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HIGHPOINT ROCKETRAID 3xxx/4xxx ADAPTER DRIVER (hptiop)
Controller Register Map
-------------------------
For Intel IOP based adapters, the controller IOP is accessed via PCI BAR0:
BAR0 offset Register
0x10 Inbound Message Register 0
0x14 Inbound Message Register 1
0x18 Outbound Message Register 0
0x1C Outbound Message Register 1
0x20 Inbound Doorbell Register
0x24 Inbound Interrupt Status Register
0x28 Inbound Interrupt Mask Register
0x30 Outbound Interrupt Status Register
0x34 Outbound Interrupt Mask Register
0x40 Inbound Queue Port
0x44 Outbound Queue Port
For Marvell IOP based adapters, the IOP is accessed via PCI BAR0 and BAR1:
BAR0 offset Register
0x20400 Inbound Doorbell Register
0x20404 Inbound Interrupt Mask Register
0x20408 Outbound Doorbell Register
0x2040C Outbound Interrupt Mask Register
BAR1 offset Register
0x0 Inbound Queue Head Pointer
0x4 Inbound Queue Tail Pointer
0x8 Outbound Queue Head Pointer
0xC Outbound Queue Tail Pointer
0x10 Inbound Message Register
0x14 Outbound Message Register
0x40-0x1040 Inbound Queue
0x1040-0x2040 Outbound Queue
I/O Request Workflow
----------------------
All queued requests are handled via inbound/outbound queue port.
A request packet can be allocated in either IOP or host memory.
To send a request to the controller:
- Get a free request packet by reading the inbound queue port or
allocate a free request in host DMA coherent memory.
The value returned from the inbound queue port is an offset
relative to the IOP BAR0.
Requests allocated in host memory must be aligned on 32-bytes boundary.
- Fill the packet.
- Post the packet to IOP by writing it to inbound queue. For requests
allocated in IOP memory, write the offset to inbound queue port. For
requests allocated in host memory, write (0x80000000|(bus_addr>>5))
to the inbound queue port.
- The IOP process the request. When the request is completed, it
will be put into outbound queue. An outbound interrupt will be
generated.
For requests allocated in IOP memory, the request offset is posted to
outbound queue.
For requests allocated in host memory, (0x80000000|(bus_addr>>5))
is posted to the outbound queue. If IOP_REQUEST_FLAG_OUTPUT_CONTEXT
flag is set in the request, the low 32-bit context value will be
posted instead.
- The host read the outbound queue and complete the request.
For requests allocated in IOP memory, the host driver free the request
by writing it to the outbound queue.
Non-queued requests (reset/flush etc) can be sent via inbound message
register 0. An outbound message with the same value indicates the completion
of an inbound message.
User-level Interface
---------------------
The driver exposes following sysfs attributes:
NAME R/W Description
driver-version R driver version string
firmware-version R firmware version string
-----------------------------------------------------------------------------
Copyright (C) 2006-2007 HighPoint Technologies, Inc. All Rights Reserved.
This file 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.
linux@highpoint-tech.com
http://www.highpoint-tech.com
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