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tg3: Enable support for timesync gpio output

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The PTP_CAPABLE tg3 devices have a gpio output that is toggled when the
free running counter matches a watchdog value. This patch adds support
to set the watchdog and enable this feature.

Since the output is controlled via bits in the EAV_REF_CLCK_CTL
register, we have to read-modify-write it when we stop/resume.

Cc: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Nithin Nayak Sujir <nsujir@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nithin Sujir
2013-07-29 13:58:38 -07:00
committed by David S. Miller
parent 4c305fa2cb
commit 92e6457d4c
2 changed files with 68 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

61
drivers/net/ethernet/broadcom/tg3.c
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@@ -6093,10 +6093,12 @@ static u64 tg3_refclk_read(struct tg3 *tp)
/* tp->lock must be held */
static void tg3_refclk_write(struct tg3 *tp, u64 newval)
{
tw32(TG3_EAV_REF_CLCK_CTL, TG3_EAV_REF_CLCK_CTL_STOP);
u32 clock_ctl = tr32(TG3_EAV_REF_CLCK_CTL);
tw32(TG3_EAV_REF_CLCK_CTL, clock_ctl | TG3_EAV_REF_CLCK_CTL_STOP);
tw32(TG3_EAV_REF_CLCK_LSB, newval & 0xffffffff);
tw32(TG3_EAV_REF_CLCK_MSB, newval >> 32);
tw32_f(TG3_EAV_REF_CLCK_CTL, TG3_EAV_REF_CLCK_CTL_RESUME);
tw32_f(TG3_EAV_REF_CLCK_CTL, clock_ctl | TG3_EAV_REF_CLCK_CTL_RESUME);
}
static inline void tg3_full_lock(struct tg3 *tp, int irq_sync);
@@ -6212,6 +6214,59 @@ static int tg3_ptp_settime(struct ptp_clock_info *ptp,
static int tg3_ptp_enable(struct ptp_clock_info *ptp,
struct ptp_clock_request *rq, int on)
{
struct tg3 *tp = container_of(ptp, struct tg3, ptp_info);
u32 clock_ctl;
int rval = 0;
switch (rq->type) {
case PTP_CLK_REQ_PEROUT:
if (rq->perout.index != 0)
return -EINVAL;
tg3_full_lock(tp, 0);
clock_ctl = tr32(TG3_EAV_REF_CLCK_CTL);
clock_ctl &= ~TG3_EAV_CTL_TSYNC_GPIO_MASK;
if (on) {
u64 nsec;
nsec = rq->perout.start.sec * 1000000000ULL +
rq->perout.start.nsec;
if (rq->perout.period.sec || rq->perout.period.nsec) {
netdev_warn(tp->dev,
"Device supports only a one-shot timesync output, period must be 0\n");
rval = -EINVAL;
goto err_out;
}
if (nsec & (1ULL << 63)) {
netdev_warn(tp->dev,
"Start value (nsec) is over limit. Maximum size of start is only 63 bits\n");
rval = -EINVAL;
goto err_out;
}
tw32(TG3_EAV_WATCHDOG0_LSB, (nsec & 0xffffffff));
tw32(TG3_EAV_WATCHDOG0_MSB,
TG3_EAV_WATCHDOG0_EN |
((nsec >> 32) & TG3_EAV_WATCHDOG_MSB_MASK));
tw32(TG3_EAV_REF_CLCK_CTL,
clock_ctl | TG3_EAV_CTL_TSYNC_WDOG0);
} else {
tw32(TG3_EAV_WATCHDOG0_MSB, 0);
tw32(TG3_EAV_REF_CLCK_CTL, clock_ctl);
}
err_out:
tg3_full_unlock(tp);
return rval;
default:
break;
}
return -EOPNOTSUPP;
}
@@ -6221,7 +6276,7 @@ static const struct ptp_clock_info tg3_ptp_caps = {
.max_adj = 250000000,
.n_alarm = 0,
.n_ext_ts = 0,
.n_per_out = 0,
.n_per_out = 1,
.pps = 0,
.adjfreq = tg3_ptp_adjfreq,
.adjtime = tg3_ptp_adjtime,