[SCSI] hptiop: HighPoint RocketRAID 3xxx controller driver
HighPoint RocketRAID 3220/3320 series 8 channel PCI-X SATA RAID Host
Adapters.
Fixes from original submission:
Merge Andrew Morton's patches:
- Provide locking for global list
- Fix debug printks
- uninline function with multiple callsites
- coding style fixups
- remove unneeded casts of void*
- kfree(NULL) is legal
- Don't "succeed" if register_chrdev() failed - otherwise we'll later
unregister a not-registered chrdev.
- Don't return from hptiop_do_ioctl() with the spinlock held.
- uninline __hpt_do_ioctl()
Update for Arjan van de Ven's comments:
- put all asm/ includes after the linux/ ones
- replace mdelay with msleep
- add pci posting flush
- do not set pci command reqister in map_pci_bar
- do not try merging sg elements in hptiop_buildsgl()
- remove unused outstandingcommands member from hba structure
- remove unimplemented hptiop_abort() handler
- remove typedef u32 hpt_id_t
Other updates:
- fix endianess
Signed-off-by: HighPoint Linux Team <linux@highpoint-tech.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/Documentation/scsi/hptiop.txt b/Documentation/scsi/hptiop.txt
new file mode 100644
index 0000000..d28a312
--- /dev/null
+++ b/Documentation/scsi/hptiop.txt
@@ -0,0 +1,92 @@
+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