diff --git a/include/chipdrivers/memory_bus.h b/include/chipdrivers/memory_bus.h
new file mode 100644
index 0000000..758fa64
--- /dev/null
+++ b/include/chipdrivers/memory_bus.h
@@ -0,0 +1,98 @@
+/*
+ * This file is part of the flashrom project.
+ *
+ * Copyright (C) 2009 Carl-Daniel Hailfinger
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __CHIPDRIVERS_MEMORY_BUS_H__
+#define __CHIPDRIVERS_MEMORY_BUS_H__ 1
+
+#include <stdint.h>
+
+struct flashprog_flashctx;
+
+/* 82802ab.c */
+uint8_t wait_82802ab(struct flashprog_flashctx *);
+int probe_82802ab(struct flashprog_flashctx *);
+int erase_block_82802ab(struct flashprog_flashctx *, unsigned int page, unsigned int pagesize);
+int write_82802ab(struct flashprog_flashctx *, const uint8_t *buf, unsigned int start, unsigned int len);
+void print_status_82802ab(uint8_t status);
+int unlock_28f004s5(struct flashprog_flashctx *);
+int unlock_lh28f008bjt(struct flashprog_flashctx *);
+
+/* jedec.c */
+uint8_t oddparity(uint8_t val);
+void toggle_ready_jedec(const struct flashprog_flashctx *, chipaddr dst);
+void data_polling_jedec(const struct flashprog_flashctx *, chipaddr dst, uint8_t data);
+int probe_jedec(struct flashprog_flashctx *);
+int probe_jedec_29gl(struct flashprog_flashctx *);
+int write_jedec(struct flashprog_flashctx *, const uint8_t *buf, unsigned int start, unsigned int len);
+int write_jedec_1(struct flashprog_flashctx *, const uint8_t *buf, unsigned int start, unsigned int len);
+int erase_sector_jedec(struct flashprog_flashctx *, unsigned int page, unsigned int pagesize);
+int erase_block_jedec(struct flashprog_flashctx *, unsigned int page, unsigned int blocksize);
+int erase_chip_block_jedec(struct flashprog_flashctx *, unsigned int page, unsigned int blocksize);
+
+int unlock_regspace2_uniform_32k(struct flashprog_flashctx *);
+int unlock_regspace2_uniform_64k(struct flashprog_flashctx *);
+int unlock_regspace2_block_eraser_0(struct flashprog_flashctx *);
+int unlock_regspace2_block_eraser_1(struct flashprog_flashctx *);
+int printlock_regspace2_uniform_64k(struct flashprog_flashctx *);
+int printlock_regspace2_block_eraser_0(struct flashprog_flashctx *);
+int printlock_regspace2_block_eraser_1(struct flashprog_flashctx *);
+
+/* sst28sf040.c */
+int erase_chip_28sf040(struct flashprog_flashctx *, unsigned int addr, unsigned int blocklen);
+int erase_sector_28sf040(struct flashprog_flashctx *, unsigned int address, unsigned int sector_size);
+int write_28sf040(struct flashprog_flashctx *, const uint8_t *buf, unsigned int start, unsigned int len);
+int unprotect_28sf040(struct flashprog_flashctx *);
+int protect_28sf040(struct flashprog_flashctx *);
+
+/* sst49lfxxxc.c */
+int erase_sector_49lfxxxc(struct flashprog_flashctx *, unsigned int address, unsigned int sector_size);
+
+/* sst_fwhub.c */
+int printlock_sst_fwhub(struct flashprog_flashctx *);
+int unlock_sst_fwhub(struct flashprog_flashctx *);
+
+/* w39.c */
+int printlock_w39f010(struct flashprog_flashctx *);
+int printlock_w39l010(struct flashprog_flashctx *);
+int printlock_w39l020(struct flashprog_flashctx *);
+int printlock_w39l040(struct flashprog_flashctx *);
+int printlock_w39v040a(struct flashprog_flashctx *);
+int printlock_w39v040b(struct flashprog_flashctx *);
+int printlock_w39v040c(struct flashprog_flashctx *);
+int printlock_w39v040fa(struct flashprog_flashctx *);
+int printlock_w39v040fb(struct flashprog_flashctx *);
+int printlock_w39v040fc(struct flashprog_flashctx *);
+int printlock_w39v080a(struct flashprog_flashctx *);
+int printlock_w39v080fa(struct flashprog_flashctx *);
+int printlock_w39v080fa_dual(struct flashprog_flashctx *);
+int printlock_at49f(struct flashprog_flashctx *);
+
+/* w29ee011.c */
+int probe_w29ee011(struct flashprog_flashctx *);
+
+/* stm50.c */
+int erase_sector_stm50(struct flashprog_flashctx *, unsigned int block, unsigned int blocksize);
+
+/* en29lv640b.c */
+int probe_en29lv640b(struct flashprog_flashctx *);
+int write_en29lv640b(struct flashprog_flashctx *, const uint8_t *buf, unsigned int start, unsigned int len);
+
+/* memory_bus.c */
+enum preparation_steps;
+int prepare_memory_access(struct flashprog_flashctx *, enum preparation_steps);
+int prepare_memory_register_access(struct flashprog_flashctx *, enum preparation_steps);
+void finish_memory_access(struct flashprog_flashctx *);
+
+#endif /* !__CHIPDRIVERS_MEMORY_BUS_H__ */