get_of_u32(node, "fsl,tmr-add", &etsects->tmr_add) ||
get_of_u32(node, "fsl,tmr-fiper1", &etsects->tmr_fiper1) ||
get_of_u32(node, "fsl,tmr-fiper2", &etsects->tmr_fiper2) ||
get_of_u32(node, "fsl,max-adj", &etsects->caps.max_adj)) {
pr_err("device tree node missing required elements\n");
goto no_node;
}
etsects->irq = platform_get_irq(dev, 0);
if (etsects->irq == NO_IRQ) {
pr_err("irq not in device tree\n");
goto no_node;
}
if (request_irq(etsects->irq, isr, 0, DRIVER, etsects)) {
pr_err("request_irq failed\n");
goto no_node;
}
etsects->rsrc = platform_get_resource(dev, IORESOURCE_MEM, 0);
if (!etsects->rsrc) {
pr_err("no resource\n");
goto no_resource;
}
if (request_resource(&ioport_resource, etsects->rsrc)) {
pr_err("resource busy\n");
goto no_resource;
}
spin_lock_init(&etsects->lock);
etsects->regs = ioremap(etsects->rsrc->start,
resource_size(etsects->rsrc));
if (!etsects->regs) {
pr_err("ioremap ptp registers failed\n");
goto no_ioremap;
}
getnstimeofday(&now);
ptp_gianfar_settime(&etsects->caps, &now);
tmr_ctrl =
(etsects->tclk_period & TCLK_PERIOD_MASK) << TCLK_PERIOD_SHIFT |
(etsects->cksel & CKSEL_MASK) << CKSEL_SHIFT;
spin_lock_irqsave(&etsects->lock, flags);
gfar_write(&etsects->regs->tmr_ctrl, tmr_ctrl);
gfar_write(&etsects->regs->tmr_add, etsects->tmr_add);
gfar_write(&etsects->regs->tmr_prsc, etsects->tmr_prsc);
gfar_write(&etsects->regs->tmr_fiper1, etsects->tmr_fiper1);
gfar_write(&etsects->regs->tmr_fiper2, etsects->tmr_fiper2);
set_alarm(etsects);
gfar_write(&etsects->regs->tmr_ctrl, tmr_ctrl|FS|RTPE|TE|FRD);
spin_unlock_irqrestore(&etsects->lock, flags);
etsects->clock = ptp_clock_register(&etsects->caps);
if (IS_ERR(etsects->clock)) {
err = PTR_ERR(etsects->clock);
goto no_clock;
}
dev_set_drvdata(&dev->dev, etsects);
return 0;
no_clock:
no_ioremap:
release_resource(etsects->rsrc);
no_resource:
free_irq(etsects->irq, etsects);
no_node:
kfree(etsects);
no_memory:
return err;
}
static int gianfar_ptp_remove(struct platform_device *dev)
{
struct etsects *etsects = dev_get_drvdata(&dev->dev);
gfar_write(&etsects->regs->tmr_temask, 0);
gfar_write(&etsects->regs->tmr_ctrl, 0);
ptp_clock_unregister(etsects->clock);
iounmap(etsects->regs);
release_resource(etsects->rsrc);
free_irq(etsects->irq, etsects);
kfree(etsects);
return 0;
}
static struct of_device_id match_table[] = {
{ .compatible = "fsl,etsec-ptp" },
{},
};
static struct platform_driver gianfar_ptp_driver = {
.driver = {
.name = "gianfar_ptp",
.of_match_table = match_table,
.owner = THIS_MODULE,
},
.probe = gianfar_ptp_probe,
.remove = gianfar_ptp_remove,
};
/* module operations */
static int __init ptp_gianfar_init(void)
{
return platform_driver_register(&gianfar_ptp_driver);
}
module_init(ptp_gianfar_init);
static void __exit ptp_gianfar_exit(void)
{
platform_driver_unregister(&gianfar_ptp_driver);
}
module_exit(ptp_gianfar_exit);
MODULE_AUTHOR("Richard Cochran <richard.cochran@omicron.at>");
MODULE_DESCRIPTION("PTP clock using the eTSEC");
MODULE_LICENSE("GPL");
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