Root/Documentation/scsi/hptiop.txt

1HIGHPOINT ROCKETRAID 3xxx/4xxx ADAPTER DRIVER (hptiop)
2
3Controller Register Map
4-------------------------
5
6For RR44xx Intel IOP based adapters, the controller IOP is accessed via PCI BAR0 and BAR2:
7
8     BAR0 offset Register
9            0x11C5C Link Interface IRQ Set
10            0x11C60 Link Interface IRQ Clear
11
12     BAR2 offset Register
13            0x10 Inbound Message Register 0
14            0x14 Inbound Message Register 1
15            0x18 Outbound Message Register 0
16            0x1C Outbound Message Register 1
17            0x20 Inbound Doorbell Register
18            0x24 Inbound Interrupt Status Register
19            0x28 Inbound Interrupt Mask Register
20            0x30 Outbound Interrupt Status Register
21            0x34 Outbound Interrupt Mask Register
22            0x40 Inbound Queue Port
23            0x44 Outbound Queue Port
24
25For Intel IOP based adapters, the controller IOP is accessed via PCI BAR0:
26
27     BAR0 offset Register
28            0x10 Inbound Message Register 0
29            0x14 Inbound Message Register 1
30            0x18 Outbound Message Register 0
31            0x1C Outbound Message Register 1
32            0x20 Inbound Doorbell Register
33            0x24 Inbound Interrupt Status Register
34            0x28 Inbound Interrupt Mask Register
35            0x30 Outbound Interrupt Status Register
36            0x34 Outbound Interrupt Mask Register
37            0x40 Inbound Queue Port
38            0x44 Outbound Queue Port
39
40For Marvell IOP based adapters, the IOP is accessed via PCI BAR0 and BAR1:
41
42     BAR0 offset Register
43         0x20400 Inbound Doorbell Register
44         0x20404 Inbound Interrupt Mask Register
45         0x20408 Outbound Doorbell Register
46         0x2040C Outbound Interrupt Mask Register
47
48     BAR1 offset Register
49             0x0 Inbound Queue Head Pointer
50             0x4 Inbound Queue Tail Pointer
51             0x8 Outbound Queue Head Pointer
52             0xC Outbound Queue Tail Pointer
53            0x10 Inbound Message Register
54            0x14 Outbound Message Register
55     0x40-0x1040 Inbound Queue
56   0x1040-0x2040 Outbound Queue
57
58
59I/O Request Workflow
60----------------------
61
62All queued requests are handled via inbound/outbound queue port.
63A request packet can be allocated in either IOP or host memory.
64
65To send a request to the controller:
66
67    - Get a free request packet by reading the inbound queue port or
68      allocate a free request in host DMA coherent memory.
69
70      The value returned from the inbound queue port is an offset
71      relative to the IOP BAR0.
72
73      Requests allocated in host memory must be aligned on 32-bytes boundary.
74
75    - Fill the packet.
76
77    - Post the packet to IOP by writing it to inbound queue. For requests
78      allocated in IOP memory, write the offset to inbound queue port. For
79      requests allocated in host memory, write (0x80000000|(bus_addr>>5))
80      to the inbound queue port.
81
82    - The IOP process the request. When the request is completed, it
83      will be put into outbound queue. An outbound interrupt will be
84      generated.
85
86      For requests allocated in IOP memory, the request offset is posted to
87      outbound queue.
88
89      For requests allocated in host memory, (0x80000000|(bus_addr>>5))
90      is posted to the outbound queue. If IOP_REQUEST_FLAG_OUTPUT_CONTEXT
91      flag is set in the request, the low 32-bit context value will be
92      posted instead.
93
94    - The host read the outbound queue and complete the request.
95
96      For requests allocated in IOP memory, the host driver free the request
97      by writing it to the outbound queue.
98
99Non-queued requests (reset/flush etc) can be sent via inbound message
100register 0. An outbound message with the same value indicates the completion
101of an inbound message.
102
103
104User-level Interface
105---------------------
106
107The driver exposes following sysfs attributes:
108
109     NAME R/W Description
110     driver-version R driver version string
111     firmware-version R firmware version string
112
113
114-----------------------------------------------------------------------------
115Copyright (C) 2006-2009 HighPoint Technologies, Inc. All Rights Reserved.
116
117  This file is distributed in the hope that it will be useful,
118  but WITHOUT ANY WARRANTY; without even the implied warranty of
119  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
120  GNU General Public License for more details.
121
122  linux@highpoint-tech.com
123  http://www.highpoint-tech.com
124

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