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kernel-ark/Documentation/scsi/hptiop.rst
Mauro Carvalho Chehab ac69461b60 scsi: docs: convert hptiop.txt to ReST 
Link: https://lore.kernel.org/r/d189a339bb360b7b397914ee3ddeb75d9a7fd788.1583136624.git.mchehab+huawei@kernel.org
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2020-03-11 23:08:00 -04:00

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.. SPDX-License-Identifier: GPL-2.0
.. include:: <isonum.txt>
======================================================
Highpoint RocketRAID 3xxx/4xxx Adapter Driver (hptiop)
======================================================
Controller Register Map
-----------------------
For RR44xx Intel IOP based adapters, the controller IOP is accessed via PCI BAR0 and BAR2
============== ==================================
BAR0 offset Register
============== ==================================
0x11C5C Link Interface IRQ Set
0x11C60 Link Interface IRQ Clear
============== ==================================
============== ==================================
BAR2 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 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 not Frey 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
============== ==================================
For Marvell Frey IOP based adapters, the IOP is accessed via PCI BAR0 and BAR1:
============== ==================================
BAR0 offset Register
============== ==================================
0x0 IOP configuration information.
============== ==================================
============== ===================================================
BAR1 offset Register
============== ===================================================
0x4000 Inbound List Base Address Low
0x4004 Inbound List Base Address High
0x4018 Inbound List Write Pointer
0x402C Inbound List Configuration and Control
0x4050 Outbound List Base Address Low
0x4054 Outbound List Base Address High
0x4058 Outbound List Copy Pointer Shadow Base Address Low
0x405C Outbound List Copy Pointer Shadow Base Address High
0x4088 Outbound List Interrupt Cause
0x408C Outbound List Interrupt Enable
0x1020C PCIe Function 0 Interrupt Enable
0x10400 PCIe Function 0 to CPU Message A
0x10420 CPU to PCIe Function 0 Message A
0x10480 CPU to PCIe Function 0 Doorbell
0x10484 CPU to PCIe Function 0 Doorbell Enable
============== ===================================================
I/O Request Workflow of Not Marvell Frey
----------------------------------------
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.
I/O Request Workflow of Marvell Frey
------------------------------------
All queued requests are handled via inbound/outbound list.
To send a request to the controller:
- Allocate a free request in host DMA coherent memory.
Requests allocated in host memory must be aligned on 32-bytes boundary.
- Fill the request with index of the request in the flag.
Fill a free inbound list unit with the physical address and the size of
the request.
Set up the inbound list write pointer with the index of previous unit,
round to 0 if the index reaches the supported count of requests.
- Post the inbound list writer pointer to IOP.
- The IOP process the request. When the request is completed, the flag of
the request with or-ed IOPMU_QUEUE_MASK_HOST_BITS will be put into a
free outbound list unit and the index of the outbound list unit will be
put into the copy pointer shadow register. An outbound interrupt will be
generated.
- The host read the outbound list copy pointer shadow register and compare
with previous saved read pointer N. If they are different, the host will
read the (N+1)th outbound list unit.
The host get the index of the request from the (N+1)th outbound list
unit and complete the request.
Non-queued requests (reset communication/reset/flush etc) can be sent via PCIe
Function 0 to CPU Message A register. The CPU to PCIe Function 0 Message register
with the same value indicates the completion of 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 |copy| 2006-2012 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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