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-		Writing Device Drivers for Zorro Devices
-		----------------------------------------
-
-Written by Geert Uytterhoeven <geert@linux-m68k.org>
-Last revised: September 5, 2003
-
-
-1. Introduction
----------------
-
-The Zorro bus is the bus used in the Amiga family of computers. Thanks to
-AutoConfig(tm), it's 100% Plug-and-Play.
-
-There are two types of Zorro busses, Zorro II and Zorro III:
-
-  - The Zorro II address space is 24-bit and lies within the first 16 MB of the
-    Amiga's address map.
-
-  - Zorro III is a 32-bit extension of Zorro II, which is backwards compatible
-    with Zorro II. The Zorro III address space lies outside the first 16 MB.
-
-
-2. Probing for Zorro Devices
-----------------------------
-
-Zorro devices are found by calling `zorro_find_device()', which returns a
-pointer to the `next' Zorro device with the specified Zorro ID. A probe loop
-for the board with Zorro ID `ZORRO_PROD_xxx' looks like:
-
-    struct zorro_dev *z = NULL;
-
-    while ((z = zorro_find_device(ZORRO_PROD_xxx, z))) {
-	if (!zorro_request_region(z->resource.start+MY_START, MY_SIZE,
-				  "My explanation"))
-	...
-    }
-
-`ZORRO_WILDCARD' acts as a wildcard and finds any Zorro device. If your driver
-supports different types of boards, you can use a construct like:
-
-    struct zorro_dev *z = NULL;
-
-    while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
-	if (z->id != ZORRO_PROD_xxx1 && z->id != ZORRO_PROD_xxx2 && ...)
-	    continue;
-	if (!zorro_request_region(z->resource.start+MY_START, MY_SIZE,
-				  "My explanation"))
-	...
-    }
-
-
-3. Zorro Resources
-------------------
-
-Before you can access a Zorro device's registers, you have to make sure it's
-not yet in use. This is done using the I/O memory space resource management
-functions:
-
-    request_mem_region()
-    release_mem_region()
-
-Shortcuts to claim the whole device's address space are provided as well:
-
-    zorro_request_device
-    zorro_release_device
-
-
-4. Accessing the Zorro Address Space
-------------------------------------
-
-The address regions in the Zorro device resources are Zorro bus address
-regions. Due to the identity bus-physical address mapping on the Zorro bus,
-they are CPU physical addresses as well.
-
-The treatment of these regions depends on the type of Zorro space:
-
-  - Zorro II address space is always mapped and does not have to be mapped
-    explicitly using z_ioremap().
-    
-    Conversion from bus/physical Zorro II addresses to kernel virtual addresses
-    and vice versa is done using:
-
-	virt_addr = ZTWO_VADDR(bus_addr);
-	bus_addr = ZTWO_PADDR(virt_addr);
-
-  - Zorro III address space must be mapped explicitly using z_ioremap() first
-    before it can be accessed:
- 
-	virt_addr = z_ioremap(bus_addr, size);
-	...
-	z_iounmap(virt_addr);
-
-
-5. References
--------------
-
-linux/include/linux/zorro.h
-linux/include/asm-{m68k,ppc}/zorro.h
-linux/include/linux/zorro_ids.h
-linux/drivers/zorro
-/proc/bus/zorro
-