00f5970193
Most code changes were made to support adapters based on Marvell IOP, plus some other fixes. - add more PCI device IDs - support for adapters based on Marvell IOP - fix a result code translation error on big-endian systems - fix resource releasing bug when scsi_host_alloc() fail in hptiop_probe() - update scsi_cmnd.resid when finishing a request - correct some coding style issues [akpm@linux-foundation.org: type fixes] Signed-off-by: HighPoint Linux Team <linux@highpoint-tech.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
104 lines
3.7 KiB
Text
104 lines
3.7 KiB
Text
HIGHPOINT ROCKETRAID 3xxx/4xxx ADAPTER DRIVER (hptiop)
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Controller Register Map
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-------------------------
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For Intel IOP based adapters, the controller IOP is accessed via PCI BAR0:
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BAR0 offset Register
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0x10 Inbound Message Register 0
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0x14 Inbound Message Register 1
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0x18 Outbound Message Register 0
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0x1C Outbound Message Register 1
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0x20 Inbound Doorbell Register
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0x24 Inbound Interrupt Status Register
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0x28 Inbound Interrupt Mask Register
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0x30 Outbound Interrupt Status Register
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0x34 Outbound Interrupt Mask Register
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0x40 Inbound Queue Port
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0x44 Outbound Queue Port
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For Marvell IOP based adapters, the IOP is accessed via PCI BAR0 and BAR1:
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BAR0 offset Register
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0x20400 Inbound Doorbell Register
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0x20404 Inbound Interrupt Mask Register
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0x20408 Outbound Doorbell Register
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0x2040C Outbound Interrupt Mask Register
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BAR1 offset Register
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0x0 Inbound Queue Head Pointer
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0x4 Inbound Queue Tail Pointer
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0x8 Outbound Queue Head Pointer
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0xC Outbound Queue Tail Pointer
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0x10 Inbound Message Register
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0x14 Outbound Message Register
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0x40-0x1040 Inbound Queue
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0x1040-0x2040 Outbound Queue
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I/O Request Workflow
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----------------------
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All queued requests are handled via inbound/outbound queue port.
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A request packet can be allocated in either IOP or host memory.
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To send a request to the controller:
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- Get a free request packet by reading the inbound queue port or
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allocate a free request in host DMA coherent memory.
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The value returned from the inbound queue port is an offset
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relative to the IOP BAR0.
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Requests allocated in host memory must be aligned on 32-bytes boundary.
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- Fill the packet.
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- Post the packet to IOP by writing it to inbound queue. For requests
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allocated in IOP memory, write the offset to inbound queue port. For
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requests allocated in host memory, write (0x80000000|(bus_addr>>5))
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to the inbound queue port.
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- The IOP process the request. When the request is completed, it
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will be put into outbound queue. An outbound interrupt will be
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generated.
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For requests allocated in IOP memory, the request offset is posted to
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outbound queue.
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For requests allocated in host memory, (0x80000000|(bus_addr>>5))
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is posted to the outbound queue. If IOP_REQUEST_FLAG_OUTPUT_CONTEXT
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flag is set in the request, the low 32-bit context value will be
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posted instead.
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- The host read the outbound queue and complete the request.
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For requests allocated in IOP memory, the host driver free the request
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by writing it to the outbound queue.
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Non-queued requests (reset/flush etc) can be sent via inbound message
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register 0. An outbound message with the same value indicates the completion
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of an inbound message.
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User-level Interface
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---------------------
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The driver exposes following sysfs attributes:
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NAME R/W Description
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driver-version R driver version string
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firmware-version R firmware version string
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-----------------------------------------------------------------------------
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Copyright (C) 2006-2007 HighPoint Technologies, Inc. All Rights Reserved.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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linux@highpoint-tech.com
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http://www.highpoint-tech.com
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