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[net,1/3] net: dsa: mv88e6xxx: group cycle counter coefficients

Message ID 20240929101949.723658-2-me@shenghaoyang.info (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series net: dsa: mv88e6xxx: fix MV88E6393X PHC frequency on internal clock | expand

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netdev/fixes_present success Fixes tag present in non-next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 9 this patch: 9
netdev/build_tools success No tools touched, skip
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netdev/build_clang success Errors and warnings before: 9 this patch: 9
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Commit Message

Shenghao Yang Sept. 29, 2024, 10:19 a.m. UTC 
Instead of having them as individual fields in ptp_ops, wrap the
coefficients in a separate struct so they can be referenced together.

Fixes: de776d0d316f ("net: dsa: mv88e6xxx: add support for mv88e6393x family")
Signed-off-by: Shenghao Yang <me@shenghaoyang.info>
---
 drivers/net/dsa/mv88e6xxx/chip.h |  7 ++--
 drivers/net/dsa/mv88e6xxx/ptp.c  | 57 ++++++++++++++++----------------
 2 files changed, 31 insertions(+), 33 deletions(-)

Comments

Andrew Lunn Sept. 30, 2024, 3:14 p.m. UTC | #1 
> -#define MV88E6250_CC_SHIFT	28
> -#define MV88E6250_CC_MULT	(10 << MV88E6250_CC_SHIFT)
> -#define MV88E6250_CC_MULT_NUM	(1 << 7)
> -#define MV88E6250_CC_MULT_DEM	3125ULL
> +const struct mv88e6xxx_cc_coeffs mv88e6250_cc_coeffs = {
> +	.cc_shift = 28,
> +	.cc_mult = 10 << 28,

This is slightly less readable, you loose that the 28 is the same as
cc_shift. I would suggest you keep the MV88E6250_CC_SHIFT and use it
for these two lines. Please do the same for other instances of this
structure.

	Andrew
diff mbox series

Patch

diff --git a/drivers/net/dsa/mv88e6xxx/chip.h b/drivers/net/dsa/mv88e6xxx/chip.h
index c34caf9815c5..bd66189a593f 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.h
+++ b/drivers/net/dsa/mv88e6xxx/chip.h
@@ -714,6 +714,8 @@  struct mv88e6xxx_avb_ops {
 	int (*tai_write)(struct mv88e6xxx_chip *chip, int addr, u16 data);
 };
 
+struct mv88e6xxx_cc_coeffs;
+
 struct mv88e6xxx_ptp_ops {
 	u64 (*clock_read)(const struct cyclecounter *cc);
 	int (*ptp_enable)(struct ptp_clock_info *ptp,
@@ -731,10 +733,7 @@  struct mv88e6xxx_ptp_ops {
 	int arr1_sts_reg;
 	int dep_sts_reg;
 	u32 rx_filters;
-	u32 cc_shift;
-	u32 cc_mult;
-	u32 cc_mult_num;
-	u32 cc_mult_dem;
+	const struct mv88e6xxx_cc_coeffs *cc_coeffs;
 };
 
 struct mv88e6xxx_pcs_ops {
diff --git a/drivers/net/dsa/mv88e6xxx/ptp.c b/drivers/net/dsa/mv88e6xxx/ptp.c
index 56391e09b325..89040c9af9f3 100644
--- a/drivers/net/dsa/mv88e6xxx/ptp.c
+++ b/drivers/net/dsa/mv88e6xxx/ptp.c
@@ -18,6 +18,13 @@ 
 
 #define MV88E6XXX_MAX_ADJ_PPB	1000000
 
+struct mv88e6xxx_cc_coeffs {
+	u32 cc_shift;
+	u32 cc_mult;
+	u32 cc_mult_num;
+	u32 cc_mult_dem;
+};
+
 /* Family MV88E6250:
  * Raw timestamps are in units of 10-ns clock periods.
  *
@@ -25,10 +32,12 @@ 
  * simplifies to
  * clkadj = scaled_ppm * 2^7 / 5^5
  */
-#define MV88E6250_CC_SHIFT	28
-#define MV88E6250_CC_MULT	(10 << MV88E6250_CC_SHIFT)
-#define MV88E6250_CC_MULT_NUM	(1 << 7)
-#define MV88E6250_CC_MULT_DEM	3125ULL
+const struct mv88e6xxx_cc_coeffs mv88e6250_cc_coeffs = {
+	.cc_shift = 28,
+	.cc_mult = 10 << 28,
+	.cc_mult_num = 1 << 7,
+	.cc_mult_dem = 3125ULL,
+};
 
