diff options
author | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2019-06-27 15:39:22 -0300 |
---|---|---|
committer | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2019-07-15 11:03:02 -0300 |
commit | baa293e9544bea71361950d071579f0e4d5713ed (patch) | |
tree | 29e0400c806016783a3fd7a380be40a201956653 /Documentation/zorro.txt | |
parent | 4f4cfa6c560c93ba180c30675cf845e1597de44c (diff) | |
download | linux-baa293e9544bea71361950d071579f0e4d5713ed.tar.bz2 |
docs: driver-api: add a series of orphaned documents
There are lots of documents under Documentation/*.txt and a few other
orphan documents elsehwere that belong to the driver-API book.
Move them to their right place.
Reviewed-by: Cornelia Huck <cohuck@redhat.com> # vfio-related parts
Acked-by: Logan Gunthorpe <logang@deltatee.com> # switchtec
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Diffstat (limited to 'Documentation/zorro.txt')
-rw-r--r-- | Documentation/zorro.txt | 104 |
1 files changed, 0 insertions, 104 deletions
diff --git a/Documentation/zorro.txt b/Documentation/zorro.txt deleted file mode 100644 index 664072b017e3..000000000000 --- a/Documentation/zorro.txt +++ /dev/null @@ -1,104 +0,0 @@ -======================================== -Writing Device Drivers for Zorro Devices -======================================== - -:Author: Written by Geert Uytterhoeven <geert@linux-m68k.org> -:Last revised: September 5, 2003 - - -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 buses, 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. - - -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")) - ... - } - - -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 - - -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); - - -References ----------- - -#. linux/include/linux/zorro.h -#. linux/include/uapi/linux/zorro.h -#. linux/include/uapi/linux/zorro_ids.h -#. linux/arch/m68k/include/asm/zorro.h -#. linux/drivers/zorro -#. /proc/bus/zorro - |