-/* These flags can be used for the chip_t structure flags data entry */
-#define CHIP_CONFIGURED (1<<0)
-#define CHIP_SEGMENTED (1<<1)
-#define CHIP_IRQ_SETUP (1<<2)
+/* These flags can be used for the canchip_t structure flags data entry */
+#define CHIP_CONFIGURED (1<<0) /* chip is configured and prepared for communication */
+#define CHIP_SEGMENTED (1<<1) /* segmented access, ex: i82527 with 16 byte window*/
+#define CHIP_IRQ_SETUP (1<<2) /* IRQ handler has been set */
+#define CHIP_IRQ_PCI (1<<3) /* chip is on PCI board and uses PCI interrupt */
+#define CHIP_IRQ_VME (1<<4) /* interrupt is VME bus and requires VME bridge */
+#define CHIP_IRQ_CUSTOM (1<<5) /* custom interrupt provided by board or chip code */
+#define CHIP_IRQ_FAST (1<<6) /* interrupt handler only schedules postponed processing */
+
+#define CHIP_MAX_IRQLOOP 1000
+
+/* System independent defines of IRQ handled state */
+#define CANCHIP_IRQ_NONE 0
+#define CANCHIP_IRQ_HANDLED 1
+#define CANCHIP_IRQ_STUCK 2