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net: dsa: mv88e6xxx: read cycle counter period from hardware

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Instead of relying on a fixed mapping of hardware family to cycle
counter frequency, pull this information from the
MV88E6XXX_TAI_CLOCK_PERIOD register.

This lets us support switches whose cycle counter frequencies depend on
board design.

Fixes: de776d0d31 ("net: dsa: mv88e6xxx: add support for mv88e6393x family")
Suggested-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Shenghao Yang <me@shenghaoyang.info>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Shenghao Yang 2024-10-20 14:38:29 +08:00 committed by Paolo Abeni
parent 67af86afff
commit 7e3c18097a
2 changed files with 43 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/dsa/mv88e6xxx/chip.h
View File

@ -409,6 +409,7 @@ struct mv88e6xxx_chip {
struct cyclecounter tstamp_cc;
struct timecounter tstamp_tc;
struct delayed_work overflow_work;
const struct mv88e6xxx_cc_coeffs *cc_coeffs;
struct ptp_clock *ptp_clock;
struct ptp_clock_info ptp_clock_info;
@ -732,7 +733,6 @@ struct mv88e6xxx_ptp_ops {
int arr1_sts_reg;
int dep_sts_reg;
u32 rx_filters;
const struct mv88e6xxx_cc_coeffs *cc_coeffs;
};
struct mv88e6xxx_pcs_ops {

