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+HIGHPOINT ROCKETRAID 3xxx RAID DRIVER (hptiop)
+
+Controller Register Map
+-------------------------
+
+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
+
+
+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
+
+The driver registers char device "hptiop" to communicate with HighPoint RAID
+management software. Its ioctl routine acts as a general binary interface
+between the IOP firmware and HighPoint RAID management software. New management
+functions can be implemented in application/firmware without modification
+in driver code.
+
+
+-----------------------------------------------------------------------------
+Copyright (C) 2006 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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