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56 #ifndef _SCU_CONSTANTS_H_
57 #define _SCU_CONSTANTS_H_
60 * This file contains the SCU hardware constants.
65 #include "sci_controller_constants.h"
70 * 2 indicates the maximum number of UFs that can occur for a given IO request.
71 * The hardware handles reception of additional unsolicited frames while all
72 * UFs are in use, by holding off the transmitting device. This number could
73 * be theoretically reduced to 1, but 2 provides for more reliable operation.
74 * During SATA PIO operation, it is possible under some conditions for there to
75 * be 3 separate FISes received, back to back to back (PIO Setup, Data, D2H
76 * Register). It is unlikely to have all 3 pending all at once without some of
77 * them already being processed.
79 #define SCU_MIN_UNSOLICITED_FRAMES (1)
80 #define SCU_MIN_CRITICAL_NOTIFICATIONS (24)
81 #define SCU_MIN_EVENTS (4)
82 #define SCU_MIN_COMPLETION_QUEUE_SCRATCH (2)
83 #define SCU_MIN_COMPLETION_QUEUE_ENTRIES (SCU_MIN_CRITICAL_NOTIFICATIONS \
85 + SCU_MIN_UNSOLICITED_FRAMES \
86 + SCI_MIN_IO_REQUESTS \
87 + SCU_MIN_COMPLETION_QUEUE_SCRATCH)
89 #define SCU_MAX_CRITICAL_NOTIFICATIONS (384)
90 #define SCU_MAX_EVENTS (128)
91 #define SCU_MAX_UNSOLICITED_FRAMES (128)
92 #define SCU_MAX_COMPLETION_QUEUE_SCRATCH (128)
93 #define SCU_MAX_COMPLETION_QUEUE_ENTRIES (SCU_MAX_CRITICAL_NOTIFICATIONS \
95 + SCU_MAX_UNSOLICITED_FRAMES \
96 + SCI_MAX_IO_REQUESTS \
97 + SCU_MAX_COMPLETION_QUEUE_SCRATCH)
99 #if !defined(ENABLE_MINIMUM_MEMORY_MODE)
100 #define SCU_UNSOLICITED_FRAME_COUNT SCU_MAX_UNSOLICITED_FRAMES
101 #define SCU_CRITICAL_NOTIFICATION_COUNT SCU_MAX_CRITICAL_NOTIFICATIONS
102 #define SCU_EVENT_COUNT SCU_MAX_EVENTS
103 #define SCU_COMPLETION_QUEUE_SCRATCH SCU_MAX_COMPLETION_QUEUE_SCRATCH
104 #define SCU_IO_REQUEST_COUNT SCI_MAX_IO_REQUESTS
105 #define SCU_IO_REQUEST_SGE_COUNT SCI_MAX_SCATTER_GATHER_ELEMENTS
106 #define SCU_COMPLETION_QUEUE_COUNT SCU_MAX_COMPLETION_QUEUE_ENTRIES
108 #define SCU_UNSOLICITED_FRAME_COUNT SCU_MIN_UNSOLICITED_FRAMES
109 #define SCU_CRITICAL_NOTIFICATION_COUNT SCU_MIN_CRITICAL_NOTIFICATIONS
110 #define SCU_EVENT_COUNT SCU_MIN_EVENTS
111 #define SCU_COMPLETION_QUEUE_SCRATCH SCU_MIN_COMPLETION_QUEUE_SCRATCH
112 #define SCU_IO_REQUEST_COUNT SCI_MIN_IO_REQUESTS
113 #define SCU_IO_REQUEST_SGE_COUNT SCI_MIN_SCATTER_GATHER_ELEMENTS
114 #define SCU_COMPLETION_QUEUE_COUNT SCU_MIN_COMPLETION_QUEUE_ENTRIES
115 #endif /* !defined(ENABLE_MINIMUM_MEMORY_OPERATION) */
120 * The SCU_COMPLETION_QUEUE_COUNT constant indicates the size of the completion
121 * queue into which the hardware DMAs 32-bit quantas (completion entries).
127 * This queue must be programmed to a power of 2 size (e.g. 32, 64, 1024, etc.).
129 #if (SCU_COMPLETION_QUEUE_COUNT != 16) && \
130 (SCU_COMPLETION_QUEUE_COUNT != 32) && \
131 (SCU_COMPLETION_QUEUE_COUNT != 64) && \
132 (SCU_COMPLETION_QUEUE_COUNT != 128) && \
133 (SCU_COMPLETION_QUEUE_COUNT != 256) && \
134 (SCU_COMPLETION_QUEUE_COUNT != 512) && \
135 (SCU_COMPLETION_QUEUE_COUNT != 1024)
136 #error "SCU_COMPLETION_QUEUE_COUNT must be set to a power of 2."
139 #if SCU_MIN_UNSOLICITED_FRAMES > SCU_MAX_UNSOLICITED_FRAMES
140 #error "Invalid configuration of unsolicited frame constants"
141 #endif /* SCU_MIN_UNSOLICITED_FRAMES > SCU_MAX_UNSOLICITED_FRAMES */
143 #define SCU_MIN_UF_TABLE_ENTRIES (8)
144 #define SCU_ABSOLUTE_MAX_UNSOLICITED_FRAMES (4096)
145 #define SCU_UNSOLICITED_FRAME_BUFFER_SIZE (1024)
146 #define SCU_INVALID_FRAME_INDEX (0xFFFF)
148 #define SCU_IO_REQUEST_MAX_SGE_SIZE (0x00FFFFFF)
149 #define SCU_IO_REQUEST_MAX_TRANSFER_LENGTH (0x00FFFFFF)
151 #endif /* _SCU_CONSTANTS_H_ */