-void m48t59_write (m48t59_t *NVRAM, uint32_t val);
-uint32_t m48t59_read (m48t59_t *NVRAM);
-void m48t59_set_addr (m48t59_t *NVRAM, uint32_t addr);
-m48t59_t *m48t59_init (int IRQ, uint32_t io_base, uint16_t size);
+void m48t59_write (m48t59_t *NVRAM, uint32_t addr, uint32_t val);
+uint32_t m48t59_read (m48t59_t *NVRAM, uint32_t addr);
+void m48t59_toggle_lock (m48t59_t *NVRAM, int lock);
+m48t59_t *m48t59_init (qemu_irq IRQ, target_ulong mem_base,
+ uint32_t io_base, uint16_t size,
+ int type);