can: rcar_canfd: Add {nom,data}_bittiming variables to struct rcar_canfd_hw_info

Both R-Car Gen4 and R-Car Gen3 have different bit timing parameters
Add {nom,data}_bittiming variables to struct rcar_canfd_hw_info to
handle this difference.

Since the mask used in the macros are max value - 1, replace that
as well.

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://patch.msgid.link/20250417054320.14100-13-biju.das.jz@bp.renesas.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

1 files changed, 42 insertions, 11 deletions

diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index 5465fa897223..d8380f38cdde 100644
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -110,13 +110,13 @@
 
 /* RSCFDnCFDCmNCFG - CAN FD only */
 #define RCANFD_NCFG_NTSEG2(gpriv, x) \
-	(((x) & reg_gen4(gpriv, 0x7f, 0x1f)) << reg_gen4(gpriv, 25, 24))
+	(((x) & ((gpriv)->info->nom_bittiming->tseg2_max - 1)) << reg_gen4(gpriv, 25, 24))
 
 #define RCANFD_NCFG_NTSEG1(gpriv, x) \
-	(((x) & reg_gen4(gpriv, 0xff, 0x7f)) << reg_gen4(gpriv, 17, 16))
+	(((x) & ((gpriv)->info->nom_bittiming->tseg1_max - 1)) << reg_gen4(gpriv, 17, 16))
 
 #define RCANFD_NCFG_NSJW(gpriv, x) \
-	(((x) & reg_gen4(gpriv, 0x7f, 0x1f)) << reg_gen4(gpriv, 10, 11))
+	(((x) & ((gpriv)->info->nom_bittiming->sjw_max - 1)) << reg_gen4(gpriv, 10, 11))
 
 #define RCANFD_NCFG_NBRP(x)		(((x) & 0x3ff) << 0)
 
@@ -178,13 +178,13 @@
 #define RCANFD_CERFL_ERR(x)		((x) & (0x7fff)) /* above bits 14:0 */
 
 /* RSCFDnCFDCmDCFG */
-#define RCANFD_DCFG_DSJW(gpriv, x)	(((x) & reg_gen4(gpriv, 0xf, 0x7)) << 24)
+#define RCANFD_DCFG_DSJW(gpriv, x)	(((x) & ((gpriv)->info->data_bittiming->sjw_max - 1)) << 24)
 
 #define RCANFD_DCFG_DTSEG2(gpriv, x) \
-	(((x) & reg_gen4(gpriv, 0x0f, 0x7)) << reg_gen4(gpriv, 16, 20))
+	(((x) & ((gpriv)->info->data_bittiming->tseg2_max - 1)) << reg_gen4(gpriv, 16, 20))
 
 #define RCANFD_DCFG_DTSEG1(gpriv, x) \
-	(((x) & reg_gen4(gpriv, 0x1f, 0xf)) << reg_gen4(gpriv, 8, 16))
+	(((x) & ((gpriv)->info->data_bittiming->tseg1_max - 1)) << reg_gen4(gpriv, 8, 16))
 
 #define RCANFD_DCFG_DBRP(x)		(((x) & 0xff) << 0)
 
@@ -506,6 +506,8 @@
 struct rcar_canfd_global;
 
 struct rcar_canfd_hw_info {
+	const struct can_bittiming_const *nom_bittiming;
+	const struct can_bittiming_const *data_bittiming;
 	u8 rnc_field_width;
 	u8 max_aflpn;
 	u8 max_cftml;
@@ -546,7 +548,7 @@ struct rcar_canfd_global {
 };
 
 /* CAN FD mode nominal rate constants */
-static const struct can_bittiming_const rcar_canfd_nom_bittiming_const = {
+static const struct can_bittiming_const rcar_canfd_gen3_nom_bittiming_const = {
 	.name = RCANFD_DRV_NAME,
 	.tseg1_min = 2,
 	.tseg1_max = 128,
@@ -558,8 +560,20 @@ static const struct can_bittiming_const rcar_canfd_nom_bittiming_const = {
 	.brp_inc = 1,
 };
 
+static const struct can_bittiming_const rcar_canfd_gen4_nom_bittiming_const = {
+	.name = RCANFD_DRV_NAME,
+	.tseg1_min = 2,
+	.tseg1_max = 256,
+	.tseg2_min = 2,
+	.tseg2_max = 128,
+	.sjw_max = 128,
+	.brp_min = 1,
+	.brp_max = 1024,
+	.brp_inc = 1,
+};
+
 /* CAN FD mode data rate constants */
-static const struct can_bittiming_const rcar_canfd_data_bittiming_const = {
+static const struct can_bittiming_const rcar_canfd_gen3_data_bittiming_const = {
 	.name = RCANFD_DRV_NAME,
 	.tseg1_min = 2,
 	.tseg1_max = 16,
@@ -571,6 +585,18 @@ static const struct can_bittiming_const rcar_canfd_data_bittiming_const = {
 	.brp_inc = 1,
 };
 
+static const struct can_bittiming_const rcar_canfd_gen4_data_bittiming_const = {
+	.name = RCANFD_DRV_NAME,
+	.tseg1_min = 2,
+	.tseg1_max = 32,
+	.tseg2_min = 2,
+	.tseg2_max = 16,
+	.sjw_max = 16,
+	.brp_min = 1,
+	.brp_max = 256,
+	.brp_inc = 1,
+};
+
 /* Classical CAN mode bitrate constants */
 static const struct can_bittiming_const rcar_canfd_bittiming_const = {
 	.name = RCANFD_DRV_NAME,
@@ -585,6 +611,8 @@ static const struct can_bittiming_const rcar_canfd_bittiming_const = {
 };
 
 static const struct rcar_canfd_hw_info rcar_gen3_hw_info = {
+	.nom_bittiming = &rcar_canfd_gen3_nom_bittiming_const,
+	.data_bittiming = &rcar_canfd_gen3_data_bittiming_const,
 	.rnc_field_width = 8,
 	.max_aflpn = 31,
 	.max_cftml = 15,
@@ -594,6 +622,8 @@ static const struct rcar_canfd_hw_info rcar_gen3_hw_info = {
 };
 
 static const struct rcar_canfd_hw_info rcar_gen4_hw_info = {
+	.nom_bittiming = &rcar_canfd_gen4_nom_bittiming_const,
+	.data_bittiming = &rcar_canfd_gen4_data_bittiming_const,
 	.rnc_field_width = 16,
 	.max_aflpn = 127,
 	.max_cftml = 31,
@@ -603,6 +633,8 @@ static const struct rcar_canfd_hw_info rcar_gen4_hw_info = {
 };
 
 static const struct rcar_canfd_hw_info rzg2l_hw_info = {
+	.nom_bittiming = &rcar_canfd_gen3_nom_bittiming_const,
+	.data_bittiming = &rcar_canfd_gen3_data_bittiming_const,
 	.rnc_field_width = 8,
 	.max_aflpn = 31,
 	.max_cftml = 15,
@@ -1799,9 +1831,8 @@ static int rcar_canfd_channel_probe(struct rcar_canfd_global *gpriv, u32 ch,
 	}
 
 	if (gpriv->fdmode) {
-		priv->can.bittiming_const = &rcar_canfd_nom_bittiming_const;
-		priv->can.data_bittiming_const =
-			&rcar_canfd_data_bittiming_const;
+		priv->can.bittiming_const = gpriv->info->nom_bittiming;
+		priv->can.data_bittiming_const = gpriv->info->data_bittiming;
 
 		/* Controller starts in CAN FD only mode */
 		err = can_set_static_ctrlmode(ndev, CAN_CTRLMODE_FD);