[v6,13/18] can: rcar_canfd: Add shared_can_regs variable to struct rcar_canfd_hw_info

Commit Message

Biju Das March 20, 2025, 9:10 a.m. UTC

R-Car Gen4 has shared regs for both CAN-FD and Classical CAN operations.
Add shared_can_regs variable to struct rcar_canfd_hw_info to handle this
difference.

Reviewed-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: Biju Das <[e-mail]>
---
v5->v6:
 * No change.
v4->v5:
 * Collected tag.
 * Replaced the variable name shared_can_reg->shared_can_regs.
v3->v4:
 * No change.
v3:
 * New patch.
---
 drivers/net/can/rcar/rcar_canfd.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

Patch

diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index 85542e78e3bf..360999e6ab45 100644
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -517,6 +517,7 @@  struct rcar_canfd_hw_info {
 	unsigned shared_global_irqs:1;	/* Has shared global irqs */
 	unsigned multi_channel_irqs:1;	/* Has multiple channel irqs */
 	unsigned ch_interface_mode:1;	/* Has channel interface mode */
+	unsigned shared_can_regs:1;	/* Has shared classical can registers */
 };
 
 /* Channel priv data */
@@ -636,6 +637,7 @@  static const struct rcar_canfd_hw_info rcar_gen4_hw_info = {
 	.postdiv = 2,
 	.shared_global_irqs = 1,
 	.ch_interface_mode = 1,
+	.shared_can_regs = 1,
 };
 
 static const struct rcar_canfd_hw_info rzg2l_hw_info = {
@@ -849,7 +851,7 @@  static void rcar_canfd_configure_afl_rules(struct rcar_canfd_global *gpriv,
 	/* Write number of rules for channel */
 	rcar_canfd_set_bit(gpriv->base, RCANFD_GAFLCFG(gpriv, ch),
 			   RCANFD_GAFLCFG_SETRNC(gpriv, ch, num_rules));
-	if (is_gen4(gpriv))
+	if (gpriv->info->shared_can_regs)
 		offset = RCANFD_GEN4_GAFL_OFFSET;
 	else if (gpriv->fdmode)
 		offset = RCANFD_F_GAFL_OFFSET;
@@ -1385,7 +1387,7 @@  static void rcar_canfd_set_bittiming(struct net_device *dev)
 			   brp, sjw, tseg1, tseg2);
 	} else {
 		/* Classical CAN only mode */
-		if (is_gen4(gpriv)) {
+		if (gpriv->info->shared_can_regs) {
 			cfg = (RCANFD_NCFG_NTSEG1(gpriv, tseg1) |
 			       RCANFD_NCFG_NBRP(brp) |
 			       RCANFD_NCFG_NSJW(gpriv, sjw) |
@@ -1550,7 +1552,7 @@  static netdev_tx_t rcar_canfd_start_xmit(struct sk_buff *skb,
 
 	dlc = RCANFD_CFPTR_CFDLC(can_fd_len2dlc(cf->len));
 
-	if ((priv->can.ctrlmode & CAN_CTRLMODE_FD) || is_gen4(gpriv)) {
+	if ((priv->can.ctrlmode & CAN_CTRLMODE_FD) || gpriv->info->shared_can_regs) {
 		rcar_canfd_write(priv->base,
 				 RCANFD_F_CFID(gpriv, ch, RCANFD_CFFIFO_IDX), id);
 		rcar_canfd_write(priv->base,
@@ -1609,7 +1611,7 @@  static void rcar_canfd_rx_pkt(struct rcar_canfd_channel *priv)
 	u32 ch = priv->channel;
 	u32 ridx = ch + RCANFD_RFFIFO_IDX;
 
-	if ((priv->can.ctrlmode & CAN_CTRLMODE_FD) || is_gen4(gpriv)) {
+	if ((priv->can.ctrlmode & CAN_CTRLMODE_FD) || gpriv->info->shared_can_regs) {
 		id = rcar_canfd_read(priv->base, RCANFD_F_RFID(gpriv, ridx));
 		dlc = rcar_canfd_read(priv->base, RCANFD_F_RFPTR(gpriv, ridx));
 
@@ -1660,7 +1662,7 @@  static void rcar_canfd_rx_pkt(struct rcar_canfd_channel *priv)
 		cf->len = can_cc_dlc2len(RCANFD_RFPTR_RFDLC(dlc));
 		if (id & RCANFD_RFID_RFRTR)
 			cf->can_id |= CAN_RTR_FLAG;
-		else if (is_gen4(gpriv))
+		else if (gpriv->info->shared_can_regs)
 			rcar_canfd_get_data(priv, cf, RCANFD_F_RFDF(gpriv, ridx, 0));
 		else
 			rcar_canfd_get_data(priv, cf, RCANFD_C_RFDF(ridx, 0));