External m.d. interface points:
To config, code should configure 'gt' with a struct gtbus_attach_args
filled in. The code should have already set up the bus_space and
bus_dma tags that are passed in.
m.d. pci_chipset_tag_t should contain at least a copy of the
gtpci_chipset_tag_t data structure.
m.d. code must provide the following functions:
pci_intr_map
pci_intr_string
pci_intr_establish,
pci_intr_disestablish
void *gtmpp_intr_establish(struct gt_softc *gt, int mpp_pin, int ipl,
int (*handler)(void *), void *arg);
Add an interrupt attached to Discovery MPP pin <mpp_pin> at
the given ipl with the given handler.
void gtmpp_intr_disestablish(struct gt_softc *gt, void *cookie);
Remove an interrupt attached to Discovery MPP pin.
int gtget_macaddr(struct gt_softc *gt, int function, char *enaddr);
Get MAC for Discovery ethernet <function>
void intr_enable(void);
Enable all interrupts (disregarding spls)
void intr_disable(void);
Disable all interrupts (disregarding spls)
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