60
drivers/net/dsa/mv88e6xxx/ptp.c
View File

@ -32,10 +32,10 @@ struct mv88e6xxx_cc_coeffs {
* simplifies to
* clkadj = scaled_ppm * 2^7 / 5^5
*/
#define MV88E6250_CC_SHIFT 28
static const struct mv88e6xxx_cc_coeffs mv88e6250_cc_coeffs = {
.cc_shift = MV88E6250_CC_SHIFT,
.cc_mult = 10 << MV88E6250_CC_SHIFT,
#define MV88E6XXX_CC_10NS_SHIFT 28
static const struct mv88e6xxx_cc_coeffs mv88e6xxx_cc_10ns_coeffs = {
.cc_shift = MV88E6XXX_CC_10NS_SHIFT,
.cc_mult = 10 << MV88E6XXX_CC_10NS_SHIFT,
.cc_mult_num = 1 << 7,
.cc_mult_dem = 3125ULL,
};
@ -47,10 +47,10 @@ static const struct mv88e6xxx_cc_coeffs mv88e6250_cc_coeffs = {
* simplifies to
* clkadj = scaled_ppm * 2^9 / 5^6
*/
#define MV88E6XXX_CC_SHIFT 28
static const struct mv88e6xxx_cc_coeffs mv88e6xxx_cc_coeffs = {
.cc_shift = MV88E6XXX_CC_SHIFT,
.cc_mult = 8 << MV88E6XXX_CC_SHIFT,
#define MV88E6XXX_CC_8NS_SHIFT 28
static const struct mv88e6xxx_cc_coeffs mv88e6xxx_cc_8ns_coeffs = {
.cc_shift = MV88E6XXX_CC_8NS_SHIFT,
.cc_mult = 8 << MV88E6XXX_CC_8NS_SHIFT,
.cc_mult_num = 1 << 9,
.cc_mult_dem = 15625ULL
};
@ -96,6 +96,31 @@ static int mv88e6352_set_gpio_func(struct mv88e6xxx_chip *chip, int pin,
return chip->info->ops->gpio_ops->set_pctl(chip, pin, func);
}
static const struct mv88e6xxx_cc_coeffs *
mv88e6xxx_cc_coeff_get(struct mv88e6xxx_chip *chip)
{
u16 period_ps;
int err;
err = mv88e6xxx_tai_read(chip, MV88E6XXX_TAI_CLOCK_PERIOD, &period_ps, 1);
if (err) {
dev_err(chip->dev, "failed to read cycle counter period: %d\n",
err);
return ERR_PTR(err);
}
switch (period_ps) {
case 8000:
return &mv88e6xxx_cc_8ns_coeffs;
case 10000:
return &mv88e6xxx_cc_10ns_coeffs;
default:
dev_err(chip->dev, "unexpected cycle counter period of %u ps\n",
period_ps);
return ERR_PTR(-ENODEV);
}
}
static u64 mv88e6352_ptp_clock_read(const struct cyclecounter *cc)
{
struct mv88e6xxx_chip *chip = cc_to_chip(cc);
@ -217,7 +242,6 @@ out:
static int mv88e6xxx_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
{
struct mv88e6xxx_chip *chip = ptp_to_chip(ptp);
const struct mv88e6xxx_ptp_ops *ptp_ops = chip->info->ops->ptp_ops;
int neg_adj = 0;
u32 diff, mult;
u64 adj;
@ -227,10 +251,10 @@ static int mv88e6xxx_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
scaled_ppm = -scaled_ppm;
}
mult = ptp_ops->cc_coeffs->cc_mult;
adj = ptp_ops->cc_coeffs->cc_mult_num;
mult = chip->cc_coeffs->cc_mult;
adj = chip->cc_coeffs->cc_mult_num;
adj *= scaled_ppm;
diff = div_u64(adj, ptp_ops->cc_coeffs->cc_mult_dem);
diff = div_u64(adj, chip->cc_coeffs->cc_mult_dem);
mv88e6xxx_reg_lock(chip);
@ -377,7 +401,6 @@ const struct mv88e6xxx_ptp_ops mv88e6165_ptp_ops = {
(1 << HWTSTAMP_FILTER_PTP_V2_EVENT) |
(1 << HWTSTAMP_FILTER_PTP_V2_SYNC) |
(1 << HWTSTAMP_FILTER_PTP_V2_DELAY_REQ),
.cc_coeffs = &mv88e6xxx_cc_coeffs
};
const struct mv88e6xxx_ptp_ops mv88e6250_ptp_ops = {
@ -401,7 +424,6 @@ const struct mv88e6xxx_ptp_ops mv88e6250_ptp_ops = {
(1 << HWTSTAMP_FILTER_PTP_V2_EVENT) |
(1 << HWTSTAMP_FILTER_PTP_V2_SYNC) |
(1 << HWTSTAMP_FILTER_PTP_V2_DELAY_REQ),
.cc_coeffs = &mv88e6250_cc_coeffs,
};
const struct mv88e6xxx_ptp_ops mv88e6352_ptp_ops = {
@ -425,7 +447,6 @@ const struct mv88e6xxx_ptp_ops mv88e6352_ptp_ops = {
(1 << HWTSTAMP_FILTER_PTP_V2_EVENT) |
(1 << HWTSTAMP_FILTER_PTP_V2_SYNC) |
(1 << HWTSTAMP_FILTER_PTP_V2_DELAY_REQ),
.cc_coeffs = &mv88e6xxx_cc_coeffs,
};
const struct mv88e6xxx_ptp_ops mv88e6390_ptp_ops = {
@ -450,7 +471,6 @@ const struct mv88e6xxx_ptp_ops mv88e6390_ptp_ops = {
(1 << HWTSTAMP_FILTER_PTP_V2_EVENT) |
(1 << HWTSTAMP_FILTER_PTP_V2_SYNC) |
(1 << HWTSTAMP_FILTER_PTP_V2_DELAY_REQ),
.cc_coeffs = &mv88e6xxx_cc_coeffs,
};
static u64 mv88e6xxx_ptp_clock_read(const struct cyclecounter *cc)
@ -485,11 +505,15 @@ int mv88e6xxx_ptp_setup(struct mv88e6xxx_chip *chip)
int i;
/* Set up the cycle counter */
chip->cc_coeffs = mv88e6xxx_cc_coeff_get(chip);
if (IS_ERR(chip->cc_coeffs))
return PTR_ERR(chip->cc_coeffs);
memset(&chip->tstamp_cc, 0, sizeof(chip->tstamp_cc));
chip->tstamp_cc.read = mv88e6xxx_ptp_clock_read;
chip->tstamp_cc.mask = CYCLECOUNTER_MASK(32);
chip->tstamp_cc.mult = ptp_ops->cc_coeffs->cc_mult;
chip->tstamp_cc.shift = ptp_ops->cc_coeffs->cc_shift;
chip->tstamp_cc.mult = chip->cc_coeffs->cc_mult;
chip->tstamp_cc.shift = chip->cc_coeffs->cc_shift;
timecounter_init(&chip->tstamp_tc, &chip->tstamp_cc,
ktime_to_ns(ktime_get_real()));