can: at91_can: add more register definitions

Add more register definitions found in the data sheet.

Link: https://lore.kernel.org/all/20231005-at91_can-rx_offload-v2-10-9987d53600e0@pengutronix.deSigned-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/at91_can.c

@@ -64,6 +64,8 @@ enum at91_reg {
 #define AT91_MR_DRPT BIT(7)
 
 #define AT91_SR_RBSY BIT(29)
+#define AT91_SR_TBSY BIT(30)
+#define AT91_SR_OVLSY BIT(31)
 
 #define AT91_BR_PHASE2_MASK GENMASK(2, 0)
 #define AT91_BR_PHASE1_MASK GENMASK(6, 4)
@@ -72,9 +74,13 @@ enum at91_reg {
 #define AT91_BR_BRP_MASK GENMASK(22, 16)
 #define AT91_BR_SMP BIT(24)
 
+#define AT91_TIM_TIMER_MASK GENMASK(15, 0)
+
 #define AT91_ECR_REC_MASK GENMASK(8, 0)
 #define AT91_ECR_TEC_MASK GENMASK(23, 16)
 
+#define AT91_TCR_TIMRST BIT(31)
+
 #define AT91_MMR_MTIMEMARK_MASK GENMASK(15, 0)
 #define AT91_MMR_PRIOR_MASK GENMASK(19, 16)
 #define AT91_MMR_MOT_MASK GENMASK(26, 24)