 /* Other families:
  * Raw timestamps are in units of 8-ns clock periods.
@@ -37,10 +46,12 @@ 
  * simplifies to
  * clkadj = scaled_ppm * 2^9 / 5^6
  */
-#define MV88E6XXX_CC_SHIFT	28
-#define MV88E6XXX_CC_MULT	(8 << MV88E6XXX_CC_SHIFT)
-#define MV88E6XXX_CC_MULT_NUM	(1 << 9)
-#define MV88E6XXX_CC_MULT_DEM	15625ULL
+const struct mv88e6xxx_cc_coeffs mv88e6xxx_cc_coeffs = {
+	.cc_shift = 28,
+	.cc_mult = 8 << 28,
+	.cc_mult_num = 1 << 9,
+	.cc_mult_dem = 15625ULL
+};
 
 #define TAI_EVENT_WORK_INTERVAL msecs_to_jiffies(100)
 
@@ -214,10 +225,10 @@  static int mv88e6xxx_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
 		scaled_ppm = -scaled_ppm;
 	}
 
-	mult = ptp_ops->cc_mult;
-	adj = ptp_ops->cc_mult_num;
+	mult = ptp_ops->cc_coeffs->cc_mult;
+	adj = ptp_ops->cc_coeffs->cc_mult_num;
 	adj *= scaled_ppm;
-	diff = div_u64(adj, ptp_ops->cc_mult_dem);
+	diff = div_u64(adj, ptp_ops->cc_coeffs->cc_mult_dem);
 
 	mv88e6xxx_reg_lock(chip);
 
@@ -364,10 +375,7 @@  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_shift = MV88E6XXX_CC_SHIFT,
-	.cc_mult = MV88E6XXX_CC_MULT,
-	.cc_mult_num = MV88E6XXX_CC_MULT_NUM,
-	.cc_mult_dem = MV88E6XXX_CC_MULT_DEM,
+	.cc_coeffs = &mv88e6xxx_cc_coeffs
 };
 
 const struct mv88e6xxx_ptp_ops mv88e6250_ptp_ops = {
@@ -391,10 +399,7 @@  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_shift = MV88E6250_CC_SHIFT,
-	.cc_mult = MV88E6250_CC_MULT,
-	.cc_mult_num = MV88E6250_CC_MULT_NUM,
-	.cc_mult_dem = MV88E6250_CC_MULT_DEM,
+	.cc_coeffs = &mv88e6250_cc_coeffs,
 };
 
 const struct mv88e6xxx_ptp_ops mv88e6352_ptp_ops = {
@@ -418,10 +423,7 @@  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_shift = MV88E6XXX_CC_SHIFT,
-	.cc_mult = MV88E6XXX_CC_MULT,
-	.cc_mult_num = MV88E6XXX_CC_MULT_NUM,
-	.cc_mult_dem = MV88E6XXX_CC_MULT_DEM,
+	.cc_coeffs = &mv88e6xxx_cc_coeffs,
 };
 
 const struct mv88e6xxx_ptp_ops mv88e6390_ptp_ops = {
@@ -446,10 +448,7 @@  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_shift = MV88E6XXX_CC_SHIFT,
-	.cc_mult = MV88E6XXX_CC_MULT,
-	.cc_mult_num = MV88E6XXX_CC_MULT_NUM,
-	.cc_mult_dem = MV88E6XXX_CC_MULT_DEM,
+	.cc_coeffs = &mv88e6xxx_cc_coeffs,
 };
 
 static u64 mv88e6xxx_ptp_clock_read(const struct cyclecounter *cc)
@@ -487,8 +486,8 @@  int mv88e6xxx_ptp_setup(struct mv88e6xxx_chip *chip)
 	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_mult;
-	chip->tstamp_cc.shift	= ptp_ops->cc_shift;
+	chip->tstamp_cc.mult	= ptp_ops->cc_coeffs->cc_mult;
+	chip->tstamp_cc.shift	= ptp_ops->cc_coeffs->cc_shift;
 
 	timecounter_init(&chip->tstamp_tc, &chip->tstamp_cc,
 			 ktime_to_ns(ktime_get_real()));